Method for producing powdery solid cosmetic material and powdery solid cosmetic material

Abstract

The present invention provides a powdery solid cosmetic material that contains a humectant, that is capable of reducing or suppressing the generation of water droplets, and that has excellent usability.　A method for producing a powdery solid cosmetic material according to the present disclosure comprises: preparing an oil phase part that contains a humectant and an oil component, the oil phase part preparation including mixing the components constituting the oil phase part to form a dispersion in which the humectant is dispersed in the oil component; and mixing the oil phase part and a powder to form a mixture. A powdery solid cosmetic material according to the present disclosure contains a powder, a humectant, and an oil component, and the humectant is dispersed in the oil component.

Description

Method for producing powder solid cosmetic product, and powder solid cosmetic product

[0001] The present disclosure relates to a method for producing a solid cosmetic product in powder form, and a solid cosmetic product in powder form.

[0002] BACKGROUND ART Powder solid cosmetics containing powder components that can be used for foundations and the like are known.

[0003] Patent Document 1 discloses a powder-containing solid makeup cosmetic, which contains 33% by mass or more of an oil component and 3 to 15% by mass of a moisturizer relative to the total mass of the cosmetic.

[0004] Patent Document 2 discloses a solid powder cosmetic preparation containing (A) ethyl cellulose, (B) a liquid monohydric alcohol having a total of 18 to 24 carbon atoms, (C) a powder, (D) a liquid ester oil having a molecular weight of 1100 or less and one or more hydroxyl groups, a moisturizer, and the like.

[0005] JP 2012-197241 A JP 2019-104690 A

[0006] When a moisturizing agent is blended into a powder solid cosmetic product, the product may feel dry when used, and under humid conditions, water droplets may form on the surface of the cosmetic product, causing caking.

[0007] Therefore, an object of the present disclosure is to provide a powdery solid cosmetic preparation containing a moisturizing agent that can reduce or inhibit the generation of water droplets and is easy to use.

[0008] Aspect 1: A method for producing a powder solid cosmetic, comprising: preparing an oil phase part containing a humectant and an oil, wherein the components constituting the oil phase part are mixed to form a dispersion in which the humectant is dispersed in the oil, and mixing the oil phase part and a powder to form a mixture. Aspect 2: The method according to Aspect 1, wherein the humectant comprises at least one selected from the group consisting of glycerin and a dihydric glycol. Aspect 3: The method according to Aspect 1 or 2, wherein the content of the humectant is 1.0 mass% or more relative to the total amount of the cosmetic. Aspect 4: The method according to any of Aspects 1 to 3, wherein the oil phase part has a viscosity of 17,000 mPa·s or more at 80°C. Aspect 5: The method according to any of Aspects 1 to 4, wherein the average particle size of the humectant dispersed in the oil is 100 μm or less. Aspect 6: The method according to any of Aspects 1 to 5, wherein the production method is a dry molding method. Aspect 7: The manufacturing method according to any one of Aspects 1 to 5, wherein the manufacturing method is a wet molding method and includes blending the mixture in an oily dispersion medium to form a slurry. Aspect 8: The manufacturing method according to Aspect 7, wherein the oily dispersion medium includes at least one oil selected from the group consisting of silicone oil and hydrocarbon oil. Aspect 9: A powder solid cosmetic comprising a powder, a humectant, and an oil component, wherein the humectant is dispersed in the oil component. Aspect 10: The cosmetic according to Aspect 9, wherein the humectant includes at least one oil selected from the group consisting of glycerin and a dihydric glycol. Aspect 11: The cosmetic according to Aspect 9 or 10, wherein the humectant is contained in an amount of 1.0 mass% or more relative to the total amount of the cosmetic. Aspect 12: The cosmetic according to any one of Aspects 9 to 11, wherein the oil component includes at least one oil selected from the group consisting of silicone oil and hydrocarbon oil. Aspect 13: The cosmetic according to any one of Aspects 9 to 12, wherein the moisturizing agent dispersed in the oil has an average particle size of 100 μm or less.

[0009] According to the present disclosure, it is possible to provide a solid cosmetic preparation in powder form containing a moisturizer, which can reduce or inhibit the generation of water droplets and is easy to use.

[0010] Fig. 1 is a photograph showing the state of a moisturizer dispersed in oil when using a method for producing a solid cosmetic product in powder form according to one embodiment of the present disclosure. Fig. 2 is a photograph showing the state of a moisturizer dispersed in oil when using a method for producing a solid cosmetic product in powder form according to another embodiment of the present disclosure.

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings as necessary. The present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the present invention.

[0012] The solid cosmetic in powder form according to the present disclosure can be formed by mixing the moisturizer and oil components that constitute the oil phase part to form an oil phase part that is a dispersion in which the moisturizer is dispersed in the oil, and then mixing this oil phase part (dispersion) with powder.

[0013] Without being limited by the principle, the principle of action of the powder solid cosmetic preparation of the present disclosure, which, despite containing a moisturizing agent, can reduce or inhibit the generation of water droplets and is also excellent in usability, is believed to be as follows.

[0014] As described in Patent Document 1, for example, solid cosmetic preparations in powder form are generally produced by simultaneously blending an oil and any oily ingredients with a powder component, and then uniformly mixing them. When a solid cosmetic preparation in powder form containing a moisturizer is produced using this production method, it is thought that large particles of the moisturizer are exposed and attached to the powder particles. As a result, it is thought that the moisturizer in this state may absorb moisture, causing water droplets to form on the surface of the cosmetic, or may adversely affect usability.

