Patent ID: 6090160
Filing Date: 2000-07-18
Classification: A61K,A61Q

Abstract:
In a tinctorial composition for dyeing keratinous fibers which comprises, in a medium suitable for dyeing said fibers, at least one oxidation dyestuff precursor selected from the group consisting of a paraphenylene diamine having the formula ##STR8## wherein R.sub.4, R.sub.5 and R.sub.6, each independently represent hydrogen, halogen, an alkyl having 1-4 carbon atoms or alkoxy having 1-4 carbon atoms, andR.sub.7 represents hydrogen, alkyl, carbamylalkyl, mesylaminoalkyl, acetylaminoalkyl, ureidoalkyl, carbalkoxyaminoalkyl, piperidinoalkyl or morpholinoalkyl, wherein said alkyl and alkoxy moieties have 1-4 carbon atoms,and the salt of said paraphenylenediamine, a para-aminophenol, a para-heterocyclic oxidation dye precursor, a bis-phenyl alkylene diamine, an ortho-aminophenol and an ortho-phenylenediamene, and at least one oxidizing agent containing hydrogen peroxide, the improvement comprising including in said composition at least one heterocyclic coupler having the formula ##STR9## wherein R.sub.1 represents hydrogen or C.sub.1 -C.sub.4 alkyl, R.sub.2 and R.sub.3, each independently, represent hydrogen, C.sub.1 -C.sub.4 lower alkyl, carboxyl or alkoxycarbonyl, X represents C.sub.1 -C.sub.4 lower alkyl, C.sub.1 -C.sub.18 alkoxy, halogen, C.sub.1 -C.sub.20 acyloxy, acetylamino, trimethylsilyloxy or di(C.sub.1 -C.sub.4) alkylaminomethyl,the OH group occupying the 6- or 7-positions,and the salts thereof,said heterocyclic coupler being present in an amount ranging from 0.05 to 3.5 percent by weight based on the total weight of said composition,the combined total weight of said oxidation dyestuff precursor and said heterocyclic coupler ranging from 0.3 to 7 weight percent based on the total weight of said composition,said composition being free of any iodide ions in an amount capable of oxidizing said oxidation dyestuff precursor and said heterocyclic coupler of formula I.