Hair treatment method and hair treatment kit

Abstract

To provide a novel hair treatment method and hair treatment kit, capable of reducing damage to hair following hair dyeing or bleaching / decoloring with oxidative hair dyeing agents or bleaching / decoloring agents.SOLUTION: Provided are a hair treatment method comprising a hair dyeing or bleaching / decoloring step of performing hair dyeing or bleaching / decoloring with an oxidative hair dyeing agent or a bleaching / decoloring agent and a post-treatment step of treating with a post-treatment agent, and a hair treatment kit comprising an oxidative hair dyeing agent or a bleaching / decoloring agent and a post-treatment agent, wherein both the oxidative hair dyeing agent or bleaching / decoloring agent and the post-treatment agent contain one or more cationic compounds selected from the group consisting of cationic silicones, cationic polymers, and cationic surfactants; a ratio (Ct / Cd) of a cationic functional group amount (Ct) derived from the cationic compound in the post-treatment agent to a cationic functional group amount (Cd) derived from the cationic compound in the oxidative hair dyeing agent or bleaching / decoloring agent is 1 or more and 30 or less; a cyclic silicone concentration in the post-treatment agent is 1 wt.% or less; and after performing the hair dyeing or bleaching / decoloring with the oxidative hair dyeing agent or bleaching / decoloring agent, the post-treatment agent is applied to hair and dried without rinsing.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a hair treatment method and a hair treatment kit for treating hair after dyeing or bleaching / decoloring treatment with an oxidative hair dye or bleaching / decoloring agent. [Background technology]

[0002] Oxidative hair dyes and bleaching agents contain alkaline and oxidizing agents, which tend to damage hair after dyeing or bleaching. Damaged hair can have a negative impact on the feel of the hair. A common method for treating hair after dyeing or bleaching / decoloring is to apply a treatment agent containing a cationic surfactant or the like to the hair (Patent Documents 1 to 5, etc.). Patent Document 6 also proposes a hair treatment method in which hair is treated with a leave-in post-treatment agent after treatment with a hair bleach or oxidative hair dye, and a hair treatment kit for use in this treatment method. Cyclic silicones are used in hair dyes and various cosmetics as a component that imparts smoothness. However, in recent years, there has been a demand to reduce the amount of cyclic silicones used due to concerns about the environmental impact and safety of some cyclic silicone (cyclomethicone) compounds. For example, Patent Document 7 proposes a volatile oily composition that can replace cyclic silicones in cosmetic formulations. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-92824 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-114642 [Patent Document 3] Japanese Patent Application Laid-Open No. 2002-114643 [Patent Document 4] Japanese Patent Application Laid-Open No. 2010-285388 [Patent Document 5] Japanese Patent Application Publication No. 2020-138937 [Patent Document 6] Japanese Patent Application Laid-Open No. 2003-119116 [Patent Document 7] Japanese Patent Application Publication No. 2018-172422 Summary of the Invention [Problem to be solved by the invention]

[0004] The objective of the present invention is to provide a new hair treatment method and hair treatment kit that can prevent the cationic components in an oxidation hair dye or bleaching / decoloring agent from causing stickiness during rinsing, and further prevent the cationic components in a subsequent post-treatment agent from being adsorbed by the hair, resulting in a poor feel when finished, while also improving the feel between dyeing or bleaching / decoloring and applying the post-treatment agent. [Means for solving the problem]

