Document:

Exhibit 4.1_ 2013.06.30

Exhibit 4.1
BORROWER JOINDER AGREEMENT

THIS BORROWER JOINDER AGREEMENT (this "Joinder Agreement"), dated as of May 1, 2013 is entered into between NORTH AMERICAN SPECIALTY PRODUCTS LLC, a Delaware limited liability company (the "Additional Borrower"), the Existing Borrowers (as defined below) and BANK OF AMERICA, N.A., in its capacity as Administrative Agent (the "Agent") under that certain Second Amended and Restated Credit Agreement, dated as of September 16, 2011, among the Borrowers named herein, as Borrowers (the "Existing Borrowers"), the Lenders party thereto, and the Agent (including all annexes, exhibits, and schedules thereto, as from time to time amended, restated, supplemented, or otherwise modified, the "Credit Agreement"). All capitalized terms used herein and not otherwise defined shall have the meaning set forth in the Credit Agreement.

The Additional Borrower has indicated its desire to become "Borrower" under the Credit Agreement.

Accordingly, the Additional Borrower hereby agrees as follows with the Agent, for the benefit of the Lenders:

1.    The Additional Borrower does hereby acknowledge, agree and confirm that, by its execution of this Joinder Agreement, it will be deemed to be a party to the Credit Agreement and "Borrower" for all purposes of the Credit Agreement and the other Loan Documents, and shall have all of the obligations of Borrowers thereunder as if it had executed the Credit Agreement and the other Loan Documents to which Borrowers are parties.  The Additional Borrower does hereby ratify, as of the date hereof, and agree to be bound by, all of the terms, provisions and conditions contained in the Loan Documents applicable to Borrowers thereunder.

2.    The Additional Borrower does acknowledge and confirm that it has received a copy of the Credit Agreement and the schedules and exhibits thereto.

3.    The Existing Borrowers and Guarantors confirm that, notwithstanding the joinder of the Additional Borrower to the Loan Documents, all of their obligations under the Credit Agreement and the other Loan Documents are and shall continue to be in full force and effect.  The Existing Borrowers and Guarantors acknowledge and agree that they have guaranteed all obligations of such Additional Borrower in accordance with the terms of the Credit Agreement.

4.    The Additional Borrower does hereby agree that it is jointly and severally liable for all Obligations with other Borrowers. 

5.    The Additional Borrower agrees that at any time and from time to time, upon the written request of the Agent, it will execute and deliver such further documents and do such further acts and things as the Agent may reasonably request in order to effect the purposes of this Joinder Agreement.

6.    The addresses of the Additional Borrower for purposes of Section 13.8 of the Credit Agreement shall be the same as the addresses of the Borrowers set forth in such Section.

7.    This Joinder Agreement may be executed in two or more counterparts, each of which shall constitute an original but all of which when taken together shall constitute one document.

8.    This Joinder Agreement shall become effective, and the Additional Borrower shall become Borrower, upon due execution by the Agent of this Joinder Agreement and receipt by the Agent of counterparts hereof duly executed by the Additional Borrower, the Existing Borrowers, and Guarantors.

9.    THIS JOINDER AGREEMENT, AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER, SHALL BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

Remainder of Page Intentionally Left Blank
Signature Page(s) Follow(s)

IN WITNESS WHEREOF, the Additional Borrower and the Borrowers and Guarantors have caused this Joinder Agreement to be duly executed by their authorized officers, and the Agent, for the benefit of the Lenders, has caused the same to be accepted and agreed to by its authorized officer, as of the day and year first above written.

	
			
	ADDITIONAL BORROWER:

	 

	NORTH AMERICAN SPECIALTY PRODUCTS LLC,
a Delaware limited liability company

	 
	 
	 

	 
	 
	 

	By:
	 
	North American Pipe Corporation, its manager

	 
	 
	 

	By:
	 
	/s/    Robert F. Buesinger        

	 
	 
	Robert F. Buesinger

	 
	 
	President of the manager of the Additional Borrower

	
			
	BORROWERS AND GUARANTORS:

	 

	WESTLAKE CHEMICAL CORPORATION,
a Delaware corporation 

	WESTLAKE PVC CORPORATION, a Delaware corporation

	WESTLAKE VINYLS, INC., a Delaware corporation

	WESTLAKE LONGVIEW CORPORATION, 
a Delaware corporation

	WESTLAKE ETHYLENE PIPELINE CORPORATION,
a Delaware corporation

	WESTLAKE SUPPLY AND TRADING COMPANY, 
a Delaware corporation

	 
	 
