JP2020090454A - High internal phase W/O type emulsion composition and cosmetics using the same - Google Patents

Abstract

An object of the present invention is to use a polyglycerin fatty acid ester as an emulsifier, and to stably maintain an emulsified state even when a water-soluble active ingredient such as a lactic acid fermented extract is added. To provide an O-type emulsion composition and cosmetics using the same. [Solution] A W/O emulsification comprising (A) an emulsifier, (B) an oil, (C) water, and (D) a water-soluble active ingredient, wherein the water phase accounts for 70% by mass or more. A high internal phase W/O type composition, wherein (A) an emulsifier comprises a polyglycerin fatty acid ester, and the composition further comprises (E) a monoalcohol and/or a polyhydric alcohol. It is an emulsion composition. (E) the monoalcohol and/or polyhydric alcohol is one or two selected from the group consisting of monoalcohols having 2 to 6 carbon atoms, polyhydric alcohols having 2 to 6 carbon atoms, and polyoxypropylene diglyceryl ether It preferably contains more than one species. [Selection figure] None

Description

The present invention relates to an emulsion composition suitable for application to cosmetics and the like, and more particularly to a W/O type emulsion composition in which an aqueous phase is dispersed in an oil phase.

Generally, an emulsion composition containing an emulsifier, oil, and water, and having a high proportion of a dispersed phase is called a high internal phase emulsion composition (see Patent Document 1). One of the merits of the high internal phase emulsion composition is that, as a W/O type emulsified cosmetic in which an aqueous phase is dispersed in an oil phase, both a refreshing feeling of use and a high moisturizing effect can be obtained. On the other hand, the demerit is that it is difficult to maintain the emulsified state and the stability over time is low.

JP-A-57-81827

According to the research conducted by the present inventors, when a polyglycerin fatty acid ester is used as an emulsifier in a high internal phase W/O type emulsion composition, it is excellent in freshness and moisturizing feeling. However, in addition to this, when an attempt was made to add a water-soluble active ingredient such as a fermented lactic acid bacterium extract, there was a problem that the stability of the emulsified state was worse than when no water-soluble active ingredient was added.

Therefore, an object of the present invention is to use a polyglycerin fatty acid ester as an emulsifier, and to make it possible to stably maintain the emulsified state even when a water-soluble active ingredient such as a lactic acid bacterium fermentation extract is added. It is intended to provide a high internal phase W/O type emulsion composition and a cosmetic using the same.

The present inventors have conducted intensive studies to achieve the above object, and completed the present invention.

That is, the first aspect of the present invention comprises (A) an emulsifier, (B) oil, (C) water, and (D) a water-soluble active ingredient, and the proportion of the water phase is 70% by mass or more. A W/O type emulsified composition, wherein the (A) emulsifier contains a polyglycerin fatty acid ester, and the composition further contains (E) a monoalcohol and/or a polyhydric alcohol. A phase W/O type emulsion composition is provided.

According to the high internal phase W/O type emulsion composition of the present invention, since polyglycerin fatty acid ester is used as an emulsifier, it is excellent in freshness and moisturizing feeling. Even if the water-soluble active ingredient is blended, the high internal phase W/O type emulsified state is stably maintained by containing the monoalcohol and/or polyhydric alcohol.

In the high internal phase W/O type emulsion composition according to the present invention, the (E) monoalcohol and/or polyhydric alcohol is a monoalcohol having 2 to 6 carbon atoms, a polyhydric alcohol having 2 to 6 carbon atoms, And one or more selected from the group consisting of polyoxypropylene diglyceryl ether.

In the high internal phase W/O type emulsion composition according to the present invention, the (E) monoalcohol and/or polyhydric alcohol is ethanol, 1,3-butylene glycol, dipropylene glycol, and polyoxypropylene diglyceryl. It is preferable to contain one or more selected from the group consisting of ethers.

In the high internal phase W/O type emulsion composition according to the present invention, it is preferable that the (E) monoalcohol and/or polyhydric alcohol is contained in an amount of 3.0% by mass or more and 40% by mass or less in the total amount of the composition. .

In the high internal phase W/O type emulsion composition according to the present invention, the polyglycerin fatty acid ester is preferably lipophilic.

In the high internal phase W/O type emulsion composition according to the present invention, it is preferable that the polyglycerin fatty acid ester has an unsaturated fatty acid and/or a branched fatty acid at a residue.

In the high internal phase W/O type emulsion composition according to the present invention, the composition preferably contains an oil gelling agent.

