JP7229890B2 - Aerosol composition - Google Patents

Description

The present disclosure relates to aerosol compositions.

As one aspect of an aerosol composition comprising a liquid concentrate composition and a propellant, there is known one in which when shear stress is applied to a foam extruded from an aerosol container, a popping sound like popping of the foam is produced. It is used in cosmetics for scalp and skin care. In the present disclosure, hereinafter, a popping sound such as popping of bubbles generated from the aerosol composition is referred to as "popping sound". In addition, the above-mentioned phenomenon that the foaming sound is generated from the discharge is also called "cracking" by diverting the English word "crackling".

Patent Document 1 discloses an aerosol composition comprising an aqueous stock solution containing a water-soluble polymer, a surfactant and a lower alcohol, and a liquefied gas, which forms a foam that makes a crackling sound when ejected, wherein the lower alcohol is contained in an aqueous stock solution in an amount of 1 to 30% by weight, and a liquefied gas having a boiling point of -5°C or less is contained in an amount of 38% by weight or more in the aerosol composition.
Patent Document 2 discloses an aerosol composition consisting of an undiluted solution and a liquefied gas, wherein the undiluted solution contains an oily base, a water-soluble polymer, a surfactant and water, and the IOB value of the oily base (inorganic / organic balance) is 0.2 to 0.5, the blending amount is 3 to 30% by weight in the stock solution, and the blending ratio of the stock solution and liquefied gas is 50/50 to 10/90 (weight ratio). Certain aerosol compositions are disclosed.
In Patent Document 3, (A) 0.005 to 1% by mass of high polymer polyethylene oxide having a molecular weight of 100,000 or more, (B) 0.05 to 3% by mass of nonionic surfactant, (C) 1 to 30% by mass of ethanol %, (D) 20-70% by weight water, and (E) 28-70% by weight propellant.

JP-A-2003-335629 Japanese Patent No. 5180601 Japanese Patent No. 5339929

The aerosol composition described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-335629) contains a predetermined amount of liquefied gas having a boiling point of −5° C. or lower. ), and it is said that the discharged material forms a foam with a large breaking sound and a large cooling sensation due to the heat of vaporization. However, a study by the present inventors revealed that the aerosol composition described in Patent Document 1 is highly irritating to the skin, causing some users to feel pain, and that there is a risk of frostbite depending on how it is used.

In the aerosol composition described in Patent Document 2 (Japanese Patent No. 5180601), the ejected material becomes a viscous liquid or a paste, and then gradually foams and spontaneously emits a loud crackling sound. In addition, when a shearing force is applied with the fingertips or the palm of the hand, a louder foam-breaking sound and a pleasant feel due to stimulation can be obtained, and such a foam-breaking effect is said to last for a long time. However, the present inventors' studies have revealed that the aerosol composition described in Patent Document 2 does not have a sufficient foam-breaking effect, and that it tends to feel sticky due to the oil.

The cracking lotion described in Patent Document 3 (Japanese Patent No. 5339929) suppresses foaming when discharged from an aerosol can by using a highly polymerized polyethylene oxide, and has a strong feeling of breaking bubbles and a cooling sensation when applied. It is said to be a cracking lotion that easily blends into the skin and is less sticky. However, a study by the present inventors revealed that the cracking lotion described in Patent Literature 3 has a short duration of the foam-breaking effect and the effect is not sufficient.

A problem to be solved by an embodiment of the present disclosure is to provide an aerosol composition that is excellent in cooling sensation, break sound and foam retention.

The present disclosure includes the following aspects.
<1> Contains two or more types of polyoxyethylene alkyl ethers, a water-soluble polymer, water, and a propellant containing a liquefied gas, and hydrophilicity exhibited by each of the two or more types of polyoxyethylene alkyl ethers An aerosol composition which has a weighted average value of 10.0 or less based on the content mass ratio of the oil balance value, and which forms a foamy substance upon ejection.
<2> The aerosol composition according to <1>, further comprising powder.
<3> The aerosol composition according to <1> or <2>, further comprising an oil agent.
<4> The aerosol composition according to any one of <1> to <3>, further comprising a skin active ingredient.
<5> The aerosol composition according to any one of <1> to <4>, wherein the foam has an average particle diameter of 0.5 mm to 2 mm.
<6> The aerosol composition according to any one of <1> to <5>, which is a skin care cosmetic.

According to one embodiment of the present disclosure, an aerosol composition is provided that is excellent in cooling sensation, bursting sound, and foam retention.

1 is a photograph taken with a high-speed camera of foams formed from aerosol compositions obtained in Example 1 and Comparative Example 8. FIG.

An example of an embodiment of the aerosol composition of the present disclosure will be described in detail below. The aerosol composition of the present disclosure is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the purpose of the present disclosure.

In the present disclosure, a numerical range indicated using "to" means a range including the numerical values before and after "to" as the minimum and maximum values, respectively.
In the numerical ranges described step by step in the present disclosure, upper or lower limits described in a certain numerical range may be replaced with upper or lower limits of other numerical ranges described step by step. In addition, in the numerical ranges described in the present disclosure, upper or lower limits described in a certain numerical range may be replaced with values shown in Examples.
In the present disclosure, a combination of two or more preferred aspects is a more preferred aspect.
In the present disclosure, the content of each component means the total content of the multiple types of substances unless otherwise specified when there are multiple types of substances corresponding to each component.
In this disclosure, the term "aqueous phase" is used as opposed to the term "oil phase" regardless of the type of solvent.

