Oily cleansing cosmetic

Abstract

To provide an oily cleansing cosmetic capable of easily applying a proper amount of a preparation to an application site in the skin.SOLUTION: The oily cleansing cosmetic has a multilayer structure having at least a water layer and an oil layer in a standing state and is applied to the skin in a mist state. (A) at least one selected from the group consisting of a carboxylate ester having 16 to 22 carbon atoms and having a structure in which a linear carboxylic acid with 8 to 18 carbon atoms and a branched alcohol with 3 to 8 carbon atoms are dehydrated and condensed, and a dialkylether represented by the formula (I): R1 - O - R2 (I) wherein R1 and R2 each independently represent an alkyl group with 6 to 10 carbon atoms, and the total number of carbon atoms of R1 and R2 is 12 to 18; The oily cleansing cosmetic is characterized in that the nonionic surfactant contains a polyoxyethylene glycerol fatty acid ester.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-based cleansing cosmetic preparation, and more particularly to an oil-based cleansing cosmetic preparation that is useful for removing various types of dirt from the skin. [Background technology]

[0002] In recent years, makeup cosmetics that are less likely to break down due to sweat, sebum, etc. have become popular. Therefore, when removing makeup, cleansing cosmetics that are easily compatible with makeup cosmetics and have high cleansing power are needed. As cleansing cosmetics, for example, liquid oil-based cleansing cosmetics have been proposed (see, for example, Patent Document 1).

[0003] However, liquid oil-based cleansing cosmetics have the drawback that they tend to be applied to the skin in excessive amounts, which can result in excessive degreasing of the skin and lead to rough skin.

[0004] Therefore, there is a need for an oil-based cleansing cosmetic that allows an appropriate amount of the preparation to be easily applied to the application site on the skin. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-230899 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in view of the above-mentioned conventional techniques, and an object of the present invention is to provide an oil-based cleansing cosmetic preparation that allows an appropriate amount of the preparation to be easily applied to the application site on the skin. [Means for solving the problem]

[0007] The present invention provides [1] An oil-based cleansing cosmetic that has a multilayer structure having at least an aqueous layer and an oil layer in a stationary state and is to be applied to the skin in the form of a mist, (A) a carboxylic acid ester having 16 to 22 carbon atoms, which has a structure obtained by dehydration condensation of a linear carboxylic acid having 8 to 18 carbon atoms and a branched alcohol having 3 to 8 carbon atoms, and a compound represented by formula (I): R 1 -OR 2 (I) (In the formula, R 1 and R 2 each independently represents an alkyl group having 6 to 10 carbon atoms, and R 1 The number of carbon atoms and R 2 The total number of carbon atoms is 12 to 18. At least one component selected from the group consisting of dialkyl ethers represented by (B) a nonionic surfactant; an oil-based cleansing cosmetic comprising: [2] The oil-based cleansing cosmetic according to claim 1, wherein the aqueous layer contains the polyoxyethylene glycerin fatty acid ester, and the oil layer contains a nonionic surfactant other than the polyoxyethylene glycerin fatty acid ester and the component (A). Regarding. [Effects of the Invention]

[0008] According to the present invention, the excellent effect of providing an oil-based cleansing cosmetic preparation that allows an appropriate amount of the preparation to be easily applied to the application site on the skin is achieved. [Brief explanation of the drawings]

[0009] [Figure 1] 10 is a photograph, substituted for a drawing, showing the state of spray droplet particles when the oil-based cleansing cosmetic obtained in Experimental Example 7 is sprayed. [Figure 2]10 is a photograph, substituted for a drawing, showing the state of spray droplet particles when the oil-based cleansing cosmetic obtained in Comparative Experimental Example 6 is sprayed. DETAILED DESCRIPTION OF THE INVENTION

[0010] The oil-based cleansing cosmetic of the present invention has a multilayer structure having at least an aqueous layer and an oil layer in a stationary state, and is an oil-based cleansing cosmetic to be applied to the skin in the form of a mist, (A) a carboxylic acid ester having 16 to 22 carbon atoms, which has a structure obtained by dehydration condensation of a linear carboxylic acid having 8 to 18 carbon atoms and a branched alcohol having 3 to 8 carbon atoms, and a compound represented by formula (I): R 1 -OR 2 (I) (In the formula, R 1 and R 2 each independently represents an alkyl group having 6 to 10 carbon atoms, and R 1 The number of carbon atoms and R 2 The total number of carbon atoms is 12 to 18. at least one component selected from the group consisting of dialkyl ethers represented by the formula (hereinafter also referred to as "component (A)"); (B) a nonionic surfactant (hereinafter also referred to as "component (B)"); and the nonionic surfactant contains a polyoxyethylene glycerin fatty acid ester.

[0011] The oil-based cleansing cosmetic of the present invention has a multilayer structure having at least an aqueous layer and an oil layer when left standing, and therefore has both cleansing power and usability equivalent to that of an aqueous cleansing cosmetic.

[0012] The number of layers constituting the multilayer structure cannot be determined in general because it differs depending on the intended use of the oil-based cleansing cosmetic of the present invention, and therefore it is desirable to determine it appropriately depending on the intended use of the oil-based cleansing cosmetic of the present invention.

