Oil-in-water type emulsified solid cosmetic

Abstract

The present invention provides an oil-in-water type emulsified solid cosmetic which is easy to take, easy to spread, sufficiently suppressed in makeup irregularities, and excellent in makeup durability, and which has excellent long-term stability. The oil-in-water type emulsion solid cosmetic contains: (A) an aliphatic alcohol having a melting point of 40 DEG C or higher; (B) a surfactant; (C) a water-soluble curing agent; and (D) a polyacrylamide copolymer containing acryloyldimethyltaurine salt as a structural unit, the component (B) contains (B-1) hydrogenated lecithin and (B-2) a surfactant having an HLB of 8 or more (excluding the component (B-1)), and the mass ratio (A) / [(B-1) + (B-2)] of the content of the component (A) to the total content of the component (B-1) and the component (B-2) is 1.2-9.

Description

Technical Field

[0001] The present invention relates to an oil-in-water emulsified solid cosmetic. Background Art

[0002] Since the external phase of an oil-in-water emulsified cosmetic is water, it has the characteristics of providing a moist touch when applied to the skin and being easily spread on the skin. Oil-in-water emulsified cosmetics are also used as color cosmetics such as blushes, eyeshadows, foundations, and lipsticks, and are often filled in tube containers or bottle containers.

[0003] In recent years, in addition to these cosmetic forms, oil-in-water emulsified solid cosmetics in a solid state made using water-soluble solidifying agents such as agar, gelatin, and carrageenan have been proposed (for example, Patent Document 1 below). In the case of solid cosmetics, the form in which the cosmetic filled in a metal dish or the like can be housed in a small container can be utilized, and the portability is also excellent.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Laid-Open No. 5-178723

[0007] However, existing oil-in-water emulsified solid cosmetics solidified with a water-soluble solidifying agent have the problem that when taking the cosmetic, the fingers and application tools easily slip on the surface of the cosmetic, making it difficult to take an appropriate amount of the cosmetic. In addition, existing oil-in-water emulsified solid cosmetics tend to have a slippery surface and are difficult to adhere to the skin, making it difficult to achieve both easy spreadability and a uniform makeup effect. Specifically, when spreading a cosmetic with poor staying power on the skin, it adheres unevenly (hereinafter sometimes also referred to as "false slip"), and in the case of color cosmetics containing coloring materials, it causes uneven makeup. Moreover, there is room for improvement in the makeup durability of existing oil-in-water emulsified solid cosmetics. In addition, oil-in-water emulsified solid cosmetics are prone to water evaporation and deterioration over time, and it is difficult to maintain the initial usability for a long time. Summary of the Invention

[0008] The present invention has been made in view of the above circumstances, and an object thereof is to provide an oil-in-water emulsified solid cosmetic that can achieve a makeup effect that is easy to pick up, easy to spread, sufficiently suppresses uneven makeup, has excellent makeup durability, and also has excellent stability over time.

[0009] In order to solve the above problems, the following invention is provided.

[0010] [1] An oil-in-water emulsified solid cosmetic, which contains: (A) an aliphatic alcohol having a melting point of 40 °C or higher; (B) a surfactant; (C) a water-soluble solidifying agent; and (D) a polyacrylamide copolymer containing acryloyldimethyltaurate as a structural unit, wherein the component (B) contains (B-1) hydrogenated lecithin and (B-2) a surfactant having an HLB of 8 or higher (excluding the component (B-1)), and the mass ratio of the content of the component (A) to the total content of the component (B-1) and the component (B-2) is (A) / [(B-1)+(B-2)] = 1.2 to 9.

[0011] [2] The oil-in-water emulsified solid cosmetic according to [1], wherein the mass ratio of the content of the component (B-1) to the content of the component (B-2) is (B-1) / (B-2) = 1 to 10.

[0012] [3] The oil-in-water emulsified solid cosmetic according to [1] or [2], wherein the component (C) contains agar, and based on the total amount of the oil-in-water emulsified solid cosmetic, the content of the agar is 0.6 to 3.0% by mass.

[0013] [4] The oil-in-water emulsified solid cosmetic according to any one of [1] to [3], wherein based on the total amount of the oil-in-water emulsified solid cosmetic, the content of the solid oil other than the component (A) is 2% by mass or less.

