Oil-in-water emulsion-based composition

Abstract

To provide an oil-in-water emulsion-based composition that enables oil-in-water emulsion-based milky lotion or cream with smooth use feeling to retain stable emulsion system, while giving the skin a noticeable firmness, which can be sensed instantly after its application.SOLUTION: The present invention provides an oil-in-water emulsion-based composition, which comprises a component (a) hydrogenated polyisobutylene as a film-forming agent, and a component (b) a humectant that is solid at 25°C and has a molecular weight of 500-4000, and the mass ratio of the component (a) to the component (b) is in the range of 1.4: 1 to 1: 30. According to the present invention, by adding specific amounts of a specific film forming agent and a specific solid humectant (i.e. the inventive oil-in-water emulsion-based composition) to oil-in-water emulsion-based cosmetic, particularly oil-in-water emulsion-based cosmetic with smooth use feeling, it becomes possible to stabilize the emulsification system and provide oil-in-water emulsion-based cosmetic that noticeably enhances skin firmness.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a composition for an oil-in-water emulsion system, particularly an oil-in-water emulsion type emulsion having a smooth feeling in use, a cream, and a composition for an oil-in-water emulsion type cosmetic that can maintain a stable emulsion system and at the same time provide a clear firmness of the skin.

Background Art

[0002] The oil-in-water emulsion system is a common dosage form in cosmetics, and commonly used ones mainly include emulsions, creams, etc. For oil-in-water emulsion type cosmetics, various functions are required according to the purpose of use, among which stability is essential. Recently, there has been a demand for oil-in-water emulsion type cosmetics that have a smooth feeling in use and at the same time have firmness and stability.

[0003] In order to obtain a firmness effect from oil-in-water emulsion type cosmetics, in the prior art, there has been a proposal to add a film-forming agent to the oil-in-water emulsion type cosmetics. It has already been known that a film-forming agent mixed with an anti-wrinkle agent made of a polymer with strong shrinkage force includes, for example, polyurethane (see Patent Document 1). In addition, there has already been known a proposal to form a film with strong shrinkage force using film-forming polymers such as acrylic resins, vinyl acetate resins, polyethylene resins, silicone resins, polyvinyl resins, polyvinyl alcohol, acrylic water-soluble resins, cellulose water-soluble resins, starch and its derivatives, gelatin, and sodium alginate (for example, see Patent Document 2).

[0004] However, using a large amount of film-forming agent in cosmetics can obtain a firmness effect, but it causes deterioration of the stability of the oil-in-water emulsion type cosmetics, and there are problems such as delamination, precipitation, gelation, etc., resulting in poor stability and stickiness.

[0005] When the amount of the film-forming agent used is reduced, the problems of stability and feeling in use are solved, but as the dosage of the film-forming agent is reduced, the firmness effect of the oil-in-water emulsion type cosmetics also disappears.

[0006] Prior art documents

[0007] Patent Documents

[0008] Patent document 1: Japan Special Publication Publication No. 11-504949

[0009] Patent Document 2: Japanese Patent Application Publication No. 5-933 [Overview of the project]

[0010] Problems that the invention aims to solve

[0011] This invention has been submitted in view of the above-mentioned prior art, and the problem it aims to solve is to provide an oil-in-water emulsion composition that maintains a stable emulsion system in an oil-in-water emulsion emulsion or cream with a smooth feel, while simultaneously providing a noticeable firming sensation to the skin, and in particular, a firming sensation that can be felt immediately after application.

[0012] Means for solving the problem

[0013] To solve the above problems, the inventors conducted extensive research and investigations, and as a result, discovered that by adding a specific film-forming agent and a solid humectant in a specific ratio to an oil-in-water emulsion cosmetic, an oil-in-water emulsion cosmetic with a smooth feel, a stable emulsion, and a noticeable improvement in skin firmness can be obtained. Specifically, by simultaneously adding component (a) hydrogenated polyisobutene as a film-forming agent and component (b) a humectant with a molecular weight of 500 to 4000 that is solid at 25°C to an oil-in-water emulsion cosmetic, and by having a mass ratio of component (a) to component (b) within the range of 1.4:1 to 1:30, an oil-in-water emulsion cosmetic with a smooth feel, a stable emulsion, and a noticeable improvement in skin firmness can be obtained, thus completing the present invention.

