Lyophilized dyes and the use thereof to color keratinic fibers

Details Lyophilized dyes and the use thereof to color keratinic fibers Lyophilized dyes and the use thereof to color keratinic fibers

1973-06-25

1976-09-21

Padgett, Benjamin R.

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 10, 8 101, 8 102, 8 19, 8 25, 8 32, 8 79, 8 93, A61K 712

Patent

active

039816788

ABSTRACT:
A process for producing a dye in powder form involves reacting an oxidation agent with an oxidation base in an aqueous alkaline medium, preferably an ammoniacal medium, having a pH ranging from 8 to 13, in the presence of an organic solvent for the dye being produced, 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 the resulting reaction product. The resulting dye can be used to color keratinic fibers, especially human hair.

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patent: 3698852 (1972-10-01), Pantzer et al.
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patent: 3899288 (1975-08-01), Galerne
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patent: 3929403 (1975-12-01), Kalopissis et al.
P-Benzoquinonediimine -- A Vital Intermediate in Oxidative Hair Dyeing, J. F. Corbett, J. Soc. Cosmetic Chemists, vol. 20, No. 4, pp. 253-263 (Apr. 1969).

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