Document:

EX-10.33

 Exhibit 10.33 

CONFIDENTIAL TREATMENT REQUESTED UNDER 
 C.F.R. SECTIONS
200.80(b)(4), 200.83 AND 230.406. 
 [*****] INDICATES OMITTED MATERIAL THAT IS THE 

SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST 
 FILED SEPARATELY
WITH THE COMMISSION. 
 THE OMITTED MATERIAL HAS BEEN FILED 

SEPARATELY WITH THE COMMISSION. 
  

 
 AMENDMENT AGREEMENT NO. 1

 TO THE 
 SSBR
CONVERSION AND CAPACITY RIGHTS AGREEMENT 
  
  

This amendment agreement No. 1 (the “Amendment”) to the SSBR CONVERSION AND CAPACITY RIGHTS AGREEMENT effective from 31 May 2007 (the
“SSBR Agreement”) is entered into on 3 December 2012 by and between Styron Europe GmbH (“Styron”) and JSR Corporation Tokyo Wallisellen Branch (“JSR”, Styron and JSR each a “Party”, together
the “Parties”). 
 WHEREAS 
  

	 	(A)	Dow Europe GmbH entered into the SSBR Agreement with JSR and subsequently assigned and transferred the SSBR Agreement to Styron and Styron assumed the SSBR Agreement with effect from 17June 2010. 

 

	 	(B)	The Parties seek to document their discussions and formalize agreements made in the recent past, in particular in a face to face meeting on March 8 and 9, 2012 in Schkopau, Germany, by amending the SSBR Agreement
with this Amendment. 

 NOW, THEREFORE, in consideration of the mutual promises and agreements made in and their relationship based on
the SSBR Agreement, the Parties agree to amend the SSBR Agreement as set out below. Words and phrases defined in the SSBR Agreement shall have the same meaning in this Amendment unless the context otherwise requires. Reference to Articles and
Schedules shall be reference to articles and schedules of the SSBR Agreement. In light of the assignment of the SSBR Agreement from Dow Europe GmbH to Styron, the term “DOW” as appears throughout the SSBR Agreement shall read as
“Styron”. 
 1. Amendment of Article 1 (Definition of “Commercialized Grades” and “Unplanned Shutdown”). 

1.1 Article 1.12 shall be deleted in its entirety and replaced with the following: 

“1.12 “Commercialized Grades” means all grades of SSBR (a) that have been produced as Developmental Grades at least three
(3) times without any major change in either of (i) the respective recipe or (ii) the relevant manufacturing process conditions during the commercialization process and are therefore deemed mature to be commercially produced in the
New Train, (b) that have reached an average productivity of [****] or more per day for a batch polymerization grade and [****]or more per day for a continuous polymerization grade, and (c) where the respective Product Specifications have
been agreed upon by the Parties. Any exceptions to the commercialization process of a SSBR grade, including any acceleration, require mutual agreement by the Parties. For the purpose of this Article 1.12, the average productivity shall be calculated
using the formula set out below: 
 [****] 

For the purpose of this calculation, (i) any days on which an Unplanned Shutdown occurs, (ii) any days on which production volume of
the Products decreases due to the same causes as an Unplanned Shutdown, and (iii) any days on which production volume of the Products decreases due to shortage of raw materials shall be excluded from this calculation.” 

  
 Confidential 

 Further to and in connection with the amendment of Article 1.12 Article 9 shall be amended as set out in
Paragraph 5 of this Amendment. 
 1.2 Article 1.52 shall be deleted in its entirety and replaced with the following: 

“1.52 “Unplanned Shutdown” shall mean an unscheduled event of more than twenty-four (24) hours (less than thirty
(30) MT as measured in packaging per day measured from 0:00 to 23:59), caused by equipment break down or external factors such as utility supply, severe weather conditions, and operational mistakes. Notwithstanding the foregoing, shutdown time
caused by unstable manufacturing conditions on the way to establish the manufacturing technology in the development stage, starting day of polymerization and planned cleaning days for the change between Styron Time Slots and JSR Time Slots as well
as any blockage or alike issue due to or caused by product properties like gel content despite changing and cleaning polymer filters every four (4) days and in case of a pressure drop or increase (as the case may be) of the polymer filter of
1.5 bar or more, such pressure drop or increase being solely considered as indication for gel content and/or gel formation, shall be excluded from the shutdown time for a calculation of an Unplanned Shutdown.” 

2. Amendment of Article 4 (Sub-Paragraph of “Supply and Off-Take of Product”) 

2.1 Article 4.5 shall be amended to include the following new paragraphs at the end of it: 

“Notwithstanding the foregoing, the Parties agree that: 

Unplanned Shutdowns 
  

	 	(a)	the Calendar Days of (an) Unplanned Shutdown(s) shall be counted in each Time Slot. If the Calendar Days of an Unplanned Shutdown in one Party’s Time Slot exceed an aggregate of three (3) Calendar Days, then
any time in excess of these three (3) Calendar Days shall be shared between the Parties in equal shares; 

 Example
(for illustration purposes only): 
 If during any of either JSR’s or Styron’s respective Time Slot the following occurs: 

 

													
	 	  	 Days of
Unplanned

Shutdown
	 	  	 Occurrence

during
Time Slot
	 	  	Aggregate
in a Time
Slot	 
		  	 	5 days	  	  	 	2 times	  	  	 	10 days	  
		  	 	3 days	  	  	 	1 time	  	  	 	3 days	  
		  	 	2 days	  	  	 	3 times	  	  	 	6 days	  
	 Total
	  				  				  	 	19 days	  

 In this example, the Parties will share in equal portions sixteen (16) Calendar Days of the Unplanned
Shutdown, resulting from the total of 19 Calendar Days minus 3 days. 

