GB2606244A - Two-component oxidation powder hair colour with thickener combination - Google Patents

Abstract

Kit for the oxidative dyeing of keratinous fibres, particularly human hair, comprising an anhydrous oxidising composition (OC) containing at least one solid water-activatable oxidising agent selected from sodium percarbonate and sodium perborate and no saccharides; separately from (OC) an anhydrous cosmetic colouring composition (DC) comprising at least one oxidation dye precursor of the developer type and at least one oxidation dye of the coupler type, at least one alkalizing agent selected from sodium silicates and sodium metasilicates, each having a molar SiO2/Na2O ratio from 2.5 to 3.7, at least one polysaccharide thickener selected from sodium carboxymethylcellulose and xanthan gum and mixtures thereof; wherein the kit does not comprise a component containing persulfates, and at least one of the (DC) or (OC) compositions contains precipitated silica as a thickening agent. Process for the oxidative dyeing of keratinous fibres using the above kit is also provided. Use of precipitated silica in a dyeing kit or process as defined above as a thickening agent is also disclosed. The (DC) composition may further comprise basic magnesium carbonate. The dyeing kit or process preferably contains no ammonium salt and/or no polymer or copolymer with acrylate, methacrylate or vintl containing monomers and no polyurethane.

Description

TWO-COMPONENT OXIDATION POWDER HAIR COLOUR WITH THICKENER COMBINATION

[1] The present invention is in the field of cosmetic hair dyeing and relates to a kit for oxidative dyeing of keratinous fibres, in particular human hair, comprising an anhydrous sodium percarbonatecontaining or sodium perborate-containing oxidation composition (OC) and, separately from the oxidation composition (OC), an anhydrous cosmetic dyeing composition (DC) containing oxidation dye precursors, a selected alkalizing agent based on selected sodium silicates or sodium metasilicates, at least one polysaccharide selected from sodium carboxymethylcellulose and xanthan gum and mixtures thereof as a first thickening agent and further precipitated silica as a further thickening agent, wherein an oxidative hair dyeing composition can be prepared by mixing the kit ingredients with water without the need for further addition of hydrogen peroxide.

[2] Another object of the present invention is a process for the oxidative dyeing of keratinous fibres, in particular human hair, using the aforementioned anhydrous kit components and water.

[3] Changing the colour of keratin fibres, especially hair, is a key area of modern cosmetics. As a result, the appearance of the hair can be adapted both to current fashion trends and to the individual wishes of the individual. The expert knows different possibilities for changing the hair colour.

[4] The hair colour can be changed temporarily by using direct dye. Here, already fully formed dyes from the dye diffuse into the hair fibre. The dyeing with direct dyes is associated with slight damage to the hair, but a disadvantage is the short shelf life and the quick washability of the dyeing's obtained with direct dyes.

[5] If the consumer desires a long-lasting colour result or a shade that is lighter than his original hair colour, oxidative colour change agents are therefore usually used. For permanent, intensive dyeing with corresponding fastness properties, so-called oxidation dyes are used. Such colourants usually contain oxidation dye precursors, so-called developer components and coupler components, which form the actual dyes with one another under the influence of oxidizing agents -usually hydrogen peroxide. Oxidation dyes are characterized by excellent, long-lasting dyeing results.

[6] Oxidative colour change agents usually come on the market in the form of two-component agents, in which two different preparations are packaged separately in two separate packages and are only mixed with one another shortly before use. The first component of common colourant kits is a water-containing composition -adjusted to be acidic for stability reasons -which contains dissolved hydrogen peroxide as oxidising agent in concentrations of 1.5 to 24 wt.%. This aqueous oxidant composition is often in the form of an emulsion or dispersion and is usually provided in a plastic bottle with a resealable outlet (developer bottle).

[7] This oxidant formulation of known staining kits is mixed with a second preparation before use. This second preparation is an alkaline formulation, often in the form of a cream or gel, which, if a colour change is desired at the same time as lightening, also contains at least one oxidation dye precursor. This second preparation is often packaged in a tube or in a plastic or glass container.

[8] In the usual form of application described above, the second preparation containing the alkalizing agent and, if desired, the oxidation dye precursors, is transferred from the tube or container to the developer bottle and then mixed by shaking with the hydrogen peroxide preparation already in the developer bottle. In this way, the application mixture is produced in the developer bottle. It is then applied to the hair via a small nozzle or outlet opening on the head of the developer bottle. The nozzle or outlet is opened after shaking and the application mixture can be removed by pressing the flexible developer bottle.

[9] When preparing the application mixture in a bowl, both components -the first preparation containing the oxidizing agent and the second preparation containing alkalizing agent and, if desired, oxidation dye precursors -are transferred completely into a bowl or similar vessel and mixed there, for example with the aid of a brush. The application mixture is then removed from the mixing bowl using the brush. With this form of application, the use of a voluminous and expensive developer bottle is not necessary.

[10] However, the filling of hydrogen peroxide solutions into such packaging is associated with problems, the cause of which lies in the reactivity of the hydrogen peroxide, which, depending on the storage conditions and on the presence of decomposing impurities, can gradually decompose to form oxygen (i.e. gas).

[11] The developer bottles known from the prior art are only filled to a maximum of half, usually only a third of their inner volume with the oxidizing agent composition. As a rule, developer bottles are made of polyethylene. Since polyethylene is permeable to both water vapor and gases, there is no or little excess pressure in the developer bottle. In addition, developer bottles are usually provided with sturdy, thick walls and a stable screw cap, so that diffusion of the water vapor or gases is reduced by the thickness of the walls and a pressure increase within the bottle that occurs to a small extent has no negative effects.

[12] As a result, the packaging is usually bulky, which compromises sustainability in terms of environmental protection and resource conservation. There would be an advantage if a solid were used as oxidant that could be activated by the addition of water alone, without the need to add further hydrogen peroxide. Sodium percarbonate and sodium perborate are known as solid oxidizing agents for dyeing preparations, for the activation of which the addition of water instead of a hydrogen peroxide solution is sufficient. These are salts. However, the use of salts is disadvantageous for the adjustment of the viscosity of the ready-to-use hair dye. Polyelectrolytes, such as xanthan gum, are often used as thickeners, which lose their effect of increasing viscosity with increasing salt content. If the ready-to-use hair dye has too low a viscosity, it is more difficult to apply and can drip off the hair more easily during the application time, which is undesirable.

[13] The task of the present application is to provide a hair dyeing composition comprising a solid oxidizing agent which can be activated with water, the hair dyeing composition having no disadvantages in terms of manageability, in particular with regard to the viscosity of the hair dyeing composition ready for use. Furthermore, the hair dye formulations should be packaged safely and in a space-saving manner in order to guarantee high storage stability and to provide a dyeing product that conserves resources as much as possible. Also, the application of the dye should be as safe as possible for the consumer.

