Coating manufacturing method

Abstract

To provide methods for producing a coating film which is formed on the skin by an electrostatic spray and does not cause damage even after a long period of time, and additionally which has a good feeling of finish.SOLUTION: A method for producing a coating film on the skin comprises the following steps A) and B) in this order or in reverse order: A) forming a coating film on the skin surface by electrostatically spraying composition X containing component (a) and component (b): (a) one or more volatile substances selected from water, alcohols and ketones; and (b) a polymer with film-forming ability; and B) applying to the skin composition Y other than the composition X, containing component (c) and component (d) in such an amount that the mass ratio ((d) / (c)) of component (d) to component (c) is 0.25 or more and 2.5 or less: (c) 1 mass% or more and 20 mass% or less of a water-insoluble polymer having a glass transition point of -20°C or more and 25°C or less; and (d) a polyol having two hydroxyl groups.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a method for producing a coating on the skin. [Background technology]

[0002] Methods for forming a coating on skin by electrostatic spraying have been reported. For example, Patent Document 1 describes a method for treating skin, which includes electrostatically spraying a composition onto the skin. The composition used in this method contains a liquid insulating material, a conductive material, a particulate powder material, and a thickener. This composition typically includes a pigment-containing cosmetic or skin care composition. Specifically, a cosmetic foundation is used as the composition. That is, the invention described in Patent Document 1 is primarily intended for applying makeup to the skin by electrostatically spraying a cosmetic foundation for cosmetic purposes. Furthermore, Patent Document 2 describes a disposable cartridge for use in an electrostatic cosmetic spray device.

[0003] However, it has been found that when a coating is formed on the skin by electrostatic spraying according to the methods described in Patent Documents 1 and 2, the adhesion between the skin and the coating formed by electrostatic spraying is insufficient, and the coating may be damaged or peeled off due to external forces such as friction. The present applicant has therefore discovered that applying a liquid containing water, polyol, or oil that is liquid at 20°C before or after forming a coating by electrostatic spraying improves the adhesion of the coating obtained by electrostatic spraying, and has filed a patent application for this finding (Patent Document 3). Furthermore, to prevent damage to the formed coating even after a long period of time, a patent application has been filed for a method of applying a composition containing a small amount of adhesive polymer and a polyol such as glycerin or a liquid oil to the skin before or after forming a coating by electrostatic spraying (Patent Document 4). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-104211 [Patent Document 2] Special Publication No. 2003-507165 [Patent Document 3] Japanese Patent Application Laid-Open No. 2017-78062 [Patent Document 4] Patent Publication No. 2020-26398 Summary of the Invention [Problem to be solved by the invention]

[0005] However, although the coating on the skin obtained by the method described in Patent Document 4 does not cause damage even after a long period of time has passed, the effect is still not sufficient, and the finish feel of the coating on the skin obtained is not satisfactory, so for example, it has been necessary to devise a method for applying foundation in order to achieve good makeup application. Therefore, an object of the present invention is to provide a method for producing a coating formed on the skin by electrostatic spraying that does not cause damage even after a long period of time has passed and that also has a good finish. [Means for solving the problem]

[0006] The present inventors therefore further investigated the composition of the composition to be applied before or after the formation of a film on the skin by electrostatic spraying. They found that if a composition different from the composition used for electrostatic spraying is used, which contains a water-insoluble polymer with a glass transition point within a specific range and a polyol having two hydroxyl groups in a certain ratio, not only can a film be formed that is resistant to peeling or tearing even after a long period of time has passed, but also a smooth and glossy finish that lasts for a long period of time, allowing for good subsequent makeup application by simply applying, for example, foundation, and thus completed the present invention.

[0007] That is, the present invention provides the following inventions [1] to [3]. [1] A) forming a coating on the skin surface by electrostatically spraying a composition X containing component (a) and component (b); (a) one or more volatile substances selected from water, alcohols, and ketones; (b) Polymers with film-forming properties B) applying to the skin a composition Y other than composition X, which contains components (c) and (d) in amounts such that the mass ratio of components (d) to (c) ((d) / (c)) is 0.25 or more and 2.5 or less, in this order or in the reverse order. (c) 1% by mass or more and 20% by mass or less of a water-insoluble polymer having a glass transition temperature of -20°C or more and 25°C or less; (d) Polyol having two hydroxyl groups

[0008] [2] Composition Y is used to produce a coating on the skin by applying it to the skin before or after forming a coating on the skin surface by electrostatic spraying, and contains component (c) and component (d) in amounts such that the mass ratio of component (d) to component (c) ((d) / (c)) is 0.25 or more and 2.5 or less. (c) 1% by mass or more and 20% by mass or less of a water-insoluble polymer having a glass transition temperature of -20°C or more and 25°C or less; (d) Polyol having two hydroxyl groups

[0009] [3] A kit for producing a coating on the skin containing composition X and composition Y, Composition X is a composition containing component (a) and component (b) and is used to form a film on the skin surface by electrostatic spraying, (a) one or more volatile substances selected from water, alcohols, and ketones; (b) Polymers with film-forming properties The kit comprises composition Y, which contains components (c) and (d) in amounts such that the mass ratio of components (d) to (c) ((d) / (c)) is 0.25 or more and 2.5 or less, and which is to be applied to the skin before or after the formation of a coating by electrostatic spraying of composition X. (c) 1% by mass or more and 20% by mass or less of a water-insoluble polymer having a glass transition temperature of -20°C or more and 25°C or less; (d) Polyol having two hydroxyl groups [Effects of the Invention]

[0010] The coating formed on the skin by the method of the present invention not only has improved adhesion even after a long period of time and is resistant to peeling and tearing, but also maintains a smooth, glossy finish for a long period of time, resulting in excellent makeup durability even when a foundation is applied. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of an electrostatic spray device that is preferably used in the present invention. [Figure 2] FIG. 2 is a schematic diagram showing how the electrostatic spraying method is carried out using an electrostatic spraying device. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention includes the steps of A) electrostatically spraying composition X to form a film on the skin surface (step A) and B) applying composition Y to the skin (step B). In the present invention, electrostatic spraying is used as the method for forming the coating in step A. Electrostatic spraying is a method in which a positive or negative high voltage is applied to a composition to charge the composition, and the charged composition is then sprayed toward an object. The sprayed composition spreads into space while repeatedly being atomized by Coulomb repulsion, and during this process, or after it has adhered to the object, the volatile solvent dries, forming a coating on the surface of the object. The coating formed is preferably a porous coating, more preferably a porous coating consisting of a fiber deposit. Here, the coating consisting of a fiber deposit means a coating consisting of a fiber deposit of component (a), and may include a liquid substance present in parts other than the fibers, for example, around the fibers. Furthermore, from the viewpoint of forming such a porous coating, the electrostatic spraying is preferably electrospinning. The process of forming a film on the skin surface by electrostatic spraying includes (1) a process of electrostatically spraying directly onto the skin to form a film (hereinafter also referred to as the direct method); and (2) a process in which the user or assistant electrostatically sprays the composition onto an object other than the skin to produce a fibrous sheet, which is then applied to the skin (hereinafter also referred to as the indirect method). The electrostatic spray device used in this case is a handy electrostatic spray device that can be held in the hand and is also called an electrospinning spray device. Examples of objects other than skin include metal substrates, resin substrates, foaming agent substrates, rubber substrates, cloth substrates, nonwoven fabric substrates, and wood substrates, and among these, foaming agent substrates are preferred, and specific examples include cosmetic puffs.

[0013] The composition X used in the present invention (hereinafter, this composition X may also be referred to as the "spray composition") is liquid in the environment in which the electrostatic spray method is performed. This composition X contains the following components (a) and (b): (a) One or more volatile substances selected from water, alcohols, and ketones. (b) A polymer having film-forming properties. The "spray composition" is fine like mist when ejected, but is stretched by electrical Coulomb repulsion, so it can also be called a "electrostatic ejection composition." Each component will be described below.

[0014] The volatile substance of component (a) is a substance that is volatile in a liquid state. In the spray composition, component (a) is sprayed from the nozzle tip toward the skin after the spray composition is placed in an electric field and sufficiently charged. As component (a) evaporates, the charge density of the spray composition becomes excessive, and component (a) further evaporates while being further atomized by Coulomb repulsion, ultimately forming a dry film on the skin. For this purpose, the vapor pressure of the volatile substance at 20°C is preferably 0.01 kPa or more and 106.66 kPa or less, more preferably 0.13 kPa or more and 66.66 kPa or less, even more preferably 0.67 kPa or more and 40.00 kPa or less, and even more preferably 1.33 kPa or more and 40.00 kPa or less.

[0015] Among the volatile substances of component (a), suitable alcohols include, for example, monohydric chain aliphatic alcohols, monohydric cyclic aliphatic alcohols, and monohydric aromatic alcohols. Examples of monohydric chain aliphatic alcohols include C1-C6 alcohols, examples of monohydric cyclic aliphatic alcohols include C4-C6 cyclic alcohols, and examples of monohydric aromatic alcohols include benzyl alcohol and phenylethyl alcohol. Specific examples of these alcohols include ethanol, isopropyl alcohol, butyl alcohol, phenylethyl alcohol, n-propanol, and n-pentanol. One or more of these alcohols can be used.

[0016] Among the volatile substances of component (a), ketones include di-C1-C4 alkyl ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, etc. These ketones can be used alone or in combination of two or more.

[0017] The volatile substance of component (a) more preferably contains one or more selected from ethanol, isopropyl alcohol, and butyl alcohol, more preferably contains one or more selected from ethanol and butyl alcohol, and even more preferably contains at least ethanol. Component (a) may contain water in addition to one or more selected from alcohols and ketones.

[0018] The content of component (a) in the spray composition is preferably 30% by mass or more, more preferably 55% by mass or more, and even more preferably 60% by mass or more. It is also preferably 97% by mass or less, more preferably 94% by mass or less, and even more preferably 92% by mass or less. The content of component (a) in the spray composition is preferably 30% by mass or more and 97% by mass or less, more preferably 55% by mass or more and 94% by mass or less, and even more preferably 60% by mass or more and 92% by mass or less. By including component (a) in the spray composition in this proportion, the spray composition can be sufficiently volatilized when electrostatic spraying is performed. Furthermore, the amount of ethanol is preferably 50% by mass or more, more preferably 65% ​​by mass or more, and even more preferably 80% by mass or more, based on the total amount of volatile substances in component (a). It is also preferably 100% by mass or less. The amount of ethanol is preferably 50% by mass or more and 100% by mass or less, more preferably 65% ​​by mass or more and 100% by mass or less, and even more preferably 80% by mass or more and 100% by mass or less, based on the total amount of volatile substances in component (a). Furthermore, from the viewpoint of fiber-forming ability and conductivity, the amount of water is preferably less than 50% by mass, more preferably 30% by mass or less, even more preferably 10% by mass or less, and even more preferably 5% by mass or less, and is preferably 0.01% by mass or more, more preferably 0.2% by mass or more, and even more preferably 0.4% by mass or more, based on the total amount of volatile substances (a).

