Curable artificial nail composition

Abstract

To provide a curable artificial nail composition which has a viscosity feeling in visual recognition, has a viscosity excellent in coatability and handleability in actual coating, has a viscosity capable of forming a desired film thickness by coating, develops thixotropy for developing a special coating feeling / viscosity state, and forms a cured coating film excellent in adhesiveness to an object to be coated.SOLUTION: A curable artificial nail composition comprising (A) a urethane (meth) acrylate oligomer, (B) an alicyclic monofunctional (meth) acrylate compound, (C) a hydroxyl group-containing (meth) acrylate compound, (D) an acylphosphine-based polymerization initiator, (E) a polymerization initiator other than the acylphosphine-based polymerization initiator, and (F) an inorganic filler, wherein the content of the inorganic filler (F) is more than 0% by mass and 7.0% by mass or less in 100% by mass of the total amount of the curable artificial nail composition.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a curable artificial nail composition. [Background technology]

[0002] Nail art, which involves decorating natural fingernails or toenails or gluing artificial nails onto them, is becoming increasingly popular. Artificial nails are also being formed on top of natural nails to reinforce them and prevent them from cracking or peeling due to external forces. For such nail decoration or reinforcement, resin-containing materials known as manicures, pedicures, and sculptures are applied to the nails.

[0003] As a material used for decorating or reinforcing nails, a photocurable artificial nail composition known as gel nails has been attracting attention. Gel nails are photocurable gel-type nail coating materials (photocurable artificial nail compositions), and are known to contain, for example, a (meth)acrylate oligomer and a (meth)acrylic monomer. Gel nails are applied to nails and cured by irradiating them with ultraviolet light, forming a crosslinked polymer coating through a radical polymerization reaction, which is believed to form a tough coating that is resistant to peeling from the nail. Patent Documents 1 to 6 disclose photocurable gel nail coating materials (photocurable artificial nail compositions) called gel nails, which contain, for example, a (meth)acrylate compound. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-55771 [Patent Document 2] Japanese Patent Publication No. 2022-167213 [Patent Document 3] Japanese Patent Application Laid-Open No. 2013-43853 [Patent Document 4] Japanese Patent Application Publication No. 2019-85394 [Patent Document 5] Japanese Patent Publication No. 2020-152793 [Patent Document 6] Japanese Patent Application Laid-Open No. 2017-105759 Summary of the Invention [Problem to be solved by the invention]

[0005] Curable artificial nail compositions for forming gel nails are required to have a sufficient viscosity (viscosity when visually recognized) to give the practitioner a sense of security about the curable artificial nail composition, a viscosity that provides excellent applicability and handling during actual application, a viscosity that allows the desired film thickness to be formed by application, and thixotropy that provides a special application feel and viscosity state. In the fields of paints and inks, it is known to add inorganic fillers (thixotropic agents) such as silica to impart thixotropy. However, when inorganic fillers (thixotropic agents) such as silica are used in a curable artificial nail composition, the adhesiveness between the nail and the cured coating film may be reduced due to the influence of the inorganic filler (thixotropic agent), which is an inorganic substance, because nails are organic, and this reduces the durability of the gel nail (the durability of the cured coating film), and therefore, this has not been commonly used.

[0006] The problem that the present invention aims to solve is to provide a curable artificial nail composition that has a sense of viscosity when visually recognized, has a viscosity that is excellent in applicability and handleability during actual application, has a viscosity that allows a desired film thickness to be formed upon application, exhibits thixotropy that provides a special application feel and viscosity state, and forms a cured coating film that has excellent adhesion to the substrate. [Means for solving the problem]

[0007] As a result of extensive research into solving the above problems, the present inventors have found that the above problems can be solved by a curable artificial nail composition having a specific composition, and have thus completed the present invention. Specifically, the following applies: [Section 1] (A) urethane (meth)acrylate oligomer, (B) an alicyclic monofunctional (meth)acrylate compound, (C) a hydroxyl group-containing (meth)acrylate compound, (D) an acylphosphine polymerization initiator, (E) a polymerization initiator other than an acylphosphine polymerization initiator, (F) inorganic filler, wherein the content of the inorganic filler (F) is more than 0 mass % and not more than 7.0 mass % based on 100 mass % of the total amount of the curable artificial nail composition. [Section 2] Item 1. The curable artificial nail composition according to Item 1, which is used to form a base coat layer of a gel nail. [Effects of the Invention]

[0008] The present invention provides a curable artificial nail composition that has a sense of viscosity when visually recognized, a viscosity that is excellent in applicability and handleability during actual application, a viscosity that allows a desired film thickness to be formed upon application, thixotropy that provides a special application feel and viscosity state, and that forms a cured coating film that has excellent adhesion to the substrate. The curable artificial nail composition of the present invention can be suitably used as a curable artificial nail composition for forming a base coat layer for gel nails. The mechanism by which the curable artificial nail composition of the present invention exerts such effects is unknown, but the present inventors speculate as follows.

[0009] If the curable artificial nail composition does not contain any inorganic filler (thixotropic agent) such as silica, the thixotropy due to the inorganic filler (thixotropic agent) such as silica cannot be expected to be exhibited, and therefore it is thought that it is not possible to expect the composition to have a viscous feel when visually recognized, a viscosity that is excellent in applicability and handleability during actual application, and a viscosity that allows the desired film thickness to be formed upon application, and to exhibit a special application feel and viscosity state. On the other hand, if a large amount of inorganic filler (thixotropic agent) such as silica is contained in the curable artificial nail composition, the composition can be expected to exhibit thixotropy, but the probability of silica being present between the nail and the cured coating film increases, which reduces the contact area between the coating film-forming components and the nail, making it difficult to ensure adhesion between the nail and the cured coating film. It is presumed that by including a specific amount of inorganic filler (thixotropic agent) in the curable artificial nail composition of the present invention, thixotropy is exhibited due to interactions between the inorganic fillers (thixotropic agents), improving the cohesive strength of the coating film of the curable artificial nail composition and the cured coating film; on the other hand, by controlling the amount of inorganic filler (thixotropic agent) present between the substrate and the cured coating film, it is possible to provide a curable artificial nail composition that has a sense of viscosity when viewed visually, a viscosity that is excellent in applicability and handleability during actual application, a viscosity that allows for the formation of a desired film thickness upon application, exhibits thixotropy that exhibits a special application feel and viscosity state, and forms a cured coating film that has excellent adhesion to the substrate. However, the present invention is not limited to these speculations. DETAILED DESCRIPTION OF THE INVENTION

[0010] The curable artificial nail composition of the present invention will be described below. As used herein, "(meth)acrylate" refers to "acrylate" and "methacrylate."

[0011] [(A) Urethane (meth)acrylate oligomer] The urethane (meth)acrylate oligomer (A) contained in the curable artificial nail composition of the present invention is not particularly limited as long as it is an oligomer having one or more (meth)acryloyloxy groups (CH═CHCOO— groups and / or CH═C(CH)COO— groups) in the molecule, a urethane bond in the main skeleton, and a plurality of repeating units. The (A) urethane (meth)acrylate oligomer provides the effects of optimizing the viscosity of the curable artificial nail composition and adjusting the curability, and further provides the effects of optimizing the temperature rise during curing of the curable artificial nail composition, the release properties of the cured coating film, the hardness of the cured coating film, and the elongation of the cured coating film.

[0012] The weight-average molecular weight of the (A) urethane (meth)acrylate oligomer is not particularly limited. For example, it can be 1,000 or more, preferably 5,000 or more, more preferably 10,000 or more, and can be 100,000 or less, preferably 50,000 or less, more preferably 30,000 or less. By setting the weight-average molecular weight within this range, it is possible to improve the durability of the cured coating film while maintaining low viscosity.

[0013] The number of (meth)acryloyl groups contained in the molecule of (A) urethane (meth)acrylate oligomer is not particularly limited, but from the viewpoints of the curability of the curable artificial nail composition, the hardness of the cured coating film, and the like, it is 1 or more and 10 or less, preferably 2 or more and 8 or less, and more preferably 2 or more and 6 or less. The number of (meth)acryloyl groups can be confirmed by analysis using infrared absorption spectroscopy (IR), nuclear magnetic resonance (NMR), gas chromatography mass spectrometry (GC / MS), or the like.

[0014] The (A) urethane (meth)acrylate oligomer can be synthesized, for example, by reacting a polyol with a polyisocyanate to form an isocyanate group- or hydroxyl group-containing urethane prepolymer, and then reacting the isocyanate group- or hydroxyl group-containing urethane prepolymer with a compound having an active hydrogen-containing group and a (meth)acryloyl group in the molecule (hydroxyalkyl (meth)acrylate, (meth)acrylic acid, etc.) or a compound having an isocyanate group and a (meth)acryloyl group in the molecule, but the synthesis method is not limited to this. The (A) urethane (meth)acrylate oligomer can be selected from those having one or more skeletons selected from the group consisting of a polyether skeleton, a polycarbonate skeleton, a polyester skeleton, an acrylic skeleton, and a polyolefin skeleton.

[0015] The urethane (meth)acrylate oligomer (A) may be either a commercially available product or a synthetic product. Examples of commercially available products include: KSM SUA TH1, SUA-TH2, KN20-32, SUA-16N, etc. Mitsubishi Chemical Shiko series (UV-6640B, UV-3300B, UV-3700B, UV-3310B, UV-3500BA, UV3200B, UV-3000B, UV -3520EA, UV-7610B, UV-1700B, UV-6300B, UV-6630B, UV-7620B, UV-7630, UV-7640B, UV-7650B, etc.); Negami Industrial Co., Ltd. Art Resin series (UN-6200, UN-6207, UN-6304, UN-6305, UN-6306, UN-6307, UN-6060S, PMH-101B, PMH-401B, MB-191, UN-9000PEP, UN-9200A, UN-353, UN-350, UN-7600, UN-770 0, MBU-71, UN-952, UN-905, H-575, UN-6303PR, STQI-037PR, UN-5500, UN-5590, UN-333, U N-3320HA, UN-3320HC, UN-904, UN-901T, UN-954, UN-2310, UN-2601, UN-2701, SMT-001, etc.); Daicel-Allnex EBECRYL series (230, 4491, 8411, 3700, 210, 220, 270, 4220, 4666, 4680, 4820, 8402, 8701, etc.); Daicel Allnex KRM series (9465, 9556, 8961, 2000, 7735, 8904, 8452, 8528, 8296, etc.); Examples of suitable compounds include, but are not limited to, one or more selected from the group consisting of:

[0016] In the present invention, the (A) urethane (meth)acrylate oligomer is preferably at least one of a polyether-based urethane (meth)acrylate oligomer having a polyether skeleton and / or a polycarbonate-based urethane (meth)acrylate oligomer having a polycarbonate skeleton. In the present invention, a polyether-based urethane (meth)acrylate oligomer having a polyether skeleton is particularly preferred.

