Liquid composition for skin cleansing

Abstract

To provide a liquid composition for skin cleansing which is used in an unconventional method.SOLUTION: A liquid composition 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 liquid composition for skin cleansing, and is able to provide a novel use that is different from conventional uses in which the liquid composition for skin cleansing is foamed before application to the skin, said novel use being direct spraying of the liquid composition for skin cleansing onto the skin.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a liquid composition for cleansing the skin, which is capable of cleansing the skin without applying physical friction to the skin and also provides a pleasant cooling sensation. [Background technology]

[0002] As products for cleaning the skin and keeping it clean, various skin cleansing compositions such as face washes, body soaps, shampoos, etc. are provided. In the mechanism by which skin cleansing compositions cleanse the skin, the surfactant adsorbs to dirt, reducing the surface tension between the dirt and water, and, together with the mechanical force due to friction, causes the dirt to float up in the water. In order to make such a cleaning mechanism work effectively, it is necessary to incorporate the surfactant at a critical micelle concentration or higher.

[0003] On the other hand, the current situation is that the cleaning power of surfactants is too strong, which causes skin irritation, resulting in skin troubles such as dry skin. For this reason, various formulations have been proposed that devise combinations and amounts of cleaning ingredients in order to make the action on the skin milder. Among them, since it is recognized that the foam formed during cleaning reduces the friction generated by direct contact between the skin and fingers, it is generally accepted that a formulation that improves foam quality such as foaming power and foam retention is excellent as a formulation that makes the action on the skin milder.

[0004] For this reason, in recent years, various pump foamer-type skin cleansers have been proposed, and they have attracted attention not only for their convenience of easily obtaining good quality foam, but also for their gentleness to the skin. Specifically, Patent Document 1 discloses a liquid skin cleansing agent product comprising a foamer container and a liquid skin cleansing agent composition filled in the foamer container, the liquid skin cleansing agent composition containing (A) 3-10% by mass of a specific fatty acid salt having a linear or branched monovalent hydrocarbon group having 7-21 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 the component (A) to the content of the component (B) is 20-250. Patent Document 2 discloses a skin cleansing composition characterized in that the cleansing agent contains (a) 2-9% by mass of fatty acid salt, (b) 0.5-4% by mass of lauryldimethylaminoacetate betaine, and (c) 1-10% by mass of one or more dihydric alcohols, and the sum of the blending amounts (mass%) of the (a) and (b) components (a)+(b) is 3-10% by mass, and the blending amount ratio (b) / (a) is 0.1-0.5, filled in a former container. Patent Document 3 discloses a cleansing composition discharged from a former container, which contains (a) lauryldimethylaminoacetate betaine and (b) 4-15% by mass of a higher fatty acid soap formed from a fatty acid having 5-25 carbon atoms and having a specific composition.

[0005] On the other hand, after sunburn, the skin is inflamed, which can be considered as a kind of burn condition, and the barrier function and water 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 hemitartrate 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] JP 2016-098182 A [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 foamer-type skin cleansing 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 cleansing compositions. On the other hand, since the pump foamer-type skin cleansing composition is premised on being discharged in a foam state, it is unavoidable from the viewpoint of its composition to contain the minimum amount of surfactant required to exert foaming power.

[0008] In addition, various skin cleansers have been created for the purpose of removing body fluids such as sebum and sweat, dirt, etc., except for skin cleansers for makeup removal (cleansing), but all skin cleansers are based on the premise that they are foamed before application to the skin, and it is also common knowledge that foaming well before washing is preferable in terms of reducing friction on the skin. Although foam can reduce physical friction by being placed between the skin and the hands, the foam itself is rubbed against the skin, which in turn generates physical friction and is still irritating to the skin. In particular, irritation remains a concern for sensitive skin whose barrier function and moisture retention ability are reduced due to inflammation, such as skin after sunburn.

[0009] Thus, 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 to the skin 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 cleaning, but also to suppress the hot flashes caused by inflammation.

[0010] Furthermore, in beauty salons and hairdressing salons, face washing treatments are sometimes performed, and in order to improve the quality of such services, gentle and comfortable washing treatments are desired for sensitive skin such as after sunburn.

[0011] Therefore, an object of the present invention is to provide a liquid composition for cleansing the skin, which can clean the skin without exerting physical friction thereon and can impart a pleasant cooling sensation. [Means for solving the problem]

[0012] The present inventors came up with the idea of ​​a novel use in which a skin cleansing liquid composition is directly applied to the skin without foaming it in advance, so as to further reduce skin irritation, and cleans the skin without applying physical friction to the skin. Furthermore, they found that by making an amphiphilic ester coexist with a surfactant, effective cleansing power can be obtained without applying physical friction to the skin, and by further blending a cooling sensation component, a comfortable cooling sensation can be imparted. The present invention was completed through further investigation based on this finding.

