Preparation of liquid formulations of basic azo dyes in carboxyl

Details Preparation of liquid formulations of basic azo dyes in carboxyl Preparation of liquid formulations of basic azo dyes in carboxyl

1988-04-14

1990-05-08

Higel, Floyd D.

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

Organic compounds

Azo

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

Patent

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.

REFERENCES:
patent: 2007382 (1935-07-01), Ockman et al.
patent: 2022606 (1935-11-01), Smith
patent: 3346322 (1967-10-01), Finkenauer et al.
patent: 3696089 (1972-10-01), Raur et al.
patent: 3928314 (1975-12-01), Rochat et al.
patent: 4400321 (1983-08-01), Linhart et al.

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