CONTROLLED MORPHOLOGY HIGH ACTIVITY POLYOLEFIN CATALYST SYSTEM

摘要

A high activity polyolefin catalyst system comprising titanium containing pro- catalyst component, a co-catalyst component and an external electron donor compound is provided wherein the high activity polyolefin catalyst system is having controlled morphology and less fines. The present invention is more directed to provide a method for the preparation of titanium containing pro- catalyst component from solid spherical shaped magnesium containing pro- catalyst precursor wherein the spherical morphology of the pro-catalyst precursor is maintained through out the reaction in order to achieve titanium-containing pro- catalyst having controlled morphology. The polymerization of lower olefins in the presence of high activity polyolefin catalyst having controlled morphology provides polyolefins with minimal polymer fines.