JP7733971B2 - Skin cleansing spray - Google Patents

Description

The present invention relates to a skin cleansing spray that is sprayed directly onto the skin.

A variety of skin cleansing compositions, including facial cleansers, body soaps, and shampoos, are available as products designed to cleanse the skin and keep it clean. The mechanism by which skin cleansing compositions cleanse the skin is that surfactants adsorb to dirt, reducing the surface tension between the dirt and water, which, combined with the mechanical force caused by friction, causes the dirt to float up into the water. For this cleansing mechanism to function effectively, it is necessary to incorporate surfactants at or above their critical micelle concentration.

However, surfactants with excessively strong cleansing power can cause skin irritation, resulting in dry skin and other skin problems. For this reason, various formulas have been proposed that adjust the combination and amounts of cleansing ingredients to make the product milder on the skin. In particular, it is generally accepted that formulas that improve foam quality, such as foaming power and foam retention, are excellent formulas for making the product milder on the skin, as the foam formed during cleansing is recognized to reduce the friction that occurs when skin comes into direct contact with fingers.

For this reason, various pump-former-type skin cleansers have been proposed in recent years, attracting attention not only for their ease of easily producing high-quality foam, but also for their gentleness on the skin. Specifically, Patent Document 1 discloses a liquid skin cleanser product comprising a former container and a liquid skin cleanser composition filled in the former container, wherein the liquid skin cleanser composition contains (A) 3 to 10% by mass of a specific fatty acid salt having a linear or branched monovalent hydrocarbon group with 7 to 21 carbon atoms, (B) a specific copolymer of dimethyldiallylammonium chloride and acrylic acid and/or acrylamide, and (C) a sugar alcohol, and wherein the mass ratio (A)/(B) of the content of component (A) to the content of component (B) is 20 to 250. Patent Document 2 discloses a skin cleanser composition characterized by being filled in a former container with a cleanser containing (a) 2 to 9% by mass of a fatty acid salt, (b) 0.5 to 4% by mass of lauryldimethylaminoacetic acid betaine, and (c) 1 to 10% by mass of one or more dihydric alcohols, wherein the sum of the blending amounts (by mass) of components (a) and (b), (a) + (b), is 3 to 10% by mass and the blending ratio (b)/(a) is 0.1 to 0.5. Patent Document 3 further discloses a cleanser composition dispensed from a former container, which contains (a) lauryldimethylaminoacetic acid betaine and (b) 4 to 15% by mass of a higher fatty acid soap of a specific composition formed from a fatty acid having 5 to 25 carbon atoms.

On the other hand, sunburned skin experiences inflammation that can be considered a type of burn, and its barrier function and moisture retention ability are reduced compared to normal skin. Common treatments for sunburned skin include cooling the affected area with water or ice and applying anti-inflammatory agents. Furthermore, Patent Document 4 describes the use of a composition containing a cooling agent dissolved in a solvent containing (R)-1,2-propanediol in the treatment of sunburned skin, and Patent Document 5 describes the use of a specific hydrated hemi-tartrate benzimidazol-2-ylpyrimidine compound in the treatment of sunburned skin.

International Publication No. 2014/003114 JP 2016-098182 A International Publication No. 2017/081897 Special Publication No. 2014-508740 Special Publication No. 2016-510752

Pump-former-type skin cleanser compositions contain a relatively small amount of surfactant, which is thought to mean they tend to cause less skin irritation than solid or semi-solid skin cleanser compositions. On the other hand, because pump-former-type skin cleanser compositions are designed to be discharged in foam form, it is essential that they contain the minimum amount of surfactant necessary to generate foam.

In addition, a variety of skin cleansers have been developed to remove dirt and body fluids such as sebum and sweat, excluding those designed to remove makeup (cleansing). However, all skin cleansers, without exception, are designed to be lathered before application to the skin, and it is also common knowledge that lathering well before washing is preferable in that it reduces friction on the skin. While foam can reduce physical friction by being placed between the skin and the hands, the foam itself, when rubbed against the skin, still generates physical friction and irritates the skin. Irritation remains a particular concern for sensitive skin, such as after sunburn, where inflammation has reduced the skin's barrier function and moisture retention ability.

As such, there is a limit to how much skin cleansers can reduce the burden on the skin when used in the same way as before. For this reason, it is thought that skin cleansers need to be less irritating than ever before, so that they can be used on sensitive skin such as after sunburn. Furthermore, for inflamed skin, it is necessary not only to keep it clean by cleansing, but also to suppress the redness caused by inflammation.

The present invention therefore aims to provide a skin cleansing composition that can be used in a different way than conventional methods and that can provide a pleasant cooling sensation.

The inventors came up with the innovative idea of spraying a skin cleanser composition directly onto the skin without lathering it beforehand, in order to further reduce skin irritation. They also discovered that by incorporating an amphiphilic ester into the surfactant, effective cleansing power can be achieved without lathering it beforehand, and that by further incorporating a cooling sensation component, a pleasant cooling sensation can also be imparted. The present invention was completed through further investigation based on this finding.

That is, the present invention provides the following aspects.
Item 1. A skin cleansing spray agent that contains (A) a surfactant, (B) an amphiphilic ester, and (C) a cooling sensation component, and is contained in a spray container.
Item 2. The skin cleansing spray according to Item 1, wherein the spray container is a pump-type spray container.
Item 3. The skin cleansing spray according to Item 1, wherein the spray container is an aerosol spray container.
Item 4. The skin cleansing spray according to any one of Items 1 to 3, wherein the component (B) is selected from the group consisting of dicarboxylic acid bis(polyoxyalkylene alkyl ether) esters, dicarboxylic acid dialkoxyalkyl esters, and polyglyceryl-10 (eicosanedioate/tetradecanedioate).
Item 5. The skin cleansing spray according to any one of Items 1 to 4, wherein the dicarboxylic acid bis(polyoxyalkylene alkyl ether) ester is cyclohexane-1,4-dicarboxylic acid bisethoxydiglycol.
Item 6. The skin cleansing spray according to any one of items 1 to 5, wherein the content of component (A) is 0.025 to 2% by weight.
Item 7. The skin cleansing spray according to any one of Items 1 to 6, wherein the content of the component (A) is 0.025 to 0.9 wt %.
Item 8. The skin cleansing spray according to any one of Items 1 to 7, wherein the component (C) is menthol and/or menthyl succinate.
Item 9. The skin cleansing spray according to any one of Items 1 to 8, wherein the content of the component (C) is 0.001 to 0.5 wt %.
Item 10. The skin cleansing spray according to any one of Items 1 to 9, which is applied to sunburned skin.