[0014] In other words, the present invention includes the following:

[0015] [1] A composition for an oil-in-water emulsion system,

[0016] Component (a) Hydrogenated polyisobutene as a film-forming agent,

[0017] Component (b) contains a humectant with a molecular weight of 500 to 4000 that is solid at 25°C,

[0018] A composition for an oil-in-water emulsion system, characterized in that the mass ratio of component (a) to component (b) is within the range of 1.4:1 to 1:30.

[0019] [2] The oil-in-water emulsion composition according to [1] above, characterized in that the mass ratio of component (a) to component (b) is in the range of 1:2.5 to 1:10.

[0020] [3] An oil-in-water emulsion cosmetic, characterized by containing the oil-in-water emulsion composition described in either [1] or [2].

[0021] [4] The oil-in-water emulsion cosmetic according to [3], characterized in that the content of component (a) in the cosmetic is 0.1% by mass to 0.7% by mass.

[0022] [5] The oil-in-water emulsion cosmetic according to [3] or [4], characterized in that the content of component (b) in the cosmetic is 0.5% to 3% by mass.

[0023] [6] Use of the oil-in-water emulsion composition described in [1] in the production of an oil-in-water emulsion cosmetic that combines a smooth feel, firmness, and stability.

[0024] Effects of the invention

[0025] The composition for an oil-in-water emulsion system according to the present invention simultaneously contains component (a) hydrogenated polyisobutene as a film-forming agent and component (b) a humectant having a molecular weight of 500 to 4,000 and being solid at 25°C, and when applied to a cosmetic of an oil-in-water emulsion system, the mass ratio of the component (a) to the component (b) is within the range of 1.4:1 to 1:30, so that the resulting oil-in-water emulsion cosmetic can have a smooth feeling in use while having a firmness and good stability. The firming effect is an immediate firming effect with immediate efficacy. The oil-in-water emulsion cosmetic obtained by adding the composition for an oil-in-water emulsion system of the present invention has both a firming effect and good stability at the same time, and is a safe, effective and reliable product.

Embodiments for Carrying out the Invention

[0026] Specific Embodiments Hereinafter, the present invention will be described in detail, but the present invention is not limited thereto.

[0027] [Composition for Oil-in-Water Emulsion System]

[0028] The composition for an oil-in-water emulsion system of the present invention

[0029] contains component (a) hydrogenated polyisobutene as a film-forming agent,

[0030] and component (b) a humectant having a molecular weight of 500 to 4,000 and being solid at 25°C,

[0031] and is characterized in that the mass ratio of the component (a) to the component (b) is within the range of 1.4:1 to 1:30.

[0032] As component (a), a film-forming agent, a specific film-forming agent called hydrogenated polyisobutene is used. There are no special limitations on the molecular weight of the hydrogenated polyisobutene, and hydrogenated polyisobutene commonly used in the cosmetics field can be used. Specifically, examples include deodorizing polybutene P200SH (trade name) and deodorizing polybutene P (trade name) manufactured by Nikko Rica Japan; Parleam24 (trade name) manufactured by Showa Oita Plant, Japan; and Panalane H-300E (trade name) manufactured by Herbalife, USA. One type of hydrogenated polyisobutene may be used, or a combination of two or more types may be used, but it is preferable to use one type.

[0033] The humectant component (b), which is a solid at 25°C with a molecular weight of 500 to 4000, can be any humectant commonly used in the cosmetics field that satisfies the requirements for molecular weight and solid form at room temperature, and is not particularly limited. Examples include PEG1000 (sometimes called PEG-20), PEG1500, PEG2000, PEG3350, and PEG4000 (sometimes called PEG-75). These solid humectants may be used individually or in combination of two or more types.

[0034] Regarding the content of components (a) and (b), in the oil-in-water emulsion composition, the mass ratio of component (a) to component (b) should be within the range of 1.4:1 to 1:30, and preferably within the range of 1:2.5 to 1:10.

