Composition for film formation

Abstract

To provide a powder dispersion for film formation that exhibits excellent dispersibility and stability during storage. [Solution] The following components (A), (B), and (C): (A) Powder, (B) One or more volatile substances selected from alcohols and ketones, and (C) Contains a polymer having fiber-forming ability, The powder (A) has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less, and a specific surface area (m²). 2 A powder dispersion containing 0.15% by mass or more and 10% by mass or less of powder having a minimum particle size (short diameter d1) (nm) of 1400 to 5500 (per g), and a film-forming composition for forming a film on the skin by electrostatic spraying of the powder dispersion.

Description

[Technical Field]

[0001] The present invention relates to a film-forming composition, and more particularly to a film-forming composition for forming a film on the skin consisting of a fibrous deposit by electrostatic spraying. [Background technology]

[0002] Various methods for forming a coating by electrostatic spraying are known, and Patent Document 1 describes a method for producing a coating on the skin by electrostatically spraying a composition containing (a) one or more volatile substances selected from water, alcohol and ketones, (b) a polymer having film-forming ability, and (c) powder directly onto the skin. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2018-177794 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] It has been found that the powder dispersion (spray composition) described in Patent Document 1 is prone to high viscosity and sedimentation of the powder layer in the volatile substance, resulting in problems with dispersibility and stability during storage. It has also been found that when such a powder dispersion with poor dispersibility and stability is used after storage to form a cosmetic film, color variations and resulting uneven color in the makeup may occur with repeated use. Therefore, the object of the present invention is to provide a powder dispersion liquid for film formation that has excellent dispersibility and stability during storage. [Means for solving the problem]

[0005] The inventors of the present invention investigated the dispersibility and dispersion stability after high-temperature storage of various powder components when dispersing powders in volatile substances. They found that by blending powders with a specific particle size and specific specific surface area, it is possible to suppress powder aggregation, which causes color variations and unevenness in cosmetic application with repeated use, and obtain a powder dispersion with excellent powder dispersion stability.

[0006] In other words, the present invention comprises the following components (A), (B), and (C): (A) Powder, (B) One or more volatile substances selected from alcohols and ketones, and (C) Contains a polymer having fiber-forming ability, The powder (A) has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less, and a specific surface area (m²). 2 The present invention provides a powder dispersion containing 0.15% to 10% by mass of powder having a minimum particle size (short diameter d1) (nm) of 1400 to 5500, and a film-forming composition for forming a film on the skin by electrostatic spraying of the powder dispersion. Furthermore, the present invention comprises the following components (A), (B), and (C): (A) Powder, (B) One or more volatile substances selected from alcohols and ketones, and (C) Contains a polymer having fiber-forming ability, The powder (A) has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less, and a specific surface area (m²). 2 The present invention provides a method for producing a coating, which involves forming a coating on the surface of an object to be coated by electrostatic spraying a powder dispersion containing 0.15% to 10% by mass of powder having a minimum particle size (short diameter d1) (nm) of 1400 to 5500 (per g) of 1400 to 5500. Furthermore, the present invention relates to the following components (A) and (C): (A) Powder, (C) Polymer having fiber-forming ability It contains, As the powder (A), at least (A1) a powder having a minimum particle diameter (minor diameter d1) of 220 nm or less and a specific surface area (m 2 / g) × minimum particle diameter (minor diameter d1) (nm) of 1400 to 5500 is contained to provide a fiber sheet.

Advantages of the Invention

[0007] Even after high-temperature storage, the powder in the powder dispersion (coating-forming composition) of the present invention can be easily redispersed by shaking. As a result, the coating obtained by electrostatic spraying using this composition will not exhibit color bleeding or color unevenness as makeup that occurs with each use.

Embodiments for Carrying Out the Invention

[0008] The terms used in this specification are used in the meanings commonly used in the art, unless otherwise specified.

[0009] The coating-forming composition of the present invention is a powder dispersion (coating-forming composition) for forming a coating composed of a deposit containing fibers on the skin by electrostatic spraying. One aspect thereof is the following components (A), (B), and (C): (A) Powder (B) One or more volatile substances selected from alcohols and ketones, and (C) A polymer having fiber-forming ability, As the powder (A), at least (A1) a powder having a minimum particle diameter (minor diameter d1) of 220 nm or less and a specific surface area (m 2 / g) × minimum particle diameter (minor diameter d1) (nm) of 1400 to 5500 is contained at 0.15 mass% or more and 10 mass% or less in the powder dispersion. The powder dispersion is a coating-forming composition for forming a coating composed of a deposit containing fibers on the skin by electrostatic spraying. Another aspect of the present invention is the following components (A), (B), and (C): (A) Powder (B) One or more volatile substances selected from alcohols and ketones, and (C) Contains a polymer having fiber-forming ability, The powder (A) has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less, and a specific surface area (m²). 2 This method for manufacturing a coating involves forming a coating on the surface of an object to be coated by electrostatic spraying a powder dispersion containing 0.15% to 10% by mass of powder (1 / g) × minimum particle size (short diameter d1) (nm) of 1400 to 5500. Another aspect of the present invention relates to the following components (A) and (C): (A) Powder, (C) Polymer having fiber-forming ability It contains, The powder (A) has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less, and a specific surface area (m²). 2 This is a fiber sheet containing powder whose minimum particle size (short diameter d1) (nm) is between 1400 and 5500 (per g).

