One-pack-type hair dye composition

Abstract

Provided is a one-pack-type hair dye composition in which it is possible to stably blend a prescribed melanin precursor with a specific direct dye, and as a result, to realize various color expressions of hair, and that also produces a good hair feel after treatment.　Specifically, the present invention provides a one-pack-type hair dye composition containing the following components (A) to (E): (A) a compound represented by the following formula (1) or a salt thereof (in formula (1), the broken line indicates the presence or absence of a π bond, R1 represents a hydroxy group or an acetoxy group, R2 represents a hydrogen atom or -COOR (where R is a hydrogen atom, a methyl group, or an ethyl group), and R3 represents a hydrogen atom, an acetyl group, a methyl group, or an ethyl group), (B) a neutral or anionic direct dye, (C) an alkaline agent, (D) a nonionic surfactant, and (E) a cationic surfactant. The ratio (D) / (B) of the contained mass of the component (D) to the contained mass of the component (B) is 3.0-30.0, and the pH is 8.0-11.0.

Description

One-part hair dye composition

[0001] The present invention relates to a one-part hair dye composition.

[0002] Since hair color is expressed by the amount and ratio of melanin pigment, dyeing hair with melanin pigment is expected to produce a more natural finish, and much research has been conducted on this. In particular, hair dye compositions using dihydroxyindole, a precursor of eumelanin, and its derivatives have been studied. However, since eumelanin is a dark brown color, it is necessary to use other dyes to express a variety of hair colors using this.

[0003] Patent Document 1 describes a multi-component hair dye that is composed of (A) an acidic agent containing a melanin precursor and (B) a reducing agent, and (C) an alkaline agent containing an alkaline agent, and at least one of the components contains (D) a nonionic or anionic direct dye, and that the components are applied to hair simultaneously; the air oxidation hair dye has a total alkalinity of a specific value or less when the components are mixed, and that prevents the melanin precursor from polymerizing before use, and that sufficient hair dyeing power can be obtained by applying the components simultaneously.

[0004] (Patent Document 1) JP 2023-184460 A

[0005] The present invention relates to the following: [1] The following components (A) to (E): (A) a compound represented by the following formula (1) or a salt thereof: (In formula (1), the dashed line indicates the presence or absence of a π bond. R １ represents a hydroxyl group or an acetoxy group. ２ represents a hydrogen atom or -COOR (wherein R is a hydrogen atom, a methyl group, or an ethyl group). ３ represents a hydrogen atom, an acetyl group, a methyl group, or an ethyl group.) A one-part hair dye composition containing (B) a neutral or anionic direct dye, (C) an alkali agent, (D) a nonionic surfactant, and (E) a cationic surfactant, wherein the ratio (D) / (B) of the mass content of component (D) to the mass content of component (B) is 3.0 or more and 30.0 or less, and the pH is 8.0 or more and 11.0 or less. [2] A method for dyeing hair by applying the one-part hair dye composition according to [1] above to hair.

[0006] However, the hair dye described in Patent Document 1, which uses a mixture of multiple agents, is complicated and there is a risk of the mixing ratio being off when mixing the multiple agents. Therefore, a one-component hair dye that can achieve a variety of hair color expressions is desired, but in the presence of a melanin precursor, the air oxidation of the melanin derivative proceeds rapidly, causing a polymerization reaction outside the hair, and the polymerized pigment is adsorbed on the hair surface, which may cause the hair to feel inferior. Furthermore, in the case of an air oxidation hair dye such as a melanin precursor, if the composition is made alkaline to achieve high hair dyeing properties, the reaction tends to proceed in the composition and is affected by small amounts of dissolved oxygen, making it very difficult to stably formulate it into a one-component formula.

[0007] The present invention aims to provide a one-part hair dye composition that can stably combine a specific melanin precursor and a specific direct dye in a one-part hair dye, thereby achieving a wide variety of hair color expressions that cannot be achieved with the specific melanin precursor alone, and that leaves hair feeling good after treatment.The present inventors have found that the above-mentioned problems can be solved by a one-part hair dye composition that contains a specific melanin precursor, a specific direct dye, and a nonionic surfactant in a specific ratio.

[0008] According to the one-part hair dye composition of the present invention, a predetermined melanin precursor and a specific direct dye can be stably blended, and as a result, a one-part hair dye composition is provided which can realize a wide variety of hair color expressions and further leaves hair with a good feel after treatment. Detailed Description of the Invention

[0009] [One-Part Hair Dye Composition] The one-part hair dye composition of the present invention comprises the following components (A) to (D): (A) a compound represented by the following formula (1) or a salt thereof: (In formula (1), the dashed line indicates the presence or absence of a π bond. R １ represents a hydroxyl group or an acetoxy group. ２ represents a hydrogen atom or -COOR (wherein R is a hydrogen atom, a methyl group, or an ethyl group). ３represents a hydrogen atom, an acetyl group, a methyl group, or an ethyl group.) The composition contains (B) a neutral or anionic direct dye, (C) an alkali agent, and (D) a nonionic surfactant, and the ratio (D) / (B) of the mass content of component (D) to the mass content of component (B) is 3.0 or more and 30.0 or less, and the pH is 8.0 or more and 11.0 or less. In the following description, the one-part hair dye composition may be simply referred to as the "composition."

[0010] The one-part hair dye composition of the present invention has the above-mentioned constitution, and as a result, it is possible to provide a one-part hair dye composition that can stably blend a predetermined melanin precursor and a specific direct dye, thereby realizing a wide variety of hair color expressions and providing hair with a pleasant feel after treatment. [Definition] As used herein, the phrase "capable of realizing a wide variety of color expressions" means that the stable blending of a predetermined melanin precursor and a specific direct dye makes it possible to produce colors that would be difficult to produce with the predetermined melanin precursor alone.

[0011] The reason why the composition of the present invention exhibits the above-mentioned effects is unclear, but is presumed to be as follows. Component (B) contributes to the expression of a wide variety of hair colors. Component (C) swells the hair and opens the cuticle, allowing dye components such as components (A) and (B) to penetrate deep into the hair, while accelerating the polymerization reaction of component (A), improving hair dyeability. Component (D) contributes to the stable blending of dye components such as components (A) and (B). If the amount of component (D) is too small, the stability of components (A) and (B) decreases and aggregates form, while if the amount of component (D) is too large, the feel of the hair after treatment tends to deteriorate. Therefore, by setting the ratio of the mass content of component (D) to the mass content of component (B) [(D) / (B)] within a specific range, components (A) and (B) can be stably blended while component (E) contributes to improving the feel of the hair. As a result, it is possible to provide a one-part hair dye composition that can achieve a wide variety of hair color expressions and that leaves hair feeling good after treatment. Although too much component (E) tends to reduce hair dyeing properties, by setting the ratio of the mass of component (E) to the mass of component (B) [(E) / (B)] within a specific range, it is possible to achieve even better hair dyeing properties and color expressions.

[0012] In the present invention, examples of the one-component hair dye composition include hair cleansers such as shampoos, rinses, conditioning agents, treatments, styling agents, hair dyes, and hair growth agents. Among these, hair cosmetics selected from the group consisting of rinses, conditioning agents, and treatments are preferred. The formulation of the one-component hair dye composition is not particularly limited, and any formulation may be used, for example, a liquid, foam, paste, cream, solid, powder, or the like. From the viewpoint of ease of application to hair, the composition is preferably in the form of a liquid, foam, paste, or cream.

[0013] <Component (A)> The one-part hair dye composition of the present invention contains component (A), which is a compound represented by the following formula (1) or a salt thereof. Component (A) is a melanin precursor that is polymerized by air oxidation and converted into a melanin pigment, and acts as a hair dye. (In formula (1), the dashed line indicates the presence or absence of a π bond. R １ represents a hydroxyl group or an acetoxy group. ２ represents a hydrogen atom or -COOR (wherein R is a hydrogen atom, a methyl group, or an ethyl group). ３ represents a hydrogen atom, an acetyl group, a methyl group, or an ethyl group.) The melanin precursor of component (A) is an indole derivative or an indoline derivative, which is a compound represented by formula (1), or a salt thereof, and one or a combination of two or more thereof can be used in the present invention. From the viewpoint of hair dyeing ability, component (A) is more preferably an indole derivative (i.e., a π bond is present at the dashed line portion in formula (1)). From the viewpoint of availability and hair dyeing ability of component (A), in formula (1), R １ is preferably a hydroxyl group, and R ２ is preferably a hydrogen atom or —COOR (R is a hydrogen atom, a methyl group, or an ethyl group), and more preferably a hydrogen atom or —COOH. ３ is preferably a hydrogen atom.

[0014] Examples of the compound represented by formula (1) include 5,6-dihydroxyindole, 5,6-dihydroxyindole-2-carboxylic acid, methyl 5,6-dihydroxyindole-2-carboxylate, ethyl 5,6-dihydroxyindole-2-carboxylate, N-methyl-5,6-dihydroxyindole, N-methyl-5,6-dihydroxyindole-2-carboxylic acid, N-ethyl-5,6-dihydroxyindole, N-ethyl-5,6-dihydroxyindole-2-carboxylic acid, N-acetyl-5,6-dihydroxyindole, N-acetyl-5,6-dihydroxyindole-2-carboxylic acid, 5-acetoxy-6-hydroxyindole, 5-acetoxy-6-hydroxyindole-2-carboxylic acid, Examples thereof include carboxylic acid, 5,6-dihydroxyindoline, 5,6-dihydroxyindoline-2-carboxylic acid, methyl 5,6-dihydroxyindoline-2-carboxylate, ethyl 5,6-dihydroxyindoline-2-carboxylate, N-methyl-5,6-dihydroxyindoline, N-methyl-5,6-dihydroxyindoline-2-carboxylic acid, N-ethyl-5,6-dihydroxyindoline, N-ethyl-5,6-dihydroxyindoline-2-carboxylic acid, N-acetyl-5,6-dihydroxyindoline, N-acetyl-5,6-dihydroxyindoline-2-carboxylic acid, 5-acetoxy-6-hydroxyindoline, and 5-acetoxy-6-hydroxyindoline-2-carboxylic acid.

