Process for homogeneous coloring of keratin fibers

Abstract

A method of dyeing human hair comprising the following steps in the order given A) mixing a first aliquot of a first component (K1) with a second component (K2) to obtain a first mixture (M1), B) Apply the mixture (M1) to selected areas of the hair, C) mixing a second aliquot of the first component (K1) with a third component (K3) to obtain a second mixture (M2), D) Apply the mixture (M2) to selected areas of the hair that have not been treated with (M1), E) Leave the mixtures (M1) and (M2) on the hair for a period of 30 seconds to 60 minutes at room temperature or at 30 - 60°C, F) Rinse the mixtures (M1) and (M2) from the hair, whereby - component (K1) is a water-based dyeing preparation containing at least one oxidation dye precursor and having a pH in the range from 8 to 11, measured at 22°C, - the second component (K2) is a water-containing hydrogen peroxide preparation which does not contain an oxidation dye precursor and has a pH in the range from 3 to 6.9, measured at 22°C, and - the third component (K3) is a water-containing hydrogen peroxide preparation which does not contain an oxidation dye precursor and has a pH in the range of 1.0 to 2.8, measured at 22°C, and - the pH of the mixture (M1) is at least 0.2 units lower than the pH of the component (K1) and - the pH of the mixture (M2) is at least 0.2 units lower than the pH of the mixture (M1), characterized in that the first component (K1) contains at least one cationic polymer.

Description

[0001] The present invention is in the field of cosmetics and relates to methods for the oxidative coloring of hair, using application mixtures that are produced via a special mixing process.

[0002] Changing the color of keratin fibers, especially hair, represents an important area of ​​modern cosmetics. This allows the appearance of the hair to be adapted to both current fashion trends and the individual's wishes. Professionals know various options for changing hair color. The use of direct dyes can temporarily alter the hair color. In this process, the fully formed pigments diffuse from the dyeing agent into the hair fiber. Coloring with direct dyes is associated with minimal hair damage; however, a disadvantage is the short shelf life and rapid washout of the colorings achieved with direct dyes.

[0003] If the consumer desires a long-lasting color result or a shade lighter than their original hair color, oxidative color-changing agents are typically used. For permanent, intense colorings with corresponding fastness properties, so-called oxidation dyes are used. Such dyes typically contain oxidation dye precursors, so-called developer components, and coupler components, which, under the influence of oxidizing agents, form the actual dyes. Oxidation dyes are characterized by long-lasting coloring results.

[0004] Level 3 colorants are particularly commonly used in the hairdressing industry. Level 3 colorants are oxidative colorants characterized by particularly good durability and particularly high gray coverage.

[0005] This good durability and good gray coverage can be achieved through a high ammonia content in the colorants, which leads to significant swelling of the hair and, consequently, a high diffusion rate of the oxidation dye precursors into the hair. In dark shades of Level 3 colorants, the content of oxidation dye precursors is also comparatively high. However, this high ammonia content is also associated with significant hair damage.

[0006] At home, users who don't want to accept this high level of hair damage with every coloring session can opt for Level 2 products. Level 2 products are also oxidative colorants, but their ammonia content is lower, or alternative, less swelling alkalizing agents are used instead of ammonia. At home, Level 3 and Level 2 products are packaged separately and sold as separate products, allowing users to choose and apply either a Level 3 or a Level 2 product.

[0007] In the hairdressing sector, the hairdresser offers their customers a much more extensive range of shades. Thus, a complete Level 3 coloring series includes a range of different color creams, each of which is mixed with the standard Level 3 oxidizing agent composition shortly before application. For capacity and storage reasons, the hairdresser will avoid stocking a complete range of shades for both Level 3 and Level 2 products.

[0008] It was therefore a first object of the present invention to provide the hairdresser with a flexible and easy-to-use method that allows the hairdresser to produce a Level 2 product from a Level 3 coloring product.

[0009] Furthermore, the extent of damage varies from root to tip. Hair at the roots has just grown in and has been exposed to little or no weathering, chemical (dyeing, bleaching, perming, washing, swimming pool water), or physical (combing, blow-drying) influences. The further away from the roots and therefore the older the hair, the more damaged the hair lengths are. The hair at the tips is the oldest part of the hair and therefore shows the most severe damage.

[0010] In damaged hair, the cuticle, the hair's cuticle layer, is damaged to a greater or lesser extent. This leads to a generally stronger color lift on damaged hair. Therefore, if the roots and ends are colored with the same dye, there is always a risk of uneven color results on more severely damaged hair.

[0011] For the purposes of this application, the hair ends are considered part of the hair length. Whenever reference is made to hair length, the hair ends are always included.

[0012] According to the invention, the hairline is understood to be the area of ​​hair directly adjacent to the scalp (the first 0 to 5 cm of the hair).

[0013] Accordingly, the hair length range is understood to be the area of ​​the hair fiber that is more than 5 cm from the scalp. According to the invention, the hair tip range is understood to be the last 3 cm of the hair fiber.

[0014] It was a further object of the present invention to provide the hairdresser or the home user with a system with which he can reduce the dye concentration in the hair dye in a simple, targeted and precisely reproducible manner after assessing the degree of damage to the hair to be dyed.

[0015] Both the production of a Level 2 coloring product from a Level 3 product and the reduction of the dye concentration for application to specific hair sections can, in principle, be achieved by diluting the oxidative Level 3 product. Various methods for this are already known from the state of the art.

[0016] EP 2 881 145 A2, EP 2 881 146 A2 and WO 2013 / 126657 A2 disclose oxidative hair dyeing methods in which firstly an oxidizing agent composition and a dyeing cream containing an alkalizing agent are mixed together and part of this mixture is applied to the hair, preferably to the hair roots, without further dilution, while the remaining part of the mixture is diluted with a water-containing and / or a non-aqueous solution and then also applied to the hair, particularly to the hair lengths.WO 93 / 01792 A1 discloses an oxidative hair dyeing process based on a dye carrier composition F which contains a developer substance-coupler substance combination and which is applied after mixing with an oxidizing agent, in which, in a first step, the dye carrier composition F is mixed with a preparation A containing an oxidizing agent, and then the resulting mixture FA is applied to the hair roots (hair regrowth) and allowed to act, and in a second step, the dye carrier composition F is mixed with a preparation B containing an oxidizing agent, and then the resulting mixture FB is applied to the lengths and ends of the hair and allowed to act, wherein preparation B has a more acidic pH than preparation A, and finally the hair is rinsed with water, after-treated if necessary and then dried. In order to improve the homogeneity of a dyeing or to reduce the selectivity of a dye orThe skilled person is aware of further methods for improving the balancing power of a coloring agent. EP 2 471 504 A1 addresses the problem of providing oxidative hair colorants with high balancing power, thus achieving uniform hair coloration both on the damaged sections of the hair fiber and on the undamaged or slightly damaged hair roots. EP 2 471 504 A1 solves this problem with an active ingredient combination of an amino acid surfactant, a cationic surfactant, and an oil. The oxidizing agent compositions used as examples have a relatively low pH of 2.5 or 3, which was each adjusted with phosphoric acid. A single mixture was prepared from the respective oxidizing agent composition and the coloring cream, which was then applied to the entire hair.

[0017] One possible dilution option is, for example, mixing the ready-to-use oxidative colorant with a conditioner. Since conditioners are often set to a slightly acidic pH, this can lower the pH of the colorant and reduce the extent of hair swelling. However, due to the conditioning substances contained in the conditioner (certain polymers, silicones, ionic surfactants, etc.), dilution with the conditioner can cause a color shift, so that the color result no longer corresponds to the desired color. nuance matches.

[0018] Another dilution option is to mix the ready-to-use oxidative colorant with a shampoo. Since shampoos contain large amounts of cleansing surfactants, excessive foaming during application can occur, making it impossible to fully coat the hair with the diluted colorant. If the shampoo is not sufficiently acidic, excessive amounts of shampoo will be required to dilute the colorant.

[0019] It has now surprisingly been found that the coloring agent can be diluted flexibly, quickly and conveniently without the disadvantages described above if the hairdresser follows a process in which first an alkalizing agent-containing coloring cream (K1) containing at least one cationic polymer is mixed with a first oxidizing agent composition (K2) and a first homogeneous mixture (M1) is prepared from these two components and then applied to the hair, preferably to the hair roots, then another aliquot of the same alkalizing agent-containing coloring cream (K1) is mixed with a second oxidizing agent composition (K3) and a second homogeneous mixture (M2) is prepared from these two components and then applied to the hair that has not been treated with (M1), preferably to the hair lengths / tips,The second oxidizing agent composition (K3) has a significantly lower pH than the first oxidizing agent composition (K2). After the contact time, both hair dyes are rinsed out of the hair, and the hair is then treated in the usual way, e.g., with a shampoo and / or conditioner, followed by drying. The second oxidizing agent composition (K3) is matched to the coloring cream (K1) in such a way that, regardless of the degree of damage to the entire hair, a homogeneous color is achieved along the hair fibers. Furthermore, the three components (K1), (K2), and (K3) are matched to one another in such a way that the mixing ratio (K1):(K2) specified for a specific shade for the roots can also be applied to the mixing ratio (K1):(K3) for the lengths and ends of the hair.