In the high internal phase W/O type emulsion composition according to the present invention, the (D) water-soluble active ingredient is a microbial fermentation product, hyaluronic acid and/or a salt thereof, a plant extract, glycyrrhizic acid and/or a salt thereof. , And one or more selected from the group consisting of ascorbic acid, a salt thereof and/or a derivative thereof. According to this, if the water-soluble active ingredient is a microbial fermentation product, the components such as amino acids contained therein are, if the water-soluble active ingredient is hyaluronic acid and/or its salt, the hyaluronic acid and/or its If the salt, if the water-soluble active ingredient is a plant extract, flavonoids contained therein, components such as polyphenols, if the water-soluble active ingredient is glycyrrhizic acid and/or its salt, its glycyrrhizic acid and/or its If the water-soluble active ingredient of the salt is ascorbic acid, its salt, and/or its derivative, the ascorbic acid, its salt, and/or its derivative contributes to the skin as substances that effectively exert their effects. You can

In the high internal phase W/O type emulsion composition according to the present invention, the content of the water-soluble active ingredient (D) is 0.01% by mass or more and 5.0% by dry solid content of the water-soluble active ingredient. It is preferably not more than mass %.

In the high internal phase W/O type emulsion composition according to the present invention, the composition is preferably in the form of a cosmetic. According to this, it is possible to provide an excellent W/O type emulsified cosmetic composition that does not hinder the stability of the emulsified state. Then, it is possible to provide a cosmetic composition which is intended to achieve both excellent feeling of use and the action and effect of the water-soluble active ingredient.

On the other hand, a second aspect of the present invention is to provide a cosmetic containing the above high internal phase W/O type emulsion composition.

Since the cosmetic according to the present invention contains the above-mentioned high internal phase W/O type emulsified composition, it provides an excellent W/O type emulsified cosmetic which does not hinder the stability of the emulsified state. can do. Then, it is possible to provide a cosmetic composition which is intended to achieve both excellent feeling of use and the action and effect of the water-soluble active ingredient.

According to the high internal phase W/O type emulsion composition of the present invention, since polyglycerin fatty acid ester is used as an emulsifier, it is excellent in freshness and moisturizing feeling. Further, by containing the monoalcohol and/or the polyhydric alcohol, the high internal phase W/O type emulsion state is stably maintained even when the water-soluble active ingredient is blended. Therefore, this makes it possible to provide an excellent W/O type emulsified cosmetic composition that does not hinder the stability of the emulsified state. Then, it is possible to provide a cosmetic composition which is intended to achieve both excellent feeling of use and the action and effect of the water-soluble active ingredient.

The high internal phase W/O type emulsion composition according to the present invention,
An emulsifier as component (A),
Oil as component (B),
Water as component (C),
As the component (D), a water-soluble active ingredient,
It contains a monoalcohol and/or a polyhydric alcohol as the component (E), and the proportion of the dispersed phase composed of an aqueous phase is 70% by mass or more.

Here, whether or not the emulsified state of the emulsified composition generally forms a W/O type emulsified state in which an aqueous phase is dispersed in an oil phase can be determined by a method well known to those skilled in the art, for example, a test tube. It is possible to determine that the emulsion is in a W/O type emulsified state if the emulsion is added dropwise to the water contained in the mixture and is not dispersed (dilution method). Further, for example, it is possible to confirm that the emulsion is in a W/O type by contacting the electrode portion of the tester with the emulsion and measuring the electrical conductivity (electrical conductivity method). Furthermore, for example, a water-soluble or oil-soluble dye can be added, and it can be confirmed by a microscopic image that it is in a W/O type emulsion state (dye method).

In the high internal phase W/O type emulsion composition according to the present invention, the proportion of the dispersed phase composed of an aqueous phase is preferably 70% by mass or more and 99% by mass or less, and 74% by mass or more and 95% by mass or less. It is more preferable that the content is 74% by mass or more and 90% by mass or less. When the proportion of the dispersed phase composed of the aqueous phase is less than the above range, for example, the characteristic properties of the high internal phase W/O type emulsion composition such as a refreshing feeling of use and a high moisturizing effect cannot be obtained. It is not preferable because there is.

At least a polyglycerin fatty acid ester is used as the emulsifier of the component (A). When a polyglycerin fatty acid ester is used as an emulsifier, it is excellent in the freshness and moisturizing feeling in addition to the characteristic properties of the high internal phase W/O type emulsion composition. In addition, the emulsifier here refers to a general substance having a function of emulsifying water and oil, for example, even when referred to as a surfactant, as long as it has such a function, It can be used as an emulsifier.

The polyglycerin fatty acid ester used in the present invention is not particularly limited as long as it can be generally used in cosmetics and the like. For example, the average degree of polymerization of glycerin in the glycerin-constituting part may be 1 to 10, more preferably 5 to 10. Further, for example, the carbon number of the fatty acid in the fatty acid ester constituent part may be 10 to 24, and more preferably 18 to 22. Furthermore, for example, the number of fatty acid molecules in the fatty acid ester constituent per glycerin unit (monoglycerin) in the glycerin constituent may be 0.3 or more, and more typically 0.5 or more.

