HK1037328B - Colorant for coloring keratin fibers - Google Patents

Description

Colorant for dyeing keratin fibers

The invention relates to preparations for dyeing keratin fibres, in particular human hair, containing particular dye precursors of the indole or indoline type, and an enhancing and/or colour-changing component, to the use of said components for enhancing and/or colour-changing, and to the corresponding colouring processes.

Among the different products available for cosmetic treatment of the human body, the preparations for modifying or treating the hair to change its colour occupy a prominent position. Regardless of the light-colored formulations that reduce the oxidative properties of hair by degrading natural hair dyes, there are two types of colorants that have been of great importance in the dyeing of hair:

so-called oxidative colorants have corresponding colorfast properties and are used for permanent, intensive-color hair dyeing. Oxidative colorants generally contain oxidative dye precursors, so-called primary intermediates and class 2 intermediates. The primary intermediates form the actual dye with each other or, under the influence of an oxidizing agent or atmospheric oxygen, the primary intermediates couple with one or more 2-stage intermediates to form the actual dye. Although oxidative colorants are distinguished by their excellent dyeing effect, they have the disadvantage that they are suitable for only a small number of people. For example, some dye precursors can cause harmful skin irritation, so-called "abnormal hypersensitivity". Furthermore, oxidative dyes are generally developed by oxidizing agents, in particular hydrogen peroxide. In the case of frequent use by people with sensitive hair, which can lead to injury or even damage to the structure of the hair, the damaged hair has to be repaired with special hair care products. Not to underestimate the number of people who, whenever possible, avoid using chemical products, in the debate of popular "natural-chemicals", it is also important, perhaps only because of the personal feelings of these people;

colorants or hair dyes containing direct dyes as a dyeing component are generally used for temporary colors. Direct dyes are based on the direct adsorption of dye molecules onto the hair, and do not require an oxidation process to develop color. These dyes include, for example, henna dyes, which have been used since ancient times for the dyeing of hair and the human body.

However, since many of the eyes of the user are stained with a little hair dye during the dyeing process, thereby causing adverse effects, a new dyeing process has recently attracted much attention. In this process, a precursor of the natural hair dye melanin is applied to the hair, forming a near natural dye by an oxidation process on the hair. A corresponding process for coloration using 5, 6-dihydroxyindoline as dye precursor is described in EP-B1530229. Grey hair can be restored to its natural colour by the application, in particular, by frequent use of preparations containing 5, 6-dihydroxyindoline. The color can be developed by atmospheric oxygen as the only oxidizing agent, so no other oxidizing agent is required.

However, satisfactory results are achieved under the above conditions only on persons having "grayed" hair with medium to dark brown hair. Therefore, there is a need to try to improve upon the known coloring process so that even hair that was originally red, dark to black can return to its original color.

A method for obtaining dark to black colorations, in particular those described by the expert as "flat" methods, is the subject of german patent application 19732975.6, which is hereby incorporated by reference, in particular as an earlier document. The solution proposed in this patent application is the addition of conventional secondary intermediates. Although the color can be developed solely by the action of atmospheric oxygen, at least one other oxidizing agent is recommended as a preferred alternative.

However, in view of the aforementioned retaining rights of many consumers, there is still a need to obtain a formulation which allows grey hair to return to its natural colour, even for those who originally had dark to black hair, without the need for any purely synthetic dye ingredients, or the use of other oxidising agents than atmospheric oxygen.

It has now surprisingly been found that the above-mentioned problems can be solved by the use of a formulation which comprises at least one amino acid or oligopeptide in addition to the known indole or indoline dye precursors.

The present invention therefore relates to a preparation for the colouring of keratin fibres, in particular human hair, comprising a dye precursor selected from indoline derivatives and indole derivatives, characterized in that it also comprises at least one amino acid or oligopeptide.

The amino acids referred to in the present invention are those containing at least one amino groupGroup and at least one-COOH or-SO₃H-group species.

Preferred amino acids are aminocarboxylic acids, in particular alpha-aminocarboxylic acids and omega-aminocarboxylic acids. Among the α -aminocarboxylic acids, arginine, lysine, ornithine and histidine are particularly preferred.

According to the invention, the amino acid is preferably added to the preparation in free form. However, the amino acids can also be used in the form of salts. Preferred salts are those containing hydrohalic acids, especially salts of hydrogen chloride and hydrogen bromide.

A particularly preferred amino acid is arginine, particularly when used in free form, but may also be a salt of hydrogen chloride.

Of course, the invention also encompasses formulations comprising two or more amino acids or oligopeptides. In this case, the use of arginine in admixture with other amino acids or oligopeptides is preferred.

In addition, amino acids may be used according to the invention in the form of oligopeptides and protein hydrolysates, for example taking steps to ensure that the necessary amount of compound is converted into the desired amino acid. The literature is stated to be associated with the disclosure of DE-OS 2215303.

According to the invention, the amount of amino acids or oligopeptides contained in the preparation is preferably from 0.1 to 10% by weight, more preferably from 1 to 4% by weight, based on the total amount of the preparation.

Hair colorants, especially those developed by oxidation with atmospheric oxygen or other oxidizing agents, such as hydrogen peroxide, are typically adjusted to a slightly acidic or basic pH, i.e., to a pH in the range of 5-11. By this time, the colorant includes an alkalizing agent, i.e., an alkali or alkaline earth metal hydroxide, ammonia or an organic amine.