[0013] The oil-based cleansing cosmetic of the present invention contains components (A) and (B), and therefore exhibits the property of being easily misted. Therefore, the oil-based cleansing cosmetic of the present invention has good sprayability, and therefore the oil-based cleansing cosmetic of the present invention can apply an appropriate amount of preparation to the application site on the skin. Furthermore, the oil-based cleansing cosmetic of the present invention contains components (A) and (B), and therefore exhibits the property of being easily compatible with makeup stains and sebum stains. Therefore, the oil-based cleansing cosmetic of the present invention can reliably lift makeup stains and sebum stains from the skin.

[0014] In this specification, the oil-based cleansing cosmetic includes a cleansing cosmetic in which the content of oily components in the oil-based cleansing cosmetic is preferably 50% or more.In addition, in this specification, skin refers to the skin of the whole body.Skin includes, for example, the skin of the head, face, neck, limbs, trunk, etc., but the present invention is not limited to only these examples.

[0015] Component (A) is a carboxylic acid ester having 16 to 22 carbon atoms, which has a structure obtained by dehydration condensation of a linear carboxylic acid having 8 to 18 carbon atoms and a branched alcohol having 3 to 8 carbon atoms, and a compound represented by formula (I): R 1 -OR 2 (I) (In the formula, R 1 and R 2 each independently represents an alkyl group having 6 to 10 carbon atoms, and R 1 The number of carbon atoms and R 2 The total number of carbon atoms is 12 to 18. The dialkyl ether is at least one component selected from the group consisting of dialkyl ethers represented by the formula:

[0016] The carboxylic acid ester of component (A) is a compound having 16 to 22 carbon atoms and having a structure formed by dehydration condensation of a linear carboxylic acid having 8 to 18 carbon atoms and a branched alcohol having 3 to 8 carbon atoms. The carboxylic acid ester can be obtained, for example, by dehydration condensation of a linear carboxylic acid having 8 to 18 carbon atoms and a branched alcohol having 3 to 8 carbon atoms in a combination that results in a total carbon number of 16 to 22.

[0017] The number of carbon atoms in the linear carboxylic acid is 8 or more, preferably 10 or more, from the viewpoint of achieving comprehensively excellent properties in terms of sprayability and cleansing power, and is 18 or less, preferably 16 or less, more preferably 14 or less, from the viewpoint of achieving comprehensively excellent properties in terms of sprayability and cleansing power, as described above.

[0018] Examples of linear carboxylic acids having 8 to 18 carbon atoms include linear saturated monocarboxylic acids such as caprylic acid, pelargonic acid, capric acid, lauric acid, myristic acid, palmitic acid, and stearic acid; linear unsaturated monocarboxylic acids such as octenoic acid, nonenoic acid, decenoic acid, undecenoic acid, dodecenoic acid, tridecenoic acid, tetradecenoic acid, pentadecenoic acid, hexadecenoic acid, heptadecenoic acid, and octadecenoic acid; and linear unsaturated monocarboxylic acids represented by the formula (II): HOOC-R 1 -COOH (II) (In the formula, R 1 represents an alkylene group having 6 to 12 carbon atoms) a linear saturated dicarboxylic acid represented by formula (III): HOOC-R 2 -COOH (III) (In the formula, R 2 represents an alkylidene group having 6 to 12 carbon atoms or an alkylidyne group having 6 to 12 carbon atoms) Among these C8-18 straight-chain carboxylic acids, from the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability, preferred are C12-16 straight-chain monocarboxylic acids and C12-16 straight-chain dicarboxylic acids, more preferred are lauric acid, myristic acid and sebacic acid, and even more preferred are lauric acid and myristic acid.

[0019] The number of carbon atoms in the branched chain alcohol is 3 or more from the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability, and is 8 or less, preferably 7 or less, from the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability as described above.

[0020] Examples of branched alcohols having 3 to 8 carbon atoms include isopropyl alcohol, isobutyl alcohol, sec-butyl alcohol, tert-butyl alcohol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol, 3-methyl-1-butanol, 2-methyl-2-butanol, 3-methyl-2-butanol, 2,2-dimethyl-1-propanol (neopentyl alcohol), 2-hexanol, 3-hexanol, 2-methyl-1-pentanol, 3-methyl-1-pentanol, 4-methyl-1-pentanol, 2-methyl-2-pentanol, and 3-methyl-2-pentanol. Examples of alcohols include alcohol, 4-methyl-2-pentanol, 2-methyl-3-pentanol, 3-methyl-3-pentanol, 2,2-dimethyl-1-butanol, 2,3-dimethyl-1-butanol, 3,3-dimethyl-1-butanol, 2,3-dimethyl-2-butanol, 3,3-dimethyl-2-butanol, 2-ethyl-1-butanol, 2-heptanol, 3-heptanol, 2-methyl-hexanol, 2-ethyl-pentanol, 2-octanol, 3-octanol, 2-methyl-heptanol, and 2-ethylhexyl alcohol, but the present invention is not limited to these examples. Among these alcohols, isopropyl alcohol, isobutyl alcohol, 2-methyl-heptanol, and 2-ethylhexyl alcohol are preferred, and isopropyl alcohol, 2-methyl-heptanol, and 2-ethylhexyl alcohol are more preferred, from the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability.

[0021] The number of carbon atoms in the carboxylic acid ester is 16 or more, preferably 17 or more, from the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability, and is 22 or less, preferably 20 or less, from the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability, as described above.