[0005] The means for solving the problems of the present invention are as follows. 1. A hair dyeing or bleaching / decoloring process using an oxidative hair dye or bleaching / decoloring agent; Next, a post-treatment step of treating with a post-treatment agent; A hair treatment method comprising: Both the oxidative hair dye or bleaching / decoloring agent and the post-treatment agent contain one or more cationic compounds selected from the group consisting of cationic silicones, cationic polymers, and cationic surfactants, the ratio (Ct / Cd) of the amount of cationic functional groups (Ct) derived from the cationic compound in the post-treatment agent to the amount of cationic functional groups (Cd) derived from the cationic compound in the oxidative hair dye or bleach / decoloring agent is 1 or more and 30 or less, the concentration of the cyclic silicone in the post-treatment agent is 1% by weight or less, A hair treatment method characterized by applying the post-treatment agent to the hair after dyeing or bleaching / decoloring treatment with the oxidative hair dye or bleaching / decoloring agent, and then drying the hair without rinsing it off. 2. The hair treatment method according to 1., wherein Cd is 0.1 or less and Ct / Cd is 1.5 or more. 3. The hair treatment method according to 1. or 2., wherein the oxidative hair dye or bleaching / decolorizing agent contains a nonionic silicone compound. 4. The hair treatment method according to any one of 1. to 3., wherein the oxidative hair dye or bleaching / decoloring agent contains an alkaline agent in an amount of 0.1% by weight or more and 8% by weight or less. 5. The oxidative hair dye or bleach / decolorizing agent contains a cationic silicone or a cationic polymer, the post-treatment agent contains a polyhydric alcohol, The hair treatment method according to any one of 1. to 4., wherein the ratio of the amount of polyhydric alcohol in the post-treatment agent to the total amount of cationic silicone and cationic polymer in the oxidative hair dye or bleach / decolorizing agent (polyhydric alcohol / (cationic silicone + cationic polymer)) is 0.5 or more and 10 or less. 6. A hair treatment kit consisting of an oxidative hair dye or bleaching / decoloring agent and a post-treatment agent, Both the oxidative hair dye or bleaching / decoloring agent and the post-treatment agent contain one or more cationic compounds selected from the group consisting of cationic silicones, cationic polymers, and cationic surfactants, the ratio (Ct / Cd) of the amount of cationic functional groups (Ct) derived from the cationic compound in the post-treatment agent to the amount of cationic functional groups (Cd) derived from the cationic compound in the oxidative hair dye or bleach / decoloring agent is 1 or more and 30 or less, the concentration of the cyclic silicone in the post-treatment agent is 1% by weight or less, The hair treatment kit is characterized in that the post-treatment agent is applied to the hair after dyeing or bleaching / decoloring treatment with the oxidative hair dye or bleaching / decoloring agent, and is then dried without being rinsed off. [Effects of the Invention]

[0006] The present invention provides a hair treatment method and hair treatment kit that can reduce damage to hair after dyeing or bleaching / decoloring treatment with an oxidative hair dye or bleaching / decoloring agent and that provides a good feel between dyeing or bleaching / decoloring and application of a post-treatment agent.The present invention provides a hair treatment method and hair treatment kit that provides an excellent feel after dyeing or bleaching / decoloring while reducing the amount of cyclic silicone used. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hair treatment method The hair treatment method of the present invention comprises a hair dyeing or bleaching / decoloring step in which hair is dyed or bleached / decolored using an oxidative hair dye or bleaching / decoloring agent; Next, a post-treatment step of treating with a post-treatment agent; and Both the oxidative hair dye or bleaching / decoloring agent and the post-treatment agent contain one or more cationic compounds selected from the group consisting of cationic silicones, cationic polymers, and cationic surfactants; the ratio (Ct / Cd) of the amount of cationic functional groups (Cd) derived from the cationic compound in the oxidative hair dye or bleach / decolorizing agent to the amount of cationic functional groups (Ct) derived from the cationic compound in the post-treatment agent is 1 or more and 30 or less, the concentration of the cyclic silicone in the post-treatment agent is 1% by weight or less, This method is characterized by applying a post-treatment agent to the hair after dyeing or bleaching / decoloring treatment using an oxidative hair dye or bleaching / decoloring agent, and then drying the hair without rinsing it off. Hereinafter, the oxidative hair dye or bleaching / decoloring agent of the present invention and the post-treatment agent will be collectively referred to as the treatment agent. In addition, in this specification, the expression "A to B" (A and B are numerical values) means a numerical range that includes both ends.

[0008] Any known oxidative hair dye or bleaching / decolorizing agent can be used without any particular limitation. The formulation of the oxidation hair dye or bleaching / decoloring agent is not particularly limited, and examples of formulations at 25°C include liquids such as aqueous solutions and emulsions, gels, foams, creams, solids, aerosols, and non-aerosols. In the case of non-aerosols, various forms such as squeeze foamers and pump foamers can be used. In the case of aerosols, known propellants and foaming agents can be used. In the case of solid formulations, a dispersant may be blended.

