MILLENNIUM CHEMICALS INC
8-K, 1997-07-29
PLASTIC MATERIALS, SYNTH RESINS & NONVULCAN ELASTOMERS
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                                 Washington, DC



                                    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): July 25, 1997.


                            MILLENNIUM CHEMICALS INC.
             (Exact name of registrant as specified in its charter)


                                    Delaware
                 (State or Other Jurisdiction of Incorporation)



          1-12091                                                 22-3436215
(Commission File                                                (IRS Employer
         Number)                                             Identification No.)

                              99 Wood Avenue South
                            Iselin, New Jersey 08830
                    (Address of principal executive offices)

                                                             732-603-6600
              (Registrant's Telephone Number, Including Area Code)

                                 Not Applicable
          (Former Name or Former Address, if Changed Since Last Report)



<PAGE>



Item 5.

On July  25,  1997  Millennium  Chemicals  Inc.  (`Millennium")  signed a Master
Transaction  Agreement  pursuant  to which it  agreed  to  create a  partnership
("Partnership")  with Lyondell  Petrochemical  Company  ("Lyondell").  Under the
terms of the Master Transaction  Agreement,  which is attached hereto as exhibit
10.25 and is incorporated by reference, in exchange for a 43% ownership position
in the Partnership, Millennium will contribute the following:

         Millennium's olefins and polymers businesses,  located at manufacturing
         facilities in Clinton, Iowa; Morris, Illinois; LaPorte, Port Arthur and
         Chocolate Bayou, Texas;

         Millennium's   performance   polymers   business   with   manufacturing
         facilities in Tuscola,  Illinois;  Fairport Harbor and Heath, Ohio; and
         Crocket, Texas;

         Millennium's   synthetic   ethanol  and  ethyl  ether  businesses  with
         facilities  in Tuscola,  Illinois;  Newark,  New Jersey;  and  Anaheim,
         California;

         Research and  technology  groups and a research  center in  Cincinnati,
         Ohio.

The  Partnership  will assume $750 million of Millennium's  inter-company  debt,
which will be repaid  from the  proceeds  of new bank debt to be arranged by the
Partnership. Millennium will guarantee $750 million of the new bank facility. In
addition,  Millennium  will retain $250 million of accounts  receivable from the
contributed business.

In exchange for a 57% ownership position, Lyondell will contribute:

         Lyondell's  olefins  business,  comprised of two olefins  plants at the
         Channelview Petrochemical Complex near Houston, Texas;

         Lyondell's   polymers  business,   comprised  of  three   manufacturing
         facilities located in Pasadena, Victoria and Matagorda Counties, Texas;

         A technology group and certain business functions located in and   near
         Houston, Texas;

         $745 million of outstanding debt; and a

         $345 million note payable to the Partnership.

The Partnership will be governed by a partnership governance committee comprised
of three  representatives  of Millennium and three  representatives of Lyondell.
The two companies issued a joint press release announcing the Partnership, dated
July 28, 1997, which is attached hereto as Exhibit 99 and incorporated herein by
reference.   The   transaction  is  subject  to  approval  by  both   companies'
stockholders  and satisfaction of certain other  conditions.  The transaction is
expected to close by the end of the year.



<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.


                            MILLENNIUM CHEMICALS INC.
                                  (Registrant)



Date:  July 29, 1997                       By:  /s/ George H. Hempstead, III
                                                 ----------------------------
                                                 George H. Hempstead, III
                                                 Senior Vice President - Law and
                                                 Administration and Secretary




<PAGE>


EXHIBIT INDEX

                                                                  Sequentially
Exhibit                                                           Numbered Page
No.                                         Exhibits              Where Located

10.25                               Master Transaction Agreement

99                                  Press Release

<PAGE>









                          MASTER TRANSACTION AGREEMENT

                                     BETWEEN

                         LYONDELL PETROCHEMICAL COMPANY

                                       AND

                            MILLENNIUM CHEMICALS INC.





<PAGE>





                                      -iii-
NY01:65772.16
                                TABLE OF CONTENTS

                                                                           Page

SECTION 1          FORMATION, RELATED AGREEMENTS AND CLOSING..................1
         1.1       Formation of the Partnership...............................1
         1.2       Tier 1 Related Agreements..................................1
         1.3       Tier 2 Related Agreements..................................2
         1.4       Closing Date...............................................2
         1.5       Contributions of Assets and Assumption of Liabilities......2
         1.6       New Bank Debt and Payment of Millennium Assumed Debt.  ....2

SECTION 2          REPRESENTATIONS AND WARRANTIES.............................2
         2.1       Due Organization, Good Standing and Power..................2
         2.2       Authorization and Validity of Agreements...................3
         2.3       Lack of Conflicts..........................................3
         2.4       Certain Fees...............................................4
         2.5       SEC Reports; Financial Statements..........................4
         2.6       Absence of Certain Changes.................................4
         2.7       Information Supplied for Joint Proxy Statement.............5

SECTION 3          ADDITIONAL AGREEMENTS......................................5
         3.1       Access to Information......................................5
         3.2       Conduct of the Contributed Business Pending the 
                     Closing Date.............................................6
         3.3       Further Actions............................................7
         3.4       Notifications..............................................8
         3.5       Joint Proxy Statement; Stockholders Meetings...............8
         3.6       Employee Matters...........................................9
         3.7       No Inconsistent Action.....................................9
         3.8       Closing Amendments Certificate.............................9
         3.9       Alternative Proposals.....................................10

SECTION 4          CONDITIONS TO CLOSING.....................................10
         4.1       Conditions Precedent to Obligations of Both Parties.......10
                   (a)     No Injunction, etc................................10
                   (b)     Tier 2 Related Agreements.........................11
                   (c)     Government Licenses and Consents..................11
                   (d)     Stockholder Approvals.............................11
                   (e)     Bank Credit Facility..............................11
                   (f)     Initial Strategic Plan and Annual Budget..........11
         4.2       Conditions Precedent to Obligations of Lyondell...........11
                   (a)     Closing Amendments Certificate....................11
                   (b)     Accuracy of Representations and Warranties........12
                   (c)     Performance of Agreements.........................12
                   (d)     No Material Adverse Change........................12
                   (e)     Third Party Consents..............................12
                   (f)     Officer's Certificate.............................12
         4.3       Conditions Precedent to Obligations of Millennium.........13
                   (a)     Closing Amendments Certificate....................13
                   (b)     Accuracy of Representations and Warranties........13
                   (c)     Performance of Agreements.........................13
                   (d)     No Material Adverse Change........................13
                   (e)     Third Party Consents..............................13
                   (f)     Officer's Certificate.............................13

SECTION 5          TERMINATION AND WAIVER....................................14
         5.1       General...................................................14
         5.2       Effect of Termination.....................................16
         5.3       Termination Fees..........................................16

SECTION 6          MISCELLANEOUS.............................................17
         6.1       Successors and Assigns....................................17
         6.2       Benefits of Agreement Restricted to Parties...............17
         6.3       Notices...................................................17
         6.4       Severability..............................................18
         6.5       Press Releases............................................18
         6.6       Confidentiality Agreements................................18
         6.7       Construction..............................................18
         6.8       Counterparts..............................................19
         6.9       Governing Law.............................................19
         6.10      Transaction Costs.........................................19
         6.11      Amendment.................................................19
         6.12      Jurisdiction; Consent to Service of Process; Waiver.......19
         6.13      Waiver of Jury Trial......................................20

APPENDICES
Appendix A         Definitions
Appendix B         List of Related Agreements
Appendix B-2       List of Certain Tier 2 Related Agreements
Appendix C         Terms of Lyondell Note
Appendix D         Terms of Bank Credit Agreement


<PAGE>


SCHEDULES

Schedule 2                 Exceptions
Schedule 4.2(e)    Lyondell Consents
Schedule 4.3(e)    Millennium Consents
Schedule 6.10              Certain Expenses


EXHIBITS

Exhibit A          Form of Partnership Agreement
Exhibit B          Form of Asset Contribution Agreement
Exhibit C          Form of Parent Agreement


<PAGE>






                          MASTER TRANSACTION AGREEMENT


         This Master  Transaction  Agreement (this  "Agreement")  dated July 25,
1997 is entered into by and between Lyondell  Petrochemical Company ("Lyondell")
and Millennium Chemicals Inc. ("Millennium").

         The definitions of capitalized terms used in this Agreement,  including
the appendices hereto, are set forth in Appendix A hereto.

         WHEREAS, the parties desire to establish a joint venture in the form of
a partnership  (the  "Partnership")  to engage in the olefins,  polyolefins  and
certain   related   petrochemicals   businesses   in  the   United   States  and
internationally,  including research and development,  purchasing and processing
feedstocks, and manufacturing, marketing and distributing products;

         WHEREAS, upon the terms and subject to the conditions set forth herein,
the Partnership will be formed and will acquire the Contributed Businesses to be
contributed  by Lyondell  and by  Millennium  Petrochemicals  Inc.  ("Millennium
Petrochemicals"), an indirect wholly owned subsidiary of Millennium; and

         WHEREAS,  the parties who have executed this Agreement (the  "Parties")
wish to make certain  representations  and warranties to one another and provide
for the coordination of the closing of all the transactions contemplated by this
Agreement (the "Closing");

         NOW,  THEREFORE,  in  consideration  of the  premises  and  the  mutual
covenants of the Parties set forth herein, it is hereby agreed as follows:


                                    SECTION 1

                    FORMATION, RELATED AGREEMENTS AND CLOSING
                    -----------------------------------------

     1.1  Formation of the  Partnership.  As soon as  practicable  following the
execution  and delivery of this  Agreement,  the Parties  shall cause certain of
their  Subsidiaries  to  form  the  Partnership,  to  execute  and  deliver  the
Partnership Agreement and to make initial cash contributions thereto aggregating
$1,000,000.  In exchange for its  contribution  of $570,000,  the Lyondell Group
will receive an interest or interests in the  Partnership  representing,  in the
aggregate,  57% of the  interests  in  the  Partnership.  In  exchange  for  its
contribution  of  $430,000,  the  Millennium  Group will  receive an interest or
interests  in  the  Partnership  representing,  in  the  aggregate,  43%  of the
interests in the Partnership.



<PAGE>


                                                
     1.2 Tier 1 Related Agreements. The Tier 1 Related Agreements are designated
as such on Appendix B. Forms of each of the Tier 1 Related Agreements (including
forms of certain  of the  exhibits  and  versions  of  certain of the  schedules
thereto current as of the dates  indicated  therein) are attached as Exhibits to
this Agreement. On the terms and subject to the conditions set forth herein, the
Parties  shall cause each such  agreement  to be executed  and  delivered by the
appropriate  parties thereto at (or, in the case of the  Partnership  Agreement,
prior to) the  Closing  in  substantially  the form  attached  hereto  with such
changes as may be effected pursuant to Section 3.8 or otherwise agreed to by the
Parties in good faith.

