Non-emulsified hair dye composition and hair dyeing method

Abstract

The present invention aims to provide a non-emulsified hair dye composition and a hair dyeing method that can dye hair with high saturation when used alone, and can also effectively improve the saturation of hair when used in combination with other agents. [Solution] A non-emulsifying hair dye composition comprising (A) 0.1 to 2% by mass of at least one dye selected from the group consisting of basic dyes and HC dyes, and (B) 0.05 to 8% by mass of a surfactant.

Description

Technical Field

[0001] The present invention relates to a non-emulsified hair dye composition and a hair dyeing method.

Background Art

[0002] Hair coloring products are generally classified into permanent hair dyes containing oxidative hair dyes (alkali dyes) and non-oxidative hair dyes, hair dyeing materials including semi-permanent hair dyes and temporary hair dyes, and decoloring and de-dyeing agents. As a hair dyeing method that enables high-chroma color expression, hair dyeing materials containing basic dyes such as color treatment using basic dyes and color shampoo are widely used. Hair dyeing materials containing basic dyes are used not only alone but also in a hair dyeing method that supplements chroma by mixing with other agents such as treatments not containing basic dyes and oxidative hair dyes.

[0003] As a hair dyeing composition that can achieve high-chroma hair dyeing, Patent Document 1 discloses a hair dyeing composition in which the proportion of the blending amount of a quaternary cationic dye in the total blending amount of all direct dyes is 80% by mass or more.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In hair dyeing methods that enhance saturation by mixing a hair dye containing basic dyes with other agents such as treatments or oxidative hair dyes that do not contain basic dyes, increasing the mixing ratio with other agents (basic dye-containing hair dye / other agent) to express highly saturated colors impairs the effectiveness and usability of the other agents. To solve this problem, it is preferable to reduce the mixing ratio by increasing the concentration of basic dyes contained in the basic dye-containing hair dye. However, if the basic dye-containing hair dye is a cream-type color treatment with high dyeing properties, incorporating a high concentration of basic dyes will cause the hair to be dyed too darkly when used alone, resulting in a decrease in saturation and making it difficult to express the vivid colors characteristic of basic dyes. On the other hand, if the basic dye-containing hair dye is a liquid color shampoo with low dyeing properties, incorporating a high concentration of basic dyes can prevent a decrease in hair saturation, but the anionic surfactant and basic dye in the basic dye-containing hair dye will interact and precipitate, making it difficult to ensure the stability of the formulation. To address these challenges, there is a need for a hair dye that maintains its high-saturation dyeing effect when used alone, while also effectively improving hair saturation when mixed with other dyes.

[0006] The hair dyeing composition described in Patent Document 1 has the drawback that basic dyes are prone to color changes and deactivation due to the influence of alkaline agents and pH, but the color changes when mixed with a lightener are suppressed by increasing the proportion of quaternary cationic dyes. However, there is no mention of the effect of the hair dyeing composition on the effectiveness and operability of other agents when mixed with the hair dyeing composition, and there has been insufficient consideration of the saturation of hair when the hair dyeing composition is used alone.

[0007] The present invention aims to provide a non-emulsified hair dye composition and a hair dyeing method that can dye hair with high saturation when used alone, and can also effectively improve the saturation of hair when used in combination with other agents. [Means for solving the problem]

[0008] The inventors diligently studied to solve the above problems. As a result, they found that the invention has the following configuration. We discovered that the aforementioned problems could be solved by this method, and thus completed the present invention. The present invention relates, for example, to the following [1] to

[11] . [1] A non-emulsified hair dye composition comprising (A) 0.1 to 2% by mass of at least one dye selected from the group consisting of basic dyes and HC dyes, and (B) 0.05 to 8% by mass of a surfactant. [2] The non-emulsifying hair dye composition according to [1], wherein the (B) surfactant is at least one selected from the group consisting of (B1) amphoteric surfactants and (B2) nonionic surfactants. [3] The (B1) amphoteric surfactant is a betaine acetate type amphoteric surfactant, The non-emulsified hair dye composition according to [2], wherein the (B2) nonionic surfactant is at least one selected from the group consisting of alkyl glucoside, polyoxyethylene alkyl ether, and alkanolamide. [4] A non-emulsified hair dye composition according to any one of [1] to [3], wherein the content of the surfactant (B) is 3 to 6% by mass. [5] A non-emulsified hair dye composition according to any one of [1] to [4], wherein at least one dye selected from the group consisting of (A) basic dyes and HC dyes is at least one selected from the group consisting of basic red 51, red 213, basic red 76, basic yellow 87, HC blue 15, HC blue 16, basic brown 16, basic brown 17, and basic orange 31. [6] A non-emulsified hair dye composition according to any one of [1] to [5], further comprising (C) 0.1 to 1.5% by mass of benzyl alcohol. [7] A non-emulsified hair dye composition according to any one of [1] to [6], further comprising 0.1 to 3% by mass of (E) fatty acids. [8] A non-emulsified hair dye composition according to any one of [1] to [7], further comprising (D) 0.5 to 10% by mass of a polyhydric alcohol. [9] A non-emulsified hair dye composition according to any one of [1] to [8], further comprising (F) 0.02 to 1.5% by mass of a cationic polymer.

[10] A step (α1) of foaming a non-emulsified hair dye composition described in any of [1] to [9] to obtain a first foamy hair dye composition, Step (α2) of applying the first foamy hair dye composition to the hair, (α3) A step in which the first foamy hair dye composition applied to the hair is further foamed on the hair to obtain a second foamy hair dye composition, and Step (α4) of applying the second foamy hair dye composition to the hair. Hair dyeing methods, including those mentioned above.

[11] A step (β1) of mixing a non-emulsified hair dye composition described in any of [1] to [9] with another agent to obtain a mixed hair dye composition, The steps include applying the mixed hair dye composition to the hair (β2), and After step (β2), step (β3) is performed to allow the mixed hair dye composition to act on the hair. Hair dyeing methods, including those mentioned above. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a non-emulsified hair dye composition and a hair dyeing method that can dye hair with high saturation when used alone, and can also effectively improve the saturation of hair when used in combination with other agents. [Modes for carrying out the invention]

[0010] Next, the present invention will be described in detail. Unless otherwise specified, the notation "A~B" in relation to a numerical range means that it is greater than or equal to A and less than or equal to B. Also, % refers to mass %.

[0011] [Non-emulsifying hair dye composition] In this specification, a non-emulsified hair dye composition means a hair dye composition that may contain water, oily components, and surfactants, but is not in an emulsified state.

