WO2000038631A1 - Agent for dying keratin fibers - Google Patents

Abstract

The invention relates to an agent for dying keratin fibers, especially human hair, containing a naphthyl-azo-compound with formula (I), in which R<1> represents hydrogen, halogen, a sulfo group, nitro group, and an arylazo group. R<2> represents a phenyl group or a naphthyl group, which can be substituted by halogen, hydroxy groups, amino groups, sulfo groups, carboxy groups, nitro groups or by C1-C4-alkoxy groups; M represents hydrogen, an alkali metal or 1/2 alkaline-earth metal, 1/3 Al(III), 1/2 Zn(II), 1/4 Ti(IV), 1/4 Zr(IV), 1/3 Cr(III), 1/2 Co(II), 1/2 Fe(II), 1/3 Mo(III) or 1/6 Mo(VI), 1/3 W(III) or 1/6 W(VI) or ammonium.

Description

 "Means for dyeing fibers containing keratin"

The invention relates to an agent for dyeing keratin-containing fibers, in particular human hair, which contains certain naphthyl-azo compounds, the use of these compounds as a coloring component in hair dye compositions and a process for dyeing keratin-containing fibers, in particular human hair.

For dyeing keratin fibers, e.g. B. hair, wool or fur, generally either direct dyes or oxidation dyes, which are formed by oxidative coupling of one or more developer components with one another or with one or more coupler components, are used. Coupler and developer components are also referred to as oxidation dye precursors.

Primary aromatic amines with a further free or substituted hydroxyl or amino group in the para or ortho position, diaminopyridine derivatives, heterocyclic hydrazones, 4-aminopyrazolone derivatives and 2,4,5,6-tetraaminopyrimidine and derivatives thereof are usually used as developer components.

Specific representatives are, for example, p-phenylenediamine, p-toluenediamine, 2,4,5,6-tetraaminopyrimidine, p-aminophenol, N, N-bis- (2-hydroxyethyl) -p-phenylenediamine, 2- (2.5 -Diaminophenyl) -ethanol, 2- (2,5-diaminophenoxy) -ethanol, 1-phenyl-3-carboxyamido-4-amino-pyrazolon-5, 4-amino-3-methylphenol, 2-amino-methyl-4- aminophenol, 2-hydroxymethyl-4-aminophenol, 2-hydroxy-4,5,6-triaminopyrimidine, 2,4-dihydroxy-5,6-d. aminopyrimidine and 2,5,6-triamino-4-hydroxypyrimidine. The coupler components naphtha are usually in ^~ m-phenylenediamine, thole, resorcinol and resorcinol derivatives, pyrazolones, m-aminophenols and substituted pyridine derivatives used. Particularly suitable coupler substances are α-naphthol, 1,5-, 2,7- and 1,7-dihydroxynaphthalene, 5-amino-2-methylphenol, m-aminophenol, resorcinol, resorcinol monomethyl ether, m-phenylenediamine, 2,4 -Diaminophenoxyethanol, 2-amino-4- (2-hydroxyethylamino) anisole

(Lehmanns Blau), 1-phenyl-3-methyl-pyrazolon-5, 2,4-dichloro-3-aminophenol, 1,3-bis (2,4-diaminophenoxy) propane, 2-chlororesorcinol, 4-chlororesorcinol , 2-chloro-6-methyl-3-aminophenol, 2-methylresorcinol, 5-methylresorcinol, 3-amino-6-methoxy-2-methylamino-pyridine and 3,5-diamino-2,6-dimethoxypyridine.

With regard to other conventional dye components, reference is expressly made to the "Dermatology" series, edited by Ch. Culnan, H. Maibach, Marcel Dekker Inc., New York, Basel, 1986, Vol. 7, Ch. Zviak, The Science of Hair Care, Cape. 7, pages 248 - 250 (direct dyes), and chap. 8, pages 264 - 267 (oxidation dyes), as well as the "European Inventory of Cosmetic Raw Materials", 1996, published by the European Commission, available in disk form from the Federal Association of German Industrial and Commercial Enterprises for Medicines, Health Care Products and Personal Care Products, Mannheim .

