Method for manufacturing coating

Abstract

The method for manufacturing the coating of the present invention comprises an electrostatic spraying step of directly electrostatically spraying a liquid composition onto the skin surface using an electrostatic spray device to form a coating on the skin. The electrostatic spray device has a container capable of accommodating a liquid composition, a nozzle for ejecting the liquid composition, and a power supply for applying a voltage to the nozzle. The liquid composition contains component (a) one or more volatile substances selected from alcohols and ketones, component (b) a water-insoluble polymer having coating forming ability, and component (c) 0.2 mass % to 25 mass % of water. The electrostatic spraying step is a step of electrostatically spraying the skin surface by applying a voltage of 5 kV to 50 kV to the nozzle using a power supply to eject the liquid composition at a flow rate of 0.4 mL / h to 30 mL / h, wherein the ratio of the flow rate (F) (mL / h) to the voltage (P) (kV) (flow rate (F) / voltage (P)) is 0.8 or less.

Description

[0001] This case is filed on April 19, 2018 、Application No. 201880025000.3(PCT / JP2018 / 016216) 、The name of the invention is Method for manufacturing coating A divisional application for a patent application. Technical Field

[0002] The invention relates to a method for manufacturing a coating. Background Art

[0003] Various methods of forming a coating by electrostatic spraying are known. For example, Patent Document 1 describes a method for treating skin, which includes the step of electrostatically spraying a composition on the skin. The composition used in the method contains a liquid insulating substance, a conductive substance, a granular powder substance, and a thickener. As the composition, a cosmetic or skin care composition containing a pigment is typically used. Specifically, a makeup foundation is used as the composition. That is, the invention described in Patent Document 1 mainly assumes that a makeup foundation is electrostatically sprayed on the skin for the purpose of beauty.

[0004] Patent Document 2 describes a disposable cartridge of an electrostatic spray device for cosmetics. The electrostatic spray device is a handheld self-contained device. The electrostatic spray device is used to spray a cosmetic foundation in the same manner as Patent Document 1.

[0005] Patent Document 3 describes a method for forming a solid or gel-like substance containing a raw material having biological activity on the skin by an electrohydrodynamic method and a device for use therein. The device is a handheld portable device.

[0006] Patent Document 4 describes a method and apparatus for producing nanofibers by ejecting a polymer solution under high voltage application and spinning the solution for the purpose of stably mass-producing the nanofibers.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: WO 01 / 12139 A1

[0010] Patent Document 2: WO 01 / 12335 A1

[0011] Patent Document 3: WO 98 / 03267A1

[0012] Patent Document 4: Japanese Patent Application Publication No. 2012-107364 Summary of the invention

[0013] The present invention provides a method for producing a coating, the method comprising: an electrostatic spraying step of directly electrostatically spraying a liquid composition onto a skin surface using an electrostatic spray device to form a coating on the skin, wherein the electrostatic spray device has:

[0014] a container capable of containing the liquid composition;

[0015] a nozzle for ejecting the liquid composition; and

[0016] A power source for applying voltage to the nozzle,

[0017] The liquid composition contains the following components (a), (b) and (c),

[0018] (a) one or more volatile substances selected from alcohols and ketones,

[0019] (b) a water-insoluble polymer having film-forming ability,

[0020] (c) 0.2% by mass or more and 25% by mass or less of water,

[0021] The electrostatic spraying step is a step of using the power supply to apply a voltage of 5 kV to 50 kV to the nozzle to spray the liquid composition at a flow rate of 0.4 mL / h to 30 mL / h, thereby electrostatically spraying the skin surface, wherein the ratio of the flow rate F (mL / h) to the voltage P (kV) (flow rate F / voltage P) is less than 0.8. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram showing the structure of the electrostatic spray device used in the present invention.

[0023] Figure 2 This is a schematic diagram showing the structure of another embodiment of the electrostatic spray device used in the present invention.

[0024] Figure 3 Yes means Figure 2 A schematic diagram showing the structure of a cartridge and a main body of the electrostatic spray device shown.

[0025] Figure 4 Yes means Figure 2 A schematic diagram of another embodiment of the cartridge portion and the main body portion of the electrostatic spray device shown.

[0026] Figure 5 This is a schematic diagram showing the structure of still another embodiment of the electrostatic spray device used in the present invention.

[0027] Figure 6 Yes means Figure 5A schematic diagram showing the structure of a cartridge portion of the electrostatic spray device shown.

[0028] Figure 7 This is a schematic diagram showing how the electrostatic spray method is performed using an electrostatic spray device. DETAILED DESCRIPTION

[0029] When electrostatic spraying is performed according to the methods described in Patent Documents 1 to 3 to form a film on the skin, the close adhesion between the skin and the film formed by the electrostatic spraying is insufficient, and the film may be damaged or peeled off due to external forces such as friction. In addition, when forming the film, the voltage applied to the film-forming liquid is unstable due to the influence of the surrounding environment such as humidity, making it difficult to stably form a film on the skin. Moreover, there is no description of the guarantee of the insulation when using the electrostatic spraying.

[0030] The method described in Patent Document 4 is a manufacturing method for the purpose of industrial production. Therefore, when electrostatic spraying is performed according to the method described in Patent Document 4 to form a film on the skin, when the film is manufactured at home or the like where it is difficult to control the surrounding manufacturing environment such as humidity compared to manufacturing in a factory, the voltage when using the electrostatic spray is unstable, and it may be difficult to stably form a film on the skin.

[0031] Therefore, the present invention relates to a method for manufacturing a coating with stable quality while ensuring the insulation performance when using electrostatic spray and being independent of the surrounding environment such as humidity.

[0032] Hereinafter, the present invention will be described based on its preferred embodiments with reference to the attached drawings. Figure 1 While explaining. In the present invention, a composition containing prescribed ingredients is directly applied to the skin to form a film. As a method for forming a film, an electrostatic spray method is adopted in the present invention. The electrostatic spray method is a method of applying a positive or negative high voltage to a composition to charge the composition, and spraying the charged composition onto an object. The sprayed composition is repeatedly micronized and diffused into space due to Coulomb repulsion, and in this process or after being attached to an object, it dries as a solvent of a volatile substance, thereby forming a film on the surface of the object.

[0033] In the present invention, the composition used in the electrostatic spraying method is a composition that is liquid in the environment where the electrostatic spraying method is performed (hereinafter, the composition is also referred to as a "liquid composition"). The liquid composition contains the following components (a) and (b).

[0034] (a) One or more volatile substances selected from alcohols and ketones. (b) A polymer capable of forming a film.

[0035] Each component is described below.

[0036] The volatile substance of component (a) is a substance that is volatile in a liquid state. In the liquid composition, component (a) is formulated for the following purpose, that is, after the liquid composition placed in the electric field is fully charged, it is sprayed from the front end of the nozzle to the skin. As component (a) evaporates, the charge density of the liquid composition becomes excessive, and the Coulomb repulsion is used to further refine and evaporate component (a) to finally form a dry film. For this purpose, the vapor pressure of the volatile substance is preferably 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, more preferably 0.67 kPa or more and 40.00 kPa or less, and more preferably 1.33 kPa or more and 40.00 kPa or less.

[0037] Among the volatile substances of component (a), alcohols preferably used are, for example, monovalent aliphatic alcohols having 1 to 6 carbon atoms, monovalent aliphatic alcohols having 3 to 6 carbon atoms, and monovalent aromatic alcohols. Specific examples thereof include ethanol, isopropanol, butanol, phenylethyl alcohol, propanol, and pentanol. One or more of these alcohols may be used.

[0038] Among the volatile substances of component (a), it is preferred to use, as ketones, for example, chain aliphatic ketones having 3 to 6 carbon atoms, cyclic aliphatic ketones having 3 to 6 carbon atoms, and aromatic ketones having 8 to 10 carbon atoms. Specific examples thereof include acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, acetophenone, etc. These ketones may be used alone or in combination of two or more.

[0039] The volatile substance of component (a) is more preferably one or more selected from ethanol, isopropanol, butanol and water, more preferably one or more selected from ethanol and butanol, and even more preferably ethanol.

[0040] The liquid composition contains a polymer having film-forming ability as component (b) together with component (a). The polymer having film-forming ability as component (b) is generally a substance that can be dissolved in the volatile substance of component (a). Here, the so-called dissolved means that it is in a dispersed state at 20° C., and the dispersed state is uniform when visually observed, preferably transparent or translucent when visually observed.

[0041] As a polymer having film-forming ability, an appropriate substance can be used according to the properties of the volatile substance of component (a). Specifically, polymers having film-forming ability are roughly divided into water-soluble polymers and water-insoluble polymers. In this specification, the so-called "water-soluble polymer" refers to a substance having the following property, that is, after weighing 1g of the polymer under an environment of 1 atmosphere and 23°C, it is immersed in 10g of ion exchange water and after 24 hours, more than 0.5g of the immersed polymer is dissolved in water. On the other hand, the so-called "water-insoluble polymer" in this specification refers to a substance having the following property, that is, after weighing 1g of the polymer under an environment of 1 atmosphere and 23°C, it is immersed in 10g of ion exchange water and after 24 hours, more than 0.5g of the immersed polymer is not dissolved.

[0042] As water-soluble polymers with film-forming ability, for example, pullulan, hyaluronic acid, chondroitin sulfate, poly-γ-glutamic acid, modified corn starch, β-glucan, oligoglucose, heparin, keratan sulfate and other mucopolysaccharides, cellulose, pectin, xylan, lignin, glucomannan, galacturonic acid, psyllium gum, tamarind seed gum, gum arabic, tragacanth gum, soybean water-soluble polysaccharide, alginic acid, carrageenan, laminarin, agar (agarose), fucoidan, methylcellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose and other natural polymers, partially saponified polyvinyl alcohol (not used in combination with a cross-linking agent), low saponified polyvinyl alcohol, polyvinyl pyrrolidone (PVP), polyethylene oxide, sodium polyacrylate and other synthetic polymers can be listed. These water-soluble polymers can be used alone or in combination of two or more. Among these water-soluble polymers, from the viewpoint of easy film production, pullulan, partially saponified polyvinyl alcohol, low saponified polyvinyl alcohol, polyvinyl pyrrolidone and synthetic polymers such as polyethylene oxide are preferably used. When polyethylene oxide is used as the water-soluble polymer, its number average molecular weight is preferably more than 50,000 and less than 3,000,000, more preferably more than 100,000 and less than 2,500,000.

[0043] On the other hand, as water-insoluble polymers with film-forming ability, for example, fully saponified polyvinyl alcohol that can be insolubilized after forming a film, partially saponified polyvinyl alcohol that can be cross-linked after forming a film by using a cross-linking agent, oxazoline-modified silicones such as poly(N-propionylethyleneimine) graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymers, polyvinyl acetal diethylaminoacetate, zein (the main component of corn protein), polyester, polylactic acid (PLA), polyacrylonitrile resin, acrylic resins such as polymethacrylic resin, polystyrene resin, polyvinyl butyral resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyurethane resins such as polyurethane-64, polyamide resin, polyimide resin, polyamide-imide resin, etc. can be listed. These water-insoluble polymers can be used alone or in combination of two or more. Among these water-insoluble polymers, it is preferred to use completely saponified polyvinyl alcohol which can be insolubilized after forming a film, partially saponified polyvinyl alcohol which can be cross-linked after forming a film by using it in combination with a cross-linking agent, polyvinyl butyral resin, polymethacrylic acid resin, polyvinyl acetal diethylaminoacetate, poly(N-propionylethyleneimine) graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymer and other oxazoline-modified silicones, polylactic acid, zein, and the like.

[0044] The content of component (a) in the liquid composition is preferably 50% by mass or more, more preferably 55% by mass or more, more preferably 60% by mass or more, and further preferably 65% ​​by mass or more. And, preferably 95% by mass or less, more preferably 94% by mass or less, more preferably 93% by mass or less, and further preferably 92% by mass or less. The proportion of component (a) in the liquid composition is preferably 50% by mass or less and 95% by mass or less, more preferably 55% by mass or less and 94% by mass or less, more preferably 60% by mass or less and 93% by mass or less, and further preferably 65% ​​by mass or less and 92% by mass or less, or preferably 55% by mass or less and 92% by mass or less. By adding component (a) to the liquid composition in this ratio, the liquid composition can be fully volatilized when the electrostatic spray method is performed.

[0045] On the other hand, the content of component (b) in the liquid composition is preferably more than 1% by mass, more preferably more than 2% by mass, more preferably more than 3% by mass, and more preferably more than 5% by mass. And, the content of component (b) is preferably less than 40% by mass, and when component (b) includes polyvinyl butyral, it is preferably less than 35% by mass, more preferably less than 30% by mass, and more preferably less than 25% by mass. The content of component (b) in the liquid composition is preferably less than 1% by mass, or preferably less than 35% by mass, more preferably less than 2% by mass, more preferably less than 30% by mass, more preferably less than 5% by mass, less than 25% by mass, or preferably less than 5% by mass, less than 40% by mass. By mixing component (b) in the liquid composition with the ratio, it is possible to smoothly form a coating as the purpose.

[0046] The liquid composition preferably contains water as a component (c) in addition to the components (a) and (b). As the water, ion-exchanged water, purified water or distilled water is preferably used.

[0047] By including water as component (c) in the liquid composition, the conductivity of the liquid composition can be improved due to the ionization of water. The high conductivity of the liquid composition can stably form a fibrous coating on the surface of the application site such as the skin when the electrostatic spray described later is implemented. In addition, water helps to improve the close fit between the coating formed by the electrostatic spray and the skin.

[0048] From the viewpoint of obtaining the above-mentioned effect, the liquid composition preferably contains component (c) of more than 0.2 mass % and less than 25 mass %. From the same viewpoint, the content of component (c) in the liquid composition is preferably more than 0.3 mass %, more preferably more than 0.35 mass %, and more preferably more than 0.4 mass %. In addition, from the viewpoint of the stable formatibility of the fibrous coating, the content of component (c) in the liquid composition is preferably less than 25 mass %, more preferably less than 20 mass %, more preferably less than 19 mass %, and more preferably less than 18 mass %. In addition, the content of component (c) in the liquid composition is preferably less than 0.2 mass % and less than 25 mass %, more preferably less than 0.3 mass % and less than 20 mass %, more preferably less than 0.35 mass % and less than 19 mass %, and further more preferably less than 0.4 mass % and less than 18 mass %, or further more preferably less than 0.3 mass % and less than 18 mass %.

[0049] From the viewpoint of stably performing film formation by the electrostatic spraying method, the mass ratio (a / c) of the content of component (a) to component (c) is preferably 3 or more, more preferably 3.5 or more, and even more preferably 4 or more. In addition, the mass ratio (a / c) of the content of component (a) to component (c) is preferably 300 or less, more preferably 250 or less, and even more preferably 210 or less. The mass ratio (a / c) of the content of component (a) to component (c) is preferably 3 or more and 300 or less, more preferably 3.5 or more and 250 or less, even more preferably 4 or more and 250 or less, and even more preferably 4 or more and 210 or less.

[0050] And, from the same viewpoint, the content mass ratio (b / c) of component (b) to component (c) is preferably 0.4 or more, more preferably 0.5 or more, and more preferably 0.6 or more. In addition, the content mass ratio (b / c) of component (b) to component (c) is preferably 140 or less, and when component (b) contains polyvinyl butyral, it is preferably 50 or less, more preferably 45 or less, and more preferably 40 or less. The content mass ratio (b / c) of component (b) to component (c) is preferably 0.4 or more and 140 or less, or preferably 0.4 or more and 50 or less, more preferably 0.5 or more and 45 or less, more preferably 0.6 or more and 40 or less, or preferably 0.6 or more and 140 or less.