[0013] That is, the present invention provides the following aspects. Item 1. A liquid composition for cleansing skin, comprising (A) a surfactant, (B) an amphiphilic ester, and (C) a cooling sensation component, and used for cleansing the skin without applying physical friction to the skin. Item 2. The liquid composition for cleansing skin according to Item 1, wherein the component (B) is selected from the group consisting of dicarboxylate bis(polyoxyalkylene alkyl ether) esters, dicarboxylate dialkoxyalkyl esters, and polyglyceryl-10 (eicosadioate / tetradecanedioate). Item 3. The liquid composition for cleansing skin according to Item 2, wherein the dicarboxylic acid bis(polyoxyalkylene alkyl ether) ester is cyclohexane-1,4-dicarboxylate bisethoxydiglycol. Item 4. The liquid composition for cleansing skin according to any one of Items 1 to 3, wherein the content of the component (A) is 0.025 to 2 wt %. Item 5. The liquid composition for cleansing skin according to any one of Items 1 to 4, wherein the content of the component (A) is 0.025 to 0.9% by weight. Item 6. The liquid composition for cleansing skin according to any one of Items 1 to 5, wherein the component (C) is menthol and / or menthyl succinate. Item 7. The liquid composition for cleansing skin according to any one of Items 1 to 6, wherein the content of the component (C) is 0.001 to 0.5% by weight. Item 8. The liquid composition for skin cleansing according to any one of Items 1 to 7, which is applied to skin after sunburn. Item 9. A method for cleansing the skin, comprising applying a liquid composition for cleansing the skin, which contains (A) a surfactant, (B) an amphiphilic ester, and (C) a cooling sensation component, to the skin without applying physical friction to the skin. Effect of the Invention

[0014] The skin cleansing liquid composition of the present invention can exert excellent cleansing power while reducing skin irritation, and therefore can clean the skin without foaming beforehand and without applying physical friction to the skin. Since the skin can be cleaned without applying physical friction, the amount of surfactant in the skin cleansing liquid composition can be significantly reduced compared to the amount contained in conventional skin cleansing liquid compositions, which can further reduce skin irritation. In addition, the skin cleansing liquid composition can impart a comfortable cooling sensation while reducing skin irritation, and can therefore be suitably used to clean skin that has become sensitive and hot due to reduced barrier function and moisture retention capacity caused by inflammation, such as skin after sunburn. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] 1. Liquid composition for cleansing skin The liquid composition for cleansing skin 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)). The liquid composition for cleansing skin of the present invention will be described in detail below.

[0016] (A) Surfactant The skin cleansing liquid composition 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, natural surfactants, etc. 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.

[0017] Examples of the anionic surfactant used in the present invention include carboxylic acid type, sulfonic acid type, sulfate type, and phosphate type surfactants.

[0018] Specific examples of carboxylic acid type 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 having saturated or unsaturated N-acyl groups having 8 to 24 carbon atoms, such as octanoyl group, decanoyl group, lauroyl group, myristoyl group, palmitoyl group, and cocoyl group (carboxylic acid type amino acid anionic surfactants). Examples of N-acylamino acids in carboxylic acid type amino acid anionic surfactants include N-acylsarcosine, N-acylaspartic acid, N-acylglutamic acid, and lauroylmethyl-β-alanine. More specific examples of carboxylic acid type amino acid anionic surfactants include N-lauroylsarcosine, N-lauroylaspartic acid, cocoylglutamic acid, and sodium lauroylmethyl-β-alanine.

[0019] Specific examples of sulfonic acid surfactants include esters of fatty acids having 6 to 22 carbon atoms, such as cocoyl isethionic acid, and 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 surfactant) having a saturated or unsaturated N-acyl group having 8 to 24 carbon atoms, such as an octanoyl group, a decanoyl group, a lauroyl group, a myristoyl group, a palmitoyl group, or a cocoyl group. More specific examples of sulfonic acid amino acid anionic surfactants include N-myristoyl-N-methyltaurine, N-lauroylmethyltaurine, and cocoylmethyltaurine.

[0020] Specific examples of sulfate ester surfactants include esters of saturated or unsaturated fatty acids having 10 to 22 carbon atoms, such as lauryl sulfate and myristyl sulfate, and sulfate.Specific examples of phosphate ester surfactants include esters of saturated or unsaturated fatty acids having 8 to 24 carbon atoms, such as lauryl phosphoric acid, and phosphoric acid.

[0021] 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.

[0022] Among these anionic surfactants, from the viewpoint of obtaining better skin irritation reduction properties and cleaning power, preferred are carboxylic acid type surfactants and sulfonic acid type 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, fatty acid amide sulfonic acid having 8 to 22 carbon atoms, and salts thereof are mentioned, more preferably, cocoyl glutamic acid, cocoyl methyl taurine, and salts thereof are mentioned, and even more preferably, triethanolamine cocoyl glutamate, and sodium cocoyl methyl taurine are mentioned, and further, from the viewpoint of obtaining better cleaning power, preferably, N-acylaspartic acid having a saturated or unsaturated acyl group having 8 to 24 carbon atoms is mentioned, more preferably, N-lauroyl aspartic acid is mentioned, and even more preferably, sodium N-lauroyl aspartate is mentioned.

[0023] These anionic surfactants may be used alone or in combination of two or more.

[0024] Examples of the nonionic surfactant used in the present invention include ester type, ether type, ester-ether type, alkanolamide type, alkylglycoside type, and alcohol type surfactants.

[0025] 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.

[0026] Specific examples of the ether type surfactant include polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene polyoxypropylene glycol, and the like.

[0027] Examples of ester / ether type surfactants include polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene hexitane fatty acid ester, and sorbitan fatty acid ester polyethylene glycol.

[0028] Specific examples of alkanolamide surfactants include cocamide DEA (coconut oil fatty acid diethanolamide), lauric acid diethanolamide, oleic acid diethanolamide, and stearic acid diethanolamide.

