Preparation of stable solutions of azo dyes of m-phenylenediamin

Details Preparation of stable solutions of azo dyes of m-phenylenediamin Preparation of stable solutions of azo dyes of m-phenylenediamin

1988-04-14

1990-08-28

Higel, Floyd D.

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

Organic compounds

Azo

534575, 534576, 534887, C09B 3700, C09B 6714, C09B 6734, D21H 380

Patent

active

049526804

ABSTRACT:
Stable solutions of azo dyes obtained by diazotizing and coupling m-phenylenediamine or derivatives thereof are prepared after the reaction has ended by treating the resulting reaction mixture with from 0.1 to 1.2 moles of formic acid, based on 1 mole of m-phenylenediamine, at from 60.degree. C. to the boiling point of the reaction mixture.

REFERENCES:
patent: 3310362 (1967-03-01), Fiess
patent: 3346322 (1967-10-01), Finkenbauer et al.
patent: 3696089 (1972-10-01), Raue et al.

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