Foaming aerosol cosmetic

Abstract

[Problem] The present invention addresses the problem of providing a foam aerosol cosmetic preparation which is capable of having both good foam retainability and good spreadability, while exhibiting excellent long-term stability even if a large amount of a fine particulate metal oxide is added thereto for the achievement of high ultraviolet light shielding performance.　A foam aerosol cosmetic preparation according to the present invention, which has solved the problem, is characterized by being composed of a propellant and a starting material liquid that is a water-in-oil emulsion composition containing the components (A) to (D) described below. (A) a surface-hydrophobized fine particulate metal oxide in an amount of 10% by mass to 20% by mass in the starting material liquid (B) an oil agent (C) an uncrosslinked polyether-modified silicone (D) a partially crosslinked polyether-modified silicone

Description

Technical Field

[0004] , , , , ,

[0001] The present invention relates to an aerosol-type cosmetic that is discharged in a foamy state.

Background Art

[0002] In recent years, various types of sunscreen cosmetics have been developed. Among them, foamy aerosol-type cosmetics are preferred by general consumers because they are less likely to drip when applied to the palm and provide a light feeling when spreading. They are formed by filling a composition containing an ultraviolet absorber or an ultraviolet scattering agent into an aerosol container together with a pump former or high-pressure liquefied petroleum gas (LPG) to form foam. However, various studies have been conducted to improve the usability and quality. (See, for example, Patent Documents 1 to 4).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0004] In UV-protective cosmetics, it is often necessary to incorporate large amounts of fine metal oxide particles that reflect and scatter ultraviolet rays in order to enhance UV protection. However, when these are stored in the special environment of an aerosol, caking (a state in which the powder particles aggregate and solidify) can occur over time, leading to poor stability such as difficulty in redispersion, and sometimes resulting in an uneven cosmetic film. However, the technologies disclosed in prior literature have not considered the problem of poor stability over time due to caking. Furthermore, they have not been satisfactory in terms of achieving both foam retention and good spreadability.

[0005] Therefore, the objective of the present invention is to provide a foaming aerosol cosmetic that, even when a large amount of fine metal oxide particles are incorporated for UV protection, exhibits excellent stability over time, resulting in high uniformity of the cosmetic film, and further achieves both foam retention and good spreadability. [Means for solving the problem]

[0006] Under these circumstances, the inventors, after diligent research, discovered that by combining a stock solution, which is a water-in-oil emulsion composition containing surface-hydrophobized fine-particle metal oxide and using a specific polyether-modified silicone, with a propellant to form an aerosol, a foamy aerosol cosmetic can be obtained that exhibits excellent powder redispersibility even after prolonged standing, as well as excellent foam retention and spreadability, thus completing the present invention.

[0007] In other words, the present invention provides the following: [1] A foaming aerosol cosmetic comprising a stock solution which is a water-in-oil emulsion composition containing the following components (A) to (D), and a propellant. (A) Surface hydrophobically treated fine metal oxides in 10-20% by mass of the stock solution (B) Oils (C) Non-crosslinked polyether-modified silicone (D) Partially cross-linked polyether-modified silicone [2] The foam aerosol cosmetic composition according to [1], wherein the ratio of the stock solution to the propellant is 85:15 to 98:2. [3] The foaming aerosol cosmetic composition according to [1] or [2], wherein the content of component (B) in the undiluted solution is 30 to 55% by mass. [Effects of the Invention]

[0008] The foamy aerosol cosmetic composition of the present invention is less prone to solidification of fine metal oxide particles even after prolonged standing and exhibits excellent redispersibility, allowing for long-term storage and use. Furthermore, even when a large amount of fine metal oxide particles are incorporated, the foamy aerosol cosmetic composition of the present invention does not exhibit powder aggregation, forming a soft and fine foam with smooth spreadability and excellent uniformity of the cosmetic film. Moreover, it achieves both foam retention and good spreadability, resulting in excellent usability. Therefore, it is useful as a sunscreen cosmetic with high UV protection and as a makeup cosmetic. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below. However, the present invention is not limited to the embodiments described below. In this specification, "X~Y" indicating a range includes X and Y, and means "X or greater and Y or less".

