| abstract |
Disclosed is an aromatic vinyl compound-conjugated diene compound copolymer capable of imparting a tire with excellent wear resistance and wet skid resistance. Specifically disclosed is an aromatic vinyl compound-conjugated diene compound copolymer having not less than 80% of cis-1,4 bonds in the conjugated diene compound moiety, which is obtained by addition polymerization of an aromatic vinyl compound and a conjugated diene compound in the presence of a polymerization catalyst composition containing at least one specific metallocene complex selected from metallocene complexes represented by general formula (I) and the like. (In the formula, M represents a lanthanoid element, scandium or yttrium,; Cp R 's independently represent an unsubstituted or substituted indenyl; R a -R f independently represent an alkyl group having 1-3 carbon atoms or a hydrogen atom; L represents a neutral Lewis base; and w represents an integer of 0-3.) |