Oxidative hair dye, second agent, kit, and hair dyeing method

Abstract

The present invention provides an oxidative hair dye with excellent uniformity (uniform coloring throughout the hair), and a second agent for the oxidative hair dye. The present invention also provides an oxidative hair dye kit with excellent uniformity, and a hair dyeing method using an oxidative hair dye with excellent uniformity. [Solution] An oxidative hair dye comprising: a first agent containing a specific oxidative dye; and a second agent containing one or more selected from the group consisting of an oxidizing agent, an ester of a fatty acid and a higher alcohol, and polyoxypropylene alkyl ether, polypropylene glycol, and polyoxyethylene alkyl ether with an average addition mole of ethylene oxide of 10 or more. An oxidative hair dye kit comprising the first agent and the second agent. The second agent in the oxidative hair dye. A method for dyeing hair using the oxidative hair dye.

Description

Technical Field

[0001] The present invention relates to an oxidative hair dye, a second agent, a kit, and a hair dyeing method.

Background Art

[0002] The oxidative hair dye used for coloring hair is based on the hair dyeing principle that the oxidative dye penetrated into the hair is dyed by oxidative polymerization, and achieves longer lasting hair color retention compared to other hair coloring agents such as acidic hair dyes.

[0003] As an example of oxidative hair dyes, Patent Document 1 below discloses an oxidative hair dye composed of a first agent containing an alkaline agent excluding carbonates and bicarbonates and an oxidative dye, and a second agent containing an oxidizing agent, wherein para-aminophenol and / or a salt thereof is used as a dye precursor, resorcinol is used as a coupler, and the total amount of para-aminophenol and / or a salt thereof and resorcinol is 70 to 100 mol percent of the total amount of the oxidative dye.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of Invention

Problem to be Solved by the Invention

[0005] Hair dyeing with an oxidative hair dye is often targeted at hair groups where various hair conditions coexist, such as hair damaged by chemical treatments like oxidative hair dyeing treatments and hair straightening treatments, hair damaged by physical treatments such as brushing, and undamaged hair. In general, the damage to hair increases as it approaches the tip portion from the root portion.

[0006] When hair containing strands with varying degrees of damage is dyed with an oxidative hair dye, the hair may be dyed in different shades depending on the degree of damage. Therefore, dyeing hair with an oxidative hair dye on hair containing strands with varying degrees of damage may result in poor uniformity (uniform coloring throughout the hair).

[0007] In hair dyeing using oxidative hair dyes, it is desirable to achieve uniform coloring across the entire hair, regardless of the degree of hair damage. For these reasons, there is a demand for oxidative hair dyes with excellent uniformity.

[0008] The first objective of the present invention is to provide an oxidative hair dye with excellent uniformity. A second objective of the present invention is to provide a second agent in an oxidative hair dye that exhibits excellent uniformity. A third object of the present invention is to provide an oxidative hair dye kit with excellent uniformity. A fourth object of the present invention is to provide a hair dyeing method using an oxidative hair dye that exhibits excellent uniformity. [Means for solving the problem]

[0009] The present inventors, through diligent research, have found that an oxidative hair dye, comprising a first agent containing a specific oxidative dye and a second agent containing one or more selected from the group consisting of an oxidizing agent, an ester of a fatty acid and a higher alcohol, and polyoxypropylene alkyl ether, polypropylene glycol, and polyoxyethylene alkyl ether with an average addition mole of ethylene oxide of 10 or more, exhibits excellent uniform dyeing properties (uniform coloring throughout the hair) when used to dye hair with varying degrees of damage. Based on this finding, the present invention has been completed.

[0010] The present invention includes the following inventions [1] to [8].

[0011] [1] The oxidative hair dye is selected from at least one of the following (A), (B), and (C): (A) One or more selected from paraphenylenediamine or its salts, and 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts, metaaminophenol or its salts, and 5-amino-o-cresol or its salts, (B) One or more selected from toluene-2,5-diamine or its salts, and one or more selected from meta-aminophenol or its salts, 5-amino-o-cresol or its salts, and resorcinol. (C) An oxidative hair dye comprising: a first agent containing one or more selected from para-aminophenol or its salts, and one or more selected from meta-aminophenol or its salts, and 5-amino-o-cresol or its salts; and a second agent containing one or more selected from the group consisting of an oxidizing agent, an ester of a fatty acid and a higher alcohol, and polyoxypropylene alkyl ether, polypropylene glycol, and polyoxyethylene alkyl ether with an average addition mole of ethylene oxide of 10 or more.

[0012] The oxidative hair dye in [2] is the same as the oxidative hair dye in [1], wherein the second agent is an ester of a branched fatty acid and a branched higher alcohol.

[0013] The oxidative hair dye in [3] is the oxidative hair dye in [1] or [2], wherein the second agent is one or more selected from the group consisting of polyoxypropylene alkyl ether, polypropylene glycol, and polyoxyethylene alkyl ether with an average number of added moles of ethylene oxide of 10 or more, and is one or more selected from polyoxypropylene stearyl ether, polypropylene glycol with an average degree of polymerization of 3 or more, and polyoxyethylene alkyl ether with an average number of added moles of ethylene oxide of 20 or more.

[0014] The oxidative hair dye in [4] is selected from any of the oxidative hair dyes in [1] to [3], wherein (A) is one or more selected from paraphenylenediamine or its salt and 2,2'-[(4-aminophenyl)imino]bisethanol or its salt, and one or more selected from 2,4-diaminophenoxyethanol or its salt and 5-amino-o-cresol or its salt; (B) is one or more selected from toluene-2,5-diamine or its salt, and one or more selected from meta-aminophenol or its salt and resorcinol; or (C) is one or more selected from para-aminophenol or its salt, and one or more selected from meta-aminophenol or its salt.

[0015] The oxidative hair dye in [5] is one of the oxidative hair dyes in [1] to [4], where (A) is at least one of the following (A4) and (A6). (A4) One or more selected from 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts. (A6) One or more selected from 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 5-amino-o-cresol or its salts.

[0016] [6] The second agent is at least one of the following (A), (B), and (C): (A) one or more selected from paraphenylenediamine or its salts and 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts, metaaminophenol or its salts, and 5-amino-o-cresol or its salts; (B) one or more selected from toluene-2,5-diamine or its salts, and metaaminophenol or its salts, 5-amino-o-cresol or its salts, and resorcinol The second agent in an oxidative hair dye uses a first agent containing one or more selected from (C) para-aminophenol or its salts, and one or more selected from meta-aminophenol or its salts, and 5-amino-o-cresol or its salts, and an oxidizing agent, and contains one or more selected from the group of esters of fatty acids and higher alcohols, and polyoxypropylene alkyl ethers, polypropylene glycol, and polyoxyethylene alkyl ethers with an average addition mole of ethylene oxide of 10 or more.

[0017] The oxidation hair dye kit of [7] comprises a first agent containing at least one selected from the following (A), (B), and (C): (A) one or more selected from p-phenylenediamine or a salt thereof, and 2,2'-[(4-aminophenyl)imino]bisethanol or a salt thereof, as well as one or more selected from 2,4-diaminophenoxyethanol or a salt thereof, m-aminophenol or a salt thereof, and 5-amino-o-cresol or a salt thereof; (B) one or more selected from toluene-2,5-diamine or a salt thereof, as well as one or more selected from m-aminophenol or a salt thereof, 5-amino-o-cresol or a salt thereof, and resorcinol; (C) one or more selected from p-aminophenol or a salt thereof, as well as one or more selected from m-aminophenol or a salt thereof, and 5-amino-o-cresol or a salt thereof; and a second agent containing an oxidizing agent, an ester of a fatty acid and a higher alcohol, as well as one or more selected from the group consisting of polyoxypropylene alkyl ether, polypropylene glycol, and polyoxyethylene alkyl ether with an average added mole number of ethylene oxide of 10 or more.

[0018] The hair dyeing method of [8] is a hair dyeing method using any of the oxidation hair dyes of [1] to [5]. [Effects of the Invention]

[0019] According to the oxidation hair dye of the present invention, an oxidation hair dye with excellent leveling property can be provided. According to the second agent of the present invention, the second agent for an oxidation hair dye with excellent leveling property can be provided. According to the oxidation hair dye kit of the present invention, an oxidation hair dye kit for an oxidation hair dye with excellent leveling property can be provided. According to the hair dyeing method of the present invention, a hair dyeing method using an oxidation hair dye with excellent leveling property can be provided. [Modes for Carrying Out the Invention]

[0020] The present invention is described below based on the embodiments of the present invention.

[0021] <Oxidative hair dye> The oxidative hair dye of this embodiment is At least one of the following (A), (B), or (C): (A) One or more selected from paraphenylenediamine or its salts, and 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts, metaaminophenol or its salts, and 5-amino-o-cresol or its salts, (B) One or more selected from toluene-2,5-diamine or its salts, and one or more selected from meta-aminophenol or its salts, 5-amino-o-cresol or its salts, and resorcinol. (C) One or more selected from para-aminophenol or its salts, and one or more selected from meta-aminophenol or its salts, and 5-amino-o-cresol or its salts. The first agent contains the following ingredients: Oxidizing agent, Esters of fatty acids and higher alcohols, and, A second agent comprising one or more selected from the group consisting of polyoxypropylene alkyl ether, polypropylene glycol, and polyoxyethylene alkyl ether with an average addition mole of ethylene oxide of 10 or more, This was used.

[0022] The oxidative hair dye of this embodiment, due to its above-described configuration, exhibits excellent uniform dyeing properties (uniform coloring throughout the entire hair). The oxidative hair dye of this embodiment makes it possible to achieve more uniform coloring throughout the entire scalp, including hair with varying degrees of damage, and also in the root and tip sections of the hair, which have different degrees of damage.

[0023] In the following description, the first and second agents of the oxidative hair dye of this embodiment may be referred to as "the first agent of this embodiment" and "the second agent of this embodiment," respectively. Furthermore, polyoxypropylene alkyl ethers, polypropylene glycols, and polyoxyethylene alkyl ethers with an average addition mole of ethylene oxide of 10 or more that relate to the second agent of this embodiment may be collectively referred to as "polyoxypropylene alkyl ethers, etc."

[0024] By using the first agent and the second agent of this embodiment by appropriate means, an oxidative hair dye is obtained which contains an oxidative dye containing at least one of (A) to (C), an oxidizing agent, an ester of a fatty acid and a higher alcohol, and one or more selected from the group such as polyoxypropylene alkyl ether. For example, an oxidative hair dye may be obtained by mixing (stirring, shaking, etc.) the first agent and the second agent of this embodiment in appropriate amounts. The oxidative hair dye of this embodiment may be an oxidative hair dye obtained by mixing the first agent and the second agent of this embodiment.