[0010] The powder (A) used in the powder dispersion of the present invention has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less and a specific surface area (m²). 2 It contains powder with a minimum particle size (short diameter d1) (nm) of 1400 to 5500 (per g). Here, the minimum particle diameter (short diameter d1) refers to the smallest particle diameter of each particle, i.e., the short diameter (d1). The minimum particle diameter (short diameter d1) can be measured using electron microscopy. The minimum particle diameter (short diameter d1) referred to here is an averaged value. The average particle diameter is assumed to be the 50% median diameter. At this time, the long diameter (d2) can also be measured. Next, the specific surface area can be measured by the gas adsorption method, and it is preferable to measure it by the nitrogen gas adsorption method. Here, the unit of specific surface area is m 2 It is / g. Furthermore, the powder (A1) is preferably in the shape of needles, rods, or spheres. The minimum particle diameter (short diameter d1) of the powder (A1) is preferably 220 nm or less, more preferably 210 nm or less, from the viewpoint of the dispersibility and stability during storage of the powder dispersion. Further, the lower limit of the minimum particle diameter (short diameter d1) is preferably 1 nm or more, more preferably 2 nm or more, still more preferably 5 nm or more, and even more preferably 7 nm or more. The specific surface area (m 2 / g) × minimum particle diameter (short diameter d1) (nm) of the powder (A1) is preferably 1400 to 5500, more preferably 1400 to 4000, still more preferably 1500 to 3800, and even more preferably 1680 to 3600, from the viewpoint of the dispersibility and stability during storage of the powder dispersion. The specific surface area (m 2 / g) of the powder (A1) is preferably 5 to 300 m 2 / g, more preferably 7 to 280 m 2 / g, from the viewpoint of the dispersibility and stability during storage of the powder dispersion.

[0011] As the type of the powder (A1), from the viewpoint of the dispersibility and stability during storage of the powder dispersion, at least one selected from titanium oxide and hydrophobized silica is preferable. Here, as the titanium oxide, acicular titanium oxide is preferable, acicular titanium oxide having an average aspect ratio of 10 or more is more preferable, and acicular titanium oxide having an average aspect ratio of 10 to 15 is still more preferable. In these titanium oxides, in order to suppress their surface activity, those surface-treated with inorganic substances such as aluminum oxide, silicon oxide, zirconium oxide, etc., or those surface-treated with organic substances such as distearyl malate, isotridecyl isononanoate, trimethylolpropane triisostearate, etc. can also be used as long as they do not affect the particle shape. Further, those obtained by subjecting the titanium oxide surface-treated with the above inorganic substances or organic substances to a hydrophobization treatment such as silicone treatment, fatty acid treatment, metal soap treatment, fluorine treatment, etc. can also be used as long as they do not affect the particle shape. In the case of titanium dioxide, the minimum particle size (short diameter d1) is preferably 220 nm or less, and more preferably 210 nm or less, from the viewpoint of dispersibility and stability during storage of the powder dispersion. Furthermore, the lower limit of the minimum particle size (short diameter d1) is preferably 1 nm or more, more preferably 2 nm or more, even more preferably 5 nm or more, and even more preferably 7 nm or more. Specifically, it is preferably 1 nm to 220 nm, more preferably 2 nm to 210 nm, even more preferably 5 nm to 210 nm, and even more preferably 7 nm to 210 nm. Specific surface area of ​​titanium dioxide (m²) 2 The ratio of ( / g) × minimum particle size (short diameter d1) (nm) is preferably 1400 to 5500, more preferably 1400 to 4000, even more preferably 1500 to 3800, and even more preferably 1680 to 3600, from the viewpoint of dispersibility and stability during storage of the powder dispersion. Specific surface area of ​​titanium dioxide (m²) 2 ( / g) is considered to be 5-300m from the viewpoint of dispersibility and stability during storage of the powder dispersion. 2 / g is preferred, 7-280m 2 / g is more preferable, 100-250m 2 / g is more preferable, 120-220m 2 / g is even more preferable. Commercially available needle-shaped titanium oxide products include FTL-110 and FTL-200 (manufactured by Ishihara Sangyo Co., Ltd.).

[0012] Hydrophobized silica is obtained by treating the silanol groups (hydroxyl groups) on the surface of silica, which is anhydrous silicic acid, with dimethyldichlorosilane, octylsilane, hexamethyldisilazane, dimethylsilicone oil, or methacryloxysilane. Among these, silica treated with dimethyldichlorosilane, octylsilane, hexamethyldisilazane, or dimethylsilicone oil is preferred because it has an excellent effect in improving the stability of cosmetics. In the case of hydrophobic silica, the minimum particle size (short diameter d1) is preferably 210 nm or less, more preferably 50 nm or less, and even more preferably 30 nm or less, from the viewpoint of dispersibility and stability during storage of the powder dispersion. Furthermore, the lower limit of the minimum particle size (short diameter d1) is preferably 1 nm or more, more preferably 2 nm or more, even more preferably 5 nm or more, and even more preferably 7 nm or more. Specifically, it is preferably 1 nm to 210 nm, more preferably 2 nm to 50 nm, even more preferably 5 nm to 30 nm, and even more preferably 7 nm to 30 nm. Specific surface area of ​​titanium dioxide (m²) 2 The ratio of ( / g) × minimum particle size (short diameter d1) (nm) is preferably 1400 to 5500, more preferably 1400 to 4000, even more preferably 1500 to 3800, and even more preferably 1680 to 3600, from the viewpoint of dispersibility and stability during storage of the powder dispersion. The specific surface area of ​​hydrophobic silica is 5 to 300 m², from the viewpoint of dispersibility and stability during storage of the powder dispersion. 2 / g is preferred, 7-280m 2 / g is more preferable, 100-250m 2 / g is more preferable, 120-220m 2 / g is even more preferable. Commercially available hydrophobic silica products include Aerosil RX200 (manufactured by Nippon Aerosil Co., Ltd.), which is trimethylsilylated silica, and HDK H20 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.), which is dimethylsilylated silica.

[0013] From the viewpoint of dispersibility and stability during storage of the powder dispersion, the powder (A1) is preferably contained in the powder dispersion at a concentration of 0.15% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.25% by mass or more, and even more preferably 0.3% by mass or more. Furthermore, the upper limit is preferably 10% by mass or less, more preferably 7% by mass or less, even more preferably 3% by mass or less, and even more preferably 2% by mass or less. Specifically, the content is preferably 0.15% by mass or more and 10% by mass or less, more preferably 0.2% by mass or more and 7% by mass or less, even more preferably 0.25% by mass or more and 3% by mass or less, and even more preferably 0.3% by mass or more and 2% by mass or less. Furthermore, the ratio of the content (mass%) of powder (A1) to the minimum particle size (short diameter d1) (nm) of powder (A1) is preferably 0.007 or higher, more preferably 0.01 to 0.5, even more preferably 0.01 to 0.2, and even more preferably 0.01 to 0.1, from the viewpoint of dispersibility and stability during storage of the powder dispersion.

