LYONDELL PETROCHEMICAL CO
8-K, 1997-12-12
PETROLEUM REFINING
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                               WASHINGTON, D.C.


                                   FORM 8-K


                            CURRENT REPORT PURSUANT
                         TO SECTION 13 OR 15(D) OF THE
                        SECURITIES EXCHANGE ACT OF 1934


     DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED):  DECEMBER 1, 1997.


                        LYONDELL PETROCHEMICAL COMPANY
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


                                   DELAWARE
                (STATE OR OTHER JURISDICTION OF INCORPORATION)


              1-10145                            95-4160558
       (COMMISSION FILE NUMBER)    (I.R.S. EMPLOYER IDENTIFICATION NO.)


        1221 MCKINNEY STREET, SUITE 1600, HOUSTON, TEXAS          77010
        (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)            (ZIP CODE)

                                (713) 652-7200
             (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE)

                                NOT APPLICABLE
         (FORMER NAME OR FORMER ADDRESS, IF CHANGED SINCE LAST REPORT)
<PAGE>
 
ITEM 2. ACQUISITION OR DISPOSITION OF ASSETS.

On December 1, 1997, Lyondell Petrochemical Company (the "Registrant") and
Millennium Chemicals Inc. ("Millennium") completed a joint venture transaction
to form Equistar Chemicals, LP (the "Partnership"), combining both companies'
olefins and polymers businesses.  In connection with the joint venture
transaction, the Registrant contributed substantially all of the net assets
comprising its ethylene, propylene and polymers businesses (collectively, the
"Lyondell Contributed Business") to Lyondell Petrochemical L.P. Inc. ("Lyondell
LP"), a wholly-owned subsidiary of the Registrant, which in turn contributed the
Lyondell Contributed Business to the Partnership.  In exchange for the
contribution of the Lyondell Contributed Business and a $345 million note
receivable from Lyondell LP to the Partnership, Lyondell LP and Lyondell
Petrochemical G.P. Inc., also a wholly owned subsidiary of the Registrant,
received an aggregate 57% interest in the Partnership.  The consideration
received in exchange for the Lyondell Contributed Business was determined based
upon arms-length negotiations between the Registrant and Millennium, which
simultaneously contributed certain net assets to the Partnership in exchange for
(i) an aggregate 43% interest in the Partnership, (ii) $750 million in cash, and
(iii) approximately $250 million of retained accounts receivable. The joint
venture transaction is described in detail in the Joint Proxy Statement (the
"Joint Proxy Statement") filed by the Registrant and Millennium with the
Securities and Exchange Commission on October 17, 1997; the Joint Proxy
Statement is incorporated herein by reference. The Registrant's stockholders
approved such transaction at a special meeting held on November 20, 1997.

                                       2
<PAGE>
 
ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.

(a)  Financial Statements of Businesses Acquired.

     The Registrant hereby incorporates by reference the financial statements of
     the businesses contributed to the Partnership from pages F-2 through F-24
     of the Joint Proxy Statement.

(b)  Pro Forma Financial Information.

     The Registrant hereby incorporates by reference the Unaudited Pro Forma
     Consolidated Data regarding the Registrant from pages 25 through 30 and the
     Partnership from pages 36 through 37 of the Joint Proxy Statement.

(c)  Exhibits.

     10.25  Asset Contribution Agreement among the Registrant, Lyondell LP and
            the Partnership

     10.26  Asset Contribution Agreement among Millennium, Millennium LP and the
            Partnership.

     10.27  Parent Agreement among the Registrant, Millennium and the
            Partnership.

     20     Joint Proxy Statement (incorporated by reference)

     99     Press Release dated December 1, 1997 of the Registrant.

                                       3
<PAGE>
 
EXHIBIT INDEX

     Exhibit   Document

     10.25     Asset Contribution Agreement among the Registrant, Lyondell LP
               and the Partnership.

     10.26     Asset Contribution Agreement among Millennium, Millennium LP and
               the Partnership.

     10.27     Parent Agreement among the Registrant, Millennium and the
               Partnership.

     20        Joint Proxy Statement *

     99        Press Release dated December 1, 1997 of the Registrant.


* Filed with the Securities and Exchange Commission on October 17, 1997 and
incorporated herein by reference.

                                       4
<PAGE>
 
                                  SIGNATURES



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


Dated: December 10, 1997      LYONDELL PETROCHEMICAL COMPANY


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

                                       5

<PAGE>
 
                                                                   EXHIBIT 10.25

                         ASSET CONTRIBUTION AGREEMENT


                                    BETWEEN


                        LYONDELL PETROCHEMICAL COMPANY,


                        LYONDELL PETROCHEMICAL L.P. INC.


                                      AND


                             EQUISTAR CHEMICALS, LP



                            DATED:  DECEMBER 1, 1997
<PAGE>
 
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
 
                                                                                       Page
                                                                                       ---- 
           <C>          <S>                                                            <C>
 
            SECTION 1   DEFINITIONS..................................................   1
 
            SECTION 2   CONTRIBUTION OF ASSETS; ASSUMPTION OF CERTAIN
                        LIABILITIES..................................................   8
               2.1      Transfer of Assets...........................................   8
               2.2      Excluded Assets..............................................  10
               2.3      Instruments of Conveyance and Assignment.....................  11
               2.4      Further Assurances...........................................  11
               2.5      Assumption of Liabilities....................................  12
               2.6      Excluded Liabilities.........................................  13
               2.7      Master Intellectual Property Agreement.......................  14
               2.8      Employee Matters.............................................  14
               2.9      Joint Contracts..............................................  16
 
            SECTION 3   REPRESENTATIONS AND WARRANTIES OF THE CONTRIBUTOR............  16
               3.1      Due Organization; Good Standing and Power....................  16
               3.2      Authorization and Validity of Agreements.....................  16
               3.3      No Consents Required; No Conflict with Instruments to which
                        the Contributor is a Party...................................  17
               3.4      Employee Benefits............................................  17
               3.5      Title to Assets; Absence of Liens and Encumbrances; Leases...  18
               3.6      Title Matters; Defects in Improvements.......................  19
               3.7      Working Capital..............................................  19
               3.8      Technology and Similar Rights................................  20
               3.9      Government Licenses, Permits and Related Approvals...........  20
               3.10     All Necessary Assets.........................................  20
               3.11     Conduct of Business in Compliance with Regulatory and
                        Contractual Requirements.....................................  20
               3.12     Legal Proceedings............................................  20
               3.13     Consents.....................................................  20
               3.14     Tax Matters..................................................  21
               3.15     [Reserved]...................................................  21
               3.16     HSE Matters..................................................  21
               3.17     Investigation to Acquire Knowledge...........................  22
 
            SECTION 4   REPRESENTATIONS AND WARRANTIES OF THE PARTNERSHIP............  22
               4.1      Due Organization; Good Standing and Power....................  22
               4.2      Authorization and Validity of Agreement......................  22
               4.3      No Consents Required; No Conflict with Instruments to which the

                                      -i-
</TABLE> 
<PAGE>
 
<TABLE>
<CAPTION>
 
           <C>          <S>                                                            <C>

                        Partnership is a Party......................................   22
 
            SECTION 5   COVENANTS SUBSEQUENT TO CLOSING DATE........................   23
               5.1      Access to Information.......................................   23
               5.2      Mail or Other Communications................................   23
               5.3      Use of Contributor's Trade Name.............................   23
               5.4      Closing Date Balance Sheet..................................   24
               5.5      Payment of Retained Accounts Payable........................   24
               5.6      Collection of Accounts Receivable...........................   24
               5.7      Reimbursement for Prepaid Expenses..........................   24
 
            SECTION 6   SURVIVAL AND INDEMNIFICATION.................................  24
               6.1      Survival Limitations.........................................  24
               6.2      Indemnification..............................................  25
               6.3      Procedures...................................................  28
               6.4      Subrogation..................................................  30
               6.5      Claims for HSE Work..........................................  30
               6.6      EXTENT OF INDEMNIFICATION....................................  30
 
            SECTION 7   MISCELLANEOUS................................................  30
               7.1      Construction.................................................  30
               7.2      Payment of Certain Expenses and Taxes........................  31
               7.3      Notices                                                        32
               7.4      [Reserved]...................................................  33
               7.5      Binding Effect; Benefit......................................  33
               7.6      Occasional and Bulk Sales....................................  33
               7.7      Assignability................................................  33
               7.8      Amendment; Waiver............................................  33
               7.9      Dispute Resolution...........................................  33
               7.10     Severability.................................................  33
               7.11     Counterparts.................................................  34
               7.12     APPLICABLE LAW...............................................  34
               7.13     JURISDICTION; CONSENT TO SERVICE OF PROCESS; WAIVER..........  34
               7.14     WAIVER OF JURY TRIAL.........................................  34
</TABLE>
                                     -ii-
<PAGE>
 
                                     -iii-
<PAGE>
 
                  LIST OF SCHEDULES AND EXHIBITS TO AGREEMENT

                                Schedules
                                ---------

Schedule A            -    Contributed Business
Schedule 2.1(a)       -    Fee Interests
Schedule 2.1(b)       -    Leases
Schedule 2.1(d)       -    Equipment
Schedule 2.1(k)       -    Contributed Subsidiaries
Schedule 2.2(c)       -    Excluded Tradenames and Logos
Schedule 2.2(h)       -    Certain Excluded Assets
Schedule 2.5(a)(vii)  -    Assumed Indebtedness
Schedule 2.5(a)(x)    -    Assumed Long-Term Liabilities
Schedule 3            -    Disclosure Schedule
 
                                  Appendices
                                  ----------

Appendix A            -  Dispute Resolution Procedures


                                   Exhibits
                                   --------
 
Exhibit A             -  Form of Deeds for Fee Interests
Exhibit B             -  Form of Assignment of Lease for Leaseholds
Exhibit C             -  Form of Bill of Sale and Assignment
Exhibit D             -  Form of Trademark Assignment
Exhibit E             -  Form of Patent Assignment
Exhibit F             -  Form of Assumption Agreement
Exhibit G             -  Form of Master Intellectual Property Agreement
 
                                     -iv-
<PAGE>
 
                          ASSET CONTRIBUTION AGREEMENT



     ASSET CONTRIBUTION AGREEMENT (this "Agreement"), dated as of December 1,
1997, between Lyondell Petrochemical Company, a Delaware corporation (the
"Contributor"), Lyondell Petrochemical L.P. Inc., a Delaware corporation (the
"Contributing Partner") and Equistar Chemicals, LP, a Delaware limited
partnership (the "Partnership").

     WHEREAS,  the Contributor owns all of the issued and outstanding shares of
capital stock of Contributing Partner and the Contributing Partner is a partner
in the Partnership;

     WHEREAS, the Contributor wishes to contribute the assets subject to certain
liabilities associated with the olefins, polyolefins and related petrochemicals
businesses described in Schedule A (the "Contributed Business") to the
Contributing Partner; and

     WHEREAS, the Contributing Partner wishes to contribute such assets and
liabilities to the Partnership, and the Partnership wishes to accept such assets
and assume such liabilities, all upon the terms and conditions hereinafter set
forth; and

     WHEREAS, the Partnership will consummate certain transactions and enter
into certain agreements as provided for in the Master Transaction Agreement,
dated as of July 25, 1997, between Lyondell Petrochemical Company and Millennium
Chemicals Inc., as amended (the "Master Transaction Agreement").

     NOW THEREFORE, in consideration of the premises and of the mutual covenants
of the parties hereto, it is hereby agreed as follows:


                                   SECTION 1
                                  DEFINITIONS

     The terms used in this Agreement have the following definitions or are
defined in the Sections referenced below:

     "Accounts Receivable" constitute, as of the Closing Date, all uncollected
accounts receivable that have been generated by, or are attributable to, the
Contributor's operation prior to the Closing Date of the Contributed Business in
the ordinary course and in all respects in a manner consistent with the
provisions of Section 3.2 of the Master Transaction Agreement.

     "Affiliate" means any Person that directly or indirectly through one or
more intermediaries, controls or is controlled by or is under common control
with the Person specified; provided, 
<PAGE>
 
however, that for purposes of this Agreement: (i) Atlantic Richfield Company and
any Person controlled by it shall not be considered an Affiliate of Contributor;
and (ii) neither the Partnership nor any Person controlled by it shall be
considered an Affiliate of the Contributor. For purposes of this definition, the
term "control" shall have the meaning set forth in 17 CFR 230.405 as in effect
on the date hereof.

     "Agreed Rate" means the base commercial lending rate announced by Citibank,
N.A. (or its successor) at its principal office in effect from time to time,
such interest rate to change automatically, effective as of the date of each
change in such base rate.

     "Agreement" is defined in the Preamble.

     "Assets" means all of the assets, rights and properties being contributed,
conveyed, assigned, transferred and delivered to the Partnership pursuant to
Section 2.1.

     "Assignment and Assumption Agreements" means the Deeds, the Assignments of
Lease, the Bill of Sale and Assignment, the Trademark Assignment, the Patent
Assignment and the Assumption Agreement.

     "Assignments of Lease" is defined in Section 2.3(a).

     "Associated Rights" is defined in Section 2.1(c).

     "Assumed Liabilities" is defined in Section 2.5(a).

     "Authority" means any government or governmental or regulatory body
thereof, or political subdivision thereof, whether federal (or any commonwealth,
territory or possession thereof), state, local or foreign, or any agency,
department or instrumentality thereof, or any court or arbitrator (public or
private).

     "Basic Severance" is defined in Section 2.8(b).

     "Capital Spares" means the inventory of spare parts used by the Contributor
in the Contributed Business and owned by the Contributor as of the Closing Date.

     "CERCLA" is defined in Section 3.16(b).

     "Chemical Substance" means any (i) chemical substance, pollutant,
contaminant, constituent, chemical, mixture, raw material, intermediate, product
or byproduct that is regulated (including any requirement for the reporting of
any Release thereof) under any HSE Law or defined or listed as an industrial,
toxic, deleterious, harmful, radioactive, infectious, disease-causing or
hazardous 

                                      -2-
<PAGE>
 
substance, material or waste under any HSE Law, and (ii) petroleum or any
fraction thereof, asbestos or asbestos-containing material or polychlorinated
biphenyls ("PCBs").

     "Closing" means the closing of the transactions contemplated by the Master
Transaction Agreement.

     "Closing Date" means the date hereof.

     "Closing Date Balance Sheet" is defined in Section 5.4.

     "Code" means the Internal Revenue Code of 1986, as amended.

     "Consent" means any consent, waiver, appraisal, authorization, exception,
registration, license or declaration of or by any Person or any Authority, or
any expiration or termination of any applicable waiting period under any Legal
Requirement, required with respect to the Contributed Business or the
Contributor or any Affiliate thereof in connection with (i) the execution and
delivery of this Agreement or any of the Related Agreements or (ii) the
consummation of the transactions contemplated hereby or thereby.

     "Contracts" means contracts, maintenance and service agreements, purchase
commitments for materials and other services, advertising and promotional
agreements, leases, taxation agreements with any Authority, and other
agreements.

     "Contributed Contracts" is defined in Section 2.1(f).

     "Contributed Business" is defined in the Preamble.

     "Contributed Intellectual Property" is defined in Section 2.1(g).

     "Contributed Subsidiaries" is defined in Section 2.1(k).

     "Contributor" is defined in the Preamble.

     "Deeds" is defined in Section 2.3(a).

     "De Minimis Claim" means any Third Party Claim for which the Liability
associated therewith is less than $25,000.

     "Employee Plan" is defined in Section 3.4(a)(i).

     "Encumbrance" means any lien, charge, encumbrance, security interest, title
defect, option or any other restriction or third party right.

                                      -3-
<PAGE>
 
     "Environment" is defined in this Section 1 in the definition of "HSE Laws".

     "Equipment" is defined in Section 2.1(d).

     "Excluded Assets" is defined in Section 2.2.

     "Excluded Liabilities" is defined in Section 2.6.

     "Fee Interests" is defined in Section 2.1(a).

     "GAAP" means United States generally accepted accounting principles, as in
effect from time to time.

     "Government Licenses" means all licenses, permits or franchises issued by
any Authority relating to the operation, development, use, maintenance or
occupancy of the Facilities or any other Asset or of the Contributed Business to
extent that such licenses, permits or franchises relate principally to the
normal operation and conduct of the Contributed Business.

     "HSE Claim" means (i) any actions, events, circumstances or
responsibilities (including compliance actions or requirements) that are
necessary to comply with HSE Laws but only to the extent that any of the
foregoing give rise to out of pocket costs or expenses or result in a Liability
that is required by GAAP to be reflected on the balance sheet of the applicable
party or (ii) any third party (including private parties, Authorities and
employees acting on each such party's own behalf or on the behalf of other third
parties) actions, lawsuits, claims, investigations or proceedings arising under
HSE Laws.

     "HSE Laws" means any Legal Requirements or rule of common law now in effect
(including any amendments now in effect) and any current judicial or
administrative interpretation thereof, including any judicial or administrative
order, consent decree, or judgment, relating to (i) any ambient air, surface
water, drinking water, groundwater, land surface, subsurface strata, river
sediment, natural resources or real property and the physical buildings,
structures and fixtures thereon, including sewer, septic and waste treatment,
storage or disposal systems (the "Environment"), including pollution,
contamination, cleanup, preservation, protection and reclamation of the
Environment; (ii) health or safety, including the exposure of employees and
other Persons to any Chemical Substance; (iii) the Release or threatened Release
of any Chemical Substance, noxious noise or odor, including investigation,
study, assessment, testing, monitoring, containment, removal, remediation,
response, cleanup and abatement of such Release or threatened Release; and (iv)
the management of any Chemical Substance, including the manufacture, generation,
formulation, processing, labeling, use, treatment, handling, storage, disposal,
transportation, distribution, re-use, recycling or reclamation of any Chemical
Substance.

                                      -4-
<PAGE>
 
     "HSE Proceeding" is defined in Section 3.16(d).

     "Indemnified Party" is defined in Section 6.3(a).

     "Indemnifying Party" is defined in Section 6.3(a).

     "Intellectual Property" means research material, technical information,
marketing information, patent rights, patent licenses, pending patent
applications, trade secrets, technical information, know-how, management
information systems, technology, quality control data, specifications, designs,
drawings, software, sales promotion literature and advertising materials.

     "Inventory" means materials used by the Contributor in the Contributed
Business and owned by the Contributor as of the Closing Date including raw
materials, feed stocks, supplies, additives, pigments, process chemicals,
packaging materials (to the extent the Partnership's use thereof would be
consistent with Section 5.3), catalysts, work-in-process and finished goods that
relate principally to the normal operation and conduct of the Contributed
Business.

     "Inventory Tax" is defined in Section 7.2(d).

     "Knowledge" with respect to the Contributor means the actual knowledge of
(i) any plant manager, (ii) any officer of the Contributor having
responsibilities with respect to the Contributed Business, and (iii) any
employee reporting directly to an officer described in clause (ii), in each case
employed by the Contributor in connection with the Contributed Business.

     "Leased Premises" is defined in Section 2.1(b).

     "Leaseholds" is defined in Section 2.1(b).

     "Leases" is defined in Section 2.1(b).

     "Legal Requirement" means any law, statute, rule, ordinance, decree,
requirement, regulation, order or judgment of any Authority, including the terms
of any Government License.

     "Liability" is defined in Section 6.2(a).

     "Licensed Technology" means the technology licensed to the Partnership
pursuant to the Master Intellectual Property Agreement.

     "Licensed Trademarks" means the trademarks licensed to the Partnership
pursuant to the Master Intellectual Property Agreement.

                                      -5-
<PAGE>
 
     "Lowest Cost Response" means the response required or allowed under HSE
Laws that addresses the Chemical Substances present at the lowest cost
(considered as a whole taking into consideration any negative impact such
response may have on the conduct of the Contributed Business and any potential
additional costs or liabilities that may arise as a result of such response) as
compared to any other response that is consistent with HSE Laws.  Taking no
action shall constitute the Lowest Cost Response if, after investigation, taking
no action is determined to be consistent with HSE Laws.  If taking no action is
not consistent with HSE Laws, the least costly non-permanent remedy (such as
mechanisms to contain or stabilize Chemical Substances, including caps, dikes,
encapsulation, leachate collection systems, etc.) shall be the Lowest Cost
Response, provided that such non-permanent remedy is consistent with HSE Laws
and less costly than the least costly permanent remedy (such as the excavation
and removal of soil).

     "Master Intellectual Property Agreement" is defined in Section 2.7.

     "Master Transaction Agreement" is defined in the fourth WHEREAS clause.

     "Material Adverse Effect" means any adverse circumstance or consequence
that, individually or in the aggregate, has an effect that is material to the
financial condition, results of operations, assets or business of the
Contributed Business or the Assets, taken as a whole.

     "Neutral" means a neutral Person acceptable to each of the appointing
parties and not affiliated with any of the parties or their Affiliates.

     "Partnership" is defined in the Preamble.

     "Partnership Employees" is defined in Section 2.8(a).

     "Patent Assignment" is defined in Section 2.3(a).

     "PCBs" is defined in this Section in the definition of "Chemical
Substance".

     "Person" means any natural person or any corporation, partnership, limited
liability company, joint venture, association, trust or other entity or
organization.

     "Pre-Closing Contingent Liabilities" means all Liabilities of every kind
and nature arising out of, in connection with or related to the ownership,
operation or use prior to the Closing Date of the Assets or the Contributed
Business other than the Liabilities referred to in Sections 2.5(a)(i), (ii),
(iii),  (vii) and (ix).

                                      -6-
<PAGE>
 
     "Prepaid Expenses" means the balances in the prepaid accounts consistent
with GAAP of the Contributor or its Affiliates, as of the Closing Date, that are
associated with the Contributed Business and that will have value to the
Partnership in owning and operating the Contributed Business after the Closing
Date.

     "Property Tax" is defined in Section 7.2(c).

     "Related Agreements" means the Master Transaction Agreement, Tier 1 Related
Agreements (other than this Agreement) and Tier 2 Related Agreements of the
Contributor or its Affiliates, as such terms are defined in the Master
Transaction Agreement.

     "Release" means any release, spill, emission, leaking, pumping, injection,
deposit, disposal, dumping, discharge, dispersal, leaching, escaping, emanation
or migration of any Chemical Substance in, into or onto the Environment of any
kind whatsoever, including the movement of any Chemical Substance through or in
the Environment, exposure of any type in any workplace, any release as defined
under the Comprehensive Environmental Response, Compensation and Liability Act
of 1980, as amended, or any other HSE Law and any noxious noise or odor
emission.

     "Retained Accounts Payable" means, as of the Closing Date, all current
trade accounts payable and current accrued expenses other than those related to
employee vacation and lag-week accruals for employees that become Partnership
Employees.

     "SEC Reports" means the 1996 Annual Report on Form 10-K and the 10-Q for
the first quarter of 1997 of the Contributor required to be filed with the
Securities and Exchange Commission.

     "Seven Year PCCL Claims" means Third Party Claims (other than any De
Minimis Claim) related to Pre-Closing Contingent Liabilities that have been or
are asserted within seven years after the Closing Date.

     "Shared Services Agreements" means the agreements between the Contributor
(or its Affiliates) and the Partnership set forth on Appendix B-2 of the Master
Transaction Agreement.

     "Stores Inventory" means the inventory of spare parts, excluding Capital
Spares, that are used by the Contributor or any Affiliate thereof in the
Contributed Business and owned by the Contributor or any Affiliate thereof as of
the Closing Date  and that consist of items that generally can be used for
several processes or types of equipment, including, but not limited to, such
items as pumps, motors, pipe fittings, electrical wiring, instruments, nuts and
bolts, unfabricated metals, safety items, small hand tools and other
miscellaneous repair parts or supplies.

                                      -7-
<PAGE>
 
     "Taxes" means all taxes, charges, fees, levies or other assessments imposed
by any taxing Authority, including, but not limited to, income, gross receipts,
excise, property, sales, use, transfer, payroll, license, ad valorem, value
added, withholding, social security, national insurance (or other similar
contributions or payments), franchise, severance and stamp taxes (including any
interest, fines, penalties or additions attributable to, or imposed on or with
respect to, any such taxes, charges, fees, levies or other assessments).

     "Third Party Claim" means any allegation, claim, civil or criminal action,
proceeding, charge or prosecution brought by a Person other than the
Contributor, any Affiliate thereof, the Partnership, or any member of the
Millennium Group (as defined in the Master Transaction Agreement).

     "Trademarks" means trade names, trademarks, trademark registrations or
trademark applications, copyrights, copyright applications or copyright
registrations or any derivative thereof or design used in connection therewith.

     "Trademark Assignment" is defined in Section 2.3(a).

     "Unrecorded Assets" is defined in Section 2.1(e).

     "WARN" is defined in Section 2.8(f).


                                   SECTION 2
           CONTRIBUTION OF ASSETS; ASSUMPTION OF CERTAIN LIABILITIES

     2.1  Transfer of Assets.  On the terms and subject to the conditions set
forth in this Agreement, on the date hereof, the Contributor contributes to the
Contributing Partner and the Contributing Partner is contributing, conveying,
assigning, transferring and delivering to the Partnership, or shall cause to be
contributed, conveyed, assigned, transferred and delivered to the Partnership,
and the Partnership shall accept, acquire and assume all of the assets, rights,
and properties used or held for use in the contemplated operation and conduct of
the Contributed Business of every kind, nature, character and description,
tangible and intangible, real, personal or mixed, wherever located other than
the Excluded Assets; and which conveyance, subject to Section 2.2, shall
include, without limitation, the following:

     (a) All right, title and interest of the Contributor and any Affiliate
thereof in the parcels of land described as fee property on Schedule 2.1(a),
together with all buildings, structures, fixtures and other improvements
situated thereon and all right, title and interest of the Contributor and any
Affiliate thereof under easements, privileges, rights-of-way, riparian and other
water rights, lands underlying any adjacent streets or roads, appurtenances and
licenses to the extent pertaining to or accruing to the benefit of the land (the
"Fee Interests");

                                      -8-
<PAGE>
 
     (b) All right, title  and interest of the Contributor and any Affiliate
thereof under the leases and subleases, all amendments thereto and all
agreements related thereto described on Schedule 2.1(b) (the "Leases"), for the
use and occupancy of the premises described therein (the "Leased Premises"),
together with all buildings, structures, fixtures and other improvements
situated thereon and, all rights and interests of the Contributor and any
Affiliate thereof under all easements, privileges, rights-of-way, riparian and
other water rights, appurtenances and licenses pertaining to the Leases or
accruing to the benefit of the tenant under the Leases (the "Leaseholds");
 
     (c) All right, title and interest of the Contributor and any Affiliate
thereof, if any, in lands, or real property of others, used principally in the
normal operation and conduct of the Contributed Business (the "Associated
Rights"), including, without limitation, all contracts, easements, rights-of-
way, permits, licenses and leases and other similar rights for related
equipment, power and communications cables, and other related property and
equipment used principally in the normal operation and conduct of the
Contributed Business;

     (d) All of the right, title and interest of the Contributor and any
Affiliate thereof in and to the equipment, furniture, furnishings, fixtures,
machinery, Capital Spares, vehicles, tools, computers and other tangible
personal property used principally in the  normal operation and conduct of the
Contributed Business including without limitation the items listed on Schedule
2.1(d), (the equipment described in this Section 2.1(d), to be referred to
collectively as the "Equipment") and all warranties and guarantees, if any,
express or implied, existing for the benefit of the Contributor or any Affiliate
thereof in connection with the Equipment to the extent assignable;

     (e) Subject, to the extent applicable, to Section 5.3, all (i) customer
lists, customer credit information (to the extent neither the Contributor nor
any Affiliate thereof is bound to any confidentiality obligation with respect
thereto), customer payment histories and credit limits, vendor lists, catalogs,
and (ii) Intellectual Property to the extent used or contemplated for use
principally in the normal operation and conduct of  (or to the extent under
development for use principally in the normal operation and conduct of) or the
marketing or promotion of, the Contributed Business (collectively, the
"Unrecorded Assets");

     (f) All Contracts, whether or not entered into in the ordinary course of
business, that relate principally to the normal operation and conduct of the
Contributed Business, or in the case of any Contracts under which either the
Contributor or any Affiliate thereof  retains rights with respect to its other
businesses, to the extent any such Contract relates to the operation of the
Contributed Business (all the foregoing excluding Government Licenses, but,
together with all agreements and instruments setting forth the Contributor's and
any of its Affiliates' rights with respect to rights-of-way, privileges,
riparian and other rights, appurtenances, licenses or franchises and in respect
of intellectual property rights, in each case that constitute Assets described
in clauses (a) through (e), of this Section 2.1 to be referred to collectively
as the "Contributed Contracts");

                                      -9-
<PAGE>
 
     (g) Any Trademarks to the extent used or contemplated to be used
principally in the normal operation and conduct of the Contributed Business (all
of the items referred to in this Section 2.1(g), together with the items
referred to in clause (ii) of Section 2.1(e), collectively the "Contributed
Intellectual Property");

     (h) All Government Licenses that are transferable and as to which Consents
to transfer are obtained where required;
 
     (i) The Inventory, Stores Inventory and Prepaid Expenses;

     (j) Subject to Section 5.6, Accounts Receivable.

     (k) All right, title and interest of the Contributor and any Affiliate
thereof in the subsidiaries listed on Schedule 2.1(k) (the "Contributed
Subsidiaries");

     (l) All claims and rights against third parties (including, without
limitation, insurance carriers, indemnitors, suppliers and service providers) to
the extent, but only to the extent that, they relate to the Assumed Liabilities;
provided, however, that to the extent that any claims or rights of the
Contributor against any third parties are not assigned to the Partnership, and
the partnership incurs Liabilities that would create such claims or rights on
behalf of the Contributor, the Contributor shall enforce such claims or rights
for the benefit (and at the cost) of the Partnership to the extent it may
lawfully do so; and

     (m) Any other asset of the Contributor or its Affiliate contributed to the
Partnership pursuant to the terms of this Agreement.
 
     2.2  Excluded Assets.  It is expressly understood and agreed that the
Assets shall not include the following (the "Excluded Assets"):

     (a) Except as otherwise provided in Section 2.1(j), cash and cash
equivalents or similar type investments, such as certificates of deposit,
Treasury bills and other marketable securities;

     (b) Except as may be agreed pursuant to Section 2.8(g), any  assets of any
qualified or non-qualified pension or welfare plans or other deferred
compensation arrangements maintained by the Contributor or any Affiliate thereof
for employees of the Contributor or any Affiliate thereof prior to the Closing
Date;

     (c) Any of the Contributor's or any Affiliate's right, title and interest
in and to (i) the names and logos set forth on Schedule 2.2(c) and any other
statutory names, trade names or trademarks, indications or descriptions of which
such names or any name similar thereto forms a part and (ii) any other trade
names, trademarks, trademark registrations or trademark applications,

                                      -10-
<PAGE>
 
copyrights, copyright applications or copyright registrations or any derivative
thereof or design used in connection therewith that are not used principally in
the normal operation and conduct of and are not uniquely applicable to the
Contributed Business;

     (d) All claims and rights against third parties (including, without
limitation, insurance carriers, indemnitors, suppliers and service providers),
to the extent they do not relate to the Assumed Liabilities;

     (e) Claims for refunds of Taxes for time periods ending on or before the
Closing Date, which Taxes remain the liability of Contributor under this
Agreement;

     (f) Subject to the Master Intellectual Property Agreement, any and all of
the Intellectual Property and Trademarks of the Contributor or any Affiliate
thereof to the extent not used principally in the normal operation and conduct
of or to the extent not applicable to the Contributed Business;

     (g) All items sold in the ordinary course of business prior to the Closing
Date, none of which individually or in the aggregate are material to the normal
operation and conduct of the Contributed Business; and

     (h) The tangible assets, intangible assets, real properties, contracts and
rights, described in Schedule 2.2(h).

     2.3  Instruments of Conveyance and Assignment.  On the Closing Date,  the
Contributor shall:

     (a) deliver or cause to be delivered to the Partnership (i) properly
executed and acknowledged warranty deeds, in substantially the form attached
hereto as Exhibit A (the "Deeds"), for all Fee Interests being conveyed
hereunder, (ii) assignments of lease for the Leases in substantially the form
attached hereto as Exhibit B, (the "Assignments of Lease"), (iii) a bill of sale
and assignment in substantially the form attached hereto as Exhibit C (the "Bill
of Sale and Assignment") conveying title to the Assets (other than the Fee
Interests and Leaseholds) and assigning the Contracts, (iv) an assignment of the
trademarks included in the Assets in substantially the form attached hereto as
Exhibit D (the "Trademark Assignment") and (v) an assignment of patent rights,
licenses and applications included in the Assets in substantially the form
attached hereto as Exhibit E (the "Patent Assignment"); and

     (b) transfer to the Partnership the originals (to the extent the
Contributor or any Affiliate thereof possesses an original and retained no
rights thereunder after the Closing Date) or copies, as appropriate, of the
Contributed Contracts and the originals or copies, as appropriate, of all
current records, files and other data that relate to the Assets and that are
necessary for continuing the normal operation and conduct of the Contributed
Business by the Partnership.