[0015] Examples of the salt of the compound represented by formula (1) include hydrochloride, hydrobromide, sulfate, phosphate, acetate, propionate, lactate, citrate, etc. of the compound, and among these, hydrobromide is preferred from the viewpoint of availability. ２ is —COOH, the salt of the compound represented by formula (1) may be a carboxylate thereof (R ２ Ga-COO － X ＋ (X ＋ is Na ＋ , K. ＋ and cations such as ammonium ion).

[0016] From the viewpoint of improving hair dyeability and dyeing hair in a natural color, it is preferable that component (A) contains one or more selected from the group consisting of 5,6-dihydroxyindole, 5,6-dihydroxyindole-2-carboxylic acid, 5,6-dihydroxyindoline, 5,6-dihydroxyindoline-2-carboxylic acid, and salts thereof, it is more preferable that component (A) contains one or more selected from the group consisting of 5,6-dihydroxyindole, 5,6-dihydroxyindole-2-carboxylic acid, and 5,6-dihydroxyindoline hydrobromide, and it is even more preferable that component (A) contains one or more selected from the group consisting of 5,6-dihydroxyindole and 5,6-dihydroxyindole-2-carboxylic acid. When 5,6-dihydroxyindole and 5,6-dihydroxyindole-2-carboxylic acid are used in combination, the molar ratio (5,6-dihydroxyindole:5,6-dihydroxyindole-2-carboxylic acid) is preferably in the range of 50:50 to 99:1, more preferably in the range of 80:20 to 99:1, and even more preferably in the range of 85:15 to 95:5. When the molar ratio of 5,6-dihydroxyindole to 5,6-dihydroxyindole-2-carboxylic acid is in the above range, hair dyeability is improved and the finished hair color after dyeing approaches a more natural color. The molar ratio of 5,6-dihydroxyindole to 5,6-dihydroxyindole-2-carboxylic acid can be quantified by reverse-phase HPLC.

[0017] The content of component (A) in the one-part hair dye composition is preferably 0.05% by mass or more, more preferably 0.07% by mass or more, even more preferably 0.10% by mass or more, and even more preferably 0.20% by mass or more from the viewpoint of improving hair dyeability, and is preferably 0.50% by mass or less, more preferably 0.45% by mass or less, even more preferably 0.40% by mass or less, and even more preferably 0.35% by mass or less from the viewpoint of diverse hair color expression. The content of component (A) in the one-part hair dye composition is preferably 0.05 to 0.50% by mass, more preferably 0.07 to 0.45% by mass, even more preferably 0.10 to 0.40% by mass, and even more preferably 0.20 to 0.35% by mass.

[0018] <Component (B)> The one-part hair dye composition of the present invention contains a neutral or anionic direct dye as component (B). Examples of neutral dyes include HC Blue 2, HC Blue 4, HC Blue 5, HC Blue 6, HC Blue 7, HC Blue 8, HC Blue 9, HC Blue 10, HC Blue 11, HC blue 12, HC blue 13, HC brown 1, HC brown 2, HC green 1, HC orange 1, HC orange 2, HC orange 3, HC orange 5, HC red BN, HC red 1, HC Red 3, HC Red 7, HC Red 8, HC Red 9, HC Red 10, HC Red 11, HC Red 13, HC Red 54, HC Red 14, HC Purple BS, HC Purple 1, HC purple 2, HC yellow 2, HC yellow 4, HC yellow 5, HC yellow 6, HC yellow 7, HC yellow 8, HC yellow 9, HC yellow 10, HC yellow 11, HC yellow 12, HC Yellow 13, HC Yellow 14, HC Yellow 15, 2-amino-6-chloro-4-nitrophenol, picramic acid, 1,2-diamino-4-nitrobenzene, 1,4-diamino-2-nitrobenzene, 3-nitro-4-aminophenol, 1-hydroxy-2-amino-3-nitrobenzene, 2-hydroxyethylpicramic acid, 3-nitro-p-hydroxyethylaminophenol, 4-hydroxypropylamino-3-nitrophenol, N,N-bis(2-hydroxyethyl)-2'-nitro-p-phenylenediamine, and the like. Examples of anionic dyes include Acid Black 1, Acid Blue 1, Acid Blue 3, Food Blue No. 2, Food Blue No. 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, Red 106, Acid Red 155, Acid Red 180, Acid Purple 9, Acid Purple 43, Acid Purple 49, and Purple 4 Examples of suitable dyes include Acid Yellow 01, Acid Yellow 1, Acid Yellow 23, Acid Yellow 3, Food Yellow No. 8, Acid Orange 24, Acid Green 25, Solvent Green 7, Solvent Red 73, Acid Red 95, Solvent Red 43, Solvent Red 48, Acid Red 33, Solvent Purple 13, Acid Yellow 73, Yellow 203, Food Red No. 17, Food Red No. 1, Food Yellow No. 3, Food Blue No. 2, Food Black No. 1, Food Black No. 2, Dispersed Black 9, Dispersed Purple 1, and alkali metal salts thereof (sodium salts and potassium salts). Among these, from the viewpoint of dyeability, it is preferable to contain one or more selected from the group consisting of 2-amino-6-chloro-4-nitrophenol, 4-hydroxypropylamino-3-nitrophenol, Red 106, Purple 401, and Yellow 203.

[0019] Component (B) can be used alone or in combination of two or more. From the viewpoint of obtaining sufficient dyeability, the content of component (B) in the one-part hair dye composition is preferably 0.03% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.08% by mass or more, still more preferably 0.10% by mass or more, and still more preferably 0.15% by mass or more, and from the viewpoint of storage stability of the composition, it is preferably 30% by mass or less, more preferably 20% by mass or less, even more preferably 10% by mass or less, still more preferably 5.0% by mass or less, still more preferably 3.0% by mass or less, still more preferably 1.0% by mass or less, and still more preferably 0.5% by mass or less. The content of component (B) in the one-part hair dye composition is preferably 0.03 to 30% by mass, more preferably 0.05 to 20% by mass, even more preferably 0.08 to 10% by mass, still more preferably 0.10 to 5.0% by mass, even more preferably 0.15 to 3.0% by mass or less, even more preferably 0.15 to 1.0% by mass or less, and still more preferably 0.15 to 0.5% by mass.

[0020] <Component (C)> The one-part hair dye composition of the present invention contains an alkaline agent as component (C). Component (C) can be any alkaline agent used in conventional hair dyes, without any particular limitation. Examples of component (C) include ammonia; alkanolamines such as mono-, di-, or trimethanolamine, mono-, di-, or triethanolamine; alkylamines such as methylamine, dimethylamine, ethylamine, diethylamine, N-methylethylamine, propylamine, and butylamine; aralkylamines such as benzylamine; and inorganic alkali compounds such as sodium hydroxide and potassium hydroxide. One or more of these may be used. The number of carbon atoms in the alkanolamine, alkylamine, or aralkylamine is preferably 10 or less, more preferably 8 or less, from the viewpoint of water solubility. Among these, from the viewpoint of hair dyeability, the alkaline agent preferably contains one or more selected from the group consisting of ammonia, alkanolamine, alkylamine, aralkylamine, sodium hydroxide, and potassium hydroxide, more preferably contains one or more selected from the group consisting of ammonia and alkanolamine, even more preferably contains monoalkanolamine, and even more preferably contains monoethanolamine.

[0021] The content of component (C) in the one-part hair dye composition is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.5% by mass or more, and even more preferably 1% by mass or more, from the viewpoint of improving hair dyeing properties and imparting an excellent feel to hair, and is preferably 10% by mass or less, more preferably 7.5% by mass or less, even more preferably 5.0% by mass or less, and even more preferably 3% by mass or less, from the viewpoint of suppressing irritation. The content of component (C) in the one-part hair dye composition is preferably 0.01 to 10% by mass, more preferably 0.1 to 7.5% by mass, even more preferably 0.5 to 5.0% by mass, and even more preferably 1 to 3% by mass.

[0022] <Component (D)> The one-part hair dye composition of the present invention contains a nonionic surfactant as component (D). From the viewpoint of formulation stability, component (D) may include polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene fatty acid esters, higher fatty acid sucrose esters, polyglycerin fatty acid esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbit fatty acid esters, alkyl saccharides, alkylamine oxides, alkylamidoamine oxides, etc. Among these, it is preferable to contain one or more selected from the group consisting of polyoxyalkylene alkyl ethers, polyoxyethylene hydrogenated castor oil, and alkyl saccharides, and it is more preferable to contain polyoxyethylene alkyl ethers. As the polyoxyethylene alkyl ether, it is preferable to contain one represented by the following formula (2). R ４ -O-(A a O) r -H...(2) (In formula (2), R ４ represents a linear or branched, saturated or unsaturated hydrocarbon group having 8 to 22 carbon atoms; A a represents an ethylene group, and r represents an average value of 1 to 300.

