Foaming aerosol composition, foaming aerosol product, and method for suppressing flammability

Abstract

To provide a foaming aerosol composition that can suppress combustibility when an open flame is brought close to the foam formed by ejection and ignited, and to provide a foaming aerosol product, and a method for suppressing combustibility.SOLUTION: Provided is a foaming aerosol composition that comprises a stock solution containing a foam-curing component and water, and a liquefied gas, and in which the total contained amount of combustible components contained in the stock solution and liquefied gas is by 5 to 30 mass% in the foaming aerosol composition, and the hardness of foam formed when ejected to the outside is 100 to 2000 mN (20°C).SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a foaming aerosol composition and a foaming aerosol product. More specifically, the present invention relates to a foaming aerosol composition, a foaming aerosol product, and a method for suppressing flammability, which can suppress the flammability when a naked fire is brought close to and ignited on the foam formed by ejection.

Background Art

[0002] Conventionally, a foaming aerosol composition that is ejected in a foamed state has been developed (for example, Patent Document 1). Since the foaming aerosol composition has excellent foaming properties, liquefied petroleum gas has been used as an aerosol. Liquefied petroleum gas is a flammable liquefied gas. Therefore, the foam formed by being ejected to the outside catches fire when a naked fire is brought close. If the ignited foam has a long combustion time or generates a high fire column, it is likely to spread to the surroundings. In recent years, in order to improve the safety during storage and transportation, an aerosol composition with low flammability has been demanded.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the invention described in Patent Document 1, by adjusting the foam to a specific hardness, the foam can be formed into a predetermined shape (a rose flower) on an ejection target such as the palm of the hand. However, there is room for improvement in terms of suppressing the flammability of the foam in the foaming aerosol product described in Patent Document 1.

[0005] This invention has been made in view of the above-mentioned conventional problems, and aims to provide a foaming aerosol composition, a foaming aerosol product, and a method for suppressing flammability that can suppress flammability when an open flame is brought close to the foam formed by discharge and ignited. [Means for solving the problem]

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

[0007] (1) An effervescent aerosol composition comprising a stock solution containing a foam-curing component and water, and a liquefied gas, wherein the total content of flammable components in the stock solution and the liquefied gas is 5 to 30% by mass in the effervescent aerosol composition, and the hardness of the foam formed when discharged to the outside is 100 to 2000 mN (20°C).

[0008] With this configuration, the hardness of the foam that is discharged and formed is adjusted to fall within a specific range. As a result, even when an open flame is brought close and the foam is ignited, the diffusion of vaporized flammable components from within the foam is suppressed, and the flammability (burning time and height of the flame column) is suppressed.

[0009] (2) The foaming aerosol composition according to (1), wherein the foam curing component is at least one selected from the group consisting of fatty acid soap, amino acid soap, higher alcohol and water-soluble polymer.

[0010] With this configuration, the foaming aerosol composition makes it easier to adjust the hardness of the foam formed by dispensing, and it is easier to obtain an effect that suppresses flammability.

[0011] (3) The foaming aerosol composition according to (1) or (2), wherein the liquefied gas includes a flammable liquefied gas, and the content of the flammable liquefied gas is 3 to 30% by mass in the foaming aerosol composition.

[0012] With this configuration, the foaming aerosol composition exhibits excellent foaming properties, easily forms bubbles of a specific hardness, and readily provides a combustion suppression effect.

[0013] (4) The foaming aerosol composition according to any one of (1) to (3), wherein the stock solution contains a monohydric alcohol having 2 to 3 carbon atoms, and the alcohol content is 0.1 to 20% by mass in the foaming aerosol composition.

[0014] With this configuration, the foaming aerosol composition is more likely to exhibit an effect of suppressing flammability.

[0015] (5) An effervescent aerosol product comprising the effervescent aerosol composition described in any of (1) to (4).

[0016] With this configuration, the hardness of the foam that is discharged and formed is adjusted to fall within a specific range. As a result, even when an open flame is brought close and the foam is ignited, the diffusion of vaporized flammable components from within the foam is suppressed, and the flammability (burning time and height of the flame column) is suppressed.

[0017] (6) A method for suppressing the flammability of an ejected product, wherein an aerosol composition is ejected to the outside to form an ejected product, the aerosol composition consists of a stock solution containing a foam-curing component and water, and a liquefied gas, the total content of flammable components contained in the stock solution and the liquefied gas is 5 to 30% by mass in the foaming aerosol composition, and the hardness of the foam formed when ejected to the outside is adjusted to 100 to 2000 mN (20°C), a method for suppressing flammability.

