Oxidative hair dye, third agent, oxidative hair dye kit, and hair dyeing method

Abstract

Provided are an oxidation hair dye that suppresses loss of saturation, a third agent in the oxidation hair dye, an oxidation hair dye kit that suppresses loss of saturation, and a hair dyeing method that suppresses loss of saturation. [Solution] An oxidative hair dye comprising a first agent containing one or more selected from (A) paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof, and (B) one or more selected from resorcinol and 2,4-diaminophenoxyethanol or salts thereof; a second agent containing an oxidizing agent; and a third agent containing one or more selected from (C) 1-naphthol and (D) 2,6-diaminopyridine. The third agent in the oxidative hair dye. An oxidative hair dye kit for the oxidative hair dye. A hair dyeing method using the oxidative hair dye or the oxidative hair dye kit.

Description

[Technical Field]

[0001] The present invention relates to an oxidation hair dye, a third agent, an oxidation hair dye kit, and a hair dyeing method. [Background technology]

[0002] Oxidative hair dyes used to color hair work by dyeing the hair with an oxidative dye that has been permeated into the hair through oxidative polymerization, and achieve longer-lasting color retention in hair compared to other hair coloring agents such as acidic hair dyes.

[0003] As an example of an oxidation hair dye, a hair dye composition characterized by blending one or more oxidation dye components (A) selected from the group consisting of paraphenylenediamine, toluene-2,5-diamine sulfate, toluene-2,5-diamine hydrochloride, and toluene-2,5-diamine with an oxidation dye component (B) other than the oxidation dye component (A) in a weight ratio of (A):(B) in the range of 1:2 to 1:10 has been disclosed (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-99512 Summary of the Invention [Problem to be solved by the invention]

[0005] Oxidative hair dyes are often used on the entire hair as two-component oxidative hair dyes (e.g., Patent Document 1), in which a first component containing an oxidative dye and a second component containing an oxidizing agent are mixed before use. Such two-component oxidative hair dyes are usually used to dye the entire hair in the same hue.

[0006] On the other hand, as an oxidation hair dye, a three-component or more oxidation hair dye may be used in which, in addition to the first and second components used in a two-component oxidation hair dye, one or more additional components (for example, a third component) are mixed before use. This three-component or more oxidation hair dye can change the hue (hue, saturation, brightness, etc.) of hair dyed with a two-component oxidation hair dye in which the first and second components are mixed before use to a variety of different hues by using, for example, another component containing an oxidation dye different from the oxidation dye contained in the first component.

[0007] There is also a need to dye hair in various hues in parts of the hair, thereby achieving various hues throughout the hair. To meet such needs, a two-component oxidative hair dye and a three-component or more oxidative hair dye are used in combination, with one part of the hair dyed with the two-component oxidative hair dye and the other part of the hair dyed with the three-component or more oxidative hair dye. For example, hair with no history of oxidative dyeing (e.g., hair at the roots that has not been subjected to oxidative dyeing) is dyed to a desired hue using a two-component oxidative hair dye, while hair with a history of oxidative dyeing (e.g., a portion of hair approximately 15 cm from the ends to the middle) is dyed with a three-component or more oxidative hair dye to a hue different from that used with the two-component oxidative hair dye, thereby achieving various hues throughout the hair.

[0008] However, with three- or more-component oxidative hair dyes, the saturation of the dyed hair may decrease depending on the combination of the components used (first, second, third, etc.). Furthermore, when hair with a history of oxidative dyeing is dyed with an oxidative hair dye, the saturation of the dyed hair tends to decrease. However, when the above hair is dyed with a three- or more-component oxidative hair dye, this tendency becomes more pronounced, and the saturation of the dyed hair may decrease even more. These cases can occur when a three- or more-component oxidative hair dye is used in combination with a two-component oxidative hair dye.

[0009] Due to the above circumstances, there is a demand for a three-component or more oxidative hair dye that is a mixture of at least a first component containing an oxidative dye, a second component containing an oxidizing agent, and a third component containing an oxidative dye different from the oxidative dye contained in the first component, thereby achieving hair dyeing that suppresses the loss of saturation.

[0010] The present invention aims to provide an oxidative hair dye that suppresses loss of saturation, a third agent in the oxidative hair dye, an oxidative hair dye kit that suppresses loss of saturation, and a hair dyeing method that suppresses loss of saturation. [Means for solving the problem]

[0011] The present inventors have conducted extensive research based on the above-mentioned objectives and have found that, in an oxidation hair dye that is used by mixing at least a first agent, a second agent, and a third agent, if the first agent contains one or more selected from (A) paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof, and (B) one or more selected from resorcinol and 2,4-diaminophenoxyethanol or salts thereof, the second agent contains an oxidizing agent, and the third agent contains one or more selected from (C) 1-naphthol and (D) 2,6-diaminopyridine, then loss of saturation can be suppressed in hair dyeing using the oxidation hair dye.

[0012] Furthermore, the present inventors have discovered that in an oxidation hair dye composition that is a mixture of at least a first agent containing an oxidation dye, a second agent containing an oxidizing agent, and a third agent containing an oxidation dye different from the oxidation dye contained in the first agent, the saturation value C*(I) of hair dyed with a mixture (I) obtained by mixing the first agent and the second agent in a ratio of 1:1 (by mass) is measured with a spectrophotometer (measurement mode: SCE measurement), and the saturation value C*(I) of the hair dyed with the mixture (I) is determined as follows: It has been discovered that an oxidative hair dye in which hair dyed with a mixture (II) obtained by mixing the first agent, the second agent, and the third agent in a ratio of first agent:second agent:third agent = 0.8:1:0.2 (mass ratio) is measured with a spectrophotometer (measurement mode: SCE measurement) to obtain a saturation value C*(II), and the ΔC* value calculated from the formula ΔC*=C*(II)-C*(I) is 0 or greater, can suppress a decrease in saturation when dyeing hair using the oxidative hair dye.

[0013] Based on the above findings, the present inventors have completed the present invention.

[0014] The present invention includes the following inventions [1] to

[13] .

[0015] The oxidation hair dye of [1] is an oxidation hair dye that is used by mixing a first agent, a second agent, and a third agent, The first agent is a blend of (A) one or more selected from paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof, and (B) one or more selected from resorcinol, and 2,4-diaminophenoxyethanol or salts thereof, The second agent contains an oxidizing agent, The third agent contains one or more selected from (C) 1-naphthol and (D) 2,6-diaminopyridine.

[0016] The oxidation hair dye of [2] is the oxidation hair dye of [1], and the third agent is a blend of (C) 1-naphthol and (D) 2,6-diaminopyridine.

[0017] The oxidation hair dye of [3] is the oxidation hair dye of [1] or [2], wherein the mass ratio of the blended amount of (C) 1-naphthol to the blended amount of (D) 2,6-diaminopyridine in the third agent is 0.5 or more.

[0018] The oxidation hair dye [4] is any one of the oxidation hair dyes selected from [1] to [3], wherein the mass ratio ((A) / (B)) of the total amount of the (A) paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof, in a non-salt form to the total amount of the (B) resorcinol, and one or more selected from 2,4-diaminophenoxyethanol or salts thereof, in a non-salt form, is less than 5.88.

[0019] The oxidation hair dye [5] is any oxidation hair dye selected from [1] to [4], and does not contain para-aminophenol or a salt thereof, or the content of para-aminophenol or a salt thereof is 0.2 mass% or less.

[0020] The oxidation hair dye [6] is any oxidation hair dye selected from [1] to [5], and does not contain 5-aminoorthocresol or a salt thereof, or the content of 5-aminoorthocresol or a salt thereof is 0.25 mass% or less.

[0021] The third agent in [7] is a third agent in an oxidation hair dye that is used by mixing a first agent, a second agent, and a third agent, The first agent is a blend of (A) one or more selected from paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof, and (B) one or more selected from resorcinol, and 2,4-diaminophenoxyethanol or salts thereof, The second agent contains an oxidizing agent, The third agent contains one or more selected from (C) 1-naphthol and (D) 2,6-diaminopyridine.

[0022] The oxidation hair dye kit [8] is an oxidation hair dye kit including a first agent, a second agent, and a third agent, The first agent is a blend of (A) one or more selected from paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof, and (B) one or more selected from resorcinol, and 2,4-diaminophenoxyethanol or salts thereof, The second agent contains an oxidizing agent, The third agent contains one or more selected from (C) 1-naphthol and (D) 2,6-diaminopyridine.

[0023] [9] The oxidation hair dye is an oxidation hair dye that is used by mixing a first agent containing an oxidation dye, a second agent containing an oxidizing agent, and a third agent containing an oxidation dye different from the oxidation dye contained in the first agent, The saturation value C*(I) of hair dyed with a mixed agent (I) obtained by mixing the first agent and the second agent in a ratio of first agent:second agent = 1:1 (by mass) is taken as the saturation value when measured with a spectrophotometer (measurement mode: SCE measurement) and the saturation value C*(II) of hair dyed with a mixed agent (II) obtained by mixing the first agent, the second agent, and the third agent in a ratio of first agent:second agent:third agent = 0.8:1:0.2 (by mass) is taken as the saturation value when measured with a spectrophotometer (measurement mode: SCE measurement). The value of ΔC* calculated from the formula ΔC* = C*(II) - C*(I) is 0 or greater.

