Gel-type hair cleanser

Abstract

To provide a gel-type hair cleanser which can realize a highly viscous gel-like state, has excellent foaming properties and usability, and has good storage stability at high temperatures. [Solution] The gel-type hair wash contains (A) an acylmethyl taurine salt and an acylmethyl alanine salt, (B) at least one selected from alkylamidopropyl betaine and imidazolinium betaine, (C) 1.0% to 3% by mass of polyoxyethylene methyl glucoside dioleate, and (D) at least one selected from an acrylic polymer and a reaction product of adipic acid, acetic anhydride, and corn starch, wherein the total content of components (A) and (B) is 10% to 25% by mass, the mass ratio of components (A) to (B) [(A) / (B)] is 0.3 to 0.9, and the viscosity at 25°C is 6,000 mPa·s or more.

Description

[Technical Field]

[0001] The present invention relates to a gel-type hair wash. [Background technology]

[0002] Shampoos generally contain sulfate-based anionic surfactants such as sodium lauryl ether sulfate (LES) and amphoteric surfactants such as cocamidopropyl betaine as cleansing ingredients, and also contain table salt or the like as a viscosity adjuster.

[0003] In recent years, amino acid-based surfactants such as N-acyl-N-alkylglycine salts have been used instead of LES. However, since it is difficult to thicken amino acid-based surfactants, viscosity adjusters such as acrylic polymers are added to achieve a gel-like texture and high viscosity. Furthermore, a skin cleanser composition containing polyoxyethylene methyl glucoside dioleate as a thickener has been proposed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6181309 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, adding a viscosity modifier such as an acrylic polymer to an amino acid-based surfactant can impart a characteristic texture and high viscosity, but there is a problem in that the hair becomes squeaky during use. Furthermore, in Patent Document 1, the content of polyoxyethylene methyl glucoside dioleate is as low as 0.02% by mass to 0.1% by mass, making it difficult to impart a gel-like texture or high viscosity.

[0006] The present invention aims to solve the above-mentioned problems of the prior art and to achieve the following objectives: Namely, the present invention aims to provide a gel-type hair wash that can achieve a highly viscous gel-like state, has excellent foaming properties and ease of use, and has good storage stability at high temperatures (approximately 50°C). [Means for solving the problem]

[0007] As a result of intensive research by the present inventors to achieve the above-mentioned object, it was discovered that a gel-type hair wash containing (A) an acylmethyl taurine salt and an acylmethyl alanine salt, (B) at least one selected from alkylamidopropyl betaine and imidazolinium betaine, (C) polyoxyethylene methyl glucoside dioleate, and (D) at least one selected from an acrylic polymer, and a reaction product of adipic acid, acetic anhydride, and corn starch, wherein the total content of components (A) and (B) is 10% by mass to 25% by mass and the mass ratio of components (A) to (B) [(A) / (B)] is 0.3 to 0.9, can achieve a highly viscous gel-like state, has excellent foaming properties and ease of use, and exhibits good storage stability at high temperatures, which led to the completion of the present invention.

[0008] The present invention is based on the above findings of the present inventors, and the means for solving the above problems are as follows.

[0009] The gel hair wash of the present invention contains (A) an acylmethyl taurine salt and an acylmethyl alanine salt, (B) at least one selected from alkylamidopropyl betaine and imidazolinium betaine, (C) 1.0% by mass to 3% by mass of polyoxyethylene methyl glucoside dioleate, and (D) at least one selected from an acrylic polymer and a reaction product of adipic acid, acetic anhydride, and corn starch, the mass ratio of the acylmethyltaurine salt (A1) to the acylmethylalanine salt (A2) [(A1) / (A2)] is 0.2 to 2; the total content of component (A) and component (B) is 10% by mass to 25% by mass, and the mass ratio of component (A) to component (B) [(A) / (B)] is 0.3 to 0.9; pH is 7 or less, The viscosity at 25°C is 6,000 mPa·s or more.

[0010] The gel-type hair wash has a mass ratio of the acylmethyl taurine salt (A1) to the acylmethyl alanine salt (A2) [(A1) / (A2)] of 0.2 to 1.0. 1 It is preferable that: In addition, the gel-type hair wash preferably contains component (B) containing at least one selected from cocamidopropyl betaine and sodium lauroamphoacetate. In addition, the gel-type hair wash preferably contains PEG120 methyl glucose dioleate as component (C). In addition, the gel-type hair wash preferably contains component (D) at least one selected from acrylate copolymers and starch (acetate / adipate). The gel-type hair wash preferably contains component (D) in an amount of 0.1% to 1.2% by mass.

[0011] The gel-type hair wash preferably further contains (E) a cationic polymer. In addition, the gel-type hair wash has a pH 2.5~ Preferably it is 7.

[0012] The gel-type hair wash is preferably used in a shampoo or an all-in-one shampoo. [Effects of the Invention]

[0013] According to the present invention, the above-mentioned conventional problems can be solved, the above-mentioned object can be achieved, and a gel-type hair wash can be provided which is highly viscous, has excellent foaming properties and usability, and has good storage stability at high temperatures. DETAILED DESCRIPTION OF THE INVENTION

[0014] The gel hair wash of the present invention contains (A) an acylmethyl taurine salt and an acylmethyl alanine salt, (B) at least one selected from alkylamidopropyl betaine and imidazolinium betaine, (C) polyoxyethylene methyl glucoside dioleate, and (D) at least one selected from an acrylic polymer and a reaction product of adipic acid, acetic anhydride, and corn starch, and may further contain other ingredients as necessary.

[0015] In the present invention, the term "gel-like" refers to a semi-solid state having fluidity, and has a viscosity at 25°C of 6,000 mPa·s or more, preferably 8,000 mPa·s or more, more preferably 10,000 mPa·s or more, and even more preferably 15,000 mPa·s or more. From the viewpoint of handleability, the upper limit of the viscosity at 25°C is preferably 30,000 mPa·s or less. The viscosity is a value measured at 25°C using a Brookfield viscometer in accordance with the viscosity measurement method described in the general testing methods of the 17th edition of the Japanese Pharmacopoeia.