  
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 Cleaning 
  

	 	(b)	Prior to the beginning of each Styron Time Slot, Styron will conduct a complete cleaning of all batch reactors that are not “clean” or “clean enough”. Prior to the beginning of each JSR Time Slot,
the Parties shall discuss in good faith and may agree to change the planned cleaning days prior to the scheduled start of the next Styron Time Slot, taking into due consideration the actual days spent for the cleaning after the previous three
(3) JSR Time Slots. If (i) the actual cleaning time exceeds or is less than seven (7) Calendar Days, or (ii) the number of cleaning days changed due to the Parties’ good faith considerations referred to in the immediately
preceding sentence, as applicable, the additionally required or spare (unused) days, as the case may be, will be taken into account and the balance will be readdressed within the next JSR Time Slot, or any other JSR Time Slot following thereafter as
the Parties may agree, acting reasonably. Notwithstanding the foregoing, Styron may, in its discretion, conduct the cleaning of any batch reactor that is, or in case of doubt or dispute is verified to be, “clean” or “clean
enough” as Styron sees appropriate, provided however, that Styron shall bear all costs and time for such cleaning, it being acknowledged and agreed that notwithstanding the other provisions regarding cost allocation and/or time sharing in this
Agreement, no portion of any costs and time related to such cleaning (of a batch reactor that is, or in case of doubt or dispute is verified to be, “clean” or “clean enough”) shall be charged to or shared by JSR;

  

	 	(c)	Styron will clean the filter once every four (4) to six (6) Calendar Days if indicated. Indication for filter replacement shall be a pressure drop or Increase (as the case may be) of 1.5 bar or more, or such
other time intervals and/or indication parameters, including a different pressure drop or increase, as the Technical Committee may deem necessary and/or appropriate from time to time and agree on by way of technical protocol (in each case,
“Agreed Procedure”) which, once agreed, shall be binding between the Parties for the time being and supersede previously agreed time intervals and or indication parameters; 

 

	 	(d)	the costs relative to such Cleaning in accordance with Article 4.5 (b), Sentence 1 and 2 only, and (c) shall be allocated and dealt with in accordance with the fourth major bullet point under Paragraph 2.1 of
Schedule 2; 

  

	 	(e)	in the event that any gel formation during a JSR Time Slot unexpectedly damages Styron plant equipment, JSR will incur all cost related to the necessary repair and bear fully the respective lost production time and
reimburse Styron accordingly and upon first demand, however, on the condition that JSR receives a reasonable explanation from or on behalf of Styron giving the reason for the damaging the plant equipment. In the event JSR does not accept and/or
agree with said explanation, the Parties shall meet at the appropriate level and with the support of their relevant internal as well as, if necessary, external technical experts and discuss in good faith with the clear objective to resolve the
matter in an amicable and timely manner. Any costs related to the involvement of an external technical expert shall be borne equally by JSR and Styron unless the external technical expert comes to the conclusion that the damage to the Styron plant
equipment was entirely or predominately caused by the gel formation during the JSR Slot despite changing and cleaning polymer filters in accordance with the Agreed Procedure in which case JSR will bear the costs of the external technical expert
alone. 

  

	 	(f)	Styron shall use all reasonable endeavors to optimize the cleaning activity as efficiently as reasonably practicable; 

  

	 	(g)	if and to the extent any Unplanned Shutdown time is shared by the Parties in accordance with this Article 4.5, Styron shall give JSR reasonable explanation as to the causes and other reasonable information and provide
proof of such Unplanned Shutdown; and 

  
 Confidential 

 (h) 

