Cosmetic and method for evaluating cosmetic film

Abstract

To provide a cosmetic film giving a feeling of transparency. And a method for evaluating the transparency of the cosmetic film.SOLUTION: The cosmetic film is formed of an emulsifier type cosmetic containing cellulose nanofibers, an oil agent and a surfactant. The transparency of the cosmetic film is evaluated using the uniformity of the texture, the uniformity of the tint, and the denseness of the irregularities as indices.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cosmetic that can form a cosmetic film that provides a sense of transparency, and also to a method for evaluating the transparency of the cosmetic film. [Background technology]

[0002] In recent years, consumers have shown a preference for translucent skin when it comes to cosmetics. Base makeup is required not only to even out skin tone and conceal skin imperfections such as blemishes and freckles, but also to achieve a translucent, natural finish. Various improvements to the ingredients, such as powders, to be included in cosmetics have been investigated. For example, based on the fact that a high amount of internally reflected light in skin enhances translucency, it has been proposed to create a translucent finish by incorporating layered powders with an adjusted refractive index of the coating component into cosmetics (Patent Document 1). It has also been reported that translucency can be achieved in makeup cosmetics by setting the color and contrast ratio within specific ranges (Patent Document 2). There is also a high demand for skin care cosmetics that achieve translucent skin.

[0003] Recently, cellulose nanofibers (CNFs) have been attracting attention as a component to be incorporated into cosmetics, and for example, Patent Document 3 discloses a transparent gel-like cosmetic preparation containing CNFs and a diol.

[0004] There is also a great deal of interest in assessing desirable skin conditions, and for example, Patent Document 4 discloses a method for assessing radiant skin. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-90443 [Patent Document 2] Japanese Patent Application Publication No. 2023-43656 [Patent Document 3] Patent Publication No. 2021-134212 [Patent Document 4] Japanese Patent Publication No. 2020-73933 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a cosmetic film having a transparent appearance, and also to provide a method for evaluating the transparency of a cosmetic film. [Means for solving the problem]

[0007] The present inventors have studied skin with a translucent appearance, and have noticed that the film formed when mending tape is applied creates an ideal translucent appearance, and have decided to aim for a cosmetic that forms such a cosmetic film. As a result of intensive research, they have found that when the film surface has a moderate amount of fine irregularities, like mending tape, a translucent appearance can be felt, while when there are no irregularities, a glossy appearance can be felt. They have created a composition that can form such a cosmetic film, and have completed the cosmetic of the present invention. Furthermore, while conventionally skin transparency has been evaluated in vivo by sensory evaluation of actual skin, the inventors came up with the idea of ​​establishing standards for the desired skin transparency using indicators of uniformity of texture, uniformity of color, and fineness of unevenness, and of conducting such evaluations in vitro on a skin model, thereby completing the evaluation method of the present invention.

[0008] That is, the present invention is as follows. [1] An emulsion-type cosmetic containing cellulose nanofiber, an oil, and a surfactant. [2] The cosmetic according to [1], wherein the oil agent contains silicone oil. [3] An emulsion-type cosmetic containing cellulose nanofibers, A cosmetic film formed by the cosmetic satisfies the following (a), (b), and (c): (a) Texture uniformity score is 0.2 to 1 (b) Color unevenness score is 5 to 7.5 (c) SDR value is 0.5 or more. [4] The cosmetic according to any one of [1] to [3], wherein the content of cellulose nanofibers in the cosmetic is 0.1% by weight or more of the total cosmetic. [5] The cosmetic preparation according to any one of [1] to [4], which is an oil-in-water emulsion type. [6] A method for evaluating the transparency of a cosmetic film using the uniformity of texture, uniformity of color, and density of unevenness as indicators. [7] The evaluation method described in [6], wherein the cosmetic film is formed in vitro. [8] The evaluation method according to [6] or [7], wherein a cosmetic film is evaluated as having good transparency when the cosmetic film satisfies the following (a), (b), and (c): (a) Texture uniformity score is 0.2 to 1 (b) Color unevenness score is 5 to 7.5 (c) SDR value is 0.5 or more. [Effects of the Invention]

[0009] The present invention provides a cosmetic that can form a cosmetic film that provides an ideal transparency similar to that of mending tape. The present invention also provides an index and method for accurately evaluating the transparency of a cosmetic film. [Brief explanation of the drawings]