[0051] From the viewpoint of dispersibility of component (b) in the liquid composition and the viewpoint of improving the formability of the coating, the mass ratio (b / a) of component (b) to component (a) is preferably 0.01 or more, more preferably 0.02 or more, more preferably 0.04 or more, and further preferably 0.07 or more. In addition, the mass ratio (b / a) of component (b) to component (a) is preferably 0.70 or less, and when component (b) contains polyvinyl butyral, it is preferably 0.55 or less, more preferably 0.50 or less, more preferably 0.30 or less, and further preferably 0.25 or less. Specifically, the content mass ratio (b / a) of component (b) to component (a) is preferably from 0.01 to 0.70, more preferably from 0.02 to 0.70, even more preferably from 0.07 to 0.70, or preferably from 0.01 to 0.55, more preferably from 0.02 to 0.50, even more preferably from 0.04 to 0.30, and even more preferably from 0.07 to 0.25.

[0052] In addition, in addition to the above-mentioned components (a), (b) and (c), the liquid composition may also contain other components. As other components, for example, plasticizers, coloring pigments, extender pigments, dyes, surfactants, UV-blocking agents, fragrances, repellents, antioxidants, stabilizers, preservatives, various vitamins, etc. of polymers with film-forming ability of component (b) can be listed. In the case where other components are contained in the spray composition, the proportion of the other components is preferably 0.1% by mass or more and 30% by mass or less, and more preferably 0.5% by mass or more and 20% by mass or less. In the case of a powder component having a particle size of 0.1 μm or more at 20° C., such as a coloring pigment and an extender pigment, the content of the powder component is preferably 1% by mass or less, more preferably 0.5% by mass or less, and more preferably 0.1% by mass or less, and more preferably no content, from the viewpoint of suppressing the clogging of the nozzle of the electrostatic spray device described later and the close adhesion of the film.

[0053] In particular, when the liquid composition contains component (c), from the viewpoint of improving the conductivity of the liquid composition and smoothly forming the coating of the electrostatic spraying method, a salt can also be added as component (d). From the viewpoint of improving conductivity, component (d) is preferably an alkali metal salt or an ammonium salt. From the viewpoint of further improving the dispersibility in the liquid composition containing component (b) and further improving the conductivity, component (d) is preferably selected from one or more of an ionic compound and an acyl amino acid ester, and more preferably selected from one or more of an ionic surfactant, an ionic polymer, a betaine compound, and an acyl amino acid ester.

[0054] Examples of the ionic surfactant include cationic surfactants, anionic surfactants, and amphoteric surfactants.

[0055] As the cationic surfactant, a quaternary ammonium salt is preferred. As the anionic surfactant, an acylamino acid salt is preferred. As component (d), one or more selected from quaternary ammonium salts and acylamino acid salts are more preferred.

[0056] Examples of the quaternary ammonium salt include tetraalkylammonium salts, benzylalkylammonium salts, benzyltrialkylammonium salts, alkylbenzyldimethylammonium salts, mono-long chain alkyltrimethylammonium salts, and di-long chain alkyldimethylammonium salts. Specific examples of the quaternary ammonium salt include cetyltrimethylammonium chloride, stearyltrimethylammonium chloride salt, behenyltrimethylammonium chloride, behenyldimethylhydroxyethylammonium chloride, distearyldiammonium chloride, stearyldimethylbenzylammonium chloride, distearyldimethylammonium chloride, dicetylmethylammonium chloride, cetyltriethylammonium methylsulfate, and benzalkonium chloride.

[0057] Examples of the acylamino acid salts include acylglutamates, acylaspartates, acylsarcosinates, acyltaurates, acylmethyltaurates, and the like, and preferred salts are alkali metal salts and ammonium salts. Examples of the acylamino acid salts include sodium myristoyl glutamate, sodium myristoyl aspartate, sodium cocoyl glutamate, sodium lauroyl glutamate, sodium lauroyl aspartate, sodium lauroyl sarcosinate, and sodium palmitoyl sarcosinate.

[0058] Examples of the amphoteric surfactant include betaine-type and sulfobetaine-type surfactants, and specific examples thereof include cocamidopropyl betaine and cocamidopropyl hydroxysulfobetaine.

[0059] As ionic polymers, any of anionic polymers, cationic polymers, and amphoteric polymers can be cited. As anionic polymers, homopolymers or copolymers having (meth)acrylic acid units can be cited, such as acrylate / C1-18 alkyl acrylate / C1-8 alkyl acrylamide copolymer AMP. As cationic polymers, homopolymers or copolymers having primary to tertiary amino groups or quaternary ammonium groups can be cited, such as ethyl acrylate / N-〔3-(dimethylamino)propyl〕acrylamide / N-tert-butylacrylamide / methacrylate-α-methyl poly(ethylene oxide)-ω-base-copolymer, poly(N-propionylethyleneimine)-graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymer-monoethyl sulfate, etc. can be cited. Examples of the amphoteric polymer include homopolymers or copolymers having an alkyl betaine unit or a sulfobetaine unit, and specific examples thereof include N-methacryloyloxyethyl-N,N-dimethylammonium-α-N-methylcarboxybetaine / alkyl methacrylate copolymers.

[0060] Examples of the betaine compound include compounds in which three methyl groups are added to the amino group of an amino acid, such as trimethylglycine, carnitine (vitamin Bt; 3-hydroxy-4-(trimethylammonio)butyrate), and acylated carnitine.

[0061] Examples of the acylamino acid esters include (phytosterol / octyldodecanol)acylamino acid esters, and specific examples thereof include di(phytosterol / octyldodecanol)lauroyl glutamate.

[0062] In particular, component (d) is preferably one or more selected from the group consisting of cationic surfactants, anionic surfactants, amphoteric surfactants, acylamino acid esters, anionic polymers, cationic polymers, amphoteric polymers and betaine compounds, and more preferably one or more selected from the group consisting of quaternary ammonium salts, acylamino acid salts, acylamino acid ester salts, homopolymers or copolymers having (meth)acrylic acid units, homopolymers or copolymers having primary to tertiary amino groups, homopolymers or copolymers having quaternary ammonium groups, homopolymers or copolymers having alkyl betaine units or sulfobetaine units, and trimethylglycine.

[0063] When salt is also added as component (d), from the viewpoint of stably forming a coating and preventing excessive rise of conductivity described later, the content of component (d) in the liquid composition is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, more preferably 0.1% by mass or more, preferably 10% by mass or less, more preferably 8% by mass or less, more preferably 6% by mass or less, further preferably 2.5% by mass or less, and further preferably 2% by mass or less. Specifically, the content of component (d) is preferably 0.01% by mass or more and 10% by mass or less, more preferably 0.05% by mass or more and 8% by mass or less, and more preferably 0.1% by mass or more and 6% by mass or less.

[0064] From the viewpoint of improving the formability of the film and the stability of spinning, the content mass ratio (d / c) of component (d) to component (c) is preferably 0.01 or more, more preferably 0.02 or more, even more preferably 0.03 or more, preferably 6 or less, more preferably 5 or less, even more preferably 4 or less. Specifically, the content mass ratio (d / c) of component (d) to component (c) is preferably 0.01 or more and 6 or less, more preferably 0.02 or more and 5 or less, even more preferably 0.03 or more and 4 or less.

[0065] When the electrostatic spray method is performed, as a liquid composition, a composition having a viscosity of preferably 5 mPa·s or more at 25°C, more preferably 10 mPa·s or more, further preferably 20 mPa·s or more, and further preferably 30 mPa·s or more is used. In addition, a composition having a viscosity of preferably 3000 mPa·s or less at 25°C, more preferably 2000 mPa·s or less, further preferably 1500 mPa·s or less, further preferably 1000 mPa·s or less, and further preferably 800 mPa·s or less is used. The viscosity of the liquid composition at 25°C is preferably 5 mPa·s or more and 3000 mPa·s or less, more preferably 5 mPa·s or more and 2000 mPa·s or less, more preferably 10 mPa·s or more and 1500 mPa·s or less, further preferably 20 mPa·s or more and 1000 mPa·s or less, and further preferably 30 mPa·s or more and 800 mPa·s or less. By using a liquid composition having a viscosity within this range, a porous coating, in particular a porous coating composed of a deposit of fibers, can be smoothly formed by an electrostatic spray method. From the viewpoints of followability to the skin and prevention of stuffiness of the skin, it is advantageous to form a porous coating. The viscosity of the liquid composition is measured at 25°C using an E-type viscometer. As an E-type viscometer, for example, an E-type viscometer manufactured by Tokyo Keiki Co., Ltd. can be used. The measurement conditions at this time are set to 25°C, the cone plate rotor is No. 43, and the rotation speed is selected appropriately according to the viscosity, and is set to 5 rpm for a viscosity of 500 mPa·s or more, 10 rpm for a viscosity of 150 mPa·s or more and less than 500 mPa·s, and 20 rpm for a viscosity of less than 250 mPa·s.

[0066] From the viewpoint of stably forming a film on the skin, the conductivity of the liquid composition at 25°C during the electrostatic spray method is preferably 8μS / cm or more, more preferably 10μS / cm or more, more preferably 20μS / cm or more, and further preferably 25μS / cm or more. In addition, from the same viewpoint, the conductivity of the liquid composition is preferably 300μS / cm or less, more preferably 260μS / cm or less, more preferably 220μS / cm or less, and further preferably 200μS / cm or less. More specifically, the conductivity of the liquid composition at 25°C is preferably 8μS / cm or more and 300μS / cm or less, more preferably 8μS / cm or more and 260μS / cm or less, more preferably 10μS / cm or more and 260μS / cm or less, further preferably 10μS / cm or more and 220μS / cm or less, and further preferably 25μS / cm or more and 200μS / cm or less. The conductivity of the liquid composition can be measured by using an impedance measuring device (SI1260, manufactured by Solartron) at a measuring terminal (SH-Z), 25°C, The conductivity of the liquid composition at 25°C can be appropriately adjusted by changing the mixing ratio of component (a), component (b), component (c) and / or component (d) under the condition that the mixing range of the above-mentioned components is satisfied.

[0067] In addition, in the liquid composition, from the viewpoint of stably obtaining a fibrous coating and from the viewpoint of improving the close adhesion of the coating, the relationship (Y / X) of the conductivity Y (μS / cm) to the viscosity X (mPa·s) at 25°C is preferably 0.1 or more, more preferably 0.2 or more, and even more preferably 0.3 or more, preferably 3.3 or less, more preferably 3 or less, even more preferably 2.5 or less, and even more preferably 2 or less. Specifically, the relationship (Y / X) of the conductivity Y (μS / cm) to the viscosity X (mPa·s) at 25°C is preferably 0.1 or more and 3.3 or less, more preferably 0.2 or more and 3 or less, and even more preferably 0.3 or more and 2.5 or less.

[0068] The liquid composition is sprayed directly onto the application site of the human skin as the target object by the electrostatic spray method. The electrostatic spray method includes the step of electrostatically spraying the liquid composition onto the surface of the skin using an electrostatic spray device. Figure 1 A schematic diagram showing the structure of an electrostatic spray device suitable for use in the present invention is shown in the figure. The electrostatic spray device 10 shown in the figure has a low-voltage power supply 11. The low-voltage power supply 11 is a power supply that can generate a voltage of several V to more than ten V. In order to improve the portability of the electrostatic spray device 10, it is preferred that the low-voltage power supply 11 is composed of one or more batteries. In addition, by using a battery as the low-voltage power supply 11, there is also an advantage that it can be easily replaced as needed. Instead of a battery, an AC adapter or the like can also be used as the low-voltage power supply 11.

[0069] The electrostatic spray device 10 further includes a high voltage power supply 12. The high voltage power supply 12 includes a circuit (not shown) connected to the low voltage power supply 11 and boosting the voltage generated by the low voltage power supply 11 to a high voltage. The boosting circuit is generally composed of a transformer, a capacitor, a semiconductor element, and the like.

[0070] The electrostatic spray device 10 also has an auxiliary circuit 13. The auxiliary circuit 13 is present between the above-mentioned low-voltage power supply 11 and the high-voltage power supply 12, and has the function of adjusting the voltage of the low-voltage power supply 11 so that the high-voltage power supply 12 can work stably. The auxiliary circuit 13 also has the function of controlling the speed of the motor possessed by the micro-gear pump 15A described later. By controlling the speed of the motor, the supply amount of the liquid composition from the receiving portion 14 of the liquid composition described later to the micro-gear pump 15A is controlled. A switch SW is installed between the auxiliary circuit 13 and the low-voltage power supply 11, and is configured to enable the electrostatic spray device 10 to operate / stop by opening and closing the switch SW.

[0071] The electrostatic spray device 10 also has a nozzle 15. The nozzle 15 is composed of various conductors represented by metals, and non-conductors such as plastics, rubber, and ceramics, and is in a shape that can spray a liquid composition from its front end. In the nozzle 15, a small space in which the liquid composition circulates is formed along the long side direction of the nozzle 15. From the viewpoint of preventing the clogging of the nozzle 15, the size of the cross section of the small space is expressed in diameter, and its minimum diameter is preferably 100 μm or more and 2000 μm or less, more preferably 100 μm or more and 1400 μm or less, more preferably 250 μm or more and 1400 μm or less, and further preferably 300 μm or more and 1400 μm or less. And from the same viewpoint, the flow path length of the nozzle 15 is preferably 1 mm or more and 25 mm or less, more preferably 1 mm or more and 20 mm or less, more preferably 5 mm or more and 20 mm or less, and more preferably 5 mm or more and 15 mm or less.

[0072] The flow path of the nozzle 15 is at least formed into a tubular shape, and as long as the liquid composition can be ejected, it can also branch on the way of the flow path. In addition, the cross section of the flow path can be a tubular (tubular) shape with almost the same cross-sectional area of ​​the flow path, or it can be a form in which the cross-sectional area of ​​the flow path narrows or widens as it ejects the liquid composition.

[0073] The nozzle 15 is connected to the micro gear pump 15A via a pipe 15B. The pipe 15B can be a conductor or a non-conductor. In addition, the nozzle 15 is electrically connected to the high voltage power supply 12. Thus, a high voltage can be applied to the nozzle 15. In this case, in order to prevent a large current from flowing when the human body is in direct contact with the nozzle 15, the nozzle 15 is electrically connected to the high voltage power supply 12 via a current limiting resistor 19. The nozzle 15 and the high voltage power supply 12 can be electrically connected via a conductor (not shown) such as an electrode.

[0074] The micro gear pump 15A connected to the nozzle 15 via the pipe 15B functions as a supply device for supplying the liquid composition contained in the container 14 to the nozzle 15. The micro gear pump 15A is operated by receiving power supply from the low voltage power supply 11. In addition, the micro gear pump 15A is configured to be controlled by the auxiliary circuit 13 to supply a predetermined amount of the liquid composition to the nozzle 15.

[0075] The container 14 is connected to a micro gear pump 15A via a flexible tube 15C. A liquid composition is contained in the container 14. The container 14 is preferably in a replaceable cartridge form.

