Aerosol compositions and aerosol products

Abstract

To provide an aerosol composition which has good dispersion stability even if an oily component is incorporated in a large amount, has a wide spray pattern even if the internal pressure becomes low, can spray fine droplets, can reduce spray noise and substantially contains no surfactant.SOLUTION: There is provided an aerosol composition which comprises water, an oily component and a water-soluble polymer, where the water-soluble polymer includes at least one selected from the group consisting of polyvinyl alcohol and polyvinylpyrrolidone, the content of the water-soluble polymer in the aerosol composition is 0.01 mass% to 2.5 mass%, the aerosol composition forms an emulsion, the average particle diameter of droplets of the emulsion is 0.5 μm to 7.0 μm and the aerosol composition substantially contains no surfactant.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to aerosol compositions that are substantially surfactant-free. [Background technology]

[0002] Emulsions are widely used in foods, cosmetics, pharmaceuticals, etc., and it is widely known that surfactants are used as emulsifiers to stabilize the dispersion of emulsions. However, in recent years, with the growing trend toward natural products, there has been an increasing demand for emulsifier (surfactant)-free products in order to reduce the burden on the human body, such as irritation caused by surfactants, and to conserve resources.

[0003] For example, Patent Document 1 proposes a technology for adding a surface-inactive substance as a water-soluble additive that stabilizes the dispersion of a water-in-oil (W / O) emulsion, in which the dispersoid is water and the dispersion medium is oil. Patent Document 2 also discloses an emulsion that contains an oil phase and a water phase but does not contain an emulsifier. The application of this emulsion to an aerosol product enables a spray with a wide spray angle and a soft feel on the skin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-165716 [Patent Document 2] Japanese Patent Application Publication No. 2019-064971 Summary of the Invention [Problem to be solved by the invention]

[0005] Meanwhile, due to diversifying customer needs in the cosmetics market, etc., there is an increasing demand for O / W emulsions containing a large amount of oily components. However, with the emulsion of Patent Document 2, it is difficult to increase the oily component content to, for example, around 10% by mass. Another method is to use a water-soluble polymer instead of a surfactant to stabilize the dispersion of an O / W emulsion, but this increases the viscosity of the emulsion, narrowing the spray pattern when made into an aerosol product and making it difficult to spray fine droplets. Furthermore, when an O / W emulsion is sprayed using an aerosol product, if it contains a surfactant, there is a problem that the spray noise becomes loud.

[0006] In view of these problems, the present disclosure provides an aerosol composition and an aerosol product that are substantially free of surfactants, have good dispersion stability even when a large amount of oily component is contained, enable spraying of fine droplets over a wide spray pattern even when the internal pressure is low, and can reduce spray noise. [Means for solving the problem]

[0007] The present disclosure provides an aerosol composition containing water, an oily component, and a water-soluble polymer, the water-soluble polymer comprises at least one selected from the group consisting of polyvinyl alcohol and polyvinylpyrrolidone; the content of the water-soluble polymer in the aerosol composition is 0.01% by mass to 2.5% by mass; The aerosol composition forms an emulsion, The emulsion droplets have an average particle size of 0.5 μm to 7.0 μm, The aerosol composition is characterized by being substantially free of surfactants. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide an aerosol composition and an aerosol product that are substantially free of surfactants, have good dispersion stability even when a large amount of oily components are contained, enable the spraying of fine droplets over a wide spray pattern even when the internal pressure is low, and can reduce spray noise. DETAILED DESCRIPTION OF THE INVENTION

[0009] Unless otherwise specified, the expressions "XX to YY" or "XX to YY" representing a numerical range mean a numerical range including the lower and upper limits, which are the endpoints. When a numerical range is described in stages, the upper and lower limits of each numerical range can be combined in any way. In the present disclosure, a surfactant refers to an amphiphilic substance having within its molecule a hydrophilic portion that is compatible with water and a hydrophobic portion that is compatible with hydrophobic substances (i.e., a distinct hydrophilic head group and a hydrophobic tail group), and is capable of adsorbing to the water-hydrophobic substance interface by the hydrophilic portion interacting with water and the hydrophobic portion interacting with the hydrophobic substance, thereby significantly reducing the interfacial tension at the water-hydrophobic substance interface and improving the dispersion stability of emulsions and suspensions.

[0010] Examples include sodium lauryl sulfate, stearyl trimethylammonium chloride, glyceryl stearate, polyglyceryl-10 diisostearate, polyoxyethylene coconut oil fatty acid glyceryl, sorbitan laurate, polysorbate 80, polyoxyethylene hydrogenated castor oil, polyoxyethylene lauryl ether, PEG 45 stearate, coconut oil fatty acid sodium methyl taurate, and lauryl dimethylaminoacetate betaine.

