Oxidative hair dye composition and method for using same

Abstract

To provide a technique capable of inhibiting color development of an oxidative hair dye composition after mixing.SOLUTION: The oxidative hair dye composition is used by mixing an alkali agent composition containing an oxidative dye and an alkali agent with an oxidizing agent composition containing an oxidizing agent. The mixture of the alkali agent composition and the oxidizing agent composition contains an ascorbic acid derivative. The ascorbic acid derivative has at least one hydroxyl group directly bonded to a five-membered ring forming a lactone structure of ascorbic acid, and a substituent group having four or more carbon atoms. The pH of the mixture immediately after mixing the specific composition, the alkali agent composition, and the oxidizing agent composition is 8.5 or more and 10.5 or less, and the pH drop of the mixture per 10 minutes after mixing is 1.5 or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present specification relates to an oxidation hair dye composition that uses a mixture of an alkaline agent composition and an oxidizing agent composition, and a method for using the same. [Background technology]

[0002] Oxidative hair dyes containing oxidative dyes have been known as hair dyes for dyeing hair. However, these types of oxidative hair dyes have the problem of easily staining the scalp, skin, and other natural surfaces. Patent Document 1 discloses an oxidative hair dye that contains ascorbic acids to prevent staining of the natural surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-29946 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, oxidation hair dyes are mainly composed of an oxidation dye, an alkali agent, and an oxidizing agent, which are mixed together and applied to the hair immediately before use. The technology of Patent Document 1 suppresses dyeing of the scalp, but has the problem that the oxidation hair dye applied to the hair develops color in a short time, making it difficult to visually confirm the degree of dyeing. This specification provides a technology that can suppress the color development of the oxidation hair dye after mixing. [Means for solving the problem]

[0005] As a result of extensive research, the present inventors have found that the color development of a mixture can be suppressed by adding an ascorbic acid derivative having a specific structure and adjusting the pH of the mixture after mixing. Based on this finding, the present specification provides the following means.

[0006] A first aspect disclosed by this specification is an oxidation hair dye composition comprising a mixture of an alkaline agent composition containing an oxidation dye and an alkaline agent, and an oxidizing agent composition containing an oxidizing agent. The mixture of the alkaline agent composition and the oxidizing agent composition may contain an ascorbic acid derivative. The ascorbic acid derivative may have at least one hydroxy group directly bonded to the five-membered ring that forms the lactone structure of ascorbic acid and a substituent having four or more carbon atoms. The pH of the mixture immediately after mixing of the alkaline agent composition and the oxidizing agent composition may be 8.5 to 10.5, and the decrease in pH of the mixture every 10 minutes after mixing may be 1.5 or less.

[0007] In a second aspect disclosed by the present specification, in the first aspect described above, the decrease in the viscosity from immediately after mixing to 10 minutes after mixing may be 0.3 or more and 1.5 or less, the decrease in the viscosity from 10 minutes after mixing to 20 minutes after mixing may be 0.3 or more and 1.0 or less, and the decrease in the viscosity from 20 minutes after mixing to 30 minutes after mixing may be 0.1 or more and 0.8 or less.

[0008] In a third aspect disclosed by the present specification, in the first or second aspect, the content of the ascorbic acid derivative relative to the total amount of the mixture may be 0.5% by mass or more in terms of ascorbic acid.

[0009] In a fourth aspect disclosed by the present specification, in any one of the first to third aspects, the ascorbic acid derivative may include at least one of ascorbyl palmitate, ascorbyl stearate, and ascorbyl dipalmitate.

[0010] In a fifth aspect disclosed by the present specification, in any one of the first to fourth aspects, the ascorbic acid derivative may be blended in to suppress color development of the oxidative hair dye composition.

