LYONDELL PETROCHEMICAL CO
8-K, 1998-06-22
PETROLEUM REFINING
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549


                                   FORM 8-K

                            CURRENT REPORT PURSUANT

                         to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934


       Date of Report (date of earliest event reported): JUNE 18, 1998. 


                        LYONDELL PETROCHEMICAL COMPANY
            (Exact name of registrant as specified in its charter)

                                   DELAWARE
                (State or other jurisdiction of incorporation)

          1-10145                                95-4160558
  (Commission File Number)          (I.R.S. Employer Identification No.)
 
1221 MCKINNEY STREET, SUITE 1600, HOUSTON, TEXAS              77010
   (Address of principal executive offices)                 (Zip Code)


                                (713) 652-7200
             (Registrant's telephone number, including area code)

                                NOT APPLICABLE
         (Former Name or Former Address, if Changed Since Last Report)
<PAGE>
 
ITEM 2.   OTHER EVENTS.

     On June 18, 1998, Lyondell Petrochemical Company (the "Registrant") issued
a press release (Exhibit 99 hereto) detailing an agreement to acquire all of the
shares of ARCO Chemical Company.

                                                                               2
<PAGE>
 
ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS.
 
     (c) Exhibits
 
   Exhibit         Document
- -------------    ------------
 
     10.1        -  Agreement and Plan of Merger, dated June 18, 1998 among the
                    Registrant, Lyondell Acquisition Corporation and ARCO
                    Chemical Company.
 
     10.2        -  Tax Agreement, dated June 18, 1998 among the Atlantic
                    Richfield Company, ARCO Chemical Company and the Registrant.
 
     10.3        -  Tender and Voting Agreement dated June 18, 1998 among the
                    Registrant, Lyondell Acquisition Corporation and Atlantic
                    Richfield Company.
 
     99          -  Press Release dated June 18, 1998.
 

                                                                               3
<PAGE>
 
                                 EXHIBIT INDEX

   Exhibit         Document
- -------------    ------------
 
     10.1        -  Agreement and Plan of Merger, dated June 18, 1998 among the
                    Registrant, Lyondell Acquisition Corporation and ARCO
                    Chemical Company.
 
     10.2        -  Tax Agreement, dated June 18, 1998 among the Atlantic
                    Richfield Company, ARCO Chemical Company and the Registrant.
 
     10.3        -  Tender and Voting Agreement dated June 18, 1998 among the
                    Registrant, Lyondell Acquisition Corporation and Atlantic
                    Richfield Company.
 
     99          -  Press Release dated June 18, 1998.

                                                                               4
<PAGE>
 
                                   SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                              LYONDELL PETROCHEMICAL COMPANY



                              By:   /s/ Kerry A. Galvin
                                  ---------------------
                                  Kerry A. Galvin
                                  Chief Corporate Counsel
                                  and Corporate Secretary

Date:  June 19, 1998

                                                                               5

<PAGE>

                                                                    EXHIBIT 10.1
 
                          AGREEMENT AND PLAN OF MERGER
                                     among
                        LYONDELL PETROCHEMICAL COMPANY,
                        LYONDELL ACQUISITION CORPORATION
                                      and
                             ARCO CHEMICAL COMPANY
                           Dated as of June 18, 1998

<PAGE>
 
                               TABLE OF CONTENTS
                          AGREEMENT AND PLAN OF MERGER

                                                                            Page
                                                                            ----

                                   ARTICLE I

                                     OFFER


 SECTION 1.1.  The Offer
 SECTION 1.2.  Company Actions
 SECTION 1.3.  Directors

                                   ARTICLE II

                                   THE MERGER


 SECTION 2.1.  The Merger
 SECTION 2.2.  Closing
 SECTION 2.3.  Effective Time
 SECTION 2.4.  Effects of the Merger
 SECTION 2.5.  Certificate of Incorporation and By-laws
 SECTION 2.6.  Directors
 SECTION 2.7.  Officers

                                  ARTICLE III

                            CONVERSION OF SECURITIES

 SECTION 3.1.  Effect on Capital Stock
 SECTION 3.2.  Exchange of Certificates
<PAGE>
 
                                   ARTICLE IV

                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY

 SECTION 4.1.  Organization
 SECTION 4.2.  Subsidiaries
 SECTION 4.3.  Capitalization
 SECTION 4.4.  Authority
 SECTION 4.5.  Consents and Approvals; No Violations
 SECTION 4.6.  SEC Documents; Financial Statements
 SECTION 4.7.  Information Supplied
 SECTION 4.8.  Absence of Certain Changes or Events
 SECTION 4.9.  Litigation
 SECTION 4.10. Benefit Plans and Matters
 SECTION 4.11. Compliance with Laws
 SECTION 4.12. Environmental Matters
 SECTION 4.13. Taxes
 SECTION 4.14. Technology and Intellectual Property
 SECTION 4.15. Opinion of Financial Advisor
 SECTION 4.16. Brokers; Schedule of Fees and Expenses
 SECTION 4.17. Affiliated Written Transactions
 SECTION 4.18. State Takeover Statutes
 SECTION 4.19. Title
<PAGE>
 
                                   ARTICLE V

           REPRESENTATIONS AND WARRANTIES OF PURCHASER AND MERGER SUB


 SECTION 5.1.  Organization
 SECTION 5.2.  Authority
 SECTION 5.3.  Consents and Approvals; No Violations
 SECTION 5.4.  Information Supplied
 SECTION 5.5.  Financing
 SECTION 5.6.  Ownership of Shares
 SECTION 5.7.  Brokers

                                   ARTICLE VI

                                   COVENANTS


 SECTION 6.1.  Conduct of Business
 SECTION 6.2.  No Solicitation
 SECTION 6.3.  Use of Names and Logos


                                  ARTICLE VII

                             ADDITIONAL AGREEMENTS

 SECTION 7.1.  Company Stockholder Approval
 SECTION 7.2.  Access to Information; Confidentiality
 SECTION 7.3.  Reasonable Efforts; Notification
<PAGE>
 
 SECTION 7.4.  Stock Incentive Plans
 SECTION 7.5.  Indemnification, Exculpation and Insurance
 SECTION 7.6.  Fees and Expenses
 SECTION 7.7.  Public Announcements
 SECTION 7.8.  Employee Benefits Matters
 SECTION 7.9.  Termination of Other Agreements
 SECTION 7.10. Insurance


                                  ARTICLE VIII

                                   CONDITIONS

 SECTION 8.1.  Conditions to Each Party's Obligation to Effect the Merger


                                   ARTICLE IX

                           TERMINATION AND AMENDMENT

 SECTION 9.1.  Termination
 SECTION 9.2.  Effect of Termination
 SECTION 9.3.  Amendment
 SECTION 9.4.  Extension; Waiver
 SECTION 9.5.  Procedure for Termination, Amendment, Extension or Waiver
<PAGE>
 
                                   ARTICLE X

                                 MISCELLANEOUS

 SECTION 10.1. Nonsurvival of Representations, Warranties and Agreements
 SECTION 10.2. Notices
 SECTION 10.3. Interpretation
 SECTION 10.4. Counterparts
 SECTION 10.5. Entire Agreement; Third Party Beneficiaries
 SECTION 10.6. Governing Law
 SECTION 10.7. Assignment
 SECTION 10.8. Enforcement

 EXHIBIT A     CONDITIONS OF THE OFFER
<PAGE>
 
                                      -7-

          AGREEMENT AND PLAN OF MERGER (the "Agreement"), dated as of
June 18, 1998, among Lyondell Petrochemical Company, a Delaware corporation
("Purchaser"), Lyondell Acquisition Corporation, a Delaware corporation and a
wholly-owned subsidiary of Purchaser ("Merger Sub"), and ARCO Chemical Company,
a Delaware corporation (the "Company").

          WHEREAS, the respective Boards of Directors of Purchaser, Merger Sub
and the Company have approved the acquisition of the Company by Purchaser upon
the terms and subject to the conditions set forth in this Agreement;

          WHEREAS, in furtherance of such acquisition, Purchaser proposes to
cause Merger Sub to make a tender offer to purchase all the outstanding shares
of Common Stock, par value $1.00 per share, of the Company (the "Company Common
Stock"; all the outstanding shares of Company Common Stock being hereinafter
collectively referred to as the "Shares") at a purchase price of $57.75 per
Share (the "Offer Price"), net to the seller in cash, without interest thereon,
upon the terms and subject to the conditions set forth in this Agreement (as it
may be amended from time to time as permitted under this Agreement, the
"Offer"); and the Board of Directors of the Company has adopted resolutions
approving the Offer, the Merger (as defined below), the Tax Agreement (as
defined below) and, for purposes of Section 203 of the DGCL (defined in Section
1.2), the Tender and Voting Agreement (as defined below), recommending that the
Company's stockholders accept the Offer and approving the acquisition of Shares
by Merger Sub pursuant to the Offer;

          WHEREAS, the respective Boards of Directors of Purchaser, Merger Sub
and the Company have each approved the merger of Merger Sub into the Company
(the "Merger"), upon the terms and subject to the conditions set forth in this
Agreement, whereby each Share, other than Dissenting Shares (as defined in
Section 3.1(d) hereof), shall be converted into the right to receive the price
per Share paid in the Offer, and the Company shall become a wholly-owned
subsidiary of Purchaser;

          WHEREAS, concurrently with the execution of this Agreement and as an
inducement to Purchaser to enter into this Agreement, Purchaser and Atlantic
Richfield Company, a Delaware corporation and the majority stockholder of the
Company ("Parent"), are entering into a Tender and Voting Agreement of even date
herewith (the "Tender and Voting Agreement") pursuant to which Parent has
agreed, upon the terms and subject to the conditions set therein, to tender all
of the Shares owned by Parent to Merger Sub pursuant to the Offer; and

          WHEREAS, concurrently with the execution of this Agreement, Purchaser,
Parent and the Company are entering into a Tax Agreement of even date herewith
relating to certain tax matters;

          NOW, THEREFORE, in consideration of the foregoing and the
representations, warranties and agreements contained herein, and intending to be
legally bound hereby, Purchaser, Merger Sub and the Company hereby agree as
follows:
<PAGE>
 
                                      -8-

                                   ARTICLE I

                                     OFFER

          SECTION 1.1. The Offer.  (a)__As promptly as practicable but in no
event later than five business days after the date of the public announcement
(on the date hereof or the following day) by Purchaser and the Company of this
Agreement, Merger Sub shall, and Purchaser shall cause Merger Sub to, commence
the Offer (within the meaning of Rule 14d-2 under the Securities Exchange Act of
1934, as amended (the "Exchange Act")).  The obligation of Merger Sub to, and of
Purchaser to cause Merger Sub to, commence the Offer, conduct and consummate the
Offer and accept for payment, and pay for, any Shares tendered and not withdrawn
pursuant to the Offer shall be subject only to the conditions set forth on
Exhibit A hereto (the "Offer Conditions") (any of which (other than the Minimum
Condition and the Antitrust Condition (as such terms are defined in Exhibit A))
may be waived in whole or in part by Merger Sub in its sole discretion).  Merger
Sub expressly reserves the right, subject to compliance with the Exchange Act,
to modify the terms of the Offer, except that, without the express written
consent of the Company, Merger Sub shall not (i)__reduce the number of Shares
subject to the Offer, (ii)__reduce the Offer Price, (iii)__add to or modify the
Offer Conditions, (iv)__except as provided in the following sentence, extend the
Offer, (v)__change the form of consideration payable in the Offer or (vi)__amend
or alter any other term of the Offer in any manner adverse to the holders of the
Shares.  Notwithstanding the foregoing, Merger Sub may, without the consent of
the Company, (A) extend the Offer for any period required by any rule,
regulation, interpretation or position of the Securities and Exchange Commission
(the "SEC") or the staff thereof applicable to the Offer, (B) extend the Offer,
if at the scheduled or extended expiration date of the Offer, any of the Offer
Conditions shall not be satisfied or waived, until such time as such conditions
are satisfied or waived and (C) extend the Offer on one occasion for a period of
not more than 10 business days beyond the latest expiration date that would
otherwise be permitted under clause (A) or (B) of this sentence, if on such
expiration date there shall not have been tendered at least 90% of the
outstanding Shares.  Notwithstanding the foregoing, Merger Sub may not, without
the Company's prior written consent, extend the Offer pursuant to clause (B) of
the prior sentence if the failure to satisfy any of the Offer Conditions was
directly or indirectly caused by an act or omission of Purchaser or Merger Sub
that constitutes a breach of this Agreement. Purchaser and Merger Sub agree that
if any Offer Condition (other than the Minimum Condition and the Offer Condition
set forth in paragraph (e) of Exhibit A) is not satisfied on any scheduled
expiration date of the Offer, then Merger Sub shall extend the Offer from time
to time until all the Offer Conditions have been satisfied or waived, provided
that (i)__any such unsatisfied condition is reasonably capable of being
satisfied, (ii)__any Takeover Proposal theretofore received by the Company has
been rejected by the Company (or, if such Takeover Proposal has not been
rejected by the Company as of such scheduled expiration date, such Takeover
Proposal was received by the Company less than ten days prior to such scheduled
<PAGE>
 
                                      -9-


expiration date), as confirmed in writing by the Company to Purchaser setting
forth the date any such Takeover Proposal was received, and (iii) Merger Sub
shall not be required to extend the Offer to a date that is later than the
Outside Date (as defined in 9.1(c)).  Subject to the terms and conditions of the
Offer and this Section 1.1(a), Merger Sub shall, and Purchaser shall cause
Merger Sub to, accept for payment, and pay for, all Shares validly tendered and
not withdrawn pursuant to the Offer as soon as practicable after the expiration
of the Offer.

          (b) On the date of commencement of the Offer, Purchaser and Merger Sub
shall file with the SEC a Tender Offer Statement on Schedule 14D-1 (the
"Schedule 14D-1") with respect to the Offer, which shall contain an offer to
purchase and a related letter of transmittal, a summary advertisement and such
other documents as are customarily filed with a Schedule 14D-1 (such Schedule
14D-1 and the documents included therein pursuant to which the Offer shall be
made, together with any supplements or amendments thereto, being hereinafter
collectively referred to as the "Offer Documents"). Each of Purchaser, Merger
Sub and the Company agrees promptly to correct any written information provided
by it for use in the Offer Documents if and to the extent that such information
shall have become false or misleading in any material respect, and Purchaser and
Merger Sub further agree to take all steps necessary to cause the Schedule 14D-1
as so corrected to be filed with the SEC and the other Offer Documents as so
corrected to be disseminated to holders of Shares, in each case as and to the
extent required by applicable Federal securities laws.  The Company and its
counsel shall be given reasonable opportunity to review and comment upon the
Offer Documents prior to their filing with the SEC or dissemination to
stockholders of the Company.  Purchaser and Merger Sub agree to provide the
Company and its counsel any comments Purchaser, Merger Sub or their counsel may
receive from the SEC or its staff with respect to the Offer Documents promptly
after the receipt of such comments.

          (c) Purchaser shall provide or cause to be provided to Merger Sub on a
timely basis the funds sufficient to accept for payment and pay for, any and all
Shares that Merger Sub becomes obligated to accept for payment, and pay for,
pursuant to the Offer.

          SECTION 1.2. Company Actions.  (a)__The Company hereby approves of and
consents to the Offer and represents that the Board of Directors of the Company,
at a meeting duly called and held, duly adopted resolutions (i) approving this
Agreement, the Offer, the Merger, the Tax Agreement, and, for purposes of
Section 203 of the Delaware General Corporation Law (the "DGCL"), the Tender and
Voting Agreement, (ii) determining that the terms of the Offer and the Merger
are fair to, and in the best interests of, the Company's stockholders and (iii)
recommending that the Company's stockholders accept the Offer, tender their
Shares pursuant to the Offer and (if required by the DGCL) approve and adopt
this Agreement.  The Company represents that the foregoing action of the Board
of Directors of the Company in approving this Agreement, the Offer, the Merger
and the Tender and Voting Agreement is sufficient to render inapplicable to this
Agreement (and the transactions provided 
<PAGE>
 
                                     -10-

for herein) and the Tender and Voting Agreement the restrictions on "business
combinations" (as defined in Section 203 of the DGCL) set forth in Section 203
of the DGCL.

          (b) On the date the Offer Documents are filed with the SEC, or
promptly thereafter, the Company shall file with the SEC a
Solicitation/Recommendation Statement on Schedule 14D-9 with respect to the
Offer (such Schedule 14D-9, as amended from time to time, being hereinafter
referred to as the "Schedule 14D-9") containing the recommendation described in
Section 1.2(a) hereof and shall mail the Schedule 14D-9 to the stockholders of
the Company. Each of the Company, Purchaser and Merger Sub agrees promptly to
correct any written information provided by it for use in the Schedule 14D-9 if
and to the extent that such information shall have become false or misleading in
any material respect, and the Company further agrees to take all steps necessary
to amend or supplement the Schedule 14D-9 and to cause the Schedule 14D-9 as so
amended or supplemented to be filed with the SEC and disseminated to the
Company's stockholders, in each case as and to the extent required by applicable
Federal securities laws.  Purchaser and its counsel shall be given reasonable
opportunity to review and comment upon the Schedule 14D-9 prior to its filing
with the SEC or dissemination to stockholders of the Company.  The Company
agrees to provide Purchaser and its counsel any comments the Company or its
counsel may receive from the SEC or its staff with respect to the Schedule 14D-9
promptly after the receipt of such comments.

          (c) In connection with the Offer and the Merger, the Company shall
cause its transfer agent to furnish Merger Sub promptly with mailing labels
containing the names and addresses of the record holders of Shares as of a
recent date and of those persons becoming record holders subsequent to such
date, together with copies of all lists of stockholders, security position
listings and computer files and all other information in the Company's
possession regarding the beneficial owners of Shares, and shall furnish to
Merger Sub such information and assistance (including updated lists of
stockholders, security position listings and computer files) as Purchaser may
reasonably request in communicating the Offer to the Company's stockholders.
Subject to the requirements of applicable law, and except for such steps as are
necessary to disseminate the Offer Documents and any other documents necessary
to consummate the Merger, Purchaser and Merger Sub and their agents shall hold
in confidence the information contained in any such labels, listings and files,
shall use such information only in connection with the Offer and the Merger and,
if this Agreement shall be terminated, shall, upon request, promptly deliver,
and shall cause their agents promptly to deliver, to the Company all copies of
such information then in their possession or control.

          SECTION 1.3. Directors.  Promptly upon the acceptance for payment of,
and payment for, any Shares by Merger Sub pursuant to the Offer and, from time
to time thereafter, Merger Sub shall be entitled to designate such number of
directors on the Board of Directors of the Company as will give Merger Sub,
subject to compliance with Section 14(f) of the Exchange Act and subject to the
final sentence of this Section 1.3, representation on the Board equal to at
<PAGE>
 
                                     -11-

least that number of directors (rounded up to the next whole number) equal to
the product of (i) the total number of directors on the Board and (ii) the
percentage that the number of Shares owned by Merger Sub bears to the number of
Shares outstanding, and the Company shall, at such time, cause Merger Sub's
designees to be so elected or appointed to the Board of Directors of the
Company.  Subject to applicable law, the Company shall take all action requested
by Purchaser necessary to effect any such election, including mailing to its
stockholders the information statement (as amended from time to time, the
"Information Statement") containing the information required by Section 14(f) of
the Exchange Act and Rule 14f-1 promulgated thereunder, and the Company agrees
to make such mailing with the mailing of the Schedule 14D-9 (provided that
Merger Sub shall have provided to the Company on a timely basis in writing all
information required to be included in the Information Statement with respect to
Merger Sub's designees).  In connection with the foregoing, the Company will
promptly, at the option of Purchaser, either increase the size of the Company's
Board of Directors and/or use its commercially reasonable efforts to obtain the
resignation of such number of its current directors as is necessary to enable
Merger Sub's designees to be elected or appointed to the Company's Board of
Directors as provided above.  In addition, subject to applicable law, at such
time as Merger Sub shall be entitled to designate a number of directors as
provided by this Section 1.3, at the request of Purchaser, the Company will use
its best efforts to cause individuals designated by Merger Sub to constitute the
same percentage as such individuals represent on the Board of Directors of
(x)__each committee of the Board of Directors, (y)__each board of directors of
each Subsidiary (as defined below) of the Company and (z)__each committee of
each such board. Notwithstanding the foregoing, until the Effective Time (as
defined in Section 2.3 hereof), there shall be at least two directors who are
directors on the date hereof and who are not designees nor officers, directors,
employees or affiliates of Purchaser or Merger Sub nor officers or employees of
the Company or Parent ("Independent Directors"), provided that if the number of
Independent Directors shall be reduced below two for any reason, the Board of
Directors shall, subject to the approval of the remaining Independent Directors
(or Independent Director, if there be only one remaining), if any, designate a
person or persons to fill the vacancy or vacancies who are not designees nor
officers, directors, employees or affiliates of Purchaser or Merger Sub nor
officers or employees of the Company, and such persons shall be deemed to be
Independent Directors for purposes of this Agreement.

