Compositions suitable for use in dyeing hair obtained from the r

Details Compositions suitable for use in dyeing hair obtained from the r Compositions suitable for use in dyeing hair obtained from the r

1979-07-26

1982-02-09

Schofer, Joseph L.

Bleaching and dyeing; fluid treatment and chemical modification

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

Hair dyeing

8405, 8429, 8524, A61K 713

Patent

active

043148107

ABSTRACT:
Process for the preparation of a composition suitable for use in dyeing human hair, which composition contains a mixture of dyestuff precursors obtained by reacting at least one polyhydroxybenzene of the formula: ##STR1## and one precursor of the formula: ##STR2## which process comprises the following stages: (1) the abovementioned reaction is carried out in an anaerobic medium in a first solvent which is chosen with regard to the course of the reaction and the subsequent lyophilization;

REFERENCES:
patent: 3236734 (1966-02-01), Charle et al.
patent: 3981678 (1976-09-01), Ghilardi et al.
patent: 4054413 (1977-10-01), Feinland et al.

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