[0011] Other surfactants include the following: Anionic surfactants include fatty acid salts, alkyl phosphates, polyoxyethylene alkyl ether phosphates, alkyl sulfates, polyoxyethylene alkyl ether sulfates, alkyl ether carboxylates, alkyl sulfosuccinates, N-acylamino acid salts, N-acylmethylamino acid salts, acyl lactates, α-olefin sulfonates, α-sulfofatty acid methyl ester salts, alkyl sulfosuccinates, alkanesulfonates, alkene sulfonates, acyl isethionates, alkyl sulfate ester salts, alkylbenzene sulfonates, fatty acid alkanolamide sulfate esters, monoacylglycerin sulfate esters, alkyl phosphate ester salts, and polyoxyethylene alkyl phenyl ether phosphate salts. Cationic surfactants include fatty acid amidoamine salts, ester-containing tertiary amine salts, Arcobel-type tertiary amine salts, monoalkyl quaternary ammonium salts, dialkyl quaternary ammonium salts, trialkyl quaternary ammonium salts, alkylamine salts, monoalkyl ether-type quaternary ammonium salts, alkylpyridinium salts, alkylisoquinolium salts, benzethonium chloride, and benzalkonium-type quaternary ammonium salts.

[0012] Nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene castor oil, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyglycerin fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene hydrogenated castor oil fatty acid esters, monoglycerin fatty acid esters, diglycerin fatty acid esters, sucrose fatty acid esters, polyethylene glycol fatty acid esters, alkyl polyglucosides, polyoxyalkylene sterol ethers, polyoxyethylene alkylamines, alkyl alkanolamides, alkyl glyceryl ethers, and Pluronic surfactants.

[0013] Examples of amphoteric surfactants include glycine-type amphoteric surfactants, aminopropionic acid-type amphoteric surfactants, acetate betaine-type amphoteric surfactants, imidazoline-type amphoteric surfactants, alkyl betaines, amido betaines, sulfobetaines, alkylamine oxides, alkyldimethylamine oxides, amino acetate betaines, alkyldimethylamino acetate betaines, alkylcarboxymethyl hydroxyethyl imidazolium betaines, alkylamidopropyl betaines, alkylhydroxysulfobetaines, alkyl sulfobetaines, amidosulfobetaines, and fatty acid amidopropyl betaines. Other examples include silicone surfactants such as polyether-modified silicone, amino-modified silicone, and polyglycerin-modified silicone; fluorine-based surfactants; and natural surfactants such as lecithin, saponin, bile acid, surfactin, spiculisporic acid, agaritic acid, long-chain dicarboxylic acids, rhamnolipid, trehalose lipid, succinoyl trehalose lipid, oligosaccharide fatty acid ester, and glycosyl lipid.

[0014] The aerosol composition is substantially free of surfactants. In the present disclosure, "substantially free of surfactants" means that no surfactants are intentionally added to the aerosol composition, although it may contain trace amounts of surfactants that are inevitably mixed in during the production of the aerosol composition. For example, it may contain surfactants that are incidental to the formulated components and are present in the aerosol composition in amounts less than the amount at which their effect is exerted (so-called carryover components). For example, the content of surfactants in the aerosol composition is less than 0.10% by mass, preferably 0.05% by mass or less, more preferably 0.01% by mass or less, even more preferably 0.001% by mass or less, and particularly preferably 0% by mass.

[0015] Each component used in the aerosol composition will be described below. The aerosol composition contains an oily component. The aerosol composition forms an emulsion. The aerosol composition is preferably an oil-in-water (O / W) emulsion in which an oil phase containing the oily component is dispersed in an aqueous phase containing water. The content of the oily component in the aerosol composition is preferably more than 1.0% by mass and not more than 35.0% by mass, more preferably more than 1.0% by mass and not more than 30.0% by mass, even more preferably more than 1.0% by mass and not more than 20.0% by mass, still more preferably 2.0 to 15.0% by mass, especially preferably 5.0 to 12.0% by mass, and particularly preferably 8.0 to 12.0% by mass. Within the above ranges, the dispersion stability of the droplets is improved.

