Dye products for keratin fibers containing ammonium salts

Abstract

The present invention relates to a dyeing product for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising at least compositions A and B, wherein composition A comprises a) one or more direct hair dyes and b) one or more alkalizing agents, and composition B has a pH of 1 to 6 and c) the following general formula NH4 + Y - (However, Y - OH - and CO3 2- The present invention relates to a dyed product characterized by an aqueous composition containing one or more ammonium salts represented by an anion other than (1), wherein the total concentration of the oxidizing agent in composition B is 1% by mass or less, preferably 0.1% by mass or less, relative to the total mass of composition B, and more preferably, composition B does not contain an oxidizing agent.

Description

Technical Field

[0001] The present invention relates to a dyeing product comprising at least composition A and B, wherein composition B contains an ammonium salt. A composition C, method and use for dyeing are disclosed.

Background Art

[0002] Direct dyes have certain safety advantages compared to oxidative dyes, but generally have the disadvantage of inferior dyeing performance. Therefore, many inventions have hitherto focused on improving dyeing using oxidative dyes that originally achieved excellent dyeing strength.

[0003] For example, EP3427719 discloses ammonium salts in an oxidative composition combined with an oxidative dye, but there is no description of an acidic composition in which a direct dye and a small amount of an oxidizing agent are present or no oxidizing agent is present at all.

[0004] WO2020 / 127250 discloses improving the dyeing strength by using a combination of a specific direct dye and an alkylated ammonium salt. In contrast, the present invention uses an unalkylated ammonium salt.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] Therefore, despite attempts according to the prior art, the problems with direct dyes that are inferior in dyeing strength and washing fastness remain unsolved. Therefore, the actual development of improved dyeing products using direct dyes is required. [Means for solving the problem]

[0007] The first object of the present invention is a dyeing product for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising at least compositions A and B. - Composition A comprises a) one or more direct hair dyes and b) one or more alkalizing agents. - Composition B has a pH of 1 to 6 and the following general formula: NH4 + Y - (However, Y - OH - and CO3 2- (Anions other than the above) An aqueous composition comprising one or more ammonium salts represented by, The total concentration of the oxidizing agent in composition B is 1% by mass or less, preferably 0.1% by mass or less, relative to the total mass of composition B, and more preferably composition B does not contain any oxidizing agent. This is a dyed product characterized by the following features.

[0008] A second object of the present invention is a method for dyeing keratin fibers, preferably human keratin fibers, and more preferably human hair. i) A step of preparing composition A as defined above, ii) A step of preparing composition B as defined above, iii) A step of mixing the compositions from steps i) and ii) immediately before applying them to keratin fibers to obtain a ready-to-use composition having a pH of 7 to 12, iv) A step of applying a ready-to-use composition onto keratin fibers for 1 to 60 minutes, v) Optionally, a step to wash away keratin fibers and This method includes [something].

[0009] A third object of the present invention is the use of a composition as defined above as composition B for enhancing the color intensity and wash fastness of one or more direct dyes on keratin fibers, preferably human keratin fibers, more preferably human hair, provided that composition B is mixed with composition A as defined above immediately prior to application onto the keratin fibers.

Embodiments for Carrying Out the Invention

[0010] The inventors have unexpectedly and surprisingly found that the dyeing products, compositions, methods and uses according to the independent claims of the present invention improve the intensity of the dyeing results with direct dyes and, moreover, their wash fastness. Furthermore, the dyed keratin fibers had an attractive aesthetic appearance with little or no damage.

[0011] Dyeing product The present invention relates to a dyeing product for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising at least compositions A and B, - Composition A contains a) one or more hair direct dyes and b) one or more alkalizing agents, - Composition B has a pH of 1 to 6 and c) the following general formula: NH4 + Y - (where Y - is an anion other than OH - and CO3 2- )(represented by), and contains one or more aqueous ammonium salts, The total concentration of the oxidizing agent in composition B is 1% by mass or less, preferably 0.1% by mass or less, more preferably composition B does not contain an oxidizing agent, based on the total mass of composition B. The total concentration of the oxidizing agent in composition A is preferably 1% by mass or less, more preferably 0.1% by mass or less, based on the total mass of composition A, from the viewpoint of wash fastness, and even more preferably composition A does not contain an oxidizing agent. The present invention relates to a dyeing product, characterized by the above.

[0012] The present invention relates to a dyeing product, characterized by the above.

[0013] It is even more preferable that the dyed product is a non-oxidative dyed product from the viewpoint of wash fastness and damage reduction.

[0014] From the viewpoint of reducing damage, the total concentration of the oxidizing agent in composition A is preferably 1% by mass or less, more preferably 0.1% by mass or less, relative to the total mass of composition A, and more preferably, composition A does not contain an oxidizing agent. It is particularly preferable that composition A does not contain oxidative decolorizing compounds such as perates and / or peroxy salts, nor hydrogen peroxide.

[0015] The following general formula NH4 + Y - (However, Y - OH - and CO3 2- It is even more preferable, from the viewpoint of staining strength and wash fastness, that one or more ammonium salts represented by anions other than (1) have a molar mass of 300 g / mol or less.

[0016] It is even more preferable from the viewpoint of reducing damage that the dyed product of the present invention is a non-oxidative dyed product. Within the scope of the present invention, non-oxidative means a product that does not contain an oxidizing agent.

[0017] In this case, neither composition A nor composition B contains an oxidizing agent.

[0018] Therefore, the disclosure of the present invention also relates to a non-oxidative dyeing product for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising at least compositions A and B. - Composition A comprises a) one or more direct hair dyes and b) one or more alkalizing agents. - Composition B has a pH of 1 to 6 and contains the following general formula NH4: + Y - (However, Y - OH - and CO3 2- An aqueous composition comprising one or more ammonium salts represented by anions other than the above, Compositions A and / or B relate to non-oxidative dyeing products that do not contain oxidizing agents.

[0019] It is even more preferable from the viewpoint of reducing damage that the dyed product of the present invention is a non-reducing dyed product. Within the scope of the present invention, non-reducing means a product that does not contain a reducing agent.

[0020] Therefore, the disclosure of the present invention also relates to a non-oxidative, non-reducible dyeing product for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising at least compositions A and B. - Composition A comprises a) one or more direct hair dyes and b) one or more alkalizing agents. - Composition B has a pH of 1 to 6 and contains the following general formula NH4: + Y - (However, Y - OH - and CO3 2- An aqueous composition comprising one or more ammonium salts represented by anions other than the above, Composition B does not contain a reducing agent. This invention relates to a non-oxidative, non-reducible dyeing product characterized by the following features.

[0021] The appropriate mixing mass ratio of composition A and composition B in the dyeing product of the present invention is in the range of 0.1 to 10, preferably in the range of 0.2 to 5, and more preferably in the range of 0.3 to 3. The most preferred mixing mass ratio of composition A and composition B in the dyeing product of the present invention is 1.

[0022] From the viewpoint of dyeing strength, it is preferable that the one or more compounds described in group a) of composition A are one or more nonionic direct dyes and / or anionic direct dyes and / or salts thereof, and / or mixtures thereof.

