Process for preparation of polycarbonate
US5025083A · kind A · utility
8Cited by
1References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1990 |
| Grant date | Jun 18, 1991 |
| Priority date | — |
| Expiry date | Feb 2, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/307
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polycarbonate is produced by melt-polycondensing (A) a dihydric phenol with a co-monomer selected from the group consisting of (B) bisphenol carbonate, (C) bis(2,4,6-trichlorophenyl) carbonate (D) bis(2,4,-dichlorophenyl) carbonate and (E) bis(2-cyanophenyl) carbonate in the presence of a catalyst selected from among electron-donating amine compounds and salts thereof. The process of the invention saves the use of phosgene which is poisonous and prevents the resulting polycarbonate from incorporation thereinto of chlorine ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.