                                      -11-
<PAGE>
 
     2.4  Further Assurances.

     (a) On and from time to time after the Closing Date, the Contributor will
execute and deliver, or cause to be executed and delivered, such other
instruments of conveyance, assignment, transfer and delivery as the Partnership
may reasonably request in order to fulfill and implement the terms of this
Agreement, to vest in the Partnership title to the Assets, or to enable the
Partnership to realize the benefits intended to be afforded hereby.

     (b) On and from time to time after the Closing Date, the Partnership will
execute and deliver, or cause to be executed and delivered, such other
instruments of assumption, conveyance, assignment, transfer, power of attorney
or assurance as the Contributor may reasonably request in order to vest in the
Partnership all of the Assumed Liabilities and to enable the Contributor to
realize the benefits intended to be afforded hereby.

     (c) Notwithstanding any other provision of this Agreement to the contrary,
the Partnership and the Contributor acknowledge and agree that any Government
Licenses, Contributed Contracts or warranties which by their terms require
Consent from any other unaffiliated contracting party thereto shall not be
assigned to the Partnership unless any such Consent has been obtained prior to
the Closing Date.  Following the Closing, the Partnership and the Contributor
shall cooperate with each other and use commercially reasonable efforts to
obtain those Consents that were not obtained prior to the Closing and (i) if
such Consents are obtained following the Closing, the Partnership and the
Contributor shall execute and deliver any other and further instruments of
assignment, assumption, transfer and conveyance and take such other and further
action as the Partnership may request in order to assign to the Partnership any
Government Licenses, Contributed Contracts or warranties to which such Consents
relate and (ii) pending such transfer or issuance to the Partnership, shall
provide, to the extent it may lawfully do so, the Partnership with the benefits
of any such Government Licenses, Contributed Contracts or warranties, in which
case, the Partnership shall promptly assume and discharge (or reimburse the
Contributor or its Affiliate for) all obligations and liabilities associated
with the benefits of such Government Licenses, Contributed Contracts or
warranties so made available to the Partnership.  If the Contributor obtains a
Consent to assign any Government Licenses, Contributed Contract or warranties
after the Closing, each such Government Licenses, Contributed Contract or
warranties shall be deemed to be assigned to the Partnership promptly after such
Consent is obtained.

     (d) Following the Closing, the Contributor, Contributing Partner and the
Partnership shall cooperate in good faith and in a commercially reasonable
manner with respect to all matters pertinent to the carrying into effect of this
Agreement and the discharge by each party of its obligations and liabilities
hereunder and thereunder, and shall furnish to each other such information,
cooperation and assistance as reasonably may be requested in connection with the
foregoing.

                                      -12-
<PAGE>
 
     2.5  Assumption of Liabilities.

     (a) On the terms and subject to the conditions, including Section 6.2, set
forth in this Agreement, on the Closing Date, the debts, liabilities and
obligations of the Contributor and its Contributed Subsidiaries set forth in
this Section 2.5 shall be assumed by the Contributing Partner in connection with
the transfer of Assets to it and shall be assumed by the Partnership in
connection with the transfer of Assets to it, and the Partnership agrees to pay,
perform and discharge all such debts, liabilities and obligations when due:

          (i) All obligations arising after the Closing Date under the Contracts
     and Leases that are assigned to the Partnership hereunder unless and to the
     extent that such obligation arises out of a violation of such Contract or
     Lease prior to the Closing Date;

          (ii) All obligations under purchase orders accepted by the Contributor
     or its Contributed Subsidiaries in the ordinary course of business of the
     Contributed Business prior to the Closing Date that are not filled as of
     the Closing Date;

          (iii)  Current accrued expenses related to employee vacation and lag-
     week accruals for employees that become Partnership Employees;

          (iv) All obligations and liabilities, of every kind and nature,
     without limitation, arising out of, in connection with or related to the
     ownership, operation or use after the Closing Date of the Assets or the
     Contributed Business;

          (v) Seven Year PCCL Claims to the extent the aggregate thereof does
     not exceed $7,000,000;

          (vi) Third Party Claims that are related to Pre-Closing Contingent
     Liabilities and that are first asserted seven years or more after the
     Closing Date;

          (vii)  The obligations for indebtedness described on Schedule
     2.5(a)(vii);

          (viii)  [Reserved];

          (ix) All Liabilities associated with products sold after the Closing
     Date regardless of when manufactured;

          (x) The long-term liabilities set forth on Schedule 2.5(a)(x); and

          (xi) Any other Liability specifically assumed by the Partnership
     pursuant to the terms of this Agreement.

                                      -13-
<PAGE>
 
The liabilities and obligations assumed by the Partnership pursuant to this
Section are sometimes hereinafter referred to collectively as the "Assumed
Liabilities."

     (b) On the Closing Date, the Partnership shall deliver to the Contributor
an instrument of assumption of the Assumed Liabilities substantially in the form
attached hereto as Exhibit F (the "Assumption Agreement").

     2.6  Excluded Liabilities.  Except as otherwise expressly provided in this
Agreement (including, without limitation, Sections 6.2 and 7.2) or the
Assumption Agreement, the Partnership is assuming only the Assumed Liabilities
and is not assuming any other liability or obligation of the Contributor or any
Affiliate thereof, of whatever nature, whether presently in existence or arising
hereafter, whether known or unknown, or whether absolute or contingent, and all
such other liabilities and obligations of the Contributor and any Affiliate
thereof that are not Assumed Liabilities shall be retained by and remain
obligations and liabilities of the Contributor or such Affiliate (all such
liabilities and obligations being herein referred to as the "Excluded
Liabilities"), including the following:

          (i) Any Pre-Closing Contingent Liability that is not an Assumed
     Liability;

          (ii) any obligation or liability relating to the Excluded Assets; and

          (iii)  any obligation (A) for the payment of severance benefits to
     employees of the Contributor or any of its Affiliates except as set forth
     in Sections 2.8(b) or (c), or (B) attributable to Contributor's or any of
     its Affiliates' employment of any employee, agent or independent contractor
     prior to the Closing Date.

     2.7  Master Intellectual Property Agreement.

     On the Closing Date, the Partnership and Contributor shall execute and
deliver a master intellectual property agreement (the "Master Intellectual
Property Agreement") in substantially the form attached hereto as Exhibit G
providing, among other things, the following:

     (a) Non-exclusive, royalty-free licenses to the Partnership of any
Intellectual Property and Trademarks used, contemplated for use or that could be
used, in the Contributed Business that is not conveyed to the Partnership
pursuant to Section 2.1.

     (b) Non-exclusive, royalty-free licenses to the Contributor or its
Affiliates of any Contributed Intellectual Property acquired by the Partnership
pursuant to Section 2.1 of this Agreement used, contemplated for use or that
could be used in the business of the Contributor or its Affiliates.

                                      -14-
<PAGE>
 
     (c) The assignment of the Contributed Intellectual Property to the
Partnership.

     2.8  Employee Matters.  If the Closing Date occurs prior to January 1,
1998, the effective employment date shall be January 1, 1998 and the Contributor
and the Partnership shall enter into an agreement to provide employee services
to the Partnership through December 31, 1997.

     (a) At or prior to the Closing, the Partnership shall determine which
employees of the Contributor or any Affiliate thereof will be offered employment
by the Partnership.  Any such employee that accepts such offer is herein called
a "Partnership Employee."  Partnership Employees shall be employed effective on
(i) January 1, 1998, or (ii) if the Closing Date is after January 1, 1998, the
Closing Date.

     (b) If, within six months after the Closing Date or in anticipation of
Closing, the Contributor or any Affiliate thereof terminates (other than for
cause) the employment of any employee of the Contributor or any Affiliate
thereof who is primarily associated with the Assets or the Contributed Business
but who does not become a Partnership Employee, then the Partnership will pay to
the Contributor an amount equal to the Basic Severance to the extent the
Contributor or any Affiliate thereof pays the Basic Severance to such employee.
"Basic Severance" means two weeks of base pay for each full year of service by
the employee with the Contributor or any Affiliate (or predecessors of either,
to the extent service therefor is credited by the Contributor), subject to a 52
week maximum and a 12 week minimum; provided, however, that with respect to any
employee who has an employment agreement that contains provisions providing for
one or more payments in the event of a change in control of the Contributor,
"Basic Severance" means up to 52 weeks of base pay notwithstanding the
employee's years of service.

     (c) Any Partnership Employee whose employment is terminated by the
Partnership (other than for cause) within six months after the Closing Date
shall be entitled to receive a severance benefit from the Partnership equal to
the Basic Severance (which, for purposes of calculating service time, shall
include the employee's time of service with the Contributor, its predecessors
(to the extent service therefor is credited by the Contributor) and the
Partnership).

     (d) Any employees of the Contributor that the Partnership and the
Contributor agree are necessary for the orderly transfer of the Contributed
Business to the Partnership but who will not become Partnership Employees
("Transition Employees") shall be compensated by the Contributor on terms and
conditions and for a duration to be agreed upon by the Partnership and the
Contributor.  The Partnership shall reimburse the Contributor for any such
agreed upon compensation, including payroll taxes, benefit costs  and workers
compensation premiums and claims, paid by the Contributor to or with respect to
any Transition Employee.

     (e) If any employee of the Contributor is eligible for and receiving short
term disability benefits or sick pay as of the Closing Date and the Partnership
has offered such employee 

                                      -15-
<PAGE>
 
employment by the Partnership, that employee shall become employed by the
Partnership (and become a Partnership Employee for purposes of this Section 2.8)
upon eligibility to return to active employment with the Contributor under the
applicable conditions of the Contributor's short term disability benefits or
sick pay plan. Partnership employment shall not be effective until the
Contributor verifies that the employee has satisfied the conditions (if any) to
return to active employment. Until such time as such employee becomes a
Partnership Employee the Contributor shall continue to bear all costs and
expenses associated with such employee.

     (f) Neither the Contributor nor any of its Affiliates shall, at any time
prior to 60 days after the Closing Date, effect a "plant closing" or "mass
layoff", as those terms are defined in the Worker Adjustment and Retraining
Notification Act of 1988 ("WARN"), affecting in whole or in part any facility,
site of employment, operating unit or employee of the Contributor or any of its
Affiliates without complying fully with the notice and all other applicable
requirements of WARN.

     (g) In connection with the development by the Partnership of benefit plans
and programs for Partnership Employees as provided in the Master Transaction
Agreement, (i) the Contributor may direct the trustee of any of its employee
plans to transfer assets and liabilities in those employee plans associated with
the accrued benefits of Partnership Employees to a comparable Partnership
benefit plan in which the Partnership Employees participate, and (ii) the
Contributor or any of its Affiliates may direct the trustee of its grantor trust
to transfer assets and liabilities relating to any accounts for Partnership
Employees under an executive deferral plan to a trust established by the
Partnership to provide benefits under a comparable non-qualified deferred
compensation plan; provided, however, with respect to (i) and (ii) above, the
assets associated with any such plans, as of the Closing Date, are not less than
the liabilities associated therewith as determined by the Partnership and a
trust to trust transfer of assets does not result in a taxable event.  In
connection with the development and implementation of such plans and programs,
the Partnership agrees, for purposes of calculating service time, to include
each employee's time of service with the Contributor, its predecessors (to the
extent service therefor is credited by the Contributor) or the Partnership.

     (h) To the extent that the Partnership adopts benefit plans or policies
that contemplate the provision of post-retirement life and medical benefits to
the Partnership Employees, the Partnership shall record and recognize, in
accordance with GAAP, the associated liability for providing the post-retirement
life and medical benefits to the Partnership Employees.

     2.9  Joint Contracts.

     (a) Any Contributed Contracts contributed to the Partnership pursuant to
Section 2.1 that relate principally to the Contributed Business but also relate
to the business (other than the Contributed Business) of the Contributor or its
Affiliates will be made available to the Contributor and its Affiliates by the
Partnership pursuant to the Shared Services Agreements and other 

                                      -16-
<PAGE>
 
arrangements by which the Contributor and its Affiliates will enjoy the benefits
of such Contributed Contracts as they relate to their business (other than the
Contributed Business) on the same terms and conditions as the Partnership.

     (b) Any Contracts that relate principally to the business (other than the
Contributed Business) of the Contributor or its Affiliates but also relate to
the Contributed Business will be made available to the Partnership by the
Contributor or its Affiliates pursuant to the Shared Services Agreements and
other arrangements by which the Partnership will enjoy the benefits of such
Contracts as they relate to the Contributed Business on the same terms and
conditions as the Contributor or its Affiliates.


                                   SECTION 3
               REPRESENTATIONS AND WARRANTIES OF THE CONTRIBUTOR

     Except as set forth on Schedule 3 or in the SEC Reports, the Contributor
represents and warrants to the Partnership as follows:

     3.1  Due Organization; Good Standing and Power.  The Contributor is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware and has the corporate power and authority to own, lease
and operate the properties to be contributed hereunder and to conduct the
Contributed Business as now conducted by it.  The Contributor has all corporate
power and authority to enter into this Agreement and the Assignment and
Assumption Agreements and to perform its obligations hereunder and thereunder.
The Contributor is duly authorized, qualified or licensed to do business as a
foreign corporation, and is in good standing, in the State of Texas and in each
of the other jurisdictions in which its right, title or interest in or to any of
the Assets held by it, or the conduct of the Contributed Business by it,
requires such authorization, qualification or licensing, except where the
failure to so qualify or to be in good standing would not reasonably be expected
to have a Material Adverse Effect.

     3.2  Authorization and Validity of Agreements.  The execution, delivery and
performance of this Agreement and the other Related Agreements by the
Contributor and the consummation by it of the transactions contemplated hereby
and thereby have been duly authorized by the Board of Directors of the
Contributor.  Except to the extent heretofore obtained, no other corporate or
stockholder action is necessary for the authorization, execution, delivery and
performance by the Contributor of this Agreement and the other Related
Agreements and the consummation by the Contributor of the transactions
contemplated hereby or thereby.  This Agreement and the other Related Agreements
have been duly executed and delivered by the Contributor and constitute legal,
valid and binding obligations of the Contributor, enforceable in accordance with
their terms, except as the same may be limited by bankruptcy, insolvency,

                                      -17-
<PAGE>
 
reorganization, moratorium and other laws relating to or affecting creditors'
rights generally and by general equity principles.

     3.3  No Consents Required; No Conflict with Instruments to which the
Contributor is a Party.  The execution, delivery and performance of this
Agreement and the other Related Agreements by the Contributor or by any
Affiliate of the Contributor that is a party thereto and the consummation by the
Contributor or any such Affiliate  of the transactions contemplated thereby (i)
will not require any Consent except for such Consents the failure of which to be
obtained or made, would not in the aggregate reasonably be expected to have a
Material Adverse Effect; and (ii) will not violate (with or without the giving
of notice or the lapse of time or both), or conflict with, or result in the
breach or termination of any provision of, or constitute a default under, or
result in the acceleration of the performance of the obligations of the
Contributor or any such Affiliate under, or result in the creation of an
Encumbrance upon any Assets or a portion of the Contributed Business pursuant
to, the charter or by-laws of the Contributor or any such Affiliate, or any
indenture, mortgage, deed of trust, lease, licensing agreement, contract,
instrument or other agreement to which the Contributor or any such Affiliate is
a party or by which the Contributor or any such Affiliate or any of the Assets
held by the Contributor or any such Affiliate is bound, except for such
violations, conflicts, breaches, terminations, defaults, accelerations or
Encumbrances which would not in the aggregate reasonably be expected to have a
Material Adverse Effect.

     3.4  Employee Benefits.

     (a   (i)  Each of the Contributor's Defined Benefit and Defined
     Contribution Pension Plans covering employees ("Employee Plan") is in
     substantial compliance with applicable requirements prescribed by any and
     all Legal Requirements, including, but not limited to the Code, except for
     violations the occurrence of which would not in the aggregate reasonably be
     expected to have a Material Adverse Effect.  Each Employee Plan that is
     intended to be qualified under Section 401(a) of the Code currently has a
     favorable determination letter from the Internal Revenue Service as to that
     Plan's qualification under Section 401(a) of the Code and nothing has
     occurred since the date of such letter that could reasonably be expected to
     cause the loss of such qualification.

          (ii)  The Contributor has in all material respects performed all
     obligations required to be performed by it under ERISA, the Code and any
     other applicable Legal Requirements and under the terms of each Employee
     Plan, except such failures to perform which would not in the aggregate
     reasonably be expected to have a Material Adverse Effect.  The Contributor
     has received no written notice of the existence of any material default or
     violation by any other party of any of such Legal Requirements, terms or
     requirements applicable to any of the Employee Plans.

                                      -18-
<PAGE>
 
          (iii)  Other than routine claims for benefits, the Contributor has not
     received any written notice of any pending material claims or lawsuits
     which have been asserted or instituted against any of the Employee Plans,
     the assets of the trust or funds under the Employee Plans, the sponsor or
     administrator of any of the Employee Plans, or against any fiduciary of any
     of the Employee Plans with respect to the operation of such Plan.

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

          (v)  All contributions required to be made under the terms of the
     Contributor's Employee Plans have been timely made.  No Employee Plan has
     an "accumulated funding deficiency" (within the meaning of section 412 of
     the Code or Section 402 of ERISA).

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

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

     3.5  Title to Assets; Absence of Liens and Encumbrances; Leases.

     (a   The Contributor has good and marketable title to all of the Fee
Interests described in the Deeds, free and clear of all Encumbrances, except (i)
those exceptions contained in the Deeds, (ii) liens for current taxes not yet
due and payable and mechanics and similar statutory liens arising in the
ordinary course of business, (iii) liens of employees and laborers for current
wages not yet due; (iv) building, zoning and health regulations of the
jurisdictions in which the Assets are located; and (v) such imperfections of
title, easements and Encumbrances, if any, as do not in the aggregate materially
detract from the value or materially interfere with the use of the Assets as
they are currently being used or as otherwise would not reasonably be expected
to have a Material Adverse Effect.

     (b   The Contributor is the sole lessee under the Leases and the sole party
entitled to the Leasehold interests in favor of the lessee thereunder, and the
sole owner of the improvements situated on the Leased Premises, free and clear
of all Encumbrances affecting the Leaseholds except such Encumbrances, if any,
as do not in the aggregate materially detract from the value or materially

                                      -19-
<PAGE>
 
interfere with the use of the Assets or as otherwise would not reasonably be
expected to have a Material Adverse Effect.  Neither Contributor nor any
Affiliate thereof has received from or delivered to the lessors under the
Leaseholds any written notice of termination or threat of termination of the
respective Leaseholds.  True and complete copies of all written lease agreements
(including any written amendments or modifications thereof) constituting, or
evidencing the terms of, the Leaseholds have been delivered to the Partnership.
No material default or event of default on the part of the Contributor nor any
Affiliate thereof under the provisions of any of the Leaseholds, and no event
that with the giving of notice or passage of time or both would constitute such
default or event of default on the part of the Contributor, has occurred (which
default or event of default has not been cured).  Neither the Contributor nor
any Affiliate thereof has received any written notice from any lessor under any
Leasehold, that any material default or event of default on the part of the
Contributor or such Affiliate as lessee under the provisions of any Leaseholds,
or that any event that with the giving of notice or passage of time or both
would constitute such a default or an event of default on the part of the
Contributor or any such Affiliate, as lessee,  has occurred (which default or
event of default has not been cured).  No material default or event of default
on the part of the lessor under the provisions of any of such Leaseholds, and no
event that with the giving of notice or passage of time or both would constitute
such default or event of default on the part of any such lessor, has occurred
(which default or event of default has not been cured).

     (c   The Contributor or an Affiliate thereof has good title to all of the
personal property purported to be owned by it, free and clear of all
Encumbrances, except for liens for Taxes not yet due and payable and such
Encumbrances, if any, that do not in the aggregate materially detract from the
value or materially interfere with the use of the Assets (as they are currently
being used) or as otherwise would not reasonably be expected to have a Material
Adverse Effect.

     3.6  Title Matters; Defects in Improvements.  There are no trespassers or
other adverse parties in possession on or affecting the Fee Interests or the
Leased Premises that would reasonably be expected to have a Material Adverse
Effect.  Neither the Contributor nor any Affiliate thereof has granted and none
of the foregoing is party to any unrecorded options, rights of refusal, sales
contracts or other such contractual rights in favor of any third parties
relating to the Fee Interests or the Leased Premises.  No written notice has
been received by the Contributor or any Affiliate thereof from any insurance
company with respect to the Fee Interests or the Leased Premises or by any board
of fire underwriters claiming any material defects or deficiencies or requiring
the performance of any repairs, replacement, alteration or other work relating
to the improvements situated thereon (in each case, which have not been cured).

     3.7  Working Capital.  The Contributor has operated the Contributed
Business in the ordinary course of business from March 31, 1997 to the Closing
Date such that the Inventory, Stores Inventory, Prepaid Expenses and Accounts
Receivable, as of the Closing Date, are at substantially the same level as would
have existed for the Contributor without regard to the transactions contemplated
by the Master Transaction Agreement.

                                      -20-
<PAGE>
 
     3.8  Technology and Similar Rights.  The Contributor owns or is licensed to
use all of the Intellectual Property, Licensed Technology and Licensed
Trademarks, and the Intellectual Property, Licensed Technology and Licensed
Trademarks together constitute all relevant patents, pending patent
applications, invention disclosures, copyrights, software, trade secrets,
technical information, technology, know-how, processes, tradenames, trademarks,
trademark registrations or applications, copyrights, copyright applications or
registrations or any derivative thereof or design used in connection therewith
necessary for the normal operation and conduct of the Contributed Business as it
is currently operated and conducted, except where the failure to have such
ownership or licenses would not reasonably be expected to have a Material
Adverse Effect.

     3.9  Government Licenses, Permits and Related Approvals.  The Government
Licenses constitute all those necessary for the normal operation and conduct of
the Contributed Business as it is currently operated and conducted, except where
the failure to have such Government Licenses would not reasonably be expected to
have a Material Adverse Effect.

     3.10 All Necessary Assets.  The Assets together with the rights under the
Related Agreements constitute all property and other rights necessary to enable
the Partnership to operate and conduct the Contributed Business in substantially
the same manner as it is being operated and conducted on the date of this
Agreement, except in all cases where the failure of the Partnership to acquire
such property or other rights by conveyance or license would not in the
aggregate reasonably be expected to have a Material Adverse Effect.

     3.11 Conduct of Business in Compliance with Regulatory and Contractual
Requirements.  The Contributor, and any Affiliate thereof, is operating and
conducting the Contributed Business in compliance with all applicable Legal
Requirements, rights of concession, licenses, know-how or other proprietary
rights of others, the failure to comply with which would reasonably be expected
to have a Material Adverse Effect.

     3.12 Legal Proceedings.  There is no litigation, proceeding, claim,
grievance, arbitration, investigation or other action to which the Contributor
or any Affiliate thereof is a party (i) that is pending or, to the Knowledge of
the Contributor, threatened, (ii) that relates in any way to the Assets, to the
operation or conduct of the Contributed Business, or to the transactions
contemplated by this Agreement, and (iii) that upon resolution adverse to
Contributor or any of its Affiliates, could reasonably be expected to have a
Material Adverse Effect.

     3.13 Consents.  Except for the Consents set forth in Schedule 4.2(e) of the
Master Transaction Agreement, there are no Consents required to be obtained by
the Contributor or any of its Affiliates in connection with the transfer of the
Assets or the Contributed Business to the Partnership except to the extent the
failure to obtain such Consent would not be reasonably likely to have a Material
Adverse Effect.

                                      -21-
<PAGE>
 
     3.14 Tax Matters.

     (a   There are no material liens for Taxes (other than for current Taxes
not yet due and payable) upon the Assets.

     (b   None of the Assets directly or indirectly secures any indebtedness for
money borrowed the interest on which is tax-exempt.

     3.15 [Reserved].

     3.16 HSE Matters.  Except as would not be reasonably likely to have a
Material Adverse Effect:

     (a   (i)  The Fee Interests, the Leased Premises and the operations of the
Contributor and any Affiliate thereof in connection with the Contributed
Business are in compliance with all HSE Laws and (ii) to the extent arising out
of the Contributor's or any Affiliate's ownership or use of the Assets or
operation of the Contributed Business, there are no Chemical Substances held,
located, released, generated, treated, stored or disposed of, on, under or from
the Fee Interests or the Leased Premises or in, on or from any fixtures or
improvement thereon in excess of any standard prescribed or permitted by any HSE
Laws or which require corrective or other action pursuant to the provisions of
any HSE Laws.

     (b   Neither the Contributor nor any Affiliate has received any notice from
any federal, state, or local agency naming the Contributor or such Affiliate as
a potentially responsible party ("PRP"), or otherwise notifying the Contributor
or such Affiliate of any potential liability under either the Comprehensive
Environmental Response, Compensation and Liability Act of 1980, as amended,
("CERCLA" or "Superfund"), the Resource Conservation and Recovery Act of 1976,
as amended ("RCRA"), or any state statute, rule or local regulation imposing
liability similar to CERCLA or RCRA that relates in any way to any Chemical
Substances generated by or derived from the operations on the Fee Interests, or
the Leased Premises; nor has the Contributor nor  any of its Affiliates received
any comparable claim or notice from any private party.

     (c   The Contributor or an Affiliate thereof, as applicable, has been and
is, in compliance with, all permits, licenses, approvals, permission, or
authorizations necessary for its operations in connection with the Contributed
Business to comply in all respects with HSE Laws.

     (d   (i) Neither the Contributor nor any Affiliate thereof has received
written notice of any actual, impending, or potential proceedings, allegations,
claims, losses, actions, investigations or inquiries of any kind in connection
with the Contributed Business and HSE Laws or Chemical Substances ("HSE
Proceedings") and (ii) neither the Contributor nor any Affiliate thereof has any

                                      -22-
<PAGE>
 
Knowledge of any facts, events or occurrences that would reasonably be expected
to result in any HSE Proceedings being brought.

     (e   Neither the Contributor nor any Affiliate thereof is party to, or is
subject to the terms of, any consent order, consent judgment, consent decree,
court or administrative order or judgment, agreement, schedule, or decree issued
by any Authority with respect to the Contributed Business.

     3.17 Investigation to Acquire Knowledge.  Each of the persons covered by
the definition of "Knowledge" set forth in Section 1 has reviewed, with counsel
to the Contributor, the other representations and warranties contained in, and
the Schedules that relate to, this Section 3 to the extent that they relate to
such person's area of responsibility or expertise and has made a reasonable
inquiry as to the accuracy and completeness of such representations, warranties
and Schedules.

                                   SECTION 4
               REPRESENTATIONS AND WARRANTIES OF THE PARTNERSHIP

     The Partnership represents and warrants to the Contributor as follows:

     4.1  Due Organization; Good Standing and Power.  The Partnership is a
limited partnership duly formed and validly existing under the laws of the State
of Delaware.  The Partnership has all partnership power and authority to enter
into this Agreement and  the other Related Agreements and to perform its
obligations hereunder and thereunder.  The Partnership is duly authorized,
qualified or licensed to do business as a foreign partnership, in each of the
jurisdictions in which its right, title or interest in or to any asset, or the
conduct of its business, requires such authorization, qualification or
licensing, except where the failure to so qualify would not have a material
adverse effect on the ability of the Partnership to perform its obligations
hereunder or under the Assignment and Assumption Agreements.

     4.2  Authorization and Validity of Agreement.  The execution, delivery and
performance of this Agreement and the other Related Agreements by the
Partnership and the consummation by the Partnership of the transactions
contemplated hereby and thereby have been duly authorized by all necessary
partnership action on the part of the Partnership.  No other partnership action
is necessary for the authorization, execution, delivery and performance by the
Partnership of this Agreement, the other Related Agreements and the consummation
by the Partnership of the transactions contemplated hereby or thereby. This
Agreement and the other Related Agreements have been duly executed and delivered
by the Partnership and constitute legal, valid and binding obligations of the
Partnership, enforceable in accordance with their terms, except as the same may
be limited by bankruptcy, insolvency, reorganization, moratorium and other laws
relating to or affecting creditors' rights generally and by general equity
principles.

                                      -23-
<PAGE>
 
     4.3  No Consents Required; No Conflict with Instruments to which the
Partnership is a Party.  The execution, delivery and performance of this
Agreement and the other Related Agreements by the Partnership and the
consummation by it of the transactions contemplated thereby (i) will not require
any Consent except for such Consents the failure of which to be obtained or
made, would not in the aggregate reasonably be expected to have a Material
Adverse Effect on the Partnership's ability to perform its obligations hereunder
or thereunder, and (ii) will not violate (with or without the giving of notice
or the lapse of time or both), conflict with, or result in the breach or
termination of any provision of, or constitute a default under, or result in the
acceleration of the performance of the obligations of the Partnership under, the
partnership agreement of the Partnership, or any indenture, mortgage, deed of
trust, lease, licensing agreement, contract, instrument or other agreement to
which the Partnership is a party or by which the Partnership or any of its
assets or properties is bound, except for such violations, conflicts, breaches,
terminations, defaults, accelerations or liens which would not in the aggregate
reasonably be expected to have a material adverse effect on the Partnership's
ability to perform its obligations hereunder or thereunder.

                                   SECTION 5
                      COVENANTS SUBSEQUENT TO CLOSING DATE

     5.1  Access to Information.  Following the Closing Date, the Partnership
shall afford, and will cause its Affiliates to afford, to the Contributor, its
counsel, accountants and other authorized representatives, during normal
business hours, reasonable access to the books, records and other data of the
Contributed Business with respect to the period prior to the Closing Date (and
any personnel familiar therewith) to the extent that such access may be
reasonably required by the Contributor to facilitate (i) the preparation by the
Contributor of such tax returns as it may be required to file with respect to
the operations of the Assets and the Contributed Business or in connection with
any audit, amended return, claim for refund or any proceeding with respect
thereto, (ii) the investigation, litigation and final disposition of any claims
which may have been or may be made against the Contributor in connection with
the Assets and the Contributed Business, (iii) the payment of any amount in
connection with any liabilities or obligations which have not been assumed by
the Partnership under this Agreement and (iv) for any other reasonable business
purpose.  For a period of ten years after the date of this Agreement, the
Partnership will not dispose of, alter or destroy any such books, records and
other data without giving 90 days' prior notice to the Contributor to permit it,
at its expense, to examine, duplicate or repossess such records, files,
documents and correspondence.

     5.2  Mail or Other Communications.  The Contributor authorizes and empowers
the Partnership on and after the Closing Date to receive and open all mail
received by the Partnership relating to the Contributed Business or the Assets
and to deal with the contents of such communications in any proper manner.  The
Contributor shall promptly deliver to the Partnership any mail or other
communication received by it on and after the Closing Date pertaining to the

                                      -24-
<PAGE>
 
Contributed Business or the Assets and any cash, checks or other instruments of
payment to which the Partnership is entitled. The Partnership shall promptly
deliver to the Contributor any mail or other communication received by it after
the Closing Date pertaining to the Excluded Assets or Excluded Liabilities, and
any cash, checks or other instruments of payment in respect of such.

     5.3  Use of Contributor's Trade Name.  Except as set forth on Schedule
2.2(d), after the Closing Date the Partnership shall be permitted to use any
items of Inventory or packaging material, any sales or promotional materials,
any forms or documents or any other printed material that bears the name
"Lyondell" or other statutory names, trade names or trademarks, indications or
descriptions of which such names or any name similar thereto forms a part until
the earlier to occur of (i) such time as inventory of such materials existing as
of the Closing Date are used, or (ii) two years after the Closing Date.

     5.4  Closing Date Balance Sheet.  Not later than 60 days after the Closing
Date, the Contributor shall cause Coopers & Lybrand L.L.P. to prepare and
deliver to the Contributor and the Partnership an audited balance sheet of the
Contributed Business as of the Closing Date (the "Closing Date Balance Sheet").

     5.5  Payment of Retained Accounts Payable.  The Contributor will retain all
accounts payable including Retained Accounts Payable; however the Partnership,
as payment agent of the Contributor, shall pay such amounts on behalf of the
Contributor on a timely basis.  As soon as practicable following the end of each
month after which such Retained Accounts Payable are paid by the Partnership,
but in any event within fifteen days after the end of such month, each
Contributor will reimburse the Partnership for such payments attributable to its
Contributed Business.

     5.6  Collection of Accounts Receivable.  The Partnership shall take all
commercially reasonable efforts to collect the Accounts Receivable; however, to
the extent any Accounts Receivable set forth on the Closing Date Balance Sheet
are not collected within 180 days after the Closing Date by the Partnership, the
Contributor will buy such uncollected Accounts Receivable from the Partnership
at the amount set forth on the Closing Date Balance Sheet.  Collections on
Accounts Receivable shall be applied on a specific identification basis.  The
Partnership will report monthly in writing  to Contributor on the amounts
collected during the preceding month, and shall provide an aging summary of
uncollected accounts and a detailed description of each problem account (45 or
more days overdue).  On reasonable notice to the Partnership, Contributor shall
have the right to take over the collection process for any problem account.

