cosmetic

Abstract

To provide a technique for incorporating a component unstable to water into a stable oil-in-water emulsion type cosmetic while suppressing its decomposition and deterioration.SOLUTION: The oil-in-water emulsion type cosmetic is prepared by mixing a first composition containing an oil agent, an oil-based thickener and a component unstable to water and a second composition containing water, a surfactant of HLB5-15 and a thickener at the time of use.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water emulsion type cosmetic preparation that is prepared by mixing at the time of use. [Background technology]

[0002] Cosmetics contain a variety of active ingredients, such as whitening agents, anti-wrinkle agents, anti-aging agents, etc. Some of these ingredients have low stability in water, so technologies have been proposed to stably incorporate these ingredients into cosmetics by suppressing their deterioration and decomposition. For example, it has been proposed to use an oil-based formulation, and Patent Document 1 discloses that the use of a specific oil suppresses the decomposition of ingredients that are unstable in water. Furthermore, from the perspective of improving the feel of cosmetics when used and expanding the range of formulation options, there is a demand for incorporating water-unstable ingredients into formulations that contain a lot of water or have good fluidity. Patent Document 2 discloses a cosmetic that is prepared just before use, which is stored separately into two compositions: an oily composition containing water-unstable ingredients, and a lotion-like composition containing a water-soluble physiologically active substance and a thickener, and the two compositions are mixed by stirring at the time of use. However, such a cosmetic is a mixture of two compositions, and does not necessarily provide a satisfactory feel when used. Emulsifiers are one example of formulations that provide an excellent feel when used, and a cosmetic product has also been disclosed in which an oil-based composition and an aqueous composition are mixed at the time of use to prepare an oil-in-water emulsion composition (Patent Document 3). However, it is difficult to obtain a stable emulsion during preparation and over time when emulsifying by stirring and mixing by hand. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 098010 [Patent Document 2] Patent No. 4417857 [Patent Document 3] Patent No. 6735268 Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above circumstances, an object of the present invention is to provide a technique for incorporating water-unstable components into a stable oil-in-water emulsion-type cosmetic while suppressing the decomposition and deterioration of the components. [Means for solving the problem]

[0005] As a result of extensive research, the present inventors have come up with the idea of ​​incorporating a water-unstable component together with an oil and an oil-based thickener into the oil phase component composition, and incorporating a predetermined surfactant and thickener into the aqueous phase component composition, and mixing the two compositions to form an oil-in-water emulsion-type composition that is prepared just before use, thereby completing the present invention.

[0006] That is, the present invention is as follows. [1] An oil-in-water emulsion-type cosmetic preparation that is prepared at the time of use by mixing a first composition containing an oil, an oil-based thickener, and a component that is unstable in water with a second composition containing water, a surfactant with an HLB value of 5 to 15, and a thickener. [2] The cosmetic preparation according to [1], wherein the mixing ratio of the first composition to the second composition is 1:99 to 5:5 (weight ratio). [3] The cosmetic preparation according to [1] or [2], wherein the first composition is substantially free of surfactants. [4] The cosmetic according to any one of [1] to [3], wherein the oil-based thickener is contained in an amount of 0.1 to 0.5% by weight of the entire cosmetic. [5] The cosmetic according to any one of [1] to [4], wherein the thickener is contained in an amount of 0.1 to 0.5% by weight of the entire cosmetic. [6] The cosmetic according to any one of [1] to [5], wherein the surfactant having an HLB value of 5 to 15 is contained in an amount of 0.5 to 5.0% by weight of the entire cosmetic. [7] The cosmetic preparation according to any one of [1] to [6], wherein the surfactant having an HLB of 5 to 15 includes polyglyceryl-3 methylglucose distearate. [8] The cosmetic preparation according to any one of [1] to [7], which has a pH of 3 to 8. [9] The cosmetic preparation according to any one of [1] to [8], which has a viscosity at 25°C of 500 to 20,000 mPa·s.

