JP7725186B2 - W/O type emulsion composition - Google Patents

Description

The present invention relates to a W/O type emulsion composition.

Ceramides are a type of sphingolipid that are found in high concentrations in cell membranes. They are known to form the lipid barrier in the skin as a key component of interstitial cell lipids and play an important role in keeping the skin soft and moisturized. They are also an effective ingredient in topical skin preparations that increase the moisture-retaining ability of the stratum corneum, which is one way to improve rough skin.

Since these ceramides are highly crystalline and difficult to stably incorporate into emulsion systems, various techniques have been reported, including 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 blended with a liquid oil and 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, a diester of N-acylglutamic acid, 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).

Japanese Patent Application Laid-Open No. 2006-273747 Japanese Patent Application Publication No. 03-47108 Special Publication No. 2010-513221 JP 2016-104730 A

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 the 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.

Therefore, the present inventors have conducted extensive research on the O/W/O type topical skin preparation of Patent Document 4, which contains ceramides, and have found 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 have completed the present invention.

That is, the present invention provides a composition comprising 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 ionic surfactants;
(E) A nonionic surfactant containing the following (e1) and (e2): (e1) one or more surfactants selected from crosslinked polyether-modified silicones and crosslinked polyglycerin-modified silicones; and (e2) a W/O emulsion composition containing one or more surfactants selected from polyether-modified silicones, polyglycerin-modified silicones, and polyglycerin fatty acid esters.

The W/O emulsion composition of the present invention has excellent emulsion system stability even after temperature cycle storage, and also has an excellent feel when applied to the skin, such as a rich texture and good spreadability.

The W/O emulsion composition of the present invention is a composition containing the following components (A) to (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 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; and (e2) one or more selected from polyether-modified silicones, polyglycerin-modified silicones, and polyglycerin fatty acid esters.

(Component (A))
Component (A) is a glycerin mono-fatty acid ester having 12 to 26 carbon atoms.
From the viewpoints of suppressing precipitation of component (C), which will be described later, and imparting a favorable feeling during use, 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.

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

In this embodiment, component (A) can be used alone or in combination with two or more types. 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, even 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 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.

(Component (B))
Component (B) is a higher alcohol having 10 to 22 carbon atoms.
From the viewpoints of suppressing precipitation of component (C), which will be described later, and imparting a favorable feeling during use, the number of carbon atoms in component (B) is preferably 14 or more, more preferably 16 or more, and is preferably 20 or less, and even more preferably 18 or less.

In this embodiment, component (B) can be used alone or in combination of two or more types. Specific examples of component (B) in this embodiment include monohydric alcohols such as myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, and oleyl alcohol. Of 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.

In this 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, even 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 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.

In addition, 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% by mass, more preferably 0.4 to 8% by mass, even more preferably 0.6 to 3% by mass, even more preferably 0.7 to 2.5% by mass, and particularly preferably 0.8 to 2.0% by mass, based on the total mass of the emulsion composition, from the viewpoint of improving the emulsion stability of the emulsion composition.

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.

(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 2013-53146 A can be used.

Specific examples of natural ceramides include ceramide 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)).

Further included are N-alkyl forms (for example, N-methyl forms) of these.
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 compounds may be that of the natural form, or any other non-natural form, or may be a mixture of these. Among these, the compounds CERAMIDE 1, CERAMIDE 2, CERAMIDE 3, CERAMIDE 5, and CERAMIDE 6II (all INCI, 8th Edition) and those represented by the following formula are preferred:

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.).

Another example of a pseudo-ceramide is the one shown in general formula (5) below.

(In the above general formula (5), R ²⁵ represents a hydrogen atom or a linear, branched, or cyclic, saturated or unsaturated hydrocarbon group having 10 to 22 carbon atoms which may be substituted with a hydroxyl group; 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 attached via an ester bond to the ω-terminus of the hydrocarbon group; and 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.)