[0018] With this configuration, the hardness of the foam that is discharged and formed is adjusted to fall within a specific range. As a result, even when an open flame is brought close and the foam is ignited, the diffusion of vaporized flammable components from within the foam is suppressed, and the flammability (burning time and height of the flame column) is suppressed. [Effects of the Invention]

[0019] According to the present invention, it is possible to provide a foaming aerosol composition, a foaming aerosol product, and a combustion inhibition method that can suppress the flammability when igniting by bringing an open flame close to the foam formed by discharging.

Mode for Carrying Out the Invention

[0020] <Foaming Aerosol Composition> The foaming aerosol composition (hereinafter also referred to as an aerosol composition) according to an embodiment of the present invention is composed of a stock solution containing a foam curing component and water, and a liquefied gas. The total content of the combustible components contained in the stock solution and the liquefied gas is 5 to 30% by mass in the foaming aerosol composition. The hardness of the foam formed when discharged to the outside is 100 to 2000 mN (20 °C). Each will be described below.

[0021] (Stock Solution) The stock solution contains a foam curing component and water. When the stock solution is discharged to the outside, it is foamed by the vaporization of the liquefied gas, constitutes the liquid film of the foam, and imparts the effect of the active ingredient to an object such as hair or skin.

[0022] ·Foam Curing Component The foam curing component is used to adjust the hardness of the foam formed when the aerosol composition is discharged, suppress the diffusion of the vaporized gas of the combustible component from the inside of the foam when the foam is ignited, and obtain a combustion inhibition effect.

[0023] The foam curing component is not particularly limited. For example, it is preferable that the foam curing component is at least one selected from the group consisting of fatty acid soap, amino acid soap, higher alcohol, and water-soluble polymer. By including these in the foam curing component, the aerosol composition can easily adjust the hardness of the foam formed by discharging and can easily obtain the effect of suppressing flammability.

[0024] The fatty acid soap is not particularly limited. For example, the fatty acid soap is a saponified product of a fatty acid having 10 to 20 carbon atoms such as lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, isostearic acid, linoleic acid, linolenic acid, etc., and an organic alkali such as triethanolamine, diethanolamine, monoethanolamine, diisopropanolamine, 2-amino-2-methyl-1-propanol (AMP), 2-amino-2-methyl-1,3-propanediol (AMPD), etc., and an inorganic alkali such as potassium hydroxide, sodium hydroxide, ammonium hydroxide, etc.

[0025] When the fatty acid soap is blended, the content of the fatty acid soap is not particularly limited. For example, the content of the fatty acid soap is preferably 0.1% by mass or more, more preferably 0.5% by mass or more in the aerosol composition. Also, the content of the fatty acid soap is preferably 20% by mass or less, more preferably 15% by mass or less in the aerosol composition. When the content of the fatty acid soap is within the above range, the aerosol composition can easily adjust the hardness of the foam and can easily obtain a combustion inhibition effect.

[0026] The amino acid soap is not particularly limited. For example, the amino acid soap is N-acylglutamate salts such as N-coconut oil fatty acid acyl-L-glutamic acid triethanolamine, N-coconut oil fatty acid acyl-L-glutamic acid potassium, N-coconut oil fatty acid acyl-L-glutamic acid sodium, N-lauroyl-L-glutamic acid triethanolamine, N-lauroyl-L-glutamic acid potassium, N-lauroyl-L-glutamic acid sodium, N-myristoyl-L-glutamic acid potassium, N-myristoyl-L-glutamic acid sodium and N-stearoyl-L-glutamic acid sodium; N-acylglycine salts such as N-coconut oil fatty acid acylglycine potassium and N-coconut oil fatty acid acylglycine sodium; N-acylalanine salts such as N-coconut oil fatty acid acyl-DL-alanine triethanolamine, etc.

[0027] When amino acid soap is incorporated, the amount of amino acid soap it contains is not particularly limited. For example, the amount of amino acid soap in the aerosol composition is preferably 0.1% by mass or more, and more preferably 0.3% by mass or more. Furthermore, the amount of amino acid soap in the aerosol composition is preferably 10% by mass or less, and more preferably 5% by mass or less. By having the amount of amino acid soap within the above range, it is easier to adjust the hardness of the foam and easier to obtain a flammability suppression effect.

[0028] Higher alcohols are not particularly limited. For example, higher alcohols include lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, lanolin alcohol, hexyldodecanol, cetostearyl alcohol, octyldodecanol, etc.

