JP7657038B2 - Oil-in-water compositions - Google Patents

Description

The present disclosure relates to oil-in-water compositions.

Oil-in-water compositions are used, for example, in skin topical preparations such as sunscreen cosmetics (see, for example, Patent Document 1). Patent Document 1 describes an oil-in-water skin cosmetic that contains an ultraviolet absorber and an ester oil having a sterol skeleton.

International Publication No. 2019/065368

The following analysis is given in light of this disclosure.

Some sunscreen cosmetics contain powder as an ultraviolet scattering agent. In such sunscreen cosmetics, a large amount of ultraviolet scattering agent may be added to enhance the ultraviolet protection effect. However, when an oil-in-water composition with a high powder content is applied to the skin, the user feels a squeaking sensation caused by the powder when applying the composition. Therefore, in order to alleviate this squeaking sensation, another powder such as silica (squeak-reducing powder) may be further added. However, when an oil-in-water composition with such squeaking-reducing powder is applied to the skin, the user can feel a smooth feel when using the composition, but cannot feel a moist feel when using the composition.

Therefore, there is a demand for oil-in-water compositions that do not cause any squeaking sensation when applied to the skin and that leave a moist feeling after application.

According to a first aspect of the present disclosure, there is provided an oil-in-water composition comprising (A) a first oil component consisting of a semi-solid oil having a melting point of 40°C to 50°C, (B) a first powder having a hydrophobic particle surface, (C) a second oil component containing a liquid oil component, and (D) an aqueous solvent. Component (A) is at least one of palm-derived oil and myristyl myristate. Component (B) is a hydrophobized metal oxide having an average primary particle size of 5 nm to 50 nm. Component (B) is 6% by mass to 20% by mass with respect to the mass of the composition. Component (A) is 0.04 parts by mass to 0.4 parts by mass with respect to 1 part by mass of component (B).

In the oil-in-water composition of the present disclosure, the squeaking sound caused by the hydrophobized powder when applied to the skin is suppressed. This allows the user to apply the oil-in-water composition with a comfortable feeling. In addition, when the oil-in-water composition of the present disclosure is applied to the skin, the user can feel a moist feeling on the skin.

The preferred forms for each of the above aspects are described below.

According to a preferred embodiment of the first aspect, component (B) is 2% by mass to 20% by mass relative to the mass of the composition. Component (C) is 5% by mass to 25% by mass relative to the mass of the composition.

According to a preferred embodiment of the first aspect, component (A) is at least one selected from the group consisting of palm-derived oil and fatty acid ester oil.

According to a preferred embodiment of the first aspect, the palm-derived oil is a mixture of at least one of palm oil and palm kernel oil and hydrogenated palm oil.

According to a preferred embodiment of the first aspect, the fatty acid ester oil is at least one selected from the group consisting of macadamiate phytosteryl and myristyl myristate.

According to a preferred embodiment of the first aspect, component (B) is a hydrophobized metal oxide having an average primary particle size of 5 nm to 50 nm.

According to a preferred embodiment of the first aspect, component (C) contains an oil-soluble UV absorber.

According to a preferred embodiment of the first aspect, the oil-in-water composition is applied to a skin topical preparation.

In the following explanation, POE is an abbreviation for polyoxyethylene, and POP is an abbreviation for polyoxypropylene, and the number in parentheses after POE or POP indicates the average number of moles of POE or POP groups added in the compound.

In this disclosure, "actual amount" refers to the amount of the compound that can produce an effective effect by adding it.

[First embodiment]
The oil-in-water composition according to the first embodiment of the present disclosure will be described. The oil-in-water composition according to the first embodiment includes (A) a first oil component, (B) a first powder, (C) a second oil component, and (D) an aqueous solvent. In the oil-in-water composition, at least a portion of component (B) is considered to be encapsulated in oil droplets of component (C).

[(A) First Oily Component]
The first oil component is composed of semi-solid oil. The semi-solid oil is considered to be present in the oil phase. The semi-solid oil is not completely solidified or liquefied at atmospheric pressure and 25°C, and is distinguished from liquid oil and solid oil. In the present disclosure, "solid" refers to an oil that can maintain a solid state at atmospheric pressure and 25°C. In the present disclosure, "liquid" refers to an oil that has fluidity (liquid state) at atmospheric pressure and 25°C. Component (A) has a melting point of 40°C to 50°C, preferably 44°C to 50°C. The melting point can be measured, for example, based on JIS K0064-1992. Preferably, the semi-solid oil has a hardness of 5 to 100 at 25°C under a card meter load of 800g, 5.6φ, and 25°C.

The semi-solid oil is at least one selected from the group consisting of palm-derived oil and fatty acid ester oil. In this disclosure, the palm-derived oil is a mixture of at least one selected from the group consisting of palm oil and palm kernel oil, and hydrogenated palm oil, and has a melting point of 44°C to 50°C. In this disclosure, the fatty acid ester oil is at least one selected from the group consisting of macadamiate phytosteryl and myristyl myristate, and has a melting point of 40°C to 50°C.