[14] The problem underlying the invention is solved by a kit for the oxidative dyeing of keratinous fibres, in particular human hair, comprising (i) an anhydrous oxidising composition (0C) containing at least one solid water-activatable oxidising agent selected from sodium percarbonate and sodium perborate and no polysaccharides, (ii) separately from (OC), an anhydrous cosmetic dyeing composition (DC) comprising at least one oxidation dye precursor of the developer type and at least one oxidation dye precursor of the coupler type, furthermore at least one alkalizing agent selected from sodium silicates and sodium metasilicates, each having a molar Si02/Na20 ratio of from 0.8 to 3.7, preferably from 1.0 to 3.6, particularly preferably from 2.5 to 3.5, furthermore at least one polysaccharide thickener selected from sodium carboxymethylcellulose and xanthan gum and mixtures thereof, wherein the kit does not comprise a component containing persulfates, characterized in that at least one of the compositions (DC) or (OC) contains precipitated silica.

[15] Another object of the present invention is a method for oxidative dyeing of keratinous fibres, in particular human hair, comprising the following steps: (i) Providing an anhydrous oxidizing composition (OC) comprising at least one solid wateractivatable oxidizing agent selected from sodium percarbonate and sodium perborate and no polysaccharides, and separately therefrom providing an anhydrous cosmetic dyeing composition (DC), wherein the dyeing composition comprises (DC): at least one oxidation dye precursor of the developer type and at least one oxidation dye precursor of the coupler type, furthermore at least one alkalizing agent selected from sodium silicates and sodium metasilicates, each having a molar Si02/Na20 ratio of from 0.8 to 3.7, preferably from 1.0 to 3.6, particularly preferably from 2.5 to 3.5, furthermore -as a thickener, at least one polysaccharide selected from sodium carboxymethylcellulose and xanthan and mixtures thereof, (ii) Mixing of the composition (OC), the cosmetic dyeing composition (DC) and water to form a ready-to-use colouring agent, (Hi) directly following step (ii), applying the ready-to-use colorant to keratinous fibres, in particular to human hair, (iv) Leaving the ready-to-use colorant on the keratinous fibres, in particular on human hair, for 5 to 60 minutes, preferably for 15 to 45 minutes, particularly preferably for 30 minutes, (v) then rinsing the colorant from the keratinous fibres with water, optionally washing the fibres with a surfactant-containing detergent, conditioning the fibres with a conditioning agent, and/or drying the fibres, whereby no persulfates are used in the process, characterized in that the weight ratio of the sum of the weight of the compositions (OC) and (DC) to the weight of the amount of water used in step (ii), ROCHDC)]/[water], is in the range of 10:100 to 28:100, preferably 11:100 to 24:100, more preferably 12:100 to 22: 100, more preferably 13:100 to 20:100, further particularly preferred 14:100 to 19.6: 100, exceptionally preferably 16:100 to 18.1:100, further characterized in that at least one of the compositions (DC) or (OC) contains precipitated silica as a thickening agent.

[16] Keratinic fibres, keratin containing fibres or keratin fibres are to be understood as furs, wool, feathers and in particular human hair. Although the agents according to the invention are primarily suitable for lightening and dyeing keratin fibres, in principle there is nothing to prevent their use in other areas.

[17] The kit according to the invention is a kit for oxidative coloration of keratinous fibres, that is, a product that is applied to the human head after mixing with water to obtain oxidative colouring or nuancing of the hair. In this context, shading is understood to mean colouring in which the colour result is lighter than the original hair colour. Throughout this application, the term "cosmetic dyeing composition (DC)" is used synonymously with the terms "preparation (DC)" or "colouring composition (DC)." [18] The kit according to the invention comprises, as a first ingredient, an anhydrous oxidation composition (OC) containing at least one solid water-activatable oxidizing agent selected from sodium percarbonate and sodium perborate, and no polysaccharides.

[19] The compositions (OC) and (DC) of the dyeing kits according to the invention and preferred according to the invention, designated as "anhydrous", have a water content of 0 to 8% by weight, preferably 0.1 to 5% by weight, particularly preferably 0.5 to 2.5% by weight, of water, in each case based on the weight of the compositions (OC) or (DC). With the above water contents in the range of 0 to 8% by weight, compositions (OC) and (DC) are by definition considered anhydrous within the meaning of the present application. These figures refer to the content of free water. Not considered is the content of molecularly bound water or water of crystallization, which individual powder components may have. The water content can be measured with a moisture analyser or moisture meter, for example a moisture meter from Mettler, model Mettler HS 153, where the loss on drying is determined at 105°C, shut-off criterion 50 seconds with a product weight of 1 to 1.5 grams.

[20] In one embodiment of the invention, the anhydrous oxidation composition (OC) of the staining kit according to the invention and preferred according to the invention contains the solid oxidant sodium percarbonate. Sodium percarbonate is understood to be an H202 adduct with the formula 2 Na2CO3-3 H202. When mixed with the alkalizing agent-containing colorant composition (DC) and water, the ready-to-use colorant is formed, in which the sodium percarbonate exerts its action as an oxidizing agent.

[21] Dyeing kits preferred according to the invention and dyeing processes preferred according to the invention are characterized in that sodium percarbonate is present in the oxidation composition (OC) in a total amount of 20 -100% by weight, preferably 40 -90% by weight, preferably from 45 to 80% by weight, in particular from 55 to 70% by weight, based on the weight of the oxidation composition (OC).

[22] According to the invention, it may be exceptionally preferred that the sodium percarbonate is present in the oxidation composition (OC) in a total amount of 100% by weight, based on the weight of the oxidation composition (OC).

[23] In a further preferred embodiment of the dyeing kit according to the invention and of the dyeing process according to the invention, the sodium percarbonate is present in coated form, preferably coated with at least one salt selected from sodium carbonate, sodium hydrogen carbonate or sodium chloride and mixtures of these salts.

[24] A further preferred embodiment of the dyeing process according to the invention is characterized in that the ready-to-use colorant contains 1.0-7.0% by weight, preferably 1.5-6.0% by weight, preferably 2.5 to 5.2% by weight, in particular 2.7 to 4.7% by weight, exceptionally preferably 3.0 to 3.6% by weight of sodium percarbonate, in each case based on the weight of the ready-to-use colorant.

[25] In another embodiment of the invention, the anhydrous oxidation composition (OC) of the staining kit according to the invention and preferred according to the invention comprises the solid oxidant sodium perborate. When mixed with the colouring composition containing alkalising agent (DC) and water, the ready-to-use colouring agent is formed, in which the sodium perborate develops its effect as an oxidising agent.

[26] Dyeing kits preferred according to the invention and dyeing processes preferred according to the invention are characterized in that sodium perborate is present in the oxidation composition (0C) in a total amount of 20-100% by weight, preferably 40-90% by weight, preferably from 45 to 80% by weight, in particular from 55 to 70% by weight, based on the weight of the oxidation composition (0C).

[27] According to the invention, it may be exceptionally preferred that the sodium perborate is present in the oxidation composition (OC) in a total amount of 100% by weight, based on the weight of the oxidation composition (0C).

