| 摘要 |
PROBLEM TO BE SOLVED: To develop a catalyst for extending the molecular weight distribution and improving the melt tension, having a high catalyst activity and producing anα-olefin polymer having excellent high-speed moldability, high-speed drawability and production stability. SOLUTION: The catalyst for polymerizing theα-olefin is obtained by combining (A) a solid catalyst component consisting essentially of magnesium, titanium, a halogen and a butanedioic acid diester comprising a specific substituent directly bound through an oxygen atom or a sulfur atom to the main skeleton with (B) an organoaluminum compound and, as necessary, (C) a silicon compound or a diether compound. A method for polymerizing theα-olefin comprises using the catalyst. COPYRIGHT: (C)2004,JPO
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