Hair treatment composition and method for using the same

Abstract

To provide a technology that enables control of fading in hair treated with a hair cosmetic composition containing a direct dye.SOLUTION: A hair treatment composition comprises: a first hair cosmetic composition including a first surfactant and a direct dye; and a second hair cosmetic composition including a second surfactant and being free of a direct dye, the first surfactant comprising at least two types of ionic surfactants with different polarities, and the second surfactant comprising at least two types of ionic surfactants with different polarities.SELECTED DRAWING: None

Description

[Technical Field]

[0001] This specification relates to hair treatment compositions including a composition containing a surfactant and a direct dye, and a composition containing a surfactant but not a direct dye, and methods of using the same. [Background technology]

[0002] Patent Document 1 discloses a hair dye composition containing a direct dye and used for dyeing hair. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-123565 Summary of the Invention [Problem to be solved by the invention]

[0004] Direct dyes adhere to hair through ionic bonds, which are relatively weak bonds, and are therefore unlikely to penetrate deep into the hair. Furthermore, direct dyes do not undergo polymerization reactions like oxidative dyes, and therefore adhere to hair in relatively small molecular forms. Therefore, even if hair is dyed with a composition containing a direct dye, there is a problem in that fading easily progresses during daily activities such as washing. This specification provides a technology that can regulate fading of hair to which a hair cosmetic composition containing a direct dye is applied. [Means for solving the problem]

[0005] A first aspect disclosed by the present specification is a hair treatment composition comprising a first hair cosmetic composition containing a first surfactant and a direct dye, and a second hair cosmetic composition containing a second surfactant but no direct dye. The first surfactant contains at least two ionic surfactants having different polarities, and the second surfactant contains at least two ionic surfactants having different polarities. In this hair treatment composition, the first hair cosmetic composition contains a direct dye, but the second hair cosmetic composition does not contain a direct dye. Meanwhile, both the first hair cosmetic composition and the second hair cosmetic composition contain a surfactant. The first surfactant and the second surfactant each contain at least two ionic surfactants having different polarities. As a result, both the first composition and the second composition have a specific effect on hair (e.g., a hair cleansing effect) due to the surfactant. Therefore, the presence of these surfactants, for example, adjusts the cleansing power of the first hair cosmetic composition and the second hair cosmetic composition on hair, thereby achieving a good balance between the replenishment of pigment to hair by the first hair cosmetic composition and the removal of pigment from hair by the second hair cosmetic composition. As used herein, "at least two ionic surfactants having different polarities" refers to at least two surfactants selected from anionic surfactants that assume a negative charge when dissolved in water, cationic surfactants that assume a positive charge, and amphoteric surfactants that assume either a positive or negative charge. In other words, as used herein, anionic, cationic, and amphoteric surfactants have different polarities.

[0006] In a second aspect disclosed by the present specification, in the first aspect described above, the ratio of the content of the first surfactant in the first hair cosmetic composition to the content of the second surfactant in the second hair cosmetic composition may be 0.1 or more and 2 or less. This configuration makes it easier to control hair fading.

[0007] In a third aspect disclosed by the present specification, in the first or second aspect, the first surfactant may include a first amphoteric surfactant and a first anionic surfactant, and the second surfactant may include a second amphoteric surfactant and a second anionic surfactant. This configuration provides sufficient hair dyeing power and effectively suppresses fading.

[0008] In a fourth aspect disclosed by the present specification, in the third aspect described above, when the ratio of the content of the first anionic surfactant to the content of the first amphoteric surfactant in the first hair cosmetic composition is defined as a first value, and the ratio of the content of the second anionic surfactant to the content of the second amphoteric surfactant in the second hair cosmetic composition is defined as a second value, the ratio of the first value to the second value may be 0.1 or more and 2 or less. This configuration makes it easier to adjust hair fading.

[0009] In a fifth aspect disclosed by the present specification, in any one of the first to fourth aspects, the direct dye of the first hair cosmetic composition may comprise a basic dye. With this configuration, when the first hair cosmetic composition is applied to hair, the effects of improving spreadability upon application to hair and suppressing dripping from hair can be obtained.

[0010] In a sixth aspect disclosed by the present specification, in any one of the first to fifth aspects, the hair treatment composition may be applied to hair after a hair dye composition has been applied. Even hair dyed with a hair dye composition gradually fades with daily life. According to this configuration, the first hair cosmetic composition can replenish dye in hair dyed with the hair dye composition, thereby maintaining the hair color and providing a color change that suits the user's preferences.

[0011] In a seventh aspect disclosed by the present specification, in the sixth aspect, the hair dye composition may contain an oxidation dye.

[0012] In an eighth aspect disclosed by the present specification, in any one of the first to seventh aspects, the first hair cosmetic composition may be substantially free of silicone.

[0013] In a ninth aspect disclosed by the present specification, in any one of the first to eighth aspects, the hair treatment composition may be a hair wash composition for washing hair.

[0014] A tenth aspect disclosed by the present specification is a method for using a hair treatment composition. The method comprises a first step of applying to hair a first hair cosmetic composition containing a first surfactant and a direct dye, and a second step of applying to the hair a second hair cosmetic composition containing a second surfactant but no direct dye. The first surfactant comprises at least two ionic surfactants having different polarities, and the second surfactant comprises at least two ionic surfactants having different polarities. The first step and the second step are repeatedly performed on the hair. DETAILED DESCRIPTION OF THE INVENTION

[0015] One embodiment of the hair treatment composition disclosed in this specification is described below. The hair treatment composition comprises a first hair cosmetic composition containing a first surfactant and a direct dye, and a second hair cosmetic composition containing a second surfactant but no direct dye. The first surfactant contains at least two ionic surfactants having different polarities. The second surfactant contains at least two ionic surfactants having different polarities. The first and second hair cosmetic compositions of this embodiment are described below.

[0016] [First hair cosmetic composition] The first hair cosmetic composition (hereinafter simply referred to as the "first composition") contains a direct dye and a first surfactant.

[0017] [Direct dye] Direct dyes are colored compounds that are formulated to color hair by adhering to or penetrating the hair. Examples of direct dyes include basic dyes, acid dyes, natural dyes, nitro dyes, HC dyes, and disperse dyes.

