Foaming skin cleanser

Abstract

To provide a foaming skin cleanser which contains an amino acid-based surfactant, while exhibiting long-lasting foam stability and excellent elasticity.SOLUTION: A foaming skin cleanser is contained in an aerosol container filled with an aerosol composition comprising a stock solution containing predetermined amounts of (A) N-acylglutamate salt, (B) lauryl glycol carboxylic acid and a salt thereof, and (C) a nonionic surfactant, and a propellant containing liquefied petroleum gas.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a foam-shaped skin cleanser.

Background Art

[0002] Conventionally, detergents using amino acid-based surfactants are known to be excellent in terms of low irritation to the skin and usability. In the field of aerosol-type skin cleansers, skin cleansers containing amino acid-based surfactants have been variously proposed (Patent Documents 1 to 3).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, conventional aerosol-type skin cleansers containing amino acid-based surfactants have room for improvement from the viewpoints of the persistent stability and elasticity of the foam.

[0005] One aspect of the present invention aims to provide a foam-shaped skin cleanser that contains an amino acid-based surfactant and is excellent in the persistent stability and elasticity of the foam.

Means for Solving the Problems

[0006] As a result of intensive studies to solve the above problems, the present inventors have found that by using a predetermined amount of N-acylglutamate as an amino acid-based surfactant, and further using a predetermined amount of lauryl glycol carboxylic acid and its salts and a nonionic surfactant respectively, it is possible for the first time to provide a foam-shaped skin cleanser that contains an amino acid-based surfactant and is excellent in the sustained stability and elasticity of foam, and thus have completed the present invention.

[0007] That is, a foam-shaped skin cleanser according to an embodiment of the present invention is a foam-shaped skin cleanser filled with an aerosol composition comprising a stock solution and a propellant in an aerosol container, wherein the stock solution contains: A: 0.3 to 15.0% by mass of N-acylglutamate, B: 0.3 to 15.0% by mass of lauryl glycol carboxylic acid and its salts, C: 0.3 to 20.0% by mass of a nonionic surfactant, and the propellant contains liquefied petroleum gas.

Advantages of the Invention

[0008] According to one aspect of the present invention, it is possible to provide a foam-shaped skin cleanser that contains an amino acid-based surfactant and is excellent in the sustained stability and elasticity of foam.

Modes for Carrying Out the Invention

[0009] An embodiment of the present invention will be described below, but the present invention is not limited thereto. The present invention is not limited to each configuration described below, and various modifications are possible within the scope shown in 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. In addition, unless otherwise specified in this specification, "A to B" representing a numerical range means "A or more and B or less".

[0010] 〔1. Foam-shaped Skin Cleanser〕 The foam-shaped skin cleanser according to an embodiment of the present invention is a foam-shaped skin cleanser filled with an aerosol composition composed of a stock solution and a propellant in an aerosol container, wherein the stock solution contains 0.3 to 15.0% by mass of A: N-acylglutamate, 0.3 to 15.0% by mass of B: lauryl glycol carboxylic acid and its salt, and 0.3 to 20.0% by mass of C: nonionic surfactant, and the propellant contains liquefied petroleum gas.

[0011] In the following description, the "foam-shaped skin cleanser according to an embodiment of the present invention" may be referred to as the "present foam-shaped skin cleanser". It can be said that the present foam-shaped skin cleanser is a foam-shaped skin cleanser using a stock solution and a propellant as raw materials, and it can also be said that it is a foam-shaped skin cleanser containing a stock solution and a propellant. Further, in this specification, the "stock solution of the present foam-shaped skin cleanser" is synonymous with the "stock solution contained in the aerosol composition constituting the present foam-shaped skin cleanser", and the "propellant of the present foam-shaped skin cleanser" is synonymous with the "propellant contained in the aerosol composition constituting the present foam-shaped skin cleanser".

[0012] Due to its low irritation to the skin and excellent usability, amino acid-based surfactants are widely used in the field of skin cleansers.

[0013] In recent years, since there is no need to foam the cleanser and a creamy foam-like cleanser can be obtained simply by discharging the cleanser inside from the container, aerosol-type skin cleansers have come to be widely used in the field of skin cleansers.

[0014] On the other hand, it is known that cleansers containing amino acid-based surfactants are inferior in the sustained stability and elasticity of the foam, and the present inventors have found that even when used as an aerosol-type skin cleanser, the resulting foam is inferior in sustained stability and elasticity.

