Foam-type skin cleanser

Abstract

To provide a foamy skin cleanser that excels in foam resilience, detergency, formulation stability and discharge stability.SOLUTION: A foamy skin cleanser comprises a stock solution and a propellant filled into an aerosol container. The stock solution contains specific amounts of bentonite, an anionic surfactant, a nonionic surfactant, a polyhydric alcohol and water. The propellant contains liquefied gas.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a foam状 skin cleansing agent.

Background Art

[0002] Conventionally, among skin cleansing agents such as facial cleansers and hand soaps, a foam状 skin cleansing agent that forms foam by discharging from a pump-type or aerosol-type former container is known as one that can be easily foamed during use (for example, Patent Document 1).

[0003] On the other hand, Patent Document 2 describes that by adding bentonite to a foamy aerosol cosmetic containing a high content of an ultraviolet absorber, caking can be effectively suppressed and the stability of the foamy aerosol cosmetic can be enhanced.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the conventional technologies as described above had room for improvement from the viewpoint of providing a foam状 skin cleansing agent that is excellently balanced in all of foam quality (elasticity of foam), detergency, formulation stability, and discharge stability.

[0006] One aspect of the present invention aims to realize a foam状 skin cleansing agent that is excellent in elasticity of foam, detergency, formulation stability, and discharge stability.

Means for Solving the Problems

[0007] As a result of diligent research to solve the above problems, the present inventors have discovered for the first time that by using a predetermined amount of a specific clay mineral together with a surfactant and a polyhydric alcohol, it is possible to provide a foamy skin cleanser that is excellent in foam elasticity, cleansing power, formulation stability, and dispensing stability, and have completed the present invention. That is, one embodiment of the present invention comprises the following configuration. [1] A foamy skin cleanser comprising a stock solution and a propellant filled in an aerosol container, wherein the stock solution contains the following components A, B, C, D, and E, with the content of component A in the stock solution being 0.5% by mass or more, the content of component B being 0.10 to 13.0% by mass, the content of component C being 0.05 to 11.0% by mass, and the content of component D being 3.0 to 33.0% by mass, and the propellant containing liquefied gas. Ingredient A: Bentonite Component B: Anionic surfactant Ingredient C: Nonionic surfactant Ingredient D: Polyhydric alcohol Ingredient E: Water [2] The foamy skin cleanser according to [1], wherein component C is a fatty acid ester type nonionic surfactant. [3] The foamy skin cleanser according to [1] or [2], wherein the propellant further contains carbon dioxide. [Effects of the Invention]

[0008] According to one aspect of the present invention, a foamy skin cleanser can be provided that exhibits excellent foam elasticity, cleansing power, formulation stability, and dispensing stability. [Modes for carrying out the invention]

[0009] One embodiment of the present invention is described below, but the present invention is not limited thereto. The present invention is not limited to the configurations described below, and various modifications are possible within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Unless otherwise specified in this specification, "A to B" representing a numerical range means "A or more, B or less".

[0010] [1. Foam-type skin cleanser] A foam-type skin cleanser according to one embodiment of the present invention is a foam-type skin cleanser in which a stock solution and a propellant are filled into an aerosol container. The stock solution contains the following components A, B, C, D, and E. The content of component A in the stock solution is 0.5% by mass or more, the content of component B is 0.10 to 13.0% by mass, the content of component C is 0.05 to 11.0% by mass, and the content of component D is 3.0 to 33.0% by mass. The propellant contains liquefied gas. Ingredient A: Bentonite Component B: Anionic surfactant Ingredient C: Nonionic surfactant Ingredient D: Polyhydric alcohol Ingredient E: Water In the following description, "foam-type skin cleanser according to one embodiment of the present invention" may be referred to as "this foam-type skin cleanser." This foam-type skin cleanser can also be described as a foam-type skin cleanser containing a stock solution and a propellant.

[0011] In foam-type skin cleansers, characteristics such as ease of foaming (foaming power), foam quality (fineness of bubbles, etc.), and foam persistence (foam retention) are considered important. Furthermore, in foam-type skin cleansers, for example, a dense and creamy foam quality, with fine bubbles formed at high density, is desired. The foam quality of foam-type skin cleansers depends on the surfactants and thickeners used, and it is known that the foam quality can be adjusted by changing the types and amounts of these ingredients. In contrast, this foam-type skin cleanser, having the above-mentioned composition including bentonite, possesses a distinctive foam quality (excellent elasticity), as well as superior cleansing power, formulation stability, and dispensing stability. The ability to adjust foam quality with bentonite in this way was not previously known. For example, the technology described in Patent Document 2 only states that caking can be suppressed by incorporating bentonite. The details of each component that this foam-type skin cleanser may contain are described below.