Particularly preferred as R ²⁶ 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.

When R ²⁵ 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; when 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 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. The hydroxyalkoxy group or alkoxy group for R ²⁷ is preferably one having 1 to 7 carbon atoms.
Specific examples of the compound represented by the general formula (5) include those represented by the following formula:

As the compound represented by general formula (5), those in which R ²⁵ is a hexadecyl group, X ¹⁹ is a hydrogen atom, R ²⁶ is a pentadecyl group, and R ²⁷ is a hydroxyethyl group; pseudo-ceramides in which R ²⁵ is a hexadecyl group, X ¹⁹ is a hydrogen atom, R ²⁶ is a nonyl group, and R ²⁷ is a hydroxyethyl group are preferred, and those in which R ²⁵ is a hexadecyl group, X ¹⁹ is a hydrogen atom, R ²⁶ is a pentadecyl group, and R ²⁷ is a hydroxyethyl group (N-(hexadecyloxyhydroxypropyl)-N-hydroxyethylhexadecanamide) of general formula (5) are even more preferred. Compounds represented by the following formula are also preferred:

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 viewpoints of improving the stability of the emulsion composition and reducing stickiness upon application.

Furthermore, with regard to 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.

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 0.5 to 3.5, more preferably 0.7 to 3.0, and even more preferably 1.0 to 2.8.

(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):

(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 represent a hydrogen atom, a hydroxyl group or an acetoxy group, and 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, either X ¹ or X ² is a hydrogen atom and the other is absent; when X ⁴ forms an oxo group, X ³ does not exist); R ² and R Each ³ independently represents a hydrogen atom, a hydroxyl group, a hydroxymethyl group, or an acetoxymethyl group; each of the a R 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.

In the formula, ^R1 is 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, a carbonyl group, or an 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 branch 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.

Y represents a methylene group (CH ₂ ), a methine group (CH) or an oxygen atom.
^X1 , ^X2 , and ^X3 each independently represent a hydrogen atom, a hydroxyl group, or an acetoxy group, and ^X4 represents a hydrogen atom, an acetyl group, a glyceryl group, or a substituent that forms an oxo group together with the adjacent oxygen atom. Among these, it is preferable that 0 to 1 of ^X1 , ^X2 , and ^X3 are hydroxyl groups, the remainder are hydrogen atoms, and ^X4 is a hydrogen atom. When Y is a methine group, only one of ^X1 and ^X2 is a hydrogen atom, and the other is absent. When ^X4 forms an oxo group, ^X3 is absent.

^R2 and ^R3 each independently represent a hydrogen atom, a hydroxyl group, a hydroxymethyl group, or an acetoxymethyl group, and it is more preferable that ^R3 is a hydrogen atom.

Furthermore, a represents the number 2 or 3, and when a is 2, R represents R ⁴ and R ⁵ , and when a is 3, R represents R ⁴ , R ⁵ and R ⁶ .

^R4 , ^R5 , and ^R6 each independently represent 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. The hydroxyalkoxy group that may substitute for the hydrocarbon group is preferably a linear or branched hydroxyalkoxy group having 1 to 7 carbon atoms. Furthermore, the alkoxy group is preferably a linear or branched alkoxy group having 1 to 7 carbon atoms. Examples of R ⁴ , R ⁵ and R ⁶ 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, or a hydrocarbon group having a total of 1 to 8 carbon atoms substituted with 1 to 6 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.

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.

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

(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; Y ₁ represents a methylene group or a methine group; X ⁵ , X ⁶ and X ⁷ each independently represent 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 Y ₁ is a methine group, either one of X ⁵ and X ⁶ represents a hydrogen atom and the other is absent; when X ⁸ forms an oxo group, X ⁷ does not exist); R ⁸ represents a hydroxymethyl group or an acetoxymethyl group; a number of R Each ₁ is independently 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 is the number 2 or 3; and the dashed line indicates that an unsaturated bond may be present.

