Patent · US Expired

Process for the production of polyfunctional cyanic acid esters

US4046796A · kind A · utility

17Cited by

3References

2Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Gunther Rottloff
Rudolf Sundermann · New Martinsville, US
Ernst Grigat
Rolf Putter

Key dates

Filing date	Feb 17, 1976
Grant date	Sep 6, 1977
Priority date	—
Expiry date	Feb 17, 1996

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C261/02
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Highly pure aromatic polyfunctional cyanic acid esters having a high stability in storage and being extraordinary suitable for use as starting compound for the production of plastics by cyclopoly-trimerization are obtained by a special process. Alkaline earth and/or alkali metal salts of polyfunctional aromatic hydroxy compounds said alkaline earth and/or alkali metal compound capable of phenolate formation are used in excess of up to 0.1 mol per mol of aromatic hydroxy group are reacted with an excess of cyanogen halide. The cyanogen halide excess comprises up to 1 mol per mol of aromatic hydroxy group plus excess mol of the metal compound used for salt production.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.