| 摘要 |
Polyolefins exhibiting better particle properties are prepared by polymerizing an olefin or olefins in the presence of a catalyst comprising a solid catalyst component and an organometallic compound, the said solid catalyst component being prepared by reacting the following components ¢~! and ¢II! at first and then reacting the reaction product thus obtained with the following component ¢III!: ¢I! a reaction product obtained by reacting: (1) a silicon oxide and/or an aluminum oxide, and (2) a titanium compound, or a titanium compound and a vanadium compound, ¢II! a reaction product obtained by the reaction of: (1) a magnesium halide, (2) a compound represented by the general formula Me(OR)n X z-n wherein Me represents an element of J Groups I to IV in the Periodic Table, z represents the valence of the element Me, n is 0 < n ~ z, X is a halogen atom, and R is a hydrocarbon residue having 1 to 20 carbon atoms, and (3) a titanium compound, or a titanium compound and a vanadium compound; and ¢III! an organoaluminum compound.
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