[0035] [Oil-in-water emulsion type cosmetic]

[0036] The oil-in-water emulsion cosmetic composition of the present invention comprises the above-mentioned oil-in-water emulsion composition, and the characteristics of the oil-in-water emulsion composition are:

[0037] Component (a) Hydrogenated polyisobutene as a film-forming agent,

[0038] Component (b) contains a humectant with a molecular weight of 500 to 4000 that is solid at 25°C,

[0039] The mass ratio of component (a) to component (b) is characterized in that it is within the range of 1.4:1 to 1:30.

[0040] Furthermore, regarding the content of component (a) film-forming agent, when the oil-in-water emulsion composition is added to an oil-in-water emulsion cosmetic, the content in the cosmetic is 0.1% to 0.7% by mass, preferably 0.1% to 0.5% by mass. If the content of hydrogenated polyisobutene as component (a) film-forming agent in the oil-in-water emulsion cosmetic is less than 0.1% by mass, it will not be able to exert the effect of giving the cosmetic a firming sensation. If the content of component (a) in the oil-in-water emulsion cosmetic exceeds 0.7% by mass, separation, layering, gelation, etc. may occur in the oil-in-water emulsion cosmetic, leading to poor stability and potentially causing stickiness.

[0041] Furthermore, regarding the content of component (b), the solid humectant, when the oil-in-water emulsion composition is added to an oil-in-water emulsion cosmetic, the content in the cosmetic is 0.5% to 3% by mass, preferably 0.5% to 2.5% by mass, and more preferably 0.5% to 1% by mass. If the content of component (b), the solid humectant, in the oil-in-water emulsion cosmetic is less than 0.5% by mass, it will not be able to exert the effect of providing firmness and stability to the cosmetic through a synergistic effect with the film-forming agent. If the content of component (b) in the oil-in-water emulsion cosmetic exceeds 3% by mass, separation, layering, gelation, etc., may occur in the oil-in-water emulsion cosmetic, leading to poor stability and potentially causing stickiness.

[0042] Furthermore, the oil-in-water emulsion cosmetic composition of the present invention preferably has a viscosity of 50,000 Pa·s or less, and more preferably has a viscosity of 10,000 Pa·s or less.

[0043] The oil-in-water emulsion cosmetic composition of the present invention may contain other components as needed, such as aqueous solvents, oily components, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, water-soluble polymers, thickeners, preservatives, UV absorbers, metal ion chelating agents, amino acids, organic amines, polymer emulsions, pH adjusters, neutralizing agents, skin nutrients, vitamins, antioxidants, antioxidant aids, fragrances, etc., to the extent that they do not impair the effects of the present invention.

[0044] Examples of aqueous solvents include water, alcohol, humectants, or mixtures thereof.

[0045] As for the water used, water used in cosmetics, quasi-drugs, etc., can be used, such as purified water, ion-exchanged water, or tap water. The aqueous phase may further contain water-soluble alcohols depending on the purpose.

[0046] Examples of water-soluble alcohols include at least one selected from lower alcohols, polyhydric alcohols, polyhydric alcohol polymers, dihydric alcohol alkyl ethers, dihydric alcohol ether esters, glycerol monoalkyl ethers, sugar alcohols, monosaccharides, oligosaccharides, polysaccharides, and their derivatives.

[0047] Examples of lower alcohols include ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol.

[0048] 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, etc.); trihydric alcohols (e.g., glycerin, trimethylolpropane, etc.); tetrahydric alcohols (e.g., pentaerythritol, etc.); pentahydric alcohols (e.g., xylitol, etc.); and hexahydric alcohols (e.g., sorbitol, mannitol, etc.).

[0049] Examples of polyhydric alcohol polymers include diethylene glycol, dipropylene glycol, triethylene glycol, polypropylene glycol, tetraethylene glycol, diglycerin, triglycerin, and tetraglycerin.

[0050] Examples of dihydric alcohol alkyl ethers include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monophenyl ether, ethylene glycol monohexyl ether, ethylene glycol mono-2-methylhexyl ether, ethylene glycol isoamyl ether, ethylene glycol benzyl ether, ethylene glycol isopropyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, etc.; diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol butyl ether, diethylene glycol methyl ethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, propylene glycol isopropyl ether, dipropylene glycol methyl ether, dipropylene glycol ethyl ether, dipropylene glycol butyl ether, etc.