Here, ^R7 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.

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

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

These sphingosine salts include salts of acidic amino acids such as glutamic acid and aspartic acid; salts of basic amino acids such as arginine; salts of inorganic acids such as phosphoric acid and hydrochloric acid; salts of monocarboxylic acids such as acetic acid; salts of dicarboxylic acids such as succinic acid; and salts of hydroxycarboxylic acids such as citric acid, lactic acid, and malic acid. One or more selected from these is preferred.

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-C22 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;
C12-C22 alkyl phosphates 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;
C12-C24 dialkyl sulfosuccinic acids 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; and Acylglycines having 12 to 22 carbon atoms or salts thereof, such as sodium N-cocoyl acylglycine;
Examples thereof include acyl alanines having 12 to 22 carbon atoms, such as sodium N-coconut oil fatty acid acylalanine, or salts thereof; or N-acyl glutamic acids having 12 to 22 carbon atoms, such as sodium dilauroyl glutamate, monosodium N-lauroyl glutamate, sodium N-stearoyl-L-glutamate, arginine N-stearoyl glutamate, sodium N-stearoyl glutamate, sodium N-myristoyl-L-glutamate, or salts thereof, acylaspartates, lysine diacyl glutamate salts, acyl arginine salts, dialkyldimethylammonium salts, and alkyltrimethylammonium salts.

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. Examples include alkyltrimethylammonium salts such as stearyltrimethylammonium chloride and behenyltrimethylammonium chloride, dialkyldimethylammonium salts, and trialkylmethylammonium salts.

Further examples of amphoteric surfactants include alkyldimethylamine oxide, alkylcarboxybetaine, alkylsulfobetaine, amide amino acid salts, and alkylamidopropylbetaine, with alkylamidopropylbetaine being preferred.

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, as the anionic surfactant, from the viewpoint of improving the emulsion stability of the emulsion composition, a surfactant other than a fatty acid or a salt thereof is preferred, and one or more selected from polyoxyethylene alkyl ether phosphate or a salt thereof having 12 to 22 carbon atoms, N-alkyloylmethyl taurine salts having 12 to 22 carbon atoms, and N-acyl glutamates having 12 to 22 carbon atoms are preferred, and from the viewpoint of obtaining a preferable feel when used, one or two selected from the group consisting of N-acyl glutamic acid or a salt thereof having 12 to 22 carbon atoms, and N-alkyloylmethyl taurine salts 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 when used, 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 sensation 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.

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 during use, particularly good spreadability, acyl methyl taurine salt is even more preferable.

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% by mass, preferably 0.05 to 5% by mass, more preferably 0.1 to 3% by mass, even more preferably 0.1 to 2% by mass, and particularly preferably 0.3 to 1% by mass, based on the total mass of the emulsion composition.

With regard 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, still more preferably 0.2 or less, and especially preferably 0.15 or less.

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% by mass, more preferably 0.5 to 12% by mass, even more preferably 1 to 10% by mass, still more preferably 2 to 8% by mass, particularly preferably 3.5 to 7% by mass, and especially preferably 3.5 to 5% by mass, based on the total emulsion composition, from the viewpoint of improving the stability of the emulsion composition at low temperatures.

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 sensation in use, 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 layer 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).

(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; and (e2) one or more selected from polyether-modified silicones, polyglycerin-modified silicones, and polyglycerin fatty acid esters.
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.

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

(In the formula, each ^R 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, and 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, provided that e and f are not both 0. 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:

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

(e1) Crosslinked polyether-modified silicone can be produced, for example, by the method described in JP-A-4-272932.
Furthermore, (e1) the 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.

As the (e1) crosslinked polyether-modified silicone, for example, 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.) can be used.
These crosslinked polyether-modified silicones can be used alone or in combination of two or more.

(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.

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 amount of the 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).