[0024] The oxidation hair dye of

[10] is the oxidation hair dye of [9], hair dyed with a mixed agent (I) obtained by mixing the first agent and the second agent in a first agent:second agent = 1:1 (mass ratio), the hue angle measured with a spectrophotometer (measurement mode: SCE measurement) is defined as h(I); The hue angle of hair dyed with a mixed agent (II) obtained by mixing the first agent, the second agent, and the third agent in a mass ratio of the first agent:the second agent:the third agent = 0.8:1:0.2 is measured with a spectrophotometer (measurement mode: SCE measurement), and is defined as h(II); The value of the difference in hue angle (hα) obtained from the following formulas (2) and (3) is 0 or more and 40 or less. α = |h(I)-h(II)| (2) Hue angle difference (hα) = |α-(360×N)| (3) (In the above formula (3), the value of α calculated by formula (2) is N=0 when α≦180, and N=1 when α>180.)

[0025] The oxidation hair dye of

[11] is the oxidation hair dye of [8] or [9], The first agent contains, as oxidation dyes, at least: (A) one or more selected from paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof; and (B) one or more selected from resorcinol, and 2,4-diaminophenoxyethanol or salts thereof; The third agent contains at least one or more oxidative dyes selected from (C) 1-naphthol and 2,6-diaminopyridine.

[0026] The hair dyeing method of

[12] is a hair dyeing method using any one of the oxidative hair dyes selected from the oxidative hair dyes of [1] to [6].

[0027] The hair dyeing method of

[12] is a hair dyeing method using any one of the oxidative hair dyes selected from the oxidative hair dyes of [8] to

[11] . [Effects of the Invention]

[0028] According to the oxidation hair dye of the present invention, an oxidation hair dye in which the decrease in saturation is suppressed can be provided. According to the third agent of the present invention, it is possible to provide a third agent in an oxidation hair dye that suppresses the decrease in saturation. According to the oxidation hair dye kit of the present invention, an oxidation hair dye kit in which the decrease in saturation is suppressed can be provided. According to the hair dyeing method of the present invention, a hair dyeing method using an oxidation hair dye agent that suppresses a decrease in saturation can be provided. DETAILED DESCRIPTION OF THE INVENTION

[0029] The present invention will be described below based on embodiments of the present invention (hereinafter referred to as the present embodiments). The oxidative hair dye of the present embodiments will be described separately as an oxidative hair dye of a first embodiment and an oxidative hair dye of a second embodiment. The hair dyeing method of the present embodiments will be described separately as a hair dyeing method of a first embodiment and a hair dyeing method of a second embodiment.

[0030] <Oxidative hair dye of the first embodiment> The oxidation hair dye of the first embodiment is an oxidation hair dye obtained by mixing at least a first agent, a second agent, and a third agent, and the first agent contains (A) one or more selected from paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof, and (B) resorcinol, and 2,4-diaminophenoxyethanol or a salt thereof, The second agent contains an oxidizing agent, The third agent is a blend of (C) 1-naphthol and (D) 2,6-diaminopyridine.

[0031] The oxidation hair dye of the first embodiment is an oxidation hair dye obtained by mixing at least a first agent, a second agent, and a third agent, and may be an oxidation hair dye obtained by mixing the first agent, the second agent, and the third agent in an appropriate mixing ratio, or may be an oxidation hair dye obtained by mixing the first agent, the second agent, the third agent, and one or more other agents in an appropriate mixing ratio. The other agents may be blends of various components used in hair compositions.

[0032] The oxidation hair dye of the first embodiment may be a three-component oxidation hair dye, or may be a four-component or more-component oxidation hair dye (for example, a four-component, five-component, etc.).

[0033] In the following description, "paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and their salts" may be referred to as component (A), "resorcinol, and 2,4-diaminophenoxyethanol or its salts" as component (B), "1-naphthol" as component (C), and "2,6-diaminopyridine" as component (D).

[0034] (First agent of the first embodiment) The first agent of the oxidation hair dye of the first embodiment (hereinafter referred to as "the first agent of the first embodiment") contains a blend of (A) one or more selected from paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof, and (B) one or more selected from resorcinol, and 2,4-diaminophenoxyethanol or salts thereof.

[0035] (Component (A): paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof) The first agent of the first embodiment is a blend of one or more selected from paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof.

[0036] Examples of salts of toluene-2,5-diamine that can be incorporated into the first agent of the first embodiment include toluene-2,5-diamine hydrochloride, toluene-2,5-diamine sulfate, etc. Examples of salts of 2,2'-[(4-aminophenyl)imino]bisethanol include 2,2'-[(4-aminophenyl)imino]bisethanol sulfate, etc.

[0037] The first agent of the first embodiment preferably contains paraphenylenediamine or a salt thereof as the component (A) from the viewpoint of being more effective in suppressing the decrease in saturation.

[0038] In the first agent of the first embodiment, the range of the blending amount of component (A) is, for example, 0.01% by mass or more and 2% by mass or less, calculated as the total amount of each of the blending amounts of paraphenylenediamine, toluene-2,5-diamine, and 2,2'-[(4-aminophenyl)imino]bisethanol in the first agent, and the blending amounts of the salt of paraphenylenediamine, the salt of toluene-2,5-diamine, and the salt of 2,2'-[(4-aminophenyl)imino]bisethanol, converted into paraphenylenediamine, toluene-2,5-diamine, and 2,2'-[(4-aminophenyl)imino]bisethanol, respectively (hereinafter, this total amount is referred to as the "total amount of (A) in the first agent").

[0039] As an example of calculating the total amount of (A) in the first agent, if the first agent of the first embodiment contains 0.1 mass% paraphenylenediamine and 0.15 mass% 2,2'-[(4-aminophenyl)imino]bisethanol sulfate as the (A) components, the total amount of (A) in the first agent will be 0.2 mass% (= 0.1 mass% (amount of paraphenylenediamine) + (0.15 mass% (amount of 2,2'-[(4-aminophenyl)imino]bisethanol sulfate) × (196.25 (molecular weight of 2,2'-[(4-aminophenyl)imino]bisethanol) / 294.32 (molecular weight of 2,2'-[(4-aminophenyl)imino]bisethanol sulfate))).

[0040] In order to better suppress the decrease in saturation, the amount of component (A) blended into the first agent of the first embodiment is preferably 0.1 mass % or more, more preferably 0.2 mass % or more, and even more preferably 0.4 mass % or more, as the total amount of component (A) in the first agent.

[0041] In order to better suppress the decrease in saturation, the amount of component (A) blended into the first agent in the first embodiment is preferably 1.5 mass % or less, more preferably 1.0 mass % or less, and even more preferably 0.8 mass % or less, as the total amount of component (A) in the first agent.

[0042] From the above-mentioned viewpoints, the range of the amount of component (A) to be blended in the first agent in the first embodiment is preferably 0.1 mass% or more and 1.5 mass% or less, more preferably 0.2 mass% or more and 1.0 mass% or less, and even more preferably 0.4 mass% or more and 0.8 mass% or less, as the total amount of (A) in the first agent.

[0043] (Component (B): resorcinol, and 2,4-diaminophenoxyethanol or its salt) The first agent of the first embodiment is a blend of one or more selected from resorcinol, and 2,4-diaminophenoxyethanol or a salt thereof.

[0044] An example of the salt of 2,4-diaminophenoxyethanol contained in the first agent of the first embodiment is 2,4-diaminophenoxyethanol hydrochloride.

[0045] The first agent of the first embodiment preferably contains, as the component (B), resorcinol and 2,4-diaminophenoxyethanol or a salt thereof, from the viewpoint of being more effective in suppressing a decrease in saturation.

[0046] The range of the blending amount of the (B) component in the first agent of the first embodiment is, for example, 0.01 mass % or more and 2 mass % or less, as the total amount of each blending amount of resorcinol and 2,4-diaminophenoxyethanol in the first agent and the blending amount of a salt of 2,4-diaminophenoxyethanol converted to 2,4-diaminophenoxyethanol (hereinafter, this total amount will be referred to as the "total amount of (B) in the first agent").

[0047] As an example of calculating the total amount of (B) in the first agent, if 0.287% by mass of 2,4-diaminophenoxyethanol hydrochloride is blended as the (B) component in the first agent of the first embodiment, the total amount of (B) in the first agent will be 0.2% by mass (= 0.287% by mass (amount of 2,4-diaminophenoxyethanol hydrochloride blended) × (168.19 (molecular weight of 2,4-diaminophenoxyethanol) / 241.11 (molecular weight of 2,4-diaminophenoxyethanol hydrochloride)).

[0048] In order to better suppress the decrease in saturation, the amount of the (B) component blended into the first agent in the first embodiment is preferably 0.05 mass % or more, more preferably 0.1 mass % or more, and even more preferably 0.2 mass % or more, as the total amount of (B) in the first agent.

[0049] In order to better suppress the decrease in saturation, the amount of the (B) component blended into the first agent in the first embodiment is preferably 0.6 mass % or less, more preferably 0.5 mass % or less, and even more preferably 0.4 mass % or less, as the total amount of (B) in the first agent.

[0050] From the above-mentioned viewpoints, the range of the amount of the (B) component to be blended in the first agent of the first embodiment is preferably 0.05 mass% or more and 0.6 mass% or less, more preferably 0.1 mass% or more and 0.5 mass% or less, and even more preferably 0.2 mass% or more and 0.4 mass% or less, as the total amount of (B) in the first agent.

