Aerosol cosmetics

Abstract

To provide an aerosol cosmetic capable of allowing a filling product to exist in a state of a water-in-oil Pickering emulsion.SOLUTION: There is provided an aerosol cosmetic comprising an aerosol container, a stock solution filled in the aerosol container and a propellant, wherein the stock solution is a water-in-oil emulsion composition, the stock solution contains water or water and ethanol (component A), an antiperspiration component (component B), an oil agent which is liquid at 25°C selected from the group consisting of a silicone oil, a hydrocarbon oil and an ester oil and a hydrophobic powder (component D), the mass ratio of the total content of the component A and the component B to the content of the component C is 3.5 or less, the content of the total content of the component A and the component B to the content of the component D is 100.0 or less and the content ratio of the content C to the content of the component D is 1.3 or less.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an aerosol cosmetic preparation in which a concentrate and a propellant are filled in an aerosol container. [Background technology]

[0002] Body odors such as armpit odor are caused by the mixture of sweat and sebum, which are decomposed by bacteria normally present on the skin. Therefore, in order to prevent body odor, it is effective to suppress sweat, which causes odor, and antiperspirant compositions containing antiperspirant ingredients are used (e.g., Patent Documents 1 and 2). The antiperspirant effect of the antiperspirant ingredient is exerted by the antiperspirant ingredient being dissolved in a solvent or in a gelled state, blocking sweat glands or penetrating into the sweat glands.

[0003] In antiperspirants of the gel, cream, lotion, roll-on, and other types, the antiperspirant component is present in the antiperspirant composition in a state dissolved in a solvent such as water or ethanol, and therefore, these types of antiperspirants can enhance the antiperspirant effect in a short period of time.

[0004] On the other hand, in aerosol-type antiperspirants, the antiperspirant component is generally present in the form of powder in the antiperspirant composition. Therefore, in aerosol-type antiperspirants, the antiperspirant component (powder) must first be dissolved in sweat, and it takes time for the antiperspirant effect to be exerted. In addition, since the antiperspirant effect is not exerted until sweating, the antiperspirant composition may run down due to sweat, and the antiperspirant effect may not be fully exerted. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] WO2013 / 081055A1 [Patent Document 2] JP 2015-117239 A Summary of the Invention [Problem to be solved by the invention]

[0006] One of the reasons why antiperspirant ingredients are formulated in powder form in conventional aerosol antiperspirants is to reduce the risk of corrosion of the aerosol container. If the antiperspirant ingredient is dissolved in a solvent in an aerosol antiperspirant, the antiperspirant ingredient and ingredients derived from the antiperspirant ingredient (chloride ions, etc.) may come into contact with the aerosol container (a container made of metal such as aluminum), causing corrosion of the aerosol container.

[0007] If the antiperspirant component can be made to exist in a dissolved state in a solvent while minimizing the risk of corrosion of the aerosol container, even an aerosol-type antiperspirant can exert a high antiperspirant effect in a short period of time.

[0008] In order to allow the antiperspirant component to be present in a dissolved state in a solvent while reducing the risk of corrosion of the aerosol container, the inventors attempted to make the concentrate to be filled into the aerosol container a water-in-oil type emulsion having an aqueous phase in which the antiperspirant component is dissolved.

[0009] That is, an object of the present invention is to provide an aerosol cosmetic preparation capable of containing a filler in the form of a water-in-oil Pickering emulsion. [Means for solving the problem]

[0010] The present invention provides an aerosol cosmetic comprising an aerosol container, a concentrate, and a propellant, the concentrate and the propellant being filled in the aerosol container, the concentrate being a water-in-oil emulsion composition, the concentrate containing the following components (A), (B), (C), and (D), wherein the mass ratio of the total content of the components (A) and (B) to the content of the component (C) is 3.5 or less, the mass ratio of the total content of the components (A) and (B) to the content of the component (D) is 100.0 or less, and the mass ratio of the content of the component (C) to the content of the component (D) is 1.3 or more.

[0011] Component (A): Water, or water and ethanol Ingredient (B): Antiperspirant ingredient Component (C): An oil that is liquid at 25°C and is selected from the group consisting of silicone oils, hydrocarbon oils, and ester oils. Component (D): Hydrophobic powder

[0012] In the aerosol cosmetic preparation of the present invention, the component (B) preferably contains the following component (B1).

[0013] Ingredient (B1): An antiperspirant ingredient selected from the group consisting of aluminum chlorohydrate, aluminum chlorohydrate allantoin, zinc paraphenolsulfonate, aluminum chloride, and aluminum potassium sulfate.

