Hair washing composition and washing method

Abstract

To provide a hair washing composition capable of solubilizing cationic polymer while reducing an amount of an anionic surfactant, and to provide a washing method using the same.SOLUTION: The hair washing composition of the present invention contains (A) at least one of specific amphoteric surfactants, (B) a cationic polymer, and (C) water, and is characterized in that an amount of the component (A) is 4 mass% or more, an amount of the component (B) is 0.1 mass% or more, (D) an anionic surfactant is not blended, or (D) an anionic surfactant is blended in an amount of 5 mass% or less, (E) a nonionic surfactant is not blended, or (E) a nonionic surfactant is blended in an amount of 4 mass% or less, and an amount of all amphoteric surfactants is 11 pts.mass or more when the amount of the component (B) is 1 pt.mass.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a hair washing composition and a washing method using the same. [Background technology]

[0002] Hair wash compositions such as shampoos contain surfactants as hair wash ingredients, and in addition to surfactants, hair wash compositions contain various other ingredients for the purpose of imparting specific functions.

[0003] As an example of a hair washing composition, Patent Document 1 discloses a shampoo containing at least an acylamino acid or a salt thereof, an α-olefin sulfonate, an amphoteric surfactant, and a polyoxyethylene fatty acid methyl glucoside. The shampoo in Patent Document 1 is described as having excellent foaming and ease of use. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-91723 Summary of the Invention [Problem to be solved by the invention]

[0005] Anionic surfactants are commonly used as hair wash ingredients in hair wash compositions, as shown in Patent Document 1. Anionic surfactants tend to cause color fading on dyed hair relatively easily and have a strong ability to cleanse sebum.

[0006] Furthermore, cationic polymers are also commonly used in hair washing compositions to improve the feel of hair after washing (for example, claim 3 of Patent Document 1 above).

[0007] Depending on the composition of the hair wash composition, cationic polymers may be difficult to dissolve in water, which is the solvent of the hair wash composition. However, the use of an anionic surfactant can solubilize the cationic polymer. However, the incorporation of an anionic surfactant tends to cause discoloration of dyed hair and to have a strong sebum cleansing effect. Therefore, if the amount of anionic surfactant in the hair wash composition is reduced to reduce these tendencies, it can sometimes become difficult to solubilize the cationic polymer. If the solubility of the cationic polymer decreases, the feel and stability (the ability of the cationic polymer to remain dissolved in the solvent) of the hair wash composition will be impaired.

[0008] For these reasons, there is a demand for the development of a technology that can solubilize cationic polymers while reducing the amount of anionic surfactants in hair washing compositions.

[0009] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hair washing composition that can solubilize a cationic polymer while reducing the amount of anionic surfactant, and a washing method using the same. [Means for solving the problem]

[0010] The hair washing composition of the present invention comprises: (A) at least one amphoteric surfactant selected from the group consisting of alkyldimethylaminoacetic acid betaine, alkylamidopropyl betaine having a hydrocarbon group having from 8 to 16 carbon atoms, imidazolium betaine, alkylamidopropyl hydroxysultaine, alkylhydroxysultaine, alkylaminopropionic acid or a salt thereof, and alkylamine oxide; (B) a cationic polymer, and (C)Water is blended, The blending amount of the (A) component is 4% by mass or more, and the blending amount of the (B) component is 0.1% by mass or more, (D) Anionic surfactant is not blended, or (D) Anionic surfactant is blended in an amount of 5% by mass or less, (E) The nonionic surfactant is not blended, or (E) The nonionic surfactant is blended in an amount of 4% by mass or less, The composition is characterized in that when the blending amount of the component (B) is taken as 1 part by mass, the blending amount of all amphoteric surfactants is 11 parts by mass or more.

[0011] The washing method of the present invention is characterized by using the hair washing composition of the present invention. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a hair washing composition that can solubilize a cationic polymer while reducing the amount of anionic surfactant, and a washing method using the same. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a photograph showing the appearance of the hair wash composition of Example 9. [Figure 2] 1 is a photograph showing the appearance of the hair wash composition of Comparative Example 4. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, the present invention will be described based on an embodiment of the present invention (hereinafter referred to as the present embodiment).

