<sup2 / >? <sub2 / >?1?method for dyeing keratinous fibers, involving a dyeing process using direct dyes and an aftertreatment using c-c <ns2:sub>6< / ns2:sub>?alkoxy silanes in a solvent system

Abstract

The invention relates to a method for dyeing keratinous fibers, in particular human hair, having the following steps in the specified order: (1) applying a dyeing agent (F) onto the keratinous fibers, said dyeing agent (F) containing: (F-1) one or more direct dyes, (2) working the dyeing agent (F) onto the keratinous fibers, (3) optionally rinsing out the dyeing agent (F), (4) applying an aftertreatment agent (N) onto the keratinous fibers, wherein the aftertreatment agent (N) contains – based on the total weight of the aftertreatment agent (N): (N-1) one or more organic C1-C6 alkoxy silanes and / or the condensation products thereof, (N-2) less than 25.0 wt.% of water, and (N-3) at least one solvent which differs from water, (5) working the aftertreatment agent (N) onto the keratinous fibers, and (6) optionally rinsing out the aftertreatment agent (N).

Description

[0001] Henkel AG & Co. KGaA 2023P00100WO Process for coloring keratin fibers, comprising coloring with direct dyes and aftertreatment with C1-C6-alkoxysilanes in a solvent system. The present application relates to a process for coloring keratin fibers, in particular human hair, in which a colorant (F) and an aftertreatment agent (N) are applied to the keratin fibers. The colorant (F) contains at least one direct dye, and the aftertreatment agent (N) is low in water, contains at least one C1-C6-alkoxysilane, and at least one solvent. Changing the shape and color of keratin fibers, in particular human hair, represents an important area of ​​modern cosmetics. Depending on the coloring requirements, the skilled person is familiar with various coloring systems for changing hair color. For permanent,For intensive dyeings with good fastness properties and good gray coverage, oxidation dyes are usually used. Such dyes contain oxidation dye precursors, so-called developer components and coupler components.which, under the influence of oxidizing agents such as hydrogen peroxide, form the actual dyes. Oxidation dyes are characterized by very long-lasting coloring results. When using direct dyes, already fully formed dyes diffuse from the dye into the hair fiber. Compared to oxidative hair coloring, the colors obtained with direct dyes are less durable and wash out more quickly. Colorations with direct dyes usually remain on the hair for a period of between 5 and 20 washes. Therefore, there is still room for improvement regarding the fastness properties of colorations produced with direct dyes. FR 3081102 A1 describes a coloring process in which hair is first colored with a colorant containing at least one anionic,substantive dye. Following this dyeing step, another agent containing two different organosilanes is applied to the hair. This two-step process is intended to produce dyes with good fastness properties on hair. Although the dyeing processes described in FR 3081102 A1 are said to have good performance properties, the washfastness of the dyes produced using these processes still requires further optimization. The object of the present invention was to find a dyeing process based on substantive dyes that produces dyes with improved washfastness and improved leveling power. Surprisingly, it has now been found that this further improvement in fastness properties is possible when hair dyed with a substantive dye is treated with a post-treatment agent.which contains one or more organic C1-C6 alkoxy silanes in a special, low-water and solvent-based carrier system. A first aspect of the present invention is a method for dyeing keratinic fibers, in particular human hair, comprising the following steps in the specified order: (1) applying a dye (F) to the keratinic fibers, wherein the dye (F) contains: (F-1) one or more direct dyes, (2) allowing the dye (F) to act on the keratinic fibers, (3) optionally rinsing the dye (F), (4) applying a post-treatment agent (N) to the keratinic fibers, wherein the post-treatment agent (N) contains - based on the total weight of the post-treatment agent (N): (N-1) one or more organic C1-C6-alkoxysilanes and / or their condensation products, (N-2) less than 25.0 wt.% water, and (N-3) at least one solvent other than water,(5) allowing the aftertreatment agent (N) to act on the keratin fibers, and (6) optionally rinsing out the aftertreatment agent (N). Keratin fibers Keratin fibers are understood to mean hair, wool, and fur. Most preferably, keratin fibers are understood to mean human hair. Application of the colorant (F) in step (1) In step (1) of the process according to the invention, the colorant (F) is applied to the keratin fibers or hair. The colorant (F) contains at least one direct dye (F-1). These are dyes that are absorbed directly onto the hair and do not require an oxidative process to develop the color. Direct dyes are usually nitrophenylenediamines, nitroaminophenols, azo dyes, anthraquinones,Triarylmethane dyes or indophenols. The direct dyes according to the present invention have a solubility in water (760 mmHg) at 25°C of more than 0.5 g / L and are therefore not considered pigments. Preferably, the direct dyes according to the present invention have a solubility in water (760 mmHg) at 25°C of more than 1.0 g / L. The water solubility of the direct dyes can be determined, for example, in the following way: 0.1 g of the direct dye is placed in a beaker. A stir bar is added. Then, 100 ml of water is added. This mixture is heated to 25°C on a magnetic stirrer while stirring. It is stirred for 60 minutes. The aqueous mixture is then visually assessed. If undissolved residues are still present, the amount of water is increased—for example, in 10 ml increments. Water is added untiluntil the used amount of dye has completely dissolved. If the dye-water mixture cannot be visually assessed due to the high intensity of the dye, the mixture is filtered. If a portion of undissolved dye remains on the filter paper, the solubility test is repeated with a higher amount of water. If 0.1 g of the anionic substantive dye dissolves in 100 ml of water at 25 °C, the solubility of the dye is 1.0 g / L. Substantive dyes can be divided into cationic, anionic, and non-ionic substantive dyes. When used in the process according to the invention, good color results with outstanding fastness properties could be achieved, particularly with cationic dyes (F-1). In one embodiment, the process according to the invention is characterized in that the colorant (F) comprises at least one substantive dye (F-1) from the group of cationic,anionic and / or non-ionic direct dyes, particularly preferably from the group of cationic direct dyes. Preferred cationic direct dyes are Basic Blue 7, Basic Blue 26, Basic Violet 2 and Basic Violet 14, Basic Yellow 57, Basic Red 76, Basic Blue 16, Basic Blue 347 (Cationic Blue 347 / Dystar), HC Blue No. 16, Basic Blue 99, Basic Brown 16, Basic Brown 17, Yellow 87, Basic Orange 31 and Basic Red 51. Within the scope of a further particularly preferred embodiment, a process according to the invention is characterized in that the colorant (F) contains at least one cationic direct dye (F-1) which is selected from the group consisting of Basic Blue 7, Basic Blue 26, Basic Violet 2 and Basic Violet 14, Basic Yellow 57, Basic Red 76, Basic Blue 16, Basic Blue 347 (Cationic Blue 347 / Dystar), HC Blue No. 16, Basic Blue 99, Basic Brown 16, Basic Brown 17, Yellow 87,Basic Orange 31 and Basic Red 51. Suitable anionic direct dyes are the compounds known by the international or trade names Bromophenol Blue, Tetrabromophenol Blue, 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, and Acid Black 52. Suitable nonionic direct dyes include nonionic nitro and quinone dyes and neutral azo dyes. Well-suited non-ionic direct dyes are the compounds known under the international names or trade names 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 10, HC Red 11, HC Red 13, HC Red BN, HC Blue 2, HC Blue 11, HC Blue 12, Disperse Blue 3, HC Violet 1, Disperse Violet 1, Disperse Violet 4, Disperse Black 9, as well as 1,4-diamino-2-nitrobenzene,2-amino-4-nitrophenol, 1,4-bis-(2-hydroxyethyl)-amino-2-nitrobenzene, 3-nitro-4-(2-hydroxyethyl)-aminophenol, 2-(2-hydroxyethyl)amino-4,6-dinitrophenol, 4-[(2-hydroxyethyl)amino]-3-nitro-1-methylbenzene, 1-Amino-4-(2-hydroxyethyl)-amino-5-chloro-2-nitrobenzene, 4-amino-3-nitrophenol, 1-(2'-ureidoethyl)amino-4-nitrobenzene, 2-[(4-amino-2-nitrophenyl)amino]-benzoic acid, 6-nitro-1,2,3,4-tetrahydroquinoxaline, 2-Hydroxy-1,4-naphthoquinone, picramic acid and its salts, 2-Amino-6-chloro-4-nitrophenol, 4-ethylamino-3-nitrobenzoic acid, and 2-chloro-6-ethylamino-4-nitrophenol. The direct dye(s), especially the cationic direct dye(s), can be used in the dyeing agent (F) in various amounts depending on the desired color intensity. Particularly good results have been obtained when the dyeing agent (F) contains one or more direct dye(s) in a total amount of 0.01 to 10%, based on the total weight of the dyeing agent (F).0 wt.%, preferably from 0.05 to 8.0 wt.%, more preferably from 0.1 to 6.0 wt.%, and most preferably from 0.15 to 4.5 wt.%. In a further preferred embodiment, a process according to the invention is characterized in that the colorant (F) - based on the total weight of the colorant (F) - contains one or more direct dyes in a total amount of 0.01 to 10.0 wt.%, preferably from 0.05 to 8.0 wt.%, more preferably from 0.1 to 6.0 wt.%, and most preferably from 0.15 to 4.5 wt.%. The colorant (F) can be applied to moistened or dry keratin fibers. The application can be carried out, for example, with the aid of a brush, a brush, or a nozzle.or the user can use their gloved hand for this purpose. In addition to the direct dye(s) (F-1), the colorant (F) can optionally also contain further ingredients. Thus, the colorant (F) can also contain further active ingredients, auxiliaries, and additives, such as cationic, non-ionic, amphoteric, zwitterionic, and / or anionic surfactants; thickening polymers, film-forming polymers; structuring agents such as glucose, maleic acid, and lactic acid; hair conditioning compounds such as phospholipids, for example lecithin and cephalins; perfume oils, dimethyl isosorbide, and cyclodextrins; fiber structure-improving agents, in particular mono-, di-, and oligosaccharides such as glucose, galactose, fructose, fructose, and lactose; dyes for coloring the product; anti-dandruff agents such as piroctone olamine,Zinc omadine and climbazole; amino acids and oligopeptides; protein hydrolysates of animal and / or plant origin, as well as in the form of their fatty acid condensation products or, where appropriate, anionically or cationically modified derivatives; sunscreens and UV blockers; active ingredients such as panthenol, pantothenic acid, pantolactone, allantoin, pyrrolidinone carboxylic acids and their salts and bisabolol; polyphenols, in particular hydroxycinnamic acids, 6,7-dihydroxycoumarins, hydroxybenzoic acids, catechins, tannins, leucoanthocyanidins, anthocyanidins, flavanones, flavones and flavonols; ceramides or pseudoceramides; vitamins, provitamins and vitamin precursors; plant extracts; fats and waxes such as fatty alcohols, beeswax, montan wax and paraffins; Swelling and penetrating agents such as glycerol, propylene glycol monoethyl ether, carbonates, hydrogen carbonates, guanidines, ureas as well as primary, secondary and tertiary phosphates; opacifiers such as latex,Styrene / PVP and styrene / acrylamide copolymers; pearlescent agents such as ethylene glycol mono- and distearate and PEG-3 distearate; and propellants such as propane-butane mixtures, N2O, dimethyl ether, CO2, and air. The selection of these additional substances will be made by the person skilled in the art according to the desired properties of the agent. Regarding further optional components and the amounts of these components used, reference is expressly made to the relevant manuals known to the person skilled in the art. The additional active ingredients and auxiliaries are preferably used in the preparations according to the invention in amounts of 0.0001 to 25 wt.