Object:
Provided is a rubber composition with which low heat build-up is enhanced to or beyond conventional levels while wear resistance is ensured.
Solution means:
The rubber composition contains a diene rubber containing a styrene-butadiene copolymer component formed from at least one type of styrene-butadiene copolymers, and a reinforcing filler; the styrene-butadiene copolymer component formed from at least one type of styrene-butadiene copolymers satisfying that: (1) a bonded styrene content being from 5 to 50 wt.%; (2) a total of styrene content of an ozone-decomposed component S1 having one styrene-derived unit and styrene content of an ozone-decomposed component S1V1 having one styrene-derived unit and one 1,2-bonded butadiene-derived unit being less than 80 wt.% of the bonded styrene content and a total of styrene content of the ozone-decomposed component S1V1 being 10 wt.% or greater of the bonded styrene content; (3) an integrated intensity of an ozone-decomposed component S1V2 having one styrene-derived unit and two 1,2-bonded butadiene-derived units being 15% or greater of an integrated intensity of all ozone-decomposed components containing a styrene-derived unit; and (4) a vinyl content of butadiene moiety being 50% or greater.
目的
提供一种橡胶组合物,该组合物可将低蓄热性提高到或超过传统
水平,同时确保耐磨性。
解决方法
该橡胶组合物包含一种二烯橡胶,其中含有由至少一种
苯乙烯-
丁二烯共聚物形成的
苯乙烯-
丁二烯共聚物组分和一种补强填料;由至少一种
苯乙烯-
丁二烯共聚物形成的
苯乙烯-
丁二烯共聚物组分满足以下条件:(1) 键合
苯乙烯含量为 5 至 50 wt.%; (2) 具有一个
苯乙烯衍生单元的
臭氧分解组分 S1 和具有一个
苯乙烯衍生单元和一个 1,2-键合
丁二烯衍生单元的
臭氧分解组分 S1V1 的
苯乙烯总含量低于键合
苯乙烯含量的 80 wt.%,
臭氧分解组分 S1V1 的
苯乙烯总含量为键合
苯乙烯含量的 10 wt.(3) 具有一个
苯乙烯衍生单元和两个
1,2-丁二烯衍生单元的
臭氧分解组分 S1V2 的综合强度为所有含有
苯乙烯衍生单元的
臭氧分解组分综合强度的 15%或以上;以及 (4)
丁二烯分子的
乙烯基含量为 50%或以上。