JP2023132564A - Oil-in-water type emulsion composition - Google Patents

Abstract

To provide an oil-in-water type emulsion composition which forms a stable Pickering emulsion.SOLUTION: There is provided an oil-in-water type emulsion composition which comprises a component A: silica, a component B: polyglyceryl-6 polyricinoleate, a component C: an oil component selected from the group consisting of a silicone oil, a hydrocarbon oil, an ester oil, an ether oil and a vegetable oil, a component D: ethanol and a component E: water. The oil-in-water type emulsion composition further preferably comprises a component F: polyglycerol fatty acid ester having an HLB value not exceeding 6.0 other than the component B. The oil-in-water type emulsion composition further may comprise a component G: thickening agent.SELECTED DRAWING: None

Description

The present invention relates to oil-in-water emulsion compositions.

So-called Pickering emulsions are known in which oil droplets are stabilized by powder and contain no or only a small amount of surfactant (for example, Patent Documents 1 and 2). These Pickering emulsions can be used, for example, in liquid cosmetics such as body lotions, refreshing cosmetics, and deodorants containing particles.

Special table 2018-534310 publication Special Publication No. 2010-527332

In the Pickering emulsion described above, hydrophobized particles are generally used. However, for example, hydrophobized silica obtained by hydrophobizing hydrophilic silica is expensive, so it is required to easily form a stable Pickering emulsion using cheaper hydrophilic silica. Further, even with hydrophobized silica, a stable Pickering emulsion may not be obtained depending on the degree of hydrophobization, and it is required to be able to form a more stable Pickering emulsion.

Therefore, an object of the present invention is to provide an oil-in-water emulsion composition that forms a stable Pickering emulsion.

As a result of extensive studies, the present inventors have discovered that a stable Pickering emulsion can be formed by using silica and polyglyceryl-6 polyricinoleate together. The present invention was completed based on these findings.

That is, the present invention contains the following component (A), the following component (B), the following component (C), the following component (D), and the following component (E), and component (D) and component (E). Provided is an oil-in-water emulsion composition which is a Pickering emulsion having an aqueous phase containing component (C) and an oil phase containing component (C).
Component (A): Silica Component (B): Polyglyceryl-6 polyricinoleate
Component (C): Oily component selected from the group consisting of silicone oil, hydrocarbon oil, ester oil, ether oil, and vegetable oil Component (D): Ethanol Component (E): Water

It is preferable that the oil-in-water emulsion composition further contains the following component (F).
Component (F): Polyglycerin fatty acid ester other than component B, whose HLB value does not exceed 6.0

The IOB value of the component (C) is preferably 0 to 0.45.

The oil-in-water emulsion composition may further contain the following component (G).
Component (G): Thickener

The oil-in-water emulsion composition of the present invention can form a stable Pickering emulsion.

The oil-in-water emulsion composition of the present invention contains at least silica; polyglyceryl-6 polyricinoleate; an oily component selected from the group consisting of silicone oil, hydrocarbon oil, ester oil, ether oil, and vegetable oil; ethanol; and water. include. In this specification, silica is selected from the group consisting of "component (A)", polyglyceryl-6 polyricinoleate "component (B)", silicone oil, hydrocarbon oil, ester oil, ether oil, and vegetable oil. In some cases, the oily component is referred to as "component (C)," ethanol is referred to as "component (D)," and water is referred to as "component (E)."

It is preferable that the oil-in-water emulsion composition of the present invention contains a polyglycerin fatty acid ester other than component (B), which has an HLB value not exceeding 6.0. The oil-in-water emulsion composition of the present invention may contain a thickener. In addition, in this specification, polyglycerol fatty acid esters other than component (B) whose HLB value does not exceed 6.0 are referred to as "component (F)" and thickeners are referred to as "component (G)", respectively. There is.

That is, the oil-in-water emulsion composition of the present invention contains at least component (A), component (B), component (C), component (D), and component (E). The oil-in-water emulsion composition of the present invention preferably contains component (F), and may also contain component (G). The oil-in-water emulsion composition of the present invention may contain components other than the above-mentioned components (A) to (G). In addition, each component contained in the oil-in-water emulsion composition of the present invention, such as component (A), component (B), component (C), component (F), component (G), and other components, is , each of which may be used alone or in combination of two or more.