[0015] <Hair cleansing composition> The hair wash composition of this embodiment contains (A) at least one amphoteric surfactant selected from the group consisting of alkyldimethylaminoacetic acid betaine, alkylamidopropyl betaine having a hydrocarbon group containing from 8 to 16 carbon atoms, imidazolium betaine, alkylamidopropyl hydroxysultaine, alkylhydroxysultaine, alkylaminopropionic acid or a salt thereof, and alkylamine oxide (hereinafter sometimes referred to as component (A)), (B) a cationic polymer (hereinafter sometimes referred to as component (B)), and (C) water. The amount of component (A) is 4% by mass or more, the amount of component (B) is 0.1% by mass or more, and when the amount of component (B) is taken as 1 part by mass, the amount of all amphoteric surfactants is 11 parts by mass or more.

[0016] The hair wash composition of this embodiment does not contain an anionic surfactant (D) (hereinafter sometimes referred to as component (D)), or contains component (D) in an amount of 5 mass % or less. Even if the hair wash composition of this embodiment does not contain an anionic surfactant or contains a limited amount of an anionic surfactant, it still achieves an excellent level of solubilization of the cationic polymer by using a specific amphoteric surfactant, component (A), and adjusting the relationship between the amount of all amphoteric surfactants, including component (A), and the amount of cationic polymer. Furthermore, if the amount of anionic surfactant in the hair wash composition is low or if no anionic surfactant is contained in the hair wash composition, for example, the hair cleansing power will be reduced. However, the hair wash composition of this embodiment exhibits good hair cleansing power due to the action of component (A), which is contained in a specific amount.

[0017] In addition, when a hair wash composition contains a nonionic surfactant (E) (hereinafter, sometimes referred to as component (E)), the component (E) is solubilized or dispersed in a solvent, thereby inhibiting the solubilization of the cationic polymer. Therefore, in the hair wash composition of this embodiment, by not including component (E) or limiting the amount of component (E) included, the inhibitory effect of these components on the solubilization of the cationic polymer can be suppressed.

[0018] (A) Amphoteric surfactant The hair wash composition of the present embodiment contains, as component (A), at least one or two or more compounds selected from the group consisting of alkyldimethylaminoacetic acid betaine, alkylamidopropyl betaine having a hydrocarbon group having from 8 to 16 carbon atoms, imidazolium betaine, alkylamidopropyl hydroxysultaine, alkylhydroxysultaine, alkylaminopropionic acid or a salt thereof, and alkylamine oxide.

[0019] The alkyldimethylaminoacetic acid betaine is, for example, represented by the following general formula (1). R a -N + (CH3)2-CH2COO - (1) [In the above general formula (1), R a represents a saturated or unsaturated hydrocarbon group (the hydrocarbon group may be linear or branched), for example, a hydrocarbon group having 8 to 18 carbon atoms.

[0020] Examples of the cosmetic names of alkyldimethylaminoacetic acid betaines include lauryl betaine, myristyl betaine, cocobetaine, cetyl betaine, oleyl betaine, stearyl betaine, and behenyl betaine.

[0021] The alkylamidopropyl betaine having a hydrocarbon group having 8 to 16 carbon atoms is, for example, represented by the following general formula (2). R b -CO-NH(CH2)3-N + (CH3)2-CH2COO - (2) [In the above general formula (2), R b represents a saturated or unsaturated hydrocarbon group (the hydrocarbon group may be linear or branched), for example, a hydrocarbon group having 8 to 16 carbon atoms.

[0022] Examples of the cosmetic names of alkylamidopropyl betaines having a hydrocarbon group with 8 to 16 carbon atoms include (capryl / capramido)propyl betaine, undecylenamidopropyl betaine, lauramidopropyl betaine, cocamidopropyl betaine, myristamidopropyl betaine, and oleamidopropyl betaine.

[0023] The imidazolium betaine is, for example, represented by the following general formula (3). R c -CO-NH(CH2)3-N(CH2CH2OH)-CH2COOX a (3) [In the above general formula (3), R c represents a saturated or unsaturated hydrocarbon group (the hydrocarbon group may be linear or branched), for example, a hydrocarbon group having 8 to 18 carbon atoms. a is hydrogen, an alkali metal (such as sodium or potassium), an alkaline earth metal, ammonium, an alkanolamine, or a basic amino acid.

