Hair dye compositions and methods utilizing 2-substituted-1-naphthol couplers
AssigneeClairol Incorporated
InventorsAlexander Chan, Yuh-Guo Pan, Mu-Ill Lim, Richard Demarco
Life of this patent
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Abstract
2-substituted-1-naphthols when coupled with an oxidation dye precursor in an oxidative dye system produce a long lasting intense color to hair. Use of such couplers makes available to the colorist novel oxidation hair dyes which surprisingly show a color shift to the red. Dyestuffs prepared through use of the 2-substituted-1-naphthol couplers are substantially more acid-fast compared to like dyestuffs using a 1-naphthol coupler. Compositions and a method of dyeing hair are also disclosed.
Claims14
In an oxidative dye composition for dyeing a keratin fiber, the composition containing an oxidation dye precursor, a coupler, at least one material selected from the group consisting of perfumes, antioxidants, sequestering agents, alkalizing agents, acidifying agents and developers and a cosmetically acceptable vehicle, the precursor and the coupler being present in respective amounts such that when the precursor is activated it reacts with the coupler to produce a tinctorially effective amount of a dye compound, the improvement which comprises the coupler is a 2-substituted-1-naphthol compound having the formula I ##STR4## or a salt thereof, wherein R is C.sub.1 -C.sub.6 alkyl, hydroxy C.sub.1 -C.sub.6 alkyl, amino C.sub.1 -C.sub.6 alkyl wherein the amino group is substituted by R.sup.1 and R.sup.2, R.sup.1 and R.sup.2 being independently selected from the group consisting of hydrogen, C.sub.1 -C.sub.6 alkyl, hydroxy C.sub.1 -C.sub.6 alkyl, or R.sup.1 and R.sup.2 taken together with the nitrogen atom to which they are attached forming a 5 or 6 membered saturated ring, or an olefinic group selected from the group consisting of ethylene, propylene and butylene, and X is hydrogen or halogen.
In a method for dyeing hair including the steps of activating an oxidation dye precursor, reacting the activated oxidation dye precursor with a coupler to produce a tinctorially effective amount of a hair dye and applying the hair dye to a hair fiber;
- the improvement which comprises the coupler is a 2-substituted-1-naphthol compound having the formula I ##STR7## or a salt thereof, wherein R is C.sub.1 -C.sub.6 alkyl, hydroxy C.sub.1 -C.sub.6 alkyl, amino C.sub.1 -C.sub.6 alkyl, wherein the amino group is substituted by R.sup.1 and R.sup.2, R.sup.1 and R.sup.2 being independently selected from the group consisting of hydrogen, hydroxy C.sub.1 -C.sub.6 alkyl, or R.sup.1 and R.sup.2 taken together with the nitrogen atom to which they are attached forming a 5 or 6 membered saturated ring, or an olefinic group selected from the group consisting of ethylene, propylene and butylene, and X is hydrogen or halogen, whereby said hair fiber is imparted a coloration having increased resistance to shampooing.
Dependencies are inferred from the claim text.