INTERNATIONAL SPECIALTY PRODUCTS INC
SC 13D/A, 1998-04-01
INDUSTRIAL ORGANIC CHEMICALS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

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

                               (AMENDMENT NO. 2)*



                      INTERNATIONAL SPECIALTY PRODUCTS INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

             COMMON STOCK                                   460334 10 5
- --------------------------------------------------------------------------------
    (Title of class of securities)                         (CUSIP number)


                            RICHARD A. WEINBERG, ESQ.
                           ISP MANAGEMENT COMPANY INC.
                                 1361 ALPS ROAD
                             WAYNE, NEW JERSEY 07480
                                 (973) 628-3520
- --------------------------------------------------------------------------------
      (Name, address and telephone number of person authorized to receive
                          notices and communications)


                                 MARCH 30, 1998
- --------------------------------------------------------------------------------
             (Date of event which requires filing of this statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission. See Rule 13d-1(a) for other parties to whom copies are to be
sent.

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this page shall not be deemed to be
"filed" for the purpose of Section 18 of the Securities Exchange Act of 1934
("Act") or otherwise subject to the liabilities of that section of the Act but
shall be subject to all other provisions of the Act (however, see the Notes).


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


NYFS01...:\01\47201\0035\2377\SCH0217W.19B
<PAGE>
- -------------------------------           --------------------------------------
CUSIP No.  460334 10 5                            SCHEDULE 13D-Page 1
- -------------------------------           --------------------------------------

- --------------------------------------------------------------------------------
  1        NAME OF REPORTING PERSON:                 SAMUEL J. HEYMAN

           S.S. OR I.R.S. IDENTIFICATION NO.
           OF ABOVE PERSON:
- --------------------------------------------------------------------------------
  2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:*         (A)[X]
                                                                      (B)[_]
- --------------------------------------------------------------------------------
  3        SEC USE ONLY

- --------------------------------------------------------------------------------
  4        SOURCE OF FUNDS:*             OO

- --------------------------------------------------------------------------------
  5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
           PURSUANT TO ITEM 2(d) OR 2(e):                                  [_]
           
- --------------------------------------------------------------------------------
  6        CITIZENSHIP OR PLACE OF                   USA
           ORGANIZATION:

- --------------------------------------------------------------------------------
  NUMBER OF           7    SOLE VOTING POWER:                   0
    SHARES
                   -------------------------------------------------------------
 BENEFICIALLY         8    SHARED VOTING POWER:                 80,715,000
   OWNED BY
                   -------------------------------------------------------------
     EACH             9    SOLE DISPOSITIVE POWER:              0
  REPORTING
                   -------------------------------------------------------------
 PERSON WITH         10    SHARED DISPOSITIVE POWER:            80,715,000

- --------------------------------------------------------------------------------
 11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY               80,715,000
           EACH REPORTING PERSON:

- --------------------------------------------------------------------------------
 12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN   [_]
           SHARES:*

- --------------------------------------------------------------------------------
 13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):            83.9%

- --------------------------------------------------------------------------------
 14        TYPE OF REPORTING PERSON:*                  IN

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


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
<PAGE>
- -------------------------------           --------------------------------------
CUSIP No. 460334 10 5                               SCHEDULE 13D-Page 2
- -------------------------------           --------------------------------------

- --------------------------------------------------------------------------------
 1        NAME OF REPORTING PERSON:                 ISP HOLDINGS INC.

          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON:
- --------------------------------------------------------------------------------
 2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:*          (A) [X]
                                                                      (B) [_]
- --------------------------------------------------------------------------------
 3        SEC USE ONLY

- --------------------------------------------------------------------------------
 4        SOURCE OF FUNDS:*             OO

- --------------------------------------------------------------------------------
 5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
          PURSUANT TO ITEM 2(d) OR 2(e):                                   [_]
          
- --------------------------------------------------------------------------------
 6        CITIZENSHIP OR PLACE OF                   DE
          ORGANIZATION:

- --------------------------------------------------------------------------------
 NUMBER OF           7    SOLE VOTING POWER:                   0
   SHARES
                  --------------------------------------------------------------
BENEFICIALLY         8    SHARED VOTING POWER:                 80,500,000
  OWNED BY
                  --------------------------------------------------------------
    EACH             9    SOLE DISPOSITIVE POWER:              0
 REPORTING
                  --------------------------------------------------------------
PERSON WITH         10    SHARED DISPOSITIVE POWER:            80,500,000

- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY               80,500,000
          EACH REPORTING PERSON:

- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN    [_]
          SHARES:*

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):             83.8%

- --------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON:*                  CO

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


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
<PAGE>
- -------------------------------           --------------------------------------
CUSIP No.  460334 10 5                             SCHEDULE 13D-Page 3
- -------------------------------           --------------------------------------

- --------------------------------------------------------------------------------
 1        NAME OF REPORTING PERSON:                 HEYMAN JOINT VENTURE

          S.S. OR I.R.S. IDENTIFICATION NO.
          OF ABOVE PERSON:
- --------------------------------------------------------------------------------
 2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:*         (A) [_]
                                                                     (B) [X]
- --------------------------------------------------------------------------------
 3        SEC USE ONLY

- --------------------------------------------------------------------------------
 4        SOURCE OF FUNDS:*             WC

- --------------------------------------------------------------------------------
 5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
          PURSUANT TO ITEM 2(d) OR 2(e):                                   [_]
          
- --------------------------------------------------------------------------------
 6        CITIZENSHIP OR PLACE OF                   CT
          ORGANIZATION:

- --------------------------------------------------------------------------------
 NUMBER OF           7    SOLE VOTING POWER:                   0
   SHARES
                  --------------------------------------------------------------
BENEFICIALLY         8    SHARED VOTING POWER:                 125,000
  OWNED BY
                  --------------------------------------------------------------
    EACH             9    SOLE DISPOSITIVE POWER:              0
 REPORTING
                  --------------------------------------------------------------
PERSON WITH         10    SHARED DISPOSITIVE POWER:            125,000

- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY               125,000
          EACH REPORTING PERSON:

- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN    [_]
          SHARES:*

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):              0.1%

- --------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON:*                  PN

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


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
<PAGE>
      This constitutes Amendment No. 2 to the Schedule 13D (the "Statement")
originally filed on July 3, 1991 by Samuel J. Heyman, GAF Corporation, G-I
Holdings Inc., G Industries Corp. and GAF Fiberglass Corporation (formerly known
as GAF Chemicals Corporation) relating to the common stock, par value $.01 per
share ("Common Stock"), of International Specialty Products Inc., a Delaware
corporation (the "Corporation").

ITEM 4.     PURPOSE OF THE TRANSACTION.

      As previously reported in the Statement and Amendment No. 1 thereto, ISP
Holdings Inc. ("ISP Holdings") acquired 80,500,000 shares of Common Stock (the
"Shares") pursuant to a distribution from G-I Holdings Inc., a former wholly
owned subsidiary of ISP Holdings ("G-I"), which had previously received the
shares as a distribution from G-I's wholly-owned subsidiary, G Industries Corp.
("G Industries"). G Industries had received these Shares as a distribution from
its wholly-owned subsidiary, GAF Fiberglass Corporation. All such distributions
occurred on January 1, 1997. As a result of additional transfers completed on
January 1, 1997 in connection with the distributions, G-I is no longer a
subsidiary of ISP Holdings.

      On March 30, 1998, ISP Holdings and the Corporation entered into an
Agreement and Plan of Merger (the "Merger Agreement") pursuant to which, subject
to the terms and conditions set forth therein, the Corporation will merge (the
"Merger") with and into ISP Holdings, with ISP Holdings as the surviving
corporation in the Merger (the "Surviving Corporation"). Prior to the Merger,
all of the assets and liabilities of the Corporation will be transferred to a
newly formed wholly owned subsidiary of the Corporation ("Newco"). As a result
of the Merger, (i) each outstanding share of Common Stock, other than Shares
owned by ISP Holdings, will be converted into one share of common stock ("New
ISP Common Stock") of the Surviving Corporation, (ii) each outstanding Share
owned by ISP Holdings will be cancelled and retired without payment of any
consideration therefor, (iii) Newco will become a direct wholly owned subsidiary
of the Surviving Corporation and (iv) the outstanding shares of common stock of
ISP Holdings will become shares of New ISP Common Stock representing
approximately 78% of the outstanding shares thereof.

      The Board of Directors of the Corporation approved the Merger based upon
the unanimous recommendation of the committee (the "Special Committee") of the
Board of Directors of the Corporation comprised of members thereof who are not
stockholders, directors or officers of, or consultants to, ISP Holdings or its
affiliates. Prior to approving of the Merger, J.P. Morgan & Co., Inc., the
financial advisor to the Board of Directors of the Corporation and the Special
Committee, delivered its opinion that the terms of the Merger are fair, from a
financial point of view, to the Corporation and its stockholders (other than ISP
Holdings).


                                     4
<PAGE>
      The consummation of the Merger is subject to certain conditions, including
approval of the Merger by the holders of (i) a majority of the common stock of
ISP Holdings and (ii) a majority of the Common Stock at a special meeting of
stockholders of the Corporation (the "Special Meeting"). ISP Holdings and the
Corporation will prepare a proxy statement/prospectus (the "Proxy Statement")
relating to the Merger and the shares of New ISP Common Stock to be issued
thereunder and distribute the Proxy Statement to the stockholders of the
Corporation prior to the Special Meeting. After the Merger, the Common Stock
will be delisted from trading on the New York Stock Exchange and the New ISP
Common Stock will be listed thereon for trading. A copy of each of the Merger
Agreement and the Press Release issued in connection with approval of the Merger
Agreement is filed as an Exhibit hereto and is incorporated herein by reference.

      Except as set forth above, the Reporting Persons have no present plans or
intentions which would result in or relate to any other transactions required to
be described in Item 4 of Schedule 13D.