With oxidation dyes intensive dyeings can be achieved with good fastness properties, but the development of the color is usually done under the influence of oxidizing agents such. B. H ₂ 0 ₂ , which in some cases can result in damage to the fiber. Furthermore, some oxidation dye precursors or certain mixtures of oxidation dye precursors can sometimes have a sensitizing effect on people with sensitive skin. Direct dyes are applied under gentler conditions, but their disadvantage is that the dyeings often have inadequate fastness properties. The use of the combination of naphthyl-azo compounds with special metal salts of the 2nd or 3rd main group of the periodic table and / or salts of the transition metals for dyeing keratin fibers described below is not yet known.

The object of the present invention is to provide colorants for keratin fibers, in particular for human hair, which are qualitatively at least equivalent to the usual oxidation hair colorants in terms of color depth, gray coverage and fastness properties, but without necessarily relying on oxidizing agents such as e.g. B. H ₂ 0 _{2 to be} instructed. In addition, the colorants may have no or only a very low sensitization potential.

Surprisingly, it has now been found that the naphthyl azo compounds shown in the formula I, alone or in combination with certain metal salts, are also outstandingly suitable for dyeing keratin-containing fibers, even in the absence of oxidizing agents. They result in colors with excellent brilliance and depth of color and lead to a wide range of shades. However, the use of oxidizing agents should not be excluded in principle.

The invention relates to an agent for dyeing keratin fibers, in particular human hair, containing naphthyl azo compounds of the formula I,

in der R¹ für Wasserstoff, Halogen, eine Sulfogruppe, Nitrogruppe, eine Arylazogruppe steht,

in which R ^{1 represents} hydrogen, halogen, a sulfo group, nitro group, an arylazo group,

R ^{2 represents} a phenyl group or naphthyl group which can be substituted by halogen, hydroxyl, amino, sulfo, carboxy, nitro or C 1 -C 4 alkoxy groups,

M for hydrogen, an alkali or 1/2 alkaline earth metal, 1/3 Al (III), 1/2 Zn (II), 1/4 Ti (IV), 1/4 Zr (IV), 1/3 Cr ( lll), 1/2 Co (ll), 1/2 Fe (ll), 1/3 Mo (lll) or 1/6 Mo (VI), 1/3 W (lll) or 1/6 W ( VI) or ammonium.

Keratin-containing fibers are wool, furs, feathers and in particular human hair. In principle, the colorants according to the invention can also be used for dyeing other natural fibers, such as, As cotton, jute, sisal, linen or silk, modified natural fibers, such as. B. regenerated cellulose, nitro, alkyl or hydroxyalkyl or acetyl cellulose and synthetic fibers such as. B. polyamide, polyacrylonitrile, polyurethane and polyester fibers can be used.

The compounds having the formula I are preferably selected from the group of the following azo compounds: Chromotrop 2R, Chromotrop 2B, eriochrome blue SE, pontacyl violet ABSN, pontacyl violet 4R, sodium salt of 2- (4-sulfophenylazo) chromotropic acid, sodium salt of 2- (2-pyridylazo ) - chromotropic acid.

These substances are known from the literature or are commercially available.

The above-mentioned azo compounds having the formula I are usually present in the agents according to the invention in an amount of 0.03 to 65 mmol, in particular from 1 to 40 mmol, based on 100 g of the total colorant. They can be used as substantive colorants or in the presence of other components.

Colorants which contain the azo compound having the formula I alone are preferably used for colorations in the range from red, red-violet, blue-violet and red-brown.

