Skin cleanser composition and method for stabilizing the same at low temperatures

Abstract

To provide a skin cleanser composition excellent in low-temperature stability.SOLUTION: There is provided a skin cleanser composition comprising the following components (A) to (C), wherein the neutralization rate of the component (A) is 90 mol% or more. (A) a higher fatty acid and / or a salt thereof, (B) a surfactant represented by the following formula (1) and (C) a sulfobetaine type amphoteric surfactant. (wherein, RCO represents an aliphatic acyl group having 8 to 22 carbon atoms and M represents an alkali metal atom or an alkanol amine.)SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a skin cleanser composition, and more particularly to a skin cleanser composition having excellent low-temperature stability. [Background technology]

[0002] It has been known to use fatty acid alkali metal salts in skin cleansing compositions, and they are widely used due to their foaming properties, foam quality (creamy properties), and lack of stickiness during rinsing. Fatty acid alkali metal salts generally refer to sodium salts, but they are unsuitable for use in liquid cleansing agents due to issues such as water solubility, and potassium salts of fatty acids (potassium soaps) are therefore used in liquid cleansing agents. In other words, liquid cleansing agents are generally made with potassium soaps with low Krafft points, such as potassium laurate or potassium oleate, as the main ingredient (see, for example, Patent Documents 1 to 7).

[0003] However, the liquid detergent compositions based on potassium salts, such as potassium laurate and potassium oleate, disclosed in Patent Documents 1 to 7, have good low-temperature stability, but generally only produce coarse foam and have the drawback of leaving the skin feeling dry and not moisturized after washing. Possible methods for obtaining fine foam include changing the fatty acid composition of the potassium soap to include more fatty acids with higher melting points than lauric acid or oleic acid, or adding fatty acids (unneutralized soap), but these methods have problems such as crystallization and gelation at low temperatures.

[0004] On the other hand, it is known that good foaming can be obtained even when using hard water, the feeling of tightness after washing can be suppressed or eliminated, and further, specific anionic surfactants can be blended to impart smoothness to the skin (see, for example, Patent Document 8).

[0005] However, the detergent disclosed in Patent Document 8 has problems such as crystallization and gelation at low temperatures. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 61-000300 [Patent Document 2] Japanese Patent Application Publication No. 3-179098 [Patent Document 3] Japanese Patent Application Publication No. 2-142900 [Patent Document 4] Japanese Patent Application Publication No. 57-109900 [Patent Document 5] Japanese Patent Application Publication No. 57-115500 [Patent Document 6] Japanese Patent Application Publication No. 4-173729 [Patent Document 7] Japanese Patent Application Laid-Open No. 2015-196713 [Patent Document 8] Japanese Patent Application Publication No. 2016-190812 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a skin cleanser composition having excellent low-temperature stability. [Means for solving the problem]

[0008] As a result of extensive research into the above-mentioned problems, the inventors have discovered that by combining a higher fatty acid and / or a salt thereof, a specific anionic surfactant, and a sulfobetaine-type amphoteric surfactant, The present invention has been accomplished based on the discovery that a skin cleanser composition having excellent low-temperature stability can be obtained.

[0009] That is, the present invention provides a skin cleansing composition characterized by containing the following components (A) to (C): (A) A higher fatty acid and / or its salt having a neutralization rate of 90 mol % or more (B) Surfactant represented by formula (1) (C) Sulfobetaine-type amphoteric surfactants

[0010] Preferably, the mass ratio of the component (B) to the component (C) ((B) / (C)) is 10 or less in the skin cleanser composition.

[0011] The second invention is a method for stabilizing a skin cleanser composition at low temperatures, which comprises blending the following components (A) and (B) with component (C): (A) A higher fatty acid and / or its salt having a neutralization rate of 90 mol % or more (B) Surfactant represented by formula (1) (C) Sulfobetaine-type amphoteric surfactants [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a skin cleanser composition that has excellent low-temperature stability, good foaming and foam quality (creamyness), no squeaky feeling during rinsing, and an excellent moisturizing effect that provides a moist feeling after towel drying. DETAILED DESCRIPTION OF THE INVENTION

[0013] The skin cleanser composition of the present invention will be described in detail below.

[0014] [Cleaning agent] The skin cleanser of the present invention can be used, for example, in body soap, facial cleanser, hand soap, etc. The formulation of the skin cleanser can be selected from known formulations according to the intended use and purpose of use, etc. For example, it can be in the form of a liquid, cream, gel, paste, etc.