[0025] The oxidative hair dye of this embodiment is not particularly limited, but may be, for example, a two-part oxidative hair dye. Alternatively, the oxidative hair dye of this embodiment may be a three-part or more oxidative hair dye using, for example, the first agent of this embodiment, the second agent of this embodiment, and one or more other agents. The other agents may be agents that appropriately contain components used in oxidative hair dyes or hair bleaching agents. The other agents may be known agents used together with the first and second agents of oxidative hair dyes or hair bleaching agents.

[0026] [First agent] The first agent of this embodiment is at least one selected from (A), (B), and (C) below. (A) One or more selected from paraphenylenediamine or its salts, and 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts, metaaminophenol or its salts, and 5-amino-o-cresol or its salts, (B) One or more selected from toluene-2,5-diamine or its salts, and one or more selected from meta-aminophenol or its salts, 5-amino-o-cresol or its salts, and resorcinol. (C) A compound comprising one or more selected from para-aminophenol or its salts, and one or more selected from meta-aminophenol or its salts, and 5-amino-o-cresol or its salts.

[0027] Furthermore, paraphenylenediamine or its salts, 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, 2,4-diaminophenoxyethanol or its salts, metaaminophenol or its salts, 5-amino-o-cresol or its salts, toluene-2,5-diamine or its salts, resorcinol, paraaminophenol or its salts are all oxidation dyes.

[0028] The first agent of this embodiment may contain only (A), only (B), or only (C), or it may contain (A) and (B), (A) and (C), or (B) and (C), or it may contain (A), (B), and (C). Furthermore, the first agent of this embodiment may contain one or more oxidation dyes other than the oxidation dyes related to (A), (B), and (C), as long as at least one selected from (A), (B), and (C) is included. In the following description, oxidation dyes other than the oxidation dyes related to (A), (B), and (C) may be referred to as "other oxidation dyes".

[0029] ((A)) The first agent of this embodiment may be a mixture of at least (A) paraphenylenediamine or a salt thereof, and one or more selected from 2,2'-[(4-aminophenyl)imino]bisethanol or a salt thereof, and one or more selected from 2,4-diaminophenoxyethanol or a salt thereof, meta-aminophenol or a salt thereof, and 5-amino-o-cresol or a salt thereof.

[0030] Examples of paraphenylenediamine or its salts include paraphenylenediamine, paraphenylenediamine hydrochloride, and paraphenylenediamine sulfate. Examples of 2,2'-[(4-aminophenyl)imino]bisethanol or its salts include 2,2'-[(4-aminophenyl)imino]bisethanol and 2,2'-[(4-aminophenyl)imino]bisethanol sulfate. Examples of 2,4-diaminophenoxyethanol or its salts include 2,4-diaminophenoxyethanol and 2,4-diaminophenoxyethanol hydrochloride. Examples of metaaminophenol or its salts include metaaminophenol and metaaminophenol sulfate. Examples of 5-amino-o-cresol or its salts include 5-amino-o-cresol and 5-amino-o-cresol sulfate.

[0031] The first agent of this embodiment may be a compound containing, for example, one or more selected from the group consisting of paraphenylenediamine, paraphenylenediamine hydrochloride, paraphenylenediamine sulfate, 2,2'-[(4-aminophenyl)imino]bisethanol, and 2,2'-[(4-aminophenyl)imino]bisethanol sulfate, and one or more selected from the group consisting of 2,4-diaminophenoxyethanol, 2,4-diaminophenoxyethanol hydrochloride, metaaminophenol, metaaminophenol sulfate, 5-amino-o-cresol, and 5-amino-o-cresol sulfate.

[0032] The first agent of this embodiment may contain, for example, at least one of the following (A1) to (A6) as (A). (A1) One or more selected from paraphenylenediamine or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts (A2) One or more selected from paraphenylenediamine or its salts, and one or more selected from meta-aminophenol or its salts (A3) One or more selected from paraphenylenediamine or its salts, and one or more selected from 5-amino-o-cresol or its salts (A4) One or more selected from 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts. (A5) One or more selected from 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from metaaminophenol or its salts. (A6) One or more selected from 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 5-amino-o-cresol or its salts.

[0033] In the first agent of this embodiment, when at least (A) is included, from the viewpoint of superior uniformity, (A) is preferably (A1), (A2), (A3), (A4), or (A6) as described above, more preferably (A1), (A3), (A4), or (A6) as described above, even more preferably (A1), (A4), or (A6) as described above, particularly preferably (A4) or (A6) as described above, and most preferably (A6) as described above.

[0034] ((B)) The first agent of this embodiment may contain at least one selected from (B)toluene-2,5-diamine or a salt thereof, and one or more selected from metaaminophenol or a salt thereof, 5-amino-o-cresol or a salt thereof, and resorcinol.

[0035] Examples of toluene-2,5-diamine or its salts include toluene-2,5-diamine hydrochloride, and toluene-2,5-diamine sulfate. The same meta-aminophenol or its salt, and 5-amino-o-cresol or its salt can be used as described above. Resorcinol is benzene-1,3-diol (also known as resorcinol) represented by the structural formula C6H4(OH)2.

[0036] The first agent of this embodiment may be a mixture of (B) one or more selected from the group consisting of toluene-2,5-diamine, toluene-2,5-diamine hydrochloride, and toluene-2,5-diamine sulfate, and one or more selected from the group consisting of meta-aminophenol, meta-aminophenol sulfate, 5-amino-o-cresol, 5-amino-o-cresol sulfate, and resorcinol.

[0037] The first agent of this embodiment may contain, for example, at least one of the following (B1) to (B3) as (B). (B1) One or more selected from toluene-2,5-diamine or its salts, and one or more selected from meta-aminophenol or its salts. (B2) One or more selected from toluene-2,5-diamine or its salts, and one or more selected from 5-amino-o-cresol or its salts. (B3) One or more selected from toluene-2,5-diamine or its salts, and resorcinol

[0038] In the first agent of this embodiment, when at least (B) is included, from the viewpoint of superior uniformity, (B) is preferably (B1) or (B2) as described above, and (B1) is more preferred.

[0039] ((C)) The first agent of this embodiment may be a compound comprising at least one selected from (C) para-aminophenol or its salts, and one or more selected from meta-aminophenol or its salts, and 5-amino-o-cresol or its salts.

[0040] Examples of para-aminophenol or its salts include para-aminophenol and para-aminophenol sulfate. The same meta-aminophenol or its salts, and 5-amino-o-cresol or its salts can be used as described above.

[0041] The first agent of this embodiment may be a mixture of (C) one or more selected from, for example, para-aminophenol and para-aminophenol sulfate, and one or more selected from the group consisting of meta-aminophenol, meta-aminophenol sulfate, 5-amino-o-cresol, and 5-amino-o-cresol sulfate.

[0042] The first agent of this embodiment may contain, for example, at least one of the following (C1) or (C2) as (C). (C1) One or more selected from para-aminophenol or its salts, and one or more selected from meta-aminophenol or its salts. (C2) One or more selected from para-aminophenol or its salts, and one or more selected from 5-amino-o-cresol or its salts.

[0043] In the first agent of this embodiment, when at least (C) is included, (C1) described above is preferred as (C) from the viewpoint of superior uniformity.

[0044] In this embodiment, the first agent is preferably (A) is (A1) above, (B) is (B1) above, or (C) is (C1) above, more preferably (A) is (A2) above, (B) is (B1) above, or (C) is (C1) above, even more preferably (A) is (A3) above, (B) is (B1) above, or (C) is (C1) above, and even more preferably (A) is (A4) above, (B) is (B1) above, or (C) is (C1) above.

[0045] The first agent of this embodiment is preferably selected from (A), (B), and (C) in the order of (A6), (B3), (A4), (C1), (C2), (A1), (A3), (A2), (B1), (A5), and (B2) above, from the viewpoint of superior uniformity of staining.

[0046] (Other oxidative dyes) Other oxidative dyes include, for example, paramethylaminophenol or its salts (paramethylaminophenol, paramethylaminophenol sulfate, etc.), orthochlorparaphenylenediamine or its salts (orthochlorparaphenylenediamine sulfate, etc.), orthaminophenol or its salts (orthaminophenol, orthaminophenol sulfate, etc.), 1-hydroxyethyl-4,5-diaminopyrazole or its salts (1-hydroxyethyl-4,5-diaminopyrazole sulfate, etc.), 2-methylresorcinol, 4-chlororesorcinol, 2-chlororesorcinol, metaphenylenediamine or its salts (metaphenylenediamine, metaphenylenediamine hydrochloride, etc.), 2,6-diaminopyridine, 5-(2-hydroxyethylamino)-2-methylphenol, and α-naphthol.

[0047] (Amount of oxidative dyes used) The amount of oxidative dye in the first agent of this embodiment (referring to the total amount of (A), (B), (C), and other oxidative dyes blended in the first agent of this embodiment; the same applies hereinafter) is, for example, 0.01% by mass or more, but from the viewpoint of being able to dye the hair more intensely, 0.1% by mass or more is preferred, 0.2% by mass or more is more preferred, and 0.3% by mass or more is even more preferred.

[0048] The amount of oxidative dye in the first agent of this embodiment is, for example, 10% by mass or less, but from the viewpoint of being able to dye the hair to a highly saturated color, 5% by mass or less is preferred, 4% by mass or less is more preferred, and 3% by mass or less is even more preferred.

[0049] The range of the amount of oxidative dye in the first agent of this embodiment is, for example, 0.01% by mass or more and 10% by mass or less, but from the above viewpoint, 0.1% by mass or more and 5% by mass or less is preferred, 0.2% by mass or more and 4% by mass or less is more preferred, and 0.3% by mass or more and 3% by mass or less is even more preferred.

[0050] ([Total amount of (A), (B), and (C) / Amount of oxidative dye] ratio) The first agent of this embodiment may have a mass ratio ([total amount of (A), (B), and (C) / amount of oxidative dye] ratio) of the total amount of (A), (B), and (C) in the first agent of this embodiment to the amount of oxidative dye in the first agent of this embodiment, which may be, for example, 0.3 or more, 0.4 or more, 0.5 or more, 0.6 or more, 0.7 or more, 0.8 or more, 0.9 or more, 0.95 or more, or 1.

[0051] The first agent of this embodiment may not contain any other oxidation dyes, or it may contain other oxidation dyes in an amount of 1% by mass or less, 0.5% by mass or less, 0.3% by mass or less, 0.1% by mass or less, or 0.05% by mass or less.

