Synthesis of polycarbonate from dialkyl carbonate and bisphenol diester
US4452968A · kind A · utility
13Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1983 |
| Grant date | Jun 5, 1984 |
| Priority date | — |
| Expiry date | Mar 25, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polycarbonates are formed by the interaction of a bisphenol diester, carbon monoxide and oxygen. The initial polycarbonate product is an oligomer which, upon heat treatment, polymerizes to a high molecular weight polycarbonate. The products produced according to the present invention are chainstopped prior to heat treatment, making them less thermally and oxidatively sensitive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.