Skin membrane components

Abstract

To provide a film-forming composition for skin which makes it possible to form a stable film on the skin, give a clear finish of the skin, and make the uneven texture and skin pores inconspicuous.SOLUTION: The present invention relates to a film-forming composition for skin, containing component (A): powder, and component (B): fibers, wherein the fibers have an average fiber diameter of 0.1-7 μm, and an aspect ratio (average fiber length / average fiber diameter) of 20-300, and the content of the fibers is 0.1-10 mass% with respect to the total amount of the skin film-forming composition. The mass ratio (B / A) of component (B) and component (A) is 0.02-0.4.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a skin film-forming composition that can form a good cosmetic film on the skin surface. [Background technology]

[0002] The technique of incorporating fibers into cosmetics is well known and is widely used in mascara and other cosmetics. Furthermore, a composition containing fibers and a copolymer containing carboxylate groups and polydimethylsiloxane groups in a physiologically acceptable medium has been reported for the purpose of applying makeup to keratinous substances such as skin (Patent Document 1). In addition, a technique of incorporating fibers into cosmetics to reduce the irritancy of cosmetics containing irritating ingredients has been reported (Patent Document 2), and cosmetics containing fibers and anti-aging activators to camouflage skin defects and treat signs of skin aging have also been reported (Patent Document 3). Moreover, it has been reported that a fiber dispersion in which the diameter of short fibers is 1 to 500 nm and the sum Pa of the ratio of such single fibers is 60% or more is incorporated in order to obtain a formulation solution, emulsion, or gel with excellent uniform dispersibility and long-term dispersion stability (Patent Document 4). Furthermore, a cosmetic composition containing short fibers obtained by cutting ultrafine synthetic fibers with a diameter of approximately 2 μm into lengths of 5 to 50 μm has been reported (Patent Document 5). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2002-193746 [Patent Document 2] Japanese Patent Publication No. 2002-293718 [Patent Document 3] Japanese Patent Publication No. 2002-293731 [Patent Document 4] Japanese Patent Publication No. 2005-320506 [Patent Document 5] Japanese Patent Publication No. 2001-64153 [Overview of the project] [Problems that the invention aims to solve]

[0004] However, the fiber diameter used in Patent Documents 1-3 is thick at 0.9 dtex (= 10.7 μm), and the fiber content is low, so a fiber network is not formed, resulting in problems with the durability of the cosmetic film. Furthermore, the fiber used in Patent Document 4 has a long fiber length, resulting in an extremely large aspect ratio, and it was not possible to form a highly durable film. In addition, the fiber used in the cosmetic described in Patent Document 5 has an aspect ratio that is too small, and it was not possible to form a stable film on the skin.

[0005] Furthermore, the inventors' research revealed that cosmetics containing large fiber diameters and cosmetic powders, as described in Patent Documents 1-3, have the drawback of making the skin appear dark, dull, and highlighting uneven skin texture and pores. Therefore, the object of the present invention is to provide a film-forming composition that can form a stable film on the skin, gives the skin a brighter finish, and makes the unevenness of the skin's texture and pores less noticeable. [Means for solving the problem]

[0006] Therefore, the inventors conducted various studies to solve the above problems and found that by blending ultrafine short fibers having a certain fiber diameter and aspect ratio with powder in a certain ratio, a stable film can be formed on the skin. The fibers extend across the ridges and grooves of the skin, and the powder adheres to them, resulting in a brighter skin finish and making the unevenness of the skin texture and pores less noticeable.

[0007] The present invention relates to the following components (A) and (B); (A) Powder, (B) Fibers with an average fiber diameter of 0.1 μm or more and 7 μm or less, and an aspect ratio (average fiber length / average fiber diameter) of 20 or more and 300 or less, in an amount of 0.1% to 10% by mass of the entire film-forming composition. This invention relates to a skin film-forming composition containing a component (B) and having a mass ratio (B / A) of component (B) of 0.02 or more and 0.4 or less.

[0008] The present invention also relates to a method for producing a film on the skin surface, comprising the step of applying the aforementioned skin film-forming composition to the skin. Furthermore, the present invention relates to a film containing the above-mentioned skin film-forming composition. [Effects of the Invention]

[0009] By using the skin film-forming composition of the present invention, a stable film can be formed on the skin. The fibers extend across the ridges and grooves of the skin, and the powder adheres to them, resulting in a brighter finish and making the unevenness of the skin texture and pores less noticeable. Furthermore, by layering the skin film-forming composition of the present invention with powder foundation, the unevenness of the skin texture and pores can be neatly covered, resulting in a smooth finish. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram showing the configuration of the electrostatic spraying apparatus used to form the fibers of component (B). [Modes for carrying out the invention]

[0011] The skin film-forming composition of the present invention comprises the following components (A) and (B); (A) Powder, (B) Fibers with an average fiber diameter of 0.1 μm or more and 7 μm or less, and an aspect ratio (average fiber length / average fiber diameter) of 20 or more and 300 or less, in an amount of 0.1% to 10% by mass of the entire film-forming composition. It contains such that the mass ratio (B / A) of component (B) to component (A) is 0.02 or more and 0.4 or less.

[0012] The powder of component (A) is an ingredient that produces various cosmetic effects on the film formed on the skin using the film-forming composition of the present invention. These powders (A) are solids other than component (B), and when used together with component (B), they result in a noticeably brighter skin finish and reduce the appearance of uneven skin texture and pores compared to when used as a regular powder-containing cosmetic or when used with conventional fibers with a large fiber diameter. As the powder of this component (A), there is no particular limitation as long as it is a cosmetic powder, and coloring pigments and extender pigments can be used. Among these, from the viewpoint of obtaining an excellent cosmetic effect, it is preferable to contain a coloring pigment. Here, the (A1) coloring pigment includes inorganic coloring pigments, inorganic white pigments, organic coloring pigments, organic dyes, and also includes pearl pigments (luminous powders).

[0013] Specific examples of the inorganic coloring pigments contained in the composition of the present invention include inorganic colored pigments such as red iron oxide, iron hydroxide, iron titanate, yellow iron oxide, black iron oxide, carbon black, ultramarine blue, ultramarine, titanium ultramarine, black titanium oxide, titanium·titanium oxide sintered product, manganese violet, cobalt violet, chromium oxide, chromium hydroxide, cobalt oxide, cobalt titanate, etc. Examples of the inorganic white pigments include titanium oxide, zinc oxide, calamine, zirconium oxide, magnesium oxide, cerium oxide, aluminum oxide, and composites thereof. One or more of these pigments can be used. Among these, at least one or more selected from iron oxide, titanium oxide, and zinc oxide are preferable, and one or more selected from titanium oxide, zinc oxide, red iron oxide, yellow iron oxide, and black iron oxide are more preferable.