[0017] The polyether-based polyurethane (meth)acrylate oligomer is not particularly limited as long as it has one or more (meth)acryloyl groups in the molecule and has a plurality of polyether repeating units and polyurethane repeating units. The polycarbonate-based polyurethane (meth)acrylate oligomer is not particularly limited as long as it has one or more (meth)acryloyl groups in the molecule and has a plurality of polycarbonate repeating units and a plurality of polyurethane repeating units.

[0018] Polyether-based polyurethane (meth)acrylate oligomers can be synthesized, for example, by reacting a polyisocyanate component with a polyol component containing a polyether-based polyol to form an isocyanate group- or hydroxyl group-containing urethane prepolymer, and then reacting the isocyanate group- or hydroxyl group-containing urethane prepolymer with a compound having an active hydrogen-containing group and a (meth)acryloyl group in the molecule (hydroxyalkyl (meth)acrylate, (meth)acrylic acid, etc.) or a compound having an isocyanate group and a (meth)acryloyl group in the molecule, but are not limited to this method. In the present invention, preferred are those obtained by reacting a polyisocyanate component with a polyol component to form an isocyanate group-containing urethane prepolymer, and then reacting the isocyanate group-containing urethane prepolymer with a hydroxyl group-containing (meth)acrylate compound.

[0019] Polycarbonate-based polyurethane (meth)acrylate oligomers can be synthesized, for example, by reacting a polyisocyanate component with a polyol component containing a polycarbonate-based polyol to form an isocyanate group- or hydroxyl group-containing urethane prepolymer, and then reacting the isocyanate group- or hydroxyl group-containing urethane prepolymer with a compound having an active hydrogen-containing group and a (meth)acryloyl group in the molecule (hydroxyalkyl (meth)acrylate, (meth)acrylic acid, etc.) or a compound having an isocyanate group and a (meth)acryloyl group in the molecule, but are not limited to this method. In the present invention, preferred are those obtained by reacting a polyisocyanate component with a polyol component to form an isocyanate group-containing urethane prepolymer, and then reacting the isocyanate group-containing urethane prepolymer with a hydroxyl group-containing (meth)acrylate compound.

[0020] Examples of the polyisocyanate component used in producing the polyether-based polyurethane (meth)acrylate oligomer and the polycarbonate-based polyurethane (meth)acrylate oligomer include one or more selected from the group consisting of tolylene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate, phenylene diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, naphthalene diisocyanate, hexamethylene diisocyanate, 1,5-pentamethylene diisocyanate, isophorone diisocyanate, methylenebis(4-cyclohexyl isocyanate), trimethylhexamethylene diisocyanate, hydrogenated tolylene diisocyanate, dicyclohexylmethane diisocyanate, carbodiimide-modified polyisocyanates of these, and isocyanurate-modified polyisocyanates of these.

[0021] Examples of the polyether-based polyol used in producing the polyether-based polyurethane (meth)acrylate oligomer include one or more selected from the group consisting of polyalkylene polyols such as polyoxyethylene polyol, polyoxypropylene polyol, polyoxybutylene polyol, and poly(oxyethylene-oxypropylene) polyol. The polycarbonate polyol used in producing the polycarbonate-based polyurethane (meth)acrylate oligomer may be one or more compounds having a hydroxyl group at the end of the polycarbonate molecular chain.

[0022] Examples of polyol components other than polyether-based polyols and polycarbonate-based polyols that can be used in producing polyether-based polyurethane (meth)acrylate oligomers and polycarbonate-based polyurethane (meth)acrylate oligomers include one or more selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, co(polyethylene oxide-propylene oxide)diol, tetramethylene glycol, polytetramethylene glycol, bisphenol A, ethoxylated bisphenol A, caprolactone-modified polyols, carbonate polyols, polyester polyols, 1,6-hexanediol, trimethylolpropane, glycerin, pentaerythritol, dipentaerythritol, and the like.

[0023] Examples of the (meth)acrylate compound having a hydroxyl group used in producing the polyether-based polyurethane (meth)acrylate oligomer and the polycarbonate-based polyurethane (meth)acrylate oligomer include one or more compounds selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, polyethylene glycol mono(meth)acrylate, polypropylene glycol mono(meth)acrylate, tris(hydroxyethyl)isocyanuric acid di(meth)acrylate, pentaerythritol tri(meth)acrylate, and the like.

[0024] Examples of polyether-based polyurethane (meth)acrylate oligomers include those obtained by adding a (meth)acrylic compound having a hydroxyl group such as hydroxyethyl (meth)acrylate to an isocyanate group-containing polyether urethane prepolymer obtained by reacting a polyoxyalkylene polyol such as polyoxypropylene polyol with a polyisocyanate such as isophorone diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, or an isocyanurate or biuret product of these, and then subjecting the (meth)acrylic compound having a hydroxyl group to an addition reaction of 10% or more of the total number of isocyanate groups in the urethane prepolymer.

[0025] Examples of polycarbonate-based polyurethane (meth)acrylate oligomers include those obtained by adding a (meth)acrylic compound having a hydroxyl group such as hydroxyethyl (meth)acrylate to an isocyanate group-containing polyether urethane prepolymer obtained by reacting a polycarbonate polyol with a polyisocyanate such as isophorone diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, or an isocyanurate or biuret product of any of these, and then subjecting the (meth)acrylic compound having a hydroxyl group to an addition reaction of 10% or more of the total number of isocyanate groups in the urethane prepolymer.

[0026] The content of (A) urethane (meth)acrylate oligomer is not particularly limited. Taking the total amount of the curable artificial nail composition as 100% by mass, it can be, for example, 15.0% by mass or more, preferably 20.0% by mass or more, more preferably 30.0% by mass or more, and can be, for example, 70.0% by mass or less, preferably 65.0% by mass or less, more preferably 60.0% by mass or less. If it is less than 15.0% by mass, the viscosity may be too low, resulting in poor application properties, and the cured coating film may become too hard and brittle. If it exceeds 70.0% by mass, the viscosity may be too high, resulting in poor application properties.

[0027] [(B) Alicyclic monofunctional (meth)acrylate compound] The alicyclic monofunctional (meth)acrylate compound (B) contained in the curable artificial nail composition of the present invention is not particularly limited as long as it is a compound having one (meth)acryloyloxy group (CH═CHCOO— group or CH═C(CH)COO— group) and an alicyclic group in the molecule. The (B) alicyclic monofunctional (meth)acrylate compound has the effect of improving the curability while preventing the reaction rate of the curable artificial nail composition from becoming too high. Furthermore, it has the effect of optimizing the temperature rise during curing of the curable artificial nail composition, the release properties of the cured coating film of the curable artificial nail composition, the hardness of the cured coating film, and the elongation of the cured coating film.

[0028] Examples of the (B) alicyclic monofunctional (meth)acrylate compound include at least one selected from the group consisting of cycloalkyl (meth)acrylates having a cycloalkyl group of 3 to 10 carbon atoms, such as cyclopropyl (meth)acrylate, cyclobutyl (meth)acrylate, cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate, cycloheptyl (meth)acrylate, cyclooctyl (meth)acrylate, cyclononyl (meth)acrylate, and cyclodecyl (meth)acrylate; isobornyl (meth)acrylate, norbornyl (meth)acrylate, adamantyl (meth)acrylate, dicyclopentanyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, dicyclopentadiene methacrylate, dicyclopentenyl methacrylate, tricyclodecanyl (meth)acrylate, and tricyclodecanyloxyethyl (meth)acrylate. Among these, one or more selected from the group consisting of isobornyl (meth)acrylate, norbornyl (meth)acrylate, and cyclohexyl (meth)acrylate are preferred, with isobornyl (meth)acrylate being more preferred.

[0029] The content of the (B) alicyclic monofunctional (meth)acrylate compound is not particularly limited. For example, it can be 3.0% by mass or more and 25.0% by mass or less, based on 100% by mass of the total amount of the curable artificial nail composition. It is preferably 4.0% by mass or more, more preferably 5.0% by mass or more, and preferably 23.0% by mass or less, more preferably 20.0% by mass or less. If the (B) alicyclic monofunctional (meth)acrylate compound exceeds 25.0% by mass, the viscosity of the curable artificial nail composition may become too low, which may result in poor application properties, and the reactivity of the curable artificial nail composition may decrease, resulting in poor strength of the cured coating film. If the (B) alicyclic monofunctional (meth)acrylate compound is less than 3.0% by mass, the viscosity of the curable artificial nail composition may become too high, which may result in poor application properties, which may make it difficult to reduce the temperature rise during curing, resulting in poor strength of the cured coating film.

[0030] [(C) Hydroxyl group-containing (meth)acrylate compound] The hydroxyl group-containing (meth)acrylate compound (C) contained in the curable artificial nail composition of the present invention is not particularly limited as long as it is a compound having one (meth)acryloyloxy group (CH═CHCOO— group or CH═C(CH)COO— group) and a hydroxyl group in the molecule. The (C) hydroxyl group-containing (meth)acrylate compound has the effect of improving the curability while preventing the reaction rate of the curable artificial nail composition from becoming too high. Furthermore, it has the effect of optimizing the temperature rise during curing of the curable artificial nail composition, the release properties of the cured coating film of the curable artificial nail composition, the hardness of the cured coating film, and the elongation of the cured coating film.

[0031] Examples of the (C) hydroxyl group-containing (meth)acrylate compound include one or more selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, pentaerythritol mono(meth)acrylate, etc. Among these, one or more selected from the group consisting of 2-hydroxypropyl (meth)acrylate, 1-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate are more preferred, and 2-hydroxybutyl (meth)acrylate and / or 4-hydroxybutyl (meth)acrylate are even more preferred.

[0032] The content of the (C) hydroxyl group-containing (meth)acrylate compound is not particularly limited. For example, it is 5.0% by mass or more, preferably 10.0% by mass or more, more preferably 15.0% by mass or more, and for example, 47.0% by mass or less, preferably 40.0% by mass or less, more preferably 35.0% by mass or less, based on 100% by mass of the total amount of the curable artificial nail composition. If the content exceeds 47.0% by mass, the viscosity of the curable artificial nail composition may be reduced, resulting in reduced application workability (difficulty in application), the curing heat generated during curing of the curable artificial nail composition may be high, and the cured coating film may be prone to cracking. If the content is less than 5.0% by mass, the viscosity of the curable artificial nail composition may be increased, resulting in reduced application workability (difficulty in application), the curing of the curable artificial nail composition may take a long time, and uncured components may remain on the surface of the cured coating film.

