Foamable aerosol composition

Abstract

To provide a foamable aerosol composition that forms foam resistant to dripping, is easy to apply to a target object, and produces a warming sensation when spread.SOLUTION: A foamable aerosol composition comprises a stock solution containing an associative viscosity modifier, a pH adjuster, and a polyhydric alcohol, and a propellant containing liquefied gas and carbon dioxide gas.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a foamable aerosol composition. More specifically, the present invention relates to a foamable aerosol composition that can form a foam that does not drip easily, is easy to apply to an object, and provides a warming sensation when spread. [Background technology]

[0002] Foamable aerosol compositions that can form bubbles (foam) when discharged have been developed. Patent Document 1 discloses an aerosol composition that can impart a warming sensation to an object. Patent Document 2 discloses a foamable aerosol composition that can be foamed without substantially containing a surfactant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3027838 [Patent Document 2] Patent No. 4722434 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the aerosol composition described in Patent Document 1 contains a polyhydric alcohol and a foam stabilizer, which causes sticky foam when dispensed. Furthermore, the aerosol composition described in Patent Document 1 forms low-foaming, easily breakable foam. Therefore, the resulting foam tends to drip and is difficult to apply to an object. The foamable aerosol composition described in Patent Document 2 cannot impart a warming sensation to an object.

[0005] The present invention has been made in consideration of such conventional problems, and aims to provide a foamable aerosol composition that can form foam that does not drip easily, is easy to apply to an object, and provides a warming sensation when spread. [Means for solving the problem]

[0006] The present invention, which solves the above problems, mainly comprises the following configuration.

[0007] (1) A foamable aerosol composition comprising a concentrate containing an associative viscosity modifier, a pH adjuster, and a polyhydric alcohol, and a propellant containing a liquefied gas and carbon dioxide gas.

[0008] According to this configuration, the foamable aerosol composition has fluidity and is easy to discharge, and when discharged to the outside, it can form a foam that is slightly viscous and does not drip easily. Therefore, the foam is easy to apply to an object. In addition, the foam can impart a warming sensation.

[0009] (2) The foamable aerosol composition according to (1), wherein the content of the polyhydric alcohol in the concentrate is 60 to 99.5% by mass.

[0010] According to this configuration, the foamable aerosol composition foams easily, and by spreading the resulting foam, it is easy to impart a warming sensation to an object.

[0011] (3) The foamable aerosol composition according to (1) or (2), wherein the content of the liquefied gas in the aerosol composition is 2 to 25% by mass.

[0012] According to this configuration, the foamable aerosol composition foams easily, and the foam obtained is less likely to drip and easily imparts a warming sensation to the object. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a foamable aerosol composition that can form foam that does not drip easily, is easy to apply to an object, and provides a warming sensation when spread. DETAILED DESCRIPTION OF THE INVENTION

[0014] <Foamable aerosol composition> A foaming aerosol composition (hereinafter also referred to as an aerosol composition) according to one embodiment of the present invention comprises a concentrate containing an associative viscosity modifier, a pH adjuster, and a polyhydric alcohol, and a propellant containing a liquefied gas and carbon dioxide gas. Each of these components will be described below.

[0015] (Undiluted) The concentrate contains an associative viscosity modifier, a pH adjuster, and a polyhydric alcohol.

[0016] ·Associative viscosity modifier Associative viscosity modifiers are used for purposes such as suppressing the separation of liquefied gas when carbon dioxide gas is dissolved in the concentrate, and forming viscous foam that does not drip easily when discharged.

[0017] The associative viscosity modifier is not particularly limited. Examples of the associative viscosity modifier include a copolymer of acrylic acid and itaconic acid ester, polyurethane, etc. More specifically, the associative viscosity modifier includes an (acrylates / steareth-20 itaconate) copolymer, an (acrylates / ceteth-20 itaconate) copolymer, an (acrylates / aminoacrylate / C10-30 alkyl PEG-20 itaconic acid) copolymer, polyurethane, etc.

[0018] The content of the associative viscosity modifier is not particularly limited. For example, the content of the associative viscosity modifier is preferably 0.1% by mass or more, and more preferably 0.2% by mass or more, based on the solid content, in the concentrate. Furthermore, the content of the associative viscosity modifier is preferably 3.0% by mass or less, and more preferably 2.5% by mass or less, based on the solid content, in the concentrate. By having the content of the associative viscosity modifier within the above range, the aerosol composition can foam the concentrate containing a polyhydric alcohol to form foam that does not drip easily. Furthermore, the aerosol composition easily dissolves carbon dioxide gas in the concentrate, thereby suppressing separation of the liquefied gas and facilitating discharge with a uniform composition.