[28] A further preferred embodiment of the colouring process according to the invention is characterised in that the colouring agent ready for use contains 1.0-7.0% by weight, preferably 1.5 -6.0% by weight, preferably 2.5 to 5.2% by weight, in particular 2.7 to 4.7% by weight, exceptionally preferably 3.0 to 3.6% by weight of sodium perborate, in each case based on the weight of the colouring agent ready for use.

[29] By using the at least one solid water-activatable oxidizing agent selected from sodium percarbonate and sodium perborate, the addition of a hydrogen peroxide solution can be eliminated. The staining kits according to the invention are thus more stable in storage and safer compared to staining kits comprising a hydrogen peroxide solution. Persulfates, such as sodium persulfate, ammonium persulfate and potassium persulfate, cannot be activated with water alone, but require the addition of a solution containing hydrogen peroxide. The dyeing kits and dyeing processes according to the invention are therefore persulfate-free.

[30] The aggregate state "solid" refers to standard conditions, i.e. 20°C and 105 Pa. Unless otherwise stated, all data concerning the state of aggregation refer to these standard conditions.

[31] The oxidation composition (OC) according to the invention is further characterised in that it does not contain a polysaccharide. Surprisingly, it was found that the joint storage of an oxidising agent selected from sodium percarbonate and sodium perborate with polysaccharides entails disadvantages in long-term stability for both ingredients.

[32] One embodiment of the invention is characterised in that the oxidation composition (0C) according to the invention contains precipitated silica as a thickening agent. The precipitated silica used according to the invention is present as a powder. Precipitated silica preferred according to the invention has a tamped density in the range of 100 -400 g/1, preferably in the range of 200-300 g/I, particularly preferably in the range of 230 -260 g/1, preferably measured according to DIN ISO 787-11 of October 1995. Precipitated silica preferred according to the invention is further characterised in that its 5% by weight suspension reacts weakly acidic in water, that is, has a pH value in the range of 6.0 -6.9, preferably in the range of 6.3 -6.7, extremely preferably of 6.5, preferably measured according to DIN ISO 787-9 of September 2019.

[33] The use of precipitated silica as a thickening agent result in a stable, salt content-independent viscosity of the ready-to-use colourant obtained from mixing the oxidation composition (OC) with the colouring composition (DC) and water. This improves the application properties of the final product, as it allows the ready-to-use colourant to remain on the hair during the application time without dripping off. Another advantage of precipitated silica as a thickener is its ecological balance: the raw material is based on natural raw materials and is not a microplastic.

[34] Dyeing kits and dyeing methods preferred according to the invention are characterized in that the anhydrous oxidation composition (0C) contains precipitated silica as a thickening agent in a concentration of 0.2 to 80.0% by weight, preferably 1.0 to 60% by weight, particularly preferably 525% by weight, exceptionally preferably 8-15% by weight, in each case based on the weight of the oxidation composition (OC).

[35] An alternative embodiment of the invention is characterised in that the dyeing composition (DC) according to the invention contains precipitated silica as a thickening agent. The precipitated silica to be used in (DC) has the same characteristics as disclosed above in connection with (OC).

[36] Dyeing kits and dyeing methods preferred according to the invention are characterised in that the anhydrous dyeing composition (DC) contains precipitated silica as a thickening agent in a concentration of 0.2 to 50.0% by weight, preferably 1.0 to 35% by weight, particularly preferably 5 -10% by weight, in each case based on the weight of the dyeing composition (DC).

[37] Further dyeing kits and dyeing methods preferred according to the invention are characterized in that the anhydrous dyeing composition (DC) contains precipitated silica as thickening agent in a concentration of 0.2 to 50.0% by weight, preferably 1.0 to 35% by weight, particularly preferably 5-10 wt. %, in each case based on the weight of the dyeing composition (DC), and the anhydrous oxidation composition (OC) contains precipitated silica as thickener in a concentration of 0.2 to 80.0% by weight, preferably 1.0 to 60% by weight, particularly preferably 5 -25 % by weight, exceptionally preferably 8 -15 % by weight, in each case based on the weight of the oxidation composition (OC).

[38] In another preferred embodiment of the dyeing kit according to the invention and the dyeing process according to the invention, the oxidation composition (OC) comprises at least one auxiliary selected from fillers, anti-caking agents and drying agents as well as mixtures of these auxiliaries.

These excipients are intended to prevent clumping or caking of the powder components of the anhydrous compositions (OC) and (DC).

[39] Particularly preferred fillers are selected from sodium sulphate and sodium chloride and mixtures thereof. Sodium chloride is particularly preferred because it can enhance the oxidation effect of sodium percarbonate. This is particularly desirable for achieving light colour tones.

[40] Particularly preferred anti-caking agents are selected from fumed silica, diatomaceous earth, calcium phosphate, calcium silicates, aluminium oxide, magnesium oxide, magnesium carbonate, zinc oxide, stearates, and mixtures thereof.

[41] Particularly preferred desiccants are selected from sodium sulphate, sodium carbonate, magnesium sulphate, calcium chloride and fumed silica, and mixtures thereof.

[42] Dyeing kits preferred according to the invention and dyeing processes preferred according to the invention are characterized in that the oxidation composition (OC) contains at least one auxiliary selected from fillers, anti-caking agents and drying agents as well as mixtures of these auxiliaries in a total amount of 0.5-80% by weight, preferably 5 -65% by weight, preferably from 10 to 55% by weight, in particular from 20 to 35% by weight, based on the weight of the oxidation composition (OC).

[43] The anhydrous dyeing composition (DC) of the dyeing kit according to the invention and preferred according to the invention contains at least one oxidation dye precursor of the developer type (developer component) and at least one oxidation dye precursor of the coupler type (coupler component).

[44] Developer components preferred according to the invention are selected from the group formed by toluene-2,5-diamine, 2-methoxymethyl-p-phenylenediamine, 2-(2,5-diaminophenyl)ethanol, p-phenylenediamine, 2-(1,2-dihydroxyethyl)-p-phenylenediamine, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, 4,5-diamino-1-(2-hydroxyethyl)-1H-pyrazole, 4-aminophenol, 3-methyl-4-aminophenol, N-(4-amino-3-methylpheny1)-N-[3-(1H-imidazol-1-yl)propyl]amine, N,1\11-bis(2-hydroxyethyl)-N, N'-bis-(4-aminopheny1)-1,3-diamino-propan-2-ol, bis-(2-hydroxy-5-aminophenyl)methane, 1,3-bis-(2,5-diaminophenoxy)propan-2-ol, N,Nr-bis-(4-aminopheny1)-1,4-diazacycloheptane, 1,10-bis-(2,5-diaminopheny1)-1,4,7,10-tetraoxadecane, 2, 4,5,6-tetraaminopyrimidine, 4-hydroxy-2,5,6-triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo-[1,2-a]-pyrazol-1-one and physiologically tolerated salts and mixtures thereof.

[45] Preferred physiologically acceptable salts of the oxidation dye precursors having one or more amine groups are in particular the hydrochlorides (monohydrochloride x HCI, or dihydrochloride x 2 HCI), the sulphate (x H2504), and the hydrobromides (monohydrobromide x HBr, or dihydrobromide x 2 HBr) of the compound.