     5.7  Reimbursement for Prepaid Expenses.  The Partnership and the
Contributor acknowledge that the Prepaid Expenses attributable to its
Contributed Business have been conveyed to the Partnership solely in order to
facilitate the timely and efficient transfer of the Contributed Business to the
Partnership.  Consequently, the Partnership shall reimburse the Contributor for

                                      -25-
<PAGE>
 
the Prepaid Expenses associated with its Contributed Business (other than the
prepaid expenses for "turnaround" costs) within 10 days following the receipt of
the Closing Date Balance Sheet.


                                   SECTION 6
                          SURVIVAL AND INDEMNIFICATION

     6.1  Survival Limitations.  The representations and warranties of the
parties hereto contained in this Agreement or in any certificate or other
writing delivered pursuant hereto or in connection herewith shall survive the
Closing until the date that is 60 months after the Closing Date, except (i)
Section 3.14, which shall survive until the expiration of the applicable statute
of limitations and (ii) Section 3.5, which shall survive without limitation and
shall not be merged with the Deeds.  No action can be brought with respect to
any breach of any representation or warranty (except with respect to Section
3.5) pursuant to this Agreement unless a written notice that complies with
Section 6.3 has been delivered pursuant to such Section 6.3 prior to the
expiration of the survival period applicable to such representation or warranty;
provided that upon the giving of such notice, notwithstanding any other
provision of this Agreement the representation and warranty that is the basis of
such action shall continue with respect to such action beyond the time at which
the representation and warranty would otherwise terminate.

     6.2  Indemnification.

     (a   Subject to the other provisions of this Section 6, the Contributor
hereby agrees, to the fullest extent permitted by applicable law, to indemnify,
defend and hold harmless the Partnership and its Affiliates and their respective
officers, directors and employees from, against and in respect of any losses,
claims, damages, fines, penalties, assessments by public agencies, settlement,
cost or expenses (including costs of defense and attorneys' fees) and other
liabilities (any of the foregoing being a "Liability") incurred or suffered by
the Partnership or any of its Affiliates, arising out of, in connection with or
relating to:

          (i)  Any misrepresentation in or breach of the representations and
     warranties of the Contributor or any of its Affiliates in this Agreement,
     the Assignment and Assumption Agreements, the Master Intellectual Property
     Agreement, or the Master Transaction Agreement;

          (ii)  Any failure of the Contributor or any of its Affiliates to
     perform any of its covenants or obligations contained in this Agreement,
     the Assignment and Assumption Agreements, the Master Intellectual Property
     Agreement, or the Master Transaction Agreement;

          (iii)  Excluded Liabilities;

                                      -26-
<PAGE>
 
          (iv)  Any Pre-Closing Contingent Liability that is not an Assumed
     Liability; or

          (v)  Any action by the Contributor or its Affiliates that results in
     the occurrence of a "Designated Event" as such term is defined in the
     Contributor's or its Affiliates' 1989 Indenture and Medium Term Notes
     described in Schedule 2.5 but only to the extent that the Partnership
     incurs an economic loss directly as a result of the occurrence of the
     "Designated Event" and in such case the Contributor's or its Affiliates'
     indemnification obligation is limited to the amount of such economic loss;

provided, however, that the following limitations shall apply to the
Contributor's indemnification obligations in clauses (i) and (iv) above:

          (A) the Contributor shall not have any indemnification obligation
     under clause (i) and (iv) above for any individual Liability unless the
     amount of such Liability exceeds $25,000 (the "Individual Basket") (it
     being understood that all Liabilities arising from the same event,
     condition or set of circumstances shall be considered as an individual
     Liability for purposes of such calculation), but if the amount of such
     Liability exceeds the Individual Basket, the entire amount of such
     Liability, including the first $25,000 of such Liability, may be the
     subject of indemnification hereunder; provided, further, that the parties
     agree that the amount of Liability for which indemnification may be sought
     for breach of any representation or warranty under clause (i) above shall
     be calculated taking into account the Individual Basket but without regard
     to any qualification or exception regarding materiality or Material Adverse
     Effect qualification contained in such representation or warranty (it being
     understood that such materiality or Material Adverse Effect qualifications
     shall apply for purposes of determining whether there has been such a
     breach in the first place, but once it has been established that there is
     such a breach, the Partnership shall be entitled to indemnity relating back
     to the first dollar); and

          (B) to the extent any misrepresentation in or breach of the
     representations and warranties of the Contributor results in a Liability of
     the Partnership in excess of the Individual Basket and such Liability would
     also constitute a Pre-Closing Contingent Liability, such misrepresentation
     or breach shall be treated as a Pre-Closing Contingent Liability.

     (b   NOTWITHSTANDING ANY OTHER PROVISION OF THIS AGREEMENT, TO THE FULLEST
EXTENT PERMITTED BY LAW, NEITHER THE CONTRIBUTOR NOR ANY OF ITS AGENTS,
EMPLOYEES, REPRESENTATIVES OR AFFILIATES SHALL BE LIABLE FOR CONSEQUENTIAL,
INCIDENTAL, INDIRECT OR PUNITIVE DAMAGES IN CONNECTION WITH DIRECT CLAIMS BY THE
PARTNERSHIP (I.E., A CLAIM BY THE PARTNERSHIP THAT DOES NOT SEEK REIMBURSEMENT
FOR A THIRD PARTY CLAIM 

                                      -27-
<PAGE>
 
PAID OR PAYABLE BY THE PARTNERSHIP) WITH RESPECT TO THEIR INDEMNIFICATION
OBLIGATIONS UNDER THIS AGREEMENT UNLESS ANY SUCH CLAIM ARISES OUT OF THE
FRAUDULENT ACTIONS OF THE CONTRIBUTOR. IN DETERMINING THE AMOUNT OF ANY LOSS,
LIABILITY, OR EXPENSE FOR WHICH THE PARTNERSHIP IS ENTITLED TO INDEMNIFICATION
UNDER THIS AGREEMENT, THE GROSS AMOUNT THEREOF WILL BE REDUCED (BUT NOT BELOW
ZERO) BY THE NET PRESENT VALUE OF ANY CORRELATIVE INSURANCE PROCEEDS ACTUALLY
REALIZED BY THE PARTNERSHIP UNDER POLICIES TO THE EXTENT THAT THE FUTURE PREMIUM
RATE WILL NOT BE INCREASED BY CLAIM EXPERIENCE.

     (c   Notwithstanding the provisions of Sections 6.2(a)(i) and 6.2(a)(iv),
it is expressly agreed that the Contributor shall not be required to indemnify
the Partnership for any Liability arising out of, in connection with or related
to any HSE Claim to the extent that the condition, event, circumstance or other
basis for the HSE Claim was exacerbated or accelerated by the Partnership.  The
Partnership shall not be deemed to have exacerbated a condition, event,
circumstance or other basis for an HSE Claim by reason of the continuance
thereof after the Closing (i) under circumstances where the Partnership does not
know of its existence and has not breached any legal duty to have conducted an
investigation or inquiry that would have uncovered the matter or (ii) under
circumstances where the Partnership does know of its existence but is taking
commercially reasonable actions to cure the matter or to otherwise achieve
compliance in a commercially reasonable and prudent manner.

     (d   Subject to the other provisions of this Section 6, the Partnership
hereby indemnifies, to the fullest extent permitted by law, the Contributor and
its Affiliates against and agrees to hold each of them harmless from any and all
Liability incurred or suffered by the Contributor or any of its Affiliates
arising out of or relating to:

          (i)  Any misrepresentation in or breach of the representations and
     warranties of the Partnership or the failure of the Partnership to perform
     any of its covenants or obligations contained in this Agreement and the
     Assignment and Assumption Agreements or the Master Intellectual Property
     Agreement;

          (ii)  Assumed Liabilities; or

          (iii)  Any HSE Claim to the extent arising out of the Partnership's
     exacerbation or acceleration of such HSE Claim.

     (e   NOTWITHSTANDING ANY OTHER PROVISION OF THIS AGREEMENT, TO THE FULLEST
EXTENT PERMITTED BY LAW, NEITHER THE PARTNERSHIP NOR ANY OF ITS AGENTS,
EMPLOYEES, REPRESENTATIVES OR AFFILIATES SHALL BE LIABLE FOR CONSEQUENTIAL,
INCIDENTAL, INDIRECT OR PUNITIVE DAMAGES IN 

                                      -28-
<PAGE>
 
CONNECTION WITH DIRECT CLAIMS BY THE CONTRIBUTOR WITH RESPECT TO THEIR
INDEMNIFICATION OBLIGATIONS UNDER THIS AGREEMENT UNLESS ANY SUCH CLAIM ARISES
OUT OF THE FRAUDULENT ACTIONS OF THE PARTNERSHIP. IN DETERMINING THE AMOUNT OF
ANY LOSS, LIABILITY, OR EXPENSE FOR WHICH THE CONTRIBUTOR IS ENTITLED TO
INDEMNIFICATION UNDER THIS AGREEMENT, THE GROSS AMOUNT THEREOF WILL BE REDUCED
(BUT NOT BELOW ZERO) BY THE NET PRESENT VALUE OF ANY CORRELATIVE INSURANCE
PROCEEDS ACTUALLY REALIZED BY THE CONTRIBUTOR UNDER POLICIES TO THE EXTENT THE
FUTURE PREMIUM RATE WILL NOT BE INCREASED BY CLAIM EXPERIENCE.

     (f   The rights provided to the Partnership pursuant to this Section 6, as
limited by and subject to the provisions of this Section 6, shall be the
Partnership's sole remedy for breach of representation and warranty by or
covenant or obligation of the Contributor under this Agreement,  the Assignment
and Assumption Agreements and the Master Intellectual Property Agreement.  The
rights provided to the Contributor pursuant to this Section 6, as limited by and
subject to the provisions of this Section 6, shall be the Contributor's sole
remedy for breach of representation and warranty by or covenant of obligation of
the Partnership under this Agreement, the Assignment and Assumption Agreements
and the Master Intellectual Property Agreement.

     6.3  Procedures.

     (a   Any Person seeking indemnification under Section 6.2 (the "Indemnified
Party") agrees to give prompt written notice to the party against whom indemnity
is sought (the "Indemnifying Party") of the assertion of any claim that does not
involve a Third Party Claim, which notice shall describe in reasonable detail
the nature of the claim, an estimate of the amount of damages attributable to
such claim to the extent feasible and the basis of the Indemnified Party's
request for indemnification under this Agreement.  If the Indemnifying Party
disputes such claim and such dispute is not resolved by the parties, such
dispute shall be resolved in accordance with Section 7.9.

     (b   If an Indemnified Party is notified of a Third Party Claim which may
give rise to a claim for indemnification against any Indemnifying Party under
this Section, then the Indemnified Party shall promptly notify each Indemnifying
Party thereof in writing (including copies of all papers served with respect to
such Third Party Claim), which notice shall describe in reasonable detail the
nature of the Third Party Claim, an estimate of the amount of damages
attributable to the Third Party Claim to the extent feasible and the basis of
the Indemnified Party's request for indemnification under this Agreement;
provided that any failure to timely give such notice shall not relieve the
Indemnifying Party of any of its obligations under this Section 6 except to the
extent that such failure prejudices or impairs, in any material respect, any of
the rights or obligations of the Indemnifying Party.

                                      -29-
<PAGE>
 
     (c   Any Indemnifying Party may, and at the request of the Indemnified
Party shall, participate in and control the defense of the Third Party Claim
with counsel of its choice reasonably satisfactory to the Indemnified Party.
The Indemnified Party shall have the right to employ separate counsel in any
such action and to participate in the defense thereof, but the fees and expenses
of such counsel shall be at the expense of the Indemnified Party unless (i) the
employment thereof has been specifically authorized in writing by the
Indemnifying Party, (ii) the Indemnifying Party failed to assume the defense and
employ counsel or failed to diligently prosecute or settle the Third Party Claim
or (iii) there shall exist or develop a conflict that would ethically prohibit
counsel to the Indemnifying Party from representing the Indemnified Party.  If
requested by the Indemnifying Party, the Indemnified Party agrees to cooperate
with the Indemnifying Party and its counsel in contesting any Third Party Claim
that the Indemnifying Party elects to contest, including, without limitation, by
making any counterclaim against the person or entity asserting the Third Party
Claim or any cross-complaint against any person or entity, in each case only if
and to the extent that any such counterclaim or cross-complaint arises from the
same actions or facts giving rise to the Third Party Claim.  The Indemnifying
Party shall be the sole judge of the acceptability of any compromise or
settlement of any claim, litigation or proceeding in respect of which indemnity
may be sought hereunder, provided that the Indemnifying Party will give the
Indemnified Party reasonable prior written notice of any such proposed
settlement or compromise and will not consent to the entry of any judgment or
enter into any settlement with respect to any Third Party Claim without the
prior written consent of the Indemnified Party, which shall not be unreasonably
withheld.  The Indemnifying Party (if the Indemnified Party is entitled to
indemnification hereunder) shall reimburse the Indemnified Party for its
reasonable out of pocket costs incurred with respect to such cooperation.

     (d   If the Indemnifying Party fails to assume the defense of a Third Party
Claim within a reasonable period after receipt of written notice pursuant to the
first sentence of subparagraph (c), or if the Indemnifying Party assumes the
defense of the Indemnified Party pursuant to subparagraph (c) but fails
diligently to prosecute or settle the Third Party Claim, then the Indemnified
Party shall have the right to defend, at the sole cost and expense of the
Indemnifying Party (if the Indemnified Party is entitled to indemnification
hereunder), the Third Party Claim by all appropriate proceedings, which
proceedings shall be promptly and vigorously prosecuted by the Indemnified Party
to a final conclusion or settled.  The Indemnified Party shall have full control
of such defense and proceedings; provided that the Indemnified Party shall not
settle such Third Party Claim without the written consent of the Indemnifying
Party, which consent shall not be unreasonably withheld.  The Indemnifying Party
may participate in, but not control, any defense or settlement controlled by the
Indemnified Party pursuant to this Section, and the Indemnifying Party shall
bear its own costs and expenses with respect to such participation.

     (e   Notwithstanding the other provisions of this Section 6.3, if the
Indemnifying Party disputes its potential liability to the Indemnified Party
under this Section 6.3 and if such dispute is resolved in favor of the
Indemnifying Party, the Indemnifying Party shall not be required to bear the

                                      -30-
<PAGE>
 
costs and expenses of the Indemnified Party's defense pursuant to this Section
6.3 or of the Indemnifying Party's participation therein at the Indemnified
Party's request, and the Indemnified Party shall reimburse the Indemnifying
Party in full for all costs and expenses of the litigation concerning such
dispute.  If a dispute over potential liability is resolved in favor of the
Indemnified Party, the Indemnifying Party shall reimburse the Indemnified Party
in full for all costs of the litigation concerning such dispute.

     (f   After it has been determined, by acknowledgment, agreement, or ruling
of court of law, that an Indemnifying Party is liable to the Indemnified Party
under this Section 6, the Indemnifying Party shall pay or cause to be paid to
the Indemnified Party the amount of the Liability  within ten business days of
receipt by the Indemnifying Party of a notice reasonably itemizing the amount of
the Liability but only to the extent actually paid or suffered by the
Indemnified Party.

     (g   In the event a Third Party Claim is brought in which the liability as
between the Partnership and the Contributor is alleged to be joint (it being
agreed that any Third Party Claim related to a Pre-Closing Contingent Liability
shall be deemed joint) or in which the entitlement to indemnification under this
Section 6 has not been determined, the Partnership and the Contributor shall
cooperate in the joint defense of such Third Party Claim and shall offer to each
other such assistance as may reasonably be requested in order to ensure the
proper and adequate defense of any such matter.  Such joint defense shall be
under the general management and supervision of the party which is expected to
bear the greater share of the liability, unless otherwise agreed; provided,
however, that neither party shall settle or compromise any such joint defense
matter without the consent of the other, which consent shall not be unreasonably
withheld or delayed.  Any uninsured costs of such joint defense shall be borne
as the parties may agree, provided, however, that in the absence of such
agreement, the defense costs shall be borne by the party incurring such costs;
provided, further, that, if it is determined that one party was entitled to
indemnification under this Section 6, the other party shall reimburse the party
entitled to indemnification for all of its costs incurred in connection with
such defense.

     6.4  Subrogation.  In the event of any payment by an Indemnifying Party to
an Indemnified Party in connection with any Liability, the Indemnifying Party
shall be subrogated to and shall stand in the place of the Indemnified Party as
to any events or circumstances in respect of which the Indemnified Party may
have any right or claim against any third party relating to such event or
indemnification.  The Indemnified Party shall cooperate with the Indemnifying
Party in any reasonable manner in prosecuting any subrogated claim.

     6.5  Claims for HSE Work.  Notwithstanding the other provisions of this
Section 6, in the case of any assertion, claim or demand requiring the
performance of investigatory, removal or remedial work with respect to
(environmental conditions, HSE Laws or Chemical Substances for which the
Partnership may seek indemnification, the Partnership shall have the right to
conduct and control such work provided (i) it uses its good faith, commercially
reasonable efforts to achieve the 

                                      -31-
<PAGE>
 
Lowest Cost Response and (ii) it provides the Contributor with the opportunity
to: (A) review and comment upon any work plans for any remedial action prior to
finalization and implementation; (B) attend meetings with regulators concerning
the remedial action; and (C) have a representative present during the
performance of any remedial action.

     6.6  EXTENT OF INDEMNIFICATION.  WITHOUT LIMITING OR ENLARGING THE SCOPE OF
THE INDEMNIFICATION, RELEASE AND ASSUMPTION OBLIGATIONS SET FORTH HEREIN, TO THE
FULLEST EXTENT PERMITTED BY LAW, AN INDEMNIFIED PARTY SHALL BE ENTITLED TO
INDEMNIFICATION HEREUNDER IN ACCORDANCE WITH THE TERMS HEREOF, REGARDLESS OF
WHETHER THE INDEMNIFIABLE LOSS GIVING RISE TO ANY SUCH INDEMNIFICATION
OBLIGATION IS THE RESULT OF THE SOLE, GROSS, ACTIVE, PASSIVE, CONCURRENT OR
COMPARATIVE NEGLIGENCE, STRICT LIABILITY OR OTHER FAULT OR VIOLATION OF ANY LAW
OF OR BY ANY SUCH INDEMNIFIED PARTY.  THE PARTIES AGREE THAT THIS STATEMENT
CONSTITUTES A CONSPICUOUS LEGEND.

                                   SECTION 7
                                 MISCELLANEOUS

     7.1  Construction.  In construing this Agreement, the following principles
shall be followed:  (i) no consideration shall be given to the captions of the
articles, sections, subsections or clauses, which are inserted for convenience
in locating the provisions of this Agreement and not as an aid in construction:
(ii) no consideration shall be given to the fact or presumption that any of the
parties had a greater or lesser hand in drafting this Agreement; (iii) examples
shall not be construed to limit, expressly or by implication, the matter they
illustrate; (iv) the word "includes" and its syntactic variants mean "includes,
but is not limited to" and corresponding syntactic variant expressions; (v) the
plural shall be deemed to include the singular, and vice versa; (vi) each gender
shall be deemed to include the other gender; and (vii) each exhibit, appendix,
attachment and schedule to this Agreement is a part of this Agreement.

     7.2  Payment of Certain Expenses and Taxes.

     (a   Subject to the further provisions of this Section 7.2, the Contributor
shall be responsible for all Taxes attributable to the Contributor's ownership
or use of the Assets or operation of the Contributed Business prior to the
Closing and the Partnership shall be responsible for all Taxes attributable to
the Partnership's ownership or use of the Assets or operation of the Contributed
Business after the Closing.  The Contributor shall be responsible for any
liability of the Partnership pursuant to Texas Tax Code Section 111.020
(including interest, penalties and attorneys' fees in connection therewith) with
respect to any amounts owed or owing by the Contributor under Title 2, Texas Tax
Code.

                                      -32-
<PAGE>
 
     (b   All sales, transfer, or other similar taxes incurred in connection
with the transfer of the Assets shall be borne by the Partnership.  The
Partnership, the Contributor and the Contributing Partner shall cooperate fully
with each other after the Closing in connection with (i) the preparation and
filing of any tax return, exemption certificate, or other filing in connection
with such taxes, and (ii) any audit examination by any taxing Authority of the
tax returns, exemption certificates, or other filings referred to above.

     (c   All real property taxes, personal property taxes, ad valorem taxes,
and other similar taxes (or payments in lieu of such taxes) assessed on any of
the Assets in the tax period in which the Closing Date occurs (other than the
Inventory Taxes referred to in Section 7.2(d) below) ("Property Taxes") shall be
prorated between the Partnership and the Contributor as of the Closing.

     (d   All real property taxes, personal property taxes, ad valorem taxes,
and other similar taxes (or payments in lieu of such taxes) assessed on the
Inventory or Stores Inventory in the tax period in which the Closing Date occurs
("Inventory Tax") shall be payable by the Contributor.

     (e   The Partnership shall pay any title or recordation fees in connection
with the transfer of the Assets.  The Partnership shall also pay for any title
insurance policies or surveys of the Fee Interests that are requested or ordered
by the Partnership.

     (f   After the Closing, the Contributor receiving each Property Tax or
Inventory Tax bill or notice applicable to the Assets for the period in which
the Closing Date occurred shall promptly notify the Partnership and shall pay
each such tax bill prior to the last day such taxes may be paid without penalty
or interest.  The Partnership shall promptly on receipt of a written request
(accompanied by appropriate supporting documentation) reimburse the paying party
with respect to the Partnership's share of such amount so paid as provided under
this Agreement.  The Contributor and the Partnership shall cooperate fully with
each other on and after Closing with respect to any Property Tax assessment or
valuation (or protest in connection therewith) by any taxing Authority with
respect to the tax period in which the Closing Date occurs.

     (g   If either party receives a refund of any Taxes for which the other is
liable or responsible under this Agreement, the party receiving such refund
shall, within 30 days after the receipt of such refund, remit it to the party
who is liable.

     (h   Notwithstanding any other provision of this Agreement, the obligations
of the parties set forth in this Section 7.2 shall be unconditional and absolute
and shall remain in effect until audit, assessment and collection of any such
taxes are barred by the applicable statute of limitations.

     7.3  Notices.  All notices, requests, demands and other communications
which are required or may be given under this Agreement shall unless otherwise
provided for elsewhere in this Agreement, be in writing and shall be deemed to
have been duly given if and when (i) transmitted 

                                      -33-
<PAGE>
 
by telecopier facsimile with proof of confirmation from the transmitting
machine, or (ii) delivered by courier or other hand delivery, as follows:

     (a)  If to the Contributor:

          Lyondell Petrochemical Company
          1221 McKinney Street
          Houston, Texas 77010
          Attention: Jeffrey R. Pendergraft
          Telecopy Number: (713) 652-4538

     (b)  If to the Contributing Partner:

          Lyondell Petrochemical L.P. Inc.
          1221 McKinney Street
          Houston, Texas 77010
          Attention: Jeffrey R. Pendergraft
          Telecopy Number: (713) 652-4538

     (c)  If to the Partnership:

          Equistar Chemicals, LP
          1221 McKinney Street
          Houston, Texas 77010
          Attention: Gerald A. O'Brien
          Telecopy Number: (713) 309-4718

or to such other address or telecopy number as either party shall have specified
by notice in writing to the other party.  All such notices, requests, demands
and communications shall be deemed to be effective upon receipt.

     7.4  [Reserved].

     7.5  Binding Effect; Benefit.  Subject to Section 7.7, this Agreement shall
inure to the benefit of and be binding upon the parties hereto and their
respective permitted successors and assigns.  Nothing in this Agreement,
expressed or implied, is intended to confer on any Person other than the parties
hereto or their respective permitted successors and assigns, any rights,
remedies, obligations or liabilities under or by reason of this Agreement.

     7.6  Occasional and Bulk Sales.  To the extent applicable, the Partnership
and the Contributor each agree to waive, to the fullest extent permitted by law,
compliance by the other with the provisions of the Bulk Sales Law of any
jurisdiction.

                                      -34-
<PAGE>
 
     7.7  Assignability.  Neither this Agreement nor any of the rights or
obligations hereunder shall be assignable (by operation of law or otherwise) by
the Contributor or the Contributing Partner without the prior written consent of
the Partnership or shall be assignable (by operation of law or otherwise) by the
Partnership (except to a wholly-owned subsidiary thereof) without the prior
written consent of the Contributor.  Any assignment or purported assignment in
violation of this Section shall be null and void.

     7.8  Amendment; Waiver.  This Agreement may be amended, supplemented or
otherwise modified only by a written instrument executed by the parties hereto.
No waiver by any party of any of the provisions hereof shall be effective unless
explicitly set forth in writing and executed by the party so waiving.  Subject
to the agreements and obligations of the Partnership hereunder or under
applicable Legal Requirements, no investigations by the Partnership heretofore
or hereafter made shall affect the representations and warranties of the
Contributor, and, except as otherwise provided in Section 6.1, such
representations and warranties shall survive any such investigation.  The waiver
by any party hereto of a breach of any provision of this Agreement shall not
operate or be construed as a waiver of any subsequent breach.

     7.9  Dispute Resolution.  All disputes under this Agreement shall be
resolved in accordance with the Dispute Resolution Procedures set forth in
Appendix A.

     7.10 Severability.  In the event that any provisions of this Agreement
shall finally be determined to be unlawful, such provision shall, so long as the
economic and legal substance of the transactions contemplated hereby is not
affected in any materially adverse manner as to Contributor, the Contributing
Partner or the Partnership, be deemed severed from this Agreement and every
other provision of this Agreement shall remain in full force and effect.

     7.11 Counterparts.  This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original and all of which
together shall be deemed to be one and the same instrument.

     7.12 APPLICABLE LAW.  THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF DELAWARE EXCLUDING CONFLICTS OF LAW
PRINCIPLES OF SUCH JURISDICTION EXCEPT TO THE EXTENT SUCH MATTERS ARE
MANDATORILY SUBJECT TO THE LAWS OF ANOTHER JURISDICTION PURSUANT TO THE LAWS OF
SUCH OTHER JURISDICTION.

     7.13 JURISDICTION; CONSENT TO SERVICE OF PROCESS; WAIVER.  ANY JUDICIAL
PROCEEDING BROUGHT AGAINST ANY PARTY TO THIS AGREEMENT OR ANY DISPUTE UNDER OR
ARISING OUT OF OR IN CONNECTION WITH THIS AGREEMENT OR ANY MATTER RELATED HERETO
SHALL BE BROUGHT IN THE 

                                      -35-
<PAGE>
 
FEDERAL OR STATE COURTS OF THE STATE OF DELAWARE, AND, BY EXECUTION AND DELIVERY
OF THIS AGREEMENT, EACH OF THE PARTIES TO THIS AGREEMENT ACCEPTS THE EXCLUSIVE
JURISDICTION OF SUCH COURTS AND IRREVOCABLY AGREES TO BE BOUND BY ANY JUDGMENT
(AS FINALLY ADJUDICATED) RENDERED THEREBY IN CONNECTION WITH THIS AGREEMENT
EXCEPT TO THE EXTENT THIS AGREEMENT RELATES TO THE CONVEYANCE OR ASSIGNMENT OF
ANY INTEREST IN REAL ESTATE OR THE CREATION, PERFECTION, PRIORITY OR FORECLOSURE
OF ANY LIEN ON ANY INTEREST IN REAL ESTATE IN WHICH CASE, SUCH COURTS
JURISDICTION SHALL BE NON-EXCLUSIVE. EACH OF THE PARTIES TO THIS AGREEMENT SHALL
APPOINT THE CORPORATION TRUST COMPANY, THE PRENTICE-HALL CORPORATION SYSTEM,
INC. OR A SIMILAR ENTITY (THE "AGENT") AS AGENT TO RECEIVE ON ITS BEHALF SERVICE
OF PROCESS IN ANY PROCEEDING IN ANY SUCH COURT IN THE STATE OF DELAWARE BY
ENTERING INTO AN AGREEMENT AS OF THE DATE OF THIS AGREEMENT WITH THE AGENT TO
SUCH EFFECT. THE FOREGOING CONSENTS TO JURISDICTION AND APPOINTMENTS OF AGENT TO
RECEIVE SERVICE OF PROCESS SHALL NOT CONSTITUTE GENERAL CONSENTS TO SERVICE OF
PROCESS IN THE STATE OF DELAWARE FOR ANY PURPOSE EXCEPT AS PROVIDED ABOVE AND
SHALL NOT BE DEEMED TO CONFER RIGHTS ON ANY PERSON OTHER THAN THE PARTIES
HERETO. EACH PARTY HEREBY WAIVES ANY OBJECTION IT MAY HAVE BASED UPON LACK OF
PERSONAL JURISDICTION, IMPROPER VENUE OR FORUM NON CONVENIENS.

     7.14 WAIVER OF JURY TRIAL.  THE PARTNERSHIP, THE CONTRIBUTING PARTNER AND
THE CONTRIBUTOR HEREBY KNOWINGLY AND INTENTIONALLY, IRREVOCABLY AND
UNCONDITIONALLY WAIVE TRIAL BY JURY IN ANY LEGAL ACTION OR PROCEEDING RELATING
TO THIS AGREEMENT AND FOR ANY COUNTERCLAIM THEREIN.

                                      -36-
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement as of the date first above written.



                              LYONDELL PETROCHEMICAL COMPANY,
                              a Delaware corporation.



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


                              LYONDELL PETROCHEMICAL L.P. INC.,
                              a Delaware corporation.


                              By: /s/ Dan F. Smith
                                 ---------------------------------
                              Name:  Dan F. Smith
                              Title: President


                              EQUISTAR CHEMICALS, LP,
                              a Delaware limited partnership


                              By: /s/ Debra L. Starnes
                                 ----------------------------------
                              Name:  Debra L. Starnes
                              Title: Senior Vice President

                                      -37-
<PAGE>
 
                                   SCHEDULE A


          Lyondell will contribute to the Partnership the Contributed Business,
which consists of the production, distribution and sale of petrochemicals and
polymers.  Its facilities are located in Channelview, Matagorda County, Mont
Belvieu, Pasadena and Victoria, Texas.

          A more complete description of the businesses which are owned and
operated by Lyondell is included in Lyondell's Annual Report on Form 10-K for
the year ended December 31, 1996 and Lyondell's Quarterly Reports on Form 10-Q
for the quarters ended March 31, 1997 and June 30, 1997.


<PAGE>
 
                                Schedule 2.1(a)

                                 Fee Interests

     The following are deeds that are to be transferred to the Partnership for
Fee Interests:

BAYPORT FACILITY
9802 Fairmont Parkway
Pasadena, TX 77505
Harris County

CHANNELVIEW FACILITY
8280 Sheldon Road
Channelview, TX 77530
Harris County

MATAGORDA FACILITY
Highway 60
Bay City, TX 77414
Matagorda County
 
MONT BELVIEU FACILITY
11815 Highway 146
Mont Belvieu, TX 77580
Chambers County

<PAGE>
 
                                Schedule 2.1(b)

                                     Leases

     The following are leases that are to be assigned to the Partnership for
Leaseholds:

ALVIN FACILITY
FM 2004, P. O. Box 4000
Alvin, TX 77511
Brazoria County

CHANNELVIEW FACILITY
8280 Sheldon Road
Channelview, TX 77530
Harris County

CHICAGO FACILITY
One Pierce Place #250W
Itasca, IL 60143
Dupage County

PHILADELPHIA FACILITY
1400 Morris Drive
Wayne, PA 19087
Collin County

PLANO FACILITY
2300 W. Plano Parkway #K1106
Plano, TX
Collin County

VICTORIA FACILITY
Old Bloomington Highway
Victoria, TX 75075
Victoria County

<PAGE>
 
                                Schedule 2.1(d)

                                   Equipment


          The equipment set forth in the Equipment Listing dated July 31, 1997,
including all additions and deletions up to December 1, 1997, copies of which
have been initialed by representatives of the Contributor and the Partnership.

<PAGE>
 
                                Schedule 2.1(k)

                            Contributed Subsidiaries


     (i)    Lyondell Mont Belvieu Corporation

     (ii)   Lyondell Petrochemical de Mexico, Inc.

