Skin cleansing spray

Abstract

To provide a skin cleanser composition that is used in an unconventional method.SOLUTION: A spray agent for skin cleansing, which contains (A) a surfactant, (B) an amphiphilic ester and (C) a cold sense component, while being contained in a spray container, is capable of exhibiting excellent cleansing power, while being reduced in the skin irritancy of a skin cleanser composition, and is able to provide a novel use that is different from conventional uses in which the skin cleanser composition is foamed before application to the skin, said novel use being direct spraying of the skin cleanser composition onto the skin.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a skin cleansing spray that is sprayed directly onto the skin. [Background technology]

[0002] Various skin cleansing compositions, such as 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, and, combined with mechanical force due to friction, cause the dirt to float up into the water. To effectively utilize this cleansing mechanism, it is necessary to incorporate surfactants at a concentration equal to or higher than the critical micelle concentration.

[0003] On the other hand, there is also the current situation where excessively strong cleansing power of surfactants can cause skin irritation, resulting in skin problems such as dry skin. For this reason, various formulas have been proposed that devise combinations and amounts of cleansing ingredients with the aim of making the effect on the skin milder. In particular, since it is recognized that the foam formed during cleansing reduces the friction generated by direct contact between the skin and fingers, it is generally accepted that formulas that improve foam quality, such as foam power and foam retention, are excellent formulas for making the effect on the skin milder.

[0004] For this reason, in recent years, various pump-former-type skin cleansers have been proposed, attracting attention not only for their convenience in easily producing high-quality foam but also for their gentleness to 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 mass % of a specific fatty acid salt having a linear or branched monovalent hydrocarbon group having 7 to 21 carbon atoms, (B) a specific copolymer of dimethyldiallylammonium chloride and acrylic acid and / or acrylamide, and (C) a sugar alcohol, and 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 mass% of a fatty acid salt, (b) 0.5 to 4 mass% of lauryldimethylaminoacetic acid betaine, and (c) 1 to 10 mass% of one or more dihydric alcohols, wherein the sum of the mass% blending amounts of components (a) and (b), (a) + (b), is 3 to 10 mass%, and the blending ratio (b) / (a) is 0.1 to 0.5. Patent Document 3 discloses a cleanser composition to be discharged from a former container, which contains (a) lauryldimethylaminoacetic acid betaine and (b) 4 to 15 mass% of a higher fatty acid soap formed from a fatty acid having 5 to 25 carbon atoms and having a specific composition.

[0005] On the other hand, sunburned skin experiences inflammation, which 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. Patent Document 4 describes the use of a composition containing a cooling agent dissolved in a solvent containing (R)-1,2-propanediol for treating sunburned skin, and Patent Document 5 describes the use of a specific hydrated hemi-tartrate benzimidazol-2-ylpyrimidine compound for treating sunburned skin. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2014 / 003114 [Patent Document 2] Japanese Patent Application Publication No. 2016-098182 [Patent Document 3] International Publication No. 2017 / 081897 [Patent Document 4] Special Publication No. 2014-508740 [Patent Document 5] Special Publication No. 2016-510752 Summary of the Invention [Problem to be solved by the invention]

[0007] Pump-former-type skin cleanser compositions contain a relatively small amount of surfactant, and in this respect, they tend to cause less irritation to the skin than solid or semi-solid skin cleanser compositions. On the other hand, since pump-former-type skin cleanser compositions are essentially intended to be discharged in a foam state, it is unavoidable from the standpoint of their composition to contain the minimum amount of surfactant necessary to exert foaming power.

[0008] Furthermore, a variety of skin cleansers have been developed for the purpose of removing body fluids such as sebum and sweat, as well as dirt, excluding those for makeup removal (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 terms of reducing friction on the skin. Although foam can reduce physical friction by being interposed 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 barrier function and moisture retention capacity.

[0009] As described above, 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 considered necessary for skin cleansers 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.

[0010] Therefore, an object of the present invention is to provide a skin cleansing composition that can be used in a manner different from conventional methods and that can impart a pleasant cooling sensation. [Means for solving the problem]

[0011] The present inventors have come up with the novel idea of ​​directly spraying a skin cleanser composition onto the skin without pre-lathering it, in order to further reduce skin irritation. They have also found that by incorporating an amphiphilic ester into a surfactant, effective cleansing power can be achieved without pre-lathering, 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.

