Document:

Joinder To Credit Agreement

 Exhibit 4.3 
 Execution Copy 
 JOINDER TO CREDIT AGREEMENT 

 THIS JOINDER TO CREDIT AGREEMENT (this “Agreement”), dated as of March 28, 2008, is by
and among TEXAS PETROCHEMICALS LP, a Texas limited partnership (“Company”), TEXAS BUTYLENE CHEMICAL CORPORATION, a Texas corporation (“Texas Butylene” and together with the Company, the
“Borrowers”), the financial institutions signatory hereto in their capacity as Additional Commitment Lenders under and as defined in the Credit Agreement (as defined below), and DEUTSCHE BANK TRUST COMPANY AMERICAS, as
administrative agent for the Lenders under and as defined in the Credit Agreement (“Administrative Agent”), with Deutsche Bank Securities Inc., as Lead Arranger for the Revolver Increase referenced herein. 
 BACKGROUND 
 A. Borrowers, the Lenders, Administrative Agent and LaSalle Bank National Association, as Collateral Agent, are parties to that certain Revolving Credit Agreement dated as of June 27, 2006 (as
amended, restated, supplemented or otherwise modified and in effect from time to time, the “Credit Agreement”). 
 B. Borrowers desire to increase the Total Commitments by $25,000,000 pursuant to Section 2.10 of the Credit Agreement (the “Revolver Increase”). 
 AGREEMENT 
 NOW, THEREFORE, in consideration of the premises and of the mutual covenants contained herein, and other good and valuable consideration the receipt and adequacy of which are hereby acknowledged, the
parties hereto hereby agree as follows: 
 SECTION 1. DEFINED TERMS. Unless otherwise defined herein, all
capitalized terms used herein shall have the meanings given to them in the Credit Agreement. 
 SECTION 2.
JOINDER AND COMMITMENT INCREASE. 
 (a) Certain Lenders (each, an “Increasing Lender”)
agree to increase their respective Commitments on the Revolver Increase Amendment Effective Date (as defined below). Certain financial institutions that were not previously Lenders but that are signatory hereto (each, an “Additional
Lender”) agree to join the Credit Agreement as a “Lender” and to be bound by the terms and conditions of the Credit Agreement. Pursuant to Section 2.10 of the Credit Agreement, the amount set forth opposite each
Lender’s name in the column headed “Commitment” on Annex I of the Credit Agreement is deemed amended and replaced with the amount set forth opposite such Lender’s name in the column headed “Commitment” on the
Annex I attached hereto, and a new row is added to the table in Annex I for each Additional Lender to read as set forth for each such Additional Lender on Annex I attached hereto, which annex reflects the new Commitments after
giving effect to this clause. 
 (b) On the Revolver Increase Effective Date, the Borrowers shall be deemed to
have prepaid and reborrowed all outstanding Loans as of such date (with such borrowings to consist of Loans of the Types and with the Interest Periods (if applicable) specified in a notice

 
delivered by the relevant Borrower(s) in accordance with the provisions of Section 2.2 of the Credit Agreement. The relevant Borrowers (or Company on behalf of such Borrowers) shall
pay to the relevant Lenders the amounts, if any, payable under Section 4.11 of the Credit Agreement as a result of such prepayment. 
 (c) On the Revolver Increase Effective Date, each Additional Commitment Lender shall make available to Administrative Agent such amounts in immediately available funds as Administrative Agent shall
determine, for the benefit of the Lenders that are not Additional Commitment Lenders, are necessary in order to cause each Lender to hold its Proportionate Share (after giving effect to the Revolver Increase and the application of such amounts to
make payments to such Lenders) of the Loans and the participations in the Letters of Credit and Interim Advances. 
 SECTION 3. REPRESENTATIONS AND WARRANTIES. 
 (a) Each Borrower represents and warrants that
(i) it has full corporate (or equivalent) power and authority to enter into this Agreement and perform its obligations hereunder in accordance with the provisions hereof, (ii) this Agreement has been duly authorized, executed and delivered
by such Borrower and (iii) this Agreement constitutes the legal, valid and binding obligation of such Borrower, enforceable against such Borrower in accordance with its terms, except to the extent that such enforceability may be limited by
applicable bankruptcy, insolvency, reorganization, moratorium or similar laws generally affecting creditors’ rights and by equitable principles (regardless of whether enforcement is sought in equity or law). 
 (b) Each Borrower represents and warrants that (i) the representations and warranties contained in the Credit Agreement
and each of the other Loan Documents are each true and correct in all material respects on and as of the Revolver Increase Effective Date to the same extent as though made on and as of that date, except to the extent such representations and
warranties expressly relate to an earlier date, in which case they were true and correct in all material respects on and as of such earlier date, and (ii) no Event of Default or Unmatured Event of Default has occurred and is continuing.

