WO2013129482A1 - 経時安定性を有するw/o/w型エマルションおよびその製造方法 - Google Patents
経時安定性を有するw/o/w型エマルションおよびその製造方法 Download PDFInfo
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- A—HUMAN NECESSITIES
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- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/92—Oils, fats or waxes; Derivatives thereof, e.g. hydrogenation products thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
- A61K8/04—Dispersions; Emulsions
- A61K8/06—Emulsions
- A61K8/066—Multiple emulsions, e.g. water-in-oil-in-water
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/23—Sulfur; Selenium; Tellurium; Compounds thereof
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- A—HUMAN NECESSITIES
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- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/31—Hydrocarbons
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/49—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds
- A61K8/4973—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds with oxygen as the only hetero atom
- A61K8/498—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds with oxygen as the only hetero atom having 6-membered rings or their condensed derivatives, e.g. coumarin
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- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/55—Phosphorus compounds
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
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- A61K8/67—Vitamins
- A61K8/676—Ascorbic acid, i.e. vitamin C
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- A—HUMAN NECESSITIES
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- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/67—Vitamins
- A61K8/678—Tocopherol, i.e. vitamin E
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- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
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- A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- A61K8/8152—Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers
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- A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
- A61K8/89—Polysiloxanes
- A61K8/891—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
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- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
- A61K8/89—Polysiloxanes
- A61K8/891—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
- A61K8/893—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone modified by an alkoxy or aryloxy group, e.g. behenoxy dimethicone or stearoxy dimethicone
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- A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
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- A61K8/891—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
- A61K8/894—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone modified by a polyoxyalkylene group, e.g. cetyl dimethicone copolyol
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- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
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- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/92—Oils, fats or waxes; Derivatives thereof, e.g. hydrogenation products thereof
- A61K8/927—Oils, fats or waxes; Derivatives thereof, e.g. hydrogenation products thereof of insects, e.g. shellac
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- A—HUMAN NECESSITIES
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- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
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- A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
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- A61K2800/59—Mixtures
- A61K2800/592—Mixtures of compounds complementing their respective functions
Definitions
- the present invention relates to a W / O / W emulsion and a method for producing the same. More specifically, the present invention relates to a W / O / W type emulsion having a temporal stability and containing a water-soluble active ingredient in an inner aqueous phase, and a method for producing the same.
- the W / O / W type emulsion is a multiphase emulsion in which W / O type liquid droplets are dispersed in an outer aqueous phase, and can improve the transdermal absorbability of an active ingredient as compared with other emulsion types. It is known as a technology (Non-Patent Document 1) and is expected to be applied to various uses such as cosmetics, foods, and pharmaceuticals.
- a W / O / W emulsion is a thermodynamically unstable system, so if it is left for a long time, it will be separated and broken by coalescence through creaming and agglomeration. It is known that it will not return to an emulsion.
- W / O / W emulsions For example, as a W / O / W emulsion containing an ascorbic acid derivative as an active ingredient, a W / O emulsion in which a water-soluble active ingredient is dispersed in an inner aqueous phase using a dextrin fatty acid ester is prepared.
- Patent Document 1 A method of dispersing and emulsifying in an outer aqueous phase containing an acid alkyl copolymer (Patent Document 1), an W / O emulsion prepared by blending an electrolyte in an inner aqueous phase and emulsifying with a specific emulsifier, A method (Patent Document 2) in which an alkyl-modified carboxyvinyl polymer is dispersed in an outer aqueous phase is known.
- cosmetic products are exposed to extremely strict conditions in the distribution stage and the consumer use stage, so it is necessary to investigate multifaceted stability such as changes in physical properties of products and chemical changes in the active ingredients to be blended. It is. Also, consumers are most interested in the usefulness of the product, and in developing cosmetics, the usability of the product (feeling of use, ease of use, palatability, etc.) and functionality (moisturizing effect, whitening effect) , Anti-aging effect, anti-aging effect, etc.) must be satisfied.
- JP 2004-307414 A Patent No. 42823578
- JP 2002-275029 A Patent No. 4601031
- a W / O / W type emulsion satisfying quality for each element of stability and usefulness is required.
- development of techniques for improving the stability over time of a W / O / W emulsion, the stability of an active ingredient having a whitening effect, and skin permeability is expected.
- an object of the present invention is to provide a W / O / W type emulsion having a temporal stability containing a water-soluble active ingredient in an inner aqueous phase and a method for producing the same.
- the present inventors have included a solid oil component and a silicone surfactant in the oil phase, and a water-soluble polymer in the outer aqueous phase, thereby providing a W / O / W emulsion.
- a solid oil component and a silicone surfactant in the oil phase
- a water-soluble polymer in the outer aqueous phase
- W / O / W type mold emulsions and its manufacturing method.
- W / O / W emulsion containing a water-soluble active ingredient in the inner aqueous phase, containing a solid oily component and a silicone surfactant in the oil phase, and a water-soluble polymer in the outer water phase The W / O / W type emulsion.
- the silicone surfactant is a silicone surfactant having a polyether group and an alkyl group.
- the method for producing a W / O / W emulsion according to (14), wherein the inner water phase and the oil phase are mixed in a weight ratio of inner water phase / oil phase 10/90 to 90/10. .
- the present invention provides a W / O / W emulsion containing a water-soluble active ingredient in an inner aqueous phase and having stability over time, and a method for producing the same.
- the W / O / W emulsion of the present invention can be applied to cosmetic preparation techniques having various functions such as a whitening effect.
- FIG. 1 shows an optical micrograph ( ⁇ 400) of a W / O / W emulsion (1) which is an embodiment of the present invention.
- FIG. 2 shows a transmission electron microscope (TEM) photograph of a W / O / W emulsion (1) which is one embodiment of the present invention.