(A) in order to verify the “clean” status of the New Train before a JSR Time Slot, Styron shall conduct an endoscope video
investigation of the batch reactor(s) of the New Train and show the video results to JSR prior to beginning of each JSR Time Slot. With respect to the third (3rd) JSR Time Slot in 2012, the endoscope video investigation will be made in three
(3) batch reactors. With respect to subsequent JSR Time Slots, one (1) batch reactor (and the other one (1) or two (2) batch reactor(s) as long as JSR so requires, acting reasonably) will be investigated. If one (1) batch
reactor is investigated, Styron shall bear the costs and time for such investigation. If an additional one (1) or two (2) batch reactor(s) are investigated according to JSR’s reasonable requests, JSR shall bear the costs and time for
such additional investigation. 
 (B) Notwithstanding the foregoing, if the batch reactor investigation(s) referred to above verify the
“clean” status of the New Train before the relevant JSR Slot(s) on three (3) consecutive occasions applying at each occasion the same cleaning procedure, including but not limited to hot solvent cleaning, then the “clean”
status of the New Train prior to a JSR Slot shall be deemed established for the purposes of this Article 4.5 and Styron shall be released going forward from the obligation to conduct and/or carry out any batch reactor investigations under and in the
context of this sub-paragraph (h), however, it being acknowledged and agreed that Styron will continue to apply the same cleaning procedure, including but not limited to hot solvent cleaning, of all batch reactors of the New Train prior to each JSR
Slot. 
 (C) Notwithstanding the preceding sub-paragraph (h)(B), if JSR, acting reasonably and by at least thirty (30) day prior notice
to Styron, so requires, Styron shall conduct an endoscope video investigation of as many batch reactors of the New Train as JSR may require and show the video results to JSR prior to beginning of the relevant JSR Time Slot. JSR acknowledges and
agrees that (i) any such request by JSR and the subsequent endoscope video investigation may delay the beginning of the relevant JSR Slot, and (ii) unless such investigation reveals that a batch reactor was not “clean” or
“clean enough”, JSR will not be compensated for any time lost in connection with the relevant inspection and is not entitled to claim any additional production time, whether following the JSR Slot directly concerned by the inspection or as
an addition to any future JSR Slot. JSR shall bear the full costs and time for such investigations according to such JSR’s requests. If, however, any such investigation reveals that any of the batch reactors is not “clean” or
“clean enough”, Styron shall bear the full costs and time for such investigations and the deemed “clean” status under sub-paragraph (h)(B) shall be deemed incorrect and the Parties shall revert to the practice established under
sub-paragraph (h)(A), up and until Styron is able to prove again the “clean” status of the New Train on three (3) consecutive occasions in accordance with sub-paragraph (h)(B) in which case the provisions of sub-paragraph (h)(B) shall
fully apply again. 
 (D) In the event that any endoscope investigation in accordance with this Article 4.5 (h) reveals that any batch
reactor is not “clean” or “clean enough”, Styron shall conduct complete cleaning of all batch reactor(s) that are not “clean” or “clean enough” prior to the beginning of the next JSR Time Slot. Styron shall
bear the full costs and time for such cleaning in accordance with this sub-paragraph (h)(D), it being acknowledged and agreed, for the avoidance of doubt, that no portion of such costs and time for such cleaning shall be charged to or shared by JSR.

  
 Confidential 

 (E) Notwithstanding sub-paragraph (h)(D), if JSR, acting reasonably and by notice to Styron at
least thirty (30) days prior to the scheduled start of a JSR Time Slot, so requires, Styron shall conduct complete cleaning of the batch reactors that are “clean” or “clean enough” as reasonably required by JSR, unless JSR,
judging reasonably from the results of the endoscope investigations, gives notice to Styron not to conduct all or part of such cleaning. JSR shall bear the full costs and time for the cleaning, whether carried out fully or partly, (including
cancellation fees for the cleaning arrangement if applicable) in accordance with this sub-paragraph (h)(E). 
  

	 	(i)	For the purposes of Article 4.5 (b), (e) and (h), “clean” or “clean enough” shall mean that a reactor is free of residuals of polymeric material on the reactor walls and/or the agitation system
with an approximate sum of all polymer deposits in one (1) batch reactor larger than 1m2 area and 5mm thickness. The definition of “clean” or “clean enough” agreed in this
Article 4.5 (i) may be revised by mutual agreement by the Parties taking into due consideration the actual operation situations of the New Train. 

  

	 	(j)	after the end of each JSR Time Slot, if JSR acting reasonably so requires, Styron shall conduct complete cleaning of the pre-reactor prior to the beginning of the next JSR Time Slot as reasonably required by JSR,
provided that JSR shall bear the full cost of such cleaning. 

 2.2 Article 4.9 shall be amended to include the following wording as a
separate paragraph at the end of it: 
 “Notwithstanding the foregoing, with respect to any Commercialized Grades the Parties will set
at the beginning of each JSR Time Slot the planned production volume for each Commercialized Grade in such JSR Time Slot as the target production volume of such Commercialized Grade (“Target Volume”). Provided the actual production volume
of a Commercialized Grade during the previous JSR Time Slot exceeds 90% of the Target Volume, then Styron is entitled to request from JSR and JSR is obliged to make a Bonus Payment to Styron. The amount of such Bonus Payment shall be 50 EUR for each
full 1 MT of surplus production volume above 90% of the Target Volume.” 
 3. Amendment to Article 5 – (Price and Invoicing) 

The FAP table in Article 5.3 shall be deleted and replaced with the following: 

[****] 

  
 Confidential 

 Example (for illustration purposes only): 

[****] 
 4. Amendment of Article 7 (Furnishing
of Raw Materials and Utilities) 
 4.1. The heading of Article 7 shall be amended to read as follows: 

“Furnishing of Raw Materials and Utilities, Planning, Butadiene Shortages”. 

The table of content on page 2 of the SSBR Agreement shall be updated accordingly. 