[0024] Examples of cosmetic label names for imidazolium betaines include sodium caproamphoacetate, sodium lauroamphoacetate, sodium cocoamphoacetate, sodium oleoamphoacetate, sodium stearoamphoacetate, sodium isostearoamphoacetate, sodium arganamphoacetate, sodium oliveamphoacetate, sodium cacao butteramphoacetate, sodium sesameamphoacetate, sodium shea butteramphoacetate, sodium sweet almondamphoacetate, sodium babassuamphoacetate, sodium sunflower seedamphoacetate, sodium mangoamphoacetate, and sodium cottonseedamphoacetate.

[0025] The alkylamidopropylhydroxysultaine is, for example, represented by the following general formula (4): R d CONH(CH2)3-N + (CH3)2-CH2CH(OH)CH2SO3 - (4) [In the above general formula (4), R drepresents a saturated or unsaturated hydrocarbon group (the hydrocarbon group may be linear or branched), for example, a hydrocarbon group having 8 to 18 carbon atoms.

[0026] Examples of the cosmetic names of alkylamidopropyl hydroxysultaines include lauramidopropyl hydroxysultaine, babassuamidopropyl hydroxysultaine, cocamidopropyl hydroxysultaine, cannabisamidopropyl hydroxysultaine, and erucamidopropyl hydroxysultaine.

[0027] The alkylhydroxysultaine is, for example, represented by the following general formula (5): R e -N + (CH3)2-CH2CH(OH)CH2SO3 - (5) [In the above general formula (5), R e represents a saturated or unsaturated hydrocarbon group (the hydrocarbon group may be linear or branched), for example, a hydrocarbon group having 8 to 18 carbon atoms.

[0028] An example of the alkyl hydroxysultaine name used in cosmetics is lauryl hydroxysultaine.

[0029] The alkylaminopropionic acid or a salt thereof is, for example, represented by the following general formula (6). R f NHCH2CH2COOX b (6) [In the above general formula (6), R f represents a saturated or unsaturated hydrocarbon group (the hydrocarbon group may be linear or branched), for example, a hydrocarbon group having 8 to 18 carbon atoms. b is hydrogen, an alkali metal (such as sodium or potassium), an alkaline earth metal, ammonium, an alkanolamine, or a basic amino acid.

[0030] Examples of the cosmetic names of alkylaminopropionic acids or their salts include sodium lauraminopropionate, sodium cocaminopropionate, and DEA lauraminopropionate.

[0031] The alkylamine oxide is, for example, represented by the following general formula (7). R g -(CH3)2N + -O - (7) [In the above general formula (7), R g represents a saturated or unsaturated hydrocarbon group (the hydrocarbon group may be linear or branched), for example, a hydrocarbon group having 8 to 18 carbon atoms.

[0032] Examples of the alkylamine oxides, which are labeled as such in cosmetics, include decylamine oxide, lauramine oxide, oleamine oxide, stearamine oxide, cocoamine oxide, myristamine oxide, behenamine oxide, and decyltetradecylamine oxide.

[0033] The hair wash composition of this embodiment preferably contains, as component (A), one or more compounds selected from alkyl betaines, amidopropyl hydroxysultaines, and alkyl hydroxysultaines. Alkyl betaines are excellent at preventing fading of dyed hair, and amidopropyl hydroxysultaines or alkyl hydroxysultaines are excellent at foaming during hair washing.

[0034] The hair wash composition of the present embodiment may contain, as component (A), one or more selected from lauryl betaine, lauramidopropyl betaine, cocamidopropyl betaine, sodium cocoamphoacetate, lauramidopropyl hydroxysultaine, lauryl hydroxysultaine, sodium lauraminopropionate, and lauramine oxide.

[0035] The blending amount of component (A) in the hair wash composition of this embodiment is, for example, 4% by mass or more, and from the viewpoint of improving hair cleansing power, it is preferably 8% by mass or more, and more preferably 10% by mass or more, and from the viewpoint of reducing the risk of skin irritation, it is preferably 20% by mass or less, and more preferably 18% by mass or less.

[0036] The hair wash composition of this embodiment may contain, in addition to component (A), one or more amphoteric surfactants other than component (A). Examples of amphoteric surfactants other than component (A) that are commonly used in the cosmetics field (excluding those that fall under component (A)) can be used as amphoteric surfactants other than component (A). Examples of amphoteric surfactants other than component (A) that are listed by their cosmetic labeling names include isostearamidopropyl betaine, hydroxyalkyl (C12-14) hydroxyethyl sarcosine, and alkyl (C12,14) oxyhydroxypropyl arginine HCl.

