Metallocene catalyst and catalyst system for polymerizing an olefin having at least 3 carbon atoms
AssigneeFina Technology, Inc.
InventorsEdwar S. Shamshoum, Margarito Lopez, Ted G. Harris, III, Sehyun Kim
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Abstract
A polyolefin metallocene catalyst which includes two metallocene components, a stereorigid isospecific metallocene catalyst component and a stereorigid syndiospecific metallocene catalyst component, both of which are supported upon the same support. A method of forming a catalyst system includes contacting the above catalyst with a cocatalyst or Lewis acid. A method of polymerization includes contacting an olefin of at least 3 carbon atoms with the catalyst system.
Claims23
A catalyst system for polymerization of olefins of at least three carbon atoms comprising:
- (a) a catalyst support;
- (b) a stereorigid isospecific metallocene catalyst component supported upon the support;
- (c) a stereorigid syndiospecific metallocene catalyst component supported upon the support;
- and,
- (d) a cocatalyst or a Lewis acid ionic ionizing agent;
- wherein the catalyst system affords a mixture of both isospecific and syndiospecific polymers when reacted with alpha olefins having at least 3 carbon atoms in them, and the molar ratio of (b) to (c) is less than 1:1.
A method of making a catalyst system for polymerization of olefins of at least three carbon atoms, the method comprising:
- contacting a supported catalyst comprising (i) a catalyst support, (ii) a stereorigid isospecific metallocene catalyst component supported upon the support, and (iii) a stereorigid syndiospecific metallocene catalyst component supported upon the support, with a cocatalyst or a Lewis acid ionic ionizing agent;
- wherein the catalyst system affords a mixture of both isospecific and syndiospecific polymers when reacted with alpha olefins having at least 3 carbon atoms in them, and the molar ratio of (ii) to (iii) is less than 1:1.
Dependencies are inferred from the claim text.