Process for improving the storage stability of indole dyestuffs

Details Process for improving the storage stability of indole dyestuffs Process for improving the storage stability of indole dyestuffs

1978-05-09

1980-06-17

Mars, Howard T.

Bleaching and dyeing; fluid treatment and chemical modification

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

Hair dyeing

8609, 8611, A61K 713

Patent

active

042081831

ABSTRACT:
The invention relates to storage-stable dyestuff solutions which can be mixed at the time of use with appropriate carriers.
These solutions comprise at least one dihydroxyindole of the formula: ##STR1## in which R.sub.1 and R.sub.2 independently of one another denote hydrogen or methyl, or a cosmetically acceptable salt thereof, in an anhydrous solvent chosen from amongst ethyl, isopropyl and tert.-butyl alcohol, ethylene glycol monomethyl, monoethyl and monobutyl ethers and the acetate of ethylene glycol monoethyl ether.

REFERENCES:
patent: 3194734 (1965-07-01), Seemuller et al.
patent: 4013404 (1977-03-01), Parent et al.

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