Natural nail primer composition, method for peeling nail from natural nail, and set comprising at least natural nail primer composition

Abstract

The present invention addresses the problem of: providing a natural nail primer composition that has excellent adhesion to a natural nail and a gel nail and that forms a primer layer that can facilitate, by bringing into contact with a liquid and applying vibration thereto, the peeling (removal) of the gel nail from the natural nail; providing a natural nail primer composition containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent; providing a method for peeling a nail from a natural nail by bringing at least a part of a nail formed by laminating, on the natural nail, a primer layer and one or more cured coating film layers, in this order, into contact with a liquid and applying vibration thereto; and providing a set comprising (i) the natural nail primer composition and at least one or more of (ii) a vibration generation device, a natural nail primer composition drying device, a nail formation material, and a nail formation material drying and curing device. As a solution, provided are: "a natural nail primer composition containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent"; "a method for peeling a nail from a natural nail by bringing at least a part of a nail formed by laminating, on the natural nail, a primer layer and one or more cured coating film layers, in this order, into contact with a liquid and applying vibration thereto, the primer layer formed from the natural nail primer composition"; and "a set comprising the natural nail primer composition, and at least one or more of a vibration generation device, a natural nail primer composition drying device, a nail formation material, and a nail formation material drying and curing device".　

Description

Nail primer composition, method for removing nail polish from nails, and set including at least the nail primer composition

[0001] The present invention relates to a nail primer composition, a method for removing nail polish from nails, and a set including at least (i) a nail primer composition and (ii) one or more of a vibration generator, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying and curing device.

[0002] Nails have been applied to enhance the aesthetic appeal of fingertips. In the past, nail polish, a synthetic resin coating applied to nails, was widely used, while in recent years, gel nails, made with thick, light-curing resins, have been widely used. Recently, nail art, which involves decorating one's own fingernails or toenails directly or by gluing artificial nails onto them, has become increasingly popular. Furthermore, artificial nails are often applied to the nails to reinforce them and prevent them from cracking or peeling. Resin-containing materials are applied to the nails to decorate and reinforce them.

[0003] Recently, gel nails, a curable composition for (artificial) nails, have been attracting attention as a material used for decorating or reinforcing nails. Gel nails are photocurable gel-type nail coating materials (curable compositions for (artificial) nails), and are known to contain, for example, a polymerizable compound such as a (meth)acrylate oligomer or a (meth)acrylic monomer, and a polymerization initiator. Gel nails are applied to nails and cured by irradiating them with ultraviolet light to form a crosslinked polymer coating through a radical polymerization reaction, thereby forming a tough coating that is resistant to peeling from the nail. Gel nails are widely known to be composed of three layers: a base coat layer applied on the nail, a color coat layer applied between the base coat and top coat layers, and a top coat layer applied on the outermost surface. When applying gel nails, it is known that a primer layer can be optionally formed on the nail.

[0004] Nail primer compositions for forming a primer layer on nails are known, as disclosed in Patent Documents 1 and 2. Patent Document 1 discloses a solution to the problem of gel nail peeling (off) from the perspective of a nail primer composition. Specifically, the nail primer composition is disclosed as a nail primer composition that provides excellent adhesion to the resulting artificial nail and excellent peelability upon removal. The nail primer composition is characterized by containing a polymeric compound having an acid group and an ethylenically unsaturated group and a weight-average molecular weight of 1,000 or more. The acid group is preferably at least one group selected from the group consisting of a carboxy group, a sulfonic acid group, a phosphate group, and a phosphonic acid group. Patent Document 2 discloses a nail primer containing a compound containing a methacryloyl group in its molecule as a nail protectant and nail protectant kit for preventing or restoring deformation of fingernails and toenails caused by disease (e.g., trauma) and external forces (e.g., strenuous exercise) or restoring them to their original shape.

[0005] JP 2017-149668 JP 7-323043

[0006] Gel nails on nails may crack, peel, or chip when subjected to impact, and may need to be removed (removed) to repair them. Furthermore, as the nail grows, the gel nail may naturally peel off after a certain period of time (approximately 10 to 30 days). Maintenance of the gel nails on the nails may be required, and at such times, the gel nail may need to be removed (removed). Furthermore, the user may need to remove the gel nails for their own convenience.

[0007] On the other hand, gel nails form a tough coating that is difficult to peel off from the nail and has strong adhesion to the nail, making it difficult to remove them from the nail. For example, the following methods (1) to (4) are known for removing gel nails from the nail. (1) A method in which the gel nail is brought into contact with a gel remover, which is an organic solvent, to soften the gel nail, and then the gel nail is peeled off or filed off by hand or with a tool. (2) A method in which the gel nail is filed and then filed off from the nail using a file or an electric remover (a router). (3) A method in which a nail remover containing an organic solvent is steamed using a steam generator, the steam is brought into contact with the gel nail to soften the gel nail, and then the gel nail is peeled off or with a tool. (4) A method in which the above (1) or (2) and (3) are combined.

[0008] Methods using organic solvents typically involve the use of organic solvents (e.g., acetone), which are volatile and flammable and may damage skin, nails, and the human body. Therefore, improvements were needed in terms of safety, working environment, odor, cost, etc. Methods that soften gel nails and then peel or scrape them off with tools, or methods that scrape gel nails off the nail with a file or electric nail remover (router), risk scraping off the surface layer of the nail at the same time, potentially making it impossible to apply gel nails while the nail is being repaired. Furthermore, there is a risk of developing symptoms such as discoloration, deformation, and nail plate peeling, so improvements were needed. Additionally, weakly adhesive nails and nails attached to the nail with double-sided tape are also known, but they tend to last a long time and require frequent replacement, so improvements were needed.

[0009] One of the problems to be solved by the present invention is to provide a nail primer composition that forms a primer layer that has excellent adhesion to nails and gel nails and that can easily remove gel nails from nails when brought into contact with a liquid and vibrated. Another problem to be solved by the present invention is to provide a nail primer composition containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent. Another problem to be solved by the present invention is to provide a method for removing a nail from a nail by contacting at least a portion of a nail formed by laminating a primer layer and one or more cured coating layers on the nail in this order with a liquid and applying vibration. Another problem to be solved by the present invention is to provide a set including at least (i) a nail primer composition and (ii) one or more of a vibration generator, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying and curing device, wherein the nail primer composition is a nail primer composition containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent.

[0010] The present inventors have conducted research to solve the above-mentioned problems, and as a result, have found that the above-mentioned problems can be solved by: (A) a nail primer composition containing cellulose nanofibers, a water-soluble polymer, and a water-soluble organic solvent; (B) a method for removing a nail from a nail by contacting at least a portion of the nail formed by laminating, on a nail, a primer layer formed from the nail primer composition containing cellulose nanofibers, a water-soluble polymer, and a water-soluble organic solvent and one or more cured coating layers in this order with a liquid and applying vibrations; and (C) a set including at least (i) a nail primer composition and (ii) one or more of a vibration generator, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying and curing device, wherein the nail primer composition contains (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent.

[0011] Specifically, the methods are as follows: [Item 1] A nail primer composition comprising (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent. [Item 2] The nail primer composition according to Item 1, wherein the water-soluble polymer comprises one or more selected from the group consisting of gelatin, polyvinyl alcohol-based resins, polyacrylic acid, water-soluble cellulose, and polyvinylpyrrolidone-based resins. [Item 3] The nail primer composition according to Item 1 or 2, wherein the water-soluble organic solvent comprises one or more selected from the group consisting of glycerin, propylene glycol, polyethylene glycol having a number-average molecular weight of 700 or less, and ethyl alcohol. [Item 4] A method for removing a nail from a nail by contacting at least a portion of a nail formed by laminating a primer layer and one or more cured coating layers in this order on the nail with a liquid and applying vibrations to the nail, wherein the primer layer is a layer formed from a nail primer composition comprising (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent. [Item 5] The method for removing nail from nail according to Item 4, wherein at least a portion of the nail on the nail is immersed in a liquid and vibration is applied. [Item 6] The method for removing nail from nail according to Item 4 or 5, wherein the vibration frequency is 0.1 kHz or higher. [Item 7] A set comprising at least (i) a nail primer composition, and (ii) one or more of a vibration generator, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying and curing device, wherein the nail primer composition is a nail primer composition containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent.

