Thermally initiated polymerization of olefins using ruthenium or osmium vinylidene complexes
USRE38676E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2002 |
| Grant date | Dec 21, 2004 |
| Priority date | — |
| Expiry date | Aug 21, 2022 |
Classification
- Technology area (CPC —)General
Abstract
The present invention generally relates to the use of certain ruthenium and osmium complexes that are substantially inactive at a first temperature (preferably about room temperature) but becomes progressively more active at a higher second temperature. This difference in reactivities allows the reaction mixture to be formed and manipulated at the first temperature until polymerization is desired. When appropriate, the reaction mixture is heated to a suitable temperature (preferably greater than 50° C.) to activate the catalyst and to initiate polymerization. Because both the initiation and the rate of polymerization may be controlled with temperature, the inventive methods are especially suitable for ring opening metathesis polymerization (“ROMP”) reactions and for molding polymer articles that require extended pot-lives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.