[0020] The hairdresser therefore only needs to stock a single assortment of coloring creams (K1). Depending on the need for Level 3 or Level 2 coloring, they combine the coloring cream (K1) either with the less acidic oxidizing agent composition (K2) or with the more acidic oxidizing agent composition (K3). Mixture (M2) has a lower pH than mixture (M1) and thus achieves less harsh reaction conditions on previously damaged hair. Furthermore, the three components (K1), (K2), and (K3) are preferably coordinated in such a way that mixture (M1) achieves the same color tone on the little or not damaged sections of the hair fiber (root) as mixture (M2) achieves on the damaged sections of the hair fiber (lengths / ends).

[0021] A first object of the present invention is a method for dyeing human

[0022] Hair, comprising the following steps in the given order: A) mixing a first aliquot of a first component (K1) with a second component (K2) to obtain a first mixture (M1), B) Apply the mixture (M1) to selected areas of the hair, especially to the roots, C) mixing a second aliquot of the first component (K1) with a third component (K3) to obtain a second mixture (M2), D) Apply the mixture (M2) to selected areas of the hair that have not been treated with (M1), especially to the lengths / ends of the hair, E) Allowing the mixtures (M1) and (M2) to act on the hair for a period of 30 seconds to 60 minutes, preferably 20 to 45 minutes, at room temperature and / or at 30 to 60°C, preferably at 32 to 50°C, F) Rinse the mixtures (M1) and (M2) from the hair, whereby - component (K1) is a water-containing dye preparation which contains at least one oxidation dye precursor and has a pH in the range from 8 to 11, preferably in the range from 8.5 to 10.7, particularly preferably in the range from 9 to 10.1, in each case measured at 22°C, - the second component (K2) is a water-containing hydrogen peroxide preparation which does not contain an oxidation dye precursor and has a pH in the range from 3 to 6.9, preferably 3.1 to 4.5, particularly preferably 3.2 to 4.0, in each case measured at 22°C, and - the third component (K3) is a water-containing hydrogen peroxide preparation which does not contain an oxidation dye precursor and has a pH in the range from 1.0 to 2.8, preferably 1.2 to 2.4, particularly preferably 1.4 to 2.0, in each case measured at 22°C, and - the pH of the mixture (M1) is at least 0.2 units lower than the pH of the component (K1) and - the pH of the mixture (M2) is at least 0.2 units lower than the pH of the mixture (M1),wherein the process is characterized in that the first component (K1) contains at least one cationic polymer.

[0023] For the purposes of the invention, the term “room temperature” refers to the temperature in the room in which a person usually uses a hair dye, i.e. usually a bathroom or a hair salon, where the temperature is in the range of 10 - 29 °C.

[0024] Leaving the hair-dyeing application mixtures (M1) and (M2) in process step D) in the hair-dyeing processes according to the invention or preferred according to the invention can also take place at at least 30 °C, preferably at 30 - 60 °C, particularly preferably at 32 - 50 °C, if the hair is heated, for example, with a heat cap or with a heat lamp.

[0025] Components (K1), (K2) and (K3) are cosmetic products that contain all essential ingredients in a water-based cosmetic carrier.

[0026] In a first step A), a first aliquot of a first component (K1) is mixed with a second component (K2). The first component (K1) is a water-based dye preparation containing at least one oxidation dye precursor and having a pH in the range of 8 to 11, preferably in the range of 8.5 to 10.7, particularly preferably in the range of 9 to 10.1, each measured at 22°C.

[0027] The first component (K1) preferably contains at least one oxidation dye precursor of the developer type and at least one oxidation dye precursor of the coupler type.

[0028] The first component (K1) preferably contains at least one oxidation dye precursor selected from the group consisting of p-tolylenediamine, 2-(2-hydroxyethyl)-p-phenylenediamine, N,N-bis-(2-hydroxyethyl)-p-phenylenediamine, 2-methoxymethyl-p-phenylenediamine, N-(4-amino-3-methylphenyl)-N-[3-(1H-imidazol-1-yl)propyl]amine, bis-(2-hydroxy-5-aminophenyl)methane, 4-aminophenol, 4-amino-3-methylphenol, 4,5-diamino-1-(2-hydroxyethyl)pyrazole, 2,4,5,6-tetraaminopyrimidine, 4-hydroxy-2,5,6-triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine and / or their physiologically acceptable salts.

[0029] The second component (K2) is a water-containing hydrogen peroxide preparation which does not contain an oxidation dye precursor and has a pH in the range from 3 to 6.9, preferably 3.1 to 4.5, particularly preferably 3.2 to 4.0, in each case measured at 22°C.

[0030] The first component (K1) and the second component (K2) can be mixed together, for example by stirring or shaking, to form the first mixture (M1).

[0031] The pH of the mixture (M1) is at least 0.2 units lower than the pH of the component (K1).

[0032] In a preferred embodiment of the process according to the invention, the first component (K1) and the second component (K2) are mixed together in a weight ratio of 3:1 to 1:3, preferably 2:1 to 2:1, most preferably 1:1.

[0033] In the second step, the mixture (M1) is applied according to the invention to selected areas of the hair, in particular to the hairline.

[0034] In the third step, a second aliquot of the first component (K1) is mixed with a third component (K3) to obtain a second mixture (M2).

[0035] The third component (K3) is a water-containing hydrogen peroxide preparation which does not contain an oxidation dye precursor and has a pH in the range from 1.0 to 2.8, preferably 1.2 to 2.4, particularly preferably 1.4 to 2.0, in each case measured at 22°C.

[0036] The pH value can be measured, for example, using a glass electrode, which is usually designed as a combination electrode. The pH values ​​used in the present invention are pH values ​​measured at a temperature of 22 °C.

[0037] The first component (K1) and the third component (K3) can also be mixed together, for example by stirring or shaking, to form the second mixture (M2).

[0038] It is essential to the invention that the pH value of the mixture (M2) is at least 0.2 units lower than the pH value of the mixture (M1).

[0039] In a preferred embodiment of the method according to the invention, the first component (K1) and the third component (K3) are mixed together in a weight ratio of 3:1 to 1:3, preferably 2:1 to 2:1, extremely preferably 1:1. The mixing ratios (K1):(K2) and (K1):(K3) can be selected independently of one another. However, it may be preferred according to the invention if, within a method, the weight ratio (K1):(K2) is equal to the weight ratio (K1):(K3). This simplifies the hairdresser's work, since they only have to remember one mixing ratio for the preparation of both mixtures (M1) and (M2).

[0040] In the fourth step, the mixture (M2) is applied according to the invention to selected areas of the hair that have not been treated with (M1), in particular to the lengths and / or ends of the hair.

[0041] After application, the mixtures (M1) and (M2) are then allowed to act on the hair in step E) for a period of 30 seconds to 60 minutes, preferably 20 to 45 minutes, at room temperature and / or at 30 to 60°C, preferably at 32 to 50°C. In this case, it is possible and in accordance with the invention to leave the mixture (M2) on all sections of the hair treated with (M2) for a specific period of time. In a further embodiment, however, it is also possible to select different exposure times for specific sections of hair, so that, for example, the exposure time in the area of ​​the hair lengths, in particular the upper lengths close to the roots, is longer than the exposure time in the area of ​​the damaged tips.

[0042] After allowing the mixtures (M1) and (M2) to work, they are then rinsed out of the hair in step F). Rinsing can be done either with water alone or with the help of a shampoo.

[0043] Steps A) to F) are the steps of a single dyeing process, ie all steps are carried out according to the invention during one dyeing process, ie within a maximum period of 6 hours, preferably within a maximum period of 3 hours.

[0044] In the process according to the invention, the order of the steps is also fixed and takes place in the order A), followed by B), followed by C), followed by D) followed by E) followed by F).

[0045] In order to ensure a consistency of the mixture (M1) which is suitable for application technology, a preferred method according to the invention for dyeing human hair is characterized in that the second component (K2), in each case based on its weight, contains one or more fatty components in a total amount of 0.1 to 70 wt.%, preferably 2 to 50 wt.%, more preferably 3.5 to 21 wt.% and very particularly preferably 8 to 15 wt.%.

[0046] In order to ensure a consistency of the mixture (M2) which is suitable for application technology, a preferred method according to the invention for dyeing human hair is characterized in that the third component (K3), in each case based on its weight, contains one or more fatty components in a total amount of 0.1 to 70 wt.%, preferably 2 to 50 wt.%, more preferably 3.5 to 21 wt.% and very particularly preferably 8 to 15 wt.%.

