Oil-in-water emulsion cosmetics

Abstract

To provide an oil-in-water type emulsion cosmetic that can reduce both a color difference between product appearance color and applied color obtained on skin and a color difference occurred when contacting water.SOLUTION: An oil-in-water type emulsion cosmetic contains (A) powder, (B) a water-soluble thickener, and (C) a surfactant, where the content of the component (A) is 1 to 30 mass% when the total amount of the cosmetic is used as a reference, the component (A) contains (A1) N-acyl acidic amino acid processed powder, the component (C) contains (C1) a solid nonionic surfactant having HLB of less than 7, and (C2) a surfactant having HLB of 7 or more, and a mass ratio [(C1):(C2)] between the component (C1) and the component (C2) is 1.5:1 to 30:1.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an oil-in-water emulsion cosmetic preparation. [Background technology]

[0002] Oil-in-water emulsion cosmetics are highly regarded because they provide a fresh, light feel when used, and are widely used in makeup products, sunscreens, and other applications.

[0003] Since the external phase of oil-in-water emulsion cosmetics is water, when powder components are blended, it is common to combine hydrophilic powders with highly hydrophilic surfactants. However, such cosmetics have problems such as poor water resistance of the cosmetic film after application and makeup coming off due to sweat, etc.

[0004] On the other hand, taking into consideration water resistance and sweat resistance, sunscreen cosmetics have been proposed as oil-in-water emulsion cosmetics containing hydrophobically treated fine metal oxide powders (see, for example, Patent Document 1 below). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-136569 A Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, in the case of makeup products, coloring materials such as pigments are blended as powder components, but oil-in-water emulsion cosmetics blended with hydrophobic pigments have the problem that the product appearance color may appear different from the applied color obtained on the skin after application, making it difficult for the consumer to understand the applied color from the appearance color. On the other hand, oil-in-water emulsion cosmetics blended with hydrophilic pigments have the problem that the color changes upon contact with water due to the poor water resistance of the cosmetic film as described above.

[0007] The present invention aims to provide an oil-in-water emulsion cosmetic that can reduce both the color difference between the appearance color of the product and the color obtained when applied to the skin, and the color difference that occurs when the product comes into contact with water. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides an oil-in-water emulsion cosmetic comprising (A) a powder, (B) a water-soluble thickener, and (C) a surfactant, wherein the content of component (A) is 1 to 30 mass% based on the total amount of the cosmetic, component (A) contains (A1) an N-acyl acidic amino acid-treated powder, component (C) contains (C1) a solid nonionic surfactant having an HLB of less than 7, and (C2) a surfactant having an HLB of 7 or greater, and the mass ratio of component (C1) to component (C2) [(C1):(C2)] is 1.5:1 to 30:1.

[0009] The oil-in-water emulsion cosmetic of the present invention can reduce both the color difference between the appearance color of the product and the color obtained when applied to the skin, and the color difference that occurs when the product comes into contact with water.

[0010] The present inventors speculate as follows as to why the above-mentioned effects are obtained. First, in an oil-in-water emulsion cosmetic containing a hydrophobic pigment, the reason for the color difference between the product appearance color and the applied color obtained on the skin is that the external phase of the oil-in-water emulsion cosmetic is water, but when the cosmetic is applied to the skin, the external phase changes from water to oil during application. That is, the pigment is dispersed in the internal phase in the product state, and the color difference is thought to be caused by the phase change. By having the above-mentioned configuration, the oil-in-water emulsion cosmetic of the present invention can (i) sufficiently disperse the (A1) component in the internal phase, which is an oil phase, while (ii) form a coating film that can sufficiently retain the (A1) component after application. When the (A1) component is used as a coloring material, (i) can obtain an appearance color close to the applied color in the product state, thereby suppressing the color difference caused by the above-mentioned phase change, and (ii) can reduce the color difference that occurs when the cosmetic is brought into contact with water.

[0011] The component (A1) may be a powder treatment agent having an IOB value of 2 to 5.

[0012] The oil-in-water emulsion cosmetic of the present invention can contain, as the above-mentioned component (C2), (C2-1) a nonionic surfactant having an HLB of 7 or more.

[0013] The oil-in-water emulsion cosmetic of the present invention can contain (C2-2) hydrogenated lecithin as the component (C2). Effect of the Invention

[0014] According to the present invention, it is possible to provide an oil-in-water emulsion cosmetic which can reduce both the color difference between the appearance color of the product and the color obtained when applied to the skin, and the color difference which occurs upon contact with water. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The oil-in-water emulsion cosmetic of the present embodiment contains (A) a powder component (sometimes referred to as component (A)), (B) a water-soluble thickener (sometimes referred to as component (B)), and (C) a surfactant (sometimes referred to as component (C)).