4.2 Article 7 shall be amended to include the following Articles 7.3, 7.4, 7.5 and 7.6 respectively: 

“7.3 The Parties agree that Styron will logistically handle the supply of Butadiene in connection with the Agreement (including potential
oversupply) [****]. 
 7.4 For each production period JSR will put together, and by no later than the 15th of the previous month, submit to Styron a good faith, best-estimate production forecast for the next following month (each a “JSR Forecast”) based on historical run rates per grade which
Styron shall use as baseline for the ordering of any raw material, including Butadiene. In case JSR does not supply this information at the required time, Styron will estimate the Butadiene and other raw material consumption of the relevant JSR
production run by applying average run rates of the [****] of the respective grades and order Butadiene (and other raw materials) for JSR in line with such estimate. Styron will inform JSR about the estimate within reasonable time and such estimate
shall be deemed the JSR Forecast for the respective month. 
 7.5 In the event of a shortage of Butadiene for whatever reason beyond
Styron’s reasonable control (each a “Shortage”) such Shortage [****] based on the relevant JSR Forecast and Styron’s respective rubber production planning for the time in question. Each of the Parties therefore acknowledges and
agrees that in the event of a Shortage: (i) Styron will [****]; (ii) no Unplanned Shutdown time shall be [****] if the reduced target production of the production period is met during the respective Shortage; and (iii) certain daily
run rate adjustments of trains might be 

  
 Confidential 

 
necessary due to delivery plan and actual delivery time changes. For avoidance of doubt capacity and production losses due to Shortages cannot be recovered by later runs and will not lead to
additional production time for either Party. 
 Example (for illustration purposes only) 

If only [****] of the ordered Butadiene can be delivered in a particular [****] period for reason beyond Styron’s reasonable control and
such [****] period falls within a JSR Time Slot, the New Train Butadiene consumption in JSR Time Slot will be [****]. 
  

	 	7.6	     

  

	 	7.6.1	[****] 

  

	 	7.6.2	JSR shall inform Styron promptly if it is unwilling to buy the [****] Butadiene at [****] but in any event prior to Styron making the respective purchases. In this case Styron will operate the New Train on the basis of
a [****]. 

 5. Amendment of Article 9 (Quality) 

5.1 The heading of Article 9 shall be amended to read as follows: 

“Commercialized Grades and Quality”. 

The table of content on page 2 of the SSBR Agreement shall be updated accordingly. 

 

	5.2	The Parties agree to insert at the end of Article 9.1 the following independent paragraphs: 

“The Parties agree to use all their respective reasonable efforts to mature HP755D into Commercialized Grades in accordance with the terms
of this Agreement in 2012. 
 Notwithstanding the foregoing and anything to the contrary in this Article 9, the Parties acknowledge and
agree: 
  

	 	(a)	 to specify detailed definitions of key performance indicators for stable manufacturing conditions required to specify a grade as
“commercialized” for the purposes of this Agreement. Such indicators will include certain requirements for specification limits, control limits, recipes, and actual values need to be close to center of specifications (as

  
 Confidential 

	 	
indicated by CpK, and alike). Process capability indicators will include the technological capability of the plant and the analytical capability of the methods used. The Operating Committee and
Technical Committee shall work on the specific details; 

  

	 	(b)	[****] 

  

	 	(c)	[****] 

  

	 	(d)	that stable conditions and quality should always have priority over run rate. Any quality changes derived from the nature of the products after release (for instance, Mooney jump), shall not be part of the quality
assessment under this Article 9 or any other term of this Agreement.” 

 5.3 Article 9 shall be amended to include the following Article
9.15: 
 “9.15 Before Commercialization of a Grade, Styron will, upon request by JSR, supply any of the information referenced to be
available at this stage in the Appendix A to the “AGREEMENT (No. 1) on JOBS and FUNCTION of EMPLOYEE ENGAGED in PRODUCTION of JSR’s PRODUCTS at the SCHKOPAU PLANT” between Styron and JSR effective as from 1 April 2011
(“Engineer Agreement”), in accordance with the agreed principles stipulated in the Engineer Agreement. In addition, Styron will grant and admit JSR’s personnel reasonable access to and presence in the finishing line of the New Train
during any JSR Time Slot, such access and presence to be during normal working hours and upon mutual agreement of the Parties, acting reasonably. The Parties acknowledge and agree for the purposes of execution, delivery and performance of the this
Agreement and Engineer Agreement that information disclosure by Styron to JSR and JSR’s personnel’s presence in the production site during any JSR Time Slots for the purposes of solving quality problems, improving product quality and
productivity and prime rate and ascertaining the stable operation during JSR Time Slots can be construed differently for the purposes of applicable anti-trust law: on the one hand, the sharing of certain sensitive information and data between
parties, in particular competitors, is per se regarded as highly problematic for anti-trust law purposes and the burden of proof that this sharing is not contrary to the provisions of Art. 101 (1) of the Treaty on the Functioning of the
European Union (as amended) would be upon the Parties; on the other hand, the sharing could be considered as pro-competitive in light of competition law in that such information disclosure and the presence of JSR personnel will enable Styron to
produce, and JSR to sell, more volumes of products of better quality and effectively promote the competition in the S-SBR product market. In the light of the above, the Parties agree to assess the disclosure and presence of JSR personnel on a case
by case basis based on an appropriate antitrust analysis. In the absence of an agreement between them, notwithstanding any good faith effort on both parts, each party shall be free to involve an agreed antitrust specialist to assist resolving the
matter. The party whose opinion turns out to be incorrect shall bear the costs of said specialist; otherwise the Parties shall share the costs jointly.” 

