阅读说明：本技术 油包水型乳化组合物 (Water-in-oil type emulsified composition ) 是由 对间秀利 于 2018-05-30 设计创作，主要内容包括：本发明提供一种涂布膜的锁水性高且肌肤保护感和光泽感良好的油包水型乳化组合物。该油包水型乳化组合物含有下述成分(A)、(B)、(C)、(D)、(E)和(F)：(A)熔点为50～150℃的油性成分：1质量％以上且30质量％以下；(B)聚甘油脂肪酸酯：0.5质量％以上且8质量％以下；(C)成分(B)以外的HLB为2～6的亲油性表面活性剂；(D)脂肪酸部分的碳原子数为8～22的糊精脂肪酸酯：0.15质量％以上且8质量％以下；(E)在25℃呈液状的烃油；(F)水。(The invention provides a water-in-oil type emulsion composition with a coating film having high water-locking property and good skin protection feeling and gloss feeling. The water-in-oil emulsion composition comprises the following components (A), (B), (C), (D), (E) and (F): (A) oily components with a melting point of 50-150 ℃: 1 to 30 mass%; (B) polyglycerin fatty acid ester: 0.5 to 8 mass%; (C) a lipophilic surfactant having HLB of 2 to 6 other than the component (B); (D) dextrin fatty acid ester having 8 to 22 carbon atoms in the fatty acid moiety: 0.15 to 8 mass%; (E) hydrocarbon oil in liquid form at 25 ℃; (F) and (3) water.)

1. A water-in-oil type emulsified composition characterized by:

which comprises the following components (A), (B), (C), (D), (E) and (F):

(A) oily components with a melting point of 50-150 ℃: 1 to 30 mass%;

(B) polyglycerin fatty acid ester: 0.5 to 8 mass%;

(C) a lipophilic surfactant having HLB of 2 to 6 other than the component (B);

(D) dextrin fatty acid ester having 8 to 22 carbon atoms in the fatty acid moiety: 0.15 to 8 mass%;

(E) hydrocarbon oil in liquid form at 25 ℃;

(F) and (3) water.

2. A water-in-oil emulsion composition according to claim 1, wherein:

the component (A) is a ceramide.

3. A water-in-oil emulsion composition according to claim 1 or 2, wherein:

the component (B) is 1 or more than 2 selected from polyglyceryl di-fatty acid ester and polyglyceryl tri-fatty acid ester.

4. A water-in-oil emulsion composition according to any one of claims 1 to 3, wherein:

the component (C) is polyether-modified silicone.

5. A water-in-oil emulsion composition according to any one of claims 1 to 4, wherein:

the composition is in the form of a cream having a viscosity of 15 Pa.s or more and 5000 Pa.s or less at 25 ℃.

6. A water-in-oil emulsion composition according to any one of claims 1 to 5, wherein:

the content of the component (A) in the water-in-oil emulsion composition is 1.5 to 20 mass%.

7. A water-in-oil emulsion composition according to any one of claims 1 to 6, wherein:

the content of the component (B) in the water-in-oil emulsion composition is 0.7 mass% to 7 mass%.

8. A water-in-oil emulsion composition according to any one of claims 1 to 7, wherein:

the content of the component (D) in the water-in-oil emulsion composition is 0.2 to 6 mass%.

9. The water-in-oil emulsion composition according to any one of claims 1 to 8, wherein:

the total content of the component (B) and the component (C) in the water-in-oil emulsion composition is 0.5 to 12% by mass.

10. The water-in-oil emulsion composition according to any one of claims 1 to 9, wherein:

the component (A) is a compound represented by the general formula (1):

in the formula, R^1bA hydrocarbon group having 10 to 26 carbon atoms; r^2bA hydrocarbon group having 9 to 25 carbon atoms; x represents- (CH)₂)_n-, wherein n represents an integer of 2 to 6.

11. The water-in-oil emulsion composition according to any one of claims 1 to 10, wherein:

the component (D) is a dextrin fatty acid ester having 12 to 18 carbon atoms in the fatty acid moiety.

12. The water-in-oil emulsion composition according to any one of claims 1 to 11, wherein:

the component (E) is squalane.

13. The water-in-oil emulsion composition according to any one of claims 1 to 12, wherein:

the composition is in the form of a cream having a viscosity of 20 Pa.s or more and 1000 Pa.s or less at 25 ℃.

Technical Field

The present invention relates to a water-in-oil type emulsified composition.

Background

Emulsion compositions used as skin cosmetics and quasi drugs are roughly classified into oil-in-water emulsion compositions and water-in-oil emulsion compositions. Among them, the water-in-oil type emulsion composition has an excellent moisturizing feeling because the external phase is an oil phase, but has a problem in terms of a feeling of use such as a sticky feeling.

There are reports that: in order to improve the feeling of use of a water-in-oil emulsion composition, a technique of blending a specific gelling agent and a polyglycerol fatty acid ester and/or a polyoxyethylene hardened castor oil as an emulsifier is known (patent document 1). In addition, there are reports that: a technique of blending a ceramide as an oily component having a skin barrier function and being solid at room temperature at a high concentration and blending a phytosterol derivative and a dextrin fatty acid ester in order to obtain a composition for external use having good stability (patent document 2); there are also reports that: a technique of blending ceramide, an organically modified clay mineral, a diester of N-acyl glutamic acid, and phytosterol (patent document 3).

(patent document 1) International publication No. 99/25310

(patent document 2) Japanese patent laid-open No. 2016-

(patent document 3) Japanese Kokai publication No. 2010-513221

Disclosure of Invention

The present invention provides a water-in-oil emulsion composition comprising the following components (A), (B), (C), (D), (E) and (F):

(A) oily components with a melting point of 50-150 ℃: 1 to 30 mass%;

(B) polyglycerin fatty acid ester: 0.5 to 8 mass%;

(C) a lipophilic surfactant having HLB of 2 to 6 other than the component (B);

(D) dextrin fatty acid ester having 8 to 22 carbon atoms in the fatty acid moiety: 0.15 to 8 mass%;

(E) hydrocarbon oil in liquid form at 25 ℃;

(F) and (3) water.