[0018] Examples of basic dyes include Basic Blue 3, Basic Blue 6, Basic Blue 7, Basic Blue 41, Basic Blue 75, Basic Blue 99, Basic Blue 124, Basic Brown 4, Basic Brown 16, Basic Green 1, Basic Green 4, Basic Orange 1, Basic Orange 2, Basic Red 1, Basic Red 2, Basic Red 22, Basic Red 51, Basic Red 76, Basic Violet 1, Basic Violet 2, Basic Violet 4, Basic Violet 10, Basic Violet 14, Basic Yellow 11, Basic Yellow 28, Basic Yellow 87, and Basic Brown 16. Among these, Basic Blue 75 (basic blue 75), Basic Blue 124 (basic blue 124), Basic Violet 2 (basic purple 2), Basic Yellow 87 (basic yellow 87), Basic Red 51 (basic red 51), and Basic Brown 16 (basic brown 16) are preferred.

[0019] Examples of acid dyes include Red No. 2, Red No. 3, Red No. 102, Red No. 104 (1), Red No. 105 (1), Red No. 106, Red No. 230 (1), Yellow No. 4, Yellow No. 202 (1), Yellow No. 202 (2), Yellow No. 203, Orange No. 205, Orange No. 207, Orange No. 402, Green No. 3, Green No. 204, Green No. 401, Purple No. 401, Blue No. 1, Blue No. 2, Blue No. 202, Brown No. 201, and Black No. 401. Of these, Purple No. 401 is preferred.

[0020] Examples of natural dyes include gardenia dye, turmeric dye, annatto dye, copper chlorophyllin sodium, paprika dye, lac dye, safflower dye, henna, etc. Examples of nitro dyes include 4-nitro-o-phenylenediamine, 2-nitro-p-phenylenediamine, 2-amino-4-nitrophenol, 2-amino-5-nitrophenol, picramic acid, picric acid, and salts thereof.

[0021] Examples of HC dyes include HC Blue No. 2, HC Blue No. 5, HC Blue No. 9, HC Blue No. 10, HC Blue No. 11, HC Blue No. 12, HC Blue No. 16, HCO range No. 1, HCO range No. 2, HC Red No. 1, HC Red No. 3, HC Red No. 10, HCViolet No. 1, HCViolet No. 2, HC Yellow No. 2, HC Yellow No. 4, HC Yellow No. 10, HC Yellow No. 11, and HC Yellow No. 12.

[0022] Examples of disperse dyes include Disperse Black 9, Disperse Blue 1, Disperse Blue 3, Disperse Brown 4, Disperse Orange 3, Disperse Red 11, Disperse Red 15, Disperse Red 17, Disperse Violet 1, Disperse Violet 4, and Disperse Violet 15.

[0023] The direct dye may contain only one of these or a combination of two or more of them depending on the desired color tone. Among these, basic dyes, acid dyes, and HC dyes are preferred, with basic dyes being particularly preferred, from the viewpoints of improving spreadability when applied to hair and suppressing dripping from the hair.

[0024] The content of the direct dye relative to the total amount of the first composition is not particularly limited and can be appropriately determined depending on the tone and shade of the desired hair color.The lower limit of the content is, for example, 0.0005% by weight or more, for example, 0.001% by weight or more, for example, 0.003% by weight or more, for example, 0.01% by weight or more, for example, 0.03% by weight or more, for example, 0.09% by weight or more, or for example, 0.1% by weight or more.The upper limit of the content is, for example, 1.5% by weight or less, for example, 1% by weight or less, for example, 0.9% by weight or less, for example, 0.8% by weight or less, for example, 0.7% by weight or less, for example, 0.6% by weight or less, or for example, 0.5% by weight or less. The range of the content can be set by appropriately combining the above-mentioned upper and lower limits, for example, 0.0005% by weight to 1.5% by weight, for example, 0.001% by weight to 1% by weight, for example, 0.003% by weight to 0.9% by weight, for example, 0.01% by weight to 0.8% by weight, for example, 0.03% by weight to 0.7% by weight, for example, 0.09% by weight to 0.6% by weight, or for example, 0.1% by weight to 0.5% by weight. A content of 0.0005% by weight or more is likely to provide sufficient hair dyeing power. Furthermore, a content of 1.5% by weight or less is likely to provide improved agent stability, improved spreadability when applied to hair, and reduced dripping from hair.

[0025] [First surfactant] The first surfactant solubilizes or emulsifies each component of the first composition during use, adjusting viscosity and improving viscosity stability. Examples of the first surfactant include amphoteric surfactants, anionic surfactants, cationic surfactants, and nonionic surfactants. The first surfactant includes at least two ionic surfactants having different polarities from each other. That is, the first surfactant includes at least two of amphoteric surfactants, anionic surfactants, and cationic surfactants.

[0026] Examples of amphoteric surfactants include amino acid type amphoteric surfactants and betaine type amphoteric surfactants.

[0027] Examples of amino acid amphoteric surfactants include glycine amphoteric surfactants such as N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium (sodium lauroamphoacetate), alkyldiaminoethylglycine hydrochloride, sodium lauryldiaminoethylglycine, and palm oil fatty acid acyl-N-carboxyethyl-N-hydroxyethylethylenediamine sodium, and aminopropionic acid amphoteric surfactants such as sodium laurylaminopropionate, sodium laurylaminodipropionate, and triethanolamine laurylaminopropionate. Among these, from the viewpoints of foam performance and detergency, aminopropionic acid amphoteric surfactants such as sodium laurylaminopropionate, sodium laurylaminodipropionate, and triethanolamine laurylaminopropionate are preferred, with sodium laurylaminopropionate being particularly preferred.

[0028] Examples of betaine-type amphoteric surfactants include aminoacetic acid betaine-type amphoteric surfactants such as lauryl dimethyl aminoacetic acid betaine (lauryl betaine), coconut oil alkyl betaine, myristyl dimethyl aminoacetic acid betaine, sodium stearyl dimethyl betaine, coconut oil fatty acid amidopropyl betaine (cocamidopropyl betaine), palm oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, ricinoleic acid amidopropyl betaine, and stearyl dihydroxyethyl betaine; and sulfobetaine-type amphoteric surfactants such as lauryl hydroxysulfobetaine. Among these, from the viewpoints of foam performance and detergency, aminoacetic acid betaine-type amphoteric surfactants such as lauryl dimethyl aminoacetic acid betaine, coconut oil alkyl betaine, myristyl dimethyl aminoacetic acid betaine, sodium stearyl dimethyl betaine, coconut oil fatty acid amidopropyl betaine, palm oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, ricinoleic acid amidopropyl betaine, and stearyl dihydroxyethyl betaine are preferred, with lauryl betaine and lauric acid amidopropyl betaine being particularly preferred.

