W / O type emulsion composition

Abstract

To provide a W / O emulsion composition that exhibits excellent storage stability under temperature cycling conditions.SOLUTION: This W / O emulsion composition contains the following components (A), (B), (C), (D), and (E): (A) a glycerin monofatty acid ester having 12 to 26 carbon atoms; (B) a higher alcohol having 10 to 22 carbon atoms; (C) a ceramide; (D) one or more selected from a sphingosine, a salt thereof, and an ionic surfactant; and (E) a nonionic surfactant containing (e1) one or more selected from a cross-linked polyether-modified silicone and a cross-linked polyglycerin-modified silicone, and (e2) one or more selected from a polyether-modified silicone, a polyglycerol-modified silicone, and a polyglycerin fatty acid ester.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a W / O emulsion composition. [Background technology]

[0002] Ceramides are a type of sphingolipid found in high concentrations in cell membranes. They are known to play an important role in maintaining the skin's softness and moisture by forming a lipid barrier as a key component of interstitial cell lipids. They are also effective ingredients in topical skin preparations that increase the moisture-retaining capacity of the stratum corneum, which is one way to improve rough skin.

[0003] Because such ceramides are highly crystalline and difficult to stably incorporate into emulsion systems, several studies have been reported: an O / W / O emulsion cosmetic in which an O / W emulsion composition containing ceramide and phospholipid is dispersed in an oil phase containing a silicone surfactant (Patent Document 1); a double emulsion cosmetic composition in which ceramides are first made into an O / W emulsion and then mixed with a liquid oil and a lipophilic emulsifier to form an O / W / O emulsion (Patent Document 2); and a water-in-oil emulsion skin preparation containing ceramide, an organically modified clay mineral, an N-acylglutamic acid diester, and a phytosterol (Patent Document 3). Furthermore, an O / W / O skin preparation containing ceramides, a glycerin mono-fatty acid ester, a higher alcohol, a sphingosine salt, or an ionic surfactant has also been reported (Patent Document 4). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-273747 [Patent Document 2] Japanese Patent Application Publication No. 03-47108 [Patent Document 3] Special Publication No. 2010-513221 [Patent Document 4] Japanese Patent Application Laid-Open No. 2016-104730 Summary of the Invention [Problem to be solved by the invention]

[0005] The O / W / O type topical skin preparation described in Patent Document 4 inhibits crystallization of ceramides during low-temperature storage, has emulsion stability, and provides a good feeling of protection and smoothness to the skin when applied to the skin. However, when actually launching this product on the market, further improvement in storage stability under temperature cycle conditions that may occur during distribution is desired. Therefore, the present invention provides a W / O type emulsion composition that contains ceramides, has excellent storage stability under temperature cycle conditions, and provides a good feel when applied to the skin. [Means for solving the problem]

[0006] Therefore, the present inventors conducted extensive research on the O / W / O type topical skin preparation of Patent Document 4, which contains ceramides, and discovered that by incorporating two specific types of nonionic surfactants in combination, a W / O type emulsion composition can be obtained that has excellent storage stability under temperature cycle conditions and a good feel when applied to the skin, and thus completed the present invention.

[0007] That is, the present invention provides a composition comprising the following components (A), (B), (C), (D) and (E): (A) glycerin mono-fatty acid ester having 12 to 26 carbon atoms, (B) a higher alcohol having 10 to 22 carbon atoms; (C) Ceramides, (D) one or more selected from sphingosine and its salts, and ionic surfactants; (E) A nonionic surfactant containing the following (e1) and (e2): (e1) One or more selected from crosslinked polyether-modified silicones and crosslinked polyglycerin-modified silicones (e2) One or more selected from polyether-modified silicone, polyglycerin-modified silicone, and polyglycerin fatty acid ester The present invention provides a W / O type emulsion composition containing the above. [Effects of the Invention]

[0008] The W / O emulsion composition of the present invention has excellent emulsion system stability even after temperature cycle storage, and also has excellent usability, such as richness and good spreadability, when applied to the skin. DETAILED DESCRIPTION OF THE INVENTION

[0009] The W / O emulsion composition of the present invention is a composition containing the following components (A) to (E). (A) glycerin mono-fatty acid ester having 12 to 26 carbon atoms, (B) a higher alcohol having 10 to 22 carbon atoms; (C) Ceramides, (D) one or more selected from sphingosine and its salts, and ionic surfactants; (E) A nonionic surfactant containing the following (e1) and (e2): (e1) One or more selected from crosslinked polyether-modified silicones and crosslinked polyglycerin-modified silicones (e2) One or more selected from polyether-modified silicone, polyglycerin-modified silicone, and polyglycerin fatty acid ester

[0010] (Component (A)) Component (A) is a glycerin mono-fatty acid ester having 12 to 26 carbon atoms. The number of carbon atoms in component (A) is preferably 14 or more, more preferably 16 or more, and is preferably 24 or less, even more preferably 22 or less, from the viewpoints of suppressing precipitation of component (C) described below and imparting a favorable feeling when used.

[0011] Specific examples of component (A) include glycerin monolaurate, glycerin monomyristate, glycerin monopalmitate, glycerin monostearate, glycerin monobehenate, glycerin monooleate, glycerin monoisostearate, glycerin monoarachidate, glycerin monolinoleate, etc. Among these, from the above-mentioned viewpoint, at least one selected from the group consisting of glycerin monobehenate, glycerin monostearate, and glycerin monopalmitate is preferred, with glycerin monobehenate being more preferred.

[0012] In this embodiment, component (A) may be used alone or in combination of two or more. In this embodiment, the content of component (A) in the emulsion composition is preferably 0.05 to 12% by mass, more preferably 0.2 to 10% by mass, even more preferably 0.2 to 7% by mass, even more preferably 0.2 to 4% by mass, still more preferably 0.3 to 2% by mass, even more preferably 0.3 to 1.0% by mass, and even more preferably 0.4 to 0.8% by mass, based on the total mass of the emulsion composition, from the viewpoints of improving the emulsion stability of the emulsion composition, suppressing the squeaky feeling upon application, and enhancing the feeling of skin protection.

[0013] (Component (B)) Component (B) is a higher alcohol having 10 to 22 carbon atoms. The number of carbon atoms in component (B) is preferably 14 or more, more preferably 16 or more, and is preferably 20 or less, even more preferably 18 or less, from the viewpoints of suppressing precipitation of component (C) described below and imparting a favorable feeling when used.

[0014] In this embodiment, component (B) can be used alone or in combination of two or more. Specific examples of component (B) include monohydric alcohols such as myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, and oleyl alcohol. Among these, those having a linear alkyl group are preferred, more preferably monohydric alcohols having 16 to 18 carbon atoms, and even more preferably one or more selected from cetyl alcohol and stearyl alcohol.

[0015] In the present embodiment, the content of component (B) in the emulsion composition is preferably 0.05 to 15% by mass, more preferably 0.2 to 10% by mass, even more preferably 0.2 to 7% by mass, even more preferably 0.2 to 4% by mass, still more preferably 0.3 to 2% by mass, still more preferably 0.3 to 1.0% by mass, and even more preferably 0.4 to 0.8% by mass, relative to the total emulsion composition, from the viewpoints of improving the emulsion stability of the emulsion composition, suppressing stickiness upon application, and enhancing the sense of thickness and skin protection upon application.

[0016] Furthermore, in the emulsion composition of this embodiment, the total content of components (A) and (B), i.e., the mass proportion represented by ((A) + (B)), is preferably 0.15 to 10 mass%, more preferably 0.4 to 8 mass%, even more preferably 0.6 to 3 mass%, still more preferably 0.7 to 2.5 mass%, and particularly preferably 0.8 to 2.0 mass%, based on the total mass of the emulsion composition, from the viewpoint of improving the emulsion stability of the emulsion composition.

[0017] Furthermore, the mass ratio of component (A) to component (B) ((A) / (B)) is preferably 0.1 or more, more preferably 0.4 or more, and even more preferably 0.6 or more, from the viewpoint of improving the feeling of thickness and skin protection when the emulsion composition is applied; and from the viewpoint of improving the feeling of skin protection and reducing the squeaky feeling when applied, it is preferably 5 or less, more preferably 3.0 or less, and even more preferably 2.5 or less.

[0018] (Component (C)) Component (C) is a ceramide, and one or more types selected from natural ceramides and pseudo-ceramides can be used. Specifically, the ceramides described in JP-A-2013-53146 can be used.

[0019] Specific examples of natural ceramides include ceramides Types 1 to 7 in which sphingosine, dihydrosphingosine, phytosphingosine, or sphingadienine is amidated (e.g., porcine and human ceramides described in Figure 2 of J. Lipid Res., 24:759 (1983) and Figure 4 of J. Lipid. Res., 35:2069 (1994)).

[0020] Furthermore, N-alkyl forms (for example, N-methyl forms) of these are also included. These ceramides may be used in the form of an optically active natural form (D(-) form), an optically active non-natural form (L(+) form), or a mixture of the natural and non-natural forms. The relative configuration of the above compounds may be that of the natural form, or may be any other non-natural form, or may be a mixture of these. Among these, compounds CERAMIDE 1, CERAMIDE 2, CERAMIDE 3, CERAMIDE 5, and CERAMIDE 6II (all from INCI, 8th Edition) and those represented by the following formula are preferred.

[0021] [ka]

[0022] These may be either natural extracts or synthetic products, and commercially available products can be used. Commercially available natural ceramides include Ceramide I, Ceramide III, Ceramide IIIA, Ceramide IIIB, Ceramide IIIC, and Ceramide VI (all manufactured by Cosmopharm Co., Ltd.), Ceramide TIC-001 (manufactured by Takasago International Corporation), CERAMIDE II (manufactured by Quest International), DS-Ceramide VI, DS-CLA-Phytoceramide, Phytoceramide, DS-ceramide Y3S (manufactured by DOOSAN Co., Ltd.), and CERAMIDE 2 (manufactured by SEDERMA Co., Ltd.).

[0023] [ka]

[0024] Furthermore, examples of pseudo-ceramides include those represented by the following general formula (5).

[0025] [ka]

[0026] (In the above general formula (5), R 25 represents a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 10 to 22 carbon atoms which may be substituted with a hydroxyl group, or a hydrogen atom; X 19 represents a hydrogen atom, an acetyl group, or a glyceryl group; R 26 represents a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 5 to 22 carbon atoms which may be substituted with a hydroxyl group or an amino group, or a hydrocarbon group having a linear or branched, saturated or unsaturated fatty acid having 8 to 22 carbon atoms which may be substituted with a hydroxyl group ester-bonded to the ω-terminus of the hydrocarbon group; R 27 represents a hydrogen atom or an alkyl group having a total of 1 to 30 carbon atoms which may be substituted with a hydroxyl group, a hydroxyalkoxy group, an alkoxy group, or an acetoxy group.