[0022] Examples of the carboxylic acid ester include monoalkyl carboxylic acid esters and diesters, but the present invention is not limited to these examples. Examples of the monoalkyl carboxylic acid ester include alkyl laurate esters such as isopropyl laurate, methylheptyl laurate, and ethylhexyl laurate; monoalkyl myristate esters such as isopropyl myristate, methylheptyl myristate, and ethylhexyl myristate, but the present invention is not limited to these examples. Examples of the dialkyl carboxylic acid ester include dialkyl sebacate esters such as diisopropyl sebacate, but the present invention is not limited to these examples. These carboxylic acid esters may be used alone or in combination of two or more. Of these carboxylic acid esters, from the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability, isopropyl laurate, hexyl laurate, methylheptyl laurate, isopropyl myristate, ethylhexyl myristate, and diisopropyl sebacate are preferred, and isopropyl myristate, methylheptyl laurate, and diisopropyl sebacate are more preferred.

[0023] The dialkyl ether of component (A) is represented by formula (I): R 1 -OR 2 (I) (In the formula, R 1 and R 2 each independently represents an alkyl group having 6 to 10 carbon atoms, and R 1 The number of carbon atoms and R 2 The total number of carbon atoms is 12 to 18. It is a compound represented by the formula:

[0024] In formula (I), R 1 and R 2are each independently an alkyl group having 6 to 10 carbon atoms. From the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability, the number of carbon atoms in the alkyl group is 6 or more, preferably 7 or more, and from the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability, as above, the number of carbon atoms in the alkyl group is 10 or less, preferably 9 or less.

[0025] Examples of alkyl groups having 6 to 10 carbon atoms include n-hexyl, isohexyl, cyclohexyl, n-heptyl, cycloheptyl, methylcyclohexyl, n-octyl, cyclooctyl, n-nonyl, 3,3,5-trimethylcyclohexyl, n-decyl, and cyclodecyl groups, but the present invention is not limited to these examples. Among these alkyl groups, from the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability, n-hexyl, n-heptyl, n-octyl, n-nonyl, and n-decyl are preferred, and n-heptyl, n-octyl, and n-nonyl are more preferred.

[0026] In formula (I), R 1 The number of carbon atoms and R 2 The total number of carbon atoms is 12 or more, preferably 13 or more, from the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability, and is 18 or less, preferably 17 or less, from the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability, as described above.

[0027] Examples of the dialkyl ether include dihexyl ether, diheptyl ether, dioctyl ether (dicaprylyl ether), dinonyl ether, etc., but the present invention is not limited to these examples. These dialkyl ethers may be used alone or in combination of two or more. Among these dialkyl ethers, dioctyl ether is preferred from the viewpoint of improving mist dispersibility and mist fineness to enhance sprayability.

[0028] The content of component (A) in the oil-based cleansing cosmetic of the present invention varies depending on the intended use of the oil-based cleansing cosmetic of the present invention and cannot be determined in general terms. Therefore, it is desirable to determine it appropriately depending on the intended use of the oil-based cleansing cosmetic of the present invention.

[0029] Component (B) is a nonionic surfactant. The HLB value of the nonionic surfactant cannot be determined in general because it varies depending on the use of the oil-based cleansing cosmetic composition of the present invention, the properties and appearance required for the oil-based cleansing cosmetic composition of the present invention, etc., and therefore it is desirable to appropriately determine the HLB value depending on the use of the oil-based cleansing cosmetic composition of the present invention, the properties and appearance required for the oil-based cleansing cosmetic composition of the present invention, etc.

[0030] Examples of the nonionic surfactant include glycerin fatty acid esters such as glyceryl laurate; polyoxyethylene sorbitol fatty acid esters such as sorbeth-3 isostearate, sorbeth-30 tetraoleate, sorbeth-40 tetraoleate, and sorbeth-40 pentaoleate; polyglyceryl-3 isostearate, polyglyceryl-4 isostearate, polyglyceryl-5 isostearate, polyglyceryl-2 isopalmitate, polyglyceryl-4 oleate, polyglyceryl-5 oleate, and diisostearate. Polyglycerin fatty acid esters such as Polyglyceryl-10 Phosphate, Polyglyceryl-10 Dioleate, Polyglyceryl-10 Distearate, Polyglyceryl-3 Stearate, Polyglyceryl-4 Stearate, Polyglyceryl-5 Stearate, Polyglyceryl-10 Cocoate, Polyglyceryl-2 Myristate, Polyglyceryl-3 Myristate, and Polyglyceryl-2 Laurate; PEG-10 Isostearate, PEG-6 Isostearate, PEG-8 Isostearate, PEG-10 Oleate, and PEG Oleate -11, polyethylene glycol fatty acid esters such as PEG-6 oleate, PEG-7 oleate, PEG-8 oleate, PEG-9 oleate, PEG-20 dioleate, PEG-20 distearate, PEG-12 dilaurate, PEG-16 dilaurate, PEG-10 stearate, PEG-6 stearate, PEG-7 stearate, PEG-8 stearate, PEG-9 stearate, PEG-6 palmitate, PEG-4 laurate, PEG-5 laurate, and PEG-6 laurate; isosteareth-10, isocetate polyethylene glycol alkyl ethers such as ceteth-10, oleth-10, oleth-12, oleth-8, steareth-10, steareth-11, steareth-12, steareth-8, ceteareth-10, ceteareth-11, ceteareth-6, ceteareth-7, ceteareth-9, ceteth-10, ceteth-6, ceteth-7, trideceth-5, trideceth-6, trideceth-7, trideceth-8, beheneth-10, laureth-4, laureth-5, and laureth-7; polyethylene glycol castor oils such as PEG-20 castor oil and PEG-30 castor oil;Examples of suitable nonionic surfactants include polyethylene glycol hydrogenated castor oils such as PEG-20 hydrogenated castor oil, PEG-30 hydrogenated castor oil, PEG-30 hydrogenated castor oil isostearate, PEG-40 hydrogenated castor oil isostearate, PEG-50 hydrogenated castor oil triisostearate, PEG-60 hydrogenated castor oil triisostearate, PEG-30 hydrogenated castor oil laurate, and PEG-40 hydrogenated castor oil laurate; and polyoxyethylene glycerin fatty acid esters, but the present invention is not limited to these examples. These nonionic surfactants may be used alone or in combination of two or more. Among these nonionic surfactants, polyoxyethylene sorbitol fatty acid esters and polyoxyethylene glycerin fatty acid esters are preferred from the viewpoint of obtaining an oil-based cleansing cosmetic composition that is excellent in overall cleansing properties and sprayability. Among the polyoxyethylene sorbitol fatty acid esters, from the viewpoint of obtaining an oil-based cleansing cosmetic composition that is excellent overall in cleansing properties and sprayability, sorbeth-3 isostearate, sorbeth-30 tetraoleate, sorbeth-40 tetraoleate, and sorbeth-40 pentaoleate are more preferred, and sorbeth-30 tetraoleate and sorbeth-40 tetraoleate are even more preferred.