ITEM 6.     CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH 
            RESPECT TO SECURITIES OF THE ISSUER.

      The information in Item 4 above is incorporated herein by reference.

ITEM 7.     MATERIAL TO BE FILED AS EXHIBITS.

      A.    Agreement and Plan of Merger, dated as of March 30, 1998, between 
ISP Holdings Inc. and International Specialty Products Inc.

      B. Press Release dated March 30, 1998.



                                     5
<PAGE>
                                    SIGNATURE


      After reasonable inquiry and to the best of the undersigned's knowledge
and belief, the undersigned certify that the information set forth in this
Statement is true, complete and correct.


Dated:  March 30, 1998                    /s/ Samuel J. Heyman
                                          ---------------------------
                                          Samuel J. Heyman


                                          ISP HOLDINGS INC.

                                          By: /s/ Samuel J. Heyman
                                              ----------------------------------
                                              Samuel J. Heyman
                                              Chairman of the Board of Directors
                                              and Chief Executive Officer


                                          HEYMAN JOINT VENTURE

                                          By: /s/ Samuel J. Heyman
                                              ----------------------------------
                                              Samuel J. Heyman
                                              General Partner





                                     6

<PAGE>
                                 EXHIBIT INDEX



Exhibit               Description
- -------               -----------

    A          Agreement and Plan of Merger, dated as of March 30, 1998, between
               ISP Holdings Inc. and International Specialty Products Inc.

    B          Press Release dated March 30, 1998.






                                                                EXECUTION COPY

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




                          AGREEMENT AND PLAN OF MERGER



                                 BY AND BETWEEN




                                ISP HOLDINGS INC.

                                       AND

                      INTERNATIONAL SPECIALTY PRODUCTS INC.



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

                           DATED as of MARCH 30, 1998

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





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


NYFS01...:\01\47201\0035\2377\AGR6187K.25L
<PAGE>
                          AGREEMENT AND PLAN OF MERGER

            AGREEMENT AND PLAN OF MERGER, dated as of March 30, 1998 (this
"Agreement"), by and between ISP Holdings Inc., a Delaware corporation ("ISP
Holdings"), and International Specialty Products Inc., a Delaware corporation
("ISP"). ISP Holdings and ISP are hereinafter sometimes collectively referred to
as the "Constituent Corporations."

            WHEREAS, ISP has authorized capital stock consisting of (i)
300,000,000 shares of common stock, par value $.01 per share ("ISP Common
Stock"), of which 96,057,477 shares are issued and outstanding as of March 20,
1998, and (ii) 20,000,000 shares of preferred stock, par value $.01 per share,
none of which is issued and outstanding as of the date hereof; and

            WHEREAS, ISP Holdings owns 80,500,000 shares of ISP Common Stock,
constituting approximately 84% of the outstanding shares of ISP Common Stock;
and

            WHEREAS, ISP Holdings has authorized capital stock consisting of (i)
3,000,000 shares of common stock, par value $.01 per share ("ISP Holdings Common
Stock"), of which 1,754,374 shares are issued and outstanding as of March 20,
1998 and (ii) 800,000 shares of cumulative redeemable convertible preferred
stock, par value $.01 per share, none of which is issued and outstanding as of
the date hereof, and has outstanding options to purchase 121,658 shares of ISP
Holdings Series A Redeemable Convertible Preferred Stock and 27,748 stock
appreciation rights outstanding based on the value of ISP Holdings Common Stock;
and

            WHEREAS, ISP intends to organize a new direct, wholly owned
subsidiary ("Newco"); and

            WHEREAS, the respective Boards of Directors of ISP Holdings and ISP
believe it is in the best interest of each of ISP Holdings and ISP and their
respective stockholders to consummate the merger of ISP with and into ISP
Holdings (the "Merger") pursuant to the applicable provisions of the General
Corporation Law of the State of Delaware (the "DGCL") and in accordance with the
terms and subject to the conditions of this Agreement, immediately following the
transfer by ISP (and at the request of ISP Holdings which



                                  1
<PAGE>
request is deemed to be made by the execution of this Agreement) of all of ISP's
assets to Newco and, in connection therewith, Newco's assumption of all of ISP's
liabilities, other than ISP's rights and obligations under this Agreement (the
"Transfer");

            WHEREAS, based upon the unanimous recommendation of the committee of
the Board of Directors of ISP comprised of members thereof who are not
stockholders, directors or officers of, or consultants to, ISP Holdings or its
affiliates (other than ISP and its subsidiaries (the "Committee")), pursuant to
the applicable provisions of the DGCL, the Board of Directors of ISP has
approved the Merger upon the terms and subject to the conditions set forth
herein and has recommended approval of this Agreement by the stockholders of
ISP.

            WHEREAS, the Board of Directors of ISP Holdings has unanimously
approved the Merger upon the terms and subject to the conditions set forth
herein and has recommended approval of this Agreement by its stockholders; and

            NOW, THEREFORE, the parties hereto agree as follows:


                                    ARTICLE I

                                   THE MERGER

            Section 1.01. Surviving Corporation. Upon the terms and subject to
the conditions hereof, on the Effective Date (as defined in Section 1.06
hereof), ISP shall be merged with and into ISP Holdings in accordance with the
applicable provisions of the DGCL and the separate corporate existence of ISP
shall thereupon cease, and ISP Holdings, as the surviving corporation in the
Merger (hereinafter referred to for periods on and after the Effective Date as
the "Surviving Corporation"), shall continue its corporate existence under the
laws of the State of Delaware under the name "International Specialty Products
Inc." The Merger shall have the effects set forth in the DGCL. Without limiting
the generality of the foregoing, and subject to the provisions of the DGCL and
the terms of the documents evidencing the Transfer, at the Effective Date, all
property, real, personal and mixed, and all debts due to any of the Constituent
Corporations on whatever account, or belonging to each of the Constituent
Corporations, shall be



                                  2
<PAGE>
vested in the Surviving Corporation; and all property, rights, privileges,
powers and franchises, and all and every other interest, shall be thereafter the
property of the Surviving Corporation as they were of the Constituent
Corporations, and the title to any real estate vested by deed or otherwise,
under the laws of the State of Delaware, in any of the Constituent Corporations,
shall not revert or be in any way impaired by reason of the DGCL; but all rights
of creditors and all liens upon any property of any of the Constituent
Corporations shall be preserved unimpaired, and, subject to the terms of the
documents evidencing the Transfer, all debts, liabilities and duties of the
respective Constituent Corporations shall thenceforth attach to the Surviving
Corporation, and may be enforced against it to the same extent as if said debts,
liabilities and duties had been incurred or contracted by it.

            Section 1.02. Certificate of Incorporation. The Certificate of
Incorporation of ISP Holdings, as in effect immediately prior to the Effective
Date, shall be the Certificate of Incorporation of the Surviving Corporation,
but shall be amended, as of the Effective Date, to be identical to the
Certificate of Incorporation of ISP as in effect immediately prior to the
Effective Date, until thereafter amended as provided by law.

            Section 1.03. By-Laws. The By-Laws of ISP, as in effect immediately
prior to the Effective Date, shall be the By-Laws of the Surviving Corporation
(with the corporate name thereon reflecting the name of the Surviving
Corporation) until thereafter amended as provided by law.

            Section 1.04. Directors. The directors of ISP immediately prior to
the Effective Date shall be the directors of the Surviving Corporation and shall
hold office from the Effective Date until their respective successors are duly
elected or appointed and qualify in the manner provided in the Certificate of
Incorporation and By-Laws of the Surviving Corporation, or as otherwise provided
by law.

            Section 1.05. Officers. The officers of ISP immediately prior to the
Effective Date shall be the officers of the Surviving Corporation and shall hold
office from the Effective Date until their respective successors are duly
elected or appointed and qualify in the manner provided in the Certificate of
Incorporation and By-Laws of the Surviving Corporation, or as otherwise provided
by law.




                                  3
<PAGE>
            Section 1.06. Effective Date. Subject to the terms and conditions
hereof, the effective date of the Merger (the "Effective Date") shall be the
date of filing of the Certificate of Merger with the Secretary of State of the
State of Delaware ("Certificate of Merger"), which shall be no later than the
second business day after satisfaction or waiver in accordance with the terms of
this Agreement of all conditions to the Merger specified in Articles VI, VII and
VIII hereto or such other day as shall be mutually agreeable to the parties
hereto.


                                   ARTICLE II

                        CONVERSION OF SHARES AND OPTIONS

            Section 2.01. Conversion of Shares. As of the Effective Date, by
virtue of the Merger and without any action on the part of the holders thereof:

            (a) each issued and outstanding share of ISP Common Stock (other
      than the shares owned of record by ISP Holdings) shall automatically be
      converted into one share of common stock, par value $.01 per share ("New
      ISP Common Stock"), of the Surviving Corporation;

            (b) each issued and outstanding share of ISP Common Stock owned of
      record by ISP Holdings immediately prior to the Effective Date shall be
      cancelled and retired without payment of any consideration therefor and
      shall cease to exist; and

            (c) each issued and outstanding share of ISP Holdings Common Stock
      shall automatically become a number of shares of New ISP Common Stock
      equal to the quotient obtained by dividing 53,833,333 by the number of
      outstanding shares of ISP Holdings Common Stock as of the Effective Date
      (such quotient being the "Conversion Ratio").