The present invention allows the skin cleansing composition to exhibit excellent cleansing power while reducing skin irritation, thereby providing a new application in which the skin cleansing composition is sprayed directly onto the skin, unlike conventional applications in which the composition is foamed before application. Because cleansing is possible without foaming, the amount of surfactant contained in the skin cleansing liquid composition can be significantly reduced compared to the amount contained in conventional skin cleansing liquid compositions, thereby further reducing skin irritation. In addition, because the composition can impart a pleasant cooling sensation while reducing skin irritation, it can be suitably used to cleanse skin that has become sensitive and hot due to inflammation that has reduced its barrier function and moisture retention ability, such as after sunburn.

The skin cleansing spray of the present invention is characterized by containing (A) a surfactant (hereinafter sometimes referred to as component (A)), (B) an amphiphilic ester (hereinafter sometimes referred to as component (B)), and (C) a cooling sensation component (hereinafter sometimes referred to as component (C)), and is contained in a spray container. The skin cleansing spray of the present invention is described in detail below.

(A) Surfactant The skin cleansing spray of the present invention contains a surfactant as component (A). The surfactant is not particularly limited, but from the viewpoint of suppressing irritation to the skin, preferred examples include anionic surfactants, nonionic surfactants, amphoteric surfactants, and natural surfactants. As the surfactant, one type from among anionic surfactants, nonionic surfactants, amphoteric surfactants, and natural surfactants may be used alone, or two or more types may be used in any combination.

Examples of anionic surfactants that can be used in the present invention include carboxylic acid, sulfonic acid, sulfate, and phosphate surfactants.

Specific examples of carboxylic acid surfactants include saturated or unsaturated fatty acids having 6 to 22 carbon atoms, such as octanoic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, and stearic acid; and N-acylamino acids (carboxylic acid amino acid anionic surfactants) having saturated or unsaturated N-acyl groups having 8 to 24 carbon atoms, such as octanoyl, decanoyl, lauroyl, myristoyl, palmitoyl, and cocoyl groups. Examples of N-acylamino acids in carboxylic acid amino acid anionic surfactants include N-acylsarcosine, N-acylaspartic acid, N-acylglutamic acid, and lauroylmethyl-β-alanine. More specific examples of carboxylic acid amino acid anionic surfactants include N-lauroylsarcosine, N-lauroylaspartic acid, cocoylglutamic acid, and sodium lauroylmethyl-β-alanine.

Specific examples of sulfonic acid surfactants include esters of isethionic acid and fatty acids having 6 to 22 carbon atoms, such as cocoyl isethionic acid; alkylsulfonic acids having 6 to 22 carbon atoms, such as hexanesulfonic acid, octanesulfonic acid, decanesulfonic acid, and dodecanesulfonic acid; alkylbenzenesulfonic acids having an alkyl group having 10 to 16 carbon atoms, such as alkylbenzenesulfonic acid; and N-acyl-N-methyltaurine (sulfonic acid amino acid anionic surfactants) having saturated or unsaturated N-acyl groups having 8 to 24 carbon atoms, such as octanoyl, decanoyl, lauroyl, myristoyl, palmitoyl, and cocoyl groups. More specific examples of sulfonic acid amino acid anionic surfactants include N-myristoyl-N-methyltaurine, N-lauroylmethyltaurine, and cocoylmethyltaurine.

Specific examples of sulfate ester surfactants include esters of saturated or unsaturated fatty acids with 10 to 22 carbon atoms and sulfate, such as lauryl sulfate and myristyl sulfate. Specific examples of phosphate ester surfactants include esters of saturated or unsaturated fatty acids with 8 to 24 carbon atoms and phosphoric acid, such as lauryl phosphate.

These anionic surfactants may be in the form of a salt, such as an alkali metal salt such as a sodium salt or potassium salt; a triethanolamine (TEA) salt; or an ammonium salt.

Among these anionic surfactants, from the viewpoint of achieving better skin irritation reduction and cleansing power, preferred are carboxylic acid surfactants and sulfonic acid surfactants, more preferred are lauric acid, N-lauroyl aspartic acid, cocoyl glutamic acid, cocoyl methyl taurine, and salts thereof, and even more preferred are sodium laurate, sodium N-lauroyl aspartate, triethanolamine cocoyl glutamate, and sodium cocoyl methyl taurine. Furthermore, among these, from the viewpoint of achieving even better skin irritation reduction, preferred are N-acyl glutamic acids having a saturated or unsaturated acyl group with 8 to 24 carbon atoms, and fatty acid amide sulfonic acids having 8 to 22 carbon atoms, and salts thereof; more preferred are cocoyl glutamic acid, cocoyl methyl taurine, and salts thereof; even more preferred are triethanolamine cocoyl glutamate and sodium cocoyl methyl taurate; and from the viewpoint of achieving even better cleansing power, preferred are N-acylaspartic acids having a saturated or unsaturated acyl group with 8 to 24 carbon atoms, more preferred are N-lauroylaspartic acid, and even more preferred is sodium N-lauroylaspartate.

These anionic surfactants may be used alone or in combination of two or more.

Examples of nonionic surfactants that can be used in the present invention include ester-type, ether-type, ester-ether-type, alkanolamide-type, alkylglycoside-type, and alcohol-type surfactants.

Specific examples of ester-type surfactants include mono- or diesters of saturated or unsaturated fatty acids having 8 to 20 carbon atoms and glycerin, such as glycol dilaurate, glycol monostearate, glycol distearate, glyceryl monolaurate, glyceryl dilaurate, glyceryl monostearate, and glyceryl distearate; sorbitan fatty acid esters; and sucrose fatty acid esters.

Specific examples of ether-type surfactants include polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, and polyoxyethylene polyoxypropylene glycols.

Examples of ester/ether surfactants include polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene hexitane fatty acid ester, and sorbitan fatty acid ester polyethylene glycol.

Specific examples of alkanolamide surfactants include cocamide DEA (coconut oil fatty acid diethanolamide), lauric acid diethanolamide, oleic acid diethanolamide, and stearic acid diethanolamide.

Specific examples of alkyl glycoside surfactants include octyl glucoside, decyl glucoside, and lauryl glucoside.

Examples of alcohol-based surfactants include cetanol, stearyl alcohol, and oleyl alcohol.

Of these nonionic surfactants, from the viewpoint of achieving better skin irritation reduction and cleaning power, preferred are ester/ether type surfactants and alkanolamide type surfactants, more preferred are polyoxyethylene hydrogenated castor oil and cocamide DEA, and even more preferred is polyoxyethylene hydrogenated castor oil.

These nonionic surfactants may be used alone or in combination of two or more.

Examples of amphoteric surfactants that can be used in the present invention include alkyl betaine, fatty acid amidopropyl betaine, and amine oxide surfactants.

