Hair dye composition and hair dyeing method

Abstract

The present invention aims to provide a hair dye composition and hair dyeing method that achieve both uniform coloring and deep coloring without requiring advanced beauty techniques. [Solution] A hair dye composition comprising (A) at least one dye selected from the group consisting of basic dyes, HC dyes, acid dyes, and nitro dyes, (B) 0.1 to 10% by mass of a foaming agent (excluding components that fall under (C) below), and (C) at least one component selected from the group consisting of (C1) nonionic surfactants, (C2) polyhydric alcohols, and (C3) fatty acids, wherein the mass ratio (A) / (C) of (A) to (C) is 0.7 or less.

Description

[Technical Field]

[0001] The present invention relates to a hair dye composition and a hair dyeing method. [Background technology]

[0002] Hair coloring products are generally classified into permanent hair dyes, which include oxidative and non-oxidative hair dyes; hair dyes, which include semi-permanent and temporary hair dyes; and bleaching and decolorizing agents. As a hair dyeing method that causes less damage compared to oxidative hair dyes, semi-permanent hair dyes such as color treatments and color shampoos are widely used. Because color treatments are in a creamy form, they have high dyeing properties and can achieve deep coloring. However, they also have the drawback of requiring advanced hairdressing techniques such as sectioning to apply evenly to the hair, and the dyeing process is time-consuming. In addition, uneven coloring is important because deep coloring can result in noticeable unevenness.

[0003] Color shampoos offer a quick and easy way to dye hair, but they generally contain a lot of surfactants and are liquid, which impairs the dye's ability to adhere. Furthermore, the small amount that can be applied to the hair prevents deep coloring. Additionally, because color shampoos are typically lathered on the hair before use, it's difficult to achieve even and uniform coloring of each individual strand. To address these challenges, there is a need for hair dyes that do not require advanced technology and that achieve both uniform coloring and deep coloring.

[0004] As a hair dyeing composition that improves the dyeing properties of color shampoo, Patent Document 1 discloses a hair dyeing composition in which the total amount of surfactants is 12% by weight or less, and the amount of anionic surfactants is limited to 50% by weight or less of the total amount of surfactants. Patent Document 2 discloses a hair dyeing composition that allows for easy and even dyeing with minimal damage, and is characterized by being used as a foam for dyeing. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-158878 [Patent Document 2] Japanese Patent Publication No. 2023-006942 [Overview of the project] [Problems that the invention aims to solve]

[0006] The hair dyeing composition described in Patent Document 1 has stable dyeing properties and, as a result, reduces irritation by reducing the amount of dye used. However, its ability to dye intensely has not been considered, and its ease of application and uniform dyeing are not entirely satisfactory.

[0007] While the hair dye composition described in Patent Document 2 improves not only dyeing ability but also ease of application and uniform dyeing compared to color shampoos by forming a foam, the formation of a foam with a high gas content, which is intended for use with pump foamers or aerosols, limits the amount of hair dye composition that can be used, resulting in insufficient dyeing intensity.

[0008] The present invention aims to provide a hair dye composition and hair dyeing method that achieve both uniform coloring and deep coloring without requiring advanced beauty techniques. [Means for solving the problem]

[0009] 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

[10] . [1] A hair dye composition comprising (A) at least one dye selected from the group consisting of basic dyes, HC dyes, acid dyes, and nitro dyes, (B) 0.1 to 10% by mass of a foaming agent (excluding components that fall under (C) below), and (C) at least one component selected from the group consisting of (C1) nonionic surfactants, (C2) polyhydric alcohols, and (C3) fatty acids, wherein the mass ratio (A) / (C) of (A) to (C) is 0.7 or less. [2] The hair dye composition according to [1], wherein the (B) foaming agent is at least one selected from the group consisting of (B1) anionic surfactant, (B2) amphoteric surfactant, and (B3) propellant. [3] The hair dye composition according to [1] or [2], comprising a (C3) fatty acid as the (C) component. [4] The hair dye composition according to any one of [1] to [3], wherein the (C3) fatty acid is a higher fatty acid having 10 or more carbon atoms. [5] A hair dye composition according to any one of [1] to [4], wherein the content of component (A) is 0.01 to 2% by mass. [6] A hair dye composition according to any one of [1] to [5], further comprising (D) 0.05 to 1.5% by mass of a cationic polymer. [7] The hair dye composition according to [6], wherein the (D) cationic polymer is at least one selected from the group consisting of polyquaternium-6 and guar hydroxypropyltrimonium chloride. [8] A hair dye composition according to any one of [1] to [7], wherein the specific gravity of the foam obtained by the foaming method (I) described below is 0.04 to 0.2. 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. [9] The hair dye composition according to any one of [1] to [8], wherein the hair dye composition is a hair dye composition for application to hair in a foamy state.