                                   ARTICLE II
                                   THE MERGER

          SECTION 2.1. The Merger.  Upon the terms and subject to the conditions
set forth in this Agreement, and in accordance with the DGCL, Merger Sub shall
be merged with and into the Company at the Effective Time (as defined in Section
2.3).  Following the Effective Time, the separate corporate existence of Merger
Sub shall cease and the Company shall continue as the surviving corporation (the
"Surviving Corporation") and shall succeed to and 
<PAGE>
 
                                     -12-

assume all the rights and obligations of Merger Sub in accordance with the DGCL.
At the election of Purchaser, any direct or indirect wholly owned subsidiary of
Purchaser may be substituted for Merger Sub as a constituent corporation in the
Merger, provided that no such substitution shall be made if it would materially
delay or impede the transactions contemplated hereby. In such event, the parties
agree to execute an appropriate amendment to this Agreement in order to reflect
the foregoing.

          SECTION 2.2. Closing.  The closing of the Merger will take place at
10:00 a.m. (Houston time) on a date to be specified by Purchaser or Merger Sub,
which shall be no later than the second business day after satisfaction or
waiver of the conditions set forth in Article VIII (the "Closing Date"), at the
offices of Baker & Botts, L.L.P., One Shell Plaza, 910 Louisiana Street,
Houston, Texas, unless another date, time or place is agreed to in writing by
the parties hereto.

          SECTION 2.3. Effective Time.  Subject to the provisions of this
Agreement, on the Closing Date the parties shall file a certificate of merger
or, if applicable, certificate of ownership and merger (in any such case, the
"Certificate of Merger") executed in accordance with the relevant provisions of
the DGCL and shall make all other filings or recordings required under the DGCL
and other applicable law.  The Merger shall become effective at such time as the
Certificate of Merger is duly filed with the Delaware Secretary of State, or at
such other time specified in the Certificate of Merger as Merger Sub and the
Company shall agree (the time the Merger becomes effective being hereinafter
referred to as the "Effective Time").

          SECTION 2.4. Effects of the Merger.  The Merger shall have the effects
set forth in Section 259 of the DGCL.

          SECTION 2.5. Certificate of Incorporation and By-laws.  (a)  The
Certificate of Incorporation of the Company (the "Certificate of
Incorporation"), as in effect immediately prior to the Effective Time, shall be
the certificate of incorporation of the Surviving Corporation until thereafter
changed or amended as provided therein or by applicable law.

          (b) The By-laws of Merger Sub 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 applicable law.

          SECTION 2.6. Directors.  The directors of Merger Sub immediately prior
to the Effective Time shall be the directors of the Surviving Corporation, until
the earlier of their resignation or removal or until their respective successors
are duly elected and qualified, as the case may be.

          SECTION 2.7. Officers.  The officers of Merger Sub immediately prior
to the Effective Time shall be the officers of the Surviving Corporation, until
the earlier of their resignation or removal or until their respective successors
are duly elected and qualified, as the case may be.
<PAGE>
 
                                     -13-

                                  ARTICLE III
                            CONVERSION OF SECURITIES

          SECTION 3.1. Effect on Capital Stock.  As of the Effective Time, by
virtue of the Merger and without any action on the part of Purchaser, Merger Sub
or the Company or any holder of any of the following securities:

          (a) Capital Stock of Merger Sub.  Each share of capital stock of
Merger Sub which is issued and outstanding immediately prior to the Effective
Time shall be converted into and become one fully paid and nonassessable share
of Common Stock, par value $1.00 per share, of the Surviving Corporation.

          (b) Cancellation of Treasury Stock and Purchaser Owned Stock.  Each
Share which immediately prior to the Effective Time is held in the treasury of
the Company or owned by Purchaser, Merger Sub or any other subsidiary of
Purchaser shall automatically be canceled and retired and shall cease to exist,
and no consideration shall be delivered in exchange therefor.

          (c) Conversion of Company Common Stock.  Subject to Section 3.1(d)
hereof, each Share issued and outstanding immediately prior to the Effective
Time (other than Shares to be canceled in accordance with Section 3.1(b) hereof)
shall be converted into the right to receive from the Surviving Corporation an
amount in cash equal to the price per Share paid in the Offer, without interest
thereon (the "Merger Consideration").  As of the Effective Time, all such Shares
shall no longer be outstanding and shall automatically be canceled and shall
cease to exist, and each holder of a certificate representing any such Shares
shall cease to have any rights with respect thereto, except the right to receive
the Merger Consideration, without interest.

          (d) Shares of Dissenting Stockholders.  Notwithstanding anything in
this Agreement to the contrary, each Share issued and outstanding immediately
prior to the Effective Time and held by a person (a "Dissenting Stockholder")
who has neither voted in favor of the Merger nor consented in writing thereto
and who otherwise complies with all the applicable provisions of the DGCL
concerning the right of holders of Company Common Stock to require appraisal of
their Shares ("Dissenting Shares") shall not be converted as described in
Section 3.1(c) hereof but shall become the right to receive such consideration
as may be determined to be due to such Dissenting Stockholder pursuant to the
laws of the State of Delaware.  If, after the Effective Time, such Dissenting
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 Shares shall
be deemed to be converted as of the Effective Time into the right to receive the
Merger Consideration. The Company shall give Purchaser (i)__prompt notice of any
demands for appraisal of Shares received by the Company and (ii)__the
opportunity to participate in and direct all negotiations and proceedings with
respect to any such demands. The Company shall not, without the prior written
consent of Purchaser, make any payment with respect to, or settle, offer to
settle or otherwise negotiate, any such demands.

          (e) Withholding Tax.  The right of any stockholder to receive a
distribution of the Merger Consideration shall be subject to and reduced by the
amount of any required tax withholding obligation.
<PAGE>
 
                                     -14-

          SECTION 3.2. Exchange of Certificates.  (a)__Paying Agent.  Prior to
the Effective Time, Purchaser shall (with the approval of the Company, which
approval shall not be unreasonably withheld) designate a bank or trust company
to act as paying agent in the Merger (the "Paying Agent").  Purchaser shall
deposit or cause the Surviving Corporation to deposit with the Paying Agent in
separate trust for holders of the Certificates (as hereinafter defined)
immediately available funds in an amount sufficient for the payment of the
aggregate Merger Consideration upon surrender of Certificates (as hereinafter
defined) representing Shares converted pursuant to Section 3.1(c) hereof (it
being understood that any and all interest earned on funds made available to the
Paying Agent pursuant to this Agreement shall be turned over to Purchaser).

          (b) Exchange Procedure.  Promptly after the Effective Time, Purchaser
shall cause to be mailed to each holder of record of a certificate or
certificates that immediately prior to the Effective Time represented Shares
(the "Certificates"), (i)__a letter of transmittal (which shall specify that
delivery shall be effected, and risk of loss and title to the Certificates shall
pass, only upon delivery of the Certificates to the Paying Agent and shall be in
a form and have such other provisions as Purchaser may reasonably specify) and
(ii)__instructions for use in effecting the surrender of the Certificates in
exchange for the Merger Consideration.  Upon surrender of a Certificate for
cancellation to the Paying Agent or to such other agent or agents as may be
appointed by Purchaser, together with such letter of transmittal, duly executed,
and such other documents as may reasonably be required by the Paying Agent, the
holder of such Certificate shall be entitled to receive in exchange therefor,
and the Paying Agent shall pay pursuant to irrevocable instructions given by
Merger Sub or Purchaser, the Merger Consideration for each Share formerly
evidenced by such Certificate, and such Certificate shall thereupon be canceled.
If payment of the Merger Consideration is to be made to a person other than the
person in whose name the surrendered Certificate is registered on the stock
transfer books of the Company, it shall be a condition of payment to the holder
of a Certificate that it be endorsed properly or otherwise be in proper form for
transfer and that the person requesting such payment shall have paid all
transfer and other taxes required by reason of the payment of the Merger
Consideration to a person other than the registered holder thereof or shall have
established to the satisfaction of the Surviving Corporation that such taxes are
not applicable.  Until surrendered as contemplated by this Section 3.2, each
Certificate shall be deemed at any time after the Effective Time to represent
only the right to receive upon such surrender the Merger Consideration into
which the Shares theretofore represented by such Certificate shall have been
converted pursuant to Section 3.1 hereof.  No interest will be paid or will
accrue on the cash payable upon the surrender of any Certificate.

          (c) Stock Transfer Books.  At the close of business on the day of the
Effective Time, the stock transfer books of the Company shall be closed and,
thereafter, there shall be no 
<PAGE>
 
                                     -15-

further registration of transfers of Shares on the records of the Company. If,
after the Effective Time, Certificates are presented to the Surviving
Corporation or the Paying Agent for any reason, they shall be canceled and
exchanged as provided in this Article III. All cash paid upon the surrender of
Certificates in accordance with the terms of this Article III shall be deemed to
have been paid in full satisfaction of all rights pertaining to the Shares
theretofore represented by such Certificates.

          (d) No Liability.  None of Purchaser, Merger Sub, the Company or the
Paying Agent shall be liable to any person in respect of any cash delivered to a
public official pursuant to any applicable abandoned property, escheat or
similar law.

                                   ARTICLE IV
                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY

          The Company represents and warrants to each of Purchaser and Merger
Sub that, except as set forth in the Disclosure Letter delivered by the Company
to Purchaser and Merger Sub concurrently with the execution and delivery of this
Agreement (the "Disclosure Letter"):

          SECTION 4.1. Organization.  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 authority to carry on its
business as now being conducted.  The Company is duly qualified to do business
and in good standing in each jurisdiction where qualification as a foreign
corporation is necessary, except in such jurisdictions where the failure to be
so duly qualified and in good standing, when taken together with all other such
failures of the Company and its Subsidiaries (as defined in Section 4.2 hereof),
would not have a material adverse effect (as defined in Section 10.3 hereof) on
the Company and its Subsidiaries taken as a whole or prevent or materially delay
the consummation of the Offer and/or the Merger.  The Company has made available
to Purchaser complete and correct copies of its Certificate of Incorporation and
By-laws, as amended to the date of this Agreement.

          SECTION 4.2. Subsidiaries.  Each "significant subsidiary" (as defined
in Rule 1-02(v) of Regulation S-X of the SEC) of the Company (a "Subsidiary") is
listed in the Disclosure Letter.  Each of the Subsidiaries is a corporation,
partnership or other business entity (as the case may be) duly organized,
validly existing and in good standing under the laws of the jurisdiction of its
incorporation or organization, as applicable, and has all requisite corporate,
partnership or similar (as the case may be) power and authority to carry on its
business as now being conducted.  Each of the Subsidiaries is duly qualified to
do business and in good standing in each jurisdiction where qualification as a
foreign corporation, partnership or other business entity (as the case may be)
is necessary, except in such jurisdictions where the failure to be so duly
qualified and in good standing, when taken together with all other such failures
of the Company and its Subsidiaries, would not have a material adverse effect on
the Company and its Subsidiaries taken as a whole or prevent or materially delay
the consummation of the Offer and/or the Merger.
<PAGE>
 
                                     -16-

          SECTION 4.3. Capitalization.  (a) The authorized capital stock of the
Company consists of 250,000,000 shares of Company Common Stock.  At the close of
business on June 16, 1998, (i) 97,393,822 Shares were issued and outstanding,
(ii) 2,156,179 shares of Company Common Stock were held by the Company in its
treasury, and (iii) 2,507,990 shares of Company Common Stock were reserved for
issuance under outstanding Company Stock Options (as defined in Section 7.4
hereof), and contingent and performance-based restricted stock.  All outstanding
Shares are, and all Shares which may be issued will be, when issued, duly
authorized, validly issued, fully paid and nonassessable.  There are no bonds,
debentures, notes or other indebtedness of the Company having the right to vote
(or convertible into, or exchangeable for, securities having the right to vote)
on any matters on which stockholders of the Company may vote.  Except for the
Company Stock Options, DSCs (as defined in Section 7.4 hereof) and contingent
and performance-based restricted stock granted on or prior to March 31, 1998
under any stock option or incentive plan of the Company, and outstanding as of
the date of this Agreement, there are not any securities, options, warrants,
calls, rights, commitments, agreements, arrangements or undertakings of any kind
to which the Company or any of its Subsidiaries is a party or by which it is
bound obligating the Company or any of its Subsidiaries to issue, deliver or
sell, or cause to be issued, delivered or sold, additional shares of capital
stock or other voting securities of the Company or any of its Subsidiaries or
obligating the Company or any of its Subsidiaries to issue, grant, extend or
enter into any such security, option, warrant, call, right, commitment,
agreement, arrangement or undertaking.  As of the date of this Agreement, there
are not any outstanding contractual obligations of the Company or any of its
Subsidiaries to repurchase, redeem or otherwise acquire any shares of capital
stock of the Company or any of its Subsidiaries.

          (b) The Company will make available immediately following the date of
this Agreement the certificates of incorporation and by-laws or other
organizational documents of its Subsidiaries, in each case as amended to the
date of this Agreement.  The respective certificates of incorporation and by-
laws or other organizational documents of the Subsidiaries of the Company do not
contain any provision limiting or otherwise restricting the ability of the
Company to control such Subsidiaries.  Except as set forth in the Disclosure
Letter, all of the outstanding shares of capital stock of the Subsidiaries are
beneficially owned by the Company (or by another wholly owned Subsidiary of the
Company or by the Company and another wholly owned subsidiary of the Company)
free and clear of any lien, charge, encumbrance or claim of whatever nature and
are duly authorized, validly issued, fully paid and nonassessable.  There are
not any securities, options, warrants, calls, rights, commitments, agreements,
arrangements or undertakings of any kind to which any Subsidiary is a party or
by which any Subsidiary is bound obligating such Subsidiary to issue, deliver or
sell, or cause to be issued, delivered or sold, additional shares of capital
stock or other voting securities of such Subsidiary or obligating such
Subsidiary to issue, grant, extend or enter into any such security, option,
warrant, call, right, commitment, agreement, arrangement or undertaking.
<PAGE>
 
                                     -17-

          SECTION 4.4. Authority.  The Company has the requisite corporate power
and authority to execute and deliver this Agreement and to consummate the
transactions contemplated hereby (other than, with respect to the Merger, the
approval and adoption of this Agreement by the holders of a majority of the
Shares (the "Company Stockholder Approval"), if any such approval is required by
the DGCL).  The execution, delivery and performance of this Agreement and the
consummation by the Company of the Merger and of the other transactions
contemplated hereby 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 are necessary to authorize this Agreement or to consummate the
transactions so contemplated (in each case, other than, with respect to the
Merger, the Company Stockholder Approval, if required by the DGCL).  This
Agreement has been duly executed and delivered by the Company and, assuming this
Agreement constitutes a valid and binding obligation of Purchaser and Merger
Sub, constitutes a valid and binding obligation of the Company enforceable
against the Company in accordance with its terms, subject to the effect of any
applicable bankruptcy, reorganization, insolvency, moratorium or similar laws
affecting creditors' rights generally and subject, as to enforceability, to the
effect of general principles of equity (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

          SECTION 4.5. Consents and Approvals; No Violations.  Except for
filings, permits, authorizations, consents and approvals as may be required
under, and other applicable requirements of, the Exchange Act (including the
filing with the SEC of the Schedule 14D-9 and a proxy or information statement
relating to any required approval by the Company's stockholders of this
Agreement (the "Proxy Statement")), the Hart-Scott-Rodino Antitrust Improvements
Act of 1976, as amended (the "HSR Act"), the DGCL, foreign and state antitrust
and competition laws (as set forth in the Disclosure Letter) of jurisdictions in
which the Company or any of its Subsidiaries is qualified to do or is doing
business, state takeover laws, and the rules of the New York Stock Exchange
("NYSE"), neither the execution, delivery or performance of this Agreement by
the Company nor the consummation by the Company of the transactions contemplated
hereby will (i) conflict with or result in any breach of any provision of the
Certificate of Incorporation or By-laws of the Company or any of its
Subsidiaries, (ii) require any filing with, or permit, authorization, consent or
approval of, any Federal, state or local government or any court, tribunal,
administrative agency or commission or other governmental or other regulatory
authority or agency, domestic, foreign or supranational (a "Governmental
Entity") (except where the failure to obtain such permits, authorizations,
consents or approvals or to make such filings would not have a material adverse
effect on the Company and its Subsidiaries taken as a whole or prevent or
materially delay the consummation of the Offer and/or the Merger), (iii) result
in a violation or breach of, or constitute (with or without due notice or lapse
of time or both) a default (or give rise to any right of termination, 
<PAGE>
 
                                     -18-

amendment, cancellation or acceleration) under, any of the terms, conditions or
provisions of any note, bond, mortgage, indenture, lease, license, contract,
agreement or other instrument or obligation to which the Company or any of its
Subsidiaries is a party or by which it or any of its properties or assets may be
bound or (iv) violate any order, writ, injunction, decree, statute, rule or
regulation applicable to the Company, any of its Subsidiaries or any of their
respective properties or assets, except in the case of clauses (iii) or (iv) for
violations, breaches, defaults or terminations that would not have a material
adverse effect on the Company and its Subsidiaries taken as a whole or prevent
or materially delay the consummation of the Offer and/or the Merger.

          SECTION 4.6. SEC Documents; Financial Statements.  The Company has
filed with the SEC all reports, forms, schedules and statements and other
documents required to be filed by it since January 1, 1996 (the "SEC
Documents"). As of their respective filing dates, (i) the SEC Documents complied
in all material respects with the requirements of the Securities Act of 1933, as
amended (the "Securities Act"), or the Exchange Act, as the case may be, and the
rules and regulations of the SEC promulgated thereunder applicable to such SEC
Documents, and (ii) none of the SEC Documents 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, in light of the
circumstances under which they were made, not misleading.  The financial
statements of the Company included in the SEC Documents comply as to form in all
material respects with applicable accounting requirements and the published
rules and regulations of the SEC with respect thereto, have been prepared in
accordance with generally accepted accounting principles (except, in the case of
unaudited statements, as permitted by Form 10-Q of the SEC) applied on a
consistent basis during the periods involved (except as may be indicated in the
notes thereto) and fairly present, in all material respects, the consolidated
financial position of the Company as of the dates thereof and the results of its
operations and cash flows for the periods then ended (subject, in the case of
unaudited statements, to normal year-end audit adjustments).

          SECTION 4.7. Information Supplied.  None of the information supplied
or to be supplied by the Company in writing for inclusion or incorporation by
reference in (i) the Offer Documents, (ii) the Schedule 14D-9, (iii) the
Information Statement or (iv) the Proxy Statement, will, in the case of the
Offer Documents, the Schedule 14D-9 and the Information Statement at the
respective times the Offer Documents, the Schedule 14D-9 and the Information
Statement are filed with the SEC or first published, sent or given to the
Company's stockholders, or in the case of the Proxy Statement, at the time the
Proxy Statement is first mailed to the Company's stockholders or at the time of
the Stockholders Meeting (as defined in Section 7.1 hereof), as such Proxy
Statement may be amended or supplemented, 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, in light of the
circumstances under which they are made, not misleading.  The Schedule 14D-9,
the Information Statement and the Proxy 
<PAGE>
 
                                     -19-

Statement will comply as to form in all material respects with the requirements
of the Exchange Act and the rules and regulations thereunder, 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
Purchaser or Merger Sub specifically for inclusion or incorporation by reference
therein.