Specific examples of alkyl betaine surfactants include lauryl dimethyl amino acetic acid betaine, stearyl dimethyl amino acetic acid betaine, and octadecyl aminomethyl dimethyl sulfopropyl betaine.

Specific examples of fatty acid amidopropyl betaine-type amphoteric surfactants include amidobetaines (amino acid-based amphoteric surfactants) such as cocamidopropyl betaine, and sulfobetaines such as cocamidopropyl hydroxysultaine.

Specific examples of amine oxide amphoteric surfactants include lauryl dimethylamine N-oxide and oleyl dimethylamine N-oxide.

These amphoteric surfactants may be in the form of a salt, such as an alkali metal salt such as a sodium salt or potassium salt; a triethanolamine (TEA) salt; or an ammonium salt.

Among these amphoteric surfactants, fatty acid amidopropyl betaine surfactants are preferred, from the viewpoint of reducing skin irritation and achieving better cleansing power, more preferably amidobetaines (amino acid-based amphoteric surfactants) such as cocamidopropyl betaine, and even more preferably cocamidopropyl betaine.

These amphoteric surfactants may be used alone or in combination of two or more.

Natural surfactants that can be used in the present invention include lecithin and lysolecithin; and saponins such as quillaja saponin, soybean saponin, yucca saponin, soybean saponin, beet saponin, adzuki bean saponin, carrot saponin, tea seed saponin, loofah saponin, and Centella asiatica saponin.

Lecithin is a mixture of phospholipids such as phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and phosphatidylinositol, as well as components such as triglycerides, fatty acids, and carbohydrates from vegetable oils, and is a well-known ingredient in pharmaceuticals, quasi-drugs, and cosmetics.

Lecithin may be natural lecithin derived from animals or plants (e.g., soybean lecithin, egg yolk lecithin, etc.), chemically processed natural lecithin, or purified natural lecithin. Chemically processed natural lecithin includes hydrogenated lecithin obtained by hydrogenation (e.g., fully hydrogenated lecithin and partially hydrogenated lecithin), and hydroxylated lecithin obtained by hydroxylation. Purified natural lecithin includes lecithin with an increased phosphatidylcholine content using a solvent such as acetone.

Lysolecithin includes the lyso forms of the above-mentioned lecithins (natural lecithin, chemically processed natural lecithin, and purified natural lecithin). Lysolecithin has a structure in which the fatty acid at the second position of phosphatidylcholine has been removed by hydrolysis (dissolution) of lecithin with an enzyme such as phospholipase A2.

Of these natural surfactants, from the viewpoint of achieving better skin irritation reduction and cleansing power, lecithin, lysolecithin, and saponin are preferred, lecithin and lysolecithin are more preferred, and lysolecithin is even more preferred.

These natural surfactants may be used alone or in combination of two or more.

The content of component (A) in the skin cleansing spray of the present invention is not particularly limited and can be determined appropriately depending on the desired cleansing power. Because the skin cleansing spray of the present invention is capable of cleansing without exerting physical friction on the skin, the amount of surfactant in the skin cleansing spray can be significantly reduced compared to the amount contained in conventional skin cleansing liquid compositions, and effective cleansing power can be achieved even with a small amount of surfactant that would not normally provide effective cleansing power. From this perspective, the content of component (A) in the skin cleansing spray of the present invention is preferably 0.025 to 2% by weight. Furthermore, from the perspective of further suppressing skin irritation and a feeling of tightness due to insufficient moisture retention, the upper limit of the above content range of component (A) is 1.5% by weight or less, preferably 1% by weight or less, more preferably 0.9% by weight or less, even more preferably 0.6% by weight or less, and even more preferably 0.2% by weight or less. On the other hand, from the viewpoint of achieving even better detergency, the lower limit of the range of the content of component (A) is preferably 0.1% by weight or more, more preferably 0.5% by weight or more, even more preferably 1.5% by weight or more, and particularly preferably 1.8% by weight or more.

The skin cleansing spray of the present invention contains an amphiphilic ester as component (B). Component (B) does not exhibit cleansing action alone, but by coexisting with component (A), the cleansing power of the skin cleansing spray can be improved while maintaining low irritation.

In the present invention, the amphiphilic ester dissolves at least 2% by mass at room temperature in ion-exchanged water adjusted to a conductivity of 70 to 110 μs/m, as measured by the method specified in the general testing methods of the Japanese Pharmacopoeia, and dissolves at least 10% by mass in the oil isotridecyl isononanoate (Salacos 913, manufactured by The Nisshin Oillio Group, Ltd.) at room temperature (25°C). Ester surfactants are excluded.

The amphiphilic ester is not particularly limited, but from the viewpoint of achieving better skin irritation reduction and cleaning power, it is preferable that it be selected from the group consisting of dicarboxylic acid bis(polyoxyalkylene alkyl ether) esters, dicarboxylic acid dialkoxyalkyl esters, and polyglyceryl-10 (eicosandioate/tetradecanedioate). As the amphiphilic ester, any one of dicarboxylic acid bis(polyoxyalkylene alkyl ether) esters, dicarboxylic acid dialkoxyalkyl esters, and polyglyceryl-10 (eicosandioate/tetradecanedioate) may be used alone, or two or more may be used in combination. Among these amphiphilic esters, dicarboxylic acid bis(polyoxyalkylene alkyl ether) esters are more preferable from the viewpoint of achieving better skin irritation reduction and cleaning power.

The dicarboxylic acid bis(polyoxyalkylene alkyl ether) ester used in the present invention is a diester compound of a dicarboxylic acid and a polyoxyalkylene alkyl ether. Specific examples of the dicarboxylic acid constituting the diester compound of the dicarboxylic acid bis(polyoxyalkylene alkyl ether) ester include oxalic acid, malonic acid, succinic acid, tartaric acid, malic acid, glutaric acid, adipic acid, pemelic acid, suberic acid, azelaic acid, sebacic acid, aspartic acid, glutamic acid, acetone dicarboxylic acid, phthalic acid, and cyclohexane-1,4-dicarboxylic acid. Furthermore, examples of the polyoxyalkylene alkyl ether constituting the diester compound include polyoxyethylene monoalkyl ethers, and more specifically, examples include diethylene glycol monoethyl ether and triethylene glycol monoethyl ether.

