AMENDMENT NUMBER ELEVEN (#12) TO ISPRENE SALES CONTRACT

Exhibit 10.97

AMENDMENT NUMBER ELEVEN (#12) TO ISPRENE SALES CONTRACT

This Amendment (“Amendment”) Number Twelve (#12) is entered into and effective this 11^th day of December 2009, by and between Shell Chemical LP (“Seller”) and Kraton Polymers U.S. LLC, f/k/a Shell Elastomers LLC (“Buyer”). Seller and Buyer may be referred to herein individually as a “Party” and collectively as the “Parties.”

WITNESSETH:

WHEREAS, Seller and Buyer are parties to that certain Sales Contract dated September 11, 1999, as amended, (“Contract”) pursuant to which Seller sells isoprene to Buyer; and

WHEREAS, Seller and Buyer desire to amend the Contract as provided herein;

NOW THEREFORE, in consideration of the mutual covenants and agreements set forth herein, and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties, intending to be legally bound, agree as follows:

1. Article 3, PERIOD, of the Contract shall be amended and restated in its entirety to read as follows:

IN WITNESS WHEREOF, the Parties have caused this Amendment to be executed by their duly authorized representatives as of the date first written above.

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