[0015] Under the above circumstances, as a result of intensive studies to provide an aerosol-type skin cleanser that contains an amino acid-based surfactant and yet is excellent in the sustained stability and elasticity of foam, the present inventors have found that a form-type skin cleanser is obtained by using a predetermined amount of N-acylglutamate as the amino acid-based surfactant, and further using predetermined amounts of lauryl glycol carboxylic acid and its salts and a nonionic surfactant. That is, according to this form-type skin cleanser, it has been found for the first time that a form-type skin cleanser that contains an amino acid-based surfactant and yet is excellent in the sustained stability and elasticity of foam can be provided, and the present invention has been completed. Despite containing such an amino acid-based surfactant, a form-type skin cleanser that is excellent in the sustained stability and elasticity of foam has not been known in the past, and it can be said that this is a surprising discovery.

[0016] Hereinafter, details of each component that the present form-type skin cleanser may contain will be described.

[0017] <1-1. Stock solution> The stock solution of the present form-type skin cleanser contains A: N-acylglutamate, B: lauryl glycol carboxylic acid and its salts, and C: a nonionic surfactant.

[0018] (A: N-acylglutamate) The stock solution of the present form-type skin cleanser contains N-acylglutamate as component A. By the stock solution containing component A, the present form-type skin cleanser becomes a form-type skin cleanser that is excellent in the moist feeling after washing. N-acylglutamate is a type of amino acid-based surfactant that has an amino acid (glutamic acid) moiety in its structure.

[0019] The N-acylglutamate as component A may be an inorganic salt exemplified by a salt of N-acylglutamic acid and sodium, potassium, etc., or an organic salt exemplified by a salt of N-acylglutamic acid and triethanolamine, etc.

[0020] The number of carbon atoms in the acyl group portion constituting N-acylglutamate as Component A is not particularly limited, but is preferably 6 to 22, and more preferably 8 to 18.

[0021] Specific examples of N-acylglutamate as Component A include sodium lauroyl glutamate, potassium lauroyl glutamate, triethanolamine lauroyl glutamate, sodium myristoyl glutamate, potassium myristoyl glutamate, potassium stearoyl glutamate, disodium stearoyl glutamate, potassium cocoyl glutamate, sodium coconut oil fatty acid acyl glutamate, triethanolamine coconut oil fatty acid acyl glutamate, sodium coconut oil fatty acid / hardened beef tallow fatty acid acyl glutamate, and the like.

[0022] The stock solution of this foam-type skin cleanser may contain only one type of N-acylglutamate as Component A, or may contain two or more types of N-acylglutamates.

[0023] The content of Component A in the stock solution is 0.3 to 15.0% by mass, preferably 0.8 to 12.0% by mass, and more preferably 1.0 to 8.0% by mass in 100% by mass of the total amount of the stock solution. By setting the content of Component A in the stock solution to 0.3% by mass or more, foam having excellent elasticity can be obtained, and by setting the content of Component A to 15.0% by mass or less, the formulation stability and discharge stability of this foam-type skin cleanser can be improved.

[0024] (B: Lauryl glycol carboxylic acid and its salts) The stock solution of this foam-type skin cleanser contains lauryl glycol carboxylic acid and its salts as Component B. By the stock solution containing Component B, this foam-type skin cleanser becomes a foam-type skin cleanser excellent in the sustained stability and elasticity of the foam, despite containing N-acylglutamate which is an amino acid-based surfactant.

[0025] As component B, only lauryl glycol carboxylic acid may be used, or for example, only lauryl glycol carboxylate such as sodium lauryl glycol carboxylate or potassium lauryl glycol carboxylate may be used, or these may be used in combination.

[0026] The content of component B in the stock solution is 0.3 to 15.0% by mass, preferably 0.8 to 12.0% by mass, and more preferably 1.0 to 8.0% by mass in 100% by mass of the total amount of the stock solution. By setting the content of component B in the stock solution to 0.3% by mass or more, a foam excellent in sustained stability and elasticity can be obtained, and by setting the content of component B to 15.0% by mass or less, the formulation stability and discharge stability of this foam-type skin cleanser can be improved.

[0027] (C: Nonionic surfactant) The stock solution of this foam-type skin cleanser contains a nonionic surfactant as component C. Since the stock solution contains component C, this foam-type skin cleanser becomes a foam-type skin cleanser excellent in detergency.