Detailed Description

According to the techniques of patent documents 1 to 3, the film of the coated preparation does not sufficiently exhibit water-locking properties, and the protection feeling and the gloss feeling when applied to the skin and the satisfactory level of the feeling of good use that can impart no sticky feeling or uncomfortable feeling to the skin after application are not achieved.

Accordingly, the present invention provides a water-in-oil type emulsion composition which contains an oily component which is in a solid state at room temperature, is excellent in water-retaining property, skin-protecting feeling and gloss, and can impart a good feeling of use without stickiness and discomfort to the skin after application.

The present inventors have made studies on the water-in-oil emulsion composition containing an oily component which is solid at room temperature, and the water-locking property, protective feeling, and glossy feeling of the composition by blending various components, and as a result, have found that: when a polyglycerol fatty acid ester, a lipophilic surfactant having an HLB of 2 to 6, a dextrin fatty acid ester, and a hydrocarbon oil which is in a liquid state at 25 ℃ are blended in a specific ratio, a water-in-oil type emulsion composition which is excellent not only in water-locking property, but also in skin-protecting property and gloss property, can impart a good feeling of use without stickiness and discomfort to the skin after application, and has good storage stability can be obtained, and the present invention has been completed.

The water-in-oil emulsion composition of the present invention has excellent water-locking properties, i.e., a barrier function, and is excellent in both skin-protective feeling and gloss, and can impart good feeling of use without sticky feeling and unpleasant feeling to the skin after application, and further, the emulsion system does not separate even when stored for a long period of time, and is excellent in stability. In the water-in-oil type emulsion composition of the present invention, particularly in the case where the component (a) is a ceramide, whether or not the crystal is refined or amorphized in the preparation is confirmed by microscopic observation, and it is considered that the high water-locking property of the film of the coated preparation is caused by the refinement or amorphization.

In the water-in-oil type emulsion composition of the present invention, an oily component having a melting point of 50 to 150 ℃ is used as the component (A). The oily component having a melting point of 50 to 150 ℃ is an oily component which is solid at room temperature (5 to 35 ℃). Examples of the solid oily component include: sphingolipids such as ceramides and sphingosines (including natural products and synthetic products); sterols and the like such as cholesterol, dehydrocholesterol, β -sitosterol, stearoyl cholesterol ester, isostearyl cholesterol ester, and fatty acid cholesterol ester of vegetable oil; stearic acid, behenic acid, etc. C₁₆-C₂₂A fatty acid; c such as cetyl alcohol, stearyl alcohol, behenyl alcohol, batyl alcohol, and chimyl alcohol₁₆-C₂₂Alcohols and the like.

Examples of the ceramide include ceramide-like structural substances disclosed in, for example, Japanese patent application laid-open Nos. 62-228048, 63-216812, 63-227513, 64-29347, 64-31752 and 8-319263, in addition to natural ceramide and sphingosine derivative. Specifically, from the viewpoint of skin-covering feel and gloss imparted to the skin, compounds selected from the following general formulae (1) and (2) are preferred, and compounds of the general formula (1) are more preferred.

[ in the formula, R^1bA hydrocarbon group having 10 to 26 carbon atoms; r^2bA hydrocarbon group having 9 to 25 carbon atoms; x represents- (CH)₂)_n- (wherein n represents an integer of 2 to 6). Angle (c)

(in the formula, R¹And R²The same or different, represent a hydrocarbon group which may be hydroxylated and has 1 to 40 carbon atoms; r³An alkylene group having 1 to 6 carbon atoms or a single bond; r⁴Represents a hydrogen atom, an alkoxy group having 1 to 12 carbon atoms or a 2, 3-dihydroxypropoxy group. Wherein when R is³When it is a single bond, R⁴Is a hydrogen atom. )

In the general formulae (1) and (2), the hydrocarbon group is preferably an alkyl group or an alkenyl group.

Examples of the compound of the general formula (1) include N- (hexadecyloxypropyl) -N-hydroxyethyl hexadecanamide, and examples of the compound of the general formula (2) include bis 3-methoxypropylamide, which is a long-chain dibasic acid.

Among these components (a), ceramides (particularly, natural ceramides, sphingosines, and compounds represented by the general formulae (1) and (2)) and C are preferable from the viewpoint of water-holding property and skin-protecting feeling₁₆-C₂₂Fatty acid, C₁₆-C₂₂The alcohol is more preferably a ceramide, still more preferably a compound selected from the group consisting of the above general formula (1) and the above general formula (2), and still more preferably a compound of the above general formula (1). These solid oily components may be used in 1 kind or in combination of 2 or more kinds.

The water-in-oil emulsion composition of the present invention contains the component (a) in an amount of 1 to 30 mass%. When the content of the component (a) is within this range, sufficient water-holding property can be obtained, and a good skin-protecting feeling can be obtained, and a good use feeling without sticky feeling and uncomfortable feeling can be given to the skin after application. From the same viewpoint, the content of the component (a) is preferably 1.5% by mass or more, more preferably 2% by mass or more, further preferably 3% by mass or more, and further preferably 5% by mass or more, and is preferably 20% by mass or less, more preferably 18% by mass or less, and further preferably 16% by mass or less. The specific range is preferably 1.5% by mass or more and 20% by mass or less, more preferably 2% by mass or more and 18% by mass or less, further preferably 3% by mass or more and 18% by mass or less, and further preferably 5% by mass or more and 16% by mass or less.