Further, from the viewpoint of affinity between skin and cosmetics, it is preferable to use a lipophilic polyglycerin fatty acid ester, and in that case, the HLB value as an index of lipophilicity is 8 or less. It is preferably 4 or less, and more preferably 4 or less. The HLB (Hydrophile-Lipophile Balance) value is a numerical value calculated by the lipophilicity/hydrophilicity balance of the molecules constituting the emulsifier, and is an index well known to those skilled in the art as an index showing the properties of the emulsifier (for example, Miso Nonomura, "Cosmetics, Quasi-drugs, Surface Chemistry for Pharmaceuticals From Basics to Applications," Publisher: Fragrance Journal, Publication date: October 10, 2015, pp. 35-38). In addition, most of the emulsifiers on the market are distributed with the HLB value specific to the emulsifier. Therefore, based on such display of the distribution process, it can be determined whether the above HLB value is preferable.

Further, from the viewpoint of the stability of the high internal phase W/O type emulsion composition, the polyglycerin fatty acid ester preferably has an unsaturated fatty acid and/or a branched fatty acid at the residue. In this case, examples of the unsaturated fatty acid include polyricinoleic acid, oleic acid, hydroxystearic acid, palmitooleic acid, erucic acid, linolenic acid, eicosapentaenoic acid, docosahexaenoic acid, macadamia nut fatty acid and the like. Examples of branched fatty acids include isostearic acid and neopentanoic acid. The unsaturated fatty acid and/or branched fatty acid may have a single type or a plurality of types in one molecule of the polyglycerin fatty acid ester. That is, the polyglycerin fatty acid ester preferably has one or more residues selected from the group consisting of unsaturated fatty acids and branched fatty acids as the fatty acid in the fatty acid ester constituent part. The polyglycerin fatty acid ester has one or more kinds of residues selected from the group consisting of unsaturated fatty acids and branched fatty acids, and does not have only linear saturated fatty acids as residues. Is more preferred, and even more preferred is one having only one or more residues selected from the group consisting of unsaturated fatty acids and branched fatty acids.

To further specifically exemplify the polyglycerin fatty acid ester used in the present invention, for example, polyglyceryl-5 polyricinoleate, polyglyceryl-6 polyricinoleate, polyglyceryl-10 polyricinoleate, polyglyceryl-2 oleate, oleic acid. Examples thereof include polyglyceryl-3, polyglyceryl-4 oleate, polyglyceryl trioleate-10, polyglyceryl-10 pentaoleate, polyglyceryl-10 hydroxystearate, deca macadamia nut fatty acid polyglyceryl-10 and polyglyceryl pentaisostearate.

As the emulsifier of the component (A), the above-mentioned polyglycerin fatty acid ester may be used alone or in combination of two or more.

As the emulsifier of the component (A), other emulsifiers other than those belonging to the polyglycerin fatty acid ester described above may be appropriately used in combination. As the other emulsifier, an emulsifier generally usable for cosmetics and the like may be appropriately selected and used, and examples thereof include sucrose, (mono)glycerin, sorbitan, and fatty acid ester having oxyethylene as a hydrophilic part. Can be mentioned. From the viewpoint of the stability of the emulsified state of the high internal phase W/O type emulsion composition, an emulsifier in which the fatty acid in the fatty acid ester component is an unsaturated fatty acid is preferable. Examples of unsaturated fatty acids include oleic acid and erucic acid. Among them, sucrose oleate and sucrose erucate are preferably used. Further, from the viewpoint of feeling in use, stability and viscosity of the emulsion composition, an emulsifier such as palmitic acid or stearic acid in which the fatty acid in the fatty acid ester constituent is a saturated fatty acid may be used in combination. Of these, sucrose palmitate, sucrose stearate and the like are preferably used.

As the emulsifier of the component (A), one kind of emulsifier other than those belonging to the above-mentioned polyglycerin fatty acid ester may be used alone, or two or more kinds may be used in combination.

However, from the viewpoint of obtaining a feeling of use that gives a fresh and moist feeling due to the above-mentioned polyglycerin fatty acid ester, the content of an emulsifier other than those belonging to the above-mentioned polyglycerin fatty acid ester in the total amount of the emulsifier of component (A) Is preferably not included, or more than 0% by mass and 50% by mass or less, more preferably not included, or more preferably more than 0% by mass and 25% by mass or less, not included, or more than 0% by mass and 10% by mass. It is even more preferable that In some cases, it is most preferable that they are not included.