[0014] In the aerosol cosmetic preparation of the present invention, the component (D) preferably contains the following component (D1):

[0015] Component (D1): A hydrophobic powder selected from the group consisting of silicone-coated powders and silicone powders.

[0016] In the aerosol cosmetic of the present invention, the concentrate does not contain or contains a surfactant, and if the concentrate contains the surfactant, it is preferable that the content of the surfactant in 100% by mass of the concentrate is 0.1% by mass or less.

[0017] In the aerosol cosmetic preparation of the present invention, it is preferable that the propellant contains the following component (X):

[0018] Component (X): Liquefied gas

[0019] In the aerosol cosmetic preparation of the present invention, the content of the component (B) is preferably 60.0% by mass or less relative to 100% by mass of the total content of the components (A) and (B).

[0020] In the aerosol cosmetic of the present invention, the content of the concentrate is preferably 5.0% by mass or more and 50.0% by mass or less, relative to 100% by mass of the combined total of the concentrate and the propellant. Effect of the Invention

[0021] In the aerosol cosmetic of the present invention, the filler can be present in the form of a water-in-oil Pickering emulsion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] The present invention will be described in detail below.

[0023] The aerosol cosmetic of the present invention comprises an aerosol container, a concentrate, and a propellant, the concentrate and the propellant being filled in the aerosol container, and the concentrate is a water-in-oil emulsion composition.

[0024] In the aerosol cosmetic of the present invention, the concentrate contains "water, or water and ethanol", "an antiperspirant component", "an oil agent that is liquid at 25°C and is selected from the group consisting of silicone oil, hydrocarbon oil, and ester oil", and "hydrophobic powder".

[0025] In this specification, the above-mentioned "water, or water and ethanol" may be referred to as "component (A)".

[0026] In this specification, the above-mentioned "antiperspirant component" may be referred to as "component (B)".

[0027] In this specification, the above-mentioned "oil that is liquid at 25° C. and is selected from the group consisting of silicone oils, hydrocarbon oils, and ester oils" may be referred to as "component (C)".

[0028] In this specification, the above-mentioned "hydrophobic powder" may be referred to as "component (D)".

[0029] In the aerosol cosmetic preparation of the present invention, the mass ratio of the total content of components (A) and (B) to the content of component (C) (total content of components (A) and (B) / content of component (C)) is 3.5 or less.

[0030] In the aerosol cosmetic preparation of the present invention, the mass ratio of the total content of components (A) and (B) to the content of component (D) (total content of components (A) and (B) / content of component (D)) is 100.0 or less.

[0031] In the aerosol cosmetic preparation of the present invention, the mass ratio of the content of component (C) to the content of component (D) (content of component (C) / content of component (D)) is 1.3 or more.

[0032] In the aerosol cosmetic of the present invention, since the above-mentioned configuration is provided, the filling can be present in the state of a water-in-oil (W / O) Pickering emulsion. In the aerosol cosmetic of the present invention, since the above-mentioned three mass ratios have a specific configuration, the concentrate can be present in the aerosol container in the state of a water-in-oil emulsion composition. Therefore, the inner surface of the aerosol container comes into contact with the oil phase (component (C) and propellant, etc.) and is unlikely to come into contact with the aqueous phase (component (A) and component (B), etc.). Therefore, in the aerosol cosmetic of the present invention, the risk of corrosion of the aerosol container can be reduced.

[0033] In addition, the aerosol cosmetic composition of the present invention can contain an antiperspirant component (component (B)) in the aqueous phase, which allows it to exert a high antiperspirant effect in a short period of time.

[0034] Furthermore, in the present invention, component (D) is used to emulsify the aqueous phase instead of a surfactant, so that stickiness can be suppressed and the feeling of smoothness can be enhanced compared to when a surfactant is used. In addition, the powder (component (D)) adsorbed to the oil-water interface forms a strong interface film, so that the emulsified particles are less likely to aggregate or coalesce, and the stability over time can be enhanced compared to when a surfactant is used. Furthermore, even when the concentrate is mixed with a propellant, the emulsified state is extremely unlikely to be broken, and the stability can be enhanced.

[0035] The above-mentioned stock solution contains at least the components (A), (B), (C) and (D). The above-mentioned stock solution may contain other components in addition to the components (A) to (D).

[0036] The above components, for example, component (A), component (B), component (C), component (D) and other components, may each be used alone or in combination of two or more.

[0037] In this specification, the content of each component in the concentrate means the total content of all the components in the concentrate. For example, the content of component (B) means the total content of all the components in the concentrate.