[0031] In the oil-based cleansing cosmetic of the present invention, the component (B) contains the polyoxyethylene glycerin fatty acid ester, from the viewpoint of improving the rinsing properties.

[0032] From the viewpoint of improving rinsing properties, the fatty acid constituting the polyoxyethylene glycerin fatty acid ester is preferably a fatty acid having 8 to 22 carbon atoms. Examples of fatty acids having 8 to 22 carbon atoms include saturated fatty acids having 8 to 22 carbon atoms, such as octanoic acid (caprylic acid), nonanoic acid, decanoic acid (capric acid), dodecanoic acid (lauric acid), tetradecanoic acid (myristic acid), hexadecanoic acid (palmitic acid), octadecanoic acid (stearic acid, isostearic acid), eicosanoic acid (arachidic acid), and docosanoic acid (behenic acid); unsaturated fatty acids having 8 to 22 carbon atoms, such as tetradecenoic acid (myristoleic acid), hexadecenoic acid (palmitoleic acid), octadecenoic acid (oleic acid), octadecadienoic acid (linoleic acid), and octadecatrienoic acid (linolenic acid); and mixed fatty acids, such as coconut oil fatty acid and palm oil fatty acid, but the present invention is not limited to these examples.

[0033] The average number of moles of oxyethylene groups added in the polyoxyethylene glycerin fatty acid ester is preferably 2 or more, more preferably 3 or more, and even more preferably 4 or more, from the viewpoint of improving the rinsing ability and further reducing the oily feeling after rinsing, and is preferably 10 or less, more preferably 9 or less, and even more preferably 8 or less, from the viewpoint of improving the rinsing ability and further reducing the oily feeling after rinsing, as described above.

[0034] Examples of the polyoxyethylene glycerin fatty acid esters include polyoxyethylene glyceryl oleates such as PEG-10 glyceryl oleate and PEG-15 glyceryl oleate; polyoxyethylene glyceryl trioleates such as PEG-40 glyceryl trioleate and PEG-50 glyceryl trioleate; polyoxyethylene glyceryl stearates such as PEG-10 glyceryl stearate, PEG-15 glyceryl stearate and PEG-5 glyceryl stearate; and polyoxyethylene glyceryl isostearate such as PEG-15 glyceryl isostearate and PEG-20 glyceryl isostearate. polyoxyethylene glyceryl diisostearate such as PEG-30 glyceryl diisostearate; polyoxyethylene glyceryl triisostearate such as PEG-30 glyceryl triisostearate, PEG-40 glyceryl triisostearate, PEG-50 glyceryl triisostearate, PEG-60 glyceryl triisostearate; polyoxyethylene glyceryl cocoate such as PEG-7 glyceryl cocoate; polyoxyethylene glyceryl laurate such as PEG-8 glyceryl laurate, PEG-9 glyceryl laurate, etc., but the present invention is not limited to these examples.

[0035] The content of nonionic surfactants other than the polyoxyethylene glycerin fatty acid esters in component (B) of the oil-based cleansing cosmetic of the present invention, i.e., the content of nonionic surfactants other than the polyoxyethylene glycerin fatty acid esters in the oil-based cleansing cosmetic of the present invention, varies depending on the intended use of the oil-based cleansing cosmetic of the present invention and cannot be determined in general, so it is desirable to determine it appropriately depending on the intended use of the oil-based cleansing cosmetic of the present invention. The content of nonionic surfactants other than the polyoxyethylene glycerin fatty acid esters in the oil-based cleansing cosmetic of the present invention is, for example, preferably 1% by mass or more, more preferably 1.5% by mass or more, and even more preferably 1.9% by mass or more, from the viewpoint of increasing affinity with makeup stains and sebum stains and improving stain removal properties, and is preferably 6% by mass or less, more preferably 5.5% by mass or less, even more preferably 3% by mass or less, and even more preferably 2.7% by mass or less, from the viewpoint of increasing affinity with makeup stains and sebum stains and improving stain removal properties, as described above.