[0029] Examples of anionic surfactants include sodium lauryl sulfate, sodium cetyl sulfate, sodium polyoxyethylene (hereinafter referred to as "POE") lauryl ether sulfate, ammonium POE lauryl ether sulfate, sodium lauroyl methylalanine, hydrogenated sodium coconut oil fatty acid glyceryl sulfate, sulfate ester salts of higher fatty acid alkylolamides, sulfated castor oil, lauryl phosphate, POE oleyl ether phosphate, tetradecene sulfonate, sulfonate salts of higher fatty acid esters, sodium coconut oil fatty acid methyl taurate, triethanolamine dodecylbenzenesulfonate, sodium sulfosuccinate, sodium lauroyl sarcosine, sodium lauroyl glutamate, sodium lauroyl aspartate, triethanolamine coconut oil fatty acid acyl glutamate (TEA-cocoyl glutamate), and sodium POE lauryl ether acetate. Among these, from the viewpoints of foam performance and detergency, sodium lauryl sulfate, sodium cetyl sulfate, sodium POE lauryl ether sulfate, sodium lauroylmethylalanine, sodium coconut oil fatty acid methyl taurate, sodium lauroyl glutamate, sodium lauroylaspartate, and coconut oil fatty acid acyl glutamate triethanolamine are preferred, with sodium lauroylmethylalanine and sodium lauroylaspartate being particularly preferred.

[0030] Examples of cationic surfactants include lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, distearyldimethylammonium chloride, behenyltrimethylammonium methylsulfate, tri(polyoxyethylene)stearylammonium chloride, Quaternium-91 (INCI name), behenyltrimethylammonium chloride, distearyldimethylammonium chloride, lanolin fatty acid amide propylethyldimethylammonium ethyl sulfate, cetyltrimethylammonium bromide, stearyltrimethylammonium bromide, stearyltrimethylammonium saccharin, cetyltrimethylammonium saccharin, and N,N-di(acyloxy)-N-(hydroxyethyl)-N-methylammonium methosulfate.

[0031] Examples of nonionic surfactants include POE alkyl ethers, POE alkyl phenyl ethers, POE-polyoxypropylene alkyl ethers, POE sorbitan fatty acid esters, POE propylene glycol fatty acid esters, aliphatic alkanolamides such as coconut oil fatty acid monoethanolamide, POE alkyl glucoside, and polyoxyalkylene alkyl diethers.

[0032] As described above, the first composition contains at least two ionic surfactants having different polarities from the surfactants described above, but may contain three or more of the surfactants described above. The first composition may contain only one of the various surfactants, or a combination of two or more. For example, when the first composition contains an amphoteric surfactant, it may contain only one of the amphoteric surfactants described above, or a combination of two or more. Among these, it is preferable that the first composition contains at least an amphoteric surfactant and an anionic surfactant.

[0033] The content of the first surfactant relative to the total amount of the first composition is not particularly limited, but the lower limit of the content is, for example, 1% by weight or more, for example, 3% by weight or more, for example, 5% by weight or more, for example, 7% by weight or more, for example, 10% by weight or more, or for example, 15% by weight or more. The upper limit of the content is, for example, 50% by weight or less, for example, 40% by weight or less, for example, 35% by weight or less, for example, 30% by weight or less, for example, 25% by weight or less, or for example, 20% by weight or less. The range of the content can be set by appropriately combining the above upper and lower limits, for example, 1% by weight or more to 50% by weight or less, for example, 3% by weight or more to 40% by weight or less, for example, 5% by weight or more to 35% by weight or less, for example, 7% by weight or more to 30% by weight or less, for example, 10% by weight or more to 25% by weight or less, or for example, 15% by weight or more to 20% by weight or less. A content of 1% by weight or more can provide sufficient foam performance and cleansing properties. If the content is 50% by weight or less, the feel during rinsing and the feel after finishing can be improved.

[0034] When the first composition contains an amphoteric surfactant and an ionic surfactant as the first surfactant, the ratio of the content of the ionic surfactant to the content of the amphoteric surfactant (hereinafter referred to as the "first value") is not particularly limited. The lower limit of the first value is, for example, 0.1 or more, for example, 0.2 or more, for example, 0.3 or more, for example, 0.4 or more, or for example, 0.5 or more. The upper limit of the first value is, for example, 2 or less, for example, 1.8 or less, for example, 1.5 or less, for example, 1.3 or less, or for example, 1 or less. The range of the first value can be set by appropriately combining the above-mentioned upper and lower limits, for example, 0.1 or more and 2 or less, for example, 0.2 or more and 1.8 or less, for example, 0.3 or more and 1.5 or less, for example, 0.4 or more and 1.3 or less, or for example, 0.5 or more and 1 or less. When the first value is within the above range, appropriate cleansing properties and a finished feel can be obtained.

[0035] [Second hair cosmetic composition] The second hair cosmetic composition (hereinafter simply referred to as the "second composition") contains a second surfactant. The second composition does not contain a direct dye. That is, the second composition does not have the function of dyeing hair.

[0036] [Second surfactant] The second surfactant solubilizes each component of the second composition during use, adjusting viscosity and improving viscosity stability. Examples of the second surfactant include the same surfactants as the first surfactant described above. The second composition contains at least two ionic surfactants with different polarities. That is, the second surfactant contains at least two of an amphoteric surfactant, an anionic surfactant, and a cationic surfactant. The second composition may contain three or more of the above-mentioned surfactants. The second composition may contain only one of the various surfactants or a combination of two or more. Among these, it is preferable that the second composition contain at least an amphoteric surfactant and an anionic surfactant. Among the above-mentioned surfactants, from the viewpoints of foam performance and cleansing ability, cocamidopropyl betaine and lauric acid amidopropyl betaine are preferred as amphoteric surfactants, and TEA-cocoyl glutamate and sodium lauroyl methylalanine are preferred as anionic surfactants.