[0029] Specific examples of alkyl glycoside surfactants include octyl glucoside, decyl glucoside, and lauryl glucoside.

[0030] Examples of alcohol-based surfactants include cetanol, stearyl alcohol, and oleyl alcohol.

[0031] Among these nonionic surfactants, from the viewpoint of obtaining better skin irritation reduction properties and cleaning power, preferably, ester / ether type surfactants and alkanolamide type surfactants are used, more preferably, polyoxyethylene hydrogenated castor oil and cocamide DEA are used, and even more preferably, polyoxyethylene hydrogenated castor oil is used.

[0032] These nonionic surfactants may be used alone or in combination of two or more. They may also be used in combination.

[0033] 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.

[0034] Specific examples of alkyl betaine type surfactants include lauryl dimethyl amino acetate betaine, stearyl dimethyl amino acetate betaine, and octadecyl aminomethyl dimethyl sulfopropyl betaine.

[0035] 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.

[0036] Specific examples of the amine oxide type amphoteric surfactant include lauryl dimethylamine N-oxide and oleyl dimethylamine N-oxide.

[0037] 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.

[0038] Among these amphoteric surfactants, from the viewpoint of obtaining better skin irritation reduction and cleaning power, fatty acid amidopropyl betaine type surfactants are preferred, more preferably amidobetaines (amino acid-based amphoteric surfactants) such as cocamidopropyl betaine, and even more preferably cocamidopropyl betaine.

[0039] These amphoteric surfactants may be used alone or in combination of two or more kinds.

[0040] 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, soja saponin, beet saponin, adzuki bean saponin, carrot saponin, tea seed saponin, loofah saponin, and Centella saponin.

[0041] Lecithin is a mixture of phospholipids such as phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and phosphatidylinositol, and other components such as triglycerides, fatty acids, and carbohydrates from vegetable oils, and is a well-known component in pharmaceuticals, quasi-drugs, and cosmetics.

[0042] The lecithin may be natural lecithin derived from animals or plants (e.g., soybean lecithin, egg yolk lecithin, etc.), a chemically treated product of natural lecithin, or a purified product of 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.

[0043] Examples of lysolecithin include the lyso form of the above-mentioned lecithin (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.

[0044] Among these natural surfactants, from the viewpoint of obtaining better skin irritation reduction properties and cleaning power, preferred are lecithin, lysolecithin, and saponin, more preferred are lecithin and lysolecithin, and even more preferred is lysolecithin.

[0045] These natural surfactants may be used alone or in combination of two or more.

[0046] The content of the (A) component in the skin cleansing liquid composition of the present invention is not particularly limited and can be appropriately determined depending on the cleaning power to be imparted. Since the skin cleansing liquid composition of the present invention can clean the skin without applying physical friction, the amount of surfactant in the skin cleansing liquid composition can be significantly reduced compared to the amount contained in the conventional skin cleansing liquid composition, and the skin cleansing power can be effectively exerted even with a small amount of surfactant that does not inherently exert effective cleaning power. From this viewpoint, the content of the (A) component in the skin cleansing liquid composition of the present invention is preferably 0.025 to 2% by weight. Furthermore, from the viewpoint of further suppressing skin irritation and a feeling of tightness due to insufficient moisturization, the upper limit of the above content range of the (A) component 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 obtaining better detergency, the lower limit of the range of the content of the (A) component is preferably 0.1 wt % or more, more preferably 0.5 wt % or more, even more preferably 1.5 wt % or more, and particularly preferably 1.8 wt % or more.

[0047] (B) Amphiphilic ester The liquid skin cleansing composition of the present invention contains an amphiphilic ester as component (B). Component (B) does not exhibit a cleansing effect alone, but by coexisting with component (A), it is possible to improve the cleansing power of the liquid skin cleansing composition while maintaining low irritation.

[0048] 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, when measured according to the method specified in the general testing methods of the Japanese Pharmacopoeia, and also dissolves at 10% by mass or more in the oil agent isotridecyl isononanoate (Salacos 913, manufactured by Nisshin Oillio Group, Ltd.) at room temperature (25° C.), and excludes ester-based surfactants.

[0049] The amphiphilic ester is not particularly limited, but from the viewpoint of obtaining better skin irritation reduction and cleaning power, it is preferable to select from the group consisting of dicarboxylic acid bis(polyoxyalkylene alkyl ether) ester, dicarboxylic acid dialkoxy alkyl ester, and (eicosane diacid / tetradecanedioic acid) polyglyceryl-10. As the amphiphilic ester, any one of dicarboxylic acid bis(polyoxyalkylene alkyl ether) ester, dicarboxylic acid dialkoxy alkyl ester, and (eicosane diacid / tetradecanedioic acid) polyglyceryl-10 may be used alone, or two or more kinds may be used in combination. Among these amphiphilic esters, dicarboxylic acid bis(polyoxyalkylene alkyl ether) ester is more preferable from the viewpoint of obtaining better skin irritation reduction and cleaning power.

[0050] 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, for example, 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. In addition, examples of the polyoxyalkylene alkyl ether constituting the diester compound include, for example, polyoxyethylene monoalkyl ether, and more specifically, for example, diethylene glycol monoethyl ether and triethylene glycol monoethyl ether.