[10] A step (α1) of foaming a 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. A hair dyeing method comprising

Advantages of the Invention

[0010] According to the present invention, it is possible to provide a hair dye composition and a hair dyeing method that do not require advanced beauty techniques and achieve both uniform dyeing and deep dyeing properties.

Brief Description of the Drawings

[0011] [Figure 1] Figure 1 is a photograph of the foam of the "◎" evaluation in the "1. Evaluation method of foaming property". [Figure 2] Figure 2 is a photograph of the foam of the "△" evaluation in the "1. Evaluation method of foaming property".

Modes for Carrying Out the Invention

[0012] Next, the present invention will be specifically described. The description of "A to B" regarding a numerical range means A or more and B or less unless otherwise specified. Also, % means mass %.

[0013] [(A) Dye] The hair dye composition of the present invention contains at least one dye selected from the group consisting of (A) basic dyes, HC dyes, acid dyes, and nitro dyes (hereinafter also referred to as "(A) component").

[0014] The content of the (A) component in the hair dye composition is preferably 0.01 to 2% by mass, more preferably 0.1 to 1.5% by mass in 100% by mass of the hair dye composition. When the content of the (A) component is within the above range, problems with skin staining are less likely to occur.

[0015] Basic dyes are not particularly limited, but examples include Red 213, Red 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, and Basic Violet 14.

[0016] HC dyes are not particularly limited, but examples 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, and 1-amino-2-methyl-6-nitroben Examples include zen, 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-hydroxypropylamino)benzene, and 4-hydroxypropylamino-3-nitrophenol.

[0017] Examples of acid dyes include Red No. 2, Red No. 3, Red No. 102, Red No. 104(1), Red No. 105(1), Red No. 106, Red No. 201, Red No. 213, Red No. 227, Red No. 230(1), Red No. 230(2), Red No. 231, Red No. 232, Red No. 401, Red No. 502, Red No. 503, Red No. 504, Red No. 506, Orange No. 205, Orange No. 207, and Orange No. 402. Examples include Yellow No. 4, Yellow No. 5, Yellow No. 202 (1), Yellow No. 202 (2), Yellow No. 203, Yellow No. 402, Yellow No. 403 (1), Yellow No. 406, Yellow No. 407, Blue No. 1, Blue No. 2, Blue No. 202, Blue No. 203, Blue No. 205, Green No. 3, Green No. 201, Green No. 204, Green No. 205, Green No. 401, Green No. 402, Brown No. 201, Black No. 401, and Purple No. 401.

[0018] Examples of nitro dyes that can be used include 4-nitro-o-phenylenediamine, 2-nitro-p-phenylenediamine, 2-amino-4-nitrophenol, 2-amino-5-nitrophenol, picramic acid, picric acid, and their salts. Examples of salts include hydrochloride salts and sulfate salts.

[0019] (A) Component (A) is preferably at least one selected from the group consisting of Basic Red 51, Basic Yellow 87, HC Blue 16, and Red 227, as it is less likely to cause color changes due to the influence of pH, etc.

[0020] (A) Component can be used alone or in combination of two or more, but since the saturation of dyed hair tends to decrease as the number of types of (A) components combined increases, it is preferable to use two or fewer types.

[0021] [(B) Foaming agent] The hair dye composition contains (B) a foaming agent (hereinafter also referred to as "component (B)") in an amount of 0.1 to 10% by mass relative to 100% by mass of the hair dye composition. However, components corresponding to component (C) below are excluded from component (B).