[0014] Examples of the organic coloring pigments and organic dyes include organic tar pigments such as Red No. 3, Red No. 102, Red No. 104, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 227, Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Orange No. 203, Orange No. 204, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 401, Blue No. 1, Blue No. 404; and organic dyes such as β-carotene, caramel, paprika pigment, etc. Also, those coated with polymers such as cellulose and polymethacrylate can be mentioned.

[0015] Examples of pearl pigments (lustrous powders) include fish scale foil, titanium dioxide-coated mica (titanium mica), bismuth oxychloride, titanium dioxide-coated bismuth oxychloride, titanium dioxide-coated talc, titanium dioxide-coated colored mica, titanium dioxide-coated iron oxide-coated mica, fine particle titanium dioxide-coated titanium mica, fine particle zinc oxide-coated titanium mica, organic pigment-treated titanium mica, lower-grade titanium dioxide-coated mica, titanium dioxide-coated synthetic mica, titanium dioxide-coated plate-shaped silica, hollow plate-shaped titanium dioxide, iron oxide-coated mica, plate-shaped iron oxide (MIO), aluminum flakes, stainless steel flakes, titanium dioxide-coated plate-shaped alumina, glass flakes, titanium dioxide-coated glass flakes, pearl shells, gold leaf, gold vapor-deposited resin film, and metal vapor-deposited resin film. One or more of these can be used.

[0016] Extender pigments include inorganic extender pigments and organic extender pigments. Examples of inorganic extender pigments include barium sulfate, calcium sulfate, magnesium sulfate, magnesium carbonate, calcium carbonate, talc, mica, kaolin, sericite, silicic acid, anhydrous silicic acid, aluminum silicate, magnesium silicate, aluminum magnesium silicate, calcium silicate, barium silicate, strontium silicate, metal tungstate salts, hydroxyapatite, vermiculite, clay, bentonite, montmorillonite, hectorite, smectite, zeolite, ceramic powder, dicalcium phosphate, alumina, silica, aluminum hydroxide, boron nitride, synthetic mica, synthetic sericite, metal soap, and barium sulfate-treated mica. One or more of these can be used. Examples of organic extender pigments include silicone rubber powder, silicone resin-coated silicone rubber powder, polymethylsilsesquioxane, polyamide powder, nylon powder, polyester powder, polypropylene powder, polystyrene powder, polyurethane powder, vinyl resin powder, urea resin powder, phenolic resin powder, fluororesin powder, silicon resin powder, acrylic resin powder, melamine resin powder, polycarbonate resin, divinylbenzene-styrene copolymer, silk powder, wool powder, cellulose powder, long-chain alkyl metal phosphates, N-monolong-chain alkylacyl basic amino acids, and complexes thereof. One or more of these can be used. A composite powder of the inorganic powder and the organic powder can also be used.

[0017] The particle size of the powder preferably includes particles between 0.01 μm and 500 μm, more preferably between 0.02 μm and 100 μm, even more preferably between 0.03 μm and 10 μm, and still more preferably between 0.03 μm and 2 μm. Examples of the shape of the powder include spherical, plate-shaped, granular, and irregular shapes. In this context, plate-shaped powders are preferably those with an aspect ratio (average length / average thickness) of less than 20, more preferably less than 15, and even more preferably less than 10.

[0018] The aforementioned powders may be used after hydrophobic treatment, and a mixture in which one or more of these powders have been hydrophobically treated may also be used. The hydrophobic treatment is not limited to any treatment applied to ordinary cosmetic powders, and may be performed using surface treatment agents such as silicone compounds, alkylsilanes, metal soaps, amino acid compounds, lecithin, organic titanates, fluorine compounds, acrylic resins, methacrylate resins, and urethane resins, and may be carried out by dry treatment, wet treatment, etc. Preferred hydrophobic treatments include: treatment with silicone compounds such as dimethylpolysiloxane, methylhydrogenpolysiloxane, cyclic silicone, and organopolysiloxanes with trialkoxy groups at one or both ends; treatment with alkylsilanes such as methyltrimethoxysilane, ethyltrimethoxysilane, hexyltrimethoxysilane, caprylyltrimethoxysilane, and caprylyltriethoxysilane; treatment with metal soaps such as aluminum stearate, aluminum myristate, zinc stearate, and magnesium stearate; treatment with amino acid compounds such as proline, hydroxyproline, alanine, glycine, sarcosine, glutamic acid, aspartic acid, lysine, and their derivatives; treatment with organic titanates such as lecithin and isopropyl titanium triisostearate; treatment with fluorine compounds such as perfluoroalkylalkoxysilane, fluorine-modified silicone, perfluoropolyether, and perfluoroalkyl phosphate ester; and surface treatments such as acrylic resin treatment, methacrylate resin treatment, and urethane resin treatment. Among these, surface treatments with silicone compounds, alkylsilanes, and amino acid compounds are more preferred.

[0019] The content of component (A) powder in the film-forming composition of the present invention is preferably 0.5% by mass or more, more preferably 1% by mass or more, and even more preferably 5% by mass or more, from the viewpoint of improving the durability of the film, resulting in a brighter finish on the skin with the film formed, and making skin texture and pore irregularities less noticeable. Also, from the same viewpoint, it is preferably 94% by mass or less, more preferably 60% by mass or less, even more preferably 50% by mass or less, and even more preferably 40% by mass or less.

[0020] The component (A) powder preferably contains the coloring pigment (A1) as described above, and it is preferable that the coloring pigment is present in the film-forming composition of the present invention in an amount of 0.1% by mass or more and 60% by mass or less in order to obtain an excellent cosmetic effect. More preferably it is present in an amount of 0.3% by mass or more, even more preferably 1% by mass or more, even more preferably 50% by mass or less, even more preferably 40% by mass or less, and 30% by mass or less. Furthermore, the mass ratio (A1 / A) of the coloring pigment (A1) to component (A) is preferably 0.3 or higher, more preferably 0.4 or higher, and even more preferably 0.5 or higher. Also, from a similar viewpoint, it is preferably 1 or lower, more preferably 0.95 or lower, and even more preferably 0.9 or lower.