[0051] Among these dicarboxylic acid bis(polyoxyalkylene alkyl ether) esters, from the viewpoint of obtaining better skin irritation reduction properties and cleaning power, 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, 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, represented by the INCI name (International Cosmetic Ingredient Dictionary and Handbook, 13th Edition, Vol. 1, CTFA, 2010, p. 331-332): BIS-ETHOXYDIGLYCOL Examples of the compound include bisethoxydiglycol succinate, which is represented by SUCCINATE, and more preferably bisethoxydiglycol cyclohexane-1,4-dicarboxylate.

[0052] In the present invention, a specific example of the bis-ethoxydiglycol cyclohexane-1,4-dicarboxylate is "Neosolue-Aqulio (trade name)" manufactured by Nippon Fine Chemicals Co., Ltd., etc. In addition, a specific example of the bis-ethoxydiglycol succinate is "High Aquostar DCS (trade name)" manufactured by Kokyu Alcohol Kogyo Co., Ltd., etc.

[0053] These dicarboxylic acid bis(polyoxyalkylene alkyl ether) esters may be used alone or in combination of two or more.

[0054] 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, acetone dicarboxylic acid, phthalic acid, and cyclohexane-1,4-dicarboxylic acid. Examples of the alkoxy alcohol constituting the diester compound include 2-methoxyethanol and 2-ethoxyethanol.

[0055] Among these dicarboxylate dialkoxyalkyl esters, from the viewpoint of obtaining better skin irritation reduction properties and cleaning power, a diester compound of succinic acid and 2-ethoxyethanol, specifically diethoxyethyl succinate, is preferable.

[0056] These dicarboxylic acid dialkoxyalkyl esters may be used alone or in combination of two or more.

[0057] The polyglyceryl-10 (eicosane diacid / tetradecanedioic acid) used in the present invention is not particularly limited, but examples thereof include "Neosolue-Aqua (trade name)" and "Neosolue-AquaS (trade name)" manufactured by Nippon Fine Chemical Co., Ltd.

[0058] The content of the (B) component in the skin cleansing liquid composition of the present invention is not particularly limited, but may be, for example, 0.1% by weight or more. From the viewpoint of obtaining better cleaning power and / or further reducing the feeling of tightness due to insufficient moisturization, the content of the (B) component is preferably 0.5% by weight or more, more preferably 1.5% by weight or more, more preferably 3% by weight or more. The upper limit of the range of the content of the (B) component is not particularly limited, but from the viewpoint of stability such as suppressing precipitation after high-temperature storage of the skin cleansing spray agent, 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, even more preferably 1% by weight or less.

[0059] In the skin cleansing liquid composition of the present invention, the ratio of the (A) component to the (B) component is not particularly limited and is determined by the above-mentioned respective contents, but from the viewpoint of obtaining better skin irritation reduction and cleaning power, for example, 0.1 to 100 parts by weight of the (B) component per 1 part by weight of the (A) component can be mentioned. Furthermore, from the viewpoint of obtaining better cleaning power when the (A) component is contained in a small amount of about 0.5 to 1.5% by weight, the (B) component is preferably 2 to 100 parts by weight, preferably 2.5 to 50 parts by weight, more preferably 3 to 10 parts by weight, per 1 part by weight of the (A) component. Furthermore, from the viewpoint of further reducing the feeling of tightness due to insufficient moisture, the (B) component 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, per 1 part by weight of the (A) component.

[0060] (C) Cooling ingredient The skin cleansing liquid composition of the present invention contains a cooling component as component (C). The cooling component is not particularly limited as long as it is a component that brings about 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, menthane carbonyl glycine 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 components may be used alone or in any combination of two or more.

[0061] Among these cooling sensation components, from the viewpoint of more effectively obtaining a comfortable 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.

[0062] The menthol may be any of d-, l-, and dl-isomers, preferably l- and dl-isomers, more preferably l-isomers. In addition, essential oils containing menthol may be used as the menthol.

[0063] Monomenthyl succinate is an ester of succinic acid and menthol. The menthol may be any of d-, l-, or dl-forms, but is preferably the l- or dl-form, and more preferably the l-form.

[0064] The content of the (C) component in the skin cleansing liquid composition 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 comfortable cooling sensation, and from the viewpoint of stability such as suppressing an unpleasant odor after high-temperature storage, the content of the (C) component is, for example, 0.001 to 0.5% by weight. From the viewpoint of obtaining a more comfortable cooling sensation, the content of the (C) component is preferably 0.01 to 0.5% by weight, more preferably 0.1 to 0.5% by weight, 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% by weight, more preferably 0.001 to 0.2% by weight.

[0065] Other Ingredients In addition to the above-mentioned components, the skin cleansing liquid composition of the present invention may contain other bases and additives required for formulation, etc., within the scope of not impairing the effects of the present invention. Such additives are not particularly limited as long as they are pharma- ceutically 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.), cacao dyes, chlorophyll, aluminum oxide, etc.), thickeners (hydroxypropylcellulose, hydroxyethylcellulose, crosslinked 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 (dl-sodium pyrrolidone carboxylate 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, dissolution aids, solubilizers, preservatives, and other additives. These substrates and additives may be used alone or in combination of two or more. The contents of these base materials and additives can be appropriately set depending on the formulation form, etc.

