Oil-based emulsions in water

Abstract

The objective is to provide an oil-in-water emulsion composition that exhibits excellent gel-like properties and viscosity stability, and forms uniform emulsion particles. [Solution] An oil-in-water emulsion composition comprising the following components (a) to (d): (a) a thickening polysaccharide excluding agar, (b) agar, (c) a water-swellable clay mineral, and (d) a surfactant; the mass ratio of the content of component (a) to the total content of components (a) and (b) being 0.20 to 0.90, and the mass ratio of the total content of components (a) and (b) to the content of component (c) being 0.50 to 20.00.

Description

Technical Field

[0001] The present invention relates to an oil-in-water type emulsion composition.

Background Art

[0002] In the field of external skin preparations such as cosmetics, an oil-in-water type emulsion composition having a gel feel is used for the purpose of enhancing the feeling of use when applied to the skin. In order to impart a gel feel or improve the stability in an oil-in-water type emulsion composition, generally, carbomer is widely used. On the other hand, in recent years, due to the increasing trend towards natural products, there has been a growing demand for an oil-in-water type emulsion composition that does not contain carbomer or contains a small amount of carbomer. When trying to avoid the blending of carbomer, it is common to use natural-derived thickening polysaccharides such as xanthan gum, agar, and mannan. However, only xanthan gum forms a viscous and creamy gel, but it is not sufficient to impart a gel feel. On the other hand, when using agar or mannan, gels lacking flexibility are formed, and there are problems such as water separation during storage and poor dischargeability from the container, and the compatibility between stability and usability is not sufficient.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Therefore, an object of the present invention is to provide an oil-in-water type emulsion composition that is excellent in gel feel and viscosity stability and forms uniform emulsion particles.

Means for Solving the Problems

[0004] As a result of intensive studies by the present inventors, it has been found that the above problems can be solved by including a thickening polysaccharide excluding agar, agar, and a water-swelling clay mineral in a specific ratio in an oil-in-water type emulsion composition, and the present invention has been completed.

[0005] That is, the present invention is as follows. [1] An oil-in-water type emulsion composition, It contains the following ingredients (a) to (d); (a) Thickening polysaccharides other than agar, (b) agar; (c) Water-swellable clay minerals, (d) Surfactants; The mass ratio of the content of component (a) to the total content of components (a) and (b) is 0.20 to 0.90. An oil-in-water emulsion composition in which the mass ratio of the total content of components (a) and (b) to the content of component (c) is 0.50 to 20.00. [2] The oil-in-water emulsion composition according to [1], wherein component (a) is one or more selected from the group consisting of xanthan gum and gum arabic. [3] The oil-in-water emulsion composition according to [1] or [2], wherein component (c) is a smectite clay mineral. [4] The oil-in-water emulsion composition according to [3], wherein the smectite clay mineral is one or more selected from the group consisting of hectorite and bentonite. [5] The oil-in-water emulsion composition according to any one of [1] to [4], wherein component (d) is a nonionic surfactant. [6] The oil-in-water emulsion composition according to [5], wherein the nonionic surfactant is one or more selected from the group consisting of polyglycerol fatty acid esters, alkyl glycosides, and glycerol fatty acid esters. [7] An oil-in-water emulsion composition according to any one of [1] to [6], comprising one or more selected from the group consisting of hydrocarbon oils, vegetable oils, ester oils, and higher alcohols. [8] The oil-in-water emulsion composition according to [7], wherein the mass ratio of the content of higher alcohols to the total content of components (a), (b), and (c) is 0.50 or less. [9] An oil-in-water emulsion composition according to any one of [1] to [8], wherein the viscosity at 20°C is 3000 mPa·s to 30000 mPa·s.

[10] An oil-in-water emulsion composition according to any one of [1] to [9], which substantially does not contain an acrylic acid polymer.

[11] An oil-in-water emulsion composition according to any one of [1] to

[10] , which is a composition for external use on the skin.

[12] The oil-in-water emulsion composition according to

[11] , which is a leave-on type topical skin composition.

[13] The oil-in-water emulsion composition according to

[11] or

[12] , which is a cosmetic. [Effects of the Invention]

[0006] The present invention provides an oil-in-water emulsion composition that exhibits excellent gel-like properties and viscosity stability, and forms uniform emulsion particles. [Modes for carrying out the invention]

[0007] The oil-in-water emulsion composition of the present invention contains (a) a thickening polysaccharide excluding agar. By including a thickening polysaccharide excluding agar, an oil-in-water emulsion composition with excellent gel-like properties and viscosity stability can be obtained. Examples of thickening polysaccharides other than agar include pectin, soybean polysaccharides, xanthan gum, gellan gum, carrageenan, alginic acid, fucoidan, agaropectin, hyaluronic acid, chondroitin sulfate, karaya gum, porphyran, gellan gum, galactomannan (e.g., locust bean gum, guar gum, tara gum, etc.), tamarind seed gum, glucomannan, psyllium seed gum, macrophomopsis gum, pullulan, curdlan, tragacanth gum, ghati gum, acacia gum, arabinogalactan, ferceleran, and cellulose derivatives (e.g., sodium carboxymethylcellulose, calcium carboxymethylcellulose, carboxymethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxypropylethylcellulose, hydroxyethylcellulose, hydroxymethylcellulose, ethylcellulose, methylcellulose, water-soluble hemicellulose, etc.). Thickening polysaccharides other than agar can be used individually or in combination of two or more types.

