Oxidative hair dye composition

Abstract

To provide a technique capable of promoting heat generation of a mixture of a first agent and a second agent and suppressing color development.SOLUTION: The oxidation hair dye composition is used by mixing a first agent containing an oxidation dye and an alkali agent with a second agent containing an oxidizing agent. The first agent contains ascorbic acid or a related compound thereof in an amount of 1.0% by mass or more in terms of ascorbic acid, and a higher alcohol.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present specification relates to an oxidation hair dye composition that uses a mixture of a first agent and a second agent. [Background technology]

[0002] Oxidative hair dye compositions that dye hair by oxidizing an oxidative dye on the hair to develop color have been known. A typical oxidative hair dye composition consists of a first agent containing an oxidative dye and a second agent containing an oxidizing agent, and these agents are mixed together before application to the hair.

[0003] A known technique for improving the hair dyeing power of an oxidative hair dye composition is to heat the oxidative hair dye composition by causing self-heating when the first and second agents are mixed. For example, Patent Document 1 describes that by adding an iodide to the oxidative hair dye composition, the mixture of the first and second agents generates heat, improving the hair dyeing power of the oxidative hair dye composition. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-197507 Summary of the Invention [Problem to be solved by the invention]

[0005] The technology of Patent Document 1 achieves high hair dyeing power by generating heat from the mixture, but has the problem that the oxidative hair dye applied to the hair develops color in a short period of time, making it difficult to visually confirm the degree of hair dyeing. This specification provides a technology that can promote the generation of heat from the mixture of the first and second agents while suppressing color development. [Means for solving the problem]

[0006] As a result of extensive research, the present inventors have found that by incorporating a predetermined amount of ascorbic acids, the reducing power of the ascorbic acids can be effectively utilized, thereby promoting heat generation in the mixture and suppressing color development. Based on this finding, the present specification provides the following means.

[0007] The first aspect disclosed in this specification is an oxidation hair dye composition comprising a first agent containing an oxidation dye and an alkaline agent, and a second agent containing an oxidizing agent. The first agent contains 1.0% by mass or more of ascorbic acids, calculated as ascorbic acid, and a higher alcohol.

[0008] In a second aspect disclosed by the present specification, in the first aspect described above, the first agent may further contain an anionic surfactant having a carbon chain with 14 or more carbon atoms and a nonionic surfactant.

[0009] In a third aspect disclosed by the present specification, in the second aspect, the first agent may further contain silicone.

[0010] In a fourth aspect disclosed by the present specification, in the second or third aspect above, the first agent may contain 4.0% by mass or more of the higher alcohol, 0.5% by mass or more of the anionic surfactant, and 1.0% by mass or more of the nonionic surfactant.

[0011] In a fifth aspect disclosed by the present specification, in the first aspect, the first agent may further contain a carbonate salt.

[0012] In a sixth aspect disclosed by the present specification, in the fifth aspect above, the first agent may further contain an anionic surfactant, a nonionic surfactant, and an amphoteric surfactant.

[0013] In a seventh aspect disclosed by the present specification, in the sixth aspect, the first agent may further contain a polymer compound.

[0014] In an eighth aspect disclosed by the present specification, in the seventh aspect above, the first agent may contain 9.0% by mass or more of the higher alcohol, 10% by mass or more of the carbonate, 2.0% by mass or more of the anionic surfactant, 3.0% by mass or more of the nonionic surfactant, and 2.0% by mass or more of the amphoteric surfactant.

[0015] In a ninth aspect disclosed by the present specification, in any one of the fifth to eighth aspects, foaming may occur when the first part and the second part are mixed. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, one embodiment of the oxidative hair dye composition disclosed in this specification will be described. The oxidative hair dye composition is used by mixing a first agent containing an oxidative dye and an alkaline agent with a second agent containing an oxidizing agent. The first agent of the oxidative hair dye composition contains an ascorbic acid. The ascorbic acid can be added to suppress color development of the oxidative hair dye composition. The first agent of the oxidative hair dye composition also contains a higher alcohol. The higher alcohol can be added to improve the storage stability of the first agent. The oxidative hair dye composition may further contain an agent other than the first and second agents (i.e., a third agent).

[0017] [First agent] The first agent contains an oxidation dye, an alkaline agent, an ascorbic acid, and a higher alcohol.

[0018] [Oxidation dyes] Oxidation dyes are compounds that develop color through oxidative polymerization with an oxidizing agent and are generally classified into primary intermediates and couplers. Primary intermediates include, for example, o- or p-phenylenediamines or aminophenols, and their salts. Specific examples include p-phenylenediamine, toluene-2,5-diamine (p-toluylenediamine), N-phenyl-p-phenylenediamine, 4,4'-diaminodiphenylamine, p-aminophenol, o-aminophenol, p-methylaminophenol, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, 2-hydroxyethyl-p-phenylenediamine, o-chloro-p-phenylenediamine, 4-amino-m-cresol, 2-amino-4-hydroxyethylaminoanisole, 2,4-diaminophenol, and their salts. Salts include, for example, hydrochlorides, sulfates, acetates, and the like.

[0019] Examples of couplers include mainly m-diamines, aminophenols or diphenols, and salts thereof. Specific examples include resorcinol, pyrogallol, catechol, m-aminophenol, m-phenylenediamine, 2,4-diaminophenol, 1,2,4-benzenetriol, toluene-3,4-diamine, toluene-2,4-diamine, hydroquinone, α-naphthol, 2,6-diaminopyridine, 1,5-dihydroxynaphthalene, 5-amino-o-cresol, diphenylamine, p-methylaminophenol, phloroglucin, 2,4-diaminophenoxyethanol, 2,4-diaminophenoxyethanol hydrochloride, 2,4-dihydroxybenzoic acid, gallic acid, tannic acid, ethyl gallate, methyl gallate, propyl gallate, Chinese gallnut, 1-methoxy-2-amino-4-(2-hydroxyethyl)aminobenzene, 5-(2-hydroxyethylamino)-2-methylphenol, and salts thereof. The oxidation dye may contain only one of these or a combination of two or more of them depending on the desired color tone.

[0020] The content of the oxidative dye in the first agent is not particularly limited and may be determined appropriately depending on the tone and shade of the desired hair color. The lower limit of the content is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.5% by mass or more, and most preferably 1.0% by mass or more. The upper limit of the content is preferably 15% by mass or less, more preferably 13% by mass or less, even more preferably 10% by mass or less, and most preferably 8.0% by mass or less. The content range can be set by appropriately combining the above upper and lower limits, and is, for example, 0.01% by mass or more and 15% by mass or less, or, for example, 0.1% by mass or more and 13% by mass or less, or, for example, 0.5% by mass or more and 10% by mass or less, or, for example, 1.0% by mass or more and 8.0% by mass or less. A content of 0.01% by mass or more easily achieves sufficient hair dyeing power, while a content of less than 15% by mass increases the stability of the agent.

