JP7186520B2 - W/O emulsion composition - Google Patents

Description

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

Ceramides are one type of sphingolipids and exist in high concentrations in cell membranes. Ceramides are known to constitute a lipid barrier in the skin as a key component in interkeratinocyte lipids and play an important role in keeping the skin flexible and fresh, and are one of the means to improve rough skin. As one, it is an effective ingredient for external preparations for skin because it enhances the water retention capacity of the stratum corneum.

Since such ceramides are highly crystalline and difficult to be stably blended into an emulsifying system, an O/W emulsifying composition blended with ceramide and phospholipids is used as an oil blended with a silicone surfactant. O/W/O type emulsified cosmetics dispersed in the phase (Patent Document 1), ceramides are first made into an O/W emulsion, and then liquid oils and fats and a lipophilic emulsifier are blended into this to form an O/W/ A technique for making a double emulsified cosmetic composition comprising an O-type emulsion (Patent Document 2), a water-in-oil emulsion containing ceramide, an organically modified clay mineral, a diester of N-acylglutamic acid, and phytosterol. A skin external preparation (Patent Document 3) has been reported. Furthermore, an O/W/O type external preparation for skin containing ceramides and glycerin monofatty acid ester, higher alcohol, sphingosine salt or ionic surfactant has also been reported (Patent Document 4).

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

The O/W/O type external preparation for skin described in Patent Document 4 suppresses the crystallization of ceramides during low-temperature storage, has emulsion stability, and when applied to the skin, gives a protective feeling and smoothness to the skin. The feeling is also good.
By the way, the surface of the skin is kept weakly acidic as part of maintaining homeostasis. Therefore, in designing a low-irritant topical skin preparation, it is desirable to adjust the pH of the formulation to be close to that of the skin and weakly acidic. In addition, as the surfactant in the external preparation for skin, it is more desirable to use an anionic surfactant in consideration of application to users of a wide range of age groups and users with various skin types. However, when an anionic surfactant is used to stably emulsify and disperse ceramides, there is a problem that its surfactant ability is deactivated at weakly acidic to neutral pH.
Accordingly, an object of the present invention is to provide a W/O composition that contains ceramides, exhibits excellent emulsification stability during high-temperature storage even when an acidic compound is contained in the aqueous phase, and exhibits excellent usability when applied to the skin. An object of the present invention is to provide a type emulsion composition.

Therefore, the inventors of the present invention conducted various studies on the O/W/O type external skin preparation of Patent Document 4 containing ceramides, and found that an inorganic acid, an organic acid having 6 or less carbon atoms, and an anionic surfactant were blended. Furthermore, by containing a specific nonionic surfactant with an HLB of 8 or more, the W/O type has excellent emulsification stability during storage at high temperatures, and has an excellent feeling of use, such as a sustained moist feeling when applied to the skin. They found that an emulsified composition can be obtained, and completed the present invention.

Thus, the present invention provides the following components (A), (B), (C), (D), (E) and (F):
(A) a glycerin monofatty acid ester having 12 to 26 carbon atoms,
(B) a higher alcohol having 10 to 22 carbon atoms,
(C) ceramides,
(D) an anionic surfactant,
(E) a nonionic surfactant with an HLB of 8 or more,
(F) A W/O emulsion composition containing at least one selected from inorganic acids and organic acids having 6 or less carbon atoms.

The W/O emulsion composition of the present invention shows little change in viscosity even after being stored at a high temperature of 50°C or higher, exhibits excellent stability of the emulsified system, maintains a moist feeling, and provides a feeling of thickness at the time of application. The skin feels moisturizing, there is no squeaky feeling when applied, and the feeling of use is excellent, such as making the skin smooth.

The W/O emulsion composition of the present invention is a composition containing the following components (A) to (F).
(A) a glycerin monofatty acid ester having 12 to 26 carbon atoms,
(B) a higher alcohol having 10 to 22 carbon atoms,
(C) ceramides,
(D) an anionic surfactant,
(E) a nonionic surfactant with an HLB of 8 or more,
(F) one or more selected from inorganic acids and organic acids having 6 or less carbon atoms

(Component (A))
Component (A) is a glycerin mono fatty acid ester having 12 to 26 carbon atoms.
The number of carbon atoms in the component (A) is preferably 14 or more, more preferably 16 or more, and preferably 24 or less from the viewpoint of suppressing precipitation of the component (C) described below and giving a favorable feeling during use. and 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 monoarachidic acid ester, glycerin monolinoleic acid ester and the like can be mentioned. Among these, at least one selected from the group consisting of glycerin monobehenate, glycerin monostearate, and glycerin monopalmitate is preferable from the above-mentioned viewpoint, and glycerin monobehenate is more preferable.

In this embodiment, the component (A) can be used alone or in combination of two or more. In the present embodiment, the content of the component (A) in the emulsified composition is from the viewpoint of improving the emulsion stability of the emulsified composition, from the viewpoint of suppressing the squeaky feeling at the time of application, and from the viewpoint of enhancing the feeling of protecting the skin. From a viewpoint, 0.05 to 12% by mass is preferable with respect to the whole emulsion composition, 0.2 to 10% by mass is more preferable, 0.3 to 7% by mass is more preferable, and 0.4 to 4% by mass is Even more preferably, 0.45 to 2% by mass is particularly preferable, and 0.5 to 1.0% by mass is even more preferable.

