Bleaching power enhancer, oxidative hair dye, hair dyeing method, kit for oxidative hair dye, first agent for oxidative hair dye, hair bleach, hair bleaching method, kit for hair bleach, and first agent for hair bleach

Abstract

To provide a bleaching power enhancer that can enhance bleaching power, and an oxidative hair dye, a hair dyeing method, a kit, and a first agent for oxidative hair dye, characterized by having enhanced bleaching power.SOLUTION: An oxidative hair dye includes a bleaching power enhancer containing polypropylene glycol, and a first agent for oxidative hair dye, a second agent for oxidative hair dye, and, if present, a third agent for oxidative hair dye, to be used in mixture. The first agent for oxidative hair dye includes an oxidative dye and an alkaline agent, the second agent for oxidative hair dye includes an oxidizing agent, and the polypropylene glycol is included in at least one of the first agent for oxidative hair dye, the second agent for oxidative hair dye, and, if present, the third agent for oxidative hair dye.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a bleaching power enhancer, an oxidation hair dye, a hair dyeing method, an oxidation hair dye kit, a first agent for an oxidation hair dye, a hair bleach, a hair bleaching method, a hair bleach kit, and a first agent for a hair bleach. [Background technology]

[0002] Conventionally, hair bleaches, oxidative hair dyes, etc. have been widely used as two-component products consisting of a first component containing an alkaline agent and a second component containing an oxidizing agent such as hydrogen peroxide. When using the two-component oxidative hair dyes and hair bleaches mentioned above, the first and second components are mixed together, and the alkaline component in the first component breaks down the oxidizing component in the second component, generating oxygen. This oxygen then breaks down and bleaches the melanin in the hair, increasing the lightness of the hair. In oxidation hair dyes, the first agent contains an oxidative dye as well as an alkaline agent. By mixing this first agent with the second agent, which contains an oxidative agent, in addition to the decomposition and bleaching of melanin by oxygen as described above, the oxidative dye develops color in the cortex of the hair, resulting in hair dyeing.

[0003] Therefore, hair bleaches are required to have a high bleaching power (lightening power) that can decompose and bleach melanin to improve the brightness of hair. Also, oxidation hair dyes are required to have a high bleaching power in order to achieve more vivid hair coloring with oxidation dyes.

[0004] Attempts have been made to increase the bleaching power. For example, Patent Document 1 states that HCO3, which is liberated in water, is an essential component. - , PO4 3- , HSO4 - , HSO4 - , HSiO4 - , or HBO4 -The document describes a hair bleach characterized by containing one or more types of ions and a component that generates nascent oxygen, and having a pH of 4 to 8. The document describes that by adjusting the pH of the hair bleach to 4 to 8, damage to hair and irritation to the human body are alleviated, while the action of the ions can increase the amount of nascent oxygen compared to when hydrogen peroxide is simply used, thereby enhancing the bleaching power for hair. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 63-139115 Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the present invention is to provide a bleaching power enhancer capable of enhancing bleaching power, as well as an oxidative hair dye having higher bleaching power, a hair dyeing method, a kit for an oxidative hair dye, a first agent for an oxidative hair dye, a hair bleach, a hair bleaching method, a kit for a hair bleach, and a first agent for a hair bleach. [Means for solving the problem]

[0007] Means for Solving the Problems The present inventors have conducted extensive research to find a solution to the above problems, and have discovered that polypropylene glycol improves bleaching power, thereby completing the present invention.

[0008] That is, the present invention includes the following inventions. [1] A bleaching power enhancer containing polypropylene glycol. [2] A method of enhancing bleaching power by adding polypropylene glycol to a hair treatment product. [3] An oxidation hair dye comprising a mixture of a first agent for an oxidation hair dye, a second agent for an oxidation hair dye, and, if present, a third agent for an oxidation hair dye, The first agent for the oxidation hair dye contains an oxidation dye and an alkali agent, The second agent for the oxidation hair dye contains an oxidizing agent, An oxidation hair dye, comprising polypropylene glycol blended in at least one of the first agent for the oxidation hair dye, the second agent for the oxidation hair dye, and, if present, the third agent for the oxidation hair dye. [4] The oxidative hair dye according to [3], further comprising liquid paraffin in at least one of the first agent for the oxidative hair dye, the second agent for the oxidative hair dye, and, if present, the third agent for the oxidative hair dye. [5] An oxidative hair dye composition according to [3] or [4], which is not in foam form when used. [6] The oxidative hair dye described in [5], which is in cream form when used. [7] A hair dyeing method using the oxidative hair dye composition according to any one of [3] to [6].