[0066] In addition to the above-mentioned components, the liquid composition for cleansing the skin of the present invention may contain other pharmacological components as necessary within the scope of not impairing the effects of the present invention. Examples of such pharmacological components include vitamins (vitamin A, vitamin B1, vitamin B2, vitamin B5, vitamin B6, vitamin B12, vitamin C, vitamin D, vitamin 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. Toxidecan, 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, capsicum extract, etc.), mucopolysaccharides (sodium chondroitin sulfate, glucosamine, hyaluronic acid, cationized hyaluronic acid (dihydroxypropyltrimonium hyaluronate, etc.), etc.) can be mentioned. These pharmacological ingredients may be used alone or in combination of two or more kinds. When these pharmacological ingredients are contained, the content may be appropriately set according to the type of pharmacological ingredient used, the expected effect, etc.

[0067] form The skin cleansing liquid composition of the present invention is in the form of a liquid or gel at room temperature. The viscosity of the skin cleansing liquid composition 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.).

[0068] container The container for storing the skin cleansing liquid composition of the present invention is not particularly limited as long as it allows the skin cleansing liquid composition to be applied directly to the skin from within the container, and examples thereof include a spray type container and a pour-on or drop-off type container (particularly a cleaning bottle). From the viewpoint of ease of treatment in beauty salons and hairdressers, a pour-on or drop-off type container (particularly a cleaning bottle) is preferred. The spray container in the present invention is one that discharges the content in a mist state, and is different from a pump foamer container that discharges the skin cleansing liquid composition in a foam state.

[0069] In the present invention, the skin cleansing liquid composition is stored in a spray container, pour-on or drop-off container (particularly a cleaning bottle) in this manner, and the skin cleansing liquid composition is applied directly to the skin without foaming before application to the skin. Therefore, application to the skin is easy and physical friction caused by hands during application and / or physical friction caused by foam during cleaning can be avoided. Examples of the spray container include a pump spray container, which is a non-aerosol spray container, and an aerosol spray container. The aperture (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 spray container, the spray amount per push is, for example, 0.05 to 1.2 g, preferably 0.1 to 0.3 g.

[0070] Purpose The liquid composition for cleansing the skin of the present invention is used to remove body fluids such as oils and fats, sweat, and dirt from the skin, and is not used as a makeup remover (cleansing). The liquid composition for cleansing the skin of the present invention is used for face washing treatments in beauty salons and hairdressing salons. The liquid composition for cleansing the skin of the present invention is used by applying it directly to the skin without diluting it with water or foaming it. The amount of use per application varies depending 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.

[0071] More specifically, the skin cleansing liquid composition can be applied directly to the area to be cleaned from a spray container, pour-on container, or drop-on container (particularly a cleaning bottle) without taking the liquid composition in the hand. By directly applying the skin cleansing liquid composition to the area to be cleaned in this way, it is possible to clean the area by simply using the mechanical force of the liquid flow without applying any physical friction such as friction between the skin of the area to be cleaned and the hand, or between the skin of the area to be cleaned and air bubbles. Since the skin cleansing liquid composition of the present invention is a formulation with excellent cleaning power, cleaning by using the mechanical force of the liquid flow without applying physical friction in this way significantly reduces the burden on the skin during cleaning, making it possible to achieve an extremely gentle cleaning method. This type of cleaning method that does not create foaming allows for quick cleaning, is easy to realize that it is gentle on the skin with less surfactant, and is also easy to obtain the satisfaction of consumers who are highly conscious of pursuing gentle cleaning on the skin.

[0072] The site to be cleaned with the liquid composition for skin cleansing of the present invention is not particularly limited since any body part can be cleaned, and examples thereof include hands, hair, scalp, body, face, etc. In addition, since the liquid composition for skin cleansing of the present invention can exert excellent cleaning power without applying physical friction to the skin, it is suitable for use on the face, which is sensitive to irritation. Furthermore, the liquid composition for skin cleansing of the present invention is particularly suitable for skin conditions of the site to be cleaned, such as skin with reduced barrier function, skin with reduced water retention ability, and skin that shows hot flashes. A preferred example of skin with reduced barrier function, reduced water retention ability, and hot flashes is inflamed skin, and a more preferred example is skin after sunburn.

[0073] After washing, the liquid composition for skin washing can be washed off with water. When washing off with water, the mechanical force of the water flow is used to wash off the skin without physical friction caused by hands. The water used for washing off can also be stored in a spray container, a pour-on or drop-off container (particularly a washing bottle), preferably a pour-on or drop-off container (particularly a washing bottle), and can be applied to the area to be washed in the same manner as the liquid composition for skin washing.

[0074] In addition, since the surfactant concentration of the skin cleansing liquid composition of the present invention can be extremely low, in this case, it is not necessary to rinse it off after cleaning. Therefore, the skin cleansing liquid composition of the present invention is also suitable for use in wiping in hospitals, for use in skin cleansing treatments such as face washing in beauty salons and hairdressing salons, and for use as disaster supplies. If it is not rinsed off, the skin cleansing liquid composition remaining on the cleaned area may be removed by absorbing it using a water-absorbent substrate such as a towel or tissue, without rubbing.

[0075] Manufacturing method The skin cleansing liquid composition of the present invention is produced by mixing the aforementioned components (A), (B), and (C), as well as other components that may be blended as necessary, and preparing the mixture into a predetermined form.