[0008] The content of thickening polysaccharides other than agar is not particularly limited, but may be, for example, 0.01% by mass or more, 0.05% by mass or more, 0.10% by mass or more, 0.20% by mass or more, 0.30% by mass or more, or 0.40% by mass or more relative to the entire oil-in-water emulsion composition, or it may be 1.50% by mass or less, 1.20% by mass or less, 1.00% by mass or less, 0.80% by mass or less, 0.70% by mass or less, or 0.60% by mass or less, or any combination thereof. Specifically, for example, (a) the content of thickening polysaccharides other than agar may be 0.01% to 1.50% by mass, 0.05% to 1.20% by mass, 0.10% to 1.00% by mass, 0.20% to 0.80% by mass, 0.30% to 0.70% by mass, or 0.40% to 0.60% by mass, relative to the entire oil-in-water emulsion composition.

[0009] The oil-in-water emulsion composition of the present invention contains (b) agar. The agar forms a gel structure, and upon application, this gel structure breaks down, resulting in a gel-like thickness and a refreshing, easily spreadable feel on the skin (gel-like sensation). Agar usually refers to powdered agar. The agar used in the present invention is a powder made from a viscous substance obtained from red algae such as Gelidium and Magnolia. The present invention can use commercially available agar without particular limitations as long as it is of a quality suitable for use in cosmetics, and specific examples include Pharmacopoeia Agar Powder PS-6 (manufactured by Ina Food Industry Co., Ltd.). Furthermore, the average molecular weight of the agar can be the same as that typically used in cosmetics.

[0010] The agar content is not particularly limited, but may be, for example, 0.005% by mass or more, 0.01% by mass or more, 0.05% by mass or more, 0.10% by mass or more, 0.20% by mass or more, 0.30% by mass or more, 1.50% by mass or less, 1.20% by mass or less, 1.00% by mass or less, 0.80% by mass or less, 0.50% by mass or less, or 0.40% by mass or less, or any combination thereof. Specifically, for example, (b) the agar content may be 0.005% by mass to 1.50% by mass, 0.01% by mass to 1.20% by mass, 0.05% by mass to 1.00% by mass, 0.10% by mass to 0.80% by mass, 0.20% by mass to 0.50% by mass, or 0.30% by mass to 0.40% by mass, relative to the entire oil-in-water emulsion composition.

[0011] The mass ratio of the content of (a) thickening polysaccharides excluding agar to the total content of (a) thickening polysaccharides excluding agar and (b) agar is 0.20 to 0.90. Furthermore, the mass ratio of the content of (a) thickening polysaccharides excluding agar to the total content of (a) thickening polysaccharides excluding agar and (b) agar is 0.20 or more, and may be 0.30 or more, 0.40 or more, or 0.50 or more, and may be 0.90 or less, 0.80 or less, 0.70 or less, or 0.60 or less, and may be a combination thereof. Specifically, for example, it may be 0.20 to 0.90, 0.30 to 0.80, 0.40 to 0.90, 0.50 to 0.70, or 0.50 to 0.60. If the mass ratio is less than 0.20, the viscosity stability of the composition will decrease and the dispensability from the container will be impaired. This is presumed to be because the agar content is too high compared to the content of other thickening polysaccharides, so when the composition is stored at high temperatures, the gel structure formed by the agar collapses and dissolves, and then when it returns to room temperature, some of the gel that dissolved at high temperatures re-forms a gel structure and the viscosity increases. On the other hand, when the mass ratio exceeds 0.90, the gel-like feel decreases. This is presumed to be because the content of other thickening polysaccharides is too high compared to the agar, so the proportion of the network structure formed by the agar decreases and the gelling strength decreases.

[0012] The oil-in-water emulsion composition of the present invention contains (c) a water-swellable clay mineral. The inclusion of a water-swellable clay mineral improves viscosity stability. This is presumed to be because, while water-swellable clay minerals have a thickening effect, their physical properties change slowly with temperature changes, thus suppressing the viscosity increase caused by agar when the composition is returned to room temperature after being stored at high temperature. Furthermore, the inclusion of a water-swellable clay mineral allows for the formation of uniform emulsion particles. This is presumed to be because the water-swellable clay mineral can form a Pickering emulsion, thus assisting in emulsification. Examples of water-swellable clay minerals include silt, marine silt, tanakura clay, smectite clay minerals, kaolin clay minerals, antigolite clay minerals, pyrophyllite clay minerals, mica clay minerals, vermiculite clay minerals, chlorite clay minerals, and silicate minerals. Examples of smectite-type clay minerals include montmorillonite, beidelite, nontronite, saponite, hectorite, souconite, stevensite, and bentonite. Water-swellable clay minerals may be naturally occurring or synthesized. Water-swellable clay minerals can be used individually or in combination of two or more types.

[0013] The content of water-swellable clay minerals is not particularly limited, but may be, for example, 0.01% by mass or more, 0.05% by mass or more, 0.10% by mass or more, 0.20% by mass or more, 0.30% by mass or more, or 0.40% by mass or more relative to the entire oil-in-water emulsion composition, or it may be 2.00% by mass or less, 1.70% by mass or less, 1.50% by mass or less, 1.20% by mass or less, 1.00% by mass or less, or 0.80% by mass or less, and any non-inconsistent combination thereof is also acceptable. Specifically, for example, (c) the content of water-swellable clay minerals may be 0.01% to 2.00% by mass, 0.05% to 1.70% by mass, 0.10% to 1.50% by mass, 0.20% to 1.20% by mass, 0.30% to 1.00% by mass, or 0.40% to 0.80% by mass, relative to the entire oil-in-water emulsion composition.