[0021] Component (B) is a fiber with an average fiber diameter of 0.1 μm to 7 μm and an aspect ratio (average fiber length / average fiber diameter) of 20 to 300. Component (B) forms a network within the formed film, providing durability to the film, resulting in a brighter finish on the skin, and minimizing the appearance of skin texture and pore irregularities. Component (B) exists as a solid in the film-forming composition. Furthermore, whether or not the fibers in the coating form a network can be confirmed by scanning electron microscopy (SEM). A network is a state in which the fibers dispersed in the coating intersect with each other, creating gaps between the fibers, and a state in which the components contained in the coating composition can be held in these gaps. Preferably, the intersections between the fibers are such that, for example, one fiber has two or more intersections with two or more other fibers, and they are interconnected.

[0022] The average fiber diameter is, in principle, the diameter of the fiber's cross-section. Here, if the fiber's cross-section is circular, it is the diameter; if the cross-section is elliptical, it is the major axis. The average fiber diameter of the fibers used in this invention is 0.1 μm to 7 μm, from the viewpoint of improving the fiber's conformability to the skin in the formed film, thereby improving durability, and from the viewpoint of making the skin with the formed film appear brighter, thus minimizing the appearance of skin texture and pore irregularities. From the viewpoint of improving durability, achieving a brighter finish on the skin after the film is formed, and minimizing the appearance of skin texture and pore irregularities, the film thickness is preferably 0.2 μm or more, and more preferably 0.3 μm or more. Furthermore, from the viewpoint of improving durability, resulting in a brighter finish on the skin where the film is formed, and making skin texture and pore irregularities less noticeable, the film thickness is preferably 5 μm or less, more preferably 4 μm or less, and even more preferably 3 μm or less. The average fiber diameter can be measured by observing the fibers at 2000x or 5000x magnification using SEM, selecting 100 fibers randomly from the two-dimensional image after removing defects (e.g., fiber clumps, fiber intersections), drawing lines perpendicular to the longitudinal direction of the fibers, and directly reading the fiber diameter. The average fiber diameter is then calculated by taking the arithmetic mean of these measured values. Since the fibers are dispersed in the film-forming composition, the film-forming composition is thinly applied to a substrate and measured by SEM observation.

[0023] The fiber length is preferably 20 μm to 300 μm as an average fiber length, considering that it is a length that facilitates the formation of a network, improves the durability of the formed film, and results in a brighter finish on the skin, making skin texture and pore irregularities less noticeable. The average fiber length is more preferably 25 μm or more, even more preferably 30 μm or more, and even more preferably 40 μm or more, from the viewpoint of facilitating network formation, resulting in a brighter finish on the skin with the film formed, and making skin texture and pore irregularities less noticeable. Furthermore, from the viewpoint of suppressing entanglement and twisting of fibers when the composition is applied, and from the viewpoint of resulting in a brighter finish on the skin with the film formed, and making skin texture and pore irregularities less noticeable, the thickness is more preferably 250 μm or less, and even more preferably 200 μm or less. The average fiber length can be measured by observing the fiber using a scanning electron microscope (SEM) at magnifications of 250 to 750 times, depending on the fiber length. From the resulting two-dimensional image, 100 fibers are randomly selected, removing defects (e.g., fiber clumps, fiber intersections), and lines are drawn along the longitudinal direction of the fibers to directly read their lengths. The average fiber length is then calculated by taking the arithmetic mean of these measured values.

[0024] The aspect ratio of the fibers (average fiber length / average fiber diameter) is preferably between 20 and 300, from the viewpoint of durability of the coating due to the formation of a uniform network, and from the viewpoint of the skin to which the coating is formed having a bright finish, making the unevenness of the skin texture and pores less noticeable. From the standpoint of film durability, and from the standpoint of achieving a brighter finish on the skin after the film is formed, and minimizing the appearance of skin texture and pore irregularities, a value of 25 or higher is more preferable, 27 or higher is even more preferable, and 30 or higher is even more preferable. Furthermore, from the standpoint of film durability, the resulting brighter finish on the skin, and the ability to minimize the appearance of uneven skin texture and pores, a value of 250 or less is more preferable, and 200 or less is even more preferable.

[0025] The coefficient of variation (CV) of the fiber length of component (B) is preferably 40% to 100% from the viewpoint of the fibers forming a network in the coating. A more preferable CV value is 42% or higher, and even more preferably 45% or higher, from the viewpoint of facilitating network formation, resulting in a brighter finish on the skin with the film formed, and minimizing the appearance of skin texture and pore irregularities. Furthermore, from the viewpoint of improving the storage stability of the composition, it is preferably 95% or less, and more preferably 90% or less. The CV value is calculated from the measured values ​​obtained by the fiber length measurement method described above by (standard deviation of measured fiber length) / (average fiber length) × 100 [%].

[0026] The fibers of component (B) preferably contain fibers with a length of 40 μm or more, and more preferably contain fibers with a length of 50 μm or more, from the viewpoint of forming a strong network in the film and improving the durability of the resulting film, as well as from the viewpoint of making the skin on which the film is formed look brighter and making the unevenness of the skin texture and pores less noticeable. Furthermore, regarding the fibers of component (B), it is preferable that the proportion of fibers with a fiber length of 40 μm or more in the total fiber composition is 5% to 100%, from the viewpoint of forming a strong network within the film and improving the durability of the resulting film, as well as resulting in a brighter finish on the skin with the film formed and making skin texture and pore irregularities less noticeable. It is more preferable that the content of fibers with a fiber length of 40 μm or more is 8% to 100%, and even more preferable that it is 15% to 100%, from the viewpoint of further improving durability and resulting in a brighter finish on the skin with the film formed and making skin texture and pore irregularities less noticeable. The ratio of fibers is determined by adjusting the SEM magnification from ×200 to ×750 so that 20 to 30 fibers fit into one imaging frame of the SEM, according to the fiber length. Arbitrariness is eliminated by measuring all fibers within the image under these conditions, and a total of 200 or more fibers are measured.

[0027] The fibers of component (B), i.e., the water-insoluble polymer fibers, can be produced by treating fibers obtained from a fiber-forming polymer using various known spinning techniques to shorten them into short fibers. Here, the fiber-forming polymer is usually a thermoplastic or solvent-soluble chain polymer. Preferably, it is a thermoplastic resin with a weight-average molecular weight of 1.0 × 10⁻⁶ 4 g / mol or more 2.0×10 5 Thermoplastic resins with a concentration of g / mol or less are more preferable. Among fiber-forming polymers, water-insoluble polymers are preferred in order to maintain the shape of the fibers in the film-forming agent. Furthermore, as for the spinning method, electrospinning is preferred in order to efficiently obtain fibers with a small fiber diameter, and specifically, solution spinning and melt spinning are mentioned.