[0014] The oil-in-water emulsified solid cosmetic described in [1] above can achieve a makeup effect with easy pick-up and easy spreading, and uneven makeup is sufficiently suppressed, and the makeup persistence is also excellent, and the stability over time is also excellent. Regarding the reason for such an effect, the present inventors speculated as follows. It is considered that the oil-in-water emulsified solid cosmetic forms a composite gel of an α-gel formed by the above-mentioned component (A), the above-mentioned component (B-1), and the above-mentioned component (B-2) contained in the above-mentioned specific ratio and a gel formed by the above-mentioned component (C). When applied, although it is easy to spread, the gel structure is easily destroyed, so that it can fit on the skin without "false smoothness", and uneven makeup is sufficiently suppressed. In addition, the present inventors believe that the oil-in-water emulsified solid cosmetic can impart makeup retention while maintaining sufficient easy spreadability even in the case of containing the above-mentioned component (D), powder components such as colorants, etc., and thus can achieve an excellent makeup effect with excellent makeup persistence. Furthermore, it is speculated that the reason for the excellent stability over time of the cosmetic is that the change in the emulsified state is suppressed due to the thickening effect of the α-gel formed by the above-mentioned components.

[0015] Advantages of the Invention

[0016] According to the present invention, an oil-in-water emulsified solid cosmetic can be provided, which can achieve a makeup effect that is easy to pick up, easy to spread, with sufficient suppression of uneven makeup, excellent makeup durability, and excellent stability over time. Detailed implementation mode

[0017] The oil-in-water emulsified solid cosmetic of the present implementation mode contains: (A) an aliphatic alcohol with a melting point of 40°C or higher (hereinafter sometimes referred to as component (A)); (B) a surfactant (hereinafter sometimes referred to as component (B)); (C) a water-soluble curing agent (hereinafter sometimes referred to as component (C)); and (D) a polyacrylamide copolymer containing acryloyldimethyltaurate as a structural unit (hereinafter sometimes referred to as component (D)).

[0018] <Component (A)>

[0019] As the aliphatic alcohol with a melting point of 40°C or higher, a monohydric alcohol having an aliphatic hydrocarbon group with 13 to 22 carbon atoms can be used. The aliphatic hydrocarbon group can be any of straight-chain, branched-chain, saturated, and unsaturated. Component (A) can be used alone or in combination of two or more.

[0020] In this specification, the melting point of the aliphatic alcohol refers to the value measured by the following method.

[0021] Weigh about 5 mg of the sample and place it in an aluminum sample pan. Install an aluminum cover on this pan and set it in a differential scanning calorimeter "DSC7020" (manufactured by Hitachi High-Technologies Corporation, product name). Use an electric cooling unit "Polyscience" (manufactured by Hitachi High-Technologies Corporation, product name). Under the condition of a nitrogen flow rate of 30 to 35 mL / min, after keeping the sample and the standard sample at -10°C for 1 minute, heat them from 0°C to 120°C at a heating rate of 10°C / min, cool them from 120°C to -10°C at a cooling rate of -10°C / min, keep them at -10°C for 5 minutes, and then heat them from -10°C to 120°C again at a heating rate of 10°C / min to obtain a melting endothermic curve. Take the peak temperature of the melting endothermic curve in the second heating at this time as the melting point.

[0022] As specific examples of the component (A), the following can be cited: lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, oleyl alcohol, etc. From the viewpoints of improving the glossiness, the adhesiveness, the absence of a dry feeling, and the makeup durability, the component (A) may be an alcohol having a linear saturated hydrocarbon group with 14 to 22 carbon atoms. As such an alcohol, for example, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, etc. can be cited. Among them, from the viewpoints of improving the glossiness, the adhesiveness, the absence of a dry feeling, and the makeup durability, one or more of cetyl alcohol, stearyl alcohol, and behenyl alcohol can be used. From the viewpoints of the stability over time, the adhesiveness, and the usability, stearyl alcohol and behenyl alcohol can also be used in combination. In the case of using stearyl alcohol and behenyl alcohol in combination, the mixing ratio [stearyl alcohol: behenyl alcohol] can be 9:1 to 1:9 by mass ratio, can also be 8:2 to 4:6, or can also be 6:4 to 5:5. A mixture of stearyl alcohol and cetyl alcohol is called cetearyl alcohol. The general ratio of stearyl alcohol and cetyl alcohol in cetearyl alcohol is 50% to 70% and 20% to 30% by mass, respectively.