[0012] [(A) At least one dye selected from the group consisting of basic dyes and HC dyes] The non-emulsified hair dye composition of the present invention contains at least one dye selected from the group consisting of (A) basic dyes and HC dyes (hereinafter also referred to as the “(A) component”) in an amount of 0.1 to 2% by mass based on 100% by mass of the non-emulsified hair dye composition.

[0013] The content of the (A) component in the non-emulsified hair dye composition is 0.1 to 2% by mass, preferably 0.2 to 1.8% by mass, more preferably 0.3 to 1.6% by mass. When the (A) component is less than 0.1% by mass, the effect of improving the chroma is impaired when mixed with other agents, and when it exceeds 2% by mass, the chroma when used alone begins to decrease.

[0014] The basic dye is not particularly limited, and examples thereof include Red No. 213, Red No. 214, Basic Blue 7, Basic Blue 9, Basic Blue 26, Basic Blue 75, Basic Blue 99, Basic Blue 124, Basic Red 2, Basic Red 22, Basic Red 51, Basic Red 76, Basic Yellow 57, Basic Yellow 87, Basic Orange 31, Basic Brown 16, Basic Brown 17, Basic Violet 2, Basic Violet 3, Basic Violet 4, Basic Violet 14.

[0015] The HC dye is not particularly limited, and examples thereof include HC Blue 2, HC Blue 6, HC Blue 7, HC Blue 8, HC Blue 9, HC Blue 10, HC Blue 11, HC Blue 12, HC Blue 15, HC Blue 16, HC Orange 1, HC Orange 2, HC Orange 3, HC Orange 31, HC Red 1, HC Red 3, HC Red 7, HC Red 10, HC Red 13, HC Red 14, HC Violet 1, HC Violet 2, HC Yellow 2, HC Yellow 4, HC Yellow 5, HC Yellow 6, HC Yellow 9, HC Yellow 10, HC Yellow 11, 1-amino-2-methyl-6-nitrobenzene, 1-amino-2-methyl-4-methylaminobenzene, 4-(2-hydroxyethyl)amino-3-nitro-methylbenzene, 1-bis(β-hydroxyethyl)amino-3-nitro-4-amino, 1-amino-2-benzene(β-hydroxypropylamino)benzene, 1-hydroxy-3-nitro-4-(3-hydrotoxypropylamino)benzene, 4-hydroxypropylamino-3-nitrophenol.

[0016] (A) component is less likely to cause a change in color tone due to influences such as pH, and has a great effect on improving the chroma when mixed with other agents. Therefore, it is preferably at least one selected from the group consisting of Basic Red 51, Red No. 213, Basic Red 76, Basic Yellow 87, HC Blue 15, HC Blue 16, Basic Brown 16, Basic Brown 17, and Basic Orange 31. From the perspective of the range of color expression, it is more preferably at least one selected from the group consisting of Basic Red 51, Red No. 213, Basic Yellow 87, HC Blue 16, Basic Brown 16, and Basic Orange 31.

[0017] (A) component can be used alone or in combination of two or more. However, when the number of types of (A) components combined increases, the chroma of the dyed hair is likely to decrease. Therefore, it is preferably used in 2 types or less.

[0018] [(B) Surfactant] The non-emulsified hair dye composition contains 0.05 to 8% by mass of (B) surfactant (hereinafter, also referred to as "(B) component") based on 100% by mass of the non-emulsified hair dye composition. The content of (B) component in the non-emulsified hair dye composition is 0.05 to 8% by mass, preferably 0.05 to 7% by mass, more preferably 3 to 7% by mass, and even more preferably 3 to 6% by mass. If it is less than 0.05% by mass, the foaming property becomes insufficient, and if it exceeds 8% by mass, the basic dye is likely to precipitate when the basic dye is highly formulated.

[0019] (B) component is not particularly limited, and known surfactants such as (B1) amphoteric surfactant, (B2) nonionic surfactant, or (B3) anionic surfactant can be used. Since (A) component is less likely to precipitate and it is easy to ensure the stability of the preparation, (B) component is preferably at least one selected from the group consisting of (B1) amphoteric surfactant and (B2) nonionic surfactant.

[0020] [(B1) Amphoteric surfactant] (B1) Amphoteric surfactants (hereinafter also referred to as "(B1) component") include, for example, betaine-type amphoteric surfactants, imidazoline-type amphoteric surfactants, amine oxide-type amphoteric surfactants, and phospholipids. Because they are easily and stably incorporated into formulations, component (B1) is preferably at least one selected from the group consisting of betaine-type amphoteric surfactants and imidazoline-type amphoteric surfactants, and more preferably a betaine-type amphoteric surfactant.

[0021] Examples of betaine-type amphoteric surfactants include aminoacetic acid betaine-type amphoteric surfactants and sulfobetaine-type amphoteric surfactants. Aminoacetic acid betaine-type amphoteric surfactants are preferred because they are easily and stably incorporated into pharmaceutical formulations. Examples of aminoacetic acid betaine-type amphoteric surfactants include coconut oil fatty acid amidopropyl betaine (cocamidopropyl betaine), lauric acid amidopropyl betaine (lauramidopropyl betaine), lauryl betaine, isostearamidopropyl betaine, and palm kernel fatty acid amidopropyl betaine.

[0022] Examples of sulfobetaine-type amphoteric surfactants include lauryl hydroxysultaine, lauramidopropyl hydroxysultaine, cocamidopropyl hydroxysultaine, sodium N-alkyl-N,N-dimethylammonium-N-propylsulfonate, sodium N-alkyl-N,N-dimethylammonium-N-(2-hydroxypropyl)sulfonate, and sodium N-fatty acid amidopropyl-N,N-dimethylammonium-N-(2-hydroxypropyl)sulfonate.

[0023] Examples of imidazoline-type amphoteric surfactants include sodium cocoamphoacetate (2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine), sodium lauroamphoacetate (sodium undecylenate-N-hydroxyethyl-N-carboxymethylimidazolinium betaine), and disodium cocoamphodiacetate (sodium N-coconut oil fatty acid acyl-N'-carboxyethyl-N'-hydroxyethylethylenediamine).

[0024] Examples of amine oxide-type amphoteric surfactants include lauramidopropyl dimethylamine oxide (lauramidopropylamine oxide) and lauramine oxide.

