Preparation of N-substituted oligo-imides
US4225497A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1979 |
| Grant date | Sep 30, 1980 |
| Priority date | — |
| Expiry date | Jan 31, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1021
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
N-substituted oligo-imides of the formula: ##STR1## in which D represents a divalent radical selected from the group comprising: ##STR2## in which m is 0 or 1, Y is hydrogen, chlorine or methyl, n is a positive integer of 5 or less, and R is an organic radical of valency n, containing up to 50 carbon atoms, are prepared by reacting an anhydride of the formula: ##STR3## with an amine of the formula: EQU R--NH.sub.2).sub.n [III] in which formulae D, R, and n as above defined, said reaction being carried out in the presence of a catalyst system comprising a mixture of a compound (.alpha.) and a compound (.beta.), being a strong inorganic or organic oxygen-containing acid and (.beta.) being a salt of such acid with a cation selected from the group comprising pyridinium, quaternary phosphonium and tertiary sulfonium cations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.