The component (B) is polyglycerin fatty acid ester. The polyglycerin fatty acid ester is a polyglycerin moiety obtained by condensing 2 to 20 glycerin, and the fatty acid moiety is preferably C from the viewpoint of water-holding property, skin-protecting feeling, gloss feeling and storage stability, and also of imparting a good feeling of use without sticky feeling and unpleasant feeling to the skin after application₈-C₂₄A fatty acid. Among these polyglycerin fatty acid esters, polyglycerin fatty acid esters and polyglycerin fatty acid esters are preferable, and polyglycerin fatty acid esters are more preferable, from the viewpoint of water-holding property, skin-protecting feeling, gloss feeling and storage stability, and also from the viewpoint of imparting a good use feeling without stickiness and unpleasant feeling to the skin after application. As the fatty acid moiety, C is preferred₁₄-C₂₂More preferably C₁₆-C₂₂The fatty acid of (b) is more preferably oleic acid, isostearic acid, stearic acid, hydroxystearic acid, behenic acid, still more preferably isostearic acid, stearic acid, and particularly preferably isostearic acid.

More specifically, polyglycerol di-C is preferable₁₆-C₂₂Fatty acid ester and polyglycerin tri-C₁₆-C₂₂The fatty acid ester is more preferably polyglyceryl diisostearate or polyglyceryl triisostearate, and still more preferably polyglyceryl diisostearate.

The polyglycerol moiety of these polyglycerol fatty acid esters is preferably formed by condensing 2 to 12 glycerols, more preferably 2 to 10 glycerols, even more preferably 2 to 3 glycerols, and even more preferably 2 glycerols, from the viewpoint of water-holding properties, skin-protecting properties, gloss and storage stability, and from the viewpoint of imparting a good feeling of use to the skin after application without sticky feeling and unpleasant feeling.

The water-in-oil emulsion composition of the present invention contains the component (B) in an amount of 0.5 to 8 mass%. When the content of the component (B) is within this range, sufficient water-holding property can be obtained, and both skin-protecting feeling and gloss feeling are good, and a good use feeling without sticky feeling and unpleasant feeling can be imparted to the skin after application, and also the long-term storage stability is excellent. From the same viewpoint, the content of the component (B) is preferably 0.7% by mass or more, more preferably 0.8% by mass or more, and even more preferably 1% by mass or more, and is preferably 7% by mass or less, more preferably 6% by mass or less, even more preferably 5% by mass or less, and even more preferably 3% by mass or less. The specific range is preferably 0.7% by mass or more and 7% by mass or less, more preferably 0.8% by mass or more and 6% by mass or less, further preferably 1% by mass or more and 5% by mass or less, and further preferably 1% by mass or more and 3% by mass or less.

The component (C) is a lipophilic surfactant having an HLB of 2 to 6 other than the component (B). The water-in-oil emulsion composition of the present invention can provide a composition which retains excellent water-holding properties, has a high skin-protecting feeling, a high skin-covering feeling, and a high gloss feeling, has a good feeling of neither stickiness nor discomfort, and has good long-term storage stability by using both the component (B) and the component (C) in combination.

The lipophilic surfactant having an HLB of 2 to 6 is preferably a nonionic surfactant having an HLB of 2 to 6, and examples thereof include glycerin fatty acid esters, propylene glycol fatty acid esters, sorbitan fatty acid esters, polyoxyethylene castor oil, polyoxyethylene hardened castor oil fatty acid esters, polyethylene glycol fatty acid esters, alkyl glyceryl ethers, alkyl polyglyceryl ethers, polyoxyethylene alkyl ether fatty acid esters, polyoxyethylene alkylamines, silicone surfactants, and the like. Examples of the Silicone surfactant include polyether-modified Silicone, polyether-alkyl co-modified Silicone, polyglycerol-alkyl co-modified Silicone, alkyl-polyether modified Silicone, and alkyl Silicone dendritic polyether-modified Silicone, and examples of these include those having a linear Silicone chain, a branched Silicone chain, and a crosslinked Silicone chain, and commercially available products such as shin-Etsu chemical industries, Inc., Donglido Corning Co., Ltd, Michigan high-tech materials Japan, and Wacker Asahikasei Silicone Co., Ltd can be used.

Among these, silicone surfactants, polyoxyethylene hardened castor oil, alkyl glyceryl ethers, and sorbitan fatty acid esters are preferable, silicone surfactants, polyoxyethylene hardened castor oil, and alkyl glyceryl ethers are more preferable, and alkyl glyceryl ethers and silicone surfactants are further more preferable, from the viewpoint of improving emulsifiability, long-term storage stability, water-locking property, and preparing a suitable viscosity, and from the viewpoint of providing a good use feeling without stickiness and discomfort when applied to the skin.

The silicone surfactant is preferably a polyether-modified silicone, a polyglycerin-modified silicone, a polyether-alkyl co-modified silicone, or a polyglycerin-alkyl co-modified silicone, and more preferably a polyether-modified silicone. The silicone chain is preferably a linear type, a branched type, or a cross-linked type, more preferably a linear type or a branched type, and still more preferably a linear type. More specifically, preferred are polyether-modified silicones having a linear silicone chain, polyether-modified silicones having a branched silicone chain, polyether-alkyl co-modified silicones having a linear silicone chain, and polyether-alkyl co-modified silicones having a branched silicone chain, more preferred are polyether-modified silicones having a linear silicone chain and polyether-modified silicones having a branched silicone chain, and still more preferred are polyether-modified silicones having a linear silicone chain.

The component (C) is preferably polyoxyethylene hardened castor oil, alkyl glyceryl ether, polyether-modified silicone having a linear silicone chain, or polyether-modified silicone having a branched silicone chain, and more preferably alkyl glyceryl ether or polyether-modified silicone having a linear silicone chain, from the viewpoint of particularly improving emulsifiability, long-term storage stability, and water-holding property, and adjusting to an appropriate viscosity, and from the viewpoint of imparting a good feeling of use without sticky feeling or unpleasant feeling to the skin after application.