[0014] Examples of powder (A), in addition to powder (A1), include coloring pigments, extender pigments, pearl pigments, organic powders, etc., which are powders that can be incorporated into cosmetics. From the viewpoint of ensuring good dispersibility and stability of the powder dispersion during storage and consequently preventing color variations and unevenness, it is preferable to include at least a coloring pigment (A2) other than (A1). Examples of coloring pigment (A2) include inorganic coloring pigments, organic coloring pigments, and organic dyes, and one or more of these can be used.

[0015] Examples of inorganic coloring pigments include, specifically, iron oxide, iron hydroxide, iron titanate, yellow iron oxide, black iron oxide, carbon black, Prussian blue, ultramarine blue, Prussian blue titanium oxide, black titanium oxide, titanium-titanium oxide sintered products, manganese violet, cobalt violet, chromium oxide, chromium hydroxide, cobalt oxide, cobalt titanate, and other inorganic colored pigments; and inorganic white pigments such as titanium dioxide, zinc oxide, calamine, zirconium oxide, magnesium oxide, cerium oxide, aluminum oxide, and complexes thereof. One or more of these can be used. Of these, at least one or more selected from iron oxide, titanium oxide other than (A1), and zinc oxide are preferred, and one or more selected from titanium oxide other than (A1), zinc oxide, red iron oxide, yellow iron oxide, and black iron oxide are more preferred.

[0016] Examples of organic coloring pigments and organic dyes include organic tar-based 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. 405, Orange No. 203, Orange No. 204, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 401, Blue No. 1, and Blue No. 404; and organic dyes such as β-carotene, caramel, and paprika pigment. Other examples include those coated with polymers such as cellulose and polymethacrylate. Of these, it is preferable that at least Red No. 102 is included.

[0017] Examples of extender pigments include barium sulfate, calcium sulfate, magnesium sulfate, magnesium carbonate, calcium carbonate, talc, mica, kaolin, sericite, silica, aluminum silicate, magnesium silicate, aluminum magnesium silicate, calcium silicate, barium silicate, strontium silicate, metal tungstate, hydroxyapatite, vermiculite, clay, bentonite, montmorillonite, hectorite, smectite, zeolite, ceramic powder, dicalcium phosphate, alumina, aluminum hydroxide, boron nitride, synthetic mica, synthetic sericite, metal soap, and barium sulfate-treated mica. One or more of these can be used. Of these, it is preferable that the following are included: barium sulfate, calcium carbonate, mica, silica other than (A1), talc, boron nitride, and synthetic mica.

[0018] 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.

[0019] Examples of organic powders 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 phosphate salts, N-monolong-chain alkylacyl basic amino acids, and complexes thereof. One or more of these can be used. Of these, it is preferable that cellulose powder is included.

[0020] The powders (A) used in this invention can all be used as is, or one or more of them may be used after hydrophobic treatment. The hydrophobic treatment is not limited to any treatment that is normally applied to cosmetic powders, and surface treatment agents such as fluorine compounds, silicone compounds, metal soaps, amino acid compounds, lecithin, alkylsilanes, oils, and organic titanates may be used and performed by dry treatment, wet treatment, etc. Specific examples of surface treatment agents include silicone compounds such as dimethylpolysiloxane, methylhydrogenpolysiloxane, cyclic silicones, one- or both-terminated trialkoxy group-modified organopolysiloxanes, cross-linked silicones, silicone resins, and acrylic-modified silicones; metal soaps such as aluminum stearate, aluminum myristate, zinc stearate, and magnesium stearate; amino acids such as proline, hydroxyproline, alanine, glycine, sarcosine, glutamic acid, aspartic acid, and lysine, and acyl amino acids such as stearoyl glutamic acid and lauroyl aspartic acid; lecithin and hydrogenated lecithin; alkylsilanes such as methyltrimethoxysilane, ethyltrimethoxysilane, hexyltrimethoxysilane, octyltrimethoxysilane, and octyltriethoxysilane; oils such as polyisobutylene, waxes, and fats; and organic titanates such as isopropyl titanium triisostearate.

[0021] Furthermore, the powder (A) used in the present invention may also be a powder in which one or more of these types have been hydrophilized. The hydrophilization treatment is not limited to any treatment that is normally applied to cosmetic powders. For example, plant-derived polymers such as gum arabic, tragacanth, arabinogalactan, locust bean gum (carob gum), guar gum, karaya gum, carrageenan, pectin, agar, quince seed (quince), starch (rice, corn, potato, wheat), algae colloid, trant gum, locust bean gum; microbial polymers such as xanthan gum, dextran, succinoglucan, pullulan; animal-derived polymers such as collagen, casein, albumin, deoxyribonucleic acid (DNA) and its salts; starch-based polymers such as carboxymethyl starch and methylhydroxypropyl starch; cellulose-based polymers such as methylcellulose, ethylcellulose, methylhydroxypropylcellulose, carboxymethylcellulose, hydroxymethylcellulose, hydroxypropylcellulose, nitrocellulose, sodium cellulose sulfate, sodium carboxymethylcellulose, crystalline cellulose, and cellulose powder; alginate-based polymers such as sodium alginate and propylene glycol alginate; Examples include vinyl polymers such as polyvinyl methyl ether, polyvinylpyrrolidone, and carboxyvinyl polymer; polyoxyethylene polymers such as polyethylene glycol and polyethylene glycol silane; polyoxyethylene polyoxypropylene copolymer polymers; acrylic polymers such as sodium polyacrylate, polyethyl acrylate, and polyacrylamide; and inorganic silicate compounds such as silica.