[0047] For the purposes of the invention, "fatty constituents" are understood to mean organic compounds with a solubility in water at room temperature (22 °C) and a pressure of 1013 mbar of less than 1 wt.%, preferably less than 0.1 wt.%. The definition of fatty constituents explicitly includes only uncharged (i.e., non-ionic) compounds. Fatty constituents have at least one saturated or unsaturated alkyl group with at least 8 carbon atoms. The molecular weight of the fatty constituents is a maximum of 5000 g / mol, preferably a maximum of 2500 g / mol, and particularly preferably a maximum of 1000 g / mol. The fatty constituents are neither polyoxyalkylated nor polyglycerylated compounds.

[0048] In this context, the preferred fat components are those from the group of C 12 -C 30 -fatty alcohols, the C 12 -C 30-Fatty acid triglycerides, the ester of linear or branched saturated or unsaturated fatty alcohols with 2 - 30 carbon atoms with linear or branched saturated or unsaturated fatty acids with 2 - 30 carbon atoms, which may be hydroxylated, the C 12 -C 30 -fatty acid monoglycerides, the C 12 -C 30 -fatty acid diglycerides and / or hydrocarbons. For the purposes of the present invention, only non-ionic substances are explicitly considered fatty components. Charged compounds, such as fatty acids and their salts, are not considered fatty components.

[0049] At the C 12 -C 30 Fatty alcohols can be saturated, mono- or polyunsaturated, linear or branched fatty alcohols with 12 to 30 carbon atoms. Examples of preferred linear, saturated C 12 -C 30-Fatty alcohols are dodecan-1-ol (dodecyl alcohol, lauryl alcohol), tetradecan-1-ol (tetradecyl alcohol, myristyl alcohol), hexadecan-1-ol (hexadecyl alcohol, cetyl alcohol), octadecan-1-ol (octadecyl alcohol, stearyl alcohol), arachyl alcohol (eicosan-1-ol), heneicosyl alcohol (heneico-san-1-ol) and / or behenyl alcohol (docosan-1-ol).

[0050] Preferred linear, unsaturated fatty alcohols are (9Z)-octadec-9-en-1-ol (oleyl alcohol), (9E)-octadec-9-en-1-ol (elaidyl alcohol), (9Z,12Z)-octadeca-9,12-dien-1-ol (linoleyl alcohol), (9Z,12Z,15Z)-octadeca-9,12,15-trien-1-ol (linolenoyl alcohol), gadoleyl alcohol ((9Z)-eicos-9-en-1-ol), arachidonic alcohol ((5Z,8Z,11Z,14Z)-eicosa-5,8,11,14-tetraen-1-ol), erucyl alcohol ((13Z)-docos-13-en-1-ol) and / or brassidyl alcohol ((13E)-docosen-1-ol).

[0051] The preferred representatives for branched fatty alcohols are 2-octyldodecanol, 2-hexyldodecanol and / or 2-butyldodecanol.

[0052] Under a C 12 -C30 For the purposes of the present invention, fatty acid triglyceride is understood to be the triester of the trihydric alcohol glycerol with three equivalents of fatty acid. Both structurally identical and different fatty acids within a triglyceride molecule can participate in the ester formation.

[0053] Among fatty acids that contribute to the formation of the aforementioned C 12 -C 30 -fatty acid triglycerides are suitable according to the invention, saturated or unsaturated, unbranched or branched, unsubstituted or substituted C 12 -C 30 -Carboxylic acids. Unsaturated fatty acids can be monounsaturated or polyunsaturated. In an unsaturated fatty acid, its carbon-carbon double bond(s) can have a cis or trans configuration.

[0054] Particularly preferred fatty acid triglycerides according to the invention are those in which at least one of the ester groups is formed starting from glycerol with a fatty acid selected from dodecanoic acid (lauric acid), tetradecanoic acid (myristic acid), hexadecanoic acid (palmitic acid), tetracosanoic acid (lignoceric acid), octadecanoic acid (stearic acid), eicosanoic acid (arachidic acid), docosanoic acid (behenic acid), petroselinic acid [(Z)-6-octadecenoic acid], palmitoleic acid [(9Z)-hexadec-9-enoic acid], oleic acid [(9Z)-octadec-9-enoic acid], elaidic acid [(9E)-octadec-9-enoic acid], erucic acid [(13Z)-docos-13-enoic acid], linoleic acid [(9Z, 12Z)-octadeca-9,12-dienoic acid, linolenic acid [(9Z,12Z,15Z)-octadeca-9,12,15-trienoic acid, elaeostearic acid [(9Z,11E,13E)-octadeca-9,11,3-trienoic acid], arachidonic acid [(5Z,8Z,11Z,14Z)-icosa-5,8,11,14-tetraenoic acid] and / or nervonic acid [(15Z)-tetracos-15-enoic acid].

[0055] The fatty acid triglycerides can also be of natural origin. The fatty acid triglycerides found in soybean oil, peanut oil, olive oil, sunflower oil, macadamia nut oil, moringa oil, apricot kernel oil, marula oil, and / or optionally hydrogenated castor oil, or mixtures thereof, are particularly suitable for use in the process according to the invention.

[0056] Further fatty components particularly preferred according to the invention are selected from the esters of linear or branched saturated or unsaturated fatty alcohols having 2 - 30 carbon atoms with linear or branched saturated or unsaturated fatty acids having 2 - 30 carbon atoms, which may be hydroxylated. These preferably include 2-hexyldecyl stearate, 2-hexyldecyl laurate, isodecyl neopentanoate, isononyl isononanoate, 2-ethylhexyl palmitate and 2-ethylhexyl stearate, isopropyl myristate, isopropyl palmitate, isopropyl stearate, isopropyl isostearate, isopropyl oleate, isooctyl stearate, isononyl stearate, isocetyl stearate, isononyl isononanoate, isotridecyl isononanoate, cetearyl isononanoate, 2-ethylhexyl laurate, 2-ethylhexyl isostearate, 2-ethylhexyl cocoate, 2-octyldodecyl palmitate, butyloctanoic acid 2-butyloctanoate, diisotridecyl acetate, n-butyl stearate, n-hexyl laurate, n-decyl oleate, oleyl oleate, Oleyl erucate, erucyl oleate, erucylerucate, ethylene glycol dioleate and ethylene glycol dipalmitate.

[0057] Under a C 12 -C 30 A fatty acid monoglyceride is the monoester of the trihydric alcohol glycerol with one equivalent of fatty acid. Either the middle hydroxy group of the glycerol or the terminal hydroxy group of the glycerol can be esterified with the fatty acid.

[0058] Particularly preferred C according to the invention 12 -C 30-Fatty acid monoglycerides are those in which a hydroxy group of the glycerol is esterified with a fatty acid, wherein the fatty acids are selected from dodecanoic acid (lauric acid), tetradecanoic acid (myristic acid), hexadecanoic acid (palmitic acid), tetracosanoic acid (lignoceric acid), octadecanoic acid (stearic acid), eicosanoic acid (arachidic acid), docosanoic acid (behenic acid), petroselinic acid [(Z)-6-octadecenoic acid], palmitoleic acid [(9Z)-hexadec-9-enoic acid], oleic acid [(9Z)-octadec-9-enoic acid], elaidic acid [(9E)-octadec-9-enoic acid], erucic acid [(13Z)-docos-13-enoic acid], linoleic acid [(9Z, 12Z)-octadeca-9,12-dienoic acid, linolenic acid [(9Z,12Z,15Z)-octadeca-9,12,15-trienoic acid, elaeostearic acid [(9Z,11E,13E)-octadeca-9,11,3-trienoic acid], arachidonic acid [(5Z,8Z,11Z,14Z)-icosa-5,8,11,14-tetraenoic acid] or nervonic acid [(15Z)-tetracos-15-enoic acid].

[0059] Under a C 12 -C 30Fatty acid diglyceride is the diester of the trihydric alcohol glycerol with two equivalents of fatty acid. In this case, either the middle and one terminal hydroxyl group of the glycerol can be esterified with two equivalents of fatty acid, or both terminal hydroxyl groups of the glycerol can be esterified with a fatty acid. The glycerol can be esterified with either two structurally identical or two different fatty acids.

[0060] Particularly preferred C according to the invention 12 -C 30-Fatty acid diglycerides are those in which at least one of the ester groups is formed starting from glycerol with a fatty acid selected from dodecanoic acid (lauric acid), tetradecanoic acid (myristic acid), hexadecanoic acid (palmitic acid), tetracosanoic acid (lignoceric acid), octadecanoic acid (stearic acid), eicosanoic acid (arachidic acid), docosanoic acid (behenic acid), petroselinic acid [(Z)-6-octadecenoic acid], palmitoleic acid [(9Z)-hexadec-9-enoic acid], oleic acid [(9Z)-octadec-9-enoic acid], elaidic acid [(9E)-octadec-9-enoic acid], erucic acid [(13Z)-docos-13-enoic acid], linoleic acid [(9Z, 12Z)-octadeca-9,12-dienoic acid, linolenic acid [(9Z,12Z,15Z)-octadeca-9,12,15-trienoic acid, elaeostearic acid [(9Z,11E,13E)-octadeca-9,11,3-trienoic acid], arachidonic acid [(5Z,8Z,11Z,14Z)-icosa-5,8,11,14-tetraenoic acid] and / or nervonic acid [(15Z)-tetracos-15-enoic acid].

