Hair bleaching and decolorizing composition

Abstract

The present invention provides a hair bleaching and decolorizing composition that does not reduce the miscibility with other agents containing oxidizing agents during use and reduces the scattering of persulfates. [Solution] The hair bleaching and decolorizing composition of the present invention is characterized by comprising a persulfate-containing composition that contains (A) silicate as an alkaline agent, (B) persulfate as an oxidizing agent, and (C) an oily component that is liquid at 25°C and does not contain water, and an oxidizing agent-containing composition that contains an oxidizing agent.

Description

Technical Field

[0001] The present invention relates to a hair bleaching and decoloring composition comprising a persulfate-containing composition containing an oily component and an oxidizing agent-containing composition containing an oxidizing agent.

Background Art

[0002] Generally, a hair bleaching and decoloring composition that exhibits an effect by mixing a plurality of agents is known. As such a hair bleaching and decoloring composition, for example, a hair bleaching and decoloring composition comprising a powdery persulfate-containing composition containing a persulfate, an alkali agent, etc., and an oxidizing agent-containing composition containing hydrogen peroxide, etc. is known. However, when mixing the powdery persulfate-containing composition and a liquid agent during use, there has been a problem of scattering.

[0003] Conventionally, a hair bleaching and decoloring composition as disclosed in Patent Document 1 has been known. Such a hair bleaching and decoloring composition incorporates an oily component such as petrolatum into the persulfate-containing composition in order to suppress scattering during use.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the persulfate-containing composition incorporating an oily component has a problem of poor miscibility with a separate agent containing an oxidizing agent.

Means for Solving the Problems

[0006] This invention relates to a persulfate-containing composition that incorporates a silicate as an alkaline agent and an oily component that is liquid at 25°C. The invention is based on the finding that this reduces scattering without decreasing the miscibility with other agents containing oxidizing agents during use.

[0007] The following describes various methods for solving the above problems. The hair bleaching and decolorizing composition of Embodiment 1 is characterized by comprising a persulfate-containing composition containing (A) silicate as an alkaline agent, (B) persulfate as an oxidizing aid, and (C) an oily component that is liquid at 25°C and does not contain water, and an oxidizing agent-containing composition containing an oxidizing agent.

[0008] Embodiment 2 is the hair bleaching and decolorizing composition described in Embodiment 1, wherein the content of the oily component that is liquid at 25°C in the persulfate-containing composition is 2% by mass or more and 15% by mass or less.

[0009] Embodiment 3 is a hair bleaching and decolorizing composition according to Embodiment 1 or 2, wherein the mass ratio (A / C) of the content of (A) silicate to the content of (C) liquid oily component at 25°C in the persulfate-containing composition is 1 or more and 50 or less. [Effects of the Invention]

[0010] The hair bleaching and decolorizing composition of the present invention does not reduce the mixability during use and reduces scattering. [Modes for carrying out the invention]

[0011] The following describes one embodiment of the hair bleaching and decolorizing composition of the present invention. The hair bleaching and decolorizing composition is composed as a multi-component composition, for example, a two-component hair bleaching and decolorizing composition or a three-component hair bleaching and decolorizing composition. The following describes an example of the composition of a two-component hair bleaching and decolorizing composition.

[0012] (Two-part hair bleaching and decolorizing composition) A two-part hair bleaching and decolorizing composition comprises a first component, which is a persulfate-containing composition containing an alkaline agent, an oxidizing agent, etc., and a second component, which is an oxidizing agent-containing composition containing an oxidizing agent, etc.

[0013] (First drug) The first agent contains an alkaline agent, an oxidizing agent, etc., as described above. (Alkaline agent) The product contains (A) silicate as an alkaline agent. The alkaline agent promotes the action of the oxidizing agent contained in the second agent, described later, and improves the hair bleaching effect. The inclusion of (A) silicate as an alkaline agent improves the mixability with the second agent during use. Specific examples of (A) silicate include sodium silicate, potassium silicate, calcium silicate, etc. These (A) silicates may be included individually or in combination of two or more types.

[0014] In addition to the (A) silicate used in this embodiment, metasilicates and orthosilicates are compounds composed of two components (anhydrous: e.g., M(I)2O·nSiO2) or three components (e.g., M(I)2O·nSiO2·mH2O) by adding water. Note that M(I)2O can also be replaced with M(II)O or M(III)2O3.

