Patent ID: 7148299
Filing Date: 2006-12-12
Classification: C08F,Y10S

Abstract:
1. A catalyst for polymerization of a conjugated diene or for copolymerization of a conjugated diene and an aromatic vinyl compound, which is composed of a metallocene-type cation complex of a gadolinium compound, wherein the metallocene-type cation complex is a metallocene-type cation complex of a trivalent gadolinium compound represented by the general formula (I): R a GdX b wherein, Gd represents gadolinium; R represents a cyclopentadienyl group, a substituted cyclopentadienyl group, an indenyl group, a substituted indenyl group, a fluorenyl group, or a substituted fluorenyl group; X represents an anion; “a” represents an integer of 1 or 2; and “b” represents an integer of 1 or 2.