US 7,066,968 B2 · Efficient two-step method of coloring and lightening hair with less damage

Abstract

The present invention relates to a 2-step methods, and compositions for providing more vibrant, natural and long-lasting color to hair and at the same time reducing hair fiber damage associated with alternative current methods. In the first step the hair is contacted for a period of time with a dye precursor mixture containing specific oxidative hair dye precursors under conditions where these dyes are substantially inactive. Color is then developed in a second step by contacting the hair with a mixture of a peroxide compound and a persulfate salt. Surprisingly the 2-step method leads to considerable “lift” or lightening without negatively impacting the coloring ability of the oxidative dye. The invention also relates to kits providing the means to accomplish these steps.

Claims16

Dependent claims

A method of coloring and lightening hair to provide more vibrant, natural and long-lasting color with reduced damage comprising carrying out the following sequential steps:

(a) contacting said hair with a substantially inactive mixture of oxidative hair dye precursors wherein the rate of oxidation of hair dye precursors/rate of diffusion of hair dye precursors is less than about 1;
(b) allowing said mixture to remain in said hair for a period of about 5 minutes to about 60 minutes;
(c) contacting said hair with an aqueous developer composition comprising a mixture of a persulfate salt selected from the group consisting of sodium persulfate, potassium persulfate, ammonium persulfate and mixtures thereof, a peroxide, and a basifying compound, wherein the weight ratio of persulfate salt to peroxide is in the range from about 1 to about 4;
(d) allowing the composition in step (c) to remain on said hair for a period of about 30 seconds to about 60 minutes.

1 more element

Dependencies are inferred from the claim text.

Efficient two-step method of coloring and lightening hair with less damage

Life of this patent

Efficient two-step method of coloring and lightening hair with less damage

Life of this patent

Abstract

Claims16