Solid phase polyarylate process
US5064930A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1990 |
| Grant date | Nov 12, 1991 |
| Priority date | — |
| Expiry date | Sep 27, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/80
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process comprising PA0 (A) preparing a solid polyarylate prepolymer having an inherent viscosity of at least about 0.1 by heating at a temperature in the range of 140.degree. C. to 300.degree. C. in the melt phase an acid anhydride derived from a carboxylic acid containing 2 to 6 carbon atoms, a dihydric phenol and an aromatic dicarboxylic acid in the presence of a hypernucleophilic base which comprises a heterocyclic aromatic compound containing nitrogen and having an aprotic electron releasing group directly bonded to a carbon atom in the aromatic compound, and PA0 (B) increasing the molecular weight of the solid polyarylate prepolymer to an inherent viscosity of at least 0.4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.