Supported metallocene-alumoxane catalysts for the preparation of polyethylene having a broad monomodal molecular weight distribution
US5914289A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 7, 1997 |
| Grant date | Jun 22, 1999 |
| Priority date | — |
| Expiry date | Feb 7, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.