[0015] (A) Silicates, metasilicates, and orthosilicates are distinguished by the ratio of these components (Gypsum & Lime No.231 (1991) pp. 131-141). Note that metasilicates and orthosilicates are not included in (A) silicates. Examples of (A) silicates include sodium silicate: Na2O·nSiO2·mH2O (n=2~4).

[0016] This does not preclude the incorporation of alkaline agents other than (A) silicate, as long as it does not impede the effects of the present invention. However, the content of alkaline agents other than (A) silicate in the total alkaline agents is preferably 20% by mass or less, more preferably 10% by mass or less, even more preferably 5% by mass or less, and particularly preferably 1% by mass or less.

[0017] (A) Examples of alkaline agents other than silicates include those that are solid at room temperature. Examples of alkaline agents include carbonates, bicarbonates, carbamates, metasilicates, phosphates, organic amines, and basic amino acids. Specific examples of carbonates include sodium carbonate and ammonium carbonate. Specific examples of bicarbonates include sodium bicarbonate and ammonium bicarbonate. Specific examples of carbamates include ammonium carbamate. Specific examples of metasilicates include sodium metasilicate and potassium metasilicate. Specific examples of phosphates include triammonium phosphate and diammonium hydrogen phosphate. Specific examples of organic amines include 2-amino-2-methyl-1-propanol (AMP), 2-amino-2-methyl-1,3-propanediol, and guanidine. Specific examples of basic amino acids include arginine and lysine. These alkaline agents may be contained individually or in combination of two or more types.

[0018] When the hair bleaching / decolorizing composition is applied to the hair, the amount of alkaline agent in the mixture of the first and second agents is preferably such that the pH is in the range of 7 to 12, and more preferably such that the pH is in the range of 9 to 12, when the hair bleaching / decolorizing composition is applied to normal bleaching / decolorizing treatments. Setting the pH of the mixture to 7 or higher can promote the action of the oxidizing agent contained in the second agent. Setting the pH of the mixture to 12 or lower can suppress damage to the hair caused by the application of the mixture. The pH of the mixture shall be measured at 25°C when the mixture of each agent is diluted 10 times with water and dissolved at a concentration of 10% by mass.

[0019] The lower limit of the content of (A) silicate in the mixture is appropriately set, but is preferably 3% by mass or more, more preferably 6% by mass or more, and still more preferably 10% by mass or more. When such content is 3% by mass or more, the hair bleaching power is further improved. The upper limit of the content of (A) silicate is appropriately set, but is preferably 25% by mass or less, more preferably 20% by mass or less. When such content is 25% by mass or less, the hair bleaching power is efficiently improved. In addition, the range obtained by arbitrarily combining the above upper and lower limits is also assumed.

[0020] (Oxidation aid) The first agent contains (B) persulfate as an oxidation aid. Specific examples of (B) persulfate include, for example, ammonium persulfate, potassium persulfate, sodium persulfate, and the like. These persulfates may be used alone or in combination of two or more.

[0021] In the mixture, the lower limit of the content of (B) persulfate is appropriately set, but is preferably 3% by mass or more, more preferably 5% by mass or more, and still more preferably 10% by mass or more. When the content of (B) persulfate is 3% by mass or more, the hair bleaching power is further improved. The upper limit of the content of (B) persulfate is appropriately set, but is preferably 25% by mass or less, more preferably 20% by mass or less. When the content of (B) persulfate is 25% by mass or less, the hair bleaching power can be efficiently improved. In addition, the range obtained by arbitrarily combining the above upper and lower limits is also assumed.

[0022] ((C) Oil-based component liquid at 25°C) (C) The oil-based component liquid at 25°C is blended to suppress the scattering of (B) persulfate in the first agent during use.

[0023] Specific examples of the oily component that is liquid at 25°C include, for example, hydrocarbons that are liquid at 25°C, fats and oils such as animal oils and vegetable oils that are liquid at 25°C, waxes that are liquid at 25°C, higher alcohols that are liquid at 25°C, higher fatty acids that are liquid at 25°C, esters that are liquid at 25°C, silicones that are liquid at 25°C, and the like.