[0076] The flow rate of the liquid composition ejected from the nozzle 15 depends on the composition of the liquid composition and the application site of the skin, but is preferably 0.1 mL / h or more, more preferably 0.2 mL / h or more, and even more preferably 0.4 mL / h or more. In addition, the flow rate of the liquid composition ejected from the nozzle 15 is preferably 100 mL / h or less, more preferably 50 mL / h or less, more preferably 30 mL / h or less, further preferably 12 mL / h or less, and further preferably 11.5 mL / h or less. More specifically, the flow rate of the liquid composition ejected from the nozzle 15 is preferably 0.1 mL / h or more and 100 mL / h or less, more preferably 0.2 mL / h or more and 50 mL / h or less, more preferably 0.4 mL / h or more and 30 mL / h or less, further preferably 0.4 mL / h or more and 12 mL / h or less, and further preferably 0.4 mL / h or more and 11.5 mL / h or less. By ejecting the liquid composition at this flow rate, the film-forming property can be improved, and the adhesion between the film and the skin can be improved.

[0077] In addition, from the viewpoint of maintaining the ejection flow rate of the liquid composition in the electrostatic spray process, the voltage applied to the nozzle 15 by the high voltage power supply 12 is preferably 5kV or more, more preferably 9kV or more, and more preferably 10kV or more. In addition, the voltage applied to the nozzle 15 is preferably 50kV or less, and more preferably 30kV or less. More specifically, the voltage applied to the nozzle 15 is preferably 5kV or more and 50kV or less, more preferably 9kV or more and 30kV or less, and more preferably 10kV or more and 30kV or less. The voltage applied to the nozzle 15 can be appropriately selected according to the composition of the liquid composition and the desired speed of ejecting the liquid composition, and preferably a high voltage is applied as the flow rate increases. Among them, the range of the voltage applied to the above-mentioned nozzle 15 is an absolute value, and the applied voltage can be a positive voltage or a negative voltage relative to ground.

[0078] In the case where the liquid composition contains component (c), from the viewpoint of smoothly performing electrostatic spraying and further improving the close fit of the coating to the skin, etc., the speed (flow rate F) of ejecting the liquid composition from the nozzle 15 and the voltage P applied to the nozzle 15 are preferably in a specific relationship with the flow rate and voltage being within the above range as a condition. The ratio (flow rate / voltage) of the ejection speed F (flow rate: mL / h) of the liquid composition relative to the voltage P (kV) applied to the nozzle 15 is preferably 0.8 or less, more preferably 0.6 or less, and its lower limit is preferably 0.06 or more, more preferably 0.1 or more. At this time, the flow rate is preferably 0.2mL / h or more, more preferably 0.4mL / h or more, more preferably 1mL / h or more, and more preferably 2mL / h or more.

[0079] In detail, when a handheld electrostatic spray device is used to electrostatically spray the skin directly, changes in the surrounding environment such as humidity during electrostatic spraying, or changes in the distance between the nozzle and the skin caused by human hands. From the perspective of ensuring the formation of the film on the skin without relying on such variable factors, the relationship between the voltage P (kV) applied to the nozzle 15 and the flow rate F (mL / h) is preferably (1≤F≤0.6P), more preferably (1≤F≤0.5P+2), more preferably (1≤F≤0.3P+2.5), or more preferably (2≤F≤0.5P+2), and even more preferably (2≤F≤0.3P+2.5). The above relationship is supported by the embodiments described below.

[0080] From the viewpoint of taking into account both the operability of the electrostatic spray device 10 and the good ejection of the liquid composition, the volume of the container 14 is preferably 1 mL or more, more preferably 1.5 mL or more, more preferably 3 mL or more, and preferably 25 mL or less, more preferably 20 mL or less, more preferably 15 mL or less. Specifically, the volume of the container 14 is preferably 1 mL or more and 25 mL or less, more preferably 1.5 mL or more and 20 mL or less, more preferably 3 mL or more and 15 mL or less. By having the volume of the container 14 in this range, when the container 14 is in a cassette-type replaceable form, it also has the advantage of being small and thus being able to be replaced more easily.

[0081] Next, refer to Figure 2 to Figure 6 Another embodiment of the electrostatic spray device used in the present invention will be described. Figure 2 to Figure 6 The electrostatic spray device 10 shown in FIG. 1 is similar to the electrostatic spray device 10 in that it has a cartridge portion and a main body portion. Figure 1 The electrostatic spray devices shown vary. Figure 2 to Figure 6 The aspects not specifically described in the embodiments shown in the figure may be appropriately applied to Figure 1 In addition, in Figure 2 to Figure 6 In, with Figure 1 The same components are given the same symbols.

[0082] Figure 2 and Figure 3 The electrostatic spray device 10 of the illustrated embodiment is roughly divided into a box portion 10A and a main body portion 10B. The box portion 10A has a housing portion 14, a gasket 141, a plunger 142 and a nozzle 15. The main body portion 10B includes: a low voltage power supply 11, a high voltage power supply 12, an auxiliary circuit 13, a power source 16 having a DC motor 160 and a motor reducer 161, and a power transmission portion 17 having a screw shaft 171 and a feed screw 172.

[0083] The box part 10A can be loaded and unloaded from the main body 10B. Because of this, the electrostatic spray device 10 of this embodiment can easily refill the liquid composition and maintain the cleanliness of the nozzle 15. As a method in which the box part 10A can be loaded and unloaded from the main body 10B, for example, a method in which a fitting portion is formed on the plunger 142 and the feed screw 172 to fit together, or a method in which a threaded strip is formed on the plunger 142 and the feed screw 172 to screw together, but it is not limited to these methods.

[0084] like Figure 3 As shown, the box part 10A has a cylindrical container 14 that can accommodate a liquid composition. An opening is formed at one end of the container 14. A nozzle 15 is provided at the other end of the container 14. A gasket 141 is arranged inside the container 14. The gasket 141 is formed into a shape having the same contour as the shape of the cross section of the container 14. Thus, the gasket 141 can be in liquid-tight contact with the inner surface of the container 14 and slide inside the container 14. The gasket 141 is combined with the front end of the plunger 142. The plunger 142 extends to the outside of the container 14 over the opening of the container 14. The rear end of the plunger 142 engages with the feed screw 172. The container 14 can be either a conductor or a non-conductor.

[0085] The nozzle 15 of this embodiment is connected to the housing 14. The nozzle 15 is electrically connected to the high voltage power supply 12. Thus, a high voltage can be applied to the nozzle 15. In this case, in order to prevent a large current from flowing when the human body directly contacts the nozzle 15, the nozzle 15 is electrically connected to the high voltage power supply 12 via a current limiting resistor 19. The nozzle 15 and the high voltage power supply 12 may also be electrically connected via a conductor such as an electrode (not shown).

[0086] The above is the description of the cassette portion 10A of the electrostatic spray device 10 according to the present embodiment. The main body portion 10B according to the present embodiment is described below.

[0087] The main body 10B has a low voltage power supply 11. The low voltage power supply 11 is a power supply that can generate a voltage of several V to more than ten V. In order to improve the portability of the electrostatic spray device 10, it is preferred that the low voltage power supply 11 is composed of one or more than two batteries. In addition, by using a battery as the low voltage power supply 11, there is also an advantage that it can be easily replaced as needed. Instead of a battery, an AC adapter or the like can also be used as the low voltage power supply 11.

[0088] The main body 10B further includes a high voltage power supply 12. The high voltage power supply 12 includes a circuit (not shown) connected to the low voltage power supply 11 and boosting the voltage generated by the low voltage power supply 11 to a high voltage. The boosting circuit is generally composed of a transformer, a capacitor, a semiconductor element, and the like.

[0089] The main body 10B also has an auxiliary circuit 13. The auxiliary circuit 13 exists between the low-voltage power supply 11 and the high-voltage power supply 12, and has the function of adjusting the voltage of the low-voltage power supply 11 so that the high-voltage power supply 12 can work stably. The auxiliary circuit 13 also has the function of controlling the rotation speed of the motor possessed by the power source 16 described later. By controlling the rotation speed of the motor, the supply amount of the liquid composition from the container 14 containing the liquid composition to the nozzle 15 that sprays the liquid composition is controlled. A switch SW is installed between the auxiliary circuit 13 and the low-voltage power supply 11, and is configured to enable the electrostatic spray device 10 to operate / stop by opening and closing the switch SW.

[0090] The main body 10B further includes a power source 16 and a power transmission unit 17. The power source 16 generates power to eject the liquid composition contained in the container 14 from the nozzle 15. The power source 16 receives power supply from the low voltage power supply 11 and operates under the control of the auxiliary circuit 13. The power generated by the power source 16 is configured to be transmitted to the box 10A through the power transmission unit 17 to supply a predetermined amount of the liquid composition from the container 14 to the nozzle 15.

[0091] The main body 10B includes: a power source 16 including a DC motor 160 and a motor reducer 161 ; and a power transmission unit 17 including a screw shaft 171 and a feed screw 172 .

[0092] The DC motor 160 is connected to a motor reducer 161 that reduces the rotational power of the DC motor 160 and outputs it. The motor reducer 161 is connected to a rotatable screw shaft 171, and is configured to be a structure in which the rotational power generated by the DC motor 160 is transmitted to the screw shaft 171 via the motor reducer 161, thereby rotating the screw shaft 171. The rotational power transmitted to the screw shaft 171 is converted into a linear power that moves the position of the feed screw 172 along the long side direction X through the feed screw 172 connected to the screw shaft 171. The feed screw 172 that performs linear motion pushes the plunger 142 and the gasket 141 into the container 14, thereby enabling the liquid composition contained in the container 14 to be ejected to the outside through the nozzle 15.

[0093] Figure 3 In the embodiment, the feed screw 172 is separated from the plunger 142 and the plunger 142 is integrated with the gasket 141, but the feed screw 172 is integrated with the plunger 142 and the plunger 142 is separated from the gasket 141. The feed screw 172 is in direct contact with the gasket 141 to transmit linear power to the gasket 141.

[0094] Since the liquid composition used in the present invention has conductivity, the high voltage applied to the nozzle 15 is applied to the liquid composition contained in the container 14 or applied to the power source 16 via the power transmission unit 17, so that the electrostatic spray device 10 is sometimes damaged or the charge leaks and cannot be sprayed. Therefore, from the perspective of ensuring the insulation of the electrostatic spray device 10 during use so that the electrostatic spray device 10 is not damaged, and preventing the current leakage through the liquid composition to ensure the stability of spinning, it is preferred that the power transmission unit 17 electrically insulates the power source 16 from the box 10A. Thus, the phenomenon that the high voltage applied to the nozzle 15 is unintentionally applied to the power source 16 can be effectively prevented. As a method for electrically insulating the power source 16 from the box 10A, for example, a method of using a screw shaft 171 and a feed screw 172 formed of a non-conductor such as plastic or ceramic as the power transmission unit 17 can be cited. As long as the power transmission unit 17 electrically insulates the power source 16 from the box 10A, the gasket 141 and the plunger 142 can be either a conductor or a non-conductor.

[0095] Figure 4 Another embodiment of the electrostatic spray device 10 suitable for use in the present invention is shown. Figure 4 For the aspects not specifically described, the embodiments shown in the drawings may be appropriately applied. Figure 2 and Figure 3 In addition, in Figure 4 In, with Figure 2 and Figure 3 The same components are given the same symbols.

[0096] like Figure 4 As shown, the box part 10A has a storage part 14, a gasket 141 and a nozzle 15. On the other hand, the main body 10B includes: a power source 16 having a linear stepping motor 162; and a power transmission part 17 having a screw shaft 171. By having these structures, the supply amount of the liquid composition from the storage part 14 to the nozzle 15 can be precisely controlled, and the portability of the electrostatic spray device 10 can be further improved due to the miniaturization of the main body 10B.

[0097] The linear stepper motor 162 includes a rotor (not shown) having an internal thread inside the rotor. The screw shaft 171 as an external thread is screwed with the internal thread of the rotor. The linear stepper motor 162 is fixed to a frame (not shown) of the main body 10B. As the rotor in the linear stepper motor 162 rotates, the screw shaft 171 screwed with the internal thread of the rotor moves linearly along the long side direction X. The screw shaft 171 that moves linearly pushes the gasket 141 that contacts one end of the screw shaft 171 into the container 14, thereby allowing the liquid composition contained in the container 14 to be ejected to the outside through the nozzle 15.

[0098] Figure 5 , another embodiment of the electrostatic spray device is shown. The electrostatic spray device 10 shown in the figure is roughly divided into a box part 10A and a main body 10B. The box part 10A has a storage part 14, a nozzle 15 and a pump part 15P. The main body 10B has a low voltage power supply 11, a high voltage power supply 12, an auxiliary circuit 13, a power source 16 and a power transmission part 17.

[0099] The box part 10A can be loaded and unloaded from the main body 10B. Because of this, the electrostatic spray device 10 of this embodiment can easily refill the liquid composition and keep the nozzle 15 clean. As a way in which the box part 10A can be loaded and unloaded from the main body 10B, for example, a method in which a fitting portion is formed in the power transmission part 17 described later and the pump part 15P and the power source 16 are fitted via the power transmission part 17 can be cited, but it is not limited to these methods.

[0100] The receiving part 14 can accommodate the liquid composition and can be loaded and unloaded from the box part 10A. Because of this, the electrostatic spray device 10 of the present embodiment can more easily refill the liquid composition. As the mode in which the receiving part 14 can be loaded and unloaded from the box part 10A, for example, a method in which a fitting part is formed in the receiving part 14 and the pump part 15P and the fitting part is engaged can be cited, but it is not limited to these methods.

[0101] Figure 6In the figure, the box section 10A of the present embodiment is shown. The box section 10A has a bag-shaped receiving section 14. The receiving section 14 is formed into a flat bag shape by overlapping two thin sheets made of liquid-impermeable and flexible materials such as polyethylene and joining them in a liquid-tight manner at their outer edges. Thus, the receiving section 14 has a deformable structure, and a liquid composition can be accommodated inside the receiving section 14. The receiving section 14 has an opening 14a that can be communicated with the pump section 15P in order to supply the liquid composition to the pump section 15P at a part of its outer edge. The receiving section 14 can be a conductor, or it can be a non-conductor.

[0102] The nozzle 15 of the present embodiment is connected to the pump section 15P. In addition, the nozzle 15 is electrically connected to the high voltage power supply 12. Thus, a high voltage can be applied to the nozzle 15. In this case, in order to prevent a large current from flowing when a human body directly contacts the nozzle 15, the nozzle 15 is electrically connected to the high voltage power supply 12 via a current limiting resistor 19. The nozzle 15 and the high voltage power supply 12 may also be electrically connected via a conductor such as an electrode (not shown). The nozzle 15 may also have a pipeline connected to the pump section 15P. The pipeline may be a conductor or a non-conductor.

[0103] The box part 10A has a pump part 15P. The pump part 15P exists between the container 14 and the nozzle 15 and is connected thereto. The pump part 15P has a connection part 15a with the opening part 14a of the container 14. Thus, the liquid tightness of the flow path between the container 14 and the pump part 15P can be maintained, and the liquid composition contained in the container 14 is supplied to the nozzle 15. The pump part 15P is driven by the power of the power source 16 described later, which is transmitted via the power transmission part 17. Figure 6 The pump section 15P shown is also provided with a rotatable power transmission recess 15b, which is used to transmit the power of the power source 16 to the internal components (not shown) such as gears in the pump section 15P via the power transmission section 17. As the pump section 15P, a gear pump or the like can be used from the viewpoint of improving the quantitative spraying of the liquid composition and the viewpoint of improving the mobility of the electrostatic spray device 10. As the gear pump, for example, Figure 1 The micro gear pump and the like described in the embodiment shown.

