Improvement of stability of dynamic performance of pneumatic tire tread composition, by adding at least one of some esters such as phosphoric acid ester, fatty acid ester in a definite ratio to the known composition comprising styrene-rich SBR added with a processing oil and carbon black respectively...http://www.google.com.au/patents/US4616685?utm_source=gb-gplus-sharePatent US4616685 - Pneumatic tire tread of stable dynamic performance