[0027] R 26 Particularly preferred are a nonyl group, a tridecyl group, a pentadecyl group, an undecyl group having linoleic acid ester-bonded at the ω-position, a pentadecyl group having linoleic acid ester-bonded at the ω-position, a pentadecyl group having 12-hydroxystearic acid ester-bonded at the ω-position, and an undecyl group having methyl-branched isostearic acid amide-bonded at the ω-position.

[0028] R 25 If is a hydrogen atom, R 27 is an alkyl group having a total of 10 to 30 carbon atoms, preferably 12 to 20 carbon atoms, which may be substituted with a hydroxyl group, a hydroxyalkoxy group, an alkoxy group, or an acetoxy group; R 25 is a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 10 to 22 carbon atoms which may be substituted with a hydroxyl group, R 27 R preferably represents a hydrogen atom or an alkyl group having a total of 1 to 8 carbon atoms which may be substituted with a hydroxyl group, a hydroxyalkoxy group, an alkoxy group, or an acetoxy group. 27 The hydroxyalkoxy group or alkoxy group preferably has 1 to 7 carbon atoms. Specific examples of the compound represented by the general formula (5) include those represented by the following formula:

[0029] [ka]

[0030] As the group represented by general formula (5), R 25 is a hexadecyl group, X 19 is a hydrogen atom, R 26 is a pentadecyl group, R 27 is a hydroxyethyl group; R 25 is a hexadecyl group, X 19 is a hydrogen atom, R 26 is a nonyl group, R 27 Pseudo-type ceramides in which R is a hydroxyethyl group are preferred, and R 25 is a hexadecyl group, X19 is a hydrogen atom, R 26 is a pentadecyl group, R 27 More preferred is one in which the alkyl group is a hydroxyethyl group (N-(hexadecyloxyhydroxypropyl)-N-hydroxyethylhexadecanamide). Also preferred is one represented by the following formula:

[0031] [ka]

[0032] In this embodiment, the content of component (C) in the emulsion composition is preferably 0.05 to 15% by mass, more preferably 0.1 to 13% by mass, even more preferably 0.5 to 10% by mass, and even more preferably 0.8 to 5% by mass, based on the total emulsion composition, from the viewpoint of improving the stability of the emulsion composition and reducing stickiness upon application.

[0033] Furthermore, in components (A), (B), and (C), the mass ratio of component (C) to the total of components (A), (B), and (C), i.e., the mass ratio expressed as ((C) / ((A)+(B)+(C))), is preferably 0.4 or more, more preferably 0.45 or more, even more preferably 0.5 or more, still more preferably 0.52 or more, and especially preferably 0.55 or more, from the viewpoint of improving the emulsion stability and usability of the emulsion composition at low temperatures. Furthermore, from the viewpoint of suppressing precipitation of component (C) during low-temperature storage, the mass ratio expressed as ((C) / ((A)+(B)+(C))) is preferably less than 1.0, more preferably 0.95 or less, more preferably 0.9 or less, even more preferably 0.85 or less, and even more preferably 0.8 or less.

[0034] Furthermore, from the viewpoint of improving the emulsion stability and usability of the emulsion composition at low temperatures, and from the viewpoint of suppressing precipitation of component (C) during low-temperature storage, the mass ratio represented by ((C) / ((A)+(B)) is preferably from 0.5 to 3.5, more preferably from 0.7 to 3.0, and even more preferably from 1.0 to 2.8.

[0035] (Component (D)) Component (D) is at least one selected from sphingosine and its salts, and ionic surfactants. Among the components (D), the sphingosine in sphingosine and salts thereof includes sphingosine represented by the following general formula (1).

[0036] [ka]

[0037] (In the above general formula (1), R 1 represents a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 4 to 30 carbon atoms, which may be substituted with a hydroxyl group, a carbonyl group or an amino group; Y represents a methylene group, a methine group or an oxygen atom; X 1 , X 2 , and X 3 each independently represents a hydrogen atom, a hydroxyl group, or an acetoxy group; X 4 represents a hydrogen atom, an acetyl group, or a glyceryl group, or forms an oxo group together with the adjacent oxygen atom (provided that when Y is a methine group, X 1 and X 2 One of the X's is a hydrogen atom, and the other is absent. 4 When forms an oxo group, X 3 does not exist. );R 2 and R 3 each independently represents a hydrogen atom, a hydroxyl group, a hydroxymethyl group, or an acetoxymethyl group; a number of R's each independently represents a hydrogen atom, an amidino group, or a linear or branched, saturated or unsaturated hydrocarbon group having a total of 1 to 8 carbon atoms which may have a substituent selected from a hydroxyl group, a hydroxyalkoxy group, an alkoxy group, and an acetoxy group; a represents the number 2 or 3; and the dashed line indicates that the bond may be unsaturated.

[0038] In the formula, R 1is a linear, branched, or cyclic, saturated or unsaturated hydrocarbon group having 4 to 30 carbon atoms, preferably 7 to 22 carbon atoms, which may be substituted with a hydroxyl group, carbonyl group, or amino group. Among these, a linear or branched alkyl group having 10 to 20 carbon atoms, or a linear or branched alkyl group having 10 to 20 carbon atoms and having a hydroxyl group at the Y-side terminal, and in the case of a branched alkyl group, one in which the branched chain is methyl-branched, is preferred. Specifically, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a 1-hydroxytridecyl group, a 1-hydroxypentadecyl group, an isohexadecyl group, or an isostearyl group is preferred.

[0039] Y represents either a methylene group (CH2), a methine group (CH), or an oxygen atom. X 1 , X 2 , and X 3 each independently represents a hydrogen atom, a hydroxyl group, or an acetoxy group; X 4 represents a hydrogen atom, an acetyl group, a glyceryl group, or a substituent that forms an oxo group together with the adjacent oxygen atom. 1 , X 2 , and X 3 Of these, 0 to 1 are hydroxyl groups, the rest are hydrogen atoms, and X 4 is preferably a hydrogen atom. When Y is a methine group, X 1 and X 2 Only one of the two is a hydrogen atom, and the other is not present. 4 When forms an oxo group, X 3 does not exist.

[0040] R 2 and R 3 each independently represents a hydrogen atom, a hydroxyl group, a hydroxymethyl group, or an acetoxymethyl group; R 3 is more preferably a hydrogen atom.

[0041] Also, a indicates the number 2 or 3, and when a is 2, R is R 4 and R 5When a is 3, R is R 4 , R 5 and R 6 Shows.

[0042] R 4 , R 5 and R 6 are each independently a hydrogen atom or an amidino group, or a straight-chain or branched, saturated or unsaturated hydrocarbon group having a total of 1 to 8 carbon atoms, which may have a substituent selected from a hydroxyl group, a hydroxyalkoxy group, an alkoxy group, and an acetoxy group. Here, the hydroxyalkoxy group that may substitute for the hydrocarbon group is preferably a straight-chain or branched hydroxyalkoxy group having 1 to 7 carbon atoms. Furthermore, the alkoxy group is preferably a straight-chain or branched alkoxy group having 1 to 7 carbon atoms. R 4 , R 5 and R 6 Examples of the group include a hydrogen atom; a straight-chain or branched-chain alkyl group such as methyl, ethyl, propyl, 2-ethylhexyl, isopropyl, etc.; an alkenyl group such as vinyl or allyl, an amidino group, and a hydrocarbon group having a total of 1 to 8 carbon atoms substituted with 1 to 6 groups selected from hydroxyl groups, hydroxyalkoxy groups, and alkoxy groups, such as hydroxymethyl, 2-hydroxyethyl, 1,1-dimethyl-2-hydroxyethyl, 2-hydroxypropyl, 2,3-dihydroxypropyl, 2-hydroxy-3-methoxypropyl, 2,3,4,5,6-pentahydroxyhexyl, 1,1-bis(hydroxymethyl)ethyl, 2-(2-hydroxyethoxy)ethyl, 2-methoxyethyl, 1-methyl-2-hydroxyethyl, 3-hydroxypropyl, 3-methoxypropyl, 1,1-bis(hydroxymethyl)-2-hydroxyethyl, etc.

[0043] Among these, a hydrogen atom or an alkyl group optionally substituted with 1 to 3 hydroxyl groups and hydroxyalkoxy groups such as a methyl group, 2-hydroxyethyl, 1,1-dimethyl-2-hydroxyethyl, 1,1-bis(hydroxymethyl)ethyl, or 2-(2-hydroxyethoxy)ethyl is preferred.

[0044] The sphingosine represented by general formula (1) is preferably a naturally occurring sphingosine represented by the following general formula (2) or a synthetic product having the same structure.

[0045] [ka]

[0046] (In the above general formula (2), R 7 represents a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 7 to 19 carbon atoms which may be substituted with a hydroxyl group; Y1 represents a methylene group or a methine group; X 5 , X 6 and X 7 each independently represents a hydrogen atom, a hydroxyl group, or an acetoxy group; X 8 represents a hydrogen atom or forms an oxo group together with the adjacent oxygen atom (provided that when Y1 is a methine group, X 5 and X 6 One of the X's represents a hydrogen atom, and the other is absent. 8 When forms an oxo group, X 7 does not exist. );R 8 represents a hydroxymethyl group or an acetoxymethyl group; a number of R1's each independently represent a hydrogen atom or an amidino group, or a linear or branched saturated or unsaturated hydrocarbon group having a total of 1 to 4 carbon atoms which may have a substituent selected from a hydroxyl group, a hydroxyalkoxy group, an alkoxy group, and an acetoxy group; a represents the number 2 or 3; and the dashed line indicates that an unsaturated bond may be present.

[0047] where R 7 is preferably a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 7 to 19 carbon atoms, and particularly preferably a linear saturated or unsaturated hydrocarbon group having 13 to 15 carbon atoms. a is preferably 2, and each R1 is preferably independently a hydrogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms.

[0048] Specific examples of natural sphingosines represented by general formula (2) include natural sphingosine, dihydrosphingosine, phytosphingosine, sphingadienine, dehydrosphingosine, dehydrophytosphingosine, and N-alkylated forms thereof (for example, N-methylated forms). These sphingosines may be used in the optically active form of the natural form (D(+) form), the optically active form of the non-natural form (L(-) form), or a mixture of the natural and non-natural forms. The relative configuration of the above compounds may be that of the natural form, any other non-natural form, or a mixture of these. Among these, phytosphingosine (INCI name; 8th Edition) and compounds represented by the following formula are preferred.

[0049] [ka]

[0050] These may be either natural extracts or synthetic products, and commercially available products can be used. Commercially available natural sphingosines include, for example, D-sphingosine (4-sphingosine) (manufactured by SIGMA-ALDRICH), DS-phytosphingosine (manufactured by DOOSAN), and phytosphingosine (manufactured by Cosmopharm).

