申请人:Sumitomo Rubber Industries, Ltd.
公开号:EP2749594A1
公开(公告)日:2014-07-02
Provided are a rubber composition capable of achieving a balanced improvement in performance on ice and snow, fuel economy, abrasion resistance, rubber strength, wet-grip performance, and dry handling stability, and a studless winter tire including the rubber composition. The present invention relates to a rubber composition including a specific conjugated diene polymer obtained by using a polymerization initiator represented by the formula (I) below, a high-cis polybutadiene having a cis microstructure content of not less than 95% by mass, a polyisoprene-based rubber, and a silica having a N2SA of 40-400 m2/g, wherein the rubber composition includes, based on 100% by mass of a rubber component, 1-45% by mass of the conjugated diene polymer, 20-64% by mass of the high-cis polybutadiene, and 35-60% by mass of the polyisoprene-based rubber, and the rubber composition includes 5-150 parts by mass of the silica for each 100 parts by mass of the rubber component.
本发明提供了一种能够均衡改善冰雪路面性能、燃油经济性、耐磨性、橡胶强度、湿抓地性能和干操控稳定性的橡胶组合物,以及一种包括该橡胶组合物的无钉冬季轮胎。本发明涉及一种橡胶组合物,包括通过使用下式(I)代表的聚合引发剂获得的特定共轭二烯聚合物、顺式微结构含量不低于 95% (按质量计)的高顺式聚丁二烯、聚异戊二烯基橡胶和 N2SA 为 40-400 m2/g 的白炭黑、其中,橡胶组合物包括(以橡胶组分的质量百分比为 100%)共轭二烯聚合物 1-45%(质量百分比)、高顺式聚丁二烯 20-64%(质量百分比)和聚异戊二烯基橡胶 35-60%(质量百分比),并且橡胶组合物包括每 100 份橡胶组分中含 5-150 份白炭黑(质量百分比)。