Among these dicarboxylic acid bis(polyoxyalkylene alkyl ether) esters, from the viewpoint of obtaining better skin irritation reduction properties and detergency, preferred are diester compounds of cyclohexane-1,4-dicarboxylic acid and diethylene glycol monoethyl ether, specifically a compound called cyclohexane-1,4-dicarboxylic acid bisethoxydiglycol, which is represented by the INCI name (International Cosmetic Ingredient Dictionary and Handbook, 13th Edition, Vol. 1, CTFA, 2010, p. 331): BIS-ETHOXYDIGLYCOL CYCLOHEXANE 1,4-DICARBOXYLATE, and diester compounds of succinic acid and diethylene glycol monoethyl ether, specifically a compound called cyclohexane-1,4-dicarboxylic acid bisethoxydiglycol, which is represented by the INCI name (International Cosmetic Ingredient Dictionary and Handbook, 13th Edition, Vol. 1, CTFA, 2010, p. 331): BIS-ETHOXYDIGLYCOL CYCLOHEXANE 1,4-DICARBOXYLATE. Dictionary and Handbook, 13th Edition, Vol. 1, CTFA, 2010, pp. 331-332): Examples include a compound called bisethoxydiglycol succinate, which is represented as BIS-ETHOXYDIGLYCOL SUCCINATE, and more preferably bisethoxydiglycol cyclohexane-1,4-dicarboxylate.

In the present invention, specific examples of the bisethoxydiglycol cyclohexane-1,4-dicarboxylate include "Neosolue-Aquilio (trade name)" manufactured by Nippon Fine Chemical Co., Ltd. In addition, specific examples of the bisethoxydiglycol succinate include "HiAquostar DCS (trade name)" manufactured by Kokyu Alcohol Kogyo Co., Ltd.

These dicarboxylic acid bis(polyoxyalkylene alkyl ether) esters may be used alone or in combination of two or more.

The dicarboxylic acid dialkoxyalkyl ester used in the present invention is a diester compound of a dicarboxylic acid and an alkoxy alcohol. Specific examples of the dicarboxylic acid that constitutes the diester compound of the dicarboxylic acid dialkoxyalkyl include oxalic acid, malonic acid, succinic acid, tartaric acid, malic acid, glutaric acid, adipic acid, pemelic acid, suberic acid, azelaic acid, sebacic acid, aspartic acid, glutamic acid, acetonedicarboxylic acid, phthalic acid, and cyclohexane-1,4-dicarboxylic acid. Furthermore, examples of the alkoxy alcohol that constitutes the diester compound include 2-methoxyethanol and 2-ethoxyethanol.

Of these dicarboxylic acid dialkoxyalkyl esters, from the viewpoint of achieving better skin irritation reduction and cleaning power, preferred is a diester compound of succinic acid and 2-ethoxyethanol, specifically diethoxyethyl succinate.

These dicarboxylic acid dialkoxyalkyl esters may be used alone or in combination of two or more.

The polyglyceryl-10 (eicosanedioate/tetradecanedioate) used in the present invention is not particularly limited, but examples include "Neosolue-Aqua (trade name)" and "Neosolue-AquaS (trade name)" manufactured by Nippon Fine Chemical Co., Ltd.

The content of component (B) in the skin cleansing spray of the present invention is not particularly limited, but may be, for example, 0.1% by weight or more. From the viewpoint of obtaining even better cleansing power and/or further reducing the feeling of tightness due to insufficient moisturizing, the content of component (B) is preferably 0.5% by weight or more, more preferably 1.5% by weight or more, and more preferably 3% by weight or more. The upper limit of the range of the content of component (B) is not particularly limited, but from the viewpoint of stability, such as suppressing precipitation after high-temperature storage of the skin cleansing spray, the content may be, for example, 5% by weight or less, preferably 4% by weight or less, more preferably 2% by weight or less, even more preferably 1.2% by weight or less, and even more preferably 1% by weight or less.

In the skin cleansing spray of the present invention, the ratio of component (A) to component (B) is not particularly limited and is determined by the respective contents described above. However, from the viewpoint of achieving better skin irritation reduction and cleaning power, for example, 0.1 to 100 parts by weight of component (B) per 1 part by weight of component (A) is preferred. Furthermore, from the viewpoint of achieving even better cleaning power when the amount of component (A) is as small as about 0.5 to 1.5% by weight, the ratio of component (B) per 1 part by weight of component (A) is preferably 2 to 100 parts by weight, preferably 2.5 to 50 parts by weight, and more preferably 3 to 10 parts by weight. Furthermore, from the viewpoint of further reducing the feeling of tightness due to insufficient moisture, the ratio of component (B) per 1 part by weight of component (A) is preferably 2 to 100 parts by weight, more preferably 2.5 to 90 parts by weight, and even more preferably 3 to 80 parts by weight.

(C) Cooling Sensation Component The skin cleansing spray of the present invention contains a cooling sensation component as component (C). The cooling sensation component is not particularly limited as long as it is a component that provides a cooling sensation, and examples thereof include menthol, cineol, menthanediol, menthyl lactate, menthyl succinate, menthyl glyceryl ether, menthyl ethylaminooxalic acid, menthyl pyrrolidone carboxylic acid, menthyl succinate, menthyl glutarate, ethyl menthane carboxamide, menthanecarbonylglycine ethyl ester, menthone, menthone glycerin acetal, 2-sec-butylcyclohexanone, isopulegol, pulegol, N,2,3-trimethyl-2-isopropylbutanamide, thymol, eugenol, anethole, methyl salicylate, camphor, spilanthol, trimethylcyclohexanol, and 3-menthoxy-2-methylpropane-1,2-diol. These cooling sensation components may be used alone or in any combination of two or more.

Among these cooling ingredients, menthol and menthyl succinate are preferred from the viewpoint of more effectively obtaining a pleasant cooling sensation, and a combination of menthol and menthyl succinate is preferred from the viewpoint of prolonging the cooling sensation.

Menthol may be in the d-, l-, or dl-form, but the l- and dl-forms are preferred, and the l-form is more preferred. Essential oils containing menthol may also be used as menthol.

Monomenthyl succinate is an ester of succinic acid and menthol. The menthol may be in the d-, l-, or dl-form, but is preferably the l- or dl-form, and more preferably the l-form.

The content of component (C) in the skin cleansing spray of the present invention may be determined appropriately depending on the cooling sensation to be imparted, and is not particularly limited. However, from the viewpoint of suppressing skin irritation caused by the cooling sensation component while imparting a pleasant cooling sensation, and from the viewpoint of stability such as suppressing unpleasant odors after high-temperature storage, for example, 0.001 to 0.5% by weight is preferred. From the viewpoint of obtaining an even more pleasant cooling sensation, the content of component (C) is preferably 0.01 to 0.5% by weight, more preferably 0.1 to 0.5% by weight. From the viewpoint of further suppressing skin irritation caused by the cooling sensation component or obtaining better stability after high-temperature storage, the content is preferably 0.001 to 0.3% by weight, more preferably 0.001 to 0.2% by weight.

