Curable artificial nail composition

Abstract

To provide a curable artificial nail composition in which temperature rise is controlled during curing, the hardness of the cured coating is high, the durability of the cured coating is superior, and cracks and surface irregularities are prevented even if the cured coating is sanded, and a smooth surface can be formed.SOLUTION: A curable artificial nail composition comprises: (A) a polyether-based polyurethane (meth)acrylate oligomer and / or a polycarbonate-based polyurethane (meth)acrylate oligomer, (B) a (meth)acrylate monomer, and (C) a polymerization initiator, wherein the (meth)acrylate monomer (B) includes (b1) trimethylolpropane tri(meth)acrylate and / or (b2) polypentaerythritol octa(meth)acrylate, the content of (b1) trimethylolpropane tri(meth)acrylate is more than 1.0 mass% and 17.0 mass% or less based on the total 100 mass% of the curable artificial nail composition, and the content of (b2) polypentaerythritol octa(meth)acrylate is 0.5 mass% or more and 12.0 mass% or less based on the total 100 mass% 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 nails on the hands and feet or gluing artificial nails and then decorating them, is becoming increasingly popular. In addition, artificial nails are formed on top of the nails to reinforce them and prevent them from cracking or peeling off due to external forces. For such nail decoration or reinforcement, resin-containing materials, so-called manicures, pedicures, and sculptures, are applied to the nails.

[0003] Recently, a photocurable artificial nail composition called gel nail has been attracting attention as a material used for decorating or reinforcing nails. Gel nail is a photocurable gel-like nail coating material (photocurable artificial nail composition), and is known to contain, for example, a (meth)acrylate oligomer and a (meth)acrylic monomer. Gel nail is applied to the nail and cured by irradiating with ultraviolet light, forming a crosslinked polymer coating by radical polymerization reaction, which is said to form a tough coating that is difficult to peel off from the nail.

[0004] It is known that when a curable coating film is formed using a curable artificial nail composition, curing heat (polymerization heat) is generated as the curable compound cures (polymerizes), and the temperature rises during curing becomes high. If the temperature rise during curing is high, the user may feel hot (pain from heat), feel scared, or feel uncomfortable. For this reason, there is a demand for a curable artificial nail composition that maintains the properties such as curability of the curable artificial nail composition and further has a lower temperature rise during curing.

[0005] In addition, the hardness of the cured coating film of the curable artificial nail composition (the hardness of the gel nail coating) is controlled by various factors. For example, (a) adjusting the molecular structure and reaction rate of the components of the curable artificial nail composition; (b) As a monomer that is a component of the curable artificial nail composition, attention is paid to the glass transition temperature (Tg) when a homopolymer is formed, (c) adjusting the crosslink density, etc., of the cured coating film of the curable artificial nail composition; Attempts have been made to control the hardness of the cured coating film of the curable artificial nail composition by the above methods. Among these, (b) the hardness of the cured coating film of the curable artificial nail composition has been improved by using a monomer that has a high glass transition temperature (Tg) when it is formed into a homopolymer as a monomer that is a component of the curable artificial nail composition. This method is known to be able to suppress the temperature rise during curing because it generates little heat during curing, and to have almost no adverse effect on other properties.

[0006] As curable artificial nail compositions, the following have been known, for example: Patent Document 1 discloses a curable composition for nail coating that exhibits good curability while also exhibiting excellent wettability to a substrate, coating film hardness, and storage stability.

[0007] Patent Document 2 discloses a light-curing gel nail base that has an excellent balance of adhesion to the nail and releasability, cures quickly, and also has excellent adhesion to the gel nail layer laminated on top, making it ideal for gel nails. Patent Document 3 discloses a photocurable artificial nail composition that has excellent surface gloss, simple and quick operability, good surface curing properties after photocuring, good stain resistance, and low curing heat generation. Patent Document 4 discloses a photocurable artificial nail composition that can provide a coating that is prevented from fading or discoloring and can be used for as long a period as possible. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2022-41419 A [Patent Document 2] JP 2013-043853 A [Patent Document 3] JP 2019-006689 A [Patent Document 4] JP 2018-023682 A Summary of the Invention [Problem to be solved by the invention]

[0009] Recently, gel nails have been applied using the fill-in method. The fill-in method is a method in which, when changing to a new gel nail, the entire gel nail is not removed, but the base gel is left behind and the top layer of the base gel is sanded off with a sanding machine, and then a new gel nail is applied on top of it to form a new gel nail. According to the inventors' confirmation, in the case of a cured coating film of a curable artificial nail composition in which the hardness is improved by using a monomer having a high glass transition temperature (Tg) when forming a homopolymer as the main component of the curable artificial nail composition, when an external force is applied, the cured coating film behaves hard until deformation occurs, but because the crosslinking density is not high, flexibility is expressed, and there is a risk that the cured coating film will be rolled up with a sanding machine and unintentionally peeled off. On the other hand, if the hardness of the cured coating film is further improved with the same design concept, it may become too hard and cause brittle fracture. For this reason, there was a high risk of problems occurring when using monomers with high glass transition temperatures (Tg) as components of fill-in type gel nails when they form homopolymers.

[0010] The present inventors have investigated the monomer composition of a curable artificial nail composition that suppresses the temperature rise during curing, provides a cured coating film with high hardness and excellent durability, and suppresses the occurrence of cracks and unevenness even when the cured coating film is sanded, and can form a smooth surface. As a result, the inventors have found that a curable artificial nail composition having these properties can be formed by containing a specific polyurethane (meth)acrylate and specific amounts of a specific trifunctional (meth)acrylate monomer and / or a specific octafunctional (meth)acrylate monomer.

[0011] The problem to be solved by the present invention is to provide a curable artificial nail composition which reduces the temperature rise during curing, provides a cured coating film with high hardness and excellent durability, and prevents the occurrence of cracks or unevenness even when the cured coating film is sanded, thereby enabling the formation of a smooth surface. [Means for solving the problem]

[0012] As a result of intensive research into solving the above problems, the present inventors have found that the above problems can be solved by providing a curable artificial nail composition that contains a (meth)acrylate compound that includes a specific component, and have thus completed the present invention. Specifically, the following applies: [Section 1] (A) a polyether-based polyurethane (meth)acrylate oligomer and / or a polycarbonate-based polyurethane (meth)acrylate oligomer, (B) a (meth)acrylate monomer, (C) a polymerization initiator, A curable artificial nail composition comprising: the (B) (meth)acrylate monomer comprises (b1) trimethylolpropane tri(meth)acrylate and / or (b2) polypentaerythritol octa(meth)acrylate; the content of the (b1) trimethylolpropane tri(meth)acrylate is more than 1.0 mass% and 17.0 mass% or less, based on 100 mass% of the total amount of the curable artificial nail composition; The content of the (b2) polypentaerythritol octa(meth)acrylate is 0.5% by mass or more and 12.0% by mass or less in 100% by mass of the total amount of the curable artificial nail composition. The curable artificial nail composition. [Section 2] The curable artificial nail composition satisfies the following requirement (I) or (II); Requirement (I): The weight average molecular weight of the polyether-based polyurethane (meth)acrylate oligomer and the polycarbonate-based polyurethane (meth)acrylate oligomer is 10,000 or more, and the composition is for forming a base coat layer in a gel nail. Item 2. The curable artificial nail composition according to Item 1, which satisfies Requirement (II): that it does not contain a plasticizer and is for forming a top coat layer in a gel nail. Effect of the Invention