[0104] Since the liquid tightness of the flow path between the container 14 and the pump 15P is maintained, when the liquid composition is ejected from the container 14 to the nozzle 15 by the operation of the pump 15P, the liquid composition in the container 14 decreases as it is supplied to the nozzle 15, and the internal pressure in the container 14 decreases. As a result, the container 14, which is made of a flexible and deformable material, is deformed in a contracted manner according to the internal pressure.

[0105] The above is the description of the cassette portion 10A of the electrostatic spray device 10 according to the present embodiment. The main body portion 10B of the present embodiment is as follows.

[0106] The main body 10B has a low voltage power supply 11. The low voltage power supply 11 is a power supply that can generate a voltage of several V to more than ten V. In order to improve the portability of the electrostatic spray device 10, it is preferred that the low voltage power supply 11 is composed of one or more than two batteries. In addition, by using a battery as the low voltage power supply 11, there is also an advantage that it can be easily replaced as needed. Instead of a battery, an AC adapter or the like can also be used as the low voltage power supply 11.

[0107] The main body 10B includes a high voltage power supply 12. The high voltage power supply 12 includes a circuit (not shown) connected to the low voltage power supply 11 and boosting the voltage generated by the low voltage power supply 11 to a high voltage. The boosting circuit is generally composed of a transformer, a capacitor, a semiconductor element, and the like.

[0108] The main body 10B has an auxiliary circuit 13. The auxiliary circuit 13 exists between the low-voltage power supply 11 and the high-voltage power supply 12, and has the function of adjusting the voltage of the low-voltage power supply 11 so that the high-voltage power supply 12 can work stably. The auxiliary circuit 13 also has the function of controlling the rotation speed of the motor possessed by the power source 16 described later. By controlling the rotation speed of the motor, the supply amount of the liquid composition from the container 14 containing the liquid composition to the nozzle 15 that sprays the liquid composition via the pump part 15P is controlled. A switch SW is installed between the auxiliary circuit 13 and the low-voltage power supply 11, and is configured to enable the electrostatic spray device 10 to start / stop by opening and closing the switch SW.

[0109] The main body 10B further includes a power source 16 and a power transmission unit 17. The power source 17 of the present embodiment generates power to eject the liquid composition contained in the container 14 from the nozzle 15 via the pump unit 15P. A motor or the like is provided as the power source 16 of the present invention, which receives power supply from the low-voltage power supply 11 and operates under the control of the auxiliary circuit 13 to generate power. The power generated by the power source 16 can be supplied to the nozzle 15 from the container 14 via the pump unit 15P by the power transmission unit 17 that transmits the power to the pump unit 15P.

[0110] The power transmission part 17 of the main body 10B transmits the power generated by the power source 16 such as a motor to the pump part 15P. Thus, the liquid composition contained in the container 14 can be supplied to the nozzle 15 via the pump part 15P. There is no particular limitation on the method of transmitting the power from the power source 16 to the pump part 15P. For example, a convex structure (not shown) can be formed at the front end of the power transmission part 17 composed of an axis, and the convex structure is engaged with the power transmission recess 15b provided in the pump part 15P, thereby transmitting the rotational power of the motor in the power source 16 to the pump part 15P.

[0111] Since the liquid composition used in the present invention has conductivity, the high voltage applied to the nozzle 15 will be applied to the pump part 15P or applied to the power source 16 via the power transmission part 17, so that the electrostatic spray device 10 is sometimes damaged or the charge leaks and cannot be sprayed. Therefore, from the perspective of ensuring the insulation of the electrostatic spray device 10 during use so that the electrostatic spray device 10 is not damaged, and from the perspective of preventing the leakage of current through the liquid composition to ensure the stability of spinning, it is preferred that the power transmission part 17 electrically insulates the power source 16 from the box part 10A. Thus, the phenomenon that the high voltage applied to the nozzle 15 is unintentionally applied to the power source 16 can be effectively prevented. As a method for electrically insulating the power source 16 from the box part 10A, for example, a method of using a component composed of a non-conductor such as plastic or ceramic as the power transmission part 17 can be cited. As long as the power transmission part 17 electrically insulates the power source 16 from the box part 10A, the other constituent materials can be either conductors or non-conductors.

[0112] With the above configuration, the amount of the liquid composition supplied from the container 14 to the nozzle 15 can be precisely controlled, and the portability of the electrostatic spray device 10 can be further improved due to the miniaturization of the main body 10B.

[0113] have Figure 1 to Figure 6 The electrostatic spray device 10 of the embodiment shown in the figure can be used, for example, Figure 7 Use as shown. Figure 7 , a handheld electrostatic spray device 10 having a size that can be held in one hand is shown. The electrostatic spray device 10 shown in the figure Figure 1 , Figure 2 or Figure 5 All the components of the structure shown in the figure are contained in the cylindrical housing 20. Figure 7 The housing 20 shown is cylindrical, but any housing 20 having a size that can be held in one hand and that can accommodate Figure 1The shape of the housing 20 is not particularly limited, and may be an elliptical cylinder or a regular polygonal cylinder. The so-called "size that can be held in one hand" means that the weight of the housing 20 containing the electrostatic spray device 10 is preferably less than 2 kg, the maximum length of the long side of the housing 20 is preferably less than 40 cm, and the volume of the housing 20 is preferably 3000 cm 3 Below. A nozzle (not shown) is arranged at one end 10a in the long side direction of the housing 20. The nozzle is arranged in the housing 20 so that the blowing direction of the liquid composition is consistent with the longitudinal direction of the housing 20 and is convex toward the skin side. By arranging the front end of the nozzle in the longitudinal direction of the housing 20 so as to be convex toward the skin, the liquid composition is not easily attached to the housing, and a film can be stably formed.

[0114] When the electrostatic spray device 10 is in operation, the user, i.e., the person who wants to form a coating on his / her application area through electrostatic spraying, holds the device 10 by hand and directs one end 10a of the device 10 equipped with a nozzle (not shown) toward the application area for electrostatic spraying. Figure 7 , the state in which one end 10a of the electrostatic spray device 10 is directed toward the inner side of the user's forearm is shown. In this state, the switch of the device 10 is turned on to perform the electrostatic spray method. When the device 10 is powered on, an electric field is generated between the nozzle and the skin. Figure 7 In the embodiment shown, a positive high voltage is applied to the nozzle, and the skin becomes a negative electrode. When an electric field is generated between the nozzle and the skin, the liquid composition at the front end of the nozzle is polarized by electrostatic induction so that the front end portion forms a cone, and the droplets of the charged liquid composition are ejected from the front end of the cone along the electric field toward the skin in the air (in the atmosphere). When the component (a) or component (a) and component (c) as a solvent evaporate from the liquid composition ejected into the space, the charge density on the surface of the liquid composition becomes excessive, and the Coulomb repulsion is repeatedly used to refine and diffuse into the space to reach the skin. In this case, by appropriately adjusting the viscosity of the liquid composition, the composition sprayed can be made to arrive at the application site in the state of droplets. Alternatively, it is also possible to volatilize the volatile substance as a solvent from the droplets during the ejection into the space, solidify the polymer with film forming ability as a solute, and use the potential difference to make it elongate and deform, and form fibers, so that the fibers are deposited at the application site. For example, when the viscosity of the liquid composition is increased, the composition is easily deposited in the form of fibers at the application site. Thus, a porous film composed of the deposited fibers is formed on the surface of the application site. The porous film composed of the deposited fibers can also be formed by adjusting the distance between the nozzle and the skin, or by adjusting the voltage applied to the nozzle.

[0115] During the electrostatic spraying process, a high potential difference is generated between the nozzle and the skin. However, due to the very large impedance, the current flowing through the human body is extremely small. For example, the inventors of the present invention have confirmed that the current flowing through the human body during the electrostatic spraying process is several orders of magnitude smaller than the current flowing through the human body due to static electricity generated in normal life.

[0116] In the case of forming a fiber deposit by an electrostatic spray method, the thickness of the fiber is preferably 10 nm or more, more preferably 50 nm or more, when expressed as an equivalent circle diameter. And preferably 3000 nm or less, more preferably 1000 nm or less. The thickness of the fiber can be measured as follows, for example, by observing with a scanning electron microscope (SEM), expanding the fiber 10,000 times for observation, excluding defects (fiber agglomeration, fiber intersection, droplets) from its two-dimensional image, selecting any 10 fibers, drawing a line orthogonal to the long side direction of the fiber, and directly reading the fiber diameter.

[0117] The above-mentioned fibers are infinitely long continuous fibers based on the manufacturing principle, but preferably have a length of at least 100 times the fiber thickness. In this specification, fibers having a length of more than 100 times the fiber thickness are defined as "continuous fibers". In addition, the coating produced by the electrostatic spraying method is preferably a porous discontinuous coating composed of a deposit of continuous fibers. This form of coating is not only handled as an aggregate in the form of a thin sheet, but also has very soft properties. Even if shear force is applied to it, it is not easy to tear, and has the advantage of excellent tracking of body movements. It also has the advantage of excellent diffusion of sweat generated by the skin. Furthermore, it also has the advantage of easy peeling of the coating. In contrast, a continuous coating without pores is not easy to peel off, and the diffusion of sweat is very low, so it is easy to cause stuffiness on the skin.

[0118] The liquid composition that has become fibrous arrives at the application site in a charged state. As described above, since the skin is also charged, the fiber adheres closely to the application site using electrostatic force. The skin surface is formed with fine concave and convex textures such as skin texture, so the fiber further adheres closely to the surface of the application site in coordination with the anchoring effect of the concave and convex. After the electrostatic spraying is completed in this way, the power supply of the electrostatic spraying device 10 is cut off. As a result, the electric field between the nozzle and the skin disappears, and the charge is fixed on the surface of the skin. As a result, the close adhesion of the coating is further exerted.

[0119] As described above, the liquid composition is sprayed in a charged state from the front end of the nozzle of the electrostatic spray device into the air (in the atmosphere). When the ambient humidity is high during the use of electrostatic spraying, the charge leaks due to the moisture in the atmosphere, and the voltage actually applied to the nozzle is lower than the set value. Therefore, the chargeability of the liquid composition decreases, and sometimes the sprayability of the liquid composition decreases. In particular, unlike the techniques of Patent Documents 1 and 2 in which the composition is ejected to form a coating by depositing droplets, in the present invention, continuous fibers are formed by utilizing the Coulomb repulsion of the liquid composition, and such fibers are deposited to form a coating, so when the applied voltage and the chargeability of the liquid composition decrease, it is possible to affect the quality of the formed coating. By making the liquid composition contain component (c), it is possible to make it less susceptible to the humidity of the electrostatic spray.

[0120] The liquid composition of the present invention can prevent the influence of spraying caused by humidity by containing component (c), and make the formed film carry moisture. Specifically, as long as the content of component (c) in the liquid composition is approximately 0.2% by mass or more and the mass ratio (b / c) of component (b) to component (c) is 0.4 or more, not only the close fit between the skin and the film becomes higher, but also the film has a tendency to become transparent, close to the natural appearance. The effect of close fit is further enhanced by performing a liquid application process before or after the electrostatic spray process described later.

[0121] In industrial production where the manufacturing environment of the coating, such as temperature and humidity, is managed, the deviation of the manufacturing environment is small. In contrast, the temperature and humidity of the environment in which a handheld electrostatic spray device such as the present embodiment is used are prone to fluctuations, which results in difficulties in stably forming a coating. However, by including component (d) in addition to component (c) in the liquid composition, the conductivity of the liquid composition is increased. Therefore, even if the manufacturing environment of the coating changes, the liquid composition can be sprayed stably using the electrostatic spray device of the present invention, thereby forming a coating that adheres closely to the skin.

[0122] The above description is about a porous film composed of a deposit of fibers as a film, but the form of the film is not limited thereto, and a continuous film without pores may be formed, or a porous film having a form other than a deposit of fibers may be formed, for example, a porous film in which a plurality of through holes are formed irregularly or regularly in a continuous film, i.e., a discontinuous film. As described above, a film of any shape can be formed by controlling the viscosity of the liquid composition, the distance between the nozzle and the skin, and the voltage applied to the nozzle.

[0123] Although the distance between the nozzle and the skin also depends on the voltage applied to the nozzle, from the viewpoint of smoothly forming a coating, it is preferably 10 mm or more, more preferably 20 mm or more, more preferably 40 mm or more, and even more preferably 60 mm or more. Furthermore, the distance between the nozzle and the skin is preferably 160 mm or less, more preferably 150 mm or less, and even more preferably 120 mm or less. More specifically, the distance between the nozzle and the skin is preferably 10 mm or more and 160 mm or less, more preferably 20 mm or more and 150 mm or less, even more preferably 40 mm or more and 150 mm or less, and even more preferably 60 mm or more and 120 mm or less. The distance between the nozzle and the skin can be measured using a generally used non-contact sensor or the like.

[0124] Regardless of whether the film formed by the electrostatic spraying method is a porous film or not, the basis weight of the film is 2 The skin is preferably 0.05g / m 2 More preferably 0.1 g / m 2 More preferably, 1 g / m 2 And preferably 50g / m 2 Below, more preferably 40g / m 2 Below, more preferably 30g / m 2 Below, more preferably 25g / m 2 Below, more preferably 20g / m 2 For example, the basis weight of the coating is about 1m 2 Skin, preferably 0.05g / m 2 Above 50g / m 2 Below, more preferably 0.1g / m 2 Above 40g / m 2 Below, more preferably 0.1g / m 2 Above 30g / m 2 Below, more preferably 0.1g / m 2 Above 25g / m 2 Below, more preferably 1g / m 2 Above 20g / m 2 By setting the basis weight of the coating film in this way, it is possible to effectively prevent the coating film from peeling off due to excessive thickness of the coating film.

[0125] Regardless of whether the film formed by the electrostatic spraying method is a porous film, from the viewpoint of effectively preventing the film from peeling off, the electrostatic spraying time by the electrostatic spraying method depends on the mixing ratio of the components of the liquid composition and the voltage applied to the nozzle, but it is 2The skin is preferably sprayed for more than 5 seconds, more preferably for more than 10 seconds. In addition, the electrostatic spraying time using the electrostatic spraying method is preferably less than 120 seconds, more preferably less than 60 seconds. Specifically, the electrostatic spraying time using the electrostatic spraying method is preferably more than 5 seconds and less than 120 seconds, more preferably more than 10 seconds and less than 60 seconds.

[0126] In addition, the electrostatic spraying process of directly electrostatically spraying a liquid composition onto the skin to form a film refers to a process of directly electrostatically spraying the skin to form a film. The process of electrostatically spraying a liquid composition onto a place other than the skin to make a sheet composed of fibers and applying or attaching the sheet to the skin is different from the above-mentioned electrostatic spraying process.

[0127] In the present invention, the process of applying cosmetics containing powder to the skin or the film may be included before or after the electrostatic spraying process of forming the film by the electrostatic spraying method, or before or after the electrostatic spraying process. By performing the cosmetics application process before and / or after the process of forming a porous film composed of an accumulation of fibers in the electrostatic spraying process, even if the area where the cosmetics containing powder are applied to the skin or the film (hereinafter, this area is also referred to as the "cosmetics application area") rubs against clothing, the cosmetics can be prevented from staining or adhering to clothing. In contrast, the techniques described in Patent Documents 1 and 2 described in the above-mentioned background technology section only disclose the direct formation of a foundation film on the skin surface by the electrostatic spraying method, and there is no treatment for protecting the formed foundation film.