[0037] When the hair wash composition of the present embodiment contains an amphoteric surfactant other than the component (A), the total amount of amphoteric surfactants in the hair wash composition (the total amount of the component (A) and amphoteric surfactants other than the component (A)) is preferably 20 mass% or less, from the viewpoint of reducing the risk of skin irritation.

[0038] The hair wash composition of the present embodiment may not contain any amphoteric surfactant other than component (A).

[0039] (B) Cationic polymer The hair wash composition of the present embodiment contains one or more types of (B) cationic polymers.

[0040] Examples of component (B) include cationized cellulose (O-[2-hydroxy-3-(trimethylammonio)propyl] hydroxyethyl cellulose chloride (polyquaternium-10), polyquaternium-4, etc.), cationized guar gum (O-[2-hydroxy-3-(trimethylammonio)propyl] guar gum chloride, etc.), vinylpyrrolidone-N,N-dimethylaminoethyl methacrylic acid copolymer diethyl sulfate, polydimethylmethylene piperidinium chloride, and ionic polymers containing diallyl quaternary ammonium salt as a structural unit (dimethyldiallylammonium chloride-acrylamide copolymer (polyquaternium-7), dimethyldiallylammonium chloride). Examples of suitable cations include ammonium-acrylic acid copolymer (Polyquaternium-22), acrylamide-acrylic acid-dimethyldiallylammonium chloride copolymer (Polyquaternium-39), 2-methacryloyloxyethylphosphorylcholine-2-hydroxy-3-methacryloyloxypropyltrimethylammonium chloride copolymer (Polyquaternium-64), Polyquaternium-47, Polyquaternium-52, Polyquaternium-53, acrylic acid-acrylamide-methacrylamidopropyltrimonium chloride, cationized starch, and cationized polypeptides. These may be used alone or in combination. The above-listed cations, Polyquaternium-10, Polyquaternium-4, Polyquaternium-7, Polyquaternium-22, Polyquaternium-39, Polyquaternium-64, Polyquaternium-47, Polyquaternium-52, and Polyquaternium-53, are cosmetic labeling names.

[0041] The hair wash composition of this embodiment may contain, as component (B), one or more selected from polyquaternium-7, polyquaternium-10, polyquaternium-22, polyquaternium-39, polyquaternium-47, and polyquaternium-52. From the viewpoint of improving the smooth feeling when rinsing, the hair wash composition of this embodiment preferably uses polyquaternium-10 or polyquaternium-22 as component (B), and from the viewpoint of improving the smooth feeling when rinsing and further increasing the foam strength and foam retention, it is more preferable to use polyquaternium-10.

[0042] The blending amount of component (B) in the hair wash composition of this embodiment is, for example, 0.1% by mass or more, and from the viewpoint of improving the feel of hair after washing, it is preferably 0.2% by mass or more, and more preferably 0.3% by mass or more. Note that if the amount of component (B) in the hair wash composition is too large, the solubilizing effect in a solvent may be reduced, so the blending amount of component (B) in the hair wash composition of this embodiment is preferably 1.0% by mass or less, more preferably 0.8% by mass or less, and even more preferably 0.7% by mass or less.

[0043] (B) The amount of all amphoteric surfactants blended relative to the amount of component blended In the hair wash composition of this embodiment, when the amount of the component (B) is taken as 1 part by mass, the amount of all amphoteric surfactants (when only the component (A) is contained in the hair wash composition, this amount is that amount; when the component (A) and an amphoteric surfactant other than the component (A) are contained, this amount is the total amount of these; the same applies hereinafter) is at least 11 parts by mass, and preferably at least 12.5 parts by mass, from the viewpoint of good solubilization of the component (B). Hereinafter, the amount of all amphoteric surfactants when the amount of the component (B) is taken as 1 part by mass will be abbreviated as "AA / AC."

[0044] The upper limit of AA / AC in the hair wash composition of this embodiment is not particularly limited and can be set as appropriate, but may be, for example, 150 parts by mass or less, 100 parts by mass or less, or 50 parts by mass or less.

