Oil-based powder foundation

Abstract

To provide an oily powder foundation that has high coverage and provides a natural finish due to take advantage of powder foundation and oily foundation to solve their problems.SOLUTION: Provided is an oily powder foundation containing (a) spherical particles, (b) titanium dioxide, (c) a film former, (d) a volatile oil, and (e) a surfactant. As the component (a), urethane powder, acrylic powder, nylon powder, silicone powder, cellulose powder, silica powder, or calcium carbonate powder with an average particle size of 5 to 20 μm is used, the total amount of the components (a) and (b) being 35 to 55 mass%, and a mass ratio of the components (a) and (b) being adjusted to 1 to 1.5:1.5 to 1.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an oil-based powder foundation that has good elongation, which is an advantage of oil-based products, and changes to a powdery feel instantly upon application. Specifically, it relates to a novel oil-based powder foundation that can correct pores and unevenness on the skin and has the finish and feel of conventional powder foundations.

Background Art

[0002] In recent years, foundations, with solid powder foundations at the forefront, solid oil-based foundations (compact, stick types) have become mainstream. Furthermore, liquid foundations, cream foundations, and emulsified liquid foundations and emulsified cream foundations, which are derived from solid oil-based foundations and contain water or polyhydric alcohols, have been developed.

[0003] Powder foundations are generally composed of about 85 - 90% by mass of powder and 10 - 15% by mass of oil. They have the drawback of being powdery in finish and having a large amount of makeup smudging due to sebum, and the use of base cosmetics is an essential condition. Especially in winter, they have a powdery finish. On the other hand, oil-based foundations are composed of 40 - 45% by mass of powder and 55 - 60% by mass of oil and wax. The feel of the finish is oily, and their use is avoided in hot summers. Generally, they are autumn and winter-specification foundations.

[0004] Foundations that claim a powdery feel while being oil-based have also been launched. These are stick oil-based foundations with a powdery feel that use cyclohexasiloxane as a volatile oil and contain low-viscosity oils such as phenyltrimethicone and isohexadecane. However, they do not contain a film-forming agent, and makeup smudging occurs due to sweat, sebum, etc. caused by heat as described above. At the same time, the effect of diffusing and reflecting light hitting the skin to correct pores and unevenness is significantly reduced. There is a need to prevent this drawback, that is, for the finish immediately after makeup to last, but there is no product that combines this function. Liquid foundations, cream foundations, emulsified liquid foundations, and emulsified cream foundations all closely resemble the finish of oil-based foundations, having an oily feel and completely lacking the powdery feel of commercially available powder foundations.

[0005] Given this background, there is a demand for a foundation that possesses the oily characteristic of easy spreadability, does not require the use of a primer, instantly transforms into a powdery texture after application, is non-greasy, and can be used throughout all seasons. Of course, the ability to beautifully correct pores and unevenness of the skin is a characteristic that a foundation should naturally have, and maintaining this function is also a requirement, as mentioned above. Foundations generally utilize the soft-focus function of spherical particles (a blurring effect that makes pores and other imperfections less noticeable) and the concealing function of titanium dioxide to correct pores and unevenness in the skin, and are expected to provide a natural finish. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 3664246 [Patent Document 2] Patent No. 6112863 [Patent Document 3] Patent No. 4606187 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Patent Document 1 discloses a gel-type oil-based foundation that is excellent at correcting unevenness on the skin surface and concealing pores. This foundation is formulated with plate-like powders having a particle size of 1 to 12 μm and an average particle size of 5 to 6 μm, and spherical powders having a particle size of 4 to 10 μm, with a mass ratio of 1:1 to 1:4 for plate-like powders and a spherical powder content of 7 to 11% by mass. However, this gel-type oil-based foundation does not have the function of instantly changing to a powdery feel upon application and cannot eliminate the oiliness after application.

[0008] Patent Document 2 discloses an oily solid cosmetic composition containing 40-60% by mass of titanium dioxide powder based on the total amount of the cosmetic composition (however, the content of spherical powder is 0-10% by mass based on the total amount of powder), a film-forming agent, a volatile oil, and 2-12% by mass of an ester oil with a molecular weight of 500-1000 and an IOB value of 0.2 or less. However, the spherical powder accounts for 0-10% by mass of the total amount of powder, which even at the maximum amount, only amounts to 6% by mass of the total amount of the cosmetic composition, resulting in a finish and feel that is far from powdery.