The oil-in-water emulsion composition of the present invention has an aqueous phase containing at least component (D) and component (E), and an oil phase (oil droplets) containing at least component (C) dispersed in the aqueous phase. Pickering emulsion. The Pickering emulsion has a structure in which component (A) is present at the interface between the aqueous phase and the oil phase.

[Component (A)]
Component (A) is silica. Component (A) exhibits the effect of forming a Pickering emulsion by being present at the interface between the water phase and the oil phase (oil droplets) in the oil-in-water emulsion composition of the present invention. As component (A), known and commonly used silica (silicic anhydride) can be used. Component (A) may be anhydrous silicic acid (hydrophilic silica) that has not been subjected to hydrophobic treatment, or may be silicic anhydride (hydrophobic silica) that has been subjected to hydrophobic treatment. Component (A) may also be silica surface-treated with amino acids, esters, lecithin, or the like. In the present invention, component (A) is preferably hydrophilic silica because it is possible to form a stable Pickering emulsion even if hydrophilic silica is used with component (B) described below. Moreover, the component (A) may be so-called easily disintegrating silica particles. Only one type of component (A) may be used, or two or more types may be used.

The above-mentioned hydrophilic silica is silica that has not been subjected to hydrophobization treatment, and is usually common silica. Hydrophilic silica is, for example, silica (silicic anhydride) whose surface remains silanol groups and siloxane groups, and is silica that has not been subjected to hydrophobization treatment as described below.

The hydrophobic silica is hydrophilic silica subjected to a hydrophobic treatment. Examples of the treatment agent used in the hydrophobization treatment include methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, hexamethyldisilazane, methyltrialkoxysilane, dimethyldialkoxysilane, trimethylalkoxysilane, ethyltrichlorosilane, and propyltrichlorosilane. , hexyltrichlorosilane, long-chain alkyltrichlorosilane, ethyltrialkoxysilane, propyltrialkoxysilane, hexyltrialkoxysilane, long-chain alkyltrialkoxysilane, methacrylsilane, fluoroalkylsilane, perfluoroalkylsilane; organic silyl compounds; dimethyl Examples include silicone compounds such as polysiloxane (silicone oil), methylphenylpolysiloxane, methylhydrogenpolysiloxane, and amino-modified silicone. The hydrophobization treatment can be performed using a known method, such as a liquid phase method, a gas phase method, an autoclave method, and the like. Specifically, examples of the hydrophobic silica include dimethylsiloxylated silica, trimethylsiloxylated silica, octylsiloxylated silica, silicone oil-treated silica, methacrylsiloxylated silica, and methylhydrogenpolysiloxane-coated silica. Examples include.

Commercially available products of component (A) include, for example, silicic anhydride manufactured by Fuji Silysia Chemical Co., Ltd. under the trade name "Silysia 320", trade name "Silysia 310P", trade name "Silysia 250", and trade name "Silysia 250N". , product name "Thylysia 350", product name "Thylysia 370", product name "Thylysia 380", product name "Thylysia 420", product name "Thylysia 430", product name "Thylysia 440", product name "Thylysia 450", and Product name "Silysia 470"; manufactured by Nippon Aerosil, which is silicic anhydride, product name "AEROSIL 50", product name "AEROSIL 90G", product name "AEROSIL 130", product name "AEROSIL 150", product name "AEROSIL 200". ”, product name “AEROSIL 300”, product name “AEROSIL 380”, product name “AEROSIL 200V” and product name “AEROSIL OX50”; product name “Sunsphere H-31” manufactured by AGC SI Tech, which is silicic anhydride. , Product name "Sunsphere H-51", Product name "Sunsphere H-121", Product name "Sunsphere H-201", Product name "Sunsphere H-32", Product name "Sunsphere H-52" , product name "Sunsphere H-122", product name "Sunsphere H-33" and product name "Sunsphere H-53"; manufactured by Nippon Aerosil Co., Ltd., product name "AEROSIL R972", which is dimethylsiloxylated silicic anhydride. ”, product name “AEROSIL R974” and product name “AEROSIL R9200”; trimethylsiloxylated silicic anhydride manufactured by Nippon Aerosil Co., Ltd., product name “AEROSIL RX200”, product name “AEROSIL R8200”, product name “AEROSIL RX300” and the product name "AEROSIL R812S"; octylsiloxylated silicic anhydride manufactured by Nippon Aerosil Co., Ltd., product name "AEROSIL R805"; silicone oil-treated silicic acid anhydride manufactured by Nippon Aerosil Co., Ltd., product name "AEROSIL R202", product Product name "AEROSIL RY200", Product name "AEROSIL RY200S" and Product name "AEROSIL RY300"; Manufactured by Nippon Aerosil Co., Ltd., which is methacrylsiloxylated silicic anhydride, Product name "AEROSIL R711"; Manufactured by Miyoshi Kasei Co., Ltd., Product name "Silica". Beads SB-705'' manufactured by Suzuki Oil Co., Ltd., product name ``God Ball SF-16C'', product name ``God Ball AF-6C'', and product name ``God Ball AF-16C''; manufactured by JGC Catalysts & Chemicals Co., Ltd., product name "Silica Microbeat P-1500"; manufactured by Asahi Kasei Wacker Silicone Co., Ltd., product name "HDK H2000", etc.