[0010] <Stock solution: water-in-oil emulsion composition> (Component (A): Surface hydrophobized fine particle metal oxide) Component (A) used in the present invention is obtained by coating the surface of fine metal oxide particles with a hydrophobic treatment agent, thereby improving its dispersibility in the oil phase.

[0011] In component (A), the fine metal oxides that can be surface hydrophobicated are not particularly limited as long as they are commonly used in cosmetics and the like, but examples include zinc oxide, titanium oxide, cerium oxide, zirconium oxide, and iron oxide. Among these, from the viewpoint of having a high effect in blocking ultraviolet rays by absorbing, scattering, reflecting, and quenching a wide range of ultraviolet rays, it is preferable to use one or more selected from zinc oxide, titanium oxide, and cerium oxide, more preferably zinc oxide and / or titanium oxide, and even more preferably zinc oxide.

[0012] Furthermore, the shape of the fine metal oxide particles is not particularly limited, but examples include granular, spherical, spindle-shaped, dendritic, balloon-shaped, etc., and from the viewpoint of reducing white cast by improving dispersibility in the composition, UV protection effect, and water resistance, granular, spherical, and spindle-shaped particles are preferred.

[0013] While there are no particular limitations on the particle size of the fine metal oxide particles, from the viewpoint of reducing white cast, UV protection, and water resistance, the average particle size is preferably 1 nm to 300 nm, more preferably 5 nm to 100 nm, and even more preferably 10 nm to 50 nm. In this invention, the average particle size is measured as the volume-average particle size (D50) using a laser scattering particle size analyzer (manufactured by HORIBA).

[0014] The surface hydrophobic treatment agent for component (A) is not particularly limited as long as it is commonly used in cosmetics and the like, but examples include silicone treatment agents, fluorine treatment agents, organic titanate treatment agents, fatty acid treatment agents, and acyl amino acid treatment agents. Among these, from the viewpoint of water resistance and long-term stability, it is preferable to use one or more selected from silicone treatment agents and organic titanate treatment agents.

[0015] Examples of silicone treatment agents include chain-like silicones such as low-molecular-weight dimethylpolysiloxane, high-molecular-weight dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane; modified silicones such as amino-modified silicones, alkyl-modified silicones, and alkoxy-modified silicones; silicone resins such as trimethylsiloxysilicate and acrylic-silicone graft copolymers; silicone rubbers; partially or fully crosslinked organopolysiloxanes; silylation agents; and silane coupling agents. One or more selected from these can be used. Among these, the use of silane coupling agents is preferred.

[0016] Among silane coupling agents, trialkoxyalkylsilanes are preferred, although they are not particularly limited. Triakoxyalkylsilanes are compounds in which three alkoxy groups and one alkyl group are bonded to a silicon atom, and these alkoxy groups react with hydroxyl groups and other elements on the powder surface to chemically modify the powder surface. In the trialkoxyalkylsilane, the alkoxy groups are preferably alkoxy groups having 1 to 3 carbon atoms, such as methoxy, ethoxy, and propoxy groups. In the trialkoxyalkylsilane, the alkyl group is preferably an alkyl group having 6 to 18 carbon atoms, such as hexyl, octyl, decyl, and octadecyl groups. Specific examples of such trialkoxyalkylsilanes include trimethoxyhexylsilane, trimethoxyoctylsilane, trimethoxydecylsilane, trimethoxyoctadecylsilane, triethoxyhexylsilane, triethoxyoctylsilane, triethoxydecylsilane, and triethoxyoctadecylsilane. Among these, from the viewpoint of stability over time and ease of use such as smooth spreading without friction, it is more preferable to use one or more selected from trimethoxyoctylsilane and triethoxyoctylsilane.

[0017] Examples of the organic titanate treatment agent include alkyl titanates such as long-chain carboxylic acid type, pyrophosphoric acid type, phosphorous acid type, and amino acid type, and alkyl titanates having an alkyl group with 8 to 24 carbon atoms are preferred. Specifically, examples of the alkyl titanate include, as the long-chain carboxylic acid type alkyl titanate, isopropyl triisostearoyl titanate, isopropyl trioctanoyl titanate, isopropyl dimethacryloyl isostearoyl titanate, isopropyl isostearoyl diacryl titanate, diisostearoyl ethylene titanate, etc.; as the pyrophosphoric acid type alkyl titanate, tetra isopropyl bis(dioctyl phosphite) titanate, tetra octyl bis(ditridecyl phosphite) titanate, tetra(2,2-diallyloxymethyl-1-butyl) bis(ditridecyl phosphite) titanate, etc.; as the phosphorous acid type alkyl titanate, isopropyl tri(dioctyl pyrophosphate) titanate, bis(dioctyl pyrophosphate) oxyacetate titanate, bis(dioctyl pyrophosphate) ethylene titanate, etc.; and as the amino acid type alkyl titanate, isopropyl tri(N-amidoethyl·aminoethyl) titanate, etc. Among these alkyl titanates, from the viewpoints of stability over time and water resistance, etc., long-chain carboxylic acid type alkyl titanates are preferred, and isopropyl triisostearoyl titanate is more preferred.

