| abstract |
PROBLEM TO BE SOLVED: To provide a polymerization catalyst for producing a polymer having a high content of a cis 1,4-structure in a microstructure and a narrow molecular weight distribution. A catalyst composition for polymerizing a conjugated diene, comprising: (A) a metallocene complex of a rare earth metal compound (such as a samarium complex); and (B) a non-coordinating anion and a cation. A composition comprising an ionic compound (such as triphenylcarbonium tetrakis (pentafluorophenyl) borate) and / or an aluminoxane. |