[0010] [Figure 1] A 3D image taken with a Keyence Corporation VK-X3000 laser microscope shows the surface shape of a cosmetic film. [Figure 2] FIG. 10 is a diagram showing an image analysis method for setting a color unevenness score and a uniformity score corresponding to a desired transparency. [Figure 3] FIG. 1 shows a method for measuring and analyzing color unevenness scores. [Figure 4] A diagram showing the method for measuring and analyzing uniformity scores. DETAILED DESCRIPTION OF THE INVENTION

[0011] <Cosmetic of the present invention> The mending tape film surface that the inventors focused on has a moderate amount of fine irregularities on the film surface, which has been confirmed to create uniformity in the texture of the cosmetic film and reduce color unevenness, as will be shown in the examples below. Therefore, the cosmetic of the present invention is capable of forming a cosmetic film with fine irregularities similar to the film surface of the mending tape, and such a cosmetic film satisfies the specified parameters. Specifically, the cosmetic film formed by the cosmetic preparation satisfies the following (a), (b), and (c). The cosmetic film is not particularly limited as long as it is formed to a uniform thickness, and may be, for example, formed by forming a film to a thickness of 5 mil on a hydrophilic surface slide glass using a doctor blade and drying it at 40°C for one day. Here, the skin model with pores can be a commercially available skin model, such as "Bio Skin Plate, Pore Model No. 10A (40s) Biocolor (manufactured by Beaulux Co., Ltd.)." (a) Texture uniformity score is 0.2 to 1 (b) Color unevenness score is 5 to 7.5 (c) SDR value is 0.5 or more, preferably 2 or more. It should be noted that the numerical ranges in this specification include the numerical values ​​before and after "to".

[0012] (a) The texture uniformity score is a score that represents the degree of luminance variation within a certain range of the cosmetic film. Specifically, the luminance of the cosmetic film or its image is measured over the range of an arbitrary straight line of the cosmetic film, and the R of the quadratic approximation line when the measured values ​​are plotted against the measurement line is calculated. 2 The length of the line to be measured is not particularly limited, but may be in the range of 10 to 100 mm, for example, the diameter of the skin model on which the cosmetic film is formed may be in the range of 55 mm. 2 The average value of the coefficients may be used as the score. Such measurements and analyses can be performed by analyzing the plot profile using the image analysis software ImageJ.

[0013] (b) The color unevenness score is a score that indicates the degree of color unevenness in a certain area of ​​the cosmetic film. Specifically, the brightness of the cosmetic film or its image may be measured over an arbitrary area range of the cosmetic film, and the brightness variation may be calculated when the number of pixels for each brightness (gray value) is counted. The size of the area to be measured is not particularly limited, but is preferably 100 to 10,000 mm. 2 For example, the area of ​​the skin model on which the cosmetic film is formed (2375 mm in the case of a diameter of 55 mm) 2 ) range. Alternatively, multiple measurement ranges may be set, and the average value of the variations among them may be used as the score. Such measurements and analysis can be performed by analyzing the plot profile using the image analysis software ImageJ.

[0014] (c) The SDR value is one of the indices that express surface roughness. It may be a measurement value in a predetermined range when observing a cosmetic film with a laser microscope, and can be measured using an LSM manufactured by Shimadzu Corporation or an LSM manufactured by Keyence Corporation, and calculated using any analysis software. The measurement range is not particularly limited, but is preferably 1 to 100 mm. 2 For example, it may be a square range of 3 mm x 3 mm, or a plurality of measurement ranges may be provided and the average value of the variations therein may be used.

[0015] In a first aspect of the present invention, the cosmetic film formed by the cosmetic satisfies these parameters, and the cosmetic is an emulsion-type cosmetic containing cellulose nanofibers. The emulsion type is preferably an oil-in-water type, but is not particularly limited thereto. Cellulose nanofiber refers to crystalline cellulose in a fibrous form. The fiber thickness of the cellulose nanofibers is not particularly limited, but may be that which is typically incorporated into cosmetics, and may have, for example, a number average fiber diameter of preferably 2 to 500 nm, more preferably 2 to 150 nm.Furthermore, the aspect ratio of the cellulose nanofibers is not particularly limited, but may be that which is typically incorporated into cosmetics, and may be, for example, preferably 50 or more, more preferably 100 or more. As the cellulose nanofiber, commercially available products can be used, such as "Leocrysta C-2SP" (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) and "Cellenpia" (manufactured by Nippon Paper Group Co., Ltd.).