An expansion of the color nuances and improvement of the intensity can be achieved if the azo compounds with the formula I are used in combination with metal seeds of the 2nd and 3rd main group of the periodic table and / or salts of the transition metals. The compounds having the formula I and the metal salts are preferably used in a molar ratio of 0.5: 1 to 2: 1 in this embodiment.

The metal salts which are preferably used are preferably selected from the chlorides, sulfates, acetates, lactates and nitrates of Ca, Mg, Al (III), Zn (II), Ti (IV), Zr (IV), Cr (III), Co ( ll), Fe (ll), Mo (III, VI), Wllll, VI).

On the presence of oxidizing agents, e.g. B. H ₂ 0 ₂ , can be omitted. However, it may be desirable to add hydrogen peroxide or other oxidizing agents to the agents according to the invention to obtain the shades that are lighter than the keratin-containing fiber to be colored. Oxidizing agents are generally used in an amount of 0.01 to 6% by weight, based on the application solution. A preferred oxidizing agent for human hair is H ₂ 0 ₂ .

In a preferred embodiment, the colorants according to the invention contain, in addition to the compounds contained according to the invention, customary oxidation dye precursors, in particular selected from the compounds mentioned above, and / or substantive dyes, for example, to further modify the color shades. B. from the group of nitrophenylenediamines, nitroamino phenols, anthraquinones or indophenols, such as. B. under the international names or trade names HC Yellow 2, HC Yellow 4, HC Yellow 6, Basic Yellow 57, Disperse Orange 3, HC Red 3, HC Red BN, Basic Red 76, HC Blue 2, Disperse Blue 3, Basic Blue 99, HC Violet 1, Disperse Violet 1, Disperse Violet 4, Disperse Black 9, Basic Brown 16 and Basic Brown 17 known compounds as well as picramic acid 2-amino-6-chloro-4-nitrophenol, 4-amino-2-nitrodiphenylamine -2'-carboxylic acid, 6-nitro-1, 2,3,4-tetrahydroquinoxaline, 4-N-ethyl-1, 4-bis (2'-hydroxyethylamino) -2-nitrobenzene hydrochloride and 1-methyl-3- nitro-4- (2'-hydroxyethyl) aminobenzene. The agents according to the invention in accordance with this embodiment preferably contain the substantive dyes in an amount of 0.01 to 20% by weight, based on the total colorant.

Furthermore, the preparations according to the invention can also contain naturally occurring dyes such as, for example, henna red, henna neutral, henna black, chamomile flowers, sandalwood, black tea, rotten bark, sage, blue wood, madder root, catechu, sedre and alkanna root.

It is not necessary that the components used in each case represent uniform connections. Rather, in the colorants according to the invention, due to the production process for the individual dyes, further components may be present in minor amounts, provided that these do not adversely affect the coloring result or for other reasons, e.g. B. toxicological, must be excluded.

The colorants according to the invention produce intensive colorations even at physiologically tolerable temperatures of below 45 ° C. They are therefore particularly suitable for dyeing human hair. For use on human hair, the colorants can usually be incorporated into a water-containing cosmetic carrier. Suitable water-containing cosmetic carriers are e.g. B. creams, emulsions, gels or surfactant-containing foaming solutions such. B. shampoos or others Preparations that are suitable for use on keratin fibers. If necessary, it is also possible to incorporate the colorants into anhydrous carriers.

Furthermore, the colorants according to the invention can contain all active ingredients, additives and auxiliaries known in such preparations. In many cases, the colorants contain at least one surfactant, both anionic and zwitterionic, ampholytic, nonionic and cationic surfactants being suitable in principle. In many cases, however, it has proven advantageous to select the surfactants from anionic, zwitterionic or nonionic surfactants.