- FIG. 3 shows the particle size distribution of the W / O emulsion contained in the W / O / W emulsion that is one embodiment of the present invention.
- FIG. 4 shows the change over time of the particle diameter of the W / O type emulsion contained in the W / O / W type emulsion using the silicone surfactant that is one embodiment of the present invention.
- FIG. 5 shows the results of a permeability comparison test using a cultured skin model between a W / O / W emulsion according to one embodiment of the present invention and a conventional O / W emulsion.
- W / O / W type emulsion of the present invention is a W / O / W type emulsion containing a water-soluble active ingredient in an inner aqueous phase, wherein the oil phase contains a solid oil component and a silicone-based interface.
- the water-soluble polymer is contained in the active agent and the outer water phase. Since it is excellent in stability of the W / O / W emulsion of the present invention and has long-term storage stability, it is particularly useful in the field of cosmetics and the like.
- the “inner water phase”, “oil phase” and “outer water phase” in the present invention are the phases of the W / O / W emulsion and the phases used for the production of the W / O / W emulsion. Any of the respective solutions containing the respective components may be meant.
- ⁇ Inner water phase component> As an internal water phase component, various water-soluble active ingredients can be contained, and these are not particularly limited.
- Some water-soluble active ingredients such as ascorbic acid derivatives, have the effect of lowering viscosity, and such ingredients generally make W / O / W emulsions unstable, In the present invention, since a plurality of techniques for stabilizing a W / O / W emulsion are employed, storage stability can be maintained regardless of the type of active ingredient.
- vitamin C derivatives known as whitening ingredients, arbutin, ellagic acid, chamomile ET, t-AMCHA, tranexamic acid, placenta extract, linoleic acid, lucinol , Hydroquinone, astaxanthin and the like.
- component which has the anti-aging effect illustrated below, a plant extract, and another beauty component are mentioned.
- the ascorbic acid derivative which is one of the water-soluble active ingredients is not particularly limited as long as it is a known derivative in the field of ordinary cosmetics.
- ascorbic acid phosphate ester, ascorbic acid glucoside and salts thereof, ascorbic acid Glycosides are preferred, and ascorbyl magnesium phosphate is particularly preferred.
- the content of the water-soluble active ingredient is not particularly limited, but is, for example, 0.0001 to 50% by weight, preferably 0.005 to 20% by weight, and more preferably 0.001 to 10% by weight.
- a metal salt such as magnesium sulfate can be further contained as an inner aqueous phase component.
- the metal salt is not particularly limited, but amino acid salts such as magnesium sulfate, sodium citrate and sodium glutamate, sodium lactate and sodium chloride are preferable, and magnesium sulfate is particularly preferable.
- the content of the metal salt is not particularly limited, but is, for example, 0.001 to 50% by weight, preferably 0.01 to 10% by weight, and more preferably 0.1 to 5% by weight.
- ⁇ Oil phase component> By containing a solid oil component as the oil phase component, the viscosity of the oil phase can be increased and the fluidity of the inner aqueous phase can be decreased.
- the solid oil component is not particularly limited, but is selected from solid oils and fats, waxes, hydrocarbons, higher fatty acids, higher alcohols, esters, silicones and the like, and solid oils and waxes are particularly preferable.
- Solid fats and oils include cacao butter, palm oil, palm oil, palm kernel oil, hardened oil, hardened castor oil, mole and shea butter, and waxes include microcrystalline wax, beeswax, carnauba wax, and candelilla wax. Lanolin, jojoba oil and the like, and microcrystalline wax is particularly preferable.
- the content of the solid oil component is not particularly limited, but is, for example, 0.001 to 50% by weight, preferably 0.01 to 50% by weight, more preferably 0.1 to 50% by weight. In such a case, it is 0.001 to 50% by weight, preferably 0.01 to 10% by weight, and more preferably 0.1 to 5% by weight.
- the silicone-based surfactant that is a part of the oil phase component of the present invention is a surfactant having a structure in which a hydrophilic substituent is introduced into silicone, and by changing the type of the hydrophilic substituent, Surfactants suitable for various applications can be obtained.
- it is not particularly limited as long as it is a silicone-based surfactant.
- a polyether-modified silicone surfactant having a polyether as a substituent is preferable, and a silicone-based surfactant having a polyether group and an alkyl group is preferable.
- An agent is more preferable.
- silicone surfactants having a polyether group examples include PEG-11 methyl ether dimethicone, PEG / PPG-20 / 22 butyl ether dimethicone, PEG-9 dimethicone, PEG-3 dimethicone, PEG-9 methyl ether dimethicone, PEG-10.
- silicone surfactant having a polyether group and an alkyl group examples include lauryl or cetyl dimethicone copolyol, and particularly include cetyl PEG / PPG-10 / 1 dimethicone, lauryl PEG-9, polydimethylsiloxyethyl dimethicone, and the like. .
- the silicone surfactants can be used in combination.
- the silicone surfactant preferably has an HLB value of 7 or less, more preferably 6 or less, and even more preferably 2.5 to 5.5.
- the content of the silicone surfactant is, for example, 0.1 to 15.0% by weight, preferably 0.5 to 12.5% by weight, and more preferably 1.0 to 10.0% by weight.
- an oil-soluble active ingredient can be optionally contained, and the kind thereof is not particularly limited.
- a cosmetic having both functions derived from the water-soluble active ingredient and the oil-based active ingredient can be produced.
- mold emulsion of this invention can contain the component which has the anti-aging effect illustrated below, a plant extract, and other cosmetic ingredients as an oil-soluble active ingredient.
- the content of the oil-soluble active ingredient is, for example, 0.0001 to 50% by weight, preferably 0.0005 to 20% by weight, and more preferably 0.001 to 10% by weight.
- the outer water phase component contains a water-soluble polymer known as a thickener. Since the water-soluble polymer increases the viscosity of the outer aqueous phase and lowers the fluidity of the W / O emulsion, it is effective for preventing aggregation of the W / O emulsions.