Other Components In addition to the above-mentioned components, the skin cleansing spray of the present invention may contain other bases and additives required for formulation, etc., within the scope that does not impair the effects of the present invention. Such additives are not particularly limited as long as they are pharmaceutically acceptable, and examples thereof include aqueous bases such as water, lower alcohols having 1 to 5 carbon atoms (ethanol, isopropanol, etc.), and polyhydric alcohols (ethylene glycol, 1,3-butylene glycol (1,3-BG), propylene glycol, isoprene glycol, diethylene glycol, dipropylene glycol, polypropylene glycol, glycerin, etc.); preservatives (phenoxyethanol, methylparaben, propylparaben, benzoic acid, sodium benzoate, sorbic acid, etc.), flavoring agents (citral, citronellal, farnesol, etc.), coloring agents (tar dyes (Brown No. 201, Blue No. 201, Yellow No. 4, Yellow No. 403, etc.), cocoa dyes, chlorophyll, aluminum oxide, etc.), thickeners (hydroxypropyl cellulose, hydroxyethyl cellulose, cross-linked acrylic acid polymers, carboxyvinyl polymers, hypromellose, etc.), and the like. , polyvinylpyrrolidone, sodium alginate, ethyl cellulose, sodium carboxymethylcellulose, xanthan gum, carrageenan, etc.), pH adjusters (phosphoric acid, hydrochloric acid, citric acid, sodium citrate (trisodium citrate), succinic acid, tartaric acid, sodium hydroxide, potassium hydroxide, triethanolamine, triisopropanolamine, etc.), wetting agents (sodium dl-pyrrolidonecarboxylate solution, D-sorbitol solution, macrogol, etc.), stabilizers (dibutylhydroxytoluene, butylhydroxyanisole, sodium edetate, sodium metaphosphate, L-arginine, L-aspartic acid, DL-alanine, glycine, sodium erythorbate, propyl gallate, sodium sulfite, sulfur dioxide, chlorogenic acid, catechin, rosemary extract, etc.), antioxidants, ultraviolet absorbers, chelating agents, adhesives, buffers, solubilizers, solubilizers, preservatives, etc. These substrates and additives may be used alone or in combination of two or more. The content of these base materials and additives can be appropriately set depending on the formulation form, etc.

In addition to the above-mentioned components, the skin cleansing spray of the present invention may contain other pharmacological ingredients as needed, provided that the effects of the present invention are not impaired. Examples of such pharmacological ingredients include vitamins (vitamins A, B1, B2, B5, B6, B12, C, D, K, niacin, folic acid, biotin, lycopene, etc.), antihistamines (diphenhydramine, diphenhydramine hydrochloride, etc.), local anesthetics (procaine, tetracaine, bupivacaine, mepivacaine, chloroprocaine, proparacaine, meprylcaine or salts thereof, orthocaine, oxethazaine, oxypolyene, etc.), and the like. Examples of pharmacological ingredients include thoxydecane, Scopolia extract, percaminpase, tesitdesitin, etc.), anti-inflammatory agents (indomethacin, felbinac, diclofenac sodium, loxoprofen sodium, etc.), skin protectants (collodion, castor oil, etc.), blood circulation promoting ingredients (vanillyl nonylate amide, nicotinic acid benzyl ester, capsaicin, chili pepper extract, etc.), mucopolysaccharides (sodium chondroitin sulfate, glucosamine, hyaluronic acid, cationized hyaluronic acid (dihydroxypropyltrimonium hyaluronate, etc.), etc.). These pharmacological ingredients may be used alone or in combination of two or more. When these pharmacological ingredients are included, the amount may be appropriately determined depending on the type of pharmacological ingredient used, the desired effect, etc.

The skin cleansing spray of the present invention is in the form of a liquid or gel at room temperature. The viscosity of the skin cleansing spray of the present invention is 10,000 mPa s or less, preferably 5,000 mPa s or less, at 20°C. The viscosity is measured using a BL viscometer (rotor No. 3, 6 rpm, 20°C).

The container for storing the skin cleansing spray of the present invention is not particularly limited, as long as it is a spray container. The spray container in the present invention discharges the contents in the form of a mist, and is different from a pump-former container that discharges the skin cleanser composition in the form of a foam.

In the present invention, by storing the skin cleansing spray in a spray container in this manner, the skin cleansing spray is applied directly to the skin by spraying, without the need for foaming before application. This makes application to the skin easy and avoids physical friction with the hands, etc., during application. Spray containers include pump spray containers, which are non-aerosol spray containers, and aerosol spray containers. The nozzle diameter (nozzle inner diameter) of the spray container is, for example, 0.01 to 3 mmφ, preferably 0.1 to 1 mmφ. When the spray container is a pump spray container, the amount sprayed per push is, for example, 0.05 to 1.2 g, preferably 0.1 to 0.3 g.

The skin cleansing spray of the present invention is used to remove oils, sweat, and other body fluids, dirt , and the like from the skin, and is not used as a makeup remover (cleanser). The skin cleansing spray of the present invention is used by applying it directly to the skin without diluting it with water or lathering it. The amount used per application depends on the concentration of the surfactant and the level of dirt, but for example, when used for face washing, it is 0.5 to 3 g, preferably 1 to 2 g.

More specifically, the skin cleansing spray can be sprayed directly onto the area to be cleaned from a spray container without the need for handwashing. By directly applying the skin cleansing spray to the area to be cleaned in this way, cleansing becomes possible simply by utilizing the mechanical force of the liquid flow, without any physical friction, such as friction between the skin of the area to be cleaned and the hands, or between the skin of the area to be cleaned and air bubbles. Because the skin cleansing spray of the present invention is formulated for excellent cleansing power, cleaning using the mechanical force of the liquid flow without physical friction significantly reduces the burden on the skin during cleansing, enabling an extremely gentle cleansing method. This type of foam-free cleansing method allows for quick cleansing, is easy to appreciate as it uses less surfactants and is gentle on the skin, and is likely to satisfy consumers who are conscious of pursuing gentle cleansing. While the skin cleansing spray of the present invention is particularly suited to cleansing methods that do not impart physical friction to the skin, as described above, this does not exclude uses in which the skin cleansing spray is applied to the area to be cleaned and then scrubbed with hands, etc.

The area to be cleaned with the skin cleansing spray of the present invention is not particularly limited, as any body part can be cleansed, and examples include hands, hair, scalp, body, and face. Because the skin cleansing spray of the present invention is applied to the area to be cleaned by spraying, it is suitable for use on hair, scalp, and body from the standpoint of ease of application. Furthermore, because the skin cleansing spray of the present invention can exert excellent cleansing power without pre-lathering, it is suitable for use on the face, which is sensitive to irritants. Furthermore, the skin cleansing spray of the present invention is particularly suitable for skin conditions to be cleaned, such as skin with a weakened barrier function, skin with a weakened moisture retention ability, and skin that is hot. Preferred examples of skin with a weakened barrier function, a weakened moisture retention ability, and skin that is hot include inflamed skin, and even more preferred examples include skin after sunburn.

