Aerosol compositions, aerosol products, and metered-dose aerosol products

Abstract

To provide an aerosol composition, an aerosol product and a metered-spray aerosol product that ensure excellent powder dispersibility.SOLUTION: An aerosol composition comprises stock solution and liquefied gas. The stock solution comprises at least one of inorganic powder or organic powder, clay mineral powder, and oil solution. The liquefied gas comprises dimethyl ether. The content of dimethyl ether is 1-30 mass%.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an aerosol composition, an aerosol product, and a metered-dose aerosol product. More specifically, the present invention relates to an aerosol composition, an aerosol product, and a metered-dose aerosol product having good powder dispersibility.

Background Art

[0002] Conventionally, there has been known an aerosol product that contains a plurality of powders and is sprayed after dispersing the powders in an aerosol composition by shaking the container before use. However, when the sedimentation rate of the powder is high, the aerosol composition is likely to have uneven powder adhesion even when the container is shaken before use to disperse the powder in the aerosol composition. Also, when the sedimentation rate of the powder is low and the powder is likely to aggregate, the aerosol composition may have the powder aggregated during storage and, even when the container is shaken before use, may become in a large lump state and the powder may not be sprayed uniformly, or the valve may be easily clogged. Such problems are particularly prominent when using a metering valve equipped with a metering injection mechanism. In a metered-dose aerosol product equipped with a metering valve, the powder in the metering chamber is difficult to be stirred even when the container is shaken, and it is difficult to redisperse the once-aggregated powder.

[0003] Therefore, Patent Document 1 discloses a non-aqueous powder aerosol product filled in an aerosol container equipped with a metering injection mechanism, the composition containing inorganic powder and / or organic powder, a hydrophobized clay mineral powder, a liquefied gas propellant, and an aliphatic alcohol having 6 to 26 carbon atoms.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the invention described in Patent Document 1 is formulated to have a low powder content and a high proportion of liquefied gas. Such aerosol products tend to scatter powder from the sprayed aerosol composition. Furthermore, it is difficult to incorporate the desired amount of powder.

[0006] This invention has been made in view of the above-mentioned conventional problems, and aims to provide an aerosol composition, an aerosol product, and a metered-dose aerosol product with good powder dispersibility. [Means for solving the problem]

[0007] The present invention, which solves the above problems, mainly includes the following configuration.

[0008] (1) An aerosol composition comprising a stock solution and a liquefied gas, wherein the stock solution comprises at least one of inorganic powder or organic powder, clay mineral powder, and an oil, and the liquefied gas comprises dimethyl ether, with the dimethyl ether content being 1 to 30% by mass.

[0009] With this configuration, the aerosol composition contains a stock solution comprising at least one of inorganic or organic powders, clay mineral powder, and an oil, to which a specific amount of dimethyl ether is added. This improves the dispersibility of the powder due to the dimethyl ether, resulting in excellent powder dispersibility.

[0010] (2) The aerosol composition according to (1), wherein the content of the clay mineral powder is 2 to 20% by mass in the aerosol composition.

[0011] With this configuration, the aerosol composition is likely to exhibit the effect of improving the dispersibility of powders with dimethyl ether.

[0012] (3) The aerosol composition according to (1) or (2), wherein the inorganic powder or organic powder contains silylated silica.

[0013] With this configuration, the aerosol composition exhibits even better powder dispersibility.

[0014] (4) The aerosol composition according to any one of (1) to (3), wherein the content of the inorganic powder or organic powder is 3 to 40% by mass in the aerosol composition.

[0015] With this configuration, the aerosol composition exhibits excellent dispersibility even when containing high concentrations of inorganic or organic powders, making it easier to obtain the effects of the inorganic or organic powders.

[0016] (5) An aerosol product in which an aerosol composition described in any of (1) to (4) is filled into an aerosol container.