[0023] One or more compounds described in Group a) of Composition A are Acid Black 1, Acid Blue 1, Acid Blue 3, Food Blue 5, Acid Blue 7, Acid Blue 9, Acid Blue 74, Acid Orange 3, Acid Orange 6, Acid Orange 7, Acid Orange 10, Acid Red 1, Acid Red 14, Acid Red 18, Acid Red 27, Acid Red 50, Acid Red 52, Acid Red 73, Acid Red 87, Acid Red 88, Acid Red 92, Acid Red 155, Acid Red 180, Acid Violet 9, Acid Violet 43, Acid Violet 49, Acid Yellow 1, Acid Yellow 23, Acid Yellow 3, Food Yellow No.8, D&C Brown No.1, D&C Green No.5, D&C Green No.8, D&C Orange No.4, D&C Orange No.10, D&C Orange No.11, D&C Red No.21, D&C Red No.27, D&C Red No.33, D&C Violet 2, D&C Yellow No.7, D&C Yellow No.8, D&C Yellow No.10, FD&C Red 2, FD&C Red 40, FD&C Red No.4, FD&C Yellow No.6, FD&C Blue 1, Food Black 1, Food Black 2, Disperse Black 9, Disperse Violet 1, Acid Red 52, DC Violet 2, DC Red 33, DC Orange 4, DC Red 27, DC Yellow 10, HC Blue 18, HC Red 18, HC Yellow 16, Basic Blue 6, Basic Blue 7, Basic Blue 9, Basic Blue 26, Basic Blue 41, Basic Blue 99, Basic Brown 4, Basic Brown 16, Basic Brown 17, Natural Brown 7, Basic Green 1, Basic Red 2, Basic Red 12, Basic Red 22, Basic Red 76, Basic Violet 1, Basic Violet 2, Basic Violet 3, Basic Violet 10, Basic Violet 14, Basic Yellow 57, Basic Red 51, Basic Yellow 87, HC Blue 17 and Basic Orange A color number of 31 is particularly preferable from the viewpoint of dyeing strength. More preferable are Basic Red 51, Basic Yellow 87, Basic Orange 31, HC Blue 17 and Basic Blue 124, HC Blue No.2, HC Blue No.4, HC Blue No.5, HC Blue No.6, HC Blue No.7, HC Blue No.8, HC Blue No.9, HC Blue No.10, HC Blue No.11, HC Blue No.12, HC Blue No.13, HC Brown No.1, HC Brown No.2, HC Green No.1, HC Orange No.1, HC Orange No.2, HC Orange No.3, HC Orange No.5, HC Red BN, HC Red No.1, HC Red No.3, HC Red No.7, HC Red No.8, HC Red No.9, HC Red No.10, HC Red No.11, HC Red No.HC Red No. 54, HC Red No. 14, HC Violet BS, HC Violet No. 1, HC Violet No. 2, HC Yellow No. 2, HC Yellow No. 4, HC Yellow No. 5, HC Yellow No. 6, HC Yellow No. 7, HC Yellow No. 8, HC Yellow No. 9, HC Yellow No. 10, HC Yellow No. 11, HC Yellow No. 12, HC Yellow No. 13, HC Yellow No. 14, HC Yellow No. 15, HC Blue 18, HC Red 18, HC Yellow 16, Disperse Black 9, Acid Yellow 1, and / or salts thereof, and / or mixtures thereof.

[0024] More preferably, the compounds in group a) are selected from HC Blue 18, HC Red 18, HC Yellow 16, Disperse Black 9, Acid Yellow 1, and / or salts thereof, and / or mixtures thereof, from the viewpoint of staining strength and wash fastness.

[0025] The most preferred compounds described in group a) are selected from HC Blue 18, HC Red 18, HC Yellow 16, and / or salts thereof, and / or mixtures thereof, in terms of staining intensity, color brilliance, and cosmetic safety.

[0026] From the viewpoint of staining intensity, the total concentration of one or more compounds listed in group a) in composition A is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and still more preferably 0.25% by mass or more, based on the total mass of composition A.

[0027] From the viewpoint of cosmetic safety, the total concentration of one or more compounds listed in group a) in composition A is preferably 15% by mass or less, more preferably 12% by mass or less, and even more preferably 10% by mass or less, based on the total mass of composition A.

[0028] To achieve the effects described above, the total concentration of one or more compounds listed in group a) in composition A is preferably in the range of 0.05% to 15% by mass, more preferably in the range of 0.1% to 12% by mass, and more preferably in the range of 0.25% to 10% by mass, relative to the total mass of composition A.

[0029] From the viewpoint of staining intensity, it is even more preferable that the one or more compounds described in group b) be selected from one or more organic alkalizing agents and / or ammonium hydroxide.

[0030] Preferably, one or more compounds in group b) are one or more alkanolamines and / or salts thereof and / or ammonium hydroxide; more preferably, one or more compounds in group b) are selected from monoethanolamine, diethanolamine, monoethanolmethylamine, monoethanoldimethylamine, diethanolmethylamine, monoethanolethylamine, monoethanoldiethylamine, diethanolethylamine, monoethanolpropylamine, monoethanoldipropylamine, diethanolpropylamine, monoethanolbutylamine, diethanolbutylamine, trimethylamine, triethylamine, 2-amino-2-methylpropanol, tris-(hydroxymethyl)-aminomethane and / or salts thereof and / or mixtures thereof; most preferably, they are selected from monoethanolamine, 2-amino-2-methylpropanol, tris-(hydroxymethyl)-aminomethane, ammonium hydroxide and / or mixtures thereof.

[0031] Ammonium hydroxide is described as an alkalizing agent in group b) of composition A, meaning that those skilled in the art will see that ammonium hydroxide is not an ammonium salt within the range of compounds described in group c). Ammonium hydroxide is an aqueous solution of the gaseous compound ammonia, and it is not possible to extract a solid salt from the compound at 25°C and atmospheric pressure.

[0032] From the viewpoint of alkalinity and staining intensity, the total concentration of one or more compounds listed in group b) in composition A is preferably 0.1% by mass or more, preferably 0.25% by mass or more, and more preferably 0.5% by mass or more, relative to the total mass of composition A.

[0033] The total concentration of one or more compounds listed in group b) in composition A is preferably 30% by mass or less, preferably 25% by mass or less, and more preferably 20% by mass or less, based on the total mass of composition A, from the viewpoint of alkalinity, staining intensity, and cosmetic safety.

[0034] To achieve the effects described above, the total concentration of one or more compounds listed in group b) in composition A is preferably in the range of 0.1% to 30% by mass, more preferably in the range of 0.25% to 25% by mass, and more preferably in the range of 0.5% to 20% by mass, relative to the total mass of composition A.

[0035] Product form of composition A In one embodiment of the present invention, composition A is a powder composition and contains water in an amount of 10% by mass or less, preferably 1% by mass or less, and more preferably 0.1% by mass or less, relative to the total mass of composition A, and more preferably composition A is an anhydrous powder composition.

[0036] The term "powder" refers to a solid composition that is free-flowing at 25°C and atmospheric pressure, consisting of individual particles or aggregates in the micron and submicron ranges.

[0037] The term "anhydrous" means that no added water is present. However, this does not rule out the presence of adsorbed water or crystal water in any of the powder components. In either case, the presence of some water does not alter the physical state of aggregation of the powder composition.

[0038] If composition A is a powder composition, it is preferable from the viewpoint of cosmetic applicability that composition A contains one or more powdered excipients. The term "excipient" means a compound that can act as a filler and as a dispersant for other compounds in composition A, does not react with dyes or alkalizing agents, and therefore imparts a certain degree of storage stability to the powder over a long period of time.

[0039] If composition A of the present invention is a powder composition, it may contain organic and / or inorganic powdered excipients in which the dye is dispersed.