  
 Confidential 

 6. Amendment of Article 15 (Payment Terms) 

Article 15.1 of the SSBR Agreement shall be deleted in its entirety and be replaced with the following paragraph; 

 

	 	“15.1	     

 [****].” 

7. Amendment of Schedule 2 (Fixed Annual Payment (FAP) Included Items) 

Paragraph 2.1 of Schedule 2 shall be amended by: 
 (1) deleting
the fifth (5th) bullet point “Waste water treatment” from the third major bullet point “Site and infra-structure service”; and 

(2) adding as a new major bullet point at the end of this Paragraph 2.1, such new bullet point being the fourth major bullet point under this Paragraph:
[****] 
 8. Amendment of Schedule 3 (Variable Payment to cover Costs of Raw Materials, Energy, Utilities and Services) 

The table contained in Schedule 3 shall be deleted in its entirety and be replaced with the following: 

 

			
	 Cost item
	  	 Payment Formula

	Butadiene Monomer (BD)	  	[****]
		
	Styrene Monomer (SM)	  	[****]

  
 Confidential 

			
	Process and Polymerization Chemicals (including: oils, chemicals catalyst, stabilizers, inhibitors, process aids and other chemicals)	  	[****]
		
	Cooling Tower Water (CTW)	  	[****]
		
	 Compressed Air, Water (boiler-Feed-Water, River Water, Drinking Water)
	  	[****]
		
	 Nitrogen
	  	[****]
		
	 Natural Gas
	  	[****]
		
	 Power
	  	[****]
		
	 Steam
	  	[****]
		
	 Process Coolants other than CTW
	  	[****]
		
	 Solid and Liquid Disposal
	  	[****]
		
	 Waste Water
	  	[****]
		
	 Packaging, Site Logistics and Supply Chain Services
	  	[****]
		
	 Maintenance, Cleaning and other services (if not included in FAP)
	  	[****]
		
	 Process Oil
	  	[****]

  
 Confidential 

 9. General 

9.1 As modified by this Amendment the SSBR Agreement shall remain in full force and effect in accordance with its terms. 

9.2 The amendments contained in Paragraph 3, 4 and 7 shall become effective on and be effective as of April 1, 2012, the rest of the amendments shall
become effective as from the date of execution of this Amendment. 
 9.3 If any provision of this Amendment is unenforceable, invalid or prohibited by any
applicable law of treaty or court of competent jurisdiction, that provision will be severed and inoperative and the remaining provisions will be valid and binding. The Amendment will be amended to include provisions which, not being void or
unenforceable, most nearly achieve the object of the allegedly void or unenforceable provision. 
 9.4 This Amendment may be executed in counterparts, each
of which shall be deemed an original, but all of which together shall constitute one and the same instrument. 
 IN WITNESS WHEREOF, the parties hereto have
caused this Amendment to be executed in duplicate by their duly authorized officers or representatives. 
  

									
	Styron Europe GMBH	 		 	 JSR Corporation Tokyo
Wallisellen Branch

					
	By:	 	

	 		 	By:	 	

	Name:	 	Marco Levi	 		 	Name:	 	Kazushi Abe
	Title:	 	VP Emulsion Polymers	 		 	Title:	 	Branch Manager

  
 ConfidentialEX-10.34

 Exhibit 10.34 

EXECUTION COPY 
 SIXTH AMENDMENT
TO CREDIT AGREEMENT 
 SIXTH AMENDMENT TO CREDIT AGREEMENT, dated as of December 3, 2013 (this “Sixth Amendment”),
among TRINSEO MATERIALS OPERATING S.C.A. (formerly known as STYRON S.À R.L. and TRINSEO MATERIALS OPERATING S.À R.L.), a corporate partnership limited by shares (société en commandite par actions) organized under
the laws of Luxembourg (the “Borrower”) and each Lender (as defined below) party hereto. 
 W I T N E S S E T H: 

WHEREAS, the Borrower, the Administrative Agent, the Collateral Agent, the Guarantors party thereto from time to time and each lender from
time to time party thereto (the “Lenders”) have entered into a Credit Agreement, dated as of June 17, 2010 (as amended by that certain First Amendment dated as of February 2, 2011, that certain Second Amendment dated as of July 28,
2011, that certain Third Amendment dated as of February 13, 2012, that certain Fourth Amendment dated as of August 9, 2012 and that certain Fifth Amendment dated as of January 29, 2013, the “Credit Agreement”) (capitalized terms not
otherwise defined in this Sixth Amendment have the same meanings as specified in the Credit Agreement); 
 WHEREAS, the Borrower desires to
obtain the consent (the “Release Consent”) of the Required Lenders to release the Guaranty of STYRON ITALIA S.R.L., a company organized under the laws of Italy (the “Italian Guarantor”), on the terms and conditions
set forth in Section 1 below; 
 WHEREAS, pursuant to Section 10.01 of the Credit Agreement, the consent of the Required
Lenders is necessary to effect the Release Consent; 
 WHEREAS, the Lenders party hereto will constitute the Required Lenders; 