 SECTION 4. CONDITIONS TO EFFECTIVENESS. This Agreement and Revolver Increase shall become effective on
the first Business Day (the “Revolver Increase Effective Date”) each of the following conditions precedent is satisfied: 
 (a) Execution and Delivery of Agreement. Administrative Agent (or its counsel) shall have received from (A) each Increasing Lender and each Additional Lender and (B) Borrowers either
(i) a counterpart of this Agreement signed on behalf of such party or (ii) written evidence satisfactory to Administrative Agent (which may include telecopy transmission of a signed signature page of this Amendment) that such party has
signed a counterpart of this Agreement. 
 (b) Execution and Delivery of Officer’s Certificate.
Administrative Agent shall have received a certificate of a Responsible Officer of Borrowers certifying that the representations and warranties set forth in Section 3 of the Agreement are true and correct in all

  

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material respects as of the Revolver Increase Effective Date except to the extent such representations and warranties are expressly made as of a specified date in which event such representations
and warranties were true and correct in all material respects as of such specified date; no Event of Default or Unmatured Event of Default has occurred and is continuing after giving effect to the Agreement; and the conditions of
Section 4 of the Agreement have been fully satisfied. 
 (c) Reaffirmation Agreement.
Administrative Agent shall have received a duly executed copy of a Reaffirmation of Security Documents executed by each Credit Party other than Borrowers in form and substance reasonably acceptable to Administrative Agent. 
 (d) Notes. Borrowers shall have duly executed and delivered to Administrative Agent, if requested, the Notes
payable to the order of each applicable Lender listed on Schedule 1.1 hereto in the amount of their respective Commitments after giving effect to this Amendment, all of which shall be in full force and effect. 
 (e) Opinion of Counsel. Administrative Agent shall have received from Bracewell & Giuliani LLP, special
counsel to the Credit Parties, an opinion addressed to Administrative Agent and each of the Lenders and dated the Revolver Increase Effective Date, which shall be in form and substance reasonably satisfactory to Administrative Agent; 
 (f) Secretary’s Certificates. Administrative Agent shall have received from each Borrower a certificate, dated
the Revolver Increase Effective Date, signed by the secretary or any assistant secretary of such Borrower, as to the incumbency and signature of the officers of each such Borrower executing this Agreement or any Note (in form and substance
reasonably satisfactory to Administrative Agent) and any certificate or other document or instrument to be delivered pursuant hereto or thereto by or on behalf of such Borrower, together with evidence of the incumbency of such secretary or assistant
secretary, and certifying as true and correct, attached copies of all Organizational Documents of such Borrower and the resolutions of such Borrower referred to in such certificate and all of the foregoing (including each Organizational Document)
shall be reasonably satisfactory to Administrative Agent. 
 (g) Good Standing. Administrative Agent
shall have received a good standing certificate or certificate of status or comparable certificate of each Borrower from the Secretary of State (or other governmental authority) of its state or province of organization. 
 (h) Notice of Borrowing and Letter of Direction; Funds Flow Memorandum. Administrative Agent shall have received a
Notice of Borrowing meeting the requirements of Section 2.2(a)(i) and an executed letter of direction and funds flow memorandum in form and substance reasonably acceptable to Administrative Agent. 
 (i) Litigation. No action, suit or proceeding (including, without limitation, any inquiry or investigation) shall be
pending or threatened against Company or any of its Subsidiaries with respect to the financing contemplated by the Credit Agreement or any documentation executed in connection therewith, unless such action suit or proceeding could not reasonably be
expected to result in a Material Adverse Effect on Company and its Subsidiaries, taken as a whole, and no injunction or other restraining order shall have been issued or a hearing therefor be pending or noticed with respect to this Agreement or the
transactions contemplated hereby or thereby. 
  

