W / O / W emulsified composition

Abstract

Disclosed is a W / O / W emulsified composition exhibiting good stability. The W / O / W emulsified composition comprises an inner aqueous phase, an oil phase in which the aforementioned inner aqueous phase is dispersed, and an outer aqueous phase in which the aforementioned oil phase is dispersed, the aforementioned inner aqueous phase comprising an osmotic pressure adjusting agent, wherein the aforementioned osmotic pressure adjusting agent functions to generate an osmotic pressure between the aforementioned inner aqueous phase and the aforementioned outer aqueous phase, and comprises one or more selected from the group consisting of polyglycerin fatty acid esters having an average degree of polymerization of 2 to 9 of glycerin and polyethylene glycol dipolyhydroxystearate as a surfactant for emulsifying the aforementioned inner aqueous phase in the oil phase, and the aforementioned osmotic pressure adjusting agent comprises at least one selected from the group consisting of citric acid, citrate salts, and sulfate salts.

Description

[0001] Cross-reference of related applications

[0002] This patent application claims priority based on a prior application, Japanese Patent Application No. 2023-223483 (filed on December 28, 2023), which is a Japanese patent application. The entire disclosure of that prior patent application is incorporated herein by reference. Technical Field

[0003] This invention relates to W / O / W type emulsion compositions. Background Technology

[0004] Previously, O / W and W / O types were widely used as emulsified cosmetics. However, W / O / W type emulsified cosmetics, as multi-type emulsions, can provide a user experience that O / W and W / O type emulsified cosmetics do not have. For example, there are known cosmetics that have a moisturizing feel when applied to the skin, such as those that undergo a phase change upon application.

[0005] For example, the W / O / W type emulsion composition disclosed in Patent Document 1 has a small amount of internal aqueous phase pre-set during manufacturing. After the W / O / W type emulsion composition is prepared, water is transferred from the external aqueous phase to the internal aqueous phase by utilizing the osmotic pressure difference. Therefore, a high internal phase (oil phase + internal aqueous phase) ratio can be obtained with a relatively small amount of oil phase, resulting in high viscosity and a moisturizing feel. Furthermore, a unique phase transition sensation is achieved when applied to the skin, accompanied by the release of the internal aqueous phase.

[0006] In addition, by adding agents to the inner aqueous phase, W / O / W type emulsion compositions can cover the aforementioned agents with the oil phase and the outer aqueous phase, thereby improving their stability such as oxidation resistance.

[0007] On the other hand, compared with O / W type emulsion compositions or W / O type emulsion compositions, W / O / W type emulsion compositions are more difficult to form emulsions. Even when manufactured in W / O / W emulsion form, they will have the problem of reduced emulsion stability over time or with temperature changes.

[0008] To address this issue, it is desirable to develop W / O / W type emulsion compositions that exhibit high stability over time and with temperature variations.

[0009] Existing technical documents

[0010] Patent documents

[0011] Patent Document 1: Japanese Patent Application Publication No. 2002-275029 Summary of the Invention

[0012] The inventors have discovered that W / O / W emulsion compositions formulated with specific osmotic pressure regulators exhibit excellent stability, particularly at high temperatures. This invention is based on this insight.

[0013] Therefore, the present invention provides a W / O / W type emulsion composition exhibiting good stability.

[0014] According to the present invention, the following invention is provided.

[0015] (1) A composition, which is a W / O / W type emulsion composition, comprising:

[0016] Internal water phase;

[0017] An oil phase containing the aforementioned internal aqueous phase; and

[0018] The aqueous phase containing the aforementioned oil phase,

[0019] The aforementioned internal aqueous phase contains an osmotic pressure regulator, which is a substance that generates osmotic pressure between the aforementioned internal aqueous phase and the aforementioned external aqueous phase.

[0020] The surfactant used to emulsify the aforementioned aqueous phase in the oil phase includes one or more species selected from the group consisting of polyglycerol fatty acid esters with an average degree of polymerization of glycerol of 2 to 9 and polyethylene glycol dimerized hydroxystearate.

