STERLING CHEMICALS INC
PRE13E3/A, 1996-07-05
INDUSTRIAL ORGANIC CHEMICALS
Previous: STERLING CHEMICALS INC, PRER14A, 1996-07-05
Next: DREYFUS TREASURY CASH MANAGEMENT, 497, 1996-07-05



<PAGE>
 
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                -----------------  

                                 SCHEDULE 13E-3
                        RULE 13E-3 TRANSACTION STATEMENT
       (PURSUANT TO SECTION 13(E) OF THE SECURITIES EXCHANGE ACT OF 1934)
                                        
                            STERLING CHEMICALS, INC.
                              (NAME OF THE ISSUER)

                            STERLING CHEMICALS, INC.
                            THE STERLING GROUP, INC.
                             STX ACQUISITION CORP.
    
                                GORDON A. CAIN
                               WILLIAM A. MCMINN     
                      (NAME OF PERSON(S) FILING STATEMENT)

  COMMON STOCK, PAR VALUE $.01 PER SHARE ("COMMON STOCK"), OF THE REGISTRANT
                         (TITLE OF CLASS OF SECURITIES)
                                        
                           ------------------------

                                  858903-10-7

                     (CUSIP NUMBER OF CLASS OF SECURITIES)

<TABLE>
<CAPTION>

<S>                                              <C>                                <C> 
      J. VIRGIL WAGGONER                            FRANK J. HEVRDEJS                 FRANK J. HEVRDEJS    
PRESIDENT AND CHIEF EXECUTIVE OFFICER                  PRESIDENT                         PRESIDENT
   STERLING CHEMICALS, INC.                      THE STERLING GROUP, INC.           STX ACQUISITION CORP.  
1200 SMITH STREET, SUITE 1900                      EIGHT GREENWAY PLAZA              EIGHT GREENWAY PLAZA  
  HOUSTON, TEXAS 77002-4312                             SUITE 702                        SUITE 702            
                                                   HOUSTON, TEXAS 77046              HOUSTON, TEXAS 77046   
</TABLE>

        (NAME, ADDRESSES AND TELEPHONE NUMBERS OF PERSONS AUTHORIZED TO
  RECEIVE NOTICES AND COMMUNICATIONS ON BEHALF OF PERSON(S) FILING STATEMENT)


                              -------------------

This statement is filed in connection with (check the appropriate box):

(a) [x] The filing of solicitation materials or an information statement
        subject to Regulation 14A, Regulation 14C, or Rule 13e-3(c) under
        the Securities Exchange Act of 1934.
(b) [ ] The filing of a registration statement under the Securities Act of 1933.
(c) [ ] A tender offer.
(d) [ ] None of the above.

Check the following box if soliciting materials or information statement
referred to in checking box (a) are preliminary copies: [x]

                              ------------------
 
                           CALCULATION OF FILING FEE

===============================================================================

    TRANSACTION VALUATION                              AMOUNT OF FILING FEE

        $640,664,844*                                        $125.00**
===============================================================================

*     Calculated based on a proposed cash payment of $12.00 per share for
      53,388,737 shares.

[x]   Check box if any part of the fee is offset as provided by Rule D-11(a)(2)
      and identify the filing with which the offsetting fee was previously paid.
      Identify the previous filing by registration statement number, or the Form
      or Schedule and the date of its filing.

  Amount Previously Paid:    $128,133.00
  Form or Registration No.:  Preliminary Proxy Statement
  Filing Party:              Sterling Chemicals, Inc.
  Date Filed:                May 23, 1996

** To be filed with definitive materials.
================================================================================
<PAGE>
 
                                  INTRODUCTION

       This Rule 13e-3 Transaction Statement (the "Statement") relates to the
Amended and Restated Agreement and Plan of Merger, dated as of April 24, 1996
(the "Merger Agreement"), between Sterling Chemicals, Inc., a Delaware
corporation (the "Company") and STX Acquisition Corp., a Delaware corporation
("STX Acquisition"). STX Acquisition was formed in April 1996 by an investor
group led by The Sterling Group, Inc. ("TSG") and The Unicorn Group, L.L.C. to
effect the Merger. A copy of the Merger Agreement is attached as Annex A to the
Proxy Statement filed by the Company (the "Proxy Statement"). The Proxy
Statement is attached hereto as Exhibit (d)(1).

       Upon the terms and subject to the conditions of the Merger Agreement, at
the effective time of the transaction (the "Effective Time"):  (a) STX
Acquisition will be merged with and into the Company (the "Merger"), with the
Company continuing as the surviving corporation (the "Surviving Corporation");
(b) the current directors of the Company will resign and will be replaced by the
director candidates to be nominated by STX Acquisition; (c) substantially all of
the operating assets and associated liabilities of the Company will be
transferred to STX Chemicals Corp. ("Chemicals"), a wholly-owned subsidiary of
the Surviving Corporation; (d) the stockholders of the Company will be entitled
to (i) retain shares in the Surviving Corporation ("Rollover Shares") to the
extent that they make an election to do so (a "Rollover Election"), subject to
pro rata reduction in the event that Rollover Elections have been made to retain
more than an aggregate of 5.0 million Rollover Shares and (ii) receive $12.00
cash for each share of Common Stock of the Company ("Common Stock") not retained
as a Rollover Share (the "Cash Payment"); and (e) the issued and outstanding
shares of common stock of STX Acquisition will be converted into shares of
common stock of the Surviving Corporation. Depending on the number of Rollover
Shares, the issued and outstanding shares of common stock of STX Acquisition
will be converted into up to 8,589,580 shares of common stock of the Surviving
Corporation, representing approximately 79% of the total outstanding shares of
the Surviving Corporation.

       The following cross reference sheet shows the location in the preliminary
Proxy Statement relating to the Merger filed by the Company with the Securities
and Exchange Commission. The information in the preliminary Proxy Statement,
including all annexes thereto, is hereby expressly incorporated herein by
reference and the responses to each item of this Statement are qualified in
their entirety by the provisions of the preliminary Proxy Statement. The Proxy
Statement will be completed and, if appropriate, amended, prior to the time it
is first sent or given to stockholders of the Company. This Statement will be
amended to reflect such completion or amendment of the Proxy Statement.
    
       The filing of this Statement and the disclosures made herein and in the
Proxy Statement in compliance with Rule 13e-3 are not to be construed to deem
either of STX Acquisition or TSG or any of their affiliates as "affiliates" or
"control persons" of the Company or to be construed to deem either of Mr. Gordon
A. Cain or Mr. William A. McMinn as "affiliates" or "control persons" of TSG or
STX Acquisition. TSG and STX Acquisition do not believe that they are affiliates
or control persons of the Company for purposes of Rule 13e-3 or otherwise and
Messrs. Cain and McMinn do not believe that they are affiliates or control
persons of TSG or STX Acquisition for purposes of Rule 13e-3 or otherwise.    





                                       1
<PAGE>
 
                             CROSS REFERENCE SHEET
             

          ITEM IN
      SCHEDULE 13E-3                     LOCATION IN PROXY STATEMENT
- ---------------------------  ---------------------------------------------------
 
Item 1(a) and (b)..........  Outside Front Cover Page, "SUMMARY--Parties to the
                             Transaction," "--Votes Required" "--Market Prices
                             and Dividends," "THE SPECIAL MEETING--Purpose;
                             Record Date; Voting at the Special Meeting," "--
                             Votes Required" and "MARKET PRICES; DIVIDENDS."

Item 1(c) and (d)..........  "SUMMARY--Market Prices; Dividends" and "MARKET
                             PRICES; DIVIDENDS"

Item 1(e)..................  Not applicable.

Item 1(f)..................  Not applicable.

Item 2(a)-(d) and (g)......  Outside Front Cover Page, "SUMMARY--Parties to the
                             Transaction, "--Transaction Sponsors,"
                             "INCORPORATION BY REFERENCE" and ANNEX D.

Item 2(e) and (f)..........  Negative.

Item 3(a) and (b)..........  "SUMMARY--Background," "Fairness of the Merger," 
                             "--Opinion of Financial Advisor," "SPECIAL FACTORS
                             --Background," "--Fairness of the Merger", "--
                             Opinion of Financial Advisor" and "--Purpose and
                             Structure of the Transaction,"

Item 4(a) and 4(b).........  Outside Front Cover Page, "SUMMARY--Terms of 
                             the Merger," "--Effective Time of the Merger," "--
                             Interests of Certain Persons in the Merger," "--
                             Conditions to Consummation of the Merger," "--No
                             Solicitation; Fiduciary Duties," "--Termination;
                             Fees and Expenses," "SPECIAL FACTORS--Purpose and
                             Structure of the Transaction," "THE MERGER--Terms
                             of the Merger," "--Interests of Certain Persons in
                             the Merger," "--Effective Time of the Merger," "--
                             Summary of the Terms of Related Agreements,"  "--
                             Appraisal Rights of Dissenting Stockholders" and
                             ANNEX A.


                                       2
<PAGE>
 
Item 5(a) - (g)............  "SUMMARY--Terms of the Merger," "--Interests of 
                             Certain Persons in the Merger," "SPECIAL FACTORS--
                             Purpose and Structure of the Transaction," "--Risks
                             and Effects of the Merger," "--The Company's
                             Business After the Merger," "THE MERGER--Interests
                             of Certain Persons in the Merger," "--Source and
                             Amount of Funds" and "DIRECTORS AND EXECUTIVE
                             OFFICERS OF THE SURVIVING CORPORATION."

Item 6(a), (c) and (d).....  "SUMMARY--Financing Arrangements," and "THE
                             MERGER--Source and Amount of Funds."

Item 6(b)..................  "SUMMARY--Financing Arrangements," "THE
                             MERGER--Source and Amount of Funds" and "FEES
                             AND EXPENSES."

Item 7(a) - (d)............  Outside Front Cover Page, "SUMMARY--Background,"
                             "--Recommendation of the Board; Fairness of the
                             Merger," "--Opinion of Financial Advisor," "--
                             Appraisal Rights of Dissenting Stockholders," 
                             "--Certain Tax Consequences of the Merger," 
                             "--Interests of Certain Persons in the Merger,"
                             "SPECIAL FACTORS--Background," "--Fairness of the
                             Merger," "--Purpose and Structure of the
                             Transaction," "--Recommendation of the Board," 
                             "--Opinion of Financial Advisor," "--Risks and
                             Effects of the Merger," "--Certain Tax Consequences
                             of the Merger," "--The Company's Business After the
                             Merger," "THE MERGER--Interests of Certain Persons
                             in the Merger" and "--Appraisal Rights of
                             Dissenting Stockholders."

Item 8(a) - (f)............  Outside Front Cover Page, "SUMMARY--Background,"
                             "--Recommendation of the Board," "--Fairness of the
                             Merger," "--Opinion of Financial Advisor," "--Votes
                             Required," "THE SPECIAL MEETING--Votes Required,"
                             "SPECIAL FACTORS--Background," "--Recommendation of
                             the Board," "--Fairness of the Merger," "--Opinion
                             of Financial Advisor" and ANNEX B.

Item 9(a) - (c)............  "SUMMARY--Background," "--Recommendation of the
                             Board; Fairness of the Merger," "--Opinion of
                             Financial Advisor," "--Interests of Certain Persons
                             in the Merger," "SPECIAL FACTORS--Background," "--
                             Fairness of the Merger" "--Recommendation of the
                             Board," "--Opinion of Financial Advisor," and 
                             ANNEX B.

Item 10(a) and (b).........  "SUMMARY--Interests of Certain Persons in the
                             Merger," "THE MERGER--Interests of Certain Persons
                             in the Merger," "STOCK OWNERSHIP OF MANAGEMENT
                             AND CERTAIN BENEFICIAL OWNERS," and ANNEX D.

Item 11....................  "SUMMARY--Terms of Related Agreements," "THE 
                             MERGER--Summary of the Terms of Related
                             Agreements" and ANNEX A.

                                       3
<PAGE>
 
Item 12(a) and (b).........  "SUMMARY--Recommendation of the Board; Fairness of
                             the Merger," "--Terms of Related Agreements," 
                             "SPECIAL FACTORS--Recommendation of the Board" and
                             "THE MERGER--Summary of the Terms of Related
                             Agreements."

Item 13(a).................  Outside Front Cover Page, "SUMMARY--Votes
                             Required," "--Appraisal Rights of Dissenting
                             Stockholders," "THE SPECIAL MEETING--Votes
                             Required," "THE MERGER--Appraisal Rights of
                             Dissenting Stockholders," the Notice of Special
                             Meeting and ANNEX C.

Item 13(b).................  "SPECIAL FACTORS--Fairness of the Merger."

Item 13(c).................  Not applicable.

Item 14(a).................  "SUMMARY--Summary Historical Financial Data" and
                             "SELECTED HISTORICAL FINANCIAL DATA."

Item 14(b).................  "SUMMARY--Summary Pro Forma Financial Data" and
                             "PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS AND
                             OTHER INFORMATION."

Item 15(a).................  "SPECIAL FACTORS--Risks and Effects of the Merger,"
                             "--The Company's Business After the Merger," "THE
                             MERGER," "DIRECTORS AND EXECUTIVE OFFICERS OF THE
                             SURVIVING CORPORATION," "FEES AND EXPENSES" and
                             ANNEX A.

Item 15(b).................  "THE SPECIAL MEETING--Revocation and Use of
                             Proxies; Solicitation."

Item 16....................  Proxy Statement, Letter to Stockholders and Notice
                             of Special Meeting.

Item 17....................  Separately included herewith.

                                       4
<PAGE>
 
ITEM 1.  ISSUER AND CLASS OF SECURITY SUBJECT TO THE TRANSACTION

       (a) and (b) The information set forth on the Outside Front Cover Page and
in "SUMMARY--Parties to the Transaction," "--Votes Required," "THE SPECIAL
MEETING--Purpose; Record Date; Voting at the Special Meeting," "--Votes
Required" "MARKET PRICES; DIVIDENDS" of the Proxy Statement is incorporated
herein by reference.

       (c) and (d) The information set forth in "SUMMARY--Market Prices;
Dividends" and "MARKET PRICES; DIVIDENDS" of the Proxy Statement is incorporated
herein by reference.

       (e) Not applicable.  

       (f) Not applicable.  

ITEM 2.  IDENTITY AND BACKGROUND.
    
       (a) - (d) and (g) This Statement is being filed by TSG, STX Acquisition,
the Company, which is the issuer of the Common Stock, the class of equity
securities to which this Statement relates, Mr. Gordon A. Cain and Mr. William
A. McMinn (collectively, the "Filing Persons"). The information set forth on the
Outside Front Cover Page and in "SUMMARY--Parties to the Transaction" "--
Transaction Sponsors," "INCORPORATION BY REFERENCE" and ANNEX D of the Proxy
Statement is incorporated herein by reference.     

       (e) and (f) During the last five years, none of the Filing Persons, nor
to the best of their knowledge any of the officers, directors or control persons
of the Filing Persons, (i) has been convicted in a criminal proceeding
(excluding traffic violations or similar misdemeanors) or (ii) was a party to a
civil proceeding of a judicial or administrative body of competent jurisdiction
and as a result of such proceeding was or is subject to a judgment, decree or
final order enjoining further violations of, or prohibiting activities subject
to, Federal or State securities laws or finding any violation of such laws.

ITEM 3.  PAST CONTACTS, TRANSACTIONS OR NEGOTIATIONS.

       (a) and (b) The information set forth in "SUMMARY--Background," "--
Fairness of the Merger," "--Opinion of Financial Advisor," "SPECIAL FACTORS--
Background," "Fairness of the Merger," "--Opinion of Financial Advisor," and
"--Purpose and Structure of the Transaction" of the Proxy Statement is
incorporated herein by reference.

ITEM 4.  TERMS OF THE TRANSACTION.

       (a) and (b) The information set forth on the Outside Front Cover Page and
in "SUMMARY--Terms of the Merger," "--Effective Time of the Merger,"
"--Interests of Certain Persons in the Merger," "--Conditions to Consummation of
the Merger," "--No Solicitation; Fiduciary Duties," "--Termination; Fees and
Expenses," "SPECIAL FACTORS--Purpose and Structure of the Transaction," "THE
MERGER--Terms of the Merger," "--Interests of Certain Persons in the Merger,"
"--Summary of the Terms of Related Agreements" and "--Appraisal Rights of
Dissenting Stockholders" and ANNEX A of the Proxy Statement is incorporated by
reference.


                                       5
<PAGE>
 
ITEM 5.  PLANS OR PROPOSALS OF THE ISSUER OR AFFILIATE.

       (a) - (g) The information set forth in "SUMMARY--Terms of the Merger,"
"--Interests of Certain Persons in the Merger," "SPECIAL FACTORS--Purpose and
Structure of the Transaction," "--Risks and Effects of the Merger," "--The
Company's Business After the Merger," "THE MERGER--Interests of Certain Persons
in the Merger," "--Source and Amount of Funds" and "DIRECTORS AND EXECUTIVE
OFFICERS OF THE SURVIVING CORPORATION" of the Proxy Statement is incorporated
herein by reference.

ITEM 6.  SOURCE AND AMOUNTS OF FUNDS OR OTHER CONSIDERATION.

       (a), (c) and (d) The information set forth in "SUMMARY--Financing
Arrangements" and "THE MERGER--Source and Amount of Funds" of the Proxy
Statement is incorporated herein by reference.

       (b) The information set forth in "SUMMARY--Financing Arrangements," "THE
MERGER--Source and Amount of Funds" and "FEES AND EXPENSES" of the Proxy
Statement is incorporated herein by reference.

ITEM 7.  PURPOSE(S), ALTERNATIVES, REASONS AND EFFECTS.

       (a) - (d) The information set forth on the Outside Front Cover Page and
in "SUMMARY--Background," "--Recommendation of the Board; Fairness of the
Merger," "--Opinion of Financial Advisor," "--Appraisal Rights of Dissenting
Stockholders," "--Certain Tax Consequences of the Merger," "--Interests of
Certain Persons in the Merger," "SPECIAL FACTORS--Background," "--Fairness of
the Merger," "--Purpose and Structure of the Transaction," "--Recommendation of
the Board," "--Opinion of Financial Advisor," "--Risks and Effects of the
Merger," "--Certain Tax Consequences of the Merger," "THE MERGER--Interests of
Certain Persons in the Merger," and "--Appraisal Rights of Dissenting
Stockholders" of the Proxy Statement is incorporated herein by reference.

ITEM 8.  FAIRNESS OF THE TRANSACTION.

       (a) - (f) The information set forth on the Outside Front Cover Page and
 in "SUMMARY--Background," "--Recommendation of the Board; Fairness of the
 Merger," "--Opinion of Financial Advisor," "--Votes Required," "THE SPECIAL
 MEETING--Votes Required," "SPECIAL FACTORS--Background," "--Recommendation of
 the Board," "--Fairness of the Merger," "--Opinion of Financial Advisor," and
 Annex B of the Proxy Statement is incorporated herein by reference.

ITEM 9.  REPORTS, OPINIONS, APPRAISALS AND CERTAIN NEGOTIATIONS.

       (a) - (c) The information set forth in "SUMMARY--Background," 
"--Recommendation of the Board; Fairness of the Merger," "--Opinion of Financial
Advisor," "--Interests of Certain Persons in the Merger," "SPECIAL FACTORS--
Background," "--Fairness of the Merger," "--Recommendation of the Board," 
"--Opinion of Financial Advisor" and Annex B of the Proxy Statement is
incorporated herein by reference.

ITEM 10.  INTEREST IN SECURITIES OF THE ISSUER.

       (a) and (b) The information set forth in "SUMMARY--Interests of Certain
Persons in the Merger," "THE MERGER--Interests of Certain Persons in the
Merger," "STOCK OWNERSHIP OF MANAGEMENT AND CERTAIN BENEFICIAL OWNERS" and 
Annex D of the Proxy Statement is incorporated herein by reference.

                                       6
<PAGE>
 
ITEM 11.  CONTRACTS, ARRANGEMENTS OR UNDERSTANDINGS WITH RESPECT TO THE ISSUER'S
SECURITIES.

       The information set forth in "SUMMARY--Terms of Related Agreements," "THE
MERGER--Summary of the Terms of Related Agreements," and ANNEX A of the Proxy
Statement is incorporated herein by reference. See also exhibits (c)(1), (c)(2),
(c)(3), (c)(4), (c)(5), (c)(6), (c)(7), and (c)(8) attached hereto.

ITEM 12.  PRESENT INTENTION AND RECOMMENDATION OF CERTAIN PERSONS WITH REGARD TO
THE TRANSACTION.

       (a) and (b) The information set forth in "SUMMARY--Recommendation of the
Board; Fairness of the Merger," "SPECIAL FACTORS--Recommendation of the Board"
and "THE MERGER--Summary of the Terms of Related Agreements" of the Proxy
Statement is incorporated herein by reference.

ITEM 13.  OTHER PROVISIONS OF THE TRANSACTION.

       (a) The information set forth in the Outside Front Cover Page, "SUMMARY--
Votes Required," "--Appraisal Rights of Dissenting Stockholders," "THE SPECIAL
MEETING--Votes Required," "THE MERGER--Appraisal Rights of Dissenting
Stockholders" and ANNEX C of the Proxy Statement, and in the Notice of Special
Meeting attached to the Proxy Statement, is incorporated herein by reference.

       (b) The information set forth in "SPECIAL FACTORS--Fairness of the
Merger" of the Proxy Statement is incorporated herein by reference.

       (C)  Not applicable.

ITEM 14.  FINANCIAL INFORMATION.

       (a) The information set forth in "SUMMARY--Summary Historical Financial
Data" and "SELECTED HISTORICAL FINANCIAL DATA" of the Proxy Statement is
incorporated herein by reference.

       (b) The information set forth in "SUMMARY - Summary Pro Forma Financial
Data," and "PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS AND OTHER INFORMATION"
of the Proxy Statement is incorporated herein by reference.

ITEM 15.  PERSONS AND ASSETS EMPLOYED, RETAINED OR UTILIZED.

       (a) The information set forth in "SPECIAL FACTORS--Risks and Effects
of the Merger," "--The Company's Business After the Merger," "THE
MERGER," "DIRECTORS AND EXECUTIVE OFFICERS OF THE SURVIVING CORPORATION," "FEES
AND EXPENSES" and ANNEX A of the Proxy Statement is incorporated herein by
reference.

       (b) The information set forth in "THE SPECIAL MEETING--Revocation and Use
of Proxies; Solicitation" of the Proxy Statement is incorporated herein by
reference.

ITEM 16.  ADDITIONAL INFORMATION.

       Additional information concerning the Merger is set forth in the Proxy
Statement, Letter to Stockholders and Notice of Special Meeting which are
attached hereto as Exhibit (d)(1).

ITEM 17.  MATERIAL TO BE FILED AS EXHIBITS.
    
      *(a)  Credit Agreement among STX Chemicals Corp., Texas Commerce Bank as
            Agent, Credit Suisse and Chase Securities Inc. as co-arrangers,
            and the lenders named therein.     

                                       7
<PAGE>
     

       (b)    Fairness opinion dated April 24, 1996 delivered by
              Lazard Freres & Co. LLC (filed herewith as Annex B to the Proxy
              Statement that is filed as Exhibit (d)(1) hereto).

       (c)(1) Merger Agreement (filed herewith as Annex A to the Proxy
              Statement that is filed as Exhibit (d)(1) hereto).

      +(c)(2) Inducement Agreement dated as of April 24, 1996.

       (c)(3) Form of Tag-Along Agreement (filed herewith as Exhibit A to Annex 
              A to the Proxy Statement that is filed as Exhibit (d)(1) hereto).

      +(c)(4) Agreement and Irrevocable Proxy executed by J. Virgil Waggoner,
              dated as of April 24, 1996.

      +(c)(5) Agreement and Irrevocable Proxy executed by Gordon A. Cain, dated 
              as of April 24, 1996.

      +(c)(6) Agreement and Irrevocable Proxy executed by Robert W. Roten, dated
              as of April 24, 1996.

      +(c)(7) Agreement and Irrevocable Proxy executed by Frank J. Hevrdejs,
              dated as of April 24, 1996.

      +(c)(8) Agreement and Irrevocable Proxy executed by William C. Oehmig,
              dated as of April 24, 1996.
 
       (d)(1) Proxy Statement of the Company, Notice of Special Meeting of
              Stockholders of the Company, Letter to Stockholders of the
              Company and Proxy Card.

       (e)(1) Section 262 of the Delaware General Corporation Law (filed
              herewith as Annex C to the Proxy Statement that is filed as
              Exhibit (d)(1) hereto).

       (f)    None.

- ----------------
* To be filed by amendment.

+ Previously filed.
     

                                       8
<PAGE>
 
                                   SIGNATURE

       After due inquiry and to the best of its knowledge and belief, the
undersigned certifies that the information set forth in this Statement is true,
complete and correct.
    
Dated:  July 3, 1996     

                                  STERLING CHEMICALS, INC.

                                  By: /s/ J. VIRGIL WAGGNOER
                                      J. Virgil Waggoner
                                      President and Chief Executive Officer

                                       9
<PAGE>
 
                                   SIGNATURE

       After due inquiry and to the best of its knowledge and belief, the
undersigned certifies that the information set forth in this Statement is true,
complete and correct.
    
Dated:  July 3, 1996     

                                  THE STERLING GROUP, INC.

                                  By: /s/ FRANK J. HEVRDEJS 
                                      Name:   Frank J. Hevrdejs
                                      Title:  President

                                       10
<PAGE>
 
                                   SIGNATURE
                                   ---------

       After due inquiry and to the best of its knowledge and belief, the
undersigned certifies that the information set forth in this Statement is true,
complete and correct.
    
Dated:  July 3, 1996     

                                  STX ACQUISITION CORP.

                                  By: /s/ FRANK J. HEVRDEJS
                                      Name:   Frank J. Hevrdejs
                                      Title:  President


                                      11
<PAGE>
 
    
                                   SIGNATURE
                                   ---------

       After due inquiry and to the best of his knowledge and belief, the
undersigned certifies that the information set forth in this Statement is true,
complete and correct.

Dated:  July 3, 1996

                              /s/  GORDON A. CAIN
                              -------------------------
                                   GORDON A. CAIN     


                                       12
<PAGE>
 
    
                                   SIGNATURE
                                   ---------

       After due inquiry and to the best of his knowledge and belief, the
undersigned certifies that the information set forth in this Statement is true,
complete and correct.

Dated:  July 3, 1996

                              /s/  WILLIAM A. MCMINN
                              -----------------------------------
                                   WILLIAM A. MCMINN     

                                      13
<PAGE>
 
                               INDEX TO EXHIBITS

Exhibit                                                          Sequential
Number                         Description                        Page No.
- ---------                      -----------                       ----------
    
 *(a)        Credit Agreement among STX Chemicals Corp., Texas
             Commerce Bank as Agent, Credit Suisse and Chase
             Securities Inc. as co-arrangers, and the lenders
             named therein.

  (b)        Fairness opinion dated April 24, 1996 delivered by
             Lazard Freres & Co. LLC (filed herewith as Annex B
             to the Proxy Statement that is filed as Exhibit
             (d)(1) hereto).

  (c)(1)     The Merger Agreement (filed herewith as Annex A to
             the Proxy Statement that is filed as Exhibit (d)(1)
             hereto).

 +(c)(2)     Inducement Agreement dated as of April 24, 1996.

  (c)(3)     Form of Tag-Along Agreement (filed herewith as 
             Exhibit A to Annex A to the Proxy Statement that is
             filed as Exhibit (d)(1) hereto).

 +(c)(4)     Agreement and Irrevocable Proxy executed by 
             J. Virgil Waggoner, dated as of April 24, 1996.

 +(c)(5)     Agreement and Irrevocable Proxy executed by 
             Gordon A. Cain, dated as of April 24, 1996.

 +(c)(6)     Agreement and Irrevocable Proxy executed by 
             Robert W. Roten, dated as of April 24, 1996.

 +(c)(7)     Agreement and Irrevocable Proxy executed by 
             Frank J. Hevrdejs, dated as of April 24, 1996.

 +(c)(8)     Agreement and Irrevocable Proxy executed by 
             William C. Oehmig, dated as of April 24, 1996.
 
  (d)(1)     Proxy Statement of the Company, Notice of Special
             Meeting of Stockholders of the Company, Letter to
             Stockholders of the Company and Proxy Card.

  (e)(1)     Section 262 of the Delaware General Corporation Law 
             (filed herewith as Annex C to the Proxy Statement that
             is filed as Exhibit (d)(1) hereto).

  (f)        None.

- ------------
* To be filed by amendment.
+ Previously filed.     
                                       14

<PAGE>
 
                                 SCHEDULE 14A
                                (RULE 14A-101)
                    INFORMATION REQUIRED IN PROXY STATEMENT
 
                           SCHEDULE 14A INFORMATION
     
  PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF
                          1934 (AMENDMENT NO. 2)     
 
Filed by the Registrant [X]
 
Filed by a Party other than the Registrant [_]
 
                                          [_]Confidential, for Use of the
Check the appropriate box:                   Commission Only (as Permitted by
                                             Rule 14a-6(e)(2))
 
[X] Preliminary Proxy Statement
 
[_] Definitive Proxy Statement
 
[_] Definitive Additional Materials
 
[_] Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12
 
 
                           STERLING CHEMICALS, INC.
- -------------------------------------------------------------------------------
               (Name of Registrant as Specified In Its Charter)
 
 
- -------------------------------------------------------------------------------
   (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
[_] $125 per Exchange Act Rules 0-11(c)(1)(ii), 14a-6(i)(1), 14a-6(i)(2) or
Item 22(a)(2) of Schedule 14A.
 
[_] $500 per each party to the controversy pursuant to Exchange Act Rule 14a-
6(i)(3).
 
[_] Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.
     
  (1) Title of each class of securities to which transaction applies: _____    
 
  (2) Aggregate number of securities to which transaction applies:
     
  _________________________________________________________________________    
     
  (3) Per unit price or other underlying value of transaction computed
    pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the
    filing fee is calculated and state how it was determined):     
   --------------------------------------------------------------------------
     
  (4) Proposed maximum aggregate value of transaction:     
   --------------------------------------------------------------------------
     
  (5) Total fee paid:     
   --------------------------------------------------------------------------
 
[X] Fee paid previously with preliminary materials.
 
[_] Check box if any part of the fee is offset as provided by Exchange Act
  Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
  paid previously. Identify the previous filing by registration statement
  number, or the Form or Schedule and the date of its filing.
 
  (1) Amount previously paid:
   --------------------------------------------------------------------------
 
  (2) Form, Schedule or Registration Statement No.:
   --------------------------------------------------------------------------
 
  (3) Filing party:
   --------------------------------------------------------------------------
 
  (4) Date filed:
   --------------------------------------------------------------------------
<PAGE>
 
                           STERLING CHEMICALS, INC.
 
                           [LETTERHEAD APPEARS HERE]
 
                                                                July [  ], 1996
 
Dear Stockholder:
   
  You are cordially invited to attend a Special Meeting (the "Special
Meeting") of Stockholders of Sterling Chemicals, Inc. (the "Company") to be
held on August [   ], 1996. at [    ] a.m., Central Time, at
[                     ], Houston, Texas [      ]. As described in the enclosed
Proxy Statement, at the Special Meeting, the stockholders of the Company will
be asked to consider and vote upon a proposal to approve and adopt the Amended
and Restated Agreement and Plan of Merger, dated as of April 24, 1996 (the
"Merger Agreement"), between the Company and STX Acquisition Corp. ("STX
Acquisition"), a Delaware corporation formed by The Sterling Group, Inc.
("TSG") and The Unicorn Group, L.L.C. ("Unicorn"), each a private financial
organization, to acquire a controlling interest in the Company. A copy of the
Merger Agreement is attached to the Proxy Statement as Annex A. On July [  ],
1996 (the "Record Date"), principals of TSG owned 897,000 shares of Common
Stock of the Company, representing approximately 1.6% of the issued and
outstanding shares.     
   
  Upon the terms and subject to the conditions of the Merger Agreement, at the
effective time of the transaction (the "Effective Time"): (a) STX Acquisition
will be merged with and into the Company (the "Merger"), with the Company
continuing as the surviving corporation (the "Surviving Corporation"); (b) the
current directors of the Company will resign and will be replaced by the
director candidates to be nominated by STX Acquisition (except for Mr. J.
Virgil Waggoner, none of the nominees of STX Acquisition are current members
of the Board of Directors of the Company); (c) substantially all of the
operating assets and associated liabilities of the Company will be transferred
to STX Chemicals Corp. ("Chemicals"), a wholly-owned subsidiary of the
Surviving Corporation; (d) the stockholders of the Company will be entitled to
(i) retain shares in the Surviving Corporation ("Rollover Shares") to the
extent that they make an election to do so (a "Rollover Election"), subject to
pro rata reduction in the event that Rollover Elections have been made to
retain more than an aggregate of 5.0 million Rollover Shares and (ii) receive
$12.00 cash for each share of Common Stock of the Company ("Common Stock") not
retained as a Rollover Share (the "Cash Payment"); and (e) the issued and
outstanding shares of common stock of STX Acquisition will be converted into
shares of common stock of the Surviving Corporation. Depending on the number
of Rollover Shares, the issued and outstanding shares of common stock of STX
Acquisition will be converted into up to 8,589,580 shares of common stock of
the Surviving Corporation, representing approximately 79% of the total
outstanding shares of the Surviving Corporation. TSG and Unicorn have advised
the Company that there are no current intentions to engage in a second step
transaction to eliminate minority shareholders following the Merger.     
 
  The affirmative vote of a majority of the issued and outstanding shares of
Common Stock entitled to vote thereon is required to approve and adopt the
Merger Agreement. Only holders of record of shares of Common Stock as of the
close of business on the Record Date are entitled to notice of and to vote at
the Special Meeting and any and all adjournments and postponements thereof.
Each of Messrs. Frank J. Hevrdejs and William C. Oehmig (stockholders of the
Company and principals of TSG), and Messrs. Gordon A. Cain, J. Virgil
Waggoner, and Robert W. Roten, entered into an Agreement and Irrevocable Proxy
(collectively, the "Irrevocable Proxies") with STX Acquisition as of April 24,
1996 pursuant to which each such stockholder appointed STX Acquisition and
certain officers of STX Acquisition, as proxy to vote his shares of Company
Common Stock in favor of the Merger Agreement at the Special Meeting. The
Irrevocable Proxies represent approximately 18% of the outstanding Common
Stock of the Company in the aggregate.
 
  Shares of Common Stock owned by stockholders who have not voted in favor of
the Merger and who have otherwise properly exercised their rights for
appraisal of such shares in accordance with Section 262 of the Delaware
General Corporation Law ("DGCL") ("Dissenting Shares") will become, as of the
Effective Time, the right to receive such consideration as may be determined
to be due pursuant to Section 262 of the DGCL. Shares of Common Stock owned by
STX Acquisition or held in the Company's treasury will be canceled and
retired.
<PAGE>
 
   
  Consummation of the Merger is subject to certain conditions, including the
completion of financing to provide an aggregate of approximately $826.0
million which will be used to fund the Cash Payments, the repayment of
outstanding indebtedness, the purchase of other outstanding equity interests
and estimated transaction fees and expenses. Transaction costs are estimated
at approximately $40 million and will be paid by the Company. The financing
transactions will include debt and equity offerings and bank financings.     
   
  In order to induce STX Acquisition to execute the Merger Agreement and
consummate the transactions contemplated thereby, Messrs. Frank J. Hevrdejs,
William C. Oehmig, Gordon A. Cain, J. Virgil Waggoner and Robert W. Roten each
executed an Inducement Agreement with the Company dated as of April 24, 1996
(the "Inducement Agreement"). Pursuant to the Inducement Agreement, Messrs.
Cain, Waggoner and Roten each agreed to make Rollover Elections as to a
portion of their shares of Common Stock (amounting to an aggregate of
1,404,254 Rollover Shares), subject to pro rata reduction with Rollover
Elections made by other stockholders of the Company if the Maximum Rollover
Amount is exceeded. Messrs. Hevrdejs and Oehmig, each principals of TSG,
agreed to make Rollover Elections as to 100% of their Common Stock (amounting
to an aggregate of 897,000 Rollover Shares) which Rollover Elections would not
be subject to pro rata reduction. As a result of the Inducement Agreement, the
Merger is expected to be accounted for as a recapitalization. Unless the
Rollover Elections exceed the Maximum Rollover Amount, following the Merger,
Messrs. Cain, Waggoner and Roten would collectively own approximately 12.9% of
the outstanding shares of common stock in the Surviving Corporation and
Messrs. Hevrdejs and Oehmig would collectively own a minimum of 8.2% of the
outstanding shares of common stock in the Surviving Corporation.     
 
  The Company expects the liquidity of the Common Stock to be significantly
diminished after consummation of the Merger due to (i) the substantial
reduction in the number of outstanding shares (from approximately 55.7 million
shares prior to the Merger to approximately 10.9 million shares thereafter),
(ii) the delisting of the Common Stock from trading on the New York Stock
Exchange, and (iii) statutory and contractual restrictions on transfer of the
shares of the Surviving Corporation issued in exchange for common stock of STX
Acquisition.
 
  A Special Committee (the "Special Committee") of the Board of Directors of
the Company (the "Board") unanimously recommended that the Board approve the
Merger Agreement, and the Board has unanimously approved the Merger Agreement
and the transactions contemplated thereby, including the Merger. The Board has
determined that the Merger is fair to, and in the best interests of, the
holders of the Common Stock and recommends that stockholders vote FOR the
approval and adoption of the Merger Agreement.
 
  The recommendation of the Special Committee and the approval and
determination of the Board were based on a number of factors described in the
accompanying Proxy Statement (the "Proxy Statement"), including the opinion of
Lazard Freres & Co. LLC ("Lazard"), the financial advisor engaged by the
Special Committee, to the effect that, based upon and subject to various
considerations set forth in such opinion, as of the date of such opinion, the
consideration to be received by the holders of the Common Stock of the Company
in connection with the Merger was fair to such holders (other than TSG or any
of its affiliates) from a financial point of view. The opinion of Lazard is
included as Annex B to the Proxy Statement and should be read in its entirety.
 
  PLEASE READ THE PROXY STATEMENT, WHICH PROVIDES A DETAILED DESCRIPTION OF
THE TERMS OF THE MERGER AND CERTAIN OTHER INFORMATION, BEFORE CASTING YOUR
VOTE.
 
  Whether or not you plan to attend the Special Meeting in person and
regardless of the number of shares of Common Stock you own, you should
complete, sign, date and return the enclosed proxy card to the Transfer Agent
in the accompanying prepaid envelope marked "Proxy." You may, of course,
attend the Special Meeting and vote in person, even if you have previously
returned your proxy card. Authorization of the Merger requires the approval of
a majority of the issued and outstanding shares of Common Stock entitled to
vote thereon. A failure to vote will have the same effect as a vote against
the Merger. YOU ARE URGED, THEREFORE, TO SIGN, DATE AND RETURN THE ENCLOSED
PROXY CARD PROMPTLY. PLEASE NOTE THAT THE PROXY CARD MUST BE RECEIVED AT OR
PRIOR TO THE SPECIAL MEETING FOR YOUR SHARES TO BE VOTED BY PROXY AT THE
SPECIAL MEETING.
 
                                       2
<PAGE>
 
   
  If you wish to make a Rollover Election with respect to any or all of your
shares of Common Stock, you should complete, sign, date and return the
enclosed Rollover Election Form (together with stock certificates representing
a number of shares at least equal to the number of shares as to which your
Rollover Election is made) to the Exchange Agent in the accompanying prepaid
envelope marked "Election Form." A failure to execute a Rollover Election Form
and submit stock certificates representing a sufficient number of shares of
Common Stock will result in your being entitled only to receive the Cash
Payment for all shares you hold on the Record Date, unless you have perfected
your appraisal rights under the DGCL. PLEASE NOTE THAT THE ROLLOVER ELECTION
FORM AND STOCK CERTIFICATES MUST BE RECEIVED BY THE EXCHANGE AGENT, KEYCORP
SHAREHOLDER SERVICES, NO LATER THAN 5:00 P.M., NEW YORK TIME, ON AUGUST [  ],
1996, THE DAY BEFORE THE DATE OF THE SPECIAL MEETING. YOU ARE URGED,
THEREFORE, TO SIGN, DATE AND RETURN THE ROLLOVER ELECTION FORM AND STOCK
CERTIFICATES PROMPTLY IF YOU WISH TO MAKE A ROLLOVER ELECTION.     
 
                                          Sincerely,
 
                                          Gordon A. Cain
                                          Chairman of the Board
 
                                          J. Virgil Waggoner
                                          President and Chief Executive
                                           Officer
 
 
                                       3
<PAGE>
 
YOUR VOTE IS IMPORTANT--PLEASE EXECUTE AND RETURN THE ENCLOSED PROXY PROMPTLY,
    WHETHER OR NOT YOU PLAN TO ATTEND THE STERLING CHEMICALS, INC. SPECIAL
                                   MEETING.
 
                           STERLING CHEMICALS, INC.
 
                               ----------------
 
                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                        
                     TO BE HELD ON AUGUST [  ], 1996     
 
                               ----------------
 
To the Stockholders of Sterling Chemicals, Inc.:
   
  Notice is hereby given that a Special Meeting (the "Special Meeting") of
stockholders of STERLING CHEMICALS, INC. (the "Company") will be held on
August [  ], 1996, at [    ] a.m., Central Time, at [                       ],
Houston, Texas [      ] for the following purposes:     
 
    I. To consider and vote upon a proposal to approve and adopt the Amended
  and Restated Agreement and Plan of Merger, dated as of April 24, 1996 (the
  "Merger Agreement"), between the Company and STX Acquisition Corp. ("STX
  Acquisition"), a Delaware corporation formed by The Sterling Group, Inc.
  ("TSG") and The Unicorn Group, L.L.C. ("Unicorn"), each a private financial
  organization, to acquire a controlling interest in the Company. Upon the
  terms and subject to the conditions of the Merger Agreement, at the
  effective time of the transaction (the "Effective Time"): (a) STX
  Acquisition will be merged with and into the Company (the "Merger"), with
  the Company continuing as the surviving corporation (the "Surviving
  Corporation"); (b) the current directors of the Company will resign and
  will be replaced by the director candidates to be nominated by STX
  Acquisition (except for Mr. J. Virgil Waggoner, none of the nominees of STX
  Acquisition are current members of the Board of Directors of the Company);
  (c) substantially all of the operating assets and associated liabilities of
  the Company will be transferred to STX Chemicals Corp. ("Chemicals"), a
  wholly-owned subsidiary of the Surviving Corporation; (d) the stockholders
  of the Company will be entitled to (i) retain shares in the Surviving
  Corporation ("Rollover Shares") to the extent that they make an election to
  do so (a "Rollover Election"), subject to pro rata reduction in the event
  that Rollover Elections have been made to retain more than an aggregate of
  5.0 million Rollover Shares (the "Maximum Rollover Amount") and (ii)
  receive $12.00 cash for each share of Common Stock of the Company ("Common
  Stock") not retained as a Rollover Share (the "Cash Payment"); and (e) the
  issued and outstanding shares of common stock of STX Acquisition will be
  converted into shares of common stock of the Surviving Corporation.
  Depending on the number of Rollover Shares, the issued and outstanding
  shares of common stock of STX Acquisition will be converted into up to
  8,589,580 shares of common stock of the Surviving Corporation, representing
  approximately 79% of the total outstanding shares of the Surviving
  Corporation.
 
    II. To transact such other business as may properly come before the
  Special Meeting, including any and all adjournments and postponements
  thereof.
 
  A copy of the Merger Agreement appears as Annex A to, and is described in,
the accompanying Proxy Statement (the "Proxy Statement").
 
  A Special Committee (the "Special Committee") of the Board of Directors of
the Company (the "Board") unanimously recommended that the Board approve the
Merger Agreement, and the Board has unanimously approved the Merger Agreement
and the transactions contemplated thereby, including the Merger. The Board has
determined that the Merger is fair to, and in the best interests of, the
holders of the Common Stock and recommends that stockholders vote FOR the
approval and adoption of the Merger Agreement.
 
  The recommendation of the Special Committee and the approval and
determination of the Board were based on a number of factors described in the
Proxy Statement, including the opinion of Lazard Freres & Co. LLC ("Lazard"),
the financial advisor engaged by the Special Committee, to the effect that,
based upon and subject to various considerations set forth in such opinion, as
of the date of such opinion, the consideration to be received by the holders
of the Common Stock of the Company in connection with the Merger was fair to
such holders (other than TSG or any of its affiliates) from a financial point
of view. The opinion of Lazard is included as Annex B to the Proxy Statement
and should be read in its entirety.
<PAGE>
 
  PLEASE READ THE PROXY STATEMENT, WHICH PROVIDES A DETAILED DESCRIPTION OF
THE TERMS OF THE MERGER AND CERTAIN OTHER INFORMATION, BEFORE CASTING YOUR
VOTE.
 
  Whether or not you plan to attend the Special Meeting in person and
regardless of the number of shares of Common Stock you own, you should
complete, sign, date and return the enclosed proxy card to the Transfer Agent
in the accompanying prepaid envelope marked "Proxy." You may, of course,
attend the Special Meeting and vote in person, even if you have previously
returned your proxy card. Approval and adoption of the Merger Agreement
requires the approval of the holders of at least a majority of the issued and
outstanding shares of Common Stock entitled to vote thereon. A failure to vote
will have the same effect as a vote against the Merger. YOU ARE URGED,
THEREFORE, TO SIGN, DATE AND RETURN THE ENCLOSED PROXY CARD PROMPTLY. PLEASE
NOTE THAT THE PROXY CARD MUST BE RECEIVED AT OR PRIOR TO THE SPECIAL MEETING
FOR YOUR SHARES TO BE VOTED BY PROXY AT THE SPECIAL MEETING.
 
  If you wish to make a Rollover Election with respect to any or all of your
shares of Common Stock, you should complete, sign, date and return the
enclosed Rollover Election Form (together with stock certificates representing
a number of shares at least equal to the number of shares as to which your
Rollover Election is made) to the Exchange Agent in the accompanying prepaid
envelope marked "Election Form." A failure to execute a Rollover Election Form
and submit stock certificates representing a sufficient number of shares of
Common Stock will result in your being entitled only to receive the Cash
Payment for all shares you hold on the Record Date (as defined below), unless
you have perfected your appraisal rights under the Delaware General
Corporation Law ("DGCL"). PLEASE NOTE THAT THE ROLLOVER ELECTION FORM AND
STOCK CERTIFICATES MUST BE RECEIVED BY THE EXCHANGE AGENT, KEYCORP SHAREHOLDER
SERVICES, NO LATER THAN 5:00 P.M., NEW YORK TIME, ON            , 1996, THE
DAY BEFORE THE DATE OF THE SPECIAL MEETING. YOU ARE URGED, THEREFORE, TO SIGN,
DATE AND RETURN THE ROLLOVER ELECTION FORM AND STOCK CERTIFICATES PROMPTLY IF
YOU WISH TO MAKE A ROLLOVER ELECTION.
   
  Under Section 251 of the DGCL, the affirmative vote of a majority of the
issued and outstanding shares of Common Stock entitled to vote thereon is
required to approve and adopt the Merger Agreement. Only holders of record of
shares of Common Stock as of the close of business on July [  ], 1996 (the
"Record Date") are entitled to notice of and to vote at the Special Meeting
and any and all adjournments and postponements thereof. Each of Messrs. Frank
J. Hevrdejs, William C. Oehmig, J. Virgil Waggoner, Robert W. Roten and Gordon
A. Cain entered into an Agreement and Irrevocable Proxy (collectively, the
"Irrevocable Proxies") with STX Acquisition as of April 24, 1996 pursuant to
which each such stockholder appointed STX Acquisition and certain officers of
STX Acquisition as proxy to vote his shares of Company Common Stock in favor
of the Merger Agreement. The Irrevocable Proxies represent approximately 18%
of the outstanding Common Stock of the Company in the aggregate.     
 
  Under the DGCL, stockholders of the Company have the right to dissent from
the Merger and demand appraisal rights for their shares of Common Stock,
provided that the Merger is consummated and such stockholders comply with the
requirements of Section 262 of the DGCL. See "THE MERGER--Appraisal Rights of
Dissenting Stockholders" in the Proxy Statement for a description of the
rights of dissenting stockholders and a discussion of the procedures which
must be followed by dissenting stockholders of the Company to obtain appraisal
of their shares of Common Stock.
 
                                          Sincerely,
 
                                          F. Maxwell Evans
                                          Secretary
 
Houston, Texas
July [  ], 1996
 
                                       2
<PAGE>
 
                                                               PRELIMINARY COPY
 
                           STERLING CHEMICALS, INC.
                         1200 SMITH STREET, SUITE 1900
                           HOUSTON, TEXAS 77002-4312
 
                               ----------------
 
                                PROXY STATEMENT
 
                               ----------------
 
                        SPECIAL MEETING OF STOCKHOLDERS
                          
                       TO BE HELD AUGUST [  ], 1996     
 
                            INTRODUCTORY STATEMENT
   
  This proxy statement ("Proxy Statement") is being furnished to the
stockholders of Sterling Chemicals, Inc., a Delaware corporation (the
"Company"), in connection with the solicitation of proxies by the Board of
Directors of the Company (the "Board") for use at a Special Meeting of
Stockholders (the "Special Meeting") to be held on August [  ], 1996, at
[    ] a.m., Central Time, at [                      ].     
 
  At the Special Meeting, you will be asked to consider and vote upon a
proposal to approve and adopt the Amended and Restated Agreement and Plan of
Merger, dated as of April 24, 1996 (the "Merger Agreement"), between the
Company and STX Acquisition Corp. ("STX Acquisition"), a Delaware corporation
formed at the direction of an investor group led by The Sterling Group, Inc.
("TSG") and The Unicorn Group, L.L.C. ("Unicorn"), each a private financial
organization, in order to acquire a controlling interest in the Company. Upon
the terms and subject to the conditions of the Merger Agreement, at the
effective time of the transaction (the "Effective Time"): (a) STX Acquisition
will be merged with and into the Company (the "Merger"), with the Company
continuing as the surviving corporation (the "Surviving Corporation"); (b) the
current directors of the Company will resign and will be replaced by the
director candidates to be nominated by STX Acquisition (except for Mr. J.
Virgil Waggoner, none of the nominees of STX Acquisition are current members
of the Board of Directors of the Company); (c) substantially all of the
operating assets and associated liabilities of the Company will be transferred
to STX Chemicals Corp. ("Chemicals"), a wholly-owned subsidiary of the
Surviving Corporation; (d) the stockholders of the Company will be entitled to
(i) retain shares in the Surviving Corporation ("Rollover Shares") to the
extent that they make an election to do so (a "Rollover Election"), subject to
pro rata reduction in the event that Rollover Elections have been made to
retain more than an aggregate of 5.0 million Rollover Shares (the "Maximum
Rollover Amount") and (ii) receive $12.00 cash for each share of Common Stock
of the Company ("Common Stock") not retained as a Rollover Share (the "Cash
Payment"); and (e) the issued and outstanding shares of common stock of STX
Acquisition will be converted into shares of common stock of the Surviving
Corporation. Depending on the number of Rollover Shares, the issued and
outstanding shares of common stock of STX Acquisition will be converted into
up to 8,589,580 shares of common stock of the Surviving Corporation,
representing approximately 79% of the total outstanding shares of the
Surviving Corporation.
 
  Shares of Common Stock owned by stockholders who have not voted in favor of
the Merger and who have otherwise properly exercised their rights for
appraisal of such shares in accordance with Section 262 of the Delaware
General Corporation Law ("DGCL") ("Dissenting Shares") will become, as of the
Effective Time, the right to receive such consideration as may be determined
to be due pursuant to Section 262 of the DGCL. Shares of Common Stock owned by
STX Acquisition or held in the Company's treasury will be canceled and
retired. See "THE MERGER--Appraisal Rights of Dissenting Stockholders."
 
<PAGE>
 
   
  In order to induce STX Acquisition to execute the Merger Agreement and
consummate the transactions contemplated thereby, Messrs. Frank J. Hevrdejs,
William C. Oehmig, Gordon A. Cain, J. Virgil Waggoner and Robert W. Roten each
executed an Inducement Agreement with the Company dated as of April 24, 1996
(the "Inducement Agreement"). Pursuant to the Inducement Agreement, Messrs.
Cain, Waggoner and Roten each agreed to make Rollover Elections as to a
portion of their shares of Common Stock (amounting to an aggregate of
1,404,254 Rollover Shares), subject to pro rata reduction with Rollover
Elections made by other stockholders of the Company if the Maximum Rollover
Amount is exceeded. Messrs. Hevrdejs and Oehmig, each principals of TSG,
agreed to make Rollover Elections as to 100% of their Common Stock (amounting
to an aggregate of 897,000 Rollover Shares) which Rollover Elections would not
be subject to pro rata reduction. As a result of the Inducement Agreement, the
Merger is expected to be accounted for as a recapitalization. Unless the
Rollover Elections exceed the Maximum Rollover Amount, following the Merger,
Messrs. Cain, Waggoner and Roten would collectively own approximately 12.9% of
the outstanding shares of common stock in the Surviving Corporation and
Messrs. Hevrdejs and Oehmig would collectively own a minimum of 8.2% of the
outstanding shares of common stock in the Surviving Corporation. See "THE
MERGER--Summary of the Terms of Related Agreements."     
 
  A copy of the Merger Agreement is included as Annex A hereto. The summaries
of the portions of the Merger Agreement set forth in this Proxy Statement do
not purport to be complete and are subject to, and are qualified in their
entirety by reference to, the text of the Merger Agreement.
 
  The Company expects the liquidity of the Common Stock to be significantly
diminished after consummation of the Merger due to (i) the substantial
reduction in the number of outstanding shares (from approximately 55.7 million
shares prior to the Merger to approximately 10.9 million shares thereafter),
(ii) the delisting of the Common Stock from trading on the New York Stock
Exchange, and (iii) statutory and contractual restrictions on transfer of the
shares issued in the Merger in exchange for common stock of STX Acquisition.
   
  The affirmative vote of a majority of the issued and outstanding shares of
Common Stock entitled to vote thereon is required to adopt the Merger
Agreement. Only holders of record of shares of Common Stock at the close of
business on July [  ], 1996 (the "Record Date") are entitled to notice of and
to vote at the Special Meeting and any and all adjournments and postponements
thereof. Certain of the Company's stockholders have entered into an Agreement
and Irrevocable Proxy (collectively, the "Irrevocable Proxies"), pursuant to
which each such stockholder appoints STX Acquisition and certain officers of
STX Acquisition as his proxy to, among other things, vote his shares of the
Company Common Stock in favor of the Merger Agreement. The Irrevocable Proxies
represent approximately 18% of the outstanding Common Stock of the Company in
the aggregate. See "THE SPECIAL MEETING--Votes Required."     
 
  THE BOARD OF DIRECTORS OF THE COMPANY UNANIMOUSLY RECOMMENDS THAT THE
STOCKHOLDERS VOTE FOR APPROVAL AND ADOPTION OF THE MERGER AGREEMENT AND THE
TRANSACTIONS CONTEMPLATED THEREBY, INCLUDING THE MERGER.
 
  This Proxy Statement is first being mailed to the Company's stockholders on
or about July [  ], 1996. The information herein concerning the Company and
its advisors has been furnished by the Company. The information herein
concerning TSG, Unicorn, STX Acquisition, their respective directors, officers
and affiliates and the financing to be obtained in connection with the Merger
has been furnished by TSG, Unicorn and STX Acquisition.
 
                               ----------------
 
 THIS TRANSACTION HAS NOT BEEN APPROVED  OR DISAPPROVED BY THE SECURITIES AND
  EXCHANGE  COMMISSION  OR  ANY  STATE SECURITIES  COMMISSION  NOR  HAS  THE
   COMMISSION OR ANY  STATE SECURITIES COMMISSION PASSED  UPON THE FAIRNESS
    OR  MERITS OF SUCH  TRANSACTION NOR UPON  THE ACCURACY OR  ADEQUACY OF
     THE  INFORMATION CONTAINED IN  THIS DOCUMENT. ANY REPRESENTATION  TO
       THE CONTRARY IS UNLAWFUL.
 
                               ----------------
 
              THE DATE OF THIS PROXY STATEMENT IS JULY [  ], 1996
 
                                       2
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>   
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
SUMMARY....................................................................   1
  Parties to the Transaction...............................................   1
  Transaction Sponsors.....................................................   2
  Background...............................................................   2
  Terms of the Merger......................................................   3
  Financing Arrangements...................................................   4
  Recommendation of the Board; Fairness of the Merger......................   5
  Opinion of Financial Advisor.............................................   5
  Certain Litigation.......................................................   6
  Effective Time of the Merger.............................................   6
  Conditions to Consummation of the Merger.................................   6
  No Solicitation; Fiduciary Duties........................................   7
  Termination; Fees and Expenses...........................................   7
  Special Meeting; Date, Time, Place and Purpose of the Meeting............   8
  Votes Required...........................................................   8
  Appraisal Rights of Dissenting Stockholders..............................   9
  Terms of Related Agreements..............................................   9
  Risks and Effects of the Merger..........................................   9
  Certain Tax Consequences of the Merger...................................  11
  Interests of Certain Persons in the Merger...............................  12
  Market Prices; Dividends.................................................  13
  Summary Historical Consolidated Financial Data...........................  14
  Summary Pro Forma Financial Data.........................................  15
THE COMPANY................................................................  16
  Business Strategy........................................................  17
THE SPECIAL MEETING........................................................  17
  Purpose; Record Date; Voting at the Special Meeting......................  17
  Votes Required...........................................................  17
  Rollover Elections.......................................................  18
  Revocation and Use of Proxies; Solicitation..............................  19
  Solicitation; Fees and Expenses..........................................  19
SPECIAL FACTORS............................................................  19
  Background...............................................................  19
  Fairness of the Merger...................................................  24
  Purpose and Structure of the Transaction.................................  25
  Recommendation of the Board..............................................  26
  Opinion of Financial Advisor.............................................  26
  Accounting Treatment.....................................................  30
  Certain Tax Consequences of the Merger...................................  30
  Risks and Effects of the Merger..........................................  36
  The Company's Business After the Merger..................................  40
  Differences in the Rights of Holders of Rollover Shares..................  43
THE MERGER.................................................................  43
  Terms of the Merger......................................................  43
  Interests of Certain Persons in the Merger...............................  47
  Certain Litigation.......................................................  51
  Effective Time of the Merger.............................................  51
  Regulatory Approvals.....................................................  51
  Summary of the Terms of Related Agreements...............................  51
</TABLE>    
 
                                       i
<PAGE>
 
<TABLE>   
<S>                                                                          <C>
  Source and Amount of Funds................................................  53
  Appraisal Rights of Dissenting Stockholders...............................  58
MARKET PRICES; DIVIDENDS....................................................  60
SELECTED HISTORICAL FINANCIAL DATA..........................................  62
PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS AND OTHER INFORMATION...........  63
CAPITALIZATION..............................................................  69
AMENDMENTS TO CERTIFICATE OF INCORPORATION AND BYLAWS.......................  70
  Change in Certificate of Incorporation and Bylaws.........................  70
  Name......................................................................  70
  Common Stock..............................................................  70
  Preferred Stock...........................................................  70
  Number, Election and Removal of Directors.................................  70
  Limitation of Access of Stockholders to Books and Records.................  71
  Limitation on Directors and Officers Liability............................  71
  Action and Meetings of Stockholders.......................................  72
  Amendment of Bylaws.......................................................  72
  Amendment of Restated Charter.............................................  72
  Section 203...............................................................  72
STOCK OWNERSHIP OF MANAGEMENT AND CERTAIN BENEFICIAL OWNERS.................  73
DIRECTORS AND EXECUTIVE OFFICERS OF THE SURVIVING CORPORATION...............  74
CERTAIN FINANCIAL PROJECTIONS...............................................  76
INDEPENDENT PUBLIC ACCOUNTANTS..............................................  82
FEES AND EXPENSES...........................................................  82
ADDITIONAL INFORMATION......................................................  83
INCORPORATION BY REFERENCE..................................................  83
OTHER MATTERS...............................................................  84
  ANNEX A AMENDED AND RESTATED AGREEMENT AND PLAN OF MERGER ................ A-1
  ANNEX B FAIRNESS OPINION OF LAZARD FRERES & CO. LLC....................... B-1
  ANNEX C SECTION 262 OF THE DELAWARE GENERAL CORPORATION LAW............... C-1
  ANNEX D OFFICERS AND DIRECTORS OF TSG AND STX ACQUISITION................. D-1
</TABLE>    
 
 
                                       ii
<PAGE>
 
 
                                    SUMMARY
 
  The following is a brief summary of certain information contained elsewhere
in this Proxy Statement. This Summary does not purport to be complete and
should be read in conjunction with, and is qualified in its entirety by
reference to, the more detailed information appearing elsewhere or incorporated
by reference in this Proxy Statement and the Annexes hereto. Stockholders are
urged to read this Proxy Statement, including such Annexes, in its entirety.
 
PARTIES TO THE TRANSACTION
 
  Sterling Chemicals, Inc. Sterling Chemicals, Inc. (the "Company" or
"Surviving Corporation") is one of North America's leading producers of
selected commodity petrochemicals, used in the production of a wide array of
consumer goods and industrial products, and pulp chemicals used in paper
manufacturing. The Company ranks among the top three North American producers
in terms of rated production capacity for each of its primary products,
including styrene, acrylonitrile, acetic acid and sodium chlorate. Other
products manufactured by the Company include methanol, plasticizers, tertiary
butylamine, sodium cyanide and sodium chlorite. The Company manufactures all of
its petrochemicals at a single facility in Texas City, Texas (the "Texas City
Plant"). The Company's pulp chemicals are currently produced at four plants in
Canada. A fifth plant, under construction in Valdosta, Georgia, is scheduled to
begin production in late 1996.
 
  The Company began operations approximately 10 years ago when an operating
facility of Monsanto Company was purchased by the Company in a leveraged buyout
led by Messrs. Gordon A. Cain and J. Virgil Waggoner. The address of the
Company's principal executive office is 1200 Smith Street, Suite 1900, Houston,
Texas 77002-4312.
   
  STX Acquisition Corp. STX Acquisition Corp. ("STX Acquisition") is a Delaware
corporation recently formed at the direction of an investor group led by The
Sterling Group, Inc. ("TSG") and The Unicorn Group, L.L.C. ("Unicorn") for the
purpose of effecting the Merger. STX Acquisition currently has no material
assets and has not engaged in any activities except in connection with the
Merger Agreement and the transactions contemplated thereby. Pursuant to the
Merger Agreement, STX Acquisition has commenced a private placement of its
common stock (the "Equity Private Placement"), which will represent an equity
contribution of up to approximately $103.1 million (subject to reduction
depending upon the number of Rollover Shares retained in the Merger), and will
commence a public offering (the "Units Offering") of Units consisting of Senior
Secured Discount Notes Due 2008 (the "Discount Notes") and Warrants to acquire
shares of common stock of the Surviving Corporation (the "Warrants"). The Units
Offering will provide proceeds of $100 million. See "THE MERGER--Sources and
Amount of Funds." The address of STX Acquisition's principal office is Eight
Greenway Plaza, Suite 702, Houston, Texas 77046.     
   
  STX Chemicals Corp. STX Chemicals Corp., a Delaware corporation
("Chemicals"), is a wholly-owned subsidiary of STX Acquisition. Chemicals
currently has no material assets and has not engaged in any activities except
in connection with the Merger Agreement and the transactions contemplated
thereby. Pursuant to the Merger Agreement, Chemicals will commence a public
offering (the "Notes Offering" and together with the Units Offering, the
"Offerings") of $275 million principal amount of Senior Subordinated Notes Due
2006 (the "Notes"), and will obtain $456.5 million of bank financing (the
"Credit Facility") consisting of (i) a $100 million revolving credit facility,
and (ii) two term loans and an ESOP term loan totaling $356.5 million. At the
Effective Time, the Company will transfer substantially all of its operating
assets and associated liabilities to Chemicals which, as a result of the
Merger, will have become a wholly-owned subsidiary of the Surviving Corporation
renamed "Sterling Chemicals, Inc." Following the Merger, the business and
operations currently conducted by the Company will be conducted by Chemicals.
The address of Chemicals' principal office is Eight Greenway Plaza, Suite 702,
Houston, Texas 77046.     
<PAGE>
 
 
TRANSACTION SPONSORS
   
  The Sterling Group, Inc. ("TSG") is a Texas-based private financial
organization engaged in the acquisition and ownership of operating businesses.
Since its formation in 1982, TSG has completed 31 acquisitions for a total
consideration of approximately $5 billion. Eleven of such acquisitions,
representing approximately $3.5 billion in total consideration, have involved
companies in various segments of the chemical industry. TSG promotes employee
ownership through the use of employee stock ownership plans, direct equity
ownership by management and key employees as well as profit sharing plans which
typically include all full-time employees. The address of TSG's principal
executive offices is Eight Greenway Plaza, Suite 702, Houston, Texas 77046. The
Unicorn Group, L.L.C. ("Unicorn") is a New Jersey-based private financial
organization engaged in the acquisition of businesses. Since its formation in
1984, Unicorn has originated investments in over 40 entrepreneurial companies
primarily in chemicals and related industries. Mr. Frank P. Diassi, the current
Managing General Partner of Unicorn, will be the Chairman of the Board of both
the Surviving Corporation and Chemicals, and Frank J. Hevrdejs, the President
and a principal of TSG, and Hunter Nelson, a principal of TSG, will both be
directors of the Surviving Corporation and Chemicals following the consummation
of the Merger. The address of Unicorn's principal executive offices is 6
Commerce Drive, Cranford, New Jersey 07016.     
   
  Mr. Gordon A. Cain, the Company's Chairman of the Board and Mr. Frank J.
Hevrdejs were the founders of TSG. In 1992, Mr. Cain made a decision to reduce
his level of business activity. By December 1993, Mr. Cain had sold all of his
stock in TSG and resigned as an officer and director of TSG, and in 1993 he
sold the remainder of his stock. Since that time, Mr. Cain has had no equity or
other financial interest in TSG. TSG is currently controlled by Mr. Hevrdejs
and Mr. William C. Oehmig, who is the husband of Mr. Cain's stepdaughter. On
the Record Date (as defined below), principals of TSG owned 897,000 shares of
Common Stock of the Company, representing approximately 1.6% of the outstanding
shares, and as of the date of the Merger Agreement owned 100% of the common
stock of STX Acquisition.     
   
  The Company, TSG and Unicorn do not believe that any affiliates of the
Company are also affiliated with either TSG or Unicorn.     
 
BACKGROUND
   
  Beginning in early 1995, the Company engaged in discussions with two
prospective industry purchasers, both of whom conducted an initial due
diligence review of the Company. Negotiations proceeded with both prospective
purchasers, but were terminated by the prospective purchasers by early March
1995. The Company then determined to discontinue active pursuit of a sale. In
October 1995, the Company was advised by TSG of its interest in a possible
purchase of the Company. In November 1995, in view of TSG's indication of
interest in acquiring the Company and several other indications of interest,
the Board determined that it should consider various alternatives to maximize
stockholder value. On November 10, 1995 the Board appointed a Special Committee
(the "Special Committee") to independently consider and evaluate a possible
sale of the Company and any other strategic alternatives available to the
Company to maximize stockholder value. In December 1995, the Special Committee,
together with its financial advisor, Lazard Freres & Co. LLC ("Lazard"), and
the Board discussed valuations of the Company under different alternatives,
including a sale or recapitalization of the Company, as well as under certain
operating strategies.  Lazard then conducted a test of the market on a broad
basis to determine the level of interest in a possible sale of the Company, as
well as an ongoing review of all strategic alternatives. In December 1995,
Lazard began to solicit bids through an auction process from a broad range of
financial and industrial buyers. The Company publicly announced on January 29,
1996 that it was engaged in an examination of strategic alternatives, including
a sale of the Company, and that the Company had engaged in preliminary
conversations with several potential bidders. The public announcement generated
interest from a number of potential bidders, and as a result, the Company
extended its deadline for the submission of final bids from February 29, 1996
to March 29, 1996.     
 
  On April 2, 1996, the Company reviewed the status of firm bids received,
which included only one bid for the purchase of the Company as a whole (the $12
per share bid by TSG and Unicorn) and bids by two other
 
                                       2
<PAGE>
 
   
parties for the separate purchases of the pulp and petrochemicals businesses of
the Company. The Special Committee determined that the bid from TSG and Unicorn
represented the highest and best bid made, and recommended to the Board that a
transaction with TSG and Unicorn be pursued. The Board directed the Company to
commence negotiations with TSG and Unicorn. On April 15, 1996, the Company
received an indication of interest from the Huntsman Corporation at $12 per
share subject to due diligence and board approval. In light of the definitive
$12 per share in hand from TSG and Unicorn, the Special Committee determined
not to pursue the Huntsman proposal. Huntsman withdrew its indication of
interest on April 29, 1996.     
   
  On April 24, 1996, the Special Committee recommended, and the Board
unanimously approved, the Merger Agreement and the Merger, and the Merger
Agreement was executed by the Company and STX Acquisition on April 25, 1996. On
June 11, 1996, an amendment to the Merger Agreement was executed by the Company
and STX Acquisition. See "SPECIAL FACTORS--Background."     
 
TERMS OF THE MERGER
   
  General. At the Effective Time, STX Acquisition will be merged with and into
the Company, with the Company continuing as the Surviving Corporation, and
substantially all of the operating assets and associated liabilities of the
Company will be transferred to Chemicals. Also at the Effective Time, the
current directors of the Company will resign and will be replaced by the
director candidates to be nominated by STX Acquisition. Except for Mr. J.
Virgil Waggoner, none of these candidates are current members of the Board of
Directors of the Company. All members of the Company's current management will
continue as such after the Effective Time with the exception of Mr. J. Virgil
Waggoner (who will be nominated by STX Acquisition to serve as a director and
Vice-Chairman of the Surviving Corporation's Board of Directors after the
Effective Time). See "DIRECTORS AND EXECUTIVE OFFICERS OF THE SURVIVING
CORPORATION."     
   
  Transaction Costs. Transaction costs are estimated at approximately $40
million and will be paid by the Company.     
 
  Cash Payment. At the Effective Time, each share of Common Stock held by the
Company's stockholders (other than Rollover Shares and Dissenting Shares) will
automatically be converted into the right to receive $12.00 (the "Cash
Payment"). The Cash Payment will be made as promptly as practicable following
the Effective Time upon receipt by KeyCorp. Shareholder Services (the "Exchange
Agent") of certificates representing the shares of Common Stock held by such
stockholders. No interest will be paid or accrued on the Cash Payment. See "THE
MERGER--Terms of the Merger."
 
  Rollover Shares. In lieu of receiving the Cash Payment, stockholders may
choose to maintain an equity interest in the Surviving Corporation by making an
election (a "Rollover Election") to retain all or a portion of their shares of
Common Stock as shares in the Surviving Corporation ("Rollover Shares"),
subject to pro rata reduction in the event Rollover Elections exceed 5.0
million Rollover Shares (the "Maximum Rollover Amount"). A Rollover Election
may be made by any person who is a record holder of Common Stock on the
business day before the Special Meeting (the "Election Date"), regardless of
whether such person returns a proxy or votes for or against the approval and
adoption of the Merger Agreement or abstains from voting at the Special
Meeting. Rollover Elections shall be made only by completing, executing and
delivering the Form of Election enclosed with this Proxy Statement, together
with the certificates representing at least the number of Rollover Shares
elected, duly endorsed by the record holder, to the Exchange Agent by 5:00
p.m., New York Time, on the Election Date.
 
  Issuance of Common Stock to STX Acquisition Stockholders. At the Effective
Time, the issued and outstanding shares of common stock of STX Acquisition will
be converted into shares of common stock of the Surviving Corporation.
Depending on the number of Rollover Shares, the common stock of STX Acquisition
will be converted into up to 8,589,580 shares of common stock of the Surviving
Corporation, representing approximately 79% of the total outstanding shares of
the Surviving Corporation.
 