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 (j) Approvals. All necessary governmental and material third party
approvals and/or consents in connection with the transactions contemplated by this Agreement shall have been obtained and remain in effect. The execution of the Agreement and the consummation of the transactions contemplated hereby shall not violate
or conflict with any law, rule or regulation or any material agreement, contract or other obligation binding upon or affecting the property of Company or any of its Subsidiaries. All Loans under the Credit Agreement shall be in full compliance with
all applicable requirements, including, to the extent applicable, the rules and regulations of the Board of Governors of the Federal Reserve System. 
 (k) Fees. Company shall have paid (i) without duplication of amounts described in clause (iii) below, such fees to Administrative Agent for distribution to the Increasing Lenders and
Additional Lenders as previously agreed by Company and Administrative Agent, (ii) to Administrative Agent and the Lenders all reasonable costs, fees and expenses (including, without limitation, reasonable legal fees and expenses of
Winston & Strawn LLP and the reasonable costs, fees and expenses referred to in Section 5(a)) payable to Administrative Agent or any other collateral agent or trustee acting for the benefit of the Lenders, as the case may be,
and the Lenders to the extent then due, and (iii) all fees due and payable pursuant to the Fee Letter dated March 12, 2008 between Company and Administrative Agent and Lead Arranger; 
 (l) Representations and Warranties. The representations and warranties contained in this Agreement, the Credit
Agreement and the other Loan Documents shall each be true and correct in all material respects at and as of the Revolver Increase Effective Date as though made on and as of the Revolver Increase Effective Date (except to the extent such
representations and warranties are expressly made as of a specified date in which event such representations and warranties shall be true and correct in all material respects as of such specified date). 
 (m) No Defaults. No Unmatured Event of Default or Event of Default under the Credit Agreement shall have
occurred and be continuing. 
 SECTION 5. MISCELLANEOUS. The parties hereto hereby further agree as
follows: 
 (a) Costs, Expenses and Taxes. Company hereby agrees to pay all reasonable fees, costs and
expenses of Administrative Agent incurred in connection with the negotiation, preparation and execution of this Agreement and the transactions contemplated hereby. 
 (b) Counterparts. This Agreement may be executed in any number of counterparts and by different parties hereto on separate counterparts, each of which counterparts, when so
executed and delivered, shall be deemed to be an original and all of which counterparts, taken together, shall constitute but one and the same Agreement. 
 (c) Headings. Headings used in this Agreement are for convenience of reference only and shall not affect the construction of this Agreement. 
  

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 (d) Integration. This Agreement and the Credit Agreement (as amended
hereby) constitute the entire agreement among the parties hereto with respect to the subject matter hereof. 
 (e) Governing Law. THIS AGREEMENT SHALL BE DEEMED TO BE A CONTRACT MADE UNDER THE LAWS OF THE STATE OF NEW YORK, AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS AND DECISIONS OF SAID STATE, INCLUDING
SECTIONS 5-1401 AND 5-1402 OF THE NEW YORK GENERAL OBLIGATIONS LAW BUT EXCLUDING ALL OTHER CHOICE OF LAW AND CONFLICTS OF LAWS RULES. 
 (f) Binding Effect. This Agreement shall be binding upon, and inure to the benefit of, Borrowers, Administrative Agent, the Lenders and their respective successors and assigns; provided,
however, that no Borrower may assign its rights or obligations hereunder or in connection herewith or any interest herein (voluntarily, by operation of law or otherwise) without the prior written consent of the Lenders. 
 (g) Agreement; Waiver. The parties hereto agree and acknowledge that nothing contained in this Agreement in any
manner or respect limits or terminates any of the provisions of the Credit Agreement or any of the other Loan Documents other than as expressly set forth herein and further agree and acknowledge that the Credit Agreement (as amended hereby) and each
of the other Loan Documents remain and continue in full force and effect and are hereby ratified and confirmed. Except to the extent expressly set forth herein, the execution, delivery and effectiveness of this Agreement shall not operate as a
waiver of any rights, power or remedy of the Lenders or Administrative Agent under the Credit Agreement or any other Loan Document, nor constitute a waiver of any provision of the Credit Agreement or any other Loan Document. No delay on the part of
any Lender or Administrative Agent in exercising any of their respective rights, remedies, powers and privileges under the Credit Agreement or any of the Loan Documents or partial or single exercise thereof, shall constitute a waiver thereof. On and
after the Revolver Increase Effective Date each reference in the Credit Agreement to “this Agreement,” “hereunder,” “hereof,” “herein” or words of like import, and each reference to the Credit Agreement in the
Loan Documents and all other documents delivered in connection with the Credit Agreement shall mean and be a reference to the Credit Agreement as deemed amended in connection with the Revolver Increase, pursuant to Section 2.10 of the Credit
Agreement. The Borrowers acknowledge and agree that this Agreement constitutes a “Loan Document” for purposes of the Credit Agreement. None of the terms and conditions of this Agreement may be changed, waived, modified or varied in any
manner, whatsoever, except in accordance with Section 12.1 of the Credit Agreement. 
 [Signature Pages Follow]

  

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 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed by their respective officers thereunto duly authorized, as of the date first written above. 
  

			
	TEXAS PETROCHEMICALS LP
	By:	 	Texas Petrochemicals Inc., its General Partner
		
	By:	 	 /s/ Ruth I. Dreessen

	Name:	 	 Ruth I. Dreessen

	Title:	 	 Chief Financial Officer

	
	TEXAS BUTYLENE CHEMICAL CORPORATION
		
	By:	 	 /s/ Christopher A. Artzer

	Name:	 	 Christopher A. Artzer

	Title:	 	 Vice President and Secretary

	
	 DEUTSCHE BANK TRUST COMPANY AMERICAS,
 in its individual capacity and as Administrative Agent