[0012] That is, the present invention provides the following aspects. Item 1. A skin cleansing spray agent containing (A) a surfactant, (B) an amphiphilic ester, and (C) a cooling sensation component, and housed in a spray container. Item 2. The skin cleansing spray according to Item 1, wherein the spray container is a pump 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% by weight. Item 10. The skin cleansing spray according to any one of Items 1 to 9, which is applied to sunburned skin. [Effects of the Invention]

[0013] According to the present invention, the skin cleanser composition can exhibit excellent cleansing power while reducing skin irritation, and therefore can provide a new application in which the skin cleanser composition is directly sprayed onto the skin, unlike conventional applications in which the skin is pre-lathered before application. Because cleansing is possible without pre-lathering, the amount of surfactant blended in the skin cleansing liquid composition can be significantly reduced compared to the amount blended 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 a decrease in the barrier function and moisture retention ability caused by inflammation, such as after sunburn. DETAILED DESCRIPTION OF THE INVENTION

[0014] 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 will be described in detail below.

[0015] (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 of anionic surfactants, nonionic surfactants, amphoteric surfactants, and natural surfactants may be used alone, or two or more of them may be used in any combination.

[0016] Examples of the anionic surfactant used in the present invention include carboxylic acid type, sulfonic acid type, sulfate type, and phosphate type surfactants.

[0017] 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.

[0018] 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-methyltaurines (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.

[0019] Specific examples of sulfate ester surfactants include esters of sulfuric acid with saturated or unsaturated fatty acids having 10 to 22 carbon atoms, such as lauryl sulfate and myristyl sulfate.Specific examples of phosphate ester surfactants include esters of phosphoric acid with saturated or unsaturated fatty acids having 8 to 24 carbon atoms, such as lauryl phosphate.

[0020] These anionic surfactants may be in the form of a salt, for example, an alkali metal salt such as a sodium salt or a potassium salt; a triethanolamine (TEA) salt; an ammonium salt; or the like.

[0021] Among these anionic surfactants, from the viewpoint of achieving better skin irritation reduction and cleaning 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 obtaining better skin irritation reduction properties, preferably, N-acyl glutamic acid having a saturated or unsaturated acyl group having 8 to 24 carbon atoms, and fatty acid amide sulfonic acid having 8 to 22 carbon atoms, and salts thereof are used, more preferably, cocoyl glutamic acid, cocoyl methyl taurine, and salts thereof are used, and even more preferably, triethanolamine cocoyl glutamate and sodium cocoyl methyl taurate are used. Furthermore, from the viewpoint of obtaining better detergency, preferably, N-acylaspartic acid having a saturated or unsaturated acyl group having 8 to 24 carbon atoms is used, more preferably, N-lauroyl aspartic acid is used, and even more preferably, sodium N-lauroyl aspartate is used.

[0022] These anionic surfactants may be used alone or in combination of two or more.

[0023] Examples of the nonionic surfactants used in the present invention include ester-type, ether-type, ester-ether-type, alkanolamide-type, alkylglycoside-type, and alcohol-type surfactants.

[0024] Specific examples of ester 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.

[0025] Specific examples of the ether surfactant include polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene polyoxypropylene glycol, and the like.

[0026] 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.

[0027] Specific examples of alkanolamide surfactants include cocamide DEA (coconut oil fatty acid diethanolamide), lauric acid diethanolamide, oleic acid diethanolamide, and stearic acid diethanolamide.

[0028] Specific examples of alkylglycoside surfactants include octyl glucoside, decyl glucoside, and lauryl glucoside.

[0029] Examples of alcohol-type surfactants include cetanol, stearyl alcohol, and oleyl alcohol.

[0030] Among 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.

[0031] These nonionic surfactants may be used alone or in combination of two or more.

[0032] Examples of the amphoteric surfactant that can be used in the present invention include alkyl betaine type, fatty acid amidopropyl betaine type, and amine oxide type surfactants.

[0033] Specific examples of alkyl betaine surfactants include lauryl dimethyl amino acetic acid betaine, stearyl dimethyl amino acetic acid betaine, and octadecyl amino methyl dimethyl sulfopropyl betaine.

[0034] Specific examples of fatty acid amidopropyl betaine amphoteric surfactants include amidobetaines (amino acid-based amphoteric surfactants) such as cocamidopropyl betaine, and sulfobetaines such as cocamidopropyl hydroxysultaine.

[0035] Specific examples of the amine oxide type amphoteric surfactant include lauryl dimethylamine N-oxide and oleyl dimethylamine N-oxide.