            Section 2.02. ISP Incentive Plan. As of the Effective Date, by
virtue of the Merger and without any action on the part of the holders thereof,
all outstanding stock options granted pursuant to ISP's 1991 Incentive Plan for
Key Employees and Directors (as amended, from time to time, the "ISP Incentive
Plan") shall be exercisable for shares of New ISP Common Stock at the same
prices and on the same terms and conditions as such options would have been
exercisable for ISP Common Stock immediately prior to the



                                  4
<PAGE>
Merger. As of the Effective Date, the ISP Incentive Plan shall continue as the
ISP Incentive Plan of the Surviving Corporation and shall be amended to provide
that all stock options issued thereunder that are outstanding as of the
Effective Date, or that may be granted thereunder after the Effective Date,
shall become immediately exercisable if a Change of Control (as defined in the
ISP Incentive Plan) shall occur and at any time following such Change of
Control, the Surviving Corporation (or any successor thereto) terminates without
cause the employment of the holder of such stock option, such holder's
employment is terminated as a result of his death or permanent disability or
such holder terminates such employment for "good reason." The holder thereof
shall be deemed to terminate his employment for "good reason" if he does so as
result of a change or changes in the terms of his employment that are materially
adverse to the holder, including with respect to his salary and bonus, level of
responsibility or geographic location of employment.

            Section 2.03. Treatment of ISP Holdings Options. (a) As of the
Effective Date, by virtue of the Merger and without any further action on the
part of the holders thereof (certain consents of which previously have been
obtained or will be obtained prior to the Effective Date), each outstanding
option (the "ISPH Preferred Stock Options") to purchase shares of ISP Holdings
Series A Cumulative Redeemable Convertible Preferred Stock that has not vested
prior to the Effective Date, will represent, subject to Section 2.03(f), the
right to receive cash from the Surviving Corporation on each vesting date (each,
a "Preferred Stock Vesting Date") prescribed by the applicable agreement
pursuant to which ISP Holdings granted such ISPH Preferred Stock Options (the
"Option Agreements"), in an amount equal to the excess of (i) the Option Price
with respect to the ISP Holdings Preferred Stock Options that vest on such
Preferred Stock Vesting Date, over (ii) the aggregate exercise price of such
vested ISPH Preferred Stock Options. The Option Price shall be equal to the (i)
the number of shares of New ISP Common Stock that would have been received in
the Merger in accordance with Section 2.01(c) if, immediately prior to the
Effective Date and subject to Section 2.03(e), the applicable ISPH Preferred
Stock Option had been exercised and the shares of preferred stock underlying the
ISPH Preferred Stock Options had been converted into shares of ISP Holdings
Common Stock multiplied by (ii) $16.125.




                                  5
<PAGE>
            (b) On the Effective Date, each holder of ISPH Preferred Stock
Options also will be granted (which grant shall be deemed to have been made as
of the date hereof), options under the ISP Incentive Plan (the "New Stock
Options") to purchase such number of shares of New ISP Common Stock as the
holder would have been entitled to receive in accordance with the conversion
rate described in Section 2.01(c), assuming such holder had exercised all of
such holder's ISPH Preferred Stock Options immediately prior to Effective Date
and converted such shares of preferred stock into ISP Holdings Common Stock and
subject to Section 2.03(e). The New Stock Options will have an exercise price
equal to $16.125, will vest, subject to the terms of the ISP Incentive Plan, in
accordance with the vesting schedule of such holder's Option Agreement and will
have such other terms as are prescribed by the ISP Incentive Plan and the
agreement pursuant to which the New Stock Options will be issued to such holder.
The term of expiration of the New Stock Options will be the same as the term of
expiration of the ISPH Preferred Stock Options. ISP agrees to take all action
necessary prior to the Effective Date, including presenting the matter for the
vote of the ISP stockholders as contemplated in Section 5.5, to ensure that
there is authorized under the ISP Incentive Plan a sufficient number of shares
of New ISP Common Stock to be issued upon the exercise of the New Stock Options.

            (c) As of the Effective Date, with respect to stock appreciation
rights ("SARs") granted by ISP Holdings based upon the value of ISP Holdings
Common Stock that are vested as of the Effective Date and, with respect to SARs
that are not vested prior to the Effective Date, on each subsequent vesting date
(each a "SAR Vesting Date") prescribed by the agreement pursuant to which ISP
Holdings granted such holder SARs (the "SAR Agreements"), such SARs will
represent, subject to Section 2.03(f), the right to receive from the Surviving
Corporation cash in an amount equal to (i) the SAR Price with respect to SARs
that vest on such SAR Vesting Date, over (ii) the aggregate Appreciation Value
(as defined in the applicable SAR Agreement and as calculated as set forth in
Section 2.03(e)) of such SARs. The SAR Price shall be equal to the (i) the
number of shares of New ISP Common Stock that would have been received in the
Merger in accordance with Section 2.01(c) if, subject to Section 2.03(e), the
shares of ISP Holdings Common Stock underlying the SAR had been outstanding at
the Effective Date multiplied by (ii) $16.125.




                                  6
<PAGE>
            (d) On the Effective Date, each holder of an SAR also will be
granted (which grant shall be made as of the date hereof) options under the ISP
Incentive Plan (the "New SAR Options") to purchase such number of shares of New
ISP Common Stock as is equal to the number of shares of ISP Holdings Common
Stock underlying the SAR multiplied by the conversion rate set forth in Section
2.01(c) above. The New SAR options will have an exercise price equal to $16.125,
will vest, subject to the terms of the ISP Incentive Plan, in accordance with
the existing vesting schedule of such holder's SAR Agreement and will have such
other terms as are prescribed by the ISP Incentive Plan and the agreement
pursuant to which the New SAR Options will be issued to such holder. The term of
expiration of the New SAR Options will be the same as the term of expiration of
the SARs. ISP agrees to take all action necessary prior to the Effective Date,
including presenting the matter for the vote of the ISP stockholders as
contemplated in Section 5.5, to ensure that there is authorized under the ISP
Incentive Plan a sufficient number of shares of New ISP Common Stock to be
issued upon the exercise of the New SAR Options.

            (e) With respect to calculating (i) the number of shares of ISP
Holdings Common Stock that holders of ISPH Preferred Stock Options would have
received had they exercised their options and converted the underlying preferred
stock immediately prior to the Effective Date and (ii) the Appreciation Value of
the shares of ISP Holdings Common Stock underlying the SARs, (A) for purposes of
Section 2.03(a) and Section 2.03(c), it is assumed that each portion of the ISPH
Preferred Stock Options would have been exercised and the underlying preferred
stock would have been converted on, and that each portion of the SARs would have
been held until, the date such portion would have initially become vested (or,
if later, the Effective Date) and (B) for purposes of Section 2.03(b), it is
assumed that the ISPH Preferred Stock Options would have been exercised and the
underlying preferred stock would have been converted on the date that all of the
options (each grant to be treated separately) held by a holder would have become
vested, so that, in each case, the interest factor under the terms of the Option
Agreements and the SAR Agreements in respect of the shares of ISP Holdings
Common Stock underlying the preferred stock and SARs would be deemed to continue
to accrue until such time.

            (f) The right of each holder to receive cash in accordance with
Sections 2.03(a) and (c) shall be subject to the terms of the applicable Option
Agreements and SAR



                                  7
<PAGE>
Agreements regarding continued employment with ISP Holdings or its affiliates.
In addition, the right of each holder to receive cash in accordance with Section
2.03(a) and (c), and the right of each holder to exercise New Stock Options and
New SAR Options, shall become immediately exercisable if a Change of Control (as
defined in the ISP Incentive Plan) shall occur and at any time following such
Change of Control, the Surviving Corporation (or any successor thereto)
terminates without cause the employment of the holder of such ISPH Preferred
Stock Option or SAR, such holder's employment is terminated as a result of his
death or permanent disability or such holder terminates such employment for
"good reason." The holder shall be deemed to terminate his employment for "good
reason" if he does so as a result of a change or changes in the terms of his
employment that are materially adverse to the holder, including with respect to
his salary and bonus, level of responsibility or geographic location of
employment.

            Section 2.04. Stock Certificates. (a) On the Effective Date, each
issued and outstanding share of ISP Common Stock (other than the shares owned of
record by ISP Holdings, which will be cancelled) shall automatically, by virtue
of the Merger and without any action on the part of the holder thereof, become
one share of New ISP Common Stock, and the certificates which represent such
shares of ISP Common Stock will automatically represent the shares of New ISP
Common Stock into which such shares of ISP Common Stock shall have been
converted in the Merger. After the Effective Date, as presently outstanding
certificates representing shares of ISP Common Stock (other than the shares
owned of record by ISP Holdings) are presented for transfer, new stock
certificates bearing the name of the Surviving Corporation and representing the
appropriate number of shares of New ISP Common Stock shall be issued.

            (b) On the Effective Date, each issued and outstanding share of ISP
Holdings Common Stock shall automatically, by virtue of the Merger and without
any action on the part of the holder thereof, become a number of shares of New
ISP Common Stock equal to the Conversion Ratio, and the certificates which
represent such shares of ISP Holdings Common Stock will automatically represent
the shares of New ISP Common Stock into which such shares of ISP Holdings Common
Stock shall have been become in the Merger. After the Effective Date, as
presently outstanding certificates representing shares of ISP Holdings Common
Stock are presented for transfer, new stock certificates bearing the name of the
Surviving Corporation and



                                  8
<PAGE>
representing the appropriate number of shares of New ISP Common Stock shall be
issued.


                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES
                                     OF ISP

            ISP represents and warrants to ISP Holdings as follows:

            Section 3.01. Organization. ISP 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 own, lease and operate
its properties and to carry on its business as now being conducted.

            Section 3.02. Capitalization. The capitalization of ISP appearing in
the recitals to this Agreement is true and correct as of the date hereof. All of
the issued and outstanding shares of ISP Common Stock are validly issued, fully
paid and non-assessable and free from preemptive rights.