After washing, the skin cleansing spray can be rinsed off with water. When rinsing with water, you can do so in the same way as you would normally wash your face, but from the perspective of reducing the burden on the skin, it is preferable to use the mechanical force of a water stream to rinse off the product without causing friction with your hands.

Furthermore, since the surfactant concentration of the skin cleansing spray of the present invention can be made extremely low, in this case it does not need to be rinsed off after cleansing. Therefore, the skin cleansing spray of the present invention is also suitable for use in wiping in hospitals, for skin cleansing treatments such as face washing in beauty salons and hairdressers, and as a disaster relief item. If it is not rinsed off, any skin cleansing spray remaining on the cleansed area can be absorbed and removed using a water-absorbent substrate such as a towel or tissue.

The skin cleansing spray of the present invention is produced by mixing the aforementioned components (A), (B), and (C) and other components that are blended as necessary, preparing the mixture into a predetermined form, and then storing the mixture in a spray container. When the spray container is an aerosol spray container, the mixture is stored together with a propellant such as a gas before production.

The present invention will be explained in more detail below using examples, but the present invention is not limited to these examples.

[Reference test example]
Skin cleansing spray agents were prepared with the compositions shown in Tables 1 to 4. Details of each component shown in Tables 1 to 4 are as follows. The skin cleansing spray agents shown in Tables 1 to 4 were liquid, and their viscosities at 20°C (measured using a BL viscometer (Brookfield B-type viscometer) rotor No. 3, 6 rpm) were all in the range of 5000 mPa s or less.
Sodium laurate (NOF Corporation "NonSal LN-1" (product name))
- TEA-cocoyl glutamate (Amisoft CT-12S (product name) manufactured by Ajinomoto Co., Inc.)
- Sodium methyl cocoyl taurate ("Diapon K-SF (product name)" manufactured by NOF Corporation)
Sodium N-lauroyl aspartate solution (20% by weight) ("Amino Former FLDS-L (product name)" manufactured by Asahi Kasei Fine Chemical Corporation)
Polyoxyethylene lauryl ether acetate ("Kao Akipo RLM-45 (product name)" manufactured by Kao Corporation)
Cocamide DEA ("Amizol CDE-G (trade name)" manufactured by Kawaken Fine Chemicals Co., Ltd.)
PEG-60 hydrogenated castor oil (polyoxyethylene hydrogenated castor oil; "NIKKOL HCO-60 (trade name)" manufactured by Nikko Chemicals Co., Ltd.)
- Polyoxyethylene sorbitan monostearate (Kao Corporation, Rheodor TW-S120V)
Glycerin mono-2-ethylhexyl ether (SEPPIC "Sensiva"
SC 50 JP (product name)”)
Cocamidopropyl betaine ("Softazoline CPB (trade name)" manufactured by Kawaken Fine Chemicals Co., Ltd.)
Lauryl hydroxysulfobetaine solution (30% by weight) ("Amphitol 20HD (product name)" manufactured by Kao Corporation)
Lysolecithin ("Lysolecithin Kyowa (product name)" manufactured by Kyowa Hakko Bio Co., Ltd.)
Quillaja extract (Maruzen Pharmaceuticals' Quillaja Extract BG, saponin content 5% by weight)
Cyclohexane-1,4-dicarboxylic acid bisethoxydiglycol ("Neosolue-Aquilio (trade name)" manufactured by Nippon Fine Chemical Co., Ltd.)
Bisethoxydiglycol succinate ("HiAquostar DCS (product name)" manufactured by Kokyu Alcohol Kogyo Co., Ltd.)

<Cleaning power evaluation>
The prepared skin cleansing sprays were evaluated for cleansing power by 10 expert cosmetic evaluation panelists. Specifically, each skin cleansing spray was placed in a pump-type spray container ("Z-155-C110 (trade name)" manufactured by Takemoto Container Co., Ltd., spraying 0.15 g per pump), and 1.5 g was applied by spraying directly onto the face. The spray was left for about 5 seconds, and then the subject rinsed with water without touching their hands to their face. After holding a towel over their face to absorb the water, the feeling of skin cleansing was evaluated by sensory evaluation and scored based on the following criteria.

5 points: Dirt was thoroughly removed 4 points: Dirt was removed 3 points: Neither 2 points: Dirt was not removed very much 1 point: Dirt was not removed at all

The scores obtained by the 10 panelists were totaled and the degree of detergency was evaluated according to the following classification. The results are shown in Tables 1 to 4.
◎: 45 points or more
○: 40 points or more and less than 45 points
△: 35 points or more and less than 40 points
×: Less than 35 points

<Evaluation of tightness>
The prepared skin cleansing sprays were evaluated for their feeling of tightness by 10 expert cosmetic evaluation panelists. Specifically, each skin cleansing spray was placed in a pump-type spray container ("Z-155-C110 (trade name)" manufactured by Takemoto Container Co., Ltd. (amount sprayed per pump is 0.15 g)) and 1.5 g was applied by spraying directly onto the face. The spray was left for about 5 seconds, and then the subject rinsed with water without touching their hands to their face. After holding a towel over their face to absorb the water, the feeling of tightness was evaluated by sensory evaluation and scored based on the following index. The stronger the feeling of tightness, the more insufficient moisture was indicated.

5 points: No tightness at all 4 points: Almost no tightness 3 points: Only a slight tightness 2 points: Some tightness 1 point: Very strong tightness

The scores obtained by the 10 panelists were totaled, and the degree of tightness was evaluated according to the following classification. The results are shown in Tables 3 and 4.
◎: 45 points or more
○: 40 points or more and less than 45 points
△: 35 points or more and less than 40 points
×: Less than 35 points

<Cooling sensation evaluation>
The prepared skin cleansing sprays were evaluated for cooling sensation by 10 subjects who had spent time outdoors during the daytime during a period of strong ultraviolet rays without using sunscreen and whose skin had become sunburned and hot. Specifically, each skin cleansing spray was placed in a pump-type spray container ("Z-155-C110 (trade name)" manufactured by Takemoto Container Co., Ltd. (amount sprayed per pump was 0.15 g) and 5 g was applied by spraying directly onto the entire body. After leaving it for about 5 seconds, the subjects rinsed it off with water without touching their hands to the skin. After holding the skin with a towel to absorb the water, the cooling sensation was evaluated by sensory evaluation and scored based on the following criteria.