[0021] [Alkaline agent] The alkaline agent enhances the action of the oxidizing agent contained in the second agent, thereby improving hair brightness and swelling the hair, contributing to improved dye penetration. Examples of alkaline agents include ammonia, alkanolamines, ammonium salts, organic amines (e.g., 2-amino-2-methyl-1,3-propanediol, guanidine), inorganic alkalis (e.g., sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate), basic amino acids (e.g., arginine, lysine), and their salts. Specific examples of alkanolamines include monoethanolamine, diethanolamine, triethanolamine, monopropanolamine, isopropanolamine, dipropanolamine, tripropanolamine, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and 2-amino-2-hydroxymethyl-1,3-propanediol. Specific examples of ammonium salts include ammonium halides, inorganic ammonium salts, and organic ammonium salts. Examples of ammonium halides include ammonium chloride, inorganic ammonium salts include ammonium carbonate, ammonium hydrogen carbonate, ammonium sulfate, ammonium phosphate, and ammonium hydrogen phosphate, and organic ammonium salts include ammonium lactate, ammonium citrate, and ammonium glycolate.

[0022] The alkaline agent may contain only one of these or a combination of two or more of them. Among these, ammonia, monoethanolamine, or ammonium salts are preferably used from the viewpoint of excellent effect of improving the brightness of hair.

[0023] The content of the alkaline agent in the first agent is not particularly limited. The lower limit of the content is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.5% by mass or more, and most preferably 0.7% by mass or more. The upper limit of the content is preferably 10% by mass or less, more preferably 9.6% by mass or less, even more preferably 9.0% by mass or less, and most preferably 8.0% by mass or less. The content range can be set by appropriately combining the above upper and lower limits, and is, for example, 0.1% by mass or more and 10% by mass or less, or, for example, 0.2% by mass or more and 9.6% by mass or less, or, for example, 0.5% by mass or more and 9.0% by mass or less, or, for example, 0.7% by mass or more and 8.0% by mass or less. A content of 0.1% by mass or more makes it easy to obtain sufficient brightness, and a content of less than 10% by mass makes it easy to obtain a good feel on the finished hair.

[0024] [Ascorbic acids] Ascorbic acids act as reducing agents when preparing the mixture with the second agent, and are added to promote the oxidative polymerization reaction of the oxidative dye caused by the oxidizing agent. The mixture generates heat as the ascorbic acids undergo an oxidation-reduction reaction with the oxidizing agent, resulting in high hair dyeing power. Ascorbic acids are also added to lower the pH of the mixture over time. When the first and second agents containing ascorbic acids are mixed, the pH of the mixture gradually decreases over the course of the hair dyeing process due to the action of the ascorbic acids. This allows the mixture to achieve a sustained color development inhibition effect.

[0025] Ascorbic acids have a hydroxyl group, which contributes to the reducing power of ascorbic acids. Because ascorbic acids have a moderate reducing power, when the first and second agents are mixed, the alkaline agent is gradually neutralized, and the pH of the mixture can be lowered over time. As a result, color development of the mixture is suppressed.

[0026] Examples of ascorbic acids include ascorbic acid, erythorbic acid, salts or esters thereof, etc. Specific examples include ascorbic acid, sodium ascorbate, potassium ascorbate, calcium ascorbate, ammonium ascorbate, monoethanolamine ascorbate, diethanolamine ascorbate, erythorbic acid, sodium erythorbate, disodium ascorbate sulfate, magnesium ascorbate phosphate, ascorbyl palmitate, ascorbyl stearate, ascorbyl dipalmitate, ascorbyl tetra-2-hexyldecanoate, ascorbyl myristate, lauric acid ... Examples of the ascorbyl phosphate include ascorbyl acetate, ascorbyl propionate, ascorbyl tartrate, ascorbyl citrate, ascorbyl succinate, ascorbyl benzoate, potassium (ascorbyl / tocopheryl) phosphate, ethyl ascorbyl, allantoin ascorbate, chitosan ascorbate, methylsilanol ascorbate, tetradecylhexyl ascorbyl, aminopropyl ascorbyl phosphate, ascorbic acid polypeptide, ascorbyl glucoside, and ascorbyl methylsilanol pectinate. Among these, ascorbic acid and ascorbyl palmitate are preferred, ascorbyl stearate is preferred, and ascorbic acid and ascorbyl palmitate are more preferred. The ascorbic acid may contain only one of these, or a combination of two or more.

[0027] The lower limit of the content of ascorbic acids in the first agent is 1.0% by mass or more, preferably 1.5% by mass or more, more preferably 2.0% by mass or more, and even more preferably 3.0% by mass or more, calculated as ascorbic acid. The upper limit of the content is preferably 20% by mass or less, more preferably 16% by mass or less, even more preferably 12% by mass or less, and most preferably 8.0% by mass or less, calculated as ascorbic acid. The range of the content can be set by appropriately combining the above-mentioned upper and lower limits, and is, for example, 1.0% by mass or more and 20% by mass or less, or, for example, 1.5% by mass or more and 16% by mass or less, or, for example, 2.0% by mass or more and 12% by mass or less, or, for example, 3.0% by mass or more and 8.0% by mass or less.

[0028] The lower limit of the content of ascorbic acids relative to the total amount of the mixture, calculated as ascorbic acid, is preferably 0.5% by mass or more, more preferably 0.8% by mass or more, even more preferably 1.0% by mass or more, and most preferably 1.5% by mass or more. The upper limit of the content is preferably 10% by mass or less, more preferably 8.0% by mass or less, even more preferably 6.0% by mass or less, and most preferably 4.0% by mass or less. The range of the content can be set by appropriately combining the above-mentioned upper and lower limits, and is, for example, 0.5% by mass or more and 10% by mass or less, or, for example, 0.8% by mass or more and 8.0% by mass or less, or, for example, 1.0% by mass or more and 6.0% by mass or less, or, for example, 1.5% by mass or more and 4.0% by mass or less. If the content is within the above range, the redox reaction with the oxidizing agent is sufficiently promoted, making it easy to obtain a sustained heat-generating effect and a sufficient color development-inhibiting effect of the mixture.

[0029] [Higher alcohol] The higher alcohol is added to improve the viscosity of the first agent. By imparting an appropriate viscosity to the first agent, the higher alcohol can bring the first agent into a better emulsified state, thereby improving the storage stability of the first agent.

[0030] Examples of higher alcohols include cetyl alcohol (cetanol), 2-hexyldecanol, stearyl alcohol, isostearyl alcohol, cetostearyl alcohol, oleyl alcohol, arachyl alcohol, behenyl alcohol, 2-octyldodecanol, lauryl alcohol, myristyl alcohol, decyltetradecanol, and lanolin alcohol. Among these, linear alcohols are preferred, and cetyl alcohol and stearyl alcohol are particularly preferred. The higher alcohol may contain only one of these, or a combination of two or more.

[0031] The lower limit of the content of higher alcohol in the first agent is preferably 0.1% by mass or more, more preferably 1.0% by mass or more, even more preferably 2.0% by mass or more, even more preferably 4.0% by mass or more, even more preferably 8.0% by mass or more, and most preferably 9.0% by mass or more. The upper limit of the content is preferably 25% by mass or less, more preferably 20% by mass or less, even more preferably 18% by mass or less, even more preferably 16% by mass or less, even more preferably 14% by mass or less, and most preferably 12% by mass or less. The range of the content can be set by appropriately combining the above upper and lower limits, and is, for example, 0.1% by mass or more to 25% by mass or less, or, for example, 1.0% by mass or more to 20% by mass or less, or, for example, 2.0% by mass or more to 18% by mass or less, or, for example, 4.0% by mass or more to 16% by mass or less, or, for example, 8.0% by mass or more to 14.0% by mass or less, or, for example, 9.0% by mass or more to 12% by mass or less. If the content is within the above range, it is possible to impart an appropriate viscosity to the first agent, and it is possible to improve storage stability.

