| 摘要 |
PURPOSE:To obtain the titled high-performance catalyst which requires no deashing step because of an extremely low catalyst residue content and can give a highly stereoregular polymer in high yields, by contacting a specified solid catalyst component with a silicon compound and an organoaluminum compound. CONSTITUTION:A solid catalyst component (A) is obtained by contacting a composition obtained by suspending 1g of a dialkoxymagnesium (a) (e.g., diethoxymagnesium) in a normally liquid aromatic hydrocarbon (b) (e.g., toluene) and contacting the obtained suspension with at least 0.1g of a titanium halide (c) (e.g., TiCl4) in a temperature range of -20 to the b.p. to component C with 0.01-2g of an aromatic dicarboxylic acid diester (d) (e.g., dibutyl phthalate) and component (c) in said temperature range. Component A is mixed with 1-1,000mol, per mol of Ti of component A, organoaluminum compound (B) (e.g., trialkylaluminum) and 0.01-0.5mol, per mol of component B, of a silicon compound (C) of the formula (wherein R' is alkyl or aryl, R is H or R' and 0<=m<=4).
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