Two-component oxidation powder hair color with a combination of thickeners

Abstract

The present invention lies in the field of cosmetic hair coloring and relates to a kit for oxidative coloring of keratin fibers, in particular human hair, comprising an anhydrous oxidation composition (OZ) containing sodium percarbonate or sodium perborate and, separately from the oxidation composition (OZ), an anhydrous cosmetic coloring composition (FZ) 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 thickener, and further precipitated silica as an additional thickener, wherein an oxidative hair coloring agent can be prepared by mixing the components of the kit with water without the need to additionally add hydrogen peroxide.

Description

Title of the invention: Two-component oxidation powder hair color comprising a combination of thickeners

[0001] The present invention lies in the field of cosmetic hair coloring and relates to a kit for the oxidation coloring of keratin fibers, in particular human hair, comprising an anhydrous oxidation composition (OZ) containing sodium percarbonate or sodium perborate and, separately from the oxidation composition (OZ), an anhydrous cosmetic coloring composition (FZ) 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 thickener, and further precipitated silica as an additional thickener, wherein an oxidation hair coloring agent can be prepared by mixing the components of the kit with water without the need to additionally add hydrogen peroxide..

[0002] Another object of the present invention is a process for coloring by oxidation of keratin fibers, in particular human hair, using the aforementioned anhydrous kit components and water.

[0003] Changing the color of keratin fibers, especially hair, is an important area of ​​modern cosmetics. Thus, the appearance of the hair can be adapted both to current fashion trends and to the specific wishes of each person. When it comes to changing hair color, various possibilities are available to the specialist in the field.

[0004] Through the use of direct dyes, hair color can be temporarily changed. In this case, ready-to-use dyes diffuse from the coloring agent into the hair fiber. Coloring with direct dyes causes little damage to the hair, but has a disadvantage, namely the low durability and rapid washing out of the colors obtained with direct dyes.

[0005] If the consumer desires a long-lasting color result or a shade lighter than their natural hair color, oxidative color modifying agents will generally be used. Oxidative coloring agents are used to achieve intense, permanent colorations with good color authenticity properties. These coloring agents usually contain oxidation dye precursors, called "developing constituents" and "coupling constituents" which, under the action of the oxidizing agents - generally hydrogen peroxide - interact to form the dyes themselves. same. Oxidative coloring agents are characterized by both excellent and long-lasting coloring results.

[0006] Oxidative color modifying agents are generally marketed as two-component agents, in which two different preparations are packaged separately in two separate packages and are only mixed just before application. The first component of common coloring agent kits is an aqueous composition - acidic for stability reasons - containing dissolved hydrogen peroxide as the oxidizing agent in concentrations ranging from 1.5 to 24% by weight. These aqueous oxidizing agent compositions are frequently in the form of an emulsion or dispersion and are generally provided in a plastic bottle with a resealable neck (developer bottle).

[0007] This oxidizing agent formulation of known coloring kits is mixed with a second preparation before application. This second preparation is an alkaline formulation which is often in the form of a cream or gel and which also contains at least one oxidation dye precursor if a color change is desired at the same time as lightening. This second preparation is often packaged in a tube or in a plastic or glass container.

[0008] In the common form of application described above, the second preparation, which contains the alkalizing agent and, if desired, the oxidation dye precursors, is transferred from the tube or container into the developer bottle and then mixed by stirring with the hydrogen peroxide preparation already present in the developer bottle. In this way, the mixture to be applied is prepared in the developer bottle. Application to the hair is then carried out via a small spout or neck provided at the top of the developer bottle. After stirring, the spout or neck is opened and the mixture to be applied can be extracted by squeezing the flexible developer bottle.

[0009] When preparing the mixture to be applied in a bowl, the two components - the first preparation containing the oxidizing agent and the second preparation containing an alkalizing agent and, if desired, oxidation dye precursors - are transferred entirely into a bowl or similar container and then stirred using a brush, for example. The mixture to be applied is then extracted from the mixing bowl using the brush. In this form of application, the use of a bulky and expensive developer bottle is not necessary.

[0010] However, filling hydrogen peroxide solutions into such packages is associated with problems due to the reactivity of hydrogen peroxide, which may gradually decompose to form oxygen (i.e. gas) depending on the storage conditions and possibly the presence of impurities having a decomposition action

[0011] As a rule, the developer bottles known from the prior art are filled with the oxidizing agent composition to a maximum of only half, usually only one third of their internal volume. As a rule, the developer bottles are made of polyethylene. Since polyethylene is permeable to both water vapor and gases, there is no or very little excess pressure in the developer bottle. In addition, the developer bottles are usually provided with thick, robust walls and a solid screw closure, so that the diffusion of water vapor or gas through the wall thickness is reduced and a very slight increase in pressure inside the bottle has no negative effect.

[0012] As a result, the packaging is usually bulky, which is detrimental to sustainability and the preservation of the environment and resources. The use of a solid as an oxidizing agent is advantageous, since the solid can be activated by the addition of water alone without the need to also add hydrogen peroxide. Sodium percarbonate and sodium perborate are known as solid oxidizing agents for coloring 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 has a disadvantage for adjusting the viscosity of the ready-to-use hair coloring agent. This is because polyelectrolytes such as xanthan gum, which lose their viscosity-increasing effect as the salt(s) content increases, are often used as thickeners.If the ready-to-use hair coloring agent has too low a viscosity, it is more difficult to apply and can flow more easily from the hair during the processing time, which is not desirable.

[0013] The objective of the present application is to provide a hair coloring agent comprising a solid oxidizing agent, activatable with water, the hair coloring agent having no disadvantages in terms of handling, in particular in terms of the viscosity of the ready-to-use hair coloring agent. Furthermore, the hair coloring formulations must be packaged in a safe and space-saving manner in order to ensure high storage stability and to provide a coloring agent that is as resource-efficient as possible. In addition, the use of the coloring agent must be as safe as possible for the consumer.