                                       3
<PAGE>
 
 
FINANCING ARRANGEMENTS
 
  Pursuant to the terms of the Merger Agreement, STX Acquisition and Chemicals
are required to consummate certain related financings simultaneously with the
Effective Time of the Merger. The Company may terminate the Merger Agreement if
STX Acquisition has not arranged the required financing and satisfied the
applicable funding obligations by August 31, 1996. The financing for the Merger
will be provided through the Offerings together with borrowings pursuant to the
Credit Facility and the proceeds from the Equity Private Placement
(collectively, the "Financing").
   
  Pursuant to the Merger Agreement, Chemicals is required to negotiate and
enter into the Credit Facility with Texas Commerce Bank National Association,
as administrative agent, and Credit Suisse and Chase Securities Inc. as co-
arrangers. It is currently anticipated that the Credit Facility will consist of
(i) a six and one half year $100.0 million revolving credit facility (the
"Revolving Credit Facility"), (ii) a six and one half year $200.0 million term
loan and an eight year $150.0 million term loan (the "Term Loans") and (iii) a
four year $6.5 million ESOP term loan (the "ESOP Term Loan"), proceeds of which
will be used to fund a new Employee Stock Ownership Plan (the "New ESOP"). The
terms of the Credit Facility cannot be modified or amended in any material
respect without prior consultation with the Company.     
   
  Additional financing for the Merger is to be provided pursuant to the Notes
Offering by Chemicals and the Units Offering by STX Acquisition. The Notes will
consist of $275 million of Senior Subordinated Notes Due 2006. The Units will
consist of $100 million in initial proceeds of Senior Secured Discount Notes
Due 2008 and Warrants. The Notes and the Units will be registered under a
Registration Statement filed with the Securities and Exchange Commission (File
No. 333-4343).     
   
  Equity financing for the Merger is to be provided pursuant to commitments
from a group of investors to purchase a maximum of $103.1 million of Common
Stock of STX Acquisition in the Equity Private Placement. Purchasers in the
Equity Private Placement are expected to include an investor group formed by
TSG and Unicorn and the New ESOP. The New ESOP will acquire its shares with the
proceeds of a $6.5 million loan from Chemicals (the "Chemicals ESOP Loan"). It
is anticipated that upon consummation of the Merger, investors in the Equity
Private Placement, including principals of TSG and Unicorn, and certain
principal stockholders of the Company, including Messrs. Gordon A. Cain, J.
Virgil Waggoner and Robert W. Roten, will own at least 75% of common stock of
the Surviving Corporation, assuming the Maximum Rollover Amount. Investors who
are expected to own more than 5% of the outstanding common stock of the
Surviving Corporation following the Merger are identified under "STOCK
OWNERSHIP OF MANAGEMENT AND CERTAIN BENEFICIAL OWNERS." The commitments to
purchase pursuant to the Equity Private Placement may not be amended or
modified in any material respect without prior consultation with the Company.
    
                           SOURCES AND USES OF FUNDS
 
  The following table sets forth the estimated sources and uses of funds to
effect the Merger, as if the Merger occurred on March 31, 1996.
 
<TABLE>
<CAPTION>
      SOURCE OF FUNDS                                        DOLLARS IN MILLIONS
      ---------------                                        -------------------
      <S>                                                    <C>
      Credit Facility (a)...................................       $347.9
      Notes Offering........................................        275.0
      Units Offering........................................        100.0
      Equity Private Placement (b)..........................        103.1
                                                                   ------
        Total...............................................       $826.0
                                                                   ======
</TABLE>
 
                                       4
<PAGE>
 
 
<TABLE>
<CAPTION>
      USE OF FUNDS
      ------------
      <S>                                                                <C>
      Purchase of Company Common Stock (c).............................. $640.7
      Purchase of other equity interests (d)............................   14.6
      Refinance outstanding debt (e)....................................  124.2
      Chemicals ESOP Loan (f)...........................................    6.5
      Estimated transaction expenses and fees (g).......................   40.0
                                                                         ------
        Total........................................................... $826.0
                                                                         ======
</TABLE>
- --------
   
(a) Consists of amounts under the Term Loans, the Revolving Credit Facility and
    the ESOP Term Loan.     
(b) Represents proceeds from the sale of STX Acquisition common stock to
    investors in the Equity Private Placement, assuming the minimum number of
    Rollover Shares. The amount of cash provided through the Equity Private
    Placement may be reduced to $70.7 million if the Maximum Rollover Amount is
    retained by existing stockholders.
(c) Represents the funding of the purchase of Company Common Stock, at $12.00
    per share assuming the minimum number of Rollover Shares. The amount of
    funding required to purchase the Company Common Stock may be reduced to
    $608.3 million if the Maximum Rollover Amount is retained by existing
    stockholders.
(d) Pursuant to the terms of the Merger Agreement, stock appreciation rights
    ("SARs"), phantom stock and restricted stock will be converted at the time
    of consummation of the Merger into rights to receive cash.
(e) Consists of $107.2 million outstanding under the Company's current credit
    facility and $17.0 million outstanding under a credit facility associated
    with the Company's Valdosta, Georgia sodium chlorate plant.
(f) For a description of the Chemicals ESOP Loan, see "Special Factors--The
    Company's Business After the Merger."
(g) Estimated expenses and fees include underwriters' discounts, advisory fees,
    bank fees, legal and accounting fees, printing costs and other transaction
    expenses incurred in connection with the Merger and the Financing.
 
  As a result of the Merger, the Surviving Corporation will have increased cash
requirements for debt service relating to the Notes, the Discount Notes and the
Credit Facility. Such cash requirements are expected to be funded with
internally generated funds and, to the extent necessary, with borrowings under
the Revolving Credit Facility.
 
RECOMMENDATION OF THE BOARD; FAIRNESS OF THE MERGER
   
  On April 24, 1996 the Special Committee unanimously recommended that the
Board approve the Merger Agreement and the Board unanimously approved the
Merger Agreement and the transactions contemplated thereby, including the
Merger. The Board has determined that the Merger Agreement is fair to, and in
the best interests of, the stockholders of the Company and recommends that the
stockholders vote FOR the approval and adoption of the Merger Agreement and the
Merger. In considering its alternatives, including the maximization of
shareholder value through internal operating strategies, the Special Committee
took into account a number of factors, including the Company's $200 million
capital program, and concluded that maximum value would best be achieved by a
sale of the Company. For a discussion of the factors considered by the Special
Committee and the Board in reaching their recommendation and determination, see
"SPECIAL FACTORS--Recommendation of the Board," "--Fairness of the Merger" and
"--Opinion of Financial Advisor."     
 
OPINION OF FINANCIAL ADVISOR
   
  Lazard was retained by the Special Committee in November 1995 (after an
interview process with several other investment banking firms) to act as
financial advisor to the Special Committee in connection with possible
transactions and evaluation of alternatives available to the Company to enhance
stockholder value. Lazard has delivered to the Special Committee its written
opinion dated April 24, 1996, to the effect that, based upon and subject to
various considerations set forth in such opinion, as at the date of such
opinion the consideration to be received by the holders of Common Stock of the
Company in connection with the Merger was fair to such holders (other than TSG
or any of its affiliates) from a financial point of view. The full text of
Lazard's opinion,     
 
                                       5
<PAGE>
 
   
including the procedures followed, the matters considered and the assumptions
made by Lazard, is included as Annex B to this Proxy Statement and should be
read in its entirety. For a description of such opinion, see "SPECIAL FACTORS--
Opinion of Financial Advisor." Mr. Frank J. Pizzitola, a member of the Special
Committee, is a Limited Managing Director of Lazard. Mr. Pizzitola has no
operational or management responsibility at Lazard, and played no role in the
Special Committee's interview of Lazard or its subsequent selection of Lazard
as its financial advisor.     
 
CERTAIN LITIGATION
 
  Six putative class action complaints relating to the proposed Merger and the
events leading up to the Board's recommendation of the approval thereof, were
filed in the Court of Chancery for the State of Delaware, New Castle County,
Delaware in April and May 1996. A seventh putative class action complaint
relating to the same matters was filed in the District Court of Harris County,
Texas in May 1996. See "THE MERGER--Certain Litigation."
 
EFFECTIVE TIME OF THE MERGER
 
  The Merger will become effective (the "Effective Time") when a certificate of
merger (the "Certificate of Merger") is duly filed with the Secretary of State
of the State of Delaware in accordance with the Delaware General Corporation
Law ("DGCL") or at such later time as may be specified in the Certificate of
Merger. The filing of the Certificate of Merger will be made after all
conditions to the consummation of the Merger as set forth in the Merger
Agreement have been satisfied or waived. See "THE MERGER--Effective Time of the
Merger."
 
CONDITIONS TO CONSUMMATION OF THE MERGER
 
  The obligations of the Company and STX Acquisition to effect the Merger are
subject to the fulfillment at or prior to the closing of the transactions
pursuant to the Merger Agreement (the "Closing") of certain conditions,
including the following: (a) at the Special Meeting, the Merger Agreement shall
have been adopted by the affirmative vote of the holders of a majority of the
issued and outstanding shares of Common Stock entitled to vote thereon; (b) no
governmental authority shall have enacted, issued, promulgated, enforced or
entered any statute, law, rule, regulation, executive order, decree, injunction
or other order that has the effect of making the Merger illegal or otherwise
preventing or prohibiting the consummation of the Merger and other transactions
contemplated by the Merger Agreement; (c) any waiting period applicable to the
consummation of the Merger under the Hart-Scott-Rodino Antitrust Improvements
Act of 1976, as amended, shall have terminated or expired; (d) the registration
statement relating to the Offerings (the "Registration Statement") shall have
become effective; and (e) all governmental approvals legally required for the
consummation of the Merger shall have been obtained and be in effect on the
date of Closing (the "Closing Date").
   
  In addition, the obligation of STX Acquisition to effect the Merger is
subject to the fulfillment at or prior to the Closing of certain other
conditions, including the accuracy of representations and warranties of the
Company, the performance or compliance by the Company with all agreements and
obligations required by the Merger Agreement, the delivery to STX Acquisition
of legal opinions of Piper & Marbury L.L.P. and/or F. Maxwell Evans, the
delivery of comfort letters from Arthur Andersen LLP and/or Coopers & Lybrand
L.L.P., the absence of any material adverse changes in the business,
operations, properties, conditions or prospects of the Company and the
Subsidiaries, taken as a whole (excluding matters of general applicability or
matters generally affecting any of the industries in which the Company or any
of its Subsidiaries (as defined in the Merger Agreement) conduct business), and
the cancellation by the Company of certain stock options and other rights to
acquire stock, SARs and phantom stock. The obligation of STX Acquisition to
effect the Merger is also conditioned upon its having obtained the Financing
contemplated by the Merger Agreement. As of June 24, 1996, STX Acquisition     
 
                                       6
<PAGE>
 
   
delivered to the Company the Definitive Equity Documents and Definitive Bank
Loan Documents establishing its equity commitments and bank credit facilities.
See "THE MERGER--Terms of the Merger--Conditions to the Consummation of the
Merger."     
   
  The obligation of the Company to effect the Merger is also subject to the
fulfillment at or prior to the Closing of certain other conditions, including
the accuracy of representations and warranties of STX Acquisition, the
performance or compliance by STX Acquisition of all agreements and obligations
required by the Merger Agreement, the stockholders of STX Acquisition having
entered into a tag-along agreement and the delivery to the Company of the legal
opinion of Andrews & Kurth L.L.P. and/or Richards, Layton & Finger relating to
the Merger. Either STX Acquisition or the Company might choose to waive one or
more of the conditions in the Merger Agreement. See "THE MERGER--Terms of the
Merger--Conditions to the Consummation of the Merger."     
 
NO SOLICITATION; FIDUCIARY DUTIES
 
  Under the Merger Agreement, the Company agreed that it would immediately
cease any ongoing discussions or negotiations with any party (other than STX
Acquisition) regarding any acquisition or purchase of the Company or any of its
Subsidiaries (an "Acquisition Transaction"), and that, until the Effective Time
or the earlier termination of the Merger Agreement, neither the Company nor any
Subsidiary would solicit or participate in any discussions or otherwise
facilitate any Acquisition Transaction, including providing any non-public
information to any third party. However, if the Board of Directors determines
(a) after consultation with the Company's independent financial advisors, that
providing non-public information to a financially capable person (a "Potential
Acquiror") could lead to an Acquisition Transaction more favorable to the
Company's stockholders than the Merger, and (b) after consultation with outside
legal counsel, that there is a significant risk that the failure to provide
such non-public information to such Potential Acquiror would constitute a
breach of the Board's fiduciary duty to the Company's stockholders, the Company
may furnish non-public information to a Potential Acquiror and may participate
in negotiations with such Potential Acquiror regarding an Acquisition
Transaction (any proposal from a Potential Acquiror relating to an Acquisition
Transaction being referred to as a "Takeover Proposal").
 
  If the Board of Directors determines (a) after consultation with the
Company's financial advisors, that a Takeover Proposal would be more favorable
to the Company's stockholders than the Merger, and (b) after consultation with
outside legal counsel, that there is a significant risk that the failure to
take any such action would constitute a breach of the Board's fiduciary duties
to the Company's stockholders, then the Board or the Company may withdraw its
approval of the Merger Agreement and the Merger. The Board may then cause the
Company to accept or enter into an agreement with respect to the Takeover
Proposal, provided that (i) the Company gives STX Acquisition seven days prior
written notice of the Takeover Proposal, (ii) the Takeover Proposal relates to
the acquisition of more than 50% of the shares of Company Common Stock then
outstanding or substantially all of the assets of the Company and its
Subsidiaries, and (iii) the Company pays STX Acquisition a breakup fee in the
amount of $8 million. The Company otherwise agrees that neither it nor the
Board of Directors shall withdraw or modify its approval of the Merger
Agreement or the Merger, approve any Takeover Proposal, or cause the Company to
enter into any agreement with respect to any Takeover Proposal. See "THE
MERGER--Terms of the Merger--No Solicitation and Related Matters."
 
TERMINATION; FEES AND EXPENSES
 
  The Merger Agreement may be terminated and abandoned at any time prior to the
Effective Time, whether before or after approval by the stockholders of the
Company, by either STX Acquisition or the Company if (i) the Company's
stockholders do not approve the Merger at the Special Meeting, (ii) there is a
failure to close by October 31, 1996 (which failure is not the fault of the
terminating party), (iii) the Company accepts a Takeover
 
                                       7
<PAGE>
 
Proposal and pays an $8 million breakup fee to STX Acquisition, (iv) the other
party to the transaction remains in default of any of its covenants for 30 days
after notice of such default is given by the terminating party, or such other
party has breached any representation or warranty which cannot be cured prior
to October 31, 1996 or (v) the Merger is enjoined by court order.
 
  The Merger Agreement may also be terminated by STX Acquisition if holders of
more than ten percent (10%) of the Company's Common Stock demand appraisal
rights.
 
  The Merger Agreement may also be terminated by the Company if (i) by August
31, 1996, STX Acquisition has not arranged the Financing and satisfied the
funding conditions with respect thereto, (ii) STX Acquisition notifies the
Company that it does not believe it will be able to arrange the Financing by
October 31, 1996, (iii) any definitive bank loan document which is necessary in
order for STX Acquisition to obtain the Financing is terminated (other than by
STX Acquisition) prior to October 31, 1996 and STX Acquisition fails to replace
the same within 15 days, or (iv) any definitive equity document which is
necessary in order for STX Acquisition to obtain the Financing is terminated
(other than by STX Acquisition) prior to October 31, 1996 and STX Acquisition
fails to replace the same within 15 days. See "THE MERGER--Terms of the
Merger--Termination."
 
SPECIAL MEETING; DATE, TIME, PLACE AND PURPOSE OF THE MEETING
   
  The Special Meeting will be held on August [  ], 1996, at [    ] a.m.,
Central Time, at [                ], Houston, Texas [     ]. At the Special
Meeting, stockholders of the Company will be asked to consider and vote upon a
proposal to approve and adopt the Merger Agreement. The Board has fixed the
close of business on July [  ], 1996 as the record date (the "Record Date") for
the determination of stockholders entitled to notice of and to vote at the
Special Meeting and any and all adjournments and postponements thereof. See
"THE SPECIAL MEETING--Purpose; Record Date; Voting at the Special Meeting."
    
VOTES REQUIRED
   
  The presence, in person or represented by proxy, of a majority of the shares
of Common Stock entitled to vote at the Special Meeting is necessary to
constitute a quorum at the Special Meeting. Approval and adoption of the Merger
Agreement and the Merger requires, under Section 251 of the DGCL, the
affirmative vote of a majority of the shares of Common Stock issued and
outstanding on the Record Date and entitled to vote thereon. Only stockholders
of record at the close of business on the Record Date are entitled to notice of
and to vote at the Special Meeting or any adjournments or postponements
thereof. On the Record Date, [            ] shares of Common Stock, held by
approximately 14,000 holders of record, were issued and outstanding and
entitled to vote at the Special Meeting. Each of Messrs. Frank J. Hevrdejs,
William C. Oehmig, J. Virgil Waggoner, Robert W. Roten and Gordon A. Cain
entered into an Agreement and Irrevocable Proxy (collectively, the "Irrevocable
Proxies") with STX Acquisition as of April 24, 1996, pursuant to which each
such stockholder individually appointed STX Acquisition and certain of its
officers as his proxy to call and attend meetings of the stockholders of the
Company, to execute written consents and to vote the shares of the Company
Common Stock owned by such stockholder which he is entitled to vote at any
meeting of the stockholders of the Company, provided that any vote or consent
taken under the authority of such proxy shall be solely for the purposes of
adopting and approving the Merger and the Merger Agreement, or rejecting any
proposal for any other merger agreement or any other transaction for the sale
of the Company or its assets or any other transaction intended to frustrate or
impair the right or ability of STX Acquisition or the Company to consummate the
Merger. The Irrevocable Proxies represent approximately 18% of the outstanding
Common Stock of the Company in the aggregate. A total of approximately 23.0% of
the outstanding Common Stock of the Company is beneficially owned by senior
officers and directors of the Company as a group. In addition, employees of the
Company, including the senior officers, beneficially own approximately 10.8% of
the Company's outstanding Common Stock through the Company's ESOP. Except for
shares represented by the Irrevocable Proxies described above, there are no
commitments or understandings regarding how any of these shares will be voted.
See "THE SPECIAL MEETING--Votes Required."     
 
                                       8
<PAGE>
 
 
APPRAISAL RIGHTS OF DISSENTING STOCKHOLDERS
 
  Under the Section 262 of DGCL, if the Merger is effected, holders of shares
of Common Stock who have not voted in favor of the Merger and who have
otherwise properly exercised their rights for appraisal of such shares
("Dissenting Shares") will be entitled to appraisal rights in connection with
the Merger. See "THE MERGER--Appraisal Rights of Dissenting Stockholders" and
Annex C to this Proxy Statement.
 
TERMS OF RELATED AGREEMENTS
   
  Certain related agreements were entered in connection with the execution of
the Merger Agreement. The following is a summary of the material terms of such
agreements.     
   
  Inducement Agreement. In order to induce STX Acquisition to execute the
Merger Agreement and consummate the transactions contemplated thereby, Messrs.
Frank J. Hevrdejs, William C. Oehmig, Gordon A. Cain, J. Virgil Waggoner and
Robert W. Roten each executed an Inducement Agreement with the Company dated as
of April 24, 1996 (the "Inducement Agreement"). Pursuant to the Inducement
Agreement, Messrs. Cain, Waggoner and Roten each agreed to make Rollover
Elections as to a portion of their shares of Common Stock (amounting to an
aggregate of 1,404,254 Rollover Shares), subject to pro rata reduction with
Rollover Elections made by other stockholders of the Company if the Maximum
Rollover Amount is exceeded. Messrs. Hevrdejs and Oehmig, each principals of
TSG, agreed to make Rollover Elections as to 100% of their Common Stock
(amounting to an aggregate of 897,000 Rollover Shares) which Rollover Elections
would not be subject to pro rata reduction. As a result of the Inducement
Agreement, the Merger is expected to be accounted for as a recapitalization.
Unless the Rollover Elections exceed the Maximum Rollover Amount, following the
Merger, Messrs. Cain, Waggoner and Roten would collectively own approximately
12.9% of the outstanding shares of common stock in the Surviving Corporation
and Messrs. Hevrdejs and Oehmig would collectively own a minimum of 8.2% of the
outstanding shares of common stock in the Surviving Corporation.     
 
  Tag-Along Agreement. The stockholders of STX Acquisition will, as a condition
to the Company's obligation to effect the Merger, enter into a tag-along
agreement (the "Tag-Along Agreement") providing that each record stockholder of
the Company who has retained Rollover Shares will be permitted, under specified
circumstances involving a change of control, to transfer his shares on the same
terms and conditions applicable to any transfer of 51% or more of the shares of
common stock of the Surviving Corporation then outstanding by any STX
Acquisition stockholder (or stockholders acting together) party to the Tag-
Along Agreement.
 
RISKS AND EFFECTS OF THE MERGER
 
  In considering the matters set forth in this Proxy Statement, including the
decision of whether to make a Rollover Election (with respect to all or any
portion of their shares of Common Stock), stockholders of the Company should
carefully consider, among other things, the significant risks and factors
described below which are associated with the Company and which will
significantly increase the risks associated with, and may otherwise adversely
affect the value of, a continuing investment in the Surviving Corporation. See
"SPECIAL FACTORS--Risks and Effects of the Merger."
   
  Control by Certain Stockholders. Upon consummation of the Merger, the
investors in the Equity Private Placement, including principals of TSG and
Unicorn, and certain principal stockholders of the Company will own at least
75% of the outstanding shares of common stock in the Surviving Corporation.
These investors and stockholders will enter into a stockholders agreement (the
"Stockholders Agreement"), the effect of which will be to subject the transfer
of such shares to certain rights of first refusal. Such stockholders will
collectively have the ability to exercise control over the business and affairs
of the Surviving Corporation, including the ability to elect all of the Board
of Directors, the power to determine the management of the business and the
power to determine the outcome of corporate actions requiring stockholders'
approval. TSG and Unicorn have advised the     
 
                                       9
<PAGE>
 
   
Company that there are no current intentions to engage in a second step
transaction to eliminate minority shareholders following the Merger.     
 
  Limited Liquidity in Rollover Shares. The Company expects the liquidity of
the Common Stock to be significantly diminished after consummation of the
Merger due to (i) the substantial reduction in the number of outstanding shares
(from approximately 55,690,000 shares prior to the Merger to approximately
10,890,834 shares thereafter), (ii) the delisting of the Common Stock from
trading on the New York Stock Exchange, and (iii) restrictions on transfer of
the shares of the Surviving Corporation issued in exchange for stock of STX
Acquisition, which restrictions will be set forth in the Stockholders Agreement
and under applicable securities law.
   
  High Financial Leverage. If the Closing had occurred on March 31, 1996, the
Surviving Corporation, on a consolidated basis, would have had indebtedness of
$722.9 million and stockholders' equity of $(291.9) million, and Chemicals
would have had indebtedness of $622.9 million and stockholders' equity of
$(194.9) million. In addition, on a pro forma basis for the six months ended
March 31, 1996, the Surviving Corporation would have had a deficiency of
earnings to cover fixed charges of $1.1 million. The Surviving Corporation will
not be required to make interest payments on the Discount Notes prior to
  , 2002, but there can be no assurance that the Surviving Corporation will
have adequate cash available at that time and thereafter to make the scheduled
semi-annual interest payments. The high degree of leverage of the Surviving
Corporation and Chemicals will have important consequences to holders of
Rollover Shares, including the following: (i) the ability to obtain additional
financing in the future for working capital, capital expenditures,
acquisitions, general corporate purposes or other purposes, if needed, may be
impaired; (ii) a substantial portion of cash flow from operations will be
dedicated to the payment of interest, principal and other repayment
obligations, thereby reducing the funds available for operations and any future
business opportunities; and (iii) the degree of leverage may make the Surviving
Corporation and Chemicals more vulnerable to a downturn in its business or the
economy generally. Any inability of the Surviving Corporation or Chemicals to
service their respective obligations could have a significant adverse effect on
the market value and marketability of the Rollover Shares.     
 
  The Credit Facility and the Notes indenture and the Discount Notes indenture
entered into in connection with the Offerings (collectively, the "Indentures")
contain numerous financial and operating covenants, including, but not limited
to, restrictions on the Surviving Corporation's and Chemicals' ability to incur
indebtedness, pay dividends, create liens, sell assets, engage in certain
mergers and acquisitions and refinance existing indebtedness. The ability of
the Surviving Corporation and Chemicals to comply with such covenants and other
terms of the Credit Agreement and the Indentures, and to satisfy its other debt
obligations will depend on the future performance of the Surviving Corporation.
 
  Future Dilution From Warrant Exercises. In connection with the Units
Offering, Warrants will be offered with the Discount Notes. Such Warrants and
the underlying Common Stock will be dilutive to the holders of Common Stock
following the Merger. Because the number of Warrants to be issued in the Units
Offering will not be established until final pricing terms of the Units are
determined, the amount of such dilution is not currently known.
 
  Equity in Surviving Corporation. Upon consummation of the Merger, all of the
equity of the Surviving Corporation will be owned by the stockholders who
retain Rollover Shares and the investors in the Equity Private Placement.
Stockholders who do not retain Rollover Shares will have no continuing equity
interest in the Surviving Corporation, and will no longer participate in any
earnings or growth of the Surviving Corporation. Similarly, such persons will
no longer face a risk of a decline in the value of the Common Stock.
 
  Raw Material Prices and Availability. The Company does not currently produce
many of its major raw materials (benzene, ethylene, propylene, ammonia and
methanol). Price fluctuation and the dependence on one
 
                                       10
<PAGE>
 
or several significant suppliers could result in the Surviving Corporation
being required to incur increased costs for its raw materials, which could have
a material adverse effect on the results of operations of the Surviving
Corporation.
 
  Cyclical Markets for Products; Dependence on Key Products. The prices of the
Company's petrochemical and pulp chemical products have been cyclical and
sensitive to overall supply relative to demand, the level of general business
activity and the availability and price of feedstocks. Certain styrene monomer
producers have announced plans to add significant production capacity over the
next few years. The Company expects that prices for styrene will decline from
current levels until global demand for styrene increases sufficiently to absorb
such additional production capacity, and such declines could adversely affect
the Surviving Corporation's results of operations.
 
  Dependence on Texas City Plant. All of the Company's petrochemicals,
including all of its styrene and acrylonitrile, are produced at the Texas City
Plant. Significant unscheduled downtime at the Texas City Plant could
materially adversely affect the Surviving Corporation.
   
  Ability to Complete Acquisitions. A significant element of the Surviving
Corporation's business strategy is to pursue strategic acquisitions that either
expand or complement the Company's products or markets. The financing for such
acquisitions will likely affect the Surviving Corporation's debt or equity
capitalization. The terms of the Indentures and the Credit Facility will limit
the Surviving Corporation's ability to incur additional debt to finance such
acquisitions.     
 
  Highly Competitive Industry. The industry in which the Company operates is
highly competitive. The entrance of new competitors into the industry and the
addition by existing competitors of new capacity may reduce the Surviving
Corporation's ability to maintain profit margins or its ability to preserve its
market share, or both. Such developments could have a negative impact on the
Surviving Corporation's ability to obtain higher profit margins, even during
periods of increased demand for the Surviving Corporation's products.
 
  Environment and Safety. The Company's operations involve the handling,
production, transportation and disposal of materials classified as hazardous or
toxic and are subject to extensive federal, state and local regulatory
requirements relating to environmental affairs, waste management, health and
safety and chemical products. The operations of a chemical manufacturing
facility entail some risk of environmental damage, and there can be no
assurance that material costs or liabilities will not be incurred.
 
  Long-Term Contracts. The Company sells substantial portions of its styrene
and acrylonitrile production under long-term contracts, and all of its acetic
acid, plasticizers, tertiary butylamine and sodium cyanide production under
long-term contracts with single customers. Under certain market conditions, the
loss of one or more of these customers or a material reduction in the amount of
product purchased by one or more of them could have a material adverse effect
on the Surviving Corporation.
 
  Foreign Operations, Country Risks and Exchange Rate Fluctuations. Over 14% of
the Company's revenues are derived from Canadian operations and 52% are derived
from export sales. International operations and exports to foreign markets are
subject to a number of special risks, and earnings of foreign subsidiaries and
intercompany payments are subject to foreign income tax rules that may reduce
cash flow available to meet required debt service and other obligations of the
Surviving Corporation.
       
CERTAIN TAX CONSEQUENCES OF THE MERGER
 
  The Merger will have no U.S. federal income tax consequences for stockholders
who retain all of their Common Stock and receive no cash. Because the Maximum
Rollover Amount is limited to 5.0 million shares, and stockholders making a
Rollover Election will be subject to pro rata reduction in the event that
aggregate
 
                                       11
<PAGE>
 
Rollover Elections exceed the Maximum Rollover Amount, there can be no
assurance that a stockholder will be able to retain all shares of Common Stock
for which such stockholder makes a Rollover Election. To the extent that a
stockholder receives cash for some or all of such stockholder's Common Stock, a
portion of such cash will generally give rise to capital gain or loss to the
extent such cash is attributable to shares of Common Stock deemed sold pursuant
to the Merger, and the remainder of such cash will either give rise to capital
gain or loss or will be treated as dividend income, depending upon the
relationship between the stockholder's ownership interest (both actual and
constructive) in the Company immediately before and immediately after the
Merger. To the extent that the receipt of cash gives rise to capital gain or
loss, such gain or loss generally will be long-term capital gain or loss if the
Common Stock is held by the stockholder for more than one year. The foregoing
discussion does not address every federal income tax concern which may be
applicable to a particular stockholder. Each stockholder is urged to consult
such stockholder's own tax advisor to determine the tax consequences to such
stockholder, in the light of its particular circumstances, of the disposition
of Common Stock pursuant to the Merger. See "SPECIAL FACTORS--Certain Tax
Consequences of the Merger."
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
  In considering the recommendations of the Special Committee and the Board
with respect to the Merger, stockholders should be aware that certain members
of the Board and of management of the Company have certain interests which may
present them with potential conflicts of interests in connection with the
Merger. See "THE MERGER--Interests of Certain Persons in the Merger."
 
  Certain executive officers, directors and stockholders of the Company have
entered into Inducement Agreements pursuant to which they have agreed to make
Rollover Elections with respect to all or a portion of their shares of Common
Stock.
 
  Certain executive officers and directors own stock options ("Options"), SARs,
phantom stock and/or restricted stock with respect to the Common Stock. At the
Effective Time: (i) all of the Options and SARs will be cancelled and the
holders thereof will be entitled to receive cash in an amount equal to $12.00
less the Option exercise price or SAR grant price, as the case may be; (ii)
each phantom stock right will convert into the right to receive $12.00; and
(iii) all restricted stock awards will fully vest and shares of Common Stock
covered by such awards will be treated in the same manner as all other shares
of Common Stock in the Merger.
 
  The Company has adopted an Amended and Restated Consolidated Termination Pay
Plan for All Salaried Employees of Sterling Chemicals, Inc. and its
Subsidiaries, which generally provides that if any full time salaried
employee's employment is terminated by the Company for any reason other than
for cause, or the employee is requested to accept a new job which is less than
equivalent to such employee's job immediately prior to the change of control in
terms of compensation, level, responsibilities or credits, such employee shall
be entitled to receive termination pay equal to either 36 months' pay (for
certain members of senior management), or 24 months' pay (for all other
salaried employees), as well as certain other payments and benefits for such
periods.
 
  Other interests of certain persons in the Merger include the following: (i)
employees of the Company who continue their employment with the Surviving
Corporation will receive benefits substantially as favorable as those currently
supplied by the Company for a period of at least two years after the Closing
Date; (ii) Mr. J. Virgil Waggoner will become a director and Vice Chairman of
the Board of the Surviving Corporation; (iii) Mr. Robert W. Roten will become a
director and the President and Chief Executive Officer of the Surviving
Corporation; (iv) a lump sum payment will be made to Jim P. Wise, the Company's
Chief Financial Officer, pursuant to his employment agreement with the Company;
and (v) the Surviving Corporation will indemnify all officers, directors and
employees of the Company and its Subsidiaries against all losses and
liabilities based on the fact that such person is or was a director, officer or
employee of the Company or any of its Subsidiaries and arising out of acts or
omissions occurring prior to and including the Effective Time to the fullest
extent permitted by the DGCL, and the Surviving Corporation will maintain the
current policies of directors' and officers' liability insurance with respect
to matters occurring prior to the Effective Time for a period of no less than
six years.
 
                                       12
<PAGE>
 
   
  Relationships with TSG. TSG was founded in 1982 by Messrs. Gordon A. Cain and
Frank J. Hevrdejs. In 1992, Mr. Cain made a decision to reduce his level of
business activity. By December 1993, Mr. Cain had sold all of his stock in TSG
and resigned as an officer and director. Since that time, Mr. Cain has had no
equity or other financial interest in TSG, although at TSG's invitation he has
invested in three transactions organized by TSG. For marketing purposes, Mr.
Cain was described as Chairman Emeritus of TSG until November 1995, but since
December 1992 has had no role in TSG's ongoing operations. TSG is currently
controlled by Messrs. Hevrdejs and William C. Oehmig, the husband of Mr. Cain's
stepdaughter. Messrs. Cain and William A. McMinn assist TSG as senior advisors
on selected transactions. Although Mr. McMinn has received certain advisory
fees for such services, Mr. Cain has not. Neither Mr. Cain nor Mr. McMinn
participated in any such capacity in connection with the Merger. TSG and Mr.
McMinn recently assisted Mr. Cain with the acquisition of a company in a
transaction unrelated to the Merger. Messrs. Cain, Waggoner and McMinn, along
with principals of TSG, invested in such transaction. Messrs. Cain and McMinn
are members of the Board of Directors of the surviving corporation in such
transaction. Messrs. Cain and McMinn also sublease office space from TSG,
either directly or through companies with which they are affiliated. Messrs.
Cain and McMinn, along with J. Virgil Waggoner, Robert W. Roten, the Company's
Executive Vice-President, and Richard K. Crump, a Vice-President of the
Company, have previously co-invested with principals of TSG in several
transactions. In 1986, the Company's Texas City petrochemical facility was
purchased by the Company from Monsanto Company in a leveraged buyout led by Mr.
Cain (at which time he was a director and principal stockholder of TSG) and Mr.
Waggoner. On the Record Date, principals of TSG owned 897,000 shares of Common
Stock of the Company, representing approximately 1.6% of the outstanding
shares. As of the date of the Merger Agreement principals of TSG owned 100% of
the common stock of STX Acquisition.     
 
MARKET PRICES; DIVIDENDS
   
  The Common Stock is listed on the New York Stock Exchange ("NYSE"). As of
January 26, 1996, the last full trading day prior to the announcement that the
Company was considering its strategic alternatives including the sale of the
Company, the high and low sales prices of the Common Stock, as reported by the
NYSE, were $9 1/2 and $8 7/8, respectively. The high and low sales prices of
the Common Stock, as reported by the NYSE, for the period January 2, 1996
through January 26, 1996 were $9 3/8 and $8, respectively. As of April 24,
1996, the last full trading prior to the announcement by the Company of the
execution of the Merger Agreement, the high and low sales prices of the Common
Stock, as reported by the NYSE, were $13 and $12 3/4, respectively.     
 
  On July   , 1996, the high and low sales prices of the Common Stock, as
reported by the NYSE, were $     and $     , respectively.
 
  The following table sets forth for the periods shown, the high and low sales
prices for the Company's Common Stock, as reported by the NYSE:
 
<TABLE>
<CAPTION>
                                                                HIGH    LOW
                                                                ----    ----
      <S>                                                       <C>     <C>
      Third Quarter 1994....................................... $10     $ 5 1/2
      Fourth Quarter 1994...................................... 13 3/4     9
      First Quarter 1995....................................... 13 7/8    9 3/4
      Second Quarter 1995......................................  14      10 7/8
      Third Quarter 1995.......................................  13      10 1/4
      Fourth Quarter 1995...................................... 12 7/8    8 1/4
      First Quarter 1996.......................................  9 1/4    7 1/2
      Second Quarter 1996......................................  13        8
      Third Quarter 1996 (through July   , 1996)...............
</TABLE>
 
  The Company has not paid dividends on the Company Stock since fiscal 1993.
Under the Merger Agreement, the Company has agreed not to pay any dividends on
the Common Stock prior to the Effective Time. Pursuant to the Credit Agreement
and the Indentures to be entered into in connection with the Financing of the
 
                                       13
<PAGE>
 
Merger, the Surviving Corporation's ability to pay cash dividends will be
materially restricted. See "THE MERGER--Source and Amount of Funds."
 
SUMMARY HISTORICAL CONSOLIDATED FINANCIAL DATA
 
  The following table presents summary historical financial data for the
Company. The data should be read in conjunction with the historical
Consolidated Financial Statements and Notes thereto of the Company, certain of
which are incorporated by reference elsewhere in this Proxy Statement. The
consolidated financial information set forth below (i) at year end for each of
the years in the five-year period ended September 30, 1995 has been derived
from audited consolidated financial statements of the Company and (ii) as of
March 31, 1996 and March 31, 1995 and for the six-month periods then ended has
been derived from unaudited consolidated financial statements of the Company,
which, in the opinion of management, have been prepared on a basis consistent
with the audited consolidated financial statements of the Company and contain
all adjustments (consisting solely of normal recurring adjustments) necessary
for a fair presentation of the interim financial position and results. The
results of operations for such interim periods are not necessarily indicative
of the results of operations for any other interim periods or for the year as a
whole. See "ADDITIONAL INFORMATION" and "INCORPORATION BY REFERENCE."
<TABLE>   
<CAPTION>
                                                                     SIX MONTHS
                                                                        ENDED
                                YEAR ENDED SEPTEMBER 30,              MARCH 31,
                          ----------------------------------------  --------------
                           1991    1992    1993    1994     1995     1995    1996
                          ------  ------  ------  ------  --------  ------  ------
                                        (DOLLARS IN MILLIONS)
<S>                       <C>     <C>     <C>     <C>     <C>       <C>     <C>
STATEMENT OF OPERATIONS
 DATA:
Revenues................  $542.7  $430.5  $518.8  $700.8  $1,030.2  $544.6  $382.4
Cost of goods sold......   472.4   402.6   477.9   606.9     758.6   402.7   323.6
                          ------  ------  ------  ------  --------  ------  ------
  Gross profit..........    70.3    27.9    40.9    93.9     271.6   141.9    58.8
Selling, general and
 administrative
 expenses...............     9.7    10.3    25.5    24.4      31.7    16.0    16.1
SAR program expenses
 (benefit)..............      --      --      --    21.8      (2.8)    0.5     6.7
                          ------  ------  ------  ------  --------  ------  ------
  Income from
   operations...........    60.6    17.6    15.4    47.7     242.7   125.4    36.0
Interest and debt
 related expenses, net
 of interest income.....     6.1     8.4    22.4    22.1      14.6     9.7     3.2
Other (income) expense..      --      --      --    (2.6)       --      --     3.6
                          ------  ------  ------  ------  --------  ------  ------
  Income (loss) before
   taxes and
   extraordinary item...    54.5     9.2    (7.0)   28.2     228.1   115.7    29.2
Provision (benefit) for
 income taxes...........    17.7     4.7    (1.6)    9.1      75.0    37.4    10.0
                          ------  ------  ------  ------  --------  ------  ------
  Income (loss) before
   extraordinary item
   and change in
   accounting principle.    36.8     4.5    (5.4)   19.1     153.1    78.3    19.2
Cumulative effect of
 change in accounting
 for post-retirement
 benefits other than
 pensions...............      --   (10.4)     --      --        --      --      --
Extraordinary item, loss
 on early extinguishment
 of debt, net of tax....      --      --      --      --      (3.1)     --      --
                          ------  ------  ------  ------  --------  ------  ------
  Net income (loss).....  $ 36.8  $ (5.9) $ (5.4) $ 19.1  $  150.0  $ 78.3  $ 19.2
                          ======  ======  ======  ======  ========  ======  ======
PER SHARE DATA:
 Income (loss) before
  extraordinary item and
  change in accounting
  principle.............  $ 0.67  $ 0.08  $(0.10) $ 0.34  $   2.76  $ 1.41  $ 0.35
 Cumulative effect of
  change in accounting
  for post-retirement
  benefits other than
  pensions..............      --   (0.19)     --      --        --      --      --
 Extraordinary item.....      --      --      --      --     (0.06)     --      --
                          ------  ------  ------  ------  --------  ------  ------
 Net income (loss) per
  share on a fully
  diluted basis.........  $ 0.67  $(0.11) $(0.10) $ 0.34  $   2.70  $ 1.41  $ 0.35
                          ======  ======  ======  ======  ========  ======  ======
 Book value per share...  $ 2.04  $ 1.59  $ 1.27  $ 1.61  $   4.30  $ 2.93  $ 4.62
OTHER DATA:
Ratio of earnings to
 fixed charges(a).......     7.1x    1.8x     --     2.1x     11.9x    9.5x    5.2x
Deficiency of earnings
 to cover fixed charges.      --      --  $  7.3      --        --      --      --
BALANCE SHEET DATA:
Total assets............  $362.5  $608.5  $546.8  $580.9  $  609.9  $595.5  $614.5
Total long-term debt
 (including current
 portion)...............    72.6   300.2   263.9   192.6     103.6   151.4   124.2
Working capital.........    28.6    56.8    31.0    20.8      74.6    69.2    69.0
Stockholders' equity....   112.2    87.3    70.3    89.7     239.3   163.3   257.1
</TABLE>    
- --------
(a) For purposes of computing these ratios, earnings consist of income from
    continuing operations before income taxes and fixed charges (excluding
    capitalized interest). Fixed charges consist of interest expense on debt,
    amortization of financing costs, capitalized interest and the portion
    (approximately one-third) of rental expense that management believes is
    representative of the interest component of rental expense.
 
                                       14
<PAGE>
 
 
SUMMARY PRO FORMA FINANCIAL DATA
 
  The pro forma statement of operations presented below for the year ended
September 30, 1995 and the six months ended March 31, 1996 have been derived
from the unaudited pro forma financial statements included elsewhere herein,
and give effect to the Merger as if it had occurred on October 1, 1994. The pro
forma consolidated balance sheet data at March 31, 1996 presented below has
been derived from the unaudited pro forma consolidated balance sheet of
Chemicals and the Surviving Corporation included elsewhere herein and give
effect to the Merger as if it had occurred on March 31, 1996.
 
  The summary pro forma financial data do not necessarily represent what
Chemicals' or the Surviving Corporation's financial position and results of
operations would have been if the Merger had actually been completed as of the
dates indicated and are not intended to project Chemicals' and the Surviving
Corporation's financial position or results of operations for any future
period. The summary pro forma financial data should be read in conjunction with
the historical consolidated financial statements of the Company, the pro forma
financial statements of Chemicals and the Surviving Corporation, "SELECTED
HISTORICAL FINANCIAL DATA" and "PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS AND
OTHER INFORMATION."
 
  The pro forma adjustments were applied to the respective historical financial
statements to reflect and account for the Merger as a recapitalization.
Accordingly, the historical basis of the Company's assets and liabilities has
not been impacted by the Merger.
 
<TABLE>   
<CAPTION>
                                        CHEMICALS         SURVIVING CORPORATION
                                 ----------------------- -----------------------
                                                  SIX                     SIX
                                                MONTHS                  MONTHS
                                  YEAR ENDED     ENDED    YEAR ENDED     ENDED
                                 SEPTEMBER 30, MARCH 31, SEPTEMBER 30, MARCH 31,
                                     1995        1996        1995        1996
                                 ------------- --------- ------------- ---------
                                  (DOLLARS IN MILLIONS, EXCEPT PER SHARE DATA)
<S>                              <C>           <C>       <C>           <C>
STATEMENT OF OPERATIONS DATA:
Revenues.......................    $1,030.2     $ 382.4    $1,030.2     $ 382.4
Cost of goods sold.............       759.0       323.8       759.0       323.8
                                   --------     -------    --------     -------
Gross profit...................       271.2        58.6       271.2        58.6
Selling, general and
 administrative expenses.......        31.7        16.1        31.7        16.1
                                   --------     -------    --------     -------
 Income from operations........       239.5        42.5       239.5        42.5
Interest expense, net..........        64.7        31.8        78.4        38.7
Other (income) expense.........          --         3.6          --         3.6
                                   --------     -------    --------     -------
 Income from continuing
  operations before income
  taxes........................       174.8         7.1       161.1         0.2
Provision (benefit) for income
 taxes.........................        56.3         2.3        51.5        (0.1)
                                   --------     -------    --------     -------
  Income from continuing
   operations..................    $  118.5     $   4.8    $  109.6     $   0.3
                                   ========     =======    ========     =======
Income per share from
 continuing operations.........                            $  10.59     $  0.03
Book value per share...........                            $ (29.93)    $(28.21)
BALANCE SHEET DATA:
Total assets...................                 $ 646.7                 $ 649.7
Total long-term debt (including
 current portion)..............                   622.9                   722.9
Working capital................                    85.3                    85.3
Total stockholders' equity.....                  (194.9)                 (291.9)
OTHER DATA:
Ratio of earnings to fixed
 charges.......................         3.5x        1.2x        2.9x         --
Deficiency of earnings to cover
 fixed charges.................          --          --          --     $   1.1
</TABLE>    
 
                                       15
<PAGE>
 
                                  THE COMPANY
 
  The Company is one of North America's leading producers of selected
commodity petrochemicals used in the production of a wide array of consumer
goods and industrial products, and pulp chemicals used in paper manufacturing.
The Company ranks among the top three North American producers in terms of
rated production capacity for each of its primary products, including styrene,
acrylonitrile, acetic acid and sodium chlorate. Other products manufactured by
the Company include methanol, plasticizers, tertiary butylamine, sodium
cyanide and sodium chlorite. The Company manufactures all of its
petrochemicals at the Texas City Plant. The Company's pulp chemicals are
currently produced at four plants in Canada. A fifth plant, under construction
in Valdosta, Georgia, is scheduled to begin production in late 1996.
 
  In recent years, the Company has pursued a strategy of growth and product
diversification. In 1992, the Company acquired its pulp chemicals business
which has current sodium chlorate production capacity of 350,000 tons. In
1995, the Company began a three-year, $200 million capacity expansion and
upgrade program, which is approximately 50% complete. Through this program,
the Company will have expanded its total petrochemical production capacity by
approximately 1.4 billion pounds, including capacity additions of 200 million
pounds of styrene, 200 million pounds of acetic acid and 150 million gallons
(approximately 995 million pounds) of methanol. In addition, the Company is
expanding its sodium chlorate production capacity by 110,000 tons, or 30%, by
constructing a new facility in Valdosta, Georgia. Through this strategy, the
Company has sought to capitalize on the continuing secular growth in global
demand for its key products, while reducing its sensitivity to the cyclicality
of the markets for any particular product.
 
  Styrene. The Company is the third largest North American producer of styrene
monomer, a chemical intermediate utilized in the production of plastic and
synthetic rubbers used in packaging, housewares, automotive components,
luggage, toys and building products. The Company's styrene unit is one of the
largest in the world and has an annual rated production capacity of 1.7
billion pounds, following a recent debottlenecking, which represents
approximately 12% of total North American capacity. In fiscal 1995, the
styrene unit operated at an average utilization rate of 96% and generated
revenues of $467 million, which represented approximately 45% of the Company's
total revenues.
 
  Acrylonitrile. The Company is the second largest global producer of
acrylonitrile, the principal raw material for acrylic fibers used in textiles
and industrial applications. The Company's acrylonitrile unit has an annual
rated production capacity of 740 million pounds, which represents
approximately 21% of total North American capacity. In fiscal 1995, the
acrylonitrile unit operated at an average utilization rate of 96% and
generated revenues of $251 million, which represented approximately 24% of the
Company's total revenues.
 
  Acetic Acid. The Company is the third largest North American producer of
acetic acid, a product made from carbon monoxide and methanol. Acetic acid is
primarily used in the manufacture of intermediate products, such as vinyl
acetate monomer, which are used to produce various consumer products,
including adhesives, glue, cigarette filters and surface coatings. Following a
200 million pound capacity expansion completed in May 1996, the Company's
acetic acid unit has an annual rated production capacity of approximately 800
million pounds, which represents approximately 17% of total North American
capacity. In fiscal 1995, the acetic acid unit operated at an average
utilization rate of 107% and generated revenues of $94 million, which
represented approximately 9% of the Company's total revenues.
 
  Sodium Chlorate. Upon completion of its Valdosta, Georgia plant, the Company
will be the second largest North American producer of sodium chlorate, which
is converted to chlorine dioxide for use in the pulp bleaching process. The
Company's four sodium chlorate plants have an aggregate annual rated
production capacity of 350,000 tons, and the Valdosta, Georgia plant,
scheduled to begin production in late 1996, will increase the Company's total
annual capacity by 30% to nearly 460,000 tons. Following completion of the
Valdosta plant, the Company will account for approximately 22% of North
American sodium chlorate capacity. In addition, the Company's ERCO Systems
Group is the worldwide leader in the design, sale and technical service of
large scale chlorine dioxide generators, which are used to convert sodium
chlorate to chlorine dioxide.
 
                                      16
<PAGE>
 
Since the mid-1980s, North American demand for sodium chlorate has grown at an
average annual rate of approximately 10%, as pulp manufacturers are
substituting chlorine dioxide for elemental chlorine in bleaching applications
in anticipation of environmental regulations that would eliminate the use of
elemental chlorine in pulp manufacturing. In fiscal 1995, the Company's sodium
chlorate plants operated at a weighted average utilization rate of 97% and its
pulp chemicals business generated revenues of $144 million, which represented
approximately 14% of the Company's total revenues.
 
BUSINESS STRATEGY
   
  The Company's business strategy is to capitalize on its competitive market
position to take advantage of periods of tight supply and high prices and
margins for its primary products, which historically have occurred on a
cyclical basis, and to expand its production capacity to capture future growth
opportunities in the petrochemical and pulp chemical industries. Key elements
of this strategy are to: (i) maintain a competitive cost position in
petrochemicals by investing in new technology and equipment; (ii) pursue low
cost expansions in petrochemicals, such as its recent 30% expansion of acetic
acid capacity and construction of a world-scale 150 million gallon methanol
plant; (iii) pursue growth opportunities in pulp chemicals through the current
construction of additional capacity; (iv) continue to build strong industry
partnerships in petrochemicals through securing long-term supply contracts
with key customers; and (v) after the Merger, implement a more focused
acquisition strategy, targeting chemical businesses and assets which would
strengthen the Company's existing market positions, provide upstream or
downstream integration or produce complementary chemical products.     
 
                              THE SPECIAL MEETING
 
PURPOSE; RECORD DATE; VOTING AT THE SPECIAL MEETING
   
  The Special Meeting will be held on August [  ], 1996 at [      ] a.m.,
Central Time, at the [                                             ], Houston,
Texas [             ].     
   
  The purpose of the Special Meeting is to consider and vote upon a proposal
to approve and adopt the Merger Agreement, dated as of April 24, 1996 and as
amended as of June 11, 1996, between the Company and STX Acquisition (the
"Merger Agreement"). See "THE MERGER--Terms of the Merger." The Company does
not know of any matters other than those set forth herein which may come
before the Special Meeting. If any other matters are properly presented to the
Special Meeting for action, it is intended that the persons named in the proxy
will vote in accordance with their best judgment on such matters.     
   
  The Board has fixed the close of business on July [  ], 1996 as the Record
Date for the determination of stockholders entitled to notice of and to vote
at the Special Meeting or any adjournment or postponement thereof. On the
Record Date,          shares of Common Stock were outstanding and owned of
record by      persons (the "Record Stockholders").     
 
  All proxies in the enclosed form of proxy that are properly executed and
returned to the Transfer Agent at or prior to the Special Meeting will be
voted at the Special Meeting or any adjournment or postponement thereof in
accordance with the instructions thereon. All executed but unmarked proxies
will be voted FOR approval and adoption of the Merger Agreement and the
Merger.
 
  Stockholders have the right to dissent from the Merger Agreement and,
subject to certain conditions provided under Section 262 of the DGCL, to
receive payment for the fair value of their shares of Common Stock. See "THE
MERGER--Appraisal Rights of Dissenting Stockholders" and Annex C to this Proxy
Statement.
 
VOTES REQUIRED
 
  The presence, in person or represented by proxy, of a majority of the shares
of Common Stock entitled to vote at the Special Meeting is necessary to
constitute a quorum at the Special Meeting. Approval and adoption of the
Merger Agreement and the Merger requires, under Section 251 of the DGCL, the
affirmative vote of a
 
                                      17
<PAGE>
 
majority of the shares of Common Stock issued and outstanding on the Record
Date entitled to vote thereon. Only stockholders of record at the close of
business on the Record Date are entitled to notice of and to vote at the
Special Meeting or any and all adjournments and postponements thereof. As of
the Record Date, [           ] shares of Common Stock, held by approximately
[   ] holders of record, were issued and outstanding and entitled to vote at
the Special Meeting. Shares of Common Stock represented at the Special Meeting
by a properly executed, dated and returned proxy will be treated as present at
the Special Meeting for purposes of determining a quorum, without regard to
whether the proxy is marked as casting a vote or abstaining. Proxies relating
to "street name" shares that are properly executed and returned by brokers
will be counted as shares present for purposes of determining the presence of
a quorum, but will not be treated as shares having voted at the Special
Meeting as to the Merger Agreement and the Merger if authority to vote is
withheld by the broker (a "broker non-vote"). Abstentions will be recorded as
such by the Inspectors of Election for the Special Meeting. In light of the
treatment of abstentions and broker non-votes and the fact that the
affirmative vote required to authorize and adopt the Merger Agreement and the
Merger is a stated percentage of the total number of outstanding shares of
Common Stock on the Record Date and entitled to vote thereon, abstentions and
broker non-votes (as well as any other failure to vote shares of Common Stock)
will have the same effect as votes against the approval and adoption of the
Merger Agreement and the Merger. THE EFFECT OF FAILING TO PROPERLY EXECUTE AND
RETURN A PROXY CARD OR TO VOTE AT THE SPECIAL MEETING WILL BE THE SAME AS
VOTING AGAINST THE APPROVAL AND ADOPTION OF THE MERGER AGREEMENT AND THE
MERGER.
   
  Each of Messrs. Frank J. Hevrdejs, William C. Oehmig, Gordon A. Cain, J.
Virgil Waggoner, and Robert W. Roten entered into the Irrevocable Proxies with
STX Acquisition, pursuant to which each such stockholder individually appoints
STX Acquisition and certain of its officers as his proxy to call and attend
meetings of the stockholders of the Company, to execute written consents and
to vote the shares of Common Stock which such stockholder owns and is entitled
to vote at any meeting of the stockholders of the Company, provided that any
vote or consent taken under the authority of such proxy shall be solely for
the purposes of adopting and approving of the Merger and the Merger Agreement,
or rejecting any proposal for any other merger agreement or any other
transaction for the sale of the Company or its assets, or any other
transaction intended to frustrate or impair the right or ability of STX
Acquisition or the Company to consummate the Merger. Each Irrevocable Proxy
terminates upon the earlier of the Effective Time, the date of termination of
the Merger Agreement in accordance with its terms, or the date upon which
written notice of termination of the Irrevocable Proxy is given by STX
Acquisition to the stockholder who is a party to the Irrevocable Proxy. The
Irrevocable Proxies represent, in the aggregate, approximately 18% of the
outstanding Common Stock of the Company. A total of approximately 23.0% of the
outstanding Common Stock of the Company is beneficially owned by senior
officers and directors of the Company as a group. In addition, employees of
the Company, including the senior officers, beneficially own approximately
10.8% of the Company's outstanding Common Stock through the Company's ESOP.
Except for shares represented by the Irrevocable Proxies described above,
there are no commitments or understandings regarding how any of these shares
will be voted.     
 
ROLLOVER ELECTIONS
 
  A Rollover Election may be made by any person who is a record holder of
Common Stock on the Election Date, REGARDLESS OF WHETHER SUCH PERSON RETURNS A
PROXY OR VOTES FOR OR AGAINST THE APPROVAL AND ADOPTION OF THE MERGER
AGREEMENT OR ABSTAINS FROM VOTING AT THE SPECIAL MEETING. Rollover Elections
shall be made only by completing, executing and delivering the Form of
Election enclosed with this Proxy Statement, together with the Certificates,
duly endorsed by the record holder representing the shares of Common Stock
subject to the Rollover Election, to KeyCorp Shareholder Services (the
"Exchange Agent") by 5:00 p.m., New York Time, on the Election Date. All
Rollover Elections in the enclosed Form of Election that are properly executed
and returned to the Exchange Agent will be honored by the Company, subject to
pro rata reduction among the stockholders making Rollover Elections to the
extent necessary to reduce the number of Rollover Shares to the Maximum
Rollover Amount. Any Rollover Election may be revoked by any stockholder who
has given written notice received on or before the Election Date by the
Exchange Agent. Shares of Common Stock as to which
 
                                      18
<PAGE>
 
Rollover Elections have not been made or have been revoked or which exceed the
Maximum Rollover Amount will automatically be converted into the right to
receive the Cash Payment.
 
REVOCATION AND USE OF PROXIES; SOLICITATION
   
  Shares of Common Stock which are represented by properly executed, dated and
returned proxies, unless such proxies shall have previously been properly
revoked, will be voted in accordance with the instructions indicated in such
proxies. If no contrary instructions are indicated, such shares will be voted
FOR approval and adoption of the Merger Agreement and in the discretion of the
proxy holder as to any other matter which may properly come before the Special
Meeting. Any proxy which votes against approval and adoption of the Merger
Agreement will be so counted and will not be used to vote for any adjournment
of the Special Meeting. Any other matter which may properly come before the
Special Meeting at which a quorum is present for such purpose requires the
affirmative vote of at least a majority of the shares of Common Stock present,
in person or by proxy. A stockholder who has given a proxy may revoke it at
any time prior to its use at the Special Meeting by delivering a written
notice of revocation of the proxy being revoked, or by submission of a
properly executed proxy bearing a later date than the proxy being revoked, to
the Secretary of the Company at 1200 Smith Street, Suite 1900, Houston, Texas
77002-4312, or by voting the Common Stock covered thereby in person at the
Special Meeting.     
 
SOLICITATION; FEES AND EXPENSES
 
  In addition to soliciting proxies by mail, officers, employees and agents of
the Company, without receiving additional compensation therefor, may solicit
proxies personally or by telephone, telegram or other forms of wire or
facsimile communication. The Company has also retained Georgeson & Company,
Inc. as its proxy solicitor in connection with the Special Meeting. The fee
for such services will not be more than approximately [      ] plus out-of-
pocket expenses. Any questions or requests for assistance regarding proxies
and related materials may be directed in writing to Georgeson & Company, Inc.
at          or by telephone at [(   )        ]. The Company will bear the cost
of the Special Meeting and of soliciting proxies therefor, including the
expense of preparing and printing this Proxy Statement and the proxies
solicited hereby and any filing fees incurred in connection with this Proxy
Statement, including the reasonable expenses incurred by brokerage houses,
custodians, nominees and fiduciaries in forwarding proxy material to the
beneficial owners of shares of Common Stock. Other fees and expenses incurred
in connection with the Merger, including certain filing fees, will be borne by
either the Company or STX Acquisition.
 
                                SPECIAL FACTORS
 
BACKGROUND
          
  During the period of January through March 1994, Mr. Gordon A. Cain, the
Chairman of the Company's Board of Directors, initiated contact with two
prospective purchasers within the industry relating to a possible sale or
merger of the Company. These contacts did not result in any further
discussions until October 1994, when Messrs. Cain and J. Virgil Waggoner, the
Company's President and Chief Executive Officer, renewed contacts with the two
prospective industry purchasers with whom informal contact continued through
the end of the year. There was also brief contact with a third industry
purchaser initiated by Mr. Cain in October 1994, which did not lead to further
substantive discussions relating to a possible sale or merger of the Company.
       
  Beginning in 1995, the Company engaged in discussions with the same two
prospective industry purchasers contacted in October 1994, both of whom
conducted an initial due diligence document review of the Company.
Negotiations proceeded with both prospective purchasers which, in the case of
one purchaser, proceeded to a draft merger agreement. However, all
negotiations were terminated by the prospective purchasers by early March
1995. Both prospective purchasers declined to discuss their reasons for
discontinuing negotiations. The Company then determined to discontinue active
pursuit of a sale.     
 
 
                                      19
<PAGE>
 
   
  In early October 1995, Mr. Cain was advised by TSG of its interest in a
possible purchase of the Company, which Mr. Cain reported to the Company's
Board at its October 25, 1995 meeting. Approximately one week prior to the
October 25, 1995 Board meeting, Mr. Frank J. Hevrdejs, a principal of TSG,
telephoned Mr. Waggoner to indicate that TSG was interested in making a
proposal for the purchase of the Company; while Mr. Hevrdejs indicated that no
offer was being made, he indicated a possible price level of $11 per share.
       
  Representatives of TSG and the Company met at TSG's request on October 31,
1995 at the offices of TSG to discuss TSG's intention to form an investor
group in conjunction with Unicorn to purchase the Company. The TSG
representatives attending the meeting included individuals with CS First
Boston Corporation, TSG's investment advisor, Chase Securities Inc. and Credit
Suisse (both financing sources for TSG) and principals of TSG, including Mr.
Hevrdejs, Ms. Susan Rheney, Mr. Hunter Nelson and Mr. William C. Oehmig. A
partner of Andrews & Kurth, L.L.P., counsel to TSG, also attended.
Representatives of the Company included Mr. F. Maxwell Evans, the Company's
Vice President and General Counsel, Mr. Waggoner and Mr. Jim P. Wise, the
Company's Vice President-Finance and Chief Financial Officer. Representatives
of Chemical Securities, Inc. also attended the meeting with the Company,
although Chemical Securities, Inc. at no time was engaged by the Company in
connection with the transaction or otherwise. A partner of Piper & Marbury
L.L.P ("Piper & Marbury") also attended as counsel to the Company.     
   
  At the meeting, TSG made a detailed presentation for the possible
acquisition of the Company at a price of $11 per share, including the
anticipated timing and financing structure. TSG suggested the execution of a
letter of intent binding the Company to negotiate exclusively with TSG to be
followed by the execution of a definitive merger agreement. Immediately
following the presentation, TSG was advised by the Company that it could not
consider any negotiations for a purchase of the Company or any other
transaction until the matter was fully considered by the Board.     
   
  Following the October 25 Board meeting, Mr. Wise, at Mr. Waggoner's
direction, contacted a potential industry purchaser, which indicated interest
in a possible transaction. Contact was also made by Mr. Waggoner with another
industry purchaser, and on November 2, 1995, Messrs. Cain, Waggoner and Wise
met with officers of one of the potential industry purchaser to discuss a
possible transaction. After discussions with Mr. Waggoner, Mr. James J.
Kerley, a director of the Company, also contacted a potential financial
purchaser, and on November 8, Messrs. Waggoner, Kerley and Wise met with
principals of the potential financial purchaser to discuss a possible
transaction. Both meetings were preliminary in nature, and relatively little
substantive information was exchanged. Each of the three potential purchasers
commenced some due diligence, and participated in the preliminary phases of
the auction process coordinated by Lazard as described below.     
   
  The Board met telephonically on November 10, 1995. The October 31, 1995
meeting with TSG and the Company's other contacts with all potential
purchasers were reported to the Board. Mr. Cain then suggested to the Board
that because of his previous association with TSG, a Special Committee of the
Board should be appointed to independently consider and evaluate the possible
sale of the Company and all other transactions and strategies to maximize
shareholder value. Mr. Waggoner also reported that while senior management of
the Company might be asked to participate in any purchase by a financial
buyer, management would not become an independent bidder. A representative of
Piper & Marbury discussed with the Board the role of the Special Committee and
the importance of the Special Committee independently evaluating the Company's
alternatives. The Board also agreed that the Special Committee should retain a
financial advisor and legal counsel and would have the authority to make its
own arrangements in that connection. The Board also agreed that the Special
Committee would consist of the outside members of the Board other than Mr.
Cain. Messrs. Knowland, Portal, McMinn, Pizzitola and Kerley were then
appointed to the Special Committee and the members of the Special Committee
thereafter selected Mr. Kerley to serve as Chairman of the Special Committee.
The Board was aware of Mr. McMinn's previous investment participation with TSG
in several transactions, but decided to include him on the Special Committee
because of his experience in the chemicals industry, his long-term association
with the Company and its Texas City plant and his geographic proximity to the
Company's offices. In addition, the residence of Messrs. Portal and Knowland
outside the United States in Europe made it desirable to have at least     
 
                                      20
<PAGE>
 
   
three Special Committee members available in the United States to constitute a
majority of the Special Committee. Finally, four of the five Special Committee
members had no relationships with TSG and could control the Special Committee.
       
  The Special Committee of the Board met on November 20 for the purpose of
selecting outside counsel and a financial advisor for the Special Committee.
After interviewing Piper & Marbury and another law firm, the Special Committee
retained Piper & Marbury as counsel to the Special Committee. The Special
Committee also interviewed four investment banking firms, and elected to
retain Lazard Freres & Co. LLC ("Lazard") as financial advisor to the Special
Committee. The Special Committee was guided in this decision by (i) Lazard's
experience and reputation in the chemicals industry, (ii) its perception that
Lazard was not as transactionally oriented as the other firms interviewed and
would be willing to thoroughly investigate a strategic alternative in addition
to a possible sale of the Company and (iii) its conclusion that the Lazard
presentation was superior to the presentations given by the other firms
interviewed. Mr. Pizzitola explained to the other members of the Special
Committee that while he had retired as an active principal of Lazard, he was
designated by Lazard as a Limited Managing Director. Mr. Pizzitola and the
Special Committee agreed that he not attend the presentation by Lazard or vote
on the selection of the financial advisor. Mr. Pizzitola further agreed in
writing that his compensation from Lazard would not in any way be affected by
the Special Committee's retention of Lazard as its financial advisor. Mr.
Pizzitola advised the Special Committee that he had neither operational nor
management responsibility at Lazard, and would not participate in Lazard's
work for the Special Committee, the Board or the Company except as a member of
the Special Committee and the Board. Because of these factors, and the absence
of any material financial interest of Mr. Pizzitola in any possible outcome of
the Special Committee's assignment, the Special Committee concluded that
Lazard could be viewed as independent.     
   
  Following the conclusion of the Special Committee's meeting on November 21,
Mr. Kerley and representatives of Piper & Marbury met with representatives of
Lazard to establish a timetable for evaluation of the Company's strategic
alternatives. The Special Committee also instructed the Company's management
and the Board that all contacts with potential purchasers were to be
coordinated through Lazard.     
       
          
  The Special Committee met with Lazard on December 18, 1995. Lazard described
a possible range of values for the Company under different alternatives,
including a sale of the Company, a recapitalization and the pursuit by the
Company of certain operating strategies. The Special Committee and Lazard
discussed the relative merits, and resulting value ranges, of the pursuit of
internally managed alternatives, as opposed to a sale of the Company. The
Special Committee took into account the Company's $200 million capital program
in evaluating the pursuit of internally managed operating strategies. The
principal components of the program included the construction of the Valdosta
chlorate plant ($55 million), construction of a methanol plant ($33 million)
and ongoing maintenance projects directed at quality and cost improvements
($112 million). While the Valdosta plant and the methanol plant would increase
the Company's production capacity and output and possibly enhance the
Company's long-term profitability, both chlorate and methanol pricing is
cyclical and heavily influenced by market capacity and demand. The Special
Committee concluded that the long-term value to shareholders possibly
achievable through internally managed strategies may be outweighed by the
immediate value to shareholders of a sale at that time because of the
significant risks that internally managed strategies would not achieve the
intended results. To further evaluate the alternatives available to the
Company, the Special Committee authorized a test of the market on a broad
basis to determine the level of interest in a possible sale of the Company,
and an ongoing review of all strategic alternatives. The Special Committee
also reviewed Mr. Kerley's summary of his and Mr. Knowland's meeting with
senior members of the Company's management (which had occurred on the
preceding Sunday, December 17) in which each management member was asked to
discuss his view of the Company's possible operating strategies, and the
possibility of the Company initiating a leveraged self-recapitalization and
share repurchase program. Management members were not asked about their
interest in participating in any leveraged buyout.     
 
  The Special Committee meeting of December 18 was followed by a meeting with
the full Board on the same day. The Company's strategic alternatives as
discussed by the Special Committee and Lazard were discussed with the Board,
and the relative merits of different strategic alternatives were again
discussed. In
 
                                      21
<PAGE>
 
connection with a further market test of interest in a purchase of the
Company, the Board discussed a list of potential purchasers, both strategic
and financial, and the four parties that had already conducted a preliminary
due diligence review. The Board approved the Special Committee's
recommendation that a market test be conducted, and that Lazard be permitted
to solicit preliminary bids for the purchase of all or parts of the Company
and to compare the value indicated by the market test against the Company's
ability to realize value for its stockholders by pursuing alternatives other
than a sale. Lazard then identified companies that Lazard believed would be
likely candidates for acquiring the Company, worked with management of the
Company and its counsel in preparing a Confidential Offering Memorandum (the
"Memorandum") for delivery to potential acquirors, prepared an analysis of the
Company and the market for its securities to provide a basis for evaluating
any offers received by the Company, and assisted management of the Company to
develop an auction process in the event the Special Committee ultimately
decided that a sale of the Company was in the best interests of the Company
and its stockholders. The auction process would also involve several steps,
including the identification of potential acquirors, an informal approach to
the potential acquirors to determine their interest in participating in the
process, the delivery of the Memorandum to those potential acquirors which
indicated a desire to participate in the process, the receipt of preliminary
indications of interest from the potential acquirors, detailed on-site due
diligence by potential acquirors with indications of interests of a magnitude
deemed acceptable to the Board, and the receipt of preliminary bid proposals.
   
  Between December 18, 1995 and January 26, 1996, Lazard, with the
participation of Piper & Marbury and members of the Special Committee prepared
a confidential memorandum for distribution to interested parties, oversaw due
diligence, and generally supervised the process agreed upon by the Special
Committee for the solicitation of indications of interest. During this period,
and throughout the entire process as supervised by the Special Committee, TSG
was treated in the same manner as all other interested parties admitted to the
process. TSG was not advised by Lazard or the Special Committee of the details
of any competing bid at any time in the process.     
   
  On January 26, 1996, members of the Special Committee and the Board met with
Piper & Marbury and Lazard to review preliminary bids received. TSG and
Unicorn presented a preliminary bid of $11.25 per share. After reviewing the
preliminary bids received and the conditional nature of many of those bids,
the Special Committee determined with the advice of Lazard that the market
value of the Company could best be determined through an expansion of the bid
process and a public announcement. It was decided that the bid process should
be expanded, and that Lazard should solicit additional bids through an auction
process from a broad range of financial and industrial buyers. On January 29,
1996, the Company publicly announced that the Company was engaged in an
examination of its strategic alternatives, including a possible sale of the
Company, and that the Company had engaged in preliminary conversations with
several potential bidders. The process continued with several additional
bidders who conducted due diligence reviews and site visits to the Company's
plants.     
   
  On February 22, 1996, the Special Committee met to review the status of
potential bids for purchase of part or all of the Company. The Committee also
reviewed with Lazard its recommendations as to how the balance of the process
of reviewing the Company's alternatives should be conducted. The Special
Committee reviewed the status of bidders for the Company at that point, and
the fact that the January 29, 1996 announcement had resulted in Lazard's
receipt of indications of interest from a number of additional potential
acquirors. Because of the late entry of certain qualified potential bidders,
the Special Committee accepted Lazard's recommendation that the auction
process be continued past the original deadline for submission of final bids
which had been fixed at February 29, 1996. The Special Committee decided that
final bids would be accepted until March 29, 1996, and all potential acquirors
then participating in the process were so advised.     
 