[Aerosol composition]
The aerosol composition of the present disclosure contains two or more polyoxyethylene alkyl ethers, a water-soluble polymer, water, and a propellant comprising a liquefied gas. The value obtained by weighted averaging the hydrophilic-lipophilic balance value (hereinafter referred to as "HLB value") indicated by each based on the content mass ratio (hereinafter referred to as "mixed HLB value") is 10.0 or less is an aerosol composition that forms a foam upon ejection.

That is, the aerosol composition of the present disclosure is a stock solution composition containing two or more polyoxyethylene alkyl ethers with a mixed HLB value of 10.0 or less, a water-soluble polymer, and water, and a liquefied gas A composition of an embodiment comprising a propellant comprising: Preferably, the concentrate composition is an emulsified composition.

The aerosol composition of the present disclosure is excellent in all of cooling sensation, bubbling sound, and foam retention by having the above configuration.
Furthermore, the aerosol composition of the present disclosure has excellent effects in terms of non-stickiness and moisturizing feeling when applied to the skin.
The aerosol composition of the present disclosure may contain components other than polyoxyethylene alkyl ether, water-soluble polymer, and propellant. Other components include powders, oils, functional components (e.g. , skin active ingredients) and the like.

The aerosol compositions of the present disclosure belong to an aspect of compositions called "cracking compositions." In the present disclosure, the term "cracking composition" refers to a countless number of cracking foams, such as when a shear force and/or temperature is applied to a foam discharged from an aerosol container (discharge). It is used for aerosol compositions that produce a bursting sound of

A foam formed by discharging the aerosol composition of the present disclosure onto the skin emits a popping sound and gives a good cooling sensation to the skin. The breaking sound becomes louder when a shearing force is applied to the foam by fingers or the like, and the breaking sound gives a refreshing skin stimulation to the user.

In addition, the aerosol composition of the present disclosure has excellent foam retention. In the present disclosure, the term “foam retention” means that the state of bubbles in the foam after ejection is maintained at the same level as immediately after ejection. The excellent foam retention of the aerosol composition of the present disclosure correlates with the excellent persistence of cool sensation and bursting sound. The foam retention time may be any desired time when using the aerosol composition. For example, the fact that the bubble state is maintained for about 30 seconds after the aerosol composition is discharged can be used as an indicator of the excellent foam retention of the aerosol composition.

In the aerosol composition described in Patent Document 1, there is a restriction that a liquefied gas with a boiling point of -5°C or less is used as a propellant, and such restriction may cause damage such as excessive skin irritation to the user. Become. Neither the aerosol composition described in Patent Document 2 nor the cracking lotion described in Patent Document 3 has a sufficient foam-breaking effect.
In contrast, the aerosol composition of the present disclosure contains two or more polyoxyethylene alkyl ethers with a mixed HLB value of 10.0 or less, a water-soluble polymer, water, and a propellant containing a liquefied gas. By containing it, it gives a good cooling sensation to the user, provides an excellent foam breaking sound, and has excellent foam retention. does not exist in either Furthermore, the propellant in the aerosol composition of the present disclosure may be any propellant containing a liquefied gas, and the degree of freedom in propellant selection is high.

The bubble size of the foam formed from the aerosol composition of the present disclosure is larger than that of conventional foams formed from the same type of composition. The amount of liquid contained is greater than in the conventional case.
A large amount of liquid contained in the foam per unit volume means that a large amount can be applied to the skin. Therefore, for example, when the aerosol composition contains a functional ingredient such as a skin-active ingredient, a larger amount of the functional ingredient can be applied to the skin, and an improvement in the effect of the functional ingredient can be expected. .
Also, the size of the bubbles that the foam has affects how high or low the bubbling sound is, with bubbles containing larger size bubbles producing lower bubbling sounds. A low foam breaking sound can give the user the feeling that a good foam breaking effect is being obtained.

The bubbles of the foam according to the present disclosure have a size that allows the individual bubbles to be clearly visible when visually observed (see FIG. 1(A)). Specifically, the average particle size of cells in the foam is preferably in the range of 0.5 mm to 2 mm, more preferably in the range of 1 mm to 1.5 mm.

The average particle size of air bubbles is measured by the following measuring method.
The aerosol composition is sprayed (discharged) from a container onto a glass substrate, and the bubbles formed are photographed using a high-speed camera combined with an objective lens (for example, Mini UX manufactured by Photron). 20 bubbles existing 0.3 seconds after injection are randomly selected from the photographed image, the longest diameter of each bubble is measured, and the average diameter of the bubbles is obtained by arithmetically averaging the measured values.

The components contained in the aerosol composition of the present disclosure are described below.

<(A) Polyoxyethylene alkyl ether>
Aerosol compositions of the present disclosure contain two or more polyoxyethylene alkyl ethers. The value (mixed HLB value) obtained by weighted averaging the hydrophilic-lipophilic balance value (HLB value) indicated by each of the two or more polyoxyethylene alkyl ethers based on the content mass ratio is 10.0 or less.

Here, the HLB value is an index representing the relative affinity ratio of a surfactant to both liquids in an oil-water system, and means the HLB value at 25° C. according to Griffin's definition. HLB values according to Griffin are reported in J. Am. Soc. Cosm. Chem. , 1954, 5:249-256.
As for the HLB value in the present disclosure, when the catalog value can be confirmed, the catalog value is preferentially adopted.

