Supported olefin polymerization catalysts
AssigneeEquistar Chemicals, LP
InventorsShaotian Wang, Norma J. Maraschin, Debra L. Beran, William J. Sartain
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Abstract
A supported olefin polymerization catalyst system and a method of making it are disclosed. The catalyst system comprises: (a) a support having mean particle size less than about 30 microns chemically treated with alumoxane; (b) an organometallic complex comprising a Group 3 to 10 transition or lanthanide metal, M, and at least one indenoindolyl ligand that is π-bonded to M; and (c) an activator. Chemical treatment with alumoxane and support mean particle size less than 30 microns are key to making supported indenoindolyl containing catalysts having high activity.
Claims19
A catalyst system which comprises:
- (a) a support having mean particle size less than about 30 microns, wherein the support is chemically treated with alumoxane by adding the alumoxane to the support in an amount in the range of about 0.1 to 20 mmoles of aluminum contained in the alumoxane per gram of support;
- (b) an organometallic complex comprising a Group 3 to 10 transition or lanthanide metal, M, and at least one indenoindolyl ligand that is π-bonded to M;
- and
- (c) an activator.
A method which comprises:
- (a) treating a support, having mean particle size less than about 30 microns, with an effective amount of alumoxane;
- and
- (b) combining the treated support with an organometallic complex comprising a Group 3 to 10 transition or lanthanide metal, M, and at least one indenoindolyl ligand that is π-bonded to M, and optionally with an activator, to produce a supported catalyst.
Dependencies are inferred from the claim text.