[0012] The present invention provides a nail primer composition that has excellent adhesion to nails and gel nails and forms a primer layer that allows gel nails to be easily removed from nails by contacting the composition with a liquid and applying vibrations to the composition. The present invention also provides a nail primer composition containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent. The present invention also provides a method for removing a nail from a nail by contacting at least a portion of a nail formed by laminating a primer layer and one or more cured coating layers in this order on the nail with a liquid and applying vibrations to the nail. The present invention also provides a set comprising at least (i) a nail primer composition and (ii) one or more of a vibration generator, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying and curing device, wherein the nail primer composition contains (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent.

[0013] The nail primer composition of the present invention, the method for removing nail polish from nails of the present invention, and a set comprising at least one of a vibration generator, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying and curing device can be used to remove nail polish from a formed nail without using organic solvents such as acetone, and without the need to scrape the nail off with a file or electric remover (router). This eliminates the need to remove nail polish from the nail with ease, easily, and quickly, while minimizing damage to the nail and skin. It is also believed that the flexibility of the cellulose nanofiber allows the primer layer to act as a buffer, cushioning impacts applied to the nail and thereby preventing damage such as cracking, peeling, and chipping of the nail. However, the present invention is not bound by this assumption. It is also presumed that by bringing a nail on which a primer layer and nail have been formed into contact with a liquid (particularly a liquid containing water) and vibrating the liquid, the water-soluble polymer in the primer layer absorbs the liquid and swells / dissolves in the liquid, and the cellulose nanofibers in the primer layer vibrate, allowing the liquid to penetrate into the primer layer, reducing the adhesive strength of the primer layer and making the nail more likely to peel off; however, the present invention is not bound by this presumption.

[0014] The nail primer composition of the present invention, the method for peeling nail polish from nails of the present invention, and a set including at least one of a vibration generator, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying and curing device further have the following advantages: The nail primer composition of the present invention can be applied using the same means and tools as conventional nail primer compositions, and does not require special techniques or tools. The nail primer composition of the present invention can be dried by simply applying a general-purpose hair dryer for a short period of time (e.g., about 15 seconds) to form a primer layer. The primer layer formed from the nail primer composition of the present invention exhibits excellent adhesion to both nails and nail bases and lasts for a similar period of time to conventional nail polish. Furthermore, the nail primer composition of the present invention is applicable to a wide range of nails (e.g., gel nails, peel-off nails, nail polish, etc.) because it is not limited to specific nail types. The components of the nail primer composition of the present invention are gentle on nails and skin. - When removing nail polish, no dissolution / swelling treatment using organic solvents (e.g., acetone) or machine scraping is required, making it gentle on nails, workers, and the environment. This allows for continuous nail polish removal without worrying about nail regrowth. - Nail polish removal can be safely and easily achieved by simply contacting the nail polish with liquid (immersing the liquid) and applying vibrations (e.g., at a frequency of 0.1 kHz or higher). This allows for quick changes to the next nail design, nail polish removal only available on weekends, emergency nail polish removal, and temporary nail polish removal at medical institutions. - Existing nail polish can be removed in a short time, improving the turnover rate at nail salons and other facilities. - By providing a set including at least (i) a nail primer composition and (ii) one or more of a vibration generator, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying / curing device, convenience for users and others can be enhanced.

[0015] Photographs showing the state of the nail peeling off and the condition of the nail when a method for peeling nail from a nail was carried out using the nail primer composition of Example 1 of the present invention.

[0016] The nail primer composition of the present invention, the method for removing nail polish from nails of the present invention, and a set including at least one of a vibration generator, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying and curing device are described in detail below. In the present invention, the term "nail" generally refers to a resin layer formed on a primer layer provided on a nail, and includes, for example, a gel nail.

[0017] [Nail Primer Composition] The nail primer composition of the present invention is a nail primer composition containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent. The water-soluble polymer may include one or more selected from the group consisting of gelatin, polyvinyl alcohol-based resin, polyacrylic acid, water-soluble cellulose, and polyvinylpyrrolidone-based resin. The water-soluble organic solvent may include one or more selected from the group consisting of glycerin, propylene glycol, polyethylene glycol having a number-average molecular weight of 700 or less, and ethyl alcohol.

[0018] <(a) Cellulose Nanofibers> The cellulose nanofibers (a) contained in the nail primer composition of the present invention are cellulose fine fibers obtained by defibrating a cellulose raw material and reducing the fiber diameter.

[0019] The cellulose raw material used as the raw material for cellulose nanofibers is not particularly limited as long as it contains cellulose. Examples include plants (e.g., wood, bamboo, hemp, jute, kenaf, rice husks, straw, bagasse, cotton linter, sisal, agricultural waste, cloth, pulp (softwood kraft pulp (NKP) (softwood unbleached kraft pulp (NUKP)), softwood bleached kraft pulp (NBKP), softwood unbleached sulfite pulp (NUSP) and softwood bleached sulfite pulp (NBSP)), hardwood kraft pulp (LKP) (hardwood unbleached kraft pulp (LUKP), hardwood bleached kraft pulp (LBKP)), stone ground pulp (SGP), pressed stone ground pulp, etc.). The cellulose may be one or more selected from the group consisting of: pulp (PGW), refiner ground pulp (RGP), chemi-ground pulp (CGP), thermo-ground pulp (TGP), ground pulp (GP), thermomechanical pulp (TMP), chemi-thermomechanical pulp (CTMP), bleached thermomechanical pulp (BTMP), recycled pulp, waste paper pulp, deinked pulp obtained by deinking waste paper pulp, etc.), animals (e.g., ascidians, algae, microorganisms (e.g., acetic acid bacteria (Acetobacter)), microbial products (microbial cellulose), regenerated cellulose, etc. Preferably, plant- or microbial-derived cellulose is used, and more preferably, plant-derived cellulose (such as pulp) can be used.

[0020] The cellulose raw material may be one that has been purified and bleached by a cooking treatment or the like. The cellulose raw material may be modified cellulose. Modification can be carried out by modification with a modifying agent, thermal modification, microwave modification, steam explosion modification, or the like. Examples of modifications include one or more of cationic modification, anionic modification, hydrolysis modification, esterification (acylation) modification, etherification modification, silylation modification, and the like. Modification of the cellulose raw material can be carried out using modifiers such as cationizing agents, anionic agents, etherifying agents, esterifying agents (acylation agents), silylating agents, acids, and alkalis. Furthermore, for hydrolysis modification, means such as hydrothermal decomposition, steam explosion, and microwave decomposition can be used.

[0021] The cellulose defibration method is not particularly limited. Defibration by mechanical treatment and / or defibration by chemical treatment can be used. Examples of defibration by mechanical treatment include defibration by a grinder method using a millstone-type grinder or the like; defibration by an underwater counter-impingement method in which pulp fibers are dispersed in water and then subjected to counter-impingement under high pressure; and defibration by mechanically pulverizing the cellulose by applying mechanical forces such as impact, shear, shear, and friction using one or more of a high-pressure homogenizer, an ultra-high-pressure homogenizer, a crusher, a wet or dry grinder (a high-pressure collision grinder, a ball mill, a colloid mill, a roll mill, a disk mill, etc.), a disk-type refiner, a conical refiner, a microfluidizer, a twin-screw kneader, a vibration mill, a high-speed rotary mixer, a homomixer, a high-speed shear mixer, an ultrasonic disperser, a beater, etc. Examples of defibration by chemical treatment include hydrolysis treatment using an acid, an enzyme, etc., digestion, bleaching, acid treatment, hydrolysis treatment, and regenerated cellulose.