%, in particular 0.0005 to 15 wt.%, based on the total weight of the respective agent. Exposure of the colorant (F) in step (2) In step (2) of the process according to the invention, the colorant (F) is allowed to act on the keratin fibers or hair. Typical exposure times are, for example, 1 minute to 60 minutes,preferably 5 minutes to 45 minutes. During the exposure time of the dye (F) to the fibers, it may be advantageous to support the dyeing process by applying heat. The heat can be supplied by an external heat source, such as warm air from a warm-air blower, or, particularly when dyeing hair on a live test subject, by the subject's body temperature. In the latter case, the area to be dyed is usually covered with a hood. In particular, the temperature during the exposure time is between 10 °C and 45 °C.in particular between 20°C and 40°C. Rinsing out the colorant (F) in step (3) In step (3) of the process, the colorant (F) can be rinsed out. The rinsing step is optional and, in one embodiment, can be carried out, for example, with water or with water with the aid of a shampoo. The colorant (F) is preferably rinsed out after the action in step (3). Therefore, a method for dyeing keratin fibers, in particular human hair, is preferred, comprising the following steps in the given order: (1) applying a dye (F) to the keratin fibers, wherein the dye (F) contains: (F-1) one or more direct dyes, (2) allowing the dye (F) to act on the keratin fibers, (3) rinsing out the dye (F), (4) applying a post-treatment agent (N) to the keratin fibers,wherein the aftertreatment agent (N) contains, based on the total weight of the aftertreatment agent (N): (N-1) one or more organic C1-C6 alkoxysilanes and / or their condensation products, (N-2) less than 25.0 wt.% water, and (N-3) at least one solvent other than water, (5) exposure of the aftertreatment agent (N) to the keratin fibers, and (6) optionally rinsing out the aftertreatment agent (N). Within the scope of a further particularly preferred embodiment, the process according to the invention is characterized by (2) exposure of the colorant (F) to the keratin fibers for a period of 2 to 60 minutes, preferably 5 to 45 minutes, and particularly preferably 5 to 30 minutes, and (3) rinsing out the colorant (F). Applying the after-treatment agent (N) in step (4) If the dye (F) is not rinsed out,then, the application of the aftertreatment agent (N) takes place in step (4) following step (2). Within the scope of this embodiment, the aftertreatment agent (N) is then applied to the hair still covered with the colorant. However, it is preferred if the colorant (F) is rinsed out before applying the aftertreatment agent (N). If the colorant (F) is rinsed out, the aftertreatment agent is applied to the keratin fibers in step (4) following step (3). The application can take place on the hair that is still damp or towel-dried after rinsing, or the keratin fibers are dried between steps (3) and (4). Within the scope of a further embodiment, a method according to the invention is therefore characterized by (4) applying an aftertreatment agent (N) to towel-dried or dried keratin fibers. Particularly durable colorations have been obtainedwhen the after-treatment product (N) has been applied to damp or towel-dried hair. Since the after-treatment product (N) itself contains little or no water, the amount of water still present in the hair supports the condensation of the organic C1-C6 alkoxysilanes directly on the surface of the keratin. This creates a particularly uniform and resistant coating that tightly envelops the hair fiber and forms directly where the film is intended. Dampened or towel-dried hair refers to hair that has been completely wetted with water at the sink or in the shower, then squeezed out and rubbed dry with a towel (e.g., for 30 seconds). Dampened or towel-dried hair is therefore no longer dripping wet,but still moist. In another particularly preferred embodiment, the method according to the invention is characterized by (4) applying the aftertreatment agent (N) to still moist or towel-dried keratin fibers. For the keratin fibers that are still moist or towel-dried shortly before application of the aftertreatment agent (N), the colorant (F) is washed out a maximum of 30 minutes, preferably a maximum of 10 minutes, before application of the aftertreatment agent (N). The aftertreatment agent (N) is characterized in that it contains - based on its total weight - (N-1) one or more organic C1-C6-alkoxysilanes and / or their condensation products, and (N-2) less than 25.0 wt.% water,and (N-3) at least one solvent other than water. The organic C1-C6 alkoxysilane(s) (N-1) are therefore present in the aftertreatment agent (N) in a solvent-containing carrier and in a water-poor environment. As the first substance class essential to the invention, the aftertreatment agent (N) contains one or more organic C1-C6 alkoxysilanes (N-1) and / or their condensation products. The organic C1-C6 alkoxysilanes (N-1) are reactive compounds. Organic silicon compounds, alternatively also referred to as organosilicon compounds, are compounds that either have a direct silicon-carbon bond (Si-C) or in which the carbon is linked to the silicon atom via an oxygen, nitrogen, or sulfur atom. The organic C1-C6 alkoxysilanes according to the invention are compoundswhich contain one to three silicon atoms. The organic C1-C6-alkoxysilanes particularly preferably contain one or two silicon atoms. According to IUPAC rules, the term silane refers to a group of chemical compounds based on a silicon backbone and hydrogen. In organic silanes, the hydrogen atoms are completely or partially replaced by organic groups such as (substituted) alkyl groups and / or alkoxy groups. In the organic silanes, some of the hydrogen atoms can also be replaced by hydroxyl groups. Organic C1-C6-alkoxysilanes comprising at least one C1-C6 alkoxy group,which is directly bonded to the silicon atom. The alkoxy group is reactive and can first be hydrolyzed in the presence of water and subsequently condensed with another organic C1-C6-alkoxysilane (or its hydrolysis product). The C1-C6-alkoxy group is preferably an ethoxy group or a methoxy group. If, for example, the hydrolyzable group is an ethoxy group, the organic silicon compound preferably contains a structural unit R'R''R'''Si-O-CH2-CH3. The radicals R', R'', and R''' represent the three remaining free valences of the silicon atom. Particularly good results were obtained when the aftertreatment agent (N) according to the invention contained at least one first organic C1-C6-alkoxysilane (N-1) of the formula (I). In a particularly preferred embodiment, a process according to the invention is characterized in thatthat the aftertreatment agent (N) contains at least one organic C1, -C 6 -Alkoxy- Contains silane (N-1) of formula (I) and / or its condensation products, R1R2N-L-Si(OR3) a (R4) b (I), where - R1, R2 independently represent a hydrogen atom or a C1-C6 alkyl group, - L represents a linear or branched, divalent C1-C 20-alkylene group, - R3 represents a hydrogen atom or a C1-C6 alkyl group, - R4 represents a C1-C6 alkyl group, - a, represents an integer from 1 to 3, and - b represents the integer 3 - a. The substituents R1, R2, R3, R4 and L, in the compounds of formula (I) are exemplified below: Examples of a C1-C6 alkyl group are the groups methyl, ethyl, propyl, isopropyl, n-butyl, s-butyl and t-butyl, n-pentyl and n-hexyl. Propyl, ethyl and methyl are preferred alkyl radicals. Examples of a C2-C6 alkenyl group are vinyl, allyl, but-2-enyl, but-3-enyl and isobutenyl, preferred C2-C6 alkenyl radicals are vinyl and allyl. Preferred examples of a hydroxy-C1-C6-alkyl group are a hydroxymethyl, a 2-hydroxyethyl, a 2-hydroxypropyl, a 3-hydroxypropyl, a 4-hydroxybutyl group, a 5-hydroxypentyl and a 6-hydroxyhexyl group; a 2-hydroxyethyl group is particularly preferred.Examples of an amino-C1-C6-alkyl group are the aminomethyl group, the 2-aminoethyl group, and the 3-aminopropyl group. The 2-aminoethyl group is particularly preferred. Examples of a linear divalent C1-C20-alkylene group are, for example, the methylene group (-CH2-), the ethylene group (-CH2-CH2-), the propylene group (-CH2-CH2-CH2-), and the butylene group (-CH2-CH2-CH2-CH2-). The propylene group (-CH2-CH2-CH2-) is particularly preferred. With a chain length of 3 carbon atoms or more, divalent alkylene groups can also be branched. Examples of branched, divalent C3-C20-alkylene groups are (-CH2-CH(CH3)-) and (-CH2-CH(CH3)-CH2-). In the organic silicon compounds of formula (I) R1R2N-L-Si(OR3). a (R4) b(I), the radicals R1 and R2 independently of one another represent a hydrogen atom or a C1-C6 alkyl group. Most preferably, the radicals R1 and R2 both represent a hydrogen atom. In the middle part of the organic silicon compound is the structural unit or the linker -L-, which represents a linear or branched, divalent C1-C20 alkylene group. Preferably, -L- represents a linear, divalent C1-C 20 -Alkylene group. More preferably, -L- represents a linear divalent C1-C6-alkylene group. More preferably, -L- represents a methylene group (-CH2-), an ethylene group (-CH2-CH2-), a propylene group (-CH2-CH2-CH2-) or a butylene group (-CH2-CH2-CH2-CH2-). Most preferably, L represents a propylene group (-CH2-CH2-CH2-). The inventive organic silicon compounds of the formula (I) R1R2N-L-Si(OR3)a(R4)b (I) each carry the silicon-containing group -Si(OR3) at one end. a (R4) b.In the terminal structural unit -Si(OR3)a(R4)b, the radical R3 represents a hydrogen atom or a C1-C6 alkyl group, and the radical R4 represents a C1-C6 alkyl group. Particularly preferably, R3 and R4 independently represent a methyl group or an ethyl group. Here, a represents an integer from 1 to 3, and b represents the integer 3 - a. If a represents the number 3, then b is 0. If a represents the number 2, then b is 1. If a represents the number 1, then b is 2. Dyes with the best washfastness properties could be obtained when the agent according to the invention contains at least one first organic silicon compound (a1) of the formula (I) in which the radicals R3 and R4 independently represent a methyl group or an ethyl group.Furthermore, dyeings with the best washfastness properties could be obtained when the agent according to the invention contains at least one first organic silicon compound of the formula (I), in which the radical a stands for the number 3. In this case, the radical b stands for the number 0. In a further preferred embodiment, an agent according to the invention is characterized in that it contains at least one first organic silicon compound (a1) of the formula (I), where - R3 stands for a hydrogen atom, a methyl group or an ethyl group, and - R4 stands for a methyl group or an ethyl group, and - a stands for the number 3 and - b stands for the number 0. In a further preferred embodiment, an aftertreatment agent (N) according to the invention is characterized in that it contains at least one first organic silicon compound (N-1) of the formula (I), R1R2N-L-Si(OR3). a (R4) b(I), where - R1, R2 both represent a hydrogen atom, and - L represents a linear, divalent C1-C6 alkylene group, preferably a propylene group (-CH2-CH2-CH2-) or an ethylene group (-CH2-CH2-), - R3 represents a hydrogen atom, a methyl group or an ethyl group, - R4 represents a methyl group or an ethyl group, and - a represents