[0025] Component (B1) is preferably at least one selected from the group consisting of lauryl betaine, cocamidopropyl betaine, lauramidopropyl betaine, lauryl hydroxysultaine, and sodium cocoamphoacetate, as it is easily and stably incorporated into the formulation; more preferably at least one selected from the group consisting of lauryl betaine, cocamidopropyl betaine, and lauramidopropyl betaine; and even more preferably lauramidopropyl betaine. (B1) Component may be used alone or in combination of two or more types.

[0026] [(B2) Nonionic surfactant] (B2) Nonionic surfactants (hereinafter also referred to as "(B2) component") include, for example, alkyl glucosides such as lauryl glucoside, capryl glucoside, and decyl glucoside; sorbitan fatty acid esters; polyoxyethylene sorbitan fatty acid esters; polyoxyethylene hydrogenated castor oil; polyoxyethylene alkyl ethers such as oleth-2; polyoxyethylene polyoxypropylene alkyl ethers; polyoxyethylene fatty acid esters; polyoxyethylene cholestanol; polyoxyethylene phytostanol; alkanolamides such as cocamide methyl MEA; sugar esters; sugar ethers; sugar amides; saponins; and polyoxyethylene methyl glucoside. (B2) Component may be used alone or in combination of two or more types.

[0027] The component (B2) is preferably at least one selected from the group consisting of alkyl glucoside, polyoxyethylene alkyl ether, and alkanolamide, as it is easy to obtain good foam when used alone. More preferably, it is at least one selected from the group consisting of lauryl glucoside, oleth-2, and cocamide methyl MEA. Lauryl glucoside is even more preferably selected because it is easy to stably incorporate into formulations.

[0028] [(B3) Anionic surfactant] (B3) Anionic surfactants (hereinafter also referred to as "(B3) component") include, for example, sulfate-type anionic surfactants such as alkyl sulfates, alkenyl sulfates, polyoxyalkylene alkyl ether sulfates, polyoxyalkylene alkenyl ether sulfates, and alkylene alkylphenyl ether sulfates of sulfosuccinate; sulfonic acid-type anionic surfactants such as alkyl sulfosuccinate esters, polyoxyalkylene alkyl sulfosuccinate esters, and alkanesulfonates; higher fatty acid salts; and carboxylic acid-type anionic surfactants such as polyoxyalkylene alkyl ether carboxylic acids or salts thereof.

[0029] Component (B3) is preferably a sulfate-type anionic surfactant, more preferably a polyoxyalkylene alkyl ether sulfate, even more preferably a polyoxyethylene alkyl ether sulfate, and particularly preferably sodium laureth sulfate, due to its excellent foaming properties. (B3) Component may be used alone or in combination of two or more types.

[0030] [(C) Benzyl alcohol] The aforementioned non-emulsified hair dye composition is preferable to further contain 0.1 to 1.5% by mass of (C) benzyl alcohol (hereinafter also referred to as "component (C)") based on 100% by mass of the non-emulsified hair dye composition, as this facilitates the dissolution of large amounts of basic dyes. The content of component (C) is more preferably 0.2 to 1.2% by mass. When the content of component (C) is within the above range, skin irritation tends to be reduced.

[0031] [(D) Polyhydric alcohols] The aforementioned non-emulsified hair dye composition is preferable to further contain (D) polyhydric alcohol (hereinafter also referred to as "component (D)") in an amount of 0.5 to 10% by mass per 100% by mass of the non-emulsified hair dye composition, as this facilitates the dissolution of large amounts of basic dyes. The content of component (D) is more preferably 1 to 9% by mass, and even more preferably 2 to 8% by mass. When the content of component (D) is within the above range, it is easy to achieve high saturation dyeing.

[0032] (D) The component is not particularly limited, and various polyhydric alcohols can be used, for example, glycerin, diglycerin, propylene glycol, and dipropylene glycol. Among these, glycerin and diglycerin are preferred because they readily produce good foam when used alone and readily dissolve large amounts of dye. Component (D) may be used alone or in combination of two or more types.

[0033] [(E)Fatty acid] Since the aforementioned non-emulsified hair dye composition has excellent foam elasticity, it is preferable that it further contains 0.1 to 3% by mass of (E) fatty acid (hereinafter also referred to as "(E) component") based on 100% by mass of the non-emulsified hair dye composition. The content of component (E) is more preferably 0.5 to 2.5% by mass. When the content of component (E) is within the above range, the foam elasticity and stability of the formulation tend to be excellent.

[0034] Component (E) is not limited by its carbon number and can be any fatty acid, whether saturated, unsaturated, linear, or branched. Component (E) is a higher fatty acid having 10 or more carbon atoms, more preferably a higher fatty acid having 12 or more carbon atoms, and even more preferably a higher fatty acid having 12 to 24 carbon atoms. Component (E) is preferably a liquid fatty acid at 25°C, and examples of such fatty acids include oleic acid, linoleic acid, linolenic acid, and isostearic acid.

[0035] (E) Examples of components include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, 2-palmitoleic acid, oleic acid, ricinoleic acid, linoleic acid, linolenic acid, coconut oil fatty acids, and palm kernel oil fatty acids. Preferably, it is at least one selected from the group consisting of lauric acid, oleic acid, and isostearic acid, and more preferably oleic acid, because it is easy to incorporate stably into the formulation.

[0036] Component (E) may be a fatty acid salt, but is preferably a fatty acid. Examples of bases used to produce fatty acid salts include inorganic bases such as sodium, potassium, and magnesium; alkanolamines such as ammonium, monoethanolamine, diethanolamine, triethanolamine, and 2-amino-2-methylpropanol; and basic amino acids such as lysine and arginine. Component (E) may be used alone or in combination of two or more types.

[0037] In the non-emulsified hair dye composition, component (E) is in a solubilized state rather than an emulsified state due to surfactant (B).

[0038] [(F) Cationic polymer] Since the aforementioned non-emulsified hair dye composition has excellent foam retention, it is preferable that it further contains (F) a cationic polymer (hereinafter also referred to as "component (F)") in an amount of 0.02 to 1.5% by mass per 100% by mass of the non-emulsified hair dye composition. The content of component (F) is more preferably 0.05 to 1% by mass. When the content of component (F) is within the above range, the persistence of the foam and the stability of the formulation are good.

[0039] Component (F) is not particularly limited, and various cationic polymers can be used. Examples of component (F) include cationized cellulose derivatives such as polyquaternium-6, polyquaternium-10, and hydroxyethylcellulose dimethyldiallylammonium chloride copolymer; and cationized guar gum derivatives such as guar hydroxypropyltrimonium chloride. However, it is preferably at least one selected from the group consisting of polyquaternium-6 and guar hydroxypropyltrimonium chloride because it is easy to incorporate stably into the formulation. Component (F) may be used alone or in combination of two or more types.

