Document:

EX-10.9

 Exhibit 10.9 

FORM OF 
 AMENDED AND
RESTATED 
 AGREEMENT OF LIMITED PARTNERSHIP 

OF 
 WESTLAKE CHEMICAL
OPCO LP 
 DATED AS OF             , 2014 

 AMENDED AND RESTATED 

AGREEMENT OF LIMITED PARTNERSHIP 

OF 
 WESTLAKE CHEMICAL
OPCO LP 
 THIS AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF WESTLAKE CHEMICAL OPCO LP, dated as
of             , 2014, is entered into and executed by WESTLAKE CHEMICAL OPCO GP LLC, a Delaware limited liability company, as the General Partner, and WPT LLC, a Delaware limited
liability company, WESTLAKE PETROCHEMICALS LLC, a Delaware limited liability company, WESTLAKE LONGVIEW CORPORATION, a Delaware corporation, WESTLAKE VINYLS, INC., a Delaware corporation, and WESTLAKE CHEMICAL PARTNERS LP, a Delaware limited
partnership, as Limited Partners. 
 RECITALS 

WHEREAS, the Partnership (as defined below) was formed on May 6, 2014 pursuant to the Act (as defined below), subject to an Agreement of
Limited Partnership dated as of May 6, 2014 (the “Agreement of Limited Partnership”) entered into by WPT LLC, a Delaware limited liability company, as limited partner, and the General Partner (as defined below), as general partner;

 WHEREAS, the Partnership, through various transactions, issued additional limited partner interests in the Partnership to WPT LLC,
Westlake Petrochemicals LLC, Westlake Vinyls, Inc. and Westlake Longview Corporation; 
 WHEREAS, WPT LLC contributed a portion of its
limited partner interest in the Partnership to Westlake Chemical Partners LP; 
 WHEREAS, the General Partner and the Limited Partners now
desire to amend and restate the Agreement of Limited Partnership in its entirety upon the terms and conditions stated below; and 
 WHEREAS,
for U.S. federal income tax purposes, the General Partner is a disregarded entity and the general partner interest owned by the General Partner is treated as owned by Westlake Chemical Partners LP. 

NOW, THEREFORE, the Agreement of Limited Partnership is hereby amended and restated in its entirety as follows: 

ARTICLE I 

DEFINITIONS 
 The following
definitions shall for all purposes, unless otherwise clearly indicated to the contrary, apply to the terms used in this Agreement. 

“Act” means the Delaware Revised Uniform Limited Partnership Act, as amended from time to time, and any successor to
such act. 

  
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 “Adjusted Capital Account” means the Capital Account maintained for each
Partner (a) increased by any amounts that the Partner is deemed obligated to contribute or restore to the Partnership pursuant to the penultimate sentences of Treasury Regulations Sections 1.704-2(g)(1) and 1.704-2(i)(5), and
(b) decreased by any amounts described in Treasury Regulations Sections 1.704-1(b)(2)(ii)(d)(4), (5), or (6) with respect to such Partner. 

“Adjusted Capital Account Deficit” means a deficit balance in the Adjusted Capital Account of a Partner. 

“Affiliate” means, with respect to any Person, any other Person that directly or indirectly through one or more
intermediaries controls, is controlled by or is under common control with, the Person in question. As used herein, the term “control” means the possession, direct or indirect, of the power to direct or cause the direction of the management
and policies of a Person, whether through ownership of voting securities, by contract or otherwise. 
 “Agreement”
means this Amended and Restated Agreement of Limited Partnership of Westlake Chemical OpCo LP, as it may be amended, supplemented or restated from time to time. This Agreement shall constitute a “partnership agreement” as such term is
defined in the Act. 
 “Agreement of Limited Partnership” has the meaning set forth in the recitals. 

“Bad Faith” means with respect to any determination, action or omission, of any Person, board or committee, that such
Person, board or committee reached such determination, or engaged in or failed to engage in such act or omission, with the belief that such determination, action or omission was adverse to the interest of the Partnership. 

“Capital Account” means, with respect to any Partner, the capital account maintained for such Member in accordance
with the provisions of Section 5.1. 
 “Capital Contribution” means, with respect to any Partner, the
aggregate amount of cash and the initial Gross Asset Value of any property other than cash contributed to the Partnership by such Partner. Any reference in this Agreement to a Capital Contribution of a Partner shall include a Capital Contribution
contributed by its predecessors in interest. 
 “Certificate of Limited Partnership” means the Certificate of
Limited Partnership filed with the Secretary of State of the State of Delaware pursuant to which the Partnership was formed as a Delaware limited partnership and as described in the first sentence of Section 2.5, as amended or restated
from time to time. 
 “Code” means the Internal Revenue Code of 1986, as amended, and in effect from time to time.
Any reference herein to a specific section or sections of the Code shall be deemed to include a reference to any corresponding provision of any successor law. 

“Depreciation” means, for each Fiscal Year, an amount equal to the depreciation, amortization or other cost recovery
deduction allowable for federal income tax purposes with respect to an asset for the Fiscal Year as determined by the General Partner; provided that if the Gross Asset Value of an asset differs from its adjusted basis for federal income tax
purposes at 

  
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the beginning of the Fiscal Year or other period, Depreciation for the Fiscal Year or other period shall equal to the amount of book basis recovered for the Fiscal Year or other period under the
rules prescribed by Treasury Regulations Section 1.704-3(d)(2) and provided, further, that if the federal income tax depreciation, amortization or other cost recovery deduction for the
Fiscal Year or other period is zero, Depreciation shall be determined with reference to the beginning Gross Asset Value using any reasonable method selected by the General Partner. 

“Fiscal Year” has the meaning set forth in Section 2.6 of this Agreement. 

“General Partner” means Westlake Chemical OpCo GP LLC, a Delaware limited liability company, in its capacity as
the general partner of the Partnership, and any successor to Westlake Chemical OpCo GP LLC, as the general partner of the Partnership. 

“Gross Asset Value” means, with respect to any asset, such asset’s adjusted basis for federal income tax
purposes, except as follows: 
 (a) the initial Gross Asset Value of any asset contributed by a Partner to the Partnership shall be the gross
fair market value of such asset, as agreed to by the Partners; 
 (b) the Gross Asset Value of all Partnership assets shall be adjusted to
equal their respective gross fair market values, as determined by the Partners, in connection with: (i) the acquisition of an additional interest in the Partnership by any new or existing Partner in exchange for more than a de minimis
Capital Contribution; (ii) the distribution by the Partnership to a Partner of more than a de minimis amount of Partnership assets as consideration for an interest in the Partnership; (iii) the liquidation of the Partnership within
the meaning of Treasury Regulations Section 1.704-1(b)(2)(ii)(g) (other than pursuant to Section 708(b)(1)(B) of the Code); (iv) the issuance of a Noncompensatory Option; or (v) any other event to the extent determined by the
Partners to be necessary to properly reflect the Gross Asset Values in accordance with the standards set forth in Treasury Regulations Section 1.704-1(b)(2)(iv)(q); provided, however, that in the event of the issuance of an
interest in the Partnership pursuant to the exercise of a Noncompensatory Option where the right to share in Partnership capital represented by the Partnership interest differs from the consideration paid to acquire and exercise the Noncompensatory
Option, the Gross Asset Value of each Partnership asset immediately after the issuance of the Partnership interest shall be adjusted upward or downward to reflect any unrealized gain or unrealized loss attributable to the Partnership asset and the
Capital Accounts of the Partners shall be adjusted in a manner consistent with Treasury Regulations Section 1.704-1(b)(2)(iv)(s); and provided further, however, that adjustments pursuant to
clause (i) and clause (ii) of this sentence (or clause (iv) of this sentence in the event of the issuance of a Noncompensatory Option to acquire a de minimis Interest in the Partnership) shall be made only if the General
Partner reasonably determines that the adjustments are necessary or appropriate to reflect the relative economic interests of the Partners in the Partnership. If any Noncompensatory Options are outstanding upon the occurrence of an event described
in this paragraph (b)(i) through (b)(v), the Partnership shall adjust the Gross Asset Values of its properties in accordance with Treasury Regulations Sections 1.704-1(b)(2)(iv)(f)(1) and 1.704-1(b)(2)(iv)(h)(2). 