Among component (e2), polyether-modified silicone refers to silicone having a monovalent polyoxyalkyl group within its structure, and examples include those represented by the following general formula (4):

(In the above general formula (4), each R ¹¹ is the same or different and represents 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; R ¹² 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, provided that e and f are not both 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.

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, and examples thereof include 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.

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.

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

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 usability, 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.

The surface of the skin is maintained at a weakly acidic pH as part of maintaining 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, taking into consideration the 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 less carbon atoms, thereby providing a composition that exhibits little change in viscosity even after storage at high temperatures of 50°C or higher, has excellent emulsion stability, provides a sustained moist feeling, and has an excellent feel when used, such as a thick feeling when applied, a feeling of moisturizing the skin, no squeaking feeling when applied, and leaves the skin smooth.

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-C22 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;
C12-C22 alkyl phosphates or salts thereof, such as sodium monostearyl phosphate;
C12 to C22 alkyl ether phosphates or salts thereof, such as sodium polyoxyethylene oleyl ether phosphate and sodium polyoxyethylene stearyl ether phosphate;
C12-C24 dialkyl sulfosuccinic acids or salts thereof, such as sodium di-2-ethylhexyl sulfosuccinate;
N-alkyloylmethyltaurines having 12 to 22 carbon atoms or salts thereof, such as sodium N-stearoyl-N-methyltaurine;
Acylglycine having 12 to 22 carbon atoms or a salt thereof, such as sodium N-cocoylglycine;
Examples thereof include acyl alanines having 12 to 22 carbon atoms, such as sodium N-coconut oil fatty acid acylalanine, or salts thereof; or N-acyl glutamic acids having 12 to 22 carbon atoms, 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, or salts thereof.
As component (D), from the viewpoint of improving the emulsion stability of the emulsion composition, a substance other than a fatty acid or a salt thereof is preferred, and one or more selected from polyoxyethylene alkyl ether phosphate or a salt thereof having 12 to 22 carbon atoms, N-alkyloylmethyl taurine salts having 12 to 22 carbon atoms, and N-acyl glutamates having 12 to 22 carbon atoms are preferred, and from the viewpoint of obtaining a favorable feel in use, one or two selected from the group consisting of N-acyl glutamic acid or a salt thereof having 12 to 22 carbon atoms, and N-alkyloylmethyl taurine salts 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 favorable 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 sensation 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.

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 compounds selected from the group consisting of acylmethyltaurine salts, acylglutamates, acylaspartates, fatty acid salts, diacylglutamic acid lysine salts, and acylarginine salts.

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

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 0.03 or greater, even more preferably 0.08 or greater, and even more preferably 0.10 or greater, 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.

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% by mass, more preferably 0.5 to 12% by mass, even more preferably 1 to 10% by mass, still more preferably 2 to 8% by mass, particularly preferably 3.0 to 7% by mass, and especially preferably 3.5 to 5% by mass, based on the total emulsion composition, from the viewpoint of improving the stability of the emulsion composition at low temperatures.

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

(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 an 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 emulsification 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 calculated, for example, by the following formula.

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.)

(F) As a nonionic surfactant having an HLB of 8 or higher, one or more surfactants 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. are preferred. Of these, from the viewpoints of high-temperature emulsion stability, high-temperature viscosity stability, and achieving a favorable feel when used, one or more surfactants selected from polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, and polyoxyethylene fatty acid ester are more preferred.

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

Component (G) is an inorganic acid or an organic acid having 6 or less carbon atoms. By incorporating an inorganic acid or an organic acid into the aqueous phase, the skin surface is maintained in a homeostatic state while the feel upon 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.

In this embodiment, component (G) can be used alone or in combination with two or more types. 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 when used.

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 achieving a favorable feel when used, particularly a warm feeling upon application and a smooth feeling on the skin.

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 achieving a favorable feel upon use, particularly a warm feeling upon application and a smooth feeling on the skin.

