Aerosol composition

Abstract

To provide an aerosol composition which comprises an aerosol stock solution obtained by blending a cationic surfactant and a higher alcohol in high concentrations and a propellant containing carbon dioxide, has excellent storage stability and is not required to be shaken immediately before use.SOLUTION: There is provided an aerosol composition which comprises: an aerosol stock solution containing (A) a cationic surfactant and (B) a straight chain saturated higher alcohol in which the component (A) includes a mono long chain alkyl type cationic surfactant (A1), the content of the component (A) is 0.9 mass% or more and less than 6.0 mass% and the molar ratio [(B) / (A1) of the component (B) to the component (A1) is 3.0 or more and 7.0 or less; and a propellant (C) containing carbon dioxide.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an aerosol composition.

Background Art

[0002] Aerosol cosmetics can be used by discharging the cosmetic, which is an aerosol stock solution, in a foamy state, and thus have the advantage of being easily spread on the skin or hair. Care components according to desired performance and uses are formulated in the aerosol stock solution. For example, when the aerosol cosmetic is a hair cosmetic such as a rinse, a treatment agent, or a conditioning agent, a cationic surfactant is used for the purpose of imparting a conditioning effect, and a higher alcohol is formulated for the purpose of imparting a smooth feeling in use and a good finish. It is known that by formulating a cationic surfactant and a higher alcohol at a high concentration, the smooth feeling in use and the good finish can be further improved.

[0003] Aerosol cosmetics using carbon dioxide gas as an aerosol are also known. When carbon dioxide gas is used as the aerosol of the aerosol cosmetic, creamy and elastic-textured foam can be discharged, and the feeling in use becomes good. Further, the foam persists for a long time without disappearing immediately. Furthermore, by confining carbon dioxide gas in the discharged foam, an effect can be expected that the carbon dioxide gas acts as a beauty care component such as anti-aging care when applied to the skin or hair.

[0004] As an aerosol cosmetic using carbon dioxide gas as an aerosol, for example, Patent Document 1 discloses an aerosol composition containing an aqueous stock solution containing water and a surfactant and an aerosol containing a compressed gas such as a liquefied gas and carbon dioxide gas, wherein the weight ratio of the aqueous stock solution to the liquefied gas, the content of the surfactant, and the content of dimethyl ether as the liquefied gas are within a predetermined range, and can provide a discharge product having gloss, a soft cream-like fineness, and very good foam disappearance. Patent Document 2 discloses that an extremely rich, creamy, and glossy aerosol mousse can be achieved with an aerosol composition for hair conditioning purposes, comprising a predetermined amount of a cationic surfactant, an aliphatic alcohol, carbon dioxide, and an additional propellant. Patent Document 3 discloses a cosmetic composition in a container of a predetermined shape comprising at least one inner bag and an outer container, wherein the composition contains a predetermined amount of a cationic surfactant, a fatty alcohol, and carbon dioxide, and that such a cosmetic composition, such as a hair conditioner, can form a stable mousse. Patent Document 4 discloses an aerosol-type hair treatment composition, such as a hair care agent, which includes a stock solution containing at least one selected from branched alcohols or ethanol of a predetermined structure, a linear saturated higher alcohol, and an amidoamine, and is used with a propellant added, that allows for smooth discharge from the container together with the propellant while improving the feel of the hair. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-253409 [Patent Document 2] Special Publication No. 2009-501781 [Patent Document 3] Special Publication No. 2014-513695 [Patent Document 4] Japanese Patent Publication No. 2016-88843 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, aerosol compositions containing a high concentration of cationic surfactants and higher alcohols, along with a carbon dioxide-containing propellant, can separate over time, necessitating improvements in storage stability. For example, aerosol compositions containing liquefied petroleum gas (LPG) as a propellant typically undergo a shaking of the aerosol container immediately before use to ensure uniform mixing before foam is dispensed, thus avoiding the aforementioned problem. The present invention aims to provide an aerosol composition that contains an aerosol concentrate containing a cationic surfactant and a higher alcohol at high concentrations, and a propellant containing carbon dioxide, and that has excellent storage stability, eliminating the need for shaking immediately before use. [Means for solving the problem]

[0007] The present inventors have found that an aerosol composition containing an aerosol stock solution containing a predetermined cationic surfactant and a linear saturated higher alcohol in a predetermined ratio, and a propellant containing carbon dioxide, can solve the above problem. In other words, the present invention is (A) Cationic surfactants, and (B) Straight-chain saturated higher alcohols The present invention relates to an aerosol composition containing an aerosol concentrate in which component (A) contains a monolong-chain alkyl cationic surfactant (A1), the content of component (A) is 0.9% by mass or more and less than 6.0% by mass, and the molar ratio of component (B) to component (A1) [(B) / (A1)] is 3.0 or more and 7.0 or less, and a propellant (C) containing carbon dioxide. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an aerosol composition that contains an aerosol concentrate containing a cationic surfactant and a higher alcohol at high concentrations, and a propellant containing carbon dioxide, and that has excellent storage stability and does not require shaking immediately before use. [Modes for carrying out the invention]

[0009] [Aerosol composition] The aerosol composition of the present invention (hereinafter also simply referred to as "the composition of the present invention") is (A) Cationic surfactants, and (B) Straight-chain saturated higher alcohols The aerosol composition contains an aerosol concentrate in which component (A) contains a monolong-chain alkyl cationic surfactant (A1), the content of component (A) is 0.9% by mass or more and less than 6.0% by mass, and the molar ratio of component (B) to component (A1) [(B) / (A1)] is 3.0 or more and 7.0 or less, and a propellant (C) containing carbon dioxide. The composition of the present invention exhibits excellent storage stability and does not separate over time, even when used in combination with an aerosol concentrate containing a cationic surfactant and a higher alcohol at high concentrations, and a propellant containing carbon dioxide. In this invention, "containing component X" also means "composed of component X".

[0010] The reason why the aerosol composition of the present invention achieves the effects of the present invention due to the above configuration is not clear, but it can be inferred as follows. The aerosol concentrate used in the aerosol composition of the present invention contains a cationic surfactant (A) (hereinafter also simply referred to as "component (A)") and a linear saturated higher alcohol (B) (hereinafter also simply referred to as "component (B)"). Cationic surfactant (A) is used to improve the foaming properties of the aerosol and to impart desired performance according to the intended use of the aerosol composition. For example, if the aerosol composition is a hair cosmetic composition, it can provide hair conditioning effects, a smooth feel, and a good finish. In the present invention, the cationic surfactant (A) includes a monolong-chain alkyl type cationic surfactant (A1) (hereinafter also simply referred to as "component (A1)"). In order to improve the foam discharge performance in aerosols, it is preferable that the aerosol concentrate has low viscosity. By using component (A1) as the cationic surfactant, the hair conditioning effect is enhanced, providing a smooth feel and good finish, while also making the aerosol concentrate less viscous. Higher alcohols, when incorporated into hair cosmetic compositions, can also impart a smooth feel and a good finish. Carbon dioxide, used as a propellant (C), has higher foaming properties than liquefied petroleum gas (LPG) and higher solubility in water compared to other propellants such as nitrogen. Therefore, using carbon dioxide as a propellant allows for the discharge of fine, dense bubbles containing carbon dioxide.

[0011] However, it has been found that when an aerosol concentrate containing a large amount of cationic surfactant and higher alcohols, and with low viscosity, is filled with a propellant containing carbon dioxide and stored, separation may occur over time. This phenomenon is thought to be due to a change in the dissolved state of carbon dioxide in the aerosol concentrate over time, which causes the cationic surfactant and higher alcohols to separate and precipitate. As mentioned above, for example, aerosol compositions containing LPG as a propellant are usually shaken in the aerosol container immediately before use to ensure uniform mixing before dispensing foam, so the above problem had not been identified.

[0012] As a result of the inventors' investigation, it was found that storage stability can be improved by using a predetermined amount of monolong-chain alkyl cationic surfactant (A1) as the cationic surfactant (A), and further using a linear saturated higher alcohol (B) as the higher alcohol in a predetermined ratio to component (A1). This is thought to be because linear saturated higher alcohol (B) has a higher effect of stably dispersing in the aerosol composition when used in combination with component (A1) compared to branched saturated higher alcohols. Furthermore, by setting the content of the cationic surfactant (A) in the aerosol composition within a predetermined range and setting the molar ratio of component (B) to component (A1) to 3.0 or more and 7.0 or less, the dispersion stability of components (A1) and component (B) in the aerosol composition is increased, separation of the composition is suppressed, and it is considered that the storage stability can be enhanced.

[0013] The use of the aerosol composition of the present invention is not particularly limited, but from the viewpoint of obtaining the effects of a cationic surfactant and a linear saturated higher alcohol, it is preferably a hair cosmetic composition. Examples of the hair cosmetic composition include hair cleaning agents such as shampoos, rinses, conditioning agents, treatment agents (including those not to be rinsed off), styling agents, hair dyes, hair growth agents, and the like. Among these, from the viewpoint of containing a cationic surfactant, the aerosol composition is preferably a rinse, a conditioning agent, a treatment agent, or a styling agent, and more preferably a rinse, a conditioning agent, or a treatment agent.

[0014] <Component (A): Cationic surfactant> The aerosol stock solution constituting the aerosol composition of the present invention contains a cationic surfactant as component (A). Component (A) is used to impart foam discharge properties by the aerosol and desired performance to the aerosol composition. Also, from the viewpoint of reducing the viscosity of the aerosol stock solution, component (A) includes a mono-long-chain alkyl type cationic surfactant (A1).

[0015] (Mono-long-chain alkyl type cationic surfactant (A1)) Examples of component (A1) include alkyltrimethylammonium salts (A1-1), alkoxyalkyltrimethylammonium salts (A1-2), alkylamidealkyltrimethylammonium salts (A1-3), alkyldimethylamines and their salts (A1-4), alkoxyalkyldimethylamines and their salts (A1-5), and alkylamidealkyldimethylamines and their salts (A1-6), etc. One or two or more of these can be used.

[0016] As the alkyltrimethylammonium salt (A1-1), preferably an alkyltrimethylammonium salt having a long-chain alkyl group with 8 to more preferably 8 to more preferably 12 to 18 carbon atoms is exemplified. Specifically, cetyltrimethylammonium chloride (cetrimonium chloride), stearyltrimethylammonium chloride (steartrimonium chloride), behenyltrimethylammonium chloride, etc. are exemplified.

[0017] As the alkoxyalkyltrimethylammonium salt (A1-2), preferably an alkoxyalkyltrimethylammonium salt having a long-chain alkoxy group with 8 to more preferably 8 to more preferably 12 to 18 carbon atoms is exemplified. Specifically, stearoxypropyltrimethylammonium chloride, stearoxyethyltrimethylammonium chloride, stearoxyhydroxypropyltrimethylammonium chloride, etc. are exemplified.

[0018] As the alkylamidoalkyltrimethylammonium salt (A1-3), preferably an alkylamidoalkyltrimethylammonium salt having a long-chain alkyl group with 8 to more preferably 8 to more preferably 12 to 18 carbon atoms is exemplified. Specifically, palmitamidopropyltrimethylammonium chloride (palmitamidopropyltrimonium chloride), etc. are exemplified.

[0019] Alkyldimethylamine, alkoxyalkyldimethylamine, and alkylamidalkyldimethylamine react with an acid to form a tertiary amine salt and become a cationic surfactant. The alkyl group in the alkyldimethylamine and its salt (A1-4) and the alkoxyalkyldimethylamine and its salt (A1-5) is preferably a long-chain alkyl group with 8 to more preferably 8 to more preferably 12 to 18 carbon atoms. The alkyl group in alkylamide alkyldimethylamine and its salts (A1-6) is preferably a long-chain alkyl group having 7 to 21 carbon atoms, more preferably 7 to 17 carbon atoms, and even more preferably 11 to 17 carbon atoms.

[0020] Alkyldimethylamine, alkoxyalkyldimethylamine, and alkylamidealkyldimethylamine may be reacted with an acid beforehand to form salts which are then added to the aerosol concentrate. Alternatively, they may be added directly as amines to the aerosol concentrate, and then an acid may be added to the aerosol concentrate to form salts in the concentrate. Therefore, the above amines and their salts are defined here as cationic surfactants. Their content is calculated as the mass or molar amount of the above amines. Examples of salts of the above amines include salts with organic or inorganic acids. Examples of organic acids include monocarboxylic acids such as acetic acid and propionic acid; dicarboxylic acids such as malonic acid, succinic acid, glutaric acid, adipic acid, maleic acid, fumaric acid, and phthalic acid; polycarboxylic acids such as polyglutamic acid; hydroxycarboxylic acids such as glycolic acid, lactic acid, hydroxyacrylic acid, glyceric acid, malic acid, tartaric acid, and citric acid; and acidic amino acids such as glutamic acid and aspartic acid. Examples of inorganic acids include hydrochloric acid, sulfuric acid, and phosphoric acid. Among these, organic acids are preferred, and one or more selected from the group consisting of dicarboxylic acids, hydroxycarboxylic acids, and acidic amino acids are more preferred. As for dicarboxylic acids, one or more selected from the group consisting of maleic acid and succinic acid are more preferred. As for hydroxycarboxylic acids, one or more selected from the group consisting of glycolic acid, lactic acid, and malic acid are more preferred. As for acidic amino acids, glutamic acid is more preferred.

[0021] Examples of alkyldimethylamines and their salts (A1-4) include N,N-dimethylbehenylamine, N,N-dimethylstearylamine, and their organic salts, with N,N-dimethylbehenylamine, N,N-dimethylstearylamine, and their lactates or glycolates being preferred.

[0022] Examples of alkoxyalkyldimethylamines and their salts (A1-5) include N,N-dimethyl-3-hexadecyloxypropylamine, N,N-dimethyl-3-octadecyloxypropylamine, and their organic salts, with N,N-dimethyl-3-hexadecyloxypropylamine, N,N-dimethyl-3-octadecyloxypropylamine (stearoxypropyldimethylamine), and their lactates or glycolates being preferred.

[0023] Examples of alkylamide alkyldimethylamines and their salts (A1-6) include N-[3-(dimethylamino)propyl]docosanamide (dimethylaminopropyl docosanate), N-[3-(dimethylamino)propyl]stearamide (dimethylaminopropyl stearate), and their organic salts, with N-[3-(dimethylamino)propyl]docosanamide, N-[3-(dimethylamino)propyl]stearamide, and their lactates or glycolates being preferred.

[0024] Component (A1) may consist of one or more types. Among the above, component (A1) is preferably one or more selected from the group consisting of alkyldimethylamine and its salts (A1-4), alkoxyalkyldimethylamine and its salts (A1-5), and alkylamidealkyldimethylamine and its salts (A1-6), from the viewpoint of improving storage stability and foam discharge performance by aerosol, from the viewpoint of providing a hair conditioning effect, a smooth feel and good finish when the aerosol composition is a hair cosmetic composition, and from the viewpoint of suppressing corrosion of the aerosol container. More preferably, it is one or more selected from the group consisting of alkoxyalkyldimethylamine and its salts (A1-5) and alkylamidealkyldimethylamine and its salts (A1-6), and even more preferably, it is one or more selected from the group consisting of N,N-dimethyl-3-octadecyloxypropylamine and dimethylaminopropyl stearate.

[0025] The content of component (A1) in the aerosol concentrate is 0.9% by mass or more, preferably 1.0% by mass or more, more preferably 1.2% by mass or more, and even more preferably 1.3% by mass or more, from the viewpoint of storage stability and improved foam discharge performance by the aerosol, and when the aerosol composition is a hair cosmetic composition, from the viewpoint of providing a hair conditioning effect, a smooth feel, and a good finish. Furthermore, from the viewpoint of storage stability and improved foam discharge performance by the aerosol, it is less than 6.0% by mass, preferably 5.0% by mass or less, more preferably 4.0% by mass or less, even more preferably 3.5% by mass or less, even more preferably 3.0% by mass or less, and even more preferably 2.5% by mass or less. The specific range of the content of component (A1) in the aerosol concentrate is 0.9% by mass or more and less than 6.0% by mass, preferably 0.9 to 5.0% by mass, more preferably 0.9 to 5.0% by mass, even more preferably 0.9 to 4.0% by mass, even more preferably 0.9 to 3.5% by mass, even more preferably 0.9 to 3.0% by mass, even more preferably 0.9 to 2.5% by mass, even more preferably 1.0 to 2.5% by mass, even more preferably 1.2 to 2.5% by mass, and even more preferably 1.3 to 2.5% by mass.

[0026] Furthermore, the content of component (A1) in component (A) is preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, even more preferably 80% by mass or more, and even more preferably 90% by mass or more, and 100% by mass or less, from the viewpoint of storage stability and improved foam discharge performance by aerosol, and from the viewpoint of providing a hair conditioning effect, a smooth feel, and a good finish when the aerosol composition is a hair cosmetic composition.

[0027] Component (A) may also contain cationic surfactants other than component (A1). Examples of cationic surfactants other than component (A1) include di-long-chain alkyl type cationic surfactant (A2) (hereinafter also simply referred to as "component (A2)"). Using component (A2) can improve the miscibility between the aerosol concentrate and the carbon dioxide in the propellant (C).

[0028] (Dilong-chain alkyl-type cationic surfactant (A2)) Examples of di-long-chain alkyl-type cationic surfactants include dialkyldimethylammonium salts, preferably dimethylammonium salts having a long-chain dialkyl group with 8 to 22 carbon atoms, more preferably 8 to 18 carbon atoms, and even more preferably 12 to 18 carbon atoms. Specifically, examples include distearyldimethylammonium chloride and dialkyl(C12-18)dimethylammonium chloride, and one or more of these can be used.

[0029] When component (A2) is used, the content of component (A2) in the aerosol stock solution is preferably 0.001% by mass or more, more preferably 0.005% by mass or more, and more preferably 0.02% by mass or more, from the viewpoint of improving the miscibility between the aerosol stock solution and the carbon dioxide in the propellant (C). Furthermore, from the viewpoint of improving storage stability, it is preferably 2.0% by mass or less, more preferably 1.5% by mass or less, even more preferably 1.0% by mass or less, even more preferably 0.5% by mass or less, and even more preferably 0.2% by mass or less. The specific range of the content of component (A2) in the aerosol stock solution is preferably 0.001 to 2.0% by mass, more preferably 0.001 to 1.5% by mass, even more preferably 0.001 to 1.0% by mass, even more preferably 0.005 to 1.0% by mass, even more preferably 0.01 to 1.0% by mass, even more preferably 0.01 to 0.5% by mass, and even more preferably 0.01 to 0.2% by mass.

[0030] The content of component (A) in the aerosol concentrate is 0.9% by mass or more, preferably 1.0% by mass or more, more preferably 1.2% by mass or more, and even more preferably 1.3% by mass or more, from the viewpoint of providing a hair conditioning effect, a smooth feel, and a good finish when the aerosol composition is a hair cosmetic composition. Furthermore, from the viewpoint of storage stability and miscibility with carbon dioxide in the propellant (C), it is less than 6.0% by mass, preferably 5.0% by mass or less, more preferably 4.0% by mass or less, and even more preferably 3.5% by mass or less. The specific range of the content of component (A) in the aerosol concentrate is 0.9% by mass or more and less than 6.0% by mass, preferably 0.9 to 5.0% by mass, more preferably 0.9 to 4.0% by mass, even more preferably 0.9 to 3.5% by mass, even more preferably 1.0 to 3.5% by mass, even more preferably 1.2 to 3.5% by mass, and even more preferably 1.3 to 3.5% by mass.

[0031] <Component (B): Linear saturated higher alcohol> The aerosol concentrate constituting the aerosol composition of the present invention contains a linear saturated higher alcohol as component (B). Component (B) is used to impart desired performance to the aerosol composition. For example, if the aerosol composition is a hair cosmetic composition, it can provide the hair with a smooth feel and a good finish. Furthermore, even when the cationic surfactant component (A) and component (B) are used in combination in the aerosol concentrate, and the aerosol concentrate is used in combination with a propellant (C) containing carbon dioxide, separation does not occur over time due to the aforementioned mechanism of action, and excellent storage stability is achieved, making it possible to create an aerosol composition that does not require shaking immediately before use.

[0032] The number of carbon atoms in the linear saturated higher alcohol, which is component (B), is preferably 12 to 22, more preferably 12 to 18, and even more preferably 16 to 18. Examples of component (B) include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, etc., and one or more of these can be used. Among these, from the viewpoint of improving storage stability and, when the aerosol composition is a hair cosmetic composition, from the viewpoint of providing a smooth feel and good finish to the hair, it is preferably one or more selected from the group consisting of lauryl alcohol, cetyl alcohol, and stearyl alcohol, more preferably one or more selected from the group consisting of cetyl alcohol and stearyl alcohol, and even more preferably stearyl alcohol.

[0033] Furthermore, from the viewpoint of further improving the storage stability of the aerosol composition, it is preferable that the difference between the number of carbon atoms in the long-chain alkyl group in component (A1) and the number of carbon atoms in component (B) is small. More specifically, the difference between the number of carbon atoms in the long-chain alkyl group in component (A1) and the number of carbon atoms in component (B) is preferably 6 or less, more preferably 4 or less, even more preferably 2 or less, and even more preferably 0.

[0034] The content of component (B) in the aerosol concentrate is preferably 1.5% by mass or more, more preferably 2.0% by mass or more, and even more preferably 2.5% by mass or more, from the viewpoint of improving storage stability and, when the aerosol composition is a hair cosmetic composition, from the viewpoint of providing a smooth feel and good finish to the hair. Furthermore, from the viewpoint of improving the foam discharge performance of the aerosol, it is preferably 32% by mass or less, more preferably 25% by mass or less, even more preferably 20% by mass or less, even more preferably 15% by mass or less, and even more preferably 10% by mass or less. The specific range of the content of component (B) in the aerosol concentrate is preferably 1.5 to 32% by mass, more preferably 2.0 to 25% by mass, even more preferably 2.0 to 20% by mass, even more preferably 2.0 to 15% by mass, and even more preferably 2.5 to 10% by mass.

[0035] The total content of component (A) and component (B) in the aerosol stock solution is preferably 1.5% by mass or more, more preferably 2.0% by mass or more, even more preferably 2.5% by mass or more, even more preferably 3.0% by mass or more, and even more preferably 4.0% by mass or more, from the viewpoint of improving storage stability and imparting desired performance to the aerosol composition. Furthermore, from the viewpoint of improving the foam discharge performance of the aerosol, it is preferably 32% by mass or less, more preferably 25% by mass or less, even more preferably 20% by mass or less, even more preferably 15% by mass or less, and even more preferably 12% by mass or less. The specific range of the total content of component (A) and component (B) in the aerosol stock solution is preferably 1.5 to 32% by mass, more preferably 2.0 to 25% by mass, even more preferably 2.0 to 20% by mass, even more preferably 2.0 to 15% by mass, even more preferably 2.5 to 12% by mass, even more preferably 3.0 to 12% by mass, and even more preferably 4.0 to 12% by mass.

[0036] The molar ratio of component (B) to component (A1) in the aerosol stock solution [(B) / (A1)] is 3.0 or higher from the viewpoint of improving storage stability due to the aforementioned mechanism of action, and is 7.0 or lower, preferably 6.0 or lower, more preferably 5.0 or lower, and even more preferably 4.0 or lower from the viewpoint of miscibility with carbon dioxide in the propellant (C) and improvement of foam discharge performance by the aerosol.

[0037] The molar ratio of component (B) to component (A) in the aerosol stock solution [(B) / (A)] is preferably 2.9 or higher, more preferably 3.0 or higher, from the viewpoint of improving storage stability due to the aforementioned mechanism of action, and is 7.0 or lower, preferably 6.0 or lower, more preferably 5.0 or lower, and even more preferably 4.0 or lower, from the viewpoint of miscibility with carbon dioxide in the propellant (C) and improvement of foam discharge performance by the aerosol. The specific range of the molar ratio of component (B) to component (A) in the aerosol stock solution [(B) / (A)] is 7.0 or lower, preferably 2.9 to 7.0, more preferably 3.0 to 7.0, even more preferably 3.0 to 5.0, and even more preferably 3.0 to 4.0.

[0038] <Aqueous medium> Aerosol concentrates typically contain an aqueous medium for dissolving or dispersing components (A) and (B), as well as other components. Examples of aqueous media include water and organic solvents. Examples of organic solvents include lower alcohols such as ethanol and isopropyl alcohol; and low molecular weight diols and triols with 6 or fewer carbon atoms, such as 1,3-butylene glycol, glycerin, ethylene glycol, propylene glycol, and dipropylene glycol. Among these, water is preferred as the aqueous medium. The content of the aqueous medium in the aerosol concentrate is preferably 60% by mass or more, more preferably 70% by mass or more, preferably 98% by mass or less, and more preferably 96% by mass or less, from the viewpoint of dissolving or dispersing components (A) and (B), as well as other components, and improving foam discharge performance and foam quality.

[0039] <Ingredient (D): Nonionic surfactant> The aerosol concentrate constituting the aerosol composition of the present invention may further contain a nonionic surfactant as component (D) from the viewpoint of improving miscibility with carbon dioxide in the propellant (C). Examples of component (D) include polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene fatty acid esters, alkyl glucosides, alkyl alkanolamides, alkyl glyceryl ethers, higher fatty acid sucrose esters, polyglycerin fatty acid esters, polyoxyalkylene hydrogenated castor oil, alkyl saccharides, etc., and one or more of these can be used. The alkyl groups in polyoxyalkylene alkyl ethers, alkyl glucosides, alkyl alkanolamides, alkyl glyceryl ethers, and alkyl saccharides, the alkenyl groups in polyoxyalkylene alkenyl ethers, and the fatty acids in polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene fatty acid esters, higher fatty acid sucrose esters, and polyglycerin fatty acid esters preferably have 8 to 22 carbon atoms, more preferably 8 to 18 carbon atoms, and even more preferably 8 to 12 carbon atoms.

[0040] Among the above, the nonionic surfactant is preferably one or more selected from the group consisting of polyoxyalkylene alkyl ether, polyoxyalkylene alkenyl ether, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene fatty acid ester, alkyl glucoside, alkyl alkanolamide, alkyl glyceryl ether, and polyoxyalkylene hydrogenated castor oil, more preferably one or more selected from the group consisting of polyoxyalkylene alkyl ether, alkyl glucoside, alkyl alkanolamide, alkyl glyceryl ether, and polyoxyalkylene hydrogenated castor oil, and even more preferably alkyl glucoside.

[0041] Examples of polyoxyalkylene alkyl ethers include polyoxyethylene alkyl ethers or polyoxypropylene alkyl ethers having an alkyl group preferably with 8 to 22 carbon atoms, more preferably with 8 to 18 carbon atoms, and even more preferably with 8 to 12 carbon atoms. Specific examples include Kao Corporation's "Emulgen 103" (Laureth-3: PEG-3 lauryl ether), "Emulgen 116" (Laureth-16: PEG-16 lauryl ether), "Emulgen 306P" (Steareth-6: Polyoxyethylene (6) stearyl ether), and "Kaosofcare GP-1" (PPG-3 caprylyl ether). Examples of alkyl glucosides include alkyl glucosides having an alkyl group with 8 to 22 carbon atoms, more preferably 8 to 18 carbon atoms, and even more preferably 8 to 12 carbon atoms. Specific examples include "Mydol 10" (decyl glucoside) and "AG-124" (lauryl glucoside) manufactured by Kao Corporation. Examples of alkylalkanolamides include fatty acid ethanolamides or fatty acid diethanolamides having an acyl group with 8 to 22 carbon atoms, more preferably 8 to 18 carbon atoms, and even more preferably 8 to 12 carbon atoms. Specific examples include Kao Corporation's "Aminone PK-02S" (palm kernel oil fatty acid diethanolamide), "Aminone L-02" (lauric acid diethanolamide), and "Aminone C-11S" (coconut oil fatty acid N-methylethanolamide). Examples of alkylglyceryl ethers include alkylglyceryl ethers having an alkyl group with 8 to 22 carbon atoms, more preferably 8 to 18 carbon atoms, and even more preferably 8 to 12 carbon atoms. A specific example is "Penetol GE-ID" (isodecylglyceryl ether) manufactured by Kao Corporation. Examples of polyoxyalkylene hydrogenated castor oil include "Emanon CH-60K" (PEG-60 hydrogenated castor oil) manufactured by Kao Corporation.

[0042] When the aerosol concentrate contains component (D), from the viewpoint of improving the miscibility between the aerosol concentrate and carbon dioxide in the propellant (C), and from the viewpoint of using the aerosol composition in a hair cosmetic composition, the content of component (D) in the aerosol concentrate is preferably 0.001% by mass or more, more preferably 0.002% by mass or more, and even more preferably 0.003% by mass or more. From the viewpoint of improving storage stability, it is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, even more preferably 2.0% by mass or less, even more preferably 1.0% by mass or less, and even more preferably 0.5% by mass or less. The specific range of the content of component (D) in the aerosol concentrate is preferably 0.001 to 5.0% by mass, more preferably 0.002 to 3.0% by mass, even more preferably 0.003 to 2.0% by mass, even more preferably 0.003 to 1.0% by mass, and even more preferably 0.003 to 0.5% by mass.

[0043] Furthermore, from the viewpoint of improving the miscibility between the aerosol concentrate and the carbon dioxide in the propellant (C), it is preferable that the aerosol concentrate contains one or more components selected from the group consisting of components (A2) and (D).

[0044] <Ingredient (E): Nonionic polymer> The aerosol concentrate constituting the aerosol composition of the present invention may further contain a nonionic polymer as component (E) from the viewpoint of improving miscibility with carbon dioxide in the propellant (C). The weight-average molecular weight (Mw) of component (E) is preferably 10,000 or more, more preferably 50,000 or more, even more preferably 100,000 or more, even more preferably 200,000 or more, even more preferably 500,000 or more, and even more preferably 1,000,000 or more, from the viewpoint of improving foam discharge and foam quality, and improving miscibility with carbon dioxide in the propellant (C). Furthermore, from the viewpoint of improving storage stability, it is preferably 5,000,000 or less, more preferably 4,000,000 or less, and even more preferably 3,500,000 or less. The specific range of the weight-average molecular weight of component (E) is preferably 10,000 to 5,000,000, more preferably 50,000 to 5,000,000, even more preferably 100,000 to 4,000,000, even more preferably 200,000 to 4,000,000, even more preferably 500,000 to 3,500,000, and even more preferably 1,000,000 to 3,500,000. The weight-average molecular weight of component (E) can be measured, for example, by gel permeation chromatography (GPC) under the following conditions. Mobile layer: 50 mM LiBr, 1% CH3COOH / Ethanol:Water = 3:7 (w / w) Column: TSK gel α-M (manufactured by Tosoh Corporation) (2 in series) Standard substance: polyethylene glycol

[0045] Examples of nonionic polymers include water-soluble polysaccharides such as starch, cellulose, guar gum, tara gum, locust bean gum, and glucomannan; hydroxyalkylated water-soluble polysaccharides such as hydroxyethylcellulose and hydroxypropylcellulose; high-molecular-weight polyalkylene glycols such as high-molecular-weight polyethylene glycol and high-molecular-weight polyethylene glycol-polypropylene glycol copolymers; and polyvinyl alcohol. One or more of these can be used. Here, "high degree of polymerization" means that the weight-average molecular weight is preferably within the aforementioned range. Among the above, from the viewpoint of solubility in aerosol stock, improvement of foam discharge performance and foam quality, and improvement of miscibility with carbon dioxide in the propellant (C), the nonionic polymer is preferably one or more selected from the group consisting of water-soluble polysaccharides, hydroxyalkylated water-soluble polysaccharides, and high-molecular-weight polyalkylene glycols; more preferably one or more selected from the group consisting of starch, cellulose, guar gum, tara gum, locust bean gum, glucomannan, hydroxyethylcellulose, hydroxypropylcellulose, high-molecular-weight polyethylene glycol, and high-molecular-weight polyethylene glycol-polypropylene glycol copolymer. Even more preferably one or more selected from the group consisting of hydroxyethylcellulose, hydroxypropylcellulose, high-molecular-weight polyethylene glycol, and high-molecular-weight polyethylene glycol-polypropylene glycol copolymer. From the viewpoint of solubility in the aerosol concentrate, improvement of foam discharge performance and foam quality, and increased miscibility with carbon dioxide in the propellant (C), it is more preferable that component (E) contains one or more selected from the group consisting of hydroxyethylcellulose and high-molecular-weight polyethylene glycol.

[0046] If the aerosol concentrate contains component (E), the content of component (E) in the aerosol concentrate is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more, from the viewpoint of improving foam discharge performance and foam quality, and improving miscibility with carbon dioxide in the propellant (C). Furthermore, from the viewpoint of adjusting the aerosol concentrate to an appropriate viscosity and improving storage stability, it is preferably 5% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.5% by mass or less. The specific range of the content of component (E) in the aerosol concentrate is preferably 0.01 to 5% by mass, more preferably 0.05 to 2% by mass, even more preferably 0.1 to 1% by mass, and even more preferably 0.1 to 0.5% by mass.

[0047] <Other ingredients> The aerosol concentrate may contain other components as appropriate, as long as it does not impair the purpose of the present invention. Examples of such components include anionic surfactants, amphoteric surfactants, organic acids or their salts, aromatic ring-containing monoalcohols, antioxidants, oils other than component (B), polymers other than component (E), silicones, anti-dandruff agents, vitamins, bactericides, anti-inflammatory agents, preservatives, chelating agents, moisturizers, pearlescent agents, ceramides, fragrances, UV absorbers, pH adjusters, plant extracts, and the like, which are commonly used in cosmetics.

[0048] The aerosol stock solution constituting the aerosol composition of the present invention may contain branched-chain saturated higher alcohols as long as it does not impair the effects of the present invention, but from the viewpoint of improving storage stability, it is preferable that the content be low. Specifically, the content of branched-chain saturated higher alcohols in the aerosol stock solution is preferably less than 3% by mass, more preferably less than 2% by mass, even more preferably 1% by mass or less, even more preferably 0.5% by mass or less, even more preferably 0.1% by mass or less, and even more preferably 0% by mass.

[0049] The method for producing the aerosol concentrate is not particularly limited, and it can be produced by formulating and mixing component (A) and component (B), as well as other components used as necessary, using conventional methods.

[0050] <Ingredients (C): Propellant> The propellant (C) constituting the aerosol composition of the present invention contains carbon dioxide. The inclusion of carbon dioxide in component (C) enables the discharge of fine, dense foam. The carbon dioxide content in component (C) is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, and even more preferably 100% by mass, from the viewpoint of improving foam quality and improving the care effect on hair and scalp. In other words, it is preferable that the propellant (C) consists only of carbon dioxide. Component (C) may contain, as a propellant other than carbon dioxide, other liquefied gases such as nitrogen, propane, n-butane, isobutane and mixtures thereof, liquefied petroleum gas (LPG), dimethyl ether, isopentane, etc., to the extent that it does not impair the effects of the present invention.

[0051] The amount of propellant (C) in the aerosol composition of the present invention is preferably 0.5% by mass or more, more preferably 1% by mass or more, preferably 5% by mass or less, and more preferably 3% by mass or less, when the total amount of the aerosol concentrate and propellant (C) is 100% by mass, from the viewpoint of improving foam discharge performance and foam quality, and obtaining an appropriate spray speed. The specific range of the amount of propellant (C) when the total amount of the aerosol concentrate and propellant (C) is 100% by mass is preferably 0.5 to 5% by mass, and more preferably 1 to 3% by mass. Furthermore, in order to obtain an appropriate spray velocity, the internal pressure of the aerosol container after filling with propellant (C) is adjusted to preferably be 0.1 MPa or higher, more preferably 0.3 MPa or higher, preferably 1.3 MPa or lower, and more preferably 1.0 MPa or lower at 25°C. The specific range of the internal pressure of the aerosol container after filling with propellant (C) is preferably 0.1 to 1.3 MPa, more preferably 0.3 to 1.0 MPa.

[0052] <Aerosol container> The aerosol composition of the present invention is used by filling it into an aerosol container. Examples of such aerosol containers include known pressure-resistant containers made of metal, plastic, etc., and double-walled containers in which an inner bag is housed inside a pressure-resistant container. In the case of a double-walled container, it is preferable to fill the inner bag with the aerosol concentrate and fill the space between the pressure-resistant container and the inner bag with the propellant (C).

[0053] The method for preparing the aerosol composition of the present invention is not particularly limited. For example, it can be prepared by filling a pressure-resistant container that constitutes an aerosol container with the aerosol concentrate, attaching a valve, and then filling it with a propellant (C) from the valve portion.

[0054] <How to use aerosol compositions> The method of using the aerosol composition of the present invention is not particularly limited as long as it includes the step of dispensing the composition in a foamy form from an aerosol container and applying it to a target object. If the aerosol composition is a hair cosmetic composition, the method includes the step of dispensing the composition in a foamy form from an aerosol container and applying it to the hair. The foamed composition may be applied to wet hair or to dry hair, depending on the type of hair cosmetic composition. For example, if the aerosol composition of the present invention is a hair cleansing agent composition, the method may include the step of applying the hair cleansing agent composition, which is dispensed in a foamy form, to the hair and then washing the hair. The step of washing the hair may include the operation of foaming the hair cleansing agent composition on the hair and then rinsing off the hair cleansing agent composition. If the aerosol composition of the present invention is a hair cosmetic composition such as a rinse, conditioning agent, or treatment agent, one possible method is to apply the hair cosmetic composition, which is dispensed as a foam from an aerosol container, to hair that is wet or dry after washing, allow it to penetrate, and then rinse it off as needed. The foamy composition contains carbon dioxide, has good applicability, can be spread evenly over the entire surface of an object, and can be thoroughly absorbed. Therefore, by using the aerosol composition of the present invention on hair, for example, in the manner described above, the active ingredients can be easily penetrated into the hair.

[0055] When the aerosol composition is a hair cosmetic composition, the amount of the hair cosmetic composition applied to the hair is preferably 0.002 or more, more preferably 0.003 or more, and preferably 0.6 or less, and more preferably 0.5 or less, in terms of mass ratio to the mass of the hair (mass of hair cosmetic composition / mass of hair). The hair to be treated may be at least a portion of the scalp hair.

[0056] With regard to the embodiments described above, the present invention further discloses the following embodiments. <1> (A) Cationic surfactants, and (B) Straight-chain saturated higher alcohols It contains, Component (A) contains a monolong-chain alkyl cationic surfactant (A1), The content of component (A) is 0.9% by mass or more and less than 6.0% by mass, An aerosol composition comprising an aerosol concentrate having a molar ratio of component (B) to component (A1) [(B) / (A1)] of 3.0 or more and 7.0 or less, and a propellant (C) containing carbon dioxide. <2> Component (A1) is one or more selected from the group consisting of alkyltrimethylammonium salts (A1-1), alkoxyalkyltrimethylammonium salts (A1-2), alkylamidealkyltrimethylammonium salts (A1-3), alkyldimethylamine and its salts (A1-4), alkoxyalkyldimethylamine and its salts (A1-5), and alkylamidealkyldimethylamine and its salts (A1-6), preferably one or more selected from the group consisting of alkyldimethylamine and its salts (A1-4), alkoxyalkyldimethylamine and its salts (A1-5), and alkylamidealkyldimethylamine and its salts (A1-6), more preferably one or more selected from the group consisting of alkoxyalkyldimethylamine and its salts (A1-5) and alkylamidealkyldimethylamine and its salts (A1-6), and even more preferably one or more selected from the group consisting of N,N-dimethyl-3-octadecyloxypropylamine and dimethylaminopropyl stearate. <1> The aerosol composition described above. <3> The content of component (A1) in the aerosol concentrate is preferably 0.9 to 5.0% by mass, more preferably 0.9 to 5.0% by mass, even more preferably 0.9 to 4.0% by mass, even more preferably 0.9 to 3.5% by mass, even more preferably 0.9 to 3.0% by mass, even more preferably 0.9 to 2.5% by mass, even more preferably 1.0 to 2.5% by mass, even more preferably 1.2 to 2.5% by mass, and even more preferably 1.3 to 2.5% by mass. <1> or <2> The aerosol composition described above. <4> The content of component (A1) in component (A) is preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, even more preferably 80% by mass or more, and even more preferably 90% by mass or more, and 100% by mass or less. <1> ~ <3> The aerosol composition described in any one of the following: <5> Component (A) comprises one or more di-long-chain alkyl-type cationic surfactants (A2), preferably dialkyldimethylammonium salts, more preferably distearyldimethylammonium chloride and dialkyl(C12-18)dimethylammonium chloride. <1> ~ <4> The aerosol composition described in any one of the following: <6> The content of component (A2) in the aerosol concentrate is preferably 0.001 to 2.0% by mass, more preferably 0.001 to 1.5% by mass, even more preferably 0.001 to 1.0% by mass, even more preferably 0.005 to 1.0% by mass, even more preferably 0.01 to 1.0% by mass, even more preferably 0.01 to 0.5% by mass, and even more preferably 0.01 to 0.2% by mass. <5> The aerosol composition described above. <7> The content of component (A) in the aerosol concentrate is preferably 0.9 to 5.0% by mass, more preferably 0.9 to 4.0% by mass, even more preferably 0.9 to 3.5% by mass, even more preferably 1.0 to 3.5% by mass, even more preferably 1.2 to 3.5% by mass, and even more preferably 1.3 to 3.5% by mass. <1> ~ <6> The aerosol composition described in any one of the following: <8> Component (B) is one or more selected from the group consisting of lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, and behenyl alcohol, preferably one or more selected from the group consisting of lauryl alcohol, cetyl alcohol, and stearyl alcohol, more preferably one or more selected from the group consisting of cetyl alcohol and stearyl alcohol, and even more preferably stearyl alcohol. <1> ~ <7> The aerosol composition described in any one of the following: <9> The difference between the number of carbon atoms in the long-chain alkyl group in component (A1) and the number of carbon atoms in component (B) is preferably 6 or less, more preferably 4 or less, even more preferably 2 or less, and even more preferably 0. <1> ~ <8> The aerosol composition described in any one of the following: <10> The content of component (B) in the aerosol concentrate is preferably 1.5 to 32% by mass, more preferably 2.0 to 25% by mass, even more preferably 2.0 to 20% by mass, even more preferably 2.0 to 15% by mass, and even more preferably 2.5 to 10% by mass. <1> ~ <9> The aerosol composition described in any one of the following:

[0057] <11> The total content of component (A) and component (B) in the aerosol concentrate is preferably 1.5 to 32% by mass, more preferably 2.0 to 25% by mass, even more preferably 2.0 to 20% by mass, even more preferably 2.0 to 15% by mass, even more preferably 2.5 to 12% by mass, even more preferably 3.0 to 12% by mass, and even more preferably 4.0 to 12% by mass. <1> ~ <10> The aerosol composition described in any one of the following: <12> The molar ratio of component (B) to component (A1) in the aerosol concentrate [(B) / (A1)] is 3.0 or more and 7.0 or less, preferably 6.0 or less, more preferably 5.0 or less, and even more preferably 4.0 or less. <1> ~ <11> The aerosol composition described in any one of the following: <13> The molar ratio of component (B) to component (A) in the aerosol concentrate [(B) / (A)] is 7.0 or less, preferably 2.9 to 7.0, more preferably 3.0 to 7.0, even more preferably 3.0 to 5.0, and even more preferably 3.0 to 4.0. <1> ~ <12> The aerosol composition described in any one of the following: <14> The aerosol concentrate contains an aqueous medium, preferably 60% by mass or more, more preferably 70% by mass or more, preferably 98% by mass or less, and more preferably 96% by mass or less. <1> ~ <13> The aerosol composition described in any one of the following: <15> The aqueous medium is one or more selected from the group consisting of water, lower alcohols, low molecular weight diols and triols having 6 or fewer carbon atoms, preferably water, ethanol, isopropyl alcohol, 1,3-butylene glycol, glycerin, ethylene glycol, propylene glycol, and dipropylene glycol, more preferably water. <14> The aerosol composition described above. <16> Furthermore, component (D) contains one or more nonionic surfactants, preferably selected from the group consisting of polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene fatty acid esters, alkyl glucosides, alkyl alkanolamides, alkyl glyceryl ethers, and polyoxyalkylene hydrogenated castor oil; more preferably one or more selected from the group consisting of polyoxyalkylene alkyl ethers, alkyl glucosides, alkyl alkanolamides, alkyl glyceryl ethers, and polyoxyalkylene hydrogenated castor oil; even more preferably alkyl glucosides. <1> ~ <15> The aerosol composition described in any one of the following: <17> The alkyl glucoside is preferably an alkyl glucoside having an alkyl group with 8 to 22 carbon atoms, more preferably 8 to 18 carbon atoms, and even more preferably 8 to 12 carbon atoms. <16> The aerosol composition described above. <18> The content of component (D) in the aerosol concentrate is preferably 0.001 to 5.0% by mass, more preferably 0.002 to 3.0% by mass, even more preferably 0.003 to 2.0% by mass, even more preferably 0.003 to 1.0% by mass, and even more preferably 0.003 to 0.5% by mass. <16> or <17> The aerosol composition described above. <19> The aerosol concentrate contains one or more components selected from the group consisting of components (A2) and (D). <16> ~ <18> The aerosol composition described in any one of the following: <20> The aerosol concentrate further contains, as component (E), one or more selected from the group consisting of nonionic polymers, preferably water-soluble polysaccharides, hydroxyalkylated water-soluble polysaccharides, and high-molecular-weight polyalkylene glycols; more preferably, one or more selected from the group consisting of starch, cellulose, guar gum, tara gum, locust bean gum, glucomannan, hydroxyethylcellulose, hydroxypropylcellulose, high-molecular-weight polyethylene glycol, and high-molecular-weight polyethylene glycol-polypropylene glycol copolymers; even more preferably, one or more selected from the group consisting of hydroxyethylcellulose and high-molecular-weight polyethylene glycol. <1> ~ <19> The aerosol composition described in any one of the following:

[0058] <21> The weight-average molecular weight of component (E) is preferably 10,000 to 5,000,000, more preferably 50,000 to 5,000,000, even more preferably 100,000 to 4,000,000, even more preferably 200,000 to 4,000,000, even more preferably 500,000 to 3,500,000, and even more preferably 1,000,000 to 3,500,000. <20> The aerosol composition described above. <22> The content of component (E) in the aerosol concentrate is preferably 0.01 to 5% by mass, more preferably 0.05 to 2% by mass, even more preferably 0.1 to 1% by mass, and even more preferably 0.1 to 0.5% by mass. <20> or <21> The aerosol composition described above. <23> The content of branched-chain saturated higher alcohols in the aerosol concentrate is preferably less than 3% by mass, more preferably less than 2% by mass, even more preferably 1% by mass or less, even more preferably 0.5% by mass or less, even more preferably 0.1% by mass or less, and even more preferably 0% by mass. <1> ~ <22> The aerosol composition described in any one of the following: <24> The carbon dioxide content in component (C) is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, and even more preferably 100% by mass. <1> ~ <23> The aerosol composition described in any one of the following: <25> The amount of propellant (C) in the aerosol composition is preferably 0.5 to 5% by mass, and more preferably 1 to 3% by mass, when the total amount of the aerosol concentrate and propellant (C) is considered to be 100% by mass. <1> ~ <24> The aerosol composition described in any one of the following: <26> The aerosol composition is a hair cosmetic composition, preferably a hair cleanser, rinse, conditioning agent, treatment agent, styling agent, hair dye, or hair growth agent, more preferably a rinse, conditioning agent, treatment agent, or styling agent, and even more preferably a rinse, conditioning agent, or treatment agent. <1> ~ <25> The aerosol composition described in any one of the following: <27> The process involves dispensing a composition in a foamy form from an aerosol container and applying it to a target object. <1> ~ <26> A method of using the aerosol composition described in any one of the following. <28> (A) Cationic surfactants, and (B) Straight-chain saturated higher alcohols It contains, Component (A) contains a monolong-chain alkyl cationic surfactant (A1), The content of component (A) is 0.9% by mass or more and less than 6.0% by mass, Use as an aerosol concentrate of a composition in which the molar ratio of component (B) to component (A1) [(B) / (A1)] is 3.0 or more and 7.0 or less. <29> The aerosol concentrate is an aerosol concentrate of an aerosol composition containing a propellant (C) containing carbon dioxide. <28> Use as described above. [Examples]

[0059] The present invention will be described below with reference to examples, but the present invention is not limited to the scope of these examples.

[0060] Examples 1-14, Comparative Examples 1-3 (Preparation and Evaluation of Aerosol Conditioners) According to the composition shown in the table, each component to be added to the aerosol concentrate was mixed and then mixed until uniform to prepare the aerosol concentrate. Next, 50 g of the aerosol concentrate and the propellant (C) shown in the table were filled into a 100 mL transparent pressure-resistant container (manufactured by Toyo Seikan Co., Ltd.) in the mass ratio shown in the table to prepare the aerosol conditioner. The internal pressure of the aerosol container after filling with propellant was adjusted to a range of 0.55 to 0.85 MPa. The prepared aerosol conditioners were evaluated using the following method. The results are shown in the table. Note that the amounts listed in each table represent the amount of active ingredient (mass %) for each component.

[0061] (stability) Each example of aerosol conditioner, obtained by filling a transparent pressure-resistant container with the aerosol concentrate and propellant, was left to stand in an explosion-proof warehouse at 45°C. The contents of the pressure-resistant container were visually observed and evaluated according to the following three-stage evaluation criteria. [Evaluation Criteria] A: No separation or precipitation is observed after 90 days. B: No separation or precipitation is observed after 3 days, but separation or precipitation is observed within 90 days. C: Separation or precipitation may be observed within 3 days.

[0062] (Miscibility between aerosol concentrate and carbon dioxide) When filling a transparent pressure-resistant container with aerosol concentrate and propellant, the time it took to fill with the specified amount of carbon dioxide (2.2% by mass) was evaluated using the following four-level evaluation criteria. A shorter time to fill with the specified amount of carbon dioxide indicates higher miscibility between the aerosol concentrate and the carbon dioxide. [Evaluation Criteria] AA: The time required to fill with the specified amount of carbon dioxide is within 60 seconds. A: The time required to fill with the specified amount of carbon dioxide is 60 seconds or more and 120 seconds or less. B: The time required to fill with the specified amount of carbon dioxide is between 120 seconds and 180 seconds. C: The time required to fill with the specified amount of carbon dioxide is 180 seconds or more.

[0063] [Table 1]

[0064] [Table 2]

[0065] The ingredients used in the table are as follows: <Mono-long-chain alkyl cationic surfactant (A1)> • N,N-dimethyl-3-octadecyloxypropylamine; manufactured by Kao Corporation, "Farmin DM-E80", active ingredient amount 90% by mass • Dimethylaminopropyl stearate; manufactured by Nikko Chemicals Co., Ltd. as "NIKKOL Amidoamine MPS", active ingredient content 100% by mass <Dilong-chain alkyl-type cationic surfactant (A2)> • Dialkyl(C12-C18)dimethylammonium chloride; manufactured by Kao Corporation, "Cotamin D-2345P", active ingredient content 75% by mass <Linear saturated higher alcohols (B)> • Stearyl alcohol; manufactured by Kao Corporation, "Calcol 8098" • Cetyl alcohol; manufactured by Kao Corporation, "Calcol 6098" • C16-C18 straight-chain saturated higher alcohols; "Calcol 6870" manufactured by Kao Corporation. <Branched-chain saturated higher alcohols (B')> Isostearyl alcohol; manufactured by Higher Alcohol Industry Co., Ltd. <Nonionic surfactant (D)> • Lauryl glucoside; manufactured by Kao Corporation, "AG-124" <Other ingredients> Lactic acid; manufactured by PURAC Thailand Ltd., 90% lactic acid • Benzyl alcohol; manufactured by Valtris Specialty Chemicals (HQ) • Phenoxyethanol; manufactured by The Dow Chemical Company. • N,N-bis(3-methoxypropyl)isodocosanediamide; manufactured by Kao Corporation, "BRS661"

[0066] As shown in the table, all of the aerosol conditioners in this embodiment exhibit excellent storage stability when filled with a propellant containing carbon dioxide. In contrast, Comparative Example 1, in which the molar ratio [(B) / (A1)] in the aerosol stock solution was less than 3.0; Comparative Example 2, in which a portion of component (B) in the aerosol stock solution was replaced with a branched-chain saturated higher alcohol; and Comparative Example 3, in which the content of component (A) in the aerosol stock solution was less than 0.9% by mass, all showed poor storage stability.

[0067] (Example prescription 1) Aerosol conditioner <Composition of Aerosol Concentrate> (by mass) (A1) N,N-dimethyl-3-octadecyloxypropylamine (Kao Corporation's "Farmin DM-E80") 2.5 (B) Stearyl alcohol 7.5 (Kao Corporation's "Calcol 8098") (E) High-polymer polyethylene glycol 0.25 (Polyox WSR N-60K, manufactured by The Dow Chemical Company, weight-average molecular weight 2,000,000) Benzyl alcohol 0.3 (Made by Valtris Specialty Chemicals (HQ)) Phenoxyethanol 0.6 (Neolon PH100, manufactured by The Dow Chemical Company) Lactic acid 0.85 (PURAC Thailand Ltd. "90% Lactic Acid") Fragrance (appropriate amount) Purified water remaining amount Total 100.0

[0068] <Composition of Aerosol Conditioner> (by mass) Aerosol concentrate 97.8 (C) Carbon dioxide 2.2 Total 100.0

[0069] (Prescription Example 2) Aerosol Conditioner <Composition of Aerosol Concentrate> (by mass) (A1) N,N-dimethyl-3-octadecyloxypropylamine (Kao Corporation's "Farmin DM-E80") 0.9 (B) Stearyl alcohol 1.85 (Kao Corporation's "Calcol 8098") (E) High polymer polyethylene glycol 0.1 (Polyox WSR N-60K, manufactured by The Dow Chemical Company, weight-average molecular weight 2,000,000) (E) Hydroxyethylcellulose 0.1 (HEC Daicel SE850K manufactured by Daicel Finechem Co., Ltd., weight-average molecular weight 1,500,000) Benzyl alcohol 0.3 (Made by Valtris Specialty Chemicals (HQ)) Phenoxyethanol 0.6 (Neolon PH100, manufactured by The Dow Chemical Company) Lactic acid 0.85 (PURAC Thailand Ltd. "90% Lactic Acid") Fragrance (appropriate amount) Purified water remaining amount Total 100.0

[0070] <Composition of Aerosol Conditioner> (by mass) Aerosol concentrate 97.8 Carbon dioxide 2.2 Total 100.0 [Industrial applicability]

[0071] According to the present invention, it is possible to provide an aerosol composition that contains an aerosol concentrate containing a cationic surfactant and a higher alcohol at high concentrations, and a propellant containing carbon dioxide, and that has excellent storage stability and does not require shaking immediately before use.

Claims

1. (A) Cationic surfactants, and (B) Stearyl alcohol It contains, The component (A) comprises one or more monolong-chain alkyl cationic surfactants (A1) selected from the group consisting of N,N-dimethyl-3-octadecyloxypropylamine and dimethylaminopropyl stearate. The difference between the number of carbon atoms in the long-chain alkyl group in component (A1) and the number of carbon atoms in component (B) is 0. The content of component (A) is 0.9% by mass or more and less than 6.0% by mass, The content of component (B) is 2.5% by mass or more and 10% by mass or less. The content of component (A1) in component (A) is 90% by mass or more and 100% by mass or less. An aerosol composition comprising an aerosol concentrate having a molar ratio [(B) / (A1)] of component (A1) of component (B) to component (A1) of 3.0 or more and 4.0 or less, and a propellant (C) containing carbon dioxide.

2. The aerosol composition according to claim 1, wherein the component (A) comprises a di-long-chain alkyl type cationic surfactant (A2).

3. The aerosol composition according to claim 1 or 2, wherein the aerosol concentrate further contains a nonionic surfactant as component (D).

4. The aerosol composition according to any one of claims 1 to 3, wherein the aerosol concentrate further contains a nonionic polymer as component (E).

5. The aerosol composition according to any one of claims 1 to 4, wherein the carbon dioxide content in component (C) is 50% by mass or more.

6. An aerosol composition according to any one of claims 1 to 5, which is a hair cosmetic composition.

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