[0051] These sphingosine salts include acidic amino acid salts such as glutamic acid and aspartic acid; basic amino acid salts such as arginine; inorganic acid salts such as phosphoric acid and hydrochloric acid; monocarboxylic acid salts such as acetic acid; dicarboxylic acid salts such as succinic acid; and oxycarboxylic acid salts such as citric acid, lactic acid, and malic acid. One or more selected from these are preferred.

[0052] Next, among the component (D), examples of the ionic surfactant include anionic surfactants, cationic surfactants, and amphoteric surfactants. Examples of anionic surfactants include fatty acids having 12 to 22 carbon atoms or salts thereof, such as sodium laurate, potassium palmitate, and arginine stearate; alkyl sulfates having 12 to 22 carbon atoms or salts thereof, such as sodium lauryl sulfate, potassium lauryl sulfate, and sodium cetyl sulfate; C12-22 alkyl ether sulfates or salts thereof, such as polyoxyethylene lauryl sulfate triethanolamine; C12-C22 alkyl ether acetates or salts thereof, such as sodium polyoxyethylene tridecyl ether acetate; N-C12 to N-C22 acyl sarcosine or a salt thereof, such as sodium lauroyl sarcosine; alkyl phosphates having 12 to 22 carbon atoms or salts thereof, such as sodium monostearyl phosphate; polyoxyethylene alkyl ether phosphates having 12 to 22 carbon atoms, such as sodium polyoxyethylene oleyl ether phosphate and sodium polyoxyethylene stearyl ether phosphate, or salts thereof; dialkyl sulfosuccinates having 12 to 24 carbon atoms or salts thereof, such as sodium di-2-ethylhexyl sulfosuccinate; N-Alkylmethyltaurine having 12 to 22 carbon atoms or a salt thereof, such as sodium N-stearoyl-N-methyltaurine; and Acylglycines having 12 to 22 carbon atoms, such as sodium N-coconut oil fatty acid acylglycine, or salts thereof; Acyl alanine having 12 to 22 carbon atoms, such as sodium N-coconut oil fatty acid acylalanine, or a salt thereof; or Examples thereof include N-acyl glutamic acids having 12 to 22 carbon atoms or salts thereof, such as sodium dilauroyl glutamate, monosodium N-lauroyl glutamate, sodium N-stearoyl-L-glutamate, arginine N-stearoyl glutamate, sodium N-stearoyl glutamate, and sodium N-myristoyl-L-glutamate, as well as acylaspartates, lysine diacyl glutamate salts, acyl arginine salts, dialkyldimethylammonium salts, and alkyltrimethylammonium salts.

[0053] Furthermore, examples of cationic surfactants include quaternary ammonium salts and amine salts. From the viewpoint of improving the emulsion stability of the emulsion composition, quaternary ammonium salts are preferred, and examples thereof include alkyltrimethylammonium salts such as stearyltrimethylammonium chloride and behenyltrimethylammonium chloride, dialkyldimethylammonium salts, and trialkylmethylammonium salts.

[0054] Furthermore, examples of amphoteric surfactants include alkyldimethylamine oxide, alkylcarboxybetaine, alkylsulfobetaine, amide amino acid salts, and alkylamidopropylbetaine, with alkylamidopropylbetaine being preferred among them.

[0055] From the viewpoint of improving the emulsion stability of the emulsion composition, component (D) is preferably one or more selected from sphingosine and salts thereof, and anionic surfactants. Furthermore, from the viewpoint of improving the emulsion stability of the emulsion composition, the anionic surfactant is preferably one other than a fatty acid or a salt thereof, and is preferably one or more selected from polyoxyethylene alkyl ether phosphates or salts thereof having 12 to 22 carbon atoms, N-alkyloylmethyl taurines having 12 to 22 carbon atoms, and N-acyl glutamates having 12 to 22 carbon atoms. From the viewpoint of obtaining a preferable feeling in use, one or two selected from the group consisting of N-acyl glutamic acids or salts thereof having 12 to 22 carbon atoms, and N-alkyloylmethyl taurines having 12 to 22 carbon atoms are more preferred. As the N-acyl glutamate having 12 to 22 carbon atoms, from the viewpoint of improving the emulsion stability of the emulsion composition and obtaining a preferable feeling in use, N-stearoyl-L-glutamate is preferred, and N-stearoyl-L-glutamic acid arginine salt and N-stearoyl-L-glutamic acid potassium salt are more preferred. As the N-alkyloylmethyl taurine salt having 12 to 22 carbon atoms, from the viewpoint of improving the emulsion stability of the emulsion composition and obtaining a favorable feeling in use, an N-alkyloylmethyl taurine salt having 12 to 22 carbon atoms is preferred, an N-alkyloylmethyl taurine salt having 14 to 20 carbon atoms is more preferred, and an N-alkyloylmethyl taurine salt having 16 to 20 carbon atoms is even more preferred.

[0056] Furthermore, from the viewpoint of suppressing precipitation of component (C) and improving the emulsion stability of the emulsion composition, it is preferable that component (D) contains one or more selected from the group consisting of phytosphingosine or its salt, pseudosphingosine salt, acyl glutamate, acylaspartate, acyl methyl taurine salt, fatty acid salt, diacyl glutamic acid lysine salt, acyl arginine salt, dialkyl dimethyl ammonium salt, and alkyl trimethyl ammonium salt. Phytosphingosine or its salt and acyl methyl taurine salt are more preferable, and from the viewpoint of a favorable feel in use, particularly good spreadability, acyl methyl taurine salt is even more preferable.

[0057] The component (D) can be used alone or in combination of two or more. The content of component (D) indicates the content of the compound excluding counter ions, and from the viewpoints of stably dispersing each component described below, achieving a non-sticky feel when used, and suppressing a squeaky feeling when applied, it is, for example, 0.01 to 10 mass%, preferably 0.05 to 5 mass%, more preferably 0.1 to 3 mass%, even more preferably 0.1 to 2 mass%, and particularly preferably 0.3 to 1 mass%, based on the total weight of the emulsion composition.

[0058] In components (A), (B), (C), and (D), the mass ratio of component (D) to the total of components (A), (B), and (C), i.e., the mass ratio expressed as ((D) / ((A)+(B)+(C))), is preferably greater than 0, more preferably at least 0.03, even more preferably at least 0.08, and even more preferably at least 0.10, from the viewpoints of improving the emulsion stability of the emulsion composition at low temperatures, suppressing precipitation of component (C) during low-temperature storage, and improving the feel when used. Furthermore, from the viewpoint of improving the balance between the emulsion stability and feel when used of the emulsion composition at low temperatures, the mass ratio expressed as ((D) / ((A)+(B)+(C))) is preferably 0.5 or less, more preferably 0.4 or less, even more preferably 0.35 or less, even more preferably 0.30 or less, still more preferably 0.2 or less, and especially preferably 0.15 or less.

[0059] Furthermore, in the emulsion composition of this embodiment, the total content of components (A) to (D), i.e., the mass proportion represented by ((A)+(B)+(C)+(D)), is preferably 0.3 to 15 mass%, more preferably 0.5 to 12 mass%, even more preferably 1 to 10 mass%, still more preferably 2 to 8 mass%, particularly preferably 3.5 to 7 mass%, and especially preferably 3.5 to 5 mass%, based on the total mass of the emulsion composition, from the viewpoint of improving the stability of the emulsion composition at low temperatures.

[0060] The emulsion composition in this embodiment is a W / O type emulsion composition containing the above components (A) to (D). From the viewpoint of improving the emulsion stability of the emulsion composition and obtaining a favorable feel when used, it is preferable that the components (A) to (D) are contained in the aqueous phase of the W / O type emulsion composition, and it is more preferable that the emulsion composition is an O1 / W / O type emulsion composition in which an inner oil phase O1 is dispersed in the aqueous phase of the W / O type emulsion composition. Furthermore, the inner oil phase of the emulsion composition of this embodiment, more specifically, has a lamellar α-gel structure. The emulsion composition of this embodiment has an excellent feel when used, particularly a long-lasting moist feeling, which is presumably because the solid fat in the emulsion composition forms a lamellar coating with an α-gel structure on the skin surface, and the oil remains on the skin surface as a lamellar coating for a long period of time due to a synergistic effect with the outer oil phase. Therefore, in this embodiment, from the viewpoint of obtaining a cosmetic product that inhibits crystallization of ceramides during low-temperature storage, stably incorporates ceramides, and provides a pleasant feel when used, it is preferable to contain components (A) to (D) in the inner oil phase (O1).

[0061] (Component (E)) Component (E) is a nonionic surfactant containing the following (e1) and (e2): (e1) One or more selected from crosslinked polyether-modified silicones and crosslinked polyglycerin-modified silicones (e2) One or more selected from polyether-modified silicone, polyglycerin-modified silicone, and polyglycerin fatty acid ester. By using these (e1) and (e2) in combination, the storage stability under temperature cycle conditions is improved, and the cosmetic composition also has an excellent feel (richness) when used.

[0062] (e1) Crosslinked polyether-modified silicone is a three-dimensional crosslinked product in which organopolysiloxane chains are crosslinked with polyether, and is, for example, represented by the following general formula (3):

[0063] [ka]

[0064] (In the formula, each R 10 represents a methyl group or a phenyl group, each R' represents a hydrogen atom, an alkyl group or an acyl group having 1 to 30 carbon atoms, each R" represents an alkyl group or an acyl group having 1 to 30 carbon atoms, or a siloxane group having 1 to 30 silicon atoms, d represents a number from 1 to 20, e and f represent a number from 0 to 200, and e and f cannot be 0 at the same time, g represents a number from 0 to 30, h represents a number from 1 to 100, i represents a number from 10 to 2000, j represents a number from 1 to 1000, and k represents a number from 1 to 1000. Examples of the crosslinked polyether-modified silicone include those represented by the following formula:

[0065] In general formula (1), R" is preferably an alkyl group having 1 to 15 carbon atoms. Furthermore, it is preferable that g is a number of 0 to 15, h is a number of 1 to 40, i is a number of 10 to 200, j is a number of 1 to 50, and k is a number of 1 to 50.

[0066] (e1) Crosslinked polyether-modified silicone can be produced, for example, by the method described in JP-A-4-272932. Furthermore, (e1) crosslinked polyether-modified silicone is preferably diluted or dispersed in a volatile hydrocarbon oil or silicone oil, with isododecane and polyisobutene being more preferred as the volatile hydrocarbon oil.