(Component (B))
Component (B) is a higher alcohol having 10 to 22 carbon atoms.
The number of carbon atoms in the component (B) is preferably 14 or more, more preferably 16 or more, and preferably 20 or less from the viewpoint of suppressing the precipitation of the component (C) described below and giving a favorable feeling during use. and more preferably 18 or less.

In this embodiment, component (B) can be used alone or in combination of two or more. In the present embodiment, 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 more preferably one or more selected from cetyl alcohol and stearyl alcohol.

In the present embodiment, the content of the component (B) in the emulsion composition is, from the viewpoint of improving the emulsion stability of the emulsion composition, from the viewpoint of suppressing the stickiness at the time of application, and the thickness feeling at the time of application and the skin. From the viewpoint of enhancing the feeling of protection, it is preferably 0.05 to 15% by mass, more preferably 0.2 to 10% by mass, still more preferably 0.3 to 7% by mass, and 0.4 ~4% by weight is even more preferred, 0.45 to 2% by weight is particularly preferred, and 0.5 to 1.0% by weight is even more preferred.

Further, in the emulsion composition in the present embodiment, the total content of components (A) and (B), that is, the mass ratio represented by ((A) + (B)) is the emulsion stability of the emulsion composition is preferably 0.15 to 10% by mass, more preferably 0.4 to 8% by mass, and still more preferably 0.6 to 3% by mass, relative to the entire emulsion composition, from the viewpoint of improving the , Still more preferably 0.7 to 2.5% by mass, and particularly preferably 0.8 to 2.0% by mass.

Furthermore, the mass ratio of component (A) to component (B) ((A)/(B)) is 0.1 or more from the viewpoint of improving the feeling of thickness and feeling of protecting the skin when the emulsified composition is applied. is preferably 0.4 or more, more preferably 0.6 or more, and from the viewpoint of improving the feeling of protecting the skin and reducing the squeaky feeling at the time of application, it is preferably 5 or less, and 3.0 or less. is more preferable, and 2.5 or less is even more preferable.

(Component (C))
Component (C) is ceramides, and one or more selected from natural ceramides and pseudo-ceramides can be used. Specifically, ceramides described in JP-A-2013-53146 are used. can.

Specific examples of natural ceramides include Ceramide Types 1 to 7 in which sphingosine, dihydrosphingosine, phytosphingosine or sphingadienin is amidated (for example, J. Lipid Res., 24:759 (1983), FIG. 2; and porcine and human ceramides as described in Figure 4 of J. Lipid. Res., 35:2069 (1994).

Furthermore, N-alkyl forms (eg, N-methyl forms) of these are also included.
These ceramides can be used as natural (D(-) form) optically active forms, as non-natural (L(+) form) optically active forms, or as mixtures of natural and non-natural forms. may be used. The relative configuration of the above compounds may be a natural configuration, a non-natural configuration, or a mixture thereof. Among them, the compounds of CERAMIDE1, CERAMIDE2, CERAMIDE3, CERAMIDE5 and CERAMIDE6II (both INCI, 8th Edition) and those represented by the following formulas 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, Ceramide VI (manufactured by Cosmo Farm 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) and CERAMIDE2 (manufactured by Sederma).

Pseudo-type ceramides include those represented by the following general formula (5).

(In general formula (5) above, 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 having 5 to 22 carbon atoms which may be substituted with a hydroxyl group or an amino group; or a hydrocarbon group in which a linear or branched, saturated or unsaturated fatty acid having 8 to 22 carbon atoms, which may be substituted with a hydroxyl group, is ester-bonded to the ω end of the hydrocarbon group; R ²⁷ represents a hydrogen atom or an alkyl group having 1 to 30 carbon atoms in total which may be substituted with a hydroxyl group, a hydroxyalkoxy group, an alkoxy group or an acetoxy group.)

R ²⁶ includes a nonyl group, a tridecyl group, a pentadecyl group, an undecyl group in which linoleic acid is ester-bonded at the ω-position, a pentadecyl group in which linoleic acid is ester-bonded at the ω-position, and a 12-hydroxystearic acid ester-bond at the ω-position. A pentadecyl group and an undecyl group in which a methyl-branched isostearic acid is amide-bonded at the ω-position are particularly preferred.

When R ²⁵ is a hydrogen atom, R ²⁷ is an alkyl group having 10 to 30 carbon atoms in total, preferably 12 to 20 carbon atoms in total, which may be substituted with a hydroxyl group, a hydroxyalkoxy group, an alkoxy group or an acetoxy group. Yes; 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 represents a hydrogen atom or hydroxyl preferably represents an alkyl group having a total of 1 to 8 carbon atoms which may be substituted by a group, a hydroxyalkoxy group, an alkoxy group or an acetoxy group. The hydroxyalkoxy group or alkoxy group for R ²⁷ preferably has 1 to 7 carbon atoms.
Specific examples of the compound represented by the general formula (5) include those represented by the following formulas.

Those represented by the general formula (5) include 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; R ²⁵ is a hexadecyl group, and X ¹⁹ is hydrogen A pseudo-ceramide ^having an atom, ^{R 26} is ^{a nonyl group, and R 27 is} a hydroxyethyl group ^is preferred. Those with ethyl groups (N-(hexadecyloxyhydroxypropyl)-N-hydroxyethylhexadecanamide) are more preferred. Moreover, what is represented by the following formula is also preferable.