[0022] The degree of polymerization of the cellulose nanofibers is not particularly limited. For example, it can be 100 or more, preferably 150 or more, and more preferably 300 or more, and can be 5,000 or less, preferably 3,500 or less. The degree of polymerization of the cellulose nanofibers refers to the average degree of polymerization measured according to the reduced specific viscosity method using a copper ethylenediamine solution, as described in Verification Test (3) of the "Japanese Pharmacopoeia Commentary, 15th Edition (published by Hirokawa Shoten)."

[0023] The weight-average molecular weight (Mw) of the cellulose nanofiber is not particularly limited. For example, it can be 10,000 or more, preferably 50,000 or more, and for example, 1,000,000 or less, preferably 700,000 or less. The ratio (Mw / Mn) of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of the cellulose nanofiber can be, for example, 1.5 or more, preferably 2.0 or more, and for example, 6.0 or less, preferably 5.5 or less.

[0024] The weight-average molecular weight (Mw) and the ratio (Mw / Mn) of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of the cellulose nanofibers can be controlled by selecting the cellulose raw material and subjecting the cellulose raw material to physical treatment (defibration treatment) and / or chemical treatment. The weight-average molecular weight and number-average molecular weight of the cellulose nanofibers can be obtained by dissolving the cellulose nanofibers in N,N-dimethylacetamide containing lithium chloride and performing gel permeation chromatography using N,N-dimethylacetamide as a solvent.

[0025] The number average fiber diameter of cellulose nanofibers is usually 0.1 nm or more and less than 1,000 nm. For example, it can be 0.5 nm or more, preferably 1.0 nm or more, more preferably 3.0 nm or more, and even more preferably 5.0 nm or more, and can be 300 nm or less, preferably 200 nm or less, more preferably 100 nm or less, and even more preferably 50 nm or less.

[0026] The ratio L / D (average aspect ratio) of the number average fiber length (L) to the number average fiber diameter (D) of the cellulose nanofibers is not particularly limited and can be, for example, 10 or more, preferably 20 or more, preferably 30 or more, preferably 50 or more, and more preferably 100 or more, and can be, for example, 5,000 or less, preferably 3,000 or less, and more preferably 1,000 or less.

[0027] The number-average fiber length (L), number-average fiber diameter (D), and L / D (average aspect ratio) of cellulose nanofibers are determined by dispersing an aqueous dispersion of cellulose nanofibers using a high-shear homogenizer at 15,000 rpm for 5 minutes, diluting the resulting aqueous dispersion with pure water to 0.1 to 0.5 mass%, casting it on mica, and air-drying it to obtain a measurement sample, and measuring it with a scanning electron microscope (SEM) or atomic force microscope (AFM). Specifically, the fiber length and fiber diameter of 100 randomly selected cellulose nanofibers are measured in an observation field with a magnification adjusted so that at least 100 cellulose nanofibers are observed, and the number-average fiber length (L), number-average fiber diameter (D), and L / D (average aspect ratio) of the cellulose nanofibers can be calculated.

[0028] The nail primer composition of the present invention preferably contains anion-modified cellulose nanofibers as the cellulose nanofibers. Anion-modified cellulose is cellulose that has anionic groups such as carboxymethyl groups, carboxyl groups, phosphate ester groups, and sulfate ester groups introduced into the cellulose that constitutes the cellulose nanofibers. For example, one or more selected from the group consisting of carboxymethylated cellulose nanofibers, carboxylated cellulose nanofibers, phosphate-modified cellulose nanofibers, phosphite-modified cellulose nanofibers, and sulfate ester cellulose nanofibers can be used. Among these, carboxymethylated cellulose nanofibers and carboxylated cellulose nanofibers are preferred, and carboxymethylated cellulose nanofibers are more preferred.

[0029] Anionically modified cellulose nanofibers can be obtained by anionically modifying a cellulose raw material that serves as the raw material for the cellulose nanofibers to form anionically modified cellulose, and then defibrating the cellulose. Alternatively, the cellulose raw material can be defibrated and then anionically modified. In the present invention, it is preferable to use anionically modified cellulose as the cellulose raw material and then use anionically modified cellulose nanofibers obtained by defibrating the cellulose.

[0030] As the anion-modified cellulose used as the raw material for anion-modified cellulose nanofibers, it is preferable to use anion-modified cellulose that allows observation of cellulose type I crystal peaks when measured by X-ray diffraction. The anion-modified cellulose preferably contains 50% or more cellulose type I crystals. The crystallinity of cellulose type I in the anion-modified cellulose nanofibers is preferably 50% or more and 90% or less. The crystallinity of cellulose can be controlled by the crystallinity of the raw cellulose and the degree of anion modification. The crystallinity of anion-modified cellulose and anion-modified cellulose nanofibers can be measured by placing a sample in a glass cell and measuring using an X-ray diffraction measurement device.

[0031] Examples of anion-modified cellulose nanofibers that can be used include commercially available products such as the CELLENPIA series (carboxymethylated cellulose nanofibers, carboxylated cellulose nanofibers) manufactured by Nippon Paper Industries Co., Ltd., RHEOCRYSTA Cellulose Nanofiber Gel (carboxylated cellulose nanofibers) manufactured by Daiichi Kogyo Seiyaku Co., Ltd., and Aurovisco (phosphate-esterified cellulose nanofibers) manufactured by Oji Paper Co., Ltd.

[0032] When preparing the nail primer composition, the cellulose nanofibers can be used in the form of a cellulose nanofiber dispersion, preferably an aqueous cellulose nanofiber dispersion, from the standpoint of ease of handling. The cellulose nanofiber dispersion can be obtained, for example, by dispersing a cellulose raw material in a solvent and defibrating the cellulose nanofibers while dispersed in the solvent. Alternatively, the cellulose nanofiber dispersion can be obtained by dispersing the defibrated cellulose nanofibers in a liquid. The solvent constituting the cellulose nanofiber dispersion is not particularly limited. Examples include one or more of water, water-soluble organic solvents, and water-insoluble organic solvents. The cellulose nanofiber dispersion may contain one or more dispersants and surfactants as needed. The solids concentration of the cellulose nanofiber dispersion is not particularly limited. For example, the solids concentration can be 0.5% by mass or more, preferably 1.0% by mass or more, and 20.0% by mass or less, preferably 10.0% by mass or less.

[0033] The content of cellulose nanofibers can be adjusted appropriately depending on the content, viscosity, coatability, etc. of each component in the nail primer composition. Taking the total amount of the nail primer composition as 100% by mass, the content can be, for example, 15.0% by mass or less, preferably 10.0% by mass or less, more preferably 8.0% by mass or less, or greater than 0% by mass, preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more. If the content of cellulose nanofibers exceeds 15.0% by mass, the viscosity of the nail primer composition may increase, making it difficult to form a primer layer. If the content of cellulose nanofibers is 0% by mass (possibly less than 0.1% by mass), it may be difficult to form a uniform primer layer from the nail primer composition, making it difficult to smoothly remove gel nails.

[0034] Furthermore, the content of cellulose nanofibers can be, for example, 40.0% by mass or more, preferably 45.0% by mass or more, and more preferably 55.0% by mass or more, relative to 100% by mass of the dried coating film of the nail primer composition, and can be, for example, 85.0% by mass or less, preferably 80.0% by mass or less, and more preferably 75.0% by mass or less.