[0036] These amphoteric surfactants may be in the form of a salt, for example, an alkali metal salt such as a sodium salt or a potassium salt; a triethanolamine (TEA) salt; an ammonium salt; or the like.

[0037] Among these amphoteric surfactants, from the viewpoint of achieving better skin irritation reduction and cleaning power, fatty acid amidopropyl betaine surfactants are preferred, more preferably amidobetaines (amino acid amphoteric surfactants) such as cocamidopropyl betaine, and even more preferably cocamidopropyl betaine.

[0038] These amphoteric surfactants may be used alone or in combination of two or more.

[0039] Examples of natural surfactants that can be used in the present invention include lecithin and lysolecithin; 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.

[0040] Lecithin is a mixture of phospholipids such as phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and phosphatidylinositol, and components such as triglycerides, fatty acids, and carbohydrates from vegetable oils, and is a well-known component in pharmaceuticals, quasi-drugs, and cosmetics.

[0041] The lecithin may be natural lecithin derived from animals or plants (e.g., soybean lecithin, egg yolk lecithin, etc.), a chemically treated natural lecithin, or a purified natural lecithin. Examples of chemically treated natural lecithin include hydrogenated lecithin obtained by hydrogenation (e.g., fully hydrogenated lecithin and partially hydrogenated lecithin), and hydroxylated lecithin obtained by hydroxylation. Examples of purified natural lecithin include lecithin with an increased phosphatidylcholine content using a solvent such as acetone.

[0042] Lysolecithin includes the lyso forms of the above-mentioned lecithins (natural lecithin, chemically treated natural lecithin, and purified natural lecithin). Lysolecithin has a structure in which the fatty acid at the 2-position of phosphatidylcholine has been removed by hydrolysis (dissolution) of lecithin with an enzyme such as phospholipase A2.

[0043] Among these natural surfactants, from the viewpoint of achieving better skin irritation reduction and cleaning power, preferred are lecithin, lysolecithin, and saponin, more preferred are lecithin and lysolecithin, and even more preferred is lysolecithin.

[0044] These natural surfactants may be used alone or in combination of two or more.

[0045] The content of component (A) in the skin cleansing spray of the present invention is not particularly limited and can be appropriately determined 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 be effective in 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 wt%. 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 range of the content of component (A) is 1.5 wt% or less, preferably 1 wt% or less, more preferably 0.9 wt% or less, even more preferably 0.6 wt% or less, and even more preferably 0.2 wt% or less. On the other hand, from the viewpoint of obtaining 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.

[0046] (B) Amphiphilic ester The skin cleansing spray of the present invention contains an amphiphilic ester as component (B). Component (B) alone does not exhibit cleansing activity, but when used together with component (A), it can improve the cleansing power of the skin cleansing spray while maintaining its low irritation.

[0047] In the present invention, the amphiphilic ester is one that dissolves at 2% by mass or more 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 also dissolves at 10% by mass or more in the oil isotridecyl isononanoate (Salacos 913, manufactured by The Nisshin Oillio Group, Ltd.) at room temperature (25°C), and ester surfactants are excluded.

[0048] The amphiphilic ester is not particularly limited, but from the viewpoint of obtaining better skin irritation reduction and cleaning power, it is preferably 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 preferred from the viewpoint of obtaining better skin irritation reduction and cleaning power.

[0049] 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, diethylene glycol monoethyl ether and triethylene glycol monoethyl ether.

[0050] 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, an INCI name (International Cosmetic Ingredient Dictionary and Handbook, 13th Edition, Vol. 1, CTFA, 2010, pp. 331-332): BIS-ETHOXYDIGLYCOL Examples include a compound called bisethoxydiglycol succinate, which is abbreviated as SUCCINATE, and more preferably bisethoxydiglycol cyclohexane-1,4-dicarboxylate.

[0051] In the present invention, specific examples of the bisethoxydiglycol cyclohexane-1,4-dicarboxylate include "Neosolue-Aqulio (trade name)" manufactured by Nippon Fine Chemical Co., Ltd., and specific examples of the bisethoxydiglycol succinate include "HiAquostar DCS (trade name)" manufactured by Kokyu Alcohol Kogyo Co., Ltd.

[0052] These dicarboxylic acid bis(polyoxyalkylene alkyl ether) esters may be used alone or in combination of two or more.

[0053] 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 constituting 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. Examples of the alkoxy alcohol constituting the diester compound include 2-methoxyethanol and 2-ethoxyethanol.