In a particular embodiment of the invention, the amino acid or oligopeptide is not only used to promote colour development, but also at least partly as an alkalizing agent. Correspondingly, in this embodiment, an aqueous solution of 2.5% by weight of amino acids and oligopeptides having a pH of 9 or more is preferred. One such amino acid is preferably arginine. In this particular embodiment, the additional alkalizing agent is selected from the group consisting of monoethanolamine, monoisopropanolamine, 2-amino-2-methylpropanol, 2-amino-2-methyl-1, 3-propanediol, 2-amino-2-ethyl-1, 3-propanediol, 2-amino-2-methylbutanol and triethanolamine, and alkali and alkaline earth metal hydroxides. Of this group of compounds, monoethanolamine, triethanolamine and 2-amino-2-methylpropanol and 2-amino-2-methyl-1, 3-propanediol are particularly preferred. Omega-amino acids, such as omega-aminocaproic acid, are also preferably used as alkalizing agents in this embodiment of the invention.

Particularly advantageous properties are exhibited by formulations in which the weight ratio of amino acid or oligopeptide to other alkalizing agent is from 1: 5 to 5: 1. A weight ratio of 1: 2 to 2: 1 has proven particularly suitable.

According to the invention, the preparations contain indole or indoline dye precursors as further essential constituents.

According to the invention, preferred indoles and indolines are compounds comprising at least one hydroxyl or amino group, preferably as a substituent on a six-membered ring. These radicals may carry further substituents, for example in the form of alkylation of amino groups or etherification or esterification of hydroxyl groups. Compounds containing two of these groups, in particular compounds containing two hydroxyl groups, one or both of which may be etherified or esterified, are particularly preferred.

Particularly preferred dye precursors according to the invention are indoline derivatives, such as 5, 6-dihydroxyindoline, N-methyl-5, 6-dihydroxyindoline, N-ethyl-5, 6-dihydroxyindoline, N-propyl-5, 6-dihydroxyindoline, N-butyl-5, 6-dihydroxyindoline, 5, 6-dihydroxyindoline-2-carboxylic acid, 4-, 6-and 7-hydroxyindoline, 6-aminoindoline and 4-aminoindoline.

Most particularly preferred dye precursors are the corresponding 5, 6-dihydroxyindoline derivatives of the formula (1a), or the physiologically compatible salts of organic or inorganic acids of these compounds:

wherein-the groups are independent of each other-

R¹Is a hydrogen atom, C_1-4Alkyl or C_1-4A hydroxyalkyl group;

R²is a hydrogen atom or-COOH, wherein-COOH may even be present in the form of a salt of a physiologically compatible anion;

R³is a hydrogen atom or C_1-4An alkyl group;

R⁴is a hydrogen atom, C_1-4Alkyl or-CO-R⁶Wherein R is⁶Is C_1-4An alkyl group;

R⁵represents the above-mentioned R⁴One of the groups.

According to the invention, preferred representatives are 5, 6-dihydroxyindoline, N-methyl-5, 6-dihydroxyindoline, N-ethyl-5, 6-dihydroxyindoline, N-propyl-5, 6-dihydroxyindoline, N-butyl-5, 6-dihydroxyindoline. The parent compound, 5, 6-dihydroxyindoline, is the most preferred compound.

According to the invention, preferred indoles are 5, 6-dihydroxyindole, N-methyl-5, 6-dihydroxyindole, N-ethyl-5, 6-dihydroxyindole, N-propyl-5, 6-dihydroxyindole, N-butyl-5, 6-dihydroxyindole, 5, 6-dihydroxyindole-2-carboxylic acid, 4-, 6-and 7-hydroxyindole, 6-aminoindole and 4-amino-indole.

Particularly preferred are derivatives of 5, 6-dihydroxyindole corresponding to the formula (1b), or the organic or inorganic acids or organic acid-bound physiologically compatible salts of these compounds:

wherein-the groups are independent of each other-

R¹Is a hydrogen atom, C_1-4Alkyl or C_1-4A hydroxyalkyl group;

R²is a hydrogen atom or-COOH, wherein-COOH may even be present in the form of a salt of a physiologically compatible anion;

R³is a hydrogen atom or C_1-4An alkyl group;

R⁴is a hydrogen atom, C_1-4Alkyl or-CO-R⁶Wherein R is⁶Is C_1-4An alkyl group;

R⁵represents the above-mentioned R⁴One of the groups.

According to the present invention, 5, 6-dihydroxyindole, N-methyl-5, 6-dihydroxyindole, N-ethyl-5, 6-dihydroxyindole, N-propyl-5, 6-dihydroxyindole, N-butyl-5, 6-dihydroxyindole, and the parent compound 5, 6-dihydroxyindole are the most preferable compounds.

According to the invention, the indolines and indole derivatives present in the formulations can be used in the form of the free bases and their physiologically compatible salts in combination with inorganic or organic acids, for example, with hydrogen chloride, sulfuric acid, hydrogen bromide.

According to the invention, the weight of indole and indoline in the formulation is generally 0.05 to 10% by weight, preferably 0.2 to 5% by weight.

Of course, the invention also encompasses formulations of more than one indoline or indole derivative or mixture of indoline or indole derivatives.

In a particularly preferred embodiment, the preparations according to the invention contain no dye or dye precursor but the aforementioned indole or indoline derivatives.