[0023] R ４ From the viewpoint of formulation stability, the number of carbon atoms is preferably 10 to 22, more preferably 12 to 20, and even more preferably 12 to 18. r is the so-called average number of moles added, and is preferably 1 to 300, more preferably 2 to 200, even more preferably 2 to 100, and even more preferably 2 to 50.

[0024] Among these polyoxyethylene alkyl ethers, it is preferable to contain those represented by the following formula (2a) or (2b).

[0025] R ４ -O-(A ａ O)q-H...(2a) (In formula (2a), R ４From the viewpoint of formulation stability, A is preferably 10 to 22, more preferably 12 to 20, and even more preferably 12 to 18 straight-chain saturated hydrocarbon groups; ａ represents an ethylene group, and q is an average value of preferably 1 to 300, more preferably 2 to 200, even more preferably 2 to 100, and still more preferably 2 to 50.) Note that q in formula (2a) means the so-called average number of moles added.

[0026]

[0027] (In formula (2b), the sum of m and n is 9 to 11, and p is a number of 3 to 15.) In formula (2b), p means the so-called average number of moles added.

[0028] More specific examples of such polyoxyethylene alkyl ethers include polyoxyethylene lauryl ether, polyoxyethylene myristyl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene behenyl ether, etc., and from the viewpoint of formulation stability, it is preferable to contain one or more types selected from polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, and polyoxyethylene behenyl ether, and it is more preferable to contain polyoxyethylene cetyl ether.

[0029] The content of component (D) in the one-part hair dye composition is preferably 0.50% by mass or more, more preferably 0.70% by mass or more, even more preferably 0.90% by mass or more, still more preferably 1.1% by mass or more, and even more preferably 1.3% by mass or more, from the viewpoint of formulation stability and imparting an excellent feel to hair, and is preferably 10% by mass or less, more preferably 7.0% by mass or less, even more preferably 6.0% by mass or less, still more preferably 5.0% by mass or less, and even more preferably 4.5% by mass or less, from the viewpoint of suppressing a decrease in the feel of hair after treatment. The content of component (D) in the one-part hair dye composition is preferably 0.50 to 10% by mass, more preferably 0.70 to 7.0% by mass, even more preferably 0.90 to 6.0% by mass, still more preferably 1.1 to 5.0% by mass, and even more preferably 1.3 to 4.5% by mass.

[0030] In the one-component hair dye composition, the ratio of the mass content of component (D) to the mass content of component (B) [(D) / (B)] is 3.0 or more, preferably 3.5 or more, more preferably 3.7 or more, even more preferably 5.0 or more, still more preferably 6.0 or more, and is 30.0 or less, preferably 29.0 or less, more preferably 25.0 or less, even more preferably 23.0 or less, and still more preferably 21.0 or less, from the viewpoint of providing a one-component hair dye composition that can stably blend components (A) and (B), thereby realizing a wide variety of hair color expressions and providing hair with a good feel after treatment. In the one-part hair dye composition, the ratio of the mass of component (D) to the mass of component (B) [(D) / (B)] is 3.0 or more and 30.0 or less, preferably 3.5 to 29.0, more preferably 3.7 to 25.0, even more preferably 5.0 to 23.0, and still more preferably 6.0 to 21.0.

[0031] <Component (E)> The one-part hair dye composition of the present invention contains a cationic surfactant as component (E). Examples of component (E) include mono- or di-long-chain alkyl quaternary ammonium salts represented by the following formula (3): (In formula (3), R ５ is a linear or branched alkyl group having 8 to 22 carbon atoms; R ９CONH (CH ２ ) ｍ -, R ９ COO (CH ２ ) ｍ - (R ９ represents a linear or branched alkyl group having 7 to 21 carbon atoms, and m represents a number of 1 to 4. １０ -O-(CH ２ ) ｍ - (R １０ represents a linear or branched alkyl group having 8 to 22 carbon atoms, and m represents a number of 1 to 4. ６ is a linear or branched alkyl group having 1 to 22 carbon atoms, or ９ CONH (CH ２ ) ｍ -, R ９ COO (CH ２ ) ｍ - or R １０ -O-(CH ２ ) ｍ represents a group represented by -, and R ７ and R ８ each independently represents an alkyl group having 1 to 4 carbon atoms; Y － represents chloride ion, bromide ion, or methosulfate ion.

[0032] In the above formula (3), from the viewpoint of imparting an excellent feel to hair, preferably, R ５ is a linear or branched alkyl group having 8 to 22 carbon atoms, or R １０ -O-(CH ２ ) ｍ - (R １０ represents a linear or branched alkyl group having 8 to 22 carbon atoms, and m represents a number of 1 to 4. ６ is a linear or branched alkyl group having 1 to 22 carbon atoms, or １０ -O-(CH ２ ) ｍ -, and R ７ and R ８ are each independently an alkyl group having 1 to 4 carbon atoms, － is the chloride ion.

[0033] R ５ The number of carbon atoms in the linear or branched alkyl group in R is 8 or more and 22 or less, and from the viewpoint of imparting an excellent feel to hair, it is preferably 8 or more and 18 or less. ６ In the case of mono-long-chain alkyl quaternary ammonium salts, the number of carbon atoms in the linear or branched alkyl group having 1 to 22 carbon atoms is preferably 1 to 4, more preferably 1 to 3, from the viewpoints of availability and economy, and in the case of di-long-chain alkyl quaternary ammonium salts, the number of carbon atoms is preferably 8 to 22, more preferably 8 to 18. ７ and R ８ R are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and from the viewpoints of availability and economy, a methyl group is preferred. ９ The linear or branched alkyl group has 7 or more and 21 or less carbon atoms, and preferably 7 or more and 19 or less carbon atoms from the viewpoint of imparting an excellent feel to hair.

[0034] Specific examples of cationic surfactants that, from the viewpoint of imparting an excellent feel to hair, preferably contain one or more selected from the group consisting of monoalkyltrimethylammonium chloride, dialkyldimethylammonium chloride, monoalkyloxyalkyltrimethylammonium chloride, and monoalkyltrimethylammonium bromide, and among these, it is more preferable to contain one or more selected from the group consisting of behenyltrimethylammonium chloride, stearyltrimethylammonium chloride (steartrimonium chloride), cetyltrimethylammonium chloride (cetrimonium chloride), lauryltrimethylammonium chloride (lauryltrimonium chloride), dialkyl(C12-C18)dimethylammonium chloride, and octadecyloxypropyltrimethylammonium chloride, and it is even more preferable to contain stearyltrimethylammonium chloride (steartrimonium chloride).

[0035] The content of component (E) in the one-part hair dye composition is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.10% by mass or more, still more preferably 0.20% by mass or more, still more preferably 0.40% by mass or more, still more preferably 0.50% by mass or more, and still more preferably 0.70% by mass or more, from the viewpoint of imparting an excellent feel to hair, and is preferably 10% by mass or less, more preferably 5% by mass or less, even more preferably 2% by mass or less, and still more preferably 1% by mass or less, from the viewpoint of suppressing a decrease in the feel of hair after treatment. The content of component (E) in the one-part hair dye composition is preferably 0.01 to 10% by mass, more preferably 0.05 to 5% by mass, even more preferably 0.10 to 2% by mass, still more preferably 0.20 to 2% by mass, still more preferably 0.40 to 2% by mass, still more preferably 0.50 to 2% by mass, and still more preferably 0.70 to 1% by mass.

[0036] In the one-part hair dye composition, from the viewpoint of providing a one-part hair dye composition that can stably blend components (A) and (B), thereby realizing a wide variety of hair color expressions and providing hair with a pleasant feel after treatment, the ratio of the mass content of component (E) to the mass content of component (B) [(E) / (B)] is preferably 1 or more, more preferably 2 or more, even more preferably 3 or more, and is preferably 30 or less, more preferably 25 or less, more preferably 20 or less, more preferably 15 or less, even more preferably 9 or less, and still more preferably 5 or less. In the one-part hair dye composition, the ratio of the mass content of component (E) to the mass content of component (B) [(E) / (B)] is preferably 1 to 30, more preferably 1 to 25, more preferably 1 to 20, more preferably 1 to 15, even more preferably 2 to 9, and even more preferably 3 to 5.

[0037] In the one-part hair dye composition, from the viewpoint of providing a one-part hair dye composition that can stably blend components (A) and (B), thereby realizing a wide variety of hair color expressions and providing hair with a pleasant feel after treatment, the ratio of the mass of component (E) contained to the total mass of components (A) and (B) [(E) / {(A)+(B)}] is preferably 0.1 or more, more preferably 0.5 or more, even more preferably 1 or more, still more preferably 1.5 or more, and is preferably 10 or less, more preferably 7 or less, even more preferably 4 or less, and still more preferably 2 or less. In the one-part hair dye composition, the ratio of the mass of component (E) contained to the total mass of components (A) and (B) [(E) / {(A)+(B)}] is preferably 0.1 to 10, more preferably 0.5 to 7, even more preferably 1 to 4, and even more preferably 1.5 to 2.