[0054] Among 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.

[0055] These dicarboxylic acid dialkoxyalkyl esters may be used alone or in combination of two or more.

[0056] 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.

[0057] 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 moisture, 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, it 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.

[0058] 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). 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 wt%, 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, 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.

[0059] (C) Cooling ingredient 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, cineole, 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.

[0060] Among these cooling sensation components, from the viewpoint of more effectively obtaining a pleasant cooling sensation, preferred are menthol and menthyl succinate, and from the viewpoint of prolonging the cooling sensation, preferred are a combination of menthol and menthyl succinate.

[0061] The menthol may be any of the d-, l-, and dl-isomers, preferably the l- and dl-isomers, and more preferably the l-isomer. Furthermore, essential oils containing menthol may be used as the menthol.

[0062] Monomenthyl succinate is an ester of succinic acid and menthol, and the menthol may be any of the d-, l-, or dl-forms, but is preferably the l- or dl-form, and more preferably the l-form.

[0063] The content of component (C) in the skin cleansing spray of the present invention may be appropriately determined depending on the cooling sensation to be imparted and is not particularly limited, but 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, the content of component (C) is, for example, 0.001 to 0.5 wt%. From the viewpoint of obtaining an even more pleasant cooling sensation, the content of component (C) is preferably 0.01 to 0.5 wt%, more preferably 0.1 to 0.5 wt%, and 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 wt%, more preferably 0.001 to 0.2 wt%.

[0064] Other ingredients 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.), colorants (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.), humectants (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 base materials 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.

[0065] 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 (nonylic acid vanillylamide, nicotinic acid benzyl ester, capsaicin, chili pepper extract, etc.), mucopolysaccharides (chondroitin sulfate sodium, 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 contained, the content thereof may be appropriately determined depending on the type of pharmacological ingredient used, the desired effect, etc.

[0066] form 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).

[0067] container The container for storing the skin cleansing spray of the present invention is not particularly limited, as long as it is a spray container. Note that the spray container in the present invention is one that dispenses the contents in the form of a mist, and is different from a pump-foamer container that dispenses the skin cleanser composition in the form of a foam.

[0068] 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 facilitates application to the skin and avoids physical friction with the hands during application. Examples of spray containers include pump-type spray containers, which are non-aerosol spray containers, and aerosol spray containers. The nozzle diameter (inner diameter of the nozzle) 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-type spray container, the amount sprayed per push is, for example, 0.05 to 1.2 g, preferably 0.1 to 0.3 g.

[0069] Purpose The skin cleansing spray of the present invention is used to remove body fluids such as oils and grease, sweat, and dirt from the skin, and is not used as a makeup remover (cleansing). 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.

[0070] More specifically, the skin cleansing spray can be applied directly to the area to be cleaned by spraying from a spray container without taking it in one's hand. 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 friction between the skin of the area to be cleaned and air bubbles. Because the skin cleansing spray of the present invention is formulated to have 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 foam-free cleansing method allows for quick cleansing, makes it easy to feel that the low surfactant content 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 suitable for cleansing methods that do not impart physical friction to the skin, as described above, this does not exclude the use method of applying the skin cleansing spray to the area to be cleaned and then scrubbing with hands, etc.

[0071] The area to be cleaned with the skin cleansing spray of the present invention is not particularly limited, as any body part can be cleaned, and examples include hands, hair, scalp, body, and face. Since 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 viewpoint of ease of application. Furthermore, since the skin cleansing spray of the present invention can exhibit 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 reduced barrier function, skin with a reduced moisture retention capacity, and skin that is hot. Preferred examples of skin with a reduced barrier function, a reduced moisture retention capacity, and skin that is hot include inflamed skin, and even more preferred examples include skin after sunburn.

[0072] After washing, the skin cleansing spray can be washed off with water. When washing off with water, it may be done in the same way as normal face washing, but from the viewpoint of reducing the burden on the skin, it is preferable to wash off using the mechanical force of a water flow so as not to cause friction with the hands.

[0073] Furthermore, since the surfactant concentration of the skin cleansing spray of the present invention can be extremely low, in this case, it is not necessary to rinse it 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 product. If it is not rinsed off, the skin cleansing spray remaining on the cleansed area may be removed by absorbing it using a water-absorbent substrate such as a towel or tissue.

[0074] Manufacturing method The skin cleansing spray of the present invention is produced by mixing the aforementioned components (A), (B), and (C), as well as 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. [Example]

[0075] The present invention will be explained in more detail below by showing examples, but the present invention is not limited to these examples.