[0014] The mass ratio of the total content of (a) thickening polysaccharides excluding agar and (b) agar to the content of (c) water-swellable clay minerals is 0.50 to 20.00. Furthermore, the mass ratio of the total content of (a) thickening polysaccharides excluding agar and (b) agar to the content of (c) water-swellable clay minerals is 0.50 or more, and may be 0.60 or more, 0.70 or more, 0.80 or more, 1.00 or more, 1.30 or more, or 1.60 or more, and 20.00 or less, and may be 15.00 or less, 10.00 or less, 5.00 or less, 3.00 or less, 2.00 or less, or 1.80 or less, and combinations thereof are also acceptable. Specifically, for example, it is 0.50 to 20.00, and may also be 0.60 to 15.00, 0.70 to 10.00, 0.80 to 5.00, 1.00 to 3.00, 1.00 to 2.00, 1.30 to 1.80, or 1.60 to 1.80. If the mass ratio is less than 0.50, the gel-like texture decreases. This is thought to be because if the content of water-swellable clay minerals is too high relative to the total content of thickening polysaccharides excluding agar and agar, the contribution of the thickening polysaccharides excluding agar and agar, which are responsible for improving the gel-like texture, becomes smaller. On the other hand, if the mass ratio exceeds 20.00, viscosity stability decreases, and the emulsion particle size becomes non-uniform. This is presumably because, if the content of water-swellable clay minerals is too low compared to the total content of thickening polysaccharides excluding agar and agar, the contribution of agar, which has a high temperature dependence on viscosity, becomes larger, and the contribution of water-swellable clay minerals, which play an aid in emulsification, becomes smaller.

[0015] The oil-in-water emulsion composition of the present invention contains (d) a surfactant. The surfactant is not particularly limited, but examples include anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants.

[0016] As for anionic surfactants, Fatty acid soaps such as potassium coconut oil fatty acid (e.g., potassium cocoyl glutamate), potassium myristate, and potassium laurate; Alkyl sulfates such as potassium lauryl sulfate, sodium lauryl sulfate, triethanolamine lauryl sulfate, and sodium myristyl sulfate; Sodium polyoxyethylene lauryl ether sulfate such as POE(2) sodium lauryl ether sulfate; Polyoxyethylene alkyl ether sulfates such as triethanolamine polyoxyethylene lauryl ether sulfate; Alkyl phosphates such as lauryl phosphate; Amino acid surfactants such as acyl methyl taurate and sodium lauroyl methyl alanine; Sulfonates such as sodium lauryl sulfoacetate; and the like.

[0017] Examples of cationic surfactants include Alkyl ammonium salts such as cetyl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride (stearyl trimonium chloride), behenyl trimethyl ammonium chloride, lauryl trimethyl ammonium chloride, and stearoxypropyl trimonium chloride; Alkyl benzyl ammonium salts; Stearyl amine acetate; Polyoxyethylene alkyl amines such as polyoxyethylene lauryl amine and polyoxyethylene stearyl amine; Stearamidopropyl dimethyl amine; Benzalkonium chloride; and the like.

[0018] Examples of nonionic surfactants include Polyoxyethylene sorbitan fatty acid esters such as POE(20) sorbitan monolaurate, POE(20) sorbitan monopalmitate, POE(6) sorbitan monostearate, POE(20) sorbitan monostearate, POE(20) sorbitan tristearate, POE(6) sorbitan monooleate, POE(20) sorbitan monooleate, POE(20) sorbitan trioleate, and POE(20) sorbitan monoisostearate; Polyethylene glycol fatty acid esters such as POE(10) monostearate, POE(25) monostearate, POE(40) monostearate, POE(55) monostearate, POE(10) monolaurate, POE(10) monooleate, and PEG-20 sorbitan cocoate; Polyoxyethylene alkyl ethers such as POE(4) lauryl ether, POE(9) lauryl ether, POE(21) ​​lauryl ether, POE(150) cetyl ether, POE(20) cetyl ether, POE(2) cetyl ether, POE(10) cetyl ether, POE(25) cetyl ether, POE(30) cetyl ether, POE(10) oleyl ether, POE(15) oleyl ether, POE(7) oleyl ether, POE(20) oleyl ether, POE(50) oleyl ether, POE(5) behenyl ether, POE(10) behenyl ether, POE(20) behenyl ether, POE(30) behenyl ether, and POE(20) stearyl ether; Polyoxyethylene polyoxypropylene alkyl ethers such as POE(20)POP(4) cetyl ether, POE(20)POP(8) cetyl ether, and POE(30)POP(6) decyltetradecyl ether; Polyoxyethylene sorbitan fatty acid esters such as POE(60) sorbitan tetrastearate, POE(6) sorbitan tetraoleate, POE(30) sorbitan tetraoleate, POE(60) sorbitan tetraoleate, and POE(6) sorbitan monolaurate; Polyoxyethylene glycerin fatty acid esters such as POE(15) glyceryl monostearate, POE(5) glyceryl monostearate, and POE(15) glyceryl monooleate; Polyoxyethylene castor oil / hydrogenated castor oil such as POE(40) castor oil, POE(20) hydrogenated castor oil, POE(40) hydrogenated castor oil, POE(50) hydrogenated castor oil, POE(60) castor oil, POE(60) hydrogenated castor oil, POE(80) hydrogenated castor oil, POE(100) hydrogenated castor oil, etc. Polyoxyethylene lanolin alcohols such as POE(10) lanolin alcohol, POE(20) lanolin alcohol, and POE(40) lanolin alcohol; Sorbitan fatty acid esters such as sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquistearate, sorbitan monooleate, sorbitan sesquioleate, and sorbitan trioleate; Glycerin fatty acid esters such as glyceryl monooleate, glyceryl monostearate, and glyceryl monomyristate; Diglyceryl fatty acid esters such as diglyceryl monostearate, diglyceryl monooleate, and diglyceryl monoisostearate; triglyceryl fatty acid esters such as triglyceryl monolaurate, triglyceryl monomyristate, triglyceryl monooleate, and triglyceryl monostearate; tetraglyceryl fatty acid esters such as tetraglyceryl monostearate and tetraglyceryl monooleate; pentagglyceryl trimyristate, pentagglyceryl trioleate, pentagglyceryl monolaurate, pentagglyceryl monomyristate, pentagglyceryl monooleate, penta Polyglycerin fatty acid esters such as pentagricerin fatty acid esters including glyceryl monostearate, hexaglyceryl monooleate, hexaglyceryl monostearate, hexaglyceryl tristearate, hexaglyceryl monolaurate, hexaglyceryl monomyristate, and decaglycerin fatty acid esters including decaglyceryl monostearate, decaglyceryl distearate, decaglyceryl pentastearate, decaglyceryl diisostearate, decaglyceryl dioleate, decaglyceryl tristearate, decaglyceryl trioleate, decaglyceryl monolaurate, decaglyceryl monomyristate, decaglyceryl monooleate, decaglyceryl distearate; Alkyl glucosides such as arachidyl glucoside and lauryl glucoside; Fatty acid alkylolamides such as coconut oil fatty acid diethanolamide; Examples include alkyldimethylamine oxide solutions such as lauryldimethylamine oxide solution.