[0076] 2. Skin cleansing method As described above, the amphiphilic ester can improve the cleaning power of a skin cleansing composition containing a surfactant and a cooling component without applying physical friction to the skin. Therefore, the present invention further provides a skin cleansing method that includes applying a skin cleansing liquid composition containing the surfactant (A) and the cooling component (C) as well as the amphiphilic ester (B) to the skin without applying physical friction to the skin. The skin cleansing method of the present invention can be carried out as a cleaning treatment performed at an esthetic salon or a beauty salon.

[0077] In the above-mentioned skin cleansing method, the types and amounts of the components used, the form of the skin cleansing composition, etc. are as shown in the above section "1. Skin cleansing liquid composition". EXAMPLES

[0078] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these.

[0079] [Reference test example] Skin cleansing liquid compositions were prepared according to the compositions shown in Tables 1 to 4. Details of each component shown in Tables 1 to 4 are as follows. The skin cleansing liquid compositions shown in Tables 1 to 4 were in liquid form, and all had a viscosity at 20°C (measured with a BL viscometer (Brookfield B-type viscometer) rotor No. 3, 6 rpm) in the range of 5000 mPa s or less. Sodium laurate (NOF Corp. "NonSal LN-1" (product name) TEA-Cocoyl Glutamate (Amisoft CT-12S (product name) manufactured by Ajinomoto Co., Inc.) Sodium methyl cocoyl taurate (NOF Corp. "Diapon K-SF (product name)") Sodium N-lauroyl aspartate solution (20% by weight) (Asahi Kasei Fine Chemical Corporation's "Aminoformer FLDS-L (product name)") Polyoxyethylene lauryl ether acetate (Kao Corporation "Kao Akipo RLM-45 (product name)") Cocamide DEA ("Amizol CDE-G (product name)" manufactured by Kawaken Fine Chemical Co., Ltd.) PEG-60 hydrogenated castor oil (polyoxyethylene hydrogenated castor oil; "NIKKOL HCO-60 (product name)" manufactured by Nikko Chemicals Co., Ltd.) Polyoxyethylene sorbitan monostearate (Kao Corporation, Rheodor TW-S120V) Glycerol mono-2-ethylhexyl ether (SEPPIC "sensiva SC 50 JP (product name)”) Cocamidopropyl betaine ("Softazoline CPB (product 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" manufactured by Kyowa Hakko Bio Co., Ltd.) Quillaja japonica extract (Maruzen Pharmaceutical Co., Ltd. "Quillaja japonica extract BG", saponin content 5% by weight) Cyclohexane-1,4-dicarboxylate bisethoxydiglycol ("Neosolue-Aqulio" (product name) manufactured by Nippon Fine Chemical Co., Ltd.) Bisethoxydiglycol succinate ("High Aquostar DCS (product name)" manufactured by Kokyu Alcohol Kogyo Co., Ltd.)

[0080] <Cleaning power evaluation> The prepared skin cleansing liquid compositions were evaluated for cleansing power by 10 panelists specializing in cosmetic evaluation. Specifically, each skin cleansing liquid composition was placed in a pump-type spray container ("Z-155-C110 (trade name)" manufactured by Takemoto Container Co., Ltd., spray amount per push is 0.15 g), and 1.5 g was applied by spraying directly onto the face. The composition was left for about 5 seconds, and then washed off with water without touching the face with hands. After holding the face with a towel to absorb the water, the feeling of removing dirt from the skin was evaluated by sensory evaluation and scored based on the following index.

[0081] 5 points: Dirt was thoroughly removed 4 points: Dirt was removed 3 points: Neither 2 points: Not much dirt is removed 1 point: No dirt is removed at all

[0082] The scores obtained by the 10 panelists were totaled and the degree of cleaning power 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

[0083] <Evaluation of tightness> The prepared skin cleansing liquid compositions were evaluated for their feeling of tightness by 10 panelists specializing in cosmetic evaluation. Specifically, each skin cleansing liquid composition was placed in a pump-type spray container ("Z-155-C110 (product name)" (amount sprayed per push is 0.15 g) and 1.5 g was applied by spraying directly onto the face. The composition was left for about 5 seconds, and then the face was washed with water without touching the hands to the face. The face was held with a towel to absorb the water, and 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.

[0084] 5 points: No feeling of tightness at all 4 points: Almost no feeling of tension 3 points: Only a slight feeling of tightness 2 points: Feeling of tension 1 point: Strong feeling of tension

[0085] 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 but less than 40 points ×: Less than 35 points

[0086] <Cooling sensation evaluation> The prepared skin cleansing liquid compositions were evaluated for cooling sensation by 10 people who had spent time outdoors during the daytime during the season when ultraviolet rays were strong, without using sunscreen, and had sunburned and hot skin. Specifically, each skin cleansing liquid composition was placed in a pump-type spray container ("Z-155-C110 (trade name)" (amount sprayed per push is 0.15 g) manufactured by Takemoto Container Co., Ltd., and 5 g was sprayed directly onto the entire body for application. The composition was left for about 5 seconds, and then washed off with water without touching the skin with hands. After holding the skin with a towel to absorb the water, the cooling sensation was scored by sensory evaluation based on the following index.

