Water-in-oil emulsified solid cosmetics

Abstract

Provided is a water-in-oil emulsified solid cosmetic material which contains (A) a wax component, (B) a volatile silicone oil, (C) a silicone surfactant and (D) a powder, wherein the (A) wax component contains ceresin, an isoparaffin wax and a fatty acid ester wax. The provided cosmetic material imparts a dry feeling to the coated surface, is a solid at room temperature yet liquefies when external pressure is applied thereto, has superb use properties, is unlikely to exhibit cracking (splitting) in the surface thereof even at low temperatures, and is unlikely to exhibit sweating from the oil component thereof.

Description

Technical Field

[0001] The present invention relates to water-in-oil emulsion solid cosmetics. More specifically, the present invention relates to water-in-oil emulsion solid cosmetics that can be suitably used for makeup cosmetics such as foundation, concealer, blush, eyeshadow, eyebrow, blusher, lipstick, etc., and sunscreen cosmetics.

Background Art

[0002] Water-in-oil emulsion solid cosmetics have the advantages of giving a smooth feeling to the skin, being easy to use because they are solid, and having good usability such as portability.

[0003] In recent years, as a water-in-oil emulsion solid cosmetic having sufficient hardness, a fresh transparency, a quick finish, a good feeling in use without creaking, and excellent in both shape retention and usability, (a) silicone oil, (b) a wax containing refined rice wax having an iodine value and an acid value of 3.0 or less, and (c) a polyoxyalkylene-modified organopolysiloxane are blended, and a solid water-in-oil emulsion cosmetic in which the content of the refined rice wax in the wax is 30% by mass or more has been proposed (see, for example, Patent Document 1).

[0004] In water-in-oil emulsion solid cosmetics, as seen in the above solid water-in-oil emulsion cosmetics, wax is used to solidify the water-in-oil emulsion cosmetics. However, when the wax content in the water-in-oil emulsion cosmetics is high, the surface of the water-in-oil emulsion cosmetics becomes hard, so there is a drawback that it is difficult to take out the water-in-oil emulsion cosmetics from the container in which the water-in-oil emulsion cosmetics are contained. Therefore, when the wax content in the water-in-oil emulsion cosmetics is lowered to soften the surface of the water-in-oil emulsion cosmetics, there are drawbacks such as seepage of oil from the surface of the water-in-oil emulsion cosmetics, generation of oil droplets (hereinafter referred to as "sweating of oil"), and cracking (crazing) of the water-in-oil emulsion cosmetics at low temperatures.

Prior Art Documents

[0005] [Patent Document 1] JP 2009-215232 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in view of the above-mentioned conventional techniques, and an object of the present invention is to provide a water-in-oil emulsified solid cosmetic which is unlikely to cause oily sweating, is unlikely to develop cracks (fissures) on the surface even at low temperatures, is solid at room temperature but liquefies when an external stress is applied, is excellent in usability, and imparts a smooth feeling to the applied surface. [Means for solving the problem]

[0007] The present invention relates to a water-in-oil type emulsified solid cosmetic composition comprising (A) a wax component, (B) a volatile silicone oil, (C) a silicone surfactant, and (D) a powder, wherein the wax component (A) contains ceresin, an isoparaffin wax, and a fatty acid ester wax. and in the water-in-oil emulsion solid cosmetic, the content of ceresin is 3 to 6 mass%, the content of the isoparaffin wax is 0.1 to 0.3 mass%, the content of the volatile silicone oil is 5 to 23 mass%, the content of the silicone surfactant is 1.5 to 3 mass%, and the content of the powder is 10 to 20.9 mass%. The present invention relates to a water-in-oil emulsified solid cosmetic preparation. Effect of the Invention

