| abstract |
Catalyst components for the polymerization of olefines, 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. n<??>In the case of the polymerization of alpha-olefines, such catalytic components allow to increase the yield without lowering the isotacticity index of the polymer. |