     (iii)  Lyondell Transportation Company

<PAGE>
 
                                Schedule 2.2(h)

                            Certain Excluded Assets


     (i) Lyondell's interest in and assets associated with the methanol business
of Lyondell Methanol Company L.P. and the related hydrogen purification and
sales; (ii) certain technology rights (ARCO Technology Licensing & Immunity From
Suit Agreements & prod flex technology (including Lyondell improvements))*;
(iii) mainframe leases (computers & equipment); (iv) mainframe owned assets
(hardware & software); (v) assets exclusively with Lyondell's ongoing corporate
operations, including equipment, records, computer hardware and software and
other personal property and fixtures; (vi) Outstanding claims related to Mt.
Belvieu valve failure in 1996 and Colonial Pipeline fire in 1995; (vii)
Lyondell's interest in the following subsidiaries: Lyondell Refining Company,
Lyondell General Methanol Company, Lyondell Limited Methanol Company, Lyondell
Petrochemical L.P., Inc., Lyondell Petrochemical G.P. Inc. and Lyondell FSC,
Inc.; and (viii) the assets of Lyondell (or its Affiliates) that are covered by
a Shared Services Agreement in which the service is to be provided by Lyondell
or its Affiliates to the Partnership.

*To be licensed to the Partnership pursuant to Master Intellectual Property
Agreement.

<PAGE>
 
                                Schedule 2.2(c)

              Excluded names, logos, tradenames, trademarks, etc.


(i)  all marks with "Lyondell", including Lyondell.com and all rights to "LYO";

(ii) Synergist Logo;

<PAGE>
 
                              Schedule 2.5(a)(vii)

                              Assumed Indebtedness
 
 
PUBLIC DEBT
- -----------
 
1989 Indenture       $150,000,000  Due June 1999
 
1992 Indenture       $100,000,000  Due March 2002
 
1996 Indenture       $150,000,000  Due February 2006
                     $150,000,000  Due February 2026
 
MEDIUM TERM NOTES
 
$195,000,000         Due Jan. 1998-March 2005

<PAGE>
 
                               Schedule 2.5(a)(x)

                         Assumed Long-term Liabilities


The following liabilities related to (i) the operations of the Contributed
Business or (ii) employees who will become employees of the Partnership:

          Post-retirement benefits other than those related to Defined Benefit
          Pension Plans and Defined Contribution Plans.

<PAGE>
 
                                   Schedule 3

                              Disclosure Schedule

     The Contributor makes no exceptions to the representations and warranties
made by it in Section 3 of this Agreement except for the following exception to
its representations made in Section 3.4 of this Agreement:

          The Contributor has received a letter from the Pension Benefit
Guaranty Corporation (the "PBGC") dated October 31, 1997 expressing a concern
that the actions contemplated by the Agreement would increase the risk to the
PBGC relating to the Lyondell Retirement Plan for Non-Represented Employees.  In
that letter, the PBGC noted that it could seek to involuntarily terminate the
Plan prior to the Closing Date if it determined that the transaction would cause
the risk to the PBGC to increase unreasonably.  The letter went on to state that
this measure would be viewed as a last resort and that the PBGC would prefer to
enter into a consensual agreement to protect the Plan.

          The Contributor has provided the PBGC with information explaining the
transaction pursuant to a Confidentiality Agreement with the PBGC.  In addition,
the Contributor has met with representatives at the PBGC regarding the
transaction and those representatives have suggested possible consensual
arrangements that could be acceptable to the PBGC in lieu of any attempt to
terminate the Plan.

<PAGE>
 
                                   Appendix A

                         Dispute Resolution Procedures


     (1) Binding and Exclusive Means.  The dispute resolution provisions set
forth in this Appendix A shall be the binding and exclusive means to resolve all
disputes arising under this Agreement (each a "Dispute").

     (2) Standards and Criteria.  In resolving any Dispute, the standards and
criteria for resolving such dispute shall, unless the Contributor and the
Partnership in their discretion jointly stipulate otherwise, be as set forth in
Appendix 1 to this Appendix A.

     (3) ADR and Binding Arbitration Procedures.  If a Dispute arises, the
following procedures shall be implemented:

     (a) The Indemnifying Party may at any time invoke the dispute resolution
procedures set forth in this Appendix A as to any Dispute by providing written
notice of such action to the Indemnified Party, who within five Business Days
after such notice shall schedule a meeting to be held in Houston, Texas between
the parties.  The meeting shall occur within 10 Business Days after notice of
the meeting is delivered to the Indemnifying Party.  The meeting shall be
attended by representatives of each party having decision-making authority
regarding the Dispute as well as the dispute resolution process and who shall
attempt in a commercially reasonable manner to negotiate a resolution of the
Dispute.

     (b) The representatives of the parties shall cooperate in a commercially
reasonable manner and shall explore whether techniques such as mediation,
minitrials, mock trials or other techniques of alternative dispute resolution
might be useful.  In the event that a technique of alternative dispute
resolution is so agreed upon, a specific timetable and completion date for its
implementation shall also be agreed upon.  The representatives will continue to
meet and discuss settlement until the date (the "Interim Decision Date") that is
the earliest to occur of the following events: (i) an agreement shall be reached
by the parties resolving the Dispute; (ii) one of the parties shall determine
and notify the other party in writing that no agreement resolving the Dispute is
likely to be reached; (iii) if a technique of alternative dispute resolution is
agreed upon, the completion date therefor shall occur without the parties having
resolved the Dispute; or (iv) if another technique of alternative dispute
resolution is not agreed upon, two full meeting days (or such other time period
as may be agreed upon) shall expire without the parties having resolved the
Dispute.

     (c) If, as of the Interim Decision Date, the parties have not succeeded in
negotiating a resolution of the dispute pursuant to subsection (b), the parties
shall proceed under subsection (d).

<PAGE>
 
     (d) The parties shall jointly appoint a Neutral.  If the parties have been
unable to agree upon such appointment within 30 days after the Interim Decision
Date, then such Neutral, upon the application of either of the parties shall be
appointed within 10 days of the filing of such application by the Center for
Public Resources, or if such appointment is not so made promptly then promptly
thereafter by the American Arbitration Association in Philadelphia,
Pennsylvania, or if such appointment is not so made promptly then promptly
thereafter by the senior United States District Court judge sitting in
Wilmington, Delaware.  The fees of the Neutral shall be paid equally by the
parties except that the Neutral shall have discretion to award fees.

     (e) In consultation with the Neutral, the parties shall agree upon a
binding schedule and procedure (which procedure may have been previously
discussed under subsection (b)) to be used as a means to resolve or to attempt
to resolve Dispute, with the Neutral making the decision as to the schedule
and/or procedure if the parties have been unable to agree on any of such matters
within 20 days after the initial selection of the Neutral.  The parties agree to
participate in a commercially reasonable manner in the procedure to its
conclusion as determined by the Neutral.  If the parties are not successful in
resolving the Dispute through the procedure described above, then the parties
agree that (i) the Neutral shall act as the arbitrator in a binding arbitration
in accordance with the American Arbitration Association rules and shall render a
decision and (ii) judgment upon the decision rendered by the Neutral may be
entered in any court having jurisdiction.

     (4) Continuation of Business.  Notwithstanding the existence of any Dispute
or the pendency of any procedures pursuant to this Appendix A, the parties agree
and undertake that all payments not in dispute shall continue to be made and all
obligations not in dispute shall continue to be performed.

<PAGE>
 
                                   Appendix 1


     (a) First priority shall be given to maximizing the consistency of the
resolution of the Dispute with the satisfaction of all express obligations of
the parties and their Affiliates as set forth in the Agreement.

     (b) Second priority shall be given to resolution of the Dispute in a manner
which best achieves the objectives of the business activities and arrangements
under the Agreement and permits the parties to realize the benefits intended to
be afforded thereby.

     (c) Third priority shall be given to such other matters, if any, as the
parties or the Neutral shall determine to be appropriate under the
circumstances.


<PAGE>
 
                                                                   EXHIBIT 10.26
                                                                  CONFORMED COPY


                         ASSET CONTRIBUTION AGREEMENT


                                    BETWEEN


                        MILLENNIUM PETROCHEMICALS INC.,


                       MILLENNIUM PETROCHEMICALS LP LLC


                                      AND


                            EQUISTAR CHEMICALS, LP



                           DATED:  DECEMBER 1, 1997
<PAGE>
 
                               TABLE OF CONTENTS


 
                                                                            PAGE

SECTION 1  DEFINITIONS......................................................   1
 
SECTION 2  CONTRIBUTION OF ASSETS; ASSUMPTION OF CERTAIN LIABILITIES........   8
    2.1    Transfer of Assets...............................................   8
    2.2    Excluded Assets..................................................  10
    2.3    Instruments of Conveyance and Assignment.........................  11
    2.4    Further Assurances...............................................  11
    2.5    Assumption of Liabilities........................................  12
    2.6    Excluded Liabilities.............................................  13
    2.7    Master Intellectual Property Agreement...........................  14
    2.8    Employee Matters.................................................  14
    2.9    Joint Contracts..................................................  16
 
SECTION 3  REPRESENTATIONS AND WARRANTIES OF THE CONTRIBUTOR................  17
    3.1    Due Organization; Good Standing and Power........................  17
    3.2    Authorization and Validity of Agreements.........................  17
    3.3    No Consents Required; No Conflict with Instruments to which the
           Contributor is a Party.........................................    17
    3.4    Employee Benefits................................................  18
    3.5    Title to Assets; Absence of Liens and Encumbrances; Leases.......  19
    3.6    Title Matters; Defects in Improvements...........................  20
    3.7    Working Capital..................................................  20
    3.8    Technology and Similar Rights....................................  20
    3.9    Government Licenses, Permits and Related Approvals...............  20
    3.10   All Necessary Assets.............................................  20
    3.11   Conduct of Business in Compliance with Regulatory and
           Contractual Requirements.........................................  21
    3.12   Legal Proceedings................................................  21
    3.13   Consents.........................................................  21
    3.14   Tax Matters......................................................  21
    3.15   [Reserved].......................................................  21
    3.16   HSE Matters......................................................  21
    3.17   Investigation to Acquire Knowledge...............................  22
 
SECTION 4  REPRESENTATIONS AND WARRANTIES OF THE PARTNERSHIP................  22
    4.1    Due Organization; Good Standing and Power........................  22
    4.2    Authorization and Validity of Agreement..........................  23
    4.3    No Consents Required; No Conflict with Instruments to which the
           Partnership is a Party...........................................  23


                                     -i- 
<PAGE>
 
SECTION 5  COVENANTS SUBSEQUENT TO CLOSING DATE.............................  23
    5.1    Access to Information............................................  23
    5.2    Mail or Other Communications.....................................  24
    5.3    Use of Contributor's Trade Name..................................  24
    5.4    Closing Date Balance Sheet.......................................  24
    5.5    Payment of Retained Accounts Payable.............................  24
    5.6    Collection of Accounts Receivable................................  24
    5.7    Reimbursement for Prepaid Expenses...............................  25
 
SECTION 6  SURVIVAL AND INDEMNIFICATION.....................................  25
    6.1    Survival Limitations.............................................  25
    6.2    Indemnification..................................................  25
    6.3    Procedures.......................................................  28
    6.4    Subrogation......................................................  30
    6.5    Claims for HSE Work..............................................  30
    6.6    EXTENT OF INDEMNIFICATION........................................  31
 
SECTION 7  MISCELLANEOUS....................................................  31
    7.1    Construction.....................................................  31
    7.2    Payment of Certain Expenses and Taxes............................  31
    7.3    Notices..........................................................  32
    7.4    [Reserved].......................................................  33
    7.5    Binding Effect; Benefit..........................................  33
    7.6    Occasional and Bulk Sales........................................  33
    7.7    Assignability....................................................  34
    7.8    Amendment; Waiver................................................  34
    7.9    Dispute Resolution...............................................  34
    7.10   Severability.....................................................  34
    7.11   Counterparts.....................................................  34
    7.12   APPLICABLE LAW...................................................  34
    7.13   JURISDICTION; CONSENT TO SERVICE OF PROCESS; WAIVER..............  34
    7.14   WAIVER OF JURY TRIAL.............................................  35


                                     -ii-
<PAGE>
 
                  LIST OF SCHEDULES AND EXHIBITS TO AGREEMENT

                                   Schedules
 
Schedule A            -     Contributed Business
Schedule 2.1(a)       -     Fee Interests
Schedule 2.1(b)       -     Leases
Schedule 2.1(d)       -     Equipment
Schedule 2.1(k)       -     Contributed Subsidiaries
Schedule 2.2(c)       -     Excluded Tradenames and Logos
Schedule 2.2(h)       -     Certain Excluded Assets
Schedule 2.5(a)(vii)  -     Assumed Indebtedness
Schedule 2.5(a)(x)    -     Assumed Long-Term Liabilities
Schedule 3            -     Disclosure Schedule
 

                                  Appendices

Appendix A            -     Dispute Resolution Procedures


                                   Exhibits
 
Exhibit A             -     Form of Deeds for Fee Interests
Exhibit B             -     Form of Assignment of Lease for Leaseholds
Exhibit C             -     Form of Bill of Sale and Assignment
Exhibit D             -     Form of Trademark Assignment
Exhibit E             -     Form of Patent Assignment
Exhibit F             -     Form of Assumption Agreement
Exhibit G             -     Form of Master Intellectual Property Agreement
 


                                     -iii-
<PAGE>
 
                         ASSET CONTRIBUTION AGREEMENT



     ASSET CONTRIBUTION AGREEMENT (this "Agreement"), dated as of December 1,
1997, between Millennium Petrochemicals Inc., a Virginia corporation (the
 "Contributor"),  Millennium Petrochemicals LP LLC, a Delaware limited liability
company (the "Contributing Partner") and Equistar Chemicals, LP, a Delaware
limited partnership (the "Partnership").

     WHEREAS,  the Contributor owns all of the issued and outstanding shares of
capital stock of Contributing Partner and the Contributing Partner is a partner
in the Partnership;

     WHEREAS, the Contributor wishes to contribute the assets subject to certain
liabilities associated with the olefins, polyolefins and related petrochemicals
businesses described in Schedule A (the "Contributed Business") to the
Contributing Partner; and

     WHEREAS, the Contributing Partner wishes to contribute such assets and
liabilities to the Partnership, and the Partnership wishes to accept such assets
and assume such liabilities, all upon the terms and conditions hereinafter set
forth; and

     WHEREAS, the Partnership will consummate certain transactions and enter
into certain agreements as provided for in the Master Transaction Agreement,
dated as of July 25, 1997, between Lyondell Petrochemical Company and Millennium
Chemicals Inc., as amended (the "Master Transaction Agreement").

     NOW THEREFORE, in consideration of the premises and of the mutual covenants
of the parties hereto, it is hereby agreed as follows:


                                   SECTION 1
                                  DEFINITIONS

     The terms used in this Agreement have the following definitions or are
defined in the Sections referenced below:

     "Accounts Receivable" constitute, as of the Closing Date, all uncollected
accounts receivable that have been generated by, or are attributable to, the
Contributor's operation prior to the Closing Date of the Contributed Business in
the ordinary course and in all respects in a manner consistent with the
provisions of Section 3.2 of the Master Transaction Agreement.

     "Affiliate" means any Person that directly or indirectly through one or
more intermediaries, controls or is controlled by or is under common control
with the Person specified; provided, however, that for purposes of this
Agreement (i) Suburban Propane Partners, L.P. and any Persons 
<PAGE>
 
controlled by it shall not be considered an Affiliate of Contributor; and (ii)
neither the Partnership nor any Person controlled by it shall be considered an
Affiliate of the Contributor. For purposes of this definition, the term
"control" shall have the meaning set forth in 17 CFR 230.405 as in effect on the
date hereof.

     "Agreed Rate" means the base commercial lending rate announced by Citibank,
N.A. (or its successor) at its principal office in effect from time to time,
such interest rate to change automatically, effective as of the date of each
change in such base rate.

     "Agreement" is defined in the Preamble.

     "Assets" means all of the assets, rights and properties being contributed,
conveyed, assigned, transferred and delivered to the Partnership pursuant to
Section 2.1.

     "Assignment and Assumption Agreements" means the Deeds, the Assignments of
Lease, the Bill of Sale and Assignment, the Trademark Assignment, the Patent
Assignment and the Assumption Agreement.

     "Assignments of Lease" is defined in Section 2.3(a).

     "Associated Rights" is defined in Section 2.1(c).

     "Assumed Liabilities" is defined in Section 2.5(a).

     "Assumed Plan" means the Pension Plan for Eligible Hourly Represented
Employees of Quantum Chemical Corporation.

     "Authority" means any government or governmental or regulatory body
thereof, or political subdivision thereof, whether federal (or any commonwealth,
territory or possession thereof), state, local or foreign, or any agency,
department or instrumentality thereof, or any court or arbitrator (public or
private).

     "Basic Severance" is defined in Section 2.8(b).

     "Capital Spares" means the inventory of spare parts used by the Contributor
in the Contributed Business and owned by the Contributor as of the Closing Date.

     "CERCLA" is defined in Section 3.16(b).

     "Chemical Substance" means any (i) chemical substance, pollutant,
contaminant, constituent, chemical, mixture, raw material, intermediate, product
or byproduct that is regulated (including any requirement for the reporting of
any Release thereof) under any HSE Law or defined or listed as an industrial,
toxic, deleterious, harmful, radioactive, infectious, disease-causing or
hazardous 

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substance, material or waste under any HSE Law, and (ii) petroleum or
any fraction thereof, asbestos or asbestos-containing material or
polychlorinated biphenyls ("PCBs").

     "Closing" means the closing of the transactions contemplated by the Master
Transaction Agreement.

     "Closing Date" means the date hereof.

     "Closing Date Balance Sheet" is defined in Section 5.4.

     "Code" means the Internal Revenue Code of 1986, as amended.

     "Confirmed Accounts Receivable" is defined in Section 5.6.

     "Consent" means any consent, waiver, appraisal, authorization, exception,
registration, license or declaration of or by any Person or any Authority, or
any expiration or termination of any applicable waiting period under any Legal
Requirement, required with respect to the Contributed Business or the
Contributor or any Affiliate thereof in connection with (i) the execution and
delivery of this Agreement or any of the Related Agreements or (ii) the
consummation of the transactions contemplated hereby or thereby.

     "Contracts" means contracts, maintenance and service agreements, purchase
commitments for materials and other services, advertising and promotional
agreements, leases, taxation agreements with any Authority, and other
agreements.

     "Contributed Contracts" is defined in Section 2.1(f).

     "Contributed Business" is defined in the Preamble.

     "Contributed Intellectual Property" is defined in Section 2.1(g).

     "Contributed Subsidiaries" is defined in Section 2.1(k).

     "Contributor" is defined in the Preamble.

     "Deeds" is defined in Section 2.3(a).

     "De Minimis Claim" means any Third Party Claim for which the Liability
associated therewith is less than $25,000.

     "Employee Plan" is defined in Section 3.4(a)(i).

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<PAGE>
 
     "Encumbrance" means any lien, charge, encumbrance, security interest, title
defect, option or any other restriction or third party right.

     "Environment" is defined in this Section 1 in the definition of "HSE Laws".

     "Equipment" is defined in Section 2.1(d).

     "Excluded Assets" is defined in Section 2.2.

     "Excluded Liabilities" is defined in Section 2.6.

     "Fee Interests" is defined in Section 2.1(a).

     "GAAP" means United States generally accepted accounting principles, as in
effect from time to time.

     "Government Licenses" means all licenses, permits or franchises issued by
any Authority relating to the operation, development, use, maintenance or
occupancy of the Facilities or any other Asset or of the Contributed Business to
extent that such licenses, permits or franchises relate principally to the
normal operation and conduct of the Contributed Business.

     "HSE Claim" means (i) any actions, events, circumstances or
responsibilities (including compliance actions or requirements) that are
necessary to comply with HSE Laws but only to the extent that any of the
foregoing give rise to out of pocket costs or expenses or result in a Liability
that is required by GAAP to be reflected on the balance sheet of the applicable
party or (ii) any third party (including private parties, Authorities and
employees acting on each such party's own behalf or on the behalf of other third
parties) actions, lawsuits, claims, investigations or proceedings arising under
HSE Laws.

     "HSE Laws" means any Legal Requirements or rule of common law now in effect
(including any amendments now in effect) and any current judicial or
administrative interpretation thereof, including any judicial or administrative
order, consent decree, or judgment, relating to (i) any ambient air, surface
water, drinking water, groundwater, land surface, subsurface strata, river
sediment, natural resources or real property and the physical buildings,
structures and fixtures thereon, including sewer, septic and waste treatment,
storage or disposal systems (the "Environment"), including pollution,
contamination, cleanup, preservation, protection and reclamation of the
Environment; (ii) health or safety, including the exposure of employees and
other Persons to any Chemical Substance; (iii) the Release or threatened Release
of any Chemical Substance, noxious noise or odor, including investigation,
study, assessment, testing, monitoring, containment, removal, remediation,
response, cleanup and abatement of such Release or threatened Release; and (iv)
the management of any Chemical Substance, including the manufacture, generation,
formulation, processing, labeling, use, treatment, handling, storage, disposal,
transportation, distribution, re-use, recycling or reclamation of any Chemical
Substance.

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<PAGE>
 
     "HSE Proceeding" is defined in Section 3.16(d).

     "Indemnified Party" is defined in Section 6.3(a).

     "Indemnifying Party" is defined in Section 6.3(a).

     "Intellectual Property" means research material, technical information,
marketing information, patent rights, patent licenses, pending patent
applications, trade secrets, technical information, know-how, management
information systems, technology, quality control data, specifications, designs,
drawings, software, sales promotion literature and advertising materials.

     "Inventory" means materials used by the Contributor in the Contributed
Business and owned by the Contributor as of the Closing Date including raw
materials, feed stocks, supplies, additives, pigments, process chemicals,
packaging materials (to the extent the Partnership's use thereof would be
consistent with Section 5.3), catalysts, work-in-process and finished goods that
relate principally to the normal operation and conduct of the Contributed
Business.

     "Inventory Tax" is defined in Section 7.2(d).

     "Knowledge" with respect to the Contributor means the actual knowledge of
(i) any plant manager, (ii) any officer of the Contributor having
responsibilities with respect to the Contributed Business, and (iii) any
employee reporting directly to an officer described in clause (ii), in each case
employed by the Contributor in connection with the Contributed Business.

     "Leased Premises" is defined in Section 2.1(b).

     "Leaseholds" is defined in Section 2.1(b).

     "Leases" is defined in Section 2.1(b).

     "Legal Requirement" means any law, statute, rule, ordinance, decree,
requirement, regulation, order or judgment of any Authority, including the terms
of any Government License.

     "Liability" is defined in Section 6.2(a).

     "Licensed Technology" means the technology licensed to the Partnership
pursuant to the Master Intellectual Property Agreement.

     "Licensed Trademarks" means the trademarks licensed to the Partnership
pursuant to the Master Intellectual Property Agreement.

     "Lowest Cost Response" means the response required or allowed under HSE
Laws that addresses the Chemical Substances present at the lowest cost
(considered as a whole taking into 

                                      -5-
<PAGE>
 
consideration any negative impact such response may have on the conduct of the
Contributed Business and any potential additional costs or liabilities that may
arise as a result of such response) as compared to any other response that is
consistent with HSE Laws. Taking no action shall constitute the Lowest Cost
Response if, after investigation, taking no action is determined to be
consistent with HSE Laws. If taking no action is not consistent with HSE Laws,
the least costly non-permanent remedy (such as mechanisms to contain or
stabilize Chemical Substances, including caps, dikes, encapsulation, leachate
collection systems, etc.) shall be the Lowest Cost Response, provided that such
non-permanent remedy is consistent with HSE Laws and less costly than the least
costly permanent remedy (such as the excavation and removal of soil).

     "Master Intellectual Property Agreement" is defined in Section 2.7.

     "Master Transaction Agreement" is defined in the fourth WHEREAS clause.

     "Material Adverse Effect" means any adverse circumstance or consequence
that, individually or in the aggregate, has an effect that is material to the
financial condition, results of operations, assets or business of the
Contributed Business or the Assets, taken as a whole.

     "Neutral" means a neutral Person acceptable to each of the appointing
parties and not affiliated with any of the parties or their Affiliates.

     "Partnership" is defined in the Preamble.

     "Partnership Employees" is defined in Section 2.8(a).

     "Patent Assignment" is defined in Section 2.3(a).

     "PCBs" is defined in this Section in the definition of "Chemical
Substance".

     "Person" means any natural person or any corporation, partnership, limited
liability company, joint venture, association, trust or other entity or
organization.

     "Pre-Closing Contingent Liabilities" means all Liabilities of every kind
and nature arising out of, in connection with or related to the ownership,
operation or use prior to the Closing Date of the Assets or the Contributed
Business other than the Liabilities referred to in Sections 2.5(a)(i), (ii),
(iii),  (vii), (viii) and (ix).

     "Prepaid Expenses" means the balances in the prepaid accounts consistent
with GAAP of the Contributor or its Affiliates, as of the Closing Date, that are
associated with the Contributed Business and that will have value to the
Partnership in owning and operating the Contributed Business after the Closing
Date.

     "Property Tax" is defined in Section 7.2(c).

                                      -6-
<PAGE>
 
     "Related Agreements" means the Master Transaction Agreement, Tier 1 Related
Agreements (other than this Agreement) and Tier 2 Related Agreements of the
Contributor or its Affiliates, as such terms are defined in the Master
Transaction Agreement.

     "Release" means any release, spill, emission, leaking, pumping, injection,
deposit, disposal, dumping, discharge, dispersal, leaching, escaping, emanation
or migration of any Chemical Substance in, into or onto the Environment of any
kind whatsoever, including the movement of any Chemical Substance through or in
the Environment, exposure of any type in any workplace, any release as defined
under the Comprehensive Environmental Response, Compensation and Liability Act
of 1980, as amended, or any other HSE Law and any noxious noise or odor
emission.

     "Retained Accounts Payable" means, as of the Closing Date, all current
trade accounts payable and current accrued expenses other than those related to
(A) employee vacation accruals for employees that become Partnership Employees
and (B) the current portion of the deferred maintenance.

     "SEC Reports" means the 1996 Annual Report on Form 10-K and the 10-Q for
the first quarter of 1997 of the Contributor's parent company required to be
filed with the Securities and Exchange Commission.

     "Seven Year PCCL Claims" means Third Party Claims (other than any De
Minimis Claim) related to Pre-Closing Contingent Liabilities that have been or
are asserted within seven years after the Closing Date.

     "Shared Services Agreements" means the agreements between the Contributor
(or its Affiliates) and the Partnership set forth on Appendix B-2 of the Master
Transaction Agreement.

     "Stores Inventory" means the inventory of spare parts, excluding Capital
Spares, that are used by the Contributor or any Affiliate thereof in the
Contributed Business and owned by the Contributor or any Affiliate thereof as of
the Closing Date  and that consist of items that generally can be used for
several processes or types of equipment, including, but not limited to, such
items as pumps, motors, pipe fittings, electrical wiring, instruments, nuts and
bolts, unfabricated metals, safety items, small hand tools and other
miscellaneous repair parts or supplies.

     "Taxes" means all taxes, charges, fees, levies or other assessments imposed
by any taxing Authority, including, but not limited to, income, gross receipts,
excise, property, sales, use, transfer, payroll, license, ad valorem, value
added, withholding, social security, national insurance (or other similar
contributions or payments), franchise, severance and stamp taxes (including any
interest, fines, penalties or additions attributable to, or imposed on or with
respect to, any such taxes, charges, fees, levies or other assessments).

                                      -7-
<PAGE>
 
     "Third Party Claim" means any allegation, claim, civil or criminal action,
proceeding, charge or prosecution brought by a Person other than the
Contributor, any Affiliate thereof, the Partnership, or any member of the
Lyondell Group (as defined in the Master Transaction Agreement).

     "Trademarks" means trade names, trademarks, trademark registrations or
trademark applications, copyrights, copyright applications or copyright
registrations or any derivative thereof or design used in connection therewith.

     "Trademark Assignment" is defined in Section 2.3(a).

     "Unrecorded Assets" is defined in Section 2.1(e).

     "WARN" is defined in Section 2.8(f).


                                   SECTION 2
           CONTRIBUTION OF ASSETS; ASSUMPTION OF CERTAIN LIABILITIES

     2.1   Transfer of Assets.  On the terms and subject to the conditions set
forth in this Agreement, on the date hereof, the Contributor contributes to the
Contributing Partner and the Contributing Partner is contributing, conveying,
assigning, transferring and delivering to the Partnership, or shall cause to be
contributed, conveyed, assigned, transferred and delivered to the Partnership,
and the Partnership shall accept, acquire and assume all of the assets, rights,
and properties used or held for use in the contemplated operation and conduct of
the Contributed Business of every kind, nature, character and description,
tangible and intangible, real, personal or mixed, wherever located other than
the Excluded Assets; and which conveyance, subject to Section 2.2, shall
include, without limitation, the following:

     (a)   All right, title and interest of the Contributor and any Affiliate
thereof in the parcels of land described as fee property on Schedule 2.1(a),
together with all buildings, structures, fixtures and other improvements
situated thereon and all right, title and interest of the Contributor and any
Affiliate thereof under easements, privileges, rights-of-way, riparian and other
water rights, lands underlying any adjacent streets or roads, appurtenances and
licenses to the extent pertaining to or accruing to the benefit of the land (the
"Fee Interests");

     (b)   All right, title  and interest of the Contributor and any Affiliate
thereof under the leases and subleases, all amendments thereto and all
agreements related thereto described on Schedule 2.1(b) (the "Leases"), for the
use and occupancy of the premises described therein (the "Leased Premises"),
together with all buildings, structures, fixtures and other improvements
situated thereon and, all rights and interests of the Contributor and any
Affiliate thereof under all easements, privileges, rights-of-way, riparian and
other water rights, appurtenances and licenses pertaining to the Leases or
accruing to the benefit of the tenant under the Leases (the "Leaseholds");

                                      -8-
<PAGE>
 
     (c)   All right, title and interest of the Contributor and any Affiliate
thereof, if any, in lands, or real property of others, used principally in the
normal operation and conduct of the Contributed Business (the "Associated
Rights"), including, without limitation, all contracts, easements, rights-of-
way, permits, licenses and leases and other similar rights for related
equipment, power and communications cables, and other related property and
equipment used principally in the normal operation and conduct of the
Contributed Business;

     (d)   All of the right, title and interest of the Contributor and any
Affiliate thereof in and to the equipment, furniture, furnishings, fixtures,
machinery, Capital Spares, vehicles, tools, computers and other tangible
personal property used principally in the  normal operation and conduct of the
Contributed Business including without limitation the items listed on Schedule
2.1(d), (the equipment described in this Section 2.1(d), to be referred to
collectively as the "Equipment") and all warranties and guarantees, if any,
express or implied, existing for the benefit of the Contributor or any Affiliate
thereof in connection with the Equipment to the extent assignable;

     (e)   Subject, to the extent applicable, to Section 5.3, all (i) customer
lists, customer credit information (to the extent neither the Contributor nor
any Affiliate thereof is bound to any confidentiality obligation with respect
thereto), customer payment histories and credit limits, vendor lists, catalogs,
and (ii) Intellectual Property to the extent used or contemplated for use
principally in the normal operation and conduct of  (or to the extent under
development for use principally in the normal operation and conduct of) or the
marketing or promotion of, the Contributed Business (collectively, the
"Unrecorded Assets");

     (f)   All Contracts, whether or not entered into in the ordinary course of
business, that relate principally to the normal operation and conduct of the
Contributed Business, or in the case of any Contracts under which either the
Contributor or any Affiliate thereof  retains rights with respect to its other
businesses, to the extent any such Contract relates to the operation of the
Contributed Business (all the foregoing excluding Government Licenses, but,
together with all agreements and instruments setting forth the Contributor's and
any of its Affiliates' rights with respect to rights-of-way, privileges,
riparian and other rights, appurtenances, licenses or franchises and in respect
of intellectual property rights, in each case that constitute Assets described
in clauses (a) through (e), of this Section 2.1 to be referred to collectively
as the "Contributed Contracts");

     (g)   Any Trademarks to the extent used or contemplated to be used
principally in the normal operation and conduct of the Contributed Business (all
of the items referred to in this Section 2.1(g), together with the items
referred to in clause (ii) of Section 2.1(e), collectively the "Contributed
Intellectual Property");

     (h)   All Government Licenses that are transferable and as to which
Consents to transfer are obtained where required;

     (i)   The Inventory, Stores Inventory and Prepaid Expenses;

                                      -9-
<PAGE>
 
     (j)   [Reserved]

     (k)   All right, title and interest of the Contributor and any Affiliate
thereof in the subsidiaries listed on Schedule 2.1(k) (the "Contributed
Subsidiaries");

     (l)   All claims and rights against third parties (including, without
limitation, insurance carriers, indemnitors, suppliers and service providers) to
the extent, but only to the extent that, they relate to the Assumed Liabilities;
provided, however, that to the extent that any claims or rights of the
Contributor against any third parties are not assigned to the Partnership, and
the partnership incurs Liabilities that would create such claims or rights on
behalf of the Contributor, the Contributor shall enforce such claims or rights
for the benefit (and at the cost) of the Partnership to the extent it may
lawfully do so; and

     (m)   Any other asset of the Contributor or its Affiliate contributed to
the Partnership pursuant to the terms of this Agreement.