[0051] (Optional ingredient of the first agent) The first agent of the first embodiment may contain an appropriate blend of other components (hereinafter referred to as "optional components of the first agent") in addition to the above-mentioned components (A) and (B). The optional components of the first agent may be appropriately selected from known components used in oxidation hair dyes, and examples thereof include water, alkaline agents, nonionic surfactants, cationic surfactants, anionic surfactants, higher alcohols, polyhydric alcohols, lower alcohols, hydrocarbons, fats and oils, ester oils, silicones, antioxidants, chelating agents, and oxidation dyes other than components (A) and (B).

[0052] (Alkaline agent) From the viewpoint of improving hair dyeability, the first agent of the first embodiment preferably contains one or more alkaline agents. The alkaline agents improve hair dyeability by swelling the hair when the oxidative hair dye of the first embodiment is used for hair dyeing, thereby increasing the penetration of the oxidative dye (component (A), component (B), etc.) into the hair.

[0053] Examples of alkaline agents that can be incorporated into the first agent of the first embodiment include aqueous ammonia, alkanolamines (monoethanolamine, triethanolamine, isopropanolamine, etc.), metal hydroxides (sodium hydroxide, potassium hydroxide, etc.), metal carbonates (sodium carbonate, potassium carbonate, etc.), metal phosphates (e.g., sodium phosphate, etc.), and ammonium salts (ammonium carbonate, ammonium bicarbonate, ammonium sulfate, etc.).

[0054] The amount of alkaline agent blended into the first agent of the first embodiment is, for example, 0.1% by mass or more, but from the viewpoint of being able to dye hair more darkly, it is preferably 0.5% by mass or more, more preferably 0.8% by mass or more, and even more preferably 1% by mass or more.

[0055] The amount of alkaline agent blended into the first agent of the first embodiment is, for example, 20% by mass or less, but from the viewpoint of reducing the risk of hair damage, it is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less.

[0056] The range of the amount of alkaline agent to be blended in the first agent of the first embodiment is, for example, 0.1% by mass or more and 20% by mass or less, but from the above-mentioned viewpoint, 0.5% by mass or more and 10% by mass or less is preferable, 0.8% by mass or more and 5% by mass or less is more preferable, and 1% by mass or more and 3% by mass or less is even more preferable.

[0057] The first agent of the first embodiment may contain an oxidation dye other than components (A) and (B). Examples of oxidation dyes other than components (A) and (B) include dye intermediates such as phenylenediamine derivatives such as nitroparaphenylenediamine hydrochloride and nitroparaphenylenediamine; and phenol derivatives such as paraaminophenol, 2,4-diaminophenol hydrochloride, orthoaminophenol sulfate, and orthoaminophenol. Examples of oxidation dyes other than components (A) and (B) include couplers such as phenylenediamine derivatives such as metaphenylenediamine hydrochloride and metaphenylenediamine; and aminophenol derivatives such as 5-aminoorthocresol sulfate, 5-aminoorthocresol, and metaaminophenol.

[0058] The first agent of the first embodiment may be, for example, a blend of one or more higher alcohols having 12 to 24 carbon atoms. The blending amount of the higher alcohol having 12 to 24 carbon atoms in the first agent of the first embodiment is, for example, 2 to 10% by mass.

[0059] The first agent of the first embodiment may contain, for example, one or more nonionic surfactants. The amount of nonionic surfactant contained in the first agent of the first embodiment is, for example, 0.5% by mass or more and 5% by mass or less.

[0060] The first agent of the first embodiment may contain, for example, one or more anionic surfactants. The amount of anionic surfactant contained in the first agent of the first embodiment is, for example, 0.5% by mass or more and 5% by mass or less.

[0061] The first agent of the first embodiment may contain, for example, one or more cationic surfactants. The amount of cationic surfactant contained in the first agent of the first embodiment is, for example, 0.5% by mass or more and 3% by mass or less.

[0062] The first agent of the first embodiment may contain, for example, one or more polyhydric alcohols. The amount of polyhydric alcohol contained in the first agent of the first embodiment is, for example, 0.01% by mass or more and 10% by mass or less.

[0063] The first agent of the first embodiment may contain water. The amount of water contained in the first agent of the first embodiment is, for example, 30% by mass or more and 70% by mass or less.

[0064] (viscosity) The viscosity of the first agent in the first embodiment is set as appropriate, but is, for example, 1,000 mPa·s or more and 50,000 mPa·s or less. Here, the viscosity of the first agent in the first embodiment is the value measured after 60 seconds at 25°C using a Brookfield viscometer with a rotor selected according to the viscosity. The rotor rotation speed during measurement is, for example, 12 rpm.

[0065] (pH) The pH of the first agent in the first embodiment is preferably 8.0 or more and 13.0 or less, and more preferably 8.5 or more and 11.0 or less, from the viewpoint of allowing the oxidative dye to penetrate the hair more deeply and achieving a darker color. The pH is measured at 25°C using a known pH meter.

[0066] (alkalinity) The alkalinity of the first agent in the first embodiment is, for example, 0.5 or more and 20.0 or less. Here, "alkalinity" refers to the volume of 0.1 mol / L hydrochloric acid required to neutralize 1 g of the oxidation hair dye (unit of alkalinity: ml). The alkalinity can be adjusted using the alkaline agent (A) blended in the first agent.

[0067] (Dosage form) The dosage form of the first agent in the first embodiment may be appropriately determined, and examples of the dosage form include liquid, cream, gel, and powder.

[0068] (Manufacturing method) The method for producing the first agent of the first embodiment is not particularly limited, and any known method for producing a hair composition containing an oxidative dye may be used depending on the form and ingredients of the first agent. For example, the first agent may be produced by mixing component (A) and component (B) by a conventional method.

[0069] (Second agent of the first embodiment) The second agent of the oxidation hair dye of the first embodiment (hereinafter referred to as "the second agent of the first embodiment") contains one or more oxidizing agents.

[0070] (oxidizing agent) Examples of the oxidizing agent contained in the second agent of the first embodiment include hydrogen peroxide, bromates, percarbonates, and perborates.

[0071] In the second agent of the first embodiment, the blending amount of the oxidizing agent ranges, for example, from 0.01% by mass to 10% by mass. Note that the blending amount of the oxidizing agent blended in the second agent of the first embodiment is preferably 8% by mass or less, from the viewpoint of reducing the risk of hair damage.

[0072] (Optional ingredient of second agent) The second agent may contain an appropriate blend of other components (hereinafter referred to as "optional components of the second agent") other than the above-mentioned oxidizing agent. The optional components of the second agent may be appropriately selected from known components used in oxidation hair dyes, and examples thereof include water, nonionic surfactants, cationic surfactants, anionic surfactants, higher alcohols, polyhydric alcohols, lower alcohols, hydrocarbons, oils and fats, ester oils, silicones, chelating agents, etc.

[0073] The second agent of the first embodiment may be, for example, a blend of one or more higher alcohols having 12 to 24 carbon atoms. The blending amount of the higher alcohol having 12 to 24 carbon atoms in the third agent of the first embodiment is, for example, 2 to 10% by mass.

[0074] The second agent of the first embodiment may contain, for example, one or more nonionic surfactants. The amount of nonionic surfactant contained in the second agent of the first embodiment is, for example, 0.5% by mass or more and 5% by mass or less.

[0075] The second agent of the first embodiment may contain, for example, one or more anionic surfactants. The amount of anionic surfactant contained in the second agent of the first embodiment is, for example, 0.5% by mass or more and 5% by mass or less.

[0076] The second agent of the first embodiment may contain, for example, one or more cationic surfactants. The amount of cationic surfactant contained in the second agent of the first embodiment is, for example, 0.5% by mass or more and 3% by mass or less.

[0077] The second agent of the first embodiment may contain, for example, one or more polyhydric alcohols. The amount of polyhydric alcohol contained in the third agent of the first embodiment is, for example, 0.01% by mass or more and 10% by mass or less.

[0078] The second agent of the first embodiment may contain water. The amount of water contained in the second agent of the first embodiment is, for example, 30% by mass or more and 70% by mass or less.

[0079] (viscosity) The viscosity of the second part of the first embodiment is set as appropriate, but is, for example, 1,000 mPa·s or more and 10,000 mPa·s or less. Here, the viscosity of the second part of the first embodiment is the value measured after 60 seconds at 25°C using a Brookfield viscometer with a rotor selected according to the viscosity. The rotor rotation speed during measurement is, for example, 12 rpm.

[0080] (pH) The pH of the second agent in the first embodiment is preferably 8.0 or more and 13.0 or less, and more preferably 8.5 or more and 11.0 or less, from the viewpoint of allowing the oxidative dye contained in the oxidative hair dye to penetrate deeper into the hair and achieving a darker color. The pH is measured at 25°C using a known pH meter.

[0081] (Dosage form) The dosage form of the second agent of the first embodiment may be appropriately determined, and examples of the dosage form include liquid, cream, gel, and powder.

[0082] (Manufacturing method) The method for producing the second agent of the first embodiment is not particularly limited, and a known method for producing a hair composition containing an oxidizing agent may be used depending on the form and ingredients of the second agent. For example, the second agent may be produced by mixing the oxidizing agent and optional ingredients of the second agent selected as needed using a conventional method.

[0083] (Third agent of the first embodiment) The third agent of the oxidation hair dye of the first embodiment (hereinafter referred to as "the third agent of the first embodiment") contains one or more selected from (C) 1-naphthol and (D) 2,6-diaminopyridine.

[0084] The third agent of the first embodiment may contain only the component (C), only the component (D), or both the components (C) and (D). From the viewpoint of more effectively suppressing a decrease in saturation, it is preferable that the third agent of the first embodiment contains both the component (C) and the component (D).

