Patent ID: 6384160
Filing Date: 2002-05-07
Classification: C08F

Abstract:
A process of polymerizing &agr;-olefins comprising:a) selecting a Ziegler-Natta catalyst component for the polymerization of propylene wherein the catalyst component comprises: 1) the halogenated reaction product of magnesium ethoxide and a halogenating agent; 2) an electron donor wherein the electron donor is diethyl phthalate or di-isobutyl phthalate and wherein the ratio of electron donor to magnesium ethoxide is 0.1 mmole phthalate/g Mg(OEt)2 to 0.2 mmole phthalate/g Mg (OEt)2; 3) a titanating agent; b) contacting the catalyst component with an organoaluminum cocatalyst to form an activated catalyst; c) contacting the catalyst component or activated catalyst with dicyclopentyldimethoxysilane as an external electron donor simultaneous with or after contacting the catalyst component with the organoaluminum compound; d) introducing the activated catalyst into a polymerization reaction zone containing propylene; and e) extracting polymer product from the reactor.