[0008] According to the present invention, there is provided a water-in-oil emulsified solid cosmetic which is unlikely to cause oily sweating, is unlikely to develop cracks (fissures) on the surface even at low temperatures, is solid at room temperature but liquefies when an external stress is applied, is excellent in usability, and imparts a smooth feeling to the applied surface. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic explanatory diagram showing the structure of the water-in-oil emulsified solid cosmetic of the present invention. [Diagram 2] 1 is a transmission electron microscope photograph, used as a drawing, of the water-in-oil emulsion solid cosmetic preparation obtained in Example 1 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] As described above, the water-in-oil type emulsified solid cosmetic of the present invention contains (A) a wax component, (B) a volatile silicone oil, (C) a silicone surfactant, and (D) a powder. The water-in-oil type emulsified solid cosmetic of the present invention contains the above-mentioned components (A) to (D), especially the above-mentioned components (A) to (C), and since the wax component (A) contains ceresin, isoparaffin wax, and fatty acid ester wax, it is difficult for oily sweat to occur, the surface is unlikely to crack (crack) even at low temperatures, it is solid at room temperature but liquefies when external stress is applied, it is excellent in usability, and it exhibits the excellent property of imparting a smooth feeling to the applied surface.

[0011] (A) Wax component The wax component contains ceresin, an isoparaffin wax and a fatty acid ester wax.

[0012] [Ceresin] Ceresin is a microcrystalline n-paraffinic hydrocarbon compound having 29 to 35 carbon atoms, which is obtained by refining ozokerite, a type of wax found near petroleum producing areas. Ceresin has a melting point of about 60 to 95°C, and is solid at room temperature. Ceresin is readily available commercially, for example from Nikko Rica Corporation.

[0013] In the present invention, since the water-in-oil type emulsion solid cosmetic contains ceresin, the water-in-oil type emulsion solid cosmetic exhibits the following excellent properties: it is less likely to cause oily sweating, it is less likely to develop surface cracks (fissures) even at low temperatures, it is solid at room temperature but liquefies when external stress is applied, and it has excellent usability.

[0014] In the water-in-oil emulsified solid cosmetic, the content of ceresin is preferably 3% by mass or more from the viewpoint of suppressing sweating of the oil component and the occurrence of cracking (cracking) at low temperatures, being solid at room temperature but liquefying when an external stress is applied, and improving usability. From the viewpoint of improving the spreadability when the water-in-oil emulsified solid cosmetic is applied to the skin, it is preferably 6% by mass or less.

[0015] 〔Isoparaffin wax〕 Isoparaffin wax is a kind of petroleum wax and is a wax mainly containing isoparaffin. In the present invention, since the water-in-oil emulsified solid cosmetic contains isoparaffin wax, the water-in-oil emulsified solid cosmetic hardly causes sweating of the oil component, hardly causes cracking (cracking) on the surface even at low temperatures, is solid at room temperature but liquefies when an external stress is applied, and exhibits excellent properties such as excellent usability.

[0016] Among isoparaffin waxes, isoparaffin wax composed of branched-chain aliphatic hydrocarbons having 31 to 50 carbon atoms is preferable from the viewpoint of excellent adhesiveness during heating and suppressing sweating of the oil component.

[0017] In addition, the water-in-oil emulsified solid cosmetic may contain an appropriate amount of other paraffin waxes other than ceresin and isoparaffin wax within a range that does not inhibit the object of the present invention. Examples of other paraffin waxes include n-paraffin wax composed of linear aliphatic hydrocarbons having 20 to 36 carbon atoms, but the present invention is not limited to such examples.

[0018] In the present invention, microcrystalline wax can be preferably used as the isoparaffin wax. The melting point of microcrystalline wax is higher than that of n-paraffin wax and is 72 to 101°C. Microcrystalline wax is a wax that can be easily obtained commercially, for example, from Yamatsuki Sangyo Co., Ltd.

[0019] The content of isoparaffin wax in the water-in-oil emulsion solid cosmetic is preferably 0.1% by mass or more from the viewpoint of suppressing cracking due to sweating and shrinkage of the oil content of the water-in-oil emulsion solid cosmetic, and is preferably 0.3% by mass or less from the viewpoint of improving the applicability when the water-in-oil emulsion solid cosmetic is applied to the skin.