[0021] The aforementioned osmotic pressure regulator includes at least one selected from the group consisting of citric acid, citrate, and sulfate.

[0022] (2) The composition according to (1), wherein the amount of the aforementioned osmotic pressure regulator relative to the aforementioned composition is 0.01 to 0.5 by weight.

[0023] (3) The composition according to (1) or (2), wherein the surfactant used to emulsify the aforementioned aqueous phase in the oil phase comprises one or more polyglycerol fatty acid esters selected from the group consisting of polyglycerol oleate, polyglycerol isostearate, polyglycerol diisostearate, polyglycerol dihydroxystearate and polyglycerol polyricinoleate, having an average degree of polymerization of glycerol of 2 to 9.

[0024] (4) The composition according to (3), wherein the surfactant that emulsifies the aforementioned aqueous phase in the oil phase contains at least one OH group in the main chain of fatty acid residues.

[0025] (5) The composition according to any one of (1) to (3), wherein the surfactant used to emulsify the aforementioned aqueous phase in the oil phase comprises one or more polyglycerol fatty acid esters selected from the group consisting of polyglycerol-4 oleate, polyglycerol-6 oleate, polyglycerol-2 isostearate, polyglycerol-6 polyricinoleate, polyglycerol-2 diisostearate and polyglycerol-2 dihydroxystearate.

[0026] (6) The composition according to any one of (1) to (5), wherein the surfactant used to emulsify the aforementioned aqueous phase in the oil phase comprises polyglycerol-6 polyricinoleate.

[0027] (7) The composition according to any one of (1) to (6), wherein the aforementioned oil phase comprises one or more oil components selected from the group consisting of polar oils with an IOB value of 0.1 to 0.8.

[0028] (8) The composition according to (7), wherein the aforementioned oil is selected from one or more of the group consisting of castor seed oil, bis-diglyceride polyacryladiate-2 and dimeric pentaerythritol hexahydroxystearate.

[0029] (9) The composition according to (7) or (8), wherein the amount of the aforementioned oil relative to the aforementioned composition is 3 to 20 by weight.

[0030] (10) The composition according to any one of (1) to (9), wherein the aforementioned external aqueous phase comprises a thickener having an alkyl group.

[0031] (11) The composition according to (10), wherein the aforementioned alkyl thickener is selected from one or more of the group consisting of alkyl-modified carboxyvinyl polymers, ammonium acryloyl dimethyl taurate / behenol polyether-25 methacrylate crosspolymers and acrylate / stearyl polyether-20 methacrylate copolymers.

[0032] (12) The composition according to any one of (1) to (11) is a cosmetic composition.

[0033] According to the present invention, a W / O / W type emulsion composition exhibiting good stability is provided. Detailed Implementation

[0034] According to one aspect of the present invention, a W / O / W type emulsified composition is provided, comprising an inner aqueous phase, an oil phase in which the inner aqueous phase is dispersed, and an outer aqueous phase in which the oil phase is dispersed. The inner aqueous phase of the composition comprises an osmotic pressure regulator. This osmotic pressure regulator contains at least one selected from the group consisting of citric acid, citrate, and sulfate, which creates osmotic pressure between the inner and outer aqueous phases, causing water to transfer from the outer aqueous phase to the inner aqueous phase. Thus, the following effects are expected: a high inner phase (oil phase + inner aqueous phase) ratio can be obtained with a relatively small amount of oil phase, achieving a moisturizing feel while maintaining high viscosity, and a unique phase transition sensation accompanying the release of the inner aqueous phase when applied to the skin. The composition contains at least one surfactant selected from the group consisting of polyglycerol fatty acid esters with an average degree of polymerization of glycerol of 2 to 9 and polyethylene glycol dihydroxystearate, which emulsifies the inner aqueous phase in the oil phase.

