Hair bleaching / decoloring agent or hair dye composition

Abstract

To provide a hair bleaching / decolorizing agent or a hair dye composition that allows reduced damage to cuticles.SOLUTION: The present invention provides a hair bleaching / decolorizing agent or a hair dye composition containing (A) acid and (B) at least one selected from carbonate and hydrogencarbonate.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to a hair bleaching / decoloring agent or hair dye composition. [Background technology]

[0002] Carbonates, hydrogen carbonates, etc. may be used as alkaline agents in hair bleaching / decoloring agents or hair dyes. For example, Patent Document 1 describes a hair bleaching agent containing ammonium hydrogen carbonate as an alkaline agent. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-106951 Summary of the Invention [Problem to be solved by the invention]

[0004] As a result of detailed studies by the present inventors, it was found that hair bleaching / decoloring agents or hair dye compositions that use carbonates can cause significant damage to the cuticle. One aspect of the present disclosure provides a hair bleach / decolorizing or hair dye composition that causes reduced damage to the cuticle. [Means for solving the problem]

[0005] One aspect of the present disclosure is a hair bleach / decolorizing or hair dye composition, which contains (A) an acid and (B) at least one selected from carbonates and bicarbonates. In one embodiment of the present disclosure, the component (A) may contain at least one selected from ε-aminocaproic acid, acetic acid, nicotinic acid, folic acid, glutamic acid, and aspartic acid.

[0006] In one embodiment of the present disclosure, the content of component (A) in the hair bleaching / dyeing agent or hair dye composition may be 0.001% by mass or more and less than 2.0% by mass.

[0007] In one embodiment of the present disclosure, the content of component (B) in the hair bleaching / dyeing agent or hair dye composition may be 0.01% by mass or more and less than 3.5% by mass. In one embodiment of the present disclosure, the hair bleaching / dyeing agent or hair dye composition may further contain an oxidizing agent (C), and the mass ratio of the content of component (B) in the hair bleaching / dyeing agent or hair dye composition to the content of component (C) in the hair bleaching / dyeing agent or hair dye composition may be 0.001 or more and less than 2. [Effects of the Invention]

[0008] According to one aspect of the present disclosure, there is provided a hair bleaching / decoloring agent or hair dye composition that causes reduced damage to the cuticle. DETAILED DESCRIPTION OF THE INVENTION

[0009] A hair bleach / decolorizing or hair dye composition according to one embodiment of the present disclosure contains (A) an acid and (B) at least one selected from carbonates and bicarbonates. The alkaline agent contained in the hair bleach / decolorizing agent or hair dye composition swells the hair and lifts the cuticle, thereby facilitating the penetration of various ingredients such as oxidizing agents and dyes into the cortex layer inside the hair. Ammonia is a typical alkaline agent. However, since ammonia has a distinctive, strong odor, methods for suppressing this odor have been investigated, such as using carbonates or bicarbonates instead of ammonia, or using ammonia in combination with carbonates or bicarbonates.

[0010] Generally, bleaching, dyeing, or dyeing hair can damage the hair due to oxidation reactions that accompany these treatments. If excessive damage occurs to the hair, the tensile strength of the hair may decrease, which may eventually lead to hair breakage. The amount of cysteic acid in hair is one indicator of the degree of hair damage. Cysteic acid is irreversibly produced from cystine and cysteine ​​through excessive oxidation. Therefore, the higher the amount of cysteic acid, the greater the hair damage.

[0011] As a result of the inventors' investigations, it was found that the state of hair damage differs between when a carbonate or bicarbonate is added as an alkaline agent and when only ammonia is used. Specifically, it was found that the amount of cysteic acid in the cuticle layer, which is the surface layer of the hair, is greater when a carbonate or bicarbonate is added than when only ammonia is used.

[0012] The inventors speculate that this difference is due to the difference in the penetration ability of ammonia and carbonate or bicarbonate into hair. Specifically, ammonia penetrates deep into the cortex layer, the inner layer of hair, and is distributed relatively uniformly throughout the hair, whereas carbonate or bicarbonate does not penetrate the cortex layer easily and tends to remain within the cuticle layer. Therefore, carbonate or bicarbonate is locally present in the endocuticle, which is located near the boundary between the cuticle and the cortex layer, and excessive oxidation reactions are thought to occur in the endocuticle. Furthermore, a relatively large number of metal ions are present in the endocuticle, particularly around melanin. These metal ions catalyze the oxidation reactions caused by carbonate or bicarbonate, and are therefore more likely to cause excessive oxidation reactions. Such excessive oxidation reactions in the endocuticle may lead to peeling of the cuticle from the cortex layer.