[0076] [Reference test example] Skin cleansing sprays 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 sprays shown in Tables 1 to 4 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. 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 (NOF Corporation's "Diapon K-SF" product name) Sodium N-lauroyl aspartate solution (20% by weight) (Asahi Kasei Fine Chemical Corporation, "Amino Former FLDS-L (product name)") Polyoxyethylene lauryl ether acetate (Kao Akipo RLM-45 (product name) manufactured by Kao Corporation) Cocamide DEA ("Amisol CDE-G" (product 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" manufactured by Kawaken Fine Chemicals Co., Ltd.) Lauryl hydroxysulfobetaine solution (30% by weight) ("Amphitol 20HD" (product name) manufactured by Kao Corporation) Lysolecithin ("Lysolecithin Kyowa" 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-Aqulio" (trade name) manufactured by Nippon Fine Chemical Co., Ltd.) Bisethoxydiglycol succinate (High Aquostar DCS (trade name) manufactured by Kokyu Alcohol Kogyo Co., Ltd.)

[0077] <Cleaning power evaluation> The prepared skin cleansing sprays were evaluated for cleansing power by 10 panelists specializing in cosmetic evaluation. 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 face with their hands. 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.

[0078] 5 points: Dirt was thoroughly removed 4 points: Dirt was removed 3 points: Neither 2 points: Not much dirt removal 1 point: No stain removal at all

[0079] 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 but less than 40 points ×: Less than 35 points

[0080] <Tightness evaluation> The prepared skin cleansing sprays were evaluated for their feeling of tightness by 10 panelists specializing in cosmetic evaluation. Specifically, each skin cleansing spray was placed in a pump-type spray container ("Z-155-C110 (trade name)" manufactured by Takemoto Container Co., Ltd. (0.15g spray amount per pump) and 1.5g 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 face with their hands. 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.

[0081] 5 points: No tightness at all 4 points: Almost no tightness 3 points: Only a slight feeling of tightness 2 points: Feeling of tightness 1 point: Strong feeling of tension

[0082] The scores obtained by the 10 panelists were added up, 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 but less than 40 points ×: Less than 35 points

[0083] <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 (Takemoto Container Co., Ltd., "Z-155-C110 (trade name)" (0.15g spray amount per pump) and 5g was applied by spraying directly onto the entire body. After leaving it for about 5 seconds, the subjects rinsed it off with water, avoiding touching the skin with their hands. After absorbing the water by pressing a towel against the skin, the cooling sensation was scored by sensory evaluation based on the following criteria.

[0084] 3 points: Feels a very pleasant cooling sensation 2 points: Feels a pleasant cool sensation 1 point: Feels slightly cold 0 points: No cooling sensation and not comfortable

[0085] 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

[0086] <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-MODEL24 The assay medium was warmed and added in 0.5 mL portions to a 24-well assay plate. The cultured epidermal model, LabCyte EPI-MODEL24 (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.

[0087] 2. Test Substance Application and Washing Of the 24 epidermal models, 12 were used (the remaining ones continued pre-culture until the actual test). The 24-well assay plate was removed from the CO2 incubator. The assay medium was warmed and added in 1.0 mL portions 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 bottle, 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.

[0088] 3.MTT test The MTT test measures 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 when [de] is reduced by mitochondrial dehydrogenase within the cell with an organic solvent and measuring the absorbance at 570 nm.

[0089] MTT medium was prepared at a final concentration of 0.5 mg / mL (10 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. After the MTT reaction, 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 absorbance at 650 nm was subtracted from the absorbance at 570 nm to obtain the measured value, and the viability of the test substance was calculated using the following formula.

[0090]

number

[0091] 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 but less than 90% △: 65% or more but less than 75% ×: 50% or more but less than 65% ××: Less than 50%

[0092] As shown in Tables 1 to 4, no cleansing power was observed in the skin cleansing sprays (Reference Comparative Examples 1 to 10) containing a surfactant alone at a concentration of 0.025 to 2 wt%. In contrast, the skin cleansing sprays (Reference Examples 1 to 20) containing an amphiphilic ester (Reference Comparative Examples 11 to 15), which does not exhibit cleansing power alone, together with 0.025 to 2 wt% of a 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.