[0023] Regarding the content of the component (A), from the viewpoints of easy handling and the uniformity of the coating film, based on the total amount of the oil-in-water type emulsified solid cosmetic, it can be 1 to 20% by mass. From the viewpoints of the adhesiveness during application and easy handling, it can also be 2% by mass or more, or 3% by mass or more. From the viewpoints of no makeup unevenness and makeup durability, it can also be 15% by mass or less, or 13% by mass or less. From the above viewpoints, it can be 2 to 15% by mass, or can also be 3 to 13% by mass.

[0024] <Component (B)>

[0025] As the surfactant, surfactants generally used in cosmetics can be used. For example, the following can be cited: anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants. They can be used alone or in combination of two or more.

[0026] In the oil-in-water type emulsified solid cosmetic of the present embodiment, the component (B) contains (B-1) hydrogenated lecithin (hereinafter sometimes referred to as the component (B-1)) and a surfactant having an HLB of 8 or more (excluding the component (B-1)) (hereinafter sometimes referred to as the component (B-2)).

[0027] The HLB value can be obtained based on the calculation formula described on pages 8 to 12 of the engineering book "Emulsification and Solubilization Technology" (Showa 59-5-20), published by Kogyo Chosakai Publishing Co., Ltd.

[0028] From the viewpoint of percutaneous absorbability of difficult-to-separate and beauty ingredients, moisturizing ingredients, etc., the HLB of hydrogenated lecithin as the (B-1) component can be 8.0 to 12.0, or can be 9.0 to 11.0.

[0029] Regarding the content of the (B-1) component, from the viewpoint of percutaneous absorbability of difficult-to-separate and beauty ingredients, moisturizing ingredients, etc., based on the total amount of the oil-in-water type emulsified solid cosmetic, it can be 0.5 to 3.0% by mass. From the viewpoint of easy availability, it can also be 1.0% by mass or more. From the viewpoint of smoothness during application, it can also be 2.0% by mass or less. From the above viewpoints, it can also be 1.0 to 2.0% by mass.

[0030] The surfactant with an HLB of 8 or more as the (B-2) component can also be a nonionic surfactant. For example, polyoxyethylene hydrogenated castor oil such as PEG-40 hydrogenated castor oil (HLB 12.5), PEG-60 hydrogenated castor oil (HLB 14); polyoxyethylene sorbitan monooleate (20E.O) (HLB 15), polyoxyethylene sorbitan monostearate (20E.O.) (HLB 14.9) and other polyoxyethylene sorbitan fatty acid esters; polyoxyethylene sorbitol tetraoleate (HLB: 11.5) and other polyoxyethylene sorbitol fatty acid esters; polyoxyethylene glycerol fatty acid esters such as PEG-20 glycerol stearate (HLB 14), PEG-15 glycerol stearate (HLB 13.5), PEG-10 glycerol isostearate (HLB 10), PEG-30 glycerol isostearate (HLB 15); polyethylene glycol fatty acid esters such as PEG-12 laurate (HLB 13.7); sorbitan cocoate (HLB 12) and other sorbitan fatty acid esters; polyglycerol-10 stearate (HLB 12) and other polyglycerol fatty acid esters.

[0031] From the viewpoint of difficult separation, the HLB of the (B-2) component can be 10.0 to 18.0, or can be 12.0 to 16.0.

[0032] From the viewpoint of difficult separation, the content of the (B-2) component can be 0.1 to 2.0% by mass, or can be 0.2% by mass or more or 0.3% by mass or more, and can also be 1.8% by mass or less or 1.5% by mass or less. From the above viewpoints, it can be 0.2 to 1.8% by mass, or can be 0.3 to 1.5% by mass.

[0033] In the oil-in-water type emulsified solid cosmetic of the present embodiment, regarding the total content of the component (B-1) and the component (B-2), from the viewpoints of being less likely to separate, easy to pick up, and smoothness during application, based on the total amount of the oil-in-water type emulsified solid cosmetic, it may be 0.3 to 4.0% by mass. From the viewpoints of being less likely to separate and easy to pick up, it may also be 0.8% by mass or more, or 1.0% by mass or more. From the viewpoint of the temporal stability in which the odor and hue are less likely to change, it may also be 3.3% by mass or less, or 3.0% by mass or less. From the above viewpoints, it may be 0.8 to 3.3% by mass, or 1.0 to 3.0% by mass.