[0016] <(A) Powder components> The powder component may be a known powder used in cosmetics, such as a filler powder, a color pigment, etc. The powder may be used without any particular limitations on its shape (e.g., spherical, plate-like, needle-like, etc.); particle size (e.g., mist-like, fine particles, pigment-grade, etc.); particle structure (e.g., porous, non-porous, etc.). The component (A) may be used alone or in combination of two or more kinds.

[0017] The oil-in-water emulsion cosmetic of the present embodiment can contain (A1) N-acyl acidic amino acid treated powder (hereinafter also referred to as (A1) component) as the (A) component. The (A1) component can be used alone or in combination of two or more types.

[0018] The acyl group in the N-acyl acidic amino acid may be an acyl group having 8 to 24 carbon atoms. The acidic amino acid in the N-acyl acidic amino acid may be glutamic acid or aspartic acid. The N-acyl acidic amino acid may be a sodium salt or a potassium salt.

[0019] Examples of N-acyl acidic amino acids include N-stearoyl glutamic acid, N-lauroyl glutamic acid, N-myristoyl glutamic acid, and salts thereof.Specific examples include sodium stearoyl glutamate, disodium stearoyl glutamate, sodium lauroyl glutamate, disodium lauroyl glutamate, potassium myristoyl glutamate, etc.

[0020] The (A1) component is sufficient as long as a part or the whole of the surface of the base powder is covered with the N-acyl acidic amino acid, and the treatment method is not particularly limited, and it can be obtained by a known method such as a dry method, a wet method, etc. The amount of the N-acyl acidic amino acid can be 1 to 10 parts by mass, or may be 1 to 5 parts by mass, relative to 100 parts by mass of the base powder.

[0021] The component (A1) may be a commercially available product such as NAI-treated powder (display name: disodium stearoyl glutamate, disodium N-stearoyl-L-glutamate) manufactured by Miyoshi Chemical Industries, Ltd. Specific examples include NAI-Titanium CR-50 (NAI-treated titanium oxide), NAI-Red R-516PS (NAI-treated red iron oxide), NAI-Yellow LL-100P (NAI-treated yellow iron oxide), and NAI-Black BL-100P (NAI-treated black iron oxide) (all of which are product names manufactured by Miyoshi Chemical Industries, Ltd.).

[0022] The component (A1) may be a powder treatment agent having an IOB value of 2 to 5. In this specification, the IOB value is a well-known value that represents the ratio of inorganic value and organic value determined based on an organic conceptual diagram, and represents the degree of polarity of an oil-based base, and is represented by the following formula (I). IOB = Inorganic value (IV) / Organic value (OV) ... (I) Specifically, the IOB can be calculated from the above formula (I) according to "Prediction of Organic Compounds and Organic Conceptual Diagrams", Fujita (Chemistry Area 11-10), 1957, pp. 719-725, and "Emulsion Formula Design Using Organic Conceptual Diagrams", Nippon Emulsion Co., Ltd., Yaguchi, 1985, p. 98.

[0023] The IOB values ​​(numbers in parentheses) of N-acyl acidic amino acids are shown below. Sodium stearoyl glutamate (2.17), disodium stearoyl glutamate (3.26), sodium lauroyl glutamate (2.94), disodium lauroyl glutamate (4.41), potassium myristoyl glutamate (2.63)

[0024] When component (A1) is a powder that has been treated with two or more types of treating agents, the IOB of each treating agent is multiplied by the amount of each treating agent mixed, and the sum is divided by the total amount mixed.

[0025] The base powder in component (A1) is not particularly limited as long as it is one that is normally used in cosmetics. Examples include extender powders and color pigments. Examples of extender powders include inorganic powders, synthetic inorganic powders, organic powders, metal soaps, and synthetic polymer powders. More specifically, examples include glass powder, silicic anhydride, aluminum silicate, magnesium silicate, aluminum magnesium silicate, mica, synthetic phlogopite (synthetic mica), kaolin, sericite, synthetic sericite, talc, phlogopite, synthetic mica, silica, calcium carbonate, magnesium carbonate, aluminum oxide, boron nitride, silicon carbide, barium sulfate, zinc stearate, aluminum stearate, zinc myristate, polyethylene powder, urethane beads, polymethyl methacrylate, and organopolysiloxane elastomers. Examples of coloring pigments include red iron oxide, yellow iron oxide, black iron oxide, cobalt oxide, chromium oxide, ultramarine, Prussian blue, titanium oxide, zinc oxide, fine particle titanium oxide, pearl pigments (titanium mica, iron oxide coated titanium mica, fine particle titanium oxide coated mica titanium, barium sulfate coated mica titanium, fish scale foil, bismuth oxychloride, aluminum flakes, etc.), organic pigments (Red No. 228, Red No. 226, Blue No. 404, Red No. 202, Yellow No. 4 Aluminum Lake, etc.), and natural colors (carmine, safflower, etc.).