The content of component (A) in the oil-in-water emulsion composition of the present invention is not particularly limited, but is 0.01 to 20.0% by mass based on 100% by mass of the oil-in-water emulsion composition of the present invention. The content is preferably from 0.05 to 15.0% by mass, and even more preferably from 0.1 to 10.0% by mass. When the content ratio is 0.01% by mass or more, a stable Pickering emulsion is even more likely to be formed. In addition, oil floating (oil components not included in emulsion particles float to form an oil phase on the surface layer of the composition) is even less likely to occur. When the content is 20.0% by mass or less, free component (A) that does not contribute to the emulsion particles is less likely to be produced, and the aqueous phase is even less likely to become cloudy. The content ratio of component (A) above is the total content ratio of all components (A) in the oil-in-water emulsion composition of the present invention.

[Component (B)]
Component (B) is polyglyceryl-6 polyricinoleate. Component (B) exhibits the effect of forming a hydrophobic field on the particle surface of component (A). Thereby, even if component (A) is hydrophilic silica, a stable Pickering emulsion can be formed. Only one type of component (B) may be used, or two or more types may be used.

The content of component (B) in the oil-in-water emulsion composition of the present invention is preferably 0.03 to 4.0% by mass based on 100% by mass of the oil-in-water emulsion composition of the present invention. , more preferably 0.05 to 2.0% by weight, and still more preferably 0.1 to 1.0% by weight. When the content is 0.03% by mass or more, a more stable Pickering emulsion is formed. When the content ratio is 4.0% by mass or less, the usability is further improved. The content ratio of component (B) above is the total content ratio of all components (B) in the oil-in-water emulsion composition of the present invention.

[Component (C)]
Component (C) is one or more oily components selected from the group consisting of silicone oil, hydrocarbon oil, ester oil, ether oil, and vegetable oil. By blending component (C) as an oily component to an oil-in-water emulsion composition, an oil-in-water emulsion composition having an aqueous phase containing components (D) and (E) and an oil phase containing component (C) can be obtained. A Pickering emulsion can be formed. Note that polyglycerin fatty acid ester is not included in component (C). Only one type of component (B) may be used, or two or more types may be used.

Examples of the silicone oil include dimethylsilicone oils such as dimethylpolysiloxane (dimethicone) and highly polymerized dimethylpolysiloxane; and methylphenylsilicone oils such as methylphenylpolysiloxane.

Examples of the hydrocarbon oil include isoparaffin, light isoparaffin, light liquid isoparaffin, squalane, synthetic squalane, vegetable squalane (sugar squalane, olive squalane, etc.), liquid isoparaffin, liquid paraffin, hydrogenated polyisobutene, isododecane, mineral oil, etc. can be mentioned.