[0016] <(A) Acylmethyltaurine salts and acylmethylalanine salts> -(A1) Acylmethyltaurine salt- The acylmethyl taurine salt of component (A1) is an anionic surfactant, a salt in which an acyl group and a methyl group are bonded to the amino group of taurine (2-aminoethyl-1-sulfonic acid). The acyl group is not particularly limited, but is preferably a fatty acid residue having 8 to 22 carbon atoms, and examples thereof include a single acyl group such as lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, or oleic acid; an acyl group derived from coconut oil fatty acid, beef tallow fatty acid, castor oil fatty acid, olive oil fatty acid, or palm oil fatty acid; or a mixture thereof.

[0017] Examples of the acylmethylalanine salt include alkali metal salts such as sodium salt and potassium salt, amine salts such as monoethanolamine salt, diethanolamine salt and triethanolamine salt, triethanolamine salt, etc. Among these, sodium salt and potassium salt are preferred. Examples of the acyl methyl taurine salt of component (A) include sodium lauroyl methyl taurine, sodium myristoyl methyl taurine, sodium palmitoyl methyl taurine, sodium stearoyl methyl taurine, sodium tallow fatty acid methyl taurine, sodium coconut oil fatty acid methyl taurine (sodium cocoyl methyl taurine), sodium decanoyl methyl taurine, etc. These may be used alone or in combination of two or more. Among these, sodium cocoyl methyl taurine is preferred.

[0018] -(A2) Acylmethylalanine salt- The acylmethylalanine salt of component (A2) is an anionic surfactant, and is an amide salt of an acyl group and methylalanine. The acyl group is not particularly limited, but is preferably a fatty acid residue having 8 to 22 carbon atoms, and examples thereof include a single acyl group such as lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, or oleic acid; an acyl group derived from coconut oil fatty acid, beef tallow fatty acid, castor oil fatty acid, olive oil fatty acid, or palm oil fatty acid; or a mixture thereof.

[0019] Examples of the acylmethylalanine salt include alkali metal salts such as sodium salt and potassium salt, amine salts such as monoethanolamine salt, diethanolamine salt and triethanolamine salt, triethanolamine salt, etc. Among these, sodium salt and potassium salt are preferred. Examples of the acylmethylalanine salt of component (A) include sodium lauroylmethylalanine, triethanolamine lauroylmethylalanine, sodium myristoylmethylalanine, and sodium coconut oil fatty acid methylalanine (sodium cocoylmethylalanine). These may be used alone or in combination of two or more. Among these, sodium lauroylmethylalanine is preferred.

[0020] The total content of the acylmethyl taurine salt and acylmethyl alanine salt of component (A) is preferably 1% by mass to 15% by mass, more preferably 1% by mass to 10% by mass, and even more preferably 3% by mass to 10% by mass, based on the total amount of the gel hair wash. The mass ratio [(A1) / (A2)] of the acylmethyl taurine salt (A1) to the acylmethyl alanine salt (A2) is preferably 0.2 to 2, more preferably 0.2 to 1. When the mass ratio [(A1) / (A2)] is 0.2 to 2, a high viscosity range of the gel hair wash can be achieved.

[0021] <(B) At least one selected from alkylamidopropyl betaine and imidazolinium betaine> The at least one member selected from alkylamidopropyl betaine and imidazolinium betaine of component (B) may be used alone or in combination of two or more members.

[0022] -(B1) Alkylamidopropyl betaine- The alkylamidopropyl betaine of component (B1) is an amphoteric surfactant, and examples thereof include coconut oil fatty acid amidopropyl betaine (cocamidopropyl betaine), palm kernel oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, myristate acid amidopropyl betaine (myristamidopropyl betaine), cocamidopropyl betaine, and undecylenamidopropyl betaine. These may be used alone or in combination of two or more. Among these, coconut oil fatty acid amidopropyl betaine (cocamidopropyl betaine) is preferred.

[0023] -(B2) Imidazolinium betaine- The imidazolinium betaine of component (B2) is an amphoteric surfactant, and examples thereof include 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine (sodium cocoamphoacetate), N-lauroyl-N'-carboxymethyl-N'-hydroxyethyl ethylenediamine sodium (sodium lauroamphoacetate), coconut oil alkyl-N-hydroxyethyl imidazolinium betaine, 2-undecyl-N,N,N-(hydroxyethyl carboxymethyl)-2-imidazoline sodium, 2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, and 2-heptadecyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine. These may be used alone or in combination of two or more. Among these, N-lauroyl-N'-carboxymethyl-N'-hydroxyethyl ethylenediamine sodium (sodium lauroamphoacetate) is preferred.

[0024] The content of at least one selected from alkylamidopropyl betaine and imidazolinium betaine as component (B) is preferably 1% by mass to 15% by mass, more preferably 1% by mass to 10% by mass, and even more preferably 3% by mass to 10% by mass, relative to the total amount of the gel hair wash.

[0025] The total content of components (A) and (B) is 10% to 25% by mass, preferably 10% to 20% by mass, and more preferably 15% to 20% by mass. When the total content of components (A) and (B) is 10% to 25% by mass, foaming properties are improved and a high viscosity range of the gel hair wash can be achieved.

[0026] The mass ratio of component (A) to component (B) [(A) / (B)] is 0.3 to 0.9, preferably 0.3 to 0.7, and more preferably 0.5 to 0.7. When the mass ratio [(A) / (B)] is 0.3 to 0.9, a high viscosity range of the gel hair wash can be achieved.

[0027] <(C) Polyoxyethylene methyl glucoside dioleate> Component (C), polyoxyethylene methyl glucoside dioleate, is a polyethylene glycol ether formed from a diester of oleic acid and methyl glucose. Examples of polyoxyethylene methyl glucoside dioleate of component (C) include PEG-120 methylglucuronide dioleate, etc. PEG-120 methyl glucose dioleate is a labeling name designated by the Japan Cosmetic Industry Association.