The content of the component (A) (when the emulsifiers other than those belonging to the polyglycerin fatty acid ester are included, as the total amount of those belonging to the polyglycerin fatty acid ester and those other than that), the component ( There is also a relationship with the blending amounts of B) to (E) and the blending amounts of other raw materials, and although it is not unconditional depending on the type of emulsifier used, typically, for example, 0.1 The content is preferably 30% by mass or more and 30% by mass or less, and more preferably 0.5% by mass or more and 5.0% by mass or less. Outside of this range, it may not be possible to prepare a stable high internal phase W/O type emulsion composition, which is not preferable. In addition, the content of the above-mentioned polyglycerin fatty acid ester is typically, for example, preferably 0.1% by mass or more and 30% by mass or less, and 0.5% by mass or more and 5.% by mass or less in the total amount of the composition. It is more preferably 0% by mass or less. If it is less than the above range, it may not be possible to prepare a stable high internal phase W/O type emulsion composition, which is not preferable. On the other hand, if the amount exceeds the above range, the effect of obtaining freshness and moisturizing feeling may not be obtained, which is not preferable.

As the oil of the component (B), an oil generally usable in cosmetics and the like may be appropriately selected and used, and is not particularly limited. For example, from the viewpoint of preparing a high internal phase W/O type emulsion composition Therefore, it is preferable to use an oil that becomes liquid at the preparation temperature (for example, 80° C.). Further, from the viewpoint of an emulsion liquid cosmetic which has a low viscosity and is easily applied to the skin, it is preferable to use an oil that becomes liquid at room temperature (25° C.).

Specifically, for example, it is an ester oil obtained by esterifying a fatty acid and an alcohol. As the ester oil, for example, cetyl 2-ethylhexanoate, isononyl isononanoate, isopropyl myristate, glyceryl tri-2-ethylhexanoate, 2-octyldodecyl myristate, 2-ethylhexyl palmitate, 2-octyldodecyl oleate, Examples include neopentyl glycol di-2-ethylhexanoate, glyceryl triisostearate, diisostearyl malate, diglyceryl 2-ethylhexanoate, tri(caprylic/capric acid)glyceryl, and the like. From the viewpoint of low viscosity and stability, cetyl 2-ethylhexanoate, isononyl isononanoate, glyceryl tri-2-ethylhexanoate, tri(caprylic acid/capric acid) glyceryl and the like are preferable.

Further, for example, it is a hydrocarbon non-ester oil. Examples of the non-ester oil include mineral oil (liquid paraffin), squalane, squalene, ceresin and the like. From the viewpoint of low viscosity and stability, mineral oil, squalane and the like are preferable.

Further, for example, it is a silicone-based silicone oil. Examples of the silicone oil include diphenylsiloxytrimethicone, dimethicone (dimethylpolysiloxane), phenyltrimethicone, cyclopentanesiloxane and the like. From the viewpoint of familiarity with makeup and compatibility with other oil phase components when two or more kinds of oils are used, diphenylsiloxytrimethicone, cyclopentanesiloxane and the like are preferable.

Also, for example, vegetable oil. Examples of the vegetable oil include jojoba oil, olive oil, macadamia nut oil, camellia oil, avocado oil, rosehip oil, kukui nut oil, hazelnut oil, and meadow foam oil. From the viewpoint of stability, macadamia nut oil, meadowfoam oil and the like are preferable.

As the oil of the component (B), one type of the above-mentioned oil may be used alone, or two or more types may be used in combination.

The oil of the component (B) belongs to an oil which becomes liquid at a temperature (for example, 80° C.) for preparing the high internal phase W/O type emulsion composition or an oil which becomes liquid at ordinary temperature (25° C.). Besides, other oils may be appropriately used in combination. As the other oil, an emulsifier generally usable in cosmetics and the like may be appropriately selected and used. For example, from the viewpoint of adjusting the feeling of use of the cosmetic, for example, cholesteryl hydroxystearate, dimer dilinol. Examples thereof include semi-solid oils such as acids (phytosteryl/isostearyl/cetyl/stearyl/behenyl) and di(octyldodecyl/phytosteryl/behenyl) lauroylglutamate, and solid oils such as batyl stearate, behenyl alcohol, beeswax and cholesterol.

As the above-mentioned other oil, as the oil of the component (B), one type thereof may be used alone, or two or more types may be used in combination.

However, from the viewpoint of using a liquid at the preparation temperature (for example, 80° C.) of the high internal phase W/O type emulsion composition, or from the viewpoint of providing an emulsion liquid cosmetic having low viscosity and easy to apply to the skin, In the total amount of the oil of the component (B), the content of the above-mentioned other oil is not included, or preferably more than 0 mass% and 50 mass% or less, not contained, or more than 0 mass% and 25 mass%. It is more preferably at most, and even more preferably not included or more than 0% by mass and 10% by mass or less. In some cases, it is most preferable that they are not included.