[0067] (e1) Examples of crosslinked polyether-modified silicones that can be used include commercially available products such as KSG-210, KSG-240 (dimethicone / (PEG-10 / 15)) crosspolymer; KSG-310, KSG-320, KSG-330 ((PEG-15 / lauryl dimethicone) crosspolymer); and KSG-340 ((PEG-10 / lauryl dimethicone) crosspolymer and (PEG-15 / lauryl dimethicone) crosspolymer) (all manufactured by Shin-Etsu Chemical Co., Ltd.). These crosslinked polyether-modified silicones can be used alone or in combination of two or more.

[0068] (e1) Crosslinked polyglycerin-modified silicone is a three-dimensional crosslinked product in which organopolysiloxane chains are crosslinked with polyglycerin. Specific examples include (dimethicone / polyglycerin-3) crosspolymer and alkyl-co-modified (lauryl dimethicone / polyglycerin-3) crosspolymer. For example, commercially available products such as KSG-710 (dimethicone / polyglycerin-3) crosspolymer and KSG-810 (lauryl dimethicone / polyglycerin-3) crosspolymer (both manufactured by Shin-Etsu Chemical Co., Ltd.) can be used. These crosslinked polyglycerin-modified silicones can be used alone or in combination of two or more.

[0069] From the viewpoints of storage stability under temperature cycle conditions and usability, the content of component (e1) is preferably from 0.1% by mass to 10% by mass, more preferably from 0.2% by mass to 5% by mass, and even more preferably from 0.5% by mass to 2% by mass, based on the total emulsion composition. From the viewpoints of storage stability under temperature cycle conditions and usability, it is more preferable to use a crosslinked polyether-modified silicone as component (e1).

[0070] Of the components (e2), the polyether-modified silicone refers to a silicone having a monovalent polyoxyalkyl group in its structure, and examples thereof include those represented by the following general formula (4).

[0071] [ka]

[0072] (In the above general formula (4), each R 11 are the same or different and represent a methyl group or a phenyl group; R 13 represents a hydrogen atom, an alkyl group or an acyl group having 1 to 30 carbon atoms, and R 12represents an alkyl or acyl group having 1 to 30 carbon atoms, or a siloxane group having 1 to 30 silicon atoms, d represents a number from 1 to 20, e and f represent a number from 0 to 200, and e and f cannot simultaneously be 0. g represents a number from 10 to 2000, and h represents a number from 1 to 1000. Preferably, in the general formula (4), d is a number from 1 to 10, e is a number from 1 to 50, f is a number from 1 to 50, g is a number from 10 to 1000, and h is a number from 1 to 50.

[0073] Examples of polyether-modified silicones of component (e2) include PEG-3 dimethicone, PEG-10 dimethicone, PEG-12 dimethicone, PEG-11 methyl ether dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, cetyl PEG / PPG-10 / 1 dimethicone, etc. Commercially available products include KF-6011, KF-6015, KF-6017, KF-6025, KF-6028, and KF-6048 (all manufactured by Shin-Etsu Chemical Co., Ltd.). Of the components (e2), the polyglycerin-modified silicone refers to a silicone having a monovalent polyglyceryl group in its structure, such as polyglyceryl-3 disiloxane dimethicone, polyglyceryl-3 polydimethylsiloxyethyl dimethicone, etc. Commercially available products include KF-6100 and KF-6104 (both manufactured by Shin-Etsu Chemical Co., Ltd.). These components (e2) can be used alone or in combination of two or more.

[0074] Among the component (e2), examples of the polyglycerol fatty acid ester include diglycerol fatty acid esters and triglycerol fatty acid esters, and from the viewpoint of improving the storage stability of the emulsion composition under temperature cycle conditions, diglycerol fatty acid esters are preferred. From the same viewpoint, the polyglycerol fatty acid ester is preferably derived from a fatty acid having 12 to 22 carbon atoms, more preferably 14 to 20 carbon atoms, and more preferably is derived from a saturated fatty acid. From the viewpoints of storage stability under temperature cycle conditions and usability, it is more preferable to use polyether-modified silicone and / or polyglycerin fatty acid ester as component (e2). These components (e2) can be used alone or in combination of two or more.

[0075] From the viewpoints of storage stability under temperature cycle conditions and usability, the content of component (e2) is preferably from 0.1% by mass to 10% by mass, more preferably from 1% by mass to 7% by mass, even more preferably from 1.5% by mass to 5% by mass, and even more preferably from 1.5% by mass to 4% by mass, based on the total weight of the emulsion composition.

[0076] In the present invention, both component (e1) and component (e2) are used in combination as the nonionic surfactant (E). From the viewpoints of storage stability under temperature cycle conditions and the feel when used, the mass ratio of component (e1) to component (e2) (e2 / e1) is preferably 0.1 or more and 10 or less, more preferably 0.1 or more and 8 or less, more preferably 1 or more and 7 or less, and even more preferably 3 or more and 5 or less.

[0077] The surface of the skin is maintained at a weakly acidic pH as part of homeostasis. Therefore, when designing a mild topical skin preparation, it is desirable to adjust the pH of the preparation to a weakly acidic pH similar to that of the skin. Furthermore, it is more desirable to use an anionic surfactant as the ionic surfactant in the topical skin preparation, considering its applicability to users of a wide range of ages and skin types. However, when an anionic surfactant is used to stably emulsify and disperse ceramides, its surface activity is weakened at a weakly acidic pH, resulting in problems with emulsion stability during high-temperature storage. Therefore, the W / O emulsion composition of the present invention contains an anionic surfactant as component (D), and further contains (F) a nonionic surfactant other than (e1) and (e2) having an HLB of 8 or more, and (G) one or more selected from inorganic acids and organic acids having 6 or fewer carbon atoms. This composition exhibits little change in viscosity even after storage at high temperatures of 50°C or higher, has excellent emulsion stability, and provides a sustained moist feeling, as well as an excellent feel when applied, such as a thick feel when applied, a moisturizing feel on the skin, no squeaking feeling when applied, and leaves the skin feeling smooth.

[0078] The anionic surfactant (D) used in this embodiment is preferably the same anionic surfactant as described above. That is, examples of the anionic surfactant of component (D) in this embodiment include fatty acids having 12 to 22 carbon atoms or salts thereof, such as sodium laurate, potassium palmitate, and arginine stearate; C12-C22 alkyl sulfates or salts thereof, such as sodium lauryl sulfate, potassium lauryl sulfate, and sodium cetyl sulfate; C12-22 alkyl ether sulfates or salts thereof, such as polyoxyethylene lauryl sulfate triethanolamine; C12-C22 alkyl ether acetates or salts thereof, such as sodium polyoxyethylene tridecyl ether acetate; N-C12 to N-C22 acyl sarcosine or a salt thereof, such as sodium lauroyl sarcosine; alkyl phosphates having 12 to 22 carbon atoms or salts thereof, such as sodium monostearyl phosphate; C12-C22 alkyl ether phosphates or salts thereof, such as sodium polyoxyethylene oleyl ether phosphate and sodium polyoxyethylene stearyl ether phosphate; dialkyl sulfosuccinates having 12 to 24 carbon atoms or salts thereof, such as sodium di-2-ethylhexyl sulfosuccinate; N-Alkylmethyltaurines having 12 to 22 carbon atoms or salts thereof, such as sodium N-stearoyl-N-methyltaurine; Acylglycines having 12 to 22 carbon atoms, such as sodium N-coconut oil fatty acid acylglycine, or salts thereof; Acyl alanine having 12 to 22 carbon atoms, such as sodium N-coconut oil fatty acid acylalanine, or a salt thereof; or Examples thereof include N-acyl glutamic acids having 12 to 22 carbon atoms or salts thereof, such as sodium dilauroyl glutamate, monosodium N-lauroyl glutamate, sodium N-stearoyl-L-glutamate, arginine N-stearoyl-L-glutamate, sodium N-stearoyl glutamate, and sodium N-myristoyl-L-glutamate. From the viewpoint of improving the emulsion stability of the emulsion composition, component (D) is preferably a fatty acid or a salt thereof, and is preferably one or more selected from polyoxyethylene alkyl ether phosphates or salts thereof having 12 to 22 carbon atoms, N-alkyloylmethyl taurines having 12 to 22 carbon atoms, and N-acyl glutamates having 12 to 22 carbon atoms. From the viewpoint of obtaining a preferable feel in use, one or two selected from the group consisting of N-acyl glutamic acids or salts thereof having 12 to 22 carbon atoms, and N-alkyloylmethyl taurines having 12 to 22 carbon atoms are more preferred. As the N-acyl glutamate having 12 to 22 carbon atoms, from the viewpoint of improving the emulsion stability of the emulsion composition and obtaining a preferable feel in use, N-stearoyl-L-glutamate is preferred, and N-stearoyl-L-glutamic acid arginine salt and N-stearoyl-L-glutamic acid potassium salt are more preferred. As the N-alkyloylmethyl taurine salt having 12 to 22 carbon atoms, from the viewpoint of improving the emulsion stability of the emulsion composition and obtaining a favorable feeling in use, an N-alkyloylmethyl taurine salt having 12 to 22 carbon atoms is preferred, an N-alkyloylmethyl taurine salt having 14 to 20 carbon atoms is more preferred, and an N-alkyloylmethyl taurine salt having 16 to 20 carbon atoms is even more preferred.

[0079] Furthermore, from the viewpoint of suppressing precipitation of component (C) and improving the emulsion stability of the emulsion composition, it is preferable that component (D) contains one or more selected from the group consisting of acylmethyltaurine salts, acylglutamates, acylaspartates, fatty acid salts, diacylglutamic acid lysine salts, and acylarginine salts.

[0080] In this embodiment, the component (D) can be used either alone or in combination of two or more. The content of component (D) is, for example, 0.01 to 10 mass %, preferably 0.05 to 5 mass %, more preferably 0.1 to 3 mass %, even more preferably 0.3 to 2 mass %, and particularly preferably 0.4 to 1 mass %, of the total emulsion composition, from the viewpoints of stably dispersing the components described below, achieving a non-sticky feel when used, and suppressing any squeaky feeling upon application.

[0081] In this embodiment, with respect to components (A), (B), (C), and (D), the mass ratio of component (D) to the total of components (A), (B), and (C), i.e., the mass ratio expressed as ((D) / ((A)+(B)+(C))), is preferably greater than 0, more preferably at least 0.03, even more preferably at least 0.08, and even more preferably at least 0.10, from the viewpoints of improving the emulsion stability of the emulsion composition at low temperatures, suppressing precipitation of component (C) during low-temperature storage, and improving the feel when used. Furthermore, from the viewpoint of improving the balance between the emulsion stability and feel when used of the emulsion composition at low temperatures, the mass ratio expressed as ((D) / ((A)+(B)+(C))) is preferably 0.5 or less, more preferably 0.4 or less, even more preferably 0.35 or less, even more preferably 0.30 or less, and especially preferably 0.2 or less.