[0011] A sixth aspect disclosed by the present specification is a method for using an oxidative hair dye composition. The method may include a step of mixing an alkaline agent composition containing an oxidative dye and an alkaline agent with an oxidizing agent composition containing an oxidizing agent to prepare a mixture, the mixture containing an ascorbic acid derivative. The ascorbic acid derivative may have at least one hydroxy group directly bonded to the five-membered ring that forms the lactone structure of ascorbic acid and a substituent having four or more carbon atoms. In the method, the pH of the mixture immediately after mixing may be 8.5 to 10.5, and the pH of the mixture may decrease by 1.5 or less every 10 minutes after mixing.

[0012] In a seventh aspect disclosed by the present specification, in the sixth aspect, the method of use may be a method for suppressing color development of the oxidative hair dye composition. [Brief explanation of the drawings]

[0013] [Figure 1] 1 shows a graph of the change in pH over time for mixtures of examples and comparative examples. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, one embodiment of the oxidative hair dye composition disclosed in this specification will be described. The oxidative hair dye composition is used as an oxidative hair dye by mixing an alkaline agent composition (so-called first agent) containing an oxidative dye and an alkaline agent with an oxidizing agent composition (so-called second agent) containing an oxidizing agent. The mixture of the oxidative hair dye composition contains an ascorbic acid derivative. The ascorbic acid derivative can be blended to suppress color development of the oxidative hair dye. The ascorbic acid derivative may be contained in the mixture of the alkaline agent composition and the oxidizing agent composition. For example, it may be contained in the first agent containing the oxidative dye and the alkaline agent, or it may be contained in a separate agent (i.e., third agent) from the first and second agents. Hereinafter, an embodiment in which the ascorbic acid derivative is contained in the first agent of a two-agent oxidative hair dye will be described.

[0015] [First agent] The first agent contains an oxidation dye, an alkaline agent, and an ascorbic acid derivative.

[0016] [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.

[0017] 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, phloroglucinol, 2,4-diaminophenoxyethanol, 2,4-diaminophenoxyethanol hydrochloride, 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.

[0018] The oxidation dye may contain only one of these or a combination of two or more of them depending on the desired color tone. Among these, the main intermediate is preferably used from the viewpoint of obtaining high hair dyeing power.

[0019] The content of the oxidative dye in the first agent is not particularly limited and may be appropriately determined depending on the tone and shade of the desired hair color. The lower limit of the content is, for example, 0.01% by mass or more, for example, 0.1% by mass or more, for example, 0.5% by mass or more, or for example, 1% by mass or more. The upper limit of the content is, for example, 15% by mass or less, for example, 13% by mass or less, for example, 10% by mass or less, or for example, 8% by mass or less. The range of the content can be set by appropriately combining the above upper and lower limits, for example, 0.01% by mass or more and 15% by mass or less, for example, 0.1% by mass or more and 13% by mass or less, for example, 0.5% by mass or more and 10% by mass or less, or for example, 1% by mass or more and 8% 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.

[0020] [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.

[0021] 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.

[0022] The content of the alkaline agent in the first agent is not particularly limited. The lower limit of the content is, for example, 0.1% by mass or more, for example, 0.2% by mass or more, for example, 0.5% by mass or more, or for example, 0.7% by mass or more. The upper limit of the content is, for example, 10% by mass or less, for example, 9.6% by mass or less, for example, 9% by mass or less, or for example, 8% by mass or less. The range of the content can be set by appropriately combining the above upper and lower limits, for example, 0.1% by mass or more and 10% by mass or less, for example, 0.2% by mass or more and 9.6% by mass or less, for example, 0.5% by mass or more and 9% by mass or less, or for example, 0.7% by mass or more and 8% 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.

[0023] [Ascorbic acid derivatives] The ascorbic acid derivative is added to lower the pH of the mixture over time. When an alkaline agent composition (i.e., the first agent) containing the ascorbic acid derivative is mixed with an oxidizing agent composition (i.e., the second agent), the pH of the mixture gradually decreases over the course of the hair dyeing treatment due to the action of the ascorbic acid derivative. This allows the mixture to have a sustained color development inhibition effect.