As the content of the component (B) (when including the above-mentioned other oils or when including two or more kinds of oils, as the total amount thereof), the components (A) and (C) to (E) There is also a relationship with the blending amount of other raw materials and the blending amount of other raw materials, and although it is not unconditional depending on the type of oil used, typically, for example, 0.1 mass% to 30 mass% in the total amount of the composition. It is preferably at most 5.0% by mass and more preferably at most 25% by mass. When it exceeds the above range, it may be difficult to maintain the occupancy ratio of the dispersed phase composed of the aqueous phase. If it is less than the above range, it may be difficult to maintain the W/O type emulsified state.

As the water of the component (C), for example, purified water, distilled water, ion-exchanged water, RO water, sterilized water, or the like, which is generally usable for cosmetics, may be appropriately used without any particular limitation.

The content of the component (C) is not uncertain depending on the blending amounts of the components (A), (B), (D), and (E) and the blending amount of other raw materials, but it is typical. In the composition, for example, 20% by mass or more and 96% by mass or less is preferable, 30% by mass or more and 95% by mass or less is more preferable, and 30% by mass or more and 90% by mass or less is particularly preferable. preferable. When it is less than the above range, it may be difficult to maintain the occupancy ratio of the dispersed phase composed of the aqueous phase. Further, if it exceeds the above range, it may be difficult to maintain the W/O type emulsified state.

As the water-soluble active ingredient of component (D), a water-soluble active ingredient generally usable in cosmetics and the like may be appropriately selected and used without any particular limitation. For example, water-soluble active ingredients as shown below are preferably exemplified. However, it is not limited to these, and may be any component that can contribute as a substance that gives some effectiveness to the skin. In the present specification, the term “water-soluble” for the component (D) means that the high internal phase W/O type emulsion composition is well dissolved or dispersed in the dispersed phase composed of the aqueous phase, and at least the dispersion composed of the aqueous phase. It is meant to be a component having the property of being able to be present in a substantial amount in the phase.

(Microbial fermentation product)
Cultures obtained by fermenting components generally contained in cosmetics with lactic acid bacteria (including bifidobacteria) and yeasts, culture supernatants, and extracts obtained by extracting the cultures and/or culture supernatants with water or hydrous alcohol Etc. For example, lactic acid bacteria/milk fermented liquid as described in JP-B-02-040643, lactic acid bacteria/milk fermented liquid as described in Japanese Patent No. 4512265, and Japanese Patent No. 3795011. Lactobacillus/Aloe vera fermentation liquor, soy milk/bifidobacteria fermentation liquor as described in Japanese Patent No. 3184114, and lactic acid bacterium culture of milk component-containing medium as described in JP 2017-212894 A And a culture obtained by fermenting a lactic acid bacterium culture of a milk component-containing medium as described in WO2016/117489 with Wicker-Hammomyces piduperi, and the like. The microbial fermentation product is used in cosmetics as a substance such as an amino acid contained in the microbial fermentation product as a substance that imparts an effect such as a moisturizing action to the skin.

(Hyaluronic acid and/or its salt)
Examples include fermented products of microorganisms and extracts extracted from chicken mackerel. Specifically, for example, a culture obtained by fermenting a glucose-containing medium as described in JP-B-4-6356 with Streptococcus and the like can be mentioned. Hyaluronic acid and/or its salt is used in cosmetics as a substance that gives the skin an effect of moisturizing effect and a good feeling of use.

(Plant extract)
Seaweeds such as kelp, seaweed, mozuku, etc., chimpi, mugwort, ages, ghetto, cherry, peony, Centella asiatica, Bodaiju, water clove incense as described in JP 2002-179581 A or JP 2014-2184677 A Extracts obtained by extracting plants such as with water or alcohol are mentioned. The plant extract is used in cosmetics as a substance containing flavonoids, polyphenols, and the like contained in the plant extract as a substance that gives the skin an effect such as a moisturizing action and an antioxidant action.

(Glycyrrhizic acid and/or its salt)
Examples include substances obtained by subjecting substances extracted from licorice to acid hydrolysis. Examples of glycyrrhizinic acid and/or its salt include glycyrrhizinic acid, dipotassium glycyrrhizinate, and ammonium glycyrrhizinate. Glycyrrhizic acid and/or its salt is used in cosmetics as a substance that imparts effectiveness such as anti-inflammatory action to the skin.

(Ascorbic acid, its salt and/or its derivative)
Examples include a substance obtained by crystallizing a substance obtained by synthesis using glucose or a substance obtained by fermentation as a raw material, and a derivative obtained by chemically modifying this substance by synthesis or fermentation. Examples of ascorbic acid, salts thereof and/or derivatives thereof include ascorbic acid, sodium ascorbate, magnesium ascorbyl phosphate, disodium ascorbate sulfate, lauryl 3-glyceryl ascorbic acid and the like. Ascorbic acid, a salt thereof and/or a derivative thereof is used in cosmetics as a substance that imparts to the skin an effect such as a whitening effect, a dermal collagen synthesis promoting effect, and an antioxidant effect.