[0013] The present invention provides a curable artificial nail composition which reduces the temperature rise during curing, provides a cured coating film with high hardness and excellent durability, and is capable of forming a smooth surface with reduced cracking and unevenness even when the cured coating film is sanded. Although the mechanism by which the curable artificial nail composition of the present invention exerts such effects is unclear, the present inventors speculate as follows. The trifunctional monomer trimethylolpropane tri(meth)acrylate and the octafunctional monomer polypentaerythritol octa(meth)acrylate contained in the curable artificial nail composition of the present invention have a large number of functional groups per molecule, and can increase the crosslinking density, making it possible to form a cured coating film with high hardness. Furthermore, since the number of functional groups is large, curing (crosslinking) begins all at once, which causes a sudden loss of fluidity, and it is presumed that this can suppress the temperature rise during curing.

[0014] The curable artificial nail composition of the present invention contains a specific polyurethane (meth)acrylate oligomer and a specific trifunctional (meth)acrylate monomer and / or a specific octafunctional (meth)acrylate monomer, so that the crosslink density can be increased when a cured coating film is formed, the cured coating film can be easily sanded, and the occurrence of cracks and unevenness during sanding can be suppressed. In particular, in the case of a dispersion system containing a pigment or the like, the breakage of the cured coating film is likely to be brittle breakage rather than ductile breakage, so that breakage such as cracking occurs during sanding and cracks tend to spread to unintended areas, but it is speculated that the components of the curable artificial nail composition of the present invention can suppress the spread of cracks. However, the present invention is not limited to these speculations. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The curable artificial nail composition of the present invention will be described below. The curable artificial nail composition of the present invention is a curable artificial nail composition containing (A) a polyether-based polyurethane (meth)acrylate oligomer and / or a polycarbonate-based polyurethane (meth)acrylate oligomer, (B) a (meth)acrylate monomer, and (C) a polymerization initiator, the (B) (meth)acrylate monomer comprises (b1) trimethylolpropane tri(meth)acrylate and / or (b2) polypentaerythritol octa(meth)acrylate; the content of the (b1) trimethylolpropane tri(meth)acrylate is more than 1.0 mass% and 17.0 mass% or less, based on 100 mass% of the total amount of the curable artificial nail composition; The curable artificial nail composition has a content of the polypentaerythritol octa(meth)acrylate (b2) of 0.5% by mass or more and 12.0% by mass or less, based on 100% by mass of the total amount of the curable artificial nail composition. In this specification, the term "(meth)acrylate oligomer" refers to an acrylate oligomer and a methacrylate oligomer, and the term "(meth)acrylate monomer" refers to an acrylate monomer and a methacrylate monomer.

[0016] [(A) Polyether-based polyurethane (meth)acrylate oligomer and / or polycarbonate-based polyurethane (meth)acrylate oligomer] There are no particular limitations on the polyether-based polyurethane (meth)acrylate oligomer, so long as it is an oligomer having one or more (meth)acryloyl groups in the molecule and having 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 at least one (meth)acryloyl group in the molecule and has a plurality of polycarbonate repeating units and a plurality of polyurethane repeating units.

[0017] The polyether-based polyurethane (meth)acrylate oligomer can be synthesized, for example, by forming an isocyanate group- or hydroxyl group-containing urethane prepolymer by reaction between a polyisocyanate component and a polyol component containing a polyether-based polyol, and 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 is not limited to this method. In the present invention, it is preferable to form an isocyanate group-containing urethane prepolymer by reaction between a polyisocyanate component and a polyol component, and react the isocyanate group-containing urethane prepolymer with a (meth)acrylate compound containing a hydroxyl group.

[0018] The polycarbonate-based polyurethane (meth)acrylate oligomer can be synthesized, for example, by forming an isocyanate group- or hydroxyl group-containing urethane prepolymer by reaction between a polyisocyanate component and a polyol component containing a polycarbonate-based polyol, and 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 is not limited to this method. In the present invention, it is preferable to form an isocyanate group-containing urethane prepolymer by reaction between a polyisocyanate component and a polyol component, and react the isocyanate group-containing urethane prepolymer with a (meth)acrylate compound containing a hydroxyl group.

[0019] 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, methylene bis(4-cyclohexyl isocyanate), trimethylhexamethylene diisocyanate, hydrogenated tolylene diisocyanate, dicyclohexylmethane diisocyanate, carbodiimide-modified polyisocyanates of these, and isocyanurate-modified polyisocyanates of these.

[0020] 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 includes one or more compounds having a hydroxyl group at the polycarbonate molecular chain terminal.

[0021] Examples of polyol components other than polyether-based polyols and polycarbonate-based polyols used in producing the 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.

[0022] 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.

[0023] 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 thereof, and then subjecting 10% or more of the total number of isocyanate groups in the urethane prepolymer to an addition reaction of the (meth)acrylic compound having a hydroxyl group.

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

[0025] As the urethane (meth)acrylate oligomer, a commercially available product can be used. Examples of commercially available products include, but are not limited to, one or more selected from the group consisting of SUA-017, SUA-023 (manufactured by Asia Chemical Industries Co., Ltd.), SUA TH1, SUA-2, SUA-3, SUA-16N (manufactured by KSM Co., Ltd.), Art Resin UN-6200, UN-6207, UN-6303, UN-6304, UN-6305, UN-6306, UN-6307, UN-6060S, UN-5500, UN-5590, UN-9000PEP, UN-9200A (manufactured by Negami Chemical Industries Co., Ltd.), AU-2040 (manufactured by Tokushiki Co., Ltd.), KUA-PC2I, KUA-PEA21, KUA-PEB21, KUA-PEC21 (manufactured by KSM Co., Ltd.), and the like.

[0026] The number of (meth)acryloyl groups contained in one molecule of the polyether-based polyurethane (meth)acrylate oligomer and the polycarbonate-based polyurethane (meth)acrylate oligomer is not particularly limited as long as it is 1 or more. From the viewpoints of the curability of the curable artificial nail composition, the hardness of the cured coating film, and the like, the number is 2 or more and is, for example, 10 or less, and preferably 8 or less. In the present invention, 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.