In the present disclosure, the mixed HLB value of two or more polyoxyethylene alkyl ethers is a weighted average of the HLB values of each polyoxyethylene alkyl ether based on the mass ratio of the content, and is calculated by the following formula. The calculated value is rounded off to the second decimal place and used as the mixed HLB value in the present disclosure.
Mixed HLB value = Σ(HLBx×Wx)/ΣWx
In the above formula, HLBx represents the HLB value of polyoxyethylene alkyl ether X. Wx indicates the mass (g) of polyoxyethylene alkyl ether X.

In the case of Example 1, which will be described later, the mixed HLB value is calculated as follows.
~ Type and amount of polyoxyethylene alkyl ether used ~
・ Steareth-2 (HLB value: 8) ... 0.28 g
・ Beheneth-2 (HLB value: 10) … 0.14 g
~ Calculation of mixed HLB value ~
Mixed HLB value = ((8 x 0.28) + (10 x 0.14)) / (0.28 + 0.14) = 8.7

As a method for confirming the mixed HLB value from the aerosol composition, the polyoxyethylene alkyl ether contained in the aerosol composition is quantified, and the value can be calculated by the above calculation method.

The mixed HLB value is 10.0 or less, preferably 9.6 or less, from the viewpoints of cooling sensation, popping sound and foam retention. The mixed HLB value is preferably 5 or higher, more preferably 6 or higher, even more preferably 7 or higher.

Two or more polyoxyethylene alkyl ethers may be combined so that the mixed HLB value is 10.0 or less.

The mixed HLB value may be adjusted by combining two or more polyoxyethylene alkyl ethers with an HLB value of 10.0 or less, or a polyoxyethylene alkyl ether with an HLB value of 10.0 or less and an HLB value of 10.0. It may be adjusted in combination with polyoxyethylene alkyl ether exceeding 0.

The number of polyoxyethylene alkyl ethers to be combined may be two or three or more, but from the viewpoint of facilitating adjustment of the mixed HLB value, two are more preferable.
As a preferred mode for adjusting the mixed HLB value, from the viewpoint of foam retention and miscibility between the concentrate composition and the propellant, at least one selected from polyoxyethylene alkyl ethers having an HLB value of 4 to 8 and , in combination with at least one selected from polyoxyethylene alkyl ethers having an HLB value of 10 to 20, and an embodiment in which the mixed HLB value is adjusted to 5 to 10, and a poly having an HLB value of 4 to 8 One type selected from oxyethylene alkyl ethers and one type selected from polyoxyethylene alkyl ethers having an HLB value of 10 to 17 are combined to adjust the mixed HLB value to 7 to 9.5. more preferred.

In the present disclosure, the term "polyoxyethylene alkyl ether" is used as a generic term for ethylene oxide adducts of higher fatty acid alcohols.
The aliphatic hydrocarbon group derived from the higher fatty acid alcohol is preferably an alkyl group or an alkenyl group.
The alkyl group or alkenyl group is preferably linear or branched, more preferably linear.
The alkyl or alkenyl group preferably has 12 to 22 carbon atoms.

The average number of moles of ethylene oxide added to the polyoxyethylene alkyl ether is preferably in the range of 1.5-40, more preferably 1.5-30, still more preferably 2-20.
When the average added mole number is 1.5 or more, crystallization of the polyoxyethylene alkyl ether is suppressed, and the solubility in water tends to increase. Further, when the average number of added moles is 40 or less, there is a tendency to obtain a cell size large enough to obtain a good cell breaking effect.

Specific examples of polyoxyethylene alkyl ethers include laureth-2 (HLB value: 9.5), laureth-4 (HLB value: 11.5), laureth-9 (HLB value: 14.5), and ceteth-2. (HLB value: 8), ceteth-6 (HLB value: 10.5), ceteth-7 (HLB value: 11.5), ceteth-10 (HLB value: 13.5), ceteth-15 (HLB value: 15.5), Ceteth-20 (HLB value: 17), Steareth-2 (HLB value: 8), Steareth-4 (HLB value: 9), Steareth-20 (HLB value: 18.0), Oleth-2 (HLB value: 7.5), Oleth-7 (HLB value: 10.5), Oleth-19 (HLB value: 14.5), Oleth-15 (HLB value: 16.0), Beheneth-5 (HLB value: 7), beheneth-10 (HLB value: 10), beheneth-20 (HLB value: 16.5), etc., but these are also not limited.

The polyoxyethylene alkyl ether may be a synthetic product or a commercially available product.

The total content of polyoxyethylene alkyl ethers is preferably 0.05% by mass to 5% by mass, more preferably 0.1% by mass to 3% by mass, and still more preferably It is 0.1% by mass to 1% by mass.
When the total content of the polyoxyethylene alkyl ether is 0.05% by mass or more, the miscibility between the liquefied gas and the concentrate composition is improved, and a good emulsified state tends to be obtained. Further, when the total content of the polyoxyethylene alkyl ether is 5% by mass or less, there is a tendency that the cell size is such that a good cell breaking effect can be obtained.

<(B) Water-soluble polymer>
The aerosol composition of the present disclosure contains a water-soluble polymer.
In the present disclosure, a water-soluble polymer refers to a polymer compound having a solubility of 1% by mass or more in water at 25°C.
The weight average molecular weight of the water-soluble polymer is preferably in the range of 5,000 to 200,000, more preferably in the range of 5,000 to 150,000. The weight average molecular weight of the water-soluble polymer can be measured by gel permeation chromatography (GPC) in terms of polystyrene standard substances.
The water-soluble polymer is not particularly limited as long as it is a polymer compound having water solubility as described above, and known water-soluble polymers and derivatives thereof can be mentioned. A derivative means a compound in which a part of the structure is modified while maintaining the basic skeleton of the polymer compound.
Only one type of water-soluble polymer may be used, or two or more types may be used in combination.