[0033] The total content of the (B) alicyclic monofunctional (meth)acrylate compound and the (C) hydroxyl group-containing (meth)acrylate compound is not particularly limited, but can be, for example, 65.0 mass% or less, preferably 60.0 mass% or less, and more preferably 50.0 mass% or less, relative to 100 mass% of the total amount of the curable artificial nail composition.

[0034] [(D) Acylphosphine polymerization initiator] The acylphosphine polymerization initiator (D) contained in the curable artificial nail composition of the present invention generates radicals when energy is imparted thereto by irradiation with light (e.g., ultraviolet light) or heat, and is capable of initiating polymerization of components (A) to (C). There are no particular limitations on the initiator as long as it is a compound having an acylphosphine skeleton.

[0035] Acylphosphine oxide polymerization initiators generate radicals when irradiated with ultraviolet light having a wavelength of 365 to 405 nm, which is emitted from commonly used UV-LED light sources. Therefore, they can impart good curability to curable compositions even when cured by irradiation with light from various light sources, including UV-LED light sources. Furthermore, when cured by irradiation with light from a UV-LED light source, they can prevent yellowing of the cured coating film.

[0036] (D) Examples of the acylphosphine oxide polymerization initiator include one or more selected from the group consisting of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide, and 2,4,6-trimethylbenzoylethoxyphenylphosphine oxide. In the present invention, 2,4,6-trimethylbenzoyldiphenylphosphine oxide (OMNIRAD TPO) and 2,4,6-trimethylbenzoylethoxyphenylphosphine oxide are preferably used. 2,4,6-trimethylbenzoyldiphenylphosphine oxide is preferably used because it also functions as a skin conditioning agent.

[0037] The content of the (D) acylphosphine polymerization initiator is not particularly limited. It is, for example, 0.1% by mass or more, preferably 0.5% by mass or more, more preferably 0.8% by mass or more, and for example, 4.0% by mass or less, preferably 3.0% by mass or less, more preferably 2.0% by mass or less, based on 100% by mass of the total amount of the curable artificial nail composition. If the content of the (D) acylphosphine polymerization initiator exceeds 4.0% by mass, the cured coating film of the curable artificial nail composition may become brittle or may yellow. If the content of the (D) acylphosphine polymerization initiator is less than 0.1% by mass, the curing of the curable artificial nail composition may take a long time, resulting in poor curing and a high temperature rise during curing.

[0038] [(E) Polymerization initiators other than acylphosphine polymerization initiators] The polymerization initiator other than the acylphosphine-based polymerization initiator (E) contained in the curable artificial nail composition of the present invention is not particularly limited, as long as it is a polymerization initiator other than the acylphosphine-based polymerization initiator (E) that generates radicals or cations when given energy by irradiation with active energy rays (for example, light, ultraviolet light, infrared light, electron beams, radioactive rays (β rays, γ rays), etc.) or heat, and is capable of initiating polymerization of components (A) to (C). In the present invention, as the polymerization initiator other than the (E) acylphosphine-based polymerization initiator, a radical polymerization initiator that generates radicals when energy is applied thereto by irradiation with active energy rays or heat, for example, can be used. In the present invention, as the polymerization initiator other than the (E) acylphosphine-based polymerization initiator, a cationic polymerization initiator that generates cations when energy is applied thereto by irradiation with active energy rays or heat can be used. In the present invention, both radical polymerization initiators and cationic polymerization initiators can be used as the polymerization initiator other than the (E) acylphosphine-based polymerization initiator.

[0039] Examples of the radical polymerization initiator include one or more polymerization initiators selected from the group consisting of one or more α-hydroxyalkylphenone polymerization initiators, one or more benzoin ether polymerization initiators, one or more benzil ketal polymerization initiators, one or more acid ester polymerization initiators, one or more α-aminoalkylphenone polymerization initiators, one or more benzophenone polymerization initiators, one or more thioxanthone polymerization initiators, one or more titanocene polymerization initiators, one or more quinone polymerization initiators, one or more peroxide polymerization initiators, one or more azo polymerization initiators, and one or more persulfate polymerization initiators. The cationic polymerization initiator may include, for example, one or more of an ionic cationic polymerization initiator and / or a nonionic cationic initiator.

[0040] (E) Among the polymerization initiators other than the acylphosphine-based polymerization initiators, examples of radical polymerization initiators include 1-hydroxy-cyclohexyl-phenyl-ketone (OMNIRAD 184), 1-(4-(phenylthio)-2,2-(O-benzoyloxime))1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 1-[4-(2-hydroxyethoxy)phenyl]-2-hydroxy-2-methyl-propan-1-one, 2-hydroxy-1-{4-[4-(2-hydroxy-2-methylpropionyl)-benzyl]-phenyl}-2-methylpropan-1-one, 1-[4-(2-hydroxyethoxy)phenyl]-2-hydroxy-2-methyl-1-propan-1-one, thioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, 2-isopropylthioxanthone, 2-chlorothioxanthone Thioxanthone, 1-chloro-4-propylthioxanthone, 3-[3,4-dimethyl-9-oxo-9H-thioxanthone-2-yl-oxy]-2-hydroxypropyl-N,N,N-trimethylammonium chloride, fluorothioxanthone, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butan-1-one, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, oligo(2-hydroxy-2-methyl-1-(4-(1-methylvinyl)phenyl)propanone), 4-benzoyl-4'-methyl-diphenyl sulfide, 1,2-octanedione, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butan-1-one, 2,2-dimethoxy-1,2-Diphenylethan-1-one, 2-hydroxy-1-{4-[4-(2-hydroxy-2-methylpropionyl)-benzyl]phenyl}-2-methylpropane, isophthalphenone, methyl phenylglyoxylate, butylanthraquinone, ethylanthraquinone, phenanthrenequinone, camphorquinone, benzophenone, 4-phenylbenzophenone, benzoylbenzoic acid, hydroxybenzophenone, 4,4'-bis(diethylamino)benzophenone, benzoin, benzoin ethyl ether, benzoin isopropyl ether, benzoin Benzoin butyl ether, benzoin isobutyl ether, benzil dimethyl ketal, 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, 4-t-butyl-trichloroacetophenone, diethoxyacetophenone, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone, 2,2'-azobis(4-methoxy-2,4-dimethylvaleronitrile), 2,2'-azobis(2-amidinopropane) dihydrochloride, 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis Azobis(isobutyronitrile), 2,2'-azobis-2-methylbutyronitrile, 1,1-azobis(1-cyclohexanecarbonitrile), 2,2'-azobis(2-methylpropionitrile), 2,2'-azobis(2-cyclopropylpropionitrile), 2,2'-azobis(methyl isobutyrate), t-butyl hydroperoxide, cumene hydroperoxide, diacetyl peroxide, didecanoyl peroxide, di-t-butyl peroxide, methyl ethyl ketone peroxide, cyclohexanone peroxide, dicumyl Peroxide, di(3,5,5-trimethylhexanoyl) peroxide, 2,5-dimethylhexane-2,5-dihydroperoxide, dilauroyl peroxide, disuccinic acid peroxide, dibenzoyl peroxide, parachlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, t-butyl peroxypivalate, t-butyl peroxybenzoate, t-hexyl peroxide parethoxylate, 2,5-dimethyl-2,5-di(2-ethylhexanoylperoxy)hexane, 1,1,3,3-Tetramethylbutylperoxy-2-ethylhexanoate, t-hexylperoxy-2-ethylhexanoate, t-butylperoxy-2-ethylhexanoate, n-butyl-4,4-di(t-butylperoxy)valerate, 1,1-di(t-butylperoxy)cyclohexane, 1,1-di(t-hexylperoxy)cyclohexane, 2,2-bis(4,4-di-t-butylperoxycyclohexyl)propane, 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, 2 , 2-bis(t-butylperoxy)butane, 2,2-bis(t-butylperoxy)octane, dicetyl peroxydicarbonate, t-hexylperoxyisopropyl monocarbonate, diisopropyl peroxydicarbonate, t-butylperoxyisopropyl carbonate, di(4-t-butylcyclohexyl)peroxydicarbonate, di(2-ethylhexyl)peroxydicarbonate, potassium persulfate, sodium persulfate, ammonium persulfate, and the like.

[0041] Among the cationic polymerization initiators, examples of the ionic cationic polymerization initiator include salts consisting of a cationic moiety that absorbs active energy rays or heat and an anionic moiety that serves as a source of Lewis acid generation. The cationic moiety may be one or more selected from the group consisting of sulfonium, iodonium, diazonium, ammonium, pyridium, phosphonium, borate, selenium, gallate, oxonium, thioxanthonium, bromine salt, etc. Among these, the cationic moiety is preferably a cationic moiety having one to three aromatic rings, and examples thereof include aromatic sulfonium, aromatic iodonium, aromatic diazonium, aromatic ammonium, etc. Examples of the anion moiety include one or more selected from the group consisting of hexafluorophosphate, hexafluoroantimonate, tetrakis(pentafluorophenyl)borate, tetrafluoroborate, hexachloroantimonate, trifluoroacetate, trifluorophosphate, methanesulfonate, trifluoromethanesulfonate, tris(pentafluoroethyl)trifluorophosphate, toluenesulfonate, triflate, and the like.

[0042] The ionic cationic polymerization initiator may be at least one selected from the group consisting of sulfonium salts (particularly, aromatic sulfonium salts), iodonium salts (particularly, aromatic iodonium salts), diazonium salts (particularly, aromatic diazonium salts), ammonium salts, pyridinium salts, and phosphonium salts (particularly, aromatic phosphonium salts).

[0043] Examples of sulfonium salts include triphenylsulfonium hexafluorophosphate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium methanesulfonate, triphenylsulfonium trifluoromethanesulfonate, triphenylsulfonium trifluoroacetate, triphenylsulfonium tetrafluoroborate, triphenylsulfonium bromide, triphenylsulfonium tetrakis(pentafluorophenyl)borate, (4-hydroxyphenyl)methylbenzylsulfonium tetrakis(pentafluorophenyl)borate, (4-hydroxyphenyl)methylbenzylsulfonium hexafluorophosphate, (4-hydroxyphenyl)methylbenzylsulfonium hexafluoroantimonate, (4-hydroxyphenyl)dimethylsulfonium hexafluorophosphate, (4-hydroxyphenyl)dimethylsulfonium hexafluoroantimonate, (4-acetoxyphenyl)dimethylsulfonium hexafluorophosphate, and (4-acetoxyphenyl)dimethylsulfonium hexafluoroantimonate.