[0028] The content of polyoxyethylene methyl glucoside dioleate of component (C) is 0.5 to 3 mass %, preferably 1 to 3 mass %, and more preferably 1 to 2 mass %, based on the total amount of the gel hair wash. When the content of polyoxyethylene methyl glucoside dioleate is 0.5 to 3 mass %, an excellent viscosity-increasing effect can be obtained.

[0029] <(D) At least one selected from acrylic polymers and reaction products of adipic acid, acetic anhydride, and corn starch> The at least one member selected from the group consisting of acrylic polymers and reaction products of adipic acid, acetic anhydride and corn starch as component (D) may be used alone or in combination of two or more. The gel-type hair wash of the present invention has improved high-temperature storage stability and an excellent viscosity-increasing effect due to the combined blending of component (C), polyoxyethylene methyl glucoside dioleate, and component (D), at least one selected from an acrylic polymer and a reaction product of acetic anhydride and corn starch.

[0030] The acrylic polymer is preferably a copolymer of two or more constituent monomers selected from the group consisting of acrylic acid, methacrylic acid, acrylic acid (C1-C4) alkylate, and methacrylic acid (C1-C4) alkylate. In the present invention, an acrylic copolymer or methacrylic copolymer that is a random copolymer, an alternating copolymer, or a block copolymer can be used. Examples of acrylic polymers include compounds that are referred to as "ACRYLATES COPOLYMER" in the INCI name (International Cosmetic Ingredient Dictionary and Handbook, 14th Edition, Vol. 1, CTFA, 2012, pp. 60-61).

[0031] Examples of reaction products of adipic acid and acetic anhydride with corn starch include (acetate / adipate) starch (labeled name in cosmetics).

[0032] The content of at least one selected from the group consisting of acrylic polymers and reaction products of adipic acid, acetic anhydride, and cornstarch as component (D) is preferably 0.1 to 1.2% by mass, more preferably 0.2 to 1.0% by mass, and even more preferably 0.3 to 0.9% by mass, based on the total amount of the gel hair wash. When the content of component (D) is 0.1 to 1% by mass, high-temperature storage stability is improved and an excellent viscosity-increasing effect is obtained.

[0033] In addition to the above components (A) to (D), the gel-type hair wash of the present invention preferably further contains (E) a cationic polymer and (F) a silicone emulsion, if necessary.

[0034] <(E) Cationic Polymer> Examples of cationic polymers for component (E) include O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethyl cellulose chloride (cationized cellulose; polyquaternium-10), O-[2-hydroxy-3-(trimethylammonio)propyl]guar gum chloride (cationized guar gum; guar hydroxypropyltrimonium chloride), dimethyldiallylammonium chloride-acrylamide copolymer (polyquaternium-7), cationized tamarind gum, cationized fenugreek gum, cationized tara gum, cationized locust bean gum, vinylpyrrolidone / quaternized dimethylaminoethyl methacrylate copolymer, and polyvinylpyrrolidone / alkylaminoacrylate copolymer. These may be used alone or in combination of two or more.

[0035] The content of the cationic polymer as component (E) is preferably from 0.1 to 10% by mass, more preferably from 0.3 to 5% by mass, based on the total amount of the gel hair wash.

[0036] <(F) Silicone emulsion> component The silicone emulsion (F) refers to a water-emulsified silicone emulsion in which silicones are emulsified with water using a surfactant. There are no particular restrictions on the silicone content in this silicone emulsion, but from the perspective of ease of availability, it is preferably 35 to 60 mass % in the emulsion. Examples of silicone emulsions include those obtained by emulsifying dimethylpolysiloxane with a surfactant, those obtained by mixing high-viscosity dimethylpolysiloxane and low-viscosity dimethylpolysiloxane, decamethylcyclopentasiloxane or light liquid paraffin and emulsifying the mixture with water, those obtained by emulsifying high-polymerization methylpolysiloxane and low-viscosity methylpolysiloxane with a surfactant, and those obtained by emulsifying high-polymerization methylpolysiloxane and low-viscosity methylpolysiloxane with a surfactant in the presence of a polyhydric alcohol.

[0037] The content of the silicone emulsion of component (F) is preferably 0.1 to 5% by mass, and more preferably 0.1 to 3% by mass, based on the total amount of the gel hair wash.

[0038] <Other ingredients> The gel-type hair wash of the present invention may contain other ingredients as long as the effects of the present invention are not impaired. Other ingredients include, for example, water, cationic surfactants, nonionic surfactants, moisturizers, water-soluble polymers, film-forming agents, ultraviolet absorbers, sequestering agents, lower alcohols, polyhydric alcohols, oils, sugars, amino acids, organic amines, polymer emulsions, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant aids, hair growth ingredients, fragrances, colorants, preservatives, etc., which may be appropriately blended as needed to produce a formulation according to the desired dosage form.

[0039] As the water, water used in cosmetics, quasi-drugs, etc. can be used, and examples thereof include ion-exchanged water, ultrafiltered water, reverse osmosis water, distilled water, purified water, pure water, ultrapure water, and tap water.

[0040] Examples of cationic surfactants include alkyltrimethylammonium salts (e.g., stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, etc.); alkylpyridinium salts (e.g., cetylpyridinium chloride, etc.); distearyldimethylammonium chloride, dialkyldimethylammonium salts; poly(N,N'-dimethyl-3,5-methylenepiperidinium chloride); alkyl quaternary ammonium salts; alkyldimethylbenzylammonium salts; alkylisoquinolinium salts; dialkylmorphonium salts; POE-alkylamines; alkylamine salts; polyamine fatty acid derivatives; amyl alcohol fatty acid derivatives; benzalkonium chloride; benzethonium chloride, etc.