[0045] (C)Water The hair wash composition of the present embodiment contains water (C) as a solvent. The amount of water in the hair wash composition of the present embodiment is not particularly limited and may be appropriately set, but is, for example, 60% by mass or more and 90% by mass or less.

[0046] (D) Anionic surfactants The hair wash composition of the present embodiment does not contain (D) anionic surfactant, or contains (D) anionic surfactant in an amount of 5 mass % or less.

[0047] The amount of component (D) in the hair wash composition of this embodiment is 5% by mass or less, preferably 3% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less, still more preferably 0.3% by mass or less, and particularly preferably 0% by mass (i.e., no component (D) is added), from the viewpoint of reducing the fading effect of component (D) on dyed hair and the strength of skin cleansing properties.

[0048] When component (D) is incorporated into the hair wash composition of this embodiment, component (D) can be one or more of known anionic surfactants. Examples of component (D) include carboxylic acid anionic surfactants, sulfonic acid anionic surfactants, sulfate anionic surfactants, and phosphate anionic surfactants. Examples of component (D) include coconut oil fatty acid salts, polyoxyethylene alkyl ether acetates, N-acyl glutamates, N-acylaspartates, N-acylmethylalanine salts, fatty acid methyl taurines, alkyl sulfonates (e.g., tetradecene sulfonates), alkyl sulfates, polyoxyethylene alkyl ether sulfates, dialkyl phosphates, dialkenyl phosphates, polyoxyethylene alkyl ether phosphates, and polyoxyethylene alkenyl ether phosphates.

[0049] (E) Nonionic surfactant The hair wash composition of the present embodiment does not contain (E) a nonionic surfactant, or contains (E) a nonionic surfactant in an amount of 4 mass % or less.

[0050] The blending amount of component (E) in the hair wash composition of this embodiment is 4% by mass or less, preferably 3% by mass or less, and more preferably 2% by mass or less, from the viewpoint of suppressing the effect of component (E) in inhibiting the solubilization of the cationic polymer.

[0051] When the component (E) is blended into the hair wash composition of the present embodiment, one or more types of known nonionic surfactants can be used as the component (E). Examples of component (E) include alkyl alkanol-type nonionic surfactants (such as coconut oil fatty acid N-methylethanolamide, lauric acid diethanolamide, palm kernel oil fatty acid diethanolamide, stearic acid monoethanolamide, and lauric acid monoisopropanolamide), alkyl glucoside, polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbit fatty acid esters (such as polyoxyethylene sorbit tetraoleate), polyglycerin fatty acid esters, monoglycerides, diglycerides, polyethylene glycol derivatives of monoglycerides or diglycerides, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene polyoxypropylene alkylene ethers, polyoxyethylene alkyl ethers (such as polyoxyethylene cetyl ether), polyoxyethylene alkylene ethers (such as polyoxyethylene oleyl ether), polyoxypropylene alkyl ethers, polyoxypropylene alkylene ethers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene hydrogenated castor oil.

[0052] Compatible ingredients In addition to the above-mentioned components, the hair wash composition of this embodiment can also contain various components commonly used in hair cosmetics such as ordinary shampoos, if necessary. Examples of such components that can be added include acids, alkalis, preservatives, inorganic salts, oils (e.g., lanolin derivatives, liquid paraffin, higher fatty acids, higher alcohols, esters, silicone oils, etc.), thickeners other than component (B), conditioning agents, antioxidants and chelating agents for preventing discoloration and oxidation, antidandruff agents, disinfectants, ultraviolet absorbers, fragrances, and pearlizing agents.

[0053] The acid may be one or more of organic acids (e.g., citric acid, lactic acid, glycolic acid, malic acid, succinic acid) and inorganic acids (e.g., phosphoric acid). The amount of acid in the hair wash composition of this embodiment is, for example, 0.01% by mass or more and 2% by mass or less.

[0054] The alkali may be one or more of inorganic alkalis (e.g., potassium hydroxide, sodium hydroxide, ammonia) and organic alkalis (e.g., aminoethylpropanol, arginine, triethanolamine). The amount of alkali in the hair wash composition of this embodiment is, for example, 0.01% by mass or more and 2% by mass or less.

[0055] The pH of the hair wash composition of the present embodiment can be adjusted appropriately using an acid or alkali.