[0009] Patent Document 3 discloses a cosmetic composition for concealing skin furrows, comprising 10-70% by mass of spherical particles, 20-80% by mass of an oil, and powders other than spherical particles. However, when the amount of spherical particles is 20% by mass or less and the oil is 20% by mass or more, this cosmetic composition can achieve features such as uniformity of the cosmetic film, a smooth feel, and reduced visibility of skin furrows, but because it does not contain a film-forming agent, it becomes difficult to fix the powder on the skin, including the skin furrows, resulting in an oily feel and finish. On the other hand, when the amount of spherical particles is close to 70% by mass, there is a problem of increased makeup breakdown due to sebum.

[0010] The present invention aims to provide an oil-based powder foundation that leverages the advantages of both conventional powder foundations and oil-based foundations while addressing the problems associated with each, resulting in a powdery texture upon application, no oiliness, high opacity, and a natural finish. [Means for solving the problem]

[0011] As a result of diligent research to solve the above problems, the inventors have discovered that an oil-based powder foundation containing (a) spherical particles, (b) titanium dioxide, (c) a film-forming agent, (d) a volatile oil agent, and (e) a surfactant is a groundbreaking oil-based powder foundation that possesses the excellent spreadability characteristic of oil-based foundations, instantly transforms into the feel and finish of a powder foundation, allows for easy makeup application without the need for primer, and can be used all year round, thus leading to the present invention.

[0012] In other words, the present invention comprises the following components (a) to (e); (a) Spherical particles, (b) Titanium dioxide, (c) Film-forming agent, (d) Volatile oils, (e) Surfactants, We provide an oil-based powder foundation containing [the specified ingredient]. [Effects of the Invention]

[0013] The oil-based powder foundation of this invention has the same effect as powder foundations and oil-based foundations in covering pores and unevenness on the skin surface. Moreover, unlike powder foundations, it does not have a powdery finish and is not prone to significant makeup breakdown due to sebum. Furthermore, there is no need to use a primer to prevent makeup breakdown due to sweat and sebum. Of course, since it changes to a powdery texture the moment it is applied, it does not have the oiliness of oil-based foundations, making it suitable for use in summer. [Modes for carrying out the invention]

[0014] The spherical particles of component (a) used in this invention preferably have a volume-average particle diameter of 5 to 20 μm, more preferably 7 to 18 μm, and even more preferably 12 to 18 μm, from the viewpoint of usability, finish, and soft-focus effect. The spherical particles of component (a) can be used individually or in combination of two or more types. Here, the volume-average particle diameter is measured using a laser diffraction scattering particle size distribution analyzer. In this invention, the volume-average particle diameter is the average particle diameter based on volume, and is defined as the 50% median diameter.

[0015] The material of the spherical particles should be selected from the viewpoint of dispersibility in the formulation, i.e., the wettability of the powder, and ease of use. Examples of spherical particles that can be used include urethane powder, acrylic powder, nylon powder, silicone powder, cellulose powder, silica powder, and calcium carbonate powder. From the viewpoint of providing a soft feel, organic polymer particles such as urethane powder, acrylic powder, nylon powder, and silicone powder are preferred, and from the viewpoint of ease of use, urethane powder is more preferred.

[0016] Commercially available spherical particles can be used. Examples of urethane powders include TP Powder D-400 and D-800 (both manufactured by Toshiki Pigment Co., Ltd.), and Dymic Beads CM-1077 and CM-1157 (both manufactured by Dainichi Seika Kogyo Co., Ltd.), which are perfectly spherical crosslinked urethane powders. Examples of acrylic powders include microparticles of polyalkyl methacrylate, such as Microsphere M (spherical with fine surface irregularities, polymethyl methacrylate), Microsphere M-100 (spherical with smooth surface, polymethyl methacrylate), and Microsphere M-306 (spherical with smooth surface, methyl methacrylate crosspolymer) (all manufactured by Matsumoto Oil & Fat Pharmaceutical Co., Ltd.). Examples of nylon powders include perfectly spherical nylon microparticles such as SP-500 and SP-10 (both manufactured by Toray Industries, Inc.). Examples of silicone powders include silicone composite powders in which a silicone resin or silicone rubber surface is coated with silicone resin, such as KMP-591, KSP-100, KSP-101, KSP-411, and KSP-441 (all manufactured by Shin-Etsu Chemical Co., Ltd.). Examples of the cellulose powder include CELLULOBEADS D-10, CELLULOBEADS D-5 (manufactured by Daito Kasei Kogyo Co., Ltd.), GE-800 (manufactured by Toshiba Pigment Co., Ltd.), and the like. Examples of the silica powder include silica beads SB-700 (manufactured by Miyoshi Kasei Co., Ltd.), and the like. Examples of the calcium carbonate powder include Karumaru SCS-M5 (manufactured by Sakai Chemical Industry Co., Ltd.), NL-QC10 (manufactured by New Lime Co., Ltd.), and the like.