[0013] The present inventors have investigated various methods for reducing cuticle damage in hair bleaching / decoloring or hair dyeing compositions containing carbonates or bicarbonates. As a result, they have found that adding an acid reduces cuticle damage. Although the mechanism is unclear, the present inventors believe that excessive oxidation reactions are suppressed by the acid lowering the pH at the end of the cuticle. Furthermore, according to the inventors' investigations, acids with a relatively large molecular weight, for example, acids with a molecular weight of 100 or more, particularly 130 or more, tend to be more effective in reducing cuticle damage. The inventors believe that this is because acids with a relatively large molecular weight pass through multiple layers within the cuticle and ultimately remain at the endocuticle, thereby locally lowering the pH and suppressing the excessive oxidation reaction at the endocuticle as described above.

[0014] Furthermore, according to the studies of the present inventors, acids having at least one of a hydroxyl group and an amino group (e.g., an NH2 group or an NRR' group) in the molecule tend to be more effective in reducing cuticle damage. The present inventors believe that this is because such acids capture metal ions present around melanin, making it less likely for oxidation reactions to occur.

[0015] In order to reduce cuticle damage, it is conceivable to lower the pH of the hair bleach / decoloring agent or hair dye composition itself by adjusting the content of the alkaline agent. However, doing so would result in a decrease in hair dyeing power and bleaching / decoloring ability. On the other hand, by adding an acid without changing the content of the alkaline agent, the above-mentioned effect of reducing cuticle damage can be achieved without significantly lowering the pH of the hair bleach / decoloring agent or hair dye composition itself. Hereinafter, a hair bleaching / dyeing agent or hair dye composition according to one embodiment of the present disclosure will be described in detail.

[0016] [Hair bleaching / dyeing agent or hair dye composition] Examples of hair bleach / decolorizing or hair dye compositions include multi-component compositions containing a first component containing an alkaline agent and a second component containing an oxidizing agent. The first and second components are mixed and applied to the hair at the time of use. The mixing operation may be performed before or after application to the hair. For example, they may be mixed just before application to the hair, or the first and second components may be taken up with a comb or the like and mixed on the hair using a comb or the like. A multi-component composition may consist of only two components, the first and second components, or may consist of three or more components including other components. Furthermore, a hair bleach / decolorizing or hair dye composition may consist of only one component. The following description will mainly use a two-component composition as an example.

[0017] Hair bleaching agents bleach hair by oxidatively decomposing melanin, the pigment in hair. Hair bleaching agents bleach hair that has been dyed with a dye, and oxidatively decompose the dye and melanin.

[0018] Examples of hair dyes include oxidation hair dyes containing oxidation dyes. Oxidation hair dyes dye hair by oxidatively polymerizing the oxidation dye to develop color. The oxidation dye is contained in, for example, a first agent containing an alkaline agent.

[0019] The form of each component constituting the hair bleach / decoloring or hair dye composition and the form in which the components are mixed together at the time of use are not particularly limited. Examples of the form include liquid, emulsion (water-in-oil emulsion, oil-in-water emulsion, multiple emulsion), powder, tablet, gel, and foam. When foaming at the time of use, it can be made into foam using a known foaming tool. Examples of known foaming tools include non-aerosol foamers, aerosol foamers, and shakers. In the case of aerosol foamers, known propellants and foaming agents can be used.

[0020] [Component (A)] As described above, component (A) reduces cuticle damage. Component (A) may be contained in the first agent containing an alkaline agent, the second agent containing an oxidizing agent, or both the first and second agents. In the case of a three- or more-component formula, component (A) may be contained in any of the agents, and may be contained in one or more agents.

[0021] Any acid, such as an organic acid or an inorganic acid, can be used as component (A). Examples of organic acids include ε-aminocaproic acid, acetic acid, lactic acid, nicotinic acid, folic acid, glutamic acid, tartaric acid, citric acid, aspartic acid, succinic acid, and ethylenediaminetetraacetic acid. Examples of inorganic acids include phosphoric acid. One of these acids may be contained alone, or two or more may be contained.