		
	By:	 	 /s/ Enrique Landaeta

	Name:	 	 Enrique Landaeta

	Title:	 	 Vice President

		
	By:	 	 /s/ Marguerite Sutton

	Name:	 	 Marguerite Sutton

	Title:	 	 Director

 Texas Petrochemicals, LP 
 Signature Page to 
 Joinder to Revolving Credit Agreement 

			
	LASALLE BUSINESS CREDIT, LLC
		
	By:	 	 /s/ Elizabeth J. Mitchell

	Name:	 	 Elizabeth J. Mitchell

	Title:	 	 Assistant Vice President

 Texas Petrochemicals, LP 
 Signature Page to 
 Joinder to Revolving Credit Agreement 

			
	CAPITAL ONE LEVERAGE FINANCE CORP., f/k/a North Fork Business Capital Corporation
		
	By:	 	 /s/ Nick Malatestinic

	Name:	 	 Nick Malatestinic

	Title:	 	 VP, Team Leader

 Texas Petrochemicals, LP 
 Signature Page to 
 Joinder to Revolving Credit Agreement 

			
	LLOYDS TSB BANK
		
	By:	 	 /s/ Jeremy Harrison

	Name:	 	 Jeremy Harrison

	Title:	 	 Director – ABL

 Texas Petrochemicals, LP 
 Signature Page to 
 Joinder to Revolving Credit Agreement 

 Annex I 
  

				
	 Lenders
	  	Commitment
	 Deutsche Bank Trust Company Americas
	  	$	18,000,000
	 LaSalle Business Credit, LLC
	  	$	34,800,000
	 Wachovia Bank, N.A.
	  	$	25,000,000
	 Wells Fargo Foothill, LLC
	  	$	20,000,000
	 Capital One Leverage Finance Corp.
	  	$	12,200,000
	 Allied Irish Bank, p.l.c.
	  	$	15,000,000

  

								
	 Lender
	  	Commitment	  	 Domestic Lending
 Office
	  	 Eurocurrency Lending
 Office

	 Lloyds TSB Bank
	  	$	15,000,000	  	 Provided separately to
 Administrative Agent
	  	 Provided separately to
 Administrative AgentFirst Amendment to Revolving Credit Agreement

 Exhibit 4.4 
 FIRST AMENDMENT TO REVOLVING CREDIT AGREEMENT 
 THIS FIRST AMENDMENT TO REVOLVING CREDIT AGREEMENT, dated as of February 10, 2009 (this “Agreement”), is made by and among Texas Petrochemicals LLC, a Texas limited liability company (“Company”) and
Texas Butylene Chemical Corporation, a Texas corporation (“Texas Butylene” and, together with Company, each individually referred to herein as a “Borrower” and collectively as “Borrowers”), and each
of the undersigned Lenders. 
 W I T N E S S E T H: 
 WHEREAS, the Borrowers, Deutsche Bank Trust Company Americas, acting in its capacity as administrative agent for the Lenders
(the “Agent”) and Bank of America, N.A. (as successor by merger to LaSalle Bank National Association), as collateral agent for the Lenders (the “Collateral Agent”) and certain financial institutions parties thereto
(each, a “Lender”; collectively, the “Lenders”) are parties to that certain Revolving Credit Agreement dated as of June 27, 2006 (as in effect from time to time, the “Credit Agreement”).

 WHEREAS, the Borrowers have requested certain amendments to the Credit Agreement, and the Agent and the
Lenders are willing to effect such amendments. 
 NOW, THEREFORE, in consideration of the recitals herein
contained and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 
 SECTION 1. DEFINITIONS. Unless otherwise defined herein, all capitalized terms used herein shall have the meanings given them in the Credit Agreement, as amended hereby. 
 SECTION 2. AMENDMENTS TO CREDIT AGREEMENT 
 (a) Section 1.1 — Definitions. Section 1.1 of the Credit Agreement is amended as follows: 
 (i) Applicable Margin. The definition of “Applicable Margin” is hereby amended by deleting such definition in its entirety and replacing it with the
following: 
 “Applicable Margin” shall mean, at any time with respect to any Eurocurrency Loan,
3.50% per annum, and at any time with respect to any Base Rate Loan, 2.50% per annum. 
 (ii) Applicable Margin Period. The definition of “Applicable Margin Period” is hereby amended by deleting such definition in its entirety. 
 (iii) Availability. The definition of “Availability” is hereby amended by
deleting such definition in its entirety and replacing it with the following: 
 “Availability”
means the result of (1) the lesser of (A) the Total Commitments and (B) the Borrowing Base minus (2) the Availability Block minus (3) Total Exposure. 

