Primer composition for nails, method for removing nail polish from nails, set comprising at least a primer composition for nails

Abstract

Provided are a primer composition for nails, a method of peeling off a nail from a nail, and a set comprising at least the primer composition for nails. **Solution**: Provided is a primer composition for nails containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent. Also provided is a method of peeling off a nail from a nail by bringing at least a part of the nail, formed by laminating a primer layer and one or more cured coating layers on the nail in this order, into contact with a liquid and applying vibration, wherein the primer layer is a layer formed from the primer composition for nails. Further provided is a set comprising at least one of the primer composition for nails, a vibration generator, a drying device for the primer composition for nails, a nail forming material, and a drying / curing device for the nail forming material.

Description

Technical Field

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

Background Art

[0002] In order to bring out the aesthetics of the fingertips, nails have been provided on the nails. In the past, manicure with synthetic resin paints applied to the nails, and in recent years, gel nails with a thickness of photocurable resin have been widely used. Recently, nail art, which directly decorates one's own fingernails or toenails or attaches artificial nails for decoration, has become increasingly popular. In addition, for the purpose of preventing nail cracks and nail peeling, artificial nails are formed on the nails for reinforcement. For nail decoration and reinforcement, resin-containing materials are applied to the nails.

[0003] Recently, as a material used for nail decoration or reinforcement, a curable composition for (artificial) nails called gel nails has attracted attention. Gel nails are photocurable gel-like nail coating materials (curable compositions for (artificial) nails), and for example, those containing polymerizable compounds such as (meth)acrylate oligomers and (meth)acrylic monomers and a polymerization initiator are known. Gel nails can form a tough film that is difficult to peel off from the nails by applying them to the nails and irradiating them with ultraviolet light to cure and forming a crosslinked polymer film by radical polymerization reaction. As gel nails, those composed of three layers, a base coat layer provided on the nails, a color coat layer provided between the base coat layer and the top coat layer, and a top coat layer provided on the outermost surface, are widely known. When providing gel nails, it is known to form a primer layer on the nails as necessary.

[0004] As a nail primer composition for forming a primer layer on nails, the nail primer compositions disclosed in Patent Document 1 and Patent Document 2 are known. Patent Document 1 discloses an attempt to solve the peeling (off) of gel nails from the perspective of a nail primer composition. Specifically, as a nail primer composition having excellent adhesion of the resulting artificial nails and excellent peelability during removal, it contains a polymer compound having an acid group and an ethylenically unsaturated group and having a weight average molecular weight of 1,000 or more. A nail primer composition is disclosed, characterized in that the acid group is preferably at least one group selected from the group consisting of a carboxy group, a sulfonic acid group, a phosphoric acid group, and a phosphonic acid group. Patent Document 2 discloses a nail primer containing a compound containing a methacryloyl group in the molecule as a nail protectant and a nail protectant kit for preventing, preventing, or restoring the deformation of nails of hands and feet due to diseases (such as trauma) and external forces (such as severe exercise).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] Gel nails on the nails may crack, peel off, chip, etc. when impacted, and when repairing, it may be necessary to peel off (remove) the gel nails. Also, as the nails grow, after a certain period (about 10 days to 30 days) has passed, the gel nails may peel off naturally, and it may be necessary to perform maintenance on the gel nails on the nails, and in that case, it may be necessary to peel off (remove) the gel nails. Also, for the convenience of the user, it may be necessary to remove the gel nails.

[0007] On the one hand, gel nails form a tough film that is difficult to peel off from the nails and has strong adhesiveness to the nails, so it was not easy to remove (peel off) the gel nails from the nails. As methods for removing gel nails from the nails, for example, the following methods (1) to (4) are known. (1) A method of contacting the gel nails with a gel remover which is an organic solvent to soften the gel nails, and then peeling off or scraping off the gel nails using hands or tools. (2) A method of scraping off the gel nails from above the nails using a file or an electric remover (reutter) on the nails on which the gel nails are formed. (3) A method of turning a nail remover containing an organic solvent into vapor with a steam generator, bringing the vapor into contact with the gel nails to soften the gel nails, and then peeling off or scraping off the gel nails using hands or tools. (4) A method of combining the above (1) or (2) with (3).

[0008] In the method using an organic solvent, usually, an organic solvent (for example, acetone) which is volatile, flammable and may damage the skin, nails and human body is used. Therefore, improvements have been demanded in terms of safety, working environment, odor, cost, etc. In the method of peeling off or scraping off the gel nails using tools after softening the gel nails, and the method of scraping off the gel nails from above the nails using a file or an electric remover (reutter), there is a risk of simultaneously scraping off the surface layer of the nails, and there is a risk that gel nails cannot be applied during the nail repair, and there is also a risk of developing symptoms such as discoloration, deformation of the nails, and nail separation. Improvements have been demanded. Also, weakly adherent nails and nails attached to the nails with double-sided tape are known, but the hold of the nails is poor and it is necessary to change the nails in a short time, and improvements have been demanded.

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

Means for Solving the Problems

[0010] The present inventors conducted studies to solve the above problems. As a result, (A) A primer composition for nails containing cellulose nanofibers, a water-soluble polymer, and a water-soluble organic solvent, (B) A method for peeling off nails from the nails by bringing at least a part of the nails formed by laminating a primer layer and one or more cured coating layers on the nails in this order, which are formed from a primer composition for nails containing cellulose nanofibers, a water-soluble polymer, and a water-soluble organic solvent, into contact with a liquid and applying vibration, (C)(i) A set comprising at least a primer composition for nails and (ii) one or more of a vibration generating device, a primer composition drying device for nails, a nail forming material, and a nail forming material drying and curing device, wherein the primer composition for nails is a primer composition for nails containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent. Based on the finding that the above problems can be solved, the present invention has been completed.