          SECTION 4.8. Absence of Certain Changes or Events.  Except as
disclosed in the SEC Documents (including exhibits thereto) filed and publicly
available prior to the date of this Agreement and the proof dated June 13, 1998
of Amendment No. 1 to the Registration Statement on Form S-3 of the Company
(Registration No. 333-55883) (the "S-3 Amendment") in the form heretofore
delivered to Purchaser (the "Filed SEC Documents"), or in the Disclosure Letter,
from the date of the most recent audited financial statements included in the
Filed SEC Documents to the date of this Agreement, the Company and each of its
Subsidiaries has conducted its business only in the ordinary course and there
has not been (i) any material adverse effect on the Company and its Subsidiaries
taken as a whole, (ii) any event or occurrence that would have a material
adverse effect on the Company and its Subsidiaries taken as a whole, (iii) any
declaration, setting aside or payment of any dividends or distributions in
respect of the Shares other than the regular quarterly dividend in the amount of
$0.70 per Share, (iv) any split, combinations or reclassification of any of its
capital stock 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 its
capital stock, (v) except as contemplated by Section 7.4 hereof, (A) any
granting by the Company or any of its Subsidiaries to any executive officer of
the Company or any of its Subsidiaries of any increase in compensation, except
as was required under employment agreements or benefit plans in effect as of the
date of the most recent audited financial statements included in the Filed SEC
Documents, (B) any granting by the Company or any of its Subsidiaries to any
such officer of any increase in severance or termination pay, except as was
required under employment, severance or termination agreements in effect as of
the date of the most recent audited financial statements included in the Filed
SEC Documents, (C) any entry by the Company or any of its Subsidiaries into any
employment, severance or termination agreement or arrangement with any officer
or employee or (D) any increase in benefits available under or establishment of
any Benefit Plan (as defined in Section 4.10) (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), except in the ordinary course of business consistent with past
practice, (vi) any damage, destruction or loss to physical properties owned or
used by the Company, whether or not covered by insurance, that would have a
material adverse effect on the Company and its Subsidiaries, taken as a whole,
(vii) any revaluation by the Company of any of its material assets,
(viii) except as provided in Section 7.4, any actual or approved acceleration of
vesting or conversion of contingent restricted shares of stock or other
<PAGE>
 
                                     -20-

amendment to or modification of outstanding Company Stock Options, DSCs, phantom
stock units or contingent of performance-based restricted stock, or (ix) any
material change by the Company in its accounting principles or practices except
insofar as may have been required by a change in generally accepted accounting
principles.  Except as and to the extent set forth in the Company's Annual
Report on Form 10-K for the year ended December 31, 1997, or in any subsequent
Filed SEC Document or the Disclosure Letter, neither the Company nor any of its
Subsidiaries has any liabilities or obligations of any nature, whether or not
accrued, contingent or otherwise, that would be required by generally accepted
accounting principles to be reflected on a consolidated balance sheet of the
Company and its Subsidiaries (including the notes thereto), except for
liabilities or obligations incurred in the ordinary course of business since
December 31, 1997, that would not, individually or in the aggregate, have a
material adverse effect.

          SECTION 4.9. Litigation.  Except as disclosed in the Filed SEC
Documents, there is no suit, action or proceeding pending or, to the knowledge
of the Company, threatened against or affecting the Company or any of its
Subsidiaries that, individually or in the aggregate, would have a material
adverse effect on the Company and its Subsidiaries taken as a whole, or prevent
or materially delay the consummation of the Offer and/or the Merger, nor is
there any judgment, decree, injunction, rule or order of any Governmental Entity
or arbitrator outstanding against the Company or any of its Subsidiaries having
any such effect.

          SECTION 4.10.  Benefit Plans and Matters.  (a) (i) Each employee
benefit plan as defined in Section 3(3) of the Employee Retirement Income
Security Act of 1974, as amended ("ERISA"), maintained by the Company which is
required to comply with ERISA ("Employee Plans") complies in all material
respects with all applicable requirements of ERISA and of the Internal Revenue
Code of 1986, as amended (the "Code"), and other applicable laws.  To the
knowledge of the Company, no "reportable event" or "prohibited transaction" (as
such terms are defined in ERISA) or termination has occurred with respect to any
such plan which may result in liability to any Governmental Entity or other
person which would have a material adverse effect on the Company and its
Subsidiaries taken as a whole.  Each Employee Plan that is intended to be
qualified under Section 401(a) of the Code currently has a favorable
determination letter from the Internal Revenue Service as to that Plan's
qualification under Section 401(a) of the Code and nothing has occurred since
the date of such letter that could reasonably be expected to cause the loss of
such qualification.

          (ii) The Company has in all material respects performed all
     obligations required to be performed by it under ERISA, the Code and any
     other applicable legal requirements and under the terms of each Employee
     Plan.  The Company has not received any written notice of the existence of
     any material default or violation by any other party of any of such legal
     requirements or terms applicable to any of the Employee Plans.
<PAGE>
 
                                     -21-

          (iii)  Other than routine claims for benefits, the Company has not
     received any written notice of any pending material claims or lawsuits
     which have been asserted or instituted against any of the Employee Plans,
     the assets of the trust or funds under the Employee Plans, the sponsor or
     administrator of any of the Employee Plans, or against any fiduciary of any
     of the Employee Plans with respect to the operation of such Plan.

          (iv) The Company has not received any written notice of any pending
     investigation or pending enforcement action by the Pension Benefit Guaranty
     Corporation, the Department of Labor, the Internal Revenue Service or any
     other Governmental Entity with respect to any of the Employee Plans.

          (v) To the best knowledge of the Company, all contributions required
     to be made under the terms of the Employee Plans have been timely made.  No
     Employee Plan has an "accumulated funding deficiency" (within the meaning
     of section 412 of the Code or Section 302 of ERISA).

          (vi) The cash value of the corporate-owned life insurance policies and
     other assets held in the Supplemental Executive Benefit Plans Trust
     Agreement equals or exceeds the ABO liability of the Company under all
     plans funded by such Trust, assuming for purposes of calculating such cash
     value, that any corporate-owned life insurance policies are canceled.
     Within 30 days after the date hereof, the Company will provide to Purchaser
     a currently dated actuarial report and valuation prepared by Mullin
     Consulting Inc., based on reasonable assumptions, evidencing the foregoing.

          (b) Each of the Company's "group health plans" (within the meaning of
Code Section 5000(b)(1)) have been operated in substantial compliance with the
group health plan continuation coverage requirements of Section 4980B of the
Code and Sections 601 through 608 of ERISA, Title XXII of the Public Health
Service Act and the provisions of the Social Security Act.

          (c) To the best knowledge of the Company, there has been no act or
omission by the Company that has given rise to or may give rise to material
fines, penalties, taxes, or related charges under Section 502(c), (i) or (1) or
Section 4071 of ERISA or Chapter 43 of the Code or the imposition of a lien
pursuant to Sections 401(a)(29) or 412(n) of the Code or pursuant to ERISA.

          (d) True and complete copies of the following documents with respect
to each of the Employee Plans and other employee benefit plans, programs,
policies or arrangements maintained by the Company for domestic or international
employees (as applicable) have been delivered by the Company to Purchaser: (i)
any current written plans, related trust documents and group annuity contracts,
if any, and all amendments thereto (or, if no written plan document exists, a
written description of the terms of the plan), (ii) the most recent summary plan
description, and (iii) the most recent actuarial report, valuation and/or trust
statement relating to such plan.
<PAGE>
 
                                     -22-

          (e) Except as provided in the Company's Change of Control Plan
adopted effective on February 19, 1998 (the "Change of Control Plan") with
respect to not more than 12 employees, neither the Company nor any of its
Subsidiaries is a party to or obligated under any agreement, plan, contract or
other arrangement pursuant to which the Company, any Subsidiary or Purchaser is
or might be required to make payments that would not be deductible for federal
income tax purposes by reason of the application of Section 280G of the Code.

          SECTION 4.11.  Compliance with Laws.  Except as disclosed in the Filed
SEC Documents, the Company and its Subsidiaries are in compliance with all
applicable statutes, laws, ordinances, regulations, rules, judgments, decrees
and orders of any Governmental Entity applicable to their respective business or
operations, except for instances of actual or possible noncompliance that,
individually or in the aggregate, would not have a material adverse effect on
the Company and its Subsidiaries taken as a whole or prevent or materially delay
the consummation of the Offer and/or the Merger.  As of the date of this
Agreement, no investigation or review by any Governmental Entity with respect to
the Company or any of its Subsidiaries is pending or, to the best knowledge of
the Company, threatened, nor has any Governmental Entity indicated an intention
to conduct any such investigation or review, other than, in each case, those the
outcome of which would not be reasonably expected to have a material adverse
effect on the Company and its Subsidiaries taken as a whole or prevent or
materially delay the consummation of the Offer or the Merger.

          SECTION 4.12.  Environmental Matters.  Except as disclosed in the
Filed SEC Documents or as would not, individually or in the aggregate, have a
material adverse effect on the Company and its Subsidiaries taken as a whole:
(i) the Company and each of its Subsidiaries is in compliance with all
applicable Environmental Laws (as defined below); (ii) the Company and each of
its Subsidiaries has all permits, authorizations and approvals required under
any applicable Environmental Laws and is in compliance with their respective
requirements; (iii) to the knowledge of the Company and its Subsidiaries, there
are no pending or threatened claims against or governmental investigations
involving the Company or any of its Subsidiaries alleging a violation of or
response or remedial requirements under Environmental Laws; and (iv) to the
knowledge of the Company and its Subsidiaries, under applicable law, there are
no circumstances with respect to any current or former property or operations of
the Company or any of its Subsidiaries or of any entity for which any of them
have assumed liability that would form the basis of a claim against the Company
or any of its Subsidiaries alleging a material violation of Environmental Laws
that would have a material adverse effect on the Company and its Subsidiaries,
taken as a whole.  As used herein, "Environmental Laws" means any and all
applicable foreign, Federal, state or local statutes, laws (including, with
respect to clauses (iii) and (iv) above, common law), regulations, ordinances,
rules or codes now in effect relating to the environment, or protection of
public or employee health, safety or welfare or to the use, generation,
manufacturing, treatment, disposal, storage, transportation, discharge, release
or 
<PAGE>
 
                                     -23-

emission of any hazardous, toxic or radioactive substance, including
petroleum and its derivatives, into the environment, including but not limited
to ambient air, indoor air, surface water, groundwater or land, or the
remediation thereof, including without limitation the Comprehensive
Environmental Response, Compensation and Liability Act, in each case as amended
and in effect as of the date hereof.  There are no matters relating to
Environmental Laws required under applicable laws to be disclosed in the Filed
SEC Documents that have not been disclosed therein.

          SECTION 4.13.  Taxes.  The Company and its Subsidiaries have filed all
material tax returns and reports required to be filed by them, or, in the case
of consolidated returns, such returns have been filed by Parent, and have paid
all material taxes due and required to be paid by them.  All such tax returns
and reports are true and correct in all material respects.  The most recent
financial statements contained in the Filed SEC Documents reflect an adequate
reserve for all taxes payable by the Company for all taxable periods and
portions thereof through the date of such financial statements, except for such
taxes as to which the failure to pay, individually or in the aggregate, would
not have a material adverse effect on the Company and its Subsidiaries taken as
a whole.  No deficiencies for any taxes which remain outstanding have been
proposed, asserted or assessed against the Company or any of its Subsidiaries
except for such taxes as to which such deficiency, individually or in the
aggregate, would not have a material adverse effect on the Company and its
Subsidiaries taken as a whole.  As used herein, "taxes" shall mean all Federal,
state, local and foreign income, property, sales, excise and other taxes,
tariffs or other governmental charges in the nature of a tax as well as any
interest, penalties and additions to tax.

          SECTION 4.14.  Technology and Intellectual Property.  Except as
provided in Section 6.3 and except as would not have a material adverse effect
on the Company and its Subsidiaries, taken as a whole, the Company and its
Subsidiaries own or have valid licenses or otherwise have the right to make,
have made, use, have used, and sell products resulting therefrom, all material
technology, technology rights, patents, patent rights, trade secrets, trade
secret rights, trademarks, trademark rights, trade names, trade name rights,
service marks, service mark rights, trade dress, trade dress rights, copyrights
and other proprietary intellectual property rights that are employed or
necessary in the conduct of their respective business as now operated
(collectively, "Technology and Intellectual Property Rights"), and to transfer
Technology and Intellectual Property Rights pursuant to the terms and conditions
of this Agreement.  No claims are final, pending or, to the knowledge of the
Company and its Subsidiaries, threatened that the Company or any of its
Subsidiaries is infringing or otherwise adversely affecting the rights of any
person, company or other entity with regard to any Technology and Intellectual
Property Right that would have a material adverse effect on the Company and its
Subsidiaries, taken as a whole.  To the knowledge of the Company and its
Subsidiaries, no person, company or other entity is infringing the rights of the
Company or any of its Subsidiaries with respect to any Technology and
Intellectual Property Right.
<PAGE>
 
                                     -24-

          SECTION 4.15.  Opinion of Financial Advisor.  The Board of Directors
of the Company has received the opinion dated June 18, 1998 of Merrill Lynch,
Pierce, Fenner & Smith Incorporated ("Merrill Lynch"), that, as of such date and
based upon and subject to the matters set forth therein, the consideration to be
received by holders of Shares (other than Parent) pursuant to the Offer and the
Merger was fair from a financial point of view to such holders, a final draft of
which opinion has been delivered to Purchaser.  Each of Purchaser and Merger Sub
acknowledges and agrees that it may not, and is not entitled to, rely on the
opinion of Merrill Lynch delivered to the Board of Directors of the Company.

          SECTION 4.16.  Brokers; Schedule of Fees and Expenses.  No broker,
investment banker, financial advisor or other person, other than Merrill Lynch,
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 the Company.  The estimated fees and expenses
incurred and to be incurred by the Company in connection with this Agreement and
the transactions contemplated by this Agreement (including the fees of the
Company's legal counsel and the legal counsel for its financial advisor) are set
forth in the Disclosure Letter.  The Company has provided Purchaser true and
correct copies of all agreements between the Company and Merrill Lynch.

          SECTION 4.17.  Affiliated Written Transactions.  Section 4.17 of the
Disclosure Letter sets forth a complete and accurate list of all contracts,
agreements, leases, licenses and other arrangements as of the date of this
Agreement to which Parent or any of its Subsidiaries (other than the Company and
its Subsidiaries), on the one hand, and the Company or any of its Subsidiaries,
on the other hand, is a party or by which the Company or any of its Subsidiaries
is bound involving more than $5 million per annum, but excluding any such
contracts solely with respect to any indebtedness between Parent or any of its
Subsidiaries (other than the Company and its Subsidiaries), on the one hand, and
the Company or any of its Subsidiaries, on the other hand.  The Company has
furnished to Purchaser copies of all such items that are listed in Section 4.17
of the Disclosure Letter.

          SECTION 4.18.  State Takeover Statutes.  No state takeover statute or
similar statute or regulations (except for Section 203 of the DGCL) applies or
purports to apply to the Offer, the Merger, this Agreement or any of the
transactions contemplated by this Agreement other than any of the foregoing that
would not prevent or materially delay the consummation of the Offer or the
Merger, provided that the Purchaser, Merger Sub and the Company use reasonable
commercial efforts to comply with and/or contest the applicability or
constitutionality of any such statute or regulation.

          SECTION 4.19.  Title.  With such exceptions as would not in the
aggregate have a material adverse affect on the Company and its Subsidiaries,
each of the Company and its Subsidiaries has good and valid title to all of
their respective properties and assets free and clear 
<PAGE>
 
                                     -25-

of all Liens except Permitted Liens (as defined below). For purposes of this
Agreement, "Lien" means any lien (including any tax lien), mortgage or security
interest, defect in title or encumbrance, and "Permitted Liens" means (i) Liens
for taxes not yet due and payable, that are payable without penalty or that are
being contested in good faith and for which proper reserves have been taken,
(ii) inchoate mechanic and materialmen liens for construction in progress, and
(iii) inchoate workmen, repairmen, warehousemen, customer, employee and carriers
liens arising in the ordinary course of business, in each case with respect to
obligations or claims which are either not delinquent or are being contested in
good faith and by appropriate proceedings conducted with due diligence, (iv)
Liens arising under this Agreement or the agreements contemplated by this
Agreement, (v) zoning restrictions, easements, licenses or other restrictions on
the use of real property of other minor irregularities in title thereto or
encumbrances thereon, so long as the same do not, individually or in the
aggregate, materially interfere with or impair the use of such real property in
the manner normally used, (vi) Liens arising out of judgments or awards with
respect to which at the time an appeal or proceeding for review is being
prosecuted in good faith if adequate reserves with respect thereto have been
established and are being maintained and with respect to which there shall have
been secured a stay of execution pending such appeal or proceeding for review,
and (vii) Liens and imperfections of title (including Liens created by the
operation of law) that, singly or in the aggregate, would not materially affect
the value or operation of the asset subject to such Lien in the hands of a
purchaser thereof.

                                   ARTICLE V
           REPRESENTATIONS AND WARRANTIES OF PURCHASER AND MERGER SUB

          Purchaser and Merger Sub represent and warrant to the Company as
follows:

          SECTION 5.1. Organization.  Each of Purchaser and Merger Sub 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 authority to carry on its business as now being conducted.  Each of
Purchaser and Merger Sub is duly qualified to do business and is in good
standing in each jurisdiction where qualification as a foreign corporation is
necessary, other than in such jurisdictions where the failure to be so qualified
and in good standing would not prevent or materially delay the consummation of
the Offer and/or the Merger.  Each of Purchaser and Merger Sub has delivered to
the Company complete and correct copies of its certificate of incorporation and
by-laws (or other comparable organizational documents) as amended to the date of
this Agreement.  Merger Sub is a direct wholly-owned subsidiary of Purchaser and
was formed solely for the purpose of engaging in the transactions contemplated
by this Agreement, has engaged in no other business activities and has conducted
only such operations as are required for the execution, delivery and performance
of this Agreement and the consummation of the transactions contemplated hereby.

          SECTION 5.2. Authority.  Each of Purchaser and Merger Sub has the
requisite corporate power and authority to execute and deliver this Agreement
and to consummate the 
<PAGE>
 
                                     -26-

transactions contemplated by this Agreement. The execution, delivery and
performance of this Agreement and the consummation of the transactions
contemplated by this Agreement have been duly authorized by all necessary
corporate action on the part of Purchaser and Merger Sub and no other corporate
proceedings on the part of Purchaser and Merger Sub are necessary to authorize
this Agreement or to consummate the transactions contemplated hereby or thereby.
No vote of Purchaser stockholders is required to approve this Agreement or the
transactions contemplated hereby. This Agreement has been duly executed and
delivered by Purchaser and Merger Sub, and, assuming such Agreement constitutes
a valid and binding obligation of the Company, constitutes a valid and binding
obligation of Purchaser and Merger Sub enforceable against Purchaser and Merger
Sub in accordance with its terms, subject to the effect of any applicable
bankruptcy, reorganization, insolvency, moratorium or similar laws affecting
creditors' rights generally and subject, as to enforceability, to the effect of
general principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law).

          SECTION 5.3. Consents and Approvals; No Violations.  Except for
filings, permits, authorizations, consents and approvals as may be required
under, and other applicable requirements of the Exchange Act (including the
filing with the SEC of the Offer Documents), the HSR Act, the DGCL, foreign and
state antitrust and competition laws of jurisdictions in which Purchaser or
Merger Sub is qualified to do or is doing business as set forth in Schedule 5.3
hereto, and state takeover laws neither the execution, delivery or performance
of this Agreement by Purchaser and Merger Sub, nor the consummation by Purchaser
and Merger Sub of the transactions contemplated hereby, will (i) conflict with
or result in any breach of any provision of the respective certificate of
incorporation or by-laws of Purchaser and Merger Sub, (ii) require any filing
with, or permit, authorization, consent or approval of, any Governmental Entity
(except where the failure to obtain such permits, authorizations, consents or
approvals or to make such filings would not prevent or materially delay the
consummation of the Offer and/or the Merger), (iii) result in a violation or
breach of, or constitute (with or without due notice or lapse of time or both) a
default (or give rise to any right of termination, amendment, cancellation or
acceleration) under, any of the terms, conditions or provisions of any note,
bond, mortgage, indenture, license, lease, contract, agreement or other
instrument or obligation to which Purchaser or any of its Subsidiaries is a
party or by which any of them or any of their properties or assets may be bound
or (iv) violate any order, writ, injunction, decree, statute, rule or regulation
applicable to Purchaser, any of its Subsidiaries or any of their properties or
assets, except in the case of clauses (iii) and (iv) for violations, breaches,
defaults or terminations which individually or in the aggregate, would not
prevent or materially delay the consummation of the Offer and/or the Merger.  No
filing, permit, authorization, consent or approval is required under the
European Merger Regulation No. 4064/89, as amended by Regulation No. 1310/97, in
connection with the transactions contemplated by this Agreement.

          SECTION 5.4. Information Supplied.  None of the information supplied
or to 
<PAGE>
 
                                     -27-

be supplied by Purchaser or Merger Sub specifically for inclusion or
incorporation by reference in (i) the Offer Documents, (ii) the Schedule 14D-9,
(iii) the Information Statement or (iv) the Proxy Statement will, in the case of
the Offer Documents, the Schedule 14D-9 and the Information Statement, at the
respective times the Offer Documents, the Schedule 14D-9 and the Information
Statement are filed with the SEC or first published, sent or given to the
Company's stockholders, or, in the case of the Proxy Statement, at the time the
Proxy Statement is first mailed to the Company's stockholders or at the time of
the Stockholders Meeting as such Proxy Statement may be amended or supplemented,
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, in light of the circumstances under which they are made, not
misleading.  The Offer Documents will comply in all material respects with the
requirements of the Exchange Act and the rules and regulations thereunder,
except that no representation or warranty is made by Purchaser or Merger Sub
with respect to statements made or incorporated by reference therein based on
information supplied by the Company specifically for inclusion or incorporation
by reference therein.

          SECTION 5.5. Financing.  Purchaser has obtained written commitments
that would provide sufficient funds to purchase, or to cause Merger Sub to
purchase, all of the Shares pursuant to the Offer and the Merger and to pay all
fees and expenses payable by Purchaser or Merger Sub related to the transactions
contemplated by this Agreement and has provided copies of such commitments to
the Company.  Purchaser expressly acknowledges that Purchaser's ability to
obtain financing is not a condition to the obligations of Purchaser pursuant to
the Offer and under this Agreement and the Tender and Voting Agreement.