the number 3 and - b represents the number 0. Organic silicon compounds of the formula (I) that are particularly suitable for solving the problem according to the invention are - (3-aminopropyl)triethoxysilane - (3-Aminopropyl)trimethoxysilane - (2-Aminoethyl)triethoxysilane - (2-Aminoethyl)trimethoxysilane - (3-Dimethylaminopropyl)triethoxysilane - (3-Dimethylaminopropyl)trimethoxysilane -1-(3-Dimethylaminopropyl)silanetriol - (2-Dimethylaminoethyl)triethoxysilane. -1-(2-Dimethylaminoethyl)silanetriol In a further preferred embodiment, a process according to the invention is characterized in that the colorant (F) contains one or more organic C1-C6-alkoxysilanes (N-1) from the group consisting of (3-aminopropyl)triethoxysilane, (3-aminopropyl)trimethoxysilane, 1-(3-aminopropyl)silanetriol, (2-aminoethyl)triethoxysilane, (2-aminoethyl)trimethoxysilane, 1-(2-aminoethyl)silanetriol, (3-dimethylaminopropyl)triethoxysilane, (3-dimethylaminopropyl)trimethoxysilane, 1-(3-dimethylaminopropyl)silanetriol, (2-dimethylaminoethyl)triethoxysilane, (2-dimethylaminoethyl)trimethoxysilane, and / or their condensation products. The aforementioned organic C1-C6-alkoxysilanes of the formula (I) are commercially available. (3-Aminopropyl)trimethoxysilane, for example, can be purchased from Sigma-Aldrich. (3-Aminopropyl)triethoxysilane is also commercially available from Sigma-Aldrich.In order to particularly improve the wash fastness, it has been found to be particularly advantageous if the aftertreatment agent (N) according to the invention contains, in addition to or alternatively to the organic C1-C6-alkoxysilanes of the formula (I), at least one organic C1-C6-alkoxysilane of the formula (II) R5Si(OR6). k (R7) m (II). The organic C1-C6 alkoxysilane(s) of formula (II) can also be referred to as silanes of the alkylalkoxysilane or alkylhydroxysilane type, R5Si(OR6) k (R7) m (II), where - R5 represents a C1-C 12-alkyl group, - R6 represents a hydrogen atom or a C1-C6 alkyl group, - R7 represents a C1-C6 alkyl group, - k represents an integer from 1 to 3, and - m represents the integer 3 - k. In a further preferred embodiment, a process according to the invention is characterized in that the aftertreatment agent (N) contains at least one organic C1-C6 alkoxy silane (F1) of the formula (II): R5Si(OR6)k(R7)m (II), where - R5 represents a C1-C12 alkyl group, - R6 represents a hydrogen atom or a C1-C6 alkyl group, - R7 represents a C1-C6 alkyl group, - k represents an integer from 1 to 3, and - m represents the integer 3 - k. In a further preferred embodiment, an aftertreatment agent (N) used in the process according to the invention is characterized in that, in addition to the organic C1-C6-alkoxysilane(s) of the formula (I), it contains at least one further organic C1-C6-alkoxysilane of the formula (II) R5Si(OR6)k (R7) m (II), where - R5 represents a C1-C 12 -alkyl group, - R6 represents a hydrogen atom or a C1-C6-alkyl group, - R7 represents a C1-C6-alkyl group, - k represents an integer from 1 to 3, and - m represents the integer 3 – k. In the organic C1-C6-alkoxysilanes of the formula (II), the radical R5 represents a C1-C 12- Alkyl group. This C1-C12 alkyl group is saturated and can be linear or branched. R5 is preferably a linear C1-C8 alkyl group. R5 is preferably a methyl group, an ethyl group, an n-propyl group, an n-butyl group, an n-pentyl group, an n-hexyl group, an n-octyl group, or an n-dodecyl group. R5 is particularly preferably a methyl group, an ethyl group, or an n-octyl group. In the organic silicon compounds of the form (II), the radical R6 is a hydrogen atom or a C1-C6 alkyl group. R6 is particularly preferably a methyl group or an ethyl group. In the organic silicon compounds of the form (II), the radical R7 is a C1-C6 alkyl group. R7 is particularly preferably a methyl group or an ethyl group. Furthermore, k represents an integer from 1 to 3, and m represents the integer 3 – k. If k represents the number 3, then m is 0. If k represents the number 2, then m is 1.If k stands for the number 1, then m is equal to 2. Dyes with the best wash fastness properties could be obtained when a dyeing agent (F) was used in the process which contains at least one organic C1-C6 alkoxysilane of the formula (II), in which the radical k stands for the number 3. In this case, the radical m stands for the number 0. Organic silicon compounds of the formula (II) which are particularly suitable for solving the problem according to the invention are - methyltrimethoxysilane. - Methyltriethoxysilane - Ethyltriethoxysilane - n-Hexyltriethoxysilane - n-Octyltriethoxysilane - n-dodecyltriethoxysilane. In a further preferred embodiment, a process according to the invention is characterized in that the aftertreatment agent (N) contains one or more organic C1-C6-alkoxysilanes (N-1) from the group consisting of methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, octyltrimethoxysilane, octyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane, and / or their condensation products. Other organic silicon compounds particularly suitable for achieving the object of the invention are also - vinyltrimethoxysilane and - vinyltriethoxysilane.In an explicitly particularly preferred embodiment, an aftertreatment agent (N) according to the invention is characterized in that it contains at least one first organic C1-C6-alkoxysilane of the formula (I), which is selected from the group consisting of (3-aminopropyl)triethoxysilane and (3-aminopropyl)trimethoxysilane, and additionally contains at least one second organic C1-C6-alkoxysilane of the formula (II), which is selected from the group consisting of methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, hexyltrimethoxysilane, and hexyltriethoxysilane. The organic C1-C6-alkoxysilanes described above are reactive compounds. To achieve particularly good dyeing results, it is particularly advantageous to use the organic C1-C6-alkoxysilanes of the formula (I) and / or (II) in certain quantitative ranges in the dyeing agent (F).In this context, it has been found to be preferred if the aftertreatment agent (N) according to the invention - based on the total weight of the agent - contains one or more organic C1-C6-alkoxysilanes (N-1) and / or their condensation products in a total amount of 0.1 to 30.0 wt.%, preferably of 0.5 to 20.0 wt.%, more preferably of 5.0 to 15.0 wt.% and very particularly preferably of 6.0 to 12.5 wt.%. Within the scope of a further very particularly preferred embodiment, a process according to the invention is therefore characterized in that the aftertreatment agent (N) - based on the total weight of the aftertreatment agent (N) - contains one or more organic C1-C6-alkoxysilanes (N-1) and / or their condensation products in a total amount of 0.1 to 30.0 wt.%, preferably of 0.5 to 20.0 wt.%, more preferably of 5.0 to 15.0 wt.% and very particularly preferably of 6.0 to 12.5 wt.%.The organic C1-C6 alkoxysilanes (N-1) according to the invention, in particular those of formula (I) and / or (II), are reactive compounds that can undergo hydrolysis and condensation reactions with water. The reaction of the organic C1-C6 alkoxysilanes with water can occur in various ways. The reaction starts as soon as the C1-C6 alkoxysilanes come into contact with water by mixing. As soon as the C1-C6 alkoxysilanes and water come into contact, an exothermic hydrolysis reaction takes place according to the following scheme (reaction scheme using 3-aminopropyltriethoxysilane as an example): Depending on the number of hydrolyzable C1-C6 alkoxy groups per silane molecule, the hydrolysis reaction can also take place multiple times per C1-C6 alkoxy silane used: Hydrolysis using the example of methyltrimethoxysilane: OMe OMe CH 3Si OMe + H 2 O CH3 Si OH + MeOHOMe OMe Depending on the amount of water used, the hydrolysis reaction can also take place several times per C1-C6 alkoxy silane used: OMe OH CH 3Si OMe + 2 H 2 O CH3 Si OH + 2 MeOH OMe OMe or OMe OH CH 3Si OMe + 3 H 2 O CH3 Si OH + 3 MeOH OMe OH Following the hydrolysis, or almost simultaneously with the hydrolysis, a condensation of the partially (or partially completely) hydrolyzed C1-C6 alkoxy silanes takes place. The precondensation can, for example, proceed according to the following scheme: OH OH OMe OH H3C Si OMe + H3C SiOMe MeO Si O SiOMe + MeOHOMe OMe CH3CH3. Both partially hydrolyzed and fully hydrolyzed C1-C6 alkoxysilanes can participate in the condensation reaction, undergoing condensation with unreacted, partially, or fully hydrolyzed C1-C6 alkoxysilanes. Possible condensation reactions include (shown using the mixture of (3-aminopropyl)triethoxysilane and methyltrimethoxysilane): and / or and / or In the above exemplary reaction schemes, the condensation to form a dimer is shown in each case, but more extensive condensations to form oligomers with several silane atoms are also possible and also preferred. This hydrolysis or condensation reaction begins even in the presence of very small amounts of water, therefore the oligomers and / or condensation products of the aforementioned organic silicon compounds are also encompassed by this invention. A further characteristic feature of the aftertreatment agent (N) is its water content (N-2), which must be below 25 wt.%. Based on its total weight, the aftertreatment agent (N) therefore contains less than 25.0 wt.% water. The low water content in the aftertreatment agent (N) ensures the storage stability of the aftertreatment agent (N) and also ensures that the organic C1-C6 alkoxysilanes are still in reactive form and have not yet fully polymerized.If the complete crosslinking of the organic C1-C6 alkoxysilanes only takes place after the application of the aftertreatment agent (N) to the keratin fibers, the film formed during crosslinking is characterized by particularly high robustness and resistance. Robust films are obtained even if the aftertreatment agent (N) contains less than 25.0 wt.% water. It has proven preferable if the water content in the aftertreatment agent (N) is reduced even further. Particularly preferably, the aftertreatment agent (N) is formulated with such a low water content that the water content of the aftertreatment agent (N) - based on the total weight of the aftertreatment agent (N) - is in the range from 0 to 20.0 wt.%, preferably from 0.1 to 10.0 wt.%, more preferably from 0.1 to 5.0 wt.%, and particularly preferably from 0.5 to 3.0 wt.% water (F3).Within the scope of a further particularly preferred embodiment, a process according to the invention is characterized in that the aftertreatment agent (N) - based on the total weight of the aftertreatment agent (N) - contains 0 to 20.0 wt. %, preferably from 0.1 to 10.0 wt. %, more preferably from 0.1 to 5.0 wt. %, and particularly preferably from 0.5 to 3.0 wt. % water (N-2). As a third constituent essential to the invention, the aftertreatment agent (N) contains at least one solvent (N-3) other than water. A solvent is a fixed term and is used in chemistry for a substance that is liquid at room temperature (20 °C) and that is capable of dissolving other chemical substances. The solvent(s) (N-3) lower the polarity of the aftertreatment agent compared to water, prevent premature polymerization orFilm formation of the organic C1-C6 alkoxysilanes (N-1) and simultaneously increase the storage stability of the aftertreatment agent (N). Since the aftertreatment agent (N) is formulated with low water content, the solvent (N-3) preferably forms the cosmetic carrier—either together with the small amounts of water or alone—and thus preferably represents the main component of the aftertreatment agent (N). Suitable solvents include, for example, compounds from the group consisting of ethanol, isopropanol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, dipropylene glycol, diethylene glycol monoethyl ether, glycerin, phenoxyethanol, benzyl alcohol, poly-C1-C6 alkylene glycols, dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, butylene carbonate, and glycerol carbonate.Within the scope of a further particularly preferred embodiment, a process according to the invention is characterized in that the aftertreatment agent (N) contains at least one solvent (N-3) other than water, which is selected from the group consisting of ethanol, isopropanol, 1,2-propylene glycol, 1,3-propylene glycol, ethylene glycol, 1,2-butylene glycol, dipropylene glycol, diethylene glycol monoethyl ether, glycerol, phenoxyethanol, benzyl alcohol, poly-C1-C6-alkylene glycols, dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, butylene carbonate and glycerol carbonate, preferably from the group consisting of ethanol and isopropanol, particularly preferably ethanol. Within the scope of a further explicitly very particularly preferred embodiment, a process according to the invention is characterized in that the aftertreatment agent (N) contains at least one solvent (F4) other than water, which is selected from the group consisting of ethanol and isopropanol. Ethanol has the CAS No.64-17-5. Isopropanol is also alternatively called 2-propanol and has the CAS number 67-63-0. 