[0035] The W / O / W type emulsion composition of the present invention has a structure in which a W / O type emulsion is dispersed in an external aqueous phase.

[0036] In the W / O type emulsion forming the inner phase of the present invention, an osmotic pressure regulator is included in the aqueous phase, which is the innermost phase. The osmotic pressure regulator of the present invention comprises at least one selected from the group consisting of citric acid, citrate, and sulfate, preferably citrate, and more preferably sodium citrate. The amount of the osmotic pressure regulator of the present invention relative to the total amount of the emulsion composition is preferably 0.01 to 0.5% by weight, more preferably 0.02 to 0.2% by weight.

[0037] In this invention, the aforementioned aqueous phase and oil phase are emulsified with one or more surfactants selected from the group consisting of polyglycerol fatty acid esters with an average degree of polymerization of glycerol of 2 to 9 and polyethylene glycol dihydroxystearate to form a W / O type emulsion.

[0038] According to one embodiment of the present invention, the W / O / W type emulsifying composition of the present invention comprises one or more polyglycerol fatty acid esters with an average degree of polymerization of glycerol of 2 to 9 as surfactants for emulsifying the inner aqueous phase in the oil phase. Preferably, the polyglycerol fatty acid ester with an average degree of polymerization of glycerol of 2 to 9 in the present invention is one or more polyglycerol fatty acid esters selected from the group consisting of polyglycerol oleate, polyglycerol isostearate, polyglycerol diisostearate, polyglycerol dihydroxystearate, and polyglycerol polyricinoleate, more preferably one or more polyglycerol fatty acid esters selected from the group consisting of polyglycerol-4 oleate, polyglycerol-6 oleate, polyglycerol-2 isostearate, polyglycerol-6 polyricinoleate, polyglycerol-2 diisostearate, and polyglycerol-2 dihydroxystearate, and even more preferably polyglycerol-6 polyricinoleate.

[0039] According to another embodiment of the present invention, the W / O / W type emulsifying composition of the present invention comprises one or more polyglycerol fatty acid esters with an average degree of polymerization of glycerol of 2 to 9 as surfactants for emulsifying the inner aqueous phase in the oil phase. Preferably, the polyglycerol fatty acid ester with an average degree of polymerization of glycerol of 2 to 9 in the present invention is a polyglycerol fatty acid ester selected from the group consisting of polyglycerol oleate, polyglycerol isostearate, polyglycerol diisostearate, polyglycerol dihydroxystearate, and polyglycerol polyricinoleate, with an average degree of polymerization of glycerol of 2 to 9. More preferably, such polyglycerol fatty acid esters contain at least one OH group in the main chain of fatty acid residues, such as polyglycerol-6 polyricinoleate.

[0040] According to another embodiment of the present invention, the W / O / W type emulsifying composition of the present invention contains one or more polyethylene glycol dihydroxystearate as a surfactant for emulsifying the inner aqueous phase in the oil phase.

[0041] According to a preferred embodiment of the present invention, the W / O / W type emulsifying composition of the present invention comprises one or more polyglycerol fatty acid esters of glycerol having an average degree of polymerization of 2 to 9 as a surfactant for emulsifying the inner aqueous phase in the oil phase.

[0042] The surfactant in the W / O / W type emulsifying composition of the present invention is selected from the group consisting of polyglycerol fatty acid esters with an average degree of polymerization of glycerol of 2 to 9 and polyethylene glycol dihydroxystearate, and if a commercially available surfactant is available, it may be used.

[0043] The amount of surfactant in the W / O / W type emulsifying composition of the present invention, which is selected from the group consisting of polyglycerol fatty acid esters with an average degree of polymerization of glycerol of 2 to 9 and polyethylene glycol dihydroxystearate, is not limited, but is preferably 0.5 to 2 by weight.