Examples of the ester oil include isopropyl myristate, isopropyl palmitate, myristyl myristate, cetyl palmitate, 2-ethylhexyl palmitate, octyldodecyl myristate, isopropyl isostearate, cetyl 2-ethylhexanoate, tri-2-ethyl Examples include glyceryl hexanoate, glyceryl tri(caprylic/capric acid), isononyl isononanoate, diisopropyl adipate, pentaerythrityl tetraoctoate, diisostearyl malate, dipentaerythrityl hexahydroxystearate, and the like.

The ester oil may be a fatty acid triglyceride (natural fatty acid triglyceride or synthetic fatty acid triglyceride). The fatty acid triglyceride mentioned above is preferably a fatty acid triglyceride in which one or more constituent fatty acids have 6 to 22 carbon atoms. Examples of the fatty acid triglycerides include glyceryl tri-2-ethylhexanoate, glyceryl tricaprylate, glyceryl tricaprate, glyceryl triundecylate, glyceryl tristearate, glyceryl triisostearate, glyceryl tripalmitate, glyceryl triundecanoate, and glyceryl tri-2-ethylhexanoate. - Glyceryl heptyl undecanoate, glyceryl tribehenate, glyceryl trimyristate, glyceryl trilaurate, glyceryl trioleate, glyceryl trilinoleate, glyceryl tripalmitoleate, glyceryl triacetyl hydroxystearate, glyceryl triacetyl ricinoleate, trihydroxy stearin Acid glyceryl, tri(caprylic/capric) glyceryl, tri(caprylic/capric/myristic/stearic) glyceryl, tri(caprylic/capric/isostearic/adipic) glyceryl, tri(caprylic/caprylic/stearic) glyceryl capric acid/lauric acid) glyceryl, tri (caprylic acid/capric acid/linoleic acid) glyceryl, tri (caprylic acid/capric acid/stearic acid) glyceryl, tri tallow fatty acid glyceryl, tri (tallow fatty acid/mink oil fatty acid/cod liver oil) fatty acid) glyceryl, tri(mink oil fatty acid/palmitic acid) glyceryl, tri-coconut oil fatty acid glyceryl, trilanolin fatty acid glyceryl, tri(ricinoleic acid/caproic acid/caprylic acid/capric acid) glyceryl, tri fatty acid (C10-18) glyceryl, tri fatty acid) Fatty acid (C12-18) glyceryl, hydrogenated trifatty acid (C12-18) glyceryl, trifatty acid (C12-20) glyceryl, trifatty acid (C18-36) glyceryl, tribranched fatty acid (C10-40) glyceryl, tribranched fatty acid (C12-31) Glyceryl, (hydrogenated rosin/diisostearic acid) glyceryl, tri (palm oil fatty acid/palm kernel oil fatty acid/olive oil fatty acid/macadamia nut oil fatty acid/canola seed oil fatty acid) glyceryl, tri (castor fatty acid/olive fatty acid) Examples include glyceryl, tri(behenic acid/isostearic acid/eicosandioic acid) glyceryl, and tri(mink fatty acid/palmitic acid) glyceryl.

Examples of the ether oil include l-menthyl glyceryl ether, diethylene glycol monoethyl ether, and the like.

Examples of the above-mentioned vegetable oils include macadamia nut oil, eucalyptus oil, coconut oil, avocado oil, safflower oil, olive oil, palm oil, palm kernel oil, kukui nut oil, shea butter, cocoa butter, almond oil, and sunflower oil. , rosehip oil, camellia oil, kiwifruit seed oil, camellia oil, apricot kernel oil, sesame oil, soybean oil, jojoba oil, castor oil, hazelnut oil, meadowfoam oil, peppermint oil, argan oil, carot oil, lavender oil, damask oil Rose wax, rose centifolia wax, rose wax, grapeseed oil, linseed oil, walnut oil, yuzu seed oil, evening primrose oil, corn germ oil, grape oil, hydrogenated products of these (e.g. hydrogenated castor) oil, hydrogenated jojoba oil, hydrogenated palm oil, hydrogenated avocado oil, hydrogenated soybean oil, etc.).