1,2-Propylene glycol is also alternatively called 1,2-propanediol and has the CAS numbers 57-55-6 [(RS)-1,2-dihydroxypropane], 4254-14-2 [(R)-1,2-dihydroxypropane] and 4254-153 [(S)-1,2-dihydroxypropane]. 1,3-Propylene glycol is also alternatively called 1,3-dihydroxypropane or 1,3-propanediol and has the CAS number 504-63-2. Ethylene glycol is alternatively known as 1,2-ethanediol and has the CAS number 107-21-1. 1,2-Butylene glycol can also be known as 1,2-butanediol and has the CAS numbers 584-03-2 (racemate), 40348-66-1 ((R)-enantiomer) and 73522-17-5 ((S)-enantiomer). The dipropylene glycols (or oxydipropanols) form a group of substances derived from the glycol ether. The group of dipropylene glycols includes 1-oxydi-1-propanol with the CAS number 108-61-2, 2-oxydi-2-propanol with the CAS number 110-98-5 and 2-(2-hydroxypropoxy)-1-propanol with the CAS number.106-62-7. The mixture of these three isomers has the CAS No. 25265-71-8. Diethylene glycol monoethyl ether can also be referred to as ethoxydiglycol, ethyldiglycol, or 2-(2-ethoxyethoxy)ethanol and has the CAS No. 111-90-0. Glycerin is also referred to as 1,2,3-propanetriol and has the CAS No. 56-81-5. Phenoxyethanol has the CAS No. 122-99-6. Benzyl alcohol can also be referred to as phenylmethanol and has the CAS No. 100-51-6. Suitable poly-C1-C6-alkylene glycols include, in particular, polyethylene glycols, as described, for example, by the formula (AG). (AG), where x is an integer from 1 to 1000, preferably 1 to 100, particularly preferably 2 to 50. The alkylene glycols of the formula (AG) are protic substances having at least one hydroxyl group which, due to their repeating unit -CH2-CH2-O-, provided x is at least 2, can also be referred to as polyethylene glycols. In the alkylene glycols (a1) of the formula (AG), x is an integer from 1 to 10,000. In the work leading to this invention, it has been found that these polyethylene glycols are particularly suitable for improving the fastness properties of the colorants and for optimally adjusting the viscosity of the agents. Polyethylene glycols with a molecular mass between 200 g / mol and 400 g / mol are non-volatile liquids at room temperature. PEG 600 has a melting range of 17 to 22 °C and therefore a paste-like consistency.With molecular weights above 3000 g / mol, PEGs are solid substances and are marketed as flakes or powder. A particularly preferred low-molecular-weight polyethylene glycol is PEG-8. PEG-8 contains an average of 8 ethylene glycol units (x1 = 8), has an average molecular weight of 400 g / mol, and has the CAS number 25322-68-3. PEG-8 is also alternatively known as PEG 400 and is commercially available from companies such as APS. Other suitable low-molecular-weight polyethylene glycols include PEG-6, PEG-7, PEG-9, and PEG-10. Another suitable polyethylene glycol is PEG-32. PEG-32 contains 32 ethylene glycol units (x1 = 32), has an average molecular weight of 1500 g / mol, and has the CAS number 25322-68-3. PEG-32 is also known as PEG 1500 and can be purchased commercially, for example from Clariant.Dimethyl carbonate is also known as dimethyl carbonate and has the CAS number 616-38-6. Diethyl carbonate is also known as diethyl carbonate and has the CAS number 105-58-8. Ethylene carbonate is also known as 1,3-dioxolan-2-one. Ethylene carbonate corresponds to the compound of formula (I) in which R1 and R2 are hydrogen and n is 0. Ethylene carbonate has the CAS number 96-49-1. Propylene carbonate is also known as 4-methyl-1,3-dioxolan-2-one. Propylene carbonate corresponds to the compound of formula (I) in which R1 is methyl, R2 is hydrogen, and n is 0. Propylene carbonate has the CAS numbers 108-32-7 [(RS)-4-methyl-1,3-dioxolan-2-one], 51260-39-0 [(S)-4-methyl-1,3-dioxolan-2-one], and 16606-55-6 [(R)-4-methyl-1,3-dioxolan-2-one]. All of the aforementioned stereoisomers are encompassed by the invention.According to the invention, butylene carbonate is understood to mean 1,2-butylene carbonate, which is alternatively also referred to as 4-ethyl-1,3-dioxolan-2-one and which has the CAS number 4437-85-8. Butylene carbonate corresponds to the compound of formula (I) in which R1 stands for an ethyl group, R2 stands for a hydrogen atom, and n stands for the number 0. Glycerol carbonate is alternatively also referred to as 4-hydroxymethyl-1,3-dioxolan-2-one and has the CAS number 931-40-8. Glycerol carbonate corresponds to the compound of formula (I) in which R1 stands for a hydroxymethyl group, R2 stands for a hydrogen atom, and n stands for the number 0. In a preferred embodiment, the solvent(s) (N-3) represent(s) the cosmetic carrier of the aftertreatment agent (N) and are therefore preferably used as the main ingredient in the aftertreatment agent (N).In this context, the term main constituent refers to an ingredient whose use amount exceeds that of all other ingredients. When used as the main constituent, it can prove advantageous to select a correspondingly high amount of the solvent(s) (N-3). For example, the aftertreatment agent (N) can contain - based on the total weight of the aftertreatment agent (N) - one or more solvents (N-3) other than water in a total amount of 1.0 to 90.0 wt.%, preferably 5.0 to 75 wt.%, more preferably 10.0 to 55 wt.%, even more preferably 15.0 to 45 wt.%, and most preferably 15.0 to 25.0 wt.%.Within the scope of a further particularly preferred embodiment, a process according to the invention is characterized in that the aftertreatment agent (N) - based on the total weight of the aftertreatment agent (N) - contains one or more solvents (N-3) other than water in a total amount of 1.0 to 90.0 wt.%, preferably 5.0 to 75 wt.%, more preferably 10.0 to 55 wt.%, even more preferably 15.0 to 45 wt.% and most preferably 15.0 to 25.0 wt.%. In a further particularly preferred embodiment, a process according to the invention is characterized in that the aftertreatment agent (N) - based on the total weight of the aftertreatment agent (N) - contains 1.0 to 90.0 wt.%, preferably from 5.0 to 75 wt.%, more preferably from 10.0 to 55 wt.%, even more preferably from 15.0 to 45 wt.% and very particularly preferably from 15.0 to 25.0 wt.% of ethanol.As a further optional component, the aftertreatment agent (N) can additionally contain at least one fatty component (N-4) that is liquid at 20°C. Like the solvents (N-3), the liquid fatty components (N-4) can also further reduce the polarity of the aftertreatment agent (N) and further increase the storage stability of the aftertreatment agent. For the purposes of the invention, “fatty components” are understood to mean organic compounds with a solubility in water at room temperature (22°C) and atmospheric pressure (760 mmHg) of less than 1% by weight, preferably less than 0.1% by weight. A fatty component that is liquid at 20°C has a melting point below 20°C (measured under atmospheric pressure (760 mmHg)). The definition of fatty components explicitly includes only uncharged (i.e., non-ionic) compounds. Fatty components have at least one saturated or unsaturated alkyl group with at least 8 carbon atoms.The molecular weight of the fatty components 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 components are neither polyoxyalkylated nor polyglycerylated compounds. Particularly suitable fatty components include, for example, linear or cyclic silicone oils, hydrocarbon oils, liquid fatty acid triglycerides, liquid fatty alcohols, and ester oils, provided that each compound from the aforementioned substance classes has a melting point below 20°C. 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.In a further particularly preferred embodiment, a process according to the invention is characterized in that the aftertreatment agent (N) contains at least one fatty component (N-4) that is liquid at 20°C, which is preferably selected from the group of linear or cyclic silicone oils, hydrocarbon oils, liquid fatty acid triglycerides, liquid fatty alcohols, ester oils, and mixtures thereof. Silicone oils can also be referred to as oligoalkylsiloxanes and polyalkylsiloxanes that are liquid at 20°C, i.e., the silicone oils have a melting point below 20°C (at atmospheric pressure (760 mmHg). Preferred linear silicone oils are oligoalkylsiloxanes of the general formula (V). where z is an integer from 0 to 10000, preferably an integer from 0 to 1000, more preferably an integer from 0 to 100, and most preferably an integer from 0 to 10. Very particularly preferred linear oligoalkylsiloxanes are, for example, - hexamethyldisiloxane . - Decamethyltetrasiloxane Hexamethyldisiloxane has the CAS number 107-46-0 and can be purchased commercially from Sigma-Aldrich, for example. Hexamethyldisiloxane is also sold commercially by Wacker under the trade name Belsil DM 0.65. Octamethyltrisiloxane has the CAS number 107-51-7 and is also commercially available from Sigma-Aldrich. Decamethyltetrasiloxane has the CAS number 141-62-8 and is also commercially available from Sigma-Aldrich. Another particularly suitable silicone oil can be purchased commercially from Clearco under the trade name Dimethicone Fluid 5 cSt. This silicone oil has the generic name Polydimethylsiloxane and has the CAS number 63148-62-9. The substance is a clear, colorless, and odorless liquid, low-viscosity oil. Another silicone oil with particularly good suitability is available from Dow Corning under the trade name Xiameter PMX 200 (1.5 cSt).This oil is also a dimethicone or polydimethylsiloxane, which has the CAS number 63148-62-9. Preferred cyclic oligoalkylsiloxanes are compounds of the general formula (VI). where y is an integer from 1 to 5. Preferably, z is the number 1, 2 or 3. Very particularly preferred cyclic oligoalkylsiloxanes are, for example, - hexamethylcyclotrisiloxane - octamethylcyclotetrasiloxane - decamethylcyclopentasiloxane In a further preferred embodiment, an aftertreatment agent (N) according to the invention is characterized in that it contains as fatty constituent (N-4) at least one silicone oil of the formula (V) and / or (VI), where z is an integer from 0 to 10,000, preferably an integer from 0 to 1,000, more preferably an integer from 0 to 100, and most preferably an integer from 0 to 10, where y is an integer from 1 to 5, preferably an integer from 1 to 3. Within the scope of a further particularly preferred embodiment, a process according to the invention is characterized in that the aftertreatment agent (N) contains at least one fatty component (N-4) which is liquid at 20°C and is selected from the group of siloxanes of the formula (III) and / or the formula (IV) where z is an integer from 0 to 10, preferably an integer from 0 to 3, where y is an integer from 1 to 5, preferably an integer from 1 to 3. In a further particularly preferred embodiment, a process according to the invention is characterized in that the aftertreatment agent (N) contains at least one fatty component (N-4) which is liquid at 20°C and is selected from the group consisting of hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane and / or decamethylcyclopentasiloxane, very particularly preferably hexamethyldisiloxane. In contrast to the reactive organic silicon compounds, in particular the silanes of the formulas (I) and (II), the oligoalkylsiloxanes are composed exclusively of dialkylsilyl groups (in particular dimethylsilyl groups) and trialkylsilyl groups (in particular trimethylsilyl groups) which are linked to one another via oxygen atoms.Thus, the oligoalkylsiloxanes themselves are not reactive compounds within the meaning of this invention and do not contain any hydrolyzable groups. Hydrocarbon oils are also particularly suitable fatty components which are liquid at 20°C. Hydrocarbons are compounds having 8 to 80 carbon atoms and consisting exclusively of carbon and hydrogen atoms. Aliphatic hydrocarbons, such as mineral oils, liquid paraffin oils (e.g., paraffinium liquidum or paraffinum perliquidum), isoparaffin oils, and polydecenes, are particularly preferred in this context. The hydrocarbons according to the invention are also characterized in that they have a melting point below 20°C under atmospheric pressure. Liquid fatty acid triglycerides are also particularly suitable fatty components which are liquid at 20°C. A C. 12 -C 30For the purposes of the present invention, fatty acid triglyceride is understood to mean 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, provided that the fatty acid triglyceride has a melting point below 20°C. For the purposes of the invention, fatty acids are understood to be saturated or unsaturated, unbranched or branched, unsubstituted or substituted C12-C30 carboxylic acids. Unsaturated fatty acids can be monounsaturated or polyunsaturated. In an unsaturated fatty acid, its CC double bond(s) can have the cis or trans configuration.The fatty acid triglycerides are particularly suitable in which at least one of the ester groups is formed 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-diene 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].A further particularly preferred embodiment is therefore an agent for coloring keratin fibers, which is characterized in that it contains, as the fatty component (c) liquid at 20°C, a naturally occurring fatty acid triglyceride and / or mixtures of naturally occurring fatty acid triglycerides, which are present 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. Liquid fatty alcohols are also particularly suitable fatty components that are liquid at 20°C.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). An example of a branched liquid fatty alcohol is 2-octyldodecanol. Ester oils are also particularly suitable fatty components that are liquid at 20 °C. Ester oils are esters of C12-C30 fatty acids with aliphatic C1-C24 alcohols that are liquid at room temperature (20 °C). In other words, ester oils according to the invention are characterized by having a melting point below 20 °C at atmospheric pressure (1013 mbar).A particularly strong improvement in the hair feel was achieved when a post-treatment product containing at least one ester oil from the group of monoesters of C. 12 -C 24 -fatty acids with aliphatic, monovalent C1-C 24 -alcohols. In a further embodiment, the process according to the invention is characterized in that the aftertreatment agent contains at least one fatty component (N-4) from the group of esters of a C 12 -C 30 -fatty acid and an aliphatic, monovalent C1-C 24 -alcohol. Within the group of C 12 -C 30 -fatty acids are the C 12 -C 24 -fatty acids are particularly well suited. Examples of C 12 -C 24-Fatty acids suitable for the formation of ester oils (N-3) are caproic acid, caprylic acid, 2-ethylhexanoic acid, capric acid, lauric acid, isotridecanoic acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselinic acid, linoleic acid, linolenic acid, elaeostearic acid, arachidic acid, gadoleic acid, behenic acid and erucic acid as well as their technical mixtures. Examples of the fatty alcohol components in the ester oils are isopropyl alcohol, caproic alcohol, caprylic alcohol, 2-ethylhexyl alcohol, capric alcohol, lauryl alcohol, isotridecyl alcohol, myristyl alcohol, cetyl alcohol, palmoleyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, elaidyl alcohol, petroselinyl alcohol, linolyl alcohol, linolenyl alcohol, elaeostearyl alcohol, arachyl alcohol, gadoleyl alcohol, behenyl alcohol, erucyl alcohol and brassidyl alcohol as well as their technical mixtures.These C12-C24 fatty acids are esterified by reaction with an aliphatic C1-C24 alcohol, which is particularly preferably a monoalcohol, so that the esterification produces a monoester. The aliphatic C1-C24 alcohols can be linear or branched, saturated, or mono- or polyunsaturated. For example, an alcohol selected from the group consisting of methanol, ethanol, n-propanol, isopropanol, n-butanol, n-pentanol, 2-ethylhexanol, n-hexanol, n-octanol, n-decanol, and n-dodecanol can be used as an aliphatic saturated C1-C24 alcohol. Examples of monohydric, unsaturated, C1-C24 alcohols are oleyl alcohol (octadec-9-en-1-ol), palmitoleyl alcohol (cis-9-hexadecen-1-ol), elaidyl alcohol (trans-9-octadecen-1-ol), and cis-11-octadecen-1-ol. To form the esters, the C12-C24 fatty acids and the C1-C12 alcohols are selected so that the ester formed by esterification of both reactants is an ester oil, i.e.that it has a melting point below 20°C at 1013 mbar. Some ester oils according to the invention can be used in the form of commercially available raw materials, which are mixtures of esters obtained from fatty acids of different chain lengths and / or alcohols of different chain lengths. These raw materials can have a melting range. For these raw materials, a melting point below 20°C means that the melting process begins at a temperature below 20°C. If, for example, an ester oil can be used in the form of a certain raw material on average, this raw material having a melting range of 16 to 27°C, this raw material contains at least one ester oil with a melting point below 20°C. This ester oil is therefore according to the invention. Particular preference according to the invention is given to 2-ethylhexyl palmitate (Cegesoft. ® 24), isopropyl myristate (Rilanit ®IPM), Isononansäure-C16-18-alkylester (Cetiol ® SN), Stearinsäure-2-ethylhexylester (Cetiol ® 868), Cetyloleat, Glycerintricaprylat, Kokosfettalkohol-caprinat / -caprylat (Cetiol ® LC), n- Butylstearat, Oleylerucat (Cetiol ® J 600), Isopropylpalmitat (Rilanit ® IPP), Oleyl Oleate (Cetiol ® ), Laurinsäurehexylester (Cetiol ® A), Di-n-butyladipat (Cetiol ® B), Cetearyl Isononanoate (Cetiol ® SN), Ölsäuredecylester (Cetiol ®V). The ester oil (N-3) is most preferably selected from the group consisting of isopropyl myristate, 2-ethylhexyl palmitate, C16-18 alkyl isononanoate, 2-ethylhexyl stearate, cetyl oleate, coconut fatty alcohol caprate, coconut fatty alcohol caprylate, n-butyl stearate, oleyl erucate, isopropyl palmitate, oleyl oleate, hexyl laurate, cetearyl isononanoate, and decyl oleate. Isopropyl myristate is also alternatively referred to as isopropyl myristic acid ester and has the CAS number 110-27-0. Isopropyl myristate is a colorless and odorless liquid. The melting point is 0–1°C. 2-Ethylhexyl palmitate is alternatively known as hexadecanoic acid 2-ethylhexyl ester and has the CAS number 29806-73-3 .2-Ethylhexyl palmitate is a branched, saturated ester oil of palmitic acid and ethylhexyl alcohols. At room temperature, 2-ethylhexyl palmitate is a clear, colorless liquid with a slightly greasy odor. Isononanoic acid C16-18 alkyl ester is also known as cetearyl isononanoate; this ester has the CAS numbers 84878-33-1 and 84878-34-2. Isononanoic acid C16-18 alkyl ester is a clear, slightly yellowish liquid. At 20 °C, isononanoic acid C16-18 alkyl ester has a viscosity of 19-22 mPas. Stearic acid 2-ethylhexyl ester is also known as ethylhexyl stearate and has the CAS number 91031-48-0. Stearic acid 2-ethylhexyl ester is a clear, slightly yellowish, thin oil. At 20 °C, stearic acid 2-ethylhexyl ester has a viscosity of 14–16 mPas and is therefore an oil at room temperature. Cetyl oleate has the CAS number 22393-86-8.Coconut fatty alcohol caprylate / caprate has the CAS number 95912-86-0. It is a mixture of C8-C10 fatty acids with C12-C18 fatty alcohols. It is a yellow liquid with a melting point of 10°C. n-Butyl stearate is also known as stearic acid butyl ester and has the CAS numbers 85408-76-0 (C16-C18) and 123-95-5 (C18). n-Butyl stearate is a yellowish liquid and begins to melt at 16°C. Oleyreucate has the CAS number 17673-56-2. Oleyreucate is a yellow liquid. At 20°C, oleylerucate has a viscosity of 40-50 mPas and is therefore an oil at room temperature. Isopropyl palmitate is also known as propan-2-yl hexadecanoate and has the CAS number 142-91-6. The melting point of isopropyl palmitate is 13.5 °C. Oleyl oleate is also known as cis-9,10-octadecenyl-cis-9,10-octadecanoate or oleic acid oleyl ester and has the CAS number 3687-45-4.Oleyl oleate is a clear, slightly yellowish oil that has a viscosity of 25–30 mPas at 20°C and is an oil at room temperature. Lauric acid hexyl ester is also known as hexyl laurate and has the CAS number 34316-64-8. Lauric acid hexyl ester is a clear, yellowish, odorless oil at room temperature. At 20°C, lauric acid hexyl ester has a viscosity of 5–7 mPas and is therefore an oil at room temperature. Cetearyl isononanoate is also known as isononanoic acid C16-18 alkyl ester and has the CAS numbers 84878-33-1 and 84878-34-2. Cetearyl isononanoate is a yellowish liquid with a melting point of 16–22°C. Decyl oleate is also known as decyl oleate and has the CAS number 3687-46-5. Decyl oleate is a slightly yellowish liquid with a viscosity of 15–20 mPas at 20°C. Decyl oleate is therefore an oil at room temperature.Preferably, the fatty constituent(s) (N-4) liquid at 20°C are used in specific quantity ranges in the aftertreatment agent (N) according to the invention. Particularly good results were obtained when the colorant (F) contained one or more fatty constituents (c) liquid at 20°C in a total amount of 1.0 to 99% by weight, preferably 1.0 to 95.0% by weight, preferably 10.0 to 90% by weight, more preferably 30.0 to 85% by weight, even more preferably 40.0 to 80% by weight, and most preferably 50.0 to 75% by weight, based on the total weight of the colorant (F). In a further particularly preferred embodiment, a process according to the invention is characterized in that the aftertreatment agent (N) - based on the total weight of the aftertreatment agent (N) - contains one or more fat components (N-4) which are liquid at 20 °C in a total amount of 1.0 to 95.0 wt.-%, preferably from 10.0 to 90 wt.%, more preferably from 30.0 to 85 wt.%, even more preferably from 40.0 to 80 wt.% and most preferably from 50.0 to 75 wt.%. The very best results were obtained with an aftertreatment agent (N) which contained - based on its total weight - - from 15.0 to 45 wt.% ethanol (N-3) and - 40.0 to 80 wt.% hexamethyldisiloxane (N-4). It is understood that the amounts used of components (N-1), (N-2), (N-3) and optionally (N-4) in the aftertreatment agent (N) cannot add up to more than 100 wt.