As the water-soluble active ingredient, one type of component (D) may be used alone, or two or more types may be used in combination.

The content of the component (D) has a relationship with the blending amounts of the components (A) to (C) and (E) and the blending amounts of other raw materials, and also the type and blending of the water-soluble active ingredient to be used. Although it is not unconditional depending on the purpose, typically, for example, it is preferably 0.01% by mass or more and 5.0% by mass or less in terms of dry solid content in the total amount of the composition, and 0.02% by mass or more and 3% by mass or less. It is more preferably 0.0% by mass or less, and further preferably 0.02% by mass or more and 2.0% by mass or less. If it is less than the above range, it may be difficult to obtain the action and effect obtained by blending the water-soluble active ingredient. On the other hand, if it exceeds the above range, it may be difficult to stably maintain the emulsified state of the high internal phase W/O type emulsion composition.

As the monoalcohol and/or polyhydric alcohol of the component (E), those generally usable in cosmetics and the like may be appropriately selected and used, but in the emulsified state of the high internal phase W/O type emulsion composition. From the viewpoint of stabilization, it is preferable to use, for example, a monoalcohol having 2 to 6 carbon atoms, a polyhydric alcohol having 2 to 6 carbon atoms, polyoxypropylene diglyceryl ether, or the like. Examples of the monoalcohol having 2 to 6 carbon atoms include ethanol, propanol, isopropanol, butanol and the like. Among them, it is more preferable to use ethanol, isopropanol or the like. Examples of the polyhydric alcohol having 2 to 6 carbon atoms include 1,3-butylene glycol, dipropylene glycol, 1,2-pentanediol, propanediol and 1,2-hexanediol. Above all, it is more preferable to use 1,3-butylene glycol, dipropylene glycol, 1,2-pentanediol, or the like.

As the component (E), one type of monoalcohol and/or polyhydric alcohol may be used alone, or two or more types may be used in combination.

The content of the component (E) has a relationship with the blending amounts of the components (A) to (D) and the blending amounts of other raw materials, and is also generally dependent on the type of monoalcohol and/or polyhydric alcohol used. However, typically, for example, the total amount of the composition is preferably 3.0% by mass or more and 40% by mass or less, more preferably 3.0% by mass or more and 20% by mass or less, and 5 It is even more preferably from 0.0% by mass to 15% by mass. Outside of this range, it may not be possible to prepare a stable high internal phase W/O type emulsion composition.

The high internal phase W/O type emulsion composition according to the present invention may contain an oil gelling agent in order to further stabilize the emulsified state.

As the oil gelling agent, an oil gelling agent generally usable in cosmetics and the like may be appropriately selected and used without any particular limitation. For example, dextrin palmitate, dextrin myristate, dextrin (palmitic acid/ethylhexanoic acid), esters of fatty acids with polysaccharides such as inulin stearate, glyceryl (behenic acid/eicosandioic acid) glyceryl fatty acid esters such as glyceryl behenate, Examples include higher alcohols such as batyl alcohol and behenyl alcohol, and organically modified clay minerals. Among them, it is preferable to use dextrin fatty acid ester, glycerin fatty acid ester, or the like, and more specifically, it is preferable to use dextrin palmitate, dextrin myristate, (behenic acid/eicosandioic acid) glyceryl, glyceryl behenate, or the like. ..

As the oil gelling agent, one type may be used alone, or two or more types may be used in combination.

The content of the oil gelling agent has a relationship with the blending amounts of the components (A) to (E) and the blending amounts of other raw materials, and depending on the type of the oil gelling agent used, it is not unconditional, Typically, for example, when it is contained in an amount of about 0.05% by mass or more in the total amount of the composition, it can contribute to the formation of a stable high internal phase W/O type emulsion composition. It is preferably 0.1% by mass or more, more preferably 0.1% by mass or more and 10% by mass or less, and even more preferably 0.1% by mass or more and 5% by mass or less. When it is less than the above range, the effect of stabilizing the emulsified state of the high internal phase W/O type emulsion composition becomes poor. Even if the content exceeds the above range, the effect of stabilizing the emulsified state is poor depending on the content, and the formation of a stable high internal phase W/O type emulsion composition may be hindered.

In the high internal phase W/O type emulsion composition according to the present invention, in addition to the above-mentioned components, components generally added to cosmetics and the like, for example, organic acids, salts, etc., within a range that does not impair the effects of the present invention. Any of antiseptics, fragrances, dyes and the like can be added. Moreover, you may mix|blend the thickener for thickening.

