The present invention is to provide an aromatic vinyl-diene copolymer which exhibits excellent mechanical properties and wear resistance when being formed into a tire, a method for producing the aromatic vinyl-diene copolymer, and a rubber composition containing the aromatic vinyl-diene copolymer. The aromatic vinyl-diene copolymer of an embodiment of the present invention is an aromatic vinyl-diene copolymer which is a copolymer of an aromatic vinyl and a diene, wherein the content of a repeating unit derived from an aromatic vinyl is 18 mass % or greater, among repeating units derived from a diene, a proportion of a vinyl structure is 8 mol % or less, a proportion of a 1,4-trans structure is 75 mol % or less, and a proportion of a 1,4-cis structure is from 17 to 90 mol %, and a glass transition temperature is −60° C. or lower.
本发明旨在提供一种芳香族
乙烯基-二烯共聚物,该共聚物在制成轮胎时可表现出优异的机械性能和耐磨性;本发明还旨在提供一种芳香族
乙烯基-二烯共聚物的生产方法,以及一种含有该芳香族
乙烯基-二烯共聚物的橡胶组合物。本发明一个实施例中的芳香族
乙烯基-二烯共聚物是一种芳香族
乙烯基-二烯共聚物,它是芳香族
乙烯基和二烯的共聚物,其中由芳香族
乙烯基衍生的重复单元的含量为 18 质量%或更高,在由二烯衍生的重复单元中,
乙烯基结构的比例为 8 摩尔%或更低,1,4-反式结构的比例为 75 摩尔%或更低,1,4-顺式结构的比例为 17 至 90 摩尔%,
玻璃化转变温度为 -60°C 或更低。或更低。