  The Special Committee met at the offices of Lazard on April 1 and 2, 1996 to
review the status of bids received for the purchase of all or parts of the
Company. Lazard reviewed with the Special Committee the bid solicitation
process that had been followed, and the list of potential bidders that had
been in contact with Lazard. Lazard reported that firm bids had been received
only from TSG and Unicorn for the purchase of the Company as a whole, and from
two other bidders for the purchase of the pulp chemicals and the
petrochemicals operations
 
                                      22
<PAGE>
 
   
of the Company, respectively. The bids were then reviewed in detail, including
respective financial terms, demonstrated financing capabilities and other
conditions to closing. Lazard pointed out that the TSG/Unicorn bid and the bid
for the petrochemicals business of the Company were conditioned on financing,
and that, although the bid for pulp chemicals was not conditioned on
financing, the bidder, as a practical matter, would have to raise significant
financing to conclude a transaction. The offer received for the petrochemical
operations represented a net value (after deductions for debt and other
liabilities) of $272.4 million. A total of $313 million was offered for the
pulp chemical operations. The pulp chemicals offer was subsequently increased
to $330 million. The combined value of the two bids equalled $602.4 million
representing a value of approximately $10.81 per share on a combined basis.
The total value indicated did not take into account the negative income tax
consequences to the Company of a separate sale of the pulp chemicals
operations, nor were certain other liabilities addressed. All material
elements of the bids received were fully discussed. Lazard also discussed with
the Special Committee the possibility of the Company engaging in alternative
transactions, including a self-recapitalization.     
   
  Following the Special Committee's meeting, the Board met on April 2 to
review those items discussed by the Special Committee, and to hear the Special
Committee's report and recommendation. Representatives of Lazard reviewed all
of the bids received, the history of the bidding process and the alternatives
available to the Company, including a self-recapitalization. The terms of the
bids were fully discussed. The Board agreed to accept the Special Committee's
recommendation that the $12 per share bid presented by TSG and Unicorn was the
best current alternative for maximizing shareholder value. The Special
Committee recommended to the Board, and the Board agreed, to pursue a
transaction with TSG and Unicorn on the basis of their March 29 bid. It was
also agreed that the Company, with the assistance of Lazard, should take
preliminary steps to pursue a recapitalization in the event that ongoing
negotiations with TSG and Unicorn for a definitive transaction were
unsuccessful.     
 
  The Special Committee next met by telephone on Tuesday, April 9, 1996.
Lazard reviewed with the Special Committee the status of ongoing discussions
with two additional possible bidders who had not made a bid by the March 29
deadline, but had indicated interest in possibly making a bid. Lazard also
reported that the bidder for pulp chemicals had increased its price, but that
the bidder for petrochemicals had not. The combined value of the two bids was
still inferior to the $12 per share bid received from TSG and Unicorn. The
Special Committee also concluded that since bids had not been received from
the two additional possible bidders, the auction process had not resulted in
further material developments. Mr. Kerley suggested to the Special Committee
that he and Lazard meet with representatives of TSG and Unicorn and their
financing sources to discuss financing and other issues relative to possibly
improving the terms of their bid.
   
  On the day following the April 9 telephonic meeting of the Special
Committee, Mr. Kerley and representatives of Lazard met with representatives
of TSG and Unicorn to discuss the financing for the TSG/Unicorn bid. TSG and
Unicorn also agreed that their offer would be modified to allow public
stockholders (other than those stockholders subject to the Inducement
Agreement) to receive cash of $12 a share in lieu of being required to retain
any stock. This modification was in response to Mr. Kerley's insistence on
behalf of the Special Committee that any transaction allow any public
stockholder who desired it to receive all cash. In the two weeks following
that meeting, the advisors of the Special Committee went forward with the
negotiation of a definitive Merger Agreement with TSG/Unicorn. This included
the exchange and negotiation of a number of Merger Agreement drafts, and a
number of drafting and negotiating meetings in Houston, Texas at the offices
of Andrews & Kurth L.L.P., counsel to TSG and Unicorn. A number of material
terms of the TSG/Unicorn bid were further negotiated, including financing
conditions, provisions of the fiduciary out and non-solicitation sections of
the Merger Agreement, the Tag-Along Agreement and provisions allowing the
Company to terminate the contract if TSG and Unicorn were unable to secure
certain financing commitments by specified dates. Preliminary merger agreement
drafts were circulated to the Company's Board for its review.     
 
  On April 15, the Company received a letter, by facsimile, from the Huntsman
Corporation ("Huntsman") which provided a preliminary indication of interest
in acquiring the Company for $12 per share. The indication of interest was
subject to due diligence and board approval. With negotiations with TSG and
Unicorn at a final
 
                                      23
<PAGE>
 
   
stage, and after indications from Huntsman that due diligence would require
several weeks, the Special Committee determined that it would not be in the
best interests of stockholders to jeopardize a definitive offer in hand in
favor of a proposal that would require extensive due diligence and time-
consuming negotiations and had no assurance of resulting in a higher price.
The Special Committee also determined that the $8 million break up fee
contemplated in the draft merger agreement payable to STX Acquisition upon
acceptance of another offer was not at a level high enough to deter any
possible interested party and should allow it to consider and accept any
materially better offer after execution of the Merger Agreement. The Company's
pending litigation with Huntsman was not a material consideration in the
Special Committee's decision not to pursue the Huntsman indication of
interest. Huntsman withdrew its indication of interest on April 29, 1996.     
 
  A draft of the merger agreement was substantially completed on April 23,
1996. The Special Committee met on the morning of April 24 and unanimously
decided to recommend approval of the merger agreement to the Board. The Board
also met on the morning of April 24 to consider authorizing the Company to
enter into the merger agreement. At the Board meeting, Lazard discussed its
fairness opinion which was delivered to the Board at the meeting, and reviewed
discussions with TSG and Unicorn and the other actual or potential bidders
subsequent to the Board's April 2 meeting. Counsel to the Special Committee
discussed the principal terms of the merger agreement. Lazard also presented a
summary of the various financial analyses it had performed and advised the
Board that the price offered by TSG and Unicorn of $12 per share compared
favorably with the range of values determined from its analyses. After further
discussion, the Merger Agreement and transactions contemplated thereby were
unanimously approved by the Board.
 
  Following the April 24 Board meeting, there was further negotiation among
representatives of TSG, Unicorn and the Company. The Merger Agreement was
executed the following day, April 25, 1996.
 
FAIRNESS OF THE MERGER
   
   In determining to approve and recommend the Merger Agreement, the Special
Committee and the Board considered a number of factors, including the
following (which constitute all material factors considered): (i) historical
and current market prices of the Company's Common Stock and the fact that the
$12 per share price in the Merger represented a premium of approximately 30%
over the closing sales price for the Common Stock as reported on the NYSE on
January 26, 1996, the last trading day prior to the public announcement by the
Company announcing that the Company was considering its strategic
alternatives, including a possible sale of the Company and the fact the Common
Stock had not traded above $12 per share since July 12, 1995 through the
Company's January 29, 1996 public announcement and had ranged widely in price
from a high and low of $14 1/8 and $7 3/8 in calendar 1995 to a high and low
of $13 1/8 and $7 7/8 in calendar 1996; (ii) presentations of Lazard at
numerous meetings of the Special Committee and the opinion of Lazard dated
April 24, 1996 to the effect that, based upon and subject to various
considerations set forth in such opinion, as of the date of such opinion, the
consideration to be received by holders of the Common Stock of the Company in
connection with the Merger was fair to such holders (other than TSG or any of
its affiliates) from a financial point of view; (iii) the Board's belief,
based upon the sale process that was conducted, that alternative acquisition
transactions were not likely to provide values to the stockholders of the
Company in excess of the $12 per share cash price in the Merger and that
further delay in selecting a purchaser would risk loss of the proposal from
TSG and Unicorn; (iv) that the Merger Agreement permits the Company to
terminate the Merger Agreement or take certain other actions after payment of
an $8 million breakup fee to STX Acquisition if any person has proposed an
Acquisition Transaction for the Company and the Board reasonably determines in
good faith, based on the advice of its outside, independent financial advisor
and legal advisor that such action, including termination of the Merger
Agreement, would result in a more favorable Acquisition Transaction and that a
failure to do so constituted a significant risk of breach of fiduciary duty to
the Company's stockholders; (v) the Board's belief that any recapitalization
transaction that might achieve values to the stockholders of the Company equal
to or in excess of the $12 per share cash price in the Merger would allow a
share repurchase of only approximately 60% of the Company's outstanding
shares, require the Company to incur significant indebtedness and result in
outstanding Common Stock after a share repurchase which could have a trading
range below $12 per share; (vi) information with respect to the financial
condition, results of operations, business and prospects of the Company,
including     
 
                                      24
<PAGE>
 
   
the prospects of the Company if it were to remain independent, and current
industry, economic and market conditions; (vii) the nature of the financing
commitments and highly confident letters with respect to the Merger, including
the institutions providing the commitments and the conditions to the
obligations of such institutions to fund such commitments (see "THE MERGER--
Source and Amount of Funds"); (viii) the fact that in the Merger stockholders
have the right to receive cash and/or Rollover Shares (subject to proration
under certain circumstances); (ix) the terms and conditions of the Merger
Agreement, including the fact that the Merger Agreement does not include a due
diligence condition to the consummation of the Merger; and (x) the likelihood
that required state, federal and Canadian regulatory approvals would be
obtained. The Special Committee and Board also specifically took into
consideration the possibility that the pursuit of long-term internally managed
strategies, including a recapitalization, might yield long-term values in
excess of the present value of $12 in cash per share. It was concluded that
the risks of not realizing long-term values in excess of $12 per share
(particularly in light of the inherent unreliability of forecasting for the
Company and the industry) were outweighed by the immediate realization of $12
per share in cash and the opportunity for shareholders who were so inclined to
continue an investment in the Company with Rollover Shares. Although the
senior officers and directors of the Company will have an opportunity to elect
to retain Rollover Shares in the same fashion as other shareholders, no senior
officer or director of the Company other than Mr. Robert O. McAlister, Vice
President--Human Resources, will be participating in the Equity Private
Placement. The Special Committee did not consider the interests of the senior
officers and directors of the Company in the Merger except to the extent such
interests were aligned with the interests of shareholders generally. The
Special Committee did not believe it necessary to update the Lazard fairness
opinion.     
   
  The Special Committee's decision not to pursue the April 15, 1996 Huntsman
indication of interest (received some 2 1/2 months after the Company's January
29, 1996 announcement) was based upon a number of factors including: (i) the
Special Committee's conclusion that the Huntsman indication of interest was
not a definitive offer, (ii) subsequent indications from Huntsman that due
diligence could be time consuming and extensive with no assurance of continued
interest, (iii) the possibility that the proposed Huntsman price could be
decreased, as well as increased, following due diligence, (iv) the possibility
that the TSG/Unicorn offer would be jeopardized or withdrawn, with no
subsequent assurance that any agreement would be concluded with Huntsman, (v)
its conclusion that the $8 million breakup fee was not material to any bidder,
including Huntsman, who chose to pursue a transaction after the Merger
Agreement was executed (on April 26, 1996 the Company filed a Current Report
on Form 8-K which included a copy of the Merger Agreement), (vi) its further
conclusion that an executed Merger Agreement at $12 per share which preserved
the Company's ability to accept a materially higher offer was clearly
preferable to the pursuit of an indication of interest which was not an offer
and which could materially delay or prevent a definitive agreement at $12 per
share, and (vii) TSG's and Unicorn's indication to the Company that their
offer would be withdrawn if a definitive agreement was not executed by April
25, 1996.     
   
  The foregoing discussion represents the material factors considered and
given weight by the Board but is not intended to be exhaustive. In view of the
variety of facts considered in connection with its evaluation of the Merger,
the Board did not find it practicable to and did not quantify or otherwise
assign relative weight to the specific factors considered in reaching its
determination. In particular, the Board noted that the $12 per share offered
by TSG and Unicorn was lower than the expected case in certain of Lazard's
valuations, but determined that certain other factors, particularly including
the value of the Company indicated by the auction conducted by Lazard, should
be given greater weight than such valuations. In addition, individual members
of the Board may have given different weight to different factors.     
 
PURPOSE AND STRUCTURE OF THE TRANSACTION
 
  The purpose of the Merger is to maximize stockholder value. In pursuing this
objective, the Board considered various alternatives, including a sale of the
Company, a recapitalization and the pursuit by the Company of certain
operating strategies. In approving the Merger, the Board took into account the
Company's dependence on adequate raw material supply, lack of product
diversity, lack of downstream integration, strategic size relative to its
competition and the resulting impact of these factors on long-term stockholder
value. See "SPECIAL FACTORS--The Company's Business after the Merger." The
Company further believes that the
 
                                      25
<PAGE>
 
public market has undervalued the Common Stock of the Company, as indicated by
the premium of the Cash Payment over the trading prices of the Common Stock
prior to the Company's January 29, 1996 announcement of its examination of a
possible sale of the Company.
   
  The Special Committee considered the issue of whether it was more desirable
from the standpoint of maximizing shareholder value to approve the proposed
Merger, or to remain independent and seek to increase shareholder value
through future operations or a future sale of the Company. In this analysis,
the Special Committee considered management's expected case and downside case
forecasts for each of the Company's two primary operating businesses, the
historical cyclicality of the Company's business and the potential impact of a
business downturn on the results of operations of the Company, and the risk
that the Company's actual results might not meet the expected, or downside,
forecasts taking into account the inherent unreliability of projections and
forecasts for the Company and the industry. The Special Committee also took
into account TSG's and Unicorn's indication that their offer would be
withdrawn by April 25, 1996 if the Merger was not approved and a Merger
Agreement executed, and the possibility that given the results of the
Company's sale process, stockholders might not receive a comparable value
through another sale or pursuit of other strategic alternatives. See "--
Opinion of Financial Advisor."     
 
  The Special Committee and the Board ensured that the Merger was structured:
(i) to permit the Company to terminate the Merger Agreement or take certain
other actions after payment of an $8 million breakup fee to STX Acquisition if
any person proposed an Acquisition Transaction for the Company and the Board
reasonably determined in good faith, based on the advice of its outside,
independent financial advisor and legal advisor that such action, including
termination of the Merger Agreement, would result in a more favorable
Acquisition Transaction and that failure to do so constituted a significant
risk of breach of fiduciary duty to the Company's stockholders; and (ii) to
give the Company's stockholders the right to receive cash and/or Rollover
Shares, subject to proration under certain circumstances. The Special
Committee and the Board recognized that although the Merger is not structured
to require the approval of the unaffiliated stockholders of the Company,
appraisal rights are available to stockholders who have not voted in favor of
the Merger and who have otherwise properly exercised their rights for
appraisal.
   
  Because of the appointment of the Special Committee and the engagement of
its outside, independent financial advisor and legal advisor, the Board did
not appoint an unaffiliated representative, other than the Special Committee,
to act solely on behalf of unaffiliated stockholders, for the purpose of
negotiating the terms of the Merger Agreement or preparing a report concerning
the fairness of the Merger.     
 
RECOMMENDATION OF THE BOARD
   
  On April 24, 1996, the members of the Special Committee unanimously
recommended that the Board approve the Merger Agreement. Later that day, the
Board unanimously approved the Merger Agreement and the transactions
contemplated thereby, including the Merger, and determined that the Merger is
fair to, and in the best interests of, holders of the Common Stock. THE BOARD
UNANIMOUSLY RECOMMENDS THAT THE COMPANY'S STOCKHOLDERS VOTE FOR THE APPROVAL
AND ADOPTION OF THE MERGER AGREEMENT. All members of the Company's executive
management support the Merger, but no officer of the Company has made a formal
recommendation in support of or opposed to the Merger. Certain members of the
Board and of management of the Company have certain interests which may
present them with potential conflicts of interest in connection with the
Merger. See "THE MERGER--Interests of Certain Persons in the Merger."     
 
OPINION OF FINANCIAL ADVISOR
 
  Lazard has delivered its written opinion to the Special Committee dated
April 24, 1996, to the effect that, based upon and subject to various
considerations set forth in such opinion, as of the date of such opinion the
consideration to be received by the holders of the Common Stock of the Company
in connection with the Merger was fair to such holders (other than TSG or any
of its affiliates) from a financial point of view. No limitations were imposed
by the Special Committee upon Lazard with respect to the investigations made
or the procedures followed by Lazard in rendering its opinion.
 
                                      26
<PAGE>
 
  THE FULL TEXT OF THE OPINION OF LAZARD DATED APRIL 24, 1996, WHICH SETS
FORTH THE ASSUMPTIONS MADE, MATTERS CONSIDERED AND LIMITS ON THE REVIEW
UNDERTAKEN, IS ATTACHED AS ANNEX B TO THIS PROXY STATEMENT AND IS INCORPORATED
HEREIN BY REFERENCE. THE COMPANY'S STOCKHOLDERS ARE URGED TO READ SUCH OPINION
CAREFULLY AND IN ITS ENTIRETY. LAZARD'S OPINION WAS DIRECTED ONLY TO THE
FAIRNESS, FROM A FINANCIAL POINT OF VIEW, OF THE CONSIDERATION TO BE RECEIVED
BY THE STOCKHOLDERS OF THE COMPANY, WAS FOR THE INFORMATION OF THE SPECIAL
COMMITTEE, AND DOES NOT CONSTITUTE A RECOMMENDATION TO ANY STOCKHOLDER OF THE
COMPANY AS TO HOW SUCH STOCKHOLDER SHOULD VOTE OR WHAT FORM OF MERGER
CONSIDERATION SUCH STOCKHOLDER SHOULD ELECT TO RECEIVE. THE SUMMARY OF THE
OPINION OF LAZARD SET FORTH IN THIS PROXY STATEMENT IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO THE FULL TEXT OF SUCH OPINION.
 
  In arriving at its opinion, Lazard, among other things, (i) reviewed the
financial terms of the Merger Agreement; (ii) analyzed certain historical
business and financial information relating to the Company, including the
Annual Reports to Stockholders and Annual Reports on Form 10-K of the Company
for the five fiscal years ended September 30, 1995 and the Quarterly Report on
Form 10-Q of the Company for the quarter ended December 31, 1995; (iii)
reviewed various financial forecasts and other data provided to Lazard by the
Company relating to the Company's businesses; (iv) held discussions with
members of the senior management of the Company with respect to the businesses
of the Company and the strategic objectives of the Company; (v) reviewed
public information with respect to certain other companies in lines of
businesses Lazard believed to be generally comparable to the businesses of the
Company; (vi) reviewed the financial terms of certain business combinations
involving companies in lines of businesses Lazard believed to be generally
comparable to those of the Company, and in other industries generally; (vii)
reviewed the historical stock prices and trading volumes of the Company's
Common Stock; and (viii) conducted such other financial studies, analyses and
investigations as Lazard deemed appropriate.
 
  In connection with its review, Lazard relied upon the accuracy and
completeness of the financial and other information provided to it by, among
others, the Company, and did not assume any responsibility for any independent
verification of such information or any independent valuation or appraisal of
any of the assets or liabilities of the Company, nor was Lazard provided with
any such valuation or appraisal. With respect to financial forecasts, Lazard
assumed that such financial forecasts were reasonably prepared on bases
reflecting the best available estimates and judgments of the Company as to the
future financial performance of the Company. Lazard assumed no responsibility
for and expressed no view as to such forecasts or the assumptions on which
they were based.
   
  The Special Committee and the Board reviewed financial information,
including projections, delivered to Lazard by the Company for material
accuracy and completeness. In the case of projections delivered to Lazard by
the Company's management, the Special Committee and Lazard recognized that the
cyclical and volatile nature of the chemical commodities industry in which the
Company operates, coupled with the Company's operating leverage (which can
make small changes in pricing or costs material to profitability), makes any
forecasts or projections inherently unreliable as demonstrated by the
historical significant and short-term fluctuations in the Company's
performance. Subject to the preceding sentence, the Special Committee and the
Board considered Lazard's reliance on the information delivered to be
reasonable. The Special Committee and the Board also independently reviewed
the principal methodologies and assumptions used by Lazard in reaching its
fairness opinion.     
   
  Lazard's opinion was necessarily based on economic, monetary, market and
other conditions as in effect on, and the information made available to it as
of, the date of its opinion. Lazard did not assume any responsibility to
update or revise its opinion, and does not expect to do so. Lazard's opinion
did not address the Company's underlying business decision to effect the
Merger. Lazard expressed no opinion as to the likely     
 
                                      27
<PAGE>
 
trading range for the common stock of the Surviving Corporation following the
consummation of the Merger, which may vary depending upon, among other
factors, changes in interest rates, dividend rates, market conditions, general
economic conditions and other factors that generally influence the price of
securities. In rendering its opinion, Lazard assumed that the Merger would be
consummated on the terms described in the Merger Agreement, without any waiver
of any material terms or conditions by the Company or STX Acquisition, and
that obtaining the necessary regulatory approvals for the Merger would not
have an adverse effect on the Company or STX Acquisition.
 
  In arriving at its opinion and making its presentation to the Special
Committee at the April 24, 1996 meeting of such committee, Lazard considered
and discussed certain financial analyses and other factors. At its
presentation on April 24, 1996, Lazard presented a summary of results obtained
by using several different valuation methods (such summary together with
Lazard's presentation thereof are collectively referred to as the "Lazard
Presentation").
 
The following paragraphs summarize the Lazard Presentation:
   
  Market Test. Lazard, as financial advisor to the Special Committee,
contacted or received unsolicited communications from in excess of 35
potential purchasers in connection with the sale of the Company or either of
its two primary operating businesses. Such potential purchasers included a
broad range of companies in the chemical industry as well as a number of
financial buyers. Although a number of potential buyers indicated interest and
a few potential buyers made conditional offers to purchase one or both of the
primary operating businesses, after analyzing such indications of interest and
offers (including offers for each of the Company's two primary operating
businesses and the potential tax payment or other costs that would be incurred
in connection with any break-up of such businesses), it was determined that
the proposal of TSG was the most favorable received. Lazard did not disclose
the specific terms of any indication of interest or conditional offer by a
potential purchaser to any other potential purchaser. Lazard noted that it
believed that the results of these discussions with numerous potential
purchasers were the most important factors underlying its fairness opinion.
    
  Discounted Cash Flow Analysis. Using an unleveraged discounted cash flow
("DCF") methodology, Lazard estimated the present value of future free cash
flows of the Company if the Company were to perform on a stand-alone basis
(without giving effect to the Merger) in accordance with management's expected
case and downside case forecasts for each of the Company's two primary
operating businesses. Free cash flow represents the amount of cash generated
and available for principal, interest and dividend payments after providing
for ongoing business operations. Lazard aggregated (i) the present value of
the projected free cash flow for the 1996 to 2000 fiscal years derived from
the Company's projections with (ii) the present value of the range of terminal
values described below. The range of terminal values was calculated by
applying multiples of 4.0x to 5.0x to the Company's projected five-year
average earnings before interest, taxes, depreciation and amortization
("EBITDA"). This range of terminal values represented the Company's value
beyond the fiscal year ending September 30, 2000. As part of the DCF analysis,
Lazard used discount rates of 10.0% to 13.0%. After subtracting from the total
enterprise value the estimated net debt of $136.0 million projected at July
31, 1996, the DCF analysis resulted in an expected case equity value reference
range for the Company Common Stock of $12.20 to $16.28 per share and a
pessimistic case equity value reference range for the Company Common Stock of
$8.56 to $11.64 per share. Lazard concluded that, given the uncertain outlook
for the Company's businesses and the high volatility associated with the
Company's businesses, the $12 per share bid by TSG was within the range of
expectations of the DCF analysis.
   
  Leveraged Buyout Analysis. Lazard performed a leveraged buyout ("LBO")
analysis of the Company, utilizing expected case and downside case projections
provided by management of the Company for fiscal years 1996 through 2000 and
assuming the leveraged capital structure proposed by TSG ($368.5 million of
senior bank debt, $275.0 million of subordinated debt, $100.0 million of
discount notes and $130.7 million of equity). Based on management projections,
Lazard calculated the Company's projected EBITDA for each of fiscal years 1996
through 2000 and calculated the terminal value of the Company using multiples
of 4.0x to 5.0x of projected EBITDA for fiscal year 2000. Lazard then
subtracted from the terminal value the projected net debt at the end of     
 
                                      28
<PAGE>
 
fiscal year 2000 (based on TSG's proposed structure) of $378.8 million to
arrive at the terminal value for the Company's equity. The present value of
the terminal equity value was calculated using discount rates from 25.0% to
35.0%. This LBO analysis resulted in an expected case equity value reference
range for the Common Stock of the Company after the LBO of $13.25 to $25.73
per share and a pessimistic case equity value reference range for the Common
Stock of the Company after the LBO of $4.33 to $11.89 per share. Given the
factors described above in connection with the DCF analysis, Lazard concluded
that the $12 per share bid by TSG was within the range of expectations of the
LBO analysis.
 
  Comparable Public Company Analysis. Lazard compared certain publicly
available financial, operating and stock market performance data of selected
publicly traded companies in the U.S. petrochemicals industry with the
financial, operating and stock market performance of the Company. The publicly
traded companies reviewed by Lazard in this analysis were Geon Company,
Georgia Gulf Corporation, Lyondell Petrochemical Company, Rexene Corporation
and Union Carbide Corporation. Lazard examined, among other things, multiples
of market capitalization (defined as market value of common equity plus net
indebtedness, preferred stock and minority interests, based on April 19, 1996
closing stock prices) to latest twelve-month EBITDA (which ranged from 2.6x to
4.9x); market capitalization to estimated 1996 EBITDA (which ranged from 3.2x
to 7.1x); market capitalization to latest twelve-month EBIT (which ranged from
3.0x to 6.0x); market capitalization to estimated 1996 EBIT (which ranged from
3.8x to 10.2x); market capitalization to latest twelve-month revenues (which
ranged from 0.6x to 1.6x); and market capitalization to estimated 1996
revenues (which ranged from 0.7x to 1.7x). The earnings and revenues estimates
were derived from published research reports of certain analysts covering the
selected companies. Lazard then compared these multiples for the selected
companies to corresponding multiples for the Company calculated based on the
offer by TSG. Lazard noted that such multiples for the Company were within the
ranges of those for the selected companies. Because of the differences between
the comparable companies and the petrochemical business of the Company, and
the absence of any comparable company to the Company's pulp chemical business,
as described below, Lazard did not consider the comparable company valuation
to be as relevant as certain of the other valuation methodologies described
herein.
   
  Historical Stock Prices. Lazard reviewed the trading prices of the Company's
Common Stock prior to the Company's January 29, 1996 press release in which it
stated that it was exploring alternatives to enhance shareholder value. Lazard
noted that the Company Common Stock closed at $8.25 per share on January 24,
1996, that on January 25, 1996 an analyst raised its rating on the Company to
"buy" from "neutral" and that for the three trading days prior to the January
29, 1996 announcement (January 24, 25 and 26) the Company's Common Stock
closed at $8.25, $9.38 and $9.25 per share, respectively. Lazard noted that
the $12.00 per share price of the TSG offer represents a 45% premium to the
January 24 unaffected closing stock price of $8.25. Although Lazard reviewed
such historical trading prices of the Company's Common Stock, in rendering its
fairness opinion Lazard gave less weight to such trading prices than to
certain other factors, including the market test described above.     
 
  Comparable Transactions. Lazard also reviewed the consideration paid or to
be paid in other acquisitions of petrochemicals and pulp chemicals businesses.
In performing this analysis Lazard noted, as described below, that there were
limited direct comparable transactions relating to the Company's businesses.
Accordingly, given such circumstances, Lazard concluded that the equity value
for the Company Common Stock derived from the comparable transactions analysis
was not attainable as of the date of its opinion.
 
  In arriving at its opinion and in preparing the Lazard Presentation, Lazard
performed a variety of financial analyses, the material portions of which are
summarized above. The summary set forth above does not purport to be a
complete description of the analyses performed by Lazard. In addition, Lazard
believes that its analyses must be considered as a whole and that selecting
portions of such analyses and the factors considered by it, without
considering all of such analyses and factors, could create an incomplete view
of the process underlying its analyses set forth in the opinion and the Lazard
Presentation. The preparation of a fairness opinion is a complex process and
is not necessarily susceptible to partial analysis or summary description.
With regard to the comparable transaction and the comparable public company
analyses summarized above, Lazard selected
 
                                      29
<PAGE>
 
comparable transactions and public companies on the basis of various factors,
including the size of the public company and similarity of the line of
business; however, no public company utilized as a comparison is identical to
the Company or the business for which a comparison is being made. In
particular, Lazard noted, among other things, that certain of the comparable
companies were more diversified than the Company, had a broader geographical
base than the Company, and were engaged in different businesses from the
Company, and that there were no public companies directly comparable to the
Company's pulp chemicals business. In addition, Lazard noted similar
limitations in its analysis of comparable transactions. Accordingly, an
analysis of the foregoing is not mathematical; rather, it involves complex
considerations and judgments concerning differences in financial and operating
characteristics of the comparable companies and other factors that could
affect the acquisition or public trading value of the comparable companies to
which the Company or its businesses are being compared.
 
  In performing its analyses, Lazard made numerous assumptions with respect to
industry performance, general business and economic conditions and other
matters, many of which are beyond the Company's control. Any estimates
contained in such analyses are not necessarily indicative of future results or
values, which may be significantly more or less than such estimates. Estimates
of values of companies or parts of companies do not purport to be appraisals
or to necessarily reflect the price at which such companies or parts may
actually be sold, and such estimates are inherently subject to uncertainty.
 
  Lazard is an internationally recognized investment banking firm that
regularly engages in the valuation of businesses and their securities in
connection with mergers and acquisitions. The Special Committee selected
Lazard to act as its financial advisor on the basis of Lazard's international
reputation and a competitive selection process. In 1988, Lazard acted as co-
manager for an equity offering of the Company's securities. In addition, Mr.
Frank Pizzitola, a Limited Managing Director of Lazard, is a member of the
Board of Directors of the Company.
   
  Pursuant to a letter agreement dated as of December 1, 1995, between the
Special Committee and Lazard, Lazard agreed to act as financial advisor to the
Special Committee in connection with strategic alternatives available to the
Company, including the possible sale of the Company. The Special Committee
agreed that the Company would pay Lazard a fee of $250,000, which was paid
upon execution of such letter agreement, and a fee (to which the $250,000 fee
is to be credited) of 0.5% of the aggregate consideration paid for the equity
or assets of the Company in the event of a sale of all or a substantial
portion of the Company or its assets (including the Merger), payable upon
consummation of any such transaction. The Company estimates that the maximum
amount of such fee will not be more than $3.5 million. The Special Committee
also agreed that the Company would reimburse Lazard for all of its reasonable
out-of-pocket expenses, including the reasonable fees and expenses of any
legal counsel, and would indemnify Lazard and certain related persons against
certain liabilities, including certain liabilities under the federal
securities laws relating to, or arising out of, its engagement.     
 
  As noted under the caption "SPECIAL FACTORS--Recommendation of the Board,"
"--Fairness of the Merger," the fairness opinion of Lazard was only one of
many factors considered by the Special Committee in recommending approval of
the Merger Agreement.
 
ACCOUNTING TREATMENT
 
  The Merger will be accounted for as a recapitalization. Accordingly, the
historical basis of the Company's assets and liabilities will not be impacted
by the Merger transaction.
 
CERTAIN TAX CONSEQUENCES OF THE MERGER
 
  This discussion is a general summary of the material United States federal
income tax ("U.S. federal income tax") consequences of the Merger to Company
stockholders and does not purport to be a complete analysis or discussion of
all potential tax considerations or consequences relevant to a decision
whether to vote for the approval of the Merger, or whether to tender all or
part of a Company stockholder's Common Stock. The discussion does not address
all aspects of U.S. federal income taxation that may be applicable to Company
 
                                      30
<PAGE>
 
stockholders in light of their status or personal investment circumstances,
nor does it address the U.S. federal income tax consequences of the Merger
that are applicable to Company stockholders subject to special U.S. federal
income tax treatment including (without limitation) foreign persons, insurance
companies, tax-exempt entities, retirement plans, dealers in securities,
persons who acquired their Common Stock pursuant to the exercise of employee
stock options or otherwise as compensation, and persons who hold their Common
Stock as part of a "straddle," "hedge" or "conversion transaction." The
discussion addresses neither the effect of any applicable state, local or
foreign tax laws, nor the effect of any federal tax laws other than those
pertaining to the U.S. federal income tax. THE FOLLOWING IS A GENERAL
DISCUSSION OF THE MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES OF THE MERGER
TO CERTAIN COMPANY STOCKHOLDERS AND IS INCLUDED FOR GENERAL INFORMATION ONLY.
THE FOLLOWING DISCUSSION DOES NOT TAKE INTO ACCOUNT THE PARTICULAR FACTS AND
CIRCUMSTANCES OF EACH COMPANY STOCKHOLDER'S TAX STATUS AND ATTRIBUTES. AS A
RESULT, THE U.S. FEDERAL INCOME TAX CONSEQUENCES ADDRESSED IN THE FOLLOWING
DISCUSSION MAY NOT APPLY TO EACH COMPANY STOCKHOLDER. ACCORDINGLY, COMPANY
STOCKHOLDERS SHOULD CONSULT THEIR OWN TAX ADVISORS REGARDING THE SPECIFIC TAX
CONSEQUENCES OF THE MERGER, INCLUDING THE APPLICATION AND EFFECT OF FEDERAL,
STATE, LOCAL AND OTHER TAX LAWS AND THE POSSIBLE EFFECTS OF CHANGES IN FEDERAL
AND OTHER TAX LAWS.
 
  The discussion is based on the Internal Revenue Code of 1986, as amended
(the "Code"), regulations proposed or promulgated thereunder, and current
administrative interpretations and judicial precedents relating thereto, all
of which are subject to change. Any such change, which may or may not be
retroactive, could alter the tax consequences discussed herein. The discussion
is also based on certain customary assumptions regarding the factual
circumstances that will exist at the Effective Time of the Merger. If any of
these factual assumptions is inaccurate, the tax consequences of the Merger
could differ from those described herein. The discussion assumes that shares
of Common Stock are held as capital assets (within the meaning of Section 1221
of the Code) at the Effective Time, and that the Company and Chemicals will
join in the making of a consolidated return for U.S. federal income tax
purposes.
 
  Characterization of the Merger for U.S. Federal Income Tax Purposes. For
U.S. federal income tax purposes, STX Acquisition will be disregarded as a
transitory entity, and the Merger of STX Acquisition with and into the Company
will be treated as a sale of a portion of a tendering stockholder's Common
Stock in connection with the Merger and as a redemption of a portion of the
stockholder's Common Stock by the Company. The number of shares of Common
Stock disposed of by a stockholder pursuant to the Merger that will be treated
as sold in the Merger will be equal to the total number of shares surrendered
by the stockholder multiplied by (a) the amount of cash contributed to STX
Acquisition in the Equity Private Placement in exchange for STX Acquisition
stock divided by (b) the aggregate amount of cash paid to stockholders
pursuant to the Merger. The remainder of the stockholder's shares of Common
Stock disposed of in the Merger will be treated as redeemed by the Company.
Because the Maximum Rollover Amount is limited to 5.0 million shares, and
stockholders making a Rollover Election will be subject to pro rata reduction
in the event Rollover Elections exceed the Maximum Rollover Amount, there can
be no assurance that a stockholder making a Rollover Election will be able to
retain all of his shares of Common Stock. See "Stockholders Receiving Cash"
below for a discussion of the consequences of cash being deemed paid in
redemption of Common Stock. Stockholders should note that the Internal Revenue
Service (the "Service") may attempt to recharacterize the tax treatment of the
Merger. If any such recharacterization by the Service were judically
sustained, the consequences of the Merger could, perhaps materially, differ
from those described herein.
 
  Stockholders Receiving Cash. As described more fully below, the U.S. federal
income tax consequences of the Merger with respect to a particular stockholder
who receives cash (including cash paid to dissenters and cash paid in lieu of
fractional shares) will depend upon, among other things, (i) the extent to
which a stockholder is deemed to have sold his Common Stock in the Merger or
is deemed to have had its Stock redeemed by the Company and (ii) whether the
redemption of a holder's Common Stock by the Company will qualify as a sale or
exchange under Section 302 of the Code. First, to the extent that a
stockholder is considered to have sold
 
                                      31
<PAGE>
 
Common Stock in the Merger, such stockholder will recognize either capital
gain or loss equal to the difference between (i) the number of shares treated
as sold in the Merger multiplied by $12, and (ii) the stockholder's adjusted
tax basis in such shares. Such gain or loss generally will be long-term
capital gain or loss if the Common Stock has been held by the stockholder for
more than one year. Second, a stockholder also will recognize either capital
gain or loss equal to the difference between (i) the number of shares treated
as redeemed by the Company multiplied by $12, and (ii) the stockholder's
adjusted tax basis in such Common Stock, if such redemption is treated as a
sale or exchange under Section 302 of the Code with respect to such
stockholder. Such gain or loss will also generally be long-term capital gain
or loss if the Common Stock has been held by the stockholder for more than one
year.
 
  Under Section 302 of the Code, a redemption of Common Stock pursuant to the
Merger will, as a general rule, be treated as a sale or exchange if the
redemption (a) results in a "complete termination" of the stockholder's
interest in the Company, (b) is "substantially disproportionate" with respect
to the stockholder, or (c) is "not essentially equivalent to a dividend" with
respect to the stockholder. In determining whether any of these Section 302
tests is satisfied, stockholders must take into account not only the Common
Stock that they actually own, but also any Common Stock they are "deemed" to
own under the constructive ownership rules set forth in Section 318 of the
Code. Pursuant to these constructive ownership rules, a stockholder will be
deemed to own stock that is actually or constructively owned by certain
members of his or her family (spouse, children, grandchildren and parents) and
other related parties including, for example, certain entities in which such
stockholder has a direct or indirect interest (including partnerships,
estates, trusts and corporations), as well as shares of stock that such
stockholder (or a related person) has the right to acquire upon exercise of an
option or conversion right (including options held pursuant to the Company's
Omnibus Stock and Incentive Plan). In addition, if a stockholder lives in a
community property state, the community property laws of that state may have
an effect on the constructive ownership rules. Stockholders who live in a
community property state should consult their own advisors with respect to the
impact of community property laws on the constructive ownership rules. Section
302(c)(2) of the Code provides certain exceptions to the family attribution
rules for the purpose of determining a "complete termination." If a
stockholder intends to rely upon these exceptions, the stockholder must file a
"waiver of family attribution" statement with his tax return and must comply
with certain other requirements set forth in the Code.
 
  The redemption of a stockholder's Common Stock will result in a "complete
termination" of a stockholder's interest in the Company if either (a) all the
Common Stock actually and constructively owned by the stockholder is redeemed
or sold pursuant to the Merger or (b) all of the Common Stock actually owned
by the stockholder is redeemed or sold pursuant to the Merger and the
stockholder is eligible to waive, and does effectively waive in accordance
with Section 302(c) of the Code, attribution of all Common Stock which
otherwise would be considered to be constructively owned by such stockholder.
Such waiver of attribution applies only to Common Stock that would be
attributed to a stockholder from members of such stockholder's family.
Stockholders should consult their own tax advisors with respect to the
application of the "complete termination" test to their particular facts and
circumstances.
 
  The redemption of a stockholder's Common Stock will be "substantially
disproportionate" with respect to such stockholder if the percentage of Common
Stock actually and constructively owned by such stockholder immediately
following the Merger is less than 80% of the percentage of Common Stock
actually and constructively owned by such stockholder immediately prior to the
Merger and is less than 50% of the total Common Stock outstanding after the
Merger. Stockholders should consult their own tax advisors with respect to the
application of the "substantially disproportionate" test to their particular
facts and circumstances. Waiver of family attribution is not available in
applying the "substantially disproportionate" test.
 
  Even if the redemption of a stockholder's Common Stock fails to satisfy the
"complete termination" test and the "substantially disproportionate" test
described above, the redemption of a stockholder's Common Stock may
nevertheless satisfy the "not essentially equivalent to a dividend" test if
the stockholder's redemption of Common Stock pursuant to the Merger results in
a "meaningful reduction" in such stockholder's proportionate
 
                                      32
<PAGE>
 
Common Stock interest in the Company. Whether the receipt of cash by a
stockholder will be considered "not essentially equivalent to a dividend" will
depend upon such stockholder's particular facts and circumstances. No general
guidelines indicating the facts and circumstances under which a redemption
will be considered to produce a meaningful reduction in proportionate interest
have been provided by the courts or issued by the Service. However, the
Service has indicated in Revenue Ruling 76-385 that a minority stockholder
(i.e., a holder who exercises no control over corporate affairs and whose
proportionate stock interest is minimal in relation to the number of shares
outstanding) generally is treated as having had a "meaningful reduction" in
his stock interest if a cash payment reduces such stockholder's actual and
constructive stock ownership by a relatively small amount. Stockholders should
consult with their own tax advisors as to the application of this test in
their particular situation. Waiver of family attribution is not available in
the context of the "not essentially equivalent to a dividend" test.
 
  In assessing whether the redemption of a stockholder's Common Stock
satisfies the "substantially disproportionate" test or the "not essentially
equivalent to a dividend" test described above, stockholders should consider
the fact that the Merger will substantially reduce the number of outstanding
shares of Common Stock. As a result, if a stockholder elects to retain a
portion of its Common Stock, the stockholder's percentage interest in the
Common Stock of the Company may not be reduced even if the stockholder
receives cash for a substantial portion of his Common Stock. Based on the
number of shares of Common Stock that are expected to remain outstanding after
the Merger, if a stockholder were to retain approximately 20% or more of the
shares of Common Stock that the stockholder owned prior to the Merger, the
stockholder's percentage interest in the Common Stock of the Company would not
be reduced as a result of the Merger. Stockholders should consult their own
tax advisors as to the impact of the reduction in the outstanding shares of
Common Stock on the application of the "substantially disproportionate" and
"not essentially equivalent to a dividend" tests described above.
 
  If a stockholder cannot satisfy any of the three tests described above and
to the extent the Company has sufficient current and/or accumulated earnings
and profits, such stockholder will be treated as having received a dividend
which will be includable in gross income (and treated as ordinary income) in
an amount equal to the cash received, and the stockholders' basis in the
Common Stock disposed of will not offset the amount of cash received, but
instead will be reallocated to shares of Common Stock still held by such
stockholder or, although the matter is not free from doubt, if no shares are
actually owned, reallocated to those shares constructively owned, under
certain circumstances.
 
  To the extent that one of the three tests described above is satisfied, the
stockholder will be treated as having sold his Common Stock, which will
generally give rise to long-term capital gain or loss if the Common Stock has
been held by the stockholder for more than one year. While the marginal tax
rates for dividends and capital gains are the same for corporate stockholders,
the current maximum U.S. federal income tax rate on ordinary income of
individuals (39.6%) exceeds the maximum tax rate on long-term capital gains
(28%). In addition, capital gain can generally be offset by any capital loss
that a stockholder may have incurred, whereas capital loss of a corporation
may not offset ordinary income and capital loss of an individual can only
offset ordinary income to the extent of $3,000 per year (subject to
carryover). There are presently pending various proposals to reduce the tax
rate that would apply to long-term capital gains. At this time, it is not
possible to predict whether such proposals will ultimately be enacted, and if
so, to what extent such a reduced rate would have retroactive effect and
therefore apply to a disposition of Common Stock pursuant to the Merger.
 
  In the case of a corporate stockholder, if the cash paid is treated as a
dividend, such dividend income may be eligible for the 70% dividends-received
deduction. The dividends-received deduction is subject to certain limitations,
and may not be available if the corporate stockholder does not satisfy certain
holding period requirements with respect to the Common Stock or if the Common
Stock is treated as "debt financed portfolio Stock" within the meaning of Code
Section 246A(c). Further, recently proposed legislation would, if enacted into
law, reduce the dividends-received deduction percentage. Additionally, if a
dividends-received deduction is available, the dividend may be treated as an
"extraordinary dividend" under Section 1059(a) of the Code, in
 
                                      33
<PAGE>
 
which case a corporate stockholder's adjusted tax basis in the Common Stock
retained by such stockholder would be reduced, but not below zero, by the
amount of the nontaxed portion of such dividend. Any amount of the nontaxed
portion of the dividend in excess of the corporate stockholder's adjusted tax
basis generally will be subject to tax upon a sale or other taxable
disposition of the Common Stock. In addition, under the adjusted current
earnings rules of the alternative minimum tax provisions of the Code, and
depending upon a corporate holder's particular tax situation, up to 75% of any
dividends received deduction may be added back in the computation of
alternative minimum taxable income. Corporate stockholders are urged to
consult their own tax advisors as to the effect of Section 1059 of the Code on
the adjusted tax basis of their Common Stock, and the effect of the
alternative minimum tax and recently proposed legislation on the availability
and/or the amount of the dividends-received deduction.
 
  BECAUSE THE DETERMINATION OF WHETHER THE RECEIPT OF CASH WILL BE TREATED AS
HAVING THE EFFECT OF THE DISTRIBUTION OF A DIVIDEND WILL GENERALLY DEPEND UPON
THE FACTS AND CIRCUMSTANCES OF EACH COMPANY STOCKHOLDER, COMPANY STOCKHOLDERS
ARE STRONGLY ADVISED TO CONSULT THEIR OWN TAX ADVISORS REGARDING THE TAX
TREATMENT OF CASH RECEIVED IN THE MERGER.
   
  The ability to elect the type of consideration to be received pursuant to
the Merger affords each stockholder some flexibility in selecting the type of
consideration that will best serve his or her personal tax and financial
planning needs. However, each stockholder should be aware that his or her
ability to satisfy (or, alternatively, fail to satisfy) any of the foregoing
tests and thereby avoid (or, alternatively, obtain) dividend treatment may be
affected by the various adjustments, pro-rations and allocations of the Merger
Consideration. If the Maximum Rollover Amount is exceeded so that a pro rata
reduction is triggered, shareholders may receive more cash than may be
anticipated at the time a Rollover Election is made.     
 
  Stockholders Retaining Stock and Receiving No Cash. The Merger will have no
U.S. federal income tax consequences for stockholders who retain their Common
Stock and receive no cash. Accordingly, a stockholder will not recognize any
gain or loss on any Common Stock retained by such stockholder.
 
  Stockholders Retaining a Portion of their Common Stock and Receiving Cash.
To the extent that a stockholder elects to retain a portion of its Common
Stock and exchange a portion of its Common Stock for cash, or to the extent a
stockholder receives cash in exchange for some portion of its Common Stock as
a result of proration, the tax treatment of the stockholder's receipt of such
cash will be the same as set forth above under Stockholders Receiving Cash.
 
  As described above under Stockholders Retaining Common Stock and Receiving
No Cash, the Merger will have no tax consequences to a stockholder (and, thus,
a stockholder will not recognize any gain or loss as a result of the Merger),
to the extent such stockholder retains Common Stock. However, as described
more fully above under Stockholders Receiving Cash, a stockholder's retention
of Common Stock may, under certain circumstances, cause the cash received by
such stockholder pursuant to the Merger to be treated as a dividend for U.S.
federal income tax purposes.
 
  Cancellation of Options, SARs and Phantom Stock. To the extent that a holder
of an Option, SAR or Phantom Stock receives cash upon the cancellation of such
Option, SAR or Phantom Stock, such cash will give rise to compensation income
(taxable at ordinary income rates) and will be subject to applicable
employment tax withholding.
 
  Tax Treatment of Employee Stock Ownership Plan. Whether the shares of Common
Stock held by the Company's Employee Stock Ownership Plan (the "ESOP") are
retained or are cashed out, there should be no tax effect on the ESOP, because
the ESOP is a tax-exempt entity.
 
                                      34
<PAGE>
 
  Tax Treatment of Stockholders Participating in Employee Stock Ownership
Plan. Whether the shares of Common Stock held for an employee's benefit by the
ESOP are retained or are cashed out, there should be no immediate tax effect
to such employee. Further, whether an employee elects to retain or cash out
ESOP shares should have no impact on the tax treatment applicable to such
employee's non-ESOP shares. In addition, the Code provides favorable tax rules
for certain distributions from the ESOP, including distributions of Common
Stock. Therefore, any distributions of Common Stock from the ESOP will be
subject to special rules which may result in a different tax treatment to
stockholders receiving such distributions from the treatment described herein.
However, distributions from the ESOP will not be made as result of the Merger,
but will be made in the regular course upon the death, disability, retirement,
or other termination of an ESOP participant.
 
  Foreign Stockholders--Withholding. The following is a general discussion of
certain U.S. federal income tax consequences of the Merger to foreign
stockholders. For this purpose, a "foreign stockholder" is any person who is,
for U.S. federal income tax purposes, a foreign corporation, a non-resident
alien individual, a foreign partnership or certain foreign estates or trusts.
 
  In the case of any foreign stockholder, the Exchange Agent will withhold 30%
of the amount paid to redeem the Common Stock of such stockholder in order to
satisfy certain U.S. withholding requirements, unless such foreign stockholder
proves in a manner satisfactory to the Company and the Exchange Agent that
either (i) the redemption of its Common Stock pursuant to the Merger will
qualify as a sale or exchange under Section 302 of the Code, rather than as a
dividend for U.S. federal income tax purposes, in which case no withholding
will be required, (ii) the foreign stockholder is eligible for a reduced tax
treaty rate with respect to dividend income, in which case the Exchange Agent
will withhold at the reduced treaty rate or (iii) no U.S. withholding is
otherwise required.
 
  In addition, the Company can give no assurances that it is not a "United
States Real Property Holding Corporation" within the meaning of Section
897(c)(2) of the Code. Consequently, the Exchange Agent will withhold 10% of
the amount paid to purchase or redeem a foreign stockholder's Common Stock if
the foreign stockholder cannot prove, in a manner satisfactory to the Company
and the Exchange Agent, that it did not own 5% or more of the Stock of the
Company at any time during the previous five years and such purchase or
redemption qualifies as a sale or exchange for federal income tax purposes.
Foreign stockholders should consult their own tax advisors regarding the
application of these withholding rules.
 
  Information Reporting and Backup Withholding. The Company must report
annually to the IRS and to each stockholder the amount of dividends paid to
such stockholder and the backup withholding tax, if any, withheld with respect
to such dividends. Copies of these information returns also may be made
available to the tax authorities in the country in which a foreign stockholder
resides under the provisions of an applicable income tax treaty.
 
  Backup withholding (which generally is a withholding tax imposed at the rate
of 31% on certain payments to persons that fail to furnish certain information
under the United States information reporting requirements) generally will not
apply to dividends paid to a foreign stockholder at an address outside the
United States (unless the payor has knowledge that the payee is a U.S.
person).
 
  Payment of the proceeds of a sale of Common Stock by or through a United
States office of a broker is subject to both backup withholding and
information reporting unless the beneficial owner certifies under penalties of
perjury that it is a foreign stockholder, or otherwise establishes an
exemption. In general, backup withholding and information reporting will not
apply to a payment of the proceeds of a sale of Common Stock by or through a
foreign office of a broker. If, however, such broker is, for United States
federal income tax purposes, a U.S. person, a controlled foreign corporation,
or a foreign person that derives 50% or more of its gross income for certain
periods from the conduct of a trade or business in the United States, such
payments will be subject to information reporting, but not backup withholding,
unless (1) such broker has documentary evidence in its records that the
beneficial owner is a foreign holder and certain other conditions are met, or
(2) the beneficial owner otherwise establishes an exemption.
 
                                      35
<PAGE>
 
  Any amounts withheld under the backup withholding rules may be allowed as a
refund or a credit against the holder's U.S. federal income tax liability
provided the required information is furnished to the IRS.
 
  Proposed Regulations have been issued by the Treasury Department which are
scheduled to be effective for payments made after December 31, 1997, and which
would change certain aspects of the backup withholding and information
reporting rules and their application to the Common Stock. Stockholders should
consult their own tax advisors with respect to the effect that such Proposed
Regulations could have on their particular circumstances.
 
  THE FOREGOING DISCUSSION DOES NOT ADDRESS EVERY FEDERAL INCOME TAX CONCERN
WHICH MAY BE APPLICABLE TO A PARTICULAR STOCKHOLDER. EACH STOCKHOLDER IS URGED
TO CONSULT SUCH STOCKHOLDER'S OWN TAX ADVISOR TO DETERMINE THE TAX
CONSEQUENCES TO SUCH STOCKHOLDER, IN THE LIGHT OF ITS PARTICULAR
CIRCUMSTANCES, OF THE DISPOSITION OF COMMON STOCK PURSUANT TO THE MERGER.
 
RISKS AND EFFECTS OF THE MERGER
 
  In considering the matters set forth in this Proxy Statement, including the
decision of whether to make a Rollover Election (with respect to all or any
portion of the shares of Common Stock held by a stockholder), stockholders of
the Company should carefully consider, among other things, the significant
risks and factors described below that are associated with the Company and
that may significantly increase the risks associated with a continuing common
stock investment in the Surviving Corporation.
   
  Control by Certain Stockholders. Upon consummation of the Merger, the
investors in the Equity Private Placement, including principals of TSG and
Unicorn, and certain principal stockholders of the Company will own at least
75% of the outstanding shares of Surviving Corporation Common Stock. These
investors and stockholders will enter into a Stockholders Agreement, the
effect of which will be to subject the transfer of such shares to certain
rights of first refusal. Such stockholders collectively will have the ability
to exercise control over the business and affairs of the Surviving
Corporation, including the ability to elect all of the Board of Directors, the
power to determine the management of the business and the power to determine
the outcome of corporate actions requiring stockholders' approval. TSG and
Unicorn have advised the Company that there are no current intentions to
engage in a second step transaction to eliminate minority shareholders
following the Merger.     
 
  Limited Liquidity of Rollover Shares. The Company expects the liquidity of
the Common Stock to be significantly diminished after consummation of the
Merger due to (i) the substantial reduction in the number of outstanding
shares (from approximately 55,690,000 shares prior to the Merger to
approximately 10,890,834 shares thereafter), (ii) the delisting of the Common
Stock from trading on the New York Stock Exchange, and (iii) statutory and
contractual restrictions on transfer of the shares of Common Stock of the
Surviving Corporation issued in exchange for Common Stock of STX Acquisition.
As a result of the foregoing, the Company expects that the market for the
Common Stock retained as Rollover Shares will be extremely limited and that an
active market will not develop.
   
  High Financial Leverage. After giving effect to the Financing, the Surviving
Corporation and its subsidiaries will have interest expenses and principal
repayment obligations at a level significantly higher than the Company's
present obligations under its indebtedness. If the Merger had occurred at
March 31, 1996, the Surviving Corporation, on a consolidated basis, would have
had indebtedness of $722.9 million and stockholders' equity of $(291.9)
million, and Chemicals would have had indebtedness of $622.9 million and
stockholders' equity of $(194.9) million. In addition, on a pro forma basis
for the six months ended March 31, 1996, the Surviving Corporation would have
had a deficiency of earnings to cover fixed charges of $1.1 million. The
Surviving Corporation will not be required to make interest payments on the
Discount Notes prior to         , 2002, but there can be no assurance that the
Surviving Corporation will have adequate cash available at that time and
thereafter to make the scheduled semi-annual interest payments. The high
degree of leverage of the     
 
                                      36
<PAGE>
 
   
Surviving Corporation and Chemicals will have important consequences to
holders of the Rollover Shares, including the following: (i) the ability of
the Surviving Corporation and Chemicals to obtain additional financing in the
future for working capital, capital expenditures, acquisitions, general
corporate purposes or other purposes, if needed, may be impaired; (ii) a
substantial portion of cash flow from operations will be dedicated to the
payment of interest, principal and other repayment obligations, thereby
reducing the funds available for operations and any future business
opportunities; (iii) the degree of leverage may make the Company more
vulnerable to a downturn in its business or the economy generally; and (iv)
the terms of such indebtedness will materially restrict the Surviving
Corporation's ability to pay cash dividends. Any inability of the Surviving
Corporation or Chemicals to service their respective obligations could have a
significant adverse effect on the market value and marketability of the
Rollover Shares.     
 
  The Credit Agreement and the Indentures contain numerous financial and
operating covenants, including, but not limited to, restrictions on the
Surviving Corporation's and Chemicals' ability to incur indebtedness, pay
dividends, create liens, sell assets, engage in certain mergers and
acquisitions and refinance existing indebtedness. The ability of the Surviving
Corporation and Chemicals to comply with such covenants and other terms of the
Credit Agreement and the Indentures will depend on the future performance of
the Surviving Corporation.
 
  Future Dilution From Warrant Exercises. In connection with the Units
Offering, Warrants will be offered with the Discount Notes. Such Warrants and
the underlying Common Stock will be dilutive to the holders of Common Stock
following the Merger. Because the number of Warrants to be issued in the Units
Offering will not be established until final pricing terms of the Units are
determined, the amount of such dilution is not currently known.
 
  Equity in Surviving Corporation. Upon consummation of the Merger, all of the
equity of the Surviving Corporation will be owned by the stockholders who
retain Rollover Shares and the investors in the Equity Private Placement.
Stockholders who do not retain Rollover Shares will have no continuing equity
interest in the Surviving Corporation, and will no longer participate in any
earnings or growth of the Surviving Corporation. Similarly, such persons will
no longer face a risk of a decline in the value of the Common Stock.
 
  Petrochemical Raw Material Prices and Availability. For each of the
Company's petrochemical products, the cost of raw materials and utilities is
greater than all other costs of production combined. Therefore, an adequate
supply of raw materials at reasonable prices is critical to the success of the
Surviving Corporation's business. The Company does not produce many of its
major raw materials (benzene, ethylene, propylene, ammonia, methanol),
although the Company has a methanol plant under construction at Texas City,
which is anticipated to begin production in July 1996. These materials are all
commodity petrochemicals and the price for each can fluctuate widely for a
variety of reasons, including changes in the availability of these products
because of major capacity additions or significant plant operating problems. A
number of the Company's raw material suppliers provide the Company with a
significant amount of its raw materials, and if one significant supplier or a
number of significant suppliers were unable to meet their obligations under
present supply arrangements, or if such arrangements could not be renewed upon
expiration, the Company could be required to incur increased costs for its raw
materials. The ability to pass on increases in raw material prices to the
Company's customers is, to a large extent, dependent on market conditions.
There may be periods of time in which increases in feedstock prices are not
recovered by the Company due to an inability to increase the selling prices of
its products because of weakness in demand for, or oversupply of, such
products, and therefore, certain increases in raw materials prices may have a
material adverse effect on the results of operations of the Company.
 
  Cyclical Markets for Products; Dependence on Key Products. The Company's
business consists of the production and sale of styrene monomer,
acrylonitrile, acetic acid and other petrochemicals, as well as certain pulp
chemicals. The Company's two primary petrochemical products are styrene and
acrylonitrile, which accounted for 45% and 24% of the Company's 1995 revenues,
respectively. Historically, the prices of the Company's petrochemical and pulp
chemical products have been cyclical and sensitive to overall supply relative
to demand, the level of general business activity and the availability and
price of feedstocks. In the past, the Company's products have experienced
market tightness accompanied by higher prices and periods of oversupply
accompanied by lower prices. Certain styrene monomer producers have announced
plans to add significant
 
                                      37
<PAGE>
 
production capacity over the next several years, particularly in the Far East.
Current global production capacity for styrene is estimated to be
approximately 40 billion pounds and the Company believes that approximately
7.2 billion pounds of capacity will be added by competitors in the next two
years, including an estimated 3.5 billion pounds in 1997 and 3.7 billion
pounds in 1998. Although less than 5% of such additional capacity is expected
to be added on the U.S. Gulf Coast, where the Company operates, the Company
expects that prices for styrene will decline from current levels until global
demand for styrene increases sufficiently to absorb such additional production
capacity, and such declines could adversely affect the Company's results of
operations. In addition, the Company expects competitors to increase
production capacity of acrylonitrile during the next two years, and such
increases could adversely affect prices for acrylonitrile. In any event, the
prices for the Company's products are expected to fluctuate in the future, and
any prolonged or severe softness in the market for any of its principal
products will adversely affect the Company.
 
  Dependence on Texas City Plant. All of the Company's petrochemicals,
including all of its styrene and acrylonitrile, are produced at the Texas City
Plant. Significant unscheduled downtime at the Texas City Plant due to
equipment breakdowns, interruptions in the supply of raw materials or natural
gas, power failures, natural forces or any other cause, including the normal
hazards associated with the production of petrochemicals, could materially
adversely affect the Company. Although the Company maintains insurance,
including business interruption insurance, that it considers to be adequate
under the circumstances, there can be no assurance that a significant
interruption in the operation of a facility would not have a material adverse
effect on the Company's financial condition and results of operations.
   
  Ability to Complete Acquisitions. A significant element of the Company's
business strategy is to pursue strategic acquisitions that either expand or
complement the Company's products or markets. The financing for such
acquisitions will likely affect the Surviving Corporation's debt or equity
capitalization. There can be no assurance that the Surviving Corporation will
be able to identify and make acquisitions on terms favorable to it or that the
Surviving Corporation will be able to obtain financing for such acquisitions
on terms the Surviving Corporation finds acceptable. In addition, the terms of
the Indentures and the Credit Facility will limit the Surviving Corporation's
ability to incur additional debt to finance such acquisitions.     
 
  Highly Competitive Industries. The industries in which the Company operates
are highly competitive. Many of the Company's competitors, particularly in the
petrochemical industry, are larger and have substantially greater financial
resources than the Company. Among the Company's competitors are some of the
world's largest chemical companies that have their own raw material resources.
In addition, a significant portion of the Company's business is based upon
widely available technology. The entrance of new competitors into the industry
and the addition by existing competitors of new capacity may reduce the
Surviving Corporation's ability to maintain profit margins or its ability to
preserve its market share, or both. Such developments could have a negative
impact on the Surviving Corporation's ability to obtain higher profit margins,
even during periods of increased demand for the Surviving Corporation's
products.
 
  Environmental and Safety. The Company's operations involve the handling,
production, transportation and disposal of materials classified as hazardous
or toxic and are subject to extensive federal, state and local regulatory
requirements relating to environmental affairs, waste management, health and
safety and chemical products. Operating permits are or may be required for the
operation of some of the Company's operating units and chemical waste disposal
operations, and these permits are subject to revocation, modification and
renewal. Governmental authorities have the power to enforce compliance with
these regulations and permits, and violators are subject to fines, injunctions
or both. Third parties may also have the right to sue to enforce compliance.
Management believes that the Company's operations are in compliance in all
material respects with applicable environmental laws. However, the operations
of a chemical manufacturing facility entail some risk of environmental damage,
and there can be no assurance that material costs or liabilities will not be
incurred. Moreover, it is possible that other developments, such as
increasingly strict requirements of environmental laws and enforcement
policies, could bring into question the handling, manufacture, use, emission
or disposal of
 
                                      38
<PAGE>
 
substances or pollutants by the Company. There can be no assurance that past
or future operations will not result in remedial obligations or exposure to
injury or claims of injury by employees or the public due to toxic or
hazardous materials. In addition, a catastrophic event at the Company's
facilities could result in liabilities to the Company substantially in excess
of its insurance coverages.
 
  The Company's pulp chemical business is sensitive to potential environmental
regulation. In general, proposed environmental regulations support
substitution of chlorine dioxide, which is produced from sodium chlorate, for
elemental chlorine in the pulp bleaching process. Certain environmental groups
are encouraging passage of regulations which restrict the amount of Absorbable
Organic Halides ("AOX") or chlorine derivatives in bleach plant effluent.
Increased substitution of chlorine dioxide for elemental chlorine in the pulp
bleaching process significantly reduces the amount of AOX and chlorine
derivatives in bleach plant effluent. As long as there is no outright ban on
chlorine containing compounds, regulations restricting AOX or chlorine
derivatives in bleach plant effluent should favor the use of chlorine dioxide,
thus sodium chlorate. However, any significant ban on chlorine containing
compounds could have a material adverse effect on the Surviving Corporation's
financial condition and results of operations.
 
  Long-Term Contracts. The Company sells substantial portions of its styrene
and acrylonitrile production under long-term contracts, and all of its acetic
acid, plasticizers, tertiary butylamine and sodium cyanide production under
long-term contracts with single customers. These contracts are intended to
provide some stability if demand for or prices of the Company's products
decline significantly, but also limit the Company's ability to take full
advantage of attractive market conditions during periods of higher prices for
these products. During fiscal 1995 a significant portion of the Company's
production from the Texas City Plant was dedicated to multi-year contracts
with Monsanto Company, subsidiaries of The British Petroleum Company P.L.C.
("BP"), BASF Corporation, Mitsubishi International Corporation ("Mitsubishi")
Flexsys America L.P. (a joint venture between Monsanto and Akzo Nobel NV) and
E.I. du Pont de Nemours and Company. Revenues from BP and Mitsubishi accounted
for approximately 16% and 13%, respectively, of the Company's fiscal 1995
revenues. Under certain market conditions, the loss of one or more of these
customers or a material reduction in the amount of product purchased by one or
more of them could have a material adverse effect on the Surviving
Corporation.
 
  Foreign Operations, Country Risks and Exchange Rate Fluctuations. Over 14%
of the Company's revenues are derived from Canadian operations and 52% are
derived from export sales. International operations and exports to foreign
markets are subject to a number of special risks, including currency exchange
rate fluctuations, trade barriers, exchange controls, national and regional
labor strikes, political risks and risks of increases in duties, taxes and
governmental royalties, as well as changes in laws and policies governing
operations of foreign-based companies. In addition, earnings of foreign
subsidiaries and intercompany payments are subject to foreign income tax rules
that may reduce cash flow available to meet required debt service and other
obligations of the Company.
 
  Since the Company derives most of its pulp chemicals revenues from
production and sales by subsidiaries within Canada, the Company has organized
its subsidiary structure and its operations in part based on certain
assumptions about various Canadian tax (including, among others, income tax
and withholding tax) laws, currency exchange and capital repatriation laws and
other relevant laws. While the Company believes that such assumptions are
correct, there can be no assurance that Canadian taxing or other authorities
will reach the same conclusion. If such assumptions are incorrect, or if
Canada were to change or modify such laws or the current interpretation
thereof, the Company may suffer adverse tax and financial consequences.
 
  A portion of the Company's expenses and sales are denominated in foreign
currencies, and accordingly, the Company's revenues, cash flows and earnings
may be affected by fluctuations in certain foreign exchange rates, principally
between the United States dollar and the Canadian dollar, which may also have
adverse tax effects. In addition, because a portion of the Company's sales,
cost of goods sold and other expenses are denominated in Canadian dollars, the
Company has a translation exposure to fluctuations in the Canadian dollar
against the U.S. dollar. These currency fluctuations could have a material
impact on the Company as increases in the value of the
 
                                      39
<PAGE>
 
Canadian dollar have the effect of increasing the U.S. dollar equivalent of
cost of goods sold and other expenses with respect to the Company's Canadian
production facilities. The Company enters into forward foreign exchange
contracts to hedge such exposure for periods consistent with its committed
exposure, but does not engage in currency speculation.
       
       
THE COMPANY'S BUSINESS AFTER THE MERGER
 
  Business Strategy. The Company's strategy is to capitalize on its
competitive market position to take advantage of periods of tight supply and
high prices and margins for its primary products, which historically have
occurred on a cyclical basis, and to expand its production capacity to capture
future growth opportunities in the petrochemical and pulp chemical industries.
The expansion strategy includes pursuing both internal growth opportunities,
through capacity additions and debottleneckings, as well as strategic
acquisitions of chemical businesses. Key elements of this strategy are as
follows:
 
    Maintain Competitive Cost Position in Petrochemicals. The Company is
  currently upgrading and modernizing the Texas City Plant as part of its
  strategy of increasing its competitiveness by investing in new technology
  and equipment. The plant modernization effort at Texas City includes a
  significant capital commitment for replacing the older control technology
  in the styrene, acrylonitrile and acetic acid units with state-of-the-art
  distributive control systems, which should result in increased efficiencies
  and stronger operating fundamentals. The Company believes that the Texas
  City Plant enjoys certain cost advantages due to economies of scale and its
  proximity to sources of its principal raw materials.
     
    Pursue Low Cost Expansions in Petrochemicals. The Company is finalizing
  significant capacity expansions in its petrochemicals business, including
  the expansion of its acetic acid unit and construction of a new methanol
  plant. The acetic acid expansion was completed in May 1996 and increased
  capacity by more than 30% to nearly 800 million pounds per year. In
  conjunction with this expansion, the Company is constructing a world-scale
  150 million gallon methanol facility scheduled to begin production in
  September 1996. Capital investment will be shared equally by the Company
  and BP. The Company will be entitled to 60% of the methanol production and
  BP will be entitled to the remaining 40% of production. Approximately one-
  half of the total methanol production will be used as a raw material in the
  Company's acetic acid unit, replacing methanol currently purchased from
  third parties. The Company believes that both its acetic acid expansion and
  new methanol plant construction will be completed for significantly less
  than the typical capital cost of a new plant.     
 
    Pursue Growth Opportunities in Pulp Chemicals. The Company's strategy in
  pulp chemicals is to capture a significant portion of the growing North
  American demand for sodium chlorate derivatives in pulp bleaching
  applications. To this end, the Company is constructing a new 110,000 ton
  per year sodium chlorate plant in Valdosta, Georgia, scheduled to begin
  production in late 1996. The new facility will increase the Company's total
  annual sodium chlorate capacity by 30% to nearly 460,000 tons. The plant
  site was selected because of its proximity to existing customers (currently
  being supplied by the Company's Canadian plants) and its access to
  competitively priced electricity, which represents the most significant
  variable production cost in sodium chlorate manufacturing. In addition to
  the Valdosta plant, the Company has recently debottlenecked each of its
  four Canadian sodium chlorate plants to add incremental production
  capacity.
 
    Continue to Build Strong Industry Partnerships in Petrochemicals. The
  Company plans to build on its strategy of securing long-term supply
  contracts with key customers. The Company believes that it must provide
  high quality products and superior customer service to maintain these long-
  term relationships and has implemented management practices to insure
  continuous improvement in these areas. Approximately 25% of the Company's
  styrene and 40% of its acrylonitrile are manufactured under long-term
  conversion agreements and 100% of its acetic acid, plasticizers and
  tertiary butylamine are sold under long-term contracts which provide for
  production cost reimbursement plus profit sharing. The Company believes
  such agreements help insulate its operating performance, to some extent,
  from the effects of declining markets
 
                                      40
<PAGE>
 
  and changes in raw material prices, while allowing it to share in the
  benefits of favorable market conditions. In addition, the Company's long-
  term, high volume focus allows it to maintain relatively low selling,
  general and administrative expenses.
     
    Implement a Focused Acquisition Strategy. The Surviving Corporation will
  pursue a disciplined acquisition strategy focusing on chemical businesses
  and assets which produce either:     
 
    . The same products as the Company presently manufactures, further
      strengthening its market position and providing cost efficiencies in
      its base businesses;
 
    . Products which provide upstream or downstream integration from the
      Company's base businesses, enhancing the Company's manufacturing
      position within a product chain; or
 
    . Products which are complementary to the Company's base businesses,
      further diversifying the Company's product and market positions and
      reducing its overall sensitivity to economic cycles and pricing
      fluctuations.
 
  Employee Benefits. Pursuant to the Merger Agreement, the Surviving
Corporation will provide or cause to be provided to those employees of the
Company and its Subsidiaries who continue their employment after the Effective
Time with benefits (including participation in an employee stock ownership
plan) which, in the good faith determination of the Surviving Corporation, are
substantially as favorable in the aggregate as those currently provided by the
Company, subject to such modification as may be required by applicable law,
for a period of at least two years after the Closing Date. Following the
Merger, the Surviving Corporation will have the following employee benefits
plans:
 
    Pension Plans. The Company has maintained a defined benefit Salaried
  Employees' Pension Plan (the "Salaried Pension Plan") covering
  substantially all salaried employees, including executive officers, an
  Hourly Paid Employees' Pension Plan (the "Hourly Pension Plan") covering
  substantially all hourly paid employees, a Pension Benefit Equalization
  Plan (the "Equalization Plan"), and a Supplemental Employee Retirement Plan
  (the "Supplemental Plan"). The Salaried Pension Plan, the Hourly Pension
  Plan, the Equalization Plan, and the Supplemental Plan, as well as similar
  plans for Canadian employees, will remain in place following the Merger.
 