3 points: Feels a very comfortable cool sensation 2 points: Feels a comfortable cool sensation 1 point: Feels a slight cool sensation 0 points: Feels no cool sensation and is uncomfortable

The scores obtained by the 10 subjects were totaled and averaged, and the degree of cooling sensation was evaluated according to the following classification. The results are shown in Tables 1 to 4.
◎: 2.5 points or more
○: 1.5 points or more and less than 2.5 points
△: 0.5 points or more and less than 1.5 points
×: Less than 0.5 points

<Cultured epidermis skin irritation test (in vitro evaluation of skin irritation)>
The prepared skin cleansing spray was subjected to a cultured epidermis skin irritation test as follows.
1. Preparation of the cultured epidermal model LabCyte EPI-MODEL 24 The assay medium was warmed and added in 0.5 mL portions to a 24-well assay plate. The cultured epidermal model LabCyte EPI-MODEL 24 (lot number: LCE24-180226-A) was transferred to the 24-well assay plate containing the assay medium. After confirming that there were no air bubbles on the bottom of the culture cup, the plate was placed in a _CO2 incubator and left to stand for at least 1 hour before exposure to the test substance.

2. Application of Test Substances and Washing Twelve of the 24 epidermal models were used (the remaining models continued pre-culture until the main test). The 24-well assay plate was removed from the _CO2 incubator. The assay medium was warmed and added at 1.0 mL per well to the third row of the 24-well assay plate. 25 μL of the test substance (each skin cleansing spray) was dropped onto the cultured epidermis in the culture cup without using a pump-type spray container, and the entire surface was exposed to the test substance. 1, 5, and 10 minutes after exposure, the test substance was removed by suction, and the cultured epidermal model in the cup was washed with phosphate buffer solution (PBS) and transferred to the third row of the 24-well assay plate.

3. MTT test The MTT test was carried out to measure the amount of MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] taken up into cells.
This method measures cell viability by extracting the formazan dye produced by reduction of [C1H2O3] by mitochondrial dehydrogenase in the cells with an organic solvent and measuring the absorbance at 570 nm.

10 mL of MTT medium was prepared at a final concentration of 0.5 mg/mL. The MTT medium was warmed and added in 0.5 mL portions to the fourth row of a 24-well assay plate. The cultured epidermal model was transferred to the fourth row of the 24-well assay plate and placed in a CO2 incubator for 3 hours to allow the MTT reaction to proceed. After the MTT reaction was complete, the cultured skin was removed with tweezers and transferred to a 1.5 mL microtube. 300 μL of isopropanol was added to the microtube to completely immerse the cultured epidermal model. After leaving the tube for 2 hours, the microtube was vortexed to extract the pigment. 200 mL of the extract was added to each well of a 96-well plate. 200 μL of isopropanol was added to A1 as a blank (negative control). The absorbance at 570 nm and 650 nm was measured using a microplate reader. The measured value was the absorbance at 570 nm minus the absorbance at 650 nm, and the viability of the test substance was calculated using the following formula.

The viable cell rate was classified based on the following criteria, and skin irritation was evaluated. The results are shown in Tables 3 and 4.
◎: 90% or more
○: 75% or more and less than 90%
△: 65% or more and less than 75%
×: 50% or more but less than 65% ××: Less than 50%

As shown in Tables 1 to 4, no cleansing power was observed in the skin cleansing sprays (Reference Comparative Examples 1 to 10) containing surfactant alone at a concentration of 0.025 to 2% by weight. In contrast, the skin cleansing sprays (Reference Examples 1 to 20) containing amphiphilic esters (Reference Comparative Examples 11 to 15), which do not exhibit cleansing power alone, together with 0.025 to 2% by weight of surfactant, provided excellent cleansing power simply by spraying directly onto the skin from the spray container, using the mechanical force of the liquid flow without any physical friction. In other words, it was demonstrated that gentle cleansing is possible.

As shown in Reference Examples 1 to 3, even skin cleansing sprays containing more than 2% by weight of surfactant alone can achieve excellent cleansing power simply by spraying them directly onto the skin. However, taking into account the skin irritation caused by the surfactant concentration shown in Reference Examples 1 to 3, setting the surfactant concentration to 2% by weight or less, as shown in Reference Examples 9 to 20, not only achieved cleansing power but also excellent low irritation. In other words, it was demonstrated that by setting the surfactant concentration of a skin cleansing spray to be sprayed directly onto the skin to 0.025 to 2% by weight, it is possible to achieve a cleansing that is both physically and chemically gentle on the skin. However, none of the skin cleansing compositions of Reference Examples 1 to 20, Reference Comparative Examples 1 to 15, and Reference Examples 1 to 3 provided a comfortable cooling sensation.

[Test Example]
Skin cleansing sprays were prepared with the compositions shown in Tables 5 to 7. The details of each component shown in Tables 5 to 7 are as shown in the Reference Test Examples. 1-menthol was used as the menthol, and an ester of succinic acid and 1-menthol was used as the menthyl succinate. The skin cleansing sprays shown in Tables 5 to 7 were liquids, and their viscosities at 20°C (measured using a BL viscometer (Brookfield B-type viscometer) rotor No. 3, 6 rpm) were all in the range of 5000 mPa s or less.

<Cleaning power evaluation>
The prepared skin cleansing sprays were evaluated for cleansing power by 10 people who had spent time outdoors during the daytime during a period of strong ultraviolet rays without using sunscreen and whose skin was sunburned and hot. Specifically, each skin cleansing spray was placed in a pump-type spray container ("Z-155-C110 (trade name)" manufactured by Takemoto Container Co., Ltd., spray amount per pump: 0.15 g), and 5 g was applied by spraying directly onto the entire body. After leaving it for about 5 seconds, the person rinsed it off with water without touching their hands to the skin. After holding the skin with a towel to absorb the water, the feeling of dirt removal on the skin was scored by sensory evaluation based on the following index.
3 points: Dirt was thoroughly removed 2 points: Dirt was removed 1 point: Dirt was slightly removed 0 point: Dirt was not removed at all

The scores obtained by the 10 panelists were totaled and averaged, and the degree of detergency was evaluated according to the following classification. The results are shown in Tables 5 to 7.
◎: 2.5 points or more
○: 1.5 points or more and less than 2.5 points
△: 0.5 points or more and less than 1.5 points
×: Less than 0.5 points

<Irritation evaluation>
The prepared skin cleansing sprays were evaluated for irritation by 10 people who had spent time outdoors during the daytime during a period of strong ultraviolet rays without using sunscreen and whose skin had become sunburned and hot. Specifically, each skin cleansing spray was placed in a pump-type spray container ("Z-155-C110 (trade name)" manufactured by Takemoto Container Co., Ltd. (amount sprayed per pump was 0.15 g) and 5 g was applied by spraying directly onto the entire body. After leaving it for about 5 seconds, the subjects rinsed it off with water without touching their hands to the skin. After absorbing the water by pressing the skin with a towel, the irritation was evaluated by sensory evaluation and scored based on the following criteria.