[0027] The weight average molecular weight of the polyether-based polyurethane (meth)acrylate oligomer and the polycarbonate-based polyurethane (meth)acrylate oligomer is not particularly limited, and is, for example, more than 1000, preferably 2000 or more, more preferably 5000 or more, and is, for example, 100000 or less, preferably 50000 or less, more preferably 40000 or less. In the present invention, when the curable artificial nail composition is used for forming a base coat layer in a gel nail, the weight average molecular weight of (A) the polyether-based polyurethane (meth)acrylate oligomer and polycarbonate-based polyurethane (meth)acrylate oligomer is 10,000 or more.

[0028] The content of (A) polyether-based polyurethane (meth)acrylate oligomer and / or polycarbonate-based polyurethane (meth)acrylate oligomer in the curable artificial nail composition of the present invention is not particularly limited. The total amount of the curable artificial nail composition is taken as 100 mass%, and it can be, for example, 25 mass% or more, preferably 35 mass% or more, more preferably 40 mass% or more, and can be, for example, 80 mass% or less, preferably 75 mass% or less, more preferably 70 mass% or less. If it is less than 25 mass%, the viscosity may be too low, resulting in poor applicability, and the cured coating film may become too hard and brittle. If it exceeds 80 mass%, the viscosity may be too high, resulting in poor applicability.

[0029] The curable artificial nail composition of the present invention contains (A) a polyether-based polyurethane (meth)acrylate oligomer and / or a polycarbonate-based polyurethane (meth)acrylate oligomer as a constituent component, which allows the curable artificial nail composition to have excellent viscosity, curability, and temperature rise during curing (curing heat), and can provide a cured coating film that has excellent release properties, hardness, and elongation.

[0030] [(B) (Meth)acrylate Monomer] The (B) (meth)acrylate monomer is not particularly limited as long as it contains (b1) trimethylolpropane tri(meth)acrylate and / or (b2) polypentaerythritol octa(meth)acrylate and is a compound other than the (A) polyether-based polyurethane (meth)acrylate oligomer and polycarbonate-based polyurethane (meth)acrylate oligomer.

[0031] <(b1) Trimethylolpropane tri(meth)acrylate> (b1) Trimethylolpropane tri(meth)acrylate may be any of trimethylolpropane triacrylate alone, trimethylolpropane trimethacrylate alone, or a mixture of trimethylolpropane triacrylate and trimethylolpropane trimethacrylate.

[0032] The content of (b1) trimethylolpropane tri(meth)acrylate in the curable artificial nail composition of the present invention is more than 1.0% by mass and not more than 17.0% by mass, based on the total amount of the curable artificial nail composition (100% by mass). This allows for improved adhesion to the substrate. It is preferably 1.05% by mass or more, more preferably 1.1% by mass or more, and preferably 16.0% by mass or less, more preferably 15.0% by mass or less. If it is 1.0% by mass or less, the strength of the cured coating film may be reduced, and the gel nail may not last as long. If it exceeds 17.0% by mass, the cured coating film may become too hard, brittle, and easily chipped.

[0033] <(b2) Polypentaerythritol octa(meth)acrylate> (b2) As the polypentaerythritol octa(meth)acrylate, tripentaerythritol octa(meth)acrylate can be used, and examples thereof include an ester of a hydroxyl group of a pentaerythritol polymer and (meth)acrylic acid, which has eight apparent (meth)acrylate groups. For example, a "mixture of tripentaerythritol acrylate, mono- and dipentaerythritol acrylate, and polypentaerythritol acrylate" (manufactured by Osaka Organic Chemical Industry Co., Ltd., "Viscoat #802, TriPEA") can be used.

[0034] The content of (b2) polypentaerythritol octa(meth)acrylate in the curable artificial nail composition of the present invention is 0.5% by mass or more and 12.0% by mass or less, based on 100% by mass of the total amount of the curable artificial nail composition. This allows the adhesion to the substrate to be improved. It is preferably 0.7% by mass or more, more preferably 1.0% by mass or more, and preferably 11.5% by mass or less, more preferably 11.0% by mass or less. If it is less than 0.5% by mass, the strength of the cured coating film may be reduced, and the gel nail may not last as long. If it exceeds 12.0% by mass, the cured coating film may become too hard, brittle, and easily chipped.

[0035] In the curable artificial nail composition of the present invention, when both (b1) trimethylolpropane tri(meth)acrylate and (b2) polypentaerythritol octa(meth)acrylate are contained, the content thereof is 1.5% by mass or more and 16.0% by mass or less in 100% by mass of the total amount of the curable artificial nail composition, thereby improving the adhesion to the substrate.

[0036] <(Meth)acrylate compounds other than (b1) and (b2)> In the present invention, the (B) (meth)acrylate monomer may contain a (meth)acrylate compound other than (b1) trimethylolpropane tri(meth)acrylate and (b2) polypentaerythritol octa(meth)acrylate (sometimes referred to as "(meth)acrylate compound other than (b1) and (b2)"). The molecular weight of the (meth)acrylate compound other than (b1) and (b2) is 1,000 or less. The number of (meth)acryloyl groups contained in the molecule of the (meth)acrylate compound other than (b1) and (b2) is not particularly limited, and is 1 or more, for example 10 or less, preferably 8 or less, more preferably 6 or less, from the viewpoints of the curability of the curable artificial nail composition and the hardness of the cured coating film.

[0037] Among the (meth)acrylate compounds other than (b1) and (b2), examples of the (meth)acrylate compounds having one (meth)acryloyl group 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 the like. acrylate, benzyl (meth)acrylate, isobornyl (meth)acrylate, adamantyl (meth)acrylate, cyclohexyl (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, dicyclopentanyl (meth)acrylate, and other monohydric alcohols and (meth)acrylic acid esters; acrylamide, hydroxyethyl acrylamide, dimethyl acrylamide, diethyl acrylamide, methacrylamide, N-methyl (meth)acrylamide, N-hydroxyethyl (meth)acrylamide, N-ethyl (meth)acrylamide, N-methylol (meth)acrylamide, N-methoxymethyl (meth)acrylamide, N-butoxymethyl (meth)acrylamide, 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-diisobutyric (meth)acryloyl group-containing amide compounds such as N,N-di-tert-butyl(meth)acrylamide, N,N-diheptyl(meth)acrylamide, N,N-dioctyl(meth)acrylamide, N,N-di-tert-octyl(meth)acrylamide, N,N-didodecyl(meth)acrylamide, N,N-dioctadecyl(meth)acrylamide, N,N-dimethylaminopropyl(meth)acrylamide, and N,N-dimethylaminoethyl(meth)acrylamide;Hydroxyl group-containing (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, and pentaerythritol mono(meth)acrylate; nitrogen-containing alkyl (meth)acrylates such as N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, and Nt-butylaminoethyl (meth)acrylate; (meth)acryloyloxyethyl phosphate, phosphate Phosphate ester-based (meth)acrylates such as (meth)acryloyloxypropyl, caprolactone-modified (meth)acryloyloxyethyl phosphate, (meth)acrylic acid ethyl hexanoate phosphate, and (meth)acrylic acid pentyl propanoate phosphate; glycidyl (meth)acrylate, 4-(meth)acryloyloxymethyl-2-cyclohexyl-1,3-dioxolane, (2-methyl-2-ethyl-1,3-dioxolan-4-yl)methyl (meth)acrylate, and cyclic trimethylol. Propane 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, alkoxylated tetrahydrofurfuryl (meth)acrylate ) 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, N-(meth)acryloxyphthalimide and other heterocyclic ring-containing (meth)acrylates can be mentioned as one or more selected from the group consisting of;