          SECTION 5.6. Ownership of Shares.  Neither Purchaser, Merger Sub nor
any other direct or indirect subsidiary of Purchaser beneficially owns any
Shares (other than pursuant to the Tender and Voting Agreement).

          SECTION 5.7. Brokers.  No broker, investment banker, financial advisor
or other person, other than J.P. Morgan Securities, Inc., 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 Purchaser or Merger Sub.

                                   ARTICLE VI
                                   COVENANTS

          SECTION 6.1. Conduct of Business.  During the period from the date of
this Agreement until such time as Merger Sub's designees shall constitute a
majority of the Board of Directors of the Company, except as otherwise
contemplated hereby or to the extent that Purchaser shall otherwise consent in
writing, the Company shall, and shall cause its Subsidiaries to, carry on their
respective businesses in the ordinary course consistent with the manner as
heretofore conducted and, to the extent consistent therewith, use commercially
reasonable efforts 
<PAGE>
 
                                     -28-

to preserve intact their current business organization, keep available the
services of their current officers and employees and preserve their
relationships with customers, suppliers, licensors, licensees, distributors and
others having significant business dealings with them. Without limiting the
generality of the foregoing, during the period from the date of this Agreement
until such time as Merger Sub's designees shall constitute a majority of the
Board of Directors of the Company, except as expressly contemplated or permitted
by this Agreement or the Disclosure Letter, or to the extent that Purchaser
shall otherwise consent in writing, the Company shall (a) use its commercially
reasonable efforts to operate and maintain its business in all material respects
only in the usual, regular and ordinary manner consistent with past practice
(including undertaking scheduled or necessary "turnarounds" or other maintenance
work and including offsite storage, treatment and disposal of chemical
substances generated prior to such time as Merger Sub's designees shall
constitute a majority of the Board of Directors of the Company) and, to the
extent consistent with such operation and maintenance, use commercially
reasonable efforts to preserve the present business organization of its business
intact, keep available the services of, and good relations with, the present
employees and preserve present relationships with all persons having business
dealings with its business, except in each case for such matters that,
individually and in the aggregate, do not and are not reasonably likely to have
a material adverse effect on the Company and its Subsidiaries taken as a whole
and (b) except to the extent required by clause (a) of this Section 6.1, the
Company shall not, and shall not permit any of its Subsidiaries to:

          (i) (x) other than dividends and distributions by a direct or indirect
     wholly owned subsidiary of the Company to its parent and other than the
     regular quarterly dividend in respect of the Shares in the amount of $0.70
     per Share, declare, set aside or pay any dividends on, or make any other
     distributions in respect of, any of its capital stock, (y) split, combine
     or reclassify any of its capital stock or issue or authorize the issuance
     of any other securities in respect of, in lieu of or in substitution for
     shares of its capital stock, or (z) purchase, redeem or otherwise acquire
     any shares of capital stock of the Company or any of its Subsidiaries or
     any other securities thereof or any rights, warrants or options to acquire
     any such shares or other securities (other than in connection with the
     exercise of currently outstanding Company Stock Options);

          (ii) issue, deliver, sell, pledge or otherwise encumber any shares of
     its capital stock, any other voting securities or any securities
     convertible into, or any rights, warrants or options to acquire, any such
     shares, voting securities or convertible securities (other than the
     issuance of Shares upon the exercise of Company Stock Options outstanding
     on the date of this Agreement in accordance with their present terms) or as
     provided for herein;

          (iii)  amend its Certificate of Incorporation or By-laws or other
     comparable organizational documents;
<PAGE>
 
                                     -29-

          (iv) acquire or agree to acquire (y) by merging or consolidating with,
     or by purchasing a substantial portion of the assets of, or by any other
     manner, any business or any corporation (other than any subsidiary of the
     Company), partnership, joint venture, association or other business
     organization or division therefor or (z) any assets that are material,
     individually or in the aggregate, to the Company and its Subsidiaries taken
     as a whole, except acquisitions in the ordinary course of business
     consistent with past practice and acquisitions permitted by clause (vii)
     below;

          (v) sell, lease, license, mortgage or otherwise encumber or subject to
     any Lien or otherwise dispose of any of its properties or assets, which are
     material, in the aggregate, to the Company and its Subsidiaries taken as a
     whole, except (x) sales, leases or other dispositions of inventory or (y)
     sales or licenses in the ordinary course of business consistent with past
     practice which, individually, are not in excess of $5 million and, in the
     aggregate, are not in excess of $25 million;

          (vi) (y) incur any indebtedness for borrowed money (other than (i) the
     issuance or roll-over of commercial paper in the ordinary course of
     business and consistent with past practice and (ii) indebtedness to or from
     Parent that will be repaid in full prior to the expiration of the Offer),
     or guarantee any such indebtedness or issue or sell any debt securities or
     warrants or rights to acquire any debt securities of the Company or any of
     its Subsidiaries or guarantee any debt securities of others, or (z) make
     any loans, advances (other than to employees of the Company and its
     Subsidiaries in the ordinary course of business) or capital contributions
     to, or investments in, any other person (other than any subsidiary of the
     Company);

          (vii)  make or agree to make any capital expenditures regarding the
     BDO-II or PO-11 projects, other than those reasonably necessary to avoid
     payment of penalties or cancellation fees, or make or agree to make any
     other capital expenditure or expenditures with respect to property, plant
     or equipment which, individually, is in excess of $10 million or, in the
     aggregate, are in excess of $25 million other than caretaker, maintenance
     and turnaround capital expenditures in the ordinary course of business;

          (viii)  pay, discharge, settle or satisfy any material claims,
     liabilities or obligations (absolute, accrued, asserted or unasserted,
     contingent or otherwise), other than the payment, discharge or
     satisfaction, in the ordinary course of business consistent with past
     practice or in accordance with their terms, of liabilities reflected or
     reserved against in, or contemplated by, the most recent consolidated
     financial statements (or the notes thereto) of the Company included in the
     Filed SEC Documents or incurred thereafter in the ordinary course of
     business consistent with past practice, or waive any material benefits of,
     or agree to modify in any material respect, any confidentiality, standstill
     or similar agreements to which the Company is a party;

          (ix) (x) adopt, enter into or amend any bonus, profit sharing,
     compensation, 
<PAGE>

                                     -30-
 
     stock option, warrant, pension, retirement, deferred compensation,
     employment, consulting, indemnification, severance, termination or other
     employee benefit plan, agreement, trust fund or arrangement for the benefit
     or welfare of any officer, director or employee (y) except as reasonably
     called for pursuant to formulas contained in existing employee benefit
     plans or arrangements and except for salary increases in the ordinary
     course of business and consistent with past practices, agree to any
     increase in the compensation (including bonuses) payable or to become
     payable to any officer, director or employee or (z) change the performance
     objective or performance period under any employee benefit plans;

          (x) make any tax election that would have a material adverse effect on
     the Company and its Subsidiaries taken as a whole (and the Company shall,
     before filing or causing to be filed any material tax return of the Company
     or any of its Subsidiaries, consult with Purchaser and its advisors as to
     the positions and elections that may be taken or made with respect to such
     return and to the extent practical the Company shall defer settlement or
     compromise of any income tax liability of the Company or any of its
     Subsidiaries that would have a material adverse effect on the Company and
     its Subsidiaries taken as a whole until such time as Merger Sub's designees
     shall constitute a majority of the Board of Directors of the Company);

          (xi) waive any material rights or claims relating to the Company's
     business;

          (xii)  accelerate vesting or conversion or approve the acceleration or
     conversion of any shares of restricted stock, except as provided in Section
     7.4, or grant or approve the grant of any additional shares of restricted
     stock, phantom stock units, or stock options under any existing plan,
     except as provided in Section 7.4, or modify the term of any performance
     period or the performance objective to be attained for that performance
     period under any existing plan; or

          (xiii)  authorize any of, or commit or agree to take any of, the
     foregoing actions.

          SECTION 6.2. No Solicitation.  (a)__The Company shall, and shall
direct and use reasonable efforts to cause its officers, directors, employees,
representatives and agents to, immediately cease any discussions or negotiations
with any parties other than Purchaser and Merger Sub that may be ongoing with
respect to a Takeover Proposal (as hereinafter defined).  The Company shall not,
and shall not authorize or permit any of its officers, directors or employees or
any investment banker, financial advisor, attorney, accountant or other
representative retained by it to, directly or indirectly, (i) solicit, initiate
or encourage any inquiries or the making of any proposal that constitutes, or
may reasonably be expected to lead to, any Takeover Proposal or (ii) participate
in any discussions or negotiations regarding any Takeover Proposal; provided,
however, that if, at any time prior to the acceptance for payment of Shares
pursuant to the Offer, the Board of Directors of the Company determines in good
faith, after consultation with its financial advisers, that a Takeover Proposal
that has not been solicited,  
<PAGE>
 
                                     -31-

initiated or encouraged after the date hereof in violation of clause (i) above
(or Section 5.3 of the Tender and Voting Agreement) constitutes a Superior
Proposal (as defined in Section 9.1(d)(ii) hereof), the Company may (x) furnish
information with respect to the Company and its Subsidiaries to the third party
that has made such Takeover Proposal (and to any investment banker, financial
advisor, attorney, accountant or other representative retained by such party)
pursuant to a customary and reasonable confidentiality agreement and (y)
participate in negotiations regarding such Takeover Proposal. For purposes of
this Agreement, "Takeover Proposal" means any bona fide proposal made by a third
party to acquire, directly or indirectly, more than 30% of the voting power of
the Shares or of the assets of the Company; provided, however, that a change in
the terms of a proposal submitted prior to the date hereof shall be deemed a new
"Takeover Proposal."

          (b) In addition to the obligations of the Company set forth in Section
6.2(a) hereof, the Company shall immediately advise Purchaser orally and in
writing of any request for information or of any Takeover Proposal or any
inquiry regarding the making of a Takeover Proposal.

          (c) Nothing contained in this Section 6.2 shall prohibit the Company
from at any time taking and disclosing to its stockholders a position (including
the withdrawal or modification of any recommendation with respect to the Offer
and the Merger) contemplated by Rule 14e-2(a) promulgated under the Exchange Act
or from making any disclosure to the Company's stockholders if, in the good
faith judgment of the Board of Directors of the Company, after consultation with
outside counsel, failure so to disclose would create a risk of liability for
breach of its fiduciary duties to its stockholders under applicable law;
provided, however, that neither the Company nor its Board of Directors nor any
committee thereof shall, except as permitted by this Section 6.2(c) or as
contemplated by Section 9.1(d)(ii) hereof, withdraw or modify, or propose to
withdraw or modify, its position with respect to the Offer or the Merger or
approve or recommend, or propose to approve or recommend, a Takeover Proposal.

          SECTION 6.3. Use of Names and Logos.  Section 4.14 notwithstanding, it
is expressly agreed that Purchaser and Merger Sub are not purchasing or
acquiring any right, title or interest in the name of Parent or Company or any
trade names, trademarks, identifying logos, trade dress or service marks
employing or associated with the words "Archer Company" or "Champion Company" or
any respective part or variation thereof, including, without limitation, the
name "Archer", Archer prefix marks, the Spark Logo, or any confusingly similar
trade name, trademark, initials or logo (collectively, the "Archer Trademarks
and Logos").  Except to the extent permitted by licensing arrangements with
Purchaser and its affiliates, Purchaser and Merger Sub agree that neither they
nor any of their affiliates shall make any use of the Archer Trademarks and
Logos from and after the Closing Date, except that the Surviving Corporation may
continue to use materials containing Archer Trademarks and Logos for the period
after the 
<PAGE>
 
                                     -32-

Closing Date permitted under the immediately following sentence of this Section
6.3. Purchaser shall cause the Surviving Corporation, as promptly as practicable
but in no event later than 180 days following the Closing Date, to remove
"Archer" from the names of all companies, to remove, strike over or otherwise
obliterate all Archer Trademarks and Logos from all printed or consumable
materials, including, without limitation, any business cards, schedules,
stationery, promotional materials, manuals, forms and other similar materials,
if such materials are distributed or made available or proposed to be
distributed or made available to third parties. The Purchaser shall cause the
Surviving Corporation, with reasonable promptness, to prepare its own stock of
business cards, schedules, stationery, displays, signs, promotional materials,
manuals, forms and other materials to replace those materials included in its
properties and assets. The Purchaser shall cause the Surviving Corporation,
within two years following the Closing Date, to remove all Archer Trademarks and
Logos from all durable materials, including without limitation, any signage or
other fixed assets, vehicles, rail cars and other similar durable assets, and
Purchaser shall indemnify and defend Parent from all claims and causes of action
relating to or arising out of the carry-over use of the Archer Trademarks and
Logos herein after such two year period.

                                  ARTICLE VII
                             ADDITIONAL AGREEMENTS

          SECTION 7.1. Company Stockholder Approval.  (a)__If the Company
Stockholder Approval is required by the DGCL, the Company shall and Purchaser
shall cause the Company to, as soon as practicable following the acceptance for
payment of, and payment for, Shares by Merger Sub pursuant to the Offer, (i)
duly call, give notice of, convene and hold a meeting of the Company's
stockholders (the "Stockholders Meeting") for the purpose of obtaining the
Company Stockholder Approval and (ii) acting through its Board of Directors,
recommend to its stockholders that the Company Stockholder Approval be given.
Notwithstanding the foregoing, if Merger Sub (together with all Affiliates of
Merger Sub) shall acquire at least 90% of the outstanding Shares, the parties
shall take all necessary and appropriate action to cause the Merger to become
effective as soon as practicable after the expiration of the Offer without a
Stockholders Meeting in accordance with Section 253 of the DGCL.  Without
limiting the generality of the foregoing, the Company agrees that its
obligations pursuant to the first sentence of this Section 7.1(a) shall not be
affected by the commencement, public proposal, public disclosure or
communication to the Company of any Takeover Proposal.

          (b) If the Company Stockholder Approval is required by the DGCL, the
Company shall, and Purchaser shall cause the Company to, as soon as practicable
following the expiration of the Offer, prepare and file a preliminary
Information or Proxy Statement with the SEC and use its best efforts to respond
to any comments of the SEC or its staff and to cause the Information or 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 staff.  The
Company 
<PAGE>
 
                                     -33-

will notify Purchaser 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 the Information or Proxy Statement or for additional information
and will supply Purchaser 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 Information or Proxy Statement 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 the Information or Proxy
Statement, the Company will, and Purchaser shall cause the Company to, promptly
prepare and mail to its stockholders such an amendment or supplement. The
Company will not mail any Proxy Statement, or any amendment or supplement
thereto, to which Purchaser reasonably objects; provided, that Purchaser shall
identify its objections and fully cooperate with the Company to create a
mutually satisfactory Information or Proxy Statement.

          (c) Purchaser agrees to cause all Shares purchased pursuant to the
Offer to be voted in favor of, or shall consent to, the Company Stockholder
Approval.

          SECTION 7.2. Access to Information; Confidentiality.  (a)  The Company
shall afford to Purchaser, and to Purchaser's officers, employees, accountants,
counsel, financial advisers and other representatives, reasonable access,
without causing undue disruption to the business of the Company, during normal
business hours during the period prior to the purchase of Shares pursuant to the
Offer to its properties, books, contracts, personnel and records and, during
such period, the Company shall furnish promptly to Purchaser (i) a copy of each
report, schedule, registration statement and other document filed by it during
such period pursuant to the requirements of Federal or state securities laws and
(ii) all other information concerning its business, properties and personnel as
Purchaser may reasonably request, in each case only to the extent, in the
judgment of counsel to the Company, permitted by law, including antitrust law.
Except as otherwise agreed to by the Company, unless and until Purchaser and
Merger Sub shall have purchased at least a majority of the outstanding Shares
pursuant to the Offer, Purchaser shall hold, and shall cause its officers,
employees, accountants, counsel, financial advisers and other representatives
and affiliates to hold, any and all information received from the Company,
directly or indirectly, in confidence, according to the terms of the
confidentiality agreement dated as of April 22, 1998, between the Company,
Purchaser and Parent (the "Confidentiality Agreement").

          SECTION 7.3. Reasonable Efforts; Notification.  (a)__Upon the terms
and subject to the conditions hereof, each of the parties hereto shall use its
commercially reasonable efforts to take, or cause to be taken, all appropriate
action, and to do or cause to be done, all things necessary, proper or advisable
under applicable laws and regulations to consummate and make effective the
transactions contemplated by this Agreement as soon as practicable, including
but not limited to (i) cooperation in the preparation and filing of the Offer
Documents, the Schedule 14D-9, the Information Statement, the Proxy Statement,
any required filings under the 
<PAGE>
 
                                     -34-

HSR Act or other foreign filings and any amendments or supplements to any
thereof and (ii) using its commercially reasonable efforts to promptly make all
required regulatory filings and applications including, without limitation,
responding promptly to requests for further information and to obtain all
licenses, permits, consents, approvals, authorizations, qualifications and
orders of Governmental Entities as are necessary for the consummation of the
transactions contemplated by this Agreement and to fulfill the conditions to the
Offer and the Merger. In case at any time after the Effective Time any further
action is necessary or desirable to carry out the purposes of this Agreement,
the proper officers and directors of each party to this Agreement shall use
their commercially reasonable efforts to take all such necessary action.

          (b) The Company and Purchaser each shall keep the other apprised of
the status of matters relating to completion of the transactions contemplated
hereby, including promptly furnishing the other with copies of notices or other
communications received by Purchaser or the Company, as the case may be, or any
of their subsidiaries, from any Governmental Entity with respect to the Offer,
the Merger or any of the other transactions contemplated by this Agreement.  The
parties hereto will consult and cooperate with one another, and consider in good
faith the views of one another in connection with, and shall provide each other
the opportunity to review and comment upon, any analyses, appearances,
presentations, memoranda, briefs, arguments, opinions and proposals made or
submitted by or on behalf of any party hereto in connection with proceedings
under or relating to the HSR Act or any other antitrust law.

          (c) Without limiting the generality of the undertakings pursuant to
this Section 7.3:  (i) Purchaser agrees that, if necessary to prevent any
Governmental Entity from taking steps to obtain, or from issuing, any order,
injunction, decree, judgment or ruling or the taking of any other action that
would (x) restrain, enjoin or otherwise prohibit the Offer, the Merger or any of
the other transactions contemplated by this Agreement or (y) cause any Offer
Condition not to be satisfied, Purchaser shall (A) offer to accept an order to
divest (and to enter into a consent decree or other agreement giving effect
thereto) such of the Company's or Purchaser's assets and business, and agree to
hold separate such assets and business pending such divestiture, and (B) enter
into any supply, license, tolling, joint venture or other agreement or take any
other action, as may be necessary to forestall such order, decree, ruling or
action; provided, however, that notwithstanding the foregoing provisions of this
clause (i), Purchaser shall not be required to take any such action that would
have a material adverse effect on the Company and its Subsidiaries taken as a
whole, to waive any material rights, or to take any action that would result in
any of the consequences referred to in paragraph (a) of Exhibit A and (ii)
without limitation of clause (i) of this Section 7.3(c), the Company and
Purchaser each agree to contest and resist any action seeking to have imposed
any order, decree, judgment, injunction, ruling or other order (whether
temporary, preliminary or permanent) (an "Order") that (x) would delay,
restrain, enjoin or otherwise prohibit consummation of the Offer, the Merger or
any of the 
<PAGE>
 
                                     -35-

other transactions contemplated by this Agreement or (y) cause any Offer
Condition not to be satisfied and, in the event that any such temporary or
preliminary Order is entered in any proceeding, to take the steps contemplated
by clause (i) of this Section 7.3(c) and to use its commercially reasonable
efforts to take promptly any and all other steps (including, the appeal thereof
and the posting of a bond) necessary to vacate, modify or suspend such Order so
as to permit such consummation as promptly as practicable after the date hereof.