[0085] (Component (C): 1-naphthol) The component (C) blended in the third agent of the first embodiment is 1-naphthol (also known as α-naphthol).

[0086] The amount of component (C) blended in the third agent of the first embodiment ranges, for example, from 0.01% by mass to 2% by mass.

[0087] The amount of component (C) blended into the third agent of the first embodiment is preferably 0.05% by mass or more, more preferably 0.2% by mass or more, and even more preferably 0.4% by mass or more, from the viewpoint of more effectively suppressing a decrease in saturation.

[0088] The amount of component (C) blended into the third agent of the first embodiment is preferably 1% by mass or less, more preferably 0.8% by mass or less, and even more preferably 0.6% by mass or less, from the viewpoint of more effectively suppressing a decrease in saturation.

[0089] From the above-mentioned viewpoints, the range of the amount of component (C) to be blended in the third agent of the first embodiment is preferably 0.05 mass% or more and 1 mass% or less, more preferably 0.2 mass% or more and 0.8 mass% or less, and even more preferably 0.4 mass% or more and 0.6 mass% or less.

[0090] (Component (D): 2,6-diaminopyridine) The component (D) contained in the third agent of the first embodiment is 2,6-diaminopyridine.

[0091] The amount of component (D) blended into the third agent of the first embodiment is preferably 0.01% by mass or more, more preferably 0.02% by mass or more, and even more preferably 0.03% by mass or more, from the viewpoint of more effectively suppressing a decrease in saturation.

[0092] The amount of component (D) blended in the third agent of the first embodiment is preferably 0.2% by mass or less, more preferably 0.1% by mass or less, and even more preferably 0.06% by mass or less, from the viewpoint of more effectively suppressing a decrease in saturation.

[0093] From the above viewpoints, the range of the amount of component (D) to be blended in the third agent of the first embodiment is preferably 0.01 mass% or more and 0.2 mass% or less, more preferably 0.02 mass% or more and 0.1 mass% or less, and even more preferably 0.03 mass% or more and 0.06 mass% or less.

[0094] (Optional ingredient of the third agent) The third agent of the first embodiment may contain an appropriate blend of other components (hereinafter referred to as "optional components of the third agent") in addition to the above-mentioned components (C) and (D). The optional components of the third agent may be appropriately selected from known components used in oxidation hair dyes, and examples thereof include water, alkaline agents, nonionic surfactants, cationic surfactants, anionic surfactants, higher alcohols, polyhydric alcohols, lower alcohols, hydrocarbons, fats and oils, ester oils, silicones, antioxidants, chelating agents, and oxidation dyes other than components (C) and (D).

[0095] (Alkaline agent) From the viewpoint of improving hair dyeability, the third agent of the first embodiment preferably contains one or more alkaline agents. The alkaline agents improve hair dyeability by swelling the hair and increasing the penetration of the oxidative dye (component (A), component (B), etc.) into the hair when the oxidative hair dye of the first embodiment is used for hair dyeing.

[0096] Examples of alkaline agents that can be incorporated into the third agent of the first embodiment include aqueous ammonia, alkanolamines (monoethanolamine, triethanolamine, isopropanolamine, etc.), metal hydroxides (sodium hydroxide, potassium hydroxide, etc.), metal carbonates (sodium carbonate, potassium carbonate, etc.), metal phosphates (e.g., sodium phosphate, etc.), and ammonium salts (ammonium carbonate, ammonium bicarbonate, ammonium sulfate, etc.).

[0097] The amount of alkaline agent blended into the third agent of the first embodiment is, for example, 0.1% by mass or more, but from the viewpoint of allowing the oxidative dye to penetrate more deeply into the hair and achieving a darker dye, it is preferably 0.5% by mass or more, more preferably 0.8% by mass or more, and even more preferably 1% by mass or more.

[0098] The amount of alkaline agent blended into the third agent of the first embodiment is, for example, 20% by mass or less, but from the viewpoint of reducing the risk of hair damage, it is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less.

[0099] The range of the amount of alkaline agent contained in the third agent of the first embodiment is, for example, 0.1% by mass or more and 20% by mass or less, but from the above-mentioned viewpoint, 0.5% by mass or more and 10% by mass or less is preferable, 0.8% by mass or more and 5% by mass or less is more preferable, and 1% by mass or more and 3% by mass or less is even more preferable.

[0100] The third agent of the first embodiment may contain an oxidation dye other than components (C) and (D). Examples of oxidation dyes other than components (C) and (D) include dye intermediates such as phenylenediamine derivatives such as paraphenylenediamine, nitroparaphenylenediamine hydrochloride, and nitroparaphenylenediamine; and phenol derivatives such as 2,4-diaminophenol hydrochloride, orthoaminophenol sulfate, and orthoaminophenol. Examples of oxidation dyes other than components (C) and (D) include resorcinol; phenylenediamine derivatives such as metaphenylenediamine hydrochloride and metaphenylenediamine; aminophenol derivatives such as 5-aminoorthocresol sulfate, 5-aminoorthocresol, and metaaminophenol; and couplers such as 2,4-diaminophenoxyethanol hydrochloride.

[0101] The third agent of the first embodiment may be, for example, a blend of one or more higher alcohols having 12 to 24 carbon atoms. The blending amount of the higher alcohol having 12 to 24 carbon atoms in the third agent of the first embodiment is, for example, 2% by mass to 10% by mass.

[0102] The third agent of the first embodiment may contain, for example, one or more nonionic surfactants. The amount of nonionic surfactant contained in the third agent of the first embodiment is, for example, 0.5% by mass or more and 5% by mass or less.

[0103] The third agent of the first embodiment may contain, for example, one or more anionic surfactants. The amount of the anionic surfactant contained in the third agent of the first embodiment is, for example, 0.5% by mass or more and 5% by mass or less.

[0104] The third agent of the first embodiment may contain, for example, one or more cationic surfactants. The amount of cationic surfactant contained in the third agent of the first embodiment is, for example, 0.5% by mass or more and 3% by mass or less.

[0105] The third agent of the first embodiment may contain, for example, one or more polyhydric alcohols. The amount of polyhydric alcohol contained in the third agent of the first embodiment is, for example, 0.01% by mass or more and 10% by mass or less.

[0106] The third agent of the first embodiment may contain water blended in. The blending amount of water in the third agent of the first embodiment is, for example, 30% by mass or more and 70% by mass or less.

[0107] (viscosity) The viscosity of the third part of the first embodiment is set as appropriate, but is, for example, 1,000 mPa·s or more and 50,000 mPa·s or less. Here, the viscosity of the third part of the first embodiment is the value measured after 60 seconds at 25°C using a Brookfield viscometer with a rotor selected according to the viscosity. The rotor rotation speed during measurement is, for example, 12 rpm.

[0108] (pH) The pH of the third agent in the first embodiment is preferably 8.0 or more and 13.0 or less, and more preferably 8.5 or more and 11.0 or less, from the viewpoint of allowing the oxidative dye contained in the oxidative hair dye to penetrate deeper into the hair and achieving a darker color. The pH is measured at 25°C using a known pH meter.

[0109] (alkalinity) The alkalinity of the third agent of the first embodiment is, for example, 0.5 or more and 20.0 or less. Here, "alkalinity" refers to the volume of 0.1 mol / L hydrochloric acid required to neutralize 1 g of the oxidation hair dye (unit of alkalinity: ml). The alkalinity can be adjusted using the alkaline agent (A) blended in the first agent.

[0110] (Dosage form) The dosage form of the third agent of the first embodiment may be appropriately determined, and examples of the dosage form include liquid, cream, gel, and powder.

[0111] (Manufacturing method) The method for producing the third agent of the first embodiment is not particularly limited, and any known method for producing a hair composition containing an oxidative dye may be used depending on the form and ingredients of the third agent. For example, the third agent may be produced by mixing one or more components selected from component (C) and component (D) by a conventional method.

[0112] (Total amount of component (A) in the oxidation hair dye in non-salt form) In the oxidation hair dye of the first embodiment, the total amount of each of paraphenylenediamine, toluene-2,5-diamine, and 2,2'-[(4-aminophenyl)imino]bisethanol, and the total amount of the salt of paraphenylenediamine, the salt of toluene-2,5-diamine, and the salt of 2,2'-[(4-aminophenyl)imino]bisethanol when converted to paraphenylenediamine, toluene-2,5-diamine, and 2,2'-[(4-aminophenyl)imino]bisethanol, respectively (hereinafter referred to as "total amount of component (A) in a non-salt form") is, for example, 0.005% by mass or more and 2% by mass or less.

[0113] (Total amount of component (B) in the oxidation hair dye in non-salt form) In the oxidation hair dye of the first embodiment, the total amount of each of resorcinol and 2,4-diaminophenoxyethanol, and the amount of the salt of 2,4-diaminophenoxyethanol converted to 2,4-diaminophenoxyethanol (hereinafter referred to as the "total amount of component (B) in a non-salt form") is, for example, 0.005% by mass or more and 2% by mass or less.

[0114] ((A) / (B) ratio) In the oxidation hair dye of the first embodiment, the mass ratio of the total amount of the component (A) in its non-salt form to the total amount of the component (B) in its non-salt form (hereinafter referred to as the "(A) / (B) ratio") is not particularly limited and can be set as appropriate.