Further, from the viewpoint of adjusting the feeling of use of the cosmetic, an aqueous thickener such as xanthan gum, hydroxyethyl cellulose, carboxymethyl cellulose, silicic acid (Al/Mg), carboxyvinyl polymer, and acrylic acid/alkyl methacrylate polymer is appropriately used. You may mix.

The high internal phase W/O type emulsion composition according to the present invention is usually a raw material mainly composed of the oil of the component (B) and well soluble or dispersible in the oil, according to a preparation method well known to those skilled in the art. An oily raw material obtained by mixing or dispersing the above and an aqueous raw material obtained by mixing or dispersing a raw material mainly composed of water of the component (C) and capable of being well dissolved or dispersed in water are required. In that case, it can be prepared by adding an aqueous raw material to an oily raw material little by little and dispersing it under an appropriate temperature condition, for example, at room temperature to 80°C. After forming the emulsified state, it may be cooled to room temperature or the like. Since the oil gelling agent described above generally has an affinity for oil in many cases, it is preferable to mix or disperse it in an oily raw material during such preparation. When a lipophilic polyglycerin fatty acid ester is used as the component (A), it is also preferably mixed or dispersed in the oily raw material. On the other hand, since the water-soluble active ingredient of component (D) and the monoalcohol and/or polyhydric alcohol of component (E) generally have an affinity for water in many cases, an aqueous raw material may be used during such preparation. It is preferable to mix or disperse.

The high internal phase W/O type emulsion composition according to the present invention may be used as it is as a cosmetic, or may be used as a raw material of a cosmetic by blending it in the manufacturing process of the cosmetic. Specifically, for example, it is preferably used as a cosmetic or a raw material thereof in the form of emulsion, cream, cleansing, massage, sunscreen, makeup base, cream foundation and the like. The cosmetics mentioned here include pharmaceuticals, quasi-drugs, and cosmetics defined by the law on ensuring the quality, effectiveness and safety of pharmaceuticals, medical devices and the like.

Hereinafter, the present invention will be specifically described with reference to examples, but these examples do not limit the scope of the present invention.

[Test Example 1]
With the formulations shown in Tables 1 and 2, an attempt was made to prepare a high internal phase W/O type emulsion composition in which the proportion of the dispersed phase composed of an aqueous phase was 85% by mass. Specifically, after weighing each raw material of the oil phase and the water phase, each is melted and mixed at 80 ℃, while adding the water phase little by little to the oil phase at 80 ℃, Disper mixer (trade name "Three One Motor"Blh600" (stirring blade φ40 mm, manufactured by Shinto Kagaku Co., Ltd.) was dispersed at a stirrer blade rotation speed of 700 rpm, and then cooled to 35°C.

Among the water-soluble active ingredients, "lactic acid fermentation liquid (milk)" is obtained by fermenting a milk-containing medium with Streptococcus thermophilus YIT2084 strain (FERM BP-10879), and centrifuging and ultrafiltering the fermented product. It is a fermentation liquor (solid content concentration: 2.0% by mass) consisting of the supernatant (molecular weight cut-off of 20,000 Da or less) thus obtained. Further, the "lactic acid bacterium fermentation liquid (aloe)" is a fermentation liquid (solid content concentration 2.87% by mass) obtained by fermenting an aloe vera extract with Lactobacillus plantarum (ATCC 14917 strain). In addition, "yeast fermented broth" is obtained by fermenting a medium obtained by adding glucose to the above "lactic acid bacterium fermented broth (milk)" with Wicker Hammomyces piduperi YIT8095 (NBRC1290), and centrifuging and ultrafiltering the fermented product. It is a fermentation liquid (solid content concentration 1.97% by mass) consisting of the supernatant (molecular weight cut-off of 20,000 Da or less) obtained by the above. The “Na hyaluronate solution” is an aqueous solution in which sodium hyaluronate is dissolved in water to a concentration of 0.6% by mass.

Whether the preparation obtained as described above maintains an emulsified state under the respective temperature conditions of 5° C., 25° C., 40° C. and 50° C. without being separated into an oil phase and an aqueous phase It was visually observed for 1 to 5 days, and its stability was evaluated according to the following evaluation criteria.
(Stability evaluation criteria)
○: Good (no apparent separation)
Δ: Somewhat defective (separation can be seen in part)
X: Poor (visual separation is noticeable)

As a result, as shown in the results of Preparation Example 1-1 to Preparation Example 1-5 with respect to the reference preparation example in which the water-soluble active ingredient was not blended, various water-soluble active ingredients were added to the high internal phase W/O type emulsion composition. When blended with, the stability was poor in all cases. On the other hand, when 1,3-butylene glycol, which is a polyhydric alcohol, was further added, the stability was remarkably improved as seen in the results of Preparation Example 1-6 to Preparation Example 1-19. In addition, the judgment of the improvement in stability here was tested because it is usually stored in various temperature zones and is expected to be stored for a long time when used as cosmetics and the like. The results obtained under the storage conditions were comprehensively judged. That is, it was judged that the stability was improved when the stability was improved under at least one storage condition.