          SECTION 7.4. Stock Incentive Plans.  (a)__Upon the consummation of the
Offer, as and to the extent provided in the Company's Change of Control Plan
(i) each outstanding option to purchase Shares (a "Company Stock Option")
heretofore granted under any stock option, stock appreciation rights or stock
purchase plan, program or arrangement of the Company (collectively, the "Stock
Incentive Plans") outstanding immediately prior to the consummation of the
Offer, whether or not then exercisable, shall be canceled by the Company in
exchange for an amount in cash, payable at the time of such cancellation, equal
to the product of (x) the number of Shares subject to such Company Stock Option
immediately prior to the consummation of the Offer and (y) the excess of the
price per Share to be paid in the Offer over the per Share exercise price of
such Company Stock Option (the "Net Amount"); (ii) each phantom stock unit
granted under the Company's Value Incentive Plan outstanding immediately prior
to the consummation of the Offer shall, whether or not exercisable, be canceled
in exchange for an amount in cash, payable at the time of such cancellation,
equal to (x) the excess of (1) the price per Share paid in the Offer over (2)
the award price assigned to the phantom stock unit, multiplied by (y) the number
of Shares subject to such unit (the "SAR Amount"); (iii) each dividend share
credit ("DSCs") accrued, credited or issued immediately prior to the
consummation of the Offer in connection with a Company Stock Option or phantom
stock unit, and each DSC that would have been accrued, credited or issued (as
determined in accordance with the Company's Change of Control Plan) through the
remainder of the term of each such Company Stock Option or phantom stock unit,
shall, whether or not vested, be canceled in exchange for an amount in cash,
payable at the time of such cancellation, equal to the price per Share paid in
the Offer (the "DSC Amount"); (iv) each share of contingent restricted stock
issued under the Company's 1998 Long Term Incentive Plan (the "1998 LTIP") that
is eligible for conversion upon achievement of the current Return on Capital
Managed target (the "RCM") performance level established under the 1998 LTIP
shall, immediately prior to the consummation of the Offer, be converted to
performance-based restricted stock on a pro-rated basis based on a calculation
of the percentage of the current RCM performance objective achieved as of the
consummation of the Offer (but not to exceed 25% of the outstanding shares of
contingent restricted stock issued under the 1998 LTIP); (v) the performance
supplement related to the contingent restricted stock referred to in clause;
(iv) above shall be calculated immediately prior to the consummation of the
Offer using the price per Share to be paid in the Offer, and the resulting
number of shares of performance-based restricted stock shall be issued to the
<PAGE>
 
                                     -36-

Company's employees in accordance with the 1998 LTIP; and (vi) each share of
performance-based restricted stock outstanding immediately prior to the
consummation of the Offer (including amounts issued under clauses (iv) and (v)
of this Section 7.4(a)) shall, whether or not vested, be canceled in exchange
for an amount in cash, payable at the time of such cancellation, equal to the
price per Share paid in the Offer (the "Restricted Stock Amount").

          (b) Subject to Section 7.4(a) hereof, all Stock Incentive Plans shall
terminate as of the Effective Time.  Notwithstanding the foregoing, the
Surviving Corporation shall continue to be obligated to pay the Net Amount, the
SAR Amount, the DSC Amount and the Restricted Stock Amount.

          (c) All calculations required to be made pursuant to this Section 7.4
shall be made in accordance with Article IV of the Company's Change of Control
Plan and the terms of the relevant Stock Incentive Plan.

          (d) The Company represents that Parent has taken all such actions as
are necessary so that options to acquire Parent shares and DSCs with respect to
Parent shares held by or credited to employees of the Company and its
subsidiaries are not forfeited upon consummation of the Offer and remain
outstanding for the duration of their terms.

          SECTION 7.5. Indemnification, Exculpation and Insurance.
(a)__Purchaser agrees that all rights to indemnification and exculpation
(including the advancement of expenses) from liabilities for acts or omissions
occurring at or prior to the Effective Time (including with respect to the
transactions contemplated by this Agreement) existing now or at the Effective
Time in favor of the current or former directors or officers of the Company as
provided in its Certificate of Incorporation, its By-laws (each as in effect on
the date hereof) and indemnification agreements shall be assumed by the
Surviving Corporation in the Merger, without further action, as of the Effective
Time and shall survive the Merger and shall continue in full force and effect
without amendment, modification or repeal in accordance with their terms for a
period of not less than six years after the Effective Time; provided, however,
that if any claims are asserted or made within such six-year period, all rights
to indemnification (and to advancement of expenses) hereunder in respect of any
such claims shall continue, without diminution, until disposition of any and all
such claims.

          (b) For six years after the Effective Time, Purchaser agrees that it
shall and shall cause the Surviving Corporation to indemnify and hold harmless
each present and former director and officer of the Company, determined as of
the Effective Time (the "Indemnified Parties"), against any costs or expenses
(including reasonable attorneys' fees), judgments, fines, losses, claims,
damages or liabilities (collectively, "Costs") (but only to the extent such
Costs are not otherwise covered by insurance and paid) incurred in connection
with any claim, action, suit, proceeding or investigation, whether civil,
criminal, administrative or investigative, arising out of or pertaining to
matters existing or occurring at or prior to the Effective Time, including in
connection with this Agreement and the transactions contemplated hereby, whether
asserted or 
<PAGE>
 
                                     -37-

claimed prior to, at or after the Effective Time, to the fullest
extent permitted under applicable law (and Purchaser shall, or shall cause the
Surviving Corporation to, also advance expenses as incurred to the fullest
extent permitted under applicable law); provided, however, that, with respect to
any Indemnified Person that is an officer or employee of Parent as of the date
hereof, such Indemnified Person shall first have pursued all available rights to
indemnification (and advancement of expenses) from Parent.  Parent shall
indemnify and hold harmless any such Indemnified Person that is at the date
hereof an officer or employee of Parent against any such Costs (not covered by
insurance and paid) to the fullest extent permitted under applicable law (and
Parent shall also advance expenses as incurred to the fullest extent permitted
under applicable law).

          (c) In the event that Purchaser, the Surviving Corporation or any of
their successors or assigns (i) consolidates with or merges into any other
person and is not the continuing or surviving corporation or entity of such
consolidation or merger or (ii) transfers or conveys all or substantially all of
its properties and assets to any person, then, and in each such case, proper
provision will be made so that the successors and assigns of Purchaser or the
Surviving Corporation, as the case may be, shall assume the obligations set
forth in Sections 7.5(a) and (b).  In the event the Surviving Corporation
transfers any material portion of its assets, in a single transaction or in a
series of transactions, Purchaser will either guarantee the indemnification
obligations referred to in Sections 7.5(a) and (b) hereof or take such other
action to insure that the ability of the Surviving Corporation, legal and
financial, to satisfy such indemnification obligations will not be diminished in
any material respect.

          (d) For a period of six years after the Effective Time, Parent shall
cause to be maintained in effect policies of directors' and officers' liability
insurance substantially in the amounts currently maintained by Parent and
covering the officers, directors and employees of the Company currently covered
by Parent's directors' and officers' liability insurance with similar terms and
conditions with respect to claims arising from or related to facts or events
which occurred at or before the Effective Time; provided, however, that Parent
shall not be obligated to make annual premium payments for such insurance to the
extent such premiums exceed 200% of the annual premiums paid as of the date
hereof by Parent for such insurance (such 200% amount, the "Maximum Premium").
If such insurance coverage cannot be obtained at all, or can only be obtained at
an annual premium in excess of the Maximum Premium, Parent shall maintain the
most advantageous policies of directors' and officers' insurance obtainable for
an annual premium equal to the Maximum Premium; provided further, if such
insurance coverage cannot be obtained at all, Parent shall purchase extended
reporting periods with respect to such insurance for an amount which, together
with all other insurance purchased pursuant to this Section 7.5(d), does not
exceed the Maximum Premium.  It is understood that Parent will not take any
action that would have the effect of limiting the aggregate amount of insurance
coverage required to be maintained for the individuals referred to in this
Section 7.5(d).
<PAGE>
 
                                     -38-

          (e) The provisions of this Section 7.5 (x) are intended to be for the
benefit of, and shall be enforceable by, each indemnified party, his or her
heirs and his or her representatives and (y) are in addition to, and not in
substitution for, any other rights to indemnification or contribution that any
such person may have by contract or otherwise.

          SECTION 7.6. Fees and Expenses.  All fees and expenses incurred in
connection with the Offer, 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 Offer or the Merger is consummated.

          SECTION 7.7. Public Announcements.  Purchaser and Merger Sub, on the
one hand, and the Company, on the other hand, shall consult with each other
before issuing, and provide each other the opportunity to review and comment
upon, any press release or other public statements with respect to the
transactions contemplated by this Agreement, including the Offer and the Merger,
and shall not issue any such press release or make any such public statement
prior to such consultation, except as may be required by applicable law, court
process or by obligations pursuant to any listing agreement with any national
securities exchange or national securities quotation system.  The parties agree
that the initial press release to be issued with respect to the transactions
contemplated by this Agreement shall be in the form heretofore agreed to by the
parties.

          SECTION 7.8. Employee Benefits Matters.  (a)__At and after the
consummation of the Offer, Purchaser shall cause the Company and its
subsidiaries to promptly pay or provide when due all compensation and benefits
provided for pursuant to the terms of any compensation arrangements, employment
agreements and employee or director benefit plans (including, without
limitation, deferred compensation and change of control plans), programs and
policies in existence as of the consummation of the Offer for any employee
(and/or former employee) and director (and/or former director) of the Company
and its subsidiaries; provided, however, that this Section 7.8(a) shall not
preclude Purchaser from amending or terminating any such plans, arrangements,
programs or policies after the consummation of the Offer.  Purchaser and the
Company agree that the Company and its subsidiaries shall pay promptly or
provide when due all compensation and benefits required to be paid pursuant to
the terms of any individual agreement with any employee, former employee,
director or former director in effect as of the date hereof.

          (b) Purchaser shall cause the Company, for the period commencing upon
the consummation of the Offer and ending on the end of the calendar year
following the year in which the consummation of the Offer occurs (the
"Continuation Period"), to provide employee benefits under plans, programs and
arrangements which, in the aggregate for all current employees of the Company
and its Subsidiaries as a group (other than employees covered by a collective
bargaining agreement), will provide benefits to such employees which are not
materially less favorable than those provided pursuant to the plans, programs
and arrangements 
<PAGE>
 
                                     -39-

of the Company and its subsidiaries in effect on the date hereof and employees
covered by collective bargaining agreements shall be provided with such benefits
as shall be required under the terms of any applicable collective bargaining
agreement; provided, however, that, without limiting the generality of the
foregoing, the Purchaser shall not be required to provide compensation which is
based upon the equity of the Company or any of its subsidiaries; and provided,
however, that, without limiting the generality of the foregoing, nothing herein
shall prevent the amendment or termination of any specific plan, program or
arrangement, require that the Surviving Corporation provide or permit investment
in the securities of Purchaser, the Company or the Surviving Corporation or
interfere with the Surviving Corporation's right or obligation to make such
changes as are necessary to conform with applicable law. During the Continuation
Period, the Purchaser shall provide, or cause the Surviving Corporation to
provide post-retirement health, dental, life insurance and other welfare
benefits that are not materially less favorable than those that are provided by
the Company immediately prior to the consummation of the Offer to those
employees or directors or former employees or directors of the Company and any
of its subsidiaries who at such time (x) were receiving any such benefits, (y)
would have been eligible to receive any of such benefits upon his or her
termination at such time or (z) would have become eligible within one (1) year
of such time to receive any of such benefits upon his or her termination with
such one-year period.] Employees of the Company and its subsidiaries shall be
given credit for all service with the Parent and its affiliates and with the
Company and its subsidiaries, under each employee benefit plan, program, or
arrangement of the Purchaser or its affiliates in which such employees are
eligible to participate for purposes of eligibility, vesting and benefit
accrual; provided, however, that in no event shall such employees be entitled to
any credit to the extent that it would result in any duplication of benefits
with respect to the same period of service under any plans of the Parent and its
affiliates, the Company and the Purchaser.

          (c) If employees of the Company and its subsidiaries become eligible
to participate in a medical, dental, disability, life insurance or other welfare
plan of Purchaser or its subsidiaries, Purchaser shall cause such plan to (i)
waive any preexisting condition limitations for conditions covered under the
applicable plan of the Parent or the Company and its or their subsidiaries and
(ii) give credit for any deductible and out of pocket expenses incurred by the
employees and their beneficiaries under such plans prior to such participation.

          (d) Nothing in this Section 7.8 shall require the continued employment
of any person or, subject to paragraph (b) and (c) hereof, prevent the Company
and/or the Surviving Corporation and their subsidiaries from taking any action
or refraining from taking any action which the Company and its subsidiaries
prior to the consummation of the offer, could have taken or refrained from
taking.

          (e) Promptly following the execution of this Agreement, the Company
and Parent will enter into an agreement providing that, effective upon the
purchase of Shares 
<PAGE>
 
                                     -40-

pursuant to the Offer, all administrative service agreements and arrangements
between Parent and the Company relating to the Company's employee benefit plans
and payroll services shall continue for a period no less than the Continuation
Period; provided, however, that Parent shall have the right to (i) terminate
such agreement if there are any change or changes in such benefit plans or
payroll services that result in any additional costs or burdens to Parent in
performing its obligations under such agreement and (ii) to remove AIMCO as
designated fiduciary with respect to employee benefit plans within 90 days after
the consummation of the Offer.

          SECTION 7.9. Termination of Other Agreements.  The Company represents
that the Company and Parent will terminate the Stock Repurchase Agreement, dated
as of June 2, 1998 (the "Stock Repurchase Agreement"), the Stockholder
Agreement, dated as of June 2, 1998, the Registration Rights Agreement dated as
of June 2, 1998 and the Stockholder Agreement dated as of June 30, 1987, in each
case between the Company and Parent, effective upon the consummation of the
purchase of Shares by Purchaser under the Offer.

          SECTION 7.10.  Insurance.  In connection with the arranging of
appropriate insurance coverage for the Company and its subsidiaries from and
after the purchase of Shares pursuant to the Offer, the Company and Parent shall
provide Purchaser on an expedited basis all reasonable assistance, including
access to relevant personnel and copies of relevant information.

                                  ARTICLE VIII
                                   CONDITIONS

          SECTION 8.1. Conditions to Each Party's Obligation to Effect the
Merger.  The respective obligation of each party to effect the Merger shall be
subject to the satisfaction prior to the Closing Date of the following
conditions:

          (a) Company Stockholder Approval.  If required by the DGCL, the
     Company Stockholder Approval shall have been obtained; provided, however,
     that neither Purchaser nor Merger Sub shall be entitled to assert the
     failure of this condition if Purchaser breaches its agreement set forth in
     Section 7.1(c) hereof.

          (b) No Injunctions, Etc.  No statute, rule, regulation, executive
     order, decree, temporary restraining order, preliminary or permanent
     injunction or other order issued by any court of competent jurisdiction or
     other Governmental Entity or other legal restraint or prohibition
     preventing the consummation of the Merger shall be in effect.

          (c) Purchase of Shares.  Merger Sub shall have accepted for payment
     and paid for Shares pursuant to the Offer; provided, however, that neither
     Purchaser nor Merger Sub shall be entitled to assert the failure of this
     condition if Merger Sub breaches any of its obligations in Section 1.1(a)
     hereof or fails to purchase Shares pursuant to the Offer in breach of its
     obligations under this Agreement.

                                   ARTICLE IX
                           TERMINATION AND AMENDMENT

          SECTION 9.1. Termination.  This Agreement may be terminated at any
time 
<PAGE>
 
                                     -41-

prior to the Effective Time, whether before or after the Company Stockholder
Approval (if required by the DGCL):

          (a) by mutual written consent of Purchaser and the Company;

          (b) by either Purchaser or the Company if

               (i) any Governmental Entity shall have issued an order, decree or
     ruling or taken any other action permanently enjoining, restraining or
     otherwise prohibiting the acceptance for payment of, or payment for, Shares
     pursuant to the Offer or the Merger and such order, decree or ruling or
     other action shall have become final and nonappealable; or
               (ii) the Merger shall not have been consummated by June 30, 1999.

          (c) by the Purchaser if as the result of  a failure of an Offer
Condition to be satisfied, Merger Sub shall not have accepted for payment any
Shares pursuant to the Offer on or prior to the Outside Date; provided, however,
that the right to terminate this Agreement pursuant to this Section 9.1(c) shall
not be available to Purchaser if (x) Merger Sub shall have breached its
obligations under the next to the last sentence of Section 1.1(a) hereof or (y)
such failure to satisfy an Offer Condition is caused by or results from the
failure of Purchaser or Merger Sub to perform in any material respect any of its
covenants or agreements contained in this Agreement or the failure of any
representation or warranty of  Purchaser or Merger Sub contained herein to be
true and correct in any material respect. As used herein, the "Outside Date"
shall mean the later of (A) the 30th day after the initial expiration date of
the Offer or (B) the date that all conditions to the Offer set forth in the
Antitrust Condition and paragraph (a) of Exhibit A, the satisfaction of which
involve compliance with or otherwise relate to any antitrust or competition laws
or regulations (including any enforcement thereof), have been satisfied for a
period of two business days, but in any event no later than the 60th day after
the initial expiration date of the Offer; or

          (d)  by the Company if:

               (i) Merger Sub shall not have accepted for payment any Shares
     pursuant to the Offer on or prior to the Outside Date,  provided, however,
     that the right to terminate this Agreement pursuant to this Section
     9.1(d)(i) shall not be available to the Company if  the failure to accept
     Shares for payment is caused by or results from the failure of the Company
     to satisfy any condition set forth in paragraphs (c) or (d) of Exhibit A;
     or

               (ii) prior to the acceptance by Merger Sub of Shares for payment
     pursuant to the Offer, the Board of Directors of the Company determines
     that a Takeover Proposal constitutes a Superior Proposal (as defined
     below).  For purposes of this Agreement, a "Superior Proposal" means any
     Takeover Proposal having terms which the Board of Directors of the Company
     determines in its good faith judgment (based, with respect to the
     consideration payable, on the opinion of a financial advisor of nationally
<PAGE>
 
                                     -42-

     recognized reputation)  (x) to be more favorable to the Company's
     stockholders than the Offer and the Merger and (y) to be reasonably capable
     of being completed (and for which financing has been committed on customary
     items); provided, however, that at least two business days prior to such
     termination the Company shall have given Purchaser written notice advising
     Purchaser that the Board of Directors of the Company has received a
     Takeover Proposal that it has determined to be a Superior Proposal,
     specifying the material terms and conditions of such Superior Proposal and
     identifying the person making such Superior Proposal; and provided,
     further, however, that (i) prior to such termination, the Board of
     Directors has reaffirmed its determination that such Takeover Proposal,
     taking into account any amendment by Purchaser of the terms of the Offer
     and Merger or any offer by Purchaser to amend the terms of this Agreement,
     the Offer or the Merger, together with any subsequent amendments or
     modifications of such Takeover Proposal, is a Superior Proposal and (ii) no
     termination pursuant to this Section 9.1(d)(ii) shall be effective unless
     concurrently with such termination a termination fee equal to $140,000,000
     is paid in cash by the Company to Purchaser.

          SECTION 9.2. Effect of Termination.  In the event of a termination of
this Agreement by either the Company or Purchaser as provided in Section 9.1,
this Agreement shall forthwith become void and there shall be no liability or
obligation on the part of Purchaser, Merger Sub or the Company or their
respective officers or directors, except with respect to the last sentence of
Section 1.2(c), Section 5.7, the last sentence of Section 7.2, Section 9.1, this
Section 9.2 and Article X; provided, however, that nothing herein shall relieve
any party for liability for any willful and material breach hereof.

          SECTION 9.3. Amendment.  This Agreement may be amended by the parties
hereto, by action taken or authorized by their respective Boards of Directors,
at any time before or after obtaining the Company Stockholder Approval (if
required by the DGCL), but, after any such approval, no amendment shall be made
which by law requires further approval by such stockholders without obtaining
such further approval.  This Agreement may not be amended except by an
instrument in writing signed on behalf of each of the parties hereto.

          SECTION 9.4. Extension; Waiver.  At any time prior to the Effective
Time, the parties hereto, by action taken or authorized by their respective
Boards of Directors, may, to the extent legally allowed, (i) extend the time for
the performance of any of the obligations or other acts of the other parties
hereto, (ii) waive any inaccuracies in the representations and warranties
contained herein or in any document delivered pursuant hereto or (iii) subject
to Section 9.3, waive compliance with any of the agreements or conditions
contained herein.  Any agreement on the part of a party hereto to any such
extension or waiver shall be valid only if set forth in a written instrument
signed on behalf of such party.  The failure of any party to this Agreement to
assert any of its rights under this Agreement or otherwise shall not constitute
a waiver of those rights.
<PAGE>
 
                                     -43-


          SECTION 9.5. Procedure for Termination, Amendment, Extension or
Waiver.  A termination of this Agreement pursuant to Section 9.1, an amendment
of this Agreement pursuant to Section 9.3 or an extension or waiver pursuant to
Section 9.4 shall, in order to be effective, require in the case of Purchaser,
Merger Sub or the Company, action by its Board of Directors or the duly
authorized designee of its Board of Directors; provided, however, that in the
event that Merger Sub's designees are appointed or elected to the Board of
Directors of the Company as provided in Section 1.3, after the acceptance for
payment and payment of Shares pursuant to the Offer and prior to the Effective
Time, the affirmative vote of a majority of the Independent Directors of the
Company that were not designated by Purchaser or Merger Sub shall be required by
the Company to take any action relating to this Agreement, the Offer, the Merger
or any other transactions contemplated hereby, including (i) amending or
terminating this Agreement, (ii) exercising or waiving any of the Company's,
shareholders' or employees' rights or remedies under this Agreement,
(iii) extending the time for performance of Purchaser's and Merger Sub's
respective obligations under this Agreement, (iv) approving any other action by
its Board of Directors with respect to this Agreement, or (v) amending or
otherwise modifying the Company's Certificate of Incorporation or By-laws.