[0032] [Other ingredients] The first agent may contain other components such as surfactants, silicones, carbonates, and polymer compounds in appropriate combinations.

[0033] [Surfactants] Examples of surfactants include anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants. Anionic surfactants and nonionic surfactants can be blended to stably contain dye components, oily components, etc. in the first agent. That is, anionic surfactants and nonionic surfactants can be blended to improve the storage stability of the first agent. Amphoteric surfactants can be blended to improve the foaming of the mixture when the first agent is mixed with the second agent. In the following description, polyoxyethylene is abbreviated as "POE" and polyoxypropylene is abbreviated as "POP."

[0034] Examples of anionic surfactants include alkyl sulfates such as sodium cetyl sulfate, sodium myristyl sulfate, and sodium lauryl sulfate; POE alkyl sulfates such as sodium POE lauryl ether sulfate; alkyl sulfates such as triethanolamine lauryl sulfate; sodium stearoyl methyl taurate; triethanolamine dodecylbenzenesulfonate; sodium tetradecenesulfonate; POE lauryl ether phosphate and its salts. Among these, sodium cetyl sulfate, sodium myristyl sulfate, sodium lauryl sulfate, and sodium stearoyl methyl taurate are preferred. The anionic surfactant may contain only one of these, or a combination of two or more.

[0035] When an anionic surfactant is added, its content is not particularly limited. However, from the viewpoint of obtaining the above-mentioned effects, the lower limit of the content relative to the total amount of the first agent is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.5% by mass or more, even more preferably 1.0% by mass or more, and most preferably 2.0% by mass or more. The upper limit of the content is preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 10% by mass or less, even more preferably 8.0% by mass or less, and most preferably 6.0% by mass or less. The content range can be set by appropriately combining the above-mentioned upper and lower limits, and is, for example, 0.01% by mass or more to 20% by mass or less, for example, 0.1% by mass or more to 15% by mass or less, for example, 0.5% by mass or more to 10% by mass or less, for example, 1.0% by mass or more to 8.0% by mass or less, or for example, 2.0% by mass or more to 6.0% by mass or less.

[0036] Examples of cationic surfactants include lauryltrimethylammonium chloride, stearyltrimethylammonium chloride, alkyltrimethylammonium chloride, cetyltrimethylammonium chloride, distearyldimethylammonium chloride, cetyltrimethylammonium bromide, stearyltrimethylammonium bromide, lanolin ethyl sulfate fatty acid aminopropylethyldimethylammonium, stearyltrimethylammonium saccharin, and cetyltrimethylammonium saccharin.

[0037] Examples of nonionic surfactants include ether-type nonionic surfactants, ester-type nonionic surfactants, and alkyl glucosides.

[0038] Examples of ether-type nonionic surfactants include POE (5.5) cetyl ether (HLB value 10.5), POE (6) cetyl ether (HLB value 10.5), POE (6) cetyl ether (HLB value 10.5), POE (7) cetyl ether (HLB value 11.5), POE (10) cetyl ether (HLB value 13.5), POE (15) cetyl ether (HLB value 15.5), POE (20) cetyl ether (HLB value 17.0), POE (23) cetyl ether (HLB value 18.0), POE (25) cetyl ether (HLB value 18.5), PO POE cetyl ethers (ceteth) such as POE (30) cetyl ether (HLB value 19.5), POE (40) cetyl ether (HLB value 20.0), POE (2) cetyl ether (HLB value 8.0), POE (4) cetyl ether (HLB value 8.4), POE (5) cetyl ether (HLB value 9.5); POE (20) stearyl ether (HLB value 18.0), POE (150) stearyl ether (HLB value 19.2), POE (4) stearyl ether (HLB value 9.0), POE (5) stearyl ether (HLB value 9.0), POE (2) stearyl POE stearyl ether (steareth) such as ether (HLB value 8.0); POE (10) behenyl ether (HLB value 10.0), POE (20) behenyl ether (HLB value 16.5), POE (30) behenyl ether (HLB value 18.0), POE (150) behenyl ether (HLB value 19.1), POE (2) behenyl ether (HLB value 4.3), POE (3) behenyl ether (HLB value 5.8), POE (5) behenyl ether (HLB value 7.0), POE (6) behenyl ether (HLB value 8.9) and other POE behenyl ethers ( Beheneth; POE (7) oleyl ether (HLB value 10.5), POE (10) oleyl ether (HLB value 14.5), POE (15) oleyl ether (HLB value 16.0), POE (20) oleyl ether (HLB value 17.0), POE (50) oleyl ether (HLB value 18.0), POE (2) oleyl ether (HLB value 4.9), POE (3) oleyl ether (HLB value 6.6), etc. POE oleyl ethers (oleths); POE (4.2) lauryl ether (HLB value 11.5), POE (9) lauryl ether (HLB value 14.5), POE (10) lauryl ether (HLB value 14.5), POE (21) lauryl ether (HLB value 19.0), POE (25) lauryl ether (HLB value 19.5), POE (2) lauryl ether (HLB value 9.5), POE (3) lauryl ether (HLB value 8.4) and other POE lauryl ethers (laureth); POE (2) myristyl ether (HLB value 5.8), POE (3) myristyl ether (HLB value 7.7) and other POE myristyl ethers; POE (2) octyldodecyl ether (HLB value 4.6), POE (5) octyldodecyl ether (HLB value 8.5) and other POE octyldodecyl ethers; POE (2) hexyldecyl ether (HLB value 5.3), POE (4) hexyl Examples include POE hexyldecyl ethers such as POE (5) isostearyl ether (HLB value 7.0), POE isostearyl ethers such as POE nonylphenyl ether, POE octylphenyl ether, POE polyoxypropylene cetyl ethers such as POE (10) POP (4) cetyl ether (HLB value 10.5), POE (20) POP (4) cetyl ether (HLB value 16.5), POE (20) POP (8) cetyl ether (HLB value 12.5), and POE (1) POP (4) cetyl ether (HLB value 9.5); and POE polyoxypropylene decyl tetradecyl ethers such as POE (12) POP (6) decyl tetradecyl ether (HLB value 8.5).

[0039] The numbers in parentheses following the POE and POP notations indicate the number of moles of POE and POP added in each compound. The HLB values ​​of each compound are listed as reference values, such as those listed in the Nikko Chemicals catalog (2014). These HLB values ​​can be measured according to "20·3·1 Measurement of HLB Values ​​by Emulsification Method" (pp. 854-855) in the "Handbook - Cosmetics and Pharmaceutical Ingredients - Revised Edition (Namitaka, March 1, 1978, Nikko Chemicals Co., Ltd.)."