[0038] [Undiluted solution] (Component (A)) Component (A) is water, or water and ethanol. Component (A) may be water, or water and ethanol. Component (A) contains at least water. Component (A) may contain only water, or may contain both water and ethanol. In addition, when the above-mentioned stock solution contains water but does not contain ethanol, component (A) is water, and when the above-mentioned stock solution contains water and ethanol, component (A) is water and ethanol. The above-mentioned water is preferably purified water.

[0039] In the above-mentioned stock solution (100 mass%), the content of component (A) is preferably 5.0 mass% or more, more preferably 10.0 mass% or more, even more preferably 20.0 mass% or more, preferably 60.0 mass% or less, more preferably 50.0 mass% or less, and even more preferably 40.0 mass% or less. When the content of component (A) is equal to or more than the above-mentioned lower limit, stickiness can be further suppressed and the feeling of use can be further improved. When the content of component (A) is equal to or less than the above-mentioned upper limit, the W / O Pickering emulsion can be formed more satisfactorily.

[0040] When component (A) contains ethanol, the content of ethanol in 100 mass% of component (A) is preferably 60.0 mass% or less, and more preferably 50.0 mass% or less.

[0041] (Component (B)) Component (B) is an antiperspirant component. Conventionally known antiperspirant components can be used as component (B). Component (B) may be used alone or in combination of two or more types.

[0042] Examples of component (B) include aluminum chloride, aluminum sulfate, aluminum potassium sulfate, aluminum acetate, chlorohydroxyaluminum, allantoin chlorohydroxyaluminum, chlorohydroxyaluminum-propylene glycol complex, chlorohydroxyaluminum / zirconium-glycine complex, and zinc paraphenolsulfonate.

[0043] From the viewpoint of further enhancing the antiperspirant effect, component (B) preferably contains an antiperspirant component selected from the group consisting of aluminum chlorohydrate, aluminum chlorohydrate allantoin, zinc p-phenolsulfonate, aluminum chloride, and aluminum potassium sulfate, and more preferably contains aluminum chlorohydrate.

[0044] In this specification, the above-mentioned "antiperspirant component selected from the group consisting of aluminum chlorohydrate, aluminum chlorohydrate allantoin, zinc paraphenolsulfonate, aluminum chloride, and aluminum potassium sulfate" may be referred to as "component (B1)".

[0045] Therefore, it is preferable that the component (B) contains the component (B1). It is preferable that the concentrate contains the component (B1). In addition, in the present invention, even if the concentrate contains the component (B1), the risk of corrosion of the aerosol container can be suppressed.

[0046] In the above-mentioned concentrate (100% by mass), the content of component (B) is preferably 1.0% by mass or more, more preferably 2.0% by mass or more, preferably 35.0% by mass or less, more preferably 30.0% by mass or less. When the content of component (B) is equal to or more than the lower limit, the antiperspirant effect can be effectively enhanced. When the content of component (B) is equal to or less than the upper limit, the feeling of tightness on the skin after application can be suppressed.

[0047] In the above-mentioned stock solution (100 mass%), the total content of component (A) and component (B) is preferably 2.0 mass% or more, more preferably 20.0 mass% or more, even more preferably 40.0 mass% or more, preferably 75.0 mass% or less, more preferably 70.0 mass% or less, and even more preferably 65.0 mass% or less. When the total content is equal to or more than the above-mentioned lower limit, stickiness can be further suppressed. When the total content is equal to or less than the above-mentioned upper limit, a W / O Pickering emulsion can be well formed, and the stability of the W / O Pickering emulsion can be improved.

[0048] The mass ratio of the total content of components (A) and (B) to the content of component (C) (total content of components (A) and (B) / content of component (C)) is 3.5 or less. If the mass ratio (total content of components (A) and (B) / content of component (C)) exceeds 3.5, the oily component necessary for emulsifying the aqueous phase is insufficient, making it difficult to emulsify the aqueous phase.

[0049] The mass ratio of the total content of components (A) and (B) to the content of component (C) (total content of components (A) and (B) / content of component (C)) is preferably 0.025 or more, more preferably 0.2 or more, even more preferably 0.5 or more, preferably 3.0 or less, more preferably 2.5 or less, and even more preferably 2.0 or less. When the mass ratio (total content of components (A) and (B) / content of component (C)) is equal to or more than the lower limit, stickiness can be further suppressed. When the mass ratio (total content of components (A) and (B) / content of component (C)) is equal to or less than the upper limit, a W / O Pickering emulsion can be formed more satisfactorily.