[0022] As component (A), at least one selected from ε-aminocaproic acid, acetic acid, nicotinic acid, folic acid, glutamic acid, and aspartic acid is preferred, because it has a high effect of reducing damage to the cuticle, at least one selected from ε-aminocaproic acid, acetic acid, nicotinic acid, and folic acid is more preferred, at least one selected from ε-aminocaproic acid, acetic acid, nicotinic acid, and folic acid is even more preferred, and folic acid is even more preferred.

[0023] The content of component (A) in the hair bleach / decoloring agent or hair dye composition is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, and even more preferably 0.1% by mass or more. When the content of component (A) is 0.001% by mass or more, a greater effect of reducing cuticle damage can be obtained. Furthermore, the content of component (A) is preferably less than 2.0% by mass, more preferably less than 1.5% by mass, and even more preferably less than 1.1% by mass. When the content of component (A) is less than 2.0% by mass, the oxidation reaction is prevented from being reduced by component (A), thereby maintaining high hair dyeing power and bleaching / decoloring power.

[0024] The content of component (A) in the hair bleach / bleaching or hair dye composition refers to the content in the hair bleach / bleaching or hair dye composition at the time of use. For example, in the case of a two-component composition, it refers to the content of component (A) in the mixture obtained by mixing the first and second components. The same applies to the content in the hair bleach / bleaching or hair dye composition described below.

[0025] Furthermore, the content of component (A) in each agent constituting the hair bleach / decolorizing or hair dye composition is preferably less than 4.0% by mass, more preferably less than 3.0% by mass, and even more preferably less than 2.5% by mass. When the content of component (A) in each agent is less than 4.0% by mass, the formulation stability is high. Formulation stability refers to the stability of each agent when stored for a long period of time, and means, for example, that precipitation is unlikely to occur or the emulsion state is unlikely to become unstable.

[0026] [(B) Component] Component (B) functions as an alkaline agent. Component (B) is contained in the first agent. Examples of carbonates of component (B) include sodium carbonate, ammonium carbonate, potassium carbonate, lithium carbonate, calcium carbonate, magnesium carbonate, barium carbonate, guanidine carbonate, etc. Examples of bicarbonates include sodium bicarbonate, ammonium bicarbonate, potassium bicarbonate, guanidine bicarbonate, etc. Of these, one type may be contained alone, or two or more types may be contained.

[0027] As component (B), at least one selected from ammonium bicarbonate, sodium bicarbonate, ammonium carbonate, potassium carbonate and sodium carbonate is preferred because of its high hair dyeing power and bleaching / decoloring power, and ammonium bicarbonate is more preferred.

[0028] The content of component (B) in the hair bleaching / dyeing agent or hair dye composition is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.6% by mass or more. According to the inventors' studies, when the composition does not contain component (A), a content of component (B) of 0.01% by mass or more tends to cause cuticle damage. However, by incorporating component (A), cuticle damage is reduced even at such a content of component (B). Furthermore, a content of component (B) of 0.01% by mass or more provides high hair dyeing and bleaching / decoloring power. Furthermore, the content of component (B) is preferably less than 3.5% by mass, more preferably less than 2.5% by mass, and even more preferably less than 1.5% by mass. A content of component (B) of less than 3.5% by mass further reduces cuticle damage and enhances formulation stability.

[0029] Furthermore, the content of component (B) in each agent constituting the hair bleach / decolorizing or hair dye composition is preferably less than 8.0% by mass, more preferably less than 5.0% by mass, and even more preferably less than 3.0% by mass. When the content of component (B) in each agent is less than 8.0% by mass, the formulation stability is high.

[0030] [Other alkaline agents] The first agent may contain an alkaline agent other than component (B). Examples of alkaline agents other than component (B) include ammonia, alkanolamines, silicates, metasilicates, sulfates, chlorides, phosphates, organic amines, basic amino acids, and hydroxides of alkali metals or alkaline earth metals. Examples of alkanolamines include monoethanolamine and triethanolamine. Examples of silicates include sodium silicate and potassium silicate. Examples of metasilicates include sodium metasilicate and potassium metasilicate. Examples of sulfates include ammonium sulfate. Examples of chlorides include ammonium chloride. Examples of phosphates include ammonium dihydrogen phosphate, diammonium hydrogen phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, and trisodium phosphate. Examples of organic amines include 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, guanidine, and 1-amino-2-propanol. Examples of basic amino acids include arginine and lysine. Examples of hydroxides of alkali metals or alkaline earth metals include sodium hydroxide and potassium hydroxide. Of these alkaline agents, one type may be contained alone, or two or more types may be contained.

