Oil-in-water emulsified solid cosmetic

Abstract

To provide an oil-in-water emulsified solid cosmetic which is easily taken up and is easy to spread, sufficiently suppresses unevenness of makeup, can obtain excellent cosmetic effects having excellent makeup durability and has excellent stability over time.SOLUTION: There is provided an oil-in-water emulsified solid cosmetic which comprises (A) an aliphatic alcohol having a melting point of 40°C or more, (B) a surfactant, (C) a water-soluble solidifying agent and (D) a polyacrylic acid amide copolymer containing an acryloyldimethyltaurate salt as a constituent unit, wherein the component (B) contains (B-1) a hydrogenated lecithin and (B-2) a surfactant having an HLB of 8 or more (provided, except for 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 to 9.SELECTED DRAWING: None

Description

Technical Field

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

Background Art

[0002] Oil-in-water emulsified cosmetics have the characteristics that, since the external phase is water, a fresh feeling can be obtained when applied to the skin and it is easy to spread on the skin. Oil-in-water emulsified cosmetics are also used as makeup cosmetics such as blush, eyeshadow, foundation, lipstick, etc., 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 made into a solid form using water-soluble solidifying agents such as agar, gelatin, and carrageenan have also been proposed (for example, Patent Document 1 below). In the case of solid cosmetics, the cosmetics filled in a gold plate or the like can be used in a form stored in a compact container, and they are also excellent in portability.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, conventional water-in-oil emulsified solid cosmetics solidified with a water-soluble curing agent have problems that when taking the cosmetics, fingers or applicators tend to slip on the surface of the cosmetics, making it difficult to take an appropriate amount of the cosmetics. In addition, conventional water-in-oil emulsified solid cosmetics tend to have a slippery surface and are difficult to adhere to the skin, making it difficult to achieve both easy spreading and a uniform makeup effect. Specifically, when spreading a makeup product that does not adhere well to the skin (hereinafter sometimes referred to as "slipping"), it will adhere unevenly (hereinafter sometimes referred to as "slipping"), and in the case of makeup cosmetics containing coloring materials, it will lead to uneven makeup. Furthermore, conventional water-in-oil emulsified solid cosmetics also have room for improvement in terms of makeup retention. In addition, water-in-oil emulsified solid cosmetics are likely to cause moisture evaporation and deterioration over time, making it difficult to maintain the initial feeling of use over a long period of time.

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide a water-in-oil emulsified solid cosmetic that is easy to take, easy to spread, sufficiently suppresses uneven makeup, has an excellent makeup effect in terms of makeup retention, and also has excellent stability over time.

Means for Solving the Problems

[0007] In order to solve the above problems, the following inventions are provided.

[0008] [1] A water-in-oil emulsified solid cosmetic containing, as constituent units, (A) an aliphatic alcohol having a melting point of 40°C or higher, (B) a surfactant, (C) a water-soluble curing agent, and (D) a polyacrylamide copolymer containing acryloyldimethyltaurine salt, wherein the component (B) includes (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 (A) / [(B-1)+(B-2)] of the content of the component (A) to the total content of the components (B-1) and (B-2) is 1.2 to 9. [2] The water-in-oil emulsified solid cosmetic according to [1], wherein the mass ratio (B-1) / (B-2) of the content of the component (B-1) to the content of the component (B-2) is 1 to 10. [3] The water-in-oil type emulsified solid cosmetic according to [1] or [2], wherein the component (C) contains agar, and the content of the agar is 0.6 to 3.0% by mass based on the total amount of the water-in-oil type emulsified solid cosmetic. [4] The water-in-oil type emulsified solid cosmetic according to any one of [1] to [3], 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 water-in-oil type emulsified solid cosmetic.