[0018] The coating amount of the surface hydrophobization treatment agent in component (A) is not particularly limited, but from the viewpoints of water resistance and stability over time, the upper limit is preferably 60% by mass or less (hereinafter simply abbreviated as "%"), more preferably 40% or less, even more preferably 20% or less, and the lower limit is preferably 2% or more, more preferably 5% or more, and even more preferably 10% or more, based on the mass of the particulate metal oxide before treatment.

[0019] The method of surface treatment in component (A) is not particularly limited and can be produced by a commonly known method. For example, a surface treatment agent and powder particles to be treated are added to a solvent, stirred using a ball mill or the like, dried if necessary, washed with water and filtered repeatedly to remove impurities, and then dried and pulverized to obtain the desired surface-treated powder. Also, several types of compounds that are surface treatment agents can be surface-treated simultaneously, or surface treatment can be performed with one of the compounds first and then with other compounds.

[0020] In the present invention, the content of component (A) in the undiluted solution, which is a water-in-oil type emulsion composition, is 10 to 20%. If it is less than 10%, the ultraviolet protection effect may not be obtained, and if it exceeds 20%, the stability over time and spreading may be inferior. Further, component (A) is preferably 12% or more in the undiluted solution, more preferably 13% or more. Also, component (A) is preferably 18% or less in the undiluted solution, more preferably 17% or less.

[0021] (Component (B): oil agent) The component (B) oil used in the present invention is not particularly limited as long as it is commonly used in cosmetics, etc., and can be hydrocarbons, oils and fats, waxes, esters, fatty acids, silicone oils, fluorinated oils, etc., regardless of its properties such as solid, paste, or liquid, its physical properties such as polarity or nonpolarity, or its origin such as vegetable oil, mineral oil, or synthetic oil. Specifically, hydrocarbons such as isododecane, isohexadecane, light isoparaffin, liquid paraffin (mineral oil), squalane, squalene, α-olefin oligomer, polybutene, liquid isoparaffin, heavy liquid isoparaffin, polyisobutylene, hydrogenated polyisobutene; rapeseed oil, avocado oil, almond oil, apricot kernel oil, perilla oil, orange oil, olive oil, kiwi seed oil, sesame oil, wheat germ oil, rice germ oil, rice bran oil, safflower oil, sesame Oils and fats such as senna oil, soybean oil, tea seed oil, corn oil, rapeseed oil, evening primrose oil, camellia oil, peach kernel oil, Job's tears oil, peanut oil, sunflower oil, grape seed oil, meadowfoam oil, rosemary oil, jojoba oil, macadamia nut oil, lavender oil, rosehip oil, mink oil, etc.; glyceryl tri-2-ethylhexanoate, isotridecyl isononanoate, isononyl isononanoate, cetyl 2-ethylhexanoate, isopropyl myristate, isopropyl palmitate 2-ethylhexyl palmitate, octyldodecyl myristate, glyceryl trioctanoate, caprylic / capric triglyceride, glyceryl diisostearate, glyceryl triisostearate, decaglyceryl decaisostearate (polyglyceryl-10 decaisostearate), propylene glycol dicaprate, propylene glycol dicaprylate / caprate, neopentyl glycol dicaprate, poly(poly) triisostearate Esters such as glyceryl, diisostearyl malate, neopentyl glycol diethylhexanoate, pentaerythritol tetraisostearate, pentaerythritol tetra-2-ethylhexanoate, dipentaerythritol pentaisostearate, dialkyl carbonate, bisethoxydiglycol cyclohexane-1,4-dicarboxylic acid, dimer dilinoleyl hydrogenated rosin condensate, and alkyl (C12-15) benzoate; fatty acids such as oleic acid and isostearic acid;Examples include higher alcohols such as oleyl alcohol, 2-octyldodecanol, 2-decyltetradecanol, isostearyl alcohol, and 2-hexyldecanol; silicone oils such as dimethylpolysiloxane (dimethicone), methyl trimethicone, methylphenylpolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, tetramethyltetrahydrogencyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetratrifluoropropylcyclotetrasiloxane, pentamethylpentatrifluoropropylcyclopentasiloxane, polyether-modified methylpolysiloxane, oleyl-modified methylpolysiloxane, and polyvinylpyrrolidone-modified methylpolysiloxane; fluorinated oils such as perfluoropolyether, perfluorodecane, and perfluorooctane; lanolin derivatives such as lanolin acetate, isopropyl lanolin fatty acid, and lanolin alcohol; and oil-soluble ultraviolet absorbers. One or more of these can be used. ;