Suitable anionic surfactants in preparations according to the invention are all anionic surface-active substances suitable for use on the human body. These are characterized by a water-solubilizing, anionic group such as. B. a carboxylate, sulfate, sulfonate or phosphate group and a lipophilic alkyl group with about 10 to 22 carbon atoms. In addition, the molecule can contain glycol or polyglycol ether groups, ester, ether and amide groups and hydroxyl groups. Examples of suitable anionic surfactants are, in each case in the form of the sodium, potassium and ammonium as well as the mono-, di- and trialkanolammonium salts with 2 or 3 carbon atoms in the alkanol group,

linear fatty acids with 10 to 22 carbon atoms (soaps),

Ether carboxylic acids of the formula R-0- (CH ₂ -CH ₂ 0) _x -CH ₂ -COOH, in which R is a linear alkyl group with 10 to 22 C atoms and x = 0 or 1 to 16, acyl sarcosides with 10 to 18 C atoms in the acyl group, acyl taurides with 10 to 18 C atoms in the acyl group, acyiisethionates with 10 to 18 C atoms in the acyl group, sulfosuccinic acid and dialkyl esters with 8 to 18 C atoms in the alkyl group and sulfosuccinic acid mono-alkyl polyoxyethyl ester with 8 to 18 carbon atoms in the alkyl group and 1 to 6 oxyethyl groups, linear alkane sulfonates with 12 to 18 carbon atoms, linear alpha olefin sulfonates with 12 to 18 carbon atoms, methyl alpha sulfofatty acid esters of fatty acids with 12 to 18 carbon atoms, alkyl sulfates and alkyl polyglycol ether sulfates of the formula R-0 (CH ₂ -CH ₂ 0 ) _x - S0 ₃ H, in which R is a preferably linear alkyl group with 10 to 18 carbon atoms and x = 0 or 1 to 12,

Mixtures of surface-active hydroxysulfonates according to DE-A-3725 030, sulfated hydroxyalkyl polyethylene and / or hydroxyalkylene propylene glycol ethers according to DE-A-3723 354,

Sulfonates of unsaturated fatty acids with 12 to 24 carbon atoms and 1 to 6 double bonds according to DE-A-39 26 344,

Esters of tartaric acid and citric acid with alcohols, the addition products of about 2 to 15 molecules of ethylene oxide and / or propylene oxide to fatty alcohols with 8 to 22 carbon atoms.

Preferred anionic surfactants are alkyl sulfates, alkyl polyglycol ether sulfates and ether carboxylic acids with 10 to 18 carbon atoms in the alkyl group and up to 12 glycol ether groups in the molecule, and in particular salts of saturated and in particular unsaturated C ₈ -C ₂₂ carboxylic acids, such as oleic acid, stearic acid, isostearic acid and palmitic acid.

Zwitterionic surfactants are surface-active compounds that contain at least one quaternary ammonium group and at least one -COO ⁽⁾ - or -S0 ₃ ⁽⁾ group in the molecule. Particularly suitable zwitterionic surfactants are the so-called betaines such as the N-alkyl-N, N-dimethylammonium glycinate, for example coconut alkyl dimethylammonium glycinate, N-acylaminopropyl-N, N-dimethylammonium glycinate, for example coconut acylaminopropyl dimethylammonium glycinate, and 2-alkyl-3-carboxymethyl-3-hydroxyethyl-imidazolines each having 8 to 18 carbon atoms in the alkyl or acyl group and the cocoacylaminoethylhydroxyethylcarboxymethylglycinate. A preferred zwitterionic Surfactant is the fatty acid amide derivative known under the CTFA name Cocamidopropyl Betaine.

Ampholytic surfactants are understood to mean those surface-active compounds which, in addition to a C ₈ . ₁₈ -alkyl or -acyl group in the molecule contain at least one free amino group and at least one -COOH or -S0 ₃ H group and are capable of forming internal salts. Examples of suitable ampholytic surfactants are N-alkylglycines, N-alkylpropionic acids, N-alkylamino-butyric acids, N-alkyliminodipropionic acids, N-hydroxyethyl-N-alkylamidopropylglycines, N-alkyltaurines, N-alkyl sarcosines, 2-alkylaminopropionic acids and alkylamino acetic acids each about 8 to 18 carbon atoms in the alkyl group. Particularly preferred ampholytic surfactants are N-coconut alkyl aminopropionate, coconut acylaminoethyl aminopropionate and C ₁₂ . ₁₈ - acyl sarcosine.