[0050] The mass ratio of the total content of components (A) and (B) to the content of component (D) (total content of components (A) and (B) / content of component (D)) is 100.0 or less. If the mass ratio (total content of components (A) and (B) / content of component (D)) exceeds 100.0, the amount of component (D) required for emulsifying the aqueous phase is insufficient, making it difficult to emulsify the aqueous phase.

[0051] The mass ratio of the total content of components (A) and (B) to the content of component (D) (total content of components (A) and (B) / content of component (D)) is preferably at least 1.0, more preferably at least 5.0, and preferably at most 50.0, more preferably at most 20.0, and even more preferably at most 15.0. When the mass ratio (total content of components (A) and (B) / content of component (D)) is at most the upper limit, the particle size of the emulsion particles can be kept small, thereby suppressing the settling rate of the emulsion particles after shaking and improving the usability of the aerosol cosmetic.

[0052] In the total content of components (A) and (B) being 100% by mass, the content of component (B) is preferably 1.0% by mass or more, more preferably 10.0% by mass or more, and preferably 60.0% by mass or less. When the content of component (B) is equal to or more than the lower limit, the antiperspirant effect can be effectively enhanced. When the content of component (B) is equal to or less than the upper limit, component (B) can be well dissolved in component (A), and the water phase in the W / O Pickering emulsion can be well formed.

[0053] (Component (C)) Component (C) is an oil (at least one oil) that is liquid at 25° C. and is selected from the group consisting of silicone oil, hydrocarbon oil, and ester oil. The above-mentioned “liquid at 25° C.” means a property of having fluidity at 25° C. Only one type of component (C) may be used, or two or more types may be used in combination.

[0054] Examples of the silicone oil include dimethyl silicone oils such as methyl polysiloxane and highly polymerized methyl polysiloxane; methyl phenyl silicone oils such as methyl phenyl polysiloxane; cyclic silicone oils such as methyl cyclopolysiloxane, octamethyl cyclotetrasiloxane, decamethyl cyclopentasiloxane, and dodecamethyl cyclohexasiloxane; amino-modified silicones such as aminopropyl methyl siloxane-dimethyl siloxane copolymer, aminoethyl aminopropyl methyl siloxane-dimethyl siloxane copolymer, and aminoethyl aminopropyl methyl siloxane-dimethyl siloxane copolymer, carboxy-modified silicones, fatty acid-modified silicones, alcohol-modified silicones, aliphatic alcohol-modified silicones, epoxy-modified silicones, fluorine-modified silicones, and alkyl-modified silicones; methyl hydrogen polysiloxane, dimethiconol, and the like.

[0055] Examples of the hydrocarbon oil 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), and isododecane.

[0056] Examples of the ester oils include 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, tri(caprylic acid / capric acid)glyceryl, isononyl isononanoate, diisopropyl adipate, pentaerythrityl tetraoctanoate, pentaerythrityl tetraisostearate, and lysine. Examples of suitable glyceryl triglyceride include diisostearyl diglyceride, erythrityl triethylhexanoate, 2-ethylhexyl hydroxystearate, dipentaerythrityl hexa(hydroxystearate / stearic acid / rosin acid), dipentaerythrityl tetra(hydroxystearate / isostearate), dipentaerythrityl hexahydroxystearate, glyceryl (ethylhexanoate / stearic acid / adipic acid), glyceryl tri(caprylic acid / capric acid / myristic acid / stearic acid), and dipentaerythrityl hexa(behenic acid / benzoic acid / ethylhexanoate).

[0057] From the viewpoint of reducing the particle size of the emulsified particles to a certain extent and slowing the settling rate of the emulsified particles, and from the viewpoint of suppressing stickiness and improving the feeling when used, component (C) preferably contains an oil that is liquid at 25°C selected from the group consisting of silicone oils and hydrocarbon oils, and more preferably is an oil that is liquid at 25°C selected from the group consisting of silicone oils and hydrocarbon oils.

[0058] In the above-mentioned stock solution (100 mass%), the content of component (C) is preferably 20.0 mass% or more, more preferably 25.0 mass% or more, preferably 90.0 mass% or less, more preferably 70.0 mass% or less, and even more preferably 60.0 mass% or less. When the content of component (C) is the above-mentioned lower limit or more, the W / O Pickering emulsion can be formed more satisfactorily. When the content of component (C) is the above-mentioned upper limit or less, the stickiness can be further suppressed.

[0059] The mass ratio of the content of component (C) to the content of component (D) (content of component (C) / content of component (D)) is 1.3 or more. If the mass ratio (content of component (C) / content of component (D)) is less than 1.3, component (D) cannot be dispersed in the oil phase and is prone to aggregation.