[46] Dyeing kits preferred according to the invention and dyeing methods preferred according to the invention are characterized in that the dyeing composition (DC) comprises at least one developer component selected from toluene-2,5-diamine, 2-methoxymethyl-p-phenylenediamine, 2-(2, 5-diaminophenyl)ethanol, p-phenylenediamine, 2-(1,2-dihydroxyethyl)-p-phenylenediamine, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, 4, 5-diamino-1-(2-hydroxyethyl)-1H-pyrazole, 4-aminophenol, 3-methyl-4-aminophenol, N-(4-amino-3-methylphenyI)-N-[3-(1H-imidazol-1-yl)propyl]amine, N,N1-bis(2-hydroxyethyl)-N,N1-bis-(4-aminopheny1)-1,3-diamino-propan-2-ol, bis-(2-hydroxy-5-aminophenyl)methane, 1,3-bis-(2, 5-diaminophenoxy)propan-2-ol, N,N1-bis-(4-aminopheny1)-1,4-diazacycloheptane, 1,10-bis-(2,5-diaminophenyI)-1,4,7,10-tetraoxadecane, 2,4,5, 6-tetraaminopyrimidine, 4-hydroxy-2,5,6-triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo-[1,2-a]-pyrazol-1-one and physiologically acceptable salts and mixtures thereof, in a total amount of 0.1 -40 wt. -%, preferably 1 -30 % by weight, particularly preferably 5 -25 % by weight, exceptionally preferably 10 -20 % by weight, in each case based on the weight of the anhydrous dyeing composition (DC).

[47] Coupler-type oxidation dye precursors preferred according to the invention are selected from the group formed from 5-amino-2-methylphenol, 3-amino-2-chloro-6-methylphenol, 2-hydroxy-4-aminophenoxyethanol, 5-amino-4-chloro-2-methylphenol, 5-(2-hydroxyethynamino-2-methylphenol, 2,4-dichloro-3-aminophenol, 2-aminophenol, 3-phenylenediamine, 2-(2, 4-diaminophenoxy)ethanol, 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-methylbenzene, 2-({3-[(2-hydroxyethypamino]-4-methoxy-5-methylphenyllamino)ethanol, 2-({3-[(2-hydroxyethyl)amino]-2-methoxy-5-methylphenyllamino)ethanol, 2-({3-[(2-hydroxyethyl)amino]-4, 5-dimethylphenyl}amino)ethanol, 2-[3-morpholin-4-ylphenyl)amino]ethanol, 3 amino 4 (2 methoxyethoxy)-5-methylphenylamine, 1-amino-3-bis-(2-hydroxyethyliaminobenzene, resorcinol, 2-methylresorcinol, 4-chlororesorcinol, 1,2,4-trihydroxybenzene, 2-amino-3-hydroxypyridine, 3-amino2-methylamino-6-methoxypyridine, 2,6-dihydroxy-3,4-dimethylpyridine, 3,5-diamino-2, 6-dimethoxypyridine, 1-phenyl-3-methylpyrazol-5-one, 1-naphthol, 1,5-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, 1,8-dihydroxynaphthalene, 4-hydroxyindole, 6-hydroxyindole, 7-hydroxyindole, 4-hydroxyindoline, 6-hydroxyindoline, 7-hydroxyindoline or mixtures of these compounds or their physiologically tolerated salts.

[48] Dyeing kits preferred according to the invention and dyeing methods preferred according to the invention are characterized in that the dyeing composition (DC) comprises at least one coupler component selected from 5-amino-2-methylphenol, 3-amino-2-chloro-6-methylphenol, 2-hydroxy-4-aminophenoxyethanol, 5-amino-4-chloro-2-methylphenol, 5-(2-hydroxyethyl)amino-2-methylphenol, 2, 4-dichloro-3-aminophenol, 2-aminophenol, 3-phenylenediamine, 2-(2,4-diaminophenoxy)ethanol, 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-methylbenzene, 2-({3-[(2-hydroxyethypamino]-4-methoxy-5-methylphenyllamino)ethanol, 2-({3-[(2-hydroxyethyl)amino]-2-methoxy-5-methylphenyllamino)ethanol, 2-(13-[(2-hydroxyethyl)amino]-4,5-dimethylphenyllamino)ethanol, 2-[3-morpholin-4-ylphenyl)amino]ethanol, 3-amino-4-(2-methoxyethoxy)-5-methylphenylamine, 1-amino-3-his-(2-hydroxyethyl)aminobenzene, resorcinol, 2-methylresorcinol, 4-chlororesorcinol, 1,2,4-trihydroxybenzene, 2-amino-3-hydroxypyridine, 3-amino2-methylamino-6-methoxypyridine, 2,6-dihydroxy-3,4-dimethylpyridine, 3,5-diamino-2, 6-dimethoxypyridine, 1-phenyl-3-methylpyrazol-5-one, 1-naphthol, 1,5-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, 1,8-dihydroxynaphthalene, 4-hydroxyindole, 6-hydroxyindole, 7-hydroxyindole, 4-hydroxyindoline, 6-hydroxyindoline, 7-hydroxyindoline or mixtures of these compounds or physiologically tolerated salts thereof, in a total amount of 0.1 -40 wt. -%, preferably 1 -20 % by weight, particularly preferably 5 -15 % by weight, exceptionally preferably 6 -10 % by weight, in each case based on the weight of the anhydrous dyeing composition (DC).

[49] Dyeing kits preferred according to the invention and dyeing methods preferred according to the invention are characterised in that the dyeing composition (FZ) contains one or more direct dyes. Preferred non-ionic direct dyes are selected from the group consisting of HC Yellow 2, HC Yellow 4, HC Yellows, HC Yellow 6, HC Yellow 12, HC Orange 1, Disperse Orange 3, HC Red 1, HC Red 3, HC Red 7,HC Red 10, HC Red 11, HC Red 13, HC Red BN, HC Blue 2, HC Blue 11, HC Blue 12, Disperse Blue 3, HC Violet 1, Disperse Violet 1, Disperse Violet 4, Disperse Black 9, 1,4-diamino-2-nitrobenzene, 2-amino-4-nitrophenol, 1,4-bis(2-hydroxyethyl)amino-2-nitrobenzene, 3-nitro-4-(2-hydroxyethyl)aminophenol, 2-(2-hydroxyethyl)amino-4,6-dinitrophenol, 4-[(2-hydroxyethyl)amino]-3-nitro-1-methylbenzene, 1-amino-4-(2-hydroxyethyl)amino-5-chloro-2-nitrobenzene, 4-amino-3-nitrophenol, 1-(2'-ureidoethyl)amino-4-nitrobenzene, 2-[(4-amino-2-nitrophenyl)amino]benzoic acid, 4-[(3-hydroxypropyl)amino]-3-nitrophenol, 4-nitro-o-phenylenediamine, 6-nitro-1,2,3,4-tetrahydroquinoxaline, 2-hydroxy-1,4-naphthoquinone, picramic acid and its salts, 2-amino-6-chloro4-nitrophenol, 4-ethylamino-3-nitrobenzoic acid and 2-chloro-6-ethylamino-4-nitrophenol.