[0031] The alkaline agent other than component (B) preferably contains ammonia, as this has excellent hair dyeing and bleaching / decolorizing properties. [(C) component] Component (C) contained in the second agent decomposes melanin through oxidation, and also develops color by oxidatively polymerizing the oxidative dye.

[0032] Examples of component (C) include hydrogen peroxide, urea peroxide, melamine peroxide, sodium percarbonate, potassium percarbonate, sodium perborate, potassium perborate, ammonium persulfate, persulfates such as potassium persulfate and sodium persulfate, sodium peroxide, potassium peroxide, magnesium peroxide, barium peroxide, calcium peroxide, strontium peroxide, hydrogen peroxide adducts of sulfates, hydrogen peroxide adducts of phosphates, hydrogen peroxide adducts of pyrophosphates, peracetic acid and its salts, performic acid and its salts, permanganates, and bromates. One of these oxidizing agents may be used alone, or two or more may be used in combination. Persulfates such as ammonium persulfate, potassium persulfate, and sodium persulfate may also be used as an oxidizing aid.

[0033] The component (C) preferably contains hydrogen peroxide because of its excellent oxidizing effect. The content of component (C) in the hair bleaching / dyeing agent or hair dye composition is preferably 0.6% by mass or more, more preferably 1.2% by mass or more, and even more preferably 2% by mass or more. When the content of component (C) is 0.6% by mass or more, high hair dyeing power and bleaching / dyeing power can be obtained. Furthermore, the content of component (C) is preferably less than 13% by mass, more preferably less than 10% by mass, and even more preferably less than 7% by mass. When the content of component (C) is less than 10% by mass, damage to the cuticle is further reduced.

[0034] The mass ratio (B) / (C) of the content of component (B) in the hair bleaching / dyeing agent or hair dye composition to the content of component (C) in the hair bleaching / dyeing agent or hair dye composition is preferably 0.001 or more, more preferably 0.1 or more, and even more preferably 0.2 or more. In the coexistence of component (B) and component (C), generally, HCO3 - , CO3 - However, if an excessive amount of component (C) is present, the highly oxidizing HCO4 - When the ratio (B) / (C) is 0.001 or more, the amount of component (C) is unlikely to be excessive relative to component (B), and damage to the cuticle is further reduced.

[0035] On the other hand, the mass ratio (B) / (C) is preferably less than 2, more preferably less than 1, and even more preferably less than 0.6. When (B) / (C) is less than 2, the blending balance between the (C) component and the (B) component is good, resulting in high hair dyeing power and bleaching / decoloring power, as well as high formulation stability.

[0036] [Oxidation dyes] The oxidation dye contained in the hair dye composition is composed of, for example, a dye intermediate that develops color by oxidation itself and a coupler that develops color by reacting with the dye intermediate. The oxidation dye is contained in the first agent.

[0037] Examples of dye intermediates include p-phenylenediamine, 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, 1-hydroxyethyl-4,5-diaminopyrazole, and salts thereof. Examples of salts include hydrochlorides and sulfates. One or more of these dye intermediates may be used alone or in combination.

[0038] Examples of couplers include resorcinol, 5-amino-o-cresol, m-aminophenol, α-naphthol, 5-(2-hydroxyethylamino)-2-methylphenol, m-phenylenediamine, 2,4-diaminophenoxyethanol, toluene-3,4-diamine, 2,6-diaminopyridine, diphenylamine, N,N-diethyl-m-aminophenol, phenylmethylpyrazolone, 1,5-dihydroxynaphthalene, 1-hydroxyethyl-4,5-diaminopyrazole, catechol, pyrogallol, phloroglucinol, gallic acid, hydroquinone, tannic acid, and salts thereof. Examples of salts include hydrochlorides and sulfates. These couplers may be used alone or in combination.

[0039] [Other ingredients] The hair bleach / decolorizing agent or hair dye composition may contain other ingredients as needed, such as solvents, oily ingredients, polyhydric alcohols, surfactants, water-soluble polymers, sugars, preservatives, antioxidants, chelating agents, stabilizers, amino acids other than those mentioned above, inorganic salts, direct dyes, pH adjusters, hair growth ingredients, plant extracts, herbal extracts, urea, vitamins, fragrances, and UV absorbers.

