A method of making an olefin polymerization catalyst is disclosed. The method
involves
contacting a magnesium halide compound with an alcohol, adding a mineral oil to
the product, reacting this product with a hydroxylated ester and an alkoxy silane,
then adding a titanium compound and a second silicon compound. The titanium compound
is preferably an alkoxy halide, and the second silicon compound is preferably a
silicon halide.