[0041] Examples of lipophilic nonionic surfactants include sorbitan fatty acid esters (e.g., sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, diglycerol sorbitan penta-2-ethylhexylate, diglycerol sorbitan tetra-2-ethylhexylate, etc.); glycerin polyglycerin fatty acids (e.g., glycerin monocottonseed oil fatty acid, glycerin monoerucate, glycerin sesquioleate, glycerin monostearate, α,α'-oleic acid pyroglutamic acid glycerin, glycerin monostearate, Ng et al. ); propylene glycol fatty acid esters (for example, propylene glycol monostearate, etc.); hydrogenated castor oil derivatives; glycerin alkyl ethers, etc.

[0042] Examples of hydrophilic nonionic surfactants include POE-sorbitan fatty acid esters (e.g., POE-sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan monooleate, POE-sorbitan tetraoleate, etc.); POE-sorbitol fatty acid esters (e.g., POE-sorbitol monolaurate, POE-sorbitol monooleate, POE-sorbitol pentaoleate, POE-sorbitol monostearate, etc.); POE-glycerin fatty acid esters (e.g., POE-glycerin monostearate, POE-monooleates such as POE-glycerol monoisostearate, POE-glycerol triisostearate, etc.; POE-fatty acid esters (e.g., POE-distearate, POE-monodioleate, ethylene glycol distearate, etc.); POE-alkyl ethers (e.g., POE-lauryl ether, POE-oleyl ether, POE-stearyl ether, POE-behenyl ether, POE-2-octyldodecyl ether, POE-cholestanol ether, etc.); Pluronic (registered trademark) products; POE·POP- Alkyl ethers (e.g., POE·POP-cetyl ether, POE·POP-2-decyltetradecyl ether, POE·POP-monobutyl ether, POE·POP-hydrogenated lanolin, POE·POP-glycerin ether, etc.); tetraPOE·tetraPOP-ethylenediamine condensates (e.g., Tetronic, etc.); POE-hydrogenated castor oil derivatives (e.g., POE-castor oil, POE-hydrogenated castor oil, POE-hydrogenated castor oil monoisostearate, POE-hydrogenated castor oil triisostearate, POE-hydrogenated castor oil monopyrogulant, etc.) POE-hydrogenated castor oil with maleic acid, etc.); POE-beeswax and lanolin derivatives (e.g., POE-sorbitol beeswax, etc.); alkanolamides (e.g., coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, fatty acid isopropanolamide, cocamide methyl monoethanolamide, etc.); POE-propylene glycol fatty acid esters; POE-alkylamines; POE-fatty acid amides; diethylene glycol laurate; sucrose fatty acid esters; alkylethoxydimethylamine oxide;Trioleyl phosphate, etc.;

[0043] Examples of moisturizing agents include polyethylene glycol, propylene glycol, dipropylene glycol, glycerin, 1,3-butylene glycol, xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucoitin sulfate, caronic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile salts, dl-pyrrolidone carboxylate, alkylene oxide derivatives, short-chain soluble collagen, diglycerin (EO)PO adduct, Rosa illustrator extract, yarrow extract, and melilot extract.

[0044] Examples of natural water-soluble polymers include plant-derived polymers (e.g., gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed (marmella), algae colloid (cassowia extract), starch (e.g., rice, corn, potato, wheat), glycyrrhizic acid, etc.); microbial-derived polymers (e.g., xanthan gum, dextran, succinoglucan, pullulan, etc.); and animal-derived polymers (e.g., collagen, casein, albumin, gelatin, etc.).

[0045] Examples of semi-synthetic water-soluble polymers include starch-based polymers (e.g., carboxymethyl starch, methylhydroxypropyl starch, etc.); cellulose-based polymers (methyl cellulose, ethyl cellulose, methylhydroxypropyl cellulose, hydroxyethyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, crystalline cellulose, cellulose powder, etc.); and alginic acid-based polymers (e.g., sodium alginate, propylene glycol alginate, etc.).

[0046] Examples of synthetic water-soluble polymers include vinyl polymers (e.g., polyvinyl alcohol, polyvinyl methyl ether, polyvinylpyrrolidone, carboxyvinyl polymer, etc.); polyoxyethylene polymers (e.g., polyethylene glycol 20,000, 40,000, 60,0000 polyoxyethylene polypropylene copolymers, highly polymerized polyethylene glycol, etc.); acrylic polymers (e.g., sodium polyacrylate, polyethyl acrylate, polyacrylamide, etc.); polyethyleneimine; cationic polymers, etc.

[0047] Examples of the ultraviolet absorber include benzoic acid-based ultraviolet absorbers (e.g., para-aminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerin ester, N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA ethyl ester, N,N-dimethyl PABA butyl ester, N,N-dimethyl PABA ethyl ester, etc.); anthranilic acid-based ultraviolet absorbers (e.g., homomenthyl-N -acetyl anthranilate, etc.); salicylic acid-based ultraviolet absorbers (e.g., amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, etc.); cinnamic acid-based ultraviolet absorbers (e.g., octyl methoxycinnamate, ethyl 4-isopropyl cinnamate, methyl 2,5-diisopropyl cinnamate, ethyl 2,4-diisopropyl cinnamate, methyl 2,4 -Diisopropyl cinnamate, propyl-p-methoxycinnamate, isopropyl-p-methoxycinnamate, isoamyl-p-methoxycinnamate, octyl-p-methoxycinnamate (2-ethylhexyl-p-methoxycinnamate), 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexyl xanoyl-di-para-methoxycinnamate, etc.); benzophenone-based ultraviolet absorbers (e.g., 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-Phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone, etc.; 3-(4'-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor; 2-phenyl-5-methylbenzoxazole; 2,2'-hydroxy-5-methylphenylbenzotriazole; 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole; 2-(2'-hydroxy-5'-methylphenylbenzotriazole; dibenzalazine; dianisoylmethane; 4-methoxy-4'-t-butyldibenzoylmethane;Examples include 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, dimorpholinopyridazino; 2-ethylhexyl-2-cyano-3,3-diphenylacrylate; 2,4-bis-{[4-(2-ethylhexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-(1,3,5)-triazine;

[0048] Examples of sequestering agents include 1-hydroxyethane-1,1-diphosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid tetrasodium salt, edetate disodium, edetate trisodium, edetate tetrasodium, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetic acid, and ethylenediaminehydroxyethyltriacetate trisodium salt.