- the water-soluble polymer used in the present invention is not particularly limited, and known water-soluble polymers can be used.
- natural water-soluble polymers such as arabia gum, guar gum, carrageenan, pectin, agar, quince seed (quince), starch (rice, corn, potato, wheat), glycyrrhizic acid; xanthan gum, dextran
- microbial polymers such as bullulan; animal polymers such as collagen, casein, albumin, and gelatin.
- semi-synthetic water-soluble polymers include starch polymers such as carboxymethyl starch and methylhydroxypropyl starch; methylcellulose, nitrocellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, sodium carboxymethylcellulose (CMC), crystalline cellulose, Cellulose polymers such as cellulose powder; and alginic acid polymers such as sodium alginate and propylene glycol alginate.
- Examples of the synthetic water-soluble polymer include vinyl polymers such as polyvinyl alcohol, polyvinyl methyl ether, and carboxyvinyl polymer (carbomer); polyoxyethylene polymers such as polyethylene glycol (molecular weight 1500, 4000, 6000); Examples include oxyethylene polyoxypropylene copolymer copolymer polymers; acrylic polymers such as sodium polyacrylate, polyacrylamide, and acrylic acid / alkyl methacrylate copolymers; polyethyleneimine, cationic polymers, and the like.
- the W / O / W emulsion of the present invention preferably contains an alkyl methacrylate copolymer or xanthan gum.
- the acrylic acid / methacrylic acid alkyl copolymer is not particularly limited, but preferably has a molecular weight of 500,000 to 3,000,000 and an alkyl group having 10 to 30 carbon atoms.
- the content of the water-soluble polymer is, for example, 0.001 to 50% by weight, preferably 0.005 to 20% by weight, and more preferably 0.01 to 10% by weight.
- components in the outer aqueous phase are not particularly limited, but may contain components known to contribute to the stability of the emulsion, for example, may further contain a polyoxyethylene-based activator.
- the polyoxyethylene activator is not particularly limited, but polyoxyethylene sorbitan monooleate or the like can be used.
- the content of the polyoxyethylene-based activator is, for example, 0.01 to 50% by weight, preferably 0.1 to 20% by weight, and more preferably 1 to 10% by weight.
- the W / O / W emulsion of the present invention is a variety of components used in normal cosmetics, quasi drugs, pharmaceuticals, etc., such as water, oily components, emulsifiers, humectants, thickeners. , Active ingredients, preservatives, pigments, powders, pH adjusters, ultraviolet absorbers, antioxidants, fragrances and the like can be contained as appropriate.
- the W / O / W emulsion of the present invention can contain, as a water-soluble active ingredient and an oil-soluble active ingredient, ingredients having an anti-aging effect, plant extracts, and other cosmetic ingredients.
- the anti-aging component examples include collagen, hyaluronic acid, elastin, proteoglycan, ceramide, placenta, astaxanthin, polyphenol, yeast, amino acid and the like.
- the anti-aging component may be contained in any of the inner aqueous phase, oil phase, and outer aqueous phase, but collagen, hyaluronic acid, elastin, proteoglycan, placenta, polyphenol, yeast, and amino acid may be contained in the inner aqueous phase.
- ceramide and astaxanthin are contained in the oil phase.
- Plant extracts include, for example, Ai (blue leaves), red grapes, red slashed sardines (Asian yellow), Asa (Asakojin), Ashitaba, Azuki, Acerola, Asenyaku, avocado, Ama, Achacha, Achacharu, Altea, Arnica, Aloe, Aloe vera , Apricot honanzu, strawberry, fig or its leaf, ginkgo (ginkgo leaf, ginkgo), rice seed or seed coat, nettle, ylang ylang, turmeric, euglena, euglena, ume (plum), or its flesh , Oolong tea, Citrus unshiu (Chest), Ezokogi, Ezo strawberry, Enokitake, Ebisugusa (Keiko), Elderberry fruit, Enju (Safflower, Satsuma rice), Ogi, Kibanaougi, Ouren, Psyllium (pre-cursor, frontal grass), Omi
- cosmetic ingredients include Saccharomyces, hydrolyzed conchiolin, hydrolyzed hyaluronic acid, hydroxypropyltrimonium hyaluronate, hydrolyzed alkyl hyaluronate (C12-13) glyceryl and the like. These components may also be contained in any of the inner aqueous phase, the oil phase, and the outer aqueous phase, but it is particularly preferable to contain these components in the outer aqueous phase.
- the content of the components in each phase relative to the total amount of the W / O / W emulsion can be appropriately determined according to the active ingredient, the type of surfactant, the type and amount of the solid oil component, and the like.
- the blending ratio of the inner water phase, the oil phase, and the outer water phase can be appropriately determined according to the type and amount of the component to be used, similarly to the content of the component.
- the oil phase is 10 to 500 parts by weight, preferably 20 to 300 parts by weight, more preferably 50 to 200 parts by weight
- the outer aqueous phase is 50 to 2000 parts by weight with respect to 100 parts by weight of the inner aqueous phase.
- the amount is preferably 100-1500 parts by weight, more preferably 200-1000 parts by weight.
- the form of the W / O / W type emulsion in the present invention is not particularly limited as long as it has aging stability.
- the average particle diameter of the inner aqueous phase droplets is 0.001 to 100 ⁇ m, preferably 0.01 to 100 ⁇ m, more preferably 0.1 to 100 ⁇ m
- the W / O emulsion average particle size is 0.01 to 100 ⁇ m, preferably 0.1 to 100 ⁇ m, more preferably 0.5 to 100 ⁇ m.
- the thickness is 1 to 50 ⁇ m.
