Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Reexamination Certificate
2002-06-14
2004-09-28
Kopec, Mark (Department: 1751)
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
C008S406000, C008S437000, C008S454000
Reexamination Certificate
active
06797012
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to shaped bodies for coloring keratin fibers, which comprise at least one synthetic substantive dye, 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.
DE-A-36 09 962 has proposed a tablet-shaped colorant based on henna and oxidation dye precursors which is said to permit intensive black coloration for an extremely short contact time. However, this specification gives no information of any kind relating to the coloring shaped bodies according to the invention.
The object was therefore to optimize the tinting shaped bodies with regard to the dissolution behavior and the rheology of the application mixture and also the coloring properties.
Surprisingly, it has now been found that, by using the shaped bodies of the invention, 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 synthetic substantive dye.
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.
Synthetic Substantive Dyes
In principle, all substantive dyes can be used according to the invention. Nitro dyes have proven particularly suitable. According to the invention, nitro dyes are to be understood as meaning the coloring components which have at least one aromatic ring system which carries at least one nitro group.
Particularly preferred nitro dyes are HC Yellow 2, HC Yellow 4, HC Yellow 5, HC Yellow 6, HC Yellow 12, HC Orange 1, HC Red 1, HC Red 3, HC Red 10, HC Red 11, HC Red 13, HC Red BN, HC Blue 2, HC Blue 12, HC Violet 1 and also 1,4-diamino-2-nitrobenzene, 2-amino-4-nitrophenol, 1,4-bis(&bgr;-hydroxyethyl)amino-2-nitrobenzene, 3-nitro-4-(&bgr;-hydroxyethyl)aminophenol, 2-(2′-hydroxyethyl)amino-4,6-dinitrophenol, 1-(2′-hydroxyethyl)amino-4-methyl-2-nitrobenzene, 1-amino-4-(2′-hydroxyethyl)amino-5-chloro-2-nitrobenzene, 4-amino-3-nitrophenol, 1-(2′-ureidoethyl)amino-4-nitrobenzene, 4-amino-2-nitrodiphenylamine-2′-carboxylic acid, 6-nitro-1,2,3,4-tetrahydroquinoxaline, picramic acid and salts thereof, 2-amino-6-chloro-4-nitropenol, 4-ethylamino-3-nitrobenzoic acid and 2-chloro-6-ethylamino-1-hydroxy-4-nitrobenzene.
In addition to the nitro dyes, the azo dyes, anthraquinones or naphthoquinones are also synthetic substantive dyes preferred in accordance with the invention.
Preferred substantive dyes of this type are, for example, Disperse Orange 3, Disperse Blue 3, Disperse Violet 1, Disperse Violet 4, Acid Violet 43, Disperse Black 9 and Acid Black 52 and 2-hydroxy-1,4-naphthoquinone.
In addition, it may be preferred according to the invention if the synthetic substantive dye carries a cationic group. Particular preference is given to
(i) cationic triphenylmethane dyes,
(ii) aromatic systems which are substituted by a quaternary nitrogen group, and
(iii) substantive dyes which contain a heterocycle which has at least one quaternary nitrogen atom.
Examples of dyes of class (i) are, in particular, Basic Blue 7, Basic Blue 26, Basic Violet 2 and Basic Violet 14.
Examples of dyes of class (ii) are, in particular, Basic Yellow 57, Basic Red 76, Basic Blue 99, Basic Brown 16 and Basic Brown 17.
Examples of dyes of class (iii) are disclosed, in particular, in EP-A2-998 908, to which reference is expressly made at this point.
Preferred cationic substantive dyes of group (iii) are, in particular, the following compounds:
The compounds of the formulae (DZ1), (DZ3) and (DZ5) are very particularly preferred cationic substantive dyes from group (iii).
The shaped bodies according to the invention comprise the direct dyes preferably in an amount of from 0.01 to 20% by weight.
Alkalinizing Agents
Although the shaped bodies according to the invention can, upon dissolution, produce application preparations which are weakly acidic, neutral or else alkaline, the shaped bodies comprise at least one alkalinizing agent in a preferred embodiment.
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 comp
Dreja Michael
Hollenberg Detlef
Schulze zur Wiesche Erik
Elhilo Eisa
Harper Stephen D.
Henkel Kommanditgesellschaft auf Aktien
Hill Gregory M.
Kopec Mark
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