Nonionic surfactants contain z as a hydrophilic group. B. a polyol group, a polyalkylene glycol ether group or a combination of polyol and polyglycol ether group. Such connections are, for example

Addition products of 2 to 30 moles of ethylene oxide and / or 0 to 5 moles of propylene oxide with linear fatty alcohols with 8 to 22 carbon atoms, with fatty acids with 12 to 22 carbon atoms and with alkylphenols with 8 to 15 carbon atoms in the alkyl group,

C ₁₂ . ₂₂ fatty acid monoesters and diesters of adducts of 1 to 30 moles of ethylene oxide with glycerol,

C _{8.22 alkyl} mono- and oligoglycosides and their ethoxylated analogues, addition products of 5 to 60 mol ethylene oxide onto castor oil and hardened castor oil,

Addition products of ethylene oxide with sorbitan fatty acid esters Addition products of ethylene oxide with fatty acid alkanolamides. Examples of the cationic surfactants which can be used in the hair treatment compositions according to the invention are, in particular, quaternary ammonium compounds. Ammonium halides such as alkyltrimethylammonium chlorides, dialkyldimethylammonium chlorides and Tr.alkylmethylammoniumchlor.de, z. B. cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, distearyldimethylammonium chloride, lauryldimethylammonium chloride, lauryldimethylbenzylammonium chloride and tricetylmethylammonium chloride. The quaternized protein hydrolyzates are further cationic surfactants which can be used according to the invention.

Also suitable according to the invention are cationic silicone oils, such as, for example, the commercially available products Q2-7224 (manufacturer: Dow Corning; a stabilized trimethylsilylamodimethicone), Dow Corning 929 emulsion (containing a hydroxylamino-modified silicone, which is also referred to as amodimethicone), SM -2059 (manufacturer: General Electric), SLM-55067 (manufacturer: Wacker) and Abil ^® -Quat 3270 and 3272 (manufacturer: Th. Goldschmidt; diquaternary polydimethylsiloxane, Quaternium-80).

In addition to a good conditioning effect, alkylamidoamines, especially fatty acid amidoamines such as the ^{stearylamidopropyldimethylamine} available under the name Tego Amid ^® S 18, are notable for their good biodegradability.

Also very good biodegradability are quaternary Esterverbindungen, so-called "esterquats", such as those sold under the trademark Stepantex ^® methylhydroxyalkyldialkoyloxyalkylammonium.

An example of a suitable cationic surfactant quaternary sugar derivative is the commercial product Glucquat ^® 100, according to CTFA nomenclature a "lauryl methyl Gluceth-10 Hydroxypropyl Dimonium Chloride". The compounds with alkyl groups used as surfactants can each be uniform substances. However, it is generally preferred to start from natural vegetable or animal raw materials in the production of these substances, so that substance mixtures with different alkyl chain lengths depending on the respective raw material are obtained.

In the case of the surfactants, which are addition products of ethylene and / or propylene oxide onto fatty alcohols or derivatives of these addition products, both products with a "normal" homolog distribution and those with a narrowed homolog distribution can be used. “Normal” homolog distribution is understood to mean mixtures of homologues which are obtained as catalysts when fatty alcohol and alkylene oxide are reacted using alkali metals, alkali metal hydroxides or alkali metal alcoholates. By contrast, narrow homolog distributions are obtained if, for example, hydrotalcites, alkaline earth metal salts of ether carboxylic acids, alkaline earth metal oxides,

hydroxides or alcoholates can be used as catalysts. The use of products with a narrow homolog distribution can be preferred.