[0024] The ascorbic acid derivative has at least one hydroxy group directly bonded to the five-membered ring forming the lactone structure of ascorbic acid. In other words, the ascorbic acid derivative has a hydroxy group bonded to at least one of the carbon atoms at the second or third position of ascorbic acid. The hydroxy group contributes to the reducing power of the ascorbic acid derivative. Because the ascorbic acid derivative has 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. Note that the pH of the mixture after the completion of the hair dyeing treatment time is preferably shifted to the neutral or acidic side, more preferably to a weak acidic side, since this can prevent the alkaline agent from remaining on the hair and improve the feel of the hair. Specifically, the upper limit of the pH of the mixture after the end of the hair dyeing treatment time may be, for example, 8 or less, or, for example, 7.5 or less, or, for example, 7.3 or less, or, for example, 7 or less, and the lower limit of the pH may be, for example, 3 or more, or, for example, 4 or more, or, for example, 5 or more.

[0025] The ascorbic acid derivative also has a substituent with four or more carbon atoms. In the present oxidation hair dye composition, the following mechanism is assumed to be the effect of the ascorbic acid derivative having this substituent: The substituent confers oil-solubility to the ascorbic acid derivative. Because the first agent is primarily water-soluble, the ascorbic acid derivative is thought to be emulsified in the first agent by the action of the substituent, forming stable micelles. When the first agent is mixed with the second agent, the structure of the micelles changes, and the ascorbic acid derivative is gradually released into the mixture. As described above, the ascorbic acid derivative lowers the pH of the mixture by its action. The ascorbic acid derivative gradually acts in the mixture due to the influence of the reaction between the alkaline agent and the oxidizing agent, etc., and can slow the rate at which the pH of the mixture decreases. Based on the above mechanism, slowing the rate at which the pH of the mixture decreases is thought to make it possible to impart a suitable brightness to hair while maintaining the color development-inhibiting effect of the mixture for a long period of time.

[0026] The above-mentioned substituents substitute for hydrogen atoms of the hydroxy groups of ascorbic acid. For example, the substituents may substitute for hydrogen atoms of the hydroxy groups bonded to the 2nd or 3rd carbon atoms of ascorbic acid, or may substitute for hydrogen atoms of the hydroxy groups bonded to the 5th or 6th carbon atoms of ascorbic acid. As described above, as long as an ascorbic acid derivative has a hydroxy group bonded to at least one of the 2nd or 3rd carbon atoms of ascorbic acid, it may have two or more substituents. From the viewpoint of ensuring the reducing power of the ascorbic acid derivative, it is preferable that the hydrogen atoms of the hydroxy groups bonded to the 2nd or 3rd carbon atoms of ascorbic acid are not substituted with the substituents. When an ascorbic acid derivative has two or more substituents, the structures of the respective substituents may or may not be identical. The lower limit of the number of carbon atoms of each of the substituents is, for example, 4 or more, preferably 8 or more, particularly preferably 12 or more, and even more preferably 14 or more. The upper limit of the number of carbon atoms of each of the substituents is, for example, 22 or less, preferably 20 or less, and particularly preferably 18 or less. Furthermore, each of the substituents may be linear, branched, or cyclic, but is preferably linear from the viewpoint of the stability of the micelles formed during preparation of the first agent.

[0027] Examples of ascorbic acid derivatives include ascorbyl palmitate, ascorbyl stearate, ascorbyl dipalmitate, ascorbyl myristate, ascorbyl laurate, ascorbyl tartrate, ascorbyl citrate, ascorbyl succinate, ascorbic acid 2-glucoside, and ascorbic acid 6-glucoside. The ascorbic acid derivative may contain only one of these or a combination of two or more. From the viewpoint of the above-mentioned effects and the stability of the mixture, the ascorbic acid derivative is preferably oil-soluble and is preferably a compound represented by the following formula (1) or (2).