As the water-soluble polymer, polysaccharides such as xanthan gum, carrageenan, gellan gum, alkaseelan, sodium acrylate grafted starch, hydroxypropyl xanthan gum, guar gum, hydroxypropyl guar gum, etc.; Cellulose compounds such as propylcellulose (HPC), hydroxypropylmethylcellulose (HPMC), ethylhydroxyethylcellulose (EHEC), hydroxyethylcellulose (HEC); (Na acrylate/Na acryloyldimethyltaurate) copolymer, (Ammonium acryloyldimethyltaurate/VP) Synthetic polymers including copolymers, (ammonium acryloyldimethyltaurate/carboxyethylammonium acrylate) crosspolymers, water-soluble acrylic polymers such as carbomer, and the like.

Among these, as a water-soluble polymer,
From the viewpoint of further improving the cooling sensation, breaking sound and foam retention, at least one selected from xanthan gum, carrageenan, gellan gum, alkaseelan, sodium acrylate grafted starch, hydroxypropyl xanthan gum, guar gum, and hydroxypropyl guar gum. Polysaccharides and (Na-acrylate/Na-acryloyldimethyltaurate) copolymers are preferred,
At least one polysaccharide selected from xanthan gum, hydroxypropyl xanthan gum, and hydroxypropyl guar gum is more preferable from the viewpoints of cooling sensation, break sound, foam retention and bubble particle size.
Xanthan gum, which is a polysaccharide, is a particularly preferred embodiment because it provides a cooling sensation, a foamy sound, good foam retention, and good bubble particle size, and also has a good feel during use and good storage stability under acidic conditions. one of.

The content of the water-soluble polymer is added to the total mass of the aerosol composition from the viewpoints of cooling sensation, bubbling sound and foam retention, and giving the undiluted solution composition an appropriate viscosity and good miscibility with liquefied gas. On the other hand, it is preferably 0.01% by mass to 5% by mass, more preferably 0.05% by mass to 3% by mass, and still more preferably 0.1% by mass to 1.0% by mass.
When the content of the water-soluble polymer is 0.01% by mass or more, there is a tendency that the cooling sensation, the popping sound, and the longevity of the foam are exhibited more satisfactorily. Further, when the content of the water-soluble polymer is 5% by mass or less, the viscosity of the concentrate composition is improved, the miscibility between the liquefied gas and the concentrate composition is improved, and a good emulsified state tends to be obtained. becomes.

<(C) water>
Aerosol compositions of the present disclosure include water.
Water is not particularly limited, and examples thereof include natural water, purified water, distilled water, ion-exchanged water, pure water, and ultrapure water (eg, Milli-Q water). Note that Milli-Q water is ultrapure water obtained by Merck's Milli-Q (registered trademark) water maker.
As the water contained in the aerosol composition of the present disclosure, for example, purified water, distilled water, ion-exchanged water, pure water, or ultrapure water is preferable from the viewpoint of less impurities.

The content of water can be appropriately adjusted within the range shown below, depending on the intended use (application) and feel of use of the aerosol composition.
The water content is preferably 10% to 90% by mass, more preferably 20% to 80% by mass, and even more preferably 30% to 70% by mass, relative to the total mass of the aerosol composition.

<(D) Propellant containing liquefied gas>
Aerosol compositions of the present disclosure contain a propellant comprising a liquefied gas. The gas used as propellant is selected from those commonly used in aerosol compositions.
The propellant may contain at least one liquefied gas, and may contain only one liquefied gas, or may be a mixed gas containing two or more liquefied gases.
Liquefied gas is included as the main component of the propellant. Here, the main component of the propellant refers to a gas component that accounts for 5% by mass or more of the gas components that constitute the propellant.
When the propellant is a mixed gas, it may be a mixed gas consisting of two or more liquefied gases, or a mixture of one or more liquefied gases and one or more other gases. It may be gas.

Liquefied gas includes, for example, liquefied petroleum gas (LPG) and chlorofluorocarbons. Of these, LPG is preferred, and LPG having a pressure at 20° C. of preferably 0.15 MPa to 0.25 MPa, more preferably 0.15 MPa to 0.20 MPa is suitably used.
Other gases used in combination with liquefied gas include, for example, carbon dioxide gas, nitrogen gas, and compressed gas such as compressed air.

When the propellant is filled into the aerosol container, the internal pressure of the container may be determined not to affect the characteristics and physical properties of the emulsified composition to be filled together, and from the dischargeability.
Specifically, the internal pressure of the container when the propellant is filled is preferably 0.1 MPa or more and 1.5 MPa or less, more preferably 0.2 MPa or more and 1.0 MPa or less, and still more preferably 0.3 MPa or more and 0.85 MPa or less. .

It is preferred that the remainder of the aerosol composition of the present disclosure, minus the propellant, is a concentrate composition.
The content of the propellant is preferably 15% by mass to 70% by mass, more preferably 20% by mass, based on the total mass of the aerosol composition, from the viewpoint of stable emulsification and cooling sensation for the aqueous concentrate composition. 70 mass %, more preferably 25 mass % to 60 mass %.

<(E) Powder>
The aerosol composition of the present disclosure preferably contains powder.
By containing powder in the aerosol composition, the emulsified state of the foam is further improved, and the bubbles are more easily broken. In addition, the inclusion of powder also contributes to the suppression of stickiness.
As the powder, a powder commonly used in cosmetics can be applied.