[0022] Component (B) preferably contains an ester oil from the viewpoint of solubility of the UV absorber described later and the feel of use, and more preferably contains one or more selected from propylene glycol dicaprate, alkyl (C12-15) benzoate, di(caprylic / capric acid) propylene glycol, and cetyl 2-ethylhexanoate.

[0023] Component (B) may include an oil-soluble UV absorber, and is not particularly limited as long as it is commonly used in cosmetics, etc., and may be in solid, paste, or liquid form. Specifically, for example, 2-hydroxy-4-methoxybenzophenone, 2,4,6-trianilino-p-(carbo-2'-ethylhexyl-1'-oxy)-1,3,5-triazine, 2-ethylhexyl salicylate, paradihydroxypropyl ethyl benzoate, ethylhexyl methoxycinnamate, 4-tert-4'-methoxydibenzoylmethane, 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate (diethylamino hydroxybenzoyl hexyl benzoate), polysyl Examples include Lycorn-15, 2-ethylhexyl dimethoxybenzylidene dioxoimidazolidine propionate, 2,2'-methylenebis[6-(2H-benzotriazole-2yl)-4-(1,1,3,3-tetramethylbutyl)phenol], 2,4-bis[{4-(2-ethylhexyloxy)-2-hydroxy}phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine (bisethylhexyloxyphenol methoxyphenyl triazine), dimethicone diethyl benzalmalonate, etc. From the viewpoint of UV protection effect, one or more selected from the group consisting of ethylhexyl methoxycinnamate (2-ethylhexyl paramethoxycinnamate), 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate, 2,4-bis[{4-(2-ethylhexyloxy)-2-hydroxy}phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, and 4-tert-butyl-4'-methoxydibenzoylmethane is more preferable.

[0024] The content of component (B) in the present invention is not particularly limited, but in the stock solution, which is a water-in-oil emulsion composition, the lower limit is preferably 30% or more, and more preferably 40% or more. The upper limit is preferably 55% or less, and more preferably 50% or less. This range is preferable because it provides better stability over time and good spreadability.

[0025] (Component (C): Non-crosslinked polyether-modified silicone) The component (C) non-crosslinked polyether-modified silicone used in the present invention is a copolymer having at least organopolysiloxane groups and a plurality of hydrophilic groups having ether structures. It may be a graft copolymer having organopolysiloxane groups as the main chain and hydrophilic groups as side chains, or a linear block copolymer in which organopolysiloxane groups and hydrophilic groups are alternately bonded, but it does not contain any crosslinking structures within the molecule. The organopolysiloxane groups may be linear or have a branched structure, and examples of the hydrophilic groups include polyoxyalkylene groups and polyglyceryl groups.

[0026] Among the aforementioned graft copolymer types, those having a linear organopolysiloxane group as the main chain include, specifically, polyoxyalkylene-modified organopolysiloxanes (commercially available, for example, "KF-6017" which is PEG10-dimethicone, manufactured by Shin-Etsu Chemical Co., Ltd.) and polyoxyalkylene-alkyl copolymerized organopolysiloxanes (commercially available, for example, "5200 Formulation Aid" which is lauryl PEG / PPG-18 / 18 methicone, manufactured by Toray Dow Corning Co., Ltd.). Furthermore, examples of silicones with a branched organopolysiloxane group as the main chain (silicone-branched polyether-modified silicones) include PEG-9 polydimethylsiloxyethyl dimethicone (commercially available, for example, "KF-6028" manufactured by Shin-Etsu Chemical Co., Ltd.) and lauryl PEG-9 polydimethylsiloxyethyl dimethicone (commercially available, for example, "KF-6038" manufactured by Shin-Etsu Chemical Co., Ltd.).

