Rubber composition for tire tread

摘要

PCT No. PCT/JP85/00217 Sec. 371 Date Dec. 17, 1985 Sec. 102(e) Date Dec. 17, 1985 PCT Filed Apr. 18, 1985 PCT Pub. No. WO85/04888 PCT Pub. Date Nov. 7, 1985.A tire tread rubber composition which is improved in grip characteristic, steering stability characteristics and low-temperature characteristics, containing 15 to 50 parts by weight of a particular styrene-butadiene rubber obtained by solution polymerization containing polymer chains modified with trifunctional and/or tetrafunctional coupling agents, 50 to 85 parts by weight of at least one rubber selected from the group consisting of emulsion-polymerized styrene-butadiene rubber, natural rubber, synthetic polyisoprene rubber and butadiene rubber, at least one compound as plasticizer selected from the group consisting of a sebacic acid ester, an adipic acid ester and a fatty acid ester, and carbon black having an average particle size of not more than 30 m mu .