[0020] [Fatty acid ester wax] Examples of fatty acid ester waxes include vegetable waxes such as carnauba wax (also called carnauba wax), candelilla wax, rice wax, sunflower wax, and Japan wax, but the present invention is not limited to these examples. Fatty acid ester waxes have the property of binding oily raw materials and the property of adjusting hardness. Among fatty acid ester waxes, fatty acid ester waxes having a melting point of 80° C. or more are preferred, and carnauba wax is more preferred, from the viewpoint of fully expressing the property of binding oily raw materials.

[0021] The content of fatty acid ester wax in the water-in-oil emulsion solid cosmetic is preferably 0.1% by mass or more from the viewpoint of suppressing cracking due to sweating and shrinkage of the oil content of the water-in-oil emulsion solid cosmetic, and is preferably 0.2% by mass or less from the viewpoint of improving the applicability when the water-in-oil emulsion solid cosmetic is applied to the skin.

[0022] [Other waxes] In the present invention, a suitable amount of wax other than ceresin, isoparaffin wax and fatty acid ester wax may be contained within a range that does not impair the object of the present invention.

[0023] Examples of other waxes include waxes derived from animals such as beeswax and beeswax, but the present invention is not limited to these examples. These waxes may be used alone or in combination of two or more kinds. The melting point of the other waxes is not particularly limited, but is usually preferably 60 to 120°C.

[0024] (B) Volatile silicone oil In the present invention, since the water-in-oil emulsion solid cosmetic contains a volatile silicone oil, the water-in-oil emulsion solid cosmetic exhibits the excellent properties of being less likely to cause oily sweating, being less likely to develop cracks (fissures) on the surface even at low temperatures, and imparting a smooth feeling to the applied surface.

[0025] Volatile silicone oil is a liquid silicone oil having fluidity at room temperature (25°C). Examples of volatile silicone oil include volatile silicone oils having a boiling point of 300°C or less at 1 atmospheric pressure, and linear or branched silicone oils having a viscosity of preferably 10cs or less, more preferably 5cs or less at room temperature (25°C), but the present invention is not limited to these examples. These volatile silicone oils may be used alone or in combination of two or more kinds. Among the volatile silicone oils, cyclic silicone oils having 4 to 6 silicon atoms and linear silicone oils having 2 to 5 silicon atoms are preferred.

[0026] Specific examples of volatile silicone oils include cyclic silicone oils such as cyclopentasiloxane, hexamethylcyclotrisiloxane (D3), octamethyltetracyclosiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6); short-chain dimethicone (methylpolysiloxane) [methylpolysiloxane with a viscosity of 2cs, 1.5cs, or 1cs at room temperature (25°C)], methyltrimethicone, heptamethylhexyltrisiloxane, heptamethyloctyltrisiloxane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, and dodecamethylpentasiloxane, but the present invention is not limited to these examples.These volatile silicone oils may be used alone or in combination of two or more kinds.

[0027] The content of volatile silicone oil in the water-in-oil emulsion solid cosmetic is preferably 5% by mass or more, and more preferably 6% by mass or more, from the viewpoints of imparting a powdery feel when the water-in-oil emulsion solid cosmetic is applied and suppressing cracking due to shrinkage, and is preferably 25% by mass or less, more preferably 23% by mass or less, and even more preferably 22% by mass or less, from the viewpoints of suppressing sweating of the oil content of the water-in-oil emulsion solid cosmetic.

[0028] [Other volatile oils] In the present invention, a suitable amount of volatile oil other than the volatile silicone oil may be contained within a range that does not impair the object of the present invention.

[0029] Other volatile oils include paraffinic hydrocarbon oils such as isododecane, isodecane, isohexadecane, n-decane, n-undecane, and n-dodecane, isoparaffinic hydrocarbon oils such as cyclodecane, light liquid isoparaffin, hydrogenated polyisobutenes other than the hydrogenated polyisobutenes having a degree of polymerization of 15 to 50, and cyclic paraffinic hydrocarbon oils such as cyclododecane, but the present invention is not limited to these examples. These volatile oils may be used alone or in combination of two or more kinds.