            Section 3.03. Authority Relative to this Agreement. ISP has the
requisite corporate power to enter into this Agreement and to carry out its
obligations hereunder. The execution and delivery of this Agreement and the
consummation of the transactions contemplated hereby have been duly authorized
by the Board of Directors of ISP and, except for the approval of this Agreement
in accordance with the DGCL by the stockholders of ISP, no other corporate
proceeding on the part of ISP is necessary to authorize this Agreement and the
transactions contemplated hereby. This Agreement has been duly executed and
delivered by ISP and constitutes a valid and binding obligation of ISP
enforceable against it in accordance with its terms, subject to (i) approval in
accordance with the DGCL of the stockholders of ISP and (ii) applicable
bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and
similar laws affecting creditors' rights and remedies generally and subject, as
to enforceability, to general principles of equity, including principles of
commercial reasonableness, good faith and fair dealing (regardless of whether
enforcement is sought in a proceeding at law or in equity).




                                  9
<PAGE>
            Section 3.04. Consents and Approvals; No Violation. Except for
applicable requirements of the Securities Act of 1933, as amended (the
"Securities Act"), and the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), filings with various state blue sky authorities and filing and
recordation of appropriate merger documents as required by the DGCL and the
corporate law of the other states in which the Constituent Corporations are
qualified to do business, no filing with or notice to, and no permit,
authorization, consent or approval of, any public body or authority, the absence
of which could be reasonably expected to, either individually or in the
aggregate, have a material adverse effect on the business, operations or
financial condition of ISP and its subsidiaries, taken as a whole, is necessary
for the execution and delivery by ISP of this Agreement or the consummation by
ISP of the transactions contemplated by this Agreement. Except as set forth in
Schedule 3.04, neither the execution, delivery and performance by ISP of this
Agreement nor the consummation by ISP of the transactions contemplated hereby
nor compliance by ISP with any of the provisions hereof will (i) conflict with
or result in any breach of any provision of the Certificate of Incorporation or
By-Laws of ISP, (ii) 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 agreement or other instrument or obligation to which ISP is a party or by
which ISP or any of its properties or assets may be bound or (iii) violate any
order, writ, injunction, decree, statute, rule or regulation applicable to ISP
or any of its properties or assets, except with respect to clauses (ii) and
(iii), such violations, breaches or defaults which, either individually or in
the aggregate, could not be reasonably expected to have a material adverse
effect on the business, operations or financial condition of ISP and its
subsidiaries, taken as a whole.

            Section 3.05. Proxy Statement/Prospectus. None of the information
supplied or to be supplied by ISP for inclusion in the proxy
statement/prospectus (the "Proxy Statement") to be mailed to the stockholders of
ISP in connection with the meeting of stockholders of ISP convened in accordance
with Section 5.05 or in the Registration Statement (as defined in Section 5.04)
will, (a) in the case of the Registration Statement, at the time it is filed
with the Securities and Exchange Commission (the "SEC") or any other regulatory
authority, at the time it becomes effective



                                  10
<PAGE>
and at the Effective Date, 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, or (b) in the case of the Proxy Statement, at the
time it is filed with the SEC or any other regulatory authority, at the time of
the mailing of the Proxy Statement or any amendment or supplement thereto, at
the time of the meetings of the stockholders to which the Proxy Statement
relates and at the Effective Date, 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. If at any time prior to the Effective
Date any event with respect to ISP, its officers and directors or any of its
subsidiaries should occur which is required to be described in an amendment of,
or a supplement to, the Proxy Statement or the Registration Statement, such
event shall be so described, and such amendment or supplement shall be promptly
filed with the SEC and, to the extent required by law, disseminated to the
stockholders of ISP. The Proxy Statement and any other SEC filing in connection
with the Merger will comply (with respect to ISP) in all material respects, as
to form, with the applicable requirements of each of the Securities Act and the
Exchange Act, and the respective rules and regulations thereunder.

            Section 3.06. Fairness Opinion. Each of the Board of Directors and
the Committee has received an opinion of J.P. Morgan & Co., Inc. ("J.P.
Morgan"), financial advisor to ISP, that the terms of the Merger are fair, from
a financial point of view, to ISP and its stockholders (other than ISP Holdings)
(the "Unaffiliated Stockholders").


                                   ARTICLE IV

             REPRESENTATIONS AND WARRANTIES OF ISP HOLDINGS

            ISP Holdings represents and warrants to ISP as follows:

            Section 4.01. Organization. Each of ISP Holdings and Belleville
Realty Corp. ("Belleville") 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 own, lease and operate its



                                  11
<PAGE>
properties and to carry on its business as now being conducted.

            Section 4.02. Capitalization. The capitalization of ISP Holdings
appearing in the recitals of this Agreement is true and correct as of the date
hereof. All the issued and outstanding shares of ISP Holdings Common Stock are
validly issued, fully paid and non-assessable and free from preemptive rights.
Except for the stock options and stock appreciation rights described in the
recitals to this Agreement and in the agreements listed on Schedule 4.02 (true
and complete copies of which have been delivered to the Committee), (i) there
are no subscriptions, options, warrants, calls, rights, contracts, commitments,
understandings, restrictions or arrangements relating to the issuance, sale,
transfer or voting of any equity security of ISP Holdings or Belleville,
including any rights of conversion or exchange under any outstanding securities
or other instruments and (ii) there are not any outstanding obligations of ISP
Holdings to repurchase, redeem or otherwise acquire any share of capital stock
of ISP Holdings or make any material investment (in the form of a loan, capital
contribution or otherwise) in any person.

            Section 4.03. Subsidiaries. Except for its ownership of capital
stock of Belleville and ISP and investments in securities in accordance with
customary trading activities, ISP Holdings does not own any capital stock or
other equity securities of any corporation, has no direct or indirect equity or
ownership interest in, by way of stock ownership or otherwise, any corporation,
partnership, joint venture, association or business enterprise and is not
contemplating acquiring any such interest. All of the outstanding shares of
capital stock of Belleville have been validly issued and are fully paid and
nonassessable, and, except as set forth on Schedule 4.03, are owned by ISP
Holdings free and clear of all pledges, claims, liens, charges, encumbrances and
security interests of any kind or nature whatsoever.

            Section 4.04. Authority Relative to this Agreement. ISP Holdings has
the requisite corporate power to enter into this Agreement and to carry out its
obligations hereunder. The execution and delivery of this Agreement and the
consummation of the transactions contemplated hereby have been duly authorized
by the Board of Directors of ISP Holdings and, except for the approval of this
Agreement in accordance with the DGCL by the stockholders of ISP Holdings, no
other corporate proceeding on the part of ISP



                                  12
<PAGE>
Holdings is necessary to authorize this Agreement and the transactions
contemplated hereby. This Agreement has been duly executed and delivered by ISP
Holdings and constitutes a valid and binding obligation of ISP Holdings
enforceable against it in accordance with its terms, subject to (i) approval in
accordance with the DGCL of the stockholders of ISP Holdings and (ii) applicable
bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and
similar laws affecting creditors' rights and remedies generally and subject, as
to enforceability, to general principles of equity, including principles of
commercial reasonableness, good faith and fair dealing (regardless of whether
enforcement is sought in a proceeding at law or in equity).

            Section 4.05. Consents and Approvals; No Violation. Except for
applicable requirements of the Securities Act and the Exchange Act, filings with
various state blue sky authorities and filing and recordation of appropriate
merger documents as required by the DGCL and the corporate law of the other
states in which the Constituent Corporations are qualified to do business, no
filing with or notice to, and no permit, authorization, consent or approval of,
any public body or authority or any other person, the absence of which could
reasonably be expected to, either individually or in the aggregate, have a
material adverse effect on the business, operations or financial condition of
ISP Holdings and Belleville, taken as a whole (a "Material Adverse Effect"), is
necessary for the execution and delivery by ISP Holdings of this Agreement or
the consummation by ISP Holdings of the transactions contemplated by this
Agreement. Except as set forth in Schedule 4.05, neither the execution, delivery
and performance by ISP Holdings of this Agreement nor the consummation by ISP
Holdings of the transactions contemplated hereby nor compliance by ISP Holdings
with any of the provisions hereof will (i) conflict with or result in any breach
of any provision of the Certificate of Incorporation or By-Laws of ISP Holdings,
(ii) 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
agreement or other instrument or obligation to which ISP Holdings is a party or
by which ISP Holdings or any of its properties or assets may be bound or (iii)
violate any order, writ, injunction, decree, statute, rule or regulation
applicable to ISP Holdings or any of its properties or assets, except with
respect to clauses (ii)



                                  13
<PAGE>
and (iii), such violations, breaches or defaults which, either individually or
in the aggregate, would not have a Material Adverse Effect.

            Section 4.06. Proxy Statement. None of the information supplied or
to be supplied by ISP Holdings for inclusion or incorporation by reference in
the Proxy Statement or the Registration Statement will, (a) in the case of the
Registration Statement, at the time it is filed with the SEC or any other
regulatory authority, at the time it becomes effective and at the Effective
Date, 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, or (b) in the case of the Proxy Statement, at the time it is filed
with the SEC or any other regulatory authority, at the time of the mailing of
the Proxy Statement or any amendment or supplement thereto, at the time of the
meetings of the stockholders to which the Proxy Statement relates and at the
Effective Date, 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. If at any time prior to the Effective Date any event with
respect to ISP Holdings, its officers and directors or any of its subsidiaries
(other than ISP and its subsidiaries) should occur which is required to be
described in an amendment of, or a supplement to, the Proxy Statement or the
Registration Statement, such event shall be so described, and such amendment or
supplement shall be promptly filed with the SEC and, to the extent required by
law, disseminated to the stockholders of ISP. The Proxy Statement and any other
SEC filing will comply (with respect to ISP Holdings) in all material respects,
as to form, with the applicable requirements of each of the Exchange Act and the
Securities Act and the respective rules and regulations thereunder.