[0022] As for powder (A) (other than (A1)), any powder commonly used in cosmetics can be used, including those with spherical, plate-like, or irregular shapes; particle sizes such as mist, fine particles, or pigment grade; and particle structures such as porous or non-porous.

[0023] The powder (A) is preferably contained in the powder dispersion at a concentration of 0.15% by mass or more, more preferably 0.25% by mass or more, even more preferably 0.35% by mass or more, and even more preferably 0.5% by mass or more, from the viewpoint of superior aesthetic appearance as well as dispersibility and stability during storage of the powder dispersion. Furthermore, the upper limit is preferably 25% by mass or less, more preferably 20% by mass or less, even more preferably 8% by mass or less, and even more preferably 5% by mass or less. Specifically, the content is preferably 0.15% by mass or more and 25% by mass or less, more preferably 0.25% by mass or more and 20% by mass or less, even more preferably 0.35% by mass or more and 8% by mass or less, and even more preferably 0.5% by mass or more and 5% by mass or less.

[0024] The average particle size of powder (A) (other than (A1)) is preferably 0.001 μm to 200 μm, more preferably 0.01 μm to 50 μm, even more preferably 0.02 μm to 20 μm, and still more preferably 0.05 μm to 10 μm, in order to adhere uniformly to the skin and give a natural makeup look. In this invention, the average particle size of the powder is measured by electron microscopy observation or by a particle size distribution analyzer using the laser diffraction / scattering method. Specifically, in the case of the laser diffraction / scattering method, ethanol is used as the dispersion medium and the measurement is performed using a laser diffraction / scattering particle size distribution analyzer (for example, LMS-350 manufactured by Seishin Corporation). Note that if the powder is subjected to hydrophobic or hydrophilic treatment, the average particle size and content of component (A) refer to the average particle size and mass including the hydrophobic or hydrophilic treated agent.

[0025] In the powder dispersion of the present invention, the mass ratio (A1 / A) of powder (A) to powder (A) is preferably 0.03 or higher, more preferably 0.05 or higher, more preferably 0.1 or higher, and even more preferably 0.15 or higher, from the viewpoint of dispersibility and stability during storage of the powder dispersion. Also, from the same viewpoint, it is preferably 1 or lower, more preferably 0.93 or lower, even more preferably 0.88 or lower, and even more preferably 0.83 or lower. Specifically, it is preferably 0.03 or higher and 1 or lower, more preferably 0.05 or higher and 0.93 or lower, even more preferably 0.1 or higher and 0.88 or lower, and even more preferably 0.15 or higher and 0.83 or lower.

[0026] The content of the coloring pigment (A2) other than the powder (A1) in the powder dispersion of the present invention is preferably 0% by mass or more and 15% by mass or less, more preferably 0.05% by mass or more and 9% by mass or less, even more preferably 0.1% by mass or more and 4% by mass or less, and still more preferably 0.2% by mass or more and 2.5% by mass or less, from the viewpoint of dispersibility and stability during storage of the powder dispersion, and from the viewpoint of preventing color variation and unevenness while maintaining aesthetic appeal as makeup. Furthermore, the mass ratio (A1 / A2) of powder (A1) to coloring pigment (A2) other than powder (A1) in the powder dispersion of the present invention is preferably 0.05 or more, preferably 20 or less, more preferably 10 or less, even more preferably 7 or less, and even more preferably 5 or less, from the viewpoint of dispersibility and stability during storage of the powder dispersion and from the viewpoint of preventing color variation and unevenness. Specifically, it is preferably 0.05 or more and 20 or less, more preferably 0.05 or more and 10 or less, even more preferably 0.05 or more and 7 or less, and even more preferably 0.05 or more and 5 or less.

[0027] Component (B) contained in the powder dispersion of the present invention is one or more volatile substances selected from alcohols and ketones. The volatile substance of component (B) is a substance that is volatile in a liquid state. In a powder dispersion (film-forming composition), component (B) is dispensed from the nozzle tip toward the skin after the powder dispersion is sufficiently charged by being placed in an electric field. As component (B) evaporates, the charge density of the powder dispersion becomes excessive, and component (B) further evaporates while being further refined by Coulomb repulsion, ultimately forming a film on the skin consisting of deposits containing fibers. For this purpose, the volatile substance is preferably formulated to have a vapor pressure of 0.01 kPa or more and 106.66 kPa or less at 20°C, more preferably 0.13 kPa or more and 66.66 kPa or less, even more preferably 0.67 kPa or more and 40.00 kPa or less, and even more preferably 1.33 kPa or more and 40.00 kPa or less.

[0028] Among the volatile substances of component (B), monohydric chain aliphatic alcohols, monohydric cyclic aliphatic alcohols, and monohydric aromatic alcohols are preferably used as alcohols. Examples of monohydric chain aliphatic alcohols include C1-C6 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 of these include ethanol, isopropyl alcohol, butyl alcohol, phenylethyl alcohol, n-propanol, and n-pentanol. One or more of these alcohols can be used.

[0029] Among the volatile substances of component (B), examples of ketones include diC1-C4 alkyl ketones, such as acetone, methyl ethyl ketone, and methyl isobutyl ketone. These ketones can be used individually or in combination of two or more.

[0030] The volatile substance of component (B) is more preferably one or more selected from ethanol, isopropyl alcohol, and butyl alcohol, more preferably one or more selected from ethanol and butyl alcohol, and even more preferably contains at least ethanol.