[0009] When using an oxidation hair dye or bleach / decolorizing agent that has a first agent containing at least an alkaline agent and a dye, and a second agent containing at least an oxidizing agent, which are mixed and prepared at the time of use, the viscosity of the first agent is not particularly limited, but is preferably 10 to 100,000 mPa·s.The viscosity of the second agent is also not particularly limited, but is preferably 10 to 100,000 mPa·s. The viscosity of the oxidative hair dye or bleach / decoloring agent after mixing the first and second agents is not particularly limited, but is, for example, 1,000 to 100,000 mPa·s. From the viewpoint of preventing dripping, the lower limit of the viscosity of the oxidative hair dye or bleach / decoloring agent after mixing is preferably 1,500 mPa·s or more, more preferably 2,000 mPa·s or more, and even more preferably 3,000 mPa·s or more. From the viewpoint of ease of application to hair, the upper limit of the viscosity of the oxidative hair dye or bleach / decoloring agent after mixing is preferably 50,000 mPa·s or less, more preferably 40,000 mPa·s or less, and even more preferably 30,000 mPa·s or less. The viscosity of the oxidative hair dye or bleach / decoloring agent can be adjusted by adding a thickener such as a surfactant or a water-soluble polymer. In this specification, viscosity can be measured using a B-type viscometer such as a TVB-10 type viscometer at 25°C for 1 minute using a rotor suitable for each viscosity.

[0010] The post-treatment agent is a so-called leave-in type treatment, which is applied to hair after dyeing with an oxidative hair dye and rinsing off the oxidative hair dye, and then dried without rinsing. The viscosity of the post-treatment agent is not particularly limited, but is, for example, 1,000 to 200,000 mPa·s. A viscosity of 1,000 mPa·s or higher allows the post-treatment agent to be applied evenly to dyed hair. The viscosity of the post-treatment agent is preferably 1,500 mPa·s or higher, more preferably 2,000 mPa·s or higher, and is preferably 100,000 mPa·s or lower, more preferably 50,000 mPa·s or lower.

[0011] The pH of the post-treatment agent is preferably 2.0 to 6.9 in a 10 wt % aqueous solution. Because oxidative hair dyes contain an alkaline agent, residual alkali remains in dyed hair. Even if a post-treatment agent containing a cationic compound is applied to hair containing this residual alkali, the residual alkali may prevent the cationic compound from fully adhering to the hair. By setting the pH of the post-treatment agent to 2.0 to 6.9, the residual alkali in the hair can be neutralized, further improving the fixation of the cationic compound to the hair. Considering the impact on hair, a pH of 3.5 or higher is more preferable, 4.5 or higher is even more preferable, and 6.7 or lower is more preferable, with 6.5 or lower being even more preferable, in order to more mildly neutralize the residual alkali.

[0012] Hereinafter, an oxidation hair dye composition will be described as an example, which comprises a first agent containing at least an alkaline agent and a dye, and a second agent containing at least an oxidizing agent, and which is mixed and prepared before use. Note that the oxidation hair dye composition or bleaching / decoloring composition of the present invention is not limited to a two-component type, and may be a three-component or more type. The first agent of the oxidation hair dye contains at least an alkaline agent and a dye. The alkaline agent is added to promote the action of the oxidizing agent contained in the second agent. Specific examples of alkaline agents include ammonia, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, sodium hydroxide, potassium hydroxide, ammonium carbonate, sodium carbonate, arginine, guanidine, and the like, and these may be used alone or in combination of two or more.

[0013] Specific examples of dyes include oxidation dyes consisting of a key intermediate and a coupler. As the main intermediate, one or more selected from p-phenylenediamine, toluene-2,5-diamine, N-phenyl-p-phenylenediamine, 4,4'-diaminodiphenylamine, p-aminophenol, o-aminophenol, p-methylaminophenol, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, 2-hydroxyethyl-p-phenylenediamine, o-chloro-p-phenylenediamine, 4-amino-m-cresol, 2-amino-4-hydroxyethylaminoanisole, 2,4-diaminophenol, and salts thereof are used.

