Dye composition using a phenol-derived coupler in a medium rich in fatty substances, processes and devices

Abstract

The present invention relates to a composition for dyeing keratin fibres, comprising: at least one fatty substance, at least one surfactant; at least one oxidation base, at least one coupler of formula (B3) below and also salts thereof, optical and geometrical isomers and tautomers thereof, and hydrates thereof: (B3) in which; R, R, Rrepresent a hydrogen; a C-Calkyl or alkenyl, —SR or —OR; a (C-C)alkylcarbonyl; hydrocarbonyl; sulphonic or carboxylic acid; R, Rrepresent a hydrogen, a C-Calkyl or alkenyl; —OR'; two groups chosen from R, R, R, R, Rand borne by adjacent carbon atoms may form, together with said carbon atoms, a ring or a heterocycle which is optionally substituted, and which is optionally interrupted with one or more carbonyl groups; at least one of the radicals R, R, Rrepresenting a hydrogen; at least one of the radicals Ror Rdenoting a group —OR′ with R′ representing a C-Calkyl or alkenyl, it being possible for this radical to form, with the carbon atom bearing it, one of the neighbouring carbon atoms and its substituent, a heterocycle; at least one alkalinizing agent; the fatty substance content representing in total at least 25% by weight relative to the total weight of the composition. The present invention also relates to a process using this composition in the presence of at least one chemical oxidizing agent, and to multicompartment devices suitable for the implementation of the invention.