	 

	 
	 
	 

	By:
	 
	/s/    Albert Chao        

	 
	 
	Albert Chao

	 
	 
	President of the above Borrowers and Guarantors

Signature Page to Borrower Joinder Agreement

	
			
	NORTH AMERICAN PIPE CORPORATION,
a Delaware corporation

	WESTECH BUILDING PRODUCTS, INC.,
a Delaware corporation

	 
	 
	 

	 
	 
	 

	By:
	 
	/s/    Robert F. Buesinger        

	 
	 
	Robert F. Buesinger

	 
	 
	President of the above Borrowers and Guarantors

Signature Page to Borrower Joinder Agreement

	
			
	WESTLAKE VINYLS COMPANY LP,
a Delaware limited partnership

	 
	 
	 

	 
	 
	 

	By:
	 
	GVGP, Inc., its general partner

	 
	 
	 

	By:
	 
	/s/    Albert Chao        

	 
	 
	Albert Chao

	 
	 
	President of the general partner of the above Borrower and Guarantor

	
			
	WESTLAKE PETROCHEMICALS LLC,
a Delaware limited liability company

	WESTLAKE POLYMERS LLC, 
a Delaware limited liability company

	WESTLAKE STYRENE LLC,
a Delaware limited liability company

	WPT LLC, a Delaware limited liability company

	 
	 
	 

	 
	 
	 

	By:
	 
	Westlake Chemical Investments, Inc., its manager

	 
	 
	 

	By:
	 
	/s/    Albert Chao        

	 
	 
	Albert Chao

	 
	 
	President of the manager of the above Borrowers and Guarantors

Signature Page to Borrower Joinder Agreement

	
			
	GUARANTORS:

	 

	GEISMAR HOLDINGS, INC.,
a Delaware corporation

	WESTLAKE DEVELOPMENT CORPORATION,
a Delaware corporation

	GVGP, INC., a Delaware corporation

	WESTLAKE CHEMICAL INVESTMENTS, INC.,
a Delaware corporation

	WESTLAKE MANAGEMENT SERVICES, INC.,
a Delaware corporation

	WESTLAKE OLEFINS CORPORATION,
a Delaware corporation

	WESTLAKE RESOURCES CORPORATION,
a Delaware corporation

	WESTLAKE VINYL CORPORATION,
a Delaware corporation

	WESTLAKE NG I CORPORATION,
a Delaware corporation

	WESTLAKE NG IV CORPORATION,
a Delaware corporation

	WESTLAKE NG V CORPORATION,
a Delaware corporation

	 
	 
	 

	 
	 
	 

	By:
	 
	/s/    Albert Chao        

	 
	 
	Albert Chao

	 
	 
	President of the above Guarantors

Signature Page to Borrower Joinder Agreement

	
			
	WESTLAKE GEISMAR POWER COMPANY LLC, a Delaware limited liability company

	 
	 
	 

	 
	 
	 

	By:
	 
	Westlake Vinyls Company LP, its manager

	 
	 
	 

	By:
	 
	GVGP, Inc., its general partner

	 
	 
	 

	By:
	 
	/s/    Albert Chao        

	 
	 
	Albert Chao

	 
	 
	President of the general partner of the manager of the above Guarantor

	
			
	WESTLAKE PIPELINE INVESTMENTS LLC, a Delaware limited liability company

	 
	 
	 

	 
	 
	 

	By:
	 
	Westlake Chemical Investments, Inc., its manager

	 
	 
	 

	By:
	 
	/s/    Albert Chao        

	 
	 
	Albert Chao

	 
	 
	President of the manager of the above Guarantor

Signature Page to Borrower Joinder Agreement

	
			
	ACCEPTED AND AGREED:

	 

	AGENT:

	 

	BANK OF AMERICA, N.A., as Agent

	 
	 
	 

	 
	 
	 

	By:
	 
	/s/    Hance VanBeber        

	 
	 
	Hance VanBeber

	 
	 