Examples of powders include inorganic powders such as silica, talc, kaolin, mica, sericite, zeolite, and vermiculite; polyamide resin powders, polyethylene powders, polymethyl methacrylate powders, and (meth)acrylic acid ester resin powders. , crosslinked (meth)acrylic acid ester-based resin powder, polystyrene powder, styrene-acrylic acid copolymer resin powder; and composite powders thereof.

The average particle size of the powder is preferably 1 μm to 60 μm, more preferably 2 μm to 20 μm, and even more preferably 3 μm to 12 μm. The average particle size of powder is the volume average particle size. The average particle size of the powder can be measured, for example, with a Coulter counter manufactured by Beckman Coulter .

The powder content is preferably 0.15% by mass to 5% by mass, preferably 0.2% by mass to 0.2% by mass, based on the total mass of the aerosol composition, from the viewpoint of improving the emulsified state and reducing stickiness in the concentrate composition. 1% by mass is more preferred.

<(F) oil>
The aerosol composition of the present disclosure preferably contains at least one oil.
By containing an oil agent, it is possible to further improve the foam breaking strength and the feeling of use such as a moisturizing feeling. The oil agent may be appropriately selected according to the foam breaking strength, desired feeling of use, and the like.

Oil agents include, for example, ester oils, hydrocarbon oils, silicone oils, higher fatty acids, higher alcohols, and the like.
Examples of ester oils include isopropyl myristate, cetyl ethylhexanoate, octyldodecyl myristate, isocetyl myristate, ethylhexyl palmitate, hexyldecyl ethylhexanoate, isostearyl neopentanoate, octyldodecyl neopentanoate, isotridecyl isononanoate, isostearin. Isopropyl acid, isopropyl palmitate, isononyl isononanoate, isodecyl neopentanoate, neopentyl glycol dicaprate, neopentyl glycol diethylhexanoate, PG dicaprate, diisostearyl malate, tri(caprylic/capric) glyceryl, dicaprylic acid PG, trimethylolpropane triethylhexanoate, pentaerythrityl tetraethylhexanoate, triethylhexanoin, hexyldecyl isostearate and the like.
Hydrocarbons include squalane, vaseline, liquid paraffin and the like.
Examples of silicone oils include cyclopentasiloxane, dimethicone, and the like.
Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, behenic acid and linoleic acid.
Examples of higher alcohols include isostearyl alcohol, oleyl alcohol, octyldodecanol, chimyl alcohol, cholesterol, stearyl alcohol, cetanol, cetostearyl alcohol, selachyl alcohol, decyltetradecanol, batyl alcohol, phytosterols, hexyldecanol, behenyl alcohol, Lauryl alcohol, lanolin alcohol, hydrogenated lanolin alcohol and the like.

The content of the oil agent is preferably 1% by mass to 20% by mass, more preferably 3% by mass to 15% by mass, based on the total mass of the concentrate composition, from the viewpoint of foam breaking strength and feeling during use.
When the content of the oil agent is 1% by mass or more, there is a tendency to obtain better foam breakage and moisturizing feeling. Moreover, when the content of the oil agent is 10% by mass or less, there is a tendency that a more favorable feeling in use with suppressed stickiness is obtained.

<(G) Skin Active Ingredient>
Aerosol compositions of the present disclosure preferably contain at least one skin active ingredient.
In the present disclosure, the skin active ingredient has some active effect on the skin (for example, skin softening effect, whitening effect, anti-inflammatory effect, antioxidant effect, blood circulation promoting effect, anti-aging effect (anti-wrinkle effect), sebum secretion It refers to a functional ingredient that provides an inhibitory effect, etc.).

Skin active ingredients are not particularly limited as long as they are various skin active ingredients used in ordinary cosmetics, quasi-drugs, pharmaceuticals, and the like. Skin active ingredients include, for example, plant extracts, anti-inflammatory agents, moisturizing agents, amino acids, whitening agents, singlet oxygen scavengers, antioxidants, blood circulation promoters, sebum secretion inhibitors, antibacterial agents, and keratinizing agents. etc.
Specific examples of active skin ingredients include carotenoids such as astaxanthin and lycopene, piperine compounds such as tetrahydropiperine and piperine, vitamin E and derivatives thereof such as tocopherol and tocotrienol, ascorbic acid, magnesium ascorbyl phosphate, and glucoside ascorbate. vitamin C, derivatives thereof, plant extracts, etc., but are not limited to these.
Skin active ingredients may be those in which one ingredient is responsible for two or more functions.
In the preparation of the aerosol composition, the skin active ingredient may be contained alone in the undiluted composition, or may be prepared in the form of a solution, emulsion, or the like and then contained in the undiluted composition.

The content of the skin active ingredient in the aerosol composition can be appropriately set according to the type and allowable content of the skin active ingredient.

(Other additive ingredients)
In addition to the above components, the aerosol composition of the present disclosure may optionally contain other additive components within a range that does not impair its effects. As for other additive components, various components that can usually be blended in cosmetics can be used depending on the purpose.
Other additive components include moisturizing agents such as glycerin, 1,3-butylene glycol, sorbitol and trehalose, cooling agents such as ethanol, preservatives such as methylparaben and phenoxyethanol, ultraviolet absorbers, coloring agents, fragrances, and the like. .
One of these additive components may serve two or more functions.

The aerosol composition of the present disclosure is prepared by preparing a stock solution composition containing at least two or more polyoxyethylene alkyl ethers having a mixed HLB value of 10.0 or less, a water-soluble polymer, and water. It can be obtained by combining a liquid concentrate composition and a propellant containing a liquefied gas. Specifically, an aerosol container is filled with an aerosol composition comprising the prepared concentrate composition and a propellant containing a liquefied gas.