[0036] Furthermore, the content of the polyoxyethylene glycerin fatty acid ester in the oil-based cleansing cosmetic of the present invention cannot be determined in general terms because it differs depending on the use of the oil-based cleansing cosmetic of the present invention, the properties such as rinse-off ability required for the oil-based cleansing cosmetic of the present invention, the appearance, etc., and therefore it is desirable to determine it appropriately depending on the use of the oil-based cleansing cosmetic of the present invention, the properties such as rinse-off ability required for the oil-based cleansing cosmetic of the present invention, the appearance, etc.

[0037] From the viewpoint of improving rinsing properties, the oil-based cleansing cosmetic of the present invention is preferably an oil-based cleansing cosmetic in which the aqueous layer contains the polyoxyethylene glycerin fatty acid ester, and the oil layer contains a nonionic surfactant other than the polyoxyethylene glycerin fatty acid ester and the component (A) (hereinafter referred to as "oil-based cleansing cosmetic A"). Hereinafter, the aqueous layer and oil layer of oil-based cleansing cosmetic A will be described as an example, but the present invention is not limited to only such aqueous layer and oil layer.

[0038] The aqueous layer of oil-based cleansing cosmetic A refers to a layer containing an aqueous medium. The aqueous layer of oil-based cleansing cosmetic A contains a polyoxyethylene glycerin fatty acid ester. Because the aqueous layer of oil-based cleansing cosmetic A contains a polyoxyethylene glycerin fatty acid ester, makeup stains and sebum stains that have been lifted from the skin by the oily components and the like contained in the oil layer of oil-based cleansing cosmetic A can be easily washed away with water and the like.

[0039] The content of polyoxyethylene glycerin fatty acid ester in the aqueous layer of oil-based cleansing cosmetic A varies depending on the intended use of oil-based cleansing cosmetic A and cannot be determined in general terms. Therefore, it is desirable to determine it appropriately depending on the intended use of oil-based cleansing cosmetic A.

[0040] As described above, the water layer of the oil-based cleansing cosmetic A contains an aqueous medium. Since the water layer of the oil-based cleansing cosmetic A contains an aqueous medium, the oil-based cleansing cosmetic A suppresses the occurrence of turbidity when the water layer and the oil layer are mixed. Therefore, the oil-based cleansing cosmetic of the present invention exhibits excellent aesthetics even when the water layer and the oil layer are mixed during use, and can be more easily converted into a mist. Furthermore, the oil-based cleansing cosmetic A can further suppress the feeling of residual oil after rinsing with water.

[0041] Examples of aqueous media include water; water-soluble polyhydric alcohols such as glycerin, ethylene glycol, diethylene glycol, propylene glycol, propanediol, dipropylene glycol, 1,3-butylene glycol, hexylene glycol, erythritol, xylitol, sorbitol, and inositol; and lower alcohols such as ethanol, but the present invention is not limited to these examples. Among these aqueous media, from the viewpoint of improving rinsability, water and water-soluble polyhydric alcohols are preferred, water, glycerin, and 1,3-butylene glycol are preferred, and water and 1,3-butylene glycol are more preferred.

[0042] The content of the aqueous medium in the water layer cannot be determined in general because it varies depending on the intended use of the oil-based cleansing cosmetic A, and therefore it is desirable to determine it appropriately depending on the intended use of the oil-based cleansing cosmetic A.

[0043] In the aqueous layer of oil-based cleansing cosmetic A, the mass ratio [(C) / (D)] of the polyoxyethylene glycerin fatty acid ester [also referred to as component (C)] to the aqueous medium [also referred to as component (D)] is preferably 2 or more, more preferably 2.5 or more, from the viewpoint of enhancing the aesthetic appeal (transparency) of the mixture when the oil layer and the aqueous layer are mixed, and is preferably 5 or less, more preferably 4.5 or less, from the viewpoint of enhancing the aesthetic appeal (transparency) of the mixture when the oil layer and the aqueous layer are mixed.

[0044] The aqueous layer of the oil-based cleansing cosmetic A may be composed only of a polyoxyethylene glycerin fatty acid ester and an aqueous medium, and may further contain, in addition to the polyoxyethylene glycerin fatty acid ester and the aqueous medium, for example, a surfactant other than the polyoxyethylene glycerin fatty acid ester, a thickener, a preservative, a cooling agent, a water-soluble functional ingredient, etc., as long as the object of the present invention is not impaired.

[0045] The oil layer of oil-based cleansing cosmetic A contains the components (A) and (B). Such an oil layer can be formed, for example, by mixing the components (A) and (B). The oil-based cleansing cosmetic A exhibits properties that allow it to easily blend with makeup and sebum stains. Therefore, the oil-based cleansing cosmetic A can blend with makeup and sebum stains and reliably lift these stains from the skin, thereby providing excellent cleansing power. Furthermore, since the components (A) and (B) are used in the oil layer of the oil-based cleansing cosmetic A, when the oil layer and the water layer are mixed during use, fine droplets are easily generated, resulting in a mixture that combines both good mist dispersibility and good mist fineness and has excellent sprayability. Therefore, oil-based cleansing cosmetic A exhibits excellent ease of discharge, and also exhibits the excellent properties of being able to easily apply an appropriate amount of the preparation to the application site on the skin and to evenly blend with various types of dirt on the skin.