[0016] The content of cellulose nanofibers in the cosmetic is not particularly limited, but may be, for example, 0.1 wt % or more, 0.25 wt % or more, or 0.5 wt % or more of the total composition, or 10 wt % or less, 5 wt % or less, or 2.5 wt % or less, or any compatible combination thereof. By using the composition in this range, a cosmetic film with a moderate amount of unevenness is formed, resulting in skin with a translucent appearance.

[0017] A second aspect of the present invention is an emulsion-type cosmetic containing cellulose nanofibers, an oil, and a surfactant. The emulsion-type is preferably an oil-in-water type, but is not particularly limited thereto. When an emulsion-type cosmetic contains cellulose nanofibers, an oil, and a surfactant, the cosmetic film formed by the cosmetic satisfies the above parameters. In other words, by using cellulose nanofibers in combination with an oil and a surfactant, the cellulose nanofibers can be appropriately The fiber disperses in the emulsion system, forming a cosmetic film with a moderate amount of unevenness. The cellulose nanofibers are as described above.

[0018] Examples of oil agents include silicone oil, polar oil, natural oil, and hydrocarbon oil, and silicone oil is particularly preferred. The content of the oil in the cosmetic is preferably 0.1 to 70% by weight, more preferably 0.5 to 40% by weight, and even more preferably 1 to 20% by weight, and is not particularly limited.

[0019] Silicone oils include dimethylpolysiloxane (dimethicone), cyclopentasiloxane, decamethylcyclopentasiloxane, caprylyl methicone, trimethylsiloxysilicate, (dimethicone / vinyl dimethicone) crosspolymer, (dimethicone / phenyl vinyl dimethicone) crosspolymer, and the like.

[0020] Polar oils include cetyl ethylhexanoate, octyldodecyl stearoyloxystearate, triisostearin, polyglyceryl-2 triisostearate, triethylhexanoin, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, and isocetyl stearate. ethanol, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexylate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glyceryl di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexylate, trimethylolpropane triisostearate, pentaneerythritol tetra-2-ethylhexylate, Glyceryl 2-ethylhexanoate, trimethylolpropane triisostearate, 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 adipate ester oils such as 2-heptylundecyl, 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, and diethylamino hydroxybenzoyl hexyl benzoate.

[0021] 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.

[0022] Examples of hydrocarbon oils include isododecane, isohexadecane, squalane, hydrogenated poly(C6-12)olefin, and hydrogenated polyisobutene.

[0023] Surfactants include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants. The content of the surfactant in the cosmetic is preferably 0.1 to 20% by weight, more preferably The content is preferably 0.5 to 15% by weight, and more preferably 1 to 10% by weight, but is not particularly limited.

[0024] Examples of anionic surfactants include fatty acid soaps (e.g., sodium laurate, sodium palmitate, etc.); higher alkyl sulfates (e.g., sodium lauryl sulfate, potassium lauryl sulfate, etc.); alkyl ether sulfates (e.g., POE triethanolamine lauryl sulfate, POE sodium lauryl sulfate, etc.); N-acyl sarcosinates (e.g., sodium lauroyl sarcosinate, etc.); higher fatty acid amide sulfonates (e.g., sodium N-myristoyl-N-methyl taurate, sodium coconut oil fatty acid methyl tauride, sodium lauryl methyl tauride, etc.); phosphate 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 polypropylene glycol sulfosuccinate, etc.); sodium carboxylate, etc.); alkylbenzenesulfonates (e.g., sodium linear dodecylbenzenesulfonate, triethanolamine linear dodecylbenzenesulfonate, linear dodecylbenzenesulfonic acid, etc.); higher fatty acid ester sulfate salts (e.g., sodium hydrogenated coconut oil fatty acid glycerin sulfate, etc.); N-acylglutamates (e.g., monosodium N-lauroylglutamate, disodium N-stearoylglutamate, monosodium N-myristoyl-L-glutamate, etc.); sulfated oils (e.g., turmeric oil, etc.); POE alkyl ether carboxylic acids; POE alkyl allyl ether carboxylate salts; α-olefin sulfonates; higher fatty acid ester sulfonates; secondary alcohol sulfate salts; higher fatty acid alkylolamide sulfate salts; sodium lauroylmonoethanolamide succinate; ditriethanolamine N-palmitoyl aspartate; sodium caseinate, etc.