[0044] Examples of iodonium salts include one or more selected from the group consisting of phenyl-4-(2'-hydroxy-1'-tetradecaoxy)phenyliodonium trifluoromethanesulfonate, phenyl-4-(2'-hydroxy-1'-tetradecaoxy)phenyliodonium-p-toluenesulfonate, diphenyliodonium trifluoroacetate, diphenyliodonium hexafluorophosphate, diphenyliodonium hexafluoroantimonate, diphenyliodonium trifluoromethanesulfonate, diphenyliodonium tetrakis(pentafluorophenyl)borate, diphenyliodonium tetrafluoroborate, bis(4-t-butylphenyl)iodonium hexafluorophosphate, bis(4-t-butylphenyl)iodonium hexafluoroantimonate, bis(4-t-butylphenyl)iodonium trifluoromethanesulfonate, and bis(4-t-butylphenyl)iodonium tetrakis(pentafluorophenyl)borate.

[0045] Examples of the diazonium salt include one or more selected from the group consisting of phenyldiazonium hexafluorophosphate, phenyldiazonium hexafluoroantimonate, phenyldiazonium tetrafluoroborate, 4-nitrobenzenediazonium tetrafluoroborate, and the like.

[0046] Examples of the ammonium salt include one or more selected from the group consisting of tetramethylammonium butyltris(2,6-difluorophenyl)borate, tetramethylammonium hexyltris(p-chlorophenyl)borate, tetramethylammonium hexyltris(3-trifluoromethylphenyl)borate, benzyldimethylphenylammonium butyltris(2,6-difluorophenyl)borate, benzyldimethylphenylammonium hexyltris(p-chlorophenyl)borate, and benzyldimethylphenylammonium hexyltris(3-trifluoromethylphenyl)borate.

[0047] Examples of pyridinium salts include one or more selected from the group consisting of 1-benzyl-2-cyanopyridinium hexafluorophosphate, 1-benzyl-2-cyanopyridinium hexafluoroantimonate, 1-benzyl-2-cyanopyridinium tetrafluoroborate, N-(α-phenylbenzyl)-2-cyanopyridinium hexafluorophosphate, N-(α-phenylbenzyl)-2-cyanopyridinium hexafluoroantimonate, N-(α-naphthylmethyl)-2-cyanopyridinium hexafluorophosphate, N-(α-naphthylmethyl)-2-cyanopyridinium hexafluoroantimonate, N-benzyl-2-cyanopyridinium hexafluorophosphate, and N-benzyl-2-cyanopyridinium hexafluoroantimonate.

[0048] Examples of the phosphonium salt include one or more selected from the group consisting of tetraphenylphosphonium hexafluorophosphate, tetrafluorophosphonium hexafluoroantimonate, triphenyl(3,3-dicyano-2-propenyl)phosphonium hexafluorophosphate, triphenyl(3,3-dicyano-2-propenyl)phosphonium hexafluoroantimonate, triphenylmethoxyphosphonium hexafluorophosphate, triphenylmethoxyphosphonium hexafluoroantimonate, n-butoxytriphenylphosphonium hexafluorophosphate, and n-butoxytriphenylphosphonium hexafluoroantimonate.

[0049] Among the cationic polymerization initiators, examples of nonionic cationic polymerization initiators include one or more selected from the group consisting of trichloromethyl-1,3,5-triazine compounds, diazomethane compounds, imide sulfonate compounds, oxime sulfonate compounds, metallocene compounds, benzoin tosylate compounds, etc. As the nonionic cationic polymerization initiator, trichloromethyl-1,3,5-triazine compounds are preferred. Examples of the trichloromethyl-1,3,5-triazine compound include 2-(3-chlorophenyl)-4,6-bis(trichloromethyl)-1,3,5-triazine, 2-(4-methylthiophenyl)-4,6-bis(trichloromethyl)-1,3,5-triazine, 2-(3,4-dimethoxystyryl)-4,6-bis(trichloromethyl)-1,3,5-triazine, 2-(4-methoxyphenyl)-4,6-bis(trichloromethyl)-1,3,5-triazine, and 2-piperonyl-4,6-bis(trichloromethyl)

[0033] Examples of the 2-(4-methyl-2-furan-2-yl)ethenyl-4,6-bis(trichloromethyl)-1,3,5-triazine include one or more selected from the group consisting of 2-(4-methoxystyryl)-4,6-bis(trichloromethyl)-1,3,5-triazine, 2-[2-(5-methylfuran-2-yl)ethenyl]-4,6-bis(trichloromethyl)-1,3,5-triazine, 2-[2-(furan-2-yl)ethenyl]-4,6-bis(trichloromethyl)-1,3,5-triazine, and 2-(4-diethylamino-2-methylstyryl)-4,6-bis(trichloromethyl)-1,3,5-triazine.

[0050] The cationic polymerization initiator may be commercially available. For example, the San-Aid series (SI-60L, SI-80L, SI-100L, SI-110L, SI-150L, ​​SI-180L, SI-145, SI-160, SI-300, SI-360, etc.) manufactured by Sanshin Chemical Industry Co., Ltd., the Kayarad series (PCI-220, PCI-620, etc.) manufactured by Nippon Kayaku Co., Ltd., the Cyracure series (UVI-6990, UVI-6992, UVI-6970, UVI-6992, UVI-69 ... 74, UVI-6976, UVI-950, etc.), ADEKA Adeka Arcles series (SP-150, SP-170, SP-500, SP-172, SP-151, SP-171, CP-77, CP-66, etc.), Nippon Soda CI series (2481, 2624, 2639, 2734, 2758, 2823, 2855, 5102, etc.), Nippon Soda CIT series (1370, 1682, etc.), Nippon Soda CIP series (1866S, 2 048S, 2064S, etc.), Midori Chemical's DPI series (101, 102, 103, 105, 106, 109, 201, etc.), Midori Chemical's MPI series (103, 105, 106, 109, etc.), Midori Chemical's BBI series (101, 102, 103, 105, etc.), Midori Chemical's TPS series (101, 102, 103, 105, 106, 109, 300, 1000, etc.), Midori Chemical's MDS series (103, 105, 106, 109, 110, 201, 20 5, 209, 300, 301, etc.), DTS series (102, 103, 105, etc.), NAT series (103, etc.), NDS series (103, etc.), BDS series (109, etc.), MNPS series (109, etc.), HDS series (109, etc.), PHOTOINITIATOR series (2074, etc.) manufactured by Solvay Japan, CPI series (100P, 101A, 110P, 200K, etc.) manufactured by San-Apro, IGM Examples of the adhesive include one or more selected from the group consisting of the Omnicat series (250, 270, etc.) manufactured by Resins, Irgacure 290 manufactured by BASF, DAICAT II manufactured by Daicel, UVACURE series (1591, 1590, etc.) manufactured by Daicel-Allnex, CD series (1010, 1011, 1012, etc.) manufactured by Sartomer, and FFC509 manufactured by 3M.

[0051] In the curable artificial nail composition of the present invention, it is preferable to use a polymerization initiator that can generate radicals and initiate polymerization at ultraviolet wavelengths of around 405 nm and around 365 nm that are irradiated during curing. Since it is effective to use a polymerization initiator in combination with an acylphosphine oxide polymerization initiator, a polymerization initiator containing an α-hydroxyalkylphenone polymerization initiator may be used as the polymerization initiator other than the (E) acylphosphine polymerization initiator, or a polymerization initiator composition containing an acylphosphine oxide polymerization initiator and a peroxide polymerization initiator may also be used.

[0052] The content of the polymerization initiator other than the (E) acylphosphine-based polymerization initiator is not particularly limited. It is, for example, 0.5% by mass or more, preferably 1.0% by mass or more, more preferably 2.0% by mass or more, and for example, 10.0% by mass or less, preferably 7.0% by mass or less, more preferably 5.0% by mass or less, based on 100% by mass of the total amount of the curable artificial nail composition. If the content of the (E) polymerization initiator other than the acylphosphine-based polymerization initiator exceeds 10.0% by mass, the cured coating film of the curable artificial nail composition may become brittle. If the content of the (C) polymerization initiator is less than 0.5% by mass, the curing of the curable artificial nail composition may take a long time or may result in poor curing.

[0053] (E) The polymerization initiator other than the acylphosphine polymerization initiator preferably includes an α-hydroxyalkylphenone polymerization initiator. In this case, the content of the acylphosphine oxide polymerization initiator is, relative to 100% by mass of the total curable artificial nail composition, for example, 0.1% by mass or more, preferably 0.5% by mass or more, more preferably 0.8% by mass or more, and for example, 3.0% by mass or less, preferably 2.0% by mass or less, more preferably 1.7% by mass or less. Furthermore, the content of the α-hydroxyalkylphenone polymerization initiator is, relative to 100% by mass of the total curable artificial nail composition, for example, 1.0% by mass or more, preferably 2.0% by mass or more, more preferably 2.5% by mass or more, and for example, less than 7.0% by mass, preferably 5.0% by mass or less, more preferably 4.0% by mass or less. The total content of the acylphosphine oxide polymerization initiator and the α-hydroxyalkylphenone polymerization initiator is, for example, 1.1% by mass or more, preferably 2.0% by mass or more, more preferably 3.0% by mass or more, and even more preferably 4.0% by mass or more, and for example, 10.0% by mass or less, preferably 8.0% by mass or less, and more preferably 6.0% by mass or less.

[0054] When a peroxide-based polymerization initiator is used as the polymerization initiator other than the (E) acylphosphine-based polymerization initiator, the content of the peroxide-based polymerization initiator is preferably 8.0% by mass or less, and more preferably 7.0% by mass or less, based on 100% by mass of the total amount of the curable artificial nail composition. This makes it possible to appropriately adjust the polymerization rate of the curable artificial nail composition and suppress the temperature rise during curing. The lower limit of the content of the peroxide-based polymerization initiator can be 0% by mass, based on 100% by mass of the total amount of the curable artificial nail composition.

[0055] [(F) Inorganic filler] The inorganic filler (F) contained in the curable artificial nail composition of the present invention is a component that mainly imparts thixotropy to the curable artificial nail composition, adjusts leveling properties and flowability, and also has the function of adjusting the surface hardness, mechanical strength, surface roughness, gloss, etc. of the cured coating film of the curable artificial nail composition.