[0014] The objective of the invention is achieved by a kit for coloring by oxidation of keratin fibers, in particular human hair, comprising

[0015] (i) an anhydrous oxidation composition (OZ), containing at least one oxidizing agent solid, activatable with water, chosen from sodium percarbonate and sodium perborate, and containing no polysaccharide,

[0016] (ii) separately from (OZ), an anhydrous cosmetic coloring composition (FZ), container

[0017] - at least one developer-type oxidation dye precursor and at least one coupler-type oxidation dye precursor, as well as

[0018] - at least one alkalizing agent chosen from sodium silicates and meta- sodium silicates, each having a SiO2 / Na2O molar ratio of 0.8 to 3.7, preferably of 1.0 to 3.6, particularly preferably of 2.5 to 3.5, as well as

[0019] - at least one polysaccharide as thickener, chosen from carboxymethyl- sodium cellulose and xanthan gum and mixtures thereof,

[0020] the kit not comprising any constituent having a persulfate content,

[0021] characterized in that at least one of the compositions (FZ) or (OZ) contains precipitated silica.

[0022] Another object of the present invention is a process for coloring by oxidation of keratin fibers, in particular human hair, comprising the following steps:

[0023] (i) providing an anhydrous oxidation composition (OZ), containing at least one solid oxidizing agent, activatable with water, selected from sodium percarbonate and sodium perborate, and containing no polysaccharide, and separately therefrom, providing an anhydrous cosmetic coloring composition (FZ), the coloring composition (FZ) containing:

[0024] - at least one developer-type oxidation dye precursor and at least one coupler-type oxidation dye precursor, as well as

[0025] - at least one alkalizing agent chosen from sodium silicates and meta- sodium silicates, each having a SiO2 / Na2O molar ratio of 0.8 to 3.7, preferably of 1.0 to 3.6, particularly preferably of 2.5 to 3.5, as well as

[0026] - at least one polysaccharide as thickener, chosen from carboxymethyl- sodium cellulose and xanthan gum and mixtures thereof,

[0027] (ii) mixing the composition (OZ), the cosmetic coloring composition (FZ) and water to form a ready-to-use coloring agent,

[0028] (iii) directly after step (ii), application of the ready-to-use coloring agent to the keratin fibers, in particular to human hair,

[0029] (iv) applying the ready-to-use coloring agent to the keratin fibers, in particular to human hair, for 5 to 60 minutes, preferably for 15 to 45 minutes, particularly preferably for 30 minutes,

[0030] (v) then rinsing with water the keratin fiber coloring agent, even actually washing the fibers with a cleaning agent containing a surfactant, conditioning the fibers with a conditioning agent and / or drying the fibers,

[0031] no persulfate being used in the process,

[0032] characterized in that the weight ratio between the sum of the weights of the compositions (OZ) and (FZ) and the weight of the amount of water used in step (ii), [(OZ)+(FZ)] / [water], is in the range of 10:100 to 28:100, preferably 11:100 to 24:100, particularly preferably 12:100 to 22:100, very particularly preferably 13:100 to 20:100, even more preferably 14:100 to 19.6:100, exceptionally preferably 16:100 to 18.1:100,

[0033] further characterized in that at least one of the compositions (FZ) or (OZ) contains precipitated silica as a thickener.

[0034] By "keratin fibers", "keratin-based fibers" or "keratin fibers" is meant furs, wool, feathers and in particular human hair. Although the agents according to the invention are primarily suitable for lightening and coloring keratin fibers, nothing in principle prevents their use in other contexts.

[0035] The kit according to the invention is a kit for the modification of color by oxidation of keratin fibers, that is to say a product which is applied to the human head after mixing with water in order to achieve coloring by oxidation or tinting of the hair. In this context, we speak of "tinting" when the result is a color lighter than the original color of the hair. Throughout the present application, the term "cosmetic coloring composition (FZ)" is used as a synonym for the term "preparation (FZ)" or "coloring composition (FZ)".

[0036] The kit according to the invention comprises, as first component, an anhydrous oxidation composition (OZ), containing at least one solid oxidizing agent, activatable with water, chosen from sodium percarbonate and sodium perborate, and containing no polysaccharide.

[0037] The compositions (OZ) and (FZ) designated as "anhydrous" of the coloring kits according to the invention and preferred according to the invention 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 relative to the weight of the compositions (OZ) or (FZ). With the water contents mentioned in the range of 0 to 8% by weight, the compositions (OZ) and (FZ) are by definition considered anhydrous within the meaning of the present application. These indications relate to the free water content. This does not take into account the content of water bound at the molecular level or water of crystallization, potentially associated with individual powder constituents.The water content can be measured with a moisture analyzer or a moisture meter, for example a moisture meter from Mettler, model Mettler HS 153, the loss on drying being determined at 105 °C, stop criterion 50 seconds with a product weight of 1 to 1.5 grams.

[0038] In one embodiment of the invention, the anhydrous oxidation composition (OZ) of the coloring kit according to the invention and preferred according to the invention contains the agent solid oxidant sodium percarbonate. Sodium percarbonate is understood to mean an addition product of H2O2 with the formula 2 Na2CO3-3 H2O2. When mixed with the coloring composition containing the alkalizing agent (FZ) and water, the ready-to-use coloring agent is obtained, in which the sodium percarbonate develops its effect as an oxidizing agent.

[0039] The preferred coloring kits according to the invention and the preferred coloring methods according to the invention are characterized in that the sodium percarbonate is contained in the oxidation composition (OZ) in a total amount of 20 to 100% by weight, preferably 40 to 90% by weight, preferably 45 to 80% by weight, in particular 55% to 70% by weight, relative to the weight of the oxidation composition (OZ).

[0040] It may be preferred in an exceptional manner according to the invention that the sodium percarbonate is contained in the oxidation composition (OZ) in a total amount of 100% by weight, relative to the weight of the oxidation composition (OZ).

[0041] In another preferred embodiment of the coloring kit according to the invention and of the coloring method according to the invention, the sodium percarbonate is present in coated form, preferably coated with at least one salt chosen from sodium carbonate, sodium hydrogen carbonate or sodium chloride and mixtures of these salts.

[0042] Another preferred embodiment of the coloring process according to the invention is characterized in that the ready-to-use coloring agent contains 1.0 to 7.0% by weight, preferably 1.5 to 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 relative to the weight of the ready-to-use coloring agent.

[0043] In another embodiment of the invention, the anhydrous oxidation composition (OZ) of the coloring kit according to the invention and preferred according to the invention contains the solid oxidizing agent sodium perborate. When mixed with the coloring composition containing the alkalizing agent (FZ) and water, the ready-to-use coloring agent is obtained, in which the sodium perborate develops its effect as an oxidizing agent.