The IOB value of component (C) is preferably 0 to 0.45, more preferably 0 to 0.35, even more preferably 0 to 0.15, from the viewpoint of stability of the Pickering emulsion. The above IOB value is a value for each oily component contained in the oil-in-water emulsion composition of the present invention, and when two or more types of component (C) are included, it is a value for each oily component. The IOB (Inorganicity Organicity Balance) value is the value obtained by dividing the inorganic value (Inorganicity) by the organic value (Organicity). The IOB value of each component (C) can be determined based on, for example, "Organic Conceptual Diagram - Basics and Applications" by Yoshio Koda, published by Sankyo Publishing, 1984 (p. 11 to 17).

The content of component (C) in the oil-in-water emulsion composition of the present invention is preferably 0.01 to 20.0% by mass based on 100 mass% of the oil-in-water emulsion composition of the present invention. , more preferably 0.05 to 15.0% by weight, and even more preferably 0.1 to 10.0% by weight. When the content is 0.01% by mass or more, a more stable Pickering emulsion is formed. When the content ratio is 20.0% by mass or less, aggregation of the emulsion is less likely to occur. The content ratio of component (C) above is the total content ratio of all components (C) in the oil-in-water emulsion composition of the present invention.

The mass ratio of component (C) to component (A) in the oil-in-water emulsion composition of the present invention [component (C)/component (A)] is 0.45 to 1.0, preferably 0. .5 to 0.95, more preferably 0.6 to 0.9. When the mass ratio is 0.45 or more, the fluidity of the oil phase is sufficiently high, and the particle shape of the Pickering emulsion can be formed. When the mass ratio is 1.0 or less, oil floating can be suppressed.

[Component (D)]
Component (D) is ethanol. Component (D) is a component that forms the aqueous phase (matrix) of the oil-in-water Pickering emulsion in the oil-in-water emulsion composition of the present invention, together with component (E). Component (D) has the effect of lowering the polarity of the aqueous phase and improving the stability of the Pickering emulsion. Further, by using component (D), the oil-in-water emulsion composition of the present invention can be imparted with quick drying properties and a refreshing feel when used.

The content of component (D) in the oil-in-water emulsion composition of the present invention is preferably 20.0 to 50.0% by mass based on 100% by mass of the oil-in-water emulsion composition of the present invention. , more preferably 25.0 to 40.0% by mass. The content ratio of component (D) above is the total content ratio of all components (D) in the oil-in-water emulsion composition of the present invention.

[Component (E)]
Component (E) is water, and although not particularly limited, purified water is preferred. Component (E) is a component that forms the aqueous phase (matrix) of the oil-in-water Pickering emulsion in the oil-in-water emulsion composition of the present invention.

The content of component (E) in the oil-in-water emulsion composition of the present invention is not particularly limited, but is 40.0 to 70.0% by mass based on 100 mass% of the oil-in-water emulsion composition of the present invention. It is preferably 45.0 to 60.0% by mass, more preferably 45.0 to 60.0% by mass. When the content ratio is within the above range, an oil-in-water Pickering emulsion can be formed more stably.

[Component (F)]
Component (F) is a polyglycerol fatty acid ester other than component (B). Furthermore, component (F) is a polyglycerol fatty acid ester having an HLB (Hydrophile-Lipophile Balance) value not exceeding 6.0. It is presumed that by using component (F), component (F) is oriented in the hydrophobic field formed by component (B) on the particle surface of component (A), but the stability of the Pickering emulsion is Improve even further. Note that in this specification, the HLB value means a value determined by the Griffin method.

Component (F) includes, for example, polyglyceryl-10 decaisostearate, polyglyceryl-2 tetraisostearate, polyglyceryl-10 decaethylhexanoate, polyglyceryl-2 oleate, polyglyceryl-2 diisostearate, polyglyceryl-2 isostearate, and decaolein. Examples include polyglyceryl-4 acid, polyglyceryl pentaoleate, and polyglyceryl-2 caprate. Among these, polyglyceryl-10 decaisostearate is preferred. Polyglyceryl-10 Decaisostearate has the INCI name Polyglyceryl-10 Decaisostearate.

The content of component (F) in the oil-in-water emulsion composition of the present invention is not particularly limited, but is 0.03 to 4.0% by mass based on 100 mass% of the oil-in-water emulsion composition of the present invention. The content is preferably from 0.05 to 2.0% by mass, and even more preferably from 0.1 to 1.0% by mass. The content ratio of component (F) is the total content ratio of all components (F) in the oil-in-water emulsion composition of the present invention.