[0011] Specifically, it is as follows. [Item 1] (a) Cellulose nanofibers (b) A water-soluble polymer, and (c) A water-soluble organic solvent A primer composition for nails containing the same. [Item 2] The primer composition for nails according to Item 1, wherein the water-soluble polymer contains one or more selected from the group consisting of gelatin, polyvinyl alcohol-based resins, polyacrylic acid, water-soluble cellulose, and polyvinyl pyrrolidone-based resins. [Item 3] The primer composition for nails according to Item 1 or 2, wherein the water-soluble organic solvent contains 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 of detaching a nail from a nail by bringing at least a part of the nail formed by laminating a primer layer and one or more cured coating layers on the nail in this order into contact with a liquid and applying vibration, wherein the primer layer is (a) Cellulose nanofibers (b) A water-soluble polymer, and (c) A water-soluble organic solvent A layer formed from a primer composition for nails containing the same. A method of detaching a nail from a nail. [Item 5] The method of removing a nail from a nail according to claim 4, wherein at least a part of the nail on the claw is immersed in a liquid and vibration is applied. [Claim 6] The method of removing a nail from a nail according to claim 4 or 5, wherein the frequency of the vibration is 0.1 kHz or more. [Claim 7] (i) A primer composition for nails, (ii) A set comprising at least one of a vibration generator, a primer composition drying device for nails, a nail forming material, and a nail forming material drying and curing device, wherein the primer composition for nails contains (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent, and is a primer composition for nails. Set.

Effect of the Invention

Effect of the Invention

[0012] According to the present invention, there is provided a primer composition for nails that has excellent adhesiveness to nails and gel nails and can easily remove (peel off) gel nails from nails by bringing them into contact with a liquid and applying vibration to form a primer layer. According to the present invention, there is provided a primer composition for nails containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent. According to the present invention, there is provided a method of removing a nail from a nail by bringing at least a part of the nail formed by laminating a primer layer and one or more cured coating layers on the nail in this order into contact with a liquid and applying vibration. According to the present invention, there is provided a set comprising (i) a primer composition for nails and (ii) at least one of a vibration generator, a primer composition drying device for nails, a nail forming material, and a nail forming material drying and curing device, wherein the primer composition for nails is a primer composition for nails containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent.

[0013] The primer composition for nails of the present invention, the method for removing nails from the nails of the present invention, and the set comprising at least one of the primer composition for nails of the present invention and a vibration generator, a primer composition drying device for nails, a nail forming material, and a nail forming material drying and curing device can remove nails from the nails on which nails are formed (remove them) without using an organic solvent such as acetone, and without using a file or an electric remover to scrape the nails off the nails. As a result, damage to the nails and skin can be suppressed, and it is possible to safely, easily, and quickly remove the nails from the nails. In addition, due to the flexibility of the cellulose nanofibers, the primer layer can function as a buffer material, and it is presumed that the primer layer can suppress the occurrence of damage such as cracking, peeling, and chipping of the nails by alleviating the impact applied to the nails. However, the present invention is not restricted by this presumption. In addition, by bringing a nail with a primer layer and a nail formed thereon into contact with a liquid (particularly a liquid containing water) and applying vibration to 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, making it possible for the liquid to penetrate into the primer layer. It is presumed that the adhesion of the primer layer decreases, making it easier for the nails to peel off. However, the present invention is not restricted by this presumption.

[0014] The primer composition for nails of the present invention, the method for removing nails from the nails of the present invention, and the set comprising at least one of the primer composition for nails of the present invention and a vibration generator, a primer composition drying device for nails, a nail forming material, and a nail forming material drying and curing device further have the following advantages. · The primer composition for nails of the present invention can be applied using the same means and tools as ordinary primer compositions for nails, without requiring special techniques or tools. · Drying of the primer composition for nails of the present invention can form a primer layer by simply applying a general-purpose dryer for a short time (for example, about 15 seconds). · The primer layer formed from the nail primer composition of the present invention exhibits excellent adhesiveness to both nails and toenails and can achieve a lifespan similar to that of ordinary nails. In addition, since it does not depend on the type of nail, it can be applied to a wide range of nails (gel nails, peel-off nails, manicures, etc.). · The components of the nail primer composition of the present invention are gentle on nails and skin. · When removing the nail, no dissolution and swelling treatment using an organic solvent (such as acetone) or machining is required, which is gentle on the nails, the operator, and the environment. Therefore, nails can be continuously applied without worrying about nail regeneration. · By simply contacting with a liquid (immersing in the liquid) and applying vibration (for example, vibration with a frequency of 0.1 kHz or more), the nail can be safely and easily removed. Therefore, it can respond to cases where it is necessary to change to the next nail design in a short period, can only apply nails on holidays, or urgently remove the nails, and can also respond to cases where nails are applied for a certain period in medical institutions, etc. · It is possible to remove existing nails in a short time, which can improve the turnover rate of nail salons, etc. · By providing a set comprising (i) a nail primer composition and (ii) at least one of a vibration generator, a nail primer composition dryer, a nail forming material, and a nail forming material drying and curing device, the convenience for users, etc. can be enhanced.

Brief Description of the Drawings

[0015]

Figure 1

Embodiments for Carrying Out the Invention

[0016] The primer composition for nails of the present invention, the method of removing nails from the nails of the present invention, and the set comprising at least one of the primer composition for nails of the present invention and a vibration generator, a primer composition drying apparatus for nails, a nail forming material, and a nail forming material drying and curing apparatus will be described in detail. In the present invention, the nail refers to the entire resin layer formed on the primer layer provided on the nail, and examples thereof include gel nails.

[0017] [Primer composition for nails] The primer composition for nails of the present invention is a primer composition for nails containing (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent. The water-soluble polymer can include one or more selected from the group consisting of gelatin, polyvinyl alcohol-based resins, polyacrylic acid, water-soluble cellulose, and polyvinyl pyrrolidone-based resins. The water-soluble organic solvent can 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 (a) cellulose nanofibers contained in the primer composition for nails of the present invention are cellulose microfibers obtained by defibrating a cellulose raw material and refining the fiber diameter.