[0009] [8] A kit for an oxidation hair dye comprising a first agent for an oxidation hair dye, a second agent for an oxidation hair dye, and, if present, a third agent for an oxidation hair dye, The first agent for the oxidation hair dye contains an oxidation dye and an alkali agent, The second agent for the oxidation hair dye contains an oxidizing agent, A kit for an oxidative hair dye, in which polypropylene glycol is blended in at least one of the first agent for the oxidative hair dye, the second agent for the oxidative hair dye, and, if present, the third agent for the oxidative hair dye. [9] The oxidative hair dye kit described in [8], further comprising liquid paraffin in at least one of the first agent for the oxidative hair dye, the second agent for the oxidative hair dye, and, if present, the third agent for the oxidative hair dye.

[10] A kit for an oxidation hair dye as described in [8] or [9], for making the oxidation hair dye into a non-foamy formulation when used.

[11] The oxidation hair dye kit according to

[10] , for forming the oxidation hair dye into a cream-like formulation when used.

[0010]

[12] The first agent for oxidative hair dyes, containing oxidative dyes, alkaline agents and polypropylene glycol.

[13] A first agent for an oxidation hair dye as described in

[12] , for making the oxidation hair dye into a non-foamy formulation during use.

[14] A first agent for an oxidative hair dye as described in

[13] , for making the oxidative hair dye into a cream-like formulation when used.

[0011]

[15] A hair bleach comprising a mixture of a first agent for the hair bleach, a second agent for the hair bleach, and, if present, a third agent for the hair bleach, The first agent for the hair bleach contains an alkaline agent, The second agent for the hair bleach contains an oxidizing agent, A hair bleach comprising polypropylene glycol in at least one of the first agent for the hair bleach, the second agent for the hair bleach, and, if present, the third agent for the hair bleach.

[16] The hair bleach according to

[15] , further comprising liquid paraffin in at least one of the first agent for the hair bleach, the second agent for the hair bleach, and, if present, the third agent for the hair bleach.

[17] A hair bleach according to

[15] or

[16] , which is not in foam form when used.

[18] The hair bleach according to

[17] , which is in cream form when used.

[19] A hair bleaching method using the hair bleaching agent according to any one of

[15] to

[18] .

[0012]

[20] A kit for a hair bleach comprising a first agent for the hair bleach, a second agent for the hair bleach, and, if present, a third agent for the hair bleach, The first agent for the hair bleach contains an alkaline agent, The second agent for the hair bleach contains an oxidizing agent, A kit for hair bleach, comprising polypropylene glycol blended in at least one of the first agent for the hair bleach, the second agent for the hair bleach, and, if present, the third agent for the hair bleach.

[21] The hair bleach kit described in

[20] , further comprising liquid paraffin in at least one of the first agent for the hair bleach, the second agent for the hair bleach, and, if present, the third agent for the hair bleach.

[22] A kit for a hair bleach according to

[20] or

[21] , for making the hair bleach into a non-foam-like formulation when used.

[23] A kit for a hair bleach according to

[22] , for forming the hair bleach into a cream-like formulation at the time of use.

[0013]

[24] The first agent for hair bleaching, containing an alkaline agent and polypropylene glycol.

[25] A first agent for a hair bleach as described in

[24] , for making the hair bleach into a non-foam-like formulation during use.

[26] A first agent for a hair bleach according to

[25] , for making the hair bleach into a cream-like formulation when used. Effect of the Invention

[0014] The bleaching power can be enhanced by the bleaching power enhancer and the method for enhancing bleaching power of the present invention. The oxidative hair dye, hair dyeing method, oxidative hair dye kit, and first agent for oxidative hair dye of the present invention provide higher bleaching power and achieve vivid hair dyeing. The hair bleach, hair bleaching method, hair bleach kit, and first agent for hair bleach of the present invention provide higher bleaching power. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention will be described below based on an embodiment of the present invention (hereinafter, also referred to as "the present embodiment").