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, the high-temperature viscosity stability, and obtaining a favorable sensation 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 layer 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 in this embodiment, more specifically, has a lamellar α-gel structure. The topical skin preparation in 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 in which crystallization of ceramides is suppressed during low-temperature storage, ceramides are stably incorporated, and which provides a pleasant feel when used, it is preferable that the inner oil phase (O1) contain components (A) to (D) and (F).

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. The ester oils and the like may be made from natural oils such as those derived from plants.

Among these, from the viewpoint of improving the feeling of use without a squeaky feeling, 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 components are contained, the content thereof is preferably about 10 to 50% by mass based on the total weight of the 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, based on the total outer layer oil phase (O). It is most preferable that the outer layer oil phase does not contain a polar oil having an IOB value of 0.1 or more.

Further 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 betaine and amino acid derivatives such as 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.

When these amino acids are included, their content is preferably approximately 0.001 to 3% by mass of the entire emulsion composition.

Plant extracts include, for example, 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, 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.

When these plant extracts are included, their content is preferably approximately 0.0001 to 2% by mass, in terms of dry solids, of the total emulsion composition.

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.

When these moisturizing agents are included, their content is preferably approximately 0.01 to 30% by mass of the entire emulsion composition.

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

When these anti-inflammatory agents are included, their content is preferably approximately 0.001 to 2% by mass of the entire emulsion composition.

Examples of preservatives include parahydroxybenzoic acid esters (parabens) such as methylparaben, dehydroacetic acid and its salts, and phenoxyethanol. Examples of auxiliary preservatives 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.

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.

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 emulsion composition is preferably 0.1 to 15% by mass, more preferably 0.5 to 12% by mass, even more preferably 1 to 10% by mass, even more preferably 2 to 8% by mass, and especially preferably 3.5 to 7% by mass, based on the total emulsion composition.

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 obtained by subtracting the outer layer oil phase O from the emulsion composition (in the case of an O1/W/O 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, the proportion of the aqueous phase W 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.

Next, the outer oil phase O in the O1/W/O type emulsion composition will be described.
The proportion of the outer layer 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 still 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 during use.

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 represented by ((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 the present embodiment, the total mass ratio of the inner layer oil phase and the outer layer 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.

Next, a method for producing the emulsion composition of this embodiment will be described.
For example, known production methods can be used to produce the W/O emulsion composition and O1/W/O emulsion composition of this embodiment. When producing an O1/W/O emulsion composition, a two-stage emulsification method is preferred from the viewpoint of improving the emulsion stability of the emulsion composition, and 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.

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.

The above describes embodiments of the present invention, but these are merely examples of the present invention, and various other configurations may also be adopted.

In relation to the above-described embodiments, the present invention further discloses the following compositions, manufacturing methods, and uses.

