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AssigneeChevron Phillips Chemical Company LP
InventorsKent E. Mitchell, Gary L. Glass, L. Matthew Kirchman, Robert K. Provence, Leigh A. Ford, Randall S. Muninger
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Methods are disclosed for preparing a highly active solid metallocene-containing catalyst system and its use in the polymerization of olefins. The catalyst system is prepared by creating a catalyst system solution by combining an aluminoxane with a metallocene having a substituent which has olefinic unsaturation in an aliphatic liquid to form a liquid catalyst system, conducting prepolymerization of an olefin in the liquid catalyst system, preferably in multiple stages, and separating the resulting solid metallocene-containing catalyst system from the reaction mixture. Also polymerization of olefins using the inventive solid catalyst system is disclosed.
A method for preparing a solid metallocene-containing catalyst system comprising (a) combining a solution of an organoaluminoxane in an aromatic liquid and at least one metallocene having at least one olefinically unsaturated substituent in an aliphatic liquid to form a liquid catalyst system, (b) conducting prepolymerization of at least one olefin in the presence of said liquid catalyst system to produce a prepolymerized solid catalyst, and (c) separating the resulting solid from the liquid and components dissolved in said liquid.
Dependencies are inferred from the claim text.