[0019] The film-forming polymer of component (b) is generally a substance that can be dissolved or dispersed in the volatile substance of component (a). Here, "dissolved" means that the polymer is in a dispersed state at 20°C, and that the dispersed state is visually uniform, preferably visually transparent or translucent.

[0020] The film-forming polymer is selected from those suitable for the properties of the volatile substance of component (a). Specifically, film-forming polymers are broadly classified into water-soluble polymers and water-insoluble polymers. As used herein, a "water-soluble polymer" refers to a polymer that, when weighed at 1 atmosphere and 23°C, 1 g of the polymer is immersed in 10 g of ion-exchanged water for 24 hours, dissolves at least 0.5 g of the immersed polymer in water. On the other hand, as used herein, a "water-insoluble polymer" refers to a polymer that, when weighed at 1 atmosphere and 23°C, 1 g of the polymer is immersed in 10 g of ion-exchanged water for 24 hours, does not dissolve at least 0.5 g of the immersed polymer.

[0021] Examples of water-soluble film-forming polymers include mucopolysaccharides such as pullulan, hyaluronic acid, chondroitin sulfate, poly-γ-glutamic acid, modified corn starch, β-glucan, glucooligosaccharides, heparin, and keratosulfate; natural polymers such as cellulose, pectin, xylan, lignin, glucomannan, galacturonic acid, psyllium seed gum, tamarind seed gum, gum arabic, tragacanth gum, soybean water-soluble polysaccharides, alginic acid, carrageenan, laminaran, agar (agarose), fucoidan, methylcellulose, hydroxypropyl cellulose, and hydroxypropylmethylcellulose; and synthetic polymers such as partially saponified polyvinyl alcohol (when not used in combination with a crosslinker), low-saponified polyvinyl alcohol, polyvinylpyrrolidone (PVP), polyethylene oxide, and sodium polyacrylate. These water-soluble polymers can be used alone or in combination of two or more. Among these water-soluble polymers, from the viewpoint of ease of production of the coating, it is preferable to use pullulan, as well as synthetic polymers such as partially saponified polyvinyl alcohol, less saponified polyvinyl alcohol, polyvinylpyrrolidone, and polyethylene oxide. When polyethylene oxide is used as the water-soluble polymer, its number average molecular weight is preferably 50,000 or more and 3,000,000 or less, and more preferably 100,000 or more and 2,500,000 or less.

[0022] On the other hand, examples of water-insoluble polymers capable of forming a film include fully saponified polyvinyl alcohol, which can be insolubilized after film formation, partially saponified polyvinyl alcohol, which can be crosslinked after film formation by using a crosslinking agent in combination, oxazoline-modified silicones such as poly(N-propanoylethyleneimine) graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymer, polyvinyl acetal diethylaminoacetate, zein (a major component of corn protein), polyesters such as polylactic acid (PLA), acrylic resins such as polyacrylonitrile resin and polymethacrylic acid resin, polystyrene resin, polyvinyl butyral resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyurethane resin, polyamide resin, polyimide resin, polyamideimide resin, etc. These water-insoluble polymers can be used alone or in combination of two or more. Of these water-insoluble polymers, it is preferable to use one or more selected from fully saponified polyvinyl alcohol, which can be insolubilized after film formation, partially saponified polyvinyl alcohol, which can be crosslinked after film formation when used in combination with a crosslinking agent, polyvinyl butyral resin, polyurethane resin, oxazoline-modified silicone such as poly(N-propanoylethyleneimine) graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymer, polyvinyl acetal diethylaminoacetate, and zein, and it is more preferable to use one or more selected from polyvinyl butyral resin and polyurethane resin.

[0023] The content of component (b) in the spray composition is preferably 2% by mass or more, more preferably 4% by mass or more, and even more preferably 6% by mass or more. It is also preferably 50% by mass or less, more preferably 43% by mass or less, and even more preferably 36% by mass or less. The content of component (b) in the spray composition is preferably 2% by mass or more and 50% by mass or less, more preferably 4% by mass or more and 43% by mass or less, and even more preferably 6% by mass or more and 36% by mass or less. By incorporating component (b) into the spray composition in this proportion, it is possible to successfully form a film consisting of fiber deposits that masks the surface of bare skin, is resistant to creasing over time, and has excellent cosmetic long-lasting properties.

[0024] The ratio of the contents of component (a) and component (b) in the spray composition ((a) / (b)) is preferably 0.5 or more and 40 or less, more preferably 1 or more and 30 or less, and even more preferably 2 or more and 25 or less, from the viewpoint of being able to sufficiently volatilize component (a) when performing the electrostatic spray method. Furthermore, the ratio ((a) / (b)) of the content of ethanol to the content of component (b) in the spray composition is preferably 0.5 or more and 40 or less, more preferably 1 or more and 30 or less, and even more preferably 2 or more and 25 or less, from the viewpoint of being able to sufficiently volatilize component (a) when performing the electrostatic spray method.

[0025] Furthermore, the spray composition may contain a polyol, preferably a polyol that is liquid at 20°C. Examples of polyols 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 glycols with a molecular weight of 1,000 or less, and polypropylene glycol; and glycerins such as glycerin, diglycerin, and triglycerin. Of these, from the viewpoints of favorable fiber formation and efficient formation of a coating consisting of fiber deposits on the surface of the coating-forming object, ethylene glycol, propylene glycol, 1,3-butanediol, dipropylene glycol, polyethylene glycols with a molecular weight of 1,000 or less, glycerin, and diglycerin are preferred, with propylene glycol, 1,3-butanediol, and glycerin being more preferred, and it is even more preferred that the polyol contains at least polyethylene glycol with a molecular weight of 1,000 or less. The content of the polyol that is liquid at 20°C in the spray composition is preferably 0.1% by mass to 10% by mass, more preferably 0.2% by mass to 9% by mass, more preferably 0.5% by mass to 8% by mass, and even more preferably 1% by mass to 6% by mass.

[0026] Furthermore, the composition may contain an oil component that is liquid at 20° C. There are no particular limitations on the oil component as long as it is liquid at 20° C., and examples thereof include ester oils that are liquid at 20° C., higher alcohols that are liquid at 20° C., hydrocarbon oils that are liquid at 20° C., and silicone oils that are liquid at 20° C. Of these, from the viewpoint of achieving good fiber formation and efficiently forming a coating consisting of fiber deposits on the surface of the object to be coated, ester oils that are liquid at 20°C, hydrocarbon oils that are liquid at 20°C, higher alcohols that are liquid at 20°C, and silicone oils that are liquid at 20°C are preferred, and those containing at least ester oils that are liquid at 20°C are more preferred. The liquid ester oil may be an ester of a straight-chain or branched-chain fatty acid and a straight-chain or branched-chain alcohol or polyhydric alcohol.Specifically, these include isopropyl myristate, cetyl isooctanoate, isocetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, decyl oleate, octyldodecyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, ethylhexyl isononanoate, isononyl isononanoate, isotridecyl isononanoate, isostearyl isostearate, and 12-hydroxystearyl Cholesteryl diol, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, propylene glycol dicaprylate, propylene glycol diisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate , Trimethylolpropane Triisostearate, Cetyl 2-Ethylhexanoate, 2-Ethylhexyl Palmitate, Diethylhexyl Naphthalenedicarboxylate, Benzoate (C12-15) Alkyl, Cetearyl Isononanoate, Tri(Caprylic / Capric) Glycerin, Butylene Glycol (Dicaprylic / Capric), Propylene Glycol (Dicaprylic / Capric), Glyceryl Triisostearate, Glyceryl Tri-2-Heptylundecanoate, Glyceryl Cocoate, Castor Oil Fatty Acid Methyl Ester, O Examples of suitable alkyl acrylates include oleyl leate, 2-heptylundecyl palmitate, diisobutyl adipate, 2-octyldodecyl N-lauroyl-L-glutamate, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, di-2-ethylhexyl succinate, triethyl citrate, 2-ethylhexyl paramethoxycinnamate, and tripropylene glycol dipivalate. Among these, from the viewpoint of forming fibers well and efficiently forming a coating consisting of a deposit of fibers on the surface of the object to be coated, those containing one or more selected from dipentaerythritol fatty acid esters and neopentyl glycol dicaprate are preferred. Furthermore, as the liquid ester oil, vegetable oils and animal oils containing the above-mentioned ester oils can be used, and examples thereof include olive oil, jojoba oil, macadamia nut oil, medfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, apricot kernel oil, rice germ oil, and rice bran oil. The liquid higher alcohol includes liquid higher alcohols having 12 to 20 carbon atoms, and is preferably a higher alcohol containing a branched fatty acid as a constituent, specifically isostearyl alcohol, oleyl alcohol, etc. Examples of the liquid hydrocarbon oil include liquid paraffin, squalane, squalene, n-octane, n-heptane, cyclohexane, light isoparaffin, liquid isoparaffin, hydrogenated polyisobutene, polybutene, and polyisobutene. From the viewpoint of usability, examples of the liquid hydrocarbon oil include liquid paraffin, light isoparaffin, liquid isoparaffin, squalane, squalene, n-octane, n-heptane, and cyclohexane. The liquid silicone oil may contain silicone oil or modified silicone oil. Examples include volatile silicone oil and non-volatile silicone oil, and it is preferable to contain volatile silicone oil. In this context, the volatile silicone oil means one having a flash point of 35 to 87°C. Examples of volatile silicone oils include linear dimethylpolysiloxanes such as hexamethyldisiloxane and octamethyltrisiloxane; branched siloxanes such as methyltrimethicone, tris(trimethylsilyl)methylsilane and tetrakis(trimethylsilyl)silane; and cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane. The content of the oil component that is liquid at 20°C in the spray composition is preferably 0.1% by mass to 25% by mass, more preferably 0.2% by mass to 20% by mass, more preferably 0.5% by mass to 18% by mass, and even more preferably 1% by mass to 16% by mass.

[0027] The spray composition may contain only the above-mentioned components (a) and (b), or may contain other components in addition to components (a) and (b), such as solid oil components, surfactants, coloring pigments, extender pigments, dyes, UV absorbers, fragrances, repellents, antioxidants, stabilizers, preservatives, and various vitamins. It should be noted that these agents are not limited to their intended use and can be used for other purposes depending on the intended purpose. When other components are contained in the spray composition, the content 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.

[0028] In the method of the present invention, a coating is formed on the skin surface by electrostatically spraying the spray composition using the direct or indirect method before or after step B described below.

[0029] When electrostatic spraying is performed, the viscosity of the spray composition at 25°C is preferably 1 mPa·s or more, more preferably 10 mPa·s or more, and even more preferably 50 mPa·s or more. The viscosity at 25°C is preferably 5000 mPa·s or less, more preferably 2000 mPa·s or less, and even more preferably 1500 mPa·s or less. The viscosity of the spray composition at 25°C is preferably 1 mPa·s or more and 5000 mPa·s or less, more preferably 10 mPa·s or more and 2000 mPa·s or less, and even more preferably 50 mPa·s or more and 1500 mPa·s or less. By using a spray composition having a viscosity within this range, a coating, particularly a porous coating consisting of a fiber deposit, can be successfully formed by electrostatic spraying. The formation of a porous coating is advantageous from the viewpoints of preventing the skin from becoming stuffy, improving the adhesion of the coating to the skin, and enabling the coating to be easily and cleanly peeled off from the skin. The viscosity of the spray composition is measured at 25°C using an E-type viscometer. For example, an E-type viscometer manufactured by Tokyo Keiki Co., Ltd. can be used as the E-type viscometer. In this case, rotor No. 43 can be used as the rotor.