[0028] Examples of the nonionic surfactant as component C include fatty acid ester type nonionic surfactants, alkyl glyceryl ethers, polyoxyalkylene alkyl ethers, silicone surfactants, alkyl glucosides, and the like. Among these nonionic surfactants, from the viewpoint of detergency, fatty acid ester type nonionic surfactants are preferred as component C.

[0029] Examples of fatty acid ester type nonionic surfactants include polyoxyethylene fatty acid ester type nonionic surfactants, polyglycerin 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 these fatty acid ester type nonionic surfactants, as component C, polyoxyethylene fatty acid ester type nonionic surfactants are more preferable because they have the advantage of improving detergency and foaming properties. Examples of polyoxyethylene fatty acid ester type nonionic surfactants include polyethylene glycol fatty acid esters, such as PEG-80 sorbitan laurate, PEG-50 hydrogenated castor oil, PEG-150 stearate, and the like. Polyethylene glycol fatty acid esters can also be said to be polyhydric alcohol fatty acid ester type nonionic surfactants. Other usable nonionic surfactants include polyoxyalkylene hydrogenated castor oil, glycol fatty acid ester, glycerin fatty acid ester, polyoxyalkylene glyceryl ether fatty acid ester, polyoxyalkylene sorbitan fatty acid ester, and the like. Polyethylene glycol fatty acid esters can also be said to be glycol fatty acid esters. As component C, among the exemplified nonionic surfactants, one kind can be used alone, or two or more kinds can be used in appropriate combination.

[0030] The content of component C in the stock solution is 0.3 to 20.0% by mass, preferably 0.5 to 18.0% by mass, and more preferably 1.0 to 15.0% by mass in 100% by mass of the total amount of the stock solution. By setting the content of component C in the stock solution to 0.3% by mass or more, a foam-like skin cleanser excellent in detergency can be obtained, and by setting the content of component C to 20.0% by mass or less, the formulation stability and discharge stability of this foam-like skin cleanser can be improved.

[0031] (Oil component) The stock solution of this foam-type skin cleanser may contain an oily component in addition to the above components A to C. The oily component that the stock solution of this foam-type skin cleanser may contain is not particularly limited, but it is preferably at least one selected from the group consisting of hydrocarbon oils, silicone oils, ester oils, fatty acids having 12 to 24 carbon atoms, and vegetable oils.

[0032] Examples of hydrocarbon oils include α-olefin oligomers, petrolatum, isoparaffin, light isoparaffin, light liquid isoparaffin, squalane, synthetic squalane, vegetable squalane, liquid isoparaffin, liquid paraffin, hydrogenated polyisobutene, hydrogenated (tetradecenyl / methylpentadecene), isododecane, and the like.

[0033] Examples of silicone oils include dimethyl silicone oils such as methylpolysiloxane (dimethyl silicone); methylphenyl silicone oils such as methylphenylpolysiloxane; cyclic silicone oils such as methylcyclopolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane; modified silicones such as amino-modified silicone (aminopropylmethylsiloxane·dimethylsiloxane copolymer, aminoethylaminopropylsiloxane·dimethylsiloxane copolymer, aminoethylaminopropylmethylsiloxane·dimethylsiloxane copolymer, etc.), carboxy-modified silicone, fatty acid-modified silicone, alcohol-modified silicone, aliphatic alcohol-modified silicone, epoxy-modified silicone, fluorine-modified silicone, alkyl-modified silicone; methylhydrogenpolysiloxane, dimethiconol, and the like.

[0034] Examples of ester oils include cetyl octanoate, ethyl oleate, isopropyl myristate, isopropyl palmitate, myristyl myristate, cetyl palmitate, 2-ethylhexyl palmitate, octyldodecyl myristate, isopropyl isostearate, propylene glycol isostearate, cetyl 2-ethylhexanoate, glyceryl tri(2-ethylhexanoate), glyceryl tri(caprylic / capric acid), isononyl isononanoate, diisopropyl adipate, pentaerythrityl tetraoctanoate, pentaerythritol tetraisostearate, diisostearyl malate, erythrityl triethylhexanoate, 2-ethylhexyl hydroxystearate, dipentaerythrityl hexa(hydroxystearic acid / stearic acid / rosin acid), dipentaerythrityl tetra(hydroxystearic acid / isostearic acid), dipentaerythrityl hexahydroxystearate, glyceryl (ethylhexanoic acid / stearic acid / adipic acid), glyceryl tri(caprylic / capric acid / myristic acid / stearic acid), dipentaerythrityl hexa(behenic acid / benzoic acid / ethylhexanoic acid), and alkyl benzoate. (C 12 ~ 15 )), hydrogenated castor oil of hydroxystearic acid, and the like.