[0061] Hydrocarbons are compounds consisting exclusively of carbon and hydrogen atoms with 8 to 80 carbon atoms. Particularly preferred in this context are aliphatic hydrocarbons such as mineral oils, liquid paraffin oils (e.g., paraffinum liquidum or paraffinum perliquidum), isoparaffin oils, semi-solid paraffin oils, paraffin waxes, hard paraffin (paraffinum solidum), petrolatum, vaseline, and polydecenes.

[0062] Suitable paraffin oils include, in particular, liquid paraffin oils (Paraffinum Liquidum and Paraffinum Perliquidum). The hydrocarbon is particularly preferred as paraffin liquid, also known as white oil. Paraffin liquidum is a mixture of purified, saturated, aliphatic hydrocarbons, consisting primarily of hydrocarbon chains with a carbon chain distribution of 25 to 35 carbon atoms.

[0063] Preferred fat components are selected from the group of C 12 -C 30 -fatty alcohols, the C 12 -C 30 -Fatty acid triglycerides, the ester of linear or branched saturated or unsaturated fatty alcohols with 2 - 30 carbon atoms with linear or branched saturated or unsaturated fatty acids with 2 - 30 carbon atoms, which may be hydroxylated, the C 12 -C 30 -fatty acid monoglycerides, the C 12 -C 30 -fatty acid diglycerides and / or hydrocarbons. The C 12 -C 30 -Fatty alcohols and / or hydrocarbons are preferred fat components. Particularly preferred fat components are the C 12 -C 30 -fatty alcohols.

[0064] The aim of mixing the coloring cream (K1) with the oxidizing agent composition (K3) is to specifically reduce the pH of the application mixture (M2), which is to be applied to the hair lengths and ends that exhibit a greater degree of damage than the hair at the roots. This is associated with a reduction in hair swelling during the application of (M2) compared to the application of (M1). The mixture (M1), achieved by mixing (K1) and (K2), has a pH at least 0.2 units lower than component (K1).Since the oxidizing agent composition (K3) has a lower pH than the oxidizing agent composition (K2), the mixture (M2) obtained by mixing (K1) with (K3) consequently also has a pH that is at least 0.2 units lower than the mixture (M1) of (K1) and (K2), in particular when (K1) and (K2) are mixed in the same weight ratio to one another as (K1) and (K3), which is particularly preferred according to the invention. This should enable the hairdresser to color the customer's hair—which may be severely damaged after repeated coloring treatments—in the usual shade without color shift, while avoiding additional hair damage wherever possible.

[0065] To adjust the pH in the range from 1.0 to 2.8, preferably 1.2 to 2.4, particularly preferably 1.4 to 2.0, each measured at 22°C, component (K3) contains at least one acid.

[0066] A reduction of the pH value without a perceptible color shift (between diluted and undiluted colorant) is possible if component (K3) contains at least one acid selected from the group consisting of lactic acid, citric acid, malic acid, tartaric acid, maleic acid, succinic acid, oxalic acid, ascorbic acid, sulfuric acid, hydrochloric acid and / or phosphoric acid.

[0067] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains at least one acid selected from the group consisting of lactic acid, citric acid, malic acid, tartaric acid, maleic acid, succinic acid, oxalic acid, ascorbic acid, sulfuric acid, hydrochloric acid and / or phosphoric acid.

[0068] The addition of lactic acid, malic acid, tartaric acid or phosphoric acid to (K3) has proven to be particularly suitable in this context.

[0069] In a very particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains at least one acid selected from the group consisting of lactic acid, malic acid, tartaric acid and phosphoric acid.

[0070] In order to ensure an effective reduction of the pH, the acid or acids in component (K3) are preferably contained in a total amount of 0.5 to 15.0 wt.%, preferably 1.0 to 8.0 wt.%, more preferably 1.5 to 6.0 wt.% and very particularly preferably 2.5 to 5.5 wt.%, in each case based on the weight of component (K3).

[0071] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3), in each case based on its weight, contains one or more acids in a total amount of 0.5 to 15.0 wt.%, preferably 1.0 to 8.0 wt.%, more preferably 1.5 to 6.0 wt.% and very particularly preferably 2.5 to 5.5 wt.%.

[0072] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains, based on its weight, 2.5 to 10.0 wt.% lactic acid.

[0073] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains, based on its weight, 3.0 to 8.0 wt.% lactic acid.

[0074] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 3.5 to 6.0 wt.% lactic acid.

[0075] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 3.8 to 5.5 wt.% lactic acid.

[0076] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 0.5 to 15.0 wt.% citric acid.

[0077] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.0 to 8.0 wt.% citric acid.

[0078] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.5 to 6.0 wt.% citric acid.

[0079] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 2.5 to 5.5 wt.% citric acid.

[0080] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 0.5 to 15.0 wt.% malic acid.

[0081] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.0 to 8.0 wt.% malic acid.

[0082] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.5 to 6.0 wt.% malic acid.

[0083] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 2.5 to 5.5 wt.% malic acid.

[0084] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 0.5 to 15.0 wt.% tartaric acid.

[0085] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.0 to 8.0 wt.% tartaric acid.

[0086] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.5 to 6.0 wt.% tartaric acid.

[0087] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 2.5 to 5.5 wt.% tartaric acid.

[0088] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 0.5 to 15.0 wt.% maleic acid.

[0089] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.0 to 8.0 wt.% maleic acid.

[0090] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.5 to 6.0 wt.% maleic acid.

[0091] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 2.5 to 5.5 wt.% maleic acid.

[0092] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 0.5 to 10.0 wt.% succinic acid.

[0093] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.0 to 8.0 wt.% succinic acid.

[0094] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.5 to 6.0 wt.% succinic acid.

[0095] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 2.5 to 5.5 wt.% succinic acid.

[0096] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 0.5 to 10.0 wt.% oxalic acid.

[0097] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.0 to 8.0 wt.% oxalic acid.

[0098] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.5 to 6.0 wt.% oxalic acid.

[0099] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 2.5 to 5.5 wt.% oxalic acid.

[0100] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 0.5 to 15.0 wt.% ascorbic acid.

[0101] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.0 to 8.0 wt.% ascorbic acid.

[0102] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.5 to 6.0 wt.% ascorbic acid.

[0103] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 2.5 to 5.5 wt.% ascorbic acid.

[0104] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 0.5 to 15.0 wt.% phosphoric acid.

[0105] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.0 to 8.0 wt.% phosphoric acid.

[0106] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 1.5 to 6.0 wt.% phosphoric acid.

[0107] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains 2.5 to 5.5 wt.% phosphoric acid.

[0108] To ensure good and homogeneous miscibility of components (K2) or (K3) with the coloring component (K1), it is preferred according to the invention if at least one of components (K2) or (K3), independently of one another, contains one or more surfactants. The addition of certain ionic surfactants to component (K2) or (K3) may, under certain circumstances, interact with oppositely charged constituents of the coloring component (K1) when mixed with (K1). This can be desirable, but also undesirable. For reasons of universal usability, it is therefore preferred that component (K2) or - independently of this - component (K3) contains one or more non-ionic surfactants. Non-ionic surfactants can also be referred to as non-ionic emulsifiers.

[0109] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that the second component (K2) contains one or more non-ionic surfactants.

[0110] In a further particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) contains one or more non-ionic surfactants.

[0111] A nonionic surfactant is a surfactant that carries no charge(s). In other words, a nonionic surfactant contains no dissociable functional groups and therefore cannot separate into ions in water. Nonionic surfactants are composed of a nonpolar moiety, preferably a hydrocarbon chain (alkyl chain) with at least 8 carbon atoms, and a polar moiety. The polar moiety in a nonionic surfactant can be, for example, a polyethylene glycol unit or a monosaccharide or polysaccharide unit.

[0112] Fatty alcohols (ie C8-C 30 -alkanols) with a fatty chain and only one hydroxyl group have very poor solubility in water and lack a sufficiently polar molecular moiety. Therefore, fatty alcohols are considered fatty components within the meaning of the present invention and explicitly not as nonionic surfactants.

[0113] The monoesters and diesters of fatty alcohols (ie C8-C 30 -alkanols) and ethylene glycol are considered fatty substances and explicitly not as non-ionic surfactants.

[0114] The monoesters, diesters and triesters of fatty alcohols (dH C8-C 30 -alkanols) and glycerin are considered fatty substances and explicitly not as non-ionic surfactants.