[0044] According to a preferred embodiment of the present invention, the W / O / W type emulsifying composition of the present invention comprises one or more oils selected from the group consisting of polar oils with an IOB value of 0.1 to 0.8. Such oils are those commonly used in cosmetics, pharmaceuticals, food, etc., and are preferably one or more selected from the group consisting of pentaerythritol tetra(ethylhexanoate), glyceryl diisostearate, phytosterol / octyldodecyl lauroyl glutamate, bis-diglycerol polyacryladiate-2, dimeric pentaerythritol hexahydroxystearate, and castor oil; more preferably, one or more selected from the group consisting of castor oil, bis-diglycerol polyacryladiate-2, and dimeric pentaerythritol hexahydroxystearate. It should be noted that the IOB value is an abbreviation for Inorganic / Organic Balance (Inorganic / Organic Ratio), which is a value representing the ratio of inorganic value to organic value, and is an indicator of the polarity of organic compounds. The IOB value is specifically expressed as "IOB value = Inorganic value / Organic value". Here, regarding each of the "inorganic value" and "organic value", for example, the "organic value" is 20 for one carbon atom in the molecule and 100 for one hydroxyl group. The "inorganic value" and "organic value" are set corresponding to various atoms or functional groups. By summing the "inorganic value" and "organic value" of all atoms and functional groups in the organic compound, the IOB value of the organic compound can be calculated (see, for example, Fujita, *Chemistry*, Vol. 11, No. 10, pp. 719-725, 1957).

[0045] The amount of one or more oils selected from the group consisting of polar oils with an IOB value of 0.1 to 0.8 in the W / O / W type emulsified composition of the present invention relative to the total amount of the composition is not particularly limited, but is preferably 3 to 20% by weight, more preferably 5 to 10% by weight. It should be noted that the W / O / W type emulsified composition of the present invention may also generally further include oils used in cosmetics, pharmaceuticals, food, etc. Such oils are not particularly limited, and examples include hydrocarbon oils, ester oils, silicone oils, higher alcohols with 12 to 22 carbon atoms, fatty acids with 12 to 22 carbon atoms, and oils and fats.

[0046] Examples of hydrocarbon oils used in this invention include liquid paraffin, squalane, squalene, pteroscarane, paraffin wax, isoparaffins, hydrogenated polyisobutylene, olefin oligomers, and volatile hydrocarbon oils (such as isododecane, isohexadecane, undecane, tridecane, etc.).

[0047] Examples of ester oils used in this invention include isopropyl myristate, cetyl ethylhexanoate, octyl dodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyl octanoate, cetyl lactate, myristyl lactate, isocetyl stearate, isocetyl isostearate, cholesterol 12-hydroxystearate, ethylene glycol bis(2-ethylhexanoate), dipentaerythritol fatty acid ester, N-alkyl diol monoisostearate, neopentyl glycol didecanoate, diisostearate malate, glyceryl di(2-heptyl undecanoate), trimethylolpropane tri(2-ethylhexanoate), trimethylolpropane triisostearate, glyceryl triisostearate, pentaerythritol tetra(ethylhexanoate), and glyceryl triisostearate. Triethylhexanoate (glyceryl tri(2-ethylhexanoate) ester), cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristicate, glyceryl tri(2-heptylundecanoate), methyl castor oil, oleyl alcohol ester, octadecyl alcohol, acetylglycine ester, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di(2-heptylundecyl) adipate, ethyl laurate, di(2-diethylhexyl) sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, polypropylene glycol dineopentate, ethyl acetate, butyl acetate, amyl acetate, triethyl citrate, etc.

[0048] Examples of silicone oils used in this invention include chain polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydropolysiloxane, as well as cyclic polysiloxanes such as decamethylpolysiloxane, dodecylpolysiloxane, and tetramethyltetrahydropolysiloxane.

[0049] Examples of higher alcohols with 12 to 22 carbon atoms in this invention include oleyl alcohol, 2-decyltetradecanool, dodecyl alcohol, isostearyl alcohol, and octyldodecyl alcohol. Examples of fatty acids with 12 to 22 carbon atoms include oleic acid, isostearic acid, linoleic acid, and linolenic acid.