[0035] Examples of vegetable oils include macadamia nut oil, eucalyptus oil, coconut oil, avocado oil, safflower oil, olive oil, palm oil, palm kernel oil, kukui nut oil, shea butter, cocoa butter, almond oil, sunflower oil, rose hip oil, olive squalane, camellia oil, kiwi fruit seed oil, camellia oil, apricot kernel oil, sesame oil, soybean oil, jojoba oil, castor oil, hazelnut oil, meadowfoam oil, mint oil, argan oil, carrot oil, lavender oil, sugar squalane, damask rose flower wax, centifolia rose flower wax, primrose flower wax, and hydrogenated products thereof (e.g., hydrogenated castor oil, hydrogenated jojoba oil, hydrogenated palm oil, hydrogenated avocado oil, hydrogenated soybean oil, etc.).

[0036] As the oily component in the stock solution of this foam-type skin cleanser, among the exemplified oily components, one kind may be used alone, or two or more kinds may be used in appropriate combination.

[0037] When the stock solution of this foam-type skin cleanser contains an oily component, the content of the oily component in the stock solution is preferably 0.5 to 5.0% by mass, more preferably 1.0 to 3.0% by mass, based on 100% by mass of the total amount of the stock solution. By setting the content of the oily component in the stock solution to 0.5% by mass or more, a foam-type skin cleanser with excellent moisturizing feeling on the skin after use can be obtained. By setting the content of the oily component to 5.0% by mass or less, a foam-type skin cleanser with excellent formulation stability can be obtained.

[0038] (Polyhydric alcohol) In addition to the above components A to C, the stock solution of this foam-type skin cleanser may contain a polyhydric alcohol. The polyhydric alcohol that the stock solution of this foam-type skin cleanser may contain is not particularly limited. 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. may be mentioned. As the polyhydric alcohol in the stock solution of this foam-type skin cleanser, among the exemplified compounds, one kind may be used alone, or two or more kinds may be used in appropriate combination.

[0039] Among these polyhydric alcohols, from the viewpoint of providing a foam-type skin cleanser that excels in the moisturizing feeling of the skin after use, polyethylene glycol is preferred as the polyhydric alcohol. When polyethylene glycol is used as the polyhydric alcohol component, the number average molecular weight of polyethylene glycol is not particularly limited, but from the viewpoint of improving formulation stability and discharge stability, it is preferably from 50 to 10,000, more preferably from 100 to 5,000.

[0040] When the stock solution of this foam-type skin cleanser contains a polyhydric alcohol, the content of the polyhydric alcohol in the stock solution is preferably 5.0 to 25.0% by mass, more preferably 10.0 to 20.0% by mass, based on 100% by mass of the total amount of the stock solution. By setting the content of the polyhydric alcohol in the stock solution to 5.0% by mass or more, a foam-type skin cleanser that excels in the moisturizing feeling of the skin after use can be provided, and by setting the content of the polyhydric alcohol to 25.0% by mass or less, a foam-type skin cleanser that excels in formulation stability and discharge stability can be provided.

[0041] (Higher alcohol) The stock solution of this foam-type skin cleanser may contain a higher alcohol in addition to the above components A to C. In this specification, "higher alcohol" is intended to mean a linear or branched monohydric alcohol having 6 or more carbon atoms, and may be an unsaturated higher alcohol or a saturated higher alcohol. The higher alcohol that the stock solution of this foam-type skin cleanser may contain is not particularly limited, and examples include lauryl alcohol, myristyl alcohol, cetyl alcohol (cetanol), stearyl alcohol, cetearyl alcohol, isostearyl alcohol, hexyl decanol, 2-octyldodecanol, oleyl alcohol, decyltetradecanol, behenyl alcohol, and the like. As the higher alcohol in the stock solution of this foam-type skin cleanser, among the exemplified compounds, one kind may be used alone, or two or more kinds may be used in appropriate combination.

