Process for preparing acid nitro dyestuffs for leather

Details Process for preparing acid nitro dyestuffs for leather Process for preparing acid nitro dyestuffs for leather

1984-08-23

1986-05-27

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dyeing involving animal-derived natural fiber material ,...

Leather dyeing

8649, 564431, 564433, 564441, 564442, D06P 332, C07C 8750

Patent

active

045913595

ABSTRACT:
Acid nitrodyestuffs are prepared by treating aminonitrodiphenylaminesulfonic acids with an oxidizing agent in an aqueous medium, the oxidizing agent being hypochlorous acid or its alkali metal or alkaline earth metal salts and the reaction taking place at above pH 4 and at a temperature between 0.degree. and 100.degree. C. The dyestuffs thus obtainable dye even fresh full chrome grained leather in deep shades.

REFERENCES:
patent: 1059571 (1913-04-01), Schmidlin
patent: 1711860 (1929-05-01), Schmidlin

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