However, in principle, other dye components or dye precursors may be used.

In embodiments that include such additional compounds, the following are preferred:

preferred primary intermediates:

p-phenylenediamine, p-toluenediamine, p-aminophenol, o-aminophenol, 1- (2' -hydroxyethyl) -2, 5-diaminobenzene, N-bis- (2-hydroxyethyl) -p-phenylenediamine, 2- (2, 5-diaminophenoxy) -ethanol, 1-phenyl-3-carboxamido-4-amino-5-pyrazolone, 4-amino-3-methylphenol, 2, 4, 5, 6-tetraaminopyrimidine, 2-hydroxy-4, 5, 6-triaminopyrimidine, 4-hydroxy-2, 5, 6-triaminopyrimidine, 2, 4-dihydroxy-5, 6-diaminopyrimidine, 2-dimethylamino-4, 5, 6-triaminopyrimidine, 2-hydroxyethylaminomethyl-4-aminophenol, 4' -diaminodiphenylamine, 4-amino-3-fluorophenol, 2-aminomethyl-4-aminophenol, 2-hydroxymethyl-4-aminophenol, bis- (2-hydroxy-5-aminophenyl) -methane, 1, 4-bis- (4-aminophenyl) -diazepane, 1, 3-bis- (N- (2-hydroxyethyl) -N- (4-aminophenylamino)) -2-propanol, 4-amino-2- (2-hydroxyethoxy) -phenol, 4, 5-diaminopyrazole derivatives, according to EP 0740741 and WO 94/08970, for example, 4, 5-diamino-1- (2' -hydroxyethyl) -pyrazole.

Particularly preferred primary intermediates:

p-phenylenediamine, p-toluenediamine, p-aminophenol, 1- (2' -hydroxyethyl) -2, 5-diaminobenzene, 4-amino-3-methylphenol, 4-amino-2- ((diethylamino) -methyl) -phenol, 2, 4, 5, 6-tetraaminopyrimidine, 2-hydroxy-4, 5, 6-triaminopyrimidine, 4-hydroxy-2, 5, 6-triaminopyrimidine.

Preferred secondary intermediates:

meta-aminophenol and derivatives thereof, for example, 5-amino-2-methylphenol, 5- (3-hydroxypropylamino) -2-methylphenol, 3-amino-2-chloro-6-methylphenol, 2-hydroxy-4-aminophenoxyethanol, 3-amino-6-methoxy-2-methylaminophenol, 2, 6-dimethyl-3-aminophenol, 3-trifluoroacetylamino-2-chloro-6-methylphenol, 5-amino-4-chloro-2-methylphenol, 5-amino-4-methoxy-2-methylphenol, 5- (2' -hydroxyethyl) -amino-2-methylphenol, 3- (diethylamino) phenol, N-cyclopentyl-3-aminophenol, 1, 3-dihydroxy-5- (methylamino) benzene, 3-ethylamino-4-methylphenol, and 2, 4-dichloro-3-aminophenol;

-o-aminophenol and derivatives thereof;

m-diaminobenzene and its derivatives, for example, 2, 4-diaminophenoxyethanol, 1, 3-bis- (2, 4-diaminophenoxy) -propane, 1-methoxy-2-amino-4- (2 '-hydroxyethylamino) -benzene, 1, 3-bis- (2, 4-diaminophenyl) -propane, 2, 6-bis- (2-hydroxyethylamino) -1-methyl-benzene, and 1-amino-3-bis- (2' -hydroxyethyl) -aminobenzene;

o-diaminobenzene and its derivatives, for example 3, 4-diaminobenzoic acid and 2, 3-diamino-1-methylbenzene;

di-and trihydroxybenzene derivatives, for example resorcinol, resorcinol monomethyl ether, 2-methylresorcinol, 5-methylresorcinol, 2, 5-dimethylresorcinol, 2-chlororesorcinol, 4-chlororesorcinol, 1, 2, 3-benzenetriol and 1, 2, 4-trihydroxybenzene;

pyridine derivatives, such as 2, 6-dihydroxypyridine, 2-amino-3-hydroxypyridine, 2-amino-5-chloro-3-hydroxypyridine, 3-amino-2-methylamino-6-methoxypyridine, 2, 6-dihydroxy-3, 4-dimethylpyridine, 2, 6-dihydroxy-3, 4-diaminopyridine, 2, 6-dihydroxy-4-methylpyridine, 2, 6-diaminopyridine, 2, 3-diamino-6-methoxypyridine and 3, 5-diamino-2, 6-dimethoxypyridine;

naphthalene derivatives, such as 1-naphthol, 2-methyl-1-naphthol, 2-hydroxymethyl-1-naphthol, 2-hydroxyethyl-1-naphthol, 1, 5-dihydroxynaphthalene, 1, 6-dihydroxynaphthalene, 1, 7-dihydroxynaphthalene, 1, 8-dihydroxynaphthalene, 2, 7-dihydroxynaphthalene and 2, 3-dihydroxynaphthalene;

morpholine derivatives, such as 6-hydroxybenzomorph and 6-aminobenzomorph;

quinoxaline derivatives, such as, for example, 6-methyl-1, 2, 3, 4-tetrahydroquinoxaline;

pyrazole derivatives, such as 1-phenyl-3-methylpyrazol-5-one;

indole derivatives, such as 4-hydroxyindole, 6-hydroxyindole and 7-hydroxyindole;

methylenedioxybenzene derivatives, for example, 3, 4-methylenedioxyphenol, 1-hydroxy-3, 4-methylenedioxybenzene, 1-amino-3, 4-methylenedioxybenzene and 1- (2' -hydroxyethyl) -amino-3, 4-methylenedioxybenzene.