[0046] The oil layer of the oil-based cleansing cosmetic A may contain a polyoxyethylene glycerin fatty acid ester as the component (B) nonionic surfactant, or may not contain a polyoxyethylene glycerin fatty acid ester (i.e., it may contain a nonionic surfactant other than a polyoxyethylene glycerin fatty acid ester). When the oil layer contains a polyoxyethylene glycerin fatty acid ester as component (B), the polyoxyethylene glycerin fatty acid ester used in the oil layer may be different from the polyoxyethylene glycerin fatty acid ester used in the aqueous layer, from the viewpoint of improving the appearance of the oil-based cleansing cosmetic A. In this case, the oil layer of the oil-based cleansing cosmetic A may use a polyoxyethylene glycerin fatty acid ester having properties (e.g., HLB value, etc.) suitable for the oil layer, and the aqueous layer may use a polyoxyethylene glycerin fatty acid ester having properties (e.g., HLB value, etc.) suitable for the aqueous layer.

[0047] In the oil phase of the oil-based cleansing cosmetic A, the mass ratio [(A) / (B)] of the component (A) to the component (B) cannot be determined in general because it differs depending on the intended use of the oil-based cleansing cosmetic A. Therefore, it is desirable to determine it appropriately depending on the intended use of the oil-based cleansing cosmetic A. From the viewpoint of improving sprayability, the mass ratio [(A) / (B)] is preferably 15 or more, more preferably 18 or more, and even more preferably 25 or more, and from the viewpoint of improving cleansing ability, it is preferably 99 or less, more preferably 90 or less, more preferably 80 or less, even more preferably 70 or less, and even more preferably 60 or less.

[0048] The oil layer of the oil-based cleansing cosmetic A may be composed only of the component (A) and the component (B), and may further contain, for example, an oily base other than the component (A), a surfactant other than the component (B), a thickener, a preservative, a cooling agent, an oil-soluble functional component, etc., as long as the object of the present invention is not impaired.

[0049] The ratio of the oil layer to the aqueous layer in the oil-based cleansing cosmetic of the present invention [oil layer / aqueous layer (mass ratio)] varies depending on the intended use of the oil-based cleansing cosmetic of the present invention and cannot be determined in general, so it is desirable to determine it appropriately depending on the intended use of the oil-based cleansing cosmetic of the present invention. The oil layer / aqueous layer (mass ratio) in the oil-based cleansing cosmetic of the present invention is preferably 2 or more, more preferably 2.5 or more, and even more preferably 3 or more, from the viewpoint of improving the aesthetics (transparency) of the oil-based cleansing cosmetic of the present invention when the oil layer and the aqueous layer are mixed, and is preferably 9 or less, more preferably 8.5 or less, and even more preferably 7 or less, from the viewpoint of improving the aesthetics (transparency) of the oil-based cleansing cosmetic of the present invention when the oil layer and the aqueous layer are mixed, as described above.

[0050] The oil-based cleansing cosmetic A of the present invention comprises an oil layer and an aqueous layer that is separated from the oil layer when left to stand, i.e., it has at least an oil layer and an aqueous layer when left to stand, and therefore has both cleansing power and usability equivalent to that of an aqueous cleansing cosmetic.

[0051] The oil-based cleansing cosmetic of the present invention can be produced, for example, by combining a mixture of ingredients to be used in the oil phase with a mixture of ingredients to be used in the aqueous phase.

[0052] The oil-based cleansing cosmetic of the present invention may further contain, for example, an oily component other than component (A); a surfactant other than the nonionic surfactant component (B); a thickener; a preservative; a cooling agent; an oil-soluble functional component, etc., within a range that does not impair the object of the present invention.

[0053] The oil-based cleansing cosmetic of the present invention can be used by filling it into a spray container, for example. The capacity of the spray container and the inner diameter of the spray nozzle of the spray container vary depending on the intended use of the oil-based cleansing cosmetic of the present invention and therefore cannot be determined in general terms. Therefore, it is desirable to determine them appropriately depending on the intended use of the oil-based cleansing cosmetic of the present invention.

[0054] A method for using the oil-based cleansing cosmetic of the present invention includes, for example, a method comprising the steps of mixing the oil layer and the aqueous layer, then spraying the mixture onto the surface of the skin of the head, face, neck, limbs, trunk, etc., allowing the sprayed oil-based cleansing cosmetic to blend with makeup cosmetics applied to the skin and sebum on the skin, and rinsing it off with water or lukewarm water; however, the present invention is not limited to these examples.

[0055] The oil-based cleansing cosmetic of the present invention can be used by mixing the oil layer and the water layer, and the resulting mixture can be easily misted, so that an appropriate amount of the preparation can be easily applied to the application site on the skin.Furthermore, the oil-based cleansing cosmetic of the present invention is excellent in sprayability, ease of discharge, and washability overall.Therefore, the oil-based cleansing cosmetic of the present invention can easily apply an appropriate amount of the preparation to the application site on the skin, and the residual oily feeling of the preparation after rinsing with water is suppressed, and the effect of excellent washability and usability is exhibited.Therefore, it can be suitably used for removing cosmetic stains and sebum stains caused by makeup cosmetics on the surface of the skin. [Example]

[0056] Next, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

[0057] Experimental Examples 1 to 6 and Comparative Experimental Examples 1 to 5 Approximately 20 mL of each of the components shown in Table 1 was filled into a 30 mL spray container equipped with a spray nozzle. The spray containers filled with the components of Experimental Examples 1 to 6 and Comparative Experimental Examples 1 to 5 are collectively referred to as "test spray container A."