[0027] Examples of the aforementioned block copolymer types include polyoxyethylene-butylene-dimethylpolysiloxane copolymer (commercially available, for example, "FZ-2250" manufactured by Toray Dow Corning), and polyoxyethylene-polyoxypropylene-butylene-dimethylpolysiloxane copolymer (commercially available, for example, "FZ-2233" manufactured by Toray Dow Corning, and "SILWET 236-L" manufactured by Nippon Unicar Co., Ltd.).

[0028] Component (C) may be used in one or more forms as needed, but among these, a graft copolymer type is preferred, and as the hydrophilic group, a polyoxyalkylene chain is preferred, a polyoxyethylene chain is particularly preferred, and a non-crosslinked polyether-modified silicone in which the degree of polymerization of oxyethylene is 7 to 11 is particularly preferred. Furthermore, as the organopolysiloxane group, one having a branched structure is preferred, and it is even more preferable to use both a linear structure and a branched structure in combination. In addition, the average HLB of component (C) is preferably 1 to 7, and more preferably 2.5 to 5. In this invention, HLB (Hyrdrophile-Lipophile Balance) is an index that shows the balance of hydrophilicity-lipophilicity, and is calculated by the following formula (Formula 1) by Oda and Teramura et al., and the average HLB is the weighted average value. HLB = "Inorganic value (IV) / Organic value (OV)" × 10 ... (Equation 1) (See Yoshio Koda, "Organic Concept Diagrams - Fundamentals and Applications," pp. 11-17, Sankyo Publishing, 1984)

[0029] The content of component (C) in the present invention is not particularly limited, but in the water-in-oil emulsion stock solution, the lower limit is preferably 0.1% or more, and more preferably 0.2% or more, from the viewpoint of long-term stability and foam retention. The upper limit is preferably 3% or less, and more preferably 2% or less, from the viewpoint of spreadability.

[0030] (Component (D): Partially cross-linked polyether-modified silicone) The component (D) cross-linked polyether-modified silicone used in the present invention is a polymer obtained by three-dimensionally cross-linking organopolysiloxanes, in which hydrophilic groups such as polyoxyalkylene groups or polyglycerin groups are introduced into the molecule, and may further be co-modified with organic groups such as alkyl groups.

[0031] Component (D) is not particularly limited, but examples include partially crosslinked polyether-modified silicones such as (dimethicone / (PEG-10 / 15)) crosspolymer, partially crosslinked alkyl-polyether copolymerized silicones such as (PEG-15 / lauryl dimethicone) crosspolymer, partially crosslinked polyglycerin-modified silicones such as (dimethicone / polyglycerin-3) crosspolymer, and partially crosslinked alkyl-polyglycerin copolymerized silicones such as (lauryl dimethicone / polyglycerin-3) crosspolymer, and one or more of these can be used.

[0032] Such components (D) are commercially available in the form of mixtures with silicone oils, including "KSG-210" (solids content 20-30%) as a mixture of partially crosslinked polyether-modified silicone and dimethylpolysiloxane, and "KSG-310" (solids content 25-35%), "KSG-320" (solids content 20-30%), "KSG-330" (solids content 15-25%) and "KSG-340" (solids content 2%) as mixtures of partially crosslinked alkyl-polyether-modified silicone and oils. Examples include "KSG-710" (solids content 20-30%), a mixture of partially cross-linked polyglycerin-modified silicone and dimethylpolysiloxane (5-35%), and "KSG-810" (solids content 25-35%), "KSG-820" (solids content 20-30%), "KSG-830" (solids content 15-25%), and "KSG-840" (solids content 25-35%) (all manufactured by Shin-Etsu Chemical Co., Ltd.), which are mixtures of partially cross-linked alkyl-polyglycerin-modified silicone and oil.