[0042] When the stock solution of this foaming skin cleanser contains a higher alcohol, the content of the higher alcohol in the stock solution is preferably 0.1 to 1.2% by mass, more preferably 0.3 to 1.0% by mass, in 100% by mass of the total amount of the stock solution. By setting the content of the higher alcohol in the stock solution to 0.1% by mass or more, a foaming skin cleanser with more excellent foam stability can be provided. Also, by setting the content of the higher alcohol to 1.2% by mass or less, a foaming skin cleanser with excellent formulation stability and discharge stability can be provided.

[0043] (Water) In addition to the above components, the stock solution of this foaming skin cleanser may contain water. The water that this foaming skin cleanser can contain is not particularly limited, and examples include pure water such as purified water, ion-exchanged water, ultrafiltration water, reverse osmosis water, and distilled water, and ultrapure water.

[0044] When the stock solution of this foaming skin cleanser contains water, the content of component E in the stock solution is preferably 50 to 95% by mass, more preferably 55 to 90% by mass, even more preferably 60 to 85% by mass, in 100% by mass of the total amount of the stock solution. By setting the water content in the stock solution to 50% by mass or more, the formulation stability and discharge stability of this foaming skin cleanser can be improved, and by setting the water content to 95% by mass or less, the foam stability and detergency of this foaming skin cleanser can be improved.

[0045] (Other components) The stock solution of this foaming skin cleanser may contain components other than the above-mentioned components (other components) as long as the effects of the present invention are not inhibited. Examples of other components that the stock solution of this foaming skin cleanser may contain include, for example, anionic surfactants other than N-acylglutamate salts; organic powders such as nylon, polystyrene, polyurethane, silicone, cellulose, polyoxyalkylene alkyl ether, silsesquioxane, etc.; inorganic powders such as carbon powder (carbon), silica, talc, hydroxyapatite, zinc oxide, titanium oxide, etc.; polymers obtained using (meth)acrylic acid and / or (meth)acrylic acid alkyl esters and (meth)acrylic acid polyoxyethylene alkyl ether; fragrances; preservatives such as phenoxyethanol, octoxyglycerin, methylparaben, etc.; cooling agents such as menthol, menthyl glyceryl ether, camphor, peppermint oil, etc.; anti-inflammatory agents such as dipotassium glycyrrhizinate, stearyl glycyrrhizinate, etc.; plant extracts such as peony, button pi, loquat, aloe, etc.; bactericides such as isopropylmethylphenol, benzalkonium chloride, hinokitiol, triclosan, dipotassium glycyrrhizinate, salicylic acid, etc.; antioxidants such as tocopherol, dibutylhydroxytoluene, etc.; ultraviolet absorbers such as octyl methoxycinnamate, octyl dimethoxybenzylidene dioxoimidazolidine propionate, hexyl diethylaminohydroxybenzoyl benzoate, t-butylmethoxydibenzoylmethane, octyl triazone, 2-ethylhexyl p-methoxycinnamate, etc.; chelating agents such as edetate salts; skin lightening agents such as arbutin, ascorbic acid, etc.; sequestering agents such as sodium tripolyphosphate, etc. As other components in the stock solution of this foaming skin cleanser, among the exemplified components, one kind may be used alone, or two or more kinds may be used in appropriate combination.

[0046] When the stock solution of this foaming skin cleanser contains other components, the content of the other components in the stock solution is not particularly limited as long as the effects of the present invention are not inhibited, but is preferably 0.5 to 3.0% by mass, and more preferably 1.0 to 2.0% by mass. When the stock solution contains two or more components as other components, the content of the other components in the stock solution is intended to be the total content of the two or more components.

[0047] (Method for producing the stock solution) The stock solution of this foaming skin cleanser can be produced by a conventional method. For example, by mixing the above components A to C, optionally an oily component, a polyhydric alcohol, a higher alcohol and / or other components, and the balance water, by a known method, and stirring with a homomixer or the like, the stock solution can be produced.

[0048] <1-2. Propellant> This foaming skin cleanser contains a propellant. The propellant of this foaming skin cleanser contains a liquefied gas. The liquefied gas contained in the propellant of this foaming skin cleanser is not particularly limited, and examples include liquefied petroleum gas (LPG) such as propane, butane, isobutane, and isopentane; dimethyl ether (DME); fluorocarbons and the like. As the liquefied gas, only one of the above liquefied gases may be used, or two or more may be mixed and used. Among the above liquefied gases, from the viewpoints of foaming properties and compatibility between the stock solution and the propellant, liquefied petroleum gas is preferred as the liquefied gas.

