Process for the production of polyfunctional cyanic acid esters
US4028393A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1976 |
| Grant date | Jun 7, 1977 |
| Priority date | — |
| Expiry date | Feb 17, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2603/94
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Highly pure aromatic polyfunctional cyanic acid esters having a high stability in storage and being extraordinarily suitable for use as starting compound for the production of plastics by cyclopoly-tri-merization are obtained by a special process. A di- or polytrialkyl ammonium phenolate of the formula: ##STR1## in which Ar represents an optionally substituted aromatic radical, PA1 R.sub.1, r.sub.2 and R.sub.3 are the same or different and each represents a linear or branched alkyl radical, and PA1 n is a number from 2 to 6, Is reacted at a temperature in the range of from -40.degree. to +65.degree. C in the presence of a trialkyl amine and an organic solvent with an excess of cyanogen halide. The excess of cyanogen halide is up to 80% by weight, based on the total weight of the phenolate and the trialkyl amine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.