[0037] The content of the second surfactant relative to the total amount of the second composition is not particularly limited, but the lower limit of the content is, for example, 1% by weight or more, for example, 3% by weight or more, for example, 5% by weight or more, for example, 7% by weight or more, for example, 10% by weight or more, or for example, 15% by weight or more. The upper limit of the content is, for example, 50% by weight or less, for example, 40% by weight or less, for example, 35% by weight or less, for example, 30% by weight or less, for example, 25% by weight or less, or for example, 20% by weight or less. The range of the content can be set by appropriately combining the above upper and lower limits, for example, 1% by weight or more to 50% by weight or less, for example, 3% by weight or more to 40% by weight or less, for example, 5% by weight or more to 35% by weight or less, for example, 7% by weight or more to 30% by weight or less, for example, 10% by weight or more to 25% by weight or less, or for example, 15% by weight or more to 20% by weight. A content of 1% by weight or more can provide sufficient foam performance and cleansing properties. If the content is 50% by weight or less, the feel during rinsing and the feel after finishing can be improved.

[0038] When the second composition contains an amphoteric surfactant and an ionic surfactant as the second surfactant, the ratio of the content of the ionic surfactant to the content of the amphoteric surfactant (hereinafter referred to as the "second value") is not particularly limited. The lower limit of the second value is, for example, 0.1 or more, for example, 0.2 or more, for example, 0.3 or more, for example, 0.4 or more, or for example, 0.5 or more. The upper limit of the second value is, for example, 2 or less, for example, 1.8 or less, for example, 1.5 or less, for example, 1.3 or less, or for example, 1 or less. The range of the second value can be set by appropriately combining the above-mentioned upper and lower limits, for example, 0.1 to 2 or less, for example, 0.2 to 1.8 or less, for example, 0.3 to 1.5 or less, for example, 0.4 to 1.3 or less, or for example, 0.5 to 1 or less. When the second value is within the above range, appropriate cleansing properties and finished feel can be obtained.

[0039] [Other ingredients] In addition to the above-mentioned components, the first composition and the second composition may contain an appropriately selected solvent, oily component, pH adjuster, chelating agent, etc., as long as the properties and effects of each composition are not impaired. Each of the first composition and the second composition may contain only one of these, or a combination of two or more.

[0040] [solvent] Examples of solvents include water and organic solvents. Examples of organic solvents include ethanol, isopropanol, benzyl alcohol, benzyloxyethanol, glycol, and glycerin. Examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, and 1,3-butylene glycol. Examples of glycerin include glycerin, diglycerin, and polyglycerin. These solvents may be used alone or in combination of two or more.

[0041] [Oily ingredients] The oily component is blended to make the hair supple and to form the first and second compositions into the desired formulation. Examples of the oily component include silicone derivatives, polyhydric alcohols, oils and fats, waxes, higher alcohols, higher fatty acids, alkyl glyceryl ethers, and esters.

[0042] Examples of silicone derivatives include dimethylpolysiloxane and its hydroxy-terminated derivatives (e.g., dimethiconol), poly(oxyethylene-oxypropylene)-butylene-methylpolysiloxane copolymer, polyether-modified silicone, dimethylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, amino-modified silicone, dimethicone / vinyldimethicone crosspolymer, betaine-modified silicone, alkyl-modified silicone, and alkoxy-modified silicone. Among these, poly(oxyethylene-oxypropylene)-butylene-methylpolysiloxane copolymer, dimethiconol, and polyether-modified silicone are particularly preferred. However, the first composition does not necessarily contain a silicone derivative.

[0043] Examples of polyhydric alcohols include glycols, glycerins, and alicyclic polyols. Examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, and 1,3-butylene glycol. Examples of glycerins include glycerin, diglycerin, and polyglycerin. Examples of alicyclic polyols include cyclopentane polyols and cyclohexane polyols such as inositol.

[0044] Examples of fats and oils include various vegetable oils, animal oils, etc. Examples of waxes include beeswax, candelilla wax, carnauba wax, jojoba oil, lanolin, etc.

[0045] Examples of higher alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol (cetanol), stearyl alcohol, cetostearyl alcohol, arachyl alcohol, behenyl alcohol, 2-hexyldecanol, isostearyl alcohol, 2-octyldodecanol, decyltetradecanol, oleyl alcohol, linoleyl alcohol, linolenyl alcohol, and lanolin alcohol.

[0046] Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, hydroxystearic acid, 12-hydroxystearic acid, oleic acid, undecylenic acid, linoleic acid, ricinoleic acid, and lanolin fatty acid.

[0047] Examples of alkyl glyceryl ethers include batyl alcohol (monostearyl glyceryl ether), chimyl alcohol (monocetyl glyceryl ether), selachyl alcohol (monooleyl glyceryl ether), and isostearyl glyceryl ether.

[0048] Examples of esters include any monocarboxylic acid ester, dicarboxylic acid monoester, and dicarboxylic acid diester other than component (B). Examples include various monoesters of dicarboxylic acids such as oxalic acid, succinic acid, sebacic acid, and adipic acid. Other examples include various esters of monocarboxylic acids such as lactic acid, acetic acid, stearic acid, myristic acid, ricinoleic acid, octanoic acid, and isooctanoic acid.

[0049] [pH adjuster] A pH adjuster may be contained to adjust the pH of the first composition and the second composition. Examples of pH adjusters include alkaline agents, inorganic acids, organic acids, and salts thereof. Examples of alkaline agents include ammonia, alkanolamines, silicates, carbonates, bicarbonates, metasilicates, sulfates, chlorides, phosphates, organic amines, basic amino acids, and hydroxides of alkali metals or alkaline earth metals.

[0050] Examples of inorganic acids include phosphoric acid, hydrochloric acid, nitric acid, sulfuric acid, and boric acid. Examples of phosphoric acids include orthophosphoric acid, polyphosphoric acid, pyrophosphoric acid, and metaphosphoric acid. Examples of organic acids include pyrrolidonecarboxylic acid, citric acid, glycolic acid, tartaric acid, lactic acid, malic acid, levulinic acid, succinic acid, fumaric acid, oxalic acid, maleic acid, gluconic acid, mandelic acid, glucuronic acid, acetic acid, butyric acid, valeric acid, and benzoic acid. Examples of salts include sodium salts, potassium salts, and ammonium salts. The pH adjuster may contain only one of these acids or a combination of two or more of them.