            Section 4.07. SEC Documents. ISP Holdings has filed all forms,
reports and documents required to be filed by it with the Securities and
Exchange Commission ("SEC") since December 24, 1996 through the date hereof
(collectively, the "Company Reports"). As of their respective dates, the Company
Reports (i) complied as to form in all material respects with the applicable
requirements of the Securities Act of 1933, as amended (the "Securities Act"),
the Securities Exchange Act of 1934, as amended (the "Exchange Act") and the
rules and regulations



                                  14
<PAGE>
thereunder and (ii) did not contain any untrue statement of a material fact or
omit to state a material fact required to be stated therein or necessary to make
the statements made therein, in light of the circumstances under which they were
made, not misleading. The consolidated financial statements of ISP Holdings
included in or incorporated by reference into the Company Reports (including the
related notes and schedules) fairly present the consolidated financial position
of ISP Holdings as of its date, and each of the consolidated statements of
income, retained earnings and cash flows of ISP Holdings included in or
incorporated by reference into the Company Reports (including any related notes
and schedules) fairly presents the results of operations, retained earnings or
cash flows, as the case may be, of ISP Holdings for the periods set forth
therein, in each case in accordance with generally accepted accounting
principles consistently applied during the periods involved, except as may be
noted therein. The unaudited, unconsolidated balance sheet of ISP Holdings as of
February 22, 1998 attached hereto as Schedule 4.07 (the "Unconsolidated Balance
Sheet") fairly presents the unconsolidated financial position of ISP Holdings as
of such date in accordance with generally accepted accounting principles
consistently applied as of the date thereof, except as may be noted therein.

            Section 4.08. Compliance with Laws. Each of ISP Holdings and
Belleville, and to the best knowledge of ISP Holdings, all of their respective
officers, directors, employees, consultants and agents have complied and are in
compliance in all material respects with all applicable statutes, regulations,
rules, orders, ordinances, judgments, decrees, permits, franchises, licenses and
other laws of the United States of America, all state, local and foreign
governments and other governmental bodies and authorities, and agencies of any
of the foregoing ("Governmental Authority") to which it is subject, except to
the extent noncompliance would not have a Material Adverse Effect. Neither ISP
Holdings nor Belleville has received any notice or other communication to the
effect that, or otherwise been advised or become aware that, it or any activity
conducted or monitored by it is not so in compliance with any of such statutes,
regulations and orders, ordinances, other laws or undertakings, and ISP Holdings
has no reason to anticipate that any presently existing circumstances are likely
to result in violations of any such regulations which would have a Material
Adverse Effect.




                                  15
<PAGE>
            Section 4.09. Litigation and Claims. Neither ISP Holdings nor
Belleville is subject to any continuing order of, or written agreement or
memorandum of understanding with, or continuing material investigation by any
Governmental Authority or any judgment, order, writ, injunction, decree, or
award of any Governmental Authority or any court or arbitrator, and there is no
claim, action, suit, litigation, proceeding, arbitration, investigation, or
controversy affecting ISP Holdings or Belleville or, to the knowledge of ISP
Holdings, threatened, nor is there any valid basis known to ISP Holdings for any
such claim, action, suit, litigation, proceeding, arbitration, investigation or
controversy except for matters which would not have a Material Adverse Effect.

            Section 4.10.  Taxes and Tax Returns.
(a)  Definitions:

                  "Code" means the Internal Revenue Code of 1986, as amended.
All citations to provisions of the Code, or to the Treasury Regulations
promulgated thereunder, shall include any amendments thereto and any substitute
or successor provisions thereto.

                  "Taxes" means all taxes, charges, fees, levies or other
assessments, including income, gross receipts, employment, excise, withholding,
property, sales, use, transfer, license, payroll and franchise taxes, including
under Treasury Regulation ss. 1.1502-6 or any similar provision under state or
local law, pursuant to any agreement to share taxes, or as a transferee of
assets, together with any interest and any penalties, additions to tax or
additional amounts with respect thereto, imposed by the United States, or any
state, local or foreign government or subdivision or agency thereof.

                  "Taxable Period" means any taxable year or any other period
that is treated as a taxable year (or other period, or portion thereof, in the
case of a Tax imposed with respect to such period or portion thereof, e.g., a
quarter) with respect to which any Tax may be imposed under any applicable
statute, rule, or regulation.

                  "Tax Return" shall mean any report, return, election, notice
or other information required to be supplied to a taxing authority in connection
with Taxes.

            (b) All material Tax Returns required to be filed by or with respect
to ISP Holdings or Belleville for all



                                  16
<PAGE>
Taxable Periods ending on or before the date hereof or the Effective Date have
been or will be timely filed. All such Tax Returns (i) were (or, to the extent
not yet filed, will be) prepared in the manner required by applicable law, (ii)
are (or, to the extent not yet filed, will be) true, correct, and complete in
all material respects, and (iii) except to the extent that a proper reserve for
Taxes (without regard to deferred Taxes) has been reflected on the
Unconsolidated Balance Sheet in accordance with GAAP, reflect (or, to the extent
not yet filed, will reflect) the liability for Taxes of ISP Holdings and
Belleville. No adjustment to any such Tax Return has been proposed or threatened
formally or informally by any Taxing authority.

            (c) ISP Holdings and Belleville have made (or there has been made on
its behalf) all required current estimated Tax payments sufficient to avoid any
material underpayment penalties.

            (d) ISP Holdings and Belleville have (i) timely paid or caused to be
paid or will cause to be timely paid all Taxes that are or were due on or prior
to the date hereof or the Effective Date, whether or not such Taxes are or were
shown (or required to be shown) on a Tax Return, except to the extent that a
proper reserve for Taxes (without regard to deferred Taxes) has been reflected
on the Unconsolidated Balance Sheet, in accordance with GAAP, and (ii) provided
a sufficient reserve for the payment of all Taxes not yet due and payable on the
Unconsolidated Balance Sheet, except, in the case of clauses (i) or (ii), for
Taxes incurred in the ordinary course of business after the date of the
Unconsolidated Balance Sheet which Taxes are not material. There are no Taxes
that would be due with respect to ISP Holdings or Belleville if asserted either
by a Taxing authority or by a party to one of the tax sharing agreements
referred to in Section 4.10(g), except with respect to which ISP Holdings is
maintaining adequate reserves (without regard to deferred Taxes) on such
Unconsolidated Balance Sheet.

            (e) No material claim has ever been made in writing by any Taxing
authority with respect to ISP Holdings in a jurisdiction where ISP Holdings or
Belleville do not file reports or returns that ISP Holdings or Belleville is or
may be subject to Tax by that jurisdiction. Except for liens for real and
personal property Taxes that are not yet due and payable, there are no liens for
any Tax upon any asset of ISP Holdings.




                                  17
<PAGE>
            (f) Neither ISP Holdings nor Belleville has agreed nor is required
to include in income or make any material adjustment under either Section 481(a)
or Section 482 of the Code (or an analogous provision of state, local or foreign
law) by reason of a change in accounting or otherwise. Neither ISP Holdings nor
Belleville has disposed of any material property in a transaction being
accounted for under the installment method pursuant to Section 453 of the Code.

            (g) Neither ISP Holdings nor Belleville is a party to any agreement
(other than the Tax Sharing Agreement, dated October 18, 1996, among GAF
Corporation ("GAF"), ISP Holdings and other affiliates of GAF, the
Indemnification Agreement, dated October 18, 1996, among GAF, ISP Holdings and
other affiliates of GAF and the Tax Sharing Agreement, dated January 1, 1997,
between ISP Holdings and ISP) to share Taxes with respect to any Taxable Period.

            (h) There is no contract, agreement, plan or arrangement covering
any person that, individually or collectively, could, as a result of the Merger,
give rise to the payment of any amount that would not be deductible by ISP
Holdings or Belleville by reason of Section 280G of the Code.

            Section 4.11. Environmental, Health and Safety ("EHS") Matters. (a)
Definitions:

            "Contaminant" means any pollutant, hazardous substance, radioactive
substance, toxic substance, hazardous waste, medical waste, radioactive waste,
special waste, petroleum or petroleum-derived substance or waste product,
asbestos, PCBs, or any hazardous or toxic constituent thereof and includes any
waste product, or other substance defined in or regulated under EHS Requirements
of Law.

            "EHS Liabilities" means all claims, judgments, damages (including
punitive damages), losses, penalties, fines, interest, fees, liabilities
(including strict liability), encumbrances, liens, costs, and expenses of
investigation and defense of any claim, whether or not such claim is ultimately
defeated, and of any good faith settlement of judgment, of whatever kind or
nature, contingent or otherwise, matured or unmatured, foreseeable or
unforeseeable, including reasonable attorneys' fees and disbursements and
consultants' fees, any of which are incurred at any time as a result of the
existence of Contaminants at any



                                  18
<PAGE>
location or noncompliance with EHS Requirements of Law, including:

                (i) Damages for personal injury or threatened personal injury
(including sickness, disease or death), or injury or threatened injury to
property or natural resources, foreseeable or unforeseeable, including the cost
of demolition and rebuilding of any improvements on real property;

               (ii) Reasonable fees incurred for the services of attorneys,
consultants, contractors, doctors, experts, laboratories and all other
reasonable costs incurred in connection with any damages as described in
subparagraph (i) of this definition, and the investigation or remediation of
Contaminants or the suspected presence of Contaminants or the violation or
threatened violation of EHS Requirements of Law including the preparation of any
feasibility studies or reports or the performance of any investigations,
cleanup, treatment, remediation, removal, response, abatement, containment,
closure, storage, disposal, transport, restoration or monitoring work required
by any federal, state, local or foreign governmental agency or political
subdivision, or otherwise expended in connection with such conditions, and
including any reasonable attorneys' fees, costs and expenses incurred in
enforcing this Agreement or collecting any sums due hereunder; and

              (iii) Liability to any third person or Governmental Authority to
indemnify such person or Governmental Authority for costs expended in connection
with the items referenced in subparagraphs (i) and (ii) of this definition.