[0017] With this configuration, the aerosol product contains an aerosol composition with excellent powder dispersibility. Therefore, the powder is less likely to aggregate and settle within the aerosol container, and even if the powder is present at a high concentration, it can be sprayed uniformly. As a result, the aerosol product is more likely to deliver the desired powder effect.

[0018] (6) A metered-dose aerosol product in which the aerosol composition described in any of (1) to (4) is filled into an aerosol container equipped with a metered-dose spraying mechanism.

[0019] With this configuration, the metered-dose aerosol product contains an aerosol composition with excellent powder dispersibility. Therefore, the powder is less likely to aggregate and settle in the metered-dose chamber of the metered-dose aerosol product, and the powder can be sprayed uniformly even when it contains a high concentration of powder. As a result, the effects of the powder are easily obtained in the metered-dose aerosol product. [Effects of the Invention]

[0020] According to the present invention, it is possible to provide an aerosol composition, an aerosol product, and a metered-dose spray type aerosol product with good powder dispersibility. [Modes for carrying out the invention]

[0021] <Foaming aerosol composition> The aerosol composition of one embodiment of the present invention includes a stock solution and a liquefied gas. The stock solution includes at least one of an inorganic powder or an organic powder, a clay mineral powder, and an oil agent. The liquefied gas includes dimethyl ether. The content of dimethyl ether is 1 to 30% by mass. Each will be described below.

[0022] (Stock solution) The stock solution includes at least one of an inorganic powder or an organic powder, a clay mineral powder, and an oil agent.

[0023] ·At least one of an inorganic powder or an organic powder At least one of an inorganic powder or an organic powder (hereinafter, these are also collectively referred to as inorganic powder, etc.) is blended to obtain an antiperspirant effect or astringent effect by adhering to the skin, or to absorb sebum and make the skin smooth. In addition, inorganic powder, etc. is used to improve dispersibility.

[0024] The inorganic powder, etc. is not particularly limited. For example, the inorganic powder, etc. includes antiperspirants such as aluminum chlorohydrate, allantoin chlorohydroxyaluminum, aluminum chloride, zinc oxide, sebum absorbers such as octenyl succinic acid corn starch Al, talc, titanium oxide, silica, zeolite, kaolin, mica, magnesium carbonate, calcium carbonate, magnesium carbonate, zinc silicate, magnesium silicate, aluminum silicate, calcium silicate, nylon, etc. Among these, it is preferable that the inorganic powder, etc. contains an antiperspirant such as aluminum chlorohydrate or a sebum absorber such as octenyl succinic acid corn starch Al.

[0025] The content of inorganic powders, etc., is not particularly limited. For example, the inorganic powders, etc., are preferably at least 3% by mass, and more preferably at least 5% by mass, in the aerosol composition. Furthermore, the inorganic powders, etc., are preferably at least 40% by mass, and more preferably at least 35% by mass, in the aerosol composition. When the inorganic powder content is within the above range, the aerosol composition is more likely to exhibit the effect of improving the dispersibility of the powder by dimethyl ether, and also to exhibit antiperspirant and astringent effects from the inorganic powders, etc.

[0026] • Silylated silica with a hydrophobic surface treatment The aerosol composition of this embodiment preferably further contains silylated silica whose surface has been hydrophobized. This makes it easier to adjust the viscosity of the stock solution, and the aerosol composition exhibits even better dispersibility even when it contains high concentrations of inorganic powders, etc.

[0027] The treatment agents used in hydrophobic treatment are not particularly limited. For example, treatment agents include organosilyl compounds and silicone compounds. Organosilyl compounds include methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, hexamethyldisilazane, methyltrialkoxysilane, dimethyldialkoxysilane, trimethylalkoxysilane, ethyltrichlorosilane, propyltrichlorosilane, hexyltrichlorosilane, long-chain alkyltrichlorosilane, ethyltrialkoxysilane, propyltrialkoxysilane, hexyltrialkoxysilane, long-chain alkyltrialkoxysilane, methacrylicsilane, fluoroalkylsilane, and perfluoroalkylsilane. Silicone compounds include dimethylpolysiloxane (silicone oil), methylphenylpolysiloxane, methylhydrogenpolysiloxane, and amino-modified silicones.