[0031] The content of component (B) in the powder dispersion is preferably 35% by mass or more, more preferably 40% by mass or more, even more preferably 45% by mass or more, and even more preferably 50% by mass or more. It is also preferably 95% by mass or less, more preferably 93% by mass or less, even more preferably 90% by mass or less, and even more preferably 85% by mass or less. Specifically, the content of component (B) is preferably 35% by mass or more and 95% by mass or less, more preferably 40% by mass or more and 93% by mass or less, even more preferably 45% by mass or more and 90% by mass or less, and even more preferably 50% by mass or more and 85% by mass or less. By including component (B) in the powder dispersion at this ratio, component (B) can be sufficiently volatilized when performing the electrostatic spray method, and a coating consisting of a deposit containing fibers on which the powder is supported can be formed. Furthermore, component (B) is preferably a volatile substance containing ethanol, and the amount of ethanol is preferably 50% by mass or more, more preferably 65% ​​by mass or more, and even more preferably 80% by mass or more, based on the total amount of volatile substances in component (B). It is also preferably 100% by mass or less. The amount of ethanol is preferably 50% by mass or more and 100% by mass or less, more preferably 65% ​​by mass or more and 100% by mass or less, and even more preferably 80% by mass or more and 100% by mass or less, based on the total amount of volatile substances in component (B).

[0032] The polymer having film-forming ability, which is component (C), is generally a substance that can dissolve in the volatile substance of component (B). Here, dissolution means that it is in a dispersed state at 20°C, and that the dispersion state is uniform to the naked eye, preferably transparent or translucent to the naked eye.

[0033] As the polymer having film-forming ability, an appropriate one is used depending on the properties of the volatile substance of component (B). Specifically, polymers having film-forming ability are broadly classified into water-soluble polymers and water-insoluble polymers. In this specification, "water-soluble polymer" refers to a polymer in which, after weighing 1 g of polymer and immersing it in 10 g of deionized water under an environment of 1 atmosphere and 23°C, 0.5 g or more of the immersed polymer dissolves in water after 24 hours. On the other hand, in this specification, "water-insoluble polymer" refers to a polymer in which, after weighing 1 g of polymer and immersing it in 10 g of deionized water under an environment of 1 atmosphere and 23°C, 0.5 g or more of the immersed polymer does not dissolve after 24 hours.

[0034] Examples of water-soluble polymers with film-forming properties include mucopolysaccharides such as pullulan, hyaluronic acid, chondroitin sulfate, poly-γ-glutamic acid, modified corn starch, β-glucan, gluco-oligosaccharides, heparin, and keratosulfate; natural polymers such as cellulose, pectin, xylan, lignin, glucomannan, galacturonic acid, psyllium seed gum, tamarind seed gum, gum arabic, tragacanth gum, soybean water-soluble polysaccharides, alginic acid, carrageenan, laminaran, agar (agarose), fucoidan, methylcellulose, hydroxypropylcellulose, and hydroxypropylmethylcellulose; and synthetic polymers such as partially saponified polyvinyl alcohol (when not used in combination with a crosslinking agent), low-saponification polyvinyl alcohol, polyvinylpyrrolidone (PVP), polyethylene oxide, and sodium polyacrylate. These water-soluble polymers can be used individually or in combination of two or more. Of these water-soluble polymers, from the viewpoint of ease of film production, it is preferable to use pullulan and synthetic polymers such as partially saponified polyvinyl alcohol, low-saponified polyvinyl alcohol, polyvinylpyrrolidone, and polyethylene oxide. When polyethylene oxide is used as the water-soluble polymer, its number-average molecular weight is preferably 50,000 to 3,000,000, and more preferably 100,000 to 2,500,000.

[0035] On the other hand, examples of water-insoluble polymers with film-forming ability 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, polyvinyl acetal diethylaminoacetate, zein (a major component of corn protein), polyester, polylactic acid (PLA), polyacrylonitrile resin, polymethacrylic acid resin, acrylic copolymers such as (octylacrylamide / hydroxypropyl acrylate / butylaminoethyl methacrylate) copolymer, acrylic resins, polystyrene resin, polyvinyl butyral resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyurethane resin, polyamide resin, polyimide resin, and polyamide-imide resin. These water-insoluble polymers can be used alone or in combination of two or more. Of these water-insoluble polymers, it is preferable to contain one or more of the following: 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, polyvinyl butyral resin, acrylic copolymer, polyurethane resin, oxazoline-modified silicone such as poly(N-propanoylethyleneimine) graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymer, water-soluble polyester, and zein; and it is more preferable to contain one or more of polyvinyl butyral resin, acrylic copolymer, and polyurethane resin.

[0036] The content of component (C) in the powder dispersion of the present invention is preferably 1% by mass or more, more preferably 4% by mass or more, even more preferably 5% by mass or more, and even more preferably 6% by mass or more. It is also preferably 45% by mass or less, more preferably 35% by mass or less, even more preferably 15% by mass or less, and even more preferably 12% by mass or less. Specifically, it is preferably 1% by mass or more and 45% by mass or less, more preferably 4% by mass or more and 35% by mass or less, even more preferably 5% by mass or more and 15% by mass or less, and even more preferably 6% by mass or more and 12% by mass or less. By blending component (C) in the powder dispersion in this proportion, a coating consisting of a deposit containing fibers on which the powder is supported can be efficiently formed. In the powder dispersion of the present invention, the mass ratio (A1 / C) of powder (A1) to component (C) is preferably 0.01 to 0.5, more preferably 0.015 to 0.4, and even more preferably 0.016 to 0.25, from the viewpoint of dispersibility and stability during storage of the powder dispersion.

[0037] The powder dispersion of the present invention may contain an oil (D) that is liquid at 20°C. By incorporating such an oil, it becomes easier to form a uniform film containing components (A) and (C). Such oils can preferably be polar oils that are liquid at 20°C, and examples include hydrocarbon oils, ester oils, ether oils, higher alcohols, and silicone oils, which can be used individually or in combination of two or more.

[0038] Examples of the hydrocarbon oils include liquid paraffin, squalane, squalene, liquid isoparaffin, n-octane, n-heptane, cyclohexane, and light isoparaffin. From the viewpoint of forming a uniform film, liquid paraffin and squalane are preferred. Furthermore, from the viewpoint of forming a uniform film, isododecane, isohexadecane, and hydrogenated polyisobutene, which have a viscosity of less than 10 mPa·s at 30°C, are preferred. The viscosity here is measured at 30°C using a Type B viscometer (TVB-10 model, manufactured by Toki Sangyo Co., Ltd.) under the following conditions: rotor No. 1, 60 rpm, 1 minute.

