Process for the production of cyclic carboxylic acid imides
US3966726A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1972 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Sep 8, 1992 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D471/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In a process for reacting an aromatic or hydroaromatic alicyclic or heterocyclic dicarboxylic acid or its anhydride with an aliphatic or aromatic alicyclic or heterocyclic mono- or di-amine to produce an N-substituted dicarboxylic acid imide with a splitting off of water, the improvement of carrying out the reaction in a liquid solvent mixture consisting essentially of a non-polar organic solvent and a strongly polar organic solvent which together form a ternary azeotrope with water at reaction temperatures between about 40.degree.C. and 160.degree.C. The imide products are generally known for use as intermediates and final products in a number of industries.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.