[0028] When silylated silica is incorporated, the amount of silylated silica is not particularly limited. For example, the amount of silylated silica in the aerosol composition is preferably 0.5% by mass or more, and more preferably 1% by mass or more. Furthermore, the amount of silylated silica in the aerosol composition is preferably 10% by mass or less, and more preferably 8% by mass or less. When the amount of silylated silica is within the above range, the aerosol composition is more likely to have improved powder dispersibility.

[0029] In particular, the aerosol composition of this embodiment preferably contains silylated silica, as this improves the dispersibility of antiperspirants such as aluminum chlorohydrate.

[0030] • Clay mineral powder Clay mineral powder is used not only to adjust the viscosity of the stock solution, but also to facilitate the improvement of powder dispersibility by dimethyl ether.

[0031] The clay mineral powder is not particularly limited. For example, clay mineral powders include montmorillonite, saponite, hectorite, smectite, sericite, and bentonite. Among these, hectorite, smectite, and bentonite are preferred.

[0032] The content of clay mineral powder is not particularly limited. For example, the content of clay mineral powder in the aerosol composition is preferably 2% by mass or more, and more preferably 5% by mass or more. Furthermore, the content of clay mineral powder in the aerosol composition is preferably 20% by mass or less, and more preferably 15% by mass or less. When the content of clay mineral powder is within the above range, the aerosol composition is more likely to have the effect of improving the dispersibility of the powder with dimethyl ether, and the dispersibility of the powder is more likely to be improved.

[0033] • Oils The oil is added as a solvent to disperse the powder in the aerosol composition.

[0034] The oils are not particularly limited. For example, oils include ester oils such as isopropyl myristate, isopropyl palmitate, ethylhexyl palmitate, PPG-3 benzyl ether myristate, isotridecyl isononanoate, diisopropyl adipate, diethoxyethyl succinate, diethylhexyl succinate, tri(caprylic / capric acid)glycerin, methylpentanediol dieopentanoate, and neopentyl glycol dicaprate. These include silicone oils such as rupolysiloxane (dimethicone), methylphenylpolysiloxane, and methylpolycyclosiloxane; hydrocarbon oils such as liquid paraffin, kerosene, squalene, squalane, and isoparaffin; and oils and fats such as avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, sesame oil, castor oil, linseed oil, safflower oil, jojoba oil, malt oil, coconut oil, and palm oil.

[0035] The oil content is not particularly limited. For example, the oil content is preferably 40% by mass or more, and more preferably 45% by mass or more, in the aerosol composition. Furthermore, the oil content is preferably 80% by mass or less, and more preferably 75% by mass or less, in the aerosol composition. When the oil content is within the above range, the aerosol composition is more likely to have the effect of improving the dispersibility of powders with dimethyl ether, and the powders are easier to disperse.

[0036] ·Optional ingredients In addition to the inorganic powder, organic powder, clay mineral powder, and oil described above, the stock solution of this embodiment may also contain optional components such as active ingredients, alcohol, and solid oils as appropriate.

