Aerosol composition, skin cooling method, and method for forming a composition layer

Abstract

In view of the above-mentioned problems, the present invention relates to providing a topical cooling aerosol composition for skin application that exhibits a high cooling effect and sustained cooling effect when applied to the skin, a method for cooling the skin using the same, and a method for forming a composition layer. [Solution] An aerosol composition for external use on the skin, comprising 0.1 to 3% by mass of carrageenan, stearoxyhydroxypropyl methylcellulose, or both, 0.5 to 20% by mass of a surfactant, and a liquefied gas.

Description

Technical Field

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[0001] The present invention relates to an aerosol composition having a high cooling effect and its lasting effect when attached to an adherent such as skin, a skin cooling method using the same, a method for forming a composition layer, and the like.

Background Art

[0002] Hitherto, as a composition that gives a cooling sensation, there is an aerosol composition comprising an aqueous stock solution for aerosol containing 50% by weight or more of water and an aerosol propellant having a boiling point of 5°C or less or a mixture of an aerosol propellant and an ejection aid (see, for example, Patent Document 1). This aerosol composition is composed of an aqueous stock solution for aerosol containing 50% by weight or more of water and an aerosol propellant having a boiling point of 5°C or less or a mixture of an aerosol propellant and an ejection aid. When sprayed in a mist form on the application surface, part or almost all of the aqueous stock solution cooled by the heat of vaporization of the propellant adheres to the application surface in a frozen or snow-covered state.

[0003] However, in the conventional compositions that give a cooling sensation, even though there is a cooling sensation, the actual temperature drop on the attached skin or the like is small, and the cooling sensation is instantaneously lost. Further, when attached to the skin or the like by an aerosol propellant or application, the attached portion is sticky and the usability is poor.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of the above problems and the like, an object of the present invention is to provide an aerosol composition having a high cooling effect and its lasting effect when attached to the skin or the like, a skin cooling method using the same, a method for forming a composition layer, and the like. [Means for solving the problem]

[0006] As a result of diligent research to solve the above problems, the present inventors succeeded in creating the following aerosol composition that can be used as a cooling aerosol, etc., and found that the above objectives can be achieved by the above aerosol composition, an aerosol composition using the same, a skin cooling method, and a composition formation method, etc., thus completing the present invention.

[0007] In other words, the present invention provides the following aerosol compositions.

[0008] [1] A cooling aerosol composition for external skin application, comprising 0.1 to 3% by mass of carrageenan, steaoxyhydroxypropyl methylcellulose, or both, 0.5 to 20% by mass of a surfactant, and a liquefied gas.

[0009] [2] Furthermore, the composition according to [1] contains 0.1 to 7% by mass of menthol.

[0010] [3] Furthermore, the composition according to [1] further comprises 0.1% to 5% by mass of talc or silica or both.

[0011] [4] A cooling aerosol composition for external skin application, comprising the aerosol composition described in any of [1] to [3].

[0012] Furthermore, the present invention provides the following skin cooling method.

[0013] [5] A skin cooling method comprising the step (1) of applying an aerosol composition described in any of [1] to [3] to the skin.

[0014] [6] The method according to [5], wherein in step (1) above, the diameter or approximate diameter of the nozzle for spraying the composition is 0.3 mm to 5 mm.

[0015] [7] The method according to [6], wherein the surface temperature of the composition layer formed by adhesion is maintained at 10°C or lower for 30 seconds after adhesion.

[0016] [8] The method according to [7], wherein the composition layer is in a solid, foam, or sherbet form.

[0017] The present invention also provides a method for forming the following composition layer.

[0018] [9] A method for forming a composition layer, comprising the step (2) of adhering the aerosol composition according to any one of [1] to [3] to the skin to form a composition layer.

[0019]

[10] The method according to [9], wherein the composition layer is in a solid, foam, or sherbet form. [Advantages of the Invention]

[0020] The composition of the present invention can bring about a high cooling effect and its lasting effect when adhered to the skin or the like.

[0021] Moreover, the skin cooling method of the present invention can bring about a high cooling effect and its lasting effect on the adhered skin or the like by using the aerosol composition.