[0030] [Non-volatile oil] In the present invention, from the viewpoint of imparting a "moist feeling" (emollient effect), which is the property of suppressing evaporation of water from the skin, maintaining moisture in the skin, and softening the skin after application of the water-in-oil emulsified solid cosmetic preparation, it is preferable to use a combination of a volatile silicone oil and a non-volatile oil.

[0031] The non-volatile oil is not particularly limited as long as it is a non-volatile oil that can be used in cosmetics. Examples of non-volatile oils include non-volatile silicone oils (silicone oils other than the volatile silicone oils), ester oils, etc., but the present invention is not limited to these examples. Specific examples of non-volatile oils include dimethicone (methylpolysiloxane), diphenylsiloxyphenyltrimethicone, diisostearyl malate, ethylhexyl methoxycinnamate, etc., which have a viscosity of 10cs, 6cs, or 5cs at room temperature (25°C), but the present invention is not limited to these examples. These non-volatile oils may be used alone or in combination of two or more.

[0032] The amount of non-volatile oil is desirably adjusted so that the mass ratio of the volatile silicone oil to the non-volatile oil (volatile oil / non-volatile oil) is preferably 0.16 to 1.0, and more preferably 0.17 to 1.0, from the viewpoints of suppressing evaporation of water from the skin after application of the water-in-oil emulsion solid cosmetic, imparting a moist feeling (emollient effect), and improving the usability of the water-in-oil emulsion solid cosmetic.

[0033] (C) Silicone-based surfactants In the present invention, since the water-in-oil emulsified solid cosmetic contains a silicone surfactant, the emulsification of the volatile silicone oil is promoted, and a smooth feel is imparted to the applied surface of the water-in-oil emulsified solid cosmetic.

[0034] The silicone surfactant preferably has a silicone skeleton in the main skeleton and a hydrophilic group in the side chain. Examples of silicone surfactants include polyoxyalkylene-modified silicones and polyglycerin-modified silicones, but the present invention is not limited to these examples. Specific examples of silicone surfactants include polyethylene glycol (9) polydimethylsiloxyethyl dimethicone (PEG-9 polydimethylsiloxyethyl dimethicone) (the number in parentheses indicates the number of moles of ethylene oxide added. The same applies below), polyethylene glycol (10) polydimethylsiloxyethyl dimethicone (PEG-10 dimethicone), lauryl polyethylene glycol (9) polydimethylsiloxyethyl dimethicone (lauryl PEG-9 polydimethylsiloxyethyl dimethicone), but the present invention is not limited to these examples. These silicone surfactants may be used alone or in combination of two or more. Silicone surfactants can be easily obtained commercially from, for example, Shin-Etsu Chemical Co., Ltd.

[0035] The lower limit of the silicone surfactant content in the water-in-oil emulsion solid cosmetic is preferably at least 1% by mass, more preferably at least 1.5% by mass, from the viewpoints of promoting emulsification of the volatile silicone oil and imparting a smooth feeling to the application surface of the water-in-oil emulsion solid cosmetic, and the upper limit of the silicone surfactant content is preferably no greater than 3% by mass, from the same viewpoints as above.

[0036] [Surfactants other than silicone surfactants] The water-in-oil emulsion solid cosmetic preparation may contain an appropriate amount of surfactants other than silicone surfactants within the scope of the present invention. Examples of surfactants other than silicone surfactants include nonionic fatty acid ester surfactants with an HLB value of 5 or less, such as sorbitan sesquiisostearate, but the present invention is not limited to these examples.

[0037] (D) Powder In the water-in-oil type emulsion solid cosmetic, a powder is contained in the water-in-oil type emulsion solid cosmetic from the viewpoint of imparting a powdery feel when the water-in-oil type emulsion solid cosmetic is applied.

[0038] The powder includes inorganic particles and organic powder. These powders may be used alone or in combination. Among the powders, inorganic powders are preferably used.