[0016] The oil component is not particularly limited, and a wide variety of known water-insoluble (phase-separated from water) components can be used. "Water-insoluble" refers to, for example, a solubility of 1.0 g or less in 100 g of water at 25°C. Specific examples include the following: Vegetable oils such as apricot kernel oil, camellia oil, argan oil, soybean oil, olive oil, castor oil, coconut oil, palm oil, palm kernel oil, sesame oil, jojoba oil, cottonseed oil, rapeseed oil, linseed oil, rosehip oil, sunflower oil, essential oils, avocado oil, almond oil, rice bran oil, safflower oil, corn oil, grapeseed oil, coconut oil, Argania spinosa kernel oil, wheat germ oil, rice germ oil, kukui nut oil, crambe abyssinica seed oil, hemp seed oil, peanut oil, camellia oil, evening primrose oil, pistachio oil, macadamia nut oil, meadowfoam oil, cocoa butter, shea butter, and Japan wax; Animal fats such as emu oil, horse oil, beef tallow, lard, mutton tallow, mink oil, egg yolk fat, carp fat, tuna fat, and menhaden fat; Hydrocarbon oils such as light isoparaffin, squalane, liquid paraffin, petrolatum, dodecane, tetradecane, ozokerite, microcrystalline wax, isoparaffin, ceresin, α-olefin oligomer, polybutene, hydrogenated polyisoparaffin, limonene, and turpentine; Lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, fatty acids (preferably having 6 to 40 carbon atoms, more preferably 12 to 30 carbon atoms), such as sostearic acid, behenic acid, oxystearic acid, palmitoleic acid, linoleic acid, linolenic acid, ricinoleic acid, and undecylenic acid; Higher alcohols such as caproyl alcohol, caprylyl alcohol, caprylic alcohol, lauryl alcohol, isostearyl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, arachyl alcohol, behenyl alcohol, oleyl alcohol, hexyldecanol, octyldodecanol, decyltetradecanol, cholesterol, and phytosterols; Esters of straight-chain fatty acids and lower alcohols, such as isopropyl myristate, isopropyl palmitate, and ethyl oleate, Esters of straight-chain fatty acids and straight-chain higher alcohols, such as hexyl laurate, myristyl myristate, decyl oleate, and stearyl stearate, Esters of straight-chain fatty acids and branched alcohols such as octyldodecyl myristate, isostearyl palmitate, and ethylhexyl stearate; Esters of branched fatty acids and lower alcohols, such as ethyl isostearate and isopropyl isostearate; Esters of branched fatty acids and linear higher alcohols, such as cetyl ethylhexanoate and hexyl isostearate, Esters of fatty acids and polyhydric alcohols such as PG dicaprylate, triethylhexanoin, and tri(caprylic / capric acid)glyceryl, Esters of branched fatty acids and branched alcohols, such as 2-octyldodecyl neopentanoate and isostearyl isostearate, Esters of hydroxycarboxylic acids and alcohols such as lauryl lactate, trioctyldodecyl citrate, and diisostearyl malate; Ester oils such as esters of dibasic acids such as diisopropyl adipate and diethyl sebacate; Wax esters such as jojoba oil, jojoba butter, carnauba wax, candelilla wax, rice bran wax, shellac, lanolin, beeswax, montan wax, spermaceti, orange roughy oil, sugarcane wax, palm wax, insect white wax, and wool fat; Other oily ingredients include ethers of polyhydric alcohols and monohydric alcohols such as chimyl alcohol, batyl alcohol, and selachyl alcohol; batyl isostearate, batyl stearate; silicones such as alkyl-modified polysiloxane (dimethylpolysiloxane (dimethicone)), methylphenylpolysiloxane, and fluorine-modified polysiloxane; Oily active ingredients such as UV absorbers (diethylaminohydroxybenzoylhexyl benzoate, ethylhexyl methoxycinnamate, polysilicone-15), DEET, and fragrance.

[0017] The oily component is preferably liquid at 20°C from the viewpoints of emulsion stability and ease of handling during preparation. The oily component preferably contains at least one selected from the group consisting of hydrocarbon oils, fatty acids, higher alcohols, ester oils, wax esters, silicones, vegetable oils and animal oils and oily active ingredients, more preferably contains at least one selected from the group consisting of hydrocarbon oils, fatty acids, ester oils, silicones, vegetable oils and oily active ingredients, even more preferably contains at least one selected from the group consisting of fatty acids, ester oils, vegetable oils and oily active ingredients, even more preferably contains at least one selected from the group consisting of vegetable oils and oily active ingredients, and particularly preferably contains at least one selected from the group consisting of vegetable oils and oily active ingredients. The oil component more preferably contains at least one selected from the group consisting of olive oil, jojoba oil, rosehip oil, sunflower oil, avocado oil, almond oil, grapeseed oil, macadamia nut oil, apricot kernel oil, and soybean oil, and even more preferably contains at least one selected from the group consisting of apricot kernel oil and soybean oil, and even more preferably contains apricot kernel oil. It is also a preferred embodiment that the oily component contains at least one selected from the group consisting of vegetable oils and fats, and an oily active ingredient such as DEET. Since it is possible to incorporate a large amount of the oily ingredient into the aerosol composition, it becomes easier to utilize the active ingredient.