%. The post-treatment agent (N) is intended to improve the washfastness of the direct dyes previously applied in the dyeing step, but is not a dye itself and therefore preferably does not contain any color-imparting compounds. Thus, the post-treatment agent (N) does not contain any oxidation dye precursors, direct dyes, or pigments.In a further particularly preferred embodiment, a process according to the invention is characterized in that the aftertreatment agent (N) contains no color-providing compounds from the group of oxidation dye precursors, direct dyes, and pigments. Pigments within the meaning of the present invention are understood to mean color-providing compounds which, at 25°C, have a solubility in water of less than 0.5 g / L, preferably less than 0.1 g / L, and even more preferably less than 0.05 g / L. The water solubility can be determined, for example, using the method described below: 0.5 g of the pigment is weighed into a beaker. A stirring bar is added. Then, one liter of distilled water is added. This mixture is heated to 25°C for one hour while stirring on a magnetic stirrer.If undissolved components of the pigment are still visible in the mixture after this period, the solubility of the pigment is below 0.5 g / L. If the pigment-water mixture cannot be assessed visually due to the high intensity of the pigment, which may be present in finely dispersed form, the mixture is filtered. If a proportion of undissolved pigment remains on the filter paper, the solubility of the pigment is below 0.5 g / L. Action of the aftertreatment agent (N) on the keratin fibers in step (5) In step (5) of the process according to the invention, the aftertreatment agent (N) is allowed to act on the keratin fibers. Typical exposure times can be, for example, a period of 1 to 60 minutes, preferably 2 to 45 minutes and particularly preferably 5 to 30 minutes.During the action of the aftertreatment agent (N), it has proven particularly advantageous to treat the keratin fibers still covered with the aftertreatment agent with a water-containing agent. In this way, a defined amount of water is again brought into contact with the aftertreatment agent. The defined amount of water is preferably applied to the keratin fibers still coated with the aftertreatment agent (N). The amount of water applied in step (5) is preferably at most twice the weight of the aftertreatment agent (N) applied in step (3). By additionally applying the defined amount of water in step (5), post-condensation or post-crosslinking of the organic C1-C6 alkoxysilanes can be initiated. This post-crosslinking ensures further strengthening of the film or coating.Within the scope of a further embodiment, a method is preferred which comprises (5) allowing the aftertreatment agent (N) to act on the keratin fibers, wherein during the action a water-containing agent (W) is applied to the keratin fibers still covered with the aftertreatment agent (N) and is mixed with the aftertreatment agent (N). However, the application of the water-containing agent (W) in step (5) should not yet result in the aftertreatment agent (N) being washed out, i.e. the additional amount of water applied to the hair coated with the aftertreatment agent (N) should be large enough that the C1-C6 alkoxysilanes can come into contact with a sufficient amount of water, but the aftertreatment agent (N) is not washed off the hair fibers or flows down them.As the work leading to this invention has shown, this is the case when the weight of the water-based agent (W) applied in step (5) is at most twice the weight of the after-treatment agent (N) applied in step (4). Within the scope of a further embodiment, a method is preferred comprising (5) allowing the after-treatment agent (N) to act on the keratin fibers, wherein, during the action, a water-based agent (W) is applied to the keratin fibers still covered with the after-treatment agent (N) in an amount that is at most twice the amount of the after-treatment agent (N) applied to the keratin fibers.In a further particularly preferred embodiment, a method according to the invention is characterized in that the amount by weight of water-containing agent (W) that comes into contact with the aftertreatment agent (N) still present on the keratin fibers as a result of the application of the water-containing agent (W) is at most twice as large as the weight of the aftertreatment agent (N) applied in step (4). In a further particularly preferred embodiment, a method according to the invention is characterized in that the amount by weight of water-containing agent (W) that comes into contact with the aftertreatment agent (N) still present on the keratin fibers as a result of the application of the water-containing agent (W) is at most as large as the weight of the aftertreatment agent (N) applied in step (4). The amount of water-containing agent (W) and the amount of aftertreatment agent (N) are understood here to be the amounts by weight.If, for example, 50 g of after-treatment agent (N) are applied to the keratin fibers or hair in step (4), preferably no more than 100 g of water-containing agent (W) are applied to the hair / keratin fibers in step (5). Particularly preferably, no more than 50 g of the water-containing agent (W) is applied. The water-containing agent (W) itself preferably contains water as the main component, but can also contain other ingredients such as preservatives and / or in particular thickeners. The water-containing agent (W) preferably contains - based on the total weight of the water-containing agent (W) - 50 to 100 wt.%, preferably 60 to 99.9 wt.%, more preferably 60 to 99.9 wt.% and very particularly preferably 70 to 99.9 wt.% water. In principle, pure water can also be applied to the hair still covered with the after-treatment agent and mixed with the after-treatment agent. In this case, the water-containing agent (W) consists of water orcontains this at 100% by weight. However, since pure water is very thin and relatively difficult for the user to apply, it has proven preferable to at least thicken the water with a thickener. Other conditioning or styling ingredients can also optionally be included in the water-containing agent (W). The defined amount of water can be distributed over the keratin fibers in step (5) and mixed with the after-treatment agent (N) that is also still on the keratin fibers. This mixing can be supported by massaging it in by hand or with a brush. After applying the water-containing agent (W) and mixing it with the after-treatment agent (N), the mixture of (N) and (W) can be left to act on the keratin fibers for some time. Possible exposure times here are 1 to 45 minutes, preferably 2 to 30 minutes, particularly preferably 5 to 15 minutes.During this exposure time, the keratin fibers or hair can also be kneaded or massaged several times to really ensure a closed film forms around each keratin fiber. Rinsing out the after-treatment agent (N) or drying the keratin fibers without rinsing out the after-treatment agent (N) in step (6) In step (6) of the method according to the invention, the after-treatment agent (6) can be rinsed out in one embodiment. In a further embodiment, however, it is also possible not to rinsing out the after-treatment agent (N), but to dry the keratin fibers still coated with the after-treatment agent (N) - optionally diluted by adding water - without rinsing. Without rinsing out the after-treatment agent (N), the film formed on the keratin fibers can continue to condense or harden for some time.Since particularly resistant films can be obtained in this way, this embodiment is very particularly preferred. In another very particularly preferred embodiment, a process according to the invention is therefore characterized by (6) drying the keratin fibers without prior washing out of the aftertreatment agent (N). During drying, the water (N-2) and the solvent(s) (N-3) present in the aftertreatment agent evaporate or vaporize, and the film formed by the condensation of the C1-C6 alkoxysilanes hardens. Drying can take place either in air or under the influence of heat, for example with the aid of a heat cap or a hairdryer. A period of a few seconds up to 60 minutes, preferably from 30 seconds to 30 minutes, can elapse between steps (4) and (6).If the keratin fibers are dried in the air, step (6) can begin immediately after step (4), if the aftercare product has already begun to dry during the application time. The drying of the keratin fibers or hair that takes place in step (6) can be accelerated by heat treatment. Heat treatment means that the keratin fibers are brought into contact with a heated device or that this heated device is applied to or on the keratin fibers. Furthermore, the keratin fibers can also be brought into contact with warm / hot air for heat treatment. The device used can be, for example, a hairdryer, a blow dryer, a heat cap, a straightening iron, a curling iron, or an infrared lamp.In a particularly preferred embodiment, a method according to the invention is characterized in that the heat treatment is carried out using a hair dryer, a blow dryer, a heat cap, a straightening iron, a curling iron, or an infrared lamp. Furthermore, it has been found that it is preferred if the treatment temperature during the heat treatment is between 40°C and 210°C, preferably from 50°C to 190°C, more preferably from 50°C to 170°C, even more preferably from 50°C to 150°C, and most preferably from 50°C to 100°C. In other words, it has been found to be particularly preferred if the heat treatment is carried out using a device which is heated to a temperature of 40 °C to 210 °C, preferably from 50 °C to 190 °C, more preferably from 50 °C to 170 °C, even more preferably from 50 °C to 150 °C and most preferably from 50 °C to 100 °C.Within the scope of a further particularly preferred embodiment, a method according to the invention is characterized by (4) drying the keratin fibers without prior washing out of the aftertreatment agent (N) at a temperature of 40 °C to 210 °C, preferably from 45 °C to 190 °C, more preferably from 45 °C to 170 °C, even more preferably from 45 °C to 150 °C and most preferably from 45 °C to 100 °C. For example, the keratin fibers or the hair can be treated with a hairdryer that blows warm or hot air onto the keratin fibers. This air is very preferably 50 to 100 °C. Or the keratin fibers or the hair are held under an infrared lamp, which is particularly preferably set to a temperature of 50 to 100 °C. For the purpose of heat treatment, hair can also be pressed between two appropriately tempered plates of a straightening iron, whereby the plates can simultaneously be moved along the fiber.The plates of the straightening iron can, for example, be set to a temperature of up to 210 °C. The heat treatment can expediently be carried out until the keratin fibers still coated with the aftertreatment agent (F) have begun to dry or have dried completely. In principle, the user can freely choose the period of time between the application of the two agents (F) and (N). However, it has proven particularly preferable if no further agents, such as shampoos, conditioners or styling products are applied between the application of the two agents (F) and (N). For this reason, the maximum period of time between the application of the two agents (F) and (N) is particularly preferably limited to a maximum time interval of 24 hours.It has proven particularly preferred if a period of maximum 24 hours, preferably maximum 12 hours, more preferably maximum 6 hours, and most preferably maximum 3 hours, elapses between the application of the colorant (F) and the application of the aftertreatment agent (N) to the keratin fibers. Within the scope of a further very preferred embodiment, a method according to the invention is characterized in that a period of maximum 24 hours, preferably maximum 12 hours, more preferably maximum 6 hours, and most preferably maximum 3 hours, elapses between the application of the colorant (F) and the aftertreatment agent (N).