[0051] [Chelating agent] Examples of chelating agents include ethylenediaminetetraacetic acid (EDTA, edetic acid), hydroxyethylethylenediaminetriacetic acid (HEDTA) and its salts, diethylenetriaminepentaacetic acid and its salts, and hydroxyethanediphosphonic acid (HEDP, etidronic acid) and its salts.

[0052] Furthermore, the first composition and the second composition may contain, as necessary, at least one selected from preservatives such as parabens, methylparaben, sodium benzoate, etc.; organic solvents such as ethanol, etc.; sugars such as monosaccharides such as glucose and galactose, disaccharides such as maltose, sucrose, fructose, trehalose, etc., and sugar alcohols, etc.; stabilizers such as phenacetin, 8-hydroxyquinoline, acetanilide, sodium pyrophosphate, barbituric acid, uric acid, and tannic acid, etc.; inorganic salts such as sodium chloride and sodium carbonate, antipruritic agents such as salicylic acid and its derivatives, animal and plant extracts, herbal extracts, vitamins, fragrances, propellants, thickeners, and ultraviolet absorbers, as well as those listed in the "Standards for Quasi-drug Raw Materials" (published in June 2006 by Yakuji Nipposha).

[0053] [Dosage form] The dosage forms of the first composition and the second composition can be selected from various known dosage forms. Examples of dosage forms include liquid, emulsion, cream, gel, paste, spray mist, aerosol foam, etc. Among these, liquid and gel forms are preferred.

[0054] [Method of using the hair treatment composition] In a method of using the present hair treatment composition, the first composition and the second composition are applied to the hair separately. The first composition and the second composition can be applied alternately and repeatedly to the hair. For example, one composition can be applied to the hair immediately after application of the other composition, or after a certain time has passed since application. The compositions may also be applied consecutively to the hair. For example, the first composition may be applied once to the hair, and then the second composition may be applied two or more times consecutively. Furthermore, after each application of each composition, the composition may be washed off by rinsing the hair with water.

[0055] The first composition and the second composition can be used to cleanse hair, for example, as a detergent composition that is dispensed in liquid form and foamed before use. Examples of detergent compositions include shampoo, rinse, conditioner, and treatment. The first composition and the second composition may be applied to wet or dry hair. The first composition and the second composition are preferably applied to wet hair. The method for applying the first composition and the second composition to hair is not particularly limited, and examples include application with a hand comb, application with a spray, and application with a comb or brush. The first composition and the second composition are foamed in a conventional manner and then rinsed off with water, hot water, or the like. The first composition and the second composition can be used as a regular shampoo, but can also be used as a shampoo immediately after hair dyeing with a hair dye composition containing an oxidation dye, or after a certain time has passed since hair dyeing with the hair dye composition. By applying the first composition to hair after treatment with the hair dye composition, the dye can be replenished to the dyed hair, maintaining the hair color and providing a color change that suits the user's preferences.

[0056] The first composition can be used, in particular, as a hair color shampoo, a hair color treatment, a hair color rinse, or a hair color conditioner, and the second composition can be used, in particular, as a hair color care shampoo, a hair color care treatment, a hair color care rinse, or a hair color care conditioner.

[0057] When the first composition and the second composition are used on hair, the lower limit of the ratio of the content of the first surfactant in the first composition to the content of the second surfactant in the second composition is, for example, 0.1 or more, for example, 0.3 or more, for example, 0.5 or more, or for example, 0.8 or more. The upper limit of this ratio is, for example, 2.0 or less, for example, 1.8 or less, for example, 1.5 or less, or for example, 1.2 or less. The range of this ratio can be set by appropriately combining the above upper and lower limits, for example, 0.1 or more and 2.0 or less, for example, 0.3 or more and 1.8 or less, for example, 0.5 or more and 1.5 or less, or for example, 0.8 or more and 1.2 or less. In the second composition, when the ratio is 0.1 or more relative to the first composition, hair fading can be suitably suppressed, and when the ratio is 2 or less, the difference in feel during use between the first composition and the second composition can be reduced. Furthermore, in the first composition, when the ratio is 0.1 or more relative to the second composition, the difference in feel in use between the first composition and the second composition can be reduced, and when the ratio is 2 or less, excellent hair dyeing power can be obtained. In other words, by adjusting the ratio within the above range, it is possible to achieve the effects of improving hair dyeing power, improving feel in use, and suppressing fading.

[0058] Furthermore, when the first composition and the second composition are applied to hair, the lower limit of the ratio of the first value to the second value is, for example, 0.1 or more, for example, 0.3 or more, for example, 0.5 or more, or for example, 0.75 or more. The upper limit of this ratio is, for example, 2.0 or less, for example, 1.8 or less, for example, 1.5 or less, or for example, 1.2 or less. The range of this ratio can be set by appropriately combining the above upper and lower limits, for example, 0.1 or more and 2.0 or less, for example, 0.3 or more and 1.8 or less, for example, 0.5 or more and 1.5 or less, or for example, 0.75 or more and 1.2 or less. If this ratio is within the above range, hair discoloration can be easily controlled. In the second composition, when the ratio is 0.1 or more relative to the first composition, hair discoloration can be suitably suppressed, and when the ratio is 2 or less, the difference in usability between the first composition and the second composition can be reduced. In the first composition, when the ratio is 0.1 or more relative to the second composition, the difference in feel in use between the first composition and the second composition can be reduced, and when the ratio is 2 or less, excellent hair dyeing power can be obtained. In other words, by adjusting the ratio within the above range, it is possible to achieve the effects of improving hair dyeing power, improving feel in use, and suppressing fading. [Example]

[0059] Next, the present invention will be described in more detail with reference to examples and comparative examples, although the present invention is not limited to the examples described below.

[0060] (Preparation of the first composition and the second composition) A first composition and a second composition were prepared as the present hair treatment compositions by mixing the components shown in Tables 1 and 2. The numerical value in the column showing each component in each table indicates the content of that component in the composition, expressed in % by weight.