[0015] On the other hand, the solid cosmetic powder preparation of the present disclosure is produced by mixing the moisturizing agent and oil components constituting the oil phase part, dispersing the moisturizing agent in the oil, and then blending the resulting dispersion (oil phase part) with the powder component. In other words, according to the method for producing the solid cosmetic powder preparation of the present disclosure, the minute moisturizing agent is mixed with the powder while being enveloped in the oil, which is believed to reduce the amount of exposed moisturizing agent adhering to the powder. Alternatively, it is believed that the moisturizing agent is in the form of finer particles than moisturizing agents in solid cosmetic powder preparations obtained by conventional manufacturing methods, which reduces the moisture absorption ability of the moisturizing agent on the cosmetic surface. Due to this effect, the solid cosmetic powder preparation of the present disclosure is able to reduce or inhibit the generation of water droplets despite containing a moisturizing agent, and is also believed to improve usability. The dispersion of the moisturizing agent in the oil at minute particle sizes was confirmed using an optical microscope, as shown in Figures 1 and 2. Here, at least the particles indicated in the figures correspond to minute-sized moisturizing agents (moisturizing agent particles). Furthermore, for example, when an oil that is solid at room temperature (e.g., 25°C) is used, the finely dispersed moisturizing agent particles can be fixed in the oil in the final cosmetic product, which is believed to result in a more stable powder solid cosmetic product.

[0016] It should be noted that Patent Document 1 does not implement the manufacturing method of the present disclosure. Therefore, if a powder solid cosmetic having the same composition as that of Patent Document 1 (e.g., a powder solid cosmetic containing 33% or more by mass of oil) is produced using the manufacturing method of the present disclosure, it is believed that the effect of reducing water droplet generation and / or usability will be further improved. Furthermore, Patent Document 1 does not implement the manufacturing method of the present disclosure, and the moisturizing agent in the powder solid cosmetic is not present in a dispersed state in the oil. Therefore, it is believed that the cosmetic described in Patent Document 1 and the powder solid cosmetic of the present disclosure are different as "substances." Furthermore, while the powder solid cosmetic of Patent Document 1 is required to contain 33% or more by mass of oil, it has been confirmed that the effect of reducing water droplet generation and / or usability can be improved according to the manufacturing method of the present disclosure, even if the oil content is less than 33% by mass.

[0017] The definitions of terms used in this disclosure are as follows:

[0018] In the present disclosure, "usability" refers to the ease of use of a powder solid cosmetic, and refers to, for example, whether a moist feel is obtained rather than a dry feel when used, the ease of taking up the cosmetic with a puff from a compact case filled with the powder solid cosmetic (smoothness of the cosmetic), or the ease of applying the obtained cosmetic to the skin (for example, whether the cosmetic can be lightly applied to the skin).

[0019] <<Method for Producing a Solid Cosmetic in Powder>> The method for producing a solid cosmetic in powder form according to the present disclosure (sometimes simply referred to as the "production method") comprises: (1) preparing an oil phase part containing a moisturizer and an oil, and mixing the components that make up this oil phase part to form a dispersion in which the moisturizer is dispersed in the oil, and (2) mixing the obtained oil phase part (dispersion) with a powder to form a mixture. As long as it includes steps (1) and (2), the production method according to the present disclosure can be carried out using either a dry molding method or a wet molding method.

[0020] The method for preparing the oil phase part containing a humectant and an oil is not particularly limited, and can be appropriately set depending on, for example, the types of humectant and oil, the average particle size required for the humectant particles, and the required performance (e.g., usability and water droplet reduction performance). For example, the oil phase part can be prepared by mixing the humectant, oil, and other components constituting the oil phase part using a mixing device such as a homogenizer, mixer, or disperser. The mixing device can be used alone or in combination of two or more types. Among these, a homogenizer is preferred from the viewpoint of uniform mixing performance of the humectant, oil, and the like.

[0021] The mixing conditions (e.g., stirring speed, stirring time, stirring temperature) are not particularly limited and can be set appropriately depending on, for example, the types of moisturizer and oil, the average particle size required for the moisturizer particles, and the required performance (e.g., usability and performance in reducing water droplet generation).

[0022] Specifically, the stirring speed can be, for example, 500 rpm or more, 700 rpm or more, 1,000 rpm or more, 2,000 rpm or more, 3,000 rpm or more, 4,000 rpm or more, or 5,000 rpm or more, and can be 20,000 rpm or less, 17,000 rpm or less, 15,000 rpm or less, 13,000 rpm or less, 10,000 rpm or less, 9,000 rpm or less, 8,000 rpm or less, or 7,000 rpm or less. The stirring speed can be appropriately set within such a range. For example, when blending each component constituting the oil phase part, the stirring speed may be the same or different.

[0023] Specifically, the stirring time can be, for example, 10 seconds or more, 30 seconds or more, 50 seconds or more, 1 minute or more, 3 minutes or more, 5 minutes or more, 7 minutes or more, or 10 minutes or more, and can be 30 minutes or less, 20 minutes or less, 15 minutes or less, 10 minutes or less, 5 minutes or less, or 3 minutes or less. The stirring time can be appropriately set within such ranges. For example, when blending each component constituting the oil phase part, the stirring time may be the same or different.