[0012] <1-1. Undiluted solution> (Component A) The aforementioned stock solution contains bentonite as component A. Bentonite is a water-swellable clay mineral whose main component is montmorillonite.

[0013] The content of component A in the stock solution is 0.5% by mass or more, preferably 1.0 to 15.0% by mass, more preferably 1.5 to 8.0% by mass, and even more preferably 2.0 to 4.0% by mass. By setting the content of component A in the stock solution to 0.5% by mass or more, foam with excellent elasticity can be obtained. By setting the content of component A to 15.0% by mass or less, the dispensing stability of the foam-type skin cleanser can be improved.

[0014] (Component B) The aforementioned stock solution contains an anionic surfactant as component B. Examples of anionic surfactants include amino acid-type anionic surfactants, sulfate ester-type anionic surfactants, phosphate ester-type anionic surfactants, sulfonic acid-type anionic surfactants, and carboxylic acid-type anionic surfactants. Among anionic surfactants, amino acid-type anionic surfactants are preferred as component B because they have the advantage of providing a good feel and preventing skin tightness after use.

[0015] As the amino acid-type anionic surfactant, N-acyl amino acid salts are preferred, and one or more selected from the group consisting of N-acyl aspartate and N-acyl glutamate are more preferred. Examples of N-acyl aspartate include sodium lauroyl aspartate (Na). Examples of N-acyl glutamate include sodium cocoyl glutamate. Examples of sulfate-type anionic surfactants include alkyl sulfate salts. Examples of phosphate-type anionic surfactants include alkyl ether phosphate salts. Examples of sulfonic acid-type anionic surfactants include alkylphenyl ether sulfonate. Examples of carboxylic acid-type anionic surfactants include alkyl ether carboxylates and polyoxyethylene alkyl carboxylates. Other usable anionic surfactants include polyoxyethylene alkyl ether sulfate and N-acyl-N-methyl taurate. Component B may be one of the exemplified compounds used alone, or two or more may be used in appropriate combinations.

[0016] The content of component B in the undiluted solution is 0.10 to 13.0% by mass, preferably 0.10 to 10.0% by mass. By setting the content of component B in the undiluted solution to 0.10% by mass or more, a foam-type skin cleanser with excellent cleansing power can be provided. By setting the content of component B to 13.0% by mass or less, a foam-type skin cleanser with excellent safety that does not cause excessive irritation to the user's skin can be provided.

[0017] (Component C) The stock solution contains a nonionic surfactant as Component C. Examples of the nonionic surfactant include fatty acid ester type nonionic surfactants, alkyl glyceryl ethers, polyoxyalkylene alkyl ethers, silicone surfactants, alkyl glucosides, and the like. Among the nonionic surfactants, from the viewpoint of detergency, a fatty acid ester type nonionic surfactant is preferable as Component C.

[0018] Examples of the fatty acid ester type nonionic surfactant include polyoxyethylene fatty acid ester type nonionic surfactants, polyglycerol fatty acid ester type nonionic surfactants, polyhydric alcohol fatty acid ester type nonionic surfactants, sorbitan fatty acid ester type nonionic surfactants, and the like. Among the fatty acid ester type nonionic surfactants, from the advantage of being able to improve detergency and foaming properties, a polyoxyethylene fatty acid ester type nonionic surfactant is preferable as Component C. Examples of the polyoxyethylene fatty acid ester type nonionic surfactant include polyethylene glycol fatty acid esters, such as PEG-80 sorbitan laurate, PEG-50 hydrogenated castor oil, PEG-150 stearate, and the like. It can be said that polyethylene glycol fatty acid ester is also a polyhydric alcohol fatty acid ester type nonionic surfactant. Other usable nonionic surfactants include polyoxyalkylene hydrogenated castor oil, glycol fatty acid ester, glycerol fatty acid ester, polyoxyalkylene glyceryl ether fatty acid ester, polyoxyalkylene sorbitan fatty acid ester, and the like. It can be said that polyethylene glycol fatty acid ester is also a glycol fatty acid ester. As Component C, one of the exemplified compounds may be used alone, or two or more thereof may be used in appropriate combination.