[0028] Water-insoluble polymer fibers refer to materials that, when weighed at 1 atmosphere and 23°C, are immersed in 10 g of deionized water, and after 24 hours, more than 0.5 g of the immersed fiber remains undissolved.

[0029] Examples of water-insoluble polymers include fully saponified polyvinyl alcohol that can be insolubilized after film formation, partially saponified polyvinyl alcohol that can be crosslinked after film formation when used in combination with a crosslinking agent, oxazoline-modified silicones such as poly(N-propanoylethyleneimine) graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymer, biodegradable resins such as polyvinyl acetal diethylaminoacetate, zein (a major component of corn protein), polylactic acid (PLA), polybutylene succinate, polyglycolic acid, polycaprolactone, and polyhydroxyalkanoic acid, polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate, acrylic resins such as polyacrylonitrile resin and polymethacrylic acid resin, polystyrene resin, polyvinyl butyral resin, polyvinyl acetal resin, polyurethane resin, polyamide resin, polyimide resin, polyamideimide resin, polypropylene resin, polyethylene resin, and various polypeptides (collagen, gelatin, fibrin, casein, etc.). These water-insoluble polymers can be used individually or in combination of two or more. Of these water-insoluble polymers, it is preferable to use one or more selected from fully saponified polyvinyl alcohol that can be insolubilized after film formation, partially saponified polyvinyl alcohol that can be crosslinked after film formation when used in combination with a crosslinking agent, polymethacrylic acid resin and other acrylic resins, polyvinyl butyral resin, polyurethane resin, polylactic acid, oxazoline-modified silicone such as poly(N-propanoylethyleneimine) graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymer, polyvinyl acetal diethylaminoacetate, and zein. Of these, one or more selected from polyvinyl butyral resin, acrylic resin, polypropylene resin, polyester such as polylactic acid, and polyurethane resin are more preferable from the viewpoint of ease of nanofiber formation. As the acrylic resin, octylacrylamide / hydroxypropyl acrylate / butylaminoethyl methacrylate copolymer is preferred. Furthermore, the use of biodegradable resins such as polylactic acid, polybutylene succinate, polyglycolic acid, polycaprolactone, and polyhydroxyalkanoic acid is also preferable from the standpoint of reducing environmental impact. In this specification, "biodegradable" means that the degree of biodegradation of polyester, as measured in accordance with JIS K6953-1, is 30% or more.

[0030] Methods for shortening fibers include cutting, shearing, crushing, pulverizing, deburring, or defibrating. Examples include mechanical vortex pulverizers, impact crushers such as hammer crushers, jet pulverizers such as jet mills, media-type pulverizers such as ball mills and rod mills, dry pulverizers such as cutter mills and disc mills, as well as wet pulverizers using media pulverizers with liquid media, media-less pulverizers, and combinations thereof. A more preferred method for shortening the fibers involves first producing a fiber aggregate in which nanofibers are intertwined, such as a nonwoven fabric, then cutting the fiber aggregate to an appropriate size, and finally using a mechanical vortex mill, cutter mill mill, disc mill mill, wet high-speed shear medialess mill, or wet high-pressure shear medialess mill. In addition to nonwoven fabrics, the fiber aggregate may also include materials with a predetermined thickness, such as cotton-like materials.

[0031] The content of component (B) in the composition of the present invention is 0.1% by mass or more and 10% by mass or less of the total film-forming composition, from the viewpoint of durability of the formed film, ease of forming a fiber network, and the ability to make the skin with the film formed look brighter and to make the unevenness of the skin texture and pores less noticeable. A preferred content is 0.5% by mass or more, and more preferably 0.7% by mass or more, from the viewpoint of film durability, ease of forming a fiber network, and the ability to make the skin with the film formed appear brighter and reduce the appearance of uneven skin texture and pores. Furthermore, from the viewpoint of forming a stable composition, 9% by mass or less is preferred, and 8% by mass or less is more preferred. The content of component (B) in the entire film-forming composition is determined by first obtaining the fibers that are recognized as water-insoluble polymer fibers according to the definition of water-insoluble polymers from among the fibers contained in the composition. Next, these fibers are washed with a solvent in which they are insoluble, and then filtered to obtain only the water-insoluble polymer fibers. The solvent is preferably ethanol if the resin contained in component (B) is an ester-based resin such as PLA, and water if the resin is acrylic-based. The mass of the obtained water-insoluble polymer fibers can be measured and determined, and the ratio to the mass of the composition before washing, i.e., the entire film-forming composition, can be calculated by (mass of component (B) after washing) / (mass of composition before washing) × 100 (%).

[0032] The mass ratio (B / A) of component (B) to component (A) in the composition of the present invention is 0.02 or more and 0.4 or less, from the viewpoint of durability of the film, ease of forming a fiber network, and the ability to make the skin with the film formed look brighter and to make the unevenness of the skin texture and pores less noticeable. The mass ratio (B / A) is preferably 0.03 or higher, more preferably 0.05 or higher, and even more preferably 0.1 or higher, from the viewpoints of film durability, ease of forming a fiber network, and the ability to make the skin with the film formed appear brighter and reduce the appearance of uneven skin texture and pores. The mass ratio (B / A) is preferably 0.35 or less from the viewpoint of durability of the film, ease of forming a fiber network, and the ability to make the skin with the film applied look brighter and reduce the appearance of uneven skin texture and pores. More preferably it is 0.33 or less, and even more preferably 0.31 or less.

[0033] In the composition of the present invention, the fibers form a network within the formed film, and in order to improve the durability of the film, (average fiber diameter) 2 / fiber content (μm 2 The fiber content ( / mass%) is preferably in the range of 0.005 to 7. Fiber content refers to the mass percentage of fibers in the film-forming composition. From the viewpoint of sufficiently forming a uniform fiber network, this value is preferably 0.02 or higher, more preferably 0.03 or higher, and even more preferably 0.05 or higher. Furthermore, considering practical formulation amounts, it is preferably 6 or less, more preferably 5 or less, and even more preferably 4 or less. This value, i.e., (average fiber diameter) 2 / fiber content (μm 2 The value per mass (%) is an indicator of the cumulative length of fibers contained in the composition; a higher value means a shorter cumulative length.