[0051] Examples of dihydric alcohol ether esters include ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monophenyl ether acetate, ethylene glycol diazibate, ethylene glycol disuccinate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, and propylene glycol monophenyl ether acetate.

[0052] Examples of glycerin monoalkyl ethers include xyl alcohol, ceracyl alcohol, and batyl alcohol.

[0053] Examples of sugar alcohols include sorbitol, maltitol, maltotriose, mannitol, sucrose, erythritol, glucose, fructose, starch-derived sugars, maltose, xylitol, starch-derived sugar-reduced alcohols, etc.; 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, etc.

[0054] Examples of monosaccharides include trioses (e.g., D-glyceryl aldehyde, dihydroxyacetone, etc.), tetraoses (e.g., D-erythritol, D-erythritol, D-threose, erythritol, etc.), pentoses (e.g., L-arabinose, D-xylose, L-lyxose, D-arabinose, D-ribose, D-ribose, D-xylulose, L-xylulose, etc.), and hexoses (e.g., D-glucose, D-talose, D-busicose, D-galactose, D-fructose, L-galactose, L- At least one can be selected from the following: -mannose, D-tagatose, etc., heptasaccharides (e.g., aldoheptose, hepros, etc.), octasaccharides (e.g., octulose, etc.), deoxysaccharides (e.g., 2-deoxy-D-ribose, 6-deoxy-L-galactose, 6-deoxy-L-mannose, etc.), aminosaccharides (e.g., D-glucosamine, D-galactosamine, sialic acid, muramic acid, etc.), uronic acids (e.g., D-glucuronic acid, L-guluronic acid, D-galacturonic acid, L-iduronic acid, etc.).

[0055] Examples of oligosaccharides include at least one selected from sucrose, umbelliferose, lactose, planteose, α,α-trehalose, and others.

[0056] Examples of polysaccharides include 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, locust bean gum, succinoglucan, carotenoid acid, etc.

[0057] Other polyols include, for example, at least one selected from polyoxyethylene methyl glucoside (glucam E-10), polyoxypropylene methyl glucoside (glucam P-10), and the like.

[0058] Examples of humectants include propylene glycol, glycerin, 1,3-butylene glycol, dipropylene glycol, xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucoitin sulfate, carotenoid acid, atelocollagen, sodium lactate, bile salts, dl-pyrrolidone carboxylate, alkylene oxide derivatives, short-chain soluble collagen, diglycerin (EO)PO adducts, Rosa rugosa extract, Achillea millefolium extract, and Melilotus extract.

[0059] Examples of oily components that can be used include liquid oils and fats, solid oils and fats, waxes, hydrocarbons, higher fatty acids, higher alcohols, synthetic ester oils, and silicone oils. In this document, the term "oily components" includes both oils and oil-soluble components.

[0060] Examples of liquid oils include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, peach kernel oil, wheat germ oil, sasanqua oil, castor oil, linseed oil, safflower oil, cottonseed oil, elm oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, cinnamon oil, Japanese tuni oil, jojoba oil, wheat germ oil, and triglycerin.

[0061] Examples of solid fats and oils include cocoa butter, coconut oil, horse fat, hydrogenated coconut oil, palm oil, beef tallow, sheep fat, hydrogenated beef tallow, palm kernel oil, lard, beef bone fat, Japanese wax kernel oil, hydrogenated oil, beef tallow, Japanese wax, and hydrogenated castor oil.

[0062] Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, privet wax, whale wax, montan wax, rice bran wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugarcane wax, isopropyl lanolin fatty acid, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.

[0063] Examples of hydrocarbon oils include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, and microcrystalline wax.

[0064] Examples of high-grade fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tallic acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

[0065] Examples of higher alcohols include straight-chain alcohols (e.g., lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, etc.) and branched-chain alcohols (e.g., monostearyl glycerol ether (batyl alcohol), 2-decyltetradecinol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.).