[0022] Furthermore, the method for forming the composition layer of the present invention can bring about a layer having a high cooling effect and its lasting effect on the adhered skin or the like by using the aerosol composition. [Modes for Carrying Out the Invention]

[0023] Hereinafter, embodiments of the present invention will be described in detail.

[0024] [Aerosol Composition] The aerosol composition of the present invention comprises, for example, 0.1 to 3% by mass of carrageenan, steaoxyhydroxypropyl methylcellulose, or both, 0.5 to 20% by mass of a surfactant, and a liquefied gas.

[0025] The aerosol composition of the present invention, having the above-described structure, can provide a high cooling effect and sustained cooling effect when applied to the skin or other surfaces. For this reason, it can be suitably used as a cooling aerosol composition, a composition for external skin application, a cooling aerosol composition for external skin application, and the like.

[0026] In the present invention, "cooling sensation" refers to the property or effect of giving a cold sensation or a feeling of reduced temperature when the composition is applied to a substrate such as skin by spraying or coating.

[0027] The above composition comprises carrageenan, stearohydroxypropyl methylcellulose, or both.

[0028] In the above composition, carrageenan obtained by known methods may be used as appropriate. The carrageenan content in the above composition is preferably, for example, 0.1 to 3% by mass, and may be 0.2 to 2.8% by mass, 0.3 to 2.6% by mass, 0.4 to 2.5% by mass, 0.5 to 2.3% by mass, 0.8 to 2.0% by mass, or 1.0 to 1.5% by mass.

[0029] In the above composition, stearoxyhydroxypropyl methylcellulose obtained by known methods may be used as appropriate. The content of stearoxyhydroxypropyl methylcellulose in the above composition is preferably, for example, 0.1 to 3% by mass, and may be 0.2 to 2.8% by mass, 0.3 to 2.6% by mass, 0.4 to 2.5% by mass, 0.5 to 2.3% by mass, 0.8 to 2.0% by mass, or 1.0 to 1.5% by mass.

[0030] Furthermore, if the above composition contains carrageenan and stearohydroxypropyl methylcellulose, the total amount thereof is preferably 0.1 to 3% by mass, and may be 0.2 to 2.8% by mass, 0.3 to 2.6% by mass, 0.4 to 2.5% by mass, 0.5 to 2.3% by mass, 0.8 to 2.0% by mass, or 1.0 to 1.5% by mass.

[0031] The above composition contains a surfactant. Known or novel surfactants may be used as appropriate.

[0032] Examples of the above-mentioned surfactants include anionic surfactants, nonionic surfactants, amphoteric surfactants, and cationic surfactants. These may be used individually or in combination of two or more types.

[0033] Examples of anionic surfactants include sodium lauryl sulfate (SLS), sodium dodecylbenzenesulfonate, and sodium α-olefin sulfonate.

[0034] Examples of nonionic surfactants include polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkyl ether, polysorbate (Tween), polyoxyethylene hydrogenated castor oil, and sucrose fatty acid ester.

[0035] Examples of amphoteric surfactants include sodium cocoamphoacetate, lauramidopropyl betaine, and alkyldimethylamine oxide.

[0036] Examples of cationic surfactants include benzalkonium chloride and cetylpyridinium chloride.

[0037] Among the surfactants mentioned above, nonionic surfactants are more preferred, and among them, polyoxyethylene polyoxypropylene alkyl ether is a particularly preferred example due to its cooling effect.

[0038] In the above composition, the surfactant content is preferably, for example, 0.5 to 20% by mass, and may be 0.6 to 19% by mass, 0.7 to 18% by mass, 1 to 15% by mass, 1.5 to 13% by mass, 2 to 10% by mass, 3 to 8% by mass, or 4 to 5% by mass.

[0039] The above composition contains a liquefied gas. The liquefied gas may be any known or novel liquefied gas as appropriate.

[0040] Examples of the liquefied gases mentioned above include hydrocarbon (LPG) liquefied gas, HFC (hydrofluorocarbon) liquefied gas, HFO (hydrofluoroolefin) liquefied gas, and DME (dimethyl ether). The liquefied gases may be used individually or in combination of two or more types.

[0041] Examples of hydrocarbon-based (LPG) liquefied gases include propane, n-butane, isobutane, and propane / butane mixtures.