  
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 (c) the Gross Asset Value of any Partnership asset distributed to any Partner shall be the gross
fair market value of such asset on the date of distribution, as determined by the distributee Partner and the other Partners; and 
 (d) the
Gross Asset Values of Partnership assets shall be adjusted to reflect any adjustments to the adjusted basis of such assets pursuant to Code Section 734(b) (including Treasury Regulation Section 1.734-2(b)(1)), but only to the extent that
such adjustments are taken into account in determining Capital Accounts pursuant to Treasury Regulations Section 1.704-1(b)(2)(iv)(m); provided, however, that Gross Asset Value shall not be adjusted pursuant to this paragraph (d) to the
extent that an adjustment pursuant to paragraph (b) above is made in connection with a transaction that would otherwise result in an adjustment pursuant to this paragraph (d). 

If the Gross Asset Value of an asset has been determined or adjusted pursuant to paragraph (a), paragraph (b) or paragraph (d) above, such
Gross Asset Value shall thereafter be adjusted by the depreciation taken into account with respect to such asset for purposes of computing Profits and Losses. 

“Gross Liability Value” means, with respect to any liability of the Partnership described in Treasury
Regulations Section 1.752-7(b)(3)(i), the amount of cash that a willing assignor would pay to a willing assignee to assume the liability in an arm’s-length transaction. 

“Indemnitee” means (a) the General Partner, (b) any former General Partner, (c) any
Person who is or was an Affiliate of the General Partner or any former General Partner, (d) any Person who is or was a member, partner, director, officer, fiduciary or trustee of any Person which any of the preceding clauses of this definition
describes, (e) any Person who is or was serving at the request of the General Partner or any former General Partner or any Affiliate of the General Partner or any former General Partner as an officer, director, member, partner, fiduciary or
trustee of another Person, (provided, however, that that Person shall not be an Indemnitee by reason of providing, on a fee-for-services basis, trustee,
fiduciary or custodial services), and (f) any other Person the General Partner designates as an “Indemnitee” for purposes of this Agreement. 

“Law” means any applicable statute, law (including any obligation arising under the common law), rule,
regulation, ordinance, order, code, ruling, writ, injunction, decree or other official act of or by any Governmental Authority. 

“Limited Partner” means the Persons listed as Limited Partners on Schedule I, as it may be
updated, amended, supplemented or restated from time to time by the General Partner, and any other limited partner admitted to the Partnership from time to time following the date of this Agreement. 

“Noncompensatory Option” has the meaning set forth in Treasury Regulations
Section 1.721-2(f). 
 “Nonrecourse Deductions” shall have the meaning assigned to that term in
Treasury Regulation Section 1.704-2(b). 

  
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 “Partner” means the General Partner or any Limited Partner. 

“Partner Nonrecourse Debt” has the meaning set forth in Treasury Regulations Section
1.704-2(b)(4). 
 “Partner Nonrecourse Debt Minimum Gain” has the meaning
set forth in Treasury Regulations Section 1.704-2(i)(2). 
 “Partner Nonrecourse
Deductions” shall have the meaning assigned to that term in Treasury Regulation Section 1.704-2(i). 

“Partnership” means Westlake Chemical OpCo LP, a Delaware limited partnership. 

“Partnership Minimum Gain” shall have the meaning assigned to that term in Treasury Regulation
Section 1.704-2(d). 
 “Percentage Interest” means, with respect to any Partner, the percentage
set forth on Schedule I next to such Partner’s name under the heading “Percentage Interest.” The Percentage Interest with respect to the General Partner shall at all times be zero. 

“Person” or “person” means an individual or a corporation, firm, limited
liability company, partnership, joint venture, trust, unincorporated organization, association, governmental agency or political subdivision thereof or other entity. 

“Profits” or “Losses” means, for each Fiscal Year, an amount equal to the Partnership’s
taxable income or loss for such Fiscal Year, determined in accordance with Section 703(a) of the Code (but including in taxable income or loss, for this purpose, all items of income, gain, loss or deduction required to be stated separately
pursuant to Section 703(a)(1) of the Code), with the following adjustments: 
 (a) any income of the Partnership exempt from federal
income tax and not otherwise taken into account in computing Profits or Losses pursuant to this definition shall be added to such taxable income or loss; 

(b) any expenditures of the Partnership described in Section 705(a)(2)(b) of the Code (or treated as expenditures described in
Section 705(a)(2)(b) of the Code pursuant to Treasury Regulations Section 1.704-1(b)(2)(iv)(i)) and not otherwise taken into account in computing Profits or Losses pursuant to this definition shall be subtracted from such taxable income or
loss; 
 (c) in the event the Gross Asset Value of any Partnership asset is adjusted in accordance with paragraph (b) or paragraph
(c) of the definition of “Gross Asset Value,” the amount of such adjustment shall be taken into account as gain (if the adjustment increases the Gross Asset Value of the Partnership asset) or loss (if the adjustment decreases the
Gross Asset Value of the Partnership asset) from the disposition of such asset for purposes of computing Profits or Losses; 

  
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 (d) gain or loss resulting from any disposition of any Partnership asset with respect to which
gain or loss is recognized for federal income tax purposes shall be computed by reference to the Gross Asset Value of the asset disposed of, notwithstanding that the adjusted tax basis of such asset differs from its Gross Asset Value; 

(e) in lieu of the depreciation, amortization and other cost recovery deductions taken into account in computing such taxable income or loss,
there shall be taken into account Depreciation for such Fiscal Year or other period, computed in accordance with the definition of “Depreciation”; 

(f) to the extent an adjustment to the adjusted tax basis of any asset pursuant to Code Section 734(b) (including Treasury Regulation
Section 1.734-2(b)(1)) is required, pursuant to Treasury Regulation Section 1.704-1(b)(2)(iv)(m)(4), to be taken into account in determining Capital Account balances as a result of a distribution other than in liquidation of a
Partner’s interest in the Partnership, the amount of such adjustment shall be treated as an item of gain (if the adjustment increases the basis of the asset) or an item of loss (if the adjustment decreases such basis) from the disposition of
such asset and shall be taken into account for purposes of computing Profits or Losses; 
 (g) the Gross Liability Value of each liability of
the Partnership described in Treasury Regulations Section 1.752-7(b)(3)(i) will be adjusted at such times as are provided in this Agreement for an adjustment to the Gross Asset Values of the Partnership’s assets. The amount of any
adjustment will be treated as an item of loss (if the adjustment increases the Gross Liability Value of the liability) or an item of gain (if the adjustment decreases the Gross Liability Value of the liability); and 

(h) notwithstanding any other provisions of this definition, any items which are specially allocated pursuant to Section 7.2,
Section 7.3, or Section 10.2(b) shall not be taken into account in computing Profits or Losses. 

“Treasury Regulation” means the applicable Income Tax Regulations, including Temporary Regulations,
promulgated under the Code. Any and all references herein to a specific provision of a Treasury Regulation shall be deemed to refer to any corresponding successor provision. 

ARTICLE II 

ORGANIZATIONAL MATTERS 

Section 2.1 Formation. The General Partner and WPT LLC, as the initial limited partner, formed the Partnership as a limited
partnership pursuant to the provisions of the Act. The General Partner and the Limited Partners hereby enter into this Agreement to set forth the rights and obligations of the Partners and certain matters related thereto. Except as otherwise
provided herein, the rights and obligations of the Partners and the administration, dissolution and termination of the Partnership shall be governed by the Act. 

Section 2.2 Name. The name of the Partnership shall be, and the business of the Partnership shall be conducted under the name of,
“Westlake Chemical OpCo LP.” 

  
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 Section 2.3 Principal Office; Registered Office. 

(a) The principal office of the Partnership shall be at 2801 Post Oak Boulevard, Suite 600, Houston, Texas 77056, or such other place as the
General Partner may from time to time designate. The Partnership may maintain offices at such other places as the General Partner deems advisable. 

(b) The registered office of the Partnership required by the Act to be maintained in the State of Delaware shall be the office of the initial
registered agent named in the Certificate of Limited Partnership, or such other place as the General Partner may from time to time designate in the manner provided by law. The registered agent for service of process at such address shall be the
initial registered agent named in the Certificate of Limited Partnership, or such other person as the General Partner may designate in the manner provided by law. 

Section 2.4 Term. The Partnership commenced on the date the Certificate of Limited Partnership was filed pursuant to
Section 2.5 and shall continue in existence until an election by the General Partner to dissolve the Partnership. 

