hardened artificial claw components

Abstract

To provide a curable artificial nail composition that can form a cured coating with superior sticking to a substrate (both adhesion and bonding to a nail) and sustained adherence, and boasts high curability and is easy to peel off.SOLUTION: A curable artificial nail composition includes the following (A)-(C): (A) a polyurethane (meth)acrylate compound with a weight average molecular weight of 10,000 or more, (B) an ether linkage-bearing mono(meth)acrylate compound with a molecular weight of 7,000 or less, and (C) a polymerization initiator.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Nail art, which involves decorating natural fingernails and toenails, or attaching artificial nails and then decorating them, is becoming increasingly popular. Furthermore, artificial nails are being formed on top of natural nails to reinforce them and prevent breakage or peeling due to external forces. For the purpose of decorating and strengthening nails, resin-based materials, commonly known as manicures, pedicures, or sculptures, are applied to the nails.

[0003] As a material used for decorating or reinforcing nails, a curable artificial nail composition called gel nail is attracting attention. Gel nail is a curable gel-like nail coating material (curable artificial nail composition), and for example, those containing (meth)acrylate oligomers and (meth)acrylic monomers are known. Gel nail is applied to the nail and cured by ultraviolet irradiation, etc., to form a crosslinked polymer film through a radical polymerization reaction, and is said to be able to form a tough film that is difficult to peel off the nail. Until now, curable artificial nail compositions such as gel nail have mainly been studied from the perspectives of the adhesion of the cured coating film to the substrate (adhesion to the nail), adhesion durability, curability, and the aesthetic appearance of the cured coating film.

[0004] On the other hand, recently, in the field of nail decoration or reinforcement, there has been a growing demand not only for nail salons but also for self-nail care, where users perform their own nail care at home. However, conventional gel nails using hardening artificial nail compositions are difficult to remove with ordinary nail polish remover. Therefore, gel nails require advanced skills and special removers for removal, making self-nail care difficult. As a result, there has been a need for a hardening artificial nail composition that can be used as a gel nail that users can easily remove at home.

[0005] Patent Document 1 describes a photocurable nail cosmetic that can produce gel nails that can be easily repaired and removed. Patent Document 2 describes a photocurable artificial nail composition in which the cured coating film has good soak-off properties (peelability with solvent). Patent Document 3 describes a photocurable gel nail composition that can be easily peeled off after use. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2019-85394 [Patent Document 2] Japanese Patent Publication No. 2019-1750 [Patent Document 3] Japanese Patent Publication No. 2022-21394 [Overview of the project] [Problems that the invention aims to solve]

[0007] In Patent Documents 1-3, acetone was required for removing gel nails (peeling off the hardened coating). Therefore, the hurdle for doing gel nails at home remained high, and it could not be said that gel nails were easy for users to remove existing nail polish at home. In order for users to be able to remove the cured coating of a curable artificial nail composition at home, the base coat of the gel nail needs to be peelable. To make the cured coating of a curable artificial nail composition peelable, it needs to have high flexibility so that it does not tear when pulled. On the other hand, in order for a curable artificial nail composition to be suitably used as a base coat layer for gel nails, it also needs high curability and adhesion that adheres well to the nail for a long period of time. However, conventional curable artificial nail compositions have found it difficult to satisfy all three requirements: high curability, high flexibility of the cured coating, and high adhesion of the cured coating. The problem to be solved by the present invention is to form a cured coating film excellent in adhesiveness to a substrate (adhesiveness and adhesion to nails) and adhesion sustainability, having excellent curability, peel-off property and other characteristics, and to obtain a curable artificial nail composition having such characteristics.

Means for Solving the Problems

[0008] As a result of intensive studies to solve the above problems, the present inventors have found that the above problems can be solved by using a curable artificial nail composition having a specific composition, and have completed the present invention. Specifically, it is as follows. [Item 1] The following (A) to (C); (A) A polyurethane (meth) acrylate compound having a weight average molecular weight of 10,000 or more, (B) A mono (meth) acrylate compound containing an ether bond and having a molecular weight of 7,000 or less, (C) A polymerization initiator, A curable artificial nail composition containing the above. [Item 2] The curable artificial nail composition according to Item 1, wherein the above (A) is a polyether-based polyurethane (meth) acrylate compound. [Item 3] The curable artificial nail composition according to Item 1 or 2, wherein the above (B) is a mono (meth) acrylate compound having a glass transition temperature of 0°C or less of the homopolymer. [Item 4] The curable artificial nail composition according to any one of Items 1 to 3, wherein the above (B) is a mono (meth) acrylate compound having a polyalkylene alkyl ether structure in the molecule. [Item 5] The curable artificial nail composition according to any one of Items 1 to 4, wherein the elongation of the cured coating film of the curable artificial nail composition is 90% or more. [Item 6] The curable artificial nail composition according to any one of Items 1 to 5, wherein the content of the above (A) is 40% by mass or more and 95% by mass or less based on 100% by mass of the total amount of the radically polymerizable compounds in the curable artificial nail composition.