<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 ionic surfactants;
(E) A nonionic surfactant containing the following (e1) and (e2): (e1) one or more selected from a crosslinked polyether-modified silicone and a crosslinked polyglycerin-modified silicone; and (e2) a W/O type emulsion composition containing one or more selected from a polyether-modified silicone, a polyglycerin-modified silicone, and a polyglycerin fatty acid ester.
<2>
The W/O type emulsion composition according to <1>, wherein the content of the 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.
<3>
The content of component (e2) in the W/O emulsion composition according to <1> or <2> 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, in the composition.
＜4＞
The W/O type emulsion composition according to any one of <1> to <3>, wherein the content 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.
<5>
<4> The W/O type emulsion composition according to any one of <1> to <4>, comprising components (A) to (D) in the aqueous phase.
<6>
<5> The W/O emulsion composition according to any one of <1> to <5>, which is an O1/W/O emulsion cosmetic composition in which an inner layer oil phase O1 is dispersed in the aqueous phase of a W/O emulsion composition, and the inner layer oil phase (O1) contains components (A) to (D).
＜７＞
<6> The W/O type emulsion composition according to any one of <1> to <6>, wherein the component (D) is an anionic surfactant, 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 less carbon atoms.
＜8＞
<9> The W/O emulsion composition according to <7>, wherein 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 still more preferably 1.2 or more and 4.0 or less.
The W/O emulsion composition according to <7> or <8>, wherein the mass ratio (F/A) of the component (F) to the 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.
<10>
<9> The W/O type emulsion composition according to any one of <7> to <9>, wherein the aqueous phase contains components (A) to (D), (F), and (G).
<11>
<10> The W/O emulsion composition according to any one of <7> to <10>, which is an O1/W/O emulsion cosmetic composition in which an inner layer oil phase O1 is dispersed in the aqueous phase of a W/O emulsion composition, and the inner layer oil phase (O1) contains components (A) to (D) and (F).
<12>
<11> The W/O emulsion composition according to any one of <7> to <11>, which is an O1/W/O emulsion cosmetic in which an inner layer oil phase O1 is dispersed in the aqueous phase of a W/O emulsion composition, and the inner layer oil phase (O1) contains components (A) to (D) and (F).
<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
The O1/W/O type emulsion cosmetic composition is an O1/W/O type emulsion cosmetic composition in which an inner layer 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 layer 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,
The O1/W/O type emulsion cosmetic composition is an O1/W/O type emulsion cosmetic composition in which an inner layer 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 layer 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) Nonionic surfactants containing the following (e1) and (e2): (e1) one or more selected from 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,
The O1/W/O type emulsion cosmetic composition is an O1/W/O type emulsion cosmetic composition in which an inner layer 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 layer 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) Nonionic surfactants containing the following (e1) and (e2): (e1) one or more selected from 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,
The O1/W/O type emulsion cosmetic composition is an O1/W/O type emulsion cosmetic composition in which an inner layer 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 layer oil phase (O1).
＜17＞
The O1/W/O emulsion cosmetic composition according to any one of <13> to <16>, wherein 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.
＜18＞
The emulsion cosmetic composition according to any one of <13> to <16>, wherein 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.
＜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-acyl glutamic acids having 12 to 22 carbon atoms or salts thereof and N-alkyloyl methyl 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;
(F) a nonionic surfactant other than (e1) and (e2) having an HLB of 8 or more and 20 or less;
(G) containing one or more selected from inorganic acids and organic acids having 6 or less carbon atoms,
The O1/W/O type emulsion cosmetic composition is an O1/W/O type emulsion cosmetic composition in which an inner layer 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 layer oil phase (O1).
＜20＞
The following components (A), (B), (C), (D), (E), (F), and (G):
(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 the group consisting of N-acyl glutamic acids having 12 to 22 carbon atoms or salts thereof and N-alkyloyl methyl 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;
(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
The O1/W/O type emulsion cosmetic composition is an O1/W/O type emulsion cosmetic composition in which an inner layer 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 layer oil phase (O1).
＜21＞
The following components (A), (B), (C), (D), (E), (F), and (G):
(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) 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) containing one or more organic or inorganic acids selected from malic acid, lactic acid, citric acid, succinic acid, glutamic acid, adipic acid, and phosphoric acid;
The O1/W/O type emulsion cosmetic composition is an O1/W/O type emulsion cosmetic composition in which an inner layer 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 layer oil phase (O1).
<22>
The W/O type emulsion composition according to <21>, wherein the content of component (A) is 0.2 to 10% by mass, based on the total emulsion composition; the content of component (B) is 0.2 to 10% by mass, based on the total emulsion composition; the content of component (C) is 0.5 to 10% by mass, based on the total emulsion composition; the content of component (D) is 0.05 to 5% by mass, based on the total emulsion composition; the content of component (e1) is 0.1 to 10% by mass, based on the total emulsion composition; the content of component (e2) is 0.1 to 10% by mass, based on the total emulsion composition; the content of component (F) is 0.05 to 1% by mass, based on the total emulsion composition; and the content of component (G) is 0.01 to 2% by mass, based on the total emulsion composition.
＜23＞
The emulsion cosmetic composition according to any one of <19> to <21>, wherein 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.