[0019] The content of component C in the undiluted solution is 0.05 to 11.0% by mass, preferably 1.5 to 10.5% by mass. By setting the content of component C in the undiluted solution to 0.05% by mass or more, a foam-type skin cleanser with excellent cleansing power can be provided. By setting the content of component C to 11.0% by mass or less, a foam-type skin cleanser with excellent safety that does not cause excessive irritation to the user's skin can be provided.

[0020] (Component D) The stock solution contains a polyhydric alcohol as component D. The polyhydric alcohol is not particularly limited and includes, for example, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, isoprene glycol, dipropylene glycol (DPG), polyethylene glycol (PEG), 1,3-butylene glycol (1,3-butanediol), 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, 1,2-decanediol, glycerin (1,2,3-propanetriol), diglycerin, polyglycerin, sorbitol, maltitol, polyoxyethylene methyl glucoside, polyoxypropylene methyl glucoside, etc. Component D may be one of the exemplified compounds used alone, or two or more may be used in appropriate combinations.

[0021] Among these polyhydric alcohols, it is preferable that the stock solution contains polyethylene glycol as component D, from the viewpoint of providing a foamy skin cleanser that provides excellent moisturizing effects on the skin after use. The number-average molecular weight of polyethylene glycol is not particularly limited, but from the viewpoint of improving formulation stability, it is preferably 50 to 10,000, and more preferably 100 to 5,000.

[0022] The content of component D in the undiluted solution is 3.0 to 33.0% by mass, preferably 5.0 to 25.0% by mass. By setting the content of component D in the undiluted solution to 3.0% by mass or more, a foamy skin cleanser with excellent moisturizing properties and foam elasticity after use can be provided. By setting the content of component D to 33.0% by mass or less, the formulation stability of the foamy skin cleanser is excellent.

[0023] (Component E) The aforementioned stock solution contains water as component E. The water contained as component E in this foamy skin cleanser is not particularly limited and includes, for example, purified water, ion-exchanged water, ultrafiltered water, reverse osmosis water, distilled water, and other pure water and ultrapure water.

[0024] The content of component E in the stock solution is preferably 50 to 98% by mass, more preferably 55 to 95% by mass, and even more preferably 60 to 90% by mass. By setting the content of component E in the stock solution to 50 to 98% by mass, the stability of the formulation can be improved.

[0025] (Component F) The stock solution may contain a higher alcohol as component F. The higher alcohol is not particularly limited and includes, for example, lauryl alcohol, myristyl alcohol, cetyl alcohol (cetanol), stearyl alcohol, cetearyl alcohol, isostearyl alcohol, hexyldecanol, 2-octyldodecanol, oleyl alcohol, decyltetradecanol, behenyl alcohol, etc. Component F may be one of the exemplified compounds used alone, or two or more may be used in appropriate combinations.

[0026] If the stock solution contains component F, the content of component F in the stock solution is preferably 0.1 to 3.0% by mass, and more preferably 0.2 to 1.5% by mass. When the stock solution contains 0.1% by mass or more of component F, a foamy skin cleanser with excellent foam retention (foam lasts for a long time) can be provided. Furthermore, by setting the content of component F to 3.0% by mass or less, a foamy skin cleanser with excellent foam quality (forms fine, homogeneous foam) can be provided.

[0027] (Component G) The aforementioned stock solution may contain powder as component G. In this specification, "powder" refers to an aggregate of particles with a volume-based median diameter (hereinafter also simply referred to as median diameter) of 40 μm or less. The median diameter of the particles can be measured by laser analysis / scattering particle size distribution measurement, and for example, the value measured by a "Particle Size Distribution Meter LA-950V2" (manufactured by Horiba, Ltd.) can be used as the median diameter of the particles.

[0028] The powder is not particularly limited except for its average particle size, and may be organic or inorganic. Furthermore, the particles constituting the powder may originate from natural products, granulated products, composite powders, etc. The shape of the particles constituting the powder is also not particularly limited, and examples include spherical, flake-shaped, plate-shaped, and powder-shaped particles.