[0025] Examples of cationic surfactants include alkyltrimethylammonium salts (e.g., stearyltrimethylammonium chloride, lauryltrimethylammonium chloride, etc.); alkylpyridinium salts (e.g., cetylpyridinium chloride, etc.); distearyldimethylammonium chloride dialkyldimethylammonium salts; poly(N,N'-dimethyl-3,5-methylenepiperidinium chloride); alkyl quaternary ammonium salts; alkyldimethylbenzylammonium salts; alkylisoquinolinium salts; dialkylmorphonium salts; POE alkylamines; alkylamine salts; polyamine fatty acid derivatives; amyl alcohol fatty acid derivatives; benzalkonium chloride; benzethonium chloride, etc.

[0026] 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, lauryldimethylaminoacetic acid betaine, alkyl betaine, amido betaine, sulfobetaine, etc.).

[0027] Nonionic surfactants include polyether-modified silicones (e.g., polyethylene glycol-10 dimethicone, polyethylene glycol-12 dimethicone, etc.); polyglycerin-modified silicones (e.g., polyglyceryl-3 disiloxane dimethicone, polyglyceryl-3 polydimethylsiloxyethyl dimethicone, etc.); sorbitan fatty acid esters (e.g., sorbitan monooleate, sorbitan monostearate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, diglycerol sorbitan penta-2-ethylhexylate, diglycerol sorbitan tetra-2-ethylhexylate, etc.); glycerin fatty acids (e.g., monoglyceryl cottonseed oil fatty acid , glyceryl monoerucate, glyceryl sesquioleate, glyceryl monostearate, glyceryl α,α'-oleate pyroglutamate, glyceryl (monostearate / malate), etc.); propylene glycol fatty acid esters (e.g., propylene glycol monostearate, etc.); POE castor oil / hydrogenated castor oil derivatives (POE castor oil, POE hydrogenated castor oil, etc.); and non-hydrophilic nonionic surfactants such as glycerin alkyl ether. Also, polyglycerol fatty acid esters (e.g., polyglyceryl monooleate, polyglyceryl monostearate, etc.); POE sorbitan fatty acid esters (e.g., POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan tetraoleate, etc.); POE sorbit fatty acid esters (e.g., POE sorbit monolaurate, POE sorbit monooleate, POE sorbit pentaoleate, POE sorbit monostearate, etc.); POE glycerin fatty acid esters (e.g., POE monooleates such as POE glycerin monostearate, POE glycerin monoisostearate, POE glycerin 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.); POE alkyl phenyl ethers (e.g., POE nonylphenyl ether, etc.); Pluronic types (e.g., Pluronic (registered trademark), 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.);Hydrophilic nonionic surfactants such as 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 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; alkyl glucosides; alkylethoxydimethylamine oxides; and trioleyl phosphate.

[0028] The cosmetic of the present invention may contain any ingredients that are used in the production of ordinary cosmetics, as long as the effects of the present invention are not impaired. Examples of such optional components include alcohols, ethers, powders, moisturizers, sequestering agents, pearlescent agents, amino acids, organic amines, polymer emulsions, pH adjusters, vitamins, antioxidants, preservatives, water-soluble polymers, fragrances, and various active ingredients.

[0029] Examples of alcohols include monohydric alcohols such as cetanol, batyl alcohol, behenyl alcohol, palmitoleic alcohol, heptadecanol, 1-heptadecanol, stearyl alcohol, isostearyl alcohol, elaidyl alcohol, oleyl alcohol, linoleyl alcohol, elaidolinoleyl alcohol, linolenyl alcohol, elaidolinolenyl alcohol, ricinoleyl alcohol, nonadecyl alcohol, arachidyl alcohol, heneicosanol, behenyl alcohol, and erucyl alcohol; ethylene glycol, 1,3-butylene glycol, trimethylene glycol, and 1,2-butylene glycol; Dihydric alcohols such as ethylene glycol, propylene glycol, dipropylene glycol, propanediol, 1,2-pentanediol, 3-methyl-1,3-butanediol, tetramethylene glycol, 2,3-butylene glycol, pentamethylene glycol, 2-butene-1,4-diol, hexylene glycol, and octylene glycol; trihydric alcohols such as trimethylolpropane; tetrahydric alcohols such as pentaerythritol; pentahydric alcohols such as xylitol; polyhydric alcohol polymers such as triglycerin, tetraglycerin, and polyglycerin; sugar alcohols such as starch-decomposed sugar-reduced alcohols; and polyglycerin. alcohol alkyl ethers such as 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, and ethylene glycol isopropyl ether; alcohol alkyl ethers such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl 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, and dipropylene glycol butyl ether; glycerin monoalkyl ethers such as xyl alcohol, selachyl alcohol, and batyl alcohol; Alcohol polymers such as diethylene glycol, triethylene glycol, polypropylene glycol, and tetraethylene glycol; Examples include glycerol; 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.