     2.2   Excluded Assets.  It is expressly understood and agreed that the
Assets shall not include the following (the "Excluded Assets"):

     (a)   Except as otherwise provided in Section 2.1(j), cash and cash
equivalents or similar type investments, such as certificates of deposit,
Treasury bills and other marketable securities;

     (b)   Except for the Assumed Plan transferred as provided under Section
2.8(g) or as may be agreed pursuant to Section 2.8(g), any  assets of any
qualified or non-qualified pension or welfare plans or other deferred
compensation arrangements maintained by the Contributor or any Affiliate thereof
for employees of the Contributor or any Affiliate thereof prior to the Closing
Date;

     (c)   Any of the Contributor's or any Affiliate's right, title and interest
in and to (i) the names and logos set forth on Schedule 2.2(c) and any other
statutory names, trade names or trademarks, indications or descriptions of which
such names or any name similar thereto forms a part and (ii) any other trade
names, trademarks, trademark registrations or trademark applications,
copyrights, copyright applications or copyright registrations or any derivative
thereof or design used in connection therewith that are not used principally in
the normal operation and conduct of and are not uniquely applicable to the
Contributed Business;

     (d)   All claims and rights against third parties (including, without
limitation, insurance carriers, indemnitors, suppliers and service providers),
to the extent they do not relate to the Assumed Liabilities;

     (e)   Claims for refunds of Taxes for time periods ending on or before the
Closing Date, which Taxes remain the liability of Contributor under this
Agreement;

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<PAGE>
 
     (f)   Subject to the Master Intellectual Property Agreement, any and all of
the Intellectual Property and Trademarks of the Contributor or any Affiliate
thereof to the extent not used principally in the normal operation and conduct
of or to the extent not applicable to the Contributed Business;

     (g)   All items sold in the ordinary course of business prior to the
Closing Date, none of which individually or in the aggregate are material to the
normal operation and conduct of the Contributed Business; and

     (h)   The tangible assets, intangible assets, real properties, contracts
and rights, described in Schedule 2.2(h).

     2.3   Instruments of Conveyance and Assignment.  On the Closing Date,  the
Contributor shall:

     (a)   deliver or cause to be delivered to the Partnership (i) properly
executed and acknowledged warranty deeds, in substantially the form attached
hereto as Exhibit A (the "Deeds"), for all Fee Interests being conveyed
hereunder, (ii) assignments of lease for the Leases in substantially the form
attached hereto as Exhibit B, (the "Assignments of Lease"), (iii) a bill of sale
and assignment in substantially the form attached hereto as Exhibit C (the "Bill
of Sale and Assignment") conveying title to the Assets (other than the Fee
Interests and Leaseholds) and assigning the Contracts, (iv) an assignment of the
trademarks included in the Assets in substantially the form attached hereto as
Exhibit D (the "Trademark Assignment") and (v) an assignment of patent rights,
licenses and applications included in the Assets in substantially the form
attached hereto as Exhibit E (the "Patent Assignment"); and

     (b)   transfer to the Partnership the originals (to the extent the
Contributor or any Affiliate thereof possesses an original and retained no
rights thereunder after the Closing Date) or copies, as appropriate, of the
Contributed Contracts and the originals or copies, as appropriate, of all
current records, files and other data that relate to the Assets and that are
necessary for continuing the normal operation and conduct of the Contributed
Business by the Partnership.

     2.4   Further Assurances.

     (a)   On and from time to time after the Closing Date, the Contributor will
execute and deliver, or cause to be executed and delivered, such other
instruments of conveyance, assignment, transfer and delivery as the Partnership
may reasonably request in order to fulfill and implement the terms of this
Agreement, to vest in the Partnership title to the Assets, or to enable the
Partnership to realize the benefits intended to be afforded hereby.

     (b)   On and from time to time after the Closing Date, the Partnership will
execute and deliver, or cause to be executed and delivered, such other
instruments of assumption, conveyance, assignment, transfer, power of attorney
or assurance as the Contributor may reasonably request 

                                      -11-
<PAGE>
 
in order to vest in the Partnership all of the Assumed Liabilities and to enable
the Contributor to realize the benefits intended to be afforded hereby.

     (c)   Notwithstanding any other provision of this Agreement to the
contrary, the Partnership and the Contributor acknowledge and agree that any
Government Licenses, Contributed Contracts or warranties which by their terms
require Consent from any other unaffiliated contracting party thereto shall not
be assigned to the Partnership unless any such Consent has been obtained prior
to the Closing Date. Following the Closing, the Partnership and the Contributor
shall cooperate with each other and use commercially reasonable efforts to
obtain those Consents that were not obtained prior to the Closing and (i) if
such Consents are obtained following the Closing, the Partnership and the
Contributor shall execute and deliver any other and further instruments of
assignment, assumption, transfer and conveyance and take such other and further
action as the Partnership may request in order to assign to the Partnership any
Government Licenses, Contributed Contracts or warranties to which such Consents
relate and (ii) pending such transfer or issuance to the Partnership, shall
provide, to the extent it may lawfully do so, the Partnership with the benefits
of any such Government Licenses, Contributed Contracts or warranties, in which
case, the Partnership shall promptly assume and discharge (or reimburse the
Contributor or its Affiliate for) all obligations and liabilities associated
with the benefits of such Government Licenses, Contributed Contracts or
warranties so made available to the Partnership. If the Contributor obtains a
Consent to assign any Government Licenses, Contributed Contract or warranties
after the Closing, each such Government Licenses, Contributed Contract or
warranties shall be deemed to be assigned to the Partnership promptly after such
Consent is obtained.

     (d)   Following the Closing, the Contributor, Contributing Partner and the
Partnership shall cooperate in good faith and in a commercially reasonable
manner with respect to all matters pertinent to the carrying into effect of this
Agreement and the discharge by each party of its obligations and liabilities
hereunder and thereunder, and shall furnish to each other such information,
cooperation and assistance as reasonably may be requested in connection with the
foregoing.

     2.5   Assumption of Liabilities.

     (a)   On the terms and subject to the conditions, including Section 6.2,
set forth in this Agreement, on the Closing Date, the debts, liabilities and
obligations of the Contributor and its Contributed Subsidiaries set forth in
this Section 2.5 shall be assumed by the Contributing Partner in connection with
the transfer of Assets to it and shall be assumed by the Partnership in
connection with the transfer of Assets to it, and the Partnership agrees to pay,
perform and discharge all such debts, liabilities and obligations when due:

           (i)   All obligations arising after the Closing Date under the
     Contracts and Leases that are assigned to the Partnership hereunder unless
     and to the extent that such obligation arises out of a violation of such
     Contract or Lease prior to the Closing Date;

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<PAGE>
 
           (ii)  All obligations under purchase orders accepted by the
     Contributor or its Contributed Subsidiaries in the ordinary course of
     business of the Contributed Business prior to the Closing Date that are not
     filled as of the Closing Date;

           (iii) Current accrued expenses related to (A) employee vacation
     accruals for employees that become Partnership Employees and (B) the
     current portion of the deferred maintenance;

           (iv)  All obligations and liabilities, of every kind and nature,
     without limitation, arising out of, in connection with or related to the
     ownership, operation or use after the Closing Date of the Assets or the
     Contributed Business;

           (v)   Seven Year PCCL Claims to the extent the aggregate thereof does
     not exceed $7,000,000;

           (vi)  Third Party Claims that are related to Pre-Closing Contingent
     Liabilities and that are first asserted seven years or more after the
     Closing Date;

           (vii) The obligations for indebtedness described on Schedule
     2.5(a)(vii);

           (viii)Subject to Section 2.8(g), all Liabilities associated with the
     Assumed Plan;

           (ix)  All Liabilities associated with products sold after the Closing
     Date regardless of when manufactured;

           (x)   The long-term liabilities set forth on Schedule 2.5(a)(x); and

           (xi)  Any other Liability specifically assumed by the Partnership
     pursuant to the terms of this Agreement.

The liabilities and obligations assumed by the Partnership pursuant to this
Section are sometimes hereinafter referred to collectively as the "Assumed
Liabilities."

     (b)   On the Closing Date, the Partnership shall deliver to the Contributor
an instrument of assumption of the Assumed Liabilities substantially in the form
attached hereto as Exhibit F (the "Assumption Agreement").

                                      -13-
<PAGE>
 
     2.6   Excluded Liabilities.  Except as otherwise expressly provided in this
Agreement (including, without limitation, Sections 6.2 and 7.2) or the
Assumption Agreement, the Partnership is assuming only the Assumed Liabilities
and is not assuming any other liability or obligation of the Contributor or any
Affiliate thereof, of whatever nature, whether presently in existence or arising
hereafter, whether known or unknown, or whether absolute or contingent, and all
such other liabilities and obligations of the Contributor and any Affiliate
thereof that are not Assumed Liabilities shall be retained by and remain
obligations and liabilities of the Contributor or such Affiliate (all such
liabilities and obligations being herein referred to as the "Excluded
Liabilities"), including the following:

           (i)   Any Pre-Closing Contingent Liability that is not an Assumed
     Liability;

           (ii)  any obligation or liability relating to the Excluded Assets;
     and

           (iii) any obligation (A) for the payment of severance benefits to
     employees of the Contributor or any of its Affiliates except as set forth
     in Sections 2.8(b) or (c), or (B) attributable to Contributor's or any of
     its Affiliates' employment of any employee, agent or independent contractor
     prior to the Closing Date.

     2.7   Master Intellectual Property Agreement.

     On the Closing Date, the Partnership and Contributor shall execute and
deliver a master intellectual property agreement (the "Master Intellectual
Property Agreement") in substantially the form attached hereto as Exhibit G
providing, among other things, the following:

     (a)   Non-exclusive, royalty-free licenses to the Partnership of any
Intellectual Property and Trademarks used, contemplated for use or that could be
used, in the Contributed Business that is not conveyed to the Partnership
pursuant to Section 2.1.

     (b)   Non-exclusive, royalty-free licenses to the Contributor or its
Affiliates of any Contributed Intellectual Property acquired by the Partnership
pursuant to Section 2.1 of this Agreement used, contemplated for use or that
could be used in the business of the Contributor or its Affiliates.

     (c)   The assignment of the Contributed Intellectual Property to the
Partnership.

     2.8   Employee Matters.  If the Closing Date occurs prior to January 1,
1998, the effective employment date shall be January 1, 1998 and the Contributor
and the Partnership shall enter into an agreement to provide employee services
to the Partnership through December 31, 1997.

     (a)   At or prior to the Closing, the Partnership shall determine which
employees of the Contributor or any Affiliate thereof will be offered employment
by the Partnership.  Any such employee that accepts such offer is herein called
a "Partnership Employee."  Partnership Employees 

                                      -14-
<PAGE>
 
shall be employed effective on (i) January 1, 1998, or (ii) if the Closing Date
is after January 1, 1998, the Closing Date.

     (b)   If, within six months after the Closing Date or in anticipation of
Closing, the Contributor or any Affiliate thereof terminates (other than for
cause) the employment of any employee of the Contributor or any Affiliate
thereof who is primarily associated with the Assets or the Contributed Business
but who does not become a Partnership Employee, then the Partnership will pay to
the Contributor an amount equal to the Basic Severance to the extent the
Contributor or any Affiliate thereof pays the Basic Severance to such employee.
"Basic Severance" means two weeks of base pay for each full year of service by
the employee with the Contributor or any Affiliate (or predecessors of either,
to the extent service therefor is credited by the Contributor), subject to a 52
week maximum and a 12 week minimum; provided, however, that with respect to any
employee who has an employment agreement that contains provisions providing for
one or more payments in the event of a change in control of the Contributor,
"Basic Severance" means up to 52 weeks of base pay notwithstanding the
employee's years of service.

     (c)   Any Partnership Employee whose employment is terminated by the
Partnership (other than for cause) within six months after the Closing Date
shall be entitled to receive a severance benefit from the Partnership equal to
the Basic Severance (which, for purposes of calculating service time, shall
include the employee's time of service with the Contributor, its predecessors
(to the extent service therefor is credited by the Contributor) and the
Partnership).

     (d)   Any employees of the Contributor that the Partnership and the
Contributor agree are necessary for the orderly transfer of the Contributed
Business to the Partnership but who will not become Partnership Employees
("Transition Employees") shall be compensated by the Contributor on terms and
conditions and for a duration to be agreed upon by the Partnership and the
Contributor.  The Partnership shall reimburse the Contributor for any such
agreed upon compensation, including payroll taxes, benefit costs  and workers
compensation premiums and claims, paid by the Contributor to or with respect to
any Transition Employee.

     (e)   If any employee of the Contributor is eligible for and receiving
short term disability benefits or sick pay as of the Closing Date and the
Partnership has offered such employee employment by the Partnership, that
employee shall become employed by the Partnership (and become a Partnership
Employee for purposes of this Section 2.8) upon eligibility to return to active
employment with the Contributor under the applicable conditions of the
Contributor's short term disability benefits or sick pay plan. Partnership
employment shall not be effective until the Contributor verifies that the
employee has satisfied the conditions (if any) to return to active employment.
Until such time as such employee becomes a Partnership Employee the Contributor
shall continue to bear all costs and expenses associated with such employee.

     (f)   Neither the Contributor nor any of its Affiliates shall, at any time
prior to 60 days after the Closing Date, effect a "plant closing" or "mass
layoff", as those terms are defined in the Worker Adjustment and Retraining
Notification Act of 1988 ("WARN"), affecting in whole or in 

                                      -15-
<PAGE>
 
part any facility, site of employment, operating unit or employee of the
Contributor or any of its Affiliates without complying fully with the notice and
all other applicable requirements of WARN.

     (g)   In connection with the development by the Partnership of benefit
plans and programs for Partnership Employees as provided in the Master
Transaction Agreement, (i) the Contributor may direct the trustee of any of its
employee plans to transfer assets and liabilities in those employee plans
associated with the accrued benefits of Partnership Employees to a comparable
Partnership benefit plan in which the Partnership Employees participate, and
(ii) the Contributor or any of its Affiliates may direct the trustee of its
grantor trust to transfer assets and liabilities relating to any accounts for
Partnership Employees under an executive deferral plan to a trust established by
the Partnership to provide benefits under a comparable non-qualified deferred
compensation plan; provided, however, with respect to (i) and (ii) above, the
assets associated with any such plans, as of the Closing Date, are not less than
the liabilities associated therewith as determined by the Partnership and a
trust to trust transfer of assets does not result in a taxable event. In
connection with the development and implementation of such plans and programs,
the Partnership agrees, for purposes of calculating service time, to include
each employee's time of service with the Contributor, its predecessors (to the
extent service therefor is credited by the Contributor) or the Partnership. The
Partnership will accept sponsorship of the Assumed Plan as soon as practicable
after the Closing Date and the Contributor shall make all necessary governmental
filings in connection therewith on a timely basis. In connection with the
transfer of the sponsorship of the Assumed Plan, the Partnership may require
such representations concerning the Assumed Plan as the Partnership reasonably
determines are necessary, including, that the assets are not less than the
liabilities and no Consents from the union are necessary for such transfer.

     (h)   To the extent that the Partnership adopts benefit plans or policies
that contemplate the provision of post-retirement life and medical benefits to
the Partnership Employees, the Partnership shall record and recognize, in
accordance with GAAP, the associated liability for providing the post-retirement
life and medical benefits to the Partnership Employees.

     2.9   Joint Contracts.

     (a)   Any Contributed Contracts contributed to the Partnership pursuant to
Section 2.1 that relate principally to the Contributed Business but also relate
to the business (other than the Contributed Business) of the Contributor or its
Affiliates will be made available to the Contributor and its Affiliates by the
Partnership pursuant to the Shared Services Agreements and other arrangements by
which the Contributor and its Affiliates will enjoy the benefits of such
Contributed Contracts as they relate to their business (other than the
Contributed Business) on the same terms and conditions as the Partnership.

     (b)   Any Contracts that relate principally to the business (other than the
Contributed Business) of the Contributor or its Affiliates but also relate to
the Contributed Business will be made available to the Partnership by the
Contributor or its Affiliates pursuant to the Shared Services Agreements and
other arrangements by which the Partnership will enjoy the benefits of such

                                      -16-
<PAGE>
 
Contracts as they relate to the Contributed Business on the same terms and
conditions as the Contributor or its Affiliates.


                                   SECTION 3
               REPRESENTATIONS AND WARRANTIES OF THE CONTRIBUTOR

     Except as set forth on Schedule 3 or in the SEC Reports, the Contributor
represents and warrants to the Partnership as follows:

     3.1   Due Organization; Good Standing and Power.  The Contributor is a
corporation duly organized, validly existing and in good standing under the laws
of the Commonwealth of Virginia and has the corporate power and authority to
own, lease and operate the properties to be contributed hereunder and to conduct
the Contributed Business as now conducted by it.  The Contributor has all
corporate power and authority to enter into this Agreement and the Assignment
and Assumption Agreements and to perform its obligations hereunder and
thereunder.  The Contributor is duly authorized, qualified or licensed to do
business as a foreign corporation, and is in good standing, in the State of
Texas and in each of the other jurisdictions in which its right, title or
interest in or to any of the Assets held by it, or the conduct of the
Contributed Business by it, requires such authorization, qualification or
licensing, except where the failure to so qualify or to be in good standing
would not reasonably be expected to have a Material Adverse Effect.

     3.2   Authorization and Validity of Agreements. The execution, delivery and
performance of this Agreement and the other Related Agreements by the
Contributor and the consummation by it of the transactions contemplated hereby
and thereby have been duly authorized by the Board of Directors of the
Contributor. Except to the extent heretofore obtained, no other corporate or
stockholder action is necessary for the authorization, execution, delivery and
performance by the Contributor of this Agreement and the other Related
Agreements and the consummation by the Contributor of the transactions
contemplated hereby or thereby. This Agreement and the other Related Agreements
have been duly executed and delivered by the Contributor and constitute legal,
valid and binding obligations of the Contributor, enforceable in accordance with
their terms, except as the same may be limited by bankruptcy, insolvency,
reorganization, moratorium and other laws relating to or affecting creditors'
rights generally and by general equity principles.

     3.3   No Consents Required; No Conflict with Instruments to which the
Contributor is a Party.  The execution, delivery and performance of this
Agreement and the other Related Agreements by the Contributor or by any
Affiliate of the Contributor that is a party thereto and the consummation by the
Contributor or any such Affiliate  of the transactions contemplated thereby (i)
will not require any Consent except for such Consents the failure of which to be
obtained or made, would not in the aggregate reasonably be expected to have a
Material Adverse Effect; and (ii) will not violate (with or without the giving
of notice or the lapse of time or both), or conflict with, or result in the
breach or termination of any provision of, or constitute a default under, or
result in the 

                                      -17-
<PAGE>
 
acceleration of the performance of the obligations of the Contributor or any
such Affiliate under, or result in the creation of an Encumbrance upon any
Assets or a portion of the Contributed Business pursuant to, the charter or by-
laws of the Contributor or any such Affiliate, or any indenture, mortgage, deed
of trust, lease, licensing agreement, contract, instrument or other agreement to
which the Contributor or any such Affiliate is a party or by which the
Contributor or any such Affiliate or any of the Assets held by the Contributor
or any such Affiliate is bound, except for such violations, conflicts, breaches,
terminations, defaults, accelerations or Encumbrances which would not in the
aggregate reasonably be expected to have a Material Adverse Effect.

     3.4   Employee Benefits.

     (a)   (i)   Each of the Contributor's Defined Benefit and Defined
     Contribution Pension Plans covering employees ("Employee Plan") is in
     substantial compliance with applicable requirements prescribed by any and
     all Legal Requirements, including, but not limited to the Code, except for
     violations the occurrence of which would not in the aggregate reasonably be
     expected to have a Material Adverse Effect.  Each Employee Plan that is
     intended to be qualified under Section 401(a) of the Code currently has a
     favorable determination letter from the Internal Revenue Service as to that
     Plan's qualification under Section 401(a) of the Code and nothing has
     occurred since the date of such letter that could reasonably be expected to
     cause the loss of such qualification.

           (ii)  The Contributor has in all material respects performed all
     obligations required to be performed by it under ERISA, the Code and any
     other applicable Legal Requirements and under the terms of each Employee
     Plan, except such failures to perform which would not in the aggregate
     reasonably be expected to have a Material Adverse Effect.  The Contributor
     has received no written notice of the existence of any material default or
     violation by any other party of any of such Legal Requirements, terms or
     requirements applicable to any of the Employee Plans.

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

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

           (v)   All contributions required to be made under the terms of the
     Contributor's Employee Plans have been timely made.  No Employee Plan has
     an "accumulated funding deficiency" (within the meaning of section 412 of
     the Code or Section 402 of ERISA).

                                      -18-
<PAGE>
 
     (b)   All of the Contributor's Agroup health plans' (within the meaning of
Code Section 5000(b)(1)) have been operated in substantial compliance with the
group health plan continuation coverage requirements of Section 4980B of the
Code and Sections 601 through 608 of ERISA, Title XXII of the Public Health
Service Act and the provisions of the Social Security Act.

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

     3.5   Title to Assets; Absence of Liens and Encumbrances; Leases.

     (a)   The Contributor has good and marketable title to all of the Fee
Interests described in the Deeds, free and clear of all Encumbrances, except (i)
those exceptions contained in the Deeds, (ii) liens for current taxes not yet
due and payable and mechanics and similar statutory liens arising in the
ordinary course of business, (iii) liens of employees and laborers for current
wages not yet due; (iv) building, zoning and health regulations of the
jurisdictions in which the Assets are located; and (v) such imperfections of
title, easements and Encumbrances, if any, as do not in the aggregate materially
detract from the value or materially interfere with the use of the Assets as
they are currently being used or as otherwise would not reasonably be expected
to have a Material Adverse Effect.

     (b)   The Contributor is the sole lessee under the Leases and the sole
party entitled to the Leasehold interests in favor of the lessee thereunder, and
the sole owner of the improvements situated on the Leased Premises, free and
clear of all Encumbrances affecting the Leaseholds except such Encumbrances, if
any, as do not in the aggregate materially detract from the value or materially
interfere with the use of the Assets or as otherwise would not reasonably be
expected to have a Material Adverse Effect. Neither Contributor nor any
Affiliate thereof has received from or delivered to the lessors under the
Leaseholds any written notice of termination or threat of termination of the
respective Leaseholds. True and complete copies of all written lease agreements
(including any written amendments or modifications thereof) constituting, or
evidencing the terms of, the Leaseholds have been delivered to the Partnership.
No material default or event of default on the part of the Contributor nor any
Affiliate thereof under the provisions of any of the Leaseholds, and no event
that with the giving of notice or passage of time or both would constitute such
default or event of default on the part of the Contributor, has occurred (which
default or event of default has not been cured). Neither the Contributor nor any
Affiliate thereof has received any written notice from any lessor under any
Leasehold, that any material default or event of default on the part of the
Contributor or such Affiliate as lessee under the provisions of any Leaseholds,
or that any event that with the giving of notice or passage of time or both
would constitute such a default or an event of default on the part of the
Contributor or any such Affiliate, as lessee, has occurred (which default or
event of default has not been cured). No material default or event of default on
the part of the lessor under the provisions of any of such Leaseholds, and no
event that with the giving of notice 

                                      -19-
<PAGE>
 
or passage of time or both would constitute such default or event of default on
the part of any such lessor, has occurred (which default or event of default has
not been cured).

     (c)   The Contributor or an Affiliate thereof has good title to all of the
personal property purported to be owned by it, free and clear of all
Encumbrances, except for liens for Taxes not yet due and payable and such
Encumbrances, if any, that do not in the aggregate materially detract from the
value or materially interfere with the use of the Assets (as they are currently
being used) or as otherwise would not reasonably be expected to have a Material
Adverse Effect.

     3.6   Title Matters; Defects in Improvements.  There are no trespassers or
other adverse parties in possession on or affecting the Fee Interests or the
Leased Premises that would reasonably be expected to have a Material Adverse
Effect.  Neither the Contributor nor any Affiliate thereof has granted and none
of the foregoing is party to any unrecorded options, rights of refusal, sales
contracts or other such contractual rights in favor of any third parties
relating to the Fee Interests or the Leased Premises.  No written notice has
been received by the Contributor or any Affiliate thereof from any insurance
company with respect to the Fee Interests or the Leased Premises or by any board
of fire underwriters claiming any material defects or deficiencies or requiring
the performance of any repairs, replacement, alteration or other work relating
to the improvements situated thereon (in each case, which have not been cured).

     3.7   Working Capital.  The Contributor has operated the Contributed
Business in the ordinary course of business from March 31, 1997 to the Closing
Date such that the Inventory, Stores Inventory, Prepaid Expenses and Accounts
Receivable, as of the Closing Date, are at substantially the same level as would
have existed for the Contributor without regard to the transactions contemplated
by the Master Transaction Agreement.

     3.8   Technology and Similar Rights. The Contributor owns or is licensed to
use all of the Intellectual Property, Licensed Technology and Licensed
Trademarks, and the Intellectual Property, Licensed Technology and Licensed
Trademarks together constitute all relevant patents, pending patent
applications, invention disclosures, copyrights, software, trade secrets,
technical information, technology, know-how, processes, tradenames, trademarks,
trademark registrations or applications, copyrights, copyright applications or
registrations or any derivative thereof or design used in connection therewith
necessary for the normal operation and conduct of the Contributed Business as it
is currently operated and conducted, except where the failure to have such
ownership or licenses would not reasonably be expected to have a Material
Adverse Effect.

     3.9   Government Licenses, Permits and Related Approvals.  The Government
Licenses constitute all those necessary for the normal operation and conduct of
the Contributed Business as it is currently operated and conducted, except where
the failure to have such Government Licenses would not reasonably be expected to
have a Material Adverse Effect.

     3.10  All Necessary Assets.  The Assets together with the rights under the
Related Agreements constitute all property and other rights necessary to enable
the Partnership to operate 

                                      -20-
<PAGE>
 
and conduct the Contributed Business in substantially the same manner as it is
being operated and conducted on the date of this Agreement, except in all cases
where the failure of the Partnership to acquire such property or other rights by
conveyance or license would not in the aggregate reasonably be expected to have
a Material Adverse Effect.

     3.11  Conduct of Business in Compliance with Regulatory and Contractual
Requirements.  The Contributor, and any Affiliate thereof, is operating and
conducting the Contributed Business in compliance with all applicable Legal
Requirements, rights of concession, licenses, know-how or other proprietary
rights of others, the failure to comply with which would reasonably be expected
to have a Material Adverse Effect.

     3.12  Legal Proceedings.  There is no litigation, proceeding, claim,
grievance, arbitration, investigation or other action to which the Contributor
or any Affiliate thereof is a party (i) that is pending or, to the Knowledge of
the Contributor, threatened, (ii) that relates in any way to the Assets, to the
operation or conduct of the Contributed Business, or to the transactions
contemplated by this Agreement, and (iii) that upon resolution adverse to
Contributor or any of its Affiliates, could reasonably be expected to have a
Material Adverse Effect.

     3.13  Consents. Except for the Consents set forth in Schedule 4.3(e) of the
Master Transaction Agreement, there are no Consents required to be obtained by
the Contributor or any of its Affiliates in connection with the transfer of the
Assets or the Contributed Business to the Partnership except to the extent the
failure to obtain such Consent would not be reasonably likely to have a Material
Adverse Effect.

     3.14  Tax Matters.

     (a)   There are no material liens for Taxes (other than for current Taxes
not yet due and payable) upon the Assets.

     (b)   None of the Assets directly or indirectly secures any indebtedness
for money borrowed the interest on which is tax-exempt.

     3.15  [Reserved].

     3.16  HSE Matters.  Except as would not be reasonably likely to have a
Material Adverse Effect:

     (a)   (i)   The Fee Interests, the Leased Premises and the operations of
the Contributor and any Affiliate thereof in connection with the Contributed
Business are in compliance with all HSE Laws and (ii) to the extent arising out
of the Contributor's or any Affiliate's ownership or use of the Assets or
operation of the Contributed Business, there are no Chemical Substances held,
located, released, generated, treated, stored or disposed of, on, under or from
the Fee Interests or the Leased Premises or in, on or from any fixtures or
improvement thereon in excess of any standard 

                                      -21-
<PAGE>
 
prescribed or permitted by any HSE Laws or which require corrective or other
action pursuant to the provisions of any HSE Laws.

     (b)   Neither the Contributor nor any Affiliate has received any notice
from any federal, state, or local agency naming the Contributor or such
Affiliate as a potentially responsible party ("PRP"), or otherwise notifying the
Contributor or such Affiliate of any potential liability under either the
Comprehensive Environmental Response, Compensation and Liability Act of 1980, as
amended, ("CERCLA" or "Superfund"), the Resource Conservation and Recovery Act
of 1976, as amended ("RCRA"), or any state statute, rule or local regulation
imposing liability similar to CERCLA or RCRA that relates in any way to any
Chemical Substances generated by or derived from the operations on the Fee
Interests, or the Leased Premises; nor has the Contributor nor any of its
Affiliates received any comparable claim or notice from any private party.

     (c)   The Contributor or an Affiliate thereof, as applicable, has been and
is, in compliance with, all permits, licenses, approvals, permission, or
authorizations necessary for its operations in connection with the Contributed
Business to comply in all respects with HSE Laws.

     (d)   (i)   Neither the Contributor nor any Affiliate thereof has received
written notice of any actual, impending, or potential proceedings, allegations,
claims, losses, actions, investigations or inquiries of any kind in connection
with the Contributed Business and HSE Laws or Chemical Substances ("HSE
Proceedings") and (ii) neither the Contributor nor any Affiliate thereof has any
Knowledge of any facts, events or occurrences that would reasonably be expected
to result in any HSE Proceedings being brought.

     (e)   Neither the Contributor nor any Affiliate thereof is party to, or is
subject to the terms of, any consent order, consent judgment, consent decree,
court or administrative order or judgment, agreement, schedule, or decree issued
by any Authority with respect to the Contributed Business.

     3.17  Investigation to Acquire Knowledge.  Each of the persons covered by
the definition of "Knowledge" set forth in Section 1 has reviewed, with counsel
to the Contributor, the other representations and warranties contained in, and
the Schedules that relate to, this Section 3 to the extent that they relate to
such person's area of responsibility or expertise and has made a reasonable
inquiry as to the accuracy and completeness of such representations, warranties
and Schedules.


                                   SECTION 4
               REPRESENTATIONS AND WARRANTIES OF THE PARTNERSHIP

     The Partnership represents and warrants to the Contributor as follows:

     4.1   Due Organization; Good Standing and Power.  The Partnership is a
limited partnership duly formed and validly existing under the laws of the State
of Delaware.  The Partnership has all partnership power and authority to enter
into this Agreement and  the other 

                                      -22-
<PAGE>
 
Related Agreements and to perform its obligations hereunder and thereunder. The
Partnership is duly authorized, qualified or licensed to do business as a
foreign partnership, in each of the jurisdictions in which its right, title or
interest in or to any asset, or the conduct of its business, requires such
authorization, qualification or licensing, except where the failure to so
qualify would not have a material adverse effect on the ability of the
Partnership to perform its obligations hereunder or under the Assignment and
Assumption Agreements.

     4.2   Authorization and Validity of Agreement.  The execution, delivery and
performance of this Agreement and the other Related Agreements by the
Partnership and the consummation by the Partnership of the transactions
contemplated hereby and thereby have been duly authorized by all necessary
partnership action on the part of the Partnership.  No other partnership action
is necessary for the authorization, execution, delivery and performance by the
Partnership of this Agreement, the other Related Agreements and the consummation
by the Partnership of the transactions contemplated hereby or thereby. This
Agreement and the other Related Agreements have been duly executed and delivered
by the Partnership and constitute legal, valid and binding obligations of the
Partnership, enforceable in accordance with their terms, except as the same may
be limited by bankruptcy, insolvency, reorganization, moratorium and other laws
relating to or affecting creditors' rights generally and by general equity
principles.

     4.3   No Consents Required; No Conflict with Instruments to which the
Partnership is a Party.  The execution, delivery and performance of this
Agreement and the other Related Agreements by the Partnership and the
consummation by it of the transactions contemplated thereby (i) will not require
any Consent except for such Consents the failure of which to be obtained or
made, would not in the aggregate reasonably be expected to have a Material
Adverse Effect on the Partnership's ability to perform its obligations hereunder
or thereunder, and (ii) will not violate (with or without the giving of notice
or the lapse of time or both), conflict with, or result in the breach or
termination of any provision of, or constitute a default under, or result in the
acceleration of the performance of the obligations of the Partnership under, the
partnership agreement of the Partnership, or any indenture, mortgage, deed of
trust, lease, licensing agreement, contract, instrument or other agreement to
which the Partnership is a party or by which the Partnership or any of its
assets or properties is bound, except for such violations, conflicts, breaches,
terminations, defaults, accelerations or liens which would not in the aggregate
reasonably be expected to have a material adverse effect on the Partnership's
ability to perform its obligations hereunder or thereunder.