[0050] Examples of oils used in this invention include cocoa seed butter, avocado oil, camellia seed oil, macadamia seed oil, corn oil, olive fruit oil, rapeseed oil, sesame seed oil, almond oil, wheat germ oil, camellia seed oil, castor seed oil, flaxseed oil, safflower seed oil, cottonseed oil, perilla seed oil, soybean oil, peanut oil, tea seed oil, torreya seed oil, rice bran oil, tung oil, Japanese tung oil, jojoba seed oil, germ oil, triglycerides, caprylic acid glycerides, and triisopalmitic acid glycerides.

[0051] According to a preferred embodiment of the present invention, the W / O / W type emulsion composition of the present invention further comprises an alkyl-based thickener. Such an alkyl-based thickener is not limited as long as it is an alkyl-based compound capable of being used as a thickener, and is included in the external aqueous phase for dispersing the oil phase (W / O emulsion) in the external aqueous phase. The amount of the alkyl-based thickener in the present invention is preferably 0.01 to 2% by weight relative to the total amount of the emulsion composition. The alkyl-based thickener in the present invention is not limited, but is preferably selected from one or more of the group consisting of alkyl-modified carboxylated vinyl polymers, ammonium acryloyl dimethyl taurate / behenol polyether-25 methacrylate crosspolymers, and acrylic (ester) / stearyl polyether-20 methacrylate copolymers.

[0052] The alkyl-modified carboxyvinyl polymer in this invention is preferably an acrylate / C10-30 alkanol acrylate crosslinked polymer, which functions as an emulsifier and thickener. The alkyl-modified carboxyvinyl polymer in this invention is not limited, but preferably has a molecular weight of approximately 500,000 to 3,000,000. If commercially available alkyl-modified carboxyvinyl polymers are available, they can be used, such as "CARBOPOL 1342", "PEMULEN TR-1", and "PEMULEN TR-2" (all manufactured by Lubrizol).

[0053] According to a preferred embodiment of the present invention, the W / O / W type emulsifying composition of the present invention may contain a polyol in the external aqueous phase and / or the internal aqueous phase. Examples of such polyols include glycerol, 1,3-butanediol, and dipropylene glycol. Furthermore, the amount of such polyol is preferably 5 to 25% by weight relative to the total amount of the emulsifying composition.

