Process for preparing polyolefins

摘要

According to the present invention, there is provided a process for preparing polyolefins by polymerizing or copolymerizing olefins in the presence of a catalyst consisting of a solid component and an organometallic compound component, characterized in that said solid component is obtained by copulverizing (1) A MAGNESIUM HALIDE AND/OR A MANGANESE HALIDE, (2) AN AROMATIC HYDROCARBON, (3) A TETRAVALENT TITANIUM COMPOUND, AND (4) A TRIVALENT TITANIUM COMPOUND AND IN THAT SAID ORGANOMETALLIC COMPOUND COMPONENT IS A MIXTURE OF (5) A TRIALKYLALUMINUM AND (6) A COMPOUND REPRESENTED BY THE GENERAL FORMULA AlRnX3-n wherein R is alkyl having 1 to 10 carbon atoms and may be the same or different, X is halogen and O