[0035] <(b) Water-Soluble Polymer> The water-soluble polymer (b) contained in the nail primer composition of the present invention has a solubility in water at 25°C of greater than 0.01 g / ml. For example, one or more selected from the group consisting of water-soluble (meth)acrylic resins, water-soluble maleic acid resins, water-soluble styrene-(meth)acrylic resins, water-soluble styrene-maleic acid resins, polyvinylpyrrolidone resins, polyvinyl alcohol resins, water-soluble urethane resins, water-soluble cellulose resins, water-soluble polysaccharides, and water-soluble natural polymers can be used. The weight-average molecular weight of the water-soluble polymer is not particularly limited. It can be, for example, 800 or more, preferably 1,000 or more, and for example, 100,000 or less, preferably 50,000 or less.

[0036] Examples of the water-soluble polymer include sodium polyacrylate, polyacrylic acid, polyvinyl alcohol (saponification degree 80 mol% or more), polyvinylpyrrolidone, polyalkylene oxides (polyethylene oxide, polypropylene oxide, etc.), dextrin, sodium alginate, potassium alginate, mannan, xylan, xyloglucan, gum arabic, tamarind gum, pectin, pullulan, casein, xanthan gum, carrageenan, guar gum, sodium chondroitin sulfate, sodium hyaluronate, tragacanth gum, gelatin, carboxyalkyl celluloses (carboxymethyl cellulose, carboxyethyl cellulose, sodium carboxymethyl cellulose, etc.), hydroxyalkyl celluloses (hydroxyethyl cellulose, hydroxypropyl cellulose, etc.), hydroxydialkyl celluloses (hydroxypropyl methyl cellulose, etc.), alkyl celluloses (methyl cellulose, ethyl cellulose, propyl cellulose, butyl cellulose, etc.), alkyl cellulose alkyl ethers, and the like. At least one selected from the group consisting of these can be used.

[0037] Among these water-soluble polymers, it is preferable to use one or more selected from the group consisting of water-soluble (meth)acrylic resins, polyvinylpyrrolidone resins, polyvinyl alcohol resins, water-soluble cellulose resins, water-soluble polysaccharides, and water-soluble natural polymers. More preferably, it is one or more selected from the group consisting of sodium polyacrylate, polyacrylic acid, polyvinyl alcohol (saponification degree 80 mol% or more), polyvinylpyrrolidone, polyethylene oxide, polypropylene oxide, dextrin, sodium alginate, potassium alginate, mannan, gum arabic, pectin, pullulan, xanthan gum, carrageenan, gelatin, carboxymethyl cellulose, carboxyethyl cellulose, sodium carboxymethyl cellulose, and hydroxyethyl cellulose. Even more preferably, it is one or more selected from the group consisting of sodium polyacrylate, polyacrylic acid, polyvinyl alcohol (saponification degree 80 mol% or more), polyvinylpyrrolidone, polyethylene oxide, gelatin, and sodium carboxymethyl cellulose.

[0038] In the nail primer composition of the present invention, it is particularly preferable to use, as the water-soluble polymer, one or more selected from the group consisting of gelatin, polyvinyl alcohol-based resins, polyacrylic acid, water-soluble cellulose, and polyvinylpyrrolidone-based resins.

[0039] In the nail primer composition of the present invention, a water-soluble polymer is dissolved in water to prepare an aqueous solution having a concentration of, for example, 0.05% by mass or more, preferably 0.1% by mass or more, and for example, 20% by mass or less, preferably 10% by mass or less, and the nail primer composition can be prepared using this. In the nail primer composition of the present invention, a water-soluble polymer is dissolved or dispersed in an organic solvent to prepare a solution or dispersion having a concentration or content of, for example, 0.05% by mass or more, preferably 0.1% by mass or more, and for example, 20% by mass or less, preferably 10% by mass or less, and the nail primer composition can be prepared using this.

[0040] The content of the water-soluble polymer can be appropriately adjusted depending on the content, viscosity, coatability, etc. of each component in the nail primer composition. The total amount of the nail primer composition is taken as 100% by mass, and the content can be, for example, 30.0% by mass or less, preferably 15.0% by mass or less, more preferably 8.0% by mass or less, or can be greater than 0% by mass, preferably 0.05% by mass or more, more preferably 0.2% by mass or more. If the content of the water-soluble polymer exceeds 30.0% by mass, the viscosity of the nail primer composition may increase, making it difficult to form a primer layer. If the content of the water-soluble polymer is 0% by mass (possibly less than 0.05% by mass), the components of the nail primer composition may not be uniform, and it may be difficult to form a primer layer.

[0041] Furthermore, the content of the water-soluble polymer can be, for example, 10.0 mass% or more, preferably 12.0 mass% or more, and more preferably 15.0 mass% or more, relative to 100 mass% of the dried coating film of the nail primer composition, and can be, for example, 45.0 mass% or less, preferably 35.0 mass% or less, and more preferably 25.0 mass% or less.

[0042] <(c) Water-Soluble Organic Solvent> The (c) water-soluble organic solvent contained in the nail primer composition of the present invention is an organic solvent that has a solubility in water at 25° C. of 1 g / L or more, preferably 10 g / L or more, more preferably 100 g / L or more, and most preferably is uniformly miscible in any proportion. For example, one or more organic solvents selected from the group consisting of monoalcohols, polyhydric alcohols, alkyl ethers of polyhydric alcohols, ketones, ethers, esters, nitrogen-containing compounds, etc. can be used.

[0043] As the monoalcohol, for example, one or more selected from the group consisting of methyl alcohol, ethyl alcohol, n-propanol, n-butanol, n-pentanol, n-hexanol, n-heptanol, n-octanol, cyclopentanol, cyclohexanol, etc. can be used.

[0044] Examples of polyhydric alcohols include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,2-pentanediol, 1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,2-heptanediol, 2,2-dimethyl-1,3-propanediol, 2-methyl-1,3-propanediol, 2-ethyl-2-methyl-1,3-propanediol, 3-methyl-1,3-butanediol, 3-methyl-1,5-pentanediol, 2-methyl- One or more selected from the group consisting of 2-propyl-1,3-propanediol, 2-ethyl-1,3-hexanediol, 1,2-octanediol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, dibutylene glycol, polyethylene glycol having a number average molecular weight of 700 or less, polypropylene glycol having a number average molecular weight of 700 or less, glycerin, diglycerin, triglycerin, pentaerythritol, trimethylolpropane, and the like can be used.

[0045] Examples of alkyl ethers of polyhydric alcohols include ethylene glycol monomethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monoisobutyl ether, diethylene glycol monomethyl ether, propylene glycol monomethyl ether, propylene glycol monopropyl ether, dipropylene glycol monomethyl ether, diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol diethyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monopentyl ether, diethylene glycol monohexyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, and triethylene glycol monopropyl ether. and glycol dialkyl ethers such as ethylene glycol monobutyl ether, triethylene glycol monomethyl ether, tetraethylene glycol monoethyl ether, tetraethylene glycol monobutyl ether, dipropylene glycol monopropyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monoethyl ether, diethylene glycol butyl methyl ether, triethylene glycol dimethyl ether, triethylene glycol methyl ethyl ether, triethylene glycol butyl methyl ether, triethylene glycol diethyl ether, tetraethylene glycol dimethyl ether, tetraethylene glycol methyl ethyl ether, tetraethylene glycol butyl methyl ether, and tetraethylene glycol diethyl ether.

[0046] As the ester, for example, one or more selected from the group consisting of γ-butyrolactone, γ-valerolactone, δ-valerolactone, ε-caprolactone, etc. can be used.