[0061] [Table 1]

[0062] [Table 2]

[0063] <Evaluation of hair dyeing power> A 10 cm long white hair bundle sample (manufactured by Bealux) for evaluation (hereinafter simply referred to as hair bundle) was washed with water and towel-dried, and 1 g of the first composition 1 to 21 (0.3 times the weight of the hair bundle) described in each example and comparative example was applied by massaging for 2 minutes, and then washed with water for 1 minute to prepare a dyed hair bundle.

[0064] Ten expert panelists visually observed the color development of each dyed hair strand under a standard light source and evaluated it according to the following criteria to determine whether the color development was good or not. Each expert panelist scored the results on a five-point scale: very good (5 points), good (4 points), good (3 points), slightly light (2 points), and very light (1 point). The panelists' scores were averaged, and the evaluation results were determined as follows: an average of 4.6 points or more was designated "excellent: 5," an average of 3.6 points to less than 4.6 points was designated "good: 4," an average of 2.6 points to less than 3.6 points was designated "fair: 3," an average of 1.6 points to less than 2.6 points was designated "slightly poor: 2," and an average of less than 1.6 points was designated "poor: 1." The results are shown in the "Dyeing Power" column of Tables 3 and 4.

[0065] <Evaluation of usability> Ten expert panelists applied the first composition 1 to 21 (0.3 times the amount) or the second composition 1 to 20 (0.3 times the amount) described in each example and comparative example to 1 g of a 10 cm long white hair bundle sample (manufactured by Bealux) for evaluation that had been washed with water and towel-dried (hereinafter simply referred to as a hair bundle) by massaging it in for 2 minutes, and then washed with water for 1 minute.

[0066] The evaluation of the usability was a comprehensive evaluation of the shampoo's "foam quality," "foaming," "foam retention," and "fingers running smoothly when rinsing." Each expert panelist rated each of the evaluation items "foam quality," "foaming," "foam retention," and "fingers running smoothly when rinsing" on a five-point scale: excellent (5 points), good (4 points), fair (3 points), somewhat good (2 points), somewhat poor (2 points), and poor (1 point). The average of the scores for the four evaluation items "foam quality," "foaming," "foam retention," and "fingers running smoothly when rinsing" was used as the score for the comprehensive evaluation by one expert panelist. The average score of each expert panelist was calculated, and the evaluation results were determined as follows: an average score of 4.6 or more was "excellent: 5", 3.6 to less than 4.6 was "good: 4", 2.6 to less than 3.6 was "fair: 3", 1.6 to less than 2.6 was "slightly poor: 2", and less than 1.6 was "poor: 1". The results are shown in the "Usage Feeling" column in Tables 3 and 4.

[0067] <Evaluation of bleaching suppression> First, a 10 cm long white hair bundle sample (manufactured by Bealux) for evaluation, which had been washed and towel-dried, was applied with 1 g of a first composition 1 to 21 (0.3 times the weight of the hair bundle) described in each Example and Comparative Example by massaging for 2 minutes, then rinsed with water for 1 minute, and the hair bundle was dried with warm air (hereinafter referred to as "step A"). After step A, a second composition 1 to 20 (0.3 times the weight of the hair bundle) described in each Example and Comparative Example was applied with massaging for 2 minutes, then rinsed with water for 1 minute. This step was repeated three times to create a dyed hair bundle S. After step A, a 1 g hair bundle was applied with a second composition 1 to 20 (0.3 times the weight of the hair bundle) described in each Example and Comparative Example by massaging for 2 minutes, then rinsed with water for 1 minute. This step was repeated six times to create a dyed hair bundle T.

[0068] Ten expert panelists visually evaluated the fading prevention effect (color retention) of the dyed hair tress T under a standard light source, using the dyed hair tress S of each example as the standard. Each expert panelist scored the fading prevention effect on a 5-point scale: excellent (5 points), excellent (4 points), good (3 points), poor (2 points), and very poor (1 point). The panelists' scores were averaged, and the evaluation results were determined as follows: an average of 4.6 points or more was designated "excellent (5)," an average of 3.6 points to less than 4.6 points was designated "good (4)," an average of 2.6 points to less than 3.6 points was designated "fair (3)," an average of 1.6 points to less than 2.6 points was designated "slightly poor (2)," and an average of less than 1.6 points was designated "poor (1)." The results are shown in the "Fade Prevention" column of Tables 3 and 4.

[0069] <Evaluation of color> First, a 10 cm long white hair bundle sample (manufactured by Bealux) for evaluation (hereinafter simply referred to as hair bundle) was washed with water and towel-dried, and 1 g of the first composition 1 to 21 (0.3 times the weight of the hair bundle) described in each Example and Comparative Example was applied to the hair bundle by massaging for 2 minutes, followed by rinsing with water for 1 minute, and then the hair bundle was dried with warm air (hereinafter referred to as step B). After step B, a 1 g hair bundle was applied to the second composition 1 to 20 (0.3 times the weight of the hair bundle) described in each Example and Comparative Example by massaging for 2 minutes, followed by rinsing with water for 1 minute, and this step was repeated three times (hereinafter referred to as step C) to prepare a dyed hair bundle.

[0070] Ten expert panelists evaluated the hair strands dyed after step C under a standard light source, using the hair strands dyed after step B for each example as a standard, to determine whether the resulting natural color was aesthetically pleasing (a natural, uncluttered look). If eight or more panelists agreed that the natural color was aesthetically pleasing, the evaluation was scored as "excellent: 5 points," if six to seven panelists agreed, the evaluation was scored as "good: 4 points," if four to five panelists agreed, the evaluation was scored as "fair: 3," if two to three panelists agreed, the evaluation was scored as "slightly poor: 2," and if one or less panelists agreed, the evaluation was scored as "poor: 1." The results are shown in the "Color" column of Tables 3 and 4.

[0071] [Table 3]

[0072] [Table 4]

[0073] As shown in Tables 3 and 4, in Examples 1 to 36, results of "pass" or better were obtained in all evaluation items.