[0019] As for amphoteric surfactants, Betaine-type betaines such as lauryldimethylaminoacetic acid betaine (lauryl betaine), stearyl betaine, lauric acid amidopropyl betaine, lauryl hydroxysulfobetaine, stearyldimethylaminoacetic acid betaine, dodecylaminomethyldimethylsulfopropyl betaine, octadecylaminomethyldimethylsulfopropyl betaine, and other alkyl betaines; cocamidopropyl betaine, cocamidopropyl fatty acid amidopropyl betaine, cocamidopropyl fatty acid amidopropyl dimethylaminoacetic acid betaine (cocamidopropyl betaine), cocamidopropyl hydroxysultaine, and other fatty acid amidopropyl betaines; Alkylimidazole types such as 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine; Amine oxide types such as lauryldimethylamine N-oxide, oleyldimethylamine N-oxide, and lauramine oxide; Examples include lecithin such as egg yolk lecithin, soy lecithin, hydroxylated lecithin, and hydrogenated lecithin. Surfactants can be used individually or in combination of two or more types.

[0020] The surfactant is preferably a nonionic surfactant, and more preferably one or more selected from the group consisting of polyglycerin fatty acid esters, alkyl glycosides, and glycerin fatty acid esters.

[0021] The surfactant content is not particularly limited, but may be 0.01% by mass or more, 0.05% by mass or more, 0.10% by mass or more, 0.20% by mass or more, 0.30% by mass or more, or 0.40% by mass or more relative to the entire oil-in-water emulsion composition, or it may be 1.50% by mass or less, 1.20% by mass or less, 1.00% by mass or less, 0.80% by mass or less, 0.70% by mass or less, or 0.60% by mass or less, or a combination thereof. Specifically, for example, (d) the surfactant content may be 0.01% by mass to 1.50% by mass, 0.05% by mass to 1.20% by mass, 0.10% by mass to 1.00% by mass, 0.20% by mass to 0.80% by mass, 0.30% by mass to 0.70% by mass, or 0.40% by mass to 0.60% by mass, relative to the entire oil-in-water emulsion composition.

[0022] The oil-in-water emulsion composition of the present invention contains water. The water content is not particularly limited, but for example, it may be 50.00% by mass or more, 55.00% by mass or more, 60.00% by mass or more, 65.00% by mass or more, or 70.00% by mass or more relative to the entire oil-in-water emulsion composition, or it may be 90.00% by mass or less, 85.00% by mass or less, 80.00% by mass or less, or 75.00% by mass or less, and combinations thereof are also possible. Specifically, for example, the water content is relative to the entire oil-in-water emulsion composition The amounts may be 50.00% to 90.00% by mass, 55.00% to 85.00% by mass, 60.00% to 80.00% by mass, 65.00% to 75.00% by mass, or 70.00% to 75.00% by mass.

[0023] The oil-in-water emulsion composition of the present invention contains an oily component. Here, "oily component" refers to so-called oils or oil-soluble components, and specifically refers to a component that separates from water after being suspended in water at 25-65°C and allowed to stand for 1 hour. Oils are usually used as the oily component, but essential oils and oily fragrances may also be included. Components that do not separate from water (usually excluding surfactants) are referred to as "aqueous components."