Section 2.5 Organizational Certificate. A Certificate of Limited Partnership of the Partnership has been filed with the Secretary
of State of the State of Delaware as required by the Act. The General Partner shall file or cause to be filed such other certificates or documents as may be required for the formation, operation and qualification of a limited partnership in the
State of Delaware and any jurisdiction in which the Partnership may elect to do business. The General Partner shall file or cause to be filed any necessary amendments to the Certificate of Limited Partnership and any such other certificates and
documents and do all things requisite to the maintenance of the Partnership as a limited partnership (or as a partnership in which the Limited Partners have limited liability) under the laws of the State of Delaware and any jurisdiction in which the
Partnership may elect to do business. 
 Section 2.6 Fiscal Year. The fiscal year of the Partnership shall be January 1 to
December 31. 
 ARTICLE III 

PURPOSE 
 The purpose and
business of the Partnership shall be to engage in any lawful activity for which limited partnerships may be organized under the Act. 

ARTICLE IV 
 CAPITAL
CONTRIBUTIONS; PERCENTAGE INTERESTS 
 No Partner shall have the obligation to make any additional capital contribution to the
Partnership. The Percentage Interests of the Partners are set forth on Schedule I, as such schedule may be updated, amended, supplemented or restated from time to time. 

  
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 ARTICLE V 

CAPITAL ACCOUNTS ALLOCATIONS 

Section 5.1 Capital Accounts. 

(a) A separate Capital Account shall be established and maintained for each Partner in accordance with the requirements of Treasury Regulations
Section 1.704-1(b)(2)(iv). The Capital Account of each Partner shall be maintained in accordance with the following provisions: 

(i) to such Partner’s Capital Account there shall be credited such Partner’s Capital Contributions, such
Partner’s distributive share of Profits, special allocations of income and gain, and the net amount of any Partnership liabilities that are assumed by such Partner or that are secured by any Partnership assets distributed to such Partner; 

(ii) to such Partner’s Capital Account there shall be debited the amount of cash and the Gross Asset Value of any
Partnership assets distributed to such Partner pursuant to any provision of this Agreement, such Partner’s distributive share of Losses, special allocations of loss and deduction, and the net amount of any liabilities of such Partner that are
assumed by the Partnership or that are secured by any property contributed by such Partner to the Partnership; 
 (iii) In
the event an interest is transferred in accordance with the terms of this Agreement, the transferee will succeed to the Capital Account of the transferor to the extent it relates to the transferred interest 

(iv) in determining the amount of any liability for purposes of this Section 5.1(a), there shall be taken into
account Section 752(c) of the Code and any other applicable provisions of the Code and the Treasury Regulations. 
 The foregoing provisions and the
other provisions of this Agreement relating to the maintenance of Capital Accounts are intended to comply with Treasury Regulations Section 1.704-1(b), and will be interpreted and applied in a manner
consistent with those Treasury Regulations. In the event the General Partner determines in good faith and on a commercially reasonable basis that it is prudent to modify the manner in which the Capital Accounts, or any debits or credits thereto are
computed in order to comply with those Treasury Regulations, the General Partner may make the modification. The General Partner also shall, in good faith and on a commercially reasonable basis, (a) make any adjustments to the Capital Accounts
that are necessary or appropriate to maintain equality between the aggregate Capital Accounts of the Partners and the amount of capital reflected on the Partnership’s balance sheet, as computed for book purposes, in accordance with Treasury
Regulations Section 1.704-1(b)(2)(iv)(q) and (b) make any appropriate modifications to the Capital Accounts in the event unanticipated events might otherwise cause this Agreement not to comply with
Treasury Regulations Section 1.704-1(b). 

  
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 ARTICLE VI 

DISTRIBUTIONS 

Section 6.1 Reserves and Distributions. From time to time, but not less often than quarterly, the General Partner shall review the
Partnership’s accounts and determine the amount of the Partnership’s available cash and appropriate reserves (including cash reserves for future maintenance capital expenditures, working capital, turnaround reserves and other matters), and
the Partnership shall make a distribution to the Partners of the available cash, subject to the reserves. The General Partner’s determination of the amount of distributions and reserves shall be made on its behalf by its sole member, Westlake
Chemical Partners LP. The General Partner may make such cash distributions as it may determine and without being limited to current or accumulated income or gains from any Partnership funds, including, without limitation, Partnership revenues,
capital contributions or borrowed funds; provided, that no such distribution shall be made if, after giving effect thereto, the liabilities of the Partnership exceed the fair market value of the assets of the Partnership. The General Partner
may, subject to the foregoing proviso, also cause the Partnership to distribute to the Partners other Partnership property or other securities of the Partnership or other entities. Except as provided in Section 10.2, all distributions shall be
made to the Partners in accordance with their Percentage Interests. 
 ARTICLE VII 

ALLOCATIONS 

Section 7.1 Profits. After giving effect to the special allocations set forth in Section 7.3 and Section 7.4, and except
as provided in Section 7.2 and Section 11.2(b), all Profits from operations for each Fiscal Year (or part thereof) shall be allocated to the Partners in the following order and priority: 

(a) First, to the General Partner until the General Partner has been allocated an amount equal to the excess, if any, of (i) the absolute
value of cumulative Losses allocated to the General Partner pursuant to Section 7.2(b) for all prior Fiscal Years, over (ii) the cumulative amount of Profits allocated to the General Partner pursuant this Section 7.1(a) for all prior
Fiscal Years; 
 (b) Second, to the Limited Partners in proportion to, and to the extent of, an amount equal to the excess, if any, of
(i) the absolute value of cumulative Losses allocated to each such Limited Partner pursuant to Section 7.2(a) for all prior Fiscal Years, over (ii) the cumulative Profits allocated to such Limited Partner pursuant to this
Section 7.1(b) for all prior Fiscal Years; and 
 (c) Third, to the Limited Partners accordance with their Percentage Interests. 

Section 7.2 Losses. After giving effect to the special allocations set forth in Section 7.3, and Section 7.4, and except
as provided in Section 10.2(b), all Losses from operations for each Fiscal Year (or part thereof) shall be allocated to the Partners in the following order and priority: 

  
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 (a) First, to the Limited Partners in accordance with their Percentage Interests; provided, no
Losses shall be allocated to any Limited Partner to the extent that such allocation would result in a Limited Partner having an Adjusted Capital Account Deficit; and 

(b) Second, to the General Partner. 
 To the
extent Losses allocated to a Limited Partner would cause such Limited Partner to have an Adjusted Capital Account Deficit at the end of any Fiscal Year, the Losses will be reallocated to the other Limited Partners to the extent such reallocation
will not cause any such Limited Partner to have an Adjusted Capital Account Deficit. If any Limited Partner receives an allocation of Losses otherwise allocable to another Limited Partner pursuant to this provision, such Limited Partner shall be
allocated Profits in subsequent Fiscal Years necessary to reverse the effect of such reallocation of Losses and such allocation of Profits (if any) shall be made before any other Profit allocations under Section 7.1. 

Section 7.3 Special Allocations. The following special allocations shall be made in the following order: 

(a) Minimum Gain Chargeback. Except as otherwise provided in Treasury Regulations
Section 1.704-2(f), notwithstanding any other provision of this Article 7, if there is a net decrease in Partnership Minimum Gain during any Fiscal Year, each Partner will be allocated items of
Partnership income and gain for the Fiscal Year (and, if necessary, subsequent Fiscal Years) in an amount equal to the Partner’s share of the net decrease in Partnership Minimum Gain, determined in accordance with Treasury Regulations Section 1.704-2(g). Allocations pursuant to the previous sentence will be made in proportion to the respective amounts required to be allocated to each Partner pursuant thereto. The items to be so allocated
shall be determined in accordance with Treasury Regulations Sections 1.704-2(f)(6) and 1.704-2(j)(2). This Section 7.3(a) is intended to comply with the
minimum gain chargeback requirement in Treasury Regulations Section 1.704-2(f) and will be interpreted consistently therewith. 