[0030] The spray composition is used to form a coating on the surface of human skin by electrostatic spraying using the direct or indirect method. A preferred embodiment for the direct method will be described below. The electrostatic spray method includes an electrostatic spraying step in which a spray composition is electrostatically sprayed onto the skin using an electrostatic spray device to form a coating. The electrostatic spray device includes a container for containing the spray composition, a nozzle for discharging the spray composition, a supply device for supplying the spray composition contained in the container to the nozzle, and a power source for applying voltage to the nozzle. FIG. 1 shows a schematic diagram illustrating the configuration of an electrostatic spray device suitable for use in the present invention. The electrostatic spray device 10 shown in FIG. 1 includes a low-voltage power supply 11. The low-voltage power supply 11 is capable of generating a voltage of several volts to several tens of volts. To enhance the portability of the electrostatic spray device 10, the low-voltage power supply 11 preferably consists of one or more batteries. Using a battery as the low-voltage power supply 11 also has the advantage of allowing for easy replacement as needed. An AC adapter or the like can also be used as the low-voltage power supply 11 instead of a battery.

[0031] The electrostatic spray device 10 also includes a high-voltage power supply 12. The high-voltage power supply 12 is connected to the low-voltage power supply 11 and includes an electronic circuit (not shown) that boosts the voltage generated by the low-voltage power supply 11 to a high voltage. The boost electronic circuit generally includes a transformer, a capacitor, semiconductor elements, etc.

[0032] The electrostatic spray device 10 further includes an auxiliary electric circuit 13. The auxiliary electric circuit 13 is located between the low-voltage power supply 11 and the high-voltage power supply 12, and functions to adjust the voltage of the low-voltage power supply 11 to ensure stable operation of the high-voltage power supply 12. The auxiliary electric circuit 13 also functions to control the rotation speed of a motor included in a pump mechanism 14, which will be described later. By controlling the rotation speed of the motor, the amount of spray composition supplied from a spray composition container 15, which will be described later, to the pump mechanism 14 is controlled. A switch SW is installed between the auxiliary electric circuit 13 and the low-voltage power supply 11, and the electrostatic spray device 10 can be operated / stopped by turning the switch SW on and off.

[0033] The electrostatic spray device 10 further includes a nozzle 16. The nozzle 16 is made of various conductive materials such as metal, or non-conductive materials such as plastic, rubber, or ceramic, and is shaped to allow the spray composition to be discharged from its tip. A minute space through which the spray composition flows is formed within the nozzle 16 along the longitudinal direction of the nozzle 16. The cross-sectional size of this minute space, expressed in diameter, is preferably 100 μm or more and 1000 μm or less. Nozzle 16 communicates with pump mechanism 14 via conduit 17. Conduit 17 may be conductive or non-conductive. Nozzle 16 is also electrically connected to high-voltage power supply 12, which allows a high voltage to be applied to nozzle 16. In this case, nozzle 16 and high-voltage power supply 12 are electrically connected via current-limiting resistor 19 to prevent excessive current from flowing if a human body comes into direct contact with nozzle 16.

[0034] The pump mechanism 14, which is in communication with the nozzle 16 via a conduit 17, functions as a supply device for supplying the nozzle 16 with the pump mechanism 14 contained in the container 15. The pump mechanism 14 receives power from a low voltage power supply 11 and is configured to supply a predetermined amount of the spray composition to the nozzle 16 under the control of an auxiliary electrical circuit 13.

[0035] A container 15 is connected to the pump mechanism 14 via a flexible conduit 18. A spray composition is contained in the container 15. The pump mechanism 14 is preferably a gear pump or piston pump. The container 15 is preferably in the form of a replaceable cartridge.

[0036] An electrostatic spray device 10 having the above configuration can be used, for example, as shown in FIG. 2. FIG. 2 shows a handheld electrostatic spray device 10 that is small enough to be held in one hand. In the electrostatic spray device 10 shown in the figure, all of the components shown in the structural diagram of FIG. 1 are housed in a cylindrical housing 20. A nozzle (not shown) is disposed at one longitudinal end 10a of the housing 20. The nozzle is disposed in the housing 20 so that the spray direction of the composition coincides with the vertical direction of the housing 20 and so that the nozzle is convex toward the skin side, which is the object to be coated. By arranging the nozzle tip so that it is convex toward the object to be coated in the vertical direction of the housing 20, the spray composition is less likely to adhere to the housing, allowing for stable formation of a coating.

[0037] When the skin to be coated is the user's own skin, the electrostatic spray device 10 is operated by the user, i.e., the person who will be coating their own skin with electrostatic spray, holding the device 10 in their hand and pointing one end 10a of the device 10, where the nozzle (not shown) is located, toward the area to be electrostatically sprayed. Figure 2 shows the electrostatic spray device 10 with one end 10a facing the inside of the user's forearm. In this state, the device 10 is turned on to perform the electrostatic spraying method. When the device 10 is turned on, an electric field is generated between the nozzle and the skin. In the embodiment shown in Figure 2, a positive high voltage is applied to the nozzle, and the skin serves as the negative electrode. When an electric field is generated between the nozzle and the skin, the spray composition at the tip of the nozzle is polarized by electrostatic induction, forming a cone-like tip. Droplets of the charged spray composition are expelled from the tip of the cone into the air along the electric field toward the skin. As the solvent component (a) evaporates from the charged spray composition discharged into space, the charge density on the surface of the spray composition becomes excessive, causing it to repeatedly break down into smaller particles due to Coulomb repulsion, spreading through the space and reaching the skin. In this case, by appropriately adjusting the viscosity of the spray composition, the sprayed composition can be made to reach the skin in the form of droplets. Alternatively, while the spray composition is being discharged into space, the volatile solvent component (a) can be evaporated from the composition, solidifying the solute film-forming polymer and forming fibers through elongation and deformation due to the potential difference, which can then be deposited on the skin surface. For example, increasing the viscosity of the spray composition makes it easier to deposit the composition in the form of fibers on the skin surface. This allows a coating consisting of fiber deposits to form on the skin surface. A coating consisting of fiber deposits can also be formed by adjusting the distance between the nozzle and the skin or the voltage applied to the nozzle.

[0038] During electrostatic spraying, a high potential difference occurs between the nozzle and the skin, which is the object to be coated. However, because the impedance is very large, the current flowing through the human body is extremely small. The inventors have confirmed that the current flowing through the human body during electrostatic spraying is several orders of magnitude smaller than the current flowing through the human body due to static electricity generated in everyday life.

[0039] When a fiber deposit is formed by electrostatic spraying, the thickness of the fiber, expressed in terms of circle-equivalent diameter, is preferably 10 nm or more, more preferably 50 nm or more. It is also preferably 3000 nm or less, more preferably 1000 nm or less. The fiber thickness can be measured, for example, by observing the fibers at 10,000x magnification using a scanning electron microscope (SEM). After removing defects (fiber clumps, fiber intersections, and droplets) from the two-dimensional image, 10 fibers are randomly selected, a line is drawn perpendicular to the longitudinal direction of the fibers, and the fiber diameter is directly read.

[0040] In principle, the fibers described above are continuous fibers of infinite length, but preferably have a length at least 100 times the fiber diameter. In this specification, fibers having a length 100 times the fiber diameter are defined as "continuous fibers." The coating produced by the electrostatic spray method is preferably a porous, discontinuous coating composed of a deposit of continuous fibers. This type of coating not only can be handled as a single sheet, but also has the advantages of being very soft, not easily broken up even when shear force is applied, and having excellent conformity to body movements. Another advantage is that it has excellent dissipation properties for sweat generated from the skin. Another advantage is that the coating can be easily peeled off. In contrast, continuous coatings without pores are difficult to peel off and have very poor sweat dissipation properties, making them prone to causing stuffiness on the skin.

[0041] The fibrous spray composition reaches the skin in an electrically charged state. As mentioned above, the skin is also electrically charged, so the fibers adhere to the skin due to electrostatic force. The surface of the skin has fine irregularities such as texture, and this, combined with the anchoring effect of these irregularities, helps the fibers adhere more closely to the skin surface. Once electrostatic spraying is complete, the power to the electrostatic spray device 10 is turned off. This eliminates the electric field between the nozzle and the skin, and the charge is fixed on the skin surface. As a result, the adhesion of the coating is further enhanced.

[0042] The above description has been about a porous coating made of a fiber deposit, but the form of the coating is not limited to this, and a continuous coating without pores may be formed, or a porous coating having a form other than a fiber deposit, for example, a porous coating made of a continuous coating with a plurality of through holes formed irregularly or regularly, i.e., a discontinuous coating, may be formed. As described above, a coating of any shape can be formed by controlling the viscosity of the spray composition, the distance between the nozzle and the skin, the voltage applied to the nozzle, etc.

[0043] The distance between the nozzle and the skin depends on the voltage applied to the nozzle, but is preferably 50 mm or more and 150 mm or less in order to successfully form a coating. The distance between the nozzle and the skin can be measured using a commonly used non-contact sensor or the like.

[0044] Regardless of whether the coating formed by electrostatic spraying is porous or not, the basis weight of the coating shall be 0.1 g / m 2 It is preferable that the content is 1 g / m or more. 2 More preferably, it is 30 g / m or more. 2 Preferably, it is 20 g / m or less. 2 For example, the basis weight of the coating is 0.1 g / m or less. 2 More than 30g / m 2 It is preferable that the content is less than 1 g / m 2 More than 20g / m 2It is even more preferable that the coating has a basis weight of 1000 or less. By setting the basis weight of the coating in this manner, the adhesion of the coating can be improved. The process of forming a coating on the skin surface by electrostatic spraying includes (1) a process of electrostatically spraying directly onto the skin to form a coating; and (2) a process in which a user or an assistant electrostatically sprays the composition onto an object other than the skin to produce a sheet made of fibers, and then applies the sheet to the skin. The electrostatic spray device in this case is a handy electrostatic spray device that can be held in the hand, and is also called an electrospinning spray device.

[0045] Next, step B will be described. Step B is a step of applying to the skin a composition Y other than composition X (a composition to be sprayed), which contains components (c) and (d) in amounts such that the mass ratio of components (d) to (c) ((d) / (c)) is 0.25 or more and 2 or less. Step B is carried out before or after step A of electrostatic spraying. (c) 1% by mass or more and 20% by mass or less of a water-insoluble polymer having a glass transition temperature of -20°C or more and 25°C or less; (d) A polyol having two hydroxyl groups.

[0046] This step B is a step in which composition Y is applied to the skin by a means other than electrostatic spraying.