     1.3 Tier 2 Related Agreements. The Tier 2 Related Agreements are designated
as such on Appendix B. The forms of each of the Tier 2 Related  Agreements shall
be negotiated  by the Parties prior to the Closing in good faith and  consistent
with the terms and provisions  thereof indicated on Appendix B. On the terms and
subject  to the  conditions  set forth  herein,  the  Parties  shall  cause such
agreements to be executed and delivered in such forms by the appropriate parties
thereto at the Closing.

     1.4 Closing  Date.  Provided  that the  conditions  precedent  set forth in
Section 4 of this  Agreement  shall have been  satisfied or waived,  the Closing
shall be held at a  mutually  agreeable  location  on the first day of the first
calendar  month  after the date  hereof  when all such  conditions  have been so
satisfied  or waived or on such other date as may be agreed to in writing by the
Parties (the "Closing Date").  The Closing shall be deemed to occur at 4:01 a.m.
Houston, Texas time on the Closing Date.

     1.5 Contributions of Assets and Assumption of Liabilities.  As contemplated
by the Asset Contribution Agreements, the Parties shall on the Closing Date make
or cause to be made the contributions of assets contemplated thereby, subject to
the  assumption of  liabilities  contemplated  thereby  (including  the Lyondell
Assumed  Debt and the  Millennium  Assumed  Debt).  In  addition,  the  Lyondell
contributing partner shall execute and deliver to the Partnership on the Closing
Date a  promissory  note in the  principal  amount of $345  million  having  the
principal  terms  set  forth on  Appendix  C hereto  and  otherwise  in form and
substance reasonably satisfactory to the Parties.

     1.6 New Bank Debt and Payment of  Millennium  Assumed  Debt. On or prior to
the Closing Date,  the Parties shall cause the  Partnership to enter into a bank
credit agreement or agreements providing for (i) loans of an aggregate principal
amount of $1.0  billion  and (ii) a working  capital  facility  in an  aggregate
principal amount of $250 million, in each case having other terms and provisions
consistent with Appendix D hereto and otherwise  reasonably  satisfactory to the
Parties.  On the Closing  Date,  using the proceeds of the loans  referred to in
clause (i), the Partnership shall repay in full the Millennium Assumed Debt.


                                    SECTION 2

                         REPRESENTATIONS AND WARRANTIES
                         ------------------------------

     Except as set forth on Schedule 2 with  respect to such  Party,  each Party
represents and warrants to the other Party that:

     2.1 Due  Organization,  Good Standing and Power. Such Party and each member
of its  Group  (i) is  (or,  if not  yet  formed,  at  the  Closing  will  be) a
corporation,  limited partnership, limited liability company or other entity, as
the case may be, duly organized, validly existing and in good standing under the
laws of the  jurisdiction of its  incorporation  or organization and has (or, if
not yet formed, at the Closing will have) the corporate power and authority,  or
power under its constituent documents, to own, lease and operate its assets and,
if applicable, to conduct the Contributed Business now being conducted by it and
to be conducted by it as of the Closing,  (ii) is (or, if not yet formed, at the
Closing  will be) duly  authorized,  qualified  or  licensed to do business as a
foreign  corporation or other organization in, and is (or, if not yet formed, at
the Closing will be) in good standing in, each of the jurisdictions in which its
right,  title  or  interest  in or to  any  of  the  assets  held  by it or  the
Contributed  Business conducted by it, if applicable (or, if not yet formed, the
assets or business to be held or  conducted by it as of the  Closing),  requires
such authorization,  qualification or licensing,  except where the failure to be
so authorized,  qualified,  licensed or in good standing would not be reasonably
likely to have a Material Adverse Effect,  and (iii) has, and in the case of the
Related  Agreements to be executed by it at or prior to the Closing,  will have,
all requisite  corporate  power and authority,  or power and authority under its
constituent  documents,  to enter into this Agreement  and, as  applicable,  the
Related  Agreements to which it is or will be a party and,  subject to obtaining
the authorizations or consents referred to in Section 2.2 hereof, to perform its
obligations hereunder and thereunder.

     2.2 Authorization and Validity of Agreements.

          (a) The  execution,  delivery  and  performance  by such Party of this
     Agreement  and  the  consummation  by it of the  transactions  contemplated
     hereby have been duly  authorized  and approved by all necessary  corporate
     action on its part,  except  for any  Lyondell  stockholder  or  Millennium
     stockholder approval that may be required. This Agreement has been duly and
     validly  executed and  delivered by such Party and is its legal,  valid and
     binding  obligation,  enforceable  against it in accordance with its terms,
     except as the same may be limited  by  applicable  bankruptcy,  insolvency,
     reorganization, moratorium or other laws related to or affecting creditors'
     rights generally and by general equity principles.

          (b) The  execution,  delivery and  performance  by such Party and each
     member of its Group of the Related  Agreements to which it or any member of
     its Group will be a party and the  consummation  by it and its Group of the
     transactions  contemplated  thereby  will  be,  as  of  the  Closing,  duly
     authorized and approved by all necessary corporate or similar action on its
     or their part. At the Closing, each of the Related Agreements to which such
     Party or any member of its Group  will be a party will be duly and  validly
     executed and  delivered by such Party or member and will be upon  execution
     and delivery a legal, valid and binding obligation,  enforceable against it
     or such  member in  accordance  with its  terms,  except as the same may be
     limited by applicable bankruptcy, insolvency, reorganization, moratorium or
     other laws  related to or  affecting  creditors'  rights  generally  and by
     general equity principles.

     2.3 Lack of Conflicts.  Assuming  receipt of the consents  contemplated  by
Schedule 4.2(e) or 4.3(e),  as applicable,  each of the execution,  delivery and
performance by such Party and each member of its Group of this Agreement and the
Related  Agreements  to  which  any of  them  is or  will  be a  party  and  the
consummation by them of the  transactions  contemplated  hereby and thereby does
not and, as of the Closing,  will not (i) violate (with or without the giving of
notice or the lapse of time or both) any Legal Requirement  applicable to any of
them or any of their Subsidiaries, other than those that would not be reasonably
likely to have a Material  Adverse Effect,  (ii) conflict with, or result in the
breach of, any  provision  of the  charter  or by-laws or similar  governing  or
organizational  documents  of any of them or any of  their  Subsidiaries,  (iii)
result in the creation of any Encumbrance  upon any of their assets,  other than
those contemplated by this Agreement or any of the Related Agreements,  or those
that would not be reasonably  likely to have a Material Adverse Effect,  or (iv)
violate,  conflict with or result in the breach or  termination  of or otherwise
give any other Person the right to terminate,  or constitute a default, event of
default or an event which with notice, lapse of time or both, would constitute a
default or event of default under the terms of, any contract,  indenture, lease,
mortgage,  Government  License or other  agreement or instrument to which any of
them or any of  their  Subsidiaries  is a party or by which  the  properties  or
businesses  of any of them or any of their  Subsidiaries  are bound,  except for
violations,  conflicts,  breaches,  terminations  and defaults that would not be
reasonably likely to have a Material Adverse Effect.

     2.4 Certain Fees.  Neither such Party nor any of its  Affiliates nor any of
its officers,  directors or employees,  on behalf of it or such Affiliates,  has
employed any broker or finder or incurred any other  liability for any financial
advisory fees,  brokerage fees,  commissions or finders' fees in connection with
the  transactions  contemplated  hereby,  except for fees payable by Lyondell to
Salomon  Brothers Inc and fees payable by Millennium to J.P.  Morgan  Securities
Inc.

     2.5 SEC Reports; Financial Statements.

          (a) Such Party has filed all  material  forms,  reports and  documents
     required  to be filed by it with the SEC  since  December  31,  1996  (with
     respect to either Party, its "SEC Reports").  Such Party's SEC Reports were
     prepared in all material  respects in accordance  with the  requirements of
     the Securities  Act, or the Exchange Act, as the case may be, and the rules
     and regulations thereunder, and none of such Party's SEC Reports, as of the
     date it was filed with the SEC and  insofar  as it relates to such  Party's
     Contributed Business,  contained any untrue statement of a material fact or
     omitted to state a material fact required to be stated therein or necessary
     to make the statements  therein,  in the light of the  circumstances  under
     which they were made, not misleading.

          (b) The financial  statements  (including any notes thereto) contained
     in such Party's SEC Reports were prepared in accordance  with United States
     generally  accepted  accounting  principles  applied on a consistent  basis
     ("GAAP")  throughout the periods  indicated  (except as may be indicated in
     the notes  thereto  and except  that  financial  statements  included  with
     quarterly  reports  on Form  10-Q do not  contain  all  GAAP  notes to such
     financial  statements)  and  each  fairly  presents  the  consolidated  (or
     combined,  as  applicable)  financial  position,  results of operations and
     changes  in  stockholders'  equity  and cash  flows of such  Party  and its
     subsidiaries  as at the  respective  dates  thereof and for the  respective
     periods indicated therein (subject, in the case of unaudited statements, to
     normal and recurring year-end adjustments).

     2.6 Absence of Certain Changes. Since December 31, 1996, (i) such Party and
its Affiliates have not incurred any material liabilities or obligations, fixed,
contingent,  accrued  or  otherwise,  that  relate  to or are  allocable  to its
Contributed  Business  and that  have  had or are  reasonably  likely  to have a
Material  Adverse Effect,  (ii) such Party and its Affiliates have conducted its
Contributed Business in all material respects in the ordinary course, consistent
with past practice, and (iii) no event,  occurrence or other matter has occurred
that is reasonably  likely to have a Material Adverse Effect with respect to the
Contributed  Business of such Party,  provided that this determination  shall be
made without regard to any change in general economic or political conditions or
any change in raw materials prices,  product prices,  industry capacity or other
matter of industry-wide  application that affects the Contributed  Businesses of
both Parties in a substantially similar way.

     2.7 Information Supplied for Joint Proxy Statement. None of the information
supplied or to be  supplied  by such Party for  inclusion  or  incorporation  by
reference in the Joint Proxy  Statement to be filed with the SEC by Lyondell and
Millennium in connection with the stockholder  meetings to be held in connection
with this Agreement will, at the date mailed to stockholders,  or at the time of
such meetings,  contain any untrue statement of a material fact or omit to state
any material  fact  required to be stated  therein or necessary in order to make
the statements  therein,  in the light of the circumstances under which they are
made, not  misleading.  If at any time prior to the time of either such meeting,
any event with respect to a Party, or with respect to other information supplied
by a Party for  inclusion  in the Joint  Proxy  Statement,  shall occur which is
required to be described in an amendment of, or a supplement to, the Joint Proxy
Statement,  such event shall be so described,  and such  amendment or supplement
shall be promptly filed with the SEC.  Insofar as it relates to such Party,  the
Joint Proxy  Statement will comply as to form in all material  respects with the
provisions of the Exchange Act and the rules and regulations thereunder.


