Provided are a rubber composition achieving balanced improvement in processability, fuel economy, rubber strength, abrasion resistance, wet-grip performance, and handling stability, and a pneumatic tire including the composition. The rubber composition includes, per 100% by mass of a rubber component, at least 35% by mass of SR, the composition including a conjugated diene polymer and a silica having N2SA of 40-400 m2/g, the polymer being obtained by polymerizing a monomer component including a conjugated diene compound and a silicon-containing vinyl compound using a polymerization initiator of formula (I):
to produce a copolymer, and reacting a compound containing nitrogen and/or silicon atoms with an active terminal of the copolymer, wherein the amount of the diene polymer is 1-90% by mass and the amount of polyisoprene-based rubber is 0-40% by mass, each per 100% by mass of the rubber component, and the amount of the silica is 10-150 parts by mass per 100 parts by mass of the rubber component.
本发明提供了一种橡胶组合物,可均衡地改善加工性能、燃油经济性、橡胶强度、耐磨性、湿抓性能和操控稳定性,以及一种包含该组合物的充气轮胎。该橡胶组合物包括每 100% 质量的橡胶成分中至少 35% 质量的 SR,该组合物包括共轭二烯聚合物和 N2
SA 为 40-400 m2/g 的
白炭黑,该聚合物是通过使用式(I)的聚合
引发剂聚合包括共轭二烯化合物和含
硅乙烯基化合物的单体成分而获得的:
生成共聚物,并使含氮和/或
硅原子的化合物与共聚物的活性末端反应,其中二烯聚合物的用量为 1-90%(质量百分比),聚
异戊二烯基橡胶的用量为 0-40%(质量百分比)(各占橡胶组分 100%的质量百分比),
白炭黑的用量为 10-150(质量百分比)(各占橡胶组分 100%的质量百分比)。