Process for the preparation of polycarbonates
US4826887A · kind A · utility
37Cited by
2References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1988 |
| Grant date | May 2, 1989 |
| Priority date | — |
| Expiry date | Aug 22, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2110/005
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Process for the preparation of polycarbonates by reacting at least one epoxy compound with carbon dioxide at 40.degree. to 200.degree. C. and 2 to 40 bar in the presence of a catalytic amount of a double metal cyanide complex and PA0 (a) one or more salts composed of at least bivalent metal ions and metal-free anions having a solubility in water of at least 1 g/100 ml at 25.degree. C., and/or PA0 (b) one or more no-metal containing acids of which a 0.1 N solution in water at 25.degree. C. has a pH not exceeding 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.