[0015] In the present invention, "low-temperature stability" means that the product will not crystallize or gel even when stored at low temperatures (about 5°C) for a long period of time (about one month).

[0016] <(A) Higher fatty acid and / or salt thereof> The component (A) used in the skin cleanser composition of the present invention is a higher fatty acid and / or its salt, which is added as a component that contributes to foaming, foam quality (creaminess), and a squeaky feeling during rinsing.

[0017] Examples of the higher fatty acid of component (A) include higher fatty acids having 12 to 22 carbon atoms, such as lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and behenic acid; vegetable oils and fats, such as olive oil and cottonseed oil; and animal oils and fats, such as fish oil and beef tallow. These can be used alone or in appropriate combinations of two or more. In the present invention, from the viewpoints of detergency and foaming power, lauric acid, myristic acid, palmitic acid, and stearic acid are more preferably used.

[0018] Examples of salts of component (A) include alkali metal salts and organic amine salts obtained by saponifying or neutralizing higher fatty acids with an alkali agent. Examples of alkali agents that can be used include inorganic alkalis such as sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate; monoethanolamine salts; Examples of suitable alkalis include organic alkalis such as amine, diethanolamine, triethanolamine, trimethylamine, triethylamine, etc. In the present invention, from the viewpoint of foaming power, it is preferable to use an inorganic alkali, and potassium hydroxide is more preferably used.

[0019] The neutralization rate of component (A) is preferably 90 mol% or more, more preferably 97 mol% or less. A neutralization rate of 90 mol% or more results in good low-temperature stability, while a neutralization rate of 97 mol% or less results in good foaming and foam quality (creaminess) and no squeaky feeling during rinsing.

[0020] <(B) Surfactant> Component (B) used in the skin cleanser composition of the present invention is a surfactant represented by the following formula (1): This component is added as a component that contributes to foaming, foam quality (creamyness), a squeaky feeling during rinsing, and a moist feeling after towel drying. [ka] (In formula (1), RCO represents an aliphatic acyl group having 8 to 22 carbon atoms, and M represents an alkali metal atom or alkanolamine.)

[0021] In formula (1), RCO represents an aliphatic acyl group having 8 to 22 carbon atoms, preferably 8 to 18 carbon atoms. The aliphatic acyl group includes not only acyl groups derived from saturated or unsaturated fatty acids having 8 to 22 carbon atoms, but also acyl groups derived from mixed fatty acids containing two or more of these fatty acids. Examples of the aliphatic acyl group include coconut oil fatty acid acyl groups, palm kernel oil fatty acid acyl groups, caproyl groups, lauroyl groups, myristoyl groups, palmitoyl groups, stearoyl groups, oleoyl groups, and behenyl groups. Lauroyl groups, myristoyl groups, coconut oil fatty acid acyl groups, and palm kernel oil fatty acid acyl groups are preferred. Lauroyl groups and coconut oil fatty acid acyl groups are particularly preferred.

[0022] In formula (1), M represents an alkali metal atom or alkanolamine. Examples of alkali metal atoms include sodium and potassium. Examples of alkanolamines include monoethanolamine, diethanolamine, and triethanolamine. Of these, sodium, potassium, and triethanolamine are preferred.

[0023] Specific examples of component (B) include, but are not limited to, sodium lauroyl hydroxyethyl alanine, triethanolamine lauroyl hydroxypropyl alanine, and sodium cocoyl hydroxyethyl alanine. These components may be used alone or in combination of two or more. Commercially available products of component (B) include "Luminovel HS-L" (manufactured by NOF Corporation).

[0024] <(C) Sulfobetaine-type amphoteric surfactant> The component (C) used in the skin cleanser composition of the present invention is a sulfobetaine-type amphoteric surfactant. This component is generally known to be used for the purposes of improving foaming ability, cleansing ability, thickening, and mitigating irritation. On the other hand, in the present invention, it has been discovered that combining this component with component (B) inhibits crystallization and gelation of the skin cleanser composition and contributes to low-temperature stability, and is therefore used as an essential component. The component (C) may be used alone or in an appropriate combination of two or more types. It can be used.