[0019] pH adjuster The pH adjuster is used for purposes such as adjusting the viscosity of the concentrate by associating the associative viscosity adjuster, and forming foam that is moderately viscous and does not drip easily when discharged.

[0020] The pH adjuster is not particularly limited. Examples of the pH adjuster include organic alkalis such as triethanolamine, 2-amino-2-methyl-1-propanol, and 2-amino-2-methyl-1,3-propanediol, inorganic alkalis such as potassium hydroxide, sodium hydroxide, and ammonium hydroxide, organic acids such as citric acid, glycolic acid, lactic acid, and phosphoric acid, and inorganic acids such as hydrochloric acid.

[0021] The content of the pH adjuster is not particularly limited. For example, the content of the pH adjuster is preferably 0.1 times or more, more preferably 0.2 times or more, by mass, relative to the solid content of the associative viscosity modifier. Furthermore, the content of the pH adjuster is preferably 1 time or less, more preferably 0.8 times or less, by mass, relative to the solid content of the associative viscosity modifier. When the content of the pH adjuster is within the above range, the aerosol composition can adjust the viscosity of the concentrate by associating the associative viscosity modifier, and easily form foam that is less likely to drip.

[0022] Polyhydric alcohol Polyhydric alcohol is the main solvent in the concentrate, and is used to form a foam that does not drip easily and to give a warm feeling when spread.

[0023] The polyhydric alcohol is not particularly limited. For example, the polyhydric alcohol may be a trihydric alcohol such as glycerin, or a dihydric alcohol such as 1,3-butylene glycol or propylene glycol. Among these, the polyhydric alcohol preferably contains glycerin. This allows the aerosol composition to foam easily when ejected and to be less likely to drip. Furthermore, the resulting foam easily imparts a warming sensation to the target object.

[0024] The content of the polyhydric alcohol is not particularly limited. For example, the content of the polyhydric alcohol in the concentrate is preferably 60% by mass or more, and more preferably 70% by mass or more. Furthermore, the content of the polyhydric alcohol in the concentrate is preferably 99.5% by mass or less, and more preferably 99% by mass or less. When the content of the polyhydric alcohol is within the above range, the aerosol composition is more likely to form a foam that does not drip easily, and a warm feeling is more likely to be obtained when spread. In particular, when glycerin is contained, a warm feeling is more likely to be obtained, and the content of glycerin in the concentrate is preferably 40% by mass or more, and more preferably 45% by mass or more. Furthermore, the content of glycerin in the concentrate is preferably 99.5% by mass or less, and more preferably 99% by mass or less. This makes it easier for the aerosol composition to form a foam that does not drip easily, and a warm feeling is more likely to be obtained when spread.

[0025] Returning to the explanation of the concentrate as a whole, the concentrate may contain, in addition to the above-mentioned associative viscosity modifier, pH adjuster, and polyhydric alcohol, various active ingredients, surfactants, water, monohydric alcohols, water-soluble polymers, oils, powders, etc.

[0026] The active ingredient is not particularly limited. The active ingredient can be appropriately selected depending on the application and purpose. Examples of the active ingredient include cooling agents such as 1-menthol and camphor, antiperspirants such as chlorohydroxyaluminum and isopropylmethylphenol, astringents such as zinc oxide, allantoin hydroxyaluminum and citric acid, anti-inflammatory agents such as allantoin, glycyrrhetinic acid, dipotassium glycyrrhizinate and azulene, antipruritics such as crotamiton and d-camphor, anti-inflammatory analgesics such as methyl salicylate, indomethacin, piroxicam, felbinac and ketoprofen, antifungals such as oxiconazole, clotrimazole, sulconazole, bifonazole, miconazole, isoconazole, econazole, tioconazole, butenafine and their hydrochlorides, nitrates and acetates, dibuccine hydrochloride and the like. Local anesthetics such as tetracaine hydrochloride, lidocaine hydrochloride, antihistamines such as diphenhydramine, diphenhydramine hydrochloride, chlorpheniramine maleate, bactericides and disinfectants such as parahydroxybenzoates, sodium benzoate, phenoxyethanol, benzalkonium chloride, benzethonium chloride, chlorhexidine chloride, moisturizers such as collagen, xylitol, sorbitol, hyaluronic acid, caronic acid, sodium lactate, dl-pyrrolidone carboxylate, keratin, lecithin, urea, deodorants such as lauric acid methacrylate, methyl benzoate, methyl phenylacetate, geranyl clotrate, acetophenone myristate, benzyl acetate, benzyl propionate, N,Pest repellents such as N-diethyl-m-toluamide (DEET) and caprylic acid diethylamide, UV absorbers such as diethylaminohydroxybenzoyl hexyl benzoate, 2-ethylhexyl paramethoxycinnamate, ethylhexyl triazone, oxybenzone, hydroxybenzophenone sulfonic acid, dihydroxybenzophenone sodium sulfonate, and dihydroxybenzophenone, UV scattering agents such as zinc oxide and titanium oxide, retinol, retinol acetate, retinol palmitate, calcium pantothenate, and ascorbyl palmitate. Vitamins such as lactic acid, sodium ascorbate, dl-α-tocopherol, tocopherol acetate, tocopherol, and mixtures thereof; antioxidants such as ascorbic acid, α-tocopherol, and dibutylhydroxytoluene; extracts such as peony extract, loofah extract, rose extract, lemon extract, aloe extract, calamus root extract, eucalyptus extract, sage extract, tea extract, seaweed extract, placenta extract, and silk extract; whitening agents such as arbutin and kojic acid; and various fragrances such as natural and synthetic fragrances.