3 points: No irritation felt at all 2 points: Only slight irritation felt 1 point: I felt irritation 0 point: I felt a strong irritation

The scores obtained by the 10 subjects were totaled and averaged, and the degree of irritation was evaluated according to the following classification. The results are shown in Tables 5 to 7.
◎: 2.5 points or more
○: 1.5 points or more and less than 2.5 points
△: 0.5 points or more and less than 1.5 points
×: Less than 0.5 points

<Evaluation of tightness>
The prepared skin cleansing sprays were evaluated for tightness by 10 people who had spent time outdoors during the daytime during a period of strong ultraviolet rays without using sunscreen and whose skin had become sunburned and hot. Specifically, each skin cleansing spray was placed in a pump-type spray container ("Z-155-C110 (trade name)" manufactured by Takemoto Container Co., Ltd. (amount sprayed per pump was 0.15 g) and 5 g was applied by spraying directly onto the entire body. After leaving it for about 5 seconds, the person rinsed with water without touching their hands to the skin. After holding the skin with a towel to absorb the water, the tightness was evaluated by sensory evaluation and scored based on the following index. The stronger the feeling of tightness, the more insufficient moisture was.

3 points: No tightness felt at all 2 points: Only slight tightness felt 1 point: Some tightness felt 0 point: Strong tightness felt

The scores obtained by the 10 subjects were totaled and averaged, and the degree of tightness was evaluated according to the following classification. The results are shown in Tables 5 to 7.
◎: 2.5 points or more
○: 1.5 points or more and less than 2.5 points
△: 0.5 points or more and less than 1.5 points
×: Less than 0.5 points

<Cooling sensation evaluation>
The prepared skin cleansing sprays were evaluated for the degree of cooling sensation in the same manner as in the Reference Test Example, and the results are shown in Tables 5 to 7.

<High temperature stability evaluation>
The prepared skin cleansing sprays were stored for one week at room temperature or 50°C. After storage, the differences in appearance and odor between the skin cleansing sprays stored at room temperature and those stored at 50°C were visually inspected, and the high-temperature stability was evaluated and scored based on the following indices. The differences in appearance and odor were evaluated by evaluating precipitation (specifically, precipitation of bisethoxydiglycol cyclohexane-1,4-dicarboxylate) and off-odor (specifically, off-odor due to menthol and menthyl succinate) in the skin cleansing sprays stored at 50°C.

3 points: No difference was observed 2 points: Only a slight difference was observed 1 point: A difference was observed 0 point: A large difference was observed

The scores obtained by the 10 people were totaled and averaged, and the degree of formulation stability was evaluated according to the following classification. The results are shown in Tables 5 to 7.
◎: 2.5 points or more
○: 1.5 points or more and less than 2.5 points
△: 0.5 points or more and less than 1.5 points
×: Less than 0.5 points

As shown in Tables 5 to 7, the skin cleansing spray containing only a surfactant (Comparative Example 1) did not exhibit any cleansing power because the surfactant concentration was too low. Furthermore, the skin cleansing spray containing an amphiphilic ester (Comparative Example 3), which does not exhibit cleansing power on its own, together with a surfactant (Comparative Example 2), even though the surfactant concentration was low, provided excellent cleansing power simply by spraying it directly onto the skin from a spray container, utilizing the mechanical force of the liquid flow without any physical friction. However, the cooling sensation was not pleasant for sunburned, hot skin. In contrast, the skin cleansing sprays (Examples 1 to 20), which contained an amphiphilic ester, which does not exhibit cleansing power on its own, together with a surfactant, and also contained a cooling component, provided excellent cleansing power, even though the surfactant concentration was low, simply by spraying it directly onto the skin from a spray container, utilizing the mechanical force of the liquid flow without any physical friction, thereby enabling gentle cleansing and providing a pleasant cooling sensation for sunburned, hot skin.

All of the skin cleansing sprays in the Examples and Comparative Examples were stable at room temperature, with no precipitates or unpleasant odors observed. On the other hand, with regard to high-temperature stability (formulation stability after storage at 50°C), precipitation of the amphiphilic ester was observed in the skin cleansing spray of Example 21, and an unpleasant menthol odor was observed in the skin cleansing spray of Example 22, but the skin cleansing sprays of Examples 1 to 20 also had excellent high-temperature stability.

[Prescription example]
Liquid skin cleansing sprays were prepared according to the formulations shown in Table 8. All of the skin cleansing sprays had low skin irritation, excellent cleansing power, and were able to provide a pleasant cooling sensation. They also had excellent formulation stability at room temperature and at elevated temperatures.

Claims (8)

(A) an anionic surfactant, a nonionic surfactant, an amphoteric surfactant, and/or a natural surfactant; (B) a dicarboxylic acid bis(polyoxyalkylene alkyl ether) ester; (C) a cooling sensation component; and water,
The content of the component (A) is 0.025 to 2% by weight,
The content of the component (B) is 0.5 to 5% by weight,
The content of the component (C) is 0.001 to 0.3% by weight,
A spray agent for cleaning the skin (excluding the scalp) contained in an aerosol container. (A) a surfactant as a cleansing component, (B) a dicarboxylic acid bis(polyoxyalkylene alkyl ether) ester, (C) a cooling component, and water,
The content of the component (A) is 0.025 to 2% by weight,
The content of the component (B) is 0.5 to 5% by weight,
The content of the component (C) is 0.001 to 0.3% by weight,
A spray agent for cleaning the skin (excluding the scalp) contained in an aerosol container. The skin cleansing spray according to claim 1 or 2, wherein the component (A) is selected from the group consisting of (A1) anionic surfactants selected from lauric acid, cocoyl glutamic acid, cocoyl methyl taurine, and salts thereof, (A2) alkanolamide-type nonionic surfactants and ester-ether-type nonionic surfactants, (A3) fatty acid amidopropyl betaine-type amphoteric surfactants, and (A4) lysolecithin and saponin. The skin cleansing spray according to any one of claims 1 to 3, wherein the spray container is a pump-type spray container. The skin cleansing spray according to any one of claims 1 to 3, wherein the spray container is an aerosol spray container. 6. The skin cleansing spray according to claim 1 , wherein the content of the component (A) is 0.025 to 0.9% by weight. 7. The skin cleansing spray according to claim 1 , wherein the component (C) is menthol and/or menthyl succinate. The skin cleansing spray according to any one of claims 1 to 7 , which is applied to sunburned skin.