[0044] The preferred coloring kits according to the invention and the preferred coloring methods according to the invention are characterized in that the sodium perborate is contained in the oxidation composition (OZ) in a total amount of 20 to 100% by weight, preferably 40 to 90% by weight, preferably 45 to 80% by weight, in particular 55% to 70% by weight, relative to the weight of the oxidation composition (OZ).

[0045] It may be preferred in an exceptional manner according to the invention that the perborate of sodium is contained in the oxidation composition (OZ) in a total amount of 100% by weight, relative to the weight of the oxidation composition (OZ).

[0046] Another preferred embodiment of the coloring process according to the invention is characterized in that the ready-to-use coloring agent contains 1.0 to 7.0% by weight, preferably 1.5 to 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 relative to the weight of the ready-to-use coloring agent.

[0047] The use of at least one solid oxidizing agent, activatable with water, chosen from sodium percarbonate and sodium perborate, makes it possible to eliminate the addition of a hydrogen peroxide solution. The coloring kits according to the invention are therefore more stable during storage and safer compared to coloring kits comprising a hydrogen peroxide solution. Persulfates, such as sodium persulfate, ammonium persulfate and potassium persulfate, cannot be activated solely with water, but require the addition of a solution containing hydrogen peroxide. The coloring kits and coloring methods according to the invention are therefore free of persulfate.

[0048] The physical state "solid" refers to standard conditions, namely 20 °C and 10 5Pa. Unless otherwise indicated, all indications relating to the physical state refer to these standard conditions.

[0049] The oxidation composition according to the invention (OZ) is further characterized in that it does not contain any polysaccharide. It has surprisingly been found that the joint storage of an oxidizing agent, chosen from sodium percarbonate and sodium perborate, with polysaccharides results in disadvantages for both ingredients in terms of long-term stability.

[0050] One embodiment of the invention is characterized in that the oxidation composition according to the invention (OZ) contains precipitated silica as a thickener. The precipitated silica used according to the invention is in powder form. The preferred precipitated silica according to the invention has a tapped density in the range of 100 to 400 g / l, preferably in the range of 200 to 300 g / l, particularly preferably in the range of 230 to 260 g / L, preferably measured according to DIN ISO 787-11 of October 1995. The preferred precipitated silica according to the invention is further characterized in that its 5% by weight suspension reacts weakly acidically in water, i.e. it has a pH in the range of 6.0 to 6.9, preferably in the range of 6.3 to 6.7, extremely preferably 6.5, preferably measured according to DIN ISO 787-9 of September 2019.

[0051] The use of precipitated silica as a thickener produces a stable viscosity, independent of the salt content of the ready-to-use coloring agent obtained by mixing the oxidation composition (OZ) with the coloring composition (FZ) and water. This improves the application properties of the final product, as it allows the ready-to-use coloring agent to remain on the hair for the duration of the application time without running. 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.

[0052] The preferred coloring kits and coloring methods according to the invention are characterized in that the anhydrous oxidation composition (OZ) contains precipitated silica as a thickener at a concentration of 0.2 to 80.0% by weight, preferably 1.0 to 60% by weight, particularly preferably 5 to 25% by weight, exceptionally preferably 8 to 15% by weight, in each case relative to the weight of the oxidation composition (OZ).

[0053] A variant of the embodiment of the invention is characterized in that the coloring composition according to the invention (FZ) contains precipitated silica as a thickener. The precipitated silica to be used in (FZ) has the same characteristics as those described above in relation to (OZ).

[0054] The preferred coloring kits and coloring methods according to the invention are characterized in that the anhydrous coloring composition (FZ) contains precipitated silica as a thickener at a concentration of 0.2 to 50.0% by weight, preferably 1.0 to 35% by weight, particularly preferably 5 to 10% by weight, in each case relative to the weight of the coloring composition (FZ).

[0055] Further preferred coloring kits and coloring methods according to the invention are characterized in that the anhydrous coloring composition (FZ) contains precipitated silica as a thickener in a concentration of 0.2 to 50.0% by weight, preferably 1.0 to 35% by weight, particularly preferably 5 to 10% by weight, in each case based on the weight of the coloring composition (FZ), and the anhydrous oxidation composition (OZ) contains precipitated silica as a thickener in a concentration of 0.2 to 80.0% by weight, preferably 1.0 to 60% by weight, particularly preferably 5 to 25% by weight, exceptionally preferably 8 to 15% by weight, in each case based on the weight of the oxidation composition (OZ).

[0056] In another preferred embodiment of the coloring kit according to the invention and of the coloring method according to the invention, the oxidation composition (OZ) contains at least one adjuvant chosen from fillers, anti-caking agents and drying agents as well as mixtures of these adjuvants. These adjuvants are intended to prevent clumping or sticking of the powder components of the anhydrous compositions (OZ) and (FZ).

[0057] Particularly preferred fillers are chosen from sodium sulfate and sodium chloride and mixtures thereof. Sodium chloride is particularly preferred because it can enhance the oxidizing effect of sodium percarbonate. This is particularly desirable for achieving light shades.

[0058] Particularly preferred anti-caking agents are chosen from pyrogenic silicic acids, diatomaceous earth, calcium phosphate, calcium silicates, aluminum oxide, magnesium oxide, magnesium carbonate, zinc oxide, stearates and mixtures thereof.

[0059] Particularly preferred drying agents are chosen from sodium sulfate, sodium carbonate, magnesium sulfate, calcium chloride and pyrogenic silicic acids and mixtures thereof.

[0060] The preferred coloring kits according to the invention and the preferred coloring methods according to the invention are characterized in that the oxidation composition (OZ) contains at least one adjuvant chosen from fillers, anti-caking agents and drying agents as well as mixtures of these adjuvants, in a total amount of 0.5 to 80% by weight, preferably 5 to 65% by weight, preferably 10 to 55% by weight, in particular 20 to 35% by weight, relative to the weight of the oxidation composition (OZ).

[0061] The anhydrous coloring composition (FZ) of the coloring kit according to the invention and preferred according to the invention contains at least one developer-type oxidation dye precursor (developer constituent) and at least one coupler-type oxidation dye precursor (coupler constituent).

