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US 5,516,942 AGranted
Hydroxyethylated 2-nitro-p-phenylenediamines and use thereof for dyeing keratin fibers
AssigneeL'oreal
InventorsAlain Lagrange, Alex Junino, Alain Genet, Jean Cotteret
Life of this patent
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Abstract
A N1,N4-dihydroxyethylated 2-nitro-p-phenylenediamine of formula (I), wherein R is C3-4 aklyl, and cosmetically acceptable salts thereof, for use in direct dyeing to give blue through purple shades which are wash-fast, light-fast, weatherproof and sweat resistant, and optionally combined with yellow and optionally read or orange-coloured dyes to give natural hues.
Claims21
N.sup.1,N.sup.4 -Dihydroxyethylated 2-nitro-p-phenylenediamine having the formula:
- ##STR2## in which R represents a linear or branched alkyl radical containing 3 or 4 carbon atoms, and the cosmetically acceptable salts of this compound.
Dependencies are inferred from the claim text.