Acid interchange polymerization process for producing an aromatic polyester
US3948856A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 27, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Nov 27, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/82
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An improved acid interchange polymerization process for the formation of an aromatic polyester is provided. Ester and carboxylic acid functional groups are reacted in the presence of a catalytically effective amount of a catalyst consisting of a mixture of a transition metal salt of a strong inorganic acid and a transition metal salt of an aliphatic carboxylic acid containing up to about 4 carbon atoms. In a preferred embodiment of the process the reactants are at least one aromatic diester and at least one aromatic dicarboxylic acid. Alternatively, the ester and carboxylic acid functional groups required for the acid interchange reaction may be provided upon the same molecule. Halogen or other substituent groups which do not interfere with the acid interchange reaction optionally may be present upon the aromatic rings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.