[0019] The cellulose raw material serving as the raw material for cellulose nanofibers is not particularly limited as long as it contains cellulose. For example, plants (e.g., wood, bamboo, hemp, jute, kenaf, rice husk, straw, bagasse, cotton linter, sisal, agricultural waste, cloth, pulp (softwood kraft pulp (NKP) (unbleached softwood kraft pulp (NUKP), bleached softwood kraft pulp (NBKP), unbleached softwood sulfite pulp (NUSP), and bleached softwood sulfite pulp (NBSP), etc.), hardwood kraft pulp (LKP) (unbleached hardwood kraft pulp (LUKP), bleached hardwood kraft pulp (LBKP), etc.), stone ground pulp (SGP), pressure groundwood pulp (PGW), refiner ground pulp (RGP), chemiground pulp (CGP), thermoground pulp (TGP), ground pulp (GP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), bleached thermomechanical pulp (BTMP), recycled pulp, wastepaper pulp, deinked pulp obtained by deinking wastepaper pulp, etc.)), animals (e.g., tunicates, algae, microorganisms (e.g., acetic acid bacteria (Acetobacter), etc.)), microbial products (microorganism-derived cellulose), regenerated cellulose, etc.) can be used alone or in combination. Preferably, it is plant- or microorganism-derived cellulose, and more preferably plants (plant-derived cellulose such as pulp) can be used.

[0020] The cellulose raw material may be one that has been purified and bleached by cooking or the like. The cellulose raw material may be modified cellulose. The modification can be carried out by modification with a modifier, thermal modification, microwave modification, steam explosion modification, etc. Examples of the modification include one or more of cationic modification, anionic modification, hydrolysis modification, esterification (acylation) modification, etherification modification, silylation modification, etc. For the modification of the cellulose raw material, modifiers such as cationizing agents, anionizing agents, etherifying agents, esterifying agents (acylating agents), silylating agents, acids, alkalis, etc. can be used. Also, in the case of hydrolysis modification, means such as hot water hydrolysis, steam explosion, microwave decomposition, etc. can be used.

[0021] The method for defibrating cellulose is not particularly limited. Defibrating by mechanical treatment and / or defibrating by chemical treatment can be used. Examples of defibrating by mechanical treatment include defibrating by the grinder method using, for example, a mortar-type crusher, defibrating by the underwater counter-collision method in which pulp fibers are dispersed in water and counter-collided under high pressure, high-pressure homogenizers, ultra-high-pressure homogenizers, kneaders, wet or dry grinders (high-pressure collision type grinders, ball mills, colloid mills, roll mills, disk mills, etc.), disk-type refiners, conical refiners, microfluidizers, twin-screw kneaders, vibration mills, high-speed rotary mixers, homomixers, high-speed shear mixers, ultrasonic dispersers, beaters, etc. One or more of these can be used to apply mechanical forces such as impact, shear, torsion, and friction to mechanically refine the cellulose by using one or more of the defibrating methods. Examples of defibrating by chemical treatment include using one or more of hydrolysis treatment with an acid, an enzyme, etc., steaming, bleaching, acid treatment, hydrolysis treatment, regeneration to cellulose, etc.

[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, more preferably 300 or more, and for example, it can be 5,000 or less, preferably 3,500 or less. The degree of polymerization of the cellulose nanofibers means the average degree of polymerization measured according to the reduced specific viscosity method using a copper ethylenediamine solution as described in the confirmation test (3) of the "Fifteenth Revised Japanese Pharmacopoeia Explanation Book (published by Hirokawa Shoten)".

[0023] The weight-average molecular weight (Mw) of the cellulose nanofibers is not particularly limited. For example, it can be 10,000 or more, preferably 50,000 or more, and for example, it can be 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 nanofibers 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) of the cellulose nanofibers and the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) can be controlled by selecting the cellulose raw material, performing physical treatment (defibrillation treatment) and / or chemical treatment on the cellulose raw material. The weight average molecular weight and the number average molecular weight of the cellulose nanofibers can be obtained by dissolving the cellulose nanofibers in N,N-dimethylacetamide added with lithium chloride and subjecting them to gel permeation chromatography using N,N-dimethylacetamide as a solvent.

[0025] The number average fiber diameter of the 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, still more preferably 5.0 nm or more, and for example, 300 nm or less, preferably 200 nm or less, more preferably 100 nm or less, still 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. For example, it can be 10 or more, preferably 20 or more, preferably 30 or more, preferably 50 or more, more preferably 100 or more, and for example, 5,000 or less, preferably 3,000 or less, 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 the cellulose nanofibers are determined by measuring a water dispersion obtained by treating an aqueous dispersion of cellulose nanofibers with a high-shear homogenizer at a rotational speed of 15,000 rpm for 5 minutes to disperse it, diluting the dispersion with pure water to 0.1 to 0.5% by mass, casting it onto mica, and air-drying it, using a scanning electron microscope (SEM) or an atomic force microscope (AFM). Specifically, the fiber length and fiber diameter of each 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 primer composition for nails of the present invention preferably contains an anionic modified cellulose nanofiber as the cellulose nanofiber. Anionic modified cellulose is cellulose constituting the cellulose nanofiber into which an anionic group such as a carboxymethyl group, a carboxyl group, a phosphate ester group, or a sulfate ester group is introduced. For example, one or more selected from the group consisting of carboxymethylated cellulose nanofibers, carboxylated cellulose nanofibers, phosphoric acid esterified cellulose nanofibers, phosphorous acid esterified cellulose nanofibers, and sulfuric acid 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] Anionic modified cellulose nanofibers can be obtained by anionically modifying a cellulose raw material, which is a raw material for the cellulose nanofibers, to obtain an anionic modified cellulose and then defibrating it. Alternatively, they can be obtained by defibrating the cellulose raw material and then anionically modifying it. In the present invention, it is preferable to use an anionic modified cellulose as the cellulose raw material and use the anionic modified cellulose nanofibers obtained by defibrating this.