[Test Example 2]
A high internal phase W/O type emulsion composition in which the proportion of the dispersed phase composed of the aqueous phase was 85% by mass was prepared in the same manner as in Test Example 1 with the formulation shown in Table 3, and the stability of the emulsified state was prepared. Was evaluated.

As a result, as shown in the results of Preparation Example 2-2 to Preparation Example 2-5, monoalcohol ethanol (Preparation Example 2-3) and polyhydric alcohol dipropylene glycol (Preparation Example 2-4). ) Or polyoxypropylene diglyceryl ether (Preparation Example 2-5) in the same manner as in 1,3-butylene glycol (Preparation Example 2-2) shown in Test Example 1 above, and Preparation Example 2 in which they are not blended. It was revealed that the instability due to the addition of the water-soluble active ingredient (lactic acid bacterium fermentation liquid (milk)) was improved as compared with the high internal phase W/O type emulsion composition of -1.

[Test Example 3]
With the formulations shown in Tables 4-1, 4-2, in the same manner as in Test Example 1, a high internal phase W/O type emulsion composition in which the proportion of the dispersed phase composed of an aqueous phase was 85% by mass was prepared, The stability of the emulsified state was evaluated.

As a result, as seen in the results of Preparation Example 3-2 to Preparation Example 3-8, in this formulation example, when 1,3-butylene glycol was contained at a content of 3 to 40 mass%, It was revealed that the stability can be improved when compared to the high internal phase W/O type emulsion composition of Preparation Example 3-1 which is not compounded.

[Test Example 4]
A high internal phase W/O type emulsion composition in which the proportion of the dispersed phase composed of the aqueous phase was 85 mass% was prepared in the same manner as in Test Example 1 with the formulation shown in Table 5, and the stability of the emulsified state was prepared. Was evaluated.

As a result, even when polyglyceryl-10 pentaoleate was used as the emulsifier instead of polyglyceryl-5 polyricinoleate used in Test Examples 1 to 3, 1,3-butylene glycol, which is a polyhydric alcohol, was added. By doing so, it was revealed that the instability due to the addition of the water-soluble active ingredient (lactic acid bacterium fermentation liquid (milk)) was improved.

Claims (11)

A W/O emulsion composition comprising (A) an emulsifier, (B) oil, (C) water, and (D) a water-soluble active ingredient, wherein the proportion of the water phase is 70% by mass or more. The (A) emulsifier contains polyglycerin fatty acid ester, and the composition further contains (E) monoalcohol and/or polyhydric alcohol. The (E) monoalcohol and/or polyhydric alcohol is one selected from the group consisting of monoalcohols having 2 to 6 carbon atoms, polyhydric alcohol having 2 to 6 carbon atoms, and polyoxypropylene diglyceryl ether, or The high internal phase W/O type emulsion composition according to claim 1, comprising two or more kinds. The (E) monoalcohol and/or polyhydric alcohol includes one or more selected from the group consisting of ethanol, 1,3-butylene glycol, dipropylene glycol, and polyoxypropylene diglyceryl ether. The high internal phase W/O type emulsion composition according to claim 1. The high internal phase W/O type emulsification according to any one of claims 1 to 3, wherein the (E) monoalcohol and/or polyhydric alcohol is contained in an amount of 3% by mass or more and 40% by mass or less in the total amount of the composition. Composition. The high internal phase W/O type emulsion composition according to any one of claims 1 to 4, wherein the polyglycerin fatty acid ester is lipophilic. The high internal phase W/O type emulsion composition according to any one of claims 1 to 5, wherein the polyglycerin fatty acid ester has an unsaturated fatty acid and/or a branched fatty acid as a residue. The high internal phase W/O type emulsion composition according to any one of claims 1 to 6, wherein the composition comprises an oil gelling agent. The (D) water-soluble active ingredient is selected from the group consisting of microbial fermentation products, hyaluronic acid and/or salts thereof, plant extracts, glycyrrhizic acid and/or salts thereof, and ascorbic acid, salts and/or derivatives thereof. The high internal phase W/O type emulsion composition according to any one of claims 1 to 7, wherein the high internal phase W/O type emulsion composition is one or two or more types thereof. Content of the said (D) water-soluble active ingredient is 0.01 mass% or more and 5.0 mass% or less in dry solid content of this water-soluble active ingredient, In any one of Claims 1-8. The high internal phase W/O type emulsion composition described. The high internal phase W/O type emulsion composition according to any one of claims 1 to 9, which is in the form of a cosmetic. Cosmetics containing the high internal phase W/O type emulsion composition according to any one of claims 1 to 9.