- the viscosity of the W / O / W emulsion in the present invention is preferably in the range of 500 to 50,000 mPa ⁇ s at 20 to 30 ° C., more preferably 1,000 to 40,000 mPa ⁇ s, and 2,000 to 30,000. 000 mPa ⁇ s is more preferable.
- the viscosity is a viscosity measured with a BM viscometer (manufactured by TOKI SANGYO, measurement conditions: rotor No. 4, 12 rpm, 1 minute).
- Skin external preparation refers to a dosage form that can be administered to the skin.
- the use of the external preparation for skin of the present invention is not particularly limited as long as it is a known use to which an emulsion can be applied, but cosmetics are preferable, and among them, cream is more preferable.
- Production method of W / O / W type emulsion The production method of the W / O / W type emulsion in the present invention is not particularly limited and can be produced by a known method. A W / O / W emulsion having excellent stability can be obtained.
- the production of a W / O / W type emulsion comprises the following two steps: (1) mixing an inner aqueous phase containing a water-soluble active ingredient and an oil phase containing a solid oily ingredient and a silicone surfactant.
- the step of preparing a W / O type emulsion by emulsifying and the step of (2) mixing and emulsifying the prepared W / O type emulsion and an external aqueous phase containing a water-soluble polymer. it can.
- an oil phase containing a silicone-based surfactant, a solid oily component, and other optional components contains a water-soluble active component and other optional components (metal salts, etc.).
- An inner aqueous phase is added and emulsified at an emulsification temperature of 50 to 100 ° C., preferably 65 to 95 ° C., more preferably 75 to 85 ° C. to prepare a W / O type emulsion.
- a W / O type emulsion is added to the outer aqueous phase in which the alkyl methacrylate copolymer is blended, and the emulsification temperature is 70 ° C. or less, preferably 0 to 60 ° C., more preferably 10 to 50 ° C.
- a W / O / W type emulsion is prepared by emulsification.
- Example 1 Preparation 1 of W / O / W type emulsion> First, each component was mixed by the compounding ratio (weight ratio) of Table 1, and the oil phase, the inner water phase, and the outer water phase were prepared. Cetyl PEG / PPG-10 / 1 dimethicone was used as the silicone surfactant to be blended in the oil phase. Next, a W / O type emulsion was prepared by charging and emulsifying the inner aqueous phase into the oil phase at a temperature of 80 ° C. Thereafter, the W / O type emulsion was added to the outer aqueous phase under the condition of 50 ° C. to obtain the W / O / W type emulsion preparation of the evaluation sample (1).
- evaluation sample (1) which is a W / O / W type emulsion of the present invention using a silicone surfactant with a sample using another surfactant
- evaluation samples (2) to (7) were produced using the same components and conditions as in (1).
- ⁇ Preparation 2 of W / O / W type emulsion> Except for the component ratios shown in Table 1, the same conditions as in the evaluation sample (1) were adopted to produce an evaluation sample (8) according to the W / O / W emulsion of the present invention containing a silicone surfactant.
- evaluation samples (9) to (11) in which various dextrin palmitates were employed as surfactants instead of silicone surfactants were produced.
- mold emulsion which uses a silicone type surfactant is shown in FIG. From FIG. 4, it was confirmed that the W / O / W emulsion (1) maintained its stability since no change in the particle diameter was observed even after 6 months. That is, from the results of FIG. 4, it was clarified that the W / O type emulsion contained in the W / O / W emulsion of the present invention has a constant particle size for 6 months or more and is very stable. .
- the skin absorbability of the active ingredient (tocophenol acetate) blended in the oil phase of the W / O / W emulsion was greatly improved as compared with the O / W type. From this result, since it is considered that the water-soluble active ingredient blended in the inner aqueous phase dispersed in the oil phase is also absorbed at the same time, by using the W / O / W type emulsion of the present invention, It is presumed that the skin absorbability of the inner aqueous phase component is similarly improved.
- Example 2 ⁇ Stability evaluation of W / O / W type emulsion: examination of content of solid oil component> Table 3 shows the results of a comparative study of the stability of W / O / W emulsions by changing the content of the solid oil component (microcrystalline wax).
- the evaluation samples (12) to (16) were prepared using the same conditions as the evaluation sample (1) of Example 1 except that the content of the microcrystalline wax was changed. By the same method, the stability of the emulsion preparation was evaluated using the appearance and fragrance as an index.
- Example 3 ⁇ Stability evaluation of W / O / W type emulsion: Examination of water-soluble polymer> A comparative study was conducted on whether or not the water-soluble polymer in the outer water phase contributes to the stability of the W / O / W emulsion. An evaluation sample (17) was prepared using the same conditions as in the evaluation sample (1) of Example 1 except that purified water was used in place of the acrylates / alkyl acrylate crosspolymer. Further, it was examined whether the stability of the W / O / W emulsion is maintained even when different types of water-soluble polymers are used.
- An evaluation sample (18) was prepared by employing the same conditions as in the evaluation sample (1) of Example 1 except that xanthan gum was used instead of the acrylates / alkyl acrylate crosspolymer. Except that these prepared evaluation samples were evaluated one month after the preparation of the emulsion, the stability of the emulsion preparation was evaluated using the appearance and fragrance as an index by the same method as the stability evaluation method of Example 1.
- the evaluation result of the evaluation sample (17) is x (changed) in both appearance and fragrance, and when the water-soluble polymer is not contained in the outer aqueous phase, stable W / O / It became clear that a W-type emulsion could not be obtained.
- the evaluation result of the evaluation sample (18) is ⁇ (no change) in both appearance and fragrance, and even when xanthan gum is used as the water-soluble polymer, a stable W / O / W emulsion is obtained.
- the water-soluble polymer effectively suppresses the aggregation of the W / O emulsions by increasing the viscosity of the outer water phase and lowering the fluidity of the W / O emulsions. It is thought that it contributes greatly to the stability of
- Example 4 ⁇ Stability evaluation of W / O / W type emulsion: Examination of silicone surfactant> A comparative study was conducted as to whether or not the type of the silicone surfactant affects the stability of the W / O / W emulsion.