[0018] In an aerosol composition, the average particle size of the emulsion droplets must be 0.5 μm to 7.0 μm. This range improves emulsion stability and spray characteristics. If the average particle size of the droplets is less than 0.5 μm, the total surface area of ​​the droplets will be too large, resulting in reduced emulsion stability. Furthermore, an excessive amount of water-soluble polymer will be required to disperse the droplets. On the other hand, if the average particle size of the droplets exceeds 7.0 μm, emulsion stability will be reduced.

[0019] The average particle size of the emulsion droplets is preferably 0.6 μm to 5.0 μm, more preferably 0.7 μm to 4.0 μm, even more preferably 0.9 μm to 3.0 μm, and even more preferably 1.0 μm to 2.0 μm. When the aerosol composition is an oil-in-water emulsion, the average particle size of the droplets is the average particle size of the oil droplets in the oil phase. The average particle size of the droplets can be controlled by the dispersion strength during emulsion production, the content of the water-soluble polymer, and the like.

[0020] The average particle size of emulsion droplets is measured using a laser diffraction / scattering particle size distribution analyzer (LA-960V2: Horiba, Ltd.) using a flow cell and purified water as the dispersion medium at 20°C.

[0021] The aerosol composition contains a water-soluble polymer. The water-soluble polymer contains at least one selected from the group consisting of polyvinyl alcohol and polyvinylpyrrolidone. As expressed by Stokes' equation, adding a water-soluble polymer to a degree that allows thickening can be achieved, thereby increasing the viscosity of water and suppressing the floating of oil droplets (creaming) in the emulsion. However, thickening the emulsion reduces the spray characteristics when made into an aerosol product, as described above.

[0022] The inventors have conducted research and found that in an emulsion containing an oily component and water but substantially no surfactant, the oily component can be stably dispersed by adding a water-soluble polymer selected from the group consisting of polyvinyl alcohol and polyvinylpyrrolidone to an extent that does not significantly increase the viscosity. The inventors believe the mechanism behind this is as follows. Unlike conventional surfactants, these water-soluble polymers have the property of being able to orient toward the oily component while being water-soluble. Therefore, the particle size of the oily component dispersion can be reduced, and stable dispersion is possible even when the oily component is present in a large amount in the aerosol composition. These water-soluble polymers are not considered to be conventional surfactants.

[0023] Furthermore, with conventional surfactants, when the internal pressure decreases during use, the spray particle size tends to increase and the spray pattern tends to become smaller, but by using the above-mentioned water-soluble polymer, it has been found that the small particle size and wide spray pattern can be maintained well, which makes the sprayed mist softer and less irritating, and also reduces the spray noise of the aerosol product.

[0024] The water-soluble polymer includes at least one selected from the group consisting of polyvinyl alcohol and polyvinylpyrrolidone. Other known water-soluble polymers, such as those listed below, may be used in combination to the extent that the effects of the present disclosure are not impaired. These other water-soluble polymers are not considered to be conventional surfactants. Synthetic polymers such as carboxyvinyl polymers, polyacrylic acid amides, sodium polyacrylates, polyethyleneimines, and highly polymerized polyethylene glycols; Alginic acid, carrageenan, agar, guar gum, dextrin, locust bean gum , natural polymers such as pectin, chitosan, xanthan gum, cyclodextrin; Natural polymer derivatives such as ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, stearoxyhydroxypropyl methylcellulose, carboxymethyl cellulose, and cationized cellulose. When other water-soluble polymers are used in combination, the content of the other water-soluble polymers in the aerosol composition is preferably 0.05% by mass or less, more preferably 0.02% by mass or less, and even more preferably 0.01% by mass or less.

[0025] The water-soluble polymer more preferably includes polyvinyl alcohol. Even more preferably, the water-soluble polymer is polyvinyl alcohol. It has been found that polyvinyl alcohol can exhibit dispersion stability of oily components regardless of molecular weight or degree of saponification.

[0026] The number average molecular weight Mn of the water-soluble polymer is preferably 400 or more, more preferably 500 or more, even more preferably 1000 or more, and still more preferably 2000 or more. On the other hand, the upper limit is preferably 100,000 or less, more preferably 50,000 or less, and even more preferably 30,000 or less.

