A rubber composition from which a vulcanized rubber suitable for producing, for example, a pneumatic tire having excellent abrasion resistance, breaking strength, rolling resistance, wet skid resistance, and the like can be prepared. The rubber composition comprises a rubber component (A) comprising a diene rubber comprising 20 mass % or more of a modified styrene-butadiene copolymer (a1) and 5 mass % or more of a modified conjugated diene polymer (b1), and a filler (B), wherein the modified conjugated diene polymer (b1) is a conjugated diene polymer obtained by modifying the active terminals of a conjugated diene polymer having a cis-1,4 bond content of 80% or higher, with an alkoxysilane compound, and the filler (B) comprises at least either of 2 to 100 mass parts, relative to 100 mass parts of the rubber component (A), of carbon black (b1) and 30 to 100 mass parts, relative to 100 mass parts of the rubber component (A), of silica (b2).
一种橡胶组合物,由其制备的
硫化橡胶适用于生产例如具有优异耐磨性、断裂强度、滚动阻力、湿滑阻力等性能的充气轮胎。该橡胶组合物由橡胶组分(A)和填料(B)组成,橡胶组分(A)包括由 20% 或更多的改性
苯乙烯-
丁二烯共聚物(a1)和 5% 或更多的改性共轭二烯聚合物(b1)组成的二烯橡胶,其中改性共轭二烯聚合物(b1)是通过改性共轭二烯聚合物的活性端而获得的共轭二烯聚合物,其顺式-1、其中,改性共轭二烯聚合物 (b1) 是通过用烷氧基
硅烷化合物改性具有 80% 或更高顺式-1, 4 键含量的共轭二烯聚合物的活性末端而获得的共轭二烯聚合物,而填料 (B) 至少包括 2 至 100 质量份(相对于 100 质量份的橡胶组分 (A) 而言)的
炭黑 (b1) 和 30 至 100 质量份(相对于 100 质量份的橡胶组分 (A) 而言)的
白炭黑 (b2) 中的任一种。