[0016] 1. Bleaching power enhancer and method for enhancing bleaching power The bleaching power booster of the present embodiment is a bleaching power booster containing polypropylene glycol. Polypropylene glycol is a polymer of propylene glycol, specifically represented by the formula: H-(O-CH(CH3)CH2) n -OH (In the formula, n represents the average number of moles of propylene oxide added, and is, for example, 2 to 100. In order to enhance the bleaching power, n is preferably 3 or more, and more preferably 6 or more. In order to set the viscosity of the bleaching power enhancer low, n is preferably 70 or less, and more preferably 35 or less.) Examples of polypropylene glycol include compounds represented by the formula: Polypropylene glycol (3P.O.), polypropylene glycol (6P.O.), polypropylene glycol (7P.O.), polypropylene glycol (9P.O.), polypropylene glycol (12P.O.), polypropylene glycol (13P.O.), polypropylene glycol (15P.O.), polypropylene glycol (16P.O.), polypropylene glycol (17P.O.), polypropylene glycol (20P.O.), polypropylene glycol (26P.O.), polypropylene glycol (30P.O.), polypropylene glycol (33P.O.), polypropylene glycol (34P.O.), polypropylene glycol (51P.O.), polypropylene glycol (69P.O.), etc. Specific examples of polypropylene glycol include polypropylene glycol (3P.O.), polypropylene glycol (6P.O.), polypropylene glycol (69P.O.), etc. Here, PO means propylene oxide, and the number before PO indicates the average number of moles of propylene oxide added. The polypropylene glycol enhances the bleaching power on the hair, resulting in a higher bleaching power.

[0017] The method for enhancing the bleaching power of the present embodiment is a method for enhancing the bleaching power by adding polypropylene glycol to the hair treatment agent. Examples of hair treatment agents include oxidative hair dyes, hair bleaches, hair bleaching agents, and the like. The amount of polypropylene glycol used is, for example, from 2 to 40% by mass, and preferably from 5 to 35% by mass, from 10 to 30% by mass, or from 15 to 25% by mass, relative to the hair treatment agent at the time of use (or, in the case of a two-component type, the hair treatment agent being a mixture of the two components).

[0018] The formulation of the hair treatment agent when applied to hair during use may be, for example, a liquid, cream, wax, gel, or foam. The hair treatment agent does not have to be in a foam form, and a cream form makes it easy to apply to hair. Here, when the hair treatment agent is in a cream form, the viscosity of the hair treatment agent is, for example, 10,000 mPa s or more and 60,000 mPa s or less, measured 60 seconds later at 25°C and 12 rpm using a B-type viscometer.

[0019] 2. Oxidative hair dye The oxidative hair dye of this embodiment is an oxidative hair dye using a mixture of a first agent for oxidative hair dye, a second agent for oxidative hair dye, and a third agent for oxidative hair dye if present, in which the first agent for oxidative hair dye contains an oxidative dye and an alkali agent, the second agent for oxidative hair dye contains an oxidizing agent, and polypropylene glycol is contained in at least one of the first agent for oxidative hair dye, the second agent for oxidative hair dye, and the third agent for oxidative hair dye if present. The oxidative hair dye of this embodiment provides a higher bleaching power and achieves vivid hair dyeing.

[0020] Hereinafter, the first agent for the oxidative hair dye in the oxidative hair dye of this embodiment may be referred to as the "first agent", the second agent for the oxidative hair dye in the oxidative hair dye of this embodiment may be referred to as the "second agent", and the third agent for the oxidative hair dye in the oxidative hair dye of this embodiment may be referred to as the "third agent".

[0021] <First agent for oxidation hair dye> The first agent for the oxidation hair dye in the oxidation hair dye of the present embodiment contains an oxidation dye, an alkali agent, water, and, if necessary, polypropylene glycol. When polypropylene glycol is blended in the first agent, the blending amount is, for example, 4% by mass or more and 50% by mass or less, 10% by mass or more and 40% by mass or less, 15% by mass or more and 35% by mass or less, or 20% by mass or more and 30% by mass or less.

[0022] (Oxidation dyes) The oxidation dye blended in the first agent for oxidation hair dye means a dye intermediate and a coupler. The first agent for oxidation hair dye contains either a dye intermediate or a coupler or both as the oxidation dye. The blending amount of the oxidation dye in the first agent (the total blending amount of the dye intermediates and the total blending amount of the couplers) is, for example, 0.1% by mass or more and 9% by mass or less, or 0.1% by mass or more and 5% by mass or less.

