Rubber composition for tire tread

摘要

A rubber composition for a tire tread contains styrene-butadiene rubber in a compounding amount of 100 parts by weight, silica in a compounding amount of 90 to 170 parts by weight, and an aromatic modified terpene resin in a compounding amount of 10 to 30 parts by weight. The styrene-butadiene rubber contains 40 to 100% by weight of solution-polymerized styrene-butadiene rubber (S-SBR1) and 60 to 0% by weight of solution-polymerized styrene-butadiene rubber (S-SBR2), the total content thereof being 100% by weight. The S-SBR1 has a styrene content of 30 to 38% by weight and a vinyl content of 60 to 80% by weight, the total content thereof being 100% by weight, a glass transition temperature of −20 to −5° C., and a weight average molecular weight of 1,000,000 to 1,800,000.

主权项

1. A tire tread composition comprising:
100 parts by weight of rubber compounds, 90 to 170 parts by weight of silica, and 10 to 30 parts by weight of an aromatic modified terpene resin, wherein all of the rubber compounds in said tire tread composition consist of 40 to 100% by weight of solution-polymerized styrene-butadiene rubber (S-SBR1) and 60 to 0% by weight of solution-polymerized styrene-butadiene rubber (S-SBR2), the total content thereof being 100% by weight, the S-SBR1 has a styrene content of 30 to 38% by weight and a vinyl content of 60 to 80% by weight, the total content thereof being 100% by weight, a glass transition temperature of −20 to −5° C., and a weight average molecular weight of 1,000,000 to 1,800,000, and the S-SBR2 has a glass transition temperature of −30° C. or higher and lower than −20° C., and a weight average molecular weight of 1,000,000 to 1,800,000.