Component (A) is preferably 0.8% by mass or more, more preferably 1% by mass or more, based on the mass of the oil-in-water composition. Component (A) can be 1.5% by mass or more, or 2% by mass or more, based on the mass of the oil-in-water composition. If component (A) is less than 0.8% by mass, the spreadability during application becomes poor. Component (A) is preferably 3.5% by mass or less, more preferably 3% by mass or less, based on the mass of the oil-in-water composition. Component (A) can be 2.5% by mass or less, or 2% by mass or less, based on the mass of the oil-in-water composition. If component (A) exceeds 3.5% by mass, the composition becomes sticky when applied to the skin.

It is preferable that the amount of component (A) is 0.04 parts by mass or more per part by mass of component (B) described below. For example, the amount of component (A) can be 0.05 parts by mass or more, 0.08 parts by mass or more, 0.1 parts by mass or more, 0.15 parts by mass or more, 0.2 parts by mass or more, 0.25 parts by mass or more, or 0.3 parts by mass or more per part by mass of (B). If the amount of component (A) is less than 0.04 parts by mass, squeaks caused by component (B) will occur during application. It is preferable that the amount of component (A) is 0.4 parts by mass or less per part by mass of component (B). For example, the amount of component (A) can be 0.38 parts by mass or less, 0.35 parts by mass or less, 0.3 parts by mass or less, 0.25 parts by mass or less, 0.2 parts by mass or less, or 0.15 parts by mass or less per part by mass of (B). If the amount of component (A) exceeds 0.4 parts by mass, the moist feeling after application will be lost.

In this disclosure, "squeakiness" refers to the sensation felt when the composition is applied to the skin and becomes less smooth. The user begins to feel the squeakiness after application to the skin, and the squeakiness can become stronger over time. Squeakiness caused by powder is called powder squeakiness.

[(B) First Powder]
The first powder is a powder with a hydrophobic particle surface. The first powder may also include a powder whose particle surface has been hydrophobized. The first powder is considered to be encapsulated in the oil droplet particles (internal phase) in the oil-in-water composition. Examples of the hydrophobization method include coating the powder with a silicone resin, a fatty acid, or the like. The first powder may be, for example, a hydrophobized metal oxide powder. The metal oxide may be, for example, a powder that acts as an ultraviolet light scattering agent. Examples of the metal oxide include zinc oxide, titanium oxide, iron oxide, and cerium oxide.

The first powder preferably has an average primary particle size of 5 nm or more. The first powder preferably has an average primary particle size of 50 nm or less.

The first powder may have a linseed oil absorption of 170 ml or less per 100 g of the first powder at 25° C. The linseed oil absorption may be measured in accordance with JIS K5101-13-2 (boiled linseed oil method).

Component (B) is preferably 2% by mass or more, more preferably 4% by mass or more, based on the mass of the oil-in-water composition. Component (B) can be 6% by mass or more, 8% by mass or more, 10% by mass or more, or 12% by mass or more, based on the mass of the oil-in-water composition. When component (B) is an ultraviolet scattering agent, if component (B) is less than 2% by mass, sufficient ultraviolet protection effect cannot be obtained. Component (B) is preferably 20% by mass or less, based on the mass of the oil-in-water composition. Component (B) can be 18% by mass or less, 16% by mass or less, 14% by mass or less, 12% by mass or less, or 10% by mass or less, based on the mass of the oil-in-water composition. If component (B) exceeds 20% by mass, there is a risk of powdery squeaking when applied to the skin.

[(C) Second Oil Component]
The second oil component includes a liquid oil component. In the present disclosure, the second oil component does not include component (A). When the second oil component includes an oil-soluble UV absorber, the liquid oil component is preferably an oil component compatible with the oil-soluble UV absorber. Component (C) preferably includes at least one selected from the group consisting of liquid hydrocarbon oil, liquid ester oil, liquid higher alcohol, and liquid silicone oil.

Examples of hydrocarbon oils include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, isododecane, isohexadecane, hydrogenated polydecene, and mineral oil.

Synthetic ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate. glyceryl tri-2-ethylhexanoate, glyceryl trioctanoate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptylundecanoate glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptyl palmitate These include lauroyl undecyl, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate.

Examples of higher alcohols that can be used include straight-chain alcohols (e.g., lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, etc.); branched-chain alcohols (e.g., monostearyl glycerin ether (batyl alcohol), 2-decyltetradecinol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.); and the like.

Examples of silicone oils include silicone compounds such as dimethylpolysiloxane, methylhydrogenpolysiloxane, methylphenylpolysiloxane, stearoxymethylpolysiloxane, polyether-modified organopolysiloxane, fluoroalkyl-polyoxyalkylene-co-modified organopolysiloxane, alkyl-modified organopolysiloxane, terminal-modified organopolysiloxane, fluorine-modified organopolysiloxane, amino-modified organopolysiloxane, silicone gel, acrylic silicone, trimethylsiloxysilicate, silicone RTV rubber, and cyclopentasiloxane.

Component (C) may contain an oil-soluble UV absorber.