[0038] Among these (meth)acrylate compounds having one (meth)acryloyl group, straight-chain or branched alkyl group-containing (meth)acrylates such as 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, and neopentyl (meth)acrylate; alicyclic mono(meth)acrylate monomers such as isobornyl (meth)acrylate, adamantyl (meth)acrylate, and cyclohexyl (meth)acrylate; hydroxyethyl acrylamide, dimethyl acrylamide, diethyl acrylamide, N-methyl (meth)acrylamide, and N-hydroxyethyl At least one selected from the group consisting of (meth)acrylamide, N-ethyl (meth)acrylamide, N-methylol (meth)acrylamide, N,N-dimethylaminopropyl (meth)acrylamide, N,N-dimethylaminoethyl (meth)acrylamide, and other (meth)acryloyl group-containing amide compounds; 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, and other hydroxyl group-containing (meth)acrylates; (meth)acryloylmorpholine, N-(meth)acryloyloxyethylhexahydrophthalimide, tetrahydrofurfuryl (meth)acrylate, (2-methyl-2-ethyl-1,3-dioxolan-4-yl)methyl acrylate, and other heterocyclic ring-containing (meth)acrylates is preferred.

[0039] Among the (meth)acrylate compounds other than (b1) and (b2), examples of the (meth)acrylate compounds having two or more (meth)acryloyl groups include 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, and the like. ) acrylate, ethoxylated propylene glycol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, glycerin di(meth)acrylate, 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 bis Phenol A di(meth)acrylate (isopyridenediphenylbis(oxyhydroxypropyl methacrylate), etc.), isocyanuric acid di(meth)acrylate, propoxylated ethoxylated bisphenol A di(meth)acrylate, di(meth)acryloyloxyethyl phosphate, di(meth)acryloyloxypropyl phosphate, caprolactone-modified di(meth)acryloyloxyethyl phosphate, di(meth)acrylic acid ethyl hexanoate phosphate, di(meth)acrylic acid pentyl propanoate phosphate, etc. Di(meth)acrylate monomers such as phosphate ester-based di(meth)acrylates; tri(meth)acrylate monomers such as glycerin tri(meth)acrylate, ditrimethylolpropane tri(meth)acrylate, pentaerythritol 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;Examples of the monomer include at least one selected from the group consisting of 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.

[0040] Of these (meth)acrylate compounds having two or more (meth)acryloyl groups, it is preferable to use one or more selected from the group consisting of ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, polypropylene di(meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, propoxylated bisphenol A dimethacrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and the like.

[0041] The content of the (meth)acrylate compound other than (b1) and (b2) in the curable artificial nail composition of the present invention is not particularly limited. The content can be, for example, 5% by mass or more, preferably 7% by mass or more, more preferably 10% by mass or more, and can be, for example, 50% by mass or less, preferably 45% by mass or less, more preferably 40% by mass or less, based on the total amount of the curable artificial nail composition being 100% by mass. If the content of the (meth)acrylate compound other than (b1) and (b2) is less than 5% by mass, the viscosity may become too high, resulting in poor applicability, and there is a risk of uncured components remaining on the surface when the cured coating film is formed. If the content exceeds 50% by mass, the viscosity may become too low, resulting in poor applicability, the cured coating film may become too hard and brittle, and the curing heat of the curable artificial nail composition may become high, resulting in a high temperature rise during curing.

[0042] By using a (meth)acrylate compound other than (b1) and (b2) as a constituent component, the curable artificial nail composition of the present invention can have excellent viscosity, curability, and temperature rise during curing (curing heat), and can provide a cured coating film that is excellent in terms of release properties, hardness, and elongation.

[0043] [(C) Polymerization initiator] The (C) polymerization initiator, which is a component of the curable artificial nail composition of the present invention, is not particularly limited as long as it generates radicals when given energy by irradiation with light (e.g., ultraviolet light) or heat, and can initiate polymerization of the (A) polyether-based polyurethane (meth)acrylate oligomer and / or polycarbonate-based polyurethane (meth)acrylate oligomer and the (B) (meth)acrylate monomer. For example, one or more polymerization initiators selected from the group consisting of acylphosphine oxides, α-hydroxyalkylphenones, benzoin ethers, benzyl ketals, acid esters, α-aminoalkylphenones, benzophenones, thioxanthones, titanocenes, quinones, peroxides, azos, and persulfates can be used. For example, when a photopolymerization initiator is used, good curability can be imparted to the curable artificial nail composition even when the composition is irradiated with light using various light sources including a UV-LED light source.

[0044] For example, an acylphosphine oxide-based polymerization initiator generates radicals when irradiated with ultraviolet light having a wavelength of 365 to 405 nm emitted from a commonly used UV-LED light source. Therefore, even when the composition is cured by irradiating light using various light sources including a UV-LED light source, the composition can be imparted with good curability. Furthermore, when the composition is cured by irradiating light using a UV-LED light source, yellowing of the cured coating film can be prevented. 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, it is preferable to use 2,4,6-trimethylbenzoyldiphenylphosphine oxide (OMNIRAD TPO) or 2,4,6-trimethylbenzoylethoxyphenylphosphine oxide. 2,4,6-trimethylbenzoyldiphenylphosphine oxide can be preferably used because it also functions as a skin conditioning agent.