                                    SECTION 3
 
                              ADDITIONAL AGREEMENTS
                              ---------------------

     3.1  Access to  Information.  Each  Party  agrees  that,  during the period
commencing  on the date  hereof and ending at the  Closing,  (i) it will give or
cause to be given to the other Party and its  representatives  reasonable access
during  normal  business  hours to the offices,  plants,  properties,  books and
records relating to its Contributed  Business, as the other Party may reasonably
request,  (ii) it will furnish or cause to be  furnished to the other Party,  to
the extent  prepared in the ordinary  course,  such financial and operating data
and any other  information  with respect to the business and  properties  of its
Contributed  Business  as the other Party may  reasonably  request and (iii) the
other  Party and its  representatives  shall be entitled  to  reasonable  access
during normal  business hours to the  representatives,  officers,  employees and
contractors of such Party who are involved in the Contributed  Business,  as the
other Party may reasonably request;  provided that, after  consultation,  to the
extent  permissible,  with the other Party,  such Party may restrict  access and
provision of information to the extent it reasonably  believes  necessary to (w)
comply with existing  confidentiality  agreements  with third parties  (provided
that, upon the other Party's reasonable  request,  it shall use its commercially
reasonable  efforts to secure waivers of any such  confidentiality  agreements),
(x)  ensure  compliance  with  antitrust  laws,  (y)  preserve  the  secrecy  of
confidential  information to the extent not related to its Contributed  Business
and (z)  preserve  legal  privilege;  and  provided,  further that any access or
information  obtained by any Party and its  representatives  in accordance  with
this  Section 3.1 and  otherwise  in  connection  with the  consummation  of the
transactions  contemplated by this Agreement and the Related Agreements shall be
subject to the terms and conditions of the Confidentiality Agreements.

     3.2 Conduct of the  Contributed  Business  Pending the Closing  Date.  Each
Party  agrees  that,  except as required or  contemplated  by this  Agreement or
otherwise  consented  to or approved in writing by the other  Party,  during the
period commencing on the date hereof and ending on the Closing Date, it will and
will cause its Affiliates to:

          (a) use its  commercially  reasonable  efforts to operate and maintain
     its  Contributed  Business  in all  material  respects  only in the  usual,
     regular  and  ordinary  manner  consistent  with past  practice  (including
     undertaking scheduled or necessary  "turnarounds" or other maintenance work
     and  including   offsite  storage,   treatment  and  disposal  of  chemical
     substances  generated  prior to the Closing) and, to the extent  consistent
     with such operation and maintenance, use commercially reasonable efforts to
     preserve the present  business  organization  of its  Contributed  Business
     intact,  keep  available  the services  of, and good  relations  with,  the
     present  employees  and  preserve  present  relationships  with all persons
     having business dealings with its Contributed Business, except in each case
     for such matters that,  individually  and in the aggregate,  do not and are
     not reasonably  likely to have a Material Adverse Effect on its Contributed
     Business;

          (b) maintain its or their books,  accounts and records relating to its
     Contributed  Business in the usual, regular and ordinary manner, on a basis
     consistent  with past  practice,  comply in all material  respects with all
     Legal   Requirements   and  contractual   obligations   applicable  to  its
     Contributed  Business or to the  conduct of its  Contributed  Business  and
     perform  all  of  its  or  their  material   obligations  relating  to  its
     Contributed Business;

          (c) not (i)  modify  or  change  in any  material  respect  any of its
     Contributed Assets or dispose of any material  Contributed Asset except for
     (A) inventory,  equipment,  supplies and other  Contributed  Assets sold or
     otherwise  disposed  of in the  ordinary  course  of  business  and (B) any
     Contributed  Assets that in the  ordinary  course of business  are replaced
     with substantially  similar Contributed Assets, (ii) except in the ordinary
     course of business after  consultation with the other Party, (x) enter into
     any  contract,  commitment  or  agreement  that  would be  material  to the
     operation of its Contributed  Business or use of the Contributed Assets or,
     except  as   expressly   contemplated   by  this   Agreement  or  expressly
     contemplated by or required pursuant to their respective  terms,  modify or
     change in any  material  respect any  obligation  under any such  contract,
     commitment or agreement,  (y) modify or change in any material  respect any
     obligation  under  its  Government  Licenses,  (z)  modify or change in any
     material  respect  the  manner  in  which  the  products  produced  by  its
     Contributed  Business are marketed and sold,  or (iii) enter into  interest
     rate protection or other hedging agreements (except for hydrocarbon hedging
     agreements  entered into in the ordinary  course and expiring prior to June
     30, 1998) relating to its Contributed Business;

          (d)  not  waive  any  material   claims  or  rights  relating  to  its
     Contributed Business; 

          (e) after obtaining Knowledge thereof,  give notice to the other Party
     of any claim or litigation (threatened or instituted) or any other event or
     occurrence  which could  reasonably be expected to have a Material  Adverse
     Effect on its Contributed  Assets or Contributed  Business,  other than the
     types of events,  occurrences  or other matters  referred to in the proviso
     set forth in Section 2.6(iii);

          (f) not take any  action  that is  reasonably  likely to result in its
     representations and warranties in Section 2 hereof, or in the form of Asset
     Contribution  Agreement  of such  Party,  not  being  true in all  material
     respects as of the Closing Date; and

          (g) not agree, whether in writing or otherwise,  to take any action it
     has agreed pursuant to this Section 3.2 not to take;

provided,  however,  that notwithstanding  anything to the contrary contained in
this  Section  3.2,  prior  to the  Closing  Date  the  Lyondell  Group  and the
Millennium Group will act  independently of each other in making decisions as to
the research and development, raw materials,  manufacturing,  pricing, marketing
and distribution of their products.

         3.3       Further Actions.

          (a) Subject to the terms and conditions  hereof,  each Party agrees to
     act in good faith and to use its commercially  reasonable  efforts to take,
     or cause to be  taken,  all  actions  and to do,  or cause to be done,  all
     things necessary,  proper or advisable to consummate and make effective the
     transactions   contemplated   by  this  Agreement  and  under  the  Related
     Agreements  to be entered into by such Party or its  Affiliates at Closing,
     and to confirm that such  transactions  have been  accomplished,  including
     without limitation using all commercially reasonable efforts: (i) to obtain
     and effect  prior to the Closing Date all  necessary  Consents and Filings;
     and (ii) to obtain  prior to the Closing  Date all  Government  Licenses or
     consents to the transfer of any Government  Licenses that are  transferable
     by  it  or  its  Affiliates   necessary  to  consummate  the   transactions
     contemplated  hereby  and by the  Related  Agreements  and to allow for the
     prudent and  uninterrupted  operation of the Contributed  Businesses by the
     Partnership after the Closing.  Each Party shall furnish to the other Party
     and its Affiliates  such necessary  information and assistance as the other
     may  reasonably  request in  connection  with its  preparation  of any such
     Filings or other materials required in connection with the foregoing.

          (b) Each  Party  shall  use its  commercially  reasonable  efforts  to
     procure  all  Consents  that are  necessary  to  transfer  its  Contributed
     Business to the  Partnership.  Notwithstanding  any other provision of this
     Agreement to the contrary, the Parties hereto acknowledge and agree that at
     the Closing the Parties will not assign to the  Partnership any Contract or
     warranties which by their terms require Consent from any other  contracting
     party  thereto  unless  any such  Consent  has been  obtained  prior to the
     Closing Date. Before the Closing,  the other Party and the Partnership will
     use their commercially reasonable efforts and cooperate with the Party that
     is obligated to assign such contract (the "Contracting Party") in obtaining
     any  necessary  Consents to the  assignment  of the  Contracts,  including,
     without limitation, by furnishing to the Contracting Party or other parties
     to any Contract summary  financial  information and other  information with
     respect to the Partnership reasonably requested by the Contracting Party or
     such other parties and taking any such other actions (which, subject to any
     provisions  to the contrary  included in any Related  Agreement,  shall not
     include  the  incurrence  of  any  expense  not  otherwise  required  to be
     incurred) as the  Contracting  Party or such other  parties may  reasonably
     request for the purpose of obtaining any releases,  waivers or terminations
     as the Contracting Party may reasonably  request on behalf of itself or any
     Affiliate.  No representation is made by the Contracting Party with respect
     to whether any Consent to assign a Contract will be  obtainable,  and in no
     event shall the initial capital  contributions be subject to reduction as a
     result of any Contract not being assigned to the Partnership at the Closing
     by virtue  of the  necessary  Consent  not being  obtained.  Following  the
     Closing,  the Parties 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 Parties 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 Contract 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 Contracts,  in which case, as provided for in the applicable Asset
     Contribution Agreement, the Partnership shall promptly assume and discharge
     (or  reimburse  the  Party  so  contributing  or  its  Affiliate  for)  all
     obligations and liabilities  associated with the benefits of such Contracts
     so made available to the Partnership.

          (c) Each Party shall keep the other Party fully  informed from time to
     time as the other  Party shall  reasonably  request as to the status of all
     Consents being sought by such Party pursuant to Section 3.3(b).

          (d) Each  Party  shall  furnish to the other  Party such  information,
     cooperation  and  assistance as  reasonably  may be requested in connection
     with the foregoing.

          (e) Each Party  shall  negotiate  and  otherwise  act in good faith to
     complete,  execute and deliver the Related Agreements at the Closing and to
     effect the Closing at the earliest practicable date.

     3.4  Notifications.  Each Party  shall  notify the other  Party and keep it
advised as to (i) any  litigation or  administrative  proceeding  that is either
pending or, to its Knowledge, threatened against such Party which challenges the
transactions  contemplated hereby; (ii) any material damage to or destruction of
its Contributed  Business;  and (iii) any fact of which such Party has Knowledge
that  indicates  that any  condition to Closing is  reasonably  likely not to be
satisfied in a timely fashion.