    Welfare Plans. The Company has maintained Welfare Plans for medical
  benefits, dental benefits, prescription drug benefits, life insurance,
  disability income and flexible spending accounts. These Welfare Plans will
  remain in place after the Merger.
 
    Employee Stock Ownership Plan. In connection with the Merger, a New ESOP
  will be established which covers substantially all full time eligible
  employees. The New ESOP will borrow $6.5 million from Chemicals (the
  "Chemicals ESOP Loan") and use the proceeds therefrom to purchase shares of
  STX Acquisition common stock at the Closing of the Merger which will be
  converted into 541,662 shares of Surviving Corporation common stock. The
  Chemicals ESOP Loan is payable in 16 equal quarterly installments, and
  bears interest at interest rates based on the Base Rate (as defined in the
  Credit Agreement) or the Eurodollar Rate (as defined) plus a margin. The
  shares of STX Acquisition common stock to be purchased by the New ESOP will
  be pledged as security for the ESOP Term Loan (the "ESOP Pledge"), and such
  shares will be released and allocated to New ESOP participants' accounts as
  the ESOP Term Loan is discharged. It is anticipated that the annual
  employer contributions to the New ESOP will be in amounts sufficient to
  enable the New ESOP to discharge its indebtedness under the Chemicals ESOP
  Loan. Shares released under the ESOP Pledge will be allocated to each
  participant based on his or her compensation relative to all compensation
  for all New ESOP participants. Until the Chemicals ESOP Loan is paid in
  full, contributions will be used to pay the outstanding principal and
  interest on the Chemicals ESOP Loan. Distributions from the New ESOP will
  be made in cash or Surviving Corporation common stock upon a participant's
  retirement (as contemplated under the New ESOP), death, disability or
  termination of employment. If Surviving Corporation common stock is
  distributed to a participant, the participant may, within two 60-day
  periods, require Chemicals to purchase all or a portion of such Surviving
  Corporation
 
                                      41
<PAGE>
 
  common stock at its fair market value as determined by an independent
  appraiser as of an annual valuation date (the "Put Options"). The first 60-
  day period commences on the date the participant receives a distribution of
  Surviving Corporation common stock and the second 60-day period commences a
  year from such date. Pursuant to an Employee Stockholders Agreement to be
  entered into by each participant, if a participant fails to exercise either
  of the two Put Options, the participant may transfer the shares of
  Surviving Corporation common stock only upon receipt of a bona fide third
  party offer and only after first offering the shares to the New ESOP, then
  to the Surviving Corporation, and then to all other employee stockholders
  party to such Employee Stockholders Agreement or the Stockholders
  Agreement. Employees of the Surviving Corporation will own approximately 5%
  of the Surviving Corporation's outstanding common stock through the New
  ESOP after the Merger.
 
    Savings Plan. The Savings and Investment Plan (the "Savings Plan") covers
  substantially all full time employees of Chemicals, including executive
  officers, and will be amended and continued after the Merger. The Savings
  Plan is designed to qualify under Section 401(a) of the Code. Each
  participant has the option to defer taxation on a portion of his or her
  earnings by directing the Company to contribute a percentage of such
  earnings to the Savings Plan. A participant may contribute up to a maximum
  of 15% of eligible earnings to the Savings Plan, subject to certain
  limitations set forth in the Code for certain highly compensated employees.
  A "highly compensated" participant, as defined in Section 414(q) of the
  Code, can contribute no more than the allowable percentage as determined by
  discrimination testing.
 
    Stock Option Plan. The Surviving Corporation expects to adopt a stock
  option plan (the "Option Plan") after the Merger. The Option Plan will be
  administered by the Compensation Committee of the Board of Directors (the
  "Committee"). Option grants under the Option Plan may be made to directors
  and key employees selected by the Committee. The total number of shares of
  Surviving Corporation common stock subject to options granted under the
  Option Plan may not exceed approximately       % of the Surviving
  Corporation common stock on a fully diluted basis. Subject to the approval
  of the Option Plan by the holders of a majority of the Surviving
  Corporation common stock, the Committee may grant "incentive stock options"
  within the meaning of Section 422 of the Code. The Committee also may grant
  "nonstatutory options," which are not intended to conform to Section 422 of
  the Code. The Option Plan will provide for the discretionary grant of
  options to purchase shares of Surviving Corporation common stock. The
  exercise price of incentive stock options must not be less than the fair
  market value of a share of Surviving Corporation common stock on the date
  of grant, and the exercise price of nonstatutory options must be at a price
  not greater than the fair market value of a share of Surviving Corporation
  common stock on the date of grant as determined by the Committee in its
  sole discretion. The Committee may provide that the options will vest
  immediately or in increments over a period of time. No option will be
  transferable by a grantee other than upon death. Upon the death or
  disability of any grantee, any unvested options will expire, but the vested
  options may be exercised during the next succeeding three months, unless a
  longer period of time is determined by the Committee. Upon the termination
  of employment of any grantee for any other reason, all vested and unvested
  options will expire, unless otherwise determined by the Committee. The
  Option Plan will terminate no later than 10 years after its adoption;
  however, any options outstanding upon termination of the Option Plan will
  remain in effect until exercised or terminated pursuant to the terms of the
  agreement under which they were granted. A participant in the Option Plan
  may, upon receiving approval from the Committee in its sole discretion,
  relinquish all or a portion of his or her options for an amount in cash
  equal to the difference between the fair market value of the Surviving
  Corporation common stock corresponding to the options being relinquished on
  the day of relinquishment, less the total option price for such
  corresponding shares.
 
    Profit Sharing Plan. Chemicals expects to establish a Profit Sharing Plan
  covering all full time employees, including executive officers. The Profit
  Sharing Plan will be administered by the Committee. Amounts paid under the
  Profit Sharing Plan will constitute taxable income in the year received and
  will be based on Chemicals' financial performance over a period of time to
  be determined. The Committee will determine a percentage of the amount by
  which the Surviving Corporation's earnings before depreciation,
  amortization, interest and taxes (and before profit sharing) exceed a
  minimum level. If earnings exceed this minimum level, Chemicals may make
  distributions to employees. The Committee may change the amount
 
                                      42
<PAGE>
 
  set aside for profit sharing and the proportion of such amount allocated to
  an individual employee or group of employees. The Profit Sharing Plan will
  not be qualified under Section 401(a) of the Code.
 
DIFFERENCES IN THE RIGHTS OF HOLDERS OF ROLLOVER SHARES
 
  The Merger Agreement provides that the Certificate of Incorporation of the
Company will be amended at the Effective Time to read in its entirety as set
forth on Exhibit B to the Merger Agreement. See "AMENDMENTS TO CERTIFICATION
OF INCORPORATION."
 
                                  THE MERGER
 
TERMS OF THE MERGER
   
  The following is a summary of the material provisions of the Merger
Agreement, a copy of which is included as Annex A to this Proxy Statement.
Such summary is qualified in its entirety by reference to the Merger
Agreement.     
 
  General. The Merger Agreement sets forth the terms and conditions upon and
subject to which the Merger is to be effected. If the Merger Agreement is
approved and adopted by the stockholders in accordance with the DGCL and the
other conditions contained in the Merger Agreement are satisfied or waived,
STX Acquisition will be merged with and into the Company, with the Company
continuing as the Surviving Corporation. As a result of the Merger, at the
Effective Time, Chemicals will become a wholly-owned subsidiary of the
Company, and, at the Effective Time, the Company will transfer substantially
all of its operating assets and associated liabilities to Chemicals.
 
  Consideration Paid to Record Stockholders. Pursuant to the Merger Agreement,
the Company's stockholders, (other than those stockholders who have not voted
in favor of the Merger and who have otherwise properly exercised their rights
for appraisal of such shares in accordance with Section 262 of the DGCL), will
receive the following consideration in the Merger:
 
    Cash Payment. Pursuant to the Merger Agreement, at the Effective Time,
  each share of Common Stock then outstanding, except Dissenting Shares,
  Rollover Shares and shares of Common Stock owned by STX Acquisition or held
  in the Company's treasury, will automatically be converted into the right
  to receive a $12.00 Cash Payment from the Surviving Corporation. No
  interest will accrue or be paid on the Cash Payment. Assuming Rollover
  Elections for the Maximum Rollover Amount have been made, the Company's
  stockholders will receive an aggregate of approximately $608.3 million in
  Cash Payments. Upon surrender of certificates representing shares of Common
  Stock and other required documents to the Exchange Agent, the Exchange
  Agent will distribute by bank check the cash price of $12.00 per share for
  each share represented by such certificates to the holder thereof.
 
    Rollover Shares. Pursuant to the Merger Agreement, Record Stockholders
  may make a Rollover Election as to all or a portion of their shares of
  Common Stock, which election will, subject to pro rata reduction in the
  event the Maximum Rollover Amount is exceeded, entitle the stockholder to
  convert each Rollover Share into the right to retain a share of common
  stock of the Surviving Corporation. A Rollover Election may be made by any
  person who is a record holder of Common Stock on the Election Date. If the
  Maximum Rollover Amount has been exceeded, the existing stockholders of the
  Company will beneficially own approximately 46% of the common stock of the
  Surviving Corporation at the Effective Time.
 
  Issuance of Common Stock to STX Acquisition Stockholders. At the Effective
Time, the issued and outstanding shares of common stock of STX Acquisition
will be converted into shares of common stock of the Surviving Corporation.
Depending on the number of Rollover Shares, the common stock of STX
Acquisition will be converted into up to 8,589,580 shares of common stock of
the Surviving Corporation, representing approximately 79% of the total
outstanding shares of the Surviving Corporation.
 
                                      43
<PAGE>
 
  Asset Transfer. Pursuant to the terms of the Merger Agreement, at the
Effective Time, the Company will transfer substantially all of the operating
assets and associated liabilities to Chemicals, and Chemicals will expressly
assume and agree to pay, perform and discharge when due any and all
liabilities of the Company related to such assets and properties. If the
conveyance of any particular asset or property (i) would be ineffective as
between the Company and Chemicals without the consent of any third party, (ii)
would cause the impairment or loss of ownership of such asset or property,
(iii) would result in any material penalty or other detriment to the Company
or Chemicals or (iv) is prohibited by law or any judgment, order or decree of
any government or governmental agency, then such asset or property will not be
conveyed until such time as such consent has been obtained or such
circumstance has been rectified.
 
  Conditions to Consummation of the Merger. Under the Merger Agreement, the
obligations of the Company and STX Acquisition to effect the Merger are
subject to the fulfillment at or prior to the Closing Date of certain
conditions, including the following: (a) at the Special Meeting, the Merger
Agreement shall have been approved by the affirmative vote of the holders of a
majority of the issued and outstanding shares of Common Stock entitled to vote
thereon; (b) no governmental authority shall have enacted or issued any
statute, rule, regulation, executive order, decree, injunction or other order
or legal restraint that has the effect of making the Merger illegal or
otherwise preventing or prohibiting the consummation of the Merger and other
transactions contemplated by the Merger Agreement; (c) any waiting period
under the HSR Act (as defined below) shall have terminated or expired; (d) the
Registration Statement shall have become effective and no stop order
suspending such effectiveness shall have been issued and remain in effect; and
(e) all governmental approvals legally required for the consummation of the
merger shall have been obtained and be in effect on the Closing Date.
 
  In addition, the obligation of STX Acquisition to effect the Merger and to
perform its obligations contemplated thereby is subject to the prior
fulfillment of certain other conditions, including: (a) the accuracy of the
representations and warranties of the Company set forth in the Merger
Agreement; (b) performance or compliance by the Company with all conditions,
agreements and obligations required by the Merger Agreement to be complied
with by it on or prior to the Closing Date; (c) STX Acquisition having
received the legal opinion(s) of Piper & Marbury and/or F. Maxwell Evans,
counsel for the Company; (d) STX Acquisition having received comfort letters
from Arthur Andersen LLP and/or Coopers & Lybrand L.L.P.; (e) there having
been no material adverse change in the business, operations, properties,
assets, condition, results of operations or prospects of the Company and its
subsidiaries, taken as a whole (excluding effects in such prospects caused by
economic, tax or other matters of general applicability or matters generally
affecting any of the industries in which the Company or any of its
subsidiaries conduct business); (f) STX Acquisition having obtained the
Financing; and (g) the Company having received from each holder of stock
options and other rights to acquire shares of Common Stock of the Company,
SARs, and phantom shares, an instrument in writing effectively canceling such
rights.
 
  The obligation of the Company to effect the Merger is also subject to the
prior fulfillment of certain other conditions, including: (a) the accuracy of
the representations and warranties of STX Acquisition set forth in the Merger
Agreement; (b) performance or compliance by STX Acquisition with all
conditions, agreements and obligations required by the Merger Agreement to be
complied with by it on or prior to the Closing Date; (c) the stockholders of
STX Acquisition having entered into the Tag-Along Agreement; and (d) the
Company having received legal opinion(s) of Andrews & Kurth L.L.P. and/or
Richards, Layton & Finger.
   
  Either STX Acquisition or the Company might choose to waive one or more of
any condition to its obligation to close. It is likely that any condition not
deemed material to the transaction could be waived if necessary.     
 
  Representations and Warranties. The Merger Agreement contains various
representations and warranties of the Company and STX Acquisition, including
representations and warranties of each such party as to: (a) their (i) due
organization, valid existence and good standing, (ii) corporate power and
authority to execute and deliver the Merger Agreement and to consummate the
transactions contemplated thereby, and (iii) due and valid authorization and
approval of the Merger Agreement, subject, in the case of the Company, to the
approval of the
 
                                      44
<PAGE>
 
Merger Agreement and the Merger by the stockholders of the Company in
accordance with the DGCL and the Merger Agreement; (b) the absence of the need
for governmental approvals and consents in connection with the Merger
Agreement; (c) the absence of any violation, breach, termination,
acceleration, default or creation of a lien under any contract to which it is
a party or its Charter or Bylaws of the Company; and (d) the accuracy of
information supplied.
 
  The Company has further represented and warranted to STX Acquisition as to,
among other things: (a) its capitalization; (b) its filings under the
Securities Act of 1933, as amended, and the Securities Exchange Act of 1934,
as amended, since September 30, 1994 (the "Company SEC Documents"); (c) the
absence of certain undisclosed liabilities; (d) the absence of certain
material adverse changes since September 30, 1995; (e) certain bankruptcy
matters; (f) certain tax, employee benefit, labor, intellectual property and
environmental matters and certain material contracts; and (g) compliance with
applicable laws and the absence of certain litigation.
 
  None of the representations or warranties of the Company or STX Acquisition
will survive the Effective Time.
 
  Certain Covenants. The Company and STX Acquisition covenanted as to certain
matters in the Merger Agreement, including, among others, the following:
 
    Conduct of Business of the Company. The Merger Agreement provides that,
  except as otherwise expressly provided therein or agreed to in writing by
  STX Acquisition, during the period from April 24, 1996 to the Effective
  Time, the Company and each of its Subsidiaries will conduct its operations
  according to its ordinary course of business consistent with past practice,
  and the Company and each of its Subsidiaries will use its reasonable best
  efforts to preserve intact its business organization, to keep available the
  services of its officers and employees and to maintain existing
  relationships. In addition, the Merger Agreement further provides that,
  except as disclosed therein or agreed to in writing by STX Acquisition,
  neither the Company nor any of its Subsidiaries will: amend its charter or
  bylaws; split, combine or reclassify any shares of its capital stock or
  declare, set aside or pay any dividend with respect thereto; issue or agree
  to issue any additional shares or securities convertible into or
  exercisable or exchangeable for, or other rights of any kind to acquire,
  any shares of its capital stock; or acquire or agree to acquire any
  business or division thereof of any person. Additionally, except in the
  ordinary course of business until the Effective Time, neither the Company
  nor any of its Subsidiaries will sell, lease, encumber or in any other way
  dispose of any of its assets; incur or guarantee additional indebtedness in
  excess of $5 million on a consolidated basis; settle any claims,
  liabilities or losses, including tax liabilities in excess of $1.5 million;
  modify or terminate any material contract to which it is a party;
  materially modify or commit to materially modify any of its accounting
  procedures; or make or commit to make any capital expenditure which, when
  added to all other capital expenditures made after September 30, 1995 and
  prior to the Effective Time, exceeds $10 million. The Company has also
  agreed to confer with STX Acquisition on a regular basis concerning
  operational matters and to give STX Acquisition prompt notice of any event
  which has resulted or could reasonably be expected to result in a breach of
  any representation or warranty or a Material Adverse Effect.
 
    No Solicitation and Related Matters. Under the Merger Agreement, the
  Company agreed that prior to the Effective Time it would cease any
  discussions or negotiations with any parties (other than STX Acquisition)
  relating to the direct or indirect acquisition or purchase of all or any
  substantial amount of the business or assets of the Company or any of its
  Subsidiaries, or any Common Stock or other equity interest of the Company
  or any of its Subsidiaries, whether by merger, consolidation, business
  combination, sale of assets, sale of securities, tender offer, exchange
  offer, recapitalization, liquidation, dissolution or otherwise, and whether
  for cash, securities or any other consideration or combination thereof (an
  "Acquisition Transaction"). The Company has also agreed not to solicit,
  initiate or encourage (including by way of furnishing information) or to
  take any other action to facilitate any Acquisition Transaction, and the
  Company has also agreed to use its reasonable best efforts to cause its
  officers, directors, employees, and other representatives not to solicit,
  initiate or encourage or to participate in any discussions in connection
  with any Acquisition Transaction. However, if the Board reasonably
  determines in good faith after
 
                                      45
<PAGE>
 
  consultation with its outside independent financial advisors that providing
  information to a financially capable person could lead to an Acquisition
  Transaction more favorable to the stockholders of the Company than the
  Merger, and after consultation with outside legal counsel, reasonably
  determines in good faith that there is a significant risk that failure to
  provide information would constitute a breach of fiduciary duty to the
  Company's stockholders, the Company may, in response to any offer or
  proposal for an Acquisition Transaction ("Takeover Proposal") furnish
  information to any potential acquirer and participate in negotiations for a
  Takeover Proposal. The Company has further agreed that neither it nor its
  Board will withdraw, modify, or propose to withdraw or modify the Board's
  recommendation of the Agreement or the Merger or recommend any Takeover
  Proposal unless the Board reasonably determines in good faith after
  consultation with its financial advisor that a Takeover Proposal is more
  favorable to the stockholders of the Company than the Merger and in the
  best interests of the stockholders of the Company and after consultation
  with its outside legal counsel that there is significant risk that the
  failure to take such action would constitute a breach of duty to the
  Company's stockholders. In the event that the Board decided to withdraw its
  approval or recommendation of the Agreement and the Merger, or approve or
  cause to be accepted a Takeover Proposal, the Company is required to
  provide STX Acquisition written notice of its receipt of the Take Over
  Proposal seven (7) days prior to its formal acceptance of a Takeover
  Proposal, and is required to pay STX Acquisition or its designee a breakup
  fee of $8 million. In order for the Board to accept any Takeover Proposal,
  the Takeover Proposal must relate either to the acquisition of more than
  fifty percent (50%) of the shares of Company Common Stock outstanding, or
  substantially all of the assets of the Company and its Subsidiaries.
 
    Employee Matters. For a description of the treatment in the Merger of
  Options, SARs and restricted stock awards under the Omnibus Plan and
  certain agreements among the parties relating to employee compensation and
  benefits, see "THE MERGER--Interests of Certain Persons in the Merger."
 
    Dissenting Shares; Shares of Common Stock Owned by STX Acquisition or
  Held in Treasury. Dissenting Shares will become the right to receive such
  consideration as may be determined to be due pursuant to Section 262 of the
  DGCL. Shares of Common Stock owned by STX Acquisition or held in the
  Company's treasury will be canceled and retired without any consideration
  paid therefor. See "--Appraisal Rights of Dissenting Stockholders" and
  Annex C to this Proxy Statement.
 
    Termination. Upon termination, the Merger Agreement will become void and
  have no effect, without liability on the part of any party thereto (except
  for the breakup fee described above), except that termination of the Merger
  Agreement shall not relieve any party from liability for any willful breach
  any representation, warranty, covenant or agreement contained in the Merger
  Agreement or its obligation to pay its own expenses and costs.
 
    The Company and STX Acquisition can mutually consent in writing to
  terminate the Merger Agreement and abandon the Merger at any time prior to
  the Effective Time, whether before or after the approval by the
  stockholders of the Company. STX Acquisition can terminate the Merger
  Agreement prior to the Effective Time in the event that the holders of more
  than 10% of the issued and outstanding shares of Common Stock entitled to
  vote on the adoption of the Agreement have properly demanded appraisal of
  such shares in accordance with Section 262 of the DGCL. The Company can
  terminate the Merger Agreement prior to the Effective Time if STX
  Acquisition has not arranged the Financing and satisfied its funding
  conditions with respect thereto by August 31, 1996.
 
    Additionally, the Merger Agreement can be terminated and the Merger
  abandoned prior to the Effective Time by either party if: (i) the Merger is
  not consummated on or before October 31, 1996 other than due to a material
  breach of any representation, warranty, agreement or covenant contained in
  the Merger Agreement, or otherwise on account of delay or default by the
  party seeking to terminate the Merger Agreement; (ii) the Merger Agreement
  or Merger is enjoined by a final, nonappealable court order not entered by
  the party seeking to terminate the Merger Agreement and such party shall
  have used reasonable means to prevent the entry of such order, (iii) the
  approval and adoption of the Merger Agreement by the stockholders of the
  Company at the Special Meeting (or any adjournments thereof) is not
  obtained, unless
 
                                      46
<PAGE>
 
  due to delay or default on the part of the party seeking to terminate the
  Merger Agreement; (iv) the Company accepts a Takeover Proposal in
  accordance with the terms of the Merger Agreement; (v) the party not
  seeking to terminate the Merger Agreement (a) fails to perform in any
  material respect any of its covenants in the Merger Agreement and (b) does
  not cure such default in all material respects within 30 days after the
  notice of such default is given to such party; or (vi) the party not
  seeking to terminate the Merger Agreement shall have breached any of its
  representations and warranties set forth in the Merger Agreement, which
  breach cannot be cured prior to the Closing and has not been waived by the
  party seeking to terminate the Merger Agreement.
 
    Fees and Expenses. Each party has agreed to bear its own expenses and
  costs in connection with the Merger Agreement and the transactions
  contemplated thereby, whether or not the Merger is consummated, subject to
  the provisions of the breakup fee described above.
 
    Extension and Waivers. The Merger Agreement provides that, at any time
  prior to the Effective Time, the Company, on the one hand, and STX
  Acquisition, on the other hand, may in writing (i) extend the time for the
  performance of any of the obligations or other acts of the other party;
  (ii) waive any inaccuracies in the representations and warranties of the
  other party contained in the Merger Agreement or in any document,
  certificate or writing delivered pursuant thereto; or (iii) waive
  compliance by the other party with any of the agreements or conditions
  contained in the Merger Agreement. The failure of any party to assert any
  of its rights will not constitute a waiver of such rights.
 
    Amendments. Under the Merger Agreement, subject to applicable law, the
  Merger Agreement may be amended only by written agreement of STX
  Acquisition and the Company at any time prior to the Effective Time with
  respect to any of the terms contained therein, except that after the Merger
  Agreement and the Merger have been approved and adopted by the stockholders
  of the Company pursuant to the Merger Agreement, no such amendment shall be
  made which by applicable law requires further stockholder approval unless
  such further approval shall have been obtained.
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
  In considering the recommendation of the Board with respect to the Merger,
stockholders should be aware that the members of the Board and certain members
of management of the Company at the time of the Board's approval of the Merger
Agreement and the Merger had, and currently have, certain interests which may
present them with potential conflicts of interests in connection with the
Merger. The members of the Special Committee and the Board were aware of these
potential conflicts and considered them along with the other matters described
under "SPECIAL FACTORS--Fairness of the Merger."
   
  Relationships with TSG. TSG was founded in 1982 by Messrs. Gordon A. Cain
and Frank J. Hevrdejs. In 1992, Mr. Cain made a decision to reduce his level
of business activity. By December 1993, Mr. Cain had sold all of his stock in
TSG and resigned as an officer and director. Since that time, Mr. Cain has had
no equity or other financial interest in TSG, although at TSG's invitation he
has invested in three transactions organized by TSG. For marketing purposes,
Mr. Cain was described as Chairman Emeritus of TSG until November 1995, but
since December 1992 has had no role in TSG's ongoing operations. TSG
discontinued its description of Mr. Cain as Chairman Emeritus because of its
interest in a possible transaction with the Company. TSG is currently
controlled by Messrs. Hevrdejs and William C. Oehmig, the husband of Mr.
Cain's stepdaughter. Messrs. Cain and William A. McMinn assist TSG as senior
advisors on selected transactions. Although Mr. McMinn has received certain
advisory fees for such services, Mr. Cain has not. Neither Mr. Cain nor Mr.
McMinn participated in any such capacity in connection with the Merger. TSG
and Mr. McMinn recently assisted Mr. Cain with the acquisition of a company in
a transaction unrelated to the Merger. Messrs. Cain, Waggoner and McMinn,
along with principals of TSG, invested in such transaction. Messrs. Cain and
McMinn are members of the Board of Directors of the surviving corporation in
such transaction. Messrs. Cain and McMinn also sublease office space from TSG,
either directly or through companies with which they are affiliated. Messrs.
Cain and McMinn, along with Mr. J. Virgil Waggoner, Robert W. Roten, the
Company's Executive Vice-President, and Richard K. Crump, a Vice-President in
the Company, have previously co-invested with principals of TSG in several
    
                                      47
<PAGE>
 
transactions. Approximately 10 years ago, the Company's Texas City
petrochemical facility was purchased by the Company from Monsanto Company in a
leveraged buyout led by Mr. Cain (at which time he was a director and
principal stockholder of TSG) and Mr. Waggoner. On the Record Date, principals
of TSG owned 897,000 shares of Common Stock of the Company, representing
approximately 1.6% of the outstanding shares. As of the date of the Merger
Agreement principals of TSG owned 100% of the common stock of STX Acquisition.
   
  Continuing Equity Interest of Certain Persons. Certain directors and
executive officers of the Company and others will have continuing equity
interests in the Surviving Corporation following the Merger. Messrs. Frank J.
Hevrdejs and William C. Oehmig (stockholders of the Company and principals of
TSG) and Messrs. Gordon A. Cain, J. Virgil Waggoner, and Robert W. Roten, each
executed an Inducement Agreement. Pursuant to the Inducement Agreement,
Messrs. Cain, Waggoner and Roten each agreed to make Rollover Elections as to
a portion of their shares of Common Stock (an aggregate of 1,404,254 Rollover
Shares), subject to pro rata reduction with Rollover Elections made by other
stockholders of the Company if the Maximum Rollover Amount is exceeded.
Messrs. Hevrdejs and Oehmig agreed to make Rollover Elections as to 100% of
their Common Stock (an aggregate of 897,000 Rollover Shares) provided that
their Rollover Shares will not be subject to pro rata reduction. Assuming
Rollover Elections do not exceed the Maximum Rollover Amount, following the
Merger, Messrs. Cain, Waggoner and Roten would collectively own approximately
12.9% of the outstanding shares of common stock of the Surviving Corporation
and Messrs. Hevrdejs and Oehmig would collectively own a minimum of 8.2% of
such outstanding shares.     
   
  Although the senior officers and directors of the Company will have an
opportunity to elect to retain Rollover Shares in the same fashion as other
shareholders, no senior officer or director of the Company other than Mr.
Robert O. McAlister, Vice President--Human Resources, will be participating in
the Equity Private Placement. Mr. McAlister intends to purchase 10,706 shares
in the Equity Private Placement representing an investment of $128,472.     
 
  Omnibus Stock and Incentive Plan. Certain executive officers and directors
of the Company have previously received Options, SARs, and/or phantom stock
pursuant to the Company's Omnibus Stock and Incentive Plan (the "Omnibus
Plan"), which plan will be terminated at the Effective Time. Pursuant to the
Merger Agreement, at the Effective Time, each outstanding Option and each SAR
will be canceled and the holder of each such Option and/or SAR will be
entitled to receive in respect thereof an amount in cash equal to (i) in the
case of each share of Common Stock subject to an Option, the excess of $12.00
over the exercise price for one share of Common Stock payable upon exercise of
such Option and (ii) in the case of each SAR, the excess of $12.00 over the
grant price. Also at the Effective Time of the Merger, each share of phantom
stock will convert into the right to receive $12.00. The executive officers
and directors named in the table below held the number of outstanding Options
and SARs indicated as of the date of this Proxy Statement, and will receive
the indicated aggregate amounts before federal and state income taxes in
respect of such Options and SARs pursuant to the Omnibus Plan. No Options or
SARs have been granted to executive officers or directors under the Omnibus
Plan since October 1995.
 
<TABLE>
<CAPTION>
                                 OPTIONS   EXERCISE    SARS     GRANT   AMOUNT
                NAME           OUTSTANDING  PRICE   OUTSTANDING PRICE OF PAYMENT
                ----           ----------- -------- ----------- ----- ----------
      <S>                      <C>         <C>      <C>         <C>   <C>
      James J. Kerley.........       --     $   --     20,000    $ 4  $  160,000
      William A. McMinn.......       --         --     20,000      4     160,000
      Gilbert M. A. Portal....       --         --     20,000      4     160,000
      Frank J. Pizzitola......       --         --     20,000      4     160,000
      Raymond R. Knowland.....       --         --     20,000      4     160,000
      Robert N. Bannon........   15,000     13 3/8    131,250      4   1,050,000
      Richard K. Crump........   15,000     13 3/8         --     --           0
      Jim P. Wise.............   12,500     13 3/8         --     --           0
      F. Maxwell Evans........   10,000     13 3/8    118,130      4     945,040
      Robert O. McAlister.....   10,000     13 3/8    108,500      4     868,000
      Robert W. Roten.........   20,000     13 3/8         --     --           0
</TABLE>
 
                                      48
<PAGE>
 
Further, all restricted stock awards will vest and shares of Common Stock
covered by such awards will be treated under the Merger Agreement in the same
manner as other shares of Common Stock. The executive officers named in the
table below have been granted the number of shares of restricted stock
indicated as of the date of this Proxy Statement which were, as of the date of
this Proxy Statement, unvested to the extent set forth below:
 
<TABLE>
<CAPTION>
                NAME           DATE OF GRANT PERCENT UNVESTED RESTRICTED SHARES GRANTED
                ----           ------------- ---------------- -------------------------
      <S>                      <C>           <C>              <C>
      F. Maxwell Evans........   09/01/92           40%                33,750
      Jim P. Wise.............   10/01/94           80%                13,850
</TABLE>
 
  Benefit Arrangements. Pursuant to the Merger Agreement, the Surviving
Corporation, shall provide employees of the Surviving Corporation and the
Subsidiaries who continue their employment after the Effective Time with
benefits (including participation in an employee stock ownership plan) which,
in the good faith determination of the Surviving Corporation, are
substantially as favorable in the aggregate as those currently provided by the
Company, subject to such modification as may be required by applicable law,
for a period of at least two years after the Closing Date.
 
  In addition to the above agreements, pursuant to the employment agreement
entered into between the Company and Jim P. Wise, Vice President--Finance and
Chief Financial Officer of the Company, Mr. Wise will be entitled to receive a
lump sum payment equal to his base pay, minus withholdings or other payroll
deductions, for the remainder of the term of the agreement (which expires on
September 26, 1997) upon a change in control of the Company. The lump sum
payment will be added on Mr. Wise's base pay at the rate in effect at the time
of the change in control. The payment is the sole amount that Mr. Wise is
entitled to receive regarding the termination of the employment agreement,
however, it is in addition to any amounts that Mr. Wise would be entitled to
receive under the Company's Consolidated Termination Pay Plan for Salaried
Employees (discussed below).
 
  Prior to the Effective Date, the current directors of the Company will
resign and will be replaced by director candidates nominated by STX
Acquisition. Except for J. Virgil Waggoner, none of these candidates currently
serve on the Board of Directors of the Company. The Merger Agreement further
provides that the current officers of STX Acquisition immediately prior to the
Effective Time will be the officers of the Surviving Corporation after the
Merger. After the Effective Time, Mr. Waggoner will be the Vice Chairman of
the Board of the Surviving Corporation and Mr. Robert W. Roten will be a
director and the President and Chief Executive Officer of the Surviving
Corporation. For information concerning the directors and officers of the
Surviving Corporation following the Merger, see "DIRECTORS AND EXECUTIVE
OFFICERS OF THE SURVIVING CORPORATION."
 
  Consolidated Termination Pay Plan. On May 20, 1996, the Company adopted an
Amended and Restated Consolidated Termination Pay Plan for All Salaried
Employees of Sterling Chemicals, Inc. and its Subsidiaries, (the "Consolidated
Plan"), which supersedes and replaces all prior termination pay plans,
including the Termination Pay Plan for Salaried Employees Who are Members of
the Management Committee or Senior Management, the Termination Pay Plan for
Salaried Employees and the Termination Pay Plan for Salaried Employees of
Sterling Pulp Chemicals, Ltd. (collectively, the "Prior Plans").
 
  The Consolidated Plan provides that if, upon the occurrence of a "change of
control" and within the 24-month period following a "change of control", the
employment of any full time salaried employee of the Company (or any wholly-
owned direct or indirect subsidiary thereof, or any successor entity thereto)
is terminated for any reason (other than the employee's death, disability,
resignation, retirement or termination for cause), or such employee is
requested to accept a new job which is less than equivalent to his or her job
immediately prior to the change of control in terms of compensation, job
level, job responsibilities or credits, such employee shall be entitled to
receive termination pay. Such an event giving rise to termination pay under
this plan is defined as a "Triggering Event."
 
  The termination pay payable to any eligible employee following a Triggering
Event is equal to 36 months' pay (for certain members of senior management),
or 24 months' pay (for all other salaried employees) (such
 
                                      49
<PAGE>
 
period being referred to in either case as the "Termination Pay Period") at
the employee's base pay rate in effect at the time of the change of control,
and is payable as and when such base salary would otherwise have been payable
to such employee if such employee had not been terminated. Termination pay
under the Prior Plans was equal to 12 to 24 months' pay, and was payable in a
lump sum.
 
  In addition to the termination pay, an affected employee shall receive
continued medical, health, dental and term life insurance for the Termination
Pay Period, shall receive cash in a lump sum equal to any portion of the
employees' accounts in the ESOP or Amended and Restated Savings and Investment
Plan which would have been forfeited due to the Triggering Event, and the
present value as of the date of the Triggering Event of the actuarial
equivalent of the accrued benefit forfeited on account of the Triggering Event
under the Salaried Employees' Pension Plan, the Amended and Restated
Supplemental Employee Retirement Plan and the Pension Benefit Equalization
Plan, or other similar plans in effect for Canadian employees.
 
  Upon a Triggering Event, the affected employee shall also receive an amount
equal to the projected amount of profit sharing that would have been received
by the affected employee under the Amended and Restated Salaried Employees'
Profit Sharing Plan during the Termination Pay Period. Said amount shall be
payable in 24 or 36 equal monthly installments, depending on the length of the
employee's Termination Pay Period. Under the Prior Plans, said amount would
have been equal to that which would have been received by the affected
employee during the 12 to 24 month period in which termination pay was paid,
and would have been payable in a lump sum.
 
  The Consolidated Plan also provides for outplacement services and gross-up
payments for any excise tax imposed by Section 4999 of the Code or any
interest or penalty thereon.
   
  For purposes of the Consolidated Plan, a "change of control" means (a) the
acquisition of or the ownership of 50% or more of the total voting stock of
the Company then issued and outstanding, by any person or group of affiliated
persons, or entities not affiliated with the Company as of April 24, 1996,
either with or without the consent of the Company, or (b) individuals who were
members of the Board of the Company immediately prior to a meeting of the
stockholders of the Company involving a contest for the election of directors
do not constitute a majority of the Board immediately following such election
unless the election of such new directors was recommended to the stockholders
by the management of the Company, or (c) in addition to (a) and (b) above,
with respect to employees of Sterling Pulp Chemicals, Ltd. and Sterling Pulp
Chemicals US, Inc., only, the acquisition of or the ownership of fifty percent
(50%) or more of the total voting stock of Sterling Pulp Chemicals, Ltd. or
Sterling Canada, Inc. The Merger will constitute a "change of control" under
the Consolidated Plan. However, as there are currently no plans to terminate
any employees covered under the Consolidated Plan, no payments are expected to
be made under such plan in connection with the Merger.     
 
  Indemnification and Insurance. Pursuant to the Merger Agreement, from and
after the Effective Time, the Surviving Corporation will indemnify and hold
harmless each officer, director or employee of the Company or any of its
Subsidiaries (collectively, the "Indemnified Parties") against all claims,
losses or liabilities in connection with any claim based in whole or in part
on the fact that such Indemnified Party is or was a director, officer or
employee of the Company or any of its Subsidiaries and arising out of acts or
omissions occurring prior to and including the Effective Time to the fullest
extent permitted by the DGCL. In addition, the Certificate of Incorporation
and Bylaws of the Surviving Corporation and its Subsidiaries will include
provisions for limitation of liability of directors and indemnification of
Indemnified Parties to the fullest extent permitted under the applicable law
and shall not permit the amendment of such provisions in any manner adverse to
the Indemnified Parties, as the case may be, without the prior written consent
of such persons, for a period of six years from and after the Effective Time.
Further, in the event any such Indemnified Party is or becomes involved during
the six-year period after the Effective Time, in any capacity in any action,
proceeding or investigation in connection with any matter occurring prior to,
and including, the Effective Time, the Surviving Corporation will pay as
incurred such Indemnified Party's reasonable legal and other expenses incurred
in connection therewith. Finally, for a period of no less than six years after
the Effective Time, the Surviving Corporation will cause to be maintained,
with respect to matters occurring prior to the Effective Time, the current
policies of directors'
 
                                      50
<PAGE>
 
and officers' liability insurance maintained by the Company or, if not
available, an equivalent policy or policies for all present and former
officers and directors of the Company and the Subsidiaries having terms and
conditions no less advantageous than those in effect on the date of the Merger
Agreement.
 
CERTAIN LITIGATION
 
  Six putative class action complaints relating to the proposed Merger and the
events leading up to the Board's recommendation of the approval thereof were
filed in the Court of Chancery for the State of Delaware, New Castle County,
Delaware in April and May 1996. A seventh putative class action complaint
relating to the same matters was filed in the District Court of Harris County,
Texas in May 1996. By order dated May 22, 1996, the Court of Chancery
consolidated the six actions that had been filed in Delaware. The Company,
each of its directors, TSG, Unicorn, and STX Acquisition are named as
defendants in the Delaware actions. The Company and each of its directors are
named as defendants in the Texas action. All of the complaints generally
allege that the course of conduct taken by the directors in considering the
Company's strategic alternatives and recommending the Merger has been in
violation of the fiduciary duties to the Company's stockholders and seek
injunctive relief and unspecified damages. The Company believes that these
actions are without merit and has instructed legal counsel to vigorously
defend each action.
 
EFFECTIVE TIME OF THE MERGER
 
  If the Merger is approved at the Special Meeting, the Closing Date will be
the second business day after such stockholder approval and the other
conditions to the Merger have been satisfied or waived. The Merger will become
effective upon filing of the Certificate of Merger with the Secretary of State
of Delaware which is expected to occur on the Closing Date. See "THE MERGER--
Terms of the Merger--Conditions of the Merger."
 
REGULATORY APPROVALS
 
  The obligations of the Company and STX Acquisition to consummate the Merger
are subject to the effectiveness under the Securities Act, of the Registration
Statement filed by STX Acquisition and Chemicals to register the Securities to
be issued in the Offerings. Such Registration Statement is expected to be
effective on or prior to the date of the Special Meeting. The obligations of
the Company and STX Acquisition to consummate the Merger are also subject to
the expiration or earlier termination of any waiting period applicable to the
Merger under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended.
 
SUMMARY OF THE TERMS OF RELATED AGREEMENTS
   
  Certain related agreements were entered in connection with the execution of
the Merger Agreement. The following is a summary of the material terms of such
agreements.     
   
  Inducement Agreement. In order to induce STX Acquisition to execute the
Merger Agreement and consummate the transactions contemplated thereby, Messrs.
Frank J. Hevrdejs and William C. Oehmig (stockholders of the Company and
principals of TSG) and Mr. Gordon A. Cain, the Chairman of the Board of
Directors of the Company, Mr. J. Virgil Waggoner, a director and the Chief
Executive Officer of the Company, and Mr. Robert W. Roten, Chief Operating
Officer of the Company each executed an Inducement Agreement. Pursuant to the
Inducement Agreement, Messrs. Cain, Waggoner and Roten each agreed to make
Rollover Elections as to a portion of their shares of Common Stock (an
aggregate of 1,404,254 Rollover Shares), subject to pro rata reduction with
Rollover Elections made by other stockholders of the Company if the Maximum
Rollover Amount is exceeded. Messrs. Hevrdejs and Oehmig each agreed to make
Rollover Elections as to 100% of their Common Stock (an aggregate of 897,000
Rollover Shares) provided that their Rollover Shares would not be subject to
pro rata reduction. Assuming Rollover Elections do not exceed the Maximum
Rollover Amount, Messrs. Cain, Waggoner and Roten would collectively own
approximately 12.9% of the outstanding shares of common stock in the Surviving
Corporation and Rollover Shares retained by Messrs. Hevrdejs and Oehmig would
own a minimum of 8.2% of the outstanding shares of common stock in the
Surviving Corporation.     
 
                                      51
<PAGE>
 
  Tag-Along Agreement. The Merger Agreement provides that as a condition of
Closing the stockholders of STX Acquisition immediately prior to the Effective
Time shall have executed and delivered a Tag-Along Agreement in the form
attached to the Merger Agreement (the "Tag-Along Agreement"). In general,
under the Tag-Along Agreement, if any STX Acquisition stockholder party to the
Tag-Along Agreement (an "Obligor") proposes (either acting alone or with other
Obligors, in one or more transactions) to transfer 51% or more of the
Company's Common Stock outstanding after the Effective Time, each person
retaining Rollover Shares is allowed to participate, pro rata, in any transfer
with the Obligors, on the same price per share and economic terms and
conditions applicable to the Obligors. The Tag-Along Agreement allows certain
transfers by Obligors outside of the Tag-Along Agreement which do not require
that notice be given, or that rights to participate be allowed to
beneficiaries under the Tag-Along Agreement. The Tag-Along Agreement
terminates on the fifth anniversary of the date of the Tag-Along Agreement,
which would be on or about the date of the Effective Time.
          
  Stockholder Agreement. Purchasers of shares in the Equity Private Placement
will become parties to a Stockholder Agreement (the "Stockholder Agreement"),
which restricts transfers of shares of Surviving Corporation common stock
owned by a stockholder other than (i) Rollover Shares (except with respect to
such shares held by parties to the Inducement Agreement), and (ii) shares
distributed to such stockholder by the New ESOP or the Company's existing
Employee Stock Ownership Plan. Except for certain permitted transfers, and
subject to the Control Provision (as defined) and the Material Agreement
Provision (as defined), the Stockholders Agreement permits the stockholders
who are parties thereto (the "Holders") to transfer their shares of common
stock or any interest therein only upon receipt of a bona fide third party
offer and after first offering such shares to the New ESOP, then to the
Surviving Corporation and finally to the other Holders (the "Eligible
Offerees"). Subject to the Control Provision and the Material Agreement
Provision, the Stockholders Agreement permits the Holders to transfer their
shares of common stock or an interest therein, without first receiving a bona
fide third party offer and first offering the shares to the Eligible Offerees,
only if the transfer is: (1) between Holders; (2) by any Holder to the New
ESOP or the Surviving Corporation; (3) by any Holder to a wholly-owned
subsidiary corporation or parent corporation of such Holder and vice versa;
(4) by any individual Holder during such Holder's lifetime to a guardian of
his estate, to his spouse during marriage and not incident to a divorce, or to
certain relatives of such Holder or spouse, and to trusts for the benefit of
such Holder, his spouse, or certain relatives of such Holder or spouse, and
vice versa; (5) to the estate, heirs, beneficiaries or legatees of any
individual Holder upon his death; (6) by certain investors that are Holders to
their Associates (as defined), or the officers, directors, shareholders or
employees and certain consultants of such Holders, and certain of their
relatives and their Associates; (7) by any Holder at a price per share of
$12.00 until there has been a New ESOP valuation of the common stock at which
time the price shall be the New ESOP valuation of such common stock, to any
person who has become a director, officer or employee of the Company after the
date of the Merger; (8) by a Holder to a bank or other financial institution
for the purpose of securing a loan to a Holder to purchase shares of Common
Stock; (9) by the New ESOP to New ESOP participants, alternate payees and
beneficiaries to the extent required by law or the provisions of the New ESOP;
(10) to certain charitable organizations; (11) with the consent of the
Company, by any Holder to a qualified retirement plan sponsored by the Holder
or any corporation controlling, controlled by or under common control with
such Holder; (12) by any such qualified retirement plan to participants,
alternate payees and beneficiaries to the extent required by law; (13) made,
within one year after the Closing Date, by TSG, William C. Oehmig or Frank J.
Hevrdejs in transactions exempt from registration under the Securities Act;
(14) by any Holder which is a partnership, corporation or limited liability
company to the equity holders of such Holder as a distribution pursuant to
law, its organization documents or its dissolution; (15) by a Holder pursuant
to such Holder's rights under any registration rights agreement to which the
Company is a party or by which it is bound; or (16) by a Holder that is an
investment fund or account which is managed by an investment advisor to the
investment advisor or another fund or account managed by such advisor, and
vice versa.     
   
  The purchase price of shares of common stock under the Stockholders
Agreement is (1) the price contained in the bona fide third party offer in the
event of such an offer or (2) the fair market value of the shares being
purchased, as last determined under the New ESOP (or if no such determination
has yet been made, $12.00 per share), in the event of any other purchase
thereunder.     
 
                                      52
<PAGE>
 
   
  The Stockholders Agreement contains a provision (the "Material Agreement
Provision") prohibiting the stockholders who are parties thereto from
transferring shares of common stock if, in the reasonable judgment of the
Surviving Corporation, the transfer would cause a material breach, default,
event of default or acceleration of payments under any agreement to which the
Surviving Corporation or any of its subsidiaries is a party and under which
the indebtedness or liability of the Surviving Corporation exceeds $1.0
million.     
   
  The Stockholders Agreement contains provisions (the "Control Provision")
respecting Control Dispositions, as defined below. The Control Provision
prohibits any stockholder who is a party to the Stockholders Agreement from
initiating the acceptance of a Control Disposition offer without first
complying with the right of first refusal provisions in the Stockholders
Agreement. After compliance with applicable right of first refusal provisions
in the Stockholders Agreement, a stockholder who desires to, and is permitted
to, initiate the acceptance of a Control Disposition offer (the "Initiating
Stockholder") must give to each other holder of common stock who is a party to
the Stockholders Agreement the option to participate in the proposed Control
Disposition on a pro rata basis.     
   
  A Control Disposition is defined as any disposition or series of related
dispositions which would have the effect of transferring to any transferee or
group more than (i) 40% of the then outstanding shares of common stock, or
(ii) 15% of the shares of common stock then outstanding if thereafter the
proposed transferee would directly or indirectly have beneficial ownership of
50% or more of all of the then outstanding common stock.     
   
  By becoming a party to the Stockholders Agreement, Holders also become bound
by the Tag-Along Agreement described above. The Tag-Along Agreement provides
that if any of such Holders propose to transfer, sell or otherwise dispose of
(a "Transfer") in the aggregate 51% or more of the Surviving Corporation
common stock then issued and outstanding, the other holders of the Surviving
Corporation common stock will have the right to participate in such Transfer
on a pro rata basis.     
   
  The Stockholders Agreement requires that, at any time that the Surviving
Corporation is engaged in an underwritten public offering of its securities,
each stockholder who is a party thereto refrain from making any disposition of
common stock on a securities exchange or in the over-the-counter or any other
public trading market for the period of time requested by the Surviving
Corporation.     
   
  The Stockholders Agreement will terminate upon any of the following events:
(i) the dissolution of the Surviving Corporation; (ii) any event that reduces
the number of Holders to one in accordance with the terms thereof; (iii) a
registered public offering of Common Stock (excluding certain offerings)
resulting in net proceeds to the Company of not less than $75 million; (iv)
the written agreement of at least the Required Voting Percentage (as defined);
or (v) 10 years after the Closing Date; except that the provisions of the
Stockholders Agreement applicable to Control Dispositions that also constitute
a Transfer that is subject to the Tag-Along Agreement shall remain in force
and effect for so long as the Tag-Along Agreement remains in force and effect.
    
SOURCE AND AMOUNT OF FUNDS
 
  Financing Activities. Pursuant to the terms of the Merger Agreement, STX
Acquisition and Chemicals are required to consummate certain related
financings simultaneously with the Closing of the Merger. The Company may
terminate the Merger Agreement if STX Acquisition has not arranged the
required financing and satisfied the applicable funding obligations by August
31, 1996. The financing for the Merger will be provided through the proceeds
from the Equity Private Placement, the Offerings and borrowings under the
Credit Facility.
 
                                      53
<PAGE>
 
 Sources and Uses of Funds.
 
  The following table sets forth the estimated sources and uses of funds
required to effect the Merger, as if the Merger had occurred on March 31,
1996:
 
<TABLE>
<CAPTION>
      SOURCES OF FUNDS                                       DOLLARS IN MILLIONS
      ----------------                                       -------------------
      <S>                                                    <C>
      Credit Facility (a)...................................       $347.9
      Notes Offering .......................................        275.0
      Units Offering........................................        100.0
      Equity Private Placement (b)..........................        103.1
                                                                   ------
        Total...............................................       $826.0
                                                                   ======
<CAPTION>
      USE OF FUNDS
      ------------
      <S>                                                    <C>
      Purchase of Company Common Stock (c)..................       $640.7
      Purchase of other equity interests (d)................         14.6
      Refinance outstanding debt (e)........................        124.2
      ESOP Term Loan (f)....................................          6.5
      Estimated transaction expenses and fees (g)...........         40.0
                                                                   ------
        Total...............................................       $826.0
                                                                   ======
</TABLE>
- --------
   
(a) Consists of amounts under the Term Loans, the Revolving Credit Facility
    and the ESOP Term Loan.     
(b) Represents proceeds from the sale of STX Acquisition common stock to
    investors in the Equity Private Placement, assuming the minimum number of
    Rollover Shares. The amount of cash provided through the Equity Private
    Placement may be reduced to $70.7 million if the Maximum Rollover Amount
    is retained by existing stockholders.
(c) Represents the funding of the purchase of Company Common Stock, at $12.00
    per share, from stockholders who receive cash in the Merger, assuming the
    minimum number of Rollover Shares. The amount of funding required to
    purchase the Company Common Stock may be reduced to $608.3 million if the
    Maximum Rollover Amount is retained by existing stockholders.
(d) Pursuant to the terms of the Merger Agreement, SARs, phantom stock and
    restricted stock will be converted at the time of consummation of the
    Merger into rights to receive cash.
(e) Consists of $107.2 million outstanding under the Company's current credit
    facility and $17.0 million outstanding under a credit facility associated
    with the Company's Valdosta, Georgia sodium chlorate plant.
(f) For a description of the ESOP Term Loan, see "SPECIAL FACTORS--Conduct of
    the Company's Business After the Merger."
(g) Estimated expenses and fees include underwriters' discounts, advisory
    fees, bank fees, legal and accounting fees, printing costs and other
    transaction expenses.
   
  Equity Private Placement. Upon consummation of the Merger, STX Acquisition
will complete a private placement of shares of its common stock, which will
represent an equity contribution of approximately $103.1 million, assuming the
minimum number of Rollover Shares. This amount may be reduced to $70.7 million
if the Maximum Rollover Amount is retained by existing stockholders.
Purchasers of shares in the Equity Private Placement are expected to include
an investor group formed by TSG and Unicorn and the New ESOP. The New ESOP
will acquire its shares with the proceeds from the $6.5 million Chemicals ESOP
Loan. Upon consummation of the Transaction, the investors in the Equity
Private Placement, including principals of TSG and Unicorn, and certain
principal stockholders of the Company, including Messrs. Gordon A. Cain, J.
Virgil Waggoner and Robert W. Roten, will control the Company through the
ownership of at least approximately 75% of the outstanding shares of Surviving
Corporation common stock, assuming the Maximum Rollover Amount.     
   
  Although the senior officers and directors of the Company will have an
opportunity to elect to retain Rollover Shares in the same fashion as other
shareholders, no senior officer or director of the Company other than Mr.
Robert O. McAlister, Vice President--Human Resources, will be participating in
the Equity Private Placement. Mr. McAlister intends to purchase 10,706 shares
in the Equity Private Placement representing an investment of $128,472.     
 
 Units Offering. Simultaneously with the Closing of the Merger, STX
Acquisition will complete the Units Offering, which will provide initial
proceeds of $100 million from the sale of Units consisting of Senior Secured
 
                                      54
<PAGE>
 
   
Discount Notes Due 2008 and Warrants to acquire shares of Common Stock of the
Surviving Corporation. The Notes and the Units will be registered under a
Registration Statement filed with the Securities and Exchange Commission (File
No. 333-4343)     
   
  The Discount Notes. The Discount Notes will be issued under an Indenture
between STX Acquisition and Fleet National Bank, as trustee (the "Discount
Notes Indenture"). The terms of the Discount Notes will include those stated
in the Discount Notes Indenture and those made a part of the Discount Notes
Indenture by reference to the Trust Indenture Act of 1939 as in effect on the
date of the Discount Notes Indenture. The following summary of certain
provisions of the Discount Notes Indenture does not purport to be complete and
is subject to, and is qualified in its entirety by reference to, all of the
provisions of the Discount Notes Indenture. The form of the Discount Notes
Indenture is included as an exhibit to the Registration Statement filed by STX
Acquisition and Chemicals in connection with the Units Offering and the Notes
Offering. The terms of the Discount Notes Indenture are still being negotiated
and are subject to change.     
 
  The Discount Notes will be senior secured obligations of the Surviving
Corporation and will rank pari passu in right of payment with all senior
indebtedness of the Surviving Corporation and will be senior in right of
payment to any subordinated indebtedness of the Surviving Corporation incurred
after the Effective Time. From and after the Merger, the Surviving Corporation
will be a holding company conducting virtually all of its business through
Chemicals and other subsidiaries and having no source of operating cash flow
other than from dividends and distributions from Chemicals and other
subsidiaries. Chemicals will have no obligation to pay any amount due on the
Discount Notes and will not guarantee the Discount Notes. Therefore, the
Discount Notes will be effectively subordinated to all liabilities of the
Surviving Corporation's subsidiaries, including the Notes and trade payables.
Any rights of the Surviving Corporation and its creditors, including the
holders of the Discount Notes, to participate in the assets of any of the
Surviving Corporation's subsidiaries, including Chemicals, will be subject to
the prior claims of that subsidiary's creditors (including trade creditors).
See "--The Notes."
 
  The Discount Notes will mature on the twelfth anniversary of the date of
issuance. Cash interest will not accrue on the Discount Notes prior to the
fifth anniversary of the date of issuance. Thereafter, interest on the
Discount Notes will accrue and will be payable in cash semi-annually. The
Discount Notes will be redeemable, at the option of the Surviving Corporation
at any time, in whole or in part, on or after the fifth anniversary of the
date of issuance at specified redemption prices. Up to 35% of the Accreted
Value of the Discount Notes will be redeemable on or prior to the third
anniversary of the date of issuance, at the option of the Surviving
Corporation, from the net proceeds of one or more Public Equity Offerings (as
defined in the Discount Notes Indenture). Upon a Change of Control of the
Surviving Corporation (as defined in the Discount Notes Indenture), each
holder of the Discount Notes will have the right to require the Surviving
Corporation to repurchase all or any part of such holder's Discount Notes at
101% of the Accreted Value (as defined in the Discount Notes Indenture)
thereof, plus accrued interest to the date of repurchase.
 
  The Discount Notes Indenture contains certain covenants that, among other
things, will limit the ability of the Surviving Corporation to pay dividends
or make certain other restricted payments, incur additional indebtedness,
engage in transactions with affiliates, incur liens, engage in asset sales and
engage in sale and leaseback transactions. The Discount Notes Indenture will
also restrict the Surviving Corporation's ability to consolidate or merge
with, or transfer all or substantially all of its assets to another person.
 
  The Warrants. Each Warrant will entitle the holder to acquire shares of
Surviving Corporation common stock at an exercise price of $.01 per share. The
Warrants will be exercisable beginning on the first anniversary of date of
issuance and at any time thereafter prior to the twelfth anniversary date. The
number of shares of Surviving Corporation common stock to be acquired upon
exercise of each Warrant will be adjusted upon, among other things, certain
dividends or other distributions of Surviving Corporation common stock or a
combination or reclassification of the Surviving Corporation. Warrant holders
will have no rights as stockholders. The actual number of Warrants to be
issued in the Units Offering will not be established until the final pricing
terms of the Units are determined.
 
                                      55
<PAGE>
 
 The Notes.
   
  The Notes will be issued under an Indenture between Chemicals and Fleet
National Bank, as trustee thereunder (the "Notes Indenture"). The terms of the
Notes will include those stated in the Notes Indenture and those made a part
of the Notes Indenture by reference to the Trust Indenture Act of 1939 as in
effect on the date of the Notes Indenture. The following summary of certain
provisions of the Notes Indenture does not purport to be complete and is
subject to, and is qualified in its entirety by reference to, all of the
provisions of the Notes Indenture. The form of the Notes Indenture is included
as an exhibit to the Registration Statement on Form S-1 (No. 333-04343 ) filed
by STX Acquisition and Chemicals in connection with the Units Offering and the
Notes Offering. The terms of the Notes Indenture are still being negotiated
and are subject to change.     
 
  The Notes will be unsecured senior subordinated obligations of Chemicals and
will be subordinated in right of payment to all present and future senior
indebtedness of Chemicals, including borrowings under the Credit Facility. As
of March 31, 1996, after giving pro forma effect to the Merger, the Offerings
and the Credit Facility, Chemicals would have had $347.9 million in senior
indebtedness.
 
  The Notes will mature on the tenth anniversary of the date of issuance.
Interest on the Notes will be payable semi-annually. The Notes will be
redeemable, at the option of Chemicals at any time, in whole or in part, on or
after the fifth anniversary of the date of issuance, at specified redemption
prices. In addition, on or prior to the third anniversary of the date of
issuance, Chemicals may, at its option, redeem up to 35% of the original
principal amount of the Notes with the net proceeds of one or more Public
Equity Offerings. Upon a Change of Control of Chemicals (as defined in the
Notes Indenture), each holder of the Notes will have the right to require
Chemicals to repurchase all or any part of such holder's Notes at 101% of the
principal amount thereof, plus accrued interest to the date of repurchase.
 
  The Notes Indenture contains certain covenants that, among other things,
will limit the ability of Chemicals to pay dividends or make certain other
restricted payments, incur additional indebtedness, engage in transactions
with affiliates, incur liens, and engage in asset sales. The Notes Indenture
will also restrict Chemicals' ability to consolidate or merge with, or
transfer all or substantially all of its assets to another person.
 
 The Credit Facility.
   
  As part of the Merger, Chemicals has entered into a Credit Agreement (the
"Credit Agreement") with Texas Commerce Bank National Association, as
administrative agent (the "Agent"), for a syndicate of lenders, and Credit
Suisse and Chase Securities Inc. as co-arrangers. Funding of the Credit
Facility is subject to (i) there being no Material Adverse Effect (as defined
in the Credit Agreement), (ii) the closing of the Offerings and the Equity
Private Placement and (iii) the consummation of the Merger. The following
description summarizes certain provisions of the Credit Agreement; the
description does not purport to be complete and is subject to, and qualified
in its entirety by reference to, the provisions of the Credit Agreement,
including the definitions therein of certain terms.     
   
  The Credit Agreement provides for (i) a six and one half year revolving
credit facility providing for up to $100.0 million in revolving loans (the
"Revolving Credit Facility"), (ii) a term loan facility providing for up to
$350.0 million in term loans ("Term Loans") consisting of (x) a six and one
half year term loan of $200.0 million and (y) an eight year term loan of
$150.0 million and (iii) a four year $6.5 million ESOP Term Loan.     
   
  At closing it is anticipated that Chemicals will borrow all of the Term
Loans. The proceeds from such borrowings will be used to (i) finance the
Merger (ii) refinance certain existing indebtedness of the Company and (iii)
finance the payment of certain fees and expenses related to the Merger and the
related financings. Additionally, at the Closing, Chemicals will borrow the
entire amount of the ESOP Term Loan and lend those funds to the New ESOP,
which will use such funds to purchase STX Acquisition common stock.     
 
                                      56
<PAGE>
 
   
  The Credit Agreement requires the principal amount of the Term Loans to be
amortized in quarterly installments, beginning with the fiscal quarter ending
on December 31, 1996, plus additional mandatory prepayments based upon
consolidated excess cash flow. The ESOP Term Loan will be amortized in 16
equal quarterly installment amounts of $406,250 during its four-year term. The
Revolving Credit Facility is a six and one half year revolving line of credit
to Chemicals. Advances under the Revolving Credit Facility will be subject to
a Borrowing Base (as defined) consisting of 85% of eligible accounts
receivable and 65% of eligible inventory with an inventory cap of 50% of the
Borrowing Base.     
   
  Under the Credit Agreement, Chemicals is permitted to make optional
prepayments without premium or penalty. Prepayments of borrowings must be
accompanied by payments of all breakage costs and lenders, expenses or losses,
if any, incurred as a result of such prepayment.     
   
  Chemicals' obligations under Credit Facility will be secured by a first
priority lien on the capital stock of Chemicals' domestic subsidiaries, 65% of
the capital stock of its foreign subsidiaries and substantially all of the
domestic assets of Chemicals, including without limitation, accounts
receivable, inventory, intangibles and fixed assets and assignments of certain
material leases, licenses and contracts. In addition, the Credit Facility is
secured by a pledge by Holdings of all of the capital stock of Chemicals. A
second lien on the capital stock of Chemicals will be permitted to secure the
obligations under the Discount Notes.     
 
  The domestic subsidiaries of Chemicals will guarantee the obligations under
the Credit Facility. The six and one half year term loan, the ESOP Term Loan
and the Revolving Credit Facility initially bear interest at a rate per annum
of, at Chemicals' option, either the Eurodollar Rate (as defined) plus 2.5% or
the Base Rate (as defined) plus 1.5%. The applicable margin will be reduced
based upon Chemicals' ratio of total outstanding debt at the end of each
fiscal quarter to EBITDA for the four quarter period ending on such quarter.
The eight year term loan will bear interest at the Eurodollar Rate plus 3.0%
or the Base Rate plus 2.0%.
   
  The Credit Agreement contains numerous financial and operating covenants,
including, but not limited to, restriction on Chemicals' ability to incur
indebtedness, pay dividends, create liens, sell assets, engage in mergers and
acquisitions and refinance existing indebtedness. The Credit Agreement also
requires Chemicals to satisfy certain financial covenants and tests. In
addition, the Credit Agreement includes various circumstances that will
constitute, subject in certain cases to notice and grace periods, an event of
default thereunder.     
   
  The Credit Agreement requires Chemicals to pay the following fees in
connection with the maintenance of the Credit Agreement: (i) commitment fees
to be paid to the lenders in amounts equal to 1/2 of 1% per annum (decreasing
to .375 of 1% depending on the debt to EBITDA ratio) on the unused commitment
under the Revolving Credit Facility payable quarterly in arrears until such
time as the Revolving Credit Facility matures, and (ii) an annual
administration fee to the Agent. In addition, at closing Chemicals will pay
various fees and closing costs in connection with the origination and
syndication of the Credit Facility.     
   
  Chemicals will also be required to reimburse the Agent for all reasonable
out-of-pocket costs and expenses incurred in the preparation, documentation,
syndication and administration of the Credit Agreement and to reimburse the
lenders for all out-of-pocket costs and expenses incurred in connection with
the enforcement of their rights after a default under the Credit Agreement.
Chemicals agreed to indemnify the Agent and the lenders, certain of their
affiliates, and their respective officers, directors, employees, agents and
attorneys against certain liabilities arising out of or relating to the Credit
Agreement and the transactions contemplated thereby.     
   
  As provided for in the Credit Agreement, Sterling Pulp Chemicals, Ltd.
("Sterling Pulp") will enter into a revolving credit facility (the "Canadian
Revolver") with a Canadian financial institution to be determined. The
Canadian Revolver is expected to provide for revolving credit and bank
overdraft loans up to an aggregate of approximately $15 million, subject to a
borrowing base limitation. The Canadian Revolver will be secured by a first
lien on the inventory and accounts receivable of Sterling Pulp. The amount
available under the Canadian Revolver will represent a sub-limit under the
$100 million Revolving Credit Facility.     
 
  As a result of the Merger, the Surviving Corporation will have increased
cash requirements for debt service relating to the Notes, the Discount Notes
and the Credit Facility. Such cash requirements are expected to be funded with
internally generated funds and, to the extent necessary, with borrowings under
the Revolving Credit Facility.
 
                                      57
<PAGE>
 
APPRAISAL RIGHTS OF DISSENTING STOCKHOLDERS
 
  Record holders of shares of Common Stock are entitled to appraisal rights
under Section 262 of the DGCL ("Section 262") in connection with the Merger.
The following discussion is not a complete statement of the law pertaining to
appraisal rights under the DGCL and is qualified in its entirety by reference
to the full text of Section 262 which is reprinted in its entirety as Annex C
to this Proxy Statement. Except as set forth herein and in Annex C, holders of
shares of Common Stock will not be entitled to appraisal rights in connection
with the Merger.
 
  Under the DGCL, record holders of shares of Common Stock who follow the
procedures set forth in Section 262 and who have not voted in favor of the
Merger will be entitled to have their shares of Common Stock appraised by the
Delaware Court of Chancery and to receive payment of the "fair value" of such
shares, exclusive of any element of value arising from the accomplishment or
expectation of the Merger, together with a fair rate of interest, as
determined by such court.
 
  Under Section 262, where a merger agreement is to be submitted for adoption
at a meeting of stockholders, as in the case of the Special Meeting, not less
than 20 days prior to such meeting, the Company must notify each of the
holders of Common Stock at the close of business on the record date for such
meeting that such appraisal rights are available and include in each such
notice a copy of Section 262. This Proxy Statement constitutes such notice for
purposes of the Special Meeting. Any stockholder of record who wishes to
exercise appraisal rights should review the following discussion and Annex C
carefully because failure timely and properly to comply with the procedures
specified in Section 262 may result in the loss of appraisal rights under the
DGCL.
 
  A holder of shares of Common Stock wishing to exercise appraisal rights must
deliver to the Company, before the vote on the authorization and adoption of
the Merger Agreement at the Special Meeting, a written demand for appraisal of
such holder's shares of Common Stock. In addition, a holder of shares of
Common Stock wishing to exercise appraisal rights must hold of record such
shares on the date the written demand for appraisal is made and must continue
to hold such shares through the Effective Time.
 
  Only a holder of record of shares of Common Stock is entitled to assert
appraisal rights for the shares of Common Stock registered in that holder's
name. A demand for appraisal should be executed by or on behalf of the holder
of record fully and correctly, as the holder's name appears on the stock
certificates.
 
  If shares of Common Stock are owned of record in a fiduciary capacity, such
as by a trustee, guardian or custodian, execution of the demand for appraisal
should be made in that capacity, and if the shares of Common Stock are owned
of record by more than one person, as in a joint tenancy or tenancy in common,
the demand should be executed by or on behalf of all joint owners. An
authorized agent, including one for two or more joint owners, may execute the
demand for appraisal on behalf of a holder of record; however, the agent must
identify the record owner or owners and expressly disclose the fact that, in
executing the demand, he or she is acting as agent for such owner or owners. A
record holder such as a broker who holds Common Stock as nominee for several
beneficial owners may exercise appraisal rights with respect to the Common
Stock held for one or more beneficial owners while not exercising such rights
with respect to the Common Stock held for other beneficial owners; in such
case, the written demand should set forth the number of shares as to which
appraisal is sought and where no number of shares is expressly mentioned the
demand will be presumed to cover all Common Stock held in the name of the
record owner. Holders of Common Stock who hold their shares in brokerage
accounts or other nominee forms and who wish to exercise appraisal rights are
urged to consult with their brokers to determine the appropriate procedures
for the making of a demand for appraisal by such nominee. All written demands
for appraisal of Common Stock should be sent or delivered to Sterling
Chemicals, Inc., 1200 Smith Street, Suite 1900, Houston, Texas 77002-4312,
Attention: Secretary, so as to be received before the vote on the
authorization and adoption of the Merger Agreement and the Merger at the
Special Meeting.
 
  Within 10 days after the Effective Time, the Company, as the Surviving
Corporation, must send a notice as to the effectiveness of the Merger to each
person who has submitted a timely written demand for appraisal and
 
                                      58
<PAGE>
 
has not voted in favor of or consented to the Merger. Within 120 days after
the Effective Time, but not thereafter, the Company, or any holder of shares
of Common Stock entitled to appraisal rights under Section 262 who has
complied with the foregoing procedures, may file a petition in the Delaware
Court of Chancery demanding a determination of the fair value of such shares.
The Company is not under any obligation, and has no present intention, to file
a petition with respect to the appraisal of the fair value of the shares of
Common Stock. Accordingly, it is the obligation of the stockholders to
initiate all necessary action to perfect their appraisal rights within the
time prescribed in Section 262.
 
  Within 120 days after the Effective Time, any record holder of shares of
Common Stock who has complied with the requirements for exercise of appraisal
rights will be entitled, upon written request, to receive from the Company a
statement setting forth the aggregate number of shares of Common Stock with
respect to which demands for appraisal have been received and the aggregate
number of holders of such shares. Such statements must be mailed within 10
days after a written request therefor has been received by the Company or
within 10 days after expiration of the period for delivery of demands for
appraisal, whichever is later.
 
  If a petition for appraisal is timely filed, the Delaware Court of Chancery
(the "Court") will fix a time and place for the hearing of such petition, and,
if so ordered by the Court, notice of such hearing will be given to the
Company and the stockholders who have complied with the procedures for
perfection of their appraisal rights. At the hearing on such petition, the
Court will determine the holders of shares of Common Stock entitled to
appraisal rights and will appraise the "fair value" of the shares of Common
Stock, exclusive of any element of value arising from the accomplishment or
expectation of the Merger, together with a fair rate of interest, if any, to
be paid upon the amount determined to be the fair value. Holders considering
seeking appraisal should be aware that the fair value of the shares of Common
Stock as determined under Section 262 could be more than, the same as or less
than the value of the Merger consideration that they would otherwise receive
if they did not seek appraisal of their shares of Common Stock. The Delaware
Supreme Court has stated that "proof of value by any techniques or methods
which are generally considered acceptable in the financial community and are
otherwise admissible in court" should be considered in the appraisal
proceedings. The Court will also determine the amount of interest, if any, to
be paid upon the amounts to be received by persons whose shares of Common
Stock have been appraised. The costs of the action may be determined by the
Court and taxed upon the parties as the Court deems equitable. The Court may
also order that all or a portion of the expenses incurred by any holder of
shares of Common Stock in connection with an appraisal, including without
limitation, reasonable attorneys' fees and the fees and expenses of experts
utilized in the appraisal proceeding, be charged pro rata against the value of
all of the shares of Common Stock entitled to appraisal. No appraisal
proceeding in the Court will be dismissed with respect to any stockholder
without the approval of the Court, and such approval may be conditioned upon
such terms as the Court deems just.
 