[0023] (dye intermediates) The dye intermediate may be a dye intermediate that is generally used in the first agent for oxidation hair dyes. Specific examples of the dye intermediate include paramethylaminophenol or a salt thereof (e.g., sulfate, hydrochloride, etc.), paraphenylenediamine or a salt thereof (e.g., hydrochloride, sulfate, etc.), N-phenylparaphenylenediamine or a salt thereof (e.g., hydrochloride, acetate, etc.), orthochloroparaphenylenediamine or a salt thereof (e.g., sulfate, etc.), orthoaminophenol or a salt thereof (e.g., sulfate, hydrochloride, etc.), paraaminophenol or a salt thereof (e.g., sulfate, hydrochloride, etc.), toluene-2,5-diamine or a salt thereof (e.g., hydrochloride, sulfate, etc.), toluene-3,4-diamine or a salt thereof (e.g., Examples of the dye intermediate include, but are not limited to, 1-amino-4-methylaminoanthraquinone, 1,4-diaminoanthraquinone, 1-hydroxyethyl-4,5-diaminopyrazole or a salt thereof (e.g., sulfate, etc.), 2,2'-[(4-aminophenyl)imino]bisethanol or a salt thereof (e.g., sulfate, etc.), 2,4-diaminophenol or a salt thereof (e.g., hydrochloride, sulfate, etc.), 4,4'-diaminodiphenylamine or a salt thereof (e.g., sulfate, etc.), N,N'-bis(4-aminophenyl)-2,5-diamino-1,4-quinone diimine, etc. In addition, one or more of these dye intermediates can be used.

[0024] (coupler) The coupler may be a coupler that is generally used in the first agent for oxidation hair dyes. Specific examples of couplers include, but are not limited to, 2,6-diaminopyridine, resorcin, 2-methylresorcin, 2-chlororesorcin, 4-chlororesorcin, 5-aminoorthocresol or its salts (e.g., sulfate, etc.), metaaminophenol or its salts (e.g., sulfate, etc.), metaphenylenediamine or its salts (e.g., hydrochloride, etc.), 1,5-dihydroxynaphthalene, 2,4-diaminophenoxyethanol or its salts (e.g., hydrochloride, etc.), 3,3'-iminodiphenol, 5-(2-hydroxyethylamino)-2-methylphenol, α-naphthol, etc. Also, one or more of these couplers may be used.

[0025] (Alkaline agent) The first agent is a mixture of one or more alkaline agents. The alkaline agent promotes the action of the oxidizing agent contained in the oxidation hair dye, and improves the dyeability by swelling the hair and improving the penetration of the dye into the hair. Examples of alkaline agents include metal hydroxides such as sodium hydroxide and potassium hydroxide; metal carbonates such as sodium carbonate and potassium carbonate; metal phosphates such as sodium phosphate; ammonia; ammonium salts such as ammonium carbonate, ammonium hydrogen carbonate, and ammonium sulfate; alkanolamines such as monoethanolamine, triethanolamine, and isopropanolamine; and basic amino acids such as arginine. When an alkanolamine such as monoethanolamine, triethanolamine, or isopropanolamine is used as the alkaline agent, it does not have an irritating odor like ammonia, but tends to have a poorer bleaching power than other alkaline agents such as ammonia. However, by adding polypropylene glycol in this embodiment, the bleaching power is increased. The amount of the alkaline agent in the first agent is, for example, from 0.1% by mass to 8% by mass, from 1.0% by mass to 7% by mass, or from 1.5% by mass to 6% by mass.

[0026] (water) The amount of water in the first agent can be appropriately set, but is, for example, from 40% by mass to 95% by mass.

[0027] (optional ingredient) Various components can be optionally blended into the first agent. Optionally blended components include the same components as those optionally blended into known first agents for oxidation hair dyes. Optionally blended components include, for example, cationic surfactants, anionic surfactants, amphoteric surfactants, nonionic surfactants, higher alcohols, polyhydric alcohols, hydrocarbons, oils and fats, antioxidants, chelating agents, water, etc.

[0028] The first agent is preferably a blend of a nonionic surfactant, a higher alcohol, and water in order to form an emulsified formulation.

[0029] Examples of nonionic surfactants include polyoxyethylene alkyl ethers (polyoxyethylene cetyl ether, etc.), polyoxyethylene alkylene ethers (polyoxyethylene oleyl ether, etc.), polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene polyoxypropylene alkylene ethers, polyoxypropylene alkyl ethers, polyoxypropylene alkylene ethers, glycerin fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitol fatty acid esters, polyoxyethylene sorbitol fatty acid esters, polyethylene glycol derivatives of monoglycerides and diglycerides obtained from vegetable oils, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene hardened castor oil, etc., and one or more of these can be used. The blending concentration of the nonionic surfactant in the first agent can be appropriately set, and can be, for example, 0.1% by mass or more and 15% by mass or less.