[0045] Examples of polymerization initiators other than acylphosphine oxide 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-methyl Propan-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, 1-chloro-4-propylthioxanthone, 3-[3,4-dimethyl-9-oxo-9H-thioxanthone-2-yl-oxy]-2-hydroxypropyl-N,N,N-trimethylammonium chloro lide, 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)-butanone-1,2,2-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 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(isobutyronitrile), 2,2'-azobis-2-methylbutyronitrile, 1,1-azobis(1-cyclohexanecarbonitrile), 2,2'-azobis(2-methylpropionitrile), 2,2'-azobis(2-cyclopropylpropionitrile), 2,2'-azobis(methylisobutyrate), 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 Side paroxysmal, 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,Examples of the peroxycarbonyl group include 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, and ammonium persulfate.

[0046] In the curable artificial nail composition of the present invention, it is preferable to use a polymerization initiator capable of generating radicals and initiating polymerization at ultraviolet wavelengths of around 405 nm and around 365 nm irradiated during curing, and it is more preferable to use a polymerization initiator containing an acylphosphine oxide polymerization initiator. In addition to the acylphosphine oxide polymerization initiator, a polymerization initiator containing an α-hydroxyalkylphenone polymerization initiator may be used, and a polymerization initiator composition containing an acylphosphine oxide polymerization initiator and a peroxide polymerization initiator may also be used.

[0047] In the curable artificial nail composition of the present invention, the content of the polymerization initiator (C) is, for example, 0.1% by mass or more, preferably 1.0% by mass or more, more preferably 4.0% by mass or more, and for example, 15.0% by mass or less, preferably 12.0% by mass or less, more preferably 10.0% by mass or less, based on 100% by mass of the total amount of the curable artificial nail composition. If the content of the polymerization initiator (C) exceeds 15.0% by mass, the cured coating film of the curable artificial nail composition may become brittle or may turn yellow (yellowing). If the content of the polymerization initiator (C) is less than 0.1% by mass, the curing of the curable artificial nail composition may take a long time, and curing may be insufficient.

[0048] In the curable artificial nail composition of the present invention, when a polymerization initiator containing an acylphosphine oxide polymerization initiator and an α-hydroxyalkylphenone polymerization initiator is used as the polymerization initiator (C), the content of the acylphosphine oxide polymerization initiator is, for example, 0.05% by mass or more, preferably 0.5% by mass or more, more preferably 1.0% by mass or more, and, for example, 4.0% by mass or less, preferably 3.0% by mass or less, and more preferably 2.0% by mass or less, based on 100% by mass of the total amount of the curable artificial nail composition. The content of the α-hydroxyalkylphenone polymerization initiator is, for example, 1.0% by mass or more, preferably 2.0% by mass or more, more preferably 3.0% by mass or more, and, for example, less than 15.0% by mass, preferably 12.0% by mass or less, and more preferably 10.0% by mass or less, based on 100% by mass of the total amount of the curable artificial nail composition. The total content of the acylphosphine oxide polymerization initiator and the α-hydroxyalkylphenone polymerization initiator is, for example, 1.05% by mass or more, preferably 2.0% by mass or more, more preferably 3.0% by mass or more, even more preferably 4.0% by mass or more, and even more preferably 4.1% by mass or more, and is, for example, 15.0% by mass or less, preferably 12.0% by mass or less, and more preferably 10.0% by mass or less. If the content of the acylphosphine oxide polymerization initiator exceeds 4.0% by mass, the cured coating film of the curable artificial nail composition may become brittle or may turn yellow (yellowing). If the content of the acylphosphine oxide polymerization initiator is less than 0.05% by mass, the curing heat of the curable artificial nail composition may become high, and the temperature rise during curing may become large.

[0049] [(D) Other ingredients] In addition to the above (A) to (C), various components can be blended as "(D) other components" in the curable artificial nail composition of the present invention within a range that does not adversely affect the storage stability, curability, color tone of the cured coating film, durability of the cured coating film, adhesion of the cured coating film, viscosity, handleability, coatability, etc. Examples of the (D) other components include one or more selected from the group consisting of various additives such as radical polymerizable compounds other than (A) and (B), resins, polyfunctional thiol compounds, polymerization inhibitors, colorants, polyol compounds, solvents, plasticizers, fragrances, anti-settling agents such as alumina, silicone-based and fluorine-based defoamers, silane coupling agents such as γ-glycidoxypropyltrimethoxysilane, polymerization accelerators such as tertiary amines, surface tension adjusters, flame retardants, antioxidants, ion adsorbents, stress reducers, preservatives, antibacterial agents, flexibility imparting agents, waxes, halogen traps, leveling agents, wetting improvers, and decorative materials.

[0050] <Radically polymerizable compounds other than (A) and (B)> The radical polymerizable compound other than (A) and (B) is not particularly limited as long as it is a (meth)acrylate oligomer other than (A) a polyether-based polyurethane (meth)acrylate oligomer and a polycarbonate-based polyurethane (meth)acrylate oligomer, or a radical polymerizable compound other than (B) a (meth)acrylate monomer.

[0051] (A) Examples of the (meth)acrylate oligomer other than 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 polyester-based polyurethane (meth)acrylate oligomer, epoxy (meth)acrylate oligomer, ester (meth)acrylate oligomer, ether (meth)acrylate oligomer, and the like.

[0052] (B) Examples of the radical polymerizable compound other than the (meth)acrylate monomer include one or more selected from the group consisting of vinyl group-containing compounds, allyl group-containing compounds, etc. Specific examples include one or more selected from the group consisting of styrene, α-methylstyrene, vinyl toluene, α-chlorostyrene, vinyl acetate, vinyl propionate, methyl vinyl ether, ethyl vinyl ether, N-vinylpyrrolidone, vinylpyridine, allyl glycidyl ether, vinyl group-containing oligomers, allyl group-containing oligomers, etc.

[0053] <Resin> The resin is not particularly limited as long as it is neither polymerizable nor a polyol compound, and examples thereof include at least one selected from the group consisting of polyurethane resins, polyester resins, polyamide resins, polyether resins, olefin resins, aromatic olefin resins, aromatic hydrocarbon resins, acrylic resins, vinyl chloride resins, vinyl acetate resins, polyvinyl alcohol resins, polyvinyl acetal resins, core-shell polymers, graft resins, and block resins.