	Senior Vice President

Signature Page to Borrower Joinder AgreementExhibit 4.2_ 2013.06.30

Exhibit 4.2
SUPPLEMENTAL INDENTURE
SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"), dated as of May 1, 2013, among North American Specialty Products LLC, a Delaware limited liability company (the "Guaranteeing Subsidiary"), Westlake Chemical Corporation, a Delaware corporation (the "Company"), the other Subsidiary Guarantors (as defined in the Indenture referred to herein) and The Bank of New York Mellon Trust Company, N.A. (as successor to JPMorgan Chase Bank, National Association), as trustee under the Indenture referred to below (the "Trustee").
W I T N E S S E T H
WHEREAS, the Company and the Subsidiary Guarantors have heretofore executed and delivered to the Trustee an indenture dated as of January 1, 2006, as supplemented by that certain First Supplemental Indenture dated as of January 13, 2006, that certain Second Supplemental Indenture dated as of November 1, 2007 (the "Second Supplemental Indenture") providing for the issuance of the Company's 63⁄4% Senior Notes due 2032 (the "63⁄4% Senior Notes"), that certain Third Supplemental Indenture dated as of July 2, 2010 (the "Third Supplemental Indenture") providing for the issuance of the Company's 6.50% Senior Notes due 2029 (the "6.50% Senior Notes"), that certain Fourth Supplemental Indenture dated as of December 2, 2010 (the "Fourth Supplemental Indenture") providing for the issuance of the Company's 6.50% Senior Notes due 2035 (the "6.50% Senior (GO Zone) Notes"), that certain Fifth Supplemental Indenture dated as of December 2, 2010 (the "Fifth Supplemental Indenture") providing for the issuance of the Company's 6.50% Senior Notes due 2035 (the "6.50 Senior (IKE Zone) Notes"), that certain Sixth Supplemental Indenture dated as of July 17, 2012 (the "Sixth Supplemental Indenture") providing for the issuance of the Company's 3.600% Senior Notes due 2022 (the "3.600% Senior Notes") and that certain Seventh Supplemental Indenture dated as of February 12, 2013 (as so supplemented, the "Indenture");
WHEREAS, Section 4.16 of each of the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth Supplemental Indenture and the Fifth Supplemental Indenture and Section 4.11 of the Sixth Supplemental Indenture provides that under certain circumstances a Domestic Subsidiary of the Company shall execute and deliver to the Trustee a supplemental indenture pursuant to which such Domestic Subsidiary shall fully and unconditionally guarantee all of the Company's payment obligations under the 63⁄4% Senior Notes, the 6.50% Senior Notes, the 6.50% Senior (GO Zone) Notes, the 6.50% Senior (IKE Zone) Notes, and the 3.600% Senior Notes (collectively, the "Notes"), respectively, and the Indenture on the terms and conditions set forth therein (collectively, the "Note Guarantee"); 
WHEREAS, Section 9.01(4) of the Indenture provides that, without the consent of any Holder (as defined therein), the Company, the Subsidiary Guarantors and the Trustee may amend or supplement the Indenture to add guarantees of or additional obligors on each series of the Notes or the related Note Guarantee; 
WHEREAS, the Guaranteeing Subsidiary desires to become a Subsidiary Guarantor under the Indenture and to have the Note Guarantee be treated as a Guarantee under the Indenture; and
WHEREAS, the Company and the Subsidiary Guarantors, pursuant to the foregoing authority, propose to amend and supplement the Indenture in certain respects to provide for the Note Guarantee.
NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Company, the Guaranteeing Subsidiary, the other Subsidiary Guarantors and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of each series of the Notes as follows:
1.    CAPITALIZED TERMS.  Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.
2.    AGREEMENT TO GUARANTEE.  The Guaranteeing Subsidiary hereby agrees that (i) it shall be a Subsidiary Guarantor under the Indenture with respect to each series of the Notes, (ii) the Note Guarantee is a "Guarantee" (as defined in Section 10.01(b) of the Indenture) as such term is used in the Indenture, including, without limitation, Article X thereof, and (iii) the terms and provisions of Article X apply to the Note Guarantee.
3.    NEW YORK LAW TO GOVERN.  THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE BUT WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