[0056] Examples of (F) inorganic fillers include one or more selected from the group consisting of silica, diatomaceous earth, clay, kaolinite, pyrophyllite, sericite, smectic, vermiculite, montmorillonite, Beidelite, nontronite, hectorite, talc, mica, zirconium oxide, zinc oxide, magnesium oxide, saponite, aluminum oxide, titanium oxide, silicon nitride, boron nitride, silicon carbide, calcium carbonate, calcium sulfate, barium sulfate, etc. Among these, preferably, one or more selected from the group consisting of silica, talc, mica, zirconium oxide, zinc oxide, magnesium oxide, aluminum oxide, titanium oxide, silicon nitride, boron nitride, silicon carbide, calcium carbonate, calcium sulfate, barium sulfate, more preferably, one or more selected from the group consisting of silica, zinc oxide, magnesium oxide, titanium oxide, calcium carbonate, calcium sulfate, and even more preferably, silica.

[0057] The shape, particle structure, particle size, etc. of the (F) inorganic filler are not particularly limited. The shape of the (F) inorganic filler may be, for example, spherical, approximately spherical, plate-like, fibrous, or amorphous. The particle structure of the (F) inorganic filler may be, for example, porous, non-porous, hollow, or agglomerated. The particle size of the (F) inorganic filler is, for example, a volume average primary particle size of 0.5 nm or more, preferably 1 nm or more, and for example, 500 μm or less, preferably 300 μm or less. For example, nano-sized inorganic fillers of 1.0 nm to 500 nm or less can be used, and micro-sized inorganic fillers of 0.5 μm to 300 μm or less can also be used. Preferably, inorganic fillers with a volume average particle size of 1.0 nm to 300 nm or less, more preferably 1.0 nm to 100 nm or less are used.

[0058] The (F) inorganic filler may be one whose surface has been at least partially treated. For example, it may be subjected to a hydrophobic treatment with a hydrophobic compound or a hydrophilic treatment with a hydrophilic compound. In the present invention, from the viewpoint of dispersibility in the curable artificial nail composition, it is preferable to use an inorganic filler whose surface has been at least partially treated for hydrophobization. As the inorganic filler having at least a portion of its surface hydrophobized, preferably, an alkylated inorganic filler having an alkyl group introduced at least a portion of its surface can be used, and more preferably, alkylsilylated silica having an alkyl group introduced at least a portion of its surface can be used. Examples of alkylsilylated silica include trialkylsilylated silica, dialkylsilylated silica, and monoalkylsilylated silica, and trialkylsilylated silica and / or dialkylsilylated silica is preferred, and dialkylsilylated silane is more preferred.

[0059] The alkyl group in alkylsilylated silica, particularly trialkylsilylated silica or dialkylsilylated silica, is an alkyl group having 1 to 24 carbon atoms, preferably an alkyl group having 1 to 12 carbon atoms, and is a linear, branched, or cyclic alkyl group. The multiple alkyl groups in the trialkylsilylated silyl and dialkylsilylated silyl may be the same or different. In the present invention, the alkyl group in the trialkylsilylated silyl and dialkylsilylated silyl is preferably a linear or branched alkyl group having 1 to 6 carbon atoms, more preferably a linear or branched alkyl group having 1 to 3 carbon atoms, and even more preferably a methyl group.

[0060] In the present invention, trialkylsilylated silica is silica whose surface has been treated with a trialkylsilylation agent (wherein the three alkyl groups may be the same or different and are linear, branched, or cyclic alkyl groups having 1 to 12 carbon atoms), and dialkylsilylated silica is silica whose surface has been treated with a dialkylsilylation agent (wherein the two alkyl groups may be the same or different and are linear, branched, or cyclic alkyl groups having 1 to 12 carbon atoms). There are no particular limitations on the trialkylsilylated silica and dialkylsilylated silica, as long as they can be used as components of cosmetics.

[0061] The alkylsilylation treatment of silica can be carried out using, for example, a silicone compound such as a reactive organosilane or organosilazane, for example, an alkyl halide silane or an alkylsilazane compound. Examples of silicone compounds used in the trialkylsilylation treatment include trialkylmonohalogenated silanes (e.g., chlorotrimethylsilane, chlorotriethylsilane, etc.) and hexaalkyldisilazanes (e.g., hexamethyldisilazane, hexaethyldisilazane, etc.). The trialkylsilylation treatment can be carried out so that the carbon content in the trialkylsilylated silane is, for example, 0.2 mass% or more, preferably 0.4 mass% or more, and for example, 7.0 mass% or less, preferably 5.0 mass% or less. Examples of silicone compounds used in the dialkylsilylation treatment include dialkyldihalogenated silanes (e.g., dichlorodimethylsilane, dichlorodiethylsilane, etc.). The dialkylsilylation treatment can be carried out so that the carbon content in the dialkylsilylated silane is, for example, 0.3 mass% or more, preferably 0.5 mass% or more, and for example, 7.0 mass% or less, preferably 4.5 mass% or less.

[0062] When trialkylsilylated silica and / or dialkylsilylated silica is used as the (F) inorganic filler, the volume average primary particle diameter of the trialkylsilylated silica and / or dialkylsilylated silica is not particularly limited. It can be appropriately determined from the viewpoints of the hydrophobicity of silica, dispersion stability in the curable artificial nail composition, etc. For example, it is 0.5 nm or more, preferably 1 nm or more, more preferably 5 nm or more, and for example, 500 nm or less, preferably 300 nm or less, more preferably 100 nm or less.

[0063] When trialkylsilylated silica and / or dialkylsilylated silica are used as the (F) inorganic filler, commercially available products may be used. The trialkylsilylated silica may be, for example, one or more selected from the group consisting of the AEROSIL series (RX 50, NAX 50, NX 90 G, NX 90 S, NX 130, RX 200, R 8200, RX 300, R 812, R 812 S) manufactured by Nippon Aerosil Co., Ltd., Cabosil TS-530 manufactured by Cabot Corporation, HDK H2000 manufactured by Wacker Asahi Kasei Silicones, and VM-2270 Aerogel Fine Particles manufactured by Dow Corning Toray Co., Ltd. As the dialkylsilylated silica, for example, one or more types selected from the group consisting of the AEROSIL series (R 972, R 974, R 9200, R 976, R 976 S) manufactured by Nippon Aerosil Co., Ltd., and HDK H15, HDK H18, HDK H20, HDK H 30 manufactured by Wacker Asahi Kasei Silicones Co., Ltd. can be used.

[0064] The content of the (F) inorganic filler is greater than 0% by mass and not more than 7.0% by mass based on 100% by mass of the total amount of the curable artificial nail composition. For example, it is 0.1% by mass or more, preferably 0.2% by mass or more, more preferably 0.3% by mass or more, and for example, 6.5% by mass or less, preferably 6.0% by mass or less, more preferably 5.0% by mass or less, and even more preferably 4.5% by mass or less. If the content of the (F) inorganic filler exceeds 7.0% by mass based on 100% by mass of the total amount of the curable artificial nail composition, the handleability and leveling properties of the curable artificial nail composition may be impaired, the viscosity of the curable artificial nail composition may increase, and the adhesiveness of the cured coating film of the curable artificial nail composition may be reduced. If the (F) inorganic filler is not included, it is difficult to impart sufficient thixotropy to the curable artificial nail composition, and the composition may flow after application, especially after thick coating.

[0065] [(G) (Meth)acrylamide compounds] The curable artificial nail composition of the present invention may contain (G) a (meth)acrylamide compound. The (G) (meth)acrylamide compound is not particularly limited as long as it is a compound having one or more acrylamide groups (CH═CHCON<group) or methacrylamide groups (CH═C(CH)CONH<group) in the molecule. The (G) (meth)acrylamide compound improves the reaction rate of the curable artificial nail composition and improves the adhesive strength of the cured coating film.

[0066] (G) Examples of the (meth)acrylamide compound include (meth)acrylamide, diacetone (meth)acrylamide, N-methyl (meth)acrylamide, N-ethyl (meth)acrylamide, N-methylol (meth)acrylamide, N-(2-hydroxyethyl) (meth)acrylamide, N-(3-hydroxypropyl) (meth)acrylamide, N-(2-hydroxypropyl) (meth)acrylamide, N-(4-hydroxybutyl) (meth)acrylamide, and N-methoxymethyl (meth)acrylamide. (meth)acrylamide, N-butoxymethyl (meth)acrylamide, N-isopropyl (meth)acrylamide, Nn-butoxymethyl (meth)acrylamide, N-isobutoxymethyl (meth)acrylamide, Nt-butyl (meth)acrylamide, N-acryloylmorpholine, N-(2-hydroxyethyl) (meth)acrylamide, N-(hydroxymethyl) (meth)acrylamide, N-[3-(dimethylamino)propyl] (meth)acrylamide, N-(1,1-dimethyl-3-oxo Butyl) (meth)acrylamide, 2-(meth)acrylamido-2-methylpropanesulfonic acid, Nt-butyl (meth)acrylamidosulfonic acid, N,N-dimethyl (meth)acrylamide, N,N-diethyl (meth)acrylamide, N,N-dipropyl (meth)acrylamide, N,N-diisopropyl (meth)acrylamide, N,N-dibutyl (meth)acrylamide, N,N-diisobutyl (meth)acrylamide, N,N-di-t-butyl (meth)acrylamide, N,N-diheptyl Examples thereof include one or more selected from the group consisting of (meth)acrylamide, N,N-dioctyl(meth)acrylamide, N,N-di-t-octyl(meth)acrylamide, N,N-didodecyl(meth)acrylamide, N,N-dioctadecyl(meth)acrylamide, N,N-dimethylaminopropyl(meth)acrylamide, N,N-dimethylaminoethyl(meth)acrylamide, N,N-dimethylaminopropyl(meth)acrylamide, and N,N'-methylenebis(meth)acrylamide. Of these, N,N-dimethylacrylamide and / or N-hydroxyethylacrylamide are preferred.

[0067] The content of the (G) (meth)acrylamide compound is not particularly limited. It can be, for example, 15.0% by mass or less, preferably 10.0% by mass or less, and for example, 0.5% by mass or more, preferably 1.0% by mass or more, based on 100% by mass of the total amount of the curable artificial nail composition. If the (G) (meth)acrylamide compound exceeds 15.0% by mass, the temperature rise during curing of the curable artificial nail composition may be too high, the water resistance and alcohol resistance of the cured coating film may be reduced, making it more prone to peeling, and there may be problems with a particular odor. If the content is less than 0.5% by mass, the reaction rate of the curable artificial nail composition may not be improved, and curing may take a long time and / or may not be complete.

[0068] [(H) Trifunctional or higher (meth)acrylate compounds] The curable artificial nail composition of the present invention may contain (H) a trifunctional or higher functional (meth)acrylate compound. (G) The trifunctional or higher functional (meth)acrylate compound is not particularly limited as long as it is a compound having three or more (meth)acrylate compounds in the molecule and is a compound other than (A), (C), and (G). (H) The tri- or higher functional (meth)acrylate compound improves the crosslink density of the cured coating film of the curable artificial nail composition, and imparts the effect of improving the durability of the cured coating film.