[0025] Specific examples of component (C) include lauryl hydroxysultaine, lauramidopropyl hydroxysultaine, cocamidopropyl hydroxysultaine, etc. Commercially available products include "Amphitol 20HD" (manufactured by Kao Corporation), "Amphorex LSB" (manufactured by Miyoshi Oil & Fats Co., Ltd.), and "Softazoline LSB" (manufactured by Kawaken Fine Chemicals Co., Ltd.).

[0026] In the skin cleanser composition of the present invention, the mass ratio ((B) / (C)) of the component (B) to the component (C) is preferably 10 or less, and more preferably 5 or less. When ((B) / (C)) is 10 or less, the low-temperature stability is good. Furthermore, when ((B) / (C)) is 0.02 or more, the foaming and foam quality (creaminess) are good.

[0027] <Other ingredients> In addition to the above-mentioned components, the skin cleanser composition of the present invention may contain other components, such as anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, water-soluble polymeric compounds, physiologically active ingredients, antioxidants, sequestering agents, preservatives, ultraviolet absorbers, fragrances, moisturizers, salts, solvents, neutralizing agents, insect repellents, enzymes, and the like, as appropriate, within the scope of not impairing the object of the present invention.

[0028] The anionic surfactant is not particularly limited, and examples thereof include potassium N-coconut oil fatty acid acylglycine, sodium N-coconut oil fatty acid acylglycine, ammonium N-palm kernel oil fatty acid acylglycine, potassium N-coconut oil fatty acid acylglutamate, triethanolamine N-coconut oil fatty acid acylglutamate, sodium N-lauroylglutamate, triethanolamine N-lauroylglutamate, sodium N-lauroylalanine, sodium N-stearoylalanine, sodium lauroyl aspartate, sodium α-lauroylsulfonate, sodium myristoyl allylsulfonate, sodium laurylnaphthalenesulfonate, triethanolamine lauryl sulfate, ammonium lauryl sulfate, sodium lauryl ether sulfate, sodium polyoxyethylene lauryl ether sulfate, potassium polyoxyethylene coconut oil fatty acid amide ether sulfate, and the like, and one or more of these may be selected and used as appropriate.

[0029] The amphoteric surfactant is not particularly limited, but examples thereof include lauric acid amidopropyl betaine, coconut oil fatty acid amidopropyl betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, sodium β-aminopropionate, N-lauroyl-N'-carboxymethyl-N'-hydroxyethyl ethylenediamine sodium, lauryl dimethyl aminoacetic acid betaine, coconut oil alkyl dimethyl aminoacetic acid betaine, stearyl dimethyl aminoacetic acid betaine, and the like, and one or more of these may be selected and used as appropriate.

[0030] The nonionic surfactant is not particularly limited, but examples thereof include sorbitan monostearate, polyoxyethylene sorbitan laurate, polyoxyethylene sorbitan triisostearate, decyl glucoside, lauryl glucoside, polyoxyethylene hydrogenated castor oil, polyoxyethylene lauryl ether, polyoxyethylene monoisostearate, polyoxyethylene glyceryl dioleate, coconut oil fatty acid diethanolamide, coconut oil fatty acid monoethanolamide, coconut oil fatty acid N-methylethanolamide, polyoxyethylene polyoxypropylene glycol, polyethylene glycol monolaurate, polyglyceryl monoalkyl ether, and the like, and one or more of these may be selected and used as appropriate.

[0031] The water-soluble polymer is not particularly limited, and examples thereof include hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, polyethylene glycol, highly polymerized polyethylene glycol, polyvinyl alcohol, polyglutamic acid, hydroxypropyl starch phosphate, xanthan gum, carboxyvinyl polymer, acrylic acid-alkyl methacrylate copolymer, alkyl acrylate copolymer, cationized cellulose, cationized guar gum, cationized fenugreek gum, cationized locust bean gum, cationized tara gum, cationized galactomannan, alkyl acrylate-alkyl methacrylate-polyoxyethylene copolymer, dimethyldiallylammonium chloride-acrylamide copolymer, and acrylamide-acrylic acid-dimethyldiallylammonium chloride copolymer, and one or more of these may be selected and used as appropriate.

