Supported olefin polymerization catalysts
AssigneeEquistar Chemicals, LP
InventorsShaotian Wang, Bradley P. Etherton, Karen E. Meyer, Michael W. Lynch, Linda N. Winslow, Leonard V. Cribbs, Jia-Chu X. Liu
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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 chemically treated with an organoaluminum, organosilicon, organomagnesium, or organoboron compound; (b) a single-site catalyst that contains a polymerization-stable, heteroatomic ligand; and (c) an activator. Chemical treatment is a key to making supported heterometallocenes that have high activity and long shelf-lives, and can effectively incorporate comonomers.
Claims16
A supported catalyst system which comprises:
- (a) a support chemically treated with an effective amount of a modifier selected from the group consisting of organoaluminum, organosilicon, organomagnesium, and organoboron compounds;
- (b) a single-site catalyst that contains at least one anionic, polymerization-stable, heteroatomic ligand;
- and
- (c) an activator.
A method which comprises:
- (a) treating a support with an effective amount of a modifier selected from the group consisting of organoaluminum, organosilicon, organomagnesium, and organoboron compounds;
- and
- (b) combining the treated support with a single-site catalyst that contains at least one anionic, polymerization-stable, heteroatomic ligand, and optionally with an activator, to produce a supported catalyst.
Dependencies are inferred from the claim text.