[0024] The stirring temperature can be, for example, equal to or higher than the melting temperature of the moisturizer and / or oil. Specifically, the stirring temperature can be, for example, equal to or higher than 80°C, equal to or higher than 85°C, or equal to or higher than 90°C, and can be equal to or lower than 120°C, equal to or lower than 110°C, or equal to or lower than 100°C. The stirring temperature can be appropriately set within such a range. For example, when blending each component constituting the oil phase part, the stirring temperature may be the same or different.

[0025] From the viewpoints of the fine dispersion of the humectant in the oil, the associated effect of reducing water droplet generation, and usability, the viscosity of the oil phase part is preferably 17,000 mPa·s or more, 18,000 mPa·s or more, 19,000 mPa·s or more, or 20,000 mPa·s or more at 80°C to 85°C (e.g., 80°C). There is no particular upper limit to this viscosity, and it can be, for example, 500,000 mPa·s or less, 300,000 mPa·s or less, 200,000 mPa·s or less, 150,000 mPa·s or less, or 100,000 mPa·s or less. Here, the viscosity of the oil phase part is the melt viscosity, and this viscosity is determined at a predetermined temperature of 80°C to 85°C (e.g., 80°C), using a rotor No. The viscosity can be measured using an L-type viscometer (manufactured by Shibaura Semtech Co., Ltd.) under conditions of 6 and 10 rpm. The temperature "80°C" refers to the temperature at the time of viscosity measurement.

[0026] The method for mixing the obtained oil phase part (dispersion) and powder is not particularly limited, and for example, a known mixing method employed in the dry molding method and the wet molding method can be used as appropriate.

[0027] <Dry molding method> In some embodiments, the solid cosmetic preparation in powder form of the present disclosure can be produced by a dry molding method. In the dry molding method, following the steps (1) and (2) above, the obtained mixture is filled into a container to obtain the solid cosmetic preparation in powder form.

[0028] <Wet molding method> In some embodiments, the solid cosmetic preparation in powder form of the present disclosure can be produced by a wet molding method. The wet molding method includes, following the above-mentioned steps (1) and (2), blending the resulting mixture into an oily dispersion medium to form a slurry. By using an oily dispersion medium instead of an aqueous dispersion medium as the dispersion medium, the moisturizing agent is more likely to adhere to the powder in a state dispersed in oil in the final solid cosmetic preparation in powder form.

[0029] The oily dispersion medium can be appropriately selected according to the type of oil and / or moisturizing agent used.As the oily dispersion medium, the oil described below can be used similarly.Among them, from the viewpoint of the fine dispersion of the moisturizing agent in the oil, the effect of reducing the generation of water droplets, the moisturizing effect and usability, at least one selected from the group consisting of silicone oil and hydrocarbon oil is preferred.The oily dispersion medium can be used alone or in combination of two or more.

[0030] The oily dispersion medium may contain an alcohol component (e.g., a lower alcohol component such as ethanol) within a range that does not adversely affect the effects of the present invention. However, from the viewpoint of favorably dispersing the moisturizer in the oil, the amount of the alcohol component is preferably 10% by mass or less, 5.0% by mass or less, 3.0% by mass or less, 1.0% by mass or less, 0.5% by mass or less, or 0.1% by mass or less, relative to the total amount of the oily dispersion medium, and it is more preferable that no alcohol component is contained.

[0031] In the wet molding method, in addition to the steps described above, at least one step selected from the group consisting of filling the slurry into a container, removing the oily dispersion medium from the container filled with the slurry, and drying can be further carried out.

[0032] <<Solid Cosmetic in Powder>> The solid cosmetic in powder form of the present disclosure (sometimes simply referred to as "cosmetic") comprises a powder, a moisturizer, and an oil, with the moisturizer dispersed in the oil. Such a cosmetic can be in the form of, for example, a pressed powder. The solid cosmetic in powder form of the present disclosure can typically be obtained by the above-described production method. Therefore, matters relating to the components constituting the solid cosmetic in powder form, such as the powder, oil, and moisturizer, which will be described later, can also be used in the above-described production method.

[0033] In some embodiments, the solid cosmetic preparation in powder form of the present disclosure can reduce or suppress the generation of water droplets on the surface of the cosmetic preparation in a high-humidity environment. For example, at 37°C, in an environment with a relative humidity of 80% RH or more, 85% RH or more, 90% RH or more, 95% RH or more, or 98% RH or more, and 100% RH or less, or less than 100%, the generation of water droplets on the surface of the cosmetic preparation can be reduced or suppressed for 1 day or more, 5 days or more, 1 week or more, 2 weeks or more, 3 weeks or more, or 4 weeks or more. There is no particular upper limit to this period, and it can be, for example, 50 weeks or less, 30 weeks or less, 10 weeks or less, 7 weeks or less, or 5 weeks or less. Here, "reducing the generation of water droplets" means that the amount of water droplets generated is reduced compared to a solid cosmetic preparation in powder form of the same composition obtained by a conventional, general production method that does not use the production method of the present disclosure, but instead involves blending an oil component and any oily component into a powder component at the same time and then uniformly mixing them.

[0034] <Powder> There are no particular limitations on the powder used in the solid cosmetic product in powder form of the present disclosure, and for example, spherical or non-spherical powders commonly used in the art can be used. The powders can be used alone or in combination of two or more. The solid cosmetic product in powder form may contain only spherical powders, only non-spherical powders, or both spherical and non-spherical powders.