[0022] (B) Component is not particularly limited as long as it is a known foaming agent. Component (B) is preferably at least one selected from the group consisting of (B1) anionic surfactant, (B2) amphoteric surfactant, and (B3) propellant, and is more preferably at least one selected from the group consisting of (B1) anionic surfactant and (B2) amphoteric surfactant, and even more preferably (B2) amphoteric surfactant, as this makes it easier for the specific gravity of the foam obtained by the foaming method (I) described later to be within a suitable range.

[0023] The content of component (B) in the hair dye composition is 0.1 to 10% by mass, preferably 0.5 to 9% by mass, and more preferably 1 to 8% by mass, based on 100% by mass of the hair dye composition. If the content of component (B) is less than 0.1% by mass, the foaming ability will be insufficient, and if it exceeds 10% by mass, the dyeing ability of component (A), especially the basic dye, will be impaired.

[0024] [(B1) Anionic surfactant] (B1) Anionic surfactants (hereinafter also referred to as "(B1) 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.

[0025] Component (B1) 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. (B1) Component may be used alone or in combination of two or more types.

[0026] [(B2) Amphoteric surfactants] (B2) Amphoteric surfactants (hereinafter also referred to as "(B2) 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, (B2) component 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.

[0027] 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.

[0028] 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.

[0029] 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).

[0030] Examples of amine oxide-type amphoteric surfactants include lauramidopropyl dimethylamine oxide (lauramidopropylamine oxide) and lauramine oxide.

[0031] Component (B2) 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. (B2) Component may be used alone or in combination of two or more types.

[0032] [(B3) Propellant] (B3) The propellant is not particularly limited as long as it is a known component used in hair dye compositions, and the propellant may be in the form of a gas or a liquid. Examples of propellants include liquefied petroleum gas (LPG) with propane, butane, isobutane, etc. as the main components, dimethyl ether (DME), isopentane, nitrogen gas, and carbon dioxide, but liquefied petroleum gas (LPG) is preferred due to its high versatility. (B3) Component may be used alone or in combination of two or more types.

[0033] [(C) component] The hair dye composition contains at least one component selected from the group consisting of (C)(C1) nonionic surfactants, (C2) polyhydric alcohols, and (C3) fatty acids (hereinafter also referred to as "(C) component"). Component (C) is an ingredient for obtaining suitable foam, and since it provides foam that spreads easily throughout the hair during the process of applying the foam to the hair, component (C) is preferably a (C3) fatty acid.

[0034] The hair dye composition preferably contains two or more components selected from the group consisting of (C1) a nonionic surfactant, (C2) a polyhydric alcohol, and (C3) a fatty acid as component (C), and more preferably contains (C1) a nonionic surfactant, (C2) a polyhydric alcohol, and (C3) a fatty acid as component (C). The content of component (C) in the hair dye composition is preferably 1 to 10% by mass, more preferably 2 to 9% by mass, and even more preferably 4.5 to 7.5% by mass of 100% by mass of the hair dye composition, in order to obtain a suitable foam.

[0035] In the hair dye composition, the mass ratio (A) / (C) of (A) is 0.7 or less, preferably 0.4 or less, more preferably 0.3 or less, and most preferably 0.2 or less. When (A) / (C) is within the above range, foam with a suitable specific gravity is easily obtained. The lower limit of the mass ratio (A) / (C) between (A) and (C) is not particularly limited, but is preferably 0.05 or more, more preferably 0.09 or more, and even more preferably 0.1 or more.

[0036] [(C1) Nonionic surfactant] (C1) nonionic surfactants (hereinafter also referred to as "(C1) 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; alkanolamides such as polyoxyethylene cholestanol, polyoxyethylene phytostanol, and cocamide methyl MEA; sugar esters; sugar ethers; sugar amides; saponins; and polyoxyethylene methyl glucoside.

[0037] The (C1) component is preferably at least one selected from the group consisting of alkyl glucoside, polyoxyethylene alkyl ether, and alkanolamide, as it is easy to increase the specific gravity of the foam, more preferably at least one selected from the group consisting of lauryl glucoside, oleth-2, and cocamide methyl MEA, and even more preferably lauryl glucoside. Component (C1) may be used alone or in combination of two or more types.

