Catalyst composition for polymerization of cycloolefins
US4696985A · kind A · utility
46Cited by
31References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 27, 1986 |
| Grant date | Sep 29, 1987 |
| Priority date | — |
| Expiry date | Mar 27, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G61/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a catalyst composition for polymerization of norbornene-type monomer: including WCl.sub.4 O and WCl.sub.6 in a molar ratio of WCl.sub.4 O to WCl.sub.6 from 1:9 to 1:1 (i.e., 10-50% WOCl.sub.4 and 90-50% WCl.sub.6). The method of making catalyst includes: providing catalyst precursor material, the major portion of which is WCl.sub.6, and contacting controlled proportions of the oxygen donor and WCl.sub.6 to form WCl.sub.4 O in a molar ratio to WCl.sub.6 of between 1:9 and 1:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.