[0034] The composition of the present invention preferably contains a liquid substance (component (C)) selected from water and a non-volatile, liquid oil at 20°C as a dispersion medium for component (B) in order to facilitate the formation of a network of component (B) fibers in the film formed on the skin when the composition of the present invention is applied to the skin. Thus, in the film-forming composition of the present invention, component (B) is dispersed or dissolved in component (C), which facilitates the formation of a fibrous network of component (B).

[0035] Component (C) is a liquid substance selected from water and non-volatile oils that are liquid at 20°C. Component (C) may include water and one or more oils selected from ester oils, ether oils, hydrocarbon oils, higher alcohols, fluorine oils, and non-volatile silicone oils. In the present invention, it is preferable to use one or more of these in combination. In the present invention, the volatile oil is an oil with a vapor pressure of 0.01 kPa or more and 106.66 kPa or less at 20°C, and the non-volatile oil is an oil that is liquid at 20°C other than the volatile oil.

[0036] As the ester oil, one or more selected from esters consisting of a straight-chain or branched-chain fatty acid and a straight-chain or branched-chain alcohol or polyhydric alcohol, or triglycerol fatty acid esters (triglycerides) can be used. Specifically, 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, isononyl isononanoate, isotridecyl isononanoate, cholesteryl 12-hydroxystearylate, ethylene glycol di2-ethylhexanoate, dipentae Lithritol fatty acid ester, n-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glyceryl di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, naphthalenedical Diethylhexyl benzoate, alkyl benzoate (12-15 carbon atoms), cetearyl isononanoate, caprylic / capric triglyceride, butylene glycol dicaprylate / capric triglyceride, glyceryl trilaurate, glyceryl trimyristate, glyceryl tripalmitate, glyceryl triisostearate, glyceryl tri-heptylundecanoate, glyceryl tribehenate, glyceryl coconut oil fatty acid, methyl castor oil fatty acid, oleyl oleate, 2-heptylundecyl palmitate One or more of the following can be used: diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di2-heptylundecyl adipate, ethyl laurate, di2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, di2-ethylhexyl succinate, triethyl citrate, ethylhexyl paramethoxycinnamate, tripylene glycol dipivalate, etc.

[0037] Among these, from the perspective of the durability of the formed film, the ease of forming a fiber network, and the ability to make the skin brighter and reduce the appearance of uneven skin texture and pores, the following ingredients were selected: octyldodecyl myristate, myristyl myristate, isocetyl stearate, isocetyl isostearate, cetearyl isononanoate, diisobutyl adipate, di-2-ethylhexyl sebacate, isopropyl myristate, isopropyl palmitate, diisostearyl malate, neopentyl glycoside dicaprate. Preferably, at least one selected from isononyl isononanoate, isotridecyl isononanoate, caprylic / capric triglyceride, isopropyl myristate, and ethylhexyl paramethoxycinnamate is included, and more preferably, one or more selected from diisostearyl malate, neopentyl glycol dicaprate, isononyl isononanoate, isotridecyl isononanoate, caprylic / capric triglyceride, isopropyl myristate, and ethylhexyl paramethoxycinnamate is included.

[0038] Examples of the ether oil include alkyl-1,3-dimethylbutyl ethers such as cetyldimethylbutyl ether, ethylene glycol dioctyl ether, glycerol monooleyl ether, and dicaprylyl ether, and one or more selected from these can be used.

[0039] Examples of the hydrocarbon oils mentioned above include liquid paraffin, squalane, squalene, polyisobutene (pentamer or more), and liquid isoparaffin, which are hydrocarbon oils that are liquid at 20°C.

[0040] Examples of higher alcohols include those with 12 to 20 carbon atoms, specifically lauryl alcohol, isostearyl alcohol, oleyl alcohol, octyldodecanol, etc., and one or more of these can be used.

[0041] In addition, animal and vegetable oils containing the above-mentioned ester oils and hydrocarbon oils can be used. Examples of animal and vegetable oils include olive oil, jojoba oil, macadamia nut oil, meadowfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, apricot kernel oil, rice germ oil, and rice bran oil.

[0042] Examples of silicone oils include dimethylpolysiloxane (5 cs or more), polyether-modified silicone, amino-modified silicone, carboxy-modified silicone, methylphenylpolysiloxane, fatty acid-modified silicone, alcohol-modified silicone, aliphatic alcohol-modified silicone, epoxy-modified silicone, fluorine-modified silicone, cyclic silicone, alkyl-modified silicone, etc., and it is preferable to use at least dimethylpolysiloxane (5 cs or more) as the silicone oil.

[0043] Examples of fluorinated oils include perfluorodecalin, perfluoroadamantane, perfluorobutyltetrahydrofuran, perfluorooctane, perfluorononane, perfluoropentane, perfluorodecane, perfluorododecane, and perfluoropolyether.

[0044] The content of component (C) in the composition of the present invention is preferably 5% by mass or more, more preferably 10% by mass or more, even more preferably 15% by mass or more, and even more preferably 20% by mass or more, considering a realistic blending amount from the viewpoint of the dispersibility of component (B) and the durability of the formed film. Furthermore, considering realistic formulation amounts, 98% by mass or less is preferred, 90% by mass or less is more preferred, 70% by mass or less is even more preferred, and 50% by mass or less is even more preferred. The content and skeletal structure of component (C) can be identified by determining the molecular structure using known techniques such as NMR (nuclear magnetic resonance), chromatography, and IR analysis, or combinations thereof. Furthermore, the content of component (C) can be measured by the above-mentioned measurement methods, for example, by the intensity of the measured value of the portion showing the above-mentioned skeletal structure. Furthermore, the amount of water (C1) in the film-forming composition of component (C) is preferably 1% by mass or more, more preferably 5% by mass or more, even more preferably 10% by mass or more, even more preferably 15% by mass or more, preferably 98% by mass or less, more preferably 90% by mass or less, even more preferably 70% by mass or less, and even more preferably 50% by mass or less, from the viewpoint of durability of the film, ease of forming a fiber network, and the ability to make the skin with the film formed look brighter and to make the unevenness of the skin texture and pores less noticeable. Furthermore, the mass ratio (C1) / (C) of component (C1) to component (C) is preferably 0.4 or higher, more preferably 0.5 or higher, even more preferably 0.6 or higher, even more preferably 0.7 or higher, preferably 0.96 or lower, more preferably 0.9 or lower, even more preferably 0.85 or lower, and even more preferably 0.8 or lower.

[0045] The skin coating composition of the present invention may further contain oils other than component (C), volatile components, surfactants, polyols that are liquid at 20°C, preservatives, humectants, UV absorbers, water-soluble polymers, amino acids, dyes, etc.