[0047] Examples of nitrogen-containing solvents include 2-pyrrolidone, N-methylpyrrolidone, N-ethylpyrrolidone, ε-caprolactam, 3-methyl-2-oxazolidinone, 3-ethyl-2-oxazolidinone, N,N-dimethyl-β-methoxypropionamide, N,N-dimethyl-β-ethoxypropionamide, N,N-dimethyl-β-butoxypropionamide, N,N-dimethyl-β-pentoxypropionamide, N,N-dimethyl-β-hexoxypropionamide, and N,N-dimethyl One or more compounds selected from the group consisting of N,N-dimethyl-β-2-ethylhexoxypropionamide, N,N-dimethyl-β-octoxypropionamide, N,N-diethyl-β-butoxypropionamide, N,N-diethyl-β-pentoxypropionamide, N,N-diethyl-β-hexoxypropionamide, N,N-diethyl-β-heptoxypropionamide, and N,N-diethyl-β-octoxypropionamide can be used.

[0048] Among these water-soluble organic solvents, it is preferable to use one or more selected from the group consisting of monoalcohols, polyhydric alcohols, alkyl ethers of polyhydric alcohols, and ethers, more preferably ethyl alcohol, n-propanol, n-butanol, n-hexanol, n-octanol, cyclopentanol, cyclohexanol, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, dibutylene glycol, polyethylene glycols having a number-average molecular weight of 700 or less, polypropylene glycols having a number-average molecular weight of 700 or less, glycerin, diglycerin, triglycerin, and pentaerythritol, and even more preferably ethyl alcohol, ethylene glycol, propylene glycol, diethylene glycol, polyethylene glycols having a number-average molecular weight of 700 or less, and glycerin.

[0049] In the nail primer composition of the present invention, it is particularly preferable to use, as the water-soluble organic solvent, one or more selected from the group consisting of glycerin, propylene glycol, polyethylene glycol, and ethyl alcohol.

[0050] The content of the water-soluble organic solvent can be appropriately adjusted depending on the content, viscosity, coatability, etc. of each component in the nail primer composition. The content can be, for example, 20.0% by mass or less, preferably 10.0% by mass or less, more preferably 5.0% by mass or less, based on the total amount of the nail primer composition being 100% by mass. It can also be greater than 0% by mass, preferably 0.01% by mass or more, more preferably 0.05% by mass or more. If the content of the water-soluble polymer exceeds 20.0% by mass, the amount of the active ingredient in the nail primer composition decreases, which may make it difficult to form a primer layer. If the content of the water-soluble polymer is 0% by mass (possibly less than 0.01% by mass), the nail primer composition may dry too quickly, resulting in poor storage stability.

[0051] <(d) Water> The nail primer composition of the present invention can contain water in addition to the components (a) to (c). Examples of water that can be used include tap water, purified water, distilled water, ion-exchanged water, and pure water. Preferably, purified water, pure water, ion-exchanged water, or distilled water can be used.

[0052] The water content can be adjusted appropriately depending on the content, viscosity, etc. of each component in the nail primer composition. Taking the total amount of the nail primer composition as 100% by mass, the water content can be, for example, 99.0% by mass or less, preferably 98.0% by mass or less, or 0% by mass or more, preferably 30.0% by mass or more, and more preferably 50.0% by mass or more. If the water content exceeds 99.0% by mass, the amount of active ingredients in the nail primer composition will be reduced, which may make it difficult to form a primer layer.

[0053] <Other Components> The nail primer composition of the present invention may contain various components as "other components" in addition to the components (a) to (d) above, to the extent that they do not adversely affect drying properties, nail retention, vibration peeling properties, storage stability, gel nail formability, gel nail design properties, primer coating film adhesion, viscosity, handleability, coatability, etc. Examples of other components include one or more selected from the group consisting of preservatives, colorants, surfactants, resins other than the components (a) and (b), solvents other than the components (c) and (d), fragrances, fillers, antifoaming agents, antioxidants, leveling agents, wetting improvers, decorative materials, antibacterial agents, etc.

[0054] (Preservatives) The preservative that may be contained in the nail primer composition of the present invention is not particularly limited as long as it is a component that can exhibit the function of preventing spoilage (microbial growth) of the nail primer composition. Examples of preservatives include acids such as benzoic acid, benzoates, salicylic acid, salicylates, dehydroacetic acid, dehydroacetates, sorbic acid, and sorbates; phenols such as phenoxyethanol, hinokitiol, hydroxybenzoxathiol, and parahydroxybenzoic acid esters (parabens); halogenated bisphenols such as hexachlorophene and 2,4,4'-trichloro-2'-hydroxydiphenyl ether (triclosan); and amides such as 3,4,4'-trichlorocarbanilide and 3-trifluoromethyl-4,4'-dichlorocarbanilide (halocarban). One or more compounds selected from the group consisting of chlorhexidine gluconate, chlorhexidine hydrochloride, tetramethylthiuram disulfide (thiram), photosensitizer 201, photosensitizer 101, 1-hydroxypyridine-2-thione (zinc pyrithione), imidazoyl urea compounds (imidazolidinyl urea), N-trichloromethyl mercapto-4-cyclohexene-2-dicarboximide, lysozyme chloride, chlorphenesin, chlorobutanol, 2-bromo-2-nitro-1,3-propanediol, 6-acetoxy-2,4-dimethyl-m-dioxane, and the like can be used.

[0055] The content of the preservative is not particularly limited. The content of the preservative can be, for example, 0% by mass or more, preferably 0.001% by mass or more, more preferably 0.007% by mass or more, relative to the total amount of the nail primer composition, and 1% by mass or less, preferably 0.5% by mass or less, more preferably 0.07% by mass or less. If the content of the preservative is less than 0.001% by mass relative to the total amount of the nail primer composition, problems may arise in terms of preservative ability, and if it exceeds 1% by mass, the content will exceed the standard for addition to cosmetics.

[0056] (Colorant) The colorant that may be contained in the nail primer composition of the present invention is not particularly limited as long as it is a component that can impart any desired color tone to the nail primer composition. For example, one or more colorants selected from the group consisting of inorganic color pigments, organic color pigments, luster pigments, fluorescent pigments, colored resin particles, dyes, etc. can be used. The colorant can be in the form of particles or dispersions, and two or more colorants can be mixed to achieve a desired color tone. When particles such as pigments or colored resin particles are used as colorants, they can be unsurface-treated or surface-treated with a surface treatment agent such as a silane coupling agent, resin, or pigment derivative.

[0057] Examples of the color pigment include inorganic color pigments and / or organic color pigments that can impart various color tones such as red, blue, yellow, green, purple, black, white, orange, and brown to the nail primer composition, and two or more inorganic color pigments and / or organic color pigments may be mixed and used to obtain a desired color tone.

[0058] As the inorganic color pigment, for example, one or more selected from the group consisting of titanium oxide, red iron oxide, ultramarine, carbon black, iron black, zinc oxide, zinc yellow, iron yellow, iron blue, chromium oxide green, manganese violet, carbon black, cobalt green, etc. can be used.

[0059] Examples of organic coloring pigments that can be used include azo pigments, azomethine pigments, aniline black, anthrapyrimidine pigments, anthraquinone pigments, isoindolinone pigments, isoindoline pigments, indigo pigments, indoreline pigments, quinacridone pigments, quinophthalone pigments, metal complex pigments, dioxazine pigments, dioxane pigments, diketopyrrolopyrrole pigments, threne pigments, polycyclic pigments, thioindigo pigments, nitro pigments, nitroso pigments, phthalocyanine pigments, perinone pigments, perylene pigments, and benzimidazolone pigments.