[0030] Examples of ethers include those corresponding to the above alcohols, as well as ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol methyl ethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monophenyl ether acetate, ethylene glycol diadipate, 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.

[0031] The powder may be spherical, needle-like, plate-like, or any other suitable shape, and examples thereof include inorganic powders (e.g., talc, kaolin, mica, sericite, muscovite, phlogopite, synthetic mica, lepidolite, biotite, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, tungstate metal salts, magnesium, silica, alumina, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluoroapatite, hydroxyapatite, ceramic powder, boron nitride, etc.) etc.); organic powders (e.g., polyamide resin powder (nylon powder), polyethylene powder, poly(methyl meth)acrylate powder, polystyrene powder, styrene and acrylic acid copolymer resin powder, silicone resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder, cellulose powder, etc.); metal soaps (e.g., zinc myristate, calcium palmitate, aluminum stearate); inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., iron oxide (red iron), iron titanate, etc.); inorganic brown pigments (e.g., γ-iron oxide, etc.); inorganic yellow pigments (e.g., Yellow iron oxide, ochre, etc.; inorganic black pigments (e.g., black iron oxide, low-order titanium oxide, etc.); inorganic purple pigments (e.g., mango 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.); zirconium, barium or aluminum organic pigments such as ammonium lakes (e.g., organic pigments such as Red No. 201, 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); natural pigments (e.g., chlorophyll, β-carotene, etc.); and organically modified clay minerals (e.g., organically modified hectorite, etc.).

[0032] Examples of moisturizing agents include chondroitin sulfate, hyaluronic acid, mucoitin sulfate, caronic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, dl-pyrrolidone carboxylate, short-chain soluble collagen, diglycerin (EO)PO adduct, Rosa robur extract, yarrow extract, and melilot extract.

[0033] Examples of sequestering agents include 1-hydroxyethane-1,1-diphosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid tetrasodium salt, edetate disodium, edetate trisodium, edetate tetrasodium, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetic acid, and ethylenediaminehydroxyethyltriacetate trisodium salt.

[0034] Examples of pearlescent agents include glycol distearate and titanium mica.

[0035] 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 sarcosine (sodium lauroyl sarcosine), acyl glutamate, sodium acyl β-alanine, glutathione, pyrrolidone carboxylic acid, etc.

[0036] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0037] Examples of polymer emulsions include acrylic resin emulsion, polyethyl acrylate emulsion, acrylic resin liquid, polyacrylic alkyl ester emulsion, polyvinyl acetate resin emulsion, and natural rubber latex.

[0038] Examples of pH adjusters include buffers such as lactic acid-sodium lactate, citric acid-sodium citrate, and succinic acid-sodium succinate, and are usually used to adjust the pH of the internal phase (aqueous component).

[0039] Vitamins include, for example, vitamins A, B1, B2, B6, C, E and their derivatives. , pantothenic acid and its derivatives, biotin, etc.

[0040] Examples of antioxidants include tocopherols, dibutylhydroxytoluene (BHT), butylhydroxyanisole, pyrosulfite, gallic acid ester, phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, and ethylenediaminetetraacetic acid.

[0041] Examples of preservatives include parabens and phenoxyethanol.