[0082] Furthermore, in the emulsion composition of this embodiment, the total content of components (A) to (D), i.e., the mass proportion represented by ((A)+(B)+(C)+(D)), is preferably 0.3 to 15 mass%, more preferably 0.5 to 12 mass%, even more preferably 1 to 10 mass%, still more preferably 2 to 8 mass%, particularly preferably 3.0 to 7 mass%, and especially preferably 3.5 to 5 mass%, based on the total mass of the emulsion composition, from the viewpoint of improving the stability of the emulsion composition at low temperatures.

[0083] Furthermore, the component (E) and its content in this embodiment are the same as those described above.

[0084] (Component (F)) Component (F) is a nonionic surfactant other than (e1) and (e2) above, having an HLB of 8 or higher. In this embodiment, the use of a nonionic surfactant with an HLB of 8 or higher improves the emulsion stability of a composition containing an acidic compound in its aqueous phase under high-temperature conditions, and prevents the feeling of use from being impaired by separation, thickening, or gelation. From the viewpoint of improving high-temperature emulsion stability and high-temperature viscosity stability and obtaining a favorable feeling in use, the HLB of the nonionic surfactant is preferably 8 or more and 20 or less, more preferably 10 or more and 20 or less, even more preferably 10.7 or more and 20 or less, still more preferably 13 or more and 20 or less, and especially preferably 14 or more and 20 or less. Here, the HLB (hydrophilic-lipophilic balance) can be determined, for example, by the following formula.

[0085] Formula: [HLB]=7+1.171log(Mw / Mo) (In the formula, Mw represents the molecular weight of the hydrophilic group of the surfactant, Mo represents the molecular weight of the hydrophobic group of the surfactant, and log represents a logarithm to the base 10.)

[0086] The (F) nonionic surfactant with an HLB of 8 or higher is preferably one or more selected from polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene fatty acid ester, polypropylene glycol fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene polyoxypropylene alkyl ether, sucrose fatty acid ester, etc. Of these, from the viewpoints of emulsion stability at high temperatures, viscosity stability at high temperatures, and obtaining a favorable feel when used, one or more selected from polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, and polyoxyethylene fatty acid ester are more preferred.

[0087] In this embodiment, component (F) can be used alone or in combination of two or more. In this embodiment, the content of component (F) is preferably 0.05 to 1 mass %, more preferably 0.1 to 1 mass %, even more preferably 0.15 to 0.8 mass %, and even more preferably 0.2 to 0.7 mass %, of the total emulsion composition, from the viewpoints of emulsion stability at high temperatures, high-temperature viscosity stability, and obtaining a favorable feel when used.

[0088] Component (G) is an inorganic acid or an organic acid having six or fewer carbon atoms. By incorporating an inorganic acid or an organic acid into the aqueous phase, the skin surface is maintained at homeostasis while the feel during use is improved. The organic acid is preferably a water-soluble organic acid, and examples thereof include fatty acids having 1 to 6 carbon atoms, hydroxy acids, dicarboxylic acids, acidic amino acids, etc. Among these, from the viewpoint of obtaining a favorable feeling in use, one or more selected from malic acid, lactic acid, citric acid, succinic acid, acetic acid, tartaric acid, glutamic acid, aspartic acid, and adipic acid are more preferred, one or more selected from malic acid, lactic acid, citric acid, succinic acid, adipic acid, and glutamic acid are even more preferred, and succinic acid is particularly preferred. Furthermore, from the viewpoint of obtaining a favorable feeling when used, the inorganic acid is preferably one or more selected from hydrochloric acid, nitric acid, nitrous acid, sulfuric acid, sulfurous acid, phosphoric acid, phosphonic acid and phosphinic acid, and more preferably phosphoric acid. It is preferable to adjust the pH of the aqueous layer to the acidic side by adding component (G). The pH of the aqueous layer is preferably 3.0 to 7.0, more preferably 4.0 to 6.5.

[0089] In this embodiment, component (G) may be used alone or in combination of two or more. In this embodiment, the content of component (G) is preferably 0.01 to 2% by mass, more preferably 0.02 to 1% by mass, even more preferably 0.05 to 1% by mass, even more preferably 0.05 to 0.8% by mass, even more preferably 0.05 to 0.5% by mass, and especially preferably 0.1 to 0.2% by mass, from the viewpoints of maintaining good high-temperature stability of the emulsion composition, maintaining homeostasis of the skin surface, and improving the feel during use.

[0090] The mass ratio (F / G) of component (F) to component (G) is preferably 0.3 or more and 6.0 or less, more preferably 0.7 or more and 5.5 or less, even more preferably 1.0 or more and 5.0 or less, and even more preferably 1.2 or more and 4.0 or less, from the viewpoints of improving emulsion stability and high-temperature viscosity stability at high temperatures and of obtaining a favorable feel when used, in particular a warm feeling upon application and a smooth feeling on the skin.

[0091] The mass ratio (F / A) of component (F) to component (A) is preferably 0.1 or more and 1.5 or less, more preferably 0.2 or more and 1.3 or less, and even more preferably 0.25 or more and 1.0 or less, from the viewpoints of improving the stability of the emulsion composition at low and high temperatures, improving its high-temperature viscosity stability, and providing a favorable feel when used, particularly a warm feeling upon application and a smooth feeling on the skin.

[0092] The emulsion composition in this embodiment is a W / O type emulsion composition containing the above components (A) to (G). From the viewpoint of improving the stability of the emulsion composition at low and high temperatures, improving the high-temperature viscosity stability, and obtaining a favorable feel when used, it is preferable that the aqueous phase of the W / O type emulsion composition contains components (A) to (D) and (F) and (G), and it is more preferable that the emulsion composition is an O1 / W / O type emulsion cosmetic in which an inner oil phase O1 is dispersed in the aqueous phase of the W / O type emulsion composition. Furthermore, the inner oil phase of the emulsion composition of this embodiment, more specifically, has a lamellar α-gel structure. The topical skin preparation of this embodiment has an excellent feel when used, particularly a long-lasting moist feeling, which is presumably because the solid fat in the emulsion composition forms a lamellar coating with an α-gel structure on the skin surface, and the oil agent remains on the skin surface as a lamellar coating for a long period of time due to a synergistic effect with the outer oil phase. Therefore, in this embodiment, from the viewpoint of obtaining a cosmetic product that inhibits crystallization of ceramides during low-temperature storage, stably incorporates ceramides, and provides a pleasant feel when used, it is preferable to contain components (A) to (D) and (F) in the inner oil phase (O1).

[0093] In addition to the above components, the emulsion composition of the present invention may contain water, an oily component (H) other than component (B), a thickener or gel-like substance, amino acids, plant extracts, moisturizers, anti-inflammatory agents, preservatives, etc. Examples of the oily component (H) include those commonly used in cosmetics, such as hydrocarbon oils such as liquid paraffin, squalane, petrolatum, and ceresin; ether oils such as cetyl dimethyl butyl ether (hereinafter also referred to simply as "cetyl dimethyl butyl"), ethylene glycol dioctyl ether, and glycerol monooleyl ether; ester oils such as octyldodecyl myristate, isopropyl palmitate, butyl stearate, di-2-ethylhexyl adipate, neopentyl glycol dicaprate, trioctanoin, and isotridecyl isononanoate; silicone oils such as dimethylpolysiloxane, cyclic dimethylpolysiloxane, methylphenylpolysiloxane, amino-modified silicone, carboxy-modified silicone, alcohol-modified silicone, alkyl-modified silicone, polyether-modified silicone, and fluorine-modified silicone; and fluorine-based oils such as perfluoroalkylethyl phosphate, perfluoroalkylpolyoxyethylene phosphate, perfluoropolyether, and polytetrafluoroethylene. Ester oils and the like may be derived from natural oils, such as plant oils.

[0094] Among these, from the viewpoint of improving the feel of use without a squeaky sensation, the oil component (H) contained in the outer layer oil phase preferably contains an oil that is liquid at 25°C, and the oil that is liquid at 25°C is preferably a hydrocarbon oil or a silicone oil, and more preferably contains both. From the same viewpoint, the mass ratio of hydrocarbon oil to silicone oil (hydrocarbon oil / silicone oil) is preferably 15 / 1 to 1 / 1, more preferably 8 / 1 to 1.5 / 1, and even more preferably 5 / 1 to 1 / 1. When these oily ingredients are contained, the content thereof is preferably about 10 to 50% by mass based on the total emulsion composition. Furthermore, a polar oil having an IOB value of 0.1 or more can be used as the oil component (H) contained in the outer layer oil phase. From the viewpoint of emulsion stability, the content thereof is preferably 40% by mass or less, more preferably 20% by mass or less, and even more preferably 1% by mass or less, of the entire outer layer oil phase (O), and it is most preferable that the outer layer oil phase does not contain any polar oil having an IOB value of 0.1 or more.

[0095] Examples of amino acids include neutral amino acids such as glycine, serine, cystine, alanine, threonine, cysteine, valine, phenylalanine, methionine, leucine, tyrosine, proline, isoleucine, tryptophan, and hydroxyproline; acidic amino acids such as aspartic acid, asparagine, glutamine, and glutamic acid; basic amino acids such as arginine, histidine, and lysine; and further examples of betaine and amino acid derivatives include acyl sarcosine and its salts, acyl glutamic acid and its salts, acyl-β-alanine and its salts, glutathione, pyrrolidone carboxylic acid and its salts, glutathione, carnosine, oligopeptides such as gramcigin S, tyrocidine A, and tyrocidine B, and the guanidine derivatives and their salts described in JP-A-6-228023.

[0096] When these amino acids are contained, the content thereof is preferably about 0.001 to 3% by mass based on the total emulsion composition.