[0027] When an active ingredient is blended, the content of the active ingredient is not particularly limited. For example, the content of the active ingredient in the concentrate is preferably 0.01% by mass or more, more preferably 0.1% by mass or more. Furthermore, the content of the active ingredient is preferably 20% by mass or less, more preferably 15% by mass or less. When the content of the active ingredient is within the above range, the aerosol composition can easily impart the effects of the active ingredient to the target object along with a warming sensation by applying the discharged foam to the target object.

[0028] The surfactant is used for the purpose of assisting foaming, etc. The surfactant is not particularly limited. Examples of the surfactant include polyoxyethylene sorbitan fatty acid esters such as POE sorbitan monolaurate, POE sorbitan monostearate, and POE sorbitan monooleate; polyoxyethylene alkyl ethers such as POE cetyl ether, POE stearyl ether, POE oleyl ether, POE lauryl ether, POE behenyl ether, POE octyldodecyl ether, POE isocetyl ether, and POE isostearyl ether; polyoxyethylene polyoxypropylene alkyl ethers such as POE·POP cetyl ether and POE·POP decyltetradecyl ether; polyoxyethylene glycerin fatty acid esters such as POE glyceryl monostearate; polyoxyethylene hydrogenated castor oils such as POE hydrogenated castor oil; polyethylene glycol fatty acid esters such as polyethylene glycol monostearate; hexaglyceryl monolaurate, hexaglyceryl monomyristate, pentaglyceryl monolaurate, and pentaglyceryl monomyristate. nonionic surfactants such as polyglycerin fatty acid esters such as glyceryl, pentaglyceryl monooleate, pentaglyceryl monostearate, decaglyceryl monolaurate, decaglyceryl monomyristate, decaglyceryl monostearate, decaglyceryl monoisostearate, decaglyceryl monooleate, and decaglyceryl monolinoleate; polyoxyethylene glycerin fatty acid esters such as POE glyceryl monooleate; polyoxyethylene sorbit fatty acid esters such as POE sorbit monolaurate, POE sorbit tetrastearate, and POE sorbit tetraoleate; fatty acid alkanolamides such as coconut oil fatty acid diethanolamide, coconut oil fatty acid monoethanolamide, lauric acid diethanolamide, and lauric acid monoisopropanolamide; sorbitan fatty acid esters such as sorbitan monolaurate and sorbitan monostearate; and monoglycerin fatty acid esters such as glyceryl monomyristate and glyceryl monostearate;Anionic surfactants include saponified fatty acids such as myristic acid and stearic acid with alkalis such as triethanolamine and potassium; alkyl phosphates such as potassium lauryl phosphate and sodium lauryl phosphate; polyoxyethylene alkyl ether phosphates; alkyl sulfates; polyoxyethylene alkyl ether sulfates; alkyl ether carboxylates; and sulfonates; amino acid anionic surfactants such as N-acyl glutamates, N-acyl glycines, N-acylalanines, and acylalanines; silicone surfactants such as polyoxyethylene-methylpolysiloxane copolymers, polyoxypropylene-methylpolysiloxane copolymers, and poly(oxyethylene-oxypropylene)-methylpolysiloxane copolymers; and amphoteric surfactants such as lauryl dimethylaminoacetic acid betaine (lauryl betaine), stearyl betaine, and coconut oil fatty acid amidopropyl dimethylaminoacetic acid betaine (cocamidopropyl betaine);

[0029] When a surfactant is blended, the content of the surfactant is not particularly limited. For example, the content of the surfactant in the concentrate is preferably 0.05% by mass or more, more preferably 0.1% by mass or more. Furthermore, the content of the surfactant in the concentrate is preferably 10% by mass or less, more preferably 8% by mass or less. When the content of the surfactant is within the above range, the foaming property of the aerosol composition is easily assisted appropriately.