[0054] In the W / O / W type emulsifying composition of the present invention, any additives commonly used in cosmetics may be further included as needed, without impairing the effects of the present invention. Examples of such additives include cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl hydroxypropyl cellulose, methyl cellulose, carboxymethyl cellulose, quince seed, carrageenan, pectin, mannan, gel polysaccharide, chondroitin sulfate, starch, galactan, dermatan sulfate, glycogen, gum arabic, heparan sulfate, hyaluronic acid, sodium hyaluronate, tragacanth gum, keratin sulfate, chondroitin, xanthan gum, sulfated mucopolysaccharide, hydroxyethyl guar gum, carboxymethyl guar gum, guar gum, dextran, keratin sulfate, carob gum, succinyl dextran, carotenoid acid, chitosan, deacetylated chitosan, carboxymethyl chitosan, thickeners such as agar, and lower alcohols such as ethanol. Antioxidants such as butylated hydroxytoluene, tocopherol (vitamin E), and inositol hexaphosphate; antibacterial agents such as benzoic acid, salicylic acid, sorbic acid, alkyl p-hydroxybenzoate, and hexachlorophenol; anti-aminobenzoic acid (hereinafter referred to as "PABA"), monoglyceride PABA ester, N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA methyl ester, N,N-dimethyl PABA ethyl ester, N,N-dimethyl PABA butyl ester, and N,N-dimethyl PABA 2-ethylhexyl ester; and homomenthyl-N-acetyl-o-aminobenzoic acid homomenthyl-N-acetyl Anthranilate and other anthranilic acid-based UV absorbers, pentyl salicylate, menthol salicylate, holomethyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropylphenyl salicylate and other salicylic acid-based UV absorbers, octyl cinnamate, ethyl 4-isopropylcinnamate, methyl 2,5-diisopropylcinnamate, ethyl 2,4-diisopropylcinnamate, methyl 2,4-diisopropylcinnamate, propyl p-methoxycinnamate, isopropyl p-methoxycinnamate, isoamyl p-methoxycinnamate, octyl p-methoxycinnamate (2-ethylhexyl p-methoxycinnamate), 2-ethoxyethyl p-methoxycinnamate, cyclohexyl p-methoxycinnamate, ethyl α-cyano-β-phenylcinnamate Cinnamic acid-based ultraviolet absorbers include 2-ethylhexyl α-cyano-β-phenylcinnamic acid, mono-2-ethylhexanoyl-di-p-methoxycinnamic acid glyceryl ester, and others; [3-bis(trimethylsiloxy)methylsilyl-1-methylpropyl]-3,4,5-trimethoxycinnamate, [3-bis(trimethylsiloxy)methylsilyl-3-methylpropyl]-3,4,5-trimethoxycinnamate, [3-bis(trimethylsiloxy)methylsilylpropyl]-3,4,5-trimethoxycinnamate, [3-bis(trimethylsiloxy)methylsilylbutyl]-3,4,5-trimethoxycinnamate, and [3-tri(trimethylsiloxy)silylbutyl]-3,4,5-trimethoxycinnamate.[3-Tris(trimethylsiloxy)silylbutyl]-3,4,5-trimethoxycinnamate, [3-tris(trimethylsiloxy)silyl-1-methylpropyl]-3,4-dimethoxycinnamate and other organosilicon-based cinnamic acid UV absorbers, 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylic acid ester, 2-hydroxy-4-n-octyl Benzophenone, 4-hydroxy-3-carboxybenzophenone and other benzophenone-based UV absorbers; 3-(4'-methylbenzylene)-d,l-camphor, 3-benzylene-d,l-camphor; ethyl urocanate; 2-phenyl-5-methylbenzoxazole; 2,2'-hydroxy-5-methylphenylbenzotriazole; 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole; 2-(2'-hydroxy-5'-methylphenyl)benzotriazole; dibenzyl azidine; anisylmethane; 4-methoxy-4'-tert-butyldibenzoylmethane; 5-(3,3'-dimethyl-2-norbornene)-3-pentan-2-one and other UV absorbers; acylsarcosine (e.g., sodium lauroyl sarcosine); glutathione... Organic acids such as glutathione, citric acid, malic acid, tartaric acid, and lactic acid; vitamin A and its derivatives; vitamin B6 hydrochloride, vitamin B6 trimalpalate, vitamin B6 dicaprylate; vitamin B2 and its derivatives; vitamin B12; vitamin B15 and its derivatives; vitamin E derivatives such as α-tocopherol, β-tocopherol, and γ-tocopherol; vitamin E acetate; vitamin D derivatives; vitamin H; pantothenic acid; pantothenic acid; nicotinamide; benzyl nicotinate; γ-oryzanol; allantoin; glycyrrhizic acid (salt); glycyrrhetinic acid and its derivatives; tranexamic acid and its derivatives [as tranexamic acid derivatives, dimers of tranexamic acid can be listed (e.g., trans-4-(trans-aminomethylcyclohexanecarbonyl)amino(hydrochloride))] [Methylcyclohexane carboxylic acid, etc.), esters of tranexamic acid and hydroquinone (e.g., trans-4-aminomethylcyclohexane carboxylic acid 4'-hydroxyphenyl ester, etc.), esters of tranexamic acid and gentianic acid (e.g., 2-(trans-4-aminomethylcyclohexylcarbonyloxy)-5-hydroxybenzoic acid and its salts, etc.), amides of tranexamic acid (e.g., trans-4-aminomethylcyclohexane carboxylic acid methylamide and its salts, trans-4-(p-methoxybenzoyl)aminomethylcyclohexane carboxylic acid and its salts, trans-4-guanidinylmethylcyclohexane carboxylic acid and its salts, etc.), physalisol, bisabolol, eucalyptol, thymol, inositol, saikosaponins, ginsenosides, loofah saponins, soapberry saponins and other saponins, panthenol ethyl ether, ethinyl estradiol, tranexamic acid, arbutin, sennaeExtracts, pigments, porous and / or water-absorbent powders (e.g., starches obtained from corn, potatoes, etc., anhydrous silicic acid, talc, kaolin, magnesium aluminum silicate, calcium alginate, etc. powders, sorbitan monolaurate, sorbitan monopalmitate, sorbitan sesquioleate, sorbitan trioleate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyethylene glycol monooleate, polyoxyethylene alkyl ether, polyethylene glycol diether, lauroyl diethanolamide, fatty acid isopropanolamide, maltitol hydroxy fatty acid ether, alkylated polysaccharide, alkyl glucoside, sugar ester, etc. nonionic surfactants, stearyl trimethyl ammonium chloride, benzalkonium chloride lauramine oxide, etc. cationic surfactants, sodium palmitate, sodium laurate (Japanese: ラウリン酸ナトリウム), sodium laurate (Japanese: ラウリル酸ナトリウム), potassium lauryl sulfate, triethanolamine alkyl ether sulfate, Turkey red oil, linear dodecylbenzene sulfonic acid, polyoxyethylene hydrogenated castor oil maleate, acyl methyl taurine, etc. anionic surfactants, amphoteric surfactants, neutralizing agents, preservatives, (cosmetic) fragrances, pigments, etc.) of various agents such as placental proteins (animal), Rumex acetosa, Sophora flavescens, Nuphar japonicum Miq., Citrus aurantium L., Salvia officinalis, Achillea millefolium, Malva sylvestris leaf powder, Swertia japonica powder, Thymus vulgaris, Angelica acutiloba Kitag., Citrus aurantium, Betula platyphylla, Equisetum arvense, Luffa cylindrica, Aesculus hippocastanum, Saxifraga stolonifera, Arnica montana flower / root / stem powder, Lilium brownii var. viridulum bulb, Artemisia princeps Pamp., Paeonia lactiflora, Aloe vera, Gardenia jasminoides Ellis fruit, Chamaecyparis pisifera, etc.