[0017] From the viewpoint of lubricity, spherical particles of component (a) are preferably true spherical particles. True spherical means a structure having no numerous small voids inside or on the surface of the powder.

[0018] The titanium dioxide of component (b) used in the present invention is not limited in shape and particle size, but from the viewpoint of excellent hiding power, the primary particle size is preferably 0.15 to 0.3 μm. The crystal form of titanium dioxide is preferably rutile type or anatase type. Examples of titanium dioxide include MP-100 (manufactured by Tayca Corporation), JR-800 (manufactured by Tayca Corporation), CR-50 (manufactured by Ishihara Sangyo Co., Ltd.), MT-500SA (manufactured by Tayca Corporation), ST455 (manufactured by Titanium Industry Co., Ltd.), and the like.

[0019] The total content of the spherical particles of component (a) and titanium dioxide of component (b) is preferably 35 to 55% by mass, and more preferably 40 to 52% by mass. The ratio (mass ratio) of component (a) to component (b) is preferably 1 to 1.5:1.5 to 1, more preferably 1 to 1.3:1.3 to 1, and still more preferably 1 to 1.2:1.2 to 1.

[0020] In the present invention, powders other than the spherical particles of component (a) and titanium dioxide of component (b) can be used in combination, and examples include the following. The difference in particle structure such as plate shape, needle shape, porousness, etc. is not specified, and inorganic powders, bright powders, composite powders, etc. may also be used. Examples include talc, mica, synthetic mica, iron-containing synthetic mica, kaolin, sericite, magnesium carbonate, aluminum silicate, magnesium silicate, zinc oxide, red iron oxide, yellow iron oxide, black iron oxide, black titanium oxide, cerium oxide, barium sulfate, ultramarine, amber, titanium mica, iron oxide titanium mica, muscovite, plate-like synthetic mica, phlogopite, red mica, biotite, lithium mica, plate-like anhydrous silicic acid, plate-like hydroxyapatite, bentonite, montmorillonite, hectorite, plate-like ceramic powder, plate-like alumina, plate-like boron nitride, plate-like iron oxide, titanium oxide-coated mica, titanium oxide-treated mica, bismuth oxychloride, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, fish scale foil, titanium oxide-coated colored mica, aluminum, plate-like glass powder, etc. Organic pigments may also be used.

[0021] Most powders used in this invention are preferably surface-treated from the viewpoint of wetting with oils and volatile oils. The surface treatment can be chemical or mechanochemical. Examples include silicone compound treatment, fluorine compound treatment, amino acid treatment, pendant treatment, silane coupling agent treatment, titanium coupling agent treatment, oil treatment, amino acid treatment, N-acylated amino acid treatment, fatty acid treatment, metal soap treatment, inorganic compound treatment, plasma treatment, plant-derived ester treatment, and mechanochemical treatment. Examples of silicone compounds include dimethylpolysiloxane, methylhydrogenpolysiloxane, trimethylsiloxysilicate, alkylalkoxysilane, alkyl-modified silicone, and acrylate silicone. Examples of fluorine compounds include perfluoropolyetheric acid, perfluoroalkyl phosphate, perfluoroalkyl phosphate ester, perfluoroalkylalkoxysilane, and fluorine-modified silicone. Examples of amino acids include lecithin. Examples of N-acylated amino acids include lauroyl lysine, dilauroyl glutamate lysine sodium, stearoyl glutamate disodium, and lauroyl aspartate sodium. Examples of fatty acids include stearic acid and myristic acid, while examples of metal soaps include zinc myristate. Examples of plant-derived esters include polyglyceryl-2 tetraisostearate. From the viewpoint of improving the spreadability of oil-based powder foundation, suppressing stickiness, and improving uniformity when makeup cosmetics are applied on top of the foundation, hydrophobic treatment is preferred as a surface treatment, and among the above treatments, silicone compound treatment and fluorine compound treatment are preferred. In particular, methylhydrogenpolysiloxane treatment, dimethylpolysiloxane treatment, alkylalkoxysilane treatment, and perfluoroalkylalkoxysilane treatment are preferred, and methylhydrogenpolysiloxane treatment and dimethylpolysiloxane treatment are more preferred. Hydrophobic treatment can be carried out by conventional methods.