[0030] Examples of higher alcohols include monohydric alcohols having 12 to 24 carbon atoms, specifically saturated or unsaturated linear higher alcohols (myristyl alcohol, cetanol, oleyl alcohol, cetostearyl alcohol, stearyl alcohol, behenyl alcohol, etc.), and branched higher alcohols (isocetyl alcohol, octyldodecanol, isostearyl alcohol, etc.), and one or more of these can be used. The blending concentration of the higher alcohol in the first agent can be appropriately set, and can be, for example, 2% by mass to 20% by mass.

[0031] (pH) The pH of the first agent is, for example, 9.5 or more, may be 9.5 to 11.0, or may be 9.6 to 11.0. The pH refers to a value measured at 25° C. using a known pH meter (the same applies to the pH below).

[0032] (Dosage form) The dosage form of the first agent may be, for example, liquid, cream, gel, powder, etc., and from the viewpoint of increasing the viscosity of the oxidation hair dye and making it easier to apply to hair, a cream form is preferred.

[0033] (viscosity) The viscosity of the first part is, for example, 30,000 mPa·s or more and 60,000 mPa·s or less after 60 seconds when measured at 25° C. and 12 rpm using a Brookfield viscometer.

[0034] (Manufacturing method) The first agent can be produced by a known method for producing a first agent for an oxidation hair dye depending on the components to be blended. One example of a method for producing the first agent is a method of mixing an oxidation dye, an alkali agent, water, and, if necessary, polypropylene glycol.

[0035] <Second agent for oxidation hair dye> The second agent for the oxidative hair dye in the oxidative hair dye of this embodiment is a blend of an oxidizing agent, water, and, if necessary, polypropylene glycol (the blended amount of water is, for example, 70 mass % or more). When polypropylene glycol is blended in the second agent, the blending amount is, for example, 4% by mass or more and 50% by mass or less, 10% by mass or more and 40% by mass or less, 15% by mass or more and 35% by mass or less, or 20% by mass or more and 30% by mass or less.

[0036] (Oxidizing agent) The oxidizing agent to be blended in the second agent for oxidative hair dyes may be any oxidizing agent commonly used in the second agent for oxidative hair dyes. Examples of the oxidizing agent include hydrogen peroxide, bromate, percarbonate, and perborate, and it is preferable to use hydrogen peroxide in order to dye hair more deeply. The blending amount of the oxidizing agent in the second agent is not particularly limited, but is, for example, 0.3% by mass or more and 7% by mass or less.

[0037] (optional ingredient) The second agent can further contain various optional components. The optional components include the same components as those optionally contained in known second agents, such as nonionic surfactants, cationic surfactants, anionic surfactants, amphoteric surfactants, higher alcohols, hydrocarbons, oils and fats, polyhydric alcohols, antioxidants, chelating agents, and pH adjusters.

[0038] In order to make the second agent into an emulsified formulation, it is preferable that a nonionic surfactant and a higher alcohol are blended. The nonionic surfactant and the higher alcohol used in the second agent can be the same as those used in the first agent, and can be blended in the same amounts.

[0039] Depending on the type of oxidizing agent to be blended, a pH adjuster may be added to the second agent for stabilization. For example, when hydrogen peroxide is used as the oxidizing agent, it can be stabilized by adding a pH adjuster such as an acid to make it weakly acidic (for example, pH 2 or more and less than 5).

[0040] The second agent may be in the form of, for example, liquid, cream, gel, powder, or the like.

[0041] (viscosity) The viscosity of the second part is, for example, 1000 mPa·s or more and 30000 mPa·s or less after 60 seconds when measured at 25° C. and 12 rpm using a Brookfield viscometer.

[0042] (Manufacturing method) The second agent can be produced by a known method for producing a second agent for an oxidation hair dye, depending on the components to be blended.

[0043] <Polypropylene glycol> In the oxidation hair dye of this embodiment, polypropylene glycol is blended in at least one of the first agent, the second agent, and, if present, the third agent. Polypropylene glycol may be blended in only one of the first agent, the second agent, and, if present, the third agent, or may be blended in two or more separate agents. As the polypropylene glycol, the polypropylene glycol used in the bleaching power enhancer of this embodiment can be used. The amount of polypropylene glycol to be blended is, for example, from 2% by mass to 40% by mass, and preferably from 5% by mass to 35% by mass, from 10% by mass to 30% by mass, or from 15% by mass to 25% by mass, based on the oxidative hair dye when used, comprising a mixture of the first agent, the second agent, and, if present, the third agent.