[0009] The water-in-oil type emulsified solid cosmetic described in [1] above is easy to pick up and stretch, has usability that is easy to stretch, can sufficiently suppress makeup unevenness, can obtain a makeup effect excellent in makeup retention, and is also excellent in stability over time. The inventors of the present invention speculate the reasons for such effects as follows. The water-in-oil type emulsified solid cosmetic contains a composite gel of an α-gel formed by the component (A), the component (B-1), and the component (B-2) contained in the above specific ratios, and a gel formed by the component (C). By doing so, when applied, despite being easy to stretch, the gel structure is likely to collapse, so it can adhere to the skin without "slipping" and is considered to sufficiently suppress makeup unevenness. In addition, since the water-in-oil type emulsified solid cosmetic contains the above composite gel, even when powder components such as the component (D) and coloring materials are included, it is possible to impart makeup persistence while maintaining sufficient stretchability. Therefore, the inventors of the present invention believe that a makeup effect excellent in makeup retention can be obtained. Furthermore, it is speculated that the cosmetic is also excellent in stability over time because the change in the emulsified state is suppressed by the thickening effect of the α-gel formed by the above components.

Effects of the Invention

[0010] According to the present invention, it is possible to provide a water-in-oil type emulsified solid cosmetic that is easy to pick up, easy to stretch, can sufficiently suppress makeup unevenness, can obtain a makeup effect excellent in makeup retention, and is also excellent in stability over time.

Modes for Carrying Out the Invention

[0011] The water-in-oil type emulsified solid cosmetic of the present embodiment contains (A) an aliphatic alcohol having 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 solidifying agent (hereinafter sometimes referred to as component (C)), and (D) a polyacrylamide copolymer containing acryloyldimethyltaurine salt as a structural unit (hereinafter sometimes referred to as component (D)).

[0012] <Component (A)> As the aliphatic alcohol having 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 may be linear, branched, saturated, or unsaturated. Component (A) may be used alone or in combination of two or more.

[0013] In this specification, the melting point of the aliphatic alcohol refers to the value measured by the following method. Weigh about 5 mg of the sample and put it into an aluminum sample pan. Attach an aluminum cover to this pan and place it in a differential scanning calorimeter "DSC7020" (manufactured by Hitachi High-Tech Science Corporation, product name). Using an electric cooling unit "Polyscience" (manufactured by Hitachi High-Tech Science Corporation, product name), under a nitrogen gas flow rate of 30 to 35 mL / min, after holding the sample and the reference sample at -10°C for 1 minute, raise the temperature from 0°C to 120°C at a rate of 10°C / min, lower the temperature from 120°C to -10°C at a rate of -10°C / min under the cooling condition, hold at -10°C for 5 minutes, and then raise the temperature from -10°C to 120°C again at a rate of 10°C / min to obtain a melting endotherm curve. The peak temperature of the melting endotherm curve in the second heating at this time is taken as the melting point.

[0014] Specific examples of the component (A) include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, oleyl alcohol, and the like. From the viewpoints of improving the glossiness, adhesiveness, lack of dry feeling, and makeup retention, the component (B) may be an alcohol having a linear saturated hydrocarbon group with 14 to 22 carbon atoms. Examples of such alcohols include myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, and the like. Among these, from the viewpoints of improving the glossiness, adhesiveness, lack of dry feeling, and makeup retention, one or more of cetyl alcohol, stearyl alcohol, and behenyl alcohol may be used. From the viewpoints of stability over time, adhesiveness, and usability, stearyl alcohol and behenyl alcohol may be used in combination. When stearyl alcohol and behenyl alcohol are used in combination, the blending ratio [stearyl alcohol: behenyl alcohol] may be 9:1 to 1:9, 8:2 to 4:6, or 6:4 to 5:5 by mass ratio.

[0015] From the viewpoints of ease of taking and uniformity of the coating film, the content of the component (A) may be 1 to 20% by mass based on the total amount of the oil-in-water type emulsified solid cosmetic. From the viewpoints of adhesiveness during application and ease of taking, it may be 2% by mass or more, or 3% by mass or more. From the viewpoints of lack of makeup unevenness and makeup retention, it may be 15% by mass or less, or 13% by mass or less. From the above viewpoints, it may be 2 to 15% by mass, or 3 to 13% by mass.

[0016] <Component (B)> As the surfactant, those usually used in cosmetics can be used. For example, anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants can be mentioned. These can be used alone or in combination of two or more.