[0040] Suitable organic and / or inorganic powdered excipients, from the standpoint of stability, include, for example, diatomaceous earth, kaolin, bentonite, starch, especially corn, tapioca, rice, wheat and potato, nylon powder, montmorillonite, gypsum, sawdust and perlite, and more preferably cornstarch.

[0041] From the viewpoint of achieving good dispersibility of the dye in the powder and rapid dissolution of the powder, preferably the total concentration of the powdered excipient in composition A, more preferably the total concentration of the organic and / or inorganic powdered excipient in composition A, is 30% by mass or more, more preferably 50% by mass or more, even more preferably 60% by mass or more, even more preferably 65% ​​by mass or more, even more preferably 70% by mass or more, and even more preferably 75% by mass or more, based on the total mass of composition A.

[0042] From the viewpoint of achieving good dispersibility of the dye in the powder and freedom of formulation, preferably the total concentration of the powdered excipients in composition A, more preferably the total concentration of the organic and / or inorganic powdered excipients in composition A, is 98% by mass or less, more preferably 95% by mass or less, and even more preferably 90% by mass or less, relative to the total mass of composition A.

[0043] To achieve the effects described above, the total concentration of the powdered excipients in composition A, more preferably the total concentration of the organic and / or inorganic powdered excipients in composition A, is preferably in the range of 10% to 98% by mass, more preferably 15% to 95% by mass, even more preferably 20% to 90% by mass, even more preferably 25% to 90% by mass, even more preferably 30% to 90% by mass, and even more preferably 55% to 90% by mass, relative to the total mass of composition A.

[0044] Therefore, the disclosure of the present invention also relates to a dyeing product for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising at least compositions A and B. - Composition A comprises a) one or more direct hair dyes and b) one or more alkalizing agents. - Composition B has a pH of 1 to 6 and contains the following general formula NH4: + Y - (However, Y - OH - and CO3 2- An aqueous composition comprising one or more ammonium salts represented by anions other than the above, The total concentration of the oxidizing agent in composition B is 1% by mass or less, preferably 0.1% by mass or less, relative to the total mass of composition B, and more preferably composition B does not contain an oxidizing agent. Composition A is a powder composition, and contains water in an amount of 10% by mass or less, preferably 1% by mass or less, and more preferably 0.1% by mass or less, relative to the total mass of Composition A, and more preferably Composition A is an anhydrous powder composition. Composition A contains one or more powdered excipients, Preferably, the total concentration of the powdered excipients in composition A, more preferably the total concentration of the organic and / or inorganic powdered excipients in composition A, is in the range of 10% to 98% by mass, more preferably 15% to 95% by mass, even more preferably 20% to 90% by mass, even more preferably 25% to 90% by mass, even more preferably 30% to 90% by mass, and even more preferably 55% to 90% by mass, relative to the total mass of composition A. This invention relates to dyed products characterized by the following features.

[0045] In another embodiment of the present invention, composition A is a liquid composition at 25°C and atmospheric pressure, from the viewpoint of dye stability, and comprises one or more organic solvents and less than 10% by mass of water, preferably 1% by mass or less, more preferably 0.1% by mass or less, relative to the total mass of composition A, and more preferably one or more organic solvents, and composition A is anhydrous and liquid at 25°C and atmospheric pressure.

[0046] The term "liquid" refers to the physical state at 25°C and atmospheric pressure; that is, the dye composition is liquid at room temperature.

[0047] In this embodiment of the present invention, the composition may contain one or more organic solvents.

[0048] The organic solvent may be selected to dissolve compound a) in b). Preferred solvents are monovalent, divalent, and trivalent alcohols and / or mixtures thereof.

[0049] From the viewpoint of cosmetic safety and solubility, preferred monovalent, divalent, and trivalent alcohols are ethanol, n-propanol, isopropanol, propylene glycol, ethylene glycol, benzyl alcohol, phenoxyethanol, and glycerol, and / or mixtures thereof.

[0050] From the viewpoint of solution stability, it is even more preferable that the total concentration of the organic solvent in composition A is 75% by mass or more, more preferably 80% by mass or more, and even more preferably 85% by mass or more, based on the total mass of composition A.

[0051] From the viewpoint of staining strength, the total concentration of the organic solvent in composition A is preferably 98% by mass or less, more preferably 95% by mass or less, and even more preferably 92% by mass or less, relative to the total mass of composition A.

[0052] To achieve the effects described above, the total concentration of the organic solvent in composition A is preferably in the range of 75% to 98% by mass, more preferably in the range of 80% to 95% by mass, and even more preferably in the range of 85% to 92% by mass, relative to the total mass of composition A.

[0053] Therefore, the disclosure of the present invention also relates to a dyeing product for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising at least compositions A and B. - Composition A comprises a) one or more direct hair dyes and b) one or more alkalizing agents. - Composition B has a pH of 1 to 6 and contains the following general formula NH4: + Y - (However, Y - OH - and CO3 2- An aqueous composition comprising one or more ammonium salts represented by anions other than the above, The total concentration of the oxidizing agent in composition B is 1% by mass or less, preferably 0.1% by mass or less, relative to the total mass of composition B, and more preferably composition B does not contain an oxidizing agent. Composition A is a liquid composition at 25°C and atmospheric pressure, comprising one or more organic solvents and less than 10% by mass, preferably 1% by mass or less, more preferably 0.1% by mass or less, of water relative to the total mass of composition A, and more preferably, comprising one or more organic solvents, composition A is anhydrous and liquid at 25°C and atmospheric pressure, and preferably the total concentration of the organic solvents in composition A is in the range of 75% to 98% by mass, more preferably 80% to 95% by mass, and even more preferably 85% to 92% by mass, relative to the total mass of composition A.

[0054] In another embodiment of the present invention, composition A is an aqueous composition.

[0055] The term "aqueous" means a composition that contains mostly water, that is, the composition contains water in an amount of preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, and even more preferably 80% by mass or more, based on the total mass of composition A, from the viewpoint of achieving composition A that is acceptable for cosmetic use.

[0056] From the viewpoint of dyeing strength, it is even more preferable that composition A contains water in an amount of 98% by mass or less, more preferably 95% by mass or less, and even more preferably 92% by mass or less, relative to the total mass of composition A.

[0057] To achieve the effects described above, the total concentration of water in composition A is preferably in the range of 50% to 98% by mass, more preferably 60% to 95% by mass, even more preferably 70% to 92% by mass, and still more preferably 80% to 92% by mass, relative to the total mass of composition A.

[0058] From the viewpoint of dyeing performance, the pH of aqueous composition A is preferably 7 or higher, more preferably 7.5 or higher, and even more preferably 8 or higher.

[0059] The pH of aqueous composition A is preferably 12 or less from the viewpoint of hair damage and dyeing performance, more preferably 11.5 or less, and even more preferably 11 or less.

[0060] To achieve the effects described above, the pH of aqueous composition A is preferably in the range of 7 to 12, more preferably in the range of 7.5 to 11.5, and more preferably in the range of 8 to 11.

[0061] Composition B The dyeing product of the present invention has a pH of 1 to 6 and the following general formula NH4 + Y - (However, Y - OH - and CO3 2- Composition B is an aqueous composition containing one or more ammonium salts represented by anions other than the above, The total concentration of the oxidizing agent in composition B is 1% by mass or less, preferably 0.1% by mass or less, relative to the total mass of composition B, and more preferably, composition B does not contain any oxidizing agent.