[0030] As the anionic modified cellulose, which is a raw material for the anionic modified cellulose nanofibers, it is preferable to use an anionic modified cellulose in which peaks of cellulose I-type crystals can be observed when measured by X-ray diffraction. The anionic modified cellulose preferably has 50% or more of cellulose I-type crystals. The crystallinity of the anionic 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 material cellulose and the degree of anionic modification. Examples of the method for measuring the crystallinity of the anionic modified cellulose and the anionic modified cellulose nanofibers include placing the sample in a glass cell and measuring using an X-ray diffraction measuring device.

[0031] As the anionic modified cellulose nanofibers, for example, 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 Auroro Visko (phosphoric acid esterified cellulose nanofibers) manufactured by Oji Paper Co., Ltd. can be used.

[0032] When producing a primer composition for nails, from the viewpoint of handleability and the like, the cellulose nanofibers can be used in the form of a cellulose nanofiber dispersion, preferably an aqueous dispersion of cellulose nanofibers. The cellulose nanofiber dispersion can be obtained, for example, by dispersing a cellulose raw material in a solvent and defibrating it in a dispersed state in the solvent. Further, the cellulose nanofiber dispersion can be obtained by dispersing the cellulose nanofibers obtained by defibrating in a liquid. The solvent constituting the cellulose nanofiber dispersion is not particularly limited. For example, one or more of water, water-soluble organic solvents, and water-insoluble organic solvents can be mentioned. The cellulose nanofiber dispersion may contain one or more of a dispersant and a surfactant, if necessary. The solid content concentration in the cellulose nanofiber dispersion is not particularly limited. For example, the solid content concentration can be 0.5 mass% or more, preferably 1.0 mass% or more, and the solid content concentration can be 20.0 mass% or less, preferably 10.0 mass% or less.

[0033] The content of the cellulose nanofibers can be appropriately adjusted according to the content, viscosity, coatability, etc. of each component in the nail primer composition. Assuming the total amount of the nail primer composition is 100 mass%, for example, it can be 15.0 mass% or less, preferably 10.0 mass% or less, more preferably 8.0 mass% or less, and can be more than 0 mass%, preferably 0.1 mass% or more, more preferably 0.3 mass% or more, still more preferably 0.5 mass% or more. When the content of the cellulose nanofibers exceeds 15.0 mass%, the viscosity of the nail primer composition may increase and it may be difficult to form a primer layer. When the content of the cellulose nanofibers is 0 mass% (in some cases less than 0.1 mass%), it may be difficult to uniformly form a primer layer obtained from the nail primer composition, and it may be difficult to smoothly peel off (remove) the gel nail.

[0034] Also, the content of the cellulose nanofibers can be, for example, 40.0% by mass or more, preferably 45.0% by mass or more, more preferably 55.0% by mass or more, and can be, for example, 85.0% by mass or less, preferably 80.0% by mass or less, more preferably 75.0% by mass or less, based on 100% by mass of the dry coating film of the primer composition for nails.

[0035] <(b) Water-soluble polymer> The (b) water-soluble polymer contained in the primer composition for nails of the present invention has a solubility in water at 25°C exceeding 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, cellulose-based water-soluble resins, water-soluble polysaccharides, water-soluble natural polymers, etc. can be used. The weight average molecular weight of the water-soluble polymer is not particularly limited. For example, it can be 800 or more, preferably 1,000 or more, and can be, 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 oxide (such as polyethylene oxide and polypropylene oxide), 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 cellulose (such as carboxymethyl cellulose, carboxyethyl cellulose, and sodium carboxymethyl cellulose), hydroxyalkyl cellulose (such as hydroxyethyl cellulose and hydroxypropyl cellulose), hydroxydialkyl cellulose (such as hydroxypropylmethyl cellulose), alkyl cellulose (such as methyl cellulose, ethyl cellulose, propyl cellulose, and butyl cellulose), and alkyl cellulose alkyl ether. One or more 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, cellulose-based water-soluble 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 primer composition for nails of the present invention, as the water-soluble polymer, it is particularly preferable to use one or more selected from the group consisting of gelatin, polyvinyl alcohol-based resin, polyacrylic acid, water-soluble cellulose, and polyvinyl pyrrolidone-based resin.

[0039] In the primer composition for nails of the present invention, the 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 primer composition for nails can be prepared using this. In the primer composition for nails of the present invention, the 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 primer composition for nails can be prepared using this.

[0040] The content of the water-soluble polymer can be appropriately adjusted according to the content of each component, viscosity, coatability, etc. in the primer composition for nails. Assuming the total amount of the primer composition for nails is 100% by mass, it 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, and can be more than 0% by mass, preferably 0.05% by mass or more, more preferably 0.2% by mass or more. When the content of the water-soluble polymer exceeds 30.0% by mass, the viscosity of the primer composition for nails may increase and it may be difficult to form a primer layer. When the content of the water-soluble polymer is 0% by mass (in some cases less than 0.05% by mass), the components of the primer composition for nails may not become uniform, and it may also be difficult to form a primer layer.

[0041] Also, the content of the water-soluble polymer can be, for example, 10.0% by mass or more, preferably 12.0% by mass or more, more preferably 15.0% by mass or more, and, for example, 45.0% by mass or less, preferably 35.0% by mass or less, more preferably 25.0% by mass or less, based on 100% by mass of the dry coating film of the nail primer composition.

[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 having 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 uniformly miscible in any ratio. For example, one or more 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 monoalcohols, 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 the polyhydric alcohols include one or more selected from the group consisting of 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-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, etc.