 (iv) Availability Block. A new defined
term “Availability Block” is hereby inserted in proper alphabetical order to read as follows: 
 “Availability Block” shall mean $15,000,000 at all times on or prior to June 30, 2009, $17,500,000 from July 1, 2009 through December 31, 2009 and $20,000,000 at all times on and after January 1,
2010. 
 (v) Borrowing Base. The definition of “Borrowing Base” is
hereby amended by inserting a new clause (c) at the conclusion thereof to read as follows: 
 (c) For
purposes of clause (a)(i) above, the Value of Eligible Accounts Receivable at any time shall be determined by the Administrative Agent based on the Borrowing Base Certificate most recently delivered pursuant to Section 7.2(g)(i); provided, that
without limiting the generality of clause (b) above, the Administrative Agent shall be entitled to increase or decrease reserves against Eligible Accounts Receivable based on increases or decreases in Eligible Accounts Receivable disclosed in
the Borrowing Base Certificates delivered pursuant to Section 7.2(g)(iii) (it being understood that in no event shall the Value of Eligible Accounts Receivable as determined from a weekly Borrowing Base Certificate be more than as determined
from the most recently delivered monthly Borrowing Base Certificate). 
 (vi) Liquidity
Event. The definition of “Liquidity Event” is hereby amended by deleting the first sentence of such definition in its entirety and replacing it with the following sentence: 
 “Liquidity Event” shall mean the determination by the Administrative Agent that Availability was less than
$20 million for five (5) or more consecutive days. 
 (vii) Majority
Lenders. The definition of “Majority Lenders” is hereby amended by deleting such definition in its entirety and replacing it with the following: 
 “Majority Lenders” shall mean, at any time, (i) with respect to any amendment, modification, supplement, waiver or other change to the definition of
“Availability”, the definition of “Availability Block”, the proviso at the conclusion of Section 2.1(a), or subclause (i)(A) of Section 3.1, those Lenders having more than 66.67% of the aggregate amount of the
Commitments or, if the Commitments shall have expired or been terminated, Lenders having more than 66.67% of the aggregate amount of the outstanding Exposures and (ii) with respect to all other matters, those Lenders having more than 50% of the
aggregate amount of the Commitments or, if the Commitments shall have expired or been terminated, Lenders having more than 50% of the aggregate amount of the outstanding Exposures; and for this purpose, a Lender’s
“Exposure” shall mean (assuming that any Interim Advances have been settled) the aggregate amount of such Lender’s outstanding Loans plus such Lender’s pro rata share (based on Loans) of outstanding Letter of
Credit Obligations. 
  

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 (b) Section 2.1 — Commitments; Delivery of
Notes. Section 2.1 of the Credit Agreement is hereby amended by restating the proviso appearing at the conclusion of clause (a) in its entirety as follows: 
 ; provided that no such Loan shall be made for the account of any Borrower if after giving effect to the making of such Loan
and the simultaneous application of the proceeds thereof, (i) the aggregate amount of the Exposure of such Lender would exceed the Commitment of such Lender or (ii) the Total Exposure for all Borrowers would exceed (1) the lesser of
(A) the Total Commitments and (B) subject to Section 2.2(b), the Borrowing Base minus (2) the Availability Block. 
 (c) Section 3.1 — Issuance of Letters of Credit. Section 3.1 is hereby amended by restating subclause (i) of clause (a) thereof in its entirety as follows:

 (i)(A) Total Exposure would exceed (1) the lesser of (a) the Total Commitments and (b) the
Borrowing Base minus (2) the Availability Block or (B) Letter of Credit Obligations would exceed $30,000,000 or (C) any Lender’s Exposure would exceed its Commitment; 
 (d) Section 7.2(g) — Borrowing Base Certificate. Section 7.2(g) is hereby amended by deleting
such Section 7.2(g) in its entirety and replacing it with the following: 
 (g)
Borrowing Base Certificate. (i) Within twelve (12) Business Days after the last Business Day of each fiscal month, (ii) at the Administrative Agent’s or Collateral Agent’s request upon the occurrence and during
the continuation of an Event of Default, and (iii) within two (2) Business Days after the last Business Day of each week, a borrowing base certificate in the form of Exhibit 7.2(g) (the “Borrowing Base Certificate”)
with all supporting detail as Administrative Agent or the Collateral Agent may from time to time reasonably require, duly completed, detailing Company’s understanding as to which Accounts or Inventory constitute Eligible Accounts Receivable and
Eligible Inventory as of (x) with respect to Accounts, the last day of such fiscal month (in the case of clause (i) above), such date as the Administrative Agent or the Collateral Agent may specify in such request (in the case of clause
(ii) above) or such week (in the case of clause (iii) above) and (y) with respect to Inventory, the last day of the most recently completed fiscal month (in the case of clauses (i) and (iii) above) or such date as the
Administrative Agent or the Collateral Agent may specify in such request (in the case of clause (ii) above), and certified by the chief accounting officer or chief financial officer of Company and subject only to adjustment upon completion of
the normal year-end audit of physical inventory. In addition, each Borrowing Base Certificate shall have attached to it such additional schedules and/or other information as the Administrative Agent or the Collateral Agent may reasonably request;
and 
  