            "EHS Requirements of Law" means all federal, state, local and
foreign laws, statutes, codes, ordinances, rules, regulations, directives,
binding policies, EHS permits, or orders relating to or addressing the
environment, health or safety, including any law, statute, code, ordinance,
rule, regulation, directive, binding policy, EHS permit or order relating to (x)
the use, handling or disposal of any Contaminant or (y) workplace or worker
safety and health, as such requirements are promulgated by the specifically
authorized Governmental Authority responsible for administering such
requirements.

            (b) Neither ISP Holdings nor Belleville is individually subject to
EHS Liabilities which alone or aggregated with those of the other entity, would
have a Material Adverse Effect.



                                  19
<PAGE>
            Section 4.12. Employees and Employee Plans. Except as referred to in
Section 4.02, neither ISP Holdings nor Belleville has any liability or
obligation, contingent or otherwise, to or in respect of any of their current or
former employees or independent contractors. Without limiting the generality of
the foregoing, neither ISP Holdings nor Belleville has any liability or
obligation, contingent or otherwise, to or in respect of any "employee benefit
plan" (within the meaning of Section 3(3) of ERISA), which is now or has at any
time in the past been maintained, sponsored or contributed by ISP Holdings or
Belleville or any entity that is treated as a single employer with any of the
foregoing (other than ISP and its subsidiaries) for purposes of Section 414 of
the Code other than those arising under plans maintained by ISP or its
subsidiaries.

            Section 4.13. No Brokers. No broker, finder or investment banker is
entitled to any brokerage, finder's or other fee or commission in connection
with the Merger based upon arrangements made by or on behalf of ISP Holdings or
Belleville.

            Section 4.14. Absence of Certain Changes. Since December 24, 1996,
except as disclosed in the Company Reports, ISP Holdings has conducted its
business only in the ordinary course of such business, and there has not been
any change in or effect on the business, earnings, assets, liabilities,
financial or other condition or results of operations of ISP Holdings that has
had or would have a Material Adverse Effect and no fact or condition exists or
is reasonably contemplated or threatened which ISP Holdings believes has a
reasonable probability of resulting in any change in or effect on the business,
earnings, assets, liabilities, financial or other condition, results of
operations of ISP Holdings or Belleville.

            Section 4.15. Absence of Undisclosed Liabilities. Neither ISP
Holdings nor Belleville has any liabilities or obligations of any nature,
whether or not accrued, contingent or otherwise, whether due or to become due,
except (a) liabilities or obligations reflected or reserved against in the
Company Reports of ISP Holdings and (b) liabilities or obligations which would
not have a Material Adverse Effect.

            Section 4.16. Title to Properties and Related Matters. Except as set
forth on Schedule 4.16, neither ISP Holdings nor Belleville owns or leases any
real property.


                                  20
<PAGE>
            All representations and warranties contained herein which refer to
ISP Holdings shall be deemed to relate to ISP Holdings alone, and not to ISP
Holdings consolidated with its subsidiaries.


                                    ARTICLE V

                                    COVENANTS

            Section 5.01. Capitalization. Prior to the Effective Date, unless
the other party to this Agreement shall agree (provided, in the case of ISP,
that the Committee shall have concurred in the manner set forth in Section
11.10) in writing and except as otherwise expressly permitted or contemplated by
this Agreement:

            (a) neither ISP Holdings nor ISP shall split, combine or reclassify
the outstanding shares of ISP Holdings Common Stock or ISP Common Stock,
respectively, or declare, set aside or pay any dividend payable in cash, stock
or property or make any distribution with respect to the outstanding shares of
ISP Holdings Common Stock or ISP Common Stock, respectively; or, except for the
repurchase of (i) ISP Holdings Common Stock in accordance with the agreements
listed on Schedule 4.02 and (ii) up to 105,000 shares of ISP Common Stock
pursuant to ISP's existing stock buy-back program, redeem, purchase or otherwise
acquire (or agree to redeem, purchase or otherwise acquire), directly or
indirectly, any shares of ISP Holdings Common Stock or ISP Common Stock,
respectively; and

            (b) neither ISP Holdings nor ISP, or any of their respective
subsidiaries shall issue or agree to issue any additional shares of ISP Holdings
Common Stock or ISP Common Stock, respectively, or options, warrants or rights
of any kind to acquire any shares of ISP Holdings Common Stock or ISP Common
Stock, respectively, other than, in the case of ISP, (i) ISP Stock Options
issuable pursuant to the ISP Incentive Plan or (ii) shares issuable pursuant to
the exercise of ISP Stock Options outstanding on the date hereof or hereafter
granted pursuant to the ISP Incentive Plan.

            Section 5.02. Certain Actions Pending Merger. Prior to the Effective
Date, neither ISP Holdings nor Belleville shall (i) grant any general increase
in compensation to its employees as a class, or to its officers or directors,
except in accordance with past practice or as required by law, or increases
which are not material, or the



                                  21
<PAGE>
payment of year-end bonuses in accordance with past practice, (ii) effect any
change in retirement benefits to any class of employees or officers (unless any
such change shall be required by applicable law) which would increase its
retirement benefit liabilities, (iii) adopt, enter into, or amend or modify any
ISP Holdings benefit plan, (iv) enter into or amend any employment, severance or
similar agreements or arrangements with any directors or officers, (v) incur any
liabilities or obligations except in accordance with past practices, which
practices shall include borrowings from ISP and its subsidiaries, or (vi) engage
in any transaction other than (A) investments conducted in accordance with past
practices or (B) transactions with ISP and its subsidiaries conducted in
accordance with past practices.

            Section 5.03. Conduct of Business by ISP Holdings and ISP Pending
the Merger. During the period from the date of this Agreement and continuing
until the Effective Date, ISP Holdings and ISP agree that (except as expressly
contemplated or permitted by this Agreement) neither ISP Holdings nor ISP shall
(a) knowingly take any action that would, or would be reasonably likely to,
result in any of the representations and warranties of ISP Holdings or ISP set
forth in this Agreement not being true in all material respects or in any of the
conditions to the Merger set forth in Articles VI, VII and VIII not being
satisfied or (b) take any action or omit to take any action which would be
reasonably likely to prevent either (i) the Transfer from constituting an
exchange governed by Section 351(a) of the Code or (ii) the Merger from
constituting a reorganization within the meaning of Section 368(a) of the Code.

            Section 5.04. Registration Statement. ISP Holdings shall promptly
prepare and file with the SEC a registration statement (the "Registration
Statement") with respect to the shares of New ISP Common Stock to be issued to
the stockholders of ISP in the Merger and shall use all reasonable efforts to
have the Registration Statement declared effective by the SEC as promptly as
practicable. ISP Holdings also shall use its best efforts to take any reasonable
action required to be taken under state blue sky or securities laws
(collectively, "Blue Sky Laws") in connection with the issuance of shares of New
ISP Common Stock pursuant to the Merger, and ISP Holdings and ISP shall each
furnish all information concerning ISP Holdings and ISP and the holders of
shares of ISP Common Stock, as the case may be, and shall take such other action
as the other may be reasonably requested in connection with any such action.



                                  22
<PAGE>
            Section 5.05. ISP Stockholder Approval. (a) ISP shall take, subject
to the provisions of subsection (c) hereof, all steps necessary to call, give
notice of, convene and hold a special meeting of its stockholders (the "ISP
Stockholders Meeting"), and shall prepare, file with the SEC and, when and if
the Registration Statement is declared effective, mail to ISP's Stockholders the
Proxy Statement, for the purpose of adopting and approving this Agreement and
the transactions contemplated hereby (including adopting and approving an
amendment to the ISP Incentive Plan to increase the authorized number of shares
of New ISP Common Stock available for issuance thereunder as contemplated by
Section 2.03) and for such other purposes as may be necessary or desirable.

            (b) ISP Holdings shall vote, or cause to be voted, all shares of ISP
Common Stock beneficially owned by ISP Holdings in favor of this Agreement and
the transactions contemplated hereby.

            (c) The Committee has unanimously recommended to the Board of
Directors of ISP that the Merger is fair to and in the best interests of the
Unaffiliated Stockholders. Based upon the recommendation of the Committee, the
Board of Directors of ISP has determined that the Merger is advisable and in the
best interests of the Unaffiliated Stockholders and shall, subject to their
fiduciary duties under Delaware law, recommend to its stockholders the adoption
and approval of this Agreement and the transactions contemplated hereby and
shall, subject to their fiduciary duties under Delaware law, use its reasonable
efforts to obtain the necessary approvals by its stockholders of the Merger and
the transactions contemplated hereby.

            Section 5.06. ISP Holdings Stockholder Approval. ISP Holdings shall
take all steps necessary to call, give notice of, convene and hold a special
meeting, or in lieu thereof, obtain the written consent, of its stockholders
(the "ISP Holdings Stockholders Meeting"), and shall mail to its stockholders
prior to the ISP Holdings Stockholder Meeting information regarding the Merger
for the purpose of adopting and approving this Agreement and the transactions
contemplated hereby and for such other purposes as may be necessary or desirable
in connection therewith.

            Section 5.07. Reasonable Efforts. Subject to the terms and
conditions herein provided, each of the parties hereto agrees to use its
reasonable efforts to take, or cause to be taken, all action, and to do, or
cause to be


                                  23
<PAGE>
done, all things necessary, proper or advisable under applicable laws and
regulations to consummate and make effective the transactions contemplated by
this Agreement. In case at any time after the Effective Date any further action
is necessary or desirable to carry out the purposes of this Agreement, the
proper officers and directors of each corporation which is a party to this
Agreement shall take all such necessary or desirable action.

            Section 5.08. Exchange Listing. ISP Holdings shall use its best
efforts to effect, on or before the Effective Date, approval for listing on the
New York Stock Exchange (the "NYSE") upon official notice of issuance, the
shares of New ISP Common Stock to be issued pursuant to the Merger.

            Section 5.09. Expenses. All costs and expenses incurred in
connection with this Agreement and the transactions contemplated hereby shall be
paid by the party incurring such expenses except as expressly provided herein;
provided, however, that in the event that the Merger is not consummated, all
costs and expenses incurred in connection with this Agreement by both parties
hereto, shall be paid exclusively by ISP Holdings.