[0128] In the present invention, in particular, it is preferred to form a film by applying a liquid composition on the cosmetic application site, thereby covering the surface of the cosmetic and protecting the cosmetic. That is, it is preferred to have an electrostatic spraying process for forming a film by the above-mentioned electrostatic spraying method after the cosmetic application process. Furthermore, from the viewpoint of reliably preventing the staining and adhesion of cosmetics to objects such as clothing in contact with the skin and maintaining the cosmetics on the skin, it is preferred to form a film on the entire area of ​​the cosmetic application site. However, depending on the situation, the film may be formed only on a portion of the site where the cosmetics are applied. Alternatively, the film may be formed in a manner that spans both the cosmetic application site and the site where the cosmetics are not applied.

[0129] As cosmetics, there are external preparations that have good effects on the skin, such as color cosmetics, UV cosmetics, and beauty essences. As color cosmetics, there are base makeup, lip cosmetics, makeup base, BB cream, CC cream, etc. As base makeup, there are foundation, concealer, and makeup powder. Base makeup contains coloring pigments, extender pigments, etc., and its dosage form is, for example, liquid, gel, emulsion, or solid, which does not constitute an essential difference.

[0130] The content of powder in cosmetics varies according to its purpose. From the perspective of improving the close fit between the film formed by the electrostatic spray method and the skin, it is preferably 0.1% by mass or more, preferably 100% by mass or less, and more preferably 95% by mass or less. In addition, in the present invention, from the perspective of providing better effects on the skin of color cosmetics, UV cosmetics, beauty essences, etc., the powder is preferably a coloring pigment or a pearlescent pigment. In the present invention, the so-called coloring pigment refers to a colored pigment and a white pigment. From the same perspective, the average particle size of the coloring pigment is preferably 0.1 μm or more, more preferably more than 0.1 μm, preferably less than 20 μm, and more preferably less than 15 μm. Among them, the average particle size is the number average particle size measured using a laser diffraction / scattering particle size distribution measuring device LA-910 (manufactured by Horiba, Ltd.).

[0131] The coloring pigment and extender pigment contained in the base makeup cosmetics are not limited as long as they are pigments that can be used in general cosmetics. For example, inorganic powders such as silicic acid, anhydrous silicic acid, magnesium silicate, talc, sericite, mica, kaolin, iron oxide, clay, bentonite, mica, titanium-coated mica, bismuth oxychloride, zirconium oxide, magnesium oxide, titanium oxide, zinc oxide, aluminum oxide, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, iron oxide, ultramarine, chromium oxide, chromium hydroxide, calamine, carbon black, boron nitride, and composites thereof; organic powders such as polyamide, nylon, polyester, polypropylene, polystyrene, polyurethane, vinyl resin, urea resin, phenolic resin, fluororesin, silicone resin, acrylic resin, melamine resin, epoxy resin, polycarbonate resin, divinylbenzene-styrene copolymer, silk powder, cellulose, long-chain alkyl phosphate metal salt, N-single long-chain alkyl acyl basic amino acid, and composites thereof; and composite powders of the above-mentioned inorganic powders and the above-mentioned organic powders. These extender pigments and coloring pigments are colored or non-colored (e.g., white or essentially transparent) and can provide one or more effects such as coloring, light diffraction, oil absorption, translucency, opacity, gloss, matte appearance, smoothness, etc. to the composition or skin.

[0132] Furthermore, the coloring pigment and extender pigment contained in the cosmetic of the present invention are not limited as long as they can be used in ordinary cosmetics. For example, inorganic powders such as silicic acid, anhydrous silicic acid, magnesium silicate, talc, sericite, mica, kaolin, red iron, clay, bentonite, mica, titanium-coated mica, bismuth oxychloride, zirconium oxide, magnesium oxide, titanium oxide, zinc oxide, aluminum oxide, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, iron oxide, ultramarine, chromium oxide, chromium hydroxide, calamine, carbon black, boron nitride, and composites thereof; organic powders such as polyamide, nylon, polyester, polypropylene, polystyrene, polyurethane, vinyl resin, urea resin, phenolic resin, fluororesin, silicone resin, acrylic resin, melamine resin, epoxy resin, polycarbonate resin, divinylbenzene·styrene copolymer, silk powder, cellulose, long-chain alkyl phosphate metal salt, N-single long-chain alkyl acyl basic amino acid, and composites thereof; and composite powders of the above-mentioned inorganic powders and the above-mentioned organic powders. These extender pigments and coloring pigments can be colored or non-colored (e.g., white or essentially transparent) and can provide one or more effects such as coloring, light diffraction, oil absorption, translucency, opacity, gloss, matte appearance, smoothness, etc. to the composition or skin.

[0133] In addition, from the viewpoint of being able to effectively prevent adhesion to clothes, the cosmetics are preferably those containing coloring pigments and pearlescent pigments. Examples of such coloring pigments include inorganic pigments such as titanium oxide, zinc oxide, yellow iron oxide, red iron oxide, black iron oxide, carbon black, ultramarine, cyan, cyan titanium oxide, black titanium oxide, chromium oxide, chromium hydroxide, and titanium·titanium oxide sintered products; organic pigments such as Red No. 201, Red No. 202, Red No. 226, Yellow No. 401, and Cyan No. 404; lake pigments such as Red No. 104, Red No. 230, Yellow No. 4, Yellow No. 5, and Cyan No. 1; and substances obtained by coating organic pigments with polymers such as polymethacrylates. In addition, examples of pearlescent pigments include titanium mica, red iron coated mica, bismuth oxychloride, titanium oxide coated bismuth oxychloride, iron oxide coated titanium mica, organic pigment coated titanium mica, silicate titanium treated mica, titanium oxide coated talc, silica red iron treated aluminum, titanium oxide coated glass powder and other inorganic powders, and those obtained by coating the surface of flaky aluminum with an organic resin such as polyethylene terephthalate, etc. In addition, from the viewpoint of durability against sweat and sebum, pigments surface-treated with fluorine compounds or silicone compounds may be used as these coloring pigments, extender pigments, and pearlescent pigments.

[0134] In addition, from the viewpoint of being able to effectively prevent adhesion to clothes, cosmetics containing coloring pigments and pearlescent pigments are preferred. Examples of such coloring pigments include inorganic white pigments such as titanium oxide and zinc oxide, yellow iron oxide, red iron oxide, black iron oxide, carbon black, ultramarine, cyan, cyan titanium oxide, black titanium oxide, chromium oxide, chromium hydroxide, titanium·titanium oxide sintered products and the like; organic pigments such as Red No. 201, Red No. 202, Red No. 226, Yellow No. 401, and Cyan No. 404; lake pigments such as Red No. 104, Red No. 230, Yellow No. 4, Yellow No. 5, and Cyan No. 1; and substances obtained by coating organic pigments with polymers such as polymethacrylates. In addition, examples of pearlescent pigments include inorganic powders such as mica titanium, red iron coated (titanium oxide·aluminum hydroxide) mixture, red iron coated mica, bismuth oxychloride, titanium oxide coated bismuth oxychloride, iron oxide coated mica titanium, organic pigment coated mica titanium, silicate·titanium treated mica, titanium oxide coated talc, silica·red iron treated aluminum, titanium oxide coated glass powder, and a material obtained by coating the surface of flaky aluminum with an organic resin such as polyethylene terephthalate, titanium oxide·iron oxide yellow·red iron / lauryl methacrylate·ethylene dimethacrylate copolymer mixture, and the like.

[0135] Wherein, by at least including titanium oxide, yellow iron oxide, red iron oxide, and black iron oxide as coloring pigments, it is possible to make the coloring effect excellent and effectively prevent the adhesion to clothes. In addition, as these coloring pigments and pearlescent pigments, from the viewpoint of the persistence of sweat and sebum, it is also possible to use them after hydrophobization treatment. As hydrophobization treatment, it is preferably fluorine compound treatment, silicone compound treatment, alkyl treatment, alkyl silane treatment, metal soap treatment, water-soluble polymer treatment, amino acid treatment, N-acyl amino acid treatment, lecithin treatment, organic titanate treatment, polyol treatment, acrylic resin treatment, methacrylic resin treatment, polyurethane resin treatment, etc. The surface treatment, wherein, more preferably the pigment after surface treatment using fluorine compound and silicone compound.

[0136] Coloring pigments and pearlescent pigments can be used in one or more kinds. From the viewpoint of effectively preventing adhesion to clothes, the content is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and more preferably 1% by mass or more, preferably 40% by mass or less, more preferably 30% by mass or less, and more preferably 25% by mass or less. In addition, the coloring pigments and pearlescent pigments are preferably 0.1-40% by mass, more preferably 0.5-30% by mass, and more preferably 1-25% by mass in the whole composition.

[0137] In addition, color cosmetics may contain oils that are liquid at 25° C. or waxes that are solid at 25° C. in addition to powders such as coloring pigments and extender pigments. Furthermore, color cosmetics may appropriately contain common ingredients such as thickeners, film-forming agents, surfactants, sugars, polyols, water-soluble polymers, metal ion blockers, lower alcohols, amino acids, organic amines, pH adjusters, skin conditioners, vitamins, antioxidants, fragrances, and preservatives, within a range that does not impair the effects of the present invention.

[0138] As UV cosmetics, it is preferred to contain ingredients with UV protection such as UV absorbers and UV scatterers. As UV absorbers, for example, it is preferred to be selected from benzophenone derivatives such as dihydroxybenzophenone, dihydroxydimethoxybenzophenone, hydroxymethoxybenzophenone sulfonate, dihydroxydimethoxybenzophenone disulfonate, and methoxycinnamic acid derivatives such as 2-ethylhexyl methoxycinnamate, and one or more organic UV absorbers, more preferably 2-ethylhexyl methoxycinnamate. As UV scatterers, for example, zinc oxide, titanium oxide, and silicon dioxide composed of microparticles with an average particle size of less than 0.1 μm can be cited. In addition, cosmetics other than the cosmetics of the present invention can be applied to the skin before or after the cosmetics of the present invention are applied to the skin.

[0139] In the present invention, instead of the above-mentioned cosmetic application step, before or after the electrostatic spraying step of forming a film on the skin by electrostatic spraying, or before or after it, a liquid application step of applying a liquid selected from water, a polyol that is liquid at 20°C, and an oil that is liquid at 20°C, which is different from the above-mentioned liquid composition, to the skin or the film can be performed. By performing the liquid application step, the film formed in the electrostatic spraying step is easy to merge with the skin, and the film can be highly closely attached to the skin and can also be transparent. For example, it is not easy to have a height difference between the end of the film and the skin, thereby improving the close fit of the film to the skin. As a result, it is not easy to peel off or break the film. In addition, the color of the makeup cosmetics is not easy to be hidden, and a more natural appearance can be presented, and the existence of the film is not easy to be identified. As a more preferred embodiment, when the film is a porous film composed of a deposit of fibers, although the porosity is high, the close fit with the skin is also high, and it is easy to generate a large capillary force. Furthermore, when the fibers are fine, it is easy to increase the specific surface area of ​​the porous film. The liquid agent application step can also be performed by applying the liquid agent to the skin or the film by electrostatic spraying, but from the perspective of simplicity, as described later, it is preferred to apply the liquid agent to the skin or the film by a method other than electrostatic spraying such as hand application.

[0140] In particular, after a porous coating composed of a deposit of fibers is formed in the electrostatic spraying process, a liquid agent application process is performed to form a liquid agent-carrying coating in which the liquid agent is present between the fibers forming the porous coating and / or on the fiber surface. As a result, the close fit of the coating is improved, and the transparency of the coating when visually observed is maintained or improved. In particular, when the coating is colorless and transparent or colored and transparent, it becomes more difficult to identify the coating, thereby being able to present an effect that looks like natural skin. In addition, when the coating is colored and transparent, since the coating exhibits a sense of transparency, it can be made to look like a part of the skin.

[0141] When the liquid agent used in the liquid agent application step contains water, examples of the liquid agent include liquids such as water, aqueous solutions and aqueous dispersions, gel-like substances thickened with a thickener, polar oils, oil agents containing 10% by mass or more of polar oils, and emulsions containing polar oils (O / W emulsions, W / O emulsions).

[0142] When the liquid used in the liquid application step contains a polyol that is liquid at 20°C, examples of the polyol 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 having a weight average molecular weight of 2000 or less; glycerols such as glycerol, diglycerol, and triglycerol. Among these, from the viewpoint of the feel of use such as smoothness during coating, ethylene glycol, propylene glycol, 1,3-butanediol, dipropylene glycol, polyethylene glycol having a weight average molecular weight of 2000 or less, glycerol, and diglycerol are preferred, propylene glycol, 1,3-butanediol, and glycerol are more preferred, and propylene glycol and 1,3-butanediol are still more preferred.

[0143] On the other hand, when the liquid used in the liquid application process contains an oil that is liquid at 20°C (hereinafter, the oil is also referred to as "liquid oil"), examples of the oil that is liquid at 20°C include: straight-chain or branched hydrocarbon oils such as liquid paraffin, light isoparaffin, liquid isoparaffin, squalane, and squalene; ester oils such as monoalcohol fatty acid esters, polyol fatty acid esters, and triglycerol fatty acid esters; silicone oils such as dimethylpolysiloxane, dimethylcyclopolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, and higher alcohol-modified organopolysiloxane. Among these, polar oils such as hydrocarbon oils, ester oils, and silicone oils are preferred from the perspective of the feel of use such as smoothness during coating, and hydrocarbon oils and ester oils are more preferred. In addition, one or more of the liquid oils selected from these can be used in combination.

[0144] As the above-mentioned hydrocarbon oil, liquid paraffin, squalane, squalene, n-octane, n-heptane, cyclohexane, light isoparaffin, liquid isoparaffin, etc. can be listed. From the perspective of the feeling of use, liquid paraffin and squalane are preferred. In addition, from the perspective of making the electrostatically sprayed film closely adhere to the skin, the viscosity of the hydrocarbon oil at 30°C is preferably 10mPa·s or more, and more preferably 30mPa·s or more. From the above viewpoints, the total content of isododecane, isohexadecane, and hydrogenated polyisobutene having a viscosity of less than 10mPa·s at 30°C in the liquid is preferably 10% by mass or less, more preferably 5% by mass or less, more preferably 1% by mass or less, and even more preferably 0.5% by mass or less, or it may not be contained.

[0145] Similarly, from the viewpoint of making the electrostatically sprayed coating closely adhere to the skin, the viscosity of the ester oil and the silicone oil at 30° C. is preferably 10 mPa·s or more, more preferably 30 mPa·s or more.

[0146] The viscosity here is measured at 30° C. using a BM type viscometer (manufactured by TOKIMEC Corporation, measurement conditions: rotor No. 1, 60 rpm, 1 minute).

[0147] From the same viewpoint, the total content of ether oils such as cetyl-1,3-dimethylbutyl ether, dioctyl ether, dilauryl ether and diisostearyl ether in the liquid is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 1% by mass or less.