Examples of oil-soluble UV absorbers include benzoic acid-based UV absorbers (e.g., para-aminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerin ester, N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA ethyl ester, N,N-dimethyl PABA butyl ester, N,N-dimethyl PABA ethyl ester, diethylaminohydroxybenzoylhexyl benzoate, etc.); anthranilic acid-based UV absorbers absorbents (e.g., homomenthyl-N-acetylanthranilate, etc.); salicylic acid-based ultraviolet absorbents (e.g., ethylhexyl salicylate, amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, homosalate, etc.); cinnamic acid-based ultraviolet absorbents (e.g., octyl methoxycinnamate, ethyl-4-isopropyl cinnamate, methyl-2,5 -Diisopropyl cinnamate, ethyl 2,4-diisopropyl cinnamate, methyl 2,4-diisopropyl cinnamate, propyl p-methoxycinnamate, isopropyl p-methoxycinnamate, isoamyl p-methoxycinnamate, octyl p-methoxycinnamate (2-ethylhexyl p-methoxycinnamate, ethylhexyl methoxycinnamate), 2-ethoxyethyl p-methoxycinnamate, cyclohexyl p-methoxycinnamate methyl-α-cyano-β-phenylcinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl-di-paramethoxycinnamate, etc.); 3-(4'-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor; 2-phenyl-5-methylbenzoxazole; 2,2'-hydroxy-5-methylphenylbenzotriazole; 2-(2'-hydroxy-5'-t-octylphenyl) Benzotriazole; 2-(2'-hydroxy-5'-methylphenylbenzotriazole; dibenzalazine; dianisoylmethane; 4-methoxy-4'-t-butyldibenzoylmethane; 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, dimorpholinopyridazinone; 2-ethylhexyl-2-cyano-3,3-diphenylacrylate (octocrellin); 2,4-bis-{[4-(2-ethylhexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-(1,3,5)-triazine, benzophenone-based ultraviolet absorbers (e.g., 2,4-dihydroxybenzo phenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone, etc.)

Component (C) can be 5% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, 30% by mass or more, or 35% by mass or more, based on the mass of the oil-in-water composition. Component (C) can be 40% by mass or less, 35% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, 15% by mass or less, or 10% by mass or less, based on the mass of the oil-in-water composition.

[(D) Aqueous solvent]

Examples of aqueous solvents include water, water-soluble alcohol, or mixtures thereof.

The water used can be that used in cosmetics, quasi-drugs, etc. For example, purified water, ion-exchanged water, tap water, etc. can be used.

The water-soluble alcohol may be, for example, at least one selected from lower alcohols, polyhydric alcohols, polyhydric alcohol polymers, dihydric alcohol alkyl ethers, dihydric alcohol alkyl ethers, dihydric alcohol ether esters, glycerin monoalkyl ethers, sugar alcohols, monosaccharides, oligosaccharides, polysaccharides, and derivatives thereof.

Examples of lower alcohols include ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol.

Examples of polyhydric alcohols include dihydric alcohols (e.g., ethylene glycol, propylene glycol, trimethylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, tetramethylene glycol, 2,3-butylene glycol, pentamethylene glycol, 2-butene-1,4-diol, hexylene glycol, octylene glycol, 1,2-hexanediol, etc.); trihydric alcohols (e.g., glycerin, trimethylolpropane, etc.); tetrahydric alcohols (e.g., pentaerythritol such as 1,2,6-hexanetriol, etc.); pentahydric alcohols (e.g., xylitol, etc.); hexahydric alcohols (e.g., sorbitol, mannitol, etc.); polyhydric alcohol polymers (e.g., diethylene glycol, dipropylene glycol, triethylene glycol, glycol, polypropylene glycol, tetraethylene glycol, diglycerin, polyethylene glycol, triglycerin, tetraglycerin, polyglycerin, etc.); sugar alcohols (e.g., sorbitol, maltitol, maltotriose, mannitol, sucrose, erythritol, glucose, fructose, starch decomposition sugar, maltose, xylitol, starch decomposition sugar reduced alcohols, etc.); glycolide; tetrahydrofurfuryl alcohol; POE-tetrahydrofurfuryl alcohol; POP-butyl ether; POP.POE-butyl ether; tripolyoxypropylene glycerin ether; POP-glycerin ether; POP-glycerin ether phosphate; POP.POE-pentaneerythritol ether, polyglycerin, etc.

Examples of monosaccharides include trioses (e.g., D-glyceryl aldehyde, dihydroxyacetone, etc.), tetraoses (e.g., D-erythrose, D-erythrulose, D-threose, erythritol, etc.), pentoses (e.g., L-arabinose, D-xylose, L-lyxose, D-arabinose, D-ribose, D-ribulose, D-xylulose, L-xylulose, etc.), hexoses (e.g., D-glucose, D-talose, D-psicose, D-galactose, D-fructose, L-galactose, L-mannose, D- The sugar may be at least one selected from the group consisting of heptose (e.g., aldoheptose, heptulose, etc.), octose (e.g., octulose, etc.), deoxy sugar (e.g., 2-deoxy-D-ribose, 6-deoxy-L-galactose, 6-deoxy-L-mannose, etc.), amino sugar (e.g., D-glucosamine, D-galactosamine, sialic acid, aminouronic acid, muramic acid, etc.), uronic acid (e.g., D-glucuronic acid, D-mannuronic acid, L-guluronic acid, D-galacturonic acid, L-iduronic acid, etc.), etc.