[0033] The content of component (D) in the present invention is not particularly limited, but in the stock solution, which is a water-in-oil emulsion composition, it is preferably at a lower limit of 0.05% or more, more preferably at a lower limit of 0.1% or more, on a solid content basis. Furthermore, it is preferably at an upper limit of 5% or less, and more preferably at a lower limit of 3% or less. Component (D) within this range is preferable because it allows for a lighter spread, greater stability over time, and superior foam retention.

[0034] Since the stock solution of the present invention is a water-in-oil emulsion composition, in addition to the above-mentioned components, aqueous components such as water and lower alcohols may be included as components constituting the aqueous phase, as necessary, within a quantitative and qualitative range that does not impair the effects of the present invention. For example, surfactants other than component (C) and component (D), powders other than component (A), water-soluble polymers, film-forming agents, antioxidants, pH adjusters, chelating agents, cosmetic ingredients, preservatives, fragrances, cooling agents, etc., may be included.

[0035] The aqueous component can be any water or water-soluble component, such as glycols including propylene glycol, 1,3-butylene glycol, dipropylene glycol, and polyethylene glycol; glycerols including glycerin, diglycerin, and polyglycerin; sugar alcohols including sorbitol, maltitol, and glucose; lower alcohols including ethanol; and glycerin derivatives such as polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether (3BO)(8EO)(5PO) and polyoxypropylene (9) diglyceryl.

[0036] The method for producing the stock solution of the present invention is not particularly limited and can be prepared by conventional methods. For example, a portion of component (B) and component (A) can be kneaded in advance using a roll mill or bead mill, the remainder of component (B), components (C) and (D) can be added, and the mixture can be heated and mixed to obtain a uniform dispersion. Then, an aqueous component can be added and emulsified to obtain a water-in-oil composition.

[0037] <propellant> The propellant used in the present invention contains a liquefied gas obtained by liquefying a gas that is a gas at atmospheric pressure under high pressure. It is not particularly limited as long as it is commonly used in cosmetics and the like, but examples include hydrocarbons having 2 to 5 carbon atoms, dimethyl ether, diethyl ether, and other ethers. Specific examples of hydrocarbons having 2 to 5 carbon atoms include ethane, propane, n-butane, isobutane, n-pentane, isopentane, and neopentane. Among these, liquefied petroleum gas (LPG) mainly composed of propane and butane is preferred, and it is preferable to use LPG adjusted to a pressure of 0.3 to 0.8 MPa at 20°C. By using liquefied gas adjusted to a pressure within this range, foam retention can be improved.

[0038] In addition to the liquefied gas mentioned above, the propellant of the present invention may contain carbon dioxide, nitrogen, argon, etc., to the extent that it does not hinder the effects of the present invention.

[0039] <Foaming aerosol cosmetic> In the foaming aerosol cosmetic composition of the present invention, the filling ratio of the stock solution to the propellant is preferably 85:15 to 98:2 by mass, and more preferably 90:10 to 96:4. This range is preferable because it provides excellent stability even after prolonged standing and good foam retention.

[0040] The method for filling the foaming aerosol cosmetic of the present invention is not particularly limited, but involves filling a stock solution prepared by a conventional method into a pressure-resistant container, attaching an aerosol valve to the container, and then injecting a propellant through the valve. Furthermore, an aerosol product can be made by attaching a spray member according to the purpose to the aerosol valve.

[0041] The foamy aerosol cosmetic composition of the present invention has an ultraviolet protection effect and can therefore be used as a makeup base, foundation, daytime beauty serum, sunscreen, and the like. [Examples]

[0042] Examples 1-11 and Comparative Examples 1-3: Foaming Aerosol Sunscreens Foaming aerosol sunscreens with the compositions shown in Table 1 below were prepared using the manufacturing method described below. Foam retention, stability over time, and spreadability were evaluated using the evaluation methods and criteria described below, and the results are also shown in Table 1.

[0043] [Table 1]

[0044] (Note 1) KF-6017 (manufactured by Shin-Etsu Chemical Co., Ltd.) (Note 2) KF-6028 (manufactured by Shin-Etsu Chemical Co., Ltd.) (Note 3) KSG-210 (manufactured by Shin-Etsu Chemical Co., Ltd.): Solids content 20-30% (Note 4) KSG-710 (manufactured by Shin-Etsu Chemical Co., Ltd.): Solids content 20-30% (Note 5) KSG-310 (manufactured by Shin-Etsu Chemical Co., Ltd.): Solid content 25-35% (Note 6) Leopard ISK2 (manufactured by Chiba Flour Milling Co., Ltd.) (Note 7) KP-545 (manufactured by Shin-Etsu Chemical Co., Ltd.)