[0024] The oily components are not particularly limited, but examples include the following: Apricot kernel oil, camellia oil, argan oil, soybean oil, olive oil, castor oil, coconut oil, palm oil, palm kernel oil, sesame oil, jojoba oil, cottonseed oil, rapeseed oil, linseed oil, rosehip oil, sunflower oil, essential oils, avocado oil, almond oil, rice bran oil, safflower oil, corn oil, grapeseed oil, coconut oil, argania spisano kernel oil, wheat germ oil, rice germ oil, kukui nut oil, cranbe abyssinica seed oil, hemp seed oil, peanut oil, sasanqua oil, evening primrose oil, pistachio oil, macadamia nut oil, meadowfoam oil, cocoa butter, shea butter, and other vegetable oils; Animal fats such as emu oil, horse oil, beef tallow, pork tallow, mutton tallow, mink oil, egg yolk fat, carp tallow, tuna tallow, and menhideen tallow; Light isoparaffins, squalane, liquid paraffin, mineral oil, petrolatum, dodecane, tetradecane, ozokerite, microcrystalline wax, isoparaffins, ceresin, alpha-olefin oligomers, polybutene, hydrogenated polyisoparaffins, limonene, turpentine oil, and other hydrocarbon oils; Fatty acids (preferably with 6 to 40 carbon atoms, more preferably with 12 to 30 carbon atoms) such as lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, isostearic acid, behenic acid, oxystearic acid, palmitoleic acid, linoleic acid, linolenic acid, ricinoleic acid, and undecylenic acid; Higher alcohols such as arachidyl alcohol, caproyl alcohol, caprylyl alcohol, caprylic alcohol, lauryl alcohol, isostearyl alcohol, myristyl alcohol, cetanol, stearyl alcohol, arachidyl alcohol, behenyl alcohol, oleyl alcohol, hexyldecanol, octyldodecanol, decyltetradecanol, cholesterol, and phytosterols; Esters of linear fatty acids and lower alcohols such as isopropyl myristate, isopropyl palmitate, and ethyl oleate, Esters of linear fatty acids and linear higher alcohols such as hexyl laurate, myristyl myristate, decyl oleate, and stearyl stearate. Esters of linear fatty acids such as octyldodecyl myristate, isostearyl palmitate, and ethylhexyl stearate with branched-chain alcohols. Esters of branched fatty acids such as ethyl isostearate and isopropyl isostearate with lower alcohols. Esters of branched fatty acids such as cetyl ethylhexanoate and hexyl isostearate with linear higher alcohols, Esters of fatty acids and polyhydric alcohols such as dicaprylate PG, triethylhexanoin, and tri(caprylic / capric acid) glyceryl, Esters of branched fatty acids and branched alcohols such as 2-octyldodecyl neopentanoate, isostearyl isostearate, and isononyl isononanoate. Esters of hydroxycarboxylic acids such as lauryl lactate, tri-2-ethylhexyl citrate, trioctyldodecyl citrate, and diisostearyl malate with alcohols, Esthetics such as diisopropyl adipate and diethyl sebacate, which are dibasic acid esters. Lu oil; Wax esters such as jojoba oil, jojoba fat, carnauba wax, candelilla wax, rice bran wax, shellac, lanolin, beeswax, montan wax, whale wax, orange roughy oil, sugarcane wax, palm wax, insect white wax, and wool fat; Other oily components include ethers of polyhydric alcohols and monohydric alcohols such as chymyl alcohol, batyl alcohol, and ceracyl alcohol; batyl isostearate, batyl stearate; and silicone oils such as alkyl-modified polysiloxanes (dimethylpolysiloxane (dimethicone)), methylphenylpolysiloxane, and fluorine-modified polysiloxanes. Oily active ingredients such as UV absorbers (diethylamino hydroxybenzoyl hexyl benzoate, ethylhexyl methoxycinnamate, polysilicone-15), DEET, and fragrance. Oily components can be used alone or in combination of two or more types.

[0025] The oily component is preferably one or more selected from the group consisting of hydrocarbon oils, higher alcohols (hereinafter also referred to as "component (e)"), and ester oils.

[0026] The content of the oily component is not particularly limited, but may be, for example, 3.00% by mass or more, 5.00% by mass or more, or 7.00% by mass or more, or 30.00% by mass or less, 20.00% by mass or less, or 10.00% by mass or less, or any non-inconsistent combination thereof, relative to the entire oil-in-water emulsion composition. Specifically, for example, the content of the oily component may be 3.00% to 30.00% by mass, 5.00% to 20.00% by mass, or 7.00% to 10.00% by mass, relative to the entire oil-in-water emulsion composition.

[0027] The mass ratio of the content of (e) higher alcohols to the total content of (a) thickening polysaccharides excluding agar, (b) agar, and (c) water-swellable clay minerals is preferably 0.50 or less, more preferably 0.40 or less, even more preferably 0.30 or less, even more preferably 0.20 or less, and may be 0.05 or more, 0.08 or more, or 0.10 or more. Specifically, for example, it may be 0.05 to 0.50, 0.08 to 0.40, 0.10 to 0.30, or 0.10 to 0.20. When the ratio is 0.50 or less, an oil-in-water emulsion composition with superior gel-like properties can be obtained. This is presumably because, while higher alcohols increase the viscosity of the composition by forming a hydrated crystalline structure, giving it a moist feel, when the ratio is 0.50 or less, the effect of the moistness provided by higher alcohols is small compared to the freshness (geliness) obtained from thickening polysaccharides other than agar, agar, and water-swellable clay minerals.