[10] A first composition containing an oil agent, an oil-based thickener, and a component unstable to water; and a second composition containing water, a surfactant with an HLB value of 5 to 15, and a thickener. [Effects of the Invention]

[0007] According to the present invention, since the cosmetic is prepared just before use, it is possible to prevent contact with water during distribution and storage before use, thereby maintaining the stability of ingredients that are unstable to water. Furthermore, even if the cosmetic is prepared just before use by a consumer or the like, it can easily prepare a cosmetic that is well emulsified at the time of use without using specialized equipment. Furthermore, even when the cosmetic is stored after preparation, it can maintain a stable emulsion form for a while without requiring further mixing. DETAILED DESCRIPTION OF THE INVENTION

[0008] The present invention will be described in detail below. In this specification, when a numerical range is expressed as "A to B," it means A or more and B or less, that is, it indicates a numerical range that includes A and B.

[0009] The cosmetic of the present invention is obtained by preparing the first composition and the second composition just before use.

[0010] The first composition contains an oil, an oil-based thickener, and a water-unstable component, and constitutes the oil phase of the oil-in-water emulsion composition. The first composition can be produced by appropriately mixing these components, and can be produced by mixing and dispersing all the components uniformly, regardless of the mixing order.

[0011] Examples of oil agents include, but are not limited to, silicone oil, polar oil, natural oil, and hydrocarbon.

[0012] Silicone oils include dimethylpolysiloxane (dimethicone), cyclopentasiloxane, decamethylcyclopentasiloxane, caprylyl methicone, trimethylsiloxysilicate, (dimethicone / vinyl dimethicone) crosspolymer, (dimethicone / phenyl vinyl dimethicone) crosspolymer, and the like.

[0013] Polar oils include synthetic ester oils such as 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-ethylhexylate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glyceryl di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexylate, trimethylolpropane triisostearate, pentaneerythritol tetra-2-ethylhexylate, glyceryl tri-2-ethylhexanoate, trime triisostearate, Tyrolpropane, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleic acid oil, cetostearyl alcohol, acetoglyceride, 2-heptylundecyl palmitate, 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, isononyl isononanoate, ethyl acetate, butyl acetate, amyl acetate, triethyl citrate, octyl methoxycinnamate, 2-ethylhexyl paramethoxycinnamate, diethylamino hydroxybenzoyl hexyl benzoate, and the like.

[0014] Examples of natural oils include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, camellia oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, Japanese kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, sunflower oil, triglycerin, glyceryl trioctanoate, and glyceryl triisopalmitate.

[0015] Examples of hydrocarbon oils include isododecane, isohexadecane, squalane, hydrogenated poly(C6-12)olefin, and hydrogenated polyisobutene.

[0016] The content of the oil in the cosmetic of the present invention is preferably 1.0 to 10% by weight of the total cosmetic, more preferably 2 to 9.8% by weight, even more preferably 4 to 9.6% by weight, and particularly preferably 5 to 9.5% by weight. Furthermore, the content of the oil in the first composition in the cosmetic of the present invention may vary depending on the mixing ratio of the first composition and the second composition, but is preferably within the range of the final concentration after mixing, i.e., the content in the entire cosmetic, and is not particularly limited.

[0017] The oil-based thickener is not particularly limited as long as it is compatible with the oil agent. For example, esters of polysaccharides and fatty acids are included, specifically dextrin palmitate, dextrin palmitate / ethylhexanoate, dextrin myristate, inulin stearate, etc. Also included are crosspolymers of polyoxyalkylene and silicone, specifically PEG-15 / lauryl dimethicone crosspolymer, PEG-15 / lauryl polydimethylsiloxyethyl dimethicone crosspolymer, dimethicone / PEG-10 / 15 crosspolymer, etc. Also included are hydrocarbon polymers and copolymers, specifically ethylene / propylene copolymer, butylene / ethylene / styrene copolymer, ethylene / propylene / styrene copolymer, hydrogenated styrene / isoprene copolymer, hydrogenated polyisobutene, etc. Clay minerals treated with quaternary ammonium salts are also included, specifically dimethyl distearyl ammonium hectorite, dimethyl distearyl ammonium bentonite, disteardimonium hectorite, stearalkonium bentonite, stearalkonium hectorite, benzyl dimethyl stearyl ammonium hectorite, distearyl dimethyl ammonium chloride-treated hectorite, distearyl dimethyl ammonium chloride-treated bentonite, quaternium-18 hectorite, quaternium-18 bentonite, quaternium-90 bentonite, etc. Waxes are also included, specifically synthetic waxes, synthetic hydrocarbon waxes, microcrystalline waxes, paraffin, heavy liquid isoparaffin, polyethylene wax, etc. Glutamide derivatives are also included. Lipids are also included, and specific examples include dibutyl ethylhexanoyl glutamide, dibutyl lauroyl glutamide, and the like.