[0039] Examples of inorganic powders include titanium oxide, black titanium oxide, red iron oxide, yellow iron oxide, black iron oxide, mica, red iron oxide, sericite, talc, kaolin, bentonite, magnesium oxide, zinc oxide, aluminum oxide, zirconium oxide, chromium oxide, magnesium carbonate, calcium carbonate, aluminum silicate, magnesium silicate, silicon carbide, barium sulfate, etc., but the present invention is not limited to these examples. These metal oxide particles may be used alone or in combination.

[0040] The powder is preferably subjected to a silicone treatment on its surface in order to impart a powdery feel when the water-in-oil emulsion solid cosmetic is applied and to suppress cracking due to shrinkage. The silicone-treated powder is a powder having silicone attached to all or part of its surface. Examples of silicones used in the silicone treatment include triethoxycaprylsilane, dimethicone (methylpolysiloxane), and methicone, but the present invention is not limited to these examples. The silicone content in the silicone-treated powder is not particularly limited, but is usually about 0.5 to 3 mass%.

[0041] The average primary particle size of the powder is not particularly limited, but from the viewpoint of improving dispersibility in a water-in-oil emulsion solid cosmetic, it is preferably 0.1 μm or more, more preferably 0.3 μm or more, even more preferably 1 μm or more, and even more preferably 3 μm or more, and from the viewpoint of reducing roughness when the water-in-oil emulsion solid cosmetic is applied to the skin, it is preferably 200 μm or less, more preferably 100 μm or less, even more preferably 80 μm or less, and even more preferably 50 μm or less. The average primary particle size of the powder means the median size determined from the volume-based particle size distribution measured by a laser scattering method.

[0042] The amount of powder varies depending on the type of powder, and therefore cannot be determined in general terms. It is therefore preferable to determine the amount of powder appropriately depending on the type of powder. powder The content of is preferably 10% by mass or more, more preferably 15% by mass or more, from the viewpoint of imparting a powdery feel when the water-in-oil emulsion solid cosmetic is applied to the skin, and is preferably 30% by mass or less, more preferably 25% by mass or less, from the viewpoint of suppressing cracking due to sweating and shrinkage of the oil content of the water-in-oil emulsion solid cosmetic.

[0043] If necessary, the powder may be used in combination with a crosspolymer within a range that does not impair the object of the present invention. The crosspolymer is a component that imparts an appropriate feel to the water-in-oil emulsion solid cosmetic preparation and provides it with good spreadability on the skin.

[0044] Examples of crosspolymers include (vinyl dimethyl / methicone silsesquioxane) crosspolymer, (vinyl dimethicone / lauryl dimethicone) crosspolymer, (vinyl dimethicone / methicone silsesquioxane) crosspolymer, (diphenyl dimethicone / vinyl diphenyl dimethicone / silsesquioxane) crosspolymer, (dimethicone / vinyl dimethicone) crosspolymer, (dimethicone / phenyl vinyl dimethicone) crosspolymer, etc., but the present invention is not limited to these examples. These crosspolymers may be used alone or in combination.

[0045] [Ultraviolet ray scattering agent] In the present invention, an appropriate amount of an ultraviolet scattering agent can be used to impart light scattering properties to the water-in-oil emulsion solid cosmetic preparation. The ultraviolet scattering agent is usually a fine particle having a particle size of about 10 to 40 nm, and is therefore used in distinction from the above-mentioned powder.

[0046] Examples of ultraviolet scattering agents include titanium oxide particles and zinc oxide particles, but the present invention is not limited to these examples.

[0047] (E) Other ingredients In the present invention, the water-in-oil type emulsified solid cosmetic may contain other ingredients in appropriate amounts, if necessary, such as chelating agents such as sodium ethylenediaminetetraacetic acid salt, ultraviolet absorbers, antioxidants, colorants, thickeners, preservatives, antioxidants, texture improvers, moisturizers, fragrances, pH adjusters, astringents, etc. These ingredients may be used alone or in combination of two or more kinds.