[50] Preferred anionic direct dyes are selected from the group consisting of Acid Yellow 1, Yellow 10, Acid Yellow 23, Acid Yellow 36, Acid Orange 7, Acid Red 33, Acid Red 52, Pigment Red 57:1, Acid Blue 7, Acid Green 50, Acid Violet 43, Acid Black 1, Acid Black 52, Bromophenol Blue and Tetrabromophenol Blue.

[51] Suitable cationic direct dyes are cationic triphenylmethane dyes, such as Basic Blue 7, Basic Blue 26, Basic Violet 2 and Basic Violet 14, aromatic systems substituted with a quaternary nitrogen group, such as Basic Yellow 57, Basic Red 76, Basic Blue 99, Basic Brown 16 and Basic Brown 17, cationic anthraquinone dyes such as HC Blue 16 (Bluequat B) and direct dyes containing a heterocycle containing at least one quaternary nitrogen atom, in particular Basic Yellow 87, Basic Orange 31 and Basic Red 51. The cationic direct dyes marketed under the trademark Arianor are also suitable cationic direct dyes according to the invention.

[52] The dyeing composition (DC) according to the invention is further characterized in that it comprises at least one alkalizing agent selected from sodium silicates and sodium metasilicates, each having a molar Si02/Na20 ratio of from 0.8 to 3.7, preferably from 1.0 to 3.6, more preferably from 2.5 to 3.5. These solid alkalising agents can be conveniently incorporated into the anhydrous dyeing composition (DC). When dissolving the dyeing composition (DC) in water, these alkalising agents produce the alkaline pH value necessary for the activation of the sodium percarbonate.

[53] Dyeing kits preferred according to the invention and dyeing processes preferred according to the invention are characterized in that the dyeing composition (FZ) comprises at least one alkalizing agent selected from sodium silicates and sodium metasilicates, each having a molar Si02/Na20 ratio of from 0.8 to 3.7, preferably from 1.0 to 3.6, most preferably from 2.5 to 3.5, in a total amount of from 5 -50 wt. %, preferably 8 -40 % by weight, particularly preferably 10 -35 % by weight, exceptionally preferably 15 -25 % by weight, in each case based on the weight of the anhydrous dyeing composition (DC).

[54] A further preferred embodiment of the dyeing process according to the invention is characterized in that the ready-to-use dyeing composition contains at least one alkalizing agent selected from sodium silicates and sodium metasilicates, each having a molar Si02/1\la20 ratio of from 0.8 to 3.7, preferably from 1.0 to 3.6, particularly preferably from 2.5 to 3.5, in a total amount of from 0.8 to 5.0% by weight, preferably from 1.0 to 4.0% by weight, particularly preferably from 1.2 to 3.5% by weight, in each case based on the weight of the ready-to-use dyeing composition. %, preferably 1.0 -4.0 wt.%, particularly preferably 1.2 to 3.5 wt.%, in each case based on the weight of the readyto-use colorant.

[55] Further dyeing kits preferred according to the invention and dyeing processes preferred according to the invention are characterized in that the dyeing composition (DC) contains basic magnesium carbonate (magnesium carbonate hydroxide) as secondary alkalizing agent. Basic magnesium carbonate (magnesium carbonate hydroxide) has several advantages in the context of the invention: it has a weaker alkaline effect than the sodium silicates and sodium metasilicates, which each have a molar Si02/Na20 ratio of 0.8 to 3.7, preferably of 1.0 to 3.6, particularly preferably of 2.5 to 3.5, and thus buffers the alkalinity of the colouring agent ready for use. Adjusting the preferred pH of the ready-to-use colorant according to the invention with one of the above-mentioned sodium (meta)silicates alone can lead to undesirable foaming when preparing the application mixture. This is slowed down by the addition of basic magnesium carbonate (magnesium carbonate hydroxide). In addition, basic magnesium carbonate (magnesium carbonate hydroxide) has particularly good adsorption properties. This can be used to remove dust from the anhydrous dyeing composition (DC) with an oil. The adsorption of an oil added for dust removal binds the fine powder particles of the individual components of the dyeing composition (DC), so that a low-dust or dust-free powder is obtained. In addition, the ready-to-use colorant forms a fine creamy mass in the presence of basic magnesium carbonate (magnesium carbonate hydroxide).

[56] Dyeing kits preferred according to the invention and dyeing processes preferred according to the invention are characterized in that the dyeing composition (DC) contains 5-16 wt.%, preferably 6 -14 wt.%, particularly preferably 8-11 wt.% basic magnesium carbonate (magnesium carbonate hydroxide), in each case based on the weight of the anhydrous dyeing composition (DC).

[57] A further preferred embodiment of the colouring process according to the invention is characterised in that the colouring agent ready for use contains 0.5 -2.0 wt.%, preferably 0.6-1.2 wt.%, particularly preferably 0.7 to 1.0 wt.% basic magnesium carbonate (magnesium carbonate hydroxide), in each case based on the weight of the colouring agent ready for use.

[58] The anhydrous dyeing composition (DC) of the dyeing kit according to the invention and preferred according to the invention further comprises at least one polysaccharide as thickening agent selected from sodium carboxymethylcellulose and xanthan and mixtures thereof.

[59] Dyeing kits preferred according to the invention and dyeing methods preferred according to the invention are characterised in that the anhydrous cosmetic dyeing composition (DC) and the anhydrous composition (OC) containing sodium percarbonate are present in a weight ratio to each other of [DC]/[OC] in the range from 1:1 to 6:1, preferably from 1.1:1 to 4:1, particularly preferably from 1.5:1 to 3: 1 are present.

[60] The combination of the thickening agent and the alkalizing agent used according to the invention leads to easier handling of the ready-to-use colorant which can be prepared from the kit according to the invention and water.

[61] When mixing the anhydrous kit ingredients of the invention (OC) and (DC) water, the mixture remains low viscosity in the first few seconds of mixing, so mixing can be performed easily and quickly. The viscosity then increases, and the ready-to-use dye can be applied to the keratinous fibres due to the higher viscosity. After the usual time required for mixing and application, a viscosity maximum is reached. Then already applied mixture does not drip from the hair. Since the combination of thickener and alkalizing agent used according to the invention causes the viscosity of the ready-to-use agent to develop only gradually, the ready-to-use colorant that can be prepared from the kit according to the invention is more manageable.