[0018] The content of the oil-based thickener in the cosmetic of the present invention is preferably 0.1 to 0.5 wt %, more preferably 0.15 to 0.45 wt %, even more preferably 0.2 to 0.4 wt %, and particularly preferably 0.25 to 0.3 wt % of the total cosmetic. Furthermore, the content of the oil-based thickener in the first composition in the cosmetic of the present invention may vary depending on the mixing ratio of the first composition and the second composition, but is preferably within the range of the final concentration after mixing, i.e., the content in the entire cosmetic, and is not particularly limited. In this specification, the term "water-unstable component" refers to a component that decomposes, deteriorates, or denatures upon contact with water. For example, it may include, but is not limited to, a component that, when contacted with water at 40°C, retains 95% or less of its original content after 1 hour.

[0019] Examples of the water-unstable component include a compound represented by the following general formula (1), an isomer thereof, and / or a pharmacologically acceptable salt thereof. [ka]

[0020] In general formula (1), R1 represents a linear or branched alkyl group having 1 to 4 carbon atoms substituted with a carboxyl group, or a linear or branched alkyl group having 1 to 4 carbon atoms substituted with a carboxylic acid ester group having an alkyl chain having 1 to 4 carbon atoms, and R2 and R3 each independently represent a linear or branched alkyl group having 1 to 4 carbon atoms. The compound represented by the general formula (1) is an optically active compound having multiple asymmetric carbon atoms in its molecular structure, and therefore exists as an enantiomer and a diastereomer. Furthermore, the compound represented by the general formula (1) of the present invention exists as a racemate, an enantiomer, a diastereomer, and a mixture of the isomers in any ratio.

[0021] The compound represented by the general formula (1) is preferably a compound represented by the following general formula (2). [ka]

[0022] In the general formula (2) of the present invention, R4 represents a linear or branched alkyl group having 1 to 4 carbon atoms substituted with a carboxyl group, and R5 and R6 each independently represent a linear or branched alkyl group having 1 to 4 carbon atoms. R4 represents a linear or branched alkyl group having 1 to 4 carbon atoms substituted with a carboxyl group.

[0023] Among the compounds represented by the general formula (2), 3-[[4-(carboxymethylaminocarbonyl)phenylcarbonyl]-valyl-prolyl]amino-1,1,1-trifluoro-4-methyl-2-oxopentane is more preferred, and 3(RS)-[[4-(carboxymethylaminocarbonyl)phenylcarbonyl]-L-valyl-L-prolyl]amino-1,1,1-trifluoro-4-methyl-2-oxopentane represented by the following formula (3) is even more preferred. This compound is also referred to as N-[4-[[(carboxymethyl)amino]carbonyl]benzoyl]-L-valyl-N-[(RS)-3,3,3-trifluoro-1-(1-methylethyl)-2-oxopropyl]-L-prolinamide in another nomenclature.

[0024] [ka]

[0025] The compound represented by the general formula (1) can be directly contained in the composition, or can be converted into a salt form by treating with a pharmacologically acceptable acid or base and used as a salt. Examples of the salt include inorganic acid salts such as hydrochloride, sulfate, nitrate, phosphate, and carbonate; organic acid salts such as maleate, fumarate, oxalate, citrate, lactate, tartrate, methanesulfonate, paratoluenesulfonate, and benzenesulfonate; alkali metal salts such as sodium salt and potassium salt, alkaline earth metal salts such as calcium salt and magnesium salt; organic amine salts such as triethylamine salt, triethanolamine salt, ammonium salt, monoethanolamine salt, and piperidine salt; and basic amino acid salts such as lysine salt and arginine salt.

[0026] Examples of water-unstable components include oil-soluble vitamins, such as vitamin A or derivatives thereof, such as retinol, retinol acetate, and retinol palmitate, vitamin E or derivatives thereof, such as α-tocopherol, γ-tocopherol, δ-tocopherol, tocopherol nicotinate, and tocopherol acetate, and oil-soluble vitamin C derivatives, such as ascorbyl palmitate, ascorbyl stearate, and ascorbyl tetraisostearate.

