Poly(ester-carbonates) from dicarboxylic acid chlorides
US4194038A · kind A · utility
145Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1979 |
| Grant date | Mar 18, 1980 |
| Priority date | — |
| Expiry date | Jan 25, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/64
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for poly(ester-carbonates) from dihydric phenols, especially bisphenol A; aromatic or cycloaliphatic dicarboxylic acids, especially terephthalic acid; and phosgene as carbonate precursor wherein a reaction of the acid and phosgene is carried out in a first stage forming dicarboxylic acid chloride; and then phosgene and bisphenol A are added in separate streams, simultaneously during most of the second or condensation stage. Thereby only one kettle is required for carrying out the complete polymer production.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.