Other active ingredients, auxiliaries and additives are, for example, nonionic polymers such as, for example, vinylpyrrolidone / vinyl acrylate copolymers, polyvinylpyrrolidone and vinylpyrrolidone / vinyl acetate copolymers and polysiloxanes, cationic polymers such as quaternized cellulose ethers, polysiloxanes with quaternary groups, dimethyldiallyl polymers -Dimethyldiallylammonium chloride copolymers, dimethylaminoethyl methacrylate-vinylpyrrolidone copolymers quaternized with diethyl sulfate,

Vinylpyrrolidone-imidazolinium methochloride copolymers and quaternized polyvinyl alcohol, zwitterionic and amphoteric polymers such as acrylamido propyl trimethylammonium chloride / acrylate copolymers and octylacrylamide / methyl methacrylate / tert-butylaminoethyl methacrylate / 2-hydroxypropyl methacrylate copolymers, anionic polymers such as polyacrylic acids, crosslinked polyacrylic acids, vinyl acid / vinyl acetate / vinyl acetate Copolymers, vinyl pyrrolidone / vinyl acrylate copolymers, vinyl acetate / butyl maleate / isobornyl acrylate copolymers, methyl vinyl ether / maleic anhydride copolymers and acrylic acid / ethyl acrylate / N-tert.-butylacrylamide terpolymers,

Thickeners such as agar agar, guar gum, alginates, xanthan gum, gum arabic, karaya gum, locust bean gum, linseed gums, dextrans, cellulose derivatives, e.g. As methyl cellulose, hydroxyalkyl cellulose and carboxymethyl cellulose, starch fractions and derivatives such as amylose, amylopectin and dextrins, clays such as. B. bentonite or fully synthetic hydrocolloids such. B. polyvinyl alcohol, structurants such as glucose and maleic acid, hair conditioning compounds such as phospholipids, for example soy lecithin, egg lecithin and cephalins, and silicone oils, protein hydrolysates, especially elastin, collagen, keratin, milk protein, soy protein and wheat protein hydrolysates, the Condensation products with fatty acids as well as quaternized protein hydrolyzates, perfume oils, dimethyl isosorbide and cyclodextrins,

Solubilizers such as ethanol, isopropanol, ethylene glycol, propylene glycol, glycerin and diethylene glycol,

Anti-dandruff agents such as piroctone olamine and zinc omadine, other substances for adjusting the pH value,

Active ingredients such as panthenol, pantothenic acid, allantoin, pyrrolidone carboxylic acids and their salts, plant extracts and vitamins, cholesterol, light stabilizers, consistency enhancers such as sugar esters, polyol esters or polyol alkyl ethers, Fats and waxes such as whale, beeswax, montan wax, paraffins, fatty alcohols and fatty acid esters, fatty acid alkanolamides,

Complexing agents such as EDTA, NTA and phosphonic acids, swelling and penetration substances such as glycerol, propylene glycol monoethyl ether, carbonates, hydrogen carbonates, guanidines, ureas and primary, secondary and tertiary phosphates, imidazoles, tannins, pyrrole, opacifiers such as latex,

Pearlescent agents such as ethylene glycol mono- and distearate, blowing agents such as propane-butane mixtures, N ₂ 0, dimethyl ether, C0 ₂ and air and antioxidants.

The constituents of the water-containing carrier are used to produce the colorants according to the invention in amounts customary for this purpose; z. For example, emulsifiers are used in concentrations of 0.5 to 30% by weight and thickeners in concentrations of 0.1 to 25% by weight of the total colorant.

For the coloring result it can be advantageous to add ammonium or alkali metal salts to the coloring agents. Suitable metal salts are e.g. B. formates, carbonates, halides, sulfates, butyrates, valerates, capronates, acetates, lactates, glycolates, tartrates, citrates, gluconates, propionates, phosphates and phosphonates of NH ₄ \ potassium, sodium or lithium, with sodium acetate, lithium bromide, ammonium carbonate, Chloride and acetate are preferred. These salts are preferably present in an amount of 0.03 to 65, in particular 1 to 40, mmol based on 100 g of the total colorant.