[0024] Specific examples of the hydrocarbon that is liquid at 25°C include, for example, α-olefin oligomers, light isoparaffins, light fluid isoparaffins, synthetic squalane, vegetable squalane, squalane, polybutene, fluid isoparaffins, fluid paraffins, and the like. Specific examples of the fats and oils such as animal oils and vegetable oils that are liquid at 25°C include, for example, olive oil, camellia oil, sasanqua oil, sunflower oil, soybean oil, corn oil, peanut oil, rapeseed oil, rice bran oil, grape seed oil, macadamia nut oil, castor oil, coconut oil, almond oil, meadowfoam oil, and the like. Specific examples of the wax that is liquid at 25°C include, for example, jojoba oil and the like. Specific examples of the higher alcohol that is liquid at 25°C include, for example, lauryl alcohol, isostearyl alcohol, 2-octyldodecanol, decyltetradecanol, oleyl alcohol, 2-hexyldecanol, and the like.

[0025] Examples of high-grade fatty acids that are liquid at 25°C include isostearic acid and oleic acid. Specific examples of esters that are liquid at 25°C include, for example, diisopropyl adipate, isostearyl myristate, isotridecyl myristate, isopropyl myristate, octyldodecyl myristate, cetyl octanoate, isononyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, diisopropyl sebacate, isopropyl palmitate, hexyl laurate, decyl oleate, hexyldecyl dimethyloctanoate, octyl palmitate, lauryl lactate, octyldodecyl lactate, isocetyl stearate, isocetyl isostearate, ethylene glycol dioctanoate, cetyl caprylate, glyceryl tricaprylate, neopentyl glycol dicaprate, cetyl 2-ethylhexanoate, triglycerides that are liquid at 25°C, and amino acid esters that are liquid at 25°C. Specific examples of triglycerides include glyceryl trioleate, glyceryl tristearate, and glyceryl tripalmitate. Specific examples of amino acid esters include di(cholesteryl / octyldodecyl) N-lauroyl-L-glutamate. Specific examples of silicones that are liquid at 25°C include methylpolysiloxane and highly polymerized methylpolysiloxane with a molecular weight of less than 150,000, methylphenylpolysiloxane, and methylcyclopolysiloxane.

[0026] These oily components may be present individually or in combination of two or more. (C) As for the oily components that are liquid at 25°C, hydrocarbons and oils are preferred, and hydrocarbons are particularly preferred, from the viewpoint of excellent decolorization properties. Among hydrocarbons, liquid paraffins, liquid isoparaffins, squalane, and α-olefin oligomers are preferred, and liquid paraffins are particularly preferred.

[0027] In the first agent, the lower limit of the content of the (C) liquid oily component at 25°C is set as appropriate, but is preferably 1% by mass or more, more preferably 2% by mass or more, and even more preferably 3% by mass or more. When the content of the (C) liquid oily component at 25°C is 1% by mass or more, the scattering of (B) persulfate in the first agent can be further suppressed during use. In the first agent, the upper limit of the content of the (C) liquid oily component at 25°C is set as appropriate, but is preferably 25% by mass or less, more preferably 20% by mass or less, and even more preferably 15% by mass or less. When the content of the (C) liquid oily component at 25°C is 25% by mass or less, the scattering of (B) persulfate can be efficiently suppressed. In addition, the amount of oxidizing agent blended in the first agent can be increased. It should be noted that a range of arbitrary combinations of the above upper and lower limits is also conceivable.

[0028] In the first agent, the lower limit of the mass ratio (A / C) of the content of (A) silicate to the content of (C) liquid oily component at 25°C is set as appropriate, but is preferably 1 or more, more preferably 2 or more, and even more preferably 3 or more. When the lower limit of this mass ratio is 1 or more, the miscibility with the second agent can be further improved. On the other hand, the upper limit of this mass ratio (A / C) is set as appropriate, but is preferably 50 or less, more preferably 40 or less, and even more preferably 30 or less. When the upper limit of this mass ratio is 50 or less, the scattering of (B) persulfate in the first agent can be further suppressed during use. It should be noted that a range of arbitrary combinations of the above upper and lower limits is also conceivable.

[0029] ((D)Carboxylate that is solid at 25°C) The first agent may optionally contain a carboxylate that is solid at (D)25°C. The carboxylate that is solid at (D)25°C is added as a hair damage reducing agent.

