Lyophilized and spray dried dyes

Details Lyophilized and spray dried dyes Lyophilized and spray dried dyes

1974-04-15

1976-06-01

Schenkman, Leonard

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 102, A61K 712, A61K 713

Patent

active

039604764

ABSTRACT:
A process for producing a dye in powder form involves reacting an oxidation agent with an oxidation base in an aqueous alkaline preferably ammoniacal medium having a pH ranging from 8 to 13 at a temperature and during a period of time allowing at least a partial oxidation, preferably between 15.degree.-30.degree.C for a period of about 5 minutes to 30 hours and lyophilizing or spray-drying the resulting reaction product. The resulting dye can be used to color keratinic fibers, especially human hair.

REFERENCES:
patent: 2875769 (1959-03-01), Rosmarin et al.
patent: 3337411 (1967-08-01), Wilmsmann
patent: 3415608 (1968-12-01), Tucker
patent: 3563684 (1971-02-01), Charle et al.

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