[0038] The content of component (C1) in the hair dye composition is preferably more than 0% by mass and 3% by mass or less, and more preferably 0.2 to 2% by mass, based on 100% by mass of the hair dye composition. When the content of component (C1) is within the above range, foam with a suitable specific gravity is easily obtained.

[0039] [(C2) Polyhydric alcohol] The (C2) polyhydric alcohol (hereinafter also referred to as "(C2) 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 easily increase the specific gravity of the foam. The (C2) component may be used alone or in combination of two or more types.

[0040] The content of component (C2) in the hair dye composition is preferably more than 0% by mass and 10% by mass or less, more preferably 1 to 9% by mass, and even more preferably 2 to 8% by mass, based on 100% by mass of the hair dye composition. When the content of component (C2) is within the above range, foam with a suitable specific gravity is easily obtained.

[0041] [(C3) fatty acid] (C3) fatty acids (hereinafter also referred to as "(C3) components") are not limited by the number of carbon atoms, and can be saturated, unsaturated, linear, or branched fatty acids. The (C3) component 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. The (C3) component is preferably a fatty acid that is liquid at 25°C, and examples of such fatty acids include oleic acid, linoleic acid, linolenic acid, and isostearic acid.

[0042] Examples of the (C3) component 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 easily and stably incorporated into the formulation.

[0043] Component (C3) 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. The (C3) component may be used alone or in combination of two or more types.

[0044] The content of component (C3) in the hair dye composition is preferably 0.1 to 3% by mass, more preferably 0.3 to 2.5% by mass, based on 100% by mass of the hair dye composition. When the content of component (C3) is within the above range, foam with a suitable specific gravity is easily obtained.

[0045] [(D) Cationic polymers] The aforementioned hair dye composition is preferable to further contain (D) a cationic polymer (hereinafter also referred to as "component (D)") in an amount of 0.05 to 1.5% by mass per 100% by mass of the hair dye composition, as this provides a foam that spreads easily throughout the hair during the process of applying the foam to the hair. Because it provides excellent foam retention and manageability of the hair after dyeing, the content of component (D) is more preferably 0.1 to 1% by mass.

[0046] Component (D) is not particularly limited, and various cationic polymers can be used. Examples of component (D) 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 (D) may be used alone or in combination of two or more types.

[0047] [Optional component] The aforementioned 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 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, and even more preferably 93% by mass or more of water in 100% by mass of the hair dye composition.

[0048] The hair dye composition may optionally contain, in addition to components (A) to (D), 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 (except component (C3)), powders, thickeners, humectants (except component (C2)), herbal medicines, pH adjusters, chelating agents, preservatives, antioxidants, cooling agents, vitamins, proteins, fragrances, antibacterial agents, and pigments (except component (A)).

[0049] [pH] In this specification, pH is the value measured at 25°C using a Horiba F-71 benchtop pH meter. If the hair dye composition (C3) does not contain fatty acids, the pH of the 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.

[0050] When the hair dye composition contains liquid fatty acids as (C3) fatty acids, the pH of the hair dye composition is preferably 7.0 or higher, as it is easier to stably incorporate them into the formulation. When the hair dye composition contains solid fatty acids as (C3) fatty acids, the pH of the 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.

[0051] [Dosage Form] The properties of the hair dye composition are not particularly limited, but examples include liquid (lotion), gel, emulsion, and cream. It may also be in the form of an aerosol foam, pump foam, squeeze foam, or mist when used. A liquid or gel form is preferred, and a liquid form is more preferred, as it makes it easier to apply the agent to the hair. Liquid refers to a viscosity at 25°C of 1 to 800 mPa·s, preferably 1 to 500 mPa·s.

[0052] The hair dye composition may be either a non-emulsified hair dye composition or an emulsified hair dye composition, but is preferably a non-emulsified hair dye composition. A non-emulsified hair dye composition is a hair dye composition that may contain water, oily components, and surfactants, but is not in an emulsified state. The appearance of the hair dye composition may be transparent, translucent, or opaque, for example.