[0049] The content of the liquefied gas in 100% by mass of the total amount of the propellant of this foaming skin cleanser is not particularly limited, but is preferably 90% by mass or more, more preferably 95% by mass or more, and may be 100% by mass. By setting the content of the liquefied gas to 90% by mass or more, a dense and highly stable foam can be provided.

[0050] In addition to liquefied gas, the propellant may contain compressed gases such as air, nitrogen, carbon dioxide gas, nitrous oxide, etc. Among them, carbon dioxide gas is preferable from the viewpoints of foaming and dischargeability.

[0051] When the propellant of this foam-shaped skin cleanser contains a compressed gas, the content of the compressed gas in 100% by mass of the total amount of the propellant is not particularly limited, but is preferably 2 to 15% by mass, and more preferably 3 to 12% by mass. When the content of the compressed gas is 2% by mass or more, a foam-shaped skin cleanser excellent in foaming (foam persists for a long time) can be provided. When the content of the compressed gas is 15% by mass or less, a foam-shaped skin cleanser excellent in dischargeability can be provided.

[0052] The content of the stock solution in this foam-shaped skin cleanser, in other words, in the aerosol composition constituting this foam-shaped cleanser, is not particularly limited, but is preferably 90 to 99% by mass, more preferably 92 to 98% by mass, and even more preferably 94 to 98% by mass in 100% by mass of the total amount of the aerosol composition. By setting the content of the stock solution in the aerosol composition constituting this foam-shaped cleanser to 90% by mass or more, foam with more excellent elasticity can be provided, and by setting it to 99% by mass or less, a foam-shaped skin cleanser excellent in discharge stability can be provided.

[0053] [2. Method for producing and uses of the foam-shaped skin cleanser] This foam-shaped skin cleanser can be produced by a known method. For example, the stock solution is filled into an aerosol container, the container is crimped with an aerosol valve, and then a specified amount of propellant is filled into the container from the stem, and the spray button is attached, whereby this foam-shaped skin cleanser can be produced.

[0054] Note that the aerosol container for filling the aerosol composition is not particularly limited in its form and material as long as it is a pressure-resistant container that can discharge the content (aerosol composition) to form foam. As the aerosol container, any container used in the technical field can be used.

[0055] This foam-type skin cleanser is a skin cleanser used for cleansing the skin of the face and the like. More specifically, this foam-type skin cleanser can be suitably used as a facial cleanser, hand soap, body soap, and scalp cleanser.

Examples

[0056] The present invention will be described in more detail based on examples and the like below, but the present invention is not limited to such examples only.

[0057] 〔Components〕 Details of each component in the examples and comparative examples are as follows. Note that the amounts described in the table are the amounts of each component, not the amounts of the products.

[0058] <Component A> Na cocoyl glutamate (manufactured by Asahi Kasei Fine Chemicals Co., Ltd., product name "Aminosurfact ACDS-L") Na myristoyl glutamate (manufactured by Ajinomoto Co., Inc., product name "Amisoft MS-11") <Amino acid surfactant other than Component A> Na lauroyl aspartate (manufactured by Asahi Kasei Fine Chemicals Co., Ltd., product name "Aminoformer FLDS-L") <Component B> Na lauryl glycol carboxylate (manufactured by Sanyo Chemical Industries, Ltd., product name "Viewlite SHAA") <Component C> Polyglyceryl-10 myristate (manufactured by Aoki Yushi Industry Co., Ltd., product name "Glysurf 10MM") Polyglyceryl-3 caprylate (manufactured by Nikko Chemicals Co., Ltd., product name "NIKKOL Triglyn 1-KF") PEG-8 glyceryl isostearate (manufactured by Aoki Yushi Industry Co., Ltd., product name "Brownon RGL-8MISE") PEG-20 glyceryl isostearate (manufactured by Aoki Yushi Industry Co., Ltd., product name "Brownon RGL-20MISE") PEG-50 Hydrogenated Castor Oil (manufactured by Nippon Emulsion Co., Ltd., product name "EMALEX HC-50") Polysorbate 60 (manufactured by Kao Corporation, product name "Leodol TW-S120V") Lauryl-2 (manufactured by Nikko Chemicals Co., Ltd., product name "NIKKOL BL-2") <Oil-based ingredient> Squalane (manufactured by Nikko Chemicals Co., Ltd., product name "NIKKOL Sugar Squalane") <Higher alcohol> Myristyl alcohol (manufactured by Kao Corporation, product name "Calcohol 4098") <Polyhydric alcohol> Concentrated glycerin (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd., product name "Cosmetic Concentrated Glycerin") PEG-32, PEG-6 (mixture of PEG-32 and PEG-6, manufactured by Aoki Yushi Kogyo Co., Ltd., product name "Brownon PEG-1500") <Water> Purified water <Other ingredients> (Preservative) Phenoxyethanol (manufactured by Yokkaichi Gosei Co., Ltd., product name "Phenoxyethanol-S") <Propellant> Propellant A: Liquefied petroleum gas (mixture of isobutane, butane and propane, manufactured by Koike Chemical Co., Ltd., product name "LPG 20°C 0.39MPa") Propellant B: Mixture of 87.5% by mass of isobutane (manufactured by Koike Chemical Co., Ltd., product name "Isobutane") and 12.5% by mass of carbon dioxide gas (manufactured by Nippon Yekitan Co., Ltd., product name "Liquefied Carbon Dioxide").