[0042] Examples of HFC (hydrofluorocarbon) liquefied gases include HFC-134a (1,1,1,2-tetrafluoroethane) and HFC-152a (1,1-difluoroethane).

[0043] Examples of HFO (hydrofluoroolefin)-based liquefied gases include HFO-1234ze and HFO-1234yf.

[0044] Dimethyl ether (DME) can be any known type as appropriate.

[0045] In the above composition, the content of liquefied gas is preferably, for example, 20 to 98% by mass, and may be 30 to 95% by mass, 50 to 90% by mass, or 60 to 85% by mass.

[0046] Furthermore, the liquefied gas may contain a propellant. In this invention, a propellant refers to a solvent with a relatively low boiling point, having a boiling point above 5°C. Examples of the above propellant include trichloromonofluoromethane, trichlorotrifluoroethane, dichlorotrifluoroethane, isopentane, n-pentane, and hexane. These may be used individually or in combination of two or more.

[0047] The composition of the present invention may further contain menthol. Known menthols may be used as appropriate. The menthol content in the above composition is preferably, for example, 0.1 to 7% by mass, and may be 0.2 to 6.5% by mass, 0.3 to 6% by mass, 0.4 to 5.5% by mass, 0.5 to 5% by mass, 0.8 to 4% by mass, or 1 to 3% by mass, 1.5 to 2% by mass.

[0048] The composition of the present invention may further contain talc, silica, or both.

[0049] In this invention, talc refers to a type of mineral, specifically hydrated magnesium silicate. Known or novel talc may be used as appropriate. The inclusion of talc can improve, for example, slipperiness, hygroscopicity, dispersion stability, and other properties.

[0050] In the above composition, the talc content is preferably, for example, 0.1 to 7% by mass, and may be 0.2 to 6.5% by mass, 0.3 to 6% by mass, 0.4 to 5.5% by mass, 0.5 to 5% by mass, 0.8 to 4% by mass, 1 to 3% by mass, or 1.5 to 2% by mass.

[0051] In this invention, silica (silicon dioxide) refers to a naturally occurring mineral, silicon dioxide (SiO2). Known or novel silica can be used as appropriate. For example, very fine powders such as silica gel or ultrafine silica are preferred. The inclusion of silica can improve properties such as hygroscopicity, viscosity, smoothness, and texture.

[0052] In the above composition, the silica content is preferably, for example, 0.1 to 7% by mass, and may be 0.2 to 6.5% by mass, 0.3 to 6% by mass, 0.4 to 5.5% by mass, 0.5 to 5% by mass, 0.8 to 4% by mass, or 1 to 3% by mass, 1.5 to 2% by mass.

[0053] Furthermore, if the above composition contains talc and silica, the total amount thereof is preferably 0.1 to 3% by mass, and may be 0.2 to 2.8% by mass, 0.3 to 2.6% by mass, 0.4 to 2.5% by mass, 0.5 to 2.3% by mass, 0.8 to 2.0% by mass, or 1.0 to 1.5% by mass.

[0054] Furthermore, the above composition may appropriately contain known or novel solvents, as long as they do not impair the effects of the present invention. Examples of such solvents include water, ethanol, isopropanol, 1,3-butylene glycol, dipropylene glycol, and other lower alcohols, as well as other organic solvents. These may be used individually or in combination of two or more.

[0055] In the above composition, the solvent content is preferably, for example, 5 to 50% by mass, and may be 10 to 45% by mass, 15 to 40% by mass, or 20 to 30% by mass.

[0056] Furthermore, the above composition may appropriately contain known or novel thickeners, as long as they do not impair the effects of the present invention. Examples of such thickeners include water-soluble polymers. Examples of such water-soluble polymers include carboxyvinyl polymers, hydroxyethylcellulose, hydroxypropylcellulose, acrylic acid copolymers, polyacrylic acid or polyacrylate salts, and gums such as xanthan gum. These may be used individually or in combination of two or more.

[0057] Furthermore, the above composition may appropriately contain known or novel oil components, as long as they do not impair the effects of the present invention. Examples of such oil components include vegetable oils (jojoba oil, argan oil), silicone oils (cyclopentasiloxane, dimethicone), and ester oils (isopropyl isostearate, dicaprylyl ether). These may be used individually or in combination of two or more.