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 (e) Section 9.1 — Fixed Charge Coverage.
Section 9.1 is hereby amended by deleting such Section 9.1 in its entirety and replacing it with the following: 
 9.1 Intentionally Omitted. 
 SECTION 3. REPRESENTATIONS AND WARRANTIES

 3.1. Representations and Warranties. In order to induce the Agent and the Lenders to enter
into this Agreement, the Borrowers hereby represent and warrant to the Agent and the Lenders, in each case after giving effect to this Agreement, as follows: 
 (a) Power and Authority. Each Borrower has the power and authority to execute, deliver and perform this Agreement and, in the case of each Borrower and each Credit
Party, all agreements, documents and instruments executed and delivered pursuant to this Agreement and each Borrower and each Credit Party has taken all necessary action to authorize the execution, delivery and performance by it of this Agreement
and all agreements, documents and instruments executed and delivered by it pursuant to this Agreement, as the case may be. 
 (b) Binding Obligation. This Agreement has been duly executed and delivered by each Borrower and the Acknowledgement and Consent (as hereinafter defined) has been duly executed by each
Subsidiary Guarantor, and such documents are the legal, valid and binding obligation of each such entity a party thereto, enforceable against such entity in accordance with its terms, except to the extent that the enforcement thereof may be limited
by applicable bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium or other similar laws generally affecting creditors’ rights and by equitable principles (regardless of whether enforcement is sought in equity or at law).

 (c) Incorporation of Representations and Warranties from the Credit Agreement. After giving
effect to this Agreement, the representations and warranties contained in the Credit Agreement and the other Loan Documents are true and correct in all material respects on and as of the Effective Date as though made on such date, except to the
extent that such representations and warranties are expressly made as of a specific date (in which event such representations and warranties shall have been true and correct on and as of such specified date). 
 (d) No Violation or Conflict. Neither execution, delivery and performance of this Agreement nor the
transactions contemplated hereby will (i) contravene in any material respect any Requirement of Law, (ii) conflict or be inconsistent with or result in any breach of any of the terms, covenants, conditions or provisions of, or constitute a
default under, or result in the creation or imposition of (or the obligation to create or impose) any Lien upon any of the properties or assets of any Borrower or any Subsidiary pursuant to the terms of any indenture, mortgage, deed of trust, credit
agreement or loan agreement, or any other agreement, contract or instrument, to which a Borrower or any Subsidiary is a party or by which it or any of its property or assets is bound or to which it may be subject, except for any such conflict,
breach or Lien which would not individually or in the aggregate reasonably be expected to have a Material Adverse Effect, or (iii) will violate or conflict with any Organizational Document of any Credit Party. 
  

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 (e) No Additional Consents Required. No authorization or
approval or other action by, and no notice to or filing or registration with, any Governmental Authority or other Person is required in connection with the execution, delivery and performance of this Agreement and all agreements, documents and
instruments executed and delivered pursuant to this Agreement other than those obtained and in full force and effect. 
 (f) Absence of Default. No Default or Event of Default will exist or be continuing. 
 (g) Good Standing. On the Effective Date, each Credit Party is a duly organized and validly existing entity in good standing in its jurisdiction of incorporation or formation. 
 SECTION 4. CONDITIONS PRECEDENT 
 4.1. Conditions to Effectiveness of Agreement. This Agreement shall become effective upon the date when each of the following conditions precedent have been satisfied (the “Effective
Date”): 
 (a) Execution and Delivery of Agreement. Each Borrower and the Majority
Lenders shall have executed and delivered this Agreement. 
 (b) Acknowledgement and Consent. The
Agent shall have received an acknowledgement and consent dated the Effective Date in the form of Exhibit A attached hereto (the “Acknowledgement and Consent”), duly executed and delivered by each Subsidiary Guarantor.

 (c) Fees. The Borrowers shall have paid (i) the Amendment Fee (as defined in
Section 5) to the Agent for distribution to the Consenting Lenders (as defined in Section 5) in the manner set forth in Section 5, (ii) to the Agent all reasonable costs, fees and expenses (including, without limitation, legal
fees and expenses of Winston & Strawn LLP) payable to the Agent to the extent then invoiced and due and (iii) all other fees and expenses due and payable to the Agent and/or any of it affiliates. 
 (d) No Defaults. After giving effect to this Agreement, no Default or Event of Default under the Credit
Agreement shall have occurred and be continuing. 
 (e) Representations and Warranties. After
giving effect to this Agreement, the representations and warranties of the Borrowers and the other Credit Parties contained in the Credit Agreement and the other Loan Documents are true and correct in all material respects on and as of the Effective
Date as though made on such date, except to the extent that such representations and warranties are expressly made as of a specific date (in which event such representations and warranties shall have been true and correct on and as of such specified
date). 
 SECTION 5. AMENDMENT FEE. In consideration of the execution of this Agreement by the Lenders, the Borrowers
hereby agree to pay on the Effective Date to each Lender that executes this Agreement on or prior to 5:00 p.m. New York time on February 10, 2009 (each, a “Consenting Lender”), a fee (collectively, the “Amendment Fee”)
in an amount equal to 0.25% multiplied by such Lender’s Commitment. 
  