[0014] As the coupler, one or more types selected from resorcinol, catechol, pyrogallol, phloroglucinol, gallic acid, hydroquinone, 5-amino-o-cresol, m-aminophenol, 5-(2-hydroxyethylamino)-2-methylphenol, m-phenylenediamine, 2,4-diaminophenoxyethanol, toluene-3,4-diamine, α-naphthol, 2,6-diaminopyridine, diphenylamine, 2-methylresorcinol, N,N-diethyl-m-aminophenol, phenylmethylpyrazolone, 3,3'-iminodiphenol, 1,5-dihydroxynaphthalene, tannic acid, and salts thereof can be used.

[0015] The second agent of the oxidation hair dye contains at least an oxidizing agent. Specific examples of the oxidizing agent include hydrogen peroxide, percarbonate, perborate, persulfate, sodium peroxide, potassium peroxide, magnesium peroxide, barium peroxide, calcium peroxide, strontium peroxide, hydrogen peroxide adduct of sulfate, hydrogen peroxide adduct of phosphate, hydrogen peroxide adduct of pyrophosphate, urea peroxide, melamine peroxide, etc., and these can be used alone or in combination of two or more. Of these, hydrogen peroxide is preferred. The amount of oxidizing agent contained in the second agent is preferably 0.1 to 15.0% by weight of the total amount of the second agent, more preferably 2.0% by weight or more, even more preferably 3.0% by weight or more, and more preferably 9.0% by weight or less, even more preferably 6.0% by weight or less. When the content is 0.1% by weight or more, melanin can be sufficiently bleached, and when it is 15.0% by weight or less, there is no risk of problems such as damage to the hair.

[0016] In the present invention, both the oxidative hair dye or bleaching / decoloring agent and the post-treatment agent contain one or more cationic compounds selected from the group consisting of cationic silicones, cationic polymers, and cationic surfactants. When the oxidative hair dye is a two-component system, either the first or second component, or both, may contain a cationic compound.

[0017] Cationic silicones include amino-modified silicones, such as aminopropylmethylsiloxane-dimethylsiloxane copolymer (aminopropyl dimethicone), aminoethylaminopropylsiloxane-dimethylsiloxane copolymer (amodimethicone), and aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer (trimethylsilyl amodimethicone), with aminopropylmethylsiloxane-dimethylsiloxane copolymer (aminopropyl dimethicone) being preferred. Examples of cationic polymers include cationized cellulose derivatives, cationized guar gum, cationized starch, cationized pullulan, quaternized polyvinylpyrrolidone derivatives, and diallyl quaternary ammonium salt polymer derivatives, with cationized cellulose derivatives being preferred.

[0018] Examples of cationic surfactants include lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, distearyldimethylammonium chloride, behenyltrimethylammonium methylsulfate, tri(polyoxyethylene)stearylammonium chloride (5E.O.), Quaternium-91 (INCI name), behenyltrimethylammonium chloride, cetyltrimethylammonium bromide, stearyltrimethylammonium bromide, stearyltrimethylammonium saccharin, cetyltrimethylammonium saccharin, N,N-di(acyloxy),N-(hydroxyethyl),N-methylammonium methosulfate, and acid-neutralized tertiary amidoamines, with stearyltrimethylammonium chloride and behenyltrimethylammonium chloride being preferred.

[0019] In the present invention, the ratio (Ct / Cd) of the amount of cationic functional groups (Cd) derived from cationic compounds in the oxidative hair dye or bleaching / decoloring agent to the amount of cationic functional groups (Ct) derived from said cationic compounds in the post-treatment agent is from 1 to 30. The amount of cationic functional groups refers to the weight ratio of cationic functional groups to the total weight of the oxidative hair dye or bleaching / decoloring agent or post-treatment agent, and can be calculated by multiplying the molecular weight of the cationic functional groups per mole of cationic compound by the weight ratio of the cationic compound for each cationic compound contained in each agent. Specifically, it can be expressed by the following formula: Amount of cationic functional group = M1 × m1 + M2 × m2 + + M n ×m n M: Cationic silicone Amino group equivalent / number average molecular weight of cationic silicone In the case of cationic polymers Molecular weight of cationic functional group in repeating unit / molecular weight of repeating unit (If there are multiple repeating units, calculate the value for each repeating unit using the formula given, multiply it by the weight ratio of each repeating unit to the entire polymer, and sum the results.) In the case of cationic surfactants Molecular weight of cationic functional group / molecular weight of cationic surfactant m: Weight ratio of cationic compound to the total oxidative hair dye, bleaching / decoloring agent, or post-treatment agent The subscripts are the symbols assigned to each of the n cationic compounds.