[0055] The method for producing the W / O / W type emulsion composition of the present invention is not particularly limited and can be produced by a conventional method. For example, it can be obtained by stirring and mixing with an emulsifier such as a homogenizer or a disperser to prepare the produced W / O type emulsion and then mixing / emulsifying it with the external aqueous phase.

[0056] The composition of the present invention can also be a cosmetic composition. The cosmetic composition in the present invention refers to a composition used for cosmetic purposes.

[0057] Examples

[0058] The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the content is expressed in weight%.

[0059] W / O / W type emulsion compositions, as shown in Table 1 below, were prepared using four different osmotic pressure regulators (monosodium glutamate, sodium citrate, magnesium sulfate, and magnesium chloride). The W / O / W type emulsion compositions were obtained by adding an aqueous phase containing an osmotic pressure regulator to an oil phase containing a surfactant, performing W / O emulsification using a homogenizer, and then adding the W / O emulsion to an external aqueous phase and dispersing it using a disperser. For each sample, the viscosity was measured the following day using a VISCOMETER TVB-15 (manufactured by Toki Sangyo Co., Ltd.) at rotor No. 7, 10 rpm, and a sample temperature of 30°C. The pH and particle size of the emulsion particles were also measured. Furthermore, the viscosity of each sample after storage under various conditions was also measured. The following conditions are defined as follows: A) the viscosity after 4 weeks at 50°C relative to the second day, or the viscosity after 2 weeks at 60°C relative to the second day, is 70% or higher; B) the viscosity is 50% or higher but less than 70%; C) the viscosity is 30% or higher but less than 50%; D) the viscosity is less than 30% or the product has separated; and B is considered acceptable. The results are shown in Table 1.