[0047] The water-insoluble polymer (c) with a glass transition temperature of -20°C or higher and 25°C or lower used in composition Y not only strengthens the network of the film formed on the skin by electrostatic spraying but also enhances its adhesion to the skin, contributing to improved adhesion over time and improved abrasion resistance, as well as improving the finish properties of the film, such as smoothness and gloss, and improving their durability.In addition, it prevents makeup from coming off due to sebum after foundation application and reduces shine in the T-zone. Here, the glass transition point of the water-insoluble polymer (c) used in composition Y is preferably −20° C. or higher and 25° C. or lower, more preferably −20° C. or higher and 20° C. or lower, even more preferably −20° C. or higher and 10° C. or lower, and even more preferably −15° C. or higher and 5° C. or lower, from the viewpoints of improving the adhesion of the coating over a long period of time, improving the durability of finish properties such as smoothness and gloss, and improving the durability of makeup after application of the foundation. Furthermore, it is preferable that the polymer (c) used in composition Y is a water-insoluble polymer from the viewpoints of improving the adhesion of the coating over a long period of time, improving the durability of finish properties such as smoothness and luster, and improving the durability of makeup after applying the foundation. Here, water-insolubility in a water-insoluble polymer means that, when 1 g of the polymer is weighed and immersed in 10 g of ion-exchanged water under an environment of 1 atmosphere and 23°C, 0.5 g or more of the immersed polymer does not dissolve after 24 hours.

[0048] Examples of the water-insoluble polymer (c) include rubber-based polymers, silicone-based polymers, acrylic polymers, and urethane-based polymers having a glass transition point of -20°C or higher and 25°C or lower, and one or more selected from these can be used. Furthermore, the water-insoluble polymer (c) can be at least one selected from nonionic polymers, anionic polymers, cationic polymers, and amphoteric polymers. The water-insoluble polymer (c) is preferably a polymer other than the polymer of component (b).

[0049] Examples of rubber-based polymers include natural rubber; polyisoprene rubber, styrene-butadiene (SB) rubber, styrene-isoprene (SI) rubber, styrene-isoprene-styrene block copolymer (SIS) rubber, styrene-butadiene-styrene block copolymer (SBS) rubber, styrene-ethylene-butylene-styrene block copolymer (SEBS) rubber, styrene-ethylene-propylene-styrene block copolymer (SEPS) rubber, styrene-ethylene-propylene block copolymer (SEP) rubber, reclaimed rubber, butyl rubber, polyisobutylene, and synthetic rubbers such as modified versions of these rubbers as base polymers. Among these rubber-based polymers, at least one selected from styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, styrene-butadiene rubber, polyisobutylene, isoprene rubber, and silicone rubber is more preferred. An example of a commercially available rubber-based polymer is Yodozole GH41F (manufactured by Akzo Nobel) (Tg: 5°C).

[0050] Examples of acrylic polymers include acrylic polymers having as a base polymer an acrylic polymer (homopolymer or copolymer) using one or more (meth)acrylic acid alkyl esters as a monomer component. Specific examples of (meth)acrylic acid alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, and (meth)acrylate. Examples of (meth)acrylic acid C1-20 alkyl esters include nonyl acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, octadecyl (meth)acrylate, nonadecyl (meth)acrylate, and eicosyl (meth)acrylate. Examples of secondary monomers that can be used together with these base polymers include N-vinylpyrrolidone, methylvinylpyrrolidone, (meth)acrylic acid, vinyl acetate, etc. Commercially available acrylic polymers include Yodozole GH256F (particle size 20 to 40 nm; manufactured by Akzo Nobel) (Tg: 5°C), Yodozole GH34F (manufactured by Akzo Nobel) (Tg: -5°C), Yodozole GH800F (manufactured by Akzo Nobel) (Tg: -15°C), Yodozole GH810F (manufactured by Akzo Nobel) (Tg: 20°C), Daitosol 5000AD (manufactured by Daito Chemical Industry Co., Ltd.) (Tg: -14°C), and Daitosol 5000SJ (manufactured by Daito Chemical Industry Co., Ltd.) (Tg: -13°C).

[0051] As the silicone polymer, for example, a silicone polymer having a base polymer of silicone rubber or silicone resin containing organopolysiloxane is preferably used. As the base polymer constituting the silicone polymer, a base polymer obtained by crosslinking the above silicone rubber or silicone resin may be used. As the silicone rubber, for example, an organopolysiloxane containing dimethylsiloxane as a constituent unit may be mentioned. If necessary, a functional group (for example, a vinyl group) may be introduced into the organopolysiloxane. As the silicone resin, for example, R3SiO 1 / 2 Building block, SiO2 building block, RSiO 3 / 2 Examples of suitable crosslinking agents include organopolysiloxanes containing at least one structural unit selected from the group consisting of an R2SiO structural unit and an R2SiO structural unit. The silicone polymer may contain a crosslinking agent. Examples of crosslinking agents include siloxane-based crosslinking agents and peroxide-based crosslinking agents. Any appropriate crosslinking agent can be used as the peroxide-based crosslinking agent. Examples of suitable peroxide-based crosslinking agents include benzoyl peroxide, t-butyl peroxybenzoate, and dicumyl peroxide. Examples of suitable siloxane-based crosslinking agents include polyorganohydrogensiloxane.

[0052] Examples of urethane-based polymers include urethane resins obtained by reacting polyols with polyisocyanate compounds. Examples of polyols include polyether polyols, polyester polyols, polycarbonate polyols, and polycaprolactone polyols. Examples of polyisocyanate compounds include diphenylmethane diisocyanate, tolylene diisocyanate, and hexamethylene diisocyanate. Examples of commercially available urethane-based polymers include Baycusan C1003 (manufactured by Covestro Deutschland AG) (Tg: 5°C).

[0053] The nonionic polymer is not particularly limited, and any nonionic polymer commonly used in the field of cosmetics can be used. Component (c) may contain one or more nonionic polymers, and may further contain one or more anionic, cationic, and / or amphoteric polymers in combination with the nonionic polymers.

[0054] Examples of nonionic polymers include (meth)acrylic water-soluble nonionic polymers, (meth)acrylic water-insoluble nonionic polymers, polyvinylpyrrolidone, polyacrylamide, low-saponification polyvinyl alcohol (saponification degree 60 mol% or less), neutral polysaccharides and their derivatives (ethers, esters, etc.). Examples of neutral sugars and their derivatives include neutral gums (guar gum, hydroxypropyl guar, etc.), cellulose ethers (hydroxyethyl cellulose (HEC), methylhydroxyethyl cellulose (MHEC), ethylhydroxyethyl cellulose (EHEC), methylethylhydroxyethyl cellulose (MEHEC), hydroxypropyl cellulose (HPC), hydroxypropylmethyl cellulose (HPMC), and their hydrophobic derivatives (HM-EHEC, etc.)), starch and its derivatives (dextrin, etc.).

[0055] Examples of compounds having an ethylenically unsaturated bond that can constitute nonionic polymers such as the (meth)acrylic water-soluble nonionic polymer, the (meth)acrylic water-insoluble nonionic polymer, polyvinylpyrrolidone, polyacrylamide, and low-saponification polyvinyl alcohol (saponification degree 60 mol % or less) are given below, but the present invention is not limited to these specific examples. Examples of nonionic monomers include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, n-pentyl (meth)acrylate, n-hexyl (meth)acrylate, cyclohexyl (meth)acrylate, n-heptyl (meth)acrylate, n-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and nonionic (meth)acrylate. acrylate, decyl (meth)acrylate, dodecyl (meth)acrylate, phenyl (meth)acrylate, toluyl (meth)acrylate, benzyl (meth)acrylate, isobornyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 3-methoxybutyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, stearyl (meth)acrylate, glycidyl (meth)acrylate, 2-aminoethyl (meth)acrylate, γ-((meth)acryloyloxypropyl) (meth)trimethoxysilane, γ-((meth)acryloyloxypropyl)dimethoxymethylsilane, ethylene oxide adduct of (meth)acrylic acid, trifluoromethylmethyl (meth)acrylate, 2-trifluoromethylethyl (meth)acrylate, 2-perfluoroethylethyl (meth)acrylate, 2-perfluoroethyl-2-perfluorobutylethyl (meth)acrylate, 2-perfluoroethyl (meth)acrylate, perfluoromethyl (meth)acrylate, diperfluoromethylmethyl (meth)acrylate (Meth)acrylic acid esters such as 2-perfluoromethyl-2-perfluoroethylmethyl (meth)acrylate, 2-perfluorohexylethyl (meth)acrylate, 2-perfluorodecylethyl (meth)acrylate, and 2-perfluorohexadecylethyl (meth)acrylate; aromatic alkenyl compounds such as styrene, α-methylstyrene, p-methylstyrene, and p-methoxystyrene; vinyl cyanide compounds such as acrylonitrile and methacrylonitrile; conjugated diene compounds such as butadiene and isoprene;Halogen-containing unsaturated compounds such as vinyl chloride, vinylidene chloride, perfluoroethylene, perfluoropropylene, and vinylidene fluoride; silicon-containing unsaturated compounds such as vinyltrimethoxysilane and vinyltriethoxysilane; unsaturated carboxylic acid anhydrides such as maleic anhydride; unsaturated dicarboxylic acid diesters such as dialkyl maleates and dialkyl fumarate esters; vinyl ester compounds such as vinyl acetate, vinyl propionate, vinyl pivalate, vinyl benzoate, and vinyl cinnamate; maleimide, N-methylmaleimide, N-ethylmaleimide, N-propylmaleimide, N-butylmaleimide, N-hexylmaleimide, and N-octylmaleimide. Examples of the monomer include maleimide compounds such as N-dodecylmaleimide, N-stearylmaleimide, N-phenylmaleimide, and N-cyclohexylmaleimide; monomers derived from (meth)acrylic acid or (meth)acrylamide and an alkylene oxide having 2 to 4 carbon atoms, such as polyethylene glycol (meth)acrylate, methoxypoly(ethylene glycol / propylene glycol) mono(meth)acrylate, polyethylene glycol di(meth)acrylate, and N-polyalkyleneoxy(meth)acrylamide; and hydrophilic nonionic monomers such as N-vinylpyrrolidone, N-(meth)acryloylmorpholine, and acrylamide.

[0056] Among these, one or more selected from the group consisting of (meth)acrylic water-insoluble nonionic polymers, polyvinylpyrrolidone, and low-saponification polyvinyl alcohol (saponification degree 60 mol% or less) are preferred. Commercially available products include MAS683 (manufactured by Cosmedy Pharmaceuticals), polyvinylpyrrolidone K-90 (manufactured by BASF), and JMR-150L (manufactured by Nippon Vinegar Vipbal Co., Ltd.).

[0057] In this specification, the term "(meth)acrylic" means "acrylic or methacrylic".

[0058] The anionic polymer is not particularly limited, and any anionic polymer commonly used in the field of cosmetics can be used. The liquid preparation can contain one or more anionic polymers, and can further contain one or more nonionic, cationic, and / or amphoteric polymers in combination with the anionic polymer.

[0059] Examples of anionic polymers include anionic polysaccharides and their derivatives (alginates, pectins, hyaluronates, etc.), anionic gums (xanthan gum, dehydroxanthan gum, hydroxypropyl xanthan gum, gum arabic, karaya gum, tragacanth gum, etc.), anionic cellulose derivatives (carboxymethyl cellulose (CMC), etc.), (meth)acrylic water-soluble anionic polymers, and acrylamide water-soluble anionic polymers.