[0034] In the oil-in-water type emulsified solid cosmetic of the present embodiment, regarding the mass ratio (B-1) / (B-2) of the content of the component (B-1) to the content of the component (B-2), from the viewpoint of being less likely to separate, it may also be 1 to 10. From the viewpoint of easy pick-up, it may also be 1.5 or more, 2 or more, or 3 or more. From the viewpoint of smoothness during application, it may also be 8 or less, 7 or less, or 6 or less. From the above viewpoints, it may also be 1.5 to 8, 2 to 7, or 3 to 6.

[0035] In the oil-in-water type emulsified solid cosmetic of the present embodiment, from the viewpoints of easy pick-up, easy spreading, smoothness, suppression of makeup unevenness, makeup persistence, and temporal stability, the mass ratio (A) / [(B-1)+(B-2)] of the content of the component (A) to the total content of the component (B-1) and the component (B-2) may be 1.2 to 9, or may also be 1.2 to 8. From the viewpoint of smoothness during application, this mass ratio may also be 1.5 or more, or 2.0 or more. From the viewpoints of easy spreading and no makeup unevenness, this mass ratio may also be 8.0 or less, 6.0 or less, or 4.0 or less. From the above viewpoints, this mass ratio may also be 1.5 to 8.0, 2.0 to 6.0, or 2.3 to 4.0. When (A) / [(B-1)+(B-2)] is within the above range, it is easy to obtain an oil-in-water type emulsified solid cosmetic that easily forms a stable α-gel, is easy to pick up, easy to spread, has sufficient suppression of makeup unevenness, excellent makeup persistence, and excellent temporal stability.

[0036] (B) component may also contain surfactants other than the component (B-1) and the component (B-2), and its content may be 2.0% by mass or less, 1.0% by mass or less, or 0.5% by mass or less based on the total amount of the oil-in-water type emulsified solid cosmetic.

[0037] In the oil-in-water type emulsified solid cosmetic of the present embodiment, from the viewpoint of stabilizing the emulsified state, based on the total amount of the oil-in-water type emulsified solid cosmetic, the total content of the component (A), the component (B-1), and the component (B-2) may be 1.3 to 24% by mass, may be 4 to 18% by mass, or may be 5 to 10% by mass.

[0038] <(C) component>

[0039] Examples of the water-soluble curing agent include agar, gellan gum, carrageenan, xanthan gum, guar gum, etc. The component (C) may be used alone or in combination of two or more.

[0040] From the viewpoint of improving the stability of the cosmetic over time through good dispersion, based on the total amount of the oil-in-water type emulsified solid cosmetic, the content of the component (C) may be 0.1 to 4.0% by mass, or may be 0.2 to 3.5% by mass.

[0041] In the oil-in-water type emulsified solid cosmetic of the present embodiment, from the viewpoint of improving the stability of the cosmetic over time through good dispersion and obtaining a feeling of use with both elasticity and softness, based on the total amount of the oil-in-water type emulsified solid cosmetic, as the component (C), it may also contain 0.6 to 3.0% by mass of agar. In addition, from the viewpoints of smoothness during application, makeup durability, and ease of picking up, based on the total amount of the oil-in-water type emulsified solid cosmetic, the content of agar may be 0.8% by mass or more or 1.0% by mass or more. From the viewpoints of no makeup unevenness and ease of picking up, the content of agar may also be 2.5% by mass or less or 2.0% by mass or less. From the above viewpoints, the content of agar may also be 0.8 to 2.5% by mass or 1.0 to 2.0% by mass.

[0042] In the oil-in-water type emulsified solid cosmetic of the present embodiment, from the viewpoint of improving the stability of the cosmetic over time through good dispersion and adjusting the feeling of use, based on the total amount of the oil-in-water type emulsified solid cosmetic, as the component (C), it may also contain 0.2 to 1.0% by mass of gellan gum.

