Aerosol composition and aerosol product

Abstract

To provide an aerosol composition which is excellent in stability in an aerosol container, has good foam retention after being sprayed to an object to be sprayed, and can prevent the occurrence of dripping of a discharged material.SOLUTION: An aerosol composition comprising a stock solution and a propellant, wherein a content of the propellant in the aerosol composition is 20 to 55% by mass, and the propellant comprises at least liquefied petroleum gas and dimethyl ether, the stock solution comprises water, a lower alcohol having 1 to 4 carbon atoms, and a higher alcohol having 16 to 20 carbon atoms and a melting point of 25 °C or higher, the content of the lower alcohol in the stock solution is from 50.0 to 85.0 mass%, the content of the higher alcohol in the stock solution is from 1.0 to 20.0 mass%, and the proportion of dimethyl ether to the liquefied petroleum gas in the propellant is from 0.6 to 3.5 by mass ratio.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to aerosol compositions and aerosol products. [Background technology]

[0002] Some disinfectants used for disinfecting hands and fingers contain lower alcohols such as ethanol. Aerosol formulations are available as such alcohol-containing disinfectants. Aerosol formulations can be produced by foaming an alcohol-containing aerosol composition using high-pressure gas. However, because alcohol has a defoaming effect, the higher the alcohol concentration, the shorter the duration of the foam after spraying, making it difficult to keep the foam on the fingers or other parts of the body for a long period of time.

[0003] Regarding alcohol-containing aerosols, Patent Document 1 discloses an invention aimed at providing an aerosol that does not require an emulsification operation during preparation and has a sustained cooling effect on the sprayed area. Patent Document 1 discloses that the above object can be achieved by an aerosol that consists of a concentrate containing a lower alcohol having 1 to 3 carbon atoms and a higher alcohol having 12 or more carbon atoms, and a propellant containing a liquefied gas, and that solidifies into a sherbet-like spray.

[0004] Patent Document 2 discloses an invention aimed at providing a cooling aerosol composition that, when sprayed, adheres to the application site in a frozen, snowy, or sherbet state, thereby providing a sufficiently good cooling effect and maintaining the cooling effect for a long period of time. Patent Document 2 discloses that the above object can be achieved by a cooling aerosol composition that comprises a concentrate containing 40.0 to 97.0 wt % of a monohydric lower alcohol and 3.0 to 15.0 wt % of a monohydric higher alcohol, and a propellant, and that, when sprayed in foam or mist, adheres to the application site in a frozen, snowy, or sherbet state due to the heat of vaporization of the propellant. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 9-221415 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-87017 Summary of the Invention [Problem to be solved by the invention]

[0006] The aerosol agents and aerosol compositions disclosed in Patent Documents 1 and 2 are both intended to provide a cooling sensation, but in some cases the cooling sensation is too strong for direct application to human skin. Furthermore, the aerosol agents and aerosol compositions disclosed in Patent Documents 1 and 2 do not pursue foam persistence after spraying. According to studies by the present inventors, the aerosol agents and aerosol compositions disclosed in Patent Documents 1 and 2 have yet to be improved in terms of the stability of the aerosol composition in an aerosol container and foam retention after spraying.

[0007] One aspect of the present disclosure is to provide an aerosol composition that has excellent stability within an aerosol container, has good foam retention after being sprayed onto an object to be sprayed, and can prevent the sprayed material from dripping. In addition, one aspect of the present disclosure is a method for spraying a content in an aerosol container onto an object to be sprayed. The present invention aims to provide an aerosol product that has excellent foam retention, can prevent dripping of the sprayed material, and can exhibit stable performance even after long-term storage. [Means for solving the problem]

[0008] The present disclosure includes the following aspects. [1] An aerosol composition comprising: The aerosol composition includes a concentrate and a propellant, the content of the propellant being 20% ​​by mass or more and 55% by mass or less, and the propellant includes at least liquefied petroleum gas and dimethyl ether. The stock solution is water, a lower alcohol having 1 to 4 carbon atoms, and containing a higher alcohol having 16 to 20 carbon atoms and a melting point of 25°C or higher; the content of the lower alcohol in the concentrate is 50.0% by mass or more and 85.0% by mass; the content of the higher alcohol in the stock solution is 1.0% by mass or more and 20.0% by mass or less, An aerosol composition, wherein the ratio of dimethyl ether to liquefied petroleum gas in the propellant is 0.6 or more and 3.5 or less in mass ratio. [2] The aerosol composition according to [1], wherein the lower alcohol is ethanol. [3] The aerosol composition according to [1] or [2], wherein the higher alcohol is at least one alcohol selected from the group consisting of stearyl alcohol and cetanol. [4] The aerosol composition according to any one of [1] to [3], further comprising at least one polyhydric alcohol selected from the group consisting of 1,3-butylene glycol and glycerin. [5] an aerosol container; a discharge device that discharges the contents filled in the aerosol container; and an aerosol composition filled in the aerosol container, wherein the aerosol composition is the aerosol composition according to any one of [1] to [4]. [6] an aerosol container; a discharge device that discharges the contents filled in the aerosol container; and an aerosol composition filled in the aerosol container, The aerosol composition comprises: A concentrate and a propellant, the propellant comprises at least liquefied petroleum gas and dimethyl ether; The stock solution is water, a lower alcohol having 1 to 4 carbon atoms, and containing a higher alcohol having 16 to 20 carbon atoms and a melting point of 25°C or higher; the content of the lower alcohol in the concentrate is 50.0% by mass or more, the content of the higher alcohol in the stock solution is 1.0% by mass or more and 20.0% by mass or less, The aerosol composition is contained in the aerosol container. the water, the lower alcohol, the higher alcohol, the liquefied petroleum gas, and the dimethyl ether are dissolved to form an aerosol composition; The aerosol composition is sprayed from the aerosol container, and the liquefied petroleum gas and dimethyl ether volatilize from the aerosol composition, thereby precipitating at least a portion of the higher alcohol dissolved in the aerosol composition. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, an aerosol composition can be obtained that has excellent stability within an aerosol container, good foam retention after being sprayed onto an object to be sprayed, and can prevent the ejected material from dripping. Furthermore, according to one aspect of the present disclosure, an aerosol product can be obtained that has excellent foam retention when the aerosol composition in the aerosol container is sprayed onto an object to be sprayed, can prevent the discharged material from dripping, and can exhibit stable performance even after long-term storage. DETAILED DESCRIPTION OF THE INVENTION

[0010] Unless otherwise specified, the expressions "XX to YY" or "XX to YY" representing a numerical range mean a numerical range including the lower and upper limits, which are the endpoints. When a numerical range is described in stages, the upper and lower limits of each numerical range can be combined in any way. In the present disclosure, for example, a description such as "at least one selected from the group consisting of XX, YY, and ZZ" means any of XX, YY, ZZ, a combination of XX and YY, a combination of XX and ZZ, a combination of YY and ZZ, or a combination of XX, YY, and ZZ.

[0011] An aerosol composition according to one embodiment of the present disclosure comprises a concentrate and a propellant. The content of the propellant in the entire aerosol composition is 20% by mass or more and 55% by mass or less, and the propellant includes at least liquefied petroleum gas and dimethyl ether. The concentrate contains water, a lower alcohol having 1 to 4 carbon atoms, and a higher alcohol having 16 to 20 carbon atoms and a melting point of 25°C or higher. The content of the lower alcohol in the concentrate is 50.0% by mass to 85.0% by mass, and the content of the higher alcohol in the concentrate is 1.0% by mass to 20.0% by mass. Furthermore, the ratio of dimethyl ether to liquefied petroleum gas in the propellant is 0.6 to 3.5 by mass.

[0012] As described above, aerosol compositions containing a high concentration of a lower alcohol having 1 to 4 carbon atoms have a strong defoaming effect of the lower alcohol, and therefore the foam does not last long after being sprayed onto an object to be sprayed, which can lead to problems such as dripping. Therefore, the present inventors have conducted extensive research to obtain an aerosol composition that can maintain a high concentration of lower alcohol in the concentrate of 50.0% by mass or more, while prolonging the duration of the foam on the target object and preventing dripping. As a result, they have found that the above aerosol composition can effectively achieve the above objective.

[0013] The reason why the aerosol composition according to this embodiment has excellent foam maintenance properties is thought to be due to the following mechanism.

[0014] First, the content of lower alcohols having 1 to 4 carbon atoms (hereinafter simply referred to as "lower alcohols") in the concentrate according to the present disclosure is 50.0% by mass or more based on the concentrate. By including lower alcohols at such a high concentration, the concentrate can have excellent disinfecting ability. Furthermore, the content of lower alcohols in the concentrate is 85.0% by mass or less. By setting the upper limit of the content of lower alcohols with strong defoaming properties in the concentrate to 85.0% by mass, the effects of extending the duration of foam retention of an aerosol composition using the concentrate and preventing dripping can be more reliably achieved. In addition, the content of higher alcohols having 16 to 20 carbon atoms and a melting point of 25°C or higher (hereinafter simply referred to as "higher alcohols") in the raw solution is 1.0% by mass or more and 20.0% by mass or less, based on the raw solution. When the content of higher alcohols in the raw solution is within the above range, the raw solution has a water content of at least 1.0% by mass at room temperature (25°C). The amount of the solubility of the solubility agent in the aqueous solution may be too large to form a completely homogeneous system.

[0015] On the other hand, the aerosol composition according to the present disclosure contains a propellant in a ratio of 20% by mass or more and 55% by mass or less relative to the total aerosol composition, and the propellant contains liquefied petroleum gas (hereinafter also referred to as "LPG") and dimethyl ether (hereinafter also referred to as "DME") in a specific mass ratio. When such a specific propellant is filled into a container in a specific ratio together with the concentrate, the higher alcohol, which was at least partially insoluble in the concentrate state, dissolves in the water in the concentrate together with the lower alcohol, LPG, and DME, resulting in an aerosol composition that is less likely to precipitate and / or separate from the higher alcohol, etc., even when stored at low temperatures. When such an aerosol composition is sprayed from an aerosol container into the atmosphere, the propellant evaporates, causing the concentrate to foam and adhere to the object, forming a foam of the lower alcohol in the concentrate on the object. Furthermore, due to the evaporation of the propellant (LPG, DME) from the aerosol composition, at least a portion of the higher alcohol dissolved in the aerosol composition in the aerosol container becomes insoluble in the concentrate and precipitates on the surface of the lower alcohol foam. As a result, the lower alcohol foam is protected by the higher alcohol precipitated on its surface, which is thought to stabilize the lower alcohol foam.

[0016] [Undiluted solution] <Lower alcohol> The lower alcohol having 1 to 4 carbon atoms, which is one essential component of the raw solution, can be, for example, a monohydric aliphatic alcohol having 1 to 4 carbon atoms. Specific examples include methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, isobutyl alcohol (2-methylpropyl alcohol), normal butyl alcohol (1-butanol), 2-butanol, isobutyl alcohol (2-methyl-1-propanol), and tert-butyl alcohol (2-methyl-2-propanol). The lower alcohol is preferably an aliphatic alcohol having 1 to 3 carbon atoms because of its high water solubility, and among them, at least one alcohol selected from the group consisting of ethyl alcohol and isopropyl alcohol is particularly preferred. Furthermore, ethyl alcohol is particularly preferred because it is easily available and has excellent bactericidal power and safety. The concentrate may contain one or more lower alcohols.

[0017] The content ratio of the lower alcohol in the stock solution is 50.0% by mass or more, particularly preferably 60.0% by mass or more, and even more preferably 70.0% by mass or more, based on the stock solution. Furthermore, this content ratio is 85.0% by mass or less, particularly preferably 80.0% by mass or less. That is, the content ratio of the lower alcohol in the stock solution ranges from 50.0% by mass to 85.0% by mass or less, particularly preferably 60.0% by mass to 80.0% by mass or less, and even more preferably 70.0% by mass to 80.0% by mass or less. When the stock solution contains two or more lower alcohols, the above content ratio refers to the total content ratio of the two or more lower alcohols. By setting the blending ratio of the lower alcohol in the concentrate within the above range, a uniform aerosol composition can be formed together with the higher alcohol in cooperation with the propellant. Furthermore, when the concentrate is sprayed from the aerosol container, it can be made into a good foam. Furthermore, the concentrate can be provided with excellent disinfecting ability.

[0018] <Higher alcohol> The higher alcohol, another essential component of the raw solution, is a higher alcohol having 16 to 20 carbon atoms and a melting point of 25°C or higher. Examples of such higher alcohols include: For example, it can be a monohydric aliphatic alcohol having 16 to 20 carbon atoms and a melting point of 25° C. or higher. Specific examples include cetanol (C16, melting point 49.3° C.) and stearyl alcohol (C18, melting point 57.9° C.). The concentrate can contain one or more higher alcohols. Although oleyl alcohol is a monohydric aliphatic alcohol with 18 carbon atoms, it is not included in the essential higher alcohols because it has a low melting point of approximately 7°C.

[0019] The content ratio of the higher alcohol in the concentrate is preferably 1.0% by mass or more and 20.0% by mass or less, particularly preferably 2.0% by mass or more and 15.0% by mass or less, based on the concentrate. When the concentrate contains two or more higher alcohols, the above content ratio refers to the total content ratio of the two or more higher alcohols. By setting the content ratio of the higher alcohol in the concentrate within the above range, a portion of the higher alcohol can be left undissolved in the concentrate. Meanwhile, in the aerosol composition, a uniform aerosol composition can be obtained through cooperation between the lower alcohol and the propellant (LPG and DME). When the aerosol composition is ejected from an aerosol container, at least a portion of the higher alcohol dissolved in the aerosol composition precipitates on the surface of the lower alcohol foam due to the evaporation of the propellant. As a result, the lower alcohol foam can be stabilized, improving foam retention on objects such as hands.

[0020] In addition to the above-mentioned higher alcohols as essential components, the concentrate may further contain higher alcohols having 6 to 15 carbon atoms, or higher alcohols having 16 or more carbon atoms but a melting point of less than 25° C., within the scope of the present invention. Examples of such alcohols include lauryl alcohol (12 carbon atoms) and oleyl alcohol (18 carbon atoms, melting point 7° C.).

[0021] <Water> Water, which is another essential component in the stock solution, is not particularly limited, and for example, purified water or ion-exchanged water can be used. The content ratio of water in the stock solution is not particularly limited, but is preferably, for example, 5.0% by mass or more and 49.0% by mass or less, and particularly preferably 7.0% by mass or more and 40.0% by mass or less. By setting the content ratio of water to the concentrate within the above range, at least a portion of the higher alcohol is likely to remain undissolved in the concentrate at room temperature, while when the concentrate is prepared into an aerosol composition, the higher alcohol can be easily dissolved uniformly in cooperation with the propellant (LPG and DME) and the lower alcohol.

[0022] <Other ingredients> As optional components (other components) that can be blended into the concentrate, various compounds or mixtures can be used in an appropriate form depending on the intended use of the aerosol composition. Examples of active ingredients or additives include surfactants, moisturizers, anti-inflammatory analgesics, antipruritics, antifungal agents, bactericides, antisuppurative agents, cooling agents, antioxidants, solubilizers, fragrances, dyes, etc. These substances can be used alone or in combination of two or more. Specific examples of active ingredients or additives include moisturizers such as polyhydric alcohols such as glycerin and 1,3-butylene glycol. Specific examples of other active ingredients / additives include indomethacin, L-menthol, diethyltoluamide, camphor, crotamiton, methyl salicylate, tocopherol acetate, pantothenyl ethyl ether, cetyl isooctanoate, aloe extract, salicylic acid monoglyceride, thymolic acid, diphenhydramine hydrochloride, chlorpheniramine, undecylenic acid, pentachlorphenol, trichomycin, potassium iodide, benzalkonium chloride, penicillin V, tetracycline hydrochloride, fradiomycin, kanamycin, peppermint oil, and diisostearate. Propylene glycol, propylene glycol, polyvinyl alcohol, isopropyl myristate, and others. As the surfactant, various surfactants can be blended within the range that does not impair the function of the present invention. Examples of surfactants that can be blended include cationic surfactants and anionic surfactants, specifically benzalkonium chloride and sodium laureth sulfate. When a surfactant is used, the content of the surfactant in the concentrate is preferably 5.0% by mass or less, particularly 4.0% by mass or less, so as not to inhibit the stabilization of the foam by adding the surfactant to the concentrate, i.e., to prevent the foam from becoming unstable. It is more preferable to set the content at 3.0 mass % or less.

[0023] [Propellant] The propellant includes LPG and DME. By using at least LPG and DME in combination, a concentrate containing a higher alcohol in an amount exceeding the saturated solubility in a mixed solvent of water and a lower alcohol can be stably converted into a homogeneous aerosol composition in an aerosol container. That is, when LPG alone is used as the propellant, the low-temperature stability is poor, and when DME alone is used as the propellant, the foam-forming ability and low-temperature stability of the aerosol composition are poor.

[0024] The ratio (mass ratio) of LPG to DME in the propellant is 0.6 to 3.5, preferably 1.0 to 2.0, by mass. By ensuring that the ratio (mass ratio) of LPG to DME in the propellant is within this range, the lower alcohol can be stably foamed when the aerosol composition is discharged from an aerosol container, and the foam formed from the lower alcohol can be prevented from defoaming, allowing the foam to be maintained for a longer period of time. This also contributes to further improving the stability of the aerosol composition (preventing precipitation of the higher alcohol and separation of the propellant).

[0025] [Propellant content in aerosol composition] In the aerosol composition according to this embodiment, the blending ratio of the propellant to the concentrate is 20% by mass or more and 55% by mass or less, based on the total aerosol composition. This blending ratio is particularly preferably 25 to 50% by mass. By maintaining this blending ratio within the above range, sufficient stabilization of the aerosol composition, more reliable foaming of the lower alcohol, and more reliable precipitation of the higher alcohol can be achieved. By reducing the blending ratio of the propellant, it is possible to avoid the discharged material adhering to the application site in a frozen, snowy, or sherbet state due to the heat of vaporization of the propellant, as intended in Patent Documents 1 and 2. That is, if the discharged material adhering to a relatively high temperature application site, such as human skin, in a frozen, snowy, or sherbet state, although it does provide a cooling effect, the foam quickly melts at the application site, making it difficult to maintain the foam for a long period of time. In contrast, in the present disclosure, it is possible to precipitate a higher alcohol on a foam of a lower alcohol without using the cooling effect of the concentrate due to the heat of vaporization of the propellant. Therefore, even when sprayed onto human skin, the foam can be maintained for a relatively long time.

[0026] In addition to the propellant as an essential component described above, the aerosol composition may contain other propellants within the scope of the present invention. Examples of other propellants include compressed gases such as air, nitrogen (N2), carbon dioxide (CO2), and nitrous oxide.

[0027] <Aerosol products> Next, aerosol products will be described. An aerosol product has a container filled with an aerosol composition as its contents, and a discharge mechanism provided in the container for discharging the contents. The container and the discharging mechanism are not particularly limited, and known ones can be used. The container may be any container that can withstand the pressure of the propellant, and known containers made of resin, metal, glass, etc. may be used.

[0028] The ejection mechanism of the aerosol product is not particularly limited, and any known mechanism capable of ejecting a foam, jet, or mist may be used, including those with a spout-shaped, straight-shaped, or mechanical breakup-shaped nozzle.

[0029] The pressure (gauge pressure) inside the container of an aerosol product is not particularly limited. The propellant may be filled so that the pressure (gauge pressure) inside the container when filled into the aerosol container is, for example, 1 MPa or less at 25°C.

[0030] Furthermore, the aerosol compositions and aerosol products can be used for a variety of purposes, such as for personal use, for home use, and for industrial use. For human use, examples include body lotions, skin care agents, hair growth agents, cleansing agents, massage agents, hair styling agents, hair treatment agents, shampoos, conditioners, makeup cosmetics, repellents, sunscreens, etc. For household use, examples include cleaning agents, deodorants, air fresheners, disinfectants, insecticides, insect repellents, waterproofing agents, and water repellents. Industrial applications include lubricants, coating agents, adhesives, paints, etc. Among these, it can be suitably used in disinfectants and dry shampoos. [Example]

[0031] The aerosol composition according to the present disclosure will be described in more detail below using examples. Note that the aerosol composition according to the present disclosure is not limited to the configurations embodied in the following examples. In addition, in the examples, the blending ratios are by mass unless otherwise specified.

[0032] <Examples 1 to 14> The lower alcohol, higher alcohol, water, and other ingredients shown in Table 1 were mixed and stirred at room temperature (25°C). Specifically, all of the ingredients constituting the stock solution were placed in a 200 ml beaker and stirred at 500 rpm for 10 minutes using a magnetic stirrer. The resulting stock solution was subjected to the evaluation (5) described below. Next, all of the components shown in Table 1 except for the higher alcohol were placed in a glass pressure bottle (aerosol container, capacity 100 mL) and stirred and mixed. The higher alcohol was then added, and an aerosol valve was then attached to the glass pressure bottle. Next, the propellant was filled into the glass pressure bottle. The glass pressure bottle with the attached aerosol valve was then shaken by hand until the higher alcohol was dissolved, producing an aerosol product (aerosol composition). The shaking was performed at a distance of 20 cm and 120 times per minute. Table 1 shows the blending ratios of the lower alcohol, higher alcohol, water, and other components that make up the concentrate, the blending ratio of the concentrate to the propellant, and the blending ratios of LPG and DME used as the propellant.

[0033] <Comparative Examples 1 to 16> The preparation of the concentrate and the production of the aerosol product (aerosol composition) were carried out in the same manner as in Examples 1 to 14, except that the lower alcohol, higher alcohol, water, and other ingredients shown in Table 2 were used in the blending ratios shown in Table 2.

[0034] <Evaluation> (1) Stability of the aerosol composition The glass pressure bottle filled with the aerosol composition was left to stand for one day in an environment at a temperature of 5°C. The state of the aerosol composition was then visually observed and evaluated according to the following criteria. In this evaluation, rank A was considered to be acceptable. Rank A: No precipitation of higher alcohol or separation of propellant is observed. Rank B: Precipitation of higher alcohol is observed. Rank C: Separation of propellant observed.

[0035] (2) Foam forming ability After adjusting the temperature of the aerosol composition in the aerosol container to 25°C, 0.5 g of the aerosol composition was discharged from the aerosol container onto the palm of a hand, and the time during which the foam form was maintained was measured and evaluated according to the following criteria. In this evaluation, a rank of B or higher was considered to be acceptable. Rank A: Maintains a foamy form for more than 60 seconds. Rank B: Maintains a foamy form for 30 to 60 seconds. Rank C: The foam shape disintegrates in less than 30 seconds. Rank D: No foam is formed.

[0036] (3) Degree of dripping The temperature of the aerosol composition in the aerosol container was adjusted to 25°C, and then 0.5 g of the aerosol composition was dispensed from the aerosol container onto the palm of a hand. The palm was held at an angle of 45° to the horizontal, and the time required for the aerosol composition to move 30 mm on the palm was measured. The measurement results were evaluated according to the following criteria. In this evaluation, a rank of B or higher was considered to be acceptable. Rank A: 15 seconds or more Rank B: 5 seconds or more but less than 15 seconds Rank C: Less than 5 seconds Rank D: No foam formation

[0037] (4) Temperature of the discharged material The aerosol composition in the aerosol container was adjusted to a temperature of 25°C, and then discharged onto the surface of a glass plate whose temperature had been adjusted to 25°C. The temperature of the deposit on the glass plate was measured for 30 seconds using a thermocouple, and the minimum temperature measured was evaluated according to the following criteria. A rank of B or higher was considered to be acceptable. Rank A: Minimum temperature is 15°C or higher Rank B: Minimum temperature is between 10°C and 15°C Rank C: Minimum temperature is less than 10°C

[0038] (5) Presence or absence of precipitation of higher alcohol in the undiluted solution 100 ml of the stock solution prepared in a beaker was left to stand for 12 hours under normal pressure at a temperature of 25°C. The stock solution was then visually checked for the presence or absence of undissolved higher alcohol, and evaluated according to the following criteria. Rank A: Higher alcohol was confirmed to be undissolved in the original solution. Rank B: No undissolved higher alcohol was found in the original solution.

[0039] For Examples 1 to 14 and Comparative Examples 1 to 16, the results of the above evaluations (1) to (5) are shown in Tables 3 and 4.

[0040] [Table 1]

[0041] [Table 2]

[0042] [Table 3]

[0043] [Table 4]

[0044] As shown in Table 3, the aerosol compositions of Examples 1 to 14 were excellent in stability as aerosol compositions, exhibited high foam-forming ability, and the formed foam was maintained for a long period of time, resulting in the composition remaining at the ejected position for a long period of time. Furthermore, because the temperature of the ejected product did not become too low, it was possible to prevent an excessively cold sensation, for example, when applied to the skin. It should be noted that, from the results of Evaluations (1) and (5), it was found that, although at least a portion of the higher alcohol was undissolved in the concentrate of the aerosol composition of each Example, by combining such concentrate with propellants (DME and LPG) to form an aerosol composition, the higher alcohol was dissolved in the aerosol composition.

[0045] On the other hand, the evaluation results of Comparative Examples 1 to 16 are as shown in Table 4. That is, Comparative Example 1 had low foam-forming ability and a low dripping rating, which is thought to be due to the fact that the propellant in the aerosol composition was composed solely of DME, which has strong defoaming properties. Comparative Example 2 was excellent in foam-forming ability and dripping evaluation. This is thought to be because the propellant in the aerosol composition was composed solely of LPG. On the other hand, the stability of the aerosol composition was poor. This is thought to be because LPG has a lower ability as a solvent for higher alcohols than DME.

[0046] The stability of the aerosol composition of Comparative Example 3 was very low, which is thought to be due to the low ratio of DME to LPG in the propellant in the aerosol composition. Comparative Example 4 had good stability as an aerosol composition, but the foam-forming ability and dripping evaluation were low due to the defoaming effect of DME. This is thought to be due to the high ratio of DME to LPG in the propellant. The stability evaluation of the aerosol composition of Comparative Example 5 was low, which is thought to be because the content of the propellant in the aerosol composition was low, resulting in insufficient dissolution stability of cetanol in the aerosol composition. Comparative Example 6 had low foam-forming ability and drooling ratings, which is thought to be due to the high content of propellant in the aerosol composition. In Comparative Example 7, the results of the foam-forming ability and dripping evaluation were good, but the stability of the aerosol composition was low. This is thought to be due to the fact that the higher alcohol contained in the concentrate was behenyl alcohol, an aliphatic alcohol with 22 carbon atoms.

[0047] The results of the foam forming ability and dripping evaluation were extremely low in Comparative Example 8. This is thought to be because the higher alcohol contained in the stock solution was lauryl alcohol, an aliphatic alcohol with 12 carbon atoms and a low melting point, and therefore did not precipitate sufficiently on the surface of the ethanol foam. The results of the foam-forming ability and dripping evaluation for Comparative Example 9 were extremely low. This is thought to be because the higher alcohol contained in the concentrate was oleyl alcohol, which is liquid at room temperature (25°C). Therefore, even after the aerosol composition was ejected, oleyl alcohol did not precipitate on the foam of the lower alcohol. Comparative Example 10 had extremely poor results in the foam forming ability and dripping evaluation. This is thought to be due to the high ethanol content of the concentrate, at 90.0% by mass. do.

[0048] In Comparative Example 11, the stability of the aerosol composition was extremely low, and the results of the foam-forming ability and dripping evaluation were also low. This is thought to be because the concentrate did not contain a higher alcohol, and the foam-forming ability was insufficient with only the silicone surfactant. Comparative Example 12 corresponds to Example 1 of Patent Document 1, and the results of the foam-forming ability and dripping evaluation were extremely low. This is thought to be because the concentrate did not contain water and consisted only of ethanol and stearyl alcohol, and the ratio of DME to LPG in the propellant was extremely high, resulting in a strong defoaming effect of DME. Comparative Example 13 corresponds to Example 2 of Patent Document 2, and the results of the foam-forming ability and dripping evaluation were extremely low. This is thought to be because the propellant consisted only of DME, which has a high defoaming ability. Comparative Example 14 corresponds to Example 4 of Patent Document 2, and the results of the foam-forming ability and dripping evaluation were low. This is thought to be because the propellant consisted only of DME, which has high defoaming ability.

[0049] The aerosol composition of Comparative Example 15 had poor stability, which is thought to be because the content of cetanol in the concentrate was as high as 25.0% by mass, causing precipitation in a low-temperature environment. Comparative Example 16 corresponds to Example 6 of Patent Document 2, and the results of the foam-forming ability and dripping evaluation were low. This is thought to be due to the propellant content being as high as 60% relative to the aerosol composition, resulting in a strong defoaming effect of the propellant.

Claims

1. 1. An aerosol composition comprising: A concentrate and a propellant, the content of the propellant in the aerosol composition is 20% by mass or more and 55% by mass or less; the propellant comprises at least liquefied petroleum gas and dimethyl ether; The stock solution is water, a lower alcohol having 1 to 4 carbon atoms, and containing a higher alcohol having 16 to 20 carbon atoms and a melting point of 25°C or higher; the content of the lower alcohol in the raw solution is 50.0% by mass or more and 85.0% by mass or less, the content of the higher alcohol in the stock solution is 1.0% by mass or more and 20.0% by mass or less, An aerosol composition, wherein the ratio of dimethyl ether to liquefied petroleum gas in the propellant is 0.6 or more and 3.5 or less in mass ratio.

2. 2. The aerosol composition of claim 1, wherein the lower alcohol is ethanol.

3. The higher alcohol is at least one alcohol selected from the group consisting of stearyl alcohol and cetanol.

10. The aerosol composition of claim 1.

4. 10. The aerosol composition of claim 1, further comprising at least one polyhydric alcohol selected from the group consisting of 1,3-butylene glycol and glycerin.

5. an aerosol container; a discharge device that discharges the contents filled in the aerosol container; and an aerosol composition filled in the aerosol container, wherein the aerosol composition is the aerosol composition according to any one of claims 1 to 4.

6. an aerosol container; a discharge device that discharges the contents filled in the aerosol container; and an aerosol composition filled in the aerosol container, The aerosol composition comprises: A concentrate and a propellant, the propellant comprises at least liquefied petroleum gas and dimethyl ether; The stock solution is water, a lower alcohol having 1 to 4 carbon atoms, and containing a higher alcohol having 16 to 20 carbon atoms and a melting point of 25°C or higher; the content of the lower alcohol in the raw solution is 50.0% by mass or more, the content of the higher alcohol in the stock solution is 1.0% by mass or more and 20.0% by mass or less, The aerosol composition is contained in the aerosol container. the water, the lower alcohol, the higher alcohol, the liquefied petroleum gas, and the dimethyl ether are dissolved to form an aerosol composition; The aerosol composition is sprayed from the aerosol container, and An aerosol product in which the liquefied petroleum gas and dimethyl ether volatilize, causing at least a portion of the higher alcohol dissolved in the aerosol composition to precipitate.

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