~Undiluted solution composition~
The stock solution composition can be suitably produced by a production method including mixing the aqueous phase composition and the oil phase composition and emulsifying the mixture by a conventional method.
The aqueous phase composition contains water, a water-soluble polymer, and a polyoxyethylene alkyl ether, and may contain other water-soluble ingredients.
The oil phase composition contains the oil-soluble components contained in the aerosol composition, and examples of the oil-soluble components include the above-mentioned oil agents and skin-active components that are oil-soluble.

Preferred preparation examples of the concentrate composition are described in detail below.
For example, a) water, a water-soluble polymer, a polyoxyethylene alkyl ether , and if desired, other water-soluble components are mixed and dissolved to obtain an aqueous phase composition, b) an oily agent containing an oil agent, etc. The ingredients can be mixed and dissolved to obtain an oil phase composition, and c) the aqueous phase composition and the oil phase composition are mixed under stirring to emulsify and disperse.
The powder is preferably added to the aqueous phase composition or the emulsified and dispersed composition.

For emulsifying and dispersing, ordinary emulsifying means utilizing shearing action, such as a stirrer, impeller, homomixer, continuous flow type shearing device, etc., can be used. For the purpose of further homogenizing the particle size, emulsification and dispersion may be performed multiple times.

A concentrate composition is prepared as described above.

~Aerosol container and filling~
As the aerosol container to be filled with the aerosol composition of the present disclosure, any pressure-resistant container can be used, and containers using materials such as metal, glass, and plastic can be used.
As a method for filling the aerosol container with the aerosol composition, a known method can be used. Specific examples include the gasser shaker method, the saturator method, the through valve method, the under cup method, and the like.

When the gasser shaker method or the like is used as the filling method for the aerosol cosmetic, aluminum impact cans, aluminum DI (Drawing and Ironing) cans, and tin/monoblock cans, which have high pressure resistance, are preferred.
In addition, when the aerosol container is a double container having an inner bag for filling the content (undiluted composition), the inner bag is made of polyethylene, polypropylene or the like in order to ensure gas permeability to some extent. things are preferred.

-Application of aerosol composition-
Preferred uses of the aerosol composition of the present disclosure include cosmetics such as skin care cosmetics (including skin lotion, serum, etc.) and scalp cosmetics, and skin care cosmetics are preferred.

The aerosol composition of the present disclosure will be described in detail below with reference to examples. However, the following examples are one embodiment, and are not limited to them at all, and various modifications can be made as long as they do not exceed the gist.
In the following description, "parts" and "%" are based on mass unless otherwise specified.

[Example 1]
[Preparation of concentrate composition]
Among the components shown in Table 1, isopropyl myristate, tocopherol, and astaxanthin were heated in a water bath at 80° C. for 1 hour and stirred to obtain an oil phase composition.
Among the components listed in Table 1, xanthan gum, steareth-2, beheneth-10, silica, glycerin, Mg ascorbyl phosphate, and phenoxyethanol are heated in a water bath at 80°C for 1 hour and stirred to form an aqueous phase. A composition was obtained.
While stirring the obtained aqueous phase composition using a vacuum emulsifying stirring device (model: PVQ-3/7UN, Mizuho Kogyo Co., Ltd.), the oil phase composition is added to give a stock solution composition (1). got

[Preparation of aerosol composition and filling into container]
70 parts of the concentrate composition (1) and 30 parts of the propellant (carbon dioxide gas: 0.5 parts, LPG: 29.4 parts) were added to an aerosol container (aluminum pressure-resistant container for aerosol, capacity: 100 mL). After filling, the aerosol composition of Example 1 (cracking composition) was obtained.

[Examples 2 to 36, Comparative Examples 1 to 12]
In Example 1, Examples 2 to 36 and Examples 2 to 36 and The compositions of Comparative Examples 1-12 were obtained and filled into containers.

[Confirmation of bubble size and form]
The aerosol composition was sprayed (discharged) from a container onto a glass substrate, and the bubbles formed were photographed using a high-speed camera (Mini UX manufactured by Photron Co., Ltd.) combined with an objective lens. From the photographed image, 20 bubbles existing at 0.3 seconds after injection were randomly selected, the longest diameter of each bubble was measured, and the average diameter of the bubbles was obtained by arithmetically averaging the measured values.
Based on the obtained average particle diameter, the results of each example and comparative example are classified into the following three ranks and shown in Tables 1 to 6 below.
S: less than 0.2 mm M: 0.2 mm or more and less than 1 mm L: 1 mm or more.

In Comparative Example 5, the concentrate composition and the propellant were separated without being mixed, and no foam was discharged, and the size and shape of the bubbles could not be confirmed.

FIG. 1 shows a photographed image (A) obtained from the aerosol composition of Example 1 and a photographed image (B) obtained from the aerosol composition of Comparative Example 8. As shown in FIG. 1, the foams obtained from the aerosol compositions of the examples had larger bubbles in the range of 0.5 mm to 1 mm than the foams obtained from the aerosol compositions of the comparative examples. can be confirmed to have

[evaluation]
The obtained aerosol composition (cracking composition) was evaluated for the following (1) to (6). The evaluation was conducted by three evaluation monitors under an environment of 25° C. and 50% RH. In Comparative Example 5, the concentrate composition and the propellant were separated without being mixed, and no foam was discharged, so evaluation could not be performed.