[0060] Examples of compounds having an ethylenically unsaturated bond that can constitute anionic polymers such as the (meth)acrylic water-soluble anionic polymer are listed below, but the present invention is not limited to these specific examples. Examples of anionic monomers include unsaturated carboxylic acid compounds such as (meth)acrylic acid, maleic acid, maleic anhydride, itaconic acid, fumaric acid, and crotonic acid; partial ester compounds of unsaturated polybasic acid anhydrides (e.g., succinic anhydride, phthalic anhydride, etc.) with hydroxyl group-containing (meth)acrylates (e.g., hydroxyethyl (meth)acrylate); compounds having sulfonic acid groups such as styrenesulfonic acid and sulfoethyl (meth)acrylate; and compounds having phosphoric acid groups such as acid phosphooxyethyl (meth)acrylate. These anionic unsaturated monomers can be used as the acid or after partial or complete neutralization, or can be subjected to copolymerization as the acid and then partially or completely neutralized. Examples of basic compounds used for neutralization include alkali metal hydroxides such as potassium hydroxide and sodium hydroxide, aqueous ammonia, and amine compounds such as mono-, di-, and triethanolamine, and trimethylamine.

[0061] Among these, water-insoluble acrylic anionic polymers are particularly preferred. Commercially available products include MASCOS10 (manufactured by Cosmedy Pharmaceuticals) and HiPAS10 (manufactured by Cosmedy Pharmaceuticals).

[0062] Emulsifying thickeners containing these nonionic or anionic polymers can also be used, such as polyacrylamide / (C13,C14) isoparaffin / laureth-7 (Sepigel 305, manufactured by Seppic).

[0063] The cationic polymer is not particularly limited, and any cationic thickening polymer commonly used in the field of cosmetics can be used. The liquid agent can contain one or more cationic polymers, and can further contain one or more nonionic, anionic, and / or amphoteric polymers in combination with the cationic polymer.

[0064] Cationic polymers are polymers that contain cationic groups, such as quaternary ammonium groups, or groups that can ionize to cationic groups, such as primary, secondary, or tertiary amino groups. Cationic polymers are typically polymers that contain amine or ammonium groups in the side chains of the polymer chain, or polymers that contain diallyl quaternary ammonium salts as building blocks.

[0065] Preferred cationic polymers include, for example, cationized cellulose, cationic starch, cationic guar gum, vinyl or (meth)acrylic polymers or copolymers having quaternary ammonium side chains, quaternized polyvinylpyrrolidone, (meth)acrylate / aminoacrylate copolymers, amine-substituted poly(meth)acrylate crosspolymers, (meth)acrylic water-soluble cationic polymers, and acrylamide water-soluble cationic polymers.

[0066] Examples of compounds having an ethylenically unsaturated bond that can constitute a cationic polymer such as the (meth)acrylic water-soluble cationic polymer are given below, but the present invention is not limited to these specific examples. Examples of cationic monomers include N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, N,N-dimethylaminopropyl (meth)acrylate, N,N-diethylaminopropyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylamide, N,N-diethylaminoethyl (meth)acrylamide, N,N-dimethylaminopropyl (meth)acrylamide, N,N-diethylaminopropyl (meth)acrylamide, p-dimethylaminomethylstyrene, p-dimethylaminopropyl (meth)acrylamide ... Examples of the cationic monomer include methylaminoethylstyrene, p-diethylaminomethylstyrene, p-diethylaminoethylstyrene, and the like, cationized with a cationizing agent (for example, alkyl halides such as methyl chloride, methyl bromide, and methyl iodide; dialkyl sulfates such as dimethyl sulfate; epichlorohydrin adducts of tertiary amine mineral acid salts such as N-(3-chloro-2-hydroxypropyl)-N,N,N-trimethylammonium chloride; inorganic salts such as hydrochloric acid, hydrobromic acid, sulfuric acid, and phosphoric acid; and carboxylic acids such as formic acid, acetic acid, and propionic acid).

[0067] Specific examples of cationized cellulose include a polymer of a quaternary ammonium salt obtained by adding glycidyltrimethylammonium chloride to hydroxyethylcellulose (Polyquaternium-10), a hydroxyethylcellulose / dimethyldiallylammonium chloride copolymer (Polyquaternium-4), and a polymer of a quaternary ammonium salt obtained by reacting hydroxyethylcellulose with a trimethylammonium-substituted epoxide and a lauryldimethylammonium-substituted epoxide (Polyquaternium-67).

[0068] An example of a vinyl or (meth)acrylic polymer or copolymer having quaternary ammonium side chains is poly(2-methacryloxyethyltrimethylammonium chloride) (Polyquaternium-37).

[0069] A specific example of quaternized polyvinylpyrrolidone is a quaternary ammonium salt (polyquaternium-11) synthesized from a copolymer of vinylpyrrolidone (VP) and dimethylaminoethyl methacrylate, and diethyl sulfate.

[0070] Examples of (meth)acrylate / aminoacrylate copolymers include (acrylates / aminoacrylates / C10-30 alkyl PEG-20 itaconic acid) copolymers.

[0071] Examples of amine-substituted poly(meth)acrylate crosspolymers include polyacrylate-1 crosspolymer and polyquaternium-52.

[0072] Among these, acrylamide-based water-soluble cationic polymers are particularly preferred. Commercially available products include t-butylacrylamide / ethyl acrylate / dimethylaminopropylacrylamide / methoxypolyethylene glycol methacrylate copolymer (RP77S, manufactured by Kao Corporation).

[0073] Amphoteric polymers are polymers that contain both cationic and anionic groups. From a structural standpoint, amphoteric polymers can be derived from any of the cationic polymers described above by further incorporating anionic groups or comonomers.

[0074] Any amphoteric polymer commonly used in the field of cosmetics can be used as the amphoteric polymer. The liquid preparation can contain one or more amphoteric polymers, and can further contain a nonionic, anionic, and / or cationic polymer in combination with the amphoteric polymer.

[0075] Examples of amphoteric polymers include carboxyl- or sulfonic acid-modified cationic polysaccharides (such as carboxymethylchitosan), (meth)acrylate polymers having phosphobetaine groups or sulfobetaine groups in the side chains, and (meth)acrylic amphoteric polymers.

[0076] Examples of compounds having an ethylenically unsaturated bond that can constitute an amphoteric polymer such as the (meth)acrylic amphoteric polymer are given below, but the present invention is not limited to these examples. Specific examples of amphoteric monomers include compounds obtained by reacting the specific examples of cationic monomer precursors described above with a modifying agent such as sodium or potassium haloacetate. Specific examples of polarizable monomers include amine oxides such as N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, N,N-dimethylaminopropyl (meth)acrylate, N,N-diethylaminopropyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylamide, N,N-diethylaminoethyl (meth)acrylamide, N,N-dimethylaminopropyl (meth)acrylamide, N,N-diethylaminopropyl (meth)acrylamide, N,N-dimethylaminovinyl propionate, p-dimethylaminomethylstyrene, p-dimethylaminoethylstyrene, p-diethylaminomethylstyrene, and p-diethylaminoethylstyrene.

[0077] Other examples include copolymers of cationic vinyl or (meth)acrylic monomers with (meth)acrylic acid, such as dimethyldiallylammonium chloride / acrylic acid copolymer (Polyquaternium-22).

[0078] The water-insoluble polymer (c) used in composition Y is preferably an acrylic polymer, from the viewpoints of improving the adhesion of the coating over a long period of time, improving the durability of finish properties such as smoothness and luster, and improving the durability of makeup after foundation application, and more preferably an acrylic polymer whose base polymer is an acrylic polymer (homopolymer or copolymer) using one or more types of (meth)acrylic acid alkyl esters as monomer components.

[0079] The water-insoluble polymer (c) is preferably contained in the composition Y as an emulsion, and the average particle size of the emulsion is preferably 10 nm or more and 400 nm or less, more preferably 10 nm or more and 300 nm or less, and even more preferably 20 nm or more and 200 nm or less, from the viewpoints of improving the adhesion of the coating over a long period of time, improving the durability of finish properties such as smoothness and gloss, and improving the durability of makeup after application of the foundation. Here, the average particle size of the emulsion is measured by a light scattering method (for example, it can be measured using a zeta potential / particle size measurement system ELSZ-1000ZS manufactured by Otsuka Electronics Co., Ltd.).

[0080] The content of the water-insoluble polymer (c) in composition Y is preferably 1% by mass or more and 20% by mass or less, calculated as solid content, from the viewpoints of improving the adhesion of the coating over time, improving the durability of finish properties such as smoothness and luster, and improving the durability of makeup after application of the foundation. It is more preferably 1.5% by mass or more, even more preferably 2% by mass or more, and even more preferably 2.5% by mass or more. It is also more preferably 15% by mass or less, even more preferably 10% by mass or less, and even more preferably 8% by mass or less. Specifically, it is preferably 1.5% by mass or more and 15% by mass or less, more preferably 2% by mass or more and 10% by mass or less, and even more preferably 2.5% by mass or more and 8% by mass or less.

[0081] The component (d) used in the composition Y is a polyol having two hydroxyl groups. By using a polyol having two hydroxyl groups as component (d), it is possible to achieve improved adhesion of the coating over a long period of time, improved durability of finish properties such as smoothness and gloss, and improved durability of makeup after foundation application. Examples of polyols having two hydroxyl groups include diols having an aliphatic hydrocarbon group having two or more carbon atoms and diols having a cyclic aliphatic hydrocarbon group having three or more carbon atoms. Diols having one or two aliphatic hydrocarbon groups having two to six carbon atoms and diols having one or two cyclic aliphatic hydrocarbon groups having three to six carbon atoms are preferred. Examples include alkylene glycols such as ethylene glycol, propylene glycol, 1,3-propanediol, and 1,3-butanediol; and dialkylene glycols such as diethylene glycol and dipropylene glycol. Here, the alkylene group of the alkylene glycol and dialkylene glycol is preferably an alkylene group having two to four carbon atoms. Of these, from the viewpoints of improving the adhesion of the coating over a long period of time, improving the finish, and improving the durability of the finish, ethylene glycol, propylene glycol, 1,3-butanediol, and dipropylene glycol are preferred, propylene glycol, dipropylene glycol, and 1,3-butanediol are more preferred, and dipropylene glycol and 1,3-butanediol are even more preferred. These polyols having two hydroxyl groups can be used alone or in combination of two or more.

[0082] The content of component (d) in composition Y is preferably from 0.2% by mass to 20% by mass, more preferably from 0.5% by mass to 15% by mass, even more preferably from 0.5% by mass to 10% by mass, and even more preferably from 1% by mass to 8% by mass, from the viewpoints of improving the adhesion of the coating over a long period of time, improving the durability of finish properties such as smoothness and gloss, and improving the durability of makeup after application of the foundation.