[0035] In some embodiments, the solid cosmetic product in powder form of the present disclosure includes a spherical powder. The size of the spherical powder is not particularly limited. For example, the average particle size of the spherical powder can be 0.01 μm or more, 0.05 μm or more, 0.1 μm or more, 0.5 μm or more, 1.0 μm or more, 3.0 μm or more, or 5.0 μm or more, and can be 50 μm or less, 30 μm or less, 20 μm or less, 15 μm or less, or 10 μm or less. The spherical powder can be used alone or in combination of two or more types, each having an average particle size within such range.

[0036] The average particle size can be defined as the average value of the diameter of the powder (particles) optically measured by dynamic light scattering, assuming that the powder has a spherical shape.

[0037] In some embodiments, the solid cosmetic preparation in powder form of the present disclosure comprises a non-spherical powder. Non-spherical powder refers to powder that does not fall under the category of spherical powders described above, and can be defined, for example, by its aspect ratio. The aspect ratio of the non-spherical powder can be 1.2 or more, 1.5 or more, 2.0 or more, 2.5 or more, 3.0 or more, 5.0 or more, 7.0 or more, 10 or more, 15 or more, 20 or more, 25 or more, or 30 or more, and can be 200 or less, 170 or less, 150 or less, 120 or less, 100 or less, 70 or less, or 50 or less. Powders having aspect ratios within these ranges can be used alone or in combination of two or more types of non-spherical powder.

[0038] The aspect ratio can be calculated, for example, by microscopic observation, by extracting any 10 or more (e.g., 100) powder particles, measuring the longitudinal (surface) length of each powder and the lateral (thickness) length of the powder, and dividing the longitudinal length by the lateral length (i.e., longitudinal length / lateral length). The powder with the longest longitudinal length is selected, and the powder with the shortest lateral length is selected. The aspect ratio can be the average value of the aspect ratios of any 10 or more (e.g., 100) powder particles.

[0039] The amount of powder blended is not particularly limited, and can be, for example, 30% by mass or more, 40% by mass or more, 50% by mass or more, 55% by mass or more, 60% by mass or more, 65% by mass or more, 70% by mass or more, 75% by mass or more, 80% by mass or more, or 85% by mass or more, relative to the total amount of the cosmetic, and can also be 95% by mass or less, 93% by mass or less, 90% by mass or less, 87% by mass or less, 85% by mass or less, 83% by mass or less, or 80% by mass or less. The powder can be blended into the cosmetic as appropriate within these ranges.

[0040] The type of powder is not particularly limited, and for example, inorganic powders and / or organic powders can be used. The inorganic powders and organic powders can be used alone or in combination of two or more kinds.

[0041] Examples of components constituting the inorganic powder include talc, kaolin, mica (e.g., sericite (sericite), muscovite, phlogopite, synthetic mica, synthetic iron phlogopite, lepidolite, and biotite), calcined talc, calcined mica (e.g., calcined sericite, calcined muscovite, and calcined phlogopite), vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, Ca / Al borosilicate, metal tungstate, magnesium, silica, alumina, zeolite, aluminum hydroxide, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soap (e.g., zinc myristate, calcium palmitate, and aluminum stearate), boron nitride, photochromic titanium oxide (titanium dioxide sintered with iron oxide), and reduced zinc white. Such powders may be blended as pigments other than the coloring pigments described below for the purpose of increasing or reinforcing the cosmetic composition. Powders used for such purposes are sometimes called extender pigments.

[0042] In addition, inorganic pigments (sometimes referred to as "inorganic colored pigments") can also be used as the inorganic powder. Examples of inorganic pigments include inorganic white pigments (e.g., titanium dioxide, zinc oxide); inorganic red pigments (e.g., iron oxide (red iron oxide), iron titanate); inorganic brown pigments (e.g., γ-iron oxide); inorganic yellow pigments (e.g., yellow iron oxide, ochre); inorganic black pigments (e.g., black iron oxide, low-order titanium oxide); inorganic purple pigments (e.g., mango violet, cobalt violet); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate); and inorganic blue pigments (e.g., ultramarine, Prussian blue). Other examples include glitter powders. Examples of such glittering powders include pearl pigments (e.g., bismuth oxychloride, fish scale foil, titanium mica, titanium iron oxide-coated titanium mica, titanium low-titanium oxide-coated titanium mica, photochromic titanium mica, substrates using talc, glass, synthetic fluorine-containing phlogopite, silica, bismuth oxychloride, or the like instead of mica, coatings other than titanium oxide such as low-titanium oxide, colored titanium oxide, iron oxide, alumina, silica, zirconia, zinc oxide, cobalt oxide, and aluminum, and functional pearl pigments such as pearl pigments coated with resin particles, pearl pigments coated with aluminum hydroxide particles, pearl pigments coated with zinc oxide particles, and pearl pigments coated with barium sulfate particles); and metal powder pigments (e.g., aluminum powder and copper powder).

[0043] Examples of components constituting the organic powder include silicone elastomer, silicone, silicone resin-coated silicone elastomer, polyamide resin (e.g., nylon), polyolefin resin (e.g., polyethylene), polymethyl methacrylate, polystyrene, styrene-acrylic acid copolymer resin, benzoguanamine resin, fluororesin (e.g., polytetrafluoroethylene), starch (e.g., starch Al octenyl succinate), crosspolymers such as (HDI / trimethylol hexyl lactone) crosspolymer, (diphenyl dimethicone / vinyl diphenyl dimethicone / silsesquioxane) crosspolymer, and (IPDI / poly(1,4-butanediol)-14) crosspolymer, and cellulose.