[0040] [pH] In this specification, pH is the value measured at 25°C using a Horiba F-71 benchtop pH meter. If the non-emulsified hair dye composition (E) does not contain fatty acids, the pH of the non-emulsified hair dye composition is preferably 4.0 to 9.0, more preferably 5.0 to 8.0, and even more preferably 6.0 to 7.0.

[0041] When the non-emulsified hair dye composition contains a liquid fatty acid as (E) fatty acid, the pH of the non-emulsified hair dye composition is preferably 7.0 or higher, as it is easier to stably incorporate it into the formulation. When the non-emulsified hair dye composition contains a solid fatty acid as (E) fatty acid, the pH of the non-emulsified hair dye composition is preferably 8.0 or higher. When the pH is within the aforementioned range, it is possible to reduce damage to the hair without impairing the elasticity of the foam.

[0042] [Optional component] The aforementioned non-emulsified hair dye composition typically contains water. The water content is not particularly limited and can be adjusted as appropriate depending on the intended use. Specific examples of water include tap water, deionized water, distilled water, purified water, and natural water, with sterilized water being preferred. The non-emulsified hair dye composition contains, preferably, 80% by mass or more, more preferably 85% by mass or more, even more preferably 90% by mass or more, even more preferably 93% by mass or more, and particularly preferably 95% by mass or more of water in 100% by mass of the non-emulsified hair dye composition.

[0043] The non-emulsified hair dye composition may optionally contain, in addition to components (A) to (F), components commonly used in quasi-drugs or cosmetics, as long as it does not impair the effects of the present invention. Examples of optional components include oils, powders, thickeners, humectants, herbal medicines, pH adjusters, chelating agents, preservatives, antioxidants, cooling agents, vitamins, proteins, fragrances, antibacterial agents, and pigments (except for component (A)).

[0044] [Dosage Form] The properties of the non-emulsified hair dye composition are not particularly limited, but examples include liquid (lotion), gel, etc., and it may be in the form of an aerosol foam, pump foam, squeeze foam, or mist when used. A liquid form is preferred because it is easy to apply the agent to the hair and easy to mix with other agents. Liquid means that the viscosity at 25°C is 1 to 800 mPa·s, preferably 1 to 500 mPa·s. The appearance of the non-emulsified hair dye composition may be transparent, translucent, or opaque, among other things.

[0045] [Manufacturing method] The non-emulsified hair dye composition can be manufactured by stirring, mixing, heating, dissolving, dispersing, etc., using the above-mentioned components in the above-mentioned amounts, for example, by known methods, and the manufacturing method is not particularly limited. The manufacturing method may be carried out under heating conditions in order to uniformly mix each component. When manufacturing under heating conditions, for example, a temperature of 75 to 85°C can be given.

[0046] [How to use] The non-emulsified hair dye composition is not limited in its method of use and can be used, for example, by applying, spraying, or casting onto the hair, or by immersing the hair in the non-emulsified hair dye composition.

[0047] The aforementioned non-emulsified hair dye composition can be used on both dry and wet hair, but it is preferably applied to wet hair. The non-emulsified hair dye composition can be used on both normal and damaged hair, but because it is easily used to dye hair with high saturation, it is preferably used on damaged hair, and more preferably on bleached hair. The non-emulsified hair dye composition can be used on both undyed virgin hair and dyed hair, but it is preferably used on dyed hair because it can dye hair with high saturation without requiring advanced beauty techniques. Since the dyeing mechanisms of basic dyes and HC dyes differ from those of oxidation dyes, using the non-emulsified hair dye composition on hair dyed with alkaline color is even more preferable because it can improve uniformity of the dye.

[0048] The aforementioned non-emulsified hair dye composition is preferably a non-emulsified hair dye composition for application to hair in a foamy state. The aforementioned non-emulsified hair dye composition may be applied directly to the hair when used alone, but since it can dye the hair with high color saturation without requiring advanced beauty techniques, it is preferable to foam it up to create a first foamy hair dye composition suitable for application to the hair before applying it. Since the non-emulsified hair dye composition can dye hair with high color saturation without requiring advanced beauty techniques, it is preferable to lather it to obtain a first foamy hair dye composition suitable for application to hair, apply it to the hair, further lather the first foamy hair dye composition applied to the hair to obtain a second foamy hair dye composition, and then use the second foamy hair dye composition by applying it to the hair. The first foamy hair dye composition and the second foamy hair dye composition will be described later in the section on hair dyeing method (α).

[0049] Since the aforementioned non-emulsified hair dye composition can dye hair with high color saturation without impairing the effects of other agents, it is preferable to mix it with other agents to form a mixed hair dye composition and then apply it to the hair. Other agents will be discussed later in the section on hair dyeing methods (β).

[0050] The non-emulsified hair dye composition may be used alone, or multiple hair dye compositions containing different shades of (A) may be mixed at the time of use to create any desired color. This allows for the expression of a wide range of shades.

[0051] The aforementioned non-emulsified hair dye composition may be used consecutively after an oxidative hair dye. This allows for color correction after a hair coloring treatment with an oxidative hair dye.

[0052] [Hair dyeing method (α)] The hair dyeing method of the present invention includes the steps of: foaming the non-emulsified hair dye composition to obtain a first foamy hair dye composition (α1); applying the first foamy hair dye composition to the hair (α2); further foaming the first foamy hair dye composition applied to the hair to obtain a second foamy hair dye composition (α3); and allowing the second foamy hair dye composition to act on the hair (α4). The hair dyeing method is also hereinafter referred to as hair dyeing method (α).

[0053] [Process (α1)] Step (α1) is a step of foaming the non-emulsified hair dye composition to obtain a first foamy hair dye composition. Because the first foamy hair dye composition is foamy, it is easy to apply to hair even without advanced beauty techniques. The method for foaming the non-emulsified hair dye composition is not particularly limited, but is preferably a method of placing the non-emulsified hair dye composition in a container with a lid and shaking it up and down, more preferably a method of placing the non-emulsified hair dye composition (liquid) in a container with a lid having a capacity such that the gas-liquid mixing ratio (liquid:gas) is 1:4 to 1:30 and shaking it up and down, and even more preferably the foaming method (I) described below.