[0037] The active ingredients can be appropriately selected depending on the product's use and purpose. For example, the active ingredients include amaranth (Red No. 2), erythrosine (Red No. 3), new coccine (Red No. 102), rose bengal (Red No. 105), acid red (Red No. 106), rose benkal K (Red No. 232), violamin R (Red No. 401), resorcinol brown (Brown No. 201), orange I (Orange No. 402), orange II (Orange No. 205), tartrazine (Yellow No. 4), sunset yellow (Yellow No. 5), uranine (Yellow No. 202), and quinoline yellow WS (Yellow No. 202). Dyes such as No. 3, Naphthol Yellow S (Yellow No. 403), Fast Green (Green No. 3), Alizarin Cyanine Green F (Green No. 201), Pyranine Concentrate (Green No. 204), Naphthol Green B (Green No. 401), Brilliant Blue FCF (Blue No. 1), Indigo Carmine (Blue No. 2), Patent Blue (Blue No. 203), Alizrol Purple (Purple No. 401), Naphthol Blue Black (Black No. 401), Diethylamino Hydroxybenzoyl Hexyl Benzoate, 2-Exyl Paramethoxycinnamate UV absorbers such as ethylhexyl triazone, oxybenzene, hydroxybenzophenone sulfonic acid, sodium dihydroxybenzophenone sulfonate, and dihydroxybenzophenone; vitamins such as retinol, retinyl acetate, retinyl palmitate, calcium pantothenate, ascorbic acid, sodium ascorbate, dl-α-tocopherol, tocopherol acetate, tocopherol, tocopherol nicotinate, dibenzoylthiamine, riboflavin, and mixtures thereof. These include various extracts such as Swertia japonica extract and rosemary extract, cooling agents such as mint and menthol, disinfectants such as cetylpyridinium chloride and isopropylmethylphenol, moisturizers such as sorbitol and hyaluronic acid, fragrances such as floral, green, citrus green, green floral, citrus, rose, rosewood, herbal wood, lemon, and peppermint, pH adjusters such as citric acid and lactic acid, chelating agents such as disodium edetate, and preservatives such as parabens and phenoxyethanol.

[0038] When an active ingredient is included, the amount of the active ingredient is not particularly limited. The amount of the active ingredient is preferably 0.01% by mass or more, and more preferably 0.03% by mass or more, in the aerosol composition. Furthermore, the amount of the active ingredient is preferably 15% by mass or less, and more preferably 10% by mass or less, in the aerosol composition. By keeping the amount of the active ingredient within the above range, the effects of the active ingredient are more easily obtained.

[0039] Alcohol is added to adjust drying properties and improve the user experience.

[0040] Alcohols are not particularly limited. For example, alcohols include monohydric alcohols with 2 to 3 carbon atoms, such as ethanol and isopropanol, and polyhydric alcohols, such as glycerin, propylene glycol, 1,3-butylene glycol, hexylene glycol, dipropylene glycol, and diglycerin.

[0041] When alcohol is included, the alcohol content is not particularly limited. For example, the alcohol content is preferably 0.5% by mass or more, and more preferably 1% by mass or more, in the aerosol composition. Furthermore, the alcohol content is preferably 10% by mass or less, and more preferably 8% by mass or less, in the aerosol composition. By keeping the alcohol content within the above range, the drying properties can be easily adjusted.

[0042] Solid oils are used to adjust the viscosity of the stock solution and to aid in the dispersibility of powders, among other purposes.

[0043] Solid oils are not particularly limited. For example, solid oils include higher alcohols such as myristyl alcohol, cetyl alcohol, stearyl alcohol, and behenyl alcohol; higher fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid; hydrocarbons such as paraffin wax and microcrystalline wax; and waxes such as beeswax, lanolin, and candelilla wax.

[0044] When solid oils are incorporated, the amount of solid oils is not particularly limited. For example, the amount of solid oils in the aerosol composition is preferably 0.01% by mass or more, and more preferably 0.05% by mass or more. Furthermore, the amount of solid oils in the aerosol composition is preferably 5% by mass or less, and more preferably 3% by mass or less. By keeping the amount of solid oils within the above range, the effects of incorporating solid oils are easily obtained, and the user experience is less likely to deteriorate due to stickiness, etc.

[0045] Returning to the overall description of the stock solution, the content of the stock solution is not particularly limited. For example, the content of the stock solution is preferably 70% by mass or more, and more preferably 75% by mass or more, in the aerosol composition. Furthermore, the content of the stock solution is preferably 99% by mass or less, and more preferably 98% by mass or less, in the aerosol composition. When the content of the stock solution is within the above range, the aerosol composition is likely to exhibit the effect of improving the dispersibility of powders by dimethyl ether.