[62] According to the invention, the term "xanthans" refers to naturally occurring polysaccharides that can be obtained from sugar-containing substrates with the aid of bacteria of the genus Xanthomonas. Preferably, the xanthan gum used according to the invention contains d-glucose, d-mannose, d-glucuronic acid, acetate and pyruvate in a molar ratio of 28: 30:20: 17: 5,1-6,3, with the main chain consisting of I3-1,4-linked glucose units (also known as the cellulose chain). The xanthanes which are particularly preferred in the context of the present invention have the CAS No. 11138-66-2 and the following structural formula CH2OHCH-0H

OH OH

H2OR.1 R2,R = Na, K. 1120a 0 = H -CCH3 p oim / CO / L0

OH

H20 OH or 0 0 R2,R3= H 0 Hr). R, = H. Rs = -C CHs [63] Xanthan gum is a polyelectrolyte due to the presence of carboxylate groups.

[64] In the context of the present invention, the use of xanthans, at least 95 wt.% of which have a particle diameter of less than 0.180 mm mesh size in powder form and whose 1 wt.% solution in an aqueous 1 wt.% KCI solution (potassium chloride) has a viscosity of 1400-1600 mPa s (measured with Brookfield LVTD, spindle 3, 60 rpm, 25°C), has been shown to be particularly advantageous. Such xanthans are commercially available, for example, under the trade name Keltrol CG-SFT from CE' Kelco.

[65] The thickener sodium carboxymethylcellulose (INCI: Cellulose Gum) is commercially available, for example, under the trade name "Cekol 50000".

[66] Dyeing kits preferred according to the invention and dyeing processes preferred according to the invention are characterized in that the dyeing composition (DC) comprises, in each case based on its weight, 5 -25% by weight, preferably 10 -22% by weight, particularly preferably 12 -19% by weight. %, exceptionally preferably 13-18 wt.% sodium carboxymethyl cellulose.

[67] Further dyeing kits preferred according to the invention and dyeing processes preferred according to the invention are characterized in that the dyeing composition (DC) contains, in each case based on its weight, 2-10% by weight, preferably 3 -8% by weight, particularly preferably 4 -7% by weight, exceptionally preferably 5.5 -6% by weight of xanthan gum.

[68] Further dyeing kits preferred according to the invention and dyeing processes preferred according to the invention are characterized in that the dyeing composition (DC) comprises, in each case based on its weight, 5 -25% by weight, preferably 10-22% by weight, particularly preferably 12 -19% by weight. %, exceptionally preferably 13 -18 wt.% sodium carboxymethyl cellulose and 2-10 wt.%, preferably 3-8 wt.%, particularly preferably 4 -7 wt.%, exceptionally preferably 5.5 -6 wt.% xanthan gum.

[69] Further dyeing kits preferred according to the invention and dyeing methods preferred according to the invention are characterised in that the dyeing composition (DC) comprises as thickening agent a mixture of sodium carboxymethylcellulose and xanthan gum, the weight ratio of sodium carboxymethylcellulose to xanthan gum being in the range from 2.5:1 to 5:1, preferably from 3:1 to 4.3:1.

[70] A further preferred embodiment of the colouring process according to the invention is characterised in that the colouring agent ready for use contains 0.4 -3.0 wt.%, preferably 0.8 -2.6 wt.%, particularly preferably 1.2 -2.2 wt.% sodium carboxymethyl cellulose, in each case based on the weight of the colouring agent ready for use.

[71] A further preferred embodiment of the colouring process according to the invention is characterised in that the colouring agent ready for use contains 0.1-1.2 wt.%, preferably 0.3-1.0 wt.%, particularly preferably 0.4 to 0.6 wt.% xanthan gum, in each case based on the weight of the colouring agent ready for use.

[72] A further preferred embodiment of the dyeing process according to the invention is characterised in that the ready-to-use dyeing composition contains 0.4 -3.0 % by weight, preferably 0.8 -2.6 % by weight, particularly preferably 1.2-2.2% by weight of sodium carboxymethyl cellulose and 0.1 -1.2 % by weight, preferably 0.3 -1.0% by weight, particularly preferably 0.4 to 0.6% by weight of xanthan gum, in each case based on the weight of the ready-to-use colourant.

[73] Further dyeing kits preferred according to the invention and dyeing methods preferred according to the invention are characterised in that no ammonium salt is contained.

[74] Further dyeing kits preferred according to the invention and dyeing methods preferred according to the invention are characterised in that no polymer or copolymer with acrylate-, methacrylate-or vinyl-containing monomers and no polyurethane is contained.

[75] Anhydrous oxidation compositions (OC) preferred according to the invention and anhydrous dyeing compositions (DC) preferred according to the invention each have a bulk density in the range of 450 to 1000 g/I (gram/litre), preferably 500 to 950 el, particularly preferably 550 to 900 g/I. The determination of the bulk density is preferably conducted according to EN ISO 60, January 2000.

[76] Unless otherwise stated, all temperature specifications refer to a pressure of 1013 mbar.

[77] A further preferred embodiment of the dyeing process according to the invention is characterized in that the ready-to-use dye has a viscosity in the range of 10-100 Pa s, preferably 20 -85 Pa s, particularly preferably 40 -80 Pa s, exceptionally preferably 60 -75 Pa s, in each case measured at 20°C with a Brookfield rotational viscometer, model LVDVII+, spindle 5,4 revolutions per minute (rpm).

[78] The dyeing process according to the invention is characterized in that the weight ratio of the sum of the weight of the compositions (OC) and (DC) to the weight of the amount of water used for the preparation of the ready-to-use dye according to the invention, ROCHDC)]/[water], is in the range of 10:100 to 28:100, preferably 11:100 to 24:100, more preferably 12:100 to 22: 100, more preferably 13:100 to 20:100, further particularly preferred 14:100 to 19.6: 100, exceptionally preferably 16:100 to 18.1:100.

[79] Further dyeing kits preferred according to the invention and dyeing processes preferred according to the invention are characterised in that the anhydrous oxidation composition (OC) and/or the anhydrous dyeing composition (DC) additionally contain a dedusting agent which prevents dust formation of the powdery components. In particular, oils can be used as dedusting agents, especially oils selected from kerosene oil, silicone oil or ester oil as well as mixtures of these oils, kerosene oil being particularly preferred.

[80] Further dyeing kits preferred according to the invention and dyeing processes preferred according to the invention are characterized in that the dyeing composition (DC) contains, in each case based on its weight, at least one oil in a total amount of 0.1-10.0% by weight, preferably 1.0 -6.0% by weight, particularly preferably 2.0-3.0% by weight.

[81] Further dyeing kits preferred according to the invention and dyeing processes preferred according to the invention are characterised in that the dyeing composition (DC) contains, in each case based on its weight, paraffin oil in a total amount of 0.1-10.0% by weight, preferably 1.0-6.0% by weight, particularly preferably 2.0-3.0% by weight.

[82] Further dyeing kits preferred according to the invention and dyeing methods preferred according to the invention are characterised in that the anhydrous dyeing composition (DC) contains one or more acids which are present as a solid under standard conditions. Such an acid, in combination with the alkalizing agent, allows improved buffering of the pH of the ready-to-use colorant. It is therefore preferred in the context of the present invention that the anhydrous dyeing composition (DC) additionally contains at least one acid selected from the group consisting of succinic acid, dipicolinic acid, citric acid, malic acid, maleic acid and/or tartaric acid.