- An evaluation sample (19) was prepared using the same conditions as in the evaluation sample (1) of Example 1 except that the type of the silicone surfactant was changed.
- lauryl PEG-9 polydimethylsiloxyethyl dimethicone which is a silicone surfactant having a polyether group and an alkyl group, was used as in the evaluation sample (1). Except that these prepared evaluation samples were evaluated one month after the preparation of the emulsion, the stability of the emulsion preparation was evaluated using the appearance and fragrance as an index by the same method as the stability evaluation method of Example 1.
- the evaluation sample (19) is ⁇ (no change) in both appearance and fragrance, and among silicone surfactants, a silicone surfactant having a polyether group and an alkyl group is used. In this case, it was confirmed that a stable W / O / W emulsion was obtained.
- the HLB of cetyl PEG / PPG-10 / 1 dimethicone used for the evaluation is about 5.0
- the HLB of lauryl PEG-9 polydimethylsiloxyethyl dimethicone is about 3.0.
- the cream was filled in a container with a cap and stored tightly sealed at 25 ° C., and stability evaluation was performed under the same conditions as the above-described stability evaluation for the emulsion obtained in Example 1.
- the appearance and fragrance of the cream did not change for 3 months, confirming the stability of the functional cream over time.
- the present invention it is possible to provide a W / O / W emulsion containing a water-soluble active ingredient in the inner aqueous phase and having stability over time, and a method for producing the same. Moreover, the W / O / W type emulsion and the method for producing the same of the present invention can be applied to cosmetic preparation techniques having various functions such as a whitening effect.
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Abstract
Description
(1)内水相に水溶性有効成分を含むW/O/W型エマルションであって、油相に固形油性成分およびシリコーン系界面活性剤を含有し、外水相に水溶性高分子を含有する、上記W/O/W型エマルション。
(2)前記シリコーン系界面活性剤が、ポリエーテル基およびアルキル基を持つシリコーン系界面活性剤である、(1)に記載のW/O/W型エマルション。
(3)前記ポリエーテル基およびアルキル基を持つシリコーン系界面活性剤が、ラウリルPEG-9ポリジメチルシロキシエチルジメチコンまたはセチルPEG/PPG-10/1ジメチコンである、(2)に記載のW/O/W型エマルション。
(4)前記シリコーン系界面活性剤のHLB値が7以下である、(1)~(3)のいずれかに記載のW/O/W型エマルション。
(5)前記固形油性成分の含有量が、0.7重量%以上である、(1)~(4)のいずれかに記載のW/O/W型エマルション。
(6)前記固形油性成分がワックスである、(1)~(5)のいずれかに記載のW/O/W型エマルション。
(7)前記水溶性高分子がアクリル酸メタクリル酸アルキル共重合体またはキサンタンガムである、(1)~(6)のいずれかに記載のW/O/W型エマルション。
(8)前記内水相に、金属塩をさらに含有する、(1)~(7)のいずれかに記載のW/O/W型エマルション。
(9)前記水溶性有効成分がアスコルビン酸誘導体である、(1)~(8)のいずれかに記載のW/O/W型エマルション。
(10)前記内水相と前記油相が、内水相/油相=10/90~90/10の重量比である、(1)~(9)のいずれかに記載のW/O/W型エマルション。