[0074] In contrast, Comparative Example 1 received a poor evaluation for fading prevention and a somewhat poor evaluation for color tone. In Comparative Example 1, the second composition contains an anionic surfactant but no amphoteric surfactant. Because the second composition does not contain an amphoteric surfactant (i.e., a positively charged moiety) and contains a relatively large amount of anionic surfactant (15% by weight), when the second composition is applied to a hair strand, the negative charge of the anionic surfactant easily combines with the positive charge of the basic dyes (Basic Blue 75 and Basic Purple 2). Furthermore, in Comparative Example 1, the high content of anionic surfactant results in the high detergency of the second composition. This is thought to be why the basic dyes flow out of the hair strand during rinsing, reducing the fading prevention effect and resulting in an unnatural color tone.

[0075] In addition, Comparative Example 2 received a poor evaluation of usability and a somewhat poor evaluation of color. In Comparative Example 2, the first composition contained an anionic surfactant, while the second composition did not. Anionic surfactants lather and retain foam better than amphoteric surfactants. In Comparative Example 2, the second composition did not contain an anionic surfactant, which is thought to be the reason for the large difference in usability between the first and second compositions. In Comparative Example 2, the second composition did not contain an anionic surfactant, which is thought to be why the second composition had poor detergency. As a result, almost no basic dye was washed out of the hair strands during rinsing, and although the evaluation of color fading prevention was good, the basic dye remained strongly, resulting in an unnatural color.

[0076] In Comparative Example 3, the evaluation of hair dyeing power was particularly poor. In Comparative Example 3, the first composition contains an anionic surfactant but does not contain an amphoteric surfactant. In Comparative Example 3, the first composition containing the direct dye contains a relatively large amount of anionic surfactant (15% by weight), which is thought to have caused the poor dyeing of hair strands.

[0077] Furthermore, the evaluation of the feel during use in Comparative Example 4 was poor. In Comparative Example 4, the second composition contained an anionic surfactant, while the first composition did not. This is thought to have resulted in a large difference in feel during use between the first composition and the second composition, as in Comparative Example 2.

[0078] From the above results, it was found that the first composition and the second composition contain two types of ionic surfactants with different polarities, and thereby provide sufficient hair dyeing power, a favorable feel in use, and an excellent effect of inhibiting fading.

[0079] Furthermore, when comparing the individual Examples, the evaluations of hair dyeing power, usability, and fading inhibition were good or fair in Examples 2 to 4, 8 to 13, 16 to 22, 26 to 31, and 34 to 36. Considering these results, it was found that the greater the difference between the ratio of the total amount of amphoteric surfactant and anionic surfactant in the first composition and the total amount of amphoteric surfactant and anionic surfactant in the second composition, the more likely these evaluations would be lower (Examples 11 to 13, 16 to 18, 29 to 31, 34 to 36).

[0080] Focusing on the second composition, first, in Examples 11 to 13, the surfactant content in the second composition was higher than that in the reference first composition. The surfactant contributes to the cleansing power of the composition, such as lathering and lather retention when applied to hair. In Examples 11 to 13, the surfactant content in the second composition was relatively high, which is thought to have resulted in almost no difference in usability between the first and second compositions. On the other hand, a high surfactant content leads to strong cleansing power, and when the second composition is applied to a hair strand, the direct dye adhered to the hair strand may run off, slightly accelerating fading. Therefore, as shown in Examples 11 to 18, it is thought that the lower the surfactant content in the second composition, the better the evaluation of fading inhibition. In contrast, in Examples 16 to 18, the surfactant content in the second composition was lower than that in the reference first composition. Therefore, the cleansing power of the second composition was not particularly high, but a high fading inhibition effect was obtained. On the other hand, in Examples 16 to 18, the surfactant content of the second composition was low, and therefore it was inferior to the first composition in terms of foaming and foam retention. Therefore, as shown in Examples 11 to 18, it is believed that by increasing the surfactant content of the second composition, the difference in usability between the first and second compositions can be reduced.

[0081] Focusing on the first composition, in Examples 29 to 31, the surfactant content in the first composition was lower than that in the reference second composition. As mentioned above, a low surfactant content reduces the cleansing power for hair strands, such as foaming and foam retention. Therefore, as shown in Examples 29 to 36, it is believed that increasing the surfactant content in the second composition reduced the difference in usability between the first and second compositions. On the other hand, in Examples 29 to 31, the surfactant content in the first composition was relatively low, so the cleansing power of the first composition was not very high, and it is believed that the hair strands could be dyed satisfactorily. In contrast, in Examples 34 to 36, the surfactant content in the first composition was higher than that in the reference second composition. Because the surfactant content in the first composition was high, it is believed that there was almost no difference in usability between the first and second compositions. On the other hand, in Examples 34 to 36, the first composition had a high detergency, so the direct dye in the first composition was somewhat difficult to adhere to the hair strands. This is thought to be why, as shown in Examples 29 to 36, the hair dyeing power improved as the content of the first composition decreased.

[0082] From the above results, it can be seen that, in the second composition, by adjusting the ratio of the surfactant content in the first composition to the surfactant content in the second composition within a predetermined range, using the first composition 1 in Table 1 as a reference, it is possible to obtain the effects of suppressing fading and improving the feel in use. Also, it can be seen that, in the first composition, by adjusting the ratio of the surfactant content in the first composition to the surfactant content in the second composition within a predetermined range, using the second composition 1 in Table 2 as a reference, it is possible to obtain the effects of improving the feel in use and the hair dyeing power. In other words, it was found that by adjusting this ratio within a predetermined range, favorable results could be obtained in all evaluation items.

[0083] Furthermore, it was found that even if the ratio of the above total amounts in each composition is the same, the greater the difference between the ratios of the amphoteric surfactant content to the anionic surfactant content in each composition (i.e., the first value and the second value), the lower the evaluation scores can be (Examples 2-4, 8-10, 20-22, 26-28).