[0056] By incorporating a preservative into the hair wash composition of this embodiment, storage stability can be improved. As the preservative, a known preservative (e.g., benzoic acid or a salt thereof) incorporated into a typical hair cosmetic such as shampoo can be used. The amount of the preservative incorporated into the hair wash composition of this embodiment is, for example, 0.001% by mass or more and 1% by mass or less.

[0057] The hair wash composition of this embodiment may contain an inorganic salt, but if the amount of inorganic salt is relatively large, the solubilization of the cationic polymer may be inhibited depending on the composition of the hair wash composition. Therefore, the hair wash composition of this embodiment preferably does not contain an inorganic salt or contains an inorganic salt in an amount of less than 2% by mass. When the hair wash composition of this embodiment contains an inorganic salt, the amount of inorganic salt may be less than 1.0% by mass, less than 0.8% by mass, or less than 0.5% by mass.

[0058] The inorganic salt may be one or more of known inorganic salts commonly used in the field of cosmetics, such as sodium chloride, potassium chloride, magnesium chloride, magnesium sulfate, sodium phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate, aluminum sulfate, and aluminum potassium sulfate.

[0059] others The appearance of the hair wash composition of this embodiment is not particularly limited, and may be, for example, transparent (colorless transparent or colored transparent), opaque, or pearly. The term "transparent" refers to a state in which the hair wash composition of this embodiment is visible through a colorless transparent glass bottle when the hair wash composition of this embodiment is left standing at 25°C. The hair wash composition of this embodiment may be opaque or pearly because components other than the cationic polymer are dispersed in the water solvent rather than dissolved therein. Even when the hair wash composition of this embodiment is opaque or pearly, it still exhibits an excellent degree of solubilization of the cationic polymer due to the inclusion of at least the essential components of the hair wash composition of this embodiment (predetermined amounts of component (A), component (B), and component (C) are blended, the amounts of component (D) and component (E) are limited, and the total amount of amphoteric surfactants is 11 parts by mass or more when the amount of component (B) is 1 part by mass).

[0060] The absorbance of the hair wash composition of this embodiment is not particularly limited and can be set as appropriate. For example, the absorbance at a wavelength of 650 nm may be 1 or less, 0.6 or less, or 0.1 or less. The absorbance at a wavelength of 650 nm can be measured using a known absorbance measuring device (for example, the "MICROPLATE READER SH-9000 Lab" (product name) manufactured by Corona Electric Co., Ltd.). The hair wash composition of this embodiment is excellent at solubilizing component (B). Therefore, for example, if all components other than at least component (B) are dissolved in water as a solvent, the absorbance at a wavelength of 650 nm measured by the method described in the Examples below can be 0.6 or less.

[0061] The viscosity of the hair washing composition of this embodiment is not particularly limited and can be set appropriately. The viscoelasticity value, which is an index of viscosity of the hair washing composition of this embodiment, can be measured, for example, using a rheometer (for example, a stress-controlled rheometer "Rheo Stress 6000" (trade name) manufactured by HAAKE) under the conditions of a measurement temperature of 25°C, a diameter of a cone-plate sensor of 35 mm, an inclination angle of the cone-plate sensor of 2°, a steady flow curve mode, and a waiting time of 1 minute, at a shear rate of 36 s -1 The viscoelasticity measured by is 100 mPa·s or more and 30,000 mPa·s or less.

[0062] The formulation of the hair wash composition of the present embodiment is not particularly limited, and examples thereof include a liquid, a paste, etc. When the hair wash composition of the present embodiment is prepared into a liquid formulation, the viscoelasticity measured with a rheometer under the measurement conditions described above is, for example, 30,000 mPa s or less.

[0063] The pH of the hair wash composition of the present embodiment at 25° C. is not particularly limited, but is, for example, 3.0 or more and 7.0 or less.

[0064] The product form of the hair wash composition of the present embodiment is not particularly limited, but examples thereof include hair shampoo.

[0065] The hair washing composition of the present embodiment can be produced by employing a known method for producing a hair washing composition according to the formulation.

[0066] The hair wash composition of the present embodiment is used for hair washing, and may be used for hair and scalp washing. Furthermore, the hair wash composition of the present embodiment may be used for hair that has been dyed with an oxidative hair dye, or may be used for hair that has not been dyed with an oxidative hair dye.