[0030] Specific examples of carboxylate salts that are solid at 25°C include, for example, salts of organic acids such as citric acid, tartaric acid, succinic acid, and ascorbic acid, salts of edetic acid (ethylenediaminetetraacetic acid (EDTA)), and salts of ethylenediamine hydroxyethyl triacetic acid. Specific examples of salts include, for example, sodium salts, potassium salts, and ammonium salts. These (D) carboxylate salts that are solid at 25°C may be contained individually or in combination of two or more types.

[0031] In the mixture, the lower limit of the content of component (D) is set as appropriate, but is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.5% by mass or more. When the content of component (D) is 0.01% by mass or more, the effect of reducing hair damage can be further improved. In the mixture, the upper limit of the content of component (D) is set as appropriate, but is preferably 10% by mass or less, more preferably 5% by mass or less. When the content of component (D) is 10% by mass or less, the effect of reducing hair damage can be efficiently improved. It should be noted that a range of arbitrary combinations of the above upper and lower limits is also conceivable.

[0032] (Other ingredients) The first agent may further contain, if necessary, other components other than those mentioned above, such as water-soluble polymers, oily components that are solid at 25°C, polyhydric alcohols, surfactants, pH adjusters other than those mentioned above, sugars, preservatives, stabilizers, plant extracts, herbal extracts, vitamins, fragrances, antioxidants, chelating agents other than those mentioned above, ultraviolet absorbers, etc.

[0033] Water-soluble polymers impart appropriate viscosity to the mixture. Therefore, the first agent may contain a water-soluble polymer within a range that does not impair the effects of the present invention. Examples of water-soluble polymers include natural polymers, semi-synthetic polymers, synthetic polymers, and inorganic polymers.

[0034] Specific examples of natural water-soluble polymers include guar gum, locust bean gum, quince seed gum, carrageenan, galactan, gum arabic, tragacanth gum, pectin, mannan, xanthan gum, dextran, succinoglucan, curdlan, hyaluronic acid, gelatin, casein, albumin, collagen, and dextrin.

[0035] Specific examples of semi-synthetic water-soluble polymers include, for example, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxyethylcellulose dimethyldiallylammonium chloride, hydroxypropylcellulose, carboxymethylcellulose, carboxymethylcellulose sodium, hydroxypropylmethylcellulose, cationized cellulose, cationized guar gum, starch phosphate esters, propylene glycol alginate esters, alginates, and the like.

[0036] Specific examples of synthetic water-soluble polymers include, for example, polyvinyl caprolactam, polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), vinylpyrrolidone-vinyl acetate (VP / VA) copolymer, polyvinyl butyral, polyvinyl methyl ether, carboxyvinyl polymer, sodium polyacrylate, polyacrylamide, polyethylene oxide, ethylene oxide-propylene oxide block copolymer, acrylic acid / alkyl acrylate copolymer, polydimethylmethylenepiperidinium chloride, polyethylene glycol, and high-polymer polyethylene glycol. Furthermore, specific examples of synthetic polymers include, for example, a semi-ester of itaconic acid and polyoxyethylene (hereinafter referred to as "POE") alkyl ether, or a copolymer consisting of an ester of methacrylic acid and POE alkyl ether, and at least one monomer selected from acrylic acid, methacrylic acid, and their alkyl esters.

[0037] Specific examples of inorganic polymers include bentonite, magnesium aluminum silicate, laponite, hectorite, and anhydrous silicic acid. These water-soluble polymers may be present individually or in combination of two or more types.

[0038] Oily components that are solid at 25°C may be added to the present invention, within limits that do not hinder the effects of the present invention, to provide moisture to the hair, emulsify the hair bleaching / decolorization composition, adjust viscosity, or improve viscosity stability. Examples of oily components that are solid at 25°C include hydrocarbons that are solid at 25°C, animal and vegetable oils and fats that are solid at 25°C, waxes that are solid at 25°C, higher alcohols that are solid at 25°C, alkyl glyceryl ethers, higher fatty acids that are solid at 25°C, esters that are solid at 25°C, and silicones that are solid at 25°C.

[0039] Specific examples of hydrocarbons that are solid at 25°C include paraffin, polyethylene powder, microcrystalline wax, and petrolatum, all of which are solid at 25°C. Specific examples of animal and vegetable oils that are solid at 25°C include cocoa butter, shea butter, palm butter, hydrogenated palm kernel oil, and hydrogenated castor oil.