Effects of the Invention

[0009] According to the present invention, a cured coating film excellent in adhesiveness to a base material (adhesion and adhesion to nails) and adhesion persistence can be formed, and a curable artificial nail composition having excellent curability and properties such as peel-off property is provided.

Mode for Carrying Out the Invention

[0010] The curable artificial nail composition of the present invention comprises the following (A) to (C); (A) A polyurethane (meth)acrylate compound having a weight average molecular weight of 10,000 or more, (B) an ether bond-containing mono(meth)acrylate compound having a molecular weight of 7,000 or less, (C) a polymerization initiator. It is a curable artificial nail composition containing the above. The present inventor infers that when the cured coating film is stretched, the property of stretching without breaking is imparted by blending the component (A) (specific polyurethane (meth)acrylate compound) in the curable artificial nail composition of the present invention, and thus the cured coating film exhibits peel-off property. Further, the present inventor infers that by blending the component (B) (specific mono(meth)acrylate compound) in the curable artificial nail composition of the present invention, a cured coating film having high adhesiveness to a base material (adhesion and adhesion to nails) can be formed without reducing the curability (particularly, photocurability) of the curable artificial nail composition. Note that the present invention is not limited to this inference.

[0011] Hereinafter, the curable artificial nail composition containing the following (A) to (C); (A) A polyurethane (meth)acrylate compound having a weight average molecular weight of 10,000 or more, (B) An ether bond-containing mono(meth)acrylate compound having a molecular weight of 7,000 or less, (C) a polymerization initiator, will be described in detail. In this specification, (meth)acrylate means both acrylate and methacrylate.

[0012] [(A) Polyurethane (meth)acrylate compounds with a weight-average molecular weight of 10,000 or more] (A) Polyurethane (meth)acrylate compounds with a weight-average molecular weight of 10,000 or more are not particularly limited as long as they have one or more polyurethane repeating units and one or more (meth)acrylate groups in their molecule and have a weight-average molecular weight of 10,000 or more; one or more types may be used. By incorporating (A) a polyurethane (meth)acrylate compound with a weight-average molecular weight of 10,000 or more into the curable artificial nail composition of the present invention, high elongation can be imparted to the cured coating film of the curable artificial nail composition. When the cured coating film is stretched, it will not tear, thereby improving the ease of removal of the cured coating film.

[0013] In the present invention, one or more (A) urethane (meth)acrylate compounds with a weight-average molecular weight of 10,000 or more that can be used preferably have a polymer backbone (polyether, poly(meth)acrylate, polyolefin, polyester, polyurethane, polycarbonate, etc.) in addition to polyurethane repeating units and (meth)acrylate groups. Examples of polymer backbones include one or more selected from the group consisting of aliphatic polyether backbones, aromatic polyether backbones, aliphatic polycarbonate backbones, aromatic polycarbonate backbones, aliphatic polyester backbones, and aromatic polyester backbones. Among these, those having one or more aliphatic polyether backbones, aliphatic polycarbonate backbones, and aromatic polycarbonate backbones are preferred.

[0014] (A) The number of (meth)acryloyl groups contained within the molecule of a polyurethane (meth)acrylate compound with a weight-average molecular weight of 10,000 or more is not particularly limited. From the viewpoint of curability of the curable artificial nail composition and hardness of the coating film, there are one or more, preferably two or more, for example, 10 or less, preferably 8 or less. The (meth)acryloyl groups may be located at either the molecular end or the side chain of the polyurethane (meth)acrylate compound. Preferably, they are at the molecular end. 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), etc.

[0015] (A) The polyurethane (meth)acrylate compound has a weight-average molecular weight of 10,000 or more. Preferably it is 30,000 or more, and more preferably 40,000 or more. The upper limit of the weight-average molecular weight is not particularly limited, but is usually 200,000 or less, preferably 150,000 or less, more preferably 100,000 or less, and even more preferably 80,000 or less. (A) If the weight-average molecular weight of the polyurethane (meth)acrylate compound is less than 10,000, the elongation of the cured coating may be insufficient, and the cured coating may tear when removed, potentially reducing its ease of removal. Also, if the weight-average molecular weight of the polyurethane (meth)acrylate compound is large, the elongation of the cured coating may decrease, potentially reducing its tackiness.