[0030] Water is an auxiliary solvent for the concentrate and is used for purposes such as adjusting foaming properties and foam viscosity, and improving the feel when used.

[0031] The water is not particularly limited, and examples thereof include purified water, ion-exchanged water, deep sea water, and alkaline ionized water.

[0032] When water is blended, the content of water is not particularly limited. For example, the content of water in the concentrate is preferably 0.1% by mass or more, more preferably 0.3% by mass or more. Furthermore, the content of water in the concentrate is preferably 30% by mass or less, more preferably 25% by mass or less. By having the water content within the above range, the aerosol composition is more likely to achieve the effects of adjusting foaming properties and foam viscosity and improving usability without impairing the warming sensation.

[0033] Monohydric alcohols are used to improve the feel of use.

[0034] The monohydric alcohol is not particularly limited, and examples of the monohydric alcohol include ethanol and isopropanol.

[0035] When a monohydric alcohol is blended, the content of the monohydric alcohol is not particularly limited. For example, the content of the monohydric alcohol in the concentrate is preferably 0.1% by mass or more, more preferably 0.3% by mass or more. Furthermore, the content of the monohydric alcohol in the concentrate is preferably 20% by mass or less, more preferably 15% by mass or less. When the content of the monohydric alcohol is within the above range, the aerosol composition is likely to achieve an effect of improving the feel of use without reducing the foaming property.

[0036] The water-soluble polymer is used for purposes such as adjusting the viscosity of the concentrate or foam.

[0037] The water-soluble polymer is not particularly limited. Examples of the water-soluble polymer include cellulose polymers such as cellulose nanofiber, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, and sodium carboxymethyl cellulose, gums such as xanthan gum, carrageenan, gum arabic, gum tragacanth, cationized guar gum, guar gum, and gellan gum, dextran, sodium carboxymethyl dextran, dextrin, pectin, sodium alginate, sodium hyaluronate, and polyvinyl alcohol.

[0038] When a water-soluble polymer is blended, the content of the water-soluble polymer is not particularly limited. For example, the content of the water-soluble polymer in the concentrate is preferably 0.01% by mass or more, more preferably 0.03% by mass or more. Furthermore, the content of the water-soluble polymer in the concentrate is preferably 3% by mass or less, more preferably 2% by mass or less. When the content of the water-soluble polymer is within the above range, the viscosity of the concentrate and foam of the aerosol composition can be easily adjusted to an appropriate range.

[0039] Oils are used to increase moisturizing power and make the product easier to spread.

[0040] The oil is not particularly limited. Examples of the oil include silicone oils such as dimethicone, methylpolysiloxane, cyclopentasiloxane, cyclohexasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, methylcyclopolysiloxane, tetrahydrotetramethylcyclotetrasiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, methylhydrogenpolysiloxane, and methylphenylpolysiloxane; decane; , dodecane, tetradecane, hexadecane, octadecane, liquid paraffin, isoparaffin, squalane, squalene and other hydrocarbon oils, methylpentanediol dineopentanoate, diethylpentanediol dineopentanoate, neopentyl glycol di-2-ethylhexanoate, neopentyl glycol dicaprate, propylene glycol dilaurate, ethylene glycol distearate, diethylene glycol dilaurate, diethylene glycol distearate, diisostearate These include ester oils such as diethylene glycol tearate, diethylene glycol dioleate, triethylene glycol dilaurate, triethylene glycol distearate, triethylene glycol diisostearate, triethylene glycol dioleate, propylene glycol monostearate, propylene glycol monooleate, ethylene glycol monostearate, glyceryl tri-2-ethylhexanoate, caprylic / capric triglyceride, isononyl isononanoate, isotridecyl isononanoate, diethoxyethyl succinate, diisostearyl malate, isopropyl myristate, isopropyl palmitate, cetyl isooctanoate, octyl hydroxystearate, and ethylhexyl hydroxystearate; oils and fats such as olive oil, camellia oil, corn oil, castor oil, safflower oil, jojoba oil, and coconut oil; fatty acids such as isostearic acid and oleic acid; and higher alcohols such as oleyl alcohol and isostearyl alcohol.

[0041] When an oil is blended, the content of the oil is not particularly limited. For example, the content of the oil in the concentrate is preferably 0.1% by mass or more, more preferably 0.2% by mass or more. Furthermore, the content of the oil in the concentrate is preferably 15% by mass or less, more preferably 10% by mass or less. When the content of the oil is within the above range, separation of the oil in the aerosol composition is suppressed when carbon dioxide gas is dissolved in the concentrate. As a result, the aerosol composition is easily discharged with a uniform composition, and effects such as increased moisturizing power are easily obtained.