[0115] The (A) / (B) ratio in the oxidation hair dye of the first embodiment is, for example, 0.1 or more, but from the viewpoint of better suppressing the decrease in saturation, it is preferably 0.5 or more, more preferably 0.8 or more, and even more preferably 1 or more.

[0116] The (A) / (B) ratio in the oxidation hair dye of the first embodiment is, for example, 10 or less, but from the viewpoint of better suppressing the decrease in saturation, it is preferably less than 5.88, more preferably 3 or less, and even more preferably 2 or less.

[0117] The (A) / (B) ratio in the oxidation hair dye of the first embodiment is, for example, in the range of 0.1 or more and 10 or less, but from the above-mentioned viewpoint, it is preferably in the range of 0.5 or more and less than 5.88, more preferably in the range of 0.8 or more and 3 or less, and even more preferably in the range of 1 or more and 2 or less.

[0118] ((C) / (D) ratio) In the oxidation hair dye of the first embodiment, the mass ratio of the amount of component (C) to the amount of component (D) (hereinafter referred to as the "(A) / (B) ratio") is not particularly limited and can be set as appropriate.

[0119] The (C) / (D) ratio in the oxidation hair dye of the first embodiment is, for example, 0.1 or more, but from the viewpoint of better suppressing the decrease in saturation, it is preferably 1 or more, more preferably 2 or more, and even more preferably 3 or more.

[0120] The (C) / (D) ratio in the oxidation hair dye of the first embodiment is, for example, 50 or less, but from the viewpoint of better suppression of hue change, it is preferably 40 or less, more preferably 30 or less, and even more preferably 25 or less.

[0121] The range of the (C) / (D) ratio in the oxidation hair dye of the first embodiment is, for example, 0.1 or more and 50 or less, but from the above-mentioned viewpoint, it is preferably 1 or more and 40 or less, more preferably 2 or more and 30 or less, and even more preferably 3 or more and 25 or less.

[0122] (Content of para-aminophenol or its salts in oxidation hair dyes) In order to make the oxidation hair dye of the first embodiment more excellent in suppressing a decrease in saturation and a change in hue, it is preferable that the oxidation hair dye of the first embodiment does not contain para-aminophenol or a salt thereof, or that the content of para-aminophenol or a salt thereof is 0.5 mass% or less.

[0123] When the oxidation hair dye of the first embodiment contains para-aminophenol or a salt thereof, the content thereof may be 0.4% by mass or less, 0.3% by mass or less, 0.2% by mass or less, 0.1% by mass or less, 0.05% by mass or less, 0.03% by mass or less, or 0.01% by mass or less.

[0124] (5-aminoorthocresol or its salt content in oxidation hair dyes) In order to achieve better suppression of saturation loss, the oxidation hair dye of the first embodiment preferably does not contain 5-aminoorthocresol or a salt thereof, or the content of 5-aminoorthocresol or a salt thereof is preferably 0.25 mass% or less.

[0125] When the oxidation hair dye of the first embodiment contains 5-aminoorthocresol or a salt thereof, the content thereof may be 0.20% by mass or less, 0.15% by mass or less, 0.10% by mass or less, 0.05% by mass or less, 0.03% by mass or less, or 0.01% by mass or less.

[0126] (viscosity) The viscosity of the oxidation hair dye of the first embodiment is set as appropriate, but is, for example, 1,000 mPa·s or more and 50,000 mPa·s or less. Here, the viscosity of the first agent of the first embodiment is the value measured after 60 seconds at 25°C using a Brookfield viscometer with a rotor selected according to the viscosity. The rotor rotation speed during measurement is, for example, 12 rpm.

[0127] (pH) The pH of the oxidative hair dye of the first embodiment is preferably 8.0 or higher and 13.0 or lower, and more preferably 8.5 or higher and 11.0 or lower, from the viewpoint of allowing the oxidative dye contained in the oxidative hair dye to penetrate deeper into the hair and achieving a darker color. The pH is measured at 25°C using a known pH meter.

[0128] (alkalinity) The alkalinity of the oxidative hair dye of the first embodiment is, for example, 0.5 or more and 20.0 or less. Here, "alkalinity" refers to the volume of 0.1 mol / L hydrochloric acid required to neutralize 1 g of the oxidative hair dye (unit of alkalinity: ml). The alkalinity can be adjusted using the alkaline agent (A) blended in the first pack.

[0129] (Dosage form) The formulation of the oxidation hair dye of the first embodiment may be appropriately determined, and examples of the formulation include liquid, cream, gel, and powder.

[0130] (Manufacturing method) The method for producing the oxidation hair dye of the first embodiment is not particularly limited, and the oxidation hair dye of the first embodiment can be produced by mixing the above-mentioned first agent of the first embodiment, the second agent of the first embodiment, and the third agent of the first embodiment at any desired mixing ratio. For example, the mixing ratio may be a mass ratio of first agent:second agent:third agent of 0.5 to 1:0.5 to 2:0.1 to 0.5. The oxidation hair dye of the first embodiment may be produced by mixing two agents selected from the first agent of the first embodiment, the second agent of the first embodiment, and the third agent of the first embodiment, and then mixing the remaining agent. Alternatively, the oxidation hair dye of the first embodiment may be produced by simultaneously mixing the first agent of the first embodiment, the second agent of the first embodiment, and the third agent of the first embodiment.

[0131] (How to use) The method of using the oxidative hair dye of the present embodiment is not particularly limited, and any known method for using an oxidative hair dye can be used.

[0132] The oxidative hair dye of this embodiment may be used for hair dyeing in combination with, for example, a two-component oxidative hair dye that uses the first agent and the second agent of Embodiment 1. For example, in a subject whose hair has a mixture of hair that has not been oxidatively dyed and hair that has been oxidatively dyed, the hair that has not been oxidatively dyed (e.g., hair at the roots that has not been treated with oxidative dyeing) can be dyed to a desired hue using the two-component oxidative hair dye, while the hair that has been oxidatively dyed (e.g., a portion of hair approximately 15 cm from the ends toward the middle) can be dyed to a hue different from that used with the two-component oxidative hair dye using the oxidative hair dye of this embodiment, thereby enabling a variety of hues to be expressed over the entire hair.

[0133] The oxidative hair dye of this embodiment may be used for hair dyeing in combination with a two-component oxidative hair dye, for example, a mixture of a first agent according to the oxidative hair dye of this embodiment and a second agent according to the oxidative hair dye of this embodiment.

[0134] (Hair for which oxidative hair dyes are used) The target hair for the oxidative hair dye of the first embodiment is not particularly limited. The oxidative hair dye of the first embodiment can suppress a decrease in saturation even when used on hair with high brightness (for example, bleached hair) or colored hair that has been dyed with an oxidative hair dye, thereby achieving highly saturated hair coloring. Therefore, the oxidative hair dye of the first embodiment may be used on bleached hair or colored hair.

[0135] <Third agent in oxidation hair dye> The third agent of this embodiment is a third agent in an oxidation hair dye that is used by mixing a first agent, a second agent, and a third agent, and the first agent is a blend of (A) one or more selected from paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof, and (B) one or more selected from resorcinol and 2,4-diaminophenoxyethanol or salts thereof, the second agent is a blend of an oxidizing agent, and the third agent is a blend of one or more selected from (C) 1-naphthol, and (D) 2,6-diaminopyridine.

[0136] The third agent of this embodiment may be the same as the third agent of the first embodiment described above.

[0137] Furthermore, the first and second agents of the third agent of this embodiment may be similar to the first and second agents of the first embodiment described above, respectively.

[0138] <Oxidative hair dye of second embodiment> The oxidation hair dye of the second embodiment is an oxidation hair dye that is used by mixing a first agent containing an oxidation dye, a second agent containing an oxidizing agent, and a third agent containing an oxidation dye different from the oxidation dye contained in the first agent, The saturation value C*(I) of hair dyed with a mixed agent (I) obtained by mixing the first agent and the second agent in a mass ratio of the first agent:the second agent=1:1 is measured with a spectrophotometer (measurement mode: SCE measurement), and The saturation value C*(II) of hair dyed with a mixed agent (II) obtained by mixing the first agent, the second agent, and the third agent in a mass ratio of the first agent:the second agent:the third agent = 0.8:1:0.2 is measured with a spectrophotometer (measurement mode: SCE measurement), and The value of ΔC* calculated from the formula ΔC*=C*(II)-C*(I) is 0 or more. Oxidative hair dye.

[0139] In the oxidation hair dye of the second embodiment, from the viewpoint of being better at suppressing a decrease in saturation, the value of ΔC* is preferably 0.1 or more, 0.3 or more, 0.5 or more, 1 or more, 3 or more, 5 or more, or 10 or more, and from the above viewpoint, the larger the lower limit value, the more preferable.

[0140] (First agent of the second embodiment) The first agent of the oxidation hair dye of the second embodiment (hereinafter referred to as "the first agent of the second embodiment") contains one or more oxidation dyes.

[0141] The oxidation dye to be blended in the first agent of the second embodiment may be appropriately selected from oxidation dyes used in known oxidation hair dyes.

[0142] The oxidation dye to be blended in the first agent of the second embodiment is preferably a combination of (A) one or more selected from paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof, and (B) one or more selected from resorcinol and 2,4-diaminophenoxyethanol or salts thereof.

[0143] The first agent of the second embodiment may be one in which the "optional components of the first agent (excluding the oxidation dye)" in the first agent of the first embodiment described above are appropriately blended.

[0144] The first agent of the second embodiment may be the same as the first agent of the first embodiment described above.