[0069] The (H) tri- or higher functional (meth)acrylate compound is preferably one or more selected from the group consisting of tri- or higher functional (meth)acrylate monomers and (A) tri- or higher functional acrylate oligomers other than urethane (meth)acrylate oligomers, and among these, tri- or higher functional (meth)acrylate monomers are more preferred. (H) The tri- or higher functional (meth)acrylate compound preferably has a molecular weight (weight average molecular weight) of less than 1,000. In the (H) tri- or higher functional (meth)acrylate compound, the number of (meth)acryloyl groups in the molecule is not particularly limited as long as it is 3 or more, but from the viewpoints of the curability of the curable artificial nail composition, the hardness of the cured coating film, etc., it is 3 or more and 10 or less, preferably 3 or more and 8 or less, and more preferably 3 or more and 6 or less.

[0070] Examples of trifunctional or higher (meth)acrylate monomers include trimethylolpropane tri(meth)acrylate (trimethylolpropane triacrylate alone, trimethylolpropane trimethacrylate alone, or a mixture of trimethylolpropane triacrylate and trimethylolpropane trimethacrylate); polypentaerythritol octa(meth)acrylate (polypentaerythritol octa(meth)acrylate, an ester of a hydroxyl group of a pentaerythritol polymer having eight (meth)acrylate groups with (meth)acrylic acid (for example, "tripentaerythritol acrylate, a mixture of mono- and dipentaerythritol acrylate, and polypentaerythritol acrylate" (manufactured by Osaka Organic Chemical Industry Ltd., "Viscoat #802, TriPEA")); glycerin tri(meth)acrylate, ditrimethylolpropane tri(meth)acrylate, pentaerythritol octa(meth)acrylate, Examples of the monomer include at least one selected from the group consisting of tri(meth)acrylate monomers such as thritol tri(meth)acrylate and ε-caprolactone-modified tris(acryloxyethyl)isocyanurate; tetra(meth)acrylate monomers such as pentaerythritol tetra(meth)acrylate and dipentaerythritol tetra(meth)acrylate; polypentaerythritol poly(meth)acrylates such as dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, tripentaerythritol hexa(meth)acrylate and tetrapentaerythritol hexa(meth)acrylate; and (meth)acrylate monomers having four or more (meth)acrylate groups such as isocyanuric acid tri(meth)acrylate, triazine tri(meth)acrylate, ethoxylated isocyanuric acid triacrylate and ethoxylated pentaerythritol tetraacrylate. Of these, trimethylolpropane tri(meth)acrylate is preferred, and trimethylolpropane trimethacrylate is more preferred.

[0071] The content of the trifunctional or higher functional (meth)acrylate compound (H) is not particularly limited and can be, for example, 15.0% by mass or less, preferably 10.0% by mass or less, and can be, for example, 0.5% by mass or more, preferably 1.0% by mass or more, relative to 100% by mass of the total amount of the curable artificial nail composition. If the content of the (H) trifunctional or higher (meth)acrylate compound exceeds 15.0% by mass, the curable artificial nail composition may have too high a temperature rise during curing, the cured coating film may become too hard and lose flexibility, resulting in poor conformability to the nail and resulting in lifting or chipping, or a distinctive odor problem. If the amount of the tri- or higher functional (meth)acrylate compound (H) is less than 0.5% by mass, the reaction rate of the curable artificial nail composition cannot be improved, and curing may take a long time and / or may not be complete.

[0072] [(I) Radically polymerizable compound having a phosphate group] The curable artificial nail composition of the present invention may contain (I) a radical polymerizable compound having a phosphate group. (I) The radical polymerizable compound having a phosphate group is a compound having a phosphate group ((-) n P(=O)(OH) 3-n There are no particular limitations on the compound as long as it has a radical polymerizable group (n is an integer of 1 to 3, and (-) is a bond to a phosphorus atom). The radical polymerizable group is not particularly limited, and examples thereof include ethylenically unsaturated groups, such as an acryloyl group, a methacryloyl group, a vinyl group, a vinyl ether group, and an allyl group.

[0073] In the present invention, the (I) radical polymerizable compound having a phosphoric acid group is preferably a (meth)acrylate compound having a phosphoric acid group. Examples of the (A) radical polymerizable compound having a phosphoric acid group include compounds represented by the following formula: (CH2=CR 11 -COO-R 12 -) n P(=O)(OH) 3-n (R in the formula 11 is hydrogen or a methyl group, and R 11When there are multiple R, they may be the same or different. 12 is a divalent organic group, and R 12 When there are a plurality of groups, they may be the same or different. n is an integer of 1 to 3. The compound may be one or more selected from the group consisting of compounds represented by the following formula:

[0074] Examples of such (meth)acrylate compounds having a phosphate group include 2-(meth)acryloyloxyethyl phosphate, 2-(meth)acryloyloxypropyl phosphate, 3-(meth)acryloyloxypropyl phosphate, 2-(meth)acryloyloxybutyl phosphate, 4-(meth)acryloyloxybutyl phosphate, 2-(meth)acryloyloxypentyl phosphate, 5-(meth)acryloyloxypentyl phosphate, 2-(meth)acryloyloxyhexyl phosphate, 6-(meth)acryloyloxyhexyl phosphate, (2-( (meth)acryloyloxyethyl caprolactone), (meth)acryloyloxyethyl valerate phosphate, (meth)acryloyloxypropyl valerate, (meth)acryloyloxybutyl valerate phosphate, (meth)acryloyloxypentyl valerate, (meth)acryloyloxyhexyl valerate, (meth)acryloyloxyethyl caproate phosphate, (meth)acryloyloxypropyl caproate phosphate, (meth)acryloyloxybutyl caproate phosphate, (meth)acryloyloxypentyl caproate, phosphorus (Meth)acryloyloxyhexyl caproate, (meth)acryloyloxyethyl caprylate phosphate, (meth)acryloyloxypropyl caprylate phosphate, (meth)acryloyloxybutyl caprylate phosphate, (meth)acryloyloxypentyl caprylate, (meth)acryloyloxyhexyl caprylate phosphate, bis(2-(meth)acryloyloxyethyl) phosphate, bis(2-(meth)acryloyloxypropyl) phosphate, bis(3-(meth)acryloyloxypropyl) phosphate, bis(2-(meth)acryloyloxypropyl) phosphate acryloyloxybutyl), bis(4-(meth)acryloyloxybutyl) phosphate, bis(2-(meth)acryloyloxypentyl) phosphate, bis(5-(meth)acryloyloxypentyl) phosphate, bis(2-(meth)acryloyloxyhexyl) phosphate, bis(6-(meth)acryloyloxyhexyl) phosphate, bis(2-(meth)acryloyloxyethylcaprolactone) phosphate, phosphate esters of polyethylene glycol monoacrylate (acid phosphooxypolyoxyethylene glycol mono(meth)acrylate, etc.),Examples of the phosphate ester include one or more selected from the group consisting of phosphate esters of polypropylene glycol monomethacrylate (such as acid phosphooxy polyoxypropylene glycol mono(meth)acrylate), ethylene oxide-modified phosphate mono(meth)acrylate, ethylene oxide-modified phosphate di(meth)acrylate, propylene oxide-modified phosphate mono(meth)acrylate, propylene oxide-modified phosphate di(meth)acrylate, phosphate-modified epoxy(meth)acrylate, caprolactone-modified phosphate mono(meth)acrylate, caprolactone-modified phosphate di(meth)acrylate, tris(2-(meth)acryloyloxyethyl) phosphate, caprolactone-modified (meth)acryloyloxyethyl phosphate, ethyl (meth)acrylic acid hexanoate phosphate, pentyl (meth)acrylic acid propanoate phosphate, caprolactone-modified di(meth)acryloyloxyethyl phosphate, ethyl di(meth)acrylic acid hexanoate phosphate, pentyl di(meth)acrylic acid propanoate phosphate, and the like.

[0075] (I) The radical polymerizable compound having a phosphate group may be a commercially available product, such as one or more selected from the group consisting of the "Light Acrylate" series (P-1A(N) and the like) manufactured by Kyoeisha Chemical Co., Ltd., the "Light Ester" series (P-1M, P-2M and the like) manufactured by Kyoeisha Chemical Co., Ltd., the "Hosmer" series (M, PE, MH, PP and the like) manufactured by Unichemical Co., Ltd., the "KAYAMER" series (PM2, PM-21 and the like) manufactured by Nippon Kayaku Co., Ltd., and the "EBECRYL" series (168, 170, KRM8762 and the like) manufactured by Daicel-Allnex Corporation.

[0076] The content of the (I) radically polymerizable compound having a phosphate group is not particularly limited. It is, for example, 0.1% by mass or more, preferably 0.5% by mass or more, more preferably 0.8% by mass or more, and for example, 10.0% by mass or less, preferably 7.0% by mass or less, more preferably 4.0% by mass or less, based on 100% by mass of the total amount of the curable artificial nail composition. If the content of the (A) radically polymerizable compound having a phosphate group exceeds 10.0% by mass, the cured coating film of the curable artificial nail composition may become cloudy over time and / or the cured coating film may fade over time. If the content of the (I) radically polymerizable compound having a phosphate group is less than 0.1% by mass, the adhesiveness of the curable artificial nail composition may be insufficient.

[0077] [(J) Other ingredients] The curable artificial nail composition of the present invention may contain various components as “(J) other components” in addition to the essential components (A) to (F) and optional components (G) to (I), within the scope of not adversely affecting the storage stability, curability, viscosity, handleability, coatability, etc. of the curable artificial nail composition, or the color tone, durability, adhesion, etc. of the cured coating film. Examples of (J) other components include one or more selected from the group consisting of various additives such as radical polymerizable compounds other than (A) to (C) and (G) to (I), resins, polyfunctional thiol compounds, colorants, polyol compounds, solvents, plasticizers, fragrances, polymerization inhibitors, silicone-based and fluorine-based antifoaming agents, silane coupling agents such as γ-glycidoxypropyltrimethoxysilane, polymerization accelerators such as tertiary amines, 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.

[0078] <Radical polymerizable compounds other than (A) to (C) and (G) to (I)> The radical polymerizable compound other than (A) to (C) and (G) to (I) is not particularly limited as long as it is, for example, a radical polymerizable oligomer other than (A) or a radical polymerizable monomer other than (B), (C), and (G) to (I).

