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US 6,743,264 B2Granted
Two step permanent coloring of hair
AssigneeUnilever Home & Personal Care USA, Division of Conopco, Inc.
InventorsPadmaja Sarojini, John Brian Bartolone, Alexander C. Chan
Life of this patent
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Abstract
A method for treating hair which comprises: first contacting said hair with a substantially inactive mixture of oxidative hair dye precursors; and allowing said mixture to remain in said hair for a period of about 30 seconds to about 60 minutes; followed by contacting said hair with a developer to achieve long lasting hair color change, is described.
Claims21
A method for treating hair which comprises:
- (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 <1;
- (b) allowing said mixture to remain in said hair for a period of about 30 seconds to about 60 minutes;
- (c) contacting said hair with a composition comprising an oxidizing compound, a basifying compound, or mixtures thereof;
- (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
A kit for permanently coloring hair which comprises:
- a) a hair colorant composition comprising oxidative dye precursors in a container,
- b) a hair color developer composition in a container, and
- c) written instructions that direct that the hair colorant part is applied to the hair as a substantially inactive mixture for about 30 seconds to about 60 minutes before the hair color developer is applied to the hair,
- wherein the hair dye precursors of the hair colorant composition satisfies the condition that the rate of oxidation of hair dye precursors/rate of diffusion of hair dye precursors <1 when hair colorant composition is applied to the hair before the hair is contacted with the hair color developer composition.
1 more element
Dependencies are inferred from the claim text.