     3.5  Joint  Proxy  Statement;  Stockholders  Meetings.  The  Parties  shall
promptly  prepare and file with the SEC the Joint Proxy Statement in preliminary
form. Each Party shall use its commercially reasonable efforts to respond to any
comments of the SEC staff with respect  thereto,  in order to permit  mailing to
stockholders of the definitive Joint Proxy Statement as promptly as practicable.
Subject to the  provisions  of Sections 3.9 and 5.1, each Party shall (a) call a
meeting of its stockholders to be held as promptly as practicable after the date
hereof for the purpose of voting upon the transfer of its  Contributed  Business
contemplated  hereby,  (b)  through  its Board of  Directors,  recommend  to its
stockholders  approval of such matters and not rescind such recommendation,  (c)
use  commercially  reasonable  efforts to cause the Joint Proxy  Statement to be
mailed  to its  stockholders  at the  earliest  practicable  date  and  (d)  use
commercially  reasonable  efforts  to obtain  approval  of the  transfer  of its
Contributed Business contemplated hereby by its stockholders.

     3.6 Employee Matters. The Parties agree that:

          (a)   Substantially   all   employees  of  Lyondell   and   Millennium
     Petrochemicals who are associated with the Contributed  Businesses shall be
     offered employment with the Partnership  pursuant to the terms of the Asset
     Contribution Agreements.

          (b) After the date hereof,  the Parties  shall  develop  compensation,
     benefit and  personnel  plans,  policies or programs  for the  Partnership,
     including those  regarding  retirement,  401(k),  medical and other welfare
     benefits, vacation, severance and other executive benefits.

     3.7 No Inconsistent Action.  Subject to Section 5, neither Party shall take
any material action  inconsistent  with its obligations  under this Agreement or
which  could  materially  hinder  or  delay  the  consummation  of the  Closing;
provided,  however, that any action that may be taken in accordance with Section
3.2 or 3.9 shall not be deemed to violate this Section 3.7.

     3.8 Closing Amendments Certificate. At or immediately prior to the Closing,
each of the Lyondell Group and the  Millennium  Group shall complete and deliver
to the other Group and to the  Partnership  an executed  statement,  signed by a
duly authorized  officer of Lyondell or Millennium as the representative of such
delivering  Group,  setting forth all amendments and additions to this Agreement
or the Related  Agreements or to the  schedules and exhibits  hereto and thereto
(if any) that such  Group  believes  in good faith to be  necessary  to make the
representations and warranties of all of its members contained in this Agreement
or the  Related  Agreements  true and correct in all  respects  (other than such
matters as are, individually and in the aggregate, immaterial to its Contributed
Business) as of the Closing (such  Group's  "Closing  Amendments  Certificate").
Each Group shall examine any such Closing Amendments Certificate presented to it
by the other Group,  and if it is acceptable to such examining Group (or if such
examining  Group is willing to waive the condition that such Closing  Amendments
Certificate  be  acceptable  to it)  Lyondell or  Millennium  as such  examining
Group's  representative  shall also execute it,  whereupon  the  amendments  and
additions set forth therein with respect to this Agreement and the Schedules and
Exhibits  hereto shall become  effective for all purposes and the amendments and
additions  set forth  therein  with  respect to the Related  Agreements  and the
schedules  and exhibits  thereto  shall be effected  prior to the  execution and
delivery  thereof  so as to be  effective  for all  purposes  from and after the
Closing. 3.9 Alternative Proposals. Each Party agrees that:

          (a) After the date  hereof  and prior to the  Closing  Date or earlier
     termination of this  Agreement,  such Party shall not, and shall not permit
     any of its Affiliates to, and such Party shall, and shall cause each of its
     Affiliates to, cause each officer,  director and employee of such Party and
     its Affiliates, and each attorney, accountant, investment banker, financial
     advisor and other agent retained by them,  not to,  directly or indirectly,
     initiate,  solicit or encourage the  submission of any proposal or offer to
     acquire or operate all or any material part of its Contributed  Business or
     to acquire any Person  (including  such Party) that  directly or indirectly
     owns all or any part of its Contributed Business,  whether by merger, share
     exchange,  purchase  of stock,  purchase  of assets,  tender  offer,  joint
     venture  or  otherwise,  and  whether  for  cash,  securities  or any other
     consideration  or  combination   thereof,  if  such  transaction  would  be
     materially inconsistent with or preclusive of the transactions contemplated
     hereby (any such  inconsistent or preclusive  transaction being referred to
     herein as an "Alternative Transaction").  Such Party will immediately cease
     and  cause  to  be  terminated  any  existing   initiation,   solicitation,
     encouragement,  discussions  or  negotiations  with parties  other than the
     other Party commenced heretofore with respect to Alternative Transactions.

          (b) Notwithstanding the provisions of Section 3.9(a), in response to a
     proposal for an Alternative Transaction (an "Alternative Proposal") that is
     unsolicited  and made after the date  hereof,  (i) such Party may engage in
     discussions or negotiations  regarding such  Alternative  Proposal with the
     Person who makes such Alternative  Proposal and (ii) such Party may furnish
     to any such Person (subject to the execution of a confidentiality agreement
     containing confidentiality provisions substantially similar to those of the
     Confidentiality   Agreements)   confidential   or  non-public   information
     concerning such Party or its Affiliates.

          (c) Such Party shall immediately notify the other Party of its receipt
     of any Alternative  Proposal or any request for  confidential or non-public
     information  relating to such Party or its Affiliates in connection with an
     Alternative  Proposal or for access to the properties,  books or records of
     such Party or any Affiliate by any Person that it is considering making, or
     has made, an Alternative Proposal.


                                    SECTION 4

                              CONDITIONS TO CLOSING
                              ---------------------

     4.1 Conditions  Precedent to  Obligations  of Both Parties.  The respective
obligations of the Parties to consummate the  transactions  contemplated by this
Agreement  shall be subject to the  satisfaction on or prior to the Closing Date
of each of the following conditions:

          (a) No  Injunction,  etc. No  preliminary  or permanent  injunction or
     other order issued by any federal or state court of competent  jurisdiction
     in the United States or by any United States federal or state  governmental
     or regulatory  body or any statute,  rule,  regulation  or executive  order
     promulgated or enacted by any United States  federal or state  governmental
     authority  shall  be in  effect  which  materially  restrains,  enjoins  or
     otherwise  prohibits (i) the  transactions  contemplated  hereby;  (ii) the
     ownership by the  Partnership  (including  enjoyment of any rights relating
     thereto) of the Contributed  Businesses at and after the Closing;  or (iii)
     the operation of the Contributed Businesses by the Partnership at and after
     the Closing;  and no proceeding  seeking any such injunction or order shall
     be pending;  provided,  that before any determination is made to the effect
     that this  condition  has not been  satisfied,  each  Party  shall each use
     commercially  reasonable  efforts to have such order or injunction  lifted,
     vacated or dismissed.

          (b)  Tier  2  Related  Agreements.  The  Parties  shall  have  reached
     agreement with respect to definitive  execution forms of the Tier 2 Related
     Agreements in accordance with Section 1.3.

          (c) Government Licenses and Consents.  The Parties shall have obtained
     and  effected  all  Government  Licenses  and  Consents  required  from any
     Authority for the consummation of the transactions  contemplated  hereunder
     and under the  Related  Agreements  to be entered  into at the  Closing and
     required  to allow  for the  prudent  and  uninterrupted  operation  of the
     Contributed  Businesses  by the  Partnership  after the Closing in a manner
     consistent with past practices,  except for those  Government  Licenses and
     Consents, the absence of which is not, in the aggregate,  reasonably likely
     to have a Material Adverse Effect.

          (d)  Stockholder  Approvals.  The  stockholders of Lyondell shall have
     duly  approved  the  transfer  of  Lyondell's  Contributed  Business to the
     Partnership  contemplated  hereby, and the stockholders of Millennium shall
     have duly approved the transfer of Millennium's Contributed Business to the
     Partnership contemplated hereby.

          (e) Bank Credit Facility.  The Partnership shall have entered into the
     bank credit  agreement or  agreements  contemplated  by Section 1.6 and the
     conditions  precedent to the  availability of funds  thereunder  shall have
     been   satisfied   (subject  only  to  the  closing  of  the   transactions
     contemplated by this Agreement).

          (f) Initial  Strategic Plan and Annual Budget.  The Parties shall have
     agreed upon the initial  Five-Year  Strategic  Plan and the initial  Annual
     Budget for the Partnership, as contemplated by the Partnership Agreement.

     4.2 Conditions  Precedent to Obligations  of Lyondell.  The  obligations of
Lyondell  under this  Agreement  are subject to the  satisfaction  (or waiver by
Lyondell) on or prior to the Closing Date of each of the following conditions:

          (a) Closing  Amendments  Certificate.  The Millennium  Group's Closing
     Amendments  Certificate (if any) shall have been acceptable to the Lyondell
     Group (or the Lyondell  Group shall have  determined to waive the condition
     that such Closing Amendments Certificate be acceptable), and Lyondell shall
     have executed it as the Lyondell Group's representative.

          (b) Accuracy of Representations  and Warranties.  Notwithstanding  any
     investigation,  inspection or  evaluation  conducted or notice or Knowledge
     obtained  by any member of the  Lyondell  Group  (including  any  Knowledge
     obtained as a result of receipt of a Closing  Amendment  Certificate),  all
     representations  and  warranties  (as amended  pursuant  to the  Millennium
     Group's Closing  Amendments  Certificate,  if applicable) of members of the
     Millennium  Group  contained in this  Agreement and the Related  Agreements
     that contain  qualifications  and  exceptions  relating to  materiality  or
     Material  Adverse Effect shall be true and correct on and as of the Closing
     Date, and all other  representations  and warranties of the members of such
     Group  contained  in such  agreements  shall  be true  and  correct  in all
     material  respects as of the Closing Date, in each case with the same force
     and effect as though such  representations  and warranties had been made on
     and as of the Closing Date.

          (c) Performance of Agreements.  Millennium and its Affiliates shall in
     all material  respects have performed and complied with all obligations and
     agreements  contained in this  Agreement,  and executed all  agreements and
     documents  (including the Tier 1 Related  Agreements and the Tier 2 Related
     Agreements) to be performed,  complied with or executed by it or them on or
     prior to the Closing Date.

          (d) No Material Adverse Change.  After the date of this Agreement,  no
     event,  occurrence  or other matter shall have  occurred that is reasonably
     likely to have a Material  Adverse  Effect with respect to the  Contributed
     Business of  Millennium,  provided  that this  determination  shall be made
     without regard to any change in general economic or political conditions or
     any change in raw materials  prices,  product prices,  industry capacity or
     other matter of  industry-wide  application  that  affects the  Contributed
     Businesses of both Parties in a substantially similar way.

          (e) Third Party  Consents.  All  Consents of any third party listed on
     Schedule 4.2(e) shall have been obtained.