[0060] The mass ratio of the content of component (C) to the content of component (D) (content of component (C) / content of component (D)) is preferably 1.5 or more, more preferably 2.0 or more, and preferably 20.0 or less, more preferably 15.0 or less. When the mass ratio (content of component (C) / content of component (D)) is equal to or more than the lower limit and equal to or less than the upper limit, a W / O Pickering emulsion can be well formed, and the stability of the W / O Pickering emulsion can be improved.

[0061] (Component (D)) Component (D) is a hydrophobic powder. By using component (D), the aqueous phase can be emulsified. By using component (D), stickiness can be suppressed and a smooth feeling can be enhanced. Component (D) may be used alone or in combination of two or more kinds.

[0062] The contact angle of component (D) with respect to water is equal to or greater than 120°. In other words, a powder having a contact angle with water of equal to or greater than 120° is defined as a hydrophobic powder (component (D)).

[0063] The contact angle of component (D) with respect to water is preferably 130° or more. The contact angle of component (D) with respect to water may be 160° or less, or may be 150° or less.

[0064] The contact angle with respect to water is measured using a contact angle meter (for example, "DM500" manufactured by Kyowa Interface Science Co., Ltd.).

[0065] Examples of the component (D) include silicone-coated powders and silicone powders, etc. Examples of the silicone-coated powders include silicone-coated silica, silicone-coated talc, silicone-coated sericite, and silicone-coated mica, etc.

[0066] Component (D) preferably contains a hydrophobic powder (at least one hydrophobic powder) selected from the group consisting of silicone-coated powders and silicone powders.

[0067] In this specification, the above-mentioned "hydrophobic powder selected from the group consisting of silicone-coated powder and silicone powder" may be referred to as "component (D1)".

[0068] Therefore, the component (D) preferably contains the component (D1). The above-mentioned stock solution preferably contains the component (D1).

[0069] The average particle size of component (D) is preferably 0.5 μm or more, more preferably 1.0 μm or more, and preferably 15.0 μm or less, more preferably 10.0 μm or less. When the average particle size of component (D) is equal to or more than the lower limit, the smooth feeling can be further improved. When the average particle size of component (D) is equal to or less than the upper limit, the emulsion particles become finer, and the W / O Pickering emulsion can be better formed.

[0070] The average particle size (average primary particle size) of component (D) is the volume average particle size. The average particle size can be measured using a particle size distribution measuring device that uses laser light diffraction. Examples of the particle size distribution measuring device include the "LA-920" manufactured by Horiba, Ltd.

[0071] In the above-mentioned concentrate (100% by mass), the content of component (D) is preferably 0.5% by mass or more, more preferably 2.0% by mass or more, even more preferably 4.0% by mass or more, preferably 30.0% by mass or less, more preferably 15.0% by mass or less. When the content of component (D) is equal to or more than the above-mentioned lower limit, a W / O Pickering emulsion can be well formed and the smooth feeling can be further enhanced. When the content of component (D) is equal to or less than the above-mentioned upper limit, a good smooth feeling can be imparted while suppressing white cast (the phenomenon in which a cosmetic product precipitates and appears white after application and drying).

[0072] (Other ingredients) The above-mentioned stock solution may contain other components than the above-mentioned components (A) to (D) to the extent that the effects of the present invention are not impaired. The other components than the above-mentioned components (A) to (D) may each be used alone or in combination of two or more.

[0073] Examples of the other components include bactericides, vegetable oils, higher alcohols, higher fatty acids, film-forming polymers, surfactants, moisturizers, deodorants, sequestering agents, preservatives, cooling agents, anti-inflammatory agents, plant extracts, hydrophilic powders, and fragrances.

[0074] Examples of the bactericide include isopropylmethylphenol, lysozyme chloride, hinokitiol, and salicylic acid.

[0075] Examples of the 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, rosehip oil, olive squalane, camellia oil, kiwi fruit seed oil, camellia oil, apricot kernel oil, sesame oil, soybean oil, jojoba oil, castor oil, hazelnut oil, medlar oil, peppermint oil, argan oil, carrot oil, lavender oil, sugar squalane, damask rose flower wax, centifolia rose flower wax, jasmine flower wax, and hydrogenated products thereof (e.g., hydrogenated castor oil, hydrogenated jojoba oil, hydrogenated palm oil, hydrogenated avocado oil, hydrogenated soybean oil, etc.).

[0076] Examples of the higher alcohol include aliphatic alcohols having 12 to 22 carbon atoms, such as lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, isostearyl alcohol, cetostearyl alcohol, and oleyl alcohol.