[0044] <Liquid paraffin> Liquid paraffin can be further blended in at least one of the first agent, the second agent, and the third agent if present. Liquid paraffin may be blended in only one of the first agent, the second agent, and the third agent if present, or may be blended in two or more separate agents. For example, it is preferable to blend liquid paraffin and polypropylene glycol in separate compositions, such as blending polypropylene glycol in the first agent and blending liquid paraffin in the second agent. By blending separately in this way, the emulsified state tends to be stable over time when the first agent, etc., is an oil-in-water emulsion composition. As the liquid paraffin, for example, a hydrocarbon compound that is colorless and non-volatile at room temperature and is used in cosmetics can be used.

[0045] The amount of liquid paraffin to be blended is, for example, from 2% by mass to 25% by mass, from 5% by mass to 20% by mass, or from 8% by mass to 15% by mass, based on the hair treatment product at the time of use, which is a mixture of the first agent, the second agent, and, if present, the third agent. By combining liquid paraffin and polypropylene glycol, even stronger bleaching power is achieved, resulting in vivid hair coloring.

[0046] <Oxidation hair dye> The oxidative hair dye of the present embodiment is used by mixing the first agent for oxidative hair dye, the second agent for oxidative hair dye, and, if present, the third agent for oxidative hair dye. The mixing may be performed in the same manner as the mixing method of the first agent, the second agent, and, if present, the third agent in known oxidative hair dyes.

[0047] (pH) The pH of the oxidative hair dye of the present embodiment is 9.3 or more from the viewpoint of improving bleaching power. Moreover, the pH is preferably 11.0 or less, more preferably 10.5 or less, from the viewpoint of suppressing irritation to the skin. The pH is a value measured at 25°C using a known pH meter.

[0048] The form of the oxidation hair dye of the present embodiment when used is not particularly limited, and examples thereof include liquid, cream, wax, gel, foam, etc. From the viewpoint of ease of application to hair, the cream form is preferable.

[0049] (Manufacturing method) The method for producing the oxidative hair dye of the present embodiment is not particularly limited, and may be, for example, a method in which the first and second agents are mixed before dyeing the hair. The mass ratio in this mixture is, for example, first agent:second agent=1:0.5 or more and 3 or less.

[0050] (How to use) The method of using the oxidative hair dye of the present embodiment is not particularly limited, and for example, a method of using a known oxidative hair dye can be used. One example of the method of use is a method in which an appropriate amount of the oxidative hair dye of the present embodiment is applied to hair, and the hair is dyed for a predetermined time (for example, 15 minutes or more and 30 minutes or less), and then the hair is washed and dried. The oxidative hair dye of the present embodiment provides higher bleaching power and achieves vivid hair dyeing. The hair that can be targeted in the method of using an oxidative hair dye includes various types of hair, such as chemically damaged hair (hair that has been dyed with an oxidative hair dye, hair that has been permed by straightening or shaping, etc.), hair that has been physically damaged by brushing, healthy hair, hard hair, and soft hair.

[0051] 3. Oxidation hair dye method The oxidation hair dyeing method of the present embodiment is the method described above in the method of using the oxidation hair dye agent.

[0052] 4. Oxidation hair dye kit The oxidative hair dye kit of this embodiment is an oxidative hair dye kit including a first agent for oxidative hair dye, a second agent for oxidative hair dye, and, if present, a third agent for oxidative hair dye, wherein the first agent for oxidative hair dye contains an oxidative dye, an alkaline agent, and water, the second agent for oxidative hair dye contains an oxidizing agent and water, and polypropylene glycol is contained in at least one of the first agent for oxidative hair dye, the second agent for oxidative hair dye, and, if present, the third agent for oxidative hair dye.

[0053] The first agent for oxidative hair dye, the second agent for oxidative hair dye, and the third agent for oxidative hair dye can be the first agent for oxidative hair dye, the second agent for oxidative hair dye, and the third agent for oxidative hair dye used in the oxidative hair dye of this embodiment. Using the kit of this embodiment, the first agent for oxidative hair dye, the second agent for oxidative hair dye, and the third agent for oxidative hair dye, if present, can be mixed and used as an oxidative hair dye.

[0054] 5. First agent for oxidation hair dyes The first agent for the oxidative hair dye of this embodiment is a first agent for the oxidative hair dye containing an oxidative dye, an alkaline agent, polypropylene glycol, and water. The first agent for the oxidative hair dye of this embodiment can be used as an oxidative hair dye by mixing with the second agent for the oxidative hair dye and, if present, the third agent for the oxidative hair dye.