[0028] [ka] [ka] {In formula (1) and formula (2), R1, R2, and R3 each independently represent an optionally substituted linear, branched, or cyclic alkyl group having 4 to 22 carbon atoms.}

[0029] Among the compounds represented by formula (1) and formula (2), the ascorbic acid derivative is preferably ascorbyl palmitate (L-ascorbyl-6-palmitate), ascorbyl stearate (L-ascorbyl-6-stearate), or ascorbyl dipalmitate (L-ascorbyl-2,6-dipalmitate).

[0030] The lower limit of the content of the ascorbic acid derivative in the first agent is, for example, 1% by mass or more, preferably 1.5% by mass or more, particularly preferably 2% by mass or more, and even more preferably 3% by mass or more, calculated as ascorbic acid. The upper limit of the content is, for example, 20% by mass or less, preferably 16% by mass or less, particularly preferably 12% by mass or less, and even more preferably 8% 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% by mass or more and 20% by mass or less, preferably 1.5% by mass or more and 16% by mass or less, particularly preferably 2% by mass or more and 12% by mass or less, and even more preferably 3% by mass or more and 8% by mass or less.

[0031] [Second agent] The second agent contains an oxidizing agent.

[0032] [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.

[0033] 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.

[0034] The content of the oxidizing agent in the second agent is not particularly limited, but is, for example, 0.1% by mass to 20% by mass, for example, 0.3% by mass to 10% by mass, or for example, 0.5% by mass to 8% by mass. If the content is 0.1% by mass or more, the oxidative dye can be easily oxidatively polymerized sufficiently. On the other hand, if the content is 20% by mass or less, the feel of the hair is likely to be good.

[0035] [Other ingredients] The first and / or second agents may contain other ingredients such as water, pH adjusters (excluding ascorbic acid derivatives), surfactants, oily ingredients, and chelating agents, which may be appropriately selected.

[0036] [pH adjuster] A pH adjuster may be contained to adjust the pH of the agent, and examples of the pH adjuster include phosphoric acid, acetic acid, hydrochloric acid, sulfuric acid, nitric acid, succinic acid, levulinic acid, and salts thereof.

[0037] [Surfactants] Surfactants include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants.

[0038] Examples of nonionic surfactants include polyoxyethylene (hereinafter referred to as POE) alkyl ethers, POE alkylphenyl ethers, POE-polyoxypropylene alkyl ethers, POE sorbitan fatty acid esters, POE propylene glycol fatty acid esters, etc. Examples of POE alkyl ethers include POE lauryl ether, POE cetyl ether, POE stearyl ether, POE behenyl ether, etc.

[0039] 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.

[0040] Examples of anionic surfactants include alkyl sulfates such as sodium laurate, POE alkyl sulfates such as sodium POE lauryl ether sulfate, alkyl sulfates such as triethanolamine lauryl sulfate, sodium stearoylmethyl taurate, triethanolamine dodecylbenzenesulfonate, sodium tetradecenesulfonate, POE lauryl ether phosphate and salts thereof, and the like.

[0041] Examples of 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, triethanolamine laurylaminopropionate, coconut oil alkyl betaine, lauryl dimethylaminoacetic acid betaine, myristyl dimethylaminoacetic acid betaine, stearyl dimethylaminoacetic acid betaine, sodium stearyl dimethyl betaine, coconut oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, and lauryl hydroxysulfobetaine.

[0042] The content of the surfactant is not particularly limited, but may be in the range of 0.01% by mass to 20% by mass for each of the first and second agents.

[0043] [Oily ingredients] Examples of oily components include higher alcohols, fats and oils, waxes, hydrocarbons, higher fatty acids, alkyl glyceryl ethers, esters, silicones, and polyhydric alcohols. For example, when the formulation is to be a well-emulsified liquid, it is particularly preferable to include higher alcohols.

[0044] 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.