[0038] (Antioxidant) From the viewpoint of inhibiting polymerization of component (A) outside the hair, it is preferable that the one-part hair dye composition further contains an antioxidant. Examples of antioxidants include sulfurous acid, ascorbic acid, thioglycolic acid, L-cysteine, N-acetyl-L-cysteine, and salts thereof. From the viewpoint of stabilizing component (A) and improving hair dyeing properties, it is preferable that the one-part hair dye composition contains one or more selected from the group consisting of sulfurous acid and its salts, and ascorbic acid and its salts, more preferably one or more selected from the group consisting of sodium sulfite and ascorbic acid, and even more preferably both sodium sulfite and ascorbic acid. When the one-part hair dye composition contains an antioxidant, the content thereof in the one-part hair dye composition is, from the viewpoint of suppressing polymerization of component (A) outside the hair, preferably 0.010% by mass or more, more preferably 0.050% by mass or more, even more preferably 0.10% by mass or more, still more preferably 0.20% by mass or more, still more preferably 0.30% by mass or more, still more preferably 0.50% by mass or more, and is preferably 3.0% by mass or less, more preferably 2.0% by mass or less, still more preferably 1.5% by mass or less, still more preferably 1.2% by mass or less, and still more preferably 1.1% by mass or less.

[0039] <Component (F)> The one-part hair dye composition of the present invention preferably further contains a higher alcohol as component (F). When the one-part hair dye composition is a hair cosmetic selected from the group consisting of a rinse, a conditioning agent, and a treatment agent, the effect of improving emulsion stability is achieved, and when the one-part hair dye composition is a hair cleanser, the effect of improving foaming is achieved. The higher alcohol is preferably a compound represented by the general formula R １１ -OH (wherein, R １１ represents a linear or branched hydrocarbon group having 12 to 24 carbon atoms. １１ From the viewpoint of improving emulsion stability and foaming, is preferably a linear or branched aliphatic hydrocarbon group having from 12 to 24 carbon atoms, more preferably a linear or branched alkyl group having from 12 to 24 carbon atoms or a linear or branched alkenyl group having from 12 to 24 carbon atoms, even more preferably a linear alkyl group having from 12 to 24 carbon atoms or a linear alkenyl group having from 12 to 24 carbon atoms. Examples of higher alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, isostearyl alcohol, arachyl alcohol, behenyl alcohol, carnaubyl alcohol, and oleyl alcohol. One or more higher alcohols can be used in combination. Among these, from the viewpoint of improving emulsion stability and foaming, it is preferable to contain one or more selected from the group consisting of stearyl alcohol and behenyl alcohol, more preferably stearyl alcohol and behenyl alcohol, and even more preferably stearyl alcohol and behenyl alcohol.

[0040] When the one-part hair dye composition contains component (F), from the viewpoints of improving emulsion stability and imparting an excellent feel to hair, the content thereof is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, even more preferably 2.0% by mass or more, still more preferably 4.0% by mass or more, even more preferably 5.0% by mass or more, and is preferably 15% by mass or less, more preferably 12% by mass or less, even more preferably 10% by mass or less, still more preferably 8% by mass or less, and even more preferably 7% by mass or less. When the one-part hair dye composition contains component (F), the content thereof is preferably 0.5 to 15% by mass, more preferably 1.0 to 12% by mass, even more preferably 2.0 to 10% by mass or less, still more preferably 4.0 to 8% by mass, and even more preferably 4.0 to 7% by mass.

[0041] In the one-part hair dye composition, the ratio of the mass content of component (F) to the total mass content of components (D) and (E) [(F) / {(D)+(E)}] is preferably more than 0.6, more preferably 0.7 or more, even more preferably 0.8 or more, still more preferably 1.0 or more, still more preferably 1.2 or more, and still more preferably 1.3 or more, from the viewpoint of suppressing a decrease in the feel of the hair after treatment; and is preferably less than 3.9, more preferably 3.7 or less, even more preferably 3.5 or less, still more preferably 3.2 or less, still more preferably 3.0 or less, still more preferably 2.5 or less, and still more preferably 2.1 or less, from the viewpoint of imparting an excellent feel to the hair. In the one-part hair dye composition, the ratio of the mass content of component (F) to the total mass content of components (D) and (E) [(F) / {(D)+(E)}] is preferably more than 0.6 and less than 3.9, more preferably 0.7 to 3.7, even more preferably 0.8 to 3.5, still more preferably 1.0 to 3.2, still more preferably 1.2 to 3.0, still more preferably 1.3 to 2.5, and still more preferably 1.3 to 2.1.

[0042] <Other Components> In addition to the above-mentioned components, the one-part hair dye composition of the present invention may contain, as appropriate, components commonly used in one-part hair dye compositions, provided that the purpose of the present invention is not impaired. Examples of such components include surfactants other than nonionic surfactants and cationic surfactants, oils, pH adjusters, dyeing agents other than components (A) and (B), aqueous media, polymers, aromatic alcohols, antidandruff agents, vitamins, disinfectants, anti-inflammatory agents, preservatives, chelating agents, moisturizers, pearlescent agents, ceramides, fragrances, and ultraviolet absorbers.

[0043] <Surfactants other than nonionic surfactants and cationic surfactants> The one-part hair dye composition of the present invention may further contain a surfactant other than nonionic surfactants and cationic surfactants. Examples of the surfactant include amphoteric surfactants and anionic surfactants.

[0044] (Anionic Surfactants) Examples of anionic surfactants include alkylbenzenesulfonates, alkyl or alkenyl ether sulfates, alkyl or alkenyl sulfates, olefin sulfonates, alkanesulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, α-sulfofatty acid salts, N-acylamino acids, mono- or diester phosphates, sulfosuccinates, etc., and one or more of these can be used. Examples of counter ions of the anionic group of the anionic surfactant include alkali metal ions such as sodium ions and potassium ions; alkaline earth metal ions such as calcium ions and magnesium ions; ammonium ions; and alkanolamines having 1 to 3 alkanol groups having 2 or 3 carbon atoms (e.g., monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, etc.). When the one-component hair dye composition contains an anionic surfactant, the content thereof in the one-component hair dye composition is preferably 3% by mass or more, more preferably 5% by mass or more, and even more preferably 8% by mass or more, from the viewpoints of good foaming and ease of washing when the one-component hair dye composition is used as a hair wash. Furthermore, from the viewpoints of improving hair dyeing properties and suppressing hair damage, the content thereof is preferably 40% by mass or less, more preferably 30% by mass or less, even more preferably 20% by mass or less, and even more preferably 15% by mass or less. When the one-component hair dye composition contains an anionic surfactant, the content thereof is preferably 3 to 40% by mass, more preferably 5 to 30% by mass, even more preferably 8 to 20% by mass, and even more preferably 8 to 15% by mass.

[0045] (Amphoteric Surfactants) Examples of amphoteric surfactants include betaine surfactants such as alkyldimethylaminoacetic acid betaine, fatty acid amidopropyl betaine, and alkylhydroxysulfobetaine; and sultaine surfactants such as laurylhydroxysultaine. When the one-component hair dye composition contains an amphoteric surfactant, the content thereof in the one-component hair dye composition is, from the viewpoints of ease of application to hair and good foaming, preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.15% by mass or more, and preferably 15% by mass or less, more preferably 12% by mass or less, and even more preferably 10% by mass or less. When the one-component hair dye composition contains an amphoteric surfactant, the content thereof is preferably 0.05 to 15% by mass, more preferably 0.1 to 12% by mass, and even more preferably 0.15 to 10% by mass.

[0046] (Oil) The one-part hair dye composition of the present invention may contain an oil to improve the feel of hair. Examples of oils include hydrocarbons such as squalene, squalane, liquid paraffin, liquid isoparaffin, and cycloparaffin; glycerides such as castor oil, cocoa oil, mink oil, avocado oil, and olive oil; waxes such as beeswax, spermaceti, lanolin, and carnauba wax; esters such as isopropyl palmitate, isopropyl myristate, octyldodecyl myristate, hexyl laurate, cetyl lactate, propylene glycol monostearate, oleyl oleate, hexadecyl 2-ethylhexanoate, isononyl isononanoate, and tridecyl isononanoate; higher fatty acids such as capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, coconut oil fatty acid, isostearyl acid, and isopalmitic acid; and others such as isostearyl glyceryl ether and polyoxypropylene butyl ether. These oils can be used alone or in combination of two or more.

[0047] When the one-part hair dye composition contains an oil, the content thereof in the one-part hair dye composition is preferably 0.2% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more from the viewpoint of improving the feel of hair, and is preferably 10% by mass or less, more preferably 8% by mass or less, and even more preferably 5% by mass or less from the viewpoint of suppressing a decrease in the feel of hair. When the one-part hair dye composition contains an oil, the content thereof is preferably 0.2 to 10% by mass, more preferably 0.3 to 8% by mass, and even more preferably 0.5 to 5% by mass.

[0048] (pH Adjuster) The one-part hair dye composition of the present invention may contain a pH adjuster from the viewpoint of adjusting the pH to the optimum range for polymerization of component (A) and improving hair dyeing properties. A protonating agent is preferred as the pH adjuster. The protonating agent may be either a monobasic acid or a polybasic acid, and may be either an organic acid (having from 1 to 8 carbon atoms, excluding ascorbic acid) or an inorganic acid. Examples of the protonating agent include one or more selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid, formic acid, acetic acid, and citric acid, and one or two selected from the group consisting of phosphoric acid and citric acid are more preferred.

[0049] When a pH adjuster is used, its content is not particularly limited as long as it can adjust the pH of the one-part hair dye composition to 8.0 or more and 11.0 or less, but is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.2% by mass or more. From the viewpoint of formulation stability, the content is preferably 5.0% by mass or less, more preferably 4.0% by mass or less, and even more preferably 3.5% by mass or less.