[0039] Examples of the ester oil include esters comprising a straight-chain or branched-chain fatty acid and a straight-chain or branched-chain alcohol or polyhydric alcohol. 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, cholesteryl 1,2-hydroxystearylate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, tri-2-Glyceryl ethylhexanoate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, diethylhexyl naphthalenedicarboxylate, alkyl benzoate (C12-C15), cetearyl isononanoate, caprylic / capric triglyceride, butylene glycol dicaprylate / capric triglyceride, glyceryl trilaurate, glyceryl trimiristate, glyceryl tripalmitate, glyceryl triisostearate, glyceryl tri-heptylundecanoate, glyceryl tribehenate, glyceryl coconut oil fatty acid, methyl castor oil fatty acid, oleyl oleate, 2-heptylundecyl palmitate, diisobutyl adipate N-Lauroyl-L-Glutamate-2-Octyldodecyl Ester, Di-2-Heptylundecyl Adipate, Ethyl Laurate, Di-2-Ethylhexyl Sebacate, 2-Hexyldecyl Myristate, 2-Hexyldecyl Palmitate, 2-Hexyldecyl Adipate, Diisopropyl Sebacate, Di-2-Ethylhexyl Succinate, Triethyl Citrate, 2-Ethylhexyl Paramethoxycinnamate, Tripropylene Glycol Dipivalate, Phytosteryl / Octyldodecyl Lauroyl Glutamate, Dipentaerythrityl Tripolyhydroxystearate, Dipentaerythrityl Pentaisostearate, Dipentaerythrityl Tetraisostearate, (Behenic Acid / Polyhydroxystearic Acid) Examples include pentaerythrityl, 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. Among these, octyldodecyl myristate, myristyl myristate, isocetyl stearate, isocetyl isostearate, cetearyl isononanoate, diisobutyl adipate, di-2-ethylhexyl sebacate, isopropyl myristate, isopropyl palmitate, diisostearyl malate, neopentyl glycol dicaprate, alkyl benzoate (C12-C15), tri(caprylic / capric acid) glycerin, di(phytosteryl / octyldodecyl) lauroyl glutamate, dipentaerythrityl tripolyhydroxystearate, dipentaerythrityl pentaisostearate, dipentaerythrityl tetraisostearate, (behenate / polyhydroxystearate) At least one or more selected from pentaerythrityl is preferred, and at least one or more selected from isopropyl myristate, isopropyl palmitate, diisostearyl malate, neopentyl glycol dicaprate, alkyl benzoate (C12-C15), caprylic / capric triglyceride, phytosteryl octyldodecyl lauroyl glutamate, dipentaerythrityl tripolyhydroxystearate, dipentaerythrityl pentaisostearate, dipentaerythrityl tetraisostearate, and pentaerythrityl behenate / polyhydroxystearate is more preferred, and at least one or more selected from neopentyl glycol dicaprate, diisostearyl malate, caprylic / capric triglyceride, and phytosteryl / octyldodecyl lauroyl glutamate is even more preferred.

[0040] Examples of the aforementioned ether oils include cetyl-1,3-dimethylbutyl ether, dicapryl ether, dilauryl ether, and diisostearyl ether. Examples of the aforementioned higher alcohols include liquid higher alcohols having 12 to 20 carbon atoms, with branched or unsaturated higher alcohols being preferred. Specifically, examples include isostearyl alcohol, oleyl alcohol, octyldodecanol, and the like. Examples of the silicone oil include dimethylpolysiloxane, dimethylcyclopolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, and higher alcohol-modified organopolysiloxane, and it is preferable that it contains at least dimethylpolysiloxane. The kinematic viscosity of silicone oil at 25°C is 3 mm 2 Preferably 4mm or more 2 More preferably / s or higher, 5mm 2 More preferably / s or higher, 30mm 2 Preferably less than / s, and 20mm 2 / s or less is more preferable, 10mm 2 / s or less is even more preferable.

[0041] The content of component (D) (oil) in the powder dispersion of the present invention is preferably 0.1% by mass or more, more preferably 1% by mass or more, even more preferably 3% by mass or more, even more preferably 5% by mass or more, and also preferably 30% by mass or less, more preferably 25% by mass or less, even more preferably 20% by mass or less, and even more preferably 18% by mass or less. Specifically, it is preferably 0.1% by mass or more and 30% by mass or less, more preferably 1% by mass or more and 25% by mass or less, even more preferably 3% by mass or more and 20% by mass or less, and even more preferably 5% by mass or more and 18% by mass or less.

[0042] Furthermore, the powder dispersion of the present invention may contain glycol. Examples of glycols include ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, dipropylene glycol, polyethylene glycol, and polypropylene glycol. From the viewpoint of sufficiently volatilizing component (B) when performing the electrostatic spray method, the amount is preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.5% by mass or more and 7% by mass or less, and even more preferably 1% by mass or more and 5% by mass or less.

[0043] The powder dispersion may further contain polymer plasticizers with film-forming properties, surfactants, fragrances, repellents, antioxidants, stabilizers, preservatives, various vitamins, etc. The content of these components is preferably 0.01% by mass or more and 30% by mass or less, and more preferably 0.1% by mass or more and 20% by mass or less.

[0044] In the first embodiment of the present invention, the powder dispersion is used to form a coating consisting of fiber-containing deposits on the skin by electrostatic spraying. In the second embodiment of the present invention, the powder dispersion is used to form a coating consisting of fiber-containing deposits on the surface of an object to be coated by electrostatic spraying, and this is a method for producing a coating.

