Thermally initiated polymerization of olefins using Ruthenium or osmium vinylidene complexes
US6107420A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1999 |
| Grant date | Aug 22, 2000 |
| Priority date | — |
| Expiry date | Jul 26, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/922
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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 become 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.degree. 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.