[0083] The mass ratio ((d) / (c)) of component (d) to component (c) in composition Y is 0.25 or more and 2.5 or less, from the viewpoints of improving the adhesion of the coating film over a long period of time, improving the durability of finish properties such as smoothness and luster, and improving the durability of makeup after application of the foundation. Furthermore, from the viewpoints of improving the adhesion of the coating film over a long period of time, improving the finish properties, and improving the durability of the finish, (d) / (c) is preferably 0.28 or more and 2 or less, and more preferably 0.3 or more and 2 or less.

[0084] In addition to the components (c) and (d), composition Y may contain (e) one or more liquid oils selected from hydrocarbon oils, ester oils, and ether oils. The content of these liquid oils in composition Y is preferably 0.2% by mass or less, from the viewpoints of improving the adhesion of the coating over a long period of time, improving the durability of finish properties such as smoothness and gloss, and improving the durability of makeup after application of the foundation. The liquid oil is an oil that is liquid at 20°C.

[0085] Examples of the liquid hydrocarbon oil include liquid paraffin, squalane, squalene, n-octane, n-heptane, cyclohexane, light isoparaffin, liquid isoparaffin, hydrogenated polyisobutene, polybutene, and polyisobutene. From the viewpoint of usability, liquid paraffin, light isoparaffin, liquid isoparaffin, squalane, squalene, n-octane, n-heptane, and cyclohexane are preferred, and liquid paraffin and squalane are more preferred. Furthermore, from the viewpoint of the adhesion and abrasion resistance of the electrostatically sprayed coating, the viscosity of the hydrocarbon oil at 20°C is preferably 1 mPa·s or more, and more preferably 3 mPa·s or more. The viscosity here is measured at 20°C using a BM-type viscometer (manufactured by Tokimec Co., Ltd., measurement conditions: rotor No. 1, 60 rpm, 1 minute).

[0086] Examples of the ester oil include esters of straight-chain or branched-chain fatty acids and straight-chain or branched-chain alcohols or polyhydric alcohols.Specifically, these include isopropyl myristate, cetyl isooctanoate, isocetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, decyl oleate, octyldodecyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, ethylhexyl isononanoate, isononyl isononanoate, isotridecyl isononanoate, isostearyl isostearate, and 12-hydroxystearyl Cholesteryl diol, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, propylene glycol dicaprylate, propylene glycol diisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate , Trimethylolpropane Triisostearate, Cetyl 2-Ethylhexanoate, 2-Ethylhexyl Palmitate, Diethylhexyl Naphthalenedicarboxylate, Benzoate (C12-15) Alkyl, Cetearyl Isononanoate, Tri(Caprylic / Capric) Glycerin, Butylene Glycol (Dicaprylic / Capric), Propylene Glycol (Dicaprylic / Capric), Glyceryl Triisostearate, Glyceryl Tri-2-Heptylundecanoate, Glyceryl Cocoate, Castor Oil Fatty Acid Methyl Ester, O Examples of suitable alkyl acrylates include oleyl leate, 2-heptylundecyl palmitate, diisobutyl adipate, 2-octyldodecyl N-lauroyl-L-glutamate, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, di-2-ethylhexyl succinate, triethyl citrate, 2-ethylhexyl paramethoxycinnamate, and tripropylene glycol dipivalate. Among these, from the viewpoint of adhering the electrostatically sprayed coating to the skin and providing an excellent sensation when applied to the skin, octyldodecyl myristate, myristyl myristate, isocetyl stearate, isononyl isononanoate, isocetyl isostearate, cetearyl isononanoate, diisobutyl adipate, di-2-ethylhexyl sebacate, isopropyl myristate, isopropyl palmitate, diisostearyl malate, neopentyl glycol dicaprate, Preferably, at least one selected from isopropyl myristate, isopropyl palmitate, diisostearyl malate, neopentyl glycol dicaprate, alkyl benzoate (having 12 to 15 carbon atoms), and tri(caprylic / capric)glycerin is preferred, more preferably at least one selected from neopentyl glycol dicaprate and tri(caprylic / capric)glycerin, and even more preferably at least one selected from neopentyl glycol dicaprate and tri(caprylic / capric)glycerin.

[0087] Furthermore, as the ester oil, vegetable oils and animal oils containing the above-mentioned ester oils can be used, such as olive oil, jojoba oil, macadamia nut oil, medfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, apricot kernel oil, rice germ oil, and rice bran oil.

[0088] Examples of the ether oil include alkyl-1,3-dimethylbutyl ethers such as cetyl dimethyl butyl ether, ethylene glycol dioctyl ether, glycerol monooleyl ether, and dicaprylyl ether, and one or more selected from these can be used. It is more preferable to use cetyl-1,3-dimethylbutyl ether as the ether oil.

[0089] In addition to the liquid oil (e), composition Y can also contain an oil (solid oil) that is solid at 20° C. The content of oil (solid oil) that is solid at 20° C. in composition Y is preferably 0.2% by mass or less, and more preferably substantially zero, from the viewpoints of improving the adhesion of the coating over a long period of time, improving the durability of finish properties such as smoothness and gloss, and improving the durability of makeup after foundation application. An oil agent that is solid at 20°C is one that exhibits solid properties at 20°C and has a melting point of 40°C or higher. Examples of oil agents that are solid at 20°C include hydrocarbon waxes, ester waxes, parahydroxybenzoic acid esters, higher alcohols, linear fatty acid esters having 14 or more carbon atoms, triglycerides composed of three linear fatty acids having 12 or more carbon atoms, and silicone waxes. One or more selected from these may be contained. Such waxes are not limited to those commonly used in cosmetics, and include, for example, mineral waxes such as ozokerite and ceresin; petroleum waxes such as paraffin, microcrystalline wax, and petrolatum; synthetic hydrocarbon waxes such as Fischer-Tropsch wax and polyethylene wax; vegetable waxes such as carnauba wax, candelilla wax, rice wax, Japan wax, sunflower wax, and hydrogenated jojoba oil; animal waxes such as beeswax and spermaceti; synthetic waxes such as silicone wax, fluorine-based wax, and synthetic beeswax; fatty acids, higher alcohols, and their derivatives. Furthermore, examples of triglycerides having three straight-chain fatty acids having 12 or more carbon atoms as components include glyceryl trilaurate, glyceryl trimyristate, glyceryl tripalmitate, and glyceryl tribehenate.

[0090] In addition to the above components, composition Y may contain a thickener, a surfactant, a water-soluble polymer, an antioxidant, a fragrance, a colorant, a preservative, a pH adjuster, a blood circulation promoter, a cooling agent, an antiperspirant, a disinfectant, a skin activator, a moisturizer, a refreshing agent, etc. Examples of surfactants include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants.

[0091] The form of composition Y is preferably an aqueous composition from the viewpoints of improving the adhesion of the coating over a long period of time, improving the durability of finish properties such as smoothness and luster, and improving the durability of makeup after application of the foundation. Here, the aqueous composition is a composition based on water, and examples thereof include an aqueous solution, an aqueous dispersion in which other components are dispersed in water, and an oil-in-water emulsion composition.

[0092] The step of applying composition Y to the skin (step B) may be carried out before or after step A, and is preferably carried out before step A. The means for applying composition Y to the skin may be any means other than electrostatic spraying. Examples include a means for applying composition Y to the skin with fingers or the like, preferably a means other than electrostatic spraying in which the composition is discharged as a mist or spray and applied to the skin, such as application to the skin using an applicator such as a puff, nonwoven fabric, or cotton.

[0093] Furthermore, skin can also be made up by applying a cosmetic containing powder to the skin (step C) before, during, or after steps A and B. For example, this can be done in the order of steps A, B, and C, or step B, A, and C. This step C is also preferably carried out by a means other than electrostatic spraying.

[0094] Examples of powders used in the cosmetic preparation in step C include color pigments, extender pigments, pearl pigments, organic powders, etc. Examples of color pigments include inorganic color pigments, organic color pigments, and organic dyes, and these can be used alone or in combination of two or more.

[0095] Specific examples of inorganic color pigments include inorganic color pigments such as red iron oxide, iron hydroxide, iron titanate, yellow iron oxide, black iron oxide, carbon black, Prussian blue, ultramarine, Prussian blue titanium oxide, black titanium oxide, titanium-titanium oxide sintered product, manganese violet, cobalt violet, chromium oxide, chromium hydroxide, cobalt oxide, and cobalt titanate; and inorganic white pigments such as titanium oxide, zinc oxide, calamine, zirconium oxide, magnesium oxide, cerium oxide, aluminum oxide, and composites thereof. These can be used alone or in combination of two or more. Among these, at least one or more selected from iron oxide, titanium oxide, and zinc oxide are preferred, and one or more selected from titanium oxide, zinc oxide, red iron oxide, yellow iron oxide, and black iron oxide are more preferred.

[0096] Examples of organic color pigments and organic dyes include organic tar-based pigments such as Red No. 3, Red No. 102, Red No. 104, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 227, Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Orange No. 203, Orange No. 204, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 401, Blue No. 1, and Blue No. 404; and organic dyes such as beta-carotene, caramel, and paprika color. Also included are those coated with polymers such as cellulose and polymethacrylate esters. Of these, at least Red No. 102 is preferred.

[0097] Examples of extender pigments include barium sulfate, calcium sulfate, magnesium sulfate, magnesium carbonate, calcium carbonate, talc, mica, kaolin, sericite, silicic acid, silicic acid anhydride, aluminum silicate, magnesium silicate, aluminum magnesium silicate, calcium silicate, barium silicate, strontium silicate, metal tungstate, hydroxyapatite, vermiculite, clay, bentonite, montmorillonite, hectorite, smectite, zeolite, ceramic powder, dibasic calcium phosphate, alumina, silica, aluminum hydroxide, boron nitride, synthetic mica, synthetic sericite, metal soap, barium sulfate-treated mica, etc. These can be used alone or in combination. Among these, barium sulfate, calcium carbonate, mica, silicic anhydride, talc, boron nitride, and synthetic mica are preferably included.

[0098] Examples of pearl pigments (glossy powders) include fish scale foil, titanium oxide-coated mica (titanium mica), bismuth oxychloride, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, titanium oxide-coated colored mica, titanium oxide-iron oxide-coated mica, fine particle titanium oxide-coated mica titanium, fine particle zinc oxide-coated mica titanium, organic pigment-treated mica titanium, low-order titanium oxide-coated mica, titanium oxide-coated synthetic mica, titanium oxide-coated plate-like silica, hollow plate-like titanium oxide, iron oxide-coated mica, plate-like iron oxide (MIO), aluminum flakes, stainless steel flakes, titanium oxide-coated plate-like alumina, glass flakes, titanium oxide-coated glass flakes, pearl shells, gold foil, gold-deposited resin films, metal-deposited resin films, etc. These can be used alone or in combination.

[0099] Examples of organic powders include silicone rubber powder, silicone resin-coated silicone rubber powder, polymethylsilsesquioxane, polyamide powder, nylon powder, polyester powder, polypropylene powder, polystyrene powder, polyurethane powder, vinyl resin powder, urea resin powder, phenolic resin powder, fluororesin powder, silicone resin powder, acrylic resin powder, melamine resin powder, polycarbonate resin, divinylbenzene-styrene copolymer, silk powder, wool powder, cellulose powder, long-chain alkyl phosphate metal salt, N-mono long-chain alkyl acyl basic amino acid, and complexes thereof. These can be used alone or in combination of two or more. Of these, cellulose powder, silicone rubber powder, silicone resin-coated silicone rubber powder, polymethylsilsesquioxane, acrylic resin powder, and nylon powder are preferred.