In the present embodiment, the content of component (C) in the emulsion composition is 0.05 with respect to the entire emulsion composition from the viewpoint of improving the stability of the emulsion composition and reducing stickiness during application. ~15 wt% is preferred, 0.1 to 13 wt% is more preferred, 0.5 to 10 wt% is even more preferred, and 0.8 to 5 wt% is even more preferred.

Further, in the components (A), (B) and (C), the mass ratio of the component (C) to the total of the components (A), (B) and (C), that is, ((C) / ((A) + The mass ratio represented by (B)+(C))) is preferably 0.4 or more, more preferably 0.45 or more, from the viewpoint of improving the emulsion stability and feeling of use of the emulsion composition at low temperatures. , more preferably 0.5 or more, even more preferably 0.52 or more, and most preferably 0.55 or more. In addition, from the viewpoint of suppressing precipitation of component (C) during low-temperature storage, the mass ratio represented by ((C)/((A)+(B)+(C))) is preferably less than 1.0. , more preferably 0.95 or less, more preferably 0.9 or less, still more preferably 0.85 or less, and even more preferably 0.8 or less.

In addition, from the viewpoint of improving the emulsion stability and feeling of use of the emulsion composition at low temperatures, and from the viewpoint of suppressing precipitation of the component (C) during low-temperature storage, ((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 one or more compounds selected from anionic surfactants.

Examples of component (D) anionic surfactants include fatty acids having 12 to 22 carbon atoms such as sodium laurate, potassium palmitate, and arginine stearate, or salts thereof; sodium lauryl sulfate, potassium lauryl sulfate, and sodium cetyl sulfate. Alkyl sulfate esters having 12 to 22 carbon atoms such as or salts thereof;
C 12-22 alkyl ether sulfates such as polyoxyethylene lauryl sulfate triethanolamine or salts thereof;
C 12-22 alkyl ether acetates such as sodium polyoxyethylene tridecyl ether acetate or salts thereof;
N-C 12-22 acyl sarcosine such as sodium lauroyl sarcosine or a salt thereof;
C 12-22 alkyl phosphates such as sodium monostearyl phosphate or salts thereof;
Polyoxyethylene C 12-22 alkyl ether phosphates such as sodium polyoxyethylene oleyl ether phosphate and sodium polyoxyethylene stearyl ether phosphate or salts thereof;
Dialkylsulfosuccinic acid having 12 to 24 carbon atoms such as sodium di-2-ethylhexylsulfosuccinate or a salt thereof;
N-alkyloylmethyltaurine having 12 to 22 carbon atoms such as sodium N-stearoyl-N-methyltaurate or a salt thereof;
C 12-22 acylglycines such as sodium N-coconut fatty acid acylglycine or salts thereof;
C12-22 acyl alanine such as sodium N-coconut fatty acid acyl alanine or a salt thereof; or sodium dilauroyl glutamate, monosodium N-lauroyl glutamate, sodium N-stearoyl-L-glutamate, N-stearoyl-L- Acylglutamic acids having 12 to 22 N-carbon atoms such as arginine glutamate, sodium N-stearoylglutamate, sodium N-myristoyl-L-glutamate and salts thereof can be mentioned.
From the viewpoint of improving the emulsification stability of the external skin preparation, component (D) is preferably other than fatty acids or salts thereof. One or two or more selected from N-alkyloylmethyl taurine salts of 1 to 22 and N-acyl glutamates having 12 to 22 carbon atoms are preferable, and from the viewpoint of obtaining a preferable feeling in use, N-acyl having 12 to 22 carbon atoms One or two selected from the group consisting of glutamic acid or its salts and N-alkyloylmethyl taurate salts having 12 to 22 carbon atoms are more preferable. As the N-C12-C22 acylglutamate, N-stearoyl-L-glutamate is preferable, and N-stearoyl-L-glutamic acid arginine salt and N-stearoyl-L-glutamic acid potassium salt are more preferable. As the C 12-22 N-alkyloylmethyl taurate salt, sodium N-alkyloylmethyl taurate having 12-22 carbon atoms is used from the viewpoint of improving the emulsification stability of the external preparation for skin and obtaining a favorable feeling during use. Preferred are N-alkyloylmethyl taurate salts having 14 to 20 carbon atoms, and more preferred are N-alkyloylmethyl taurate salts having 16 to 20 carbon atoms.

From the viewpoint of suppressing the precipitation of the component (C) and from the viewpoint of improving the emulsion stability of the emulsion composition, the component (D) is an acyl methyl taurate, an acyl glutamate, an acyl aspartate, a fatty acid salt, It preferably contains one or more selected from the group consisting of diacylglutamic acid lysine salts and acylarginine salts.

Component (D) can be used singly or in combination of two or more.
The content of component (D) is, for example, 0 with respect to the entire emulsified composition, from the viewpoint of stably dispersing each component described later, obtaining a non-sticky feeling in use, and suppressing a squeaky feeling during application. 0.01 to 10% by mass, preferably 0.05 to 5% by mass, more preferably 0.1 to 3% by mass, and even more preferably 0.4 to 2% by mass.

In components (A), (B), (C) and (D), the mass ratio of component (D) to the sum of components (A), (B) and (C), that is, ((D)/((A ) + (B) + (C))) improves the emulsification stability of the emulsified composition at low temperatures, the viewpoint of suppressing the precipitation of component (C) during low-temperature storage, and the feeling of use. From the viewpoint of increasing the In addition, from the viewpoint of improving the balance between the emulsion stability of the emulsion composition at low temperatures and the feeling of use, the mass ratio represented by ((D) / ((A) + (B) + (C))) is , preferably 0.5 or less, more preferably 0.4 or less, still more preferably 0.35 or less, and even more preferably 0.30 or less.

