Patent ID: 6355728
Filing Date: 2002-03-12
Classification: B60C,C08F,C08K,C08L,Y10S

Abstract:
A rubber composition for a tire comprising:(1) an incompatible polymer blend composed of at least two rubbers selected from the group consisting of: natural rubber (NR), synthetic isoprene rubber (IR), polybutadiene rubber (BR), and styrene-butadiene copolymer rubber (SBR) wherein two polymer phases Xâ€² and Yâ€² are formed; and (2) 0.1-20 parts by weight, based on a total 100 parts by weight of the total rubber components including the block copolymer, of a block copolymer composed of monomers selected from the group consisting of isoprene, butadiene, and styrene, the block copolymer having at least two mutually incompatible blocks Aâ€² and Bâ€², wherein, the block Aâ€² is compatible with the polymer phase Xâ€² and incompatible with the polymer phase Yâ€², the block Bâ€² is incompatible with the polymer phase Yâ€² and compatible with the polymer phase Xâ€², the block copolymer contains an amount of 1,4-bonds of at least 50,000 weight average molecular weight, and the ratio of 1,4-bonds, in blocks Aâ€² to Bâ€² is 0.67 to 1.50.