[0050] (Dyeing Agents Other Than Components (A) and (B)) The one-part hair dye composition of the present invention may further contain a dyeing agent other than components (A) and (B). Examples of such dyeing agents include oxidation dyes (composed of a precursor and a coupler) that are commonly used in hair dyes. One or more of the above dyeing agents other than components (A) and (B) can be used. When such a dyeing agent is used, it is preferable that the composition contains an oxidation dye. Preferable precursors include paraphenylenediamine, toluene-2,5-diamine, paraaminophenol, 4-aminometacresol, 1-hydroxyethyl-4,5-diaminopyrazole, and salts thereof, and preferable couplers include 2,4-diaminophenoxyethanol, meta-aminophenol, 2-methyl-5-aminophenol [=5-aminoorthocresol], resorcinol, 2-methylresorcinol, 4-chlororesorcinol, 1-naphthol, 2-amino-3-hydroxypyridine, 2-amino-4-(β-hydroxyethyl)aminoanisole, and salts thereof.

[0051] When a dyeing agent other than components (A) and (B) is used, its content in the one-part hair dye composition is preferably 0.01% by mass or more, more preferably 0.02% by mass or more, even more preferably 0.05% by mass or more, and preferably 1% by mass or less, more preferably 0.5% by mass or less.

[0052] (Aqueous Medium) A one-component hair dye composition typically contains an aqueous medium. Examples of aqueous media include water; lower alcohols such as ethanol and isopropyl alcohol; and low-molecular-weight diols and triols having 6 or less carbon atoms, such as 1,3-butylene glycol, glycerin, ethylene glycol, and propylene glycol, with water being preferred. The content of the aqueous medium in a one-component hair dye composition can be appropriately selected depending on the formulation of the one-component hair dye composition, but is typically in the range of 1 to 95% by mass. When water is used as the aqueous medium, from the viewpoint of increasing the adhesion of the composition to hair due to the viscosity of the composition and allowing components (A) and (B) to penetrate into the hair and exhibit high hair dyeing properties, the content of water in the one-component hair dye composition is preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, and preferably 95% by mass or less, more preferably 90% by mass or less. The content of water in the one-part hair dye composition is preferably 50 to 95% by mass, more preferably 60 to 95% by mass, and even more preferably 70 to 90% by mass.

[0053] <pH> From the viewpoint of improving hair dyeability, the pH of the one-part hair dye composition of the present invention is 8.0 or higher, preferably 8.5 or higher, and more preferably 9.0 or higher. This is because component (A), which is a melanin precursor, reacts with oxygen in the air under basic conditions and is easily converted into a melanin pigment. From the viewpoint of improving hair dyeability and suppressing damage to hair, the pH is 11.0 or lower, more preferably 10.5 or lower. The above pH is measured at 25°C, and specifically, can be measured by the method described in the Examples.

[0054] There are no particular restrictions on the method for producing the one-part hair dye composition of the present invention. For example, the composition can be produced by blending components (A) to (D) and other components used as needed using the method described in the Examples, and mixing them using a known stirring device or the like.

[0055] The one-part hair dye composition of the present invention may be filled in an oxygen-blocking container. The container may be for aerosol use or may not be for aerosol use.

[0056] The one-part hair dye composition of the present invention can be applied to hair to dye the hair. For example, a method of dyeing hair can be used in which the one-part hair dye composition is applied to the hair and washed as needed, and the steps are repeated on a daily basis. By such daily hair care routines, gray hair and other hair can be easily dyed.

[0057] In relation to the above-mentioned embodiments, the present invention further discloses the following: [1] The following components (A) to (E): (A) a compound represented by the following formula (1) or a salt thereof: (In formula (1), the dashed line indicates the presence or absence of a π bond. R １ represents a hydroxyl group or an acetoxy group. ２ represents a hydrogen atom or -COOR (wherein R is a hydrogen atom, a methyl group, or an ethyl group). ３represents a hydrogen atom, an acetyl group, a methyl group, or an ethyl group.) A one-component hair dye composition comprising: (B) a neutral or anionic direct dye; (C) an alkaline agent; (D) a nonionic surfactant; and (E) a cationic surfactant, wherein the ratio (D) / (B) of the mass content of component (D) to the mass content of component (B) is 3.0 or more and 30.0 or less, and the pH is 8.0 or more and 11.0 or less. [2] The one-part hair dye composition according to [1] above, which preferably contains, as component (A), one or more selected from the group consisting of 5,6-dihydroxyindole, 5,6-dihydroxyindole-2-carboxylic acid, 5,6-dihydroxyindoline, 5,6-dihydroxyindoline-2-carboxylic acid, and salts thereof, more preferably one or more selected from the group consisting of 5,6-dihydroxyindole, 5,6-dihydroxyindole-2-carboxylic acid, and 5,6-dihydroxyindoline hydrobromide, and even more preferably one or more selected from the group consisting of 5,6-dihydroxyindole and 5,6-dihydroxyindole-2-carboxylic acid. [3] The one-part hair dye composition of [1] or [2] above, wherein the content of component (A) in the one-part hair dye composition is preferably 0.05 to 0.50% by mass, more preferably 0.07 to 0.45% by mass, even more preferably 0.10 to 0.40% by mass, and even more preferably 0.20 to 0.35% by mass. [4] The one-part hair dye composition of any one of [1] to [3] above, wherein component (B) preferably contains one or more members selected from the group consisting of 2-amino-6-chloro-4-nitrophenol, 4-hydroxypropylamino-3-nitrophenol, Red 106, Purple 401, and Yellow 203. [5] The one-component hair dye composition according to any one of [1] to [4] above, wherein the content of component (B) in the one-component hair dye composition is preferably 0.03 to 30% by mass, more preferably 0.05 to 20% by mass, even more preferably 0.08 to 10% by mass, still more preferably 0.10 to 5.0% by mass, even more preferably 0.15 to 3.0% by mass or less, even more preferably 0.15 to 1.0% by mass or less, and still more preferably 0.15 to 0.5% by mass.

[0058] [6] The one-part hair dye composition of any one of [1] to [5] above, wherein component (C) preferably contains one or more selected from the group consisting of ammonia, alkanolamines, alkylamines, aralkylamines, sodium hydroxide, and potassium hydroxide, more preferably contains one or more selected from the group consisting of ammonia and alkanolamines, even more preferably contains a monoalkanolamine, and still more preferably contains monoethanolamine. [7] The one-part hair dye composition of any one of [1] to [6] above, wherein the content of component (C) in the one-part hair dye composition is preferably 0.01 to 10% by mass, more preferably 0.1 to 7.5% by mass, even more preferably 0.5 to 5.0% by mass, and still more preferably 1 to 3% by mass. [8] The one-part hair dye composition of any one of [1] to [7] above, wherein component (D) preferably contains one or more selected from the group consisting of polyoxyalkylene alkyl ethers, polyoxyethylene hydrogenated castor oil, and alkyl saccharides, more preferably polyoxyethylene alkyl ethers. [9] The one-part hair dye composition of any one of [1] to [8] above, wherein the content of component (D) in the one-part hair dye composition is preferably 0.50 to 10% by mass, more preferably 0.70 to 7.0% by mass, even more preferably 0.90 to 6.0% by mass, still more preferably 1.1 to 5.0% by mass, and even more preferably 1.3 to 4.5% by mass.

[10] The one-part hair dye composition according to any one of the above [1] to [9], wherein the ratio of the mass of component (D) to the mass of component (B) [(D) / (B)] is preferably 3.5 to 29.0, more preferably 3.7 to 25.0, even more preferably 5.0 to 23.0, and still more preferably 6.0 to 21.0.

[0059]

[11] The one-part hair dye composition according to any one of [1] to

[10] above, wherein component (E) is a mono- or di-long-chain alkyl quaternary ammonium salt represented by the following formula (3): (In formula (3), R ５ is a linear or branched alkyl group having 8 to 22 carbon atoms; R ９ CONH (CH ２ ) ｍ -, R ９ COO (CH２ ) ｍ - (R ９ represents a linear or branched alkyl group having 7 to 21 carbon atoms, and m represents a number of 1 to 4. １０ -O-(CH ２ ) ｍ - (R １０ represents a linear or branched alkyl group having 8 to 22 carbon atoms, and m represents a number of 1 to 4. ６ is a linear or branched alkyl group having 1 to 22 carbon atoms, or ９ CONH (CH ２ ) ｍ -, R ９ COO (CH ２ ) ｍ - or R １０ -O-(CH ２ ) ｍ represents a group represented by -, and R ７ and R ８ each independently represents an alkyl group having 1 to 4 carbon atoms; Y －represents a chloride ion, a bromide ion, or a methosulfate ion.)

[12] The one-part hair dye composition according to any one of the above [1] to

[10] , wherein component (E) preferably contains one or more selected from the group consisting of monoalkyltrimethylammonium chloride, dialkyldimethylammonium chloride, monoalkyloxyalkyltrimethylammonium chloride, and monoalkyltrimethylammonium bromide, more preferably one or more selected from the group consisting of behenyltrimethylammonium chloride, stearyltrimethylammonium chloride (steartrimonium chloride), cetyltrimethylammonium chloride (cetrimonium chloride), lauryltrimethylammonium chloride (lauryltrimonium chloride), dialkyl(C12-C18)dimethylammonium chloride, and octadecyloxypropyltrimethylammonium chloride, more preferably stearyltrimethylammonium chloride (steartrimonium chloride).