[0042] Examples of water-soluble polymers include natural water-soluble polymers such as plant-derived polymers (e.g., gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed (quince), algae colloid (cassow extract), starch (rice, corn, potato, wheat), glycyrrhizic acid); microbial-derived polymers (e.g., xanthan gum, dextran, succinoglucan, pullulan, etc.); and animal-derived polymers (e.g., collagen, casein, albumin, gelatin, etc.). semi-synthetic water-soluble polymers such as starch-based polymers (e.g., carboxymethyl starch, methylhydroxypropyl starch, etc.); cellulose-based polymers (hydroxypropylmethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, methylcellulose, ethylcellulose, hydroxypropylmethylcellulose stearoxy ether, sodium cellulose sulfate, carboxymethylcellulose, sodium carboxymethylcellulose, crystalline cellulose, cellulose powder, etc.); alginic acid-based polymers (e.g., sodium alginate, propylene glycol alginate, etc.), etc. Examples include synthetic water-soluble polymers such as vinyl polymers (e.g., polyvinyl alcohol, polyvinyl methyl ether, polyvinylpyrrolidone, carboxyvinyl polymer, etc.); polyoxyethylene polymers (e.g., polyethylene glycol 20,000, 40,000, 60,000, etc.); acrylic polymers (e.g., sodium polyacrylate, polyethyl acrylate, polyacrylamide, etc.); polyethyleneimine; and cationic polymers.

[0043] Examples of various active ingredients include anti-inflammatory agents (e.g., salicylic acid derivatives, hinokitiol, zinc oxide, allantoin, etc.); whitening agents (e.g., placenta extract, saxifrage extract, arbutin, etc.); various extracts (e.g., Phellodendron bark, Coptis chinensis, Lithospermum root, Peony, Swertia japonica, Birch, sage, Loquat, Carrot, Aloe, Mallow, Iris, Grape, Job's tears, Luffa, Lily, Saffron, Cnidium rhizome, Angelica acutiloba, St. John's wort, Ononis, Garlic, Capsicum annuum, Tangerine peel, Angelica acutiloba, Seaweed, etc.), activators (e.g., Royal jelly, Photosensitizer, Cholesterol, derivatives, etc.); blood circulation promoters (e.g., nonylic acid valenylamide, 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 (e.g., sulfur, thianthol, etc.); anti-inflammatory agents (e.g., tranexamic acid, thiotaurine, hypotaurine, etc.), etc.

[0044] The cosmetic of the present invention can be in any form, such as a skin care cosmetic, a sunscreen cosmetic, or a makeup cosmetic. Preferred examples of skin care cosmetics include emulsions, essences, and serums. Preferred examples of sunscreen cosmetics include those for the face and body. Preferred examples of makeup cosmetics include makeup bases, foundations, concealers, BB creams, CC creams, mascaras, eye colors, blushes, and eyebrow colors.

[0045] When the cosmetic of the present invention is applied to the skin, it imparts a good transparency. Transparency refers to a state in which the skin appears clear and free of dullness and has no gloss or shine. The transparency of the cosmetic skin makes it possible to achieve a brightened skin tone.

[0046] The cosmetic of the present invention can be produced by a conventional method.

[0047] <Evaluation method of the present invention> The present specification also discloses a method for evaluating the transparency of a cosmetic film. The method for evaluating the transparency of a cosmetic film of the present invention is characterized by using the uniformity of texture, the uniformity of color, and the density of unevenness as indicators. Here, the index of texture uniformity may be determined, for example, in light of the texture uniformity score described above, the color uniformity may be determined, for example, in light of the color unevenness score described above, and the density of unevenness may be determined, for example, in light of the SDR value described above.

[0048] In this method, the cosmetic film may be evaluated on human skin, but it is preferable to perform the evaluation in vitro using a cosmetic film formed on a glass slide or a skin model, as this is simple and provides consistent evaluation results. In this case, if (a), (b), and (c) are satisfied, the cosmetic film may be evaluated as having good transparency. Note that the cosmetic film, (a), (b), and (c) are as described above in <Cosmetic Preparation of the Present Invention>. (a) Texture uniformity score is 0.2 to 1 (b) Color unevenness score is 5 to 7.5 (c) SDR value is 0.5 or more, preferably 2 or more [Example]

[0049] The present invention will be described in more detail below with reference to examples, but the technical scope of the present invention is not limited to the examples illustrated.

[0050] <Preparation of cosmetics> According to the formulation shown in Table 1, an oil-in-water emulsion type cosmetic was prepared.

[0051] <Surface roughness measurement> By comparing films of mending tape (Scotch tape, manufactured by 3M Corporation) and Cellophane Tape (registered trademark) (manufactured by Nichiban Corporation), which are made of the same material, the transparency of the mending tape film was set to be a level that does not have a glaring sheen, disperses light moderately, and is transparent. When the surface of the mending tape was observed with a laser microscope, the presence of fine irregularities was observed. Therefore, the surface roughness (SDR value (%)) of the mending tape was measured, and this value was set as a parameter for the transparency of the cosmetic film to be targeted.