[0045] (Manufacturing method) (Examples 1-11 and Comparative Examples 1-3) A: Mix and dissolve ingredients (4) to (11), (14) to (16), (19), and (20) uniformly. B: Distribute half of components (1) to (3) and components (12) and (13) uniformly. Add B to C:A and mix and disperse uniformly. Add the remaining amounts of components (17), (18), and (12), (13) to D:C and mix and disperse uniformly. E: Mix ingredients (21) to (24) uniformly. E is added to F:D and emulsified to obtain a water-in-oil emulsion composition. After filling 100 parts of G:F into an aerosol-type pressure container, 5 parts of liquefied petroleum gas (0.4 MPa) were added as a propellant to obtain a foamy aerosol-type sunscreen.

[0046] (Evaluation method: (a) Foam retention) For the foam aerosol sunscreens of Examples 1-11 and Comparative Examples 1-3, the foam state was observed over time when a ping-pong ball-sized amount was sprayed onto the palm of the hand at a distance of 2 cm from the aerosol nozzle, and the results were evaluated according to the following evaluation criteria. [Evaluation Criteria] (Evaluation) : (Judgment) At the point 30 seconds after spraying, The appearance of the foam immediately after spraying is maintained: ◎ At the point 20 seconds after spraying, The appearance of the foam immediately after spraying is maintained: ○ At the point 10 seconds after spraying, The appearance of the foam immediately after spraying is maintained: △ Within 10 seconds after spraying, the appearance of the foam changes noticeably. Not maintained: ×

[0047] (Evaluation method: (b) Stability over time) The foamy aerosol sunscreens of Examples 1-11 and Comparative Examples 1-3, filled into transparent glass pressure-resistant containers, were stored at 40°C for one month. After returning to room temperature, they were shaken 30 times, and the redispersion state of the powder in the contents (absence of caking) was observed and evaluated according to the following evaluation criteria. [Evaluation Criteria] (Evaluation) : (Judgment) The whole is redistributed uniformly: ◎ Although trace amounts of undispersed powder are present, it redisperses well: ○ Undispersed powder particles are present: △ Obvious caking is observed: ×

[0048] (Evaluation method: (c) Ability to expand and grow) Ten cosmetic evaluation panel members were asked to use the foam aerosol sunscreens of Examples 1-11 and Comparative Examples 1-3 (spraying an amount about the size of a ping-pong ball onto their palm and then applying it to their forearms). Each member evaluated the smooth application of each sample on a 5-point scale according to the evaluation criteria below, assigning a score to each sample. The average score of all panel members was then used to determine the final result according to the judgment criteria below. [Evaluation Criteria] (Rating): (Result) 5 points: very good 4 points: Good 3 points: Average 2 points: Slightly poor 1 point: Defective [Judgment criteria] (Average score): (Judgment) 4.5 points or higher: ◎ 3.5 points or higher but less than 4.5 points: ○ 2.5 points or higher but less than 3.5 points: △ 1.0 or higher but less than 2.5 points: ×

[0049] As is clear from the results in Table 1, the foamy aerosol sunscreens of Examples 1 to 11 all exhibited excellent foam retention and good stability over time, allowing them to be used in a fine foam state until the very end. They also spread smoothly and provided excellent UV protection. On the other hand, Comparative Example 1, which contained an excess of component (A), suffered from caking and performed poorly in all evaluation items. Comparative Example 2, which did not contain component (C), also suffered from caking and performed poorly in terms of foam retention and stability over time. Furthermore, Comparative Example 3, which did not contain component (D), had insufficient emulsifying power, resulting in poor foam retention, and also performed poorly in terms of spreadability.