[0087] 3 points: Feels a very pleasant cooling sensation 2 points: Feels a pleasant cool sensation 1 point: Feels slightly cold 0 points: No cold sensation, not comfortable

[0088] 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

[0089] <Cultured epidermis skin irritation test (in vitro evaluation of skin irritation)> The prepared skin cleansing liquid composition 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 to the 24-well assay plate in 0.5 mL portions. The cultured epidermis model LabCyte EPI-MODEL24 (lot number: LCE24-180226-A) was transferred to the 24-well assay plate to which the assay medium had been added. Confirm that there were no air bubbles on the bottom of the culture cup, and then incubate with CO. 2 The plates were placed in an incubator and left to stand for at least 1 hour before exposure to the test substance.

[0090] 2. Test Substance Application and Washing Of the 24 epidermal models, 12 were used (the rest were kept in preculture until the main test). The 24-well assay plate was incubated with CO 2 The plates were removed from the 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 liquid composition for skin cleaning) was dropped onto the cultured epidermis in the culture cup without using a pump-type spray container, and the cultured epidermis was exposed to the whole surface. After 1, 5, and 10 minutes of exposure, the test substance was removed by suction, and the cultured epidermis model in the cup was washed with phosphate buffer solution (PBS) and transferred to the third row of the 24-well assay plate.

[0091] 3.MTT Test The MTT test is a method for measuring cell viability by measuring the absorbance at 570 nm after MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] taken up into cells is reduced by mitochondrial dehydrogenase to produce a formazan dye, which is extracted with an organic solvent.

[0092] 10 mL of MTT medium was prepared with 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 a 24-well assay plate and placed in a CO2 incubator to carry out the MTT reaction for 3 hours. After the MTT reaction was completed, the cultured skin was picked up 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 it for 2 hours, the microtube was vortexed to extract the pigment. The extract (200 mL) was added to each well of a 96-well plate. In addition, 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 cell viability of the test substance was calculated according to the following formula.

[0093]

number

[0094] The cell viability was classified based on the following criteria, and the 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%

[0095] As shown in Tables 1 to 4, no cleansing power was observed in the skin cleansing liquid compositions (Reference Comparative Examples 1 to 10) containing a surfactant alone at a concentration of 0.025 to 2 wt %. In contrast, the skin cleansing liquid compositions (Reference Examples 1 to 20) containing an amphiphilic ester (Reference Comparative Examples 11 to 15) that does not show cleansing power alone together with a surfactant at a concentration of 0.025 to 2 wt % showed excellent cleansing power when directly applied to the skin by spraying from a spray container, without any physical friction, and simply using the mechanical force of the liquid flow. In other words, it was demonstrated that cleansing that is gentle on the skin is possible.

[0096] As shown in Reference Examples 1 to 3, even a skin cleansing liquid composition containing more than 2% by weight of a surfactant alone can obtain excellent cleansing power simply by applying it directly to the skin by spraying. On the other hand, when the surfactant concentration is set to 2% by weight or less as shown in Reference Examples 9 to 20 in consideration of the skin irritation caused by the surfactant concentration as shown in Reference Examples 1 to 3, not only cleansing power but also excellent low irritation is achieved. In other words, it was shown that by setting the surfactant concentration of the skin cleansing liquid composition applied to the cleaning method of applying it directly to the skin by spraying to 0.025 to 2% by weight, cleaning that is physically and chemically gentle on the skin is possible. On the other hand, 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 feeling due to a cool sensation.

[0097] [Table 1]

[0098] [Table 2]

[0099] [Table 3]

[0100] [Table 4]

[0101] [Test example] Skin cleansing liquid compositions having the compositions shown in Tables 5 to 7 were prepared. Details of each component shown in Tables 5 to 7 are as shown in the Reference Test Examples. In addition, l-menthol was used as the menthol, and an ester of succinic acid and l-menthol was used as the menthyl succinate. The skin cleansing liquid compositions shown in Tables 5 to 7 were liquids, and the 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.

[0102] <Cleaning power evaluation> The prepared skin cleansing liquid compositions were evaluated for cleansing power by 10 people who spent the daytime during the season when ultraviolet rays were strong, without using sunscreen, and their skin became sunburned and hot. Specifically, each skin cleansing liquid composition was placed in a pump-type spray container (Takemoto Container Co., Ltd. "Z-155-C110 (trade name)" spray amount per push is 0.15g), and 5g was directly sprayed onto the whole body and applied. It was left for about 5 seconds, and then washed off with water without touching the skin with hands. After holding the skin with a towel to absorb the water, the feeling of removing dirt from 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: Slight stain removal 0 points: No dirt is removed at all

[0103] The scores obtained by the 10 panelists were totaled and averaged, and the degree of cleaning power 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] <Irritation sensation evaluation> The prepared skin cleansing liquid compositions were evaluated for irritation by 10 people who had spent time outdoors during the daytime during the season when ultraviolet rays were strong, without using sunscreen, and had sunburned and hot skin. Specifically, each skin cleansing liquid composition was placed in a pump-type spray container ("Z-155-C110 (trade name)" (amount sprayed per push is 0.15 g) manufactured by Takemoto Container Co., Ltd., and 5 g was sprayed directly onto the entire body for application. The composition was left for about 5 seconds, and then washed off with water without touching the skin with hands. After holding the skin with a towel to absorb the water, the irritation was scored by sensory evaluation based on the following criteria.