[0020] In the present invention, when this ratio (Ct / Cd) is 1 or more, the amount of cationic compound in the post-treatment agent adheres to the hair in sufficient quantity, resulting in a smooth, non-squeaky finish to the hair, or the amount of cations in the oxidative hair dye or bleach / decolorizing agent is not excessive, allowing the effects of the cations in the post-treatment agent to be obtained, resulting in a good feel to the hair when finished. Furthermore, when this ratio (Ct / Cd) is 30 or less, the conditioning effect is not excessive, and the hair does not feel sticky or greasy. This ratio (Ct / Cd) is preferably 1.5 or more, more preferably 2 or more, and is preferably 25 or less, more preferably 20 or less, further preferably 15 or less, even more preferably 10 or less, and further more preferably 5 or less.

[0021] The amount of cationic functional groups Cd derived from cationic compounds in the oxidative hair dye or bleach / decoloring agent is preferably 0.1 or less. When Cd is 0.1 or less, less cationic compound adheres to the hair during the dyeing or bleach / decoloring process, and the cationic compound in the post-treatment agent can be efficiently adhered to the hair in the post-treatment process, resulting in a good final finish. Cd is more preferably 0.09 or less, and even more preferably 0.08 or less. There is no particular lower limit for Cd, but it is 0.01.

[0022] The amount of cationic functional groups Ct derived from the cationic compound in the post-treatment agent is preferably 0.01 or more and 0.65 or less. When Ct is 0.01 or more, a conditioning effect on the finish is obtained, and when Ct is 0.65 or less, the conditioning effect is not excessive, and no slimy or sticky feeling remains. Ct is more preferably 0.04 or more, even more preferably 0.08 or more, and even more preferably 0.12 or more, and is more preferably 0.65 or less, even more preferably 0.45 or less, and even more preferably 0.25 or less.

[0023] The oxidation hair dye or bleach / decolorizing agent preferably contains 0.1% by weight or more and 8% by weight or less of an alkaline agent. Examples of the alkaline agent include ammonia and alkanolamines, such as monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, N-dimethylethanolamine, 2-amino-2-methyl-1-propanol, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, 3-amino-1,2-propanediol, 3-dimethylamino-1,2-propanediol, and tris(hydroxymethylamino)methane. The content of the alkaline agent in the oxidative hair dye or bleach / decolorizing agent is more preferably 7% by weight or less, even more preferably 6% by weight or less, even more preferably 5% by weight or less, and even more preferably 4% by weight or less. The lower limit of the content of the alkaline agent in the oxidative hair dye or bleach / decolorizing agent is more preferably 0.15% by weight or more, and even more preferably 0.2% by weight or more. By satisfying the above-mentioned Ct / Cd ratio, the hair treatment method of the present invention can suppress damage to hair even when using an oxidative hair dye or bleach / decolorizing agent containing an alkaline agent in an amount of 0.1% by weight or more and 8% by weight or less.