  Any holder of shares of Common Stock who has duly demanded an appraisal in
compliance with Section 262 will not, after Effective Time, be entitled to
vote the shares of Common Stock subject to such demand for any purpose or be
entitled to the payment of dividends or other distributions on those shares
(except dividends or other distributions payable to holders of record of
shares of Common Stock as of a date prior to the Effective Time).
 
  If any holder of Common Stock who demands appraisal of shares under Section
262 fails to perfect, or effectively withdraws or loses, the right to
appraisal, as provided in the DGCL, the shares of Common Stock of such holder
will be converted into the right to receive the Merger consideration in
accordance with the Merger Agreement. A holder of shares of Common Stock will
fail to perfect, or effectively lose, the right to appraisal if no petition
for appraisal is filed within 120 days after the Effective Time. A holder may
withdraw a demand for appraisal by delivering to the Company a written
withdrawal of the demand for appraisal and acceptance of the Merger, at any
time within 60 days after the Effective Time.
 
  FAILURE TO STRICTLY FOLLOW THE REQUIREMENTS AND CONDITIONS OF SECTION 262 OF
THE DGCL FOR PERFECTING APPRAISAL RIGHTS WILL RESULT IN THE LOSS OF SUCH
RIGHTS.
 
                                      59
<PAGE>
 
  The foregoing is a summary of certain of the provisions of Section 262 of
the DGCL and is qualified in its entirety by the reference to the full text of
such Section, a copy of which is included as Annex C to this Proxy Statement.
 
                           MARKET PRICES; DIVIDENDS
   
  The Common Stock is listed on the NYSE. As of January 26, 1996, the last
full trading day prior to the announcement that the Company was considering
its strategic alternatives including the sale of the Company, the high and low
sales prices of the Common Stock, as reported by the NYSE, were $9 1/2 and $8
7/8, respectively. The high and low sales prices of the Common Stock, as
reported by NYSE, for the period January 2, 1996 through January 26, 1996 were
$9 3/8 and $8, respectively. As of April 24, 1996, the last full trading prior
to the announcement by the Company of the execution of the Merger Agreement,
the high and low sales prices of the Common Stock, as reported by the NYSE,
were $13 and $12 3/4, respectively.     
 
  On July   , 1996, the high and low sales prices of the Common Stock, as
reported by the NYSE, were $     and $     , respectively.
 
  The following table sets forth for the periods shown, the high and low sales
prices for the Company's Common Stock, as reported by the NYSE:
 
<TABLE>
<CAPTION>
                                                                HIGH    LOW
                                                                ----    ----
      <S>                                                       <C>     <C>
      Third Quarter 1994....................................... $10     $ 5 1/2
      Fourth Quarter 1994...................................... 13 3/4     9
      First Quarter 1995....................................... 13 7/8    9 3/4
      Second Quarter 1995......................................  14      10 7/8
      Third Quarter 1995.......................................  13      10 1/4
      Fourth Quarter 1995...................................... 12 7/8    8 1/4
      First Quarter 1996.......................................  9 1/4    7 1/2
      Second Quarter 1996......................................  13        8
      Third Quarter 1996 (through July   , 1996)...............
</TABLE>
   
  The following tables set forth the daily high and low closing prices for the
Company's Common Stock, as reported by the NYSE, for the periods indicated.
    
                                      60
<PAGE>
 



          [CHART APPEARS HERE THAT REPRESENTS THE DATA POINTS BELOW]

 
 
 
 
<TABLE>   
<CAPTION>
                                                                    LOW    HIGH
                                                                   ------ ------
<S>                                                                <C>    <C>
1992.............................................................. $3.875 $5.125
1993..............................................................  3.375  4.875
1994 First Quarter................................................  3.500  4.500
     Second Quarter...............................................  4.000  6.750
     Third Quarter................................................  5.500 10.000
     Fourth Quarter...............................................  9.000 13.750
1995 First Quarter................................................  9.750 13.875
     Second Quarter............................................... 10.875 14.000
     Third Quarter................................................ 10.250 13.000
     Fourth Quarter...............................................  8.250 12.875
1996 First Quarter................................................  7.500  9.250
     Second Quarter...............................................  8.000 13.000
     Third Quarter................................................ 11.125 13.000
</TABLE>    
   
  The Company has not paid dividends on the Company Stock since fiscal 1993.
Under the Merger Agreement, the Company has agreed not to pay any dividends on
the Common Stock prior to the Effective Time. Pursuant to the Credit Agreement
and the Indentures to be entered into in connection with the Financing of the
Merger, the Surviving Corporation's ability to pay cash dividends will be
materially restricted. See "THE MERGER--Source and Amount of Funds."     
 
                                       61
<PAGE>
 
                      SELECTED HISTORICAL FINANCIAL DATA
 
  The selected consolidated financial information set forth below has been
derived from previously published consolidated financial statements of the
Company, which are incorporated by reference elsewhere in this Proxy
Statement, and should be read in conjunction with, and is qualified in its
entirety by reference to, such consolidated financial statements and their
accompanying notes. The consolidated financial information set forth below (i)
as of year end and for each of the years in the five-year period ended
September 30, 1995 has been derived from audited consolidated financial
statements of the Company and (ii) as of March 31, 1995 and March 31, 1996 and
for the six-month periods then ended has been derived from unaudited
consolidated financial statements of the Company, which, in the opinion of
management, have been prepared on a basis consistent with the audited
consolidated financial statements of the Company and contain all adjustments
(consisting solely of normal recurring adjustments) necessary for a fair
presentation of the interim financial position and results of operations. The
interim period results of operations presented are not necessarily indicative
of the results to be expected for the full year. See "ADDITIONAL INFORMATION"
and "INCORPORATION BY REFERENCE."
 
<TABLE>
<CAPTION>
                                                                     SIX MONTHS
                                                                        ENDED
                                YEAR ENDED SEPTEMBER 30,              MARCH 31,
                          ----------------------------------------  --------------
                           1991    1992    1993    1994     1995     1995    1996
                          ------  ------  ------  ------  --------  ------  ------
                                        (DOLLARS IN MILLIONS)
<S>                       <C>     <C>     <C>     <C>     <C>       <C>     <C>
STATEMENT OF OPERATIONS
 DATA:
Revenues................  $542.7  $430.5  $518.8  $700.8  $1,030.2  $544.6  $382.4
Cost of goods sold......   472.4   402.6   477.9   606.9     758.6   402.7   323.6
                          ------  ------  ------  ------  --------  ------  ------
  Gross profit..........    70.3    27.9    40.9    93.9     271.6   141.9    58.8
Selling, general and
 administrative
 expenses...............     9.7    10.3    25.5    24.4      31.7    16.0    16.1
SAR program expenses
 (benefit)..............      --      --      --    21.8      (2.8)    0.5     6.7
                          ------  ------  ------  ------  --------  ------  ------
  Income from
   operations...........    60.6    17.6    15.4    47.7     242.7   125.4    36.0
Interest and debt
 related expenses, net
 of interest income.....     6.1     8.4    22.4    22.1      14.6     9.7     3.2
Other (income) expense..      --      --      --    (2.6)       --      --     3.6
                          ------  ------  ------  ------  --------  ------  ------
  Income (loss) before
   taxes and
   extraordinary item...    54.5     9.2    (7.0)   28.2     228.1   115.7    29.2
Provision (benefit) for
 income taxes...........    17.7     4.7    (1.6)    9.1      75.0    37.4    10.0
                          ------  ------  ------  ------  --------  ------  ------
  Income (loss) before
   extraordinary item
   and change in
   accounting principle.    36.8     4.5    (5.4)   19.1     153.1    78.3    19.2
Cumulative effect of
 change in accounting
 for post-retirement
 benefits other than
 pensions...............      --   (10.4)     --      --        --      --      --
Extraordinary item, loss
 on early extinguishment
 of debt, net of tax....      --      --      --      --      (3.1)     --      --
                          ------  ------  ------  ------  --------  ------  ------
  Net income (loss).....  $ 36.8  $ (5.9) $ (5.4) $ 19.1  $  150.0  $ 78.3  $ 19.2
                          ======  ======  ======  ======  ========  ======  ======
Per share data:
 Income (loss) before
  extraordinary item and
  change in accounting
  principle.............  $ 0.67  $ 0.08  $(0.10) $ 0.34  $   2.76  $ 1.41  $ 0.35
 Cumulative effect of
  change in accounting
  for post-retirement
  benefits other than
  pensions..............      --   (0.19)     --      --        --      --      --
 Extraordinary item.....      --      --      --      --     (0.06)     --      --
                          ------  ------  ------  ------  --------  ------  ------
 Net income (loss) per
  share on a fully
  diluted basis.........  $ 0.67  $(0.11) $(0.10) $ 0.34  $   2.70  $ 1.41  $ 0.35
                          ======  ======  ======  ======  ========  ======  ======
 Book value per share...  $ 2.04  $ 1.59  $ 1.27  $ 1.61  $   4.30  $ 2.93  $ 4.62
OTHER DATA:
Ratio of earnings to
 fixed charges(a).......     7.1x    1.8x     --     2.1x     11.9x    9.5x   5.2x
Deficiency of earnings
 to cover fixed charges.      --      --  $  7.3      --        --      --      --
BALANCE SHEET DATA:
Total assets............  $362.5  $608.5  $546.8  $580.9  $  609.9  $595.5  $614.5
Total long-term debt
 (including current
 portion)...............    72.6   300.2   263.9   192.6     103.6   151.4   124.2
Working capital.........    28.6    56.8    31.0    20.8      74.6    69.2    69.0
Stockholders' equity....   112.2    87.3    70.3    89.7     239.3   163.3   257.1
</TABLE>
- --------
(a) For purposes of computing these ratios, earnings consist of income from
    continuing operations before income taxes and fixed charges (excluding
    capitalized interest). Fixed charges consist of interest expense on debt,
    amortization of financing costs, capitalized interest and the portion
    (approximately one-third) of rental expense that management believes is
    representative of the interest component of rental expense.
 
                                      62
<PAGE>
 
       PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS AND OTHER INFORMATION
 
  The pro forma statements of operations presented below for the year ended
September 30, 1995, and the six months ended March 31, 1996, have been derived
from the financial statements incorporated by reference herein and give effect
to the Merger and related Financing as if they had occurred on October 1,
1994. The pro forma consolidated balance sheet at March 31, 1996, presented
below has been derived from the unaudited consolidated balance sheet
incorporated by reference herein and gives effect to the Merger and related
Financing as if they had occurred on March 31, 1996. The summary pro forma
consolidated financial data do not necessarily represent what such entities'
financial position or results of operations would have been if the Merger and
related Financing had actually been completed as of the dates indicated and
are not intended to project such entities' financial position or results of
operations for any future period or as of any date. The information presented
below should be read in conjunction with the historical Consolidated Financial
Statements of the Company and its subsidiaries and the related notes thereto
incorporated by reference in this Proxy Statement.
 
  The pro forma adjustments were applied to the respective historical
financial statements to reflect and account for the Merger as a
recapitalization. Accordingly, the historical basis of the Company's assets
and liabilities has not been impacted by the Merger.
 
                PRO FORMA CONSOLIDATED STATEMENTS OF OPERATIONS
                     FOR THE YEAR ENDED SEPTEMBER 30, 1995
                (DOLLARS IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)
 
<TABLE>   
<CAPTION>
                            THE                                            SURVIVING
                          COMPANY    PRO FORMA    CHEMICALS   PRO FORMA   CORPORATION
                         HISTORICAL ADJUSTMENTS   PRO FORMA  ADJUSTMENTS   PRO FORMA
                         ---------- -----------   ---------  -----------  -----------
<S>                      <C>        <C>           <C>        <C>          <C>
Revenues................  $1,030.2                $1,030.2                 $1,030.2
Cost of goods sold......     758.6       0.4 (a)     759.0                    759.0
                          --------    ------      --------      -----      --------
  Gross Profit..........     271.6      (0.4)        271.2                    271.2
Selling, general and
 administrative
 expenses...............      28.9       2.8 (b)      31.7                     31.7
                          --------    ------      --------      -----      --------
  Income from
   operations...........     242.7      (3.2)        239.5                    239.5
Interest expense, net...      14.6      50.1 (c)      64.7       13.7 (c)      78.4
                          --------    ------      --------      -----      --------
  Income from continuing
   operations before
   income taxes.........     228.1     (53.3)        174.8      (13.7)        161.1
Provision (benefit) for
 income taxes...........      75.0     (18.7)(d)      56.3       (4.8)(d)      51.5
                          --------    ------      --------      -----      --------
  Income from continuing
   operations...........  $  153.1    $(34.6)     $  118.5      $(8.9)     $  109.6
                          ========    ======      ========      =====      ========
Income per share from
 continuing operations
 on a fully diluted
 basis..................  $   2.76                                         $  10.59
Weighted average common
 shares outstanding.....    55.674                                           10.349(e)
Book value per share....  $   4.30                                         $ (29.93)
Other data:
Ratio of earnings to
 fixed charges(f).......      11.9x                    3.5x                     2.9x
</TABLE>    
 
     See accompanying Notes to Pro Forma Consolidated Financial Statements
 
                                      63
<PAGE>
 
                PRO FORMA CONSOLIDATED STATEMENTS OF OPERATIONS
 
                      FOR SIX MONTHS ENDED MARCH 31, 1996
                (DOLLARS IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                             THE                                           SURVIVING
                           COMPANY    PRO FORMA    CHEMICALS  PRO FORMA   CORPORATION
                          HISTORICAL ADJUSTMENTS   PRO FORMA ADJUSTMENTS   PRO FORMA
                          ---------- -----------   --------- -----------  -----------
<S>                       <C>        <C>           <C>       <C>          <C>
Revenues................    $382.4                  $382.4                  $ 382.4
Cost of goods sold......     323.6        0.2 (a)    323.8                    323.8
                            ------     ------       ------      -----       -------
  Gross Profit..........      58.8       (0.2)        58.6                     58.6
Selling, general and
 administrative
 expenses...............      22.8       (6.7)(b)     16.1                     16.1
                            ------     ------       ------      -----       -------
  Income from
   operations...........      36.0        6.5         42.5                     42.5
Interest expense, net...       3.2       28.6(c)      31.8        6.9(c)       38.7
Other (income) expense..       3.6                     3.6                      3.6
                            ------     ------       ------      -----       -------
  Income (loss) from
   continuing operations
   before income taxes..      29.2      (22.1)         7.1       (6.9)          0.2
Provision (benefit) for
 income taxes...........      10.0       (7.7)(d)      2.3       (2.4)(d)      (0.1)
                            ------     ------       ------      -----       -------
  Income (loss) from
   continuing
   operations...........    $ 19.2     $(14.4)      $  4.8      $(4.5)      $   0.3
                            ======     ======       ======      =====       =======
Income per share from
 continuing operations
 on a fully diluted
 basis..................    $ 0.35                                          $  0.03
Weighted average common
 shares outstanding.....    55.682                                           10.349(e)
Book value per share....    $ 4.62                                          $(28.21)
Other data:
Ratio of earnings to
 fixed charges(f).......       5.2x                    1.2x                      --
Deficiency of earnings
 to cover fixed charges.        --                      --                  $   1.1
</TABLE>
 
 
     See accompanying Notes to Pro Forma Consolidated Financial Statements
 
                                       64
<PAGE>
 
                      PRO FORMA CONSOLIDATED BALANCE SHEET
 
                              AS OF MARCH 31, 1996
                             (DOLLARS IN MILLIONS)
                                  (UNAUDITED)
 
<TABLE>   
<CAPTION>
                             THE                                            SURVIVING
                           COMPANY    PRO FORMA    CHEMICALS  PRO FORMA    CORPORATION
                          HISTORICAL ADJUSTMENTS   PRO FORMA ADJUSTMENTS    PRO FORMA
                          ---------- -----------   --------- -----------   -----------
<S>                       <C>        <C>           <C>       <C>           <C>
ASSETS
Current assets:
  Cash and cash
   equivalents..........    $  1.3     $   --       $  1.3     $   --        $  1.3
  Accounts receivable...     123.9                   123.9                    123.9
  Inventories...........      58.8                    58.8                     58.8
  Prepaid expenses......       4.8                     4.8                      4.8
  Deferred income taxes.       6.7                     6.7                      6.7
                            ------     ------       ------     ------        ------
    Total current
     assets.............     195.5         --        195.5         --         195.5
Property, plant and
 equipment, net.........     336.4                   336.4                    336.4
Other assets............      82.6       32.2 (g)    114.8        3.0 (g)     117.8
                            ------     ------       ------     ------        ------
    Total...............    $614.5     $ 32.2       $646.7     $  3.0        $649.7
                            ======     ======       ======     ======        ======
LIABILITIES AND
 STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable......    $ 62.3     $   --       $ 62.3     $   --        $ 62.3
  Accrued expenses......      50.8       (2.9)(h)     47.9                     47.9
  Current portion of
   long-term debt.......      13.4      (13.4)(i)       --                       --
                            ------     ------       ------     ------        ------
    Total current
     liabilities........     126.5      (16.3)       110.2         --         110.2
Long-term debt..........     110.8      512.1 (i)    622.9      100.0 (i)     722.9
Deferred income taxes...      43.6       (5.5)(j)     38.1                     38.1
Deferred credits and
 other liabilities......      76.5       (6.1)(h)     70.4                     70.4
Common stock held by New
 ESOP...................        --                      --        6.5 (k)       6.5
  Less: Unearned
   compensation.........        --                      --       (6.5)(l)      (6.5)
Stockholders' equity:
  Common stock..........       0.6       (0.5)(m)      0.1                      0.1
  Warrants..............        --                      --         -- (n)        --
  Additional paid-in
   capital (deficit)....      33.2     (224.9)(o)   (191.7)    (370.8)(p)    (562.5)
  Retained earnings
   (deficit)............     294.3     (297.6)(q)     (3.3)     294.3 (r)     291.0
  Pension adjustment....      (1.6)       1.6 (o)       --       (1.6)(s)      (1.6)
  Accumulated
   translation
   adjustment...........     (18.9)      18.9 (o)       --      (18.9)(s)     (18.9)
  Deferred compensation.      (0.1)       0.1 (h)       --                       --
                            ------     ------       ------     ------        ------
                             307.5     (502.4)      (194.9)     (97.0)       (291.9)
  Treasury stock........     (50.4)      50.4 (t)       --                       --
                            ------     ------       ------     ------        ------
  Stockholders' equity..     257.1     (452.0)      (194.9)     (97.0)       (291.9)
                            ------     ------       ------     ------        ------
    Total...............    $614.5     $ 32.2       $646.7     $  3.0        $649.7
                            ======     ======       ======     ======        ======
</TABLE>    
 
     See accompanying Notes to Pro Forma Consolidated Financial Statements
 
                                       65
<PAGE>
 
             NOTES TO PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS
 
 FOR THE YEAR ENDED SEPTEMBER 30, 1995 AND AS OF AND FOR THE SIX MONTHS ENDED
                                MARCH 31, 1996
                             (DOLLARS IN MILLIONS)
                                  (UNAUDITED)
 
  The pro forma financial data have been derived by the application of pro
forma adjustments to the Company's historical financial statements for the
periods noted. The Merger has been accounted for as a recapitalization which
will have no impact on the historical basis of assets and liabilities. The pro
forma financial data assume there are no dissenting shareholders to the
Merger.
 
    (a) Represents the amortization of organization cost pursuant to the
  Merger.
     
    (b) Represents the elimination of compensation benefit (expense)
  associated with the Company's SAR plan, which will be terminated in
  connection with the Merger. The adjustment amounts represent the SAR plan
  compensation benefit (expense) recorded in the Company's historical
  financial statements.     
 
    (c) Represents the elimination of interest expense related to the
  historical debt outstanding and the incurrence of interest expense related
  to the issuance of the Credit Facility, the Notes, and the Discount Notes
  as follows:
 
<TABLE>       
<CAPTION>
                                                                     SIX MONTHS
                                                        YEAR ENDED     ENDED
                                                       SEPTEMBER 30, MARCH 31,
                                                           1995         1996
                                                       ------------- ----------
      <S>                                              <C>           <C>
      Surviving Corporation
        Discount Notes (i)............................    $ 13.5       $  6.8
        Amortization of deferred financing costs......       0.2          0.1
                                                          ------       ------
          Total Surviving Corporation.................    $ 13.7       $  6.9
                                                          ======       ======
      Chemicals
        Interest expense on the Company's historical
         debt.........................................    $(14.8)      $ (4.4)
        Amortization of historical deferred financing
         costs........................................      (2.0)        (0.6)
        Interest expense on the Credit Facility (ii)..      29.6         14.8
        Interest expense on the Notes (iii)...........      32.3         16.2
        Amortization of deferred financing costs......       4.5          2.3
        Commitment Fee................................       0.5          0.3
                                                          ------       ------
          Total Chemicals.............................    $ 50.1       $ 28.6
                                                          ======       ======
</TABLE>    
    --------
      (i) For purposes of the pro forma statement of operations, the
    effective annual interest rate is assumed to equal 13.5%. A 1% change
    in the interest rate payable on the outstanding balance under the
    Discount Notes would change annual interest expense and cash interest
    expense by $1.0 million and $0, respectively, before the effect of
    income taxes.
 
      (ii) For purposes of the pro forma statement of operations, the
    effective annual interest rate is assumed to equal 8.5%. A 1% change in
    the interest rate payable on the outstanding balance under the Credit
    Facility would change each of annual interest expense and cash interest
    expense by $3.5 million before the effect of income taxes.
 
      (iii) For purposes of the pro forma statement of operations, the
    effective annual interest rate is assumed to equal 11.75%. A 1% change
    in the interest rate payable on the outstanding balance under the Notes
    would change each of annual interest expense and cash interest expense
    by $2.8 million before the effect of income taxes.
 
    (d) Represents the tax effect of the pro forma adjustments at a 35%
  statutory rate.
 
                                      66
<PAGE>
 
    (e) Weighted average shares outstanding after giving effect to the Merger
  and related Financing represents the 10.891 million shares of Surviving
  Corporation Common Stock issued less the 0.542 million shares of Surviving
  Corporation Common Stock held by the New ESOP, which are not considered
  outstanding for earnings per share calculations until they are allocated to
  New ESOP plan participants.
 
    (f) For purposes of computing this ratio, earnings consist of income from
  continuing operations before income taxes and fixed charges (excluding
  capitalized interest). Fixed charges consist of interest expense on debt,
  amortization of financing costs, capitalized interest and the portion
  (approximately one-third) of rental expense that management believes is
  representative of the interest component of rental expense.
 
    (g) Represents the capitalization of organization and deferred financing
  costs related to the Merger, net of expensing the historical deferred
  financing costs as follows:
 
<TABLE>
      <S>                                                             <C>    <C>
      Chemicals
        Organization and debt financing costs........................ $35.4
        Historical debt financing costs..............................  (3.2)
                                                                      -----
          Total Chemicals............................................ $32.2
                                                                      =====
      Surviving Corporation
        Debt financing costs......................................... $ 3.0
                                                                      =====  ===
</TABLE>
 
    (h) Represents the settlement of obligations pursuant to the Company's
  SARs, phantom stock and restricted stock, which will be terminated in
  connection with the Merger.
 
    (i) Represents the repayment of the Company's historical debt outstanding
  and the incurrence of debt relating to the Credit Facility, the issuance of
  the Notes, and the issuance of the Discount Notes as follows:
 
<TABLE>       
      <S>                                                              <C>
      Surviving Corporation
        Discount Notes................................................ $ 100.0
        Warrants (n)..................................................      --
                                                                       -------
          Total Surviving Corporation................................. $ 100.0
                                                                       =======
      Chemicals
        Repayment of historical Debt outstanding...................... $(124.2)
        Credit Facility...............................................   347.9
        Notes.........................................................   275.0
                                                                       -------
          Total Chemicals............................................. $ 498.7
                                                                       =======
</TABLE>    
     
    Subject to the borrowing base (as defined), the unused portion of the
  $100 million Revolving Credit Facility will be available for working
  capital and general corporate purposes, including funding $5.8 million of
  current maturities on the Term Loans.     
 
    (j) Represents the deferred tax impact of expensing historical deferred
  financing costs and settlement of obligations pursuant to the Company's
  SARs, phantom stock and restricted stock.
 
    (k) Represents the proceeds from the purchase of 0.542 million shares of
  Surviving Corporation Common Stock by the New ESOP in connection with the
  Merger. Common stock held by the New ESOP has been classified outside of
  permanent equity because, under certain conditions, participants can
  require Chemicals to purchase for cash common stock distributed to them by
  the New ESOP.
 
    (l) Represents unearned compensation expense related to Surviving
  Corporation Common Stock held by the New ESOP.
     
    (m) Represents the net effect of the Merger and related financings on the
  60.327 million shares issued at $.01 par value per share. There will be
  10.891 million shares issued subsequent to the Merger.     
 
                                      67
<PAGE>
 
    (n) The Warrants to be issued in connection with the Units Offering,
  which will be valued upon determination of the terms of the Units Offering,
  have not been valued and therefore have not been included as dilutive
  securities in calculating income per share from continuing operations on a
  fully diluted basis in the pro forma financial statements.
 
    (o) Represents (i) the contribution to Chemicals of the Company's net
  assets, except for $0.1 million attributable to common stock; net of (ii)
  cash advanced to the Surviving Corporation, comprising the new debt
  proceeds, net of debt issue and organization costs, repayment of historical
  Debt and settlement of obligations pursuant to the Company's SARs, phantom
  stock and restricted stock.
     
    (p) Represents amounts distributed to convert to cash 53.389 million
  shares of the Company's common stock for total consideration of $640.7
  million; net of the issuance of 8.048 million shares in the Equity Private
  Placement for total consideration of $96.6 million; plus $1.6 million in
  equity financing costs as a result of the Merger and related financings;
  plus historical amounts of retained earnings, pension adjustment and
  accumulated translation adjustment; net of the cash advanced to the
  Surviving Corporation per note (o). The pro forma consolidated financial
  statements have been prepared under the assumption that all outstanding
  shares of common stock are converted to cash, except for the 2.301 million
  Rollover Shares, the minimum number of Rollover Shares.     
 
    (q) Represents the contribution of the Company's net assets to Chemicals,
  net of the write-off of historical deferred financing costs and settlement
  of obligations pursuant to the Company's SARs, phantom stock and restricted
  stock, after tax effects.
 
    (r) Represents the Company's historical retained earnings.
 
    (s) Represents reinstatement of historical amounts of pension adjustment
  and accumulated translation adjustment.
 
    (t) Represents the cancellation of the 4.64 million shares of treasury
  stock.
 
                                      68
<PAGE>
 
                                CAPITALIZATION
 
  The following table sets forth (i) the unaudited consolidated historical
capitalization of the Company, (ii) the unaudited consolidated pro forma
capitalization of Chemicals as adjusted to give effect to the Merger, and
(iii) the unaudited consolidated pro forma capitalization of the Surviving
Corporation as adjusted to give effect to the Merger. See "PRO FORMA
CONSOLIDATED FINANCIAL STATEMENTS" and the Company's consolidated financial
statements and their accompanying notes incorporated by reference herein.
 
<TABLE>   
<CAPTION>
                                                       MARCH 31, 1996(A)
                                              ---------------------------------
                                                    (DOLLARS IN MILLIONS)
                                                ACTUAL         AS ADJUSTED
                                              ----------- ---------------------
                                                                     SURVIVING
                                              THE COMPANY CHEMICALS CORPORATION
                                              ----------- --------- -----------
<S>                                           <C>         <C>       <C>
Long-term debt:
  Existing credit facility...................   $107.2     $   --     $   --
  Construction loan facility.................     17.0         --         --
  Credit Facility............................       --      347.9      347.9
  Notes......................................       --      275.0      275.0
  Discount Notes.............................       --         --      100.0
                                                ------     ------     ------
Total long-term debt (b).....................    124.2      622.9      722.9(c)
Common stock held by New ESOP................       --         --        6.5
  Less: Unearned compensation................       --         --       (6.5)
Stockholders' equity:
  Common stock (d)...........................      0.6        0.1        0.1
  Warrants (e)...............................       --         --         --
  Additional paid-in capital (deficit) (f)...     33.2     (191.7)    (562.5)
  Retained earnings (deficit)................    294.3       (3.3)     291.0
  Pension adjustment.........................     (1.6)        --       (1.6)
  Accumulated translation adjustment.........    (18.9)        --      (18.9)
  Deferred compensation (g)..................     (0.1)        --        --
  Treasury stock (h).........................    (50.4)        --        --
                                                ------     ------     ------
    Total stockholders' equity...............    257.1     (194.9)    (291.9)
                                                ------     ------     ------
Total capitalization.........................   $381.3     $428.0     $431.0
                                                ======     ======     ======
</TABLE>    
- --------
(a) The Merger will be accounted for as a recapitalization due to the number
    of Rollover Shares to be retained by existing stockholders. Consequently,
    the Merger will have no impact on the historical basis of the Company's
    assets and liabilities. In addition to the adjustments reflected in the
    capitalization table, there will be adjustments to reduce current and
    long-term accrued liabilities to reflect payments to employees and
    directors of the Company for obligations under the Company's incentive
    plans.
(b) Includes pro forma current maturities of approximately $5.8 million.
   
(c) Upon consummation of the Merger, Chemicals will make a subordinated loan
    to the Surviving Corporation of approximately $448.7 million, representing
    the net proceeds of the Notes Offering and amounts initially borrowed
    under the Term Loans after repayment of existing indebtedness, purchase of
    certain equity interests and payment of Merger expenses. Such loan is
    reflected in additional paid-in capital of Chemicals and eliminated in
    consolidation.     
   
(d) Represents the net effect of the Merger and related financings on the
    60.327 million shares issued at $.01 par value per share. There will be
    10.891 million shares issued subsequent to the Merger.     
(e) Warrants to be issued in connection with the Units Offering, which will be
    valued upon determination of the terms of the Units Offering, have not
    been valued in the table above.
(f) Reflects the consideration to be paid to the stockholders in the Merger
    plus the canceled treasury stock and fees and expenses of the Merger which
    are allocated to equity accounts. Netted against these items are the
    additional paid-in capital contributed by STX Acquisition, amounts
    allocated to par value of Surviving Corporation Common Stock as a result
    of the Merger and the historical amount of additional paid-in capital.
(g) Eliminates the unvested portion of the restricted stock which was issued
    under the Company's Omnibus Stock and Incentive Plan.
(h) Treasury stock of the Company is eliminated in connection with the Merger.
 
                                      69
<PAGE>
 
                  AMENDMENTS TO CERTIFICATE OF INCORPORATION
 
  Immediately after the Effective Time, the authorized capital stock of the
Surviving Corporation will consist of 20 million shares of common stock, par
value $.01 per share. Assuming the Maximum Rollover Amount and no Dissenting
Shares, immediately after the Effective Time, there will be           shares
of Common Stock issued and outstanding. Additionally, at the Effective Time,
the Surviving Corporation will have reserved             shares of Common
Stock for issuances upon exercise of the Warrants granted in the Units
Offering.
 
CHANGE IN CERTIFICATE OF INCORPORATION AND BYLAWS
 
  At the Effective Time, the Restated Certificate of Incorporation of the
Company (the "Charter") as in effect on the date thereof shall be amended to
read in its entirety (the "Restated Charter") as set forth in Exhibit B to the
Merger Agreement. A discussion of certain provisions of the Restated Charter
that differ materially from the Charter follows.
 
NAME
 
  After the filing of the Restated Charter, the name of the Surviving
Corporation shall be "Sterling Chemicals Holdings, Inc."
 
COMMON STOCK
 
  Number of Shares Authorized. The number of shares of Common Stock that the
Surviving Corporation shall be authorized to issue shall be reduced to 20
million shares under the Restated Charter from 150 million shares under the
Charter.
 
  No Cumulative Voting. The rights to cumulative voting for the election of
directors provided in Section 214 of the Delaware General Corporation Law (the
"DGCL") shall be expressly denied by the Restated Charter.
 
PREFERRED STOCK
 
  Number of Shares Authorized. The number of shares of "blank check" preferred
stock (the "Preferred Stock") that the Surviving Corporation shall be
authorized to issue shall be reduced to two million shares under the Restated
Charter from 25 million shares in the Charter.
 
  Possible Adverse Effect. Because the Surviving Corporation's Board of
Directors shall have the authority to issue, and to determine the rights,
preferences and powers, including voting rights, of the shares of the
Preferred Stock without any further vote or action by the Surviving
Corporation's stockholders, the rights of the holders of Common Stock will be
subject to and may be adversely affected by the rights of the holders of any
Preferred Stock that may be issued in the future. In addition, the issuance of
Preferred Stock, while providing desirable flexibility in connection with
possible acquisitions and other corporate purposes, could have the effect of
making it more difficult for a third party to acquire a majority of the
outstanding voting stock of the Surviving Corporation.
 
  Par Value Per Share. The par value per share of Preferred Stock shall be
reduced from $1.00 per share in the Charter to $0.01 per share in the Restated
Charter.
 
NUMBER, ELECTION AND REMOVAL OF DIRECTORS
 
  Number of Directors. Under the Restated Charter, the number of directors of
the Surviving Corporation shall be from time to time fixed exclusively by the
Board of Directors in accordance with, and subject to the limitations set
forth in, the bylaws of the Surviving Corporation (the "Bylaws"); provided,
however, that the
 
                                      70
<PAGE>
 
Board of Directors shall at all times consist of a minimum of three and a
maximum of 15 members, subject, however, to increases above 15 members as may
be required in order to permit the holders of any series of Preferred Stock to
exercise their right (if any) to elect additional directors under special
circumstances.
 
  Nominations of Directors. Nominations of persons for election to the Board
of Directors may be made by or at the direction of the Board of Directors, in
accordance with the procedures for the nomination of directors set forth in
the Bylaws.
 
  Removal of Directors. No director may be removed before the expiration of
his term of office except by the affirmative vote of the holders of not less
than two-thirds of the issued and outstanding shares of capital stock of the
Surviving Corporation entitled to vote generally in an election of directors,
voting together as a single class. No recommendation that a director be
removed may be made to the Surviving Corporation's stockholders unless set
forth in a recommendation adopted by the affirmative vote of not less than
two-thirds of the whole Board of Directors.
 
  Vacancies and New Directorships. Any vacancies or newly-created
directorships may be filled only by a majority (or such higher percentage as
may be specified in the Bylaws) of the directors remaining in office. Each
director so appointed shall hold office until his successor is elected and
qualified or until his earlier death, resignation or removal.
 
LIMITATION OF ACCESS OF STOCKHOLDERS TO BOOKS AND RECORDS
 
  The Board of Directors is expressly authorized and empowered to determine
from time to time whether and to what extent, and at what times and places,
and under what conditions and regulations, the accounts and books of the
Surviving Corporation, or any of them, shall be open to inspection of
stockholders and, except as so determined or as expressly provided in the
Restated Charter or in any Preferred Stock designation, no stockholder shall
have any right to inspect any account, book or document of the Surviving
Corporation other that such rights as may be conferred by applicable law.
 
LIMITATION ON DIRECTORS AND OFFICERS LIABILITY
 
  The DGCL authorizes corporations to limit or eliminate the personal
liability of directors to corporations and their stockholders for monetary
damages for breach of directors fiduciary duty of care. The duty of care
requires that, when acting on behalf of the corporation, directors must
exercise an informed business judgment based on all material information
reasonably available to them. Absent the limitations authorized by such
legislation, directors are accountable to corporations and their stockholders
for monetary damages for conduct constituting gross negligence in the exercise
of their duty of care. Although the DGCL does not change directors' duty of
care, it enables corporations to limit available relief to equitable remedies
such as injunction or rescission.
 
  The Restated Charter limits the liability of the Surviving Corporation's
directors to the Surviving Corporation or its stockholders (in their capacity
as directors but not in their capacity as officers) to the fullest extent
permitted by the DGCL. Specifically, directors of the Surviving Corporation
will not be personally liable for monetary damages for breach of a director's
fiduciary duty as a director, except for liability (i) for any breach of the
director's duty of loyalty to the Surviving Corporation or its stockholders,
(ii) for acts or omissions not in good faith or which involve intentional
misconduct or a knowing violation of law, (iii) under Section 174 of the DGCL,
or (iv) for any transaction from which the director derived an improper
personal benefit.
 
  The inclusion of this provision in the Restated Charter may have the effect
of reducing the likelihood of derivative litigation against directors and may
discourage or deter stockholders or management from bringing a lawsuit against
directors for breach of their duty of care, even though such an action, if
successful, might otherwise have benefited the Surviving Corporation and its
stockholders.
 
                                      71
<PAGE>
 
ACTION AND MEETINGS OF STOCKHOLDERS
 
  No action shall be taken by the stockholders of the Surviving Corporation
except at an annual meeting or special meeting of stockholders called by the
Board of Directors or by such officer of the Surviving Corporation authorized
by the Board of Directors to call meetings of the stockholders. Stockholders
shall not be entitled to act by unanimous written consent or to call a meeting
of stockholders except as otherwise provided by law or in the Preferred Stock
designation creating any series of Preferred Stock. Stockholders shall have
the right to propose business for consideration at any meeting of
stockholders, but only as may be expressly provided in, and then only in
compliance with, the Bylaws.
 
AMENDMENT OF BYLAWS
 
  The Board of Directors is expressly authorized to adopt, alter, amend or
repeal the Bylaws. The Surviving Corporation's stockholders shall have the
power to alter, amend, expand or repeal the Bylaws but only by the affirmative
vote of the holders of two-thirds of the issued and outstanding shares of the
Surviving Corporation's capital stock entitled to vote generally at an
election of directors, voting together as a single class.
 
AMENDMENT OF RESTATED CHARTER
 
  Article VIII of the Restated Charter provides that the provisions of Article
III (the provisions relating the election, removal and number of the members
of the Board of Directors), Article IV (the provisions relating to the
adoption and amendment of the Bylaws), Article V (the provisions relating to
actions and meetings of the stockholders) and Article VII may be amended or
repealed only by the affirmative vote of the holders of two-thirds of the
issued and outstanding shares of the Surviving Corporation's capital stock
entitled to vote generally at an election of directors, voting together as a
single class.
 
SECTION 203
 
  Section 203 of the DGCL restricts certain transactions between a corporation
organized under Delaware law (or its majority-owned subsidiaries) and any
person holding 15% or more of the corporation's outstanding voting stock,
together with the affiliates or associates of such person (an "Interested
Stockholder"). Although a corporation may, at its option, exclude itself from
the coverage of Section 203, the Charter does not contain, and the Restated
Charter shall not contain, such a provision.
 
  Section 203 generally prohibits a publicly held Delaware corporation from
engaging in the following transactions with an Interested Stockholder, for a
period of three years from the date the stockholder becomes an Interested
Stockholder (unless certain conditions, described below, are met): (a) all
mergers or consolidations, (b) sales, leases, exchanges or other transfers of
10% or more of the aggregate assets of the corporation, (c) issuances or
transfers by the corporation of any stock of the corporation which would have
the effect of increasing the Interested Stockholder's proportionate share of
the stock of any class or series of the corporation, (d) any other transaction
which has the effect of increasing the proportionate share of the stock of any
class or series of the corporation which is owned by the Interested
Stockholder, and (e) receipt by the Interested Stockholder of the benefit
(except proportionately as a stockholder) of loans, advances, guarantees,
pledges or other financial benefits provided by the corporation.
 
  The three-year ban does not apply if either the proposed transaction or the
transaction by which the Interested Stockholder became an Interested
Stockholder is approved by the board of directors of the corporation prior to
the date such stockholder becomes an Interested Stockholder. Additionally, an
Interested Stockholder may avoid the statutory restriction if, upon the
consummation of the transaction whereby such stockholder becomes an Interested
Stockholder, the stockholder owns at least 85% of the outstanding voting stock
of the corporation without regard to those shares owned by the corporation's
directors who are also officers or certain employee stock plans. Business
combinations are also permitted within the three-year period if approved by
the board of directors and authorized at an annual or special meeting of
stockholders, by the holders of at least two-thirds of the outstanding voting
stock not owned by the Interested Stockholder. In addition, any transaction is
 
                                      72
<PAGE>
 
exempt from the statutory ban if it is proposed at a time when the corporation
has proposed, and a majority of certain continuing directors of the
corporation have approved, a transaction with a party which is not an
Interested Stockholder of the corporation (or who becomes such with board
approval) if the proposed transaction involves (a) certain mergers or
consolidations involving the corporation, (b) a sale or other transfer of over
50% of the aggregate assets of the corporation, or (c) a tender or exchange
offer for 50% or more of the outstanding voting stock of the corporation.
 
          STOCK OWNERSHIP OF MANAGEMENT AND CERTAIN BENEFICIAL OWNERS
   
HISTORICAL     
 
  The following table sets forth the beneficial ownership, as such term is
defined under Rule 13d-3 under the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), of the Common Stock as of May 14, 1996, by (i) each
person known by the Company to be the beneficial owner of more than 5% of the
outstanding shares of Common Stock, (ii) each director of the Company, (iii)
each senior officer of the Company, and (iv) all of the directors and senior
officers as a group. Unless otherwise indicated, each of the stockholders has
sole voting and investment power with respect to the shares beneficially
owned.
 
<TABLE>
<CAPTION>
                                                       TOTAL
                                                     BENEFICIAL     PERCENT OF
                                        SHARES HELD OWNERSHIP OF   OUTSTANDING
NAME OF BENEFICIAL OWNER                IN ESOP(1)  COMMON STOCK   COMMON STOCK
- ------------------------                ----------- ------------   ------------
<S>                                     <C>         <C>            <C>
Gordon A. Cain.........................        --     6,632,850(2)     11.9%
J. Virgil Waggoner.....................    77,311     4,113,033(3)      7.4
William A. McMinn......................        --        84,579         *
James J. Kerley........................        --       144,579         *
Gilbert M. A. Portal...................        --            --          --
Frank J. Pizzitola.....................        --        10,000         *
Raymond R. Knowland....................        --         2,500         *
Robert W. Roten........................    49,084       997,232         1.8
Robert N. Bannon.......................    28,937       163,085         *
Richard K. Crump.......................    37,391       476,533         *
Jim P. Wise............................       419        26,269         *
F. Maxwell Evans.......................     2,178        47,741         *
Robert O. McAlister....................     4,311        36,461         *
Stewart H. Yonts.......................    20,602        72,776         *
All senior officers and directors of
 the Company as a group
 (14 persons)..........................   220,233    12,807,638(4)     23.0
</TABLE>
- --------
* Less than 1%
(1) Represents shares over which the individual has sole voting power, held by
    Merrill Lynch Trust Company of Texas ("Merrill Lynch"), as trustee of the
    Sterling Chemicals, Inc. Employee Stock Ownership Plan ("ESOP") as of May
    14, 1996 and allocated to the participant's account.
(2) Includes 375,000 shares held in Mr. Cain's Keogh Plan, over which Mr. Cain
    has sole voting power and includes 2,100,000 shares held by a private
    family foundation for which Mr. Cain serves as the Chairman of the Board
    of Trustees and has shared voting and disposition powers.
(3) Includes 50,604 shares held by Mr. Waggoner's wife.
(4) Includes 220,233 shares held by Merrill Lynch, as trustee of the ESOP and
    allocated through May 14, 1996 to the accounts of such officers.
 
  Employees of the Company, including the Company's senior officers, own
6,010,518 shares of Common Stock through the ESOP, which represents 10.8% of
the outstanding shares. These shares are held of record by Merrill Lynch, as
trustee of the ESOP. The ESOP shares are allocated to the account of the
employee who has sole voting power over such shares.
 
                                      73
<PAGE>
 
   
AFTER THE TRANSACTION     
   
  The Equity Private Placement will be consummated simultaneously with the
Merger and shares of STX Acquisition common stock purchased in the Equity
Private Placement will be converted into a certain number of shares of common
stock of the Surviving Corporation. In connection with the Equity Private
Placement, the purchasers therein and certain other stockholders of the
Company have agreed to enter into a Stockholders Agreement which restricts
transfer of shares of common stock of the Surviving Corporation held by such
stockholders (with certain exceptions) unless such shares are first offered to
the New ESOP, the Surviving Corporation and finally to the other stockholders
party to the agreement. In addition, the agreement restricts the ability of
any stockholder who is a party to the agreement to initiate a disposition of a
control position in the Surviving Corporation without first complying with the
right of first refusal provisions. It is anticipated that upon consummation of
the Merger, investors in the Equity Private Placement including affiliates of
TSG and Unicorn and certain stockholders of the Company will own at least
approximately 75% of the common stock of the Surviving Corporation, assuming
the maximum number of Rollover Shares.     
   
  As of the date hereof, it is expected that upon consummation of the Merger
each of (i) various funds and accounts advised by The Clipper Group, L.P.,
(ii) Koch Equities, Inc., (iii) Fayez Sarofim & Co., (iv) Olympus Growth Fund
II, L.P., (v) Frank J. Hevrdejs and (vi) Frank P. Diassi will beneficially own
5% or greater of the outstanding capital stock of the Surviving Corporation. A
Voting Agreement among TSG, Koch Equities and the The Clipper Group, L.P. will
provide for each of such parties to vote their shares of the Surviving
Corporation common stock in favor of a nominee to the Board of Directors of
the Surviving Corporation to be selected by each of Koch Equities Inc. and The
Clipper Group L.P. The rights of Koch Equities Inc. and The Clipper Group,
L.P. to select a nominee under such Voting Agreement are terminated in the
event their ownership of the Surviving Corporation common stock represents
less than 5% of the total outstanding shares of the Surviving Corporation
common stock. In addition, persons who will acquire 10% or more of the
Surviving Corporation common stock pursuant to the Equity Private Placement
and certain other stockholders will be parties to a Registration Rights
Agreement providing certain piggyback and demand registration rights to such
stockholders.     
          
  Although the senior officers and directors of the Company will have an
opportunity to elect to retain Rollover Shares in the same fashion as other
shareholders, no senior officer or director of the Company other than Mr.
Robert O. McAlister, Vice President--Human Resources, will be participating in
the Equity Private Placement. Mr. McAlister intends to purchase 10,706 shares
in the Equity Private Placement representing an investment of $128,472.     
 
         DIRECTORS AND EXECUTIVE OFFICERS OF THE SURVIVING CORPORATION
 
  The Merger Agreement provides that the current directors of the Company will
be asked to resign and they will be replaced by the current directors of STX
Acquisition and other director candidates to be nominated by STX Acquisition.
Except for J. Virgil Waggoner, none of these candidates will come from the
current Board of Directors of the Company. The Merger Agreement further
provides that the current officers of the Company immediately prior to the
Effective Time will be the officers of the Surviving Corporation after the
Merger. The directors and executive officers of the Surviving Corporation
following the Merger will be as follows:
 
<TABLE>   
<CAPTION>
 NAME                               AGE POSITION
 ----                               --- --------
 <C>                                <C> <S>
 Frank P. Diassi..................   62 Chairman of the Board of Directors
 Robert W. Roten..................   62 President, Chief Executive Officer and Director
 Jim P. Wise......................   52 Vice President--Finance and Chief Financial Officer
 Richard K. Crump.................   50 Vice President--Commercial
 Robert N. Bannon.................   51 Vice President--Operations, President Sterling Pulp Chemicals,
                                         Ltd.
 F. Maxwell Evans.................   51 Vice President, General Counsel and Secretary
 Robert O. McAlister..............   56 Vice President--Human Resources and Administration
 Stewart H. Yonts.................   50 Treasurer
 J. Virgil Waggoner...............   68 Director (Vice Chairman)
 Frank J. Hevrdejs................   50 Director
 Hunter Nelson....................   43 Director
</TABLE>    
 
                                      74
<PAGE>
 
  Frank P. Diassi. Mr. Diassi is currently Managing General Partner of
Unicorn, a private financial organization. He organized Unicorn in 1984 and
has originated investments in over 40 entrepreneurial companies. Prior to
forming Unicorn, Mr. Diassi organized and operated several businesses ranging
from chemical distribution to the manufacturing of organic chemicals and
detergent products. In addition, he had a number of years of executive
experience with the petrochemical department of Continental Oil Company. He
has been Chairman of the Board of Hawkeye Chemical Company and was a founding
director of Arcadian Corporation, the largest nitrogen fertilizer company in
the Western hemisphere. Mr. Diassi currently serves as Chairman of the Board
of Software Plus, Inc. In addition, he serves on the Board of Mail-Well, Inc.
and several private companies. In 1991, Unicorn Ventures, Ltd. and Unicorn
Ventures II, L.P. (the "Ventures"), small business investment companies acting
under license of the Small Business Administration (the "SBA"), and of which
Unicorn was the managing general partner, filed for reorganization under
Chapter 11 of the Federal Bankruptcy Code. The Ventures were successfully
reorganized in 1995 pursuant to a plan which included full payment of general
creditors and a restructuring of the secured debt held by the SBA.
 
  Robert W. Roten. Mr. Roten spent the first 25 years of his career with
Monsanto Company and served as Vice President for sales and marketing for El
Paso Products Company from 1981 to 1983. Mr. Roten was President of Materials
Exchange, Inc., a Houston-based petrochemical and plastics marketing firm,
from 1983 until 1986. He served as Vice President--Commercial of the Company
from August 1986 until September 1991, when he became Vice President--
Corporate Development. Mr. Roten became Executive Vice President and Chief
Operating Officer of the Company in April 1993.
 
  Jim P. Wise. Mr. Wise was employed by Transco Energy Company as Executive
Vice President, Chief Financial Officer and a member of the Board of Directors
from November 1982 until September 1991. From September 1991 to July 1994, he
was Chairman and Chief Executive Officer of Neostar Group, Inc., a private
investment banking and financial advisory firm. From July 1994 to September
1994, he was Senior Vice President and Chief Financial Officer of U.S.
Delivery Systems, Inc. Mr. Wise joined the Company on September 26, 1994 as
Vice President--Finance and Chief Financial Officer.
 
  Richard K. Crump. Mr. Crump was Vice President of Materials Management for
El Paso Products Company from 1976 through 1983 and Vice President of Sales
for Rammhorn Marketing from 1984 to August 1986. He served as Director--
Commercial of the Company from August 1986 until October 1991, when he became
Vice President--Commercial.
 
  Robert N. Bannon. Mr. Bannon was employed by Monsanto Company for 15 years,
most recently as Manager, Strategic Operations--Sales. He became a Director in
the Company's Commercial Department in August 1986. He became the Director of
Manufacturing for the Company in October 1989, and served in that capacity
until he became Vice President--Operations in October 1991. Mr. Bannon has
been the President of Sterling Pulp Chemicals, Ltd. since August 1992 and is a
Director of Mainland Bank in Texas City, Texas.
 
  F. Maxwell Evans. Mr. Evans joined the law firm of Bracewell & Patterson of
Houston, Texas in 1973 and was a partner in the firm from 1979 through
December 1991. He received an L.L.M. in Environmental Law in August 1992. He
became General Counsel and Secretary of the Company on September 1, 1992 and
was promoted to Vice President, General Counsel and Secretary on July 26,
1995.
 
  Robert O. McAlister. Mr. McAlister was employed by Champlin Petroleum
Company, a subsidiary of Union Pacific Corporation from 1974 to 1987 where he
held a variety of positions in Human Resources, Marketing and Strategic
Planning. In 1987, he joined Champlin Refining and Chemicals, Inc., a joint
venture between Champlin Petroleum and PDVSA, the national oil company of
Venezuela, as Vice President of Human Resources. He joined the Company in 1991
as Director of Human Resources and was promoted to Vice President--Human
Resources and Administration on July 26, 1995.
 
  Stewart H. Yonts. Mr. Yonts was employed by Tenneco, Inc. from 1976 to 1980,
last serving as Tax Counsel. Mr. Yonts was Tax Manager of Home Petroleum
Corporation from 1980 to 1982 and Director of Taxes of MCO Resources, Inc., a
natural resources company, from 1982 to 1986. He joined the Company as Tax
Manager in August 1986 and served as Manager of Taxes and Benefits Accounting
from November 1989 until he became the Treasurer on October 1, 1994.
 
                                      75
<PAGE>
 
  J. Virgil Waggoner. Mr. Waggoner has served as President of the Company
since 1986. From 1950 to 1980 Mr. Waggoner was employed by Monsanto Company,
last serving as Group Vice President and Managing Director of Monsanto's
Plastics and Resins Company. Mr. Waggoner was President of El Paso Products
Company (now a subsidiary of Rexene Corporation), a commodity chemicals and
plastics company, from 1980 to 1983 and was a self-employed industry
consultant from 1983 to 1986. Mr. Waggoner has been on the Boards of Directors
of Kirby Corporation and Mail-Well, Inc. since July 1993 and February 1994,
respectively.
 
  Frank J. Hevrdejs. Mr. Hevrdejs is a principal and President of TSG, which
he co-founded in 1982. Mr. Hevrdejs has actively participated in acquisitions
of over 40 businesses in the past 15 years. He is Chairman of First Sterling
Ventures Corp., an investment company, Enduro Holdings, Inc., a structural and
electrical manufacturing company, and Fibreglass Holdings, Inc., a truck
accessory manufacturer. He is also a board member of Mail-Well, Inc., an
envelope manufacturer and commercial printer, Purina Mills, Inc., an animal
feed producer, and Eagle U.S.A., an air-freight company.
 
  Hunter Nelson. Mr. Nelson is currently a principal with TSG. Prior to
joining TSG in 1989, he served as vice president of administration and general
counsel of Fiber Industries, Inc., a producer of polyester fibers. Mr. Nelson
was previously a partner in the law firm of Andrews & Kurth L.L.P.
specializing in general corporate and securities law. Mr. Nelson serves on the
board of Sterling Diagnostic Imaging, Inc. and several other private
companies.
   
  In addition to the above named directors, the following individuals are
expected to become directors as a result of significant purchases of STX
Acquisition Common Stock in the Equity Private Placement by entities with
which they are affiliated.     
   
  George B. Gregory. Age 33. Mr. Gregory is a Managing Director in the Koch
Equities group of Koch Industries, Inc. where he is responsible for leading
the chemical investment and acquisitions effort. Prior to joining Koch
Equities, Mr. Gregory worked as a consultant for Monitor Company and as a
chemist for E.I. duPont de Nemours & Company.     
   
  Robert B. Calhoun. Age 53. Mr. Calhoun has been President of Clipper Asset
Management Corporation, the sole general partner of The Clipper Group, L.P., a
private investment firm, since 1991, and of Clipper Capital Corporation, the
sole general partner of Clipper Capital Partners, L.P., an affiliated private
investment firm, since 1993. From 1975 to 1991, Mr. Calhoun was a Managing
Director of CS First Boston Corporation. Mr. Calhoun is also a director of
HighwayMaster Communications, Inc., Avondale Incorporated and Interstate
Bakeries Corporation.     
                         
                      CERTAIN FINANCIAL PROJECTIONS     
   
  The Company does not, as a matter of course, publicly disclose projections
as to future revenues, earnings or other financial information. Certain
projections (the "Projections") were prepared by management of the Company and
furnished to its directors, the Special Committee and to Lazard in the course
of the Special Committee's examination of the Company's strategic
alternatives. The Projections were used by Lazard in connection with its
evaluation of the Merger and other proposals and alternatives considered by
the Special Committee. The Projections are not included in this Proxy
Statement to induce any stockholder to vote for the authorization and adoption
of the Merger Agreement or to influence any stockholder with respect to the
Rollover Election. None of the Company, or any of its financial advisors or
any of their respective directors or officers, assumes any responsibility as a
result of their inclusion in this Proxy Statement for the accuracy of the
Projections. The Projections were based upon a variety of assumptions,
including those set forth below. Such assumptions involve judgments with
respect to, among other things, future economic, competitive and regulatory
conditions, financial market conditions and future business decisions, all of
which are difficult or impossible to predict accurately and many of which are
beyond the control of the Company. While the Company believes that the
assumptions underlying the Projections were reasonable when made, the
Projections include fiscal 1996     
 
                                      76
<PAGE>
 
   
results that are not reasonably achievable under current circumstances. The
commodity chemicals industry in which the Company operates is cyclical and
volatile in nature and the Company's operating leverage can result in small
changes in pricing or costs having a material effect on profitability; any
projections must accordingly be deemed inherently unreliable. Accordingly, it
is expected that there will be differences between actual and projected
results, and actual results may be materially higher or lower than projected
results.     
   
  The Projections below were not prepared with a view to public disclosure or
compliance with published guidelines of the SEC, nor were they prepared in
accordance with the guidelines established by the American Institute of
Certified Public Accountants for preparation and presentation of financial
projections. In addition, the Projections do not purport to present operations
in accordance with generally accepted accounting principles and have not been
audited, compiled or otherwise examined by Arthur Andersen LLP ("Arthur
Andersen"), the Company's independent accountants, or by any other independent
accountants. Accordingly, neither Arthur Andersen nor any other independent
accountants assume responsibility for the Projections presented below.     
 
                                       77
<PAGE>
 
   
  Set forth below is certain projected consolidated income statement
information for the years ending September 30, 1996 through September 30, 2000
and certain projected consolidated balance sheet information as of September
30, for each year in the period 1996 through 2000. The Projections for the
years ending September 30, 1996 through September 30, 1998 were prepared by
management of the Company. The Projections for the years ending September 30,
1999 and September 30, 2000 were prepared by Lazard and reviewed by management
of the Company. The expected case and downside case Projections, as utilized
by the Special Committee for these periods, are presented below. In view of
expectations regarding worldwide capacity additions and market conditions as
they existed at the time, the Special Committee, management of the Company and
Lazard believed that the expected case and downside case Projections
adequately bounded the Company's expected range of performance. Therefore, no
upside case projections were considered by the Special Committee. The
significant assumptions underlying the Projections are described in the notes
following the Projections. The Projections were prepared several months ago
and must be reviewed in light of the Company's more recent financial
performance. In addition, the Projections do not take into account the
consummation of the Merger (including the Financing).     
   
  AS A GENERAL MATTER, THE PROJECTIONS ARE FORWARD LOOKING STATEMENTS AND
ACTUAL RESULTS COULD DIFFER MATERIALLY AS A RESULT OF ANY OR ALL OF THE
FACTORS AFFECTING THE COMPANY'S BUSINESS THAT HAVE BEEN IDENTIFIED ELSEWHERE
IN THIS PROXY STATEMENT OR IN THE DOCUMENTS INCORPORATED BY REFERENCE HEREIN.
       
  THE PROJECTIONS SET FORTH BELOW ARE INCLUDED SOLELY BECAUSE SUCH PROJECTIONS
WERE CONSIDERED BY THE SPECIAL COMMITTEE IN THE COURSE OF THE SPECIAL
COMMITTEE'S EVALUATION OF THE COMPANY'S STRATEGIC ALTERNATIVES. THE
PROJECTIONS FOR THE FISCAL YEARS 1996, 1997 AND 1998 WERE DEVELOPED, HOWEVER,
DURING FISCAL 1995 IN CONNECTION WITH THE COMPANY'S INTERNAL THREE-YEAR PLAN
AND, TOGETHER WITH THE PROJECTIONS FOR FISCAL 1999 AND 2000, WERE SUBSEQUENTLY
REVISED DURING THE AUCTION PROCESS. SINCE THAT TIME, MARKET CONDITIONS FOR
STYRENE AND ACRYLONITRILE HAVE WEAKENED, AND SUCH WEAKNESS HAS BEEN REFLECTED
IN THE COMPANY'S RECENT RESULTS. THE PROJECTIONS REFLECTED FISCAL 1996 EBITDA
OF $187.9 MILLION, BUT ACTUAL EBITDA FOR THE SIX MONTHS ENDED MARCH 31, 1996
WAS ONLY $63.5 MILLION. ACCORDINGLY, THE FISCAL 1996 EBITDA REFLECTED IN THE
PROJECTIONS IS NOT REASONABLY ATTAINABLE GIVEN RECENT OPERATING RESULTS.
READERS ARE STRONGLY CAUTIONED THAT THE PROJECTIONS SHOULD NOT BE RELIED UPON
AS A CURRENT ESTIMATE BY MANAGEMENT OF PROJECTED OPERATING RESULTS.     
 

                                      78
<PAGE>
 
                              
                           COMPANY EXPECTED CASE     
 
<TABLE>   
<CAPTION>
                                           PROJECTED
                            -------------------------------------------
                             1996     1997     1998     1999     2000
                            -------  -------  -------  -------  -------
                             (DOLLARS IN MILLIONS EXCEPT PER SHARE
                                             DATE)
<S>                         <C>      <C>      <C>      <C>      <C>
Petrochemicals EBITDA.....  $ 126.1  $ 122.3   $ 76.3   $117.7   $133.1
Pulp chemicals EBITDA.....     61.8     85.8    104.4    102.9     94.7
                            -------  -------  -------  -------  -------
Operating EBITDA..........    187.9    208.1    180.6    220.7    227.8
Cost savings..............      --       --       --       --       --
Total EBITDA..............    187.9    208.1    180.6    220.7    227.8
Less depreciation.........    (39.1)   (52.8)   (55.1)   (55.1)   (55.1)
                            -------  -------  -------  -------  -------
  EBIT....................    148.8    155.3    125.6    165.6    172.7
SAR's & other income......     (2.7)    (2.5)    (1.2)    (1.2)    (1.2)
Interest income (expense).    (10.2)    (3.6)    10.7     27.9     47.5
                            -------  -------  -------  -------  -------
  Pretax income...........    135.9    149.3    135.1    192.3    219.0
Income taxes..............    (47.6)   (52.2)   (47.3)   (67.3)   (76.7)
                            -------  -------  -------  -------  -------
  Net income..............  $  88.3  $  97.0  $  87.8   $125.0   $142.4
                            -------  -------  -------  -------  -------
  E.P.S...................  $  1.59  $  1.74  $  1.58  $  2.24  $  2.56
  Shares outstanding......     55.7     55.7     55.7     55.7     55.7
                            -------  -------  -------  -------  -------
Plus: deferred taxes......  $  10.2  $  12.3  $   8.1  $   7.2  $   6.7
Plus: depreciation &
 amortization.............     39.1     52.8     55.1     55.1     55.1
Less: change in working
 capital..................    (29.7)    (3.2)    18.0     (1.5)     0.4
Less: capital
 expenditures.............   (104.2)   (47.5)   (31.5)   (25.0)   (25.0)
                            -------  -------  -------  -------  -------
  Free cash flow..........  $   3.7   $111.4   $137.5   $160.8   $179.5
                            =======  =======  =======  =======  =======
Cash & investments........  $   0.0    $24.6   $162.1   $322.9   $502.4
                            -------  -------  -------  -------  -------
Total debt................  $  86.8  $   0.0  $   0.0  $   0.0  $   0.0
Net debt..................  $  86.8  $ (24.6) $(162.1) $(322.9) $(502.4)
Stockholders' equity......  $ 327.6  $ 424.6  $ 512.5  $ 637.5  $ 779.8
</TABLE>    
            
         See accompanying notes to Certain Financial Projections.     
 
                                       79
<PAGE>
 
                              
                           COMPANY DOWNSIDE CASE     
 
<TABLE>   
<CAPTION>
                                                    PROJECTED
                                       ----------------------------------------
                                        1996    1997    1998    1999     2000
                                       ------  ------  ------  -------  -------
                                         (DOLLARS IN MILLIONS EXCEPT PER
                                                   SHARE DATA)
<S>                                    <C>     <C>     <C>     <C>      <C>
Petrochemicals EBITDA................. $101.1  $ 71.2  $ 41.8  $  79.9  $  94.9
Pulp chemicals EBITDA.................   61.8    72.0    78.4     90.0     82.5
                                       ------  ------  ------  -------  -------
Operating EBITDA......................  162.9   143.2   120.2    170.0    177.4
Cost savings..........................     --      --      --       --       --
Total EBITDA..........................  162.9   143.2   120.2    170.0    177.4
Less: depreciation....................  (39.1)  (52.1)  (53.4)   (53.4)   (53.4)
                                       ------  ------  ------  -------  -------
  EBIT................................  123.8    91.1    66.8    116.5    123.9
SAR's & other income..................   (2.7)   (2.5)   (1.2)    (1.2)    (1.2)
Interest income (expense).............  (11.2)   (7.2)    3.3     15.7     30.2
                                       ------  ------  ------  -------  -------
  Pretax income.......................  109.9    81.4    68.8    131.1    153.0
Income taxes..........................  (38.5)  (28.5)  (24.1)   (45.9)   (53.5)
                                       ------  ------  ------  -------  -------
  Net income.......................... $ 71.4  $ 52.9  $ 44.7  $  85.2  $  99.4
                                       ------  ------  ------  -------  -------
  E.P.S............................... $ 1.28  $ 0.95  $ 0.80  $  1.53  $  1.79
  Shares outstanding..................   55.7    55.7    55.7     55.7     55.7
                                       ------  ------  ------  -------  -------
Plus: deferred taxes.................. $ 10.2  $ 12.3  $  8.1  $   7.2  $   6.7
Plus: depreciation & amortization.....   39.1    52.1    53.4     53.4     53.4
Less: change in working capital.......  (29.7)   (3.2)   18.0     (3.4)     0.4
Less: capital expenditures............ (104.2)  (31.7)  (25.0)   (25.0)   (25.0)
                                       ------  ------  ------  -------  -------
  Free cash flow...................... $(13.2) $ 82.4  $ 99.3  $ 177.4  $ 135.0
                                       ======  ======  ======  =======  =======
Cash & investments.................... $  0.0  $  0.0  $ 78.0  $ 195.4  $ 330.5
                                       ------  ------  ------  -------  -------
Total debt............................ $103.7  $ 21.3  $  0.0  $   0.0  $   0.0
Net debt.............................. $103.7  $ 21.3  $(78.0) $(195.4) $(330.5)
Stockholders' equity.................. $310.7  $363.6  $408.4  $ 493.6  $ 593.0
</TABLE>    
            
         See accompanying notes to Certain Financial Projections.     
 
                                       80
<PAGE>
 
   
NOTES TO CERTAIN FINANCIAL PROJECTIONS     
   
Assumptions used in formulating the Projections included the following:     
   
I. General     
     
  (a) Petrochemical business will generally be moving down in the business
      cycle.     
     
  (b) Pulp chemicals will be moving into a period of strong growth in demand
      and margins.     
     
  (c) Strong financial capital structure in all cases with debt capacity
      available and cash buildup available for growth or other shareholder
      wealth options.     
     
  (d) Significant investment in growth and modernization of all plant
      facilities.     
       
    (1)Methanol Plant -- 150M gallons.     
       
    (2)Acetic Plant -- two expansion to 1.0 billion lbs.     
       
    (3)Plasticizers Expansion -- 10% capacity increase.     
       
    (4)Styrene -- expanded capacity to 1.7 billion lbs.     
       
    (5)Valdosta Chlorate Plant -- 110,000 short tons.     
   
II. Expected Case     
     
  (a) Markets     
      
   (1)Petrochemicals     
       
    (i)Slow to moderate growth in U.S. and global economy during forecast
          period.     
       
    (ii) Current Far East disruption in supply/demand balance in styrene is
         temporary and styrene shows gradual improvement during first
         quarter of fiscal 1996 with good supply/demand balance through
         third quarter of fiscal 1996 and then trailing off during fourth
         quarter. Sharp drop in demand and margins for styrene in 1997 and
         1998 as a result of new worldwide capacity.     
       
    (iii) Acrylonitrile demand will continue to support strong margins in
          fiscal 1996 and 1997 with a drop off in demand and margins to
          historical levels in 1998.     
      
   (2)Pulp Chemicals     
       
    (i) Strong growth rate for sodium chlorate through 1998, with Valdosta
        plant on-stream in the first quarter of fiscal 1997.     
      
   (3)Sales Volumes     
       
    (i) Styrene 1450 Mlbs Average Annual Volume (90% of Capacity 1996, 80%
        - 85% of Capacity 1997 - 1998).     
                        
                     Export Volumes 50%     
                        
                     Domestic Volumes 50%     
       
    (ii)Acrylonitrile 674 Mlbs Average Annual Volume (91% of Capacity)     
                        
                     Export Volumes 55%     
                        
                     Domestic Volumes 45%     
      
   (4)Capital Projects     
                                  
                     Methanol Plant         FY 1996     $ 26 million     
                     Acetic Expansion       FY 1996     $  3 million     

                     Valdosta Chlorate Plant     
                                                           
                                            FY 1997     $ 54 million     
                        
                     Total Capital Expenditures     
                                                           
                                            1996-98     $183 million     
 
                                      81
<PAGE>
 
   
III. Downside Case     
     
  (a) Markets     
      
   (1)Petrochemicals     
       
    (i) Weak growth rates in U.S. and global markets during forecast
        period.     
       
    (ii) Extended demand/supply interruptions in Far East in styrene with
         modest improvement during second half of 1996. Margins continue to
         decline in fiscal 1997 and 1998 as a result of new worldwide
         capacity.     
       
    (iii) All fiber markets weaken during forecast period with
          acrylonitrile margins near historical pre-1995 level during
          forecast period.     
      
   (2)Pulp Chemicals     
       
    (i) Slower growth rate for sodium chlorate during forecast period with
        Valdosta plant on-stream in fiscal 1997.     
      
   (3)Sales Volumes     
       
    (i) Styrene 1450 Mlbs Average Annual Volume (90% of Capacity 1996, 80%
        - 85% of Capacity 1997, 1998)     
                        
                     Export Volumes 50%     
                        
                     Domestic Volumes 50%     
          
    (ii) Acrylonitrile 632 Mlbs Average Annual Volume (85% of Capacity)
             
                        
                     Export Volumes 51%     
                        
                     Domestic Volumes 49%     
      
   (4)Capital Projects     
                            
                     Methanol Plant         FY 1996     $ 26 million     
                     Acetic Expansion       FY 1996     $  3 million     
                        
                     Valdosta Chlorate Plant     
                                               
                                            FY 1997     
                                                           
                                                        $ 54 million     
                        
                     Total Capital Expenditures     
                                                           
                                            1996-98     $161 million     
 
                                      82
<PAGE>
 
                        INDEPENDENT PUBLIC ACCOUNTANTS
 
  Coopers & Lybrand L.L.P. ("Coopers & Lybrand"), independent auditors,
audited and reported on the consolidated financial statements of the Company
and its subsidiaries for its fiscal year ended September 30, 1995. Such
financial statements have been incorporated by reference in this Proxy
Statement in reliance upon such report.
 
  On October 25, 1995, the Audit Committee of the Board of Directors of the
Company recommended and the Board of Directors of the Company approved the
engagement of the firm of Arthur Andersen LLP ("Arthur Andersen") as its
independent auditors for the year ending September 30, 1996, to replace the
firm of Coopers & Lybrand. The termination by the Company of the engagement of
Coopers & Lybrand was effective upon the completion of the audit for the year
ended September 30, 1995, and the filing of the Company's Annual Report on
Form 10-K for such year. The appointment of Arthur Andersen as the Company's
independent auditors for the fiscal year ending September 30, 1996 was
ratified by the stockholders at the 1996 Annual Meeting of Stockholders.
   
  During the two most recent fiscal years and the subsequent period through
December 18, 1995, the date of filing of the Company's Annual Report on Form
10-K, there were no disagreements with Coopers & Lybrand on any matter of
accounting principles or practices, financial statement disclosure, or audit
scope or procedures, which disagreements, if not resolved to their
satisfaction, would have caused them to make reference in connection with
their report to the subject matter of the disagreement.     
   
  During the two most recent fiscal years and the subsequent period through
December 18, 1995, the date of filing of the Company's Annual Report on Form
10-K, the Company has not been advised by Coopers & Lybrand of any of the
reportable events listed in Item 304(a)(1)(v)(A) through (D) of SEC Regulation
S-K and during such period the Company has not consulted with Arthur Andersen
regarding any matter referenced under Item 304(a)(2) of SEC Regulation S-K.
    
