| 摘要 |
A process for the homopolymerization or copolymerization of olefins is disclosed, which is carried out in the presence of an improved catalyst comprising a solid catalyst component and an organometal compound, said solid catalyst component being obtained by the reaction of: (a) a magnesium halide, (b) a compound represented by the formula: Me(OR)nXz-n where Me is any of the Group I-VIII elements of the Periodic Table, excluding Al, Si, Ti and V, R is a hydrocarbon residual group having 1-24 carbon atoms, X is a halogen atom, z represents the valence of Me and n is 0<n</=z, and (c) a compound represented by the formula: Si(OR')mX4-m where R' is a hydrocarbon residual group having 1-20 carbon atoms, X is a halogen atom, and m is 0</=m</=4, and (d) a titanium compound and/or a vanadium compound. The resulting polymers are characterized by a large bulk density, a narrow range of molecular weight distribution, and small amounts of hexane extraction.
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