Further, in the emulsified composition of the present embodiment, the total content of components (A) to (D), that is, the mass ratio represented by ((A) + (B) + (C) + (D)) is , From the viewpoint of improving the stability of the emulsion composition at low temperatures, it is preferably 0.3 to 15% by mass, more preferably 0.5 to 12% by mass, and still more preferably is 1 to 10% by mass, more preferably 2 to 8% by mass, and particularly preferably 3.5 to 7% by mass.

(Component (E))
Component (E) is a nonionic surfactant with an HLB of 8 or higher. In the present invention, when a nonionic surfactant having an HLB of less than 8 is used, the emulsion stability of a composition containing an acidic compound in the aqueous phase cannot be maintained under high temperature conditions, resulting in separation, thickening, and gelling. Feeling of use is impaired due to deterioration.
From the viewpoint of improving high-temperature emulsion stability and high-temperature viscosity stability, the HLB of the nonionic surfactant is preferably 8 or more and 20 or less, more preferably 10 or more and 20 or less, further preferably 12 or more and 20 or less, and 14 or more. 20 or less is even more preferred.
Here, HLB (hydrophilic-lipophilic balance) can be obtained, for example, by the following formula.

Formula: [HLB] = 7 + 1.171 log (Mw / Mo)
(Wherein, Mw is the molecular weight of the hydrophilic group of the surfactant, Mo is the molecular weight of the hydrophobic group of the surfactant, and log is the base 10 logarithm.)

Nonionic surfactants with an HLB of 8 or more include 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, One or more selected from polyoxyethylene sorbitol fatty acid esters, polyglycerin fatty acid esters, polyoxyethylene polyoxypropylene alkyl ethers, sucrose fatty acid esters and the like are preferred. Among these, one or more selected from polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, and polyoxyethylene fatty acid ester are more preferable.

In this embodiment, component (E) can be used alone or in combination of two or more. In the present embodiment, the content of component (E) is preferably 0.05 to 1% by mass, more preferably 0.1 to 1% by mass, from the viewpoint of emulsion stability at high temperatures and viscosity stability at high temperatures. 0.15 to 0.8% by mass is more preferable, and 0.2 to 0.7% by mass is even more preferable.

Component (F) is an inorganic acid and an organic acid having 6 or less carbon atoms. By blending the organic acid in the aqueous phase, the feeling of use is improved while maintaining the homeostasis of the skin surface.
As the organic acid, a water-soluble organic acid is preferable, and examples thereof include fatty acids having 1 to 6 carbon atoms, hydroxy acids, dicarboxylic acids, acidic amino acids, and the like. Among these, more preferably one or more selected from malic acid, lactic acid, citric acid, succinic acid, acetic acid, tartaric acid, glutamic acid, aspartic acid, adipic acid, etc. Malic acid, lactic acid, citric acid, succinic acid, etc. One or two or more selected from are more preferable.
Further, the inorganic acid is preferably one or more selected from hydrochloric acid, nitric acid, nitrous acid, sulfuric acid, sulfurous acid, phosphoric acid, phosphonic acid, phosphinic acid and the like, and one or more selected from phosphoric acid. more preferred.

In this embodiment, component (F) can be used alone or in combination of two or more. In this embodiment, the content of the component (F) is 0.01 to 2% by mass from the viewpoint of improving the feeling of use while maintaining good high-temperature stability of the emulsified composition and maintaining the homeostasis of the skin surface. is preferred, 0.02 to 1% by mass is more preferred, 0.05 to 1% by mass is even more preferred, and 0.05 to 0.8% by mass is even more preferred.

The mass ratio (E/F) of the component (E) to the component (F) is preferably 0.3 or more and 6.0 or less, and 0.7, from the viewpoint of improving emulsion stability and high temperature viscosity stability at high temperatures. 5.5 or less is more preferable, and 1.0 or more and 5.0 or less is still more preferable.

The mass ratio (E/A) of the component (E) to the component (A) is preferably 0.1 or more and 1.5 or less from the viewpoint of improving the stability of the emulsified composition at low and high temperatures. .2 or more and 1.3 or less is more preferable.

The emulsion composition in the present embodiment is a W/O type emulsion composition containing the above components (A) to (F), and components (A) to ( F) is preferably included, and it is more preferable to be an O1/W/O emulsified cosmetic in which the inner layer oil phase O1 is dispersed in the water phase of the W/O emulsified composition.
Further, more specifically, the internal phase of the emulsified composition in the present embodiment has a lamellar α-gel structure. The external preparation for skin according to the present embodiment is excellent in the feeling of use, especially in the longevity of moist feeling. It is speculated that this is because the synergistic action with the phase allows the oil agent to remain on the skin surface as a lamellar coating for a long period of time.
Therefore, in the present embodiment, the ceramides are stably blended by suppressing the crystallization of the ceramides during low-temperature storage, and the components (A) to (E ) in the inner oil phase (O1).

From the viewpoint of improving storage stability under temperature cycle conditions, the emulsion composition in the present embodiment further includes (G1) one or more selected from crosslinked polyether-modified silicone and crosslinked polyglycerin-modified silicone, (G2) It preferably contains one or more selected from polyether-modified silicone, polyglycerin-modified silicone and polyglycerin fatty acid ester.