[0027] When the water-soluble polymer contains polyvinyl alcohol, the degree of saponification of the polyvinyl alcohol, i.e., the ratio of hydroxyl groups to the total of hydroxyl groups and acetoxy groups in the polyvinyl alcohol [hydroxyl groups / (hydroxyl groups+acetoxy groups)×100] (mol %) is preferably 70 to 100 mol %, more preferably 80 to 98 mol %, even more preferably 82 to 97 mol %, and still more preferably 85 to 96 mol %.

[0028] The content of the water-soluble polymer in the aerosol composition is 0.01% by mass to 2.5% by mass. The content of the water-soluble polymer is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.3% by mass or more. On the other hand, the upper limit is preferably 2.0% by mass or less, more preferably 1.5% by mass or less, even more preferably 1.2% by mass or less, still more preferably 1.0% by mass or less, and especially preferably 0.7% by mass or less. By keeping the content within the above range, the oily component can be well dispersed in water with almost no thickening effect, and the aerosol product can exhibit good spray characteristics.

[0029] The content ratio (mass ratio) of the oily component to the water-soluble polymer in the air sole composition (oily component / water-soluble polymer) is preferably 5 / 1 to 120 / 1, more preferably 10 / 1 to 30 / 1, and even more preferably 15 / 1 to 25 / 1. By being in the above range, the dispersibility of the oily component becomes better.

[0030] The aerosol composition contains water. The content of water in the aerosol composition is preferably 50.0 to 97.0% by mass, more preferably 75.0 to 95.0% by mass, even more preferably 80.0 to 92.0% by mass, and still more preferably 85.0 to 91.0% by mass.

[0031] The viscosity of the aerosol composition at 25°C is preferably 0.5 mPa·s to 5.0 mPa·s, more preferably 0.7 mPa·s to 3.5 mPa·s, even more preferably 0.8 mPa·s to 2.8 mPa·s, and even more preferably 1.2 mPa·s to 2.5 mPa·s. The viscosity here is a value measured using a tuning fork vibration viscometer (RV-10000A: A&D Co., Ltd.) at an amplitude of 0.4 mm and at 25°C.

[0032] The aerosol composition must be miscible with water (no phase separation) to the extent that the above effects are not impaired. Additives such as active ingredients, fragrances, antioxidants, and preservatives may be contained. For example, alcohol may be contained. Specific examples include the following. Lower alcohols (e.g., aliphatic monohydric alcohols having 1 to 3 carbon atoms such as ethanol); polyhydric alcohols (e.g., butanediols such as glycerin, propylene glycol (PG), dipropylene glycol (DPG), and 1,3-butanediol); pH adjusters (e.g., citric acid, lactic acid, triethanolamine, KOH, NaOH); rust inhibitors (e.g., ammonia water, ammonium benzoate, sodium nitrite); preservatives (e.g., parabens, phenoxyethanol); urea; minerals such as calcium, iron, and sodium; pigments; dyes; anti-inflammatory agents (e.g., dipotassium glycyrrhizinate); and ultraviolet absorbers (e.g., terephthalidenedicamphorsulfonic acid).

[0033] Next, the aerosol product will be described. The present disclosure provides an aerosol product filled with the above aerosol composition and a propellant. The aerosol container used for the aerosol product can be any of various known pressure-resistant containers. The structure for attaching the valve device can be appropriately selected depending on the type of pressure-resistant container.

[0034] Aerosol products are produced by filling an aerosol composition into an aerosol container, i.e., a pressure-resistant container equipped with an aerosol valve (spray valve). For example, an aerosol product is produced by preparing an aerosol composition and filling the resulting aerosol composition and a propellant into an aerosol container. A so-called double container may be used, in which an inner container is provided inside the pressure-resistant container to separate the propellant from the aerosol composition.

[0035] The mixing ratio of the aerosol composition to the propellant is preferably 90 / 10 to 10 / 90 by mass (aerosol composition / propellant) for liquefied gas, and more preferably about 70 / 30 to 35 / 65. For compressed gas, the aerosol composition is preferably filled so that the pressure inside the container (gauge pressure) at 25°C is 0.3 MPa to 1.0 MPa, and more preferably 0.6 MPa to 0.8 MPa.

[0036] The form of ejection of the aerosol product is not particularly limited, but is preferably a spray or mist. The aerosol composition is preferably a spray composition that is sprayed in the form of a spray or mist. The ejection mechanism of the aerosol product is also not particularly limited, and a known actuator that can spray in the form of a spray or mist can be used. For example, an actuator that generates a swirling flow of the aerosol composition by passing the aerosol composition through a flow path inside the actuator, thereby ejecting the aerosol composition in the form of a spray or mist, can be mentioned.

