BUTADIENE POLYMER, PROCESS FOR THE PREPARATION OF CONJUGATED DIENE POLYMERS, AND CATALYST

摘要

A butadiene polymer in which cis-configuration units resulting from a conjugated diene whose main skeleton has four carbon atoms account for at least 50 % of the whole of the units and which has an Mw/Mn ratio of 1.9 or below and an Mw value of 1,000 to 10,000,000. It can be prepared by polymerizing such a conjugated diene in the presence of a catalyst comprising (A) a group IV transition metal compound having a cyclopentadienyl skeleton and bearing one or more carbonyl or sulfonyl groups as the substituent and (B) an aluminoxane or an ionic compound capable of forming a cationic transition metal compound through the reaction thereof with the compound (A).