[0040] Examples of ester-type nonionic surfactants include POE sorbitan fatty acid esters such as POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan monopalmitate, POE sorbitan monolaurate, and POE sorbitan trioleate; glyceryl monofatty acid esters such as POE glycerol monostearate and POE glycerol monomyristate; and POE sorbitol fatty acid esters such as POE sorbitan tetraoleate, POE sorbitan hexastearate, and POE sorbitan monolaurate. The number of moles of POE added in POE sorbitan fatty acid esters and monoglyceryl monofatty acid esters is, for example, 5 or more. The number of moles of POE added in POE sorbitol fatty acid esters is, for example, 6 or more. Other ester-type nonionic surfactants include sorbitan beeswax such as POE(6)POE sorbitan beeswax, polyethylene glycol monooleate, polyethylene glycol monostearate, polyethylene glycol monolaurate, lipophilic glyceryl monooleate, lipophilic glyceryl monostearate, self-emulsifying glyceryl monostearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate, sorbitan monostearate, sorbitan monopalmitate, sorbitan monolaurate, sucrose fatty acid esters, decaglyceryl monolaurate, decaglyceryl monostearate, decaglyceryl monooleate, decaglyceryl monomyristate, and POE reduced lanolin.

[0041] As the nonionic surfactant, ether-type nonionic surfactants are preferred, and among them, POE(4) cetyl ether, POE(30) cetyl ether, POE(2) stearyl ether, POE(4) stearyl ether, and POE(50) oleyl ether are preferred. The nonionic surfactant may contain only one of these, or may contain a combination of two or more.

[0042] When a nonionic surfactant is added, its content is not particularly limited. However, from the viewpoint of obtaining the above-mentioned effects, the lower limit of the content relative to the total amount of the first agent is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 1.0% by mass or more, even more preferably 2.0% by mass or more, and most preferably 3.0% by mass or more. The upper limit of the content is preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 10% by mass or less, even more preferably 8.0% by mass or less, and most preferably 6.0% by mass or less. The content range can be set by appropriately combining the above-mentioned upper and lower limits, and is, for example, 0.01% by mass or more to 20% by mass or less, for example, 0.1% by mass or more to 15% by mass or less, for example, 0.5% by mass or more to 10% by mass or less, for example, 1.0% by mass or more to 8.0% by mass or less, or for example, 2.0% by mass or more to 6.0% by mass or less.

[0043] Examples of amphoteric surfactants include amino acid type amphoteric surfactants and betaine type amphoteric surfactants.

[0044] Examples of amino acid type amphoteric surfactants include alkyldiaminoethylglycine hydrochloride, N-coconut oil fatty acid acyl-N'-carboxyethyl-N'-hydroxyethylethylenediamine sodium, N-coconut oil fatty acid acyl-N'-carboxyethoxyethyl-N'-carboxyethylethylenediamine disodium, palm oil fatty acid acyl-N-carboxyethyl-N-hydroxyethylethylenediamine sodium, sodium laurylaminopropionate, sodium laurylaminodipropionate, and triethanolamine laurylaminopropionate.

[0045] Examples of betaine-type amphoteric surfactants include coconut oil alkyl betaine, lauryl dimethyl aminoacetic acid betaine, myristyl dimethyl aminoacetic acid betaine, stearyl dimethyl aminoacetic acid betaine, sodium stearyl dimethyl betaine, coconut oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, and lauryl hydroxysulfobetaine.

[0046] Among these, betaine-type amphoteric surfactants are preferred, and among these, lauric acid amphoteric propyl betaine is preferred. The amphoteric surfactant may contain only one of these, or may contain a combination of two or more.

[0047] When an amphoteric surfactant is added, its content is not particularly limited. However, from the viewpoint of obtaining the above-mentioned effects, the lower limit of the content relative to the total amount of the first agent is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.5% by mass or more, even more preferably 1.0% by mass or more, and most preferably 2.0% by mass or more. The upper limit of the content is preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 10% by mass or less, even more preferably 8.0% by mass or less, and most preferably 6.0% by mass or less. The content range can be set by appropriately combining the above-mentioned upper and lower limits, and is, for example, 0.01% by mass or more to 20% by mass or less, for example, 0.1% by mass or more to 15% by mass or less, for example, 0.5% by mass or more to 10% by mass or less, for example, 1.0% by mass or more to 8.0% by mass or less, or for example, 2.0% by mass or more to 6.0% by mass or less.

[0048] [silicone] Silicones may be blended in for the purposes of making hair treated with the present oxidation hair dye composition supple and improving its feel. Examples of silicones include dimethylpolysiloxane (dimethicone), methylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, terminal hydroxyl group-modified dimethylpolysiloxane, highly polymerized silicones having an average degree of polymerization of 650 to 10,000, polyether-modified silicones, amino-modified silicones, betaine-modified silicones, alkyl-modified silicones, alkoxy-modified silicones, carboxy-modified silicones, and fluorine-modified silicones.

[0049] Examples of amino-modified silicones include aminopropylmethylsiloxane-dimethylsiloxane copolymer (aminopropyl dimethicone), aminoethylaminopropylsiloxane-dimethylsiloxane copolymer (amodimethicone), and aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer (trimethylsilyl amodimethicone).

[0050] Among these, dimethylpolysiloxane, methylpolysiloxane, and aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer are preferred. The silicone may contain only one of these, or a combination of two or more.

[0051] When silicone is added, its content is not particularly limited, but from the viewpoint of obtaining the above-mentioned effects, the lower limit of the content relative to the total amount of the first agent is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 1.0% by mass or more, even more preferably 2.0% by mass or more, and most preferably 5.0% by mass or more. The upper limit of the content is preferably 40% by mass or less, more preferably 30% by mass or less, even more preferably 20% by mass or less, even more preferably 15% by mass or less, and most preferably 10% by mass or less. The range of the content can be set by appropriately combining the above-mentioned upper and lower limits, and is, for example, 0.1% by mass or more to 40% by mass or less, for example, 0.2% by mass or more to 30% by mass or less, for example, 1.0% by mass or more to 20% by mass or less, for example, 2.0% by mass or more to 15% by mass or less, or for example, 5.0% by mass or more to 10% by mass or less.

[0052] [Carbonate] Carbonates can be added to the first and second agents to cause foaming when the mixture is mixed. Chemical foaming requires placing the carbonate in an acidic environment after mixing the first and second agents. However, the second agent generally has a low pH, which can lead to carbonate reactions, making it difficult to incorporate carbonates into the second agent. Furthermore, when an acidic substance is added to the first agent along with a carbonate, the pH of the first agent tends to decrease, resulting in poor storage stability. Adding an acidic substance to the first agent without significantly lowering the pH of the first agent allows the carbonate and the acidic substance to coexist in the first agent. However, in this case, even when the first agent is mixed with a second agent that does not contain an acidic substance, the pH of the mixture is unlikely to decrease, making it difficult to foam the mixture. Furthermore, as will be described later, when a carbonate is added to the first agent and an acidic substance is added to the second agent, foaming occurs after mixing, but maintaining the foaming is difficult. In contrast, when the present oxidation hair dye composition contains a carbonate, an ascorbic acid or similar compound is blended into the first agent together with the carbonate. The ascorbic acid or similar compound is gradually oxidatively decomposed by reacting with the oxidizing agent contained in the second agent, producing acidic substances (e.g., oxalic acid, threonic acid, etc.) over time, gradually lowering the pH of the mixture. The carbonate reacts with the acidic substances that are subsequently produced to produce carbon dioxide gas. Thus, in the present oxidation hair dye composition, the first agent containing the carbonate and the ascorbic acid or similar compound is mixed with the second agent containing the oxidizing agent, causing self-foaming through a reaction that generates carbon dioxide gas, thereby providing a foamy mixture. Furthermore, in the present oxidation hair dye composition, carbon dioxide gas is produced over a long period of time after mixing the first agent and the second agent, resulting in a mixture with good foam retention. This improves the applicability of the mixture to hair and reduces color unevenness when the mixture is applied to hair. As described above, the inventors have discovered that by including an ascorbic acid together with a carbonate in the first agent, an acidic substance is generated after mixing, even when a second agent that does not contain an acidic substance is used, thereby achieving a foaming effect. Note that the technology disclosed in this specification is not intended to exclude embodiments in which the second agent contains an acidic substance. The first agent may contain an ascorbic acid and a carbonate, and then the second agent may contain an acidic substance.