[0022] The film-forming agent component (c) used in the present invention is a paste or solid at room temperature (25°C), is compatible with the volatile oil component (d), and has the property of forming a film as the volatile oil evaporates on the skin. The film-forming agent can be an oil-soluble silicone resin commonly used in cosmetics, such as fluorine-modified silicone resin, trimethylsiloxysilicate, or acrylic silicone resin. One or more compounds selected from these can be used in combination. In addition to oil-soluble silicone resins, other oil-soluble resins such as terpene resins, rosin resins, candelilla wax extract, sugar fatty acid esters such as dextrin isostearate, and modified starch can also be used. These compounds can be used individually or in combination of two or more, and may also be used in combination with oil-soluble silicone resins. Among film-forming agents, trimethylsiloxysilicate and dextrin isostearate are more preferred from the viewpoint of superior durability of cosmetic effect.

[0023] These fluorine-modified silicone resins, trimethylsiloxysilicate, and acrylic silicone resins are preferably used dissolved in a solvent from the viewpoint of uniform application during use. As the solvent, silicone oil is preferably used from the viewpoint of solubility in the film-forming agent, compatibility of component (d) with volatile solvents, and low skin irritation. As the silicone oil, one or more selected from methyl trimethicone, dimethylpolysiloxane (2cs), dimethylpolysiloxane (6cs), dimethylpolysiloxane (10cs), decamethylcyclopentasiloxane, and octamethylcyclotetrasiloxane are preferred, and one or more selected from methyl trimethicone, dimethylpolysiloxane (2cs), and decamethylcyclopentasiloxane are more preferably used.

[0024] Furthermore, when using acrylic silicone resin as a film-forming agent, hydrocarbons can also be used as solvents, with isododecane being preferred.

[0025] As the fluorine-modified silicone resin used as a film-forming agent, trifluoroalkyldimethyltrimethylsiloxysilicate is preferred, and commercially available products such as XS66-B8226 (50% by mass solids decamethylcyclopentasiloxane solution) and XS66-B8636 (50% by mass solids dimethylpolysiloxane (10 cs) solution) (both manufactured by Momentive Performance Materials) which have been pre-dissolved in a solvent can be used.

[0026] Commercially available trimethylsiloxysilicate products are those that have been pre-dissolved in a solvent, such as KF-7312T (60% by mass solids methyl trimethicone solution), KF-7312J (50% by mass solids decamethylcyclopentasiloxane solution), KF-7312K (60% by mass solids dimethylpolysiloxane (6cs) solution), KF-7312L (50% by mass solids dimethylpolysiloxane (2cs) solution), KF-9021 (50% by mass solids decamethylcyclopentasiloxane solution), and KF-9021L (50% by mass solids You can use solutions such as % dimethylpolysiloxane (2cs) solution, X21-5249 (50% by mass decamethylcyclopentasiloxane solution), X21-5595 (60% by mass isododecane solution) (all manufactured by Shin-Etsu Chemical Co., Ltd.), SS4267 (35% by mass dimethylpolysiloxane solution), SR1000 (all manufactured by Momentive Performance Materials Japan LLC), BY11-018 (30% by mass decamethylcyclopentasiloxane solution) (manufactured by Dow Toray Industries, Inc.), BELSIL TMS 803 (manufactured by Wacker Chemie AG), etc.

[0027] Commercially available acrylic silicone resins include those that have been pre-dissolved in a solvent, such as FA 40. Products such as 01CM (30% by mass decamethylcyclopentasiloxane solution), FA 4002ID (40% by mass isododecane solution) (both manufactured by Dow-Toray Industries, Inc.), KP-545 (30% by mass decamethylcyclopentasiloxane solution), KP-550 (40% by mass isododecane solution), and KP-545L (40% by mass dimethylpolysiloxane (2cs) solution) (all manufactured by Shin-Etsu Chemical Co., Ltd.) can be used.