[0042] The powder is used for the purpose of improving the feeling of use.

[0043] The powder is not particularly limited, and examples thereof include talc, silica, zeolite, zinc oxide, titanium oxide, kaolin, mica, magnesium carbonate, calcium carbonate, zinc silicate, magnesium silicate, aluminum silicate, and calcium silicate.

[0044] When a powder is blended, the content of the powder is not particularly limited. For example, the content of the powder in the concentrate is preferably 0.01% by mass or more, more preferably 0.05% by mass or more. Furthermore, the content of the powder in the concentrate is preferably 10% by mass or less, more preferably 5% by mass or less. When the content of the powder is within the above range, the aerosol composition is easily discharged with a uniform composition, and the effect of the powder is easily obtained.

[0045] The method for preparing the stock solution is not particularly limited. For example, the stock solution can be prepared by preparing a main agent in which an associative viscosity modifier is dissolved in a polyhydric alcohol and a secondary agent in which a pH adjuster is dissolved in a polyhydric alcohol, and then adding the secondary agent to the main agent to associate the associative viscosity modifier. Optional components such as active ingredients may be added to the main agent or the secondary agent.

[0046] The content of the concentrate is not particularly limited. For example, the content of the concentrate in the aerosol composition is preferably 75% by mass or more, and more preferably 80% by mass or more. The content of the concentrate in the aerosol composition is preferably 98% by mass or less, and more preferably 97% by mass or less. When the content of the concentrate is within the above range, the ejected aerosol composition becomes a foam that does not drip easily due to the liquefied gas described below, making it easy to apply to the affected area and easily obtaining the effects of the warming sensation and active ingredients.

[0047] (propellant) The propellant includes liquefied gas and carbon dioxide gas.

[0048] Liquefied gas The liquefied gas is a liquid having vapor pressure inside the aerosol container, and when discharged from the aerosol container to the outside, it vaporizes and foams the concentrate.

[0049] The liquefied gas is not particularly limited. Examples of the liquefied gas include liquefied petroleum gas, which is propane, normal butane, isobutane, and mixtures thereof, hydrofluoroolefins such as trans-1,3,3,3-tetrafluoropropene, dimethyl ether, and mixtures thereof. The liquefied gas is preferably a liquefied petroleum gas having a pressure of 0.15 to 0.3 MPa at 25°C, because it is easy to fill the required amount of carbon dioxide gas, which will be described later, and it is easy to obtain the effect of suppressing separation of the liquefied gas by dissolving it in the raw liquid.

[0050] The content of the liquefied gas is not particularly limited. For example, the content of the liquefied gas in the aerosol composition is preferably 2% by mass or more, and more preferably 3% by mass or more. Furthermore, the content of the liquefied gas in the aerosol composition is preferably 25% by mass or less, and more preferably 20% by mass or less. When the content of the liquefied gas is within the above range, the aerosol composition tends to foam the concentrate to form a foam that is less likely to drip. The resulting foam is easy to apply to an object and easily imparts effects such as a warming sensation or active ingredients.

[0051] Carbon dioxide Carbon dioxide gas dissolves partially in the concentrate in the aerosol container, shifting the pH of the liquid phase toward the acidic side, improving the fluidity of the aerosol composition and making it easier to eject, and suppressing separation of the liquefied gas.

[0052] The content of carbon dioxide gas is not particularly limited. For example, the content of carbon dioxide gas in the aerosol composition is preferably 0.1% by mass or more, and more preferably 0.2% by mass or more. Furthermore, the content of carbon dioxide gas in the aerosol composition is preferably 3% by mass or less, and more preferably 2% by mass or less. When the content of carbon dioxide gas is within the above range, the carbon dioxide gas dissolves in the concentrate, improving the fluidity of the aerosol composition and making it easier to discharge, and the effect of suppressing separation of the liquefied gas is easily achieved.

[0053] Returning to the overall description of the aerosol composition, the method for preparing the aerosol composition is not particularly limited. For example, the aerosol composition can be prepared by filling a pressure-resistant container with a concentrate, attaching a valve to the pressure-resistant container and sealing it, then filling the container with liquefied gas through the valve and mixing it with the concentrate, and then filling the container with carbon dioxide gas through the valve. According to this preparation method, the pH of the concentrate is adjusted to near neutral (approximately 6 to 8) using a pH adjuster. Therefore, the associative viscosity modifier in the concentrate enters an associative state, increasing the viscosity of the concentrate. In contrast, the addition of liquefied gas and carbon dioxide shifts the pH to the acidic side (approximately 3 to 7). This somewhat dissolves the associative state of the associative viscosity modifier, reducing the viscosity of the resulting aerosol composition and making it more flowable. Furthermore, the aerosol composition of this embodiment can maintain a homogenized state of the liquefied gas and concentrate. This allows the aerosol composition of this embodiment to form a foam that is slightly viscous and less likely to drip. Therefore, the foam is easily applied to a target object. The foam can provide a warming sensation when spread. Furthermore, since the foamable aerosol composition contains carbon dioxide gas, separation of the liquefied gas is less likely to occur when the foamable aerosol composition is filled in an aerosol product, and the composition is likely to be discharged with a uniform composition.