[0054] Foaming method (I): A bottomed cylindrical polypropylene container with an opening at the top and a roughly circular cross-section, with a bottom diameter of 78 mm, a height of 125 mm, and a full capacity of 507 mL, is placed in the container and the lid is closed. The container is shaken at 25°C, moving up and down 30 times at 3 times / second, 30 cm each time, to generate foam inside the container.

[0055] The degree to which the non-emulsified hair dye composition is foamed is not particularly limited, but preferably to the extent that the foam becomes thick and dense. When the first foamy hair dye composition is thick and dense, it is easy to apply a large amount of the hair dye composition to the hair even without advanced beauty techniques, making it easy to dye the hair with high color saturation.

[0056] [Process (α2)] Step (α2) is the step of applying the first foamy hair dye composition to the hair. The method for applying the first foamy hair dye composition to the hair is not particularly limited, and known methods can be used, for example, by applying, spraying, or casting the first foamy hair dye composition onto the hair; or by immersing the hair in the first foamy hair dye composition. Among these, the method of applying the first foamy hair dye composition onto the hair is preferred. The application may be done by spreading or massaging the first foamy hair dye composition onto the hair by hand, or by using a brush or comb.

[0057] The hair to which the first foamy hair dye composition is applied may be dry or wet, but it is preferable that it be wet in order to achieve a high-saturation dyeing effect. The hair to which the first foamy hair dye composition is applied may be normal hair or damaged hair, but it is preferably damaged hair, and more preferably bleached hair, as the high-saturation dyeing effect of the method of the present invention is easily achieved. The hair to which the first foamy hair dye composition is applied may be undyed virgin hair or dyed hair, but it is preferably dyed hair, and more preferably hair dyed with alkaline color, because the high-saturation dyeing effect of the method of the present invention is easily achieved.

[0058] [Process (α3)] Step (α3) is a step in which the first foamy hair dye composition applied to the hair is further foamed on the hair to obtain a second foamy hair dye composition. Step (α3) reduces the specific gravity of the foam in the first foamy hair dye composition, increasing the foam volume. This improves the foam volume and foam elasticity, making it easier to spread the foam throughout the hair and resulting in a more vibrant color.

[0059] The method for further foaming the first foamy hair dye composition on the hair is not particularly limited, but is preferably done by massaging it in with the hands, and may be done using a brush or comb if necessary. The method for further foaming the first foamy hair dye composition on the hair is, for example, to apply the foaming method (II) described below to a human head. Foaming method (II): Apply the entire amount of foam obtained by foaming method (I) to the hair of half a wig by hand, and rub it into the hair by hand for 1 minute to create foam.

[0060] The degree to which the first foamy hair dye composition is foamed is not particularly limited, but preferably to such an extent that the specific gravity of the second foamy hair dye composition becomes less than the specific gravity of the first foamy hair dye composition.

[0061] This second foamy hair dye composition spreads easily throughout the hair, making it easier to achieve high-saturation coloring.

[0062] [Process (α4)] Step (α4) is a step in which the second foamy hair dye composition is applied to the hair. In step (α4), the hair is dyed with the second foamy hair dye composition. The temperature at which step (α4) is performed is not particularly limited as long as it is below 40°C, but it is preferably at room temperature (15-25°C). The processing time is not particularly limited and can be set appropriately according to the temperature and the desired degree of hair dyeing. Preferably, the processing time is 30 seconds to 30 minutes, more preferably 1 to 15 minutes, and even more preferably 5 to 10 minutes.

[0063] The hair dyeing method (α) preferably includes a rinsing step after step (α4) in which the second foamy hair dye composition is washed off the hair.

[0064] [Hair dyeing method (β)] The hair dyeing method of the present invention includes the steps of: mixing the non-emulsified hair dye composition with another agent to obtain a mixed hair dye composition (β1); applying the mixed hair dye composition to the hair (β2); and allowing the mixed hair dye composition to act on the hair after step (β2) (β3). The hair dyeing method is also hereinafter referred to as hair dyeing method (β).

[0065] [Process (β1)] Step (β1) is a step of mixing the non-emulsified hair dye composition with other agents to obtain a mixed hair dye composition. The aforementioned other agents are not particularly limited as long as they are compositions applied to hair, but are preferably oxidative hair dyes (alkaline colorants), treatments, shampoos, and hair treatment agents, and more preferably oxidative hair dyes (alkaline colorants) and treatments.

[0066] Oxidative hair dyes (alkaline hair dyes) typically consist of an oxidative hair dyeing agent (Part 1) and an oxidative hair dyeing agent (Part 2). The aforementioned other agent may be a mixture of the first oxidative hair dyeing agent and the second oxidative hair dyeing agent, or it may be the first oxidative hair dyeing agent alone, or the second oxidative hair dyeing agent alone.

[0067] The first agent for oxidative hair dyeing usually contains an alkaline agent. The first agent for oxidative hair dyeing may further contain an oxidative dye, or it may be a lightener that does not contain an oxidative dye.

[0068] Oxidation dyes are compounds that can develop color through oxidative polymerization with an oxidizing agent. Oxidation dyes are not particularly limited, but examples include known dye intermediates, couplers, and melanin precursors.

[0069] Examples of alkaline agents include ammonia, alkanolamines, organic amines (2-amino-2-methyl-1,3-propanediol, guanidine, etc.), inorganic alkalis (anhydrous sodium sulfite, sodium hydroxide, potassium hydroxide, etc.), carbonates (sodium carbonate, potassium carbonate, ammonium carbonate, ammonium bicarbonate, etc.), basic amino acids (arginine, lysine, etc.) and their salts. Specific examples of alkanolamines include monoethanolamine, diethanolamine, triethanolamine, monopropanolamine, isopropanolamine, dipropanolamine, tripolamine, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and 2-amino-2-hydroxymethyl-1,3-propanediol. Alkaline agents may be formulated individually or in combination of two or more. Among these alkaline agents, ammonia is preferred due to its high versatility. The content of the alkaline agent in the first agent for oxidative hair dyeing is not particularly limited, but is preferably 0.5 to 15% by mass.

[0070] The first agent for oxidative hair dyeing may contain other optional components that do not fall under the category of alkaline agents and oxidative dyes. Examples of optional components include water such as deionized water, higher alcohols such as cetanol, oils such as liquid paraffin, nonionic surfactants such as polyoxyethylene cetyl ether and polyoxyethylene behenyl ether, cationic surfactants such as cetyltrimethylammonium chloride, solvents such as propylene glycol, chelating agents such as tetrasodium hydroxyethanediphosphonate, and pH adjusters such as phosphoric acid, citric acid, and sodium citrate.