[0002] Examples 1. Colorants (F) The following colorants were prepared (all data in wt. %) unless otherwise stated) F1 (wt. %) F2 (wt. %) Cetearyl alcohol 5.0 5.0 Isopropyl myristate 2.0 2.0 Behentrimonium chloride 1.9 1.9 Distearoylethyl Hydroxyethylmonium methosulfate 1.1 1.1 Phenoxyethanol 1.1 1.1 Stearamidopropyl dimethylamine 1.0 1.0 Cetyl palmitate 0.7 0.7 Citric acid 0.2 0.2 Polyquaternium-37 0.15 0.15 Magnesium citrate 0.2 0.2 HB Blue 16 (3-[[9,10-Dihydro-4-(methylamino)-9,10- --- 0.3 dioxo-1-anthracenyl] amino]-N,N-dimethyl-N-propyl-, 1-propanaminium, bromide, CAS No. 502453-61-4) Basic Violet 2 (4-((4-Amino-3-methylphenyl)(4-imino- 0,3 --- 3-methyl-2,5-cyclohexadien-1-ylidene)methyl)-2- methylphenylamine-monohydrochloride, CAS No. 3248-91-7 Water (distilled) ad 100 ad 100 2. Post-treatment agent (N) Preparation of the silane blend In a 500 ml round-bottom flask, 25 g of ethanol (abs.) and 49,7 g of methyltriethoxysilane were mixed together with stirring. This mixture was heated to 50 °C with continued stirring. Then, 6.8 g of a 1% solution of sulfuric acid in water were added dropwise over a period of approximately 5 minutes. The temperature of the reaction mixture rose to 62 °C and then fell to 55 °C after the addition was complete. Stirring was continued for another 20 minutes. Then, 18.6 g of (3-aminopropyl)triethoxysilane were added dropwise over a period of approximately 5 minutes. After the addition was complete, the mixture was stirred at 50 °C for another 45 minutes and then transferred to an airtight glass container. The silane blend prepared in this way was incorporated into the following post-treatment agents (N) (all data, unless otherwise stated, in % by weight): Post-treatment agent (N) (N1) (N2) (N3) (N4) (% by weight) (% by weight) (% by weight) Silane blend 10 10 10 10 Ethanol (99%) --- 70 45 20 Hexamethyldisiloxane (Belsil DM 0.65,--- 20 45 70 Wacker) Water (distilled) 90 --- --- --- Comparison Invention Invention Invention 3. Application The colorants (F1) and (F2) were applied to strands of hair (Kerling 9-0, length approx. 5 cm). For this purpose, the strands of hair were moistened, then the colorant was applied (0.4 g of colorant per 1 g of hair strand) and left to work for 15 minutes at 30 °C. The strands of hair were then rinsed under running water for 1 minute. Immediately afterwards, the respective after-treatment product was applied to the still damp strands of hair (0.4 g of after-treatment product per 1 g of hair strand) and massaged in. The after-treatment product was left to work for 5 minutes, then water was added again (0.4 g of water per g of hair strand) was applied to the hair strand. Each hair strand was carefully massaged again. After a contact time of 5 minutes, each strand was dried at 50°C without rinsing out the after-treatment product. 4. Measurement of Wash Fastness After drying, the strands were stored overnight and then visually assessed under a daylight lamp. 0 HW is the color result obtained directly after coloring and drying. To measure wash fastness, the strands were then washed 6 or 12 times (6 HW, 12 HW). For each wash, a commercially available shampoo (0.25 g shampoo (Schauma 7 Herbs) per 1 g of hair) was applied to the strand and massaged in with the fingers for 30 seconds. The shampoo was then rinsed for 1 minute under running water.The strands were rinsed with lukewarm water and dried. The procedure described above corresponds to one hair wash. The process was repeated for each subsequent wash. After the appropriate number of washes, the strands were visually assessed again under a daylight lamp. Colour intensity: ++++ very high +++ high ++ medium + low The following colour results were obtained: Colouring with (F1) Colouring with (F1) Colouring with (F1) Colouring with (F1) (F1) 15 min (F1) 15 min (F1) 15 min apply, then apply, then apply, then apply, then rinse rinse rinse rinse apply (N1) to apply (N2) to apply (N3) to apply (N4) to still damp hair still damp hair still damp hair leave on for 5 min, leave on for 5 min, leave on for 5 min, leave on for 5 min, apply again water again water again water again water apply and apply and apply and apply and mix, mix for 5 min,0 HW: violet ++++ 0 HW: violet ++++ 0 HW: violet ++++ 0 HW: violet ++++ 6 HW: brown +++ 6 HW: violet +++ 6 HW: violet ++++ 6 HW: violet ++++ 12 HW: light brown + 12 HW: brown violet 12 HW: violet +++ 12 HW: violet +++ ++ Compared to the use of (F1) / (N1), the washfastness of the violet dyeings (F1) could be improved by post-treatment with (N2), (N3) and (N4). When treated with (N3) and (N4), the intensity of the violet nuance was minimally reduced by repeated hair washes,without any visible color shift to brown. The best results were achieved with the (F1) / (N4) process. Coloring with (F2) Coloring with (F2) Coloring with (F2) Coloring with (F2) (F2) 15 min (F2) 15 min (F2) 15 min apply, then apply, then apply, then apply, then rinse rinse rinse rinse apply (N1) to still damp hair still damp hair still damp hair still damp hair leave on for 5 min, leave on for 5 min, leave on for 5 min, leave on for 5 min, apply again water again water again water again water apply and apply and apply and apply and mix, mix for 5 min, mix for 5 min, mix for 5 min,leave on for 5 minutes leave on for 5 minutes leave on for 5 minutes strand without strand without strand without strand without rinsing at 50 °C rinse at 50 °C rinse at 50 °C rinse at 50 °C dry dry dry dry 0 HW: dark blue 0 HW: dark blue 0 HW: dark blue 0 HW: dark blue +++++ +++++ +++++ +++++ 6 HW: blue +++ 6 HW: dark blue 6 HW: dark blue 6 HW: dark blue ++++ +++++ +++++ 12 HW: light blue ++ 12 HW: blue +++ 12 HW: dark blue 12 HW: dark blue ++++ +++++ Compared to the use of (F2) / (N1), the washfastness of the blue dyeings (F2) could be improved by post-treatment with (N2), (N3) and (N4). During post-treatment with (N4), no reduction in color intensity was observed even after 12 washes. The color obtained with the (F2) / (N4) method exhibited the best washfastness.