These can be used in 1 or 2 or more, and from the viewpoint of improving emulsifiability and long-term storage stability, maintaining excellent water-holding property, providing excellent skin-protecting feeling, skin-covering feeling and gloss feeling, and providing good use feeling without sticky feeling and unpleasant feeling, it is preferable to use 2 or more.

Commercially available products include polyether-modified silicones such as Silicone (Silicone) BY11-030(PEG/PPG-19/19 Dimethicone) (Torreya Corning Co.), Silicone BY22-008M (PEG/PPG-19/19 Dimethicone) (Torreya Corning Co.), Silicone SH3775M (PEG-12 Dimethicone) (Torreya Corning Co.), Silicone KF-6015(PEG-3 polydimethylsiloxane) (Xinyu chemical industry Co., Ltd.), Silicone KF-6017(PEG-10 polydimethylsiloxane) (Xinyu chemical industry Co., Ltd.), and Silicone KF-6028(PEG-9 dimethiconoethyl polydimethylsiloxane) (Xinyu chemical industry Co., Ltd.); polyoxyethylene hardened castor oil such as EMLEX HC-5(PEG-5 hydrogenated castor oil) (Nihon Emulsion), EMLEX RWIS-315 (PEG-15 hydrogenated castor oil triisostearate) (Nihon Emulsion), and isostearyl glyceryl ether. Among these, silicone BY11-030(PEG/PPG-19/19 Dimethicone), silicone SH3775M (PEG-12 Dimethicone), silicone KF-6015(PEG-3 polydimethylsiloxane), silicone KF-6017(PEG-10 polydimethylsiloxane), silicone KF-6028(PEG-9 polydimethylsiloxane), EMAX HC-5(PEG-5 hydrogenated castor oil), isostearyl glyceryl ether are more preferable, and silicone KF-6015(PEG-3 polydimethylsiloxane), silicone KF-6017(PEG-10 polydimethylsiloxane), isostearyl glyceryl ether are still more preferable. These may be used in 1 or 2 or more.

Here, HLB (Hydrophilic-lipophilic Balance) represents the molecular weight of a Hydrophilic group portion in the total molecular weight of a surfactant, and can be obtained by Griffin's (Griffin) formula.

The content of the component (C) in the water-in-oil type emulsion composition of the present invention is preferably 0.5% by mass or more, more preferably 0.8% by mass or more, further preferably 1% by mass or more, and further preferably 8% by mass or less, more preferably 7% by mass or less, further preferably 5% by mass or less, further preferably 3.5% by mass or less, and particularly preferably 2% by mass or less, from the viewpoint of improving the emulsifying property, long-term storage stability, and water-retaining property, and adjusting to an appropriate viscosity, and obtaining a good use feeling without stickiness and discomfort on the skin after application. The specific range is preferably 0.5% by mass or more and 8% by mass or less, more preferably 0.8% by mass or more and 7% by mass or less, further preferably 1% by mass or more and 5% by mass or less, further preferably 1% by mass or more and 3.5% by mass or less, and particularly preferably 1% by mass or more and 2% by mass or less.

The total content of the component (B) and the component (C) in the water-in-oil type emulsion composition of the present invention is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, further preferably 1.5% by mass or more, still more preferably 2% by mass or more, and particularly preferably 2.5% by mass or more, and further preferably 15% by mass or less, more preferably 12% by mass or less, still more preferably 10% by mass or less, still more preferably 8% by mass or less, particularly preferably 6% by mass or less, more particularly preferably 5% by mass or less, and most preferably 4.5% by mass or less, from the viewpoint of improving the emulsifying property, long-term storage stability, and water-retaining property, and preparing to an appropriate viscosity, and obtaining a good feeling of use without giving a sticky feeling and without giving a feeling of discomfort to the skin after application. The specific range is preferably 0.5% by mass or more and 12% by mass or less, more preferably 1.5% by mass or more and 10% by mass or less, further preferably 2% by mass or more and 8% by mass or less, further preferably 2% by mass or more and 6% by mass or less, particularly preferably 2.5% by mass or more and 5% by mass or less, and most preferably 2.5% by mass or more and 4.5% by mass or less.

The component (D) is a dextrin fatty acid ester having 8 to 22 carbon atoms in the fatty acid moiety. By containing such a dextrin fatty acid ester, the water-locking property of a film obtained by coating the preparation can be improved, and the skin-protecting feeling, skin-covering feeling, and storage stability can be improved, and a desired viscosity can be prepared. In particular, when the component (a) is a ceramide, it is considered that the coexistence of the component (D) makes the crystal size of the component (a) in the water-in-oil emulsion composition particularly small or amorphous, and thereby the water-locking property and the skin-protecting feeling of the film of the applied preparation particularly improve. The dextrin fatty acid ester as the component (D) is preferably a dextrin fatty acid ester having 12 to 18 carbon atoms in the fatty acid moiety, more preferably a dextrin fatty acid ester having 14 to 18 carbon atoms in the fatty acid moiety, still more preferably a dextrin fatty acid ester having 14 to 16 carbon atoms in the fatty acid moiety, and particularly preferably a dextrin fatty acid ester having 16 carbon atoms in the fatty acid moiety. Specific examples thereof include dextrin caprylate, dextrin caprate, dextrin laurate, dextrin ethylhexanoate, dextrin myristate, dextrin palmitate, dextrin stearate, dextrin isostearate, and dextrin behenate, and preferably dextrin ethylhexanoate, dextrin myristate, dextrin palmitate, and dextrin stearate, more preferably dextrin myristate and dextrin palmitate, and still more preferably dextrin palmitate, and 1 or 2 or more of these can be used. Further, 2 or more dextrin fatty acid esters produced in advance may be used, or a mixed fatty acid dextrin ester obtained by mixing fatty acids at the time of production to form a mixed fatty acid and then reacting the mixed fatty acid with dextrin may be used.