[0060] [Table 1]

[0061]

[0062] As shown in Table 1, the W / O / W type emulsion compositions of Experimental Examples 2 and 3 exhibited relatively small viscosity changes over time, especially at high temperatures, demonstrating good stability.

[0063] Next, W / O / W type emulsion compositions were prepared using sodium citrate at various concentrations, as shown in Table 2 below. The viscosity over time, pH, and particle size of the emulsion particles were evaluated using the same methods / evaluation criteria as described above. The results are shown in Table 2.

[0064] [Table 2]

[0065]

[0066] As shown in Table 2, the W / O / W type emulsion compositions of Experiments 5 to 7 showed almost no change in viscosity over time at various temperatures, indicating good stability.

Claims

1. A composition, which is a W / O / W type emulsion composition, comprising: Internal water phase; An oil phase in which the aforementioned aqueous phase is dispersed; and The aqueous phase containing the oil phase is dispersed in the water phase. The inner aqueous phase contains an osmotic pressure regulator, which is a substance that generates osmotic pressure between the inner aqueous phase and the outer aqueous phase. The surfactant used to emulsify the internal aqueous phase in the oil phase includes one or more selected from the group consisting of polyglycerol fatty acid esters with an average degree of polymerization of glycerol of 2 to 9 and polyethylene glycol dimerized hydroxystearate. The osmotic pressure regulator comprises at least one selected from the group consisting of citric acid, citrate, and sulfate.

2. The composition according to claim 1, wherein, The amount of the osmotic pressure regulator relative to the composition is 0.01 to 0.5 by weight.

3. The composition according to claim 1, wherein, As a surfactant for emulsifying the internal aqueous phase in the oil phase, the surfactant comprises one or more polyglycerol fatty acid esters selected from the group consisting of polyglycerol oleate, polyglycerol isostearate, polyglycerol diisostearate, polyglycerol dihydroxystearate, and polyglycerol polyricinoleate, having an average degree of polymerization of glycerol of 2 to 9.

4. The composition according to claim 3, wherein, The surfactant that emulsifies the aqueous phase in the oil phase contains at least one OH group in the main chain of fatty acid residues.

5. The composition according to claim 1, wherein, As a surfactant for emulsifying the internal aqueous phase in the oil phase, it comprises one or more polyglycerol fatty acid esters selected from the group consisting of polyglycerol-4 oleate, polyglycerol-6 oleate, polyglycerol-2 isostearate, polyglycerol-6 polyricinoleate, polyglycerol-2 diisostearate, and polyglycerol-2 dihydroxystearate.

6. The composition according to claim 1, wherein, As a surfactant for emulsifying the internal aqueous phase in the oil phase, polyglycerol-6 polyricinoleate is included.

7. The composition according to claim 1, wherein, The oil phase comprises one or more oil components selected from the group consisting of polar oils with an IOB value of 0.1 to 0.

8.

8. The composition according to claim 7, wherein, The oil is selected from one or more of the following groups: castor seed oil, bis-diglycerol polyacryladiate-2, and dimeric pentaerythritol hexahydroxystearate.

9. The composition according to claim 7, wherein, The amount of oil relative to the composition is 3 to 20 by weight.

10. The composition according to claim 1, wherein, The external aqueous phase contains a thickener having alkyl groups.

11. The composition according to claim 10, wherein, The alkyl thickener is selected from one or more of the group consisting of alkyl-modified carboxyvinyl polymers, ammonium acryloyl dimethyl taurate / behenol polyether-25 methacrylate crosspolymers, and acrylate / stearyl alcohol polyether-20 methacrylate copolymers.

12. The composition according to any one of claims 1 to 11, wherein it is a cosmetic composition.

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