[0054] <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 regulator, a crosslinking agent, and a viscosity regulator of the curable artificial nail composition. By blending the polyfunctional thiol compound in the curable artificial nail composition, it is possible to suppress the remaining of uncured components on the surface of the cured coating film. Examples of polyfunctional thiol compounds include those obtained by reacting a hydroxyl group of a polyol compound such as trimethylolpropane, pentaerythritol, dipentaerythritol, or ethylene glycol with a compound having a thiol group or a group that reacts to become a thiol group. For example, trimethylolpropane tris(3-mercaptopropionate), trimethylolpropane tristhioglycolate, trimethylolpropane tris(3-mercaptobutyrate), pentaerythritol tetrakis thioglycolate, pentaerythritol tetrakis(3-mercaptobutyrate), pentaerythritol tetrakis(3-mercaptopropionate), dipentaerythritol hexakis(3-mercaptopropionate), dipentaerythritol hexakis(3-mercaptobutyrate), 1,3,5-tris[2-(3-mercaptobutyryloxy)ethyl]-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, tris[(3-mercaptopropionyloxy)ethyl]-isocyanurate, 1,4-bis(3-mercapto

[0043] Examples of the polyfunctional thiol group-containing monomer include polyfunctional thiol group-containing monomers such as tributylyloxybutane, 1,2-ethanedithiol, 1,3-propanedithiol, 1,4-butanedithiol, 1,6-hexanedithiol, 1,8-octanedithiol, 1,2-cyclohexanedithiol, decanedithiol, ethylene glycol bisthioglycolate, ethylene glycol bisthiopropionate, ethylene glycol bisthioglycolate (EGTG), 1,4-butanediol bisthiopropionate (BDTG), trimercaptopropionic acid tris(2-hydroxyethyl)isocyanurate, 1,4-dimethylmercaptobenzene, 2,4,6-trimercapto-s-triazine, and 2-(N,N-dibutylamino)-4,6-dimercapto-s-triazine.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 tetrakis thioglycolate, pentaerythritol tetrakis(3-mercaptobutyrate), and pentaerythritol tetrakis(3-mercaptopropionate) are preferred.

[0055] <Polymerization inhibitor> The polymerization inhibitor is not particularly limited as long as it is a compound capable of suppressing the polymerization of the (meth)acrylate compounds (A) and (B). For example, one or more selected from the group consisting of tocopherol-based compounds, quinone-based compounds, phenol-based compounds, catechol-based compounds, oxydiphenylamine-based compounds, nitroso-based compounds, nitrone-based compounds, nitrile-based compounds, hydrazyl-based compounds, and phenothiazine-based compounds can be mentioned. Among these, it is preferable to use tocopherol-based compounds and / or quinone-based compounds.

[0056] Examples of tocopherol compounds include tocol, α-tocopherol, β-tocopherol, γ-tocopherol, δ-tocopherol, η-tocopherol, α-tocotrienol, β-tocotrienol, γ-tocotrienol, δ-tocotrienol, α-tocopherol acetate, β-tocopherol acetate, γ-tocopherol acetate, δ-tocopherol acetate, α-tocopherol succinate, β-tocopherol succinate, γ-tocopherol succinate, and δ-tocopherol succinate. α-tocopherol glycine ester, β-tocopherol glycine ester, γ-tocopherol glycine ester, δ-tocopherol glycine ester, α-tocotrienol acetate, β-tocotrienol acetate, γ-tocotrienol acetate, δ-tocotrienol acetate, α-tocotrienol succinate, β-tocotrienol succinate, γ-tocotrienol succinate, δ-tocotrienol succinate, and the like. Preferably, there is one or more selected from the group consisting of tocol, α-tocopherol, β-tocopherol, γ-tocopherol, δ-tocopherol, η-tocopherol, α-tocotrienol, β-tocotrienol, γ-tocotrienol, δ-tocotrienol, α-tocopherol acetate, β-tocopherol acetate, γ-tocopherol acetate, δ-tocopherol acetate, and the like.

[0057] Examples of quinone compounds include one or more compounds selected from the group consisting of hydroquinone, hydroquinone monomethyl ether, 1-o-2,3,5-trimethylolhydroquinone, 2-tert-butylhydroquinone, methylhydroquinone, dimethylhydroquinone, di-t-butylhydroquinone, benzoquinone, p-benzoquinone, 2,6-dichloro-p-benzoquinone, and 2,5-dichloro-p-benzoquinone.

[0058] An example of the phenolic compound is 3,5-t-dibutyl-6-hydroxytoluene. Examples of the catechol compounds include catechol, 4-t-butylcatechol, and the like. Examples of the oxydiphenylamine compounds include 2-oxydiphenylamine, its hydroxyl position isomers, phenyl group substitution products, and amino group alkyl substitution products. Examples of the nitroso compound include one or more compounds selected from the group consisting of compounds having a nitroso group on the α-carbon of a carbonyl compound (e.g., methyl-α-nitrosoisopropyl ketone), N-nitroso-N-phenylhydroxylamine compounds (e.g., N-nitroso-N-phenylhydroxylamine ammonium salt, N-nitroso-N-phenylhydroxylamine aluminum salt), and the like. An example of the nitrone compound is phenyl-t-butyl nitrone. Examples of nitrile compounds include compounds in which a nitrile group is conjugated (such as furfurylidenemalononitrile). A preferred example of the hydrazyl compound is 1,1-diphenyl-2-picrylhydrazyl. Examples of phenothiazine compounds include phenothiazine or compounds having one or more substituents on the aromatic ring moiety.

[0059] In the curable artificial nail composition of the present invention, the content of the polymerization inhibitor is not particularly limited. For example, it can be more than 0% by mass and 1.0% by mass or less based on the total amount of the curable artificial nail composition. It is preferably 0.01% by mass or more, more preferably 0.03% by mass or more. If the content of the polymerization inhibitor exceeds 1.0% by mass, there is a risk that uncured components remain on the surface of the cured coating film of the curable artificial nail composition, and the composition may thicken over time, resulting in a decrease in applicability and handling, and if no polymerization inhibitor is contained, there is a risk that the storage stability may decrease.

[0060] <Coloring agent> The colorant may be one or more selected from the group consisting of pigments, luster materials, and dyes, 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, luster materials, organic pigments, and dyes used in nail coating materials, and does not significantly inhibit curing by irradiation with ultraviolet light (light irradiation) or the like. The curable artificial nail composition before curing can contain not only pigments but also resin particles and decorative materials that can be incorporated into known curable artificial nail compositions.

[0061] Examples of colorants include Brown No. 201, Black No. 401, Purple No. 201, Purple No. 401, Blue No. 1, Blue No. 2, Blue No. 201, Blue No. 202, Blue No. 203, Blue No. 204, Blue No. 205, Blue No. 403, Blue No. 404, Green No. 201, Green No. 202, Green No. 204, Green No. 205, Green No. 3, Green No. 401, Green No. 402, Yellow No. 201, Yellow No. 202-(1), Yellow No. 20 No. 2-(2), Yellow No. 203, Yellow No. 204, Yellow No. 205, Yellow No. 4, Yellow No. 401, Yellow No. 402, Yellow No. 403-(1), Yellow No. 404, Yellow No. 405, Yellow No. 406, Orange 201 No., Orange No. 203, Orange No. 204, Orange No. 205, Orange No. 206, Orange No. 207, Orange No. 401, Orange No. 402, Orange No. 403, Red No. 102, Red No. 104-(1), Red No. 105-(1 ), Red 106, Red 2, Red 201, Red 202, Red 203, Red 204, Red 205, Red 206, Red 207, Red 208, Red 213, Red 214, Red 215, Red 218, Red 219, Red 220, Red 221, Red 223, Red 225, Red 226, Red 227, Red 228, Red 230-(1), Red 23 Examples of the pigments include one or more selected from the group consisting of Red No. 0-(2), Red No. 231, Red No. 232, Red No. 3, Red No. 401, Red No. 405, Red No. 501, Red No. 502, Red No. 503, Red No. 504, Red No. 505, Red No. 506, titanium oxide, iron oxide, chromium oxide, manganese violet, carbon black, metal powder, metal flakes, metal oxide flakes, glass flakes, and the like.