[0045] Examples of alkyl ethers of polyhydric alcohols include one or more selected from the group consisting of glycol dialkyl ethers such as 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, triethylene glycol monopropyl ether, triethylene glycol monobutyl ether, tetraethylene 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, tetraethylene glycol diethyl ether, etc. can be used.

[0046] Examples of esters include one or more selected from the group consisting of γ-butyrolactone, γ-valerolactone, δ-valerolactone, ε-caprolactone, etc. can be used.

[0047] As nitrogen-containing solvents, for example, one or more selected from the group consisting of 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, N,N-dimethyl-β-heptoxypropionamide, 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, N,N-diethyl-β-octoxypropionamide, etc. 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, it is one or more selected from the group consisting of 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 glycol with a number average molecular weight of 700 or less, polypropylene glycol with a number average molecular weight of 700 or less, glycerin, diglycerin, triglycerin, pentaerythritol, and even more preferably, it is one or more selected from the group consisting of ethyl alcohol, ethylene glycol, propylene glycol, diethylene glycol, polyethylene glycol with a number average molecular weight of 700 or less, and glycerin.

[0049] In the primer composition for nails of the present invention, as the water-soluble organic solvent, it is particularly preferable to use 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 according to the content of each component, viscosity, coatability, etc. in the primer composition for nails. Assuming the total amount of the primer composition for nails is 100% by mass, for example, it can be 20.0% by mass or less, preferably 10.0% by mass or less, more preferably 5.0% by mass or less, and can be more than 0% by mass, preferably 0.01% by mass or more, more preferably 0.05% by mass or more. When the content of the water-soluble polymer exceeds 20.0% by mass, the active ingredient of the primer composition for nails may decrease, and it may be difficult to form a primer layer. When the content of the water-soluble polymer is 0% by mass (in some cases less than 0.01% by mass), the drying of the primer composition for nails may be too fast, and the storage stability may deteriorate.

[0051] <(d) Water> In addition to the above (a) to (c), the primer composition for nails of the present invention can contain water. As the water, for example, tap water, purified water, distilled water, ion-exchanged water, or pure water is used. Preferably, purified water, pure water, ion-exchanged water, or distilled water can be used.

[0052] The content of water can be appropriately adjusted according to the content of each component, viscosity, etc. in the primer composition for nails. Assuming the total amount of the primer composition for nails is 100% by mass, for example, it can be 99.0% by mass or less, preferably 98.0% by mass or less, and can be 0% by mass or more, preferably 30.0% by mass or more, more preferably 50.0% by mass or more. When the content of water exceeds 99.0% by mass, the active ingredient of the primer composition for nails may decrease, and it may be difficult to form a primer layer.

[0053] <Other components> The primer composition for nails of the present invention may contain various components as "other components" in addition to the above (a) to (d), as long as it does not adversely affect drying property, nail retention property, vibration release property, storage stability, gel nail forming property, gel nail design property, primer film adhesiveness, viscosity, handleability, coatability, etc. Examples of the other components include one or more selected from the group consisting of preservatives, colorants, surfactants, resins other than the above (a) and (b), solvents other than the above (c) and (d), fragrances, fillers, defoamers, antioxidants, leveling agents, wetting improvers, decorative materials, antibacterial agents, etc.

[0054] (Preservative) The preservative that the primer composition for nails of the present invention may contain is not particularly limited as long as it can exhibit the function of preventing the spoilage (microbial growth) of the primer composition for nails. Examples of the preservative include acids such as benzoic acid, benzoates, salicylic acid, salicylates, dehydroacetic acid, dehydroacetates, sorbic acid, sorbates; phenols such as phenoxyethanol, hinokitiol, hydroxybenzothiazole, paraoxybenzoic acid esters (parabens); halogenated bisphenols such as hexachlorophene, 2,4,4'-trichloro-2'-hydroxydiphenyl ether (triclosan); amides such as 3,4,4'-trichlorocarbanilide, 3-trifluoromethyl-4,4'-dichlorocarbanilide (halocarban); chlorhexidine gluconate, chlorhexidine hydrochloride, tetramethylthiuram disulfide (thiram), photosensitizer 201, photosensitizer 101, 1-hydroxypyridine-2-thione (zinc pyrithione), imidazoylurea compound (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, etc. One or more selected from the group consisting of them can be used.

[0055] The content of the preservative is not particularly limited. As the content of the preservative, for example, it can be 0% by mass or more, preferably 0.001% by mass or more, more preferably 0.007% by mass or more, based on the total amount of the nail primer composition, and can be 1% by mass or less, preferably 0.5% by mass or less, more preferably 0.07% by mass or less. When the content of the preservative is less than 0.001% by mass based on the total amount of the nail primer composition, problems may occur in terms of the preservative ability. When it exceeds 1% by mass, it will exceed the cosmetic additive standard.

[0056] (Colorant) The colorant that the nail primer composition of the present invention may contain is not particularly limited as long as it can make the nail primer composition have an arbitrary color tone. As the colorant, for example, one or more selected from the group consisting of inorganic coloring pigments, organic coloring pigments, glitter pigments, fluorescent pigments, colored resin particles, dyes, etc. can be used. As the state of the colorant, particulate or dispersion liquid forms can be used. Also, in order to obtain a desired color tone, two or more colorants can be mixed and used. When using particles such as pigments and colored resin particles as the colorant, those that are not surface-treated can be used, and those surface-treated with a surface treatment agent such as a silane coupling agent, resin, pigment derivative, etc. can also be used.

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

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

[0059] As the organic coloring pigment, for example, one or more selected from the group consisting of azo pigments, azomethine pigments, aniline black, anthrapyrimidine pigments, anthraquinone pigments, isoindolinone pigments, isoindoline pigments, indigo pigments, indolene 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, benzimidazolone pigments, etc. can be used.

