Foamable aerosol composition, and aerosol product

Abstract

To provide a foamable aerosol composition which is superior in stability, fluidity, and foaming capability, and furthermore superior in detergency and includes carbon dioxide, and also to provide an aerosol product prepared using the composition.SOLUTION: A foamable aerosol composition is provided, including a propellant and a stock solution. The stock solution includes: at least one selected from the group consisting of an alkylamine oxide represented by formula (1-1) and an alkyl betaine represented by formula (1-2); and a salt of a fatty acid and an alkali agent.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present disclosure relates to a foamable aerosol composition and an aerosol product using the foamable aerosol composition. [Background technology]

[0002] Soap is a general term for salts of higher fatty acids, and because of its high emulsifying, foaming, and cleaning power, it is widely used in medicines, cosmetics, industrial products, etc. For example, Patent Document 1 discloses an oil-in-water emulsion composition containing a higher fatty acid salt, α-monoglycerin ether, and a nonionic surfactant.

[0003] When soap is aerosolized, it can form a resilient, creamy foam, which can be used in body washes, shaving products, etc. For example, Patent Document 2 discloses an aerosol shaving foam composition containing a compressed gas as a propellant and a low-temperature stabilizer such as ethanol. Patent Document 3 discloses an aerosol composition containing a fatty acid, an alkaline agent, a liquefied gas, and a compressed gas. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 56-154408 [Patent Document 2] Japanese Patent Publication No. 61-251612 [Patent Document 3] JP 2003-252725 A Summary of the Invention [Problem to be solved by the invention]

[0005] Carbon dioxide gas is known to impart blood circulation promoting effects and cleaning power improving effects to formulations, and the use of carbon dioxide gas in aerosolization makes it easier for consumers to benefit from the effects of carbon dioxide gas. However, the use of carbon dioxide gas in an aerosol composition using soap poses the problem of reduced stability, fluidity, and foam forming ability (foaming power and foam smoothness) of the composition.

[0006] In view of such problems, the present disclosure provides a foamable aerosol composition containing carbon dioxide gas, which has excellent stability, fluidity, and foam-forming ability, and further has excellent cleaning power, and an aerosol product using the composition. [Means for solving the problem]

[0007] As a result of investigations aimed at solving the above-mentioned problems, the inventors have found that in a foamable aerosol composition comprising a propellant containing carbon dioxide gas and a concentrate, the above-mentioned problems can be solved by blending at least one selected from the group consisting of alkylamine oxides and alkylbetaines, and a salt of a fatty acid and an alkaline agent with the concentrate, and have completed the present invention.

[0008] That is, the present disclosure includes the following aspects. [1] A foamable aerosol composition comprising a propellant and a concentrate, The stock solution contains at least one selected from the group consisting of an alkylamine oxide represented by general formula (1-1) and an alkylbetaine represented by general formula (1-2), as well as a salt of a fatty acid and an alkaline agent; [ka] [In the general formula (1-1), R 1 represents an alkyl group having 8 to 22 carbon atoms, R 2 and R 3 each independently represents an alkyl group having 1 to 4 carbon atoms or -(AO) m H (A represents an alkylene group having 2 to 4 carbon atoms, and m represents an integer of 1 to 5), Z represents -O- or -CONH-, x represents an integer of 0 to 4, and n represents an integer of 2 to 4. [ka] [In the general formula (1-2), R 4 represents an alkyl group having 7 to 22 carbon atoms. The foamable aerosol composition, wherein the propellant comprises carbon dioxide gas. [2] In the general formula (1-1), R 1 represents an alkyl group having 10 to 20 carbon atoms, and R 2 and R 3 each independently represents an alkyl group having 1 to 2 carbon atoms or -(AO) m H (A represents an alkylene group having 2 to 3 carbon atoms, and m represents an integer of 1 to 2), and x represents 0; In the general formula (1-2), R 4 represents an alkyl group having 7 to 17 carbon atoms. [3] The foamable aerosol composition according to [1] or [2], wherein the fatty acid contains 60 mass% or more of a fatty acid having 10 to 16 carbon atoms. [4] The foamable aerosol composition according to any one of [1] to [3], wherein the alkaline agent comprises at least one selected from the group consisting of triethanolamine, 2-amino-2-methyl-1-propanol, and L-arginine. [5] The foamable aerosol composition according to any one of [1] to [4], wherein the propellant further contains a liquefied gas. [6] An aerosol product in which a foamable aerosol composition is filled in an aerosol container, The foamable aerosol composition according to any one of [1] to [5], wherein the foamable aerosol composition is an aerosol product. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a foamable aerosol composition containing carbon dioxide gas, which has excellent stability, fluidity, and foam-forming ability, and further has excellent cleaning power, and an aerosol product using the composition. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The description of a numerical range such as "XX to YY" or "XX to YY" means a numerical range including the lower and upper limits, unless otherwise specified. When a numerical range is described in stages, the upper and lower limits of each numerical range can be arbitrarily combined.