[0053] Examples of carbonates include alkali metal salts such as potassium salts and sodium salts of carbonate ions or hydrogen carbonate ions, alkaline earth metal salts such as beryllium salts, magnesium salts and calcium salts, and ammonium salts. Among these, ammonium hydrogen carbonate and sodium carbonate are preferred. The carbonate may contain only one of these or a combination of two or more thereof.

[0054] When a carbonate is added, its content is not particularly limited, but from the viewpoint of obtaining the above-mentioned effects, the lower limit of the content relative to the total amount of the first agent is preferably 5.0% by mass or more, more preferably 10% by mass or more, even more preferably 15% by mass or more, and most preferably 20% by mass or more. The upper limit of the content is preferably 50% by mass or less, more preferably 40% by mass or less, even more preferably 35% by mass or less, and most preferably 30% by mass or less. The range of the content can be set by appropriately combining the above-mentioned upper and lower limits, and is, for example, 5.0% by mass or more and 50% by mass or less, for example, 10% by mass or more and 40% by mass or less, for example, 15% by mass or more and 35% by mass or less, or for example, 20% by mass or more and 30% by mass or less.

[0055] [High molecular compound] The polymer compound can be blended to give the first agent an appropriate viscosity, maintain the stability of the first agent, and impart softness and a moisturizing feel to the hair.

[0056] Examples of polymer compounds include natural polymer compounds such as gum arabic, carrageenan, galactan, guar gum, quince seed gum, locust bean gum, tragacanth gum, pectin, mannan, starch, xanthan gum, dextran, hyaluronic acid, curdlan, succinoglucan, gelatin, collagen, casein, and albumin; cellulose-based polymer compounds such as methylcellulose, ethylcellulose, hydroxyethylcellulose, sodium carboxymethylcellulose, and methylhydroxypropylcellulose; starch-based polymer compounds such as carboxymethyl starch, methyl starch, and soluble starch; alginic acid-based polymer compounds such as alginate and propylene glycol alginate; polyacrylic acid; Examples of suitable polymers include synthetic polymers such as acrylic acid, sodium polyacrylate, polyacrylic acid amide, polydimethylmethylenepiperidinium chloride, highly polymerized polyethylene glycol, polyethyleneimine, acrylic acid-alkyl methacrylate copolymers, and carboxyvinyl polymers; inorganic substances such as bentonite, montmorillonite, and magnesium aluminum silicate; cationic cellulose derivatives such as O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethyl cellulose chloride; cationic starch, cationized guar gum, polymers or copolymers of diallyl quaternary ammonium salts; cationic polymers such as quaternized polyvinylpyrrolidone; and amphoteric polymers such as dimethyldiallylammonium chloride-acrylamide copolymers. Among these, synthetic polymers, cationic polymers, and amphoteric polymers are preferred, with carboxyvinyl polymers, O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethyl cellulose chloride, acrylic acid-alkyl methacrylate copolymers, and dimethyldiallylammonium chloride-acrylamide copolymers being particularly preferred. The polymers may contain only one of these or a combination of two or more of them.

[0057] When a polymer compound is blended, its content is not particularly limited. However, from the viewpoint of obtaining the above-mentioned effects, the lower limit of the content relative to the total amount of the first agent is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, even more preferably 1.5% by mass or more, even more preferably 2.0% by mass or more, and most preferably 2.5% by mass or more. The upper limit of the content is preferably 10% by mass or less, more preferably 8.0% by mass or less, even more preferably 6.0% by mass or less, even more preferably 5.0% by mass or less, and most preferably 4.0% by mass or less. The content range can be set by appropriately combining the above-mentioned upper and lower limits, and is, for example, 0.5% by mass or more to 10% by mass or less, for example, 1.0% by mass or more to 8.0% by mass or less, for example, 1.5% by mass or more to 6.0% by mass or less, for example, 2.0% by mass or more to 5.0% by mass or less, or for example, 2.5% by mass or more to 4.0% by mass or less.

[0058] The other components described above can be contained in any combination as long as they do not impair the properties and effects of the first agent, but it is preferable that the first agent contain any combination of silicone in addition to the anionic surfactant and nonionic surfactant among the other components described above. In this case, the anionic surfactant preferably has a carbon chain having 10 or more carbon atoms, more preferably 12 or more carbon atoms, even more preferably 14 or more carbon atoms, even more preferably 16 or more carbon atoms, and most preferably 18 or more carbon atoms. By containing an anionic surfactant and a nonionic surfactant with a relatively large number of carbon atoms, the storage stability of the first agent can be improved, and if the first agent further contains silicone, the feel of the hair after treatment can be improved.

[0059] Furthermore, the first agent preferably contains any combination of carbonates and polymeric compounds in addition to the anionic surfactants, nonionic surfactants, and amphoteric surfactants among the other components described above. When the first agent contains carbonates, the mixture foams when the first agent and the second agent are mixed due to the mechanism described above, improving the ease of application to hair and reducing color unevenness when applied to hair. Furthermore, by including each surfactant, foaming and foam retention can be improved. Furthermore, when the first agent further contains a polymeric compound, more suitable stability of the first agent can be ensured.

[0060] [Second agent] The second agent contains an oxidizing agent.

[0061] [Oxidizing agent] The oxidizing agent oxidatively polymerizes the oxidation dye to develop color and bleaches melanin contained in the hair. Examples of the oxidizing agent include hydrogen peroxide, urea peroxide, melamine peroxide, sodium percarbonate, potassium percarbonate, sodium perborate, potassium perborate, sodium peroxide, potassium peroxide, magnesium peroxide, barium peroxide, calcium peroxide, strontium peroxide, hydrogen peroxide adducts of sulfates, hydrogen peroxide adducts of phosphates, and hydrogen peroxide adducts of pyrophosphates.

[0062] The oxidizing agent may contain only one of these or a combination of two or more of them. Among these, hydrogen peroxide is preferably used from the viewpoint of its excellent ability to oxidatively polymerize the oxidation dye and cause color development.

[0063] The content of the oxidizing agent in the second agent is not particularly limited, but is preferably 0.1% by mass to 30% by mass, more preferably 0.3% by mass to 25% by mass, and even more preferably 0.5% by mass to 20% by mass. If the content is within the above range, the oxidation dye can be easily oxidatively polymerized sufficiently and the feel of the hair is less likely to deteriorate.