The pH of the ready-to-use coloring preparations is usually between 2 and 11, preferably between 5 and 9. The present invention further relates to the use of naphthyl azo compounds of the formula I,

in which R represents hydrogen, halogen, a sulfo group, nitro group, an arylazo group,

R ^{2 represents} a phenyl group or naphthyl group which can be substituted by halogen, hydroxyl, amino, sulfo, carboxy, nitro or CC ₄ alkoxy groups,

M for hydrogen, an alkali or 1/2 alkaline earth metal, 1/3 Al (III), 1/2 Zn (II), 1/4 Ti (IV), 1/4 Zr (IV), 1/3 Cr ( lll), 1/2 Co (ll), 1/2 Fe (ll), 1/3 Mo (lll) or 1/6 Mo (VI), 1/3 W (lll) or 1/6 W ( VI) or ammonium stands as a coloring component in hair dyes.

Yet another object of the present invention relates to a process for dyeing keratin-containing fibers, in particular human hair, in which a colorant containing naphthyl azo compounds of the formula I

in which R ^{1 represents} hydrogen, halogen, a sulfo group, nitro group, an arylazo group, R ^{2 represents} a phenyl group or naphthyl group which can be substituted by halogen, hydroxyl, amino, sulfo, carboxy, nitro or C ^ C ^ alkoxy groups,

M for hydrogen, an alkali or 1/2 alkaline earth metal, 1/3 Al (III), 1/2 Zn (II), 1/4 Ti (IV), 1/4 Zr (IV), 1/3 Cr ( lll), 1/2 Co (ll), 1/2 Fe (ll), 1/3 Mo (lll) or 1/6 Mo (VI), 1/3 W (lll) or 1/6 W ( VI) or ammonium, as well as conventional cosmetic ingredients, are applied to the keratin fibers, left on the fibers for some time, usually about 30 minutes, and then rinsed out or washed out with a shampoo.

The above-mentioned metal salts and the compounds known as developer and coupler components can be used as further components.

The naphthyl azo compounds of the formula I and the further components can either be applied to the hair at the same time or else in succession, it being irrelevant which of the components is applied first. There may be an interval of up to 30 minutes between the application of the individual components. Pretreatment of the fibers with a salt solution is also possible.

Examples

Preparation of a coloring solution

0.01 molar solutions of the compounds with the formula I were prepared. Sodium acetate and possibly another salt were added equimolar and a drop of a 20% fatty alkyl ether sulfate solution was added. The solution was adjusted to pH 6 with dilute sodium hydroxide solution or hydrochloric acid.

A strand of 90% gray, untreated human hair was placed in this coloring solution at 30 ° C. for 30 minutes. The tress was then rinsed with lukewarm water for 30 seconds, dried with warm air and then combed out.

The respective color shades and color depths are shown in Table 1 below.

The color depth was rated on the following scale:

no or very pale color

(+) weak intensity

+ medium intensity

+ (+) medium to strong intensity

++ strong intensity

++ (+) strong to very strong intensity +++ very strong intensity Table 1

Coloring with Chromotrop 2R

Table 2

Coloring with Chromotrop 2B

In these cases, the strands of hair were first immersed in the 1% metal salt solution at 30 ° C. for 10 minutes and blotted with absorbent paper. The tresses were then immersed in a solution containing the remaining constituents.