[0011] [Foamable aerosol composition] A foamable aerosol composition according to one embodiment of the present invention (hereinafter, simply referred to as "foamable aerosol composition") is a foamable aerosol composition comprising a propellant and a concentrate. The concentrate comprises at least one selected from the group consisting of alkylamine oxides represented by general formula (1-1) and alkylbetaines represented by general formula (1-2), as well as a salt of a fatty acid and an alkaline agent, and the propellant comprises carbon dioxide gas. Such a foamable aerosol composition is excellent in stability, fluidity, and foam forming ability, and also has excellent cleaning power. Each component contained in the foamable aerosol composition will be described below.

[0012] <Fatty acid> The concentrate contained in the foamable aerosol composition contains a salt of a fatty acid and an alkaline agent, which is formed by neutralizing a fatty acid with an alkaline agent described below.

[0013] The fatty acid may be, for example, at least one selected from the group consisting of the following: Capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, isostearic acid, behenic acid, oxystearic acid, palmitoleic acid, linoleic acid, linolenic acid, ricinoleic acid, and undecylenic acid.

[0014] The fatty acid is preferably at least one selected from the group consisting of capric acid, lauric acid, myristic acid, and palmitic acid, and more preferably at least one selected from the group consisting of lauric acid, myristic acid, and palmitic acid.

[0015] The fatty acid preferably contains 60.0% by mass or more, more preferably 70.0% by mass or more, even more preferably 80.0% by mass or more, and even more preferably 90.0% by mass or more of fatty acids having 10 to 16 carbon atoms. The fatty acid may contain 100% by mass of fatty acids having 10 to 16 carbon atoms. By containing fatty acids having 10 to 16 carbon atoms in the above range, the stability and flowability of the foamable aerosol composition can be further improved.

[0016] The fatty acid preferably contains a saturated fatty acid. That is, the fatty acid having 10 to 16 carbon atoms is preferably a saturated fatty acid having 10 to 16 carbon atoms. By containing a saturated fatty acid, the foamable aerosol composition is less likely to precipitate even when carbon dioxide gas is blended therein, and the stability of the foamable aerosol composition can be further improved.

[0017] The fatty acid content in the concentrate is preferably 0.50% by mass to 15.00% by mass, more preferably 1.00% by mass to 10.00% by mass, and further preferably 1.50% by mass to 6.00% by mass. By having the fatty acid content within the above range, the stability, fluidity, and foam forming ability of the foamable aerosol composition can be further improved.

[0018] <Alkaline agent> The concentrate contained in the foamable aerosol composition contains a salt of a fatty acid and an alkaline agent. As described above, the salt is a salt formed by neutralizing the fatty acid with an alkaline agent.

[0019] The alkaline agent may be any agent capable of neutralizing fatty acids, and examples of such agents include alkanolamines such as 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, 2-amine-2-ethyl-1,3-propanediol, 2-amino-1-butanol, monoisopropanolamine, diisopropanolamine, triisopropanolamine, monoethanolamine, diethanolamine, and triethanolamine; quaternary amines such as tetrahydroxypropylethylenediamine; and salts of L-arginine. basic amino acids; and at least one selected from the group consisting of inorganic alkaline agents such as potassium hydroxide, ammonia, and sodium hydroxide.

[0020] The alkaline agent preferably contains at least one selected from the group consisting of triethanolamine, 2-amino-2-methyl-1-propanol, and L-arginine. By containing at least one selected from the group consisting of triethanolamine, 2-amino-2-methyl-1-propanol, and L-arginine, the precipitation of soap is easily suppressed, and the stability, fluidity, and foam forming ability of the foamable aerosol composition can be further improved.

[0021] The mass ratio of the alkaline agent content to the fatty acid content in the concentrate is preferably 0.10 to 2.00, more preferably 0.20 to 1.50, and even more preferably 0.30 to 1.20. When the mass ratio of the alkaline agent content to the fatty acid content is within the above range, the stability, fluidity, and foam-forming ability of the foamable aerosol composition can be further improved.

[0022] <At least one selected from the group consisting of alkylamine oxides and alkylbetaines> The concentrate contained in the foamable aerosol composition contains at least one selected from the group consisting of alkylamine oxides represented by general formula (1-1) and alkylbetaines represented by general formula (1-2).

[0023] [ka] [In the general formula (1-1), R 1 represents an alkyl group having 8 to 22 carbon atoms, R 2 and R 3 each independently represents an alkyl group having 1 to 4 carbon atoms or -(AO) mH (A represents an alkylene group having 2 to 4 carbon atoms, and m represents an integer of 1 to 5), Z represents -O- or -CONH-, x represents an integer of 0 to 4, and n represents an integer of 2 to 4.

[0024] [ka] [In the general formula (1-2), R 4 represents an alkyl group having 7 to 22 carbon atoms.

[0025] By including at least one selected from the group consisting of alkylamine oxide represented by general formula (1-1) and alkylbetaine represented by general formula (1-2) in the concentrate in addition to soap, which is a salt of a fatty acid and an alkaline agent, it is possible to prepare a foamable aerosol composition that is excellent in stability, fluidity, and foam forming ability even in the presence of acidic carbon dioxide gas. The present inventors believe that this is because at least one selected from the group consisting of alkyl betaines represented by formula (1-2) and soap form a complex when mixed with carbon dioxide gas.