[0100] The powders used in the present invention can be used as they are, or one or more of them can be hydrophobized. The hydrophobization treatment is not limited to any treatment that is applied to ordinary cosmetic powders, and can be dry treatment, wet treatment, or the like, using a surface treatment agent such as a fluorine compound, a silicone compound, a metal soap, an amino acid compound, lecithin, an alkylsilane, an oil, or an organic titanate. Specific examples of surface treatment agents include fluorine-based compounds such as perfluoropolyethers, perfluoroalkyl phosphate esters, perfluoroalkylalkoxysilanes, and fluorine-modified silicones; silicone-based compounds such as dimethylpolysiloxanes, methylhydrogenpolysiloxanes, cyclic silicones, organopolysiloxanes modified with trialkoxy groups at one or both ends, crosslinked silicones, silicone resins, fluorine-modified silicone resins, and acrylic-modified silicones; metal soaps such as aluminum stearate, aluminum myristate, zinc stearate, and magnesium stearate; amino acid compounds such as proline, hydroxyproline, alanine, glycine, sarcosine, glutamic acid, aspartic acid, lysine, and derivatives thereof; lecithin and hydrogenated lecithin; alkylsilanes such as methyltrimethoxysilane, ethyltrimethoxysilane, hexyltrimethoxysilane, octyltrimethoxysilane, and octyltriethoxysilane; oils such as polyisobutylene, wax, and fats and oils; and organic titanates such as isopropyl titanium triisostearate.

[0101] Furthermore, the powder used in the present invention may be one in which one or more of these have been subjected to a hydrophilization treatment. The hydrophilization treatment is not limited as long as it is a treatment that is applied to ordinary cosmetic powders. For example, plant-based polymers such as gum arabic, tragacanth, arabinogalactan, locust bean gum (carob gum), guar gum, karaya gum, carrageenan, pectin, agar, quince seed (quince), starch (rice, corn, potato, wheat), algae colloid, tolanthus gum, and locust bean gum; microbial-based polymers such as xanthan gum, dextran, succinoglucan, and pullulan; animal-based polymers such as collagen, casein, albumin, deoxyribonucleic acid (DNA) and its salts; starch-based polymers such as carboxymethyl starch and methylhydroxypropyl starch; methylcellulose, ethylcellulose, methylhydroxypropylcellulose, carboxymethylcellulose, hydrogels, and the like. Examples of suitable cellulose-based polymers include hydroxymethyl cellulose, hydroxypropyl cellulose, nitrocellulose, sodium cellulose sulfate, sodium carboxymethyl cellulose, crystalline cellulose, and cellulose powder; alginic acid-based polymers such as sodium alginate and propylene glycol alginate; vinyl-based polymers such as polyvinyl methyl ether, polyvinylpyrrolidone, and carboxyvinyl polymer; polyoxyethylene-based polymers such as polyethylene glycol and polyethylene glycol silane; polyoxyethylene-polyoxypropylene copolymer-based polymers; acrylic polymers such as sodium polyacrylate, polyethyl acrylate, and polyacrylic acid amide; and inorganic silicic acid compounds such as silica.

[0102] As the powder, powders commonly used in cosmetics can be used that have shapes such as spherical, plate-like, needle-like, irregular shapes, particle sizes such as mist-like, fine particles, pigment-grade, and particle structures such as porous and non-porous.

[0103] The average particle size of the powder is preferably from 0.001 μm to 200 μm, more preferably from 0.01 μm to 50 μm, even more preferably from 0.02 μm to 20 μm, and even more preferably from 0.05 μm to 10 μm, in order to ensure uniform adhesion to the skin's ridges, sulci, and pores and to provide a natural cosmetic feel. In the present invention, the average particle size of the powder is measured by electron microscope observation or a particle size distribution analyzer using a laser diffraction / scattering method. Specifically, in the case of the laser diffraction / scattering method, ethanol is used as a dispersion medium and measurement is performed using a laser diffraction / scattering particle size distribution analyzer (e.g., LMS-350, manufactured by Seishin Enterprise Co., Ltd.). When the powder has been hydrophobized or hydrophilized, the average particle size and content of component (c) refer to the average particle size and mass including the agent used for the hydrophobization or hydrophilization treatment.

[0104] One or more types of powder can be used, and the content varies depending on the form of the cosmetic, but from the viewpoint of finish, the content in the cosmetic is preferably 1% by mass or more, more preferably 3% by mass or more, even more preferably 5% by mass or more, preferably 99% by mass or less, more preferably 95% by mass or less, and even more preferably 90% by mass or less. The content of the powder in the cosmetic is preferably 1% by mass or more and 99% by mass or less, more preferably 3% by mass or more and 95% by mass or less, and even more preferably 5% by mass or more and 90% by mass or less.

[0105] The mass ratio of the color pigment to the total powder [color pigment / total powder] is preferably 0.2 or more, more preferably 0.3 or more, even more preferably 0.4 or more, and preferably 1.0 or less, from the viewpoints of achieving a good finish, preventing smudging over time, and providing excellent cosmetic durability when the cosmetic contains the powder.

[0106] The type of cosmetic used in step C is not particularly limited as long as it is a powder-containing cosmetic, and can be applied as makeup cosmetics such as a makeup base, foundation, concealer, blusher, eye shadow, mascara, eyeliner, eyebrow cream, overcoat, lipstick, etc.; UV protection cosmetics such as sunscreen emulsion, sunscreen cream, etc. Of these, makeup base, foundation, concealer, sunscreen emulsion, and sunscreen cream are more preferred, and foundation is even more preferred. The form of the cosmetic is also not particularly limited, and may be any of powder cosmetic, solid powder cosmetic, liquid cosmetic, oil-based cosmetic, emulsion cosmetic, and oil-based solid cosmetic.

[0107] Examples of ingredients other than powder contained in the cosmetic used in step C include oils (including liquid oils and solid oils), emulsifiers, water-soluble polymers, fragrances, repellents, antioxidants, stabilizers, preservatives, thickeners, pH adjusters, blood circulation promoters, various vitamins, cooling agents, antiperspirants, disinfectants, skin activators, moisturizers, etc.

[0108] The application of the cosmetic in step C can be carried out by any means other than electrostatic spraying, and can be carried out by any ordinary application means appropriate for the type of cosmetic, such as spreading and pressing the cosmetic with the fingers or palm, or using a dedicated tool to spread and press the cosmetic.

[0109] In relation to the above-described embodiments, the present invention further discloses the following coating production method, composition, and kit.

[0110] <1> A) forming a film on the surface of the skin by electrostatically spraying a composition X containing component (a) and component (b); (a) one or more volatile substances selected from water, alcohols, and ketones; (b) Polymers with film-forming properties B) applying to the skin a composition Y other than composition X, which contains components (c) and (d) in amounts such that the mass ratio of components (d) to (c) ((d) / (c)) is 0.25 or more and 2.5 or less, in this order or in the reverse order. (c) 1% by mass or more and 20% by mass or less of a water-insoluble polymer having a glass transition temperature of -20°C or more and 25°C or less; (d) Polyol having two hydroxyl groups

[0111] <2> Component (a) is preferably a volatile substance containing a C1-C6 monohydric alcohol, more preferably a volatile substance containing ethanol. <1> A method for producing the coating described above. <3> Composition X contains 30% by mass or more and 97% by mass or less, preferably 55% by mass or more and 94% by mass or less, more preferably 60% by mass or more and 92% by mass or less of component (a), and 2% by mass or more and 50% by mass or less, preferably 4% by mass or more and 43% by mass or less, more preferably 6% by mass or more and 36% by mass or less of component (b). <1> or <2> A method for producing the coating described above. <4> The coating formed on the skin surface in step A is a porous coating, and is preferably a porous coating consisting of a deposit of fibers. <1> ~ <3> 10. A method for producing the coating according to any one of the preceding claims. <5> Composition X further contains a component selected from a polyol that is liquid at 20°C and an oil component that is liquid at 20°C. <1> ~ <4> 10. A method for producing the coating according to any one of the preceding claims. <6> The glass transition point of the water-insoluble polymer (c) used in composition Y is preferably −20° C. or higher and 20° C. or lower, more preferably −20° C. or higher and 10° C. or lower, and even more preferably −15° C. or higher and 5° C. or lower. <1> ~ <5> 10. A method for producing the coating according to any one of the preceding claims. <7> (c) The water-insoluble polymer is one or more selected from rubber-based polymers, silicone-based polymers, acrylic-based polymers, and urethane-based polymers, or at least one selected from nonionic polymers, anionic polymers, cationic polymers, and amphoteric polymers, and is a polymer other than the polymer of component (b). <1> ~ <6> 10. A method for producing the coating according to any one of the preceding claims. <8> (c) The water-insoluble polymer is preferably an acrylic polymer, and more preferably an acrylic polymer having as its base polymer an acrylic polymer (homopolymer or copolymer) using one or more (meth)acrylic acid alkyl esters as monomer components. <1> ~ <7> 10. A method for producing the coating according to any one of the preceding claims. <9> The water-insoluble polymer (c) is preferably contained in the composition Y as an emulsion, and the average particle size of the emulsion is preferably 10 nm or more and 400 nm or less, more preferably 10 nm or more and 300 nm or less, and even more preferably 20 nm or more and 200 nm or less. <1> ~ <8> 10. A method for producing the coating according to any one of the preceding claims. <10> The content of the water-insoluble polymer (c) in the composition Y is preferably 1.5% by mass or more and 15% by mass or less, more preferably 2% by mass or more and 10% by mass or less, and even more preferably 2.5% by mass or more and 8% by mass or less, calculated as solid content. <1> ~ <9> 10. A method for producing the coating according to any one of the preceding claims. <11> Component (d) is preferably one or more selected from diols having one or two aliphatic hydrocarbon groups with 2 to 6 carbon atoms and diols having one or two cycloaliphatic hydrocarbon groups with 3 to 6 carbon atoms, more preferably one or more selected from alkylene glycols and dialkylene glycols, even more preferably one or more selected from ethylene glycol, propylene glycol, 1,3-butanediol and dipropylene glycol, and even more preferably one or more selected from propylene glycol, dipropylene glycol and 1,3-butanediol. <1> ~ <10> 10. A method for producing the coating according to any one of the preceding claims. <12> The content of component (d) in composition Y is preferably 0.2% by mass or more and 20% by mass or less, more preferably 0.5% by mass or more and 15% by mass or less, even more preferably 0.5% by mass or more and 10% by mass or less, and even more preferably 1% by mass or more and 8% by mass or less. <1> ~ <10> 10. A method for producing the coating according to any one of the preceding claims. <13> The mass ratio ((d) / (c)) of component (d) to component (c) in composition Y is preferably 0.28 or more and 2 or less, more preferably 0.3 or more and 2 or less. <1> ~ <12> 10. A method for producing the coating according to any one of the preceding claims. <14> The composition Y further contains (e) 0.2 mass% or less of one or more liquid oils selected from hydrocarbon oils, ester oils, and ether oils. <1> ~ <13> 10. A method for producing the coating according to any one of the preceding claims. <15> Step B is a step of applying composition Y to the skin by a means other than electrostatic spraying. <1> ~ <14> 10. A method for producing the coating according to any one of the preceding claims. <16> Composition Y is preferably a water-based composition. <1> ~ <15> 10. A method for producing the coating according to any one of the preceding claims. <17> a step of applying a cosmetic containing powder to the skin is further carried out before or after step A) and step B). <1> ~ <16> 10. A method for producing the coating according to any one of the preceding claims. <18> Step A) is a step of forming a coating consisting of a fiber deposit by electrostatically spraying composition X onto the skin using an electrostatic spray device, and the electrostatic spray device is equipped with a container for containing composition X, a nozzle for discharging composition X, a supply device for supplying composition X contained in the container to the nozzle, and a power source for applying a voltage to the nozzle. <1> ~ <17> 10. A method for producing the coating according to any one of the preceding claims. <19> The step of forming a film on the skin surface by electrostatic spraying is a step of electrostatically spraying directly onto the skin to form a film, or a step of a user or assistant electrostatically spraying composition X onto an object other than the skin to prepare a sheet made of fibers, and then applying the sheet to the skin. <1> ~ <18> 10. A method for producing the coating according to any one of the preceding claims.