[0148] In addition, as the liquid oil, polar oils that are liquid at 20° C. can also be preferably used, and examples thereof include ester oils, vegetable oils (triglycerides) containing ester oils, higher alcohols of branched fatty acids or unsaturated fatty acids, preservatives, silicone oils, etc. These liquid oils can be used alone or in combination of two or more.

[0149] Examples of the ester oil include esters composed of a straight-chain or branched fatty acid and a straight-chain or branched alcohol or a polyol, and triglycerol fatty acid esters (triglycerides). Specifically, examples include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearyl acid, ethylene di(2-ethylhexanoate), dipentaerythritol fat. Acid ester, monoisostearate N-alkyl glycol ester, neopentyl glycol dicaprate, diisostearyl malate, di(2-heptyl undecanoic acid) glyceryl, trimethylolpropane tri(2-ethylhexanoate), trimethylolpropane triisostearate, pentaerythritol tetra-2-(ethylhexanoate), tri-2-(ethylhexanoic acid) glyceryl, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, diethylhexyl naphthalene dicarboxylate Esters, benzoic acid (carbon number 12-15) alkyl esters, cetearyl isononanoate, tri(caprylic acid / capric acid) glyceryl, (dicaprylic acid / capric acid) butylene glycol ester, trilaurin, trimyristin, tripalmitin, triisostearin, tri(2-heptylundecanoic acid) glyceryl, tribehenin, tricoconut fatty acid glyceryl, castor oil fatty acid methyl ester, oleyl oleate, palmitic acid-2-heptylundecanoate, hexyl diisobutyl diacid, 2-octyldodecyl N-lauroyl-L-glutamate, di(2-heptylundecyI) adipate, ethyl laurate, di(2-ethylhexyl sebacate), 2-hexyldecyl myristic acid, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, di(2-ethylhexyl) succinate, triethyl citrate, 2-ethylhexyl p-methoxycinnamate, tripropylene glycol dipivalate, and the like.

[0150] Among these, from the viewpoint of making the electrostatically sprayed film closely adhere to the skin and the aspect of excellent feeling when applied to the skin, preferably selected from 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, benzoic acid (carbonyl) The present invention further comprises at least one selected from the group consisting of isopropyl myristate, isopropyl palmitate, diisostearyl malate, neopentyl glycol dicaprate, benzoic acid (carbon number 12 to 15) alkyl esters, and tri(caprylic acid capric acid) glyceryl, and more preferably at least one selected from the group consisting of neopentyl glycol dicaprate, benzoic acid (carbon number 12 to 15) alkyl esters, and tri(caprylic acid capric acid) glyceryl.

[0151] The triglyceride is preferably a fatty acid triglyceride, which is contained in, for example, olive oil, jojoba oil, macadamia oil, meadowfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, bitter almond oil, rice germ oil, rice bran oil, and the like.

[0152] Examples of the higher alcohol include liquid higher alcohols having 12 to 20 carbon atoms, and specific examples thereof include isostearyl alcohol and oleyl alcohol.

[0153] Examples of the preservative include phenoxyethanol, methyl parahydroxybenzoate, ethyl parahydroxybenzoate, isobutyl parahydroxybenzoate, isopropyl parahydroxybenzoate, ethyl parahydroxybenzoate, butyl parahydroxybenzoate, propyl parahydroxybenzoate, benzyl parahydroxybenzoate, and ethyl hexanediol.

[0154] Examples of the silicone oil include dimethylpolysiloxane, dimethylcyclopolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, and higher alcohol-modified organopolysiloxane.

[0155] From the viewpoint of making the electrostatically sprayed coating adhere closely to the skin, the kinematic viscosity of the silicone oil at 25°C is preferably 3 mm 2 / s or more, more preferably 4mm 2 / s or more, more preferably 5mm 2 / s or more, preferably 30mm 2 / s or less, more preferably 20mm 2 / s or less, more preferably 10mm 2 / s or less.

[0156] Among these, dimethylpolysiloxane is preferably contained from the viewpoint of making the electrostatically sprayed film adhere closely to the skin.

[0157] The liquid agent preferably contains liquid oil, and the content of the liquid oil in the liquid agent is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 5% by mass or more. And, preferably 100% by mass or less. The content of the liquid oil in the liquid agent is preferably 0.1% by mass or more and 100% by mass or less, and more preferably 0.5% by mass or more and 100% by mass or less.

[0158] In particular, when the liquid contains polar oil, from the viewpoint of improving the close adhesion between the film and the skin, the liquid preferably contains water and polar oil, and preferably contains water and polar oil in a total amount of 40% by mass or more and 100% by mass or less. In addition, from the viewpoint of stability, the liquid may contain a surfactant, a polymer, a thickener, and from the viewpoint of improving the close adhesion between the film and the skin and the moisturizing performance of the film, it may contain an oil agent that is solid at 30°C, such as vaseline, cetyl alcohol, stearyl alcohol, ceramide, etc.

[0159] Similarly, when the liquid contains a polyol, from the viewpoint of improving the close adhesion between the film and the skin, the liquid preferably contains water and a polyol, preferably the water and the polyol are contained in a total amount of 40% by mass or more and 100% by mass or less. In addition, from the viewpoint of stability, the liquid may contain a surfactant, a polymer, a thickener, and from the viewpoint of improving the close adhesion between the film and the skin and the moisturizing performance of the film, it may contain an oil agent that is solid at 30°C, such as vaseline, cetyl alcohol, stearyl alcohol, ceramide, etc.

[0160] Even when water, a polyol that is liquid at 20° C., or a liquid oil is used as the liquid, it is preferred that the liquid have a viscosity of about 5000 mPa·s or less at 25° C. from the perspective of improving the close adhesion between the film formed by the electrostatic spraying method and the cosmetic application site. The method for measuring the viscosity of the liquid is as described above.

[0161] In addition, from the perspective of improving the close adhesion of the film formed by the electrostatic spraying method to the skin, the content of the coloring pigment in the liquid is preferably less than 0.1% by mass, more preferably 0.05% by mass or less, preferably 0.01% by mass or less, and preferably 0.001% by mass or less. In the present invention, the so-called coloring pigment means that transparent pigment is not included, and white pigment is included in the coloring pigment.

[0162] Various methods can be used when a liquid containing water, polyol or liquid oil is applied to the skin. For example, by including the process of applying the liquid to the skin and applying and extending the liquid by methods such as dripping and spraying, it is integrated into the skin or the coating, so that a thin layer of the liquid can be formed. The process of applying and extending the liquid can be adopted, for example, by the user's own fingers or by using tools such as applicators to wipe. The liquid can also be only dripped or sprayed, but by including the process of coating and extending, it can be integrated into the skin or the coating, and the close fit of the coating can be fully improved. As another method, the liquid can also be sprayed on the skin to form a thin layer of the liquid. In this case, it is not particularly necessary to apply and extend separately, but it is also okay to apply and extend after spraying. In addition, when the liquid is applied after the formation of the coating, sufficient liquid is applied to the skin, and the excess liquid is removed by the process of contacting the sheet with the scope of applying the liquid.

[0163] The amount of the liquid agent applied to the skin is sufficient to improve the close adhesion between the skin and the film. In the case where the liquid agent contains liquid oil, the amount of the liquid agent applied to the skin is set to a base weight of the liquid oil per 1 m 2 The skin is preferably 0.1 g / m 2 More preferably, it is 0.2 g / m 2 The above amount is preferably set to 40g / m 2 Below, more preferably 35g / m 2 For example, the amount of liquid applied to the skin is set so that the basis weight of the liquid oil is 1 m 2 The skin is preferably 0.1 g / m 2 Above 40g / m 2 Below, more preferably 0.2g / m 2 Above 35g / m 2 The following amount.

[0164] In addition, from the viewpoint of improving the close adhesion between the skin and the membrane and improving the transparency, the amount of the liquid agent applied to the skin or the membrane is preferably 5 g / m 2 More preferably 10 g / m 2 More preferably, 15 g / m 2 Above, preferably 50g / m 2 Below, more preferably 45g / m 2 the following.

[0165] Furthermore, before or after applying the above-mentioned liquid preparation to the skin, a cosmetic product other than the above-mentioned liquid preparation may be applied to the skin.

[0166] In addition, in the present invention, both the cosmetic application process and the liquid application process can be performed before or after the electrostatic spray process of forming a film on the skin by the above-mentioned electrostatic spray, or before and after it. In this case, the order of each process is not particularly limited, and it is preferred to include the electrostatic spray process after the cosmetic application process, and then include the liquid application process after the electrostatic spray process. By forming a film in this process sequence, it is possible to effectively prevent the staining and adhesion of cosmetics to clothing and the like caused by rubbing of the cosmetic application site, and the film formed in the electrostatic spray process is easy to merge with the cosmetic application site, and the film can be highly closely fitted to the skin and can also be transparent. In addition, it is not easy to produce a height difference between the end of the film and the skin, thereby improving the close fit of the film to the skin. As a result, it is not easy for the film to peel off, break, etc. to occur. Furthermore, the color of the makeup cosmetics is not easy to be hidden, presenting a more natural appearance, making it difficult to identify the existence of the film.

[0167] The above-mentioned method for manufacturing the film is useful as various cosmetic methods that do not target human body surgery, treatment or diagnosis. For example, the method for manufacturing the film of the present invention can be used for skin whitening, concealing skin spots, concealing skin dullness and dark circles, concealing skin wrinkles, skin haloes, protecting the skin from ultraviolet damage, and moisturizing the skin at the application site for cosmetic purposes. In addition, the method for manufacturing the film of the present invention can also be used in various actions for skin protection performed by individuals at home, such as protection from various injuries such as abrasions, cuts, lacerations, and punctures, and prevention of bedsores.

[0168] The present invention has been described above based on its preferred embodiment, but the present invention is not limited to the above embodiment. For example, in the above embodiment, the person who wants to form a film on his / her skin holds the electrostatic spray device 10 to generate an electric field between the conductive nozzle of the device 10 and the skin of the person, but as long as an electric field is generated between the two, it is not necessary for the person who wants to form a film on his / her skin to hold the electrostatic spray device 10.

[0169] Regarding the above-mentioned embodiment, the present invention further discloses the following method for producing a coating film.

[0170] <1>

[0171] A method for manufacturing a coating, wherein:

[0172] The method for producing the coating comprises: an electrostatic spraying step of directly electrostatically spraying a liquid composition onto the skin surface using an electrostatic spray device to form a coating on the skin, wherein the electrostatic spray device has:

[0173] a container capable of containing the liquid composition;

[0174] a nozzle for ejecting the liquid composition; and

[0175] A power source for applying voltage to the nozzle,

[0176] The liquid composition contains the following components (a), (b) and (c),

[0177] (a) one or more volatile substances selected from alcohols and ketones,

[0178] (b) a water-insoluble polymer having film-forming ability,

[0179] (c) 0.2% to 25% by mass of water,

[0180] The electrostatic spraying step is a step of using the power supply to apply a voltage of 5 kV to 50 kV to the nozzle to spray the liquid composition at a flow rate of 0.4 mL / h to 30 mL / h, thereby electrostatically spraying the skin surface, wherein the ratio of the flow rate F (mL / h) to the voltage P (kV) (flow rate F / voltage P) is less than 0.8.

[0181] <2>

[0182] The method for producing a coating according to <1>, wherein the viscosity of the liquid composition at 25° C. is 5 mPa·s to 3000 mPa·s.

[0183] <3>

[0184] The method for producing a coating as described in <1> or <2> above, wherein the component (b) is at least one selected from partially saponified polyvinyl alcohol, low-saponified polyvinyl alcohol, completely saponified polyvinyl alcohol, polyvinyl butyral resin, polymethacrylic acid resin, polyvinyl acetal diethylaminoacetate, oxazoline-modified silicone, and polylactic acid.

[0185] <4>

[0186] The method for producing a coating according to any one of <1> to <3>, wherein the content of the component (b) in the liquid composition is 2% by mass or more and 20% by mass or less.

[0187] <5>

[0188] The method for producing a coating according to any one of <1> to <4>, wherein the content mass ratio (b / c) of the component (b) to the component (c) is 0.4 to 50.

[0189] <6>

[0190] The method for producing a coating according to any one of <1> to <5>, wherein in the electrostatic spraying step, the distance between the nozzle and the skin is set to 10 mm to 160 mm.

[0191] <7>

[0192] The method for producing a coating according to any one of <1> to <6>, wherein the electrical conductivity of the liquid composition at 25° C. is 8 μS / cm to 260 μS / cm.

[0193] <8>

[0194] The method for producing a coating according to any one of <1> to <7>, wherein in the electrostatic spraying step, the basis weight of the coating is 2 Skin: 0.05g / m 2 Above 50g / m 2 the following.

[0195] <9>

[0196] The method for producing a coating according to any one of <1> to <8>, wherein in the electrostatic spraying step, the liquid composition is electrostatically sprayed onto the skin to form a porous coating composed of deposited fibers.

[0197] <10>

[0198] The method for manufacturing a coating as described in any one of <1> to <9> above comprises: the electrostatic spraying step; and a liquid application step of applying a liquid different from the liquid composition to the skin, containing one or more selected from water, a polyol and an oil that is liquid at 20°C.

[0199] <11>

[0200] The method for producing a coating according to <10>, wherein:

[0201] In the electrostatic spraying step, a porous film consisting of fiber deposits is formed.

[0202] Next, in the liquid agent applying step, the liquid agent is applied onto the porous film to form a liquid agent-supported film in which the liquid agent is present between fibers constituting the porous film and / or on the fiber surfaces.

[0203] <12>

[0204] The method for producing a coating according to <10> or <11>, wherein in the liquid agent applying step, the liquid agent is applied to the coating so as to maintain the transparency of the coating.

[0205] <13>

[0206] The method for producing a coating according to any one of <1> to <12>, further comprising: a cosmetic application step of applying a cosmetic containing powder to a skin surface, and the electrostatic spraying step is performed after the cosmetic application step.

[0207] <14>

[0208] In the method for producing a coating according to any one of <1> to <13>, the electrostatic spray device further includes a housing that accommodates the housing portion, the nozzle, and the power source and is holdable with one hand.

[0209] <15>

[0210] The method for producing a coating according to any one of <1> to <14>, wherein:

[0211] The electrostatic spray device comprises a box portion and a main body portion.

[0212] The cartridge has: the housing; a gasket capable of sliding along the inner surface of the housing; and a nozzle for ejecting the liquid composition from the housing.

[0213] The main body has: a power source for ejecting the liquid composition; and a power transmission unit for transmitting power from the power source to the box.

[0214] The power transmission part electrically insulates the power source from the box part.

[0215] The cassette portion is detachable from the main body portion.

[0216] <16>

[0217] The method for producing a coating according to any one of <1> to <14>, wherein:

[0218] The electrostatic spray device comprises a box portion and a main body portion.

[0219] The cartridge has: a container capable of containing the liquid composition and capable of deforming according to internal pressure; the nozzle; and a pump unit for supplying the liquid composition contained in the container to the nozzle.

[0220] The main body has: a power source that ejects the liquid composition by driving the pump; and a power transmission unit that transmits power from the power source to the pump.

[0221] The power transmission part electrically insulates the power source from the box part.

[0222] The cassette portion is detachable from the main body portion.

[0223] <17>

[0224] In the method for producing a coating according to <16>, the housing portion is detachable from the cassette portion.

[0225] <18>

[0226] The method for producing a coating according to any one of <15> to <17>, wherein the volume of the housing is 1 mL to 20 mL.