[0145] (Second agent of second embodiment) The second agent of the oxidation hair dye of the second embodiment (hereinafter referred to as "the second agent of the second embodiment") contains one or more oxidizing agents.

[0146] The second agent of the second embodiment may be the same as the second agent of the first embodiment described above.

[0147] (Third agent of the second embodiment) The third agent of the oxidative hair dye of the second embodiment (hereinafter referred to as the "third agent of the second embodiment") contains one or more oxidative dyes (hereinafter referred to as the "oxidative dye of the third agent") that are different from the oxidative dyes contained in the first agent.

[0148] The oxidation dye of the third agent may be appropriately selected from oxidation dyes used in known oxidation hair dyes.

[0149] The oxidation dye of the third agent is preferably one or more selected from (C) 1-naphthol and 2,6-diaminopyridine.

[0150] The third agent of the second embodiment may be one in which the "optional components of the third agent (excluding the oxidation dye)" in the third agent of the first embodiment described above are appropriately blended.

[0151] The third agent of the second embodiment may be the same as the third agent of the first embodiment described above.

[0152] The oxidation hair dye of the second embodiment is a mixture (I) obtained by mixing the first agent of the second embodiment and the second agent of the second embodiment in a mass ratio of the first agent:the second agent = 1:1, and the hue angle measured with a spectrophotometer (measurement mode: SCE measurement) is h(I), The hue angle of hair dyed with a mixed agent (II) obtained by mixing the first agent, the second agent, and the third agent in a mass ratio of the first agent:the second agent:the third agent = 0.8:1:0.2 is measured with a spectrophotometer (measurement mode: SCE measurement), and is defined as h(II); It is preferable that the value of the difference (hα) in hue angle obtained from the following formulas (2) and (3) is 0 or more and 40 or less, from the viewpoint of more excellent suppression of hue change. α = |h(I)-h(II)| (2) Hue angle difference (hα) = |α-(360×N)| (3) (In the above formula (3), the value of α calculated by formula (2) is N=0 when α≦180, and N=1 when α>180.)

[0153] In the oxidation hair dye of the second embodiment, from the viewpoint of being better at suppressing hue change, the value of α is preferably 0 or more and 30 or less, more preferably 0 or more and 20 or less, even more preferably 0 or more and 10 or less, and particularly preferably 0 or more and 5 or less.

[0154] The oxidative hair dye of the second embodiment may be similar to the oxidative hair dye of the first embodiment described above in terms of the "total amount of component (A) in the non-salt form of the oxidative hair dye," "total amount of component (B) in the non-salt form of the oxidative hair dye," "(A) / (B) ratio," "(C) / (D) ratio," "content of para-aminophenol or a salt thereof in the oxidative hair dye," "content of 5-aminoorthocresol or a salt thereof in the oxidative hair dye," "viscosity," "pH," "alkalinity," "formulation," "manufacturing method," "method of use," and "target hair for the oxidative hair dye."

[0155] <Oxidation hair dye kit> The oxidation hair dye kit of this embodiment is an oxidation hair dye kit including a first agent, a second agent, and a third agent, wherein the first agent contains (A) one or more selected from paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof, and (B) one or more selected from resorcinol, and 2,4-diaminophenoxyethanol or salts thereof, The second agent contains an oxidizing agent, The third agent contains one or more selected from (C) 1-naphthol and (D) 2,6-diaminopyridine.

[0156] The oxidative hair dye kit of this embodiment may be a kit for obtaining the oxidative hair dye of the above-mentioned first embodiment. In this case, the oxidative hair dye kit of this embodiment may have the same "viscosity," "pH," "alkalinity," "formulation," "production method," and "use method" as the oxidative hair dye of the above-mentioned first embodiment.

[0157] The first, second and third agents of the oxidation hair dye kit of this embodiment may be the same as the first, second and third agents of the first embodiment described above, respectively.

[0158] The oxidative hair dye kit of this embodiment may be similar to the "total amount of component (A) in the oxidative hair dye in its non-salt form," "total amount of component (B) in the oxidative hair dye in its non-salt form," "(A) / (B) ratio," "(C) / (D) ratio," "content of para-aminophenol or a salt thereof in the oxidative hair dye," "content of 5-aminoorthocresol or a salt thereof in the oxidative hair dye," and "target hair for the oxidative hair dye" in the oxidative hair dye of the first embodiment described above.

[0159] <Hair dyeing method of the first embodiment> The hair dyeing method of the first embodiment is a hair dyeing method using the oxidative hair dye of the first embodiment described above. According to the hair dyeing method of the first embodiment, a hair dyeing method using the oxidative hair dye of the first embodiment described above can be provided.

[0160] The hair dyeing method of the first embodiment can employ any known hair dyeing method other than using the oxidative hair dye of the first embodiment described above. For example, the hair dyeing method of the first embodiment may employ the method of using the oxidative hair dye of the first embodiment.

[0161] <Hair dyeing method of the second embodiment> The hair dyeing method of the second embodiment is a hair dyeing method using the oxidative hair dye of the second embodiment described above. According to the hair dyeing method of the second embodiment, a hair dyeing method using the oxidative hair dye of the second embodiment described above can be provided.

[0162] The hair dyeing method of the second embodiment can employ any known hair dyeing method other than using the oxidative hair dye of the second embodiment described above. For example, the hair dyeing method of the second embodiment may employ the method of using the oxidative hair dye of the second embodiment.

[0163] <Modification> This embodiment includes the following modifications 1 and 2.

[0164] (Variation 1) Variant 1 of this embodiment is an oxidative hair dye kit for obtaining the oxidative hair dye of the above-mentioned embodiment 2. The oxidative hair dye kit of variant 1 of this embodiment may be appropriately designed with reference to the description of the oxidative hair dye of the above-mentioned embodiment 2.

[0165] (Variation 2) Variation 2 of this embodiment is a method for producing the oxidative hair dye of the above-mentioned first or second embodiment. The method of Variation 2 of this embodiment may be appropriately set by referring to the description of the production method for the oxidative hair dye of the first embodiment or the production method for the oxidative hair dye of the second embodiment. [Example]

[0166] The present invention will be described in detail below based on examples, but the present invention should not be construed as being limited by the descriptions in these examples.

[0167] (Manufacturing of 1st, 2nd and 3rd agents) The first, second and third agents of the oxidation hair dyes of Examples 1 to 24 and Comparative Examples 1 to 6 were prepared as follows.

[0168] (Manufacturing of the first agent) The first agents for the oxidation hair dyes of Examples 1 to 24 and Comparative Examples 1 to 6 were prepared by mixing the ingredients in a conventional manner to obtain the composition of the first agent used in each Example or Comparative Example's oxidation hair dye as shown in Tables 1 to 7. Each of the prepared first agents was in cream form. The "other ingredients" listed in Tables 1 to 7 are as follows:

[0169] (Other ingredients in the first agent) Cetyl alcohol 4.0% by mass, stearyl alcohol 4.0% by mass, trade name: Clodaphos CES (containing dicetyl phosphate) 1.5% by mass, polyoxyethylene cetyl ether (10E.O.) 3.0% by mass, polyoxyethylene cetyl ether (30E.O.) 1.0% by mass, propylene glycol 1.0% by mass, ammonia water 1.5% by mass, sodium sulfite (anhydrous) 0.2% by mass, L-ascorbic acid 0.15% by mass, ethylenediaminehydroxyethyltriacetate trisodium dihydrate 0.2% by mass, fragrance 0.1% by mass

[0170] The first agents of the oxidation hair dyes of Examples 4 to 15, 17 to 24, and Comparative Example 6 were produced using salt forms of toluene-2,5-diamine sulfate, 2,2'-[(4-aminophenyl)imino]bisethanol sulfate, and 2,4-diaminophenoxyethanol hydrochloride. Tables 1 to 7 show the values ​​calculated as pure content for toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and 2,4-diaminophenoxyethanol. The values ​​listed in the ingredient columns of Tables 1 to 7 are in mass %, and "-" indicates that the component is not blended.

[0171] (Manufacturing of second agent) The second agents (composition A) of the oxidation hair dyes of Examples 1 to 24 and Comparative Examples 1 to 6 were prepared by mixing the components in a conventional manner to obtain the following compositions.

[0172] (Composition A) Cetyl alcohol 2.4% by mass Stearyl alcohol 1.2% by mass Polyoxyethylene cetyl ether (15E.O.) 1.3% by mass Hydrogen peroxide solution 3% by mass Purified water 92.1% by mass

[0173] (Production of third agent) The third agents of the oxidation hair dyes of Examples 1 to 24 and Comparative Examples 1 to 6 were prepared by mixing the components in a conventional manner to obtain the compositions of the third agents shown in Tables 1 to 7. Each of the prepared third agents was cream-like. The "other ingredients" in the third agents shown in Tables 1 to 7 have the same composition as the "other ingredients" blended in the first agent.

[0174] (manufacturing oxidation hair dyes) The oxidative hair dyes of Examples 1 to 24 and Comparative Examples 1 to 6 were produced using the first, second, and third agents prepared above, respectively, in the combinations shown in Tables 1 to 7. When producing each oxidative hair dye, 1.2 g of the first agent, 1.5 g of the second agent, and 0.3 g of the third agent were mixed. Furthermore, reference oxidative hair dyes (reference oxidative hair dyes used to evaluate the oxidative hair dyes of Examples 1 to 24 and Comparative Examples 1 to 6) were produced by mixing 1.5 g of the first agent and 1.5 g of the second agent from the oxidative hair dyes of Examples 1 to 24 and Comparative Examples 1 to 6 without using the third agent.

