Patent ID: 7601664
Filing Date: 2009-10-13
Classification: C08F

Abstract:
1. A method of making a solid procatalyst composition for use in a Ziegler-Natta olefin polymerization procatalyst composition, said method comprising: (a) contacting a precursor composition comprising a magnesium compound with a titanium halide compound and an internal electron donor in any order, in a suitable reaction medium to prepare a solid procatalyst composition, wherein the solid precursor compound is a magnesium dialkoxide or a carboxylated magnesium dialkoxide or is of the formula Mg (b) separating the solid procatalyst from the reaction medium, (c) rinsing the solid procatalyst from step (b), (d) subsequent to the rinsing step (c), extracting the solid procatalyst composition by contacting the same one or more times with a liquid diluent selected from the group consisting of aliphatic, cycloaliphatic and aromatic hydrocarbons, halogenated derivatives thereof, and mixtures of the foregoing at an elevated temperature from about 115° C. to about 200° C. for a period of time sufficient to prepare a solid procatalyst composition having a titanium content of from 0.15% to 2% by weight, and (e) recovering the solid procatalyst composition.