[0040] Examples of waxes that are solid at 25°C include beeswax, candelilla wax, carnauba wax, lanolin, and rice bran wax. Examples of higher alcohols that are solid at 25°C include myristyl alcohol, cetanol, stearyl alcohol, arachidyl alcohol, behenyl alcohol, and lanolin alcohol. Examples of alkyl glyceryl ethers include batyl alcohol, chymyl alcohol, cerachidyl alcohol, and isostearyl glyceryl ether.

[0041] Specific examples of higher fatty acids that are solid at 25°C include, for example, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, hydroxystearic acid, undecylenic acid, and ricinoleic acid. Specific examples of esters that are solid at 25°C include, for example, butyl stearate, stearyl stearate, cetyl myristate, myristyl myristate, cetyl palmitate, cetyl lactate, myristyl lactate, lanolin acetate, cholesteryl stearate, cholesteryl oleate, oleyl oleate, dioctyl succinate, and diethoxyethyl succinate. Specific examples of silicones that are solid at 25°C include, for example, highly polymerized methylpolysiloxane with a molecular weight of 150,000 or more. These oily components may be contained individually or in combination of two or more types.

[0042] Examples of polyhydric alcohols include glycols and glycerin. Specific examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, high-polymer polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, isoprene glycol, and 1,3-butylene glycol. Specific examples of glycerin include glycerin, diglycerin, and polyglycerin. These polyhydric alcohols may be included individually or in combination of two or more.

[0043] Surfactants, acting as emulsifiers or solubilizers for each component, emulsify or solubilize the hair bleaching / decolorization composition at the time of use, adjusting viscosity or improving viscosity stability. Therefore, the first agent may contain surfactants within a range that does not hinder the effects of the present invention. Examples of surfactants include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants.

[0044] Specific examples of anionic surfactants include alkyl ether sulfates, alkyl sulfates, alkyl ether sulfate esters, alkenyl ether sulfates, alkenyl sulfates, olefin sulfonates, alkanesulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, α-sulfone fatty acid salts, N-acyl amino acid type surfactants, phosphate mono or diester type surfactants, sulfosuccinate esters, and their derivatives. Specific examples of counterions for the anionic groups of these surfactants include sodium ions, potassium ions, and triethanolamine. More specifically, an example of alkyl ether sulfate ester is sodium POE lauryl ether sulfate. Specific examples of alkyl sulfates include sodium lauryl sulfate and sodium cetyl sulfate. Specific examples of alkyl sulfate derivatives include sodium POE lauryl sulfate. Specific examples of sulfosuccinate esters include disodium lauryl sulfosuccinate.

[0045] Specific examples of cationic surfactants include, for example, lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, alkyltrimethylammonium chloride, distearyldimethylammonium chloride, cetyltrimethylammonium bromide, stearyltrimethylammonium bromide, lanolin fatty acid aminopropylethyldimethylammonium ethyl sulfate, stearyltrimethylammonium saccharin, cetyltrimethylammonium saccharin, methacryloyloxyethyltrimethylammonium chloride, and behenyltrimethylammonium methyl sulfate.

[0046] Specific examples of amphoteric surfactants include, for example, cocobetaine, lauramidopropyl betaine, cocamidopropyl betaine, sodium lauroamphoacetate, sodium cocoamphoacetate, coconut oil fatty acid amidopropyl betaine, and lauryl betaine (lauryldimethylaminoacetate betaine).

[0047] Specific examples of nonionic surfactants include ether-type nonionic surfactants, ester-type nonionic surfactants, and alkyl glucosides. Specific examples of ether-type nonionic surfactants include POE cetyl ether (ceteth), POE stearyl ether (steareth), POE behenyl ether, POE oleyl ether (oleth), POE lauryl ether (laureth), POE octyldodecyl ether, POE hexyldecyl ether, POE isostearyl ether, POE nonylphenyl ether, and POE octylphenyl ether.

[0048] Specific examples of ester-type nonionic surfactants include, for example, POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan monopalmitate, POE sorbitan monolaurate, POE sorbitan trioleate, POE glycerin monostearate, POE glycerin monomyristate, POE sorbitan tetraoleate, POE sorbitan hexastearate, POE sorbitan monolaurate, POE sorbitan beeswax, polyethylene glycol monooleate, and polyethylene monostearate. Examples include polyethylene glycol, 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 the like.

[0049] Specific examples of alkyl glucosides include alkyl (8-16 carbon atoms) glucosides, POE methyl glucosides, and POE methyl dioleate glucosides. These surfactants may be included individually or in combination of two or more types.

