Dye composition containing diphenylamine and polyhydroxybenzene

Claim 1

A hair dye composition comprising an aqueous solution of at least one diphenylamine having the formula ##STR8## wherein R' 1 and R' 4 each independently represent hydrogen, halogen, lower alkyl, lower alkoxy, acylamino or ureido; R' 2 and R' 3 each independently represent hydrogen, halogen, lower alkyl, lower alkoxy, amino, amino mono- or di-substituted by lower alkyl, N-hydroxy alkylamino, acylamino, N-carbamylalkylamino, ureido or N-carbalkoxyamino; R 5 , r 6 , r 7 and R 8 each independently represent hydrogen, halogen, lower alkyl or lower alkoxy; Y represents hydroxy or amino; and Z represents hydroxy or ##STR9## wherein R 9 and R 10 each independently represent hydrogen, lower alkyl, hydroxyalkyl, carbamylalkyl, aminoalkyl, mono- or di-alkylaminoalkyl, acylaminoalkyl, alkylsulfonamidoalkyl, arylsulfonamidoalkyl, sulfoalkyl, piperidinoalkyl or morpholinoalkyl, or a salt thereof; and a polyhydroxybenzene or a salt thereof, said diphenylamine being a leucoderivative of an indoamine having an oxidation-reduction potential between -450 and -350 mv measured at a pH of 10 in a 25% ethanol solution in water, said polyhydroxybenzene or the salt thereof having an oxidation-reduction potential between -600 and -300 mv measured at a pH of 10 in water, and said polyhydroxybenzene having the formula ##STR10## wherein R 1 represents hydroxy or ##STR11## wherein R 3 represents hydrogen or alkyl and R 2 represents hydrogen, or NH 2 when R 1 represents NH 2 ; said diphenylamine being present in an amount sufficient to dye said keratinic fibers and said polyhydroxybenzene being present in an amount such that the ratio of the total moles of the diphenylamine to the number of moles of polyhydroxybenzene is between 2 and 7.