[0048] Water-in-oil type emulsified solid cosmetic preparations may contain a water-soluble organic solvent as necessary. Examples of water-soluble organic solvents include ethanol, propanol, butanol, ethylene glycol, diethylene glycol, propanediol, glycerin, diglycerin, and phenoxyethanol, but the present invention is not limited to these examples. The water-soluble organic solvents may be used alone or in combination of two or more. The content of the water-soluble organic solvent in the water-in-oil type emulsified solid cosmetic preparations cannot be determined in general because it varies depending on the type of the water-soluble organic solvent, but it is usually preferably 20% by mass or less. In addition, from the viewpoint of fully expressing the effect of including the water-soluble organic solvent in the water-in-oil type emulsified solid cosmetic preparations, the content of the water-soluble organic solvent in the water-in-oil type emulsified solid cosmetic preparations is preferably 1% by mass or more.

[0049] In the water-in-oil type emulsified solid cosmetic, the balance of the components (A) to (D) and the components contained as necessary is water. Therefore, water is contained in the water-in-oil type emulsified solid cosmetic so that the content of each of the components (A) to (D) and the components contained as necessary in the water-in-oil type emulsified solid cosmetic is a predetermined value. It is preferable to use purified water as the water.

[0050] (F) Water-in-oil emulsified solid cosmetic A water-in-oil type emulsion solid cosmetic preparation can be obtained, for example, by mixing components (A) to (D), water, and other components that may be included as necessary, and then placing the resulting dispersion in a container of a given shape and molding it. When preparing the dispersion, each component may be mixed while being heated as necessary so that each component is uniformly dispersed.

[0051] The water-in-oil type emulsified solid cosmetic preparation can be used by being filled into a container, such as a resin container or a metal container, the inner surface of which has a predetermined shape.

[0052] The shape of the water-in-oil type emulsified solid cosmetic product varies depending on the application of the water-in-oil type emulsified solid cosmetic product and cannot be generally determined, so it is preferable to determine the shape appropriately according to the application. Examples of the shape of the water-in-oil type emulsified solid cosmetic product include a stick shape, a plate shape, a cylinder shape, etc., but the present invention is not limited to only these examples.

[0053] The water-in-oil emulsion solid cosmetic obtained in the above manner exhibits the excellent properties of being less susceptible to oily sweating, being less susceptible to surface cracking (fissures) even at low temperatures, being solid at room temperature but liquefying when subjected to external stress, being excellent in usability, and imparting a smooth feel to the applied surface.

[0054] The reason why the water-in-oil type emulsified solid cosmetic of the present invention exhibits such excellent properties is unclear, but it is believed that the water-in-oil type emulsified solid cosmetic contains (A) a wax component, (B) a volatile silicone oil, and (C) a silicone surfactant. , thisIt is presumed that this is because the so-called "house of cards structure" is formed in the water-in-oil emulsified solid cosmetic, the ceresin contained in the (A) wax component forms the walls of the house of cards structure, and the isoparaffin wax and fatty acid ester wax contained in the (A) wax component stabilize the house of cards structure.

[0055] As shown in Figure 1, the water-in-oil emulsion solid cosmetic of the present invention forms a card-house structure in which a component (water-in-oil emulsion component) containing volatile silicone oil 2 and aqueous component 3 (silicone-based surfactant and water) and powder 4 are confined inside a chamber composed of wax component 1, and when external stress is applied to the water-in-oil emulsion solid cosmetic, the chamber collapses, releasing the component (water-in-oil emulsion component) containing volatile silicone oil 2 and aqueous component 3 and powder 4 from the chamber. The released components become cream-like, and when this is applied to the skin, the volatile components contained in the water-in-oil emulsion solid cosmetic volatilize, improving the spreadability of the water-in-oil emulsion solid cosmetic and imparting a powdery and smooth feel to the skin.

[0056] It should be noted that FIG. 1 is a schematic diagram for explaining the structure of the water-in-oil emulsion solid cosmetic preparation of the present invention, and the present invention is not limited to this schematic diagram.