  The audit reports of Coopers & Lybrand on the consolidated financial
statements of the Company as of and for the fiscal years ended September 30,
1995 and 1994, did not contain any adverse opinion or disclaimer of opinion,
nor were they qualified or modified as to uncertainty, audit scope, or
accounting principles, except for an explanatory paragraph noting that the
Company changed its method of accounting for income taxes effective October 1,
1993.
 
  Representatives of Arthur Andersen and Coopers & Lybrand are expected to be
present at the Special Meeting, will be given an opportunity to make a
statement, if they desire to do so, and will be available to respond to
appropriate questions.
 
                               FEES AND EXPENSES
 
  The Merger Agreement provides that TSG and STX Acquisition, on the one hand,
and the Company, on the other hand, will bear their respective expenses
incurred in connection with the contemplated sale of the Company, except in
certain circumstances specified in the Merger Agreement relating to the
termination thereof. See "THE MERGER--Terms of the Merger--Fees and Expenses."
The estimated expenses incurred and to be incurred by the Company, TSG and STX
Acquisition in connection with the Merger and the related transactions are as
follows:
 
<TABLE>
     <S>                                                            <C>
     Advisory, investment banking and commercial banking fees(1)...  36,500,000
     Filing fees...................................................     300,000
     Legal fees(2).................................................   2,200,000
     Printing and mailing fees.....................................     400,000
     Accounting fees...............................................     600,000
                                                                    -----------
     Total......................................................... $40,000,000
                                                                    ===========
</TABLE>
 
                                      83
<PAGE>
 
- --------
(1) Includes an aggregate $12.0 million fee payable to TSG and Unicorn.
(2) Includes the fees and estimated expenses of counsel to the Board and the
    Special Committee (see "SPECIAL FACTORS--Background") and counsel to TSG
    and STX Acquisition. Does not include fees and disbursements in connection
    with the litigation described in "THE MERGER--Certain Litigation" or any
    other litigation that may relate to the Merger.
 
                            ADDITIONAL INFORMATION
 
  The Company, TSG and STX Acquisition have filed a Schedule 13E-3 with the
SEC with respect to the Merger. As permitted by the rules and regulations
under the Exchange Act, this Proxy Statement omits certain information
contained in the Schedule 13E-3. The Company is subject to the informational
requirements of the Exchange Act and in accordance therewith files periodic
reports, proxy statements and other information with the SEC. The Schedule
13E-3 and the respective exhibits thereto, as well as such reports, proxy
statements and other information, may be inspected and copied at the SEC's
offices, without charge, or copies thereof may be obtained from the SEC upon
payment of prescribed rates. Copies of the Schedule 13E-3 may also be obtained
without charge by calling the Company's Secretary at (713) 650-3700.
Statements contained in this Proxy Statement concerning documents filed with
the SEC as exhibits to the Schedule 13E-3 or included with this Proxy
Statement as annexes are necessarily incomplete and are, in each instance,
qualified by reference to such exhibit or annex.
 
                          INCORPORATION BY REFERENCE
 
  The following documents filed by the Company with the SEC are incorporated
herein by reference:
 
  1. Annual Report on Form 10-K for the fiscal year ended September 30, 1995,
     as amended by Form 10-K/A dated April 5, 1996.
 
  2. Quarterly Reports on Form 10-Q for the quarters ended December 31, 1995
     and March 31, 1996.
   
  3. Current Reports on Form 8-K dated December 18, 1995, April 26, 1996 (as
     amended June 14, 1996), and June 25, 1996 (as amended June 27, 1996).
         
  All documents subsequently filed by the Company pursuant to Sections 13(a),
13(c), or 14 or 15(d) of the Exchange Act after the date of this Proxy
Statement and prior to the date of the Special Meeting shall be deemed
incorporated by reference into this Proxy Statement and to be a part hereof
from the date of filing of such documents. Any statement contained in a
document incorporated or deemed to be incorporated by reference herein shall
be deemed to be modified or superseded for purposes of this Proxy Statement to
the extent that a statement contained herein, or in any subsequently filed
document which also is or is deemed to be incorporated by reference herein,
modifies or supersedes such statement. Any statement so modified or superseded
shall not be deemed, except as so modified or superseded, to constitute a part
of this Proxy Statement.
 
  A copy of the documents incorporated herein by reference (without exhibits,
unless such exhibits are specifically incorporated by reference into the
information incorporated by reference herein) that are not delivered herewith
will be provided, without charge, to each person, including each beneficial
owner, to whom a copy of this Proxy Statement is delivered, upon written or
oral request of such person and by first class mail or other equally prompt
means within one business day of receipt of request. Requests should be
directed to Sterling Chemicals, Inc., 1200 Smith Street, Suite 1900, Houston,
Texas 77002-4312., attention: Office of the Secretary, telephone number (713)
650-3700.
 
                                      84
<PAGE>
 
                                 OTHER MATTERS
 
  The Board of Directors of the Company does not intend to bring any other
matters before the Special Meeting and does not know of any other matters that
may be brought before the Special Meeting by others. If any other matter
should come before the Special Meeting, the persons named in the enclosed
proxy will have discretionary authority to vote the shares of Common Stock
thereby represented in accordance with their best judgment.
 
  The Surviving Corporation will hold its 1997 Annual Meeting of Stockholders
in accordance with the Surviving Corporation's amended Bylaws and the DGCL.
Stockholder proposals intended to be presented at the 1997 Annual Meeting of
Stockholders must have been received by the Surviving Corporation at its
principal executive offices not later than August 23, 1996 for inclusion in
the proxy materials for the 1997 Annual Meeting.
 
                                      85
<PAGE>
 
                                    ANNEX A
               AMENDED AND RESTATED AGREEMENT AND PLAN OF MERGER
 
  This Amended and Restated Agreement and Plan of Merger, dated as of April
24, 1996 and amended as of June 11, 1996, is between STX Acquisition Corp., a
Delaware corporation ("Newco"), and Sterling Chemicals, Inc., a Delaware
corporation (the "Company").
 
  Whereas, the Board of Directors of Newco has approved the merger (the
"Merger") of Newco with and into the Company in accordance with the General
Corporation Law of the State of Delaware (the "DGCL") upon the terms and
subject to the conditions set forth herein;
 
  Whereas, the Board of Directors of the Company has (i) approved this
Agreement and the transactions contemplated hereby, (ii) determined that the
consideration to be paid for the outstanding shares of the Company's common
stock, par value $.01 per share, (the "Company Common Stock") in the Merger is
fair to and in the best interests of the stockholders of the Company and (iii)
resolved to recommend to the stockholders of the Company that they vote in
favor of adoption of this Agreement;
 
  Whereas, in order to induce Newco to enter into this Agreement, certain
stockholders of the Company are, contemporaneously with the execution and
delivery of this Agreement, executing and delivering to Newco an Agreement and
Irrevocable Proxy evidencing their agreement to vote their shares of Company
Common Stock in favor of the Merger;
 
  Whereas, in order to ensure that sufficient cash will be available to
convert all shares of Company Common Stock that the holders thereof desire to
have converted into cash, certain stockholders of the Company, at the request
of and as an accommodation to the Company are, contemporaneously with the
execution and delivery of this Agreement, executing and delivering to the
Company an Inducement Agreement (the "Inducement Agreement") evidencing their
agreement to make Rollover Elections (as defined below) with respect to all or
a portion of the shares of Company Common Stock held by such stockholders; and
 
  Whereas, the Board of Directors of the Company has unanimously approved the
execution and delivery of each Agreement and Irrevocable Proxy referred to
above and the Inducement Agreement and the transactions contemplated thereby,
respectively.
 
  Now, Therefore, in consideration of the foregoing and the mutual covenants
and agreements herein contained, and intending to be legally bound hereby,
Newco and the Company hereby agree as follows:
 
                                   ARTICLE I
 
                        DEFINITIONS AND INTERPRETATION
 
  Section 1.01. Certain Defined Terms. Capitalized terms used in this
Agreement shall have the following respective meanings, except as otherwise
provided herein or as the context shall otherwise require:
 
    "Acquisition Transaction" has the meaning specified in Section 6.02(a).
 
    "Agreement" means this Amended and Restated Agreement and Plan of Merger.
 
    "Benefit Plan" has the meaning specified in Section 4.09A(a).
 
    "Business Day" means any day on which commercial banks are not authorized
  or required to close in New York, New York.
 
    "Canadian Plans" has the meaning specified in Section 4.09B(a).
 
    "CERCLA" has the meaning specified in the definition of Environmental
  Laws.
 
    "Certificate of Merger" has the meaning specified in Section 2.03(a).
 
 
                                      A-1
<PAGE>
 
    "Claim" means any claim, demand, investigation, cause of action, suit,
  default, assessment, litigation, third party action, arbitral proceeding or
  proceeding by or before any Governmental Authority or any other Person.
 
    "Closing" has the meaning specified in Section 2.02.
 
    "Closing Date" has the meaning specified in Section 2.02.
 
    "Code" means the Internal Revenue Code of 1986, and any successor statute
  of similar import, together with the regulations thereunder.
 
    "Commonly Controlled Entity" has the meaning specified in Section
  4.09A(c).
 
    "Company" has the meaning specified in the introductory paragraph of this
  Agreement.
 
    "Company Certificates" means certificates that immediately prior to the
  Effective Time represented outstanding shares of Company Common Stock.
 
    "Company Common Stock" has the meaning specified in the recitals of this
  Agreement.
 
    "Company Disclosure Schedule" has the meaning specified in the
  introductory sentence of Article IV.
 
    "Company Financial Statements" has the meaning specified in Section 4.05.
 
    "Company Permits" has the meaning specified in Section 4.13(a).
 
    "Company Required SEC Filings" means any and all forms, reports,
  schedules, registration statements and other documents required to be filed
  by the Company with the SEC in connection with the transactions
  contemplated by this Agreement.
 
    "Company Required Statutory Approvals" means the following insofar as
  they relate to the consummation by the Company of the transactions
  contemplated by this Agreement: (i) the filings, permits, authorizations,
  consents and approvals required under the Securities Act, the Exchange Act
  (including the filing of the Company Required SEC Filings and the Proxy
  Statement with the SEC) and any State securities Laws (ii) the orders,
  filings, permits, notices, authorizations, consents and approvals required
  under the Competition Act, the Investment Canada Act and any securities
  Laws of any Province or territory of Canada, (iii) the filings required by
  the HSR Act, (iv) the filing of the Certificate of Merger with the
  Secretary of State of the State of Delaware and (v) any required filings
  with or approvals from applicable state environmental authorities, public
  service commissions and public utility commissions.
 
    "Company SEC Documents" has the meaning specified in Section 4.05.
 
    "Company Stockholder Approval" has the meaning specified in Section 4.26.
 
    "Competition Act" means the Competition Act (Canada) R.S.C. 1985c.34.
 
    "Confidentiality Agreement" has the meaning specified in Section 7.02(b).
 
    "Contract" means any agreement, lease, license, evidence of indebtedness,
  mortgage, deed of trust, note, bond, indenture, security agreement,
  commitment, instrument, understanding or other contract, obligation or
  arrangement of any kind.
 
    "Definitive Bank Loan Documents" has the meaning specified in Section
  7.07(c).
 
    "Definitive Equity Documents" has the meaning specified in Section
  7.07(d).
 
    "DGCL" has the meaning specified in the recitals of this Agreement.
 
                                      A-2
<PAGE>
 
    "Dissenting Shares" has the meaning specified in Section 3.01(d).
 
    "Effective Time" has the meaning specified in Section 2.03(b).
 
    "Electing Shares" has the meaning specified in Section 3.01(c)(i).
 
    "Election Date" has the meaning specified in Section 3.02(a).
 
    "Environmental Law" means any Law relating to the use, storage,
  treatment, sale, transportation, processing, handling, labeling,
  production, manufacture, release or disposal of Hazardous Substances,
  including, without limitation, (i) any common law that may impose liability
  or obligations for injuries or damages due to the presence of or exposure
  to any Hazardous Substance, (ii) the Comprehensive Environmental Response,
  Compensation and Liability Act of 1980, 42 U.S.C. (S) 9601 et seq., as
  amended by the Superfund Amendment and Reauthorization Act of 1986
  ("CERCLA"), (iii) the Federal Water Pollution Control Act, 33 U.S.C.
  (S) 1251 et seq., (iv) the Solid Waste Disposal Act of 1976, 42 U.S.C.
  (S) 6901 et seq., (v) the Clean Air Act, 42 U.S.C. (S) 7401 et seq., (vi)
  the Toxic Substances Control Act, 15 U.S.C. (S) 2601 et seq., (vii) the
  Hazardous Materials Transportation Act, 49 Ap. U.S.C.A. (S) 1801 et seq.,
  (viii) the Federal Insecticide, Fungicide and Rodenticide Act, 7 U.S.C.
  (S) 136 et seq., and (ix) comparable state and local Laws.
 
    "Environmental Permits" means any permit required or issued under any
  Environmental Law.
 
    "Equity Plans" means the Omnibus Stock Plan and all other contracts,
  commitments, plans, programs or arrangements providing for the issuance or
  grant of any Stock Acquisition Rights or any capital stock (restricted or
  otherwise), stock appreciation rights, phantom stock or other equity
  interests in the Company or any Subsidiary, including stock purchase plans.
 
    "ERISA" means the Employee Retirement Income Security Act of 1974 and any
  successor statute of similar import, together with the regulations
  thereunder, in each case as in effect from time to time. References to
  sections of ERISA shall be construed to also refer to any successor
  sections.
 
    "Exchange Act" means the Securities Exchange Act of 1934 and the rules
  and regulations promulgated thereunder.
 
    "Exchange Agent" has the meaning specified in Section 3.02(b).
 
    "Exchange Fund" has the meaning specified in Section 3.04(e).
 
    "Financing" has the meaning specified in Section 7.07(a)(i).
 
    "Financing Letters" has the meaning specified in Section 7.07(a)(i).
 
    "Form of Election" has the meaning specified in Section 3.02(c).
 
    "GAAP" means (i) when used with respect to any Subsidiary which is
  organized under the Laws of Canada or any Province thereof, generally
  accepted Canadian accounting principles, applied on a consistent basis
  (except for changes made due to the implementation of new or revised
  standards issued by the Canadian Institute of Chartered Accountants), and
  which are applicable in the circumstances as of the date in question, and
  (ii) in all other cases, generally accepted United States accounting
  principles, applied on a consistent basis (except for changes made due to
  the implementation of new or revised standards issued by the Financial
  Accounting Standards Board), and which are applicable in the circumstances
  as of the date in question. Accounting principles are applied on a
  "consistent basis" when the accounting principles observed in a current
  period are comparable in all material respects to those accounting
  principles applied in a preceding period.
 
    "Governmental Approval" means any authorization, consent, approval,
  license, franchise, lease, ruling, tariff, rate, permit, certificate or
  exemption of, or filing or registration with, any Governmental Authority.
 
                                      A-3
<PAGE>
 
    "Governmental Authority" means (i) any nation or government, (ii) any
  federal, state, county, province, city, town, municipality, local or other
  political subdivision thereof or thereto, (iii) any court, tribunal,
  department, commission, board, bureau, instrumentality, agency, council,
  arbitrator or other entity exercising executive, legislative, judicial,
  regulatory or administrative functions of or pertaining to government and
  (iv) any other governmental entity, agency or authority having or
  exercising jurisdiction over any relevant Person, item or matter.
 
    "Hazardous Substance" means any substance, whether liquid, solid or gas,
  listed, defined, designated or classified as hazardous, toxic, radioactive
  or dangerous, defined in or under any applicable Environmental Law, whether
  by type or by quantity. Hazardous Substance includes, without limitation,
  (i) any "hazardous substance" as defined in CERCLA and (ii) any "hazardous
  waste" as defined in the Resource Conservation and Recovery Act.
 
    "HSR Act" means the Hart-Scott-Rodino Antitrust Improvements Act of 1976,
  15 U.S.C. (S) 18a.
 
    "Hysop Agreement" means that certain Stock Bonus Agreement dated as of
  August 28, 1995 between Gary Hysop and Sterling Pulp Chemicals, Ltd., a
  corporation incorporated under the Laws of Ontario, Canada and a wholly-
  owned indirect subsidiary of the Company.
 
    "Indemnified Parties" has the meaning specified in Section 7.09(a).
 
    "Inducement Agreement" has the meaning specified in the recitals of this
  Agreement.
 
    "Intellectual Property" has the meaning specified in Section 4.19(b).
 
    "Investment Canada Act" means the Investment Canada Act R.S.C. 1985c.28.
 
    "IRS" means the Internal Revenue Service.
 
    "Laws" means (i) all laws, statutes, rules, requirements, awards,
  regulations, ordinances, orders, writs, injunctions, decisions,
  determinations, directives or decrees and other pronouncements having the
  effect of law and (ii) all contracts or agreements with any Governmental
  Authority relating to compliance with the matters described in clause (i)
  above.
 
    "Lazard" has the meaning specified in Section 4.17.
 
    "Liability" means, with respect to any Person, any indebtedness,
  obligation and other liability of such Person, whether absolute, accrued,
  contingent, fixed or otherwise, or whether due or to become due, including
  liabilities for Taxes, material forward or long-term commitments, or
  unrealized or anticipated Losses from any unfavorable Contracts or
  commitments.
 
    "Lien" means (i) any lien, charge, mortgage, pledge, hypothecation,
  assignment, security interest, assessment, levy or encumbrance of any kind
  or nature whatsoever (whether voluntary or involuntary, affirmative or
  negative, and whether imposed or created by Contract, operation of Law or
  otherwise) in, on, of or with respect to any properties or assets of the
  applicable Person, whether now owned or hereafter acquired, (ii) any
  Contract to give any of the foregoing and (iii) any conditional sale or
  other title retention agreement and any financing lease having
  substantially the same effect as any of the foregoing.
 
    "Losses" means any and all damages (including consequential, punitive and
  exemplary), fines, penalties, judgments, deficiencies, losses, costs and
  expenses, including court costs, reasonable fees of attorneys, accountants
  and other experts and other reasonable expenses of any Claim.
 
    "Mandatory Rollover Shares" has the meaning specified in Section 3.03(a).
 
    "Material Adverse Effect" means a material adverse effect on (i) the
  business, operations, assets, condition (financial or otherwise) or results
  of operations of the Company and the Subsidiaries taken as a whole, (ii)
  the prospects of the Company and the Subsidiaries taken as a whole
  (excluding any effect on such prospects caused by economic, tax or other
  matters of general applicability or matters generally
 
                                      A-4
<PAGE>
 
  affecting any of the industries in which the Company or any of the
  Subsidiaries conducts business), (iii) the Company's ability to comply with
  or satisfy in any material respect any material covenant, condition or
  agreement to be complied with or satisfied by it under this Agreement or
  (iv) the Company's ability to consummate the Merger by the Outside Date.
 
    "Maximum Amount" has the meaning specified in Section 7.06(c).
 
    "Maximum Rollover Number" has the meaning specified in Section 3.03.
 
    "Merger" has the meaning specified in the recitals of this Agreement.
 
    "Merger Consideration" has the meaning specified in Section 3.01(c).
 
    "Newco" has the meaning specified in the introductory paragraph of this
  Agreement.
 
    "Newco Common Stock" has the meaning specified in Section 3.01(a).
 
    "Newco Disclosure Schedule" has the meaning specified in the introductory
  sentence of Article V.
 
    "Newco Required Statutory Approvals" means the following insofar as they
  relate to the consummation by Newco of the transactions contemplated by
  this Agreement: (i) the filings, permits, authorizations, consents and
  approvals required under the Securities Act, the Exchange Act (including
  the filing of the Newco SEC Filings with the SEC) and any State securities
  Laws (ii) the orders, filings, permits, notices, authorizations, consents
  and approvals required under the Competition Act, the Investment Canada Act
  and any securities Laws of any Province or territory of Canada, (iii) the
  filings required by the HSR Act, (iv) the filing of the Certificate of
  Merger with the Secretary of State of the State of Delaware and (v) any
  required filings with or approvals from applicable state environmental
  authorities, public service commissions and public utility commissions.
 
    "Newco SEC Filings" means any and all forms, reports, schedules,
  registration statements and other documents filed by Newco with the SEC in
  connection with the transactions contemplated by this Agreement.
 
    "Newco Stockholder Approval" has the meaning specified in Section 5.08.
 
    "Omnibus Stock Plan" has the meaning specified in Section 4.02(c).
 
    "Operating Sub" has the meaning specified in Section 7.12.
 
    "Operating Sub SEC Filings" means any and all forms, reports, schedules,
  registration statements and other documents filed by Operating Sub with the
  SEC in connection with the transactions contemplated by this Agreement.
 
    "Outside Date" means October 31, 1996 or such subsequent date as the
  Parties may mutually agree upon in writing.
 
    "Parties" means the Company and Newco.
 
    "PBGC" means the Pension Benefit Guaranty Corporation or any successor
  thereto.
 
    "Pension Plan" has the meaning specified in Section 4.09A(a).
 
    "Person" means any individual, firm, corporation, trust, association,
  company, limited liability company, joint stock company, partnership, joint
  venture, Governmental Authority or other entity or enterprise.
 
    "Phantom Stock Amount" has the meaning specified in Section 7.06(b).
 
    "Potential Acquiror" has the meaning specified in Section 6.02(a).
 
    "Proxy Statement" means the proxy statement (or proxy statement and
  prospectus, as the case may be) to be distributed in connection with the
  Stockholders Meeting.
 
                                      A-5
<PAGE>
 
    "Registration Statements" means the Company Required SEC Filings, if any,
  that constitute registration statements filed with the SEC pursuant to the
  Securities Act and the Newco SEC Filings and the Operating Sub SEC Filings
  that constitute registration statements filed with the SEC pursuant to the
  Securities Act.
 
    "Restricted Stock" has the meaning specified in Section 7.06(d).
 
    "Rollover Election" has the meaning specified in Section 3.02(a).
 
    "Rollover Proration Factor" has the meaning specified in Section 3.03(b).
 
    "Rollover Share" has the meaning specified in Section 3.01(c)(i).
 
    "SAR" has the meaning specified in Section 7.06(b).
 
    "SEC" means the Securities and Exchange Commission of the United States
  or any successor thereof.
 
    "Securities Act" means the Securities Act of 1933 and the rules and
  regulations promulgated thereunder.
 
    "Spread Amount" has the meaning specified in Section 7.06(b).
 
    "Stock Acquisition Rights" means (i) all options, warrants, calls,
  subscriptions or other rights of any nature to acquire any shares of
  capital stock of, or any other equity interests in, the Company or any
  Subsidiary and (ii) all securities convertible into or exchangeable for
  such shares or equity interests or obligating the Company or any Subsidiary
  to grant, extend or enter into any such option, warrant, call, subscription
  or other right, agreement or commitment; provided, however, that the term
  "Stock Acquisition Rights" shall not include SARs, phantom stock and
  restricted stock grants.
 
    "Stockholders Meeting" has the meaning specified in Section 7.01(a).
 
    "Subsidiary" means (i) any corporation, partnership, joint venture,
  limited liability company or other entity of which at least a majority of
  the outstanding voting stock of which is owned by the Company, directly or
  indirectly, and (ii) any corporation, partnership, joint venture, limited
  liability company or other entity in which the Company, directly or
  indirectly, owns more than a 50% equity interest. As used above, "voting
  stock" means, in the case of any entity, stock or other voting interests
  having ordinary voting power, in the absence of contingencies, to elect a
  majority of the board of directors or any similar governing body of such
  entity or, if there are no such directors or similar governing body, having
  a majority of the general voting power with respect to the policies and
  activities of such entity.
 
    "Surviving Corporation" has the meaning specified in Section 2.01.
 
    "Surviving Corporation Common Stock" means the common stock, par value
  $0.01 per share, of the Surviving Corporation.
 
    "Takeover Proposal" has the meaning specified in Section 6.02(a).
 
    "Taxes" means any and all taxes, assessments, imposts, deductions,
  charges, withholdings, Claims and levies assessed or imposed by any
  Governmental Authority and all Liabilities with respect thereto, including
  any sales, use, occupation, transfer, stock transfer, real property
  transfer, export, recording, gains, stamp, documentary, income, windfall
  profits, franchise, license, excise, payroll, social security, withholding,
  service, service use and property taxes, charges and similar levies and
  fees.
 
    "Welfare Plan" has the meaning specified in Section 4.09A(a).
 
  Section 1.02. Interpretation. In this Agreement, unless a clear contrary
intention appears:
 
    (a) the words "hereof," "herein" and "hereunder" and words of similar
  import refer to this Agreement as a whole and not to any particular
  provision of this Agreement;
 
    (b) reference to any gender includes each other gender and the neuter;
 
                                      A-6
<PAGE>
 
    (c) all terms defined in the singular shall have the same meanings in the
  plural and vice versa;
 
    (d) reference to any Person includes such Person's heirs, executors,
  personal representatives, administrators, successors and assigns; provided,
  however, that nothing contained in this clause (d) is intended to authorize
  any assignment not otherwise permitted by this Agreement;
 
    (e) reference to a Person in a particular capacity or capacities excludes
  such Person in any other capacity;
 
    (f) reference to any Contract means such Contract as amended,
  supplemented or modified from time to time in accordance with the terms
  thereof;
 
    (g) all references to Articles, Sections and Exhibits shall be deemed to
  be references to the Articles and Sections of this Agreement and the
  Exhibits attached hereto which are made a part hereof and incorporated
  herein by reference;
 
    (h) the word "including" (and with correlative meaning "include") means
  including, without limiting the generality of any description preceding
  such term;
 
    (i) with respect to the determination of any period of time, the word
  "from" means "from and including" and the words "to" and "until" each means
  "to but excluding";
 
    (j) the captions and headings contained in this Agreement shall not be
  considered or given any effect in construing the provisions hereof if any
  question of intent should arise;
 
    (k) reference to any Law or any Governmental Approval means such Law or
  Governmental Approval as amended, modified, codified, reenacted,
  supplemented or superseded in whole or in part, and in effect from time to
  time;
 
    (l) accounting terms used but not defined herein shall be construed in
  accordance with GAAP, and whenever the character or amount of any asset,
  Liability or item of income or expense is required to be determined, or any
  consolidation or accounting computation is required to be made, such
  determination or computation shall be made in accordance with GAAP;
 
    (m) all computations and calculations to be made hereunder in accordance
  with GAAP shall be made by utilizing such allocations, conventions and
  methods as are consistent with GAAP and have been utilized by the Company
  prior to the date hereof or which may be subsequently adopted by the
  Company in accordance with GAAP except as otherwise provided herein;
 
    (n) the word "knowledge", when used in any representation, covenant or
  warranty of the Company contained herein, means the actual knowledge of any
  officer, director, plant manager or business unit manager of, or other
  person performing similar functions for, the Company or any of the
  Subsidiaries and, when used in any representation, covenant or warranty of
  Newco contained herein, means the actual knowledge of any officer, director
  or employee of Newco;
 
    (o) where any provision of this Agreement refers to action to be taken by
  any Person, or which such Person is prohibited from taking, such provision
  shall be applicable whether such action is taken directly or indirectly by
  such Person; and
 
    (p) no provision of this Agreement shall be interpreted or construed
  against either Party solely because that Party or its legal representative
  drafted such provision.
 
                                      A-7
<PAGE>
 
                                  ARTICLE II
 
                                  THE MERGER
 
  Section 2.01. The Merger. Upon the terms and subject to the conditions set
forth in this Agreement and in accordance with the DGCL, Newco shall be merged
with and into the Company at the Effective Time. Following the Effective Time,
the separate corporate existence of Newco shall cease and the Company shall
continue as the surviving corporation (the "Surviving Corporation") and shall
succeed to and assume all the rights and obligations of Newco in accordance
with the DGCL.
 
  Section 2.02. Closing. The closing of the Merger (the "Closing") will take
place at 10:00 a.m. (local time) on the second Business Day after satisfaction
or waiver of the conditions set forth in Article VIII at the offices of
Andrews & Kurth L.L.P., 600 Travis, 4200 Texas Commerce Tower, Houston, Texas
77002, unless another time, date or place is agreed to in writing by the
Parties. The date on which the Closing occurs is referred to in this Agreement
as the "Closing Date".
 
  Section 2.03. Effective Time. (a) Subject to the provisions of this
Agreement, as soon as practicable on or after the Closing Date, the Parties
shall file a certificate of merger (the "Certificate of Merger") with the
Secretary of State of the State of Delaware, in a form mutually acceptable to
the Parties, executed in accordance with the relevant provisions of the DGCL.
 
  (b) The Merger shall become effective at such time as the Certificate of
Merger is duly filed with the Secretary of State of the State of Delaware
unless a subsequent time shall be specified in the Certificate of Merger, in
which case the Merger shall become effective at such subsequent time. The time
the Merger becomes effective is referred to in this Agreement as the
"Effective Time".
 
  Section 2.04. Effects of the Merger. The Merger shall have the effects set
forth in Section 259 of the DGCL.
 
  Section 2.05. Certificate of Incorporation and By-Laws. (a) At the Effective
Time, the Restated Certificate of Incorporation of the Company, as in effect
on the date thereof, shall be amended to read in its entirety as set forth in
Exhibit B and, as so amended, shall be the certificate of incorporation of the
Surviving Corporation after the Effective Time until thereafter changed or
amended as provided therein or by the DGCL.
 
  (b) The By-laws of the Company, as in effect immediately prior to the
Effective Time, shall be the By-laws of the Surviving Corporation until
thereafter changed or amended as provided therein or by the DGCL.
 
  Section 2.06. Directors. The directors of Newco immediately prior to the
Effective Time shall be the directors of the Surviving Corporation and shall
serve until the earlier of their resignation or removal or until their
respective successors are duly elected and qualified, as the case may be.
 
  Section 2.07. Officers. The officers of Newco immediately prior to the
Effective Time shall be the officers of the Surviving Corporation and shall
serve until the earlier of their resignation or removal or until their
respective successors are duly elected and qualified, as the case may be.
 
                                  ARTICLE III
 
               EFFECT OF THE MERGER ON THE CAPITAL STOCK OF THE
              CONSTITUENT CORPORATIONS; EXCHANGE OF CERTIFICATES
 
  Section 3.01. Effect on Capital Stock. As of the Effective Time, by virtue
of the Merger and without any action on the part of the Company, Newco, any
holder of capital stock of the Company or any holder of capital stock of
Newco, the following events shall occur:
 
    (a) Common Stock of Newco. Each share of common stock, par value $0.01
  per share, of Newco ("Newco Common Stock") issued and outstanding
  immediately prior to the Effective Time shall be automatically converted
  into that number of fully paid and nonassessable shares of Surviving
  Corporation
 
                                      A-8
<PAGE>
 
  Common Stock equal to the quotient obtained by dividing (i) 10,890,834
  minus the aggregate number of whole Rollover Shares by (ii) the aggregate
  number of issued and outstanding shares of Newco Common Stock immediately
  prior to the Effective Time.
 
    (b) Cancellation of Treasury Stock and Newco-Owned Company Common Stock.
  Each share of Company Common Stock that is owned by the Company, any
  wholly-owned Subsidiary or Newco shall be automatically canceled and
  retired and shall cease to exist, and no cash, Surviving Corporation Common
  Stock or other consideration shall be delivered or deliverable in exchange
  therefor.
 
    (c) Conversion (or Retention) of Company Common Stock. Except as
  otherwise provided herein and subject to Sections 3.01(d), 3.03 and
  3.04(c):
 
      (i) the holder of each share of Company Common Stock issued and
    outstanding immediately prior to the Effective Time with respect to
    which an election to retain Surviving Corporation Common Stock has been
    effectively made and not revoked or lost pursuant to Section 3.02
    ("Electing Shares"), shall have the right to retain one fully paid and
    nonassessable share of Surviving Corporation Common Stock (a "Rollover
    Share") which shall remain outstanding and, except as expressly
    provided herein, unaffected by the Merger; and
 
      (ii) each share of Company Common Stock issued and outstanding
    immediately prior to the Effective Time (other than Electing Shares),
    shall be automatically converted into the right to receive $12.00 in
    cash from the Surviving Corporation following the Merger.
 
  As used herein, "Merger Consideration" means, in the case of each share of
  Company Common Stock issued and outstanding immediately prior to the
  Effective Time (other than shares of Company Common Stock referred to in
  Section 3.01(b)), the consideration described with respect to such share in
  clause (i) or (ii) above, as applicable.
 
    (d) Shares of Dissenting Stockholders. Notwithstanding anything in this
  Agreement to the contrary, shares of Company Common Stock that are issued
  and outstanding immediately prior to the Effective Time and are held by
  stockholders who have (i) not voted such shares in favor of the adoption of
  this Agreement and (ii) properly demanded appraisal of such shares in
  accordance with Section 262 of the DGCL (the "Dissenting Shares") shall not
  be retained or converted as described in Section 3.01(c) but shall become
  the right to receive such consideration as may be determined to be due to
  such stockholders pursuant to Section 262 of the DGCL. If, after the
  Effective Time, any such stockholder withdraws his demand for appraisal or
  fails to perfect or otherwise loses his right of appraisal, in any case
  pursuant to the DGCL, his Dissenting Shares shall be deemed to be converted
  as of the Effective Time into the right to receive the Merger Consideration
  (without any interest thereon) as provided in Section 3.01(c)(ii). Promptly
  upon receiving any demands for appraisal, withdrawals of demands for
  appraisal or any other instrument served pursuant to Section 262 of the
  DGCL, the Company shall so notify Newco and shall give Newco the
  opportunity to participate in and direct all negotiations and proceedings
  with respect to any such appraisal demands. The Company shall not, without
  the prior written consent of Newco, make any payment with respect to, or
  settle, offer to settle or otherwise negotiate, any such appraisal demands.
  In no event shall any holder of Company Common Stock have any appraisal
  rights except to the extent provided in Section 262 of the DGCL.
 
    (e) Cancellation and Retirement of Company Common Stock. (i) As of the
  Effective Time, all shares of Company Common Stock (other than Dissenting
  Shares and shares referred to in Section 3.01(b) and Electing Shares
  retained as Rollover Shares), issued and outstanding immediately prior to
  the Effective Time shall no longer be outstanding and shall be
  automatically canceled and retired and shall cease to exist, and each
  holder of a Company Certificate shall, to the extent such Company
  Certificate immediately prior to the Effective Time represented such
  shares, cease to have any rights with respect thereto, except the right to
  receive cash (without interest) in accordance with Sections 3.01(c)(ii) and
  3.04.
 
                                      A-9
<PAGE>
 
    (ii) All cash paid upon the surrender for exchange of Company
  Certificates in accordance with this Article III (including cash paid in
  lieu of fractional shares of Surviving Corporation Common Stock) shall be
  deemed to have been paid in full satisfaction of all rights pertaining to
  the shares of Company Common Stock exchanged for cash theretofore
  represented by such Company Certificates.
 
    (f) Withholding Tax. The right of any stockholder to receive the Merger
  Consideration as provided in Section 3.01(c)(ii), 3.03(d) or 3.04(c) shall
  be subject to and reduced by the amount of any required withholding
  obligation for Taxes.
 
  Section 3.02. Company Common Stock Elections. (a) Each Person who, on or
prior to the Business Day next preceding the Stockholders Meeting (the
"Election Date"), is a record holder of shares of Company Common Stock will be
entitled, with respect to all or any portion of his shares, to make an
unconditional election (a "Rollover Election") on or prior to the Election
Date to retain Electing Shares as Rollover Shares, on the basis hereinafter
set forth. All shares of Company Common Stock with respect to which the holder
thereof does not make a Rollover Election on or before the Election Date in
accordance with the provisions of this Section 3.02 shall be converted, as of
the Effective Time, into the right to receive the Merger Consideration
described in Section 3.01(c)(ii).
 
  (b) Prior to the mailing of the Proxy Statement, Newco shall appoint a bank
or trust company reasonably acceptable to the Company to act as exchange agent
(together with such other agent or agents as may be hereafter appointed by
Newco for this purpose, the "Exchange Agent") for the delivery and/or payment
of the Merger Consideration.
 
  (c) The Company shall prepare and mail a form of election, which form shall
be subject to the reasonable approval of Newco (the "Form of Election"), with
the Proxy Statement to the record holders of Company Common Stock as of the
record date for the Stockholders Meeting, which Form of Election shall be used
by each record holder of shares of Company Common Stock who wishes to make a
Rollover Election. The Company will use its reasonable best efforts to make
the Form of Election and the Proxy Statement available to all Persons who
become holders of Company Common Stock during the period between such record
date and the Election Date. Any Rollover Election shall have been properly
made only if the Exchange Agent shall have received at its designated office
by 5:00 p.m., New York time, on the Election Date, a Form of Election properly
completed and signed and accompanied by Company Certificates for the shares of
Company Common Stock to which such Form of Election relates, duly endorsed in
blank or otherwise in form acceptable for transfer on the books of the Company
(or by an appropriate guarantee of delivery of such certificates as set forth
in such Form of Election from a firm which is a member of a registered
national securities exchange or of the National Association of Securities
Dealers, Inc. or a commercial bank or trust company having an office or
correspondent in the United States; provided, however, that such Company
Certificates are in fact delivered to the Exchange Agent within three trading
days on the New York Stock Exchange after the date of execution of such
guarantee of delivery).
 
  (d) Any Form of Election may be revoked by the stockholder submitting it to
the Exchange Agent only by written notice received by the Exchange Agent (i)
prior to 5:00 p.m., New York time, on the Election Date or (ii) after the
Election Date, if (and only to the extent that) the Exchange Agent is legally
required to permit revocations and the Effective Time shall not have occurred
prior to such date. In addition, all Forms of Election shall automatically be
revoked if the Exchange Agent is notified in writing by the Parties that the
Merger Agreement has been terminated. If a Form of Election is revoked as
aforesaid, the Company Certificate or Certificates (or guarantee of delivery,
as appropriate) for the shares of Company Common Stock to which such Form of
Election relates shall be promptly returned by the Exchange Agent to the
stockholder submitting the same.
 
  (e) The determination of the Exchange Agent shall be binding as to whether
or not Rollover Elections have been properly made or revoked pursuant to this
Section 3.02 with respect to shares of Company Common Stock and when elections
and revocations were received by the Exchange Agent. If the Exchange Agent
determines that any Rollover Election was not properly made with respect to
shares of Company Common Stock, such
 
                                     A-10
<PAGE>
 
shares shall be treated by the Exchange Agent as shares which are not Electing
Shares, and such shares shall be exchanged in the Merger for cash pursuant to
Section 3.01(c)(ii) and Section 3.04(b). The Exchange Agent shall also make
all computations as to the allocation and the proration contemplated by
Section 3.03, and any such computation shall be conclusive and binding on the
holders of shares of Company Common Stock. The Exchange Agent may, with the
consent of the Parties (which shall not be unreasonably withheld), make such
rules as are consistent with this Section 3.02 for the implementation of the
elections provided for herein as the Exchange Agent shall deem necessary or
desirable fully to effect such elections.
 
  Section 3.03. Proration. Notwithstanding anything in this Agreement to the
contrary, the aggregate number of shares of Company Common Stock to be
retained as Rollover Shares pursuant to Section 3.01(c)(i) shall not exceed
5,000,000 (the "Maximum Rollover Number"). If the number of Electing Shares
exceeds the Maximum Rollover Number, then each Electing Share shall be
retained as Rollover Shares or converted into the right to receive cash in
accordance with Section 3.01(c) in the following manner:
 
    (a) each stockholder that committed to make a Rollover Election with
  respect to 100% of the shares of Company Common Stock held by such
  stockholder pursuant to the terms of the Inducement Agreement shall have
  the right to retain all of such shares as Rollover Shares (collectively,
  the "Mandatory Rollover Shares");
 
    (b) a proration factor (the "Rollover Proration Factor") shall be
  determined by dividing (i) the Maximum Rollover Number minus the aggregate
  number of Mandatory Rollover Shares by (ii) the total number of Electing
  Shares minus the aggregate number of Mandatory Rollover Shares;
 
    (c) the number of Electing Shares covered by each Rollover Election
  (other than Rollover Elections with respect to Mandatory Rollover Shares)
  which the holder making such Rollover Election shall have the right to
  retain as Rollover Shares shall be determined by multiplying the Rollover
  Proration Factor by the total number of Electing Shares (other than
  Mandatory Rollover Shares) covered by such Rollover Election; and
 
    (d) all Electing Shares, other than those shares which the holder thereof
  has the right to retain as Rollover Shares in accordance with clauses (a)
  and (c) above, shall be converted into the right to receive cash (as if
  such shares were not Electing Shares) in accordance with Section
  3.01(c)(ii).
 
If the number of Electing Shares is less than the Maximum Rollover Number,
then each holder of Electing Shares shall have the right to retain all of such
Electing Shares as Rollover Shares in accordance with Section 3.01(c)(i).
 
  Section 3.04. Exchange of Certificates. (a) Exchange Fund. At or prior to
the Effective Time, Newco shall, or shall cause the Surviving Corporation to,
make available to the Exchange Agent funds sufficient for the payment of the
Merger Consideration payable pursuant to Section 3.01(c)(ii) upon surrender of
Company Certificates by the Company's stockholders as described in Sections
3.02(c) and 3.04(b), it being understood that any and all interest earned on
funds made available to the Exchange Agent pursuant to this Agreement shall be
for the account of, and shall remain the property of, Newco.
 
  (b) Exchange Procedures. (i) As soon as practicable after the Effective
Time, each holder of an outstanding Company Certificate or Certificates shall,
upon surrender to the Exchange Agent of such Company Certificate or
Certificates and acceptance thereof by the Exchange Agent as described below
and in Section 3.02(c), be entitled to receive a certificate or certificates
representing the number of full Rollover Shares, if any, which the holder of
such shares of Company Common Stock has the right to retain pursuant to this
Agreement and the amount of cash, if any, into which the number of shares
(including fractional shares) of Company Common Stock previously represented
by such Company Certificate or Certificates surrendered shall have been
converted pursuant to this Agreement. The Exchange Agent shall accept such
Company Certificates upon compliance with such reasonable terms and conditions
as the Exchange Agent may impose to effect an orderly exchange thereof in
accordance with normal exchange practices.
 
  (ii) If delivery or payment of the Merger Consideration is to be made or
paid to a Person other than the Person in whose name a surrendered Company
Certificate is registered, it shall be a condition of such delivery
 
                                     A-11
<PAGE>
 
or payment that the Company Certificate so surrendered shall be properly
endorsed, with signature guaranteed or otherwise in proper form for transfer
and that the Person requesting such delivery or payment shall have paid to the
Company or its transfer agent any transfer or other Taxes required by reason
of such delivery or payment to a Person other than the registered holder of
the Company Certificate surrendered or shall have established to the
satisfaction of the Company or its transfer agent that such Taxes either have
been paid or are not payable.
 
  (iii) Until surrendered and exchanged in accordance with this Section
3.04(b), each Company Certificate (other than Company Certificates
representing Dissenting Shares) shall be deemed at any time after the
Effective Time to represent only the right to receive upon such surrender and
exchange the Merger Consideration as provided for in this Article III, without
any interest thereon.
 
  (c) No Fractional Shares. (i) No certificates or scrip representing
fractional Rollover Shares shall be issued in connection with the Merger, and
such fractional share interests will not entitle the owner thereof to vote or
to any rights of a stockholder of the Surviving Corporation.
 
  (ii) Notwithstanding any other provision of this Agreement, each holder of
shares of Company Common Stock who would otherwise have been entitled to
retain a fraction of a Rollover Share (after taking into account all shares of
Company Common Stock delivered by such holder) shall be entitled to receive
from the Exchange Agent, in lieu thereof, a cash payment (without interest)
equal to such fraction multiplied by $12.00.
 
  (d) Distributions with Respect to the Unexchanged Shares. No dividends or
other distributions with a record date after the Effective Time shall be paid
with respect to Rollover Shares to the holder of any Company Certificate for
corresponding Electing Shares and no cash payment in lieu of fractional shares
shall be paid to any such holder pursuant to Section 3.04(c) until the
surrender and exchange of such Company Certificate in accordance with this
Article III. Subject to the effect of applicable Laws, following surrender and
exchange of any such Company Certificate, there shall be paid to the holder of
the certificate representing whole Rollover Shares issued in connection
therewith, without interest, (i) as soon as practicable after the later of the
Effective Time or such surrender and exchange, the amount of any cash payable
in lieu of a fractional Rollover Share to which such holder is entitled
pursuant to Section 3.04(c) and the proportionate amount of dividends or other
distributions with a record date after the Effective Time theretofore paid
with respect to such whole Rollover Shares and (ii) at the appropriate payment
date, the proportionate amount of dividends or other distributions with a
record date after the Effective Time but prior to such surrender and exchange
and a payment date subsequent to such surrender and exchange payable with
respect to such whole Rollover Shares.
 
  (e) Termination of Exchange Fund. Any portion of the Merger Consideration
deposited with the Exchange Agent pursuant to this Section 3.04 (the "Exchange
Fund") which remains undistributed to the holders of the Company Certificates
for six months after the Effective Time shall be delivered to the Surviving
Corporation, upon demand, and any holders of shares of Company Common Stock
prior to the Merger who have not theretofore complied with this Article III
shall thereafter look only to the Surviving Corporation and only as general
creditors thereof for payment of their claim for cash (if any), Rollover
Shares (if any), any cash in lieu of fractional Rollover Shares and any
dividends or distributions with respect to whole Rollover Shares to which such
holders may be entitled.
 
  (f) No Liability. Neither Party nor the Exchange Agent shall be liable to
any Person in respect of any Rollover Shares (or dividends or distributions
with respect thereto) or cash from the Exchange Fund delivered to a public
official pursuant to any applicable abandoned property, escheat or similar
Law. If any Company Certificate shall not have been surrendered prior to one
year after the Effective Time (or immediately prior to such earlier date on
which any cash, if any, any cash in lieu of fractional Rollover Shares or any
dividends or distributions with respect to Rollover Shares in respect of such
Company Certificate would otherwise escheat to or become the property of any
Governmental Authority), any such cash, dividends or distributions in respect
of such Company Certificate shall, to the extent permitted by applicable Law,
become the property of the Surviving Corporation, free and clear of all Claims
or interests of any Person previously entitled thereto.
 
                                     A-12
<PAGE>
 
  (g) Investment of Exchange Fund. The Exchange Agent shall invest any cash
included in the Exchange Fund, as directed by the Surviving Corporation. Any
interest and other income resulting from such investments shall be paid to the
Surviving Corporation.
 
  Section 3.05. Closing of the Company's Transfer Books. After the date on
which the Effective Time occurs, there shall be no further transfer on the
books of the Company or its transfer agent of Company Certificates and if
Company Certificates are presented to the Surviving Corporation for transfer,
they shall be canceled and exchanged for the Merger Consideration in
accordance with this Article III.
 
  Section 3.06. Relative Rights and Privileges of Shares. The Rollover Shares
and the shares of Surviving Corporation Common Stock issued in exchange for
shares of Newco Common Stock will constitute shares of the same class.
Accordingly, after the Effective Time, the holder of each Rollover Share and
the holder of each share of Surviving Corporation Common Stock issued in
exchange for shares of Newco Common Stock shall be entitled to the same
relative rights and privileges under the DGCL and the Certificate of
Incorporation or Bylaws of the Surviving Corporation.
 
                                  ARTICLE IV
 
                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY
 
  Except as otherwise set forth on the disclosure schedule heretofore
delivered by the Company to Newco which makes reference to this Agreement (the
"Company Disclosure Schedule"), the Company represents and warrants to Newco
as follows:
 
  Section 4.01. Organization. (a) The Company is a corporation duly organized,
validly existing and in good standing under the laws of the State of Delaware
and has all requisite corporate power and corporate authority and all
necessary Governmental Approvals to own, lease and operate its properties and
to carry on its business as now being conducted, except where the failure to
have such Governmental Approvals would not, when taken together with all such
other failures, have a Material Adverse Effect. Each Subsidiary is a
corporation duly organized, validly existing and in good standing under the
laws of the jurisdiction of its incorporation and has all requisite corporate
power and corporate authority and all necessary Governmental Approvals to own,
lease and operate its properties and to carry on its business as now being
conducted, except where the failure to have such Governmental Approvals would
not, when taken together with all such other failures, have a Material Adverse
Effect.
 
  (b) The Company and each Subsidiary is duly qualified or licensed to do
business and is in good standing in each jurisdiction in which the properties
owned, leased or operated by it or the nature of the business conducted by it
makes such qualification or licensing necessary, except where the failure to
be so duly qualified or licensed and in good standing would not, when taken
together with all other such failures, have a Material Adverse Effect.
 
  (c) The Company has made available to Newco complete and correct copies of
the Certificate of Incorporation and By-laws and other comparable
organizational documents of the Company and each Subsidiary, in each case as
amended to the date of this Agreement. The respective Certificates of
Incorporation and By-laws or such other organizational documents of the
Subsidiaries do not contain any provision limiting or otherwise restricting
the ability of the Company to control the Subsidiaries.
 
  (d) The Company Disclosure Schedule contains an accurate and complete list
of all Subsidiaries. All the outstanding shares of capital stock of each
Subsidiary are owned by the Company or by another wholly-owned Subsidiary,
free and clear of all Liens, and are duly authorized, validly issued, fully
paid, nonassessable and free of any preemptive rights in respect thereto.
 
  Section 4.02. Capitalization. (a) The authorized capital stock of the
Company consists of (i) 150,000,000 shares of Company Common Stock, of which
55,689,991 shares are issued and outstanding on the date hereof
 
                                     A-13
<PAGE>
 
and 4,636,863 shares are issued and held in treasury on the date hereof and
(ii) 25,000,000 shares of preferred stock, par value $1.00 per share, none of
which is issued and outstanding or held in treasury on the date hereof. All of
the outstanding shares of Company Common Stock are duly authorized, validly
issued, fully paid and nonassessable and free of any preemptive rights in
respect thereto.
 
  (b) The authorized and issued and outstanding capital stock of each
Subsidiary is as described in the Company Disclosure Schedule. All of such
outstanding shares are duly authorized, validly issued, fully paid and
nonassessable and are free of any preemptive rights in respect thereto.
 
  (c) The Company has heretofore furnished to Newco a complete and correct
copy of the Company's Omnibus Stock and Incentive Plan ("Omnibus Stock Plan")
and the Hysop Agreement. As of the date hereof, there are no unexercised Stock
Acquisition Rights outstanding except for options issued under the Omnibus
Stock Plan to acquire an aggregate of 82,500 shares of Company Common Stock,
none of which are immediately exercisable, and the rights of Gary Hysop to
receive "Bonus Shares" under the Hysop Agreement.
 
  (d) Except as set forth in this Section 4.02, as of the date hereof, (i) no
shares of capital stock or other voting securities of the Company are
outstanding, (ii) no equity equivalents, interests in the ownership of the
Company or other similar rights are outstanding and (iii) there are no
existing Equity Plans or Stock Acquisition Rights. As of the date hereof,
there are no outstanding contractual obligations of the Company or any
Subsidiary to repurchase, redeem or otherwise acquire any shares of capital
stock or other securities of the Company or any Subsidiary.
 
  Section 4.03. Authority. (a) The Company has the requisite corporate power
and authority to execute and deliver this Agreement and, subject to the
Company Stockholder Approval and the Company Required Statutory Approvals, to
consummate the transactions contemplated hereby. Upon obtaining the Company
Stockholder Approval, the execution, delivery and performance of this
Agreement and the consummation of the transactions contemplated hereby will
have been duly authorized by all necessary corporate action on the part of the
Company and no other corporate proceedings on the part of the Company will be
necessary to authorize this Agreement or to consummate such transactions. No
vote of the Company's stockholders is required to approve this Agreement or
the other transactions contemplated hereby except for the Company Stockholder
Approval.
 
  (b) This Agreement has been duly executed and delivered by the Company and,
assuming this Agreement constitutes a valid and binding obligation of Newco,
constitutes a valid and binding obligation of the Company enforceable against
the Company in accordance with its terms, except that (i) such enforcement may
be subject to bankruptcy, insolvency, moratorium or similar Laws affecting
creditors' rights and (ii) the remedy of specific performance and injunctive
and other forms of equitable relief are subject to certain equitable defenses
and to the discretion of the court before which any proceedings therefor may
be brought. Without limitation of the foregoing, each of the covenants and
obligations of the Company set forth in Articles VI, VII and X is valid,
binding and enforceable as aforesaid notwithstanding the absence of the
Company Stockholder Approval.
 
  Section 4.04. Consents and Approvals; No Violations. (a) The execution and
delivery of this Agreement by the Company do not violate, conflict with or
result in any breach of any provision of, or constitute a default (or an event
which, with notice or lapse of time or both, would constitute a default)
under, or result in the termination of, or accelerate the performance required
by, or result in a right of termination or acceleration under, or give rise to
any obligation to make payments or provide compensation under, or result in
the creation of any Lien upon any of the properties of the Company or any
Subsidiary, under any of the terms, conditions or provisions of (i) the
Certificate of Incorporation or By-laws of the Company or of the equivalent
organizational documents of any Subsidiary, (ii) any Law, permit or license
applicable to the Company or any of its properties or to any Subsidiary or any
of its properties or (iii) any Contract to which the Company or any of the
Subsidiaries is now a party or by which the Company or any of the Subsidiaries
or any of their respective properties may be bound or affected. Neither the
performance of this Agreement by the Company nor the consummation by the
Company of the transactions contemplated hereby will result in any violation,
conflict, breach, default, termination, acceleration of performance or
creation of any Liens, or give rise to any right in any third party or cause
any such right to become exercisable, under any of the terms, conditions or
provisions described in clauses (i) through
 
                                     A-14
<PAGE>
 
(iii) above. Excluded from the foregoing sentences of this paragraph (a),
insofar as they apply to the terms, conditions or provisions described in
clauses (ii) and (iii) of the first sentence of this paragraph (a), are such
violations, conflicts, breaches, defaults, terminations, accelerations,
payments, compensations or creations of Liens that, individually or in the
aggregate, would not have a Material Adverse Effect.
 
  (b) Except for the Company Required Statutory Approvals, no Governmental
Approval is necessary for the execution and delivery of this Agreement by the
Company or the consummation by the Company of the transactions contemplated
hereby, other than Governmental Approvals which, if not made or obtained (as
the case may be), would not, individually or in the aggregate, have a Material
Adverse Effect.
 
  Section 4.05. SEC Reports and Financial Statements. The Company and each of
the Subsidiaries has filed with the SEC, and has heretofore made available to
Newco true and complete copies of, all forms, reports, schedules, statements
and other documents (including exhibits, amendments and supplements thereto)
required to be filed by it under the Exchange Act or the Securities Act since
September 30, 1994 (such forms, reports, schedules, statements and other
documents, to the extent filed and publicly available prior to the date of
this Agreement, other than preliminary filings, are referred to herein as the
"Company SEC Documents"). The Company SEC Documents, at the time filed (a) did
not contain any untrue statement of a material fact or omit to state a
material fact required to be stated therein or necessary in order to make the
statements therein, in light of the circumstances under which they were made,
not misleading, and (b) complied in all material respects with the applicable
requirements of the Exchange Act and the Securities Act, as the case may be.
The Company SEC Documents include all filings necessary to correct any Company
SEC Document which, subsequent to its time of filing, (i) contained any untrue
statement of a material fact or omitted to state a material fact required to
be stated therein or necessary in order to make the statements therein not
misleading, and (ii) no longer complied in all material respects with the
applicable requirements of the Exchange Act and the Securities Act, as the
case may be. The financial statements of the Company included in the Company
SEC Documents (the "Company Financial Statements") comply as to form in all
material respects with applicable accounting requirements and with the
published rules and regulations of the SEC with respect thereto, have been
prepared in accordance with GAAP applied on a consistent basis during the
periods involved (except as may be indicated in the notes thereto or, in the
case of the unaudited statements, as permitted by Form 10-Q of the SEC) and
fairly present (subject, in the case of the unaudited statements, to normal,
recurring audit adjustments) the consolidated financial position of the
Company and its consolidated Subsidiaries as at the dates thereof and the
consolidated results of their operations and cash flows for the periods then
ended.
 
  Section 4.06. Absence of Certain Changes or Events. Except as contemplated
by or otherwise described in this Agreement, during the period commencing on
September 30, 1995 and ending on the date hereof, the Company and the
Subsidiaries have conducted their respective businesses only in the ordinary
course, and there has not been:
 
    (a) any event or events having a Material Adverse Effect,
 
    (b) any declaration, setting aside or payment of any dividend or other
  distribution with respect to the capital stock (or any other equity
  interest) of the Company or any Subsidiary or any redemption, purchase or
  other acquisition of any of such capital stock (or any other equity
  interest),
 
    (c) any split, combination or reclassification of any capital stock (or
  any other equity interest) of the Company or any Subsidiary or any issuance
  or the authorization of any issuance of any other securities in respect of,
  in lieu of or in substitution for, shares of such capital stock (or other
  equity interest),
 
    (d) any granting by the Company or any of the Subsidiaries to any officer
  of the Company or any of the Subsidiaries of any increase in compensation,
  except in the ordinary course of business (including in connection with
  promotions) consistent with prior practice or as was required under
  employment agreements in effect as of September 30, 1995,
 
    (e) any granting by the Company or any of the Subsidiaries to any officer
  of the Company or any of the Subsidiaries of any increase in severance or
  termination pay, except as part of a standard employment
 
                                     A-15
<PAGE>
 
  package to any Person promoted or hired (but not including the five most
  senior officers), or as was required under employment, severance or
  termination agreements in effect as of September 30, 1995,
 
    (f) any entry by the Company or any of the Subsidiaries into any
  employment, severance or termination agreement with any officer of the
  Company or any of the Subsidiaries,
 
    (g) any increase in benefits available under or establishment of any
  Benefit Plan or Canadian Plan (including the granting of stock options,
  stock appreciation rights, performance awards or restricted stock awards or
  the amendment or acceleration of vesting of any existing stock options,
  stock appreciation rights, performance awards or restricted stock awards
  but excluding any amendment accelerating vesting of existing stock
  options), except in the ordinary course of business consistent with past
  practice,
 
    (h) (i) any damage, destruction or loss to physical properties owned or
  used by the Company or any of the Subsidiaries, whether or not covered by
  insurance, that has or reasonably could be expected to have a Material
  Adverse Effect, (ii) any reevaluation by the Company or any of the
  Subsidiaries of any of its material assets or (iii) any material change or
  commitment to make any material change in accounting methods, principles or
  practices by the Company or any Subsidiary,
 
    (i) any amendment or proposal to amend the Certificate of Incorporation
  or By-laws or comparable organizational documents of the Company or any
  Subsidiary,
 
    (j) any acquisition of or agreement to acquire (by merger, consolidation,
  acquisition of stock or assets or by any other manner) any business or any
  corporation, partnership, association or other business organization or
  division thereof by the Company or any Subsidiary or any investment or
  agreement to make any investment (by purchase of stock, contribution to
  capital, property transfer or purchase of property or otherwise) in any
  other Person by the Company or any Subsidiary,
 
    (k) any sale, lease, license, encumbrance or other disposition of, or
  agreement to sell, lease, license, encumber or otherwise dispose of, any
  material asset of the Company or any Subsidiary, except in the ordinary
  course of business consistent with prior practice,
 
    (l) any incurrence (which shall not be deemed to include entering into
  credit agreements, lines of credit or similar arrangements until borrowings
  are made under such arrangements) of any indebtedness for borrowed money
  (other than borrowings and reborrowings in the ordinary course of business
  under revolving credit facilities which were in existence prior to the date
  hereof) or guarantee of any such indebtedness or issuance or sale of any
  debt securities or warrants or rights to acquire any debt securities of the
  Company or any of the Subsidiaries or guarantee of any debt securities of
  others by the Company or any Subsidiary,
 
    (m) any tax election, or settlement or compromise of any income tax
  liability of the Company or any of its Subsidiaries, that has had or could
  reasonably be expected to have a Material Adverse Effect or that involved
  or calls for the payment by or to the Company or any Subsidiary of more
  than $1,500,000,
 
    (n) any payment, discharge, settlement or satisfaction of any Claims,
  Liabilities or Losses, other than the payment, discharge or satisfaction,
  in the ordinary course of business consistent with past practice or in
  accordance with their respective terms, of Liabilities recognized or
  disclosed in the most recent balance sheet (or the notes thereto) of the
  Company included in the Company Financial Statements or incurred since the
  date of such balance sheet in the ordinary course of business consistent
  with past practice, or any waiver of the benefits of, or agreement to
  modify in any manner, any confidentiality, standstill or similar agreement
  to which the Company or any of the Subsidiaries is a party,
 
    (o) any modification, amendment or termination of any material Contract
  to which the Company or any Subsidiary is a party or any waiver, release or
  assignment of any material rights or Claims of the Company or any
  Subsidiary, or
 
                                     A-16
<PAGE>
 
    (p) any capital expenditure or commitment to make capital expenditures by
  the Company or any Subsidiary in an amount which, when added to the
  aggregate amount of all other capital expenditures made or committed to be
  made by the Company and all the Subsidiaries since September 30, 1995,
  exceeds $10,000,000.
 
  Section 4.07. No Undisclosed Liabilities, etc. Except as set forth in the
Company Financial Statements, neither the Company nor any of the Subsidiaries
has any Liabilities of any nature that would be required by GAAP to be
reflected on a consolidated balance sheet of the Company and the Subsidiaries
(including the notes thereto), except for Liabilities incurred since September
30, 1995 that, individually or in the aggregate, have not had and could not
reasonably be expected to have a Material Adverse Effect. Except as set forth
in the Company SEC Documents, there does not exist any fact, circumstance,
condition or matter that has had a Material Adverse Effect or in the future
may (so far as the Company can now reasonably foresee) have a Material Adverse
Effect other than economic, tax or other matters of general applicability or
matters generally affecting any of the industries in which the Company or any
of the Subsidiaries conduct business.
 
  Section 4.08. Company Required SEC Filings. (a) None of the Company Required
SEC Filings, as of the date filed with or declared effective by the SEC or as
of the date mailed to the stockholders of the Company, the time of the
Stockholders Meeting or the Effective Time, will contain any untrue statement
of a material fact or omit to state any material fact required to be stated
therein or necessary in order to make the statements therein not misleading,
except that no representation or warranty is made by the Company with respect
to statements made or incorporated by reference therein based on information
supplied by Newco or Operating Sub specifically for inclusion or incorporation
by reference therein. Each of the Company Required SEC Filings will, as of
such specified dates and times, comply as to form in all material respects
with all applicable Laws, including the Securities Act and the Exchange Act.
 
  (b) None of the information provided by the Company or any Subsidiary
specifically for inclusion or incorporation by reference in any Newco SEC
Filing or any Operating Sub SEC Filing will, as of the date filed with or
declared effective by the SEC or at the Effective Time, contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein not
misleading.
 
  Section 4.09A. Employee Benefits. (a) Except as would not individually or in
the aggregate have a Material Adverse Effect: (i) each "employee pension
benefit plan" (as defined in Section 3(2) of ERISA) (a "Pension Plan") , each
"employee welfare benefit plan" (as defined in Section 3(1) of ERISA) (a
"Welfare Plan") and each other plan, arrangement or policy (written or oral)
relating to stock options, stock purchases, compensation, deferred
compensation, bonuses, severance, fringe benefits or other employee benefits,
in each case maintained or contributed to, or required to be maintained or
contributed to, by the Company or any of the Subsidiaries organized under the
Laws of any State of the United States for the benefit of any present or
former employee, officer or director of the Company or any such Subsidiary
(each of the foregoing, including the Pension Plans and the Welfare Plans, a
"Benefit Plan") has been administered in accordance with its terms and in
compliance with the applicable provisions of ERISA, the Code, all other
applicable Laws and all applicable collective bargaining agreements; (ii)
there has been no "prohibited transaction" (as defined in Section 406 of ERISA
or Section 4975 of the Code) with respect to any Benefit Plan; (iii) no
liability to the PBGC has been or is expected to be incurred with respect to
any Benefit Plan; (iv) no Pension Plan had an "accumulated funding deficiency"
(as defined in Section 302 of ERISA), whether or not waived, as of the last
day of the end of the most recent plan year ending prior to the date of this
Agreement; (v) the fair market value of the assets of each Pension Plan
exceeds the present value of the "benefit liabilities" (as defined in Section
4001(a)(16) of ERISA) under such Pension Plan as of the end of the most recent
plan year with respect to such Pension Plan ending prior to the date of this
Agreement, calculated on the basis of the actuarial assumptions used in the
most recent actuarial valuation for such Pension Plan as of the date of this
Agreement; (vi) no notice of a "reportable event" (as defined in Section 4043
of ERISA) for which the 30-day reporting requirement has not been waived has
been required to be filed for any Pension Plan within the 12-month period
ending on the date of this Agreement; (vii) neither the Company nor any of its
Subsidiaries has provided, or is required to provide, security to any Pension
 
                                     A-17
<PAGE>
 
Plan pursuant to Section 401(a)(29) of the Code; (viii) each Benefit Plan
which is intended to be "qualified" within the meaning of Section 401(a) of
the Code has been determined by the IRS to be so qualified and such
determination has not been modified, revoked or limited by failure to satisfy
any condition thereof or by a subsequent amendment thereto or a failure to
amend, except that it may be necessary to make additional amendments
retroactively to maintain the "qualified" status of such Benefit Plan; and
(ix) neither the PBGC nor any plan administrator has instituted proceedings to
terminate any of the Benefit Plans subject to Title IV of ERISA other than in
a "standard termination" described in Section 4041(b) of ERISA.
 
  (b) An accurate and complete list of all Benefit Plans is included in the
Company Disclosure Schedule as Schedule 4.09A. Such Schedule 4.09A identifies
the method of funding (including any individual accounting) for all post-
retirement medical or life insurance benefits for the employees of the Company
and the Subsidiaries and discloses the funded status of such plans. With
respect to each of the Benefit Plans, the Company has made available to Newco
a true and correct copy of (i) the most recent annual report on Form 5500
filed with the IRS, (ii) such Benefit Plan, (iii) each trust agreement and
insurance Contract relating to such Benefit Plan, (iv) the most recent summary
plan description for such Benefit Plan, (v) the most recent actuarial report
or valuation if such Benefit Plan is subject to Title IV of ERISA, (vi) the
most recent determination letter issued by the IRS if such Benefit Plan is
intended to be qualified under Section 401(a) of the Code and (vii) any open
requests for rulings or determination letters that pertain to such Benefit
Plan. Other than has been identified on Schedule 4.09A of the Company
Disclosure Schedule, full payment has been made (or proper accruals have been
established to the extent required by GAAP) for all contributions which are
required or for which benefits have accrued prior to the Effective Time under
the terms of each Benefit Plan and for all liabilities which have accrued
prior to the Effective Time under each Benefit Plan.
 
  (c) None of the Company or any other Person that, together with the Company,
is treated as a single employer under Section 414 of the Code (each, including
the Company, a "Commonly Controlled Entity") has incurred any liability to a
Pension Plan under Title IV of ERISA (other than for contributions not yet
due) or to the PBGC (other than for payment of premiums not yet due), which
liability has not been fully paid.
 
  (d) No Commonly Controlled Entity is required to contribute to any
"multiemployer plan" (as defined in Section 4001(a)(3) of ERISA) or has
withdrawn from any multiemployer plan where such withdrawal has resulted or
could result in any "withdrawal liability" (within the meaning of Section 4201
of ERISA) that has not been fully paid.
 
  (e) Each Benefit Plan that is a Welfare Plan may be amended or terminated at
any time after the Effective Time by the Surviving Corporation or any of the
Subsidiaries (as the case may be) without liability to any Person.
 
  Section 4.09B. Canadian Employee Benefits. (a) Except as set forth in
Schedule 4.09B, there are no employee pension or retirement plans, profit
sharing plans, bonus plans, savings plans, deferred compensation plans, stock
option plans, hospitalization plans, insurance plans or other employee benefit
plans, agreements or arrangements maintained by any Subsidiary organized under
the Laws of Canada or any Province thereof for any of its present or former
employee, officer or director (all such plans, agreements and arrangements are
collectively referred to herein as the "Canadian Plans"). Except as would not
individually or in the aggregate have a Material Adverse Effect: (i) each of
the Canadian Plans has been administered in accordance with its terms and in
compliance with all applicable Laws (including, if applicable, the Pension
Benefits Act (Ontario) and the Income Tax Act (Canada)) and all applicable
collective bargaining agreements; and (ii) to the knowledge of the Company,
all Liabilities under each of the Canadian Plans that is a pension plan (as
defined in the Pension Benefits Act (Ontario)) are fully funded, on a going
concern basis, in accordance with the terms of the Canadian Plans, regulatory
requirements as outlined by the Pension Benefits Act (Ontario), administrative
requirements of the Pension Commission of Ontario and the most recent
actuarial report filed with the Pension Commission of Ontario in respect of
the pension plan. Schedule 4.09B identifies the method of funding (including
any individual accounting) for all Canadian Plans providing post-retirement
medical or life insurance benefits and discloses the funded status of such
plans. With respect to each of the Canadian Plans, the Company has made
available to Newco a true and complete copy of (A) the most recent annual
information form filed with the Pension
 
                                     A-18
<PAGE>
 
Commission of Ontario and Revenue Canada Taxation, if applicable, (B) such
Canadian Plan, (C) each trust agreement and insurance contract relating to
such Canadian Plan, if applicable, (D) the most recent summary plan
description for such Canadian Plan, if applicable, (E) the most recent
actuarial report or valuation if such a report is required to be prepared by
Law, and (F) any letter issued by Revenue Canada Taxation confirming
registration of such Canadian Plan under the Income Tax Act (Canada). Other
than has been identified in Schedule 4.09B, full payment has been made (or
proper accruals have been established to the extent required by GAAP) for all
contributions which are required or for which benefits have been accrued prior
to Closing under the terms of each of the Canadian Plans and for all
Liabilities which have accrued prior to the Effective Time under each of the
Canadian Plans.
 
  (b) None of the Company or any of the Subsidiaries is required to contribute
to any "multi-employer pension plan" (as defined in the Pension Benefits Act
(Ontario)) or has withdrawn from any such plan but remains liable to make
contributions to such plan.
 
  (c) Each of the Canadian Plans that is not a pension plan (as defined in the
Pension Benefits Act (Ontario)) may be amended and terminated at any time
after the Effective Time by the Surviving Corporation or any of the
Subsidiaries without liability to any Person.
 
  Section 4.10. Other Compensation Arrangements. Neither the Company nor any
of the Subsidiaries is a party to any (a) consulting agreement with any
present or former director, officer or employee of the Company or any
Subsidiary not terminable without giving more than 60 calendar days notice
involving the payment of more than $500,000 per annum in the aggregate for all
such consulting agreements, (b) union or collective bargaining agreement, (c)
agreement with any director, officer or employee, any of the benefits of which
are contingent, or the terms of which are materially affected or altered, upon
the occurrence of a transaction involving the Company of the nature
contemplated by this Agreement, (d) agreement with any director, officer or
employee providing any term of employment or compensation guarantee extending
for a period longer than two years or (e) Equity Plan, any of the benefits of
which will be increased or affected, or the vesting of the benefits of which
will be accelerated or affected, by the occurrence of any of the transactions
contemplated by this Agreement or the value of any of the benefits of which
will be calculated on the basis of any of the transactions contemplated by
this Agreement.
 
  Section 4.11. Labor Matters. There are no pending or, to the knowledge of
the Company, threatened labor disputes, labor controversies, strikes or work
stoppages in respect of any collective bargaining unit or other group of
employees of the Company or any of the Subsidiaries other than those, if any,
which (individually or in the aggregate) could not reasonably be expected to
have a Material Adverse Effect. To the knowledge of the Company, there are no
organizational efforts presently being made involving any of the presently
unorganized employees of the Company or any Subsidiary which could reasonably
be expected to have a Material Adverse Effect.
 