[0028] The film-forming agent content is preferably 3 to 30% by mass as solid content, more preferably 4 to 20% by mass, and even more preferably 5 to 10% by mass. When the solid content is in the range of 3 to 30% by mass, spherical particles are arranged on the finished skin surface, causing light to scatter and resulting in a matte, powdery finish. In addition, the film-forming agent improves sebum resistance and water resistance, and the spherical particles are fixed in pores and unevenness, eliminating makeup breakdown. As a result, it becomes an oil-based powder foundation that has the spreadability of an oil-based foundation but transforms into a powdery finish the moment it is applied.

[0029] The volatile oil agent of component (d) used in the present invention is not particularly limited as long as it is volatile at room temperature (25°C) and atmospheric pressure (1 atm) and is commonly used in cosmetics, such as hydrocarbon oils, silicone oils, and ether oils. The volatile oil agent of component (d) preferably has a boiling point of 150°C or higher. It is preferable to use one or more components from the viewpoint of the solubility of component (c) in film-forming agents, the dispersibility of component (a) in spherical particles and component (b) in titanium dioxide, usability, skin irritation, and odor.

[0030] Examples of hydrocarbon oils include hydrocarbons such as isododecane, isotridecane, and isohexadecane.

[0031] Examples of silicone oils include volatile silicone oils such as linear polysiloxanes like dimethylpolysiloxane, methyl trimethicone, caprylyl methicone, and ethyl trisiloxane, and cyclic polysiloxanes like octamethylcyclotetrasiloxane (abbreviated as D4), decamethylcyclopentasiloxane (abbreviated as D5), and dodecamethylcyclohexasiloxane (abbreviated as D6). The linear polysiloxanes may be linear or branched.

[0032] Examples of ether oils include fluorine-containing ether oils such as ethyl perfluorobutyl ether.

[0033] From the viewpoint of suppressing stickiness, it is preferable that the volatile oil agent contains at least silicone oil, and it is preferable that the silicone oil is contained in the volatile oil agent at a concentration of 80% by mass or more, and more preferably at a concentration of 90% by mass or more.

[0034] Furthermore, volatile oils include those used as solvents in commercially available trimethylsiloxysilicate solutions and other products used as film-forming agents for component (c).

[0035] The content of the volatile oil in component (d) is preferably 5 to 50% by mass, more preferably 10 to 40% by mass, and even more preferably 15 to 35% by mass, in total, from the viewpoint of obtaining an oil-based powder foundation that spreads easily during use and provides a beautiful finish.

[0036] The surfactant of component (e) is preferably one or more nonionic surfactants with an HLB of 10 or less, and more preferably a nonionic surfactant with an HLB of 6 or less, from the viewpoint of improving the wetting of the spherical particles of component (a), titanium dioxide and other powders of component (b) into a medium such as a volatile oil, and improving their dispersibility. Here, HLB (Hydrophilic-Lypophilic Balance) This is determined by Griffin's formula. (Two or more nonionic interfaces) When surfactants are used, the HLB value of each nonionic surfactant can be calculated by weighted average based on their respective blending ratios.

[0037] Examples of nonionic surfactants with an HLB of 10 or less include sorbitan esters such as sorbitan monoisostearate, sorbitan monooleate, sorbitan sesquiisostearate, and sorbitan sesquioleate; diglyceryl esters such as diglyceryl monoisostearate and diglyceryl monooleate; sucrose fatty acid esters; polyoxyethylene alkyl ethers; and polyoxyethylene hydrogenated castor oil. Alternatively, a nonionic surfactant selected from modified silicones can be used. Examples of modified silicones include those with straight, branched, or cross-linked silicone chains, such as polyether-modified silicones, polyether-alkyl-comodified silicones, polyglycerin-modified silicones, and polyglycerin-alkyl-comodified silicones.

[0038] The surfactant of component (e) can be one or more types, and its content is preferably 0.1 to 10% by mass, and more preferably 0.5 to 5% by mass, from the viewpoint of powder dispersibility and usability.

[0039] According to the present invention, by further incorporating wax as component (f), a solid-type oil-based powder foundation can be provided. Furthermore, by omitting the wax, a liquid-type oil-based powder foundation or a cream-type oil-based powder foundation can be provided.