[0053] [Specific gravity of foam] The hair dye composition has a specific gravity of foam obtained by the foaming method (I) described below, preferably 0.04 to 0.2, more preferably 0.065 to 0.2, even more preferably 0.08 to 0.2, and particularly preferably 0.1 to 0.2.

[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] In this specification, the specific gravity of foam (or foamy hair dye composition) is measured by the following method. Method for measuring the specific gravity of foam: Fill a 100mL stainless steel specific gravity cup with foam, measure the weight at 25°C, and determine the weight (W) of the specific gravity cup filled with foam. B (g) is obtained. Weight W of an empty specific gravity cup. E (g) and the weight of the specific gravity cup filled with water W W Measure (g) and calculate the specific gravity using the following formula (1). Specific gravity=(W B -W E ) / (W W -W E )...Equation (1)

[0056] The foaming method (I) is one embodiment of a method for obtaining a first foamy hair dye composition suitable for application to hair by foaming the hair dye composition before applying it to hair.

[0057] If the specific gravity is within the specified range, the foam becomes thick and dense, making it easy to apply a large amount of the hair dye composition to the hair even without advanced beauty techniques, thus making it easier to uniformly and intensely dye the hair. If the specific gravity is too low, the foam becomes thin and fluffy, making it difficult to apply a large amount of the hair dye composition to the hair. If the specific gravity is too high, the foam may collapse after application, reducing its ability to adhere to the hair.

[0058] [Changes in the specific gravity of foam] Preferably, the hair dye composition has a specific gravity of foam obtained by foaming method (II) below that is lower than the specific gravity of foam obtained by foaming method (I). More preferably, with specific gravity a of foam obtained by foaming method (I) and specific gravity b of foam obtained by foaming method (II), the specific gravity reduction rate calculated from the following formula (2) is 10 or more, more preferably 20 or more, even more preferably 50 or more, and particularly preferably 60 or more.

[0059] Specific gravity reduction rate=(1-b / a)×100...Equation (2) 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 foaming method (II) is one embodiment of a method for obtaining a second foamy hair dye composition in which the first foamy hair dye composition applied to the hair is further foamed by hand on the hair to reduce the specific gravity of the foam of the hair dye composition, increase the foam volume, and obtain a second foamy hair dye composition in which the amount of foam and foam elasticity can easily spread throughout the hair.

[0061] A specific gravity reduction rate of 50 or more indicates that the foam obtained by foaming method (II) has more than twice the volume of the foam obtained by foaming method (I). When the specific gravity reduction rate is within the aforementioned range, the specific gravity of the foam decreases sufficiently during the process of massaging it into the hair, increasing the foam volume. This makes it easier for the foam obtained by foaming method (II) to spread throughout the entire scalp in terms of foam volume and foam elasticity, thus making it easier to achieve both uniform and deep coloring.

[0062] [Manufacturing method] The hair dye composition described above 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.

[0063] [How to use] The method of use of the hair dye composition is not particularly limited; for example, it can be used by applying, spraying, or casting it onto the hair, or by immersing the hair in the hair dye composition.

[0064] The hair dye composition can be used on both dry and wet hair, but it is preferably applied to wet hair. The hair dye composition can be used on both normal and damaged hair. When used on normal hair, the hair dye composition is likely to exhibit even coloring properties. When used on damaged hair, especially hair damaged by bleaching, the hair dye composition is likely to exhibit deep coloring properties, and this is especially true when component (A) is a basic dye. In order to ensure even coloring properties even on damaged hair, the hair dye composition is preferably used on damaged hair after dyeing, and more preferably on damaged hair after dyeing with an alkaline color. The aforementioned hair dye composition can be used on both undyed virgin hair and dyed hair.

[0065] The hair dye composition is preferably a hair dye composition that is applied to hair in a foamy state. Since the aforementioned hair dye composition can achieve both uniform coloring and deep coloring without requiring advanced beauty techniques, it is preferable to foam it up to form a first foamy hair dye composition suitable for application to hair, and then apply it to the hair. Since the hair dye composition can achieve both uniform coloring and deep coloring 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.

[0066] The aforementioned hair dye composition may be used individually, or multiple hair dye compositions containing different dyes may be mixed at the time of use to create any desired color. This allows for the expression of a wide range of shades.

