Catalyst system for polycarbonate manufacture
US5744416A · kind A · utility
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11References
11Claims
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Key dates
| Filing date | Feb 8, 1996 |
| Grant date | Apr 28, 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 method is provided for making polycarbonates utilizing an effective amount of a binary phase transfer catalyst, such as tetrabutylammonium bromide and a methyl tertiary amine as a condensation catalyst during the interfacial phosgenation of a bisphenol, such as bisphenol A. Improved phosgene utilization is achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.