CATALYST COMPOSITION

• Main Authors: AIDA SHOJIRO, WAKATSUKI YASUO, KOU SHIYOUMIN
• Format: Patent
• Language: English
• Published: 15.10.2003
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To provide a catalyst composition as a polymerization catalyst for producing polymers with high cis-1,4-structure content of the microstructure and narrow molecular weight distribution. SOLUTION: The catalyst composition for polymerizing a conjugated diene comprises (A) a metallocene-type complex of general formula (I): (C5R1R2R3R4R5)aMXb.Lc[wherein, M is a rare earth metal atom; C5R1R2R3R4R5is a substituted cyclopentadienyl group; R1to R5are each a hydrocarbon group (except the case that R1, R2, R3, R4and R5are each methyl); X is H, a halogen atom, alkoxido group, thiolato group, amido group or 1-20C hydrocarbon group; L is a Lewis base compound; (a) is an integer of 1, 2 or 3; b is an integer of 0, 1 or 2; and c is an integer of 0, 1 or 2] and (B) an ionic compound composed of a non-coordinating anion and cation and/or aluminoxane. COPYRIGHT: (C)2004,JPO