[0037] The propellant is not particularly limited, and liquefied gas or compressed gas may be used, or a combination of liquefied gas and compressed gas may be used. The aerosol product preferably contains compressed gas. The compressed gas is not particularly limited, and any known gas that can be used in aerosol products can be used. The compressed gas is preferably at least one selected from the group consisting of carbon dioxide gas, nitrogen gas, nitrous oxide gas, argon, helium, and compressed air, and more preferably at least one selected from the group consisting of carbon dioxide gas and nitrogen gas. The liquefied gas is not particularly limited, and any known gas that can be used in aerosol products can be used, including, for example, hydrocarbons such as LPG, LNG, and isopentane, and hydrofluoroolefins such as HFO-1233zd.

[0038] When the aerosol composition is an oil-in-water (O / W) emulsion, the method for producing the emulsion is not particularly limited, and known methods can be used, such as a method in which an aqueous phase and an oil phase are mixed together and then emulsified using a homogenizer or ultrasonic emulsifier. [Example]

[0039] The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples.

[0040] <Examples 1 to 3 and Comparative Examples 1 to 3> The raw materials were placed in a glass beaker according to the formulation (mass %) shown in Table 1 to prepare the aerosol compositions of Examples 1 to 3 and Comparative Examples 1 to 3. The numbers for the preparation methods of the stock solutions of the aerosol compositions listed in Table 1 indicate that the preparations were carried out according to the procedures listed in Table 2. Table 1 shows the evaluation results of the viscosity of the aerosol compositions, the average particle size of the emulsion droplets, and the emulsion stability described below.

[0041] [Table 1]

[0042] [Table 2]

[0043] <Examples 4 and 5> The aerosol compositions of Examples 4 and 5 were obtained using the formulations (mass %) and stock solution preparation methods shown in Tables 2 and 3. The viscosities of the aerosol compositions and the average particle diameters of the emulsion droplets are shown in Table 3. 5.00 parts by mass of the propellant (LPG or HFO-1233zd) shown in Table 3 was filled into a pressure-resistant container equipped with an injection valve device, with 100.00 parts by mass of each aerosol composition obtained, and nitrogen gas was further filled to adjust the internal pressure of the product to 0.75 MPa or 0.30 MPa. A button for compressed gas (inner diameter φ0.3 mm) was attached, and aerosol products of Examples 4 and 5 were obtained. The aerosol compositions and aerosol products obtained were used to carry out the evaluations described below. The results are shown in Table 3. Shown in Table 3.

[0044] [Table 3] *After filling with liquefied gas, the internal pressure of the sample was adjusted to 0.75 MPa or 0.30 MPa with nitrogen.

[0045] <Examples 6 to 27 and Comparative Examples 4 to 18> Aerosol compositions of Examples 6 to 27 and aerosol compositions of Comparative Examples 4 to 18 were prepared using the formulations (mass %) and stock solution preparation methods shown in Tables 2 and 4 to 8.

[0046] [Table 4]

[0047] [Table 5]

[0048] [Table 6]

[0049] [Table 7]

[0050] [Table 8]

[0051] The raw materials used in the table are as follows: (Oily ingredients) NIKKOL Apricot Kernel Oil: Apricot Kernel Oil (Nikko Chemicals Co., Ltd.) Soybean oil: Soybean oil (Fujifilm Wako Pure Chemical Industries, Ltd.) NIKKOL Olive Oil: Olive fruit oil (Nikko Chemicals Co., Ltd.) NIKKOL Jojoba Oil S: Jojoba seed oil (Nikko Chemicals Co., Ltd.) NIKKOL Grapeseed Oil: Grape seed oil (Nikko Chemicals Co., Ltd.) NIKKOL Sweet Almond Oil: Almond oil (Nikko Chemicals Co., Ltd.) NIKKOL Macadamia Nut Oil: Macadamia Seed Oil (Nikko Chemicals Co., Ltd.) NIKKOL Sunflower Oil: Sunflower seed oil (Nikko Chemicals Co., Ltd.) NIKKOL Refined Avocado Oil: Avocado Oil (Nikko Chemicals Co., Ltd.) NIKKOL Rosehip Oil: Rosa canina fruit oil (Nikko Chemicals Co., Ltd.) NIKKOL Sugar Squalane: Squalane (Nikko Chemicals Co., Ltd.) Exepar IPM: Isopropyl myristate (Kao Corporation) DEET: DEET (Nippon Fine Chemical Co., Ltd.) NIKKOL CIO: Cetyl ethylhexanoate (Nikko Chemicals Co., Ltd.) KF-96-100cs: Dimethicone (Shin-Etsu Chemical Co., Ltd.)