[0029] When higher alcohols are incorporated, the amount of higher alcohols is not particularly limited. For example, the amount of higher alcohols in the aerosol composition is preferably 0.1% by mass or more, and more preferably 0.3% by mass or more. Furthermore, the amount of higher alcohols in the aerosol composition is preferably 10% by mass or less, and more preferably 8% by mass or less. Having the amount of higher alcohols within the above range makes it easier to adjust the hardness of the foam and to obtain a flammability suppression effect.

[0030] Water-soluble polymers are not particularly limited. For example, water-soluble polymers include (PEG-240 / decyltetradeceth-20 / HDI) copolymer, cellulose nanofibers, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, sodium carboxymethylcellulose and other cellulosic polymers, gums such as xanthan gum, carrageenan, gum arabic, tragacanth gum, cationized guar gum, guar gum, and gellan gum, polyurethanes, dextran, sodium carboxymethyldextran, dextrin, pectin, sodium alginate, sodium hyaluronate, polyvinyl alcohol, and carboxyvinyl polymers.

[0031] When a water-soluble polymer is incorporated, the content of the water-soluble polymer is not particularly limited. For example, the content of the water-soluble polymer is preferably 0.01% by mass or more, and more preferably 0.05% by mass or more, in the aerosol composition. Furthermore, the content of the water-soluble polymer is preferably 5% by mass or less, and more preferably 3% by mass or less, in the aerosol composition. When the content of the water-soluble polymer is within the above range, it is easier to adjust the hardness of the foam and easier to obtain a flammability suppression effect.

[0032] ·water Water is used as a solvent for foam-hardening components and active ingredients. The inclusion of water makes it easier for aerosol compositions to form foam with a specific hardness and reduces the flammability of the foam.

[0033] The type of water is not particularly limited. For example, the water could be purified water, deionized water, physiological saline, or deep-sea water.

[0034] The water content is not particularly limited. For example, the water content in the aerosol composition is preferably 50% by mass or more, and more preferably 60% by mass or more. Furthermore, the water content is preferably 95% by mass or less, and more preferably 93% by mass or less. By having a water content within the above range, the aerosol composition can easily form foam with a specific hardness and the flammability of the foam can be reduced.

[0035] ·Optional ingredients The stock solution may contain, in addition to foam curing agent and water, various active ingredients, surfactants, monohydric alcohols, polyhydric alcohols, oils, highly volatile solvents, powders, and other optional components.

[0036] The active ingredient can be appropriately selected depending on the use and purpose of the aerosol composition. For example, the active ingredients include various fragrances such as natural and synthetic fragrances; amphoteric resins such as dialkylaminoethyl (meth)acrylate / (meth)acrylate alkyl ester copolymer, vinyl acetate / crotonic acid copolymer, N-methacryloyloxyethyl N,N-dimethylammonium-α-N-methylcarboxybetaine / methacrylate alkyl ester copolymer, octyl acrylate / hydroxypropyl acrylate / butylaminoethyl methacrylate copolymer; acrylic acid alkanolamine, alkyl acrylate copolymer, alkyl acrylate copolymer emulsion, acrylic acid / acrylamide / ethyl acrylate copolymer, alkyl acrylate / methacrylic acid / silicone copolymer, octyl acrylate / acrylic acid ester copolymer, vinyl acetate / crotonic acid copolymer, crotonic acid / vinyl acetate / vinyl neodecanoate copolymer, anionic resins such as polyurethane; polyvinylpyrrolidone / N,N-dimethylaminoethyl methacrylate copolymer diethyl sulfate (polyquaternium-11); polyvinylpyrrolidone / N,N-dimethyl Aminoethyl methacrylate copolymer dimethyl sulfate, polyvinylpyrrolidone-N,N-dimethylaminoethyl methacrylate copolymer hydrochloride, dimethyldiallylammonium chloride-acrylamide copolymer (polyquaternium-7), -o-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethylcellulose chloride (polyquaternium-10), -o-[2-hydroxy-3-(lauryldimethylammonio)propyl]hydroxyethylcellulose chloride (polyquaternium-24), hydroxyethylcellulose Hair styling agents such as cationic resins including dimethylallylammonium chloride (polyquaternium-4), cooling agents such as l-menthol, camphor, and peppermint oil, vitamins such as retinol, retinyl acetate, retinyl palmitate, calcium pantothenate, magnesium ascorbate phosphate, sodium ascorbate, dl-α-tocopherol, tocopherol acetate, tocopherol, tocopherol nicotinate, dibenzoylthiamine, riboflavin and mixtures thereof, ascorbic acid, α-tocopherol,Antioxidants such as dibutylhydroxytoluene and butylhydroxyanisole; amino acids such as glycine, alanine, leucine, serine, tryptophan, cysteine, methionine, aspartic acid, glutamic acid, and arginine; humectants such as collagen, hyaluronic acid, carotenoid acid, sodium lactate, dl-pyrrolidone carboxylate, keratin, casein, lecithin, and urea; preservatives such as parahydroxybenzoic acid esters, sodium benzoate, potassium sorbate, and phenoxyethanol; disinfectants such as benzalkonium chloride, benzethonium chloride, chlorhexidine chloride, and parachlormethacresol; extracts such as royal jelly extract, 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; zinc oxide, allantoin hydroxyaluminum, tannic acid, and citric acid. These include astringents such as acids and lactic acid, anti-inflammatory agents such as allantoin, glycyrrhetinic acid, dipotassium glycyrrhizate, and azulene, deodorants such as methacrylate lauryl acid, methyl benzoate, methyl phenylacetate, geranyl chloride, acetophenone myristate, benzyl acetate, benzyl propionate, and green tea extract, UV absorbers such as diethylamino hydroxybenzoyl hexyl benzoate, 2-ethylhexyl paramethoxycinnamate, ethylhexyl triazone, oxybenzone, hydroxybenzophenone sulfonic acid, sodium dihydroxybenzophenone sulfonate, and dihydroxybenzophenone, UV scattering agents such as zinc oxide, titanium dioxide, and octyltrimethoxysilane-coated titanium dioxide, whitening agents such as arbutin and kojic acid, antiperspirants such as chlorohydroxyaluminum and isopropylmethylphenol, and anti-inflammatory and analgesic agents such as methyl salicylate, indomethacin, felbinac, and ketoprofen.