[0052] For each cosmetic product prepared, a film (5 mil) was formed on a hydrophilic surface slide glass using a doctor blade and dried at 40°C for one day to form a cosmetic film. The surface shape of each cosmetic film was observed using a laser microscope (Figure 1). The laser microscopes used were a Keyence Corporation VK-X3000 laser microscope and a Shimadzu Corporation LSM, and the measurement conditions were a 20x objective lens with a range of 3 mm x 3 mm. The SDR value was measured using the built-in analysis software of the instrument.

[0053] <Measurement of color unevenness score> The left and right cheeks of 20 adult women were photographed using a skin measurement device, VISIA-Evolution (registered trademark, Canfield Scientific Inc.). A specific area was cut out from the image and subjected to histogram analysis using the device's analysis program (Figure 2). The StdDev value of the histogram was used as a skin tone unevenness score, and the score for an ideal skin with transparency was searched for and set as the transparency value, with a score of 5 to 7.5.

[0054] Each cosmetic product was applied to a Bio Skin Plate, Pore Model No. 10A (40s), and Bio Color (manufactured by Beaulux Co., Ltd., diameter 55 mm) at a concentration of 0.127 g / cm 2Each cosmetic film was applied evenly with a finger and dried at 40°C for one day to form a cosmetic film. Each cosmetic film was placed on black construction paper and photographed using a skin measurement device, VISIA-Evolution (registered trademark, Canfield Scientific Inc.), with the cosmetic film parallel to the camera. Histogram analysis was performed in the analysis program of the device, and a color unevenness score was calculated (Figure 3). As a reference example, the same score was also measured for mending tape.

[0055] <Measurement of uniformity score> The left and right cheeks of 20 adult women were photographed using a skin measurement device, VISIA-Evolution (registered trademark, Canfield Scientific Inc.). A predetermined area was cut out from the image and a plot profile analysis was performed using the analysis program of the device (Figure 2). The quadratic approximation function of the plot profile, R 2 The value was used as the uniformity score, and the score for an ideal skin image with transparency was searched for and set as the transparency value aiming for a score of 0.2 to 1.

[0056] Each cosmetic product was applied to a Bio Skin Plate, Pore Model No. 10A (40s), and Bio Color (Beaulux Co., Ltd., diameter 55 mm) at a concentration of 0.126 g / cm 2 Each cosmetic film was applied evenly with a finger and dried at 40°C for one day to form a cosmetic film. Each cosmetic film was placed on black construction paper and photographed using a skin measurement device, VISIA-Evolution (registered trademark, Canfield Scientific Inc.), with the cosmetic film parallel to the camera. A plot profile analysis was performed in the device's analysis program, and a uniformity score was calculated (Figure 4). As a reference example, the same score was also measured for mending tape.

[0057] The results of each measurement are shown in Table 1. It was found that cosmetics containing cellulose nanofibers had texture uniformity scores, color unevenness scores, and SDR values ​​close to those of mending tape, making it possible to create an ideal, transparent cosmetic film.

[0058] Table 1

Claims

1. An emulsion-type cosmetic containing cellulose nanofiber, an oil, and a surfactant.

2. The cosmetic preparation according to claim 1 , wherein the oil comprises a silicone oil.

3. An emulsion-type cosmetic containing cellulose nanofibers, A cosmetic film formed by the cosmetic satisfies the following (a), (b), and (c): (a) Texture uniformity score is 0.2 to 1 (b) Color unevenness score: 5 to 7.5 (c) SDR value is 0.5 or more.

4. The cosmetic according to any one of claims 1 to 3, wherein the content of cellulose nanofibers in the cosmetic is 0.1 wt% or more of the total cosmetic.

5. The cosmetic preparation according to any one of claims 1 to 3, which is an oil-in-water emulsion type.

6. A method for evaluating the transparency of a cosmetic film using the uniformity of texture, the uniformity of color, and the density of unevenness as indicators.

7. The evaluation method according to claim 6, wherein the cosmetic film is formed in vitro.

8. The evaluation method according to claim 6 or 7, wherein the cosmetic film is evaluated as having good transparency when the cosmetic film satisfies the following (a), (b), and (c): (a) Texture uniformity score is 0.2 to 1 (b) Color unevenness score: 5 to 7.5 (c) SDR value is 0.5 or more.

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