[0049] Examples of lower alcohols include ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol.

[0050] Examples of polyhydric alcohols include dihydric alcohols (e.g., ethylene glycol, propylene glycol, trimethylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, tetramethylene glycol, 2,3-butylene glycol, pentamethylene glycol, 2-butene-1,4-diol, hexylene glycol, octylene glycol, etc.); trihydric alcohols (e.g., glycerin, trimethylolpropane, etc.); tetrahydric alcohols (e.g., pentaerythritol such as 1,2,6-hexanetriol, etc.); pentahydric alcohols (e.g., xylitol, etc.); hexahydric alcohols (e.g., sorbitol, mannitol, etc.); polyhydric alcohol polymers (e.g., diethylene glycol, dipropylene glycol, triethylene glycol, polypropylene glycol, tetraethylene glycol, diglycerin, polyethylene glycol, triglycerin, tetra Glycerin, polyglycerin, etc.); dihydric alcohol alkyl ethers (e.g., ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monophenyl ether, ethylene glycol monohexyl ether, ethylene glycol mono-2-methylhexyl ether, ethylene glycol isoamyl ether, ethylene glycol benzyl ether, ethylene glycol isopropyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, etc.); dihydric alcohol alkyl ethers (e.g., diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol butyl ether, diethylene glycol methyl ethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol Monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, propylene glycol isopropyl ether, dipropylene glycol methyl ether, dipropylene glycol ethyl ether, dipropylene glycol butyl ether, etc.; dihydric alcohol ether esters (e.g., ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monophenyl ether acetate, ethylene glycol diadipate, ethylene glycol disuccinate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, propylene glycol monophenyl ether acetate, etc.); glycerin monoalkyl ethers (e.g., xyl alcohol, selachyl alcohol, batyl alcohol, etc.);Sugar alcohols (e.g., sorbitol, maltitol, maltotriose, mannitol, sucrose, erythritol, glucose, fructose, starch-degraded sugars, maltose, xylitose, starch-degraded sugar reducing alcohols, etc.); glysolids; tetrahydrofurfuryl alcohol; POE-tetrahydrofurfuryl alcohol; POP-butyl ether; POP·POE-butyl ether; tripolyoxypropylene glycerin ether; POP-glycerin ether; POP-glycerin ether phosphate; POP·POE-pentaneerythritol ether, polyglycerin, etc.;

[0051] Examples of monosaccharides include trioses (e.g., D-glyceryl aldehyde, dihydroxyacetone, etc.); tetraoses (e.g., D-erythrose, D-erythrulose, D-threose, erythritol, etc.); pentoses (e.g., L-arabinose, D-xylose, L-lyxose, D-arabinose, D-ribose, D-ribulose, D-xylulose, L-xylulose, etc.); hexoses (e.g., D-glucose, D-talose, D-busicose, D-galactose, D-fructose, L-galactose, L- mannose, D-tagatose, etc.); heptoses (e.g., aldoheptose, heptose, etc.); octooses (e.g., octulose, etc.); deoxysugars (e.g., 2-deoxy-D-ribose, 6-deoxy-L-galactose, 6-deoxy-L-mannose, etc.); aminosugars (e.g., D-glucosamine, D-galactosamine, sialic acid, aminouronic acid, muramic acid, etc.); uronic acids (e.g., D-glucuronic acid, D-mannuronic acid, L-guluronic acid, D-galacturonic acid, L-iduronic acid, etc.).

[0052] Examples of oligosaccharides include sucrose, guanthianose, umbelliferose, lactose, planteose, isolychnoses, α,α-trehalose, raffinose, lychnoses, umbilicin, stachyose, and verbascoses.

[0053] Examples of polysaccharides include cellulose, quince seed, chondroitin sulfate, starch, galactan, dermatan sulfate, glycogen, gum arabic, heparan sulfate, hyaluronic acid, tragacanth gum, keratan sulfate, chondroitin, mucoitin sulfate, dextran, keratosulfate, locust bean gum, succinoglucan, and caronic acid.

[0054] Examples of amino acids include neutral amino acids (e.g., threonine, cysteine, etc.), basic amino acids (e.g., hydroxylysine, etc.), etc. Furthermore, examples of amino acid derivatives include sodium acyl sarcosinate (e.g., sodium lauroyl sarcosinate), acyl glutamate, sodium acyl β-alanine, glutathione, pyrrolidone carboxylic acid, etc.

[0055] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol. Examples of polymer emulsions include acrylic resin emulsion, polyethyl acrylate emulsion, acrylic resin liquid, polyacrylic alkyl ester emulsion, polyvinyl acetate resin emulsion, and natural rubber latex.

[0056] Examples of pH adjusters include buffers such as citric acid, lactic acid-sodium lactate, citric acid-sodium citrate, and succinic acid-sodium succinate.

[0057] Examples of vitamins include vitamins A, B1, B2, B6, C, E or derivatives thereof, pantothenic acid or derivatives thereof, and biotin.

[0058] Examples of antioxidants include tocopherols, dibutylhydroxytoluene, butylhydroxyanisole, and gallic acid esters.

[0059] Examples of antioxidant aids include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, and ethylenediaminetetraacetic acid.

[0060] Hair growth ingredients include procyanidins, dipotassium glycyrrhizinate, capronium chloride, hinokitiol, L-hydroxyproline, acetylhydroxyproline, fucoidan, swerthianin, shinhongginisin, flavonoid steroids, FGF-10, Enmeisou extract, Swertia japonica extract, Mitsuishi Kamibu extract, Gynostemma pentaphyllum extract, St. John's wort extract, gentian extract, sage extract, peppermint extract, hop extract, persimmon leaf extract, Rehmannia root extract, carrot extract, linden extract, and Peony extract.