[0062] From the viewpoint of cosmetic acceptance, it is preferable that the pH of composition B is 1.5 or higher, more preferably 2.0 or higher, and even more preferably 2.5 or higher.

[0063] From a safety standpoint, it is preferable that the pH of composition B is 5.5 or less, more preferably 5.0 or less, and even more preferably 4.5 or less.

[0064] To achieve the effects described above, the pH of composition B is preferably in the range of 1.5 to 5.5, more preferably in the range of 2.0 to 5.0, and even more preferably in the range of 2.5 to 4.5.

[0065] Composition B is a compound listed in group c), with the following general formula NH4 + Y - (However, Y - OH - and CO3 2- It contains one or more ammonium salts represented by anions other than the one specified above.

[0066] Suitable compounds listed in group c) are ammonium sulfate, ammonium chloride, ammonium acetate, ammonium benzoate, ammonium carbamate, ammonium chloride, pentetate (ammonium / iron), ammonium fluoride, ammonium iodide, ammonium bromide, ammonium lactate, ammonium nitrate, ammonium phosphate, diammonium phosphate, triammonium phosphate, ammonium propionate, ammonium sulfite, ammonium thiocyanate, ammonium xylenesulfonate, ammonium citrate, diammonium citrate, triammonium citrate, and / or mixtures thereof.

[0067] From the viewpoint of cosmetic acceptance and safety, the one or more compounds listed in group c) are preferably ammonium sulfate, ammonium chloride, ammonium phosphate, diammonium phosphate, triammonium phosphate, and / or mixtures thereof, and more preferably the one or more compounds listed in group c) are ammonium sulfate.

[0068] From the viewpoint of staining intensity, the total concentration of one or more compounds listed in group c) in composition B is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 0.75% by mass or more, and even more preferably 1% by mass or more, relative to the total mass of composition B.

[0069] From the viewpoint of odor and cosmetic acceptance, the total concentration of one or more compounds listed in group c) in composition B is preferably 15% by mass or less, more preferably 10% by mass or less, even more preferably 8% by mass or less, and even more preferably 6% by mass or less, based on the total mass of composition B.

[0070] To achieve the effects described above, the total concentration of one or more compounds listed in group c) in composition B is preferably in the range of 0.1% to 15% by mass, preferably 0.5% to 10% by mass, more preferably 0.75% to 8% by mass, and even more preferably 1% to 6% by mass, relative to the total mass of composition B.

[0071] Composition A and / or B preferably contain one or more lipophilic compounds as listed in group d) at 25°C and atmospheric pressure, from the viewpoint of user-friendliness and dyeing strength.

[0072] Preferably, one or more compounds described in group d) are C 12 ~C 22 Fatty alcohols, C3~C 22 C of alcohol 12 ~C 22 Esters with fatty acids, C8~C 22 Selected from fatty acids, vegetable oils, and / or silicones, and / or hydrocarbon products, and / or mixtures thereof.

[0073] Appropriate C 12 ~C 22 Fatty alcohols include myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, and cetearyl alcohol, and / or mixtures thereof.

[0074] C3~C 22 C of alcohol 12 ~C 22 Suitable esters with fatty acids are isopropyl myristate, isopropyl palmitate, and myristyl myristate, and / or mixtures thereof.

[0075] Appropriate C8~C 22 Fatty acids include oleic acid, linoleic acid, and palmitic acid, and / or mixtures thereof.

[0076] Suitable vegetable oils are olive oil, almond oil, sunflower oil, and argan oil, and / or mixtures thereof.

[0077] Suitable silicones are non-aminational and / or aminational silicones. The latter is commonly known as amodimethicone.

[0078] From the viewpoint of composition stability and staining intensity, it is preferable that the total concentration of one or more compounds listed in group d) in composition A and / or B is 1% by mass or more, more preferably 2% by mass or more, and even more preferably 3% by mass or more, based on the total mass of each of compositions A and / or B.

[0079] From the viewpoint of forming a stable composition, it is preferable that the total concentration of one or more compounds listed in group d) in composition A and / or B is 20% by mass or less, more preferably 15% by mass or less, and even more preferably 12% by mass or less, based on the total mass of each of compositions A and / or B.

[0080] To achieve the effects described above, the total concentration of one or more compounds in group d) in composition A and / or B is preferably in the range of 1% to 20% by mass, more preferably 2% to 15% by mass, and more preferably 3% to 12% by mass, based on the total mass of each of composition A and / or B.

[0081] Composition B is preferably an oil-in-water emulsion containing one or more compounds described in group d) from the viewpoint of user-friendliness and staining strength.

[0082] From the viewpoint of product stability, it is preferable to keep compositions A and B separate until immediately before applying them to the keratin fibers.

[0083] When compositions A and B are mixed before application to keratin fibers, it is preferable from the viewpoint of dyeing strength that the pH of the ready-to-use composition is 7 or higher, preferably 7.5 or higher, and more preferably 8 or higher.

[0084] When compositions A and B are mixed before application to keratin fibers, it is preferable from the viewpoint of dyeing strength and cosmetic safety that the pH of the ready-to-use composition be 12 or less, preferably 11.5 or less, and more preferably 11 or less.

[0085] To achieve the effects described above, the pH of the ready-to-use composition obtained by mixing compositions A and B is preferably in the range of 7 to 12, more preferably 7.5 to 11.5, and more preferably 8 to 11.

[0086] From the viewpoint of reducing damage, the ready-to-use composition obtained by mixing compositions A and B is more preferably 0.1% by mass or less of an oxidizing agent relative to the total mass of the ready-to-use composition prepared by mixing compositions A and B, and more preferably the ready-to-use composition is free of an oxidizing agent.

[0087] Optional ingredient - Surfactant Compositions A and / or B of the present invention may further contain one or more surfactants, preferably selected from nonionic surfactants, anionic surfactants, cationic surfactants and / or amphoteric / zwitterionic surfactants, and / or mixtures thereof, more preferably selected from anionic surfactants, from the viewpoint of stabilizing the compositions and improving their miscibility with one another.

[0088] Preferably, the anionic surfactant may be selected from ethoxylated or non-ethoxylated alkyl ether sulfate surfactants, alkyl sulfates, ethoxylated and / or non-ethoxylated alkyl carboxylates, ethoxylated or non-ethoxylated amino acid surfactants, and / or mixtures thereof, and / or salts thereof.

[0089] A suitable example is C 10 ~C 22 Alkyl sulfates or preferably ethoxylated alkyl ether sulfate surfactants having an alkyl chain length and a degree of ethoxylation of 1 to 50, or mixtures thereof, and / or salts thereof.

[0090] Suitable nonionic surfactants may be selected from alkyl polyglycosides, ethoxylated triglycerides, ethoxylated fatty alcohols, ethoxylated fatty acid esters, and / or mixtures thereof.

[0091] A suitable cationic surfactant is C 12 ~C 22 A quaternary ammonium surfactant having a carbon chain length in the range of , or a tertiary amine group and C such as an alkylamide alkylamine surfactant. 12 ~C 22 A surfactant having at least one alkyl chain with a carbon chain length in the range of , and / or salts thereof. Suitable examples are cetrimonium chloride and behentrimonium chloride.

[0092] Suitable amphoteric / zwitterionic surfactants are of the betaine type. Suitable compounds can be selected from alkylbetaines and / or alkylamide betaines. A preferred compound selected from alkylbetaines is lauryl betaine. A preferred compound selected from alkylamide betaines is cocamidopropyl betaine. The disclosure also relates to salts of these compounds.