[0052] (Optional components of the first agent) The first agent of this embodiment may contain other components besides the oxidative dyes described above (hereinafter referred to as "optional components of the first agent") as appropriate. The optional components of the first agent can be appropriately selected from known components used in oxidative hair dyes, and examples include alkalis, water, surfactants, higher alcohols, polyhydric alcohols, lower alcohols, hydrocarbons, oils and fats, ester oils, silicones, antioxidants, chelating agents, and fragrances.

[0053] (alkali) The first agent of this embodiment may contain one or more alkalis. The alkalis promote the decomposition of the oxidizing agent contained in the second agent of this embodiment and enhance the penetration of the oxidative dye into the hair, thereby improving the hair dyeing performance of the oxidative hair dye.

[0054] Examples of alkalis in the first agent of this 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 (sodium phosphate, etc.), and ammonium salts (ammonium carbonate, ammonium bicarbonate, ammonium sulfate, etc.).

[0055] The amount of alkali in the first agent of this embodiment is not particularly limited and may be set as appropriate.

[0056] The amount of alkali in the first agent of this embodiment is, for example, 0.1% by mass or more, but from the viewpoint of being able to dye the hair more intensely, 0.5% by mass or more is preferred, 0.8% by mass or more is more preferred, and 1% by mass or more is even more preferred.

[0057] The amount of alkali in the first agent of this embodiment is, for example, 15% 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 8% by mass or less, and even more preferably 7% by mass or less. When ammonia water is added as alkali to the first agent of this embodiment, from the viewpoint of reducing the risk of hair damage, the amount of ammonia water added is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 2.5% by mass or less.

[0058] The range of alkali content in the first agent of this embodiment is, for example, 0.1% by mass or more and 10% by mass or less, but from the above viewpoint, 0.5% by mass or more and 5% by mass or less is preferred, 0.8% by mass or more and 3% by mass or less is more preferred, and 1% by mass or more and 2.5% by mass or less is even more preferred. When aqueous ammonia is added as alkali to the first agent of this embodiment, the range of aqueous ammonia content is, from the above viewpoint, 0.1% by mass or more and 5% by mass or less, 0.5% by mass or more and 3% by mass or less is more preferred, and 0.8% by mass or more and 2.5% by mass or less is even more preferred.

[0059] (water) The first agent of this embodiment may contain water. For example, the amount of water in the first agent of this embodiment is 30% by mass or more and 80% by mass or less.

[0060] (Surfactants) The first agent of this embodiment may, for example, contain one or more surfactants. As the surfactant, for example, known surfactants used in hair compositions may be used. As the surfactant, anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants may be used.

[0061] Examples of anionic surfactants include carboxylic acid-based anionic surfactants (polyoxyethylene alkyl ether carboxylic acid or its salt, fatty acid amide ether carboxylic acid or its salt, fatty acid amide ether carboxylic acid or its salt, N-acyl amino acid or its salt, acyl sarcosine or its salt, acyl lactic acid or its salt, higher fatty acid salts, etc.), sulfonic acid-based anionic surfactants (α-olefin sulfonic acid or its salt, alkane sulfonic acid or its salt, α-sulfo fatty acid methyl ester or its salt, acyl isethionic acid or its salt, alkyl glycidyl ether sulfonic acid or its salt, alkyl sulfosuccinic acid or its salt, alkyl sulfoacetic acid or its salt, alkylbenzene sulfone Examples include acids or their salts, alkylnaphthalene sulfonic acid or its salts, acylmethyl taurine or its salts, acyl isethionic acid or its salts, etc., sulfate-based anionic surfactants (alkyl sulfate or its salts, alkyl ether sulfate or its salts, polyoxyethylene alkyl ether sulfate or its salts, alkylaryl ether sulfate or its salts, polyoxyethylene fatty acid amide ether sulfate or its salts, fatty acid alkanolamide sulfate or its salts, fatty acid monoglyceride sulfate or its salts, etc.), and phosphate-based anionic surfactants (alkyl phosphoric acid or its salts, alkyl ether phosphoric acid or its salts, alkylaryl ether phosphoric acid or its salts, fatty acid amide ether phosphoric acid or its salts, etc.).

[0062] Examples of cationic surfactants include quaternary ammonium salts (e.g., mono-long-chain alkyltrimethylammonium salts (cetyltrimethylammonium salt, stearyltrimethylammonium salt, behenyltrimethylammonium salt, etc.), di-long-chain alkyldimethylammonium salts (dicetyldimethylammonium salt, distearyldimethylammonium salt, etc.), tri-long-chain alkylmonomethylammonium salt, benzalkonium-type quaternary ammonium salt, mono-alkyl ether-type quaternary ammonium salt, mono-alkylamide-type quaternary ammonium salt), and tertiary amine salts (e.g., fatty acid ester amine salts, fatty acid amide amine salts, urea condensation amine salt-type tertiary amine salts (Arcobel-type tertiary amine salts)). Note that the above "long-chain alkyl" may be an alkyl group having 12 to 28 carbon atoms.

[0063] Examples of nonionic surfactants include polyoxyethylene alkyl ethers, polyoxyethylene alkylene ethers, polyoxyethylene alkylphenyl ethers, polyoxypropylene alkyl ethers, polyoxypropylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, glycerin fatty acid esters, polyglycerin fatty acid esters, polyethylene glycol derivatives of monoglycerides and diglycerides obtained from vegetable oils, polyoxyethylene glycerin fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene phytosterols, sucrose fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, alkyl glucosides, and alkyl polyglucosides.

[0064] The amount of surfactant in the first agent of this embodiment is, for example, 0.1% by mass or more and 10% by mass or less.

[0065] (High-grade alcohol) The first agent of this embodiment may, for example, contain one or more higher alcohols. As the higher alcohol, monohydric alcohols having 12 to 24 carbon atoms may be used, for example, myristyl alcohol, cetanol, oleyl alcohol, stearyl alcohol, arachidyl alcohol, behenyl alcohol, hexyldecanol, isocetyl alcohol, isostearyl alcohol, octyldodecanol, and decyltetradecanol. The amount of higher alcohols having 12 to 24 carbon atoms in the first agent of this embodiment is, for example, 2% by mass or more and 15% by mass or less.

[0066] (Polyhydric alcohol) The first agent of this embodiment may, for example, contain one or more polyhydric alcohols. Examples of polyhydric alcohols include polyhydric alcohols having 2 to 8 carbon atoms (e.g., ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, glycerin, diglycerin, and butylene glycol). The amount of polyhydric alcohol in the first agent of this embodiment is, for example, 0.1% by mass or more and 10% by mass or less.

[0067] (viscosity) The viscosity of the first agent in this embodiment is set as appropriate, but for example, it is 100,000 mPa·s or less. Here, the viscosity of the first agent in this embodiment is adopted as the value obtained after 60 seconds at 25°C using a B-type viscometer with a rotor selected according to the viscosity. The rotation speed of the rotor during measurement is, for example, 12 rpm.

[0068] (pH) The pH of the first agent in this embodiment is, for example, 7.5 or higher, but from the viewpoint of achieving a darker hair color, 8.0 or higher is preferred, and 8.5 or higher is more preferred. In this specification, the pH is measured at 25°C using a known pH meter.

[0069] The pH of the first agent in this embodiment is, for example, 13 or less, but from the viewpoint of reducing the risk of hair damage, it is preferably 12 or less, and more preferably 11 or less.

[0070] The pH range of the first agent in this embodiment is, for example, 7.5 to 13, but from the above viewpoint, 8.0 to 12 is preferred, and 8.5 to 11 is more preferred.

[0071] (Alkalinity) The alkalinity of the first agent in this embodiment is, for example, 0.5 to 20.0. Here, "alkalinity" refers to the volume of 0.1 mol / L hydrochloric acid required to neutralize 1 g of the first agent (unit of alkalinity: mL).

[0072] (Dosage form) The dosage form of the first agent in this embodiment may be set as appropriate. Examples of dosage forms include cream, liquid, gel, and powder.

[0073] The first agent of this embodiment may be a cream-like dosage form containing, for example, water, a surfactant (for example, one or more selected from anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants), and a higher alcohol. When the first agent of this embodiment is a cream-like dosage form, the viscosity of the first agent of this embodiment is, for example, 10,000 mPa·s or more and 100,000 mPa·s or less.

[0074] The first agent of this embodiment may be, for example, a powder formulation containing sodium silicate or sodium metasilicate as an alkali, and further containing a persulfate (such as ammonium persulfate, potassium persulfate, or sodium persulfate).

[0075] (Manufacturing method) The method for producing the first agent in this embodiment is not particularly limited, and depending on the dosage form and components of the first agent, a method for producing the first agent used for known oxidative hair dyes may be used. For example, it may be produced by mixing at least one of the above-mentioned (A) to (C) with any component of the first agent as appropriate, as needed, using a conventional method.

[0076] [Second drug] The second agent of this embodiment is a compound comprising an oxidizing agent, an ester of a fatty acid and a higher alcohol, and one or more selected from the group consisting of polyoxypropylene alkyl ethers, polypropylene glycols, and polyoxyethylene alkyl ethers with an average addition mole of ethylene oxide of 10 or more.

[0077] (Oxidizing agent) The second agent of this embodiment may contain one or more oxidizing agents. When the oxidizing hair dye of this embodiment is an oxidizing hair dye, the oxidizing agents promote the oxidative polymerization of the oxidizing dye and improve the hair dyeing performance.

[0078] Examples of oxidizing agents include hydrogen peroxide, bromates, percarbonates, and perborates.

[0079] The amount of oxidizing agent in the second agent of this embodiment is not particularly limited and may be set as appropriate.

[0080] The amount of oxidizing agent in the second agent of this embodiment is, for example, 0.01% by mass or more, but from the viewpoint of being able to dye the hair more densely, 0.5% by mass or more is preferred, 0.8% by mass or more is more preferred, and 1% by mass or more is even more preferred.

[0081] The amount of oxidizing agent in the second agent of this embodiment is, for example, 12% by mass or less, but from the viewpoint of reducing the risk of hair damage, it is preferably 8% by mass or less, more preferably 6% by mass or less, and even more preferably 3% by mass or less.

[0082] The amount of oxidizing agent in the second agent of this embodiment is, for example, 0.01% by mass or more and 12% by mass or less, but from the above viewpoint, 0.5% by mass or more and 8% by mass or less is preferred, 0.8% by mass or more and 6% by mass or less is more preferred, and 1% by mass or more and 3% by mass or less is even more preferred.