[0052] (Water-soluble polymer) EG-05C: Polyvinyl alcohol (Mn approx. 10200, saponification degree 86.5 to 89.0 mol%, Mitsubishi Chemical Corporation) JT-05: Polyvinyl alcohol (Mn approx. 23800, saponification degree 93.5-95.0 mol%, Japan Vinyl Acetate & Poval Co., Ltd.) PVP: Polyvinylpyrrolidone (Mn29000, Fujifilm Wako Pure Chemical Industries, Ltd.) Sangelose 60L: Hydroxypropyl methylcellulose stearoxy ether (large Dokasei Kogyo Co., Ltd.) Metrolose 60SH-06: Hydroxypropyl methylcellulose (Shin-Etsu Chemical Co., Ltd.) SE600: Hydroxyethyl cellulose (Daicel Corporation) Lipidure-PMB: Polyquaternium-51, water (NOF Corporation) Lipidure-NA: Polyquaternium-61, glycerin, BG, PCA ethyl cocoyl arginate, water (NOF Corporation) Carbopol 980: Carboxyvinyl polymer (Lubrizol)

[0053] (surfactant) Emal 10PT: Sodium lauryl sulfate (Kao Corporation) KOTAMIN 86W: stearyl trimethylammonium chloride, water (Kao Corporation) NIKKOL TO-10V: polysorbate 80 (Nikko Chemicals Co., Ltd.) (additives) Triethanolamine: Triethanolamine (Ando Parachemie Co., Ltd.) 1,3-Butylene glycol-P: 1,3 Butylene glycol (KH Neochem Co., Ltd.)

[0054] The obtained aerosol compositions of Examples 6 to 27 and Comparative Examples 4 to 18 and a propellant (nitrogen gas) were filled into pressure-resistant containers equipped with a spray valve device, and the internal pressure of the product was adjusted to 0.75 MPa or 0.30 MPa. A button for compressed gas (inner diameter φ0.3 mm) was attached, and the aerosol products of Examples 6 to 27 and Comparative Examples 4 to 18 were obtained. The obtained aerosol compositions and aerosol products were evaluated as follows. The results are shown in Tables 4 to 8. The viscosities of the aerosol compositions are also shown in Tables 4 to 8.

[0055] (1) Average particle size of oil droplets The average particle size of the oil droplets in each aerosol composition was measured by the method described above, and evaluated according to the following criteria. (Evaluation criteria) A: Average particle size is 1.0 μm or more and less than 2.0 μm B+: Average particle size is 0.7 μm or more and less than 1.0 μm, or 2.0 μm or more and less than 4.0 μm B: Average particle size is 0.5 μm or more and less than 0.7 μm, or 4.0 μm or more and 7.0 μm or less C+: Average particle size is 0.2 μm or more and less than 0.5 μm, or average particle size is more than 7.0 μm and less than 10.0 μm C: Average particle size is less than 0.2 μm or 10.0 μm or more

[0056] (2) Emulsion stability The aerosol composition was collected in a 50 ml vial and stored in a thermostatic chamber at 40° C. for 40 days as an accelerated test, and the state of the aerosol composition after storage was evaluated according to the following criteria. (Evaluation criteria) A: No demulsification B: Separates but re-emulsifies upon shaking C: Separates and does not re-emulsify even after shaking

[0057] (3) Spray particle diameter The internal pressure of each aerosol product was adjusted to 0.75 MPa, and the spray particle size (cumulative 50% particle size by volume (DV(50))) was measured using a laser diffraction particle size distribution analyzer (Spraytec, Malvarn). The spray distance was 15 cm and the spray time was 3 seconds. (Evaluation criteria) A: DV(50) value is 50.0 μm or more and less than 70.0 μm B+: DV(50) value is 70.0μm or more and less than 75.0μm B: DV(50) value is 75.0 μm or more and less than 80.0 μm C+: DV(50) value is 80.0μm or more and less than 100.0μm C: DV(50) value is less than 50.0 μm or 100.0 μm or more

[0058] In addition, a similar evaluation was performed using each aerosol product with the internal pressure adjusted to 0.30 MPa. (Evaluation criteria) A: DV(50) value is 50.0 μm or more and less than 85.0 μm B+: DV(50) value is 85.0μm or more and less than 90.0μm B: DV(50) value is 90.0 μm or more and less than 95.0 μm C+: DV(50) value is 95.0μm or more and less than 100.0μm C: DV(50) value is less than 50.0 μm or 100.0 μm or more