            Section 5.10. Inspection of Records. From the date hereof to the
Effective Date, each of ISP Holdings and ISP shall (i) allow all designated
officers, attorneys, financial advisors, accountants and other representatives
of the other reasonable access at all reasonable times to the offices, records
and files, correspondence, audits and properties, as well as to all information
relating to commitments, contracts, titles and financial position, or otherwise
pertaining to the business and affairs, of ISP Holdings and ISP and their
respective subsidiaries, as the case may be, (ii) furnish to the other, the
other's counsel, financial advisors, auditors and other authorized
representatives such financial and operating data and other information as such
persons may reasonably request and (iii) instruct the employees, counsel and
financial advisors of ISP Holdings and ISP, as the case may be, to cooperate
with the other in the other's investigation of the business of it and its
subsidiaries.

            Section 5.11. Transfer of Assets. ISP shall take, no later than
immediately prior to the Effective Date and in accordance with the direction of
ISP Holdings herein made, all steps necessary to effect the Transfer.




                                  24
<PAGE>
                                   ARTICLE VI
                        CONDITIONS TO THE OBLIGATIONS OF
                               ISP HOLDINGS OR ISP

            The respective obligations of each party to effect the Merger shall
be subject to the fulfillment on or prior to the Closing Date (as defined in
Section 9.01) of the following conditions:

            Section 6.01. Stockholder Approval of Agreement. This Agreement and
the transactions contemplated hereby shall have been adopted by (i) the
affirmative vote of the holders of at least a majority of the outstanding shares
of ISP Common Stock at the ISP Stockholders Meeting and (ii) the affirmative
vote (or written consent in lieu thereof) of at least a majority of the
outstanding shares of ISP Holdings Common Stock.

            Section 6.02. Certain Proceedings. No preliminary or permanent
injunction or restraining order or other order, decree or ruling issued by any
court of competent jurisdiction nor any statute, rule, regulation or order
entered, promulgated or enacted by any governmental, regulatory or
administrative agency or authority shall be in effect which would prevent the
consummation of the Merger or the other transactions contemplated by this
Agreement (each party agreeing to use its best efforts (as set forth in Section
6.05 hereof) to have any such injunction or restraining order or other order,
decree or ruling lifted) and no action, suit, claim or proceeding by a
governmental authority before any domestic court, governmental commission or
administrative or regulatory authority shall have been commenced and be pending
which seeks to restrain, prevent or materially delay or restructure the
transactions contemplated by this Agreement or which otherwise questions the
validity or legality of any such transaction, other than actions, suits, claims
and proceedings which, in the reasonable opinion of counsel to the relevant
party, are unlikely to result in an adverse judgment.

            Section 6.03. Registration Statement. The Registration Statement
shall have been declared effective and no stop order suspending such
effectiveness shall have been issued or proceedings for that purpose shall have
been instituted.

            Section 6.04. Tax Opinion. There shall have been delivered to ISP
and ISP Holdings an opinion of Weil,


                                  25
<PAGE>
Gotshal & Manges LLP, which opinion shall be reasonably satisfactory to the
Committee, to the effect that for federal income tax purposes (i) the Transfer
and Merger will be treated as tax-free transactions pursuant to Sections 351 and
368 of the Code and (ii) no income, gain or loss will be recognized by ISP
Holdings, ISP, Newco, any of their respective subsidiaries or any Unaffiliated
Stockholder by reason of the Transfer and/or the Merger. In rendering such
opinion, Weil, Gotshal & Manges LLP shall receive and be entitled to rely upon
reasonable customary representations to be contained in certificates of ISP and
ISP Holdings.

            Section 6.05. NYSE Listing. The shares of New ISP Common Stock
required to be issued in the Merger shall have been approved for listing on the
NYSE, subject to official notice of issuance.

            Section 6.06. Blue Sky Laws. ISP Holdings shall have received all
Blue Sky Law authorizations necessary to issue the shares of New ISP Common
Stock in the Merger.

            Section 6.07. Regulatory Approvals. All consents, approvals, permits
and authorizations required to be obtained prior to the Effective Date from
governmental and regulatory authorities in connection with the execution and
delivery of this Agreement and the consummation of the transactions contemplated
hereby by ISP Holdings and ISP shall have been obtained without restrictions,
except where the failure to obtain such consents, approvals, permits and
authorizations would not have a Material Adverse Effect.

            Section 6.08. Transfer. The Transfer shall have been consummated to
the reasonable satisfaction of ISP Holdings and ISP.


                                   ARTICLE VII
                       CONDITIONS TO THE OBLIGATION OF ISP

            The obligation of ISP to effect the Merger shall be subject to the
satisfaction or waiver, on or before the Closing Date, of the following
conditions:

            Section 7.01. Representations and Warranties True. The
representations and warranties of ISP Holdings contained herein shall be true
and correct in all material respects as of the date of this Agreement and as of
the Closing Date as though made on and as of the Closing Date.



                                  26
<PAGE>
            Section 7.02. Performance of Obligations. ISP Holdings shall have
performed in all material respects its agreements contained in this Agreement
required to be performed by it on or prior to the Effective Date.


                                  ARTICLE VIII
                  CONDITIONS TO THE OBLIGATION OF ISP HOLDINGS

            The obligation of ISP Holdings under this Agreement to effect the
Merger shall be subject to the satisfaction or waiver, on or before the Closing
Date, of the following conditions:

            Section 8.01. Representations and Warranties True. The
representations and warranties of ISP contained herein shall be true and correct
in all material respects as of the date of this Agreement and as of the Closing
Date as though made on and as of the Closing Date.

            Section 8.02. Performance of Obligations. ISP shall have performed
in all material respects its agreements contained in this Agreement required to
be performed by it on or prior to the Effective Date.


                                   ARTICLE IX
                                     CLOSING

            Section 9.01. Time and Place. Subject to the provisions of Articles
VI, VII, VIII and X, the closing of the Merger (the "Closing") shall take place
at the offices of Weil, Gotshal & Manges LLP, 767 Fifth Avenue, New York, New
York 10153, as soon as practicable but in no event later than two business days
after the date on which each of the conditions set forth in Articles VI, VII and
VIII has been satisfied or waived by the party or parties entitled to the
benefit of such condition; or at such other place, at such other time, or on
such other date as ISP Holdings and ISP may mutually agree. The date on which
the Closing actually occurs is herein referred to as the "Closing Date."

            Section 9.02. Filings at the Closing. Subject to the provisions of
Articles VI, VII and VIII hereof, immediately after the Closing ISP Holdings and
ISP shall cause the Certificate of Merger to be filed and recorded in accordance
with the provisions of Section 251 of the DGCL, and



                                  27
<PAGE>
shall take any and all other lawful actions and do any and all other lawful
things necessary to cause the Merger to become effective.

                                    ARTICLE X
                           TERMINATION AND ABANDONMENT

            Section 10.01. Termination. This Agreement may be terminated at any
time prior to the Effective Date, whether before or after approval by the
stockholders of ISP or the stockholders of ISP Holdings:

            (a)  by mutual consent of the Boards of Directors
      of ISP Holdings and ISP;

            (b) by ISP Holdings or ISP if, without fault of such terminating
      party, the Merger shall not have been consummated on or before 180 days
      from the date hereof, which date may be extended by the mutual consent of
      the Boards of Directors of ISP Holdings and ISP;

            (c) by ISP Holdings or ISP if any court of competent jurisdiction in
      the United States shall have issued an order (other than a temporary
      restraining order), decree or ruling or taken any other action
      restraining, enjoining or otherwise prohibiting the Merger or the other
      transactions contemplated by this Agreement, and such order, decree,
      ruling or other action shall have become final and nonappealable; or

            (d) by the Committee or ISP Holdings if the Committee determines in
      good faith, after consultation with J.P. Morgan and outside counsel to the
      Committee, that the Committee's fiduciary obligations under applicable law
      require it to withdraw its recommendation of this Agreement and the
      transactions contemplated hereby.

            Section 10.02. Procedure and Effect of Termination. In the event of
the termination of this Agreement pursuant to Section 10.01(a), the Merger shall
be abandoned, without further action by any of the parties hereto. In the event
of termination and abandonment of the Merger by ISP Holdings or ISP pursuant to
Section 10.01(b) or (c), written notice thereof shall forthwith be given to the
other and this Agreement shall terminate and the Merger shall be



                                  28
<PAGE>
abandoned, without further action by any of the parties hereto.


                                   ARTICLE XI

                                  MISCELLANEOUS

            Section 11.01. Amendment and Modification. Subject to applicable
law, this Agreement may be amended, modified or supplemented only by written
agreement of ISP Holdings and ISP at any time prior to the Effective Date with
respect to any of the terms contained herein; provided, however, that after this
Agreement is adopted by the ISP stockholders pursuant to Section 5.04 or by the
ISP Holdings stockholders pursuant to Section 5.05, no such amendment or
modification shall decrease the amount or change the form of consideration to be
delivered to the stockholders of ISP or ISP Holdings, as the case may be.

            Section 11.02. Waiver of Compliance; Consents. Any failure of ISP,
on the one hand, or ISP Holdings, on the other hand, to comply with any
obligation, covenant, agreement or condition herein may be waived by ISP
Holdings or ISP, respectively, only by a written instrument signed by the party
granting such waiver, but such waiver or failure to insist upon strict
compliance with such obligation, covenant, agreement or condition shall not
operate as a waiver of, or estoppel with respect to, any subsequent or other
failure. Whenever this Agreement requires or permits consent by or on behalf of
any party hereto, such consent shall be given in writing in a manner consistent
with the requirements for a waiver of compliance as set forth in this Section
11.02.

            Section 11.03. Indemnification by Surviving Corporation.

