Process for polymerization of alpha -olefins and catalysts therefor

摘要

Stereospecific polymerization of alpha -olefins is carried out with use of a catalyst comprising an activated titanium component obtained by treating copulverized products of magnesium halide, an organosilicon compound having at least one alkoxyl group and a halogenated hydrocarbon with titanium halide, an organoaluminum compound and an electron donative compound.