The oligosaccharide may be, for example, at least one selected from sucrose, gunthianose, umbelliferose, lactose, planteose, isolichinoses, α,α-trehalose, raffinose, lychinoses, umbilicin, stachyose, verbascoses, etc.

The polysaccharide may be, for example, at least one selected from cellulose, quince seed, chondroitin sulfate, starch, galactan, dermatan sulfate, glycogen, gum arabic, heparan sulfate, hyaluronic acid, tragacanth gum, keratan sulfate, chondroitin, xanthan gum, mucoitin sulfate, guar gum, dextran, keratosulfate, locust bean gum, succinoglucan, caronic acid, etc.

Other polyols include, for example, at least one selected from polyoxyethylene methyl glucoside (Glucam E-10), polyoxypropylene methyl glucoside (Glucam P-10), etc.

Component (D) can be 20% by mass or more, 30% by mass or more, 45% by mass or more, 50% by mass or more, or 60% by mass or more, based on the mass of the oil-in-water composition. Component (D) can be 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, 50% by mass or less, or 40% by mass or less, based on the mass of the oil-in-water composition.

The amount of water may be 40% by mass or more, 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, or 90% by mass or more, based on the mass of component (D). The amount of water may be 100% by mass or less, 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, or 50% by mass or less, based on the mass of component (D).

[(E) Second Powder]
The oil-in-water composition according to the first embodiment may contain a second powder in addition to the component (B). In the present disclosure, the second powder is not included in the component (B). The second powder may contain a powder that suppresses the powder squeaking caused by the first powder. The second powder may be at least one selected from the group consisting of silica, cornstarch, and cellulose.

In the second powder, the resinous powder having an average particle size of 1 μm to 20 μm is preferably 0.1 mass % or less relative to the mass of the composition, and more preferably is not actually contained in the composition (0 mass %). The resinous powder is a powder that has an oil absorption of more than 170 ml of linseed oil per 100 g of the resinous powder.

The second powder may include the following powders. Examples of the second powder include inorganic powders (e.g., talc, kaolin, mica, sericite, muscovite, phlogopite, synthetic mica, red mica, biotite, lithia mica, calcined mica, calcined talc, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, tungstate metal salts, magnesium, silica, fumed silica, zeolite, glass, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soap (e.g., zinc myristate, pas calcium aluminate, aluminum stearate, boron nitride, etc.); organic powders (e.g., polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder, cellulose powder, silicone resin powder, silk powder, wool powder, urethane powder, etc.); inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., iron oxide (red oxide), iron titanate, etc.); inorganic brown pigments (γ-iron oxide, etc.), inorganic yellow pigments (yellow iron oxide, yellow ocher, etc.), inorganic black pigments ( black iron oxide, carbon black, low-order titanium oxide, etc.), inorganic purple pigments (e.g., manganese violet, cobalt violet, etc.); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine, Prussian blue, etc.); pearl pigments (e.g., titanium oxide coated mica, titanium oxide coated bismuth oxychloride, titanium oxide coated talc, colored titanium oxide coated mica, bismuth oxychloride, fish scale foil, etc.); metal powder pigments (e.g., aluminum powder, copper powder, etc.); organic pigments such as zirconium, barium or aluminum lake (e.g., Red No. 201, Organic pigments such as Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 228, Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, and Blue No. 404, Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230, Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Green No. 3, and Blue No. 1, etc.; natural pigments (e.g., chlorophyll, β-carotene, etc.); wax powders (e.g., carnauba wax powder, etc.); starch powders (e.g., corn starch powder, rice starch powder, etc.), etc. can be used.

Component (E) can be 0.2% by mass or more, 0.5% by mass or more, 1% by mass or more, or 2% by mass or more, based on the mass of the oil-in-water composition. Component (E) can be 10% by mass or less, 5% by mass or less, 3% by mass or less, or 2% by mass or less, based on the mass of the oil-in-water composition.

[(F) Surfactant]
The oil-in-water composition according to the first embodiment may further include a surfactant. The surfactant is not limited as long as it can emulsify an oily component. Examples of the surfactant include anionic surfactants, cationic surfactants, amphoteric surfactants, hydrophilic nonionic surfactants, and lipophilic nonionic surfactants. When the oil-in-water composition is not washed off after application to the skin, the surfactant is preferably a nonionic surfactant.