[0050] pH adjusters may be added to adjust the pH of the mixture. Examples of pH adjusters include inorganic acids, organic acids, and their salts. Specific examples of inorganic acids include phosphoric acid, hydrochloric acid, nitric acid, sulfuric acid, and boric acid. Specific examples of phosphoric acid include orthophosphoric acid, polyphosphoric acid, pyrophosphoric acid, and metaphosphoric acid. Specific examples of salts include sodium salts, potassium salts, and ammonium salts. Specific examples of sugars include monosaccharides such as glucose and galactose, disaccharides such as maltose, sucrose, fructose, and trehalose, and sugar alcohols. Specific examples of preservatives include parabens, methylparaben, and sodium benzoate. Specific examples of stabilizers include phenacetin, 8-hydroxyquinoline, acetanilide, sodium pyrophosphate, barbituric acid, uric acid, and tannic acid. Specific examples of antioxidants include ascorbic acid and sulfites.

[0051] (Dosage form) The first agent is prepared in a form that does not contain water in order to improve the storage stability of (B) persulfate. "Does not contain water" means that the first agent is substantially water-free. "Substantially water-free" means that it does not contain water as an ingredient, and does not exclude small amounts of water that are incidentally contained in other ingredients. More specifically, it contains no water at all, or if it contains water incidentally, the content is 1% by mass or less.

[0052] The dosage form of the first agent may be liquid, cream, solid, etc. As a solid, it may be powder, granules, tablet, or tablet form. The first agent may also contain excipients and dispersants as other ingredients.

[0053] Specific examples of excipients include sodium sulfate and magnesium carbonate. Specific examples of dispersants include metal stearates such as calcium stearate and magnesium stearate, anhydrous silicic acid, talc, crystalline cellulose, starch, and low-substituted hydroxypropyl cellulose.

[0054] These other ingredients may be used individually or in combination of two or more. (Second drug) The second agent contains an oxidizing agent, a solubilizing agent, and, if necessary, other components as described above.

[0055] (Oxidizing agent) Oxidizing agents enhance the decolorizing properties of melanin contained in hair. Specific examples of oxidizing agents include hydrogen peroxide, urea peroxide, melamine peroxide, sodium percarbonate, sodium perborate, potassium perborate, ammonium persulfate, potassium persulfate, sodium persulfate, 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. Only one of these oxidizing agents may be included individually, or two or more may be included in combination.

[0056] The lower limit of the oxidizing agent content in the second agent is set as appropriate, but is preferably 0.1% by mass or more, more preferably 1.0% by mass or more, and even more preferably 1.5% by mass or more. When the oxidizing agent content is 0.1% by mass or more, the decolorizing effect of melanin can be further improved. The upper limit of the oxidizing agent content in the second agent is set as appropriate, but is preferably 15.0% by mass or less, more preferably 12.0% by mass or less, and even more preferably 9.0% by mass or less. When the oxidizing agent content is 15.0% by mass or less, damage to hair can be suppressed. Ranges that are arbitrary combinations of the above upper and lower limits are also conceivable.

[0057] When hydrogen peroxide is incorporated as an oxidizing agent in the second agent, the second agent preferably contains a stabilizer, such as sodium stannate, ethylene glycol phenyl ether (phenoxyethanol), hydroxyethanediphosphonic acid, or a salt thereof, in order to improve the stability of the hydrogen peroxide. Specific examples of hydroxyethanediphosphonic acid salts include, for example, tetrasodium hydroxyethanediphosphonic acid and disodium hydroxyethanediphosphonic acid.

[0058] Solubilizers are added, for example, to make the dosage form liquid. Examples of solubilizers used include water and organic solvents. Specific examples of organic solvents include ethanol, n-propanol, isopropanol, methyl cellosolve, ethyl cellosolve, methyl carbitol, ethyl carbitol, benzyl alcohol, phenethyl alcohol, γ-phenylpropyl alcohol, cinnamon alcohol, anise alcohol, p-methylbenzyl alcohol, α-dimethylphenethyl alcohol, α-phenylethanol, ethylene glycol phenyl ether (phenoxyethanol), phenoxyisopropanol, 2-benzyloxyethanol, N-alkylpyrrolidone, alkylene carbonate, alkyl ethers, etc. Of these specific examples of solubilizers, only one may be included alone, or two or more may be included in combination. Among these, water is preferred because it has excellent ability to dissolve other components in the second agent. When water is used as a solvent, the water content (content at the time of use) is preferably 40% by mass or more, and more preferably 50% by mass or more.