[0062] In the curable artificial nail composition of the present invention, it is preferable to incorporate a bluing agent in order to form a transparent cured coating film and suppress yellowing of the cured coating film. The bluing agent used in the present invention is preferably one containing a blue colorant and a reactive diluent. As the blue-based colorant, for example, a colorant containing one or more selected from the group consisting of Purple No. 201, Purple No. 401, Blue No. 1, Blue No. 2, Blue No. 201, Blue No. 202, Blue No. 203, Blue No. 204, Blue No. 205, Blue No. 403, Blue No. 404, Green No. 201, Green No. 202, Green No. 204, Green No. 205, Green No. 3, Green No. 401, Green No. 402, etc., is used, preferably a colorant containing one or more selected from the group consisting of Purple No. 201, Purple No. 401, Blue No. 1, Blue No. 2, Blue No. 201, Blue No. 202, Blue No. 203, Blue No. 204, Blue No. 205, Blue No. 403, Blue No. 404, etc. is used. As the reactive diluent, one or more selected from the group consisting of the (B) (meth)acrylate monomers can be used.

[0063] <Polyol compound> 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, and phenolic polyols. Among them, alkyl polyols, polyester polyols, and polyether polyols are preferred. The alkyl polyol may be at least one selected from the group consisting of ethylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,8-octanediol, neopentyl glycol, cyclohexanedimethanol, trimethylolpropane, pentaerythritol, and the like.

[0064] The polyester polyol may be one or more selected from the group consisting of condensation polyester polyol, addition polymerization polyester polyol, polycarbonate polyol, etc. The condensation polyester polyol may be obtained by a condensation reaction between one or more diol compounds selected from the group consisting of ethylene glycol, propylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 1,9-nonanediol, 1,4-hexanedimethanol, diol dimer acid, polyethylene glycol, etc., and one or more organic polybasic acids selected from the group consisting of adipic acid, isophthalic acid, terephthalic acid, sebacic acid, etc., and the molecular weight is preferably 100 to 100,000. The addition polymerization polyester polyol may be polycaprolactone, and the molecular weight is preferably 100 to 100,000. Polycarbonate polyols are synthesized by direct phosgenation of polyols, transesterification with diphenyl carbonate, or the like, and preferably have a molecular weight of 100 or more and 100,000 or less. An example of the polyether polyol is a polyether polyol obtained by ring-opening polymerization of an alkylene oxide.

[0065] <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 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.

[0066] [Viscosity of Curable Artificial Nail Composition] The curable artificial nail composition of the present invention can have a viscosity at 25° C. of, for example, 0.1 Pa·s or more and 60.0 Pa·s or less. 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 setting the viscosity within such a range, a curable artificial nail composition that is excellent in applicability with an applicator such as a brush or inkjet can be obtained.

[0067] [Uses of the curable artificial nail composition] The curable artificial nail composition of the present invention is a composition for coating the surface of the nail, like common manicures and pedicures. The curable artificial nail composition of the present invention can be particularly suitably used as a gel nail, and can be used to form any of the following layers: a base coat layer that is applied directly to the user's nail, a color coat layer that is applied on the base coat layer, and a top coat layer that is applied on the base coat layer. For example, a color coat layer to which a desired color tone has been imparted, a color top coat layer to which a desired color tone has been imparted, a clear top coat layer to which a desired color tone may be imparted, and a clear top coat layer containing glitter (metal powder, metal flakes, metal oxide flakes, glass flakes, etc.) can be mentioned. After applying the curable artificial nail composition of the present invention, it is also possible to attach small decorations, powders, etc. to the coating film surface of the curable artificial nail composition before curing to enhance the design.

[0068] The curable artificial nail composition of the present invention provides a cured coating film that has high hardness and excellent durability, and the cured coating film has excellent machine pressure resistance evaluation. Even when the cured coating film is sanded, the occurrence of cracks and unevenness is suppressed, and a smooth surface can be formed. Therefore, the curable artificial nail composition of the present invention can be suitably used as a curable artificial nail composition for forming a base layer in a fill-in type gel nail.

[0069] 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 in a gel nail when the weight average molecular weight of the polyether-based polyurethane (meth)acrylate oligomer and the polycarbonate-based polyurethane (meth)acrylate oligomer is 10,000 or more.

[0070] When the curable artificial nail composition of the present invention does not contain a plasticizer, it can be suitably used for forming a top coat layer in a gel nail.

[0071] [Coating nails with a curable artificial nail composition] The nails to be coated with the curable artificial nail composition of the present invention may be either human fingernails or toenails, or may be the nails of animals such as dogs and cats, etc. 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 method using an applicator such as a brush or an inkjet may be used. The curable artificial nail composition of the present invention has a cured coating film excellent in machine pressure resistance evaluation, and therefore can 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 and the upper layer of the base gel is sanded with a sanding machine without removing the entire gel nail, and a new gel nail is provided on top of it, thereby forming a new gel nail.

[0072] Using the curable artificial nail composition of the present invention, an uncured coating layer having the shape of a nail or the like can be prepared on at least one surface of a sheet, and this layer can be brought into contact (transferred) with the nail surface, and then cured by irradiating with ultraviolet light, with or without peeling off the sheet. By using a method in which an uncured coating layer is first formed on the sheet surface using a curable artificial nail composition and then this is 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 wash the applicator after use.

[0073] The means for curing the curable artificial nail composition after application is not particularly limited as long as it is a means capable of imparting energy to cause the curing of the curable artificial nail composition. Examples include irradiation with energy rays such as light (ultraviolet rays (UV) etc.), electron beams, and heat. In particular, curing by irradiation with ultraviolet rays (UV) is preferably used since it can be carried out relatively quickly and easily. When curing by irradiation with light such as ultraviolet rays, a known ultraviolet curing device is used. Although the amount of energy required for curing differs depending on the composition of the curable artificial nail composition, for example, when curing by irradiation with light such as ultraviolet rays, the irradiation energy (accumulated light amount) by light irradiation is, for example, 5 mJ / cm. 2 More than 10 mJ / cm, 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.