[0062] The preferred developer constituents according to the invention are chosen from the group consisting of 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-methylphenyl)-N-[3-(1H-imidazol-1-yl)propyl]amine, N,N'-bis-(2-hydroxyethyl)-N,N'-bis-(4-aminophenyl)-1,3-diamino-propan-2-ol, bis-(2-hydroxy-5-aminophenyl)methane, l,3-bis-(2,5-diaminophenoxy)propan-2-ol, N,N'-bis-(4-aminophenyl)-l,4-diazacycloheptane, l,10-bis-(2,5-diaminophenyl)-l,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-lH,5H-pyrazolo-[l,2-a]-pyrazol-l-one and their physiologically acceptable salts and their mixtures.

[0063] Preferred physiologically acceptable salts of dye precursors oxidation states which contain one or more amine groups, are in particular the hydrochlorides (monohydrochloride x HCl, or dihydrochloride x 2 HCl), the sulfate (x H2 SO4) and the hydrobromide (monohydrobromide x HBr or dihydrobromide x 2 HBr) of the compound.

[0064] The preferred coloring kits according to the invention and the preferred coloring methods according to the invention are characterized in that the coloring composition (FZ) contains at least one developer component chosen 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-methylphenyl)-N-[3-(1H-imidazol-1-yl)propyl]amine, N,N' -bis-(2-hydroxyethyl)-N,N' -bis-(4-aminophenyl)-1,3-diamino-propan-2-ol, bis-(2-hydroxy-5-aminophenyl)methane, l,3-bis-(2,5-diaminophenoxy)propan-2-ol, N,N' -bis-(4-aminophenyl)-1,4-diazacycloheptane, l,10-bis-(2,5-diaminophenyl)-l,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-lH,5H-pyrazolo-[l,2-a]-pyrazol-l-one and their physiologically acceptable salts acceptable and mixtures thereof, in a total amount of 0.1 to 40% by weight, preferably 1 to 30% by weight, particularly preferably 5 to 25% by weight, exceptionally preferably 10 to 20% by weight, in each case relative to the weight of the anhydrous coloring composition (FZ).

[0065] Preferred coupler type oxidation dye precursors according to the invention are selected from the group consisting of 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-hydroxyethyl)amino]-4-methoxy-5-methylphenyl}amino)ethanol, 2-({3-[(2-hydroxyethyl)amino]-2-methoxy-5-methylphenyl}amino)ethanol, 2-({3-[(2-hydroxyethyl)amino]-4,5-dimethylphenyl}amino)ethanol, 2-[3-morpholino-4-ylphenyl)amino]ethanol, 3-amino-4-(2-methoxyethoxy)-5-methylphenylamine, l-amino-3-bis-(2-hydroxyethyl)aminobenzene, resorcinol, 2-methylresorcinol, 4-chlororesorcinol, 1,2,4-trihydroxybenzene, 2-amino-3-hydroxypyridine, 3-amino-2-methylamino-6-methoxypyridine, 2,6-dihydroxy-3,4-dimethylpyridine, 3,5-diamino-2,6-dimethoxypyridine, l-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 acceptable salts.

[0066] The preferred coloring kits according to the invention and the preferred coloring methods according to the invention are characterized in that the coloring composition (FZ) contains at least one coupler component, selected from the group consisting of 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)-l-methylbenzene, 2-({3-[(2-hydroxyethyl)amino]-4-methoxy-5-methylphenyl]amino)ethanol, 2-({3-[(2-hydroxyethyl)amino]-2-methoxy-5-methylphenyl]amino)ethanol, 2-({3-[(2-hydroxyethyl)amino]-4,5-dimethylphenyl]amino)ethanol, 2-[3-morpholino-4-ylphenyl)amino]ethanol, 3-amino-4-(2-methoxyethoxy)-5-methylphenylamine, l-amino-3-bis-(2-hydroxyethyl)aminobenzene, resorcinol, 2-methylresorcinol, 4-chlororesorcinol, 1,2,4-trihydroxybenzene, 2-amino-3-hydroxypyridine, 3-amino-2-methylamino-6-methoxypyridine, 2,6-dihydroxy-3,4-dimethylpyridine, 3,5-diamino-2,6-dimethoxypyridine, l-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 acceptable salts, in a total amount of 0.1 to 40% by weight, preferably 1 to 20% by weight, particularly preferably 5 to 15% by weight, exceptionally preferably 6 to 10% by weight, in each case by relative to the weight of the anhydrous coloring composition (FZ).

[0067] Preferred coloring kits according to the invention and preferred coloring methods according to the invention are characterized in that the coloring composition (FZ) contains one or more direct-acting dyes. Preferred nonionic direct-acting dyes are selected from the group consisting of HC Yellow 2, HC Yellow 4, HC Yellow 5, 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 and Disperse Black 9, as well as l,4-diamino-2-nitrobenzol, 2-amino-4-nitrophenol, l,4-bis-(2-hydroxyethyl)-amino-2-nitrobenzol, 3-nitro-4-(2-hydroxyethyl)aminophenol, 2-(2-hydroxyethyl)amino-4,6-dinitrophenol, 4-[(2-hydroxyethyl)amino]-3-nitro-l-methylbenzol, l-amino-4-(2-hydroxyethyl)amino-5-chloro-2-nitrobenzol,4-amino-3-nitrophenol, l-(2'-ureidoethyl)amino-4-nitrobenzol, 2-[(4-amino-2-nitrophenyl)amino]-benzoic acid, 4-[(3-hydroxypropyl)amino]-3-nitrophenol, 4-nitro-o-phenylenediamine, 6-nitro-l,2,3,4-tetrahydroquinoxaline, 2-hydroxy-l,4-naphthoquinone, picramic acid and its salts, 2-amino-6-chloro-4-nitrophenol, 4-ethylamino-3-nitrobenzoic acid and 2-chloro-6-ethylamino-4-nitrophenol.

[0068] Preferred anionic direct acting 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.

[0069] Suitable cationic direct-acting dyes are triphenylmethane-based cationic dyes, such as, for example, Basic Blue 7, Basic Blue 26, Basic Violet 2 and Basic Violet 14; quaternary nitrogen-substituted aromatic systems, for example, Basic Yellow 57, Basic Red 76, Basic Blue 99, Basic Brown 16 and Basic Brown 17; anthraquinone-based cationic dyes such as HC Blue 16 (Bluequat B); and heterocycle-containing direct dyes having at least one quaternary nitrogen atom, in particular Basic Yellow 87, Basic Orange 31 and Basic Red 51. Cationic direct-acting dyes marketed under the trademark Arianor are also suitable cationic direct dyes according to the invention.