Particularly preferred secondary intermediates:

1-naphthol, 1, 5-, 2, 7-and 1, 7-dihydroxynaphthalene, 3-aminophenol, 5-amino-2-methylphenol, 2-amino-3-hydroxypyridine, resorcinol, 4-chlororesorcinol, 2-chloro-6-methyl-3-aminophenol, 2-methylresorcinol, 5-methylresorcinol, 2, 5-dimethylresorcinol, 2, 6-dihydroxy-3, 4-diaminopyridine.

Preferred direct dyes are the compounds known by the international or commercial names HC yellow 2, HC yellow 4, HC yellow 5, HC yellow 6, basic yellow 57, disperse orange 3, HC red BN, basic red 76, HC blue 2, HC blue 12, disperse blue 3, basic blue 99, HC violet 1, disperse violet 4, disperse black 9, basic brown 16 and basic brown 17, and also 4-amino-2-nitrodianilino-2' -carboxylic acid, 6-nitro-1, 2, 3, 4-tetrahydroquinoxaline, hydroxyethyl-2-nitrotoluidine, picric acid, 2-amino-6-chloro-4-nitrophenol, 4-ethylamino-3-nitrobenzoic acid and 2-chloro-6-ethylamino-1-hydroxy-4-nitrobenzene. Other preferred direct dyes are naturally occurring dyes, for example henna red, henna neutral, henna, camomile, chamomile, sandalwood, black tea, alder bark, sage, logwood, madder root, catechu, sand grass (Sedre) and beefsteak root.

The oxidation dye precursor or direct dye need not be a single compound. In contrast, according to the present invention, hair colorants can contain small amounts of other components as a result of the process used to produce the single dye, if they have no adverse effect on the hair coloring effect or have to be cancelled for other reasons, such as toxicological reasons.

According to the invention, relevant documents are found in works of Ch.Zviak, "science of hair care", Chapter 7 (248-250; direct dyes) and Chapter 8 (264-267; oxidation dye precursors), dermatology series, Vol.7 (coded by Ch.Culnan and H.Maibach), Marcel Dekker Inc., New York/Basel, 1986, and in "European Garden Invertar Kosmeik-Rohstoffe" (published by Europ Geimenschaft), available in the form of floppy disks from German pharmaceutical industry Inc. (Bunsverband Deutscher-und Handwerchen Hanternen wenf ü r Arzneim, Manchurn Warnen Refk *, German red German pharmaceutical industries.

According to the invention, the content of the oxidation dye precursors and direct dyes in the preparations is preferably from 0.01 to 20% by weight, more preferably from 0.5 to 5% by weight, based on the total amount of the preparation.

Preferred formulations containing other dyes or dye precursors are those which do not contain a primary intermediate species. In this embodiment of the invention, the corresponding formulation comprises an oxidation dye precursor of the secondary intermediate class, if desired a direct dye.

Other preferred formulations are those oxidation dye precursors that do not contain secondary intermediate species. These preparations are also preferably free of oxidation dye precursors of the primary intermediate class, but may contain direct dyes, preferably of the naturally occurring dye series.

In accordance with the present invention, the essential and optional ingredients mentioned above are added to a suitable aqueous carrier for the production of the colorant. For hair colouring, these carriers are, for example, emulsions, creams, gels, or even foaming solutions containing surfactants, such as shampoos, foam sprays or some other preparation suitable for application to the hair.

According to the invention, the pH of the hair dye is adjusted to preferably 5 to 11, particularly preferably 7 to 10.

The colorants according to the invention may also comprise any of the known typical active substances, additives and adjuvants. In many cases, the colorant comprises at least one surfactant, in principle anionic and zwitterionic surfactants, amphoteric surfactants, nonionic and cationic surfactants and the like are suitable. However, in many cases, it has been found that surfactants selected from anionic, zwitterionic or nonionic surfactants are advantageous, anionic surfactants being particularly useful.

According to the present invention, the anionic surfactant suitable for the hair dye is any anionic surfactant suitable for human body. Such materials have water-soluble anionic groups, such as carboxylate, sulfate, sulfonate or phosphate groups, and lipophilic alkyl groups containing from about 10 to about 20 carbon atoms. In addition, glycol or polyglycol ether groups, ethers, amides and hydroxyl groups, and generally ester groups, may also be present in the molecule. The following are examples of suitable anionic surfactants, in the form of sodium, potassium and ammonium salts and mono-, di-and tri-alkanolammonium salts containing 2 or 3 carbon atoms in the alkanol group:

-straight and branched chain fatty acids (soaps) containing 8 to 22 carbon atoms;

the corresponding structural formula R-O- (CH)₂-CH₂O)_x-CH₂-COOH, wherein R is a straight-chain alkyl radical comprising 10 to 22 carbon atoms, x ═ 0 or 1 to 16,

acyl sarcosines containing 10 to 18 carbon atoms in the acyl radical,

-acyl tauric acid containing 10 to 18 carbon atoms in the acyl group,

acyl isethionic acid containing 10 to 18 carbon atoms in the acyl group,

-a mono-or di-alkyl sulfosuccinate containing 8 to 18 carbon atoms in the alkyl group and a monoalkyl polyoxyethyl sulfosuccinate containing an alkyl group containing 8 to 18 carbon atoms and 1 to 6 oxyethyl groups,

linear alkanesulfonic acids having from 12 to 18 carbon atoms,

-a linear alpha-olefin sulfonic acid containing 12 to 18 carbon atoms,

-methyl esters of alpha-thio fatty acids containing from 12 to 18 carbon atoms,

-corresponding structural formula R-O (CH)₂-CH₂O)_x-SO₃H, where R is a straight-chain alkyl radical preferably containing from 10 to 18 carbon atoms, x ═ 0 or from 1 to 12,

according to DE-A-3725030, mixtures of surface-active hydroxysulfonates,

sulfated hydroxyalkyl polyethylene and/or hydroxyalkylene propylene glycol ethers according to DE-A-3723354,

according to DE-A-3926334, sulfonates of unsaturated fatty acids containing 12 to 24 carbon atoms and 1 to 6 double bonds,

-alcohol esters of tartaric and citric acids, in the form of adducts of about 2 to 15 molecules of ethylene oxide and/or propylene oxide with fatty alcohols containing 8 to 22 carbon atoms.

Preferred anionic surfactants are alkyl sulfates, alkyl polyglycol ether sulfates and ether carboxylic acids, the alkyl radical containing from 10 to 18 carbon atoms and up to 12 glycol ether groups in the molecule, especially saturated salts, most especially unsaturated C_8-22Carboxylic acids such as oleic acid, stearic acid, isostearic acid and palmitic acid.

In the present invention, the zwitterionic surfactant is a mixture of molecules containing at least one quaternary ammonium group and at least one-COO group^-or-SO₃ ^-A surface active compound of the group. Particularly suitable zwitterionic surfactants are the so-calledBetaines (trimethylamine ethyllactone), such as N-alkyl-N, N-dimethylammonium glycinates, for example, cocoalkyldimethylammonium glycinate, N-acylaminopropyl-N, N-dimethylammonium glycinates, for example, cocoamidopropyldimethylammonium glycinate and 2-alkyl-3-carboxymethyl-3-hydroxyethylimidazoline, having from 8 to 18 carbon atoms in the alkyl or acyl group; and cocoamidoethylhydroxyethyl carboxymethyl glycine ester. A preferred zwitterionic surfactant is the fatty acid amide derivative designated by CTFA as cocoamidopropyl Betaine (Cocamidopropyl Betaine).

Amphoteric surfactants are surface-active compounds having in the molecule, in addition to C_8-18Containing, in addition to alkyl or acyl radicals, at least one free amino group and at least one-COOH or-SO group₃H groups and can also form internal salts. Examples of suitable amphoteric surfactants are N-alkylglycines, N-alkylpropionic acids, N-alkylaminobutyric acids, N-alkyliminodipropionic acids, N-hydroxyethyl-N-alkylamidopropylglycines, N-alkylaminoethanesulfonic acids, N-alkylsarcosines, 2-alkylaminopropionic acids and alkylaminoacetic acids, containing from about 8 to 18 carbon atoms in the alkyl radical. Particularly preferred amphoteric surfactants are N-cocoalkylaminopropionic acid, cocoacylaminoethylaminopropionic acid and C_12-18Acyl sarcosines.

The nonionic surfactant includes, for example, a polyhydric alcohol group, a polyalkylene glycol ether group or a mixture of a polyhydric alcohol and a polyalkylene glycol ether as a hydrophilic group. Examples of such compounds are:

-the addition product of 2 to 30 moles of ethylene oxide and/or 0 to 5 moles of propylene oxide with a linear fatty alcohol containing 8 to 22 carbon atoms, with a fatty acid containing 12 to 22 carbon atoms and with an alkylphenol having 8 to 15 carbon atoms in the alkyl group;

c of an addition product of 1 to 30 moles of ethylene oxide with glycerol_12-22Fatty acid monoesters and diesters;

-C_8-22alkyl mono-and oligosaccharide glycosides and ethoxylated analogs thereof;

-addition products of 5-60 moles of ethylene oxide with castor oil and hydrogenated castor oil;

-addition products of ethylene oxide with sorbitan fatty acid esters;

-addition products of ethylene oxide with fatty acid alkanolamides.

Examples of cationic surfactants suitable for preparations for treating hair according to the invention are, in particular, quaternary ammonium compounds. Preferred quaternary ammonium compounds are ammonium halides, such as alkyltrimethylammonium chloride, dialkyldimethylammonium chloride and trialkylmethylammonium chloride, for example cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, distearyldimethylammonium chloride, dodecyldimethylammonium chloride, dodecyldimethylbenzylammonium chloride and trihexadecylmethylammonium chloride. Other cationic surfactants which may be used according to the invention are quaternized protein hydrolysates.

Cationic silicone oils which are also suitable for use according to the invention are, for example, the commercially available products Q2-7224 (manufacturer: Dow Corning; stabilised trimethylsilyl Amodimethicone silicon), Dow Corning 929 Emulsion (containing a hydroxylamino-modified silicone under the trade name Amodimethicone), SM-2059 (manufacturer: general electric), SLM-55067 (manufacturer: Wacker) and Abil^*Quat 3270 and 3272 (manufacturer: Th. Goldschmidt; quaternary polydimethylsiloxane, Quaternium-80).