[0046] Other oils besides component (C) are not limited as long as they are solid or semi-solid at 20°C and commonly used in cosmetics, and include, for example, mineral waxes such as ozokerite and ceresin; petroleum waxes such as paraffin and microcrystalline wax; synthetic hydrocarbons such as Fischer-Tropsch wax, polyethylene wax, and synthetic hydrocarbon wax; plant waxes such as carnauba wax, candelilla wax, rice wax, sunflower wax, and superhydrogenated jojoba oil; animal waxes such as beeswax, snow wax, and whale wax; and synthetic waxes such as silicone wax and synthetic beeswax.

[0047] Component (D) may include alcohols, ketones, volatile silicone oils, and volatile hydrocarbon oils, but one or more selected from alcohols, volatile silicones, and volatile hydrocarbon oils are preferred. The volatile component is a substance that is volatile in a liquid state. The vapor pressure of the volatile substance is 0.01 kPa or more and 106.66 kPa or less at 20°C.

[0048] Suitable volatile alcohols include, for example, monohydric chain aliphatic alcohols, monohydric cyclic aliphatic alcohols, and monohydric aromatic alcohols. Examples of monohydric chain aliphatic alcohols include C1-C6 chain alcohols, examples of monohydric cyclic alcohols include C4-C6 cyclic alcohols, and examples of monohydric aromatic alcohols include benzyl alcohol and phenylethyl alcohol. Specific examples include ethanol, isopropyl alcohol, butyl alcohol, phenylethyl alcohol, n-propanol, and n-pentanol. Ethanol is preferred from the viewpoint of usability. One or more of these alcohols can be used.

[0049] Examples of volatile silicone oils include linear dimethylpolysiloxanes such as hexamethyldisiloxane (dimethylpolysiloxane (0.65cs)), octamethyltrisiloxane (dimethylpolysiloxane (1cs)), dimethylpolysiloxane (1.5cs), and dimethylpolysiloxane (2cs); branched siloxanes such as methyltrimethicone, tris(trimethylsilyl)methylsilane, and tetrakis(trimethylsilyl)silane; and cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane. Of these, linear dimethylpolysiloxane and branched siloxane are preferred from the viewpoint of superior feel and finish, more preferably containing one or more of hexamethyldisiloxane (dimethylpolysiloxane (0.65cs)), octamethyltrisiloxane (dimethylpolysiloxane (1cs)), dimethylpolysiloxane (1.5cs), dimethylpolysiloxane (2cs), and methyltrimethicone, even more preferably containing at least one or more of hexamethyldisiloxane (dimethylpolysiloxane (0.65cs)), octamethyltrisiloxane (dimethylpolysiloxane (1cs)), and methyltrimethicone, and even more preferably containing at least one or more of hexamethyldisiloxane (dimethylpolysiloxane (0.65cs)) and octamethyltrisiloxane (dimethylpolysiloxane (1cs)).

[0050] Examples of volatile hydrocarbon oils include paraffinic hydrocarbon oils such as n-decane, n-undecane, and n-dodecane; isoparaffinic hydrocarbon oils such as isodecane, isododecane, and hydrogenated polyisobutene; and cyclic paraffinic hydrocarbon oils such as cyclodecane and cyclododecane. Of these, isoparaffinic hydrocarbon oils are preferred from the viewpoint of providing a good feel and suppressing unevenness in the finish, isoparaffinic hydrocarbon oils having 8 to 16 carbon atoms are more preferred, isoparaffinic hydrocarbon oils having 10 to 16 carbon atoms are even more preferred, and it is even more preferable that they contain at least isododecane. As for the volatile oil, it is preferable to include one or more selected from isododecane and dimethylpolysiloxane, which have a kinematic viscosity of 2 cSt or less at 25°C, from the viewpoint of excellent usability and finish. The kinematic viscosity can be measured, for example, using an Ubbelohde viscometer. The content of volatile components in the composition of the present invention is preferably 1% by mass or more, more preferably 10% by mass or more, even more preferably 25% by mass or more, preferably 60% by mass or less, more preferably 50% by mass or less, and even more preferably 45% by mass or less, based on the total content of the film-forming composition, from the viewpoint of durability of the formed film, ease of forming a fiber network, and the ability to make the skin on which the film is formed look brighter and to make the unevenness of the skin texture and pores less noticeable.

[0051] Examples of surfactants include nonionic surfactants, anionic surfactants, and cationic surfactants, with nonionic surfactants being preferred. Examples include polyoxyethylene-methylpolysiloxane copolymer, poly(oxyethylene-oxypropylene)methylpolysiloxane copolymer, cross-linked polyether-modified silicone, cross-linked alkyl polyether-modified silicone, cetyl dimethicone copolyol, sorbitan monooleate, glyceryl stearate, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, sorbitan sesquioleate, and diglyceryl monooleate. These surfactants may be used individually or in combination of two or more. The surfactant content in the composition of the present invention is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.3% by mass or more, preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less, based on the total mass of the film-forming composition, from the viewpoint of durability of the formed film, ease of forming a fiber network, and the ability to make the skin with the film formed look brighter and to make the unevenness of the skin texture and pores less noticeable.

[0052] Examples of polyols that are liquid at 20°C include alkylene glycols such as ethylene glycol, propylene glycol, 1,3-propanediol, and 1,3-butanediol; polyalkylene glycols such as diethylene glycol, dipropylene glycol, polyethylene glycol, and polypropylene glycol with a weight-average molecular weight of 2000 g / mol or less; and glycerin derivatives such as glycerin, diglycerin, and triglycerin. Of these, ethylene glycol, propylene glycol, 1,3-butanediol, dipropylene glycol, polyethylene glycol with a weight-average molecular weight of 2000 g / mol or less, glycerin, and diglycerin are preferred, propylene glycol, 1,3-butanediol, and glycerin are more preferred, and propylene glycol and 1,3-butanediol are even more preferred.

[0053] The composition of the present invention can take the form of an oily cosmetic or an emulsified cosmetic, and more specifically, an oily cosmetic, a water-in-oil emulsified cosmetic, or an oil-in-water emulsified cosmetic. Among these, the emulsified cosmetic is preferred, and the water-in-oil emulsified cosmetic is more preferred. The composition of the present invention can be produced by conventional methods, by heating and mixing the above-mentioned components as necessary. Furthermore, the skin film-forming composition of the present invention can be applied as, for example, makeup cosmetics such as makeup base, foundation, concealer, blush, eyeshadow, mascara, eyeliner, eyebrow products, overcoat agents, and lipstick; UV protection cosmetics such as sunscreen lotion and sunscreen cream; and skincare cosmetics such as lotion, emulsion, cream, serum, and pack. It is particularly suitable as a makeup cosmetic and a UV protection cosmetic.