[0066] Synthetic ester oils include hydrogenated polydecene, 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, glyceryl di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate Slitol, glyceryl tri-2-ethylhexanoate, glyceryl trioctanoate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimiristate, glyceride tri-2-heptylundecanoate, methyl castor oil fatty acid ester, oleyl oleate, acetoglyceride, 2-ethyl palmitate Examples include butylundecyl, 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.

[0067] Examples of silicone oils include polydimethylsiloxane, methylhydrogenpolysiloxane, methylphenylpolysiloxane, stearoxymethylpolysiloxane, polyether-modified organopolysiloxane, fluoroalkyl / polyoxyalkylene-comodified organopolysiloxane, alkyl-modified organopolysiloxane, unterminated modified organopolysiloxane, fluorine-modified organopolysiloxane, amino-modified organopolysiloxane, PEG-10 polydimethylsiloxane, silicone gel, acrylic silicone, trimethylsiloxysilicate, silicone RTV rubber, and other silicone compounds.

[0068] When using an oil in combination with hydrogenated polyisobutene, it is preferable to use an oil that has poor affinity for hydrogenated polyisobutene and is highly volatile. In this case, the volatile oil will evaporate during application, and because of its poor affinity for hydrogenated polyisobutene, it will remain on the skin, forming a film and providing a firming effect.

[0069] Examples of anionic surfactants include fatty acid soaps (e.g., sodium laurate, sodium palmitate, etc.); higher alkyl sulfate salts (e.g., sodium lauryl sulfate, potassium lauryl sulfate, etc.); alkyl ether sulfate salts (e.g., POE-triethanolamine lauryl sulfate, POE-sodium lauryl sulfate, etc.); N-acyl sarcosinate (e.g., sodium lauroyl sarcosinate, etc.); higher fatty acid amide sulfonates (e.g., sodium N-myristoyl-N-methyltaurate, sodium coconut oil fatty acid methyl taulide, sodium lauryl methyl taulide, etc.); phosphate salts (e.g., sodium POE-oleyl ether phosphate, POE-stearyl ether phosphate, etc.); sulfosuccinates (e.g., sodium di-2-ethylhexyl sulfosuccinate, sodium monolauroyl monoethanolamide polyoxyethylene sulfosuccinate, sodium lauryl polypropylene glycol sulfosuccinate, sodium Examples include: sodium ammonium compounds, alkylbenzene sulfonates (e.g., linear dodecylbenzenesulfonate sodium, linear dodecylbenzenesulfonate triethanolamine, linear dodecylbenzenesulfonate, etc.); higher fatty acid ester sulfates (e.g., hydrogenated coconut oil fatty acid glycerin sulfate sodium, etc.); N-acyl glutamates (e.g., N-lauroyl glutamate monosodium, N-stearoyl glutamate disodium, N-myristoyl-L-glutamate monosodium, etc.); sulfurized oils (e.g., belladonna oil, etc.); POE-alkyl ether carboxylic acids; POE-alkyl allyl ether carboxylic acid salts; α-olefin sulfonates; higher fatty acid ester sulfonates; secondary alcohol sulfates; higher fatty acid alkylolamide sulfates; lauroyl monoethanolamide succinate sodium; N-palmitoyl aspartate ditriethanolamine; sodium caseinate; potassium cetyl phosphate, etc.

[0070] Examples of cationic surfactants include alkyltrimethylammonium salts (e.g., stearyltrimethylammonium chloride, lauryltrimethylammonium chloride, etc.); alkylpyridinium salts (e.g., cetylpyridinium chloride, etc.); distearyldimethylammonium chloride dialkyldimethylammonium salt; poly(N,N'-dimethyl-3,5-methylenepiperidinium) chloride; alkylquaternary ammonium salts; alkyldimethylbenzylammonium salts; alkylisoquinolinium salts; dialkylmolyphonium salts; POE-alkylamines; alkylamine salts; polyamine fatty acid derivatives; amyl alcohol fatty acid derivatives; benzalkonium chloride; benzethonium chloride, etc.

[0071] 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.); and betaine-based surfactants (e.g., 2-heptadecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, lauryldimethylaminoacetic acid betaine, alkyl betaine, amide betaine, sulfobetaine, etc.).

