Provided are a catalyst for a conjugated diene polymerization capable of producing a conjugated diene polymer having a high content of cis-1,4-structures with a high activity, a conjugated diene polymer and a modified conjugated diene polymer using the same, production methods thereof, a rubber composition for a tire, and a rubber composition for a rubber belt. Described are a catalyst for a conjugated diene polymerization including: a non-metallocene type gadolinium compound (A) represented by the general formula (1); an ionic compound (B) formed of a non-coordinating anion and a cation; and an organic metal compound (C) of an element selected from the group consisting of a group 2, a group 12, and a group 13 of the periodic table, a conjugated diene polymer and a modified conjugated diene polymer obtained using the same, production methods thereof, a rubber composition for a tire, and a rubber composition for a rubber belt.
提供了一种共轭二烯聚合催化剂,该催化剂能够生产具有高活性的高顺式-1,4-结构含量的共轭二烯聚合物、使用该催化剂的共轭二烯聚合物和改性共轭二烯聚合物、其生产方法、轮胎橡胶组合物和橡胶带橡胶组合物。所述共轭二烯聚合催化剂包括由通式(1)表示的非茂
金属型
钆化合物(A);由非配位阴离子和阳离子形成的离子化合物(B);以及选自元素周期表中第 2 族、第 12 族和第 13 族的元素组成的组的有机
金属化合物(C)、使用该催化剂获得的共轭二烯聚合物和改性共轭二烯聚合物、其生产方法、轮胎橡胶组合物以及橡胶带橡胶组合物。