NOW, THEREFORE, in consideration of the premises and for other good and valuable consideration, the sufficiency and receipt of all of which is
hereby acknowledged, the parties hereto hereby agree as follows: 
 SECTION 1. Release Consent. Subject to the satisfaction or waiver
of the conditions set forth in Section 2 hereof, the Lenders hereby (x) consent to the release of the Italian Guarantor from all of its obligations under the Guaranty and the Collateral Documents to which it is a party and (y) authorize and
direct the Administrative Agent and the Collateral Agent, as applicable, to (at the Borrower’s expense) execute and deliver to the Italian Guarantor such documents as the Borrower may reasonably request to evidence the release of Collateral
from the assignment and security interest granted by the Italian Guarantor under the Collateral Documents to secure its obligations under the Guaranty, or to evidence the release of the Italian Guarantor from its obligations under the Guaranty. The
Lenders hereby consent to the filing of a UCC-3 Financing Statement, substantially in the form attached as Exhibit A, with the Recorder of Deeds of the District of Columbia to terminate UCC Financing Statement No. 2011097575, filed with the Recorder
of Deeds of the District of Columbia. 
 SECTION 2. Conditions of Effectiveness of the Release Consent. This Sixth Amendment shall
become effective on the date when the following conditions have been satisfied or waived by the Administrative Agent (such date the “Sixth Amendment Effective Date”): (x) the Administrative Agent shall have received the duly
executed signature page from the Required Lenders and the Borrower; (y) the Italian Guarantor shall be released from any guaranty provided by it in favor of the holders of the 2013 Senior Secured Notes (which condition may be satisfied automatically
in accordance with the governing documents for the 2013 Senior Secured Notes upon the satisfaction of the 

  
 NEWYORK 9054556 (2K) 

 
other conditions hereto) and (z) the Borrower shall have paid in full all fees and reasonable out-of-pocket expenses (i) incurred by the Administrative Agent in connection with the preparation,
negotiation and execution of this Sixth Amendment required to be paid in connection with this Sixth Amendment and (ii) of counsel to the Administrative Agent (including Attorneys Costs of White & Case LLP) in connection with this Sixth
Amendment, the Credit Agreement and the other Loan Documents, in each case to the extent invoiced on or prior to the date otherwise constituting the Sixth Amendment Effective Date. 

SECTION 3. Release of Claims. In consideration of the agreements contained in this Agreement, the Borrower (on behalf of itself and
each of its subsidiaries) hereby irrevocably releases and forever discharge the Lenders, the Administrative Agent and the Collateral Agent and their respective affiliates, subsidiaries, successors, assigns, directors, officers, employees, agents,
consultants and attorneys (each, a “Released Person”) of and from any and all claims, suits, actions, investigations, proceedings or demands, whether based in contract, tort, implied or express warranty, strict liability, criminal
or civil statute or common law of any kind or character, known or unknown, which the Italian Guarantor, its agents, officers or directors ever had or now has against the Administrative Agent, the Collateral Agent any Lender or any other Released
Person which relates, directly or indirectly, to any acts or omissions of the Collateral Agent, the Administrative Agent, any Lender or any other Released Person relating to the Credit Agreement or any other Loan Document on or prior to the Sixth
Amendment Effective Date. 
 SECTION 4. Representations and Warranties. The Borrower (on behalf of each of the Loan Parties)
represents and warrants as follows as of the date hereof and as of the Sixth Amendment Effective Date: 
 (a) The execution, delivery and
performance by each Loan Party party hereto of this Sixth Amendment are within such Loan Party’s corporate or other powers and have been duly authorized by all necessary corporate or other organizational action. Neither the execution, delivery
and performance by each Loan Party party hereto of this Sixth Amendment will (a) contravene the terms of such Person’s Organization Documents, (b) conflict with or result in any breach or contravention of, or the creation of any Lien upon any
of the property or assets of the Borrower or any of the Restricted Subsidiaries (other than as permitted by Section 7.01 of the Credit Agreement), or require any payment under (i) any Contractual Obligation to which such Person is a party or
affecting such Person or the properties of such Person or any of its Restricted Subsidiaries or (ii) any material order, injunction, writ or decree of any Governmental Authority or any arbitral award to which such Person or its property is subject;
or (c) violate any applicable material Law, except to the extent that any such breach, contravention or payment (but not the creation of any Lien) referred to in clause (b)(i) could not, individually or in the aggregate, reasonably be expected to
have a Material Adverse Effect. 
 (b) This Sixth Amendment has been duly executed and delivered by each Loan Party that is a party hereto
and constitutes a legal, valid and binding obligation of each Loan Party that is a party hereto or thereto, enforceable against such Loan Party in accordance with its terms, except as such enforceability may be limited by Debtor Relief Laws and by
general principles of equity. 
 (c) Upon the effectiveness of each and all parts of this Sixth Amendment, and both before and immediately
after giving effect to each and all parts of this Sixth Amendment, no Default or Event of Default exists. 
 (d) Each of the representations
and warranties of the Borrower and each other Loan Party contained in Article V of the Credit Agreement and each other Loan Document immediately before and after giving effect to each and all parts of this Sixth Amendment is true and correct in all
material respects on and as of the date hereof; provided that, to the extent that such representations and warranties specifically refer to an earlier date, they are true and correct in all material respects as of such earlier date. 

  
 2 

NEWYORK 9054556 (2K) 

 SECTION 5. Reference to and Effect on the Credit Agreement and the Loan Documents. 