[0070] The coloring composition according to the invention (FZ) is further characterized in that it contains at least one alkalizing agent chosen from sodium silicates and sodium metasilicates, each having a SiO2 / Na2O molar ratio of 0.8 to 3.7, preferably 1.0 to 3.6, particularly preferably 2.5 to 3.5. The solid alkalizing agents can be suitably incorporated into the anhydrous coloring composition (FZ). Upon dissolution of the coloring composition (FZ) in water, these alkalizing agents produce the alkaline pH necessary for the activation of the sodium percarbonate.

[0071] The preferred coloring kits according to the invention and the preferred coloring methods according to the invention are characterized in that the coloring composition (FZ) contains at least one alkalizing agent selected from sodium silicates and sodium metasilicates, each having a SiO2 / Na2O molar ratio of 0.8 to 3.7, preferably 1.0 to 3.6, particularly preferably 2.5 to 3.5, in a total amount of 5 to 50% by weight, preferably 8 to 40% by weight, particularly preferably 10 to 35% by weight, exceptionally preferably 15 to 25% by weight, in each case relative to the weight of the anhydrous coloring composition (FZ).

[0072] Another preferred embodiment of the coloring process according to the invention is characterized in that the ready-to-use coloring agent contains at least one alkalizing agent selected from sodium silicates and sodium metasilicates, each having a SiO2 / Na2O molar ratio of 0.8 to 3.7, preferably 1.0 to 3.6, particularly preferably 2.5 to 3.5, in a total amount of 0.8 to 5.0% by weight, preferably 1.0 to 4.0% by weight, particularly preferably 1.2 to 3.5% by weight, in each case relative to the weight of the ready-to-use coloring agent.

[0073] Further preferred coloring kits according to the invention and preferred coloring methods according to the invention are characterized in that the coloring composition (FZ) contains basic magnesium carbonate (magnesium carbonate hydroxide) as secondary alkalizing agent. Basic magnesium carbonate (magnesium carbonate hydroxide) has several advantages within the scope of the invention: it has a weaker alkaline effect than sodium silicates and metasilicates, which each have a SiO2 / Na2O molar ratio of 0.8 to 3.7, preferably 1.0 to 3.6, particularly preferably 2.5 to 3.5, and thus buffers the alkalinity of the ready-to-use coloring agent. Adjusting the pH value preferred according to the invention of the ready-to-use coloring agent with only one of the aforementioned sodium (meta)silicates can produce undesirable foaming when preparing the application mixture.This phenomenon is limited by the addition of basic magnesium carbonate (magnesium carbonate hydroxide). In addition, basic magnesium carbonate (magnesium carbonate hydroxide) has very good adsorption properties. These can be used to extract dust from . the anhydrous coloring composition (FZ) with an oil. The adsorption of an oil added for dust extraction binds the fine powder particles of the individual components of the coloring composition (FZ), so that a low-dust or dust-free powder is obtained. In addition, the ready-to-use coloring agent forms a fine creamy mass in the presence of basic magnesium carbonate (magnesium carbonate hydroxide).

[0074] The preferred coloring kits according to the invention and the preferred coloring methods according to the invention are characterized in that the coloring composition (FZ) contains 5 to 16% by weight, preferably 6 to 14% by weight, particularly preferably 8 to 11% by weight of basic magnesium carbonate (magnesium carbonate hydroxide), in each case relative to the weight of the anhydrous coloring composition (FZ).

[0075] Another preferred embodiment of the coloring process according to the invention is characterized in that the ready-to-use coloring agent contains 0.5 to 2.0% by weight, preferably 0.6 to 1.2% by weight, particularly preferably 0.7 to 1.0% by weight, of basic magnesium carbonate (magnesium carbonate hydroxide), in each case relative to the weight of the ready-to-use coloring agent.

[0076] The anhydrous coloring composition (FZ) of the coloring kit according to the invention and preferred according to the invention further contains at least one polysaccharide as thickener, chosen from sodium carboxymethylcellulose and xanthan gum and their mixtures.

[0077] The preferred coloring kits according to the invention and the preferred coloring methods according to the invention are characterized in that the anhydrous cosmetic coloring composition (FZ) and the anhydrous composition (OZ) containing sodium percarbonate are present in a weight ratio of [FZ] / [OZ] in the range of 1:1 to 6:1, preferably 1.1:1 to 4:1, particularly preferably 1.5:1 to 3:1.

[0078] The combination of the thickener and the alkalizing agent used according to the invention leads to easier handling of the ready-to-use coloring agent which can be prepared from the kit according to the invention and water.

[0079] When mixing the anhydrous components of the kit according to the invention (OZ) and (FZ) with water, the mixture remains of low viscosity during the first few seconds of mixing, so that mixing can be carried out easily and quickly. The viscosity then increases and the ready-to-use coloring agent can be easily applied to the keratin fibers due to the higher viscosity. After the usual time required for mixing and application, maximum viscosity is reached. The already applied mixture does not run off the hair. As the combination of thickener and alkalizing agent used according to the invention develops progress- sively the viscosity of the ready-to-use agent, the ready-to-use coloring agent which can be prepared from the kit according to the invention is easier to handle.

[0080] According to the invention, "xanthans" means natural polysaccharides obtainable from sugar substrates using bacteria of the genus Xanthomonas. Preferably, the xanthan d-glucose, d-mannose, d-glucuronic acid, acetate and pyruvate used according to the invention contains a molar ratio of 28:30:20:17:5.1-6.3, the main chain consisting of glucose units linked to the [3-1,4 (also called cellulose chain). The xanthans used particularly preferably in the context of the present invention have the CAS number 11138-66-2 and the following structural formula

[0081] [Chem.l]

[0082] Xanthan gum is a polyelectrolyte due to the presence of carboxylate groups.

[0083] In the context of the present invention, the use of xanthans, at least 95% by weight of which have a particle diameter of less than 0.180 mm in powder form and the 1% by weight solution of which in a 1% by weight aqueous solution of KCl (potassium chloride) has a viscosity of 1400 to 1600 mPa s (measured with Brookfield LVTD, spindle 3, 60 rpm, 25 °C), has proven to be particularly advantageous. Such xanthans are commercially available, for example, under the trade name Keltrol CG-SFT from the company CP Kelco.