[0058] Furthermore, the above composition may appropriately contain known or novel plant extracts, as long as they do not impair the effects of the present invention. Examples of such plant extracts include aloe extract, peach leaf extract, mint extract, and peppermint extract. These may be used individually or in combination of two or more.

[0059] Furthermore, in the above composition, other known or novel components used in aerosol compositions may be used as appropriate, as long as they do not impair the effects of the present invention.

[0060] Other ingredients mentioned above include, for example, emulsifiers, humectants (e.g., glycerin, propylene glycol, sodium hyaluronate, etc.), preservatives (e.g., parabens (methylparaben, propylparaben), alcohols with preservative effects (phenoxyethanol, etc.)), fragrances (e.g., natural fragrances (lavender oil, lemongrass oil), synthetic fragrances (linalool, citral, etc.)), pH adjusters (e.g., acidic (citric acid), alkaline (triethanolamine)), stabilizers (e.g., metal chelating agents (EDTA)), antioxidants (e.g., tocopherol, etc.).

[0061] The composition of the present invention can be suitably used as a topical skin composition. Examples of applications as a topical skin composition include body powder (such as baby powder), deodorant spray, sunscreen spray, skin analgesic spray, skin protection spray, insect bite spray (anti-itch), antibacterial / disinfectant spray, skincare / moisturizing spray, and the like.

[0062] [Skin cooling method] The present invention provides a skin cooling method which includes the step (1) of applying the above aerosol composition to the skin.

[0063] The skin cooling method of the present invention, by using the above-mentioned aerosol composition, can provide a highly effective cooling effect and sustained cooling effect to a substrate such as skin to which it is applied.

[0064] In step (1) described above, the method for applying the aerosol composition to a substrate such as skin is not particularly limited and can be carried out as appropriate using known or novel methods.

[0065] Methods for applying the above-mentioned aerosol composition to the skin, etc. include, for example, spraying the aerosol composition directly onto the skin, spraying the aerosol composition directly onto the skin, etc., and then spreading it with fingers, hands, sponges, pads, etc., or spraying it directly onto the palm of the hand and then spreading it onto the skin.

[0066] In the present invention, "injection" means releasing an aerosol composition into the air, and includes, for example, spraying a substance in the form of fine particles, such as a mist or atomizer.

[0067] In step (1) above, when using an injection method, the diameter or approximate diameter of the nozzle for spraying the composition is preferably, for example, 0.3 mm to 5 mm. It is preferable that the diameter is 1.2 mm. The diameter or approximate diameter of the discharge port may be, for example, 0.4 mm to 1.1 mm, 0.5 mm to 1.0 mm, 0.6 mm to 0.9 mm, or 0.7 mm to 0.8 mm, 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc.

[0068] Furthermore, in the present invention, in step (1) above, it is possible to maintain the surface temperature of the composition layer formed by adhesion at 10°C or below for 30 seconds after adhesion to the adherend. In addition, for example, it is also possible to maintain the surface temperature of the composition layer formed by adhesion at 15°C or below for 30 seconds after adhesion, or to maintain the surface temperature of the composition layer formed by adhesion at 20°C or below for 30 seconds after adhesion.

[0069] Furthermore, it is desirable that the above-mentioned composition layer be in a solid, foamy, or sherbet-like state after being sprayed onto the adherend. The aerosol composition layer of the present invention has the above-mentioned components and other elements, and it is presumed that by having all or almost all of the above-mentioned composition in the above-mentioned state as ice or snow, it efficiently provides a high cooling effect and a sustained cooling effect on the adherend. However, the scope of the rights is not limited to the above-mentioned mechanism only.

[0070] Furthermore, the above composition layer may be uniform or non-uniform with respect to the adherend. Even if its form changes or it disintegrates over time, it is sufficient that part or all of it exists as a material layer for a period of time during which the effects of the present invention can be realized. [Examples]

[0071] The following describes examples that specifically illustrate the structure and effects of the present invention. However, the content of the present invention is not limited to the following examples.