[0227] <19>

[0228] In the method for producing a coating according to any one of <1> to <18>, a size of a cross section of the micro space of the nozzle is not less than 100 μm and not more than 1400 μm.

[0229] <20>

[0230] The method for producing a coating according to any one of <1> to <19>, wherein a flow path length of the nozzle is 1 mm to 25 mm.

[0231] <21>

[0232] The method for manufacturing a coating as described in any one of <1> to <20> above, wherein the electrostatic spraying step is a step of applying a voltage of not less than 9 kV and not more than 30 kV to the nozzle using the power supply in a manner such that the ratio of the flow rate F (mL / h) to the voltage P (kV) (flow rate F / voltage P) is not less than 0.06 and not more than 0.6, thereby ejecting the liquid composition at a flow rate of not less than 0.4 mL / h and not more than 12 mL / h, thereby electrostatically spraying the skin surface.

[0233] <22>

[0234] The method for manufacturing a coating as described in any one of <1> to <20> above, wherein the electrostatic spraying step is a step of applying a voltage of 9 kV to 30 kV to the nozzle using the power supply in a manner such that the relationship between the voltage P (kV) and the flow rate F (mL / h) becomes (1≤F≤0.3P+2.5) to spray the liquid composition, thereby electrostatically spraying the skin surface.

[0235] <23>

[0236] A method for manufacturing a coating, wherein:

[0237] The method for producing the coating comprises: an electrostatic spraying step of directly electrostatically spraying a liquid composition onto the skin surface using an electrostatic spray device to form a coating on the skin;

[0238] The electrostatic spray device comprises a box portion and a main body portion.

[0239] The cartridge has: a container capable of accommodating the liquid composition; a gasket capable of sliding along the inner surface of the container; and a nozzle for ejecting the liquid composition from the container.

[0240] The main body has: a power source for ejecting the liquid composition; and a power transmission unit for transmitting power from the power source to the box.

[0241] The power transmission part electrically insulates the power source from the box part.

[0242] The liquid composition contains the following components (a) and (b),

[0243] (a) one or more volatile substances selected from alcohols and ketones;

[0244] (b) A polymer having film-forming ability.

[0245] <24>

[0246] The method for producing a coating according to <23>, wherein:

[0247] The liquid composition further contains water as component (c).

[0248] The content mass ratio (b / c) of the component (b) to the component (c) is 0.4 or more and 140 or less.

[0249] <25>

[0250] In the method for producing a coating according to <23> or <24>, the cassette section is detachable from the main body section.

[0251] <26>

[0252] The method for producing a coating according to any one of <23> to <25>, wherein in the electrostatic spraying step, the liquid composition is electrostatically sprayed onto the skin to form a porous coating composed of deposited fibers.

[0253] <27>

[0254] The method for manufacturing the coating described in any one of <23> to <26> above comprises: the above-mentioned electrostatic spraying step; and a liquid application step of applying a liquid different from the above-mentioned liquid composition to the skin, containing one or more selected from water, a polyol and an oil that is liquid at 20°C.

[0255] <28>

[0256] The method for producing a coating according to <27>, wherein:

[0257] In the electrostatic spraying step, a porous film consisting of fiber deposits is formed.

[0258] Next, in the liquid agent applying step, the liquid agent is applied onto the porous film to form a liquid agent-supported film in which the liquid agent is present between fibers constituting the porous film and / or on the fiber surfaces.

[0259] <29>

[0260] The method for producing a coating according to <27> or <28>, wherein in the liquid agent applying step, the liquid agent is applied to the coating so as to maintain the transparency of the coating.

[0261] <30>

[0262] The method for producing a coating according to any one of <23> to <29>, further comprising: a cosmetic application step of applying a cosmetic containing powder to a skin surface, and the electrostatic spraying step is performed after the cosmetic application step.

[0263] <31>

[0264] In the method for producing a coating according to any one of <23> to <30>, the electrostatic spray device further includes a housing that accommodates the cassette and the main body and can be gripped by one hand.

[0265] <32>

[0266] A method for manufacturing a coating, wherein:

[0267] The method for producing the coating comprises: an electrostatic spraying step of directly electrostatically spraying a liquid composition onto the skin surface using an electrostatic spray device to form a coating on the skin;

[0268] The electrostatic spray device comprises a box portion and a main body portion.

[0269] The cartridge has: a container that can contain the liquid composition and can be deformed according to internal pressure; a nozzle that ejects the liquid composition; and a pump that supplies the liquid composition contained in the container to the nozzle.

[0270] The main body has: a power source that ejects the liquid composition by driving the pump; and a power transmission unit that transmits power from the power source to the pump.

[0271] The power transmission part electrically insulates the power source from the box part.

[0272] The liquid composition contains the following components (a) and (b),

[0273] (a) one or more volatile substances selected from alcohols and ketones;

[0274] (b) A polymer having film-forming ability.

[0275] <33>

[0276] The method for producing a coating according to <32>, wherein:

[0277] The liquid composition further contains water as component (c).

[0278] The content mass ratio (b / c) of the component (b) to the component (c) is 0.4 or more and 50 or less.

[0279] <34>

[0280] In the method for producing a coating according to <32> or <33>, the cassette section is detachable from the main body section.

[0281] <35>

[0282] In the method for producing a coating according to any one of <32> to <34>, the housing portion is detachable from the cassette portion.

[0283] <36>

[0284] The method for producing a coating according to any one of <32> to <35>, wherein in the electrostatic spraying step, the liquid composition is electrostatically sprayed onto the skin to form a porous coating composed of deposited fibers.

[0285] <37>

[0286] The method for manufacturing the coating described in any one of <32> to <36> above comprises: the electrostatic spraying step; and a liquid application step of applying a liquid containing one or more selected from water, a polyol and an oil that is liquid at 20°C to the skin.

[0287] <38>

[0288] The method for producing a coating according to <37>, wherein:

[0289] In the electrostatic spraying step, a porous film consisting of fiber deposits is formed.

[0290] Next, in the liquid agent applying step, the liquid agent is applied onto the porous film to form a liquid agent-supported film in which the liquid agent is present between fibers constituting the porous film and / or on the fiber surfaces.

[0291] <39>

[0292] The method for producing a coating according to <37> or <38>, wherein in the liquid agent applying step, the liquid agent is applied to the coating to maintain the transparency of the coating.

[0293] <40>

[0294] The method for producing a coating according to any one of <32> to <39>, further comprising: a cosmetic application step of applying a cosmetic containing powder to a skin surface, and the electrostatic spraying step is performed after the cosmetic application step.

[0295] <41>

[0296] In the method for producing a coating according to any one of <32> to <40>, the electrostatic spray device further includes a housing that accommodates the cassette and the main body and can be held by one hand.

[0297] Example

[0298] Below, the present invention is described in more detail by examples. However, the scope of the present invention is not limited by these examples. In the absence of special instructions, "%" and "part" mean "mass %" and "mass part".

[0299] [Example 1-1]

[0300] (1) Preparation of liquid composition

[0301] As the component (a) of the liquid composition, 99.5% ethanol (manufactured by Wako Pure Chemical Industries, Ltd.) was used, as the component (b), polyvinyl butyral (manufactured by Sekisui Chemical Co., Ltd., S-LEC B BM-1) was used, and as the component (c), ion exchange water was used. The mixing ratio of each component was set as shown in Table 1. These components were stirred at room temperature using a propeller mixer for about 12 hours to obtain a uniform and transparent mixed solution. This was used as a liquid composition.

[0302] (2) Electrostatic spray process

[0303] Use with Figure 1 The structure shown and having Figure 7 The electrostatic spray device 10 of the appearance shown was subjected to electrostatic spraying for 20 seconds on a skin model (artificial leather, PROTEIN LEATHER PBZ13001BK, manufactured by Idemitsu Technofine Co., Ltd.) cut into a size of 50 mm x 50 mm. The conditions of the electrostatic spraying were as follows.

[0304] Applied voltage: 30kV

[0305] Distance between nozzle and skin model: 100mm

[0306] Liquid composition ejection rate (flow rate): 4 mL / h

[0307] Nozzle diameter: 0.3mm

[0308] Environment: 25℃, 40%RH

[0309] [Examples 1-2 and 1-3]

[0310] The electrostatic spraying step was carried out in the same manner as in Example 1-1 except that the conditions shown in the following Table 1 were adopted to obtain a porous film composed of a deposit of fibers.

[0311] [Examples 1-4]

[0312] Components (a) to (c) and distearyl dimethyl ammonium chloride as component (d) were blended under the conditions shown in the following Table 1. The electrostatic spraying step was performed in the same manner as in Example 1-1 except that the applied voltage was set to 10 kV and the spray flow rate was set to 5 mL / h to obtain a porous film composed of a deposit of fibers.

[0313] [Examples 1-5]

[0314] Polyvinyl butyral and an acrylic polymer were used as component (b), and components (a) to (c) were blended under the conditions shown in Table 1. The electrostatic spraying step was performed in the same manner as in Example 1-1, except that the spray flow rate was set to 3 mL / h, to obtain a porous film composed of a deposit of fibers.

[0315] [Comparative Example 1-1]

[0316] The electrostatic spraying step was carried out in the same manner as in Example 1-1 under the conditions shown in Table 1 below, except that the spray flow rate was changed to 0.05 mL / h, to obtain a porous film composed of a deposit of fibers.

[0317] [Comparative Example 1-2]

[0318] The electrostatic spraying step was carried out in the same manner as in Example 1-1 under the conditions shown in Table 1 below, except that the applied voltage was 3 kV, to obtain a porous film composed of a deposit of fibers.

[0319] [Formative evaluation of coating]

[0320] Towards Figure 1The electrostatic spray device 10 was filled with the liquid composition prepared in the ratio shown in Table 1, and electrostatic spray was applied to the skin model for 20 seconds. The film formation was visually judged according to the following criteria. The results are shown in Table 1.

[0321] ○: The film was stably formed for 1 minute or more.

[0322] ×: Spinning could not be performed stably, and a coating was not formed or the coating was uneven.

[0323] [Table 1]

[0324]

[0325]

[0326] (*1) S-LEC B BM-1 (Sekisui Chemical Co., Ltd.)

[0327] (*2)MAS683 acrylic acid-based water-insoluble polymer, CosMED Pharmaceutical Co. Ltd.

[0328] (*3)VARISOFT TA100(Evonik Japan Co.,Ltd.)

[0329] As is clear from the results shown in Table 1, the electrostatic spray device used in the present invention can stably form a coating film. Also, it is clear that the coating film of each example is formed to have a high degree of adhesion to the skin model.

[0330] [Examples 1-6 to 1-9] and [Comparative Example 1-3]

[0331] Components (a), (b) and (c) were mixed in the same proportion as in Example 2 to obtain a liquid composition. Figure 2 The structure shown and having Figure 7 The electrostatic spray device 10 with the appearance shown in the figure was used to electrostatically spray the obtained liquid composition onto a skin model cut into 50 mm×50 mm (artificial leather, PROTEIN LEATHER PBZ13001BK, manufactured by Idemitsu Technofine Co., Ltd.) for 30 seconds. The conditions of the electrostatic spray method were set as shown in Table 2, except that the diameter of the nozzle was set to 0.3 mm and the environment of the electrostatic spray was set to 23.5°C and 30%RH.

[0332] [Examples 1-10 and 1-11]

[0333] The electrostatic spraying step was carried out in the same manner as in Example 1-6, except that a polyurethane resin (Baycusan C2000 manufactured by Covestro Deutschland AG) was used as component (b), and the conditions and spraying conditions shown in Table 2 were adopted to obtain a porous film composed of a deposit of fibers. The conditions for the electrostatic spraying method were as follows.

[0334] Applied voltage: 30kV

[0335] Distance between nozzle and skin model: 100mm

[0336] Liquid composition ejection speed (flow rate): 5 mL / h

[0337] Nozzle diameter: 0.3mm

[0338] Environment: 25℃, 70%RH

[0339] [Formative evaluation of coating]

[0340] exist Figure 2 The electrostatic spray device 10 was filled with the liquid composition prepared in the ratio shown in Table 2, and electrostatic spray was applied to the skin model for 30 seconds. The film formation was visually judged according to the following criteria. The results are shown in Table 2.

[0341] ○: A film was well formed on the skin model.

[0342] XX: Droplets of the liquid composition were ejected, and the coating was uneven.

[0343] [Table 2]

[0344]

[0345]

[0346] (*1) S-LEC B BM-1 (Sekisui Chemical Co., Ltd.)

[0347] (*3)VARISOFT TA100(Evonik Japan Co.,Ltd.)

[0348] (*6)Baycusan C2000 40% (Covestro Deutschland AG)

[0349] As is clear from the results shown in Table 2, regarding the coatings of each example, Figure 1 The electrostatic spray device shown can stably form a coating. The coatings of Examples 1-6 to 1-9 formed coatings with higher adhesion to the skin model than the coating of Comparative Example 1-3.

[0350] [Example 2-1]

[0351] (1) Preparation of liquid composition

[0352] As the component (a) of the liquid composition, 99.5% ethanol (manufactured by Wako Pure Chemical Industries, Ltd.) was used, as the component (b), polyvinyl butyral (manufactured by Sekisui Chemical Co., Ltd., S-LEC B BM-1) was used, and as the component (c), ion exchange water was used. Regarding the mixing ratio of each component, component (a) was set to 79.5%, component (b) was set to 14%, and component (c) was set to 0.5%. These components were stirred at room temperature using a propeller mixer for about 12 hours to obtain a uniform and transparent mixed solution. This was used as a liquid composition.

[0353] (2) Electrostatic spray process

[0354] use Figure 2 and Figure 3 The structure shown and having Figure 7 The electrostatic spray device 10 with the appearance shown was used to perform the electrostatic spray method for 20 seconds on a skin model cut into 50 mm x 50 mm (artificial leather, PROTEIN LEATHER PBZ13001BK, manufactured by Idemitsu Technofine Co., Ltd.). Figure 2 and Figure 3 The screw shaft 171 and the feed screw 172 of the main body 10B of the electrostatic spray device 10 are made of non-conductive plastic. The conditions of the electrostatic spray method are as follows.

[0355] Applied voltage: 10kV

[0356] Distance between nozzle and skin model: 100mm

[0357] Liquid composition spraying speed: 5mL / h

[0358] Nozzle diameter: 0.3mm

[0359] Environment: 25℃, 40%RH

[0360] [Examples 2-2 to 2-6]

[0361] The electrostatic spraying step was carried out in the same manner as in Example 2-1 except that the conditions shown in the following Table 3 were adopted to obtain a porous film composed of a deposit of fibers.

[0362] 〔Insulation evaluation〕

[0363] The evaluation was performed by applying a voltage of 10 kV to the nozzle 15 while the liquid composition of the example or comparative example was loaded at the tip of the nozzle 15, and measuring the leakage current. The results are shown in Table 3. The evaluation criteria were as follows.

[0364] ○: Leakage current is 0.1 mA or less.

[0365] ×: The leakage current exceeds 0.1 mA.

[0366] 〔Evaluation of spinnability〕

[0367] exist Figure 2 The electrostatic spray device 10 was filled with the liquid composition prepared in the ratio shown in Table 3, and electrostatic spraying was performed. The spinnability was visually judged according to the following criteria. The results are shown in Table 3.

[0368] ○: The film was stably formed for 1 minute or more.

[0369] ×: Spinning could not be performed stably and no film was formed.