                                   ARTICLE X
                                 MISCELLANEOUS

          SECTION 10.1.  Nonsurvival of Representations, Warranties and
Agreements.  None of the representations, warranties or covenants (subject to
the succeeding sentence) in this Agreement or in any instrument delivered
pursuant to this Agreement shall survive the Effective Time or, in the case of
the Company, shall survive the acceptance for payment of, and payment for,
Shares by Merger Sub pursuant to the Offer.  This Section 10.1 shall not limit
any covenant or agreement of the parties (or Parent) which by its terms
contemplates performance after the Effective Time.

          SECTION 10.2.  Notices.  All notices and other communications
hereunder shall be in writing and shall be deemed given if delivered personally,
telecopied (which is confirmed), sent by overnight courier (providing proof of
delivery) 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 Purchaser or Merger Sub, to
              Lyondell Petrochemical Company
              1221 McKinney Street
              Houston, Texas 77010
              Attention:  Kerry A. Galvin, Esq., Chief Corporate Counsel
              Telecopy No.:  (713) 309-4718
              with copies to:
              Baker & Botts, L.L.P.
<PAGE>
 
                                     -44-

              One Shell Plaza
              910 Louisiana Street
              Houston, Texas 77002
              Attention:  Stephen A. Massad, Esq.
              Telecopy No.:  (713) 229-1522
              and

          (b)  if to the Company, to

              ARCO Chemical Company
              3801 West Chester Pike
              Newtown Square, Pennsylvania  19073
              Attention:  Robert Millstone, Esq.
              Telecopy No.:  (610) 359-3344
              with copies to:
              Atlantic Richfield Company
              515 South Flower Street
              Los Angeles, California  900071
              Attention:  John Lucas, Esq.
              Telecopy No.:  (213) 486-1544

          SECTION 10.3.  Interpretation.  When a reference is made in this
Agreement to an Article or a Section, such reference shall be to an Article or a
Section of this Agreement unless otherwise indicated.  The table of contents and
headings contained in this Agreement are for reference purposes only and shall
not affect in any way the meaning or interpretation of this Agreement.  Whenever
the words "Aincludes" or "including" are used in this Agreement, they
shall be deemed to be followed by the words "without limitation".  As used in
this Agreement, (x) "material adverse change" or "material adverse effect"
means, when used in connection with the Company and its Subsidiaries, any change
or effect that, individually or in the aggregate, with any such other changes or
effects (except that when used with respect to any representation or warranty
(other than Section 4.8), covenant or agreement, such other changes or effects
shall be limited to those resulting from a breach of such representation,
warranty, covenant or agreement), is materially adverse to the business, assets,
financial condition or results of operations of the Company and its Subsidiaries
taken as a whole, except for changes or effects relating to the economy in
general or resulting from actions expressly contemplated by this Agreement
(including Section 7.3), (y) "person" means an individual, corporation,
partnership, association, trust, unincorporated organization, other entity or
group (as defined in Regulation 13D-G) of the Exchange Act) and (z) "knowledge
of the Company", "the Company's knowledge" or variants thereof shall mean the
actual knowledge as of the date of this Agreement, of the President and Chief
Executive Officer; Senior Vice President, Manufacturing, Research, Engineering,
and Environmental, Health and Safety; Senior Vice President, Chief Financial
<PAGE>
 
                                     -45-

Officer; Vice President and Controller; Vice President, General Counsel and
Secretary; Vice President, Human Resources; and General Tax Officer in each case
without specific investigation.  Matters reflected in the Disclosure Letter are
not necessarily limited to matters required or contemplated by this Agreement to
be reflected therein.  Such additional matters are set forth for informational
purposes and do not necessarily include other matters of a similar nature.  In
no event shall the listing of such matters in the Disclosure Letter be deemed or
interpreted to broaden or otherwise amplify the Company's representations,
warranties, covenants or agreements contained in this Agreement.

          SECTION 10.4.  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 parties, it being understood that
all parties need not sign the same counterpart.

          SECTION 10.5.  Entire Agreement; Third Party Beneficiaries.  This
Agreement and the Confidentiality Agreement (including the documents and the
instruments referred to herein) constitute the entire agreement and supersede
all prior agreements and understandings, both written and oral, among the
parties with respect to the subject matter hereof.  The representations and
warranties made by the Company in this Agreement and in the Disclosure Letter
are in lieu of and are exclusive of all other representations and warranties,
including any implied warranties.  The Company and Parent hereby disclaim any
such other or implied representations or warranties, notwithstanding the
delivery or disclosure to Purchaser, Merger Sub or their officers, directors,
employees, agents or representatives of any documentation or other information
(including, without limitation, any financial projections or other supplemental
data).  Except as set forth below with respect to the provisions of Section 6.3,
Section 7.1, and Articles II and III hereof, this Agreement is not intended to
confer upon any person other than the parties hereto any rights or remedies
hereunder.  The provisions of Section 6.3 are intended to be for the benefit of,
and shall be enforceable against Purchaser and Merger Sub by, Archer.  Each
person who is an Independent Director as of the date hereof or immediately prior
to the Closing shall have the right (but shall have no obligation) to enforce
(against Purchaser and the Surviving Corporation, as applicable) the provisions
of Articles II and III and Section 7.1 on behalf of the Company or any person
who is a stockholder of the Company immediately prior to the Closing.

          SECTION 10.6.  Governing Law.  This Agreement shall be governed and
construed in accordance with the laws of the State of Delaware, without regard
to principles of conflicts of law.

          SECTION 10.7.  Assignment.  Neither this Agreement nor any of the
rights, interests or obligations hereunder shall be assigned by any of the
parties hereto (whether by operation of law or otherwise) without the prior
written consent of the other parties.  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.
<PAGE>
 
                                     -46-

          SECTION 10.8.  Enforcement.  Each of the parties hereto (i) consents
to submit such party to the non-exclusive jurisdiction of any Federal court
located in the State of Delaware or any Delaware state court in the event any
dispute arises out of this Agreement or any of the transactions contemplated
hereby, (ii) agrees that such party will not attempt to deny or defeat such
personal jurisdiction by motion or other request for leave from any such court,
(iii) agrees that such party will not bring any action relating to this
Agreement or any of the transactions contemplated hereby in any court other than
a Federal court sitting in the state of Delaware or a Delaware state court and
(iv) waives any right to trial by jury with respect to any claim or proceeding
related to or arising out of this Agreement or any of the transactions
contemplated hereby.
<PAGE>
 
          IN WITNESS WHEREOF, Purchaser, Merger Sub and the Company have caused
this Agreement to be signed by their respective officers thereunto duly
authorized as of the date first written above.

                              LYONDELL PETROCHEMICAL COMPANY

                              By       /s/ Dan F. Smith
                                -----------------------------
                                Name:  Dan F. Smith
                                Title: President and Chief Executive Officer

                              LYONDELL ACQUISITION CORPORATION

                              By       /s/ Dan F. Smith
                                ------------------------------
                                Name:  Dan F. Smith
                                Title: President and Chief Executive Officer

                              ARCO CHEMICAL COMPANY

                              By   /s/ Marvin O. Schlanger
                                ------------------------------
                                Name:  Marvin O. Schlanger
                                Title: Chief Executive Officer
<PAGE>
 
                                                                       EXHIBIT A

                            CONDITIONS OF THE OFFER

          The defined terms used in this Exhibit A for the meanings set forth in
the attached Agreement, except that the term "Merger Agreement" shall be deemed
to refer to the attached Agreement.

          Notwithstanding any other term of the Offer but subject to the terms
and conditions of the Merger Agreement, Merger Sub shall not be required to
accept for payment or, subject to any applicable rules and regulations of the
SEC, including Rule 14e-l(c) under the Exchange Act (relating to Merger Sub's
obligation to pay for or return tendered Shares after the termination or
withdrawal of the Offer), to pay for any Shares tendered pursuant to the Offer
if (i) there shall not have been validly tendered and not withdrawn as of  the
expiration of the Offer such number of Shares that, together with any Shares
owned by Purchaser, Merger Sub and all of their affiliates, would constitute a
majority of the fully diluted Shares as of the expiration of the Offer
(determined on a fully diluted basis for all outstanding stock options and any
other rights to acquire Shares that are or would be vested prior to the
expiration of the Offer) (the "Minimum Condition") or (ii) any waiting period
under the HSR Act applicable to the purchase of Shares pursuant to the Offer
shall not have expired or been terminated (the "Antitrust Condition").
Furthermore, Merger Sub shall not be required to accept for payment or, subject
as aforesaid, to pay for any Shares not theretofore accepted for payment or paid
for, and may terminate the Offer if after the date of the Merger Agreement and
before acceptance of such Shares for payment or the payment therefor pursuant to
the Offer, any of the following conditions has occurred and continues to exist
as of a scheduled expiration date of the Offer (as extended, if required,
pursuant to the next to the last sentence of Section 1.1(a) of the Merger
Agreement) (other than as a result of a breach by Purchaser or Merger Sub of any
of their obligations under the Merger Agreement (including, without limitation,
Section 7.3 thereof)):

          (a) there shall have been entered and then in effect any order,
     preliminary or permanent injunction, decree, judgment or ruling in any
     action or proceeding before any court or governmental, administrative or
     regulatory authority or agency, or any statute, rule or regulation enacted,
     entered, enforced, promulgated, amended or issued that is applicable to
     Purchaser, Merger Sub, the Company or any subsidiary or affiliate of Merger
     Sub or the Company or the Offer or the Merger, by any legislative body,
     court, government or governmental, administrative or regulatory authority
     or agency that: (i) makes illegal or otherwise restrains or prohibits the
     consummation of the Offer in accordance with the terms of the Merger
     Agreement, the acceptance for payment of, or payment for, the Shares by
     Merger Sub or any of its affiliates, or the consummation of the Merger;
     (ii) prohibits the ownership or operation by the Company or any of its
     subsidiaries, or Purchaser or any of its subsidiaries, of all or any
     material portion of the business or assets of the Company and its
     subsidiaries, taken as a whole, or Purchaser or its subsidiaries, taken as
     a whole, or materially limits the ownership or operation by the 
<PAGE>
 
     Company or any of its subsidiaries, or Purchaser or any of its
     subsidiaries, of all or any material portion of the business or assets of
     the Company and its subsidiaries, taken as a whole, or Purchaser and its
     subsidiaries, taken as a whole, or compels Purchaser or any of its
     subsidiaries to dispose of or hold separate all or any material portion of
     the businesses or assets of the Company and its subsidiaries, taken as a
     whole, or Purchaser and its subsidiaries, taken as a whole, in any such
     case as a result of the transactions contemplated by the Offer or the
     Merger Agreement; (iii) imposes substantial limitations on the ability of
     Purchaser, Merger Sub or any of Purchaser's affiliates effectively to
     acquire or hold or to exercise full rights of ownership of Shares; or (iv)
     requires divestiture by Purchaser or Merger Sub or any of their affiliates
     of any material portion of the Shares; provided, however, that this
     paragraph (a) shall not apply to or include any consent decree or agreement
     entered into by Purchaser, or any other action taken by Purchaser, in
     connection with satisfying its obligations under Section 7.3 of the Merger
     Agreement;

          (b) there shall have occurred any material adverse change (as defined
     in the Merger Agreement) in the Company and its Subsidiaries taken as a
     whole;

          (c) any of the representations and warranties of the Company set forth
     in the Merger Agreement that are qualified by reference to a material
     adverse effect shall not be true and correct, or any such representations
     and warranties that are not so qualified shall not be true and correct in
     any respect that would have a material adverse effect (as defined in the
     Merger Agreement) on the Company and its Subsidiaries taken as a whole, in
     each case as if such representations and warranties were made at the time
     of such determination;

          (d) the Company shall not have performed and complied with in all
     material respects any material agreement or covenant of the Company to be
     performed or complied with by it under this Agreement and shall not have
     cured such default after having been given five business days written
     notice of such default by Purchaser;

          (e) the Merger Agreement shall have been terminated in accordance with
     its terms;

          (f) (i) the Board of Directors of the Company or any committee thereof
     shall have withdrawn or modified in a manner adverse to Purchaser or Merger
     Sub its approval or recommendation of the Offer, the Merger or this
     Agreement or (ii) the Company shall have entered into any agreement with
     respect to any Superior Proposal or (iii) the Board of Directors of the
     Company or any committee therefor shall have resolved to take any of the
     foregoing actions; provided, however, that clauses (i) and (iii) of this
     paragraph (f) shall not apply to or include (x) a determination that a
     Takeover Proposal is a Superior Proposal or (y) giving notice of a Superior
     Proposal to Purchaser as contemplated by Section 9.1(d)(ii) of the Merger
     Agreement; or

          (g) there shall have occurred and continued to exist for at least
     three business 
<PAGE>
 
     days (i) any general suspension of trading in, or limitation on prices for,
     securities on a national securities exchange in the U.S. (excluding any
     coordinated trading halt triggered solely as a result of a specified
     decrease in a market index), (ii) a declaration of a banking moratorium or
     any suspension of payments in respect of banks in the United States,
     (iii) a mandatory limitation by a United States federal Governmental Entity
     or a change in the general financial, banking or capital markets which
     results in a general inability of major financial institutions in the
     United States to fulfill their obligations under commitments to extend
     credit or (iv) or in the case of any of the foregoing existing on the date
     of this Agreement, any material acceleration or worsening thereof;

which, in the sole judgment of Merger Sub in any such case, and regardless of
the circumstances (including any action or omission by Merger Sub) giving rise
to any such condition, makes it inadvisable to proceed with such acceptance for
payment or payments.

          The foregoing conditions in paragraphs (a) through (g) are for the
sole benefit of Merger Sub and Purchaser and may, subject to the terms of this
Agreement, be waived by Merger Sub and Purchaser in whole or in part at any time
and from time to time in their sole discretion.  The failure by Purchaser or
Merger Sub at any time to exercise any of the foregoing rights shall not be
deemed a waiver of any such right, the waiver of any such right with respect to
particular facts and circumstances shall not be deemed a waiver with respect to
any other facts and circumstances and each such right shall be deemed an ongoing
right that may be asserted at any time and from time to time.

<PAGE>
 
                                                                    EXHIBIT 10.2


                                 TAX AGREEMENT
                                 -------------

This TAX AGREEMENT is entered into as of June 18, 1998 by and among Atlantic
Richfield Company, a Delaware corporation ("ARCO"), ARCO Chemical Company, a
Delaware corporation ("ACC") and Lyondell Petrochemical Company, a Delaware
corporation ("Lyondell").

          WHEREAS, ACC and members of the ACC Group are  included in the
consolidated federal income tax returns as well as certain consolidated,
combined, and unitary state and local income tax returns filed by ARCO;

          WHEREAS, ARCO and ACC are parties to an Amended and Restated Tax
Sharing Agreement dated as of January 1, 1995 (the "Tax Sharing Agreement")
which sets forth certain rights and obligations of the parties arising out of
ACC's inclusion in the consolidated, combined, and unitary returns filed by
ARCO;

          WHEREAS, Purchaser, Lyondell Acquisition Corporation, a Delaware
corporation and a wholly-owned subsidiary of Lyondell ("Merger Sub"), and ACC
have entered into an Agreement and Plan of Merger dated as of the date hereof
(the "Merger Agreement") pursuant to which Merger Sub has agreed to make a
tender offer for all the outstanding stock of ACC (the "Offer") and, following
consummation of the Offer, Merger Sub will be merged into ACC (the "Merger");

          WHEREAS, pursuant to a Tender and Voting Agreement dated as of the
date hereof by and among Lyondell, Merger Sub, and ARCO, ARCO has agreed to
tender all its shares in ACC pursuant to the Offer; and

          WHEREAS, the parties hereto desire to affirm the application of the
Tax Sharing Agreement and the Prior Agreement following the purchase of ARCO's
ACC stock pursuant to the Offer (and to confirm that such agreements continue to
apply to taxable years of ACC ending on or prior to such purchase) and to agree
upon certain tax matters arising in connection with and subsequent to the Offer
and the Merger.

          NOW, THEREFORE, in consideration of the premises and of the mutual
covenants and agreements contained herein, the parties to this Tax Agreement
hereby agree as follows:

          1.   Definitions.

         "Purchase" shall mean the purchase by Merger Sub of ARCO's stock in 
ACC pursuant to the Offer or the acquisition of such stock by Lyondell in the
Merger.

         "Purchase Date" shall mean the date on which the Purchase occurs.

         All capitalized terms used in this Agreement and not otherwise defined
herein shall have the meanings set forth in the Tax Sharing Agreement.

         2.   Continuing Effect of Tax Sharing Agreement and Prior Agreement.

         Except as expressly provided herein, the Prior Agreement (attached
hereto along with the Tax Sharing Agreement as Exhibit A) shall continue to
apply to all Taxable Years of the Combined 
<PAGE>
 
Consolidated Group beginning on or after January 1, 1987 and ending on or prior
to December 31, 1994 and the Tax Sharing Agreement shall continue to apply to
all Taxable Years of the Combined Consolidated Group beginning on or after
January 1, 1995. Following the Purchase, Lyondell will comply with Section 12 of
the Tax Sharing Agreement as if it were a party thereto. The Tax Deconsolidation
Agreement between ARCO and ACC, dated May_15, 1998 will be terminated on the
Purchase Date and will have no effect for any taxable year or portion thereof
(whether before or after the Purchase Date).

          3.   Modifications of Tax Sharing Agreement.

          (a) The Tax Sharing Agreement is hereby amended by deleting Section 7
thereof.
          (b) Sections 4(h) and (j) of the Tax Sharing Agreement shall have no
application to Taxable Years beginning on or after January 1, 1998.

          4.   Dual Consolidated Losses.

          (a) ARCO, ACC and Lyondell agree to use their best efforts, prior to
and, if applicable, after the Purchase Date to take, or cause to be taken, all
actions, and to do, or cause to be done, all things necessary or appropriate,
under existing law, regulations or practice to enter into and make effective a
closing agreement with the Internal Revenue Service pursuant to Section 1.1503-
2(g)(2)(iv)(B)(2)(i) - (iii) of the Income Tax Regulations (a "Closing
Agreement") with respect to any dual consolidated loss (within the meaning of
Section 1503 of the Code) of any present or former member of the ACC
Consolidated Group.  Such actions shall include, but not necessarily be limited
to, those specified in this Section 4.  Without limiting the foregoing, ARCO,
ACC and Lyondell shall, as promptly as practicable after the date hereof and in
any event prior to the Purchase Date, prepare and file with the Internal Revenue
Service an application for a Closing Agreement and thereafter shall cooperate in
causing to become effective a Closing Agreement.  Each of ARCO, ACC and Lyondell
shall execute and deliver, or use its best efforts to cause to be executed and
delivered, all instruments, data or information, including any required
certifications, and to make all filings, and obtain all representations or
consents required by the Internal Revenue Service, and to take all such other
actions as may be requested by the Internal Revenue Service from time to time in
order to enter into the Closing Agreement.  Such actions shall include, but not
be limited to, performing the following actions (and supplying a statement to
the Internal Revenue Service in conjunction with the application for the Closing
Agreement that it will perform such actions) required by the Income Tax
Regulations pursuant to which:

          (i)  Lyondell, ACC and ARCO will agree to be jointly and severally 
               liable for the amount of the recapture of dual consolidated
               losses of any present or former member of the ACC Consolidated
               Group and applicable interest charges required by Section 1.1503-
               2(g)(2)(vii) of the Income Tax Regulations if there is a
               triggering event described in Section 1.1503-2(g)(2)(iii);
<PAGE>
 
          (ii) Lyondell will agree to treat any potential recapture amount 
               under Section 1.1503-2(g)(2)(vii) as unrealized built-in gain for
               purposes of Section 384 of the Code, subject to any applicable
               exceptions thereunder; and

         (iii) Lyondell will file the requisite agreements under Section 
               1.1503-2(g)(2)(iv)(B)(2)(iii), signed under penalties of perjury,
               with its timely filed consolidated federal income tax return for
               the year in which the Purchase Date occurs.

ACC agrees to cooperate in any efforts by Lyondell and ARCO to obtain a Closing
Agreement and, if appropriate, to comply with the conditions set forth above and
to become a party to the Closing Agreement.

          (b) In the event that for any reason, including the failure or
inability to enter into a Closing Agreement, any dual consolidated loss (within
the meaning of Section 1503 of the Code) of any present or former member of the
ACC Consolidated Group must be recaptured and/or any interest charge is imposed
pursuant to Section 1.1503-2(g)(2)(vii) or Section 1.1503-2A(d)(4) of the Income
Tax Regulations, ACC and, following the Purchase Date, Lyondell shall be solely
responsible for, and shall indemnify and hold harmless on an after-tax basis
ARCO and each member of the ARCO Consolidated Group from and against, any
resulting tax liability (including any interest charge and any amount for which
ARCO is jointly and severally liable pursuant to a Closing Agreement) and any
interest, penalties, or additions to tax with respect thereto.  Lyondell and ACC
further agree to indemnify and hold harmless on an after-tax basis ARCO and each
member of the ARCO Consolidated Group from and against any tax liability
(including any interest, penalties, or additions to tax) imposed as a result of
conditions prescribed by a Closing Agreement.

