**EXHIBIT 31.1**

**CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER**

**PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002**

I, Kevin M. Fogarty, certify that: 

1. I have reviewed this quarterly report on Form 10-Q of Kraton Performance Polymers, Inc. and Kraton Polymers LLC; 

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessaryto make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in allmaterial respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 

4. The registrants’ other certifying officer and I are responsible for establishing and maintaining disclosure controls andprocedures (as defined in Exchange Act Rules 13a-15 (e) and 15d-15 (e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrants and have: 

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designedunder our supervision, to ensure that material information relating to the registrants, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is beingprepared; 

(b) Designed such internal control over financial reporting, or caused such internal control overfinancial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally acceptedaccounting principles; 

(c) Evaluated the effectiveness of the registrants’ disclosure controls andprocedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and 

(d) Disclosed in this report any change in the registrants’ internal control over financial reporting that occurredduring the registrants’ most recent fiscal quarter (the registrants’ fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrants’ internal controlover financial reporting; and 

5. The registrants’ other certifying officer and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to the registrants’ auditors and the audit committee of the registrants’ boards of directors (or persons performing the equivalent function): 

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financialreporting which are reasonably likely to adversely affect the registrants’ ability to record, process, summarize and report financial information; and 

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in theregistrants’ internal control over financial reporting. 

Date: May 5, 2010