[0028] The viscosity of the oil-in-water emulsion composition of the present invention at 20°C is not particularly limited, but may be, for example, 3000 mPa·s or more, 5000 mPa·s or more, or 7500 mPa·s or more, or 30000 mPa·s or less, 20000 mPa·s or less, 15000 mPa·s or less, or 10000 mPa·s or less, or any non-contradictory combination thereof. Specifically, for example, the viscosity of the oil-in-water emulsion composition of the present invention at 20°C may be 3000 mPa·s to 30000 mPa·s, 5000 mPa·s to 20000 mPa·s, 7500 mPa·s to 15000 mPa·s, or 7500 mPa·s to 10000 mPa·s. The viscosity can be adjusted by the content of thickening polysaccharides other than agar, agar, water-swellable clay minerals, etc. Note that "viscosity" here refers to a B-type viscometer (for example, DIGITAL VISMETORON VDA2 (Shibaura S). The oil-in-water emulsion composition of the present invention is measured using a Stem Co., Ltd. rotor (No. 3 or No. 4), at a rotation speed of 6 rpm and a measurement temperature of 20°C, and the measurement value is the value obtained 60 seconds after the start of measurement.

[0029] The oil-in-water emulsion composition of the present invention is preferable as a topical skin composition because it has an excellent feel when applied to the skin. Possible forms of the topical skin composition include leave-on type and leave-on type. Any type is acceptable. Examples of topical skin compositions include cosmetics (including quasi-drugs) and pharmaceuticals. Examples of cosmetics include skincare cosmetics and makeup cosmetics. The dosage form of the oil-in-water emulsion composition of the present invention is not particularly limited and includes lotions, gels, creams, emulsions, and the like.

[0030] The oil-in-water emulsion composition of the present invention can be manufactured by conventional preparation methods, depending on the dosage form.

[0031] The oil-in-water emulsion composition of the present invention may optionally contain various active ingredients, humectants, pH adjusters, preservatives, antibacterial agents, antioxidants / antioxidant aids, UV absorbers, powders, etc., as long as they do not impair the effects of the present invention.

[0032] Active ingredients include skin whitening ingredients, wrinkle-improving ingredients, anti-inflammatory ingredients, and plant and animal extracts. As for whitening ingredients, there are no particular limitations as long as they are commonly used in topical skin compositions such as cosmetics. Examples include 4-n-butylresorcinol, ascorbic acid glucoside, 3-O-ethyl ascorbic acid, tranexamic acid, arbutin, ellagic acid, kojic acid, linoleic acid, nicotinamide, 5,5'-dipropylbiphenyl-2,2'-diol, disodium 5'-adenylate, cetyl tranexamate, potassium 4-methoxysalicylate, hydroquinone, and pantothenic acid.

[0033] As for wrinkle-improving ingredients, there are no particular limitations as long as they are commonly used in topical skin compositions such as cosmetics. Examples include sodium trifluoride isopropyl oxopropylaminocarbonylpyrrolidinecarbonylmethylpropylaminocarbonylbenzoylaminoacetate, nicotinamide, vitamin A or its derivatives (retinol, retinal, retinoic acid, tretinoin, isotretinoin, retinoic acid tocopherol, retinyl palmitate, retinyl acetate, etc.), benzyl ursolate, ursolic acid phosphate, benzyl betulinate, and benzyl acid phosphate.

[0034] As for plant and animal-derived extracts, there are no particular limitations as long as they are commonly used in pharmaceuticals, cosmetics, foods, etc. For example, Akebia extract, Thujopsis dolabrata extract, Asparagus extract, Avocado extract, Hydrangea macrophylla extract, Almond extract, Arnica extract, Aloe extract, Aronia extract, Apricot extract, Ginkgo biloba extract, Indian kino extract, Fennel extract, Aralia cordata extract, Rosehip extract, Eleutherococcus senticosus extract, Enmeisou extract, Scutellaria baicalensis extract, Phellodendron amurense extract, Coptis japonica extract, Panax ginseng extract, St. John's wort extract, Lamium album extract, Orange extract, Kakyō extract, Kudzu extract, Chamomile extract, Carrot extract, Artemisia capillaris extract, Licorice extract, Kiwi extract, Cucumber extract, Guava extract, Sophora flavescens extract, Gardenia extract, Sasa veitchii extract, Sophora flavescens extract, Walnut extract, Grapefruit extract, Black rice extract, Chlorella extract, Mulberry extract, Kaiketsu extract, Alpinia speciosa extract, Gentian extract, Geranium thunbergii extract, Black tea extract, Burdock extract, Rice extract, Rice fermentation extract, Rice bran fermentation extract, Rice germ oil, Lingonberry extract, Salvia extract Soapwort extract, bamboo extract, hawthorn extract, sunflower extract, sansho extract, shiitake mushroom extract, rehmannia extract, lithospermum extract, perilla extract, linden extract, meadowsweet extract, peony extract, ginger extract, calamus root extract, birch extract, horsetail extract, stevia extract, stevia ferment, ivy extract, hawthorn extract, elderflower extract, yarrow extract, peppermint extract, sage extract, mallow extract, chuanthera extract, swertia japonica extract, mulberry bark extract, Rhubarb extract, soybean extract, jujube extract, thyme extract, dandelion extract, tea extract, clove extract, citrus peel extract, sweet tea extract, chili pepper extract, angelica extract, calendula extract, peach kernel extract, spruce extract, Houttuynia cordata extract, tomato extract, natto extract, carrot extract, garlic extract, wild rose extract, hibiscus extract, Ophiopogon extract, lotus extract, parsley extract, birch extract, witch hazel extract, Isodon extract, cypress extract, loquat extract, coltsfoot extract, butterbur extract, Poria extract,Preferred extracts include butcher's broom extract, grape extract, grape seed extract, loofah extract, safflower extract, peppermint extract, linden extract, peony extract, hop extract, pine extract, marjoram extract, horse chestnut extract, skunk cabbage extract, soapberry extract, lemon balm extract, seaweed extract, peach extract, cornflower extract, eucalyptus extract, saxifrage extract, yuzu extract, lily extract, coix seed extract, mugwort extract, lavender extract, green tea extract, apple extract, rooibos tea extract, reishi mushroom extract, lettuce extract, lemon extract, forsythia extract, astragalus extract, rose extract, rosemary extract, Roman chamomile extract, royal jelly extract, and Sanguisorba officinalis extract.