[0037] When an active ingredient is included, the amount of the active ingredient is not particularly limited. For example, the amount of the active ingredient in the aerosol composition is preferably 0.1% by mass or more, and more preferably 0.3% by mass or more. Furthermore, the amount of the active ingredient in the aerosol composition is preferably 20% by mass or less, and more preferably 15% by mass or less. By keeping the amount of the active ingredient within the above range, the effects of including the active ingredient are more easily obtained.

[0038] Surfactants are suitably added to aerosol compositions for purposes such as adjusting the foaming properties, foam hardness, and foam retention.

[0039] The surfactant is not particularly limited. For example, surfactants include nonionic surfactants such as cocamide DEA, polyoxyethylene alkyl ether, polyglycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene polyoxypropylene alkyl ether, polyethylene glycol fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether fatty acid ester, polyoxyethylene sorbitan fatty acid ester, and polyoxyethylene sorbitan fatty acid ester; anionic surfactants other than fatty acid soaps such as alkyl sulfate, polyoxyethylene alkyl ether sulfate, alkyl phosphate, and polyoxyethylene alkyl ether phosphate; cationic surfactants such as alkylammonium salt and polyoxyethylene alkylamine; amphoteric surfactants such as alkyl betaine and fatty acid amidopropyl betaine; and silicone-based surfactants. Note that these surfactants are not included in the flammable components in this embodiment.

[0040] When a surfactant is included, the amount of surfactant is not particularly limited. For example, the amount of surfactant in the aerosol composition is preferably 0.1% by mass or more, and more preferably 0.3% by mass or more. Furthermore, the amount of surfactant in the aerosol composition is preferably 10% by mass or less, and more preferably 8% by mass or less. When the amount of surfactant is within the above range, the effects of including the surfactant are more easily obtained.

[0041] Alcohol is suitably incorporated as a solvent for dissolving active ingredients that are insoluble in water.

[0042] The alcohol is not particularly limited. For example, the alcohol is preferably a monohydric alcohol with 2 to 3 carbon atoms, such as ethanol or isopropanol. In this embodiment, these alcohols are included in the flammable component.

[0043] When alcohol is included, the alcohol content is not particularly limited. For example, the alcohol content is preferably 0.1% by mass or more, and more preferably 1% by mass or more, in the aerosol composition. Furthermore, the alcohol content is preferably 20% by mass or less, and more preferably 15% by mass or less, in the aerosol composition. When the alcohol content is within the above range, the aerosol composition can easily incorporate active ingredients while obtaining a flammability suppression effect due to the hardness of the foam. If the alcohol content exceeds 20% by mass in the aerosol composition, the foam does not harden easily, and the flammability suppression effect is difficult to obtain.

[0044] Polyhydric alcohols are suitably added to aerosol compositions for purposes such as adjusting their effervescence and drying properties.