[0093] The appropriate concentration range for the surfactant is 0.1% to 10% by mass relative to the total mass of each of composition A and / or B, from the viewpoint of enhancing the wettability, physical stability, and miscibility with other compositions of the keratin fibers.

[0094] Thickening polymer From the viewpoint of cosmetic safety, it is even more preferable that composition A and / or B of the present invention contain one or more thickening polymers.

[0095] Compositions A and / or B of the present invention may contain one or more thickening polymers selected from nonionic thickening polymers and / or anionic thickening polymers, and / or mixtures thereof.

[0096] Preferably, the thickening polymer is selected from polymers that produce aqueous solutions and / or aqueous dispersions with a pH of 7-12 and a viscosity of at least 1,000 mPa·s, measured at a polymer concentration of 1% by mass relative to the total mass of the composition in water at 25°C under atmospheric pressure, for example, by using a Brookfield viscometer with spindle #4 at 10 rpm for 1 minute at 25°C.

[0097] Suitable nonionic thickening polymers are cellulosic polymers. Suitable examples of cellulosic polymers include methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxyethyl-methylcellulose, and alkylated hydroxycellulose, such as (C2-C8)-alkylcellulose or cetylhydroxyethylcellulose.

[0098] Suitable anionic thickening polymers are selected from naturally derived anionic polymers and / or synthetic anionic polymers.

[0099] Appropriately, natural anionic polymers can be selected from xanthan gum, dehydroxanthan gum, hydroxypropylxanthan gum, carboxymethylcellulose, and starch-based polymers, such as vegetable starch, and / or synthetically modified derivatives thereof, such as hydroxypropyl starch phosphate. Alginic acid, sodium alginate, ammonium alginate, calcium alginate, gum arabic, and guar gum are equally suitable.

[0100] Suitable synthetic anionic polymers include associated thickening polymers, such as acrylates / steareth-30 methacrylate copolymer.

[0101] Preferred thickening polymers for the compositions of the present invention are natural anionic polymers, more preferably xanthan gum and / or dehydroxanthan gum, from the viewpoint of their biodegradability and low environmental impact.

[0102] Preferably, the total concentration of the thickening polymer in composition A and / or B of the present invention is 0.1% by mass or more, more preferably 0.25% by mass or more, and more preferably 0.5% by mass or more, based on the total mass of each of composition A and / or B, from the viewpoint of giving composition A and / or B sufficient viscosity.

[0103] Preferably, the total concentration of the thickening polymer in composition A and / or B of the present invention is 15% by mass or less, more preferably 12% by mass or more, and even more preferably 10% by mass or less, based on the total mass of each of composition A and / or B, from the viewpoint of providing sufficient viscosity to composition A and / or B and product cost.

[0104] To achieve the effects described above, the total concentration of the thickening polymer in composition A and / or B of the present invention is preferably in the range of 0.1% to 15% by mass, more preferably in the range of 0.25% to 12% by mass, and more preferably in the range of 0.5% to 10% by mass, based on the total mass of each of composition A and / or B.

[0105] From the viewpoint of cosmetic safety, compositions A and / or B of the present invention preferably have a viscosity in the range of 1,000 Pas to 25,000 mPa·s, preferably 2,000 mPa·s to 20,000 mPa·s, and more preferably 2,500 mPa·s to 17,500 mPa·s, as determined by a cone-plate viscometer at 25°C under atmospheric pressure. A suitable viscometer is a Brookfield viscometer equipped with spindle #4.

[0106] Dyeing method The present invention also relates to a method for dyeing keratin fibers, preferably human keratin fibers, and more preferably human hair. i) A step of preparing composition A as defined above, ii) A step of preparing composition B as defined above, iii) A step of mixing the compositions from steps i) and ii) immediately before applying them to keratin fibers to obtain a ready-to-use composition having a pH of 7 to 12, iv) A step of applying a ready-to-use composition onto keratin fibers for 1 to 60 minutes, v) Optionally, a step to wash away keratin fibers and This relates to dyeing methods, including those mentioned above.

[0107] From the viewpoint of accelerating staining, the pH of the ready-to-use composition is preferably in the range of 7 to 12, more preferably 7.5 to 11.5, and more preferably 8 to 11.

[0108] Next, the ready-to-use composition is applied to the keratin fibers as defined in step iv) and left for 1 to 60 minutes. The preferred time range for step iv) is 5 to 45 minutes, more preferably 10 to 35 minutes, from the viewpoint of sufficient dyeing.

[0109] Optionally, heat may be applied while the ready-to-use composition is left on the keratin fibers. A suitable temperature range is 30°C to 50°C.

[0110] Use of the composition The present invention also relates to the use of a composition defined as composition B as defined above for enhancing the color intensity and wash fastness of one or more direct dyes on keratin fibers, preferably human keratin fibers, more preferably human hair, wherein composition B is mixed with composition A as defined above immediately before application to the keratin fibers.

[0111] The disclosure of the present invention also includes, <1> A dyeing product for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising at least compositions A and B, - Composition A comprises a) one or more direct hair dyes and b) one or more alkalizing agents. - Composition B has a pH of 1 to 6 and the following general formula: NH4 + Y - (However, Y - OH - and CO3 2- (Anions other than the above) An aqueous composition containing one or more ammonium salts, The total concentration of the oxidizing agent in composition B is 1% by mass or less, preferably 0.1% by mass or less, relative to the total mass of composition B, and more preferably composition B does not contain any oxidizing agent. This invention relates to dyed products characterized by the following features.

[0112] <2> The total concentration of the oxidizing agent in composition A is 1% by mass or less, preferably 0.1% by mass or less, relative to the total mass of composition A, and more preferably, composition A does not contain an oxidizing agent. <1> Products listed in the section.

[0113] <3> The dyed product is characterized by being a non-oxidative dyed product. <1> or <2> Products listed in any of the items.

