A conjugated diene polymer is produced by continuously polymerizing a conjugated diene monomer with a catalyst consisting essentially of specified components (a) to (c) and reacting with at least one of specified components (d) and (e) and has a content of cis-1,4-bond of not less than 85%, a content of 1,2-vinyl bond of not more than 2.0% and a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) of not more than 5, and contains at least one functional group selected from epoxy group and hydroxyl group in its molecule. And also, a rubber composition comprises 10-200 parts by weight of silica based on 100 parts by weight of rubber ingredient consisting of 10-100% by weight of the above conjugated diene polymer and 90-0% by weight of the other diene polymer or natural rubber.
共轭二烯聚合物是由共轭二烯单体与主要由指定组分(a)至(c)组成的催化剂连续聚合,并与指定组分(d)和(e)中的至少一种反应而制得,其顺式-1,4-键的含量不低于 85%,1,2-
乙烯基键的含量不超过 2.0%,重量平均分子量(Mw)与数量平均分子量(Mn)之比不大于 5,且其分子中至少含有一个选自环氧基和羟基的官能团。此外,一种橡胶组合物包含 10-200 份(重量)
白炭黑,基于 100 份(重量)橡胶配料,其中包括 10-100% (重量)上述共轭二烯聚合物和 90-0% (重量)其他二烯聚合物或
天然橡胶。