[0097] Examples of plant extracts include angelica, adzuki bean, avocado, amacha, gynostemma, arteca, arnica, almond, aloe, apricot, nettle, iris, fennel, turmeric, star anise, Scutellaria root, Phellodendron bark, Coptis chinensis, barley, okra, St. John's wort, dead nettle, ononis, watercress, persimmon, pueraria root, valerian, birch, cattail, chamomile, chamomilla recutita, oat, licorice, raspberry, kiwi, cucumber, apricot kernel, kukui nut, Gardenia, Kumazasa, Walnut, Cinnamon Bark, Mulberry, Ultramarine, Gentian, Geranium, Burdock, Sesame, Wheat, Rice, Camellia Sasanqua, Saffron, Hawthorn, Japanese Pepper, Shiitake Mushroom, Rehmannia Root, Lithospermum Root, Perilla Root, Tilia, Meadowsweet, Peony, Ginger, Calamus, Birch, Honeysuckle, Horsetail, Stevia, Ivy, Hawthorn, Elderberry, Juniper, Yarrow, Peppermint, Sage, Mallow, Cnidium, and Satrum Li, soybean, daisie, dium, tea, clove, tangerine, evening primrose, camellia, centella, walnut, angelica, calendula, peach kernel, spruce, corn, lily of the valley, tomato, carrot, garlic, wild rose, barley, parsley, naked barley, Job's tears, peppermint, papaya, hamamelis, rose, cypress, sunflower, loquat, coltsfoot, grape, placenta, hazelnut, loofah, safflower, linden tree, peony, hop, macadamia nut, pine, horse chestnut, Examples include extracts obtained by conventional methods from plants such as melissa, melilot, peach, bean sprout, cornflower, palm, eucalyptus, saxifrage, lily, coix seed, mugwort, rye, peanut, lavender, apple, lychee, lettuce, lemon, astragalus, rosemary, Roman chamomile, agrimony, catalpa, thuja dolabrata, holly-leaf sedge, sycamore, Japanese pheasant's-eye, Chinese laurel, chickweed, duckweed, artemisia capillaris, ginkgo, platycodon, chrysanthemum, bamboo grass, soapberry, and forsythia. Of these, extracts obtained from hamamelis, peony, agrimony, catalpa, thuja dolabrata, eucalyptus, ginger, holly-leaf sedge, sycamore, or sycamore are preferred.

[0098] When these plant extracts are contained, the content thereof is preferably about 0.0001 to 2% by mass in terms of dry solid content relative to the entire emulsion composition.

[0099] Examples of moisturizing agents include polyhydric alcohols having moisturizing properties such as glycol, glycerin, glucose, maltose, maltitol, sucrose, fructose, xylitol, sorbitol, maltotriose, threitol, erythritol, starch hydrolysis sugar reducing alcohol, and sorbitol; ethylene glycol, 1,4-butylene glycol, diglycerin, triglycerin, tetraglycerin, 1,3-butylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol, and 1,3-propanediol. Furthermore, polyoxyethylene methyl glucosides such as methyl gluceth-10 and methyl gluceth-20, and polyoxypropylene methyl glucosides such as PPG-20 methyl glucose ester may also be used.

[0100] When these moisturizing agents are contained, the content thereof is preferably about 0.01 to 30% by mass based on the total weight of the emulsion composition.

[0101] Examples of anti-inflammatory agents include glycyrrhizinic acid and salts thereof, glycyrrhetinic acid and salts thereof, epsilon-aminocaproic acid and salts thereof, allantoin, lysozyme chloride, guaiazulene, methyl salicylate, and γ-oryzanol. Among these, one or more selected from the group consisting of glycyrrhetinic acid, stearyl glycyrrhetinate, and epsilon-aminocaproic acid are more preferred.

[0102] When these anti-inflammatory agents are contained, the content thereof is preferably about 0.001 to 2% by mass based on the total emulsion composition.

[0103] Examples of preservatives include parahydroxybenzoic acid esters (parabens) such as methylparaben, dehydroacetic acid and its salts, and phenoxyethanol. Preservative aids that may be used include sodium benzoate and disodium edetate. Furthermore, thickeners such as distearyldimonium hectorite and dextrin palmitate may be used as other ingredients.

[0104] From the viewpoint of providing a good feeling of protection and smoothness to the skin when applied to the skin, the emulsion composition of the present invention is preferably an O1 / W / O type emulsion composition in which an inner oil phase O1 containing components (A) to (D) or components (A) to (D) and (F) is dispersed in the aqueous phase of a W / O type emulsion composition. The topical skin preparation may contain components other than components (A) to (D) or components (A) to (F), such as known components, in the inner oil phase O1, as long as the effects of the present invention are not impaired. Furthermore, from the viewpoint of suppressing crystallization of ceramides during low-temperature storage and stably incorporating ceramides, the content of solid fats other than components (A) to (D) or components (A) to (F) in the emulsion composition is preferably 1% by mass or less, preferably 0.5% by mass or less, more preferably 0.1% by mass or less, and preferably substantially 0% by mass.

[0105] Furthermore, from the viewpoint of improving the emulsion stability of the emulsion composition, the proportion of the inner layer oil phase O1 in the O1 / W / O type emulsion composition is preferably 0.1 to 15 mass %, more preferably 0.5 to 12 mass %, even more preferably 1 to 10 mass %, still more preferably 2 to 8 mass %, and especially preferably 3.5 to 7 mass %, based on the total mass of the emulsion composition.

[0106] Next, the water phase in the W / O emulsion composition will be described. The proportion of the aqueous phase W in the emulsion composition is the remainder after subtracting the outer layer oil phase O from the emulsion composition (in the case of an O1 / W / O type emulsion composition, the total of the outer layer oil phase O and the inner layer oil phase O1), and from the viewpoint of improving the emulsion stability of the emulsion composition, it is preferably 30 to 90 mass %, more preferably 50 to 85 mass %, of the entire emulsion composition. Specifically, the aqueous phase W mainly contains water. The water content in the emulsion composition is preferably 30 to 90% by mass, more preferably 45 to 85% by mass, based on the total mass of the emulsion composition. The water content in the emulsion composition can be the remainder after excluding components other than water contained in the emulsion composition. The aqueous phase may also contain components other than water, specifically water-soluble optional components or other components described below.

[0107] Next, the outer oil phase O in the O1 / W / O type emulsion composition will be described. The proportion of the outer oil phase in the emulsion composition is preferably 5 to 40% by mass, more preferably 10 to 38% by mass, even more preferably 15 to 36% by mass, and even more preferably 20 to 30% by mass, from the viewpoint of improving the emulsion stability of the emulsion composition and improving the non-squeaky feel when used.

[0108] In the present embodiment, the ratio of the total mass of the inner oil phase and the aqueous phase to the mass of the outer oil phase in an O1 / W / O emulsion composition, i.e., the mass ratio expressed as ((O1+W) / O), is preferably 1 to 19, more preferably 1.5 to 10, and even more preferably 2 to 5, from the viewpoint of improving the emulsion stability of the emulsion composition. Furthermore, in this embodiment, the total mass ratio of the inner oil phase and the outer oil phase in an O1 / W / O emulsion composition, i.e., the mass ratio expressed as (O1+O) to the entire emulsion composition, is preferably (O1+O) / (O1+W+O)=0.05 to 0.5, more preferably 0.1 to 0.45, and even more preferably 0.15 to 0.4, from the viewpoint of improving the emulsion stability of the emulsion composition.

[0109] Next, a method for producing the emulsion composition of this embodiment will be described. The W / O emulsion composition and O1 / W / O emulsion composition of this embodiment can be produced by, for example, a known production method. When producing an O1 / W / O emulsion composition, a two-stage emulsification method is preferably used from the viewpoint of improving the emulsion stability of the emulsion composition. A milky white or transparent to translucent O1 / W / O emulsion composition can be obtained by re-emulsifying an internal phase O1 / W emulsion composition that has been prepared in advance by a conventional method in an oil agent in which the components of the outer oil phase are dissolved, swollen, or dispersed.

[0110] The emulsion composition obtained according to this embodiment can be made into various forms, for example, cosmetics such as emulsions, creams such as hair creams and hand creams, emulsion foundations, and beauty serums. The emulsion composition of the present embodiment can be used by applying it to the skin, particularly the skin excluding the hair, preferably the face, body, hands, feet, etc. The emulsion composition of the present embodiment can also be used on the scalp or hair.

[0111] Although the embodiments of the present invention have been described above, these are merely examples of the present invention, and various other configurations can also be adopted.

[0112] In relation to the above-mentioned embodiments, the present invention further discloses the following compositions, manufacturing methods, and uses.