The water-in-oil emulsion composition of the present invention contains the component (D) in an amount of 0.15 to 8 mass%. When the content of the component (D) is within this range, sufficient water-holding properties can be obtained, and the skin-protecting feeling and the glossy feeling are both good, and the long-term storage stability is also excellent. From the same viewpoint, the content of the component (D) is preferably 0.2% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.4% by mass or more, and is preferably 6% by mass or less, more preferably 5% by mass or less, even more preferably 4% by mass or less, and even more preferably 2% by mass or less. The specific range is preferably 0.2% by mass or more and 6% by mass or less, more preferably 0.3% by mass or more and 5% by mass or less, further preferably 0.4% by mass or more and 4% by mass or less, and further preferably 0.4% by mass or more and 2% by mass or less.

The component (E) is a hydrocarbon oil which is in a liquid state at 25 ℃. By blending component (E) in addition to component (a) (solid oily component), and by blending components (B) to (D), not only can the water-locking property be improved, but also the skin moisturizing and gloss feeling can be improved, and the long-term storage stability can be improved.

Examples of such hydrocarbon oils include liquid paraffin, liquid isoparaffin, squalane, squalene and other linear or branched hydrocarbon oils, and squalane is preferred. These may be used in 1 or 2 or more.

The content of the component (E) in the water-in-oil emulsion composition of the present invention is preferably 1 mass% or more, more preferably 3 mass% or more, further preferably 4 mass% or more, further preferably 5 mass% or more, and particularly preferably 7 mass% or more, and further preferably 30 mass% or less, more preferably 20 mass% or less, further preferably 18 mass% or less, further preferably 16 mass% or less, particularly preferably 15 mass% or less, more particularly preferably 12 mass% or less, and most preferably 10 mass% or less, from the viewpoint of improving the water-holding power, skin-protecting feeling, skin-covering feeling, and glossy feeling, and good feeling of use without sticky feeling and unpleasant feeling, and long-term storage stability. The specific range is preferably 1% by mass or more and 30% by mass or less, more preferably 3% by mass or more and 30% by mass or less, further preferably 3% by mass or more and 20% by mass or less, further preferably 4% by mass or more and 18% by mass or less, particularly preferably 5% by mass or more and 16% by mass or less, more particularly preferably 7% by mass or more and 15% by mass or less, more particularly preferably 7% by mass or more and 12% by mass or less, and most preferably 7% by mass or more and 10% by mass or less.

The water-in-oil emulsion composition of the present invention contains (F) water as an aqueous component. The content of water in the water-in-oil emulsion composition of the present invention is preferably 10% by mass or more, more preferably 15% by mass or more, even more preferably 20% by mass or more, and further preferably 65% by mass or less, more preferably 60% by mass or less, even more preferably 50% by mass or less, from the viewpoint of water-holding property, skin-protecting feeling, gloss feeling, and long-term storage stability. The specific range is preferably 10% by mass or more and 65% by mass or less, more preferably 15% by mass or more and 60% by mass or less, and still more preferably 20% by mass or more and 50% by mass or less.

The water-in-oil emulsion composition of the present invention contains (G) 1 or 2 or more selected from dimer acid esters and N-acyl amino acid esters in addition to the components (a) to (F), and thus can further improve the water-holding property of the film after coating and can provide a more satisfactory skin-protecting feeling and gloss feeling.

The dimer acid ester includes an ester of a dimer acid with an alcohol, and is preferably an ester of a dimer dilinoleic acid, and more preferably an ester of a dimer dilinoleic acid with a dimer diol. The ester moiety of dimer acid or dimer dilinoleic acid preferably contains 1 or 2 or more moieties selected from behenyl group, isostearyl group, stearyl group, cetyl group and phytosterol group, and more preferably contains 2 or more moieties selected from behenyl group, isostearyl group, stearyl group, cetyl group and phytosterol group. More specifically, dimer dioleic acid dimer dioleyl bis (behenyl/isostearyl/phytosterol ester), dimer dioleic acid dimer dioleyl bis (phytosterol/isostearyl/cetyl/stearyl/behenyl ester), dimer dilinoleic acid (phytosterol/isostearyl/cetyl/stearyl/behenyl ester), dimer dilinoleic acid di (isostearyl/phytosterol ester), dimer dilinoleic acid di (diisostearic acid) and the like, preferably dimer dilinoleic acid (phytosterol ester/isostearyl/cetyl ester/stearyl ester/behenyl ester), dimer dilinoleic acid di (isostearyl/phytosterol ester), more preferably dimer dilinoleic acid (phytosterol ester/isostearyl/cetyl ester/stearyl ester/behenyl ester).

Examples of commercially available products include "Plandol-S and" H "as dimer dilinoleic acid (phytosterol ester/isostearyl ester/cetyl ester/stearyl ester/behenyl ester), as manufactured by Nippon Kogyo K.K." LUSPLAN PI-DA "as dimer dilinoleic acid di (isostearyl ester/phytosterol ester"), as "LUSPLANDD-DA" as dimer dilinoleic acid ester, "Plandol-G" as dimer dilinoleic acid (behenyl ester/isostearyl ester/phytosterol ester), and "LUSPLAN DD-IS" as dimer dilinostearic acid dimer dilinoleic acid ester.

