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 a metal M which may be Ti, Zr or Hf, wherein a plurality of conformers of the metallocene are formed and isolated on the support by reaction of the metallocene with the alumoxane and depositing the product formed on the support at a temperature in the range 85.degree. C. to 110.degree. C.
Claims9
A catalyst system comprising a metallocene-alumoxane catalyst for use in the preparation of polyolefins having a broad monomodal molecular weight distribution and a support for supporting the catalyst, wherein the metallocene comprises at least one hydrogenated indenyl or fluorenyl, a metal, and a bridge between (a) said at least one hydrogenated indenyl or fluorenyl and (b) another hydrogenated or non-hydrogenated indenyl or fluorenyl;
- and wherein a plurality of conformers of the metallocene are formed and isolated on the support by reaction of the metallocene with the alumoxane and depositing the product formed on the support at a temperature in the range of 85.degree. C. t 110.degree. C.
Dependencies are inferred from the claim text.