[0112] <20> Composition Y is used to produce a coating on the skin by applying it to the skin before or after forming a coating on the skin surface by electrostatic spraying, and contains component (c) and component (d) in amounts such that the mass ratio of component (d) to component (c) ((d) / (c)) is 0.25 or more and 2.5 or less. (c) 1% by mass or more and 20% by mass or less of a water-insoluble polymer having a glass transition temperature of -20°C or more and 25°C or less; (d) Polyol having two hydroxyl groups <21> The composition used for electrostatic spraying is composition X containing component (a) and component (b). <20> Composition Y as described. (a) one or more volatile substances selected from water, alcohols, and ketones; (b) Polymers with film-forming properties <22> A kit for producing a coating on the skin containing composition X and composition Y, Composition X is a composition containing component (a) and component (b) and is used for electrostatic spraying to form a film on the surface of the skin, (a) one or more volatile substances selected from water, alcohols, and ketones; (b) Polymers with film-forming properties The kit comprises composition Y, which contains components (c) and (d) in amounts such that the mass ratio of components (d) to (c) ((d) / (c)) is 0.25 or more and 2.5 or less, and which is to be applied to the skin before or after the formation of a film on the skin by electrostatic spraying of composition X. (c) 1% by mass or more and 20% by mass or less of a water-insoluble polymer having a glass transition temperature of -20°C or more and 25°C or less; (d) Polyol having two hydroxyl groups [Example]

[0113] The present invention will be described in more detail below with reference to examples. However, the scope of the present invention is not limited to such examples. Unless otherwise specified, "%" means "% by mass."

[0114] Synthesis Example 1 (Production of poly(N-propionylethyleneimine)-modified silicone) 19.0 g (0.12 mol) of diethyl sulfate and 81.0 g (0.82 mol) of 2-ethyl-2-oxazoline were dissolved in 203.0 g of dehydrated ethyl acetate and heated under reflux for 8 hours under a nitrogen atmosphere to synthesize terminally reactive poly(N-propionylethyleneimine). The number-average molecular weight was measured by GPC and found to be 1100. To this was added 300 g of a 33% ethyl acetate solution of side-chain primary aminopropyl-modified polydimethylsiloxane (weight-average molecular weight 32,000, amine equivalent 2,000) in one portion, and the mixture was heated under reflux for 10 hours. The reaction mixture was concentrated under reduced pressure to obtain N-propionylethyleneimine-dimethylsiloxane copolymer as a pale yellow rubbery solid (390 g, 97% yield). The organopolysiloxane segment content of the final product was 75% by mass, and the weight-average molecular weight was 40,000. Neutralization titration with hydrochloric acid using methanol as a solvent revealed that approximately 20 mol % of amino groups remained. The polymer had a glass transition temperature of 45°C.

[0115] [Test 1] [Examples 1 to 7, Comparative Examples 1 to 4] (1) Preparation of spray composition The compositions shown in Table 1 were used as spray compositions. (2) Preparation of Composition Y The liquid preparation (composition Y) shown in Table 2 was used. (3) Evaluation step It was applied to the skin in steps (a), (b), (c), and (d). A. A commercially available skin care product was applied to the skin. A. Composition Y was applied (Step B). C. Electrostatic spraying (Step A) was performed. Using an electrostatic spray device 10 having the configuration shown in Figure 1 and the appearance shown in Figure 2, when applying to a human's cheeks and forehead, electrostatic spraying was performed on the skin for 30 seconds. When applying to the eyes or nose, electrostatic spraying was performed on a cosmetic sponge for 10 to 15 seconds, and then the cosmetic sponge was placed on the skin and transferred. The conditions for the electrostatic spraying were as follows: Applied voltage: 14.5kV Distance between nozzle and skin: 100mm Discharge volume of spray composition: When electrostatically spraying directly onto the skin: 7.9mL / h 5.0mL / h when electrostatically spraying onto a sponge ·Environment: 25℃, 60%RH The electrostatic spray created a porous coating of fibrous deposits on the surface of the skin. D. A commercially available powder foundation, "Est Powder Foundation Silky Smooth," was applied. The film formed on the skin was then subjected to a sensory evaluation based on the following criteria. Three expert panelists evaluated the following: "Ease of application of foundation," "Smooth finish," "Glossy finish on cheeks," "Continued smoothness (4 hours after application)," "Continued glossy finish on cheeks (4 hours after application)," and "Suppression of shine in the T-zone (4 hours after application)." The results, calculated by the three panelists, are shown in Table 2.

[0116] 〔evaluation〕 (1) Ease of application of foundation 5: The foundation adheres very nicely. 4: Foundation adheres beautifully. 3: The foundation adheres rather nicely. 2: The foundation doesn't adhere very well. 1: The foundation doesn't adhere well. (2) Smooth finish (after applying foundation) 5: Extremely smooth finish 4: Smooth finish 3: Slightly smooth finish 2: Not a very smooth finish 1: Not a smooth finish (3) A glossy finish on the cheeks 5: Very glossy finish 4: Glossy finish 3: A slightly glossy finish 2: A matte finish 1: Matte finish (4) Smoothness lasts (4 hours after application) 5: Smoothness lasts for a long time 4: Smoothness lasts 3: Smoothness lasts for some time 2: The smoothness doesn't last very long 1: Smoothness doesn't last (5) Cheeks remain shiny (4 hours after application) 5: The shine lasts a long time 4: Long-lasting shine 3: The gloss lasts a little longer 2: The shine doesn't last very long 1: The shine doesn't last (6) Reduces shine in the T-zone (4 hours after application) 5: No shine 4: Not much shine 3: Slight shine 2: Shine is visible 1: Significant shine

[0117] [Table 1]

[0118] [Table 2] [Explanation of symbols]

[0119] 10 Electrostatic spray device 11 Low voltage power supply 12 High voltage power supply 13 Auxiliary Electrical Circuits 14 Pump mechanism 15 Container 16 nozzles 17 Conduit 18 Flexible Pipe 19 Current limiting resistor 20 Case

Claims

1. A) forming a coating on the surface of the skin by electrostatically spraying a composition X containing component (a) and component (b); (a) one or more volatile substances selected from water, alcohols, and ketones; (b) Polymer with film-forming ability B) applying to the skin a composition Y other than composition X, which contains component (c) and component (d) in amounts such that the mass ratio of component (d) to component (c) ((d) / (c)) is 0.25 or more and 2.5 or less, in this order or in the reverse order. (c) 1% by mass or more and 12% by mass or less of a water-insoluble acrylic polymer containing one or more (meth)acrylic acid alkyl esters as a monomer component, the water-insoluble polymer having a glass transition point of −20° C. or more and 25° C. or less; (d) One or more polyols having two hydroxyl groups selected from ethylene glycol, propylene glycol, 1,3-butanediol, and dipropylene glycol The component (c) is contained in the composition Y as an emulsion, Composition Y further contains (e) 0.2 mass% or less of one or more liquid oils selected from hydrocarbon oils, ester oils, and ether oils.

2. 2. The method for producing a coating according to claim 1, wherein the content of component (d) in composition Y is 0.2% by mass or more and 20% by mass or less.

3. 3. The method for producing a film according to claim 1 or 2, wherein step B) is a step of applying composition Y to the skin by a means other than electrostatic spraying.

4. The method for producing a coating according to any one of claims 1 to 3, wherein composition Y is a water-based composition.

5. The method for producing a coating according to any one of claims 1 to 4, wherein the coating formed by electrostatic spraying in step A) is a porous coating.

6. Composition Y is used to produce a coating on the skin by applying it to the skin before or after forming a coating on the skin surface by electrostatic spraying, and contains component (c) and component (d) in amounts such that the mass ratio of component (d) to component (c) ((d) / (c)) is 0.25 or more and 2.5 or less. (c) an acrylic polymer using one or more (meth)acrylic acid alkyl esters as a monomer component, in which the content of a water-insoluble polymer having a glass transition temperature of −20° C. or higher and 25° C. or lower is 1% by mass or higher and 12% by mass or lower, (d) One or more polyols having two hydroxyl groups selected from ethylene glycol, propylene glycol, 1,3-butanediol, and dipropylene glycol The component (c) is contained in the composition Y as an emulsion, Composition Y further contains (e) 0.2 mass% or less of one or more liquid oils selected from hydrocarbon oils, ester oils, and ether oils.

7. 7. Composition Y according to claim 6, wherein the composition used for electrostatic spraying is composition X containing component (a) and component (b). (a) one or more volatile substances selected from water, alcohols, and ketones; (b) Polymer with film-forming ability

8. A kit for producing a coating on the skin containing composition X and composition Y, Composition X is a composition containing component (a) and component (b) and is used to form a film on the skin surface by electrostatic spraying, (a) one or more volatile substances selected from water, alcohols, and ketones; (b) Polymer with film-forming ability The kit includes composition Y, which contains components (c) and (d) in amounts such that the mass ratio of components (d) to (c) ((d) / (c)) is 0.25 or more and 2.5 or less, and is a composition to be applied to the skin before or after the formation of a film by electrostatic spraying of composition X. (c) an acrylic polymer using one or more (meth)acrylic acid alkyl esters as a monomer component, in which the content of a water-insoluble polymer having a glass transition temperature of −20° C. or higher and 25° C. or lower is 1% by mass or higher and 12% by mass or lower, (d) One or more polyols having two hydroxyl groups selected from ethylene glycol, propylene glycol, 1,3-butanediol, and dipropylene glycol The component (c) is contained in the composition Y as an emulsion, Composition Y further contains (e) 0.2 mass% or less of one or more liquid oils selected from hydrocarbon oils, ester oils, and ether oils.

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