[0029] Specific examples of powders include organic powders such as nylon, polystyrene, polyurethane, silicone, cellulose, polyoxyalkylene alkyl ethers, and silsesquioxane; and inorganic powders such as carbon powder, silica, talc, hydroxyapatite, zinc oxide, and titanium dioxide, with inorganic powders being preferred. Among these inorganic powders, one or more selected from carbon powder and talc are more preferred as component G. Carbon powder and talc are preferred from the viewpoint of low cost, and furthermore, carbon powder has the advantage of being able to further improve the cleansing power of foam-type skin cleansers because it has the ability to adsorb sebum and oil stains, and talc also has the advantage of being able to further improve the cleansing power of foam-type skin cleansers. As component G, one of the exemplified powders may be used alone, or two or more may be used in appropriate combinations.

[0030] The median diameter of component G (the median diameter of the particles constituting component G (powder)) is not particularly limited as long as it is 40 μm or less, but from the viewpoint of the risk of staining clothing etc. and the feel of use, 1.0 μm to 38.0 μm is preferred, 5.0 to 35.0 μm is more preferred, and 10.0 to 33.0 μm is particularly preferred.

[0031] If the stock solution contains component G, the content of component G in the stock solution is preferably 0.01 to 6.0% by mass, more preferably 0.05 to 4.0% by mass, and even more preferably 0.5 to 3.0% by mass. By setting the content of component G in the stock solution to 0.01% by mass or more, excellent cleaning power derived from component G can be exhibited. Furthermore, by setting the content of component G to 6.0% by mass or less, the redispersibility of the powder in the stock solution is improved, and the dispensing stability of the foam-type skin cleanser can be improved.

[0032] (Component H) The stock solution may contain a polymer obtained using (meth)acrylic acid and / or an alkyl (meth)acrylate ester and a polyoxyethylene alkyl (meth)acrylate ether as component H. In this specification, "(meth)acrylic acid" means both "acrylic acid" and "methacrylic acid."

[0033] Component H is a polymer obtained by polymerizing monomer H1, which is one or more monomers selected from (meth)acrylic acid and / or alkyl (meth)acrylic acid esters, and monomer H2, which is polyoxyethylene alkyl ether (meth)acrylic acid. Component H can also be described as a polymer containing structural units derived from monomer H1 and structural units derived from monomer H2.

[0034] Examples of polymers obtained using specific (meth)acrylic acid and / or alkyl (meth)acrylic acid esters and (meth)acrylic acid polyoxyethylene alkyl ethers include carboxyvinyl polymers, compounds designated as "ACRYLATES / STEARETH-20METHACRYLATECOPOLYMER" (International Cosmetic Ingredient Dictionary and Handbook, 14th Edition, Vol. 1, CTFA, 2012, pp. 66-67) in INCI name; and compounds designated as "ACRYLATES / STEARETH-20METHACRYLATECROSSPOLYMER" (International Cosmetic Ingredient Dictionary and Handbook, 14th Edition, Vol. 1, CTFA, 2012, pp. 67) in INCI name. Compounds that are written as "(Acrylates / Beheneth-25 Methacrylate Copolymer)"; compounds that are written as "ACRYLATES / BEHENETH-25METHACRYLATECOPOLYMER" (INCI name: International Cosmetic Ingredient Dictionary and Handbook, 14th Edition, Vol. 1, CTFA, 2012, p. 57); compounds that are written as "ACRYLATES / VINYLNEODECANOATECROSSPOLYMER" (INCI name: International Cosmetic Ingredient Dictionary and Handbook, 14th Edition, Vol. 1, CTFA, 2012, p. 68-69); compounds that are written as "ACRYLATES / VINYLNEODECANOATECROSSPOLYMER" (INCI name: International Cosmetic Ingredient Dictionary and Handbook, 14th Edition, Vol. 1, CTFA, 2012, p. 57);Compounds that are denoted as "ACRYLATES / STEARETH-20ITACONATECOPOLYMER" in 66) and compounds that are denoted as "ACRYLATES / CETETH-20ITACONATECOPOLYMER" in the INCI name (International Cosmetic Ingredient Dictionary and Handbook, 14th edition, Vol. 1, CTFA, 2012, p. 60) are examples. Among these, carboxyvinyl polymers are preferred due to their excellent formulation stability. As component H, one of the exemplified compounds may be used alone, or two or more may be used in appropriate combinations.

[0035] Examples of commercially available polymers obtained using (meth)acrylic acid and / or alkyl (meth)acrylate and polyoxyethylene alkyl (meth)acrylate ether include, for example, "CARBOPOL 980 POLYMER" from LUBRIZOL; "Aculin 22", "Aculin 88", "Aculin 28", and "Aculin 38" from Dow Chemical; and "STRUCTURE2001" and "STRUCTURE3001" from AkzoNobel.