                                   SECTION 5
                     COVENANTS SUBSEQUENT TO CLOSING DATE

     5.1   Access to Information.  Following the Closing Date, the Partnership
shall afford, and will cause its Affiliates to afford, to the Contributor, its
counsel, accountants and other authorized representatives, during normal
business hours, reasonable access to the books, records and other data of the
Contributed Business with respect to the period prior to the Closing Date (and
any personnel 

                                      -23-
<PAGE>
 
familiar therewith) to the extent that such access may be reasonably required by
the Contributor to facilitate (i) the preparation by the Contributor of such tax
returns as it may be required to file with respect to the operations of the
Assets and the Contributed Business or in connection with any audit, amended
return, claim for refund or any proceeding with respect thereto, (ii) the
investigation, litigation and final disposition of any claims which may have
been or may be made against the Contributor in connection with the Assets and
the Contributed Business, (iii) the payment of any amount in connection with any
liabilities or obligations which have not been assumed by the Partnership under
this Agreement and (iv) for any other reasonable business purpose. For a period
of ten years after the date of this Agreement, the Partnership will not dispose
of, alter or destroy any such books, records and other data without giving 90
days' prior notice to the Contributor to permit it, at its expense, to examine,
duplicate or repossess such records, files, documents and correspondence.

     5.2   Mail or Other Communications. The Contributor authorizes and empowers
the Partnership on and after the Closing Date to receive and open all mail
received by the Partnership relating to the Contributed Business or the Assets
and to deal with the contents of such communications in any proper manner. The
Contributor shall promptly deliver to the Partnership any mail or other
communication received by it on and after the Closing Date pertaining to the
Contributed Business or the Assets and any cash, checks or other instruments of
payment to which the Partnership is entitled. The Partnership shall promptly
deliver to the Contributor any mail or other communication received by it after
the Closing Date pertaining to the Excluded Assets or Excluded Liabilities, and
any cash, checks or other instruments of payment in respect of such.

     5.3   Use of Contributor's Trade Name.  Except as set forth on Schedule
2.2(d), after the Closing Date the Partnership shall be permitted to use any
items of Inventory or packaging material, any sales or promotional materials,
any forms or documents or any other printed material that bear any of the names
"Millennium" or "Quantum" or other statutory names, trade names or trademarks,
indications or descriptions of which such names or any name similar thereto
forms a part until the earlier to occur of (i) such time as inventory of such
materials existing as of the Closing Date are used, or (ii) two years after the
Closing Date.

     5.4   Closing Date Balance Sheet.  Not later than 60 days after the Closing
Date, the Contributor shall cause Price Waterhouse LLP to prepare and deliver to
the Contributor and the Partnership an audited balance sheet of the Contributed
Business as of the Closing Date (the "Closing Date Balance Sheet").

     5.5   Payment of Retained Accounts Payable. The Contributor will retain all
accounts payable including Retained Accounts Payable; however the Partnership,
as payment agent of the Contributor, shall pay such amounts on behalf of the
Contributor on a timely basis. As soon as practicable following the end of each
month after which such Retained Accounts Payable are paid by the Partnership,
but in any event within fifteen days after the end of such month, each
Contributor will reimburse the Partnership for such payments attributable to its
Contributed Business.

                                      -24-
<PAGE>
 
     5.6   Collection of Accounts Receivable.  The Partnership, as collecting
agent for the Contributor, shall take all commercially reasonable efforts to
collect the Accounts Receivable.  As soon as practicable after such Accounts
Receivable are collected, but in any event within fifteen days after the end of
each month, the Partnership shall remit such collections to the Contributor.  If
the Accounts Receivable as of the Closing Date as set forth in the Closing Date
Balance Sheet (the "Confirmed Accounts Receivable") are less than $250 million,
then in addition to the foregoing, the Partnership shall pay the Contributor the
difference between $250 million and the Confirmed Accounts Receivable within 10
days after the receipt of the Closing Date Balance Sheet.  If the Confirmed
Accounts Receivable are more than $250 million, the Contributor shall pay the
Partnership the difference between $250 million and the Confirmed Accounts
Receivable.  Collections on Accounts Receivable shall be applied on a specific
identification basis.  The Partnership will report monthly in writing  to
Contributor on the amounts collected during the preceding month, and shall
provide an aging summary of uncollected accounts and a detailed description of
each problem account (45 or more days overdue).  On reasonable notice to the
Partnership, Contributor shall have the right to take over the collection
process for any problem account.

     5.7   Reimbursement for Prepaid Expenses.  The Partnership and the
Contributor acknowledge that the Prepaid Expenses attributable to its
Contributed Business have been conveyed to the Partnership solely in order to
facilitate the timely and efficient transfer of the Contributed Business to the
Partnership.  Consequently, the Partnership shall reimburse the Contributor for
the Prepaid Expenses associated with its Contributed Business (other than the
prepaid expenses for "turnaround" costs) within 10 days following the receipt of
the Closing Date Balance Sheet.


                                   SECTION 6
                         SURVIVAL AND INDEMNIFICATION

     6.1   Survival Limitations.  The representations and warranties of the
parties hereto contained in this Agreement or in any certificate or other
writing delivered pursuant hereto or in connection herewith shall survive the
Closing until the date that is 60 months after the Closing Date, except (i)
Section 3.14, which shall survive until the expiration of the applicable statute
of limitations and (ii) Section 3.5, which shall survive without limitation and
shall not be merged with the Deeds.  No action can be brought with respect to
any breach of any representation or warranty (except with respect to Section
3.5) pursuant to this Agreement unless a written notice that complies with
Section 6.3 has been delivered pursuant to such Section 6.3 prior to the
expiration of the survival period applicable to such representation or warranty;
provided that upon the giving of such notice, notwithstanding any other
provision of this Agreement the representation and warranty that is the basis of
such action shall continue with respect to such action beyond the time at which
the representation and warranty would otherwise terminate.

     6.2   Indemnification.

                                      -25-
<PAGE>
 
     (a)   Subject to the other provisions of this Section 6, the Contributor
hereby agrees, to the fullest extent permitted by applicable law, to indemnify,
defend and hold harmless the Partnership and its Affiliates and their respective
officers, directors and employees from, against and in respect of any losses,
claims, damages, fines, penalties, assessments by public agencies, settlement,
cost or expenses (including costs of defense and attorneys' fees) and other
liabilities (any of the foregoing being a "Liability") incurred or suffered by
the Partnership or any of its Affiliates, arising out of, in connection with or
relating to:

           (i)   Any misrepresentation in or breach of the representations and
     warranties of the Contributor or any of its Affiliates in this Agreement,
     the Assignment and Assumption Agreements, the Master Intellectual Property
     Agreement, or the Master Transaction Agreement;

           (ii)  Any failure of the Contributor or any of its Affiliates to
     perform any of its covenants or obligations contained in this Agreement,
     the Assignment and Assumption Agreements, the Master Intellectual Property
     Agreement, or the Master Transaction Agreement;

           (iii) Excluded Liabilities; or

           (iv)  Any Pre-Closing Contingent Liability that is not an Assumed
     Liability;

           provided, however, that the following limitations shall apply to the
Contributor's indemnification obligations in clauses (i) and (iv) above:

           (A) the Contributor shall not have any indemnification obligation
     under clause (i) and (iv) above for any individual Liability unless the
     amount of such Liability exceeds $25,000 (the "Individual Basket") (it
     being understood that all Liabilities arising from the same event,
     condition or set of circumstances shall be considered as an individual
     Liability for purposes of such calculation), but if the amount of such
     Liability exceeds the Individual Basket, the entire amount of such
     Liability, including the first $25,000 of such Liability, may be the
     subject of indemnification hereunder; provided, further, that the parties
     agree that the amount of Liability for which indemnification may be sought
     for breach of any representation or warranty under clause (i) above shall
     be calculated taking into account the Individual Basket but without regard
     to any qualification or exception regarding materiality or Material Adverse
     Effect qualification contained in such representation or warranty (it being
     understood that such materiality or Material Adverse Effect qualifications
     shall apply for purposes of determining whether there has been such a
     breach in the first place, but once it has been established that there is
     such a breach, the Partnership shall be entitled to indemnity relating back
     to the first dollar); and

           (B) to the extent any misrepresentation in or breach of the
     representations and warranties of the Contributor results in a Liability of
     the Partnership in excess of the 

                                      -26-
<PAGE>
 
     Individual Basket and such Liability would also constitute a Pre-Closing
     Contingent Liability, such misrepresentation or breach shall be treated as
     a Pre-Closing Contingent Liability.

     (b)   NOTWITHSTANDING ANY OTHER PROVISION OF THIS AGREEMENT, TO THE FULLEST
EXTENT PERMITTED BY LAW, NEITHER THE CONTRIBUTOR NOR ANY OF ITS AGENTS,
EMPLOYEES, REPRESENTATIVES OR AFFILIATES SHALL BE LIABLE FOR CONSEQUENTIAL,
INCIDENTAL, INDIRECT OR PUNITIVE DAMAGES IN CONNECTION WITH DIRECT CLAIMS BY THE
PARTNERSHIP (I.E., A CLAIM BY THE PARTNERSHIP THAT DOES NOT SEEK REIMBURSEMENT
FOR A THIRD PARTY CLAIM PAID OR PAYABLE BY THE PARTNERSHIP) WITH RESPECT TO
THEIR INDEMNIFICATION OBLIGATIONS UNDER THIS AGREEMENT UNLESS ANY SUCH CLAIM
ARISES OUT OF THE FRAUDULENT ACTIONS OF THE CONTRIBUTOR.  IN DETERMINING THE
AMOUNT OF ANY LOSS, LIABILITY, OR EXPENSE FOR WHICH THE PARTNERSHIP IS ENTITLED
TO INDEMNIFICATION UNDER THIS AGREEMENT, THE GROSS AMOUNT THEREOF WILL BE
REDUCED (BUT NOT BELOW ZERO) BY THE NET PRESENT VALUE OF ANY CORRELATIVE
INSURANCE PROCEEDS ACTUALLY REALIZED BY THE PARTNERSHIP UNDER POLICIES TO THE
EXTENT THAT THE FUTURE PREMIUM RATE WILL NOT BE INCREASED BY CLAIM EXPERIENCE.

     (c)   Notwithstanding the provisions of Sections 6.2(a)(i) and 6.2(a)(iv),
it is expressly agreed that the Contributor shall not be required to indemnify
the Partnership for any Liability arising out of, in connection with or related
to any HSE Claim to the extent that the condition, event, circumstance or other
basis for the HSE Claim was exacerbated or accelerated by the Partnership.  The
Partnership shall not be deemed to have exacerbated a condition, event,
circumstance or other basis for an HSE Claim by reason of the continuance
thereof after the Closing (i) under circumstances where the Partnership does not
know of its existence and has not breached any legal duty to have conducted an
investigation or inquiry that would have uncovered the matter or (ii) under
circumstances where the Partnership does know of its existence but is taking
commercially reasonable actions to cure the matter or to otherwise achieve
compliance in a commercially reasonable and prudent manner.

     (d)   Subject to the other provisions of this Section 6, the Partnership
hereby indemnifies, to the fullest extent permitted by law, the Contributor and
its Affiliates against and agrees to hold each of them harmless from any and all
Liability incurred or suffered by the Contributor or any of its Affiliates
arising out of or relating to:

           (i)   Any misrepresentation in or breach of the representations and
     warranties of the Partnership or the failure of the Partnership to perform
     any of its covenants or obligations contained in this Agreement and the
     Assignment and Assumption Agreements or the Master Intellectual Property
     Agreement;

           (ii)  Assumed Liabilities; or

                                      -27-
<PAGE>
 
           (iii) Any HSE Claim to the extent arising out of the Partnership's
     exacerbation or acceleration of such HSE Claim.

     (e)   NOTWITHSTANDING ANY OTHER PROVISION OF THIS AGREEMENT, TO THE FULLEST
EXTENT PERMITTED BY LAW, NEITHER THE PARTNERSHIP NOR ANY OF ITS AGENTS,
EMPLOYEES, REPRESENTATIVES OR AFFILIATES SHALL BE LIABLE FOR CONSEQUENTIAL,
INCIDENTAL, INDIRECT OR PUNITIVE DAMAGES IN CONNECTION WITH DIRECT CLAIMS BY THE
CONTRIBUTOR WITH RESPECT TO THEIR INDEMNIFICATION OBLIGATIONS UNDER THIS
AGREEMENT UNLESS ANY SUCH CLAIM ARISES OUT OF THE FRAUDULENT ACTIONS OF THE
PARTNERSHIP.  IN DETERMINING THE AMOUNT OF ANY LOSS, LIABILITY, OR EXPENSE FOR
WHICH THE CONTRIBUTOR IS ENTITLED TO INDEMNIFICATION UNDER THIS AGREEMENT, THE
GROSS AMOUNT THEREOF WILL BE REDUCED (BUT NOT BELOW ZERO) BY THE NET PRESENT
VALUE OF ANY CORRELATIVE INSURANCE PROCEEDS ACTUALLY REALIZED BY THE CONTRIBUTOR
UNDER POLICIES TO THE EXTENT THE FUTURE PREMIUM RATE WILL NOT BE INCREASED BY
CLAIM EXPERIENCE.

     (f)   The rights provided to the Partnership pursuant to this Section 6, as
limited by and subject to the provisions of this Section 6, shall be the
Partnership's sole remedy for breach of representation and warranty by or
covenant or obligation of the Contributor under this Agreement,  the Assignment
and Assumption Agreements and the Master Intellectual Property Agreement.  The
rights provided to the Contributor pursuant to this Section 6, as limited by and
subject to the provisions of this Section 6, shall be the Contributor's sole
remedy for breach of representation and warranty by or covenant of obligation of
the Partnership under this Agreement, the Assignment and Assumption Agreements
and the Master Intellectual Property Agreement.

     6.3   Procedures.

     (a)   Any Person seeking indemnification under Section 6.2 (the
"Indemnified Party") agrees to give prompt written notice to the party against
whom indemnity is sought (the "Indemnifying Party") of the assertion of any
claim that does not involve a Third Party Claim, which notice shall describe in
reasonable detail the nature of the claim, an estimate of the amount of damages
attributable to such claim to the extent feasible and the basis of the
Indemnified Party's request for indemnification under this Agreement. If the
Indemnifying Party disputes such claim and such dispute is not resolved by the
parties, such dispute shall be resolved in accordance with Section 7.9.

     (b)   If an Indemnified Party is notified of a Third Party Claim which may
give rise to a claim for indemnification against any Indemnifying Party under
this Section, then the Indemnified Party shall promptly notify each Indemnifying
Party thereof in writing (including copies of all papers served with respect to
such Third Party Claim), which notice shall describe in reasonable detail the
nature of the Third Party Claim, an estimate of the amount of damages
attributable to the Third Party 

                                      -28-
<PAGE>
 
Claim to the extent feasible and the basis of the Indemnified Party's request
for indemnification under this Agreement; provided that any failure to timely
give such notice shall not relieve the Indemnifying Party of any of its
obligations under this Section 6 except to the extent that such failure
prejudices or impairs, in any material respect, any of the rights or obligations
of the Indemnifying Party.

     (c)   Any Indemnifying Party may, and at the request of the Indemnified
Party shall, participate in and control the defense of the Third Party Claim
with counsel of its choice reasonably satisfactory to the Indemnified Party.
The Indemnified Party shall have the right to employ separate counsel in any
such action and to participate in the defense thereof, but the fees and expenses
of such counsel shall be at the expense of the Indemnified Party unless (i) the
employment thereof has been specifically authorized in writing by the
Indemnifying Party, (ii) the Indemnifying Party failed to assume the defense and
employ counsel or failed to diligently prosecute or settle the Third Party Claim
or (iii) there shall exist or develop a conflict that would ethically prohibit
counsel to the Indemnifying Party from representing the Indemnified Party.  If
requested by the Indemnifying Party, the Indemnified Party agrees to cooperate
with the Indemnifying Party and its counsel in contesting any Third Party Claim
that the Indemnifying Party elects to contest, including, without limitation, by
making any counterclaim against the person or entity asserting the Third Party
Claim or any cross-complaint against any person or entity, in each case only if
and to the extent that any such counterclaim or cross-complaint arises from the
same actions or facts giving rise to the Third Party Claim.  The Indemnifying
Party shall be the sole judge of the acceptability of any compromise or
settlement of any claim, litigation or proceeding in respect of which indemnity
may be sought hereunder, provided that the Indemnifying Party will give the
Indemnified Party reasonable prior written notice of any such proposed
settlement or compromise and will not consent to the entry of any judgment or
enter into any settlement with respect to any Third Party Claim without the
prior written consent of the Indemnified Party, which shall not be unreasonably
withheld.  The Indemnifying Party (if the Indemnified Party is entitled to
indemnification hereunder) shall reimburse the Indemnified Party for its
reasonable out of pocket costs incurred with respect to such cooperation.

     (d)   If the Indemnifying Party fails to assume the defense of a Third
Party Claim within a reasonable period after receipt of written notice pursuant
to the first sentence of subparagraph (c), or if the Indemnifying Party assumes
the defense of the Indemnified Party pursuant to subparagraph (c) but fails
diligently to prosecute or settle the Third Party Claim, then the Indemnified
Party shall have the right to defend, at the sole cost and expense of the
Indemnifying Party (if the Indemnified Party is entitled to indemnification
hereunder), the Third Party Claim by all appropriate proceedings, which
proceedings shall be promptly and vigorously prosecuted by the Indemnified Party
to a final conclusion or settled. The Indemnified Party shall have full control
of such defense and proceedings; provided that the Indemnified Party shall not
settle such Third Party Claim without the written consent of the Indemnifying
Party, which consent shall not be unreasonably withheld. The Indemnifying Party
may participate in, but not control, any defense or settlement controlled by the
Indemnified Party pursuant to this Section, and the Indemnifying Party shall
bear its own costs and expenses with respect to such participation.

                                      -29-
<PAGE>
 
     (e)   Notwithstanding the other provisions of this Section 6.3, if the
Indemnifying Party disputes its potential liability to the Indemnified Party
under this Section 6.3 and if such dispute is resolved in favor of the
Indemnifying Party, the Indemnifying Party shall not be required to bear the
costs and expenses of the Indemnified Party's defense pursuant to this Section
6.3 or of the Indemnifying Party's participation therein at the Indemnified
Party's request, and the Indemnified Party shall reimburse the Indemnifying
Party in full for all costs and expenses of the litigation concerning such
dispute.  If a dispute over potential liability is resolved in favor of the
Indemnified Party, the Indemnifying Party shall reimburse the Indemnified Party
in full for all costs of the litigation concerning such dispute.

     (f)   After it has been determined, by acknowledgment, agreement, or ruling
of court of law, that an Indemnifying Party is liable to the Indemnified Party
under this Section 6, the Indemnifying Party shall pay or cause to be paid to
the Indemnified Party the amount of the Liability  within ten business days of
receipt by the Indemnifying Party of a notice reasonably itemizing the amount of
the Liability but only to the extent actually paid or suffered by the
Indemnified Party.

     (g)   In the event a Third Party Claim is brought in which the liability as
between the Partnership and the Contributor is alleged to be joint (it being
agreed that any Third Party Claim related to a Pre-Closing Contingent Liability
shall be deemed joint) or in which the entitlement to indemnification under this
Section 6 has not been determined, the Partnership and the Contributor shall
cooperate in the joint defense of such Third Party Claim and shall offer to each
other such assistance as may reasonably be requested in order to ensure the
proper and adequate defense of any such matter.  Such joint defense shall be
under the general management and supervision of the party which is expected to
bear the greater share of the liability, unless otherwise agreed; provided,
however, that neither party shall settle or compromise any such joint defense
matter without the consent of the other, which consent shall not be unreasonably
withheld or delayed.  Any uninsured costs of such joint defense shall be borne
as the parties may agree, provided, however, that in the absence of such
agreement, the defense costs shall be borne by the party incurring such costs;
provided, further, that, if it is determined that one party was entitled to
indemnification under this Section 6, the other party shall reimburse the party
entitled to indemnification for all of its costs incurred in connection with
such defense.

     6.4   Subrogation.  In the event of any payment by an Indemnifying Party to
an Indemnified Party in connection with any Liability, the Indemnifying Party
shall be subrogated to and shall stand in the place of the Indemnified Party as
to any events or circumstances in respect of which the Indemnified Party may
have any right or claim against any third party relating to such event or
indemnification.  The Indemnified Party shall cooperate with the Indemnifying
Party in any reasonable manner in prosecuting any subrogated claim.

     6.5   Claims for HSE Work.  Notwithstanding the other provisions of this
Section 6, in the case of any assertion, claim or demand requiring the
performance of investigatory, removal or remedial work with respect to
(environmental conditions, HSE Laws or Chemical Substances for which the
Partnership may seek indemnification, the Partnership shall have the right to
conduct and 

                                      -30-
<PAGE>
 
control such work provided (i) it uses its good faith, commercially reasonable
efforts to achieve the Lowest Cost Response and (ii) it provides the Contributor
with the opportunity to: (A) review and comment upon any work plans for any
remedial action prior to finalization and implementation; (B) attend meetings
with regulators concerning the remedial action; and (C) have a representative
present during the performance of any remedial action.

     6.6   EXTENT OF INDEMNIFICATION. WITHOUT LIMITING OR ENLARGING THE SCOPE OF
THE INDEMNIFICATION, RELEASE AND ASSUMPTION OBLIGATIONS SET FORTH HEREIN, TO THE
FULLEST EXTENT PERMITTED BY LAW, AN INDEMNIFIED PARTY SHALL BE ENTITLED TO
INDEMNIFICATION HEREUNDER IN ACCORDANCE WITH THE TERMS HEREOF, REGARDLESS OF
WHETHER THE INDEMNIFIABLE LOSS GIVING RISE TO ANY SUCH INDEMNIFICATION
OBLIGATION IS THE RESULT OF THE SOLE, GROSS, ACTIVE, PASSIVE, CONCURRENT OR
COMPARATIVE NEGLIGENCE, STRICT LIABILITY OR OTHER FAULT OR VIOLATION OF ANY LAW
OF OR BY ANY SUCH INDEMNIFIED PARTY. THE PARTIES AGREE THAT THIS STATEMENT
CONSTITUTES A CONSPICUOUS LEGEND.


                                   SECTION 7
                                 MISCELLANEOUS

     7.1   Construction.  In construing this Agreement, the following principles
shall be followed:  (i) no consideration shall be given to the captions of the
articles, sections, subsections or clauses, which are inserted for convenience
in locating the provisions of this Agreement and not as an aid in construction:
(ii) no consideration shall be given to the fact or presumption that any of the
parties had a greater or lesser hand in drafting this Agreement; (iii) examples
shall not be construed to limit, expressly or by implication, the matter they
illustrate; (iv) the word "includes" and its syntactic variants mean "includes,
but is not limited to" and corresponding syntactic variant expressions; (v) the
plural shall be deemed to include the singular, and vice versa; (vi) each gender
shall be deemed to include the other gender; and (vii) each exhibit, appendix,
attachment and schedule to this Agreement is a part of this Agreement.

     7.2   Payment of Certain Expenses and Taxes.

     (a)   Subject to the further provisions of this Section 7.2, the
Contributor shall be responsible for all Taxes attributable to the Contributor's
ownership or use of the Assets or operation of the Contributed Business prior to
the Closing and the Partnership shall be responsible for all Taxes attributable
to the Partnership's ownership or use of the Assets or operation of the
Contributed Business after the Closing. The Contributor shall be responsible for
any liability of the Partnership pursuant to Texas Tax Code Section 111.020
(including interest, penalties and attorneys' fees in connection therewith) with
respect to any amounts owed or owing by the Contributor under Title 2, Texas Tax
Code.

                                      -31-
<PAGE>
 
     (b)   All sales, transfer, or other similar taxes incurred in connection
with the transfer of the Assets shall be borne by the Partnership.  The
Partnership, the Contributor and the Contributing Partner shall cooperate fully
with each other after the Closing in connection with (i) the preparation and
filing of any tax return, exemption certificate, or other filing in connection
with such taxes, and (ii) any audit examination by any taxing Authority of the
tax returns, exemption certificates, or other filings referred to above.

     (c)   All real property taxes, personal property taxes, ad valorem taxes,
and other similar taxes (or payments in lieu of such taxes) assessed on any of
the Assets in the tax period in which the Closing Date occurs (other than the
Inventory Taxes referred to in Section 7.2(d) below) ("Property Taxes") shall be
prorated between the Partnership and the Contributor as of the Closing.

     (d)   All real property taxes, personal property taxes, ad valorem taxes,
and other similar taxes (or payments in lieu of such taxes) assessed on the
Inventory or Stores Inventory in the tax period in which the Closing Date occurs
("Inventory Tax") shall be payable by the Contributor.

     (e)   The Partnership shall pay any title or recordation fees in connection
with the transfer of the Assets.  The Partnership shall also pay for any title
insurance policies or surveys of the Fee Interests that are requested or ordered
by the Partnership.

     (f)   After the Closing, the Contributor receiving each Property Tax or
Inventory Tax bill or notice applicable to the Assets for the period in which
the Closing Date occurred shall promptly notify the Partnership and shall pay
each such tax bill prior to the last day such taxes may be paid without penalty
or interest.  The Partnership shall promptly on receipt of a written request
(accompanied by appropriate supporting documentation) reimburse the paying party
with respect to the Partnership's share of such amount so paid as provided under
this Agreement.  The Contributor and the Partnership shall cooperate fully with
each other on and after Closing with respect to any Property Tax assessment or
valuation (or protest in connection therewith) by any taxing Authority with
respect to the tax period in which the Closing Date occurs.

     (g)   If either party receives a refund of any Taxes for which the other is
liable or responsible under this Agreement, the party receiving such refund
shall, within 30 days after the receipt of such refund, remit it to the party
who is liable.

     (h)   Notwithstanding any other provision of this Agreement, the
obligations of the parties set forth in this Section 7.2 shall be unconditional
and absolute and shall remain in effect until audit, assessment and collection
of any such taxes are barred by the applicable statute of limitations.

     7.3   Notices.  All notices, requests, demands and other communications
which are required or may be given under this Agreement shall unless otherwise
provided for elsewhere in this Agreement, be in writing and shall be deemed to
have been duly given if and when (i) transmitted by telecopier facsimile with
proof of confirmation from the transmitting machine, or (ii) delivered by
courier or other hand delivery, as follows:

                                      -32-
<PAGE>
 
     (a)   If to the Contributor:

           Millennium Petrochemicals Inc.
           c/o Millennium Chemicals Inc.
           99 Wood Avenue South
           Iselin, New Jersey 08830
           Attention: George H. Hempstead, III
           Telecopy Number: (908) 603-6857

     (b)   If to the Contributing Partner:

           Millennium Petrochemicals LLC LP
           c/o Millennium Chemicals Inc.
           99 Wood Avenue South
           Iselin, New Jersey 08830
           Attention: George H. Hempstead, III
           Telecopy Number: (908) 603-6857

     (c)   If to the Partnership:

           Equistar Chemicals, LP
           1221 McKinney Street
           Houston, Texas 77010
           Attention: Gerald A. O'Brien
           Telecopy Number: (713) 309-4718

or to such other address or telecopy number as either party shall have specified
by notice in writing to the other party.  All such notices, requests, demands
and communications shall be deemed to be effective upon receipt.

     7.4   [Reserved].

     7.5   Binding Effect; Benefit. Subject to Section 7.7, this Agreement shall
inure to the benefit of and be binding upon the parties hereto and their
respective permitted successors and assigns. Nothing in this Agreement,
expressed or implied, is intended to confer on any Person other than the parties
hereto or their respective permitted successors and assigns, any rights,
remedies, obligations or liabilities under or by reason of this Agreement.

     7.6   Occasional and Bulk Sales.  To the extent applicable, the Partnership
and the Contributor each agree to waive, to the fullest extent permitted by law,
compliance by the other with the provisions of the Bulk Sales Law of any
jurisdiction.

                                      -33-
<PAGE>
 
     7.7   Assignability.  Neither this Agreement nor any of the rights or
obligations hereunder shall be assignable (by operation of law or otherwise) by
the Contributor or the Contributing Partner without the prior written consent of
the Partnership or shall be assignable (by operation of law or otherwise) by the
Partnership (except to a wholly-owned subsidiary thereof) without the prior
written consent of the Contributor.  Any assignment or purported assignment in
violation of this Section shall be null and void.

     7.8   Amendment; Waiver.  This Agreement may be amended, supplemented or
otherwise modified only by a written instrument executed by the parties hereto.
No waiver by any party of any of the provisions hereof shall be effective unless
explicitly set forth in writing and executed by the party so waiving.  Subject
to the agreements and obligations of the Partnership hereunder or under
applicable Legal Requirements, no investigations by the Partnership heretofore
or hereafter made shall affect the representations and warranties of the
Contributor, and, except as otherwise provided in Section 6.1, such
representations and warranties shall survive any such investigation.  The waiver
by any party hereto of a breach of any provision of this Agreement shall not
operate or be construed as a waiver of any subsequent breach.

     7.9   Dispute Resolution.  All disputes under this Agreement shall be
resolved in accordance with the Dispute Resolution Procedures set forth in
Appendix A.

     7.10  Severability.  In the event that any provisions of this Agreement
shall finally be determined to be unlawful, such provision shall, so long as the
economic and legal substance of the transactions contemplated hereby is not
affected in any materially adverse manner as to Contributor, the Contributing
Partner or the Partnership, be deemed severed from this Agreement and every
other provision of this Agreement shall remain in full force and effect.

     7.11  Counterparts.  This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original and all of which
together shall be deemed to be one and the same instrument.

     7.12  APPLICABLE LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF DELAWARE EXCLUDING CONFLICTS OF LAW
PRINCIPLES OF SUCH JURISDICTION EXCEPT TO THE EXTENT SUCH MATTERS ARE
MANDATORILY SUBJECT TO THE LAWS OF ANOTHER JURISDICTION PURSUANT TO THE LAWS OF
SUCH OTHER JURISDICTION.

     7.13  JURISDICTION; CONSENT TO SERVICE OF PROCESS; WAIVER.  ANY JUDICIAL
PROCEEDING BROUGHT AGAINST ANY PARTY TO THIS AGREEMENT OR ANY DISPUTE UNDER OR
ARISING OUT OF OR IN CONNECTION WITH THIS AGREEMENT OR ANY MATTER RELATED HERETO
SHALL BE BROUGHT IN THE FEDERAL OR STATE COURTS OF THE STATE OF DELAWARE, AND,
BY EXECUTION AND DELIVERY OF THIS AGREEMENT, EACH OF THE PARTIES TO THIS
AGREEMENT ACCEPTS THE EXCLUSIVE JURISDICTION OF SUCH COURTS AND IRREVOCABLY

                                      -34-
<PAGE>
 
AGREES TO BE BOUND BY ANY JUDGMENT (AS FINALLY ADJUDICATED) RENDERED THEREBY IN
CONNECTION WITH THIS AGREEMENT EXCEPT TO THE EXTENT THIS AGREEMENT RELATES TO
THE CONVEYANCE OR ASSIGNMENT OF ANY INTEREST IN REAL ESTATE OR THE CREATION,
PERFECTION, PRIORITY OR FORECLOSURE OF ANY LIEN ON ANY INTEREST IN REAL ESTATE
IN WHICH CASE, SUCH COURTS JURISDICTION SHALL BE NON-EXCLUSIVE.  EACH OF THE
PARTIES TO THIS AGREEMENT SHALL APPOINT THE CORPORATION TRUST COMPANY, THE
PRENTICE-HALL CORPORATION SYSTEM, INC. OR A SIMILAR ENTITY (THE "AGENT") AS
AGENT TO RECEIVE  ON ITS BEHALF SERVICE OF PROCESS IN ANY PROCEEDING IN ANY SUCH
COURT IN THE STATE OF DELAWARE BY ENTERING INTO AN AGREEMENT AS OF THE DATE OF
THIS AGREEMENT WITH THE AGENT TO SUCH EFFECT.  THE FOREGOING CONSENTS TO
JURISDICTION AND APPOINTMENTS OF AGENT TO RECEIVE SERVICE OF PROCESS SHALL NOT
CONSTITUTE GENERAL CONSENTS TO SERVICE OF PROCESS IN THE STATE OF DELAWARE FOR
ANY PURPOSE EXCEPT AS PROVIDED ABOVE AND SHALL NOT BE DEEMED TO CONFER RIGHTS ON
ANY PERSON OTHER THAN THE PARTIES  HERETO.  EACH PARTY HEREBY WAIVES ANY
OBJECTION IT MAY HAVE BASED UPON LACK OF PERSONAL JURISDICTION, IMPROPER VENUE
OR FORUM NON CONVENIENS.