[0079] Examples of the radically polymerizable oligomer other than (A) include one or more selected from the group consisting of epoxy (meth)acrylate oligomers having molecular chains generated by a ring-opening reaction of an epoxy group, ester (meth)acrylate oligomers ((meth)acrylate oligomers having an ester bond in the main skeleton), ether (meth)acrylate oligomers ((meth)acrylate oligomers having an ether bond in the main skeleton), vinyl group-containing oligomers, and allyl group-containing oligomers.

[0080] Examples of the radical polymerizable monomer other than (B), (C), and (G) to (I) include one or more selected from the group consisting of vinyl group-containing monomers, allyl group-containing monomers, and acrylate monomers other than (B), (C), and (G) to (I).

[0081] Examples of the vinyl group-containing monomer compound and the allyl group-containing monomer include one or more selected from the group consisting of styrene, α-methylstyrene, vinyltoluene, α-chlorostyrene, 4-hydroxystyrene, 3-hydroxystyrene, vinyl acetate, vinyl propionate, methyl vinyl ether, ethyl vinyl ether, N-vinylpyrrolidone, vinylpyridine, and allyl glycidyl ether.

[0082] Examples of acrylate monomers other than (B), (C), and (G) to (I) include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, neopentyl (meth)acrylate, phenyl (meth)acrylate, and benzyl (meth)acrylate. Esters of monohydric alcohols such as (meth)acrylic acid and N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, Nt-butylaminoethyl (meth)acrylate, and other nitrogen-containing alkyl (meth)acrylates; glycidyl (meth)acrylate, 4-(meth)acryloyloxymethyl-2-cyclohexyl-1,3-dioxolane, (2-methyl-2-ethyl-1,3-dioxolan-4-yl)methyl (meth)acrylate acrylate, cyclic trimethylolpropane formal (meth)acrylate, (2-isobutyl-2-methyl-1,3-dioxolan-4-yl)methyl (meth)acrylate, (2-methyl-2-methyl-1,3-dioxolan-4-yl)methyl (meth)acrylate, (1,4-dioxaspiro[4,5]decan-2-yl)methyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, tetrafurfuryl alcohol oligo(meth)acrylate, alco heterocycle-containing (meth)acrylates such as hydroxylated tetrahydrofurfuryl (meth)acrylate, (3-ethyloxetan-3-yl)methyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate glycidyl ether, (meth)acryloylmorpholine, N-(meth)acryloyloxyethylhexahydrophthalimide, pentamethylpiperidyl (meth)acrylate, N-(meth)acryloxysuccinimide, and N-(meth)acryloxyphthalimide;Ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, polypropylene di(meth)acrylate, ethoxylated polypropylene glycol di(meth)acrylate, ethoxylated propylene glycol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, glycerin di(meth)acrylate, Examples of the di(meth)acrylate include one or more selected from the group consisting of trimethylolpropane di(meth)acrylate, pentaerythritol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, ethoxylated bisphenol A di(meth)acrylate, propoxylated bisphenol A di(meth)acrylate, isopyridenediphenylbis(oxyhydroxypropyl methacrylate), isocyanuric acid di(meth)acrylate, and propoxylated ethoxylated bisphenol A di(meth)acrylate. In terms of the curability of the curable artificial nail composition and the coating strength of the cured coating film, the content of the Si-containing radical polymerizable compound, particularly the Si-containing (meth)acrylate compound, in the curable artificial nail composition of the present invention is preferably less than 1 mass %, and more preferably less than 0.1 mass %, relative to 100 mass % of the total amount of the curable artificial nail composition. The lower limit of the content of the Si-containing radical polymerizable compound, particularly the Si-containing (meth)acrylate compound, can be 0 mass % relative to 100 mass % of the total amount of the curable artificial nail composition.

[0083] <Resin> The resin is not particularly limited as long as it is a resin that is neither polymerizable nor a polyol compound, and examples thereof include one or more resins selected from the group consisting of polyurethane resins, polyester resins, polyamide resins, polyether resins, olefin resins, aromatic hydrocarbon resins, acrylic resins, vinyl chloride resins, vinyl acetate resins, polyvinyl alcohol resins, polyvinyl acetal resins, core-shell polymers, graft resins, and block resins. In the curable artificial nail composition of the present invention, from the viewpoint of the curability of the curable artificial nail composition and the coating strength of the cured coating film, the content of the resin, particularly the polyurethane-based resin, is preferably 25% by mass or less, and more preferably 20% by mass or less, relative to 100% by mass of the total amount of the curable artificial nail composition. The lower limit of the content of the resin, particularly the polyurethane-based resin, can be 0% by mass, relative to 100% by mass of the total amount of the curable artificial nail composition.

[0084] <Multifunctional thiol compounds> The polyfunctional thiol compound that may be contained in the curable artificial nail composition of the present invention is not particularly limited as long as it is a compound having two or more thiol groups in the molecule. The polyfunctional thiol compound is blended as a chain transfer agent, a curability modifier, a crosslinking agent, and a viscosity modifier for the curable artificial nail composition. Examples of polyfunctional thiol compounds include those obtained by reacting a compound having a thiol group or a group that becomes a thiol group upon reaction with a hydroxyl group of a polyol compound such as trimethylolpropane, pentaerythritol, dipentaerythritol, or ethylene glycol. Among these, trifunctional or tetrafunctional thiol compounds are preferred, and one or more selected from the group consisting of trimethylolpropane tris(3-mercaptopropionate), trimethylolpropane tristhioglycolate, trimethylolpropane tris(3-mercaptobutyrate), pentaerythritol tetrakisthioglycolate, pentaerythritol tetrakis(3-mercaptobutyrate), and pentaerythritol tetrakis(3-mercaptopropionate) are preferred. In the curable artificial nail composition of the present invention, the content of the polyfunctional thiol compound is preferably less than 1.0% by mass, and more preferably less than 0.1% by mass, based on 100% by mass of the total amount of the curable artificial nail composition, from the viewpoints of the curability of the curable artificial nail composition, the coating film strength of the cured coating film, the working environment (prevention of offensive odors), etc. The lower limit of the content of the polyfunctional thiol compound can be 0% by mass, based on 100% by mass of the total amount of the curable artificial nail composition.

[0085] <Polymerization inhibitor> The polymerization inhibitor is not particularly limited as long as it is a compound capable of inhibiting the polymerization of the (meth)acrylate compounds (A) and (B). For example, it may be one or more compounds 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, and phenothiazine-based compounds. Among these, it is preferable to use tocopherol-based compounds and / or quinone-based compounds.

[0086] <Coloring agent> The colorant may be one or more selected from the group consisting of pigments, dyes, and luster materials, and may be used in any amount to impart a desired color tone to the curable artificial nail composition. In particular, the colorant may be one or more selected from the group consisting of inorganic pigments, organic pigments, and dyes used in nail coatings, and does not significantly inhibit curing by ultraviolet irradiation (light irradiation) or the like. Before curing, the curable artificial nail composition may contain not only pigments but also resin particles and decorative materials that can be incorporated into known curable artificial nail compositions. The curable artificial nail composition of the present invention preferably does not contain a luster material from the viewpoints of the adhesiveness of the cured coating film of the curable artificial nail composition, the coating strength of the cured coating film, and the like.

[0087] The curable artificial nail composition of the present invention preferably contains a bluing agent to form a transparent cured coating film and prevent the cured coating film from yellowing. The bluing agent used in the present invention preferably contains a blue colorant and a reactive diluent. Examples of blue colorants include colorants containing one or more selected from the group consisting of Violet 201, Violet 401, Blue 1, Blue 2, Blue 201, Blue 202, Blue 203, Blue 204, Blue 205, Blue 403, Blue 404, Green 201, Green 202, Green 204, Green 205, Green 3, Green 401, and Green 402, and preferably colorants containing one or more selected from the group consisting of Violet 201, Violet 401, Blue 1, Blue 2, Blue 201, Blue 202, Blue 203, Blue 204, Blue 205, Blue 403, and Blue 404. Examples of reactive diluents include one or more selected from the group consisting of (B) (meth)acrylate monomers.

[0088] <Polyol compounds> The polyol compound functions as a diluent and an adhesion improver for the curable artificial nail composition. Examples of the polyol compound include one or more selected from the group consisting of alkyl polyols, polyester polyols, polyether polyols, acrylic polyols, polybutadiene polyols, phenolic polyols, polycarbonate polyols, etc. Among these, alkyl polyols, polyester polyols, and polyether polyols are preferred. In the curable artificial nail composition of the present invention, the content of the polyol compound is preferably less than 10.0% by mass, and more preferably less than 5.0% by mass, based on 100% by mass of the total amount of the curable artificial nail composition, from the viewpoints of the curability of the curable artificial nail composition, the handleability of the curable artificial nail composition, the coating strength of the cured coating film, the adhesiveness of the cured coating film, etc. The lower limit of the content of the plasticizer can be 0% by mass, based on 100% by mass of the total amount of the curable artificial nail composition.

[0089] <Solvent> The solvent is not particularly limited as long as it can adjust the viscosity at the time of application by dilution. For example, one or more solvents selected from the group consisting of alcohols such as methanol, ethanol, propanol, n-butanol, and i-butanol; ketones such as acetone, methyl isobutyl ketone, methyl ethyl ketone, and cyclohexanone; cellosolves such as ethyl cellosolve; aromatic hydrocarbons such as toluene and xylene; glycol ethers such as propylene glycol monomethyl ether; acetates such as methyl acetate, ethyl acetate, and butyl acetate; and diacetone alcohol. The curable artificial nail composition of the present invention preferably does not contain a solvent from the viewpoints of the adhesiveness of the cured coating film of the curable artificial nail composition, the coating strength of the cured coating film, the working environment, and the like.

[0090] <Plasticizer> The plasticizer is not particularly limited as long as it imparts plasticity to the cured coating film of the curable artificial nail composition. Examples thereof include one or more selected from the group consisting of carboxylic acid ester compounds (phthalic acid esters, alkylene glycol dibenzoates, etc.), alkylphenol resins, butadiene resins (carboxylic acid-modified polybutadienes, carboxylic acid anhydride-modified polybutadienes, etc.), polyether resins (polyalkylene glycol compounds, polyol alkylene oxide adducts, polyamine alkylene oxide adducts, etc.), rosin, and rosin derivatives. In the curable artificial nail composition of the present invention, from the viewpoints of the curability of the curable artificial nail composition, the handleability of the curable artificial nail composition, the film strength of the cured coating film, the adhesiveness of the cured coating film, etc., the plasticizer content is preferably less than 10.0% by mass, and preferably less than 5.0% by mass, relative to 100% by mass of the total amount of the curable artificial nail composition. In particular, in the case of rosin or a rosin derivative, the plasticizer content is preferably less than 1.0% by mass, and preferably less than 0.5% by mass, relative to 100% by mass of the total amount of the curable artificial nail composition. The lower limit of the plasticizer content can be 0% by mass, relative to 100% by mass of the total amount of the curable artificial nail composition.

