Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Leather dyeing
Patent
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
Clingman A. Lionel
Hoechst Aktiengesellschaft
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