[0044] Other examples of organic powders that can be used include organic pigments (sometimes referred to as "organic coloring pigments") and / or dyes. Examples of organic pigments include zirconium, barium, and aluminum lakes, specifically, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 228, Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, and Blue No. 404, as well as Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230, Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Green No. 3, and Blue No. 1.

[0045] Examples of pigments include natural pigments, specifically, for example, chlorophyll and β-carotene.

[0046] The powder used in the solid cosmetic in powder form of the present disclosure may or may not be treated with a surface treatment agent. For example, when using a powder (hydrophobic powder) treated with a surface treatment agent such as carboxydecyltrisiloxane, dimethicone, silicone, myristic acid, stearic acid, dextrin palmitate, or an acrylic-silicone graft copolymer, the proportion of such treated powder to the total powder can be 100% or less, 80% or less, 50% or less, 30% or less, 15% or less, 10% or less, 5% or less, 1% or less, 0.5% or less, 0.1% or less, 0.05% or less, or 0.01% or less, or 0.01% or more, 0.1% or more, 1% or more, 5% or more, 10% or more, 20% or more, 30% or more, 40% or more, or 50% or more.

[0047] <Moisturizing Agent> There are no particular limitations on the moisturizing agent used in the solid cosmetic preparation in powder form according to the present disclosure. The moisturizing agent may be used alone or in combination of two or more kinds.

[0048] While conventional solid cosmetic powder preparations typically do not contain moisturizing agents, the solid cosmetic powder preparation of the present disclosure contains a moisturizing agent, which allows the solid cosmetic powder preparation to exhibit moisturizing properties, thereby improving the cosmetic effects of skin care and the like compared to conventional solid cosmetic powder preparations.

[0049] The blending amount of the humectant can be, for example, 1.0% by mass or more, 1.5% by mass or more, 2.0% by mass or more, 2.5% by mass or more, or 3.0% by mass or more relative to the total amount of the cosmetic, and can also be 20% by mass or less, 17% by mass or less, 15% by mass or less, 13% by mass or less, 10% by mass or less, 8.0% by mass or less, 7.0% by mass or less, or 5.0% by mass or less. The blending amount of the humectant can be appropriately set within these ranges depending on the required performance of the solid cosmetic in powder form, etc.

[0050] In the present disclosure, the term "humectant" may refer to a substance whose mass change rate is 0.2% or more, 1.0% or more, 3.0% or more, 5.0% or more, or 7.0% by mass or more, 30% or less, 25% or less, or 20% or less when 5 g of a moisturizer component is precisely weighed into a 20 ml screw tube and allowed to stand overnight at 37°C and a relative humidity of 98%.

[0051] Specific examples of moisturizing agents include glycerin, dihydric glycols, polyoxyethylene polyoxypropylene dimethyl ether, polyethylene glycol, diglycerin, xylitol, trehalose, erythritol, hyaluronic acid, and urea. Among these, glycerin and dihydric glycols are preferred from the viewpoints of fine dispersion in oil, the associated effect of reducing water droplet generation, and ease of use. Examples of dihydric glycols include 1,3-butylene glycol and dipropylene glycol. Here, the term "dihydric glycol" in the present disclosure does not include polyethylene glycol.

[0052] In some embodiments, the moisturizer in the cosmetic is dispersed in the oil in a particulate form (sometimes referred to as "moisturizer particles"), as shown in Figures 1 and 2. The average particle size of the moisturizer dispersed in the oil is preferably 100 μm or less, 80 μm or less, 50 μm or less, 30 μm or less, or 20 μm or less, from the viewpoints of fine dispersibility in the oil, the associated effect of reducing water droplet generation, moisturizing effect, and usability. The lower limit of this average particle size can be, for example, 1 μm or more, 2 μm or more, 3 μm or more, 4 μm or more, or 5 μm or more. Of these, the average particle size is preferably in the range of 2 to 50 μm. The average particle size of such a moisturizer can be defined as the average value of the diameters of the projected area circles of 10 or more, preferably 100 or more, moisturizer particles observed with an optical microscope. The average particle size of the moisturizer can also be appropriately adjusted, for example, by the mixing conditions (e.g., stirring speed, stirring time) used when preparing the oil phase part.

[0053] <Oil> There are no particular limitations on the oil used in the solid cosmetic preparation in powder form according to the present disclosure. The oil may be used alone or in combination of two or more types.

[0054] The amount of oil blended is not particularly limited, and can be, for example, 5.0% by mass or more, 10% by mass or more, 20% by mass or more, 30% by mass or more, 40% by mass or more, 50% by mass or more, or 60% by mass or more relative to the total amount of the cosmetic, and can also be 95% by mass or less, 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, 50% by mass or less, 40% by mass or less, less than 33% by mass, 30% by mass or less, or 25% by mass or less. The oil can be used appropriately within these ranges.