[0045] Polyhydric alcohols are not particularly limited. Examples include propylene glycol, 1,3-butylene glycol, hexylene glycol, dipropylene glycol, glycerin, and diglycerin.

[0046] When polyhydric alcohols are included, the polyhydric alcohol content is not particularly limited. For example, the polyhydric alcohol content is preferably 0.1% by mass or more, and more preferably 0.5% by mass or more, in the aerosol composition. Furthermore, the polyhydric alcohol content is preferably 20% by mass or less, and more preferably 15% by mass or less, in the aerosol composition. By having the polyhydric alcohol content within the above range, the foaming and drying properties of the aerosol composition can be easily adjusted.

[0047] Oils are suitably added to aerosol compositions for purposes such as adjusting the foaming properties and foam hardness, and removing oily stains.

[0048] The oils are not particularly limited. For example, oils include ester oils such as isopropyl myristate, isopropyl palmitate, diisopropyl adipate, caprylic / capric triglyceride, diethoxyethyl succinate, methylpentanediol dieopentanoate, and neopentyl glycol dicaprate; hydrocarbon oils such as liquid paraffin, kerosene, squalene, squalane, and isoparaffin; 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; and silicone oils such as methylpolysiloxane, methylphenylpolysiloxane, and methylpolycyclosiloxane. These oils are included in the flammable components in this embodiment.

[0049] When an oil is incorporated, the oil content is not particularly limited. For example, the oil content is preferably 0.1% by mass or more, and more preferably 0.3% by mass or more, in the aerosol composition. Furthermore, the oil content is preferably 10% by mass or less, and more preferably 8% by mass or less, in the aerosol composition. By keeping the oil content within the above range, the effects of incorporating the oil are more easily obtained.

[0050] Highly volatile solvents are suitably used for purposes such as adjusting the foaming properties of aerosol compositions.

[0051] The highly volatile solvent is not particularly limited. For example, highly volatile solvents include hydrofluoroolefins with boiling points of 10 to 40°C, such as trans-1-chloro-3,3,3-trifluoropropene (HFO-1233zd(E), boiling point 19°C), cis-1-chloro-3,3,3-trifluoropropene (HFO-1233zd(Z), boiling point 39°C), and cis-1-chloro-2,3,3,3-tetrafluoroolefin (HFO-1224yd(Z), boiling point 15°C). These highly volatile solvents are non-flammable solvents and are not included in the flammable components of this embodiment.

[0052] When a highly volatile solvent is incorporated, the amount of the highly volatile solvent is not particularly limited. For example, the amount of the highly volatile solvent in the aerosol composition is preferably 0.1% by mass or more, and more preferably 1% by mass or more. Furthermore, the amount of the highly volatile solvent in the aerosol composition is preferably 20% by mass or less, and more preferably 15% by mass or less. By having the amount of the highly volatile solvent within the above range, the foaming properties of the aerosol composition can be easily adjusted.

[0053] Powder is preferably used for purposes such as improving the user experience.

[0054] The powder is not particularly limited. For example, powders include talc, silica, zeolite, kaolin, mica, magnesium carbonate, calcium carbonate, zinc silicate, magnesium silicate, aluminum silicate, calcium silicate, etc.

[0055] When powder is incorporated, the powder content is not particularly limited. For example, the powder content is preferably 0.1% by mass or more, and more preferably 0.3% by mass or more, in the aerosol composition. Furthermore, the powder content is preferably 5% by mass or less, and more preferably 3% by mass or less, in the aerosol composition. By keeping the powder content within the above range, the effects of incorporating powder are more easily obtained.

[0056] 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 a foam-curing component and optional components such as an active ingredient, surfactant, and alcohol to water or warm water.

[0057] The content of the undiluted 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 undiluted solution is preferably 97% by mass or less, and more preferably 95% by mass or less, in the aerosol composition. When the content of the undiluted solution is within the above range, the aerosol composition has excellent foam quality, easily forms foam of a predetermined hardness, and easily provides a flammability suppression effect.

[0058] (Liquefied gas) The liquefied gas remains in a liquefied state inside the aerosol container. When discharged to the outside, it vaporizes, increasing in volume and causing the undiluted liquid to foam, forming bubbles.

[0059] The liquefied gas is not particularly limited. For example, the liquefied gas is preferably a flammable liquefied gas because it produces fine-textured, excellent foam and easily forms foam of a predetermined hardness, and more preferably liquefied petroleum gas, dimethyl ether, or mixtures thereof.