The number of carbon atoms of the acyl group in the ester of an N-acylamino acid is preferably 10 to 30, more preferably 12 to 18. The acyl group may be saturated or unsaturated. For example, 2-ethylhexanoyl, lauroyl, myristoyl, palmitoyl, stearoyl, behenoyl, oleoyl, isostearoyl, linolenoyl (linolenoyl) and the like are preferable, myristoyl and lauroyl are more preferable, and lauroyl is further preferable. The acyl group may be derived from a mixed fatty acid, preferably a cocoyl fatty acid ester, a palm oil fatty acid ester, a palm kernel oil fatty acid ester, a sunflower oil fatty acid ester, and a macadamia nut oil fatty acid ester, more preferably a cocoyl fatty acid ester and a palm kernel oil fatty acid ester.

Further, the ester of an N-acylamino acid is preferably an alkyl ester of an N-acylamino acid. The number of carbon atoms of the alkyl group constituting the alkyl ester is preferably 1 to 30, more preferably 12 to 18. The alkyl group may have a branched, linear, or cyclic structure. For example, preferred examples include phytosterol groups such as octyl, lauryl, cetyl, stearyl, isostearyl, behenyl, octyldodecyl, campesterol group and sitosterol group, cholesteryl and decyltetradecyl groups.

The amino acid moiety in the N-acyl amino acid ester is an acidic amino acid, a neutral amino acid, or a basic amino acid, preferably an acidic amino acid or a neutral amino acid, and more preferably an acidic amino acid. More specifically, glutamic acid, aspartic acid, alanine, arginine, glycine, N-methylalanine, histidine, serine, threonine, sarcosine and the like are preferable, glutamic acid, aspartic acid, alanine, N-methylalanine, sarcosine are more preferable, and glutamic acid is further preferable.

Further, as for the ester of an N-acyl amino acid, a diester is more preferable than a monoester. More preferred are N-acyl lauroyl glutamic acid diester and N-acyl aspartic acid diester, and still more preferred is N-acyl lauroyl glutamic acid diester. The alkyl groups present in the diester 1 molecule may be the same or different, and preferably 2 or more.

In the present invention, the ester of an N-acylamino acid may contain one kind or two or more kinds in combination. For example, preferred examples are: N-lauroyl-L-glutamic acid di (cholesterol ester/behenyl/octyldodecyl ester), N-lauroyl-L-glutamic acid di (cholesterol ester/octyldodecyl ester), N-lauroyl-L-glutamic acid di (phytosterol ester/behenyl/octyldodecyl ester), N-lauroyl-L-glutamic acid di (phytosterol ester/octyldodecyl ester), N-myristoyl-N-methylalanine (phytosterol ester/decytetradecyl ester), etc., more preferably N-lauroyl-L-glutamic acid di (cholesterol ester/octyldodecyl ester), N-lauroyl-L-glutamic acid di (phytosterol/octyldodecyl ester).

Examples of commercially available esters of N-acylamino acids include: "ELDEW PS-203", "Plandogol-LG 2" (N-lauroyl-L-glutamic acid di (phytosterol ester/octyldecyl ester)), "ELDEW CL-301" (N-lauroyl-glutamic acid di (cholesteryl ester/behenyl ester/octyldodecyl ester)), "ELDEWCL-202" (N-lauroyl glutamic acid di (cholesteryl ester/octyldodecyl ester)), "ELDEW PS-304", "ELDEW PS-306", "Plandolol-LG 1", "Plandolol-LG 3", "Plandolol-LG 4" (N-lauroyl glutamic acid di (phytosterol ester/behenyl ester/octyldodecyl ester)) "ELDEW APS-307" (N-myristoyl-N-methylalanine (phytosterol ester/decyltetradecyl ester)), and the like.

These dimer acid esters and N-acylamino acid esters may contain 1 species or 2 or more species in combination, and preferably 2 or more species in combination.

The component (G) is preferably 1 or 2 or more selected from dimer acid esters and N-acyl amino acid esters, more preferably 1 or 2 or more selected from dimer dilinoleate and N-acyl amino acid diesters, and still more preferably 1 or 2 or more selected from dimer dilinoleate and N-acyl glutamic acid diesters. The component (G) containing a dimer acid ester and an N-acylamino acid ester preferably contains 2 or more species, and more preferably contains both a dimer dilinoleate and an N-acylated glutamic acid diester.

The content of the component (G) in the water-in-oil emulsion composition of the present invention is preferably 0.5% by mass or more, more preferably 1% by mass or more, further preferably 2% by mass or more, further preferably 2.5% by mass or more, particularly preferably 3% by mass or more, and further preferably 20% by mass or less, more preferably 12% by mass or less, further preferably 9% by mass or less, more preferably 7% by mass or less, from the viewpoints of improving water-holding capacity, skin-protecting feeling, and gloss feeling, and long-term storage stability. The specific range is preferably 0.5% by mass or more and 20% by mass or less, more preferably 0.5% by mass or more and 12% by mass or less, further preferably 1% by mass or more and 9% by mass or less, further preferably 2% by mass or more and 9% by mass or less, particularly preferably 2.5% by mass or more and 9% by mass or less, and most preferably 3% by mass or more and 7% by mass or less.

The water-in-oil emulsion composition of the present invention may further contain, in addition to the above components, a liquid oil other than the component (E), a humectant, a pharmaceutically effective component, a colorant, a preservative, an antioxidant, a chelating agent, a perfume, and the like.

Examples of the liquid oil other than the component (E) include silicone oil, ester oil, and fluorine oil. Examples of the humectant include polyhydric alcohols such as glycerin, 1, 3-butylene glycol, propylene glycol (propylene glycol), 1, 3-propylene glycol, dipropylene glycol, sorbitol, maltitol, mannitol, erythritol, xylitol, and trehalose, plant extracts, betaine, POE methylglucoside, and polyethylene glycol. As the active ingredient, a water-soluble drug or a water-insoluble drug can be used as desired, and specific examples thereof include glycyrrhetinic acid esters such as allantoin, glycyrrhetate, glycyrrhizic acid, and glycyrrhetinic acid stearyl ester, isopropylcresol, retinol derivatives, anti-wrinkle agents, whitening agents, bactericides, plant extracts, tocopheryl acetate, vitamins, salicylic acid, and indomethacin, and other active ingredients used in cosmetics, quasi drugs, and pharmaceuticals can also be used.