[0060] Examples of the luster pigment include metal powders and metal foils such as gold, silver, copper, chromium, titanium, nickel, aluminum, brass, and stainless steel; flake pigments such as mica, synthetic mica, silica flakes, aluminum flakes, aluminum oxide flakes, iron oxide flakes, metal oxide flakes, and glass flakes; coated pigments in which these flake pigments (thin flaky substrates) are coated with one or more thin layers of one or more types of materials such as titanium oxide, iron oxide, silica, tin oxide, zirconium oxide, chromium oxide, aluminum oxide, gold, silver, nickel, chromium, titanium, aluminum, magnesium fluoride, and titanium nitride; pearlescent pigments such as fish scale foil and bismuth oxychloride; light-reflecting pigments; and light-interference pigments.

[0061] The dye may be one or more selected from the group consisting of water-soluble dyes or disperse dyes of various colors such as red, blue, yellow, green, purple, black, white, orange, brown, etc. The dye may be one or more selected from the group consisting of acid dyes, direct dyes, basic dyes, reactive dyes, and food dyes.

[0062] The fluorescent pigment may be one or more pigments that use light of a specific wavelength in the ultraviolet, visible, or infrared region as excitation energy and emit light in a wavelength region different from the wavelength. The colored resin particles are fine particles of a mixture of one or more of the colored pigments, luster pigments, fluorescent pigments, dyes, etc., with a resin, and the resin may be one or more of colored resin pigments such as polyolefin resins, polystyrene resins, acrylic resins, polyester resins, polyurethane resins, etc.

[0063] (Surfactant) The surfactant that may be contained in the nail primer composition of the present invention is not particularly limited as long as it is a component that can function as a surfactant and / or dispersant in the nail primer composition.

[0064] The surfactant may be, for example, one or more selected from the group consisting of nonionic surfactants such as glycerin fatty acid esters, propylene glycol fatty acid esters, fatty acid sorbitan, sucrose fatty acid esters, fatty acid mono(di)ethanolamides, fatty acid polyethylene glycols, polyethylene alkyl ethers, fatty acid polyoxyethylene sorbit, and polyoxyethylene hydrogenated castor oil; anionic surfactants such as fatty acid metal salts, alkyl sulfates (e.g., sodium lauryl sulfate), alkyl ether sulfates (e.g., polyoxyethylene lauryl ether sodium sulfate), alkyl phosphates, and alkyl ether phosphates (e.g., polyoxyethylene oleyl ether sodium phosphate); cationic surfactants such as alkyltrialkylammonium chloride salts (e.g., stearyltrimethylammonium chloride, distearyldimethylammonium chloride), and alkyltrimethylammonium bromide salts; and amphoteric surfactants such as sodium β-laurylaminopropionate and lauryldimethylaminoacetic acid betaine.

[0065] (Resins Other Than (a) and (b)) The resins other than (a) and (b) that may be contained in the nail primer composition of the present invention are not particularly limited as long as they function as thickeners or adhesion improvers in the nail primer composition and fix a primer layer on the nail after the solvent evaporates after application. Examples of resins other than (a) and (b) include one or more selected from the group consisting of polyurethane resins, polyester resins, polyamide resins, polyether resins, olefin resins, aromatic olefin resins, aromatic hydrocarbon resins, acrylic resins, vinyl chloride resins, vinyl acetate resins, polyvinyl alcohol resins, polyvinyl acetal resins, core-shell polymers, graft resins, block resins, and polymer polyols. The weight-average molecular weight of the resins other than (a) and (b) is not particularly limited. For example, a weight-average molecular weight of 100 to 100,000 is preferred.

[0066] (Solvents Other Than (c) and (d)) The solvents other than (c) and (d) that may be contained in the nail primer composition of the present invention are not particularly limited as long as they can function as a diluent in the nail primer composition and can adjust the viscosity at the time of application by dilution. Examples of the solvents other than (c) and (d) that can be used include one or more selected from the group consisting of ketones such as acetone, methyl isobutyl ketone, methyl ethyl ketone, and cyclohexanone; aromatic hydrocarbons such as toluene and xylene; acetate esters such as methyl acetate, ethyl acetate, and butyl acetate; and diacetone alcohol.

[0067] <Uses of Nail Primer Composition> The nail primer composition of the present invention is applied directly to nails or onto a coating film on the nails, and is used to form a primer layer on which a gel nail is formed. In the present invention, the time until the gel nail is removed (peeled off) can be adjusted by adjusting the area of ​​the primer layer formed directly on the nails or on a coating film on the nails. The nail primer composition of the present invention can be used to form a primer layer that has excellent adhesion to nails and gel nails and that can be easily removed (peeled off) from the nail by contacting it with a liquid and applying vibrations. The frequency of the applied vibration is not particularly limited. It can be, for example, 0.1 kHz or higher, preferably 0.12 kHz or higher, and more preferably 0.15 kHz or higher, and can be, for example, 50 kHz or lower, preferably 45 kHz or lower, and more preferably 40 kHz or lower.

[0068] [Method for Peeling Nail from Nail] The method for peeling nail from nail of the present invention comprises contacting at least a portion of a nail formed by laminating a primer layer and one or more cured coating film layers in this order on the nail with a liquid and applying vibrations to the nail, thereby peeling the nail from the nail, wherein the primer layer is a layer formed from a nail primer composition containing: (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent.

[0069] As the nail primer composition for forming the primer layer provided on the nail, the nail primer composition described above in [Nail Primer Composition] is used.

[0070] A gel nail formed by laminating a cured coating film layer on a primer layer can be formed, for example, using a curable composition for (artificial) nails (a curable composition for artificial nails and / or a curable composition for nails). As the curable artificial nail composition for (artificial) nails, for example, one containing (a) a polymerizable compound and (b) a polymerization initiator as essential components, and containing (c) a colorant, (d) a chain transfer agent, (e) a polymerization inhibitor, etc. can be used.

[0071] The (a) polymerizable compound preferably includes a (meth)acryloyl group-containing polymerizable compound. The (meth)acryloyl group-containing polymerizable compound is a compound that has one or more (meth)acryloyl groups in the molecule and can be cured by irradiation with energy rays such as light. The polymerizable compound preferably includes a (meth)acrylate oligomer and / or a (meth)acrylate monomer as the (meth)acryloyl group-containing polymerizable compound.

[0072] The (meth)acrylate oligomer is an oligomer having one or more (meth)acryloyl groups and a plurality of repeating units in the molecule. The number of (meth)acryloyl groups contained in one molecule is 1 to 10, preferably 2 to 8, and the weight average molecular weight can be, for example, 1,000 to 100,000. The (meth)acrylate oligomer can be, for example, one or more selected from the group consisting of urethane (meth)acrylate oligomers, epoxy (meth)acrylate oligomers, ester (meth)acrylate oligomers, and ether (meth)acrylate oligomers. The (meth)acrylate monomer is a compound other than the (meth)acrylate oligomers, having one or more (meth)acryloyl groups in the molecule, and having 1 to 10, preferably 1 to 8 (meth)acryloyl groups in one molecule.

[0073] The (b) polymerization initiator is not particularly limited as long as it generates radicals when energy is imparted thereto by irradiation with light (e.g., ultraviolet light) or heat, and is capable of initiating polymerization of the (a) polymerizable compound. Examples include one or more polymerization initiators selected from the group consisting of acylphosphine oxides, α-hydroxyalkylphenones, benzoin ethers, benzil ketals, acid esters, α-aminoalkylphenones, benzophenones, thioxanthones, titanocenes, quinones, peroxides, azo compounds, and persulfates. For example, when irradiating the composition with ultraviolet light having a wavelength of 365 to 405 nm emitted from a UV-LED light source during curing, it is preferable to use a polymerization initiator containing an acylphosphine oxide polymerization initiator.