(G1) Crosslinked polyether-modified silicone is a three-dimensional crosslinked product in which an organopolysiloxane chain is crosslinked with polyether, and is represented by the following general formula (3):

(In the formula, each R ¹⁰ represents a methyl group or a phenyl group, each R′ represents a hydrogen atom, an alkyl group having 1 to 30 carbon atoms or an acyl group, and each R″ represents an alkyl group having 1 to 30 carbon atoms. or an acyl group, or a siloxane group having 1 to 30 silicon atoms, d represents a number from 1 to 20, e and f represent numbers from 0 to 200, and e and f are not 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, k represents a number from 1 to 1000)
A crosslinked polyether-modified silicone represented by is mentioned.

In the general formula (1), R "is preferably an alkyl group having 1 to 15 carbon atoms. In addition, 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 from 1 to 50 and k is preferably a number from 1 to 50.

(G1) The crosslinked polyether-modified silicone can be produced, for example, by the method described in JP-A-4-272932.
Moreover, (G1) the crosslinked polyether-modified silicone is preferably diluted or dispersed in a volatile hydrocarbon oil or silicone oil. As the volatile hydrocarbon oil, isododecane and polyisobutene are more preferable.

Examples of (G1) crosslinked polyether-modified silicone include KSG-210, KSG-240 (dimethicone/(PEG-10/15)) crosspolymer); KSG-310, KSG-320, KSG-330 ((PEG -15 / Lauryl Dimethicone) Crosspolymer); can be used.
One or more of these crosslinked polyether-modified silicones can be used.

(G1) Crosslinked polyglycerin-modified silicone is a three-dimensional crosslinked product in which an organopolysiloxane chain is crosslinked with polyglycerin. (Lauryl dimethicone/polyglycerin-3) crosspolymer, etc., for example, KSG-710 (dimethicone/polyglycerin-3) crosspolymer), KSG-810 (lauryl dimethicone/polyglycerin-3) crosspolymer) (above , manufactured by Shin-Etsu Chemical Co., Ltd.) can be used.
One or more of these crosslinked polyglycerin-modified silicones can be used.

The content of the component (G1) is preferably 0.1% by mass or more and 10% by mass or less based on the entire emulsion composition, from the viewpoint of storage stability under temperature cycle conditions and feeling during use, and is preferably 0.5% by mass. % or more and 2 mass % or less is more preferable, and 0.75 mass % or more and 1.25 mass % or less is even more preferable.
As the component (G1), it is more preferable to use a crosslinked polyether-modified silicone from the viewpoint of storage stability under temperature cycle conditions and feeling in use.

Among components (G2), the polyether-modified silicone refers to a silicone having a monovalent polyoxyalkyl group in its structure, and includes, for example, 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 having 1 to 30 carbon atoms or an acyl group, and R ¹² represents a carbon an alkyl or acyl group of number 1 to 30, or a siloxane group of silicon atoms 1 to 30, d represents a number of 1 to 20, e and f represent a number of 0 to 200, and e and f are simultaneously never 0. g represents a number of 10 to 2000, h represents a number of 1 to 1000. Preferably, in the general formula (4), d is 1 to 10, e is 1 to 50, f is a number from 1 to 50, g is from 10 to 1000, and h is from 1 to 50.)

Polyether-modified silicones of component (G2) include, for example, PEG-3 dimethicone, PEG-10 dimethicone, PEG-11 methyl ether dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, cetyl PEG/PPG-10/1 dimethicone , and the like. is mentioned. Commercially available products include KF-6015, KF-6017, KF-6025, KF-6028, and KF-6048 (manufactured by Shin-Etsu Chemical Co., Ltd.).
Among components (G2), polyglycerin-modified silicone refers to a silicone having a monovalent polyglyceryl group in its structure, and examples thereof include polyglyceryl-3 disiloxane dimethicone and polyglyceryl-3 polydimethylsiloxyethyl dimethicone. Commercially available products include KF-6100 and KF-6104 (manufactured by Shin-Etsu Chemical Co., Ltd.).
One or more of these components (G2) can be used.

Among the components (G2), polyglycerin fatty acid esters include diglycerin fatty acid esters, triglycerin fatty acid esters, and the like. Esters are preferred. In addition, from the same viewpoint, the polyglycerin 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 a saturated fatty acid-derived polyglycerin fatty acid ester. preferable.
As the component (G2), it is more preferable to use a polyether-modified silicone and/or a polyglycerin fatty acid ester from the viewpoint of storage stability under temperature cycle conditions and feeling in use.
One or more of these components (G2) can be used.

The content of the component (G2) is preferably 0.1% by mass or more and 10% by mass or less based on the entire emulsion composition, from the viewpoint of storage stability under temperature cycle conditions and feeling during use, and is 2.5% by mass. % or more and 5 mass % or less is more preferable, and 3 mass % or more and 4 mass % or less is even more preferable.

When both the component (G1) and the component (G2) are used together, the content mass ratio (G2/G1) of the component (G1) and the component (G2) is determined from the viewpoint of storage stability under temperature cycle conditions and feeling during use. Therefore, it is preferably 0.1 or more and 8 or less, more preferably 1 or more and 5 or less, and still more preferably 3 or more and 4 or less.