[0084] The thickener sodium carboxymethylcellulose (INCI: Cellulose Gum) is commercially available, for example, under the trade name “Cekol 50000”.

[0085] The preferred coloring kits according to the invention and the preferred coloring methods according to the invention are characterized in that the coloring composition (FZ) contains, in each case relative to its weight, 5 to 25% by weight, preferably 10 to 22% by weight, particularly preferably 12 to 19% by weight, exceptionally preferably 13 to 18% by weight of sodium carboxymethylcellulose.

[0086] Other preferred coloring kits according to the invention and preferred coloring methods according to the invention are characterized in that the coloring composition (FZ) contains, in each case relative to its weight, 2 to 10% by weight, preferably 3 to 8% by weight, particularly preferably 4 to 7% by weight, exceptionally preferably 5.5 to 6% by weight of xanthan gum.

[0087] Further preferred coloring kits according to the invention and preferred coloring methods according to the invention are characterized in that the coloring composition (FZ) contains, in each case relative to its weight, 5 to 25% by weight, preferably 10 to 22% by weight, particularly preferably 12 to 19% by weight, exceptionally preferably 13 to 18% by weight of sodium carboxymethylcellulose and 2 to 10% by weight, preferably 3 to 8% by weight, particularly preferably 4 to 7% by weight, exceptionally preferably 5.5 to 6% by weight of xanthan gum.

[0088] Other preferred coloring kits according to the invention and other preferred coloring methods according to the invention are characterized in that the coloring composition (FZ) contains as thickener a mixture of sodium carboxymethylcellulose and xanthan gum, the weight ratio between sodium carboxymethylcellulose and xanthan gum being in the range of 2.5:1 to 5:1, preferably 3:1 to 4.3:1.

[0089] Another preferred embodiment of the coloring process according to the invention is characterized in that the ready-to-use coloring agent contains 0.4 to 3.0% by weight, preferably 0.8 to 2.6% by weight, particularly preferably 1.2 to 2.2% by weight, of sodium carboxymethylcellulose, in each case relative to the weight of the ready-to-use coloring agent.

[0090] Another preferred embodiment of the coloring process according to the invention is characterized in that the ready-to-use coloring agent contains 0.1 to 1.2% by weight, preferably 0.3 to 1.0% by weight, particularly preferably 0.4 to 0.6% by weight, of xanthan gum, in each case relative to the weight of the ready-to-use coloring agent.

[0091] Another preferred embodiment of the coloring process according to the invention is characterized in that the ready-to-use coloring agent contains 0.4 to 3.0% by weight, preferably 0.8 to 2.6% by weight, particularly preferably 1.2 to 2.2% by weight of sodium carboxymethylcellulose and 0.1 to 1.2% by weight, preferably 0.3 to 1.0% by weight, particularly preferably 0.4 to 0.6% by weight, of xanthan gum, in each case relative to the weight of the ready-to-use coloring agent.

[0092] Other preferred staining kits according to the invention and preferred staining methods according to the invention are characterized in that no ammonium salt is present.

[0093] Other preferred coloring kits according to the invention and coloring methods Preferred according to the invention are characterized in that no polymer or copolymer with monomers containing acrylate, methacrylate or vinyl and no polyurethane is present.

[0094] The preferred anhydrous oxidation compositions (OZ) according to the invention and the preferred anhydrous coloring compositions (FZ) according to the invention each have a bulk density in the range from 450 to 1000 g / l (grams per liter), preferably from 500 to 950 g / l, and particularly preferably from 550 to 900 g / l. The determination of the bulk density is preferably carried out according to EN ISO 60, January 2000 version.

[0095] Unless otherwise stated, all temperature indications are given on the basis of a pressure of 1013 mbar.

[0096] Another preferred embodiment of the coloring method according to the invention is characterized in that the ready-to-use coloring agent has a viscosity in the range of 10 to 100 Pa s, preferably 20 to 85 Pa s, particularly preferably 40 to 80 Pa s, exceptionally preferably 60 to 75 Pa s, in each case measured at 20 °C with a Brookfield rotational viscometer, model LVDVII+, spindle 5, 4 revolutions per minute (rpm).

[0097] The coloring process according to the invention is characterized in that the weight ratio between the sum of the weights of the compositions (OZ) and (FZ) and the weight of the quantity of water used to prepare the ready-to-use coloring agent according to the invention, [(OZ)+(FZ)] / [water], is in the range from 10:100 to 28:100, preferably from 11:100 to 24:100, particularly preferably from 12:100 to 22:100, very particularly preferably from 13:100 to 20:100, even more preferably from 14:100 to 19.6:100, exceptionally preferably from 16:100 to 18.1:100.

[0098] Further preferred coloring kits according to the invention and preferred coloring methods according to the invention are characterized in that the anhydrous oxidation composition (OZ) and / or the anhydrous coloring composition (FZ) further contain a dusting agent which prevents the formation of dust in the powder components. In particular, oils may be used as dusting agents, in particular oils selected from paraffin oil, silicone oil or ester oil as well as mixtures of these oils, paraffin oil being particularly preferred.

[0099] Further preferred coloring kits according to the invention and preferred coloring methods according to the invention are characterized in that the coloring composition (FZ) contains, in each case relative to its weight, at least one oil in a total amount of 0.1 to 10.0% by weight, preferably 1.0 to 6.0% by weight, particularly preferably 2.0 to 3.0% by weight.

[0100] Further preferred coloring kits according to the invention and preferred coloring methods according to the invention are characterized in that the coloring composition (FZ) contains, in each case relative to its weight, a paraffin oil in a total amount of 0.1 to 10.0% by weight, preferably 1.0 to 6.0% by weight, particularly preferably 2.0 to 3.0% by weight.

[0101] Other preferred coloring kits according to the invention and preferred coloring methods according to the invention are characterized in that the anhydrous coloring composition (FZ) contains one or more acids which are present in solid form under standard conditions. Such an acid, in combination with the alkalizing agent, allows better buffering of the pH of the ready-to-use coloring agent. It is therefore preferred in the context of the present invention that the anhydrous coloring composition (FZ) further 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.

