Olefin polymerization using a catalyst having a bridged cyclopentadienyl-phosphole ligand
US6051667A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1998 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Apr 24, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An olefin polymerization process uses a catalyst with an organometallic complex of a group 4 metal having a bridged cyclopentadienyl-phosphole ligand, as defined by the formula: ##STR1## wherein: each Sl is a non-interfering spectator ligand; PA1 Y is selected from Si, Ge and Sn; PA1 Z is 2; PA1 R.sub.1, R.sub.2, and R.sub.3 are hydrogen or non-interfering substituents; PA1 Cp* is selected from cyclopentadienyl, substituted cyclopentadienyl, indenyl, substituted indenyl, fluorenyl and substituted fluorenyl; PA1 M4 is selected from Ti, Zr and Hf; PA1 X is an anionic ligand; and PA1 n is 1 or 2, depending upon the oxidation state of M4. A catalyst having a fluorenyl ligand and a dimethyl silyl bridge is preferred. This invention may be used to prepare polyethylenes having a broad molecular weight distribution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.