          (f) Officer's Certificate. Lyondell shall have received a certificate,
     dated the Closing  Date,  signed by the  President  or a Vice  President of
     Millennium  to  the  effect  that,  to the  Knowledge  of  Millennium,  the
     conditions specified in the above paragraphs have been fulfilled.

     4.3 Conditions  Precedent to Obligations of Millennium.  The obligations of
Millennium  under this Agreement are subject to the  satisfaction  (or waiver by
Millennium) on or prior to the Closing Date of each of the following conditions:

          (a) Closing  Amendments  Certificate.  The  Lyondell  Group's  Closing
     Amendments   Certificate  (if  any)  shall  have  been  acceptable  to  the
     Millennium  Group (or the Millennium  Group shall have  determined to waive
     the condition that such Closing Amendments Certificate be acceptable),  and
     Millennium shall have executed it as the Millennium Group's representative.

          (b) Accuracy of Representations  and Warranties.  Notwithstanding  any
     investigation,  inspection or  evaluation  conducted or notice or Knowledge
     obtained by such member of the  Millennium  Group  (including any Knowledge
     obtained as a result of receipt of a Closing  Amendment  Certificate),  all
     representations and warranties (as amended pursuant to the Lyondell Group's
     Closing Amendments  Certificate,  if applicable) of members of the Lyondell
     Group  contained in this Agreement and the Related  Agreements that contain
     qualifications  and exceptions  relating to materiality or Material Adverse
     Effect  shall be true and  correct on and as of the Closing  Date,  and all
     other representations and warranties of the members of such Group contained
     in such agreements shall be true and correct in all material respects as of
     the  Closing  Date,  in each case with the same  force and effect as though
     such  representations and warranties had been made on and as of the Closing
     Date.

          (c)  Performance of Agreements.  Lyondell and its Affiliates  shall in
     all material  respects have performed and complied with all obligations and
     agreements  contained in this  Agreement  and executed all  agreements  and
     documents  (including the Tier 1 Related  Agreements and the Tier 2 Related
     Agreements) to be performed,  complied with or executed by it or them on or
     prior to the Closing Date.

          (d) No Material Adverse Change.  After the date of this Agreement,  no
     event,  occurrence  or other matter shall have  occurred that is reasonably
     likely to have a Material  Adverse  Effect with respect to the  Contributed
     Business  of  Lyondell,  provided  that  this  determination  shall be made
     without regard to any change in general economic or political conditions or
     any change in raw materials  prices,  product prices,  industry capacity or
     other matter of  industry-wide  application  that  affects the  Contributed
     Businesses of both Parties in a substantially similar way.

          (e) Third Party  Consents.  All  Consents of any third party listed on
     Schedule 4.3(e) shall have been obtained.

          (f)   Officer's   Certificate.   Millennium   shall  have  received  a
     certificate,  dated the Closing  Date,  signed by the  President  or a Vice
     President of Lyondell to the effect that, to the Knowledge of Lyondell, the
     conditions specified in the above paragraphs have been fulfilled. 


                                   SECTION 5

                             TERMINATION AND WAIVER
                             ----------------------

     5.1  General.  This  Agreement  may  be  terminated  and  the  transactions
contemplated  herein and in the Related  Agreements may be abandoned at any time
prior to the Closing:

          (a) by the written consent of both Parties;

          (b) by  Lyondell if there has been a material  misrepresentation  or a
     breach of an agreement by  Millennium  in this  Agreement  that (i) if such
     misrepresentation or breach existed on the Closing Date, would constitute a
     failure to satisfy the  conditions  to Closing set forth in Section  4.2(b)
     and (ii) has not been cured and cannot  reasonably  be cured within 30 days
     after all other conditions to Closing have been satisfied;

          (c) by Millennium if there has been a material  misrepresentation or a
     breach of an  agreement  by  Lyondell  in this  Agreement  that (i) if such
     misrepresentation or breach existed on the Closing Date, would constitute a
     failure to satisfy the  conditions  to Closing set forth in Section  4.3(b)
     and (ii) has not been cured and cannot  reasonably  be cured within 30 days
     after all other conditions to Closing have been satisfied;

          (d) by Lyondell or by Millennium if after the date hereof and prior to
     the Closing any final,  non-appealable  order or injunction shall be issued
     by any  federal  or state  court of  competent  jurisdiction  in the United
     States or by any United States Authority, or any Legal Requirement shall be
     promulgated or enacted by any United States Authority,  that would have the
     effect of prohibiting or making unlawful the performance of this Agreement,
     the  execution,  delivery or  performance  of any Related  Agreement or the
     consummation of the Closing;

          (e) by either  Lyondell  or  Millennium  in the event that the Closing
     does not occur  for any  reason on or  before  March  31,  1998;  provided,
     however,  that if the Closing  does not occur due to the act or omission of
     one of the Parties, that Party may not terminate this Agreement pursuant to
     the provisions of this Section;

          (f) by Lyondell,  upon approval of the Lyondell Board of Directors, if
     prior to the Closing Date (i) without  violation  of Section 3.9,  Lyondell
     shall have received after the date hereof an Alternative Proposal, (ii) the
     Lyondell Board of Directors shall have  determined,  in the exercise of its
     good faith  judgment  and after  consultation  with its legal  counsel  and
     receipt  of a  written  opinion  from  its  financial  advisors,  that  the
     Alternative  Transaction  contemplated  by such  Alternative  Proposal  (if
     consummated  pursuant to its terms) would be materially more favorable from
     a financial point of view to Lyondell or its  stockholders,  as applicable,
     than the  transactions  contemplated  by this  Agreement and (iii) Lyondell
     shall have given  Millennium  at least five  Business  Days' prior  written
     notice of the material  terms and conditions of such  Alternative  Proposal
     and  of  its  intention  to  terminate  this  Agreement  pursuant  to  this
     provision, in order to effect such Alternative Proposal; provided, however,
     that such  termination  under this clause (f) shall not be  effective,  and
     Lyondell  shall  not be  entitled  to  enter  into a  definitive  agreement
     providing for an Alternative  Transaction,  until Lyondell has made payment
     to Millennium of the fee required to be paid pursuant to Section 5.3(a);

          (g) by Millennium, upon approval of the Millennium Board of Directors,
     if  prior to the  Closing  Date  (i)  without  violation  of  Section  3.9,
     Millennium  shall  have  received  after  the date  hereof  an  Alternative
     Proposal, (ii) the Millennium Board of Directors shall have determined,  in
     the  exercise of its good faith  judgment and after  consultation  with its
     legal counsel and receipt of a written opinion from its financial advisors,
     that the Alternative Transaction  contemplated by such Alternative Proposal
     (if  consummated  pursuant to its terms) would be materially more favorable
     from a  financial  point  of view to  Millennium  or its  stockholders,  as
     applicable,  than the transactions contemplated by this Agreement and (iii)
     Millennium  shall have given  Lyondell at least five  Business  Days' prior
     written  notice of the material  terms and  conditions of such  Alternative
     Proposal and of its intention to terminate this Agreement  pursuant to this
     provision, in order to effect such Alternative Proposal; provided, however,
     that such  termination  under this clause (g) shall not be  effective,  and
     Millennium  shall not be  entitled  to enter  into a  definitive  agreement
     providing for an Alternative Transaction, until Millennium has made payment
     to Lyondell of the fee required to be paid pursuant to Section 5.3(b);

          (h) by  Lyondell,  if the  Millennium  Board of  Directors  shall have
     resolved  to  accept  or  recommended  to the  Millennium  stockholders  an
     Alternative Proposal or shall have withdrawn or adversely modified or taken
     a  public   position   materially   inconsistent   with  its   approval  or
     recommendation  to the  stockholders  of  Millennium of the transfer of its
     Contributed Business contemplated hereby;

          (i) by  Millennium,  if the  Lyondell  Board of  Directors  shall have
     resolved  to  accept  or  recommended  to  the  Lyondell   stockholders  an
     Alternative Proposal or shall have withdrawn or adversely modified or taken
     a  public   position   materially   inconsistent   with  its   approval  or
     recommendation  to the  stockholders  of  Lyondell  of the  transfer of its
     Contributed Business contemplated hereby;

          (j) by Lyondell,  if (i) a Change of Control of Millennium  shall have
     occurred,  (ii) Millennium  shall have entered into a definitive  agreement
     providing  for,  or  publicly   announced  its  intention  to  effect,  any
     transaction  involving a Change of Control of  Millennium 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  Millennium
     described in clause (c) of the definition of "Change of Control";

          (k) by  Millennium,  if (i) a Change of Control of Lyondell shall have
     occurred,  (ii)  Lyondell  shall have entered  into a definitive  agreement
     providing  for,  or  publicly   announced  its  intention  to  effect,  any
     transaction  involving  a Change of Control of  Lyondell  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  Lyondell
     described in clause (c) of the definition of "Change of Control;" and

          (l) by either Party, if the approval of the stockholders of such Party
     or the other Party  contemplated  by Section  4.1(d) is not obtained at the
     applicable stockholders meeting, including adjournments thereof.

Any right of  termination  set forth above shall be exercised by written  notice
from the terminating Party to the other Party.

     5.2  Effect  of  Termination.  In the  event  of any  termination  of  this
Agreement as provided above,  this Agreement shall forthwith  become wholly void
and of no further  force and effect and there shall be no  liability on the part
of any Party,  its  Subsidiaries  or their  respective  officers  or  directors;
provided, however, that upon any such termination the obligations of the Parties
with respect to this Section 5, expenses under Section 6.10 and  confidentiality
under  Section 6.6 shall remain in full force and effect and if the  Partnership
has  been  formed  the  Parties  shall  dissolve  it,  or  shall  cause it to be
dissolved;  and provided,  further,  that nothing  herein will relieve any party
from liability for damages for any breach of this Agreement.

     5.3 Termination Fees.

          (a) If this  Agreement is terminated  by Lyondell  pursuant to Section
     5.1(f) or by  Millennium  pursuant to Section  5.1(i) or (k), then Lyondell
     shall pay Millennium a fee of $40 million;  provided,  however, that no fee
     shall be payable  following a  termination  of this  Agreement  pursuant to
     Section  5.1(k)(iii) unless and until the relevant tender offer or exchange
     offer has been consummated and a Change of Control of Lyondell described in
     clause (c) of the definition of "Change of Control" has occurred.

          (b) If this Agreement is terminated by Millennium  pursuant to Section
     5.1(g) or by Lyondell  pursuant to Section  5.1(h) or (j), then  Millennium
     shall pay Lyondell a fee of $40  million;  provided,  however,  that no fee
     shall be payable  following a  termination  of this  Agreement  pursuant to
     Section  5.1(j)(iii) unless and until the relevant tender offer or exchange
     offer has been consummated and a Change of Control of Millennium  described
     in clause (c) of the definition of "Change of Control" has occurred.