(b) Partner Minimum Gain Chargeback. Except as otherwise provided in Treasury Regulations
Section 1.704-2(i)(4), notwithstanding any other provision of this Article 7, if there is a net decrease in Partner Nonrecourse Debt Minimum Gain attributable to a Partner Nonrecourse Debt during any
Fiscal Year, each Partner who has a share of the Partner Nonrecourse Debt Minimum Gain attributable to that Partner Nonrecourse Debt, determined in accordance with Treasury Regulations
Section 1.704-2(i)(5), will be allocated items of Partnership income and gain for the Fiscal Year (and, if necessary, subsequent Fiscal Years) in an amount equal to the Partner’s share of the net
decrease in Partner Nonrecourse Debt Minimum Gain attributable to the Partner Nonrecourse Debt, determined in accordance with Treasury Regulations Section 1.704-2(i)(4). Allocations pursuant to the
previous sentence will be made in proportion to the respective amounts required to be allocated to each Partner pursuant thereto. The items to be so allocated will be determined in accordance with Treasury Regulations
Sections 1.704-2(i)(4) and 1.704-2(j)(2). This Section 7.3(b) is intended to comply with the minimum gain chargeback requirement in Treasury Regulations Section 1.704-2(i)(4) and will be interpreted consistently therewith. 

  
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 (c) Qualified Income Offset. In the event that any Partner unexpectedly receives any
adjustments, allocations, or distributions described in Treasury Regulations Sections 1.704-1(b)(2)(ii)(d)(4), 1.704-1(b)(2)(ii)(d)(5) or
1.704-1(b)(2)(ii)(d)(6), items of Partnership income and gain will be allocated to the Partner in an amount and manner sufficient to eliminate, to the extent required by the Treasury Regulations, the Adjusted
Capital Account Deficit of the Partner as quickly as possible; provided that an allocation pursuant to this Section 7.2(c) will be made only if and to the extent that the Partner would have an Adjusted Capital Account Deficit after all
other allocations provided for in this Article 7 have been tentatively made as if this Section 7.3(c) were not in this Agreement. 

(d) Gross Income Allocation. In the event that any Partner has an Adjusted Capital Account Deficit at the end of any Fiscal Year, each
such Partner shall be allocated items of Partnership income and gain in the amount of the deficit as quickly as possible; provided that an allocation pursuant to this Section 7.3(d) will be made only if and to the extent that the Partner
would have an Adjusted Capital Account Deficit after all other allocations provided for in this Article 7 have been tentatively made as if Section 7.3(c) and this Section 7.3(d) were not in this Agreement. 

(e) Nonrecourse Deductions. Nonrecourse Deductions for any Fiscal Year shall be allocated to the Partners in accordance each
Partner’s Percentage Interest. 
 (f) Partner Nonrecourse Deductions. Any Partner Nonrecourse Deductions for any Fiscal Year will
be allocated to the Partner who bears the economic risk of loss with respect to the Partner Nonrecourse Debt to which the Partner Nonrecourse Deductions are attributable in accordance with Treasury Regulations
Section 1.704-2(i)(1). 
 (g) Section 754 Adjustments. To the extent an adjustment
to the adjusted tax basis of any Partnership asset, pursuant to Code Section 734(b) (including pursuant to Treasury Regulations Section 1.734-2(b)(1)) is required, pursuant to Treasury Regulations
Section 1.704-1(b)(2)(iv)(m)(2) or 1.704-1(b)(2)(iv)(m)(4), to be taken into account in determining Capital Accounts as the result of a distribution to a Partner in
complete liquidation of the Partner’s interest in the Partnership, the amount of the adjustment to Capital Accounts will be treated as an item of gain (if the adjustment increases the basis of the asset) or loss (if the adjustment decreases the
basis) and the gain or loss will be allocated to the Partners in proportion to their interests in the Partnership in the event Treasury Regulations Section 1.704-1(b)(2)(iv)(m)(2) applies, or to the
Partner to whom the distribution was made in the event Treasury Regulations Section 1.704-1(b)(2)(iv)(m)(4) applies. 

Section 7.4 Regulatory Allocations. The allocations set forth in Section 7.3 (the “Regulatory
Allocations”) are intended to comply with certain requirements of the Treasury Regulations. It is the intent of the Partners that, to the extent possible, all Regulatory Allocations shall be offset either with other Regulatory
Allocations or with special allocations of other items of Partnership income, gain, loss or deduction pursuant to this Section 7.4. Therefore, notwithstanding any other provision of this Article 7 (other than the Regulatory Allocations), but
subject to the Code and the Treasury Regulations, the General Partner shall make such offsetting special allocations of Partnership income, gain, loss or deduction in whatever manner it determines appropriate so that, after such offsetting
allocations are made, each Partner’s Capital 

  
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Account balance is, to the extent possible, equal to the Capital Account balance such Partner would have had if the Regulatory Allocations were not part of this Agreement. In making such
determination, the General Partner shall take into account future Regulatory Allocations that, although not yet made, are likely to offset other Regulatory Allocations previously made. 

Section 7.5 Income Tax Allocations. 

(a) Except as provided in this Section 7.5, each item of income, gain, loss and deduction of the Partnership for federal income tax
purposes shall be allocated among the Partners in the same manner as such items are allocated for book purposes under Section 7.1, Section 7.2, Section 7.3, Section 7.4, and
Section 10.2(b). 
 (b) In accordance with Code Section 704(c) and the applicable Treasury Regulations thereunder, income,
gain, loss and deduction with respect to any property contributed to the Partnership shall, solely for tax purposes, be allocated among the Partners so as to take account of any variation between the adjusted basis of such property to the
Partnership for federal income tax purposes and its Gross Asset Value at the time of its contribution to the Partnership. If the Gross Asset Value of any Partnership property is adjusted in accordance with clause (b) or (d) of the
definition of Gross Asset Value, then subsequent allocations of income, gain, loss and deduction shall take into account any variation between the adjusted basis of such property for federal income tax purposes and its Gross Asset Value as provided
in Code Section 704(c) and the related Treasury Regulations. For purposes of such allocations, the Partnership shall elect the remedial allocation method described in Treasury Regulation Section 1.704-3(d). 

(c) All items of income, gain, loss, deduction and credit allocated to the Partners in accordance with the provisions hereof and basis
allocations recognized by the Partnership for federal income tax purposes shall be determined without regard to any election under Section 754 of the Code which may be made by the Partnership. 

(d) If any deductions for depreciation or cost recovery are recaptured as ordinary income upon the Transfer of Partnership properties, the
ordinary income character of the gain from such Transfer shall be allocated among the Partners in the same ratio as the deductions giving rise to such ordinary character were allocated. 

Section 7.6 Allocation and Other Rules. 

(a) Profits, Losses, and any other items of income, gain, loss, or deduction will be allocated to the Partners pursuant to this Article
7 as of the last day of each Fiscal Year, provided that Profits, Losses, and the other items will also be allocated at any time the Gross Asset Values of the Partnership’s assets are adjusted pursuant to paragraph (b) of the
definition of “Gross Asset Value”. 
 (b) In the event Partners are admitted to the Partnership pursuant to this Agreement
on different dates, the Profits (or Losses) allocated to the Partners for each Fiscal Year during which Partners are so admitted shall be allocated among the Partners in proportion to their Percentage Interests during such Fiscal Year in accordance
with Section 706 of the Code, using any convention permitted by Law and selected by the General Partner that takes into account the varying interests of the Partners during such Fiscal Year. 

  
 12 

 (c) For purposes of determining the Profits, Losses or any other items allocable to any period,
Profits, Losses and any such other items shall be determined on a daily, monthly or other basis, as determined by the General Partner using any method that is permissible under Section 706 of the Code and the Treasury Regulations thereunder.

 (d) The Partners are aware of the income tax consequences of the allocations made by this Article 7 and hereby agree to be bound by the
provisions of this Article 7 in reporting their shares of Partnership income and loss for tax purposes. 
 ARTICLE VIII 

MANAGEMENT AND OPERATIONS OF BUSINESS 

Section 8.1 General Partner’s Authority; Reimbursement. Except as otherwise expressly provided in this Agreement, all powers
to control and manage the business and affairs of the Partnership shall be vested exclusively in the General Partner; and the Limited Partners shall not have any power to control or manage the Partnership. The General Partner shall be reimbursed on
a basis as the General Partner may determine for (a) all direct and indirect expenses it incurs or payments it makes on behalf of the Partnership (including salary, bonus, incentive compensation and other amounts paid to any Person, including
Affiliates of the General Partner, to perform services for the Partnership or for the General Partner in the discharge of its duties to the Partnership) and (b) all other direct and indirect expenses allocable to the Partnership or otherwise
incurred by the General Partner in connection with operating the Partnership’s business (including expenses allocated to the General Partner by its Affiliates). The General Partner shall determine the expenses that are allocable to the
Partnership. Reimbursements pursuant to this Section 8.1 shall be in addition to any reimbursement to the General Partner as a result of indemnification pursuant to Section 8.3. The General Partner may be removed or replaced
only with the written consent of the General Partner and Limited Partners having at least 95% of the Percentage Interests. 