[0115] Suitable nonionic surfactants contain, for example, a polyol group, a polyalkylene glycol ether group, or a combination of polyol and polyglycol ether groups as a hydrophilic group. Such compounds are, for example, - Addition products of 5 to 50 mol of ethylene oxide and / or 5 to 50 mol of propylene oxide with linear and branched fatty alcohols having 8 to 30 C atoms, such as lauryl, myristyl, cetyl, but also stearyl, isostearyl and oleyl alcohol, and with fatty acids having 8 to 30 C atoms, - addition products of 5 to 50 mol of ethylene oxide and / or 5 to 50 mol of propylene oxide with linear and branched fatty alcohols having 8 to 30 C atoms and with fatty acids having 8 to 30 C atoms, end-capped with a methyl or C2-C6 alkyl radical, - Polyglycerol esters and alkoxylated polyglycerol esters, such as poly(3)glycerol diisostearate and poly(2)glycerol polyhydroxystearate. - Polyol fatty acid esters, such as pentaerythrityl distearate, - higher alkoxylated, preferably ethoxylated, mono-, di- and triglycerides, such as glycerol monolaurate + 20 ethylene oxide and glycerol monostearate + 20 ethylene oxide, - amine oxides, - Sorbitan fatty acid esters and addition products of ethylene oxide to sorbitan fatty acid esters, such as polysorbates and sorbitan monolaurate + 20 mol ethylene oxide (EO), - sugar fatty acid esters and addition products of ethylene oxide with sugar fatty acid esters, - Addition products of ethylene oxide with fatty acid alkanolamides and fatty amines, - fatty acid N-alkylglucamides, - Alkyl polyglycosides corresponding to the general formula RO-(Z) x , where R is alkyl, Z is sugar, and x is the number of sugar units. The alkyl polyglycosides usable according to the invention can contain only one specific alkyl radical R. However, these compounds are usually prepared from natural fats and oils or mineral oils. In this case, the alkyl radicals R are mixtures depending on the starting compounds or the respective processing of these compounds.

[0116] Particularly preferred non-ionic surfactants are ethoxylated fatty alcohols and C8-C 22 -Alkyl mono- and oligoglycosides were highlighted.

[0117] In a particularly preferred embodiment, the process for dyeing human hair is characterized in that at least one of the components (K2) or (K3) independently of one another contains one or more ethoxylated fatty alcohols of the formula (I), wherein R1 represents a saturated or unsaturated, unbranched or branched C8-C 30 -alkyl group, preferably a saturated, unbranched C 16 - or C 18 - alkyl group, and n represents an integer from 10 to 120, preferably an integer from 10 to 80, more preferably an integer from 10 to 50 and particularly preferably an integer from 10 to 30.

[0118] In a particularly preferred embodiment, the process for dyeing human hair is also characterized in that at least one of the components (K2) or (K3) independently of one another contains one or more alkyl mono- or polyglucosides of the formula (II), in which - m is an integer from 7 to 21, preferably from 9 to 19, more preferably from 9 to 17 and most preferably from 11 to 15 and - p is an integer from 1 to 4, preferably from 1 to 3 and particularly preferably from 1 to 2.

[0119] Dyeing processes preferred according to the invention are characterized in that component (K2), in each case based on its weight, contains at least one nonionic surfactant in a total amount of 0.2 to 5 wt.%, preferably 0.5 to 2 wt.%, and very particularly preferably 0.7 to 1 wt.%.

[0120] Further dyeing processes preferred according to the invention are characterized in that component (K3), in each case based on its weight, contains at least one nonionic surfactant in a total amount of 0.2 to 5 wt.%, preferably 0.5 to 2 wt.%, and very particularly preferably 0.7 to 1 wt.%.

[0121] The process according to the invention is intended to lower the pH of the mixture (M2), which is prepared by mixing a portion of the mixture (M1) obtained from (K1) and (K2) with a further amount of (K2), in a defined and reproducible manner compared to the pH of the mixture (M1). As already explained above, lowering the pH is intended to achieve a homogeneous dyeing result.

[0122] In this context, it has been found that the homogeneity of the staining result can already be significantly reduced if the pH value of the mixture (M2) is at least 0.2 units lower than the pH value of the mixture (M1).

[0123] In a further particularly preferred embodiment, the method for dyeing human hair is characterized in that - the components (K1) and (K2) contain water and - the pH of the mixture (M2) is at least 0.2 units lower than the pH of the mixture (M1).

[0124] Component (K1) is a water-containing dyeing preparation which contains at least one oxidation dye precursor and has a pH in the range from 8 to 11, preferably in the range from 8.5 to 10.7, particularly preferably in the range from 9 to 10.1, in each case measured at 22°C.

[0125] Dyeing processes preferred according to the invention are characterized in that component (K1) contains at least one oxidation dye precursor of the developer type and at least one oxidation dye precursor of the coupler type.

[0126] In a further very particularly preferred embodiment, the method for dyeing human hair is characterized in that the first component (K1) comprises at least one oxidation dye precursor of the developer type, selected from the group consisting of p-toluenediamine, 2-(2-hydroxyethyl)-p-phenylenediamine, N,N-bis-(2-hydroxyethyl)-p-phenylenediamine, 2-methoxymethyl-p-phenylenediamine, N-(4-amino-3-methylphenyl)-N-[3-(1H-imidazol-1-yl)propyl]-amine, bis-(2-hydroxy-5-aminophenyl)methane, 4-aminophenol, 4-amino-3-methylphenol, 4,5-diamino-1-(2-hydroxyethyl)pyrazole, 2,4,5,6-tetraaminopyrimidine, 4-hydroxy-2,5,6-triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine and / or their physiologically acceptable salts.

[0127] Preferred additional developer-type oxidation dye precursors are selected from the group consisting of 2-(1,2-dihydroxyethyl)-p-phenylenediamine, N,N-bis-(2-hydroxyethyl)-p-phenylenediamine, 2-methoxymethyl-p-phenylenediamine, 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-diaminopropan-2-ol, bis-(2-hydroxy-5-aminophenyl)methane, 1,3-bis-(2,5-diaminophenoxy)propan-2-ol, N,N'-bis-(4-aminophenyl)-1,4-diazacycloheptane, 1,10-bis-(2,5-diaminophenyl)-1,4,7,10-tetraoxa-decane, p-aminophenol, 4-amino-3-methylphenol, 4-amino-2-aminomethylphenol, 4-amino-2-(1,2-dihydroxyethyl)phenol, 4-amino-2-(diethylaminomethyl)phenol, 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 their physiologically tolerated salts.

[0128] Coupler components do not produce significant coloration during oxidative coloration alone, but always require the presence of developer components. Coupler components within the meaning of the invention allow at least one substitution of a chemical residue of the coupler with the oxidized form of the developer component. In this process, covalent bonds form between the coupler and developer components.

[0129] As a suitable coupler component according to the invention, at least one compound is preferably selected from one of the following classes: - m-aminophenol and / or its derivatives, - m-dihydroxybenzene and / or its derivatives, - m-diaminobenzene and / or its derivatives, - o-diaminobenzene and / or its derivatives, - o-aminophenol derivatives, such as o-aminophenol, - naphthalene derivatives containing at least one hydroxy group, - Di- or trihydroxybenzene and / or their derivatives, - pyridine derivatives, - pyrimidine derivatives, - monohydroxyindole derivatives and / or monoaminoindole derivatives, - monohydroxyindoline derivatives and / or monoaminoindoline derivatives, - Pyrazolone derivatives, such as 1-phenyl-3-methylpyrazol-5-one, - Morpholine derivatives, such as 6-hydroxybenzomorpholine or 6-aminobenzomorpholine, - Quinoxaline derivatives, such as 6-methyl-1,2,3,4-tetrahydroquinoxaline.

[0130] Mixtures of two or more compounds from one or more of these classes are also according to the invention within the scope of this embodiment.

[0131] Bevorzugte Oxidationsfarbstoffvorprodukte vom Kupplertyp sind ausgewählt aus der Gruppe, bestehend aus 3-Aminophenol, 5-Amino-2-methylphenol, 3-Amino-2-chlor-6-methylphenol, 2-Hydro-xy-4-aminophenoxyethanol, 5-Amino-4-chlor-2-methylphenol, 5-(2-Hydroxyethyl)-amino-2-methylphenol, 2,4-Dichlor-3-aminophenol, 2-Aminophenol, 3-Phenylendiamin, 2-(2,4-Diaminophenoxy)-ethanol, 1,3-Bis(2,4-diaminophenoxy)propan, 1-Methoxy-2-amino-4-(2-hydroxyethylamino)benzol, 1,3-Bis(2,4-diaminophenyl)propan, 2,6-Bis(2'-hydroxyethylamino)-1-methylbenzol, 2-({3-[(2-Hydroxyethyl)amino]-4-methoxy-5-methylphenyl}amino)ethanol, 2-({3-[(2-Hydroxyethyl)amino]-2-meth-oxy-5-methylphenyl}amino)ethanol, 2-({3-[(2-Hydroxyethyl)amino]-4,5-dimethylphenyl}amino)ethanol, 2-[3-Morpholin-4-ylphenyl)amino]ethanol, 3-Amino-4-(2-methoxyethoxy)-5-methylphenylamin, 1-Amino-3-bis-(2-hydroxyethyl)aminobenzol, Resorcin, 2-Methylresorcin, 4-Chlorresorcin, 1,2,4-Trihydroxybenzol, 2-Amino-3-hydroxypyridin,3-Amino-2-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 and / or 7-hydroxyindoline and their physiologically acceptable salts.