[0083] (Esters of fatty acids and higher alcohols) The second agent of this embodiment may be a mixture of one or more esters of fatty acids and higher alcohols. As the ester of fatty acids and higher alcohols, an ester of a straight-chain fatty acid or branched fatty acid and a monohydric straight-chain alcohol or branched alcohol may be used. Examples of the straight-chain fatty acid or branched fatty acid include straight-chain fatty acids or branched fatty acids having 6 to 24 carbon atoms, and the carbon chain of the fatty acid may have a hydroxyl group. The straight-chain fatty acid having 6 to 24 carbon atoms may be saturated or unsaturated.

[0084] Examples of esters between fatty acids and higher alcohols include esters between straight-chain fatty acids and monohydric straight-chain alcohols, esters between straight-chain fatty acids and monohydric branched alcohols, esters between branched fatty acids and monohydric straight-chain alcohols, and esters between branched fatty acids and monohydric branched alcohols.

[0085] Examples of esters of linear fatty acids and monohydric linear alcohols include cetyl caprylate, hexyl laurate, decyl myristate, myristyl myristate, cetyl myristate, cetyl palmitate, stearyl stearate, ethyl oleate, decyl oleate, and oleyl oleate.

[0086] Examples of esters of straight-chain fatty acids with monohydric branched alcohols include isopropyl myristate, isopropyl palmitate, isopropyl linoleate, isostearyl laurate, isotridecyl myristate, 2-hexyldecyl myristate, isostearyl myristate, 2-octyldodecyl myristate, 2-ethylhexyl palmitate, 2-hexyldecyl palmitate, isostearyl palmitate, 2-ethylhexyl stearate, 2-hexyldecyl stearate, isodecyl oleate, 2-octyldodecyl oleate, and 2-octyldodecyl ricinoleate.

[0087] Examples of esters of branched fatty acids and monohydric linear alcohols include ethyl isostearate, cetyl 2-ethylhexanoate, cetostearyl 2-ethylhexanoate, stearyl 2-ethylhexanoate, and hexyl isostearate.

[0088] Examples of esters of branched fatty acids and monohydric branched alcohols include isopropyl isostearate, isopropyl isostearate, 2-octyldodecyl neopentanoate, 2-hexyldecyl 2-ethylhexanoate, isostearyl 2-ethylhexanoate, 2-ethylhexyl isononanoate, isononyl isononanoate, 2-hexyldecyl dimethyloctanoate, 2-octyldodecyl dimethyloctanoate, 2-ethylhexyl isopalmitate, 2-hexyldecyl isostearate, isostearyl isostearate, and 2-octyldodecyl isostearate.

[0089] The second agent of this embodiment may be an ester of a fatty acid and a higher alcohol that is liquid at 25°C, or an ester of a fatty acid and a higher alcohol that is solid at 25°C. Note that an ester of a fatty acid and a higher alcohol that is liquid at 25°C means an ester of a fatty acid and a higher alcohol that exhibits fluidity at 25°C, and may, for example, be an ester of a fatty acid and a higher alcohol with a melting point of 20°C or lower. Furthermore, an ester of a fatty acid and a higher alcohol that is solid at 25°C means an ester of a fatty acid and a higher alcohol that does not exhibit fluidity at 25°C, and may, for example, be an ester of a fatty acid and a higher alcohol with a melting point of 30°C or higher.

[0090] In this embodiment, the second agent is preferably an ester of a fatty acid and a higher alcohol that is liquid at 25°C, from the viewpoint of making the hair softer to the touch after being treated with the oxidative hair dye of this embodiment.

[0091] In this embodiment, the second agent is preferably formulated with an ester of a branched fatty acid and a monohydric branched alcohol as the ester of a fatty acid and a higher alcohol, from the viewpoint that the hair treated with the oxidative hair dye of this embodiment will have a moist, oily feel.

[0092] The amount of ester between a fatty acid and a higher alcohol in the second agent of this embodiment is not particularly limited and may be set as appropriate.

[0093] The amount of ester between a fatty acid and a higher alcohol in the second agent of this embodiment is, for example, 0.1% by mass or more, but from the viewpoint of making the hair softer to the touch after treatment with the oxidative hair dye of this embodiment, 0.3% by mass or more is preferred, 0.5% by mass or more is more preferred, and 1% by mass or more is even more preferred.

[0094] The amount of ester between a fatty acid and a higher alcohol in the second agent of this embodiment is, for example, 20% by mass or less, but from the viewpoint of suppressing an increase in the viscosity of the second agent, it is preferably 10% by mass or less, more preferably 8% by mass or less, and even more preferably 5% by mass or less.

[0095] The range of the amount of ester between a fatty acid and a higher alcohol in the second agent of this embodiment is, for example, 0.1% by mass or more and 20% by mass or less, but from the above viewpoint, 0.3% by mass or more and 10% by mass or less is preferred, 0.5% by mass or more and 8% by mass or less is more preferred, and 1% by mass or more and 5% by mass or less is even more preferred.

[0096] ([Fatty acid and higher alcohol ester / oxidizing agent] ratio) The mass ratio of the ester of fatty acid and higher alcohol to the amount of oxidizing agent in the second agent of this embodiment ([fatty acid and higher alcohol ester / oxidizing agent] ratio) is not particularly limited and may be set as appropriate. For example, it may be 0.01 or more and 50 or less, 0.1 or more and 20 or less, or 1 or more and 10 or less.

[0097] (e.g., polyoxypropylene alkyl ethers) The second agent of this embodiment is a compound containing one or more selected from the group consisting of polyoxypropylene alkyl ether, polypropylene glycol, and polyoxyethylene alkyl ether (polyoxypropylene alkyl ether, etc.) with an average addition mole of ethylene oxide of 10 or more. The second agent of this embodiment may contain only one of the following as the one or more selected from the group consisting of polyoxypropylene alkyl ether, etc.: polyoxypropylene alkyl ether, polypropylene glycol, or polyoxyethylene alkyl ether with an average addition mole of ethylene oxide of 10 or more; it may contain any two of these; or it may contain all three of these.

[0098] (Polyoxypropylene alkyl ether) The second agent of this embodiment may be one or more polyoxypropylene alkyl ethers selected from the group including polyoxypropylene alkyl ethers, and may contain one or more polyoxypropylene alkyl ethers. Polyoxypropylene alkyl ethers are obtained by addition polymerization of propylene oxide to a monohydric alcohol.

[0099] For example, the polyoxypropylene alkyl ether may be represented by the following formula (1). R a -(OCH(CH3)CH2) x -OH (1) (In the above formula (1), R a x represents a hydrocarbon group having 4 to 24 carbon atoms. This hydrocarbon group may be linear or branched, and may be saturated or unsaturated. x represents the average number of moles of propylene oxide added, where x > 0. x may be, for example, 1 to 200, 5 to 15, or 10 to 60.

[0100] As the polyoxypropylene alkyl ether, for example, a polyoxypropylene alkyl ether having a hydrocarbon group with 4 to 24 carbon atoms and an average number of added propylene oxide moles of 1 to 50 may be used.

[0101] Furthermore, the polyoxypropylene alkyl ether may be, for example, polyoxypropylene stearyl ether. The polyoxypropylene stearyl ether may have an average number of moles of propylene oxide added of 1 to 50, or 10 to 30.

[0102] Examples of polyoxypropylene alkyl ethers include polyoxypropylene methyl ether, polyoxypropylene ethyl ether, polyoxypropylene propyl ether, polyoxypropylene butyl ether, polyoxypropylene caprylyl ether, polyoxypropylene lauryl ether, polyoxypropylene myristyl ether, polyoxypropylene cetyl ether, polyoxypropylene stearyl ether, polyoxypropylene cetostearyl ether, polyoxypropylene behenyl ether, polyoxypropylene oleyl ether, polyoxypropylene isostearyl ether, polyoxypropylene lanolyl ether, or polyoxypropylene phytosterol ether, in which the average number of added moles of propylene oxide is 1 or more and 50 or less.

[0103] Examples of polyoxypropylene alkyl ethers include PPG-2 methyl ether, PPG-3 methyl ether, PPG-4 methyl ether, PPG-2 propyl ether, PPG-2 butyl ether, PPG-3 butyl ether, PPG-4 butyl ether, PPG-5 butyl ether, PPG-9 butyl ether, PPG-12 butyl ether, PPG-14 butyl ether, PPG-15 butyl ether, PPG-16 butyl ether, PPG-17 butyl ether, PPG-18 butyl ether, PPG-20 butyl ether, PPG-22 butyl ether, PPG-24 butyl ether, PPG-26 butyl ether, PPG-30 butyl ether, PPG-33 butyl ether, PPG-40 butyl ether, PPG Examples include PPG-52 butyl ether, PPG-53 butyl ether, PPG-90 butyl ether, PPG-120 butyl ether, PPG-3 caprylyl ether, PPG-4 caprylyl ether, PPG-5 caprylyl ether, PPG-6 caprylyl ether, PPG-10 caprylyl ether, PPG-10 lauryl ether, PPG-3 myristyl ether, PPG-10 cetyl ether, PPG-20 cetyl ether, PPG-50 cetyl ether, PPG-11 stearyl ether, PPG-15 stearyl ether, PPG-10 lanolyl ether, PPG-20 lanolyl ether, PPG-2 lanolyl ether, PPG-30 lanolyl ether, PPG-5 lanolyl ether, and PPG-5 phytosterol ether. Note that "PPG" is an abbreviation for polyoxypropylene, and the number after "-" represents the average number of moles of propylene oxide added.

[0104] (Polypropylene glycol) The second agent of this embodiment may be one or more polypropylene glycols selected from the group including polyoxypropylene alkyl ethers. Polypropylene glycol is a polymer of propylene oxide.

[0105] Polypropylene glycol may be represented, for example, by the following formula (2). H(OCH2CH(CH3))y OH (2) (In equation (2) above, y represents the average degree of polymerization of propylene oxide, and y > 2 (for example, y ≥ 3).)

[0106] For example, the average degree of polymerization of propylene oxide in polypropylene glycol may be 3 to 100, 3 to 60, or 3 to 45. However, from the viewpoint of superior uniformity, the average degree of polymerization of propylene oxide in polypropylene glycol is preferably 5 to 40, and more preferably 7 to 20.

[0107] As the polypropylene glycol, for example, one with a number-average molecular weight of 200 or more can be used. The number-average molecular weight of the polypropylene glycol may be, for example, 200 to 5000, 300 to 4000, 300 to 3000, or 350 to 2000. The number-average molecular weight of polypropylene glycol can be determined by a conventional method from the hydroxyl value of the polypropylene glycol.

