Dye compositions for keratinous fibers based on para-phenylenediamines, metaphenylenediamines and benzimidazole derivatives, and dyeing process implementing them.

摘要

Use of benzimidazole derivatives as couplers for the ionization coloration of keratinous fibers and in particular human hair, in the presence of at least one meta-phenylenediamine and at least one para-oxidation dye precursor and / or ortho, the benzimidazole derivative corresponding to the formula: ## STR3 ## in which: R 1 represents a hydrogen atom or a C 1 -C 4 alkyl radical; C4; R 2 represents a hydrogen atom or a C 1 -C 4 alkyl radical or a phenyl radical; R3 represents a hydroxyl, amino or methoxy radical; R4 represents a hydrogen atom, a hydroxyl or methoxy radical or a C1-C4 alkyl radical; BR/ provided that: BR/ - when R3 denotes NH2, it occupies the position 4; BR/ - when R3 is in position 4, R4 is in position 7; BR/ - when R3 is in position 5, then R4 is in position 6. / P