[0064] The second agent may contain a suitable combination of higher alcohols and the components (ie, surfactants, silicones, polymer compounds) described above as other components in the first agent.

[0065] Furthermore, the first and second agents may further contain other ingredients selected appropriately, as long as they do not impair the properties and effects of the composition, such as oily ingredients (excluding higher alcohols and silicones), pH adjusters (excluding ascorbic acids), hydrocarbons, chelating agents, etc. Each of the first and second agents may contain only one of these, or a combination of two or more.

[0066] [Oily ingredients] The oily component may be blended to make the hair supple. The oily component may also be blended to make the first and second agents into the desired formulation. Examples of oily components include fats and oils, waxes, polyhydric alcohols, higher fatty acids, alkyl glyceryl ethers, and esters.

[0067] Examples of fats and oils include lanolin, olive oil, camellia oil, shea butter, almond oil, safflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, corn oil, rapeseed oil, rice bran oil, rice germ oil, grape seed oil, avocado oil, macadamia nut oil, castor oil, coconut oil, and evening primrose oil.

[0068] Waxes include, for example, beeswax, candelilla wax, carnauba wax, jojoba oil, and lanolin.

[0069] Examples of polyhydric alcohols include glycols, glycerins, and alicyclic polyols. Examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, and 1,3-butylene glycol. Examples of glycerins include glycerin, diglycerin, and polyglycerin. Examples of alicyclic polyols include cyclopentane polyols and cyclohexane polyols such as inositol.

[0070] Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, 12-hydroxystearic acid, oleic acid, and lanolin fatty acids.

[0071] Alkyl glyceryl ethers include, for example, batyl alcohol, chimyl alcohol, selachyl alcohol, and isostearyl glyceryl ether.

[0072] Examples of esters include diisopropyl adipate, isopropyl myristate, cetyl octanoate, isononyl isononanoate, octyldodecyl myristate, isopropyl palmitate, stearyl stearate, myristyl myristate, isotridecyl myristate, 2-ethylhexyl palmitate, octyldodecyl ricinoleate, cholesteryl / lanosteryl fatty acids having 10 to 30 carbon atoms, cetyl lactate, lanolin acetate, ethylene glycol 2-ethylhexanoate, pentaerythritol fatty acid esters, dipentaerythritol fatty acid esters, cetyl caprate, glyceryl tricaprylate, diisostearyl malate, dioctyl succinate, and cetyl 2-ethylhexanoate.

[0073] [pH adjuster] A pH adjuster may be contained to adjust the pH of the agent, and examples of the pH adjuster include citric acid, phosphoric acid, acetic acid, hydrochloric acid, sulfuric acid, nitric acid, succinic acid, levulinic acid, and salts thereof.

[0074] [Hydrocarbons] Examples of hydrocarbons include liquid paraffin, liquid isoparaffin, paraffin, olefin oligomer, polyisobutene, hydrogenated polyisobutene, synthetic squalane, squalene, squalane (hydrogenated squalene), polybutene, polyethylene, microcrystalline wax, petrolatum, ozokerite, and ceresin.

[0075] [Chelating agent] Examples of chelating agents include ethylenediaminetetraacetic acid (EDTA, edetic acid) and its salts, hydroxyethylethylenediaminetriacetic acid (HEDTA) and its salts, diethylenetriaminepentaacetic acid (DTPA) and its salts, and hydroxyethanediphosphonic acid (HEDP, etidronic acid) and its salts.

[0076] Furthermore, the first and second agents may contain, as necessary, antioxidants such as anhydrous sodium sulfite, preservatives such as phenoxyethanol and sodium benzoate, direct dyes such as basic dyes, nitro dyes, natural dyes, and disperse dyes, organic solvents such as ethanol and glycol, sugars such as sorbitol and maltose, stabilizers such as phenacetin, 8-hydroxyquinoline, acetanilide, sodium pyrophosphate, barbituric acid, uric acid, and tannic acid, inorganic salts such as sodium chloride and sodium carbonate, plant extracts, herbal extracts, vitamins, fragrances, and ultraviolet absorbers, as well as at least one selected from those listed in the "Standards for Quasi-drug Raw Materials" (published in June 2006 by Yakuji Nipposha).

[0077] [Dosage form] The dosage forms of the first and second agents are not particularly limited, but examples thereof include aqueous solutions, dispersions, emulsions, gels, foams, and creams. When the dosage form is an emulsion, it may be either an oil-in-water type or a water-in-oil type, but is preferably an oil-in-water type.

[0078] [Mixture] The mixture is obtained by mixing and preparing the first and second agents in a predetermined ratio. The mixing ratio of the first and second agents is not particularly limited, but for example, the mass ratio of the first agent:the second agent is 1:0.5 to 1:5. Within this mixing ratio range, it is easy to set the content of each component in the first agent and the second agent. The mixture may further contain an agent other than the first and second agents.

[0079] [Mixture temperature] As described above, in the present oxidation hair dye composition, when the first and second parts are mixed, the reducing power of ascorbic acids acts on the oxidizing agent, causing the mixture to generate heat. Specifically, in the present oxidation hair dye composition, when the temperature of each of the first and second parts before mixing is 25°C, the temperature of the mixture is 27°C or higher from 10 minutes to at least 30 minutes after mixing. In other words, the temperature of the mixture from 10 minutes to at least 30 minutes after mixing is 2°C or higher than the temperatures of the first and second parts before mixing. For example, the temperatures of the mixture 10 minutes, 20 minutes, and 30 minutes after mixing are all 27°C or higher. The temperature of the mixture from 10 minutes to at least 30 minutes after mixing may be, for example, 28°C or higher, or 29°C or higher. In this way, the temperature of the mixture is continuously elevated after mixing, thereby achieving high hair dyeing power. Furthermore, in the present oxidation hair dye composition, when the temperatures of the first and second parts before mixing are each 25° C., the temperature of the mixture from 10 minutes to at least 30 minutes after mixing is, for example, 40° C. or lower, for example, 37.5° C. or lower, or for example, 35° C. If the temperature of the mixture is 40° C. or lower, color development of the mixture can be suitably suppressed.

[0080] [Method of using the oxidation hair dye composition] As described above, in this embodiment, the ascorbic acid or a compound thereof is contained in the first agent. Therefore, similar to conventional oxidative hair dye compositions, the oxidative hair dye composition is used by mixing a first agent containing an oxidative dye, an alkaline agent, and an ascorbic acid or a compound thereof with a second agent containing an oxidizing agent to prepare a mixture, and applying the mixture to hair. This method of use may be used to suppress the color development of such an oxidative hair dye composition.

[0081] The first and second agents may be mixed by an appropriate method depending on the formulation. For example, if the formulation is a cream, they may be mixed on a plate using a mixer such as a brush. Alternatively, the first and second agents may be supplied to a comb, applied directly to the hair, and then mixed on the hair using the comb. For example, if the formulation is an aqueous solution or emulsion, the first and second agents may be placed in a container and mixed by shaking, or may be placed in a non-aerosol foamer container and mixed to form a foam. [Example]

[0082] Next, the present invention will be described in more detail with reference to examples and comparative examples, although the present invention is not limited to the examples described below.