[13] The one-part hair dye composition according to any one of the above [1] to

[12] , wherein the content of component (E) in the one-part hair dye composition is preferably 0.01 to 10% by mass, more preferably 0.05 to 5% by mass, even more preferably 0.10 to 3% by mass, still more preferably 0.20 to 2% by mass, even more preferably 0.40 to 2% by mass, still more preferably 0.50 to 2% by mass, and still more preferably 0.70 to 1% by mass.

[0060]

[14] The one-part hair dye composition of any one of the above [1] to

[13] , wherein the ratio of the mass content of component (E) to the mass content of component (B) [(E) / (B)] is preferably 1 to 30, more preferably 1 to 25, more preferably 1 to 20, more preferably 1 to 15, even more preferably 2 to 9, and still more preferably 3 to 5.

[15] The one-part hair dye composition of any one of the above [1] to

[14] , wherein the ratio of the mass content of component (E) to the total mass content of components (A) and (B) [(E) / {(A)+(B)}}] is preferably 0.1 to 10, more preferably 0.5 to 7, even more preferably 1 to 4, and still more preferably 1.5 to 2.

[16] The one-part hair dye composition of any one of [1] to

[15] above, further comprising a higher alcohol as component (F), wherein component (F) preferably comprises one or more selected from the group consisting of stearyl alcohol and behenyl alcohol, more preferably stearyl alcohol and behenyl alcohol, and even more preferably stearyl alcohol and behenyl alcohol.

[17] The one-part hair dye composition of

[16] above, wherein the content of component (F) in the one-part hair dye composition is preferably 0.5 to 15% by mass, more preferably 1.0 to 12% by mass, even more preferably 2.0 to 10% by mass or less, still more preferably 4.0 to 8% by mass, and even more preferably 4.0 to 7% by mass.

[18] The one-part hair dye composition according to the above

[16] or

[17] , wherein the ratio of the mass content of component (F) to the total mass content of components (D) and (E) [(F) / {(D)+(E)}] is preferably more than 0.6 and less than 3.9, more preferably 0.7 to 3.7, even more preferably 0.8 to 3.5, still more preferably 1.0 to 3.2, still more preferably 1.2 to 3.0, still more preferably 1.3 to 2.5, and still more preferably 1.3 to 2.1.

[0061]

[19] The one-component hair dye composition of any one of [1] to

[18] above, wherein the content of the anionic surfactant in the one-component hair dye composition is preferably 3 to 40% by mass, more preferably 5 to 30% by mass, even more preferably 8 to 20% by mass, and even more preferably 8 to 15% by mass.

[20] The one-component hair dye composition of any one of [1] to

[19] above, wherein the content of the amphoteric surfactant in the one-component hair dye composition is preferably 0.05 to 15% by mass, more preferably 0.1 to 12% by mass, and even more preferably 0.15 to 10% by mass.

[21] The one-component hair dye composition of any one of [1] to

[20] above, wherein the content of the oily agent in the one-component hair dye composition is preferably 0.2 to 10% by mass, more preferably 0.3 to 8% by mass, and even more preferably 0.5 to 5% by mass.

[22] The one-component hair dye composition according to any one of the above [1] to

[21] , wherein the content of water in the one-component hair dye composition is preferably 50 to 95% by mass, more preferably 60 to 95% by mass, and even more preferably 70 to 90% by mass.

[0062]

[23] The one-part hair dye composition of any one of the above [1] to

[22] , wherein component (B) contains 2-amino-6-chloro-4-nitrophenol.

[24] The one-part hair dye composition of any one of the above [1] to

[22] , wherein component (B) contains 2-amino-6-chloro-4-nitrophenol, Red 106, and Purple 401.

[25] The one-part hair dye composition of any one of the above [1] to

[24] , wherein component (D) contains a polyoxyethylene alkyl ether.

[26] The one-part hair dye composition of any one of the above [1] to

[25] , wherein component (D) contains a polyoxyethylene alkyl ether represented by the following formula (2a): R ４ -O-(A ａ O)q-H...(2a) (In formula (2a), R ４ represents a linear saturated hydrocarbon group of 12 to 22 carbon atoms; A ａ represents an ethylene group, and q is an average value of 2 to 50.

[27] The one-part hair dye composition according to any one of the above [1] to

[26] , wherein component (E) is a mono-long-chain alkyl quaternary ammonium salt represented by the following formula (3): (In formula (3), R ５ represents a linear alkyl group having 8 to 22 carbon atoms, and R６ represents a linear alkyl group having 1 to 3 carbon atoms, and R ７ and R ８ represents a methyl group, and Y － represents a chloride ion.)

[28] The one-part hair dye composition of any one of the above [1] to

[27] , wherein component (E) contains one or more selected from the group consisting of stearyltrimethylammonium chloride (steartrimonium chloride), behenyltrimethylammonium chloride, and cetyltrimethylammonium chloride (cetrimonium chloride).

[29] The one-part hair dye composition of any one of the above [1] to

[28] , further containing a higher alcohol as component (F), wherein component (F) contains one or more selected from the group consisting of stearyl alcohol, behenyl alcohol, cetyl alcohol, and oleyl alcohol.

[0063]

[30] The one-component hair dye composition of any one of [1] to

[29] above, wherein the content of component (A) in the one-component hair dye composition is 0.2% by mass or more.

[31] The one-component hair dye composition of any one of [1] to

[30] above, wherein the content of component (A) in the one-component hair dye composition is 0.5% by mass or less.

[32] The one-component hair dye composition of any one of [1] to

[31] above, wherein the content of component (B) in the one-component hair dye composition is 0.1% by mass or more.

[33] The one-component hair dye composition of any one of [1] to

[32] above, wherein the content of component (B) in the one-component hair dye composition is 0.5% by mass or less.

[34] The one-component hair dye composition of any one of [1] to

[33] above, wherein the content of component (C) in the one-component hair dye composition is 1% by mass or more.

[35] The one-component hair dye composition of any one of [1] to

[34] above, wherein the content of component (C) in the one-component hair dye composition is 3% by mass or less.

[36] The one-component hair dye composition of any one of [1] to

[35] above, wherein the content of component (D) in the one-component hair dye composition is 1.1% by mass or more.

[37] The one-component hair dye composition of any one of [1] to

[36] above, wherein the content of component (D) in the one-component hair dye composition is 5.0% by mass or less.

[38] The one-component hair dye composition of any one of [1] to

[37] above, wherein the content of component (E) in the one-component hair dye composition is 0.50% by mass or more.

[39] The one-component hair dye composition of any one of [1] to

[38] above, wherein the content of component (E) in the one-component hair dye composition is 2% by mass or less.

[40] The one-component hair dye composition according to any one of

[29] to

[39] above, wherein the content of component (F) in the one-component hair dye composition is 4.0% by mass or more.

[41] The one-component hair dye composition according to any one of

[29] to

[40] above, wherein the content of component (F) in the one-component hair dye composition is 7% by mass or less.

[0064]

[42] The one-component hair dye composition of any one of the above [1] to

[41] , wherein the ratio of the mass of component (D) to the mass of component (B) [(D) / (B)] is 3.0 or more.

[43] The one-component hair dye composition of any one of the above [1] to

[42] , wherein the ratio of the mass of component (D) to the mass of component (B) [(D) / (B)] is 30.0 or less.

[44] The one-component hair dye composition of any one of the above [1] to

[43] , wherein the ratio of the mass of component (F) to the total mass of components (D) and (E) [(F) / {(D)+(E)}] is 0.7 or more.

[45] The one-component hair dye composition of any one of the above [1] to

[44] , wherein the ratio of the mass content of component (F) to the total mass content of components (D) and (E) [(F) / {(D)+(E)}] is 3.7 or less.

[46] The one-component hair dye composition of any one of the above [1] to

[45] , wherein the ratio of the mass content of component (E) to the mass content of component (B) [(E) / (B)] is 1 or more.

[47] The one-component hair dye composition of any one of the above [1] to

[45] , wherein the ratio of the mass content of component (E) to the mass content of component (B) [(E) / (B)] is 2 or more.

[48] The one-component hair dye composition of any one of the above [1] to

[45] , wherein the ratio of the mass content of component (E) to the mass content of component (B) [(E) / (B)] is 3 or more.

[49] The one-component hair dye composition of any one of the above [1] to

[45] , wherein the ratio of the mass content of component (E) to the mass content of component (B) [(E) / (B)] is 25 or less.

[50] The one-component hair dye composition of any one of the above [1] to

[45] , wherein the ratio of the mass content of component (E) to the mass content of component (B) [(E) / (B)] is 20 or less.

[51] The one-component hair dye composition of any one of the above [1] to

[45] , wherein the ratio of the mass content of component (E) to the mass content of component (B) [(E) / (B)] is 15 or less.

[52] The one-component hair dye composition of any one of the above [1] to

[45] , wherein the ratio of the mass content of component (E) to the mass content of component (B) [(E) / (B)] is 9 or less.

[53] The one-part hair dye composition according to any one of the above [1] to

[45] , wherein the ratio of the mass of component (E) to the mass of component (B) [(E) / (B)] is 5 or less.

[54] The one-part hair dye composition of any one of the above [1] to

[53] , wherein the ratio of the mass of component (E) to the total mass of components (A) and (B) [(E) / {(A)+(B)}] is 0.5 or more.

[55] The one-part hair dye composition of any one of the above [1] to

[54] , wherein the ratio of the mass of component (E) to the total mass of components (A) and (B) [(E) / {(A)+(B)}] is 7 or less.

[56] A method for dyeing hair, comprising repeating the steps of applying the one-part hair dye composition of any one of the above [1] to

[55] to hair and washing.