[0055] 6. Hair bleach The hair bleach of the present embodiment is the same as the oxidation hair dye of the present embodiment described above except that the oxidation dye is excluded.

[0056] 7. Hair bleaching method The hair bleaching method of this embodiment is the same as the oxidation hair dyeing method of this embodiment except that the oxidation dye in the oxidation hair dye agent used in the oxidation hair dyeing method of this embodiment is excluded.

[0057] 8. Hair bleach kit The hair bleach kit of this embodiment is the same as the oxidation hair dye kit of the above embodiment except that the oxidation dye is excluded.

[0058] 9. Hair bleaching agent No. 1 The first agent for the hair bleach of this embodiment is the same as the first agent for the oxidation hair dye of this embodiment except that it does not contain the oxidation dye. EXAMPLES

[0059] The present invention will be described below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0060] Preparation of the first and second agents The ingredients shown in Table 1 were mixed in the amounts shown in the table in a conventional manner to prepare a first agent (cream-like). Furthermore, the ingredients shown in Table 2 were mixed in the amounts shown in the table in a conventional manner to prepare a second agent (cream-like).

[0061] [Table 1]

[0062] [Table 2]

[0063] Test Method The first and second agents were mixed in a mass ratio of 1:1 to prepare hair treatment agents (hair bleach, oxidative hair dye). 4 g of the hair treatment agent was applied to 1 g of a bundle of black human hair (manufactured by Beaulax Co., Ltd.) and left to stand for 30 minutes at 36° C. After treatment, the bundle of hair was washed and dried, and the lightness L was measured using a color difference meter (Spectrophotometric colorimeter CM-5, manufactured by Konica Minolta Co., Ltd.). * The lightness L of the untreated hair bundle was also measured. * was also measured. The brightness L of hair strands treated with each hair treatment * and the brightness of the untreated hair bundle L * The difference in brightness ΔL * was calculated.

[0064] Example 1 and Comparative Examples 1a to 1c For the hair bleaching agents listed in Table 3, the lightness difference ΔL calculated by the above test method * are listed in Table 3.

[0065] [Table 3]

[0066] Using Comparative Example 1a as a reference, Comparative Example 1b, which contains an increased amount of propylene glycol, and Comparative Example 1c, which contains additional polyethylene glycol, show a difference in lightness ΔL * On the other hand, Example 1, which contains polypropylene glycol, has a smaller lightness difference ΔL than Comparative Example 1a. * It can be seen that the blending of polypropylene glycol results in high brightness and enhanced bleaching power.

[0067] Examples 2a and 2b and Comparative Example 2 For the hair bleaching agents listed in Table 4, the lightness difference ΔL calculated by the above test method * are listed in Table 4.

[0068] [Table 4]

[0069] Compared to the hair bleach of Comparative Example 2, which does not contain polypropylene glycol, the hair bleaches of Examples 2a and 2b, which contain 10% by mass and 20% by mass of polypropylene glycol, show that the brightness increases and the bleaching power is strengthened as the amount of polypropylene glycol increases.

[0070] Examples 3a to 3e and Comparative Example 3 For the hair bleaching agents listed in Table 5, the lightness difference ΔL calculated by the above test method * are listed in Table 5.

[0071] [Table 5]

[0072] Compared to the hair bleach of Comparative Example 3, which does not contain polypropylene glycol, all of Examples 3a to 3e have a higher brightness, confirming the enhancement of bleaching power by polypropylene glycol. It is also clear that the enhancement of bleaching power can be adjusted according to the amount of polypropylene glycol.

[0073] Examples 4a to 4k For the hair bleaching agents listed in Table 6, the lightness difference ΔL calculated by the above test method * are listed in Table 6.

[0074] [Table 6]

[0075] Unlike Examples 3a to 3e, in Examples 4a, 4j, and 4k, polypropylene glycol is blended in the second agent, and in Examples 4b to 4i, polypropylene glycol is blended in both the first and second agents. In Examples 4a to 4e, it is apparent that the bleaching power enhancement can be adjusted according to the blending amount of polypropylene glycol, similarly to Examples 3a to 3e. In Examples 4g to 4i, unlike Examples 4a to 4f, polypropylene glycols having average added propylene oxide mole numbers of 17 and 7 were used in combination, and similar improvements in brightness and bleaching power were obtained.

[0076] Example 5 and Comparative Example 5 For the oxidation dyes listed in Table 7, the lightness difference ΔL calculated by the above test method * are listed in Table 6.