            (a) From and after the Effective Date, the Surviving Corporation
shall indemnify, defend and hold harmless each person who is now an officer or
director of ISP against all losses, claims, damages, costs, expenses or
liabilities or in connection with any claim, action, suit, proceeding or
investigation arising out of the fact that such person is an officer or director
of ISP (or out of any action taken by any such person on behalf of ISP),
pertaining to any matter existing or occurring on or prior to the Effective Date
(including the transactions contemplated by this Agreement), whether asserted or
claimed



                                  29
<PAGE>
prior to, or on or after, the Effective Date. In each case such indemnification
shall be to the full extent permitted under applicable law (and the Surviving
Corporation will pay expenses in advance of the final disposition of any such
action or proceeding to each such director or officer of ISP seeking
indemnification hereunder to the full extent permitted by law).

            (b) For a period of six years after the Effective Date, the
Surviving Corporation shall maintain officers' and directors' liability
insurance for all persons currently covered under ISP's officers' and directors'
liability insurance policies, in their capacities as officers and directors, on
terms substantially no less advantageous to the covered persons than such
existing insurance, pertaining to any matter existing or occurring on or prior
to the Effective Date (including the transactions contemplated by this
Agreement), whether asserted or claimed prior to, or on or after the Effective
Date; provided, however, that the Surviving Corporation shall not be required to
maintain or procure such coverage to pay an annual premium in excess of 200% of
the current annual premium paid by ISP for its existing coverage (the "Cap");
and provided, further, that if equivalent coverage cannot be obtained, or can be
obtained only by paying an annual premium in excess of 200% of the Cap, the
Surviving Corporation shall only be required to obtain as much coverage as can
be obtained by paying an annual premium equal to 200% of the Cap.

            (c) This Section 11.03 shall survive the consummation of the Merger.
The provisions of this Section 11.03 are intended to be for the benefit of, and
shall be enforceable by the present directors or officers of ISP, as the case
may be. The rights provided under this Section 11.03 shall be in addition to,
and not in lieu of, any rights to indemnity which any party may have under the
Certificate of Incorporation or By-Laws of ISP or the Surviving Corporation or
any other agreements. If the Surviving Corporation or any of its successors or
assigns (i) consolidates with or merges into any other corporation or entity and
is not the continuing or surviving corporation or entity of such consolidation
or merger or (ii) transfers all or substantially all of its properties or assets
to any individual, corporation or any other entity, in each such case, proper
provision shall be made so that the successors and assigns of the Surviving
Corporation shall assume the obligations set forth in this Section 11.03.




                                  30
<PAGE>
            Section 11.04. Non-Survival of Warranties. Each and every
representation and warranty contained herein shall expire with, and be
terminated and extinguished by, the Merger, or the termination of this Agreement
pursuant to Section 10.01 or otherwise; and thereafter neither ISP Holdings nor
ISP, nor any officer or director thereof shall be under any liability whatsoever
with respect to any such representation or warranty. This Section 11.04 shall
have no effect upon any other obligation of the parties hereto, whether to be
performed before or after the Closing.

            Section 11.05. Notices. All notices and other communications
hereunder shall be in writing and shall be deemed given if delivered personally
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; provided, that notices of a change of address
shall be effective only upon receipt thereof):

            (a)   if to ISP Holdings, to

                  c/o ISP Management Company, Inc.
                  1361 Alps Road
                  Wayne, New Jersey  07470
                  Attention:  General Counsel

                  with a copy to

                  Weil, Gotshal & Manges LLP
                  767 Fifth Avenue
                  New York, New York  10153
                  Attention:  Stephen E. Jacobs, Esq.

            (b)   if to ISP, to

                  International Specialty Products
                  1361 Alps Road
                  Wayne, New Jersey  07470
                  Attention:  General Counsel

                  with a copy to:

                  Dewey Ballantine LLP
                  1301 Avenue of the Americas
                  New York, NY  10019-6092



                                  31
<PAGE>
                  Attention:  Morton A. Pierce, Esq.

            Section 11.06. Assignment. This Agreement and all of the provisions
hereof shall be binding upon and inure to the benefit of the parties hereto and
their respective successors and permitted assigns, but, prior to the Effective
Date, neither this Agreement nor any of the rights, interests or obligations
hereunder shall be assigned by any of the parties hereto without the prior
written consent of the other parties, nor is this Agreement intended to confer
any rights or remedies hereunder upon any other person except the parties
hereto; provided, however, that the provisions of Section 11.03 shall inure to
the benefit of and be enforceable by the persons identified thereunder.

            Section 11.07. Governing Law. This Agreement shall be governed by
the laws of the State of Delaware (without regard to its conflicts of law
provisions) as to all matters, including matters of validity, construction,
effect, performance and remedies.

            Section 11.08. Counterparts. This Agreement may be executed in
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

            Section 11.09. Interpretation. The article and section headings
contained in this Agreement are solely for the purpose of reference, are not
part of the agreement of the parties and shall not in any way affect the meaning
or interpretation of this Agreement. As used in this Agreement, the term (i)
"person" shall mean and include an individual, a partnership, a joint venture, a
corporation, a trust, a limited liability company, an unincorporated
organization and a government or any department or agency thereof and (ii)
"including" and words of similar import shall mean "including, without
limitation."

            Section 11.10. Actions of ISP. Prior to the Effective Date, any
action, approval, authorization, waiver or consent of ISP (including the Board
of Directors of ISP) required or permitted by this Agreement shall be deemed to
have been taken or given only if such action, approval, authorization, waiver or
consent shall have received the approval of the Committee and shall be effective
with such approval.

            Section 11.11. Entire Agreement. This Agreement, including the
documents and instruments referred to herein,



                                  32
<PAGE>
embodies the entire agreement and understanding of the parties hereto in respect
of the subject matter contained herein and supersedes all prior agreements and
understandings of the parties hereto with respect to such subject matter. There
are no promises, representations, warranties, covenants, or undertakings, other
than those expressly set forth or referred to herein.

            Section 11.12. Severability. Any term or provision of this Agreement
which is invalid or unenforceable in any jurisdiction shall, as to such
jurisdiction, be ineffective to the extent of such invalidity or
unenforceability without rendering invalid or unenforceable the remaining terms
and provisions of this Agreement in any other jurisdiction. If any provision of
this Agreement is so broad as to be unenforceable, such provision shall be
interpreted to be only so broad as is enforceable.


            IN WITNESS WHEREOF, ISP Holdings and ISP have caused this Agreement
to be signed by their respective duly authorized officers on the date first
above written.


                                    ISP HOLDINGS INC.

                                    By: /s/ Richard A. Weinberg
                                        ---------------------------------
                                    Name:  Richard A. Weinberg
                                    Title: Senior Vice President &
                                            General Counsel


                                    INTERNATIONAL SPECIALTY PRODUCTS INC.

                                    By: /s/ James P. Rogers
                                        ---------------------------------
                                    Name:  James P. Rogers
                                    Title: Executive Vice President, Finance




                                  33
<PAGE>



FOR IMMEDIATE RELEASE               Contact:
- ---------------------               --------

Monday, March 30, 1998              Christopher W. Nolan
                                    Director, Corporate Development Investor 
                                      Relations
                                    International Specialty Products Inc.
                                    (973) 628-3463


           INTERNATIONAL SPECIALTY PRODUCTS' BOARD APPROVES MERGER OF
           ----------------------------------------------------------
                              ISP INTO ISP HOLDINGS
                              ---------------------


            WAYNE, NJ -- International Specialty Products Inc. (NYSE: "ISP")
announced today that its Board of Directors has approved the merger of the
Company with, and into, ISP Holdings Inc., the owner of 80,5000,000 shares of
the Company's common stock (approximately 84% of the outstanding shares). In the
merger, each outstanding share of the Company's common stock, other than those
held by ISP Holdings, will be converted into one share of publicly-traded common
stock of the surviving corporation in the merger, whose name shall be changed to
International Specialty Products Inc. As part of the transaction, the ownership
of ISP Holdings' shareholders in the surviving corporation will be reduced by
26,666,667 shares, to 53,833,333 shares (approximately 78% of the outstanding
shares of the surviving corporation). The shares of ISP common stock owned by
ISP Holdings, which are being relinquished in the merger, were valued by the
parties at $16.125 per share. As a result of the merger, in addition to the
assets and liabilities of ISP, approximately $400 million of ISP Holdings' debt
and other liabilities, which is net of approximately $162 million of ISP
Holdings' cash and other assets, will remain with the surviving corporation

            The merger was approved by a committee of independent directors of
ISP's Board of Directors, who were advised by J.P. Morgan & Co., Inc., which
rendered an opinion as to the fairness of the merger. The merger is subject to,
among other things, the approval of the holders of a majority of each of the
respective company's common stock, and is expected to be completed during June
1998.

            Samuel J. Heyman, ISP's Chairman of the Board and Chief Executive
Officer commented that "We believe this transaction represents a critical step
in enabling the ISP to address the lack of liquidity in its stock, which has
adversely impacted the Company's stock price for quite some time. In this
connection,



NYFS01...:\01\47201\0035\0297\REL3308S.540
<PAGE>
the merger will enable ISP to utilize equity more freely while eliminating the
need of ISP Holdings to maintain ownership of at least 80% of the Company's
stock in order to avoid certain adverse tax consequences. As a result, ISP will
have greater access to capital markets through equity financing and an increased
ability to use equity for acquisitions and other corporate purposes."


                                     * * * *

            International Specialty Products Inc. is a leading multinational
manufacturer of specialty and fine chemicals, mineral products, filter products
and advanced materials.


                                     * * * *


            This news release shall not constitute an offer to sell or the
solicitation of an offer to buy, nor shall there be an offer or sale of the
securities in the proposed offering in any State in which such offer,
solicitation or sale would be unlawful prior to registration or qualification
under the securities laws of any such State.








                                     2




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