[0024] The treatment agents of the present invention (oxidative hair dye or bleaching / decoloring agent and post-treatment agent) preferably contain silicones to improve the feel of hair. In the case of two-component oxidative hair dye or bleaching / decoloring agents, silicones can be blended into either the first or second agent, or both. However, in the present invention, the concentration of cyclic silicone in the post-treatment agent is 1% by weight or less. The concentration of cyclic silicone in the post-treatment agent is preferably 0.5% by weight or less, more preferably 0.3% by weight or less, even more preferably 0.1% by weight or less, and can even be 0% by weight. Examples of silicones include amino-modified silicones, which are cationic silicones, as well as volatile linear silicones, methylpolysiloxanes (dimethicones), methylphenylpolysiloxanes, hydroxy-terminated methylpolysiloxanes (dimethiconols), polyether-modified silicones, betaine-modified silicones, alkyl-modified silicones, alkoxy-modified silicones, and cyclic silicones, and these can be blended alone or in combination of two or more. Among these, nonionic silicone compounds are preferred from the viewpoint of suppressing hair damage, and methylpolysiloxanes (dimethicones) and hydroxy-terminated methylpolysiloxanes (dimethiconols) are more preferred.

[0025] The oxidative hair dye or bleach / decoloring agent of the present invention, or in the case of a two-component oxidative hair dye or bleach / decoloring agent, can contain other optional ingredients in both the first and second components. These optional ingredients include direct dyes, anionic surfactants, nonionic surfactants, anionic polymers, nonionic polymers, oils and fats, higher alcohols, waxes, fatty acid esters, hydrocarbons, higher fatty acids, sugars, humectants, polypeptides, solvents, viscosity adjusters, pH adjusters, pH buffers, preservatives, chelating agents, antioxidants, stabilizers, and propellants, as well as plant extracts, herbal extracts, vitamins, excipients, colorings, fragrances, pigments, UV absorbers, and those listed in the "Standards for Quasi-drug Raw Materials" (published June 1991 by Yakuji Nipposha). These optional ingredients can be contained in either the first or second agent, or in both.

[0026] The post-treatment agent of the present invention preferably contains a polyhydric alcohol. The ratio of the amount of polyhydric alcohol in the post-treatment agent to the total amount of cationic silicone and cationic polymer in the oxidative hair dye or bleaching / decoloring agent (polyhydric alcohol / (cationic silicone + cationic polymer)) is preferably 0.5 or more and 10 or less. Hair tends to dry out after dyeing, but by ensuring that the ratio of the amount of polyhydric alcohol in the post-treatment agent to the total amount of cationic silicone and cationic polymer in the oxidative hair dye or bleaching / decoloring agent is within the above-mentioned range, hair moisture retention is improved, and excess cationic polymer and other substances in the oxidative hair dye are easily removed from the hair, reducing stickiness and stickiness. The ratio of the amount of polyhydric alcohol in the post-treatment agent to the total amount of cationic silicone and cationic polymer in the oxidative hair dye or bleaching / decoloring agent is preferably 0.6 or more, more preferably 0.7 or more, more preferably 8 or less, even more preferably 6 or less, and even more preferably 4 or less. Examples of polyhydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, highly polymerized polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, isoprene glycol, 1,3-butylene glycol, glycerin, diglycerin, polyglycerin, etc., and these can be used alone or in combination of two or more. Among these, propylene glycol and glycerin are preferred. From the viewpoint of formulation stabilization, the amount of polyhydric alcohol added is preferably 0.5% by weight or more, more preferably 1% by weight or more, and even more preferably 2% by weight or more, relative to the total amount of the post-treatment agent, and is preferably 30% by weight or less, more preferably 20% by weight or less, and even more preferably 10% by weight or less.

[0027] The post-treatment agent of the present invention may contain other optional components, such as anionic surfactants, nonionic surfactants, anionic polymers, nonionic polymers, oils and fats, higher alcohols, waxes, fatty acid esters, hydrocarbons, higher fatty acids, sugars, silicone derivatives, moisturizers, antistatic agents, hair softeners, polypeptides, solvents, viscosity adjusters, pH adjusters, pH buffers, preservatives, chelating agents, antioxidants, and stabilizers, as well as plant extracts, herbal extracts, vitamins, excipients, fragrances, dyes, coloring materials, pigments, ultraviolet absorbers, and those listed in the "Standards for Quasi-Drug Raw Materials" (published in June 1991 by Yakuji Nipposha).