[0071] The dosage form of the first agent for oxidative hair dyeing is not particularly limited, but is preferably an emulsion, and more preferably an oil-in-water emulsion. The properties of the first agent for oxidative hair dyeing are not particularly limited, but are preferably in the form of a foam, cream, or emulsion, and more preferably a cream.

[0072] The second agent for oxidative hair dyeing typically contains an oxidizing agent. Oxidizing agents are added to cause oxidative polymerization of oxidative dyes to develop color, and also to decolorize the melanin contained in the hair. Specific examples of oxidizing agents include hydrogen peroxide, urea peroxide, melanin peroxide, sodium percarbonate, potassium percarbonate, sodium perborate, potassium perborate, sodium peroxide, potassium peroxide, magnesium peroxide, barium peroxide, calcium peroxide, strontium peroxide, hydrogen peroxide adducts of sulfates, hydrogen peroxide adducts of phosphates, and hydrogen peroxide adducts of pyrophosphates. These oxidizing agents may be added individually or in combination of two or more. Among these oxidizing agents, hydrogen peroxide is preferred because of its excellent melanin decolorizing power. The content of the oxidizing agent in the second agent for oxidative hair dyeing is not particularly limited, but is preferably 1 to 6% by mass.

[0073] The second agent for oxidative hair dyeing may contain optional ingredients that are not oxidizing agents. Examples of optional ingredients include water such as deionized water, higher alcohols such as cetanol, oils such as liquid paraffin, nonionic surfactants such as polyoxyethylene cetyl ether and polyoxyethylene behenyl ether, cationic surfactants such as cetyltrimethylammonium chloride, solvents such as propylene glycol, chelating agents such as tetrasodium hydroxyethanediphosphonate, and pH adjusters such as phosphoric acid, citric acid, and sodium citrate.

[0074] The dosage form of the second agent for oxidative hair dyeing is not particularly limited, but is preferably an emulsion, and more preferably an oil-in-water emulsion. The properties of the second agent for oxidative hair dyeing are not particularly limited, but are preferably in the form of a foam, cream, or emulsion, and more preferably a cream.

[0075] The non-emulsified hair dye composition, even when mixed with an oxidative hair dye as another agent, does not impair the operability of the oxidative hair dye or its effect (hair dyeing effect by oxidative dyes), and furthermore, the hair dyeing effect of component (A) contained in the non-emulsified hair dye composition is obtained, making it easy to effectively improve the saturation of the hair.

[0076] The formula of a treatment is not restricted as long as it is a well-known hair treatment. The treatment contains, for example, one or more components selected from the group consisting of water such as ion-exchanged water, higher alcohols such as cetanol, oils such as isopropyl myristate, silicone oils such as dimethicone and amodimethicone, waxes such as octyldodecyl lanolinate, cationic surfactants such as steartrimonium chloride, nonionic polymers such as (hydrogenated castor oil / sebacic acid) copolymer, preservatives such as phenoxyethanol, and pH adjusters such as phosphoric acid, citric acid, and sodium citrate.

[0077] The dosage form of the treatment is not particularly limited, but is preferably an emulsion, more preferably an oil-in-water emulsion. The properties of the treatment are not particularly limited, but are preferably foamy, creamy, or lotiony, and more preferably creamy.

[0078] The non-emulsified hair dye composition, when mixed with other treatment agents, does not impair the operability or effectiveness (hair texture) of the treatment, and furthermore, the hair dyeing effect is obtained from component (A) contained in the non-emulsified hair dye composition, making it easy to effectively improve the color of the hair.

[0079] The formulation of a shampoo or hair treatment agent is not restricted, as long as it is known as such. The aforementioned non-emulsified hair dye composition, when mixed with shampoo as another agent, does not impair the usability or effectiveness (cleansing effect) of the shampoo, and furthermore, the hair dyeing effect is obtained from component (A) contained in the non-emulsified hair dye composition, making it easy to effectively improve the color of the hair. The aforementioned non-emulsified hair dye composition, even when mixed with other hair treatment agents, does not impair the operability or effectiveness (hair deformation effect) of the hair treatment agent, and furthermore, the hair dyeing effect is obtained from component (A) contained in the aforementioned non-emulsified hair dye composition, making it easy to effectively improve the saturation of the hair.

[0080] The mixing ratio of the non-emulsified hair dye composition to the other agent depends on the dosage form and viscosity of the non-emulsified hair dye composition and the other agent, but is preferably 0.05:100 to 30:100, more preferably 1:100 to 20:100, and even more preferably 5:100 to 10:100. Mixing within this range is less likely to impair the effectiveness and operability of the other agent, and is more likely to effectively improve the color of the hair.

[0081] The method for mixing the non-emulsified hair dye composition with other agents is not particularly limited and can be done using tools such as stirrers, spatulas, whisks, or devices such as stick mixers. The time and extent of mixing the non-emulsified hair dye composition with other agents are not limited; it is sufficient to mix them to a degree that makes them easy to apply to the hair. The non-emulsified hair dye composition may be foamed up to form a foamy mixed hair dye composition by mixing it with other agents before mixing it with other agents, or after mixing the non-emulsified hair dye composition with other agents.

[0082] [Process (β2)] Step (β2) is the step of applying the mixed hair dye composition to the hair. The method of applying the mixed hair dye composition to the hair is not particularly limited, and known methods can be used, for example, by applying, spraying, or casting the mixed hair dye composition onto the hair; or by immersing the hair in the mixed hair dye composition. Among these, the method of applying the mixed hair dye composition onto the hair is preferred. The application may be done by spreading or massaging the mixed hair dye composition onto the hair with the hands, or by using a brush or comb.

[0083] The hair to which the mixed hair dye composition is applied may be dry or wet, but from the viewpoint of enhancing the dyeing effect, it is preferable that it be dry. The hair to which the mixed hair dye composition is applied may be normal hair or damaged hair, but is preferably damaged hair, and more preferably bleached hair.

[0084] [Process (β3)] Step (β3) is a step in which the mixed hair dye composition is applied to the hair after step (β2). In step (β3), the hair is dyed with the mixed hair dye composition. The temperature at which step (β3) is performed is not particularly limited as long as it is 40°C or lower, but it is preferably room temperature (15-25°C). The processing time is not particularly limited and can be set appropriately according to the temperature and the desired degree of hair dyeing. Preferably, the processing time is 30 seconds to 40 minutes, more preferably 1 to 30 minutes, and even more preferably 5 to 20 minutes.