The alkyl amidoamine, particularly the fatty acid amidoamine, such as stearamidopropyl dimethylamine, can be Tego Amid^*S18, which is very distinctive not only in their very good conditioning effect, but also, at the same time, in particular, in their easy biodegradability.

Quaternary ester compounds, so-called "quaternary esters", e.g. methyl hydroxyalkyl dialkoxyalkyl ammonium methosulphate, under the trade name "Stepandex^*The corresponding commercial product is Dehyquart^*And is also readily biodegradable.

An example of a tetrasaccharide derivative suitable for use as a cationic surfactant is the commercial product Glucquat^*100(CTFA name: dodecyl methyl Gluceth hydroxypropyl ammonium chloride).

The alkyl group-containing compound used as the surfactant may be a single compound. Generally, however, these compounds are made from natural plant or animal raw materials, so that mixtures with different lengths of alkane chains can be obtained, depending on the particular raw material.

Surfactants such as addition products of ethylene oxide and/or propylene oxide with fatty alcohols or derivatives of these addition products can be normal homolog distribution products and narrow homolog distribution products. The product of the distribution of the orthologs is a mixture of homologs derived from the reaction of a fatty alcohol and an alkylene oxide in the presence of an alkali metal, alkali metal hydroxide or alkali metal alkoxide as catalyst. In contrast, narrow homologue distribution is obtained when, for example, hydrotalcite is used, in the case of alkaline earth metal ether carboxylates, alkaline earth metal oxides, hydroxides or alcoholates as catalysts. The use of narrow homologue distribution products has advantages.

Other active substances, auxiliaries and additives are, for example:

nonionic polymers, such as vinylpyrrolidone/vinyl acrylate copolymers, polyvinylpyrrolidone and vinylpyrrolidone/vinyl acetate copolymers and polysiloxanes,

cationic polymers, such as quaternized cellulose ethers, polysiloxanes containing quaternary ammonium groups, dimethyldiallylammonium chloride polymers, acrylamide/dimethyldiallylammonium chloride copolymers, dimethylaminoethyl methacrylate/vinylpyrrolidone copolymers quaternized with diethyl sulfate, vinylpyrrolidone/imidazolinemethyl chloride copolymers and quaternized polyvinyl alcohols;

zwitterionic and amphoteric polymers, for example, acrylpropyl/trimethylammonium chloride/acrylate copolymers and octylacrylamide/methyl methacrylate/tert-butylaminoethyl methacrylate/2-hydroxypropyl methacrylate copolymers;

anionic polymers, such as polyacrylic acid, crosslinked polyacrylic acid, vinyl acetate/crotonic acid copolymers, vinylpyrrolidone/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, carob flour, flaxseed gum, dextran, cellulose derivatives, such as methylcellulose, hydroxyalkyl cellulose and carboxymethylcellulose, fractionated starches and derivatives, such as amylose, amylopectin and dextrin, china clay, for example, bentonite or fully synthetic hydrated colloids, for example, polyvinyl alcohol;

-texturizing agents such as glucose, maleic acid and lactic acid;

hair-care compounds, such as phospholipids, for example soya lecithin, egg lecithin and cephalin, and also silicone oils;

protein hydrolysates, in particular elastin, collagen, keratin, milk protein, soy protein and wheat protein hydrolysates, and condensation products thereof with fatty acids and quaternized protein hydrolysates;

-aromatic oils, dimethyl isosorbide and cyclodextrins;

solvents and solubilizers, such as ethanol, isopropanol, ethylene glycol, propylene glycol, glycerol and diethylene glycol;

antidandruff agents such as Piroctone Olamine and Zink Omadine;

other substances for adjusting the pH, such as alpha-and beta-hydroxycarboxylic acids;

active substances, such as panthenol, pantothenic acid, allantoin, pyrrolidone carboxylic acid and its salts, plant extracts and vitamins;

-cholesterol;

-a UV filter material;

consistency promoters, such as sugar esters, polyol esters or polyol alkyl ethers;

fats and waxes, such as spermaceti wax, beeswax, montan wax, paraffin wax, fatty alcohols and fatty acid esters;

-fatty acid alkanolamides;

complexing agents, such as EDTA, NTA and phosphonic acid;

swelling and penetrating agents, such as glycerol, propylene glycol monoethyl ether, carbonates, hydrogenated carbonates, guanidines, ureas and primary, secondary and tertiary phosphates;

-opacifiers, such as latex;

pearlescent substances, such as ethylene glycol mono-and distearate;

propellants, e.g. propane/butane mixtures, N₂O, dimethyl ether, CO₂And air;

-an antioxidant.

The ingredients of the aqueous carrier are applied in the usual amounts for the production of colorants according to the invention. For example, the emulsifiers are used in concentrations of 0.5 to 30% by weight, and the thickeners are used in concentrations of 0.1 to 25% by weight, based on the total amount of colorant.

In a preferred embodiment, the color is developed by atmospheric oxygen as the only oxidizing agent.

However, in principle, chemical oxidizing agents may also be used, in particular when the formulation also comprises oxidation dye precursors of the primary and secondary intermediate classes. When the same is applied to human hair, the hair is not only colored, but also beautiful. Particularly suitable oxidizing agents are hydrogen peroxide or addition products thereof with urea, melamine or sodium borate. The oxidation can also be carried out under the action of enzymes. In this case, the enzyme may be used to produce an oxidizing effect that is oxidized by the compound and enhances the presence of a small amount of oxidizing agent. An example of an enzymatic process is a process in which small amounts of hydrogen peroxide (e.g. 1% or less based on the total amount of the formulation) affect the enhancement by peroxidase.