[0059] (Dosage form) The dosage form of the second agent is not particularly limited, and specific examples include liquid, gel, foam, cream, and solid. Examples of liquids include aqueous solutions, dispersions, and emulsions.

[0060] The first and second agents described above are mixed in appropriate ratios to obtain a mixture, which is then used in decolorization and destaining treatment according to conventional methods. The mixing ratio of the first agent to the second agent is not particularly limited and is set appropriately according to the dosage form, etc. The mixing ratio of the first agent to the second agent is, for example, 0.1~1:0.2~2, preferably 0.2~0.6:0.4~1.2. A range obtained by arbitrarily combining the above upper and lower limits is also conceivable. By specifying such a range, the mixability can be further improved.

[0061] (Effects of this embodiment) The effects of the hair bleaching and decolorizing composition of this embodiment will be explained. (1) The hair bleaching and decolorizing composition of this embodiment contains (A) silicate as an alkaline agent, (B) persulfate as an oxidizing agent, and (C) an oily component that is liquid at 25°C, and comprises a first agent without water. Therefore, it does not reduce the miscibility with the second agent which contains an oxidizing agent during use, and the scattering of (B) persulfate in the first agent can be reduced.

[0062] (2) When the content of liquid oily components at (C)25°C is specified to be 2% by mass or more in the first agent, the scattering of persulfates can be further suppressed. Also, when the content of liquid oily components at (C)25°C is specified to be 15% by mass or less in the first agent, the amount of oxidizing agent added in the first agent can be increased. This can improve the brightness of the hair after hair bleaching and decolorization treatment.

[0063] (3) When the mass ratio (A / C) of the content of (A) silicate to the content of liquid oily components at 25°C is 1 or more, the miscibility with the second agent can be further improved. When the mass ratio (A / C) of the content of (A) silicate to the content of liquid oily components at 25°C is 50 or less, the scattering of (B) persulfate in the first agent can be further suppressed during use.

[0064] (Example of change) Furthermore, the above embodiment can be implemented with the following modifications. The above embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0065] The first and second agents in the above embodiments may be prepared by preparing some of the components of each agent as separate agents and mixing them immediately before use, within the range that achieves the effects of the present invention. For example, during storage, some of the components constituting the first and second agents may be prepared as separate agents, further increasing the number of dosage forms, and the first and second agents may be prepared by mixing them immediately before use. [Examples]

[0066] Next, the embodiments described above will be explained in more detail with reference to examples and comparative examples. It should be noted that the present invention is not limited to the configurations described in the Examples section. First agents, containing persulfate, were prepared for each of the hair bleaching and decolorizing compositions shown in Table 1. Second agents, containing oxidizing agents, were also prepared for each of the hair bleaching and decolorizing compositions shown in Table 2. In each table, the numerical values ​​in the columns indicating each component represent the content of that component, and the unit is mass%. The notation of components (A) to (C) in the mixture indicates the content of each component in a mixture in which the first agent and the second agent are mixed in a 1:2 ratio. In the table, the notation (A) to (C) indicates the compounds corresponding to components (A) to (C) described in the claims of this application. (a) in the table indicates a comparative compound of component (A) described in the claims of this application.

[0067] The "(A) / (C) mass ratio" indicates the mass ratio (A / C) of the content of (A) silicate to the content of (C) liquid oily component at 25°C in the first agent. Furthermore, (A) sodium silicate was of the standard Na2O·nSiO2·mH2O (n=2~2.2), and (a) sodium metasilicate was of the standard Na2O·nSiO2 (n=0.9~1.1).

[0068] (brightness) Mixtures of the hair bleaching and decolorizing compositions for each example were obtained by mixing the first agent of each example listed in Table 1 with the second agent of each example listed in Table 2 in a 1:2 ratio.

[0069] Hair bundle samples (10 cm hair bundles from the same human hair, manufactured by Beaulux) were coated with a hair bleaching / decolorizing composition mixture in a mass ratio of 6:1 to the hair bundle and left at 30°C for 30 minutes. The hair bundles were then rinsed with water, shampooed twice with Hoyu's Bigen Treatment Shampoo, and rinsed once with Hoyu's Bigen Treatment Rinse. Subsequently, the hair bundles were dried with warm air to obtain the treated hair bundles for each example.