[83] Oxidative staining processes on keratin fibres usually take place in an alkaline environment. To protect the keratin fibres and also the skin as much as possible, the adjustment of a too high pH-value is however not desirable. It is therefore preferred if the pH of the ready-to-use colorant which can be prepared from the kit according to the invention or preferred kit according to the invention is in the range from 7 to 11, preferably in the range from 8 to 11.0, particularly preferably in the range from 9 to 10.5, exceptionally preferably in the range from 9.3 to 10.0, in each case measured at a temperature of 20°C.

[84] The anhydrous dyeing composition (DC) may further contain additional active ingredients, auxiliaries and additives. For example, it may contain one or more fat components from the group of C12-C30-Fatty alcohols C12-C30-Fatty acid triglycerides, C12-C33-Fatty acid monoglycerides, C12-C30-Fatty acid diglycerides and/or hydrocarbons.

[85] Preferably, the anhydrous dyeing composition (DC) may additionally contain a surface-active substance, such surface-active substances being referred to as surfactants or as emulsifiers, depending on the field of application: They are preferably selected from anionic, zwitterionic, amphoteric and non-ionic surfactants and emulsifiers.

[86] Furthermore, the anhydrous dyeing composition (DC) can contain further active ingredients, auxiliaries and additives, such as, for example, non-ionic polymers such as, for example, polyethylene glycols that are solid under standard conditions, quaternized cellulose ethers, hair-conditioning compounds such as phospholipids, for example lecithin; Perfume oils, active substances which improve the structure of the fibre, in particular mono-, di-and oligosaccharides such as, for example, glucose, galactose, fructose, fruit sugar and lactose; dyes for colouring the agent; Amino acids and oligopeptides; Protein hydrolysates based on animals and/or plants, and in the form of their fatty acid condensation products or optionally anionically or cationically modified derivatives; Fatty substances and vegetable oils; Active ingredients such as panthenol, pantothenic acid, pantolactone, pyrrolidinone carboxylic acids and their salts; Ceramides or pseudoceramides; Vitamins, provitamins and vitamin precursors; Plant extracts; Fats and waxes such as fatty alcohols, beeswax, montan wax and paraffins..

[87] With regard to further preferred embodiments of dyeing methods according to the invention and preferred according to the invention, what has been said about the dyeing kits according to the invention and preferred according to the invention applies mutatis mutandis.

[88] Another object of the present invention is the use of precipitated silica in dyeing kits according to the invention and preferred dyeing methods according to the invention as a thickening agent. What has been said about preferred embodiments of precipitated silica applies mutatis mutandis to preferred uses according to the invention as a thickening agent.

[89] The following examples explain the present invention without limiting it: Examples: (all quantities in grams) Example 1 Example 2 Example 3 Example 4 Oxidation composition (0C) 6.000 6.000 9.500 13.000 Sodium percarbonate 4.000 4.000 2.000 6.000 Sodium sulphate 2.000 Sodium chloride 2.000 2.000 4.000 Sipernate 22 5.500 3.000 (INCI: Silica, precipitated silicon dioxide) Dyeing composition (DC) 10.000 10.000 12.500 15.000 basic magnesium carbonate 1.000 1.000 0.900 1.000 (magnesium carbonate hydroxide) heavy pharm. 400 g/I Sipernate 22 0.500 0.500 0.035 5.100 Aeroperl 300/30 (INCI: Silica, fumed 0.040 0.040 0.040 0.040 silica) 1.970 1.970 1.970 p-toluylencdiaminc sulphate 1.970 2,4-Diaminophenoxyethanol 2HCI 0.160 0.160 0.160 0.160 Resorcinol 0.260 0.260 0.260 0.260 m-Aminophenol 0.660 0.660 0.660 0.660 Sodium sulphate 1.245 1.235 2.100 1.535 Sodium metasilicate anhydrous * - - - -Britesil C 265 * 1.600 1.600 4.100 1.600 Sodium carboxymethylcellulose (INCI: 1.800 1.800 1.700 1.900 Cellulose Gum; Cekol 50000) Xanthan 0.600 0.600 0.400 0.600 Succinic acid - 0.010 0.010 0.010 Paraffinum Liquidum 0.165 0.165 0.165 0.165 Municipal water 100 100 100 100 ready to use 116 116 122 128 dye (RUN pH value 9.5 9.5 9.3 9.5 Viscosity [Pa s] 74.6 71.2 73.1 70.2

(Brookfield LVDVII+, #5, 4 rpm, 20°C)

* Britesil C 265: Hydrous Sodium Silicate, Akzo PQ Silica, molar 5i02/Na20 ratio: 2.65 * Sodium metasilicate anhydrous fine: Silmaco powder FE, molar si02/Na20 ratio: 0.91-1.01 [90] The anhydrous oxidation composition (OC) and the anhydrous dyeing composition (DC) remained packaged separately, for example in a sachet package, until the ready-to-use dye was prepared.

[91] Immediately before application to the hair, the anhydrous oxidation composition (OC) and the anhydrous colouring composition (DC) were mixed together with the amount of water (city water, tap water) indicated in the above table and blended to form a homogeneous mass, the ready-to-use colorant.

[92] Immediately following the preparation of the ready-to-use dye, it was applied to human hair.

[93] After an exposure time of 30 minutes, the dye was thoroughly washed out of the hair with water.

[94] Optionally, the hair was then cleaned with a surfactant-containing shampoo and conditioner with a conditioner. After rinsing out the conditioner, the hair was dried first with a towel and then with a hair dryer at about 85°C. The hair was given a black, blue colour.

Examples: (all quantities in % by weight)

Example 5 Example 6

Dyeing composition (DC) 10.000 10.000 basic magnesium carbonate (magnesium carbonate hydroxide) heavy pharm. 400 g/I 8.500 8.500 Sipernate 22 8.000 Aeroperl 300/30 (INCI: Silica, fumed silica) 0.300 0.300 Sodium sulphate 47.591 55.591 Sodium carboxymethylcellulose (INCI: Cellulose gum; Cekol 50000) 19.000 19.000 Xanthan 5.500 5.500 Succinic acid 0.300 0.300 p-toluylenediamine sulphate 5.441 5.441 4-chlororesorcinol 0.418 0.418 2-methylresorcinol 0.223 0.223 Resorcinol 1.809 1.809 m-Aminophenol 0.418 0.418 Paraffinum Liquidum 2.500 2.500 Total 100.000 100.000 maximum viscosity (20°C) [Pa -s] 17.1 14.9 average viscosity (20°C) [Pa -s] 14.1 12.7 [95] The dyeing compositions (DC) from Example 5 (according to the invention) and Example 6 (comparative example) were each mixed with water in a weight ratio (DC) to water of 10:100 to form a homogeneous cream. A Haake iQ viscometer was used to determine the viscosity of both creams (2400 seconds with cup CCB25 and coaxial cylinder CC25, shear rate: 4.0 s-1).

[96] The addition of precipitated silica results in a higher maximum viscosity and also a higher average viscosity.