[0105] 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

[0106] 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

[0107] <Evaluation of tightness> The prepared skin cleansing liquid compositions were evaluated by 10 people who spent time outdoors during the daytime during the season when ultraviolet rays were strong, without using sunscreen, and their skin became sunburned and hot. Specifically, each skin cleansing liquid composition was placed in a pump-type spray container ("Z-155-C110 (trade name)" (amount sprayed per push is 0.15 g) manufactured by Takemoto Container Co., Ltd., and 5 g was directly sprayed onto the entire body for application. The composition was left for about 5 seconds, and then washed off with water without touching the skin with hands. After holding the skin with a towel to absorb the water, the sensation of tightness was evaluated by sensory evaluation based on the following index. The stronger the sensation of tightness, the more insufficient moisture was indicated.

[0108] 3 points: No feeling of tightness at all 2 points: I only felt a slight sense of tightness 1 point: I felt a sense of tightness 0 points: I felt a strong sense of tightness

[0109] 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

[0110] <Cooling sensation evaluation> The prepared skin cleansing liquid compositions were evaluated for the degree of cooling sensation in the same manner as in the Reference Test Examples. The results are shown in Tables 5 to 7.

[0111] <High temperature stability evaluation> The prepared skin cleansing liquid compositions were stored for one week at room temperature or at 50°C. After storage, the differences in appearance and odor between the skin cleansing liquid compositions stored at room temperature and those stored at 50°C were visually observed, and the high temperature stability was evaluated and scored based on the following indices. The differences in appearance and odor were evaluated based on 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 liquid compositions stored at 50°C.

[0112] 3 points: No difference was observed 2 points: Only slight differences were observed 1 point: Differences were observed 0 points: A large difference was observed

[0113] 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

[0114] As shown in Tables 5 to 7, in the skin cleansing liquid composition containing only a surfactant (Comparative Example 1), the surfactant concentration was too low, so no cleansing power was observed. In addition, in the skin cleansing liquid composition containing an amphiphilic ester (Comparative Example 3) that does not show cleansing power alone together with a surfactant (Comparative Example 2), excellent cleansing power was obtained by simply applying the amphiphilic ester (Comparative Example 3) directly to the skin by spraying from a spray container without any physical friction, but the cool sensation was not comfortable for sunburned and hot skin. In contrast, in the skin cleansing liquid composition containing an amphiphilic ester that does not show cleansing power alone together with a surfactant and also containing a cooling component, excellent cleansing power was obtained by simply applying the amphiphilic ester (Comparative Example 3) directly to the skin by spraying from a spray container without any physical friction, but the cool sensation was comfortable for sunburned and hot skin. This enabled gentle cleaning, and also provided a comfortable cool sensation for sunburned and hot skin.

[0115] In addition, all of the skin cleansing liquid compositions of the Examples and Comparative Examples were stable at room temperature with no precipitation or unpleasant odor observed. On the other hand, regarding high-temperature stability (formulation stability after storage at 50°C), precipitation of the amphiphilic ester was observed in the skin cleansing liquid composition of Example 21, and an unpleasant odor of menthol was observed in the skin cleansing liquid composition of Example 22, but the skin cleansing liquid compositions of Examples 1 to 20 were also excellent in terms of high-temperature stability.

[0116] [Table 5]

[0117] [Table 6]

[0118] [Table 7]

[0119] [Prescription example] Liquid skin cleansing compositions were prepared according to the formulations shown in Table 8. All of the skin cleansing liquid compositions had low skin irritation, excellent cleansing power, could provide a pleasant cooling sensation, and were also stable at room temperature and at high temperatures.

[0120] [Table 8]

Claims

Claim 1 A liquid skin (excluding the scalp) cleansing composition that contains (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 component, and water, is not used as makeup remover, is not foamed before application to the skin, and is used for washing without applying physical friction to the skin. Claim 2 A liquid skin (excluding the scalp) cleansing composition that contains (A) a surfactant as a cleansing component, (B) a dicarboxylic acid bis(polyoxyalkylene alkyl ether) ester, (C) a cooling component, and water, is not used as makeup remover, is not foamed before application to the skin, and is used for washing without applying physical friction to the skin. Claim 3 The liquid skin cleansing composition according to claim 1 or 2, wherein the component (A) is selected from (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 amide propyl betaine-type amphoteric surfactants, and (A4) lysophosphatidylcholine and saponin. Claim 4 The liquid skin cleansing composition according to any one of claims 1 to 3, wherein the content of the component (A) is 0.025 to 2% by weight. Claim 5 The liquid skin cleansing composition according to any one of claims 1 to 4, wherein the content of the component (A) is 0.025 to 0.9% by weight. Claim 6 The liquid skin cleansing composition according to any one of claims 1 to 5, wherein the component (C) is menthol and / or menthyl succinate. Claim 7 The liquid skin cleansing composition according to any one of claims 1 to 6, wherein the content of the component (C) is 0.001 to 0.5% by weight. Claim 8 The liquid skin cleansing composition according to any one of claims 1 to 7, which is applied to sunburned skin. Claim 9 A liquid skin cleansing composition containing (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 component, and water, which is not used as a makeup remover, and which cleans the skin (excluding the scalp) without foaming before application to the skin and without applying physical friction to the skin.

10. A liquid skin cleansing composition containing (A) a surfactant as a cleaning component, (B) a dicarboxylic acid bis(polyoxyalkylene alkyl ether) ester, (C) a cooling component, and water, which is not used as a makeup remover, and which cleans the skin (excluding the scalp) without foaming before application to the skin and without applying physical friction to the skin.

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