Examples of anionic surfactants include fatty acid soaps (e.g., sodium laurate, sodium palmitate, etc.); higher alkyl sulfate ester salts (e.g., sodium lauryl sulfate, potassium lauryl sulfate, etc.); alkyl ether sulfate ester salts (e.g., triethanolamine POE-lauryl ether sulfate, sodium POE-lauryl ether sulfate, sodium laureth sulfate, etc.); N-acylsarcosinic acid (e.g., sodium lauroyl sarcosinate, etc.); higher fatty acid amide sulfonates (e.g., sodium N-stearoyl-N-methyl taurine, sodium N-myristoyl-N-methyl taurine, sodium cocoyl methyl taurine, sodium lauryl methyl tauride, etc.); phosphate ester salts (sodium POE-oleyl ether phosphate, sodium POE-stearyl ether phosphate, etc.); sulfosuccinates (e.g., sodium di-2-ethylhexyl sulfosuccinate, sodium monolauroyl monoethanolamide polyoxyethylene sulfosuccinate, sodium lauryl ... sodium polypropylene glycol sulfosuccinate, etc.); alkylbenzene sulfonates (e.g., sodium linear dodecylbenzene sulfonate, triethanolamine linear dodecylbenzene sulfonate, linear dodecylbenzene sulfonic acid, etc.); higher fatty acid ester sulfates (e.g., sodium hydrogenated coconut oil fatty acid glycerin sulfate, etc.); N-acyl glutamate salts (e.g., monosodium N-lauroyl glutamate, disodium N-stearoyl glutamate, monosodium N-myristoyl-L-glutamate, etc.); sulfated oils (e.g., turmeric oil, etc.); POE-alkyl ether carboxylic acids; POE-alkyl allyl ether carboxylates; α-olefin sulfonates; higher fatty acid ester sulfonates; secondary alcohol sulfates; higher fatty acid alkylolamide sulfates; sodium lauroyl monoethanolamide succinate; ditriethanolamine N-palmitoyl aspartate; sodium caseinate, etc. can be used.

Examples of cationic surfactants include alkyl trimethyl ammonium salts (e.g., stearyl trimethyl ammonium chloride, lauryl trimethyl ammonium chloride, etc.); alkyl pyridinium salts (e.g., cetyl pyridinium chloride, etc.); dialkyl dimethyl ammonium salts (e.g., distearyl dimethyl ammonium chloride); poly(N,N'-dimethyl-3,5-methylene piperidinium) chloride; alkyl quaternary ammonium salts; alkyl dimethyl benzyl ammonium salts; alkyl isoquinolinium salts; dialkyl morphonium salts; POE-alkyl amines; alkyl amine salts; polyamine fatty acid derivatives; amyl alcohol fatty acid derivatives; benzalkonium chloride; benzethonium chloride, etc.

Examples of amphoteric surfactants include imidazoline-based amphoteric surfactants (e.g., 2-undecyl-N,N,N-(hydroxyethylcarboxymethyl)-2-imidazoline sodium, 2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, etc.); betaine-based surfactants (e.g., 2-heptadecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, lauryl dimethylaminoacetic acid betaine, alkyl betaine, amido betaine, sulfobetaine, etc.).

Examples of hydrophilic nonionic surfactants include POE-sorbitan fatty acid esters (e.g., POE-sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan monooleate, POE-sorbitan tetraoleate, etc.); POE-sorbitol fatty acid esters (e.g., POE-sorbitol monolaurate, POE-sorbitol monooleate, POE-sorbitol pentaoleate, POE-sorbitol monostearate, etc.); POE-glycerin fatty acid esters (e.g., POE-glycerin monostearate, POE-monooleates such as POE-glycerol monoisostearate, POE-glycerol triisostearate, etc.); POE-fatty acid esters (e.g., POE-distearate, POE-monodioleate, ethylene glycol distearate, etc.); POE-alkyl ethers (e.g., POE-lauryl ether, POE-oleyl ether, POE-stearyl ether, POE-behenyl ether, POE-2-octyldodecyl ether, POE-cholestanol ether, etc.); Pluronic types (e.g., Pluronic (registered trademark) trademarks), etc.); POE·POP-alkyl ethers (e.g., POE·POP-cetyl ether, POE·POP-2-decyltetradecyl ether, POE·POP-monobutyl ether, POE·POP-hydrogenated lanolin, POE·POP-glycerin ether, etc.); tetraPOE·tetraPOP-ethylenediamine condensates (e.g., Tetronic, etc.); POE-castor oil hydrogenated castor oil derivatives (e.g., POE-castor oil, POE-hydrogenated castor oil, POE-hydrogenated castor oil monoisostearate, POE-hydrogenated castor oil triisostearate, POE POE-hydrogenated castor oil monopyroglutamic acid monoisostearate diester, POE-hydrogenated castor oil maleic acid, etc.); POE-beeswax/lanolin derivatives (e.g., POE-sorbitol beeswax, etc.); alkanolamides (e.g., coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, fatty acid isopropanolamide, etc.); POE-propylene glycol fatty acid esters; POE-alkylamines; POE-fatty acid amides; sucrose fatty acid esters; alkylethoxydimethylamine oxide; trioleyl phosphate, etc.

