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US 6,225,428 B1Granted
Supported metallocene-alumoxane catalysts for the preparation of polyethylene having a broad monomodal molecular weight distribution
AssigneeFina Research, S.A.
InventorAbbas Razavi
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Abstract
The present invention relates to the production of high density polyethylene homopolymers or copolymers having a broad and monomodal molecular weight distribution wherein the polymerization process is conducted in the presence of supported metallocene-alumoxane catalysts wherein the metallocene is bridged, comprises at least a hydrogenated indenyl or fluorenyl and is isolated on its support under the form of all its conformers.
Claims11
Process for the preparation of polyolefins having a broad monomodal molecular weight distribution comprising:
- (a) providing a supported metallocene-alumoxane catalyst wherein the metallocene
- is bridged,
- comprises at least a hydrogenated indenyl or fluorenyl, and
- is isolated on its support under the form of all conformers;
- (b) contacting said catalyst system in a polymerization reaction zone with at least one olefin;
- and
- (c) maintaining said reaction zone under polymerization conditions to produce a polyolefin having a broad monomodal molecular weight distribution.
4 more elements
Dependencies are inferred from the claim text.