[0016] (A) Polyurethane (meth)acrylate compounds with a weight-average molecular weight of 10,000 or more may be either commercially available or synthetically produced. (A) Examples of commercially available polyurethane (meth)acrylate compounds with a weight-average molecular weight of 10,000 or more include UA-306H, UA-306T, UA-306I, UA-510H (manufactured by Kyoeisha Chemical Co., Ltd.), RUA-071, RUA-003VE, RUA-075, RUA-048 (manufactured by Asia Chemical Industries Co., Ltd.), UV-7550B, UV-6630B, UV-7000B, UV-2000B, UV-2750B, UV-3000B, UV-3200B, UV-3300B, UV-3310B, UV-3700B, UV-6640B (manufactured by Mitsubishi Chemical Corporation), UN-9000PEP, UN-9200A, AU-2040 (manufactured by Tokushiki Co., Ltd.), KUA-PC2I, SUA One or more types selected from the group consisting of TH1, SUA TH2 (manufactured by KSM Co., Ltd.), Art Resin UN-6207, UN-6304, UN-6305, UN-350, UN-7600, UN-7700, UN-9200A, UN-5500 (manufactured by Negami Kogyo Co., Ltd.), etc., are listed, but are not limited to these.

[0017] (A) Polyurethane (meth)acrylate compounds with a weight-average molecular weight of 10,000 or more can be synthesized by reacting at least a polyol, a polyisocyanate, and a compound having a (meth)acrylate group. For example, (i) A method of reacting a polyol with a polyisocyanate to form an isocyanate group-containing urethane prepolymer, and further reacting it with a compound having an active hydrogen-containing group and a (meth)acrylate group in the molecule. (ii) A method of reacting a polyol with a polyisocyanate to form a hydroxyl group-containing urethane prepolymer, and further reacting it with a compound having an isocyanate group and a (meth)acrylate group in the molecule. It can be synthesized using methods such as those mentioned above, but this method is not the only way to do so.

[0018] Examples of polyols that can be used in the synthesis of urethane (meth)acrylate compounds include, but are not limited to, one or more selected from the group consisting of polyether polyols, polycarbonate polyols, polyester polyols, polyacrylate polyols (acrylic polyols), polyurethane polyols, polyolefin polyols, alkylene polyols, etc. Examples of polyisocyanates that can be used in the synthesis of urethane (meth)acrylate compounds include, but are not limited to, one or more selected from the group consisting of aliphatic polyisocyanates (such as hexamethylene diisocyanate), alicyclic polyisocyanates (such as isobornyl diisocyanate, bis(isocyanatomethyl)cyclohexane, dicyclohexylmethane diisocyanate, norbornane diisocyanate), aromatic polyisocyanates (such as diphenylmethane diisocyanate, toluene diisocyanate, phenylenediisocyanate), aromatic aliphatic polyisocyanates (such as xylylene diisocyanate), dimers, trimers, biuretes, allophanates, uretodiones, uretoimines, isocyanurates, oxadiazinetriones, crude compounds, etc. of these polyisocyanates. Examples of compounds having a (meth)acrylate group include, but are not limited to, one or more compounds selected from the group consisting of (meth)acrylate group-containing compounds having a group that reacts with an isocyanate group (such as a hydroxyl group, carboxyl group, amino group, or mercapto group) (e.g., hydroxyalkyl (meth)acrylate, acrylic acid, etc.) and isocyanate group-containing (meth)acrylate group-containing compounds (e.g., isocyanatoalkyl (meth)acrylate, etc.).

[0019] In the present invention, it is preferable that the polyurethane (meth)acrylate compound having a weight-average molecular weight of 10,000 or more is a polyether-based polyurethane (meth)acrylate compound. The polyether-based polyurethane (meth)acrylate compound is particularly preferably obtained from one or more polyols selected from the group consisting of polyether polyols, polycarbonate polyols, polyester polyols, and polyolefin polyols; one or more polyisocyanates selected from the group consisting of aliphatic polyisocyanates, alicyclic polyisocyanates, dimers, trimers, biuretes, allophanates, uretodiones, uretoimines, isocyanurates, oxadiazinetriones, crude compounds, etc.; and one or more compounds containing a (meth)acrylate group having a hydroxyl group.