[0046] The method for preparing the stock solution is not particularly limited. The stock solution can be prepared by conventionally known methods. For example, the stock solution can be prepared by adding the above-mentioned inorganic powder, clay mineral powder, and other optional components to an oil and mixing them to disperse the powder.

[0047] (Liquefied gas) The liquefied gas contains dimethyl ether. Dimethyl ether is used as a dispersant to disperse powders in aerosol compositions.

[0048] The dimethyl ether content in the aerosol composition is preferably 1% by mass or more, and more preferably 2% by mass or more. Furthermore, the dimethyl ether content is preferably 30% by mass or less, and more preferably 25% by mass or less. When the dimethyl ether content is within the above range, the aerosol composition is more likely to have the effect of improving the dispersibility of powders, and the powders are easier to disperse.

[0049] The liquefied gas may include liquefied gases other than dimethyl ether for purposes such as adjusting the pressure of the aerosol composition. Examples of liquefied gases other than dimethyl ether include liquefied petroleum gas, hydrofluoroolefins with a boiling point of less than 5°C such as trans-1,3,3,3-tetrafluoropropa-1-ene (HFO-1234ze, boiling point -19°C) and trans-2,3,3,3-tetrafluoropropa-1-ene (HFO-1234yf, boiling point -29°C).

[0050] When a liquefied gas other than dimethyl ether is included, the content of the liquefied gas other than dimethyl ether is preferably 0.5% by mass or more, and more preferably 1% by mass or more, in the aerosol composition. Furthermore, the content of the liquefied gas other than dimethyl ether is preferably 20% by mass or less, and more preferably 10% by mass or less, in the aerosol composition. By keeping the content of the liquefied gas other than dimethyl ether within the above range, the effect of improving the dispersibility of powder by dimethyl ether is less likely to be inhibited in the aerosol composition, resulting in excellent powder dispersibility and easy spraying to the very end.

[0051] The aerosol composition may be pressurized with a compressed gas. The compressed gas is not particularly limited. For example, the compressed gas may be nitrogen, air, oxygen, hydrogen, carbon dioxide, nitrous oxide, etc.

[0052] When compressed gas is used, it is preferable that the compressed gas be filled so that the pressure inside the aerosol container at 25°C is 0.4 MPa or higher, and more preferably 0.45 MPa or higher. Furthermore, it is preferable that the compressed gas be filled so that the pressure inside the aerosol container at 25°C is 0.85 MPa or lower, and more preferably 0.80 MPa or lower. By filling the compressed gas to a pressure within the above range, the aerosol composition is easily dispensed stably even at low temperatures.

[0053] <Aerosol Products> An aerosol product according to one embodiment of the present invention is an aerosol product obtained by filling an aerosol container with the above-described aerosol composition. The aerosol product of this embodiment can be prepared by filling with the aerosol composition. Specifically, the aerosol composition can be prepared by filling the container body with the stock solution, fixing the valve, filling with liquefied gas through the valve, mixing the stock solution and liquefied gas, and dispersing the powder, and an aerosol product filled with the aerosol composition can be prepared.

[0054] The container body is a cylindrical container with a closed bottom, into which the aerosol composition is filled. A valve is attached to the opening of the container body.

[0055] The material of the container body is not particularly limited. For example, the material of the container body may be metal such as aluminum or tinplate, various synthetic resins, pressure-resistant glass, etc.

[0056] A valve is a component that closes and seals the opening of the container body and sprays the aerosol composition. The valve is not particularly limited. The valve mainly comprises a housing, a stem fitted into the housing from the upper end and having a stem hole formed therein that communicates the inside and outside of the container body, a stem rubber for closing the stem hole, a tube member provided at the lower end of the housing for drawing up the aerosol composition from inside the container body, and a biasing member for biasing the stem upward. A spraying member for spraying the aerosol composition is attached to the upper end of the stem.