[0054] The composition of the present invention is a skin film-forming composition that, when applied to the skin, can form a uniform film on the skin surface. This film contains a network of fibers, resulting in a highly durable film. Furthermore, the fibers extend across the skin's ridges and grooves, and powder adheres to the fibers, resulting in a brighter finish and effectively concealing skin texture and pore irregularities. Additionally, by layering the skin film-forming composition of the present invention with powder foundation, skin texture and pore irregularities can be effectively concealed, resulting in a smooth finish.

[0055] When the composition of the present invention is applied to the skin, a highly durable powder-containing cosmetic film can be formed on the skin surface. Means of applying the composition to the skin include application by fingers, application by spray, application using tools such as rollers or sponges, and application of stick-type solid cosmetics. According to the present invention, the film formed on the skin surface is not only highly durable, but the fibers extend across the ridges and grooves of the skin, and the powder adheres to the fibers, resulting in a brighter finish and effectively covering uneven skin texture and pores. Here, the thickness of the film depends on the amount applied, but is within the normal range for use (application basis weight 1 mg / cm²). 2 More than 3mg / cm 2 In the following, the thickness is preferably 0.3 μm to 30 μm, and more preferably 0.5 μm to 20 μm. The thickness is measured on the substrate after coating using a contact-type film thickness gauge (Mitutoyo Lightmatic VL-50A). The substrate used here is made of PET.

[0056] With regard to the embodiments described above, the present invention further discloses the following compositions, manufacturing methods, and coatings.

[0057] <1> The following components (A) and (B); (A) Powder, (B) Fibers with an average fiber diameter of 0.1 μm or more and 7 μm or less, and an aspect ratio (average fiber length / average fiber diameter) of 20 or more and 300 or less, in an amount of 0.1% to 10% by mass of the entire film-forming composition. A skin film-forming composition containing the above, wherein the mass ratio (B / A) of component (B) to component (A) is 0.02 or more and 0.4 or less.

[0058] <2> Component (B) is a water-insoluble polymer fiber. <1> The skin film-forming composition described above. <3> The aspect ratio (average fiber length / average fiber diameter) of component (B) is between 25 and 300. <1> or <2> The skin film-forming composition described above. <4> The content of component (A) is 0.5% by mass or more and 98% by mass or less of the total film-forming composition. <1> ~ <3> A skin film-forming composition as described in any of the following. <5> Furthermore, it contains component (C) a non-volatile liquid substance. <1> ~ <4> A skin film-forming composition as described in any of the following. <6> Component (A) is one or more selected from extender pigments and coloring pigments, preferably including coloring pigments. <1> ~ <5> A skin film-forming composition as described in any of the following. <7> Component (A) contains one or more coloring pigments selected from inorganic coloring pigments, inorganic white pigments, organic coloring pigments, organic dyes, and pearl pigments (lustrous powders). <1> ~ <6> A skin film-forming composition as described in any of the following. <8> Component (A) contains a coloring pigment, and the content of the coloring pigment is 0.1% by mass or more and 60% by mass or less in the film-forming composition. <1> ~ <7> A skin film-forming composition as described in any of the following. <9> The mass ratio (A1 / A) of the coloring pigment (A1) to component (A) is preferably 0.3 or more, more preferably 0.4 or more, even more preferably 0.5 or more, and also preferably 1 or less, more preferably 0.95 or less, and even more preferably 0.9 or less. <1> ~ <8> A skin film-forming composition as described in any of the following. <10> The average fiber diameter of component (B) is 0.2 μm or more and 5 μm or less, preferably 0.3 μm or more and 4 μm or less, and more preferably 0.3 μm or more and 3 μm or less. <1> ~ <9> A skin film-forming composition as described in any of the following. <11> Component (B) is a water-insoluble polymer fiber. <1> ~ <10> A skin film-forming composition as described in any of the following. <12> Component (B) is a fiber having one or more polymers selected from fully saponified polyvinyl alcohol that can be insolubilized after film formation, partially saponified polyvinyl alcohol that can be crosslinked after film formation when used in combination with a crosslinking agent, acrylic resins such as polymethacrylic acid resin, polyvinyl butyral resin, polyurethane resin, polylactic acid, oxazoline-modified silicones such as poly(N-propanoylethyleneimine) graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymer, polyvinyl acetal diethylaminoacetate, and zein; preferably, the fiber having one or more polymers selected from polyvinyl butyral resin, acrylic resin, polypropylene resin, polyurethane resin, polylactic acid, polybutylene succinate, polyglycolic acid, polycaprolactone, and polyhydroxyalkanoic acid. <1> ~ <11> A skin film-forming composition as described in any of the following. <13> Component (B) is a fiber containing an (octylacrylamide / hydroxypropyl acrylate / butylaminoethyl methacrylate) copolymer. <1> ~ <12> A skin film-forming composition as described in any of the following. <14> The average fiber length of component (B) is 20 μm or more and 300 μm or less, preferably 25 μm or more and 250 μm or less, more preferably 30 μm or more and 200 μm or less, and even more preferably 40 μm or more and 200 μm or less. <1> ~ <13> A skin film-forming composition as described in any of the following. <15> The aspect ratio (average fiber length / average fiber diameter) of component (B) is 25 or more and 300 or less, preferably 27 or more and 250 or less, and more preferably 30 or more and 200 or less. <1> ~ <14> A skin film-forming composition as described in any of the following. <16> The CV value of the fiber length of component (B) is 40% or more and 100% or less, preferably 42% or more and 95% or less, and more preferably 45% or more and 90% or less. <1> ~ <15> A skin film-forming composition as described in any of the following. <17> Component (B) contains fibers with an average fiber length of 40 μm or more, preferably containing fibers with an average fiber length of 50 μm or more. <1> ~ <16> A skin film-forming composition as described in any of the following. (Average fiber diameter) in the composition 2 / Fiber content (μm 2 / Mass %) is 0.02 or more and 7 or less, preferably 0.02 or more and 6 or less, more preferably 0.03 or more and 5 or less, and even more preferably 0.05 or more and 4 or less. The skin film-forming composition according to any one of <1> to <17>. <19> The content of component (B) is 0.1% by mass or more and 10% by mass or less, preferably 0.5% by mass or more and 9% by mass or less, and more preferably 0.7% by mass or more and 8% by mass or less. The skin film-forming composition according to any one of <1> to <18>. <20> The mass ratio (B / A) of component (B) to component (A) is 0.02 or more and 0.4 or less, preferably 0.03 or more and 0.35 or less, more preferably 0.05 or more and 0.33 or less, and even more preferably 0.1 or more and 0.31 or less. The skin film-forming composition according to any one of <1> to <19>. <21> Component (C) is preferably at least one selected from water and an oil agent that is liquid at 20°C. The skin film-forming composition according to any one of <5> to <20>. <22> Component (C) is water and one or more oil agents selected from ester oil, ether oil, hydrocarbon oil, higher alcohol, fluorine oil, and non-volatile silicone oil. The skin film-forming composition according to any one of <5> to <20>. <23> Component (B) is preferably dispersed in component (C). The skin film-forming composition according to any one of <5> to <21>. <24> Component (B) is a biodegradable resin. The skin film-forming composition according to any one of <1> to <23>. <25> A method for producing a film on the skin surface, including the step of applying the film-forming composition according to any one of <1> to <24> to the skin. <26> A film containing the skin film-forming composition according to any one of <1> to <24>. <27> Use of the film-forming composition according to any one of <1> to <24> as an emulsified cosmetic. <28> <1> ~ <24> Use of a film-forming composition described in any of the above, applied to the skin, preferably the face, for makeup and / or UV protection. <29> The above for manufacturing a powder-containing cosmetic film on the skin surface <1> ~ <24> Use of any of the skin film-forming compositions described above. [Examples]