[0017] In the water-in-oil type emulsified solid cosmetic of the present embodiment, the component (B) includes (B-1) hydrogenated lecithin (hereinafter may also be referred to as the component (B-1)) and (B-2) a surfactant having an HLB of 8 or more (however, excluding the component (B-1)) (hereinafter may also be referred to as the component (B-2)).

[0018] The HLB value can be determined based on the calculation formula described on pages 8 to 12 of the engineering book "Emulsification and Solubilization Technology" published by Kogyo Tosho Co., Ltd. (May 20, 1984).

[0019] The HLB of the hydrogenated lecithin as the component (B-1) may be 8.0 to 12.0, or may be 9.0 to 11.0, from the viewpoints of difficulty of separation and percutaneous absorbability of beauty components and moisturizing components.

[0020] The content of the component (B-1) may be 0.5 to 3.0% by mass based on the total amount of the water-in-oil type emulsified solid cosmetic, from the viewpoints of difficulty of separation and percutaneous absorbability of beauty components and moisturizing components. From the viewpoint of ease of taking, it may be 1.0% by mass or more, and from the viewpoint of adhesiveness during application, it may be 2.0% by mass or less. From the above viewpoints, it may be 1.0 to 2.0% by mass.

[0021] Surfactants with an HLB of 8 or higher, which are component (B-2), may be nonionic surfactants. 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 fatty acid esters such as polyoxyethylene sorbitan monooleate (20 E.O.) (HLB 15), polyoxyethylene sorbitan monostearate (20 E.O.) (HLB 14.9), polyoxyethylene sorbit fatty acid esters such as polyoxyethylene sorbit tetraoleate (HLB: 11.5), polyoxyethylene glyceryl fatty acid esters such as glyceryl PEG-20 stearate (HLB 14), glyceryl PEG-15 stearate (HLB 13.5), glyceryl PEG-10 isostearate (HLB 10), glyceryl PEG-30 isostearate (HLB 15), polyethylene glycol fatty acid esters such as PEG-12 laurate (HLB 13.7), sorbitan fatty acid esters such as sorbitan laurate (HLB 12), polyglycerol fatty acid esters such as polyglyceryl-10 stearate (HLB 12), etc. can be mentioned.

[0022] From the perspective of difficulty in separation, the HLB of component (B-2) may be 10.0 to 18.0, or may be 12.0 to 16.0.

[0023] From the perspective of difficulty in separation, the content of component (B-2) may be 0.1 to 2.0% by mass, may be 0.2% by mass or more, or may be 0.3% by mass or more, may be 1.8% by mass or less, or may be 1.5% by mass or less. From the above perspective, it may be 0.2 to 1.8% by mass, or may be 0.3 to 1.5% by mass.

[0024] In the water-in-oil type emulsified solid cosmetic of the present embodiment, from the viewpoints of resistance to separation, ease of removal, and adhesiveness during application, the total content of the component (B-1) and the component (B-2) may be 0.3 to 4.0% by mass based on the total amount of the water-in-oil type emulsified solid cosmetic. From the viewpoints of resistance to separation and ease of removal, it may be 0.8% by mass or more, or 1.0% by mass or more. From the viewpoint of temporal stability with less change in odor and color tone, it may 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.

[0025] In the water-in-oil type emulsified solid cosmetic of the present embodiment, from the viewpoint of resistance to separation, the mass ratio (B-1) / (B-2) of the content of the component (B-1) to the content of the component (B-2) may be 1 to 10. From the viewpoint of ease of removal, it may be 1.5 or more, 2 or more, or 3 or more. From the viewpoint of adhesiveness during application, it may be 8 or less, 7 or less, or 6 or less. From the above viewpoints, it may be 1.5 to 8, 2 to 7, or 3 to 6.