[0045] When a higher alcohol is contained in the first and second agents, its content is not particularly limited, but the lower limit of the content is, for example, 1% by mass or more, for example, 2% by mass or more, or for example, 3% by mass or more. The upper limit of the content is, for example, 20% by mass or less, for example, 15% by mass or less, or for example, 10% by mass or less. The range of the content can be set by appropriately combining the above-mentioned upper and lower limits, but is, for example, 1% by mass or more and 20% by mass or less, for example, 2% by mass or more and 15% by mass or less, or for example, 3% by mass or more and 10% by mass or less.

[0046] Examples of oils and fats 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.

[0047] Waxes include, for example, beeswax, candelilla wax, carnauba wax, jojoba oil, and lanolin.

[0048] Examples of hydrocarbons include paraffin, olefin oligomer, polyisobutene, hydrogenated polyisobutene, mineral oil, squalane, polybutene, polyethylene, microcrystalline wax, and petrolatum.

[0049] 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.

[0050] Alkyl glyceryl ethers include, for example, batyl alcohol, chimyl alcohol, selachyl alcohol, and isostearyl glyceryl ether.

[0051] 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.

[0052] Examples of silicones include dimethylpolysiloxane (dimethicone), 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.

[0053] Examples of polyhydric alcohols include glycols and glycerin. Examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, and 1,3-butylene glycol. Examples of glycerin include glycerin, diglycerin, and polyglycerin.

[0054] The oily component is blended to make the hair supple. It is also blended to make the first and second agents into the desired formulation. For example, when a cream formulation is used, the lower limit of the content of the oily component contained in the first and second agents is, for example, 1% by mass or more, for example, 3% by mass or more, or for example, 5% by mass or more. The upper limit of the content is, for example, 40% by mass or less, for example, 30% by mass or less, or for example, 20% 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, 1% by mass or more and 40% by mass or less, for example, 2% by mass or more and 30% by mass or less, or for example, 3% by mass or more and 20% by mass or less.

[0055] [Chelating agent] Examples of chelating agents include ethylenediaminetetraacetic acid (EDTA, edetic acid), hydroxyethylethylenediaminetriacetic acid (HEDTA) and its salts, diethylenetriaminepentaacetic acid and its salts, and hydroxyethanediphosphonic acid (HEDP, etidronic acid) and its salts.

[0056] 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; sugars such as sorbitol and maltose; water-soluble polymers such as nonionic polymers, anionic polymers, cationic polymers, and amphoteric polymers; 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; and at least one selected from those listed in the "Standards for Quasi-drug Raw Materials" (published June 2006, Yakuji Nipposha).

[0057] [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.

[0058] [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.

[0059] The lower limit of the content of the ascorbic acid derivative relative to the total amount of the mixture, calculated as ascorbic acid, is, for example, 0.5% by mass or more, for example, 0.8% by mass or more, for example, 1% by mass or more, or for example, 1.5% by mass or more. The upper limit of the content is, for example, 10% by mass or less, for example, 8% by mass or less, for example, 6% by mass or less, or for example, 4% by mass or less. The range of the content can be set by appropriately combining the above upper and lower limits, for example, 0.5% by mass or more to 10% by mass or less, for example, 0.8% by mass or more to 8% by mass or less, for example, 1% by mass or more to 6% by mass or less, or for example, 1.5% by mass or more to 4% by mass or less. A content of 0.5% by mass or more easily achieves a sufficient color development inhibition effect of the mixture and also easily promotes the oxidative polymerization reaction of the oxidative dye by the oxidizing agent. Furthermore, a content of 10% by mass or less can inhibit color development of the mixture while providing sufficient hair dyeing power.