In addition to the above components, the emulsified composition of the present invention contains water, an oily component (H) other than the component (B), a thickener or gel substance, amino acids, a plant extract, a moisturizer, an anti-inflammatory agent, Preservatives and the like can be contained.
Examples of the oil component (H) include those used in ordinary cosmetics, such as liquid paraffin, squalane, vaseline, ceresin, and other hydrocarbon oils; ), ether oils such as ethylene glycol dioctyl ether, glycerol monooleyl ether; octyldodecyl myristate, isopropyl palmitate, butyl stearate, di-2-ethylhexyl adipate, neopentyl glycol dicaprate, trioctanoin, isononanoic acid ester oils such as isotridecyl; 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; Fluorinated oils such as fluoroalkylethyl phosphate, perfluoroalkylpolyoxyethylene phosphate, perfluoropolyether, and polytetrafluoroethylene are included. Ester oil and the like may be derived from naturally-derived oils such as plants.

Among these, from the viewpoint of improving the feeling of use without a squeaky feeling, the oily component (H) contained in the outer layer oil phase preferably contains an oil that is liquid at 25°C. The liquid oil is preferably hydrocarbon oil or silicone oil, more preferably both.
From the same point of view, the mass ratio of hydrocarbon oil to silicone oil (hydrocarbon oil/silicone oil) is preferably 9/1 to 1/1, more preferably 7/1 to 1.5/1, and 5/1. ~2/1 is more preferred.
Furthermore, a polar oil having an IOB value of 0.1 or more can be used as the oily component (H) contained in the outer layer oil phase, but the content thereof is It is preferably 40% by mass or less, more preferably 20% by mass or less, even more preferably 1% by mass or less, and most preferably does not contain a polar oil having an IOB value of 0.1 or more.

Amino acids include neutral amino acids such as glycine, serine, cystine, alanine, threonine, cysteine, valine, phenylalanine, methionine, leucine, tyrosine, proline, isoleucine, tryptophan, and hydroxyproline; aspartic acid, asparagine, glutamine, acidic amino acids such as glutamic acid; basic amino acids such as arginine, histidine, and lysine; and betaine and amino acid derivatives such as acylsarcosine and its salts, acylglutamic acid and its salts, acyl-β-alanine and its salts, glutathione, and pyrrolidone carboxylic acid. and salts thereof, oligopeptides such as glutatin, carnosine, gramcigin S, tyrosidine A and tyrosidine B, guanidine derivatives and salts thereof described in JP-A-6-228023.

When these amino acids are contained, the content is preferably about 0.001 to 3% by mass with respect to the entire emulsified composition.

Plant extracts include, for example, Angelica keiskei, adzuki beans, avocado, amacha, amachatsuru, arteca, arnica, almond, aloe, apricot, nettle, iris, fennel, turmeric, ageitsu, scutellaria root, barley, coptis, barley, okra, hypericum, dead nettle , Ononis, Dutch mustard, oyster, kakkon, valerian, birch, cattail, chamomile, chamomilla, oat, licorice, raspberry, kiwi, cucumber, kiwi, kukui nut, gardenia, kumazasa, walnut, cinnamon bark, mulberry, gunjo, gentian, gennoshoko, Burdock, sesame, wheat, rice, sasanqua, saffron, hawthorn, Japanese pepper, shiitake mushroom, rhododendron, rhododendron, perilla, linden, meadowsweet, peony, ginger, calamus, birch, honeysuckle, horsetail, stevia, ivy, hawthorn, Elderberry, juniper, yarrow, mint, sage, mallow, cnidium, japonica, soybean, daisou, dime, tea, clove, chimp, evening primrose, camellia, centella asiatica, walnut, angelica, calendula, tonin, spruce, corn, Houttuynia cordata, tomato, carrot, garlic, wild rose, tapir, parsley, naked barley, pearl barley, mint, papaya, hamamelis, rose, cypress, sunflower, loquat, coltsfoot, grape, placenta, hazelnut, loofah, safflower, bodaiju, button, hop, Macadamia nut, pine, horse chestnut, melissa, melilot, peach, sprout, cornflower, palm, eucalyptus, saxifrage, lily, coix seed, mugwort, rye, groundnut, lavender, apple, litchi, lettuce, lemon, astragalus, rosemary, roma Examples include extracts obtained by conventional methods from plants such as chamomile, agrimonger, cattle, asunaro, holtso, cypress, pheasant, senki, chickweed, duckweed, wormwood, ginkgo, bellflower, chrysanthemum, bamboo grass, soapberry, and forsythia. Among these, extracts obtained from hamamelis, botan, agrimony, cattle, asunaro, holtsoe, cypress or pheasant are preferred.

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

Moisturizing agents include polyhydric alcohols having moisturizing action such as glycol, glycerin, glucose, maltose, maltitol, sucrose, fructose, xylitol, sorbitol, maltotriose, threitol, erythritol, starch-decomposing sugar reducing alcohol, sorbitol, etc. ; ethylene glycol, 1,4-butylene glycol, diglycerin, triglycerin, tetraglycerin, 1,3-butylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol, 1,3-propanediol and the like.
Polyoxyethylene methylglucosides such as methylgluceth-10 and methylgluceth-20, and polyoxypropylene methylglucosides such as PPG-20 methylglucose ester may also be used.

When these moisturizing agents are contained, the content thereof is preferably about 0.01 to 30% by mass with respect to the entire emulsified composition.

Anti-inflammatory agents include glycyrrhizic acid and its salts, glycyrrhetinic acid and its salts, epsilon aminocaproic acid and its salts, allantoin, lysozyme chloride, guaiazulene, methyl salicylate, γ-oryzanol and the like. More preferably, one or more selected from the group consisting of stearyl glycyrrhetinate and epsilon aminocaproic acid.

