Tinctorial composition for keratinous fibres containing oxidation dye precursors and aminoindole couplers, methods for dyeing using these compositions and new compounds

A method for dyeing keratinous fibers comprising applying to said fibers an oxidation tinctorial composition comprising, in a solvent medium suitable for dyeing said fibers, at least one para oxidation dye precursor, said para oxidation dye precursor being selected from the group consisting of a paraphenylenediamine, a para-aminophenol, a para heterocyclic precursor derived from an amino or hydroxy substituted pyridine or pyrimidine and a bis-phenylalkylenediamine, and at least one heterocyclic coupler having formula (I) ##STR12## wherein R.sub.1 and R.sub.3, each independently, represent hydrogen or C.sub.1 -C.sub.4 alkyl,

• R.sub.2 represents hydrogen, C.sub.1 -C.sub.4 alkyl, carboxyl or alkoxycarbonyl, with the proviso that at least one of R.sub.2 and R.sub.3 represents hydrogen,
• R.sub.4 represents hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 hydroxyalkyl or C.sub.2 -C.sub.4 polyhydroxyalkyl,
• the NHR.sub.4 group occupies positions 4, 6 or 7 of the benzene ring,
• or a salt thereof,
• said heterocyclic coupler being present in an amount ranging from 0.05 to 3.5 weight percent based on the total weight of said composition and said para oxidation dye precursor and said heterocyclic coupler, as a whole, being present in an amount ranging from 0.3 to 7 percent by weight based on the total weight of said composition,
• said precursor and coupler being mixed at the time of use with an oxidant in an amount sufficient to develop a coloring.

A method for dyeing keratinous fibers comprising

• in a first step applying to said fibers a first composition comprising at least one para oxidation dye precursor in a solvent medium suitable for dyeing said fibers, said para oxidation dye precursor being selected from the group consisting of a paraphenylenediamine, a para-aminophenol, a para heterocyclic precursor derived from an amino or hydroxy substituted pyridine or pyrimidine and a bis-phenylalkylenediamine and permitting said first composition to remain in contact with said fibers for a period of time ranging from 10 to 40 minutes, and
• in a second step applying to said fibers a second composition comprising in a solvent medium suitable for dyeing said fibers, at least one heterocyclic coupler having formula (I) ##STR13## wherein R.sub.1 and R.sub.3, each independently, represent hydrogen or C.sub.1 -C.sub.4 alkyl,
• R.sub.2 represents hydrogen, C.sub.1 -C.sub.4 alkyl, carboxyl or alkoxycarbonyl with the proviso that at least one of R.sub.2 and R.sub.3 represents hydrogen,
• R.sub.4 represents hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 hydroxyalkyl or C.sub.2 -C.sub.4 polyhydroxyalkyl;
• and
• the NHR.sub.4 group occupies positions 4, 6 or 7 of the benzene ring, or a salt thereof,
• and permitting said second composition to remain in contact with said fibers for a period of time ranging from 10 to 40 minutes,
• said second composition optionally containing an oxidant in an amount effective to develop a coloring or alternatively
• in a third step applying to said fibers an oxidant in an amount and for a time effective to develop a coloring.

An oxidation tinctorial composition for dyeing keratinous fibers comprising, in a solvent medium suitable for dyeing said fibers, at least one para oxidation dye precursor, said para oxidation dye precursor being selected from the group consisting of a paraphenylenediamine, a para-aminophenol, a para heterocyclic precursor derived from an amino hydroxy substituted pyridine or pyrimidine and a bis-phenylalkylenediamine and at least one heterocyclic coupler having formula (I) ##STR14## wherein R.sub.1 and R.sub.3 represent hydrogen,

• R.sub.2 represents hydrogen,
• R.sub.4 represents hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 hydroxyalkyl or C.sub.2 -C.sub.4 polyhydroxyalkyl;
• and
• the NHR.sub.4 group occupies positions 4, 6 or 7 of the benzene ring,
• or a salt thereof,
• said heterocyclic coupler being present in an amount ranging from 0.05 to 3.5 weight percent based on the total weight of said composition and said para oxidation dye precursor and said heterocyclic coupler, as a whole, being present in an amount ranging from 0.3 to 7 percent by weight based on the total weight of said composition.