[0040] Examples of the solvent include water such as purified water, organic solvents, etc. Examples of the organic solvent include ethanol, n-propanol, isopropanol, methyl cellosolve, ethyl cellosolve, methyl carbitol, ethyl carbitol, benzyl alcohol, benzyloxyethanol, phenethyl alcohol, γ-phenylpropyl alcohol, cinnamic alcohol, anise alcohol, p-methylbenzyl alcohol, α-dimethylphenethyl alcohol, α-phenylethanol, ethylene glycol phenyl ether, phenoxyisopropanol, 2-benzyloxyethanol, N-alkylpyrrolidone, alkylene carbonate, etc. Among these solvents, one type may be contained alone, or two or more types may be contained. It is preferable that the solvent is water.

[0041] Examples of oily components include fats and oils, waxes, hydrocarbons, higher fatty acids, higher alcohols, alkyl glyceryl ethers, esters, and silicones. Examples of fats and oils include argania spinosa kernel oil, 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, evening primrose oil, apricot kernel oil, persic oil, peach kernel oil, palm oil, and egg yolk oil.

[0042] Examples of waxes include beeswax, candelilla wax, carnauba wax, jojoba oil, and lanolin. Examples of hydrocarbons include paraffin, olefin oligomer, polyisobutene, hydrogenated polyisobutene, squalane, polybutene, polyethylene, microcrystalline wax, petrolatum, liquid paraffin, light isoparaffin, light liquid isoparaffin, isoparaffin, α-olefin oligomer, and synthetic squalane.

[0043] 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 acid.

[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] Examples of alkyl glyceryl ethers include batyl alcohol, chimyl alcohol, selachyl alcohol, and isostearyl glyceryl ether. 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 di-2-ethylhexanoate, pentaerythritol fatty acid esters, dipentaerythritol fatty acid esters, cetyl caprate, glyceryl tricaprylate, diisostearyl malate, dioctyl succinate, diethoxyethyl succinate, cetyl 2-ethylhexanoate, and hydrogenated castor oil isostearate.

[0046] Examples of silicones include dimethylpolysiloxane, 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 (for example, (PEG / PPG / butylene / dimethicone) copolymers), betaine-modified silicones, alkyl-modified silicones, alkoxy-modified silicones, mercapto-modified silicones, carboxy-modified silicones, and fluorine-modified silicones. Of these oily components, one type may be contained alone, or two or more types may be contained.

[0047] Examples of polyhydric alcohols include glycol and glycerin. Examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, isoprene glycol, and 1,3-butylene glycol. Examples of glycerin include glycerin, diglycerin, and polyglycerin. Of these polyhydric alcohols, one type may be contained alone, or two or more types may be contained.

[0048] Examples of surfactants include cationic surfactants, anionic surfactants, nonionic surfactants, and amphoteric surfactants. In the following description, POE represents a polyoxyethylene chain, and POP represents a polyoxypropylene chain.

[0049] Examples of cationic surfactants include lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, cetrimonium methosulfate, behentrimonium methosulfate, behenyl PG trimonium chloride, stearoxypropyltrimonium chloride, arachidyltrimethylammonium chloride, alkyltrimethylammonium chloride, distearyldimethylammonium chloride, cetyltrimethylammonium bromide, stearyltrimethylammonium bromide, lanolin fatty acid aminopropylethyldimethylammonium ethyl sulfate, stearyltrimethylammonium saccharin, cetyltrimethylammonium saccharin, methacryloyloxyethyltrimethylammonium chloride, behenyltrimethylammonium methylsulfate, behenyldimethylamine, behenic acid diethylaminoethylamide, behenic acid dimethylaminopropylamide, behenic acid dimethylaminoethylamide, stearyldimethylamine, palmitoxypropyldimethylamine, stearoxypropyldimethylamine, and stearic acid dimethylaminopropylamide.

[0050] Examples of anionic surfactants include alkyl ether sulfates, alkyl sulfates, alkyl ether sulfate ester salts, alkenyl ether sulfates, alkenyl sulfates, olefin sulfonates, alkanesulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylate salts, α-sulfonic acid salts, N-acylamino acid surfactants, phosphate mono- or diester surfactants, sulfosuccinate esters, N-alkyloylmethyl taurine salts, and derivatives thereof. Examples of counter ions of the anionic groups of these surfactants include sodium ions, potassium ions, triethanolamine, and the like. More specifically, examples of alkyl ether sulfate ester salts include sodium POE lauryl ether sulfate. Examples of alkyl sulfate salts include sodium lauryl sulfate and sodium cetyl sulfate. Examples of derivatives of alkyl sulfate salts include sodium POE lauryl sulfate. Examples of sulfosuccinate esters include disodium lauryl sulfosuccinate. Examples of N-alkyloylmethyltaurine salts include sodium N-stearoyl-N-methyltaurine.