Claims

claims 1. Agent for dyeing keratin-containing fibers, in particular human hair, containing at least one naphthyl-azo compound with the formula I as the coloring component,

in which R ^{1 represents} hydrogen, halogen, a sulfo group, nitro group, an arylazo group, R ^{2 represents} a phenyl group or naphthyl group which can be substituted by halogen, hydroxyl, amino, sulfo, carboxy, nitro or C ₁ -C ₄ alkoxy groups, M for hydrogen, an alkali or 1/2 alkaline earth metal, 1/3 Al (III), 1/2 Zn (II), 1/4 Ti (IV), 1/4 Zr (IV), 1/3 Cr ( lll), 1/2 Co (ll), 1/2 Fe (ll), 1/3 Mo (lll) or 1/6 Mo (VI), 1/3 W (lll) or 1/6 W ( VI) or ammonium. 2 Means according to claim 1, characterized in that as compounds with the formula I Chromotrop 2R, Chromotrop 2B, eriochrome blue SE, pontacyl violet ABSN, pontacyl violet 4R, sodium salt of 2- (4-sulfophenylazo) chromotropic acid, sodium salt of 2- (2- Pyridylazo) - chromotropic acid or any mixtures thereof. 3. Composition according to one of claims 1 to 2, characterized in that the naphthyl-azo compounds with the formula I in an amount of 0.03 to 65 mmol, in particular from 1 to 40 mmol, based on 100 g of the total colorant , are included. 4. Composition according to one of claims 1 to 3, characterized in that it additionally contains one or more metal salts of the 2nd or 3rd main group of the periodic table and / or one or more metal salts of a transition metal. 5. Composition according to claim 4, characterized in that the metal salts are selected from the group of chlorides, sulfates, acetates, lactates and nitrates of Ca, Mg, Al (III), Zn (II), Ti (IV), Zr ( IV), Cr (III), Co (II), Fe (II), Mo (III, VI), W (III, VI). 6. Agent according to one of claims 1 to 7, characterized in that it additionally oxidation dye precursors and / or direct dyes from the group of nitrophenylenediamines, nitroaminophenols, anthraquinones or indophenols, preferably in an amount of 0.01 to 20 wt .-% , based on the entire colorant. 7. Agent according to one of claims 1 to 8, characterized in that it contains oxidizing agents, in particular H ₂ 0 ₂ , in an amount of 0.01 to 6 wt .-%, based on the application solution. 8. Composition according to one of claims 1 to 9, characterized in that it contains anionic, zwitterionic or nonionic surfactants. 9. Use of naphthyl-azo compounds with the formula I,

in which R ^{1 represents} hydrogen, halogen, a sulfo group, nitro group, an arylazo group, R ^{2 represents} a phenyl group or naphthyl group which can be substituted by halogen, hydroxyl, amino, sulfo, carboxy, nitro or CC ₄ alkoxy groups, M for hydrogen, an alkali or 1/2 alkaline earth metal, 1/3 Al (III), 1/2 Zn (II), 1/4 Ti (IV), 1/4 Zr (IV), 1/3 Cr ( lll), 1/2 Co (ll), 1/2 Fe (ll), 1/3 Mo (lll) or 1/6 Mo (VI), 1/3 W (lll) or 1/6 W ( VI) or ammonium stands as a coloring component in hair dyes. 10. A process for dyeing fibers containing keratin, in particular human hair, in which a colorant comprising a naphthyl-azo compound of the formula I

in which R ^{1 represents} hydrogen, halogen, a sulfo group, nitro group, an arylazo group, R ^{2 represents} a phenyl group or naphthyl group which can be substituted by halogen, hydroxyl, amino, sulfo, carboxy, nitro or C _T C ^ alkoxy groups, M for hydrogen, an alkali or 1/2 alkaline earth metal, 1/3 Al (III), 1/2 Zn (II), 1/4 Ti (IV), 1/4 Zr (IV), 1/3 Cr ( lll), 1/2 Co (ll), 1/2 Fe (ll), 1/3 Mo (lll) or 1/6 Mo (VI), 1/3 W (lll) or 1/6 W ( VI) or ammonium, as well as usual cosmetic ingredients, applied to the fibers containing keratin, leave on the fiber for some time, usually about 30 minutes and then rinsed out or washed out with a shampoo.