[0058] [Table 1]

[0059] (Evaluation of sprayability) Test spray container A was placed so that the tip of the spray nozzle was located 15 cm from the inside of one forearm of each of 10 expert panelists with the same level of proficiency in evaluation skills. After mixing the contents of test spray container A, the push button was pressed once to apply the contents (approximately 0.14 mL) to the forearm. The expert panelists were asked to evaluate the feel on the forearm when sprayed and the spread of the sprayed droplets according to the following evaluation criteria. The evaluation results, which were consistent across at least seven expert panelists, are shown in Table 2. <Evaluation criteria> ⊚: The spray droplets were spread evenly over a wide area, and the contact sensation of the particles on the skin was extremely soft. ○: The spray droplets were spread sufficiently and evenly. △: The spray droplets were concentrated in a biased area, and the contact sensation of the particles with the skin was relatively strong. ×: The droplets were not in a fine mist form, the spray range was extremely narrow, and the particles felt strongly in contact with the skin.

[0060] [Table 2]

[0061] The results shown in Table 2 indicate that the components of Experimental Examples 1 to 6 produced fine, evenly distributed spray droplets that softly contacted the skin, resulting in oil-based cleansing cosmetics with excellent sprayability. In contrast, the components of Comparative Experimental Examples 1 to 5 produced spray droplets that concentrated in a biased area, resulting in relatively strong contact with the skin, or the droplets did not form a mist. These results indicate that esters with 16 to 22 carbon atoms, each having a structure formed by dehydration condensation of a linear monocarboxylic acid having 8 to 18 carbon atoms or a linear dicarboxylic acid having 8 to 18 carbon atoms with a branched alcohol having 3 to 8 carbon atoms, can be suitably used in oil-based cleansing cosmetics to be applied to the skin in the form of a mist.

[0062] Experimental Example 7 and Comparative Experimental Example 6 The components were mixed in a conventional manner to obtain the compositions shown in Table 3, thereby obtaining oil-based cleansing cosmetics (Experimental Example 7 and Comparative Experimental Example 6). Approximately 20 mL of the oil-based cleansing cosmetics obtained in Experimental Example 7 and Comparative Experimental Example 6 were each filled into a 30 mL container equipped with a spray nozzle. The spray containers filled with the oil-based cleansing cosmetics of Experimental Example 7 and Comparative Experimental Example 6 are collectively referred to as "test spray container B."

[0063] [Table 3]

[0064] Test spray container B was placed in front of a black plate. The push button on test spray container B was pressed once, and the state of the sprayed droplets when the contents of test spray container B (approximately 0.14 mL) were sprayed was photographed with a smartphone camera. Figure 1 shows the results of observing the state of the sprayed droplets when the oil-based cleansing cosmetic obtained in Experimental Example 7 was sprayed, and Figure 2 shows the results of observing the state of the sprayed droplets when the oil-based cleansing cosmetic obtained in Comparative Experimental Example 6 was sprayed. In the figures, the white arrow indicates the spray direction of the oil-based cleansing cosmetic.

[0065] 1 and 2, it can be seen that the oil-based cleansing cosmetic obtained in Experimental Example 7 has fine spray droplets spread evenly over a wide area, while the oil-based cleansing cosmetic obtained in Comparative Experimental Example 6 has large droplets concentrated in a biased area. These results show that the oil-based cleansing cosmetic obtained in Experimental Example 7 has the property of easily generating fine droplets, and has both good mist dispersion and good mist fineness, resulting in excellent sprayability. Therefore, it can be seen that the oil-based cleansing cosmetic obtained in Experimental Example 7 can easily apply an appropriate amount of formulation evenly to the application site on the skin.

[0066] Experimental Examples 8 to 12 and Comparative Experimental Examples 7 to 8 The components were mixed according to standard methods to obtain the compositions shown in Table 4 to obtain oil-based cleansing cosmetics (Experimental Examples 8-12 and Comparative Experimental Examples 7-8). Approximately 20 mL of the oil-based cleansing cosmetics obtained in Experimental Examples 8-12 and Comparative Experimental Examples 7-8 were each filled into a 30 mL container equipped with a spray nozzle. The spray containers filled with the oil-based cleansing cosmetics of Experimental Examples 8-12 and Comparative Experimental Examples 7-8 are collectively referred to as "test spray container C."

[0067] The oil-based cleansing cosmetics obtained in Experimental Examples 8-12 and Comparative Experimental Examples 7-8 were evaluated in the same manner as in the evaluation of sprayability in Experimental Examples 1-6 and Comparative Experimental Examples 1-5, except that test spray container C was used instead of test spray container A in Experimental Examples 1-6 and Comparative Experimental Examples 1-5. The results are shown in Table 4.

[0068] [Table 4]

[0069] The results shown in Table 4 indicate that the oil-based cleansing cosmetics obtained in Experimental Examples 8 to 12 have excellent sprayability, as the spray droplets are fine and spread evenly over a wide area, making soft contact with the skin. In contrast, the oil-based cleansing cosmetics obtained in Comparative Experimental Examples 7 and 8 have poor sprayability, as the spray droplets are concentrated in a biased area and make relatively strong contact with the skin, or the droplets do not form a mist.