[0132] Furthermore, component (K1) may also contain one or more direct dyes.

[0133] The pH of component (K1) is alkaline and lies in the pH range from 8 to 11, preferably in the range from 8.5 to 10.7, particularly preferably in the range from 9 to 10.1, each measured at 22°C. The alkalizing agents usable according to the invention to establish the preferred pH values ​​are selected from the group consisting of ammonia, alkanolamines, basic amino acids, and inorganic alkalizing agents such as (alkali earth) metal hydroxides, (alkali earth) metal metasilicates, (alkali earth) metal phosphates, and (alkali earth) metal hydrogenphosphates. Preferred inorganic alkalizing agents are sodium hydroxide, potassium hydroxide, sodium silicate, and sodium metasilicate. Organic alkalizing agents preferred according to the invention are selected from monoethanolamine, 2-amino-2-methylpropanol, and triethanolamine.The basic amino acids usable as alkalizing agents according to the invention are preferably selected from the group consisting of arginine, lysine, ornithine, and histidine, particularly preferably arginine. Investigations into the present invention have shown that the process according to the invention is particularly suitable for colorant components (K1) that contain ammonium hydroxide as alkalizing agent, in particular for those colorant components (K1) that contain ammonium hydroxide as the main alkalizing agent. A main alkalizing agent according to the invention is understood to mean an alkalizing agent that makes up at least 55% by weight, preferably at least 70% by weight, particularly preferably at least 80% by weight, and extraordinarily preferably at least 90% by weight of the total amount of all alkalizing agents, based on the weight of the colorant component (K1).Furthermore, the investigations into the present invention have shown that the process according to the invention is particularly suitable for colorant components (K1) that contain at least one fatty component in a total amount of 0.5 to 70% by weight, preferably 5 to 50% by weight, particularly preferably 10 to 30% by weight, extraordinarily preferably 15 to 25% by weight, based in each case on the weight of component (K1). The fatty components suitable for (K1) are selected from the same substance classes as the fatty components disclosed above as suitable for (K2) and (K3), i.e., selected from the group of C. 12 -C 30 -fatty alcohols, the C 12 -C 30-Fatty acid triglycerides, the ester of linear or branched saturated or unsaturated fatty alcohols with 2 - 30 carbon atoms with linear or branched saturated or unsaturated fatty acids with 2 - 30 carbon atoms, which may be hydroxylated, the C 12 -C 30 -fatty acid monoglycerides, the C 12 -C 30 -fatty acid diglycerides and / or hydrocarbons.

[0134] Furthermore, it has been found in the context of the investigations on the present invention that the process according to the invention is particularly suitable for colorant components (K1) which obligatorily contain at least one cationic polymer, preferably in a total amount of 0.01 to 5% by weight, more preferably 0.05 to 2% by weight, particularly preferably 0.1 to 1.5% by weight, extraordinarily preferably 0.2 to 1% by weight, in each case based on the weight of component (K1).

[0135] Preferred cationic polymers according to the invention are selected from - cationic polymers composed of monomers with quaternary ammonium groups of the general formula (IIa), R 3 -CH=CR 4 -CO-Z-(C n H 2n )-N (+) R 5 R 6 R 7 A (-) (IIa), in the R 3 and R 4 independently represent hydrogen or a methyl group, R 5 , R 6 and R 7 independently of one another represent an alkyl group having 1 to 4 carbon atoms, Z represents an NH group or an oxygen atom, n represents an integer from 2 to 4 and A (-) represents the anion of an inorganic or organic acid, preferably selected from cationic polymers composed of acrylamidopropyltrimethylammonium chloride, particularly preferably selected from amphoteric polymers with cationic net charge, which are constructed by polymerization from a) cationic monomers with quaternary ammonium groups of the general formula (IIa), R 3 -CH=CR 4 -CO-Z-(C n H 2n )-N (+) R 5 R 6 R 7 A (-) (IIa), in the R 3 and R 4 independently represent hydrogen or a methyl group, R 5 , R 6 and R 7 independently of one another represent an alkyl group having 1 to 4 carbon atoms, Z represents an NH group or an oxygen atom, n represents an integer from 2 to 4 and A (-) represents the anion of an inorganic or organic acid, and b) at least one unsaturated carboxylic acid selected from acrylic acid, methacrylic acid and crotonic acid and from mixtures of these acids, wherein the at least one unsaturated carboxylic acid may be in the form of its salts, wherein the cationic monomers in the polymer are present in molar excess to the anionic monomers; extraordinarily preferably selected from amphoteric polymers with a cationic net charge, which contain the at least one monomer type of the general formula (IIa) and the at least one monomer type of the unsaturated carboxylic acid, selected from acrylic acid, methacrylic acid and crotonic acid and mixtures thereof, in a molar ratio of 60:40 to 95:5, preferably of 75:25 to 90:10, to one another, most preferably selected from amphoteric copolymers with a cationic net charge consisting of acrylamidopropyltrimethylammonium chloride and acrylic acid in a molar ratio of 60:40 to 95:5, preferably 75:25 to 90:10; - 2-[2-Hydroxy-3-(trimethylammonio)propoxy]ethylcellulose ether chloride, which is available, for example, under the INCI name Polyquaternium-10, - Terpolymers of acrylic acid, diallyldimethylammonium chloride and acrylamide, such as those available under the INCI name Polyquaternium-39, - Homopolymers of N,N,N-trimethyl-2-[(methyl-1-oxo-2-propenyl)oxy]ethanaminium chloride, such as those available under the INCI name Polyquaternium-37, - Copolymers of diallyldimethylammonium chloride and acrylic acid, such as those available under the INCI name Polyquaternium-22, - Hydroxyethylcellulose-dimethyldiallylammonium chloride copolymers, such as those available under the INCI name Polyquaternium-4, - Copolymers of acrylamide and beta-methacrylyloxyethyltrimethylammonium methosulfate, such as those available under the INCI name Polyquaternium-5, - Homopolymers of N,N-dimethyl-N-2-propenyl-2-propen-1-aminium chloride, such as those available under the INCI name Polyquaternium-6, - Copolymers of diallyldimethylammonium chloride and acrylamide, such as those available under the INCI name Polyquaternium-7, - Copolymers of vinylpyrrolidone and dimethylaminoethyl methacrylate diethyl sulfate, such as those available under the INCI name Polyquaternium-11, - quaternized celluloses selected from Polyquaternium-10, Polyquaternium-24, Polyquaternium-67 and Polyquaternium-72, - the polymers known as Polyquaternium-2, Polyquaternium-17, Polyquaternium-18 and Polyquaternium-27 with quaternary nitrogen atoms in the polymer main chain, - as well as mixtures of the aforementioned polymers.

[0136] Cationic polymers which are extraordinarily preferred according to the invention are selected from polyquaternium-2,2-[2-hydroxy-3-(trimethylammonio)propoxy]ethylcellulose ether chloride, amphoteric copolymers with a cationic net charge which consist of acrylamidopropyltrimethylammonium chloride and acrylic acid in a molar ratio of 60:40 to 95:5, preferably of 75:25 to 90:10, and terpolymers of acrylic acid, diallyldimethylammonium chloride and acrylamide, as well as mixtures of these polymers.

[0137] Furthermore, it has been found in the context of the investigations on the present invention that the process according to the invention is particularly suitable for colorant components (K1) which contain at least one anionic surfactant selected from alkyl sulfates and alkyl ether sulfates, each having 10 to 20 C atoms in the alkyl group and zero to 16, preferably 2 to 3, glycol ether groups in the molecule, preferably in a total amount of 0.01 to 5 wt.%, preferably 0.1 to 3 wt.%, particularly preferably 0.5 to 2 wt.%, extraordinarily preferably 0.7 to 1.3 wt.%, in each case based on the weight of component (K1).