[0050] Example 12: Non-chemical sunscreen (Ingredients) (%) (1) Triethoxyoctylsilane-treated zinc oxide (Note 8) 20 (2) Stearic acid-treated titanium dioxide (Note 9) 5 (3) Polyhydroxystearic acid 0.3 (4) PEG-9 polydimethylsiloxyethyl dimethicone (Note 2) 0.2 (5) Cetyl ethylhexanoate 15 (6) Dimethicone (6CS) 5 (7) Diphenyl dimethicone (Note 10) 5 (8) Diphenylsiloxyphenyl trimethicone (Note 11) 5 (9) PEG-10 Dimethicone (Note 12) 0.7 (10) (Dimethicone / (PEG-10 / 15)) Crosspolymer (Note 3) 1 (11) Talc 5 (12) Mica 1 (13) Ethanol 7 (14) Purified water remaining amount (15) Sodium chloride 0.3 (16) 1,3-Butylene glycol 5 (17) Glycerin 1 (18) Dipropylene glycol 0.5 (19) Hyaluronic acid 0.15 (20) Trehalose 0.05 (21) Artemisia capillaris extract 0.01 (22) Phenoxyethanol 0.3

[0051] (Note 8) MZX-508OTS (manufactured by Teika Co., Ltd.) (Note 9) MT-01 (manufactured by Teika Co., Ltd.) (Note 10) KF-54 (manufactured by Shin-Etsu Chemical Co., Ltd.) (Note 11) KF-56 (manufactured by Shin-Etsu Chemical Co., Ltd.) (Note 12) KF-6017P (manufactured by Shin-Etsu Chemical Co., Ltd.)

[0052] (Manufacturing method) A: Mix and disperse ingredients (7) to (10) uniformly. B: Disperse components (1) to (6) uniformly in powder form. Add B to C:A and mix and disperse uniformly. Add components (11) and (12) to D:C and mix and disperse uniformly. E: Mix ingredients (13) to (22) uniformly. E is added to F:D and emulsified to obtain a water-in-oil emulsion composition. After filling 90 parts of G:F into an aerosol-type pressure container, 10 parts of liquefied petroleum gas (0.4 MPa) were added as a propellant to obtain a non-chemical sunscreen.

[0053] The non-chemical sunscreen of Example 12 exhibited excellent stability over time, combined good foam retention and spreadability, resulting in a uniform cosmetic film and superior UV protection.

[0054] Example 13: Primer Cosmetics (Ingredients) (%) (1) Triethoxyoctylsilane (4%) treated zinc oxide (35 nm) 15 (2) PEG-9 polydimethylsiloxyethyl dimethicone (Note 2) 0.5 (3) Cetyl ethylhexanoate 15 (4) Dimethicone (6CS) 5 (5) Diphenyl dimethicone (Note 10) 5 (6) Diphenylsiloxyphenyl trimethicone (Note 11) 5 (7) PEG-10 Dimethicone (Note 12) 0.7 (8) (Dimethicone / (PEG-10 / 15)) crosspolymer (Note 10) 1 (9) Dimethicone (2%) treated talc 5 (10) Mica 1 (11) Ethanol 7 (12) Purified water remaining amount (13) Sodium chloride 0.3 (14) 1,3-Butylene glycol 5 (15) Glycerin 1 (16) Phenoxyethanol 0.3 (17) Red 226 0.01 (18) Ultramarine 0.05

[0055] (Manufacturing method) A: Mix and disperse components (5) to (8) uniformly. B: Disperse components (1) to (4) uniformly in powder form. Add B to C:A and mix and disperse uniformly. Add components (9) and (10) to D:C and mix and disperse uniformly. E: Mix ingredients (11) to (18) uniformly. E is added to F:D and emulsified to obtain a water-in-oil emulsion composition. After filling 95 parts of G:F into an aerosol-type pressure-resistant container, 5 parts of liquefied petroleum gas (0.4 MPa) were added as a propellant to obtain a base cosmetic.

[0056] The base cosmetic of Example 13 exhibited excellent stability over time, a uniform cosmetic film due to its combination of foam retention and spreadability, and superior UV protection.

Claims

1. A foaming aerosol cosmetic comprising a stock solution which is a water-in-oil emulsion composition containing the following components (A) to (D), and a propellant, wherein the ratio of stock solution to propellant is 85:15 to 98:

2. (A) Surface hydrophobized fine particle metal oxide 10 to 20% by mass in the stock solution (B) Oil (C) Non-crosslinked polyether-modified silicone (D) Partially cross-linked polyether-modified silicone

2. The foaming aerosol cosmetic composition according to claim 1, wherein the content of component (B) in the undiluted solution is 30 to 55% by mass.

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