Claims

1. A method for dyeing keratinic fibers, in particular human hair, comprising the following steps in the given order: (1) applying a dye (F) to the keratinic fibers, wherein the dye (F) contains: (F-1) one or more direct dyes, (2) allowing the dye (F) to act on the keratinic fibers, (3) optionally rinsing the dye (F), (4) applying a post-treatment agent (N) to the keratinic fibers, wherein the post-treatment agent (N) contains – based on the total weight of the post-treatment agent (N): (N-1) one or more organic C1-C6-alkoxysilanes and / or their condensation products, (N-2) less than 25.0 wt.% water, and (N-3) at least one solvent other than water, (5) allowing the post-treatment agent (N) onto the keratin fibers, and (6) if necessary, rinsing out the after-treatment agent (N). 2.The process according to claim 1, characterized in that the colorant (F) contains at least one direct dye (F-1) from the group of cationic, anionic, and / or non-ionic direct dyes, particularly preferably from the group of cationic direct dyes.

3. The process according to any one of claims 1 to 2, characterized by (2) allowing the colorant (F) to act on the keratin fibers for a period of 2 to 60 minutes, preferably 5 to 45 minutes, and particularly preferably 5 to 30 minutes, and (3) rinsing out the colorant (F). 4.Process according to one of claims 1 to 3, characterized in that the aftertreatment agent (N) contains one or more organic C1-C6-alkoxysilanes (N-1) from the group consisting of (3-aminopropyl)triethoxysilane, (3-aminopropyl)trimethoxysilane, 1-(3-aminopropyl)silanetriol, (2-aminoethyl)triethoxysilane, (2-aminoethyl)trimethoxysilane, 1-(2-aminoethyl)silanetriol, (3-dimethylaminopropyl)triethoxysilane, (3-dimethylaminopropyl)trimethoxysilane, 1-(3-dimethylaminopropyl)silanetriol, (2-dimethylaminoethyl)triethoxysilane, (2-dimethylaminoethyl)trimethoxysilane and / or their condensation products.

5. Process according to one of claims 1 to 4, characterized in that the aftertreatment agent (N) comprises one or more organic C1-C6-alkoxysilanes (N-1) from the. Group consisting of methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, octyltrimethoxysilane, octyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane and / or their condensation products.

6. The process according to any one of claims 1 to 5, characterized in that the aftertreatment agent (N) contains—based on the total weight of the aftertreatment agent (N)—one or more organic C1-C6-alkoxysilanes (N-1) and / or their condensation products in a total amount of 0.1 to 30.0 wt. %, preferably 0.5 to 20.0 wt. %, more preferably 5.0 to 15.0 wt. %, and most preferably 6.0 to 12.5 wt. %.

7. The method according to any one of claims 1 to 6, characterized in that the aftertreatment agent (N) - based on the total weight of the aftertreatment agent (N) - 0 to 20.0 wt.%, preferably from 0.1 to 10.0 wt.%, more preferably from 0.1 to 5.0 wt.- %, and particularly preferably from 0.5 to 3.0 wt.% water (N-2).

8. The process according to any one of claims 1 to 7, characterized in that the aftertreatment agent (N) contains at least one solvent (N-3) other than water, which is selected from the group consisting of ethanol, isopropanol, 1,2-propylene glycol, 1,3-propylene glycol, ethylene glycol, 1,2-butylene glycol, dipropylene glycol, diethylene glycol monoethyl ether, glycerol, phenoxyethanol, benzyl alcohol, poly-C1-C6-alkylene glycols, dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, butylene carbonate and glycerol carbonate, preferably from the group consisting of ethanol and isopropanol, particularly preferably ethanol.

9. Process according to one of Claims 1 to 8, characterized in that the aftertreatment agent (N) contains – based on the total weight of the aftertreatment agent (N) – one or more solvents (N-3) other than water in a total amount of 1.0 to 90.0 wt.-%, preferably from 5.0 to 75 wt.%, more preferably from 10.0 to 55 wt.%, even more preferably from 15.0 to 45 wt.%, and most preferably from 15.0 to 25.0 wt.%.

10. The process according to any one of claims 1 to 9, characterized in that the aftertreatment agent (N) contains at least one fatty constituent (N-4) that is liquid at 20°C, which is preferably selected from the group consisting of linear or cyclic silicone oils, hydrocarbon oils, liquid fatty acid triglycerides, liquid fatty alcohols, ester oils, and mixtures thereof.

11. Process according to one of claims 1 to 10, characterized in that the aftertreatment agent (N) contains at least one fatty component (N-4) which is liquid at 20 °C and is selected from the group of siloxanes of the formula (III) and / or of the formula where z is an integer from 0 to 10, preferably an integer from 0 to 3, where y is an integer from 1 to 5, preferably an integer from 1 to 3.

12. The method according to any one of claims 1 to 11, characterized in that the aftertreatment agent (N) contains at least one fatty component (N-4) which is liquid at 20°C and is selected from the group consisting of hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane and / or decamethylcyclopentasiloxane, particularly preferably hexamethyldisiloxane.

13. The method according to any one of claims 1 to 12, characterized in that the aftertreatment agent (N)—based on the total weight of the aftertreatment agent (N)—contains one or more fatty components (N-4) that are liquid at 20°C in a total amount of 1.0 to 95.0 wt.%, preferably 10.0 to 90 wt.%, more preferably 30.0 to 85 wt.%, even more preferably 40.0 to 80 wt.%, and most preferably 50.0 to 75 wt.%.Process according to one of claims 1 to 13, characterized in that the aftertreatment agent (N) does not contain any color-providing compounds from the group of oxidation dye precursors, direct dyes and pigments.

15. The method according to any one of claims 1 to 14, comprising (5) allowing the aftertreatment agent (N) to act on the keratin fibers, wherein, during the action, a water-containing agent (W) is applied to the keratin fibers still covered with the aftertreatment agent (N) and mixed with the aftertreatment agent (N).

16. The method according to claim 15, characterized in that the amount by weight of water-containing agent (W) that comes into contact with the aftertreatment agent (N) still on the keratin fibers as a result of the application of the water-containing agent (W) is at most twice the weight of the aftertreatment agent (N) applied in step (4).

17. The method according to any one of claims 1 to 16, characterized by (6) drying the keratin fibers without prior washing out of the aftertreatment agent (N). 18.Method according to one of claims 1 to 17, characterized in that between the application of the coloring agent (F) and the aftertreatment agent (N) there is a period of maximum 24 hours, preferably of maximum 12 hours, more preferably of maximum 6 hours and most preferably of maximum 3 hours.

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