[0108] Examples of polypropylene glycol include PPG-3, PPG-6, PPG-7, PPG-9, PPG-12, PPG-13, PPG-15, PPG-16, PPG-17, PPG-20, PPG-26, PPG-30, PPG-33, PPG-34, PPG-51, and PPG-69. Here, PPG is an abbreviation for polypropylene glycol, and the "-" followed by the number represents the average degree of polymerization of propylene oxide.

[0109] (Polyoxyethylene alkyl ethers with an average number of moles of ethylene oxide added of 10 or more) The second agent of this embodiment may be one or more selected from the group including polyoxypropylene alkyl ethers, and may contain one or more polyoxyethylene alkyl ethers with an average addition mole of ethylene oxide of 10 or more.

[0110] A polyoxyethylene alkyl ether with an average number of moles added of ethylene oxide of 10 or more may be, for example, one represented by the following formula (3). R b -(OCH2CH2) z -OH (3) (In the above formula (3), R b This represents a linear or branched saturated hydrocarbon group with 8 to 24 carbon atoms. Furthermore, z represents the average number of moles of ethylene oxide added, and is between 10 and 200.

[0111] Polyoxyethylene alkyl ethers with an average number of added moles of ethylene oxide of 10 or more may, for example, have hydrocarbon groups with 8 to 24 carbon atoms, or have hydrocarbon groups with 12 to 22 carbon atoms.

[0112] In polyoxyethylene alkyl ethers with an average number of moles of ethylene oxide added of 10 or more, the average number of moles of ethylene oxide added may be, for example, 10 to 200, 15 to 150, or 20 to 60.

[0113] Examples of polyoxyethylene alkyl ethers with an average number of moles of ethylene oxide added of 10 or more include polyoxyethylene caprylyl ether, polyoxyethylene lauryl ether, polyoxyethylene myristyl ether, polyoxyethylene cetyl ether, polyoxyethylene isocetyl ether, polyoxyethylene stearyl ether, polyoxyethylene isostearyl ether, polyoxyethylene cetostearyl ether, polyoxyethylene arachidyl ether, polyoxyethylene behenyl ether, polyoxyethylene oleyl ether, polyoxyethylene lanolyl ether, polyoxyethylene phytosterol ether, polyoxyethylene alkyl (12-14) ether, or polyethylene glycol ether of a mixed alcohol having 9 to 40 carbon atoms (the alcohol may be, for example, a primary alcohol or a secondary alcohol).

[0114] Polyoxyethylene alkyl ethers with an average number of moles of ethylene oxide added of 10 or more may include, for example, polyoxyethylene caprylyl ether, polyoxyethylene lauryl ether, polyoxyethylene myristyl ether, polyoxyethylene cetyl ether, polyoxyethylene isocetyl ether, polyoxyethylene stearyl ether, polyoxyethylene isostearyl ether, polyoxyethylene cetostearyl ether, polyoxyethylene arachidyl ether, polyoxyethylene behenyl ether, polyoxyethylene oleyl ether, polyoxyethylene lanolyl ether, polyoxyethylene phytosterol ether, polyoxyethylene alkyl (12-14) ether, or polyethylene glycol ether of a mixed alcohol having 9 to 40 carbon atoms (the alcohol may be, for example, a primary alcohol or a secondary alcohol).

[0115] (Amount of polyoxypropylene alkyl ether, etc.) The amount of one or more selected from the group including polyoxypropylene alkyl ethers in the second agent of this embodiment (referring to the total amount of polyoxypropylene alkyl ether, polypropylene glycol, and polyoxyethylene alkyl ether with an average addition mole of ethylene oxide of 10 or more blended in the second agent of this embodiment; the same applies hereinafter) is not particularly limited and may be set as appropriate.

[0116] The amount of one or more selected from the group including polyoxypropylene alkyl ethers in the second agent of this embodiment is, for example, 0.01% by mass or more, but from the viewpoint of superior uniformity, 0.1% by mass or more is preferred, 0.3% by mass or more is more preferred, and 0.5% by mass or more is even more preferred.

[0117] The amount of one or more selected from the group including polyoxypropylene alkyl ethers in the second agent of this embodiment is, for example, 20% by mass or less, but from the viewpoint of making the hair softer to the touch after treatment with the oxidative hair dye of this embodiment, it is preferably 10% by mass or less, more preferably 8% by mass or less, and even more preferably 5% by mass or less.

[0118] The range of the amount of one or more selected from the group such as polyoxypropylene alkyl ethers in the second agent of this embodiment is, for example, 0.01% by mass or more and 20% by mass or less, but from the above viewpoint, 0.1% by mass or more and 10% by mass or less is preferred, 0.3% by mass or more and 8% by mass or less is more preferred, and 0.5% by mass or more and 5% by mass or less is even more preferred.

[0119] ([Polyoxypropylene alkyl ether, etc. / oxidizing agent] ratio) The mass ratio ([polyoxypropylene alkyl ether etc. / oxidizing agent] ratio) of the amount of one or more selected from the group including polyoxypropylene alkyl ethers, etc., in the second agent of this embodiment to the amount of oxidizing agent blended in the second agent of this embodiment is not particularly limited and may be set as appropriate, for example, it may be 0.01 or more and 20 or less, or 0.1 or more and 10 or less.

[0120] ([Polyoxypropylene alkyl ether, etc. / Ester of fatty acid and higher alcohol] ratio) The mass ratio ([polyoxypropylene alkyl ether etc. / fatty acid and higher alcohol ester] ratio) of the amount of one or more selected from the group including polyoxypropylene alkyl ether etc. in the second agent of this embodiment to the amount of ester of fatty acid and higher alcohol incorporated in the second agent of this embodiment is not particularly limited and may be set as appropriate, for example, it may be 0.1 or more and 100 or less, or 1 or more and 50 or less.

[0121] (Optional components of the second drug) The second agent may contain other components (hereinafter referred to as "optional components of the second agent") other than the oxidizing agent, ester of fatty acid and higher alcohol, polyoxypropylene alkyl ether, etc., as appropriate. The optional components of the second agent can be appropriately selected from known components used in oxidative hair dyes, and examples include water, surfactants, higher alcohols, polyhydric alcohols, lower alcohols, hydrocarbons, silicones, chelating agents, etc. (excluding those that fall under the category of oxidizing agents, ester of fatty acid and higher alcohol, polyoxypropylene alkyl ether, etc.).

[0122] (water) The second agent of this embodiment may contain water. The amount of water in the second agent of this embodiment is, for example, 30% by mass or more and 80% by mass or less.

[0123] (Surfactants) The second agent of this embodiment may, for example, contain one or more surfactants. Known surfactants used in hair compositions may be used as the surfactants. Examples of surfactants include anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants. The same surfactants described in the first agent of this embodiment may be used as the surfactants (except for those corresponding to polyoxypropylene alkyl ethers, etc.). The amount of surfactant in the second agent of this embodiment is, for example, 0.5% by mass or more and 10% by mass or less.

[0124] (High-grade alcohol) The second agent of this embodiment may, for example, contain one or more higher alcohols. As the higher alcohol, for example, the same higher alcohols described in the first agent of this embodiment can be used. The amount of higher alcohol in the second agent of this embodiment is, for example, 1% by mass or more and 10% by mass or less.

[0125] (Polyhydric alcohol) The second agent of this embodiment may, for example, contain one or more polyhydric alcohols. As the polyhydric alcohol, for example, the same polyhydric alcohols described in the first agent of this embodiment can be used. The amount of polyhydric alcohol in the second agent of this embodiment is, for example, 0.01% by mass or more and 10% by mass or less.

[0126] (viscosity) The viscosity of the second agent in this embodiment is set as appropriate, but for example, it is 10,000 mPa·s or less. Here, the viscosity of the second agent in this embodiment is adopted as the value obtained after 60 seconds at 25°C using a B-type viscometer with a rotor selected according to the viscosity. The rotation speed of the rotor during measurement is, for example, 12 rpm.

[0127] (pH) The pH of the second agent in this embodiment is not particularly limited and may be set appropriately depending on the type of oxidizing agent included.

[0128] The pH of the second agent in this embodiment is, for example, 2.0 or higher when hydrogen peroxide is added as an oxidizing agent to the second agent in this embodiment, but from the viewpoint of reducing the risk of hair damage, 2.5 or higher is preferred, and 3.0 or higher is more preferred.

[0129] The pH of the second agent in this embodiment is, for example, 4.0 or less when hydrogen peroxide is added as an oxidizing agent to the second agent in this embodiment, but from the viewpoint of dyeing the hair more intensely, 3.8 or less is preferable, and 3.5 or less is more preferable.

[0130] The pH range of the second agent in this embodiment is, for example, 2.0 to 4.0 when hydrogen peroxide is added as an oxidizing agent to the second agent in this embodiment, but from the above viewpoint, 2.5 to 3.8 is preferred, and 3.0 to 3.5 is more preferred.

[0131] (Dosage form) The dosage form of the second agent in this embodiment may be set as appropriate. Examples of dosage forms include liquid (including emulsion), cream, gel, and powder.

[0132] The second agent of this embodiment may be an emulsion or cream-type dosage form containing, for example, water, a surfactant (for example, one or more selected from anionic surfactants, cationic surfactants, nonionic surfactants (excluding those corresponding to polyoxypropylene alkyl ethers, etc.), and amphoteric surfactants), and a higher alcohol. When the second agent of this embodiment is an emulsion or cream-type dosage form, the viscosity of the second agent of this embodiment is, for example, 1000 mPa·s or more and 10000 mPa·s or less.

[0133] (Manufacturing method) The method for producing the second agent of this embodiment is not particularly limited, and a known method for producing the second agent relating to an oxidative hair dye may be used depending on the dosage form and components of the second agent of this embodiment. For example, it may be produced by mixing an oxidizing agent, an ester of a fatty acid and a higher alcohol, a polyoxypropylene alkyl ether, and any optional components of the second agent as needed, using a conventional method.

[0134] (Product form) The second agent of this embodiment may be labeled on the packaging or product materials (package, brochure, catalog, instruction manual, etc.) indicating that it is used to obtain an oxidative hair dye by mixing it with the first agent, which contains an oxidative dye. Alternatively, the second agent of this embodiment may be in a product form in which the packaging or product materials (package, brochure, catalog, instruction manual, etc.) indicate that the hair treated with the oxidative hair dye obtained by mixing the second agent with the first agent containing an oxidative dye exhibits excellent uniform coloring properties. Furthermore, the second agent of this embodiment may be labeled on the packaging or product materials (package, brochure, catalog, instruction manual, etc.) indicating that it is a second agent for oxidative hair dyes.

[0135] [How to use] The oxidative hair dye of this embodiment may be used in accordance with known methods for using oxidative hair dyes.