[0055] Specific examples of oils include hydrocarbon oils (especially non-polar hydrocarbon oils), liquid oils and fats, solid oils and fats, waxes, silicone oils, and polar oils (e.g., synthetic ester oils). Among these, from the viewpoints of the fine dispersion of the moisturizer in the oil, the associated effect of reducing water droplet generation, moisturizing effect, and usability, hydrocarbon oils (especially non-polar hydrocarbon oils) and silicone oils are preferred, and hydrocarbon oils (especially non-polar hydrocarbon oils) are more preferred. In some embodiments, for example, when an oil that is solid at room temperature (e.g., 25°C) is used, the finely dispersed moisturizer particles can be fixed in the oil in the final cosmetic product, resulting in a more stable powder solid cosmetic product. Therefore, it is also preferable to use an oil that is solid at room temperature (e.g., 25°C).

[0056] Examples of hydrocarbon oils include petrolatum, liquid paraffin, tetraisobutane, hydrogenated polydecene, microcrystalline wax, olefin oligomer, isododecane, isohexadecane, squalane, polybutene, hydrogenated polybutene, polyisobutene, and hydrogenated polyisobutene. These hydrocarbon oils may also be non-polar hydrocarbon oils.

[0057] Examples of liquid oils and fats include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, camellia oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, and triglycerin.

[0058] Examples of solid fats and oils include cocoa butter, coconut oil, horse fat, hardened coconut oil, palm oil, beef tallow, mutton tallow, hardened beef tallow, palm kernel oil, lard, beef bone fat, Japan wax kernel oil, hardened oil, beef foot fat, Japan wax, and hardened castor oil.

[0059] Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, privet wax, spermaceti, montan wax, rice bran wax, lanolin, kapok wax, acetated lanolin, liquid lanolin, sugarcane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.

[0060] Examples of silicone oils include chain silicones such as dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane, and methylhydrogenpolysiloxane; and cyclic silicones such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

[0061] Examples of synthetic ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, and pentaerythritol tetra-2-ethylhexanoate. Glyceryl tri-2-ethylhexanoate, glyceryl trioctanoate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptyl palmitate lauroyl-L-glutamic acid 2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate.

[0062] Such synthetic ester oils fall under the category of polar oils. Polar oils and non-polar oils can be distinguished by their IOB value. The IOB value of polar oils can be, for example, 0.10 or more, 0.11 or more, 0.12 or more, or 0.13 or more, and can be 0.50 or less, 0.45 or less, or 0.40 or less. Here, the IOB value is an abbreviation for Inorganic / Organic Balance (inorganic / organic ratio), and is a value representing the ratio of inorganic value to organic value, serving as an index indicating the degree of polarity of an organic compound. Specifically, the IOB value is expressed as IOB value = inorganic value / organic value. The "inorganic value" and "organic value" are set according to the type of atom or functional group, such as 20 for one carbon atom in a molecule and 100 for one hydroxyl group. The IOB value of an organic compound can be calculated by integrating the "inorganic values" and "organic values" of all atoms and functional groups in the organic compound (see, for example, "Organic Conceptual Diagram - Fundamentals and Applications" by Yoshio Koda, pp. 11-17, Sankyo Publishing, 1984).

[0063] In some embodiments, the solid cosmetic in powder form according to the present disclosure may contain silicone oil in an amount of less than 30% by mass, less than 20% by mass, less than 10% by mass, 5.0% by mass or less, 1% by mass or less, or 0.5% by mass or less, relative to the total amount of the cosmetic. There is no particular lower limit to the amount, and the amount may be 0% by mass or more or greater than 0% by mass.

[0064] <Optional Components> The solid cosmetic powder preparation of the present disclosure may contain various components as appropriate, provided that they do not adversely affect the effects of the present disclosure. Examples of such optional components include components other than those described above that are used in cosmetics, pharmaceuticals, etc. Specific examples include surfactants, water-soluble polymers, oil-soluble polymers, thickeners, film-forming agents, UV absorbers, anti-fading agents, sequestering agents, preservatives, polymer emulsions, pH adjusters, deodorants, disinfectants, antioxidants, antioxidant aids, excipients, fragrances, extracts (e.g., camellia seed extract), and coloring materials (e.g., pigments, colorings, and dyes other than those described above). The optional components may be used alone or in combination. Some of the optional components are described in detail below.

[0065] (Thickener) From the viewpoints of the fine dispersibility of the humectant in the oil, the associated effect of reducing the generation of water droplets, the moisturizing effect, and ease of use, the use of a thickener is advantageous, and it is preferable to incorporate it during the preparation of the oil phase part. Examples of thickeners include dextrin fatty acid esters, sucrose fatty acid esters, glyceryl fatty acid esters, amino acid gelling agents, fatty acids or salts thereof, and organically modified clay minerals. Among these, from the viewpoints of the fine dispersibility of the humectant in the oil, the associated effect of reducing the generation of water droplets, the moisturizing effect, and ease of use, fatty acids or salts thereof, and organically modified clay minerals are preferred, 12-hydroxystearic acid or salts thereof, and disteardimonium hectorite are more preferred, and disteardimonium hectorite is particularly preferred. The thickeners can be used alone or in combination of two or more.

[0066] a. Dextrin fatty acid esters Dextrin fatty acid esters are esters of dextrin or reduced dextrin with higher fatty acids. The dextrin or reduced dextrin may have an average degree of glycopolymerization of 3 to 100. The fatty acid constituting the dextrin fatty acid ester may be a saturated fatty acid having 8 to 22 carbon atoms. Specific examples of such fatty acids include dextrin palmitate, dextrin oleate, dextrin stearate, dextrin myristate, and dextrin (palmitate / 2-ethylhexanoate).