[0067] The aforementioned hair dye composition may be used immediately after the hair dye. This allows for color correction after the hair coloring treatment.

[0068] [Hair dyeing method (α)] The hair dyeing method of the present invention includes the steps of: foaming the 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 on 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).

[0069] [Process (α1)] Step (α1) is a step of foaming the 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 hair dye composition is not particularly limited, but preferably it is a method of placing the hair dye composition in a container with a lid and shaking it up and down, more preferably it is a method of placing the 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 it is the foaming method (I) described above.

[0070] The degree to which the hair dye composition is foamed is not particularly limited, but preferably the specific gravity of the first foamy hair dye composition is 0.04 to 0.2, more preferably 0.065 to 0.2, even more preferably 0.08 to 0.2, and particularly preferably 0.1 to 0.2.

[0071] When the specific gravity is within the specified range, the foam becomes thick and dense, making it easy to apply a large amount of the hair dye composition to the hair even without advanced beauty techniques, thus making it easier to uniformly and intensely dye the hair. If the specific gravity is too low, the foam becomes thin and fluffy, making it difficult to apply a large amount of the hair dye composition to the hair.

[0072] [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.

[0073] The hair to which the first foamy hair dye composition is applied may be dry or wet, but from the viewpoint of enhancing the hair dyeing effect, it is preferable that it be wet. The hair to which the first foamy hair dye composition is applied may be normal hair or damaged hair. When the hair to which the first foamy hair dye composition is applied is normal hair, the uniform coloring properties of the hair dye composition are easily exhibited. Furthermore, when the hair is damaged hair, especially hair damaged by bleaching, the deep coloring properties of the hair dye composition are easily exhibited, and this deep coloring properties are particularly easily exhibited when component (A) is a basic dye. In order to easily exhibit uniform coloring even on damaged hair, the hair dye composition is preferably used on damaged hair after dyeing, more preferably on damaged hair after dyeing with alkaline color. The hair to which the first foamy hair dye composition is applied may be undyed virgin hair or dyed hair.

[0074] [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 hair dye composition, increasing the foam volume. This makes it easier for the foam volume and foam elasticity to spread throughout the hair, thus making it easier to achieve both uniform coloring and deep coloring.

[0075] 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 above to a human head.

[0076] The degree to which the first foamy hair dye composition is foamed is not particularly limited, but preferably to the 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, and more preferably to the extent that the specific gravity reduction rate calculated from the following formula (3), where the specific gravity of the first foamy hair dye composition is specific gravity c and the specific gravity of the second foamy hair dye composition is specific gravity d, is 10 or more, more preferably 20 or more, even more preferably 50 or more, and particularly preferably 60 or more. Specific gravity reduction rate=(1-d / c)×100...Equation (3)

[0077] A specific gravity reduction rate of 50 or more indicates that the second foamy hair dye composition has more than twice the volume of foam compared to the first foamy hair dye composition. If the specific gravity reduction rate is within the above range, in step (α3), the specific gravity of the foam decreases sufficiently and the foam volume increases. From the standpoint of foam volume and foam elasticity, the second foamy hair dye composition spreads more easily throughout the hair, making it easier to achieve both uniform dyeing and deep dyeing.

[0078] [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.

[0079] 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. [Examples]

[0080] The present invention will now be described in more detail with reference to examples, but the present invention is not limited thereto.

[0081] <Examples 1-37, Comparative Examples 1-3> Using the commercially available products listed in Table 1, hair dye compositions were prepared by mixing each component 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 37 and Comparative Examples 1 to 3 represent the mass percentage of each component when the hair dye composition is considered to be 100% by mass, and the values ​​are shown in terms of pure content.

[0082] In Example 18, where liquefied petroleum gas (LPG) was used as component (B), the components other than LPG were mixed and then placed in an aerosol container, and LPG was filled to an initial internal pressure of 0.29 MPa to obtain the hair dye composition.

[0083] [Table 1]

[0084] <1. Method for evaluating foaming properties> 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. Immediately after shaking, the lid of the shaker container was opened and the bubbles formed inside the container were evaluated according to the following criteria. 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.