[0043] In the oil-in-water type emulsified solid cosmetic of the present embodiment, from the viewpoint of improving the stability of the cosmetic over time through good dispersion and adjusting the feeling of use, based on the total amount of the oil-in-water type emulsified solid cosmetic, as the component (C), it may also contain 1.5 to 3.5% by mass of carrageenan.

[0044] <(D) component>

[0045] Examples of the polyacrylamide copolymer containing acryloyldimethyltaurate as a structural unit (copolymerization component) include: (2-hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, (ammonium acryloyldimethyltaurate / vinylpyrrolidone) copolymer, (ammonium acryloyldimethyltaurate / behenyl alcohol polyether-25 methacrylate) cross-linked polymer, etc.

[0046] Commercially available products can be used as the component (D). For example, as commercially available products of (2-hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, SEPINOV EMT10, SIMULGEL NS (both are manufactured by SEPPIC Co., Ltd.), etc. can be cited. In addition, as commercially available products of (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, SIMULGEL EG (manufactured by SEPPIC Co., Ltd.) etc. can be cited. As commercially available products of (ammonium acryloyldimethyltaurate / vinylpyrrolidone) copolymer, Aristoflex AVC (manufactured by Clariant Co., Ltd.) etc. can be cited, and as commercially available products of (ammonium acryloyldimethyltaurate / behenyl alcohol polyether-25 methacrylate) cross-linked polymer, Aristoflex HMB (manufactured by Clariant Co., Ltd.) etc. can be cited.

[0047] From the viewpoint of improving the stability over time of the cosmetic and adjusting the usability by good dispersion, based on the total amount of the oil-in-water type emulsified solid cosmetic, the content of the component (D) can be 0.1 to 2.0% by mass. From the viewpoints of the smoothness during application and the makeup durability, the content of the component (D) can also be 0.2% by mass or more or 0.5% by mass or more. From the viewpoint of easy spreadability, the content of the component (D) can also be 1.8% by mass or less or 1.5% by mass or less. From the above viewpoints, the content of the component (D) can also be 0.2 to 1.8% by mass or 0.5 to 1.5% by mass.

[0048] The oil-in-water type emulsified solid cosmetic of this embodiment can contain an oily component other than the component (A). As the oily component, for example, oils and fats, waxes, hydrocarbons, ester oils, higher alcohols other than the component (A), higher fatty acids, silicone oils, oil-soluble ultraviolet absorbers, etc. can be cited. They can be used alone or in combination of two or more.

[0049] As the oils and fats, solid oils and fats such as hydrogenated castor oil, hydrogenated jojoba oil, palm oil, and sumac wax can be cited, and liquid oils and fats such as jojoba seed oil, sunflower seed oil, olive oil, castor oil, macadamia seed oil, camellia seed oil, rapeseed oil, linseed oil, and triglyceride can be cited.

[0050] Examples of waxes include: beeswax, carnauba wax, candelilla wax, rice bran wax, sunflower seed wax, bran wax, spermaceti, lanolin, etc.

[0051] Examples of hydrocarbons include: polyethylene wax, microcrystalline wax, Fischer-Tropsch wax, ozokerite, petrolatum, liquid paraffin, heavy liquid isoparaffin, hydrogenated polydecene, squalane, mineral oil, etc.

[0052] Examples of ester oils include: glyceryl behenate, cholesteryl fatty acid ester, diisostearyl malate, isopropyl myristate, cetyl ethylhexanoate, isopropyl palmitate, ethylhexyl palmitate, triglyceride of caprylic / capric acid, neopentyl glycol dicaprate, triglyceride of triisocapric acid, polyglyceryl triisostearate, dimer pentaerythritol tetra hydroxystearate / tetraisostearate, neopentyl glycol di-2-ethylhexanoate, glyceryl tri(ethylhexanoate).

[0053] Examples of higher fatty acids include: stearic acid, oleic acid, myristic acid, palmitic acid, isostearic acid, behenic acid, linoleic acid, linolenic acid, etc.

[0054] Examples of silicone oils include: dimethylpolysiloxane, methylphenylpolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, methylpolymethylsiloxane, etc.

[0055] Regarding the oil-in-water type emulsified solid cosmetic of the present embodiment, from the viewpoint of making the hardness of the cosmetic appropriate and easy to pick up, based on the total amount of the oil-in-water type emulsified solid cosmetic, the content of the solid oil other than the component (A) can be 2% by mass or less, can also be 1% by mass or less, or can be 0% by mass.