[0067] Sucrose fatty acid esters can be used in which the fatty acids are linear or branched, saturated or unsaturated, and have 12 to 22 carbon atoms. Specific examples of sucrose fatty acid esters include sucrose caprylate, sucrose caprate, sucrose laurate, sucrose myristate, sucrose palmitate, sucrose stearate, sucrose oleate, and sucrose erucate.

[0068] Glyceryl fatty acid esters are esterification reaction products obtained by reacting glycerin, a dibasic acid having 18 to 28 carbon atoms, and a fatty acid having 8 to 28 carbon atoms (excluding dibasic acids). Specific examples of glyceryl fatty acid esters include glyceryl (behenate / isostearate / eicosadioate), glyceryl (behenate / eicosadioate), and polyglyceryl-10 (behenate / eicosadioate).

[0069] d. Amino Acid Gelling Agents Examples of amino acid gelling agents include dibutyl lauroyl glutamide, dibutyl ethyl hexanoyl glutamide, polyamide-8, and polyamide-3.

[0070] e. Fatty Acids or Salts Thereof Fatty acids that are solid at room temperature can be used, and examples thereof include myristic acid, palmitic acid, stearic acid, behenic acid, and 12-hydroxystearic acid. Salts of fatty acids can include calcium salts, magnesium salts, and aluminum salts. Here, in the present disclosure, "room temperature" refers to a temperature range of 15°C to 25°C.

[0071] f. Organically modified clay minerals Examples of organically modified clay minerals include water-swellable clay minerals treated with quaternary ammonium salts. Specific examples of organically modified clay minerals include disteardimonium hectorite, dimethyldistearylammonium chloride-modified bentonite, dimethyldistearylammonium hectorite, dimethylalkylammonium hectorite, benzyldimethylstearylammonium hectorite, and distearyldimethylammonium chloride-treated magnesium aluminum silicate.

[0072] The amount of thickener blended is not particularly limited, and can be, for example, 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.7% by mass or more, 1.0% by mass or more, or 1.3% by mass or more relative to the total amount of the cosmetic, and can also be 5.0% by mass or less, 4.5% by mass or less, 4.0% by mass or less, 3.5% by mass or less, 3.0% by mass or less, 2.5% by mass or less, or 2.0% by mass or less. The thickener can be used appropriately within these ranges.

[0073] (Surfactant) There is no particular limitation on the surfactant, and ionic surfactants (for example, anionic surfactants, cationic surfactants, amphoteric surfactants) and nonionic surfactants can be used.Among them, nonionic surfactants are preferred, and silicone surfactants are more preferred, from the viewpoint of the fine dispersion of the moisturizing agent in oil, the associated effect of reducing water droplet generation, moisturizing effect, and usability.The surfactant is preferably blended when preparing the oil phase part.Furthermore, the surfactants can be used alone or in combination of two or more.

[0074] As the silicone surfactant, for example, a silicone surfactant modified with a polyether group or a polyglycerin group can be used.

[0075] Examples of silicone surfactants modified with a polyether group include PEG-11 methyl ether dimethicone, PEG-10 dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, lauryl PEG-9 polydimethylsiloxyethyl dimethicone, and cetyl PEG / PPG-10 / 1 dimethicone.

[0076] Examples of silicone surfactants modified with a polyglycerin group include polyglyceryl-3 disiloxane dimethicone, polyglyceryl-3 polydimethylsiloxyethyl dimethicone, and lauryl polyglyceryl-3 polydimethylsiloxyethyl dimethicone.

[0077] The amount of surfactant to be added is not particularly limited, and can be, for example, 0.1% by mass or more, 0.5% by mass or more, or 1.0% by mass or more relative to the total amount of the cosmetic, and can be 8.0% by mass or less, 6.0% by mass or less, or 5.0% by mass or less.

[0078] Uses of the solid cosmetic powder according to the present disclosure are not particularly limited. Examples of uses include foundation (e.g., powdery foundation), eye shadow, blush, body powder, perfume powder, baby powder, deodorant powder, and face powder.

[0079] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, the blending amounts are expressed in mass %. Furthermore, the various evaluation methods described in the examples are not limited to the cosmetic preparations described in the examples, and can be similarly performed on cosmetic preparations containing the above-mentioned components.

[0080] Example 1 and Comparative Examples 1 to 3 The solid cosmetic powder preparations obtained by the formulations shown in Table 1 and the manufacturing methods described below were evaluated as follows, and the results are shown in Tables 2 and 3. Here, this solid cosmetic powder preparation corresponds to a pressed powder type blush.

[0081] <Evaluation Method> <Appearance Evaluation Test: Occurrence of Water Droplets> A panel of five experts conducted a comprehensive evaluation of the appearance of the cosmetics. The evaluation method consisted of leaving the prepared cosmetics for four weeks in environments of 37°C and relative humidity of 90% RH and 95% RH, and then evaluating the presence or absence of water droplets on the surface of the cosmetics according to the following criteria: A: No water droplets were observed. B: Slight water droplets were observed. C: Water droplets were clearly observed.

[0082] (Usability test: moist feeling) A comprehensive evaluation of usability was carried out by a panel of five experts. The evaluation method was to take a cosmetic product with a foundation puff and apply it to the face, and evaluate the usability, i.e., whether a moist feeling was obtained rather than a dry feeling, according to the following criteria: A: Moist feeling was felt. B: Slight moist feeling was felt. C: No moist feeling was felt.

