| 摘要 |
PURPOSE: To obtain the subject catalyst excellent in the copolymerizability of olefins, high in the activity and giving olefinic polymers having narrow molecular weights and a wide composition distribution by combining a specific transition metal compound with a compound capable of reacting with the transition metal compound to form an ionic complex. CONSTITUTION: A catalyst for polymerizing an olefin comprises (A) a transition metal compound of formula: CpMLmEn [M is titanium, zirconium, hafnium; Cp is a 5-substituted cyclopentadienyl of the formula (R<1> -R<5> are a 1-3C alkyl); L is a highly bulkyσ-binding ligand of formula: OR<6> , SR<6> , NR<6> R<7> , PR<6> R<7> (R<6> , R<7> are a 4-20C alkyl, a 6-20C aryl, a 7-20C aralkyl); E is H, a halogen, a 1-3C alkyl or aσ-binding ligand of formula: OR<8> , SR<8> , NR<8> R<9> , PR<8> R<9> (R<8> , R<9> are a 1-3C alkyl); m is 1-3; n is 0, 1, 2; m+n=3], (B) a compound capable of reacting with the component A or its derivative to form an ionic complex (preferably a linear and/or cyclic aluminoxane), and further preferably (C) a phenolic compound.
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