Catalyst compositions for the polymerization of olefins
US6200925A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1998 |
| Grant date | Mar 13, 2001 |
| Priority date | — |
| Expiry date | Dec 29, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention provides catalyst systems useful in the polymerization of olefins comprising a transition metal component and a ligand component comprising a Nitrogen atom and/or functional groups comprising a Nitrogen atom, generally in the form of an imine functional group. In certain embodiments, the ligand component may further comprise a phosphorous atom. Preferred ligand components are bidentate (bind to the transition metal at two or more sites) and include a nitrogen-transition metal bond. The transition metal-ligand complex is generally cationic and associated with a weakly coordinating anion. In a preferred embodiment, the catalyst system of the present invention further comprises a Lewis or Bronsted acid complexed with the ligand component of the transition metal-ligand complex.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.