[0032] Examples of the physiologically active ingredient include substances that impart some kind of physiological activity to the skin when applied to the skin. Examples include anti-inflammatory agents, anti-aging agents, UV protection agents, tightening agents, antioxidants, moisturizing agents, blood circulation promoters, antibacterial agents, disinfectants, drying agents, cooling agents, warming agents, vitamins, amino acids, wound healing promoters, irritation alleviators, analgesics, cell activators, enzyme components, etc. Examples of the physiologically active ingredient include natural plant extracts, seaweed extracts, herbal ingredients, and compounds, and among these, natural plant extracts, seaweed extracts, and herbal ingredients are particularly preferred in terms of safety.

[0033] Examples of the natural plant extracts, seaweed extracts, and herbal ingredients include angelica tree extract, hydrangea extract, althaea extract, aloe extract, apricot extract, ginkgo extract, fennel extract, oolong tea extract, angelica tree extract, scutellaria root extract, Phellodendron bark extract, St. John's wort extract, watercress extract, orange extract, dried seawater, seaweed extract, hydrolyzed wheat powder, hydrolyzed silk, chamomile extract, carrot extract, artemisia capillaris extract, licorice extract, kakyō extract, kiwi extract, cucumber extract, gardenia extract, kumazasa extract, sophora flavescens extract, walnut extract, grapefruit extract, chlorella extract, mulberry extract, black tea extract, yeast extract, collagen, salvia extract, soapwort extract, hawthorn extract, rehmannia root extract, lithospermum root extract, perilla extract, linden extract, peony extract, white birch extract, and horsetail extract. ivy extract, hawthorn extract, elderberry extract, yarrow extract, peppermint extract, sage extract, cnidium extract, Swertia japonica extract, soybean extract, Chinese laurel extract, thyme extract, tea extract, clove extract, tangerine peel extract, Angelica acutiloba extract, Peach kernel extract, Houttuynia cordata extract, tomato extract, natto extract, carrot extract, garlic extract, wild rose extract, honey, witch hazel extract, Japanese knotweed extract, bisabolol, loquat extract, Poria cocos extract, propolis, loofah extract, peppermint extract, linden extract, hop extract, Madonna lily flower extract, horse chestnut extract, soapberry extract, melissa extract, peach extract, saxifrage extract, yuzu extract, mugwort extract, lavender extract, lemon extract, astragalus extract, rosemary extract, and royal jelly extract.

[0034] In addition to the above-mentioned natural plant extracts, seaweed extracts, and herbal ingredients, other ingredients include, for example, biopolymers such as deoxyribonucleic acid, collagen, elastin, chitin, chitosan, and hydrolyzed eggshell membrane; moisturizing ingredients such as amino acids, sodium lactate, urea, sodium pyrrolidone carboxylate, betaine, and whey; oily ingredients such as sphingolipids, ceramides, cholesterol, cholesterol derivatives, and phospholipids; anti-inflammatory agents such as ε-aminocaproic acid, glycyrrhizic acid, β-glycyrrhetinic acid, lysozyme chloride, guaiazulene, and hydrocortisone; vitamins such as vitamins (A, B2, B6, C, D, and E), calcium pantothenate, biotin, nicotinamide, and vitamin C ester; active ingredients such as allantoin, diisopropylamine dichloroacetate, and 4-aminomethylcyclohexanecarboxylic acid; Examples of suitable anti-inflammatory agents include antioxidants such as copherol, carotenoids, flavonoids, tannins, lignans, and saponins; cell activators such as α-hydroxy acids and β-hydroxy acids; blood circulation promoters such as γ-oryzanol and vitamin E derivatives; disinfectants such as isopropylmethylphenol, triclosan, hinokitiol, and benzalkonium chloride; cooling agents such as l-menthol and peppermint oil; and wound healing agents such as retinol and retinol derivatives.

[0035] The present invention will now be described in detail with reference to examples, but the present invention is not limited thereto. Prior to the examples, the test methods and evaluation methods employed in each example will be explained.