[0026] R in general formula (1-1) 1 preferably represents an alkyl group having 10 to 20 carbon atoms, and more preferably represents an alkyl group having 12 to 18 carbon atoms.

[0027] R in general formula (1-1) 2 and R 3 are each independently preferably an alkyl group having 1 to 2 carbon atoms or -(AO) m H (A represents an alkylene group having 2 to 3 carbon atoms, and m represents an integer of 1 to 2) is more preferable, and it represents a methyl group or -C2H4-OH. In the general formula (1-1), x preferably represents 0.

[0028] R in general formula (1-2) 4represents preferably an alkyl group having 7 to 17 carbon atoms, more preferably an alkyl group having 9 to 13 carbon atoms, and further preferably an alkyl group having 11 carbon atoms.

[0029] The alkylamine oxide represented by the general formula (1-1) may be, for example, at least one selected from the group consisting of the following: Lauramine oxide, stearamine oxide, dihydroxyethyl lauramine oxide, polyoxyethylene cocoalkyl dimethylamine oxide, and lauramidopropylamine oxide.

[0030] The alkylamine oxide represented by the general formula (1-1) is preferably at least one selected from the group consisting of lauramine oxide, stearamine oxide, and dihydroxyethyl lauramine oxide.

[0031] The alkyl betaine represented by the general formula (1-2) may be, for example, at least one selected from the group consisting of the following: Lauramidopropyl betaine, and cocamidopropyl betaine. The alkyl betaine represented by the general formula (1-2) is preferably lauramidopropyl betaine.

[0032] The total content of the alkylamine oxide represented by the general formula (1-1) and the alkylbetaine represented by the general formula (1-2) in the concentrate is preferably 0.10 to 10.00% by mass, more preferably 0.30 to 8.00% by mass, and even more preferably 0.50 to 6.00% by mass. By having the total content of the alkylamine oxide represented by the general formula (1-1) and the alkylbetaine represented by the general formula (1-2) within the above range, the stability, fluidity, and foam forming ability of the foamable aerosol composition can be further improved.

[0033] The mass ratio of the total content of the alkylamine oxide represented by formula (1-1) and the alkylbetaine represented by formula (1-2) to the content of the fatty acid in the concentrate is preferably 0.1 to 10.0, more preferably 0.3 to 8.0, and even more preferably 0.5 to 6.0. By having the mass ratio of the total content of the alkylamine oxide represented by formula (1-1) and the alkylbetaine represented by formula (1-2) to the content of the fatty acid within the above range, the stability, fluidity, and foam forming ability of the foamable aerosol composition can be further improved.

[0034] <Oily ingredients> The concentrate contained in the foamable aerosol composition may contain an oily component other than fatty acids. The oil component is not particularly limited, and a wide variety of known water-insoluble (phase-separated from water) oil components can be used. In this specification, "water-insoluble" refers to a solubility of 1.0 g or less in 100 g of water at 25°C, for example.

[0035] The oil component may be, for example, at least one selected from the group consisting of the following: vegetable fats such as apricot kernel oil, camellia oil, argan oil, soybean oil, olive oil, castor oil, coconut oil, palm oil, palm kernel oil, sesame oil, jojoba oil, cottonseed oil, rapeseed oil, linseed oil, rosehip oil, sunflower oil, essential oils, avocado oil, almond oil, rice bran oil, safflower oil, corn oil, grapeseed oil, coconut oil, Argania spinosa kernel oil, wheat germ oil, rice germ oil, kukui nut oil, crambe abyssinica seed oil, hemp seed oil, peanut oil, camellia oil, evening primrose oil, pistachio oil, macadamia nut oil, meadowhoo oil, cocoa butter, shea butter, and japan wax; Animal fats and oils, such as emu oil, horse fat, beef tallow, lard, mutton tallow, mink oil, egg yolk fat, carp fat, tuna fat, and menhaden fat; Hydrocarbon oils such as light isoparaffin, squalane, liquid paraffin, petrolatum, dodecane, tetradecane, ozokerite, microcrystalline wax, isoparaffin, ceresin, α-olefin oligomer, polybutene, hydrogenated polyisoparaffin, limonene, and turpentine; Higher alcohols such as caproyl alcohol, caprylyl alcohol, capryl alcohol, lauryl alcohol, isostearyl alcohol, myristyl alcohol, cetanol, stearyl alcohol, arachyl alcohol, behenyl alcohol, oleyl alcohol, hexyldecanol, octyldodecanol, decyltetradecanol, cholesterol, and phytosterols; Esters of straight-chain fatty acids and lower alcohols, such as isopropyl myristate, isopropyl palmitate, and ethyl oleate; Esters of straight-chain fatty acids and straight-chain higher alcohols, such as hexyl laurate, myristyl myristate, decyl oleate, and stearyl stearate; Esters of straight-chain fatty acids with branched alcohols, such as octyldodecyl myristate, isostearyl palmitate, and ethylhexyl stearate; Esters of branched fatty acids and lower alcohols, such as ethyl isostearate and isopropyl isostearate; Esters of branched fatty acids and linear higher alcohols, such as cetyl ethylhexanoate and hexyl isostearate; Esters of fatty acids and polyhydric alcohols, such as PG dicaprylate, triethylhexanoin, and tri(caprylcapric acid)glyceryl; Esters of branched fatty acids and branched alcohols, such as 2-octyldodecyl neopentanoate and isostearyl isostearate; Esters of hydroxycarboxylic acids and alcohols, such as lauryl lactate, tri-2-ethylhexyl citrate, trioctyldodecyl citrate, and diisostearyl malate; ester oils such as esters of dibasic acids, such as diisopropyl adipate, diethyl sebacate, etc.; Wax esters such as jojoba oil, jojoba butter, carnauba wax, candelilla wax, rice bran wax, shellac, lanolin, beeswax, montan wax, spermaceti, orange roughy oil, sugar cane wax, palm wax, insect wax, and wool wax; Ethers of polyhydric and monohydric alcohols, such as chimyl alcohol (glycerol monocetyl ether), batyl alcohol, and selachyl alcohol; Batyl isostearate, batyl stearate; Silicones such as alkyl-modified polysiloxane (dimethylpolysiloxane (dimethicone)), methylphenylpolysiloxane, and fluorine-modified polysiloxane; Oil-based active ingredients such as UV absorbers (diethylaminohydroxybenzoylhexyl benzoate, ethylhexyl methoxycinnamate, octocrylene, t-butyl methoxybenzoylmethane, ethylhexyl salicylate, polysilicone-15), DEET, icaridin, and fragrance.

[0036] From the viewpoints of stability and handling during preparation, the oily component is preferably liquid at 20° C. The content of oily components other than fatty acids in the original solution is preferably 0.05% by mass to 5.00% by mass, more preferably 0.10% by mass to 2.50% by mass, and even more preferably 0.20% by mass to 1.20% by mass.

[0037] <Surfactant> The concentrate contained in the foamable aerosol composition may contain a surfactant other than the alkylamine oxide represented by the general formula (1-1) and the alkylbetaine represented by the general formula (1-2). The surfactant may be any of anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants, and one or more of them may be used.

[0038] The anionic surfactant may be, for example, at least one selected from the group consisting of the following: Fatty acid salts such as potassium coconut oil fatty acid, potassium laurate, potassium myristate, sodium oleate, and triethanolamine stearate; alkyl sulfates such as potassium lauryl sulfate, sodium lauryl sulfate, triethanolamine lauryl sulfate, and sodium myristyl sulfate; alkyl phosphoric acids and their salts such as lauryl phosphoric acid and sodium lauryl phosphate; polyoxyethylene alkyl ether sulfates such as polyoxyethylene (2) lauryl ether sodium sulfate and polyoxyethylene lauryl ether triethanolamine sulfate; sodium polyoxyethylene lauryl ether phosphate; polyoxyethylene alkyl ether phosphates; polyoxyethylene (4.5) lauryl ether sodium acetate alkyl ether carboxylates such as sodium thorium; N-acyl amino acid salts such as sodium N-acyl glutamate; N-acyl methyl amino acid salts such as sodium N-acyl methyl alanine, sodium lauroyl methyl taurine, and sodium caproyl methyl taurine; alkyl sulfosuccinates, acyl lactates, α-olefin sulfonates, α-sulfo fatty acid methyl ester salts, alkyl sulfosuccinates, alkane sulfonates, alkene sulfonates, acyl isethionates, alkyl sulfates, alkyl benzene sulfonates, fatty acid alkanolamide sulfates, monoacyl glycerin sulfates, alkyl phosphates, polyoxyethylene alkyl phenyl ether phosphates, and the like.

[0039] The cationic surfactant may be, for example, at least one selected from the group consisting of the following: Monoalkyl quaternary ammonium salts such as cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, dipolyoxyethyleneoleylmethylammonium chloride, polyoxyethylenebehenylmethylammonium chloride, behenyltrimethylammonium methylsulfate, stearylhydroxypropyltrimethylammonium chloride, and cetrimonium saccharin; dialkyl quaternary ammonium salts such as dicocoyldimethylammonium chloride, dialkyl(C12-C18)dimethylammonium chloride, lanolin fatty acid aminopropyldimethylammonium ethyl sulfate, dicocoylethylhydroxyethylammonium methylsulfate, coconut alkyl PG dimonium chloride phosphate, and linoleic acid amidopropyl PG dimonium chloride phosphate; trialkyl quaternary ammonium salts; monoalkyl ether type quaternary ammonium salts; fatty acid amidoamine salts; stearamidopropyldimethylamine; alkylamine salts; dimethylstearamine; POE coconut alkylamine; ethyl ethyl ethyl ethyl ethyl ethyl ethyl ammonium salts; Stearate-containing tertiary amine salts, Arcobel-type tertiary amine salts, alkylpyridinium salts, alkylisoquinolium salts, benzethonium chloride, benzalkonium-type quaternary ammonium salts, quaternium-91, etc.

[0040] The nonionic surfactant may be, for example, at least one selected from the group consisting of the following: Polyoxyethylene alkyl ethers such as POE(9) lauryl ether, POE(20) cetyl ether, POE(10) oleyl ether, POE(20) behenyl ether, beheneth-20, beheneth-30, ceteth-10, ceteth-15, ceteth-20, laureth-9, oleth-10, oleth-15, oleth-20, oleth-50, (C12-14) pareth-7, (C12-14) pareth-12; POE(20) POP(8) cetyl ether, POE(30) POP(6) decyl tetradecyl ether, POE(20) POP(4) polyoxyethylene polyoxypropylene alkyl ethers such as cetyl ether; sorbitan fatty acid esters such as sorbitan monooleate, sorbitan dioleate, sorbitan trioleate, sorbitan sesquioleate, sorbitan monostearate, sorbitan distearate, sorbitan tristearate, sorbitan isostearate, sorbitan sesquistearate, sorbitan monocaprate, sorbitan monolaurate, and sorbitan monopalmitate; POE(20) sorbitan monolaurate sorbitan monostearate, POE(20) sorbitan monooleate, POE(20) sorbitan monoisostearate, POE(20) sorbitan tristearate, POE(6) sorbitan monostearate, POE(6) sorbitan monooleate, polysorbate 40 and other polyoxyethylene sorbitan fatty acid esters; POE(6) sorbitan tetraoleate, POE(30) sorbitan tetraoleate, sorbeth-6 laurate, sorbeth-60 tetrastearate, sorbeth-60 tetraoleate ... polyoxyethylene sorbitol fatty acid esters such as Rubes-40 and Sorbeth-60 tetraoleate; polyoxyethylene hydrogenated castor oils such as POE(20) hydrogenated castor oil, POE(40) hydrogenated castor oil, POE(50) hydrogenated castor oil, POE(60) castor oil, POE(60) hydrogenated castor oil, POE(80) hydrogenated castor oil, and POE(100) hydrogenated castor oil; glycerin fatty acid esters such as glyceryl myristate, glyceryl stearate, glyceryl isostearate, glyceryl oleate, and glyceryl distearate;Polyglycerin fatty acid esters such as pentaglyceryl monolaurate, pentaglyceryl monomyristate, pentaglyceryl monooleate, pentaglyceryl monostearate, decaglyceryl distearate, polyglyceryl-6 laurate, polyglyceryl-10 laurate, polyglyceryl-10 myristate, polyglyceryl-10 palmitate, polyglyceryl-10 stearate, polyglyceryl-10 isostearate, polyglyceryl-10 oleate, and polyglyceryl-10 linoleate; polyoxyethylene glyceryls such as POE(5) glyceryl monostearate, POE(15) glyceryl monostearate, POE(15) glyceryl monooleate, PEG-7 glyceryl coconut oil fatty acid, PEG-20 glyceryl triisostearate, and PEG-10 glyceryl trioleate; serine fatty acid esters; glycol fatty acid esters such as PG stearate, PG distearate, and ethylene glycol stearate; polyethylene glycol fatty acid esters such as PEG-2 stearate, PEG-10 stearate, PEG-25 stearate, PEG-40 stearate, PEG-10 oleate, PEG-55 stearate, PEG-150 distearate, PEG-75 dilaurate, and PEG-4 diisostearate; sucrose fatty acid esters such as sucrose laurate, sucrose stearate, and sucrose palmitate; polyoxyethylene hydrogenated castor oil fatty acid esters such as PEG-20 hydrogenated castor oil laurate, PEG-20 hydrogenated castor oil isostearate, and PEG-50 hydrogenated castor oil triisostearate; polyoxyethylene isoalcohol ethers such as isoceteth-5, isoceteth-25, and isosteareth-20; POE(10) lanolin alcohol, POE(20) lanolin alcohol, and POE(40) lanolin alcohol Polyoxyethylene lanolin alcohols such as cholesteryl; fatty acid polyoxyethylene alkyl ethers such as ceteth-5 stearate and steareth-5 stearate; polyoxyalkylene sterols and polyoxyalkylene stanols such as PEG-5 phytosterol, PEG-30 phytosterol, PEG-20 phytostanol, and PPG-5 phytosterol; polyoxyethylene cholesteryl ethers such as cholestrol-10 and cholestrol-24; polyoxyethylene alkylamines such as PEG-15 cocamine and PEG-2 stearamine; polyoxyethylene alkylamides such as PEG-11 cocamide and PEG-3 lauramide; decyl glucoside, lauryl glucoside, and glyceryl glycerol. Alkyl glucosides such as glucoside, alkyl (C8-C16) glucoside, POE methyl glucoside, and POE dioleic acid methyl glucoside; alkyl alkanolamides such as palm kernel oil fatty acid diethanolamide, coconut oil fatty acid diethanolamide, lauric acid diethanolamide, and oleic acid diethanolamide; polyoxyethylene alkyl phenyl ether, polyoxyethylene hydrogenated castor oil succinic acid, polyoxyethylene castor oil, polyoxyethylene butylene glycol fatty acid ester, polyoxyethylene trimethylolpropane fatty acid ester, N-acyl glutamic acid ester, pyroglutamic acid ester, Pluronic type surfactants, etc.

[0041] The amphoteric surfactant may be, for example, at least one selected from the group consisting of the following: Glycine-type amphoteric surfactants such as N-acylamino acid ethyl-N-2-hydroxyethyl glycine salts; aminopropionic acid-type amphoteric surfactants such as sodium lauryl aminopropionate; alkyl sulfobetaines such as dodecylaminomethyl dimethyl sulfopropyl betaine and octadecylaminomethyl dimethyl sulfopropyl betaine; imidazoline-type amphoteric surfactants such as alkyl carboxymethyl hydroxyethyl imidazolium betaine and 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine; alkyl hydroxysulfobetaines such as lauryl hydroxysulfobetaine; amine oxide types such as amidosulfobetaine, sulfobetaine, and cocamidopropyl hydroxysultaine.

[0042] Examples of the other surfactants include at least one selected from the group consisting of the following: Silicone surfactants such as polyether-modified silicone, amino-modified silicone, and polyglycerin-modified silicone; fluorosurfactants; and natural surfactants such as lecithin, saponin, bile acid, surfactin, spiculisporic acid, agaric acid, long-chain dicarboxylic acids, rhamnolipids, trehalose lipids, succinoyl trehalose lipids, oligosaccharide fatty acid esters, and glycosyl lipids.

[0043] The content of surfactants other than the alkylamine oxide represented by the general formula (1-1) and the alkylbetaine represented by the general formula (1-2) in the concentrate is not particularly limited and can be appropriately selected in consideration of the type of surfactant and the application of the foamable aerosol composition, but is preferably 0.10 mass% to 15.00 mass%, more preferably 0.30 mass% to 12.00 mass%, and even more preferably 0.50 mass% to 10.00 mass%.

[0044] <Polyhydric alcohol> The concentrate contained in the foamable aerosol composition may contain a polyhydric alcohol. The polyhydric alcohol may be, for example, at least one selected from the group consisting of the following: Glycerin, diglycerin, propanediol, propylene glycol (PG), dipropylene glycol (DPG), butylene glycol such as 1,3-butylene glycol.

[0045] The content of the polyhydric alcohol in the concentrate is preferably 0.50% by mass to 20.00% by mass, more preferably 1.00% by mass to 15.00% by mass, and further preferably 2.00% by mass to 10.00% by mass.

[0046] <Other additives> The concentrate contained in the foaming aerosol composition may contain additives such as water-miscible (non-phase-separating) active ingredients, fragrances, antioxidants, preservatives, acidic pH adjusters, thickeners, moisturizers, bactericides, skin protectants (amino acids), vitamins, various extracts, deodorants, coolants, ultraviolet absorbers, ultraviolet scattering agents, pest repellent components, and others, to the extent that the above effects are not impaired. For example, alcohol may be contained. Specific examples include the following. Lower alcohols (e.g., aliphatic monohydric alcohols having 1 to 3 carbon atoms such as ethanol); acidic pH adjusters (e.g., citric acid, lactic acid); rust inhibitors (e.g., ammonia water, ammonium benzoate, sodium nitrite); preservatives (e.g., parabens, phenoxyethanol, methyl paraoxybenzoate); urea; minerals such as calcium, iron, sodium, etc.; pigments; colorants; anti-inflammatory agents (e.g., dipotassium glycyrrhizinate); ultraviolet absorbers (e.g., terephthalidenedicamphorsulfonic acid), etc.

[0047] <Propellant> The foaming aerosol composition contains a propellant. The propellant also contains carbon dioxide gas. By containing carbon dioxide gas in the propellant, it is possible to impart high detergency to the foaming aerosol composition.

[0048] Carbon dioxide gas is preferably filled so that the pressure inside the aerosol container (gauge pressure) at 25°C is 0.1 MPa to 1.0 MPa, and more preferably 0.2 MPa to 0.9 MPa.

[0049] The propellant preferably further contains a liquefied gas. When the propellant contains a liquefied gas, a foam with a better texture can be obtained. The liquefied gas is not particularly limited, and any known gas that can be used in aerosol products can be used. For example, hydrocarbons such as LPG, LNG, isopentane, and isobutane, dimethyl ether, and hydrofluoroolefins such as HFO-1234ze can be used. The mixing ratio of the liquefied gas to the concentrate is preferably 0.5 to 15 parts by mass, and more preferably 1 to 10 parts by mass, per 100 parts by mass of the concentrate.

[0050] The propellant may further contain a compressed gas other than carbon dioxide gas. The compressed gas is not particularly limited, and any known gas that can be used in aerosol products can be used. Examples include nitrogen gas, nitrous oxide gas, argon, helium, and compressed air.

[0051] [Method of producing foamable aerosol composition] The method for producing the foamable aerosol composition is not particularly limited, and a known method can be used. For example, at least one selected from the group consisting of alkylamine oxide represented by general formula (1-1) and alkylbetaine represented by general formula (1-2), fatty acid, alkali agent, water, and other components as necessary are stirred and mixed in any ratio, and emulsified using a rotary homogenizer, high-pressure homogenizer, ultrasonic emulsifier, etc. as necessary to form a stock solution, which is then filled with a propellant containing carbon dioxide gas.

[0052] The use of the foamable aerosol composition is not particularly limited, and it can be used for personal care products, household products, industrial products, etc. The use of the foamable aerosol composition is preferably skin cosmetics such as body cleansers and shaving agents, and household detergents.

[0053] [Aerosol products] An aerosol product according to one embodiment of the present invention (hereinafter, also simply referred to as "aerosol product") is an aerosol product in which the foamable aerosol composition is filled in an aerosol container. The aerosol container used for the aerosol product may be any of various known pressure-resistant containers. In addition, the structure for mounting the valve device may be appropriately selected depending on the type of pressure-resistant container.

[0054] The aerosol product is produced by filling the foamable aerosol composition into an aerosol container, i.e., a pressure-resistant container equipped with an aerosol valve (spray valve). For example, a concentrate is prepared, and the concentrate and a propellant containing carbon dioxide gas are filled into an aerosol container to produce the aerosol product. A so-called double-structure container may be used in which an inner container is further provided inside the pressure-resistant container to isolate the propellant from the emulsion composition.

[0055] The form of the aerosol product to be sprayed is not particularly limited, but is preferably foam-like. The spray mechanism of the aerosol product is also not particularly limited, and any known actuator capable of spraying the product in foam form may be used. EXAMPLES

[0056] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the embodiments of the following examples.

[0057] <Examples 1 to 30 and Comparative Examples 1 to 20> A total of 100 g of each raw material was placed in a glass beaker according to the formulation (mass %) shown in Tables 1 to 4 and mixed with heating as necessary to obtain stock solutions of Examples 1 to 30 and Comparative Examples 1 to 20.

[0058] Furthermore, the obtained concentrate and the propellant shown in Tables 1 to 4 were filled into a pressure-resistant glass bottle to obtain a foaming aerosol composition. The spray mechanism used was "FD129W"3" (Mitani Valve Co., Ltd.). Furthermore, the foamable aerosol compositions were used to carry out the evaluations described below. The results are shown in Tables 1 to 4.

[0059] (1)Low temperature stability The foamable aerosol composition filled in a pressure-resistant glass bottle was stored for 7 days at 5° C. After storage, the appearance was observed and evaluated according to the following evaluation criteria.

[0060] (Evaluation Criteria) A: No precipitation was observed. B: A small amount of fine solid matter precipitates, but it is easily dispersible. C: Somewhat coarse precipitates were observed. D: Coarse precipitates are observed.

[0061] (2) Fluidity of internal liquids The foamable aerosol composition filled in a pressure-resistant glass bottle was stored for 7 days at 5° C. The fluidity of the oral liquid after storage was evaluated according to the following evaluation criteria.

[0062] (Evaluation Criteria) A: It has high fluidity, and the contents begin to flow as soon as the pressure-resistant glass bottle is tilted. B: The liquid thickens slightly but is highly fluid, and the contents begin to flow when the pressure-resistant glass bottle is tilted. C: The liquid thickens and has low fluidity, so that the liquid does not flow out quickly even when the pressure-resistant glass bottle is tilted. D: The liquid has lost its fluidity and does not flow even when the pressure-resistant glass bottle is tilted.

[0063] (3) Foaming power The foamable aerosol composition filled in a pressure-resistant glass bottle was adjusted to a temperature of 25° C., and 1 g of the composition was discharged onto a glass plate. The appearance of the foam was observed and evaluated according to the following evaluation criteria.

[0064] (Evaluation Criteria) A: Forms a dense foam. B: Forms a slightly dense foam. C: Forms a soft, refreshing foam. D: Does not form foam.

[0065] (4) Smoothness of foam The foamable aerosol composition filled in a pressure-resistant glass bottle was adjusted to a temperature of 25° C., and 1 g of the composition was discharged onto a glass plate. The foam was stirred with fingers and evaluated according to the following evaluation criteria.

[0066] (Evaluation Criteria) A: The foam is smooth. B: Slightly dry, but the foam has sufficient fluidity and is smooth. C: Dry foam that is not smooth and difficult to stir. D: The foam is dry, not smooth and cannot be stirred.

[0067] (5) Cleaning power 0.006 g of lipstick was measured and spread on the artificial skin to create a stain. 0.5 g of the foamable aerosol composition filled in a pressure-resistant glass bottle was adjusted to 25° C. and discharged to blend into the stain. The foam was washed off with tap water, and the lipstick remaining on the artificial skin was evaluated according to the following evaluation criteria. With regard to (5) detergency, the evaluation results of the foamable aerosol compositions of Examples 7 to 30 were all rated "A."

[0068] (Evaluation Criteria) A: Most of the lipstick was washed away. B: A small amount of lipstick remained but was washed away. C: A small amount of lipstick remained. D: Most of the lipstick remained.

[0069] [Table 1]

[0070] [Table 2]

[0071] [Table 3]

[0072] [Table 4]

[0073] In the table, the raw materials used are as follows:

[0074] (fatty acid) Lauric acid: Lunac L-98 (a mixture of 0.5% capric acid, 99% lauric acid, and 0.5% myristic acid: Kao Corporation) Myristic acid: Lunac MY-98 (a mixture of 0.5% lauric acid, 99% myristic acid, and 0.5% palmitic acid: Kao Corporation) Palmitic acid: Lunac P-95 (a mixture of 2% myristic acid, 96% palmitic acid, and 2% stearic acid: Kao Corporation) Stearic acid: Lunac S-98 (a mixture of 2% palmitic acid, 97% stearic acid, and 1% arachidic acid: Kao Corporation)

[0075] (Alkaline agent) Triethanolamine: Triethanolamine 99% (Dow Chemical Japan Co., Ltd.) Water, potassium hydroxide (48%): Potassium hydroxide aqueous solution 48% (Tokyo Ohka Kogyo Co., Ltd.) Tetrahydroxypropylethylenediamine: Adeka Carpol MD-100 (ADEKA Corporation) 2-Amino-2-methyl-1-propanol: AMP-95 (ANGUS Chemical Company) L-Arginine: L-Arginine C Grade (Ajinomoto Co., Inc.)

[0076] (Alkylamine oxide) Water, lauramine oxide (35%): Amphitol 20N (Kao Corporation) Water, stearamine oxide (35%): Unisafe A-SM (NOF Corporation) Water, dihydroxyethyl lauramine oxide (40%): Unisafe A-LE (NOF Corporation) (Alkylbetaine) Water, lauramidopropyl betaine (30%): Amphitol 20AB (Kao Corporation) Water, lauryl betaine (35%): NIKKOL AM-301 (Nikko Chemicals Co., Ltd.)

[0077] (Oily ingredients) Liquid paraffin: Carnation (Sonneborn LLC) Isopropyl myristate: NIKKOL IPM-100 (Nikko Chemicals Co., Ltd.) Dimethicone: KF-96L-2cs (Shin-Etsu Chemical Co., Ltd.) Squalane: NIKKOL Squalane (Nikko Chemicals Co., Ltd.) Cetanol: Kalcol 6098 (Kao Corporation) Glycerin monocetyl ether: NIKKOL Chimyl Alcohol 100 (Nikko Chemicals Co., Ltd.)

[0078] (Polyhydric alcohol) Butylene glycol: 1,3-butylene glycol-P (KH Neochem Co., Ltd.)

[0079] (Surfactant) Oleth-10: NIKKOL BO-10V (Nikko Chemicals Co., Ltd.) Polyglyceryl-10 laurate: NIKKOL Decaglyn 1-L (Nikko Chemicals Co., Ltd.) Sorbitan sesquioleate: NIKKOL SO-15V (Nikko Chemicals Co., Ltd.) PEG-40 stearate: NIKKOL MYS-40V (Nikko Chemicals Co., Ltd.) Sodium lauroyl methyl taurate: NIKKOL LMT (Nikko Chemicals Co., Ltd.) Water, sodium caproyl methyl taurate (26%): Diapon HF-SF (NOF Corporation) Water, polyoxyethylene (4.5) sodium lauryl ether acetate (24%): Kao Akipo RLM-45NV (Kao Corporation) Water, polyoxyethylene (2) sodium lauryl ether sulfate (27%): Emal E-27C (Kao Corporation) Palm kernel oil fatty acid diethanolamide: Aminone PK-02S (Kao Corporation)

[0080] (base material) Water: Purified water (Toyo Aerosol Industry Co., Ltd.)

Claims

1. A foamable aerosol composition comprising a propellant and a concentrate, The stock solution contains at least one selected from the group consisting of an alkylamine oxide represented by general formula (1-1) and an alkylbetaine represented by general formula (1-2), as well as a salt of a fatty acid and an alkaline agent; 【Chemistry 1】 [In the general formula (1-1), R １ represents an alkyl group having 8 to 22 carbon atoms; R ２ and R ３ are each independently an alkyl group having 1 to 4 carbon atoms or -(AO) ｍ H (A represents an alkylene group having 2 to 4 carbon atoms, and m represents an integer of 1 to 5), Z represents -O- or -CONH-, x represents an integer of 0 to 4, and n represents an integer of 2 to 4. 【Chemistry 2】 [In the general formula (1-2), R ４ represents an alkyl group having 7 to 22 carbon atoms. The foamable aerosol composition, wherein the propellant comprises carbon dioxide gas.

2. In the general formula (1-1), R １ represents an alkyl group having 10 to 20 carbon atoms; R ２ and R ３ each independently represents an alkyl group having 1 to 2 carbon atoms or -(AO) ｍ H (A represents an alkylene group having 2 to 3 carbon atoms, and m represents an integer of 1 or 2), and x represents 0; In the general formula (1-2), R ４ The foamable aerosol composition according to claim 1, wherein represents an alkyl group having 7 to 17 carbon atoms.

3. 2. The foamable aerosol composition according to claim 1, wherein the fatty acid contains 60% by mass or more of fatty acids having 10 to 16 carbon atoms.

4. 2. The foamable aerosol composition according to claim 1, wherein the alkaline agent comprises at least one selected from the group consisting of triethanolamine, 2-amino-2-methyl-1-propanol, and L-arginine.

5. 10. The foamable aerosol composition of claim 1, wherein said propellant further comprises a liquefied gas.

6. An aerosol product in which a foamable aerosol composition is filled in an aerosol container, An aerosol product, wherein the foamable aerosol composition is the foamable aerosol composition according to any one of claims 1 to 5.

Images