[0026] In the water-in-oil type emulsified solid cosmetic of the present embodiment, from the viewpoints of ease of removal, ease of spreading, adhesiveness, suppression of makeup unevenness, makeup retention, 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) is 1.2 to 9, and may be 1.2 to 8. From the viewpoint of adhesiveness during application, it may be 1.5 or more, or 2.0 or more. From the viewpoints of ease of spreading and lack of makeup unevenness, it may be 8.0 or less, 6.0 or less, or 4.0 or less. From the above viewpoints, it may be 1.5 to 8.0, 2.0 to 6.0, or 0.2 to 4.0. When (A) / [(B-1)+(B-2)] is within the above range, it becomes easy to form a stable α-gel, and a water-in-oil type emulsified solid cosmetic that is easy to remove, easy to spread, has sufficient suppression of makeup unevenness, excellent makeup retention, and excellent temporal stability can be easily obtained.

[0027] (B) component may contain surfactants other than (B-1) component and (B-2) component, but 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.

[0028] In the oil-in-water type emulsified solid cosmetic of the present embodiment, from the viewpoint of stabilizing the emulsified state, the total content of (A) component, (B-1) component and (B-2) component may be 1.3 to 24% by mass, 4 to 18% by mass, or 5 to 10% by mass based on the total amount of the oil-in-water type emulsified solid cosmetic.

[0029] <(C) component> Examples of the water-soluble solidifying agent include agar, gellan gum, carrageenan, xanthan gum, guar gum, etc. (C) component can be used alone or in combination of two or more.

[0030] From the viewpoint of improving the temporal stability of the cosmetic by a good dispersing action, the content of (C) component may be 0.1 to 4.0% by mass or 0.2 to 3.5% by mass based on the total amount of the oil-in-water type emulsified solid cosmetic.

[0031] In the oil-in-water type emulsified solid cosmetic of the present embodiment, from the viewpoint of improving the temporal stability of the cosmetic by a good dispersing action and obtaining a feeling of use having both elasticity and flexibility, agar may be contained as (C) component in an amount of 0.6 to 3.0% by mass based on the total amount of the oil-in-water type emulsified solid cosmetic. Also, the content of agar may be 0.8% by mass or more, or 1.0% by mass or more from the viewpoints of adhesion during application, makeup retention, and ease of removal, and may be 2.5% by mass or less, or 2.0% by mass or less from the viewpoints of evenness of makeup and ease of removal. From the above viewpoints, it may be 0.8 to 2.5% by mass, or 1.0 to 2.0% by mass.

[0032] In the water-in-oil type emulsified solid cosmetic of the present embodiment, from the viewpoint of improving the stability over time and adjusting the usability of the cosmetic by a good dispersing action, gellan gum may be contained as the component (C) in an amount of 0.2 to 1.0% by mass based on the total amount of the water-in-oil type emulsified solid cosmetic.

[0033] In the water-in-oil type emulsified solid cosmetic of the present embodiment, from the viewpoint of improving the stability over time and adjusting the usability of the cosmetic by a good dispersing action, carrageenan may be contained as the component (C) in an amount of 1.5 to 3.5% by mass based on the total amount of the water-in-oil type emulsified solid cosmetic.

[0034] <(Component (D))> Examples of the polyacrylamide copolymer containing acryloyldimethyltaurine salt as a structural unit (copolymer component) include (hydroxyethyl acrylate / sodium acryloyldimethyltaurine) copolymer, (sodium acrylate / sodium acryloyldimethyltaurine) copolymer, (acryloyldimethyltaurine ammonium / VP) copolymer, (acryloyldimethyltaurine ammonium behenate-25 methacrylate) cross-polymer, and the like.

[0035] (D) component can also use commercially available products. For example, commercially available products of (hydroxyethyl acrylate / sodium acryloyldimethyltaurine) copolymer include SEPINOV EMT10, SIMULGEL NS (both manufactured by SEPPIC), etc. Also, commercially available products of (sodium acrylate / sodium acryloyldimethyltaurine) copolymer include SIMULGEL EG (manufactured by SEPPIC), etc. Commercially available products of (acryloyldimethyltaurine ammonium / VP) copolymer include Aristoflex AVC (manufactured by Clariant), etc., and commercially available products of (acryloyldimethyltaurine ammonium behenate-25 methacrylate) cross-polymer include Aristoflex HMB (manufactured by Clariant), etc.