[0370] [Evaluation of close fit]

[0371] The films formed in the examples and comparative examples were evaluated for their close adhesion to the skin model. The film was touched with a finger in a direction perpendicular to the skin model to apply a fine vibration load, and a shear force was applied to the film with a finger back and forth in a direction parallel to the skin model, and the state of the film was visually observed to evaluate the close adhesion. The results are shown in Table 3. The evaluation criteria were as follows.

[0372] 1: When a slight vibration load is applied in the vertical direction with a finger, the coating is almost completely peeled off.

[0373] 2: When a slight vibration load is applied in the vertical direction with a finger, the fibers forming the coating are partially peeled off.

[0374] 3: Although no peeling occurs in the perpendicular direction, the coating is almost completely peeled off when shearing force is applied in the parallel direction.

[0375] 4: Although no peeling occurs in the vertical direction, the coating or fiber is partially peeled off when shearing force is applied in the parallel direction with fingers.

[0376] 5: No peeling occurs in the perpendicular direction, and even when a shear force is applied in the parallel direction, the coating or fibers do not peel off.

[0377] [Table 3]

[0378]

[0379]

[0380] As shown in Table 3, it is clear that Figure 2 and Figure 3 The electrostatic spray device of the present invention having the above structure has high insulation and can perform spinning stably. It is known that the coating film of the example is formed into a coating film with high adhesion to the skin model.

[0381] [Example 3-1]

[0382] (1) Preparation of liquid composition

[0383] As the component (a) of the liquid composition, 99.5% ethanol (manufactured by Wako Pure Chemical Industries, Ltd.) was used, as the component (b), polyvinyl butyral (manufactured by Sekisui Chemical Co., Ltd., S-LEC B BM-1) was used, and as the component (c), ion exchange water was used. Regarding the mixing ratio of each component, the component (a) was set to 79.5%, the component (b) was set to 14%, and the component (c) was set to 0.5%. These components were stirred at room temperature using a propeller mixer for about 12 hours to obtain a uniform and transparent mixed solution. This was used as a liquid composition.

[0384] (2) Electrostatic spray process

[0385] Use with Figure 5 and Figure 6 The structure shown and having Figure 7 The electrostatic spray device 10 of the appearance shown was subjected to electrostatic spraying for 20 seconds on a skin model cut into 50 mm x 50 mm (artificial leather, PROTEIN LEATHER PBZ13001BK, manufactured by Idemitsu Technofine Co., Ltd.). A non-conductive member made of plastic was used as the power transmission unit 17. The conditions of the electrostatic spraying were set as follows.

[0386] Applied voltage: 10kV

[0387] Distance between nozzle and skin model: 100mm

[0388] Liquid composition spraying speed: 5mL / h

[0389] Nozzle diameter: 0.3mm

[0390] Environment: 25℃, 40%RH

[0391] [Examples 3-2 to 3-6]

[0392] The electrostatic spraying step was carried out in the same manner as in Example 3-1 except that the conditions shown in the following Table 4 were adopted to obtain a porous film composed of a deposit of fibers.

[0393] 〔Insulation evaluation〕

[0394] The evaluation was performed by applying a voltage of 10 kV to the nozzle 15 while the liquid composition of the example or comparative example was loaded at the tip of the nozzle 15, and measuring the leakage current. The results are shown in Table 4. The evaluation criteria were as follows.

[0395] ○: Leakage current is 0.1 mA or less.

[0396] ×: The leakage current exceeds 0.1 mA.

[0397] 〔Evaluation of spinnability〕

[0398] exist Figure 5 and Figure 6 The electrostatic spray device 10 shown was filled with the liquid composition prepared at the ratio shown in Table 4, and electrostatic spraying was performed. The spinnability was visually judged based on the following criteria. The results are shown in Table 4.

[0399] ○: The film was stably formed for 1 minute or more.

[0400] ×: Spinning could not be performed stably and no film was formed.

[0401] [Evaluation of close fit]

[0402] The films formed in the examples and comparative examples were evaluated for their close adhesion to the skin model. The film was touched with a finger in a direction perpendicular to the skin model to apply a fine vibration load, and a shear force was applied to the film with a finger back and forth in a direction parallel to the skin model, and the state of the film was visually observed to evaluate the close adhesion. The results are shown in Table 4. The evaluation criteria were as follows.

[0403] 1: When a slight vibration load is applied in the vertical direction with a finger, the coating is almost completely peeled off.

[0404] 2: When a slight vibration load is applied in the vertical direction with a finger, the fibers forming the coating are partially peeled off.

[0405] 3: Although no peeling occurs in the perpendicular direction, the coating is almost completely peeled off when shearing force is applied in the parallel direction.

[0406] 4: Although no peeling occurs in the vertical direction, the coating or fiber is partially peeled off when shearing force is applied in the parallel direction with fingers.

[0407] 5: No peeling occurs in the perpendicular direction, and even when a shear force is applied in the parallel direction, the coating or fibers do not peel off.

[0408] [Table 4]

[0409]

[0410]

[0411] As shown in Table 4, it is clear that Figure 5 and Figure 6 The electrostatic spray device of the present invention having the above structure has high insulation and can perform spinning stably. It is known that the coating film of the example is formed into a coating film with high adhesion to the skin model.

[0412] [Examples 4-1 to 4-9]

[0413] The liquid compositions of Examples 4-1 to 4-9 were prepared by the same method as in Example 2-1 except that the components (a), (b), (c), (d) and other components were blended in the ratios shown in Table 5. The blending ratios are shown in the following Table 5. The electrostatic spraying method was performed in the same manner as in Example 2-1 except that it was performed under the following conditions.

[0414] The conditions of the electrostatic spray method were as follows.

[0415] Applied voltage: 10kV

[0416] Distance between nozzle and skin model: 80mm

[0417] Liquid composition spraying speed: 5mL / h

[0418] Environment: 30℃, 70%RH

[0419] 〔Viscosity evaluation〕

[0420] The liquid compositions of Examples 4-1 to 4-9 prepared with the compositions shown in Table 5 were stored at 25°C for 24 hours, and then the viscosity at 25°C was measured using an E-type viscometer. As the E-type viscometer, an E-type viscometer (VISCONIC EMD) manufactured by Tokyo Keiki Co., Ltd. was used, and the measurement was performed with a rotor No. 43 and a rotation speed of 20 rpm. In the case where the viscosity was 150 mPa·s or more, the measurement was performed at a rotation speed of 10 rpm. The measurement results are shown in Table 5.

[0421] 〔Evaluation of electrical conductivity〕

[0422] The liquid compositions of Examples 4-1 to 4-9 prepared with the compositions shown in Table 5 were stored at 25°C for 24 hours, and then the conductivity was measured using an impedance measuring device (SI1260, manufactured by Solartron) under the conditions of a measuring terminal (SH-Z), 25°C, φ10 mm, and a distance of 1 mm. The measurement results are shown in Table 5.

[0423] [Sprayability Evaluation]

[0424] The sprayability of the liquid composition was evaluated using an electrostatic spray device.

[0425] A: Spinning is stable and film formation is good.

[0426] B: The fibers are slightly fluffy during spinning. A coating can be formed.

[0427] C: The fibers are fluffy during spinning and can barely form a film.

[0428] D: The fibers are fluffy to the extent that they fly around during spinning. It is difficult to form a film.

[0429] [Table 5]

[0430]

[0431]

[0432] (*1) S-LEC B BM-1 (Sekisui Chemical Co., Ltd.)

[0433] (*2)VARISOFT TA100(Evonik Japan Co.,Ltd.)

[0434] (*3) NIKKOL CA101 (50% aqueous solution / effective amount in the table) (Nikko Chemicals Co., Ltd.)

[0435] (*4)NIKKOL Sarcosinate PN(Nikko Chemicals Co.,Ltd.)

[0436] (*5)ELDEW PS-203(Ajinomoto Co.,Inc.)

[0437] As shown in Table 5, the liquid compositions of Examples 4-1 to 4-9 were able to form a film even in an environment with a humidity of 70% RH, compared with the liquid compositions of Reference Examples 10 to 12. In particular, it was confirmed that the liquid compositions of Examples 4-2 to 4-9 were able to be sprayed well and form a film.

[0438] Industrial Applicability

[0439] According to the present invention, the insulation performance of the electrostatic spray device can be ensured when it is used, and a film with stable quality can be produced on the skin without depending on changes in the surrounding environment such as humidity.

Claims

1. An electrostatic spray device, wherein: The electrostatic spray device is used to electrostatically spray the liquid composition directly onto the skin surface to form a film on the skin. The electrostatic spray device comprises a cartridge having a container capable of containing the liquid composition, a main body, a nozzle for spraying the liquid composition from the container, and a power source for applying a voltage to the nozzle. The electrostatic spray device further comprises: a housing that accommodates the cartridge and the main body and can be held by one hand; The nozzle is arranged at one end of the housing. The main body has: a power source for ejecting the liquid composition; and a power transmission unit for transmitting power from the power source to the box. The power transmission part electrically insulates the power source from the box part. The cassette portion is attachable and detachable from the main body portion. The liquid composition contains the following components (a), (b) and (c), (a) one or more volatile substances selected from alcohols and ketones, (b) a water-insoluble polymer having film-forming ability, (c) water in an amount of 0.2% by mass or more and 25% by mass or less in the liquid composition, The electrostatic spray device is configured to apply a voltage of 5 kV to 50 kV to the nozzle and to spray the liquid composition at a flow rate of 0.4 mL / h to 30 mL / h. The ratio of the flow rate F to the voltage P is less than 0.8, wherein the unit of the flow rate F is mL / h, the unit of the voltage P is kV, and the ratio of the flow rate F to the voltage P is flow rate F / voltage P.

2. The electrostatic spray device according to claim 1, wherein: The cartridge unit includes a pump unit that supplies the liquid composition contained in the container to the nozzle.

3. The electrostatic spray device according to claim 1 or 2, wherein: The accommodation portion is deformable according to internal pressure.

4. The electrostatic spray device according to claim 1 or 2, wherein: The magazine portion includes a gasket that is slidable along an inner surface of the container portion that contains the liquid composition.

5. The electrostatic spray device according to claim 1 or 2, wherein: The volume of the containing part is not less than 1 mL and not more than 20 mL.

6. The electrostatic spray device according to claim 1 or 2, wherein: The liquid composition is contained in the containing portion.

7. The electrostatic spray device according to claim 1, wherein: The power supply is a high voltage power supply, The electrostatic spray device further includes: a low voltage power supply; and a circuit that connects the high voltage power supply to the low voltage power supply and boosts a voltage generated by the low voltage power supply to a high voltage.

8. The electrostatic spray device according to claim 7, wherein: The electrostatic spray device further includes an auxiliary circuit that exists between the low voltage power supply and the high voltage power supply and adjusts the voltage of the low voltage power supply.

9. The electrostatic spray device according to claim 1 or 2, wherein: The voltage applied to the nozzle is 10 kV or more and 30 kV or less.

10. The electrostatic spray device according to claim 1 or 2, wherein: The flow rate of the liquid composition ejected from the nozzle is 2 mL / h or more and 11.5 mL / h or less.

11. The electrostatic spray device according to claim 1, wherein: The ratio of the flow rate F to the voltage P is greater than 0.1 and less than 0.6, wherein the unit of the flow rate F is mL / h, the unit of the voltage P is kV, and the ratio of the flow rate F to the voltage P is flow rate F / voltage P.

12. The electrostatic spray device according to claim 1 or 2, wherein: The flow path length of the nozzle is not less than 1 mm and not more than 25 mm.

13. The electrostatic spray device according to claim 1 or 2, wherein: The nozzle has a micro space through which the liquid composition flows, and the diameter of the cross section of the micro space is 100 μm or more and 2000 μm or less.

14. The electrostatic spray device according to claim 13, wherein: The nozzle has a micro space through which the liquid composition flows, and a diameter of a cross section of the micro space is 250 μm or more and 1400 μm or less.

15. The electrostatic spray device according to claim 1 or 2, wherein: The electrical conductivity of the liquid composition at 25° C. is 8 μS / cm or more and 300 μS / cm or less.

16. The electrostatic spray device according to claim 1, wherein: The content of the component (c) in the liquid composition is 0.4 mass % to 18 mass %.

17. The electrostatic spray device according to claim 1 or 16, wherein: The content mass ratio b / c of ​​the component (b) to the component (c) is 0.4 or more and 140 or less.

18. The electrostatic spray device according to claim 17, wherein: The content mass ratio b / c of ​​the component (b) to the component (c) is 0.6 to 40.

19. The electrostatic spray device according to claim 1 or 2, wherein: The component (b) is a substance that can be dissolved in the volatile substance of the component (a).

20. The electrostatic spray device according to claim 1 or 2, wherein: The content of the component (b) in the liquid composition is 1 mass % to 40 mass %.

21. The electrostatic spray device according to claim 20, wherein: The content of the component (b) in the liquid composition is 5 mass % or more and 25 mass % or less.

22. The electrostatic spray device according to claim 1 or 2, wherein: The component (b) is at least one selected from partially saponified polyvinyl alcohol, completely saponified polyvinyl alcohol, polyvinyl butyral resin, polymethacrylic resin, polyvinyl acetal diethylamino acetate, oxazoline-modified silicone, and polylactic acid.

23. The electrostatic spray device according to claim 22, wherein: The component (b) contains a polyvinyl butyral resin.

24. The electrostatic spray device according to claim 1 or 2, wherein: The content of the component (a) in the liquid composition is 50% by mass or more and 95% by mass or less.

25. The electrostatic spray device according to claim 24, wherein: The content of the component (a) in the liquid composition is 65% by mass or more and 92% by mass or less.

26. The electrostatic spray device according to claim 1 or 2, wherein: The viscosity of the liquid composition at 25° C. is 5 mPa·s or more and 3000 mPa·s or less.

27. The electrostatic spray device according to claim 1 or 2, wherein: The coating is composed of a deposit of fibers.

28. A method for manufacturing a coating, wherein: The method for producing the coating film comprises an electrostatic spraying step of electrostatically spraying the liquid composition directly onto the skin surface using the electrostatic spray device according to any one of claims 1 to 27 to form a coating film on the skin.

29. The method for producing a coating according to claim 28, wherein: In the electrostatic spraying step, the distance between the nozzle and the skin is set to be 10 mm to 160 mm.

30. The method for producing a coating according to claim 28 or 29, wherein: In the electrostatic spraying step, the basis weight of the coating is relative to 1m 2 Skin: 0.05g / m 2 Above 50g / m 2 the following.

31. The method for producing a coating according to claim 28 or 29, wherein: The method further comprises a liquid agent application step of applying a liquid agent different from the liquid composition to the skin, the liquid agent containing one or more selected from water, a polyol, and an oil that is liquid at 20°C.

32. The method for manufacturing a coating according to claim 31, wherein: In the electrostatic spraying step, a porous film consisting of fiber deposits is formed. Next, in the liquid agent applying step, the liquid agent is applied onto the porous film to form a liquid agent-supported film in which the liquid agent is present between fibers constituting the porous film and / or on the fiber surfaces.

33. The method for producing a coating according to claim 31, wherein: In the liquid agent application step, the liquid agent is applied onto the coating film to maintain the transparency of the coating film.

34. The method for producing a coating according to claim 28 or 29, wherein: The method further comprises: a cosmetics applying step of applying cosmetics containing powder to the skin surface, and the electrostatic spraying step is performed after the cosmetics applying step.

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