Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Reexamination Certificate
2002-02-14
2004-06-01
Gupta, Yogendra N. (Department: 1751)
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
C008S406000, C008S408000, C008S410000, C008S411000, C008S412000, C008S421000, C008S485000
Reexamination Certificate
active
06743264
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to methods and compositions for the permanent coloring of hair which provides long lasting hair color. The present invention also relates to methods for the coloring of hair which does not require the pre-mixing of hair colorant compositions and developers just prior to application, and which can avoid the staining of hands and clothes which often occurs during conventional permanent hair coloring processes.
Permanent hair color conventionally comes in two parts: a dye solution and a developer solution. In a conventional permanent hair coloring treatment, the dye solution and the developer solution are mixed and then applied to the hair, which is then left for about 25 to about 45 minutes. The hair is then rinsed with water, treated with a post treatment conditioner, and then rinsed again with water.
The application of the dye solution and the developer solution affords permanent hair coloring. However, use of this conventional method does not provide maximum color deposition or retention. In fact, in the subsequent rinse steps, a significant amount of hair color can be washed out.
It would be desirable to develop methods and compositions for permanently coloring hair that maximize the amount of hair color deposited and that minimize the amount of hair coloring that is washed out in the subsequent rinse steps.
By the methods of the present invention, durable or permanent, desired hair color, with longer lasting hair color change is achieved. Also in certain, permanent hair color embodiments of the present invention, the consumer does not have to undertake any mixing step. Also the consumer may not have to use a package which mixes two discrete compositions as they are being dispensed.
Patents and patent applications related to the field of this invention are as follows:
U.S. Pat. No. 5,525,123, discloses a hair dyeing composition based on oxidation dyestuff precursors which dyes and brightens the hair containing, besides at least one developer and at least one coupling agent, at least one metal salt and at least one ammonium compound selected from the group ammonium chloride, ammonium sulfate, ammonium carbonate, ammonium bicarbonate, and ammonium carbamate, having a pH-value between 8 and 11, preferably from 9 to 10, after admixture with an oxidizing agent in the ready-to-use preparation.
Co-owned and co-pending serial No. 09/811,920 filed Mar. 19, 2001 discloses a method for permanently dyeing hair which comprises subjecting said hair to a number of treatments, having a set time interval between each two consecutive such treatments, wherein each treatment comprises steps a.) and b.) below:
a.) contacting said hair, for a period of about 5 seconds to about 5 minutes with a recently made mixture of:
i.) an alkaline composition comprising a dye intermediate in a shampoo base or in a conditioner base; and
ii.) an acidic composition comprising an oxidating compound in a shampoo base or in a conditioner base;
b.) rinsing said mixture from said hair with water;
with the proviso that when a conditioner base is present in a.) i.) above, an independently selected conditioner base is also present in a.) ii.) above; and when a shampoo base is present in a.) i.) above, an independently selected shampoo base is also present in a.) ii.) above;
and wherein said number of treatments is between about 2 to about 30; and wherein said set time interval between each two consecutive treatments is between about 8 hours and 30 days, is described.
SUMMARY OF THE INVENTION
The invention relates to methods and compositions for achieving permanent hair color change wherein said methods comprise the following steps:
1) contacting said hair with a substantially inactive mixture of oxidative hair dye precursors (the hair colorant part) at a pH of about 8 or about 7 or below for a period of about 30 seconds to about 60 minutes; and
2) contacting said hair with an oxidizing compound (the hair color developer part) at a pH of about 8 to about 11 for a period of about 30 seconds to about 60 minutes; and
3) rinsing said hair with water.
DETAILED DESCRIPTION OF THE INVENTION
As used herein % means weight % unless otherwise indicated. When used herein % refers to weight % as compared to the total weight percent of the composition that is being discussed. For example, when % is used to discuss the amount of an ingredient that is in the hair colorant part, this means weight % as compared to the total weight of the hair colorant part. When weight % of the hair color developer part is mentioned, this means the weight % as compared to the total weight of the hair color developer part. When the ratio of the hair colorant part to the hair color developer part is discussed this means the ratio of weight % of the hair colorant part to weight % of the hair color developer part.
As used herein “inactive” or “substantially inactive” means that the oxidation hair dye precursors are not chemically reacting or are not chemically reacting to a substantial degree, so as to form coupled or polymerized hair color molecules, or it means that the oxidation hair dye precursors are not chemically reacting in a substantial manner so as to form coupled or polymerized hair color molecules.
“Hair colorant compositions of the invention” are used interchangeably with “hair coloring compositions” of the invention and “coloring compositions of the invention”. “Hair colorant compositions of the invention” refers generally to those compositions of the present invention which comprise oxidative hair dye precursors. “Hair color developer compositions of the invention” are used interchangeably with “developer compositions” of the invention. “Hair color developer compositions of the invention” refers to those compositions of the invention which include a basifying compound that serves to activate the oxidizing agent that thereby causes the coupling, reacting or polymerization of the oxidative hair dye precursors.
As will be seen below, in some embodiments of the present invention, hair color developer compositions comprise for example just a basifying compound and water; and others comprise a mixture of a basifying compound and a peroxygen compound. As used herein the term “recently” means within a very short interval of time such as within a few seconds or minutes, such as within 0.01 seconds to 120 seconds, or within 0.1 seconds to 60 seconds, or within 0.5 second to within 30 seconds or within 2 seconds to within 20 seconds. Compositions of the invention may be made by means which are known in the art or which are analogous to those which are known in the art. Ingredients which are included in compositions of the invention are known in the art or may be made by means which are known in the art.
The present invention relates to methods and compositions for achieving the permanent coloring of hair which methods comprise
1) contacting the hair with a substantially inactive mixture of oxidation hair dye precursors for a period of about 30 seconds to about 60 minutes, and then
2) contacting the hair with an oxidizing oxidative compound which causes said oxidation hair dye precursors to, react, couple, and polymerize so as to form large hair color molecules within the hair shaft; and
3) rinsing said hair with water.
The first step of the above method provides hair oxidation dye precursors with time to diffuse into the hair shaft. The second step of the above method causes the formation of larger sized hair color molecules within the hair shaft. Because of their size, these larger sized hair color molecules have a very low tendency for diffusing out of the hair shaft.
The following are two nonlimiting embodiments of methods of the present invention:
1) first, the substantially inactive mixture oxidation hair dye precursors may be applied to the hair in admixture with water and other water miscible solvents at about a neutral pH and allowed to remain on the hair for about 5 minutes to about 60 minutes;
2) then a recently made mixture of an oxidizing compound such as hydrogen peroxide, and a basif
Bartolone John Brian
Chan Alexander C.
Sarojini Padmaja
Aronson Michael P.
Elhilo Eisa
Gupta Yogendra N.
Unilever Home & Personal Care USA , division of Conopco, Inc.
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