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US 7,582,711 B2Granted
Ziegler-type catalysts having increased productivity
AssigneeUnivation Technologies, LLC
InventorsChi-I Kuo, Steven K. Ackerman
Life of this patent
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Abstract
The present invention relates to catalyst systems for polyolefin production, and more particularly, to catalyst systems for polyolefins used in producing films.
Claims7
A process for producing a bimodal polyolefin composition comprising:
- contacting hydrogen and ethylene monomers with a supported, activated bimetallic catalyst system to form a bimodal polyolefin composition;
- wherein the supported, activated bimetallic catalyst system comprises:
- (a) a support material, the support material contacted with an organomagnesium compound at a rate such that no more than 0.024 mmole magnesium is contacted with each gram of the support material per minute;
- (b) an activator that comprises aluminum;
- (c) a non-metallocene catalyst component;
- and
- (d) a metallocene catalyst component comprising a metal atom “M”;
- wherein the molar ratio of aluminum to metal atom “M” is in the range of from 50:1 to 80:1.
5 more elements
A process of producing a bimodal polyolefin composition, comprising:
- (a) providing a dehydrated support material;
- (b) providing a support slurry by contacting the dehydrated support material with an organomagnesium compound at a rate such that no more than 0.024 mmole magnesium is contacted with each gram of dehydrated support material per minute;
- (c) providing a non-metallocene catalyst component that includes a non-metallocene catalyst compound;
- (d) providing a metallocene catalyst component that includes a metallocene catalyst compound;
- (e) combining the support slurry with the non-metallocene and metallocene catalyst components to form a supported bimetallic catalyst system;
- and
- (f) contacting monomers with the bimetallic catalyst system for a time sufficient to form a bimodal polyolefin composition;
- wherein the metallocene catalyst component comprises an activator that comprises aluminum;
- wherein the metallocene catalyst compound comprises a metal atom “M,” and wherein the molar ratio of aluminum to metal atom “M” is in the range of from 50:1 to 80:1.
6 more elements
Dependencies are inferred from the claim text.