     7.14  WAIVER OF JURY TRIAL.  THE PARTNERSHIP, THE CONTRIBUTING PARTNER AND
THE CONTRIBUTOR HEREBY KNOWINGLY AND INTENTIONALLY, IRREVOCABLY AND
UNCONDITIONALLY WAIVE TRIAL BY JURY IN ANY LEGAL ACTION OR PROCEEDING RELATING
TO THIS AGREEMENT AND FOR ANY COUNTERCLAIM THEREIN.

                                      -35-
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement as of the date first above written.



                              MILLENNIUM PETROCHEMICALS INC.,
                              a Virginia corporation.


                              By: /s/ George H. Hempstead, III
                                 --------------------------------
                              Name:   George H. Hempstead, III
                              Title:  Vice President


                              MILLENNIUM PETROCHEMICALS LP LLC,
                              a Delaware limited liability company.

                              By: MILLENNIUM PETROCHEMICALS INC.,
                                  a Virginia corporation, Manager.


                              By: /s/ George H. Hempstead, III
                                 --------------------------------
                              Name:   George H. Hempstead, III
                              Title:  Vice President


                              EQUISTAR CHEMICALS, LP,
                              a Delaware limited partnership.



                              By: /s/ Debra L. Starnes
                                 --------------------------------
                              Name:   Debra L. Starnes
                              Title:  Senior Vice President
<PAGE>
 
                                  SCHEDULE A


     Millennium Petrochemicals will contribute to the Partnership the
Contributed Business, which consists of the production, distribution and sale of
ethylene, polyethylene and related products, polypropylene and other performance
polymers and ethyl alcohol. Its plants are located in Clinton, Iowa; Crockett,
Texas; LaPorte, Texas; Port Arthur, Texas; Chocolate Bayou, Texas; Tuscola,
Illinois; Morris, Illinois; Fairport Harbor, Ohio; Heath, Ohio; Newark, New
Jersey and Anaheim, California, and its research facilities are located in
Cincinnati, Ohio and Morris, Illinois.

     A more complete description of these businesses which are owned and
operated by Millennium Petrochemicals is included in Millennium's Annual Report
on Form 10-K for the year ended December 31, 1996 and Millennium's Quarterly
Reports on Form 10-Q for the quarters ended March 31, 1997.
<PAGE>
 
                                Schedule 2.1(a)

                                 Fee Interests



ANAHEIM PLANT                               MORRIS PLANT
1045 North Kemp Street                      8805 N. Tabler Road
P.O. Box 150                                Morris, IL  60450
Anaheim, CA  92801                          Grundy County
Orange County

CHOCOLATE BAYOU PLANT                       MORRIS PRC
P.O. Box 4000                               8935 N. Tabler Road
(2 Miles South of FM 2917                   Morris, IL  60450
   on FM 2004)                              Grundy County
Alvin, TX  77511
Brazoria County

CLINTON PLANT                               NEWARK PLANT
Highway 30 West                             300 Doremus
P.O. Box 2919                               Newark, NJ  07105
Clinton, IA  52733                          Essex County
Clinton County

CROCKETT PLANT                              PORT ARTHUR PLANT
Highway US 287 & FM 2160                    Highway 73 East
P.O. Box 1038                               P.O. Box 848
Latexo, TX  75849                           Port Arthur, TX  77640
Austin County                               Jefferson County

HEATH PLANT                                 TUSCOLA PLANT
1855 James Parkway                          625 East U.S. Highway 36
Heath, OH  43056                            Tuscola, IL  61953
Licking County                              Champaign & Douglas Counties

LA PORTE COMPLEX                            ALLEN RESEARCH CENTER
1515 Miller Cut-Off Road                    11514 Northlake Drive
P.O. Drawer D                               Cincinnati, OH  45249
LaPorte, TX  77571                          Hamilton County
Harris County
<PAGE>
 
                                Schedule 2.1(b)

                                    Leases

PLANT PROPERTY                              Cleveland, OH  44127   
                                                              
FAIRPORT HARBOR PLANT                       SALES OFFICES     
110 Third Street                                              
Fairport Harbor, OH  44077                  ATLANTA SALES OFFICE
                                            EBC Office Center 
TUSCOLA PLANT - WASTEWATER TREATMENT        3675 Crestwood Parkway, Suite 400
625 East U.S. Highway 36                    Duluth, GA  30136 
Tuscola, IL  61953                                            
c/o Blaine Benner                           PENNSYLVANIA SALES OFFICE/1/ 
2171 Holiday Drive                          705 Hyde Park     
Tuscola, IL  77095                          Doylestown, PA  18901
                                                              
CLINTON PLANT - DAC FACILITIES              CHICAGO SALES OFFICE
Highway US 287 & FM 2160                    473 Dunham Road, Suite 212
P.O. Box 1038                               St. Charles, IL  60174
Latexo, TX  75849                                             
c/o Public Works Department                 CALIFORNIA SALES OFFICE
City Hall                                   18101 Von Karman Ave., Suite 350
611 South Third Street                      Irvine, CA  92612 
Clinton, IA  52732                                            
                                            HYDROCARBONS OFFICE
LAPORTE COMPLEX - METERING STATION          1155 Dairy Ashford Road, Suite 208
1515 Miller Cut-Off Road                    Houston, TX  77079
LaPorte, TX  77571                                            
c/o Shell Pipeline Corporation              DISTRIBUTION CENTERS
Two Shell Plaza                                               
Houston, TX  77252                          A&R Transport Inc.
                                            San Bernadino, CA 
TUSCOLA PLANT - ANTENNA                                       
625 East U.S. Highway 36                    Dameo Regional Distribution Center
Tuscola, IL  61953                          568 Central Avenue
c/o Trunkline Gas Company                   Bridgewater, NJ  08807
3000 Bissonnet Ave.                                           
Houston, TX  77001                          Excel Logistics   
                                            501 West Schrock Road
WAREHOUSE                                   Westerville, OH  43081
                                                              
Kealy Trucking                              Seapac, Inc.      
6707 Bessezner Ave.                         4000 Cedar Blvd.


                                     -39-
<PAGE>
 
Baytown, TX  77522 

Seapac, Inc.
4601 Welcome All Road
Atlanta, GA  30349




                                     -40-
<PAGE>
 
__________________
/1/  Lease assigned to Dr. Christine DiCello; 7012 Hyde Park; 
     Doylestown, PA  18901
                                Schedule 2.1(d)

                                   Equipment

     The equipment set forth in the Equipment Listing dated September 30, 1997,
including all additions and deletions up to December 1, 1997, copies of which
have been initialed by representatives of the Contributor and the Partnership.



                                     -41-
<PAGE>
 
                                Schedule 2.1(k)

                           Contributed Subsidiaries


     Quantum Pipeline Company



                                     -42-
<PAGE>
 
                                Schedule 2.2(c)

              Excluded names, logos, tradenames, trademarks, etc.

All trade names, marks or logos containing or associated with any of the
following:

MILLENNIUM

MILLENNIUM logotype

"M in oval design" logotype

QUANTUM

QUANTUM logotype



                                     -43-
<PAGE>
 
                                Schedule 2.2(h)

                            Certain Excluded Assets

     (i) Millennium's corporate office and data center located in Cincinnati,
Ohio and all equipment, personal property and fixtures associated therewith;
(ii) the cafeteria/conference center adjacent to Millennium's office and data
center in Cincinnati, Ohio and all equipment, personal property and fixtures
associated therewith; (iii) assets associated with the ongoing corporate
operations of Millennium Petrochemicals and its direct and indirect corporate
parents, including equipment, records, computer hardware and software and other
personal property and fixtures; (iv) assets associated with the businesses
described under the headings "Millennium Petrochemicals--Acetyls and Ethyl
Alcohol--Acetic Acid and VAM" and "--Methanol" in its 1996 Annual Report on Form
10-K, as such businesses are being conducted on the date of this Agreement (the
"Acetyls Business") and located within the boundaries of the Acetic Acid, VAM
and Methanol (including Syngas) production facilities at Millennium
Petrochemicals' LaPorte, Texas facility, as such boundaries are established by
agreement between Millennium Petrochemicals Inc. and Lyondell Petrochemical
Company before the Closing Date (the "Boundaries"); including without limitation
the waste water treatment plant and the barge dock at Millennium Petrochemicals'
LaPorte, Texas facility and associated equipment; (v) assets used or held for
use in the operation and conduct of the Acetyls  Business as such businesses are
being conducted on the date of this Agreement and not either (y) located within
the Boundaries or (z) provided to Millennium Petrochemicals under a Shared
Services Agreement; (vi) outstanding claims related to Millennium Petrochemicals
v. M.W. Kellogg Co., (vii) all subsidiaries of Millennium Petrochemicals other
than Quantum Pipeline Company, including without limitation CUE Insurance
Limited, DR Insurance Company, Millennium Plastics Inc., Millennium Polymers
Inc., Millennium Chemicals Export Ltd., Millennium Petrochemicals Canada, Ltd.,
NDCC International II Inc., USI Chemicals International, Inc., Quantum UK
Limited, Millennium Petrochemicals Europe B.V., and Suburban Propane GP, Inc.;
(viii) Millennium Petrochemical's interest in Suburban Propane Partners, L.P.
and any entities controlled by it; (ix) Millennium Petrochemical's former
research laboratories on Section Road, Cincinnati, Ohio, (x) the unimproved real
estate at Millennium Petrochemicals' LaPorte, Texas facility proximate to the
real estate retained by Millennium Petrochemicals under (iv) above, more
particularly described in the Letter Agreement concerning Expansion Land of even
date herewith between the Partnership and Contributor (xi) Accounts Receivable
of the Contributor as of the Closing Date, (xii) the assets of Millennium (or
its Affiliates) that are covered by a Shared Service Agreement in which the
service is to be provided by Millennium (or its Affiliates) to the Partnership
and (xiii) the real estate at Millennium Petrochemicals' LaPorte, Texas facility
leased to Amoco pursuant to a long term lease for Amoco's PAO facility.
<PAGE>
 
                             Schedule 2.5(a)(vii)

                             Assumed Indebtedness

The Millennium Debt as defined in the Master Transaction Agreement



                                     -45-
<PAGE>
 
                              Schedule 2.5(a)(x)

                         Assumed Long-term Liabilities


The following liabilities related to (i) the operations of the Contributed
Business or (ii) employees who will become employees of the Partnership:

       Unfunded health care and life insurance Post-retirement benefits


                                     -46-
<PAGE>
 
                                  Schedule 3

                              Disclosure Schedule


     The Contributor makes no exceptions to the representations and warranties
made by it in Section 3 of this Agreement except for the following exception to
its representations made in Section 3.4 of this Agreement:

     Millennium Chemicals Inc. ("Millennium") has received a letter from the
Pension Benefit Guaranty Corporation (the "PBGC") dated September 10, 1997
expressing a concern that the actions contemplated by the Agreement would
increase the risk to the PBGC relating to the Millennium Defined Benefit Plans.
In that letter, the PBGC noted that it could seek to involuntarily terminate the
Plan prior to the Closing Date if it determined that the transaction would cause
the risk to the PBGC to increase unreasonably. The letter went on to state that
this measure would be viewed as a last resort and that the PBGC would prefer to
enter into a consensual agreement to protect the Plan.

     Millennium has provided the PBGC with information explaining the
transaction pursuant to a Confidentiality Agreement with the PBGC. In addition,
Millennium has spoken with representatives at the PBGC regarding the transaction
and the PBGC and Millennium have executed an agreement for which, in
consideration of Millennium agreeing to certain covenants, the PBGC agreed to
forbear from instituting proceedings to terminate the Plans.



                                     -47-
<PAGE>
 
                                  Appendix A

                         Dispute Resolution Procedures


     (1)  Binding and Exclusive Means.  The dispute resolution provisions set
forth in this Appendix A shall be the binding and exclusive means to resolve all
disputes arising under this Agreement (each a "Dispute").

     (2)  Standards and Criteria.  In resolving any Dispute, the standards and
criteria for resolving such dispute shall, unless the Contributor and the
Partnership in their discretion jointly stipulate otherwise, be as set forth in
Appendix 1 to this Appendix A.

     (3)  ADR and Binding Arbitration Procedures.  If a Dispute arises, the
following procedures shall be implemented:

     (a)  The Indemnifying Party may at any time invoke the dispute resolution
procedures set forth in this Appendix A as to any Dispute by providing written
notice of such action to the Indemnified Party, who within five Business Days
after such notice shall schedule a meeting to be held in Houston, Texas between
the parties.  The meeting shall occur within 10 Business Days after notice of
the meeting is delivered to the Indemnifying Party.  The meeting shall be
attended by representatives of each party having decision-making authority
regarding the Dispute as well as the dispute resolution process and who shall
attempt in a commercially reasonable manner to negotiate a resolution of the
Dispute.

     (b)  The representatives of the parties shall cooperate in a commercially
reasonable manner and shall explore whether techniques such as mediation,
minitrials, mock trials or other techniques of alternative dispute resolution
might be useful.  In the event that a technique of alternative dispute
resolution is so agreed upon, a specific timetable and completion date for its
implementation shall also be agreed upon.  The representatives will continue to
meet and discuss settlement until the date (the "Interim Decision Date") that is
the earliest to occur of the following events: (i) an agreement shall be reached
by the parties resolving the Dispute; (ii) one of the parties shall determine
and notify the other party in writing that no agreement resolving the Dispute is
likely to be reached; (iii) if a technique of alternative dispute resolution is
agreed upon, the completion date therefor shall occur without the parties having
resolved the Dispute; or (iv) if another technique of alternative dispute
resolution is not agreed upon, two full meeting days (or such other time period
as may be agreed upon) shall expire without the parties having resolved the
Dispute.

     (c)  If, as of the Interim Decision Date, the parties have not succeeded in
negotiating a resolution of the dispute pursuant to subsection (b), the parties
shall proceed under subsection (d).

     (d)  The parties shall jointly appoint a Neutral.  If the parties have been
unable to agree upon such appointment within 30 days after the Interim Decision
Date, then such Neutral, upon the 
<PAGE>
 
application of either of the parties shall be appointed within 10 days of the
filing of such application by the Center for Public Resources, or if such
appointment is not so made promptly then promptly thereafter by the American
Arbitration Association in Philadelphia, Pennsylvania, or if such appointment is
not so made promptly then promptly thereafter by the senior United States
District Court judge sitting in Wilmington, Delaware. The fees of the Neutral
shall be paid equally by the parties except that the Neutral shall have
discretion to award fees.

     (e)  In consultation with the Neutral, the parties shall agree upon a
binding schedule and procedure (which procedure may have been previously
discussed under subsection (b)) to be used as a means to resolve or to attempt
to resolve Dispute, with the Neutral making the decision as to the schedule
and/or procedure if the parties have been unable to agree on any of such matters
within 20 days after the initial selection of the Neutral.  The parties agree to
participate in a commercially reasonable manner in the procedure to its
conclusion as determined by the Neutral.  If the parties are not successful in
resolving the Dispute through the procedure described above, then the parties
agree that (i) the Neutral shall act as the arbitrator in a binding arbitration
in accordance with the American Arbitration Association rules and shall render a
decision and (ii) judgment upon the decision rendered by the Neutral may be
entered in any court having jurisdiction.

     (4)  Continuation of Business. Notwithstanding the existence of any Dispute
or the pendency of any procedures pursuant to this Appendix A, the parties agree
and undertake that all payments not in dispute shall continue to be made and all
obligations not in dispute shall continue to be performed.



                                      -2-
<PAGE>
 
                                  Appendix 1


     (a)  First priority shall be given to maximizing the consistency of the
resolution of the Dispute with the satisfaction of all express obligations of
the parties and their Affiliates as set forth in the Agreement.

     (b)  Second priority shall be given to resolution of the Dispute in a
manner which best achieves the objectives of the business activities and
arrangements under the Agreement and permits the parties to realize the benefits
intended to be afforded thereby.

     (c)  Third priority shall be given to such other matters, if any, as the
parties or the Neutral shall determine to be appropriate under the
circumstances.



                                      -3-

<PAGE>
 
                                                                   EXHIBIT 10.27




                               PARENT AGREEMENT



                                     AMONG



                        LYONDELL PETROCHEMICAL COMPANY,



                           MILLENNIUM CHEMICALS INC.



                          AND EQUISTAR CHEMICALS, LP
<PAGE>
 
                               TABLE OF CONTENTS



                                                                       PAGE

SECTION 1  GUARANTEE OF OBLIGATIONS...................................   2
 
      1.1  Guarantee..................................................   2
      1.2  Guarantee Regarding Interested Owner Agreements............   2
      1.3  No Demand or Notice........................................   3
      1.4  Waiver of Resort to Security...............................   3
      1.5  No Discharge...............................................   3
      1.6  Waivers by the Parent......................................   3
      1.7  No Reduction...............................................   4
      1.8  Enforcement................................................   4
      1.9  Continued Effectiveness....................................   4
     1.10  Certain Defenses...........................................   4
     1.11  Parties in Interest........................................   4
 
SECTION 2  OWNERSHIP AND BUSINESS OF PARTNER SUBS.....................   5
 
      2.1  Restrictions on Transfer and Pledge of Partner Sub Stock...   5
      2.2  Right of First Option......................................   6
      2.3  Prohibition on Affiliated Obligor Bankruptcy, Etc..........   8
      2.4  Special Purpose Subsidiaries...............................   8
 
SECTION 3  STANDSTILL AGREEMENT.......................................   8
 
      3.1  Standstill.                                                   8
      3.2  Exceptions.................................................   9
 
SECTION 4  MISCELLANEOUS..............................................  10
 
      4.1  No Waivers.................................................  10
      4.2  Expenses in Connection with Exercise.......................  10
      4.3  Subordination..............................................  10
      4.4  Confidentiality and Use of Information.....................  10
      4.5  Competing Businesses.......................................  10
      4.6  Further Assurances.........................................  11
      4.7  Successors and Assigns.....................................  11
      4.8  Benefits of Agreement Restricted to the Parties............  11
      4.9  Notices                                                      11
     4.10  Severability...............................................  12
     4.11  Termination................................................  12
     4.12  Construction and Certain Definitions.......................  12
     4.13  Counterparts...............................................  13
     4.14  Governing Law..............................................  13
     4.15  Jurisdiction; Consent to Service of Process; Waiver........  13
     4.16  Waiver of Jury Trial.......................................  13
     4.17  Dispute Resolution.........................................  13
     4.18  Amendment..................................................  13

                                      -i-
<PAGE>
 
APPENDICES

Appendix A    List of Related Agreements
Appendix B    Dispute Resolution Procedures


                                     -ii-
<PAGE>
 
                               PARENT AGREEMENT


     This Parent Agreement (this "Agreement") is made as of this 1st day of
December, 1997 among Lyondell Petrochemical Company, a Delaware corporation
("Lyondell"), Millennium Chemicals Inc., a Delaware corporation ("Millennium"
and, together with Lyondell, the "Parents")  and Equistar Chemicals, LP, a
Delaware limited partnership (the "Partnership").

     WHEREAS, Lyondell and Millennium entered into the Master Transaction
Agreement dated as of July 25, 1997, as amended (the "Master Transaction
Agreement").

     WHEREAS, Lyondell Petrochemical G.P. Inc. ("Lyondell GP") and Lyondell
Petrochemical L.P. Inc. ("Lyondell LP" and, together with Lyondell GP, the
"Lyondell Partner Subs") are both Delaware corporations and direct or indirect
wholly owned subsidiaries of Lyondell.

     WHEREAS, Millennium Petrochemicals GP LLC ("Millennium GP") and Millennium
Petrochemicals LP LLC ("Millennium LP" and, together with Millennium GP, the
"Millennium Partner Subs") are both Delaware limited liability companies and
direct or indirect wholly owned subsidiaries of Millennium.

     WHEREAS, pursuant to the terms of the Master Transaction Agreement, the
Partnership  has been formed under the laws of the State of Delaware pursuant to
the Limited Partnership Agreement being entered into simultaneously herewith (as
it may in the future be amended, supplemented, restated or otherwise modified or
amended, the "Partnership Agreement"), with Lyondell GP and Millennium GP as the
general partners and Lyondell LP and ML Partner as the limited partners of the
Partnership.  The Lyondell Partner Subs, together with any other direct or
indirect subsidiary of Lyondell that is a party to any of the Related Agreements
(as defined herein), are referred to herein as the "Lyondell Affiliated
Obligors."  The Millennium Partner Subs, together with any other direct or
indirect subsidiary of Millennium that is a party to any of the Related
Agreements, are referred to herein as the "Millennium Affiliated Obligors."  The
Lyondell Affiliated Obligors and the Millennium Affiliated Obligors,
collectively or individually as the context may require, are referred to herein
as the "Affiliated Obligors."  The Lyondell Partner Subs and the Millennium
Partner Subs, collectively or individually as the context may require, are
referred to herein as the "Partner Subs."

     WHEREAS, in connection with the closing of the transactions to be effected
pursuant to the Master Transaction Agreement, the Parents and certain of their
respective affiliates, have entered into or are entering into various agreements
and other legal documents, including the Partnership Agreement, services
agreements and asset contribution agreements (including this Agreement, the
"Related Agreements"), each of which is integrally related to the capitalization
and future operations of the Partnership and is listed on Appendix A hereto.
The Related Agreements (other than this Agreement) and any additional agreements
that may from time to time be added to Appendix A hereto by agreement of the
Parents, as they may in the future be amended, supplemented, restated or
otherwise modified, are referred to herein as the "Other Agreements".
<PAGE>
 
     WHEREAS, this Agreement is essential to the consummation of the closing
pursuant to the Master Transaction Agreement and the entering into and
effectiveness of the Other Agreements, and each of the parties to such
agreements is relying on this Agreement in connection with entering into each of
the Other Agreements.

     WHEREAS, in order to induce the parties thereto to enter into the Other
Agreements, each  Parent is willing, solely for the benefit of the Beneficiaries
(as defined below in Section 1.11) and their successors and assigns, to
guarantee the performance by its Affiliated Obligors of the obligations of such
Affiliated Obligors as set forth in this Agreement.

     WHEREAS, each Parent is willing to subject the Partner Sub Stock (as
defined herein) to certain restrictions on transfer, as set forth in this
Agreement.

     NOW THEREFORE, in, consideration of the foregoing and the mutual promises
and covenants of the parties hereto, the Parents and the Partnership hereby
agree as follows:

                                   SECTION 1
                           GUARANTEE OF OBLIGATIONS
 
     1.1   Guarantee.  Each Parent hereby unconditionally, absolutely and
irrevocably guarantees, undertakes and promises to cause, as herein provided,
the due and punctual payment and the full and prompt performance by its
Affiliated Obligors of all of the amounts to be paid and all of the terms and
provisions to be performed or observed by or on the part of its Affiliated
Obligors under the Other Agreements in accordance with the terms thereof (all
such terms and provisions as now or hereafter in existence being collectively
called the "Obligations") as follows: in the event that its Affiliated Obligors
shall fail in any manner whatsoever to pay, perform or observe any of their
Obligations, when and as the same shall be required to be paid, performed or
observed under the terms of the Other Agreements, such Parent will itself duly
and punctually pay, or fully and promptly perform or observe, as the case may
be, such Obligations, or cause the same to be duly and punctually paid, or fully
and promptly performed or observed, in each case as if such Parent were itself
the obligor with respect to such Obligations under the Other Agreements. Insofar
as this Section 1.1 relates to the obligations of an Affiliated Obligor under
the Partnership Agreement and except as set forth in Section 1.2, no Parent
shall be required to make, or cause a Partner Sub to make, any contribution to
the Partnership that such Partner Sub is not otherwise required to make pursuant
to the terms of Section 2.3, 2.4, or 12.2(d)(ii) of the Partnership Agreement.
Insofar as this Section 1.1 applies to Other Agreements other than the
Partnership Agreement, the term "Affiliated Obligors" will not include the
Partnership nor any partner in the Partnership in its capacity as such.

     1.2   Guarantee Regarding Interested Owner Agreements.  Each Parent
acknowledges that the Partnership Agreement sets forth definitions of
"Conflicted Partner" and "Nonconflicted Partner," and provides that a
Nonconflicted Partner has certain exclusive rights to control the Partnership
with respect to any Conflict Circumstance (as defined in the Partnership
Agreement); and accordingly, without limiting the rights of its Partner Sub
under Section 6.8 of the Partnership Agreement, each Parent hereby agrees to
cause its Partner Sub (i) to cause the Partnership to pay, 

                                       2
<PAGE>
 
perform and observe all of the Obligations to be paid, performed or observed by
or on the part of the Partnership under the Other Agreements, in accordance with
the terms thereof, to the extent that such Partner Sub is the Nonconflicted
Partner and is thereby entitled to cause the payment, performance and observance
of such Obligations and (ii) to abide by its obligations as the Nonconflicted
Partner with respect to any Conflict Circumstance in accordance with the terms
of the Partnership Agreement applicable thereto; provided, however, that each
Parent's responsibility under this Section 1.2 for a failure of the Partnership
to pay, perform or observe its obligations under the Other Agreements shall be
limited to the circumstances in which the Partnership's failure to so pay,
perform or observe its obligations under the Other Agreements was directly
caused by an act or failure to act of its Partner Sub; provided, further, that
nothing in this Section 1.2 shall require a Parent to make or cause such Partner
Sub to make any contribution to the Partnership that such Partner Sub is not
otherwise required to make pursuant to Section 2.3, 2.4, or 12.2(d)(ii) of the
Partnership Agreement.

     1.3   No Demand or Notice.  It shall not be a condition to the guarantees
and agreements set forth in Sections 1.1 and 1.2 above (together, the
"Guarantee") that a Beneficiary shall have first made any request of or demand
upon, or given any notice of the occurrence of a default under the Other
Agreements or any other notice whatsoever to, either Parent or its Affiliated
Obligors or any other Person, or shall have instituted any action or proceeding
against any Affiliated Obligor or any other Person in respect thereof, or shall
have joined any Affiliated Obligor or the Partnership in any such action or
proceeding. A Beneficiary in asserting the benefit of the Guarantee shall give
prompt notice to a Parent of any failure by its Affiliated Obligors or the
Partnership to pay, perform or observe any Obligation; provided, however, that
any failure, delay or defect in the giving of such notice shall not alter or
affect the Guarantee under this Agreement.

     1.4   Waiver of Resort to Security.  Each Parent further agrees that this
Agreement, insofar as it constitutes a guarantee of monetary Obligations,
constitutes a guarantee of payment when due and not of collection, and each
Parent waives any right to require as a condition to its Guarantee that any
resort be had by a Beneficiary to any security held for the payment of any
Obligations.

     1.5   No Discharge.  The Guarantee is and shall remain absolute and
unconditional irrespective of any circumstance that might otherwise constitute a
legal or equitable discharge of a surety or guarantor, as the case may be, with
respect to its Guarantee.

     1.6   Waivers by the Parent.  Each Parent hereby waives, with respect to
the Guarantee but without prejudice to the rights of the parties to the several
Other Agreements, any notice of acceptance of this Agreement, grace,
presentment, demand, protest, notice of the occurrence of a default under the
Other Agreements and any other notice of any kind whatsoever and promptness in
making any claim or demand hereunder. The Guarantee shall not be affected by (i)
the failure of a Beneficiary to assert any claim or demand or to enforce any
right or remedy under the provisions of any of the Other Agreements or any
agreement related thereto or otherwise, (ii) any extension or renewal of any of
the Other Agreements or any agreement related thereto, (iii) any rescission,
waiver, amendment or modification of any of the terms or provisions of any of
the Other Agreements or of any agreement related thereto, including, without
limitation, any change in the time, manner 

                                       3
<PAGE>
 
or place of payment or performance of any of the obligations under the Other
Agreements, or (iv) the release of any security held for payment of any
Obligations.

     1.7   No Reduction.  The Guarantee shall not be subject to any reduction,
limitation, impairment or termination for any reason, including, without
limitation, any claim of waiver, release, surrender, alteration or compromise,
and shall not be subject to any defense or set-off, counterclaim, recoupment or
termination whatsoever, except as provided in Section 1.10.

     1.8   Enforcement.  Notwithstanding anything herein to the contrary, a
Beneficiary may proceed to enforce the Guarantee without first pursuing or
exhausting any right or remedy that it or any of its successors or assigns may
have against any Affiliated Obligor or either Parent or any other person.

     1.9   Continued Effectiveness.  The Guarantee shall continue to be
effective or be reinstated, as the case may be, if at any time payment, or any
part thereof, of any Obligation of an Affiliated Obligor is rescinded or must
otherwise be restored or returned by the Person receiving such payment upon the
insolvency, bankruptcy or reorganization of an Affiliated Obligor, all as though
such payment or part thereof had not been made.

     1.10  Certain Defenses.  Nothing herein is intended to deny to either
Parent, and it is expressly agreed that each Parent shall have and may assert,
any and all of the defenses, set-offs, counterclaims and other rights (other
than those relating to insolvency, bankruptcy or reorganization as described in
Section 1.9) with regard to any Obligations that its Affiliated Obligors may
possess except any defense its Affiliated Obligors may possess relating to lack
of validity or enforceability of the Other Agreements or any other agreement or
instrument relating thereto as against its Affiliated Obligors arising from the
defective incorporation or other defective organization of its Affiliated
Obligors, their lack of qualification to do business in any applicable
jurisdiction or their defective corporate or other organizational authority to
enter into, deliver or perform the Other Agreements.

     1.11  Parties in Interest.  This Agreement shall inure solely to the
benefit of the Beneficiaries, each of whom has the right to enforce the
Guarantee against the Parents, and nothing in this Agreement, express or
implied, is intended to or shall confer upon any other Person any rights,
benefits or remedies of any nature whatsoever under or by reason of this
Agreement. As used in this Agreement, "Beneficiaries" shall mean (i) as to any
obligations of Millennium hereunder, except for its obligations pursuant to
Section 1.1 hereof with respect to the Partnership Agreement, the Partnership,
Lyondell and the Lyondell Affiliated Obligors, (ii) as to any obligations of
Lyondell hereunder, except for its obligations pursuant to Section 1.1 hereof
with respect to the Partnership Agreement, the Partnership, Millennium and the
Millennium Affiliated Obligors, and (iii) as to any obligations of Millennium or
Lyondell pursuant to Section 1.1 hereof with respect to the Partnership
Agreement, Lyondell and Millennium, respectively. As used in this Agreement, the
term Parent includes any successor or transferee of the Parent, and the term
Affiliated Obligors includes any successor to or transferee of the Affiliated
Obligors' interest in the Partnership permitted pursuant to the Partnership
Agreement.

                                       4
<PAGE>
 
                                   SECTION 2
                    OWNERSHIP AND BUSINESS OF PARTNER SUBS
 
     2.1   Restrictions on Transfer and Pledge of Partner Sub Stock.  (a) Each
Parent agrees that except as otherwise provided below in this Section 2.1 or
Section 2.2 or with the written consent of the other Parent (or any Successor
Parent, as defined in Section 2.1(d)), which consent may be granted or withheld
in such Parent's sole discretion, it will not, in any transaction or series of
transactions, directly or indirectly, (i) sell, assign or otherwise in any
manner dispose of, whether by act, deed, merger or otherwise ("Transfer") or
(ii) mortgage, pledge, encumber or create or suffer to exist any pledge, lien or
encumbrance upon or security interest in ("Pledge"), all or any part of the
capital stock (including any securities convertible into or exchangeable for or
carrying any rights to purchase, subscribe for or otherwise acquire any such
capital stock) of its Partner Subs (collectively, the "Partner Sub Stock").
(Each of the defined terms "Transfer"and "Pledge" is used herein both as a noun
and as a verb.) Any attempt by a Parent to Transfer or Pledge all or a portion
of its Partner Sub Stock in violation of this Agreement shall be void ab initio
and shall not be effective to transfer such Partner Sub Stock or any portion
thereof. The Partnership Agreement contains provisions relating to the Transfer
and Pledge of the Partner Subs' direct interests in the Partnership.

     (b)   The Parent agrees that all certificates representing shares of
Partner Sub Stock, whether currently owned or hereafter acquired, shall carry
the following legend, which legend each Parent agrees to cause to be placed
thereon and to cause to remain thereon as long as such shares are subject to the
restrictions of this Agreement:

     THE SALE, ASSIGNMENT, PLEDGE OR OTHER TRANSFER OR HYPOTHECATION OF THE
     STOCK REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO CERTAIN RESTRICTIONS
     PURSUANT TO AND MAY NOT BE EFFECTED EXCEPT IN ACCORDANCE WITH THE
     PROVISIONS OF AN AGREEMENT BINDING UPON THE OWNER OF THE STOCK REPRESENTED
     HEREBY.  THE OWNER OR ISSUER WILL FURNISH A COPY OF SUCH AGREEMENT TO ANY
     PROPOSED TRANSFEREE OR PLEDGEE WITHOUT CHARGE UPON REQUEST.