[0136] One method of using the oxidative hair dye of this embodiment is to mix the first agent and the second agent of this embodiment in an appropriate mass ratio (for example, the first agent and the second agent of this embodiment in a mass ratio of 1:0.4 to 1:3), apply an appropriate amount of the resulting oxidative hair dye to the hair, treat it for a predetermined time (for example, 5 minutes or more and 40 minutes or less), and then wash and dry the hair.

[0137] (Target hair) The target hair in the oxidative hair dye of this embodiment is not particularly limited and may include hair that has a history of being dyed with an oxidative hair dye, or hair that has no history of being dyed with an oxidative hair dye.

[0138] The oxidative hair dye of this embodiment exhibits excellent uniform dyeing properties even on hair that is damaged due to frizz or curling. It should be noted that hair tends to become more frizzy or curly with age, and the degree of frizz or curling, as well as the degree of hair damage, tend to increase. The oxidative hair dye of this embodiment may be an oxidative hair dye for hair that is damaged due to frizz or curling associated with aging.

[0139] [Application] The oxidative hair dye of this embodiment is used for dyeing hair. As mentioned above, hair tends to become wavy or frizzy with age, and the degree of waviness or frizz, as well as the degree of hair damage, also tends to increase. Therefore, the oxidative hair dye of this embodiment may be an oxidative hair dye for aging hair (for example, for the hair of people aged 30 or older, or for the hair of people aged 40 or older).

[0140] <Oxidative Hair Dye Kit> The oxidative hair dye kit of this embodiment (hereinafter sometimes referred to as the kit of this embodiment) At least one of the following (A), (B), or (C): (A) One or more selected from paraphenylenediamine or its salts, and 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts, metaaminophenol or its salts, and 5-amino-o-cresol or its salts, (B) One or more selected from toluene-2,5-diamine or its salts, and one or more selected from meta-aminophenol or its salts, 5-amino-o-cresol or its salts, and resorcinol. (C) One or more selected from para-aminophenol or its salts, and one or more selected from meta-aminophenol or its salts, and 5-amino-o-cresol or its salts. The first agent contains the following ingredients: Oxidizing agent, Esters of fatty acids and higher alcohols, and, The product comprises a second agent containing one or more selected from the group consisting of polyoxypropylene alkyl ether, polypropylene glycol, and polyoxyethylene alkyl ether with an average addition mole of ethylene oxide of 10 or more.

[0141] The kit of this embodiment may be an oxidative hair dye kit for preparing an oxidative hair dye using the first agent and the second agent of this embodiment.

[0142] [Product form] The product form of the kit of this embodiment is not particularly limited, but may be, for example, a two-part oxidative hair dye kit. Alternatively, the kit of this embodiment may be a three-part or more oxidative hair dye kit using, for example, the first agent of this embodiment, the second agent of this embodiment, and one or more other agents.

[0143] In the case of a two-part oxidative hair dye kit, for example, the first agent and the second agent of this embodiment described above may be housed in separate containers, and the containers containing the first agent or the second agent may be packaged in separate packaging materials (such as cosmetic boxes), or they may be packaged together in the same packaging material (such as cosmetic boxes).

[0144] The method of using the kit of this embodiment is the same as the method of use for the oxidative hair dye of this embodiment described above. For example, an oxidative hair dye can be prepared using the first agent and the second agent of this embodiment and used on hair.

[0145] <Hair dyeing methods> The hair dyeing method of this embodiment is a method of dyeing hair using the oxidative hair dye of this embodiment described above. Aside from using the oxidative hair dye of this embodiment, the hair dyeing method of this embodiment can employ the same method as a known hair dyeing method using an oxidative hair dye. Therefore, the method of using the oxidative hair dye of this embodiment described above may also be used.

[0146] Furthermore, the hair dyeing method of this embodiment may also be a hair treatment method using the kit of this embodiment described above. [Examples]

[0147] The present invention will be described in detail below based on examples, but the present invention should not be interpreted as being limited based on the description of these examples.

[0148] (Manufacturing of the first and second components of the oxidative hair dyes for Examples 1-13 and Comparative Examples 1-21) Using the components of the first and second agents shown below, the components were mixed by conventional methods to obtain the compositions shown in Tables 1 to 8, thereby producing the first and second agents for the oxidative hair dyes of Examples 1 to 13 and Comparative Examples 1 to 21. The values ​​in the component column of Tables 1 to 8 are in mass percent.

[0149] (Ingredients used in the first agent) Oxidation dyes Paraphenylenediamine, 2,2'-[(4-aminophenyl)imino]bisethanol sulfate, toluene-2,5-diamine sulfate, para-aminophenol, 2,4-diaminophenoxyethanol hydrochloride, meta-aminophenol, 5-amino-o-cresol, resorcinol Other ingredients Cetanol, stearyl alcohol, product name: Clodaphos CES (containing dicetyl phosphate), polyoxyethylene cetyl ether (30 E.O.), propylene glycol, ammonia water, sodium sulfite, ascorbic acid, ethylenediamine hydroxyethyl triacetate trisodium dihydrate, fragrance, purified water

[0150] The breakdown of the common component (1) shown in Tables 1 to 8 below is as follows: Cetanol 3.50% by mass, Stearyl alcohol 3.50% by mass, Product name: Clodaphos CES (containing dicetyl phosphate) 1.50% by mass, Polyoxyethylene cetyl ether (30 E.O.) 4.00% by mass, Propylene glycol 1.00% by mass, Ammonia water 1.50% by mass, Sodium sulfite 0.20% by mass, Ascorbic acid 0.15% by mass, Ethylenediamine hydroxyethyl triacetate trisodium dihydrate 0.20% by mass, Fragrance 0.10% by mass

[0151] (Ingredients used in the second agent) Oxidizing agent hydrogen peroxide • Polyoxypropylene alkyl ethers, etc. Polyoxypropylene stearyl ether (15P.O.), polypropylene glycol (average degree of polymerization 17), polyoxyethylene cetyl ether (30E.O.) • Esters of fatty acids and higher alcohols Isostearyl Isostearate Other ingredients Glyceryl triisostearate, polyoxyethylene stearyl ether (5 E.O.), polyoxyethylene polyoxypropylene cetyl ether (1 E.O.) (4 P.O.), stearyltrimethylammonium chloride, cetanol, stearyl alcohol, liquid paraffin, tetrasodium hydroxyethanediphosphonate, phenoxyethanol, purified water

[0152] The breakdown of the common component (2) shown in Tables 1 to 8 below is as follows: Hydrogen peroxide 2.80% by mass, stearyltrimethylammonium chloride 0.14% by mass, cetanol 2.00% by mass, stearyl alcohol 2.00% by mass, liquid paraffin 2.00% by mass, tetrasodium hydroxyethanediphosphonate 0.01% by mass, phenoxyethanol 0.05% by mass

[0153] In addition, among the components used in the first and second agents, the notations "EO" and "PO" in polyoxyethylene cetyl ether (30 E.O.), polyoxypropylene stearyl ether (15 P.O.), polyoxyethylene cetyl ether (30 E.O.), polyoxyethylene stearyl ether (5 E.O.), and polyoxyethylene polyoxypropylene cetyl ether (1 E.O.) (4 P.O.) are abbreviations for ethylene oxide and propylene oxide, respectively. Furthermore, the numbers preceding "EO" and "PO" represent the average number of moles of ethylene oxide and propylene oxide added, respectively.

[0154] (evaluation) The first and second components of the oxidative hair dyes manufactured in Examples 1-13 and Comparative Examples 1-21 were evaluated as follows.

[0155] (Preparing the hair bundles) Multiple hair bundles (Beaulux "BR-3-A": approximately 1g, approximately 10cm long, light brown human hair bundles) were prepared and subjected to the damage treatment described later to obtain damaged hair bundles. In addition, hair bundles that were not subjected to damage treatment (Beaulux "BR-3-A": approximately 1g, approximately 10cm long, light brown human hair bundles) were also prepared as untreated hair bundles.

[0156] (Damage processing) The hair strands were treated for damage using the following procedure. 4g of the first permanent wave solution (Milbon's "Neolisio H1 Solution": a preparation containing reducing agents (thioglycolate, cysteine ​​salt), alkali (monoethanolamine, etc.)) was applied to each hair strand and left to stand for 15 minutes. After 15 minutes, it was rinsed with water. Next, 2g of the second permanent wave solution (Milbon's "Neolisio 2nd Solution": a preparation containing oxidizing agents (hydrogen peroxide, etc.)) was applied to each wet hair strand and left to stand for 10 minutes. After 10 minutes, each hair strand was rinsed with water, an appropriate amount of shampoo (Milbon's "Grand Linkage Willow Luxe Shampoo") was applied and washed, then rinsed with water and dried with a hairdryer to create damaged hair strands.

[0157] (Hair dyeing treatment) The first agent and the second agent of the oxidative hair dyes of Examples 1-13 and Comparative Examples 1-21 were mixed in 1.5g portions to produce the oxidative hair dyes of Examples 1-13 and Comparative Examples 1-21. Next, 3g of each oxidative hair dye from Examples 1-13 and Comparative Examples 1-21 were applied to damaged hair bundles and untreated hair bundles, respectively, and left to stand at room temperature for 20 minutes. After 20 minutes, each hair bundle was rinsed with water, an appropriate amount of shampoo (Milbon's "Grand Linkage Willow Luxe Shampoo") was applied and washed, then rinsed with water and dried with a hairdryer.

[0158] For the hair strands treated with the aforementioned hair dyeing process, the L values ​​(L1) for damaged hair strands and the L values ​​(L2) for untreated hair strands were measured using a spectrophotometer (Konica Minolta Sensing Co., Ltd. "Spectrophotometer CM-5") with the measurement mode set to SCE measurement (specular reflection removal). Using the obtained L values, the ΔL (absolute difference between the L value (L2) for damaged hair strands and the L value (L1) for untreated hair strands) for the oxidative hair dyes of Examples 1-24 and Comparative Examples 1-6 was calculated using the following formula.

[0159] ΔL = |L value in damaged hair bundle (L2) - L value in untreated hair bundle (L1)|

[0160] Here, the smaller the value of ΔL, the smaller the difference in L values ​​between damaged hair strands after dyeing and untreated hair strands. Therefore, regardless of the difference in the degree of hair damage, it will have superior uniform dyeing properties (hair dyeing with uniform density throughout the hair). In other words, the smaller the value of ΔL compared to the oxidative hair dye used for comparison, the better the uniform dyeing properties.

