| 摘要 |
The present invention relates to a catalyst composition for polymerization of a conjugated diene, comprising: (A) ametallocene-type complex represented by a general formula (I): (C<SUB>5</SUB>R<SUP>1</SUP>R<SUP>2</SUP>R<SUP>3</SUP>R<SUP>4</SUP>R<SUP>5</SUP>)<SUB>a</SUB>MX<SUB>b</SUB>.L<SUB>c </SUB>(where, M represents a rare earth metal; C<SUB>5</SUB>R<SUP>1</SUP>R<SUP>2</SUP>R<SUP>3</SUP>R<SUP>4</SUP>R<SUP>5 </SUP>represents a substituted cyclopentadienyl group; R<SUP>1 </SUP>to R<SUP>5 </SUP>represent the same or different hydrocarbon groups (except when R<SUP>1</SUP>=R<SUP>2</SUP>=R<SUP>3</SUP>=R<SUP>4</SUP>=R<SUP>5</SUP>=a methyl group); X represents a hydrogen atom, a halogen atom, an alkoxide group, a thiolate group, an amide group, or a hydrocarbon group having 1 to 20 carbon atoms; L represents a Lewis basic compound; "a" represents an integer of 1, 2, or 3; "b" represents an integer of 0, 1, or 2; and "c" represents an integer of 0, 1, or 2); and (B) an ionic compound composed of a non-coordinating anion and a cation, and/or an aluminoxane. The present invention provides a catalyst composition for polymerization for production of a polymer having a high content of cis-1,4-configuration in microstructure and a narrow molecular weight distribution.
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