[0138] Preferably, the at least one alkyl sulfate having 10 to 20 C atoms in the alkyl group and zero glycol ether groups in the molecule is selected from lauryl sulfate, myristyl sulfate, cetyl sulfate, stearyl sulfate and arachidyl sulfate as well as from mixtures of these alkyl sulfates, particularly preferably from cetyl sulfate, stearyl sulfate, arachidyl sulfate and cetyl sulfate / stearyl sulfate mixtures. The alkyl sulfates are monovalently negatively charged and are in salt form, preferably as alkali metal, alkaline earth metal, ammonium, alkylammonium, alkanolamine or glucammonium salt, particularly preferably as sodium, potassium, alkanolamine, in particular monoethanolamine, trialkylammonium, triethanolamine, 2-amino-1-butanol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-ethyl-1,3-propanediol and / or tris-(hydroxymethyl)aminomethane salt.According to the invention, the at least one alkyl sulfate having 10 to 20 C atoms in the alkyl group and zero glycol ether groups in the molecule is particularly preferably present in the form of the sodium, potassium, or magnesium salt. Extremely preferably, the at least one alkyl sulfate having 10 to 20 C atoms in the alkyl group and zero glycol ether groups in the molecule is selected from sodium lauryl sulfate, sodium myristyl sulfate, sodium cetyl sulfate, sodium stearyl sulfate, sodium arachidyl sulfate, potassium lauryl sulfate, potassium myristyl sulfate, potassium cetyl sulfate, potassium stearyl sulfate, potassium arachidyl sulfate, and mixtures of these alkyl sulfates. Furthermore, the at least one alkyl sulfate having 10 to 20 C atoms in the alkyl group and zero glycol ether groups in the molecule is extremely preferably selected from sodium cetyl sulfate, sodium stearyl sulfate, potassium cetyl sulfate, potassium stearyl sulfate and mixtures of these alkyl sulfates.

[0139] Preferably, the at least one alkyl ether sulfate having 10 to 20 C atoms in the alkyl group and 1 to 16 glycol ether groups in the molecule is selected from laureth sulfate, myristeth sulfate, ceteth sulfate, steareth sulfate, and arachideth sulfate, as well as mixtures of these alkyl ether sulfates. Particularly preferred is the at least one alkyl ether sulfate having 10 to 20 C atoms in the alkyl group and 1 to 16 glycol ether groups in the molecule, selected from ceteth sulfate, steareth sulfate, arachideth sulfate, and ceteth sulfate / steareth sulfate mixtures, with the alkyl ether sulfates particularly preferably having 2 to 3 glycol ether groups in the molecule.The alkyl ether sulfates are monovalently negatively charged and are in salt form, preferably as alkali metal, alkaline earth metal, ammonium, alkylammonium, alkanolamine or glucammonium salt, particularly preferably as sodium, potassium, alkanolamine, in particular monoethanolamine, trialkylammonium, triethanolamine, 2-amino-1-butanol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-ethyl-1,3-propanediol and / or tris-(hydroxymethyl)aminomethane salt.

[0140] According to the invention, the at least one alkyl ether sulfate having 10 to 20 C atoms in the alkyl group and 1 to 16, preferably 2 to 3, glycol ether groups in the molecule is particularly preferably present in the form of the sodium, potassium, or magnesium salt. Extremely preferably, the at least one alkyl ether sulfate having 10 to 20 C atoms in the alkyl group and 1 to 16, preferably 2 to 3, glycol ether groups in the molecule is selected from sodium laureth sulfate, sodium myristeth sulfate, sodium ceteth sulfate, sodium steareth sulfate, sodium arachideth sulfate, potassium laureth sulfate, potassium myristeth sulfate, potassium ceteth sulfate, potassium steareth sulfate, potassium arachideth sulfate, and mixtures of these alkyl ether sulfates.Further extraordinarily preferred is the at least one alkyl ether sulfate having 10 to 20 C atoms in the alkyl group and 1 to 16, preferably 2 to 3 glycol ether groups in the molecule selected from sodium laureth(2) sulfate, sodium laureth(3) sulfate, potassium laureth(2) sulfate and potassium laureth(3) sulfate and from mixtures of these alkyl ether sulfates.

[0141] A dyeing process which is extremely preferred according to the invention is characterized in that the first component (K1) contains the following ingredients: - ammonium hydroxide as the main alkalizing agent, that is to say ammonium hydroxide in an amount of at least 55% by weight, preferably at least 70% by weight, particularly preferably at least 80% by weight, extraordinarily preferably at least 90% by weight of the total amount of all alkalizing agents, in component (K1), furthermore - at least one fat component in a total amount of 0.5 to 70 wt.%, preferably 5 to 50 wt.%, particularly preferably 10 to 30 wt.%, extraordinarily preferably 15 to 25 wt.%, in each case based on the weight of component (K1), furthermore - at least one cationic polymer, preferably in a total amount of 0.01 to 5 wt. %, more preferably 0.05 to 2 wt. %, particularly preferably 0.1 to 1.5 wt. %, extraordinarily preferably 0.2 to 1 wt. %, in each case based on the weight of component (K1), particularly preferably selected from polyquaternium-2,2-[2-hydroxy-3-(trimethylammonio)-propoxy]ethylcellulose ether chloride, amphoteric copolymers with a cationic net charge, which consist of acrylamidopropyltrimethylammonium chloride and acrylic acid in a molar ratio of 60:40 to 95:5, preferably of 75:25 to 90:10, and terpolymers of acrylic acid, diallyldimethylammonium chloride and acrylamide, and mixtures of these polymers; furthermore - at least one anionic surfactant selected from alkyl sulfates and alkyl ether sulfates, each having 10 to 20 C atoms in the alkyl group and zero to 16, preferably 2 to 3, glycol ether groups in the molecule, preferably in a total amount of 0.01 to 5 wt.%, preferably 0.1 to 3 wt.%, particularly preferably 0.5 to 2 wt.%, extraordinarily preferably 0.7 to 1.3 wt.%, in each case based on the weight of component (K1).

[0142] The professional will select the amount of oxidizing agent depending on the desired lightening effect. If a very dark shade is desired, the professional will reduce the amount of hydrogen peroxide used accordingly. However, if a vibrant, fashionable shade is desired on dark hair, the hair must also be significantly lightened at the same time. In this case, the amount of hydrogen peroxide used will be increased accordingly.

[0143] In a further very particularly preferred embodiment, the process for dyeing human hair is characterized in that the second component (K2) - based on the weight of component (K2) - contains 1.5 to 18 wt.%, preferably 2.5 to 12 wt.%, more preferably 3 to 9 wt.% and extraordinarily preferably 5.5 to 6.5 wt.% hydrogen peroxide (calculated as 100% hydrogen peroxide).

[0144] In a further very particularly preferred embodiment, the process for dyeing human hair is characterized in that the third component (K3) - based on the weight of component (K3) - contains 1.5 to 18 wt.%, preferably 2.5 to 12 wt.%, more preferably 3 to 9 wt.% and extraordinarily preferably 5.5 to 6.5 wt.% hydrogen peroxide (calculated as 100% hydrogen peroxide).

[0145] In a further very particularly preferred embodiment, the process for dyeing human hair is characterized in that the second component (K2) and the third component (K3) independently of one another and in each case based on their weight, contain 1.5 to 18 wt.%, preferably 2.5 to 12 wt.%, more preferably 3 to 9 wt.% and extraordinarily preferably 5.5 to 6.5 wt.% hydrogen peroxide.

[0146] In the process according to the invention, components (K1) and (K2) are preferably mixed together in specific weight ratios. The first component (K1) and the second component (K2) are preferably mixed together in a weight ratio of 3:1 to 1:3, preferably 2:1 to 2:1, and most preferably 1:1.

[0147] In the process according to the invention, components (K1) and (K3) are preferably mixed together in specific weight ratios. The first component (K1) and the third component (K3) are preferably mixed together in a weight ratio of 3:1 to 1:3, preferably 2:1 to 2:1, and most preferably 1:1.

[0148] In principle, the weight ratios (K1):(K2) and (K1):(K3) are independent of each other. However, it may be preferable, primarily for reasons of user-friendliness, for the weight ratios (K1):(K2) and (K1):(K3) to be equal.

[0149] After application to the hair, the mixtures (M1) and (M2) are left to act on the hair in step E) for a period of 30 seconds to 60 minutes, preferably 20 to 45 minutes. According to the invention, it is possible to leave the mixture (M2) on all sections of the hair for a specific period of time, specifically at room temperature and / or at 30-60°C, preferably at 32-50°C. In a further embodiment, however, it is also possible to select different exposure times for specific hair length sections, so that, for example, the exposure time in the middle hair length region is longer than the exposure time in the tip region, by first rinsing the mixture (M2) only from the tips of the hair but leaving it on the middle hair length.

