Method for making polycarbonates
US5804525A · kind A · utility
10Cited by
14References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1996 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Feb 8, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A composition and method is provided for making polycarbonate utilizing an effective amount of a binary catalyst system, comprising a phase transfer catalyst and a tertiary organic amine, as a condensation catalyst during the interfacial phosgenation of a bisphenol, such as bisphenol A. for improved phosgene utiliziation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.