          (c) If (i) this Agreement is terminated prior to the occurrence of the
     Closing  for any reason  other than  failure to satisfy the  condition  set
     forth in Section 4.1(a) or the  termination  of this Agreement  pursuant to
     Section  5.1(a) or Section  5.1(d),  (ii) prior to such date as is 180 days
     after such termination  there shall occur a Change of Control of a Party or
     a Party shall enter into a  definitive  agreement  providing  for, or shall
     publicly  announce its  intention to effect,  any  transaction  involving a
     Change of Control of such Party or involving the sale or other  disposition
     of all or  substantially  all of the  Contributed  Business  of such  Party
     (including  by transfer to a joint  venture or similar  arrangement)  to or
     with an unaffiliated  Person or a tender offer or exchange offer shall have
     been commenced or publicly  announced that, if consummated,  would have the
     effect with respect to a Party described in clause (c) of the definition of
     "Change of Control" and (iii) no fee has previously been paid by such Party
     pursuant  to  Section  5.3(a)  or  (b),  then  upon  (and  subject  to) the
     occurrence  of  such  Change  of  Control  or  the   consummation  of  such
     transaction,  such Party will pay to the other Party a fee of $40  million;
     provided,  however,  that such fee shall  instead  be $10  million  if this
     Agreement is terminated  pursuant to Section  5.1(l) because of the failure
     of the  stockholders  of such Party to approve the transfer of such Party's
     Contributed  Business and at or prior to the time of such  stockholder vote
     (1) there had been no public  disclosure or  announcement  by any Person of
     (x)  any  such  Change  of  Control,  definitive  agreement,  intention  or
     transaction  regarding such Party or (y) any Alternative  Proposal that has
     been made to such  Party and (2) the Board of  Directors  of such Party had
     not withdrawn or adversely  modified or taken a public position  materially
     inconsistent  with its approval or  recommendation  to the  stockholders of
     such  Party  of  the   transfer  of  such  Party's   Contributed   Business
     contemplated hereby.

          (d) Any  such  amount  shall  be paid  in  cash  by wire  transfer  in
     immediately  available  funds, (i) in the case of Section 5.1(f) or (g), at
     or prior to the  termination  referred  to therein  and (ii) in the case of
     Section  5.1(h),  (i), (j) or (k) or Section  5.3(c),  not later than seven
     Business Days after the obligation to make such payment arises.


                                    SECTION 6

                                  MISCELLANEOUS
                                  -------------

     6.1 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 each of the Parties.  Neither Party may  otherwise  assign or delegate any of
its rights or obligations under this Agreement without the prior written consent
of the other Party,  which consent shall be in the sole and absolute  discretion
of such other Party. Any purported assignment or delegation without such consent
shall be void and ineffective.

     6.2 Benefits of Agreement  Restricted  to Parties.  This  Agreement is made
solely for the benefit of the Parties and for the benefit of the  Partnership as
third party  beneficiary,  and no other Person (including  employees) shall have
any right, claim or cause of action under or by virtue of this Agreement.

     6.3  Notices.  All  notices,  requests  and other  communications  that 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  commercial
courier or other hand delivery, as follows:

Jeffery R. Pendergraft                    George H. Hempstead, III
Senior Vice President,                    Senior Vice President,
  General Counsel & Secretary               Law and Administration and Secretary
Lyondell Petrochemical Company            Millennium Chemicals Inc.
1221 McKinney Street                      99 Wood Avenue South
Houston, Texas 77010                      Iselin, New Jersey 08830
Telecopy Number:  713-652-4538            Telecopy Number: 908-603-6857

with a copy to:                                    with a copy to:

Baker & Botts, L.L.P.                     Weil, Gotshal & Manges LLP
910 Louisiana Street                               767 Fifth Avenue
Houston, Texas  77002                     New York, New York  10153
Attention:  Stephen A. Massad             Attention:  Ellen J. Odoner
Telecopy Number:  (713) 229-1522          Telecopy Number:  (212) 310-8007

     6.4  Severability.  In the event that any provision 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 of the Parties,  be deemed
severed from this Agreement and every other  provision of this  Agreement  shall
remain in full force and effect.

     6.5 Press Releases.  Unless otherwise  mutually agreed, no Party shall make
or authorize any public release of information  regarding the Partnership or any
other matters  contemplated by, or any provisions or terms of, this Agreement or
the  Related  Agreements  except (i) that a press  release or press  releases in
mutually agreed upon form or forms shall be issued by the Parties as promptly as
is practicable following the execution of this Agreement,  (ii) that the Parties
may, after consultation with each other, communicate with employees,  customers,
suppliers, stockholders, lenders, lessors, and other particular groups as may be
necessary or appropriate and not  inconsistent  with the prompt  consummation of
the  transactions  contemplated  by this Agreement and (iii) after  consultation
with each other,  as required by law or stock  exchange rule or as necessary for
the assertion or enforcement of contractual rights.

     6.6  Confidentiality  Agreements.  The Parties have heretofore entered into
the Confidentiality Agreements relating to the exchange between Lyondell, on the
one hand, and Millennium  and Millennium  Petrochemicals,  on the other hand, of
certain   confidential   information  related  or  otherwise  pertinent  to  the
transactions contemplated by this Agreement.  Nothing in this Agreement shall be
construed as impairing or otherwise limiting the obligations assumed pursuant to
the  Confidentiality  Agreements  by the parties  thereto.  The  Confidentiality
Agreements  shall  remain in full  force and  effect in  accordance  with  their
respective  terms  until the earlier of Closing or their  respective  expiration
dates.

     6.7 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 genders; and (vii) each exhibit,  appendix,
attachment and schedule to this Agreement is a part of this Agreement.

     6.8   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.

     6.9  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.

     6.10 Transaction Costs.

          (a)  Subject to  subsection  (b),  and except as  provided on Schedule
     6.10, all reasonable out-of-pocket costs, fees and expenses incurred at any
     time by either Party in  connection  with the  negotiation,  execution  and
     delivery  of  this  Agreement  and  the  consummation  of the  transactions
     contemplated  hereby shall be  reimbursed  by the  Partnership  or shall be
     shared by the Parties pro rata in accordance with the relative interests of
     their Subsidiaries in the Partnership.

          (b)  Notwithstanding  the  foregoing,   each  Party  shall  be  solely
     responsible for and bear all of its own respective costs, fees and expenses
     if this Agreement is terminated and the Closing does not occur.

     6.11 Amendment.  All waivers,  modifications,  amendments or alterations of
this Agreement shall require the written approval of each of the Parties. Except
as  provided  in the  preceding  sentence,  no  action  taken  pursuant  to this
Agreement,  including any  investigation by or on behalf of any Party,  shall be
deemed to constitute a waiver by the Party taking such action of compliance with
any representations, warranties, covenants or agreements contained herein and in
any  documents  delivered or to be delivered  pursuant to this  Agreement and in
connection  with the  Closing  hereunder.  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.

     6.12  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,  AND
EACH OF THE PARTIES TO THIS  AGREEMENT  SHALL  MAINTAIN THE  APPOINTMENT OF SUCH
AGENT (OR A  SUBSTITUTE  AGENT)  FROM THE DATE  HEREOF  UNTIL THE EARLIER OF THE
CLOSING  DATE OR THE  TERMINATION  OF THIS  AGREEMENT  AND  SATISFACTION  OF ALL
OBLIGATIONS  HEREUNDER.  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 ON LACK
OF PERSONAL JURISDICTION, IMPROPER VENUE OR FORUM NON-CONVENIENS.

     6.13 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.



                            [signature pages follow]


<PAGE>


         IN WITNESS WHEREOF, this Master Transaction Agreement has been executed
on behalf of each of the Parties,  by their respective  officers  thereunto duly
authorized, effective as of the date first written above.

                                              LYONDELL PETROCHEMICAL COMPANY


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


                                               MILLENNIUM CHEMICALS INC.


                                                By:    /s/ William M. Landuyt
                                                Name:  William M. Landuyt
                                                Title: Chairman and Chief
                                                       Executive Officer




<PAGE>





                                     

                                   APPENDIX A
                                       TO
                          MASTER TRANSACTION AGREEMENT

                                   DEFINITIONS
                                   -----------

"Affiliate"  shall mean 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) Atlantic Richfield Company and any entities controlled by it shall
not be considered  an Affiliate of the Lyondell  Group,  (ii)  Suburban  Propane
Partners,  L.P. and any entities  controlled  by it shall not be  considered  an
Affiliate of the Millennium  Group,  and (iii) neither the  Partnership  nor any
entity  controlled by it shall be considered an Affiliate of the Lyondell  Group
or the Millennium  Group.  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.

"Agreement"  shall mean this Master  Transaction  Agreement entered into between
the Parties as of the date hereof.

"Asset  Contribution  Agreements"  shall mean for Lyondell  that  certain  Asset
Contribution  Agreement  between Lyondell and the Partnership and for Millennium
that certain Asset Contribution Agreement between Millennium  Petrochemicals and
the Partnership to be executed and delivered at the Closing in substantially the
form attached hereto as Exhibit B.

"Assumed Liabilities" of a Party shall have the meaning assigned to such term in
the Asset Contribution  Agreement for such Party and shall include, with respect
to Lyondell,  the Lyondell  Assumed Debt and,  with respect to  Millennium,  the
Millennium Assumed Debt.

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

"Business Day" shall mean any day other than a Saturday,  Sunday or other day on
which banks are closed in New York City, New York.

"Change of Control"  shall mean with respect to a Party the occurrence of any of
the following events: (a) there shall be consummated any  consolidation,  merger
or share exchange of such Party (i) in which such Party is not the continuing or
surviving  Person (other than a  consolidation,  merger or share exchange with a
wholly  owned  Subsidiary  of such Party in which all shares of common  stock of
such  Party  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  Party is
converted into cash,  securities or other property,  other than, in each case, a
consolidation,  merger or share  exchange  of such Party 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) all or substantially  all of such
Party's  properties  and assets on a  consolidated  basis are sold or  otherwise
disposed  of to any  Person or  Persons  in any one  transaction  or a series of
transactions, other than as contemplated by this Agreement; or (c) any Person or
any Persons  acting  together  which would  constitute a "group" for purposes of
Section 13(d) of the Exchange Act (other than such Party, any Subsidiary of such
Party,  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 Party or any Subsidiary of such
Party or any Person  holding  securities  of such Party 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 Exchange
Act) of 50% or more of the voting stock of such Party.

"Closing" shall  mean  the  closing  of  the  transactions contemplated by this 
Agreement.

