| 摘要 |
A process for polymerizing or co-polymerizing propylene in the presence of a catalyst consisting essentially of (A) a solid catalyst component which is prepared by contacting (1) a copulverized material obtained by copulverizing a magnesium dihalide compound together with an acyl halide with (2) a mixture or addition-reaction product of a tetravalent titanium compound containing at least one halogen atom with at least one electron donor compound selected from the group consisting of organic compounds containing a P-O bond, organic compounds containing an Si-O bond, ether compounds, nitrite ester compounds, sulfite ester compounds, alcohol compounds, phenol compounds and naphthol compounds, (B) a trialkyl aluminum compound, and (C) a carboxylic acid ester compound.
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