[0061] Other ingredients that can be added include, for example, preservatives (e.g., ethylparaben, butylparaben, chlorphenesin, phenoxyethanol, etc.); disinfectants (e.g., isopropylmethylphenol, benzalkonium chloride, benzethonium chloride, chlorhexidine gluconate, etc.); anti-inflammatory agents (e.g., glycyrrhizinic acid derivatives, glycyrrhetinic acid derivatives, salicylic acid derivatives, hinokitiol, zinc oxide, allantoin, etc.); and various extracts. substances (e.g., Phellodendron bark, Coptis chinensis, Lithospermum root, Peony, Swertia japonica, Birch, Sage, Loquat, Carrot, Aloe, Mallow, Iris, Grape, Job's tears, Loofah, Lily, Saffron, Cnidium rhizome, Angelica acutiloba, St. John's wort, Ononis, Garlic, Chili pepper, Citrus fruit, Angelica acutiloba, Seaweed, etc.), activators (e.g., Royal jelly, photosensitizers, cholesterol derivatives, etc.); blood circulation promoters (e.g., Nonyl acid valenylamide, nicotine acid benzyl ester, nicotinic acid β-butoxyethyl ester, capsaicin, zingerone, cantharides tincture, ichthammol, tannic acid, α-borneol, tocopherol nicotinate, inositol hexanicotinate, cyclandelate, cinnarizine, tolazoline, acetylcholine, verapamil, cepharanthine, γ-oryzanol, etc.); antiseborrheic agents (e.g., sulfur, thianthol, etc.); anti-inflammatory agents (e.g., tranexamic acid, thiotaurine, hypotaurine, etc.), sequestering agents such as edetate disodium, edetate trisodium, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, malic acid, caffeine, tannin, verapamil, tranexamic acid or a derivative thereof, various herbal extracts such as licorice, Chinese quince, and Japanese anemone, tocopherol acetate, glycyrrhetinic acid, glycyrrhizic acid or a derivative thereof, etc.

[0062] The pH of the gel-type hair wash of the present invention is preferably 7 or less, more preferably 2.5 to 7, and even more preferably 3 to 6. A gel-type hair wash with a pH of 7 or less provides good usability (easy to run fingers through and comb through hair). The pH of gel-type hair cleansers can be measured using the method specified in the general testing methods of the Standards for Cosmetic Ingredients (2nd Edition) by inserting the electrodes of a pH meter directly into the gel-type hair cleanser at 25°C and reading the pH value after it has stabilized.

[0063] The gel-type hair wash of the present invention is suitably used in, for example, shampoos, all-in-one shampoos, rinse-in shampoos, and the like. [Example]

[0064] Examples of the present invention will be described below, but the present invention is not limited to these examples. The content of each component described in the test examples is shown in "% by mass" and is all a value converted into a pure content. The evaluation and measurement methods used in the present invention are as follows.

[0065] <ph> The pH of the gel-type hair cleanser was measured using the method specified in the general testing method of the Standards for Cosmetic Ingredients (2nd edition) by inserting the electrodes of a pH meter (manufactured by DKK Toa Corporation) directly into the hair cleanser at 25°C and reading the pH value after it had stabilized.

[0066] <Viscosity> The viscosity of the gel hair wash was measured at 25°C using a B-type viscometer (Brookfield viscometer, manufactured by Brookfield) in accordance with the viscosity measurement method described in the general testing methods of the 17th edition of the Japanese Pharmacopoeia.

[0067] <Usability> -Evaluation of hair's finger-running and comb-running properties- The hair was wetted with 40°C warm water, the prepared gel-type hair cleanser was spread between the palms and applied directly to the hair, lathered and washed, and then rinsed with 40°C warm water. A five-member expert evaluation panel performed a sensory evaluation of the ease of running fingers through and combing the hair before and after use (during and after use), and the five-member expert evaluation panel discussed and evaluated the usability based on the following criteria. [Evaluation criteria] ◯: No problem (hair is easy to run fingers through and comb through) △: Slightly problematic (hair is slightly difficult to run fingers through and comb) ×: Problematic (hard to run fingers through or comb through hair)

[0068] <Foaming property> 400 mL of a 2% by mass aqueous solution of the prepared gel-type hair wash was stirred at 25°C for 1 minute at a maximum stirring speed of 4,300 rpm, after which the liquid volume (mL) was determined and foaming ability was evaluated based on the following criteria. In the present invention, a rating of "Good" or better is an acceptable level. [Evaluation criteria] ◎: Liquid volume is 2,000mL or more 〇: Liquid volume is 1,500mL or more but less than 2,000mL △: Liquid volume is 1,000 mL or more but less than 1,500 mL ×: Liquid volume is less than 1,000 mL

[0069] <High temperature storage stability> 95 mL of the prepared gel-type hair wash was placed in a 100 mL sealed container with a lid and stored in a thermostatic bath at 50°C for 4 weeks. The viscosity at 25°C before and after storage was measured using a B-type viscometer (Brookfield viscometer, manufactured by Brookfield). The rate of change in viscosity was calculated using the following formula 1, and the storage stability at high temperatures was evaluated based on the following criteria. In the present invention, a rating of "good" or better is considered acceptable. [Formula 1] Viscosity change rate (%) = [(viscosity after storage - viscosity before storage) / (viscosity before storage)] x 100 [Evaluation] ◎: Viscosity change rate is less than ±5% ○: Viscosity change rate is between ±5% and 10% △: Viscosity change rate is between ±10% and 15% ×: Viscosity change rate is ±15% or more

[0070] (Preliminary experiment 1) <Preliminary study of the ratio of anionic surfactant to amphoteric surfactant 1> -When the mass ratio [(A) anionic surfactant / (B) amphoteric surfactant] is 0.3 to 4- The hair washes of Test Examples 1-1 to 1-9 were prepared by a conventional method according to Table 1, and the pH and viscosity were measured. The results are shown in Table 1.