[0040] When incorporating ingredient (f) wax, examples of waxes include natural waxes such as carnauba wax, candelilla wax, beeswax, Japanese wax, and rice bran wax; mineral waxes such as polyethylene wax, paraffin wax, microcrystalline wax, ceresin, and silicone wax; saturated fatty acids such as myristic acid, palmitic acid, stearic acid, arachidic acid, and behenic acid; higher fatty acid esters such as cetyl palmitate; and higher alcohols such as cetanol, stearyl alcohol, and behenyl alcohol. The amount of wax in component (f) is preferably 0.1 to 10% by mass, more preferably 1 to 8% by mass, and even more preferably 2 to 6% by mass, from the viewpoint of the hardness of the solid-type oil-based powder foundation, ease of application, and stability of the formulation.

[0041] The oil-based powder foundation of the present invention may optionally contain organically modified bentonite as an ingredient (g). It is particularly used to impart appropriate viscosity to liquid and cream-type foundations. The organically modified bentonite component (g) can be one or more types, and its content is 0 to 10% by mass of the total composition, preferably 1 to 8% by mass, and more preferably 2 to 6% by mass, from the viewpoint of usability and viscosity imparting.

[0042] Organically modified bentonite is a type of colloidal hydrated aluminum silicate with a three-layer structure, typically obtained by modifying clay minerals with quaternary ammonium salt-type cationic surfactants. Specific examples include dimethyldistearylammonium hectorite (disteardimonium hectorite), dimethylalkylammonium hectorite, benzyldimethylstearylammonium hectorite, and magnesium aluminum silicate treated with distearyldimethylammonium chloride. Commercially available products such as Benton 27 (benzyldimethylstearylammonium chloride-treated hectorite: manufactured by Elementis Japan) and Benton 38 (distearyldimethylammonium chloride-treated hectorite: manufactured by Elementis Japan) are preferred.

[0043] In the oil-based powder foundation composition of the present invention containing the above-mentioned components (a) to (g), it is preferable that water is not included. In the oil-based powder foundation composition of the present invention, at least one selected from water and polyhydric alcohol may be further incorporated as component (h). By doing so, a W / O emulsion-type oil-based powder foundation containing skincare-compatible ingredients insoluble in oil media can be obtained. The respective contents of water and polyhydric alcohol are not limited, but it is appropriate for water to be 1 to 30% by mass and polyhydric alcohol to be 0.1 to 10% by mass in the total composition.

[0044] In addition to the above components (a) to (h), the oil-based powder foundation of the present invention may contain various additives commonly used in cosmetics, such as preservatives, UV absorbers, UV scatterers, oils, thickeners, humectants, antioxidants, chelating agents, neutralizing agents, pH adjusters, insect repellents, physiologically active ingredients, fluorine compounds, fragrances, salts, and other components, as long as they do not interfere with the effects of the present invention.

[0045] Preservatives such as methylparaben, ethylparaben, and sodium dehydroacetate can be used. Examples include Mekkins M and Mekkins E manufactured by Ueno Pharmaceutical Co., Ltd., and Geogard 111S manufactured by Lonza Japan Co., Ltd.

[0046] As UV absorbers, Parsol MCX and Parsol 1789 (manufactured by DSM Corporation) can be used, while as UV scattering agents, ultrafine titanium dioxide particles such as MT-100TV, MTY-02 (manufactured by Teika Corporation), STR-100A-LP, STR-100C-LP, and STR-100W-LP (manufactured by Sakai Chemical Industry Co., Ltd.), or fine zinc oxide particles such as FINEX-50 and NANOFINE-50LP (manufactured by Sakai Chemical Industry Co., Ltd.) can be used. [Examples]

[0047] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples. All content values ​​in these examples are given in mass percent.

[0048] The evaluation methods and criteria are as follows:

[0049] In each case, a real-world usage test was conducted with N=6 participants, and the spreadability, powdery feel, finish, and makeup longevity were evaluated. The evaluation criteria were based on a 5-point scale from 1 to 5, as shown below. The average score (rounded to two decimal places) was used to determine the evaluation in four stages.

[0050] (Evaluation score) 5 out of 5 stars; very good 4 points; Good 3 points; average 2 points; slightly inferior 1 point; inferior

[0051] (Evaluation Criteria) ◎; Average rating of 4.1 or higher ○; Average rating score: 3.1 to 4.0 △; Average rating score: 2.1 to 3.0 ×; Average rating score is 2.0 or lower

[0052] (Examples 1-5, Comparative Example 1) The particle size (volume-average particle diameter) of the spherical particles of component (a) was investigated. Table 1 shows the evaluation results when five different particle sizes were selected. The solid-type oil-based powder foundations of Examples 1-5 and the foundation of Comparative Example 1 were prepared as follows: From the components shown in Table 1, predetermined amounts of components (c)-(f) and the oil were measured out and heated to 80-90°C to dissolve them. Then, predetermined amounts of components (a), (b) and the colorant were added and stirred to disperse thoroughly. After standing at 80-90°C to remove bubbles, the mixture was filled into containers and allowed to cool and solidify. The evaluation results for each sample are shown in Table 1.