[0036] Polymers obtained using (meth)acrylic acid and / or alkyl (meth)acrylic acid esters and polyoxyethylene alkyl (meth)acrylic acid ethers may be used in a neutralized state with a basic substance. That is, as component H, in addition to polymers obtained using (meth)acrylic acid and / or alkyl (meth)acrylic acid esters and polyoxyethylene alkyl (meth)acrylic acid ethers, salts thereof may also be used. Examples of basic substances include alkanolamines such as triethanolamine and monoethanolamine, inorganic bases such as ammonia, sodium hydroxide, and potassium hydroxide, and basic amino acids such as arginine.

[0037] When the stock solution contains component H, the content of component H in the stock solution is preferably 0.003 to 0.3% by mass, more preferably 0.005 to 0.2% by mass, and even more preferably 0.01 to 0.2% by mass. In particular, when used in combination with component G, setting the content of component H in the stock solution to 0.003 to 0.3% by mass can improve the redispersibility of the powder (component G) in the stock solution. In other words, a stock solution with excellent powder redispersibility can be provided.

[0038] The ratio (mass ratio, component G / component H) of component G to component H in the stock solution is not particularly limited, but is preferably 10 to 40, and more preferably 15 to 25. By adjusting the ratio of component G to component H in the stock solution to the above range, a stock solution with superior powder redispersibility can be provided.

[0039] (Other ingredients) The aforementioned stock solution may contain components other than those A to H (other components). Other components include, for example, fragrances; silicone oils such as cyclopentasiloxane, hydrogen dimethicone, caprylyl methicone, methylphenylpolysiloxane, and dimethicone; preservatives such as phenoxyethanol, octoxyglycerin, and methylparaben; cooling agents such as menthol, menthyl glyceryl ether, camphor, and peppermint oil; anti-inflammatory agents such as dipotassium glycyrrhizate and stearyl glycyrrhetinate; plant extracts such as peony, peony root bark, loquat, and aloe; antibacterial agents such as isopropylmethylphenol, benzalkonium chloride, hinokitiol, triclosan, dipotassium glycyrrhizate, and salicylic acid; tocopherol, dibutylhydro Examples of ingredients include antioxidants such as xytoluene; UV absorbers such as octyl methoxycinnamate, octyl dimethoxybenzylidene dioxoimidazolidine propionate, diethylamino hydroxybenzoyl hexyl benzoate, t-butyl methoxydibenzoylmethane, octyl triazone, and 2-ethylhexyl paramethoxycinnamate; chelating agents such as edetates; whitening agents such as arbutin and ascorbic acid; higher fatty acids with 12 to 22 carbon atoms such as lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and behenic acid; vegetable oils such as olive oil, coconut oil, palm oil, and cottonseed oil; animal oils such as fish oil and beef tallow; and chelating agents such as sodium tripolyphosphate. Other ingredients may be used individually or in combination of two or more of the listed ingredients.

[0040] If the stock solution contains other components, the content of these other components is preferably 0.5 to 3.0% by mass, and more preferably 1.0 to 2.0% by mass. If the stock solution contains two or more components as other components, the content of these other components refers to the total content of those two or more components.

[0041] (Method of manufacturing the stock solution) The stock solution can be manufactured by conventional methods. For example, the stock solution can be manufactured by mixing components A to E as described above, and optionally components F, G, H, and other components, and stirring by known methods, specifically by methods such as using a homomixer.

[0042] <1-2. Propellant> The propellant contains a liquefied gas. The liquefied gas is not particularly limited and includes, for example, liquefied petroleum gas (LPG) such as propane, butane, isobutane, and isopentane; dimethyl ether (DME); and fluorocarbons. One or more of the above liquefied gases may be used as the liquefied gas. Among the above liquefied gases, liquefied petroleum gas is preferred as the liquefied gas from the viewpoint of foaming properties and compatibility between the stock solution and the propellant.

[0043] The liquefied gas content in 100% by mass of the propellant may be 100% by mass, but is preferably 85-97% by mass, and more preferably 88-98% by mass. A liquefied gas content of 85% by mass or more provides a foamy skin cleanser with excellent foam retention (the foam lasts for a long time). A liquefied gas content of 97% by mass or less provides a foamy skin cleanser with excellent foam quality (it can form a fine, homogeneous foam).