Section 8.2 Approval Required for Certain Action. In addition to matters set forth in Section 6.1, the General Partner
shall not cause the Partnership to, and the Partnership shall not, take any of the following actions without the approval or consent of the Limited Partners (which consent may be made categorically or by policy): 

(a) effecting any merger or consolidation involving the Partnership; 

(b) effecting any sale or exchange of all or substantially all of Partnership’s assets; 

(c) dissolving or liquidating the Partnership; 

(d) creating or causing to exist any consensual restriction on the ability of the Partnership or its subsidiaries to make distributions, pay
any indebtedness, make loans or advances or transfer assets to its Limited Partners or their subsidiaries; 

  
 13 

 (e) settling or compromising any claim, dispute or litigation directly against, or otherwise
relating to indemnification by the Partnership of, any of the directors or officers of the General Partner; or 
 (f) issuing additional
interests in the Partnership. 
 Section 8.3 Indemnification. 

(a) To the fullest extent permitted by law, all Indemnitees shall be indemnified and held harmless by the Partnership from and against any and
all losses, claims, damages, liabilities, joint or several, expenses (including legal fees and expenses), judgments, fines, penalties, interest, settlements or other amounts arising from any and all threatened, pending or completed claims, demands,
actions, suits or proceedings, whether civil, criminal, administrative or investigative, and whether formal or informal and including appeals, in which any Indemnitee may be involved, or is threatened to be involved, as a party or otherwise, by
reason of its status as an Indemnitee and acting (or refraining to act) in such capacity; provided, that the Indemnitee shall not be indemnified and held harmless if there has been a final and non-appealable judgment entered by a court of
competent jurisdiction determining that, in respect of the matter for which the Indemnitee is seeking indemnification pursuant to this Section 8.3, the Indemnitee acted in Bad Faith or, in the case of a criminal matter, acted with
knowledge that the Indemnitee’s conduct was unlawful. Any indemnification pursuant to this Section 8.3 shall be made only out of the assets of the Partnership, it being agreed that the Partners shall not be personally liable for
such indemnification and shall have no obligation to contribute or loan any monies or property to the Partnership to enable it to effectuate such indemnification. 

(b) To the fullest extent permitted by law, expenses (including legal fees and expenses) incurred by an Indemnitee who is indemnified pursuant
to Section 8.3(a) in appearing at, participating in or defending any claim, demand, action, suit or proceeding shall, from time to time, be advanced by the Partnership prior to a final and non-appealable judgment entered by a court of
competent jurisdiction determining that, in respect of the matter for which the Indemnitee is seeking indemnification pursuant to this Section 8.3, that the Indemnitee is not entitled to be indemnified upon receipt by the Partnership of
any undertaking by or on behalf of the Indemnitee to repay such amount if it shall be ultimately determined that the Indemnitee is not entitled to be indemnified as authorized by this Section 8.3. 

(c) The indemnification provided by this Section 8.3 shall be in addition to any other rights to which an Indemnitee may be
entitled under any agreement, as a matter of law, in equity or otherwise, both as to actions in the Indemnitee’s capacity as an Indemnitee and as to actions in any other capacity, and shall continue as to an Indemnitee who has ceased to serve
in such capacity and shall inure to the benefit of the heirs, successors, assigns and administrators of the Indemnitee. 
 (d) The
Partnership may purchase and maintain (or reimburse any Partner or its Affiliates for the cost of) insurance, on behalf of any Partner, its Affiliates, the Indemnitees and such other Persons as the General Partner shall determine, against any
liability that may be asserted against, or expense that may be incurred by, such Person in connection with the Partnership’s activities or such Person’s activities on behalf of the Partnership, regardless of whether the Partnership would
have the power to indemnify such Person against such liability under the provisions of this Agreement. 

  
 14 

 (e) For purposes of this Section 8.3, the Partnership shall be deemed to have
requested an Indemnitee to serve as fiduciary of an employee benefit plan whenever the performance by it of its duties to the Partnership also imposes duties on, or otherwise involves services by, it to the plan or participants or beneficiaries of
the plan; excise taxes assessed on an Indemnitee with respect to an employee benefit plan pursuant to applicable law shall constitute “fines” within the meaning of Section 8.3(a); and action taken or omitted by it with respect
to any employee benefit plan in the performance of its duties for a purpose reasonably believed by it to be in the best interest of the participants and beneficiaries of the plan shall be deemed to be for a purpose that is in the best interests of
the Partnership. 
 (f) In no event may an Indemnitee subject any of the Partners to personal liability by reason of the indemnification
provisions set forth in this Agreement. 
 (g) An Indemnitee shall not be denied indemnification in whole or in part under this
Section 8.3 because the Indemnitee had an interest in the transaction with respect to which the indemnification applies if the transaction was otherwise permitted by the terms of this Agreement. 

(h) The provisions of this Section 8.3 are for the benefit of the Indemnitees and their heirs, successors, assigns, executors and
administrators and shall not be deemed to create any rights for the benefit of any other Persons. 
 (i) No amendment, modification or repeal
of this Section 8.3 or any provision hereof shall in any manner terminate, reduce or impair the right of any past, present or future Indemnitee to be indemnified by the Partnership, nor the obligations of the Partnership to indemnify any
such Indemnitee under and in accordance with the provisions of this Section 8.3 as in effect immediately prior to such amendment, modification or repeal with respect to claims arising from or relating to matters occurring, in whole or in
part, prior to such amendment, modification or repeal, regardless of when such claims may arise or be asserted. 
 Section 8.4
Limitation of Liability of Indemnitees. 
 (a) Notwithstanding anything to the contrary set forth in this Agreement or under the Act
or any other law, rule or regulation at equity, no Indemnitee shall be liable for monetary damages or otherwise to the Partnership, to another Partner, to any other Person who acquires an interest in the Partnership or to any other Person bound by
this Agreement, for losses sustained or liabilities incurred, of any kind or character, as a result of its or any other Indemnitee’s determinations, act(s) or omission(s) in their capacities as Indemnitees; provided however, that an Indemnitee
shall be liable for losses or liabilities sustained or incurred by the Partnership, any Partners, any other Persons who acquire an interest in the Partnership or any other Person bound by this Agreement, if it is determined by a final non-appealable
judgment entered by a court of competent jurisdiction that such losses or liabilities were the result of the conduct engaged by such Indemnitee being in in Bad Faith or with respect to any criminal conduct, with the knowledge that such
Indemnitee’s conduct was unlawful. 

  
 15 

 (b) To the extent that, at law or in equity, an Indemnitee has duties (including fiduciary
duties) and liabilities relating thereto to the Partnership, any Partners, any other Persons who acquire an interest in the Partnership or any other Person bound by this Agreement, the General Partner and any other Indemnitee acting in connection
with the Partnership’s business or affairs shall not be liable to the Partnership, to any Partner, to any person who acquires an interest in the Partnership or to any other Person bound by this Agreement for its reliance on the provisions of
this Agreement. 
 (c) Any amendment, modification or repeal of this Section 8.4 or any provision hereof shall be prospective
only and shall not in any way affect the limitations on the liability of the Indemnitees under this Section 8.4 as in effect immediately prior to such amendment, modification or repeal with respect to claims arising from or relating to
matters occurring, in whole or in part, prior to such amendment, modification or repeal, regardless of when such claims may arise or be asserted. 

Section 8.5 Loans or Contributions from the Partnership. The Partnership may lend or contribute to any Affiliate or Limited
Partner, and any Affiliate or Limited Partner may borrow from the Partnership, funds on terms and conditions determined by the General Partner. 

ARTICLE IX 
 RIGHTS
AND OBLIGATIONS OF LIMITED PARTNERS 
 The Limited Partners shall have no liability under this Agreement except as otherwise provided by
Law. 
 ARTICLE X 

TAX MATTERS 

Section 10.1 Tax Matters Partner. The “tax matters partner” of the Partnership for purposes of Section 6231(a)(7)
of the Code shall be the General Partner, and shall have the power to manage and control, on behalf of the Partnership, any administrative proceeding at the Partnership level with the Internal Revenue Service relating to the determination of any
item of Partnership income, gain, loss, deduction or credit for federal income tax purposes. 
 Section 10.2 Section 754
Election. The tax matters partner shall make, on behalf of the Partnership, an election in accordance with Section 754 of the Code, so as to adjust the basis of Partnership property in the case of a distribution of property within the
meaning of Section 734 of the Code, and in the case of a transfer of interests within the meaning of Section 743 of the Code. 