The content of polyglyceryl-10 decaisostearate in the oil-in-water emulsion composition of the present invention is not particularly limited, but is 0.03 to 4.0% by mass based on 100% by mass of the oil-in-water emulsion composition of the present invention. It is preferably 0.05 to 2.0 mass %, and even more preferably 0.1 to 1.0 mass %.

[Component (G)]
Component (G) is a thickener. When the oil-in-water emulsion composition of the present invention contains component (G), the stability of the Pickering emulsion can be further improved. In addition, emulsion particles can be suspended in the system, resulting in excellent aesthetics. Examples of the thickener include water-soluble polymers. Examples of the water-soluble polymers include cellulose thickeners such as hydroxymethyl cellulose, hydroxypropyl methyl cellulose, and crystalline cellulose (e.g., cellulose nanofibers); gum thickeners such as xanthan gum; carboxyvinyl polymers, (acrylates/acrylic acid Acrylic thickeners such as alkyl (C10-30) crosspolymer (acrylic acid/methacrylate ester copolymer), polyacrylate crosspolymer-6, alkyl acrylate copolymer, (Na acrylate/Na acryloyldimethyltaurate) copolymer Examples include agents. Among them, polyacrylate crosspolymer-6, alkyl acrylate copolymer, (Na acrylate/Na acryloyldimethyltaurate) copolymer), crystalline cellulose ( In particular, cellulose nanofibers) are preferred, and polyacrylate crosspolymer-6 and crystalline cellulose (especially cellulose nanofibers) are more preferred. The above-mentioned thickeners may be used alone or in combination of two or more.

In addition, when using a carboxyvinyl polymer, an acrylic acid/methacrylic acid ester copolymer, or the like as a thickener, it is usually used after being neutralized with a basic substance. Examples of the basic substance include alkanolamines such as triethanolamine and monoethanolamine; inorganic bases such as ammonia, sodium hydroxide, and potassium hydroxide; and basic amino acids such as arginine. In addition, the amount of the basic substance added is sufficient to neutralize carboxyvinyl polymer, acrylic acid/methacrylic acid ester copolymer, etc., and it can be added as appropriate depending on the type and amount of these components used. good.

When the oil-in-water emulsion composition of the present invention contains component (G), the content ratio of component (G) in the oil-in-water emulsion composition of the present invention is not particularly limited, but the oil-in-water emulsion composition of the present invention The amount is preferably 0.001 to 4.0% by weight, more preferably 0.005 to 3.0% by weight based on 100% by weight of the emulsified composition. The content ratio of component (G) is the total content ratio of all components (G) in the oil-in-water emulsion composition of the present invention.

The oil-in-water emulsion composition of the present invention may contain crystalline cellulose as component (G). The crystalline cellulose is preferably so-called cellulose nanofibers. The content of crystalline cellulose in the oil-in-water emulsion composition of the present invention is preferably 0.005 to 2.0% by mass, and more preferably It is preferably 0.01 to 1.8% by weight, more preferably 0.015 to 1.6% by weight. When the content ratio is 0.005% by mass or more, a Pickering emulsion is more likely to be formed. When the content ratio is 2.0% by mass or less, aggregation of the emulsion is less likely to occur.

The oil-in-water emulsion composition of the present invention may contain polyacrylate crosspolymer-6 as component (G). The above polyacrylate crosspolymer-6 is written as POLYACRYLATE CROSSPOLYMER-6 by the INCI name. By blending polyacrylate crosspolymer-6, the Pickering emulsion particles can be suspended without settling, resulting in an excellent aesthetic appearance. Commercially available products of the polyacrylate crosspolymer-6 include, for example, the trade name "SEPIMAX ZEN" (manufactured by SEPIMAX Co., Ltd.). The content ratio of polyacrylate crosspolymer-6 in the oil-in-water emulsion composition of the present invention is not particularly limited, but is 0.05 to 3.0% by mass based on 100% by mass of the oil-in-water emulsion composition of the present invention. It is preferably 0.1% to 1.5% by mass, more preferably 0.1 to 1.5% by mass. When the content ratio is 0.05% by mass or more, Pickering emulsion particles are less likely to settle. When the content ratio is 3.0% by mass or less, the usability is further improved.