[0065] The present invention will be described below with reference to examples, but the present invention is not limited to the scope of the examples.

[0066] <pH Measurement> The pH of each one-part hair dye composition at 25°C was measured using a pH meter (F-51, manufactured by Horiba, Ltd.).

[0067] [Preparation of One-Part Hair Dye Composition (Conditioner)] Example 1 0.2 parts by mass of 2-amino-6-chloro-4-nitrophenol as component (B), 3.0 parts by mass of monoethanolamine as component (C), 3.15 parts by mass of a 28% aqueous solution of stearyl trimethylammonium chloride (Cortamin 86W: manufactured by Kao Corporation) as component (E) (0.88 parts by mass as stearyl trimethylammonium chloride), purified water, and phosphoric acid were mixed in predetermined amounts to obtain a one-part hair dye composition with a pH of 10.2 and a concentration of 100 parts by mass. To this aqueous solution were added 0.24 parts by mass of polyoxyethylene (2) cetyl ether and 0.53 parts by mass of polyoxyethylene (40) cetyl ether as components (D), and 2.2 parts by mass of stearyl alcohol and 2.8 parts by mass of behenyl alcohol as components (F), to prepare an emulsifier. Furthermore, under a nitrogen atmosphere, 0.6 parts by mass of ascorbic acid, 0.35 parts by mass of sodium sulfite, and 25.0 parts by mass of an aqueous solution containing component (A) (0.25 parts by mass of component (A)) were added to obtain a one-part hair dye composition.

[0068] Examples 2 to 13, Comparative Examples 1 and 2 One-part hair dye compositions of Examples 2 to 13 and Comparative Examples 1 and 2 were obtained in the same manner as in Example 1, except that the contents of each component were changed as shown in Table 1. The pH at 25°C was 10.2 in all cases. The one-part hair dye compositions of Examples 1 to 13 and Comparative Examples 1 and 2 were evaluated as follows. The results are shown in Tables 1 and 2.

[0069] <Evaluation (Stability) of One-Part Hair Dye Composition> After 0.1 g of the one-part hair dye composition was dispensed and spread on a glass slide, a cover glass was placed on top, and the presence or absence of precipitates in the one-part hair dye composition was visually observed to evaluate stability. The evaluation criteria were as follows: A: No precipitates were observed; B: Precipitates were observed but were fine and uniformly dispersed throughout; C: Precipitates were observed and were present locally in agglomerations.

[0070] <Evaluation of One-Part Hair Dye Composition (Tactile Evaluation)> 10 g of the one-part hair dye composition obtained in each example was evenly applied to a 30 cm long, 10 g mass of black human hair tress ("BS-A" manufactured by Bealux Co., Ltd., root-aligned) at a bath ratio of 1:1 (tress:one-part hair dye composition), and left for 10 minutes in an atmosphere at 30° C. The treated tress was then rinsed with warm water for 30 seconds to wash away the one-part hair dye composition, towel-dried, and the water content adjusted to a bath ratio of 1:0.4 (tress:water).

[0071] After this series of treatments was completed, the feel was evaluated according to the following criteria. Evaluation was carried out by five expert panelists using the following criteria to evaluate the feel on a five-point scale, and the average score of the five panelists was calculated. 5 points: judged to have good slipperiness 4 points: judged to have somewhat good slipperiness 3 points: judged to have neither good nor bad slipperiness 2 points: judged to have somewhat poor slipperiness 1 point: judged to have poor slipperiness

[0072] <Evaluation of One-Part Hair Dye Compositions (ΔC Value, L Value)> 1 g of the one-part hair dye composition obtained in each Example was evenly applied to a 10 cm long, 1 g mass gray hair tress ("BM-W-A" manufactured by Beaulux Co., Ltd.) at a bath ratio of 1:1 (tress:one-part hair dye composition), and left to stand for 10 minutes in an atmosphere at 30°C. The treated tress was then rinsed with warm water for 30 seconds, washed for 15 seconds with a plain shampoo of the composition shown below, and rinsed with warm water for another 15 seconds. After 15 minutes in an atmosphere at 30°C, the tress was dried by exposing it to cold air from a hair dryer for 15 minutes.

[0073] The saturation (C value) and lightness (L value) of the resulting dried traces were measured at six points per trace using a color difference meter (CR-400 manufactured by Konica Minolta, Inc.), and the average values ​​were calculated. The saturation (C value) was calculated using the following formula (x), and the obtained C value was introduced into the following formula (y) to calculate the ΔC value. C value = {(a ＊ ) ２ +(b ＊ ) ２} １ / ２ ΔC value = (C value of tresses dyed with the compositions of each Example and Comparative Example) - (C value of tresses dyed with a composition containing only DHI as a dye) (y)

[0074] (Plain shampoo) (mass %) Sodium polyoxyethylene lauryl ether sulfate (Emar E-27C (active ingredient amount: 27 mass %), manufactured by Kao Corporation) 57.4 Lauramide DEA (Aminone L-02, manufactured by Kao Corporation) 1.5 EDTA-2Na (Frost DS, manufactured by Daiichi Pure Chemicals Co., Ltd.) 0.3 Phosphoric acid (adjusted to pH 7.0) Appropriate amount Purified water Remaining total 100 In assessing whether diverse color expression was possible, a ΔC value of 3.6 or more was rated as pass (P), an L value of 36 or more was rated as pass (P), and any other value was rated as fail (F). When both the ΔC value and L value were rated as pass (P), it was evaluated that diverse color expression was achieved.

[0075] <Evaluation (Color) of One-Part Hair Dye Composition> 1 g of the one-part hair dye composition obtained in each Example was evenly applied to a 10 cm long, 1 g mass gray hair tress ("BM-W-A" manufactured by Beaulux Co., Ltd.) at a bath ratio of 1:1 (tress:one-part hair dye composition), and left to stand for 10 minutes in a 30°C atmosphere. The treated tress was then rinsed with warm water for 30 seconds, washed for 15 seconds with the plain shampoo used in the above "Evaluation of One-Part Hair Dye Composition (ΔC Value, L Value)", and rinsed with warm water for a further 15 seconds. After 15 minutes in a 30°C atmosphere, the tress was dried by exposing it to cold air from a hair dryer for 15 minutes. The color of the dried tress was evaluated by visual observation in accordance with JIS Z 8102.

[0076]

[0077]

[0078] The components (*1 to *16) listed in Tables 1 and 2 are shown below. *1: Solution produced by the method described in Japanese Patent No. 5570161 (5,6-dihydroxyindole: 1% by mass, 5,6-dihydroxyindole-2-carboxylic acid: 0.14% by mass, ethanol: 20% by mass, water: balance) *2: 5,6-dihydroxyindoline hydrobromide (manufactured by SHANGHAI ICHEMICAL TECHNOLOGY CO., LTD.) *3: RODOL 9R BASE (manufactured by Zhejiang Dragon Chemical Co., Ltd.) *4: HC RED BN (manufactured by Zhejiang Dragon Chemical Co., Ltd.) *5: Red No. 106 (manufactured by Kishi Chemical Co., Ltd.) *6: Purple No. 401 (manufactured by Kishi Chemical Co., Ltd.) *7: Yellow No. 203 (manufactured by Kishi Chemicals Co., Ltd.) *8: Monoethanolamine (manufactured by Petronas Chemicals) *9: Nikkol BC-2 (manufactured by Nikko Chemicals Co., Ltd.) *10: Nikkol BC-40 (manufactured by Nikko Chemicals Co., Ltd.) *11: Courtamine 86W (manufactured by Kao Corporation, active ingredient amount: 28% by mass) *12: Kalcol 8098 (manufactured by Kao Corporation) *13: Kalcol 220-80 (manufactured by Kao Corporation) *14: Ascorbic acid (Japanese Pharmacopoeia ascorbic acid, manufactured by Watanabe Chemical Co., Ltd.) *15: Purified anhydrous sodium sulfite (manufactured by Daito Chemical Co., Ltd.) *16: Food additive 75% phosphoric acid (manufactured by Nippon Chemical Industry Co., Ltd.)

[0079] From Tables 1 and 2, it can be seen that the one-part hair dye composition of the present invention can stably blend a specified melanin precursor and a specific direct dye, and as a result, a one-part hair dye composition can be produced that can achieve a wide variety of hair color expressions and that leaves hair feeling good after treatment.

[0080] As a formulation example of a one-part hair dye composition of the present invention, a one-part hair dye composition having the composition shown in Table 3 was obtained according to the following method.

[0081] Formulation Example 1 (Single-Part Hair Dye) 0.2 parts by mass of 2-amino-6-chloro-4-nitrophenol as component (B), 3.0 parts by mass of monoethanolamine as component (C), 1.0 part by mass of a 28% aqueous solution of stearyl trimethylammonium chloride (Cortamin 86W: manufactured by Kao Corporation) as component (E) (0.28 parts by mass as stearyl trimethylammonium chloride), purified water, and phosphoric acid were mixed in predetermined amounts to obtain a one-part hair dye composition with a pH of 10.2 and a concentration of 100 parts by mass. To this aqueous solution were added 2.0 parts by mass of polyoxyethylene (2) cetyl ether and 1.9 parts by mass of polyoxyethylene (40) cetyl ether as components (D), and 3.0 parts by mass of stearyl alcohol and 3.0 parts by mass of behenyl alcohol as components (F), to prepare an emulsifier. Furthermore, under a nitrogen atmosphere, 0.6 parts by mass of ascorbic acid, 0.35 parts by mass of sodium sulfite, and 25.0 parts by mass of an aqueous solution containing component (A) (0.25 parts by mass of component (A)) were added to obtain a one-component hair dye.