[0067] <How to wash your hair> The washing method of this embodiment uses the hair wash composition of this embodiment described above. The washing method of this embodiment can be used to wash hair and to wash hair and scalp in the same manner as hair wash compositions such as ordinary shampoos (shampoos used to wash wet hair). [Example]

[0068] The present invention will be described in detail below based on examples. However, the following examples do not limit the present invention. In Tables 1 to 5 below, the amount of each component is shown in % so that the total amount of the hair wash composition is 100%, but all of these % are mass %. Furthermore, in these tables, the % indication is omitted and only the numerical value indicating the amount is shown. Furthermore, in Tables 1 to 5, the unit "parts by mass" is omitted for AA / AC as well.

[0069] Examples 1 to 11, Comparative Examples 1 to 5, and Reference Examples 1 to 4 The hair wash compositions (liquid formulations) of Examples 1 to 11, Comparative Examples 1 to 5, and Reference Examples 1 to 4 were prepared by mixing lauryl betaine, lauramidopropyl betaine, cocamidopropyl betaine, sodium cocoamphoacetate, lauramidopropyl hydroxysultaine, lauryl hydroxysultaine, sodium lauraminopropionate, and lauramine oxide (all of which are component (A)); hydroxyalkyl (C12-14) hydroxyethyl sarcosine, isostearamidopropyl betaine, and alkyl (C12,14) oxyhydroxypropyl arginine HCl (all of which are amphoteric surfactants other than component (A)); polyquaternium-10 (component (B)); sodium laureth sulfate (component (D)); coconut oil fatty acid N-methylethanolamide (component (E)); sodium chloride; citric acid; fragrance; and purified water in a conventional manner to obtain the compositions shown in Tables 1 to 5.

[0070] Then, for each of the hair wash compositions of the Examples, Comparative Examples and Reference Examples, the degree of solubilization of component (B) was evaluated by the following absorbance measurement.

[0071] <Transparency assessment> The hair wash compositions of Examples 1 to 11, Comparative Examples 1 to 5, and Reference Examples 1 to 4, which are excellent at solubilizing component (B), are visually transparent, e.g., have low absorbance at a wavelength of 650 nm. Those that are poor at solubilizing component (B) are visually turbid and have high absorbance at a wavelength of 650 nm. Each hair wash composition was placed in a polystyrene cell with a 10 mm optical path length and measured using a "MICROPLATE READER SH-9000 Lab" (product name) manufactured by Corona Electric Co., Ltd. The transparency of each hair wash composition was then evaluated according to the following criteria. The evaluation results are shown in Tables 1 to 5.

[0072] (Evaluation Criteria for Transparency of Hair Washing Composition) ○: The absorbance at a wavelength of 650 nm is 1 or less. ×: The absorbance at a wavelength of 650 nm exceeds 1.

[0073] In Tables 1 to 5, the phrase "total 100" in the "purified water" column means that the amount of purified water was added to the total amount of each component other than purified water blended into the hair wash composition to make it 100%. In Tables 4 and 5, "pH" is a value measured at 25°C, and the "appropriate amount" in the "citric acid" column means the amount that makes the pH of the hair wash composition 6.0.

[0074] [Table 1]

[0075] [Table 2]

[0076] [Table 3]

[0077] [Table 4]

[0078] [Table 5]

[0079] Table 1 shows the evaluation results of hair wash compositions of Reference Examples 1 to 3, which did not contain the amphoteric surfactant (component (A)) but varied the amount of anionic surfactant (D). The hair wash composition of Reference Example 1, which contained a high amount of component (D) at 10.0% by mass, had low absorbance at 650 nm, high transparency, and good solubilization of the cationic polymer (B). However, the hair wash compositions of Reference Examples 2 and 3, which contained reduced amounts of component (D) to 5.0% and 2.0% by mass, respectively, had high absorbance at 650 nm, were visually confirmed to be cloudy, and did not fully solubilize component (B). These results demonstrate that reducing the amount of anionic surfactant tends to result in poorer solubilization of the cationic polymer.