[0175] (evaluation) The following hair dyeing treatment was carried out using the oxidative hair dyes of Examples 1 to 24 and Comparative Examples 1 to 6, and each of the reference oxidative hair dyes, and the items of "inhibition of saturation decrease (Evaluation 1)" and "inhibition of hue change (Evaluation 2)" were evaluated.

[0176] (hair dye treatment) To a hair bundle (Beaulux "BM-YK-A": approximately 1 g, approximately 10 cm of yak hair bundle), 3 g of either the oxidative hair dye of Examples 1 to 24, Comparative Examples 1 to 6, or a reference oxidative hair dye used in the evaluation of the oxidative hair dyes of Examples 1 to 24, and Comparative Examples 1 to 6 was applied and left to stand at room temperature for 20 minutes. After 20 minutes, each hair bundle was washed with water, and then an appropriate amount of shampoo (Milbon "Grand Linkage Willow Luxe Shampoo") was applied and washed, followed by rinsing with water and drying with a hair dryer.

[0177] The hair bundles that had undergone the above-described hair dyeing treatment were measured using a spectrophotometer (Konica Minolta Sensing's "Spectrophotometer CM-5") under the SCE measurement (specular reflection excluded) measurement mode. The hair bundles that had not undergone the above-described hair dyeing treatment were also measured using the spectrophotometer under the same conditions. The C value obtained was used to subtract the C value of the hair bundle that had not undergone the hair dyeing treatment from the C value of the hair bundle that had undergone the hair dyeing treatment to obtain the C* value for each hair bundle that had undergone the hair dyeing treatment. Furthermore, the h value for each hair bundle that had undergone the hair dyeing treatment was obtained from the above-described measurement. The C* value represents the saturation value, and the h value represents the hue angle.

[0178] (Rating 1: Suppression of saturation loss) Using the C* values ​​obtained by measurement with a spectrophotometer, ΔC* values ​​for the oxidation hair dyes of Examples 1 to 24 and Comparative Examples 1 to 6, with and without the use of a third agent, were calculated according to the following formula.

[0179] ΔC*=C*(I)-C*(II) (1)

[0180] In formula (1), C*(I) is the C* value of a hair tress dyed with a reference oxidative hair dye (each containing a first and second agent, but no third agent) used in evaluating the oxidative hair dyes of Examples 1 to 24 and Comparative Examples 1 to 6. C*(II) is the C* value of a hair tress dyed with an oxidative hair dye (each containing a first, second, and third agent) of Examples 1 to 24 and Comparative Examples 1 to 6.

[0181] Here, the larger the value of ΔC*, the better the reduction in saturation is suppressed in the oxidation hair dye obtained by mixing at least the first, second and third agents.

[0182] (Rating 2: Suppression of hue changes) Using the h value obtained by measurement with a spectrophotometer, the difference in hue angle (hα) between the presence or absence of the third agent in Examples 1 to 24 and Comparative Examples 1 to 6 was calculated using the following equations (2) and (3).

[0183] α = |h(I)-h(II)| (2)

[0184] In formula (2), h(I) is the hue angle h of a hair strand dyed with a reference oxidative hair dye (using the first and second agents, but not the third agent) used in evaluating the oxidative hair dyes of Examples 1 to 24 and Comparative Examples 1 to 6. Also, h(II) is the hue angle h of a hair strand dyed with an oxidative hair dye (using the first, second, and third agents) of Examples 1 to 24 and Comparative Examples 1 to 6. α is the absolute value of the difference between h(I) and h(II).

[0185] Hue angle difference (hα) = |α-(360×N)| (3) (In equation (3), the value of α calculated by equation (2) is N=0 when α≦180, and N=1 when α>180.)

[0186] The hue angle difference (hα) in equation (3) is the absolute value of the value obtained by subtracting 360 × N (N = 0 when α≦180, and N = 1 when α>180) from α calculated by equation (2).

[0187] Here, the smaller the value of the "hue angle difference (hα)" obtained from the above formulas (2) and (3), the better the hue change can be suppressed in the oxidative hair dye obtained by mixing at least the first agent, the second agent, and the third agent.

[0188] (Evaluation results) Tables 1 to 7 below show the evaluation results for the oxidation hair dyes of Examples 1 to 28 and Comparative Examples 1 to 6.

[0189] (Evaluation results of Examples 1 and 2 and Comparative Example 1) The evaluation results of the oxidation hair dyes of Examples 1 and 2 and Comparative Example 1 are shown in Table 1.

[0190] [Table 1]

[0191] From the results shown in Table 1, the oxidative hair dyes of Examples 1 and 2 (containing either component (C) or component (D) in the third agent) had higher ΔC* values ​​than the oxidative hair dye of Comparative Example 1 (containing resorcinol in the third agent, but not containing either component (C) or (D)). Therefore, it can be seen that oxidative hair dyes containing components (A) and (B) in the first agent and component (C) or component (D) in the third agent are excellent at suppressing loss of saturation. Furthermore, the oxidative hair dye of Example 2 (containing component (D) in the third agent) had a higher ΔC* value than the oxidative hair dye of Example 1 (containing component (C) in the third agent), but also a larger hα (difference in hue angle). Therefore, in an oxidation hair dye obtained by mixing at least the first, second, and third agents, when component (D) is added to the third agent, it is more effective in suppressing the decrease in saturation, and when component (C) is added to the third agent, it is more effective in suppressing the change in hue.

[0192] (Evaluation results of Examples 3 to 15 and Comparative Examples 2 to 6) The evaluation results of the oxidation hair dyes of Examples 3 to 15 and Comparative Examples 2 to 6 are shown in Tables 2 to 5.

[0193] [Table 2]

[0194] [Table 3]

[0195] [Table 4]

[0196] [Table 5]

[0197] From the results shown in Tables 2 to 5, the oxidative hair dyes of Examples 3 to 15 (in which the first agent contains components (A) and (B)) all had larger ΔC* values ​​than the oxidative hair dyes of Comparative Examples 2 to 6 (in which the first agent does not contain either component (A) or component (B)). Therefore, it can be seen that oxidative hair dyes in which the first agent contains components (A) and (B) and the third agent contains component (C) or (D) are excellent at suppressing loss of saturation.

[0198] From the results shown in Table 2, the oxidative hair dye of Example 5 (in which toluene-2,5-diamine was blended as component (A) in the first pack) had a larger ΔC* value than the oxidative hair dyes of Examples 3 and 4 (in which 2,2'-[(4-aminophenyl)imino]bisethanol or paraphenylenediamine was blended as component (A) in the first pack). Therefore, it can be seen that the oxidative hair dyes in which toluene-2,5-diamine was blended as component (A) in the first pack are better at suppressing saturation loss.

[0199] From the results shown in Tables 1 and 2, the oxidative hair dye of Example 3 (component (C) and component (D) blended in the third agent) had a larger ΔC* value than the oxidative hair dye of Examples 1 and 2 (component (C) or component (D) blended in the third agent). Therefore, it can be seen that in an oxidative hair dye obtained by mixing at least the first, second, and third agents, when component (C) and component (D) are blended in combination in the third agent, they are more effective in suppressing the decrease in saturation.

[0200] From the results shown in Tables 2 and 3, the oxidative hair dye of Example 3 (resorcinol blended as component (B) in the first agent) had a larger ΔC* value but a larger hue angle difference (hα) value than the oxidative hair dye of Example 7 (2,4-diaminophenoxyethanol blended as component (B) in the first agent). Therefore, it can be seen that in an oxidative hair dye obtained by mixing at least the first, second, and third agents, when resorcinol is blended as component (B) in the first agent, it is more effective in suppressing saturation loss, and when 2,4-diaminophenoxyethanol is blended as component (B) in the first agent, it is more effective in suppressing hue change.

[0201] From the results shown in Table 3, the oxidative hair dyes of Examples 8 and 9 (with (A) / (B) ratios of 0.59 and 1.18) had larger ΔC* values ​​than the oxidative hair dye of Example 10 (with (A) / (B) ratio of 5.88). Therefore, it can be seen that in oxidative hair dyes obtained by mixing at least the first, second, and third agents, an (A) / (B) ratio of less than 5.88 is preferable from the viewpoint of better suppressing loss of saturation. Furthermore, the oxidative hair dye of Example 8 (with (A) / (B) ratio of 0.59) had a smaller hue angle difference (hα) value than the oxidative hair dyes of Examples 9 and 10 (with (A) / (B) ratios of 1.18 and 5.88). Therefore, in an oxidation hair dye obtained by mixing at least the first agent, the second agent, and the third agent, it is found that the mass ratio (A) / (B) is preferably less than 1.18 from the viewpoint of excellent suppression of hue change.

[0202] From the results shown in Table 4, when examining the ΔC* values ​​and the hue angle difference (hα) values ​​for the oxidative hair dyes of Examples 11 to 15 (with (C) / (D) ratios of 1 to 20), it can be seen that the ΔC* values ​​tended to increase as the (C) / (D) ratio increased, and the hue angle difference (hα) values ​​tended to decrease as the (C) / (D) ratio decreased. Therefore, it can be seen that in oxidative hair dyes obtained by mixing at least the first, second, and third agents, the (C) / (D) ratio is preferably 1 or more from the viewpoint of better suppressing saturation loss, and is preferably 20 or less from the viewpoint of better suppressing hue change.