[0054] <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 aerosol composition described above. The aerosol container mainly comprises a container body filled with the aerosol composition, a valve attached to an opening of the container body, and a discharge member attached to the valve.

[0055] The container body is a container filled with the aerosol composition, and is cylindrical with a bottom. A valve is attached to the opening of the container body.

[0056] The material of the container body is not particularly limited, and examples of the material of the container body include metals such as aluminum and tinplate, various synthetic resins, and pressure-resistant glass.

[0057] The valve is a member for closing and sealing the opening of the container body and discharging the aerosol composition. There are no particular limitations on the valve. The valve mainly comprises a housing, a stem that is fitted into the housing from the upper end and has a stem hole that communicates between 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 sucking up the aerosol composition inside the container body, and a biasing member for biasing the stem upward. A discharge member for discharging the aerosol composition is attached to the upper end of the stem.

[0058] The discharge member is a member for discharging the aerosol composition by opening and closing the valve, and is attached to the upper end of the stem. The discharge member mainly comprises a nozzle portion having a discharge hole formed therein and an operating portion that is operated by the user's finger or the like. The aerosol composition is discharged from the discharge hole.

[0059] When filled with the aerosol composition, the internal pressure of the aerosol product at 25°C is preferably 0.25 MPa or more, more preferably 0.3 MPa or more. Furthermore, the internal pressure of the aerosol product is preferably 0.7 MPa or less, more preferably 0.6 MPa or less. By having the internal pressure of the aerosol product within the above range, carbon dioxide gas dissolves in the concentrate, improving the fluidity of the aerosol composition and also improving the foaming properties of the aerosol composition when dispensed.

[0060] In the aerosol product of this embodiment, when the discharge member is depressed, the stem of the valve is pushed downward. This causes the stem rubber to bend downward, opening the stem hole. As a result, the inside of the container body is connected to the outside, and the pressure of the aerosol composition causes the aerosol composition in the container body to pass through the stem hole and the stem passage, be sent to the discharge member, and then be discharged from the discharge hole.

[0061] The discharged aerosol composition becomes foamy as the liquefied gas and carbon dioxide gas vaporize, causing the concentrate to foam. The foam is slightly viscous and does not drip easily. Furthermore, the foam is easy to apply to an object and can provide a warming sensation when spread. [Example]

[0062] The present invention will be described in more detail below with reference to examples. The present invention is not limited to these examples. Unless otherwise specified, "%" means "% by mass" and "parts" means "parts by mass."

[0063] Example 1 According to the formulations listed in Table 1 below, main component A and auxiliary component A were prepared separately, and auxiliary component A was added to main component A to prepare concentrate A. 54 g (89.48%) of concentrate A was filled into a transparent glass pressure-resistant container (full capacity 98 mL), and a valve was attached to the pressure-resistant container. 6 g (9.94%) of liquefied petroleum gas with a pressure of 0.20 MPa at 25°C was filled through the valve, and the concentrate and liquefied petroleum gas were mixed. 0.35 g (0.58%) of carbon dioxide gas was further filled through the valve, and the carbon dioxide gas was saturated and dissolved to prepare an aerosol composition. The pressure of the aerosol composition at 25°C was 0.40 MPa.

[0064] [Table 1]

[0065] Example 2 An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.76%) of stock solution A, 6 g (9.97%) of liquefied petroleum gas having a pressure of 0.35 MPa at 25°C, and 0.16 g (0.27%) of carbon dioxide were filled. The pressure of the aerosol composition at 25°C was 0.43 MPa.

[0066] Example 3 An aerosol composition was prepared in the same manner as in Example 1, except that 51 g (84.44%) of stock solution A, 9 g (14.97%) of liquefied petroleum gas having a pressure of 0.20 MPa at 25°C, and 0.4 g (0.66%) of carbon dioxide were filled. The pressure of the aerosol composition at 25°C was 0.42 MPa.

