Process for the preparation of azo dyes

Details Process for the preparation of azo dyes Process for the preparation of azo dyes

1995-02-16

1997-02-25

McKane, Joseph

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

Organic compounds

Azo

534565, 534578, 534579, 534580, C07C24506, C09B 2908, C09B 29095

Patent

active

056060343

ABSTRACT:
The invention discloses a process for the preparation of azo dyes using an aminodiphenylamine as diazo component. The process comprises reacting the amine, an alkali metal nitrite and a mineral acid continuously in the temperature range from 35.degree. to 65.degree. C. to give the diazo compound, using a 3 to 15% excess of alkali metal nitrite, and thereafter coupling the diazo compound to a coupling component. Azo dyes of superior quality constancy and in high yield are obtained by the novel process.

REFERENCES:
patent: 4233213 (1980-11-01), Breig et al.
patent: 4265810 (1981-05-01), Bauman et al.
patent: 4297278 (1981-10-01), Nickel
patent: 4874847 (1989-10-01), Oxenius et al.
patent: 4918168 (1990-04-01), Stepanivk et al.

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