[0083] (Examples 1 to 38, Comparative Examples 1 to 5) In each example, a first agent and a second agent were each prepared by mixing the components shown in Tables 1 to 5. The numerical values ​​in the columns showing each component in Tables 1 to 5 indicate the content of the component in that column in the agent, and the units are % by mass.

[0084] [Table 1]

[0085] [Table 2]

[0086] [Table 3]

[0087] [Table 4]

[0088] [Table 5]

[0089] <Evaluation of temperature changes> The first and second parts prepared in each example were placed in a thermostatic bath at 25°C and the temperature was adjusted to 25°C. Next, 10g of the thermostatically adjusted first part and 10g of the second part were mixed using a brush to prepare a 20g mixture. After mixing, each mixture was placed in a thermostatic bath at 25°C, and the temperature of the mixture was measured 10 minutes, 20 minutes, and 30 minutes after mixing. The temperature change of the mixture was evaluated based on the following criteria. The results are shown in Tables 1 to 5. 5: The temperature at each measurement time is 29°C or higher. 4: The temperature at each measurement time was 28°C or higher (excluding rating 5). 3: The temperature at each measurement time was 27°C or higher (excluding ratings 4 and 5). 2: The temperature at each measurement time was 26°C or higher (excluding ratings 3 to 5). 1: Any of the temperatures at each measurement time was below 26°C (excluding ratings 2 to 5).

[0090] <Evaluation of color development inhibition of the agent> The first and second agents prepared in each example were mixed in a 1:1 ratio to prepare a mixture. After allowing the mixture to stand for 20 minutes, five expert panelists visually inspected the mixture to assess whether color development was suppressed. For Tables 1 to 3 (Examples 1 to 24 and Comparative Examples 1 to 4), the mixture of Comparative Example 1 was left standing for 20 minutes as a control, and the mixture in each example was compared to the control to assess whether color development was suppressed. For Tables 4 and 5 (Examples 25 to 38 and Comparative Examples 5 to 8), the mixture of Comparative Example 5 was left standing for 20 minutes as a control, and the mixture in each example was compared to the control to assess whether color development was suppressed. The evaluation results were either "Suppressed" or "Equivalent or Greater Color Development" compared to the corresponding control. A sample in which more than half of the panelists assessed color development as suppressed was given an "O" and a sample in which more than half of the panelists assessed color development as equivalent or greater was given an "X." The results are shown in Tables 1 to 5.

[0091] <Evaluation of storage stability of the first agent> 30 g of the first formulations prepared in Examples 1 to 24 and Comparative Examples 1 to 4 (Tables 1 to 3) were weighed into No. 4 standard bottles, and the bottles were then fitted with inner lids and lids. The viscosities were measured and recorded as the initial viscosities. A storage test was then conducted by allowing the formulations to stand for 24 hours at 55°C and 60°C. Each first formulation was then allowed to stand for 24 hours at 25°C, and the viscosities were measured and recorded as the final viscosities. Evaluation was conducted according to the following criteria. For formulations in which separation was observed during the storage test (i.e., emulsions separated into an oil layer and an aqueous layer), the final viscosities were not measured. Viscosities were measured at 25°C using a B-type viscometer (TV-10, manufactured by Toki Sangyo Co., Ltd.). The results are shown in Tables 1 to 3. ◎: No separation occurred in the storage tests at both 55°C and 60°C, and the viscosity at the end of storage did not decrease from the viscosity at the start of storage. ○: Separation did not occur in the storage test at 55°C but occurred in the storage test at 60°C, or separation did not occur in either storage test, but the viscosity at the end of storage at 60°C was lower than the viscosity at the start of storage. ×: Separation occurred during both storage tests at 55°C and 60°C.

[0092] <Evaluation of texture> The first and second agents prepared in Examples 1 to 24 and Comparative Examples 1 to 4 (Tables 1 to 3) were mixed in a 1:1 ratio, and 2 g of the mixture was applied to 1 g of a 10 cm long evaluation hair bundle (manufactured by Beaulux Co., Ltd.) using a brush and left to stand at 30°C for 30 minutes. The mixture on the hair bundle was then rinsed with water, washed with shampoo (Bigen Treatment Shampoo manufactured by Hoyu Co., Ltd.), and dried with warm air to prepare an evaluation sample. Five expert panelists evaluated the feel of each evaluation sample according to the following criteria. The feel of the hair bundle was scored on a five-point scale: excellent (5 points), good (4 points), fair (3 points), somewhat poor (2 points), and poor (1 point), and the average score of each panelist's scores was calculated. The evaluation results were as follows: an average score of 3.5 points or more was marked "◎", an average score of 2.5 points or more but less than 3.5 points was marked "○", and an average score of less than 2.5 points was marked "×". The results are shown in Tables 1 to 3.

[0093] <Evaluation of foam maintenance> 30 g of the first and second parts prepared in Examples 25 to 38 and Comparative Examples 5 to 8 (Tables 4 and 5) were mixed in a 500 ml beaker. Five expert panelists visually inspected each mixture to evaluate whether it foamed and its foam retention (i.e., whether foam was maintained). The mixture of Comparative Example 8 served as a control, and the foam characteristics of each example were compared with the control and scored according to the following criteria. The panelists' scores were then averaged, and the average was rounded to the nearest whole number to obtain the score. The results are shown in Tables 4 and 5. 5: The foam lasted 30 minutes longer than the control. 4: The foam lasted for 20 minutes or more but less than 30 minutes longer than the control. 3: The foam lasted longer than the control (except for ratings 4 and 5) 2: The foam retention was equal to or less than the control. 1: No foaming

[0094] As shown in Tables 1 to 5, Examples 1 to 38 exhibited favorable temperature change and favorable color development suppression effects. First, examining the components (A) and (a) in Tables 1 to 5, Comparative Examples 1, 5 to 8 did not contain component (A) (ascorbic acids). This is thought to be due to the low reducing power of the first agent, which prevented the generation of heat due to the oxidation-reduction reaction with the oxidizing agent and the suppression of color development of the mixture due to neutralization of the alkaline agent. Furthermore, in Comparative Examples 2 and 6, sodium sulfite was used as component (a) instead of component (A). Because sodium sulfite has low reducing power, slight heat generation was observed after mixing, but it was difficult to maintain a high temperature, resulting in a low evaluation of temperature change. Furthermore, in Comparative Examples 3 and 7, potassium iodide was used as component (a) instead of component (A). In Comparative Examples 3 and 7, the addition of potassium iodide allowed the mixture to maintain a high temperature, but did not suppress color development of the mixture. Furthermore, a comparison of Examples 1 to 3, which differ only in the content of ascorbic acids, and a comparison of Examples 25 to 27 revealed that a relatively high content of ascorbic acids resulted in a better temperature change.