[0085] The hair dyeing method (β) preferably includes a rinsing step after step (β3) in which the mixed hair dye composition is washed off the hair. [Examples]

[0086] The present invention will now be described in more detail with reference to examples, but the present invention is not limited thereto.

[0087] <Examples 1-43, Comparative Examples 1-5> Non-emulsified hair dye compositions were prepared by mixing the components using the commercially available products listed in Table 1 according to the formulations shown in Tables 2 to 6, and these were used as samples for the evaluations described below. In Tables 2 to 6, the numerical values ​​for the formulations in Examples 1 to 43 and Comparative Examples 1 to 5 represent the mass percentage of each component when the non-emulsified hair dye composition is considered to be 100% by mass, and the values ​​are shown in terms of pure content.

[0088] [Table 1]

[0089] <1. Method for evaluating the stability of the formulation> The samples were placed in PET (polyethylene terephthalate) containers, sealed, and left in a constant temperature bath at 50°C for one month. Changes were then observed. ◎: No problem at all. ○: Slight precipitation or clouding of the dye may be observed, but this does not affect the dyeing process. △: Dye precipitation or clouding is observed, indicating reduced dyeing ability. ×: Separation of the formulation is observed.

[0090] <2. Method for evaluating color when using a single item> 20 g of the sample was placed in a 450 mL shaker container (CPI-450, manufactured by Takemoto Container Co., Ltd.) and shaken 30 times at 25°C, moving it up and down 30 cm each way at a rate of 3 times per second. The shaker container is a bottomed cylindrical polypropylene container with an opening at the top and a roughly circular cross-section. Its base diameter is 78 mm, its height is 125 mm, and its full capacity is 507 mL. Immediately after shaking, the lid of the shaker container was opened, and 0.5g of the foam formed inside the container was applied to bleached hair (BR-3, manufactured by Beaulux) to dye the bleached hair. After leaving it for 5 minutes, it was rinsed with water at about 40°C, towel-dried, and then dried with a hairdryer.

[0091] A. Staining ability Bleached hair after dyeing was evaluated according to the following criteria. ◎◎: It is visually apparent that the bleached hair has been dyed very well. ◎: It is visually clear that the bleached hair has been dyed well. ○: It is visually apparent that the bleached hair has been slightly dyed. ×: It is visually apparent that the bleached hair has not been dyed very well.

[0092] B. Saturation The saturation of bleached hair after dyeing was evaluated according to the following criteria. ◎◎: It is visually apparent that the bleached hair has been dyed very vividly. ◎: It is visually apparent that the bleached hair has been dyed vividly. ○: It is visually apparent that the bleached hair has been dyed a dull color. ×: It is visually apparent that the bleached hair has not been dyed very well.

[0093] <3. Method for evaluating saturation during mixing> The saturation of the color when the sample was mixed with other agents before dyeing was evaluated using the following method. Lightener was manufactured by mixing the components according to the formulation shown in Table 7. Alkaline color second agent (oxidizing agent) was manufactured by mixing the components according to the formulation shown in Table 8. 0.5g of the sample was mixed with 1.7g of lightener and 3.4g of alkaline color developer (oxidizing agent), and applied to bleached hair (BR-3, manufactured by Beaulux) with a brush to dye the hair. After 20 minutes, it was rinsed with water at approximately 40°C, towel-dried, and then dried with a hairdryer. The saturation of the bleached hair after dyeing was then evaluated according to the following criteria. ◎◎: It is visually apparent that the bleached hair has been dyed very vividly. ◎: It is visually apparent that the bleached hair has been dyed vividly. ○: It is visually apparent that the bleached hair has been dyed a dull color. ×: It is visually apparent that the bleached hair has not been dyed very well.

[0094] <4. Effects of other agents when mixed> The effect of the sample on the efficacy of other agents when used in a mixture with the sample was evaluated using the following method. The treatment was manufactured by mixing each ingredient according to the formulation shown in Table 9. 0.1g of the sample was mixed with 5.0g of treatment, and 1.0g was applied to a hair bundle (BS-B3A, manufactured by Beaulux). After rinsing with water at approximately 40°C, towel drying, and drying with a hairdryer, 10 professional panelists (hairdressers) each evaluated the texture compared to a blank hair bundle treated with only the treatment, according to the following criteria. As a comparative example, a sample with a different dye concentration than the example was mixed in an amount that resulted in the same dyeing (final concentration) as the example, and the same evaluation was performed. 4 points: The feel and manageability are about the same as a blank. 3 points: Compared to the blank, the feel and cohesion are slightly worse. Points 2: Compared to the blank, it has poor feel and manageability. 1 point: Compared to the blank, the feel and cohesion are significantly worse.

[0095] The average of the evaluation scores from the 10 participants was calculated, and the evaluations were made as follows. ◎: The average rating from the 10 professional panelists (hairdressers) is 3.5 points or higher. ○: The average evaluation score from the 10 professional panelists (hairdressers) is between 2.5 and 3.5 points. △: The average rating from the 10 professional panelists (hairdressers) is between 1.5 and 2.5 points. ×: The average rating from the 10 professional panelists (hairdressers) is less than 1.5 points.

[0096] <5. Ease of use during mixing> The ease of use when mixing the sample with other agents was evaluated using the following method. Ten professional panelists (hairdressers) each evaluated the operability during application as described in section 4, according to the following criteria. 4 points: The coating performance is about the same as the blank. 3 points: Although a change in viscosity is noticeable compared to the blank, it does not affect the application performance. Two points: Viscosity changes compared to the blank, resulting in poor coating performance. Point 1: There is a clear change in viscosity compared to the blank, making uniform application difficult.

[0097] ◎: The average rating from the 10 professional panelists (hairdressers) is 3.5 points or higher. ○: The average evaluation score from the 10 professional panelists (hairdressers) is between 2.5 and 3.5 points. △: The average rating from the 10 professional panelists (hairdressers) is between 1.5 and 2.5 points. ×: The average rating from the 10 professional panelists (hairdressers) is less than 1.5 points.

[0098] <6. Evaluation Method for Foam Elasticity> Ten professional panelists (hairdressers) each applied the foam, which had been shaken 30 times immediately after use as described in "2. Method for evaluating color when used alone," to half of a wig (Tokyo Charm No. 5, manufactured by Mitsuya Co., Ltd.) by hand, and evaluated the foam's elasticity according to the following criteria. 4 points: It is very elastic and easy to apply evenly to the entire hair. 3 points: It has a slightly elastic texture and can be applied evenly to the entire hair. Points 2: It lacks elasticity, but it can be applied to the entire hair. 1. It lacks elasticity, and the foam collapses before it can be applied to the entire hair.