[0083] <Method for producing solid cosmetic powder: wet molding method> Table 1 shows the formulation of the solid cosmetic powder.

[0084]

[0085] (Example 1: Fine dispersion of humectant) The components of the oil phase part listed in Table 1 other than the humectant were heated to 90 to 95°C and stirred at 6,000 rpm using a homogenizer for 5 minutes to obtain mixture A. Next, while heating and stirring under the same conditions, the humectant listed in Table 1 was added to the obtained mixture A and stirred for an additional 5 minutes to prepare an oil phase part, which was a dispersion in which the humectant was dispersed in oil. The humectant in the dispersion was in particulate form, with particle sizes ranging from about 2 μm to about 50 μm, and the average particle size was about 26 μm.

[0086] The predetermined amounts of the powder part and the obtained oil phase part shown in Table 1 were mixed in a Henschel mixer while heating to prepare Mixture B. Dimethicone, an oily dispersion medium, was added to Mixture B, and the mixture was stirred to prepare a slurry solution. The obtained slurry solution was filled into a roughly square (approximately 3 cm x approximately 4 cm) resin dish with a depth of approximately 5 mm, after which the dimethicone was removed and the mixture was dried to obtain the powder solid cosmetic of Example 1. The oil phase part of Example 1 had a melt viscosity of approximately 100,000 mPa s or more at 80°C.

[0087] (Comparative Example 1: Simultaneous addition of moisturizer and oil) The specified amounts of powder part and oil phase part shown in Table 1 were mixed in a Henschel mixer while heating to prepare a mixture. Dimethicone, an oily dispersion medium, was added to this mixture, and the mixture was stirred to prepare a slurry solution. The obtained slurry solution was filled into a roughly square (approximately 3 cm x approximately 4 cm) resin dish container with a depth of approximately 5 mm, after which the dimethicone was removed and the container was dried to obtain a powder solid cosmetic product of Comparative Example 1.

[0088] (Comparative Example 2: First addition of moisturizer) A predetermined amount of powder part shown in Table 1 was mixed with a moisturizer shown in Table 1 in a Henschel mixer while heating, and then the remaining oil phase part shown in Table 1 was mixed with the Henschel mixer while heating to prepare a mixture. Dimethicone, an oily dispersion medium, was added to this mixture and stirred to prepare a slurry solution. The obtained slurry solution was filled into a roughly square (approximately 3 cm x approximately 4 cm) resin dish container with a depth of approximately 5 mm, after which the dimethicone was removed and the container was dried to obtain a powder solid cosmetic product of Comparative Example 2.

[0089] (Comparative Example 3: Late Addition of Moisturizing Agent) A mixture was prepared by mixing the predetermined amounts of powder parts and oil phase parts other than the moisturizing agent in a Henschel mixer while heating, as shown in Table 1. To this mixture, dimethicone as an oily dispersion medium and the moisturizing agent were added, and the mixture was stirred to prepare a slurry solution. The obtained slurry solution was filled into a roughly square (approximately 3 cm x approximately 4 cm) resin dish container with a depth of approximately 5 mm, after which the dimethicone was removed and the container was dried, yielding a powder solid cosmetic product of Comparative Example 3.

[0090]

[0091]

[0092] <Results> As is clear from the results in Tables 2 and 3, the powder solid cosmetic preparation of Example 1, which was prepared by dispersing a moisturizer in oil, was found to have better results in appearance evaluation and usability than cosmetics prepared by other methods.

Claims

1. A method for producing a powder solid cosmetic product, comprising: preparing an oil phase part containing a moisturizer and an oil, wherein the components constituting the oil phase part are mixed to form a dispersion in which the moisturizer is dispersed in the oil; and mixing the oil phase part and a powder to form a mixture.

2. The manufacturing method according to claim 1, wherein the moisturizing agent comprises at least one selected from the group consisting of glycerin and dihydric glycols.

3. The manufacturing method according to claim 1 or 2, wherein the content of the moisturizing agent is 1.0 mass% or more relative to the total amount of the cosmetic.

4. The manufacturing method according to claim 1 or 2, wherein the oil phase part has a viscosity of 17,000 mPa·s or more at 80°C.

5. The manufacturing method according to claim 1 or 2, wherein the average particle size of the moisturizing agent dispersed in the oil is 100 μm or less.

6. The manufacturing method according to claim 1 or 2, wherein the manufacturing method is a dry molding method.

7. The method of claim 1 or 2, wherein the method is a wet molding method and includes blending the mixture in an oily dispersion medium to form a slurry.

8. The method of claim 7, wherein the oily dispersion medium contains at least one selected from the group consisting of silicone oil and hydrocarbon oil.

9. A powder solid cosmetic comprising a powder, a moisturizer, and an oil, the moisturizer being dispersed in the oil.

10. The cosmetic preparation according to claim 9, wherein the moisturizing agent comprises at least one selected from the group consisting of glycerin and dihydric glycols.

11. The cosmetic according to claim 9 or 10, wherein the content of the moisturizing agent is 1.0 mass% or more relative to the total amount of the cosmetic.

12. The cosmetic preparation according to claim 9 or 10, wherein the oil component comprises at least one oil selected from the group consisting of silicone oil and hydrocarbon oil.

13. The cosmetic preparation according to claim 9 or 10, wherein the moisturizing agent dispersed in the oil has an average particle size of 100 μm or less.

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