[0072] [Examples 1-9, Comparative Examples 1-2] Based on the ingredient types and formulations shown in Table 1, stock solutions for each aerosol composition were prepared. Next, these stock solutions were stored in containers together with LPG (liquefied petroleum gas) to prepare aerosols containing the aerosol compositions. Aloe extract was used as the plant extract.

[0073] The following evaluations were performed using each of the obtained aerosols. The spray nozzle (cylindrical) of each aerosol was 1 mm in diameter.

[0074] (Cooling sensation confirmation test) Each aerosol was sprayed onto the forearm of the subject, and the dispensed liquid (approximately 0.5g) was spread on the forearm with a finger. The subject was then evaluated according to the following evaluation criteria. Five in-house researchers, whose evaluation criteria for cooling sensation had been standardized beforehand, were used as subjects, and the evaluation was based on the average of the results of these five subjects. ◎ I felt a strong sense of coldness. I felt a cold sensation. △ I felt a slight chill. × I didn't feel any cooling sensation.

[0075] (Cooling sensation duration test) For each aerosol, the liquid content (approximately 0.5g) dispensed from each aerosol was placed on a hot plate heated to 35°C, 36°C, or 37°C, and the temperature was measured using thermography. The results were then evaluated according to the following evaluation criteria. ◎ If the temperature is below 10℃ after 30 seconds ○ If the temperature is between 10°C and 15°C after 30 seconds △ If the temperature is between 15°C and 20°C after 30 seconds × If the temperature is 20°C or higher after 30 seconds

[0076] (Test to confirm user experience) Each aerosol was sprayed onto the forearm of the subject, and the dispensed liquid (approximately 0.5g) was spread on the forearm with a finger. The evaluation was then conducted according to the following criteria. Five in-house researchers, who had previously standardized the evaluation criteria for usability, were used as subjects, and the evaluation was based on the average of the results of these five individuals. ◎ I didn't feel any stickiness. ○ I hardly felt any stickiness. △ I felt it was sticky. × I felt it was very sticky.

[0077] Table 1 is shown below. Note that the unit in the table is parts by mass.

[0078] [Table 1]

[0079] As shown in Table 1, in all of the examples, sufficient cooling sensation was provided to the applied area, and the temperature remained below 10°C after 30 seconds for substrates at 35°C, 36°C, and 37°C. Furthermore, in all of the examples, the internal liquid did not become sticky on the substrate. In contrast, in the comparative examples, problems arose such as insufficient cooling sensation, failure to maintain a temperature below 10°C after 30 seconds for substrates at 35°C, 36°C, and 37°C, and stickiness of the internal liquid on the substrate.

[0080] Thus, it was found that when the aerosol composition of the present invention is used, it provides sufficient cooling sensation to the area to which it is applied, such as human skin, and that the cooling effect can be maintained at less than 10°C even after 30 seconds on a surface at body temperature, while also preventing dripping when using the internal solution and providing a superior user experience.

Claims

1. A cooling aerosol composition for external skin application, comprising 0.1 to 3% by mass of carrageenan, stearoxyhydroxypropyl methylcellulose, or both, 0.5 to 20% by mass of a surfactant, and a liquefied gas.

2. Furthermore, the composition according to claim 1, further comprising 0.1 to 7% by mass of menthol.

3. Furthermore, the composition according to claim 1, further comprising 0.1% to 5% by mass of talc or silica or both.

4. A composition according to any one of claims 1 to 3, which is a cooling aerosol composition for external skin application.

5. A method for cooling skin, comprising the step (1) of applying an aerosol composition according to any one of claims 1 to 3 to the skin.

6. The method according to claim 5, wherein in step (1), the diameter or approximate diameter of the nozzle for spraying the composition is 0.3 mm to 5 mm.

7. The method according to claim 6, wherein the surface temperature of the composition layer formed by adhesion is maintained at 10°C or below for 30 seconds after adhesion.

8. The method according to claim 7, wherein the composition layer is in the form of a solid, a foam, or a sherbet.

9. A method for forming a composition layer, comprising the step (2) of applying the aerosol composition according to any one of claims 1 to 3 to the skin to form a composition layer.

10. The method according to claim 9, wherein the composition layer is in the form of a solid, a foam, or a sherbet.

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