[0082] Formulation Example 2 (One-component hair dye) 0.2 parts by weight of Red No. 106 as component (B), 0.12 parts by weight of Purple No. 401, 0.2 parts by weight of Yellow No. 203, 3.0 parts by weight of monoethanolamine as component (C), 3.14 parts by weight of a 28% aqueous solution of stearyl trimethylammonium chloride (Cortamin 86W: manufactured by Kao Corporation) as component (E) (0.88 parts by weight as stearyl trimethylammonium chloride), purified water, and phosphoric acid were mixed in predetermined amounts to give a one-component hair dye composition of pH 10.2, 100 parts by weight. To this aqueous solution, 0.91 parts by weight of polyoxyethylene (2) cetyl ether and 2 parts by weight of polyoxyethylene (40) cetyl ether as components (D), and 2.2 parts by weight of stearyl alcohol and 2.8 parts by weight of behenyl alcohol as components (F) were added to prepare an emulsifier. Further, under a nitrogen atmosphere, 0.6 parts by mass of ascorbic acid, 0.35 parts by mass of sodium sulfite, and 25.0 parts by mass of an aqueous solution containing component (A) (0.25 parts by mass of component (A)) were added to obtain a one-component hair dye. Formulation Examples 1 and 2 are shown in Table 3.

[0083]

[0084] The one-component hair dyes of Formulation Examples 1 and 2 were evaluated for stability and feel in the same manner as in Examples 1 to 13, and were found to be good in all categories. Furthermore, the one-component hair dyes of Formulation Examples 1 and 2 were evaluated for color in the same manner as in Examples 1 to 13. Formulation Example 1 turned out to be a strong reddish yellow, while Formulation Example 2 turned out to be a dark gray with a yellow-reddish tint.

[0085] According to the one-part hair dye composition of the present invention, a predetermined melanin precursor and a specific direct dye can be stably blended, and as a result, a one-part hair dye composition can be provided that can achieve a wide variety of hair color expressions and that leaves hair feeling good after treatment.

Claims

1. The following components (A) to (E): (A) a compound represented by the following formula (1) or a salt thereof: (In formula (1), the dashed line indicates the presence or absence of a π bond. R １ represents a hydroxyl group or an acetoxy group. ２ represents a hydrogen atom or -COOR (wherein R is a hydrogen atom, a methyl group, or an ethyl group). ３ represents a hydrogen atom, an acetyl group, a methyl group, or an ethyl group.) A one-component hair dye composition comprising: (B) a neutral or anionic direct dye; (C) an alkaline agent; (D) a nonionic surfactant; and (E) a cationic surfactant, wherein the ratio (D) / (B) of the mass content of component (D) to the mass content of component (B) is 3.0 or more and 30.0 or less, and the pH is 8.0 or more and 11.0 or less.

2. The one-part hair dye composition according to claim 1, wherein the ratio (E) / (B) of the mass content of component (E) to the mass content of component (B) is 1 or more and 30 or less.

3. The one-part hair dye composition according to claim 1 or 2, wherein component (B) is one or more selected from the group consisting of 2-amino-6-chloro-4-nitrophenol, 4-hydroxypropylamino-3-nitrophenol, Red 106, Purple 401, and Yellow 203.

4. A one-part hair dye composition according to any one of claims 1 to 3, wherein component (B) contains 2-amino-6-chloro-4-nitrophenol.

5. A one-part hair dye composition according to any one of claims 1 to 4, wherein component (D) contains one or more members selected from the group consisting of polyoxyethylene alkyl ethers, polyoxyethylene hydrogenated castor oil, and alkyl saccharides.

6. A one-part hair dye composition according to any one of claims 1 to 5, wherein component (D) contains a polyoxyethylene alkyl ether.

7. A one-part hair dye composition according to any one of claims 1 to 6, wherein component (E) is a mono-long-chain alkyl quaternary ammonium salt represented by the following formula (3): (In formula (3), R ５ represents a linear alkyl group having 8 to 22 carbon atoms, and R ６ represents a linear alkyl group having 1 to 3 carbon atoms, and R ７ and R ８ represents a methyl group, and Y － indicates chloride ions.) 8. A one-part hair dye composition according to any one of claims 1 to 7, wherein component (E) contains one or more members selected from the group consisting of stearyltrimethylammonium chloride (steartrimonium chloride), behenyltrimethylammonium chloride, and cetyltrimethylammonium chloride (cetrimonium chloride).

9. A one-part hair dye composition according to any one of claims 1 to 7, wherein component (E) contains stearyltrimethylammonium chloride (steartrimonium chloride).

10. The one-part hair dye composition according to any one of claims 1 to 9, further comprising one or more members selected from the group consisting of sodium sulfite and ascorbic acid.

11. The one-part hair dye composition according to any one of claims 1 to 10, wherein component (C) contains monoethanolamine.

12. A one-part hair dye composition according to any one of claims 1 to 11, wherein the content of component (A) is 0.20% by mass or more and 0.50% by mass or less.

13. A one-part hair dye composition according to any one of claims 1 to 12, wherein the content of component (B) is 0.10% by mass or more and 0.5% by mass or less.

14. A one-part hair dye composition according to any one of claims 1 to 13, wherein the content of component (C) is 1% by mass or more and 3% by mass or less.

15. A one-part hair dye composition according to any one of claims 1 to 14, wherein the content of component (D) is 0.70% by mass or more.

16. A one-part hair dye composition according to any one of claims 1 to 14, wherein the content of component (D) is 1.1% by mass or more.

17. A one-part hair dye composition according to any one of claims 1 to 14, wherein the content of component (D) is 1.3 mass% or more.

18. A one-part hair dye composition according to any one of claims 1 to 14, wherein the content of component (D) is 6.0 mass% or less.

19. A one-part hair dye composition according to any one of claims 1 to 14, wherein the content of component (D) is 5.0 mass% or less.

20. A one-part hair dye composition according to any one of claims 1 to 14, wherein the content of component (D) is 4.5% by mass or less.

21. A one-part hair dye composition according to any one of claims 1 to 20, wherein the content of component (E) is 0.20% by mass or more.

22. A one-part hair dye composition according to any one of claims 1 to 20, wherein the content of component (E) is 0.50% by mass or more.

23. A one-part hair dye composition according to any one of claims 1 to 20, wherein the content of component (E) is 0.70% by mass or more.

24. A one-part hair dye composition according to any one of claims 1 to 20, wherein the content of component (E) is 5% by mass or less.

25. A one-part hair dye composition according to any one of claims 1 to 20, wherein the content of component (E) is 2% by mass or less.

26. A one-part hair dye composition according to any one of claims 1 to 20, wherein the content of component (E) is 1% by mass or less.

27. A one-part hair dye composition according to any one of claims 1 to 26, wherein the ratio (E) / (B) of the mass content of component (E) to the mass content of component (B) is 1 or greater.

28. A one-part hair dye composition according to any one of claims 1 to 26, wherein the ratio (E) / (B) of the mass content of component (E) to the mass content of component (B) is 3 or more.

29. A one-part hair dye composition according to any one of claims 1 to 26, wherein the ratio (E) / (B) of the mass content of component (E) to the mass content of component (B) is 25 or less.

30. A one-part hair dye composition according to any one of claims 1 to 26, wherein the ratio (E) / (B) of the mass content of component (E) to the mass content of component (B) is 20 or less.

31. A one-part hair dye composition according to any one of claims 1 to 26, wherein the ratio (E) / (B) of the mass content of component (E) to the mass content of component (B) is 15 or less.

32. A one-part hair dye composition according to any one of claims 1 to 26, wherein the ratio (E) / (B) of the mass content of component (E) to the mass content of component (B) is 9 or less.

33. A one-part hair dye composition according to any one of claims 1 to 26, wherein the ratio (E) / (B) of the mass content of component (E) to the mass content of component (B) is 5 or less.

34. A one-part hair dye composition according to any one of claims 1 to 33, wherein the ratio of the mass of component (E) to the total mass of component (A) and component (B) [(E) / {(A)+(B)}] is 0.5 or more.

35. A one-part hair dye composition according to any one of claims 1 to 33, wherein the ratio of the mass of component (E) to the total mass of component (A) and component (B) [(E) / {(A)+(B)}] is 1.5 or more.

36. A one-part hair dye composition according to any one of claims 1 to 33, wherein the ratio of the mass of component (E) to the total mass of component (A) and component (B) [(E) / {(A)+(B)}] is 7 or less.

37. A one-part hair dye composition according to any one of claims 1 to 33, wherein the ratio of the mass of component (E) to the total mass of component (A) and component (B) [(E) / {(A)+(B)}] is 2 or less.

38. A one-part hair dye composition according to any one of claims 1 to 37, further comprising a higher alcohol as component (F).

39. The one-part hair dye composition according to claim 38, wherein component (F) contains one or more alcohols selected from the group consisting of stearyl alcohol, behenyl alcohol, cetyl alcohol, and oleyl alcohol.

40. A one-part hair dye composition according to claim 38 or 39, wherein the content of component (F) is 4.0% by mass or more and 7% by mass or less.

41. A one-part hair dye composition according to any one of claims 1 to 40, which is filled in an oxygen-blocking container.

42. A method for dyeing hair by applying the one-part hair dye composition according to any one of claims 1 to 41 to hair.

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