[0027] The content of the water-unstable component in the cosmetic of the present invention is preferably 0.01 to 1 wt %, more preferably 0.05 to 0.8 wt %, even more preferably 0.1 to 0.6 wt %, and particularly preferably 0.2 to 0.5 wt % of the total cosmetic. The content of the water-unstable component in the first composition of the cosmetic of the present invention may vary depending on the mixing ratio of the first composition and the second composition, but the final concentration after mixing, i.e. In particular, the content is preferably within the range of the total content of the cosmetic, but is not particularly limited.

[0028] The first composition preferably contains substantially no surfactant and substantially no water, in order to prevent hydrolysis or deterioration of components that are unstable in water. Here, "substantially free" means that the content of the component is preferably 0.1% by weight or less, more preferably 0.01% by weight or less, even more preferably 0.001% by weight or less, and particularly preferably 0.0001% by weight or less of the total composition.

[0029] The second composition contains water, a surfactant with an HLB of 5 to 15, and a thickener. It constitutes the aqueous phase of the oil-in-water emulsion composition. In this specification, the HLB (Hydrophilic-Lypophilic Balance) may be a value calculated using the Griffin method. The second composition can be produced by appropriately mixing these components, and can be produced by mixing and dispersing all the components uniformly, regardless of the order of mixing.

[0030] The surfactant having an HLB of 5 to 15 is not particularly limited to anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, etc., and any of these surfactants having an HLB in the range of 5 to 15 can be used. Although not particularly limited, nonionic surfactants are preferred, glycerin ester surfactants are more preferred, glycerin ester surfactants having glucose as a modifying group are even more preferred, and polyglyceryl-3 methylglucose distearate is particularly preferred.

[0031] The content of the surfactant with an HLB of 5 to 15 in the cosmetic of the present invention is preferably 0.5 to 5.0 wt %, more preferably 1 to 4 wt %, even more preferably 1.5 to 3.5 wt %, and particularly preferably 2 to 3 wt % of the total cosmetic. Furthermore, the content of the surfactant in the second composition in the cosmetic of the present invention may vary depending on the mixing ratio of the first composition and the second composition, but is preferably within the range of the final concentration after mixing, i.e., the content in the entire cosmetic, and is not particularly limited.

[0032] As the thickener, a water-soluble one is usually used, and examples thereof include guar gum, quince seed, carrageenan, galactan, gum arabic, pectin, mannan, starch, xanthan gum, curdlan, methylcellulose, hydroxyethyl cellulose, carboxymethyl cellulose, methylhydroxypropyl cellulose, chondroitin sulfate, dermatan sulfate, glycogen, heparan sulfate, hyaluronic acid, sodium hyaluronate, tragacanth gum, keratan sulfate, chondroitin, mucoitin sulfate, hydroxyethyl guar gum, carboxymethyl guar gum, dextran, keratosulfuric acid, locust bean gum, succinoglucan, caronic acid, chitin, chitosan, carboxymethyl chitin, agar, polyvinyl alcohol, polyvinylpyrrolidone, carboxyvinyl polymer, alkyl-modified carboxyvinyl polymer, sodium polyacrylate, polyethylene glycol, and bentonite.

[0033] The content of the thickener in the cosmetic of the present invention is preferably 0.1 to 0.5 wt %, more preferably 0.15 to 0.45 wt %, even more preferably 0.2 to 0.4 wt %, and particularly preferably 0.25 to 0.35 wt %, of the total cosmetic. Furthermore, the content of the thickener in the second composition in the cosmetic of the present invention may vary depending on the mixing ratio of the first composition and the second composition, but is preferably within the range of the final concentration after mixing, i.e., the content in the entire cosmetic, and is not particularly limited.

[0034] In addition to the above-mentioned components, the composition of the present invention may contain any other components as long as they do not impair the effects of the present invention. Examples of such ingredients include various active ingredients, polyhydric alcohols, powders, UV protection agents, moisturizers, pH adjusters, preservatives, antibacterial agents, antioxidants, antioxidant aids, etc. that are usually blended into cosmetics.