[0161] The ΔL values ​​for the oxidative hair dyes in Examples 1-3 and Comparative Examples 1-5 are the average values ​​(N=3) obtained when the hair dyeing treatment and spectrophotometer measurement described above were performed a total of three times. The ΔL values ​​for the oxidative hair dyes in Examples 4-13 and Comparative Examples 6-21 are the ΔL values ​​obtained when the hair dyeing treatment and spectrophotometer measurement described above were performed once.

[0162] (Evaluation results) Tables 1 to 8 show the evaluation results using oxidative hair dyes in Examples 1 to 13 and Comparative Examples 1 to 21.

[0163] (Evaluation results: Example 1, Comparative Examples 1-2) Table 1 shows the evaluation results of the oxidative hair dyes for Example 1 and Comparative Examples 1-2.

[0164] [Table 1]

[0165] As shown in Table 1, the hair strands dyed with the oxidative hair dye of Example 1 (using a second agent containing an oxidizing agent, an ester of fatty acids and higher alcohols, and polyoxypropylene alkyl ether, etc.) had a smaller ΔL value and superior uniformity compared to the hair strands dyed with the oxidative hair dye of Comparative Example 1 (using a second agent containing an oxidizing agent and an ester of fatty acids and higher alcohols, but without polyoxypropylene alkyl ether, etc.) and the oxidative hair dye of Comparative Example 2 (using a second agent containing an oxidizing agent, but without an ester of fatty acids and higher alcohols, and without polyoxypropylene alkyl ether, etc.).

[0166] (Evaluation results: Examples 1-3, Comparative Example 1, Comparative Examples 3-4) Table 2 shows the evaluation results of the oxidative hair dyes for Examples 1-3, Comparative Example 1, and Comparative Examples 3-4.

[0167] [Table 2]

[0168] As shown in Table 2, the hair strands dyed with the oxidative hair dyes of Examples 1-3 (using a second agent containing an oxidizing agent, an ester of fatty acids and higher alcohols, and polyoxypropylene alkyl ether, etc.) had smaller ΔL values ​​and superior uniformity compared to the hair strands dyed with the oxidative hair dye of Comparative Example 1 (using a second agent containing an oxidizing agent and an ester of fatty acids and higher alcohols, but without polyoxypropylene alkyl ether, etc.) and the oxidative hair dyes of Comparative Examples 3-4 (using a second agent containing an oxidizing agent, but without an ester of fatty acids and higher alcohols, and without polyoxypropylene alkyl ether, etc.). Furthermore, a comparison of the ΔL values ​​of the oxidative hair dyes of Examples 1-3 showed that, among polyoxypropylene alkyl ethers, etc., the ΔL values ​​were smallest and the uniformity was superior in the order of polyoxyethylene alkyl ether, polypropylene glycol, and polyoxypropylene alkyl ether, in which case the average number of moles of ethylene oxide added was 10 or more.

[0169] (Evaluation results: Example 1, Comparative Example 5) Table 3 shows the evaluation results of the oxidative hair dyes for Example 1 and Comparative Example 5.

[0170] [Table 3]

[0171] As shown in Table 3, the hair strands dyed with the oxidative hair dye of Example 1 (using a second agent containing an oxidizing agent, an ester of fatty acids and higher alcohols, and polyoxypropylene alkyl ether, etc.) had a smaller ΔL value and superior uniformity compared to the hair strands dyed with the oxidative hair dye of Comparative Example 5 (which did not contain an ester of fatty acids and higher alcohols, and used a second agent containing an oxidizing agent and polyoxypropylene alkyl ether, etc.).

[0172] Here, from the evaluation results of the oxidative hair dyes in Example 1 and Comparative Examples 1-5, which share the same first agent (Tables 1-3), it can be seen that oxidative hair dyes using a first agent containing paraphenylenediamine and 2,4-diaminophenoxyethanol hydrochloride ((A1)) as oxidative dyes, and a second agent containing a combination of an oxidizing agent, an ester of a fatty acid and a higher alcohol, and a polyoxypropylene alkyl ether, exhibit excellent uniformity.

[0173] (Evaluation results: Examples 4-5, Comparative Examples 6-9) Table 4 shows the evaluation results of the oxidative hair dyes for Example 4 and Comparative Example 6, Example 5 and Comparative Example 7, Comparative Example 8 and Comparative Example 9.

[0174] [Table 4]

[0175] The results shown in Table 4 indicate that oxidative hair dyes using a first agent containing paraphenylenediamine and meta-aminophenol or 5-amino-o-cresol ((A2) or (A3)) and a second agent containing an oxidizing agent, an ester of a fatty acid and a higher alcohol, and a polyoxypropylene alkyl ether, etc., exhibit a small ΔL value and excellent uniformity (comparison between Example 4 and Comparative Example 6, and between Example 5 and Comparative Example 7, where the first agent is common). Furthermore, oxidative hair dyes using a first agent containing paraphenylenediamine and resorcinol (oxidative dyes other than (A) to (C)) as oxidative dyes exhibit a large ΔL value and poor uniformity, even when using a second agent containing an oxidizing agent, an ester of a fatty acid and a higher alcohol, and a polyoxypropylene alkyl ether, etc. (comparison between Comparative Example 8 and Comparative Example 9, where the first agent is common).

[0176] (Evaluation results: Examples 6-7, Comparative Examples 10-11) Table 5 shows the evaluation results of the oxidative hair dyes for Example 6 and Comparative Example 10, and Example 7 and Comparative Example 11.

[0177] [Table 5]

[0178] The results shown in Table 5 indicate that oxidative hair dyes using a first agent containing 2,2'-[(4-aminophenyl)imino]bisethanol sulfate and 2,4-diaminophenoxyethanol or meta-aminophenol ((A4) or (A5)) hydrochloride, and a second agent containing an oxidizing agent, an ester of a fatty acid and a higher alcohol, and a polyoxypropylene alkyl ether, etc., exhibit a small ΔL value and excellent uniformity (comparison between Example 6 and Comparative Example 10, where the first agent is common, and comparison between Example 7 and Comparative Example 11).

[0179] (Evaluation results: Example 8, Comparative Examples 12-14) Table 6 shows the evaluation results of the oxidative hair dyes for Example 8 and Comparative Examples 12, 13, and 14.

[0180] [Table 6]

[0181] The results shown in Table 6 indicate that oxidative hair dyes using a first agent containing 2,2'-[(4-aminophenyl)imino]bisethanol sulfate and 5-amino-orthocresol ((A6)), and a second agent containing an oxidizing agent, an ester of a fatty acid and a higher alcohol, and a polyoxypropylene alkyl ether, etc., exhibit a small ΔL value and excellent uniformity (comparison between Example 8 and Comparative Example 12, both of which share the same first agent). Furthermore, oxidative hair dyes using a first agent containing 2,2'-[(4-aminophenyl)imino]bisethanol sulfate and resorcinol (oxidative dyes other than (A)~(C)) as oxidative dyes exhibit a large ΔL value and poor uniformity, even when using a second agent containing an oxidizing agent, an ester of a fatty acid and a higher alcohol, and a polyoxypropylene alkyl ether, etc. (comparison between Comparative Example 13 and Comparative Example 14, both of which share the same first agent).

[0182] (Evaluation results: Examples 9-11, Comparative Examples 15-17) Table 7 shows the evaluation results of the oxidative hair dyes for Example 9 and Comparative Example 15, Example 10 and Comparative Example 16, and Example 11 and Comparative Example 17.

[0183] [Table 7]

[0184] The results shown in Table 7 indicate that oxidative hair dyes using a first agent containing toluene-2,5-diamine sulfate and meta-aminophenol, 5-amino-o-cresol, or resorcinol ((B1), (B2), or (B3)), and a second agent containing an oxidizing agent, an ester of a fatty acid and a higher alcohol, and a polyoxypropylene alkyl ether, etc., exhibit a small ΔL value and excellent uniformity (comparison between Example 9 and Comparative Example 15, where the first agent is common; comparison between Example 10 and Comparative Example 16; and comparison between Example 11 and Comparative Example 17).

[0185] (Evaluation results: Examples 12-13, Comparative Examples 18-21) Table 8 shows the evaluation results of the oxidative hair dyes for Example 12 and Comparative Example 18, Example 13 and Comparative Example 19, Comparative Example 20 and Comparative Example 21.

[0186] [Table 8]

[0187] The results shown in Table 8 indicate that oxidative hair dyes using a first agent containing para-aminophenol and meta-aminophenol or 5-amino-o-cresol ((C1) or (C2)) and a second agent containing an oxidizing agent, an ester of fatty acid and a higher alcohol, and polyoxypropylene alkyl ether, etc., exhibit a small ΔL value and excellent uniformity (comparison between Example 12 and Comparative Example 18, and between Example 13 and Comparative Example 19, both of which share the same first agent). Furthermore, oxidative hair dyes using a first agent containing para-aminophenol and resorcinol (oxidative dyes other than (A) to (C)) as oxidative dyes exhibit a large ΔL value and poor uniformity, even when using a second agent containing an oxidizing agent, an ester of fatty acid and a higher alcohol, and polyoxypropylene alkyl ether, etc. (comparison between Comparative Example 20 and Comparative Example 21, both of which share the same first agent).

[0188] (Evaluation of ΔL′) Using the ΔL values ​​for each combination of oxidative hair dyes in Example 1 and Comparative Example 1, Example 4 and Comparative Example 6, Example 5 and Comparative Example 7, Example 6 and Comparative Example 10, Example 7 and Comparative Example 11, Example 8 and Comparative Example 12, Example 9 and Comparative Example 15, Example 10 and Comparative Example 16, Example 11 and Comparative Example 17, Example 12 and Comparative Example 18, and Example 13 and Comparative Example 19, where the first agent was common and the composition of the second agent differed, the absolute value (ΔL′) of the difference between the ΔL of the Example and the ΔL of the Comparative Example for each combination of oxidative hair dyes was calculated using the following formula.

[0189] ΔL′ = |ΔL of the example being combined - ΔL of the comparative example being combined|

[0190] Here, in comparing each combination of oxidative hair dyes, a larger ΔL′ value than the comparison combination indicates superior uniform dyeing (hair dyeing with uniform density throughout the hair).

[0191] Furthermore, the above combinations of oxidative hair dyes for which ΔL′ was calculated share the same second agent composition among the examples (Examples 1, 4-13) and among the comparative examples (Comparative Examples 1, 6, 7, 10-12, 15-19). In addition, the oxidative dyes blended into the first agent differ among the above combinations of oxidative hair dyes. Therefore, by comparing the ΔL′ values ​​of the above combinations of oxidative hair dyes, it is possible to evaluate which of the oxidative dyes blended into the first agent exhibits superior uniform dyeing properties.