Claims (14)

1. Patent Claims 1 Kit for the oxidative dyeing of keratinous fibres, in particular human hair, comprising (i) an anhydrous oxidising composition (0C) containing at least one solid water-activatable oxidising agent selected from sodium percarbonate and sodium perborate and no polysaccharides, (H) separately from (0C), an anhydrous cosmetic colouring composition (DC) comprising at least one oxidation dye precursor of the developer type and at least one oxidation dye precursor of the coupler type, furthermore at least one alkalizing agent selected from sodium silicates and sodium metasilicates, each having a molar 5i02/Na20 ratio of from 0.8 to 3.7, preferably from 1.0 to 3.6, particularly preferably from 2.5 to 3.5, furthermore at least one polysaccharide thickener selected from sodium carboxymethylcellulose and xanthan gum and mixtures thereof, wherein the kit does not comprise a component containing persulfates, characterized in that at least one of the compositions (DC) or (0C) contains precipitated silica.
2. 2. Process for the oxidative dyeing of keratinous fibres, in particular human hair, comprising the following steps: (i) Providing an anhydrous oxidizing composition (0C) comprising at least one solid wateractivatable oxidizing agent selected from sodium percarbonate and sodium perborate and no polysaccharides, and separately therefrom providing an anhydrous cosmetic colouring composition (DC), wherein the colouring composition comprises (DC): at least one oxidation dye precursor of the developer type and at least one oxidation dye precursor of the coupler type, furthermore at least one alkalizing agent selected from sodium silicates and sodium metasilicates, each having a molar Si02/Na20 ratio of from 0.8 to 3.7, preferably from 1.0 to 3.6, particularly preferably from 2.5 to 3.5, furthermore as a thickener, at least one polysaccharide selected from sodium carboxymethylcellulose and xanthan and mixtures thereof, (H) Mixing of the composition (0C), the cosmetic colouring composition (DC) and water to form a ready-to-use colouring agent, (Hi) directly following step (ii), applying the ready-to-use colorant to keratinous fibres, in particular to human hair, (iv) Leaving the ready-to-use colorant on the keratinous fibres, in particular on human hair, for to 60 minutes, preferably for 15 to 45 minutes, particularly preferably for 30 minutes, (v) then rinsing the colorant from the keratinous fibres with water, optionally washing the fibres with a surfactant-containing detergent, conditioning the fibres with a conditioning agent, and/or drying the fibres.whereby no persulfates are used in the process, characterized in that the weight ratio of the sum of the weight of the compositions (0C) and (DC) to the weight of the amount of water used in step (ii), ROCHDC)]/[water], is in the range of 20 10:100 to 28:100, preferably 11:100 to 24:100, more preferably 12:100 to 22: 100, more preferably 13:100 to 20:100, further particularly preferred 14:100 to 19.6: 100, exceptionally preferably 16:100 to 18.1:100, further characterized in that at least one of the compositions (DC) or (OC) contains precipitated silica as a thickening agent.
3. 3 The dyeing kit according to claim 1 or the dyeing process according to claim 2, characterized in that the composition (DC) comprises, in each case based on its weight, 5 -25% by weight, preferably 10-22% by weight, particularly preferably 12-19% by weight. %, exceptionally preferably 13 -18 wt.% sodium carboxymethyl cellulose and/or 2-10 wt.%, preferably 3 -8 wt.%, particularly preferably 4 -7 wt.%, exceptionally preferably 5.5 -6 wt.% xanthan gum.
4. 4 The dyeing kit according to claims 1 or 3 or the dyeing process according to claims 2 or 3, characterized in that a mixture of sodium carboxymethylcellulose and xanthan is included as a thickening agent, wherein the weight ratio of sodium carboxymethylcellulose to xanthan is in the range of from 2.5:1 to 5:1, preferably from 3:1 to 4.3:1.
5. The dyeing kit according to claims 1,3 or 4 or the dyeing process according to any one of claims 2 to 4, characterized in that the anhydrous cosmetic dyeing composition (DC) further contains basic magnesium carbonate (magnesium carbonate hydroxide).
6. 6. The dyeing kit according to any one of claims 1 or 3 -5 or the dyeing process according to any one of claims 2 -5, characterized in that no ammonium salt is contained.
7. 7 The dyeing kit according to any one of claims 1 or 3 -6 or the dyeing process according to any one of claims 2 to 6, characterized in that no polymer or copolymer with acrylate-, methacrylate-or vinyl-containing monomers and no polyurethane is contained.
8. 8. The dyeing kit according to any one of claims 1 or 3 -7 or the dyeing process according to any one of claims 2 -7, characterized in that at least one solid water-activatable oxidizing agent selected from sodium percarbonate and sodium perborate is present in the composition (OC) in a total amount of 20-100% by weight, preferably 40-90% by weight, preferably 45 -80% by weight, in particular 55 -70% by weight, based on the weight of the composition (OC).
9. 9. The dyeing kit according to any one of claims 1 or 3 -8 or the dyeing process according to any one of claims 2 -8, characterized in that the anhydrous cosmetic dyeing composition (DC) and the anhydrous composition (OC) are present in a weight ratio to each other of [DC]/[OC] ranging from 1:1 to 6:1, preferably from 1.1:1 to 4:1, more preferably from 1.5:1 to 3: 1.
10. 10. The dyeing kit according to any one of claims 1 or 3 -9 of the dyeing process according to any one of claims 2 -9, characterized in that the anhydrous dyeing composition (DC) comprises precipitated silica as a thickening agent in a concentration of 0.2 -50.0 wt.%, preferably 1.0 -35 wt.%, more preferably 5-10 wt.%, each based on the weight of the dyeing composition (DC).
11. 11 The dyeing kit according to any one of claims 1 or 3-10 or the dyeing process according to any one of claims 2-10, characterized in that the anhydrous oxidation composition (OC) comprises precipitated silica as a thickening agent in a concentration of 0.2-80.0% by weight, preferably 1.060% by weight, more preferably 5-25% by weight, exceptionally preferably 8-15% by weight, each based on the weight of the oxidation composition (OC).
12. 12. The dyeing process according to any one of claims 2 to 11, characterized in that the ready-to-use dyeing composition contains 1.0-7.0% by weight, preferably 1.5-6.0% by weight, preferably 2.5 -5.2% by weight, in particular 2.7 -4.7% by weight, exceptionally preferably 3.0-3.6% by weight of sodium percarbonate, in each case based on the weight of the ready-to-use dyeing composition.
13. 13 The dyeing process according to any one of claims 2 to 12, characterized in that the ready-to-use colorant contains 1.0-7.0% by weight, preferably 1.5-6.0% by weight, preferably 2.5-5.2% by weight, in particular 2.7-4.7% by weight, exceptionally preferably 3.0-3.6% by weight of sodium perborate, in each case based on the weight of the ready-to-use colorant.
14. 14. Use of precipitated silica in a dyeing kit according to any one of claims 1 or 3-11 or in a dyeing process according to any one of claims 2 to 13 as a thickening agent.