[0020] In the curable artificial nail composition of the present invention, (A) the content of polyurethane (meth)acrylate compounds having a weight-average molecular weight of 10,000 or more is 40% by mass or more, preferably 50% by mass or more, more preferably 60% by mass or more, and 95% by mass or less, preferably 90% by mass or less, and more preferably 80% by mass or less, based on 100% by mass of the total amount of radical polymerizable compounds in the curable artificial nail composition. If the content exceeds 95% by mass, the viscosity of the curable artificial nail composition may become too high, potentially resulting in poor applicability and handling. If the content is less than 40% by mass, the viscosity of the curable artificial nail composition may become too low, potentially resulting in poor applicability and handling, and potentially making it impossible to peel off the cured coating.

[0021] [(B) Mono(meth)acrylate compounds containing ether bonds with a molecular weight of 7,000 or less] (B) The ether-bond-containing mono(meth)acrylate compounds with a molecular weight of 7,000 or less are not particularly limited as long as they have a molecular weight of 7,000 or less and contain one or more ether bonds in the molecule, and one or more types may be used. By incorporating (B) an ether-bond-containing mono(meth)acrylate compound with a molecular weight of 7,000 or less into the curable artificial nail composition of the present invention, it is possible to impart high tackiness to the cured coating film without reducing the curability of the curable artificial nail composition, thereby enabling the formation of a cured coating film with excellent tackiness to the substrate (adhesion to the nail) and adhesion durability.

[0022] The number of ether bonds contained in one or more (B) ether bond-containing mono(meth)acrylate compounds with a molecular weight of 7,000 or less that can be used in the present invention is not particularly limited. For example, it may be one or more, preferably two or more, and for example, 100 or less, preferably 50 or less, and more preferably 10 or less. (B) The number of (meth)acryloyl groups contained within the molecule of an ether-bonded mono(meth)acrylate compound with a molecular weight of 7,000 or less is one. The (meth)acryloyl group may be located at either the molecular end or the side chain of the polyurethane (meth)acrylate compound. Preferably, it is at the molecular end. 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), etc.

[0023] (B) The molecular weight of the ether-bonded mono(meth)acrylate compound with a molecular weight of 7,000 or less is preferably 5,000 or less, more preferably 3,000 or less, more preferably 1,000 or less, and even more preferably 500 or less. The lower limit of the molecular weight is not particularly limited, but is usually 100 or more, preferably 150 or more. Note that the "molecular weight" of the ether-bonded mono(meth)acrylate compound with a molecular weight of 7,000 or less in (B) refers to the weight-average molecular weight if the molecular weight exceeds 500. If the molecular weight of the ether-bonded mono(meth)acrylate compound in (B) exceeds 7,000, the adhesion of the cured coating film to the substrate may be insufficient, and the adhesion durability of the cured coating film may decrease.

[0024] (B) The ether-containing mono(meth)acrylate compound with a molecular weight of 7,000 or less may be either a commercially available product or a synthetic product. (B) Examples of ether-bonded mono(meth)acrylate compounds with a molecular weight of 7,000 or less include the following formula (1); CH2=CHR 1 -COO-(-R 2 -O-)-R 3 ...(1) (In formula (1), R 1 is a methyl group or hydrogen, R 2 R is a divalent organic group. 3 is a monovalent organic group. n is an integer of 1 or more. One or more compounds selected from the group consisting of compounds represented by ), ether (meth)acrylate oligomers, etc., are listed, but are not particularly limited.

[0025] In the compound represented by the above formula (1), R 2 This is one or more selected from optionally substituted divalent aliphatic hydrocarbon groups, optionally substituted divalent aromatic hydrocarbon groups, and optionally substituted divalent aromatic aliphatic hydrocarbon groups, and preferably one or more selected from the group consisting of optionally substituted divalent aliphatic hydrocarbon groups having 1 to 12 carbon atoms and optionally substituted divalent aromatic groups having 6 to 20 carbon atoms. In the compound represented by the above formula (1), R 3 This is one or more selected from optionally substituted monovalent aliphatic hydrocarbon groups, optionally substituted monovalent aromatic hydrocarbon groups, and optionally substituted monovalent heterocyclic groups, and preferably one or more selected from the group consisting of optionally substituted monovalent aliphatic hydrocarbon groups having 1 to 12 carbon atoms and optionally substituted monovalent aromatic groups having 6 to 20 carbon atoms. In the compound represented by formula (1) above, n is an integer of 1 or more, and the upper limit of n is 100 or less, preferably 20 or less, more preferably 10 or less, and even more preferably 6 or less.