          5.   Section 338(h)(10) Election.

          (a) ARCO and Lyondell agree to make a timely election pursuant to
Sections 338(g) and 338(h)(10) of the Code and any similar joint election under
state or local income tax law in which such election is permitted with respect
to the Purchase and the deemed purchase of the stock of the subsidiaries of ACC
as agreed upon by the parties hereto (any such election, a "Section 338(h)(10)
Election").

          (b) No gain or loss recognized by ACC or any other member of the ACC
Consolidated Group on any deemed sale of assets (including a deemed sale of
stock of any direct or indirect subsidiary of ACC) resulting from such
Section_338(h)(10) Election shall be included in the Pro Forma ACC Return or
similar state or local income tax return for ACC's Taxable Year ending on the
Purchase Date.  ARCO shall bear and indemnify ACC and each member of the ACC
Consolidated Group against all taxes (including any interest and penalty) on any
gain or loss recognized on any deemed sale of assets (including a deemed sale of
stock of any direct or indirect subsidiary of ACC) resulting from such Section
338(h)(10) Election.
<PAGE>
 
          (c) ARCO and Lyondell will cooperate with each other to take all
actions necessary and appropriate (including filing Form 8023 and any other such
forms, returns, elections, schedules and other documents as may be required) to
effect the Section 338(h)(10) Elections.  ARCO and Lyondell shall endeavor in
good faith to agree upon the allocation of the "adjusted grossed-up basis" and
the "modified adjusted deemed sales price" (as such terms are defined in
Section_338 of the Code and the Income Tax Regulations thereunder) among the
assets of ACC and the subsidiaries of ACC as agreed upon by the parties hereto
(the "Allocation").  If_ARCO and Lyondell are not able to agree upon the
Allocation within 60 days after the Purchase Date, the Allocation shall be
determined by a big six accounting firm which has no material relationship to
ARCO or Lyondell or any of their respective affiliates and is mutually
acceptable to ARCO and Lyondell.  The costs and expenses for the services of
such accounting firm shall be paid one-half by ARCO and one-half by Lyondell.
The parties hereto and their affiliates shall reflect the Allocation in all tax
returns filed by them.

          6.   Confidentiality.

          The parties hereto agree that any information furnished one another
pursuant to this Agreement is confidential and, except as and to the extent
required during the course of an audit or litigation, shall not be disclosed to
other persons.

          7.   Guarantee.

          Effective as of the Purchase, Lyondell shall (i) cause ACC to perform
all its obligations under, and comply with all terms and provisions of this
Agreement, the Tax Sharing Agreement, and the Prior Agreement and (ii) guarantee
the prompt payment when due of all amounts payable by ACC under such Agreements,
as set forth in the form of Guaranty Agreement attached hereto as Exhibit B
which is being executed and delivered by the parties contemporaneously with the
execution and delivery of this Agreement.

          8.   Successors.

          This Agreement shall be binding upon and inure to the benefit of any
successor to any of the parties, by merger, acquisition of assets or otherwise,
to the same extent as if the successor had been an original party to this
Agreement.

          9.   Tax Law Changes.

          Any alteration, modification, addition, deletion, or other change in
the Code or the Income Tax Regulations (or to applicable state and local tax
provisions) will automatically be applicable to this Agreement when effective.

          10.  Governing Law.

          This Agreement shall be governed by and construed in accordance with
the laws of Delaware.  Each of the parties hereto (i) consents to submit such
party to the exclusive jurisdiction of any Federal court located in the State of
Delaware or any Delaware state court in the event any 
<PAGE>
 
dispute arises out of this Agreement or any of the transactions contemplated
hereby, (ii) agrees that such party will not attempt to deny or defeat such
personal jurisdiction by motion or other request for leave from any such court,
(iii)_agrees that such party will not bring any action relating to this
Agreement or any of the transactions contemplated hereby in any court other than
a Federal court sitting in the state of Delaware or a Delaware state court and
(iv) waives any right to trial by jury with respect to any claim or proceeding
related to or arising out of this Agreement or any of the transactions
contemplated hereby.

          11.  Headings.

          The headings in this Agreement are for convenience only and shall not 
be deemed for any purpose to constitute a part or to affect the interpretation
of this Agreement.

          12.  Counterparts.

          This Agreement may be executed simultaneously in two or more
counterparts, each of which will be deemed an original, and it shall not be
necessary in making proof of this Agreement to produce or account for more than
one counterpart.

          13.  Notices.

          All notices, claim, requests, demands and other communications under
this Agreement shall be in writing and shall be deemed to have been duly given
if and when delivered or mailed (registered or certified mail, postage prepaid,
return receipt requested), as follows:

          (a)  If to ARCO:
          Atlantic Richfield Company
          Attn:  Vice President & General Tax Officer
          515 South Flower Street
          Los Angeles, California 90071

          (b)  If to ACC:
          ARCO Chemical Company
          Attn:  Vice President & General Tax Officer
          3801 West Chester Pike
          Newtown Square, Pennsylvania 19073
<PAGE>
 
          (c)  If to Lyondell:
          Lyondell Petrochemical Company
          Attn: Tax Officer
          Suite 1600
          1221 McKinney
          Houston, Texas  77010

or to such other person or address as the party to whom the communication is to
be given may have previously furnished to the other party in writing.

          14.  Severability.

          If any provision of this Agreement is held to be unenforceable for any
reason, it shall be adjusted rather than voided, if possible, in order to
achieve the intent of the parties to the maximum extent practicable.  In any
event, all other provisions of this Agreement shall be deemed valid, binding and
enforceable to their full extent.

          15.  Termination.

          If the Merger Agreement terminates and the Purchase is not
consummated, this Agreement shall terminate and be of no further force and
effect.
<PAGE>
 
          IN WITNESS WHEREOF, each of the parties to this Agreement has caused
this Agreement to be executed by its duly authorized officer on this date of
June 18, 1998.

                                         ATLANTIC RICHFIELD COMPANY

                                         By: /s/ Terry G. Dallas
                                            ---------------------------
                                         
                                         ARCO CHEMICAL COMPANY

                                         By: /s/ Marvin O. Schlanger
                                            ---------------------------

                                         LYONDELL PETROCHEMICAL COMPANY

                                         By: /s/ Dan F. Smith
                                            ---------------------------

<PAGE>
 
                                                                    EXHIBIT 10.3


                          TENDER AND VOTING AGREEMENT

          TENDER AND VOTING AGREEMENT (this "Agreement"), dated June_18, 1998 by
and between Lyondell Petrochemical Company, a Delaware corporation
("Purchaser"), Lyondell Acquisition Corporation, a Delaware corporation and a
wholly owned subsidiary of Purchaser ("Merger Sub"), and Atlantic Richfield
Company, a Delaware corporation ("Stockholder").

          WHEREAS, capitalized terms used but not defined herein shall have the
meanings set forth in the Merger Agreement;

          WHEREAS, Purchaser, Merger Sub and ARCO Chemical Company, a Delaware
corporation (the "Company"), propose to enter into an Agreement and Plan of
Merger of even date herewith (the "Merger Agreement") pursuant to which Merger
Sub agrees to make a tender offer (the "Offer") for all outstanding shares of
common stock, par value $1.00 per share (the "Company Common Stock"), of the
Company, at $57.75 per share, net to the seller in cash, without interest
thereon and subject to the conditions set forth in the Merger Agreement, to be
followed by a merger of Merger Sub into the Company (the "Merger"), upon the
terms and conditions set forth in the Merger Agreement;

          WHEREAS, as of the date hereof, Stockholder beneficially owns
80,000,001 shares of Company Common Stock (the "Owned Shares");

          WHEREAS, the Board of Directors of the Company has adopted resolutions
approving the Offer, the Merger and, for purposes of Section 203 of the DGCL
(defined in Section 1.2), the Tender and Voting Agreement (as defined below),
recommending that the Company's stockholders accept the Offer and approving the
acquisition of Shares by Merger Sub pursuant to the Offer; and

          WHEREAS, as a condition to their willingness to enter into the Merger
Agreement and to make the Offer, Purchaser and Merger Sub have required that
Stockholder agree to tender all of the Owned Shares pursuant to the Offer,
together with any shares of Company Common Stock acquired after the date hereof
and prior to the termination of the Offer, whether upon the exercise of options,
conversion of convertible securities or otherwise (collectively, the "Shares"),
on the terms and subject to the conditions provided for in this Agreement;

          NOW, THEREFORE, in consideration of the execution and delivery by
Purchaser and Merger Sub of the Merger Agreement and the mutual covenants,
conditions and agreements contained herein and therein, and intending to be
legally bound hereby, the parties agree as follows:
<PAGE>
 
                                   ARTICLE I

                              AGREEMENT TO TENDER

          SECTION 1.1.  Agreement to Tender.  Stockholder hereby agrees that, if
Merger Sub commences the Offer, Stockholder will tender, or cause to be
tendered, and while this Agreement remains in effect shall not withdraw, all of
its Shares to Merger Sub prior to the expiration of the Offer, provided that the
purchase price per Share to be paid pursuant to the Offer shall be no less than
the Offer Price.

          SECTION 1.2  Purchaser's Obligations.  The obligation of Purchaser to
cause Merger Sub to commence the Offer, conduct and consummate the Offer and
accept for payment, and pay for, any Shares tendered and not withdrawn pursuant
to the Offer shall be subject only to the Offer Conditions.  Purchaser shall
comply, and shall cause Merger Sub to comply, with all provisions of Article I
of the Merger Agreement.  Subject to the terms and conditions of the Offer,
Merger Sub shall, and Purchaser shall cause Merger Sub to, accept for payment,
and pay for, all Shares validly tendered and not withdrawn pursuant to the
Offer.  Purchaser shall provide or cause to be provided to Merger Sub on a
timely basis the funds sufficient to accept for payment, and pay for, any and
all Shares that Merger Sub becomes obligated to accept for payment, and pay for,
pursuant to the Offer.  Merger Sub shall make, and Purchaser shall cause Merger
Sub to make, payment to Stockholder of the aggregate purchase price for the
Shares tendered by Stockholder in the Offer on the first Business Day
immediately following the expiration of the Offer by wire transfer of
immediately available funds in US currency to a bank account to be designated in
writing by Stockholder  not less than two Business Days  prior to the expiration
of the Offer.  As used herein, "Business Day" shall mean a day other than a
Saturday, Sunday or other day on which banks in New York, New York are required
to or may be closed and shall consist of the time period from 12:01 a.m. through
12:00 midnight, Eastern time.

                                   ARTICLE II

                                VOTING AGREEMENT

          SECTION 2.1.  Voting.  Stockholder hereby agrees that, during the time
this Agreement is in effect, at any meeting of the stockholders of the Company,
however called, and at every adjournment or postponement thereof, and in any
action by written consent of the stockholders of the Company, it shall
(i)_appear at the meeting or otherwise cause the Shares to be counted as present
thereat for purposes of establishing a quorum, (ii)_vote its Shares in favor of
the Merger and approval and adoption of the Merger Agreement, and any action
required in furtherance thereof, (iii)_vote its Shares against any action or
agreement that would result in a breach in any material respect of any
representation, warranty or covenant of the Company in the Merger Agreement, and
(iv)_vote its Shares against any action or agreement (other than the Merger
Agreement or the transactions contemplated thereby) that would impede, interfere
with, delay, postpone or attempt to discourage the Merger or the Offer,
including any other extraordinary 
<PAGE>
 
corporate transaction, such as a merger, reorganization or liquidation involving
the Company and a third party or any other proposal of a third party to acquire
the Company.

          SECTION 2.2.  Irrevocable Proxy.  As security for Stockholder's
obligations under Section 2.1 hereof, Stockholder hereby irrevocably constitutes
and appoints Purchaser as its attorney and proxy pursuant to the provisions of
Section 212(c) of the Delaware General Corporation Law ("DGCL"), with full power
of substitution and resubstitution, to vote the Shares at any meeting of
stockholders of the Company, however called, or in connection with any action by
written consent by the stockholders of the Company, in each case only as and to
the extent provided in clauses (i), (ii) and (iii) of Section 2.1 hereof;
provided, however, that, without limiting the foregoing, in any such vote or
other action pursuant to such proxy, the Purchaser shall not in any event have
the right (and such proxy shall not confer the right) to vote against the
Merger, to vote to reduce the Offer Price or the Merger Consideration or
otherwise modify or amend the Merger Agreement to reduce the rights or benefits
of the Company or any stockholders of the Company (including Stockholder) under
the Offer or the Merger Agreement or to reduce the obligations of Purchaser
thereunder; and provided, further, that the proxy granted pursuant to this
Section 2.2 shall irrevocably cease and shall be of no further force or effect
upon (x) any breach by Purchaser of any of its obligations under Section 1.1(a)
of the Merger Agreement, (y) any violation by Purchaser of any of the terms of
this Agreement or (z) the termination of the Merger Agreement or this Agreement
in accordance with its terms.  THIS PROXY AND POWER OF ATTORNEY IS IRREVOCABLE,
SUBJECT TO THE FOREGOING AND SECTION 3.1 HEREOF, AND COUPLED WITH AN INTEREST.
Stockholder hereby revokes all other proxies and powers of attorney with respect
to Stockholder's Shares that it may have heretofore appointed or granted, and no
subsequent proxy or power of attorney shall be given or written consent executed
(and if given or executed, shall not be effective) by Stockholder with respect
thereto, other than as contemplated by Section 2.1 hereof.

                                  ARTICLE III

                                  TERMINATION

          SECTION 3.1.  Termination.  (a)  This Agreement shall terminate on the
earlier of (i) payment to Stockholder of the full purchase price for the Shares
as provided in the next to last sentence of Section 1.1 hereof, (ii) the
consummation of the Merger, and (iii) the termination of the Merger Agreement in
accordance with its terms.

          (b)  This Agreement may be terminated by Stockholder if Purchaser
shall  have failed to comply with any of its obligations under Section 1.1(a) of
the Merger Agreement.
<PAGE>
 
          SECTION 3.2.  Effect of Termination.  In the event of a termination of
this Agreement as provided in Section 3.1 hereof, this Agreement shall forthwith
become void and there shall be no liability or obligation on the part of
Purchaser, Merger Sub or Stockholder or their respective officers or directors
hereunder thereafter; provided, however, that if Purchaser has accepted the
Shares for payment pursuant to the Offer, Purchaser shall be obligated to comply
with the requirements of the next to last sentence of Section 1.1 hereof;
provided, further, however, that nothing herein shall relieve any party for
liability for any breach hereof prior to such termination; provided, further,
however, that the obligations set forth in Section 5.4 (insofar as they relate
to Sections 7.5(b), 7.5(d) and 7.8(e) of the Merger Agreement) shall survive any
termination of this Agreement pursuant to Section 3.1(a)(i) or Section
3.1(a)(ii) hereof.

                                   ARTICLE IV

                         REPRESENTATIONS AND WARRANTIES

          SECTION 4.1.  Representations and Warranties of Purchaser and Merger
Sub.  Purchaser and Merger Sub hereby jointly and severally represent and
warrant to Stockholder as follows:

          (a)  Organization, Due Authorization.  Purchaser is a company duly
organized, validly existing and in good standing under the laws of Delaware.
Purchaser has full corporate power and authority to execute and deliver this
Agreement.  The execution and delivery of this Agreement and the consummation of
the transactions contemplated hereby have been duly and validly authorized by
the Board of Directors of Purchaser, and no other corporate proceedings on the
part of Purchaser are necessary to authorize this Agreement or to consummate the
transactions contemplated hereby.  This Agreement has been duly and validly
executed and delivered by Purchaser and constitutes a valid and binding
agreement of purchaser, enforceable against Purchaser in accordance with its
terms.

          (b)  Organization, Due Authorization.  Merger Sub is a company duly
organized, validly existing and in good standing under the laws of Delaware.
Merger Sub has full corporate power and authority to execute and deliver this
Agreement.  The execution and delivery of this Agreement and the consummation of
the transactions contemplated hereby have been duly and validly authorized by
the Board of Directors of Merger Sub, and no other corporate proceedings on the
part of Merger Sub are necessary to authorize this Agreement or to consummate
the transactions contemplated hereby.  This Agreement has been duly and validly
executed and delivered by Merger Sub and constitutes a valid and binding
agreement of purchaser, enforceable against Merger Sub in accordance with its
terms.

          (c)  No Conflicts.  Other than in connection with or in compliance
with the provisions of the DGCL with respect to the transactions contemplated
hereby, the Exchange Act, the securities laws of the various states, the HSR Act
and foreign laws, no authorization, consent or approval of, or filing with, any
court or any public body or authority is necessary for the consummation by
<PAGE>
 
Purchaser or Merger Sub of the transactions contemplated by this Agreement.  The
execution, delivery and performance of this Agreement by Purchaser or Merger Sub
will not constitute a breach, violation or default (or any 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 result in the creation of any
lien or encumbrance upon any of the properties or assets of Purchaser or Merger
Sub under, any note, bond, mortgage, indenture, deed of trust, license, lease,
agreement or other instrument to which Purchaser or Merger Sub is a party or by
which their respective properties or assets are bound, other than breaches,
violations, defaults, terminations, accelerations or creation of liens and
encumbrances which, in the aggregate, would not materially impair the ability of
Purchaser or Merger Sub (as the case may be) to perform its obligations
hereunder.

          SECTION 4.2.  Representations and Warranties of Stockholder.
Stockholder hereby represents and warrants to Purchaser and Merger Sub as
follows:

          (a)  Organization, Due Authorization.  Stockholder is a company duly
organized, validly existing and in good standing under the laws of Delaware.
Stockholder has full corporate power and authority to execute and deliver this
Agreement.  The execution and delivery of this Agreement and the consummation of
the transactions contemplated hereby have been duly and validly authorized by
the Board of Directors of Stockholder, and no other corporate proceedings on the
part of Stockholder are necessary to authorize this Agreement or to consummate
the transactions contemplated hereby.  This Agreement has been duly and validly
executed and delivered by Stockholder and constitutes a valid and binding
agreement of Stockholder, enforceable against Stockholder in accordance with its
terms.

          (b)  Title; Voting Rights.  Such Stockholder has good and valid title
to the Owned Shares, free and clear of any lien, charge, encumbrance or claim of
whatever nature (other than the Stock Repurchase Agreement) and, upon the
purchase of the Shares by Merger Sub, Stockholder will deliver good and valid
title to the Shares, free and clear of any lien, charge, encumbrance or claim of
whatever nature.  Except pursuant to this Agreement, the Owned Shares are not
subject to any voting trust agreement or other contract, agreement, arrangement,
commitment or understanding restricting or otherwise relating to the voting,
dividend rights or disposition of the Owned Shares (other than the Stock
Repurchase Agreement).

          (c)  Ownership of shares of Company Common Stock.  On the date hereof,
Stockholder owns, of record or beneficially, 80,000,001 shares of Common Stock.
Stockholder has sole voting power and sole power of disposition with respect to
the Owned Shares, with no restrictions, subject to applicable federal securities
laws, on its rights of disposition pertaining thereto (other than the Stock
Repurchase Agreement).
<PAGE>
 
          (d)  No Conflicts.  Other than in connection with or in compliance
with the provisions of the DGCL with respect to the transactions contemplated
hereby, the Exchange Act, the securities or takeover laws of the various states,
the HSR Act and foreign laws, no authorization, consent or approval of, or
filing with, any court or any public body or authority is necessary for the
consummation by Stockholder of the transactions contemplated by this Agreement.
The execution, delivery and performance of this Agreement by Stockholder will
not constitute a breach, violation or default (or any 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 result in the creation of any lien or
encumbrance upon any of the properties or assets of Stockholder under, any note,
bond, mortgage, indenture, deed of trust, license, lease, agreement or other
instrument to which Stockholder is a party or by which its properties or assets
are bound, other than breaches, violations, defaults, terminations,
accelerations or creation of liens and encumbrances which, in the aggregate,
would not materially impair the ability of Stockholder to perform its
obligations hereunder.

                                   ARTICLE V

                            COVENANTS OF STOCKHOLDER

          Stockholder hereby covenants and agrees as follows:

          SECTION 5.1.  Restriction on Transfer, Proxies and Non-Interference.
Stockholder hereby agrees, while this Agreement is in effect, and except as
contemplated hereby, not to (i) sell, transfer, pledge, encumber, assign or
otherwise dispose of, or enter into any contract, option or other arrangement or
understanding with respect to the sale, transfer, pledge, encumbrance,
assignment or other disposition of, any of its Owned Shares or Shares, (ii)
grant any proxies, powers of attorney or other authorization or consent, deposit
any shares of capital stock of the Company into a voting trust or enter into a
voting agreement with respect to any such  Shares or (iii) take any action that
would make any representation or warranty of Stockholder contained herein untrue
or incorrect or have the effect of preventing or disabling Stockholder from
performing its obligations under this Agreement.