[0036] (1) Foaming power test (foaming) 80 mL of a 1% aqueous solution of the skin cleanser composition of each Example or Comparative Example was placed in a 1,000 mL cylindrical container equipped with a stirrer, and the foam volume was measured after stirring at 5,000 rpm for 30 seconds. The evaluation criteria were set as follows: ◎: Extremely good foaming, foam volume 500mL or more ○: Good foaming Foam volume 400mL or more, less than 500mL △: Normal foaming Foam volume 300mL or more, less than 400mL ×: Poor foaming, foam volume less than 300 mL

[0037] (2) Test method for foam quality and rinsing sensation A panel of 20 experts used the skin cleansing compositions of the Examples and Comparative Examples and conducted a sensory evaluation of the foam quality (creamyness) during use, the absence of a squeaky feeling during rinsing, and the moist feeling after towel drying. The average value of the sensory evaluation was recorded as a score. [Foam quality upon use (creamy)] 5: Very good foam quality (creamyness) 4: Good foam quality (creamyness) 3: Neither 2: Poor foam quality (creaminess) 1: The foam quality (creaminess) is very poor [No squeaky feeling when rinsing] 5: No squeaky feeling when rinsing 4: There is little squeaky feeling when rinsing 3: Neither 2: There is a slight squeaky feeling when rinsing 1: There is a squeaky feeling when rinsing [Moisturizing feeling after towel drying] 5: Very moist 4: Moisturizing 3: Neither 2: Slightly dry 1: Dry

[0038] (3) Low temperature stability test (appearance evaluation) The skin cleansing compositions of the Examples and Comparative Examples were filled into glass bottles and left to stand at 5°C for one month, after which the stability over time was evaluated according to the following criteria. ○: No crystallization or gelation △: Partial crystallization and gelation ×: Entirely crystallized and gelled

[0039] Examples 1 to 15 and Comparative Examples 1 to 6 Body shampoo compositions were prepared according to the compositions shown in Tables 1 and 2, and when used, they were examined for foaming, foam quality (creamyness), squeaky feeling during rinsing, moist feeling after towel drying, and low-temperature stability, and the results are shown in Tables 1 and 2. Note that the amounts used in all of the following examples and comparative examples are all in mass %.

[0040] [Table 1]

[0041] [Table 2]

[0042] As is clear from Tables 1 and 2, the body shampoo compositions of Examples 1 to 15, which used the components of the present invention, all exhibited superior performance compared to the compositions of Comparative Examples 1 to 6.

[0043] Other formulation examples of the skin cleanser composition of the present invention are listed below. The skin cleanser compositions of these formulation examples were also examined for the above-mentioned foaming ability, foam quality (creamyness), squeaky feeling during rinsing, moist feeling after towel drying, and low-temperature stability (appearance).

[0044] Formulation Example 1 Body Shampoo (mass %) The neutralization rate of component (A) is 93 mol %. (1) Lauric acid 6.0 (2) Myristic acid 8.0 (3) Palmitic acid 3.0 (4) Stearic acid 0.5 (5) Potassium hydroxide, appropriate amount (6) DPG 4.0 (7) Lauroyl hydroxyethyl alanine triethanolamine 2.0 (8) Sodium lauroyl aspartate 0.5 (9) Lauryl hydroxysulfobetaine 2.0 (10) Coconut oil fatty acid monoethanolamide 1.0 (11) Coconut oil fatty acid N-methylethanolamide 0.5 (12) Lauryl glucoside 1.0 (13) Polyquaternium-10 0.3 (14) Hydroxypropyl methylcellulose 0.4 (15) Dimethyldiallylammonium chloride-acrylamide copolymer 0.3 (16) PEG-65M 0.01 (17) Ethylene glycol distearate 1.0 (18) Phytosteryl / octyldodecyl lauroyl glutamate 0.5 (19) Trimethylglycine 1.0 (20) Polyglyceryl-4 Lauryl Ether 0.5 (21) N-acetylglucosamine 0.01 (22) Potassium chloride 0.1 (23) Sodium chloride 0.1 (24) Disodium edetate 0.1 (25)Fragrance 0.5 (26) Purified water remainder

[0045] A body shampoo of the above composition was prepared by a conventional method, and evaluated for foaming ability, foam quality (creamyness), squeaky feeling during rinsing, moist feeling after towel drying, and low-temperature stability (appearance). All properties were excellent, and good results were obtained.

[0046] Formulation Example 2 Body Shampoo (mass %) The neutralization rate of component (A) is 95 mol %. (1) Lauric acid 8.0 (2) Myristic acid 6.0 (3) Palmitic acid 2.0 (4) Stearic acid 1.0 (5) Potassium hydroxide, appropriate amount (6) Glycerin 2.0 (7) Sodium lauroyl hydroxyethyl alanine 1.0 (8) Lauryl hydroxysulfobetaine 2.0 (9) Lauryl dimethylaminoacetic acid betaine 0.5 (10) Coconut oil fatty acid monoethanolamide 1.0 (11) Coconut oil fatty acid N-methylethanolamide 0.5 (12) Polyquaternium-67 0.2 (13) Hydroxypropyl methylcellulose 0.3 (14) Acrylamide-acrylic acid-dimethyldiallylammonium chloride copolymer 0.3 (15) PEG-7M 0.15 (16) Ethylene glycol distearate 1.2 (17) Kaolin 0.5 (18) Glucosylceramide 0.01 (21) Glycosyltrehalose 2.0 (22) N-acetylglucosamine 0.01 (23) Potassium chloride 0.1 (24) Sodium chloride 0.1 (25) Disodium edetate 0.1 (26)Fragrance 0.5 (27) Purified water remainder

[0047] A body shampoo of the above composition was prepared by a conventional method, and evaluated for foaming ability, foam quality (creamyness), squeaky feeling during rinsing, moist feeling after towel drying, and low-temperature stability (appearance). All properties were excellent, and good results were obtained.

[0048] Formulation example 3 Facial cleanser (mass%) The neutralization rate of component (A) was 92 mol %. (1) Lauric acid 2.5 (2) Myristic acid 3.0 (3) Palmitic acid 1.5 (4) Potassium hydroxide, appropriate amount (5) Sorbitol 5.0 (6) DPG 5.0 (7) Sodium lauroyl hydroxyethyl alanine 6.0 (8) Lauryl hydroxysulfobetaine 3.0 (9) Coconut oil fatty acid monoethanolamide 0.5 (10) Hydroxypropyl methylcellulose 1.5 (11) Dimethyldiallylammonium chloride-acrylamide copolymer 0.2 (12)PEG-7M 0.2 (13) Ethylene glycol distearate 1.0 (14) Phenoxyethanol 0.5 (15) Disodium edetate 0.1 (16)Fragrance 0.2 (17) Purified water remainder

[0049] A facial cleanser foam with the above composition was prepared by conventional methods, and evaluated for foaming ability, foam quality (creamyness), squeaky feeling during rinsing, moist feeling after towel drying, and low-temperature stability (appearance). All properties were excellent, and good results were obtained.

[0050] Formulation Example 3 Gel Facial Cleanser (mass %) The neutralization rate of component (A) is 96 mol %. (1) Lauric acid 2.0 (2) Myristic acid 3.0 (3) Potassium hydroxide, appropriate amount (4) Sorbitol 2.0 (5) Glycosyltrehalose 1.0 (6) Sodium lauroyl hydroxyethyl alanine 4.0 (7) Lauryl hydroxysulfobetaine 3.5 (8) Lauryl amidopropyl betaine 0.5 (9) Alkyl acrylate / alkyl methacrylate / polyoxyethylene copolymer 2.0 (10) Dipotassium glycyrrhizinate 0.1 (11) Isopropylmethylphenol 0.1 (12) Phenoxyethanol 0.5 (13) Tetrasodium edetate 0.1 (14)Fragrance 0.2 (15) Purified water remainder

[0051] A facial cleanser foam with the above composition was prepared by conventional methods, and evaluated for foaming ability, foam quality (creamyness), squeaky feeling during rinsing, moist feeling after towel drying, and low-temperature stability (appearance). All properties were excellent, and good results were obtained.

Claims

1. A skin cleanser composition comprising the following components (A) to (C): (A) A higher fatty acid and / or its salt having a neutralization rate of 90 mol % or more (B) A surfactant represented by formula (1) (C) Sulfobetaine-type amphoteric surfactant 【Chemical 1】 (In formula (1), RCO represents an aliphatic acyl group having 8 to 22 carbon atoms, and M represents an alkali metal atom or alkanolamine.)

2. 2. The skin cleanser composition according to claim 1, wherein the mass ratio of the component (B) to the component (C) ((B) / (C)) is 10 or less.

3. A method for stabilizing a skin cleanser composition at low temperatures, comprising blending the following components (A) and (B) with component (C): (A) A higher fatty acid and / or its salt having a neutralization rate of 90 mol % or more (B) A surfactant represented by formula (1) (C) Sulfobetaine-type amphoteric surfactant 【Chemical 1】 (In formula (1), RCO represents an aliphatic acyl group having 8 to 22 carbon atoms, and M represents an alkali metal atom or alkanolamine.)

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