[0051] Examples of amphoteric surfactants include cocobetaine, lauramidopropyl betaine, cocamidopropyl betaine, sodium lauroamphoacetate, sodium cocoamphoacetate, coconut oil fatty acid amidopropyl betaine, lauryl betaine (lauryl dimethylaminoacetic acid betaine), and sodium lauryl aminopropionate.

[0052] Examples of nonionic surfactants include ether-type nonionic surfactants, ester-type nonionic surfactants, and alkyl glucosides. Examples of ether-type nonionic surfactants include POE cetyl ether, POE stearyl ether, POE behenyl ether, POE oleyl ether, POE lauryl ether, POE octyldodecyl ether, POE hexyldecyl ether, POE isostearyl ether, POE nonylphenyl ether, POE octylphenyl ether, POE / POP cetyl ether, and POE / POP decyltetradecyl ether.

[0053] Examples of ester-type nonionic surfactants include POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan monopalmitate, POE sorbitan monolaurate, POE sorbitan trioleate, POE glycerin monostearate, POE glycerin monomyristate, POE sorbit tetraoleate, POE sorbit hexastearate, POE sorbit monolaurate, POE sorbit beeswax, polyethylene glycol monooleate, and polyethylene glycol monostearate. Examples of suitable glyceryl monostearate include glyceryl monolaurate, 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, and decaglyceryl monomyristate.

[0054] Examples of alkyl glucosides include alkyl (C8 to C 16 ) glucoside, POE methyl glucoside, POE dioleate methyl glucoside, etc. Of these surfactants, only one type may be contained alone, or two or more types may be contained.

[0055] Examples of water-soluble polymers include natural polymers, semi-synthetic polymers, synthetic polymers, and inorganic polymers. Examples of sugars include sorbitol, maltose, glycosyl trehalose, and N-acetylglucosamine. Examples of preservatives include phenoxyethanol, paraben, methylparaben, and sodium benzoate. Examples of antioxidants include ascorbic acid and anhydrous sodium sulfite. Examples of chelating agents include diethylenetriaminepentaacetate and hydroxyethanediphosphonate. Examples of stabilizers include phenacetin, 8-hydroxyquinoline, acetanilide, and sodium pyrophosphate. Examples of amino acids include threonine, theanine, and taurine. Examples of inorganic salts include sodium chloride. Only one of these components may be contained alone, or two or more may be contained.

[0056] [pH] The pH of the hair bleach / bleaching or hair dye composition is not particularly limited, but is preferably 7.0 or higher, more preferably 9.0 or higher. The pH is preferably 12.0 or lower, more preferably 11.0 or lower. By adjusting the pH to an alkaline level, high hair dyeing and bleaching / dyeing power can be obtained. The pH of the hair bleach / bleaching or hair dye composition refers to the pH of the hair bleach / bleaching or hair dye composition at the time of use. For example, in the case of a two-component composition, the pH refers to the pH of the mixture obtained by mixing the first and second components. The pH is also the value measured at 25°C for a 10% by weight aqueous solution of the hair bleach / bleaching or hair dye composition, obtained by diluting the stock solution 10 times with water. [Example]

[0057] [Preparation of Hair Bleaching Composition] Emulsified first and second agents containing the components shown in Tables 1 and 2 were prepared according to standard methods. In each table, the unit of the numerical values ​​representing the content of each component is % by mass. The sodium hydroxide aqueous solution in the table was added in an appropriate amount to achieve the desired pH. Next, the first and second parts were mixed in a mass ratio of 1:1 to prepare a hair bleach composition.

[0058] [evaluation] The prepared hair bleach compositions were evaluated as follows. The evaluation results are shown in the lower columns of Tables 1 and 2.

[0059] (cysteic acid content) The resulting hair bleach composition was applied to a 10 cm long bundle of black human hair (manufactured by Beaulux Co., Ltd.) using a brush at a ratio of 1 g of hair bleach composition per 1 g of hair bundle, and the hair was left to stand at room temperature for 30 minutes. After rinsing off the hair bleach composition, the hair bundle was washed twice with a 10-fold diluted aqueous solution of lauryl betaine ("Amogen (registered trademark) SH", manufactured by Daiichi Kogyo Seiyaku Co., Ltd.). The hair bundle was then dried with warm air.