[0045] When performing electrostatic spraying, the powder dispersion used has a viscosity of preferably 1 mPa·s or more, more preferably 10 mPa·s or more, and even more preferably 50 mPa·s or more at 25°C. Alternatively, a dispersion with a viscosity of preferably 5000 mPa·s or less, more preferably 2000 mPa·s or less, and even more preferably 1500 mPa·s or less at 25°C is used. The viscosity of the powder dispersion is preferably 1 mPa·s or more and 5000 mPa·s or less at 25°C, more preferably 10 mPa·s or more and 2000 mPa·s or less, and even more preferably 50 mPa·s or more and 1500 mPa·s or less. The viscosity of the powder dispersion is measured at 25°C using an E-type viscometer. For example, an E-type viscometer manufactured by Tokyo Keiki Co., Ltd. can be used. In this case, rotor No. 43 can be used.

[0046] The powder dispersion is sprayed onto a target area for film formation, such as human skin, by an electrostatic spraying method. The electrostatic spraying method includes the step of electrostatically spraying the powder dispersion onto a target area for film formation, such as human skin, using an electrostatic spraying device. The electrostatic spraying device basically includes a container for containing the powder dispersion, a nozzle for discharging the powder dispersion, a supply device for supplying the powder dispersion contained in the container to the nozzle, and a power supply for applying voltage to the nozzle. A specific example of the electrostatic spraying device and its operating method are described in Patent Document 1. The entire contents of Patent Document 1 are incorporated herein by reference.

[0047] This electrostatic spraying method allows for the efficient formation of a coating (fiber sheet) consisting of a deposit containing powder-supported fibers on target areas such as human skin. The coating formed by the manufacturing method of the present invention comprises the following components (A) and (C): (A) Powder, (C) Polymer having fiber-forming ability It contains, The powder (A) has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less, and a specific surface area (m²). 2 This is a fiber sheet containing powder whose minimum particle size (short diameter d1) (nm) is between 1400 and 5500 (per g). The components (A) and (C) contained in the obtained fiber sheet are the same as described above. The components of component (A), such as the powders (A1) and (A2), are also the same as described above. The concentration of each component differs from that of the powder dispersion because component (B) has evaporated, but the ratio of component (A) to component (C), and the ratio of each component in component (A) to component (C), are the same as described above.

[0048] The resulting fiber sheet has the effect of easily redispersing the powder by shaking, even after the powder dispersion has been stored at high temperatures. Therefore, with repeated use, color variations and the resulting uneven color in makeup will not occur. Accordingly, the film (fiber sheet) obtained by the present invention can be used as a makeup cosmetic such as a makeup base, foundation, concealer, blush, eyeshadow, mascara, eyeliner, eyebrow pencil, overcoat, and lipstick; as a skincare cosmetic such as a sunscreen or other UV protection cosmetic, moisturizing cosmetic, wrinkle-improving cosmetic, whitening cosmetic, sebum-controlling cosmetic, acne care cosmetic, and anti-aging cosmetic. Among these, makeup bases, foundations, concealers, overcoat agents, and sunscreens are more preferred.

[0049] With regard to the embodiments described above, the present invention further discloses the following embodiments. <1> The following components (A), (B), and (C): (A) Powder, (B) One or more volatile substances selected from alcohols and ketones, and (C) Contains a polymer having fiber-forming ability, The powder (A) has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less, and a specific surface area (m²). 2 A powder dispersion containing 0.15% by mass or more and 10% by mass or less of powder having a minimum particle size (short diameter d1) (nm) of 1400 to 5500 (per g), and a film-forming composition for forming a film on the skin by electrostatic spraying of the powder dispersion. <2> The minimum particle size (short axis d1) of the powder (A1) is preferably 220 nm or less, and more preferably 210 nm or less. Furthermore, the lower limit of the minimum particle size (short axis d1) is preferably 1 nm or more, more preferably 2 nm or more, even more preferably 5 nm or more, and even more preferably 7 nm or more. <1> The coating-forming composition described above. <3> Specific surface area (m²) of powder (A1) 2 The ratio of ( / g) × minimum particle size (short axis d1) (nm) is preferably 1400 to 5500, more preferably 1400 to 4000, even more preferably 1500 to 3800, and even more preferably 1680 to 3600. <1> or <2> The coating-forming composition described above. <4> The powder (A1) is one or more selected from titanium dioxide and hydrophobic silica. <1> ~ <3> A film-forming composition as described in any of the following. <5> The powder (A) contains a coloring pigment (A2) other than powder (A1). <1> ~ <4> A film-forming composition as described in any of the following. <6> The mass ratio (A1 / A) of powder (A) to powder (A) is preferably 0.03 or more and 1 or less, more preferably 0.05 or more and 0.93 or less, even more preferably 0.1 or more and 0.88 or less, and even more preferably 0.15 or more and 0.83 or less. <1> ~ <5> A film-forming composition as described in any of the following. <7> The mass ratio (A1 / A2) of powder (A1) to coloring pigment (A2) other than powder (A1) is preferably 0.05 or more and 20 or less, more preferably 0.05 or more and 10 or less, even more preferably 0.05 or more and 7 or less, and even more preferably 0.05 or more and 5 or less. <1> ~ <6> A film-forming composition as described in any of the following. <8> The minimum particle size (short axis d1) of titanium dioxide is preferably 1 nm or more and 220 nm or less, more preferably 2 nm or more and 210 nm or less, even more preferably 5 nm or more and 210 nm or less, and even more preferably 7 nm or more and 210 nm or less, and the specific surface area (m²) of titanium dioxide is 2 The ratio of ( / g) × minimum particle size (short axis d1) (nm) is preferably 1400 to 5500, more preferably 1400 to 4000, even more preferably 1500 to 3800, and even more preferably 1680 to 3600. <4> The described film-forming composition. <9> The minimum particle size (short axis d1) of the hydrophobic silica is preferably 1 nm to 210 nm, more preferably 2 nm to 50 nm, even more preferably 5 nm to 30 nm, and even more preferably 7 nm to 30 nm. The specific surface area (m²) of the hydrophobic silica is also specified. 2 The ratio of ( / g) × minimum particle size (short axis d1) (nm) is preferably 1400 to 5500, more preferably 1400 to 4000, even more preferably 1500 to 3800, and even more preferably 1680 to 3600. <4> The coating-forming composition described above. <10> The following components (A), (B), and (C): (A) Powder, (B) One or more volatile substances selected from alcohols and ketones, and (C) Contains a polymer having fiber-forming ability, The powder (A) has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less, and a specific surface area (m²). 2 A method for producing a coating, comprising forming a coating on the surface of an object to be coated by electrostatic spraying a powder dispersion containing 0.15% by mass to 10% by mass of powder having a minimum particle size (short diameter d1) (nm) of 1400 to 5500 (per g) of powder. <11> The following components (A) and (C): (A) Powder, (C) Polymer having fiber-forming ability It contains, The powder (A) has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less, and a specific surface area (m²). 2 A fiber sheet containing powder whose minimum particle size (short diameter d1) (nm) is 1400 to 5500 (per g). [Examples]