[0077] Examples of the higher fatty acids include fatty acids having 12 to 22 carbon atoms, such as lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and behenic acid.

[0078] The cooling agents include menthol, camphor, and menthyl glyceryl ether.

[0079] The stock solution preferably does not contain a surfactant or contains a surfactant at a content of 0.1% by mass or less. When the stock solution contains a surfactant, the content of the surfactant in 100% by mass of the stock solution is preferably 0.1% by mass or less, more preferably 0.05% by mass or less, and even more preferably 0.01% by mass or less. It is particularly preferable that the stock solution does not contain a surfactant.

[0080] The above-mentioned stock solution can be produced by a conventionally known method for producing a water-in-oil emulsion cosmetic composition. For example, the above-mentioned stock solution can be produced by adding a hydrophobic powder to a separately prepared oil phase component while heating as necessary, stirring, and emulsifying the aqueous phase component by stirring. A homomixer or the like is used for mixing and emulsifying.

[0081] [Propellant] The above-mentioned propellants include liquefied petroleum gas (LPG), dimethyl ether (DME), isobutane, fluorocarbons, nitrogen gas, etc. The above-mentioned propellants may be used alone or in combination of two or more kinds.

[0082] From the viewpoint of improving the compatibility between the concentrate and the propellant and enhancing the ejection stability, the propellant preferably contains a liquefied gas, and more preferably is liquefied petroleum gas.

[0083] In this specification, the above-mentioned "liquefied gas" may be referred to as "component (X)".

[0084] Therefore, the propellant preferably comprises component (X), and more preferably is component (X).

[0085] In the 100% by mass of the propellant, the content of component (X) is preferably 50.0% by mass or more, more preferably 60.0% by mass or more, even more preferably 80.0% by mass or more, particularly preferably 90.0% by mass or more, and most preferably 100% by mass (total amount). When the content of component (X) is equal to or more than the lower limit, the compatibility of the concentrate with the propellant can be further increased, and the ejection stability can be further increased.

[0086] [Aerosol cosmetics] The aerosol cosmetic of the present invention comprises an aerosol container, the concentrate, and the propellant. In the aerosol cosmetic, the concentrate and the propellant are filled in the aerosol container. The concentrate is a blend of the contents filled in the aerosol container of the aerosol cosmetic, excluding the propellant.

[0087] The concentrate is preferably a water-in-oil emulsion antiperspirant composition, and the aerosol cosmetic is preferably an aerosol antiperspirant.

[0088] The aerosol cosmetic may be an aerosol spray cosmetic or an aerosol foam cosmetic. In the aerosol cosmetic, the concentrate may be capable of being discharged from an aerosol container in a spray form (mist), or in a foam form (foam). The aerosol container may have a button-type actuator, or may have a foam actuator. The aerosol cosmetic is preferably an aerosol spray cosmetic. In the aerosol cosmetic, the concentrate is preferably capable of being discharged from an aerosol container in a spray form (mist).

[0089] The material of the aerosol container includes metal, etc., and examples of the metal include aluminum, etc. In the present invention, even if the material of the aerosol container is metal, the antiperspirant component and components derived from the antiperspirant component are unlikely to come into contact with the metal, so that the risk of corrosion of the aerosol container can be reduced.

[0090] The aerosol cosmetic preparation can be prepared by a conventional method, such as filling an aerosol container with the concentrate or each of the ingredients contained in the concentrate, clinching the aerosol container with an aerosol valve, filling the propellant through the stem, and attaching a suitable spray button to the stem.

[0091] The content of the concentrate is preferably 5.0% by mass or more, more preferably 10.0% by mass or more, preferably 50.0% by mass or less, more preferably 30.0% by mass or less, out of the total of the concentrate and the propellant (100% by mass). When the content of the concentrate is equal to or more than the lower limit and equal to or less than the upper limit, the ejection property is further improved. When the content of the concentrate is equal to or less than the upper limit, the stickiness can be further effectively suppressed. EXAMPLES

[0092] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0093] In the examples and comparative examples, the following components were used.

[0094] (Component (A)) purified water ethanol

[0095] (Component (B)) Aluminum chlorohydrate Zinc Paraphenol Sulfonate

[0096] (Component (C)) Methylpolysiloxane Mineral oil Isododecane Cetyl Ethylhexanoate Isononyl Isononanoate Ethylhexyl Palmitate Trioctanoin

[0097] (Component (D)) Silicone-coated silica 1 (Miyoshi Chemical Industries, Ltd. "SI-SB-300 LHC") Silicone-coated silica 2 (Miyoshi Chemical Industries, Ltd. "SA-SB-300") Silicone-coated talc (Miyoshi Chemical Industries, Ltd. "SI-Talc JA-46R LHC") Silicone-coated sericite ("SI01-2 SERICITE FSE" manufactured by Daito Kasei Co., Ltd.) Polymethylsilsesquioxane ("KMP-591" manufactured by Shin-Etsu Chemical Co., Ltd.) (Diphenyl dimethicone / vinyl diphenyl dimethicone / silsesquioxane) crosspolymer ("KSP-300" manufactured by Shin-Etsu Chemical Co., Ltd.)