[0072] 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, sorbitan penta-2-ethylhexylate diglycerol sorbitan, sorbitan tetra-2-ethylhexylate diglycerol sorbitan, etc.); glycerin polyglycerin fatty acids (e.g., monocottonseed oil fatty acid glycerin, monoerucate glycerin, sesquioleate glycerin, monostearate glycerin, α,α'-oleate pyroglutamate glycerin, monostearate glycerin malic acid, etc.); propylene glycol fatty acid esters (e.g., propylene glycol monostearate, etc.); hydrogenated castor oil derivatives; glycerin alkyl ethers; PEG-10 polydimethylsiloxane, glyceryl stearate, etc.).

[0073] 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, etc.) POE-monoleates such as POE-glycerin monoisostearate, POE-glycerin triisostearate, etc.); POE-fatty acid esters (e.g., POE-distearate, POE-monodiolate, 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 type (e.g., Pluronic (Registered 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) (e.g., POE-hydrogenated castor oil monopyloglutamic 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;Examples of natural water-soluble polymers include Oleth-10, PEG-100 stearate, methoxyPEG / PPG-25 / 4 polydimethylsiloxane, polysorbate-60, PEG-40 stearate, and sucrose stearate. Examples of natural water-soluble polymers include plant-derived polymers (e.g., gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed, algae colloid (cassia extract), starch (rice, corn, potato, wheat), glycyrrhizic acid); microbial polymers (e.g., xanthan gum, dextran, succinoglucan, pullulan, etc.); and animal-derived polymers (e.g., collagen, casein, albumin, gelatin, etc.).

[0074] Examples of semi-synthetic water-soluble polymers include starch-based polymers (e.g., carboxymethyl starch, methylhydroxypropyl starch, etc.); cellulose-based polymers (methylcellulose, ethylcellulose, methylhydroxypropylcellulose, hydroxyethylcellulose, sodium cellulose sulfate, hydroxypropylcellulose, carboxymethylcellulose, sodium carboxymethylcellulose, crystalline cellulose, cellulose powder, etc.); and alginate-based polymers (e.g., sodium alginate, propylene glycol alginate ester, etc.).

[0075] Examples of thickening agents include polyacrylic acid-based thickeners such as (acrylic acid (ester)) / C10-30 alkanol acrylic acid ester crosslinked polymer, sodium acrylate / acryloyldimethyl taurate sodium copolymer, acrylic acid ester / cetylethoxy(20) itaconic acid ester copolymer, acrylate / cetylethoxy(20) methacrylate copolymer, acrylate / myristylethoxy(25) acrylate copolymer, acrylate / stearylethoxyitaconic acid(20) copolymer, acrylate / stearylethoxy(20) methacrylate copolymer, acrylate / stearylethoxy(50) acrylate copolymer, acrylate / VA crosslinked polymer, PAA (polyacrylic acid), sodium acrylate / vinyl isodecanoate ester crosslinked polymer, Carbomer (polyacrylic acid) and its sodium salts.

[0076] Examples of preservatives include aromatic alcohol-based preservatives such as phenoxyethanol and benzyl alcohol.

[0077] Examples of UV absorbers include benzoic acid-based UV absorbers (e.g., para-aminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerol 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, etc.); anthranilic acid-based UV absorbers (e.g., homomenthyl-N-acetylanthranilate, etc.); and salicylic acid-based UV absorbers (e.g., amyl salicylate). , menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanolphenyl salicylate, etc.); cinnamic acid-based UV absorbers (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-methyl Toxicinname, octyl-p-methoxycinnamate (2-ethylhexyl-p-methoxycinnamate), 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl-diparamethoxycinnamate, etc.); benzophenone-based UV absorbers (e.g., 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone) Phenone, 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'-phenylbenzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone, etc.Examples include 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); dibenzarazine; dianisioylmethane; 4-methoxy-4'-t-butyldibenzoylmethane; 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, dimorpholinopyridazino; 2-ethylhexyl-2-cyano-3,3-diphenylacrylate; 2,4-bis-{[4-(2-ethylhexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-(1,3,5)-triazine, etc.