[0050] The present invention will now be described in more detail with reference to examples, but the present invention is not limited in any way to these examples. Unless otherwise specified, "%" means "mass%".

[0051] Examples 1-6 and Comparative Examples 1-5 (1) Preparation of powder dispersion Table 1 shows the physical properties of the powder used in the production of the powder dispersion. A powder dispersion was prepared by mixing the components listed in Tables 2-4.

[0052] (2) 9 mL of the powder dispersions listed in Tables 2-4 were placed in transparent polypropylene containers, stored under specific temperature conditions, and then shaken to evaluate their redispersibility and storage stability. (Storage condition 1) First, the absorbance of the powder dispersion was measured at 500 nm before storage began. After storing the powder dispersion at 60°C for one week, it was brought back to 25°C, shaken 10 times (with a 1 / 4 inch diameter stirring ball), and the supernatant of the powder dispersion was collected, diluted 500 times with ethanol, and its absorbance was measured. Absorbance was measured using a Shimadzu UV-1800, with the supernatant placed in a 10mm cell. The recovery rate (%) to the initial value was calculated as follows: Recovery rate (%) = (Absorbance of supernatant after storage and shaking) / (Absorbance before storage begins) The results are shown in Tables 2-4.

[0053] (Storage condition 2) First, the powder dispersion was color-measured before storage began. After storing the powder dispersion at 50°C for one month, it was brought back to 25°C and shaken (with a 1 / 4-inch diameter stirring ball) until completely uniformly mixed. Then, a sample of the powder dispersion was taken and its color was measured again. Colorimetric measurements were performed using an X-rite Color i5 spectrophotometer. The supernatant was placed in a 12.5 mm cell and measured to determine L*, a*, and b*. Using L*, a*, and b*, the color difference ΔE = √(L*² + a*² + b*²) was calculated. The results are shown in Tables 2-4.

[0054] (Storage condition 3) The change in appearance color from the initial value was sensory evaluated after shaking (using a 1 / 4-inch diameter stirring ball) a powder dispersion that had been stored at 50°C for one month until it was completely homogeneously mixed. The results are shown in Tables 2-4.

[0055] [Evaluation Criteria] A: Almost no change from immediately afterwards. B: Immediately afterward, the saturation decreases slightly, and the color change is not noticeable. C: Immediately afterwards, the saturation decreases slightly, and the color change becomes noticeable. D: Immediately afterward, the saturation decreases significantly, and the color change is quite noticeable.

[0056] The coating obtained by electrostatically spraying the powder dispersion of Example 1 was evaluated, and a uniform coating without color unevenness was obtained.

[0057] [Table 1]

[0058] [Table 2]

[0059] [Table 3]

[0060] [Table 4]

Claims

1. The following components (A), (B), and (C): (A) Powder, (B) One or more volatile substances selected from alcohols and ketones, and (C) Contains a polymer having fiber-forming ability, The powder (A) has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less, and a specific surface area (m²). 2 A powder dispersion containing 0.15% by mass or more and 10% by mass or less of powder having a minimum particle size (short diameter d1) (nm) of 1400 to 5500 (per g), and a film-forming composition for forming a film on the skin by electrostatic spraying of the powder dispersion.

2. The film-forming composition according to claim 1, wherein the content of component (A1) is 0.15% by mass or more and 10% by mass or less, the content of component (B) is 35% by mass or more and 95% by mass or less, and the content of component (C) is 1% by mass or more and 45% by mass or less.

3. The film-forming composition according to claim 1, wherein the mass ratio of component (A1) to the total amount of component (A) ((A1) / (A)) is 0.03 or more and 1 or less.

4. The film-forming composition according to claim 1, wherein the ratio of the content (mass%) of component (A1) to the minimum particle size (short diameter d1) (nm) of component (A1) is 0.007 or more.

5. The coating composition according to claim 1, wherein the component (A1) is one or more selected from titanium dioxide and hydrophobic silica.

6. Furthermore, the film-forming composition according to claim 1, comprising component (A2) a coloring pigment other than component (A1).

7. The coating composition according to claim 6, wherein the mass ratio of component (A1) to component (A2) ((A1) / (A2)) is 0.05 or more and 20 or less.

8. The following components (A), (B), and (C): (A) Powder, (B) One or more volatile substances selected from alcohols and ketones, and (C) Contains a polymer having fiber-forming ability, The powder (A) has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less, and a specific surface area (m²). 2 A method for producing a coating, comprising forming a coating on the surface of an object to be coated by electrostatic spraying a powder dispersion containing 0.15% by mass to 10% by mass of powder having a minimum particle size (short diameter d1) (nm) of 1400 to 5500 (per g) of powder.

9. The following components (A) and (C): (A) Powder, (C) Polymer having fiber-forming ability It contains, The powder (A) has at least (A1) a minimum particle size (short diameter d1) of 220 nm or less, and a specific surface area (m²). 2 A fiber sheet containing powder having a minimum particle size (short diameter d1) (nm) of 1400 to 5500 (per g).

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