[0067] Example 4 An aerosol composition was prepared in the same manner as in Example 1, except that 57 g (94.46%) of stock solution A, 3 g (4.97%) of liquefied petroleum gas having a pressure of 0.20 MPa at 25°C, and 0.34 g (0.56%) of carbon dioxide were filled. The pressure of the aerosol composition at 25°C was 0.42 MPa.

[0068] Example 5 An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.21%) of stock solution A, 6 g (9.91%) of liquefied petroleum gas having a pressure of 0.20 MPa at 25°C, and 0.53 g (0.88%) of carbon dioxide were filled. The pressure of the aerosol composition at 25°C was 0.49 MPa.

[0069] Example 6 An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.72%) of stock solution A, 6 g (9.97%) of liquefied petroleum gas having a pressure of 0.20 MPa at 25°C, and 0.19 g (0.32%) of carbon dioxide were filled. The pressure of the aerosol composition at 25°C was 0.32 MPa.

[0070] Example 7 Main component B and auxiliary component B were prepared separately according to the formulations shown in Table 2 below, and auxiliary component B was added to main component B to prepare stock solution B. An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.51%) of stock solution B, 6 g (9.95%) of liquefied petroleum gas with a pressure of 0.20 MPa at 25°C, and 0.33 g (0.55%) of carbon dioxide were filled. The pressure of the aerosol composition at 25°C was 0.39 MPa.

[0071] [Table 2]

[0072] Example 8 Main component C and auxiliary component C were prepared separately according to the formulations shown in Table 3 below, and auxiliary component C was added to main component C to prepare stock solution C. An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.48%) of stock solution C, 6 g (9.94%) of liquefied petroleum gas with a pressure of 0.20 MPa at 25°C, and 0.35 g (0.58%) of carbon dioxide gas were filled. The pressure of the aerosol composition at 25°C was 0.41 MPa.

[0073] [Table 3]

[0074] Example 9 Main component D and auxiliary component D were prepared separately according to the formulations shown in Table 4 below, and auxiliary component D was added to main component D to prepare stock solution D. An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.52%) of stock solution D, 6 g (9.95%) of liquefied petroleum gas with a pressure of 0.20 MPa at 25°C, and 0.32 g (0.53%) of carbon dioxide gas were filled. The pressure of the aerosol composition at 25°C was 0.40 MPa.

[0075] [Table 4]

[0076] Example 10 Main component E and auxiliary component E were prepared separately according to the formulations shown in Table 5 below, and auxiliary component E was added to main component E to prepare stock solution E. An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.52%) of stock solution E, 6 g (9.95%) of liquefied petroleum gas with a pressure of 0.20 MPa at 25°C, and 0.32 g (0.53%) of carbon dioxide were filled. The pressure of the aerosol composition at 25°C was 0.40 MPa.

[0077] [Table 5]

[0078] Example 11 Main ingredient F and auxiliary ingredient F were prepared separately according to the formulations shown in Table 6 below, and auxiliary ingredient F was added to main ingredient F to prepare stock solution F. An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.52%) of stock solution F, 6 g (9.95%) of liquefied petroleum gas with a pressure of 0.20 MPa at 25°C, and 0.32 g (0.53%) of carbon dioxide were filled. The pressure of the aerosol composition at 25°C was 0.43 MPa.

[0079] [Table 6]

[0080] Example 12 Main ingredient G and auxiliary ingredient G were prepared separately according to the formulations shown in Table 7 below, and auxiliary ingredient G was added to main ingredient G to prepare stock solution G. An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.40%) of stock solution G, 6 g (9.93%) of liquefied petroleum gas with a pressure of 0.20 MPa at 25°C, and 0.40 g (0.66%) of carbon dioxide were filled. The pressure of the aerosol composition at 25°C was 0.42 MPa.

[0081] [Table 7]

[0082] Example 13 Main ingredient H and auxiliary ingredient H were prepared separately according to the formulations shown in Table 8 below, and auxiliary ingredient H was added to main ingredient H to prepare stock solution H. An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.46%) of stock solution H, 6 g (9.94%) of liquefied petroleum gas with a pressure of 0.20 MPa at 25°C, and 0.36 g (0.60%) of carbon dioxide gas were filled. The pressure of the aerosol composition at 25°C was 0.4 MPa.

[0083] [Table 8]

[0084] (Comparative Example 1) An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (90.00%) of stock solution A, 6 g (10.00%) of liquefied petroleum gas having a pressure of 0.20 MPa at 25°C, and no carbon dioxide gas were filled. The pressure of the aerosol composition at 25°C was 0.22 MPa.

[0085] (Comparative Example 2) An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.97%) of stock solution A, 6 g (9.98%) of liquefied petroleum gas having a pressure of 0.20 MPa at 25°C, and 0.14 g (0.23%) of nitrogen gas were added instead of carbon dioxide. The pressure of the aerosol composition at 25°C was 0.44 MPa.