[0192] (Evaluation results of ΔL′) Table 9 shows the ΔL′ for each combination of oxidative hair dyes in Example 1 and Comparative Example 1, Example 4 and Comparative Example 6, Example 5 and Comparative Example 7, Example 6 and Comparative Example 10, Example 7 and Comparative Example 11, Example 8 and Comparative Example 12, Example 9 and Comparative Example 15, Example 10 and Comparative Example 16, Example 11 and Comparative Example 17, Example 12 and Comparative Example 18, and Example 13 and Comparative Example 19. In Table 9, the combination of oxidative hair dyes in Example 1 and Comparative Example 1 is denoted as "(Example 1, Comparative Example 1)" (the same notation is used for other combinations of oxidative hair dyes).

[0193] [Table 9]

[0194] As shown in Table 9, among the oxidation dyes used in the first agent, (A) showed the greatest ΔL′ values ​​and superior uniformity in the order of (A6), (A4), (A1), (A3), (A2), and (A5) (comparison of ΔL′ for each of (Example 1, Comparative Example 1), (Example 4, Comparative Example 6), (Example 5, Comparative Example 7), (Example 6, Comparative Example 10), and (Example 7, Comparative Example 11). Also, among (B) showed the greatest ΔL′ values ​​and superior uniformity in the order of (B3), (B1), and (B2) (comparison of ΔL′ for each of (Example 9, Comparative Example 15), (Example 10, Comparative Example 16), and (Example 11, Comparative Example 17). Also, among (C) showed the greatest ΔL′ values ​​and superior uniformity in the order of (C1), (C2) (comparison of ΔL′ for each of (Example 12, Comparative Example 18), and (Example 13, Comparative Example 19). Here, among the oxidation dyes (A) to (C) used in the first agent, the ΔL′ value was largest and the uniform dyeing performance was best in the order of (A6), (B3), (A4), (C1), (C2), (A1), (A3), (A2), (B1), (A5), and (B2).

[0195] In Table 9, (A1) to (C3) are as follows: (A1) One or more selected from paraphenylenediamine or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts (A2) One or more selected from paraphenylenediamine or its salts, and one or more selected from meta-aminophenol or its salts (A3) One or more selected from paraphenylenediamine or its salts, and one or more selected from 5-amino-o-cresol or its salts (A4) One or more selected from 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts. (A5) One or more selected from 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from metaaminophenol or its salts. (A6) One or more selected from 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 5-amino-o-cresol or its salts. (B1) One or more selected from toluene-2,5-diamine or its salts, and one or more selected from meta-aminophenol or its salts. (B2) One or more selected from toluene-2,5-diamine or its salts, and one or more selected from 5-amino-o-cresol or its salts. (B3) One or more selected from toluene-2,5-diamine or its salts, and resorcinol (C1) One or more selected from para-aminophenol or its salts, and one or more selected from meta-aminophenol or its salts. (C2) One or more selected from para-aminophenol or its salts, and one or more selected from 5-amino-o-cresol or its salts.

[0196] (Example prescription) An example of an oxidative hair dye formulation is shown below.

[0197] Prescription Example 1 (Two-part oxidative hair dye) (First drug) Paraphenylenediamine 0.05% by mass 2,2'-[(4-aminophenyl)imino]bisethanol sulfate 0.05% by mass Toluene-2,5-diamine sulfate 0.02% by mass Para-aminophenol 0.08% by mass 2,4-Diaminophenoxyethanol hydrochloride 0.10% by mass Meta-aminophenol 0.06% by mass 5-amino-o-cresol 0.02% by mass Resorcinol 0.02% by mass Cetanol 3.50% by mass Stearyl alcohol 3.50% by mass Product Name: Clodaphos CES 1.50% by mass Polyoxyethylene cetyl ether (30 E.O.) 4.00% by mass Propylene glycol 1.00% by mass Ammonia solution 1.50% by mass Sodium sulfite 0.20% by mass Ascorbic acid 0.15% by mass Ethylenediamine hydroxyethyl triacetate trisodium dihydrate 0.20% by mass Fragrance 0.10% by mass Purified water 83.95% by mass (Second drug) Hydrogen peroxide 2.80% by mass Isostearyl isostearate 1.00% by mass Polyoxypropylene stearyl ether (15P.O.) 1.00% by mass Polypropylene glycol (average degree of polymerization 17) 0.50% by mass Polyoxyethylene cetyl ether (30 E.O.) 1.00% by mass Stearyltrimethylammonium chloride 0.14% by mass Cetanol 2.00% by mass Stearyl alcohol 2.00% by mass Tetrasodium hydroxyethanediphosphonate 0.01% by mass Phenoxyethanol 0.05% by mass Purified water 89.50% by mass

[0198] Prescription Example 2 (3-part oxidative hair dye) (First drug) Paraphenylenediamine 0.05% by mass 2,2'-[(4-aminophenyl)imino]bisethanol sulfate 0.05% by mass Toluene-2,5-diamine sulfate 0.02% by mass Para-aminophenol 0.08% by mass 2,4-Diaminophenoxyethanol hydrochloride 0.10% by mass Meta-aminophenol 0.06% by mass 5-amino-o-cresol 0.02% by mass Resorcinol 0.02% by mass Cetanol 3.50% by mass Stearyl alcohol 3.50% by mass Product Name: Clodaphos CES 1.50% by mass Polyoxyethylene cetyl ether (30 E.O.) 4.00% by mass Propylene glycol 1.00% by mass Ammonia solution 1.50% by mass Sodium sulfite 0.20% by mass Ascorbic acid 0.15% by mass Ethylenediamine hydroxyethyl triacetate trisodium dihydrate 0.20% by mass Fragrance 0.10% by mass Purified water 83.95% by mass (Second drug) Hydrogen peroxide 2.80% by mass Isostearyl isostearate 1.00% by mass Polyoxypropylene stearyl ether (15P.O.) 1.00% by mass Polypropylene glycol (average degree of polymerization 17) 0.50% by mass Polyoxyethylene cetyl ether (30 E.O.) 1.00% by mass Stearyltrimethylammonium chloride 0.14% by mass Cetanol 2.00% by mass Stearyl alcohol 2.00% by mass Tetrasodium hydroxyethanediphosphonate 0.01% by mass Phenoxyethanol 0.05% by mass Purified water 89.50% by mass (Third drug) Ammonium persulfate 30% by mass Potassium persulfate 10% by mass Sodium persulfate 10% by mass Higher fatty acid salts 10% by mass Chelating agent 1% by mass Xanthan gum 0.1% by mass Sodium metasilicate 5% by mass Sodium silicate 5% by mass Magnesium carbonate 5% by mass Anhydrous silicic acid 23.9% by mass

Claims

1. At least one of the following (A), (B), and (C): (A) One or more selected from paraphenylenediamine or its salts, and 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts, metaaminophenol or its salts, and 5-amino-o-cresol or its salts, (B) One or more selected from toluene-2,5-diamine or its salts, and one or more selected from meta-aminophenol or its salts, 5-amino-o-cresol or its salts, and resorcinol, (C) One or more selected from para-aminophenol or its salts, and one or more selected from meta-aminophenol or its salts, and 5-amino-o-cresol or its salts, The first agent contains the following ingredients: Oxidizing agent, Esters of fatty acids and higher alcohols, and, A second agent comprising one or more selected from the group consisting of polyoxypropylene alkyl ether, polypropylene glycol, and polyoxyethylene alkyl ether with an average addition mole of ethylene oxide of 10 or more, An oxidative hair dye that was used.

2. The oxidative hair dye according to claim 1, wherein the second agent is an ester of a branched fatty acid and a branched higher alcohol, as the ester of a fatty acid and a higher alcohol.

3. The oxidative hair dye according to claim 1 or 2, wherein the second agent is formulated with one or more selected from the group consisting of polyoxypropylene alkyl ether, polypropylene glycol, and polyoxyethylene alkyl ether with an average number of moles of ethylene oxide added of 10 or more, and one or more selected from polyoxypropylene stearyl ether, polypropylene glycol with an average degree of polymerization of 3 or more, and polyoxyethylene alkyl ether with an average number of moles of ethylene oxide added of 20 or more.

4. (A) is one or more selected from paraphenylenediamine or its salts and 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts and 5-amino-o-cresol or its salts. (B) is one or more selected from toluene-2,5-diamine or its salts, and one or more selected from meta-aminophenol or its salts, and resorcinol, or The oxidative hair dye according to claim 1 or 2, wherein (C) is one or more selected from para-aminophenol or its salts, and one or more selected from meta-aminophenol or its salts.

5. The oxidative hair dye according to claim 4, wherein (A) is at least one of the following (A4) and (A6). (A4) One or more selected from 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts. (A6) One or more selected from 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 5-amino-o-cresol or its salts.

6. At least one of the following (A), (B), and (C): (A) One or more selected from paraphenylenediamine or its salts, and 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts, metaaminophenol or its salts, and 5-amino-o-cresol or its salts, (B) One or more selected from toluene-2,5-diamine or its salts, and one or more selected from meta-aminophenol or its salts, 5-amino-o-cresol or its salts, and resorcinol, (C) One or more selected from para-aminophenol or its salts, and one or more selected from meta-aminophenol or its salts, and 5-amino-o-cresol or its salts, The first agent contains the following ingredients: A second agent containing an oxidizing agent, and a second agent in an oxidative hair dye using the above, Esters of fatty acids and higher alcohols, and, A second agent comprising one or more substances selected from the group consisting of polyoxypropylene alkyl ethers, polypropylene glycols, and polyoxyethylene alkyl ethers with an average addition mole of ethylene oxide of 10 or more.

7. At least one of the following (A), (B), and (C): (A) One or more selected from paraphenylenediamine or its salts, and 2,2'-[(4-aminophenyl)imino]bisethanol or its salts, and one or more selected from 2,4-diaminophenoxyethanol or its salts, metaaminophenol or its salts, and 5-amino-o-cresol or its salts, (B) One or more selected from toluene-2,5-diamine or its salts, and one or more selected from meta-aminophenol or its salts, 5-amino-o-cresol or its salts, and resorcinol, (C) One or more selected from para-aminophenol or its salts, and one or more selected from meta-aminophenol or its salts, and 5-amino-o-cresol or its salts, The first agent contains the following ingredients: Oxidizing agent, Esters of fatty acids and higher alcohols, and, A second agent comprising one or more selected from the group consisting of polyoxypropylene alkyl ether, polypropylene glycol, and polyoxyethylene alkyl ether with an average addition mole of ethylene oxide of 10 or more, A hair dye kit containing oxidative dye.

8. A hair dyeing method using the oxidative hair dye described in claim 1 or claim 2.

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