[0059] [Evaluation method] <Evaluation of foam stability> The evaluation method for the foam stability of the foam-type skin cleanser was as follows. On a Kim towel (4-fold type: manufactured by Nippon Paper Crecia Co., Ltd.), the foam-type skin cleansers of each example and comparative example were discharged from an aerosol container for 1 second to obtain a dome-shaped foam. The obtained foam was allowed to stand for 3 minutes, and the state was observed. Based on the observation results, the foam stability of the foam-type skin cleanser was evaluated according to the following criteria.

[0060] (Evaluation Criteria) A (Good): The foam did not change even after 3 minutes had passed since ejection. B (Pass): When 1 minute had passed since ejection, the foam did not change. After that, although water release was observed, the shape of the foam was maintained. C (Fail): No foam was formed, or water was released from the foam immediately after ejection, and the shape of the foam was not maintained after 1 minute had passed since ejection.

[0061] When the foam-type skin cleanser meets the above evaluation criteria, (1) obtaining an A evaluation means that the foam-type skin cleanser is particularly excellent in foam stability, and (2) obtaining a B evaluation means that the foam-type skin cleanser, although it does not reach an A evaluation, is sufficiently excellent in foam stability. On the other hand, (3) obtaining a C evaluation means that the foam stability of the foam-type skin cleanser is poor.

[0062] <Evaluation of Foam Elasticity> The method for evaluating the elasticity of the foam of the foam-type skin cleanser was as follows. Onto a Kim towel (4-fold type: manufactured by Nippon Paper Crecia Co., Ltd.), the foam-type skin cleansers of each example and comparative example were ejected from an aerosol container for 1 second to obtain dome-shaped foam. Next, the upper end surface of the obtained dome-shaped foam was gently pressed with a fingertip to confirm the elasticity of the foam. Based on the confirmation results, the elasticity of the foam of the foam-type skin cleanser was evaluated according to the following criteria.

[0063] (Evaluation Criteria) A (Good): When pressed with a fingertip, the foam does not easily collapse, and a strong elasticity that pushes the fingertip back is felt. B (Pass): When pressed with a fingertip, the foam does not easily collapse, and although it is inferior to A, a sufficient elasticity that pushes the fingertip back is felt. C (Fail): When pressed with a fingertip, the foam easily collapses, and no elasticity that pushes the fingertip back is felt at all.

[0064] When the foam-type skin cleanser meets the above evaluation criteria, (1) an A evaluation means that the foam-type skin cleanser can provide particularly elastic foam, and (2) a B evaluation means that the foam-type skin cleanser can provide sufficiently elastic foam although it does not reach an A evaluation. On the other hand, (3) a C evaluation means that the foam-type skin cleanser cannot provide elastic foam.

[0065] <Formulation stability and ejection stability> The evaluation methods for the formulation stability and ejection stability of the foam-type skin cleanser were as follows.

[0066] Regarding formulation stability, the stock solutions and propellants of each example and comparative example were filled into a pressure-resistant glass container, and the pressure-resistant container was stored upright in a constant temperature bath at 5°C, 25°C, and 40°C for 1 week, and then the appearance was visually observed.

[0067] Regarding ejection stability, the foam-type skin cleansers of each example and each comparative example were stored upright in a constant temperature bath at 5°C for 1 week, and then the ejection state when ejected onto the palm for 2 seconds was visually observed.