  Section 4.12. Litigation. The Company has not received any notice of, nor
does it have knowledge of, any pending or threatened suit, claim, action,
proceeding or investigation before any Governmental Authority or arbitrator
against the Company or any of the Subsidiaries, and neither the Company nor
any of the Subsidiaries is subject to any outstanding order, writ, injunction
or decree, in any such case that seeks to restrain the consummation of the
Merger or which could reasonably be expected to have a Material Adverse
Effect.
 
  Section 4.13. Compliance with Applicable Law. (a) The Company and the
Subsidiaries hold, and are in compliance with the terms of, all permits,
licenses, variances, exemptions, orders and approvals of all Governmental
Authorities necessary for the lawful conduct of their respective businesses as
currently conducted (collectively, the "Company Permits"), except for failures
to hold or be in compliance with the terms of such Company Permits that would
not, individually or in the aggregate, have a Material Adverse Effect.
 
  (b) Neither the Company nor any of the Subsidiaries is in violation of or
has been given notice or been charged with any violation of any Law, except
for possible violations that, individually or in the aggregate, would
 
                                     A-19
<PAGE>
 
not have a Material Adverse Effect. No investigation or review by any
Governmental Authority with respect to the Company or any of the Subsidiaries
is pending or, to the knowledge of the Company, threatened, nor has any
Governmental Authority indicated an intention to conduct any such
investigation or review, other than, in each case, those the outcome of which
could not be reasonably expected to have a Material Adverse Effect.
Notwithstanding anything in this Section 4.13, no representation is made under
this Section 4.13 with respect to Environmental Laws or Environmental Permits,
it being understood that any representation relating to Environmental Laws and
Environmental Permits is being made exclusively in Section 4.14.
 
  Section 4.14. Environmental Matters. (a) Except as would not have a Material
Adverse Effect:
 
    (i) each of the Company and the Subsidiaries is and has been in
  compliance with all applicable Environmental Laws and Environmental
  Permits;
 
    (ii) neither the Company nor any of the Subsidiaries has received any
  written notices, demand letters or written requests for information from
  any Governmental Authority or any third party indicating that the Company
  or any Subsidiary is or may be in violation of, or liable under, any
  Environmental Law or Environmental Permit;
 
    (iii) there are no civil, criminal or administrative actions, suits,
  demands, claims, hearings, investigation or proceedings pending or, to the
  knowledge of the Company, threatened against the Company or any of the
  Subsidiaries alleging that they may be in violation of, or liable under,
  any Environmental Law or Environmental Permit; and
     
    (iv) no reports have been filed, or are required to be filed, with any
  Governmental Authority by the Company or any of the Subsidiaries concerning
  the release of any Hazardous Substance or the violation of any
  Environmental Law or Environmental Permit.     
 
  (b) None of the assets currently, or which have ever in the past been,
owned, operated or leased by the Company or any Subsidiary is currently on or
has ever been on, or, to the knowledge of the Company or any Subsidiary, is or
has ever been proposed for listing on, any federal or state "superfund" or
"super lien" list, including CERCLA, and neither the Company nor any
Subsidiary is currently taking, nor has it ever been required to take, any
material corrective action with respect to any of its assets under the
Resource Conservation and Recovery Act or any other Environmental Law.
 
  Section 4.15. Tax Matters. (a) The Company and each of the Subsidiaries has
filed all Federal income tax returns and all other tax returns and reports
required to be filed by it on or before the Effective Time other than those
returns the failure of which to file would not have a Material Adverse Effect.
All such returns are complete and correct in all material respects. The
Company and each of the Subsidiaries has paid (or the Company has paid on the
Subsidiaries' behalf) all Taxes shown as due on such returns or adequate
provision has been made for any such Taxes on the Company's latest balance
sheet included in the Company Financial Statements in accordance with GAAP.
 
  (b) To the knowledge of the Company, no tax return of the Company or any of
its Subsidiaries is under audit or examination by any taxing authority. No
notice of such an audit or examination has been received by the Company or any
of the Subsidiaries other than those which, singly or in the aggregate, could
not reasonably be expected to have a Material Adverse Effect. Any deficiency
resulting from any audit or examination relating to Taxes by any taxing
authority has been paid, except for deficiencies being contested in good
faith. The Federal income tax returns of the Company and each of the
Subsidiaries consolidated in such returns have been examined by and settled
with the IRS for all years, or all years are otherwise closed, through 1990.
 
  (c) There are no assessments or notices of deficiency or proposed
assessments with respect to any Taxes of the Company or any of the
Subsidiaries (or for which the Company or any of the Subsidiaries is liable)
other than those which, singly or in the aggregate, could not reasonably be
expected to have a Material Adverse Effect.
 
  (d) Neither the Company nor any of the Subsidiaries has made or entered
into, or holds any assets subject to, a consent filed pursuant to Section
341(f) of the Code and the regulations thereunder.
 
                                     A-20
<PAGE>
 
  (e) No Liens for Taxes exist with respect to any assets of the Company or
any of the Subsidiaries, except for statutory liens for Taxes not yet due.
 
  (f) None of the Company or any of the Subsidiaries is a party to or is bound
by any tax sharing agreement, tax indemnity obligation or similar agreement,
arrangement or practice with respect to Taxes (including any advance pricing
agreement, closing agreement or other agreement relating to Taxes with any
taxing authority).
 
  (g) The disallowance of a deduction under Section 162(m) of the Code for
employee remuneration will not apply to any amount paid or payable by the
Company or any of the Subsidiaries under any Contract, Benefit Plan, program,
arrangement or understanding currently in effect.
 
  (h) Any amount or other entitlement that could be received (whether in cash
or assets or the vesting of assets) as a result of any of the transactions
contemplated by this Agreement by any employee, officer or director of the
Company or any of its affiliates who is a "disqualified individual" (as such
term is defined in proposed Treasury Regulation Section 1.280G-1) under any
employment, severance or termination agreement, other compensation arrangement
or Benefit Plan currently in effect would not be characterized as an "excess
parachute payment" (as such term is defined in Section 280G(b)(1) of the
Code).
 
  (i) There is no unresolved issue of law or fact arising out of a notice of
deficiency, proposed deficiency or assessment from the IRS or any other taxing
authority with respect to Taxes of the Company or any Subsidiary which, singly
or in the aggregate, could have a Material Adverse Effect.
 
  (j) The liabilities and reserves for Taxes reflected in the latest Company
balance sheet included in the Company Financial Statements are adequate to
cover all Taxes for all periods at or prior to the Effective Time.
 
  Section 4.16. Board Approvals. The Board of Directors of the Company has
approved the Inducement Agreement and each Agreement and Irrevocable Proxy
described in the recitals hereto, the Merger and this Agreement.
 
  Section 4.17. Brokers. No broker, investment banker, financial advisor or
other Person, other than Lazard Freres & Co. LLC ("Lazard"), the fees and
expenses of which will be paid by the Company, is entitled to any broker's,
finder's, financial advisor's or other similar fee or commission in connection
with the transactions contemplated by this Agreement based upon arrangements
made by or on behalf of the Company. The Company has provided Newco true and
correct copies of all agreements between the Company and Lazard.
 
  Section 4.18. Opinion of Financial Advisor. The Board of Directors of the
Company has received the opinion of Lazard, to the effect that the
consideration to be received by the Company's stockholders in the Merger is
fair to such stockholders from a financial point of view.
 
  Section 4.19. Intellectual Property. (a) Except to the extent that the
inaccuracy of any of the following (or the circumstances giving rise to such
inaccuracy), individually and in the aggregate, would not have a Material
Adverse Effect:
 
    (i) the Company and each of the Subsidiaries owns, or is licensed or
  otherwise has the right to use (in each case, free and clear of any Liens),
  all Intellectual Property used in the conduct of its business as currently
  conducted;
 
    (ii) the Company has not received any notice of, nor does it otherwise
  have knowledge of, any pending or threatened Claims that the Company or any
  of the Subsidiaries is infringing on or otherwise violating the rights of
  any Person with regard to any Intellectual Property owned by and/or
  licensed to the Company or any of the Subsidiaries;
 
    (iii) to the knowledge of the Company, no Person is infringing on or
  otherwise violating any right of the Company or any of the Subsidiaries
  with respect to any Intellectual Property owned by and/or licensed to the
  Company or any of the Subsidiaries;
 
                                     A-21
<PAGE>
 
    (iv) to the knowledge of the Company, none of the former or current
  members of management or key personnel of the Company or any of the
  Subsidiaries, including all former and current employees, agents,
  consultants and contractors who have contributed to or participated in the
  conception and development of Intellectual Property of the Company or any
  of the Subsidiaries has asserted in writing any Claim against the Company
  or any of the Subsidiaries claiming proprietary rights to any Intellectual
  Property of the Company or any of the Subsidiaries; and
 
    (v) the execution and delivery of this Agreement, compliance with its
  terms and the consummation of the transactions contemplated hereby do not
  and will not conflict with or result in any violation or default (with or
  without notice or lapse of time or both), or right of termination or
  cancellation of any Intellectual Property right or obligation, or the loss
  or encumbrance of any Intellectual Property or benefit related thereto, or
  result in or require the creation, imposition or extension of any Lien upon
  any Intellectual Property or right.
 
  (b) For purposes of this Agreement, "Intellectual Property" means, with
respect to any Person, all (i) trademarks and service marks (registered or
unregistered), (ii) assumed names and trade names, (iii) the goodwill
associated with the foregoing, (iv) registrations in any jurisdiction of, and
applications in any jurisdiction to register, the foregoing, including any
extension, modification or renewal of any such registration or application,
(v) inventions, discoveries and ideas, whether patented, patentable or not in
any jurisdiction, (vi) trade secrets and confidential information, (vii)
writings and other copyrightable works, (viii) registration or applications
for registration of copyrights in any jurisdiction, and any renewals or
extensions thereof and (ix) licenses relating to the foregoing, in each case,
owned, held or licensed by such Person.
 
  Section 4.20. No Default. Neither the Company nor any of its Subsidiaries is
in default or breach of any Contract to which it is a party and, to the
knowledge of the Company, there exists no condition which, with the giving of
notice or lapse of time or both would constitute such a default or breach,
except for conditions, defaults and breaches which individually and in the
aggregate do not, and could not reasonably be expected to, have a Material
Adverse Effect.
 
  Section 4.21. Enforceability of Contracts. Except as would not have a
Material Adverse Effect, all Contracts to which the Company or any Subsidiary
is a party have been duly executed and delivered by it and, assuming such
Contracts constitute valid and binding obligations of the other parties
thereto, constitute its valid and binding obligations, enforceable against it
in accordance with their terms, except that (a) such enforcement may be
subject to bankruptcy, insolvency, moratorium or similar Laws affecting
creditors' rights and (b) the remedy of specific performance and injunctive
and other forms of equitable relief are subject to certain equitable defenses
and to the discretion of the court before which any proceedings therefor may
be brought.
 
  Section 4.22. Absence of Voting Agreements. Except as provided in this
Agreement, to the knowledge of the Company, there exist no voting trusts,
proxies or voting agreements relating to any shares of capital stock (or any
other equity interests) of the Company or any of the Subsidiaries.
 
  Section 4.23. Title to Assets. The Company and each of the Subsidiaries has
good and indefeasible title in fee simple to all of its real property and good
title to all of its leasehold interests and other properties as reflected in
the most recent balance sheet included in the Company Financial Statements,
other than such properties that have been disposed of in the ordinary course
of business since the date of such balance sheet, free and clear of all Liens
except (a) statutory liens for Taxes not yet due, (b) such imperfections in
title, easements and Liens, if any, as are not substantial in character,
amount or extent and do not materially detract from the value or interfere
with the present use of the property subject thereto or affected thereby or
otherwise materially impair the business operations of the Company or any
Subsidiary as presently carried on, (c) Liens existing on the date hereof
securing indebtedness for borrowed money reflected in such balance sheet and
(d) other matters which, singly or in the aggregate, could not reasonably be
expected to have a Material Adverse Effect. All leases under which the Company
or any Subsidiary leases any real or personal property are in good standing,
valid and effective in accordance with their terms, and there are not, under
any of such leases, any existing default on the part of the Company or any
Subsidiary or, to the knowledge of the Company, any other party thereto or, to
the knowledge
 
                                     A-22
<PAGE>
 
of the Company, any event which, with notice or lapse of time or both would
have become a default, other than defaults under such leases which, singly or
in the aggregate, could not reasonably be expected to have a Material Adverse
Effect.
 
  Section 4.24. Insurance. The Company Disclosure Schedule sets forth a
complete list of all insurance policies currently in force for which the
Company and the Subsidiaries paid or are obligated to pay all or any part of
the premiums. All such policies are in full force and effect on the date of
this Agreement, and all premiums due thereon have been paid, the Company and
the Subsidiaries have complied with the provisions of each applicable policy
and, to the knowledge of the Company, there are no pending claims against any
such insurance by the Company or any of the Subsidiaries as to which insurers
have denied liability (although insurers have in many instances and as a
matter of course undertaken defense subject to reservation of rights to deny
liability), except for such failure to pay premiums, non-compliance claims or
other matters that, alone or in the aggregate, could not reasonably be
expected to have a Material Adverse Effect. The Company Disclosure Schedule
sets forth a complete and accurate list and description of all self-insurance
arrangements which are required to be maintained by applicable Law affecting
the Company or any of the Subsidiaries, and such self-insurance arrangements
are in full force and effect and are in compliance with all requirements of
applicable Law where the failure to comply could reasonably be expected to
have a Material Adverse Effect.
 
  Section 4.25. Condition of Company Properties. Since September 30, 1995, the
facilities of the Company and the Subsidiaries have been maintained in a
manner consistent with past practice.
 
  Section 4.26. Company Stockholder Approval. The affirmative vote of
stockholders of the Company required for the approval and adoption of this
Agreement, the Merger and the transfer of assets contemplated by Section 7.12
is a majority of the issued and outstanding shares of Company Common Stock
entitled to vote thereon (the "Company Stockholder Approval").
 
                                   ARTICLE V
 
                    REPRESENTATIONS AND WARRANTIES OF NEWCO
 
  Except as otherwise set forth on the disclosure schedule heretofore
delivered by Newco to the Company which makes reference to this Agreement (the
"Newco Disclosure Schedule"), Newco represents and warrants to the Company as
follows:
 
  Section 5.01. Organization. Newco is a corporation duly organized, validly
existing and in good standing under the Laws of the State of Delaware and has
all requisite corporate power and corporate authority and all necessary
Governmental Approvals to own, lease and operate its properties and to carry
on its business as now being conducted, except where the failure to have such
Governmental Approvals would not, when taken together with all such other
failures, have a Material Adverse Effect. Newco is duly qualified or licensed
to do business and is in good standing in each jurisdiction in which the
properties owned, leased or operated by it or the nature of the business
conducted by it makes such qualification or licensing necessary, except where
the failure to be so duly qualified or licensed and in good standing would
not, when taken together with all other such failures, have a Material Adverse
Effect. Newco has made available to the Company complete and correct copies of
its Certificate of Incorporation and By-laws, in each case as amended to the
date of this Agreement.
 
  Section 5.02. Capitalization. The authorized capital stock of Newco consists
of 900,000 shares of Newco Common Stock, of which 84 shares are issued and
outstanding on the date hereof. All of the outstanding shares of Newco Common
Stock are duly authorized, validly issued, fully paid and nonassessable and
free of any preemptive rights in respect thereto. Except as set forth in this
Section 5.02, as of the date hereof, (a) no shares of capital stock or other
voting securities of Newco are outstanding and (b) no equity equivalents,
interests in the ownership of Newco or other similar rights are outstanding.
 
  Section 5.03. Authority. (a) Newco has the requisite corporate power and
authority to execute and deliver this Agreement and, subject to the Newco
Stockholder Approval and the Newco Required Statutory Approvals,
 
                                     A-23
<PAGE>
 
to consummate the transactions contemplated hereby. Upon obtaining the Newco
Stockholder Approval, the execution, delivery and performance of this
Agreement and the consummation of the transactions contemplated hereby have
been duly authorized by all necessary corporate action on the part of Newco
and no other corporate proceedings on the part of Newco are necessary to
authorize this Agreement or to consummate such transactions. No vote of
Newco's stockholders is required to approve this Agreement or the other
transactions contemplated hereby except for the Newco Stockholder Approval. No
vote of Newco stockholders is required to approve this Agreement or the other
transactions contemplated hereby other than those which have been obtained or
made and are in full force and effect.
 
  (b) This Agreement has been duly executed and delivered by Newco and,
assuming this Agreement constitutes a valid and binding obligation of the
Company, constitutes a valid and binding obligation of Newco enforceable
against it in accordance with its terms, except (i) that such enforcement may
be subject to bankruptcy, insolvency, moratorium or similar Laws affecting
creditors' rights and (ii) that the remedy of specific performance and
injunctive and other forms of equitable relief are subject to certain
equitable defenses and to the discretion of the court before which any
proceedings therefor may be brought. Without limitation of the foregoing, each
of the covenants and obligations of Newco set forth in Articles VII and X is
valid, binding and enforceable as aforesaid notwithstanding the absence of the
Newco Stockholder Approval.
 
  Section 5.04. Consents and Approvals; No Violations. (a) The execution and
delivery of this Agreement by Newco do not violate, conflict with or result in
any breach of any provision of, or constitute a default (or an event which,
with notice or lapse of time or both, would constitute a default) under, or
result in the termination of, or accelerate the performance required by, or
result in a right of termination or acceleration under, or give rise to any
obligation to make payments or provide compensation under, or result in the
creation of any Lien upon any of the properties of Newco, under any of the
terms, conditions or provisions of (i) the Certificate of Incorporation or By-
laws of Newco, (ii) any Law, permit or license applicable to Newco or any of
its properties or (iii) any Contract to which Newco is now a party or by which
Newco or any of its properties may be bound or affected. Neither the
performance of this Agreement by Newco nor the consummation by Newco of the
transactions contemplated hereby will result in any violation, conflict,
breach, termination, acceleration or creation or any Liens under any of the
terms, conditions or provisions described in clauses (i) through (iii) above,
subject, in the case of the terms, conditions or provisions described in
clause (ii) above, to obtaining (prior to the Effective Time) the Newco
Required Statutory Approvals. Excluded from the foregoing sentences of this
paragraph (a), insofar as they apply to the terms, conditions or provisions
described in clauses (ii) and (iii) of the first sentence of this paragraph
(a), are such violations, conflicts, breaches, defaults, terminations,
accelerations, payments, compensations or creations of Liens that,
individually or in the aggregate, would not prevent or delay beyond the
Outside Date the consummation of the Merger.
 
  (b) Except for the Newco Required Statutory Approvals, no declaration,
filing or registration with, or notice to, or authorization, consent or
approval of, any Governmental Authority is necessary for the execution and
delivery of this Agreement by Newco or the consummation by Newco of the
transactions contemplated hereby, other than such declarations, filings,
registrations, notices, authorizations, consents or approvals which, if not
made or obtained (as the case may be), would not, individually or in the
aggregate, prevent or delay beyond the Outside Date the consummation of the
Merger.
 
  Section 5.05. Company Required SEC Filings. None of the information supplied
or to be supplied by Newco or Operating Sub specifically for inclusion or
incorporation by reference in any Company Required SEC Filing will, as of the
date filed with or declared effective by the SEC or at the time of mailing to
the Company's stockholders or at the Effective Time, contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein not
misleading.
 
  Section 5.06. Interim Operations of Newco. Newco was formed solely for the
purpose of engaging in the transactions contemplated hereby, has engaged in no
other business activities and has conducted its operations only as
contemplated hereby. Prior to the Effective Time, Newco will (a) not engage in
any business activities other than the business activities contemplated hereby
(including business activities contemplated by or
 
                                     A-24
<PAGE>
 
reasonably incident to the Financing and the Newco SEC Filings) and (b)
conduct its operations only as contemplated hereby (including operations
contemplated by or reasonably incident to the Financing and the Newco SEC
Filings). As of the date hereof, Newco has no subsidiaries and, during the
period commencing with the date hereof and ending at the Effective Time, Newco
will have no subsidiaries other than Operating Sub and other directly or
indirectly wholly-owned subsidiaries of Newco, the formation of which are
deemed necessary or desirable by Newco in connection with the consummation of
the transactions contemplated hereby. As of the date of this Agreement, Newco
has no affiliates (which term, for purposes of this sentence only, has the
meaning specified in Section 2 of the Competition Act) with assets in Canada
or with gross revenues from sales in, from or into Canada.
 
  Section 5.07. Brokers. No broker, investment banker, financial advisor or
other Person, other than The Sterling Group, Inc., The Unicorn Group and CS
First Boston Corporation, the fees and expenses of which will be paid by
Newco, is entitled to any broker's, finder's, financial advisor's or other
similar fee or commission in connection with the transactions contemplated by
this Agreement based upon arrangements made by or on behalf of Newco.
 
  Section 5.08. Newco Stockholder Approval. The affirmative vote of
stockholders of Newco required for the approval and adoption of this Agreement
and the Merger is a majority of the issued and outstanding shares of Newco
Common Stock entitled to vote thereon (the "Newco Stockholder Approval").
 
                                  ARTICLE VI
 
                               CERTAIN COVENANTS
 
  Section 6.01. Conduct of Company Business Pending the Merger. From the date
hereof until the Effective Time, the Company will perform and observe, and
will cause each of the Subsidiaries to perform and observe, each of the
following covenants in all respects, except (i) as expressly contemplated or
permitted by this Agreement, (ii) as expressly set forth in the Company
Disclosure Schedule or (iii) to the extent that Newco shall otherwise consent
in writing:
 
    (a) Ordinary Course. The Company shall, and shall cause each of the
  Subsidiaries to, (i) carry on its business in the usual, regular and
  ordinary course and consistent with past practice, (ii) use all reasonable
  efforts to preserve intact its present business organizations, keep
  available the services of its present officers and employees and preserve
  its good will and relationships with customers, suppliers and others having
  business dealings with it and (iii) not engage in any action with the
  intent to adversely impact the transactions contemplated by this Agreement.
 
    (b) Dividends; Changes in Stock. The Company shall not, and it shall not
  permit any of the Subsidiaries to, (i) declare, set aside or pay any
  dividends on or make other distributions in respect of any of its capital
  stock (or any other equity interest) other than dividends and other
  distributions payable to the Company or any wholly-owned Subsidiary, (ii)
  split, combine or reclassify any of its capital stock (or any other equity
  interest) or issue or authorize or propose the issuance of any other
  securities in respect of, in lieu of or in substitution for shares of its
  capital stock (or any other equity interest) or (iii) repurchase, redeem or
  otherwise acquire, or offer to repurchase, redeem or otherwise acquire, any
  shares of its capital stock (or any other equity interest), other than
  repurchases, redemptions or other acquisition of shares of capital stock by
  any Subsidiary organized under the Laws of Canada or any Province thereof
  in the ordinary course of business consistent with past practice.
 
    (c) Issuance of Securities. The Company shall not, and it shall not
  permit any of the Subsidiaries to, issue, deliver, sell or dispose of, or
  authorize or propose the issuance, delivery, sale or disposition of, any
  shares of its capital stock (or any other equity interest), any Stock
  Acquisition Rights, any stock appreciation rights, any phantom stock or any
  restricted stock other than (i) the issuance of shares of Company Common
  Stock upon the exercise of stock options granted under the Omnibus Stock
  Plan and outstanding on the date of this Agreement and in accordance with
  the present terms of such options and (ii) issuances by a
 
                                     A-25
<PAGE>
 
  Subsidiary of its capital stock (or any other equity interest) to the
  Company or any wholly-owned Subsidiary; provided, however, that for
  purposes of this Section 6.01(c), the vesting of any SAR, the payment of
  any amount in connection with the discharge of any phantom stock upon the
  resignation or retirement from the Company or any Subsidiary by the holder
  thereof and the actions contemplated by Section 7.06 shall not constitute
  the issuance, delivery, sale or other disposition of any shares of capital
  stock, Stock Acquisition Rights, stock appreciation right, phantom stock or
  restricted stock.
 
    (d) Compensation of Officers. The Company shall not, and it shall not
  permit any of the Subsidiaries to, (i) grant to any officer of the Company
  or any of the Subsidiaries (A) any increase in compensation, except in the
  ordinary course of business (including in connection with promotions)
  consistent with prior practice or as was required under employment
  agreements in effect as of the date hereof or (B) any increase in severance
  or termination pay, except as part of a standard employment package to any
  Person promoted or hired (but not including the five most senior officers),
  or as was required under employment, severance or termination agreements in
  effect as of the date hereof, or (ii) enter into any employment, severance
  or termination agreement with any officer of the Company or any of the
  Subsidiaries; provided, however, that nothing contained in this Section
  6.01(d) shall prohibit any of the Subsidiaries from replacing any of its
  existing officers that resign or otherwise terminate their position as an
  officer of such Subsidiary on terms and in a manner customary for such
  Subsidiary provided that the Company gives notice of such action to Newco
  in reasonable detail prior to such replacement.
 
    (e) Benefit Plans. Except as provided in paragraph (c) above, the Company
  shall not, and it shall not permit any of the Subsidiaries to, increase the
  benefits available under or establish any Benefit Plan or Canadian Plan
  (other than amendments to Welfare Plans and their Canadian counterparts in
  the ordinary course of business and increases in compensation payable to
  non-officer employees of the Company or any Subsidiary in the ordinary
  course of business consistent with past practice), including the granting
  of stock options, stock appreciation rights, performance awards or
  restricted stock awards or the amendment or acceleration of vesting of any
  existing stock options, stock appreciation rights, performance awards or
  restricted stock awards.
 
    (f) Governing Documents. The Company shall not, and it shall not permit
  any of the Subsidiaries to, amend or propose to amend its Certificate of
  Incorporation or By-laws or comparable organizational documents.
 
    (g) No Acquisitions. The Company shall not, and it shall not permit any
  of the Subsidiaries to, (i) acquire or agree to acquire (by merger,
  consolidation, acquisition of stock or assets or by any other manner) any
  business or any corporation, partnership, association or other business
  organization or division thereof or (ii) except in the ordinary course of
  business, make or agree to make any investment (by purchase of stock,
  contribution to capital, property transfer or purchase of property or
  otherwise) in any other Person.
 
    (h) No Dispositions. The Company shall not, and it shall not permit any
  of the Subsidiaries to, sell, lease, license, encumber or otherwise dispose
  of, or agree to sell, lease, license, encumber or otherwise dispose of, any
  of its assets, except in the ordinary course of business consistent with
  prior practice.
 
    (i) Indebtedness. The Company shall not, and it shall not permit any of
  the Subsidiaries to:
 
      (i) incur (which shall not be deemed to include entering into credit
    agreements, lines of credit or similar arrangements until borrowings
    are made under such arrangements) any indebtedness for borrowed money;
 
      (ii) guarantee any such indebtedness;
 
      (iii) issue or sell any debt securities or warrants or rights to
    acquire any debt securities of the Company or any of the Subsidiaries;
    or
 
      (iv) guarantee any debt securities of others,
 
                                     A-26
<PAGE>
 
  except in the ordinary course of business consistent with prior practice
  and which, in any event, when added to the aggregate amount of all such
  incurrences, guarantees, issuances and sales made or committed to be made
  by the Company and all the Subsidiaries after the date hereof, does not
  exceed $5,000,000; provided, however, that such $5,000,000 limit shall not
  be applicable to or otherwise affected by borrowings and reborrowings in
  the ordinary course of business under revolving credit facilities which
  were in existence prior to the date hereof.
 
    (j) Advise of Changes; Filings. The Company shall confer on a regular and
  frequent basis with Newco to report generally on operational matters and
  shall promptly advise Newco orally and in writing of any events causing a
  Material Adverse Effect or which may reasonably be expected to have a
  Material Adverse Effect. The Company shall promptly provide to Newco (or
  its counsel) copies of all filings made by the Company with any
  Governmental Authority in connection with this Agreement and the
  transactions contemplated hereby.
 
    (k) Tax Matters. From the date of this Agreement, the Company shall not
  make any tax election, or settle or compromise any income tax liability of
  the Company or any of its Subsidiaries, that would have a Material Adverse
  Effect or that involves a payment by or to the Company or any Subsidiary of
  more than $1,500,000. The Company shall, before filing or causing to be
  filed any material tax return of the Company or any of the Subsidiaries,
  consult with Newco and its advisors as to the material positions and
  elections that may be taken or made with respect to such return.
 
    (l) Discharge of Liabilities. The Company shall not, and it shall not
  permit any of the Subsidiaries to, pay, discharge, settle or satisfy any
  Claims, Liabilities or Losses, other than the payment, discharge or
  satisfaction, in the ordinary course of business consistent with past
  practice or in accordance with their respective terms, of Liabilities
  recognized or disclosed in the most recent balance sheet (or the notes
  thereto) of the Company included in the Company Financial Statements or
  incurred since the date of such balance sheet in the ordinary course of
  business consistent with past practice, or waive the benefits of, or agree
  to modify in any manner, any confidentiality, standstill or similar
  agreement to which the Company or any of the Subsidiaries is a party.
 
    (m) Material Contracts. Except in the ordinary course of business, the
  Company shall not, and it shall not permit any of the Subsidiaries to,
  modify, amend or terminate any material Contract to which the Company or
  such Subsidiary is a party or waive, release or assign any material rights
  or Claims.
 
    (n) Capital Expenditures. Except in the ordinary course of business or as
  set forth in the Company Disclosure Schedule, the Company shall not, and it
  shall not permit any of the Subsidiaries to, make or commit to make any
  capital expenditure in an amount which, when added to the aggregate amount
  of all other capital expenditures made or committed to be made by the
  Company and all the Subsidiaries after the date hereof, exceeds
  $10,000,000.
 
    (o) Accounting Procedures. Except as required by GAAP or applicable Law,
  the Company shall not, and it shall not permit any of the Subsidiaries to,
  make or commit to make any material changes in its accounting procedures.
 
    (p) Other Matters. The Company shall not, and it shall not permit any of
  the Subsidiaries to, take or agree to take any action that (i) would result
  in any of the Company's representations and warranties contained in this
  Agreement that are qualified as to materiality becoming untrue, (ii) would
  result in any of such representations and warranties that are not so
  qualified becoming untrue in any material respect or (iii) to the Company's
  knowledge, could reasonably be expected to have a Material Adverse Effect.
 
  Section 6.02. No Solicitation. (a) The Company shall immediately cease any
discussions or negotiations with any parties (other than Newco) that may be
ongoing with respect to the direct or indirect acquisition or purchase of all
or any substantial amount of the business or assets of the Company or any of
the Subsidiaries or any capital stock or other equity interests of the Company
or any of the Subsidiaries, whether by merger, consolidation, business
combination, sale of assets, sale of securities, tender offer, exchange offer,
 
                                     A-27
<PAGE>
 
recapitalization, liquidation, dissolution or otherwise, and whether for cash,
securities or any other consideration or combination thereof (an "Acquisition
Transaction"). After the date hereof and prior to the Effective Time or
earlier termination of this Agreement:
 
    (i) the Company shall not, and shall not permit any of the Subsidiaries
  to, (A) solicit, initiate, encourage (including by way of furnishing
  information) or take any other action to facilitate any Acquisition
  Transaction or (B) participate in any discussions or negotiations regarding
  any Acquisition Transaction, and
 
    (ii) the Company shall, and shall cause each of the Subsidiaries to, use
  its reasonable best efforts to cause its officers, directors and employees
  and any investment banker, financial advisor, attorney, accountant or other
  agent or representative retained by it to not, (A) solicit, initiate,
  encourage (including by way of furnishing information) or take any other
  action to facilitate any Acquisition Transaction or (B) participate in any
  discussions or negotiations regarding any Acquisition Transaction;
 
provided, however, that if, at any time prior to the Effective Time or the
earlier termination of this Agreement, the Board of Directors of the Company
reasonably determines in good faith, (1) after consultation with one or more
of the Company's independent financial advisors, that providing confidential
or non-public information to a financially capable Person (a "Potential
Acquiror") could lead to an Acquisition Transaction more favorable to the
stockholders of the Company than the Merger and (2) after consultation with
the Company's outside legal counsel, that there is a significant risk that the
failure to provide such confidential or non-public information to such
Potential Acquiror would constitute a breach of its fiduciary duty to the
stockholders of the Company, the Company may, in response to a Takeover
Proposal received by the Company after the date hereof and subject to
compliance with Section 6.02(c), (x) furnish confidential or non-public
information with respect to the Company to such Potential Acquiror pursuant to
a customary confidentiality agreement and (y) participate in negotiations with
such Potential Acquiror regarding such Takeover Proposal. As used herein,
"Takeover Proposal" means any proposal or offer (regardless of when received
or made) from a Potential Acquiror relating to an Acquisition Transaction.
 
  (b) Except as set forth in this Section 6.02(b), neither the Board of
Directors of the Company nor any committee thereof shall (i) withdraw or
modify, or propose to withdraw or modify, in a manner adverse to Newco, the
approval or recommendation by such Board of Directors or such committee of
this Agreement or the Merger, (ii) approve or recommend to the stockholders of
the Company, or propose to approve or recommend to the stockholders of the
Company, any Takeover Proposal or (iii) cause the Company to accept or enter
into any agreement with respect to any Takeover Proposal; provided, however,
that nothing contained in this Section 6.02(b) will prohibit the Company from
entering into any confidentiality agreement or taking any other action
incidental to the actions permitted pursuant to the proviso to paragraph (a)
above so long as the Company does not accept a Takeover Proposal.
Notwithstanding the foregoing, in the event that, prior to the Effective Time
or the earlier termination of this Agreement, the Board of Directors of the
Company reasonably determines in good faith:
 
    (1) after consultation with its financial advisor, that a Takeover
  Proposal made to the Company after the date hereof is more favorable to the
  stockholders of the Company than the Merger and that acceptance of such
  Takeover Proposal is in the best interests of the stockholders of the
  Company, and
 
    (2) after consultation with its outside legal counsel, that there is a
  significant risk that the failure to take any such action would constitute
  a breach of its fiduciary duties to the Company's stockholders,
 
the Board of Directors of the Company may withdraw or modify its approval or
recommendation of this Agreement and the Merger, approve or recommend such
Takeover Proposal or cause the Company to accept the Takeover Proposal and/or
enter into an agreement with respect to such Takeover Proposal; provided,
however, that the Board of Directors of the Company may only take any such
action if:
 
    (A) at least seven days prior to the formal acceptance of such Takeover
  Proposal, the Company shall have furnished Newco with a written notice
  advising Newco that the Board of Directors of the Company
 
                                     A-28
<PAGE>
 
  has received such Takeover Proposal and enclosing a copy of such Takeover
  Proposal or a description (in reasonable detail) of the material terms and
  conditions thereof and identifying the Potential Acquiror making such
  Takeover Proposal,
 
    (B) such Takeover Proposal relates to the acquisition by such Potential
  Acquiror, for consideration consisting of cash and/or securities, of more
  than 50% of the shares of Company Common Stock then outstanding or all or
  substantially all the assets of the Company and the Subsidiaries, and
 
    (C) the Company shall, prior to or simultaneously with the taking of such
  action, have paid or pay to Newco or its designee the break-up fee referred
  to in Section 9.02.
 
  (c) In addition to the obligations of the Company set forth in paragraphs
(a) and (b) of this Section 6.02, if the Company determines to provide any
confidential or non-public information or negotiate as described in the
proviso to paragraph (a) above, or if it receives any request for confidential
or non-public information or any Takeover Proposal, the Company shall
immediately (i) advise Newco orally and in writing that information is to be
provided, that negotiations with respect to an Acquisition Transaction are to
take place or that such request or Takeover Proposal has been received, (ii)
inform Newco orally and in writing of the identity of the Person making such
request or Takeover Proposal and (iii) furnish to Newco either a copy of such
request or Takeover Proposal or a description (in reasonable detail) of the
material terms and conditions thereof. The Company will keep Newco informed of
the status and principal terms of any such request or Takeover Proposal in a
manner that will provide Newco with sufficient and timely knowledge of such
status and terms and permit Newco meaningfully to respond thereto.
 
  (d) Nothing contained in this Section 6.02 shall prohibit the Company from
taking and disclosing to its stockholders a position contemplated by Rule 14e-
2(a) promulgated under the Exchange Act or from making any disclosure to the
Company's stockholders if the Board of Directors of the Company determines in
good faith, after consultation with the Company's outside legal counsel, that
there is a significant risk that the failure to make such disclosure would
constitute a breach of its fiduciary duty to the stockholders of the Company
under applicable Law; provided, however, that neither the Company nor its
Board of Directors nor any committee thereof shall, except as permitted by
Section 6.02(b), (i) withdraw or modify, or propose to withdraw or modify, in
a manner adverse to Newco, the approval or recommendation by such Board of
Directors or such committee of this Agreement or the Merger, (ii) approve or
recommend, or propose to approve or recommend, any Takeover Proposal or (iii)
cause the Company to accept or enter into any agreement with respect to any
Takeover Proposal.
 
                                  ARTICLE VII
 
                             ADDITIONAL AGREEMENTS
 
  Section 7.01. Stockholder Approval; SEC Filings; Proxy Statement. (a) The
Company will, as soon as practicable following the execution of this
Agreement, duly call, give notice of, convene and hold a meeting of its
stockholders (the "Stockholders Meeting") for the purpose of obtaining the
Company Stockholder Approval. Subject to Section 6.02(b), the Company will,
through its Board of Directors, recommend to its stockholders that they
approve and adopt this Agreement and the Merger. Subject to the fiduciary
duties of the Board of Directors of the Company under applicable law, the
Company shall use its reasonable best efforts to obtain the Company
Stockholder Approval as soon as practicable.
 
  (b) As soon as practicable following the execution of this Agreement, the
Company will prepare and file with the SEC a preliminary form of the Proxy
Statement and any other Company Required SEC Filings (provided that the
Company shall not make any filing with the SEC pursuant to the Securities Act
relating to the Merger until after the date contemplated in Section 7.07(d)
for the delivery of the Definitive Equity Documents) and will use its
reasonable best efforts to (i) respond to any comments of the SEC or its
staff, (ii) have any Company Required SEC Filings declared effective by the
SEC (if required) as promptly as practicable and (iii) cause the Proxy
Statement to be mailed to the Company's stockholders as promptly as
practicable after responding to all such comments to the satisfaction of the
SEC or its staff. The Company shall also take any action required to be
 
                                     A-29
<PAGE>
 
taken under applicable state "Blue-Sky" or other securities Laws in connection
with the performance of the Company's obligations pursuant to this Agreement.
The Company will notify Newco promptly of the receipt of any comments from the
SEC or its staff and of any request by the SEC or its staff for amendments or
supplements to any of the Company Required SEC Filings or for additional
information and will supply Newco with copies of all correspondence between
the Company or any of its representatives, on the one hand, and the SEC or its
staff, on the other hand, with respect to the Company Required SEC Filings or
the Merger. If at any time prior to the Stockholders Meeting there shall occur
any event that should be set forth in an amendment or supplement to any of the
Company Required SEC Filings, the Company will promptly prepare and file with
the SEC and/or mail to its stockholders such an amendment or supplement. If at
any time prior to the Effective Time, any event shall occur with respect to
the Company or any Subsidiary, information with respect to which should be set
forth in an amendment or supplement to any of the Newco SEC Filings or
Operating Sub SEC Filings in order to make the information contained therein
with respect to the Company or any Subsidiary not misleading, the Company
shall, and shall cause the Subsidiaries to, provide Newco with such
information. Each of the Company and Newco shall, and Newco shall cause
Operating Sub to, take all reasonable actions and promptly supply such
information to the other as is reasonably requested of any of them, and shall
otherwise cooperate with each other in connection with the matters described
in this Section 7.01(b).
 
  (c) As soon as practicable following the execution of this Agreement, Newco
will, and will cause Operating Sub to, prepare and file with the SEC such of
the Newco SEC Filings and Operating Sub SEC Filings as it deems necessary in
connection with the Financing and Newco will, and will cause Operating Sub to,
use its reasonable best efforts to (i) respond to any comments of the SEC or
its staff, and (ii) have such Newco SEC Filings and Operating Sub SEC Filings
declared effective by the SEC (if required) as promptly as practicable. Newco
shall also take, and cause Operating Sub to take, any action required to be
taken under applicable state "Blue-Sky" or other securities Laws in connection
with the issuance by Newco or Operating Sub of securities in connection with
the Financing. If at any time prior to the Effective Time, any event shall
occur with respect to Newco or Operating Sub, information with respect to
which should be set forth in an amendment or supplement to any of the Company
Required SEC Filings in order to make the information contained therein with
respect to Newco or Operating Sub not misleading, Newco shall, and shall cause
Operating Sub to, provide the Company with such information. Each of the
Company and Newco shall take all reasonable actions and promptly supply such
information to the other as is reasonably requested of any of them, and shall
otherwise cooperate with each other in connection with the matters described
in this Section 7.01(c).
 
  (d) Newco will, as soon as practicable following the execution of this
Agreement, duly call, give notice of, convene and hold a meeting of its
stockholders for the purpose of obtaining the Newco Stockholder Approval or
obtain the Newco Stockholder Approval by written consent. Subject to the
fiduciary duties of the Board of Directors of Newco, Newco will, through its
Board of Directors, recommend to its stockholders that they approve and adopt
this Agreement and the Merger and use its reasonable best efforts to obtain
the Newco Stockholder Approval as soon as practicable.
 
  Section 7.02. Access to Information. (a) Upon reasonable notice, the Company
shall afford to Newco and to the officers, employees, independent accountants,
counsel and other representatives of Newco full access, during normal business
hours during the period prior to the Effective Time, to all its properties,
books, Contracts, commitments and records and, during such period, the Company
shall (and shall cause each of the Subsidiaries to) furnish promptly to Newco
(i) a copy of each report, schedule, registration statement and other document
filed or received by it during such period pursuant to the requirements of the
Federal securities laws, (ii) a copy of each return and other document filed
or received by it during such period pursuant to the requirements of the
Federal tax laws and (iii) all other information concerning its business,
properties and personnel as Newco may reasonably request. Neither the Company
nor any Subsidiary shall be liable to any Person who enters on or inspects any
of the properties of the Company or any Subsidiary pursuant to the terms of
this Agreement for any costs, damages, expenses, liabilities or obligations
arising out of or resulting from such entry or inspection unless caused by the
gross negligence or willful misconduct of the Company or any Subsidiary.
 
                                     A-30
<PAGE>
 
  (b) Newco acknowledges receipt of a copy of that certain Confidentiality
Agreement dated as of November 10, 1995 between the Company and The Sterling
Group, Inc. (as amended, the "Confidentiality Agreement") and agrees that any
and all information, correspondence, documents and other materials provided or
made available to Newco by or on behalf of the Company or any Subsidiary
pursuant to or in connection with this Agreement shall be subject to the
confidentiality requirements of the Confidentiality Agreement, the same as if
Newco were originally a party thereto; provided, however, that notwithstanding
the foregoing, in no event shall Newco be prohibited from making any
disclosure that is necessary or appropriate in order to obtain the Financing
or to satisfy or comply with any covenant, condition or agreement to be
satisfied or complied with by it or Operating Sub under this Agreement.
 
  (c) No investigation pursuant to this Section 7.02 or any other provision of
this Agreement shall affect any representations or warranties of the Parties
herein or the conditions to the obligations of the Parties hereunder.
 
  (d) The foregoing shall not require the Company to permit any inspection, or
to disclose any information, which in the reasonable judgment of the Company
would result in the disclosure of any trade secrets of third parties or
violate any obligation of the Company with respect to confidentiality if the
Company shall have used its reasonable best efforts to obtain the consent of
such third party to such inspection or disclosure.
 
  Section 7.03. Reasonable Efforts. Each Party agrees to use its reasonable
best efforts to take, and Newco agrees to cause Operating Sub to use its
reasonable best efforts to take, (a) all reasonable actions necessary to
comply promptly with all legal requirements which may be imposed on it with
respect to the Merger (which actions shall include, without limitation,
furnishing all information required under the HSR Act and in connection with
Governmental Approvals) and will promptly cooperate with and furnish
information to the other Party in connection with any such requirements
imposed upon it or any of its affiliates in connection with the Merger and (b)
all reasonable actions necessary to obtain (and will cooperate with the other
Party or with the Parties in obtaining) any consent, authorization, order or
approval of, or any exemption by, any Governmental Authority or other public
or private third party required to be obtained or made by it in connection
with the Merger or the taking of any action contemplated thereby or by this
Agreement.
 
  Section 7.04. Notification of Certain Matters. Each of the Parties agrees to
give prompt notice to the other of, and to use its reasonable best efforts to
prevent or promptly remedy, (a) the occurrence or failure to occur or the
impending or threatened occurrence or failure to occur, of any event which
occurrence or failure to occur would be to likely be to cause any of its
representations or warranties in this Agreement to be untrue or inaccurate in
any material respect at any time from the date hereof to the Effective Time
and (b) any material failure on its part to comply with or satisfy any
covenant, condition or agreement to be complied with or satisfied by it
hereunder; provided, however, that the delivery of any notice pursuant to this
Section 7.04 shall not limit or otherwise affect the remedies available
hereunder to the Party receiving such notice.
 
  Section 7.05. Publicity. Neither Party shall issue any press release or
otherwise make any public announcement with respect to this Agreement or the
subject matter hereof without first consulting with the other Party.
 
  Section 7.06. Stock Acquisition Rights, etc. (a) Immediately prior to the
Effective Time, the Company shall take such action (including, without
limitation, the adoption of appropriate resolutions by the Board of Directors
of the Company or a committee thereof) as may be necessary to cause the
Employee Share Purchase Plan referred to in Schedule 4.09B of the Company
Disclosure Schedule and each Stock Acquisition Right (including, without
limitation, unexercised stock options outstanding under the Omnibus Stock
Plan) to be automatically canceled as of the Effective Time, without any
consideration being delivered or deliverable in exchange therefor.
 
  (b) Prior to the Effective Time, the Company shall take such action
(including, without limitation, the adoption of appropriate resolutions by the
Board of Directors of the Company or a committee thereof) as may be necessary
to:
 
    (i) cause each stock appreciation right then outstanding under any Equity
  Plan (a "SAR") to be automatically converted as of the Effective Time into
  the right to receive a cash payment in an amount (the
 
                                     A-31
<PAGE>
 
  "Spread Amount") equal to the excess, if any, of $12.00 over the base price
  provided for in such SAR unless, in the case of each such SAR, the holder
  thereof, the Company and Newco mutually agree otherwise in writing;
 
    (ii) cause each share of outstanding phantom stock to be automatically
  converted as of the Effective Time into the right to receive a cash payment
  in the amount of $12 (the "Phantom Stock Amount"); and
 
    (iii) cause the rights of Gary Hysop under the Hysop Agreement to be
  terminated in exchange for a payment in an amount not to exceed $50,000.
 
As of the Effective Time, the Company shall pay or cause to be paid the Spread
Amounts to the holders of the SARs and the Phantom Stock Amounts to the
holders of phantom stock, net of any amount of Taxes required to be withheld
by applicable Law. No interest shall accrue or be payable with respect to any
Spread Amount or Phantom Stock Amount.
 
  (c) The Company represents and warrants to Newco that the Spread Amounts and
the Phantom Stock Amounts will not in the aggregate exceed an amount equal to
the Maximum Amount. The Company further represents and warrants to Newco that,
upon taking of the actions specified paragraphs (a) and (b) above, immediately
following the Effective Time, (i) no Stock Acquisition Rights or any stock
appreciation rights or phantom stock relating to the Company or any of the
Subsidiaries shall be outstanding and (ii) no participant in the Omnibus Stock
Plan or any other Equity Plan shall have the right thereunder to acquire any
Stock Acquisition Rights or any such stock appreciation rights or phantom
stock. For purposes of this Agreement, "Maximum Amount" means (i) at any time
prior to September 1, 1996, $15,000,000, and (ii) at any time on or after
September 1, 1996, $16,750,000.
 
  (d) Immediately prior to the Effective Time, the Company shall take such
action (including, without limitation, the adoption of appropriate resolutions
by the Board of Directors of the Company or a committee thereof) as may be
necessary to cause all outstanding shares of restricted stock issued under the
Omnibus Plan ("Restricted Stock") to be immediately and fully vested,
notwithstanding any provision of the Omnibus Plan or any agreement between the
Company and any holder of Restricted Stock to the contrary.
 
  (e) Except as otherwise agreed to by the Parties, (i) each Equity Plan shall
terminate as of the Effective Time and (ii) the Company shall ensure that
following the Effective Time no Stock Acquisition Right or any stock
appreciation right or phantom stock relating to the Company or any of the
Subsidiaries shall be outstanding and that no participant in the Omnibus Stock
Plan or any other Equity Plan shall have any right thereunder to acquire any
Stock Acquisition Right or any such stock appreciation right or phantom stock.
 
  Section 7.07. Financing Arrangements. (a) Newco represents and warrants to
the Company that (i) Newco has, contemporaneously with its execution hereof
under cover letter identifying the same as such, delivered to the Company true
and complete copies of letters (the "Financing Letters") from certain
commercial banks, investment banks and other financing sources describing
their interests in participating in the financing (debt and equity) required
by Newco to consummate the Merger in accordance with this Agreement (the
"Financing") and (ii) as of the date hereof, none of the Financing Letters has
been withdrawn or terminated nor is Newco aware of any plan or intention to
withdraw or terminate any of the Financing Letters. Newco will promptly advise
the Company if any Financing Letter is withdrawn or terminated.
 
  (b) Newco further covenants and agrees with the Company that it will use its
reasonable best efforts to obtain the Financing by the Outside Date on terms
and conditions which are reasonably satisfactory to Newco. Newco will promptly
advise the Company if Newco becomes aware of the occurrence of any event which
Newco believes may have a materially adverse effect on the ability of Newco to
obtain the Financing as contemplated by the preceding sentence.
 
  (c) Newco will use its reasonable best efforts to negotiate and enter into,
on or before June 24, 1996, definitive loan agreements or other similar
documents establishing the bank credit facilities contemplated by the
 
                                     A-32
<PAGE>
 
Financing Letters (collectively, the "Definitive Bank Loan Documents"). Newco
will provide the Company with true and complete copies of the Definitive Bank
Loan Documents promptly upon the execution and delivery thereof and will
promptly advise the Company if any of the Definitive Bank Loan Documents are
terminated or amended in any material respect or if Newco becomes aware of any
event or occurrence which Newco believes may have a material adverse effect on
the ability of Newco or the Company to satisfy, on or prior to the Outside
Date, the conditions set forth in the Definitive Bank Loan Documents for
funding thereunder. Newco will consult with the Company regarding such funding
conditions prior to the execution and delivery of the Definitive Bank Loan
Documents. Newco will not modify or amend in any material respect the
Definitive Bank Loan Documents without first consulting with the Company.
Newco agrees that, insofar as they impose obligations on the Company prior to
the Effective Time, the Definitive Bank Loan Documents shall be reasonably
acceptable to the Company.
 
  (d) Newco will use its reasonable best efforts to negotiate and enter into,
within 30 days after the Company has filed with the SEC a preliminary Proxy
Statement, definitive subscription agreements in substantially the form
customarily used in transactions sponsored by The Sterling Group, Inc.
(collectively, the "Definitive Equity Documents") containing commitments from
financial sources to provide that portion of the equity financing contemplated
by the Financing Letters equal to $96,574,952. Newco will provide the Company
with true and complete copies of the Definitive Equity Documents promptly upon
the execution and delivery thereof. Newco will not modify or amend in any
material respect the Definitive Equity Documents without first consulting with
the Company.
 
  (e) The Company will, and will cause each of the Subsidiaries to, take all
reasonable actions reasonably requested by Newco to obtain, and otherwise
cooperate with Newco in obtaining, the Financing. Without limitation of the
foregoing but subject to Section 7.02(b), the Company shall, and shall cause
the Subsidiaries, to (i) afford Newco and Newco's lenders, underwriters,
placement agents, financial advisors, stockholders, attorneys, accountants and
other representatives such access to its officers, directors, employees,
agents, attorneys, accountants, assets, books and records as Newco may
reasonably request in connection with the Financing, (ii) furnish, or cause to
be furnished, to Newco and Newco's lenders, underwriters, placement agents,
financial advisors, stockholders, attorneys, accountants and other
representatives all financial, operating and other data and information,
opinions of counsel and "comfort letters" as Newco may reasonably request in
connection with the Financing, (iii) provide reasonable assistance to Newco to
satisfy, at or before the Outside Date, all requirements of the Definitive
Bank Loan Documents and the Definitive Equity Documents which are conditions
to funding thereunder and (iv) participate, to the extent reasonably requested
by Newco, in customary marketing efforts to obtain the participation of
financial institutions in any syndication of the credit facilities
contemplated by the Financing and to sell the securities contemplated by the
Financing, including road shows, meetings with bankers and similar activities.
 
  Section 7.08. Fees and Expenses. Except as otherwise provided herein, all
fees and expenses incurred in connection with the Merger, this Agreement and
the transactions contemplated by this Agreement shall be paid by the Party
incurring such fees or expenses, whether or not the Merger is consummated.
 
  Section 7.09. Indemnification; Insurance. (a) From and after the Effective
Time, the Surviving Corporation shall indemnify and hold harmless each Person
who is, or has been at any time prior to the date hereof or who becomes prior
to the Effective Time, an officer, director or employee of the Company or any
of the Subsidiaries (collectively, the "Indemnified Parties") against all
Claims, Losses or Liabilities in connection with any Claim based in whole or
in part on the fact that such Indemnified Party is or was a director, officer
or employee of the Company or any of the Subsidiaries and arising out of the
acts or omissions occurring prior to and including the Effective Time
(including but not limited to the transactions contemplated by this Agreement)
to the fullest extent permitted by the DGCL.
 
  (b) Newco shall, subject to obtaining any approvals required to be obtained
from the Company or its stockholders, cause the Certificate of Incorporation
and By-laws of the Surviving Corporation and the Subsidiaries to include
provisions for the limitation of liability of directors and indemnification of
the
 
                                     A-33
<PAGE>
 
Indemnified Parties to the fullest extent permitted under applicable Law and
shall not permit the amendment of such provisions in any manner adverse to the
Indemnified Parties, as the case may be, without the prior written consent of
such Persons, for a period of six years from and after the Effective Time.
 
  (c) Without limitation of the foregoing, in the event any such Indemnified
Party is or becomes involved, during the six-year period after the Effective
Time, in any capacity in any action, proceeding or investigation in connection
with any matter, including, without limitation, the transactions contemplated
by this Agreement, arising out of events occurring prior to, and including,
the Effective Time, the Surviving Corporation will pay as incurred such
Indemnified Party's reasonable legal and other expenses (including the cost of
any investigation and preparation) incurred in connection therewith. The
Surviving Corporation shall pay all reasonable expenses, including attorneys'
fees, that may be incurred by any Indemnified Party in enforcing the indemnity
and other obligations provided for in this Section 7.09.
 
  (d) For a period of no less than six years after the Effective Time, the
Surviving Corporation shall cause to be maintained, with respect to matters
arising out of events occurring prior to the Effective Time, the current
policies of directors' and officers' liability insurance maintained by the
Company or, if not available, an equivalent policy or policies for all present
and former officers and directors of the Company and the Subsidiaries having
terms and conditions no less advantageous than those in effect on the date
hereof.
 
  (e) Any determination to be made as to whether any Indemnified Party has met
any standard of conduct imposed by Law shall be made by legal counsel
reasonably acceptable to such Indemnified Party and the Surviving Corporation,
retained at the Surviving Corporation's expense.
 
  (f) This Section 7.09 is intended to benefit the Indemnified Parties and
their respective heirs, executors and personal representatives and shall be
binding on the successors and assigns of the Surviving Corporation.
 
  Section 7.10. Certain Litigation. Except in the ordinary course of business
or as set forth in the Company Disclosure Schedule, the Company agrees that it
will not settle any material litigation currently pending, or commenced after
the date hereof, against the Company or any of its directors, without the
prior written consent of Newco, which consent shall not be unreasonably
withheld.
 
  Section 7.11. Employee Matters. The Surviving Corporation shall provide
those employees of the Company and the Subsidiaries who continue their
employment after the Effective Time with benefits (including participation in
an employee stock ownership plan) which, in the good faith determination of
the Surviving Corporation, are substantially as favorable in the aggregate as
those currently provided by the Company, subject to such modification as may
be required by applicable Law, for a period of at least two years after the
Closing Date.
 
  Section 7.12. Operating Subsidiary. As soon as practicable after the
execution of this Agreement, Newco shall form a new Delaware corporate
subsidiary ("Operating Sub"). On or prior to the Closing Date, the Company
shall execute and deliver to Operating Sub conveyance documents, in form and
substance reasonably satisfactory to Newco, providing for the conveyance of
all of the assets and properties of the Company to the Operating Sub (a)
subject to all related Liens and Liabilities, (b) conditioned upon the
consummation of the Merger and (c) effective as of the Effective Time;
provided, however, that the conveyance documents shall in any event provide
(i) that Operating Sub, in connection with, and as partial consideration for,
such conveyance, expressly assumes and agrees to pay, perform and discharge
when due, any and all Liabilities of the Company related to such assets and
properties and (ii) that, if the conveyance of any of such asset or
properties:
 
    (A) would be ineffective as between the Company and Operating Sub without
  the consent of any third Person;
 
    (B) would serve as a cause for terminating, invalidating or materially
  impairing such asset or property;
 
    (C) would cause or serve as a cause for the loss of the ownership of such
  asset or property;
 
                                     A-34
<PAGE>
 
    (D) would result in any material penalty or other detriment to the
  Company or Operating Sub; or
 
    (E) is prohibited by Law or any judgment, order or decree of any
  Governmental Authority,
 
then, in such event, such asset or property shall be excluded from such
conveyance until such time as such consent has been obtained or such
circumstance has been rectified, at which time the title to such asset or
property shall automatically become vested in Operating Sub by virtue of such
conveyance without any other conveyance or other action by the Company or
Operating Sub. In addition, such conveyance documents shall provide that, at
any time during which any of such assets or properties is excluded from such
conveyance pursuant to the immediately preceding sentence, the Company or the
Surviving Corporation, as the case may be, shall hold such asset or property
for the exclusive use and benefit of Operating Sub and shall use its
reasonable best efforts, at its sole cost and expense, to obtain such consents
as are necessary to give effect to the conveyance of such asset or property,
or rights and interests substantially equivalent to such asset or property, to
Operating Sub.
 
                                 ARTICLE VIII
 
                                  CONDITIONS
 
  Section 8.01. Conditions to Each Party's Obligation to Effect the Merger.
The respective obligations of each Party to effect the Merger shall be subject
to the fulfillment at or prior to the Closing Date of the following
conditions:
 
    (a) Stockholder Approval. The Company Stockholder Approval shall have
  been obtained.
 
    (b) No Injunctions or Restraints. No statute, rule, regulation or
  executive order shall have been enacted or issued by a Governmental
  Authority, and no decree, temporary restraining order, preliminary or
  permanent injunction or other order issued by any court of competent
  jurisdiction or other Governmental Authority, and no other legal restraint
  or prohibition preventing the consummation of the Merger or making the
  consummation of the Merger illegal shall be in effect; provided, however,
  that each of the Parties shall have used reasonable efforts to prevent the
  entry of any such injunction or other order or decree and to appeal as
  promptly as possible any injunction or other order or decree that may be
  entered.
 
    (c) Waiting Period. Any waiting period applicable to the consummation of
  the Merger under the HSR Act shall have terminated or expired.
 
    (d) Registration Statements. Each of the Registration Statements shall
  have become effective in accordance with the provisions of the Securities
  Act and no stop order suspending such effectiveness shall have been issued
  and remain in effect and no proceeding for that purpose shall have been
  instituted by the SEC or any state Governmental Authorities.
 
    (e) Governmental Consents. All Governmental Approvals legally required
  for the consummation of the Merger and the transactions contemplated hereby
  shall have been obtained and be in effect on the Closing Date.
 
  Section 8.02. Conditions to Obligation of the Company to Effect the Merger.
Unless waived in writing by the Company, the obligation of the Company to
effect the Merger shall be subject to the fulfillment at or prior to the
Closing Date of the following additional conditions:
 
    (a) Accuracy of Representations and Warranties. All representations and
  warranties of Newco contained in Article V of this Agreement shall be true
  and correct in all material respects on and as of the date hereof and on
  and as of the Closing Date, with the same force and effect as though made
  on and as of the Closing Date, except for any representations and
  warranties made as of a specified date, which shall be true and correct in
  all material respects as of the specified date.
 
    (b) Performance of Obligations. Newco shall have performed or complied
  with, in all material respects, all conditions and all material
  obligations, agreements and covenants contained herein which are to be
  performed or complied with by it on or prior to the Closing Date.
 
                                     A-35
<PAGE>
 
    (c) Compliance Certificate. The Company shall have received a certificate
  of the Chairman of the Board, the President or a Vice President of Newco
  certifying as to fulfillment of the conditions specified in Section 8.02(a)
  and (b).
 
    (d) Tag-Along Agreement. The stockholders of Newco immediately prior to
  the Effective Time shall have executed and delivered a Tag-Along Agreement
  in substantially the form of Exhibit A.
 
    (e) Legal Opinion. The Company shall have received an opinion or opinions
  of Andrews & Kurth L.L.P. and/or Richards, Layton & Finger, counsel for
  Newco, reasonably satisfactory to the Company, dated the Closing Date and
  covering the due incorporation of Newco, the binding nature of this
  Agreement, the effectiveness of the Merger and such other matters as may be
  reasonably requested by the Company.
 
  Section 8.03. Conditions to Obligations of Newco to Effect the Merger.
Unless waived in writing by Newco, the obligation of Newco to effect the
Merger shall be subject to the fulfillment at or prior to the Closing Date of
the additional following conditions:
 
    (a) Accuracy of Representations and Warranties. All representations and
  warranties of the Company contained in Article IV of this Agreement shall
  be true and correct in all material respects on and as of the date hereof
  and on and as of the Closing Date, with the same force and effect as though
  made on and as of the Closing Date, except for any representations and
  warranties made as of a specified date, which shall be true and correct in
  all material respects as of the specified date.
 
    (b) Performance of Obligations. The Company shall have performed or
  complied with, in all material respects, all conditions and material
  obligations, agreements and covenants contained herein which are to be
  performed or complied with by it on or prior to the Closing Date.
 
    (c) Compliance Certificate. Newco shall have received a certificate of
  the Chairman of the Board, the President or a Vice President of the Company
  certifying as to fulfillment of the conditions specified in Section 8.03(a)
  and (b).
 
    (d) Legal Opinion. Newco shall have received an opinion or opinions of
  Piper & Marbury L.L.P. and/or F. Maxwell Evans, counsel for the Company,
  reasonably satisfactory to Newco, dated the Closing Date and covering the
  due incorporation of the Company, the binding nature of this Agreement, the
  effectiveness of the Merger, the validity of the Company Common Stock to be
  exchanged in the Merger and such other matters as may be reasonably
  requested by Newco.
 
    (e) Comfort Letters. Newco shall have received "comfort" letters in
  customary form from Arthur Anderson L.L.P. and/or Coopers & Lybrand L.L.P.,
  certified public accountants for the Company, dated the effective time of
  each of the Registration Statements and the Closing Date (or such other
  date reasonably acceptable to Newco) with respect to financial statements
  and other information derived from the Company's accounting records with
  respect to the Company and the Subsidiaries included in the Registration
  Statements and any subsequent changes in specified balance sheet and income
  statement items, including total assets, working capital, total
  stockholders' equity and total revenues and the total and per share amounts
  of net income.
 
    (f) No Material Adverse Change. Since the date hereof, there shall have
  been no changes that constitute, and no event or events (including, without
  limitation, litigation developments) shall have occurred which have
  resulted in or constitute, a material adverse change in (i) the business,
  operations, properties, assets, condition (financial or other) or results
  of operations of the Company and the Subsidiaries, taken as a whole or (ii)
  the prospects of the Company and the Subsidiaries, taken as a whole
  (excluding any effects on such prospects caused by economic, tax or other
  matters of general applicability or matters generally affecting any of the
  industries in which the Company or any of the Subsidiaries conduct
  business).
 
    (g) Financing. Newco shall have obtained the Financing as contemplated by
  Section 7.07.
 
    (h) Stock Acquisition Rights and SARs. The Company shall have received
  (i) from each holder of a stock option referred to in Section 7.06(a) an
  instrument in writing (reasonably satisfactory to Newco)
 
                                     A-36
<PAGE>
 
  effectively canceling such Stock Acquisition Right as contemplated by
  Section 7.06(a), (ii) from each holder of an SAR an instrument in writing
  (reasonably satisfactory to Newco) effectively canceling, subject to
  receiving the Spread Amount, such SAR as contemplated by Section
  7.06(b)(i), (iii) from each holder of any phantom share an instrument in
  writing (reasonably acceptable to Newco) effectively canceling, subject to
  receiving the Phantom Stock Amount, such phantom share as contemplated by
  Section 7.06(b)(ii), and (iv) from the Company and Gary Hysop, an
  instrument in writing (reasonably acceptable to Newco) effectively
  canceling, subject to receiving the amount referred to in Section
  7.06(b)(iii), the Hysop Agreement.
 
                                  ARTICLE IX
 
                           TERMINATION AND AMENDMENT
 
  Section 9.01. Termination. This Agreement may be terminated as set forth
below at any time prior to the Closing Date, whether before or after the
Company Stockholder Approval or the Newco Stockholder Approval has been
obtained:
 
    (a) by mutual written consent of Newco and the Company;
 
    (b) by Newco, if
 
      (i) the Company Stockholder Approval is not obtained at the
    Stockholders Meeting (or any adjournment thereof) unless due to delay
    or default on the part of Newco;
 
      (ii) the Merger has not been consummated by the Outside Date, unless
    the failure to so consummate the Merger by such time is due to a breach
    of any representation or warranty contained in this Agreement or a
    material breach of any material agreement or covenant contained in this
    Agreement by, or otherwise on account of material delay or default on
    the part of, Newco;
 
      (iii) the Merger is enjoined by a final, non-appealable court order
    not entered at the request or with the support of Newco and Newco shall
    have used reasonable efforts to prevent the entry of such order;
 
      (iv) the Company accepts a Takeover Proposal in accordance with
    Section 6.02(b);
 
      (v) the Company (A) fails to perform in any material respect any of
    its material covenants in this Agreement and (B) does not cure such
    default in all material respects within 30 days after notice of such
    default is given to the Company by Newco;
 
      (vi) the Company shall have breached any of its representations and
    warranties set forth in this Agreement, which breach cannot be cured
    prior to the Outside Date and has not been waived by Newco; or
 
      (vii) more than 10% of the issued and outstanding shares of Company
    Common Stock entitled to vote upon the adoption of this Agreement shall
    have properly demanded (and not withdrawn) appraisal of such shares in
    accordance with Section 262 of the DGCL with respect to the Merger; or
 
    (c) by the Company, if:
 
      (i) the Company Stockholder Approval is not obtained at the
    Stockholders Meeting (or any adjournment thereof) unless due to delay
    or default on the part of the Company or any Subsidiary;
 
      (ii) by August 31, 1996, Newco has not arranged the Financing as
    contemplated by Section 7.07(b) and satisfied the funding conditions
    with respect thereto (other than the conditions which are to be
    performed or satisfied by the Company or any Subsidiary) unless the
    failure to so arrange the Financing or satisfy such funding conditions
    by such date is due to a breach of any representation or warranty
    contained in this Agreement or a material breach of any material
    agreement or covenant contained in this Agreement by, or otherwise on
    account of material delay or default on the part of, the
 
                                     A-37
<PAGE>
 
    Company or any Subsidiary; provided, however, that the Company may
    terminate this Agreement pursuant to this clause (ii) only if the
    Company provides Newco with written notice of its election to terminate
    this Agreement pursuant to this clause (ii), which notice by the
    Company must be given by the close of business on the seventh Business
    Day following the later to occur of (A) August 31, 1996 or (B) the
    giving of notice by Newco to the Company of the Company's right to
    terminate this Agreement pursuant to this clause (ii), and then only if
    (1) the giving of such notice by the Company has been approved by the
    Board of Directors of the Company and (2) such notice by the Company
    states that the Company is entitled to terminate this Agreement
    pursuant to this clause (ii);
 
      (iii) the Merger has not been consummated by the Outside Date, unless
    the failure to so consummate the Merger by such time is due to a breach
    of any representation or warranty contained in this Agreement or a
    material breach of any material agreement or covenant contained in this
    Agreement by, or otherwise on account of material delay or default on
    the part of, the Company or any Subsidiary;
 
      (iv) the Merger is enjoined by a final, non-appealable court order
    not entered at the request or with the support of the Company or any
    Subsidiary and the Company shall have used reasonable efforts to
    prevent the entry of such order;
 
      (v) the Company accepts a Takeover Proposal in accordance with
    Section 6.02(b);
 
      (vi) Newco (A) fails to perform in any material respect any of its
    material covenants in this Agreement and (B) does not cure such default
    in all material respects within 30 days after notice of such default is
    given to Newco by the Company;
 
      (vii) Newco shall have breached any of its representations and
    warranties set forth in this Agreement, which breach cannot be cured
    prior to the Outside Date and has not been waived by the Company;
 
      (viii) Newco notifies the Company, pursuant to Section 7.07(b), that
    Newco does not believe it will be able to arrange the Financing by the
    Outside Date for reasons other than a delay or default by the Company
    or any Subsidiary;
 
      (ix) Newco fails to enter into the Definitive Bank Loan Documents on
    or before June 24, 1996 as contemplated by Section 7.07(c) unless such
    failure is due (in whole or in part) to a delay or default on the part
    of the Company or any of the Subsidiaries or to the material breach of
    any of the Company's representations or warranties contained herein;
    provided, however, that the Company may terminate this Agreement
    pursuant to this clause (ix) only if the Company provides Newco with
    written notice of its election to terminate this Agreement pursuant to
    this clause (ix), which notice by the Company must be given by the
    close of business on the seventh Business Day following the later to
    occur of (A) the date by which the Definitive Bank Loan Documents were
    contemplated to be executed pursuant to Section 7.07(c) or (B) the
    giving of notice by Newco to the Company of the Company's right to
    terminate this Agreement pursuant to this clause (ix), and then only if
    (1) the giving of such notice by the Company has been approved by the
    Board of Directors of the Company and (2) such notice by the Company
    states that the Company is entitled to terminate this Agreement
    pursuant to this clause (ix); or
 
      (x) (A) any Definitive Bank Loan Document is terminated (other than
    by Newco) prior to the Outside Date for any reason other than a delay
    or default on the part of the Company or any of the Subsidiaries or the
    material breach of any of the Company's representations or warranties
    contained herein and (B) Newco fails, for any reason other than a delay
    or default on the part of the Company or any of the Subsidiaries or the
    material breach of any of the Company's representations or warranties
    contained herein, to provide one or more substitute or replacement
    Definitive Bank Loan Documents within 15 days after the date of such
    termination; provided, however, that this clause (x) shall not apply to
    the termination of any Definitive Bank Loan Agreement which is not
    necessary in order for Newco to obtain the Financing by the Outside
    Date as contemplated by the first sentence of Section 7.07(b);
 
                                     A-38
<PAGE>
 
      (xi) Newco fails to enter into the Definitive Equity Documents on or
    before the date contemplated in Section 7.07(d) unless such failure is
    due (in whole or in part) to a delay or default on the part of the
    Company or any of the Subsidiaries or to the material breach of any of
    the Company's representations or warranties contained herein; provided,
    however, that the Company may terminate this Agreement pursuant to this
    clause (x) only if the Company provides Newco with written notice of
    its election to terminate this Agreement pursuant to this clause (x),
    which notice by the Company must be given by the close of business on
    the seventh Business Day following the later to occur of (A) the date
    by which the Definitive Equity Documents were contemplated to be
    executed pursuant to Section 7.07(d) or (B) the giving of notice by
    Newco to the Company of the Company's right to terminate this Agreement
    pursuant to this clause (x), and then only if (1) the giving of such
    notice by the Company has been approved by the Board of Directors of
    the Company and (2) such notice by the Company states that the Company
    is entitled to terminate this Agreement pursuant to this clause (x); or
 
      (xii) (A) any Definitive Equity Document is terminated (other than by
    Newco) prior to the Outside Date for any reason other than a delay or
    default on the part of the Company or any of the Subsidiaries or the
    material breach of any of the Company's representations or warranties
    contained herein and (B) Newco fails, for any reason other than a delay
    or default on the part of the Company or any of the Subsidiaries or the
    material breach of any of the Company's representations or warranties
    contained herein, to provide one or more substitute or replacement
    Definitive Equity Documents within 15 days after the date of such
    termination; provided, however, that this clause (xii) shall not apply
    to the termination of any Definitive Equity Document which is not
    necessary in order for Newco to obtain the Financing by the Outside
    Date as contemplated by the first sentence of Section 7.07(b).
 