The oxidizing agent preparation is preferably mixed with the preparation of the oxidation dye precursor immediately before the hair is dyed. The pH of ready-to-use hair colorants should be in the range of 6-10. In a particularly preferred embodiment, the hair colorant is used in a moderately alkaline medium. The temperature of use may be in the range of 15-40 ℃ but is preferably at the temperature of the scalp. After about 5 to 45 minutes, preferably 15 to 30 minutes of contact, the hair colorant is removed from the hair and the color is changed by rinsing. The hair does not have to be shampooed when a carrier with a high surfactant content, such as a coloring shampoo, has been used.

In the special case of hair which is difficult to colour, preparations containing oxidation dye precursors can be applied to the hair without prior mixing with the oxidizing component. The oxidizing component is applied after 20-30 minutes of contact, optionally after rinsing. After another 10-20 minutes of contact, the hair is rinsed, if desired, by shampooing the hair. In a first variant of this embodiment, the pre-application of the dye precursor is to increase the penetration into the hair, the corresponding formulation adjusting the pH to about 4-7. In a second variant, the air oxidation is carried out first and the formulation is applied preferably at a pH of 7 to 10. In the subsequent accelerated post-oxidation stage, it is advantageous to use an acidified peroxydisulfate solution as oxidizing agent.

Whatever the above-mentioned process of applying the colorant of the present invention, the appearance of color may be enhanced and enhanced by some metal ions added to the colorant. Some examples of such metal ions are Zn²⁺、Cu²⁺、Fe²⁺、Fe³⁺、Mn²⁺、Mn⁴⁺、Li⁺、Mg²⁺、Ca²⁺And Al³⁺。Zn²⁺、Cu²⁺And Mn²⁺Is particularly suitable. Generally, the metal ions can be applied in the form of physiologically compatible salts. Preferred salts are acetates, sulfates, halides, lactates and tartrates. A particularly preferred metal salt is zinc sulfate. The development of hair colour can be accelerated and the hue can be influenced as desired via the use of these metal salts.

The invention also relates to the use of amino acids or oligopeptides for enhancing and/or changing the colour when dyeing keratin fibres with preparations containing indoline derivatives or indole derivatives as dye precursors.

The invention also relates to a method for dyeing human hair, in which one of the above-mentioned preparations is applied to the hair and, subsequently, the color develops. In a preferred embodiment, the color is developed under the influence of atmospheric oxygen.

In a particular embodiment of this process, the final color is developed by repeated application of the formulation following each air oxidation. The formulation is preferably applied at intervals of 1 day to 2 weeks. Particular colors can be selected in this way.

The following examples serve to illustrate the invention.

Examples

1. Dyeing process

First, the coloring agents having the compositions shown in Table 1 were prepared (all amounts are in grams unless otherwise indicated)

The hair dyeing is carried out on a bundle of hair 5 cm long and 0.5 g heavy. The formulation to be tested was applied to the hair at 1 gram. After 20 minutes (oxidation in air), the formulation was rinsed off with water and the hair rinsed with a commercial shampoo. The colors and corresponding conditions are given in table 2 after 1 day of exposure of the bundle head at room temperature under standard air humidity conditions (relative humidity of about 50%).

Table 1: preparation

The component E1E 2C 1C 2C 3

·Stenol^*1618 O¹ 6.7 6.7 6.7 6.7 6.7

·Lorol^*techn² 2.0 2.0 2.0 2.0 2.0

·Eumulgin^*B 2³ 2.0 2.0 2.0 2.0 2.0

Ascorbic acid 0.20.20.20.20.2

Ammonium sulfate- -1.0- -

5, 6-dihydroxyindoline hydrogen bromide 1.0-1.01.0-

5, 6-diacetoxyindole-1.0- -1.0

KOH adjusted to pH 9.5- -flex

Arginine (pH 9.5) 3.03.0-

Water ← add to 100 → → mix

¹C_16-18Fatty alcohol (HENKEL)

²C_12-18Ester fatAlcohol (HENKEL)

³Cetyl stearyl alcohol (CTFA name: Ceteareth-20) (HENKEL) with about 20 moles of EO

Table 2: color [ chroma ]

Preparation of golden yellow human hair (Kerling natural white) Grey human hair (Klugmann natural middle gray)

Color #6623)

Yellow-dark golden yellow/medium brown/slightly bluish in E1

Gray, slightly blue (dull, medium brown)

Yellow/light brown/indeterminate in E2

Grayish bluish none visible bluish

C1 gold yellow/natural color reddish light brown

C2 light golden yellow-golden yellow/bluish dark golden yellow/bluish

C3 light golden/bluish dark golden/indeterminate

Slightly bluish without visibility

Claims (18)

1. A preparation for dyeing keratin fibers, especially human hair, contains a dye precursor selected from indoline derivatives and indole derivatives,

the indoline derivatives are 5, 6-dihydroxyindoline derivatives corresponding to the structural formula (1a), or physiologically acceptable salts of these compounds with inorganic or organic acids:

the indole derivatives are 5, 6-dihydroxyindole derivatives corresponding to the structural formula (1b), or physiologically acceptable salts of these compounds with inorganic or organic acids:

wherein the-groups are independent of one another

R¹Is a hydrogen atom, C_1-4Alkyl or C_1-4A hydroxyalkyl group;