[0099] The average of the evaluation scores from the 10 participants was calculated, and the evaluations were made as follows. ◎◎: The average rating from the 10 professional panelists (hairdressers) is 3.5 points or higher. ◎: The average rating from the 10 professional panelists (hairdressers) is between 2.5 and 3.5 points. ○: The average rating from the 10 professional panelists (hairdressers) is between 1.5 and 2.5 points. ×: The average rating from the 10 professional panelists (hairdressers) is less than 1.5 points.

[0100] <7. Evaluation Method for Foam Durability> Ten professional panelists (hairdressers) each applied the foam, which had been shaken 30 times immediately after use as described in "2. Method for evaluating color when used alone," to half of a wig (Tokyo Charm No. 5, manufactured by Mitsuya Co., Ltd.). After 5 minutes, they evaluated the foam's persistence (presence or absence of dripping) according to the following criteria. 4 points: Absolutely no dripping. 3 points: There are fewer bubbles, but it is not dripping. 2 points: The foam is gone, and liquid is accumulating at the ends of the hair. 1 point: It is dripping.

[0101] The average of the evaluation scores from the 10 participants was calculated, and the evaluations were made as follows. ◎: The average rating from the 10 professional panelists (hairdressers) is 3.5 points or higher. ○: The average evaluation score from the 10 professional panelists (hairdressers) is between 2.5 and 3.5 points. △: The average rating from the 10 professional panelists (hairdressers) is between 1.5 and 2.5 points. ×: The average rating from the 10 professional panelists (hairdressers) is less than 1.5 points.

[0102] <8. Method for evaluating texture (cohesion, smoothness)> Ten professional panelists (hairdressers) each applied 1.0g of the foam, immediately after shaking it 30 times as described in "2. Method for evaluating color when using the product alone," to a strand of hair (BS-B3A, manufactured by Beaulux). After rinsing with water at approximately 40°C, towel-drying, and drying with a hairdryer, they evaluated the texture (manageability, ease of combing) according to the following criteria.

[0103] Evaluation criteria for "cohesion" 4 points: Very well put together. 3 points: Well put together. 2 points: It's fairly well put together. 1 point: It's not well-organized.

[0104] Evaluation criteria for "smoothness of touch" 4 points: Very smooth to the touch. 3 points: Smooth to the touch. Points 2: Slightly smooth to the touch. 1 point: It doesn't go through easily.

[0105] [Table 2]

[0106] [Table 3]

[0107] [Table 4]

[0108] [Table 5]

[0109] [Table 6]

[0110] [Table 7]

[0111] [Table 8]

[0112] [Table 9]

[0113] The non-emulsified hair dye compositions prepared in Examples 1-43 yielded favorable results in all evaluation items. The non-emulsified hair dye composition of the present invention can dye hair with high saturation when used alone, and can also effectively improve the saturation of hair when used in combination with other agents.

[0114] The non-emulsified hair dye compositions produced in Comparative Examples 1 and 2 contained less than the specified amount of dye (A). As a result, they could not dye hair with high saturation when used alone, nor could they sufficiently improve the saturation of the hair when mixed with other agents.

[0115] The non-emulsified hair dye composition produced in Comparative Example 3 had a higher-than-specified amount of dye (A) contained in it, resulting in a loss of stability. When used alone, it caused the hair to be dyed too intensely, leading to a decrease in color saturation.

[0116] The non-emulsified hair dye composition produced in Comparative Example 4 lacked stability and sufficient handling properties when mixed with other agents because it contained more surfactant (B) than the specified amount.

[0117] The non-emulsified hair dye composition produced in Comparative Example 5 contained a higher-than-specified amount of surfactant (B) than required, resulting in a lack of stability in the formulation, poor dyeing performance when used alone, and insufficient handling when mixed with other agents.

Claims

1. A non-emulsified hair dye composition comprising (A) 0.1 to 2% by mass of at least one dye selected from the group consisting of basic dyes and HC dyes, and (B) 0.05 to 8% by mass of a surfactant.

2. The non-emulsifying hair dye composition according to claim 1, wherein the (B) surfactant is at least one selected from the group consisting of (B1) amphoteric surfactants and (B2) nonionic surfactants.

3. The (B1) amphoteric surfactant is a betaine acetate type amphoteric surfactant, The non-emulsifying hair dye composition according to claim 2, wherein the (B2) nonionic surfactant is at least one selected from the group consisting of alkyl glucoside, polyoxyethylene alkyl ether, and alkanolamide.

4. The non-emulsifying hair dye composition according to claim 1 or 2, wherein the content of the surfactant (B) is 3 to 6% by mass.

5. The non-emulsified hair dye composition according to claim 1 or 2, wherein at least one dye selected from the group consisting of (A) basic dyes and HC dyes is at least one selected from the group consisting of basic red 51, red 213, basic red 76, basic yellow 87, HC blue 15, HC blue 16, basic brown 16, basic brown 17, and basic orange 31.

6. The non-emulsified hair dye composition according to claim 1 or 2, further comprising (C) 0.1 to 1.5% by mass of benzyl alcohol.

7. The non-emulsified hair dye composition according to claim 1 or 2, further comprising (E) 0.1 to 3% by mass of fatty acid.

8. Furthermore, the non-emulsified hair dye composition according to claim 1 or 2, comprising (D) 0.5 to 10% by mass of a polyhydric alcohol.

9. The non-emulsified hair dye composition according to claim 1 or 2, further comprising (F) 0.02 to 1.5% by mass of a cationic polymer.

10. A step (α1) of foaming the non-emulsified hair dye composition according to claim 1 or 2 to obtain a first foamy hair dye composition, Step (α2) of applying the first foamy hair dye composition to the hair, The first foamy hair dye composition applied to the hair is further foamed on the hair to obtain a second foamy hair dye composition (α3), and Step (α4) of applying the second foamy hair dye composition to the hair. Hair dyeing methods, including those mentioned above.

11. A step (β1) of mixing the non-emulsified hair dye composition according to claim 1 or 2 with another agent to obtain a mixed hair dye composition, The steps include applying the mixed hair dye composition to the hair (β2), and After the above step (β2), a step (β3) is performed to allow the mixed hair dye composition to act on the hair. Hair dyeing methods, including those mentioned above.

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