[0026] From the standpoint of improving color difference, the base powder in the component (A1) may be a color pigment.

[0027] From the viewpoints of improving color difference, good spreadability, and evenness, the content of component (A1) in the oil-in-water emulsion cosmetic may be 1% by mass or more, preferably 3% by mass or more, and more preferably 5% by mass or more, based on the total amount of the cosmetic. Also, the content of component (A1) may be 30% by mass or less, 25% by mass or less, or 20% by mass or less, based on the total amount of the cosmetic.

[0028] From the viewpoints of improving color difference and usability, the content of the (A1) component may be 1% by mass or more, preferably 10% by mass or more, and more preferably 20% by mass or more, based on the total amount of the (A) component, and the content of the (A1) component may be 100% by mass or less, 90% by mass or less, or 80% by mass or less, based on the total amount of the (A) component.

[0029] The oil-in-water emulsion cosmetic of this embodiment may contain powders other than the above-mentioned component (A1). Such powders are not particularly limited as long as they are normally used in cosmetics. Examples include extender powders and color pigments. Examples of extender powders include inorganic powders, synthetic inorganic powders, organic powders, metal soaps, and synthetic polymer powders. More specifically, examples include glass powder, silicic anhydride, aluminum silicate, magnesium silicate, aluminum magnesium silicate, mica, synthetic phlogopite (synthetic mica), kaolin, sericite, synthetic sericite, talc, phlogopite, synthetic mica, silica, calcium carbonate, magnesium carbonate, aluminum oxide, boron nitride, silicon carbide, barium sulfate, zinc stearate, aluminum stearate, zinc myristate, polyethylene powder, urethane beads, polymethyl methacrylate, and organopolysiloxane elastomers. Examples of color pigments include red iron oxide, yellow iron oxide, black iron oxide, cobalt oxide, chromium oxide, ultramarine, Prussian blue, titanium oxide, zinc oxide, fine particle titanium oxide, pearl pigments (titanium mica, titanium mica coated with iron oxide, fine particle titanium oxide-coated mica titanium, barium sulfate-coated mica titanium, fish scale foil, bismuth oxychloride, aluminum flakes, etc.), organic pigments (Red No. 228, Red No. 226, Blue No. 404, Red No. 202, Yellow No. 4 Aluminum Lake, etc.), and natural dyes (carmine, safflower, etc.). These powders may not be surface-treated, or may be surface-treated for the purpose of improving usability, dispersibility, etc. Examples of surface treatments include metal soaps, silicone compounds, fluorine compounds, surfactants, and amino acid compounds.

[0030] The content of component (A) in the oil-in-water emulsion cosmetic may be 1% by mass or more, preferably 3% by mass or more, and more preferably 5% by mass or more, based on the total amount of the cosmetic, from the viewpoint of providing functional properties for cosmetic purposes such as coverage, color development, and UV protection. Also, from the viewpoint of usability such as uniformity of the cosmetic film and good spreadability, the content of component (A) may be 30% by mass or less, preferably 25% by mass or less, and more preferably 20% by mass or less, based on the total amount of the cosmetic.

[0031] <(B) Water-soluble thickener> As the water-soluble thickener, a known water-soluble thickener used in cosmetics can be blended, for example, a polysaccharide-based thickener, a clay mineral, an acrylic acid amide copolymer, or a cellulose-based thickener can be used. The (B) component can be used alone or in combination of two or more kinds.

[0032] Examples of polysaccharide thickeners include pectin, guar gum, xanthan gum, carrageenan, gellan gum, gum arabic, and locust bean gum.

[0033] Examples of clay minerals include (Al / Mg) silicate, (Na / Mg) silicate, bentonite, Al silicate, and Na silicate.

[0034] Examples of the acrylic acid amide copolymer include polyacrylamide, (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, (ammonium acryloyldimethyltaurate / VP) copolymer, (ammonium acryloyldimethyltaurate / beheneth-25 methacrylate) crosspolymer, and the like.

[0035] Examples of cellulose-based thickeners include methyl cellulose, ethyl cellulose, carboxymethyl cellulose, cellulose gum (sodium carboxymethyl cellulose), hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methyl cellulose.

