Patent ID: 6303532
Filing Date: 2001-10-16
Classification: C08F

Abstract:
A catalyst composition for polymerizing olefins, which catalyst composition is prepared by the steps comprising of:(a) combining a solid magnesium chloride carrier, an alcohol, a titanium compound and a donor comprised of a first alkyl ester of phthalic acid in an inert hydrocarbon to form an intermediate catalyst mixture, said alcohol having a formula ROH wherein R is a C.sub.1 -C.sub.2 alkyl group, said first alkyl ester of phthalic acid including an alkyl group containing at least five carbon atoms, said inert hydrocarbon having a boiling point which is greater than the boiling point of said titanium compound, said titanium compound including titanium having an oxidation degree of at least three;(b) heating said intermediate catalyst mixture to a reaction temperature between about 110-150.degree. C. for a time period to transesterify said alcohol and said first alkyl ester of phthalic acid into a transesterification product having a second ester of phthalic acid containing said C.sub.1 -C.sub.2 alkyl group; and(c) recovering said transesterification product as said catalyst composition, said transesterification product containing up to about 2.5 weight percent titanium and has a molar ratio donor/Mg of at least about 0.03.