ARTICLE XI 

DISSOLUTION AND LIQUIDATION 

Section 11.1 Events Causing Dissolution. The Partnership shall be dissolved, and its affairs shall be wound up, upon the
expiration of its term as provided in Section 2.4. Upon the dissolution of the Partnership, the General Partner shall promptly notify the Partners of such dissolution. 

  
 16 

 Section 11.2 Liquidation. 

(a) Upon dissolution of the Partnership, the General Partner shall carry out the winding up of the Partnership and shall immediately commence
to wind up the Partnership’s affairs; provided, a reasonable time shall be allowed for the orderly liquidation of the assets of the Partnership and the satisfaction of liabilities to creditors so as to enable the Partners to minimize the normal
losses attendant upon a liquidation. The proceeds of liquidation shall be applied first to payment of all expenses and debts of the Partnership and setting up of such reserves as the General Partner reasonably deems necessary to wind up the
Partnership’s affairs and to provide for any contingent liabilities or obligations of the Partnership; provided, the unpaid principal of and interest on any loans made to the Partnership by Partners (and their Affiliates) shall be distributed
pro rata to the Partners (and their Affiliates) who made such loans, in proportion to the total amount of principal and interest payable on such loans, such distributions being treated first as a payment of accrued interest on such loans and next as
a payment of principal on such loans. Any remaining proceeds shall be distributed to the Partners in accordance with their positive Capital Account balances after giving effect to all contributions, distributions and allocations for all periods.

 (b) In the event of any liquidation and winding up of the Partnership under this Section 10.2 or a sale, exchange or other
disposition of all or substantially all of the assets of the Partnership, either voluntary or involuntary, Profits and Losses and each item of gross income, gain, loss and deduction for such period shall be allocated to the Partners so that, to the
maximum extent possible, the Partners’ Capital Account balances are in proportion to their Percentage Interests, and no other allocation of Profit or Loss pursuant to this Agreement shall reverse the effect of such allocation. If in the year of
such liquidation, dissolution or winding up, the Partners’ Capital Accounts are not in proportion to their Percentage Interests after the application of the preceding sentence, then to the extent permitted by Law and notwithstanding anything to
the contrary contained in this Agreement, items of gross income and gain for any preceding taxable period(s) with respect to which IRS Form 1065 Schedules K-1 have not been filed by the Partnership shall be reallocated among the Partners
until the Partners’ Capital Accounts are in proportion to their Percentage Interests, and no other allocation of Profit or Loss pursuant to this Agreement shall reverse the effect of such allocation. 

Section 11.3 Termination. The Partnership shall terminate when all of the assets of the Partnership, after payment of or due
provision for all debts, liabilities and obligations of the Partnership, shall have been distributed to the Partners in the manner provided for in this Article 11 and the Certificate shall have been canceled, or such other documents required under
the Act to be executed and filed with the Secretary of State of the State of Delaware have been so executed and filed, in the manner required by the Act. 

Section 11.4 Claims of the Partners or Third Parties. The Partners and former Partners shall look first to the Partnership’s
assets for the return of their Capital Contributions, and if the assets of the Partnership remaining after payment of or due provision for all debts, liabilities and obligations of the Partnership are insufficient to return such Capital
Contributions, the Partners 

  
 17 

 
shall look to the General Partner for a return of their Capital Contributions; provided, nothing contained herein shall be deemed to limit the rights of a Partner under applicable Law. In the
event any Partner other than the General Partner has a deficit balance in its Capital Account at the time of the Partnership’s dissolution, it shall not be required to restore such account to a positive balance or otherwise make any payments to
the Partnership or its creditors or other third parties in respect of such deficiency. 
 Section 11.5 Distributions In-Kind. If
any assets of the Partnership shall be distributed in kind, such assets shall be distributed to the Partner(s) entitled thereto as tenants-in-common in the same proportions as such Partner(s) would have been entitled to cash distributions if
(i) such assets had been sold for cash by the Partnership at the fair market value of such property (taking the Gross Asset Value definition herein and Code Section 7701(g) into account) on the date of distribution; (ii) any
unrealized income, gain, loss and deduction inherent in such property (that has not been reflected in the Capital Accounts previously) that would be realized by the Partnership from such sale were allocated among the Partner(s) as Profits or Losses
in accordance with this Agreement; and (iii) the cash proceeds were distributed to the Partner(s) in accordance with this Article 11. The Capital Accounts of the Partner(s) shall be increased by the amount of any unrealized income or gain
inherent in such property or decreased by the amount of any loss or deduction inherent in such property that would be allocable to them, and shall be reduced by the fair market value of the assets distributed to them under the preceding sentence.
Notwithstanding the foregoing, the Partners shall have the right to assign their interest to such in-kind distribution to any Person. 

ARTICLE XII 

AMENDMENT OF PARTNERSHIP AGREEMENT 

Subject to Section 8.3, the General Partner may amend any provision of this Agreement with the consent of the Limited Partners having at
least 75% of the Percentage Interests, and may execute, swear to, acknowledge, deliver, file and record whatever documents may be required in connection therewith. 

ARTICLE XIII 

GENERAL PROVISIONS 

Section 13.1 Addresses and Notices. Any notice to the Partnership shall be deemed given if received by it in writing at the
principal office of the Partnership designated pursuant to Section 2.3(a). Any notice to the General Partner or a Limited Partner shall be deemed given if received by it in writing at the address designated in Schedule I, or
such other place as the General Partner or Limited Partner may from time to time designate. 
 Section 13.2 Binding Effect. This
Agreement shall be binding upon and inure to the benefit of the parties hereto and their successors and assigns. 
 Section 13.3
Integration. This Agreement constitutes the entire agreement among the parties pertaining to the subject matter hereof and supersedes all prior agreements and understandings pertaining thereto. 

  
 18 

 Section 13.4 Severability. If any provision of this Agreement is or becomes invalid,
illegal or unenforceable in any respect, the validity, legality and enforceability of the remaining provisions hereof, or of such provision in other respects, shall not be affected thereby. 

Section 13.5 Applicable Law. This Agreement shall be governed by and construed and enforced in accordance with the laws of the
State of Delaware. 
 Section 13.6 No Third Party Beneficiary. This Agreement is made solely and specifically for the benefit of
the Partners and their successors and assigns and no other Persons shall have any rights, interest or claims hereunder or be entitled to any benefits under or on account of this Agreement as a third party beneficiary or otherwise. None of the
provisions of this Agreement shall be for the benefit of, or shall be enforceable by, any creditor of the Partnership. 
 [Remainder of Page
Intentionally Left Blank] 

  
 19 

 WHEREFORE, this Amended and Restated Agreement of Limited Partnership has been duly
executed by the General Partner and the Limited Partners as of the date first above written. 
  

			
	GENERAL PARTNER:
	
	WESTLAKE CHEMICAL OPCO GP LLC
		
	By:	 	 
	Name:	 	
	Title:	 	
	
	LIMITED PARTNERS:
	
	WPT LLC
	By:	 	Westlake Chemical Investments, Inc., its Manager
		
	By:	 	 
	Name:	 	
	Title:	 	
	
	WESTLAKE PETROCHEMICALS LLC
	By:	 	Westlake Chemical Investments, Inc., its Manager
		
	By:	 	 
	Name:	 	
	Title:	 	

 SIGNATURE PAGE TO 

AMENDED AND RESTATED AGREEMENT OF LIMITED
PARTNERSHIP 

 
			
	WESTLAKE LONGVIEW CORPORATION
		
	By:	 	 
	Name:	 	
	Title:	 	
	
	WESTLAKE VINYLS, INC.
		