[0060] The content of flammable liquefied gas is preferably 3% by mass or more, and more preferably 5% by mass or more, in the aerosol composition. Furthermore, the content of flammable liquefied gas is preferably 30% by mass or less, and more preferably 25% by mass or less, in the aerosol composition. When the content of flammable liquefied gas is within the above range, the aerosol composition has excellent foam quality, easily forms foam of a predetermined hardness, and easily provides a flammability suppression effect.

[0061] Furthermore, within limits that do not reduce the foam quality or foam hardness, 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), may be mixed with the flammable liquefied gas.

[0062] Furthermore, the effervescent 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.

[0063] 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 0.7 MPa or lower, and more preferably 0.65 MPa or lower. By filling the compressed gas to a pressure within the above range, stable discharge is possible even at low temperatures.

[0064] In this embodiment, the aerosol composition may contain a total amount of flammable components in the undiluted liquid and liquefied gas of 5% by mass or more, preferably 7% by mass or more. Furthermore, the total amount of flammable components may be 30% by mass or less, preferably 25% by mass or less. If the total amount of flammable components is less than 5% by mass, the aerosol composition will have poor foaming properties. On the other hand, if the total amount of flammable components exceeds 30% by mass, the aerosol composition will continue to burn or produce a high flame when an open flame is brought near the foam formed by the discharge.

[0065] Furthermore, the hardness of the foam formed when the aerosol composition of this embodiment is dispensed to the outside may be 100 mN (20°C) or higher, and preferably 105 mN (20°C) or higher. Also, the hardness of the foam may be 2000 mN (20°C) or lower, and preferably 1000 mN (20°C) or lower. If the hardness of the foam is less than 100 mN (20°C), the aerosol composition cannot suppress the diffusion of vaporized gas of the flammable component within the foam, and the flammable component is likely to leak out of the foam. As a result, the foam is likely to burn for a long time or produce a large flame. On the other hand, if the hardness of the foam exceeds 2000 mN (20°C), the usability tends to deteriorate, such as becoming difficult to spread.

[0066] <Effervescent aerosol products and methods for suppressing flammability> An effervescent aerosol product (hereinafter also referred to as the aerosol product) according to one embodiment of the present invention contains the effervescent aerosol composition described above. The aerosol product of this embodiment can be prepared by filling it with the aerosol composition. Specifically, the aerosol composition can be prepared by filling the container body with the stock solution, attaching the valve, filling it with liquefied gas through the valve, and mixing the stock solution and the liquefied gas, as can an aerosol product filled with the aerosol composition.

[0067] 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.

[0068] 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.

[0069] A valve is a component used to close and seal the opening of a container body. The valve primarily comprises a housing held in a mounting cup fitted to the opening of the container body, a stem with a stem hole connecting the inside and outside of the container body, and a stem rubber attached around the stem hole to close it. The housing contains the stem, the stem rubber, and a spring that biases the stem upward. A spray member for spraying the aerosol composition is attached to the upper end of the stem.

[0070] 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.

[0071] 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 flex downward, opening the stem hole. As a result, the inside and outside of the container body are connected. Once the inside and outside of the container body are connected, the pressure difference between the inside and outside of the container body draws the aerosol composition into the housing, which then passes through the stem hole and the internal stem passage to the spraying member, and is subsequently sprayed from the spray hole. The discharged aerosol composition foams on the target surface (e.g., an arm) and forms a foam.

[0072] Furthermore, using the aerosol product of this embodiment suppresses the flammability of the discharged material. That is, the flammability suppression method of one embodiment of the present invention is a flammability suppression method for suppressing the flammability of a discharged material. The flammability suppression method involves discharging an aerosol composition to the outside to form a discharged material. The aerosol composition consists of a stock solution containing a foam-curing component and water, and a liquefied gas. The total content of flammable components in the stock solution and liquefied gas is 5 to 30% by mass in the foaming aerosol composition. The hardness of the foam formed when discharged to the outside is adjusted to 100 to 2000 mN (20°C). With this flammability suppression method, compared to using conventional aerosol compositions other than the aerosol composition of the above embodiment, even if an open flame is brought close and ignited, the diffusion of vaporized gas of flammable components from inside the foam is suppressed, and the flammability (burning time and height of the flame column) is suppressed. [Examples]

[0073] 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.

[0074] (Example 1) Concentrate 1 was prepared according to the formulation shown in Table 1 below, and 90 g (90% by mass) was filled into an aluminum container. A valve was attached to the opening of the container, and 10 g (10% by mass) of liquefied petroleum gas was filled through the valve. Concentrate 1 and liquefied petroleum gas were mixed in the aerosol container to prepare a foaming aerosol composition.