[0035] Examples of anti-inflammatory components include clarinon, glabridin, glycyrrhizic acid, glycyrrhetinic acid, and pantothenyl alcohol, with glycyrrhizic acid and its salts being preferred, alkyl glycyrrhetinate and its salts, and glycyrrhetinic acid and its salts.

[0036] Examples of humectants include polyethylene glycol, propylene glycol, glycerin, 1,3-butylene glycol, xylitol, sorbitol, maltitol, carotenoid acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile salts, dl-pyrrolidone carboxylate, short-chain soluble collagen, diglycerin (EO)PO adduct, Rosa rugosa extract, Achillea millefolium extract, and Melilotus extract. Examples of pH adjusting agents include buffering agents such as lactate-sodium lactate, citrate-sodium citrate, and succinate-sodium succinate. Examples of preservatives include methylparaben, ethylparaben, butylparaben, phenoxyethanol, and hydroxyacetophenone. As antibacterial agents, synthetic agents such as 1,3-butylene glycol and parahydroxybenzoic acid esters are preferred, as are natural antibacterial substances such as caprylyl glycol, glyceryl caprylate, ethylhexylglycerin, and caprylhydroxamic acid. Examples of antioxidants include tocopherols, dibutylhydroxytoluene, butylhydroxyanisole, and gallic acid esters. Examples of antioxidant auxiliary agents include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, kephalin, hexametaphosphorate, phytic acid, and ethylenediaminetetraacetic acid. Examples of UV absorbers include moisturizing ingredients such as sodium pyrrolidone carboxylate, lactic acid, and sodium lactate; para-aminobenzoic acid-based UV absorbers; anthranilic acid-based UV absorbers; salicylic acid-based UV absorbers; cinnamic acid-based UV absorbers; benzophenone-based UV absorbers; sugar-based UV absorbers; and 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole and 4-methoxy-4'-t-butyldibenzoylmethane. Examples of powders include powders such as mica, talc, kaolin, synthetic mica, calcium carbonate, magnesium carbonate, aluminum oxide, and barium sulfate, which may have surface treatments; inorganic pigments such as red iron oxide, yellow iron oxide, black iron oxide, cobalt oxide, ultramarine, Prussian blue, titanium dioxide, and zinc oxide, which may have surface treatments; pearlescent agents such as titanium mica, fish scale foil, and bismuth oxychloride, which may have surface treatments; organic dyes such as Red 202, Red 228, Red 226, Yellow 4, Blue 404, Yellow 5, Red 505, Red 230, Red 223, Orange 201, Red 213, Yellow 204, Yellow 203, Blue 1, Green 201, Violet 201, and Red 204, which may be lake-formed; polyethylene powder, polymethyl methacrylate, nylon powder, and organopolysiloxane elastomers.

[0037] The oil-in-water emulsion composition of the present invention may contain an acrylic acid polymer, but it is preferable that it is substantially free of an acrylic acid polymer. According to the present invention, even without substantially containing an acrylic acid polymer, excellent gel-like properties, viscosity stability, and uniform emulsion particles can be obtained. Here, "substantially free" means that the content of the acrylic acid polymer is 1% by mass or less of the total oil-in-water emulsion composition. The content of the acrylic acid polymer may be 0.5% by mass or less, 0.1% by mass or less, 0.01% by mass or less, or 0% by mass of the total oil-in-water emulsion composition.

[0038] Acrylic acid polymers are polymers, copolymers, or crosspolymers composed of (meth)acrylic acid monomers and / or alkyl (meth)acrylic acid monomers.

[0039] Examples of acrylic acid-based polymers include acrylic acid-alkyl methacrylate copolymers, hydroxyethyl acrylate-acryloyldimethyl taurate salt copolymers, polyacrylic acid, or salts thereof. More specifically, acrylic acid polymers include, for example, one or more non-neutralizing acrylic acid polymers selected from the group consisting of (acrylates / alkyl(C10-30) acrylate) crosspolymer, (acrylates / steareth-20 itaconic acid) copolymer, steareth-10 allyl ether / acrylates copolymer, carbomer, and polyacrylamide; (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, (ammonium acryloyldimethyltaurate / vinylpyrrolidone) copolymer, (ammonium acryloyldimethyltaurate / beheneth-25 methacrylate) crosspolymer, (ammonium acryloyldimethyltaurate / methacrylate) Examples include one or more neutralized acrylic acid-based polymers selected from the group consisting of (steareth-25 lylate) crosspolymer, (ammonium acryloyldimethyltaurate / carboxyethylammonium acrylate) crosspolymer, acrylamide / ammonium acrylate copolymer, polyacrylate crosspolymer-6, polyacrylate crosspolymer-11, polyacrylate-13, (acrylic acid / acryloyldimethyltaurate / dimethylacrylamide) crosspolymer, (butyl acrylate / isopropylacrylamide / PEG-18 dimethacrylate) crosspolymer, acrylic acid / acrylamide methylpropanesulfonic acid copolymer, and (sodium acrylate / acryloyldimethyltaurate / dimethylacrylamide) crosspolymer. [Examples]

[0040] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples unless it exceeds the essence of the invention.