When these anti-inflammatory agents are contained, their content is preferably about 0.001 to 2% by mass with respect to the entire emulsified composition.

Examples of antiseptics include paraoxybenzoic acid esters (parabens) such as methylparaben, dehydroacetic acid and salts thereof.
Furthermore, thickening agents such as distearyldimonium hectorite and dextrin palmitate may be used as other components.

The emulsified composition of the present invention contains components (A) to (E) in the aqueous phase of the W/O type emulsified composition, from the viewpoint of improving the protective feeling and smoothness of the skin when applied to the skin. It is preferably an O1/W/O type emulsified composition in which the inner layer oil phase O1 is dispersed.
The external preparation for skin can contain components other than components (A) to (E), such as known components, in the inner oil phase O1 within the range that does not impair the effects of the present invention. In addition, from the viewpoint of suppressing crystallization of ceramides during low-temperature storage and stably blending ceramides, the content of solid fats other than (A) to (E) is 1% by mass in the emulsified composition. The following is preferable, 0.5% by mass or less is preferable, 0.1% by mass or less is more preferable, and substantially 0% by mass is preferable.

Further, the ratio of the inner layer oil phase O1 in the O1/W/O type emulsion composition is preferably 0.1 to 15% by mass relative to the entire emulsion composition from the viewpoint of improving the emulsion stability of the emulsion composition. , more preferably 0.5 to 12% by mass, still more preferably 1 to 10% by mass, even more preferably 2 to 8% by mass, even more preferably 3.5 to 7% by mass be.

Next, the water phase in the W/O emulsion composition will be explained.
The ratio of the aqueous phase W in the emulsified composition excludes the outer layer oil phase O (the sum of the outer layer oil phase O and the inner layer oil phase O1 in the case of an O1/W/O type emulsion composition) from the emulsified composition. From the viewpoint of improving the emulsion stability of the emulsified composition, the balance is preferably 30 to 90% by mass, more preferably 50 to 85% by mass, based on the entire emulsified composition.
The aqueous phase W specifically contains mainly water. The water content in the emulsified composition is preferably 30 to 90% by mass, more preferably 45 to 85% by mass, based on the total emulsified composition. Also, the content of water in the emulsified composition can be the balance after removing components other than water contained in the emulsified composition.
In addition, the aqueous phase may contain components other than water, specifically water-soluble components among optional components or other components described later.

Next, the outer layer oil phase O in the O1/W/O type emulsified composition will be described.
The proportion of the outer oil phase in the emulsified composition is preferably 5 to 40% by mass, more preferably 10 to 38% by mass, from the viewpoint of improving the emulsification stability of the emulsified composition and improving the feeling of use without creaking. %, more preferably 15 to 36 mass %, still more preferably 20 to 30 mass %.

Further, in the present embodiment, the ratio of the total mass of the inner layer oil phase and the aqueous phase to the mass of the outer layer oil phase in the O1/W/O emulsion composition is the mass represented by ((O1+W)/O The ratio is preferably 1 to 19, more preferably 1.5 to 10, still more preferably 2 to 5, from the viewpoint of improving the emulsion stability of the emulsion composition.
Further, in the present embodiment, the total mass ratio of the inner oil phase and the outer oil phase in the O1/W/O emulsion composition, that is, the mass ratio represented by (O1+O) with respect to the entire emulsion composition is From the viewpoint of improving the emulsion stability of the composition, (O1+O)/(O1+W+O) is preferably from 0.05 to 0.5, more preferably from 0.1 to 0.45, and still more preferably 0.5. 15 to 0.4.

Next, a method for producing an emulsified composition according to the present embodiment will be described.
For example, a known production method can be used to produce the W/O emulsion composition and the O1/W/O emulsion composition in the present embodiment. When producing an O1/W/O type emulsified composition, a two-stage emulsification method is particularly preferable, and the components of the outer layer oil phase are dissolved, swollen or dispersed in an oil agent prepared in advance by a conventional method. By re-emulsifying the internal phase O1/W emulsion composition, a milky white or transparent to translucent O1/W/O emulsion composition can be obtained.

The emulsified composition obtained by this embodiment can be in various forms, for example creams such as milky lotions, hair creams and hand creams, emulsified foundations and cosmetics such as beauty essences.
In addition, the emulsified composition of the present embodiment can be used by applying it to the skin, particularly the skin excluding the hair, preferably the face, body, limbs, and the like. Moreover, the emulsified composition of the present embodiment can also be used for the scalp and hair.

Although the embodiments of the present invention have been described above, these are examples of the present invention, and various configurations other than those described above can also be adopted.

(Examples 1-11 and Comparative Examples 1-6)
Emulsified compositions having the compositions shown in Tables 1 to 4 were produced, and the high temperature stability (60 ° C.) and feeling of use (continuous moist feeling, feeling of thickness at the time of application, feeling of protecting the skin, The absence of squeaky feeling at the time of application, the feeling of smoothness of the skin) was evaluated. The results are also shown in Tables 1 to 4.

(Production method)
An emulsified composition of each example was produced according to the following procedure.
(1) Components (A) to (E) and a polyhydric alcohol were uniformly mixed and dissolved at 80°C.
(2) Water and other aqueous phase components were uniformly mixed and dissolved at 80°C.
(3) The mixture obtained in (2) was added to the mixture obtained in (1) to prepare an O/W emulsified composition by a phase inversion emulsification method, and then allowed to cool to room temperature (25°C). .
(4) The outer layer oil phase components were uniformly mixed at room temperature (25°C).
(5) The emulsified composition obtained in (3) was added to the mixture obtained in (4), and the mixture was stirred and emulsified until uniform to obtain an O/W/O type emulsified composition.