[0102] Oxidative dyeing processes on keratin fibers generally take place in an alkaline medium. However, in order to preserve the keratin fibers and the skin as much as possible, it is not desirable to set a pH that is too high. It is therefore preferred that the pH of the ready-to-use dyeing agent which can be prepared from the kit according to the invention or preferred 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.

[0103] The anhydrous coloring composition (FZ) may further contain additional active substances, adjuvants and additives. Thus, one or more fatty constituents from the group of C12-C30 fatty alcohols, C12-C30 fatty acid triglycerides, C12-C30 fatty acid monoglycerides, C12-C30 fatty acid diglycerides and / or hydrocarbons may, for example, be present.

[0104] Preferably, the anhydrous coloring composition (FZ) may additionally contain a surfactant substance, these surfactant substances being called surfactants or emulsifiers, depending on the field of application: they are preferably chosen from anionic, zwitterionic, amphoteric and non-ionic surfactants and emulsifiers.

[0105] In addition, the anhydrous coloring composition (FZ) may contain other active substances, adjuvants and additives, such as non-ionic polymers, for example polyethylene glycols solid under standard conditions, quaternized cellulose ethers, hair conditioning compounds such as phospholipids, for example lecithin; perfume oils, active ingredients improving the fiber structure, in particular mono-, di- and oligosaccharides such as glucose, galactose, fructose and lactose; dyes for coloring of the agent; amino acids and oligopeptides; protein hydrolysates of animal and / or vegetable origin, as well as in the form of their fatty acid condensation products or their optionally anionically or cationically modified derivatives; fatty substances and vegetable oils; active ingredients such as panthenol, pantothenic acid, pantolactone, pyrrolidinonecarboxylic 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.

[0106] Regarding other preferred embodiments of the coloring methods according to the invention and preferred according to the invention, what has been set out on the coloring kits according to the invention and preferred according to the invention applies mutatis mutandis.

[0107] Another object of the present invention is the use of precipitated silica in the coloring kits according to the invention and preferred according to the invention and the coloring methods according to the invention and preferred according to the invention as a thickener. What has been explained on the preferred embodiments of the precipitated silica applies mutatis mutandis to the preferred uses according to the invention as a thickener.

[0108] The following examples illustrate the present invention, without however limiting it:

[0109] Examples: (all quantities indicated are expressed in grams)

[0110] [Tables 1] Example 1 Example 2 Example 3 Example 4 Oxidizing composition (OZ) 6,000 6,000 9,500 13,000 Sodium percarbonate 4,000 4,000 2,000 6,000 Sodium sulfate 2,000 Sodium chloride 2,000 2,000 4,000 Sipemat 22 (INCI: Silica, precipitated silica) 5,500 3,000 Coloring composition (FZ) 10,000 10,000 12,500 15,000 Basic magnesium carbonate (magnesium carbonate hydroxide) heavy, pharm.400 g / 1 1.000 1.000 0.900 1.000 Sipemat 22 0.500 0.500 0.035 5.100 Aeroperl 300 / 30 (INCI: Silica, fumed silicic acid) 0.040 0.040 0.040 0.040 p-Toluylenediamine sulfate 1.970 1.970 1.970 1.970 2,4-Diaminophenoxyethanol 2HC1 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 sulfate 1.245 1.235 2.100 1.535 Anhydrous sodium metasilicate* - - - - Britesil C 265 * 1.600 1.600 4.100 1.600 Sodium carboxymethylcellulose (INCI: Cellulose Gum; Cekol 50000) 1.800 1.800 1.700 1.900 Xanthan 0.600 0.600 0.400 0.600 Succinic acid - 0.010 0.010 0.010 Liquid paraffin 0.165 0.165 0.165 0.165 Municipal water 100 100 100 100 . Ready-to-use coloring agent (AWF) 116 116 122 128 PH 9.5 9.5 9.3 9.5 Viscosity [Pa s] (Brookfield LVDVII+, No. 5, 4 rpm, 20 °C) 74.6 71.2 73.1 70.2

[0111] * Britesil C 265: Hydrated sodium silicate, Akzo PQ Silica, molar ratio SiO2 / Na2O: 2.65

[0112] *Fine anhydrous sodium metasilicate: Silmaco FE powder, SiO2 / Na2 O molar ratio: 0.91 - 1.01

[0113] The anhydrous oxidation composition (OZ) and the anhydrous coloring composition (FZ) remained packaged separately from each other, for example in a sachet package, until the preparation of the ready-to-use coloring agent.

[0114] Just before application to the hair, the anhydrous oxidation composition (OZ) and the anhydrous coloring composition (FZ) were mixed with the amount of water (municipal water, tap water) indicated in the table above and mixed to form a homogeneous mass, the ready-to-use coloring agent.

[0115] Directly after its preparation, the ready-to-use coloring agent was applied to human hair.

[0116] After a setting time of 30 minutes, the coloring agent was rinsed thoroughly with water.

[0117] Optionally, the hair was then cleansed with a shampoo containing a surfactant and conditioned with a conditioner. After rinsing out the conditioner, the hair was first towel dried and then blow-dried at approximately 85°C.

[0118] The hair was colored blue-black.

[0119] Examples: (all quantities indicated are expressed in % by weight)

[0120] [Tables2] Example 5 Example 6 Coloring composition (FZ) 10,000 10,000 Basic magnesium carbonate (magnesium carbonate hydroxide) heavy, pharm. 400 g / 1 8,500 8,500 Sipemat 22 8,000 - Aeroperl 300 / 30 (INCI: Silica, fumed silicic acid) 0,300 0,300 Sodium sulfate 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 sulfate 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 Liquid paraffin 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

[0121] The coloring compositions (FZ) of Example 5 (according to the invention) and Example 6 (comparative example) were each mixed with water in a weight ratio (FZ) to water of 10:100 to form a homogeneous cream. The viscosity of the two creams was determined using a Haake iQ viscometer (2400 seconds with CCB25 cup and CC25 coaxial cylinder, shear rate: 4.0 / s ').

[0122] The addition of precipitated silica allows for a higher maximum viscosity as well as a higher average viscosity.

