Rubber composition for tire tread

摘要

A tread rubber composition is provided which includes 100 parts by weight of a diene rubber containing as a main component thereof at least one rubber selected from the group consisting of natural rubber, polyisoprene and polybutadiene, and 30 to 90 parts by weight of a vulcanized rubber powder, wherein the vulcanized rubber powder is a powder of a rubber resulting from the vulcanization of a rubber composition including 100 parts by weight of a diene rubber containing as a main component thereof at least one rubber selected from the group consisting of natural rubber, polyisoprene and polybutadiene, and 30 to 100 parts by weight of a clay mainly composed of kaolinite. The rubber composition for tire tread assures improved braking performance with the fracture resistance thereof kept satisfactory and, hence, a tire tread made of such rubber composition makes it possible to build a studless tire exhibiting an improved gripping force.