[0057] As explained above, water-in-oil emulsion solid cosmetics are unlikely to cause oily sweating, are unlikely to develop cracks (fissures) on the surface even at low temperatures, are solid at room temperature but liquefy when external stress is applied, are excellent in usability, and have the excellent property of imparting a smooth feeling to the applied surface, so they can be suitably used in makeup cosmetics such as foundation, concealer, blush, eye shadow, eyebrow, blusher, and lipstick, as well as sunscreen cosmetics. EXAMPLES

[0058] Next, the water-in-oil type emulsified solid cosmetic preparation of the present invention will be described in more detail based on examples, but the present invention is not limited to such examples.

[0059] Examples 1 to 21 and Comparative Examples 1 to 15 The components shown in Tables 1 and 2 (units of the amount of each component: mass %) were mixed to a uniform composition, and the resulting dispersion was degassed and then filled into a mold having an inner shape corresponding to the predetermined shape of the water-in-oil emulsion solid cosmetic, thereby obtaining a water-in-oil emulsion solid cosmetic.

[0060] The powder used had an average primary particle size in the range of 0.1 to 50 μm, and the light scattering agent had a particle size in the range of 0.005 to 0.05 μm. Details of the components listed in each table are as follows.

[0061] Short-chain dimethicone: Methylpolysiloxane with a viscosity of 10cs at 25℃ Silicone-treated titanium dioxide: Titanium dioxide that has been surface-treated with dimethicone Silicone-treated red iron oxide: Red iron oxide that has been surface-treated with dimethicone Silicone-treated yellow iron oxide: Yellow iron oxide that has been surface-treated with dimethicone Silicone-treated black iron oxide: Black iron oxide surface-treated with dimethicone Silicone-treated mica: Mica with a surface treatment using dimethicone Titanium oxide / mica / tin oxide / triethoxycaprylylsilane: Powder with surface treatment using triethoxycaprylylsilane (silicone) (Vinyl dimethyl / methicone silsesquioxane) crosspolymer: Ingredient that can be used in combination with powder EDTA-2Na: Ethylenediaminetetraacetic acid disodium salt

[0062] [Table 1]

[0063]

Table 2

[0064] The transmission electron micrograph of the water-in-oil emulsion solid cosmetic obtained in Example 1 is shown in Fig. 2. In Fig. 2, the white linear part is plate wax, and the black part is the component containing oil, aqueous component and powder.

[0065] From the results shown in Fig. 2, it can be seen that the water-in-oil emulsion solid cosmetic has a card house structure in which oil, aqueous component and powder 4 are confined inside the room composed of wax.

[0066] Next, as the performance of the water-in-oil emulsion solid cosmetic obtained above, sweating, cracking, degree of solidification, usability, thixotropy and powdery (powder) feeling of the oil were evaluated based on the following methods. The results are shown in Table 3 and Table 4.

[0067] (1) Sweating of oil The water-in-oil emulsion solid cosmetic liquefied by heating to about 80 °C was filled into a foundation container at room temperature (about 25 °C), the container was stored in a constant temperature bath at 50 °C, taken out from the constant temperature bath after 1 month from the start of storage, and the surface of the water-in-oil emulsion solid cosmetic was visually observed at room temperature and evaluated based on the following evaluation criteria. 〔Evaluation criteria〕 ◎: There is no oil seepage on the surface of the water-in-oil emulsion solid cosmetic, and no oil droplets are observed (qualified). 〇: Slight oil seepage is observed on the surface of the water-in-oil emulsion solid cosmetic, but no oil droplets are observed (qualified). ×: Oil seepage and oil droplets are observed on the surface of the water-in-oil emulsion solid cosmetic (unqualified).