[0044] The propellant may contain compressed gases such as air, nitrogen, carbon dioxide, or nitrous oxide in addition to liquefied gas. Among these, carbon dioxide is preferred from the viewpoint of foam retention and discharge performance.

[0045] The compressed gas content in 100% by mass of the propellant is not particularly limited, but is preferably 2 to 15% by mass, and more preferably 3 to 12% by mass. A compressed gas content of 2% by mass or more provides a foamy skin cleanser with excellent foam retention (the foam lasts for a long time). A compressed gas content of 15% by mass or less provides a foamy skin cleanser with excellent discharge properties.

[0046] The ratio (mass ratio, concentrate / propellant) of the concentrate to the propellant in this foamy skin cleanser can be set as appropriate, but is preferably 85 / 15 to 98 / 2, and more preferably 92 / 8 to 97 / 3. If the ratio of concentrate to propellant in this foamy skin cleanser is 85 / 15 or higher, it has the advantage of forming a large volume of foam, and if it is 98 / 2 or lower, it has the advantage of forming a dense foam.

[0047] [2. Method and Uses of Foam-Type Skin Cleansing Agent] This foamy skin cleanser can be manufactured by known methods. For example, the foamy skin cleanser can be manufactured by filling an aerosol container with the stock solution, clinching the container with an aerosol valve, filling a specified amount of propellant into the container from the stem, and attaching a spray button. The aerosol container used to fill the stock solution and propellant can be any known and commonly used container, and is not particularly limited.

[0048] This foam-type skin cleanser is a skin cleanser used for washing the skin, such as the face. More specifically, this foam-type skin cleanser can be suitably used as a facial cleanser, hand soap, body soap, and scalp cleanser. [Examples]

[0049] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.

[0050] 〔component〕 Details of each component in the examples and comparative examples are as follows. Note that the amounts listed in the table are the amounts of each component, not the amount of the final product.

[0051] <Ingredient A> Bentonite (manufactured by Nippon Organic Clay Co., Ltd., product name "Bengel") <Component A'> Sulfur-containing aluminum silicate (manufactured by Dainippon Chemical Co., Ltd., product name "Milonecton") Furthermore, the sulfur-containing aluminum silicate used as component A' in the comparative example is merely a clay mineral used for comparison with bentonite, and is not component A according to one embodiment of the present invention.

[0052] <Component B> Sodium lauroyl aspartate (manufactured by Asahi Kasei Finechem Co., Ltd., product name "Aminoformer FLDS-L") Sodium cocoyl glutamate (manufactured by Asahi Kasei Finechem Co., Ltd., product name "AminoSurfact ACDS-L") <Component C> PEG-80 sorbitan laurate (manufactured by NOF Corporation, product name "Nonion LT-280") PEG-150 stearate (manufactured by Kao Corporation, product name "Emanon 3199VB") <Component D> Concentrated glycerin (manufactured by Sakamoto Pharmaceutical Co., Ltd., product name "Cosmetic Concentrated Glycerin") PEG-32, PEG-6 (a mixture of PEG-32 and PEG-6, manufactured by Aoki Oil & Fat Industry Co., Ltd., product name "Brownon PEG-1500") <Component E> purified water <Ingredient F> Myristyl alcohol (manufactured by Kao Corporation, product name "Calcol 4098") <Ingredient G> Charcoal (carbon powder) (manufactured by Horie Seiyaku Co., Ltd., product name "Medicinal Charcoal", median diameter 31.1 μm) <Component H> Carboxyvinyl polymer (manufactured by Lubrizol, product name "CARBOPOL 980 POLYMER") <Other ingredients> (Preservative) Phenoxyethanol (manufactured by Yokkaichi Synthetic Co., Ltd., product name "Phenoxyethanol-S") (Metal chelating agent) Sodium tripolyphosphate (manufactured by Yoneyama Chemical Industries, Ltd., product name: "Sodium Tripolyphosphate") <propellant> Propellant A: Liquefied petroleum gas (a mixture of isobutane, butane, and propane, manufactured by Koike Chemical Co., Ltd., product name "LPG20℃ 0.39MPa") Propellant B: A mixture of 85% by mass isobutane (manufactured by Koike Chemical Co., Ltd., product name "Isobutane") and 15% by mass carbon dioxide (manufactured by Nippon Liquid Carbon Dioxide Co., Ltd., product name "Liquefied Carbon Dioxide").

