An object of the present invention is to provide a modified conjugated diene polymer that is excellent in processability and impact resilience, has markedly improved abrasion resistance and crack growth resistance, is excellent in low heat generation properties, and has low energy loss, a method for producing the same, and a rubber composition using the same. The invention of the present application provides a modified conjugated diene polymer obtained by polymerizing a conjugated diene compound using a catalyst including from (A) an yttrium compound having a bulky ligand represented by general formula (1), (B) an ionic compound formed of a non-coordinating anion and a cation, and (C) an organic metal compound of an element selected from the group consisting of group 2, group 12 and group 13 of the periodic table and modifying the conjugated diene polymer with a carbonyl compound, a method for producing the same, and a rubber composition using the same.
本发明的目的是提供一种加工性和抗冲击性优异、耐磨性和抗裂纹生长性明显改善、低发热性能优异、能量损失低的改性共轭二烯聚合物、生产该聚合物的方法以及使用该聚合物的橡胶组合物。本申请的发明提供了一种改性共轭二烯聚合物,通过使用催化剂聚合共轭二烯化合物而得,催化剂包括:(A) 具有通式(1)表示的大配位体的
钇化合物;(B) 由非配位阴离子和阳离子形成的离子化合物;以及 (C) 有机
金属化合物、和 (C) 选自元素周期表中第 2 族、第 12 族和第 13 族的元素的有机
金属化合物,并用羰基化合物对共轭二烯聚合物进行改性。