(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 texture (richness and spreadability) using the methods described below. The results are also shown in Tables 1 to 4.

(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 layer 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 stirred and emulsified until uniform, thereby obtaining an O/W/O emulsion composition.

(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: Emulsified state is maintained for 15 days or more. B: Separates in 8 to 14 days. C: Separates in 4 to 7 days. D: Separates in 1 to 3 days. E: Separates in less than 1 day.

(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 evaluation was based on a five-point scale, with 5 being a rating of extremely rich, 4 being a rating of excellent rich, 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 evaluation was based on a five-point scale, with 5 being a rating of extremely excellent 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 poor stretchability that was deemed unsuitable for practical use.

The ingredients used in the table are as follows:
* 1: Sunsoft 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 Co., Ltd. * 10: Phytosphingosine, manufactured by Evonik Industries AG * 11: PURE L-GLUTAMIC ACID, manufactured 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 K-B, manufactured by Ichimaru Pharcos Co., Ltd. * 18: Silicone KF-96L-2CS, manufactured by Shin-Etsu Chemical Co., Ltd. * 19: Leopard KL2, manufactured by Chiba Flour Mills Co., Ltd. * 20: Emalex HC-5, manufactured by Nippon Emulsion Co., Ltd. * 21: Cosmetic concentrated glycerin, manufactured by Kao Corporation * 22: Emmanone CH-25, manufactured by Kao Corporation * 23: Emulgen 1620G, manufactured by Kao Corporation * 24: Emmanone 3199V, manufactured by Kao Corporation * 25: Rheodol 460V, manufactured by Kao Corporation * 26: Rheodol TW-S320V, manufactured by Kao Corporation * 27: Emalex HC-10, manufactured by Nippon Emulsion Co., Ltd.

(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 moist feeling, thickness upon application, skin protection feeling, lack of squeaky feeling upon application, and smooth skin feeling) 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.

(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 layer 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 stirred and emulsified until uniform, thereby obtaining an O/W/O emulsion composition.

(Evaluation method)
(High temperature stability)
(Emulsion stability (visual inspection))
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. △: Very slight separation is observed, but the emulsified state 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

(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 moist feeling)
The evaluation was based on a four-point scale, 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 felt at all and was judged to be unusable.
(Protecting the skin)
The evaluation was divided into four levels, with 4 being a rating for cases where it was judged that the product strongly protected the skin, 3 being a rating for cases where it was judged that the product slightly protected the skin, 2 being a rating for cases where it was judged that the product did not protect the skin at all and was judged to be unusable.
(No squeaking when applied)
The evaluation was divided into four levels, with 4 being a rating for cases where it was judged that no creaking was felt at all, 3 being a rating for cases where it was judged that creaking was felt slightly, 2 being a rating for cases where it was judged that creaking was felt but that it was usable, and 1 being a rating for cases where it was judged that creaking was felt very strongly and was very uncomfortable and that it was not practically usable.
(skin feels smooth)
The criteria were divided into four levels, with 4 being a rating for when it was judged that the skin felt very smooth, 3 being a rating for when it was judged that the skin felt slightly smooth, 2 being a rating for when it was judged that the skin felt somewhat smooth, and 1 being a rating for when it was judged that the skin felt no smoothness at all and was therefore unusable.

Claims (6)

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 types selected from crosslinked polyether-modified silicones and crosslinked polyglycerin-modified silicones; and (e2) 0.1% by mass or more and 10% by mass or less of one or more types selected from polyether-modified silicones, polyglycerin-modified silicones, and polyglycerin fatty acid esters, wherein the mass ratio of component (e1) to component (e2) ( e2 /e1) is 0.1 or more and 10 or less. 2. The O/ W/O emulsion composition according to claim 1, wherein the aqueous phase contains components (A) to (D). 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. 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. 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. 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.