Polyphenols as polycarbonate branching agents
US5948876A · kind A · utility
3Cited by
17References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1997 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Dec 11, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Branched polycarbonates are prepared by the reaction of a linear or branched polycarbonate with a branching resin having a molecular weight up to about 3,000, typically a novolak or a bisphenol polymer. The reaction preferably takes place in the presence of a carbonate equilibration catalyst such as a quaternary bisphenolate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.