[0057] The spraying member is a component for spraying an aerosol composition by operating the opening and closing of a valve, and is attached to the upper end of the stem. The spraying member mainly comprises a nozzle portion with a spray hole formed therein and an operating portion operated by the user with their finger or the like. The aerosol composition is sprayed from the spray hole. The number and shape of the spray holes are not particularly limited. There may be multiple spray holes. The shape of the spray holes may be approximately circular, approximately angular, etc.

[0058] In this embodiment of the aerosol product, when the spraying member is pressed down, the valve stem is also pressed down. This causes the stem rubber to bend downward, opening the stem hole. As a result, the inside and outside of the container body are connected, and the pressure of the aerosol composition causes the aerosol composition inside the container body to pass through the stem hole and the internal stem passage, be sent to the spraying member, and then sprayed from the spray hole.

[0059] The aerosol product of this embodiment contains the above-mentioned aerosol composition, which has excellent powder dispersibility. Therefore, the powder is less likely to aggregate and settle in the aerosol container, and even if it contains a high concentration of powder, the powder can be sprayed uniformly. As a result, the aerosol product easily delivers the effects of the powder.

[0060] <Quantitative-dispense aerosol products> A quantitative-spray aerosol product according to one embodiment of the present invention is an aerosol product obtained by filling the above-described aerosol composition into an aerosol container equipped with a quantitative spray mechanism. The quantitative-spray aerosol product of this embodiment can be prepared by filling it with an aerosol composition. Specifically, the aerosol composition can be prepared by filling the container body with the stock solution, attaching a quantitative spray valve equipped with a quantitative spray mechanism, filling with liquefied gas from the quantitative spray valve, mixing the stock solution and liquefied gas, and dispersing the powder, and a quantitative-spray aerosol product filled with the aerosol composition can be prepared.

[0061] The container body is the same as that described above in relation to the embodiment of the aerosol product.

[0062] A metering valve is a component for sealing the opening of a container body and spraying a fixed amount of aerosol composition. The metering valve is not particularly limited. A metering valve mainly comprises a housing, a stem fitted into the housing from the upper end and having a stem hole that communicates the inside and outside of the container body, a stem rubber for closing the stem hole, a tube member provided at the lower end of the housing for drawing up the aerosol composition from inside the container body, a metering chamber provided inside the housing, and a biasing member for biasing the stem upward. A spraying member for spraying the aerosol composition is attached to the upper end of the stem.

[0063] The spraying member is the same as that described above in relation to embodiments of aerosol products.

[0064] In this embodiment of the metered-discharge aerosol product, when the spray member is pressed down, the valve stem is also pressed down. This causes the stem rubber to bend downward, opening the stem hole. The lower end of the stem also closes the communication portion connecting the tube member to the metered-discharge chamber. As a result, the inside of the container body and the metered-discharge chamber are isolated, while the metered-discharge chamber and the outside are connected. When the metered-discharge chamber and the outside are connected, the pressure of the aerosol composition stored in the metered-discharge chamber causes a fixed amount of the aerosol composition to pass through the stem hole and the internal stem passage, be sent to the spray member, and then sprayed from the spray hole.

[0065] The metered-dose aerosol product of this embodiment contains the above-mentioned aerosol composition, which has excellent powder dispersibility. Therefore, the powder is less likely to aggregate and settle in the metered-dose chamber of the aerosol product, and even if it contains a high concentration of powder, the powder can be sprayed uniformly. As a result, the aerosol product easily delivers the effects of the powder. [Examples]

[0066] The present invention will be described more specifically below with reference to examples. The present invention is not limited in any way to these examples.