[0077] [Table 7]

[0078] In Example 5 and Comparative Example 5, oxidation hair dyes containing oxidation dyes (dye intermediates and couplers) were tested. The oxidative hair dye of Example 5, which contains polypropylene glycol, has higher brightness and stronger bleaching power than the oxidative hair dye of Comparative Example 5, which does not contain polypropylene glycol.

[0079] Examples 6a to 6b and Comparative Examples 6a to 6b For the hair bleaching agents listed in Table 8, the lightness difference ΔL calculated by the above test method * are listed in Table 8.

[0080] [Table 8]

[0081] In Examples 6a to 6b and Comparative Examples 6a to 6b, ammonia water, or ammonia water and ammonium hydrogen carbonate, was blended as the alkaline agent instead of monoethanolamine. The hair bleaches of Examples 6a to 6b containing polypropylene glycol have higher brightness and stronger bleaching power than the hair treatments of Comparative Examples 6a to 6b containing no polypropylene glycol.

[0082] Examples 7a to 7c and Comparative Example 7 For the hair bleaching agents listed in Table 9, the lightness difference ΔL calculated by the above test method * are listed in Table 9.

[0083] [Table 9]

[0084] Examples 7a and 7c contain liquid paraffin. The hair bleaches containing liquid paraffin in Examples 7a and 7c have high brightness and enhanced bleaching power, similar to the hair bleach without liquid paraffin in Example 7b. The only difference between Example 7b and Example 7c is the presence or absence of liquid paraffin. It can be seen that the addition of liquid paraffin results in higher brightness and stronger bleaching power.

[0085] The embodiments and examples disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, not the above description, and includes all modifications within the meaning and scope of the claims.

Claims

1. A bleaching power enhancer containing polypropylene glycol.

2. A method for enhancing bleaching power by adding polypropylene glycol to a hair treatment agent.

3. An oxidation hair dye comprising a mixture of a first agent for an oxidation hair dye, a second agent for an oxidation hair dye, and, if present, a third agent for an oxidation hair dye, The first agent for the oxidation hair dye contains an oxidation dye and an alkali agent, The second agent for the oxidation hair dye contains an oxidizing agent, The oxidation hair dye, wherein polypropylene glycol is blended in at least one of the first agent for the oxidation hair dye, the second agent for the oxidation hair dye, and, if present, the third agent for the oxidation hair dye.

4. The oxidative hair dye according to claim 3, further comprising liquid paraffin blended in at least one of the first agent for the oxidative hair dye, the second agent for the oxidative hair dye, and, if present, the third agent for the oxidative hair dye.

5. A hair dyeing method using the oxidative hair dye composition according to claim 3 or 4.

6. A kit for an oxidative hair dye comprising a first agent for an oxidative hair dye, a second agent for an oxidative hair dye, and, if present, a third agent for an oxidative hair dye, The first agent for the oxidation hair dye contains an oxidation dye and an alkali agent, The second agent for the oxidation hair dye contains an oxidizing agent, A kit for an oxidation hair dye, in which polypropylene glycol is blended in at least one of the first agent for the oxidation hair dye, the second agent for the oxidation hair dye, and, if present, the third agent for the oxidation hair dye.

7. The oxidation hair dye kit according to claim 6, further comprising liquid paraffin blended in at least one of the first agent for the oxidation hair dye, the second agent for the oxidation hair dye, and, if present, the third agent for the oxidation hair dye.

8. The first agent for oxidative hair dyes contains oxidative dyes, alkaline agents and polypropylene glycol.

9. A hair bleach comprising a first agent for the hair bleach, a second agent for the hair bleach, and, if present, a third agent for the hair bleach, The first agent for the hair bleach contains an alkaline agent, The second agent for the hair bleach contains an oxidizing agent, A hair bleach comprising polypropylene glycol in at least one of the first agent for the hair bleach, the second agent for the hair bleach, and, if present, the third agent for the hair bleach.

10. A kit for hair bleach comprising a first agent for the hair bleach, a second agent for the hair bleach, and, if present, a third agent for the hair bleach, The first agent for the hair bleach contains an alkaline agent, The second agent for the hair bleach contains an oxidizing agent, A kit for hair bleach, comprising polypropylene glycol blended in at least one of the first agent for the hair bleach, the second agent for the hair bleach, and, if present, the third agent for the hair bleach.

11. The first agent for hair bleaching contains an alkaline agent and polypropylene glycol.

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