[0084] First, in Examples 2 to 4, the content of anionic surfactant in the second composition was high relative to the content of amphoteric surfactant. In Examples 2 to 4, the second composition contained a relatively high amount of anionic surfactant, so when the second composition was applied to a hair strand, the negative charge of the anionic surfactant readily combined with the positive charge of the basic dye. Therefore, as shown in Examples 2 to 10, the low content of anionic surfactant relative to the content of amphoteric surfactant likely prevented the basic dye from leaching from the hair strand during rinsing, resulting in improved anti-fading effects. Meanwhile, the anionic surfactant significantly contributes to the cleansing power of the hair strand. Because the second composition contained a relatively high amount of anionic surfactant, it is believed that there was little difference in the feel of use between the first and second compositions. In contrast, in Examples 8 to 10, the content of anionic surfactant in the second composition was low relative to the content of amphoteric surfactant. That is, the low negative charge of the surfactant in the second composition inhibits the basic dye attached to the hair from binding to the surfactant, which is thought to have enabled the second composition to effectively inhibit fading even when applied to a hair strand. On the other hand, in Examples 8 to 10, the second composition contained a low amount of anionic surfactant, which contributes to the cleansing power of hair strands, and therefore was slightly inferior to the first composition in terms of foaming and foam retention. Therefore, as shown in Examples 2 to 10, it is thought that the difference in usability between the first and second compositions could be reduced as the content of anionic surfactant in the second composition increased.

[0085] Next, in Examples 20 to 22, the content of anionic surfactant in the first composition was low relative to the content of amphoteric surfactant. In Examples 20 to 22, the low content of anionic surfactant in the first composition inhibited binding of the basic dye to the surfactant when the first composition was applied to a hair strand, presumably enabling successful dyeing of the hair strand. On the other hand, in Examples 20 to 22, the content of anionic surfactant in the first composition was low, resulting in slightly inferior foaming and foam retention compared to the first composition. Therefore, as shown in Examples 20 to 28, it is believed that the difference in usability between the first composition and the second composition can be reduced as the content of anionic surfactant in the first composition increases. In contrast, in Examples 26 to 28, the content of anionic surfactant in the first composition was high relative to the content of amphoteric surfactant. Therefore, when the first composition was applied to a hair strand, the basic dye was more likely to bind to the surfactant. This is thought to be why the hair dyeing power improved as the content of anionic surfactant decreased relative to the content of amphoteric surfactant, as shown in Examples 20 to 28. On the other hand, in Examples 26 to 28, the content of anionic surfactant in the first composition was high, so the first composition had high detergency and there was almost no difference in the feel when used between the first and second compositions.

[0086] From the above results, it can be seen that, in the second composition, by adjusting the ratio of the first value to the second value to within a predetermined range, using first composition 1 in Table 1 as a reference, it is possible to obtain the effects of inhibiting fading and improving the feel in use. Also, it can be seen that, in the first composition, by adjusting the ratio of the first value to the second value to within a predetermined range, using second composition 1 in Table 2 as a reference, it is possible to obtain the effects of improving the feel in use and the hair dyeing power. In other words, it was found that by adjusting the ratio to within a predetermined range, favorable results could be obtained in all evaluation items.

[0087] Furthermore, when focusing on the evaluation of color tone, it was found that the greater the deviation in the ratio of the total amount of amphoteric surfactant to anionic surfactant in each composition, or the ratio of the amphoteric surfactant content to the anionic surfactant content in each composition, relative to the first composition, the lower the evaluation of color tone (Examples 2-4, 8-13, 16-18). This is thought to be due to the cleansing power of the second composition, as explained in the discussion of the comparative examples. Specifically, as shown in Examples 11-18, the closer the ratio of the total amount of surfactant in each composition is to 1, the more appropriate the cleansing power of the second composition, which is thought to result in a more appropriate removal of dye from hair strands and a more natural color tone. Similarly, as shown in Examples 2-10, the closer the ratio of ionic surfactant to amphoteric surfactant in each composition is to 1, the more appropriate the cleansing power of the second composition, which is thought to result in a more appropriate removal of dye from hair strands and a more natural color tone.

[0088] In Example 19, the first composition contains an acid dye instead of a basic dye. Compared to a negatively charged acid dye, a positively charged basic dye is more likely to form an ionic bond with negatively charged hair. Therefore, Example 1, which differs from Example 19 only in the polarity of the dye, is thought to have resulted in a stronger hair-dyeing power than Example 19.

[0089] Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. The technical elements described in this specification or drawings exhibit technical utility either alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technology exemplified in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives is itself technically useful.

Claims

1. a first hair cosmetic composition containing a first surfactant and a direct dye; a second hair cosmetic composition containing a second surfactant and no direct dye; Equipped with the first surfactant comprises at least two ionic surfactants having different polarities; The second surfactant includes at least two ionic surfactants having different polarities from each other. Hair treatment composition.

2. 2. The hair treatment composition according to claim 1, wherein the ratio of the content of the first surfactant in the first hair cosmetic composition to the content of the second surfactant in the second hair cosmetic composition is 0.1 or more and 2 or less.

3. the first surfactant comprises a first amphoteric surfactant and a first anionic surfactant; The hair treatment composition according to claim 1 , wherein the second surfactant comprises a second amphoteric surfactant and a second anionic surfactant.

4. 4. The hair treatment composition according to claim 3, wherein, when a ratio of the content of the first anionic surfactant to the content of the first amphoteric surfactant in the first hair cosmetic composition is defined as a first value and a ratio of the content of the second anionic surfactant to the content of the second amphoteric surfactant in the second hair cosmetic composition is defined as a second value, the ratio of the first value to the second value is 0.1 or more and 2 or less.

5. The hair treatment composition according to claim 1 , wherein the direct dye of the first hair cosmetic composition comprises a basic dye.

6. The hair treatment composition according to claim 1 , wherein the hair treatment composition is applied to hair after a hair dye composition has been applied thereto.

7. The hair treatment composition according to claim 6 , wherein the hair dye composition contains an oxidation dye.

8. The hair treatment composition according to claim 1 , wherein the first hair cosmetic composition is substantially free of silicone.

9. The hair treatment composition according to any one of claims 1 to 8, wherein the hair treatment composition is a hair wash composition for washing hair.

10. A method for using a hair treatment composition, comprising: a first step of applying to hair a first hair cosmetic composition containing a first surfactant and a direct dye; a second step of applying to the hair a second hair cosmetic composition containing a second surfactant and no direct dye; Equipped with the first surfactant comprises at least two ionic surfactants having different polarities; the second surfactant comprises at least two ionic surfactants having different polarities; A method of use in which the first step and the second step are repeatedly performed on the hair.

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