[0053] [Evaluation Method] <Evaluation of foam elasticity> On a Kimtowel (four-fold type: manufactured by Nippon Paper Crecia Co., Ltd.), foam from each example and comparative example aerosol container was dispensed for 1 second to form a dome shape. Next, the surface of the foam at the top of the dispensed dome was lightly pressed with a fingertip to evaluate the foam's elasticity. Based on the results, the foam's elasticity was evaluated according to the following criteria.

[0054] (Evaluation Criteria) A (Good): The foam does not easily collapse when touched with a fingertip, and you can feel a strong elasticity that pushes back against your fingertip. B (Pass): The foam does not easily collapse with the fingertips, and although it is inferior to A, it has sufficient elasticity to push back against the fingertips. C (Poor): The foam collapses easily with a fingertip, and there is absolutely no elasticity to push back against the fingertip.

[0055] If a foam-type skin cleanser receives an A rating in the above evaluation criteria, (1) an A rating means that the foam-type skin cleanser has particularly excellent foam elasticity, and (2) a B rating means that the foam-type skin cleanser does not reach an A rating but still has sufficiently good foam elasticity. On the other hand, (3) a C rating means that the foam-type skin cleanser has poor foam elasticity.

[0056] <Evaluation of cleaning power> The cleansing power of each example and comparative example of foam-type skin cleanser was evaluated using model sebum (see below). Specifically, a keratin cloth cut to 1.5 cm x 1.5 cm was impregnated with model sebum (a composition containing 30% by mass of fatty acids, lipids, and squalene, etc., per 100% by mass of model sebum, and further containing 0.01% by mass of red dyeing solution (Oil Red O Solution, manufactured by Cosmo Bio Co., Ltd.) to stain the model sebum red), solidified at room temperature for 30 minutes, and then immersed in the foam of the foam-type skin cleanser. After 60 minutes of immersion, the keratin cloth was rinsed with water and the removal of the model sebum was visually evaluated. Based on the results, the cleansing power of the foam-type skin cleanser was evaluated according to the following criteria.

[0057] (Evaluation Criteria) A (Good): Model's sebum was reduced by approximately 30% or more. B (Pass): The model's sebum decreased by approximately 15% or more, but less than approximately 30%. C (Poor): Over 85% of the model's sebum remained.

[0058] If a foam-type skin cleanser receives an A rating in the above evaluation criteria, it means that (1) the foam-type skin cleanser has particularly excellent cleansing power, and (2) a B rating means that the foam-type skin cleanser has sufficiently good cleansing power, although it does not reach an A rating. On the other hand, (3) a C rating means that the foam-type skin cleanser does not have sufficient cleansing power, for example, because the dispensed foam-type skin cleanser contains almost no component A.

[0059] <Formulation stability and dispensing stability> Regarding formulation stability, the stock solution and propellant of each example and comparative example were filled into glass pressure vessels, and these pressure vessels were stored upright in constant temperature baths at 5°C, 25°C, and 40°C for one week, after which their appearance was visually observed.

[0060] Regarding dispensing stability, the foamy skin cleansing agents of each example and comparative example were stored upright in a constant temperature bath at 5°C for one week, and then the dispensing state was visually observed when dispensed onto the palm of the hand for 2 seconds.

[0061] Based on these results, the formulation stability and dispensing stability of the foam-type skin cleanser were evaluated according to the following criteria.

[0062] (Evaluation Criteria) A (Good): Regarding formulation stability, there is no separation and the appearance is uniform under all temperature conditions. Regarding dispensing stability, the foamy skin cleanser is dispensed smoothly in a foamy state. B (Pass): Regarding formulation stability, separation is observed under at least one temperature condition, but a uniform appearance is achieved by shaking the mixture up and down three times at a rate of once per second with a 30 cm amplitude. Regarding dispensing stability, the foamy skin cleanser is dispensed smoothly in a foamy state. C (Poor): Regarding formulation stability, separation is observed where a uniform appearance cannot be achieved even when shaken up and down three times at a rate of once per second with a swing amplitude of 30 cm under at least one temperature condition. And / or, regarding dispensing stability, clogging occurs, and the foamy skin cleanser cannot be dispensed stably.