[0060] In the mixture, the lower limit of the mass ratio of the ascorbic acid derivative to the alkaline agent is not particularly limited, but is, in ascorbic acid terms, for example, 0.1 or more, for example, 0.2 or more, for example, 0.3 or more, or for example, 0.5 or more. The upper limit of this mass ratio is not particularly limited, but is, for example, 10 or less, for example, 5 or less, for example, 3 or less, or for example, 1 or less. The range of this mass ratio can be set by appropriately combining the above-mentioned upper and lower limits, but is, for example, 0.1 to 10 or less, for example, 0.2 to 5 or less, for example, 0.3 to 3 or less, or for example, 0.5 to 1 or less. If the mass ratio is 0.1 or more, the pH control effect of the mixture is easily obtained, and if the mass ratio is 10 or less, the pH control effect of the mixture is easily and efficiently obtained.

[0061] [pH of the mixture] The lower limit of the pH of the mixture immediately after mixing the first and second agents is, for example, 8.5 or higher, for example, 8.7 or higher, for example, 8.9 or higher, or for example, 9.0 or higher. The upper limit of the pH of the mixture immediately after mixing the first and second agents is, for example, 10.5 or lower, for example, 10.0 or lower, for example, 9.7 or lower, or for example, 9.5 or lower. The pH range can be set by appropriately combining the above upper and lower limits, for example, 8.5 to 10.5 or lower, for example, 8.7 to 10.0 or lower, for example, 8.9 to 9.7 or lower, or for example, 9.0 to 9.5 or lower. If the pH is 8.5 or higher, the action of the oxidizing agent is easily promoted, and if the pH is 10.5 or lower, the ascorbic acid derivative reacts appropriately, allowing the effect of the ascorbic acid derivative to be obtained over a long period of time. In other words, if the pH is 8.5 to 10.5, color development of the mixture can be suitably suppressed. The pH of the mixture immediately after mixing can be adjusted by the amount of acid and alkali agent added. For example, increasing the amount of a pH adjuster such as an ascorbic acid derivative or other acid decreases the pH of the mixture immediately after mixing, while increasing the amount of an alkali agent increases the pH of the mixture immediately after mixing.

[0062] As described above, the pH of the mixture gradually decreases due to the action of the ascorbic acid derivative. That is, when the mixture (oxidative hair dye) is applied to hair, the pH of the mixture applied to the hair decreases over time. The upper limit of the decrease in pH of the mixture after mixing per 10 minutes is, for example, 1.5 or less, for example, 1.4 or less, for example, 1.3 or less, for example, 1.2 or less, for example, 1.1 or less, or for example, 1.0 or less. The lower limit of the decrease in pH of the mixture after mixing per 10 minutes is, for example, 0.1 or more, for example, 0.2 or more, for example, 0.3 or more, or for example, 0.4 or more. If the decrease in pH per 10 minutes is 1.5 or less, the color development of the mixture can be suitably suppressed for a long period of time, while imparting a suitable brightness to the hair.

[0063] Furthermore, it is preferable that the decrease in pH gradually decreases over time. Specifically, the decrease in pH from immediately after mixing to 10 minutes after mixing is, for example, 0.3 to 1.5, for example, 0.5 to 1.3, for example, 0.6 to 1.1, or for example, 0.7 to 1.0. The decrease in pH from 10 minutes after mixing to 20 minutes after mixing is, for example, 0.3 to 1.0, for example, 0.4 to 0.9, or for example, 0.5 to 0.8. The decrease in pH from 20 minutes after mixing to 30 minutes after mixing is, for example, 0.1 to 0.8, for example, 0.2 to 0.7, or for example, 0.3 to 0.6, or for example, 0.4 to 0.5. If the decrease in pH of the mixture at each elapsed time is within the above range, color development of the mixture can be more suitably suppressed. The decrease in pH of the mixture can be adjusted by appropriately selecting the type of ascorbic acid derivative to be added.

[0064] [Method of using the oxidation hair dye composition] As described above, in this embodiment, the ascorbic acid derivative is contained in the first agent. Therefore, similar to conventional oxidation hair dyes, the oxidation hair dye composition is used by mixing a first agent containing an oxidation dye, an alkaline agent, and an ascorbic acid derivative with a second agent containing an oxidizing agent to prepare a mixture (oxidative hair dye), and applying the mixture to hair. The method of using the oxidation hair dye composition may be used to suppress the color development of such oxidation hair dyes. Note that when the ascorbic acid derivative is not contained in the first agent (i.e., when the ascorbic acid derivative is contained in an agent different from the first and second agents), the mixture can be prepared by mixing the different agent with the first and second agents.