[0150] In a further particularly preferred embodiment, the method for dyeing human hair is characterized in that E1) the mixture (M2) is applied to the hair in the middle length range EXCLUDING the hair tips for a period of 30 seconds to 60 minutes, preferably 20 to 45 minutes, and E2) the mixture (M2) is applied to the hair in the area not yet treated in step E1), in particular the hair tips, for a period of 30 seconds to 60 minutes, preferably 20 to 45 minutes, wherein the exposure times of steps E1) and E2) differ by at least 5 minutes, preferably at least 10 minutes. Examples

[0151] The following formulations were prepared - all data are given in weight percent unless otherwise stated. 1. Dye preparation (first component (K1)) % by weight Polyacrylic acid ammonium salt (active ingredient) 0,075 Decyl oleate 2,1 Sodium cetearyl sulfate 1,3 Cetearyl alcohol 14,9 Glyceryl stearate 5,4 Linoleamidopropyl PG-dimonium chloride phosphate 0,05 EDTA 0,8 Monoethanolamine 0,4 Ammonia (25 wt.% aqueous solution) 8,0 Ascorbic acid 0,1 Sodium dithionite 0,1 L-Serine 0,3 Polyquaternium-2 0,1 p-Toluenediamine sulfate 0,8 Resorcin 0,2 m-Aminophenol 0,04 4-Chlororesorcinol 0,2 2-Amino-4-[(2-hydroxyethyl)amino]-anisole 0,02 Water to 100 2. Oxidizing agent composition (component (K2)) % by weight Sodium benzoate 0,04 Dipicolinic acid 0,1 Disodium pyrophosphate 0,1 Potassium hydroxide 0,1 1,2-Propanediol 1,0 Etidronic acid (1-hydroxyethane-1,1-diphosphonic acid) 0,15 Paraffinum Liquidum 0,3 Steartrimonium chloride 0,31 Cetearyl alcohol 3,4 Ceteareth-20 1,0 Isopropyl alcohol 0,07 hydrogen peroxide 6,1 Water to 100

[0152] Composition K2 has a pH of 3.28, measured at 22°C. 3. Oxidizing agent composition (component (K3-1)) % by weight Sodium benzoate 0,04 Dipicolinic acid 0,1 Disodium pyrophosphate 0,1 Potassium hydroxide 0,1 1,2-Propanediol 1,0 Etidronic acid (1-hydroxyethane-1,1-diphosphonic acid) 0,15 Paraffinum Liquidum 0,3 Steartrimonium chloride 0,31 Cetearyl alcohol 3,4 Ceteareth-20 1,0 Isopropyl alcohol 0,07 Phosphoric acid, 85% w / w 1,0 hydrogen peroxide 6,1 Water to 100

[0153] The composition K3-1 has a pH value of 1.4, measured at 22°C. 4. Oxidizing agent composition (component (K3-2)) % by weight Sodium benzoate 0,04 Dipicolinic acid 0,1 Disodium pyrophosphate 0,1 Potassium hydroxide 0,1 1,2-Propanediol 1,0 Etidronic acid (1-hydroxyethane-1,1-diphosphonic acid) 0,15 Paraffinum Liquidum 0,3 Steartrimonium chloride 0,31 Cetearyl alcohol 3,4 Ceteareth-20 1,0 Isopropyl alcohol 0,07 Lactic acid or tartaric acid or malic acid @ pH 1.4 hydrogen peroxide 6,1 Water to 100 5. Oxidizing agent composition (component (K3-3)) % by weight Sodium Cetearyl Sulfate 0,34 Cetearyl alcohol 3,5 PEG-40 Castor Oil 0,7 Potassium hydroxide 0,12 Sodium benzoate 0,04 Disodium pyrophosphate 0,1 Dipicolinic acid 0,1 Etidronic acid (1-hydroxyethane-1,1-diphosphonic acid) 0,19 Paraffinum Liquidum 17,0 Phosphoric acid or lactic acid or tartaric acid or malic acid @ pH 1.4 hydrogen peroxide 6,1 Water to 100 3. Application

[0154] First, the dye preparation (K1) was mixed with the oxidizing agent composition (K2) in a 1:1 weight ratio. This mixing process resulted in mixture (M1). This mixture was applied to the hair at the roots.

[0155] Then, the dyeing preparation (K1) was mixed with one of the oxidizing agent compositions (K3-1), (K3-2), or (K3-3) in a weight ratio of 1:1. The mixture (M2) was obtained.

[0156] For the 1:1 mixtures, the following pH values ​​were obtained (22°C) K1 (K1) + (K2) = (M1) (K1) + (K3-1) = (M2-1) (K1) + (K3-2) = (M2-2) (K1) + (K3-3) = (M2-3) PH value 10,44 10,05 9,79 9,77 9,78

Claims

[1] A method of dyeing human hair comprising the following steps in the order given A) mixing a first aliquot of a first component (K1) with a second component (K2) to obtain a first mixture (M1), B) Apply the mixture (M1) to selected areas of the hair, C) mixing a second aliquot of the first component (K1) with a third component (K3) to obtain a second mixture (M2), D) Apply the mixture (M2) to selected areas of the hair that have not been treated with (M1), E) Leave the mixtures (M1) and (M2) on the hair for a period of 30 seconds to 60 minutes at room temperature or at 30 - 60°C, F) Rinse the mixtures (M1) and (M2) from the hair, whereby - component (K1) is a water-based dyeing preparation containing at least one oxidation dye precursor and having a pH in the range from 8 to 11, measured at 22°C, - the second component (K2) is a water-containing hydrogen peroxide preparation which does not contain an oxidation dye precursor and has a pH in the range from 3 to 6.9, measured at 22°C, and - the third component (K3) is a water-containing hydrogen peroxide preparation which does not contain an oxidation dye precursor and has a pH in the range of 1.0 to 2.8, measured at 22°C, and - the pH of the mixture (M1) is at least 0.2 units lower than the pH of the component (K1) and - the pH of the mixture (M2) is at least 0.2 units lower than the pH of the mixture (M1), characterized by that the first component (K1) contains at least one cationic polymer. [2] Method according to claim 1, characterized by that the second component (K2) contains, in each case based on its weight, one or more fat components in a total amount of 0.1 to 70 wt.%. [3] Method according to claim 1 or 2, characterized by that the third component (K3) contains, in each case based on its weight, one or more fat components in a total amount of 0.1 to 70% by weight. [4] Method according to one of claims 1 to 3, characterized by that the third component (K3) contains at least one acid selected from the group consisting of lactic acid, citric acid, malic acid, tartaric acid, maleic acid, succinic acid, oxalic acid, ascorbic acid, sulfuric acid, hydrochloric acid and / or phosphoric acid. [5] Method according to one of claims 1 to 4, characterized by that the third component (K3) contains one or more acids in a total amount of 0.5 to 15.0 wt. %, based on the weight of component (K3). [6] Method according to one of claims 1 to 5, characterized by that the third component (K3) contains at least one acid selected from the group consisting of lactic acid, citric acid, malic acid, tartaric acid, maleic acid, succinic acid, oxalic acid, ascorbic acid, sulfuric acid, hydrochloric acid and / or phosphoric acid, in a total amount of 0.5 to 15.0 wt.%, based on the weight of component (K3). [7] Method according to one of claims 1 to 6, characterized by that the second component (K2) contains one or more non-ionic surfactants. [8] Method according to one of claims 1 to 7, characterized by that the third component (K3) contains one or more non-ionic surfactants. [9] Method according to one of claims 1 to 8, characterized bythat the first component (K1) contains at least one oxidation dye precursor selected from the group consisting of p-toluenediamine, 2-(2-hydroxyethyl)-p-phenylenediamine, N,N-bis-(2-hydroxyethyl)-p-phenylenediamine, 2-methoxymethyl-p-phenylenediamine, N-(4-amino-3-methylphenyl)-N-[3-(1H-imidazol-1-yl)propyl]amine, bis-(2-hydroxy-5-aminophenyl)methane, 4-aminophenol, 4-amino-3-methylphenol, 4,5-diamino-1-(2-hydroxyethyl)pyrazole, 2,4,5,6-tetraaminopyrimidine, 4-hydroxy-2,5,6-triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine and their physiologically acceptable salts. [10] Method according to one of claims 1 to 9, characterized by that the second component (K2) and the third component (K3) independently of one another and each based on their weight contain 1.5 to 18 wt.% hydrogen peroxide. [11] Method according to one of claims 1 to 10, characterized by that independently A) the first component (K1) and the second component (K2) are mixed together in a weight ratio of 3:1 to 1:3 and B) the first component (K1) and the third component (K3) are mixed together in a weight ratio of 3:1 to 1:

3. [12] Method according to one of claims 1 to 11, characterized by that the first component (K1) independently contains at least one cationic polymer selected from polyquaternium-2,2-[2-hydroxy-3-(trimethylammonio)propoxy]ethyl cellulose ether chloride, amphoteric copolymers with a cationic net charge consisting of acrylamidopropyltrimethylammonium chloride and acrylic acid in a molar ratio of 60:40 to 95:5, preferably of 75:25 to 90:10, and terpolymers of acrylic acid, diallyldimethylammonium chloride and acrylamide, and mixtures of these polymers. [13] Method according to one of claims 1 to 12, characterized bythat the first component (K1) contains the at least one cationic polymer in a total amount of 0.01 to 5 wt.%, based on the weight of component (K1).