[0075] [Table 1]

[0076] (Example 2, Comparative Examples 1-4) The formulation of the stock solution was changed to the formulation shown in Table 1, and stock solutions 2, 4-7 were prepared. Using each of the obtained stock solutions 2, 4-7, Example 2 and Comparative Examples 1-4 were prepared in the same manner as in Example 1.

[0077] The aerosol compositions obtained in Examples 1-2 and Comparative Examples 1-4 were evaluated for foam hardness and foam flammability (flame height and burning time) using the following evaluation methods. The results are shown in Table 2.

[0078] <Foam hardness> The aerosol product was immersed in a 20°C constant temperature water bath for one hour to adjust the aerosol composition to 20°C. The aerosol was then dispensed into a bottomed cylindrical cup (32 mm inner diameter, 27 mm depth) to fill the cup with foam, and the opening of the cup was leveled with a plate to flatten the surface of the foam. The hardness (breaking point) of this foam was measured by applying a load from above with a 30 mm diameter disc-shaped plunger to compress it. EZ-test (manufactured by Shimadzu Corporation) was used to measure hardness and elasticity.

[0079] <Foam Combustion Test> The aerosol product was immersed in a 20°C constant temperature water bath for 1 hour to adjust the aerosol composition to 20°C, and 5g was dispensed onto a watch glass to form foam. An open flame was brought close to the foam, and the height of the flame and the burning time when the foam ignited were measured and evaluated according to the following evaluation criteria. (Evaluation Criteria) ◎: The foam did not ignite. ○: The foam ignited but disappeared within 2 seconds. △: The foam ignited, and the flame height was less than 4 cm. ×: The foam ignited, the flame height was 4 cm or more, and the burning time was 7 seconds or more.

[0080] [Table 2]

[0081] As shown in Table 2, comparing Example 1 and Comparative Example 1, the aerosol composition of Example 1 did not ignite because the foam hardness exceeded 100 mN when a higher alcohol was added, whereas the aerosol composition of Comparative Example 1 had a foam hardness below 100 mN and ignited. Comparing Example 2 and Comparative Example 2, similar to the comparison between Example 1 and Comparative Example 1, the aerosol composition could be made less ignitable by adding a higher alcohol. Comparative Examples 3 and 4 contained more than 30% by mass of flammable components, and even with the addition of a higher alcohol, the foam hardness of the aerosol composition remained below 100 mN, and the flammability could not be suppressed.

[0082] (Example 3) A foaming aerosol composition was prepared in the same manner as in Example 1, except that 85 g (85% by mass) of the stock solution 4 shown in Table 1 and 15 g (15% by mass) of liquefied petroleum gas were filled into the mixture.

[0083] (Comparative Example 5) A foaming aerosol composition was prepared in the same manner as in Example 3, except that stock solution 5 shown in Table 1 was used.

[0084] (Example 4) A foaming aerosol composition was prepared in the same manner as in Example 1, except that 80 g (80% by mass) of stock solution 1 shown in Table 1 and 20 g (20% by mass) of liquefied petroleum gas were filled into the mixture.

[0085] (Comparative Example 6) A foaming aerosol composition was prepared in the same manner as in Example 4, except that stock solution 2 shown in Table 1 was used.

[0086] (Example 5) A foaming aerosol composition was prepared in the same manner as in Example 4, except that stock solution 3 shown in Table 1 was used.

[0087] The aerosol compositions obtained in Examples 3-5 and Comparative Examples 5-6 were evaluated for foam hardness and foam flammability (flame height and burning time) using the evaluation method described above. The results are shown in Table 3.

[0088] [Table 3]

[0089] As shown in Table 3, comparing Example 3 and Comparative Example 5, the aerosol composition of Example 3, with the addition of a higher alcohol, had a foam hardness exceeding 100 mN and ignited, but the burning time was less than 2 seconds. In contrast, the aerosol composition of Comparative Example 5 had a foam hardness below 100 mN, a flame height of 10 cm, and a burning time of 26 seconds. Comparing Example 4 and Comparative Example 6, the aerosol composition of Example 4, with the addition of a higher alcohol, had a foam hardness exceeding 100 mN and did not ignite. In contrast, the aerosol composition of Comparative Example 6 had a foam hardness below 100 mN, a flame height of 15 cm, and a burning time of 10 seconds. Furthermore, the aerosol composition of Example 5, which contained ethanol in addition to the aerosol composition of Example 4, had a foam hardness exceeding 100 mN and ignited, but the burning time was less than 2 seconds.

[0090] (Example 6) A foaming aerosol composition was prepared in the same manner as in Example 1, except that 95 g (95% by mass) of the stock solution 8 shown in Table 4 and 5 g (5% by mass) of liquefied petroleum gas were filled into the mixture.