[0036] From the viewpoints of even color (uniformity of the applied film) and storage stability, the oil-in-water emulsion cosmetic of the present embodiment may contain, as component (B), one or more selected from the group consisting of xanthan gum, gum arabic, guar gum, tamarind gum, native gellan gum, aluminum / magnesium silicate, bentonite, aluminum silicate, sodium silicate, sodium / magnesium silicate, sodium / magnesium silicate, (hydroxyethyl acrylate / sodium acryloyldimethyl taurate) copolymer, (sodium acrylate / sodium acryloyldimethyl taurate) copolymer, (ammonium acryloyldimethyl taurate / VP) copolymer, and polyacrylamide.

[0037] Furthermore, from the viewpoint of achieving even color (uniformity of the coating film) and improved storage stability, the oil-in-water emulsion cosmetic of the present embodiment may contain, as component (B), two or more members selected from the group consisting of (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, xanthan gum, and (Al / Mg) silicate.

[0038] From the viewpoint of dispersing the component (A1) satisfactorily, the content of the water-soluble thickener in the oil-in-water emulsion cosmetic of the present embodiment may be 0.01 to 5 mass%, 0.05 to 4 mass%, or 0.1 to 3 mass% based on the total amount of the cosmetic.

[0039] <(C) Surfactant> The surfactant may be an anionic surfactant, a cationic surfactant, an amphoteric surfactant, or a nonionic surfactant. The component (C) may be used alone or in combination of two or more.

[0040] The oil-in-water emulsion cosmetic of the present embodiment may contain, as component (C), (C1) a solid nonionic surfactant having an HLB of less than 7 (hereinafter also referred to as component (C1)), and (C2) a surfactant having an HLB of 7 or more (hereinafter also referred to as component (C2)). Each of component (C1) and component (C2) may be used alone or in combination of two or more.

[0041] The HLB value can be calculated based on the formula given in "Technology of Emulsification and Solubilization" published by Kogaku Tosho Co., Ltd. (May 20, 1984), pages 8 to 12. In addition, when a nonionic surfactant is solid, it means that it does not exhibit fluidity at 25°C and does not change into an indeterminate shape.

[0042] Examples of component (C1) include glycerin fatty acid esters such as glyceryl stearate (HLB 3), sorbitan fatty acid esters such as sorbitan palmitate (HLB 6.7), sorbitan stearate (HLB 4.7), and sorbitan sesquistearate (HLB 4.2), and polyethylene glycol fatty acid esters such as PEG-2 stearate (HLB 4.0).

[0043] The component (C1) may have an HLB value of 1 or more and less than 7, or may be 2-6, or may be 3-5.

[0044] Examples of the (C2) component include (C2-1) a nonionic surfactant having an HLB of 7 or more (hereinafter also referred to as the (C2-1) component) and (C2-2) hydrogenated lecithin (hereinafter also referred to as the (C2-2) component). The (C2-1) component and the (C2-2) component may each be used alone or in combination of two or more.

[0045] Examples of the (C2-1) component include polyoxyethylene hydrogenated castor oils such as PEG-40 hydrogenated castor oil (HLB 12.5) and PEG-60 hydrogenated castor oil (HLB 14), polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene sorbitan monooleate (20E.O.) (HLB 15) and polyoxyethylene sorbitan monostearate (20E.O.) (HLB 14.9), polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene sorbitan tetraoleate (HLB: 11.5), and PEG-2 stearate. Examples of suitable fatty acid esters include polyoxyethylene glycerin fatty acid esters such as PEG-0 glyceryl (HLB14), PEG-15 glyceryl stearate (HLB13.5), PEG-10 glyceryl isostearate (HLB10), and PEG-30 glyceryl isostearate (HLB15); polyethylene glycol fatty acid esters such as PEG-12 laurate (HLB13.7); sorbitan fatty acid esters such as sorbitan coconut fatty acid (HLB12); and polyglycerin fatty acid esters such as polyglyceryl-10 stearate (HLB12).

[0046] The (C2-1) component may have an HLB value of 7-18, 9-16, or 10-15.

[0047] The (C2-2) component may have an HLB value of 7-18, 7-15, or 7-11.

[0048] The mass ratio of the (C1) component to the (C2) component [(C1):(C2)] may be 1.5:1 to 30:1, 2:1 to 10:1, or 2:1 to 3.9:1, from the viewpoint of reducing the color difference between the appearance color of the product and the applied color obtained on the skin, and the color difference that occurs upon contact with water.

[0049] When the component (C1) and the component (C2-1) are combined, the mass ratio thereof [(C1):(C2-1)] may be from 1.5:1 to 25:1, or from 2:1 to 15:1.

[0050] When the component (C1) and the component (C2-2) are combined, the mass ratio thereof [(C1):(C2-2)] may be from 1.5:1 to 30:1, or from 2:1 to 20:1.