[0041] <Examples 1-7, Comparative Examples 1-5> The compositions for the examples and comparative examples were prepared to match the formulations (mass%) shown in Table 1. Specifically, the aqueous phase components were homogenized in a homogenizer while being heated to 85°C. Then, the oil phase components, which had been preheated and dissolved at 85°C, were added while being stirred in the homogenizer. After emulsification in the homogenizer for 5 minutes, the mixture was cooled to 30°C.

[0042] (1) Measurement of viscosity The above procedure was performed using a Type B viscometer (DIGITAL VISMETORON VDA2 (manufactured by Shibaura Systems Co., Ltd.)). The viscosity of each composition in the example and comparative examples was measured. Rotor No. 3 or No. 4, rotation speed 6 The measurement was performed under the conditions of rpm and a measurement temperature of 20°C, and the measured value 60 seconds after the start of measurement was defined as viscosity.

[0043] (2) Evaluation of gel-like texture Ten expert panelists applied each of the above examples and comparative compositions to their forearms and evaluated the gel-like texture according to the following criteria. ○: More than 8 out of 10 panelists responded that the product felt like a gel when applied, then broke down, and had a refreshing, smooth texture on the skin. △: Between 5 and 8 out of 10 panelists responded that the product felt like a gel when applied, then broke down, and had a refreshing, smooth texture on the skin. ×: Fewer than 5 out of 10 panelists reported that the product felt thick like a gel when applied, then broke down, and had a refreshing, smooth texture on the skin.

[0044] (3) Evaluation of emulsification state Using a laser diffraction particle size distribution analyzer (LS 13 320 (manufactured by Beckman Coulter)), the mean and standard deviation of the emulsified particle size of each composition in the above examples and comparative examples were measured. Based on the fact that the variability of the particle size distribution increases as the mean particle size increases, the emulsification state was evaluated according to the following criteria. ○: The standard deviation of the emulsified particle size is less than or equal to the average particle size × 1 / 2. ×: The standard deviation of the emulsified particle size exceeds half the average particle size.

[0045] (4) Evaluation of viscosity stability after storage at high temperatures 50 g of each composition from the examples and comparative examples was placed in glass vials and left to stand at 40°C for one month. After that, the vials were left to stand at 20°C until the temperature of the contents reached 20°C, then the vials were gently tilted 90° and evaluated according to the following criteria. ○: If the vial is knocked over, the contents will flow out. ×: The contents do not flow even if the vial is knocked over.

[0046] The results are shown in Table 1. The compositions of each example had moderate viscosity, excellent gel-like properties, good emulsification, and excellent viscosity stability.

[0047] [Table 1]

[0048] In Table 1, "a / (a+b)" indicates the mass ratio of the content of component (a) to the total content of components (a) and (b), and "(a+b) / c" indicates the mass ratio of the content of component (c) to the total content of component (c). The formula "e / (a+b+c)" represents the mass ratio of the total content of components (a) and (b), and indicates the mass ratio of the content of component (e) to the total content of components (a), (b), and (c). [Industrial applicability]

[0049] The present invention provides an oil-in-water emulsion composition that exhibits excellent gel-like properties and viscosity stability, and forms uniform emulsion particles. Because the oil-in-water emulsion composition of the present invention can be suitably applied to topical skin preparations such as cosmetics, it is highly useful industrially.

Claims

1. An oil-in-water emulsion composition, It contains the following components (a) to (d): (a) Thickening polysaccharides other than agar, (b) agar; (c) Water-swellable clay minerals, (d) Surfactants; The mass ratio of the content of component (a) to the total content of components (a) and (b) is 0.20 to 0.

90. An oil-in-water emulsion composition in which the mass ratio of the total content of components (a) and (b) to the content of component (c) is 0.50 to 20.

00.

2. The oil-in-water emulsion composition according to claim 1, wherein component (a) is one or more selected from the group consisting of xanthan gum and gum arabic.

3. The oil-in-water emulsion composition according to claim 1 or 2, wherein component (c) is a smectite-type clay mineral.

4. The oil-in-water emulsion composition according to claim 3, wherein the smectite-type clay mineral is one or more selected from the group consisting of hectorite and bentonite.

5. The oil-in-water emulsion composition according to claim 1 or 2, wherein component (d) is a nonionic surfactant.

6. The oil-in-water emulsion composition according to claim 5, wherein the nonionic surfactant is one or more selected from the group consisting of polyglycerin fatty acid esters, alkyl glycosides, and glycerin fatty acid esters.

7. The oil-in-water emulsion composition according to claim 1 or 2, comprising one or more selected from the group consisting of hydrocarbon oils, vegetable oils, ester oils, and higher alcohols.

8. The oil-in-water emulsion composition according to claim 7, wherein the mass ratio of the content of higher alcohols to the total content of components (a), (b), and (c) is 0.50 or less.

9. The oil-in-water emulsion composition according to claim 1 or 2, wherein the viscosity at 20°C is 3,000 mPa·s to 30,000 mPa·s.

10. An oil-in-water emulsion composition according to claim 1 or 2, which substantially does not contain an acrylic acid polymer.

11. An oil-in-water emulsion composition according to claim 1 or 2, which is a composition for external use on the skin.

12. The oil-in-water emulsion composition according to claim 11, which is a leave-on type topical skin composition.

13. The oil-in-water emulsion composition according to claim 11, which is a cosmetic.

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