[0035] The active ingredients include whitening ingredients, anti-wrinkle ingredients, anti-inflammatory ingredients, and extracts derived from plants and animals.

[0036] Examples of polyhydric alcohols include polyethylene glycol, glycerin, 1,3-butylene glycol, erythritol, sorbitol, xylitol, maltitol, propylene glycol, dipropylene glycol, diglycerin, isoprene glycol, 1,2-pentanediol, 2,4-hexylene glycol, 1,2-hexanediol, and 1,2-octanediol.

[0037] Examples of powders include powders such as mica, talc, kaolin, synthetic mica, calcium carbonate, magnesium carbonate, anhydrous silicic acid (silica), aluminum oxide, and barium sulfate, which may be surface-treated; inorganic pigments such as red iron oxide, yellow iron oxide, black iron oxide, cobalt oxide, ultramarine, iron blue, titanium oxide, and zinc oxide, which may be surface-treated; pearling agents such as titanium dioxide, fish phosphate foil, and bismuth oxychloride, which may be surface-treated; Examples of organic pigments include Red No. 202, Red No. 228, Red No. 226, Yellow No. 4, Blue No. 404, Yellow No. 5, Red No. 505, Red No. 230, Red No. 223, Orange No. 201, Red No. 213, Yellow No. 204, Yellow No. 203, Blue No. 1, Green No. 201, Purple No. 201, and Red No. 204, which may be coated; and organic powders such as polyethylene powder, polymethyl methacrylate, nylon powder, and organopolysiloxane elastomers.

[0038] Examples of ultraviolet protection agents include ultraviolet absorbers and ultraviolet scattering agents. Examples of ultraviolet absorbers include para-aminobenzoic acid-based ultraviolet absorbers, anthranilic acid-based ultraviolet absorbers, salicylic acid-based ultraviolet absorbers, cinnamic acid-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, sugar-based ultraviolet absorbers, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 4-methoxy-4'-t-butyldibenzoylmethane, and other ultraviolet absorbers. Examples of ultraviolet scattering agents include fine particle metal oxides such as fine particle titanium oxide and fine particle zinc oxide.

[0039] Examples of moisturizing agents include polyethylene glycol, propylene glycol, glycerin, 1,3-butylene glycol, xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucoitin sulfate, caronic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile salts, dl-pyrrolidone carboxylate, short-chain soluble collagen, diglycerin (EO)PO adduct, Rosa robur extract, yarrow extract, melilot extract, and the like. Examples of pH adjusters include buffers such as lactic acid-sodium lactate, citric acid-sodium citrate, and succinic acid-sodium succinate. Preservatives include ethylparaben and butylparaben. Preferred examples of the antibacterial agent include synthetic antibacterial agents such as 1,3-butylene glycol and paraoxybenzoic acid esters, as well as natural antibacterial substances such as caprylyl glycol, glyceryl caprylate, ethylhexylglycerin, and caprylhydroxamic acid. Examples of antioxidants include tocopherols, dibutylhydroxytoluene, butylhydroxyanisole, gallic acid esters, etc. 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.

[0040] The cosmetic of the present invention comprises a first composition and a second composition, and further comprises other compositions. Since the composition is prepared just before use, the water-labile components contained in the first composition are prevented from coming into contact with water during distribution and storage until use, and therefore decomposition or denaturation of the components can be suppressed. When using the cosmetic of the present invention, a uniform oil-in-water emulsion can be achieved by mixing the first composition and the second composition. The mixing ratio of the first composition to the second composition is preferably 1:99 to 5:5 (weight ratio). The first composition and the second composition can be mixed by any method, for example, by adding the first composition to a container containing the second composition and then inverting or shaking the container. The composition of the present invention makes it possible to easily prepare a cosmetic product that is well emulsified at the time of use without using any dedicated equipment. Furthermore, even when stored after preparation, the composition can maintain a stable emulsion form for a while without requiring further mixing.

[0041] The pH of the cosmetic of the present invention obtained by mixing the first composition and the second composition is usually 3 to 8 at 25°C.