[0078] Examples of metal ion chelating agents include 1-hydroxyethane-1,1-diphosphonic acid, tetrasodium 1-hydroxyethane-1,1-diphosphonic acid, disodium edetate (EDTA-2Na), trisodium edetate (EDTA-3Na), tetrasodium edetate, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetate, and trisodium ethylenediaminehydroxyethyl triacetate.

[0079] Examples of amino acids include neutral amino acids (e.g., threonine, cysteine, etc.) and basic amino acids (e.g., hydroxylysine, etc.). Examples of amino acid derivatives include sodium acyl sarcosinate (sodium lauroyl sarcosinate), acyl glutamate, sodium acyl β-alanine, glutathione, and pyrrolidone carboxylic acid.

[0080] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0081] Examples of polymer emulsions include acrylic resin emulsion, ethyl polyacrylate emulsion, acrylic resin liquid, polyacrylic alkyl ester emulsion, polyvinyl acetate resin emulsion, and natural rubber latex.

[0082] Examples of pH adjusting agents include buffering agents such as lactate-sodium lactate, citrate-sodium citrate, and succinate-sodium succinate.

[0083] Examples of neutralizing agents include potassium hydroxide, sodium hydroxide, and aminomethylpropanol.

[0084] Examples of vitamins include vitamins A, B1, B2, B6, C, E and their derivatives, pantothenic acid and its derivatives, and biotin.

[0085] Examples of antioxidants include tocopherols, dibutylhydroxytoluene, butylhydroxyanisole, and gallic acid esters.

[0086] Examples of antioxidants include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, kephalin, hexametaphosphorate, phytic acid, and ethylenediaminetetraacetic acid.

[0087] [Uses to achieve firmness]

[0088] The most remarkable effect of the oil-in-water emulsion composition of the present invention is that, when added to an oil-in-water emulsion cosmetic, it enables the cosmetic to impart a firming sensation to the skin while simultaneously ensuring the stability and refreshing feel of the cosmetic. Here, the firming sensation preferably refers to an immediate firming sensation, that is, a clearly noticeable firming sensation in the skin immediately after applying the oil-in-water emulsion cosmetic of the present invention. Therefore, when manufacturing an oil-in-water emulsion cosmetic that is required to impart a firming sensation to the skin, adding the oil-in-water emulsion composition of the present invention thereto results in a cosmetic with a firming effect. [Examples]

[0089] Examples

[0090] The present invention will be described in more detail below through examples and comparative examples, but the present invention is not limited to these examples.

[0091] Before describing specific embodiments, the manufacturing method and evaluation method will be explained below.

[0092] [Manufacturing method]

[0093] 1) Place each component belonging to the aqueous phase into the aqueous phase pot (add after melting if necessary), keep the aqueous phase pot at room temperature, and stir with a stirring paddle to ensure that the solid components are completely dissolved and a uniform aqueous phase mixture is formed.

[0094] 2) Each component belonging to the oil phase is placed in an oil phase pot and heated to 85-90°C to ensure that the solid components are completely melted, forming a uniformly dispersed oil phase mixture.

[0095] 3) Using a homogenizer, the uniformly dispersed oil phase mixture after heating is added to the uniform aqueous phase mixture, and homogenized at a constant rotation speed. Once homogenization is complete, the mixture is discharged.

[0096] 4) If the product requires neutralization with a neutralizing agent, dissolve the neutralizing agent at room temperature to prepare an aqueous solution, add it in step 3), homogenize it with the aqueous and oil phases, and then discharge it.

[0097] According to the above preparation method and the dosages of each component in the table below, oil-in-water emulsions and eye creams were prepared as examples and comparative examples.

[0098] [Evaluation Method]

[0099] <Evaluation of firmness>

[0100] In the test, a control sample (Placebo, whose formulation lacked the film-forming agent and solid humectant of the present invention) and test samples were prepared, including oil-in-water emulsions and eye creams prepared in the examples and comparative examples.

[0101] Each test sample will be tested by 10 subjects.

[0102] The testing procedure is as follows:

[0103] (1) Have the subjects wash their face with facial cleanser (if they are wearing makeup, they should cleanse with cleansing milk / cream before washing their face).

[0104] (2) Take the same amount of sample from the subject's right hand and left hand (one is the control sample and the other is the test sample, and the subject will be asked to perform a blind test).