"Closing  Amendments Certificate" shall have  the  meaning set forth in Section 
3.8.

"Closing Date" shall have the meaning set forth in Section 1.4.

"Confidentiality Agreements" shall mean those certain Confidentiality Agreements
separately  entered  into as of February 3, 1997 between the Parties and certain
of their  Affiliates  and binding upon such Parties and their  Affiliates as set
forth therein.

"Consent" shall mean any consent,  waiver, approval,  authorization,  exemption,
registration, license or declaration of or by any other Person or any Authority,
or any  expiration or  termination  of any  applicable  waiting period under any
Legal  Requirement,  required  with  respect  to any  Party or any  party to the
Related  Agreements  in  connection  with (i) the execution and delivery of this
Agreement or any of the Related  Agreements or (ii) the  consummation  of any of
the transactions provided for hereby or thereby.

"Contracts" of a Party shall have the meaning assigned to such term in the Asset
Contribution Agreement for such Party.

"Contributed  Assets" of a Party  shall have the  meaning  assigned  to the term
"Assets" in the Asset Contribution Agreement for such Party.

"Contributed  Business"  shall  mean,  with  respect  to  each of  Lyondell  and
Millennium,  its  "Contributed  Business"  as defined in the Asset  Contribution
Agreement  for  such  Party,   including  the  Contributed  Assets  and  Assumed
Liabilities related thereto.

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

"Exchange Act" shall mean the Securities Exchange Act of 1934.

"Filing"  shall mean any filing with any Person or any  Authority  required with
respect to any Party in  connection  with (i) the execution and delivery of this
Agreement or any of the Related  Agreements or (ii) the  consummation  of any of
the transactions provided for hereby or thereby.

"GAAP" shall have the meaning set forth in Section 2.5(b).

"Government  License" of a Party shall have the meaning assigned to such term in
the Asset Contribution Agreement for such Party.

"Lyondell" shall mean Lyondell Petrochemical Company, a Delaware corporation.

"Lyondell  Assumed Debt" shall mean debt issued by Lyondell  having an aggregate
principal  amount  of $745  million,  as  specified  in the  Asset  Contribution
Agreement with respect to Lyondell.

"Lyondell  Group" shall mean  Lyondell and the  Subsidiary  or  Subsidiaries  of
Lyondell to be formed to be a partner or partners in the Partnership.

"Group" shall mean the Lyondell Group or the Millennium Group, as appropriate.

"Joint Proxy  Statement"  shall mean the Joint Proxy Statement of Millennium and
Lyondell to be filed with the SEC under the Exchange Act, pursuant to which each
of Millennium and Lyondell will seek its stockholders'  approval of the transfer
of its Contributed Businesses to the Partnership as contemplated hereby.

"Millennium" shall mean Millennium Chemicals Inc., a Delaware corporation.

"Millennium  Assumed Debt" shall mean debt issued by  Millennium  Petrochemicals
having an aggregate  principal amount of $750 million, as specified in the Asset
Contribution Agreement with respect to Millennium.

"Millennium  Group" shall mean  Millennium,  Millennium  Petrochemicals  and the
Subsidiary  or  Subsidiaries  of  Millennium  to be formed  to be a  partner  or
partners in the Partnership.

"Millennium  Petrochemicals"  shall  mean  Millennium  Petrochemicals  Inc.,  a 
Virginia corporation.

"Knowledge" shall mean with respect to any Party the actual knowledge of (i) any
plant  manager,  (ii) any  officer of such Party  having  responsibilities  with
respect to the  Contributed  Business or the  transactions  contemplated in this
Agreement,   (iii)  in  the  case  of  Millennium,  any  officer  of  Millennium
Petrochemical having  responsibilities  with respect to the Contributed Business
or the  transactions  contemplated  in this  Agreement,  and (iv)  any  employee
reporting directly to an officer described in clause (ii) or (iii).

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

"Material  Adverse  Effect" shall mean 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 of the Party at issue taken as a whole.

"Parties" shall mean Lyondell and Millennium.

"Partnership" shall mean the partnership to be formed as contemplated hereby.

"Partnership Agreement" shall mean the partnership agreement of the Partnership.

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

"Proceeding"  shall mean any action,  suit,  claim or legal,  administrative  or
arbitration  proceeding or governmental  investigation  to which any Party or an
Affiliate is a party.

"Related  Agreements"  shall mean the Tier 1 Related  Agreements  and the Tier 2
Related Agreements.

"Securities Act" shall mean the Securities Act of 1933.

"SEC" shall mean the Securities and Exchange Commission.

"SEC Reports" shall have the meaning set forth in Section 2.5.

"Subsidiary"  shall mean,  with  respect to any Party,  any Person of which such
Party,  either directly or indirectly,  owns 50% or more of the equity or voting
interests,  including,  in the case of  Millennium  or  Lyondell,  each of their
respective Subsidiaries set forth on Exhibit 21 to (or otherwise incorporated by
reference  to) their  respective  Annual  Reports on Form 10-K for each of their
fiscal  years  ended  December  31,  1996  except,  in  the  case  of  Lyondell,
Lyondell-CITGO Refining Company Ltd.

"Tier 1 Related  Agreements"  shall  mean  those  agreements  so  designated  on
Appendix B, forms of each of which  (including forms of the exhibits and certain
of the  schedules  thereto  current  as of the  dates  indicated  therein),  are
attached hereto as Exhibits.

"Tier 2 Related  Agreements"  shall  mean  those  agreements  so  designated  on
Appendix B (including Appendix B-2),  descriptions of certain terms of which are
included thereon.


<PAGE>





                                   APPENDIX B
                                       TO
                          MASTER TRANSACTION AGREEMENT

                           LIST OF RELATED AGREEMENTS
                           --------------------------


Tier 1 Related Agreements

         1.        Partnership Agreement

         2.        Asset Contribution Agreements

                   a.      From Lyondell to the Partnership

                   b.      From Millennium to the Partnership

         3.        Parent Agreement


Tier 2 Related Agreements

         1.        Agreements  listed  as  exhibits  in the  table  of  contents
                   of  the  Asset Contribution Agreements.

         2.        Agreements listed on Appendix B-2.



<PAGE>






                                   APPENDIX C
                                       TO
                          MASTER TRANSACTION AGREEMENT

                             TERMS OF LYONDELL NOTE
                             ----------------------


            MAKER:      Lyondell subsidiary that is a partner in the Partnership

           AMOUNT:      $345 million
 
             TERM:      Earlier of 2 years  from  Closing  or 30 days  after a 
                        financing  at Lyondell-CITGO  Refining  Company Ltd.  
                        ("LCR")  which results in the repayment  of LCR's  
                        existing  $450  million  5-year  term loan and 
                        distribution to Lyondell of at least $345 million
      
             RATE:      6 month  LIBOR  plus  market  spread  for  applicable  
                        credit  rating (Lyondell)
     
          RIGHT OF 
          OFFSET/
         SECURITY:      In the event of a  default  under the  note,  Lyondell  
                        Group  waives right to  distribution  of proceeds  and 
                        assign  those  rights to the Partnership,  in which 
                        event the  amounts so withheld  will be deemed to be 
                        payments under the note
  
        COVENANTS:      Standard  affirmative  covenants  comparable to Lyondell
                        Assumed Debt (e.g., payment of interest, maintenance of
                        corporate existence)
    
            OTHER:      Prepayable at any time, without penalty or premium

                        Senior  note  entitled to equal and ratable  security  
                        with any holders of secured  debt issued by Lyondell or 
                        the maker  (subject to customary exceptions)

                        Cross-default  with other  Lyondell debt (including  
                        Lyondell  Assumed  Debt,  if such default is caused by
                        an action or  failure to act on the part  of  Lyondell)
                        exceeding  $25 million

        GUARANTOR:     Payments   of   interest   and   principal   shall   be 
                       fully and unconditionally  guaranteed  by  Lyondell, 
                       such  guarantee  to  be a senior  obligation  entitled to
                       equal and ratable  security  with any holders of Lyondell
                       secured debt (subject to customary exceptions)
  


<PAGE>


                                   APPENDIX D
                                       TO
                          MASTER TRANSACTION AGREEMENT

                        TERMS OF BANK CREDIT AGREEMENT(S)
                        ---------------------------------


TERMS AND  CONDITIONS  FOR $1.0 BILLION  BANK  CREDIT AGREEMENT AND $250 MILLION
WORKING CAPITAL FACILITY

TENOR:     5 Year revolver

RATE:      LIBOR + appropriate spread, ability to swap to fixed

SECURITY:  Unsecured

COVENANTS: Commensurate with investment grade credit rating

OTHER:     Any bank proposal to amend or modify business agreement will be
           unacceptable

GUARANTEE: Millennium  America  Inc.,  a wholly owned  subsidiary  of  
           Millennium,  will  guarantee  $750 million of borrowings under this 
           Agreement.


<PAGE>





         LYONDELL AND MILLENNIUM COMBINE OLEFINS AND POLYMERS BUSINESSES
                   TO CREATE NEW $5 BILLION CHEMICAL COMPANY

Jointly-Owned Venture Expected to Improve Annual Profitability by $150 Million
and Reduce Effects of Industry Cyclicality on its Parent Companies

     Houston,  TX,  Iselin,  NJ and  London,  England--July  28,  1997--Lyondell
Petrochemical  Company  (NYSE:LYO)and  Millennium Chemicals Inc. (NYSE:MCH) have
signed a definitive  agreement to form a new venture,  with expected revenues of
approximately  $5 billion,  comprised  primarily  of the  olefins  and  polymers
businesses of the two companies.

     The new  company is expected  to be the  largest  producer of ethylene  and
polyethylene in North America. It will consist of 13 manufacturing facilities on
the U.S.  Gulf Coast and in the U.S.  Midwest,  producing  ethylene,  propylene,
polyethylene,   polypropylene,   ethyl  alcohol  and  associated  products.  The
combination   will  create  a  strong  financial  entity  with  book  assets  of
approximately  $5 billion.  it plans to have $1.745 billion of debt,  witha note
receivable from Lyondell of $345 million,  and  substantial  free cash flow. 

     The new venture company,  which will be operated as a partnership,  will be
owned 57% by Lyondell and 43% by Millennium.  The venture's governance structure
will include a six-person committee,  co-chaired by Dan F. Smith,  President and
Chief Executive Officer of Lyondell, and William M. Landuyt,  Chairman and Chief
Executive  Officer  of  Millennium.  Smith  also will  serve as Chief  Executive
Officer of the venture company, which will be headquaretered in Houston, Texas.