[0036] The content of the (D) component may be 0.1 to 2.0% by mass based on the total amount of the oil-in-water type emulsified solid cosmetic from the viewpoint of improving the stability over time of the cosmetic and adjusting the usability by a good dispersing action. From the viewpoints of adhesion during application and makeup retention, it may be 0.2% by mass or more, or 0.5% by mass or more. From the viewpoint of ease of stretching, it may be 1.8% by mass or less, or 1.5% by mass or less. From the above viewpoints, it may be 0.2 to 1.8% by mass, or 0.5 to 1.5% by mass.

[0037] The oil-in-water type emulsified solid cosmetic of the present embodiment may contain an oily component other than the (A) component. Examples of the oily component include fats and oils, waxes, hydrocarbons, ester oils, higher alcohols other than the (A) component, higher fatty acids, silicone oils, oil-soluble ultraviolet absorbers, and the like. These can be used alone or in combination of two or more.

[0038] Examples of the fats and oils include solid fats and oils such as hydrogenated castor oil, hydrogenated jojoba oil, palm oil, and candelilla wax, and liquid fats and oils such as jojoba seed oil, sunflower seed oil, olive oil, castor oil, macadamia nut oil, camellia oil, rapeseed oil, linseed oil, and triglycerin.

[0039] Examples of the waxes include beeswax, carnauba wax, candelilla wax, rice bran wax, sunflower seed wax, bran wax, spermaceti wax, lanolin, and the like.

[0040] Examples of the hydrocarbons include polyethylene wax, microcrystalline wax, Fischer-Tropsch wax, ceresin, petrolatum, liquid paraffin, heavy liquid isoparaffin, hydrogenated polydecene, squalane, and mineral oil.

[0041] Examples of ester oils include glyceryl tribehenate, cholesterol fatty acid ester, diisostearyl malate, isopropyl myristate, cetyl 2-ethylhexanoate, isopropyl palmitate, ethylhexyl palmitate, glyceryl tricaprylyl / caprate, neopentyl glycol dicaprate, glyceryl tri-2-ethylhexanoate, polyglyceryl triisostearate, pentaerythrityl tetra(hydroxystearate / isostearate), neopentyl glycol di-2-ethylhexanoate, triethylhexanoin, and the like.

[0042] Examples of higher fatty acids include stearic acid, oleic acid, myristic acid, palmitic acid, isostearic acid, behenic acid, linoleic acid, linolenic acid, and the like.

[0043] Examples of silicone oils include dimethylpolysiloxane, methylphenylpolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, methyltrimethicone, and the like.

[0044] From the viewpoint of making the hardness of the cosmetic appropriate and easy to handle, the content of solid oil other than component (A) in the oil-in-water type emulsified solid cosmetic may be 2% by mass or less, 1% by mass or less, or 0% by mass based on the total amount of the oil-in-water type emulsified solid cosmetic.

[0045] The oil-in-water type emulsified solid cosmetic of this embodiment can contain a powder component. Such powders are not particularly limited as long as they are usually used in cosmetics and can be used. For example, extender pigments, coloring pigments, and the like can be mentioned.

[0046] Examples of the powdery base include inorganic powders, synthetic inorganic powders, organic powders, metallic soaps, and synthetic polymer powders. More specifically, examples include glass powder, anhydrous silicic acid, 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 elastomer.

[0047] Examples of the coloring pigments include red iron oxide, yellow iron oxide, black iron oxide, cobalt oxide, chromium oxide, ultramarine, dark blue, titanium oxide, zinc oxide, fine particle titanium oxide, pearl pigments (such as mica titanium, iron oxide-coated mica titanium, fine particle titanium oxide-coated mica titanium, barium sulfate-coated mica titanium, fish scale foil, bismuth oxychloride, and aluminum flakes). These powders may or may not be surface-treated, and may be surface-treated for the purpose of improving usability, dispersibility, etc. Examples of the surface treatment include metallic soaps, silicone compounds, fluorine compounds, surfactants, and amino acid compounds.

[0048] The water-in-oil type emulsified solid cosmetic of this embodiment may contain a pearl pigment. Even in such a case, unevenness of makeup can be sufficiently suppressed due to sufficient spreadability.