[0114] <4> One or more compounds in group a) are one or more nonionic direct dyes and / or anionic direct dyes and / or salts thereof, and / or mixtures thereof, preferably one or more compounds in group a) are Acid Black 1, Acid Blue 1, Acid Blue 3, Food Blue 5, Acid Blue 7, Acid Blue 9, Acid Blue 74, Acid Orange 3, Acid Orange 6, Acid Orange 7, Acid Orange 10, Acid Red 1, Acid Red 14, Acid Red 18, Acid Red 27, Acid Red 50, Acid Red 52, Acid Red 73, Acid Red 87, Acid Red 88, Acid Red 92, Acid Red 155, Acid Red 180, Acid Violet 9, Acid Violet 43, Acid Violet 49, Acid Yellow 1, Acid Yellow 23, Acid Yellow 3, Food Yellow No.8, D&C Brown No.1, D&C Green No.5, D&C Green No.8, D&C Orange No.4, D&C Orange No.10, D&C Orange No.11, D&C Red No.21, D&C Red No.27, D&C Red No.33, D&C Violet 2, D&C Yellow No.7, D&C Yellow No.8, D&C Yellow No.10, FD&C Red 2, FD&C Red 40, FD&C Red No.4, FD&C Yellow No.6, FD&C Blue 1, Food Black 1, Food Black 2, Disperse Black 9, Disperse Violet 1, Acid Red 52, DC Violet 2, DC Red 33, DC Orange 4, DC Red 27, DC Yellow 10, HC Blue 18, HC Red 18, HC Yellow 16, Basic Blue 6, Basic Blue 7, Basic Blue 9, Basic Blue 26, Basic Blue 41, Basic Blue 99, Basic Brown 4, Basic Brown 16, Basic Brown 17, Natural Brown 7, Basic Green 1, Basic Red 2, Basic Red 12, Basic Red 22, Basic Red 76, Basic Violet 1, Basic Violet 2, Basic Violet 3, Basic Violet 10, Basic Violet 14, Basic Yellow 57, Basic Red 51, Basic Yellow 87, HC Blue 17 and Basic Orange 31, preferably Basic Red 51, Basic Yellow 87, Basic Orange 31, HC Blue 17 and Basic Blue 124, HC Blue No.2, HC Blue No.4, HC Blue No.5, HC Blue No.6, HC Blue No.7, HC Blue No.8, HC Blue No.9, HC Blue No.10, HC Blue No.11, HC Blue No.12, HC Blue No.13, HC Brown No.1, HC Brown No.2, HC Green No.1, HC Orange No.1, HC Orange No.2, HC Orange No.3, HC Orange No.5, HC Red BN, HC Red No.1, HC Red No.3, HC Red No.7, HC Red No.8, HC Red No.9, HC Red No.10, HC Red No.11, HC Red No.13, HC Red No.54, HC Red No.14, characterized by being HC Violet BS, HC Violet No. 1, HC Violet No. 2, HC Yellow No. 2, HC Yellow No. 4, HC Yellow No. 5, HC Yellow No. 6, HC Yellow No. 7, HC Yellow No. 8, HC Yellow No. 9, HC Yellow No. 10, HC Yellow No. 11, HC Yellow No. 12, HC Yellow No. 13, HC Yellow No. 14, HC Yellow No. 15, HC Blue 18, HC Red 18, HC Yellow 16, Disperse Black 9, Acid Yellow 1, and / or salts thereof, and / or mixtures thereof, <1> ~ <3> Products listed in any of the items.

[0115] <5> The one or more compounds described in group a) are selected from HC Blue 18, HC Red 18, HC Yellow 16, Disperse Black 9, Acid Yellow 1, and / or salts thereof, and / or mixtures thereof. <1> ~ <4> Products listed in any of the items.

[0116] <6> The present invention is characterized in that one or more compounds described in group a) are selected from HC Blue 18, HC Red 18, HC Yellow 16, and / or salts thereof, and / or mixtures thereof. <1> ~ <5> Products listed in any of the items.

[0117] <7> The total concentration of one or more compounds listed in group a) in composition A is in the range of 0.05% to 15% by mass, preferably 0.1% to 12% by mass, and more preferably 0.25% to 10% by mass, relative to the total mass of composition A. <1> ~ <6> Products listed in any of the items.

[0118] <8> The one or more compounds described in group b) are selected from one or more organic alkalizing agents and / or salts thereof, and / or ammonium hydroxide. <1> ~ <7> Products listed in any of the items.

[0119] <9> The one or more compounds listed in group b) are selected from monoethanolamine, diethanolamine, monoethanolmethylamine, monoethanoldimethylamine, diethanolmethylamine, monoethanolethylamine, monoethanoldiethylamine, diethanolethylamine, monoethanolpropylamine, monoethanoldipropylamine, diethanolpropylamine, monoethanolbutylamine, diethanolbutylamine, trimethylamine, triethylamine, 2-amino-2-methylpropanol, tris-(hydroxymethyl)-aminomethane, ammonium hydroxide, and / or mixtures thereof. <1> ~ <8> Products listed in any of the items.

[0120] <10> The one or more compounds described in group b) are selected from monoethanolamine, 2-amino-2-methylpropanol, tris-(hydroxymethyl)-aminomethane, ammonium hydroxide, and / or mixtures thereof. <1> ~ <9> Products listed in any of the items.

[0121] <11> The total concentration of one or more compounds listed in group b) in composition A is in the range of 0.1% to 30% by mass, preferably 0.25% to 25% by mass, and more preferably 0.5% to 20% by mass, relative to the total mass of composition A. <1> ~ <10> Products listed in any of the items.

[0122] <12> Composition A is a powder composition, and contains water in an amount of 10% by mass or less, preferably 1% by mass or less, and more preferably 0.1% by mass or less, relative to the total mass of composition A, and more preferably composition A is an anhydrous powder composition. <1> ~ <11> Products listed in any of the items.

[0123] <13> Composition A is characterized by containing one or more organic and / or inorganic powdered excipients. <12> Products listed in the section.

[0124] <14> The invention is characterized in that one or more organic and / or inorganic powdered excipients are diatomaceous earth, kaolin, bentonite, one or more starches, such as corn, tapioca, rice, wheat, and potato, nylon powder, montmorillonite, gypsum, sawdust, and perlite, and more preferably cornstarch. <12> and / or <13> Products listed in any of the items.

[0125] <15> The total concentration of the powdered excipients in composition A, more preferably the total concentration of the organic and / or inorganic powdered excipients in composition A, is in the range of 10% to 98% by mass, more preferably 15% to 95% by mass, even more preferably 20% to 90% by mass, even more preferably 25% to 90% by mass, even more preferably 30% to 90% by mass, and even more preferably 55% to 90% by mass, based on the total mass of composition A. <12> ~ <14> Products listed in any of the items.

[0126] <16> Composition A is a liquid composition at 25°C and atmospheric pressure comprising one or more organic solvents and less than 10% by mass of water, preferably 1% by mass or less, and more preferably 0.1% by mass or less, relative to the total mass of Composition A, and more preferably, Composition A comprising one or more organic solvents is anhydrous and liquid at 25°C and atmospheric pressure. <1> ~ <11> Products listed in any of the items.

[0127] <17> Composition A is characterized in that one or more organic solvents are monohydric, dihydric, and trihydric alcohols, and / or mixtures thereof. <16> Products listed in the section.

[0128] <18> The invention is characterized in that one or more organic solvents are ethanol, n-propanol, isopropanol, propylene glycol, ethylene glycol, benzyl alcohol, phenoxyethanol, and glycerol, and / or mixtures thereof. <16> ~ <17> Products listed in any of the items.

[0129] <19> The total concentration of the organic solvent in composition A is in the range of 75% to 98% by mass, more preferably 80% to 95% by mass, and even more preferably 85% to 92% by mass, relative to the total mass of composition A. <16> ~ <18> Products listed in any of the items.

[0130] <20> Composition A is characterized by being an aqueous composition having a pH in the range of 7 to 12, preferably in the range of 7.5 to 11.5, and more preferably in the range of pH 8 to 11. <1> ~ <11> Products listed in any of the items.

[0131] <21> Composition A is characterized by containing water in an amount of 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, and even more preferably 80% by mass or more, relative to the total mass of Composition A. <1> ~ <11> and / or <20> Products listed in any of the items.

[0132] <22> The one or more compounds listed in group c) are characterized by being ammonium sulfate, ammonium chloride, ammonium acetate, ammonium benzoate, ammonium carbamate, ammonium chloride, pentetate (ammonium / iron), ammonium fluoride, ammonium iodide, ammonium bromide, ammonium lactate, ammonium nitrate, ammonium phosphate, diammonium phosphate, triammonium phosphate, ammonium propionate, ammonium sulfite, ammonium thiocyanate, ammonium xylenesulfonate, ammonium citrate, diammonium citrate, triammonium citrate, and / or mixtures thereof. <1> ~ <21> Products listed in any of the items.