[0071] [Table 1]

[0072] From the results in Table 1, it was found that Test Examples 1-1 to 1-7 showed that the viscosity changed depending on the mass ratio [(A) anionic surfactant / (B) amphoteric surfactant], and that the viscosity-increasing effect could be achieved when the mass ratio [(A) anionic surfactant / (B) amphoteric surfactant] was in the range of 0.3 to 0.9. Furthermore, Test Examples 1-3, 1-8, and 1-9 revealed that when the total surfactant content was the same, the single components of sodium cocoyl methyl taurate and sodium lauroyl methyl alanine did not result in an increase in viscosity, but the combined use of sodium cocoyl methyl taurate and sodium lauroyl methyl alanine resulted in an increase in viscosity.

[0073] (Preliminary experiment 2-1) <Preliminary study of the ratio of anionic surfactants to amphoteric surfactants 2> -When the mass ratio [(A) anionic surfactant / (B) amphoteric surfactant] = 0.7- According to Table 2-1, hair washes for each test example were prepared by conventional methods, and the pH and viscosity were measured. The results are shown in Table 2-1.

[0074] [Table 2-1]

[0075] The results in Table 2-1 show that the viscosity varies depending on the blending ratio of sodium cocoyl methyl taurate and sodium lauroyl methyl alanine. Therefore, the preferred range for the increase in viscosity is considered to be a mass ratio (cocoyl methyl taurine sodium / lauroyl methyl alanine sodium) of 0.2 to 2. R do.

[0076] (Preliminary experiment 2-2) <Preliminary study of the ratio of anionic surfactants to amphoteric surfactants 2> -When the mass ratio [(A) anionic surfactant / (B) amphoteric surfactant] = 0.3- According to Table 2-2, hair washes for each test example were prepared by conventional methods, and the pH and viscosity were measured. The results are shown in Table 2-2.

[0077] [Table 2-2]

[0078] The results in Table 2-2 show that the viscosity varies depending on the blending ratio of sodium cocoyl methyl taurate and sodium lauroyl methyl alanine. Therefore, the preferred range for the occurrence of an increase in viscosity is considered to be the mass ratio (cocoyl methyl taurate sodium / lauroyl methyl alanine sodium) = 0.2 to 2, similar to the case where the mass ratio [(A) anionic surfactant / (B) amphoteric surfactant] = 0.7. R do.

[0079] (Preliminary experiment 2-3) <Preliminary study of the ratio of anionic surfactants to amphoteric surfactants 2> -When the mass ratio [(A) anionic surfactant / (B) amphoteric surfactant] = 0.9- According to Table 2-3, the hair wash of each test example was prepared by a conventional method, and the pH and viscosity were measured. The results are shown in Table 2-3.

[0080] [Table 2-3]

[0081] The results in Table 2-3 show that the viscosity varies depending on the blending ratio of sodium cocoyl methyl taurate and sodium lauroyl methyl alanine. Therefore, the preferred range for the occurrence of an increase in viscosity is considered to be the mass ratio (cocoyl methyl taurate sodium / lauroyl methyl alanine sodium) = 0.2 to 2, similar to the case where the mass ratio [(A) anionic surfactant / (B) amphoteric surfactant] = 0.7. R do.

[0082] (Pre-experiment 3) <Preliminary examination of the total content of (A) anionic surfactant and (B) amphoteric surfactant> According to Table 3, hair washes of Test Examples 2-1 to 2-4 were prepared by a conventional method, and the foaming ability was evaluated, and the pH and viscosity were measured. The results are shown in Table 3.

[0083] [Table 3]

[0084] From the results in Table 3, it is considered that the total content of (A) anionic surfactant and (B) amphoteric surfactant is 10 to 25 mass% in terms of foaming ability and viscosity increase, since the viscosity and foaming ability are insufficient when the total content of (A) anionic surfactant and (B) amphoteric surfactant is 5 mass% in Test Example 2-1.

[0085] (Pre-experiment 4) <Preliminary study of the content of PEG-120 methyl glucose dioleate> The hair wash of each test example was prepared by a conventional method according to Table 4, and the pH and viscosity were measured. The results are shown in Table 4.

[0086] [Table 4]

[0087] From the results in Table 4, Test Examples 1-3 to 3-4 confirmed that the incorporation of PEG-120 methyl glucose dioleate had a viscosity increasing effect. On the other hand, when comparing Test Examples 1-2 and 3-5, Test Examples 1-5 and 3-6, and Test Examples 1-6 and 3-7, it was found that even when the amount of PEG-120 methyl glucose dioleate was the same, the viscosity did not increase at the mass ratio [(A) anionic surfactant / (B) amphoteric surfactant] levels of 1.5 and 2.1 (Test Examples 1-5 and 1-6).

[0088] Therefore, when the amount of anionic surfactant blended is greater than the amount of amphoteric surfactant blended, no increase in viscosity due to the blending of PEG-120 methylglucose dioleate is observed. As a result, it is believed that the viscosity increases specifically when the mass ratio [(A) anionic surfactant / (B) amphoteric surfactant] is 0.3 to 0.9, as in the preliminary studies in Test Examples 1-1 to 1-7.

[0089] (Pre-experiment 5) <Preliminary consideration of the amount of acrylate copolymer blended> According to Table 5, the hair wash of each test example was prepared by a conventional method, and the usability was evaluated, and the pH and viscosity were measured. The results are shown in Table 5.

[0090] [Table 5]

[0091] The results in Table 5 show that the viscosity tends to increase depending on the blending amount of acrylate copolymer, but from around 1.5% by mass, the consistency deteriorated and the product became squeaky when used. Therefore, in the hair wash, the blending amount of the acrylate copolymer is preferably 0.1 to 1.2 mass %, more preferably 0.3 to 0.9 mass %.

[0092] (Test Examples 5-1 to 5- 8 ) <Preparation of hair cleanser> Test Examples 5-1 to 5-2 were carried out in accordance with Tables 6-1 and 6-2. 8 The hair cleansing agents were prepared, and their usability, foaming properties, and high-temperature storage stability were evaluated, and their pH and viscosity were measured. The results are shown in Tables 6-1 and 6-2.