[0080] On the other hand, as shown in Tables 2 and 3, the hair wash compositions of Examples 1 to 8, which contained 4% or more by mass of component (A), 0.1% or more by mass of component (B), 4% or less by mass of nonionic surfactant (E), and 11 parts by mass or more of AA / AC, had low absorbance at a wavelength of 650 nm and were visually confirmed to be transparent, despite not containing component (D). In contrast, the hair wash compositions of Comparative Examples 1 to 3, which contained an amphoteric surfactant other than component (A) instead of component (A), had high absorbance at a wavelength of 650 nm and were visually confirmed to be cloudy, indicating that component (B) was not sufficiently solubilized.

[0081] Table 4 shows the evaluation results of the hair wash compositions of Comparative Example 4 and Examples 9 and 10, in which the amount of component (A) was varied to change the AA / AC ratio, along with the evaluation result of Reference Example 4, which did not contain component (B). The hair wash composition of Reference Example 4, which did not contain component (B), had low absorbance at a wavelength of 650 nm and was visually confirmed to be transparent. However, the hair wash composition of Comparative Example 4, which had the same composition as Reference Example 4 except for the inclusion of component (B), but contained a lower amount of component (A) and a lower AA / AC ratio, had high absorbance at a wavelength of 650 nm and was visually confirmed to be cloudy, indicating that component (B) was not sufficiently solubilized. In contrast, the hair wash compositions of Examples 9 and 10, which contained a higher amount of component (A) than the hair wash composition of Comparative Example 4 (4 mass % or more) and an AA / AC ratio of 11 mass % or more, had low absorbance at a wavelength of 650 nm and were visually confirmed to be transparent, indicating that component (B) was well solubilized.

[0082] Photographs of samples of the hair wash compositions of Example 9 and Comparative Example 4 (placed in a cylindrical glass container with a diameter of 40 mm (product number SV-100 (colorless) bottle, manufactured by Nichiden Rika Glass Co., Ltd.)) are shown in Figures 1 and 2, respectively. These photographs were taken against a background of paper with a black line extending horizontally in the figure. In the photograph of the hair wash composition of Example 9 shown in Figure 1, the black line in the background can be seen, indicating high transparency and good solubilization of component (B). In contrast, in the photograph of the hair wash composition of Comparative Example 4 shown in Figure 2, the composition is cloudy and the black line in the background cannot be seen, indicating insufficient solubilization of component (B).

[0083] Table 5 also shows the evaluation results of hair wash compositions of Example 11 and Comparative Example 5, which had the same composition except for the amount of nonionic surfactant (E). The hair wash composition of Example 11, in which the amount of component (E) was 4% by mass or less, had low absorbance at a wavelength of 650 nm and was visually confirmed to be transparent, demonstrating good solubilization of component (B). In contrast, the hair wash composition of Comparative Example 5, in which the amount of component (E) was 5.0% by mass, had high absorbance at a wavelength of 650 nm and was visually confirmed to be cloudy, indicating insufficient solubilization of component (B). These results demonstrate that component (E) has the effect of impairing the solubilization of component (B), but limiting its amount to a certain value or less can suppress this decrease in the solubility of component (B).

Claims

1. (A) at least one amphoteric surfactant selected from the group consisting of alkyldimethylaminoacetic acid betaine, alkylamidopropyl betaine having a hydrocarbon group having from 8 to 16 carbon atoms, imidazolium betaine, alkylamidopropyl hydroxysultaine, alkylhydroxysultaine, alkylaminopropionic acid or a salt thereof, and alkylamine oxide; (B) a cationic polymer, and (C) Water is blended, The blending amount of the (A) component is 4% by mass or more, and the blending amount of the (B) component is 0.1% by mass or more, (D) Anionic surfactant is not blended, or (D) Anionic surfactant is blended in an amount of 5 mass% or less, (E) The nonionic surfactant is not blended, or (E) The nonionic surfactant is blended in an amount of 4 mass% or less, A hair wash composition in which the total amount of amphoteric surfactants is 11 parts by mass or more when the amount of component (B) is 1 part by mass.

2. 2. The hair wash composition according to claim 1, wherein the blending amount of component (A) is 20% by mass or less.

3. 2. The hair wash composition according to claim 1, wherein the blending amount of component (B) is 1.0% by mass or less.

4. 2. The hair washing composition according to claim 1, which has an absorbance of 1 or less at a wavelength of 650 nm.

5. A method for washing hair using the hair washing composition according to any one of claims 1 to 4.

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