Preparation of liquid formulations of basic azo dyes in carboxyl

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

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534573, 534676, 534576, 534887, 534579, 534575, C09B 29085, C09B 3700, C09B 6710, C09B 6734

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active

049239724

ABSTRACT:
Liquid formulations of basic azo dyes are prepared from unsubstituted or C.sub.1 -C.sub.4 -alkyl- or C.sub.1 -C.sub.4 -alkoxy-substituted m-phenylenediamine by diazotizing and coupling in carboxylic acid solution, which comprises performing the reaction with 0.76 to 0.95 mole of nitrile, calculated as nitrous acid and based on 1 mole of m-phenylenediamine, and then heating the resulting reaction mixture at from 60.degree. C. to the boiling point of the reaction mixture.

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patent: 3928314 (1975-12-01), Rochat et al.
patent: 4400321 (1983-08-01), Linhart et al.

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