Solid metallocene catalyst system
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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Abstract
A solid metallocene-containing catalyst system of an organoaluminoxane, at least one metallocene having at least one olefinically unsaturated substituent and a polyolefin is disclosed. The polyolefin is formed from at least one olefin polymerized in the presence of a combination of a solution of the organoluminoxane in an aromatic liquid, the at least one metallocene, and an aliphatic liquid. The solid metallocene-containing catalyst system may also include one or more the particulate solids.
Claims54
A solid prepolymerized catalyst system produced by a process comprising:
- (a) combining an organoaluminoxane dissolved in an aromatic liquid, at least one metallocene having at least one olefinically unsaturated substituent, and an aliphatic liquid to form a liquid catalyst system;
- (b) conducting prepolymerization of at least one olefin in the presence of the liquid catalyst system to produce a prepolymerized solid catalyst;
- and
- (c) separating the resulting solid from the liquid and components dissolved in the liquid,
- wherein the solid prepolymerized catalyst system has an activity greater than a second catalyst formed by polymerizing the at least one olefin in the presence of the organoaluminoxane, the at least one metallocene, and either the aromatic liquid or the aliphatic liquid;
- and
- wherein the activity of the solid prepolymerized catalyst system and the activity of the second catalyst are evaluated under like conditions.
A solid metallocene-containing catalyst system comprising:
- an organoaluminoxane;
- at least one metallocene having at least one olefinically unsaturated substituent;
- and
- a polyolefin comprising at least one olefin polymerized in the presence of a combination of a solution of the organoluminoxane in an aromatic liquid, the at least one metallocene, and an aliphatic liquid,
- wherein the solid metallocene-containing catalyst system has an activity greater than a second catalyst formed by polymerizing the at least one olefin in the presence of the organoaluminoxane, the at least one metallocene, and either the aromatic liquid or the aliphatic liquid;
- and
- wherein the activity of the solid prepolymerized catalyst system and the activity of the second catalyst are evaluated under like conditions.
Dependencies are inferred from the claim text.