[0028] The hair treatment method of the present invention begins with a hair dyeing step in which an oxidative hair dye or bleaching agent is applied to hair to dye it, or a bleaching step in which an oxidative hair dye or bleaching agent is applied to hair to bleach it. When using an oxidative hair dye or bleaching agent that contains a first agent containing at least an alkaline agent and a dye, and a second agent containing at least an oxidizing agent, which is mixed and prepared before use, the first and second agents are mixed in a predetermined weight ratio, for example, 1:5 to 2:1, and then applied to the hair. After leaving the mixture to stand for a predetermined time to dye or bleach, the oxidative hair dye or bleaching agent is rinsed off with shampoo, and a rinse, conditioner, etc. are used as needed. Next, a post-treatment step is performed in which a post-treatment agent is applied to damp hair after towel drying, and the hair is left to dry without rinsing, using a hair dryer or air-drying, etc.

[0029] Here, after dyeing or bleaching / decoloring, hair is in a swollen state due to the alkaline agent contained in the oxidative hair dye or bleach / decoloring agent. In order to thoroughly penetrate and fix the cationic compound contained in the post-treatment agent deep into the hair, it is preferable to apply the post-treatment agent to wet hair. Furthermore, the reason for not rinsing the post-treatment agent after application is to neutralize any residual alkali in the hair and because a certain amount of time is required for the cationic compound contained in the post-treatment agent to fully fixate within the hair. Specifically, it is preferable not to wash the hair for at least 3 hours after applying the post-treatment agent, more preferably at least 6 hours, and even more preferably at least 12 hours.

[0030] Hair treatment kit The hair treatment kit of the present invention is a hair treatment kit comprising an oxidative hair dye or a bleaching / decoloring agent and a post-treatment agent, Both the oxidative hair dye or bleaching / decoloring agent and the post-treatment agent contain one or more cationic compounds selected from the group consisting of cationic silicones, cationic polymers, and cationic surfactants; the ratio (Ct / Cd) of the amount of cationic functional groups (Ct) derived from the cationic compound in the post-treatment agent to the amount of cationic functional groups (Cd) derived from the cationic compound in the oxidative hair dye or bleach / decolorizing agent is 1 or more and 30 or less; the concentration of the cyclic silicone in the post-treatment agent is 1% by weight or less, The post-treatment agent is characterized in that it is applied to hair after dyeing or bleaching / decoloring treatment with the oxidative hair dye or bleaching / decoloring agent, and is then dried without being rinsed off.

[0031] In the hair treatment kit of the present invention, the oxidative hair dye or bleaching / decoloring agent and post-treatment agent described in the hair treatment method above can be used. The hair treatment kit of the present invention can be suitably used in the hair treatment method of the present invention. [Example]

[0032] The above embodiment will be specifically described below with reference to examples and comparative examples. First and second agents of oxidation hair dyes were prepared with the compositions shown in Tables 1 to 4. Post-treatment agents with the compositions shown in Tables 5 to 8 were prepared. The first and second agents of the oxidation hair dye were mixed in a weight ratio of 1:2, and the mixture was applied to the hair and left at room temperature (25°C) for 20 minutes to perform the hair dyeing process. After rinsing with water, the oxidation hair dye attached to the hair was rinsed off with shampoo (Hoyu Co., Bigen Treatment Shampoo), and then rinsed with conditioner (Hoyu Co., Bigen Treatment Rinse), followed by towel drying. While the hair was still damp after towel drying, a post-treatment agent (leave-in treatment) was applied and then the hair was left to dry.

[0033] The evaluation was based on the following criteria at the time of rinsing (when rinsing the oxidative hair dye with water), at the end of shampooing (when the hair is wet after shampooing), when applying conditioner (when the hair is wet after rinsing), and at the time of finishing (when the hair is dry after applying a post-treatment product). Ten trained expert panelists rated the ease of running their fingers through the hair on a five-point scale: excellent (5 points), good (4 points), fair (3 points), somewhat poor (2 points), and poor (1 point), and the average score of each panelist was calculated. The evaluation results were as follows: 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". The results are shown in Tables 9 and 10.