[0051] The content of component (C) in the oil-in-water emulsion cosmetic of the present embodiment may be 0.1 to 9 mass %, 1 to 5 mass %, or 1 to 3 mass %, based on the total amount of the cosmetic.

[0052] From the viewpoint of storage stability, the total content of the (C1) component and the (C2) component may be 50 mass% or more, 60 mass% or more, 70 mass% or more, or 80 mass% or more based on the total amount of the (C) component, and the total content of the (C1) component and the (C2) component may be 100 mass% or less, 95 mass% or less, or 90 mass% or less based on the total amount of the (C) component.

[0053] The oil-in-water emulsion cosmetic of the present embodiment may further contain an oily component (D) (hereinafter also referred to as component (D)). The component (D) may be used alone or in combination of two or more types.

[0054] Examples of the component (D) include fats and oils, waxes, hydrocarbons, ester oils, higher alcohols, higher fatty acids, silicone oils, oil-soluble ultraviolet absorbers, etc. The component (D) can be used alone or in combination of two or more.

[0055] Examples of the oils and fats include solid oils and fats such as hardened castor oil, hydrogenated jojoba oil, palm oil, and Japan wax oil, and liquid oils and fats such as jojoba seed oil, sunflower seed oil, olive oil, castor oil, macadamia nut oil, camellia oil, rapeseed oil, linseed oil, and triglycerin.

[0056] Examples of waxes include beeswax, carnauba wax, candelilla wax, rice bran wax, sunflower seed wax, rice bran wax, spermaceti wax, and lanolin.

[0057] Examples of the hydrocarbon include polyethylene wax, microcrystalline wax, Fischer-Tropsch wax, ceresin, petrolatum, liquid paraffin, squalane, and mineral oil.

[0058] Examples of ester oils include glyceryl tribehenate, cholesterol fatty acid esters, diisostearyl malate, isopropyl myristate, cetyl 2-ethylhexanoate, isopropyl palmitate, ethylhexyl palmitate, glyceryl tricaprylate / caprate, neopentyl glycol dicaprate, glyceryl tri-2-ethylhexanoate, polyglyceryl triisostearate, dipentaerythrityl tetra(hydroxystearate / isostearate), neopentyl glycol di-2-ethylhexanoate, triethylhexanoin, and dimer acid esters.

[0059] Examples of higher alcohols include stearyl alcohol, behenyl alcohol, cetyl alcohol, cetostearyl alcohol, oleyl alcohol, octyldodecanol, and isostearyl alcohol.

[0060] Examples of higher fatty acids include stearic acid, oleic acid, myristic acid, palmitic acid, isostearic acid, behenic acid, linoleic acid, and linolenic acid.

[0061] Examples of silicone oils include dimethylpolysiloxane, methylphenylpolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and methyltrimethicone.

[0062] From the viewpoints of usability and water resistance, the total content of the component (D) in the oil-in-water emulsion cosmetic of the present embodiment may be 1 to 40 mass % based on the total amount of the cosmetic, or may be 2 to 30 mass %, or may be 3 to 20 mass %.

[0063] The water content in the oil-in-water emulsion cosmetic of the present embodiment may be 1 to 95% by mass, 10 to 90% by mass, 20 to 80% by mass, or 30 to 70% by mass based on the total amount of the cosmetic, from the viewpoints of providing a fresh feeling and good spreadability.

[0064] <Other ingredients> The oil-in-water emulsion cosmetic of the present embodiment may contain components other than those described above. As other components, components normally used in cosmetics, such as aqueous components such as moisturizers and lower alcohols, UV absorbers, antifoaming agents, preservatives, vitamins, cosmetic ingredients, antioxidants, fragrances, etc., may be appropriately blended as necessary within a range that does not impair the effects of the present invention.

[0065] Examples of the moisturizing agent include polyhydric alcohols such as 1,3-butylene glycol (BG), dipropylene glycol (DPG), glycerin, 1,2-pentanediol, sorbitol, mannitol, etc. These may be used alone or in combination of two or more.

[0066] Examples of the lower alcohol include ethanol, propyl alcohol, isopropyl alcohol, isobutyl alcohol, etc. These may be used alone or in combination of two or more.

[0067] The oil-in-water emulsion cosmetic of the present embodiment may have a content of component (A) of 1 to 30 mass% based on the total amount of the cosmetic, the component (A) contains component (A1), the component (C) contains components (C1) and (C2), and the mass ratio of component (C1) to component (C2) [(C1):(C2)] may be 1.5:1 to 30:1.