[0049] The content of the powdery component in the water-in-oil type emulsified solid cosmetic of this embodiment may be 1.0 to 25.0% by mass, may be 3.0 to 20.0% by mass, or may be 5.0 to 15.0% by mass based on the total amount of the water-in-oil type emulsified solid cosmetic.

[0050] The water-in-oil type emulsified solid cosmetic of the present embodiment is fresh, and from the perspective of achieving both a texture with elasticity and flexibility, ease of picking up, ease of stretching, adhesion, suppression of makeup unevenness, and long-lasting makeup, the water content may be 40 to 70% by mass, 45 to 65% by mass, or 50 to 60% by mass based on the total amount of the water-in-oil type emulsified solid cosmetic.

[0051] The water-in-oil type emulsified solid cosmetic of the present embodiment can contain components other than the above-described components. As other components, components usually used in cosmetics, for example, aqueous components such as humectants, ultraviolet absorbers, defoamers, preservatives, vitamins, beauty components, antioxidants, fragrances, etc. can be appropriately blended as necessary within a range that does not impair the effects of the present invention.

[0052] Examples of the humectant include polyhydric alcohols such as 1,3-butylene glycol (BG), dipropylene glycol (DPG), glycerin, 1,2-pentanediol, sorbitol, and mannitol. These can be used alone or in combination of two or more.

[0053] The water-in-oil type emulsified solid cosmetic of the present embodiment can be used as makeup cosmetics such as cheek, eyeshadow, foundation, lipstick, eyebrow, and highlighter.

[0054] [Manufacturing method of water-in-oil type emulsified solid cosmetic] As a manufacturing method of the water-in-oil type emulsified solid cosmetic according to the present embodiment, for example, water, the above-described components (A), (B), (C), and (D), and other components as necessary are mixed and emulsified, filled into a predetermined container, and solidified to obtain it.

[0055] As a mixing procedure, for example, an oil phase obtained by mixing the (A) component, the (B-2) component, and other oily components may be emulsified by mixing it with a water phase obtained by mixing water, the (B-1) component, the (C) component, the (D) component, and other aqueous components while stirring. The (B-1) component, the (B-2) component, and other surfactants may be mixed with the oil phase, may be mixed with the water phase, or may be separately mixed with the oil phase and the water phase as described above. Further, the powder component may be mixed with the oil phase, may be mixed with the water phase, or may be separately mixed with the oil phase and the water phase.

[0056] The temperature when preparing the oil phase may be a temperature at which the (A) component and other solid oils dissolve. The temperature when preparing the water phase may be room temperature.

[0057] Examples of the predetermined container include a bottle, a dome, a jar, a brush pen, and the like. Examples of the solidification method include allowing to cool naturally and cooling with a cooler.

Examples

[0058] Hereinafter, the present invention will be described in more detail by way of examples, but the technical scope of the present invention is not limited by these examples.

[0059] [Preparation of water-in-oil type emulsified solid cosmetic] (Examples 1 to 20 and Comparative Examples 1 to 5) Using the formulations shown in Tables 1 to 5 (the numerical values of the blending amounts indicate the contents (mass%) based on the total amount of the cosmetic), a water-in-oil type emulsified solid cosmetic (eye shadow) was prepared by the following production method.

[0060] [Production method] Each component of the water phase group was mixed, heated to 80 to 90°C, and after confirming that the water-soluble solidifying agent was completely dissolved, it was uniformly dispersed to obtain a water phase. On the other hand, each component of the oil phase group was mixed, heated to 80 to 90°C for dissolution and homogenization, and this was used as the oil phase. While stirring the water phase at 75 to 85°C, the oil phase was gradually added to the water phase for emulsification, filled into a jar container, and cooled to obtain a water-in-oil type emulsified solid cosmetic.

[0061] 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.