  Section 9.02. Effect of Termination. In the event of termination of this
Agreement by either Newco or the Company, as provided in Section 9.01, this
Agreement shall forthwith become void and there shall be no liability on the
part of Newco or the Company or their respective officers or directors, except
that (a) Section 4.17, Section 5.07, Section 7.08, this Section 9.02 and
Article X shall survive any such termination, (b) Section 7.05 shall survive
any such termination for a period of one year following such termination, (c)
if Newco terminates this Agreement pursuant to Section 9.01(b)(iv) or if the
Company terminates this Agreement pursuant to Section 9.01(c)(v), then the
Company shall promptly pay to Newco or its designee a break-up fee in the
amount of $8,000,000, and (d) if the break-up fee referred to clause (c) above
is payable by the Company to Newco or its designee, Section 6.02(b) shall
survive any such termination until such time as such break-up fee has been
paid by the Company to Newco or its designee; provided, however, that nothing
herein shall relieve either Party for liability for any willful breach of any
representation, warranty, covenant or agreement of such party contained
herein.
 
  Section 9.03. Amendment. This Agreement may be amended by action taken by
the Parties' respective Boards of Directors or pursuant to authority granted
by such Boards of Directors, at any time before or after the Company
Stockholder Approval or the Newco Stockholder Approval has been obtained;
provided, however, that no amendment to this Agreement shall be made after the
Company Stockholder Approval or the Newco Stockholder Approval has been
obtained which by applicable Law requires further approval by the Company's or
Newco's stockholders, respectively, unless such further approval shall have
been obtained in accordance with applicable Law. This Agreement may not be
amended except by an instrument in writing signed on behalf of each of the
Parties.
 
  Section 9.04. Extension; Waiver. At any time prior to the Effective Time,
either Party may, to the extent legally allowed (a) extend the time for the
performance of any of the obligations or other acts of the other Party, (b)
waive any inaccuracies in the representations and warranties contained herein
or in any document delivered pursuant hereto or (c) subject to the proviso of
Section 9.03, waive compliance with any of the agreements or conditions
contained herein. Any agreement on the part of a Party to any such extension
or waiver shall be valid only if set forth in a written instrument signed on
behalf of such Party by one of its duly authorized officers. The failure of
either Party to assert any of its rights under this Agreement or otherwise
shall not constitute a waiver of these rights.
 
                                     A-39
<PAGE>
 
                                   ARTICLE X
 
                                 MISCELLANEOUS
 
  Section 10.01. Nonsurvival of Representations and Warranties. None of the
representations and warranties in this Agreement or in any instrument
delivered pursuant to this Agreement shall survive the Effective Time. This
Section 10.01 shall not limit any covenant or agreement of the Parties which
by its terms contemplates performance after the Effective Time of the Merger,
which covenants or agreements shall survive the consummation of the Merger.
 
  Section 10.02. Notices. All notices and other communications hereunder shall
be in writing and shall be deemed given if delivered personally, telecopied
(which is confirmed) or mailed by registered or certified mail (return receipt
requested) to the Parties at the following addresses (or at such other address
for a Party as shall be specified by like notice):
 
    (a) if to Newco, to:
 
      c/o The Sterling Group, Inc.
      Eight Greenway Plaza, Suite 702
      Houston, Texas 77046
      Attention: Frank J. Hevrdejs
      Telephone Number: (713) 877-8257
      Facsimile Number: (713) 877-1824
 
    with a copy to:
 
      Andrews & Kurth L.L.P.
      4200 Texas Commerce Tower
      600 Travis
      Houston, Texas 77002
      Attention: David G. Elkins
      Telephone Number: (713) 220-4364
      Facsimile Number: (713) 220-4285
 
    (b) if to the Company, to:
 
      Sterling Chemicals, Inc.
      1200 Smith Street
      Suite 1900
      Houston, Texas 77002
      Attention: F. Maxwell Evans, General Counsel
      Telephone Number: (713) 654-9507
      Facsimile Number: (713) 654-9577
 
    with a copy to:
 
      Piper & Marbury L.L.P.
      36 South Charles Street
      Baltimore, Maryland 21201
      Attention: Earl S. Wellschlager
      Telephone Number: (410) 576-1747
      Facsimile Number: (410) 576-1700
 
  Section 10.03. Counterparts. This Agreement may be executed in two or more
counterparts, all of which shall be considered one and the same agreement and
shall become effective when two or more counterparts have been signed by each
of the Parties and delivered to the other Party, it being understood that both
Parties need not sign the same counterpart.
 
                                     A-40
<PAGE>
 
  Section 10.04. Entire Agreement; No Third Party Beneficiaries. This
Agreement (a) constitutes the entire agreement and supersedes all prior
agreements and understandings, both written and oral, between the Parties with
respect to the subject matter hereof and (b) except as provided in Sections
7.06(b), 7.06(d), 7.09 and 7.11, is not intended to confer upon any Person
other than the Parties any rights or remedies hereunder.
 
  Section 10.05. Governing Law. This Agreement shall be governed and construed
in accordance with the laws of the State of Delaware without regard to any
applicable conflicts of law.
 
  Section 10.06. Severability. If any term, provision, covenant or restriction
contained in this Agreement is held by a court of competent jurisdiction or
other authority to be invalid, void, unenforceable or against its regulatory
policy, the remainder of the terms, provisions, covenants and restrictions
contained in this Agreement shall remain in full force and effect and shall in
no way be affected, impaired or invalidated.
 
  Section 10.07. Assignment. Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned by either of the Parties
(whether by operation of Law or otherwise) without the prior written consent
of the other Party. Subject to the preceding sentence, this Agreement will be
binding upon, inure to the benefit of and be enforceable by the Parties and
their respective successors and assigns.
 
  In Witness Whereof, Newco and the Company have caused this Agreement to be
signed by their respective duly authorized officers as of the date first
written above.
 
                                          STX Acquisition Corp.
 
                                          By: /s/ Frank J. Hevrdejs
                                              _________________________________
                                              Frank J. Hevrdejs, President
 
                                          Sterling Chemicals, Inc.
 
                                          By: /s/ J. Virgil Waggoner
                                              _________________________________
                                              J. Virgil Waggoner, President and
                                              Chief Executive Officer
 
                                     A-41
<PAGE>
 
                                   EXHIBIT A
 
                              TAG-ALONG AGREEMENT
 
  This Tag-Along Agreement dated as of             , 1996 is by the
undersigned (the "Obligors") in favor of and for the benefit of the
Beneficiaries (as hereinafter defined).
 
                            PRELIMINARY STATEMENTS
 
1. Effective as of the date hereof, STX Acquisition Corp., a Delaware
   corporation ("Newco"), merged (the "Merger") into Sterling Chemicals, Inc.,
   a Delaware corporation (the "Company"), pursuant to that certain Agreement
   and Plan of Merger between Newco and the Company dated as of April 24, 1996
   (the "Merger Agreement").
 
2. Pursuant to the Merger Agreement, certain of the stockholders of the
   Company retained all or a portion of the shares of common stock, par value
   $0.01 per share, of the Company ("Company Common Stock") held by them
   immediately prior to the Merger rather than have such shares converted into
   cash in connection with the Merger (such retained shares of Company Common
   Stock being herein called the "Rollover Shares").
 
3. Pursuant to the Merger Agreement, the outstanding shares of common stock,
   par value $0.01 per share, of Newco ("Newco Common Stock") were converted
   into shares of Company Common Stock. Each of the Obligors (i) was the owner
   of shares of Newco Common Stock and (ii) as a result of the conversion of
   those shares into Company Common Stock as aforesaid, is now the owner of
   the number of shares of Company Common Stock set forth below such Obligor's
   name on the signature pages hereof.
 
4. This Agreement is being entered into pursuant to Section 8.02(d) of the
   Merger Agreement.
 
  NOW, THEREFORE, in consideration of the premises and the covenants contained
herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, each Obligor, severally with
respect to itself only, hereby agrees as follows:
 
                                   ARTICLE I
 
                        DEFINITIONS AND INTERPRETATION
 
  Section 1.01. Certain Defined Terms. Capitalized terms used in this
Agreement shall have the following respective meanings, except as otherwise
provided herein or as the context shall otherwise require:
 
    "Affiliate" means, with respect to any Person, any other Person that,
  directly or indirectly, through one or more intermediaries, controls, is
  controlled by or is under common control with such Person. The term
  "control" (including, with correlative meaning, the terms "controlling",
  "controlled by" and "under common control with") means the possession,
  directly or indirectly, of the power to direct or cause direction of the
  management and policies of a Person, whether through the ownership of
  voting securities, by contract or otherwise.
 
    "Agreement" means this Tag-Along Agreement, as the same may hereafter be
  amended, modified or restated and in effect from time to time.
 
    "Beneficiaries" means each Person (other than any Obligor) who retained
  Rollover Shares in connection with the Merger, including such Person's
  permitted assigns.
 
    "Company" has the meaning specified in the Preliminary Statements of this
  Agreement.
 
    "Company Common Stock" has the meaning specified in the Preliminary
  Statements of this Agreement.
 
    "Disputants" has the meaning specified in Section 4.02(a).
 
                                     A-42
<PAGE>
 
    "Maximum Amount" has the meaning specified in Section 2.01(b).
 
    "Merger" has the meaning specified in the Preliminary Statements of this
  Agreement.
 
    "Merger Agreement" has the meaning specified in the Preliminary
  Statements of this Agreement.
 
    "Newco" has the meaning specified in the Preliminary Statements of this
  Agreement.
 
    "Newco Common Stock" has the meaning specified in the Preliminary
  Statements of this Agreement.
 
    "Obligors" has the meaning specified in the introductory paragraph of
  this Agreement.
 
    "Participating Beneficiary" has the meaning specified in Section 2.01(d).
 
    "Person" means any individual, firm, corporation, trust, association,
  company, limited liability company, joint stock company, partnership, joint
  venture, governmental authority or other entity or enterprise.
 
    "Proposed Transaction" has the meaning specified in Section 2.01(a).
 
    "Purchaser" has the meaning specified in Section 2.01(b).
 
    "Restricted Shares" means the shares of Company Common Stock into which
  the shares of Newco Common Stock owned by the Obligors have been converted
  pursuant to the Merger.
 
    "Rollover Shares" has the meaning specified in the Preliminary Statements
  of this Agreement.
 
    "Sellers" has the meaning specified in Section 2.01(a).
 
    "Tag-Along Notice" has the meaning specified in Section 2.01(c).
 
    "Transfer" means, with respect to the Restricted Shares of any Obligor,
  any direct or indirect sale, assignment or other disposition of such
  Restricted Shares by such Obligor; provided, however, that such term shall
  not include any sale, assignment or other disposition by such Obligor:
 
      (a) to one or more other Obligors or to the Company;
 
      (b) to any Affiliate of such Obligor;
 
      (c) if such Obligor is a natural person, to (i) a guardian of the
    estate of such Obligor or (ii) an inter vivos trust primarily for the
    benefit of such Obligor and/or such Obligor's immediate family;
 
      (d) if such Obligor is a natural person, to an executor,
    administrator or guardian of the estate of such Obligor or to the
    heirs, distributees or legatees of such Obligor under the will of such
    Obligor or pursuant to the laws of descent and distribution;
 
      (e) to a Person who acquires such Restricted Shares by operation of
    law (including pursuant to a property settlement agreement, plan or
    arrangement approved or ordered by any court);
 
      (f) pursuant to a gift or charitable contribution;
 
      (g) pursuant to a public distribution registered under the Securities
    Act of 1933, as amended (the "Securities Act"), or a sale on the open
    market through a "brokers' transaction (as that term is defined in
    subsection (g) of Rule 144 promulgated under the Securities Act);
 
      (h) pursuant to Rule 144 promulgated under the Securities Act;
 
      (i) pursuant to a mortgage, pledge or other encumbrance;
 
      (j) pursuant to bankruptcy or insolvency proceedings or any judicial
    order, legal process, execution or attachment;
 
      (k) pursuant to a tender or exchange offer or a merger, consolidation
    or other similar transaction open to all stockholders of the Company on
    a pro rata basis at the same price per share and on the same economic
    terms; or
 
                                     A-43
<PAGE>
 
      (l) if shares of Company Common Stock are listed on any national
    securities exchange or reported on The Nasdaq Stock Market, in a
    transaction where the purchase price per Restricted Share being
    transferred is less than or equal to the then-current market price per
    share.
 
    "Transfer Notice" has the meaning specified in Section 2.01(a).
 
  Section 1.02. Interpretation. In this Agreement, unless a clear contrary
intention appears:
 
    (a) the words "hereof," "herein" and "hereunder" and words of similar
  import refer to this Agreement as a whole and not to any particular
  provision of this Agreement;
 
    (b) reference to any gender includes each other gender and the neuter;
 
    (c) all terms defined in the singular shall have the same meanings in the
  plural and vice versa;
 
    (d) reference to any Person includes such Person's heirs, executors,
  personal representatives, administrators, successors and assigns; provided,
  however, that nothing contained in this clause (d) is intended to authorize
  any assignment not otherwise permitted by this Agreement;
 
    (e) reference to a Person in a particular capacity excludes such Person
  in any other capacity or individually;
 
    (f) all references to Articles and Sections shall be deemed to be
  references to the Articles and Sections of this Agreement;
 
    (g) the word "including" (and with correlative meaning "include") means
  including, without limiting the generality of any description preceding
  such term;
 
    (h) with respect to the determination of any period of time, the word
  "from" means "from and including" and the words "to" and "until" each means
  "to but excluding";
 
    (i) the captions and headings contained in this Agreement shall not be
  considered or given any effect in construing the provisions hereof if any
  question of intent should arise;
 
    (j) where any provision of this Agreement refers to action to be taken by
  any Person, or which such Person is prohibited from taking, such provision
  shall be applicable whether such action is taken directly or indirectly by
  such Person; and
 
    (k) no provision of this Agreement shall be interpreted or construed
  against any Person solely because that Person or its legal representative
  drafted such provision.
 
                                  ARTICLE II
 
                               TAG-ALONG RIGHTS
 
  Section 2.01. Tag-Along Rights. (a) In the event that, at any time during
the term of this Agreement, any Obligor acting alone or two or more of the
Obligors acting in concert (the "Sellers", whether one or more) propose to
Transfer, in a single transaction or series of related transactions,
Restricted Shares representing in the aggregate 51% or more of all of the
shares of Company Common Stock then issued and outstanding (on a fully-diluted
basis), the Sellers shall give, or cause to be given, written notice (a
"Transfer Notice") to the Beneficiaries of such proposed Transfer (a "Proposed
Transaction"). For purposes of this Agreement, two or more Obligors will be
deemed to be acting in concert when they act jointly or on a coordinated basis
pursuant to any express or tacit agreement, arrangement or understanding.
 
  (b) Each Transfer Notice shall (i) specify the total number of Restricted
Shares proposed to be disposed of in the Proposed Transaction (the "Maximum
Amount"), (ii) specify the proposed purchase price for such Restricted Shares,
(iii) describe the portion of such purchase price payable at the closing of
such Proposed Transaction, (iv) describe the amount and any terms of any
delayed payment of such purchase price, (v) describe
 
                                     A-44
<PAGE>
 
the security (if any) for any such deferred payment and (vi) identify the
prospective purchaser of the Restricted Shares proposed to be disposed of in
the Proposed Transaction (the "Purchaser").
 
  (c) Each Beneficiary shall have the right to participate in the Proposed
Transaction described in a Transfer Notice on a pro rata basis and at the same
price per share and on the same economic terms and conditions applicable to
the Sellers, but only if such Beneficiary gives the Sellers written notice of
such Beneficiary's desire to so participate within 15 days after receipt of
the applicable Transfer Notice by such Beneficiary (a "Tag-Along Notice"). The
failure of any Beneficiary to provide the Sellers with a Tag-Along Notice
within such 15-day period shall be deemed for all purposes of this Agreement
to be an irrevocable election by such Beneficiary to not participate in the
relevant Proposed Transaction. Each Tag-Along Notice shall (A) specify the
number of Rollover Shares owned by the relevant Beneficiary which such
Beneficiary desires to include in relevant Proposed Transaction (the
"Participating Shares"), (B) contain an irrevocable agreement of such
Beneficiary to sell the Participating Shares to the Purchaser pursuant to the
terms of the Transfer Notice and this Agreement and (C) contain a
representation of such Beneficiary to the effect that the agreement referred
to in the foregoing clause (B) constitutes a legal, valid and binding
obligation of such Beneficiary, enforceable against such Beneficiary in
accordance with its terms.
 
  (d) If any Beneficiary shall have given a Tag-Along notice in accordance
with paragraph (c) above (a "Participating Beneficiary"), the Sellers shall
not Transfer any Restricted Shares to the Purchaser as contemplated by the
relevant Transfer Notice unless each Participating Beneficiary is permitted to
include in the Proposed Transaction, on terms no less favorable than those
applicable to the Sellers, that number of Rollover Shares then owned by such
Participating Beneficiary determined by multiplying (i) the number of
Participating Shares of such Participating Beneficiary by (ii) a fraction
having a numerator equal to the Maximum Amount and a denominator equal to the
total number of Restricted Shares then owned by the Sellers providing such
Transfer Notice.
 
  Section 2.02. Terms of Transfer of Rollover Shares. Any transfer of Rollover
Shares pursuant to Section 2.01 shall be made at the same price per share and
on the same terms and conditions as are set forth in the applicable Transfer
Notice and such transfer shall be closed concurrently with the Transfer to the
Purchaser of the Restricted Shares described in the Transfer Notice.
 
  Section 2.03. Costs and Expenses. All reasonable costs and expenses incurred
in connection with any transfer made pursuant to Section 2.01, including all
costs and disbursements, finders' fees or brokerage commissions and the fees
and disbursements of a single counsel representing all shares of Company
Common Stock to be transferred in connection therewith, shall be allocated pro
rata among the Sellers and the Participating Beneficiaries based on the number
of shares of Company Common Stock sold by each of them.
 
  Section 2.04. Application to Transferees. Any transferee that acquires any
Restricted Shares pursuant to clause (a), (b), (c), (d), (e) or (f) of the
definition herein of Transfer (other than pursuant to a gift or charitable
contribution to non-profit organization exempt under Section 501(c)(3) of the
Internal Revenue Code of 1986, as amended) shall take such Restricted Shares
subject to the terms and conditions of this Agreement. All other transferees
of any Restricted Shares shall take such Restricted Shares free from the terms
of this Agreement.
 
                                  ARTICLE III
 
                                  TERMINATION
 
  Section 3.01. Termination. This Agreement shall terminate with respect to
any Beneficiary in the event that such Beneficiary delivers a Tag-Along Notice
to any Seller and thereafter defaults on its obligation to transfer any
Rollover Shares which such Beneficiary has elected to transfer at the closing
of the Proposed Transaction described in the applicable Transfer Notice. This
Agreement shall automatically terminate with respect to all Beneficiaries on
the fifth anniversary of the date of this Agreement.
 
                                     A-45
<PAGE>
 
  Section 3.02. Effect of Termination. In the event of any termination of this
Agreement, this Agreement shall become void and there shall be no liability on
the part of any Obligor hereunder; provided, however, that nothing herein
shall relieve any Obligor for liability for any willful breach hereof prior to
such termination.
 
                                  ARTICLE IV
 
                                 MISCELLANEOUS
 
  Section 4.01. Notices. Any and all notices, requests or other communications
hereunder shall be given in writing and delivered by: (a) regular, overnight
or registered or certified mail (return receipt requested), with first class
postage prepaid; (b) hand delivery; (c) facsimile transmission; or (d)
overnight courier service, to the Parties at the following addresses or
facsimile numbers:
 
    (i) if to any Obligor, to the address set forth below such Obligor's name
  on the signature pages hereof; and
 
    (ii) if to the Beneficiaries, to the names and addresses of the
  Beneficiaries as they appear on the stock transfer records of the Company,
 
or at such other address or number as shall be designated in a notice by any
Obligor to the Beneficiaries, given in accordance with this Section 4.01.
Except as otherwise provided in this Agreement, all such communications shall
be deemed to have been duly given (A) in the case of a notice sent by regular
mail, three business days after it is duly deposited in the mails, (B) in the
case of a notice sent by registered or certified mail, on the date receipted
for (or refused) on the return receipt, (C) in the case of a notice delivered
by hand, when personally delivered, (D) in the case of a notice sent by
facsimile, upon transmission subject to telephone confirmation of receipt, and
(E) in the case of a notice sent by overnight mail or overnight courier
service, the date delivered at the designated address.
 
  Section 4.02. Dispute Resolution. (a) In the event of any dispute between
the Obligors (or any of them), on the one hand, and any Beneficiaries (or any
of them), on the other hand, with respect to any matter covered by this
Agreement (including whether the provisions of this Agreement have been
complied with), the applicable Obligors and Beneficiaries (the "Disputants")
shall first use their best efforts to resolve such dispute between themselves.
If the Disputants are unable to resolve the dispute within 15 days, such
dispute shall be submitted to mediation in accordance with the Commercial
Mediation Rules of the American Arbitration Association. The Disputants will
jointly appoint a mutually acceptable mediator, seeking assistance in such
regard from the American Arbitration Association if they are unable to agree
upon such appointment within ten days following the 15-day period referred to
above. Upon appointment of the mediator, the Disputants agree to participate
in good faith in the mediation and negotiations relating thereto for 20 days.
If the Disputants are not successful in resolving the dispute through
mediation within such 20-day period, either Disputant may submit the dispute
to arbitration in accordance with the following provisions of this Section
4.02. The fees and expenses of the mediator shall be borne by the non-
prevailing party or, in the event there is no clear prevailing party, as the
mediator deems appropriate.
 
  (b) To submit a dispute to arbitration as contemplated by paragraph (a)
above, a Disputant must give written notice to the other Disputant, in which
event the dispute shall be settled by arbitration in accordance with the
Expedited Procedures of the Commercial Arbitration Rules of the American
Arbitration Association except as otherwise provided below. The arbitrators
shall have sole discretion with regard to the admissibility of evidence. Each
Disputant shall have the right to be represented by counsel. All rulings of
the arbitrators shall be in writing, shall be determined by at least a
majority of their number and shall be delivered to the Disputants. The fees
and expenses of the arbitrators shall be borne by the non-prevailing Disputant
or, in the event there is no clear prevailing Disputant, as the arbitrators
deem appropriate.
 
  (c) In the event there is any disputed question of law involved in any
arbitration proceeding hereunder, such as the proper legal interpretation of
any provision of this Agreement, the arbitrators shall make separate and
 
                                     A-46
<PAGE>
 
distinct findings of all facts material to the disputed question of law to be
decided and, on the basis of the facts so found, express their conclusion of
the question of law. The facts so found shall be conclusive and binding on the
Disputants, but any legal conclusion reached by the arbitrators from such
facts may be submitted by either Disputant to the courts of the State of
Delaware for final determination by initiation of a civil action in the manner
provided by law, and the Obligors and the Beneficiaries hereby consent and
submit themselves to the jurisdiction of such courts for such purpose. Such
action, to be valid, must be commenced within 20 days after receipt of the
arbitrators' decision. If no civil action is commenced within such 20-day
period, the legal conclusion reached by the arbitrators shall be conclusive
and binding on the Disputants. Any such civil action shall be submitted, heard
and determined solely on the basis of the facts found by the arbitrators.
Neither of the Disputants shall, or shall be entitled to, submit any
additional or different facts for consideration by the court. In the event any
civil action is commenced under this paragraph (c), the party who prevails or
substantially prevails (as determined by the court) in such civil action shall
be entitled to recover from the other party all of its fees and expenses,
including reasonable attorney's fees and court costs, incurred in connection
with such action and on appeal.
 
  (d) Except as limited by paragraph (c) above, the Disputants agree that
judgment upon the award rendered by the arbitrators may be entered in any
court of competent jurisdiction, and the Disputants hereby consent and submit
themselves to the jurisdiction of the courts of the State of Delaware for
purposes of the enforcement of any arbitration award. In the event legal
proceedings are commenced to enforce the rights awarded in any arbitration
proceeding hereunder, the party who prevails or substantially prevails (as
determined by the court) in such legal proceeding shall be entitled to recover
from the other party all of its fees and expenses, including reasonable
attorneys' fees and costs of court, incurred in connection with such legal
proceeding and on appeal.
 
  (e) All arbitration and mediation conferences and hearings pursuant to this
Section 4.02 shall be conducted in Wilmington, Delaware or at such other place
as the Disputants may mutually agree.
 
  Section 4.03. Benefit and Burden. This Agreement shall inure to the benefit
of and shall be binding upon, the Obligors and the Beneficiaries and their
respective executors, personal representatives, administrators, successors,
heirs, distributees, devisees, legatees and permitted assigns.
 
  Section 4.04. No Third Party Rights. Nothing in this Agreement shall be
deemed to create any right in any creditor or other Person other than the
Obligors and the Beneficiaries and their respective heirs, executors,
administrators, personal representatives and permitted assigns, and this
Agreement shall not be construed in any respect to be a contract in whole or
in part for the benefit of any other Person.
 
  Section 4.05. Assignments. Neither this Agreement nor any right, interest or
obligation hereunder may be assigned (i) by any Obligor, without the prior
written consent of the Beneficiaries or (ii) by any Beneficiary, except in
connection with the transfer of Rollover Shares to such assignee.
 
  Section 4.06. Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed to be an original but all of which
together shall constitute one and the same document.
 
  Section 4.07. Governing Law. THIS AGREEMENT AND THE RIGHTS OF THE PARTIES
HEREUNDER SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF
THE STATE OF DELAWARE, WITHOUT GIVING EFFECT TO THE CONFLICT OF LAW PRINCIPLES
THEREOF.
 
  Section 4.08. Entire Agreement. This Agreement sets forth all of the
promises, agreements, conditions, understandings, warranties and
representations between the Parties with respect to the subject matter of this
Agreement, and supersedes all prior agreements, arrangements and
understandings between the Parties (whether written, oral or otherwise) with
respect to the subject matter hereof. There are no promises, agreements,
conditions, understandings, warranties or representations, oral or written,
express or implied, between the Parties concerning the subject matter hereof
except as set forth herein.
 
 
                                     A-47
<PAGE>
 
  IN WITNESS WHEREOF, the Obligors have executed this Agreement as of the date
first above written.
 
                                          OBLIGORS:
 
                                          By: _________________________________
                                          Printed Name: _______________________
                                          Title: ______________________________
                                          Number of Restricted Shares: ________
 
                                          Address:
 
                                          _____________________________________
                                          _____________________________________
                                          _____________________________________
                                          Telephone Number: ___________________
                                          Facsimile Number: ___________________
 
                                          _____________________________________
                                          Spouse (if applicable)
 
                                      A-48
<PAGE>
 
                                   EXHIBIT B
 
                     RESTATED CERTIFICATE OF INCORPORATION
 
                                      OF
 
                           STERLING CHEMICALS, INC.
 
                                   ARTICLE I
 
                        NAME, REGISTRATION AND PURPOSE
 
  Section 1.01. Name. The name of the Corporation is "Sterling Chemicals
Holdings, Inc.".
 
  Section 1.02. Registered Office and Registered Agent. The registered office
of the Corporation in the State of Delaware is located at Corporation Trust
Center, 1209 Orange Street in the City of Wilmington, County of New Castle.
The name of the registered agent of the Corporation at such address is The
Corporation Trust Company.
 
  Section 1.03. Purpose. The purpose for which the Corporation is organized is
to engage in any lawful acts and activities for which corporations may be
organized under the General Corporation Law of the State of Delaware ("DGCL"),
and the Corporation shall have the power to perform all lawful acts and
activities.
 
                                  ARTICLE II
 
                                CAPITALIZATION
 
  Section 2.01. Authorized Capital. (a) The total number of shares of stock
that the Corporation shall have the authority to issue is 22,000,000 shares of
capital stock, consisting of (i) 2,000,000 shares of preferred stock, par
value $0.01 per share (the "Preferred Stock"), and (ii) 20,000,000 shares of
common stock, par value $0.01 per share (the "Common Stock").
 
  (b) Subject to the provisions of this Certificate of Incorporation and the
Preferred Stock Designation (as defined below) creating any series of
Preferred Stock, the Corporation may issue shares of its capital stock from
time to time for such consideration (not less than the par value thereof) as
may be fixed by the Board of Directors of the Corporation (the "Board of
Directors"), which is expressly authorized to fix the same in its absolute
discretion subject to the foregoing conditions. Shares so issued for which the
consideration shall have been paid or delivered to the Corporation shall be
deemed fully paid stock and shall not be liable to any further call or
assessment thereon, and the holders of such shares shall not be liable for any
further payments in respect of such shares.
 
  (c) The right to cumulate votes for the election of directors as provided in
Section 214 of the DGCL shall not be granted and is hereby expressly denied.
 
  Section 2.02. Preferred Stock. (a) The Preferred Stock may be issued from
time to time in one or more series. Authority is hereby expressly granted to
and vested in the Board of Directors to authorize from time to time the
issuance of Preferred Stock in one or more series. With respect to each series
of Preferred Stock authorized by it, the Board of Directors shall be
authorized to establish by resolution or resolutions, and by filing a
certificate pursuant to the applicable law of the State of Delaware (a
"Preferred Stock Designation"), the following to the fullest extent now or
hereafter permitted by the DGCL:
 
    (i) the designation of such series;
 
    (ii) the number of shares to constitute such series;
 
                                     A-49
<PAGE>
 
    (iii) whether such series is to have voting rights (full, special or
  limited) or is to be without voting rights;
 
    (iv) if such series is to have voting rights, whether or not such series
  is to be entitled to vote as a separate class either alone or together with
  the holders of the Common Stock or one or more other series of Preferred
  Stock;
 
    (v) the preferences and relative, participating, optional, conversion or
  other special rights (if any) of such series and the qualifications,
  limitations or restrictions (if any) with respect to such series;
 
    (vi) the redemption rights and price(s), if any, of such series, and
  whether or not the shares of such series shall be subject to the operation
  of retirement or sinking funds to be applied to the purchase or redemption
  of such shares for retirement and, if such retirement or sinking funds or
  funds are to be established, the periodic amount thereof and the terms and
  provisions relative to the operation thereof;
 
    (vii) the dividend rights and preferences (if any) of such series,
  including, without limitation, (A) the rates of dividends payable thereon,
  (B) the conditions upon which and the time when such dividends are payable,
  (C) whether or not such dividends shall be cumulative or noncumulative and,
  if cumulative, the date or dates from which such dividends shall accumulate
  and (D) whether or not the payment of such dividends shall be preferred to
  the payment of dividends payable on the Common Stock or any other series of
  Preferred Stock;
 
    (viii) the preferences (if any), and the amounts thereof, which the
  holders of such series shall be entitled to receive upon the voluntary or
  involuntary liquidation, dissolution or winding-up of, or upon any
  distribution of the assets of, the Corporation;
 
    (ix) whether or not the shares of such series, at the option of the
  Corporation or the holders thereof or upon the happening of any specified
  event, shall be convertible into or exchangeable for (A) shares of Common
  Stock, (B) shares of any other series of Preferred Stock or (C) any other
  stock or securities of the Corporation;
 
    (x) if such series is to be convertible or exchangeable, the price or
  prices or ratio or ratios or rate or rates at which such conversion or
  exchange may be made and the terms and conditions (if any) upon which such
  price or prices or ratio or ratios or rate or rates may be adjusted; and
 
    (xi) such other rights, powers and preferences with respect to such
  series as may to the Board of Directors seem advisable.
 
  Any series of Preferred Stock may vary from any other series of Preferred
Stock in any or all of the foregoing respects and in any other manner.
 
  (b) The Board of Directors may, with respect to any existing series of
Preferred Stock but subject to the Preferred Stock Designation creating such
series, increase the number of shares of Preferred Stock designated for such
series by a resolution adding to such series authorized and unissued shares of
Preferred Stock not designated for any other series. The Board of Directors
may, with respect to any existing series of Preferred Stock but subject to the
Preferred Stock Designation creating such series, decrease the number of
shares of Preferred Stock designated for any existing series by a resolution
subtracting from such series shares of Preferred Stock designated for such
series (but not below the number of shares of such series then outstanding),
and the shares so subtracted shall become authorized, unissued and
undesignated shares of Preferred Stock.
 
  (c) No vote of the holders of the Common Stock or the Preferred Stock shall,
unless otherwise expressly provided in a Preferred Stock Designation, be a
prerequisite to the issuance of any shares of any series of the Preferred
Stock authorized by and complying with the conditions of this Certificate of
Incorporation. Shares of any series of Preferred Stock that have been
authorized for issuance pursuant to this Certificate of Incorporation and that
have been issued and reacquired in any manner by the Corporation (including
upon conversion or exchange thereof) shall be restored to the status of
authorized and unissued shares of Preferred Stock and may be reissued as part
of a new series of Preferred Stock to be created by resolution or resolutions
of the Board of Directors and a Preferred Stock Designation as set forth
above.
 
                                     A-50
<PAGE>
 
  Section 2.03. Common Stock. (a) The holders of shares of the Common Stock
shall be entitled to vote upon all matters submitted to a vote of the common
stockholders of the Corporation and shall be entitled to one vote for each
share of the Common Stock held.
 
  (b) Subject to the prior rights and preferences (if any) applicable to
shares of Preferred Stock of any series, the holders of shares of the Common
Stock shall be entitled to receive such dividends (payable in cash, stock or
otherwise) as may be declared thereon by the Board of Directors at any time
and from time to time out of any funds of the Corporation legally available
therefor.
 
  (c) In the event of any voluntary or involuntary liquidation, dissolution or
winding-up of the Corporation, after payment or provision for payment of the
debts and other liabilities of the Corporation, and subject to the
preferential or other rights (if any) of the holders of shares of the
Preferred Stock in respect thereof, the holders of shares of the Common Stock
shall be entitled to receive all the remaining assets of the Corporation
available for distribution to its stockholders, ratably in proportion to the
number of shares of the Common Stock held by them. For purposes of this
paragraph (c), a liquidation, dissolution or winding-up of the Corporation
shall not be deemed to be occasioned by or to include (i) any consolidation or
merger of the Corporation with or into another corporation or other entity or
(ii) a sale, lease, exchange or conveyance of all or a part of the assets of
the Corporation.
 
  Section 2.04. Stock Options, Warrants, etc. Unless otherwise expressly
prohibited in a Preferred Stock Designation creating any series of Preferred
Stock, the Corporation shall have authority to create and issue warrants,
rights and options entitling the holders thereof to purchase from the
Corporation shares of the Corporation's capital stock of any class or series
or other securities of the Corporation for such consideration and to such
persons, firms or corporations as the Board of Directors, in its sole
discretion, may determine, setting aside from the authorized but unissued
stock of the Corporation the requisite number of shares for issuance upon the
exercise of such warrants, rights or options. Such warrants, rights and
options shall be evidenced by one or more instruments approved by the Board of
Directors. The Board of Directors shall be empowered to set the exercise
price, duration, time for exercise and other terms of such warrants, rights or
options; provided, however, that the consideration to be received for any
shares of capital stock subject thereto shall not be less than the par value
thereof.
 
                                  ARTICLE III
 
                                   DIRECTORS
 
  Section 3.01. Number and Term. The number of directors of the Corporation
shall from time to time be fixed exclusively by the Board of Directors in
accordance with, and subject to the limitations set forth in, the bylaws of
the Corporation (the "Bylaws"); provided, however, that the Board of Directors
shall at all times consist of a minimum of three and a maximum of fifteen
members, subject, however, to increases above fifteen members as may required
in order to permit the holders of any series of Preferred Stock to exercise
their right (if any) to elect additional directors under specified
circumstances. No decrease in the number of directors shall have the effect of
shortening the term of any incumbent director. Anything in this Certificate of
Incorporation or the Bylaws to the contrary notwithstanding, each director
shall hold office until his successor is elected and qualified or until his
earlier death, resignation or removal.
 
  Section 3.02. Nomination and Election. (a) Nominations of persons for
election or reelection to the Board of Directors may be made by or at the
direction of the Board of Directors. The Bylaws may set forth procedures for
the nomination of persons for election or reelection to the Board of Directors
and only persons who are nominated in accordance with such procedures (if any)
shall be eligible for election or reelection as directors of the Corporation;
provided, however, that such procedures shall not infringe upon (i) the right
of the Board of Directors to nominate persons for election or reelection to
the Board of Directors or (ii) the rights of the holders of any series of
Preferred Stock, voting separately by class or series, to elect additional
directors under specified circumstances.
 
                                     A-51
<PAGE>
 
  (b) Each director shall be elected in accordance with this Certificate of
Incorporation, the Bylaws and applicable law. Election of directors by the
Corporation's stockholders need not be by written ballot unless the Bylaws so
provide.
 
  Section 3.03. Removal. No director may be removed except by the affirmative
vote of the holders of not less than 66-2/3% in voting power of all the
outstanding shares of capital stock of the Corporation entitled to vote
generally in an election of directors, voting together as a single class. The
Board of Directors may not remove any director, and no recommendation by the
Board of Directors that a director be removed may be made to the Corporation's
stockholders unless such recommendation is set forth in a resolution adopted
by the affirmative vote of not less than two-thirds of the whole Board of
Directors.
 
  Section 3.04. Vacancies. (a) In case any vacancy shall occur on the Board of
Directors because of death, resignation or removal, such vacancy may be filled
only by a majority (or such higher percentage as may be specified in the
Bylaws) of the directors remaining in office (though less than a quorum), and
the director so appointed shall serve for the unexpired term of his
predecessor or until his successor is elected and qualified or until his
earlier death, resignation or removal. If there are no directors then in
office, an election of directors may be held in the manner provided by
applicable law.
 
  (b) Any newly-created directorship resulting from any increase in the number
of directors may be filled only by a majority (or such higher percentage as
may be specified in the Bylaws) of the directors then in office (though less
than a quorum). Each director so appointed shall hold office until his
successor is elected and qualified or until his earlier death, resignation or
removal.
 
  (c) Except as expressly provided in this Certificate of Incorporation or as
otherwise provided by applicable law, stockholders of the Corporation shall
not have the right to fill vacancies or newly-created directorships on the
Board of Directors.
 
  Section 3.05. Subject to Rights of Holders of Preferred Stock.
Notwithstanding the foregoing provisions of this Article III, if the Preferred
Stock Designation creating any series of Preferred Stock entitles the holders
of such Preferred Stock, voting separately by class or series, to elect
additional directors under specified circumstances, then all provisions of
such Preferred Stock Designation relating to the nomination, election, term of
office, removal, filling of vacancies and other features of such directorships
shall, as to such directorships, govern and control over any conflicting
provisions of this Article III.
 
  Section 3.06. Limitation of Access of Stockholders to Books and Records. In
furtherance of, and not in limitation of, the powers conferred by law, the
Board of Directors is expressly authorized and empowered to determine from
time to time whether and to what extent, and at what times and places, and
under what conditions and regulations, the accounts and books of the
Corporation, or any of them, shall be open to inspection of stockholders and,
except as so determined or as expressly provided in this Certificate of
Incorporation or in any Preferred Stock Designation, no stockholder shall have
any right to inspect any account, book or document of the Corporation other
than such rights as may be conferred by applicable law.
 
  Section 3.07. Limitation of Personal Liability. (a) No person who is or was
a director of the Corporation shall be personally liable to the Corporation or
its stockholders for monetary damages for breach of fiduciary duty as a
director, except for liability (i) for any breach of the director's duty of
loyalty to the Corporation or its stockholders, (ii) for acts or omissions not
in good faith or which involve intentional misconduct or a knowing violation
of law, (iii) under Section 174 of the DGCL or (iv) for any transaction from
which the director derived an improper personal benefit.
 
  (b) If the DGCL is hereafter amended to authorize corporate action further
limiting or eliminating the personal liability of directors, then the personal
liability of the directors to the Corporation or its stockholders shall be
limited or eliminated to the full extent permitted by the DGCL, as so amended
from time to time. Any repeal or modification of this Section 3.07 shall be
prospective only, and shall not adversely affect any limitation on the
personal liability of a director of the Corporation or its stockholders
arising from an act or omission occurring prior to the time of such repeal or
modification.
 
                                     A-52
<PAGE>
 
                                  ARTICLE IV
 
                              AMENDMENT OF BYLAWS
 
  The Board of Directors is expressly authorized and empowered to adopt,
alter, amend or repeal the Bylaws. Stockholders of the Corporation shall have
the power to alter, amend, expand or repeal the Bylaws but only by the
affirmative vote of the holders of not less than 66-2/3% in voting power of
all outstanding shares of capital stock of the Corporation entitled to vote
generally at an election of directors, voting together as a single class.
 
                                   ARTICLE V
 
                     ACTIONS AND MEETINGS OF STOCKHOLDERS
 
  Section 5.01. No Action by Written Consent. No action shall be taken by the
stockholders of the Corporation except at an annual or special meeting of
stockholders. Stockholders of the Corporation may not act by written consent
in lieu of a meeting.
 
  Section 5.02. Meetings. (a) Meetings of the stockholders of the Corporation
(annual or special) may only be called by the Board of Directors or such
officer or officers of the Corporation as the Board of Directors may from time
to time authorize to call meetings of the stockholders of the Corporation.
Stockholders of the Corporation shall not be entitled to call any meeting of
stockholders or to require the Board of Directors or any officer or officers
of the Corporation to call a meeting of stockholders except as otherwise
expressly provided by law or in the Preferred Stock Designation creating any
series of Preferred Stock.
 
  (b) Stockholders of the Corporation shall have the right to propose business
(including, without limitation, the nomination of any person for election or
reelection as a director of the Corporation) for consideration at any meeting
of stockholders but only as may be expressly provided in, and then only in
compliance with, the Bylaws.
 
  (c) Business transacted at any special meeting of stockholders shall be
limited to the purposes stated in the notice or waivers of notice of such
meeting. The person presiding at a meeting of stockholders may determine
whether business (including, without limitation, the nomination of any person
for election or reelection as a director of the Corporation) has been properly
brought before the meeting and, if the facts so warrant, such person may
refuse to transact any business at such meeting which has not been properly
brought before such meeting.
 
  Section 5.03. Appoint and Remove Officers, etc. The stockholders of the
Corporation shall have no right or power to appoint or remove officers of the
Corporation nor to abrogate the power of the Board of Directors to elect and
remove officers of the Corporation. Except as provided in Section 3.03, the
stockholders of the Corporation shall have no power to appoint or remove
directors as members of committees of the Board of Directors nor to abrogate
the power of the Board of Directors to establish one or more such committees
or the power of any such committee to exercise the powers and authority of the
Board of Directors.
 
                                  ARTICLE VI
 
                   INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
  The Corporation shall indemnify, to the fullest extent permitted by
applicable law, each person who is or was a director or officer of the
Corporation and each person who, at the request of the Board of Directors of
the Corporation or an officer of the Corporation, is or was a director or
officer of another corporation, partnership, joint venture, trust or other
enterprise, and may indemnify each employee and agent of the Corporation and
all other persons whom the Corporation is authorized to indemnify under the
provisions of the DGCL. Without limiting the generality or effect of the
foregoing, the Corporation may enter into one or more agreements with any
person which provide for indemnification greater or different than that
provided in this Section 6.01. Any amendment or repeal of this Section 6.01
shall not adversely affect any right or protection existing hereunder in
respect of any act or omission occurring prior to such amendment or repeal.
 
                                     A-53
<PAGE>
 
                                  ARTICLE VII
 
              ELECTION TO BE GOVERNED BY SECTION 203 OF THE DGCL
 
  The Corporation hereby elects to be governed by Section 203 of the DGCL;
provided, however, that the provisions of this Article VII shall not apply to
restrict a business combination between the Corporation and an interested
stockholder (as defined in Section 203 of the DGCL) of the Corporation if
either (i) such business combination was approved by the Board of Directors
prior to the time that such stockholder became an interested stockholder or
(ii) such stockholder became an interested stockholder at or prior to the
Effective Time (as defined in that certain Agreement and Plan of Merger dated
as of April 24, 1996 between Sterling Chemicals, Inc., a Delaware corporation
and STX Acquisition Corp., a Delaware corporation, as amended) as the result
of a transaction which was approved by the Board of Directors prior to the
time that such stockholder became an interested stockholder.
 
                                 ARTICLE VIII
 
                   AMENDMENT OF CERTIFICATE OF INCORPORATION
 
  The Corporation reserves the right to amend, alter, change or repeal any
provisions contained in this Certificate of Incorporation or a Preferred Stock
Designation, in the manner now or hereafter prescribed by applicable law, and
all rights, preferences and privileges conferred upon stockholders, directors
or any other persons by and pursuant to this Certificate of Incorporation are
granted subject to this reservation. Notwithstanding the foregoing or any
other provision of this Certificate of Incorporation or any provision of law
that might otherwise permit a lesser or no vote, the provisions of this
Article VIII and of Articles III, IV and V may not be repealed or amended in
any respect, and no provision inconsistent with any such provision or imposing
cumulative voting in the election of directors may be added to this
Certificate of Incorporation, unless such action is approved by the
affirmative vote of the holders of not less than 66 2/3% in voting power of
all outstanding shares of capital stock of the Corporation entitled to vote
generally at an election of directors, voting together as a single class;
provided, however, that any amendment or repeal of Section 3.08 or Article VI
of this Certificate of Incorporation shall not adversely affect any right or
protection existing hereunder in respect of any act or omission occurring
prior to such amendment or repeal and, provided further, that no Preferred
Stock Designation shall be amended after the issuance of any shares of the
series of Preferred Stock created thereby, except in accordance with the terms
of such Preferred Stock Designation and the requirements of applicable law.
 
                                  ARTICLE IX
 
                       VOTING REQUIREMENTS NOT EXCLUSIVE
 
  The voting requirements contained in this Certificate of Incorporation shall
be in addition to the voting requirements imposed by law or by the Preferred
Stock Designation creating any series of Preferred Stock.
 
                                     A-54
<PAGE>
 
                                    ANNEX B
                  FAIRNESS OPINION OF LAZARD FRERES & CO. LLC
 
                            Lazard Freres & Co. LLC
 
                                April 24, 1996
 
Special Committee of the Board of Directors
 Sterling Chemicals, Inc.
1200 Smith Avenue
Suite 1900
Houston, Texas 77002
 
Dear Members of the Special Committee:
 
  You have requested our opinion as to the fairness, from a financial point of
view, to the stockholders of Sterling Chemicals, Inc. (the "Company") of the
consideration to be received by such stockholders in connection with the
proposed merger (the "Merger") of STX Acquisition Corp. ("Newco"), an
affiliate of The Sterling Group, Inc., with and into the Company pursuant to
the Agreement and Plan of Merger dated as of April 24, 1996 between Newco and
the Company (the "Merger Agreement"). Pursuant to the Merger Agreement, each
issued and outstanding share of common stock of the Company ("Company Common
Stock") will be converted into the right to receive $12.00 in cash unless the
holder elects to retain one share of common stock of the surviving corporation
in the Merger ("Surviving Corporation Common Stock"), in which event (subject
to proration if holders of more than 5,000,000 shares of Company Common Stock
so elect) such share shall be so retained. In connection with this opinion, we
have:
 
    (i) Reviewed the financial terms of the Merger Agreement;
 
    (ii) Analyzed certain historical business and financial information
  relating to the Company, including the Annual Reports to Stockholders and
  Annual Reports on Form 10-K of the Company for the five fiscal years ended
  September 30, 1995 and the Quarterly Report on Form 10-Q of the Company for
  the quarter ended December 31, 1995;
 
    (iii) Reviewed various financial forecasts and other data provided to us
  by the Company relating to the Company's businesses;
 
    (iv) Held discussions with members of the senior management of the
  Company with respect to the businesses and prospects of the Company, and
  the strategic objectives of the Company;
 
    (v) Reviewed public information with respect to certain other companies
  in lines of business we believe to be generally comparable to the
  businesses of the Company;
 
    (vi) Reviewed the financial terms of certain business combinations
  involving companies in lines of businesses we believe to be generally
  comparable to those of the Company, and in other industries generally;
 
    (vii) Reviewed the historical stock prices and trading volumes of the
  Company's Common Stock; and
 
    (viii) Conducted such other financial studies, analyses and
  investigations as we deemed appropriate.
 
  We have not reviewed any proxy statement or similar document that may be
prepared for use in connection with the Merger.
 
  We have relied upon the accuracy and completeness of the foregoing
information, and have not assumed any responsibility for any independent
verification of such information or any independent valuation or appraisal of
any of the assets or liabilities of the Company. With respect to financial
forecasts, we have assumed that they have been reasonably prepared on bases
reflecting the best currently available estimates and judgments of management
of the Company as to the future financial performance of the Company. We
assume no responsibility for and express no view as to such forecasts or the
assumptions on which they are based.
 
                                      B-1
<PAGE>
 
Special Committee of the Board of Directors
April 24, 1996
Page 2
 
  Further, our opinion is necessarily based on economic, monetary, market and
other conditions as in effect on, and the information made available to us as
of, the date hereof and we assume no responsibility to update or revise our
opinion based upon circumstances or events occurring after the date hereof.
Our opinion does not address the Company's underlying business decision to
effect the Merger or constitute a recommendation to any holder of Company
Common Stock as to how such holder should vote with respect to the Merger or
as to what form of merger consideration such holder should elect to receive.
Our opinion as expressed below does not imply any conclusion as to the likely
trading range for the Surviving Corporation Common Stock following the
consummation of the Merger, which may vary depending upon, among other
factors, changes in interest rates, dividend rates, market conditions, general
economic conditions and other factors that generally influence the price of
securities.
 
  In rendering our opinion, we have assumed that the Merger will be
consummated on the terms described in the Merger Agreement, without any waiver
of any material terms or conditions by the Company or Newco and that obtaining
the necessary regulatory approvals for the Merger will not have an adverse
effect on the Company or Newco.
 
  Lazard Freres & Co. LLC ("Lazard") is acting as financial advisor to the
Special Committee in connection with the Merger and will receive a fee for our
services, a substantial portion of which is contingent upon the closing of the
Merger.
 
  In the past, Lazard has performed investment banking services for the
Company and has received fees for such services. Also, a Limited Managing
Director of Lazard is a member of the Board of Directors of the Company.
 
  Our engagement and the opinion expressed herein are for the benefit of the
Special Committee of the Company's Board of Directors. It is understood that,
except for inclusion in a proxy statement relating to the Merger, this letter
may not be disclosed or otherwise referred to without our prior consent,
except as may otherwise be required by law or by a court of competent
jurisdiction.
 
  Based on and subject to the foregoing, we are of the opinion that the
consideration to be received by the stockholders of the Company in connection
with the Merger is fair to such stockholders (other than The Sterling Group,
Inc. or any of its affiliates) from a financial point of view.
 
                                          Very truly yours,
 
                                          LAZARD FRERES & CO. LLC
 
                                          By: /s/ Ali E. Wambold
                                              Managing Director
 
 
                                      B-2
<PAGE>
 
                                    ANNEX C
              SECTION 262 OF THE DELAWARE GENERAL CORPORATION LAW
 
                       DELAWARE--GENERAL CORPORATION LAW
 
(S) 262. APPRAISAL RIGHTS.
 
  (a) Any stockholder of a corporation of this State who holds shares of stock
on the date of the making of a demand pursuant to subsection (d) of this
section with respect to such shares, who continuously holds such shares
through the effective date of the merger or consolidation, who has otherwise
complied with subsection (d) of this section and who has neither voted in
favor of the merger or consolidation nor consented thereto in writing pursuant
to (S) 228 of this title shall be entitled to an appraisal by the Court of
Chancery of the fair value of his shares of stock under the circumstances
described in subsections (b) and (c) of this section. As used in this section,
the word "stockholder" means a holder of record of stock in a stock
corporation and also a member of record of a nonstock corporation; the words
"stock" and "share" mean and include what is ordinarily meant by those words
and also membership or membership interest of a member of a nonstock
corporation; and the words "depository receipt" mean a receipt or other
instrument issued by a depository representing an interest in one or more
shares, or fractions thereof, solely of stock of a corporation, which stock is
deposited with the depository.
 
  (b) Appraisal rights shall be available for the shares of any class or
series of stock of a constituent corporation in a merger or consolidation to
be effected pursuant to (S)(S) 251 (other than a merger effected pursuant to
subsection (g) of (S) 251), 252, 254, 257, 258, 263 or 264 of this title:
 
    (1) Provided, however, that no appraisal rights under this section shall
  be available for the shares of any class or series of stock, which stock,
  or depository receipts in respect thereof, at the record date fixed to
  determine the stockholders entitled to receive notice of and to vote at the
  meeting of stockholders to act upon the agreement of merger or
  consolidation, were either (i) listed on a national securities exchange or
  designated as a national market system security on an interdealer quotation
  system by the National Association of Securities Dealers, Inc. or (ii) held
  of record by more than 2,000 holders; and further provided that no
  appraisal rights shall be available for any shares of stock of the
  constituent corporation surviving a merger if the merger did not require
  for its approval the vote of the stockholders of the surviving corporation
  as provided in subsection (f) of (S) 251 of this title.
 
    (2) Notwithstanding paragraph (1) of this subsection, appraisal rights
  under this section shall be available for the shares of any class or series
  of stock of a constituent corporation if the holders thereof are required
  by the terms of an agreement of merger or consolidation pursuant to
  (S)(S) 251, 252, 254, 257, 258, 263 and 264 of this title to accept for
  such stock anything except:
 
      a. Shares of stock of the corporation surviving or resulting from
    such merger or consolidation, or depository receipts in respect
    thereof;
 
      b. Shares of stock of any other corporation, or depository receipts
    in respect thereof, which shares of stock or depository receipts at the
    effective date of the merger or consolidation will be either listed on
    a national securities exchange or designated as a national market
    system security on an interdealer quotation system by the National
    Association of Securities Dealers, Inc. or held of record by more than
    2,000 holders;
 
      c. Cash in lieu of fractional shares or fractional depository
    receipts described in the foregoing subparagraphs a. and b. of this
    paragraph; or
 
      d. Any combination of the shares of stock, depository receipts and
    cash in lieu of fractional shares or fractional depository receipts
    described in the foregoing subparagraphs a., b. and c. of this
    paragraph.
 
                                      C-1
<PAGE>
 
    (3) In the event all of the stock of a subsidiary Delaware corporation
  party to a merger effected under (S)  253 of this title is not owned by the
  parent corporation immediately prior to the merger, appraisal rights shall
  be available for the shares of the subsidiary Delaware corporation.
 
  (c) Any corporation may provide in its certificate of incorporation that
appraisal rights under this section shall be available for the shares of any
class or series of its stock as a result of an amendment to its certificate of
incorporation, any merger or consolidation in which the corporation is a
constituent corporation or the sale of all or substantially all of the assets
of the corporation. If the certificate of incorporation contains such a
provision, the procedures of this section, including those set forth in
subsections (d) and (e) of this section, shall apply as nearly as is
practicable.
 
  (d) Appraisal rights shall be perfected as follows:
 
    (1) If a proposed merger or consolidation for which appraisal rights are
  provided under this section is to be submitted for approval at a meeting of
  stockholders, the corporation, not less than 20 days prior to the meeting,
  shall notify each of its stockholders who was such on the record date for
  such meeting with respect to shares for which appraisal rights are
  available pursuant to subsection (b) or (c) hereof that appraisal rights
  are available for any or all of the shares of the constituent corporations,
  and shall include in such notice a copy of this section. Each stockholder
  electing to demand the appraisal of his shares shall deliver to the
  corporation, before the taking of the vote on the merger or consolidation,
  a written demand for appraisal of his shares. Such demand will be
  sufficient if it reasonably informs the corporation of the identity of the
  stockholder and that the stockholder intends thereby to demand the
  appraisal of his shares. A proxy or vote against the merger or
  consolidation shall not constitute such a demand. A stockholder electing to
  take such action must do so by a separate written demand as herein
  provided. Within 10 days after the effective date of such merger or
  consolidation, the surviving or resulting corporation shall notify each
  stockholder of each constituent corporation who has complied with this
  subsection and has not voted in favor of or consented to the merger or
  consolidation of the date that the merger or consolidation has become
  effective; or
 
    (2) If the merger or consolidation was approved pursuant to Section 228
  or Section 253 of this title, each constituent corporation, either before
  the effective date of the merger or consolidation or within ten days
  thereafter, shall notify each of the holders of any class or series of
  stock of such constituent corporation that are entitled to appraisal rights
  of the approval of the merger or consolidation and that appraisal rights
  are available for any or all shares of such class or series of stock of
  such constituent corporation, and shall include in such notice a copy of
  this section; provided that, if the notice is given on or after the
  effective date of the merger or consolidation, such notice shall be given
  by the surviving or resulting corporation to all such holders of any class
  or series of stock of a constituent corporation that are entitled to
  appraisal rights. Any stockholder entitled to appraisal rights may, within
  twenty days after the date of mailing of such notice, demand in writing
  from the surviving or resulting corporation the appraisal of such holder's
  shares. Such demand will be sufficient if it reasonably informs the
  corporation of the identity of the stockholder and that the stockholder
  intends thereby to demand the appraisal of such holder's shares. If such
  notice did not notify stockholders of the effective date of the merger or
  consolidation either (i) each such constituent corporation shall send a
  second notice before the effective date of the merger or consolidation
  notifying each of the holders of any class or series of stock of such
  constituent corporation that are entitled to appraisal rights of the
  effective date of the merger or consolidation or (ii) the surviving or
  resulting corporation shall send a second notice to all such holders on or
  within 10 days after such effective date; provided, however, that if such
  second notice is sent more than 20 days following the sending of the first
  notice, such second notice need only to be sent to each stockholder who is
  entitled to appraisal rights and who has demanded appraisal of such
  holder's shares in accordance with this subsection. An affidavit of the
  secretary or assistant secretary or of the transfer agent of the
  corporation that is required to give either notice that such notice has
  been given shall in the absence of fraud, be prima facie evidence of the
  facts stated therein. For purposes of determining the stockholders entitled
  to receive such notice, each constituent corporation may fix in advance, a
  record date that shall be not more than 10 days prior to the date the
  notice is given; provided that, if the notice is given on or after the
  effective date of the merger or consolidation,
 
                                      C-2
<PAGE>
 
  the record date shall be the effective date. If no record date is fixed and
  the notice is given prior to the effective date, the record date shall be
  the close of business on the next day preceding the day on which the notice
  is given. If the merger or consolidation was approved pursuant to (S) 228
  or 253 of this title, the surviving or resulting corporation, either before
  the effective date of the merger or consolidation or within 10 days
  thereafter, shall notify each of the stockholders entitled to appraisal
  rights of the effective date of the merger or consolidation and that
  appraisal rights are available for any or all of the shares of the
  constituent corporation, and shall include in such notice a copy of this
  section. The notice shall be sent by certified or registered mail, return
  receipt requested, addressed to the stockholder at his address as it
  appears on the records of the corporation. Any stockholder entitled to
  appraisal rights may, within 20 days after the date of mailing of the
  notice, demand in writing from the surviving or resulting corporation the
  appraisal of his shares. Such demand will be sufficient if it reasonably
  informs the corporation of the identity of the stockholder and that the
  stockholder intends thereby to demand the appraisal of his shares.
 
  (e) Within 120 days after the effective date of the merger or consolidation,
the surviving or resulting corporation or any stockholder who has complied
with subsections (a) and (d) hereof and who is otherwise entitled to appraisal
rights, may file a petition in the Court of Chancery demanding a determination
of the value of the stock of all such stockholders. Notwithstanding the
foregoing, at any time within 60 days after the effective date of the merger
or consolidation, any stockholder shall have the right to withdraw his demand
for appraisal and to accept the terms offered upon the merger or
consolidation. Within 120 days after the effective date of the merger or
consolidation, any stockholder who has complied with the requirements of
subsections (a) and (d) hereof, upon written request, shall be entitled to
receive from the corporation surviving the merger or resulting from the
consolidation a statement setting forth the aggregate number of shares not
voted in favor of the merger or consolidation and with respect to which
demands for appraisal have been received and the aggregate number of holders
of such shares. Such written statement shall be mailed to the stockholder
within 10 days after his written request for such a statement is received by
the surviving or resulting corporation or within 10 days after expiration of
the period for delivery of demands for appraisal under subsection (d) hereof,
whichever is later.
 
  (f) Upon the filing of any such petition by a stockholder, service of a copy
thereof shall be made upon the surviving or resulting corporation, which shall
within 20 days after such service file in the office of the Register in
Chancery in which the petition was filed a duly verified list containing the
names and addresses of all stockholders who have demanded payment for their
shares and with whom agreements as to the value of their shares have not been
reached by the surviving or resulting corporation. If the petition shall be
filed by the surviving or resulting corporation, the petition shall be
accompanied by such a duly verified list. The Register in Chancery, if so
ordered by the Court, shall give notice of the time and place fixed for the
hearing of such petition by registered or certified mail to the surviving or
resulting corporation and to the stockholders shown on the list at the
addresses therein stated. Such notice shall also be given by 1 or more
publications at least 1 week before the day of the hearing, in a newspaper of
general circulation published in the City of Wilmington, Delaware or such
publication as the Court deems advisable. The forms of the notices by mail and
by publication shall be approved by the Court, and the costs thereof shall be
borne by the surviving or resulting corporation.
 
  (g) At the hearing on such petition, the Court shall determine the
stockholders who have complied with this section and who have become entitled
to appraisal rights. The Court may require the stockholders who have demanded
an appraisal for their shares and who hold stock represented by certificates
to submit their certificates of stock to the Register in Chancery for notation
thereon of the pendency of the appraisal proceedings; and if any stockholder
fails to comply with such direction, the Court may dismiss the proceedings as
to such stockholder.
 
  (h) After determining the stockholders entitled to an appraisal, the Court
shall appraise the shares, determining their fair value exclusive of any
element of value arising from the accomplishment or expectation of the merger
or consolidation, together with a fair rate of interest, if any, to be paid
upon the amount determined to be the fair value. In determining such fair
value, the Court shall take into account all relevant factors. In determining
the fair rate of interest, the Court may consider all relevant factors,
including the rate of interest which the surviving or resulting corporation
would have had to pay to borrow money during the pendency of the
 
                                      C-3
<PAGE>
 
proceeding. Upon application by the surviving or resulting corporation or by
any stockholder entitled to participate in the appraisal proceeding, the Court
may, in its discretion, permit discovery or other pretrial proceedings and may
proceed to trial upon the appraisal prior to the final determination of the
stockholder entitled to an appraisal. Any stockholder whose name appears on
the list filed by the surviving or resulting corporation pursuant to
subsection (f) of this section and who has submitted his certificates of stock
to the Register in Chancery, if such is required, may participate fully in all
proceedings until it is finally determined that he is not entitled to
appraisal rights under this section.
 
  (i) The Court shall direct the payment of the fair value of the shares,
together with interest, if any, by the surviving or resulting corporation to
the stockholders entitled thereto. Interest may be simple or compound, as the
Court may direct. Payment shall be so made to each such stockholder, in the
case of holders of uncertificated stock forthwith, and the case of holders of
shares represented by certificates upon the surrender to the corporation of
the certificates representing such stock. The Court's decree may be enforced
as other decrees in the Court of Chancery may be enforced, whether such
surviving or resulting corporation be a corporation of this State or of any
state.
 
  (j) The costs of the proceeding may be determined by the Court and taxed
upon the parties as the Court deems equitable in the circumstances. Upon
application of a stockholder, the Court may order all or a portion of the
expenses incurred by any stockholder in connection with the appraisal
proceeding, including, without limitation, reasonable attorney's fees and the
fees and expenses of experts, to be charged pro rata against the value of all
the shares entitled to an appraisal.
 
  (k) From and after the effective date of the merger or consolidation, no
stockholder who has demanded his appraisal rights as provided in subsection
(d) of this section shall be entitled to vote such stock for any purpose or to
receive payment of dividends or other distributions on the stock (except
dividends or other distributions payable to stockholders of record at a date
which is prior to the effective date of the merger or consolidation);
provided, however, that if no petition for an appraisal shall be filed within
the time provided in subsection (e) of this section, or if such stockholder
shall deliver to the surviving or resulting corporation a written withdrawal
of his demand for an appraisal and an acceptance of the merger or
consolidation, either within 60 days after the effective date of the merger or
consolidation as provided in subsection (e) of this section or thereafter with
the written approval of the corporation, then the right of such stockholder to
an appraisal shall cease. Notwithstanding the foregoing, no appraisal
proceeding in the Court of Chancery shall be dismissed as to any stockholder
without the approval of the Court, and such approval may be conditioned upon
such terms as the Court deems just.
 
  (l) The shares of the surviving or resulting corporation to which the shares
of such objecting stockholders would have been converted had they assented to
the merger or consolidation shall have the status of authorized and unissued
shares of the surviving or resulting corporation.
 
                                      C-4
<PAGE>
 
                                    ANNEX D
 
               OFFICERS AND DIRECTORS OF TSG AND STX ACQUISITION
 
  The following table sets forth the name, principal occupation or employment
at the present time and during the past five years, and beneficial ownership
of securities of the Company of each director and each executive officer of
TSG and STX Acquisition. Each person listed below is a citizen of the United
States and the business address of each such person is Eight Greenway Plaza,
Suite 702, Houston, Texas 77046.
 
<TABLE>   
<CAPTION>
                            BENEFICIAL
                           OWNERSHIP OF
                          COMPANY COMMON               PRINCIPAL OCCUPATION
           NAME               STOCK                     AND PAST EMPLOYMENT
           ----           --------------               --------------------
 <C>                      <C>            <S>
 Frank J. Hevrdejs....... 597,000 shares Principal and President of TSG, which he co-
                                          founded in 1982. Mr. Hevrdejs is Chairman of
                                          First Sterling Ventures Corp., an investment
                                          company, Enduro Holdings, Inc., a structural
                                          and electrical manufacturing company, and
                                          Fibreglass Holdings, Inc., a truck accessory
                                          manufacturer. He is also a director of Mail-
                                          Well, Inc., an envelope manufacturer and
                                          commercial printer, Purina Mills, Inc., an
                                          animal feed producer, and Eagle U.S.A., an air
                                          freight company. Mr Hevrdejs also serves as
                                          sole director and President of STX Acquisition.
 Hunter Nelson...........      None      Principal and Vice President of TSG since 1989.
                                          Mr. Nelson is a director of Sterling Diagnostic
                                          Imaging, Inc. and several other private
                                          companies. Mr. Nelson also serves as Vice
                                          President, Secretary and Treasurer of STX
                                          Acquisition.
 William C. Oehmig....... 300,000 shares Principal and Vice President of TSG since 1985.
                                          Mr. Oehmig currently serves as a director of PM
                                          Holdings Corporation, Purina Mills, Inc. and
                                          the Vanderbilt University Alumni Association.
 Susan O. Rheney.........      None      Principal and Vice President of TSG since
                                          February 1992. Ms. Rheney worked as an
                                          independent financial consultant from December
                                          1990 to January 1992. She is also a director of
                                          Mail-Well, Inc.
 John D. Hawkins.........      None      Vice President of TSG since April 1996 and
                                          Associate of TSG from 1992 to 1996. Mr. Hawkins
                                          serves as Vice President, Assistant Secretary
                                          and Assistant Treasurer of STX Acquisition.
</TABLE>    
 
                                      D-1
<PAGE>
 
 
PROXY                      STERLING CHEMICALS, INC.
                 PROXY IS SOLICITED BY THE BOARD OF DIRECTORS
                      FOR SPECIAL MEETING OF STOCKHOLDERS
                               AUGUST [  ], 1996
  THE UNDERSIGNED HEREBY APPOINTS EACH OF [      AND      ], PROXIES WITH FULL
POWER OF SUBSTITUTION, WITH THE POWERS (EACH HAVING FULL POWER TO ACT WITHOUT
THE OTHER) THE UNDERSIGNED WOULD POSSESS IF PERSONALLY PRESENT, TO VOTE, AS
DESIGNATED BELOW, ALL SHARES OF THE $.01 PAR VALUE COMMON STOCK HELD BY THE
UNDERSIGNED IN STERLING CHEMICALS, INC. (THE "COMPANY") AT THE SPECIAL MEETING
OF STOCKHOLDERS TO BE HELD ON AUGUST [  ], 1996 (THE "SPECIAL MEETING"), AND
AT ANY ADJOURNMENT OR POSTPONEMENT THEREOF.
 
  THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS OF THE COMPANY
AND WILL BE VOTED FOR PROPOSAL 1 BELOW UNLESS OTHERWISE INDICATED.
 
  1. THE APPROVAL AND ADOPTION OF THE AMENDED AND RESTATED AGREEMENT AND PLAN
    OF MERGER, DATED AS OF APRIL 24, 1996, BETWEEN THE COMPANY AND STX
    ACQUISITION CORP.
 
    [_] FOR                      [_] AGAINST                      [_] ABSTAIN
 
  2. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON ANY OTHER
    MATTER THAT MAY COME BEFORE THE SPECIAL MEETING OR ANY ADJOURNMENT OR
    POSTPONEMENT THEREOF.
 
   (PLEASE SIGN AND DATE THIS PROXY ON THE REVERSE SIDE AND RETURN IT IN THE
                            ACCOMPANYING ENVELOPE.)
 
  THIS PROXY, IF PROPERLY EXECUTED, WILL BE VOTED IN ACCORDANCE WITH THE
UNDERSIGNED'S DIRECTION AS SET FORTH HEREIN. IF NO DIRECTION IS MADE, THIS
PROXY WILL BE VOTED FOR PROPOSAL 1. THIS PROXY MAY BE REVOKED IN WRITING PRIOR
TO ITS EXERCISE.
  PLEASE SIGN YOUR NAME EXACTLY AS IT APPEARS BELOW. IF SHARES ARE HELD
JOINTLY, ALL JOINT OWNERS SHOULD SIGN. IF SHARES ARE HELD BY A CORPORATION,
PLEASE SIGN THE FULL CORPORATE NAME BY THE PRESIDENT OR ANY OTHER AUTHORIZED
CORPORATE OFFICER. IF SHARES ARE HELD BY A PARTNERSHIP, PLEASE SIGN THE FULL
PARTNERSHIP NAME BY AN AUTHORIZED PERSON. IF YOU ARE SIGNING AS AN ATTORNEY,
EXECUTOR, ADMINISTRATOR, TRUSTEE OR GUARDIAN, PLEASE SET FORTH YOUR FULL TITLE
AS SUCH.
                                              THE UNDERSIGNED HEREBY REVOKES
                                            ANY PROXIES HERETOFORE GIVEN TO
                                            VOTE UPON OR ACT WITH RESPECT TO
                                            SUCH SHARES AND HEREBY RATIFIES
                                            AND CONFIRMS ALL THAT SAID
                                            ATTORNEYS, AGENTS, PROXIES, THE
                                            SUBSTITUTES OR ANY OF THEM MAY
                                            LAWFULLY DO BY VIRTUE HEREOF.
 
                                            DATED:________________________, 1996
 
                                            ___________________________________
 
                                            ___________________________________
                                              SIGNATURE(S) OF STOCKHOLDER(S)


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission