JP7645531B2 - Foamable aerosol composition - Google Patents

Description

The present invention relates to a foamable aerosol composition. More specifically, the present invention relates to a foamable aerosol composition that contains a large amount of an oily base, has excellent stability of the aerosol composition, and foamability of the discharged product, and is easy to obtain the effects of the oily base.

Conventionally, aerosol compositions that form foam-like ejections have been developed. Patent Document 1 discloses an oily foam aerosol composition that contains fats and oils, a polyoxyethylene-added nonionic surfactant, and an alkyl phosphate derivative and/or a sulfosuccinate. Patent Document 2 discloses a foam aerosol composition that contains a polyoxyethylene alkyl ether, an oily component, and water.

JP 2004-75589 A JP 2001-2526 A

However, the oily foam aerosol composition described in Patent Document 1 only maintains a foamy state for a short period of time, and does not produce a stable discharge. In addition, the aerosol composition described in Patent Document 2 contains about half water, making it difficult to mix with other oily ingredients, such as those used to float dirt.

The present invention was made in consideration of such conventional problems, and aims to provide a foamable aerosol composition that contains a large amount of oily base, has excellent aerosol composition stability and foamability of the discharged product, and is easy to obtain the effects of the oily base.

The present invention, which solves the above problems, mainly includes the following configurations:

(1) A foamable aerosol composition comprising an oil concentrate and a propellant, the oil concentrate containing an oil base and a surfactant, the oil base containing 70% by mass or more of a hydrocarbon oil in the oil base, and the surfactant containing a polyoxyethylene alkyl ether having an HLB of 15 to 20 and a nonionic surfactant having an HLB of 10 or less.

According to this configuration, the foamable aerosol composition is composed of an oil concentrate and a propellant, the oil concentrate contains an oil base and a surfactant, and the oil base contains 70% by mass or more of hydrocarbon oil in the oil base. Therefore, the foamable aerosol composition is likely to obtain the effects of the hydrocarbon oil, such as a cleaning effect for cleaning oily stains and a lubricating effect. In addition, the foamable aerosol composition contains a polyoxyethylene alkyl ether with an HLB of 15 to 20 and a nonionic surfactant with an HLB of 10 or less. As a result, the foamable aerosol composition has excellent aerosol composition stability and foamability of the ejected product, is easily attached to the object to be sprayed, and is likely to obtain the effects of the hydrocarbon oil described above.

(2) The foamable aerosol composition according to (1), wherein the nonionic surfactant having an HLB of 10 or less is at least one selected from the group consisting of polyglycerin fatty acid esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene glycerin fatty acid esters, sorbitan fatty acid esters, and polyoxyethylene sorbit fatty acid esters.

With this configuration, the foamable aerosol composition is easily homogenized with the oil base and the polyoxyethylene alkyl ether having an HLB of 15 to 20, the stability of the aerosol composition at low temperatures is superior, and the foamability of the discharged product is more stable.

(3) The foamable aerosol composition according to (1) or (2), in which the surfactant content in the oil-based concentrate is 3 to 30% by mass.

This configuration makes it easier to obtain a more stable foam from the foamable aerosol composition.

(4) The foamable aerosol composition according to any one of (1) to (3), wherein the content ratio of the polyoxyethylene alkyl ether to the nonionic surfactant is 5:3 to 1:4.

This configuration makes it easier for the foamable aerosol composition to have a uniform composition and foam more stably.

(5) The foamable aerosol composition according to any one of (1) to (4), wherein the propellant contains a compressed gas.

With this configuration, the foamable aerosol composition is less susceptible to temperature changes during use and is easily ejected in a stable foam form.

The present invention provides a foamable aerosol composition that contains a large amount of oily base, has excellent stability of the aerosol composition, and foamability of the discharged product, making it easy to obtain the effects of the oily base.

[Foamable aerosol composition]
A foamable aerosol composition (hereinafter also referred to as an aerosol composition) according to one embodiment of the present invention comprises an oily concentrate and a propellant. The oily concentrate contains an oily base and a surfactant. The oily base contains 70% by mass or more of a hydrocarbon oil in the oily base, and the surfactant contains a polyoxyethylene alkyl ether having an HLB of 15 to 20 and a nonionic surfactant having an HLB of 10 or less. Each of these will be described below.

(Oily based concentrate)
The oil-based concentrate contains an oil base and a surfactant.

Oily Base The oily base is blended as a solvent for the aerosol composition, and cleans oily dirt and imparts a lubricating effect. The oily base contains 70% by mass or more of a hydrocarbon oil in the oily base. The oily base may contain other oily components in addition to the hydrocarbon oil. The other oily components are, for example, silicone, ester oil, oils and fats, higher fatty acids, wax, higher alcohols, etc. The oily base does not contain water.

The hydrocarbon oil is not particularly limited. For example, the hydrocarbon oil may be a mixture of naphthenic hydrocarbons, normal paraffinic hydrocarbons, isoparaffinic hydrocarbons, aromatic hydrocarbons, kerosene, mineral spirits, or the like, which is liquid at 25°C.

The silicone is not particularly limited. Examples of silicones include dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, decamethylpolysiloxane, and tetramethyltetrahydrogenpolysiloxane.

The ester oil is not particularly limited. Examples of the ester oil include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, myristyl myristate, decyl oleate, cetyl lactate, myristyl lactate, isocetyl stearate, isocetyl isostearate, lanolin acetate, ethyl acetate, butyl acetate, oleyl oleate, cetostearyl alcohol, diisobutyl adipate, diisopropyl sebacate, dioctyl sebacate, hexyldecyl myristate, isocetyl palmitate, and 2-hexyldecyl adipate.

The oils and fats are not particularly limited. Examples of the oils and fats include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, sesame oil, castor oil, linseed oil, safflower oil, jojoba oil, malt oil, coconut oil, palm oil, and hydrogenated castor oil.

The higher fatty acid is not particularly limited. Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, isostearic acid, linoleic acid, linoleic acid, eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), etc.

The wax is not particularly limited. Examples of waxes include beeswax, lanolin, lanolin acetate, candelilla wax, carnauba wax, spermaceti, and montan wax.

The higher alcohol is not particularly limited. Examples of higher alcohols include straight-chain alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, and oleyl alcohol, and branched-chain alcohols such as monostearyl glycerin ether, lanolin alcohol, hexyldodecanol, isostearyl alcohol, and octyldodecanol.

Among these, the oil base contains 70% by mass or more, preferably 75% by mass or more, of a hydrocarbon oil that does not have a hydrophilic group such as a hydroxyl group or a carboxyl group. Furthermore, by containing 70% by mass or more of a hydrocarbon oil in the oil base, the aerosol composition is likely to obtain the cleaning effect and lubricating effect of the hydrocarbon oil. Furthermore, when the oil base is one having a flash point of 40°C or more and a compressed gas described later is used as a propellant, no flame is observed even if the discharged foam is brought close to a fire, so it is safe. Furthermore, it is preferable to contain a solid oil that is solid at 40°C as an oil component other than the hydrocarbon oil. By containing a solid oil, it is possible to improve the foaming property at high temperatures. Examples of solid oils include higher fatty acids such as myristic acid, palmitic acid, stearic acid, and behenic acid, waxes such as beeswax, lanolin, lanolin acetate, candelilla wax, carnauba wax, spermaceti wax, and montan wax, and higher alcohols such as cetyl alcohol, stearyl alcohol, behenyl alcohol, and myristyl alcohol.

The content of the oily base is not particularly limited. For example, the content of the oily base in the oily concentrate is preferably 60% by mass or more, and more preferably 65% by mass or more. The content of the oily base in the oily concentrate is preferably 95% by mass or less, and more preferably 93% by mass or less. When the content of the oily base is within the above range, the aerosol composition has excellent stability and excellent foaming properties of the ejected product.

Surfactant The aerosol composition of the present embodiment contains a polyoxyethylene alkyl ether having an HLB of 15 to 20, and a nonionic surfactant having an HLB of 10 or less.

Polyoxyethylene alkyl ethers with an HLB of 15 to 20 are blended to foam when dispensed.

The polyoxyethylene alkyl ether having an HLB of 15 to 20 is not particularly limited. Examples of polyoxyethylene alkyl ethers having an HLB of 15 to 20 include polyoxyethylene lauryl ethers such as laureth-21 and laureth-25; polyoxyethylene cetyl ethers such as ceteth-15, ceteth-20, ceteth-23, ceteth-25, ceteth-30, and ceteth-40; polyoxyethylene stearyl ethers such as steareth-20; polyoxyethylene oleyl ethers such as oleth-15, oleth-20, and oleth-50; and polyoxyethylene behenyl ethers such as beheneth-20 and beheneth-30. Among these, it is preferable that the polyoxyethylene alkyl ether having an HLB of 15 to 20 contains polyoxyethylene lauryl ether in terms of good foaming of the oil base.

The content of polyoxyethylene alkyl ether having an HLB of 15 to 20 is not particularly limited. For example, the content of polyoxyethylene alkyl ether having an HLB of 15 to 20 in the oil-based concentrate is preferably 1% by mass or more, and more preferably 2% by mass or more. The content of polyoxyethylene alkyl ether having an HLB of 15 to 20 in the oil-based concentrate is preferably 15% by mass or less, and more preferably 12% by mass or less. When the content of polyoxyethylene alkyl ether having an HLB of 15 to 20 is within the above range, the aerosol composition tends to foam when discharged.

A nonionic surfactant with an HLB of 10 or less is added to homogenize the oil base and the polyoxyethylene alkyl ether with an HLB of 15 to 20, stabilizing the aerosol composition.

The nonionic surfactant having an HLB of 10 or less is not particularly limited. For example, the nonionic surfactant having an HLB of 10 or less is polyglycerin fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene glycerin fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbit fatty acid ester, propylene glycol fatty acid ester, glycerin fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sterol, polyethylene glycol fatty acid ester, etc. In particular, in order to promote homogenization of the oil base and the polyoxyethylene alkyl ether having an HLB of 15 to 20 and to stabilize the aerosol composition even at low temperatures, it is preferable that the nonionic surfactant having an HLB of 10 or less includes at least one selected from the group consisting of polyglycerin fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene glycerin fatty acid ester, sorbitan fatty acid ester, and polyoxyethylene sorbit fatty acid ester.

The content of the nonionic surfactant having an HLB of 10 or less is not particularly limited. For example, the content of the nonionic surfactant having an HLB of 10 or less in the oil-based concentrate is preferably 1% by mass or more, and more preferably 2% by mass or more. The content of the nonionic surfactant having an HLB of 10 or less in the oil-based concentrate is preferably 20% by mass or less, and more preferably 15% by mass or less. When the content of the nonionic surfactant having an HLB of 10 or less is within the above range, the obtained aerosol composition is easily homogenized with the oil base and the polyoxyethylene alkyl ether having an HLB of 15 to 20, and a stable aerosol composition is easily obtained.

In the aerosol composition of this embodiment, the content of the surfactant (the sum of the polyoxyethylene alkyl ether having an HLB of 15 to 20 and the nonionic surfactant having an HLB of 10 or less) in the oil-based concentrate is preferably 3% by mass or more, and more preferably 4% by mass or more. In addition, the content of the surfactant (the sum of the polyoxyethylene alkyl ether having an HLB of 15 to 20 and the nonionic surfactant having an HLB of 10 or less) in the oil-based concentrate is preferably 30% by mass or less, and more preferably 25% by mass or less. By having the content of the surfactant (the sum of the polyoxyethylene alkyl ether having an HLB of 15 to 20 and the nonionic surfactant having an HLB of 10 or less) within the above range, the aerosol composition has excellent stability and is more likely to produce a more stable foam.

The ratio (mass ratio) of the content of polyoxyethylene alkyl ether to the content of nonionic surfactant is preferably 5:3 to 1:4, and more preferably 4:3 to 1:3. By having the ratio (mass ratio) of the content of polyoxyethylene alkyl ether to the content of nonionic surfactant within the above range, the aerosol composition tends to have a uniform composition and tends to foam more stably.

Returning to the explanation of the oil-based concentrate as a whole, the oil-based concentrate may contain the above-mentioned oil base, polyoxyethylene alkyl ether with an HLB of 15 to 20, and nonionic surfactant with an HLB of 10 or less, as well as optional ingredients such as other surfactants, alcohols, non-aqueous thickeners, powders, and active ingredients, depending on the application.

Surfactants (other surfactants) are preferably added for purposes such as improving foaming properties and stabilizing the aerosol composition.

The surfactant is not particularly limited. Examples of the surfactant include polyoxyethylene alkyl ethers with an HLB of 10 to 15, nonionic surfactants with an HLB of more than 10 (excluding polyoxyethylene alkyl ethers), anionic surfactants, cationic surfactants, amphoteric surfactants, silicone-based surfactants, and natural surfactants.

When a surfactant is added, the content of the surfactant is not particularly limited. As an example, the content of the surfactant in the oil-based concentrate is preferably 0.1% by mass or more, and more preferably 0.5% by mass or more. The content of the surfactant in the oil-based concentrate is preferably 10% by mass or less, and more preferably 8% by mass or less. When the content of the surfactant is within the above range, the above effects of adding the surfactant are easily obtained.

Alcohols are preferably added to adjust the foaming and drying properties.

The alcohols are not particularly limited. Examples of alcohols include monohydric alcohols such as ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol; dihydric alcohols such as ethylene glycol, propylene glycol, and 1,3-butylene glycol; trihydric alcohols such as glycerin and trimethylolpropane; tetrahydric alcohols such as pentaerythritol; pentahydric alcohols such as xylitol; hexahydric alcohols such as sorbitol and mannitol; and polymers of polyhydric alcohols such as diethylene glycol, dipropylene glycol, triethylene glycol, polypropylene glycol, diglycerin, polyethylene glycol, and triglycerin.

When alcohols are blended, the content of the alcohols is not particularly limited. For example, the content of the alcohols in the oil-based concentrate is preferably 1% by mass or more, and more preferably 3% by mass or more. The content of the alcohols in the oil-based concentrate is preferably 30% by mass or less, and more preferably 25% by mass or less. By having the content of the alcohols within the above range, the foaming and drying properties of the ejected product of the aerosol composition can be easily adjusted appropriately.

Non-aqueous thickeners are preferably added to adjust the viscosity of the concentrate.

The non-aqueous thickener is not particularly limited. Examples of non-aqueous thickeners include aromatic hydrocarbons including aromatic vinyl monomers such as styrene, vinyl toluene, α-methylstyrene, and methoxystyrene; aliphatic hydrocarbons including aliphatic alkenes such as ethylene, propylene, butene, decene, isoprene, butylene, butadiene, and pentadiene; alkyl dimethicones, polysilicones, and esters of higher fatty acids.

When a non-aqueous thickener is blended, the content of the non-aqueous thickener is not particularly limited. For example, the content of the non-aqueous thickener in the oil-based concentrate is preferably 0.5% by mass or more, and more preferably 1% by mass or more. The content of the non-aqueous thickener in the oil-based concentrate is preferably 5% by mass or less, and more preferably 3% by mass or less. By having the content of the non-aqueous thickener within the above range, the viscosity of the oil-based concentrate can be easily adjusted appropriately in the aerosol composition.

Powders are preferably blended to improve the feel of the product, such as making it easier to slip.

The powder is not particularly limited. Examples of the powder include talc, kaolin, mica, magnesium carbonate, calcium carbonate, zinc silicate, magnesium silicate, aluminum silicate, calcium silicate, silica, zeolite, ceramic powder, charcoal powder, nylon powder, silk powder, urethane powder, silicone powder, and polyethylene powder.

When a powder is contained, the amount of the powder is not particularly limited. For example, the amount of the powder in the oil-based concentrate is preferably 0.1% by mass or more, and more preferably 0.3% by mass or more. The amount of the powder in the oil-based concentrate is preferably 5% by mass or less, and more preferably 3% by mass or less. When the amount of the powder is within the above range, the aerosol composition is more likely to achieve the effects of containing the powder.

The oil-based concentrate of this embodiment may further contain various active ingredients depending on the purpose of the product. There are no particular limitations on the active ingredients. Examples of active ingredients include rust inhibitors, various fragrances such as natural fragrances and synthetic fragrances, and solid lubricants such as boron nitride, graphite, molybdenum disulfide, and talc.

When an active ingredient is added, the content of the active ingredient is not particularly limited. For example, the content of the active ingredient in the oil-based concentrate is preferably 0.01% by mass or more, and more preferably 0.1% by mass or more. The content of the active ingredient in the oil-based concentrate is preferably 20% by mass or less, and more preferably 10% by mass or less.

Returning to the explanation of the oily concentrate as a whole, the content of the oily concentrate is not particularly limited. As an example, the content of the oily concentrate in the aerosol composition is preferably 80% by mass or more, and more preferably 85% by mass or more. Moreover, the content of the oily concentrate in the aerosol composition is preferably 99.99% by mass or less, and more preferably 99.9% by mass or less. When the content of the oily concentrate is within the above range, the aerosol composition is likely to form stable foam.

The method for preparing the oily concentrate is not particularly limited. The oily concentrate can be prepared by a conventionally known method. For example, the oily concentrate can be prepared by adding and mixing an oily base, a polyoxyethylene alkyl ether with an HLB of 15 to 20, a nonionic surfactant with an HLB of 10 or less, optional ingredients, etc.

(Propellant)
The propellant is formulated to cause the aerosol composition to be expelled from the aerosol container in a foamed state.

The propellant preferably contains compressed gas. The compressed gas is partially dissolved in the oily concentrate inside the aerosol container, and when discharged to the outside, it acts as a foaming agent that foams the oily concentrate. In addition, the compressed gas that is not dissolved in the oily concentrate is compressed in the gas phase and acts as a pressurizing agent that increases the pressure. In addition, by using compressed gas as a propellant, the aerosol composition is less susceptible to the temperature during use and is easily discharged in a stable foam form.

The compressed gas is not particularly limited. Examples of compressed gas include carbon dioxide gas, nitrous oxide gas, nitrogen gas, compressed air, etc. Among these, it is preferable that the compressed gas be carbon dioxide gas or nitrous oxide gas, since they are easily dissolved in the oil-based concentrate.

The equilibrium pressure of the compressed gas is not particularly limited. For example, the compressed gas is filled into an aerosol container filled with an oily concentrate, and the equilibrium pressure in the aerosol container at 25°C is preferably 0.4 MPa or more, and more preferably 0.5 MPa or more. The equilibrium pressure in the aerosol container at 25°C is preferably 0.8 MPa or less, and more preferably 0.7 MPa or less. The content of the compressed gas in the aerosol composition is preferably 1% by mass or more, and more preferably 2% by mass or more. The content of the compressed gas in the aerosol composition is preferably 10% by mass or less, and more preferably 8% by mass or less.

The propellant may be blended with a liquefied gas to adjust the foaming property. The liquefied gas is not particularly limited. For example, the liquefied gas may be normal butane, isobutane, propane, or a mixture thereof such as liquefied petroleum gas, dimethyl ether, or hydrofluoroolefin. The liquefied gas may be used in combination. Among these, the liquefied gas is preferably normal butane, isobutane, propane, or a mixture thereof such as liquefied petroleum gas, because it is easier to form a more stable aerosol composition.

The amount of liquefied gas contained is not particularly limited. For example, the amount of liquefied gas contained in the aerosol composition is preferably 1% by mass or more, and more preferably 3% by mass or more. The amount of liquefied gas contained in the aerosol composition is preferably 20% by mass or less, and more preferably 15% by mass or less. When the amount of liquefied gas contained in the aerosol composition is within the above range, the aerosol composition can easily foam the oily concentrate to form a foam.

Returning to the explanation of the aerosol composition as a whole, the method for preparing the aerosol composition is not particularly limited. As an example, the aerosol composition can be prepared by filling a concentrate into a pressure-resistant container body, attaching a valve to the container body to form an aerosol container, filling the concentrate with a propellant through the valve, and mixing the concentrate with the propellant.

The container body is a pressure-resistant container for filling the aerosol composition under pressure. The container body may be of any general-purpose shape. For example, the container body is a bottomed cylindrical shape with an opening at the top. The opening is a filling port for filling the concentrate. The container body becomes a discharge container by attaching a valve to the opening and closing it.

The material of the container body is not particularly limited. The container body only needs to have a pressure resistance sufficient to fill the aerosol composition under pressure. Such materials include metals such as aluminum and tinplate, synthetic resins such as polyethylene terephthalate, and pressure-resistant glass.

As described above, according to this embodiment, the aerosol composition is composed of an oily concentrate and a propellant, the oily concentrate contains an oily base and a surfactant, and the oily base contains 70% by mass or more of hydrocarbon oil in the oily base. Therefore, the foamable aerosol composition is likely to obtain the effects of the hydrocarbon oil, such as the cleaning effect for cleaning oily stains and the lubricating effect. In addition, the foamable aerosol composition contains a polyoxyethylene alkyl ether having an HLB of 15 to 20 and a nonionic surfactant having an HLB of 10 or less. As a result, the foamable aerosol composition has excellent composition stability and foaming of the discharged product, is easily attached to the object to be sprayed, and is likely to obtain the effects of the hydrocarbon oil described above. Therefore, the foamable aerosol composition can be suitably used as a cleaning agent such as a brake cleaner or a parts cleaner, or as a lubricant.

The present invention will be described in more detail below with reference to examples. The present invention is not limited to these examples.

Example 1
A stock solution 1 was prepared according to the recipe shown in Table 1 below. 30 g of this stock solution 1 was filled into a pressure-resistant container, and a valve was fixed to the mouth of the pressure-resistant container. Carbon dioxide gas was filled from the valve so that the pressure inside the aerosol container was 0.6 MPa (25° C.), and the aerosol composition of Example 1 was prepared. The amount of carbon dioxide gas filled was 1.7 g (5.4 mass%).

(Examples 2 to 20, Comparative Examples 1 to 4)
Each stock solution was prepared according to the formulation shown in Tables 1 to 3. Using the obtained stock solutions, compressed gas was filled in the same manner as in Example 1 according to the formulations shown in Tables 4 to 6, to prepare the aerosol compositions of Examples 2 to 20 and Comparative Examples 1 to 4, respectively.

(Examples 21 to 24)
Each stock solution was prepared according to the recipe shown in Table 7. 46 g of the obtained stock solution was filled into a pressure-resistant container, and a valve was fixed to the mouth of the pressure-resistant container. 4 g of liquefied gas was filled through the valve according to the recipe shown in Table 8, and the aerosol compositions of Examples 21 to 24 were prepared.

The appearance and ejection state of the aerosol compositions obtained in Examples 1 to 24 and Comparative Examples 1 to 4 were evaluated by the following evaluation methods. The results are shown in Tables 4 to 6 and 8.

(Appearance of the aerosol composition)
Pressure-resistant containers using transparent glass containers as the container bodies were kept at 5° C. and 25° C. for 24 hours, and the state of each aerosol composition was visually observed and evaluated according to the following evaluation criteria.
(Evaluation Criteria)
⊚: The aerosol composition was homogeneous, without separation or precipitation.
◯: The aerosol composition was slightly separated when left to stand, but became homogenous when shaken.
×: The aerosol composition was separated, and precipitates were observed that did not become uniform even when shaken.

(Discharge state)
The pressure-resistant container made of tinplate was immersed in a thermostatic water bath at 25° C. for 1 hour, and the aerosol composition was discharged onto the axle (bottom bracket) of a bicycle pedal. The state of the discharged matter was evaluated according to the following evaluation criteria.
(Evaluation Criteria)
◯: The discharged material foamed and adhered to the shaft, and after maintaining the foamy state for a while, the foam disappeared.
x: The discharged material was liquid without foaming, did not adhere to the shaft part, and immediately dripped off.

As shown in Tables 4 to 6 and 8, the aerosol compositions of Examples 1 to 24 of the present invention had a stable appearance without precipitates at each temperature and were stable foams. On the other hand, the aerosol composition of Comparative Example 1 using stock solution 15 that does not contain a nonionic surfactant with an HLB of 10 or less had precipitates at 5°C and 25°C, had the appearance of an unstable aerosol composition, and was unable to form foam. The aerosol composition of Comparative Example 2 using stock solution 16 that does not contain a polyoxyethyl alkyl ether with an HLB of 15 to 20 had the appearance of a stable aerosol composition without precipitates at each temperature, but was unable to form foam. The aerosol composition of Comparative Example 3 using stock solution 23 that contains a nonionic surfactant with an HLB of 16.9 instead of a polyoxyethyl alkyl ether with an HLB of 15 to 20 had the appearance of a stable aerosol composition without precipitates at each temperature, but was unable to form foam. The aerosol composition of Comparative Example 4, which used stock solution 24 containing only surfactants with an HLB greater than 10, had precipitates at 5°C and 25°C, had the appearance of an unstable aerosol composition, and was unable to form foam.

Claims (5)

It consists of an oil-based concentrate and a propellant,
The oily concentrate contains an oily base and a surfactant,
The oil base contains a hydrocarbon oil in an amount of 70% by mass or more in the oil base,
The surfactant comprises a polyoxyethylene alkyl ether having an HLB of 15 to 20 and a nonionic surfactant having an HLB of 10 or less;
A foamable aerosol composition, in which the content of the oily concentrate is 80 to 99.99% by mass in the aerosol composition (excluding the case where the content of the aqueous component in the oily concentrate is 10% by weight or more). 2. The foamable aerosol composition according to claim 1, wherein the nonionic surfactant having an HLB of 10 or less is at least one selected from the group consisting of polyglycerin fatty acid esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene glycerin fatty acid esters, sorbitan fatty acid esters, and polyoxyethylene sorbit fatty acid esters. 3. The foamable aerosol composition according to claim 1 , wherein the content of the surfactant in the oily concentrate is 3 to 30% by mass. The foamable aerosol composition according to any one of claims 1 to 3 , wherein the content ratio of said polyoxyethylene alkyl ether to said nonionic surfactant is 5:3 to 1:4. The foamable aerosol composition of any one of claims 1 to 4 , wherein the propellant comprises a compressed gas.