[0056] The oil-in-water type emulsified solid cosmetic of the present embodiment may contain a powder component. As such a powder, any powder commonly used in cosmetics can be used without particular limitation. For example, extender powders, coloring pigments, etc. can be cited.

[0057] Examples of extender powders include: inorganic powders, synthetic inorganic powders, organic powders, metal soaps, synthetic polymer powders, etc. More specifically, glass powder, anhydrous silicic acid, aluminum silicate, magnesium silicate, aluminum magnesium silicate, mica, synthetic phlogopite (synthetic mica), kaolin, sericite, synthetic sericite, talc powder, phlogopite, synthetic mica, silicon dioxide, calcium carbonate, magnesium carbonate, aluminum oxide, boron nitride, silicon carbide, barium sulfate, zinc stearate, aluminum stearate, zinc myristate, polyethylene powder, urethane beads, polymethyl methacrylate, organopolysiloxane elastomer, etc. can be cited.

[0058] Examples of coloring pigments include iron oxide red, iron oxide yellow, iron oxide black, cobalt oxide, chromium oxide, ultramarine, iron blue, titanium dioxide, zinc oxide, fine titanium dioxide, pearlescent pigments (such as mica titania, iron oxide-coated mica titania, fine titanium dioxide-coated mica titania, barium sulfate-coated mica titania, fish scale foil, bismuth oxychloride, flaky aluminum powder, etc.). These powders can be powders without surface treatment, and for the purpose of improving usability, dispersibility, etc., they can also be surface-treated. Examples of surface treatment include metal soaps, silicone compounds, fluorides, surfactants, amino acid compounds, etc.

[0059] The oil-in-water emulsified solid cosmetic of this embodiment may also contain pearlescent pigments. Even in such a case, makeup unevenness can be sufficiently suppressed by sufficient easy spreadability.

[0060] Based on the total amount of the oil-in-water emulsified solid cosmetic, the content of the powder component in the oil-in-water emulsified solid cosmetic of this embodiment can be 1.0 to 25.0% by mass, or can be 3.0 to 20.0% by mass, or can be 5.0 to 15.0% by mass.

[0061] Regarding the oil-in-water emulsified solid cosmetic of this embodiment, from the viewpoints of taking into account moisture, a touch that combines elasticity and softness, easy pick-up, easy spreadability, fit, suppression of makeup unevenness, and makeup durability, based on the total amount of the oil-in-water emulsified solid cosmetic, the water content can be 40 to 70% by mass, or can be 45 to 65% by mass, or can be 50 to 60% by mass.

[0062] The oil-in-water emulsified solid cosmetic of this embodiment may contain components other than the above components. As other components, components commonly used in cosmetics, such as water-based components such as humectants, ultraviolet absorbers, defoamers, preservatives, vitamins, beauty components, antioxidants, fragrances, etc., can be appropriately blended as needed within the range that does not impair the effects of the present invention.

[0063] Examples of humectants include polyhydric alcohols such as 1,3 - butanediol (BG), dipropylene glycol (DPG), glycerin, 1,2 - pentanediol, sorbitol, and mannitol. They can be used alone or in combination of two or more.

[0064] The oil-in-water emulsified solid cosmetic of this embodiment can be used as a color cosmetic such as blush, eyeshadow, foundation, lipstick, eyebrow powder, highlighter, etc.

[0065] [Manufacturing method of oil-in-water emulsified solid cosmetic]

[0066] As a method for manufacturing the oil-in-water type emulsified solid cosmetic of the present embodiment, for example, it can be obtained by mixing water, the above-mentioned component (A), component (B), component (C), component (D), and other components used as needed, emulsifying them, filling them into a specified container, and solidifying them.

[0067] As the mixing step, for example, it is also possible to emulsify by mixing an oil phase obtained by mixing component (A), component (B-2), and other oily components while stirring in an aqueous phase obtained by mixing water, component (B-1), component (C), component (D), and other aqueous components. For component (B-1), component (B-2), and other surfactants, they can be mixed in the oil phase, mixed in the aqueous phase, or separately mixed in the oil phase and the aqueous phase as described above. In addition, the powder component can be mixed in the oil phase, mixed in the aqueous phase, or separately mixed in the oil phase and the aqueous phase.