[0074] The (c) colorant can impart a desired color tone to the (artificial) nail curable composition, and can be, for example, one or more selected from the group consisting of pigments, luster pigments, and dyes. The (d) chain transfer agent can be, for example, a multifunctional thiol compound having two or more thiol groups in the molecule. The chain transfer agent can also function as a curability regulator, crosslinking agent, and viscosity modifier. The (e) polymerization inhibitor can be, for example, one or more selected from the group consisting of tocopherol compounds, quinone compounds, phenol compounds, catechol compounds, oxydiphenylamine compounds, nitroso compounds, nitrone compounds, nitrile compounds, hydrazyl compounds, phenothiazine compounds, etc. In addition to the components (a) to (e), the curable composition for (artificial) nails may contain one or more additives selected from the group consisting of various additives such as resins, polyol compounds, solvents, fragrances, anti-settling agents, antifoaming agents, silane coupling agents, polymerization accelerators, surface tension modifiers, flame retardants, antioxidants, ion adsorbents, stress reducers, preservatives, antibacterial agents, flexibility imparting agents, waxes, halogen trapping agents, leveling agents, wetting improvers, and decorative materials.

[0075] The viscosity of the (artificial) nail curable composition at 25°C can be, for example, 0.1 Pa·s or more and 60.0 Pa·s or less. By setting the viscosity within this range, application can be easily performed using an applicator such as a brush or inkjet printer. The (artificial) nail curable composition can be applied to a primer layer of the nail primer composition formed on the fingernails and / or toenails of a person, or the nails of an animal such as a dog or cat, to form a nail. The application method is not particularly limited, and for example, an applicator such as a brush or an application method such as an inkjet printer can be used.

[0076] The means for curing the curable composition for (artificial) nails after application to form a nail is not particularly limited as long as it is a means capable of imparting energy for curing. Examples include irradiation with energy rays such as light (ultraviolet rays (UV)), electron beams, and heat. Curing by irradiation with ultraviolet rays (UV) is particularly preferred. As the irradiation source for energy rays, for example, known ultraviolet light sources such as mercury lamps, metal halide lamps, ultraviolet light-emitting diodes (UV-LEDs), and ultraviolet laser diodes (UV-LDs) can be used, and among these, ultraviolet light-emitting diodes and ultraviolet laser diodes (UV-LDs) are preferred.

[0077] In the method of the present invention for removing nails from nails, the liquid that is brought into contact with the nail formed by laminating a primer layer and one or more cured coating layers in this order on the nail is preferably a liquid that is less irritating and less harmful to the nail and skin. For example, a liquid containing water and / or an organic solvent can be used. The organic solvent can be a liquid containing the water-soluble organic solvent that constitutes the nail primer composition. In the method of the present invention for removing nails from nails, a liquid containing water is preferably used. The means for bringing the liquid into contact with the nail can be, for example, one or more of immersion in the liquid, spraying the liquid, dripping the liquid, and flowing the liquid. Immersion in the liquid is particularly preferred.

[0078] In the method for peeling nail polish from a nail according to the present invention, the frequency of the vibration applied is not particularly limited. For example, it can be 0.1 kHz or higher, preferably 0.12 kHz or higher, more preferably 0.15 kHz or higher, and can be 50 kHz or lower, preferably 45 kHz or lower, more preferably 40 kHz or lower. The vibration is preferably applied by bringing the nail into contact with a liquid, preferably by immersing the nail in the liquid and then applying vibration to the liquid, or by immersing the nail in the liquid to which vibration has been applied. The vibration generator used to apply the vibration may be one equipped with a motor and a vibrator driven by the motor, one equipped with a piezoelectric element, one equipped with a coil, or the like.

[0079] The method of the present invention for removing nail polish from a nail can remove (come off) nail polish from the nail simply by contacting the nail with a liquid and applying vibrations, and can be completed in a short time without damaging the nail or skin.

[0080] [Set] The set of the present invention includes at least (i) a nail primer composition and (ii) one or more of a vibration generator, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying and curing device, wherein the nail primer composition is a nail primer composition containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent.

[0081] As the nail primer composition in the set, the nail primer composition described above in [Nail Primer Composition] is used.

[0082] The vibration generator in the set is not particularly limited as long as it is a device equipped with a vibration generating mechanism that generates vibrations. The frequency of vibrations generated by the vibration generator is not particularly limited, but can be, for example, 0.1 kHz or higher, preferably 0.12 kHz or higher, more preferably 0.15 kHz or higher, and can be, for example, 50 kHz or lower, preferably 45 kHz or lower, more preferably 40 kHz or lower. The vibration generator is preferably capable of imparting vibrations to a liquid in contact with the nail. Examples of the vibration generator that can be used include one equipped with a motor and a vibrating body driven by the motor, one equipped with a piezoelectric body, and one equipped with a coil.

[0083] The nail primer composition drying device in the set is not particularly limited as long as it can remove solvent, particularly water, from the coating film (primer layer) formed from the nail primer composition. For example, one or more drying devices such as a hot air and / or cold air blower (dryer), a dryer, an oven, and an infrared irradiation device can be used.

[0084] The nail-forming material in the set is not particularly limited. For example, one or more of the gel nail coating materials (curable compositions for (artificial) nails) described in the above section "Method for Peeling Nail from Nail" can be used.

[0085] The nail-forming material drying / curing device in the set is not particularly limited as long as it is capable of drying and / or curing the nail-forming material. For example, a device similar to the nail primer drying device described above can be used. Furthermore, when the nail-forming material is a gel nail coating material (curable composition for (artificial) nails), a device capable of applying energy to cause curing can be used. For example, an energy ray irradiator such as light (ultraviolet (UV)), electron beam, or heat can be used. In particular, an ultraviolet (UV) irradiator is preferably used. The irradiation source of the energy ray irradiator can be, for example, one or more of a mercury lamp, a metal halide lamp, an ultraviolet light-emitting diode (UV-LED), an ultraviolet laser diode (UV-LD), etc., and among these, an ultraviolet light-emitting diode and an ultraviolet laser diode (UV-LD) are preferred.

[0086] Examples of sets include sets including the following: <1> Nail primer composition and a vibration generator. <2> Nail primer composition and a nail primer composition drying device. <3> Nail primer composition and a nail-forming material. <4> Nail primer composition, a vibration generator, and a nail primer composition drying device. <5> Nail primer composition, a vibration generator, and a nail-forming material. <6> Nail primer composition, a nail primer composition drying device, and a nail-forming material. <7> Nail primer composition, a nail-forming material, and a nail-forming material drying and curing device. <8> Nail primer composition, a vibration generator, a nail primer composition drying device, and a nail-forming material. <9> Nail primer composition, a vibration generator, a nail-forming material, and a nail-forming material drying and curing device. <10> Nail primer composition, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying and curing device. <11> Nail primer composition, a vibration generator, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying and curing device.

[0087] The set of the present invention, which includes at least a nail primer composition and a vibration generator, can be suitably used in the invention related to the "Method for Removing Nail Polish from a Nail." Therefore, it is preferable that the set includes a container for storing liquid so that at least a portion of the nail on the nail is brought into contact with the liquid, preferably immersed in the liquid. The liquid used in this case can be the same liquid that is brought into contact with the nail in the "Method for Removing Nail Polish from a Nail." The set of the present invention, which includes at least a nail primer composition and a vibration generator, can easily implement the invention related to the "Method for Removing Nail Polish from a Nail" even in existing nail salons, etc.

[0088] The set of the present invention, which includes a nail primer composition, a vibration generator, and a nail-forming material, allows users to easily form gel nails and easily remove the gel nails by simply preparing the set.

[0089] The present invention will be described in more detail with reference to examples and comparative examples. The following examples illustrate one embodiment of the present invention. The present invention is not limited to the following examples. In the examples and comparative examples, "%" means "% by mass" and "parts" means "parts by mass" unless otherwise specified.