[0034] [Table 1]

[0035] [Table 2]

[0036] [Table 3]

[0037] [Table 4]

[0038] [Table 5]

[0039] [Table 6]

[0040] [Table 7]

[0041] [Table 8]

[0042] [Table 9]

[0043] [Table 10]

[0044] From Examples 1 to 29 and Comparative Example 1, it was confirmed that when the Ct / Cd value is 1 or more, the feel when applying the rinse and when finished is improved. Examples 21 to 23 are tests in which the amount of polyhydric alcohol in the post-treatment agent was changed. Examples 1 and 21 to 23 show that by setting the ratio of the amount of polyhydric alcohol in the post-treatment agent to the total amount of cationic silicone and cationic polymer in the oxidation hair dye (polyhydric alcohol / (cationic silicone + cationic polymer)) to be 0.5 or more and 10 or less, moisturizing properties were improved and sliminess and stickiness were suppressed. Examples 24 to 26 are tests in which the formulation of nonionic silicone was changed. Examples 1, 24, and 25 confirmed that the inclusion of nonionic silicone in an oxidative hair dye improves the feel when rinsing with water after dyeing and at the end of shampooing, and that the presence or absence of cyclic silicone makes little difference to the feel. Example 26, which does not contain nonionic silicone, had an inferior feel until the end of shampooing, but the feel improved from the time of application of the rinse, and the finish was good. The concentration of the alkaline agent was varied in Examples 27 to 29. From Examples 1 and 27 to 29, it was confirmed that when Ct / Cd was within the range of the present invention, the finished feel was excellent even when the concentration of the alkaline agent was increased.

Claims

1. A hair dyeing or bleaching / decoloring process using an oxidative hair dye or bleaching / decoloring agent; Next, a post-treatment step of treating with a post-treatment agent; A hair treatment method comprising: Both the oxidative hair dye or bleaching / decoloring agent and the post-treatment agent contain one or more cationic compounds selected from the group consisting of cationic silicones, cationic polymers, and cationic surfactants, a ratio (Ct / Cd) of the amount of cationic functional groups (Ct) derived from the cationic compound in the post-treatment agent to the amount of cationic functional groups (Cd) derived from the cationic compound in the oxidative hair dye agent or bleaching / decoloring agent is 1 or more and 30 or less, the concentration of the cyclic silicone in the post-treatment agent is 1 wt% or less, A hair treatment method characterized by applying the post-treatment agent to the hair after dyeing or bleaching / decoloring treatment with the oxidative hair dye or bleaching / decoloring agent, and then drying the hair without rinsing it off.

2. 2. The hair treatment method according to claim 1, wherein Cd is 0.1 or less and Ct / Cd is 1.5 or more.

3. 3. The hair treatment method according to claim 1, wherein the oxidative hair dye or bleaching / decoloring agent contains a nonionic silicone compound.

4. 3. The hair treatment method according to claim 1, wherein the oxidative hair dye or bleaching / decoloring agent contains an alkaline agent in an amount of 0.1% by weight or more and 8% by weight or less.

5. the oxidative hair dye or bleaching / decoloring agent contains a cationic silicone or a cationic polymer, the post-treatment agent contains a polyhydric alcohol, 3. The hair treatment method according to claim 1, wherein the ratio of the amount of polyhydric alcohol in the post-treatment agent to the total amount of cationic silicone and cationic polymer in the oxidative hair dye or bleaching / decoloring agent (polyhydric alcohol / (cationic silicone+cationic polymer)) is 0.5 or more and 10 or less.

6. A hair treatment kit comprising an oxidation hair dye or a bleaching / decoloring agent and a post-treatment agent, Both the oxidative hair dye or bleaching / decoloring agent and the post-treatment agent contain one or more cationic compounds selected from the group consisting of cationic silicones, cationic polymers, and cationic surfactants, a ratio (Ct / Cd) of the amount of cationic functional groups (Ct) derived from the cationic compound in the post-treatment agent to the amount of cationic functional groups (Cd) derived from the cationic compound in the oxidative hair dye agent or bleaching / decoloring agent is 1 or more and 30 or less, the concentration of the cyclic silicone in the post-treatment agent is 1 wt% or less, This hair treatment kit is characterized in that the post-treatment agent is applied to hair after dyeing or bleaching / decoloring treatment with the oxidative hair dye or bleaching / decoloring agent, and then dried without rinsing.

Images