[Other ingredients]
The skin cosmetic of the present invention may contain components other than the above-mentioned components (A) to (G) (other components). The other components mentioned above are not particularly limited, and include, for example, components commonly used in cosmetics and quasi-drugs. Specifically, for example, lower alcohols other than component (D); polyhydric alcohols; humectants; pearlizing agents; anti-inflammatory agents such as glycyrrhizic acid and its salts; cooling agents such as menthol; phosphoric acid and its salts; pH adjusters such as citric acid and its salts, lactic acid and its salts, sodium hydroxide, triethanolamine; fragrance; ultraviolet absorber; antioxidant; preservative; metal ion sequestering agent; film-forming polymer compound; ingredients Powders other than (A); Coloring agents such as dyes and pigments; Vitamins; Amino acids; Astringents; Whitening agents; Animal and plant extracts; Neutralizing agents; Bactericidal agents; Antiperspirant ingredients; Deodorant ingredients; Acids; Examples include. The above-mentioned other components may be used alone or in combination of two or more.

When the oil-in-water emulsion composition of the present invention contains a colorant, the Pickering emulsion can be colored. By blending a colorant and a thickener in combination, a large colored Pickering emulsion can be suspended in the system, resulting in even better aesthetics. Further, two or more types of colorants may be used, and in this case, Pickering emulsions having various colors can be present in the composition, which is particularly excellent in aesthetics.

Examples of the polyhydric alcohol include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, isoprene glycol, 1,2-hexanediol, 1,2-octanediol, 1, Examples include 2-decanediol, concentrated glycerin, diglycerin, and polyglycerin.

The antiperspirant component is, for example, a drug that suppresses the generation of sweat by astringent the skin. Examples of the above-mentioned antiperspirant components include aluminum chlorohydroxy, aluminum chloride, potassium aluminum sulfate, aluminum sulfate, aluminum acetate, aluminum chlorhydroxy allantoin, and zinc paraphenolsulfonate.

The above-mentioned disinfectant is, for example, a drug that suppresses the growth of resident skin bacteria that produce substances that cause body odor. Examples of the above-mentioned disinfectants include isopropylmethylphenol, benzalkonium chloride, benzethonium chloride, chlorhexidine hydrochloride, phenol, trichlorocarbanilide, chlorhexidine gluconate, triclosan, triclocarban, piroctone olamine, zinc pyrithione, salicylic acid, and sorbic acid. , lysozyme chloride, etc.

Examples of the above-mentioned refreshing agents include menthol, menthyl lactate, camphor, eucalyptol, and icilin.

The dosage form of the oil-in-water emulsion composition of the present invention is not particularly limited, but includes lotion, mist, gel, spray (aerosol type, non-aerosol type), tube, sheet, roll-on, and the like. Since the oil-in-water emulsion composition of the present invention has a good appearance, it is preferably used as a lotion or gel formulation.

The use of the oil-in-water emulsion composition of the present invention is not particularly limited, and may be applied to the skin (e.g., face, neck, scalp, shoulders, body, arms, elbows, palms, backs of hands, thighs, calves, knees, ankles, feet). It can be used for both the insteps of the feet, the soles of the feet, etc.) and the hair. That is, the oil-in-water emulsion composition of the present invention may be used as either a hair cosmetic or a skin cosmetic. Examples of the oil-in-water emulsion composition of the present invention include body odor suppressants (deodorants), refreshing cosmetics, lotions, hair cosmetics, shaving cosmetics, and the like.

The oil-in-water emulsion composition of the present invention is not particularly limited, and can be produced by any known or commonly used method. For example, a method of mixing each component may be mentioned, such as a method of mixing the above-mentioned components and stirring using a known stirring device such as a disperse mixer or a paddle mixer.

The present invention will be explained in more detail below based on Examples, but the present invention is not limited only to these Examples. The content percentages listed in the table are the content percentages of each component (that is, the content percentages of active ingredients in each raw material, so-called pure content), and are expressed in "mass%" unless otherwise specified.