[0133] <23> The one or more compounds described in group c) are characterized in that they are ammonium sulfate, ammonium chloride, ammonium phosphate, diammonium phosphate, triammonium phosphate, and / or mixtures thereof. <1> ~ <22> Products listed in any of the items.

[0134] <24> The compound described in group c) is characterized in that one or more of the compounds is ammonium sulfate. <1> ~ <23> Products listed in any of the items.

[0135] <25> The total concentration of one or more compounds listed in group c) in composition B is in the range of 0.1% to 15% by mass, preferably 0.5% to 10% by mass, more preferably 0.75% to 8% by mass, and even more preferably 1% to 6% by mass, relative to the total mass of composition B. <1> ~ <24> Products listed in any of the items.

[0136] <26> Composition B contains one or more lipophilic compounds as listed in group d) at 25°C and atmospheric pressure, preferably one or more compounds as listed in group d), C 12 ~C 22 Fatty alcohols, C3~C 22 C of alcohol 12 ~C 22 Esters with fatty acids, C8~C 22 A composition B is characterized by being selected from fatty acids, vegetable oils and / or silicones and / or hydrocarbon products, and / or mixtures thereof, and more preferably a water-in-oil emulsion containing one or more compounds described in group d), <1> ~ <25> Products listed in any of the items.

[0137] <27> The ready-to-use composition obtained by mixing compositions A and B is characterized in that its pH is in the range of 7 to 12, preferably 7.5 to 11.5, and more preferably 8 to 11. <1> ~ <25> Products listed in any of the items.

[0138] This disclosure also, <28> It has a pH of 1 to 6, and c) <1> ~ <27> An aqueous composition C for dyeing keratin fibers, preferably human keratin fibers, more preferably human hair, comprising one or more ammonium salts as defined in any of the items, wherein the total concentration of the one or more compounds described in group c) is 0.5% by mass or more, preferably 0.75% by mass or more, more preferably 1% by mass or more, based on the total mass of composition C. The present invention relates to an aqueous composition C, which contains 1% by mass or less of an oxidizing agent, preferably 0.1% by mass or less of an oxidizing agent, based on the total mass of composition C, and more preferably, composition C does not contain an oxidizing agent.

[0139] This disclosure also, <29> A method for dyeing keratin fibers, preferably human keratin fibers, more preferably human hair, i) <1> ~ <27> A step of preparing composition A as defined in any of the items, ii) <1> ~ <27> Composition B as defined in any of the items or <28> The steps include preparing composition C as defined in the section, iii) A step of mixing the compositions from steps i) and ii) immediately before applying them to keratin fibers to obtain a ready-to-use composition having a pH of 7 to 12, iv) A step of applying a ready-to-use composition onto keratin fibers for 1 to 60 minutes, v) Optionally, a step to wash away keratin fibers and This includes methods.

[0140] This disclosure also, <30> For enhancing the color intensity and wash fastness of one or more direct dyes on keratin fibers, preferably human keratin fibers, more preferably human hair, <1> ~ <27> A composition defined as composition B in any of the items or <28> The use of composition C as defined in the section, wherein composition B or C is applied immediately before application to keratin fibers. <1> ~ <27> This relates to the use of a composition, which is mixed with composition A as defined in any of the clauses.

[0141] The following examples are intended to illustrate the present invention and are not intended to limit it. [Examples]

[0142] [Table 1]

[0143] [Table 2]

[0144] The composition of the present invention yielded better staining strength and wash fastness than a comparative counterpart in which composition B does not contain an ammonium salt.

[0145] [Table 3]

[0146] [Table 4]

[0147] method Hair dyeing Goat hair bundles (21 cm, 2 g per bundle) were permed for 20 minutes using a commercially available perming product under the brand name Goldwell Topform Type 1, rinsed, and then treated with an oxidizing composition for 10 minutes to set the perm. The bundles were then washed with shampoo and dried.

[0148] The dyed products from the above were prepared by mixing compositions A and B in a mass ratio of 1:1 to create a ready-to-use composition having a pH of 10.0 to 10.5.

[0149] Two grams of the ready-to-use composition was applied to a bundle of permed goat hair at 30°C for 30 minutes. The bundle was then rinsed and dried. Colorimetric data was measured using a colorimeter (Datacolor Mercury Check II Plus) and analyzed using the CIE color system (L). * ,a * ,b * The result was obtained using the following formula. The color difference (ΔE) was calculated using the following formula.

[0150]

number

[0151] ΔΔE is the color difference between hair that has just been colored and hair that has been washed 20 times, as described below.

[0152] Wash fastness A 1g sample of Goldwell Dualsenses Color Fade Stop Shampoo (a commercially available shampoo) was applied to a dyed hair strand and lathered with lukewarm water for 30 seconds. The hair strand was then rinsed. This process was repeated 20 times. After treatment, the hair strand was dried with a hairdryer, and the remaining color was measured (L). * ,a * ,b * ΔΔE was calculated as the color difference between hair that had been washed 20 times and hair that had just been colored.

Claims

1. A dyeing product for keratin fibers, preferably human keratin fibers, more preferably human hair, comprising at least compositions A and B, - Composition A comprises a) one or more direct hair dyes and b) one or more alkalizing agents. - Composition B has a pH of 1 to 6 and the following general formula: NH 4 + Y - (However, Y - is OH - and CO 3 2- (Anions other than the above) It is an aqueous composition containing one or more ammonium salts, The total concentration of the oxidizing agent in composition B is 1% by mass or less, preferably 0.1% by mass or less, relative to the total mass of composition B, and more preferably composition B does not contain an oxidizing agent. A dyed product characterized by the following features.

2. The product according to claim 1, characterized in that the total concentration of the oxidizing agent in composition A is 1% by mass or less, preferably 0.1% by mass or less, relative to the total mass of composition A, more preferably composition A does not contain an oxidizing agent, and more preferably the dyed product is a non-oxidative dyed product.

3. One or more compounds described in group a) are selected from nonionic direct dyes and / or anionic direct dyes and / or salts thereof, and / or mixtures thereof, preferably one or more compounds described in group a) are Acid Black 1, Acid Blue 1, Acid Blue 3, Food Blue 5, Acid Blue 7, Acid Blue 9, Acid Blue 74, Acid Orange 3, Acid Orange 6, Acid Orange 7, Acid Orange 10, Acid Red 1, Acid Red 14, Acid Red 18, Acid Red 27, Acid Red 50, Acid Red 52, Acid Red 73, Acid Red 87, Acid Red 88, Acid Red 92, Acid Red 155, Acid Red 180, Acid Violet 9, Acid Violet 43, Acid Violet 49, Acid Yellow 1, Acid Yellow 23, Acid Yellow 3, Food Yellow No.