(11)前記油相に、油溶性有効成分をさらに含有する、(1)~(10)のいずれかに記載のW/O/W型エマルション。
(12)前記油溶性有効成分が、トコフェロール誘導体である、(1)~(11)のいずれかに記載のW/O/W型エマルション。
(13)皮膚外用剤である、(1)~(12)のいずれかに記載のW/O/W型エマルション。
(14)水溶性有効成分を含有する内水相と、固形油性成分およびシリコーン系界面活性剤を含有する油相を混合し、乳化させることでW/O型エマルションを調製する工程と、
調製したW/O型エマルションと、水溶性高分子を含有する外水相とを混合し、乳化させる工程と、
を含む、W/O/W型エマルションの製造方法。
(15)前記内水相と前記油相を、内水相/油相=10/90~90/10の重量比で混合する、(14)に記載のW/O/W型エマルションの製造方法。
W/O/W型エマルション
本発明のW/O/W型エマルションは、内水相に水溶性有効成分を含むW/O/W型エマルションであって、油相に固形油性成分およびシリコーン系界面活性剤、外水相に水溶性高分子を含有することを特徴とする。本発明のW/O/W型エマルション安定性に優れ、長期保存安定を有することから、化粧品などの分野で特に有用である。
〈内水相成分〉
内水相成分としては、各種水溶性有効成分を含有することができ、これらは特に限定されない。水溶性有効成分の中には、アスコルビン酸誘導体等のように粘度を低下させる作用を有するものが存在し、そのような成分はW/O/W型エマルションを一般的に不安定にするが、本発明においてはW/O/W型エマルションを安定化させる技術を複数採用していることから、有効成分の種類にかかわらず保存安定性を維持することができる。
〈油相成分〉
油相成分として固形油性成分を含有することで、油相の粘度を高め、内水相の流動性を下げることができる。固形油性成分は特に限定されないが、固形油脂類、ロウ類、炭化水素類、高級脂肪酸類、高級アルコール類、エステル類、シリコーン類等から選択され、特に、固体油脂類やロウ類が好ましい。固体油脂としては、カカオ脂、ヤシ油、パーム油、パーム核油、硬化油、硬化ヒマシ油、モクロウ、シアバター等が挙げられ、ロウ類としては、マイクロクリスタリンワックス、ミツロウ、カルナウバロウ、キャンデリラロウ、ラノリン、ホホバ油等が挙げられるが、特に、マイクロクリスタリンワックスが好ましい。
〈外水相成分〉
外水相成分としては、増粘剤として知られる水溶性高分子を含有する。水溶性高分子が外水相の粘度を高めてW/O型エマルションの流動性を下げることから、W/O型エマルション同士の凝集を防ぐために有効である。
〈その他〉
本発明のW/O/W型エマルションは、上記成分の他に、通常の化粧品、医薬部外品、医薬品等に用いられる各種成分、例えば、水、油性成分、乳化剤、保湿剤、増粘剤、有効成分、防腐剤、顔料、粉体、pH調製剤、紫外線吸収剤、抗酸化剤、香料等を適宜含有することができる。
植物エキスとしては、例えば、アイ(藍葉)、アカブドウ、アカヤジオウ・ジオウ(地黄)、アサ(麻子仁)、アシタバ、アズキ、アセロラ、アセンヤク、アボカド、アマ、アマチャ、アマチャヅル、アルテア、アルニカ、アロエ、アロエベラ、アンズ・ホンアンズ(杏仁)、イチゴ、イチジク又はその葉、イチョウ(銀杏葉、銀杏)、イネ種子又は種皮、イラクサ、イランイラン、ウコン、ウスベニアオイ、ウスベニタチアオイ、ウツボグサ、ウメ(烏梅)又はその果肉、ウーロン茶、ウンシュウミカン(陳皮)、エゾウコギ、エゾキイチゴ、エノキタケ、エビスグサ(決明子)、エルダーベリー果実、エンジュ(槐花、槐花米)、オウギ・キバナオウギ、オウレン、オオバコ(車前子、車前草)、オオミサンザシ・サンザシ、オウヒササノユキ、オオムギ、オクラ果実、オタネニンジン・トチバニンジン(人参)、オトギリソウ・コゴメバオトギリソウ・セイヨウオトギリソウ、オドリコソウ(続断)、オニグルミ、オニユリ・ササユリ・ハカタユリ(百合)、オノニス、オヒョウ、オランダイチゴ、オランダカラシ(クレソン)、オランダゼリ、オランダミツバ、オリーブ、オレガノ、オレンジ果実又は果皮、カイケイジオウ(熟地黄)、カカオ種子、カキ又はその葉(柿蒂)、ガジュツ、カシワ(槲樹、槲葉)、カバノキ又はシダレカンバ、カボチャ、ガマ、カミツレ・ローマカミツレ、ガラナ種子、カリン、ガルシニア、カワヤナギ、カワラタケ、カワラヨモギ、カンゾウ、カンタラアサ、カントウ、カンナ、キイチゴ、キウイ果実、キク(菊花)、キササゲ、ギシギシ、キジツ、キズタ、キダチアロエ、キダチハッカ、キナ、キナノキ(シンコーナ、アカキナノキ)、キャベツ、キャベブ未熟果、キュウリ、キンカン果実、キンマ、グアバ果実、グアユーレ、クェルクス・インフェクトリア(没食子)、ククイナッツ、クコ(枸杞、枸杞子、枸杞葉、地骨皮)、クズ(葛根)、クスノキ、グースベリー果実、クチナシ、クマザサ、クマツヅラ、クララ、クランベリー果実、クリ又はその渋皮、グレープフルーツ、クロバナヒキオコシ、ゲットウ(葉)、ゲッケイジュ、ゲンチアナ、ゲンチアナ根茎/根、コウチャ、コガネバナ(黄ゴン)、コケモモ、コショウ、コーヒー豆、ゴボウ(牛蒡、牛蒡子)、ゴマ、ゴマノハグサ、ゴミシコムギ、米・米糠(赤糠、白糠)・コメ油・加水分解コメエキス、コンニャク、サクラ(オオシマザクラ、ヤマザクラ、オオヤマザクラ、エドヒガシ、マメザクラ、ミヤマザクラ、ソメイヨシノ、タカネザクラ、カスミザクラ、チョウジザクラ、コヒガン、サトザクラ、カンザクラ)の葉・花・果実・樹皮(桜皮)、サクランボ、ザクロ、サツマイモ、サトウキビ、サトウダイコン、サルビア(セージ)、サンショウ、シア(カリテ)、シイタケ、シオン、シソ・アオジソ・チリメンジソ・カタメンジソ(紫蘇葉、紫蘇子)、シナノキ、ハタケシメジ、ブナシメジ、シロタモギタケ、シモツケソウ、ジャガイモ、シャクヤク、シャクヤク根、ショウガ、ショウブ(菖蒲、菖蒲根)、シロバナイリス、シロバナツタの花、スイカ、スイカズラ(金銀花、忍冬)、ステビア、ストロベリー果実、スギナ、ステビア、スモモ果実、セイヨウアカマツの球果、セイヨウカラマツ、セイヨウキズタ、セイヨウグルミ、セイヨウサンザシ、セイヨウタンポポ、セイヨウトチノキ(マロニエ)、セイヨウナシ(果実、枝)、セイヨウナツユキソウ、セイヨウノコギリソウ(ミルフォイル)、セイヨウバラ、セイヨウハッカ・セイヨウヤマハッカ、ゼニアオイ、セリ、セロリ、センキュウ、センブリ、ソバ種実、ダイオウ、大根、大豆、ダイダイ(橙皮、枳実)、タチジャコウソウ(タイム、ワイルドタイム、百里香)、ダマスクバラ(花)、タマネギ、タムシバ(辛夷)、タラノキ又はその根皮、タンジン、タンポポ又はシロバナタンポポ・モウコタンポポ、チェリー果実、チョウセンニンジン(人参)、ツキミソウ、ツバキ、ツボクサ、ツユクサ、ツルアズキ、ツルドクダミ、デュベリー果実、トウガン(冬瓜子)、トウガラシ、トウキ、トウキンセンカ(マリーゴールド)、トウモロコシ又はトウモロコシ毛、ドクダミ、トコン(吐根)、トチュウ(杜仲、杜仲葉)、トマト、トルメンチラ、ナガイモ・ヤマノイモ、ナツミカン、ナツメ、ナンキンマメ、ナンテン(南天実)、ニクズク、ケイ・ニッケイ(桂皮)・ケイシ、ニラ、ニンニク、ノイバラ(営実)、ノコギリソウ、ノバラ、ノモモ、パーム、パイナップル果実、バジル、ハス(蓮肉、蓮子)、パセリ(オランダゼリ)、ハッカ(薄荷、薄荷葉)、ハトムギ(ヨクイニン)、バナナ、ハナハッカ、バニラビンズ、パパイヤ、パプリカ、ハマメリス(葉)、バラ、ヒオウギ、ヒキオコシ(延命草)、ヒシ(菱実)、ヒノキ、ヒマシ、ヒマワリ、ピーマン、ビワ(枇杷、枇杷葉)、ビンロウ(大服皮、檳榔子)、フキ、フキタンポポ(款冬花、款冬葉)、ブドウ果実又は果皮・種子・葉、ブナ、フユムシナツクサタケ、ブラジルカンゾウ、ブラックベリー、プラム果実、ブルーベリー(セイヨウヒメスノキ)、プルーン、ヘチマ、ベニバナ(紅花)、ベリー果実、ベルゲニアリグラタ(根)、ホウレンソウ、ホオズキ(登呂根)、ボダイジュ、ボタン(牡丹、牡丹皮)、ホップ、ホホバ、マイタケ、マオウ、マカデミアナッツ、マグワ(桑白皮、桑葉)、マヨラナ(葉)、マルベリー果実、マルメロ、マンゴー、マンゴスチン、マンダリン果実、マンネンタケ、ミドリハッカ、ミモザ、ミョウガ、ミラクルフルーツ果実、ムクロジ、ムラサキ(紫根)、ムラサキトウモロコシ、メリアアザジラクタ(葉)、メリッサ、メリロート、メロン果実、モモの葉(桃葉)・果実・種(桃仁)、モヤシ、モレロチェリー果実、モロヘイヤ、ヤグルマソウ(ヤグルマギク)、ヤグルマハッカ、ヤマヨモギ、 ユーカリ、ユキノシタ、ユズ果実、ユリ、ヨーロッパキイチゴ、ヨモギ(艾葉)、ライム果実、ライムギ、ラズベリー葉・果実、ラベンダー、リョクチャ、リンゴ果実、リンドウ、レモン果実、レモングラス、レンギョウ、レンゲソウ、ローズマリー(マンネンロウ)、ローズヒップ(ノバラ)、ワサビ、ワレモコウ等が挙げられる。植物エキスは、内水相、油相、外水相のいずれに含有させてもよいが、特に外水相に含有させることが好ましい。
皮膚外用剤
本発明でいう「皮膚外用剤」とは、皮膚に投与し得る剤形のものであって、クリーム、美容液、乳液、化粧水、パック料等の化粧料のほか、医薬部外品、医薬品、洗浄剤等の総称を表す。本発明の皮膚外用剤の用途は、エマルションを適用し得るものとして公知の用途であれば特に限定されるものではないが、化粧料が好ましく、その中でもクリームがさらに好ましい。
W/O/W型エマルションの製造方法
本発明におけるW/O/W型エマルションの製造方法については特に限定されず、公知の方法によって製造できるが、以下の製造方法により調製することで、特に経時安定性の優れたW/O/W型エマルションが得られる。
実施例1
〈W/O/W型エマルションの調製1〉
まず、各成分を表1の配合比(重量比)で混合し、油相、内水相、外水相を調製した。油相に配合されるシリコーン系界面活性剤としては、セチルPEG/PPG-10/1ジメチコンを使用した。つぎに、80℃の温度下で油相に内水相を投入して乳化させることでW/O型エマルションを調製した。その後、50℃の条件下にて外水相にW/O型エマルションを投入し、評価サンプル(1)のW/O/W型エマルション製剤を得た。
〈W/O/W型エマルションの調製2〉
表1に示される成分比以外は評価サンプル(1)と同様の条件を採用して、シリコーン系界面活性剤を含有する本発明のW/O/W型エマルションにかかる評価サンプル(8)を製造し、比較例として、シリコーン系界面活性剤に代えて各種パルミチン酸デキストリンを界面活性剤として採用した、評価サンプル(9)~(11)を製造した。
上記方法により得られた本発明のW/O/W型エマルション(評価サンプル(1))の顕微鏡写真を図1および図2に示す。図1および図2に示す写真により、内水相、油相、外水相からなるW/O/W型エマルションが作成できていることを確認した。
〈W/O/W型エマルションの安定性評価:界面活性剤の検討〉
製造したエマルション製剤の安定性の確認は、40℃、75%RHの加速条件下で、粒子径の測定、製剤の外観・香調を指標として行った。製剤の外観および香調の経時観察については6ヶ月経過後に評価を行い、その指標には下記の評価項目を用いた。
(外観評価項目)
○:変化なし
×:変化あり(分離が生じている)
(香調評価項目)
○:変化なし
×:変化あり(油の酸化臭や基剤臭がする)
種々の界面活性剤を使用した場合の製剤の経時的安定性について検討した結果を表2に示す。表2から、比較例として、シリコーン系界面活性剤以外の界面活性剤を使用した評価サンプル(2)~(7)の場合、安定なW/O/W型エマルションが得られないことが明らかとなった。特に、比較例として、置換度の異なるパルミチン酸デキストリンを使用した評価サンプル(9)~(11)では、各種デキストリン脂肪酸エステルを水溶性高分子や固形油性成分と組み合わせて使用した場合であっても安定なW/O/W型エマルションは形成されなかった。これらの結果から、シリコーン系界面活性剤に加えて、水溶性高分子や固形油性成分を含有する場合にW/O/W型エマルションが安定化されることが確認された。
