| 摘要 |
Components of catalysts for polymerizing olefins are obtained by grinding together an anhydrous magnesium halide, an ester of an aromatic carboxylic acid and a silicon compound having alkenyl groups and alkoxy groups bound to the silicon atom, of the type of vinyl-triethoxy-silane, and by successively reacting the ground product with a halogenated titanium compound, liquid under the reaction conditions, such as TiCl4. The present invention provides not only the aforesaid catalyst components for the polymerization of olefins, but also catalysts obtained therefrom and the use of the same, particularly in the polymerization of the alpha-olefins CH2=CHR wherein R is an alkyl or aryl radical with from 1 to 8 carbon atoms. In the case of the polymerization of alpha-olefins, the catalytic components, when mixed with organometallic aluminum compounds, yield final catalysts which result in an increase in the polymer yield without lowering the isotacticity index of the polymer.
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