[0060] As the bright pigment, for example, metal powders and metal foils such as gold, silver, copper, chromium, titanium, nickel, aluminum, brass, stainless steel, etc.; flake pigments such as mica, synthetic mica, silica flakes, aluminum flakes, aluminum oxide flakes, iron oxide flakes, metal oxide flakes, glass flakes, etc., and these flake pigments (flake-shaped substrates) are coated with one or more thin films of titanium oxide, iron oxide, silica, tin oxide, zirconium oxide, chromium oxide, aluminum oxide, gold, silver, nickel, chromium, titanium, aluminum, magnesium fluoride, titanium nitride, etc. by one or more layers; nacreous pigments such as fish scale foil, bismuth oxychloride, etc.; light-reflective pigments; light-interference pigments, etc. One or more selected from the group consisting of can be used.

[0061] As the dye, 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. can be mentioned. As the dye, one or more selected from the group consisting of acid dyes, direct dyes, basic dyes, reactive dyes, and food dyes can be used.

[0062] As the fluorescent pigment, one or more selected from pigments that use light of a specific wavelength in the ultraviolet region, visible light region, and infrared region as excitation energy and emit light in a wavelength range different from the said wavelength can be used. The colored resin particles are fine particles of a mixture of one or more of the above-mentioned coloring pigments, metallic pigments, fluorescent pigments, dyes, etc. and a resin. As the resin, one or more of resins such as polyolefin resins, polystyrene resins, acrylic resins, polyester resins, polyurethane resins, etc. can be used, and one or more of the colored resin pigments can be used.

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

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

[0065] (Resins other than the above (a) and (b)) The resins other than the above (a) and (b) that the nail primer composition of the present invention may contain can function as a thickener or an adhesion improver in the nail primer composition, and are not particularly limited as long as they can fix a primer layer on the nail after the solvent has volatilized after application. Examples of the resin other than the above (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, polymer polyols, and the like. The weight average molecular weight of the resin other than the above (a) and (b) is not particularly limited. For example, it is preferably 100 or more and 100,000 or less.

[0066] (Solvent other than the above (c) and (d)) The solvent other than the above (c) and (d) that the nail primer composition of the present invention may contain can function as a diluent in the nail primer composition, and is not particularly limited as long as it can adjust the viscosity during coating by dilution. Examples of the solvent other than the above (c) and (d) 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; acetic acid esters such as methyl acetate, ethyl acetate, and butyl acetate; and diacetone alcohol.

[0067] <Use of the nail primer composition> The nail primer composition of the present invention is used to form a primer layer for forming a gel nail directly on the nail or on a coating film provided on the nail. In the present invention, the period until the gel nail peels off can be adjusted by the area of the primer layer formed directly on the nail or on a coating film provided on the nail. The primer composition for nails of the present invention is excellent in adhesion to nails and gel nails, and can be used to form a primer layer that can easily peel off (remove) the gel nails from the nails by contacting with a liquid and applying vibration. The frequency of the applied vibration is not particularly limited. For example, it can be 0.1 kHz or more, preferably 0.12 kHz or more, more preferably 0.15 kHz or more, and can be 50 kHz or less, preferably 45 kHz or less, more preferably 40 kHz or less.

[0068] [Method for Removing Nail from Nail] The method for removing a nail from a nail of the present invention is a method for removing a nail from a nail by bringing at least a part of the nail formed by laminating a primer layer and one or more cured coating layers in this order on the nail into contact with a liquid and applying vibration, wherein the primer layer is (a) cellulose nanofibers, (b) a water-soluble polymer, and (c) a water-soluble organic solvent, and is a layer formed from a primer composition for nails.

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

[0070] The gel nails formed by laminating a cured coating layer on the primer layer can be formed, for example, using a curable composition for (artificial) nails (curable composition for artificial nails and / or curable composition for nails). As the curable artificial nail composition for (artificial) nails, for example, those 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] (a) As the overlapping compound, it is preferable to include a polymerizable compound containing a (meth)acryloyl group. The (meth)acryloyl group-containing polymerizable compound has one or more (meth)acryloyl groups in the molecule and is a compound that can be cured by irradiating energy rays such as light. As the polymerizable compound, as the (meth)acryloyl group-containing polymerizable compound, it is preferable to use one containing a (meth)acrylate oligomer and / or a (meth)acrylate monomer.

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

[0073] (b) As the polymerization initiator, those which can generate radicals by being given energy by irradiation with light (for example, ultraviolet rays), heat, etc., and can initiate the polymerization of the polymerizable compound in (a) are not particularly limited as long as they can initiate the polymerization. For example, acylphosphine oxide-based, α-hydroxyalkylphenone-based, benzoin ether-based, benzyl ketal-based, acid ester-based, α-aminoalkylphenone-based, benzophenone-based, thioxanthone-based, titanocene-based, quinone-based, peroxide-based, azo-based, persulfate-based, etc. One or more polymerization initiators selected from the group consisting of can be mentioned. For example, when irradiating ultraviolet rays with 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-based polymerization initiator.

[0074] (c) As the colorant, those which can make the curable composition for (artificial) nails have a desired color tone can be used, for example, one or more selected from the group consisting of pigments, brighteners, and dyes. (d) As the chain transfer agent, for example, a polyfunctional thiol compound having two or more thiol groups in the molecule can be used. The chain transfer agent can also exhibit functions as a curability regulator, a crosslinking agent, and a viscosity regulator. (e) As the polymerization inhibitor, for example, one or more selected from the group consisting of tocopherol-based compounds, quinone-based compounds, phenol-based compounds, catechol-based compounds, oxydiphenylamine-based compounds, nitroso-based compounds, nitrone-based compounds, nitrile-based compounds, hydrazyl-based compounds, phenothiazine-based compounds, etc. can be used. In addition to the above (a) to (e), the curable composition for (artificial) nails may contain one or more selected from the group consisting of various additives such as resins, polyol compounds, solvents, fragrances, anti-settling agents, defoaming agents, silane coupling agents, polymerization accelerators, surface tension regulators, flame retardants, antioxidants, ion adsorbents, low stress agents, preservatives, antibacterial agents, flexibility imparting agents, waxes, halogen traps, leveling agents, wetting improvers, decorative materials, etc.