Each evaluation was made by three evaluation monitors according to four grades of evaluation criteria of A, B, C and D. Then, A: 4 points, B: 3 points, C: 2 points, C: 1 point, D: 0 points, average the evaluation scores of 3 people, and the evaluation rank corresponding to the value rounded to the first decimal place was used as the evaluation result. The most excellent rank is "A".
The evaluation results are shown in Tables 1 to 6 below.

~Discharge and application of aerosol composition~
The ejection and application of the aerosol composition used for evaluation were performed according to the following procedures 1), 2) and 3).
1) The resulting aerosol composition is discharged onto one palm to form a 2 cm-sized foam (discharge) on the palm.
2) Rub the palm on which the foam is placed and the palm of the other hand to confirm that the foam has broken.
3) Spread the defoamed foam on the skin of the face with both palms.

(1) Cool sensation Cool sensation when the aerosol composition was spread on the skin of the face was evaluated according to the following criteria.
-Evaluation criteria-
A: A pleasant and strong cold sensation was felt.
B: I felt a cold sensation.
C: The cold feeling was unsatisfactory, but at an acceptable level.
D: Felt very cold and painful.

(2) Feeling of foam breaking Immediately after the aerosol composition is discharged into the palm of one hand and a predetermined amount of foam is formed, the palms of both hands are rubbed together, and the sound of foam breaking generated at that time is felt by the palms. The intensity and duration of the vibration felt were evaluated according to the following criteria.
-Evaluation criteria-
A: A large bursting sound and vibration felt with the palm were obtained for a long time.
B: A large breaking sound and a vibration that can be felt in the palm of the hand were obtained.
C: Broken sound and vibration felt in the palm were small but at an acceptable level.
D: Broken bubbles and no vibration felt in the palm were obtained.

(3) Retention of Foam The aerosol composition was discharged onto the palm of one hand to form a predetermined amount of foam, and the state of the foam was visually observed when left for 30 seconds. After confirming the state of air bubbles, both palms were rubbed together to confirm the breakage of air bubbles, and evaluation was made according to the following criteria.
-Evaluation criteria-
A: The same bubble state as immediately after ejection was maintained, and a popping sound was generated.
B: A change was observed, but the bubble state was maintained, and a popping sound was produced.
C: Air bubbles remained and an acceptable level of frothing sound was generated.
D: All bubbles disappeared and the bubbles did not break.

(5) Feeling of stickiness The feeling of stickiness was evaluated according to the following criteria, based on the feeling of touching the skin of the face after spreading the discharge with a hand.
-Evaluation criteria-
A: No stickiness is felt.
B: Feels slightly sticky.
C: Permissible level although stickiness is felt.
D: Strong stickiness is felt.

(6) Moisturizing feeling The degree of moisturizing feeling was evaluated one minute after the discharge was spread on the face according to the following criteria.
-Evaluation criteria-
A: Very moist.
B: It is moist.
C: Slightly moist.
D: No moist feel.

In Tables 1 to 6, "-" described in the composition column means that the corresponding component is not included.

Details of each component listed in Tables 1 to 6 are as follows.
・Xanthan gum [Product name: Nomcort ZZ, Nisshin OilliO Co., Ltd.]
・Gellan gum [Product name: KELCOGEL CG-LA, Sansho Co., Ltd.]
・Carrageenan [Product name: GENUGEL SWG-J, Sansho Co., Ltd.]
・Alcaseeran [Product name: Alcaseeran, Hakuto Co., Ltd.]
・ Sodium acrylate grafted starch [trade name: MAKIMOUSSE12, Daito Kasei Co., Ltd.]
・Hydroxyethyl cellulose [trade name: SUNHEC, Sansho Co., Ltd.]
・Hydroxypropyl guar gum [trade name: JAGUAR HP-105, Sansho Co., Ltd.]
・ Tamarind gum [Product name: Griloid 6C, DSP Gokyo Food & Chemical Co., Ltd.]
・Hydroxypropyl methylcellulose [trade name: NEOVISCO MC, Sansho Co., Ltd.]
・Hydroxypropyl xanthan gum [Product name: Labor Gum EX, DSP Gokyo Food & Chemical Co., Ltd.]
・Carbomer [trade name: Ultrez30, Lubrizol Co., Ltd.]
・(Sodium acrylate/Na acryloyldimethyltaurate) copolymer ・Hydrophobic hydroxypropyl methylcellulose [trade name: Sangelose 90, Daido Kasei Kogyo Co., Ltd.]
・ High polymer PEG [trade name: Alcox E-30, Meisei Chemical Co., Ltd.]

・Ceteth-2 [trade name: NIKKOL BC-2, HLB value: 8, Nikko Chemicals Co., Ltd.]
・Ceteth-7 [trade name: NIKKOL BC-7V, HLB value: 11.5, Nikko Chemicals Co., Ltd.]
・Ceteth-10 [trade name: NIKKOL BC-10, HLB value: 13.5, Nikko Chemicals Co., Ltd.]
・Ceteth-20 [Product name: NIKKOL BC-20, HLB value: 17, Nikko Chemicals Co., Ltd.]
・ Steareth-2 [trade name: NIKKOL BS-2, HLB value: 8, Nikko Chemicals Co., Ltd.]
・ Steareth-4 [trade name: NIKKOL BS-4, HLB value: 9, Nikko Chemicals Co., Ltd.]
・Oles-2 [Product name: NIKKOL BO-2V, HLB value: 7.5, Nikko Chemicals Co., Ltd.]
・Oles-7 [trade name: NIKKOL BO-7V, HLB value: 10.5, Nikko Chemicals Co., Ltd.]
・Beheneth-5 [Product name: NIKKOL BB-5, HLB value: 7, Nikko Chemicals Co., Ltd.]
・Beheneth-10 [Product name: NIKKOL BB-10, HLB value: 10, Nikko Chemicals Co., Ltd.]
・Beheneth-20 [Product name: NIKKOL BB-20, HLB value: 16.5, Nikko Chemicals Co., Ltd.]
・ PEG-20 sorbitan cocoate [trade name: NIKKOL TL-10, HLB value: 17, Nikko Chemicals Co., Ltd.]