[0060] In addition, as a control, a hair bundle was prepared that was not bleached with the hair bleach composition, but was similarly treated only with an aqueous solution of lauryl betaine diluted 10 times. ATR-FTIR spectra of the hair surface were measured using hair samples taken from the resulting hair bundle. The spectra were measured using an infrared spectrometer with a resolution of 0.5 μm. The absorbance attributable to cysteic acid was calculated from the obtained spectra. The ratio of the absorbance of the bleached hair bundle to the absorbance of the unbleached hair bundle was then calculated, and the amount of cysteic acid was evaluated according to the following criteria.

[0061] 5: Ratio is 2.3 or less. 4: Ratio is greater than 2.3 and less than or equal to 2.5. 3: Ratio is greater than 2.5 and less than or equal to 2.8. 2: The ratio is greater than 2.8 and less than or equal to 3.0. 1: The ratio is greater than 3.0.

[0062] ATR-FTIR can measure the amount of cysteic acid present in the surface layer of hair, specifically the amount of cysteic acid present in the cuticle layer of hair. In other words, the higher the ratio obtained by this measurement, the greater the damage to the hair cuticle.

[0063] (tensile strength) Bleached hair bundles were prepared in the same manner as for measuring the amount of cysteic acid. Twenty random hair samples were sampled from the resulting hair bundles, and a tensile test was performed on each hair sample in water at 25°C. The tensile test was performed under conditions of a sample length of 20 mm and a tensile speed of 20 mm / sec. A tension-compression tester manufactured by Imada Seisakusho Co., Ltd. was used for the tensile test. A control hair bundle was also prepared without bleaching treatment, and 20 random hair samples were sampled and similarly subjected to a tensile test. Separately, the cross-sectional area of ​​each hair sample was calculated according to the following formula 1, and the calculated cross-sectional area was used to calculate the breaking stress of each hair sample. (average hair diameter / 2) 2 ×3.14 · · · Formula 1

[0064] The average breaking stress of unbleached hair and the average breaking stress of bleached hair were calculated, and the average values ​​were used to calculate the reduction in breaking stress of bleached hair relative to the breaking stress of unbleached hair. A reduction in breaking stress of 5% or less was evaluated as "A (= pass)," and a reduction in breaking stress of more than 5% was evaluated as "B (= fail)." Tensile strength represents the strength of the entire hair, including the cuticle layer and the cortex layer. Therefore, the greater the rate of decrease in tensile strength, the greater the damage to the entire hair.

[0065] (bleaching power) The hair bundle was bleached in the same manner as in the measurement of the amount of cysteic acid. The L* value of the bleached hair bundle was measured using a spectrophotometer. The bleaching power (bleaching power) of the bleaching composition was then evaluated according to the following criteria.

[0066] 5: L* value is 23 or higher, and bleaching power is extremely high. 4: The L* value is 21 or more but less than 23, and the bleaching power is somewhat high. 3: L* value is 19 or more but less than 21, and bleaching power is high. 2: The L* value is 15 or more but less than 19, and the bleaching power is somewhat low. 1: L* value is less than 15, and bleaching power is low.

[0067] (odor) Approximately 5 g of the bleaching composition was placed on a plate, and five expert panelists judged whether it had the distinctive ammonia odor, or whether it had no or very little odor. If three or more panelists judged it to have an odor, it was rated as "B (= Fail)," and if two or fewer panelists judged it to have an odor, it was rated as "A (= Pass)."

[0068] (Formulation stability) Approximately 20 g of the first agent was placed in a transparent glass airtight container and left in a thermostatic chamber at 50°C for one day. After that, five expert panelists visually inspected the state of separation of each agent and scored it according to the following criteria.

[0069] 5: No separation at all. 4: Almost no separation has occurred. 3: Not very separated. 2: Slightly separated. 1: Large separation.

[0070] The average scores of the five panelists were calculated, and an average score of 4.6 or more was rated as "excellent: 5", 3.6 to less than 4.6 was rated as "good: 4", 2.6 to less than 3.6 was rated as "fair: 3", 1.6 to less than 2.6 was rated as "slightly poor: 2", and less than 1.6 was rated as "poor: 1". [Table 1]

[0071] [Table 2]

[0072] [Consideration] As shown in Comparative Example 1, the hair bleach composition containing ammonia as an alkaline agent had a low amount of cysteic acid, but the tensile strength was insufficient. Therefore, it was found that when ammonia is used as an alkaline agent, damage to the cuticle, which is the outer layer of the hair, is relatively suppressed, but damage to the cortex is relatively severe, resulting in a decrease in the overall strength of the hair. Furthermore, Comparative Example 1 also had a distinctive odor caused by ammonia.