Examples of lipophilic nonionic surfactants include sorbitan fatty acid esters (e.g., sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, diglycerol sorbitan penta-2-ethylhexyl acid, diglycerol sorbitan tetra-2-ethylhexyl acid, etc.); glycerin polyglycerin fatty acid (e.g., glycerin monocottonseed oil fatty acid, glycerin monoerucate, glycerin sesquioleate, glycerin monostearate, α,α'-glycerin oleate pyroglutamate, glycerin monostearate malate, etc.); propylene glycol fatty acid esters (e.g., propylene glycol monostearate, etc.); hydrogenated castor oil derivatives; glycerin alkyl ethers, etc.

The surfactant may be, for example, 0.2% by mass or more, 0.5% by mass or more, or 1% by mass or more, based on the mass of the oil-in-water composition. The surfactant may be, for example, 5% by mass or less, 3% by mass or less, or 2% by mass or less, based on the mass of the oil-in-water composition.

[(G) Others]
The oil-in-water composition of the present disclosure may contain other components as needed, such as oily components other than those described above, thickeners, moisturizers, film-forming agents, water-soluble ultraviolet absorbers, sequestering agents, amino acids, organic amines, polymer emulsions, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant assistants, fragrances, and the like, within the scope that does not impair the effects of the present disclosure.

Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, Ibota wax, montan wax, bran wax, kapok wax, sugarcane wax, hexyl laurate, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE cholesterol ether, POE hydrogenated lanolin alcohol ether, liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, microcrystalline wax, and Fischer-Tropsch wax.

Examples of liquid oils include avocado oil, camellia oil, macadamia nut oil, corn oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, triglycerin, etc.

Examples of solid fats and oils include cocoa butter, coconut oil, hardened coconut oil, palm oil, palm kernel oil, Japan wax kernel oil, hardened oil, Japan wax kernel oil, hardened oil, Japan wax, and hardened castor oil.

Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tallic acid, isostearic acid, linoleic acid, linoleic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

Natural water-soluble polymers include, for example, plant-based polymers (e.g., gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed, algae colloids (cassou extract), starch (rice, corn, potato, wheat), glycyrrhizic acid); microbial-based polymers (e.g., xanthan gum, dextran, succinoglucan, pullulan, etc.); etc.

Examples of semi-synthetic water-soluble polymers include starch-based polymers (e.g., carboxymethyl starch, methylhydroxypropyl starch, etc.); cellulose-based polymers (methyl cellulose, ethyl cellulose, methylhydroxypropyl cellulose, hydroxyethyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, crystalline cellulose, cellulose powder, etc.); and alginic acid-based polymers (e.g., sodium alginate, propylene glycol alginate, etc.).

Examples of thickening agents include gum arabic, carrageenan, karaya gum, tragacanth gum, carob gum, quince seed, casein, dextrin, gelatin, sodium pectinate, sodium alginate, methylcellulose, ethylcellulose, carboxymethylcellulose (CMC), hydroxyethylcellulose, hydroxypropylcellulose, polyvinyl alcohol (PVA), polyvinyl methyl ether (PVM), PVP (polyvinylpyrrolidone), sodium polyacrylate, carboxyvinyl polymer, locust bean gum, guar gum, tamarind gum, dialkyldimethylammonium cellulose sulfate, xanthan gum, magnesium aluminum silicate, bentonite, hectorite, magnesium aluminum silicate (beegum), laponite, silicic anhydride, synthetic taurate polymers, synthetic acrylate polymers, etc.

Examples of moisturizing agents include polyethylene glycol, propylene glycol, glycerin, 1,3-butylene glycol, xylitol, sorbitol, maltitol, diglycerin (EO)PO adduct, Rosa rugosa extract, Achillea millefolium extract, and Melilot extract.

Examples of coating agents include polymeric silicone, silicone resin, trimethylsiloxysilicate, etc.

Examples of water-soluble UV absorbers include benzophenone-based UV absorbers (e.g., 2-hydroxy-4-methoxybenzophenone-5-sulfonate, etc.), benzylidene camphor-based UV absorbers (benzylidene camphorsulfonic acid, terephthalidenedichamphorous acid, etc.), and phenylbenzimidazole-based UV absorbers (phenylbenzimidazole sulfonic acid, etc.).

Examples of sequestering agents include 1-hydroxyethane-1,1-diphosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid tetrasodium salt, disodium edetate, trisodium edetate, tetrasodium edetate, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetic acid, trisodium ethylenediaminehydroxyethyltriacetate, etc.

Examples of amino acids include neutral amino acids (e.g., threonine, cysteine, etc.); basic amino acids (e.g., hydroxylysine, etc.); and the like. Examples of amino acid derivatives include sodium acyl sarcosine (sodium lauroyl sarcosine), acyl glutamate, sodium acyl β-alanine, glutathione, pyrrolidone carboxylic acid, etc.

Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

Examples of polymer emulsions include acrylic resin emulsions, polyethyl acrylate emulsions, acrylic resin liquids, polyacrylic alkyl ester emulsions, polyvinyl acetate resin emulsions, and natural rubber latex.

Examples of pH buffers include lactic acid-sodium lactate, citric acid-sodium citrate, and succinic acid-sodium succinate.

Examples of vitamins include vitamin A, B ₁ , B ₂ , B ₆ , C, E or derivatives thereof, pantothenic acid or derivatives thereof, biotin, and the like.