[0063] If a foam-type skin cleanser receives an A rating in the above evaluation criteria, it means that (1) the foam-type skin cleanser has particularly excellent formulation stability and dispensing stability, and (2) a B rating means that the foam-type skin cleanser does not reach an A rating, but still has sufficiently good formulation stability and dispensing stability. On the other hand, (3) a C rating means that the foam-type skin cleanser has poor formulation stability and / or dispensing stability.

[0064] [Examples] Or, as an example. [1-15 and Comparative Examples 1-9] By combining each ingredient in the formulations shown in Tables 1-3, the following examples were created. Or, as an example.The stock solutions for formulations 1-15 and Comparative Examples 1-9 were prepared. Then, using the stock solution and propellant ratios shown in Tables 1-3, the stock solutions and propellants were filled into aerosol containers to obtain a foamy skin cleanser at a gas pressure of 0.5 MPa. The obtained foamy skin cleanser was evaluated for foam elasticity, cleansing power, formulation stability, and dispensing stability. For the evaluation of foam elasticity, cleansing power, and dispensing stability, an aluminum container was used, while a glass container was used for the evaluation of formulation stability. The aerosol container used had a 6.4 mm x 3.0 mm rounded square buttonhole, a stem hole diameter of 0.6 mm (number of stem holes: 1), and a housing hole diameter of 1.3 mm at the bottom.

[0065] [Table 1]

[0066] [Table 2]

[0067] [Table 3]

[0068] In Tables 1-3, "wt%" means "mass%".

[0069] 〔result〕 From Tables 1-3, Example 1 ~3、6~8、10~14 The foamy skin cleanser exhibits excellent foam elasticity, cleansing power, formulation stability, and dispensing stability. In other words, according to one embodiment of the present invention, it has been demonstrated that a foamy skin cleanser with excellent foam elasticity, cleansing power, formulation stability, and dispensing stability can be provided.

[0070] [Prescription Example 1] (Undiluted solution) Bentonite 3.0% by mass Sodium lauroyl aspartate 2.0% by mass PEG-80 sorbitan laurate 1.5% by mass PEG-50 Hydrogenated Castor Oil 0.2% by mass PEG-150 stearate 1.5% by mass Myristyl alcohol 0.2% by mass Concentrated glycerin 10% by mass PEG-32, PEG-6 5.0% by mass Hyaluronic acid 0.001% by mass Phenoxyethanol 0.5% by mass Sodium tripolyphosphate 0.1% by mass Fragrance 0.1% by mass Purified water residue Total 100.0% by mass (propellant) LPG 90.0% by mass Carbon dioxide 10.0% by mass Concentrate:Propellant = 96:4 (by mass).

[0071] [Prescription Example 2] (Undiluted solution) Bentonite 3.0% by mass Charcoal 1.0% by mass Carboxyvinyl polymer 0.1% by mass Sodium lauroyl aspartate 2.0% by mass PEG-80 sorbitan laurate 1.5% by mass PEG-50 Hydrogenated Castor Oil 0.2% by mass PEG-150 stearate 1.5% by mass Myristyl alcohol 0.2% by mass Concentrated glycerin 5.0% by mass PEG-32, PEG-6 5.0% by mass Phenoxyethanol 0.5% by mass Sodium tripolyphosphate 0.1% by mass Fragrance 0.1% by mass Purified water residue Total 100.0% by mass (propellant) LPG 90.0% by mass DME 10.0% by mass Concentrate:Propellant = 96:4 (by mass). [Industrial applicability]

[0072] The present invention can be suitably used as a foam-type skin cleanser.

Claims

1. A foam-type skin cleanser in which the concentrate and propellant are filled into an aerosol container, The aforementioned stock solution contains the following components A, B, C, D, and E: In the aforementioned stock solution, The content of component A listed below is 0.5 to 8.0% by mass. The content of component B listed below is 0.10 to 13.0% by mass. The content of component C listed below is 1.5 to 11.0% by mass. The content of component D listed below is 5.0 to 33.0% by mass, A foam-type skin cleanser in which the propellant contains liquefied gas. Component A: Bentonite Component B: Anionic surfactant Component C: Fatty acid ester type nonionic surfactant Component D: Polyhydric alcohol Ingredient E: Water

2. The foamy skin cleanser according to claim 1, wherein component C is a polyoxyethylene fatty acid ester type nonionic surfactant.

3. The foamy skin cleanser according to claim 1 or 2, wherein the propellant further contains carbon dioxide.

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