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 SECTION 6. MISCELLANEOUS 
 6.1. Miscellaneous. The parties hereto hereby further agree as follows: 
 (a) Counterparts. This Agreement may be executed in one or more counterparts, each of which, when executed and delivered, shall be deemed to be an original and all of which counterparts,
taken together, shall constitute but one and the same document with the same force and effect as if the signatures of all of the parties were on a single counterpart, and it shall not be necessary in making proof of this Agreement to produce more
than one (1) such counterpart. 
 (b) Headings. Headings used in this Agreement are for
convenience of reference only and shall not affect the construction of this Agreement. 
 (c)
Integration. This Agreement, the other agreements and documents executed and delivered pursuant to this Agreement and the Credit Agreement constitute the entire agreement among the parties hereto with respect to the subject matter hereof.

 (d) Governing Law. THIS AGREEMENT SHALL BE DEEMED TO BE A CONTRACT MADE UNDER THE LAWS OF THE
STATE OF NEW YORK, AND THE RIGHTS AND DUTIES OF THE BORROWERS, THE AGENT, EACH ISSUING BANK AND THE LENDERS UNDER THIS AGREEMENT AND ANY OTHER DOCUMENTS EXECUTED IN CONNECTION HEREWITH SHALL, PURSUANT TO NEW YORK GENERAL OBLIGATIONS LAW
SECTION 5-1401, BE GOVERNED BY THE INTERNAL LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO CONFLICT OF LAW PRINCIPLES. 
 (e) Binding Effect. This Agreement shall be binding upon and inure to the benefit of and be enforceable by each Borrower, the Agent and the Lenders and their respective successors and
assigns. Except as expressly set forth to the contrary herein, this Agreement shall not be construed so as to confer any right or benefit upon any Person other than the each Borrower, the Agent and the Lenders and their respective successors and
permitted assigns. 
 (f) Limitations. Except as expressly provided herein, the execution and
delivery of this Agreement shall not: (a) constitute an extension, modification, or waiver of any aspect of the Credit Agreement or the other Loan Documents; (b) extend the terms of the Credit Agreement or the due date of any of the
Obligations; (c) give rise to any obligation on the part of the Agent and the Lenders to extend, modify or waive any term or condition of the Credit Agreement or any of the other Loan Documents; or (d) give rise to any defenses or
counterclaims to the right of the Agent and the Lenders to enforce its or their rights and remedies under the Credit Agreement and the other Loan Documents. 
 (g) Reference to and Effect on the Credit Agreement. The parties hereto agree and acknowledge that nothing contained in this Agreement in any manner or respect limits
or terminates any of the provisions of the Credit Agreement or any of the other Loan Documents other than as expressly set forth herein and further agree and acknowledge that the

  

 6 

 
Credit Agreement (as amended hereby) and each of the other Loan Documents remain and continue in full force and effect and are hereby ratified and confirmed. Except to the extent expressly set
forth herein, the execution, delivery and effectiveness of this Agreement shall not operate as an amendment of any rights, power or remedy of the Lenders or the Agent under the Credit Agreement or any other Loan Document, nor constitute an amendment
of any provision of the Credit Agreement or any other Loan Document. On and after the Effective Date each reference in the Credit Agreement to “this Agreement,” “hereunder,” “hereof,”
“herein” or words of like import, and each reference to the Credit Agreement in the Loan Documents and all other documents delivered in connection with the Credit Agreement shall mean and be a reference to the Credit Agreement as
amended hereby. Each Borrower acknowledges and agrees that this Agreement constitutes a “Loan Document” for purposes of the Credit Agreement. None of the terms and conditions of this Agreement may be changed, waived, modified or
varied in any manner, whatsoever, except in accordance with Section 12.1 of the Credit Agreement. 
 [signature
pages follow] 
  

 7 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective officers thereunto duly authorized, as of the date first written above. 
  

			
	BORROWERS:
	
	 TEXAS PETROCHEMICALS LLC, as a Borrower

		
	 By:
	 	 /s/ Ruth I. Dreessen

	 Title:
	 	 Chief Financial Officer

	
	 TEXAS BUTYLENE CHEMICAL CORPORATION,
 as a Borrower

		
	 By:
	 	 /s/ Ruth I. Dreessen

	 Title:
	 	 Chief Financial Officer

	
	 LENDERS:

	
	DEUTSCHE BANK TRUST COMPANY AMERICAS
		
	 By:
	 	 /s/ Enrique Landaeta

	 Title:
	 	 Enrique Landaeta, Vice President

		
	 By:
	 	 /s/ Marguerite Sutton

	 Title:
	 	 Marguerite Sutton, Director

	
	 BANK OF AMERICA, N.A.