(a) On and after the Sixth Amendment Effective Date, each reference in the Credit Agreement to “this Agreement,”
“hereunder,” “hereof” or words of like import referring to the Credit Agreement shall mean and be a reference to the Credit Agreement, as amended by this Sixth Amendment. 

(b) The Credit Agreement and each of the other Loan Documents, as specifically amended by each and all parts of this Sixth Amendment, are and
shall continue to be in full force and effect and are hereby in all respects ratified and confirmed. Without limiting the generality of the foregoing, the Collateral Documents and all of the Collateral described therein do and shall continue to
secure the payment of all Obligations of the Loan Parties under the Loan Documents, in each case, as amended by this Sixth Amendment. 
 (c)
The execution, delivery and effectiveness of any part of this Sixth Amendment shall not, except as expressly provided herein, operate as a waiver of any right, power or remedy of any Lender or the Administrative Agent under any of the Loan
Documents, nor constitute a waiver of any provision of any of the Loan Documents. On and after the effectiveness of any part of this Sixth Amendment, this Sixth Amendment shall for all purposes constitute a Loan Document. 

SECTION 6. Execution in Counterparts. This Sixth Amendment may be executed in one or more counterparts, each of which shall be deemed
an original, but all of which together shall constitute one and the same instrument. Delivery by facsimile or electronic transmission of an executed counterpart of a signature page to this Sixth Amendment shall be effective as delivery of an
original executed counterpart of this Sixth Amendment. 
 SECTION 7. Governing Law. This Sixth Amendment shall be governed by, and
construed in accordance with, the law of the State of New York. 
 [The remainder of this page is intentionally left blank]

  
 3 

NEWYORK 9054556 (2K) 

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

			
	TRINSEO MATERIALS OPERATING S.C.A.,
	Acting through its general partner Trinseo Materials
	S.à r.l.
	as the Borrower
	
	a Société en commandite par actions
	Registered office: 4, rue Lou Hemmer,
	L-1748 Luxembourg-Findel, Luxembourg
	R.C.S. Luxembourg: B 153.586
		 	
	By:	 	 /s/ Christopher D. Pappas

		 	Name: Christopher D. Pappas
		 	Title: Manager
		 	
		 	

 [Signature Page to Sixth Amendment to Credit Agreement) 

 
					
	SIGNATURE PAGE TO THE SIXTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG TRINSEO MATERIALS OPERATING S.C.A., STYRON ITALIA S.R.L, AND THE OTHER LENDERS PARTY THERETO
	
	 DEUTSCHE BANK AG NEW YORK BRANCH,

as a Lender:

		
	By:	 	 /s/ Michael Getz

		 	Name:	 	Michael Getz
		 	Title:	 	Vice President
		
	By:	 	 /s/ Marcus M. Tarkington

		 	Name:	 	Marcus M. Tarkington
		 	Title:	 	Director

 [Signature Page to Sixth Amendment to Credit Agreement] 

 
					
	SIGNATURE PAGE TO THE SIXTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG TRINSEO MATERIALS OPERATING S.C.A., STYRON ITALIA S.R.L, AND THE OTHER LENDERS PARTY THERETO
	
	 BARCLAYS BANK PLC,
 as a
Lender:

		
	By:	 	 /s/ Vanessa A. Kurbatskiy

		 	Name:	 	Vanessa A. Kurbatskiy
		 	Title:	 	Vice President

 [Signature Page to Sixth Amendment to Credit Agreement] 

 
					
	SIGNATURE PAGE TO THE SIXTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG TRINSEO MATERIALS OPERATING S.C.A., STYRON ITALIA S.R.L, AND THE OTHER LENDERS PARTY THERETO
	
	 BANK OF MONTREAL,
 as a
Lender:

		
	By:	 	 /s/ Katherine K. Robinson

		 	Name:	 	Katherine K. Robinson
		 	Title:	 	Vice President

 [Signature Page to Sixth Amendment to Credit Agreement] 

 
			
	SIGNATURE PAGE TO THE SIXTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG TRINSEO MATERIALS OPERATING S.C.A., STYRON ITALIA S.R.L, AND THE OTHER LENDERS PARTY THERETO
	
	 Goldman Sachs Bank USA, 
 as a
Lender:

		
	By:	 	 /s/ Michelle Latzoni

		 	Name: Michelle Latzoni
		 	Title: Authorized Signatory

  

			
	By:	 	  

		 	Name:
		 	Title:

 [Signature Page to Sixth Amendment to Credit Agreement] 

 
			
	SIGNATURE PAGE TO THE SIXTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG TRINSEO MATERIALS OPERATING S.C.A., STYRON ITALIA S.R.L, AND THE OTHER LENDERS PARTY THERETO 
	
	 HSBC Bank USA, National Association,

as a Lender:

		
	By:	 	 /s/ David A. Mandell

		 	Name: David A. Mandell
		 	Title: Managing Director

 [Signature Page to Sixth Amendment to Credit Agreement] 

			
	SIGNATURE PAGE TO THE SIXTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG TRINSEO MATERIALS OPERATING S.C.A., STYRON ITALIA S.R.L, AND THE OTHER LENDERS PARTY THERETO
	
	 Mizuho Bank, Ltd.,
 as a
Lender:

		
	By:	 	/s/ James Fayen
		 	Name: James Fayen
		 	Title: Deputy General Manager

 [Signature Page to Sixth Amendment to Credit Agreement] 

 
			
	SIGNATURE PAGE TO THE SIXTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG TRINSEO MATERIALS OPERATING S.C.A., STYRON ITALIA S.R.L, AND THE OTHER LENDERS PARTY THERETO
	
	 Sumitomo Mitsui Banking Corporation,

as a Lender:

		
	By:	 	 /s/ Shuji Yabe

		 	Name: Shuji Yabe
		 	Title: Managing Director

 [Signature Page to Sixth Amendment to Credit Agreement] 

 Exhibit A to 

Sixth Amendment to Credit Agreement 

Form of UCC-3 Financing Statement 

[see attached] 

	
	     

	 
	 
	 
	 
	 
	     

 UCC FINANCING STATEMENT AMENDMENT 

FOLLOW INSTRUCTIONS (front and back) CAREFULLY

A. NAME & PHONE OF CONTACT AT FILER [optional] 
  

 
 B. SEND ACKNOWLEDGMENT TO: (Name
and Address) 
  

									
		  	    	  		  	    	 	
		  		  		  		 	
		  		  		  		 	
		  		  		  		 	
		  		  		  		 	
		  		  		  		 	
		  	 	  		  	 	 	

 

  
  

 
  
  

THE ABOVE SPACE IS FOR FILING OFFICE USE ONLY

 

			
	 1a. INITIAL FINANCING STATEMENT FILE#
	  	
1b.   This FINANCING STATEMENT AMENDMENT is

         to be filed [for record] (or recorded) in the

 ̈     
 REAL ESTATE RECORDS.

	  2011097575 filed on September 23, 2011	  

	2. þ	TERMINATION: Effectiveness of the Financing Statement identified above is terminated with respect to security interest(s) of the secured Party authorizing this Termination Statement. 

 

	3.  ̈	CONTINUATION: Effectiveness of the Financing Statement identified above with respect to security interest(s) of the Secured Party authorizing this Continuation Statement is continued for the additional period provided
by applicable law. 

  

	4.  ̈	ASSIGNMENT (full of partial): Give name of assignee in item 7a or 7b and address of assignee in item 7c; and also give name of assignor in item 9. 

 

	5.	AMENDMENT (PARTY INFORMATION): This Amendment affects  ̈ Debtor or
 ̈ Secured Party of record.  Check only one of these two boxes. 

Also check one of the following three boxes and provide appropriate information in item 6 and/or 7. 

 

											
		 	  ̈ CHANGE name
and/or address: Please refer to the detailed instruction in regards to changing the name/address of a party.
	 		 	  ̈ DELETE name: Give
record name to be deleted in  item 6a or 6b.
	 		 	  ̈ ADD name:
Complete item 7a or 7b, and also item  7c; also complete 7e-7g (if applicable).

  

	6.	CURRENT RECORD INFORMATION: 

									
	 OR
	 	 6a. ORGANIZATION’S NAME

 
	 	 	 	 	 	 
	 	 6b. INDIVIDUAL’S LAST NAME

 
	 	FIRST NAME	 	MIDDLE NAME	 	SUFFIX

	7.	CHANGED (NEW) OR ADDED INFORMATION: 

													
	 OR        
	 	 7a. ORGANIZATION’S NAME

 
	 	 
	 	 7b.
INDIVIDUAL’S LAST NAME
  
	 	FIRST NAME	 	MIDDLE NAME	 	SUFFIX
	7c. MAILING ADDRESS	 	 	 	 CITY
  
	 	STATE	 	POSTAL CODE  	 	COUNTRY
	 7d. SEE INSTRUCTIONS

 
	 	 ADD’L INFO RE  |  7e. TYPE OF
ORGANIZATION
 ORGANIZATION

DEBTOR               |  
	 	7f. JURISDICTION OF ORGANIZATION	 	7g. ORGANIZATIONAL ID #, if any	 	  
  ̈NONE

	8.	AMENDMENT (COLLATERAL CHANGE): check only one box. 

   Describe collateral  ̈ deleted or  ̈ added, or give entire
 ̈ restated collateral description, or describe collateral  ̈ assigned. 

 
  
  

 
 

	9.	NAME OF SECURED PARTY OF RECORD AUTHORIZING THIS AMENDMENT (name of assignor, if this is an Assignment). If this is an Amendment authorized by a Debtor which adds collateral or adds the
authorizing Debtor, or if this is a Termination authorized by a Debtor, check here  ̈ and enter name of DEBTOR authorizing this Amendment. 

									
	 OR
	 	 9a. ORGANIZATION’S NAME

Deutsche Bank AG New York Branch, as Collateral Agent

	 	 	 9b. INDIVIDUAL’S LAST NAME

 
	 	FIRST NAME	 	MIDDLE NAME	 	SUFFIX

	10.	OPTIONAL FILER REFERENCE DATA 

   Styron Italia
s.r.l.                                        
                    FILE WITH WASHINGTON, DC 

 
 FILING OFFICE COPY — UCC FINANCING
STATEMENT AMENDMENT (FORM UCC3) (REV. 05/22/02)

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