[0098] The contact angle of the above-mentioned powder (component (D)) with water was all 120° or more.

[0099] (Powder not corresponding to component (D): Hydrophilic powder) Silica (JGC Catalysts and Chemicals "Silica Microbeat P-1500") Talc (Matsumura Sangyo Co., Ltd. "Crown Talc Official PP")

[0100] The contact angles of the above-mentioned powders (powders not corresponding to component (D)) with water were all less than 120°.

[0101] (others) (Dimethicone / vinyl dimethicone) crosspolymer

[0102] (Propellant) Liquefied Petroleum Gas (LPG) Dimethyl Ether (DME) HFO-1234ze

[0103] (Examples 1 to 37 and Comparative Examples 1 to 7) Preparation of aerosol cosmetics (aerosol spray cosmetics): The ingredients shown in Tables 1 to 6 below were blended (unit: mass%) to prepare concentrates having the compositions shown in Tables 1 to 6 below. The obtained concentrates were filled into an aerosol spray container (capacity 95 mL, made of aluminum). Next, an aerosol valve was clinched to the aerosol spray container, and the propellants shown in Tables 1 to 6 below were filled from the stem, and a button suitable for the stem was attached to prepare an aerosol spray cosmetic. The button hole diameter was about 0.5 mm. The blend amounts in the tables (amount blended in 100% by mass of concentrate) are shown as the blend amounts of pure components (unit: mass%). The mass ratio of the concentrate to the propellant in the aerosol spray container is as shown in the tables, and the total amount of the concentrate and the propellant is 40 g.

[0104] (evaluation) (Test Example 1: Formability of W / O Pickering Emulsion) A transparent pressure-resistant bottle (capacity 100 mL) was filled with the stock solution and the propellant so that the total amount of the stock solution and the propellant was 30 g. The composition of the stock solution, the composition of the propellant, and the mass ratio of the stock solution to the propellant were the same as those of the aerosol cosmetic (the composition and mass ratio shown in the table). The appearance and properties of the emulsion particles were observed with a microscope (magnification 120 times) and evaluated based on the following evaluation criteria.

[0105] <Evaluation Criteria for the Formation of W / O Pickering Emulsion> ○ (Good): W / O Pickering emulsion is formed. × (Poor): W / O Pickering emulsion is not formed.

[0106] For the aerosol cosmetic for which the evaluation result of Test Example 1 was × (poor), the subsequent tests were not conducted.

[0107] (Test Example 2: Observation of the Inner Surface State of the Aerosol Spray Container) The obtained aerosol spray cosmetic was stored in a constant temperature bath at 50 °C for 2 weeks. After storage, the state of the inner surface of the aerosol spray container was observed and evaluated based on the following evaluation criteria.

[0108] <Evaluation Criteria for the Observation of the Inner Surface State of the Aerosol Spray Container> ○ (Good): No rust and blisters are observed on the inner surface of the aerosol spray container. × (Poor): Rust or blisters are observed on the inner surface of the aerosol spray container.

[0109] An aluminum piece was immersed in a mixed solution containing 80.0% by mass of water and 20.0% by mass of chlorohydroxyaluminum and stored in a constant temperature bath at 50 °C for 2 weeks in this state. After storage, when the surface of the aluminum piece was observed, corrosion was observed on the surface of the aluminum piece.

[0110] (Test Example 3: Sedimentation Rate) The concentrate and propellant were filled into a transparent pressure bottle (volume 100 mL) so that the total amount of concentrate and propellant was 30 g. The composition of the concentrate, the composition of the propellant, and the mass ratio of the concentrate to the propellant were the same as those of the aerosol cosmetic (composition and mass ratio shown in the table). The transparent pressure bottle was then shaken five times at a vertical width of 20 cm in an environment of 25°C and normal pressure, and then allowed to stand. After being allowed to stand, the time until the emulsion particles settled to the bottom of the transparent pressure bottle was measured, and evaluated based on the following evaluation criteria.