[0068] (2) Cracking The water-in-oil emulsion solid cosmetic product is liquefied by heating to approximately 80°C and filled into a foundation container at room temperature (approximately 25°C). The container is then stored in a thermostatic bath at 0°C. One month after the start of storage, the container is removed from the thermostatic bath and the surface of the water-in-oil emulsion solid cosmetic product is visually observed at room temperature and evaluated based on the following evaluation criteria. [Evaluation Criteria] ⊚: No cracks (fissures) were observed on the surface of the water-in-oil emulsion solid cosmetic preparation (passed). ×: Cracks (fissures) are clearly observed on the surface of the water-in-oil emulsion solid cosmetic preparation (failure).

[0069] (3) Degree of solidification The water-in-oil emulsion solid cosmetic product is liquefied by heating to approximately 80°C and filled into a foundation container at room temperature (approximately 25°C). After leaving it for one hour, the surface of the water-in-oil emulsion solid cosmetic product is visually observed at room temperature and evaluated based on the following evaluation criteria. [Evaluation Criteria] ◎: The water-in-oil emulsion solid cosmetic preparation has solidified (passed). Good: The water-in-oil emulsion solid cosmetic is slightly solidified (passed). ×: The water-in-oil emulsion solid cosmetic preparation does not solidify (failure).

[0070] (4) Usability A water-in-oil emulsion solid cosmetic that has been liquefied by heating to approximately 80°C is poured into a foundation container at room temperature (approximately 25°C) and left to stand for one hour. The cosmetic is then picked up by a puff at room temperature and observed for ease of removal, and evaluated based on the following criteria. [Evaluation Criteria] ⊚: The cosmetic can be easily applied to the puff (passed). Good: The cosmetic is not easily transferred to the puff, but can be picked up by the puff (passed). ×: It is difficult to easily apply the cosmetic to the puff (fail).

[0071] (5) Thixotropy A water-in-oil emulsion solid cosmetic that has been liquefied by heating to approximately 80°C is poured into a foundation container at room temperature (approximately 25°C) and left to stand for one hour. After that, the cosmetic is examined to see whether it is solid when picked up by a puff at room temperature and whether it changes to a liquid when pressure is applied to the cosmetic, and is evaluated based on the following evaluation criteria. [Evaluation Criteria] ⊚: The cosmetic is solid when applied to the puff, and changes to a liquid state when pressure is applied to the cosmetic (passed). ×: The cosmetic material is not solid when applied to the puff (failed).

[0072] (6) Powdery feel After applying the water-in-oil emulsion solid cosmetic preparation to the skin, the powdery feeling when touching the skin with the fingers is evaluated based on the following evaluation criteria. [Evaluation Criteria] ◎: The surface on which the cosmetic is applied does not feel sticky and feels smooth (passed). ×: The applied surface of the cosmetic feels sticky or does not feel smooth (failed).

[0073] In addition, any water-in-oil emulsion solid cosmetic having even one "x" rating in the table is deemed to have failed.

[0074] [Table 3]

[0075] From the results shown in Table 3, it can be seen that the water-in-oil emulsion solid cosmetics obtained in each Example all solidified at room temperature, there was no oil bleeding or oil droplets on the surface of the water-in-oil emulsion solid cosmetics, no cracks (fissures) were generated on the surface of the water-in-oil emulsion solid cosmetics even when stored at low temperatures, the cosmetic was solid when applied to the puff, and changed to a liquid state when pressure was applied to the cosmetic, making it easy to apply to the puff, and the applied surface of the cosmetic did not feel sticky but rather had a smooth feel. [Explanation of symbols]

[0076] 1. Wax component 2. Volatile silicone oil 3 Aqueous component 4 Powder

Claims

[Claim 1] A water-in-oil type emulsion solid cosmetic comprising (A) a wax component, (B) a volatile silicone oil, (C) a silicone surfactant, and (D) a powder, The (A) wax component contains ceresin, an isoparaffin wax, and a fatty acid ester wax, The water-in-oil type emulsion solid cosmetic is characterized in that the ceresin content is 3 to 6 mass %, the isoparaffin wax content is 0.1 to 0.3 mass %, the volatile silicone oil content is 5 to 23 mass %, the silicone surfactant content is 1.5 to 3 mass %, and the powder content is 10 to 20.9 mass %.

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