The invention concerns a dyeing composition for keratinous fibres, in particular human keratinous fibres and more particularly hair, comprising a dicationic diazo dye of formula (I), as well as the dyeing composition using same. The invention also concerns the novel compounds of formula (I).
A subject-matter of the present invention is the use, in the direct dyeing of keratinous fibers, of at least one direct dye and of a specific cationic hydrotropic agent of formula: ##STR00001## in which X represents CH or N.sup.+R.sub.6 with R.sub.6 representing a C.sub.1-C.sub.10 alkyl, R.sub.1 represents either a hydrogen or a C.sub.1-C.sub.10 alkyl, if X represents N.sup.+R.sub.6, or (CH.sub.2).sub.nN.sup.+R.sub.3R.sub.4R.sub.5 with R.sub.3, R.sub.4 and R.sub.5, which are identical or different, representing a C.sub.1-C.sub.10 alkyl and n representing an integer between 0 and 12, if X represents CH; R.sub.2 represents a C.sub.1-C.sub.4 alkyl; p has a value 0 or 1; the electrical neutrality of the compound being provided by a cosmetically acceptable anion or a mixture of cosmetically acceptable anions. The invention likewise relates to a dyeing composition comprising at least one dye and such a cationic hydrotrope and to colouring processes employing this dyeing composition.
The present disclosure relates to a composition for dyeing human keratin fibers, comprising at least one cationic direct dye of formula (I), described herein, and at least one cosmetic agent chosen from thickening agents and surfactants. Also disclosed herein is a dyeing process comprising applying a composition of the present disclosure to keratin fibers, in the presence or absence of an oxidizing agent. Further disclosed herein is a multi-compartment device comprising at least one first compartment containing a dye composition of the present disclosure and at least one second compartment containing at least one oxidizing composition.
The present disclosure relates to symmetrical cationic diazo compounds of formula (I), the resonance forms, and also the acid addition salts and/or the solvates thereof: ##STR00001## The present disclosure further relates to dyeing compositions comprising such compounds as a direct dye in a medium appropriate for the dyeing of keratin fibers, and also to a method of coloring keratin fibers that employs this composition, and a multi-compartment kit containing such compositions.
The present disclosure relates to symmetrical cationic diazo compounds of formula (I) below, their resonance forms, and also their acid addition salts and their solvates: ##STR00001## wherein W.sub.1 radicals, which are identical, are chosen from a halogen atom, or an --NR.sub.4-Ph-NR.sub.5R.sub.6, --NR.sub.4-Ph-OR.sub.7, --O-Ph-OR.sub.7 or --O-Ph-NR.sub.5R.sub.6 group or else an --NR.sub.5R.sub.6 or --OR.sub.7 group with certain provisos; L, a non-cationic linker connecting the two identical azo chromophores, is chosen from a covalent bond; an optionally substituted C.sub.1-C.sub.40 alkyl radical optionally interrupted by a (hetero)cycle, the alkyl radical being optionally interrupted by at least one heteroatom or group comprising at least one heteroatom or an optionally substituted phenyl radical.The disclosure further relates to dyeing compositions comprising such compounds as a direct dye in a medium appropriate for the dyeing of keratin fibers, and also to a method of coloring keratin fibers that employs this composition, and a device comprising a plurality of compartments.
Disclosed herein are symmetrical cationic diazo compounds chosen from compounds of formula (I), their resonance forms, their acid addition salts, and their solvates: ##STR00001## Also disclosed herein are dyeing compositions comprising such compounds as a direct dye in a medium appropriate for the dyeing of keratin fibers, a method of coloring keratin fibers comprising contacting the keratin fibers with such compositions, and a device comprising a plurality of compartments.