[0053] Table 1 shows that oil-based powder foundations containing spherical particles with a particle size of 5-20 μm (specifically, 7 μm, 8 μm, and 15 μm) exhibited superior spreadability, powdery feel, finish, and longevity. On the other hand, foundations with a particle size of 3 μm were rated as slightly inferior in spreadability and finish, while those with a particle size of 30 μm were rated as slightly inferior in powdery feel and finish. In contrast, Comparative Example 1, which did not contain film-forming agents or volatile solvents, was rated as inferior in finish and longevity.

[0054] [Table 1]

[0055] *1: Polymethyl methacrylate: Manufactured by Matsumoto Oil & Fat Pharmaceutical Co., Ltd., Matsumoto Microsphere M-100 (volume average particle size 8 μm) *2: Polyurethane beads: Manufactured by Dainichi Seika Co., Ltd., CM-1157 (volume average particle size 15 μm) *3: Polyurethane beads: Manufactured by Dainichi Seika Co., Ltd., CM-1077 (volume average particle size 7 μm) *4: Silica beads: Manufactured by Suzuki Oil & Fat Co., Ltd., Godball G-6C (volume average particle size 3μm) *5: Silica beads: Manufactured by Suzuki Oil & Fat Co., Ltd., Godball E-90C (volume average particle size 30 μm) *6: Silicone-treated titanium oxide: Manufactured by Miyoshi Chemical Co., Ltd., SA-Titanium CR-50 (100%) *7: Silicone-treated yellow iron oxide: Manufactured by Miyoshi Chemical Co., Ltd., SA-Yellow LL-100P (100%) *8: Silicone-treated red iron oxide: Manufactured by Miyoshi Chemical Co., Ltd., SA-Red R-516PS (100%) *9: Silicone-treated black iron oxide: Manufactured by Miyoshi Chemical Co., Ltd., SA-Black-BL-100P (100%) *10: Trimethylsiloxysilicate (60% by mass solids methyl trimethicone solution): Manufactured by Shin-Etsu Chemical Co., Ltd., KF-7312T. *11: Maruzen Petrochemical Co., Ltd., Marcazole R *12: Manufactured by Dow Toray Industries, Inc. TM SH 245 Fluid *13: Kao Corporation, Leodor AO-15V *14: Manufactured by Kato Yoko Co., Ltd., Carnauba wax No. 1 *15: Manufactured by Nikko Rica Co., Ltd., purified ceresin N *16: Manufactured by Nikko Rica Co., Ltd., PMWAX82 *17: Sugar squalane, manufactured by Nikko Chemicals Co., Ltd.

[0056] (Examples 6-13) The content of spherical particles (component (a)) and titanium dioxide (component (b)) in a solid-type oil-based powder foundation was investigated. The types and contents of each component are shown in Table 2. The manufacturing method was the same as in Example 1.

[0057] As shown in Table 2, the oil-based powder foundations of Examples 6 to 11, in which spherical particles and titanium dioxide were blended in a ratio of spherical particles:titanium dioxide = 1.5:1 to 1:1.5 (mass ratio), and the total content of the above spherical particles and titanium dioxide was 35 to 55% by mass, showed overall good results. Example 12, in which the total content of spherical particles and titanium dioxide was less than 35% by mass, showed slightly inferior powderiness, finish, and makeup longevity. In contrast, Example 13, in which the total content of spherical particles and titanium dioxide exceeded 55%, showed slightly inferior makeup longevity.

[0058] [Table 2]

[0059] (Examples 14-15, Example 16, Comparative Example 2) The film-forming agent content of component (c) was investigated for solid-type oil-based powder foundations. The components and their content are shown in Table 3. The manufacturing method was the same as in Example 1. Table 3 shows that the film-forming agents in Examples 14 and 16, with a solid content of 9% by mass, exhibited excellent spreadability, powdery feel, finish, and makeup longevity. Example 15, with a solid content of 31.8% by mass, had poor spreadability and a slightly inferior powdery feel. On the other hand, the foundation in Comparative Example 2, which did not contain the film-forming agent (component (c)), was evaluated as having poor makeup longevity.