[0085] ◎: Dense foam is formed at the bottom of the container, as shown in Figure 1. ○: The foam is slightly dense and has expanded to about half the volume of the container. △: As shown in Fig. 2, fluffy bubbles are swelling up to the upper part of the container. ×: Almost no bubbles are formed.

[0086] The bubbles evaluated as ◎ or 〇 have a thick texture and it is easy to apply a large amount of the sample to the hair even without advanced beauty technology. On the other hand, the bubbles evaluated as △ have a fluffy texture and it is difficult to apply a large amount to the hair. In the case of the × evaluation, since the bubbles are not formed, it is difficult to apply to the hair.

[0087] <2. Evaluation method for the specific gravity of the bubbles (1)> Immediately after shaking 30 times by the "1. Evaluation method for foaming property", the bubbles (hereinafter also referred to as "bubbles (1)") were taken into a pycnometer cup (Erichsen paint measuring instrument Model 290, capacity 100 mL, made of stainless steel), and the weight was measured at 25 °C. The weight W B (g) of the pycnometer cup filled with bubbles was obtained. The weight W E (g) of the empty pycnometer cup and the weight W W (g) of the pycnometer cup filled with water were measured at 25 °C, and the specific gravity was calculated from the following formula (1). Specific gravity = (W B - W E ) / (W W - W E ) ··· Formula (1)

[0088] The obtained specific gravity was classified according to the following criteria to evaluate the specific gravity of the bubbles (1). ◎◎: 0.08 or more ◎: 0.065 or more and less than 0.08 〇: 0.04 or more and less than 0.065 ×: Less than 0.04

[0089] Regarding Example 18 using liquefied petroleum gas (LPG) as the component (B), without shaking in the shaker container, the bubbles immediately after discharging from the aerosol container were taken as the bubbles (1).

[0090] <3. Evaluation method for the change of the bubbles> The entire amount of foam (Foam (1)) immediately after shaking 30 times as described in "1. Method for Evaluating Foaming Properties" was applied to half of a wig (Tokyo Charm No. 5, manufactured by Mitsuya Co., Ltd.), massaged in for 1 minute, and the foam (hereinafter also referred to as Foam (2)) was collected in a pycnometer cup (Erichsen Paint Measuring Instrument Model 290, 100 mL capacity, stainless steel) and its specific gravity was calculated as described above. Let the specific gravity of foam (1) be specific gravity a and the specific gravity of foam (2) be specific gravity b. The specific gravity reduction rate was calculated using the following equation (2). Specific gravity reduction rate=(1-b / a)×100...Equation (2)

[0091] The obtained specific gravity reduction rates were classified according to the following criteria and used to evaluate the changes in foam. ◎: 60 or more 〇: 20 to less than 60 △: 10 or more but less than 20 ×: Less than 10

[0092] A specific gravity reduction rate of 50 or more indicates that the volume of bubble (2) is more than twice that of bubble (1). The specific gravity reduction rate is an indicator of the decrease in the specific gravity of the foam and the increase in foam volume during the process of applying the foam to the hair. By measuring the specific gravity reduction rate, it is possible to evaluate whether the foam quality (foam volume and foam elasticity) has changed to one that can easily spread throughout the entire scalp. A rating of ◎ or ○ indicates that the foam quality (foam volume and foam elasticity) has sufficiently changed to one that can easily spread throughout the hair, while a rating of △ or × indicates that the change to a foam quality that can easily spread throughout the hair is insufficient.

[0093] <4. Method for evaluating the persistence of foam> Ten expert panelists (hairdressers) each applied foam (Foam (1)) that had been shaken 30 times according to "1. Evaluation Method for Foaming Properties" to half of a wig (Tokyo Charm No. 5, manufactured by Mitsuya Co., Ltd.), and after 5 minutes, evaluated the persistence of the foam (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.

[0094] 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.