The water-in-oil emulsion composition of the present invention may be in a form that is water-in-oil and can be easily applied to the skin, and the viscosity at 25 ℃ is preferably 15Pa · s or more, more preferably 20Pa · s or more, further preferably 25Pa · s or more, further preferably 30Pa · s or more, and further preferably 5000Pa · s or less, more preferably 1000Pa · s or less, further preferably 500Pa · s or less, further preferably 300Pa · s or less, and particularly preferably 150Pa · s or less. The specific range is preferably 15Pa · s or more and 5000Pa · s or less in cream form, more preferably 20Pa · s or more and 1000Pa · s or less in cream form, further preferably 20Pa · s or more and 500Pa · s or less in cream form, further preferably 25Pa · s or more and 300Pa · s or less in cream form, and particularly preferably 30Pa · s or more and 150Pa · s or less in cream form. The viscosity at 25 ℃ can be measured with a B8R viscometer at 25 ℃ for 1 minute.

The water-in-oil emulsion composition of the present invention is prepared by, for example, mixing an oily component (water-insoluble component) under heating and stirring, and then mixing a water-soluble component under heating and stirring, according to a usual method. The water-in-oil emulsion composition of the present invention can be produced by adding the water-soluble component mixture to the oil component mixture, mixing the mixture, sufficiently stirring the mixture with a homogenizer, and then cooling the mixture.

The use of the water-in-oil emulsion composition of the present invention is not particularly limited, and the water-in-oil emulsion composition is preferably used for application to hair and/or skin, and particularly preferably used for application to skin such as face, body, hands and feet. Further, it is preferably used as an external preparation for skin, more preferably as a skin cosmetic. The method of use is not particularly limited, and application to hair and/or skin by hand or with a tool is preferred, and application to skin by hand or with a tool is more preferred.

The present invention further discloses the following composition in relation to the above embodiment.

< 1 > a water-in-oil type emulsion composition comprising the following components (A), (B), (C), (D), (E) and (F):

(A) oily components with a melting point of 50-150 ℃: 1 to 30 mass%;

(B) polyglycerin fatty acid ester: 0.5 to 8 mass%;

(C) a lipophilic surfactant having HLB of 2 to 6 other than the component (B);

(D) dextrin fatty acid ester having 8 to 22 carbon atoms in the fatty acid moiety: 0.15 to 8 mass%;

(E) hydrocarbon oil in liquid form at 25 ℃;

(F) and (3) water.

< 2 > the water-in-oil type emulsion composition as described in < 1 >, wherein the component (A) is a sphingolipid selected from the group consisting of ceramides, sphingosines (including natural and synthetic products); sterols and the like such as cholesterol, dehydrocholesterol, β -sitosterol, stearoyl cholesterol ester, isostearyl cholesterol ester, and fatty acid cholesterol ester of vegetable oil; stearic acid, behenic acid, etc. C₁₆-C₂₂A fatty acid; c such as cetyl alcohol, stearyl alcohol, behenyl alcohol, batyl alcohol, and chimyl alcohol₁₆-C₂₂1 or more than 2 of alcohol and its analogous compound; preferably selected from the group consisting of ceramides (in particular natural ceramides, sphingomyelins, compounds of the general formulae (1) and (2) above) and C₁₆-C₂₂Fatty acids and C₁₆-C₂₂1 or more than 2 of alcohol; is a ceramide; more preferably a compound selected from the group consisting of the above general formula (1) and the above general formula (2); further preferred is a compound represented by the above general formula (1).

The water-in-oil emulsion composition of < 3 > such as < 1 > or < 2 > wherein the content of the component (A) in the water-in-oil emulsion composition is preferably 1.5% by mass or more, more preferably 2% by mass or more, further preferably 3% by mass or more, further preferably 5% by mass or more, and further preferably 20% by mass or less, more preferably 18% by mass or less, further preferably 16% by mass or less.

< 4 > the water-in-oil emulsion composition according to any one of < 1 > to < 3 >, wherein the component (B) is preferably a polyglycerin di-fatty acid ester or a polyglycerin tri-fatty acid ester, and more preferably a polyglycerin di-C₁₆-C₂₂Fatty acid ester and polyglycerin tri-C₁₆-C₂₂The fatty acid ester is more preferably polyglyceryl diisostearate or polyglyceryl triisostearate.

The water-in-oil emulsion composition according to any one of < 5 > to < 4 >, wherein the content of the component (B) in the water-in-oil emulsion composition is preferably 0.7% by mass or more, more preferably 0.8% by mass or more, further preferably 1% by mass or more, and further preferably 7% by mass or less, more preferably 6% by mass or less, further preferably 5% by mass or less, and further preferably 3% by mass or less.

< 6 > the water-in-oil type emulsion composition according to any one of < 1 > to < 5 >, wherein the component (C) is preferably a nonionic surfactant having HLB in the range of 2 to 6, and is preferably selected from the group consisting of glycerin fatty acid ester, propylene glycol fatty acid ester, sorbitan fatty acid ester, polyoxyethylene castor oil, polyoxyethylene hardened castor oil fatty acid ester, polyethylene glycol fatty acid ester, and alkyl glyceryl ether, the silicone-based surfactant is preferably at least one selected from the group consisting of alkyl polyglyceryl ethers, polyoxyethylene alkyl ether fatty acid esters, polyoxyethylene alkylamines, and silicone-based surfactants, more preferably polyoxyethylene hardened castor oil, alkyl glyceryl ethers, polyether-modified silicones in which the silicone chain is linear, and polyether-modified silicones in which the silicone chain is branched, and even more preferably alkyl glyceryl ethers and polyether-modified silicones in which the silicone chain is linear.