[0065] 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]

[0066] 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.

[0067] (Examples 1 to 5, Comparative Examples 1 to 5) In each example, a first agent and a second agent were prepared by mixing the components shown in Table 1. The numerical value in the column showing each component in Table 1 indicates the content of that component in the agent, expressed in mass %. Next, the first agent and the second agent were mixed in a 1:1 ratio to prepare a creamy mixture (oxidative hair dye). For each example, the pH of the mixture was measured up to 30 minutes after mixing, and the color development inhibition of the mixture 30 minutes after mixing was evaluated according to the method described below.

[0068] [Table 1]

[0069] The structural formulas of the (A) component and the (a) component in Table 1 are shown below. Formula (3) is ascorbyl palmitate, formula (4) is ascorbyl stearate, formula (5) is ascorbyl dipalmitate, formula (6) is glyceryl ascorbate, formula (7) is 3-O-ethyl ascorbic acid, formula (8) is ascorbyl tetrahexyldecanoate, and formula (9) is ascorbic acid. In formula (8), R 4 is a hexyl group, and R 5 is an octyl group.

[0070] [ka] [ka] [ka] [ka] [ka] [ka] [ka]

[0071] <Evaluation method for color development inhibition> The mixtures prepared in each example were left to stand for 30 minutes, after which 10 expert panelists visually inspected the mixtures and evaluated the degree of color suppression according to the following criteria. The color of the mixtures of Comparative Example 5, containing 3% by mass of ascorbic acid, was compared to the control, and the color of the mixtures of Comparative Example 5 was scored on a four-point scale: significantly suppressed (4 points), suppressed (3 points), equivalent (2 points), and not suppressed (1 point). The panelists' scores were averaged, and the evaluation results were given as follows: an average of 3.5 points or more was designated "◎", an average of 2.5 points to less than 3.5 points was designated "○", an average of 1.5 points to less than 2.5 points was designated "△", and an average of less than 1.5 points was designated "×". The results are also shown in Table 1.

[0072] <Method for measuring pH of a mixture> Because the pH of the mixture changes over time immediately after mixing, a pH meter capable of real-time measurement with the detector immersed in the sample was used. In this example, pH was measured using a glass electrode hydrogen ion concentration indicator (type: SS056, model: F-52) manufactured by HORIBA STEC Co., Ltd. Note that "pH immediately after mixing" in this specification refers to the pH 2 minutes after the first and second components were mixed. Specifically, the first and second components were quickly mixed, the mixture was transferred to a measuring vessel, and the detector was immersed to measure the pH 2 minutes after the start of mixing. For each example, the pH was measured immediately after mixing, 10 minutes after mixing, 20 minutes after mixing, and 30 minutes after mixing. The results are shown in Table 1.

[0073] As shown in Table 1, Examples 1 to 5, which contain an ascorbic acid derivative (component (A)) having at least one hydroxy group directly bonded to the five-membered ring that forms the lactone structure of ascorbic acid and a substituent having 4 or more carbon atoms, were confirmed to be able to effectively suppress color development in the mixture even 30 minutes after mixing. This is because, as shown in Figure 1, the substituent imparts oil-solubility to the ascorbic acid derivative, causing the pH of the mixture to gradually decrease.