[0042] The viscosity of the cosmetic of the present invention obtained by mixing the first composition and the second composition is usually 500 to 20,000 mPa·s at 25° C. The viscosity here is measured using a Brookfield viscometer, specifically, at 25° C. using a Vismetron VDA2 viscometer (manufactured by Shibaura Semtec Co., Ltd.) with a No. 3 rotor at a rotation speed of 6 rpm for 1 minute.

[0043] This specification also discloses a cosmetic kit comprising a first composition and a second composition. The description of each composition applies mutatis mutandis to the description of the cosmetic of the present invention described above. This cosmetic kit is intended to be prepared immediately upon use by mixing the first composition and the second composition at the time of use. The kit may also contain other compositions, and may also include a container or device for mixing the first composition and the second composition. [Example]

[0044] 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 as long as it does not depart from the gist of the invention.

[0045] <Test Example 1> A first composition and a second composition were prepared according to the formulations shown in Tables 1 and 2, respectively. The first composition was then added to the second composition, and the container was repeatedly inverted to thoroughly mix the compositions, thereby preparing an oil-in-water emulsion-type cosmetic. The pH of the prepared cosmetic was in the range of 3 to 8 at 25°C.

[0046] The viscosity of each cosmetic product prepared was measured at 25°C. Viscosity measurements were performed using a Vismetron VDA2 viscometer (Shibaura Semtec Co., Ltd.) with a No. 3 rotor at 6 rpm for 1 minute. The measured values ​​were evaluated using the following three-level scale. The results are shown in Tables 1 and 2. Viscosity reduction: less than 500 mPa·s Suitable: 500~20000mPa·s Viscosity: Over 20,000 mPa·s

[0047] The appearance of each cosmetic preparation was observed immediately after preparation, and emulsifying properties were evaluated using the following three-point scale. The results are shown in Tables 1 and 2. ○: Uniform emulsification △: Slightly uneven emulsion ×: Uneven emulsion or separated state

[0048] The appearance of each prepared cosmetic preparation was observed after one month of storage at 25°C, and the change in the emulsified state was evaluated using the following three-point scale. If a uniform emulsified state was maintained after preparation, it was considered that the stability of ingredients unstable to water was maintained, and this was used to evaluate stability over time. The results are shown in Tables 1 and 2. ○: Uniform emulsification △: Slightly uneven emulsion ×: Uneven emulsion or separated state

[0049] A comprehensive assessment of viscosity, emulsifiability, and stability over time was made, and cases with two or more suitable / ○ were marked with ◎, with one being marked with ○, with 0 being marked with △, and with 0 and × being marked with ×.

[0050] [Table 1]

[0051] [Table 2] [Industrial Applicability]

[0052] According to the present invention, it is possible to stably incorporate water-unstable ingredients into oil-in-water emulsion-type cosmetics that have a pleasant feel when used and are stable over time. Such cosmetics meet consumer demands and are industrially useful.

Claims

1. a first composition containing an oil, an oil-based thickener, and a water-unstable component; a second composition containing water, a surfactant having an HLB of 5 to 15, and a thickener; An oil-in-water emulsion type cosmetic that is prepared by mixing at the time of use.

2. 2. The cosmetic according to claim 1, wherein the mixing ratio of the first composition to the second composition is 1:99 to 5:5 (by weight).

3. The cosmetic preparation according to claim 1, wherein the first composition is substantially free of surfactants.

4. 2. The cosmetic according to claim 1, wherein the oil-based thickener is contained in an amount of 0.1 to 0.5% by weight of the total cosmetic.

5. 2. The cosmetic according to claim 1, wherein the thickener is contained in an amount of 0.1 to 0.5% by weight of the entire cosmetic.

6. 2. The cosmetic according to claim 1, wherein the surfactant having an HLB of 5 to 15 is contained in an amount of 0.5 to 5.0% by weight of the entire cosmetic.

7. 2. The cosmetic preparation according to claim 1, wherein the surfactant having an HLB of 5 to 15 comprises polyglyceryl-3 methylglucose distearate.

8. 2. The cosmetic preparation according to claim 1, which has a pH of 3 to 8.

9. 2. The cosmetic according to claim 1, having a viscosity at 25°C of 500 to 20,000 mPa·s.

10. a first composition containing an oil, an oil-based thickener, and a water-unstable component; and a second composition containing water, a surfactant having an HLB of 5 to 15, and a thickener.

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