[0062] <Evaluation of Cosmetics> Five professional cosmetic evaluation panelists were asked to apply the cosmetics of the examples and comparative examples to the inner side of the arm using their fingers respectively, and evaluate them from the viewpoints of ease of picking up (able to pick up an appropriate amount), ease of spreading, adhesion during application, evenness of makeup, and makeup retention (the coating film after 6 hours is not easily smeared). Each evaluation was carried out on a five-point scale according to the following evaluation criteria, and a score was given to each sample. Furthermore, the average score of all panelists was judged according to the following judgment criteria. [Score: Evaluation Criteria] 5 points: Very good 4 points: Good 3 points: Ordinary 2 points: Slightly poor 1 point: Poor [Judgment Criteria (Average Score)] ◎: 4 or more ○: 3 or more and less than 4 △: 2 or more and less than 3 ×: Less than 2

[0063] <Long-Term Stability of Cosmetics> The cosmetics filled in a jar container were left standing at 25°C for 1 month. For the cosmetics after standing, "appearance color, applied color, odor, and the above evaluation items" were confirmed, and the long-term stability was evaluated according to the following judgment criteria. [Judgment Criteria] ◎: No change ○: Slight change △: Change (within the allowable range) ×: Marked change

[0064]

Table 1

[0065]

Table 2

[0066]

Table 3

[0067]

Table 4

[0068]

Table 5

[0069] In Tables 1 to 5, the details of the polyacrylamide copolymer as the component (D) are as follows. D-1: "SEPINOV EMT 10" (manufactured by SEPPIC, trade name, (hydroxyethyl acrylate / sodium acryloyldimethyltaurine) copolymer mixture) D-2: "SIMULGEL EG" (manufactured by SEPPIC, trade name, (sodium acrylate / sodium acryloyldimethyltaurine) copolymer mixture) D-3: "Aristoflex HMB" (manufactured by Clariant, trade name, (ammonium acryloyldimethyltaurine / beheneth-25 methacrylate) cross-polymer)

[0070] Also, the melting points of the higher alcohols and the HLB of the surfactants are as follows. Ceteareth alcohol: melting point 50 °C Behenyl alcohol: melting point 66 °C Stearyl alcohol: melting point 61 °C Hydrogenated lecithin: HLB 10.0 PEG-60 hydrogenated castor oil: HLB 14 Polysorbate 80: HLB 15 PEG-11 methyl ether dimethicone: HLB 14.5

[0071] (Example 21: Eyeshadow) (Ingredients) (Mixing ratio (mass%)) 1. Hydrogenated lecithin 1.2 2. Agar 1.2 3. The above D-1 0.8 4. Cinnabar 0.3 5. Titanium oxide 2.2 6. Konnyaku 0.05 7. Mica 6.5 8. Mica matrix pearl 1 9. 1,3-Butylene glycol 17.1 10. Preservative 0.5 11. Glycerin 8 12. Behenyl alcohol 3.4 13. PEG-60 hydrogenated castor oil 0.3 14. Squalane 0.5 15. Cetyl ethylhexanoate 1.1 16. Tocopherol 0.01

[0072] <Manufacturing method> Ingredients 1 to 8 were mixed, heated to 80 to 90°C, and after confirming that the water-soluble solidifying agent was completely dissolved, they were uniformly dispersed to form an aqueous phase. On the other hand, each component of the oil phase group was mixed, heated to 80 to 90°C to dissolve and homogenize, and this was used as the oil phase. While stirring the aqueous phase at 75 to 85°C, the oil phase was gradually added to the aqueous phase to emulsify it, and this was filled into a jar container and cooled to obtain an oil-in-water type emulsified solid cosmetic.

[0073] <Evaluation> When the same evaluation as above was performed on the obtained eyeshadow, it was confirmed that the evaluation was "◎" for ease of stretching, "◎" for adhesion during application, "◎" for lack of makeup unevenness, "◎" for makeup hold, "◎" for ease of taking (able to take an appropriate amount), and "◎" for stability over time.

Claims

1. (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 acryloyldimethyltaurine salt as a constituent unit, and contains the component (B) includes (B-1) hydrogenated lecithin and (B-2) a surfactant having an HLB of 8 or higher (excluding the component (B-1)), an oil-in-water type emulsified solid cosmetic, 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 1.2 to 9.

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

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

4. The oil-in-water type 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 type emulsified solid cosmetic.

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