[0111] <Settling velocity evaluation criteria> A: After shaking, it takes 3 seconds or more for the emulsion particles to settle to the bottom of the transparent pressure-resistant bottle. B: After shaking, the time it takes for the emulsion particles to settle to the bottom of the transparent pressure-resistant bottle is 1 second or more but less than 3 seconds. C: After shaking, it takes less than 1 second for the emulsion particles to settle to the bottom of the transparent pressure bottle.

[0112] It should be noted that even the aerosol spray cosmetics of the Examples for which the above evaluation result was "C" were usable for practical purposes.

[0113] (Test Example 4: Feeling of use (sticky feeling and smooth feeling)) The obtained aerosol spray cosmetic was shaken 5 times at a height of 20 cm under normal temperature and pressure, and immediately thereafter sprayed onto the skin for 1 second. The sensation of use was evaluated based on the following evaluation criteria. The evaluation was performed by a panel of three experts, who decided the evaluation results through discussion.

[0114] <Usability evaluation criteria> A: Less sticky and has a smooth feel B: Not sticky, but not smooth C: Sticky and not smooth

[0115] It should be noted that even the aerosol spray cosmetics of the Examples, which received the above evaluation result of "C", had a usability sufficient for practical use.

[0116] The compositions and results are shown in Tables 1 to 6 below.

[0117] [Table 1]

[0118] [Table 2]

[0119] [Table 3]

[0120] [Table 4]

[0121] [Table 5]

[0122] [Table 6]

[0123] The particle sizes of the W / O Pickering emulsions observed in Examples 12 to 15, 21, and 22 were larger than the particle sizes of the W / O Pickering emulsions observed in the other Examples.

[0124] Formulation examples of the aerosol cosmetic preparation of the present invention are shown below.

[0125] (Formulation Example 1) Deodorant <Undiluted solution> Aluminum chlorohydrate 20.0% by mass Isopropyl methylphenol 0.1% by mass Dimethicone 40.0% by mass Silicone-coated silica 6.0% by mass Purified water remainder Total 100.0% by mass <Propellant> LPG 100.0% by mass Stock solution:propellant (mass ratio) = 20:80

[0126] (Formulation Example 2) Deodorant <Undiluted solution> Ethanol 10.0% by mass Aluminum chlorohydrate 20.0% by mass Zinc paraphenolsulfonate 0.3% by mass Dimethicone 35.0% by mass Silicone-coated silica 5.0% by mass (Dimethicone / vinyl dimethicone) crosspolymer 1.0% by mass Purified water remainder Total 100.0% by mass <Propellant> LPG 100.0% by mass Stock solution:propellant (mass ratio) = 30:70

Claims

1. An aerosol container; The stock solution, and a propellant; The aerosol container is filled with the concentrate and the propellant, The concentrate is a water-in-oil emulsion composition, The stock solution contains the following component A, the following component B, the following component C, and the following component D, The component B comprises the following component B1: The component D includes the following component D1: a mass ratio of the total content of the component A and the component B to the content of the component C is 3.5 or less; a mass ratio of the total content of the component A and the component B to the content of the component D is 100.0 or less; The mass ratio of the content of the component C to the content of the component D is 1.3 or more, When the component A contains ethanol, the content of the ethanol in 100% by mass of the component A is 60.0% by mass or less, The stock solution does not contain or contains a surfactant, When the concentrate contains the surfactant, the content of the surfactant in 100% by mass of the concentrate is 0.1% by mass or less. Component A: Water, or water and ethanol Ingredient B: Antiperspirant Component B1: An antiperspirant component selected from the group consisting of aluminum chlorohydrate and zinc paraphenolsulfonate. Component C: An oil that is liquid at 25° C. and is selected from the group consisting of silicone oils, hydrocarbon oils, and ester oils. Component D: Hydrophobic powder Component D1: A hydrophobic powder selected from the group consisting of silicone-coated powders and silicone powders.

2. The content of the component A in 100% by mass of the original solution is 10.0% by mass or more, 2. The aerosol cosmetic preparation according to claim 1, wherein when Component A contains ethanol, the content of the ethanol in 100% by mass of Component A is 50.0% by mass or less.

3. The aerosol cosmetic preparation according to claim 1 or 2, wherein the propellant comprises the following component X: Component X: Liquefied gas

4. The aerosol cosmetic preparation according to any one of claims 1 to 3, wherein the content of said component B is 60.0 mass% or less relative to 100 mass% of the total content of said component A and said component B.

5. 5. The aerosol cosmetic preparation according to claim 1, wherein the content of the concentrate is 5.0% by mass or more and 50.0% by mass or less, based on 100% by mass of the total of the concentrate and the propellant.

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