[0075] The viscosity of the curable composition for (artificial) nails 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 such a range, the application operation using an applicator such as a brush or an inkjet can be easily performed. The curable composition for (artificial) nails can be applied onto the primer layer of the primer composition for nails formed on the nails of a human hand and / or foot nails, and the nails of animals such as dogs and cats to form nails. The application method is not particularly limited, and for example, an applicator such as a brush or an application method such as an inkjet can be used.

[0076] As a means for curing the curable composition for (artificial) nails after application to form nails, there is no particular limitation as long as it is a means capable of imparting energy for causing curing. For example, energy beam irradiation such as light (such as ultraviolet rays (UV)), electron beams, heat, etc. can be mentioned. In particular, curing by ultraviolet ray (UV) irradiation is preferable. As an irradiation source during energy beam irradiation, for example, known ultraviolet light sources such as a mercury lamp, a metal halide lamp, an ultraviolet light emitting diode (UV-LED), an ultraviolet laser diode (UV-LD), etc. can be used, and among them, an ultraviolet light emitting diode and an ultraviolet laser diode (UV-LD) are preferable.

[0077] In the method for peeling off the nail from the nail of the present invention, the liquid 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 causes little irritation or influence to the nail and the skin. For example, those containing water and / or an organic solvent can be used. As the organic solvent, those containing the water-soluble organic solvent constituting the [primer composition for nails] can be used. In the method for peeling off the nail from the nail of the present invention, it is preferable to use a liquid containing water. As a means for bringing the liquid into contact with the nail, for example, one or more of immersion in the liquid, spraying of the liquid, dropping of the liquid, flowing down of the liquid, etc. can be used. In particular, the means of immersion in the liquid is preferable.

[0078] In the method of removing a nail from a nail according to the present invention, the frequency of the applied vibration is not particularly limited. For example, it can be 0.1 kHz or more, preferably 0.12 kHz or more, more preferably 0.15 kHz or more, and can be 50 kHz or less, preferably 45 kHz or less, more preferably 40 kHz or less. The application of vibration is preferably performed by bringing a liquid into contact with the nail, 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. As the vibration generator used when applying vibration, those provided with a motor and a vibrating body driven by the motor, those provided with a piezoelectric body, those provided with a coil, etc. can be used.

[0079] The method of removing a nail from a nail according to the present invention can be performed only by bringing it into contact with a liquid and applying vibration to separate the nail (off) on the nail, and can be performed in a short time without damaging the nail or the skin.

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

[0081] As the primer composition for nails in the set, the primer composition for nails described in the above [primer composition for nails] is used.

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

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

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

[0085] The nail forming material drying and curing device in the set is not particularly limited as long as it can dry and / or cure the nail forming material. For example, the same device as the primer drying device for nails can be used. Also, when the nail forming material is a gel-like nail coating material ((artificial) curable composition for nails), a device capable of applying energy to cause curing can be used. For example, an energy ray irradiation device such as light (ultraviolet rays (UV), etc.), electron beams, heat, etc. can be used. In particular, it is preferable to use an ultraviolet ray (UV) irradiation device. As the irradiation source in the energy ray irradiation device, 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. can be used, and among them, an ultraviolet light emitting diode and an ultraviolet laser diode (UV-LD) are preferable.

[0086] Examples of the set include, for example, sets comprising the following. <1> A primer composition for nails and a vibration generating device. <2> A primer composition for nails and a primer composition drying device for nails. <3> A primer composition for nails and a nail forming material. <4> A primer composition for nails, a vibration generating device, and a primer composition drying device for nails. <5> A primer composition for nails, a vibration generating device, and a nail forming material. <6> A primer composition for nails, a primer composition drying device for nails, and a nail forming material. <7> A primer composition for nails, a nail forming material, and a nail forming material drying and curing device. <8> A primer composition for nails, a vibration generating device, a primer composition drying device for nails, and a nail forming material. <9> A primer composition for nails, a vibration generating device, a nail forming material, and a nail forming material drying and curing device. <10> A primer composition for nails, a primer composition drying device for nails, a nail forming material, and a nail forming material drying and curing device. <11>Nail primer composition, vibration generator, nail primer composition drying device, nail forming material, and nail forming material drying and curing device.

[0087] In the set of the present invention, a set comprising at least a nail primer composition and a vibration generator can be preferably used in the invention according to the [method of detaching a nail from a nail]. Therefore, in order to bring at least a part of the nail on the nail into contact with a liquid, preferably immerse it in the liquid, it is preferable to provide a container for storing the liquid. As the liquid used at this time, the liquid brought into contact with the nail in the [method of detaching a nail from a nail] can be used. With the set comprising at least a nail primer composition and a vibration generator in the set of the present invention, it becomes possible to easily implement the invention according to the [method of detaching a nail from a nail] even in an existing nail salon or the like.

[0088] With the set comprising a nail primer composition, a vibration generator, and a nail forming material in the set of the present invention, just by preparing the set, the user can easily form gel nails by themselves and can easily remove the gel nails.

Example

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

[0090] [Examples 1 to 6, Comparative Examples 1 to 2] The components shown in Table 1 were put into a stainless steel mixer so as to have the amount ratios (parts by mass) shown in Table 1, and stirred in an air atmosphere at 25°C and 1 atm. Cellulose nanofibers (hereinafter sometimes referred to as “CNF”) were previously dispersed in water to form an aqueous dispersion, and the aqueous dispersion was put into the mixer so that the amount of CNF became the amount ratio shown in Table 1. The water-soluble polymer (polyvinyl alcohol) was dissolved in water in advance to form an aqueous solution, and the aqueous solution was put into a mixer so that the amount of the water-soluble polymer was in the ratio shown in Table 1. After completion of stirring, defoaming was carried out to obtain a primer composition for nails.