[0059] (4) Spray pattern Each aerosol product was sprayed onto a glass surface for 1 second from a distance of 15 cm using an internal pressure of 0.75 MPa or 0.30 MPa, and the diameter of the spray pattern was measured and evaluated according to the following criteria. The spray was placed horizontally to the glass surface and the spray was perpendicular to the glass surface. The average value of 3 tests was used. (Evaluation criteria) A: 250mm or more and less than 300mm B+: 200mm or more and less than 250mm B: 150mm or more and less than 200mm C+: 100mm or more and less than 150mm C: Less than 100mm or 300mm or more

[0060] (5) Injection sound Using a standard sound level meter (NL-42A: Rion Co., Ltd.), the contents of each aerosol product were sprayed for 5 seconds at an internal pressure of 0.75 MPa, and the equivalent sound level measured by a sound detector placed 4 cm away from the aerosol product was evaluated. The average value of three tests was used. (Evaluation criteria) A: Less than 60.0 dB B+: 60.0dB or more and less than 65.0dB B: 65.0dB or more and less than 70.0dB C+: 70.0dB or more and less than 75.0dB C:75.0dB or more

[0061] Example 28 An aerosol spray of the emulsion was prepared according to the following procedure: The aerosol composition of Example 28 was obtained using the formulation (mass %) and concentrate preparation method shown in Tables 2 and 9. The resulting aerosol composition and propellant (nitrogen gas) were filled into a pressure-resistant container equipped with an injection valve device, and the internal pressure of the product was adjusted to 0.75 MPa or 0.30 MPa. A button for compressed gas (inner diameter φ0.3 mm) was attached, and the aerosol product of Example 28 was obtained. The resulting aerosol composition and aerosol product were subjected to the above-mentioned evaluations. The results are shown in Table 9.

[0062] [Table 9]

[0063] Example 29 An aerosol spray of a sunscreen agent was prepared according to the following procedure: The aerosol composition of Example 29 was obtained using the formulation (mass %) and concentrate preparation method shown in Tables 2 and 10. The resulting aerosol composition and propellant (nitrogen gas) were filled into a pressure-resistant container equipped with an injection valve device, and the internal pressure of the product was adjusted to 0.75 MPa or 0.30 MPa. A button for compressed gas (inner diameter φ0.3 mm) was attached, and the aerosol product of Example 29 was obtained. The resulting aerosol composition and aerosol product were subjected to the above-mentioned evaluations. The results are shown in Table 10.

[0064] [Table 10]

[0065] In addition to those mentioned above, the manufacturers of the materials used are as follows: TDSA aqueous solution (Shinsung Materials) Uvinul A plus B (BASF Japan Ltd.) Parsol SLX (DSM Co., Ltd.)

Claims

1. An aerosol composition containing water, an oily component, and a water-soluble polymer, the water-soluble polymer comprises at least one selected from the group consisting of polyvinyl alcohol and polyvinylpyrrolidone; the content of the water-soluble polymer in the aerosol composition is 0.01% by mass to 2.5% by mass; The aerosol composition forms an emulsion, The emulsion droplets have an average particle size of 0.5 μm to 7.0 μm; The aerosol composition is characterized in that it is substantially free of surfactants.

2. 2. The aerosol composition according to claim 1, wherein the emulsion is an oil-in-water emulsion in which an oil phase containing the oily component is dispersed in an aqueous phase containing water.

3. The oil component is liquid at 20°C, 3. The aerosol composition according to claim 1, wherein the oily component comprises at least one selected from the group consisting of hydrocarbon oils, fatty acids, higher alcohols, ester oils, wax esters, silicones, vegetable oils and fats, animal oils and fats, and oily active ingredients.

4. The oil component is liquid at 20°C, 3. The aerosol composition according to claim 1, wherein the oily component comprises at least one selected from the group consisting of hydrocarbon oils, fatty acids, ester oils, silicones, vegetable oils, and oily active ingredients.

5. 5. The aerosol composition according to claim 1, wherein the content of the oily component in the aerosol composition is more than 1.0% by mass and not more than 35.0% by mass.

6. 6. The aerosol composition according to claim 1, wherein the viscosity of the aerosol composition at 25° C. is 0.5 mPa·s to 5.0 mPa·s.

7. 7. The aerosol composition according to claim 1, wherein the content of the water-soluble polymer in the aerosol composition is 0.05% by mass to 1.2% by mass.

8. The aerosol composition according to any one of claims 1 to 7, which is a spray composition.

9. 1. An aerosol product filled with an aerosol composition and a propellant, An aerosol product, wherein the aerosol composition is the aerosol composition according to any one of claims 1 to 8.

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