[0068] Based on the above observation results, the formulation stability and ejection stability of the foam-type skin cleanser were evaluated according to the following criteria.

[0069] (Evaluation criteria) A (good): Regarding formulation stability, there is no separation under all temperature conditions, and the appearance is uniform. Regarding ejection stability, the foam-type skin cleanser is ejected smoothly in a foamy state. B (qualified): Regarding formulation stability, separation is observed under at least one temperature condition, but a uniform appearance is obtained by shaking up and down three times at a speed of once per second with a swing amplitude of 30 cm. Regarding ejection stability, the foam-type skin cleanser is ejected smoothly in a foamy state. C (Defect): Regarding the formulation stability, separation is observed under at least one temperature condition, and even when shaken up and down three times at a speed of once per second with a swing amplitude of 30 cm, a uniform appearance cannot be achieved, and / or regarding the discharge stability, clogging occurs and the foaming skin cleanser cannot be stably discharged.

[0070] For the foaming skin cleanser to be rated (1) A in the above evaluation criteria means that the foaming skin cleanser is particularly excellent in formulation stability and discharge stability. (2) To be rated B means that although the foaming skin cleanser does not reach A rating, it is sufficiently excellent in formulation stability and discharge stability. On the other hand, (3) to be rated C means that the formulation stability and / or discharge stability of the foaming skin cleanser is poor.

[0071] [Examples 1 - 15 and Comparative Examples 1 - 3] By blending each component according to the formulations shown in Tables 1 - 2, the stock solutions of Examples 1 - 16 and Comparative Examples 1 - 3 were prepared. Then, the stock solution and the propellant were mixed at the stock solution ratio and propellant ratio shown in Tables 1 - 2 to prepare an aerosol composition, and the prepared aerosol composition was filled into an aerosol container so that the gas pressure became 0.5 MPa to obtain a foaming skin cleanser. For the obtained foaming skin cleanser, the foam stability, the elasticity of the foam, and the formulation stability and discharge stability were evaluated. As the material of the aerosol container body, an aluminum container was used in the evaluation of the foam elasticity, detergency, and discharge stability, and a glass container was used in the evaluation of the formulation stability. Also, an aerosol container with a button hole of a rounded rectangle of 6.4 mm × 3.0 mm, a stem hole diameter of 0.6 mm (number of stem holes: 1), and a housing hole diameter of 1.3 mm at the lower hole was used.

[0072] [Table 1]

[0073] [Table 2]

[0074] In Tables 1 and 2, "wt%" means "mass %".

[0075] 〔Results〕 As is clear from Tables 1 to 2, the foam-shaped skin cleansers of Examples 1 to 16 are all good in the evaluation of foam stability and foam elasticity. That is, according to one embodiment of the present invention, it was shown that a foam-shaped skin cleanser excellent in foam stability and foam elasticity can be provided.

[0076] 〔Formulation Example 1〕 (Stock solution) Sodium cocoyl glutamate 2.0 mass % Sodium lauryl glycol carboxylate 2.0 mass % Glyceryl isostearate PEG-8 1.5 mass % PEG-50 hydrogenated castor oil 0.3 mass % Polyglyceryl-10 myristate 1.5 mass % Myristyl alcohol 0.2 mass % Concentrated glycerin 10.0 mass % PEG-32, PEG-6 6.0 mass % Jojoba seed oil 0.3 mass % Hyaluronic acid 0.001 mass % Phenoxyethanol 0.5 mass % Fragrance 0.1 mass % Purified water balance Total 100.0 mass % (Propellant) LPG 90.0 mass % Carbon dioxide gas 10.0 mass % Total 100.0 mass % Stock solution: Propellant = 96:4 (mass ratio).

Industrial Applicability

[0077] According to one aspect of the present invention, it is possible to provide a foam-shaped skin cleansing agent that is excellent in foam stability and foam elasticity. Such a foam-shaped skin cleansing agent can be suitably used for cleansing the skin such as the face.

Claims

【Claim 1】 A foam skin cleanser filled with an aerosol composition comprising a stock solution and a propellant in an aerosol container, wherein the stock solution is A: 0.3 to 15.0% by mass of N-acylglutamate, B: 0.3 to 15.0% by mass of lauryl glycol carboxylic acid and its salts, C: containing 0.3 to 20.0% by mass of a nonionic surfactant, and the propellant contains liquefied petroleum gas, a foam skin cleanser.