[0060] [Table 3]

[0061] The following are other formulation examples of the oil-based powder foundation of the present invention.

[0062] Table 4 shows examples of formulations for liquid-type oil-based powder foundations.

[0063] (Manufacturing method) A: Heat ingredients (c) to (e), (g) and the oil to 80-90°C until uniformly dissolved. B: Add components (a), (b), and the colorant to A and disperse them uniformly. After degassing C:B, it was filled into a container and cooled to obtain a liquid-type oil-based powder foundation.

[0064] The liquid-type oil-based powder foundations in formulation examples 1 and 2 were excellent, with a light spreadability upon application and a powdery finish that did not feel sticky.

[0065] [Table 4]

[0066] *18: Manufactured by Dow Toray Industries, Inc. TM 345Fluid *19: Moresco White P-40 (manufactured by Moresco) *20: Manufactured by Shin-Etsu Chemical Co., Ltd., KF-6017 *21: Elementis Japan Co., Ltd., Benton 38

[0067] Table 5 shows examples of formulations for W / O emulsion-type oil-based powder foundations.

[0068] (Manufacturing method) A: Heat oil phase components (c) to (e), (g) and the oil agent to 80 to 90°C and dissolve uniformly. B: Add components (a), (b) and the colorant to A and disperse uniformly. C: Add the preheated aqueous phase component (h) and preservative, and emulsify and disperse. D:C was poured into a metal dish and cooled and solidified to obtain a W / O emulsion-type oil-based powder foundation. The W / O emulsion-type oil-based powder foundations in formulation examples 3 and 4 offered good spreadability and a comfortable feel when applied to large areas of the face or frequently moving areas such as the cheeks. They also exhibited excellent film-forming properties and long-lasting makeup. Furthermore, because they contain glycerin as a moisturizing ingredient, they are also effective for skincare.

[0069] [Table 5]

[0070] *22: Methyl methacrylate crosspolymer: Manufactured by Matsumoto Oil & Fat Pharmaceutical Co., Ltd., Matsumoto Microsphere M-306 (volume average particle size 9 μm) *23: Manufactured by NOF Corporation, RG-Co-P *24: Manufactured by Ueno Pharmaceutical Co., Ltd., Mekkins M [Industrial applicability]

[0071] According to the present invention, it is possible to provide an oil-based powder foundation that has at least the same powdery feel as conventional powder foundations and solves the problem of makeup breakdown that is a drawback of conventional powder foundations. The form of the oil-based powder foundation can be prepared as a solid type, liquid type, or cream type, etc., by various formulations.

Claims

1. The following components (a) to (e); (a) Spherical particles selected from urethane powder, acrylic powder, nylon powder, silicone powder, cellulose powder, silica powder, or calcium carbonate powder, (b) Titanium dioxide, (c) A film-forming agent in paste or solid form at room temperature (25°C) in a solid content of 3 to 31.8% by mass, (d) 10 to 50% by mass of volatile oil, (e) 0.1 to 10% by mass of nonionic surfactant An oil-based powder foundation containing, An oil-based powder foundation containing 30 to 57% by mass of component (a) and component (b) in total, with a mass ratio of component (a) to component (b) of 1.5:1 to 1:1.

5.

2. The oil-based powder foundation according to claim 1, wherein the volume-average particle diameter of the spherical particles of component (a) is 5 to 20 μm.

3. The oil-based powder foundation according to claim 1, wherein component (c) is at least one selected from oil-soluble silicone resin and sugar fatty acid ester.

4. The oil-based powder foundation according to claim 1, wherein component (d) is a volatile oil having a boiling point of 150°C or higher.

5. The oil-based powder foundation according to claim 1 or 4, wherein component (d) is at least one selected from hydrocarbon oils and silicone oils.

6. The oil-based powder foundation according to claim 1, wherein component (e) is a nonionic surfactant with an HLB of 10 or less.

7. Furthermore, the oil-based powder foundation according to claim 1, further comprising ingredient (f) wax.

8. Furthermore, the oil-based powder foundation according to claim 1, further comprising ingredient (g) organically modified bentonite.

9. Furthermore, the oil-based powder foundation according to claim 1 further contains at least one selected from water and polyhydric alcohols as component (h).

10. An oil-based powder foundation according to claim 1, which does not contain water.

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