[0093] As shown in Reference Examples 1 to 3, even skin cleansing sprays containing more than 2% by weight of a surfactant alone can provide excellent cleansing power simply by spraying them directly onto the skin. Meanwhile, taking into account the skin irritation caused by the surfactant concentration shown in Reference Examples 1 to 3, when the surfactant concentration was set to 2% by weight or less as shown in Reference Examples 9 to 20, not only cleansing power but also excellent low irritation was achieved. In other words, it was demonstrated that by setting the surfactant concentration of the skin cleansing spray to be sprayed directly onto the skin to 0.025 to 2% by weight, it is possible to achieve cleansing that is both physically and chemically gentle on the skin. Meanwhile, 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.

[0094] [Table 1]

[0095] [Table 2]

[0096] [Table 3]

[0097] [Table 4]

[0098] [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.

[0099] <Cleaning power evaluation> The cleansing power of the prepared skin cleansing sprays was evaluated 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 (Takemoto Container Co., Ltd., "Z-155-C110 (trade name)" with a spray amount of 0.15 g per pump), and 5 g was applied by spraying directly onto the entire body. The spray was left for approximately 5 seconds, and then the person rinsed with water without touching the skin with their hands. After absorbing the water by pressing the skin with a towel, the feeling of dirt removal on the skin was evaluated by sensory evaluation and scored based on the following criteria. 3 points: Dirt was thoroughly removed 2 points: Dirt was removed 1 point: Slight stain removal 0 points: No stain removal at all

[0100] 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

[0101] <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 (Takemoto Container Co., Ltd., "Z-155-C110 (trade name)" (0.15g spray amount per pump) and 5g 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 scored by sensory evaluation based on the following criteria.

[0102] 3 points: No irritation felt at all 2 points: Only a slight sensation of irritation was felt 1 point: I felt a sense of irritation 0 points: I felt a strong sense of stimulation

[0103] 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

[0104] <Tightness evaluation> The prepared skin cleansing sprays were evaluated for tightness by 10 people who had spent time outdoors during the daytime during periods 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 (Takemoto Container Co., Ltd., "Z-155-C110 (trade name)" (0.15g per pump) and 5g was applied by spraying directly onto the entire body. After leaving it for about 5 seconds, the person rinsed it off with water, avoiding touching the skin with their hands. After holding the skin with a towel to absorb the water, the tightness was evaluated by sensory evaluation based on the following index. The stronger the tightness, the more insufficient moisture was felt.

[0105] 3 points: No tightness felt at all 2 points: I only felt a slight feeling of tightness 1 point: I felt a sense of tightness 0 points: I felt a strong sense of tightness

[0106] 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

[0107] <Cooling sensation evaluation> The prepared skin cleansing spray was 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.

[0108] <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 criteria. The differences in appearance and odor were evaluated based on the 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.

[0109] 3 points: No difference was observed 2 points: Only a slight difference was observed 1 point: Differences were observed 0 points: A large difference was observed

[0110] 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

[0111] 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 alone, together with a surfactant (Comparative Example 2), even with a low surfactant concentration, provided excellent cleansing power simply by spraying it directly onto the skin from a spray container, without any physical friction, and by utilizing the mechanical force of the liquid flow. 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 alone, together with a surfactant, and also contained a cooling component, even with a low surfactant concentration, provided excellent cleansing power simply by spraying it directly onto the skin from a spray container, without any physical friction, and were therefore gentle on the skin, while also providing a pleasant cooling sensation for sunburned, hot skin.

[0112] Furthermore, 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 (preparation 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 were also excellent in terms of high-temperature stability.

[0113] [Table 5]

[0114] [Table 6]

[0115] [Table 7]

[0116] [Prescription example] Liquid skin cleansing sprays were prepared according to the formulations shown in Table 8. All skin cleansing sprays had low skin irritation, excellent cleansing power, a pleasant cooling sensation, and excellent formulation stability at room temperature and at elevated temperatures.

[0117] [Table 8]

Claims

1. (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.

2. The composition contains (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.

3. 3. The skin cleansing spray according to claim 1, 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.

4. The skin cleansing spray according to any one of claims 1 to 3, wherein the spray container is a pump-type spray container.

5. The skin cleansing spray according to any one of claims 1 to 3, wherein the spray container is an aerosol spray container.

6. 6. The skin cleansing spray according to claim 1, wherein the content of component (A) is 0.025 to 0.9% by weight.

7. 7. The skin cleansing spray according to claim 1, wherein the component (C) is menthol and / or menthyl succinate.

8. The skin cleansing spray according to any one of claims 1 to 7, which is applied to sunburned skin.

Images