[0068] The temperature during the preparation of the oil phase can also be the temperature at which component (A) and other solid oils dissolve. The temperature during the preparation of the aqueous phase can also be room temperature.

[0069] Examples of the specified container include: bottles, domes, jars, brushes, etc. Examples of the solidifying method include allowing to cool, cooling using a cooler, etc.

[0070] [Examples]

[0071] Hereinafter, the present invention will be further described in detail by way of examples, but the technical scope of the present invention is not limited by these examples.

[0072] [Preparation of Oil-in-Water Type Emulsified Solid Cosmetic]

[0073] (Examples 1 to 20 and Comparative Examples 1 to 5)

[0074] Using the following manufacturing method, an oil-in-water type emulsified solid cosmetic (eyeshadow) was adjusted according to the formulations shown in Tables 1 to 5 (the numerical values of the blending amounts represent the contents (mass%) based on the total amount of the cosmetic).

[0075] <Manufacturing Method>

[0076] Mix the components of the aqueous phase group, heat to 80 to 90°C, and after confirming that the water-soluble curing agent is completely dissolved, uniformly disperse to form an aqueous phase. On the other hand, mix the components of the oil phase group, heat to 80 to 90°C, dissolve and homogenize them, and use it as the oil phase. While stirring the aqueous phase at 75 to 85°C, gradually add the oil phase to the aqueous phase to emulsify it, fill it into a jar container, and cool it to obtain an oil-in-water type emulsified solid cosmetic.

[0077] For the obtained oil-in-water emulsified solid cosmetic, evaluations of each item were carried out based on the following evaluation methods. The results are shown in Tables 1 to 5.

[0078] <Evaluation of Cosmetics>

[0079] Five members of the cosmetics evaluation panel were each asked to apply the cosmetics of the examples and comparative examples to the inner side of the arm with their fingers, and evaluations were made from the viewpoints of easy access (appropriate amount taken), easy spreading, smoothness during application, no uneven makeup, and makeup persistence (the film after 6 hours is not prone to powder floating). It should be noted that in each evaluation, a 5-level evaluation was carried out according to the following evaluation criteria, scores were given to each sample, and then the average score of all panel members was judged according to the following judgment criteria.

[0080] [Score: Evaluation Criteria]

[0081] 5 points: Very good.

[0082] 4 points: Good.

[0083] 3 points: Ordinary.

[0084] 2 points: Slightly poor.

[0085] 1 point: Poor.

[0086] [Judgment Criteria (Average Score)]

[0087] ◎: 4 or more.

[0088] ○: 3 or more and less than 4.

[0089] △: 2 or more and less than 3.

[0090] ×: Less than 2.

[0091] <Temporal Stability of Cosmetics>

[0092] The cosmetic filled in the can container was left standing at 25°C for 1 month. Regarding the standing cosmetic, "appearance color, applied color, smell, and the above evaluation items" were confirmed, and the temporal stability was evaluated according to the following judgment criteria.

[0093] [Judgment Criteria]

[0094] ◎: No change.

[0095] ○: Minor change.

[0096] △: Change (within allowable range).

[0097] ×: Significant change.

[0098] [Table 1]

[0099]

[0100] [Table 2]

[0101]

[0102] [Table 3]

[0103]

[0104] [Table 4]

[0105]

[0106] [Table 5]

[0107]

[0108] In Tables 1 to 5, the details of the polyacrylamide copolymer as component (D) are as described below.

[0109] D-1: "SEPINOV EMT 10" (manufactured by SEPPIC, trade name, copolymer mixture of hydroxyethyl acrylate / sodium acryloyldimethyltaurate).

[0110] D-2: "SIMULGEL EG" (manufactured by SEPPIC, trade name, copolymer mixture of sodium acrylate / sodium acryloyldimethyltaurate).

[0111] D-3: "Aristoflex HMB" (manufactured by Clariant, trade name, crosslinked polymer of ammonium acryloyldimethyltaurate / behenyl ether-25 methacrylate).

[0112] In addition, the melting points of the higher alcohols and the HLB of the surfactants are as described below.

[0113] Cetearyl alcohol: melting point 50 °C.