8. D&C Brown No.

1. D&C Green No.

5. D&C Green No. 8, D&C Orange No.

4. D&C Orange No. 10, D&C Orange No. 11, D&C Red No. 21, D&C Red No. 27, D&C Red No. 33, D&C Violet 2, D&C Yellow No.

7. D&C Yellow No.

8. D&C Yellow No. 10, FD&C Red 2, FD&C Red 40, FD&C Red No. 4.FD&C Yellow No. 6, FD&C Blue 1, Food Black 1, Food Black 2, Disperse Black 9, Disperse Violet 1, Acid Red 52, DC Violet 2, DC Red 33, DC Orange 4, DC Red 27, DC Yellow 10, HC Blue 18, HC Red 18, HC Yellow 16, Basic Blue 6, Basic Blue 7, Basic Blue 9, Basic Blue 26, Basic Blue 41, Basic Blue99, Basic Brown 4, Basic Brown 16, Basic Brown 17, Natural Brown 7, Basic Green 1, Basic Red 2, Basic Red 12, Basic Red 22, Basic Red 76, Basic Violet 1, Basic Violet 2, Basic Violet 3, Basic Violet 10, Basic Violet 14, Basic Yellow 57, Basic Red 51, Basic Yellow 87, HC Blue 17 and Basic Orange 31, and preferably one or more compounds described in group a) are one or more of Basic Red 51, Basic Yellow 87, Basic Orange 31, HC Blue 17 and Basic Blue 124, HC Blue No. 2, HC Blue No. 4, HC Blue No. 5, HC Blue No. 6, HC Blue No. 7, HC Blue No. 8, HC Blue No. 9, HC Blue No. 10, HC Blue No. 11, HC Blue No. 12, HC Blue No. 13, HC Brown No. 1, HC Brown No. 2, HC Green No. 1, HC Orange No. 1, HC Orange No. 2, HC Orange No. 3, HC Orange No. 5, HC Red BN, HC Red No. 1, HC Red No. 3, HC Red No. 7, HC Red No. 8, HC Red No. 9, HC Red No. 10, HC Red No. 11, HC Red No. 13, HC Red No. 54, HC Red No. 14, HC Violet BS, HC Violet No. 1, HC Violet No. 2, HC Yellow No. 2, HC Yellow No. 4, HC Yellow No. 5, HC Yellow No. 6, HC Yellow No. 7, HC Yellow No. 8, HC Yellow No. 9, HC Yellow No. 10, HC Yellow No. 11, HC Yellow No. 12, HC Yellow No. 13, HC Yellow No. 14, HCThe product according to claim 1 or 2, characterized in that Yellow No. 15, HC Blue 18, HC Red 18, HC Yellow 16, Disperse Black 9, Acid Yellow 1, and / or salts thereof, and / or mixtures thereof, more preferably one or more compounds from group a) are selected from HC Blue 18, HC Red 18, HC Yellow 16, Disperse Black 9, Acid Yellow 1, and / or salts thereof, and / or mixtures thereof, and even more preferably one or more compounds from group a) are selected from HC Blue 18, HC Red 18, HC Yellow 16, and / or salts thereof, and / or mixtures thereof.

4. The product according to any one of claims 1 to 3, characterized in that the total concentration of one or more compounds listed in group a) in composition A is in the range of 0.05% to 15% by mass, preferably in the range of 0.1% to 12% by mass, and more preferably in the range of 0.25% to 10% by mass, based on the total mass of composition A.

5. The product according to any one of claims 1 to 4, characterized in that one or more compounds in group b) are selected from one or more organic alkalizing agents and / or salts thereof, and / or ammonium hydroxide, preferably one or more compounds in group b) are one or more alkanolamines and / or salts thereof, and / or ammonium hydroxide, more preferably one or more compounds in group b) are selected from monoethanolamine, diethanolamine, monoethanolmethylamine, monoethanoldimethylamine, diethanolmethylamine, monoethanolethylamine, monoethanoldiethylamine, diethanolethylamine, monoethanolpropylamine, monoethanoldipropylamine, diethanolpropylamine, monoethanolbutylamine, diethanolbutylamine, trimethylamine, triethylamine, 2-amino-2-methylpropanol, tris-(hydroxymethyl)-aminomethane, ammonium hydroxide, and / or mixtures thereof, and most preferably one or more compounds in group b) are selected from monoethanolamine, 2-amino-2-methylpropanol, tris-(hydroxymethyl)-aminomethane, ammonium hydroxide, and / or mixtures thereof.

6. The product according to any one of claims 1 to 5, characterized in that the total concentration of one or more compounds listed in group b) in composition A is in the range of 0.1% to 30% by mass, preferably in the range of 0.25% to 25% by mass, and more preferably in the range of 0.5% to 20% by mass, based on the total mass of composition A.

7. The product according to any one of claims 1 to 6, characterized in that composition A is a powder composition, and contains water in an amount of 10% by mass or less, preferably 1% by mass or less, and more preferably 0.1% by mass or less, relative to the total mass of composition A, and more preferably composition A is an anhydrous powder composition.

8. The product according to any one of claims 1 to 6, wherein composition A is a liquid composition at 25°C and atmospheric pressure comprising one or more organic solvents and less than 10% by mass of water, preferably 1% by mass or less of water, more preferably 0.1% by mass or less of water relative to the total mass of composition A, and more preferably, composition A comprising one or more organic solvents is anhydrous and liquid at 25°C and atmospheric pressure.

9. The product according to any one of claims 1 to 6, characterized in that composition A is an aqueous composition having a pH of 7 to 12, preferably 7.5 to 11.5, more preferably 8 to 11.

10. The product according to any one of claims 1 to 9, characterized in that one or more compounds listed in group c) are ammonium sulfate, ammonium chloride, ammonium acetate, ammonium benzoate, ammonium carbamate, ammonium chloride, pentetate (ammonium / iron), ammonium fluoride, ammonium iodide, ammonium bromide, ammonium lactate, ammonium nitrate, ammonium phosphate, diammonium phosphate, triammonium phosphate, ammonium propionate, ammonium sulfite, ammonium thiocyanate, ammonium xylenesulfonate, ammonium citrate, diammonium citrate, triammonium citrate, and / or mixtures thereof, preferably one or more compounds listed in group c) are ammonium sulfate, ammonium chloride, ammonium phosphate, diammonium phosphate, triammonium phosphate, and / or mixtures thereof, and more preferably one or more compounds listed in group c) are ammonium sulfate.

11. The product according to any one of claims 1 to 10, characterized in that the total concentration of one or more compounds in group c) in composition B is in the range of 0.1% to 15% by mass, preferably 0.5% to 10% by mass, more preferably 0.75% to 8% by mass, and even more preferably 1% to 6% by mass, based on the total mass of composition B.

12. The product according to any one of claims 1 to 11, characterized in that the pH of the ready-to-use composition obtained by mixing compositions A and B is in the range of 7 to 12, preferably in the range of 7.5 to 11.5, and more preferably in the range of 8 to 11.

13. The product according to any one of claims 1 to 12, characterized in that composition A and composition B have a mixed mass ratio in the range of 0.1 to 10, preferably in the range of 0.2 to 5, more preferably in the range of 0.3 to 3, and more preferably in the range of 1.

14. A method for dyeing keratin fibers, preferably human keratin fibers, more preferably human hair, i) A step of preparing composition A as defined in any one of claims 1 to 13, ii) A step of preparing composition B as defined in any one of claims 1 to 13, iii) A step of mixing the compositions from steps i) and ii) immediately before applying them to keratin fibers to obtain a ready-to-use composition having a pH of 7 to 12, iv) A step of applying a ready-to-use composition onto keratin fibers for 1 to 60 minutes, v) Optionally, a step to wash away keratin fibers and Methods that include...

15. Use of a composition defined as composition B in any of claims 1 to 13 for enhancing the color intensity and wash fastness of one or more direct dyes on keratin fibers, preferably human keratin fibers, more preferably human hair, wherein composition B is mixed with composition A as defined in any of claims 1 to 13 immediately before application to the keratin fibers.

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