[0070] Examples 1 to 11 and Comparative Examples 1 to 2 The ingredients of each layer were mixed in a conventional manner to obtain the composition shown in Table 5, thereby obtaining oil-based cleansing cosmetics (Examples 1 to 11 and Comparative Examples 1 and 2) having an oil layer and an aqueous layer that separated when left to stand, i.e., having an oil layer and an aqueous layer when left to stand. Approximately 20 mL of the oil-based cleansing cosmetics obtained in Examples 1 to 11 and Comparative Examples 1 and 2 were each filled into a 30 mL container equipped with a spray nozzle. The spray containers filled with the oil-based cleansing cosmetics of Examples 1 to 11 and Comparative Examples 1 and 2 are collectively referred to as "test spray container D."

[0071] (Evaluation of sprayability) The oil-based cleansing cosmetics obtained in Examples 1 to 11 and Comparative Examples 1 and 2 were evaluated in the same manner as in the evaluation of sprayability in Experimental Examples 1 to 4 and Comparative Experimental Examples 1 to 5, except that test spray container D was used instead of test spray container A.

[0072] (Ease of dispensing) Ten expert panelists with the same level of proficiency in evaluation skills mixed the contents of test spray container D and pressed the push button once. The expert panelists evaluated the ease of dispensing when the push button was pressed once according to the following evaluation criteria. The evaluation results, which were consistent across at least seven expert panelists, are shown in Table 5. <Evaluation criteria> ○: The load on the finger when pressing the push button was extremely small, and the oil-based cleansing cosmetic was easily dispensed. ×: A large load was placed on the finger when the push button was pressed, making it difficult to dispense the oil-based cleansing cosmetic.

[0073] (Evaluation of washability) Test spray container D was placed so that the tip of the spray nozzle was positioned 15 cm from the inside of one forearm of each of 10 expert panelists with the same level of proficiency in evaluation skills. The push button was pressed once to apply the oil-based cleansing cosmetic to the forearm. 10 minutes after application, the oil-based cleansing cosmetic was rinsed off with water (20°C). The expert panelists were asked to evaluate the residual oily feeling on the forearm after rinsing with water according to the following evaluation criteria. The evaluation results, which were consistent across at least seven expert panelists, are shown in Table 5. <Evaluation criteria> ⊚: No residual oily feeling was felt on the skin. ○: Almost no residual oily feeling was felt on the skin. △: There was a slight residual oily feeling on the skin. ×: There was a strong residual oily feeling on the skin.

[0074] [Table 5]

[0075] The results shown in Table 5 indicate that the oil-based cleansing cosmetics obtained in Examples 1 to 12 are comprehensively excellent in terms of sprayability, ease of dispensing, and rinsing ability. In contrast, the oil-based cleansing cosmetics obtained in Comparative Examples 1 and 2 are inferior in terms of sprayability, ease of dispensing, and rinsing ability. Furthermore, when the contents of test spray container D were mixed, the oil-based cleansing cosmetics obtained in Examples 1 to 12 produced a transparent mixture with a good appearance, while the oil-based cleansing cosmetic obtained in Comparative Example 1 produced a cloudy mixture. Furthermore, all panelists evaluated that the oil-based cleansing cosmetics obtained in Examples 1 to 11 did not cause any tightness on the skin after rinsing. Furthermore, even when the concentration of each component was adjusted to the concentration of each component in Examples 1 to 12 and the oil layer and aqueous layer were mixed so that the oil layer / aqueous layer (mass ratio) was 50 / 50 (= 1) and 60 / 40 (= 1.5), there was a tendency for excellent performance to be obtained similar to that of the oil-based cleansing agents obtained in Examples 1 to 12. Furthermore, even when essential oils and other oily components were added to the oil layer and plant extracts and other aqueous components were added to the aqueous layer, there was a tendency for excellent performance to be obtained similar to that of the oil-based cleansing agents obtained in Examples 1 to 12.

[0076] As explained above, the oil-based cleansing cosmetic of the present invention has good sprayability, and can be used in an appropriate amount without applying an excessive amount of preparation to the skin at one time.In addition, the oil-based cleansing cosmetic of the present invention has excellent dischargeability, and reduces the burden on the user's fingers when using the oil-based cleansing cosmetic.Furthermore, since the oil-based cleansing cosmetic of the present invention has good washability, the oil-based cleansing cosmetic of the present invention can suppress the residual oily feeling of the preparation and the tight feeling on the skin after washing off with water etc.Therefore, according to the present invention, it is possible to provide an oil-based cleansing cosmetic that is comprehensively excellent in sprayability, dischargeability and washability, and is easier for users to use.

Claims

1. An oil-based cleansing cosmetic composition having a multilayer structure having at least an aqueous layer and an oil layer in a stationary state, the oil-based cleansing cosmetic composition being to be applied to the skin in the form of a mist, (A) a carboxylic acid ester having 16 to 22 carbon atoms, which has a structure obtained by dehydration condensation of a linear carboxylic acid having 8 to 18 carbon atoms and a branched alcohol having 3 to 8 carbon atoms, and a compound represented by formula (I): R １ -O-R ２ (I) (In the formula, R １ and R ２ each independently represents an alkyl group having 6 to 10 carbon atoms; R １ The number of carbon atoms and R ２ The total number of carbon atoms is 12 to 18. At least one component selected from the group consisting of dialkyl ethers represented by (B) a nonionic surfactant; wherein the nonionic surfactant contains a polyoxyethylene glycerin fatty acid ester.

2. 2. The oil-based cleansing cosmetic according to claim 1, wherein the aqueous layer contains the polyoxyethylene glycerin fatty acid ester, and the oil layer contains a nonionic surfactant other than the polyoxyethylene glycerin fatty acid ester and the component (A).

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