[0114] Behenyl alcohol: melting point 66 °C.

[0115] Stearyl alcohol: melting point 61 °C.

[0116] Hydrogenated lecithin: HLB 10.0.

[0117] PEG-60 hydrogenated castor oil: HLB 14.

[0118] Polysorbate 80: HLB 15.

[0119] PEG-11 methylether polydimethylsiloxane: HLB 14.5.

[0120] (Example 21: Eye shadow)

[0121]

[0122] <Production method>

[0123] Mix Components 1 to 8, heat to 80 to 90 °C, and after confirming that the water-soluble curing agent is completely dissolved, disperse evenly to form an aqueous phase. On the other hand, mix the components of the oil phase group, heat to 80 to 90 °C, dissolve and homogenize, and use it as the oil phase. While stirring the aqueous phase at 75 to 85 °C, emulsify it by gradually adding the oil phase to the aqueous phase, fill it into a can container, and cool it to obtain an oil-in-water type emulsified solid cosmetic.

[0124] <Evaluation>

[0125] When the obtained eye shadow was evaluated in the same manner as above, it was confirmed that the easy spreadability was evaluated as "◎", the smoothness during application was evaluated as "◎", the absence of makeup unevenness was evaluated as "◎", the makeup durability was evaluated as "◎", the easy pick-up (appropriate pick-up) was evaluated as "◎", and the stability over time was evaluated as "◎".

Claims

1. An oil-in-water emulsified solid cosmetic comprising the following ingredients: Component A: aliphatic alcohol with a melting point of 40°C or above; Component B: surfactant; Component C: water-soluble curing agent; and Component D: a polyacrylamide copolymer containing acryloyldimethyl taurate as a structural unit, The B component comprises the following components, Ingredient B-1: hydrogenated lecithin; and Component B-2: a surfactant having an HLB value of 8 or more, wherein: Except for the B-1 component, The mass ratio (A) / [(B-1)+(B-2)] of the content of the component A to the total content of the component B-1 and the component B-2 is 1.2 to 9.

2. The oil-in-water emulsified solid cosmetic according to claim 1, wherein The mass ratio (B-1) / (B-2) of the content of the B-1 component to the content of the B-2 component is 1 to 10.

3. The oil-in-water emulsified solid cosmetic according to claim 1 or 2, wherein The C component comprises agar, Based on the total amount of the oil-in-water emulsified solid cosmetic, the content of the agar is 0.6-3.0% by mass.

4. The oil-in-water emulsified solid cosmetic according to claim 1 or 2, wherein The content of the solid oil other than the component A is 2% by mass or less based on the total amount of the oil-in-water emulsified solid cosmetic.

5. The oil-in-water emulsified solid cosmetic according to claim 1 or 2, wherein The total content of the component A, the component B-1, and the component B-2 is 1.3 to 24% by mass based on the total amount of the oil-in-water emulsified solid cosmetic.

6. The oil-in-water emulsified solid cosmetic according to claim 1 or 2, wherein The mass ratio (A) / [(B-1)+(B-2)] of the content of the component A to the total content of the component B-1 and the component B-2 is 2.0 to 6.

0.

7. The oil-in-water emulsified solid cosmetic according to claim 1 or 2, wherein The component A comprises at least one selected from lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol and oleyl alcohol.

8. The oil-in-water emulsified solid cosmetic according to claim 1 or 2, wherein The B-2 component includes at least one selected from polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerol fatty acid ester, polyethylene glycol fatty acid ester, sorbitan fatty acid ester and polyglycerol fatty acid ester.

9. The oil-in-water emulsified solid cosmetic according to claim 1 or 2, wherein The component D comprises at least one selected from (hydroxyethyl acrylate / sodium acryloyldimethyl taurate) copolymer, (sodium acrylate / sodium acryloyldimethyl taurate) copolymer, (ammonium acryloyldimethyl taurate / vinyl pyrrolidone) copolymer and (ammonium acryloyldimethyl taurate / behenyl alcohol polyether-25 methacrylate) cross-linked polymer.

10. The oil-in-water emulsified solid cosmetic according to claim 1 or 2, wherein The content of the component D is 0.1 to 2.0% by mass based on the total amount of the oil-in-water emulsified solid cosmetic.

Images