[0113] <1> The following components (A), (B), (C), (D), and (E): (A) glycerin mono-fatty acid ester having 12 to 26 carbon atoms, (B) a higher alcohol having 10 to 22 carbon atoms; (C) Ceramides, (D) one or more selected from sphingosine and its salts, and ionic surfactants; (E) A nonionic surfactant containing the following (e1) and (e2): (e1) One or more selected from crosslinked polyether-modified silicones and crosslinked polyglycerin-modified silicones (e2) A W / O type emulsion composition containing one or more selected from polyether-modified silicones, polyglycerin-modified silicones, and polyglycerin fatty acid esters. <2> The content of component (e1) in the composition is preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.5% by mass or more and 2% by mass or less, and even more preferably 0.75% by mass or more and 1.5% by mass or less. <1> The W / O type emulsion composition according to claim 1. <3> The content of component (e2) in the composition is preferably 0.1% by mass or more and 10% by mass or less, more preferably 2.5% by mass or more and 5% by mass or less, and even more preferably 3% by mass or more and 4% by mass or less. <1> or <2> The W / O type emulsion composition according to claim 1. <4> The mass ratio (e2 / e1) of the component (e1) to the component (e2) is preferably 0.1 or more and 8 or less, more preferably 1 or more and 5 or less, and even more preferably 3 or more and 5 or less. <1> ~ <3> 1. The W / O type emulsion composition according to any one of the above. <5> The aqueous phase contains components (A) to (D). <1> ~ <4> 1. The W / O type emulsion composition according to any one of the above. <6> An O1 / W / O type emulsion cosmetic composition in which an inner oil phase O1 is dispersed in the aqueous phase of a W / O type emulsion composition, and the inner oil phase (O1) contains components (A) to (D). <1> ~ <5> 1. The W / O type emulsion composition according to any one of the above. <7> Component (D) is an anionic surfactant, and further contains (F) a nonionic surfactant other than (e1) and (e2) with an HLB of 8 or more, and (G) one or more selected from inorganic acids and organic acids having 6 or less carbon atoms. <1> ~ <6> 1. The W / O type emulsion composition according to any one of the above. <8> The mass ratio (F / G) of component (F) to component (G) is preferably 0.3 or more and 6.0 or less, more preferably 0.7 or more and 5.5 or less, even more preferably 1.0 or more and 5.0 or less, and even more preferably 1.2 or more and 4.0 or less. <7> The W / O type emulsion composition <9> The mass ratio (F / A) of component (F) to component (A) is preferably 0.1 or more and 1.5 or less, more preferably 0.2 or more and 1.3 or less, and even more preferably 0.25 or more and 1.0 or less. <7> or <8> The W / O type emulsion composition described above. <10> The aqueous phase contains components (A) to (D), (F), and (G). <7> ~ <9> 1. The W / O type emulsion composition according to any one of the above. <11> An O1 / W / O type emulsion cosmetic composition in which an inner oil phase O1 is dispersed in the aqueous phase of a W / O type emulsion composition, and the inner oil phase (O1) contains components (A) to (D) and (F). <7> ~ <10> 1. The W / O type emulsion composition according to any one of the above. <12> An O1 / W / O type emulsion cosmetic in which an inner oil phase O1 is dispersed in the aqueous phase of a W / O type emulsion composition, and the inner oil phase (O1) contains components (A) to (D) and (F). <7> ~ <11> 1. The W / O type emulsion composition according to any one of the above. <13> The following components (A), (B), (C), (D), and (E): (A) one or more selected from glycerin monobehenate, glycerin monostearate, and glycerin monopalmitate, (B) one or more selected from stearyl alcohol, cetyl alcohol, and behenyl alcohol; (C) Ceramides, (D) one or more selected from sphingosine and its salts, N-acyl glutamic acids having 12 to 22 carbon atoms, and N-alkyloylmethyl taurine salts having 12 to 22 carbon atoms; (E) A nonionic surfactant containing the following (e1) and (e2): (e1) One or more selected from crosslinked polyether-modified silicones and crosslinked polyglycerin-modified silicones (e2) one or more selected from polyether-modified silicones, polyglycerin-modified silicones, and polyglycerin fatty acid esters; Contains An O1 / W / O type emulsion cosmetic composition in which an inner oil phase O1 is dispersed in the aqueous phase of a W / O type emulsion composition, and the O1 / W / O type emulsion cosmetic composition contains components (A) to (D) in the inner oil phase (O1). <14> The following components (A), (B), (C), (D), and (E): (A) one or more selected from glycerin monobehenate, glycerin monostearate, and glycerin monopalmitate, (B) one or more selected from stearyl alcohol, cetyl alcohol, and behenyl alcohol; (C) Ceramides, (D) one or more selected from sphingosine and its salts, N-acyl glutamic acids having 12 to 22 carbon atoms, and N-alkyloylmethyl taurine salts having 12 to 22 carbon atoms; (E) A nonionic surfactant containing the following (e1) and (e2): (e1) One or more selected from crosslinked polyether-modified silicones and crosslinked polyglycerin-modified silicones (e2) one or more selected from polyether-modified silicones, polyglycerin-modified silicones, and polyglycerin fatty acid esters; Contains The mass ratio (e2 / e1) of the component (e1) to the component (e2) is 3 or more and 5 or less, An O1 / W / O type emulsion cosmetic composition in which an inner oil phase O1 is dispersed in the aqueous phase of a W / O type emulsion composition, and the O1 / W / O type emulsion cosmetic composition contains components (A) to (D) in the inner oil phase (O1). <15> The following components (A), (B), (C), (D), and (E): (A) one or more selected from glycerin monobehenate, glycerin monostearate, and glycerin monopalmitate, (B) one or more selected from stearyl alcohol, cetyl alcohol, and behenyl alcohol; (C) Ceramides, (D) one or more selected from sphingosine and its salts, N-acyl glutamic acids having 12 to 22 carbon atoms, and N-alkyloylmethyl taurine salts having 12 to 22 carbon atoms; (E) A nonionic surfactant containing the following (e1) and (e2): (e1) one or more crosslinked polyether-modified silicones selected from (dimethicone / (PEG-10 / 15)) crosspolymer, (PEG-15 / lauryl dimethicone) crosspolymer, (PEG-10 / lauryl dimethicone) crosspolymer and (PEG-15 / lauryl dimethicone) crosspolymer, and crosslinked polyglycerin-modified silicones selected from (dimethicone / polyglycerin-3) crosspolymer and (lauryl dimethicone / polyglycerin-3) crosspolymer, (e2) one or more selected from PEG-3 dimethicone, PEG-10 dimethicone, PEG-12 dimethicone, PEG-11 methyl ether dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, cetyl PEG / PPG-10 / 1 dimethicone, and diglycerin fatty acid esters; Contains the mass ratio (e2 / e1) of the component (e1) to the component (e2) is 0.1 or more and 8 or less, An O1 / W / O type emulsion cosmetic composition in which an inner oil phase O1 is dispersed in the aqueous phase of a W / O type emulsion composition, and the O1 / W / O type emulsion cosmetic composition contains components (A) to (D) in the inner oil phase (O1). <16> The following components (A), (B), (C), (D), and (E): (A) one or more selected from glycerin monobehenate, glycerin monostearate, and glycerin monopalmitate, (B) one or more selected from stearyl alcohol, cetyl alcohol, and behenyl alcohol; (C) Ceramides, (D) one or more selected from sphingosine and its salts, N-acyl glutamic acids having 12 to 22 carbon atoms, and N-alkyloylmethyl taurine salts having 12 to 22 carbon atoms; (E) A nonionic surfactant containing the following (e1) and (e2): (e1) one or more crosslinked polyether-modified silicones selected from (dimethicone / (PEG-10 / 15)) crosspolymer, (PEG-15 / lauryl dimethicone) crosspolymer, (PEG-10 / lauryl dimethicone) crosspolymer and (PEG-15 / lauryl dimethicone) crosspolymer, and crosslinked polyglycerin-modified silicones selected from (dimethicone / polyglycerin-3) crosspolymer and (lauryl dimethicone / polyglycerin-3) crosspolymer, (e2) one or more selected from PEG-3 dimethicone, PEG-10 dimethicone, PEG-12 dimethicone, PEG-11 methyl ether dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, cetyl PEG / PPG-10 / 1 dimethicone, and diglycerin fatty acid esters; Contains The mass ratio (e2 / e1) of the component (e1) to the component (e2) is 3 or more and 5 or less, An O1 / W / O type emulsion cosmetic composition in which an inner oil phase O1 is dispersed in the aqueous phase of a W / O type emulsion composition, and the O1 / W / O type emulsion cosmetic composition contains components (A) to (D) in the inner oil phase (O1). <17> The content of component (A) is 0.2 to 10% by mass relative to the total emulsion composition; the content of component (B) is 0.2 to 10% by mass relative to the total emulsion composition; the content of component (C) is 0.5 to 10% by mass relative to the total emulsion composition; the content of component (D) is 0.05 to 5% by mass relative to the total emulsion composition; the content of component (e1) is 0.1% by mass or more and 10% by mass or less relative to the total emulsion composition; and the content of component (e2) is 0.1% by mass or more and 10% by mass or less relative to the total emulsion composition. <13> ~ <16> The O1 / W / O emulsion cosmetic composition according to any one of the above. <18> The content of component (A) is 0.5 to 1.0% by mass relative to the total emulsion composition; the content of component (B) is 0.5 to 1.0% by mass relative to the total emulsion composition; the content of component (C) is 0.8 to 5% by mass relative to the total emulsion composition; the content of component (D) is 0.4 to 2% by mass relative to the total emulsion composition; the content of component (e1) is 0.75% by mass or more and 1.5% by mass or less relative to the total emulsion composition; and the content of component (e2) is 3% by mass or more and 4% by mass or less relative to the total emulsion composition. <13> ~ <16> The emulsified cosmetic composition according to any one of the above. <19> The following components (A), (B), (C), (D), (E), (F), and (G): (A) one or more selected from glycerin monobehenate, glycerin monostearate, and glycerin monopalmitate, (B) one or more selected from stearyl alcohol, cetyl alcohol, and behenyl alcohol; (C) Ceramides, (D) one or more selected from the group consisting of N-acylglutamic acids having 12 to 22 carbon atoms or salts thereof and N-alkyloylmethyltaurine salts having 12 to 22 carbon atoms; (E) A nonionic surfactant containing the following (e1) and (e2): (e1) One or more selected from crosslinked polyether-modified silicones and crosslinked polyglycerin-modified silicones (e2) one or more selected from polyether-modified silicones, polyglycerin-modified silicones, and polyglycerin fatty acid esters; (F) a nonionic surfactant other than (e1) and (e2) having an HLB of 8 or more and 20 or less; (G) One or more selected from inorganic acids and organic acids having 6 or less carbon atoms Contains An O1 / W / O type emulsion cosmetic composition in which an inner oil phase O1 is dispersed in the aqueous phase of a W / O type emulsion composition, and the O1 / W / O type emulsion cosmetic composition contains components (A) to (D) and (F) in the inner oil phase (O1). <20> The following components (A), (B), (C), (D), (E), (F), and (G): (A) glycerin mono-fatty acid ester having 12 to 26 carbon atoms, (B) a higher alcohol having 10 to 22 carbon atoms; (C) Ceramides, (D) one or more selected from the group consisting of N-acylglutamic acids having 12 to 22 carbon atoms or salts thereof and N-alkyloylmethyltaurine salts having 12 to 22 carbon atoms; (E) A nonionic surfactant containing the following (e1) and (e2): (e1) One or more selected from crosslinked polyether-modified silicones and crosslinked polyglycerin-modified silicones (e2) one or more selected from polyether-modified silicones, polyglycerin-modified silicones, and polyglycerin fatty acid esters; (F) a nonionic surfactant other than (e1) and (e2) having an HLB of 8 or more and 20 or less; (G) one or more organic or inorganic acids selected from malic acid, lactic acid, citric acid, succinic acid, glutamic acid, adipic acid, and phosphoric acid; Contains An O1 / W / O type emulsion cosmetic composition in which an inner oil phase O1 is dispersed in the aqueous phase of a W / O type emulsion composition, and the O1 / W / O type emulsion cosmetic composition contains components (A) to (D) and (F) in the inner oil phase (O1). <21> The following components (A), (B), (C), (D), (E), (F), and (G): (A) glycerin mono-fatty acid ester having 12 to 26 carbon atoms, (B) a higher alcohol having 10 to 22 carbon atoms; (C) Ceramides, (D) N-alkyloylmethyl taurine salts having 16 to 20 carbon atoms, (E) A nonionic surfactant containing the following (e1) and (e2): (e1) One or more selected from crosslinked polyether-modified silicones and crosslinked polyglycerin-modified silicones (e2) one or more selected from polyether-modified silicones, polyglycerin-modified silicones, and polyglycerin fatty acid esters; (F) a nonionic surfactant other than (e1) and (e2) having an HLB of 14 or more and 20 or less; (G) One or more organic or inorganic acids selected from malic acid, lactic acid, citric acid, succinic acid, glutamic acid, adipic acid, and phosphoric acid Contains An O1 / W / O type emulsion cosmetic composition in which an inner oil phase O1 is dispersed in the aqueous phase of a W / O type emulsion composition, and the O1 / W / O type emulsion cosmetic composition contains components (A) to (D) and (F) in the inner oil phase (O1). <22> The content of component (A) is 0.2 to 10% by mass relative to the total emulsion composition; the content of component (B) is 0.2 to 10% by mass relative to the total emulsion composition; the content of component (C) is 0.5 to 10% by mass relative to the total emulsion composition; the content of component (D) is 0.05 to 5% by mass relative to the total emulsion composition; the content of component (e1) is 0.1% by mass or more and 10% by mass or less relative to the total emulsion composition; the content of component (e2) is 0.1% by mass or more and 10% by mass or less relative to the total emulsion composition; the content of component (F) is 0.05 to 1% by mass relative to the total emulsion composition; and the content of component (G) is 0.01 to 2% by mass relative to the total emulsion composition. <21> The W / O type emulsion composition described above. <23> The content of component (A) is 0.5 to 1.0% by mass relative to the total emulsion composition; the content of component (B) is 0.5 to 1.0% by mass relative to the total emulsion composition; the content of component (C) is 0.8 to 5% by mass relative to the total emulsion composition; the content of component (D) is 0.4 to 2% by mass relative to the total emulsion composition; the content of component (e1) is 0.75% by mass or more and 1.5% by mass or less relative to the total emulsion composition; the content of component (e2) is 3% by mass or more and 4% by mass or less relative to the total emulsion composition; the content of component (F) is 0.2 to 0.7% by mass relative to the total emulsion composition; and the content of component (G) is 0.1 to 0.2% by mass relative to the total emulsion composition. <19> ~ <21> The emulsified cosmetic composition according to any one of the above. [Example]

[0114] (Examples 1 to 22 and Comparative Examples 1 to 4) Emulsion compositions having the compositions shown in Tables 1 to 4 were produced and evaluated for temperature cycle stability and feel in use (richness and spreadability) using the methods described below. The results are also shown in Tables 1 to 4.

