Process for producing ethylene/.alpha.-olefin copolymer
US6207774A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1997 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Oct 8, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An ethylene/.alpha.-olefin copolymer of a weight-average molecular weight of not less than 40000 is produced by copolymerization of ethylene with an .alpha.-olefin having three or more carbons by use of an olefin polymerization catalyst at a polymerization temperature of not lower than 120.degree. C., the olefin polymerization catalyst comprising, as constitutional components, a) a metallocene compound, b) an ionizing ionic compound, and c) an organoaluminum compound, the ionizing ionic compound (b) being a compound which is capable of changing the metallocene compound (a) into a cationic form and does not further react the cationic form of the metallocene compound. This process produces an ethylene/.alpha.-olefin copolymer of high molecular weight in high efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.