[0091] (Comparative Example 7) A foaming aerosol composition was prepared in the same manner as in Example 6, except that stock solution 9 shown in Table 5 was used.

[0092] [Table 4]

[0093] [Table 5]

[0094] (Example 7) A foaming aerosol composition was prepared in the same manner as in Example 1, except that 80 g (80% by mass) of the stock solution 10 shown in Table 6 and 20 g (20% by mass) of liquefied petroleum gas were filled into the mixture.

[0095] (Comparative Example 8) A foaming aerosol composition was prepared in the same manner as in Example 7, except that the stock solution 11 shown in Table 6 was used.

[0096] [Table 6]

[0097] The aerosol compositions obtained in Examples 6-7 and Comparative Examples 7-8 were evaluated for foam hardness and foam flammability (flame height and burning time) using the evaluation method described above. The results are shown in Table 7.

[0098] [Table 7]

[0099] As shown in Table 7, comparing Example 6 with Comparative Example 7, the aerosol composition of Example 6, by adding amino acid soap, had a foam hardness exceeding 100 mN, a flame height of 3 cm, and a burning time of 10 seconds, while the aerosol composition of Comparative Example 7 had a foam hardness below 100 mN, a flame height of 3 cm, and a burning time of 18 seconds. Comparing Example 7 with Comparative Example 8, the aerosol composition of Example 7, by adding fatty acid soap, had a foam hardness exceeding 100 mN, a flame height of 13 cm, and a burning time of 2 seconds or less, while the aerosol composition of Comparative Example 8 had a foam hardness below 100 mN, a flame height of 20 cm, and a burning time of 12 seconds.

[0100] (Example 8) A foaming aerosol composition was prepared in the same manner as in Example 1, except that 80 g (80% by mass) of the stock solution 12 shown in Table 8 and 20 g (20% by mass) of liquefied petroleum gas were filled into the mixture.

[0101] [Table 8]

[0102] The aerosol compositions obtained in Example 8 were evaluated for foam hardness and foam flammability (flame height and burning time) using the evaluation method described above. The results are shown in Table 9.

[0103] [Table 9]

[0104] As shown in Table 9, when comparing Example 8 with Comparative Example 6, which had the same amount of flammable components but no foam-curing components, the aerosol composition of Example 8, due to the inclusion of a water-soluble polymer, had a foam hardness exceeding 100 mN, a flame height of 18 cm, and a burning time of less than 2 seconds, while the aerosol composition of Comparative Example 6 had a foam hardness below 100 mN, a flame height of 15 cm, and a burning time of 10 seconds.

Claims

1. It consists of a stock solution containing foam-curing components and water, and a liquefied gas. The total content of flammable components in the undiluted liquid and the liquefied gas is 5 to 30% by mass in the effervescent aerosol composition. The content of the aforementioned stock solution is 70 to 97% by mass in the aerosol composition. The aforementioned stock solution contains a monohydric alcohol with 2 to 3 carbon atoms. The alcohol content is 0.1 to 20% by mass in the effervescent aerosol composition. The hardness of the foam formed when discharged to the outside is 100 to 2000 mN (at 20°C). The water content of the foaming aerosol composition is 50 to 95% by mass.

2. The foaming aerosol composition according to claim 1, wherein the foam-curing component is at least one selected from the group consisting of fatty acid soaps, amino acid soaps, higher alcohols, and water-soluble polymers.

3. The liquefied gas includes a flammable liquefied gas. The foaming aerosol composition according to claim 1 or 2, wherein the content of the flammable liquefied gas is 3 to 30% by mass in the foaming aerosol composition.

4. A foaming aerosol product comprising the foaming aerosol composition according to any one of claims 1 to 3.

5. This is a method for suppressing the flammability of discharged material. The aerosol composition is dispensed to the outside to form a discharge, The aerosol composition is It consists of a stock solution containing foam-curing components and water, and a liquefied gas. The total content of flammable components in the undiluted liquid and the liquefied gas is 5 to 30% by mass in the effervescent aerosol composition. The content of the aforementioned stock solution is 70 to 97% by mass in the aerosol composition. The aforementioned stock solution contains a monohydric alcohol with 2 to 3 carbon atoms. The alcohol content is 0.1 to 20% by mass in the effervescent aerosol composition. The water content in the effervescent aerosol composition is 50 to 95% by mass. A method for suppressing flammability, wherein the hardness of the foam formed when discharged to the outside is adjusted to 100 to 2000 mN (at 20°C).

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