Examples of antioxidants include tocopherols, dibutylhydroxytoluene, butylhydroxyanisole, and gallic acid esters.

Examples of antioxidant aids include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, ethylenediaminetetraacetic acid, etc.

Other possible ingredients include, for example, preservatives (ethylparaben, butylparaben, chlorphenesin, phenoxyethanol, etc.); anti-inflammatory agents (for example, glycyrrhizic acid derivatives, glycyrrhetinic acid derivatives, salicylic acid derivatives, hinokitiol, zinc oxide, allantoin, etc.); skin whitening agents (for example, placenta extract, saxifrage extract, arbutin, etc.); various extracts (for example, Phellodendron bark, Coptis japonica, Lithospermum root, Peony root, Swertia japonica, Birch, Sage, Loquat, Carrot, Aloe, Mallow, Iris, Grape, Coix seed, Loofah, Lily, Saffron, Cnidium rhizome, Ginger, Hypericum perforatum, Ononis, Garlic, Capsicum annuum, Citrus aurantium, Tomentosum, float, seaweed, etc.), activators (for example, royal jelly, photosensitizers, cholesterol derivatives, etc.); blood circulation promoters (for example, vanillylamide nonylate, nicotinic acid benzyl ester, nicotinic acid β-butoxyethyl ester, capsaicin, zingerone, cantharides tincture, ichthammol, tannic acid, α-borneol, tocopherol nicotinate, inositol hexanicotinate, cyclandelate, cinnarizine, tolazoline, acetylcholine, verapamil, cepharanthine, γ-oryzanol, etc.); antiseborrheic agents (for example, sulfur, thianthol, etc.); anti-inflammatory agents (for example, tranexamic acid, thiotaurine, hypotaurine, etc.), etc.

Furthermore, the compositions of the present disclosure may also contain, as appropriate, caffeine, tannin, verapamil, tranexamic acid or a derivative thereof, various herbal extracts such as licorice, quince, and Japanese anemone, drugs such as tocopherol acetate, glycyrrhizic acid, glycyrrhizic acid or a derivative thereof, or a salt thereof, skin whitening agents such as vitamin C, magnesium ascorbyl phosphate, ascorbyl glucoside, arbutin, and kojic acid, amino acids such as arginine and lysine or derivatives thereof, and glucoxyl hesperidin.

[Production method]
The method for producing the oil-in-water composition of the present disclosure will be described. The oil-in-water composition of the present disclosure can be produced by a known method. For example, the production method can include a step of mixing component (A), component (B) and component (C) to prepare an oil phase, and a step of emulsifying the oil phase in component (D) using a surfactant.

In the oil-in-water composition of the present disclosure, it may be difficult or impractical to directly identify the phase structure, emulsion form, etc., by the composition. In such cases, the oil-in-water composition of the present disclosure should be allowed to be identified by its manufacturing method.

In the oil-in-water composition of the present disclosure, squeaking caused by hydrophobic powder is suppressed when the oil-in-water composition is applied to the skin. For example, in the oil-in-water composition of the present disclosure, even if the hydrophobic powder has low oil absorption, the semi-solid oil in the oil phase suppresses aggregation of the hydrophobic powder on the skin without adding a powder with high oil absorption. This suppresses squeaking during application, allowing the user to obtain a comfortable application sensation. In addition, since there is no need to add a powder to suppress squeaking in the oil-in-water composition of the present disclosure, the user can obtain a moist sensation due to the semi-solid oil after application to the skin.

The oil-in-water composition of the present disclosure can be applied, for example, to skin topical preparations. The oil-in-water composition of the present disclosure can be applied, for example, to base cosmetics, topcoat cosmetics, makeup cosmetics, antiperspirants, deodorants, sunscreen cosmetics, skin care agents, cleansers, etc.

The oil-in-water composition of the present disclosure will be described below with reference to examples. However, the oil-in-water composition of the present disclosure is not limited to the following examples. The content of each component shown in each table is expressed in mass%.

[Test Examples 1 to 15]
The following skin topical compositions (sunscreen cosmetics), which are oil-in-water compositions, were prepared and evaluated for powderiness when applied to the skin and moisturizing feeling after application to the skin. The evaluation method and evaluation criteria for each test item are shown below. Tables 1 to 4 show the composition and evaluation of each skin topical composition.

[No squeaking when applied]
A panel of 10 experts evaluated whether the samples felt powdery when applied to the arm. Each evaluation item was scored according to the number of people.
A: Three or fewer panelists felt a powdery sensation upon application;
B: 4 to 6 panelists felt a powdery squeaking sensation upon application;
C: Seven or more panelists felt a powdery creak upon application.

[Moisturizing feeling after application]
A panel of 10 experts evaluated whether the samples had a moist feeling after application to the arms. Each evaluation item was scored according to the number of assessors.
A: Seven or more panelists felt a moist feeling after application;
B: 4 to 6 panelists felt a moist feeling after application;
C: Three or fewer panelists felt a moist feeling after application.