[0115] (Manufacturing method) The emulsion compositions of each example were prepared according to the following procedure. (1) Components (A) to (D) and a polyhydric alcohol were mixed and dissolved uniformly at 80°C. (2) Water and other aqueous phase components were mixed and dissolved uniformly at 80°C. (3) The mixture obtained in (2) was added to the mixture obtained in (1) to prepare an O / W emulsion composition by phase inversion emulsification, and then the mixture was allowed to cool to room temperature (25°C). (4) The outer oil phase components were mixed uniformly at room temperature (25°C). (5) The emulsion composition obtained in (3) was added to the mixture obtained in (4), and the mixture was emulsified by stirring until uniform, thereby obtaining an O / W / O emulsion composition.

[0116] (Evaluation method) (Temperature cycle stability) 50 g of each emulsion composition was placed in a polypropylene container, sealed, and stored in a storage cabinet at 50°C for 12 hours and then at -5°C for 12 hours, which constituted one cycle (one day). Evaluation was based on the following criteria. A: The emulsion state is maintained for more than 15 days. B: Separates in 8 to 14 days C: Separates in 4-7 days D: Separates in 1-3 days E: Separation in less than 1 day

[0117] (Feeling of use) Three expert panelists evaluated the richness and spreadability of the cosmetics made from the emulsion compositions obtained in each example when they were applied to the inner forearm. Each item was evaluated according to the following criteria, and the average score of the three panelists was calculated. (richness) The criteria were divided into five levels, with 5 being a rating of extremely rich, 4 being a rating of excellent richness, 3 being a rating of some richness, 2 being a rating of no richness, and 1 being a rating of no richness at all and therefore unsuitable for practical use. (Good stretchability) The criteria were divided into five levels, with 5 being a rating of extremely good stretchability, 4 being a rating of excellent stretchability, 3 being a rating of good stretchability, 2 being a rating of poor stretchability, and 1 being a rating of no stretchability at all and therefore unusable.

[0118] The ingredients used in the table are as follows: *1: Sansoft No. 8100, manufactured by Taiyo Kagaku Co., Ltd. *2: Cetyl Alcohol NX, manufactured by Kokyu Alcohol Kogyo Co., Ltd. *3: Softcare SL-E, manufactured by Kao Corporation *4: Nikkor SMT, manufactured by Nikko Chemicals Co., Ltd. *5: 86% glycerin, manufactured by Kao Corporation *6: Pearleem EX, manufactured by NOF Corporation *7: KSG-210, manufactured by Shin-Etsu Chemical Co., Ltd. (active ingredient 25%) *8: KF-6017P, manufactured by Shin-Etsu Chemical Co., Ltd. *9: Cosmol 42V, manufactured by Nisshin Oillio Group *10: Phytosphingosine, manufactured by Evonik Industries AG *11:PURE L-GLUTAMIC ACID, made by AJINOMOTO FOODS EUROPE SAS *12: KSG-310, manufactured by Shin-Etsu Chemical Co., Ltd. (active ingredient 30%) *13: KSG-710, manufactured by Shin-Etsu Chemical Co., Ltd. (active ingredient 25%) *14: KF-6015, manufactured by Shin-Etsu Chemical Co., Ltd. *15: Emanon CH-60, manufactured by Kao Corporation *16: Eucalyptus Extract K, manufactured by Koei Kogyo Co., Ltd. *17: Asunaro Liquid KB, manufactured by Ichimaru Falcos *18: Silicone KF-96L-2CS, manufactured by Shin-Etsu Chemical Co., Ltd. *19: Leopard KL2, manufactured by Chiba Flour Mills *20: Emarex HC-5, manufactured by Nippon Emulsion Co., Ltd. *21: Concentrated glycerin for cosmetics, manufactured by Kao Corporation *22: Emanon CH-25, manufactured by Kao Corporation *23: Emulgen 1620G, manufactured by Kao Corporation *24: Emanon 3199V, manufactured by Kao Corporation *25: Leodor 460V, manufactured by Kao Corporation *26: Leodor TW-S320V, manufactured by Kao Corporation *27: Emarex HC-10, manufactured by Nippon Emulsion Co., Ltd.

[0119] [Table 1]

[0120] [Table 2]

[0121] [Table 3]

[0122] [Table 4]

[0123] (Examples 22 to 33 and Comparative Examples 5 to 10) Emulsion compositions having the compositions shown in Tables 5 to 8 were prepared and evaluated for high-temperature stability (60°C) and usability (sustained moisturizing sensation, thickness upon application, skin-protecting sensation, lack of squeaking sensation upon application, and smooth skin sensation) using the methods described below. The results are also shown in Tables 5 to 8. The pH of the aqueous layers in Examples 22 to 32 and Comparative Examples 5 to 10 was all 4.5.

[0124] (Manufacturing method) The emulsion compositions of each example were prepared according to the following procedure. (1) Components (A) to (D), (F) and a polyhydric alcohol were mixed and dissolved uniformly at 80°C. (2) Water and other aqueous phase components were mixed and dissolved uniformly at 80°C. (3) The mixture obtained in (2) was added to the mixture obtained in (1) to prepare an O / W emulsion composition by phase inversion emulsification, and then the mixture was allowed to cool to room temperature (25°C). (4) The outer oil phase components were mixed uniformly at room temperature (25°C). (5) The emulsion composition obtained in (3) was added to the mixture obtained in (4), and the mixture was emulsified by stirring until uniform, thereby obtaining an O / W / O emulsion composition.

[0125] (Evaluation method) (high temperature stability) (Emulsion stability (visual)) 40 g of each emulsion composition was placed in a polypropylene container and stored at 60°C for 10 days, after which the condition was visually evaluated and rated according to the following criteria. ○: Emulsified state is maintained △: A slight separation is observed, but the emulsion is maintained overall ×: Separation is observed (viscosity stability) The viscosity of each emulsion composition before and after storage at 60°C was measured using a B8R viscometer (rotor No. TC, 5 rpm, 60 seconds), and the viscosity ratio before and after storage (after storage / before storage) was expressed according to the following criteria. ○: Less than 1.5 times △: 1.5 times or more but less than 3 times ×: 3 times or more

[0126] (Feeling of use) The cosmetics made from the emulsion compositions obtained in each example were applied to the inner forearm, and the following evaluations were made regarding the sensation of use: duration of moist feeling, thickness upon application, feeling of skin protection, absence of squeaky feeling upon application, and feeling of smoothness on the skin. Each item was evaluated individually according to the following criteria, and a final evaluation was determined after discussion. (Long-lasting moisturizing effect) The criteria were divided into four levels, with 4 being a very moist feeling, 3 being a moist feeling, 2 being a slight moist feeling, and 1 being no moist feeling at all and therefore unusable. (Thickness when applied) The criteria were divided into four levels, with 4 being a very thick feeling, 3 being a feeling of thickness, 2 being a feeling of thickness to some extent, and 1 being a feeling of thickness that was not at all practically usable. (Protecting the skin) The evaluation was divided into four levels, with 4 being when it was judged that the product strongly protected the skin, 3 being when it was judged that it slightly protected the skin, 2 being when it was judged that it did not protect the skin at all and was judged to be unusable in practice. (No squeaking when applied) The criteria were divided into four levels, with 4 being when it was judged that no creaking was felt at all, 3 being when it was judged that there was some creaking, 2 being when it was judged that there was creaking but it was usable, and 1 being when it was judged that there was a lot of creaking and it was very uncomfortable and not usable. (Skin feels smooth) The criteria were divided into four levels, with 4 being when it was judged that the skin felt very smooth, 3 being when it was judged that the skin felt slightly smooth, 2 being when it was judged that the skin felt somewhat smooth, and 1 being when it was judged that the skin did not feel smooth at all and was not suitable for practical use.

[0127] [Table 5]

[0128] [Table 6]

[0129] [Table 7]

[0130]

Table 8

Claims

1. The following components (A), (B), (C), (D), and (E): (A) a glycerin mono-fatty acid ester having 12 to 26 carbon atoms, (B) a higher alcohol having 10 to 22 carbon atoms, (C) ceramides, (D) one or more selected from sphingosine and its salts, and anionic surfactants; (E) A nonionic surfactant containing the following (e1) and (e2): (e1) 0.1% by mass or more and 10% by mass or less of one or more selected from crosslinked polyether-modified silicones and crosslinked polyglycerin-modified silicones (e2) 0.1% by mass or more and 10% by mass or less of one or more selected from polyether-modified silicones, polyglycerin-modified silicones, and polyglycerin fatty acid esters and the mass ratio of component (e1) to component (e2) (e2 / e1) is 0.1 or more and 10 or less.

2. 2. The O / W / O emulsion composition according to claim 1, comprising components (A) to (D) in the aqueous phase.

3. 3. The O / W / O emulsion composition according to claim 1 or 2, further comprising (F) a nonionic surfactant other than (e1) and (e2) having an HLB of 8 or more, and (G) one or more selected from inorganic acids and organic acids having 6 or less carbon atoms.

4. 4. The O / W / O emulsion composition according to claim 3, wherein the mass ratio (F / G) of component (F) to component (G) is 0.3 or more and 6.0 or less.

5. 5. The O / W / O emulsion composition according to claim 3, wherein the mass ratio (F / A) of component (F) to component (A) is 0.1 or more and 1.5 or less.

6. 6. The O / W / O emulsion composition according to any one of claims 3 to 5, comprising components (A) to (D), (F), and (G) in an aqueous phase.

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