[0067] (Example 1) Stock solution A was prepared according to the formulation shown in Table 1 below, and 51.0 g (85% by mass) was filled into a transparent polyethylene terephthalate container. A metered-dose spray valve was fixed to the opening of the container, and 9.0 g (15% by mass) of dimethyl ether was filled through the valve to produce an aerosol product filled with the aerosol composition. The metered-dose spray valve used had a single-shot spray volume of 0.2 mL, and the spray member had a nozzle diameter of φ0.5 mm.

[0068] [Table 1]

[0069] (Example 2, Comparative Examples 1-2) The formulation of the stock solution was changed to the formulation shown in Table 1, and stock solutions B, D, and E were prepared. Using the obtained stock solutions B, D, and E, the aerosol compositions of Example 2 and Comparative Examples 1 and 2 were prepared in the same manner as in Example 1.

[0070] (Example 3) Stock solution C was prepared according to the formulation shown in Table 1 above, and 57.0 g (95% by mass) was filled into a transparent polyethylene terephthalate container. A continuous spray valve without a metering chamber was fixed to the opening of the container body, and 3.0 g (5% by mass) of dimethyl ether was filled through the valve. Nitrogen was then filled through the valve to adjust the pressure to 0.75 MPa, and an aerosol product containing the aerosol composition was manufactured. A spray member with a nozzle diameter of φ0.5 was used.

[0071] The aerosol compositions obtained in Examples 1-3 and Comparative Examples 1-2 were evaluated for their settling and redispersibility using the following evaluation methods. The results are shown in Table 2.

[0072] <Settling> The liquid level of the aerosol composition inside the container was adjusted to 80 mm, a mark was made at 40 mm, the container was shaken up and down to disperse the powder in the aerosol composition, and then the container was left to stand overnight. The height of the powder was then evaluated according to the following evaluation criteria. (Evaluation Criteria) ◎: The height of the powder was 75-80 mm. ○: The height of the powder was 61-74 mm. △: The height of the powder was 41-60 mm. ×: The height of the powder was 40 mm or less.

[0073] <Redispersibility> The container was shaken up and down to disperse the powder in the aerosol composition, and then the container was left to stand overnight. The redispersibility of the powder was then evaluated according to the following evaluation criteria. (Evaluation Criteria) ○: Shaking 1 to 3 times resulted in a uniform dispersion of the powder. △: After shaking 4 to 9 times, the powder dispersed uniformly. ×: Even after shaking 10 times, the powder did not disperse evenly, and some of it remained clumped at the bottom.

[0074] [Table 2]

[0075] As shown in Table 2, the aerosol compositions of Examples 1 and 2 showed almost no powder sedimentation and dispersed uniformly within 3 washes. The aerosol composition of Example 3 also showed almost no powder sedimentation and dispersed uniformly within 9 washes. The aerosol composition of Comparative Example 1, in which liquefied petroleum gas was used as the liquefied gas, and the aerosol composition of Comparative Example 2, in which 45% by mass of dimethyl ether as the liquefied gas, showed powder sedimentation to less than half its original volume and poor redispersibility.

Claims

1. It contains the undiluted solution and liquefied gas. The aforementioned stock solution comprises at least one of inorganic powder or organic powder, clay mineral powder, and an oily agent. The liquefied gas contains dimethyl ether, The dimethyl ether content is 1 to 30% by mass. The aerosol composition wherein the content of the oil is 40 to 80% by mass in the aerosol composition.

2. The aerosol composition according to claim 1, wherein the content of the clay mineral powder is 2 to 20% by mass in the aerosol composition.

3. The aerosol composition according to claim 1, wherein the inorganic powder or organic powder comprises silylated silica.

4. The aerosol composition according to any one of claims 1 to 3, wherein the content of the inorganic powder or organic powder is 3 to 40% by mass in the aerosol composition.

5. An aerosol product comprising an aerosol composition according to any one of claims 1 to 3, filled into an aerosol container.

6. A metered-dose aerosol product comprising an aerosol composition according to any one of claims 1 to 3, filled into an aerosol container equipped with a metered-dose spraying mechanism.

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