[0091] [Viscosity of Curable Artificial Nail Composition] The viscosity of the curable artificial nail composition of the present invention at 25°C can be, for example, from 0.1 Pa·s to 60.0 Pa·s. The viscosity is preferably 0.5 Pa·s or more, more preferably 0.7 Pa·s or more, and is preferably 55.0 Pa·s or less, more preferably 50.0 Pa·s or less. By achieving a viscosity within this range, a curable artificial nail composition can be obtained that is easy to apply with an applicator such as a brush or inkjet printer.

[0092] [Uses of the curable artificial nail composition] The curable artificial nail composition of the present invention is a composition for coating the surface of nails, similar to so-called common manicures and pedicures. The curable artificial nail composition of the present invention is particularly suitable for use as a gel nail. For example, it can be used to form any of a base coat layer applied directly to the user's nail, a color coat layer applied on top of the base coat layer, and a top coat layer (color top coat layer or clear top coat layer) applied on top of that. Examples include a color coat layer imparted with a desired color tone, a color top coat layer imparted with a desired color tone, a clear top coat layer that may also be imparted with a desired color tone, and a glitter-containing clear top coat layer containing a glittering material (metal powder, metal flakes, metal oxide flakes, glass flakes, etc.). After applying the curable artificial nail composition of the present invention, small decorations or powders can be attached to the coating surface of the curable artificial nail composition before curing to enhance the design.

[0093] The curable artificial nail composition of the present invention has good handleability, a coating film of the curable artificial nail composition has excellent leveling, is less likely to develop fluidity, and the cured coating film has excellent adhesion, and therefore can be suitably used as a curable artificial nail composition for forming a base coat layer in a gel nail.

[0094] [Coating of nails with curable artificial nail composition] The nails to be coated with the curable artificial nail composition of the present invention may be human fingernails or toenails, or may be the nails of animals such as dogs and cats. Furthermore, they may be artificial nails such as nail tips (false nails). When the curable artificial nail composition of the present invention is applied to a nail or an (un)cured coating film on the nail to form a coating, the applied surface may or may not be sanded. The method for applying the curable artificial nail composition is not particularly limited, and for example, an application tool such as a brush or an application method such as an inkjet can be used. The curable artificial nail composition of the present invention can also be suitably used as a curable artificial nail composition for forming a base layer in a fill-in type gel nail. In this case, when changing to a new gel nail, the base gel is left behind without removing the entire gel nail, and the upper layer of the base gel is sanded with a sanding machine, and a new gel nail is then applied on top of that, thereby forming a new gel nail.

[0095] An uncured coating film layer having the shape of a nail or the like can be formed on at least one surface of a sheet using the curable artificial nail composition of the present invention, and after contacting (transferring) this layer with the nail surface, the layer can be cured by irradiating with ultraviolet light, with or without peeling off the sheet. By using a method in which an uncured coating film layer is first formed on the surface of a sheet using a curable artificial nail composition and then transferred, it is possible to coat the nail surface with a uniform and accurate pattern without using an applicator such as a brush, and there is no need to clean the applicator after use.

[0096] [Means for curing the curable artificial nail composition] The means for curing the curable artificial nail composition is not particularly limited as long as it is a means capable of applying energy to cause curing of the curable artificial nail composition applied to a substrate such as a nail or nail tip. Examples include irradiation with energy rays such as light (ultraviolet (UV) rays, etc.), electron beams, and heat. Curing by irradiation with ultraviolet (UV) rays is particularly preferred because it can be carried out relatively quickly and easily. When curing by irradiation with light such as UV rays, a known UV curing device is used. Although the amount of energy required for curing varies depending on the composition of the curable artificial nail composition, for example, when curing by irradiation with light such as UV rays, the irradiation energy (integral light amount) by light irradiation is, for example, 5 mJ / cm. 2 or more, preferably 10 mJ / cm 2 or more, for example, 1000 mJ / cm 2 Less than or equal to 800 mJ / cm 2 If the irradiation energy is within this range, nail art having sufficient adhesion and abrasion resistance can be obtained.

[0097] Examples of light sources that can be used for irradiating light include known ultraviolet light sources such as multi-type UV lamps (UV+LEDs), mercury lamps, metal halide lamps, ultraviolet light-emitting diodes (UV-LEDs), and ultraviolet laser diodes (UV-LDs). Among these, from the viewpoints of compact size, long life, high efficiency, and low cost, multi-type lamps (UV+LEDs) (three-line dominant wavelength: about 365 nm, about 405 nm, and about 436 nm), ultraviolet light-emitting diodes (UV-LEDs; wavelength: about 385 nm to about 415 nm; peak wavelength: about 405 nm), and ultraviolet laser diodes (UV-LDs) are preferred. [Example]

[0098] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, "%" means "% by mass" and "parts" means "parts by mass." The blending amounts in Table 1 are in parts by mass.

[0099] [Examples 1 to 8, Comparative Examples 1 to 6] The components shown in Table 1 were placed in a container in the amounts (parts by mass) shown in Table 1, and the mixture was heated to 50°C while stirring with a dissolver. The mixture was degassed for 10 minutes under a pressure of 0.1 MPa while stirring, and then left to stand at 50° C. for 2 hours to further degas, yielding a curable artificial nail composition. All of these steps were performed in the dark.

[0100] <Ingredients> The components in Table 1 are as follows: PUA1: Difunctional polycarbonate-based polyurethane (meth)acrylate (weight average molecular weight 22,000) PUA2: Difunctional polyether polyurethane (meth)acrylate (weight average molecular weight 23,000) IBXA: Isobornyl acrylate IBXMA: Isobornyl methacrylate HBMA: 2-hydroxybutyl methacrylate TPO: 2,4,6-trimethylbenzoyldiphenylphosphine oxide MeSiO2: Silica dimethyl silylate HCHPK: 1-hydroxycyclohexyl phenyl ketone DMAA: Dimethylacrylamide TMPTMA: Trimethylolpropane trimethacrylate PMA: a mixture containing 2-acryloyloxyethyl phosphate and bis(2-acryloyloxyethyl) phosphate

[0101] <Handling evaluation> About 0.3 g of the obtained curable artificial nail composition was scooped up from the container with a brush and applied to a nail tip. The handleability was evaluated according to the following (a) to (c): (a) When scooping the curable artificial nail composition from the container onto a brush, is it possible to easily scoop up an appropriate amount? (b) Whether the curable artificial nail composition on the brush can be easily transferred from the brush to the tip; (c) After application, whether the coating film of the curable artificial nail composition flows on the tip, The handling was evaluated from the viewpoint of the following criteria, with A and B being acceptable and C being unacceptable. A: An appropriate amount of the curable artificial nail composition can be easily scooped up and placed on the brush, and can be easily transferred from the brush to the tip, and the coating does not flow on the tip. B: An appropriate amount of the curable artificial nail composition can be scooped up and placed on a brush, and can be transferred from the brush to the tip, with no or only slight flow of the coating film on the tip. C: It is difficult to scoop up the curable artificial nail composition into the brush in an appropriate amount and to transfer it from the brush to the tip, or it is difficult to scoop up the curable artificial nail composition into the brush in an appropriate amount and the coating flows on the tip.

[0102] <Leveling evaluation> Approximately 0.3 g of the obtained curable artificial nail composition was scooped up from the container with a brush and applied to the nail. After that, it was visually observed within 1 minute whether the written marks (application streaks) disappeared and evaluated according to the following criteria: A is pass, and C is fail. (evaluation) A: The handwriting (application streaks) has disappeared and cannot be confirmed. C: The handwriting (applied streaks) did not disappear and remained on the coating film.

[0103] <Liquidity evaluation> Approximately 0.3 g of the obtained curable artificial nail composition was scooped up from the container with a brush and applied to the nail. After that, it was visually observed whether the coating film flowed within 3 minutes and evaluated according to the following criteria: A is pass, and C is fail. (evaluation) A: No flow of the coating film was observed. C: Flow of the coating film is observed.

[0104] <Adhesion evaluation> The adhesiveness of the obtained curable artificial nail compositions was evaluated based on the peel-off load according to the following criteria. A and B are pass, and C is fail. Examples 1 to 4 are compared with Comparative Example 1, and Examples 5 to 8 are compared with Comparative Example 2. (evaluation) A: Compared with Comparative Example 1 or 2, the increase in 90° peel-off load is 0.10 kg or more. B: Compared with Comparative Example 1 or 2, the increase in 90° peel-off load is 0.05 kg or more and less than 0.10 kg. C: Compared to Comparative Example 1 or 2, the increase in 90° peel-off load is less than 0.05 kg.

[0105] (Peel-off load measurement) The peel-off load was measured by a 90° peel-off test as follows. The surface of the nylon plate was wiped with ethanol to remove any dirt, and then the curable artificial nail composition was applied using a doctor applicator with a coating thickness of 100 μm. The composition was cured by irradiating it with a gel nail curing LED lamp (30 W) for 30 seconds to form a cured coating film. Any uncured components remaining on the surface of the cured coating film were wiped off with ethanol. A cut measuring 1 cm vertically and 5 cm horizontally or more was made in the cured coating film, and starting from the horizontal edge, the film was clamped with a clip attached to a digital force gauge (Imada, ZTA-100N). The cured coating film was then peeled off from the nylon plate at 100 mm / sec in the horizontal direction at a peel angle of 90° along the cut over a length of 5 cm, and the peel-off load (the maximum load (kg) required to peel off the cured coating film) was measured.

[0106] [Table 1]

[0107] It can be seen from Examples 1 to 8 that the curable artificial nail composition according to the present invention is excellent in all of the handleability evaluation, leveling property evaluation, fluidity evaluation, and adhesiveness evaluation. On the other hand, it can be seen that curable artificial nail compositions that do not contain inorganic fillers are inferior in the adhesiveness evaluation and fluidity evaluation, and curable artificial nail compositions with an inorganic filler content of more than 7.0 mass % are inferior in the handleability evaluation and leveling ability evaluation.

Claims

1. (A) a urethane (meth)acrylate oligomer, (B) an alicyclic monofunctional (meth)acrylate compound, (C) a hydroxyl group-containing (meth)acrylate compound, (D) an acylphosphine polymerization initiator, (E) a polymerization initiator other than an acylphosphine-based polymerization initiator, (F) inorganic filler, wherein the content of the inorganic filler (F) is more than 0 mass % and not more than 7.0 mass % based on 100 mass % of the total amount of the curable artificial nail composition.

2. The curable artificial nail composition according to claim 1, which is used to form a base coat layer of a gel nail.

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