[0095] <5. Method for evaluating staining intensity> The foam (Foam (1)) immediately after shaking 30 times as described in "1. Evaluation Method for Foaming Properties" was applied to a bundle of goat hair (manufactured by Beaulux Co., Ltd.) by multiplying the specific gravity of Foam (1) of each sample by 10 g (e.g., when the specific gravity of Foam (1) of the sample is 0.12, the amount applied is 1.2 g). After standing for 5 minutes, the bundles were rinsed with water at approximately 40°C, towel-dried, and then dried with a hairdryer. The color of the dyed bundles was evaluated for dyeing intensity according to the following criteria. ◎◎: It is visible to the naked eye that the goat hair is dyed very well. ◎: It is visually apparent that the goat hair is well dyed. ○: It is visually apparent that the goat hair is slightly dyed. ×: It is visible that the goat hair is not very well dyed.

[0096] <6. Method for evaluating uniformity of staining> Ten expert panelists (hairdressers) each evaluated the uniformity of the dyed goat hair bundles according to the following criteria, specifically "5. Evaluation Method for Dye Intensity". 4 points: The dyeing is even and consistent. 3 points: Almost no unevenness is noticeable. Points 2: When comparing individual strands of goat hair, there is a noticeable unevenness. 1 point: There is a noticeable unevenness throughout the hair strands.

[0097] ◎◎: 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.

[0098] <7. Method for evaluating texture (cohesion, smoothness)> Ten professional panelists (hairdressers) each applied 1.0g of foam (Foam (1)) immediately after shaking it 30 times according to "1. Evaluation Method for Foaming Properties" 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.

[0099] 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.

[0100] 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.

[0101] [Table 2]

[0102] [Table 3]

[0103] [Table 4]

[0104] [Table 5]

[0105] [Table 6]

[0106] The hair dye compositions prepared in Examples 1-37 yielded favorable results in all evaluation items. The hair dye composition of the present invention does not require advanced beauty techniques and achieves both uniform coloring and deep coloring.

[0107] The hair dye composition prepared in Comparative Example 1 did not foam sufficiently because the amount of (B) foaming agent contained in the hair dye composition was less than the specified amount, making it difficult to apply to hair. Therefore, it was not possible to evaluate anything other than foaming properties.

[0108] The hair dye composition produced in Comparative Example 2 had problems in terms of foaming ability, specific gravity of foam (1), and foam variation, as the amount of foaming agent (B) contained in the hair dye composition was greater than the specified amount, resulting in the formation of a fluffy, dilute foam. There were also problems with uniform dyeing.

[0109] The hair dye composition produced in Comparative Example 3 had a ratio of (A) / (C) greater than 0.7, resulting in the formation of a fluffy, dilute foam. This presented problems in terms of foaming ability, the specific gravity of foam (1), and foam changes, as well as problems with uniform dyeing and intense dyeing.

Claims

1. (A) At least one dye selected from the group consisting of basic dyes, HC dyes, acid dyes, and nitro dyes, (B) Foaming agent 0.1 to 10% by mass (excluding components that fall under (C) below), and (C) At least one component selected from the group consisting of (C1) nonionic surfactants, (C2) polyhydric alcohols, and (C3) fatty acids. A hair dye composition comprising (A) and (C), wherein the mass ratio (A) / (C) of (A) is 0.7 or less.

2. The hair dye composition according to claim 1, wherein the (B) foaming agent is at least one selected from the group consisting of (B1) anionic surfactant, (B2) amphoteric surfactant, and (B3) propellant.

3. The hair dye composition according to claim 1 or 2, comprising a (C3) fatty acid as the (C) component.

4. The hair dye composition according to claim 3, wherein the (C3) fatty acid is a higher fatty acid having 10 or more carbon atoms.

5. The hair dye composition according to claim 1 or 2, wherein the content of component (A) is 0.01 to 2% by mass.

6. The hair dye composition according to claim 1 or 2, further comprising (D) 0.05 to 1.5% by mass of a cationic polymer.

7. The hair dye composition according to claim 6, wherein the (D) cationic polymer is at least one selected from the group consisting of polyquaternium-6 and guar hydroxypropyltrimonium chloride.

8. The hair dye composition according to claim 1 or 2, wherein the specific gravity of the foam obtained by the foaming method (I) described below is 0.04 to 0.

2. 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.

9. The hair dye composition according to claim 1 or 2, wherein the hair dye composition is a hair dye composition for application to hair in a foamy state.

10. A step (α1) of foaming the 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.

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