[0068] Such oil-in-water emulsion cosmetics can maintain sufficient storage stability even when they are substantially free of components having PEG (polyethylene glycol) groups, which are effective in stabilizing oil-in-water emulsion cosmetics. Note that a component having a PEG group is a compound obtained by addition polymerization of ethylene oxide (EO modification) to [-(CH2CH2O)n -] structure and its derivatives.

[0069] From the viewpoint of low skin irritation, the oil-in-water emulsion cosmetic of the present embodiment may be one that does not substantially contain a component having a PEG group. Note that "substantially does not contain a component having a PEG group" means that a component having a PEG group is not separately blended, and does not exclude even a trace amount of a PEG group-containing component (carry-over component) contained in each blended component. The content of the carry-over component in the oil-in-water emulsion cosmetic may be 0.1 mass% or less based on the total amount of the cosmetic.

[0070] From the viewpoints of usability and storage stability, the oil-in-water emulsion cosmetic of the present embodiment may have a viscosity at 25° C. of 500 to 300,000 mPa·s, 1,000 to 200,000 mPa·s, or 2,000 to 100,000 mPa·s.

[0071] The above viscosity refers to a value measured for a sample at 25° C. using a Brookfield viscometer (BM type) or a Brookfield viscometer (BH type) under the following conditions. 250~2500mPa·s: BM type, rotor No.2, rotation speed 12 rpm 1000~10000mPa·s: BM type, rotor No.3, rotation speed 12 rpm 5000~50000mPa·s: BM type, rotor No.4, rotation speed 12 rpm 50,000~400,000mPa·s: BH type, rotor No. 7, rotation speed 10 rpm

[0072] Applications of the oil-in-water emulsion cosmetic of the present embodiment include makeup cosmetics such as blush, eye shadow, foundation, lipstick, concealer, highlighter, makeup base, eyeliner, and eyebrow makeup, body cosmetics such as sunscreen (sunscreen), and hair care cosmetics such as hair wax and hair color.

[0073] [Method of manufacturing oil-in-water emulsion cosmetics] The oil-in-water emulsion cosmetic according to this embodiment can be produced, for example, by mixing and emulsifying the above-mentioned components (A), (B), (C), and (D), as well as other components as necessary.

[0074] As a mixing procedure, for example, the oil phase obtained by mixing the (A), (C1) and (D) components may be mixed with the aqueous phase obtained by mixing the (B), (C2) and water or aqueous components while stirring to emulsify. In addition, the (C) component can be mixed into the aqueous phase if it is a hydrophilic surfactant, and into the oil phase if it is a lipophilic surfactant. The temperature at which the oil phase is prepared is preferably the temperature at which the (C) and (D) components dissolve. The temperature at which the aqueous phase is prepared is preferably the temperature at which the (B) and (C) components dissolve. EXAMPLES

[0075] 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 these examples.

[0076] [Preparation of oil-in-water emulsion cosmetics] (Examples 1 to 24 and Comparative Examples 1 to 7) Oil-in-water emulsion cosmetics (foundations) were prepared according to the formulations shown in Tables 1 to 4 (the numerical values ​​for the blending amounts indicate the contents (mass %) based on the total amount of the cosmetic) by the following method.

[0077] Details of the raw materials in Tables 1 to 4 and in Examples 25 to 27 are as follows.

[0078] <Component (A)> The NAI-treated powders used were from the NAI series manufactured by Miyoshi Chemical Industries, Ltd. The dimethicone-treated powders used were from the SA series manufactured by Miyoshi Chemical Industries, Ltd.

[0079] <(B) component> Copolymer-1: (Hydroxyethyl acrylate / Sodium acryloyldimethyltaurate) copolymer Copolymer-2: (Acryloyldimethyltaurate ammonium / VP) copolymer

[0080] <(C) component> Glyceryl stearate: HLB3, solid Sorbitan stearate: HLB 4.7, solid Polysorbate 80:HLB15 PEG-60 hydrogenated castor oil: HLB14 PEG-10 glyceryl isostearate: HLB10 Sorbitan coconut fatty acid: HLB12 Polyglyceryl-10 stearate: HLB12 Hydrogenated lecithin: HLB7.9 Sorbitan isostearate: HLB5, liquid Sorbitan Sesquioleate: HLB 3.7, liquid

[0081] <Production method> The components (A), (C1), and (D) were mixed, heated to 90°C to dissolve and homogenize, and this was used as the oil phase. Next, the components (B), (C2), and an aqueous component containing water were mixed, heated to 90°C to dissolve, and this was used as the aqueous phase. The oil phase was added to the aqueous phase at 90°C with stirring to emulsify, and then cooled to obtain an oil-in-water emulsion cosmetic (foundation). Note that sorbitan isostearate in Comparative Example 6 and sorbitan sesquioleate in Comparative Example 7 were mixed into the oil phase.