[0093] [Table 6-1]

[0094] [Table 6-2]

[0095] From the results in Tables 6-1 and 6-2, it was found that Test Examples 5-3 and Test Examples 5-6 to 5-7 all satisfied all of the requirements of "containing (A) an acylmethyl taurine salt and an acylmethyl alanine salt, (B) at least one selected from alkylamidopropyl betaine and imidazolinium betaine, (C) 1.0% by mass to 3% by mass of polyoxyethylene methyl glucoside dioleate, and (D) an acrylic polymer, wherein the total content of components (A) and (B) is 10% by mass to 25% by mass, and the mass ratio of components (A) to (B) [(A) / (B)] is 0.3 to 0.9, and the viscosity at 25°C is 6,000 mPa·s or more," and a highly viscous gel was achieved, and a gel hair wash having excellent foaming properties and usability and good storage stability at high temperatures was obtained.

[0096] In contrast, Test Examples 5-1 and 5-4 both contain no acrylic polymer (D) and therefore have poor high-temperature storage stability.

[0097] Test Examples 5-2 and 5-5 do not contain (C) polyoxyethylene methyl glucoside dioleate, and therefore have a low viscosity, making it impossible to achieve a highly viscous gel.

[0098] Test Example 5-8 did not satisfy the lower limit of 1.0 mass % or more of the content of (C) polyoxyethylene methyl glucoside dioleate, and therefore the viscosity was high, making it impossible to achieve a highly viscous gel.

[0099] Therefore, it was found that in order to achieve a high viscosity gel and high temperature storage stability, it is necessary to combine (C) 1.0% to 3% by mass of polyoxyethylene methyl glucoside dioleate with (D) an acrylic polymer.

[0100] (Test Examples 6-1 to 6-11) <Preparation of hair cleanser> According to Tables 7-1 and 7-2, hair washes of Test Examples 6-1 to 6-11 were prepared by conventional methods, and their usability, foaming properties, and high-temperature storage stability were evaluated, and their pH and viscosity were measured. The results are shown in Tables 7-1 and 7-2.

[0101] [Table 7-1]

[0102] [Table 7-2]

[0103] From the results of Tables 7-1 and 7-2, it can be seen that Test Examples 6-1 to 6-3, Test Examples 6-5 to 6-8, and Test Examples 6-10 to 6-11 are all compositions containing "(A) an acylmethyl taurine salt and an acylmethyl alanine salt, (B) at least one selected from alkylamidopropyl betaine and imidazolinium betaine, (C) 1.0 mass % to 3 mass % of polyoxyethylene methyl glucoside dioleate, (D) an acrylic polymer and adipic acid, acetic anhydride, and corn starch. and at least one selected from reaction products of starch and starch, the total content of component (A) and component (B) is 10% by mass to 25% by mass, the mass ratio of component (A) to component (B) [(A) / (B)] is 0.3 to 0.9, and the viscosity at 25°C is 6,000 mPa·s or more. It was found that this product satisfies all of the following requirements, making it possible to obtain a gel-like hair wash that is highly viscous, has excellent foaming properties and usability, and has good storage stability at high temperatures.

[0104] In Test Example 6-4, the total content of component (A) and component (B) was 5.0% by mass, which did not satisfy the lower limit of 10% by mass or more for the total content of component (A) and component (B). As a result, the viscosity was low, a high-viscosity gel was not achieved, and the foaming properties were poor.

[0105] In Test Example 6-9, the mass ratio of component (A) to component (B) [(A) / (B)] was 1.5, which did not satisfy the upper limit of 0.9 for the mass ratio [(A) / (B)]. As a result, the viscosity was low and a high-viscosity gel could not be achieved.

[0106] Therefore, it was found that in order to achieve a high viscosity gel and high temperature storage stability, it is necessary to combine (C) polyoxyethylene methyl glucoside dioleate with (D) at least one selected from an acrylic polymer and a reaction product of adipic acid, acetic anhydride, and corn starch.< / ph>

Claims

1. (A) an acylmethyl taurine salt and an acylmethyl alanine salt; (B) at least one selected from alkylamidopropyl betaine and imidazolinium betaine; (C) 1.0% by mass to 3% by mass of polyoxyethylene methyl glucoside dioleate; (D) an acrylic polymer and at least one selected from the group consisting of a reaction product of adipic acid, a reaction product of acetic anhydride, and corn starch; the mass ratio of the acylmethyltaurine salt (A1) to the acylmethylalanine salt (A2) [(A1) / (A2)] is 0.2 to 2; the total content of the component (A) and the component (B) is 10% by mass to 25% by mass, and the mass ratio of the component (A) to the component (B) [(A) / (B)] is 0.3 to 0.9; A gel-type hair wash characterized by having a pH of 7 or less and a viscosity at 25°C of 6,000 mPa·s or more.

2. 2. The gel hair wash according to claim 1, wherein the mass ratio [(A1) / (A2)] of the acylmethyl taurine salt (A1) to the acylmethyl alanine salt (A2) is 0.2 to 1.

3. 2. The gel-type hair wash according to claim 1, wherein the component (B) comprises at least one selected from the group consisting of cocamidopropyl betaine and sodium lauroamphoacetate.

4. 2. The gel hair wash according to claim 1, wherein component (C) comprises PEG 120 methyl glucose dioleate.

5. 2. The gel-type hair wash according to claim 1, wherein the component (D) comprises at least one selected from the group consisting of acrylate copolymers and starch acetate / adipate.

6. 2. The gel hair wash according to claim 1, wherein the content of the component (D) is 0.1% by mass to 1.2% by mass.

7. The gel hair wash according to claim 1, further comprising (E) a cationic polymer.

8. 2. The gel hair wash according to claim 1, having a pH of 2.5 to 7.

9. The gel-type hair wash according to any one of claims 1 to 8, which is used in a shampoo or an all-in-one shampoo.

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