          SECTION 5.2.  Additional Shares.  Stockholder hereby agrees, while
this Agreement is in effect, to promptly notify Purchaser and Merger Sub of the
number of new shares of Company Common Stock acquired by Stockholder, if any,
after the date hereof.

          SECTION 5.3.  No Solicitation.  Stockholder shall, and shall direct
and use reasonable efforts to cause its officers, directors, employees,
representatives, subsidiaries and agents to, immediately cease any discussions
or negotiations with any parties other than Purchaser and Merger Sub that may be
ongoing with respect to a Takeover Proposal.  While this Agreement is in effect,
Stockholder shall not, and shall not authorize or permit any of its officers,
directors, 
<PAGE>
 
subsidiaries or employees or any investment banker, financial advisor, attorney,
accountant or other representative retained by it or any of them to, directly or
indirectly, (i) solicit, initiate or encourage any inquiries or the making of
any proposal that constitutes, or may reasonably be expected to lead to, any
Takeover Proposal, or (ii) participate in any discussions or negotiations
regarding any Takeover Proposal; provided, however, that if, at any time prior
to the acceptance for payment of shares of Company Common Stock pursuant to the
Offer, Stockholder determines in good faith, after consultation with its
financial advisers, that a Takeover Proposal that has not been solicited,
initiated or encouraged after the date hereof in violation of clause (i) above
(or Section 6.2 of the Merger Agreement) constitutes a Superior Proposal,
Stockholder and the Company may (x) furnish information with respect to the
Company and its Subsidiaries to the third party that has made such Takeover
Proposal (and to any investment banker, financial advisor, attorney, accountant
or other representative retained by such party) pursuant to a customary and
reasonable confidentiality agreement and (y) participate in negotiations
regarding such Takeover Proposal.

          SECTION 5.4.  Merger Agreement.  Stockholder agrees to perform the
obligations of Parent set forth in Sections 7.5(b), 7.5(d), 7.8(e), 7.9 and 7.10
of the Merger Agreement.

                                   ARTICLE VI

                                OTHER AGREEMENTS

          SECTION 6.1.  Further Assurances.  From time to time, at the other
party's request and without further consideration, each party hereto shall
execute and deliver such additional documents and take all such further action
as may be necessary or desirable to consummate and make effective the
transactions contemplated by Article I and Article II of this Agreement.

          SECTION 6.2.  Public Announcements. Each of Purchaser, Merger Sub and
Stockholder Agrees that it will not issue any press release or otherwise make
any public statement with respect to this Agreement or the transactions
contemplated hereby without the prior consent of the other party, which consent
shall not be unreasonably withheld or delayed; provided, however, that such
disclosure can be made without obtaining such prior consent if (i) the
disclosure is required by law or by obligations imposed pursuant to any listing
agreement with the new York Stock Exchange and (ii) the party making such
disclosure has first used its best efforts to consult with the other party about
the form and substance of such disclosure.

                                  ARTICLE VII

                                 MISCELLANEOUS
<PAGE>
 
          SECTION 7.1.  Non-Survival.  The respective representations and
warranties made herein shall terminate upon (x) Stockholder's sale of the Shares
to Merger Sub in the Offer or (y) the termination of this Agreement.

          SECTION 7.2.  Entire Agreement; Assignment.  This Agreement
constitutes the entire agreement among the parties with respect to the subject
matter hereof and supersedes all other prior agreements and understandings, both
written and oral, among the parties with respect to the subject matter hereof.
Neither this Agreement nor any of the rights, interests or obligations hereunder
shall be assigned by any of the parties without the prior written consent of the
other parties, except that Merger Sub may assign its rights and obligations
hereunder to Purchaser or any direct or indirect wholly-owned subsidiary of
Purchaser.

          SECTION 7.3.  Notices.  All notices, requests, claims, demands and
other communications hereunder shall be in writing and shall be given (and shall
be deemed do have been duly received if so given) by hand delivery, telegram,
telex or telecopy, by mail (registered or certified mail, postage prepaid,
return receipt requested) or by any courier service, such as Federal Express,
providing proof of delivery.  All communications hereunder shall be delivered to
the respective parties at the following addresses:
<PAGE>
 
          To Stockholder as follows:

                John Lucas, Esq.

                Atlantic Richfield Company

                515 South Flower Street

                Los Angeles, California  90071

          Copy to:

                Ed Kaufmann, Esq.

                Hughes Hubbard & Reed, LLP

                One Battery Park Plaza

                New York, New York  10004

          To Purchaser or Merger Sub:

                Kerry A. Galvin, Esq.

                Lyondell Petrochemical Company

                1221 McKinney Street

                Houston, Texas,  77010

          Copy to:

                Stephen A. Massad, Esq.

                Baker & Botts, L.L.P.

                One Shell Plaza
<PAGE>
 
                910 Louisiana Street

                Houston, Texas  77002


          SECTION 7.4.  Governing Law; Jurisdiction.  This Agreement shall be
governed by and construed in accordance with the laws of the State of Delaware,
without regard to the principles of conflicts of laws thereof.  Each of the
parties hereto (i) consents to submit itself to the personal jurisdiction of
any federal court located in the State of Delaware or any Delaware state court
in the event any dispute arises out of this Agreement or any of the transactions
contemplated hereby, and consents to service of process by notice as provided in
this Agreement, (ii) agrees that it will not attempt to deny or defeat such
personal jurisdiction by motion or other request for leave from any such court
and (iii) agrees that it will not bring any action relating to this Agreement or
any of the transactions contemplated hereby in any court other than a federal or
state court sitting in the State of Delaware.

          SECTION 7.5.  Counterparts.  This Agreement may be executed in two or
more counterparts, all of which shall be 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 parties, it being
understood that all parties need not sign the same counterpart.

          SECTION 7.6.   Descriptive headings.  The descriptive headings used
hereby are inserted for convenience of reference only and are not intended to be
part of or to effect the meaning or interpretation of this Agreement.

          SECTION 7.7.  Severability.  Whenever possible, each provision or
portion of any provision of this Agreement will be interpreted in such manner as
to be effective and valid under applicable law but if any provision or portion
of any provision of this Agreement is held to be invalid, illegal or
unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability will not affect
any other provision or portion of any provision in such jurisdiction, and this
Agreement will be reformed, construed and enforced in such jurisdiction as if
such invalid, illegal or unenforceable provision or portion of any provision had
never been contained herein.
<PAGE>
 
          IN WITNESS WHEREOF, Purchaser, Merger Sub and Stockholder have caused
this Agreement to be duly executed as of the day and year first above written.

                                 LYONDELL PETROCHEMICAL COMPANY

                                 By: /s/ Dan F. Smith
                                    -------------------------------------------
                                    Name:  Dan F. Smith
                                    Title: President and Chief Executive Officer

                                 LYONDELL ACQUISITION CORPORATION

                                 By: /s/ Dan F. Smith
                                    -------------------------------------------
                                    Name:  Dan F. Smith
                                    Title: President and Chief Executive Officer

                                 ATLANTIC RICHFIELD COMPANY

                                 By: /s/ Terry G. Dallas
                                    -------------------------------------------
                                    Name:  Terry G. Dallas
                                    Title: Senior Vice President and Treasurer

<PAGE>
 
                                                    [LYONDELL LOGO APPEARS HERE]


                 [NEWS PRESS RELEASE LETTERHEAD APPEARS HERE]




                   LYONDELL TO ACQUIRE ARCO CHEMICAL COMPANY,
                  WORLD'S LARGEST PRODUCER OF PROPYLENE OXIDE
                                        
HIGHLIGHTS:
 .  LYONDELL GAINS PREEMINENT, GLOBAL MARKET POSITION IN PROPYLENE OXIDE AND
   OTHER INTERMEDIATE AND SPECIALTY CHEMICALS, DRIVEN BY ADVANTAGED TECHNOLOGY
   POSITION.

 .  PROVIDES VERTICAL INTEGRATION WITH PROPYLENE, ETHYLENE AND BENZENE PRODUCED
   BY EQUISTAR CHEMICALS, LP, OF WHICH LYONDELL OWNS 41%.

 .  FURTHER REDUCES CYCLICALITY OF LYONDELL'S EARNINGS BY BROADENING PRODUCT MIX.

 .  PROVIDES PLATFORM FOR FUTURE DOMESTIC AND INTERNATIONAL GROWTH.

     HOUSTON, (June 18, 1998) -- Lyondell Petrochemical Company (NYSE:LYO) today
announced a definitive agreement to acquire ARCO Chemical Company, a $4 billion
worldwide chemical producer, through a cash tender offer valued at $5.6 billion.

     Under the terms of the agreement, Lyondell will conduct a tender offer for
all outstanding shares of ARCO Chemical at a price of $57.75 per share.  As part
of the transaction, Lyondell will assume ARCO Chemical's debt of approximately
$870 million. The tender offer will begin on June 24.  Atlantic Richfield
Company (ARCO), which owns 82.2 percent of the outstanding shares of ARCO
Chemical, has agreed to tender its shares to Lyondell.  Subject to customary
conditions, the transaction is expected to close early in the third quarter.
Any shares not tendered will be acquired in a second-step merger for cash at the
same price.

MAJOR STEP IN LYONDELL STRATEGY TO INCREASE SHAREHOLDER VALUE

  "We believe this represents a unique opportunity to create value for
Lyondell's shareholders. It is a major step in our strategy to grow and
diversify Lyondell's earnings base. It  further reduces the effects of the
business cycles on our earnings by expanding into more profitable derivatives
for the products we produce through our other businesses," said Dan F. Smith,
Lyondell's President and Chief Executive Officer.

                                       1
<PAGE>
 
     "This transaction will be significantly accretive to Lyondell's earnings,"
Smith said.  "It expands the company into important new product lines, adds a
significant technology component and provides us with a broader base for
domestic and international growth.    The acquisition complements our other
businesses, since it is a significant consumer of propylene, ethylene and
benzene, major products produced by Equistar, as well as methanol, produced by
Lyondell Methanol Company.  We believe there is additional value that can be
captured through further cost reduction by integrating ARCO Chemical's
operations with Lyondell's and Equistar's.  In addition, Lyondell expects to
realize significant tax benefits resulting from the transaction structure."

     "We are excited about adding the experienced employees from ARCO Chemical
to the Lyondell team and believe this new structure will provide more
opportunities for all employees of the new Lyondell and its venture companies.
Our expanded product portfolio will enable us to continue to add value to
customers of both organizations," Smith said.

PREMIER WORLDWIDE POSITIONS IN GROWING MARKETS

  Lyondell and ARCO Chemical were once operated together as part of Atlantic
Richfield Company.  The operations were segregated in 1985 and each became a
public company shortly thereafter. ARCO Chemical has preeminent market positions
in several leading chemical areas, including:

 .  The world's largest producer of propylene oxide (PO), a core product for
   urethane foams and a wide variety of other consumer and industrial
   applications.

 .  The world's number two supplier of polyols and TDI (toluene diisocyanate),
   key ingredients in urethanes.

 .  A leading producer of propylene glycol, an important propylene oxide (PO)
   derivative used in fiberglass resins, pharmaceutical and cosmetic additives,
   and for aircraft deicers and automotive anti-freeze.

 .  A leading producer of other PO derivatives such as BDO (butanediol) and PGE
   (propylene glycol ether) used in specialty resin and solvent applications.

 .  As a co-product of PO production, the company also produces styrene monomer
   and MTBE.

  ARCO Chemical operates or participates in 11 manufacturing facilities in 7
countries.

                                       2
<PAGE>
 
FINANCING ARRANGEMENTS

     Initially, Lyondell will finance the transaction through bank financing led
by J.P. Morgan Securities Inc., Donaldson, Lufkin & Jenrette Securities
Corporation, The Chase Manhattan Bank, Bank of America, Citibank, N.A., and
NationsBank, N.A. Following the close of the transaction, portions of the bank
financing are expected to be repaid through the issuance by Lyondell of equity
and other securities.   Management believes that the additional equity, as well
as the rapid pay down of debt with the significant cash flows generated from all
of Lyondell's businesses, will enable the company to maintain a conservative
financial structure.

TRANSACTION CONTINUES LYONDELL LEADERSHIP IN INDUSTRY RESTRUCTURING

  The acquisition of ARCO Chemical is the third major deal executed by Lyondell
in the past year as part of the company's strategy to reduce cyclicality and
strengthen earnings and cash flow in all parts of the business cycle.

  In December 1997, Lyondell formed Equistar Chemicals, LP as a joint venture
with Millennium Chemicals, Inc., creating one of the world's largest producers
of ethylene, propylene and polyethylene.  Occidental Petroleum Corporation
joined the Equistar partnership in May 1998, further increasing the size and
strength of the business.   With 41% interest, Lyondell has the largest
ownership position in Equistar and Dan Smith serves as Chief Executive Officer.
Lyondell is also majority owner with a 58.75% stake in LYONDELL-CITGO Refining
Company, a venture with CITGO Petroleum Corporation.  With the addition of ARCO
Chemical, Lyondell's businesses and joint ventures will together have $13
billion in annual revenues.

  J.P. Morgan acted as exclusive financial advisor for Lyondell in this
transaction.

LYONDELL PETROCHEMICAL COMPANY is a major chemical and refining company, with
majority ownership positions in the premier olefins, polymers and refining
companies in North America.  Lyondell is:

 .  The largest producer of ethylene, propylene and polyethylene in North America
   and a leading producer of high value-added specialty polymers, color
   concentrates and polymeric powder through its 41% interest in Equistar
   Chemicals, LP.

 .  One of the largest and most profitable refiners in the United States,
   processing very heavy Venezuelan crude oil to produce gasoline, low sulfur
   diesel and jet fuel, through its 58.75% interest in LYONDELL-CITGO Refining
   Company Ltd.

 .  The third largest methanol producer in the U.S., through its 75% interest in
   Lyondell Methanol Company L.P.

Lyondell is headquartered in Houston, Texas.

                                    #  #  #

     For information, contact:   Media - Jackie Wilson (713) 652-4596 or 
   Christine McGee (713) 652-4156 Investors - Kevin DeNicola (713) 652-4590

                                       3
<PAGE>
 
                     ATTACHMENT 1: PRODUCTS AND CAPACITIES
                                        
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
ARCO Chemical Worldwide Capacity of Key Products
- --------------------------------------------------------------------------------------------------------------------------
Million pounds per year
 
                                                                                       Domestic      Foreign       Total
<S>                                                     <C>                           <C>           <C>          <C>
Propylene Oxide and derivatives                         PO                                  2,445        1,395       3,840
                                                        Polyols                               740          610       1,350
                                                        PG                                    565          345         910
                                                        PGE                                   120          155         275
                                                        Butanediol                            120                      120
Toluene diisocyanate                                    TDI                                   250                      250
                                                        TDI Marketing - Europe                             264         264
 
Methyl tertiary butyl ether                             MTBE (Bbls/day)                    30,000       28,500      58,500
 
Styrene monomer**                                       SM                                  2,820          830       3,650
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>
** As of May 15, 1998, approximately 1.5 billion pounds, or 40 percent of
   capacity, is committed under long-term processing arrangements.

                                       4
<PAGE>
 
                     ATTACHMENT 2: MANUFACTURING LOCATIONS

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------
                       ARCO Chemical Manufacturing Locations
- -----------------------------------------------------------------------------------
LOCATION                                                    MAJOR PRODUCTS
<S>                                               <C>
NORTH AMERICA
 
Channelview, TX                                   Propylene Oxide (PO)
                                                  Styrene Monomer (SM)
                                                  MTBE
                                                  Polyols
                                                  Allyl Alcohol
                                                  Butanediol (BDO)
                                                  Tetrahydrofuran (THF)
                                                  N-Methyl-2-pyrrolidone (NMP)
                                                  Gamma-Butyrolactone (GBL)
                                                  MPDiol Glycol (MPD)
                                                  n-Propanol (NPR)
 
Institute, WV                                     Base Polyols
 
South Charleston, WV                              Polyols (Base/Polymer)
 
Lake Charles, LA                                  Toluene Diisocyanate (TDI)
                                                  Aliphatic Diisocyanates (ADI)
 
Pasadena, TX                                      Propylene Oxide (PO)
                                                  Tertiary Butyl Alcohol (TBA)
                                                  Isobutylene
                                                  Propylene Glycols (PG)
                                                  Propylene Glycol Ether (PGE)
                                                  TBHP
                                                  TEBOL-99 TBA
                                                  Propylene Carbonate
 
EUROPE
 
Fos-sur-Mer, France                               Propylene Oxide (PO)
                                                  Tertiary Butyl Alcohol (TBA)
                                                  Propylene Glycols (PG)
                                                  MTBE
                                                  Polyols
 
Rieme, Belgium                                    Polyols
 
Rotterdam, The Netherlands                        Propylene Oxide (PO)
                                                  Tertiary Butyl Alcohol (TBA)
                                                  Isobutylene
                                                  Propylene Glycols (PG)
                                                  MTBE
                                                  Propylene Glycol Ether (PGE)
                                                  TBHP
- -----------------------------------------------------------------------------------
</TABLE>

                                       5
<PAGE>
 
<TABLE>
<CAPTION>
 
ASIA PACIFIC
<S>                                               <C>
Anyer, Indonesia (Joint Venture with P.T. Gema    Polyols
Supra Abadi)
 
Chiba, Japan (50/50 Joint Venture with            Propylene Oxide
Sumitomo Chemical Corp.)                          Styrene Monomer
 
Kaohsiung, Taiwan                                 Polyols
- -----------------------------------------------------------------------------------
</TABLE>

                                       6
<PAGE>
 
        ATTACHMENT 2A: RELATED EQUISTAR CHEMICAL MANUFACTURING LOCATIONS

<TABLE>
<CAPTION>
LOCATION                                            PRODUCTS
<S>                                               <C>
 
NORTH AMERICA
 
Channelview, TX                                   Ethylene
                                                  Propylene
                                                  Butadiene
                                                  Benzene
                                                  Toluene
                                                  Dicyclopentadiene (DCPD)
                                                  Isoprene
                                                  Resin oil
                                                  Piperylenes
                                                  Alkylate
                                                  MTBE
 
Pasadena, Texas (Bayport plant)                   Polypropylene
                                                  Low-density polyethylene
                                                  Polyols (Base/Polymer)
 
Pasadena, Texas                                   Ethylene oxide
(Bayport Industrial District)                     Ethylene glycol
                                                  Ethylene oxide derivatives
- -----------------------------------------------------------------------------------
</TABLE>

                                       7
<PAGE>
 
                         ATTACHMENT 3: LYONDELL HISTORY

1985     Lyondell formed as a division of ARCO from the commodity olefins
         operations and refinery in Houston.

1989     50.1% of Lyondell shares sold to the public; ARCO retained 49.9% of
         shares.
 
1990     Low-density polyethylene and polypropylene facility acquired from
         Rexene, first step in strategic plan to diversify into key derivatives
         markets.

1993     Lyondell finalizes agreement with Petroleos de Venezuela (PDVSA) to
         create LYONDELL-CITGO Refining Company Ltd., representing major step in
         strategic plan to enhance value of refining asset.
 
1994     ARCO completes an offering of three-year debt securities exchangeable
         upon maturity, into the Lyondell common stock they held.
 
1995     Lyondell acquired Alathon high-density polyethylene business from
         Occidental Chemical Corporation, major step in strategic plan to
         enhance value of the petrochemicals business.
 
1996     Lyondell finalizes agreement with MCN Investment Corporation to enhance
         value of Lyondell's methanol asset. Created Lyondell Methanol Company,
         L.P., of which Lyondell owns 75%.
 
1997     ARCO exchanges debt for Lyondell stock held by ARCO, eliminating ARCO's
         ownership interest in Lyondell.
 
         $1 billion upgrade project completed at LYONDELL-CITGO Refining
         Company, creating world's premier heavy crude oil processing facility.
         Lyondell has approximate 58.75% interest in LCR.
 
         Lyondell completes partnership transaction with Millennium Chemicals,
         Inc. to form Equistar Chemicals, LP, by combining both companies'
         olefins and polymers businesses. Equistar becomes the largest and one
         of the lowest cost producers of ethylene and polyethylene in North
         America.
 
1998     Lyondell completes agreement to expand Equistar with the addition of
         the ethylene, propylene and ethylene oxide and derivatives businesses
         of Occidental Chemical Corporation. The expansion makes Equistar the
         world's second largest ethylene producer, with total annual revenues of
         almost $6 billion. Lyondell owns 41% of Equistar Chemicals.

         Lyondell announces agreement to acquire ARCO Chemical through a cash
         tender offer valued at $5.6 billion.

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