PROCESS FOR DYEING KERATINOUS FIBRES WITH INDOLE DERIVATIVES COMBINED WITH AN IODIDE

摘要

Process for dyeing human keratinous fibres, consisting in applying on these fibres at least least one composition (A) containing, in a cosmetically acceptable medium, one or more indole derivatives corresponding to the formula (I) (I) in which: R1 denotes a hydrogen atom, a lower C1-C6 lower akly group or a group -SiR9R10R11; R2 and R3, which may be identical or different, denote a hydrogen atom, a C1-C6 lower alkyl group, a carboxyl group, a lower alkoxycarbonyl group wherein the alkoxy moiety contains 1 to 6 carbon atoms, or a group -COOSiR9R10R11; R4 and R5, which may be identical or different, denote a hydrogen atom, a C1-C20 linear or branched alkyl group, a formyl group, a linear or branched C2-C20 acyl group, a linear or branched C3-C20 alkenoyl group, a group -SiR9R10R11, a group -P(O) (OR6)2 or a group R6OSO2-, or alternatively R4 and R5, together with the oxygen atoms to which they are attached, form a ring optionally containing a carbonyl group, a methylene group, a thiocarbonyl group or one of the following groups; >P(O)OR6, or >CR7R8; R6 and R7 denoting a hydrogen atom or C1-C6 lower alkyl group, R8 denoting a C1-C6 lower alkoxy group or a mono- or di-C1-C6 alkylamino group, R9,R10 and R11, which may be identical or different, denoting C1-C6 linear or branched alkyl groups, and the corresponding salts of alkali metals, alkaline-earth metals and amines, at least one of the radicals R1 to R5 being other than hydrogen, in combinations: either (a) with iodide ions, or (b) with a solution of hydrogen peroxide at a pH of between 3.5 and 7, the application of the composition (A) being preceded or followed by the application of composition (B) which contains, in a cosmetically acceptable medium, either (a) hydrogen peroxide at a pH of between 2 and 7 when the composition (A) contains iodide ions, or (b) iodide ions when the composition (A) contains hydrogen peroxide.