4.    COUNTERPARTS.  The parties may sign any number of copies of this Supplemental Indenture.  Each signed copy shall be an original, but all of them together represent the same agreement.
5.    EFFECT OF HEADINGS.  The Section headings herein are for convenience only and shall not affect the construction hereof.
6.    THE TRUSTEE.  The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiary, the other Subsidiary Guarantors and the Company.
7.    TRUST INDENTURE ACT CONTROLS.  If any provision of this Supplemental Indenture limits, qualifies or conflicts with the duties imposed by TIA §318(c), the imposed duties will control.
8.    SUPPLEMENTAL INDENTURE INCORPORATED INTO INDENTURE.  The terms and conditions of this Supplemental Indenture shall be deemed to be part of the Indenture for all purposes with respect to the respective series of the Notes and the related Note Guarantee.  The Indenture is hereby incorporated by reference herein and, as supplemented by this Supplemental Indenture, is in all respects adopted, ratified and confirmed.
9.    NOTES DEEMED CONFORMED.  As of the date hereof, the provisions of each series of the Notes shall be deemed to be conformed, without the necessity for any reissuance or exchange of any such Note or any other action on the part of the Holders of such series of the Notes, the Company, any Subsidiary Guarantor or the Trustee, so as to reflect this Supplemental Indenture.
10.    SUCCESSORS.  All agreements of the Guaranteeing Subsidiary in the Indenture will bind its successors, except as otherwise expressly provided in the Indenture.
11.    SEVERABILITY.  In case any provision in this Supplemental Indenture is invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions will not in any way be affected or impaired thereby.

2

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and attested, all as of the date first above written.

	
			
	COMPANY:

	 
	 
	 

	WESTLAKE CHEMICAL CORPORATION

	 
	 
	 

	 
	 
	 

	By:
	 
	/s/    Albert Chao        

	 
	 
	Albert Chao

	 
	 
	President and Chief Executive Officer

	
				
	GUARANTEEING SUBSIDIARY:

	 
	 
	 
	 

	NORTH AMERICAN SPECIALTY PRODUCTS LLC

	 
	 
	 
	 

	 
	 
	 
	 

	By:
	 
	North American Pipe Corporation, 
its Manager

	 
	 
	 
	 

	 
	 
	By:
	/s/    Robert F. Buesinger        

	 
	 
	Name:
	Robert F. Buesinger

	 
	 
	Title:
	President 

[Signature Page to NASP Supplemental Indenture]

	
				
	EXISTING SUBSIDIARY GUARANTORS:

	 
	 
	 
	 

	 
	Geismar Holdings, Inc.

	 
	GVGP, Inc.

	 
	Westlake Chemical Investments, Inc.

	 
	Westlake Development Corporation

	 
	Westlake Ethylene Pipeline Corporation

	 
	Westlake Geismar Power Company LLC
    By Westlake Vinyls Company LP, 
        its Manager
    By GVGP, Inc., 
        its General Partner

	 
	Westlake Longview Corporation

	 
	Westlake Management Services, Inc.

	 
	Westlake NG I Corporation

	 
	Westlake NG IV Corporation

	 
	Westlake NG V Corporation

	 
	Westlake Olefins Corporation

	 
	Westlake Petrochemicals LLC,
    By Westlake Chemical Investments, Inc., 
        its Manager

	 
	Westlake Pipeline Investments LLC,
    By Westlake Chemical Investments, Inc., 
        its Manager

	 
	Westlake Polymers LLC,
    By Westlake Chemical Investments, Inc., 
        its Manager

	 
	Westlake PVC Corporation

	 
	Westlake Resources Corporation

	 
	Westlake Styrene LLC,
    By Westlake Chemical Investments, Inc., 
        its Manager

	 
	Westlake Supply and Trading Company

	 
	Westlake Vinyl Corporation

	 
	Westlake Vinyls Company LP,
    By GVGP, Inc., 
        its General Partner

	 
	Westlake Vinyls, Inc.

	 
	WPT LLC,
    By Westlake Chemical Investments, Inc., 
        its Manager

	 
	 
	 
	 

	 
	 
	 
	 

	 
	By:
	 
	/s/    Albert Chao        

	 
	Name:
	 
	Albert Chao

	 
	Title:
	 
	President

[Signature Page to NASP Supplemental Indenture]

	
				
	 
	North American Pipe Corporation

	 
	Westech Building Products, Inc.

	 
	 
	 
	 

	 
	 
	 
	 

	 
	By:
	 
	/s/    Robert F. Buesinger        

	 
	Name:
	 
	Robert F. Buesinger

	 
	Title:
	 
	President

[Signature Page to NASP Supplemental Indenture]

	
			
	Trustee:

	 
	 
	 

	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

	 
	 
	 

	 
	 
	 

	By:
	 
	/s/    Teresa Petta        

	 
	 
	Authorized Signatory

[Signature Page to NASP Supplemental Indenture]

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