Provided is a rubber composition for a tire containing a rubber component including 15 to 55 wt% of an end modified group-containing cycloolefin ring-opening polymer having a glass transition temperature of -120 to -90°C and 45 to 85 wt% of an end modified group-containing solution polymerized conjugated diene polymer having a glass transition temperature of -60 to -10°C and having an aromatic vinyl monomer unit content ratio of more than 30 wt% and 50 wt% or less, a silica, and a silane coupling agent including a monosulfide group and/or a thiol group, wherein the content of the silica with respect to 100 parts by weight of the rubber component is 30 to 200 parts by weight, and the content of the silane coupling agent including a monosulfide group and/or a thiol group with respect to 100 parts by weight of the silica is 0.3 to 20 parts by weight.
本发明提供了一种用于轮胎的橡胶组合物,其橡胶成分包括 15 至 55 wt%的
玻璃化转变温度为 -120 至 -90°C 的含端改性基团的环烯开环聚合物和 45 至 85 wt%的
玻璃化转变温度为 -60 至 -10°C 的含端改性基团的溶液聚合共轭二烯聚合物,其芳香族
乙烯基单体单元含量比大于 30 wt%且小于 50 wt%、
白炭黑和包括单
硫醚基团和/或
硫醇基团的
硅烷偶联剂,其中
白炭黑的含量相对于 100 重量份的橡胶组分为 30 至 200 重量份,而包括单
硫醚基团和/或
硫醇基团的
硅烷偶联剂的含量相对于 100 重量份的
白炭黑为 0.3 至 20 份(重量比)。