[0090] [Examples 1 to 6, Comparative Examples 1 and 2] The components shown in Table 1 were charged into a stainless steel mixer in the quantitative ratios (parts by mass) shown in Table 1, and stirred at 25°C under atmospheric pressure at 1 atmosphere. Cellulose nanofiber (hereinafter sometimes referred to as "CNF") was dispersed in water in advance to prepare an aqueous dispersion, and this aqueous dispersion was charged into the mixer so that the amount of CNF was in the quantitative ratio shown in Table 1. The water-soluble polymer (polyvinyl alcohol) was dissolved in water in advance to prepare an aqueous solution, and this aqueous solution was charged into the mixer so that the amount of water-soluble polymer was in the quantitative ratio shown in Table 1. After stirring was completed, the mixture was defoamed to obtain a nail primer composition.

[0091] <Ingredients> The ingredients in Table 1 are as follows: CNF: cellulose nanofiber, water-soluble polymer: polyvinyl alcohol (saponification degree 86.5 mol % to 89.0 mol %), water: purified water, water-soluble organic solvent: glycerin, preservative: potassium sorbate

[0092] <Drying property> The obtained nail primer composition was coated on a nylon plate using a 150 μm bar coater, and the coating was dried by applying a 43° C. hot air dryer to the coating film. The surface of the coating film was touched with a finger, and the drying property was evaluated on a 5-point scale of S, A to D based on the time until the tackiness of the surface disappeared. In the present invention, S, A, and B indicate pass, and C and D indicate fail. The drying property evaluations are also shown in Table 1. S: Dries within 30 seconds. A: Dries in more than 30 seconds but within 1 minute. B: Dries in more than 1 minute but within 2 minutes. C: Dries in more than 2 minutes but within 3 minutes. D: A homogeneous coating film could not be formed.

[0093] <Nail Retention> A nail primer composition was applied to a nail and dried with a 43°C hot air dryer to form a primer layer. Next, a base gel was applied to the primer layer and irradiated with ultraviolet light to form a base gel layer. Next, a top gel was applied to the base gel layer and irradiated with ultraviolet light to form a top gel layer, thereby forming a gel nail on the nail. The resulting gel nail was visually observed for any abnormalities (lifting, peeling, and cracking), and the nail retention was evaluated on a five-point scale of S, A to D. In the present invention, S, A, and B are acceptable, and C and D are unacceptable. The evaluation of nail retention is also shown in Table 1. S: No abnormalities occurred in the gel nail for 30 days or more. A: No abnormalities occurred in the gel nail for 10 to 30 days. B: No abnormalities occurred in the gel nail for 5 to 10 days. C: Abnormalities occurred in the gel nail in less than 5 days. D: A gel nail or a primer layer could not be formed.

[0094] <Vibration Removal> A nail primer composition was applied to a nail and dried with a 43°C hot air dryer to form a primer layer. Next, a base gel was applied to the primer layer and irradiated with ultraviolet light to form a base gel layer. Next, a top gel was applied to the base gel layer and irradiated with ultraviolet light to form a top gel layer, thereby forming a gel nail on the nail. Water was placed in an ultrasonic cleaner, and the nail on which the gel nail had been formed was immersed for 15 seconds in water to which ultrasonic waves of 37 kHz (vibration frequency of 37 kHz) were applied. After immersion, the gel nail was pushed with a pusher, and the removal properties of the gel nail (vibration removability) were visually observed and rated on a 5-point scale (S, A, and D). In the present invention, S, A, and B were considered acceptable, and C and D were considered unacceptable. The vibration removability evaluation is also shown in Table 1. Figure 1 also shows the appearance of Example 1 after peeling. S: Removed cleanly. A: Removed cleanly, although it took some time to partially peel. B: The gel nail cracks and peels off or the primer layer remains on the nail. C: The gel nail does not peel off in parts. D: The gel nail cannot be formed or the gel nail does not peel off.

[0095]

[0096] As shown in Table 1, the nail primer compositions of Examples 1 to 6 can form primer layers with excellent drying properties and nail retention. Furthermore, when removing gel nails from nails, it is possible to easily remove the gel nails by immersing the finger with the gel nails in a vibrated liquid (water). Furthermore, as shown in Figure 1, the method of removing nails from nails using the nail primer compositions of Examples 1 to 6 can remove the gel nails without damaging the nails or skin.

Claims

1. A nail primer composition comprising: (a) cellulose nanofibers; (b) a water-soluble polymer comprising one or more selected from the group consisting of gelatin, polyvinyl alcohol-based resins, water-soluble cellulose, and polyvinylpyrrolidone-based resins; (c) a water-soluble organic solvent; and (d) water, wherein, based on 100% by mass of the total amount of the nail primer composition, (a) the cellulose nanofiber content is 0.1% by mass or more and 15.0% by mass or less; (b) the water-soluble polymer content is 0.05% by mass or more and 30.0% by mass or less; (c) the water-soluble organic solvent content is 0.01% by mass or more and 20.0% by mass or less; and (d) the water content is 50.0% by mass or more and 99.0% by mass or less.

2. The nail primer composition according to claim 1, wherein the water-soluble polymer comprises a polyvinyl alcohol-based resin.

3. A nail primer composition according to claim 1 or 2, wherein the water-soluble organic solvent comprises one or more selected from the group consisting of glycerin, propylene glycol, polyethylene glycol having a number average molecular weight of 700 or less, and ethyl alcohol.

4. A dried coating film of a nail primer composition containing (a) cellulose nanofibers, (b) a water-soluble polymer containing one or more selected from the group consisting of gelatin, polyvinyl alcohol-based resins, water-soluble cellulose, and polyvinylpyrrolidone-based resins, (c) a water-soluble organic solvent, and (d) water, wherein, relative to 100% by mass of the dried coating film of the nail primer composition, (a) the content of the cellulose nanofibers is 40.0% by mass or more and 85.0% by mass or less, and (b) the content of the water-soluble polymer is 10.0% by mass or more and 45.0% by mass or less.

5. A method for peeling a nail from a nail by contacting at least a portion of a nail formed by laminating a primer layer and one or more cured coating layers in this order on the nail with a liquid and applying vibration, wherein the primer layer is a layer formed from a nail primer composition containing: (a) cellulose nanofibers; (b) a water-soluble polymer containing one or more selected from the group consisting of gelatin, polyvinyl alcohol-based resins, water-soluble cellulose, and polyvinylpyrrolidone-based resins; (c) a water-soluble organic solvent; and (d) water, wherein, relative to 100% by mass of the dried coating film of the nail primer composition, (a) the cellulose nanofiber content is 40.0% by mass or more and 85.0% by mass or less; and (b) the water-soluble polymer content is 10.0% by mass or more and 45.0% by mass or less.

6. The method for removing nail from nail according to claim 5, wherein at least a portion of the nail on the nail is immersed in a liquid and vibration is applied.

7. The method for removing nail polish from a nail according to claim 5, wherein the frequency of the vibration is 0.1 kHz or more.

8. A set comprising at least (i) a nail primer composition, and (ii) one or more of a vibration generator, a nail primer composition drying device, a nail-forming material, and a nail-forming material drying and curing device, wherein the nail primer composition contains: (a) cellulose nanofibers, (b) a water-soluble polymer containing one or more selected from the group consisting of gelatin, polyvinyl alcohol-based resins, water-soluble cellulose, and polyvinylpyrrolidone-based resins, (c) a water-soluble organic solvent, and (d) water, wherein, based on 100% by mass of the total amount of the nail primer composition, (a) the cellulose nanofiber content is 0.1% by mass or more and 15.0% by mass or less, (b) the water-soluble polymer content is 0.05% by mass or more and 30.0% by mass or less, (c) the water-soluble organic solvent content is 0.01% by mass or more and 20.0% by mass or less, and (d) the water content is 50.0% by mass or more and 99.0% by mass or less.

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