A method of making an olefin polymerization catalyst is disclosed. The method
first
combines a magnesium halide with an alcohol, then adds a hydroxylated ester and
a silicon alkoxide, followed by a titanium compound and another silicon compound
to result in a solid composition. This solid composition is then reacted with an
aluminum compound and an alkyl halide, followed by reaction with a second titanium
compound which may be the same as or different from the first. The second silicon
compound is preferably a silicon halide, and the titanium compounds are preferably
halides and alkoxides. The aluminum compounds preferably have chloride and alkyl
ligands bonded to them.