R²is a hydrogen atom or-COOH, wherein-COOH may be present in the form of a physiologically compatible anionic salt;

R³is a hydrogen atom or C_1-4An alkyl group;

R⁴is a hydrogen atom, C_1-4Alkyl or-CO-R⁶Wherein R is⁶Is C_1-4An alkyl group;

R⁵represents the above-mentioned R⁴One of the groups;

said indoline derivatives and indole derivatives contain at least one optionally etherified or esterified hydroxyl group or at least one optionally alkylated amino group, respectively, as substituents on the six-membered ring, characterized in that they additionally contain at least one amino acid or one oligopeptide.

2. Formulation according to claim 1, characterized in that the pH of a 2.5% by weight aqueous solution of the amino acid or oligopeptide is higher than 9.

3. Formulation according to claim 1 or 2, characterized in that the amino acid is an α -amino acid.

4. A formulation according to claim 3, characterised in that the α -amino acid is selected from arginine, ornithine, lysine and histidine.

5. A formulation according to claim 4, characterised in that the α -amino acid is arginine.

6. Formulation according to claim 1, characterized in that said compound (1a) is selected from the group consisting of 5, 6-dihydroxyindoline, N-methyl-5, 6-dihydroxyindoline and physiologically compatible salts thereof.

7. Formulation according to claim 1, characterized in that the compound (1b) is selected from the group consisting of 5, 6-dihydroxyindole, N-methyl-5, 6-dihydroxyindole and physiologically compatible salts thereof.

8. The formulation of claim 1, characterized in that there are no oxidation dye precursors of the primary intermediate type.

9. The formulation of claim 1, characterized in that there are no oxidative dye precursors of the secondary intermediate type.

10. Formulation according to claim 1, characterized in that the formulation further comprises a secondary intermediate selected from the group consisting of 1-naphthol, 1, 5-, 2, 7-and 1, 7-dihydroxynaphthalene, 3-aminophenol, 5-amino-2-methylphenol, 2-amino-3-hydroxypyridine, resorcinol, 4-chlororesorcinol, 2-chloro-6-methyl-3-aminophenol, 2-methylresorcinol, 5-methylresorcinol, 2, 5-xylylresorcinol, 2, 6-dihydroxy-3, 4-diaminopyridine and physiologically compatible salts thereof.

11. The formulation of claim 1, characterized in that it contains a direct dye selected from the group consisting of: HC yellow 2, HC yellow 4, HC yellow 5, HC yellow 6, basic yellow 57, disperse orange 3, HC red BN, basic red 76, HC blue 2, HC blue 12, disperse blue 3, basic blue 99, HC violet 1, disperse violet 4, disperse black 9, basic brown 16 and basic brown 17, 4-amino-2-nitrodiphenylamine-2' -carboxylic acid, 6-nitro-1, 2, 3, 4-tetrahydroquinoxaline, hydroxyethyl-2-nitrotoluidine, picric acid, 2-amino-6-chloro-4-nitrophenol, 4-ethylamino-3-nitrobenzoic acid and 2-chloro-6-ethylamino-1-hydroxy-4-nitrobenzene.

12. The formulation of claim 1, characterized in that it comprises a dye selected from the group consisting of natural dyes: henna red, henna, camomile, sandalwood, black tea, alder bark, sage, logwood, madder root, catechu, sage and beefsteak root.

13. Preparation according to claim 1, characterized in that the indole or indoline derivative is present in an amount of 0.05 to 10% by weight, based on the total amount of the preparation.

14. Preparation according to claim 13, characterized in that the indole or indoline derivative is present in an amount of 0.2 to 5% by weight, based on the total amount of the preparation.

15. Formulation according to claim 1, characterized in that the amount of the amino acid or oligopeptide is 0.1 to 10% by weight, based on the total amount of the formulation.

16. Use of an amino acid or oligopeptide for enhancing and/or changing the colour when dyeing keratin fibres with a preparation comprising an indoline derivative or an indole derivative as a dye precursor; wherein the content of the first and second substances,

the indoline derivatives are 5, 6-dihydroxyindoline derivatives corresponding to the structural formula (1a), or physiologically acceptable salts of these compounds with inorganic or organic acids:

the indole derivatives are 5, 6-dihydroxyindole derivatives corresponding to the structural formula (1b), or physiologically acceptable salts of these compounds with inorganic or organic acids:

wherein the-groups are independent of one another

R¹Is a hydrogen atom, C_1-4Alkyl or C_1-4A hydroxyalkyl group;

R²is a hydrogen atom or-COOH, wherein-COOH may be present in the form of a physiologically compatible anionic salt;

R³is a hydrogen atom or C_1-4An alkyl group;

R⁴is a hydrogen atom, C_1-4Alkyl or-CO-R⁶Wherein R is⁶Is C_1-4An alkyl group;

R⁵represents the above-mentioned R⁴One of the groups.

17. A method of dyeing human hair using a preparation according to claim 1, characterized in that the development of the colour is carried out under the action of atmospheric oxygen.

18. The method of claim 17, wherein the final color is developed by repeated use of the formulation and air oxidation after each use.