・Silica [trade name: Sunsphere H51, average particle size: 5 μm, AGC Si Tech Co., Ltd.]
・Talc [trade name: SA Talc-JA-46R, average particle size: 7-11 μm, Miyoshi Kasei Co., Ltd.]
・Isopropyl myristate [Product name: IPM-100, Nikko Chemicals Co., Ltd.]
・Cetyl ethylhexanoate [trade name: CIO, Nikko Chemicals Co., Ltd.]
・Cyclomethicone [trade name: SH245, Toray DC Silicone Co., Ltd.]
・Methylpentanediol dineopentanoate [trade name: NEOSOLUE-MP, Nippon Fine Chemical Co., Ltd.]
・Astaxanthin [Product name: FUJIFILM Astaxanthin S, FUJIFILM Corporation]
・Tocopherol [Product name: Riken E Oil 800, Riken Co., Ltd.]
・Glycerin (Sakamoto Yakuhin Co., Ltd.)
・Methylparaben ・EDTA
・Water: purified water ・LPG [liquefied gas, trade name: LPG 20°C 0.15, Koike Chemical Co., Ltd.)
・Carbon dioxide (compressed gas, Taiyo Nippon Sanso)

As is clear from Tables 1 to 6, all of the aerosol compositions of Examples were excellent in terms of cooling sensation, popping sound, and foam retention. On the other hand, the aerosol compositions of Comparative Examples were inferior in at least one of cooling sensation, bubbling sound and foam retention.
Furthermore, the aerosol compositions of Examples had a suppressed sticky feeling and also had a moisturizing feeling.
Comparative Example 5 could not be evaluated as an aerosol composition.

[Example 37]
An aerosol composition of Example 37 was obtained in the same manner as in Example 1, except that 1 g of emulsion Z prepared below was added and the amount of water was adjusted to make the total amount 100 g. rice field.
Emulsion Z is an emulsion containing tetrahydropiperine, which is a skin active ingredient.

<Preparation of emulsion Z>
Each component constituting oil phase composition X having the following composition was placed in a container and stirred in a water bath at 80° C. for 1 hour using a stirrer to obtain oil phase composition X. Next, each component constituting an aqueous phase composition Y having the following composition was placed in a container and stirred for 1 hour using a stirrer in a water bath at 80 ° C. to obtain an aqueous phase composition Y. .
Next, in a water bath at 80° C., the aqueous phase composition Y is stirred using a stirrer, and the oil phase composition X is gradually added to the aqueous phase composition Y during stirring to obtain a mixture. rice field. The resulting mixture was subjected to dispersion treatment for 1 minute per 100 g using an ultrasonic homogenizer [model number: US600-AT, Nippon Seiki Seisakusho Co., Ltd.] to obtain a coarse dispersion. Next, using a high-pressure emulsifier [product name: Starburst Mini, Sugino Machine Co., Ltd.], emulsification treatment (pressure: 245 MPa, 2 passes in a pass system) is performed on the obtained coarse dispersion to emulsify. I got the thing Z.

<Oil Phase Composition X>
・ Tetrahydropiperine [trade name: Cosmoperine, purity: 99.9%, Sabinsa Japan Co., Ltd.] 0.75% by mass
・ Isononyl isononanoate [trade name: NINI-99, Nippon Emulsion Co., Ltd.] 13.25% by mass
・ Lecithin [trade name: SLP-White, Tsuji Oil Co., Ltd.] 1.0% by mass

<Aqueous phase composition Y>
・Polyglyceryl oleate-10 [trade name: NIKKOL Decaglyn 1-OV, Nikko Chemicals Co., Ltd.] 6.7% by mass
・ Sucrose stearate [trade name: DK Ester SS, monoester (catalog value): 97% by mass, Daiichi Kogyo Seiyaku Co., Ltd.] 3.3% by mass
・ Glycerin [Kao Corporation] 45.0% by mass
・ Water (purified water) 30.0% by mass

Claims (6)

containing two or more types of polyoxyethylene alkyl ethers, a water-soluble polymer, water, and a propellant containing a liquefied gas;
The value obtained by weighted averaging the hydrophilic-lipophilic balance value indicated by each of the two or more polyoxyethylene alkyl ethers based on the content mass ratio is 7 or more and 10.0 or less,
The water-soluble polymer is at least one selected from xanthan gum, hydroxypropyl xanthan gum and hydroxypropyl guar gum,
An aerosol composition that forms a foam upon ejection. 2. The aerosol composition of claim 1, further comprising powder. 3. The aerosol composition according to claim 1, further comprising an oil agent. 4. The aerosol composition according to any one of claims 1 to 3, further comprising a skin active ingredient. 5. The aerosol composition according to any one of claims 1 to 4, wherein the average particle size of the bubbles contained in the foam is in the range of 0.5 mm to 2 mm. The aerosol composition according to any one of claims 1 to 5, which is a skin care cosmetic.

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