The Venture  Creates Value Through Cost  Reductions,  Operating  Efficiency
Improvements and Broader Product Mix 

     "We will create a new world class  chemical  company  with  enhanced  asset
utilization  and a leading  cost  position  across a broad line of  products  by
blending  assets,  employees  and operating  capabilities  from  Millennium  and
Lyondell," said Dan F. Smith.  "The  extraordinary  fit of these businesses will
provide  higher  earnings  power and create  unique value that we expect will be
differential in the industry."

     "The venture will have one of the broadest  product  lines in the industry,
with  extensive  product  development  and  research  capabilities  and the best
employees  from each  organization,  enabling it to better  serve  customers  in
rapidly growing markets," said William M. Landuyt.

     The  partnership  is expected to generate  more than $150 million in annual
pre-tax  profit  improvement.  Substantial  savings are  expected to be realized
early,  with the full $150 million annual  savings  achieved by the end of 1999.

     Cost improvements  will be achieved in such areas as eliminating  duplicate
overhead and staffing, improved purchasing capabilities,  and better utilization
of existing logistics and distribution channels.

     Efficiency improvements will include such items as greater use of feedstock
flexibility,  expanding  the upgrade of  co-products  internally,  sharing  best
business practices, and optimizing production scheduling of polymer plants.

     Customers will benefit from the greater supply  flexibility  gained through
multiple  olefins  production  sites and polymers  customers will have access to
significantly broader resin product lines.

     "This  transaction is a major step in the execution of Lyondell's  strategy
to reduce  cyclicality  and grow the  petrochemicals  business  through  greater
integration and a broader  downstream product mix. It also advances our low cost
strategy  by  compounding  the  benefits of recent  cost  reduction  efforts and
building a base for future  improvements.  Increased cash flow generated by this
venture,  as well as our  interest  in  LYONDELL-CITGO  Refining  Company,  will
provide  Lyondell  with a greater  number of cash  allocation  options to create
shareholder  value than ever before in our history,"  said Smith. 

     Landuyt said,  "This  combination  helps fulfill  Millennium's  strategy to
maximize value  creationin our  polyethylene  and related  businesses by driving
down costs and by partnering  with an  organization  that shares our  relentless
focus on optimizing  synergistic  opportunities.  The transaction  also enhances
Millennium's  financial  flexibility to pursue  expansion of our specialties and
intermediates businesses thereby reducing the volatility of Millennium's overall
business portfolio."

Closing Expected this Year
     
     The  transaction,  which has been  unanimously  approved  by the  Boards of
Directors  of both  companies,  is  expected  to  close by year  end,  following
approval by both  companies'  stockholders  and  satisfaction  of certain  other
conditions.

The Venture Will Be Comprised of Quality People, Assets & Operating Capabilities

     Lyondell's  contribution to the new venture company includes the businesses
associated with the following operations:

     The olefins  business,  comprised of two olefins plants at the  Channelview
Petrochemical  Complex near Houston,  TX, with annual  capacities of 3.8 billion
pounds of ethylene and 2.2 billion pounds of propylene,  and related  facilities
for  the   manufacture   and  production  of  butadiene,   aromatics  and  other
co-products, as well as storage facilities at Mont Belview, TX.

     The polymers business, consisting of three manufacturing facilities located
in Pasadena,  Victoria and  Matagorda  County,  TX, with annual  capacities of 2
billion pounds of polymer resins.

     The technology  group and certain  business  functions  located in and near
Houston.

     The venture will assume primary responsibility for $745 million of existing
Lyondell  company  debt;  Lyondell  also will  remain  liable on this  debt.  In
addition, Lyondell will provide a $345 million note payable to the venture.

     Not included in the venture are Lyondell's  58% interest in  Lyondell-CITGO
Refining,  Ltd. (LCR) and its 75% interest in Lyondell Methanol (a joint venture
with MCN Investment Corp.).

     Millennium's   contribution  to  the  new  venture  company   includes  the
businesses  associated  with the  following  operations:  

     The olefins business  comprised of olefins plants at Clinton,  IA, LaPorte,
TX, and Morris, IL, with a total capacity of 3.8 billion pounds of ethylene.

     The polymers business  comprised of 4.8 billion pounds of polymers capacity
comprised of five manufacturing  facilities in Clinton, IA; Morris, IL; LaPorte,
Port Arthur and Chocolate Bayou, TX.

     The performance polymers business with manufacturing facilities in Tuscola,
IL; Fairport Harbor and Heath, OH; and Crockett,  TX. The synthetic  ethanol and
ethyl ether businesses with facilities at Tuscola,  IL; Newark, NJ; and Anaheim,
CA.

     Research and technology groups and a research center in Cincinnati, OH.

See list of plants and  capacities in Attachment I. 

     Millennium will receive $1 billion from the exchange:  The partnership will
assume $750 million of Millennium's inter-copany debt, which will be repaid from
the  proceeds of new bank debt to be arranged by the  partnership.  In addition,
Millennium will retain $250 million of accounts  receivable form the contributed
business.

     Not included in the venture are Millennium's interest in acetic acid, vinyl
acetate and methanol assets and  operations.  Also excluded from the transaction
are  Millennium  Inorganic  Chemicals,   Millennium  Specialty  Chemicals,   and
Millennium's equity interest in Suburban Propane Partners.

Executive Management Team Announced for New Venture
 
     The venture company will be governed by an owners'  committee  comprised of
representatives  of Millennium  and Lyondell.  Members of the owners'  committee
will include:

Dan F. Smith, President and CEO of Lyondell Petrochemical Company and CEO of the
venture -  Co-Chairman 
William M. Landuyt,  Chairman and CEO of Millennium  Chemicals Inc.- Co-Chairman
Dr.  Ronald H. Yocum,  President  and CEO of  Millennium  Petrochemicals  Inc. -
Member  
John E. Lushefski,  Senior Vice President and CFO of Millennium Chemicals Inc. -
Member
Jeffrey R. Pendergraft,  Senior Vice President,  Chief Administrative Officer of
Lyondell Petrochemical Company - Member 
Clifton B.  Currin,  Jr.,  Vice  President,  Corporate  Development  of Lyondell
Petrochemical Company - Member

     The  members  of the  executive  management  team  of the  venture  company
include: 

Eugene R. Allspach, President and Chief Operating Officer
Joseph M. Putz, Senior Vice President, Finance and Administration
Debra L. Starnes, Senior Vice President, Polyolefins
John R. Beard, Vice President, Manufacturing
J. R. Fontenot, Vice President, Engineering
Alan Houlton, Vice President, Customer Services
Gerald A. O'Brien, Vice President, Secretary
Myra J. Perkinson, Vice President, Human Resources
W. Norman Phillips, Jr., Vice President, Olefins
Kerry F. Williams, Vice President, Research and Development
Jeffrey L. Hemmer, Director, Business Process Improvement

     Lyondell  Petrochemical  Company  (web site:  www.lyondell.com)  is a major
commodity  petrochemical and polymers company with headquarters in Houston,  TX.
The company  manufactures and markets olefins  (primarily  ethylene,  propylene,
butadiene, butylenes and specialty products),  aromatics, methanol and MTBE, and
polymers (or polyolefins),  including high-density  polyethylene,  polypropylene
and low-density polyethylene. Lyondell is involved in petroleum refining through
its 58%  participation  interest in  LYONDELL-CITGO  Refining Company Ltd (LCR),
which produces refined petroleum products, including gasoline, low sulfur diesel
and jet fuel.  Lyondell  operates  a  methanol  business,  in which it has a 75%
ownership interest.

     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  was formed as a result of a  spin-off  from  Hanson  PLC, a UK public
company, on October 1, 1996.

Millennium Chemicals Inc. is

      the largest producer of polyethylene products in the United States;
      the second  largest  producer  of titanium  dioxide  (TiO2 ) in the United
      States and the  third-largest in the world; the second largest producer of
      acetic  acid and vinyl  acetate  monomer in the United  States;  a leading
      producer of high value-added performance polymers,  color concentrates and
      polymeric powders and other products, including titanium tetrachloride, 
          cadmium/selenium pigments and silica gel;
      and a leading producer of fragrance and flavor chemicals.

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 companies' Securities and Exchange Commission filings.

For inquiries, please call:
Lyondell                                           Millennium Chemicals
Media: Jackie Wilson (713) 652-4596 or             Investors and Media:
David Harpole (713) 652-4125                       Mickey Foster (732) 603-6777
Investors: Kevin DeNicola (713) 652-4590




<PAGE>

<TABLE>

                     MANUFACTURING OPERATIONS OF THE VENTURE
<CAPTION>
<S>                                  <C>                                 <C>    

Location                             Principal products                  Annual capacity

Channelview, Texas                   Ethylene                            3.8 billion pounds
                                     Propylene                           2.2 billion pounds
                                     Butadiene                           615 million pounds
                                     Benzene                             90 million gallons
                                     Toluene                             40 million gallons
                                     Dicyclopentadiene (DCPD)            80 million pounds
                                     Isoprene                            108 million pounds
                                     Resin oil                           120 million pounds
                                     Piperylenes                         100 million pounds                    
                                     Alkylate                            22,000 barrels per day
                                     MTBE                                13,000 barrels per day

Chocolate Bayou, Texas               High -density polyethylene          400 million pounds

Crockett, Texas                      Wire & cable compounds, color       120 million pounds
                                     and  additive concentrates

LaPorte, Texas                       Ethylene                            1.74 billion pounds
                                     Low-density polyethylene            395 million pounds
                                     Linear-low density polyethylene     480 million pounds
                                     High-density polyethylene           545 million pounds

Matagorda County, Texas              High-density polyethylene           1,050 million pounds

Pasadena, Texas (Bayport plant)      Polypropylene                       400 million pounds
                                     Low-density polyethylene            140 million pounds

Port Arthur, Texas                   Low-density polyethylene            190 million pounds
                                     High-density polyethylene           540 million pounds

Victoria, Texas                      High-density polyethylene           450 million pounds

Morris, Illinois                     Ethylene                            1.13 billion pounds
                                     Low-density polyethylene            540 million pounds
                                     Linear low density polyethylene     650 million pounds
                                     Polypropylene                       280 million pounds

Tuscola, Illinois                    Ethyl alcohol                       50 million gallons
                                     Diethyl ether                       5 million gallons
                                     Compounds for wire & cable          36 million pounds
                                     Microfine polyolefin powders        10 million pounds      

Clinton, Iowa                        Ethylene                            960 million pounds
                                     Low-density polyethylene            430 million pounds
                                     High-density polyethylene           450 million pounds
                                     
Fairport Harbor, Ohio                Wire & cable compounds, color       60 million pounds
                                     concentrates

Heath, Ohio                          Color, additive and foam            39 million pounds
                                     concentrates, performance
                                     compounds


</TABLE>



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