Metallocene catalysts with lewis acids and aluminum alkyls
US5561092A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1993 |
| Grant date | Oct 1, 1996 |
| Priority date | — |
| Expiry date | Mar 30, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention is for a catalyst system comprising a neutral metallocene compound, an aluminum alkyl and a Lewis acid. The Lewis acid must be of sufficient acidity to ionize a neutral metallocene compound to form a cationic metallocene catalyst. The ligands of the Lewis acid should not be reactive with the metallocene cation. Any metallocene catalyst compound having two cyclopentadienyl rings, substituted or unsubstituted, attached to a transition metal which can be ionized by a Lewis acid would be useful in this invention. The invention is also for the process of making the catalyst system and the process for using the catalyst system in polymerization of olefins. The metallocene is contacted with the Lewis acid. The aluminum alkyl is contacted with the olefin. The two mixtures are contacted with each other under polymerization conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.