[0070] The bleaching power of the hair was determined by panelists visually judging which level (1-20) it corresponded to under a standard light source. The results are shown in the "Lightness (Lv)" column of Table 1. (mixability) Five expert panelists scored the mixing properties of the first agent in each example listed in Table 1 and the second agent listed in Table 2 when mixed in a 1:2 ratio.

[0071] The scoring criteria consisted of five levels: excellent (5 points), good (4 points), acceptable (3 points), slightly poor (2 points), and poor (1 point). The average score was calculated from the scores of five expert panelists. An average score of 4.6 points or higher was rated "Excellent: 5", 3.6 points or higher and less than 4.6 points was rated "Good: 4", 2.6 points or higher and less than 3.6 points was rated "Acceptable: 3", 1.6 points or higher and less than 2.6 points was rated "Slightly Poor: 2", and less than 1.6 points was rated "Poor: 1". The evaluation results are shown in the "Mixedness" column of Table 1.

[0072] (Cream-like consistency) Five expert panelists evaluated the properties of the mixtures obtained by mixing the first agent from each example listed in Table 1 with the second agent from Table 2 in a 1:2 ratio, assessing whether there were any remaining lumps and whether the mixture had excellent cream properties.

[0073] The scoring criteria consisted of five levels: excellent (5 points), good (4 points), acceptable (3 points), slightly poor (2 points), and poor (1 point). The average score was calculated from the scores of five expert panelists. An average score of 4.6 points or higher was rated as "Excellent: 5", 3.6 points or higher and less than 4.6 points as "Good: 4", 2.6 points or higher and less than 3.6 points as "Acceptable: 3", 1.6 points or higher and less than 2.6 points as "Slightly Poor: 2", and less than 1.6 points as "Poor: 1". The evaluation results are shown in the "Cream Properties" column of Table 1.

[0074] (Suppression of scattering) Five panelists visually assessed the amount of powder scattered when the first agent was dropped from a height of 50 centimeters, and evaluated whether the scattering was suppressed.

[0075] The scoring criteria consisted of five levels: excellent (5 points), good (4 points), acceptable (3 points), slightly poor (2 points), and poor (1 point). The average score was calculated from the scores of five expert panelists. An average score of 4.6 points or higher was rated as "Excellent: 5", 3.6 points or higher and less than 4.6 points as "Good: 4", 2.6 points or higher and less than 3.6 points as "Acceptable: 3", 1.6 points or higher and less than 2.6 points as "Slightly Poor: 2", and less than 1.6 points as "Poor: 1". The evaluation results are shown in the "Scatter Suppression" column of Table 1.

[0076] [Table 1]

[0077] [Table 2] As shown in Table 1, each example was confirmed to have achieved good or better results for each evaluation item. Comparative Example 1, which contains (a) sodium metasilicate but does not contain components (A) and (C), performed worse than each example in terms of mixability and dust suppression. Comparative Example 2, which contains (a) sodium metasilicate but does not contain component (A), performed particularly worse than each example in terms of mixability. Comparative Example 3, which does not contain component (C), performed particularly worse than each example in terms of dust suppression.

[0078] (Note) Next, we will add some technical ideas that can be gleaned from the above embodiments and alternative examples. (i) The hair bleaching and decolorizing composition further comprises a carboxylate that is solid at 25°C.

[0079] (b) The hair bleaching and decolorizing composition wherein the oily component that is liquid at 25°C is a hydrocarbon and / or a fat.

Claims

1. A hair bleaching and decolorizing composition characterized by comprising (A) silicate as an alkaline agent, (B) persulfate as an oxidizing aid, and (C) a persulfate-containing composition containing an oily component that is liquid at 25°C and does not contain water, and an oxidizing agent-containing composition containing an oxidizing agent.

2. The hair decolorization and decolorization composition according to claim 1, wherein the content of the oily component that is liquid at 25°C in the persulfate-containing composition is 2% by mass or more and 15% by mass or less.

3. The hair decolorization and decolorization composition according to claim 1 or 2, wherein in the persulfate-containing composition, the mass ratio (A / C) of the content of (A) silicate to the content of (C) liquid oily component at 25°C is 1 or more and 50 or less.

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