[0082] The oil-in-water emulsion cosmetic thus obtained was evaluated for each item according to the following evaluation methods. The results are shown in Table 5.

[0083] <Color difference between appearance color and coating film> Cosmetics are applied on the artificial skin at 0.5mg / cm 2 The cosmetic was weighed out, spread evenly with a finger wearing a finger cot, and dried at room temperature to form a coating film. * The color difference between the appearance color and the coating film was measured using a color difference meter CR-400 (manufactured by Konica Minolta) and the color difference between the appearance color and the coating film was evaluated according to the following evaluation criteria. [Judgment criteria] ◎:ΔE * <1.5 ○: 1.5≦ΔE * <2 △:2≦ΔE * <2.5 ×:2.5≦ΔE *

[0084] <Color difference after contact with water> Cosmetics are applied on the artificial skin at 0.5mg / cm 2 The mixture was weighed out, spread evenly with a finger wearing a finger cot, and dried at room temperature to form a coating film. 5 mg of water was poured onto the coating film with a dropper, and the water was wiped off. The color difference ΔE between the coating film and the coating film after the water was wiped off was * The color difference after contact with water was measured using a color difference meter CR-400 (manufactured by Konica Minolta) and evaluated according to the following evaluation criteria. [Judgment criteria] ◎:ΔE * <1.5 ○: 1.5≦ΔE * <2.0 ×:2.0≦ΔE *

[0085] <Water resistance (contact angle)> Cosmetics are applied on the artificial skin at 0.5mg / cm 2 A small amount was weighed out, spread evenly with a finger wearing a finger cot, and dried at room temperature to form a coating film. 1-2 ml of water was dropped onto this coating film, and after 1 minute, it was photographed from the side with a camera to obtain an image. From this image, the outline shape of the droplet was analyzed, the contact angle was calculated, and water resistance was evaluated according to the following criteria. The contact angle means the angle between the water droplet and the coating film, and is the value obtained by the tangent method (Tangent 1). [Judgment criteria] ◎: Contact angle is 70° or more ○: Contact angle is 40° or more and less than 70° ×: Contact angle is less than 40°

[0086] <Usability (coverage, good spreadability, even application)> A panel of 10 experts in cosmetic evaluation was asked to use each of the cosmetics of the Examples and Comparative Examples, and evaluate the usability from the viewpoints of covering power, good spreadability, and evenness (uniformity of the applied film). The usability was evaluated on a 5-point scale according to the following evaluation criteria, with each sample given a score, and the average score of all the panelists was then judged according to the following judgment criteria. [Score:Evaluation criteria] 5 points: very good 4 points: Good 3 points: normal 2 points: slightly poor 1 point: Defective [Judgment criteria (average score)] ◎: 4 or more ○: 3 or more and less than 4 △: 2 or more but less than 3 ×: Less than 2

[0087] <Storage stability> The cosmetic was stored at room temperature for one month. After storage, the condition of the cosmetic was visually confirmed, and the storage stability was evaluated according to the following criteria. [Judgment criteria] ○: No change ×: Water release or separation is observed

[0088] [Table 1]

[0089] [Table 2]

[0090] [Table 3]

[0091] [Table 4]

[0092] [Table 5]

[0093] (Example 25: Cheek) (Component) (Mixture ratio (mass%)) 1. NAI treated titanium dioxide 5.0 2. NAI-treated yellow iron oxide 0.8 3. NAI-treated red iron oxide 0.1 4. NAI treated black iron oxide 0.01 5. Red 226 0.15 6. Mica 3.0 7. Mica Titanium 4.0 8. Glass powder 2.0 9. Diisostearyl malate 5.0 10. Triethylhexanoin 10 11. Glyceryl stearate (HLB3) 1.0 12. Polysorbate 80 (HLB15) 0.2 13. Silica 3.0 14. Polymethylmethacrylate 5.0 15.Copolymer-1 0.5 16. Silicate (Al / Mg) 0.5 17.1,3-Butylene glycol 3.0 18. Glycerin 2.0 19. Preservatives (appropriate amount) 20. pH adjuster (appropriate amount) 21.Water Residual

[0094] The details of the above components are the same as those already mentioned above.

[0095] <Production method> Components 1 to 8, 13, and 14 were heated and mixed at 90°C to form an oil phase. Next, components 9 to 12 and 15 to 21 were heated and mixed at 90°C to form an aqueous phase. The oil phase was mixed into the aqueous phase with stirring to emulsify, and then cooled to obtain an oil-in-water emulsion cosmetic (blush).