[0091] <Component> The components in Table 1 are as follows respectively. CNF: Cellulose nanofiber Water-soluble polymer: Polyvinyl alcohol (saponification degree 86.5 mol% - 89.0 mol%) Water: Purified water Water-soluble organic solvent: Glycerin Preservative: Potassium sorbate

[0092] <Drying property> The obtained primer composition for nails was applied to a nylon plate using a 150 μm bar coater, and a 43 °C hot air dryer was applied to the coating film for drying. The surface of the coating film was touched with a finger, and the drying property was evaluated in 5 grades of S, A - D based on the time until the tackiness of the surface disappeared. In the present invention, passing grades are S, A and B, and failing grades are C and D. The evaluation of the drying property is shown together with Table 1. S: Dries within 30 seconds. A: Dries in more than 30 seconds and within 1 minute. B: Dries in more than 1 minute and within 2 minutes. C: Dries in more than 2 minutes and within 3 minutes. D: A uniform coating film cannot be formed.

[0093] <Nail retention> On the nail, the primer composition for nails was applied and dried with a 43 °C hot air dryer to form a primer layer. Next, a base gel was applied on the primer layer and irradiated with ultraviolet rays to form a base gel layer. Next, a top gel was applied on the base gel layer and irradiated with ultraviolet rays to form a top gel layer, and a gel nail was formed on the nail. For the obtained gel nails, the occurrence of abnormalities (lifting, peeling, and cracking) was visually observed, and the nail retention was evaluated on a 5 - point scale of S, A - D. In the present invention, the passing grades are S, A, and B, and the failing grades are C and D. The evaluation of nail retention is shown in Table 1. S: No abnormalities occur in the gel nails for 30 days or more. A: No abnormalities occur in the gel nails for more than 10 days and less than 30 days. B: No abnormalities occur in the gel nails for more than 5 days and less than 10 days. C: Abnormalities occur in the gel nails within less than 5 days. D: It is impossible to form a gel nail or a primer layer cannot be formed.

[0094] <Vibration detachment property> A nail primer composition was applied onto the nail and dried with a 43°C warm air dryer to form a primer layer. Next, a base gel was applied onto the primer layer and irradiated with ultraviolet light to form a base gel layer. Then, a top gel was applied onto the base gel layer and irradiated with ultraviolet light to form a top gel layer, and a gel nail was formed on the nail. Water was put into an ultrasonic cleaner, and the nail with the formed gel nail was immersed in the water with ultrasonic waves (vibrations with a frequency of 37 kHz) applied for 15 seconds. After immersion, the gel nail was pushed with a pusher, and the off - property (vibration detachment property) of the gel nail was visually observed and evaluated on a 5 - point scale of S, A - D. In the present invention, the passing grades are S, A, and B, and the failing grades are C and D. The evaluation of vibration detachment property is shown in Table 1. Also, in Example 1, the state after peeling is shown in Figure 1. S: It peels off cleanly. A: It takes time for partial peeling, but it peels off cleanly. B: The gel nail cracks and peels off or the primer layer remains on the nail. C: The gel nail does not partially peel off. D: It is impossible to form a gel nail or the gel nail does not peel off.

[0095]

Table 1

[0096] As shown in Table 1, the primer compositions for nails of Examples 1 to 6 can form a primer layer excellent in dryness and nail retention. Moreover, when removing the gel nail on the nail, it can be seen that the gel nail can be easily removed by immersing the finger with the formed gel nail in a vibrating liquid (water). Also, as shown in FIG. 1, it can be seen that the method of removing the nail from the nail using the primer compositions for nails of Examples 1 to 6 can remove the gel nail without damaging the nail or the skin.

Claims

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

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

3. 3. The nail primer composition according to claim 1, wherein the water-soluble organic solvent comprises at least one 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) cellulose nanofibers, (b) a water-soluble polymer containing at least one selected from the group consisting of gelatin, a polyvinyl alcohol-based resin, a water-soluble cellulose, and a polyvinylpyrrolidone-based resin; (c) a water-soluble organic solvent, and (d) water; A dried coating of a nail primer composition comprising: Based on 100% by mass of the dried coating film of the nail primer composition, (a) the content of cellulose nanofibers is 40.0% by mass or more and 85.0% by mass or less; (b) the content of the water-soluble polymer is 10.0% by mass or more and 45.0% by mass or less; A dried coating of the nail primer composition.

5. A method for peeling a nail from a nail by contacting at least a part of a nail formed by laminating a primer layer and one or more cured coating layers on a nail in this order with a liquid and applying vibration thereto, comprising the steps of: The primer layer is (a) cellulose nanofibers, (b) a water-soluble polymer containing at least one selected from the group consisting of gelatin, a polyvinyl alcohol-based resin, a water-soluble cellulose, and a polyvinylpyrrolidone-based resin; (c) a water-soluble organic solvent, and (d) water; A layer formed from a nail primer composition comprising: Based on 100% by mass of the dried coating film of the nail primer composition, (a) the content of cellulose nanofibers is 40.0% by mass or more and 85.0% by mass or less; (b) the content of the water-soluble polymer is 10.0% by mass or more and 45.0% by mass or less; Here's how to remove nail polish from your nails.

6. 6. The method for removing nail from nail according to claim 5, further comprising immersing at least a portion of the nail on the nail in a liquid and applying vibrations to the liquid.

7. 7. The method for removing nail from a nail according to claim 5 or 6, wherein the frequency of the vibration is 0.1 kHz or more.

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

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