	By:	 	 
	Name:	 	
	Title:	 	
	
	WESTLAKE CHEMICAL PARTNERS LP
	By:	 	Westlake Chemical Partners GP LLC, its general partner
		
	By:	 	 
	Name:	 	
	Title:	 	

 SIGNATURE PAGE TO 

AMENDED AND RESTATED AGREEMENT OF LIMITED
PARTNERSHIP 

 SCHEDULE I 

 

			
	 Limited Partner Name and Address
	  	 Percentage Interest

	 WPT LLC
 2801 Post Oak Boulevard, Suite
600
 Houston, Texas 77056
	  	
		
	 Westlake Petrochemicals LLC
 2801 Post
Oak Boulevard, Suite 600
 Houston, Texas 77056
	  	
		
	 Westlake Longview Corporation
 2801 Post
Oak Boulevard, Suite 600
 Houston, Texas 77056
	  	
		
	 Westlake Vinyls, Inc.
 2801 Post Oak
Boulevard, Suite 600
 Houston, Texas 77056
	  	
		
	 Westlake Chemical Partners LP
 2801
Post Oak Boulevard, Suite 600
 Houston, Texas 77056
	  	
		
	General Partner Name and Address	  	
	 Westlake Chemical OpCo GP LLC
 2801
Post Oak Boulevard, Suite 600
 Houston, Texas 77056EX-10.10

 Exhibit 10.10 

UNSECURED PROMISSORY NOTE 

August 1, 2013 
 FOR VALUE
RECEIVED, the undersigned, WPT LLC, a Delaware limited liability company (together with its successors and permitted assigns, the “Borrower”), hereby promises to pay Westlake Development Corporation, a Delaware corporation
(together with its successors and assigns, the “Lender”, the Lender and the Borrower each referred to individually as a “Party” and, collectively, as the “Parties”), in lawful
money of the United States of America in immediately available funds (or such netting arrangements or other payment arrangements as the Parties may agree from time to time), the aggregate outstanding principal amount of all advances made by the
Lender to the Borrower from time to time on or after the date hereof and prior to the Maturity Date (as defined below) as reflected in General Ledger Account a203027 (“Advances”), together with all accrued and unpaid interest
thereon, on August 1, 2023 (the “Maturity Date”). Advances under this Note may be made from time to time at the sole and absolute discretion of the Lender. Notations made to the General Ledger Account a203027 shall be
deemed conclusive evidence of each Advance, absent manifest error. Once repaid or prepaid, Advances may not be reborrowed. 
 SECTION 1.
PAYMENTS 
 (a) The principal amount of this Note outstanding from time to time shall bear interest at a rate per annum equal to the
Prime Rate as in effect from time to time plus the Applicable Margin. The interest rate accruing on the outstanding principal amount of this Note shall increase by 2.00% per annum: (i) automatically following either
(A) the occurrence of the Maturity Date (in the event that this Note is not repaid in full on or prior thereto) or (B) the occurrence and during the continuance of an Event of Default of the type described in clauses (ii) through
(iv) of the definition thereof; and (ii) at the election of the Lender upon the occurrence and during the continuance of any Event of Default other than those described in clauses (ii) through (iv) of the definition thereof. 

(b) Interest on this Note will be payable in arrears on each Interest Payment Date for the Interest Period most recently ended. On each
Interest Payment Date, the Borrower may, with respect to all or a portion of the outstanding principal amount of this Note, pay the interest accrued thereon by adding such amount to the principal amount of this Note (a “PIK
Payment”), with the interest accrued on the remainder (if any) of the outstanding principal amount of this Note to be paid fully in cash (or such netting arrangements or other payment arrangements as the Parties may agree from time to
time) (a “Cash Payment”). A PIK Payment shall be deemed to be made with respect to the portion (if any) of the outstanding principal amount of this Note for which a Cash Payment is not received by the Lender on the applicable
Interest Payment Date. 
 (c) For all purposes hereof, references to “principal amount” of this Note includes any increase in the
principal amount of this Note as a result of a PIK Payment. 
 (d) The Borrower shall have the right at any time and from time to time to
prepay this Note, in whole or in part, without any premium or penalty, at the unpaid principal amount thereof so to be prepaid, together with unpaid interest accrued thereon to the date fixed for such prepayment. 

 (e) Notwithstanding anything herein to the contrary: (i) accrued but unpaid interest on this
Note shall be payable in arrears in full in cash (or such netting arrangements or other payment arrangements as the Parties may agree from time to time) on the Maturity Date; (ii) additional interest accrued pursuant to paragraph (a) of
this Section 1 shall be payable on demand; and (iii) in the event of any repayment or prepayment of this Note, accrued interest on the principal amount repaid or prepaid shall be payable on the date of such repayment or prepayment. All
interest hereunder shall be computed on the basis of a year of 360 days and shall be payable for the actual number of days elapsed (including the first day but excluding the last day). 

(f) All payments on this Note (other than PIK Payments) will be made to the Lender in lawful money of the United States of America by wire
transfer of immediately available funds (or such netting arrangements or other payment arrangements as the Parties may agree from time to time) to such account as may be hereafter designated by the Lender by notice to the Borrower. If the payment of
any amount to be made on this Note shall become due and payable on a day other than a Business Day, such payment shall be made on the next succeeding Business Day, and interest shall continue to accrue at the required rate hereunder until any such
payment is made. 
 (g) The Borrower and the Lender agree that this Note shall be (and they expect this Note to be) treated as debt for tax
purposes, and neither the Borrower nor the Lender shall take a position contrary to this position on any tax return or through any other action, unless required by a final judgment of a court of competent jurisdiction (as reasonably determined by
the Borrower and the Lender in good faith). 
 SECTION 2. REMEDIES 

(a) Upon the occurrence and during the continuance of (x) any Event of Default described in clauses (ii), (iii) or (iv) of the
definition thereof, without action on the part of the Lender or any notice or demand, the entire principal amount of this Note, together with accrued and unpaid interest thereon, if any, and all other amounts accrued or outstanding under this Note
shall be immediately due and payable or (y) any other Event of Default, the Lender may, at its option and by written notice to the Borrower, declare the entire principal amount of this Note, together with accrued and unpaid interest thereon, if
any, and all other amounts accrued or outstanding under this Note to be immediately due and payable. In all cases, the Lender may enforce any other right and remedies created pursuant to this Note or available at law or in equity. 

(b) The Lender may rescind such declaration and its consequences if the rescission would not conflict with any judgment or decree. 

SECTION 3. EFFECTIVENESS. 

This Note shall become effective upon the execution and delivery by the Borrower of this Note to the Lender. 

  
 2 

 SECTION 4. REPRESENTATIONS AND WARRANTIES. 

To induce the Lender to make the Advances evidenced by this Note, the Borrower represents and warrants that the following statements are true
and correct as of the date of this Note and the date of each Advance: 
 (a) Organization and Qualification. The Borrower is duly
organized, validly existing and in good standing under the laws of the State of Delaware. 
 (b) Power and Authority. The Borrower is
duly authorized and empowered to enter into, execute, deliver and perform this Note. This Note has been duly and validly executed and delivered by the Borrower. The execution, delivery and performance by the Borrower of this Note have been duly
authorized by all necessary action on the part of Borrower. 
 (c) Legally Enforceable. This Note: (i) is a legal, valid and
binding obligation of the Borrower, enforceable against the Borrower in accordance with its terms except as may be limited by bankruptcy, insolvency and other similar laws affecting creditors’ rights generally and by general equitable
principles; (ii) does not and will not contravene or violate any Legal Requirement or the Borrower’s organizational documents; and (iii) does not and will not result in the breach of, or constitute a default under, any agreement or
instrument by which the Borrower or any of its Property may be bound or affected. 
 SECTION 5. COVENANTS. So long as any Advances,
interest thereon, or any other obligations remain unpaid under this Note: 
 (a) Payment of Obligations. The Borrower shall pay the
indebtedness evidenced by this Note according to the terms hereof, and shall timely pay or perform, as the case may be, all of the other obligations of the Borrower to the Lender, direct or contingent, however evidenced or denominated, and however
and whenever incurred, together with interest thereon, and any extensions, modifications, consolidations and/or renewals thereof. 
 (b)
Taxes, Existence, Regulations, Property, etc. At all times, the Borrower shall (a) file all required tax returns and appropriate schedules thereto and pay when due all taxes, assessments and governmental charges or levies of every kind
and nature upon it or against its income, profits or Property before the date on which penalties attach thereto, unless and only to the extent that the same shall be contested in good faith and reserves in accordance with GAAP have been established
therefor; and (b) do all things necessary to preserve its existence, good standing, qualifications, rights and franchises in all jurisdictions where such qualification is necessary or desirable, except to the extent that failure to do so could
not reasonably be expected to have a Material Adverse Effect. 
 (c) Maintenance of Properties. The Borrower shall:
(i) maintain, preserve and protect all of its Property necessary in the operation of its business in good working order and condition, ordinary wear and tear excepted; and (ii) make all necessary repairs thereto and renewals and
replacements thereof, except where the failure to do so could not reasonably be expected to have a Material Adverse Effect. 