[0059] The present invention will now be described in more detail with reference to examples.

[0060] [Example of manufacturing component (B)] An example of the manufacturing process for fiber B is shown. (1) An acrylic resin ((octylacrylamide / hydroxypropyl acrylate / butylaminoethyl methacrylate) copolymer) was dissolved in ethanol to obtain an 18% by mass solution. Using this solution, a nanofiber sheet was formed on the surface of the collector using the electrospinning apparatus shown in Figure 1. The manufacturing conditions for the nanofibers were as follows: • Applied voltage: 30kV • Capillary-collector distance: 150mm • Aqueous solution discharge rate: 12mL / hour • Environment: 25℃, 30%RH (2) After cutting the obtained nanofiber sheets as appropriate, a disperser blade was attached to a stirring system (Primix Corporation, Lablution® registered trademark), and the sheets were ground at a rotation speed of 5000 rpm for 30 minutes to obtain fiber B. Fibers A, C, and F were manufactured in the same manner as fiber B, by varying the polymer concentration, rotation speed, and shear time.

[0061] Furthermore, an example of the manufacturing of fiber G is shown. (1) Ester resin (polylactic acid) was dissolved in chloroform and dimethylformamide (80:20 weight ratio) to obtain a 20% by mass solution. Using these solutions, a nanofiber sheet was formed on the surface of the collector using the electrospinning apparatus shown in Figure 1. The manufacturing conditions for the nanofibers were as follows: • Applied voltage: 30kV • Capillary-collector distance: 150mm • Aqueous solution discharge rate: 12mL / hour • Environment: 25℃, 30%RH (2) The obtained nanofiber sheet was sheared using a dispersion device (Milder, manufactured by Taiheiyo Kiko Co., Ltd.) at 13,500 rpm for 8 passes through a circulation line to obtain fibers. Fiber H was produced in the same manner as fiber G, by varying the polymer concentration and circulation rate.

[0062] Furthermore, fiber I was manufactured by Cosmeterias Co., Ltd.: White Naiver 0.5-6D.

[0063] [Examples of composition manufacturing] The obtained fibers were combined with the components listed in Tables 1 to 4 to obtain a water-in-oil emulsion composition.

[0064] [Examples 1-12 and Comparative Examples 1-4] Using the water-in-oil emulsion compositions shown in Tables 1-4, 1 mg / cm³ was applied to the pore model. 2 The base coat was applied, and its finish was evaluated. The finish was also evaluated when the same amount of powder foundation was applied. The evaluation was performed in comparison to the standard cosmetic formulation shown in Table 5, as described below. The results are shown in Tables 1 to 4.

[0065] (Evaluation method) A pore model (manufactured by Viewlux Co., Ltd.: cheek skin model No. 10A) was half-applied with the standard formula (Table 5) and the cosmetics listed in Tables 1-4. After application, the brightness was visually evaluated (N=5, compared to the standard formula). Afterward, powder foundation (Sofina Alblanc: Transclear White Foundation UV Powder) was applied, and its effect in covering unevenness and its smooth finish were visually evaluated (N=5). The evaluation criteria were as follows: Tables 1-4 were superior = 1 point; no difference or the standard prescription was superior = 0 points; with a maximum score of 5 points.

[0066] [Table 1]

[0067] [Table 2]

[0068] [Table 3]

[0069] [Table 4]

[0070] [Table 5] [Explanation of Symbols]

[0071] 10 Electrostatic spray device 11 Syringe 12 High-voltage sources 13 Conductive collector 11a Cylinder 11b Piston 11c Capillary

Claims

1. The following components (A), (B), and (C); (A) Powder, (B) Fibers with an average fiber diameter of 0.1 μm or more and 7 μm or less, an average fiber length of 25 μm or more and 250 μm or less, and an aspect ratio (average fiber length / average fiber diameter) of 27 or more and 250 or less, in an amount of 0.1% to 10% by mass of the entire film-forming composition. (C) (C1) Water, in an amount of 10% to 70% by mass relative to the entire film-forming composition, and (C2) a liquid substance containing a non-volatile oil that is liquid at 20°C. A skin film-forming composition containing, wherein the mass ratio (B / A) of component (B) to component (A) is 0.02 or more and 0.4 or less, and the total content of component (C) is 15% by mass or more and 90% by mass or less.

2. The skin film-forming composition according to claim 1, wherein component (B) is a water-insoluble polymer fiber.

3. The skin film-forming composition according to claim 1 or 2, wherein the content of component (A) is 0.5% by mass or more and 98% by mass or less of the entire film-forming composition.

4. The film-forming composition according to any one of claims 1 to 3, wherein component (A) contains a coloring agent.

5. A method for producing a film on the surface of skin, comprising the step of applying a film-forming composition according to any one of claims 1 to 4 to the skin.

6. A film comprising the skin film-forming composition according to any one of claims 1 to 4.

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