[0096] <Evaluation> The obtained blush was evaluated in the same manner as above, and the evaluation results confirmed that the color difference between the appearance color and the coating film was "◎", the color difference after contact with water was "◎", the water resistance (contact angle) was "◎", the color development (evaluated in place of covering power) was "◎", the spreadability was "○", the evenness was "○", and the storage stability was "◎".

[0097] (Example 26: Eyeshadow) (Component) (Mixture ratio (mass%)) 1. NAI-treated synthetic gold mica 8.0 2. NAI treated titanium mica 4.0 3. NAI-treated iron oxide-coated titanium mica 6.0 4. Glass powder 2.0 5. Diisostearyl malate 2.0 6. Cetyl ethylhexanoate 10 7. Glyceryl stearate (HLB3) 1.0 8. Hydrogenated lecithin 0.3 9. Silica 3.0 10. Xanthan gum 0.8 11. Silicate (Al / Mg) 0.5 12.1,3-Butylene glycol 3.0 13. Glycerin 2.0 14. Preservatives (appropriate amount) 15. pH adjuster (appropriate amount) 16.Water Residual

[0098] The details of the above components are the same as those already mentioned above.

[0099] <Production method> Components 1 to 8 were heated and mixed at 90°C to form an oil phase. Next, components 9 to 16 were heated and mixed at 90°C to form an aqueous phase. The oil phase was mixed with the aqueous phase while stirring to emulsify, and then cooled to obtain an oil-in-water emulsion cosmetic (eye shadow).

[0100] <Evaluation> The obtained eye shadow was evaluated in the same manner as above, and the evaluation results were as follows: color difference between the appearance color and the applied film "◎", color difference after contact with water "◎", water resistance (contact angle) "◎", color development (evaluated in place of covering power) "◎", good spreadability "◎", evenness "◎", and storage stability "◎".

[0101] Example 27: Sunscreen (Component) (Mixture ratio (mass%)) 1. NAI-treated fine titanium dioxide particles 15.0 2. NAI-treated yellow iron oxide 0.4 3. NAI-treated red iron oxide 0.1 4. NAI treated black iron oxide 0.01 5. Methyl trimethicone 5.0 6. Dimethicone 10 7. Glyceryl stearate (HLB3) 2.0 8. Polysorbate 80 (HLB15) 0.2 9. Hydrogenated lecithin 0.5 10. Silica 3 11.Copolymer-1 0.7 12. Xanthan gum 0.3 13. 1,3-Butylene glycol 3.0 14. Glycerin 2.0 15. Preservatives (appropriate amount) 16. pH adjuster (appropriate amount) 17.Water Residual

[0102] The details of the above components are the same as those already mentioned above.

[0103] <Production method> Components 1 to 7 were heated and mixed at 90°C to form an oil phase, and then components 8 to 17 were heated and mixed at 90°C to form an aqueous phase. The oil phase was mixed into the aqueous phase with stirring to emulsify, and then cooled to obtain an oil-in-water emulsion cosmetic (sunscreen).

[0104] <Evaluation> The obtained sunscreen was evaluated in the same manner as above, and the evaluation results were as follows: color difference between the appearance color and the coating film was "◎", color difference after contact with water was "◎", water resistance (contact angle) was "◎", good spreadability was "◎", evenness was "◎", and storage stability was "◎".

Claims

1. An oil-in-water emulsion cosmetic comprising (A) a powder, (B) a water-soluble thickener, and (C) a surfactant, The content of the component (A) is 1 to 30% by mass based on the total amount of the cosmetic, The component (A) contains (A1) an N-acyl acidic amino acid-treated powder, The component (C) contains (C1) a solid nonionic surfactant having an HLB of less than 7, and (C2) a surfactant having an HLB of 7 or more, the mass ratio of the component (C1) to the component (C2) [(C1):(C2)] is 1.5:1 to 30:1, The component (B) contains a clay mineral and / or an acrylic acid amide copolymer, An oil-in-water emulsion cosmetic, comprising a component having a PEG group in an amount of 0.1 mass% or less based on the total mass of the cosmetic.

2. 2. The oil-in-water emulsion cosmetic according to claim 1, wherein the powder treatment agent in component (A1) has an IOB value of 2 to 5.

3. 3. The oil-in-water emulsion cosmetic according to claim 1, comprising as the component (C2) (C2-1) a nonionic surfactant having an HLB of 7 or more.

4. The oil-in-water emulsion cosmetic according to any one of claims 1 to 3, comprising (C2-2) hydrogenated lecithin as the component (C2).

5. An oil-in-water emulsion cosmetic described in any one of claims 1 to 4, wherein the content of the (B) component is 1.0 to 5 mass %.

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