		
	 By: 
	 	 /s/ [illegible signature]

	 Title:
	 	 Senior Vice President

 Signature Page to First Amendment to Credit Agreement 

			
	 ALLIED IRISH BANK, P.L.C.

		
	 By:
	 	 /s/ Martin Chin

	 Title:
	 	 Martin Chin, Senior Vice President

		
	 By:
	 	 /s/ Brent Phillips

	 Title:
	 	 Brent Phillips, Vice President

	
	 CAPITAL ONE LEVERAGE FINANCE CORP.,
 f/k/a North Fork Business Capital Corporation

		
	 By:
	 	  

	 Title:
	 	  

	
	 WACHOVIA BANK, N.A.

		
	 By: 
	 	 /s/ M. Miller Jr.

	 Title:
	 	 Director

	
	 WELLS FARGO FOOTHILL, LLC

		
	 By: 
	 	 /s/ Rohan Damani

	 Title:
	 	 Vice President

	
	 LLOYDS TSB BANK

		
	 By: 
	 	 /s/ Jeremy Harrison

	 Title:
	 	 Jeremy Harrison, Director H067

		
	 By:
	 	 /s/ Alexander Wilson

	 Title:
	 	 Alexander Wilson, Director

		 	 Financial Institutions, USA W055

 Signature Page to First Amendment to Amended and Restated Credit Agreement

 ACKNOWLEDGMENT AND CONSENT 
 The undersigned entities, constituting Subsidiaries of the Borrowers (each, a “Subsidiary Guarantor”),
hereby (a) acknowledge that they have reviewed the terms and provisions of (i) the Revolving Credit Agreement dated as of June 27, 2006 (as amended, the “Credit Agreement”), by and among Texas Petrochemicals LLC, a
Texas limited liability company (“Company”), and Texas Butylene Chemical Corporation, a Texas corporation (“Texas Butylene” and, together with Company, each individually referred to herein as a
“Borrower” and collectively as “Borrowers”), the financial institutions party thereto as Lenders, Deutsche Bank Trust Company Americas, acting in its capacity as administrative agent (the “Agent”)
and Bank of America, N.A. (as successor by merger to LaSalle Bank National Association), as collateral agent and (ii) the First Amendment to Revolving Credit Agreement (the “Amendment”) and (b) consent to the amendment of
the Credit Agreement pursuant to the Amendment and the other matters contemplated under the Amendment. 
 Each
Subsidiary Guarantor hereby acknowledges and agrees that any of the Loan Documents to which it is a party or otherwise bound shall continue in full force and effect and that all of its obligations thereunder shall be valid and enforceable and shall
not be impaired or affected by the execution or effectiveness of the Amendment. Each Subsidiary Guarantor represents and warrants that all representations and warranties applicable to it contained in the Credit Agreement as amended by the Amendment
and the Loan Documents to which it is a party or otherwise bound are true and correct in all material respects on and as of the Effective Date (except to the extent that such representations and warranties are expressly made as of a specific date,
in which event such representations and warranties shall have been true and correct on and as of such specified date). 
 Each Subsidiary Guarantor acknowledges and agrees that (i) notwithstanding the conditions to effectiveness set forth in the Amendment, each Subsidiary Guarantor is not required by the terms of the Credit Agreement or any other Loan
Document to consent to the amendment of the Credit Agreement effected pursuant to the Amendment and (ii) nothing in the Credit Agreement or the Amendment or any other Loan Document shall be deemed to require the consent of any Subsidiary
Guarantor to any future amendment of the Credit Agreement or any other Loan Document. 
 [signature page follows]

 IN WITNESS WHEREOF, each of the Subsidiary Guarantors has caused this
Acknowledgement and Consent to First Amendment to Revolving Credit Agreement to be duly executed and delivered by its proper and duly authorized officer as of the 10th day of February, 2009. 
  

			
	 TP CAPITAL CORP.

		
	 By:
	 	 /s/ Ruth I. Dreessen

	 Name:
	 	 Ruth I. Dreessen

	 Title:
	 	 Chief Financial Officer

	
	 TEXAS OLEFINS DOMESTIC-INTERNATIONAL
 SALES CORPORATION

		
	 By:
	 	 /s/ Ruth I. Dreessen

	 Name:
	 	 Ruth I. Dreessen

	 Title:
	 	 Chief Financial Officer

	
	 PORT NECHES FUELS, LLC

		
	 By:
	 	 /s/ Ruth I. Dreessen

	 Name:
	 	 Ruth I. Dreessen

	 Title:
	 	 Chief Financial Officer

 Signature Page to Acknowledgment and Consent

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