(Evaluation method)
(High temperature stability)
(Emulsion stability (visual observation))
40 g of each emulsified composition was placed in a polypropylene container and stored at 60° C. for 10 days.
○: Emulsified state is maintained △: Separation is observed very slightly, but the emulsified state is maintained as a whole ×: Separation is observed (viscosity stability)
For each emulsion composition, the viscosity before storage and after storage at 60 ° C. was measured with a B8R viscometer (rotor No. TC, 5 rpm, 60 seconds), and the viscosity ratio before and after storage (after storage / before storage) Shown on the basis of the following criteria.
○: Less than 1.5 times △: 1.5 times or more and less than 3 times ×: 3 times or more

(feeling of use)
When the cosmetic composition comprising the emulsified composition obtained in each example was applied to the inner part of the forearm, the feeling of use included a moist feeling, a feeling of thickness when applied, a feeling of protecting the skin, no squeaky feeling when applied, Also, the feeling of smoothness of the skin was evaluated. Each item was individually evaluated according to the following criteria, and the final evaluation was determined after discussion.
(sustained moist feeling)
The criteria were divided into 4 grades, 4 when it was judged that the moist feeling was felt very much, and 1 when it was judged that the moist feeling was not felt at all and it was judged that it could not be actually used.
(Thickness when applied)
The criteria were divided into 4 grades, 4 when it was judged that the feeling of thickness was very felt, and 1 when it was judged that the feeling of thickness was not felt at all and it was judged that actual use was impossible.
(feels like it protects the skin)
The product was divided into 4 grades, and 4 was given when it was judged that the feeling of protecting the skin was very strong, and 1 was given when it was judged that the product could not be actually used because the feeling of protecting the skin was not felt at all.
(Lack of creaking during application)
The criteria were divided into 4 grades, and 4 was given when it was judged that no squeak was felt at all, and 1 was given when it was judged that the squeak was very unpleasant and could not be actually used.
(skin feels smooth)
The criteria were divided into 4 grades, and 4 was given when it was judged that the skin felt very smooth, and 1 was given when it was judged that the skin did not feel smooth and could not be used in practice.

The components used in the table are as follows.
*1: Sunsoft NO.8100, manufactured by Taiyo Kagaku *2: Cetyl Alcohol NX, manufactured by KOKYU ALCOHOL KOGYO *3: Softcare SL-E, manufactured by Kao *4: Nikkor SMT, manufactured by Nikko Chemicals *5: Emanone CH-60, manufactured by Kao *6: Emarex HC-5, manufactured by Nippon Emulsion *7: Concentrated glycerin for cosmetics, manufactured by Kao *8: Pearlream EX, manufactured by NOF *9: KSG-210, Shin-Etsu Manufactured by Kagaku Kogyo Co., Ltd. (effective content: 24%)
*10: Cosmol 42V, manufactured by Nisshin Oilio Group *11: Rheopearl KL2, manufactured by Chiba Flour Milling Co., Ltd. *12: Emanone CH-25, manufactured by Kao *13: Silicone KF-6017, manufactured by Shin-Etsu Chemical Co., Ltd. *14: Emulgen 1620G, manufactured by Kao *15: Emanone 3199V, manufactured by Kao *16: Rheodor 460V, manufactured by Kao *17: Rheodor TW-S320V, manufactured by Kao *18: Emarex HC-10, manufactured by Nippon Emulsion *19: Eucalyptus extract K, manufactured by Koei Kogyo Co., Ltd. *20: Asuna Liquid KB, manufactured by Ichimaru Farcos *21: Silicone KF-96L-2CS, manufactured by Shin-Etsu Chemical Co., Ltd.

Claims (7)

The following components (A), (B), (C), (D), (E) and (F):
(A) a glycerin monofatty acid ester having 12 to 26 carbon atoms,
(B) a higher alcohol having 10 to 22 carbon atoms,
(C) ceramides,
(D) an anionic surfactant,
(E) a nonionic surfactant with an HLB of 8 or more,
(F) A W/O emulsion composition containing at least one selected from inorganic acids and organic acids having 6 or less carbon atoms. 2. The W/O emulsion composition according to claim 1, wherein the mass ratio (E/F) of component (E) to component (F) is 0.3 or more and 6.0 or less. 3. The W/O emulsion composition according to claim 1, wherein the mass ratio (E/A) of component (E) to component (A) is 0.1 or more and 1.5 or less. (G1) one or more selected from crosslinked polyether-modified silicone and crosslinked polyglycerin-modified silicone; and (G2) one or more selected from polyether-modified silicone, polyglycerin-modified silicone and polyglycerol fatty acid ester. The W/O emulsion composition according to any one of claims 1 to 3. The W/O emulsion composition according to any one of claims 1 to 4, wherein the water phase contains components (A) to (F). The W/O emulsion composition according to any one of claims 1 to 5, wherein component (E) is a nonionic surfactant having an HLB of 10 or more. The W/O emulsion composition according to any one of claims 1 to 6, wherein component (F) is one or more selected from inorganic acids, fatty acids having 6 or less carbon atoms, hydroxy acids and dicarboxylic acids.