[0105] (3) The subjects are instructed to apply the samples from their right and left hands simultaneously to the corresponding side of their face, and to be careful not to mix the two samples (Note: the eye cream is applied around the eyes), and to feel the firmness of the skin during the application process until absorption is complete.

[0106] (4) The subjects are asked the following question: "If you were to rate the right side of your face as 0, what score would you give to the firmness of the skin on the left side of your face?"

[0107] -2: The left side of the face is clearly weaker than the right side;

[0108] -1: Upon comparison, it appears that the left side of the face is weaker than the right side;

[0109] 0: The left and right sides of the face are at the same level;

[0110] 1: Upon comparison, it appears that the left side of the face is stronger than the right side;

[0111] 2: The left side of the face is clearly stronger than the right side;

[0112] (5) Criteria for judgment: Out of 10 subjects:

[0113] If less than 50% of the subjects (excluding the control sample) felt firmness from the test sample (resulting in a positive score), it is judged as "×".

[0114] If 50% of the subjects felt a greater firmness in the test sample compared to the control sample (resulting in a positive score), it is judged as △.

[0115] A score of "○" is given if 50% or more of the subjects felt a sense of firmness (positive score) with the test sample compared to the control sample.

[0116] The test results are listed together in a table.

[0117] [Stability Assessment]

[0118] The emulsions and creams of each example and comparative example, prepared according to the method described above, were stored under temperature conditions of 0°C, room temperature, 37°C, and 50°C, respectively, and their stability was judged after 4 weeks according to the following criteria.

[0119] ○: No abnormalities such as separation or changes in appearance were observed after storage.

[0120] △: Minor separation or oil analysis was observed, but it can be restored to its original state by shaking.

[0121] ×: Separation, stratification, or oil analysis is confirmed, and it cannot be restored by shaking.

[0122] [Table 1]

[0123] [Table 2]

[0124] [Table 3]

[0125] [Table 4]

[0126] As can be seen from the evaluation results of the examples and comparative examples shown in Tables 1 to 4 above, adding a fixed amount of hydrogenated polyisobutene alone to an oil-in-water emulsion cosmetic, or adding the solid humectant described in the present invention alone (Table 1), does not yield a cosmetic that possesses both firmness and stability. Only when hydrogenated polyisobutene and a specific solid humectant are added simultaneously in a specific ratio (Tables 2 to 4) can an oil-in-water emulsion cosmetic that possesses both firmness and stability be obtained.

[0127] Industrial applicability

[0128] The oil-in-water emulsion composition according to the present invention simultaneously contains (a) hydrogenated polyisobutene as a film-forming agent and (b) a humectant with a molecular weight of 500 to 4000 that is solid at 25°C, and the mass ratio of component (a) to component (b) is in the range of 1.4:1 to 1:30. When applied to an oil-in-water emulsion cosmetic, the resulting oil-in-water emulsion cosmetic can be made to possess both firmness and good stability.

Claims

1. A composition for oil-in-water emulsion systems, Component (a) Hydrogenated polyisobutene as a film-forming agent, Component (b) comprises a humectant with a molecular weight of 500 to 4000 that is solid at 25°C, A composition for an oil-in-water emulsion system, characterized in that the mass ratio of component (a) to component (b) is in the range of 1.4:1 to 1:

30.

2. The oil-in-water emulsion composition according to claim 1, characterized in that the mass ratio of component (a) to component (b) is in the range of 1:2.5 to 1:

10.

3. Oil-in-water emulsion cosmetic composition, An oil-in-water emulsion cosmetic composition characterized by containing the oil-in-water emulsion composition described in any one of claims 1 or 2.

4. The oil-in-water emulsion cosmetic composition according to claim 3, characterized in that the content of component (a) in the cosmetic composition is 0.1% by mass to 0.7% by mass.

5. The oil-in-water emulsion cosmetic composition according to claim 3, characterized in that the content of component (b) in the cosmetic composition is 0.5% by mass to 3% by mass.

6. The use of the oil-in-water emulsion composition according to claim 1 in the production of an oil-in-water emulsion cosmetic that combines a smooth feel, firmness, and stability.