[0074] As a light source for irradiating light, for example, a known ultraviolet light source such as a multi-type UV lamp (UV+LED), a mercury lamp, a metal halide lamp, an ultraviolet light emitting diode (UV-LED), an ultraviolet laser diode (UV-LD), etc. Among them, from the viewpoints of small size, long life, high efficiency, and low cost, a multi-type lamp (UV+LED) (three-line main wavelength: about 365 nm, about 405 nm, and about 436 nm), an ultraviolet light emitting diode (UV-LED; wavelength about 385 nm to about 415 nm; peak wavelength about 405 nm), and an ultraviolet laser diode (UV-LD) are preferred. EXAMPLES

[0075] 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."

[0076] [Examples 1 to 28, Comparative Examples 1 to 13] The components shown in Tables 1 to 4 were placed in a container in the amounts (parts by mass) shown in Tables 1 to 4, respectively, and heated to 50° C. while stirring with a dissolver. The mixture was defoamed for 10 minutes under a pressure of 0.1 MPa while stirring, and then allowed to stand at 50° C. for 2 hours and defoamed to obtain a curable artificial nail composition. All of these steps were performed in the dark.

[0077] <Ingredients> The components in Tables 1 to 4 are as follows. PU1: Bifunctional polyether polyurethane (meth)acrylate oligomer (weight average molecular weight 21,000) PU2: Bifunctional polycarbonate-based polyurethane (meth)acrylate oligomer (weight average molecular weight 29,000) HEMA: 2-hydroxyethyl methacrylate IBXMA: Isobornyl methacrylate IBXA: Isobornyl acrylate TMPMA: Trimethylolpropane trimethacrylate TMPA: Trimethylolpropane triacrylate TPEA: A mixture of tripentaerythritol acrylate, mono- and dipentaerythritol acrylate, and polypentaerythritol acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., "Viscoat #802, TriPEA") TPO: 2,4,6-trimethylbenzoyldiphenylphosphine oxide HCPK: 1-hydroxycyclohexyl phenyl ketone PMA: A mixture of 2-acryloyloxyethyl phosphate and bis(2-acryloyloxyethyl) phosphate

[0078] <Temperature rise during curing> The temperature rise during curing of each of the obtained curable artificial nail compositions was measured as follows. The start temperature of the measurement was measured using a temperature measuring device during curing attached to a cure shrinkage meter (manufactured by Acroedge, product name "Custron"), and the temperature during curing was measured, and the maximum temperature was taken as the maximum curing heat. The samples used in measuring maximum heat of cure were prepared as follows. A substrate fixing jig was provided above the ultraviolet light source, and a transparent glass substrate was fixed to the substrate fixing jig. A hole with a diameter of 1.0 mm was drilled in a fluororesin plate to prepare a fluororesin ring. The prepared fluororesin ring was placed on a transparent glass substrate, and the perforated portion was filled with the curable artificial nail composition so that the film thickness before curing was 1.00±0.05 mm. The fluororesin ring was then covered with a light-shielding material (black aluminum foil) to prepare a sample. The sample was irradiated with ultraviolet light from the transparent glass substrate side to cure the curable artificial nail composition filled in the perforated portion of the fluororesin ring, and the maximum curing heat generated during curing was measured. Using the obtained maximum curing heat, the following formula: Temperature rise during curing (℃) = Maximum curing heat (℃) - Measurement start temperature (℃) The temperature rise during curing was calculated from the above. The evaluation results are shown in Tables 1 to 4. In the present invention, a temperature of 28.0° C. or less is acceptable.

[0079] <Machine pressure resistance evaluation> The machine pressure resistance of each of the obtained curable artificial nail compositions was evaluated as follows. The surface of the nylon plate was wiped with ethanol to remove dirt, and then the curable artificial nail composition was applied so that the film thickness after curing was 100 μm. It was cured for 30 seconds with a 32 W LED light to form a cured coating film 10 mm long and 50 mm wide. The resulting cured coating film was rubbed with a router rotating at 2500 rpm to create a smooth surface, and the cured coating film was observed and evaluated according to the following criteria. The results are shown in Tables 1 to 4. In the present invention, A is acceptable, and B and C are unacceptable. A: Smooth surfaces can be created without any problems. B: Tiny irregularities occur in unintended places. C: Bumps and recesses occur in unintended places.

[0080] [Table 1]

[0081] [Table 2]

[0082] [Table 3]

[0083] [Table 4]

[0084] In Examples 1 to 28, the curable artificial nail composition according to the present invention had a temperature rise during curing of 28.0° C. or less in all cases, and the machine pressure resistance of the cured coating film was rated A in all cases. On the other hand, in Comparative Example 1, when the composition did not contain (b1) trimethylolpropane tri(meth)acrylate and / or (b2) polypentaerythritol octa(meth)acrylate, the machine pressure resistance of the cured coating film was rated C, and when the composition contained more than the specified amount of (b1) trimethylolpropane tri(meth)acrylate and / or (b2) polypentaerythritol octa(meth)acrylate, the temperature rise during curing exceeded 28.0° C. (Comparative Examples 2 to 5), and the machine pressure resistance was rated B or C (Comparative Examples 1, 3 to 13). From this, it can be seen that the curable artificial nail composition of the present invention suppresses the temperature rise during curing and provides a cured coating film with excellent machine pressure resistance.

Claims

1. (A) a polyether-based polyurethane (meth)acrylate oligomer and / or a polycarbonate-based polyurethane (meth)acrylate oligomer, (B) a (meth)acrylate monomer, (C) a polymerization initiator, A curable artificial nail composition comprising: The (B) (meth)acrylate monomer comprises (b1) trimethylolpropane tri(meth)acrylate and / or (b2) polypentaerythritol octa(meth)acrylate, the content of the (b1) trimethylolpropane tri(meth)acrylate is more than 1.0 mass% and 17.0 mass% or less, based on 100 mass% of the total amount of the curable artificial nail composition; The content of the (b2) polypentaerythritol octa(meth)acrylate is 0.5% by mass or more and 12.0% by mass or less based on 100% by mass of the total amount of the curable artificial nail composition. The curable artificial nail composition.

2. The curable artificial nail composition satisfies the following requirement (I) or (II); Requirement (I): The weight average molecular weight of the polyether-based polyurethane (meth)acrylate oligomer and the polycarbonate-based polyurethane (meth)acrylate oligomer is 10,000 or more, and the composition is for forming a base coat layer in a gel nail. The curable artificial nail composition according to claim 1 , which satisfies the requirement (II): that it does not contain a plasticizer and is for forming a top coat layer in a gel nail.

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