Catalyst systems for the polymerization of olefins and the stereoregular polymerization of alpha-olefins via metallacyclic intermediates
US6743872B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2002 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Dec 18, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F110/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A novel family of olefin polymerization catalysts comprising three-membered titanacarbocycles is described and illustrated. The titanacarbocycles can be readily synthesized by utilizing di-n-butyltitanium dichloride or di-t-butyltitanium dichloride at −78° C. in alkane, cycloalkane, or aromatic hydrocarbon media. These catalysts exhibit sufficient stability after their preparation that they undergo a remarkable, unprecedented reaction whereby the titanium dichloride moiety is efficiently transferred to a substrate like diphenylacetylene, ethylene, or similar compounds in order to generate the three-membered titanacarbocycles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.