[0073] On the other hand, as shown in Comparative Example 2, a hair bleach composition containing component (B) instead of ammonia as the alkaline agent had good tensile strength but contained a large amount of cysteic acid. Therefore, it was found that when component (B) is used as the alkaline agent, damage to the cortex is relatively suppressed and the overall strength of the hair is high, but damage to the cuticle is relatively severe.

[0074] In contrast, as shown in Examples 1 to 21, hair bleach compositions containing component (A) and component (B) maintained good tensile strength while reducing the amount of cysteic acid. Therefore, it was found that the incorporation of component (A) can reduce cuticle damage caused by component (B), thereby suppressing overall hair damage. Furthermore, as shown in Comparative Example 3, when ammonia was used as the alkaline agent, the incorporation of component (A) did not significantly affect the evaluation.

[0075] Furthermore, as shown in Examples 1 to 21, the hair bleach composition containing component (A) and component (B) had high bleaching power, did not have the distinctive smell of ammonia, and had high formulation stability.

[0076] As shown in Examples 1 to 6, among the components (A), folic acid and ε-aminocaproic acid showed particularly high effects of reducing cuticle damage, followed by acetic acid and nicotinic acid, and then glutamic acid and aspartic acid.

[0077] Furthermore, when Examples 1, 7, and 8 are compared, the hair bleach composition containing ammonium bicarbonate or ammonium carbonate as component (B) had a stronger bleaching power than the hair bleach composition containing sodium bicarbonate.

[0078] Furthermore, as shown in Example 9, a hair bleach composition containing ammonia as an alkaline agent together with component (B) also had the effect of reducing cuticle damage. Furthermore, as shown in Examples 1, 10 to 12, the bleaching power was further improved when the content of component (A) in the hair bleach composition (i.e., the content of component (A) in the mixture of the first and second agents) was less than 1.5% by mass, preferably less than 1.1% by mass.

[0079] Furthermore, as shown in Examples 1, 13 to 16, when the (B) / (C) ratio was 0.2 or more, the effect of reducing cuticle damage was greater than when the (B) / (C) ratio was less than 0.2. Furthermore, bleaching power was further improved when the content of component (B) in the hair bleach composition was 0.1% by mass or more, preferably 0.6% by mass or more. Furthermore, bleaching power was further improved when the content of component (C) in the hair bleach composition was 1.2% by mass or more, preferably 2% by mass or more.

[0080] Furthermore, as shown in Examples 1 and 10 to 12, formulation stability was further improved when the content of component (A) in the first pack was less than 3.0% by mass, preferably less than 2.5% by mass, and as shown in Examples 1 and 13 to 16, formulation stability was further improved when the content of component (B) in the first pack was less than 5.0% by mass, preferably less than 3.0% by mass.

[0081] Furthermore, as shown in Examples 20 and 21, even when component (A) was contained in the second agent instead of the first agent, the effect of reducing cuticle damage was similar. In Examples 20 and 21, the formulation stability of the second agent was also evaluated in the same manner as for the first agent, and the formulation stability of the second agent was evaluated as 5 in both cases.

Claims

1. A hair bleaching / dyeing agent or hair dye composition comprising (A) an acid and (B) at least one selected from a carbonate and a bicarbonate, the component (A) contains at least one selected from ε-aminocaproic acid, acetic acid, nicotinic acid, and folic acid, A hair bleaching / dyeing agent or hair dye composition, wherein the content of the component (A) in the hair bleaching / dyeing agent or hair dye composition is less than 2.0% by mass.

2. 2. The hair bleach / dyeing agent or hair dye composition according to claim 1, wherein the content of the component (B) in the hair bleach / dyeing agent or hair dye composition is 0.01% by mass or more and less than 3.5% by mass.

3. 3. The hair bleach / bleaching or hair dye composition according to claim 1, further comprising an oxidizing agent (C), wherein the mass ratio of the content of the component (B) in the hair bleach / bleaching or hair dye composition to the content of the component (C) in the hair bleach / bleaching or hair dye composition is 0.001 or more and less than 2.

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