Claims

Claims

1. 1. Kit for coloring by oxidation of keratin fibers, in particular human hair, including (i) an anhydrous oxidation composition (OZ), containing at least one solid oxidizing agent, activatable with water, chosen from sodium percarbonate and sodium perborate, and containing no polysaccharide, (ii) separately from (OZ), an anhydrous cosmetic coloring composition (FZ), containing - at least one developer-type oxidation dye precursor and at least one coupler-type oxidation dye precursor, as well as - at least one alkalizing agent chosen from sodium silicates and sodium metasilicates, each having a SiO 2 / Na2O molar ratio of 0.8 to 3.7, preferably of 1.0 to 3.6, particularly preferably of 2.5 to 3.5, as well as - at least one polysaccharide as a thickener, chosen from sodium carboxymethylcellulose and xanthan gum and their mixtures, the kit not comprising any constituent having a persulfate content, characterized in that at least one of the compositions (FZ) or (OZ) contains precipitated silica.

2. A process for the oxidation coloring of keratin fibers, in particular human hair, comprising the following steps: (i) providing an anhydrous oxidation composition (OZ), containing at least one solid oxidizing agent, activatable with water, chosen from sodium percarbonate and sodium perborate, and containing no polysaccharide, and separately therefrom, providing an anhydrous cosmetic coloring composition (FZ), the coloring composition (FZ) containing: - at least one developer-type oxidation dye precursor and at least one coupler-type oxidation dye precursor, as well as - at least one alkalizing agent chosen from sodium silicates and sodium metasilicates, each having a SiO 2 / Na2O molar ratio of 0.8 to 3.7, preferably of 1.0 to 3.6, particularly preferably of 2.5 to 3.5, as well as

3.

4. - at least one polysaccharide as a thickener, chosen from sodium carboxymethylcellulose and xanthan gum and their mixtures, (ii) mixing the composition (OZ), the cosmetic coloring composition (FZ) and water to form a ready-to-use coloring agent, (iii) directly after step (ii), application of the ready-to-use coloring agent to keratin fibers, in particular to human hair, (iv) applying the ready-to-use coloring agent to the keratin fibers, in particular to human hair, for 5 to 60 minutes, preferably for 15 to 45 minutes, particularly preferably for 30 minutes, (v) then rinsing the keratin fiber coloring agent with water, optionally washing the fibers with a cleaning agent containing a surfactant, conditioning the fibers with a conditioning agent and / or drying the fibers, no persulfate being used in the process, characterized in that the weight ratio between the sum of the weights of the compositions (OZ) and (FZ) and the weight of the quantity of water used in step (ii), [(OZ)+(FZ)] / [water], is in the range from 10:100 to 28:100, preferably from 11:100 to 24:100, particularly preferably from 12:100 to 22:100, very particularly preferably from 13:100 to 20:100, even more preferably from 14:100 to 19:100, exceptionally preferably from 16:100 to 18.1:100, further characterized in that at least one of compositions (FZ) or (OZ) contains precipitated silica as a thickener. Dyeing kit according to claim 1 or dyeing method according to claim 2, characterized in that the composition (FZ) contains, in each case relative to its weight, 5 to 25% by weight, preferably 10 to 22% by weight, particularly preferably 12 to 19% by weight, exceptionally preferably 13 to 18% by weight of sodium carboxymethylcellulose and / or 2 to 10% by weight, preferably 3 to 8% by weight, particularly preferably 4 to 7% by weight, exceptionally preferably 5.5 to 6% by weight of xanthan gum. Coloring kit according to claim 1 or 3 and coloring method according to claim 2 or 3, characterized in that a mixture of car- sodium carboxymethylcellulose and xanthan gum is present as a thickener, wherein the weight ratio of sodium carboxymethylcellulose to xanthan gum is in the range of 2.5:1 to 5:1, preferably 3:1 to 4.3:

1.

5. Coloring kit according to claim 1, 3 or 4 and coloring method according to one of claims 2 to 4, characterized in that the anhydrous cosmetic coloring composition (FZ) further contains basic magnesium carbonate (magnesium carbonate hydroxide).

6. Coloring kit according to one of claims 1 or 3 to 5 and coloring method according to one of claims 2 to 5, characterized in that no ammonium salt is present.

7. Coloring kit according to one of claims 1 or 3 to 6 and coloring method according to one of claims 2 to 6, characterized in that no polymer or copolymer with monomers containing acrylate, methacrylate or vinyl and no polyurethane are present.

8. Coloring kit according to one of claims 1 or 3 to 7 and coloring method according to one of claims 2 to 7, characterized in that at least one solid oxidizing agent, activatable with water, chosen from sodium percarbonate and sodium perborate, is contained in the composition (OZ) in a total amount of 20 to 100% by weight, preferably 40 to 90% by weight, preferably 45 to 80% by weight, in particular 55% to 70% by weight, relative to the weight of the composition (OZ).

9. Coloring kit according to one of claims 1 or 3 to 8 and coloring method according to one of claims 2 to 8, characterized in that the anhydrous cosmetic coloring composition (FZ) and the anhydrous composition (OZ) are present in a weight ratio of [FZ] / [OZ] in the range of 1:1 to 6:1, preferably 1.1:1 to 4:1, particularly preferably 1.5:1 to 3:

1.

10. Dyeing kit according to one of claims 1 or 3 to 9 and dyeing method according to one of claims 2 to 9, characterized in that the anhydrous dyeing composition (FZ) contains precipitated silica as thickener at a concentration of 0.2 to 50.0% by weight, preferably 1.0 to 35% by weight, particularly preferably 5 to 10% by weight, in each case relative to the weight of the dyeing composition (FZ).

11. Dyeing kit according to one of claims 1 or 3 to 10 and dyeing method according to one of claims 2 to 10, characterized in that the anhydrous oxidation composition (OZ) contains precipitated silica as thickener at a concentration of 0.2 to 80.0% by weight, preferably 1.0 to 60% by weight, particularly preferably 5 to 25% by weight, exceptionally preferably 8 to 15% by weight, in each case relative to the weight of the oxidation composition (OZ).

12. Dyeing method according to one of claims 2 to 11, characterized in that the ready-to-use dyeing agent contains 1.0 to 7.0% by weight, preferably 1.5 to 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 relative to the weight of the ready-to-use dyeing agent.

13. Dyeing method according to one of claims 2 to 12, characterized in that the ready-to-use dyeing agent contains 1.0 to 7.0% by weight, preferably 1.5 to 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 relative to the weight of the ready-to-use dyeing agent.

14. Use of precipitated silica in a coloring kit according to one of claims 1 or 3 to 11 or in a coloring process according to one of claims 2 to 13 as a thickener.