〈培養皮膚モデルを用いた浸透性試験〉
(評価方法)
作成したW/O/W型エマルション(評価サンプル(1))の浸透性を確認するため、培養皮膚モデルを用いた浸透性試験を実施した。尚、比較サンプルには評価サンプル(1)と同じ原料を用いたO/W型エマルションを用いた。
(評価結果)
浸透性評価結果を、図5に示す。図5の結果から明らかなように、O/W型と比較して、W/O/W型エマルションの油相に配合した有効成分(酢酸トコフェノール)の皮膚吸収性は大幅に改善された。この結果から、油相中に分散されている内水相に配合される水溶性有効成分についても同時に吸収されていると考えられるため、本発明のW/O/W型エマルションを用いることにより、内水相成分の皮膚吸収性も同様に改善されていることが推測される。
実施例2
〈W/O/W型エマルションの安定性評価:固形油性成分の含有量の検討〉
固形油性成分(マイクロクリスタリンワックス)の含有量を変更して、W/O/W型エマルションの安定性の比較検討を行った結果を表3に示す。評価サンプル(12)~(16)は、マイクロクリスタリンワックスの含有量を変えたこと以外は実施例1の評価サンプル(1)と同様の条件を採用して調製し、実施例1の安定性評価方法と同じ方法により、エマルション製剤の安定性を外観・香調を指標として評価した。
〈W/O/W型エマルションの安定性評価:水溶性高分子の検討〉
外水相の水溶性高分子がW/O/W型エマルションの安定性に寄与するか否かについて比較検討を行った。アクリレーツ/アクリル酸アルキルクロスポリマーに代えて精製水を使用したこと以外は実施例1の評価サンプル(1)と同様の条件を採用して、評価サンプル(17)を調製した。また、異なる種類の水溶性高分子を使用した場合にもW/O/W型エマルションの安定性が維持されるか否かについて検討を行った。アクリレーツ/アクリル酸アルキルクロスポリマーに代えてキサンタンガムを使用したこと以外は実施例1の評価サンプル(1)と同様の条件を採用して、評価サンプル(18)を調製した。調製したこれらの評価サンプルをエマルション調製1ヶ月後に評価すること以外は、実施例1の安定性評価方法と同じ方法により、エマルション製剤の安定性を外観・香調を指標として評価した。
〈W/O/W型エマルションの安定性評価:シリコーン系界面活性剤の検討〉
シリコーン系界面活性剤の種類がW/O/W型エマルションの安定性に影響するか否かについて比較検討を行った。シリコーン系界面活性剤の種類変更したこと以外は実施例1の評価サンプル(1)と同様の条件を採用して、評価サンプル(19)を調製した。評価サンプル(19)には、評価サンプル(1)と同様にポリエーテル基およびアルキル基を持つシリコーン系界面活性剤であるラウリルPEG-9ポリジメチルシロキシエチルジメチコンを使用した。調製したこれらの評価サンプルをエマルション調製1ヶ月後に評価すること以外は、実施例1の安定性評価方法と同じ方法により、エマルション製剤の安定性を外観・香調を指標として評価した。
Claims (15)
- 内水相に水溶性有効成分を含むW/O/W型エマルションであって、油相に固形油性成分およびシリコーン系界面活性剤を含有し、外水相に水溶性高分子を含有する、上記W/O/W型エマルション。
- 前記シリコーン系界面活性剤が、ポリエーテル基およびアルキル基を持つシリコーン系界面活性剤である、請求項1に記載のW/O/W型エマルション。
- 前記ポリエーテル基およびアルキル基を持つシリコーン系界面活性剤が、ラウリルPEG-9ポリジメチルシロキシエチルジメチコンまたはセチルPEG/PPG-10/1ジメチコンである、請求項2に記載のW/O/W型エマルション。
- 前記シリコーン系界面活性剤のHLB値が7以下である、請求項1~3のいずれか1項に記載のW/O/W型エマルション。
- 前記固形油性成分の含有量が、0.7重量%以上である、請求項1~4のいずれか1項に記載のW/O/W型エマルション。
- 前記固形油性成分がワックスである、請求項1~5のいずれか1項に記載のW/O/W型エマルション。
- 前記水溶性高分子がアクリル酸メタクリル酸アルキル共重合体またはキサンタンガムである、請求項1~6のいずれか1項に記載のW/O/W型エマルション。
- 前記内水相に、金属塩をさらに含有する、請求項1~7のいずれか1項に記載のW/O/W型エマルション。
- 前記水溶性有効成分がアスコルビン酸誘導体である、請求項1~8のいずれか1項に記載のW/O/W型エマルション。
- 前記内水相と前記油相が、内水相/油相=10/90~90/10の重量比である、請求項1~9のいずれか1項に記載のW/O/W型エマルション。
- 前記油相に、油溶性有効成分をさらに含有する、請求項1~10のいずれか1項に記載のW/O/W型エマルション。
- 前記油溶性有効成分が、トコフェロール誘導体である、請求項1~11のいずれか1項に記載のW/O/W型エマルション。
- 皮膚外用剤である、請求項1~12のいずれか1項に記載のW/O/W型エマルション。
- 水溶性有効成分を含有する内水相と、固形油性成分およびシリコーン系界面活性剤を含有する油相を混合し、乳化させることでW/O型エマルションを調製する工程と、
調製したW/O型エマルションと、水溶性高分子を含有する外水相とを混合し、乳化させる工程と、
を含む、W/O/W型エマルションの製造方法。 - 前記内水相と前記油相を、内水相/油相=10/90~90/10の重量比で混合する、請求項14に記載のW/O/W型エマルションの製造方法。
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