[0203] (Evaluation Results of Examples 16 to 21) The evaluation results of the oxidation hair dyes of Examples 16 to 21 are shown in Tables 6 to 7.

[0204] [Table 6]

[0205] [Table 7]

[0206] From the results shown in Tables 6 and 7, the oxidative hair dyes of Examples 16 to 21 all had larger ΔC* values ​​than the oxidative hair dyes of Comparative Examples 1 to 6 in Tables 1 and 5. Therefore, it can be seen that in oxidative hair dyes obtained by mixing at least the first, second, and third agents, by blending component (A) and component (B) in the first agent and component (C) or component (D) in the third agent, they are excellent at suppressing saturation loss.

[0207] From the results shown in Tables 3, 6 to 7, the oxidative hair dyes of Examples 8 and 22, which do not contain para-aminophenol, tended to have larger ΔC* values ​​and smaller hue angle difference (hα) values ​​compared to the oxidative hair dyes of Examples 21 and 24, which contained para-aminophenol (comparisons between Examples 8 and 21, and between Examples 22 and 24). Therefore, it can be seen that when para-aminophenol is contained in an oxidative hair dye obtained by mixing at least the first, second and third agents, the agent tends to be slightly less effective at suppressing saturation loss and hue change.

[0208] The results shown in Tables 2-3 and Tables 6-7 show that the oxidative hair dyes of Examples 3-6, 8, 20-21, which do not contain 5-aminoorthocresol, all tended to have larger ΔC* values ​​than the oxidative hair dyes of Examples 16-19, 22-24, which contained 5-aminoorthocresol (comparisons between Example 3 and Example 16, Example 4 and Example 17, Example 5 and Example 18, Example 6 and Example 19, Example 8 and Example 22, Example 20 and Example 23, and Example 21 and Example 24). Therefore, it can be seen that when 5-aminoorthocresol is contained in an oxidative hair dye obtained by mixing at least the first, second, and third agents, the suppression of saturation loss tends to be somewhat inferior.

[0209] (Prescription example) An example of an oxidation hair dye formulation is shown below.

[0210] The oxidation hair dye can be obtained by mixing the first agent formulation, the second agent formulation, and either the third agent formulation (1) or the third agent formulation (2) shown below in an appropriate mass ratio (for example, a first agent mass ratio of 0.8:1:0.2).

[0211] (First drug prescription) Paraphenylenediamine 0.2% by mass Resorcinol 0.2% by mass Cetyl alcohol 4.0% by mass Stearyl alcohol 4.0% by mass Product name: Crodafos CES (containing dicetyl phosphate) 1.5% by mass Polyoxyethylene cetyl ether (10E.O.) 3.0% by mass Polyoxyethylene cetyl ether (30E.O.) 1.0% by mass Propylene glycol 1.0% by mass Ammonia water 1.5% by mass Sodium sulfite (anhydrous) 0.2% by mass L-ascorbic acid 0.15% by mass Ethylenediaminehydroxyethyltriacetate trisodium dihydrate 0.2% by mass Fragrance 0.1% by mass Purified water Amount to make up 100% by mass

[0212] (Second drug prescription) Cetyl alcohol 2.4% by mass Stearyl alcohol 1.2% by mass Polyoxyethylene cetyl ether (15E.O.) 1.3% by mass Hydrogen peroxide solution 3% by mass Purified water 92.1% by mass

[0213] (Third drug prescription (1)) 1-Naphthol 0.55% by mass 2,6-diaminopyridine 0.04% by mass Cetyl alcohol 4.0% by mass Stearyl alcohol 4.0% by mass Product name: Crodafos CES (containing dicetyl phosphate) 1.5% by mass Polyoxyethylene cetyl ether (10E.O.) 3.0% by mass Polyoxyethylene cetyl ether (30E.O.) 1.0% by mass Propylene glycol 1.0% by mass Ammonia water 1.5% by mass Sodium sulfite (anhydrous) 0.2% by mass L-ascorbic acid 0.15% by mass Ethylenediaminehydroxyethyltriacetate trisodium dihydrate 0.2% by mass Fragrance 0.1% by mass Purified water Amount to make up 100% by mass

[0214] (Third drug prescription (2)) 1-naphthol 0.04% by mass 2,6-diaminopyridine 0.04% by mass Cetyl alcohol 4.0% by mass Stearyl alcohol 4.0% by mass Product name: Crodafos CES (containing dicetyl phosphate) 1.5% by mass Polyoxyethylene cetyl ether (10E.O.) 3.0% by mass Polyoxyethylene cetyl ether (30E.O.) 1.0% by mass Propylene glycol 1.0% by mass Ammonia water 1.5% by mass Sodium sulfite (anhydrous) 0.2% by mass L-ascorbic acid 0.15% by mass Ethylenediaminehydroxyethyltriacetate trisodium dihydrate 0.2% by mass Fragrance 0.1% by mass Purified water Amount to make up 100% by mass

Claims

1. An oxidation hair dye that is used by mixing a first agent, a second agent, and a third agent, The first agent is (A) one or more selected from the group consisting of paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof; (B) a composition containing resorcinol and one or more selected from 2,4-diaminophenoxyethanol and its salts, The second agent is It contains an oxidizing agent, The third agent is (C) 1-naphthol and (D) one or more selected from 2,6-diaminopyridine are blended. Oxidative hair dye.

2. 2. The oxidative hair dye according to claim 1, wherein the third agent contains (C) 1-naphthol and (D) 2,6-diaminopyridine.

3. 3. The oxidation hair dye according to claim 2, wherein the third agent has a mass ratio of the amount of (C) 1-naphthol to the amount of (D) 2,6-diaminopyridine of 0.5 or more.

4. 3. The oxidation hair dye according to claim 1, wherein the mass ratio ((A) / (B)) of the total amount of (A) paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof, in a non-salt form relative to the total amount of (B) resorcinol, and one or more selected from 2,4-diaminophenoxyethanol or salts thereof, in a non-salt form, is less than 5.

88.

5. 3. The oxidation hair dye according to claim 1, wherein the oxidation hair dye does not contain para-aminophenol or a salt thereof, or the content of para-aminophenol or a salt thereof is 0.2 mass% or less.

6. 3. The oxidation hair dye according to claim 1, wherein the oxidation hair dye does not contain 5-aminoorthocresol or a salt thereof, or the content of 5-aminoorthocresol or a salt thereof is 0.25% by mass or less.

7. The third agent in an oxidation hair dye composition is a mixture of a first agent, a second agent, and a third agent, The first agent is (A) one or more selected from the group consisting of paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof; (B) a composition containing resorcinol and one or more selected from 2,4-diaminophenoxyethanol and its salts, The second agent is It contains an oxidizing agent, The third agent is The third agent in the oxidation hair dye contains one or more selected from (C) 1-naphthol and (D) 2,6-diaminopyridine.

8. An oxidation hair dye kit comprising a first agent, a second agent, and a third agent, The first agent is (A) one or more selected from the group consisting of paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof; (B) a composition containing resorcinol and one or more selected from 2,4-diaminophenoxyethanol and its salts, The second agent is It contains an oxidizing agent, The third agent is An oxidation hair dye kit containing one or more selected from (C) 1-naphthol and (D) 2,6-diaminopyridine.

9. An oxidation hair dye is used by mixing a first agent containing an oxidation dye, a second agent containing an oxidizing agent, and a third agent containing an oxidation dye different from the oxidation dye contained in the first agent, The saturation value C*(I) of hair dyed with a mixed agent (I) obtained by mixing the first agent and the second agent in a mass ratio of the first agent:the second agent=1:1 is measured with a spectrophotometer (measurement mode: SCE measurement), and hair dyed with a mixed agent (II) obtained by mixing the first agent, the second agent, and the third agent in a ratio of the first agent:the second agent:the third agent=0.8:1:0.2 (mass ratio), the saturation value C*(II) measured with a spectrophotometer (measurement mode: SCE measurement), The value of ΔC* calculated from the formula ΔC*=C*(II)-C*(I) is 0 or more; Oxidative hair dye.

10. 10. The oxidative hair dye according to claim 9, hair dyed with a mixed agent (I) obtained by mixing the first agent and the second agent in a first agent:second agent = 1:1 (mass ratio), the hue angle measured with a spectrophotometer (measurement mode: SCE measurement) is defined as h(I); hair dyed with a mixed agent (II) obtained by mixing the first agent, the second agent, and the third agent in a mass ratio of the first agent:the second agent:the third agent=0.8:1:0.2, the hue angle measured with a spectrophotometer (measurement mode: SCE measurement) is defined as h(II); An oxidation hair dye having a hue angle difference (hα) value obtained from the following formulas (2) and (3) of 0 or more and 40 or less. α=|h(I)−h(II)| (2) Hue angle difference (hα) = |α - (360 × N)| (3) (In the above formula (3), the value of α calculated by formula (2) is N=0 when α≦180, and N=1 when α>180.)

11. The first agent contains, as an oxidation dye, (A) one or more selected from paraphenylenediamine, toluene-2,5-diamine, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof; (B) at least one or more selected from resorcinol and 2,4-diaminophenoxyethanol or a salt thereof are blended, The third agent contains, as an oxidation dye, at least one or more selected from (C) 1-naphthol and 2,6-diaminopyridine. The oxidative hair dye according to claim 9 or 10.

12. A hair dyeing method using the oxidative hair dye composition according to claim 1 or 2.

13. A hair dyeing method using the oxidative hair dye composition according to claim 8 or 9.

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