[0086] (Comparative Example 3) Main ingredient I and auxiliary ingredient I were prepared separately according to the formulations shown in Table 9 below, and auxiliary ingredient I was added to main ingredient I to prepare stock solution I. An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.49%) of stock solution I, 6 g (9.94%) of liquefied petroleum gas with a pressure of 0.20 MPa at 25°C, and 0.34 g (0.56%) of carbon dioxide were filled. The pressure of the aerosol composition at 25°C was 0.40 MPa.

[0087] [Table 9]

[0088] Comparative Example 4 Main ingredient J and auxiliary ingredient J were prepared separately according to the formulations shown in Table 10 below, and auxiliary ingredient J was added to main ingredient J to prepare concentrate J. An aerosol composition was prepared in the same manner as in Example 1, except that 54 g (89.55%) of concentrate J, 6 g (9.95%) of liquefied petroleum gas with a pressure of 0.20 MPa at 25°C, and 0.30 g (0.50%) of carbon dioxide were filled. The pressure of the aerosol composition at 25°C was 0.40 MPa.

[0089] [Table 10]

[0090] The aerosol compositions prepared in Examples 1 to 13 and Comparative Examples 1 to 4 were evaluated for appearance, fluidity, foaming state, and feel in use by the following evaluation methods. The results are shown in Table 11.

[0091] 1. Appearance of the aerosol composition The aerosol container filled with the aerosol composition was immersed in a thermostatic water bath at 25°C for 30 minutes, and the appearance of the aerosol composition was observed according to the following evaluation criteria. (Evaluation criteria) A: The aerosol composition did not separate and had a uniform appearance. ○: The aerosol composition separated slightly. Δ: The aerosol composition separated but was easily mixed by shaking the container. ×: The aerosol composition was separated and did not mix easily even when the container was shaken.

[0092] 2. Flowability of the aerosol composition An aerosol container filled with the aerosol composition was immersed in a thermostatic water bath at 25°C for 30 minutes, and the fluidity of the aerosol composition was evaluated according to the following evaluation criteria when the aerosol container was turned from upright to sideways. (Evaluation criteria) ⊚: The aerosol composition flowed immediately when turned on its side. ○: The aerosol composition flowed slowly when placed on its side. Δ: The aerosol composition flowed slowly in less than 3 seconds after being turned over on its side. ×: The aerosol composition did not flow for 3 seconds or more even when turned sideways.

[0093] 3. Foaming state The aerosol composition was discharged onto the palm of a hand from an aerosol container that had been immersed in a thermostatic water bath at 25°C for 30 minutes, and the foaming state was evaluated according to the following evaluation criteria. (Evaluation criteria) ◯: The aerosol composition foamed into a viscous foam. Δ: The aerosol composition foamed slightly less, but became a viscous foam. ×: The aerosol composition hardly foamed and was in a liquid state.

[0094] 4.Easy to spread The aerosol composition was discharged onto the palm of the hand from an aerosol container that had been immersed in a thermostatic water bath at 25°C for 30 minutes, and the ease of spreading when spread on the back of the hand was evaluated according to the following evaluation criteria. (Evaluation criteria) ◯: The aerosol composition was spreadable without dripping. △: It dripped a little, but was able to be spread. ×: The aerosol composition was prone to dripping and difficult to spread.

[0095] 5. Warmth The aerosol composition was discharged onto the palm of the hand from an aerosol container that had been immersed in a thermostatic water bath at 25°C for 30 minutes, and the warmth felt when the composition was spread on the back of the hand was evaluated according to the following evaluation criteria. (Evaluation criteria) ○: A moderate warmth was obtained. △: There was a slight cooling sensation during spreading, but then a warming sensation was felt. ×: No warmth was felt.

[0096] [Table 11]

[0097] As shown in Table 11, the aerosol compositions of Examples 1 to 13 of the present invention did not separate or separated slightly, and even if they did separate, they were easily mixed and had appropriate fluidity. Furthermore, when discharged, these aerosol compositions were able to foam and form viscous foam, which was easy to spread and provided an appropriate warming sensation.

Claims

1. a stock solution containing an associative viscosity modifier, a pH adjuster, and a polyhydric alcohol; A foamable aerosol composition comprising a liquefied gas and a propellant containing carbon dioxide gas.

2. 2. The foamable aerosol composition according to claim 1, wherein the content of the polyhydric alcohol in the concentrate is 60 to 99.5% by mass.

3. 3. The foamable aerosol composition according to claim 1, wherein the content of the liquefied gas in the aerosol composition is 2 to 25% by mass.

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