The water-in-oil emulsion composition of any one of < 7 > to < 6 >, wherein the content of the component (C) in the water-in-oil emulsion composition is preferably 0.5% by mass or more, more preferably 0.8% by mass or more, further preferably 1% by mass or more, and further preferably 8% by mass or less, more preferably 7% by mass or less, further preferably 5% by mass or less, further preferably 3.5% by mass or less, and particularly preferably 2% by mass or less.

< 8 > the water-in-oil emulsion composition according to any one of < 1 > - < 7 >, wherein the total content of the component (B) and the component (C) in the water-in-oil emulsion composition is preferably 1.0% by mass or more, more preferably 1.5% by mass or more, further preferably 2% by mass or more, further preferably 2.5% by mass or more, and further preferably 12% by mass or less, more preferably 10% by mass or less, further preferably 8% by mass or less, further preferably 6% by mass or less, particularly preferably 5% by mass or less, and most preferably 4.5% by mass or less.

< 9 > the water-in-oil emulsion composition according to any one of < 1 > to < 8 >, wherein the component (D) is preferably a dextrin fatty acid ester having 12 to 18 carbon atoms in the fatty acid moiety, more preferably a dextrin fatty acid ester having 14 to 18 carbon atoms in the fatty acid moiety, still more preferably a dextrin fatty acid ester having 14 to 16 carbon atoms in the fatty acid moiety, and particularly preferably a dextrin fatty acid ester having 16 carbon atoms in the fatty acid moiety.

The water-in-oil emulsion composition according to any one of < 10 > to < 9 >, wherein the content of the component (D) in the water-in-oil emulsion composition is preferably 0.2% by mass or more, more preferably 0.3% by mass or more, further preferably 0.4% by mass or more, and further preferably 6% by mass or less, more preferably 5% by mass or less, further preferably 4% by mass or less, and further preferably 2% by mass or less.

The water-in-oil type emulsion composition of any one of < 11 > to < 10 >, wherein the component (E) is a straight or branched hydrocarbon oil such as liquid paraffin, liquid isoparaffin, squalane or squalene, preferably squalane.

The water-in-oil emulsion composition of any one of < 12 > to < 11 >, wherein the content of the component (E) in the water-in-oil emulsion composition is preferably 3% by mass or more, more preferably 4% by mass or more, further preferably 5% by mass or more, further preferably 7% by mass or more, and further preferably 20% by mass or less, more preferably 18% by mass or less, further preferably 16% by mass or less, further preferably 12% by mass or less.

The water-in-oil emulsion composition of any one of < 13 > to < 12 >, wherein the content of the component (F) is preferably 10% by mass or more, more preferably 15% by mass or more, further preferably 20% by mass or more, and further preferably 65% by mass or less, more preferably 60% by mass or less, further preferably 50% by mass or less.

< 14 > the water-in-oil emulsion composition according to any one of < 1 > -13 >, further comprising a component (G): 1 or more than 2 selected from dimer acid ester and N-acyl amino acid ester.

< 15 > the water-in-oil type emulsified composition according to < 14 >, wherein the component (G) is more preferably 1 or 2 or more selected from dimer dilinoleate and N-acyl amino acid diester, and still more preferably 1 or 2 or more selected from dimer dilinoleate and N-acyl glutamic acid diester.

The water-in-oil emulsion composition of < 16 > such as < 14 > or < 15 > wherein the content of the component (G) is preferably 0.5% by mass or more, more preferably 1% by mass or more, further preferably 2% by mass or more, further preferably 3% by mass or more, and further preferably 12% by mass or less, more preferably 9% by mass or less, further preferably 7% by mass or less.

The water-in-oil emulsion composition of any one of < 17 > to < 16 >, wherein the viscosity at 25 ℃ is preferably 15 pas or more, more preferably 20 pas or more, further preferably 25 pas or more, further preferably 30 pas or more, preferably 5000 pas or less, more preferably 1000 pas or less, further preferably 500 pas or less, further preferably 300 pas or less, and particularly preferably 150 pas or less.

< 18 > a water-in-oil type emulsion composition comprising the following components (A), (B), (C), (D), (E) and (F):

(A) ceramides: 1 to 30 mass%;

(B) polyglycerin fatty acid ester: 0.5 to 8 mass%;

(C) polyether modified silicone with HLB of 2-6;

(D) a dextrin fatty acid ester having 12 to 18 carbon atoms in the fatty acid moiety: 0.15 to 8 mass%;

(E) hydrocarbon oil in liquid form at 25 ℃;

(F) and (3) water.

< 19 > the water-in-oil type emulsion composition as described in < 18 > wherein the component (B) is 1 or more or 2 or more selected from the group consisting of polyglycerin di-fatty acid esters and polyglycerin tri-fatty acid esters.

< 20 > such as < 18 > or < 19 > wherein the component (A) is a compound of the above general formula (1).

The water-in-oil emulsion composition as described in any one of < 21 > to < 20 >, wherein the component (E) is squalane.

< 22 > the water-in-oil emulsion composition according to any one of < 18 > - < 21 >, which further comprises a component (G): 1 or more than 2 selected from dimer acid ester and N-acyl amino acid ester.

The water-in-oil emulsion composition of any one of < 23 > to < 22 > which is an external preparation for skin, preferably a skin cosmetic.

< 24 > a method for using a water-in-oil emulsion composition, which comprises applying the water-in-oil emulsion composition as described in any one of < 1 > to < 23 > to skin other than hair, preferably to any of face, body, hands and feet.