Process for the preparation of copolycarbonates of sulfonyl diphenol
US4535143A · kind A · utility
2Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1984 |
| Grant date | Aug 13, 1985 |
| Priority date | — |
| Expiry date | Aug 6, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/081
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is directed to a continuous process for the preparation of copolycarbonates of sulfonyl diphenol (SDP) containing at least about 15, preferably about 15 to about 80 percent by weight of SDP and characterized in the particular system catalyzing the process reaction. The invention thus entails improvements and modifications to the known interfacial polycondensation process rendering it applicable to the preparation of copolycarbonates containing a high level of SDP comprising a combination of catalysts namely a phase transfer catalyst and a condensation catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.