[0074] On the other hand, in Comparative Example 5, which contained ascorbic acid as component (a), the pH of the mixture decreased, but the degree of color development inhibition of the mixture was lower than in the Examples. This is thought to be because ascorbic acid is water-soluble, it was consumed quickly after mixing the first and second agents. As shown in Figure 1, the pH of the mixture decreased significantly in a short period of time, and the color development inhibition effect of the mixture did not last. Furthermore, Comparative Example 4, which did not contain ascorbic acids, had low reducing power, and as shown in Figure 1, the pH hardly decreased and the color development of the mixture was not inhibited. Similarly, in Comparative Example 3, which contained ascorbyl tetrahexyldecanoate as component (a) in which all hydroxy groups bonded to the 2nd or 3rd carbon atom of ascorbic acid are substituted, the pH hardly decreased and the mixture developed color due to the low reducing power of component (a). The evaluation results of Comparative Examples 3 to 5 show that the addition of an ascorbic acid derivative having a specific structure can be effective in inhibiting the color development of a mixture.

[0075] Furthermore, in Comparative Examples 1 and 2, which contained glyceryl ascorbate and 3-O-ethyl ascorbic acid, respectively, as component (a), which did not have a substituent with 4 or more carbon atoms (having a substituent with 3 or less carbon atoms), color development of the mixture could not be suppressed. In Comparative Examples 1 and 2, since one of the hydroxy groups bonded to the 2nd or 3rd carbon atom of ascorbic acid was substituted, the reducing power of component (a) was relatively low, and the pH of the mixture was hardly reduced. For these reasons, it is believed that color development of the mixture was not suppressed in Comparative Examples 1 and 2. The evaluation results of Comparative Examples 1 and 2 show that the effect of suppressing color development is also exerted by a substituent with 4 or more carbon atoms.

[0076] As explained above, it was found that in order to obtain the effect of suppressing color development of the mixture, it is necessary for the pH to decrease within a predetermined range over time after preparation of the mixture.

[0077] 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 mixture of an alkali agent composition containing an oxidation dye and an alkali agent, and an oxidizing agent composition containing an oxidizing agent, the mixture of the alkaline agent composition and the oxidizing agent composition contains an ascorbic acid derivative, The ascorbic acid derivative is At least one hydroxy group directly bonded to the five-membered ring that forms the lactone structure of ascorbic acid; a substituent having 4 or more carbon atoms; the pH of the mixture immediately after mixing the alkaline agent composition and the oxidizing agent composition is 8.5 or more and 10.5 or less; After mixing, the pH of the mixture decreases by 1.5 or less every 10 minutes. Oxidative hair dye composition.

2. the decrease in the value from immediately after mixing to 10 minutes after mixing is 0.3 or more and 1.5 or less, the decrease in the value from 10 minutes after mixing to 20 minutes after mixing is 0.3 or more and 1.0 or less, The decrease in the value from 20 minutes after mixing to 30 minutes after mixing is 0.1 or more and 0.8 or less. The oxidation hair dye composition according to claim 1.

3. 2. The oxidation hair dye composition according to claim 1, wherein the content of the ascorbic acid derivative relative to the total amount of the mixture is 0.5% by mass or more in terms of ascorbic acid.

4. 2. The oxidative hair dye composition according to claim 1, wherein the ascorbic acid derivative comprises at least one of ascorbyl palmitate, ascorbyl stearate, and ascorbyl dipalmitate.

5. The oxidative hair dye composition according to any one of claims 1 to 4, wherein the ascorbic acid derivative is blended to suppress color development of the oxidative hair dye composition.

6. A method of using an oxidation hair dye composition, comprising: a step of mixing an alkaline agent composition containing an oxidation dye and an alkaline agent with an oxidizing agent composition containing an oxidizing agent to prepare a mixture, the mixture containing an ascorbic acid derivative; The ascorbic acid derivative is At least one hydroxy group directly bonded to the five-membered ring that forms the lactone structure of ascorbic acid; a substituent having 4 or more carbon atoms; The pH of the mixture immediately after mixing is 8.5 or more and 10.5 or less, After mixing, the pH of the mixture decreases by 1.5 or less every 10 minutes. How to use.

7. The method of use according to claim 6, which is a method for inhibiting color development of the oxidative hair dye composition.

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