[0095] Next, considering the component (B) (i.e., higher alcohol) in Tables 1 to 3, Comparative Example 4, in which the first agent did not contain a higher alcohol, resulted in a low evaluation of temperature change despite the inclusion of ascorbic acids. As described above, higher alcohols contribute to improving the viscosity of the first agent. In each Example in which a higher alcohol was contained, the viscosity of the first agent was relatively high, resulting in a high viscosity of the mixture. This is thought to have suppressed the Brownian motion of the particles in the mixture, making it difficult for the mixture to dissipate heat, resulting in good temperature change (i.e., high temperature maintenance). Furthermore, in each Example, the incorporation of a higher alcohol in the first agent caused the mixture to form a good emulsion, thereby reducing the heat of vaporization. This is thought to have made it difficult for the temperature of the mixture to drop, improving the effect of maintaining a high temperature. Furthermore, in Comparative Example 4, the agent separated during the storage test compared to Example 1, resulting in poor storage stability. In contrast, in each Example in which a higher alcohol was contained in the first agent, the first agent was well emulsified, which is thought to have improved the storage stability of the first agent. Furthermore, a comparison of Examples 1, 4, and 5, which differ only in the content of higher alcohol, shows that a relatively high content of higher alcohol results in better storage stability.

[0096] Next, examining component (C) (i.e., anionic surfactant) in Tables 1 to 3, comparing Examples 1 and 11, which differ only in the presence or absence of an anionic surfactant, it was found that Example 1, which contained an anionic surfactant, exhibited higher storage stability than Example 11. As described above, the anionic surfactant contributes to stably incorporating dye components, oily components, and the like into the first agent, and therefore it is believed that each Example containing an anionic surfactant exhibited better storage stability than Example 11. Furthermore, comparing Examples 1, 8, and 10, which contain different types of anionic surfactant, it was found that Example 10, which contained sodium lauryl sulfate as the anionic surfactant, did not exhibit particularly high storage stability. This is believed to be due to the influence of the carbon chain of the anionic surfactant. Sodium lauryl sulfate has a carbon chain length of 12 carbon atoms, while the other anionic surfactants have carbon chains with 14 or more carbon atoms. These results demonstrate that anionic surfactants with a relatively large number of carbon atoms in their carbon chains improve the storage stability of the first agent. Furthermore, a comparison of Examples 1, 6 and 7, which differ only in the content of the anionic surfactant, shows that compositions containing a relatively large amount of anionic surfactant exhibit better storage stability.

[0097] Next, examining component (D) (i.e., nonionic surfactant) in Tables 1 to 3, comparing Examples 1 and 19, which differ only in the presence or absence of a nonionic surfactant, it was found that Example 1, which contained a nonionic surfactant, exhibited higher storage stability than Example 19. Similar to anionic surfactants, nonionic surfactants contribute to the stable incorporation of dye components, oily components, and the like into the first agent. Therefore, it is believed that each Example containing a nonionic surfactant exhibited better storage stability than Example 19. Furthermore, Examples 12 to 18, which differ from Example 1 only in the content or type of nonionic surfactant, all exhibited good storage stability. In other words, it can be seen that the inclusion of a nonionic surfactant improves the storage stability of the first agent.

[0098] Next, examining component (E) (i.e., silicone) in Tables 1 to 3, each example containing silicone resulted in a better feel of the hair after treatment compared to Example 24, which did not contain silicone. As mentioned above, silicone makes the hair supple after treatment, contributing to an improved feel of the hair. For this reason, it is believed that each example containing silicone resulted in a better feel than Example 24. Furthermore, Examples 20 to 23, which differ from Example 1 only in the content or type of silicone, all resulted in a better feel. In other words, it can be seen that the inclusion of silicone improves the feel of the hair.

[0099] Next, examining component (F) (i.e., carbonate) in Tables 4 and 5, a comparison of Examples 25, 29, and 30, which differ only in carbonate content, reveals that a relatively high carbonate content exhibits a longer foaming effect over time. This is thought to be because carbonate is the source of carbon dioxide gas generated when the first and second agents are mixed, and the higher the carbonate content, the longer it takes for the carbonate to be consumed, allowing carbon dioxide gas to be generated over a longer period of time. Regarding foaming maintenance, as shown in Examples 25 to 27, the higher the ascorbic acid content, the greater the effect. As mentioned above, ascorbic acids are gradually decomposed by an oxidizing agent when the first and second agents are mixed, they generate acidic substances over time. Therefore, it is thought that in Examples containing a large amount of ascorbic acids, the acidic substances available for reaction with carbonate were generated over a longer period of time, resulting in better foam retention. In contrast, Comparative Examples 5 to 7 contain carbonate but no ascorbic acids. As a result, the mixture either did not foam or foamed but quickly defoamed. In Comparative Example 8, instead of the component (A) in the first agent, the second agent contained a large amount of phosphoric acid (5.0% by mass). Therefore, when the first and second agents were mixed, the carbonate reacted with the phosphoric acid to cause foaming. However, in Comparative Example 8, the carbonate was consumed in a short time by the reaction with the phosphoric acid, which is thought to have resulted in a lower foam maintenance effect compared to the other Examples. It is possible to include a strong acid in the first agent together with the carbonate to prevent the mixture from defoaming, but this may cause the carbonate to react with the strong acid during storage of the first agent, resulting in a lack of storage stability. Therefore, when the goal is to provide a foamy mixture through self-foaming, including an ascorbic acid in the first agent together with the carbonate, as in the Examples, is effective in maintaining the foaming of the mixture.

[0100] Next, when component (H) (i.e., polymer compound) in Tables 4 and 5 was examined, it was found that the foaming effect over time could be obtained by including a polymer compound, regardless of the type or content of the polymer compound, as shown in Examples 34 to 38. Furthermore, the above-mentioned effects could also be obtained by including components (C), (D), and (G) in Tables 4 and 5 (anionic surfactant, nonionic surfactant, and amphoteric surfactant) in the first agent.

[0101] Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. The technical elements described in this specification or drawings exhibit technical utility either alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technology exemplified in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives is itself technically useful.

Claims

1. An oxidation hair dye composition comprising a first agent containing an oxidation dye and an alkaline agent and a second agent containing an oxidizing agent, The first agent is 1.0% by mass or more of ascorbic acids in terms of ascorbic acid; and a higher alcohol, Oxidative hair dye composition.

2. The first agent further comprises an anionic surfactant having a carbon chain having 14 or more carbon atoms; The oxidation hair dye composition according to claim 1, further comprising a nonionic surfactant.

3. The first agent further comprises The oxidative hair dye composition according to claim 2, which contains a silicone.

4. The first agent is The higher alcohol is contained in an amount of 4.0% by mass or more, The anionic surfactant is contained in an amount of 0.5% by mass or more, The oxidation hair dye composition according to claim 2 or 3, comprising 1.0% by mass or more of the nonionic surfactant.

5. The first agent further comprises The oxidation hair dye composition according to claim 1 , which contains a carbonate.

6. The first agent further comprises an anionic surfactant; a nonionic surfactant; The oxidation hair dye composition according to claim 5, further comprising an amphoteric surfactant.

7. The first agent further comprises The oxidation hair dye composition according to claim 6, which contains a polymer compound.

8. The first agent is The higher alcohol is contained in an amount of 9.0 mass% or more, The carbonate is contained in an amount of 10% by mass or more, The anionic surfactant is contained in an amount of 2.0% by mass or more, The nonionic surfactant is contained in an amount of 3.0% by mass or more, The oxidation hair dye composition according to claim 7, wherein the amphoteric surfactant is contained in an amount of 2.0% by mass or more.

9. The oxidation hair dye composition according to any one of claims 5 to 8, which foams when the first agent and the second agent are mixed.

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