Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Reexamination Certificate
2002-06-14
2004-09-14
Kopec, Mark (Department: 1751)
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
C008S406000, C008S409000, C008S450000, C008S519000
Reexamination Certificate
active
06790240
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to shaped bodies for coloring keratin fibers, which, in addition to dye precursors and oxidizing agents, additionally comprise an alkalinizing agent, to the use of these compositions for the preparation of hair-coloring preparations, and to a method of coloring keratin fibers using these shaped bodies.
Human hair is nowadays treated in many diverse ways with hair cosmetic preparations. These include, for example, cleansing of the hair using shampoos, care and regeneration using rinses and cures, and bleaching, coloring and shaping the hair using colorants, tints, waving compositions and styling preparations. In this connection, compositions for changing or shading the color of the hair on the head play a prominent role.
For temporary colorations, use is usually made of colorants or tints which comprise substantive dyes as coloring component. These are dye molecules which attach directly to the hair and do not require an oxidative process to develop the color. These dyes include, for example, henna, which has been known from antiquity for coloring body and hair. These colorations are generally significantly more sensitive toward shampooing than the oxidative colorations, meaning that an often undesired shift in shade or even a visible “decoloration” occurs very much more quickly.
For permanent intensive colorations with corresponding fastness properties, use is made of oxidation dyes. Such dyes usually comprise oxidation dye precursors, termed developer components and coupler components. The developer components form, under the influence of oxidizing agents or of atmospheric oxygen among themselves, or with coupling with one or more coupler components, the actual dyes. The oxidation dyes are characterized by excellent, long-lasting color results. For natural colorations, it is usually necessary to use a mixture of a relatively large number of oxidation dye precursors; in many cases, substantive dyes are also used for shading.
Finally, a novel coloring process has recently attracted significant attention. In this process, precursors of the natural hair dye melanin are applied to the hair; these then develop nature-analogous dyes within the scope of oxidative processes within the hair. Such a process using 5,6-dihydroxyindoline as dye precursor has been described in EP-B1-530 229. The application, in particular repeated application, of compositions comprising 5,6-dihydroxyindoline enables people with gray hair to regain their natural hair color. The coloration can be developed here with atmospheric oxygen as the sole oxidizing agent, meaning that recourse does not have to be made to further oxidizing agents. In people with originally mid-blond to brown hair, the indoline can be used as the sole dye precursor. For application in the case of people with an originally red and, in particular, dark to black hair color, satisfactory results can, by contrast, often only be achieved through the co-use of further dye components, in particular specific oxidation dye precursors.
Hair colorants are usually formulated in the form of aqueous emulsions or color gels which, where appropriate, are mixed with an oxidizing agent preparation directly prior to application. However, this process could still be improved upon with regard to the storage stability of the formulations, the dosability and ease of handling.
JP-B-46-004280 has proposed the formulation of hair colorants in the form of a tablet, where the color preparation comprising the dye, and the oxidizing agent preparation are not in contact. It has been proposed that the hair coloring components and the oxidizing agent preparation be separated by an inert interlayer, for example made of Avicel, starch or cellulose derivatives. Tablets are usually to be heavily compressed in order to prevent them from breaking apart or being heavily abraded during preparation, storage and transportation. However, the color result which can be achieved with these shaped bodies is still inferior to the color performance of conventional two-component systems, and this form of formulation has hitherto not successfully penetrated the market.
The object was therefore to optimize the color shaped bodies with regard to their coloring properties and their dissolution behavior.
Surprisingly, it has now been found that, by using an additional alkalinizing agent, the colorations which can be achieved can be significantly improved with regard to their intensity and fastness properties, and the shaped bodies are characterized by a significantly reduced dissolution time.
SUMMARY OF THE INVENTION
The present invention firstly therefore provides shaped bodies for coloring keratin fibers, which comprise, in a cosmetically acceptable carrier, at least one dye precursor, at least one oxidizing agent and additionally at least one alkalinizing agent.
DETAILED DESCRIPTION OF THE INVENTION
Keratin fibers are to be understood according to the invention as meaning furs, wool, feathers and, in particular, human hair. Although the shaped bodies according to the invention are primarily suitable for coloring keratin fibers, nothing in principle opposes a use in other fields.
Alkalinizing Agents
In principle, the alkalinizing agents are not subject to any limitations. Suitable alkalinizing agents are, for example, ammonium salts; carbonates, amino acids, alkali metal hydroxides or alkaline earth metal hydroxides and organic amines.
In a preferred embodiment of the present invention, solid alkalinizing agents are used.
In a further embodiment of the present invention, it may be preferred to use alkalinizing agents characterized by good solubility in water. According to the invention, readily water-soluble compounds are compounds of which at least 5 g dissolve in 100 ml of water at 15° C. Particular preference is given to compounds with a solubility in water of more than 7.5 g in 100 ml of water at 15° C.
In addition, the alkalinizing agents which develop only a slight partial pressure outside of the shaped body following their incorporation into the shaped bodies according to the invention have proven particularly preferred.
In a preferred embodiment of the present invention, the alkalinizing agents used are amino acids or oligopeptides with at least one amino group and a carboxyl or a sulfo group whose 2.5% strength aqueous solution has a pH of greater than 9.0.
Within the scope of this embodiment, aminocarboxylic acids are particularly preferred, in particular &agr;-aminocarboxylic acids and &ohgr;-aminocarboxylic acids. Of the &agr;-aminocarboxylic acids, particular preference is given in turn to lysine and, in particular, to arginine.
The amino acids can be added to the shaped bodies according to the invention preferably in free form. In a number of cases, however, it is also possible to use the amino acids in salt form. Preferred salts are then the compounds with hydrohalic acids, in particular the hydrochlorides and the hydrobromides.
Furthermore, the amino acids can also be used in the form of oligopeptides and protein hydrolysates, if it is ensured that the required amounts of the amino acids used according to the invention are present therein. In this connection, reference is made to the disclosure of DE-A 22 15 303, to which reference is expressly made.
A very particularly preferred alkalinizing agent is arginine, in particular in free form, but also used as hydrochloride since, in addition to its alkaline properties, it also significantly increases the penetration ability of the dyes.
The alkalinizing agent is present in the shaped bodies according to the invention preferably in amounts of from 0.5 to 20% by weight, in particular from 5 to 15% by weight, based on the total composition.
Oxidizing Agents
Although the choice of oxidizing agent is in principle not subject to any limitations, it may be preferred according to the invention to use addition products of hydrogen peroxide, in particular onto urea, melamine or sodium borate, as oxidizing agents. The use of percarbamide is particularly preferred.
In addition, it i
Bossmann Britta
Dreja Michael
Hollenberg Detlef
Schulze zur Wiesche Erik
Elhilo Eisa
Harper Stephen D.
Henkel Kommanditgesellschaft aug Aktien
Hill Gregory M.
Kopec Mark
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