(Examples 1 to 22 and Comparative Examples 1 to 3)
Each composition of Examples and Comparative Examples was prepared by a conventional method using each component listed in the table. Note that as the silica of component (A), hydrophilic silica (manufactured by Fuji Silysia Chemical Co., Ltd., trade name "Silosphere C-1510") was used.

(evaluation)
Each composition obtained in Examples and Comparative Examples was evaluated as follows. The evaluation results are listed in the table.

(1) Pickering emulsion forming properties Each composition obtained in Examples and Comparative Examples was observed using an optical microscope. The structure was confirmed. In addition, the presence or absence of turbidity in the aqueous phase was visually observed. Pickering emulsion formability was determined based on the following criteria.
<Pickering emulsion forming property>
Excellent (◎): A structure (Pickering emulsion) in which the powder was adsorbed at the interface between the oil droplets and the water phase was confirmed, and the water phase was transparent.
Good (○): A structure (Pickering emulsion) in which the powder was adsorbed at the interface between the oil droplets and the water phase was confirmed, but the water phase was cloudy.
Poor (x): A structure (Pickering emulsion) in which the powder was adsorbed at the interface between the oil droplets and the water phase could not be confirmed.

Examples of formulations of the oil-in-water emulsion composition of the present invention are shown below.

Prescription example 1 (cooling cosmetics)
Ethanol 50.0% by mass
Menthol 0.2% by mass
Citric acid 0.15% by mass
Na citrate 0.45% by mass
Hydrophilic silica 1.0% by mass
Polyglyceryl-6 polyricinoleate 0.2% by mass
Grapeseed oil 1.0% by mass
Decaglyceryl decaisostearate 0.1% by mass
Purified water Total balance 100% by mass

Prescription example 2 (antiperspirant gel)
Ethanol 50.0% by mass
Menthol 0.3% by mass
Isopropylmethylphenol 0.1% by mass
Zinc paraphenolsulfonate 0.3% by mass
Hydrophilic silica 1.5% by mass
Polyglyceryl-6 polyricinoleate 0.2% by mass
Avocado oil 1.5% by mass
Polyglyceryl-2 tetraisostearate 0.1% by mass
Potassium hydroxide 0.1% by mass
Carbomer 0.2% by mass
Purified water Total balance 100% by mass

Prescription example 3 (aftershave lotion)
Ethanol 20.0% by mass
Menthol 0.1% by mass
1,3-butylene glycol 2.0% by mass
Citric acid 0.1% by mass
Na citrate 0.3% by mass
Hydrophilic silica 2.0% by mass
Polyglyceryl-6 polyricinoleate 0.3% by mass
Cetyl 2-ethylhexanoate 1.5% by mass
Polyglyceryl-4 polyricinoleate 0.1% by mass
Purified water Total balance 100% by mass

Prescription example 4 (lotion)
Ethanol 5.0% by mass
Menthol 0.05% by mass
1,3-butylene glycol 2.0% by mass
Glycerin 1.0% by mass
Xanthan gum 0.2% by mass
Tranexamic acid 0.5% by mass
Citric acid 0.1% by mass
Na citrate 0.3% by mass
Hydrophilic silica 1.0% by mass
Polyglyceryl-6 polyricinoleate 0.2% by mass
Squalane 1.0% by mass
Polyglyceryl-10 pentysostearate 0.1% by mass
Purified water Total balance 100% by mass

Claims (4)

Contains the following component A, the following component B, the following component C, the following component D, and the following component E,
An oil-in-water emulsion composition that is a Pickering emulsion having an aqueous phase containing components D and E and an oil phase containing component C.
Component A: Silica Component B: Polyglyceryl-6 polyricinoleate
Component C: Oily component selected from the group consisting of silicone oil, hydrocarbon oil, ester oil, ether oil, and vegetable oil Component D: Ethanol Component E: Water The oil-in-water emulsion composition according to claim 1, further comprising the following component F.
Component F: Polyglycerin fatty acid ester other than component B, whose HLB value does not exceed 6.0 The oil-in-water emulsion composition according to claim 1 or 2, wherein component C has an IOB value of 0 to 0.45. The oil-in-water emulsion composition according to any one of claims 1 to 3, further comprising the following component G.
Component G: Thickener