     (c)   Without the need for the consent of any Person, any Parent may
Transfer its Partner Sub Stock to any wholly-owned Affiliate of such Parent.

     (d)   Each Parent may Transfer all (but not less than all) of its Partner
Sub Stock if such Transfer is in connection with (i) a merger, consolidation,
conversion or share exchange of such Parent or (ii) a sale or other disposition
of (x) the Partner Sub Stock plus (y) other assets representing at least fifty
percent (50%) of the book value of such Parent's assets excluding the Partner
Sub Stock, as reflected on its most recent audited consolidated (or combined)
financial statements; provided, however, the ultimate parent entity of the
acquiring, succeeding or surviving entity in any such transaction (the
"Successor Parent") (i) shall succeed to and be substituted for such Parent,
with the same effect as if it had been named herein and (ii) shall execute an
instrument wherein such ultimate parent entity shall agree to be bound by the
obligations of such Parent under this 

                                       5
<PAGE>
 
Agreement, with the same effect as if it had been named herein, whereupon,
unless such Parent shall become a direct or indirect subsidiary of the Successor
Parent, such Parent shall thereupon be released from all obligations hereunder.

     (e)   Nothing in this Agreement shall prevent the Transfer or Pledge of the
capital stock, equity ownership interests or other securities of a Parent, and
no such Transfer or Pledge of securities issued by a Parent shall be deemed to
constitute a Transfer or Pledge of Partner Sub Stock hereunder.

     (f)   Each Parent may Pledge all (but not less than all) of its Partner Sub
Stock to any one or more Approved Lenders; provided that the Pledge shall be
evidenced by an instrument, reasonably satisfactory to the Partnership, wherein
the Approved Lender receiving such Pledge shall agree that in the event such
Approved Lender obtains a right of foreclosure on such Parent's Partner Sub
Stock, such Approved Lender will foreclose on the Partner Sub Stock of each of
such Parent's Partner Subs equally so that such Approved Lender will in all
events hold equal portions of Partner Sub Stock of LG Partner and Lyondell LP or
Millennium GP and Millennium LP, as the case may be.  An "Approved Lender" shall
be any bank, insurance company, investment bank or other financial institution
that is regularly engaged in the business of making loans.

     2.2   Right of First Option.

           (a) Without the consent of the other Parent, neither Parent may
Transfer less than all of its Partner Sub Stock.  Unless such Transfer is
otherwise permitted by Section 2.1, any Parent desiring to Transfer (pursuant to
a cash sale) all of its Partner Sub Stock (the "Selling Parent") shall give
written notice (the "Initial Notice") to the Partnership and the other Parent
(the "Offeree Parent") stating that the Selling Parent desires to Transfer its
Partner Sub Stock and stating the cash purchase price and all other terms on
which it is willing to sell (the "Offer Terms").  Delivery of an Initial Notice
shall constitute the irrevocable offer of the Selling Parent to sell its Partner
Sub Stock to the Offeree Parent hereunder.

           (b) The Offeree Parent shall have the option, exercisable by
delivering written notice (the "Acceptance Notice") of such exercise to the
Selling Parent within 45 days of the date of the Initial Notice, to elect to
purchase all of the Partner Sub Stock of the Selling Parent on the Offer Terms
described in the Initial Notice.  The Acceptance Notice shall set a date for
closing the purchase, such date to be not less than 30 nor more than 90 days
after delivery of the Acceptance Notice; provided that such time period shall be
subject to extension as reasonably necessary (up to a maximum of an additional
120 days after such 90 day period) in order to comply with any applicable filing
and waiting period requirements under the Hart-Scott-Rodino Antitrust
Improvements Act.  The closing shall be held at the Partnership's offices.  The
purchase price for the Selling Parent's Partner Sub Stock shall be paid in cash
delivered at the closing.  The purchase shall be consummated by appropriate and
customary documentation (including the giving of representations and warranties
substantially similar to those set forth in Sections 2.1 through 2.4 of the
Master Transaction Agreement and customary representations and warranties
regarding the Selling Parent's title to its Partner Sub Stock).

                                       6
<PAGE>
 
           (c) If the Offeree Parent does not elect to purchase the Selling
Parent's Partner Sub Stock within 45 days after the receipt of the Initial
Notice, the Selling Parent shall have a further 180 days during which it may,
subject to Sections 2.2(d) and (e), consummate the sale of its Partner Sub Stock
to a third party purchaser at a purchase price and on such other terms that are
no more favorable to such purchaser than the Offer Terms.  If the sale is not
completed within such further 180-day period, the Initial Notice shall be deemed
to have expired and a new notice and offer shall be required before the Selling
Parent may make any Transfer of its Partner Sub Stock.

           (d) Before the Selling Parent may consummate a Transfer of its
Partner Sub Stock to a third party in accordance with this Agreement, the
Selling Parent shall demonstrate to the Partnership that such proposed purchaser
(or the Person willing to serve as its guarantor as contemplated by Section
2.2(f)) has outstanding indebtedness that is rated investment grade by either
Moody's Investor Services Inc. or Standard & Poor's Corporation, or if such
proposed purchaser (or such other Person) has no rated indebtedness outstanding,
such Person shall provide an opinion from a nationally recognized investment
banking firm that it could be reasonably expected to obtain such a rating.

           (e) Notwithstanding the foregoing provisions of this Section 2.2, a
Parent may Transfer its Partner Sub Stock (other than pursuant to Section 2.1)
only if all of the following occur:

               (i)   The Transfer is accomplished in a non-public offering in
          compliance with, and exempt from, the registration and qualification
          requirements of all federal and state securities laws and regulations.

               (ii)  The Transfer does not cause a default under any material
          contract to which the Partnership is a party or by which the
          Partnership or any of its properties is bound.

               (iii) The transferee executes an appropriate agreement to be
          bound by this Agreement.

               (iv)  The transferor and/or transferee bears all reasonable costs
          incurred by the Partnership in connection with the Transfer.

               (v)   The transferee (or the guarantor of the obligations of the
          transferee) satisfies the criteria set forth in Section 2.2(d) and
          delivers an agreement to the other Parent and the Partnership
          substantially in the form of this Agreement.

               (vi)  The proposed transferor is not in default in the timely
          performance of any of its material obligations to the Partnership.

               (vii) The provisions of Section 2.2(f) are satisfied.

          (f)  Neither Parent may Transfer the Partner Sub Stock of either of
its Partner Subs to any Person unless such Parent simultaneously Transfers the
Partner Sub Stock of its other 

                                       7
<PAGE>
 
Partner Sub to such Person or a wholly-owned Affiliate (as defined in the
Partnership Agreement) of such Person.

     2.3   Prohibition on Affiliated Obligor Bankruptcy, Etc.  Each Parent
hereby agrees that it will not, without the written consent of the other Parent,
permit any of its Affiliated Obligors (or their successors or assigns) (i) to
commence a voluntary action under the Federal bankruptcy laws, as now or
hereafter constituted, or any other applicable Federal or State bankruptcy,
insolvency or other similar law, (ii) to institute a proceeding to be
adjudicated a voluntary bankrupt, (iii) to consent to the filing of a bankruptcy
proceeding against it, (iv) to fail to contest a bankruptcy proceeding against
it, (v) to consent to the appointment of a receiver, custodian, liquidator or
trustee for it or for all or any substantial portion of its property, (vi) in
the case of its Partner Subs, to issue or sell other than to such Parent any of
its own Partner Sub Stock or (vii) to effect, recognize or permit any transfer
of any of its own Partner Sub Stock other than in accordance with the provisions
of Section 2 of this Agreement.

     2.4   Special Purpose Subsidiaries.  Each Parent agrees that (i) the
business of its Partner Subs shall be restricted solely to the holding of the
respective interests in the Partnership and the doing of things necessary or
incidental in connection therewith, and (ii) it will cause its Partner Subs not
to own any assets, incur any liabilities or engage, participate or invest in any
business outside the scope of their businesses as described in clause (i);
provided, however, that this Section 2.4 shall not apply with respect to any
Wholly Owned Affiliates to whom such Partner Subs shall transfer their
respective interests in the Partnership if such Wholly Owned Affiliates are not
bound by Section 9.6 of the Partnership Agreement.

                                   SECTION 3
                             STANDSTILL AGREEMENT
 
     3.1   Standstill.  Each Parent agrees that, until the expiration of 24
months from the date on which either such Parent and its Affiliates or the other
Parent and its Affiliates no longer hold an interest in the Partnership, neither
it, nor any of its Affiliated Obligors or other subsidiaries, shall, without
prior written approval of the other Parent: (i) in any manner acquire, agree to
acquire or make any proposal to acquire, directly or indirectly, any securities,
assets or property of the other Parent (other than such Parent's Partner Sub
Stock or the interests in the Partnership held by such Parent's Partner Subs),
whether such agreement or proposal is made with or to the other Parent or a
third party; (ii) make any unsolicited proposal to enter into, directly or
indirectly, any merger or other business combination involving the other Parent;
(iii) make, or in any way participate, directly or indirectly, in any
"solicitation" of "proxies" (as such terms are used in the proxy rules of the
Securities and Exchange Commission) to vote, or seek to advise or influence any
person with respect to the voting of, any voting securities of the other Parent;
(iv) form, join or in any way participate in a "group" (within the meaning of
Section 13(d)(3) of the Securities Exchange Act of 1934) with respect to any
voting securities of the other Parent; (v) otherwise act, alone or in concert
with others, to seek to control or influence the management, Board of Directors
or policies of the other Parent (other than with respect to the ownership,
business, property and affairs of the Partnership); (vi) disclose any intention,
plan or arrangement inconsistent with the foregoing; or (vii) advise, 

                                       8
<PAGE>
 
encourage, provide assistance (including financial assistance) to or hold
discussions with any other persons in connection with any of the foregoing. Each
Parent also agrees during such period not to: (i) request the other Parent (or
its directors, officers, employees or agents), directly or indirectly, to amend
or waive any provision of this Section 3.1 (including this sentence); or (ii)
take any action which might reasonably be expected to require the other Parent
to make a public announcement regarding the possibility of a business
combination or merger.

     3.2   Exceptions.  Notwithstanding the provisions of Section 3.1:

     (a)   Either Parent may, by notice to the other, terminate the provisions
of Section 3.1 (as applied to both Parents) at any time within 30 days after the
occurrence of any of the following events with respect to the other Parent: (i)
a Change of Control (as defined below) of such other Parent shall have occurred,
(ii) such other Parent shall have entered into a definitive agreement providing
for, or publicly announced its intention to effect, any transaction involving a
Change of Control of such other Parent or (iii) a tender offer or exchange offer
shall have been commenced or publicly announced that, if consummated, would have
the effect with respect to such other Parent described in clause (c) of the
definition of "Change of Control." A "Change of Control" of a Parent shall mean
the occurrence of any of the following events: (a) there shall be consummated
any consolidation, merger or share exchange of such Parent (i) in which such
Parent is not the continuing or surviving Person (other than a consolidation,
merger or share exchange with a wholly owned subsidiary of such Parent in which
all shares of common stock of such Parent outstanding immediately prior to the
effectiveness thereof are changed into or exchanged for the same number of
shares of common stock of such subsidiary) or (ii) pursuant to which the common
stock of such Parent is converted into cash, securities or other property, other
than, in each case, a consolidation, merger or share exchange of such Parent in
which the holders of the common stock immediately prior to the consolidation,
merger or share exchange hold, directly or indirectly, at least a majority of
the voting power and common equity of the continuing or surviving Person
immediately after such consolidation, merger or share exchange; (b) such
Parent's properties and assets are sold or otherwise disposed of substantially
as an entirety on a consolidated basis to any Person or group of Persons in any
one transaction or a series of related transactions, other than as contemplated
by the Master Transaction Agreement; or (c) any Person or any Persons acting
together which would constitute a "group" (as defined in Section 3.1) (other
than such Parent, any subsidiary of such Parent, any employee stock purchase
plan, stock option plan or other stock incentive plan or program, retirement
plan or automatic dividend reinvestment plan or any substantially similar plan
of such Parent or any subsidiary of such Parent or any Person holding securities
of such Parent for or pursuant to the terms of any such employee benefit plan),
together with any affiliates thereof, shall acquire beneficial ownership (as
defined in Rule 13d-3 under the Securities Exchange Act of 1934) of 50% or more
of the voting stock of such Parent.

     (b)   The terms of the first sentence of Section 3.1 shall not be
applicable to the purchase and sale of any securities of the other Parent by
independent third-party managers of any pension or other related employee
benefit plans who are acting as passive investors in the other Parent.

                                       9
<PAGE>
 
                                   SECTION 4
                                 MISCELLANEOUS
 

     4.1   No Waivers.  No failure or delay by a Beneficiary or a Parent in
exercising any right or power under this Agreement, or any single or partial
exercise of any such right or power, shall preclude any other or further
exercise thereof or the exercise of any other right or power. Such single or
partial exercise of any right or power shall be cumulative and not exclusive of
any rights or remedies provided by law.

     4.2   Expenses in Connection with Exercise.  In the event of a dispute
between parties hereto regarding the exercise or enforcement of any of the
rights of a Beneficiary under this Agreement or the failure by a Parent to
perform or observe any of the provisions of this Agreement, the party that does
not ultimately prevail in such dispute shall be liable, and hereby agrees, to
reimburse, on demand, each other such party for any and all costs and expenses,
including the fees and expenses of legal counsel and of any other counsel,
experts, consultants or agents, that such other party may incur in connection
therewith.

     4.3  Subordination.  The rights of a Parent against its Affiliated Obligors
arising from any payment or performance by a Parent hereunder shall be
subordinate in all respects to the rights of the Beneficiaries against such
Affiliated Obligors, and such Parent shall not compete in any way with a
Beneficiary in any winding-up or dissolution of such Affiliated Obligors unless
and until all sums due and to become due from such Affiliated Obligors to the
Beneficiaries have been paid in full. If any amount shall be paid to a Parent in
violation of this Section, such amount shall be held in trust for the benefit of
the Beneficiaries and shall forthwith be paid to the Beneficiaries to be
credited and applied to any sums owed or to be owed by such Parent's Affiliated
Obligors. Subject to the foregoing, upon payment of all sums due or to become
due by Affiliated Obligors to the Beneficiaries, the Parent of such Affiliated
Obligors shall be subrogated to the rights of the Beneficiary against such
Affiliated Obligors, and the Beneficiaries agree to take at such Parent's
expense such steps as such Parent may reasonably request to implement such
subrogation.

     4.4   Confidentiality and Use of Information.  (a) Each Parent agrees to be
bound by the terms and conditions of Section 13.1 of the Partnership Agreement
as if such Parent was a "Partner" as defined in such agreement.

     (b)   The Parents shall consult with each other on an ongoing basis with
respect to disclosures regarding the Partnership and its business and affairs
that each is required to make in reports filed from time to time with the
Securities and Exchange Commission.

     4.5   Competing Businesses.  If either Parent desires to initiate or pursue
any opportunity to undertake, engage in, acquire or invest in a Business
Opportunity (as such term is defined in the Partnership Agreement), such Parent
agrees to offer such Business Opportunity to the Partnership under the terms and
conditions set forth in Sections 9.3(c) and (d) of the Partnership Agreement as
if such Parent were the "Proposing Partner" (as defined in the Partnership
Agreement) with respect thereto, and in such event the Partnership shall have
the rights and obligations with respect thereto set forth in such Sections
9.3(c) and (d).

                                       10
<PAGE>
 
     4.6   Further Assurances.  From time to time, each Parent agrees to execute
and deliver such additional documents and provide such additional information
and assistance as the Beneficiaries may reasonably require to carry out the
terms of this Agreement.

     4.7   Successors and Assigns.  Except as may be expressly provided herein,
this Agreement shall be binding upon and inure to the benefit of the successors
of the Beneficiaries. Except as provided in this Agreement and except that a
Parent may assign its rights or obligations under this Agreement to a third
party in connection with a transfer of direct interests in the Partnership owned
by its Partner Subs if such transfer is permitted and consummated in accordance
with the Partnership Agreement, no Parent may assign or delegate any of its
rights or obligations under this Agreement without the prior written consent of
all the Beneficiaries, which consent shall be in the sole and absolute
discretion of such Beneficiaries. Any purported assignment or delegation without
such consent shall be void and ineffective.

     4.8   Benefits of Agreement Restricted to the Parties.  This Agreement is
made solely for the benefit of the Beneficiaries (as defined in Section 1.11),
and no other Person shall have any right, claim or cause of action under or by
virtue of this Agreement.

     4.9   Notices.  All notices, requests, demands and other communications
(collectively, "notices") required or may be given under this Agreement shall be
in writing and shall be deemed to have been duly given if and when (i)
transmitted by telecopier facsimile with proof of confirmation from the
transmitting machine or (ii) delivered by commercial courier or other hand
delivery, as follows:

If to Lyondell                          If to the Lyondell Partner Subs


Lyondell Petrochemical Company             _Lyondell Petrochemical Company    
1221 McKinney Street                       1221 McKinney Street               
Houston, Texas 77010                       Houston, Texas 77010               
Attention:  Jeffrey R. Pendergraft         Attention:  Jeffrey R. Pendergraft 
Telecopy Number: (713) 652-4538            Telecopy Number: (713) 652-4538
                                             


If to Millennium                        If to the Millennium Partner Subs


Millennium Chemicals Inc.                  _Millennium Chemicals Inc.         
99 Wood Avenue South                       99 Wood Avenue South               
Iselin, New Jersey  08830                  Iselin, New Jersey  08830          
Attention:  George H. Hempstead, III       Attention:  George H. Hempstead, III
Telecopy Number: (908) 603-6857            Telecopy Number: (908) 603-6857     
                                           

                                       11
<PAGE>
 
If to the Partnership

Equistar Chemicals, LP
1221 McKinney Street
Houston, Texas 77010
Attention:  Gerald A. O'Brien
Telecopy Number:  (713) 309-4718

or to such other address as such Parent or Beneficiary shall have specified by
notice to the other Parent.

     4.10  Severability.  In the event that any provisions of this Agreement
shall finally be determined to be unlawful, such provision shall, so long as the
economic and legal substance of the transactions contemplated hereby is not
affected in any materially adverse manner as to any party hereto, be deemed
severed from this Agreement and every other provision of this Agreement shall
remain in full force and effect.

     4.11  Termination.  Except for Sections 3.1 and 3.2, this Agreement shall
terminate and be of no further force and effect as to a Parent (i) as and when
provided in Section 2.1(d) or (ii) if and when such Parent Transfers all of its
Partner Sub Stock in a transaction permitted by Section 2.2; provided, however,
that such termination shall not discharge (x) any accrued Obligations owed by a
Parent as of the date of such termination or (y) any Obligations, whether
arising before or after such termination, under such Parent's Asset Contribution
Agreement (as such term is defined in the Partnership Agreement) or any Related
Agreement executed pursuant to such Asset Contribution Agreement. In addition,
the Guarantee by a Parent of Obligations of an Affiliated Obligor other than a
Partner Sub shall terminate as and when the Parent ceases to own any stock of
such Affiliated Obligor, insofar as such Guarantee relates to Obligations
arising thereafter.

     4.12  Construction and Certain Definitions.

     (a)   In construing this Agreement, the following principles shall be
followed:  (i) no consideration shall be given to the captions of the articles,
sections, subsections or clauses, which are inserted for convenience in locating
the provisions of this Agreement and not as an aid in construction; (ii) no
consideration shall be given to the fact or presumption that any party hereto
had a greater or lesser hand in drafting this Agreement; (iii) examples shall
not be construed to limit, expressly or by implication, the matter they
illustrate; (iv) the word "includes" and its syntactic variants mean "includes,
but is not limited to" and corresponding syntactic variant expressions; (v) the
plural shall be deemed to include the singular, and vice versa; (vi) each gender
shall be deemed to include the other gender; and (vii) each exhibit, attachment
and schedule to this Agreement is a part of this Agreement.

     (b)   The term "Person" shall mean any natural person or any corporation,
partnership, limited liability company, joint venture, association, trust or
other entity or organization.

                                       12
<PAGE>
 
     4.13  Counterparts.  This Agreement may be executed in one or more
counterparts, each of which shall constitute an original, and all of which when
taken together shall constitute one and the same original document.

     4.14  Governing Law.  The laws of the State of Delaware shall govern the
construction, interpretation and effect of this Agreement without giving effect
to any conflicts of law principles.

     4.15  Jurisdiction; Consent to Service of Process; Waiver.  ANY JUDICIAL
PROCEEDING BROUGHT AGAINST ANY PARTY TO THIS AGREEMENT OR ANY DISPUTE UNDER OR
ARISING OUT OF OR IN CONNECTION WITH THIS AGREEMENT OR ANY MATTER RELATED HERETO
SHALL BE BROUGHT IN THE FEDERAL OR STATE COURTS OF THE STATE OF DELAWARE, AND,
BY EXECUTION AND DELIVERY OF THIS AGREEMENT, EACH OF THE PARTIES TO THIS
AGREEMENT ACCEPTS THE EXCLUSIVE JURISDICTION OF SUCH COURTS AND IRREVOCABLY
AGREES TO BE BOUND BY ANY JUDGMENT (AS FINALLY ADJUDICATED) RENDERED THEREBY IN
CONNECTION WITH THIS AGREEMENT. EACH OF THE PARTIES TO THIS AGREEMENT SHALL
APPOINT THE CORPORATION TRUST COMPANY, THE PRENTICE-HALL CORPORATION SYSTEM,
INC. OR A SIMILAR ENTITY (THE "AGENT") AS AGENT TO RECEIVE ON ITS BEHALF SERVICE
OF PROCESS IN ANY PROCEEDING IN ANY SUCH COURT IN THE STATE OF DELAWARE. THE
FOREGOING CONSENTS TO JURISDICTION AND APPOINTMENTS OF AGENT TO RECEIVE SERVICE
OF PROCESS SHALL NOT CONSTITUTE GENERAL CONSENTS TO SERVICE OF PROCESS IN THE
STATE OF DELAWARE FOR ANY PURPOSE EXCEPT AS PROVIDED ABOVE AND SHALL NOT BE
DEEMED TO CONFER RIGHTS ON ANY PERSON OTHER THAN THE PARTIES HERETO. EACH PARENT
HEREBY WAIVES ANY OBJECTION IT MAY HAVE BASED UPON LACK OF PERSONAL
JURISDICTION, IMPROPER VENUE OR FORUM NON-CONVENIENS.

     4.16  Waiver of Jury Trial.  EACH PARTY HEREBY KNOWINGLY AND INTENTIONALLY,
IRREVOCABLY AND UNCONDITIONALLY WAIVES TRIAL BY JURY IN ANY LEGAL ACTION OR
PROCEEDING RELATING TO THIS AGREEMENT AND FOR ANY COUNTERCLAIM THEREIN.

     4.17  Dispute Resolution.  All disputes under this Agreement shall be
resolved in accordance with the Dispute Resolution Procedures set forth in
Appendix B.

     4.18  Amendment.  All waivers, modifications, amendments or alterations of
this Agreement shall require the execution of a written instrument signed by
each of the parties hereto.



                           [signature page follows]

                                       13
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Parent Agreement as of the date first above written.



                              LYONDELL PETROCHEMICAL COMPANY



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



                              MILLENNIUM CHEMICALS INC.



                              By: /s/ George H. Hempstead, III
                                 -----------------------------------------
                                  Name:  George H. Hempstead, III
                                  Title: Senior Vice President



                              EQUISTAR CHEMICALS, LP



                              By: /s/ Debra L. Starnes
                                 -----------------------------------------
                                  Name:  Debra L. Starnes
                                  Title: Senior Vice President
<PAGE>
 
                                  APPENDIX A
                                      TO
                               PARENT AGREEMENT



                          LIST OF RELATED AGREEMENTS



          1.   Partnership Agreement

          2.   Lyondell Note (as such term is defined in the Partnership
               Agreement)

          3.   Asset Contribution Agreements

               a.   Among Lyondell, Lyondell LP and the Partnership

               b.   Among Millennium Petrochemicals Inc., Millennium LP and the
                    Partnership

          4.   [LIST HERE ALL AGREEMENTS LISTED AS TIER 2 AGREEMENTS IN MASTER
               TRANSACTION AGREEMENT]



                                      A-1
<PAGE>
 
                                  APPENDIX B
                                      TO
                               PARENT AGREEMENT



                         DISPUTE RESOLUTION PROCEDURES


     (1)  Binding and Exclusive Means.  The dispute resolution provisions set
forth in this Appendix B shall be the binding and exclusive means to resolve all
disputes arising under this Agreement (each a "Dispute").

     (2)  Standards and Criteria.  In resolving any Dispute, the standards and
criteria for resolving such dispute shall, unless the Parents in their
discretion jointly stipulate otherwise, be as set forth in Appendix 1 to this
Appendix B.

     (3)  ADR and Binding Arbitration Procedures.  If a Dispute arises, the
following procedures shall be implemented:

     (a)  The Parent from whom recovery is sought may at any time invoke the
dispute resolution procedures set forth in this Appendix B as to any Dispute by
providing written notice of such action to the other Parent, who within five
Business Days after such notice shall schedule a meeting to be held in Houston,
Texas between the Parents.  The meeting shall occur within 10 Business Days
after notice of the meeting is delivered to the other Parent.  The meeting shall
be attended by representatives of each Parent having decision-making authority
regarding the Dispute as well as the dispute resolution process and who shall
attempt in a commercially reasonable manner to negotiate a resolution of the
Dispute.

     (b)  The representatives of the Parents shall cooperate in a commercially
reasonable manner and shall explore whether techniques such as mediation,
minitrials, mock trials or other techniques of alternative dispute resolution
might be useful.  In the event that a technique of alternative dispute
resolution is so agreed upon, a specific timetable and completion date for its
implementation shall also be agreed upon.  The representatives will continue to
meet and discuss settlement until the date (the "Interim Decision Date") that is
the earliest to occur of the following events: (i) an agreement shall be reached
by the Parents resolving the Dispute; (ii) one of the Parents shall determine
and notify the other Parent in writing that no agreement resolving the Dispute
is likely to be reached; (iii) if a technique of alternative dispute resolution
is agreed upon, the completion date therefor shall occur without the Parents
having resolved the Dispute; or (iv) if another technique of alternative dispute
resolution is not agreed upon, two full meeting days (or such other time period
as may be agreed upon) shall expire without the Parents having resolved the
Dispute.

     (c)  If, as of the Interim Decision Date, the Parents have not succeeded in
negotiating a resolution of the dispute pursuant to subsection (b), the Parents
shall proceed under subsection (d).


                                      B-1
<PAGE>
 
     (d)  The Parents agree to appoint a mutually acceptable neutral person not
affiliated with any of the Parents (the "Neutral").  If the Parents have been
unable to agree upon such appointment within 30 days after the Interim Decision
Date, then such Neutral, upon the application of either of the Parents shall be
appointed within 10 days of the filing of such application by the Center for
Public Resources, or if such appointment is not so made promptly then promptly
thereafter by the American Arbitration Association in Philadelphia,
Pennsylvania, or if such appointment is not so made promptly then promptly
thereafter by the senior United States District Court judge sitting in
Wilmington, Delaware.  The fees of the Neutral shall be paid equally by the
Parents except that the Neutral shall have discretion to award fees.

     (e)  In consultation with the Neutral, the Parents shall agree upon a
binding schedule and procedure (which procedure may have been previously
discussed under subsection (b)) to be used as a means to resolve or to attempt
to resolve Dispute, with the Neutral making the decision as to the schedule
and/or procedure if the Parents have been unable to agree on any of such matters
within 20 days after the initial selection of the Neutral.  The Parents agree to
participate in a commercially reasonable manner in the procedure to its
conclusion as determined by the Neutral.  If the Parents are not successful in
resolving the Dispute through the procedure described above, then the Parents
agree that (i) the Neutral shall act as the arbitrator in a binding arbitration
in accordance with the American Arbitration Association rules and shall render a
decision and (ii) judgment upon the decision rendered by the Neutral may be
entered in any court having jurisdiction.

     (4)  Continuation of Business. Notwithstanding the existence of any Dispute
or the pendency of any procedures pursuant to this Appendix B, the Parents agree
and undertake that all payments not in dispute shall continue to be made and all
obligations not in dispute shall continue to be performed.


                                      B-2
<PAGE>
 
                                  Appendix 1


     (a)   First priority shall be given to maximizing the consistency of the
resolution of the Dispute with the satisfaction of all express obligations of
the Parents and their Affiliates as set forth in the Agreement.

     (b)   Second priority shall be given to resolution of the Dispute in a
manner which best achieves the objectives of the business activities and
arrangements under the Agreement and permits the Parents to realize the benefits
intended to be afforded thereby.

     (c)   Third priority shall be given to such other matters, if any, as the
Parents or the Neutral shall determine to be appropriate under the
circumstances.


                                      B-3

<PAGE>

                                                                   Press Release
                                                                      EXHIBIT 99


 
[LYONDELL LOGO APPEARS HERE]                    [MILLENNIUM LOGO APPEARS HERE]


________________________________________________________________________________

                                                           FOR IMMEDIATE RELEASE


LYONDELL AND MILLENNIUM COMPLETE EQUISTAR JOINT VENTURE

     Houston, Texas, Iselin, New Jersey, and London, England - December 1, 1997
- - Lyondell Petrochemical Company (NYSE:LYO) and Millennium Chemicals Inc.
(NYSE:MCH) announced today that the joint venture transaction to form Equistar
Chemicals LP, combining both companies' olefins and polymers businesses, has
been completed. Equistar is now the largest and one of the lowest-cost producers
of ethylene and polyethylene in North America.  Equistar is owned 57% by
Lyondell and 43% by Millennium.

     With the completion of the transaction, Millennium Chemicals has received
$750 million today in cash and, in addition, expects to receive approximately
$250 million more over the next couple of months.

     William M. Landuyt, Chairman and Chief Executive Officer of Millennium
Chemicals, said, "We are pleased that Equistar has been launched right on
schedule.  We anticipate that this unique combination of assets and attitudes
will result in the creation of added economic value for Millennium shareholders.
The added financial flexibility that results from the transaction has already
been put to use as we are on track to acquire the  Thann et Mulhouse titanium
dioxide and specialty and intermediate chemicals business from Rhone Poulenc by
year end."

     Dan F. Smith, President and Chief Executive Officer of Lyondell, said,
"This transaction represents a major step in improving Lyondell's earnings and
cash flow outlook during all parts of the business cycle.  With Equistar, as
well as our majority interest in LYONDELL-CITGO Refining Company Ltd., Lyondell
is well positioned to generate significant cash flow over the next several
years, which will provide a broad 
<PAGE>
 
spectrum of value creation opportunities for the company." Smith is also serving
as Chief Executive Officer of Equistar.

Lyondell Petrochemical Company (web site: www.lyondell.com)  is a major chemical
and refining company, with majority ownership positions in the premier olefins,
polymers and refining companies in North America.  Lyondell is:
 .    The largest producer of ethylene, propylene and polyethylene in North
     America and a leading producer of high value-added specialty polymers,
     color concentrates and polymeric powder through its 57% interest in
     Equistar Chemicals, LP.
 .    One of the largest and most profitable refiners in the United States,
     processing very heavy Venezuelan crude oil to produce gasoline, low sulfur
     diesel and jet fuel, through its 58% interest in LYONDELL-CITGO Refining
     Company Ltd.
 .    The third largest methanol producer in the U.S., through its 75% interest
     in Lyondell Methanol Company LP.

Millennium Chemicals Inc. (web site: www.millenniumchem.com) is a major
international chemical company, with leading market positions in a broad range
of commodity, industrial, performance and specialty chemicals.
Millennium Chemicals Inc. is
 .    The second largest producer of TiO2 in the United States and third-largest
     in the world and a leading producer of titanium tetrachloride;
 .    The second-largest producer of acetic acid and vinyl acetate monomer in the
     United States;
 .    A leading producer of fragrance and flavor chemicals and other products,
     including cadmium/selenium pigments and silica gel; and
 .    Through its 43% interest in Equistar Chemicals LP, a joint venture with
     Lyondell Petrochemical Company, a partner in the largest producer of
     ethylene, propylene and polyethylene in North America and a leading
     producer of high value-added specialty polymers, color concentrates and
     polymeric powders.


The statements in this release relating to matters that are not historical facts
are forward-looking statements that involve risks and uncertainties, including,
but not limited to, future global economic conditions, production capacity,
competitive products and prices and other risks and uncertainties detailed in
the Securities and Exchange commission filings of Lyondell and Millennium
Chemicals.
                                    #  #  #
For information, please call:

LYONDELL                                          MILLENNIUM
Media: Jackie Wilson (713) 652-4596               Investors and Media:
                                                  Mickey Foster (732) 603-6777

Investors: Kevin DeNicola
(713) 652-4590


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