  
 3 

 (d) Compliance with Laws. The Borrower will comply in all material respects with all Legal
Requirements (including environmental laws) applicable to it or to its business or Property, except in any such instances in which (i) any such Legal Requirement is being contested in good faith by appropriate proceedings diligently conducted,
or (ii) the failure to comply therewith could not reasonably be expected to have a Material Adverse Effect. 
 (e) Notice of
Default. The Borrower shall give written notice to the Lender of the occurrence of any Default or Event of Default as soon as reasonably practicable after obtaining knowledge of the occurrence thereof. 

SECTION 6. DEFINITIONS 

For purposes of this Note, the following terms shall have the following meanings: 

“Advance” has the meaning ascribed to such term in the preamble to this Note. 

“Affiliate” of any entity means any other entity directly or indirectly controlling or controlled by or under direct
or indirect common control with such entity. For purposes of this definition “control” (including, with correlative meanings, the terms “controlling,” “controlled by” and “under common control with”), as used
with respect to any entity, shall mean the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of such entity, whether through ownership of voting securities, by agreement or otherwise.

 “Applicable Margin” means 150 basis points. 

“Borrower” has the meaning ascribed to such term in the preamble to this Note. 

“Business Day” means any day other than Saturday, Sunday or a day on which banks located in New York, New York or
Houston, Texas are authorized or obligated to close. 
 “Cash Payment” has the meaning ascribed to such term in
Section 1(b) of this Note. 
 “Default” means any event or circumstance that with the passage of
time or the giving of notice (or both) would constitute an Event of Default hereunder. 
 “Event of Default” means
any of the following events: 
 (i) the Borrower fails to pay any principal, interest or other amounts payable under this
Note; or 
 (ii) the Borrower or any of its subsidiaries pursuant to or within the meaning of Title 11 of the United States
Code or any similar federal or state law for the relief of debtors (each, a “Bankruptcy Law”) (A) commences a voluntary case in bankruptcy or any other action or proceeding for any other similar relief under any
Bankruptcy Law, (B) consents by answer or otherwise to the commencement against it of an involuntary case of bankruptcy, (C) seeks or consents to the appointment of a receiver, trustee, assignee, liquidator, custodian or similar official
(collectively, a “Custodian”) of 

  
 4 

 
it or for all or substantially all of its assets, (D) makes a general assignment for the benefit of its creditors, or (E) generally is unable to pay its debts as its debts become due;
or 
 (iii) a court of competent jurisdiction enters an order or decree under any Bankruptcy Law that (A) is for relief
against the Borrower or any of its subsidiaries in an involuntary case of bankruptcy against the Borrower or any of its subsidiaries, (B) appoints a Custodian of the Borrower or any of its subsidiaries for all or substantially all of its
assets, or (C) orders the liquidation of the Borrower or any of its subsidiaries, and the order remains unstayed and in effect for 60 days, or any dismissal, stay rescission or termination thereof ceases to remain in effect; or 

(iv) any involuntary proceeding under any Bankruptcy Law or any involuntary proceeding seeking the appointment of a Custodian
for the Borrower or any of its subsidiaries or a substantial part of its or any of its subsidiaries’ Property shall remain unstayed and undismissed for a period of 60 days; or 

(v) any representation or warranty made or deemed made by the Borrower herein shall prove to be incorrect in any material
respect; or 
 (vi) the Borrower fails to comply with any provision of this Note and fails to cure such failure within 30
days after notice thereof from the Lender. 
 “Governmental Authority” means any nation or government, any state or
other political subdivision thereof, and any entity exercising executive, legislative, judicial, regulatory or administrative authority or functions of or pertaining to government. 

“Interest Payment Date” means the first Business Day of each January, April, July and 

October. 
 “Interest
Period” means each period commencing on an Interest Payment Date and ending on the date preceding the next Interest Payment Date; provided that the first Interest Period shall begin on the date hereof. 

“Legal Requirement” means any law, statute, ordinance, decree, requirement, order, judgment, rule, regulation (or
interpretation of any of the foregoing) of, and the terms of any license or permit issued by, any Governmental Authority. 

“Lender” has the meaning ascribed to such term in the preamble to this Note. 

“Material Adverse Effect” means a material adverse effect on any of the following: (a) the business, condition
(financial or otherwise), operations, performance or properties of the Borrower; (b) the ability of Borrower to perform its obligations hereunder; or (c) the ability of the Lender to enforce its rights and remedies hereunder. 

“Note” means this Unsecured Promissory Note. 

“Parties” has the meaning ascribed to such term in the preamble to this Note. 

  
 5 

 “Person” means an individual, a partnership, a corporation, a limited
liability company, an association, a joint stock company, a trust, a joint venture, an unincorporated organization and a governmental entity or any department, agency or political subdivision thereof. 

“PIK Payment” has the meaning ascribed to such term in Section 1(b) of this Note. 

“Prime Rate” means the “WSJ Prime Rate” as reported by The Wall Street Journal from time to time or such
other “prime rate” as published by a reputable source as the Lender may select, provided that each change in the Prime Rate shall be effective from and including the date such change is publicly announced as being effective. 

“Property” means any interest in any kind of property or asset, whether real, personal or mixed, tangible or
intangible. 
 SECTION 7. MISCELLANEOUS 

(a) Any amendment or waiver of any provision hereof may be made with the written consent of the Borrower and the Lender. 

(b) The Parties may not transfer or assign any of their respective rights or obligations under this Note without the consent of the
non-assigning Party (such consent not to be unreasonably withheld, conditioned or delayed); provided that the Lender may transfer and assign this Note to any of its Affiliates without the consent of the Borrower. 

(c) All notices and other communications required or permitted hereunder shall be in writing and shall be deemed to have been duly given if
and when delivered to the addresses as the Parties may from time to time provide to each other. 
 (d) The non-exercise by the Lender of any
of its rights hereunder in any particular instance shall not constitute a waiver thereof in that or any subsequent instance. 
 (e) If, at
any time, any provision of this Note is or becomes illegal, invalid or unenforceable in any respect under any law of any jurisdiction, neither the legality, validity or enforceability of the remaining provisions, nor the legality, validity or
enforceability of such provision under the law of any other jurisdiction, will in any way be affected or impaired. 
 (f) The Borrower
hereby waives diligence, presentment, demand, protest and notice of any kind that might be required by law, and consents to any and all renewals or extensions that might be made by the Lender as to the time of payment of this Note from time to time.

 (g) The Lender shall be entitled to recover any and all sums and expenses, including costs, attorneys’ fees and other professional
fees and collection and receiver’s expenses, advanced or incurred by the Lender in connection with the enforcement or collection of this Note. The Borrower shall reimburse the Lender for such sums and expenses from time to time upon demand.

  
 6 

 (h) THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF
NEW YORK. 
 (i) All judicial proceedings brought against any Party, arising out of or relating hereto, or any of such Party’s
obligations hereunder, may be brought in any state or Federal court of competent jurisdiction in the State, County and City of New York. Each Party, for itself and in connection with its properties, irrevocably: (a) accepts generally and
unconditionally the nonexclusive jurisdiction and venue of such courts; (b) waives any defense of forum non conveniens; (c) agrees that service of all process in any such proceeding in any such court may be made by registered or
certified mail, return receipt requested, at its address provided in Section 7(c) of this Note; (d) agrees that service as provided in clause (c) above is sufficient to confer personal jurisdiction over such Party in any
such proceeding in any such court, and otherwise constitutes effective and binding service in every respect; and (e) agrees that each Party retains the right to serve process in any other manner permitted by law or to bring proceedings against
the other party in the courts of any other jurisdiction. 
 (j) EACH PARTY HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN
ANY LEGAL ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO THIS NOTE OR THE TRANSACTIONS CONTEMPLATED HEREBY AND AGREES THAT ANY SUCH ACTION OR PROCEEDING SHALL BE TRIED BEFORE A COURT AND NOT BEFORE A JURY. 

[The remainder of this page has intentionally been left blank.] 

  
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 IN WITNESS WHEREOF, the undersigned has executed this Note as of the date first above written.

  

			
	WPT LLC
	By:	 	Westlake chemicals Investments, Inc., its Manager
		
	By:	 	 M. Steven Bender

	Name:	 	M. Steven Bender
	Title:	 	Senior Vice President, Chief Financial Officer Treasurer

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