[Test Examples 1 to 9]
In Test Examples 1 to 9, the type of semi-solid oil was changed. In Test Examples 1 to 4, which contained semi-solid oil with a melting point of 40 to 50° C., good evaluations were obtained even when hydrophobized zinc oxide with low oil absorption was used. In particular, in Test Examples 1 and 2, which used palm-derived oil with a melting point of 44° C. to 50° C., the moist feeling could be further improved. On the other hand, in Test Example 5, in which an oil with a high melting point was added instead of the semi-solid oil, and Test Examples 6 and 7, in which a liquid polyhydric alcohol was added, high evaluations were not obtained, similar to Test Examples 8 and 9, in which no oil equivalent to component (A) was added.

[Test Examples 10 to 11]
In Test Examples 10 and 11, hydrophilic treated titanium oxide coated with silica was used instead of hydrophobic treated powder. Compared with Test Examples 1 and 2, the evaluations of Test Examples 10 and 11 were lower. In Test Examples 10 and 11, the hydrophilic treated powder was dispersed in the aqueous phase (exterior), so the action of the semi-solid oil was not obtained, and it is considered that the oil-in-water composition was applied to the skin, and when the volatile components in the aqueous phase volatilized, it aggregated, which deteriorated the feeling of use. On the other hand, in Test Examples 1 and 2, the hydrophobic treated powder was dispersed in the oil phase (inner phase), so it is considered that the semi-solid oil suppressed the aggregation of the hydrophobic treated powder, thereby reducing the powdery creaking during application. In addition, it is considered that the semi-solid oil applied was softened by body temperature, so that the semi-solid oil slowly spread and the user was able to get a moist feeling.

[Test Examples 12 to 15]
In Test Examples 12 to 15, the contents of the semi-solid oil and the hydrophobized powder were changed. In Test Examples 13 and 14, the same good evaluations as in Test Example 1 were obtained. On the other hand, Test Example 12, which had a low semi-solid oil content, was evaluated as having powdery squeaks. From this, it is considered that the semi-solid oil content is preferably 0.8% by mass or more relative to the mass of the oil-in-water composition. Also, in Test Example 15, which had a high semi-solid oil content, the moist feeling was rated low. From this, it is considered that the semi-solid oil content is preferably 3.5% by mass or less relative to the mass of the oil-in-water composition.

The oil-in-water composition of the present invention has been described based on the above embodiments and examples, but is not limited to the above embodiments and examples, and may include various modifications, changes, and improvements to each of the disclosed elements (including elements described in the claims, specification, and drawings) within the scope of the present invention and based on the basic technical concept of the present invention. Furthermore, various combinations, substitutions, and selections of each of the disclosed elements are possible within the scope of the claims of the present invention.

Further objects, objectives and forms (including modifications) of the present invention will become apparent from the entire disclosure of the present invention, including the claims.

Regarding the numerical ranges set forth in this document, any numerical value or range falling within the range should be construed as being specifically set forth in this document, even if not otherwise specified.

A part or all of the above-described embodiments may be described as, but are not limited to, the following supplementary notes. Each supplementary note may be combined with each claim in the claims.
[Appendix 1]
A method of using the oil-in-water composition of the present disclosure, comprising using the oil-in-water composition as an external skin preparation.
[Appendix 2]
A method for using the oil-in-water composition of the present disclosure as a sunscreen cosmetic.

The oil-in-water composition of the present disclosure can be used, for example, in cosmetics and cleansing agents that are applied to the skin. For example, the oil-in-water composition of the present disclosure can be used in base cosmetics, topcoat cosmetics, makeup cosmetics, antiperspirants, deodorants, sunscreen cosmetics, skin care agents, cleansing agents, and the like.

Claims (7)

(A) a first oil component consisting of a semi-solid oil having a melting point of 40°C to 50°C;
(B) a first powder having a hydrophobic particle surface;
(C) a second oil component comprising a liquid oil component;
(D) an aqueous solvent,
The component (A) is at least one of palm-derived oil and myristyl myristate,
The component (B) is a hydrophobized metal oxide having an average primary particle size of 5 nm to 50 nm,
The component (B) is present in an amount of 6% by weight to 20% by weight based on the weight of the composition;
The component (A) is 0.04 to 0.4 parts by mass per 1 part by mass of the component (B). The oil-in-water composition according to claim 1, wherein the component (C) is present in an amount of 5% by mass to 25% by mass relative to the mass of the composition. The oil-in-water composition according to claim 1 or 2, wherein the palm-derived oil is a mixture of at least one of palm oil and palm kernel oil and hydrogenated palm oil. The oil-in-water composition according to any one of claims 1 to 3, wherein the component (A) is 0.1 to 0.4 parts by mass per 1 part by mass of the component (B). The oil-in-water composition according to any one of claims 1 to 4, wherein the component (A) is present in an amount of 0.8% by mass to 3.5% by mass relative to the mass of the composition. The oil-in-water composition according to any one of claims 1 to 5 , wherein the component (C) comprises an oil-soluble UV absorber. The oil-in-water composition according to any one of claims 1 to 6 , which is applied to an external preparation for skin.