Process for the preparation of mono- and polyazo dyes

Details Process for the preparation of mono- and polyazo dyes Process for the preparation of mono- and polyazo dyes

1990-09-25

1992-05-26

Cintins, Marianne

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

534683, 534685, 534688, C09B 2700

Patent

active

051169550

ABSTRACT:
There is disclosed a process for coupling one or more different diazo components with resorcinol on an industrial scale. The process comprises adjusting and stabilizing the coupling pH of the resorcinol prior to the reaction with the aid of a buffer system and keeping it constant during the coupling reaction or reactions by controlling the ratio of flow of the streams of the diazo component or components and the base. The process makes it possible to prepare mono- and polyazo dyes in excellent uniform quality and yield.

REFERENCES:
patent: 3189593 (1985-06-01), Wicki et al.
patent: 4521216 (1985-06-01), Armbrust
patent: 4638055 (1987-01-01), Bergmann et al.
H. R. Schweizer, Kunstliche Organische Farbstaffe Springer-Verlag (1964) pp. 422 & 423.
57th Handbook of Chemistry & Physics (1976-1977) pp. D133-D135.

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