PROCESS FOR POLYMERIZING OR COPOLYMERIZING OLEFINS CONTAINING AT LEAST 3 CARBON ATOMS

摘要

A process for preparing a highly crystalline olefin polymer or copolymer, which comprises polymerizing or copolymerizing an olefin containing at least 3 carbon atoms in the presence of a catalyst comprising (a) a solid titanium catalyst component obtained by roacting a solid magnesium component with a titanium compound in the absence of a free organometallic compound of a metal of Groups I and III of the periodic table and separating the solid component of the resulting reaction product, said solid magnesium component being obtained by separating a solid from a suspension of a reaction product derived from (i) a magnesium halide, (ii) an active hydrogen-containing orgainic compound, (iii) an orgainc acid ester and (iv) an organometallic compound of a metal of Groups I to III of the periodic table, and (b) an organometallic compound of a metal of Groups I to III of the periodic table.