[0026] Ether (meth)acrylate oligomers can be synthesized, for example, by adding one or more compounds selected from the group consisting of compounds having a functional group that reacts with a hydroxyl group (carboxyl group, halogen group, hydroxyl group, etc.) and a (meth)acrylate group, or (meth)acrylic acid, to the hydroxyl group of an aliphatic polyether monool or an aromatic polyether monool derived from bisphenol, etc., but the method is not limited to this.

[0027] In the present invention, ether-bonded mono(meth)acrylate compounds other than the compound represented by formula (1) and ether (meth)acrylate oligomers may be used. Examples of such ether-bonded mono(meth)acrylate compounds include alkoxylated tetrahydrofurfuryl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, (meth)acryloylmorpholine, glycidyl (meth)acrylate, 4-(meth)acryloyloxymethyl-2-cyclohexyl-1,3-dioxolane, (2-methyl-2-ethyl-1,3-dioxolane-4yl)methyl (meth)acrylate, and cyclic trimethylolpropaneformal (meth) One or more substances selected from the group consisting of acrylate, (2-isobutyl-2-methyl-1,3-dioxolan-4yl)methyl (meth)acrylate, (2-ethyl-2-methyl-1,3-dioxolan-4yl)methyl (meth)acrylate, (1,4-dioxaspiro[4,5]decane-2yl)methyl (meth)acrylate, (3-ethyloxetan-3-yl)methyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate glycidyl ether, etc., are examples, but are not particularly limited.

[0028] In the present invention, it is preferable that (B) the ether bond-containing mono(meth)acrylate compound having a molecular weight of 7,000 or less is a mono(meth)acrylate compound whose homopolymer has a glass transition temperature of 0°C or less. In the present invention, it is preferable that the (B) ether bond-containing mono(meth)acrylate compound having a molecular weight of 7,000 or less is a mono(meth)acrylate compound having a polyalkylene alkyl ether structure in the molecule. In particular, the compound represented by the formula (1) is preferable. In the formula (1), R 1 is a methyl group or hydrogen, R 2 is an alkylene group having 2 to 6 carbon atoms, R 3 is an alkyl group having 1 to 12 carbon atoms. A more preferable compound is one in which, in the formula (1), R 1 is a methyl group or hydrogen, R 2 is an alkylene group having 2 to 4 carbon atoms, R 3 is an alkyl group having 1 to 6 carbon atoms. One or more selected from the group consisting of alkyl carbitol (meth)acrylate and alkoxyalkyl (meth)acrylate are particularly preferable.

[0029] In the curable artificial nail composition of the present invention, the content of the (B) ether bond-containing mono(meth)acrylate compound having a molecular weight of 7,000 or less is 5% by mass or more, preferably 7% by mass or more, more preferably 10% by mass or more, based on 100% by mass of the total amount of the radically polymerizable compounds in the curable artificial nail composition, and is 50% by mass or less, preferably 45% by mass or less, more preferably 40% by mass or less. If the content exceeds 50% by mass, the viscosity of the curable artificial nail composition may become too low, and there is a risk that the coating property and handling property may deteriorate. If the content is less than 5% by mass, the viscosity of the curable artificial nail composition may become too high, and the adhesiveness of the cured coating film may decrease.

[0030] [(C) Polymerization initiator] (C) The polymerization initiator generates radicals when irradiated with light having a specific wavelength from a light source. For example, one or more polymerization initiators selected from the group consisting of acylphosphine oxide-based, α-hydroxyalkylphenone-based, benzoin ether-based, benzyl ketal-based, acid ester-based, α-aminoalkylphenone-based, benzophenone-based, thioxanthone-based, titanocene-based, quinone-based, etc. can be mentioned. (C) By using a polymerization initiator, good curability can be imparted to the curable artificial nail composition when light of a specific wavelength is irradiated from various light sources, including UV-LED light sources.

[0031] Of these, acylphosphine oxide polymerization initiators generate radicals when irradiated with ultraviolet light with a wavelength of 365 nm to 405 nm emitted from commonly used UV-LED light sources. Therefore, good curability can be imparted even when curing is performed by irradiating with light using various light sources, including UV-LED light sources. Furthermore, when curing is performed by irradiating with light using a UV-LED light source, yellowing of the cured coating can be prevented. Examples of acylphosphine oxide polymerization initiators 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 the like. In particular, 2,4,6-trimethylbenzoyldiphenylphosphine oxide can be preferably used because it also functions as a skin conditioning agent.

[0032] The (C) polymerization initiator of the present invention preferably includes, in addition to the acylphosphine oxide polymerization initiator, a "polymerization initiator other than the acylphosphine oxide polymerization initiator." Polymerization initiators other than acylphosphine oxide-based polymerization initiators include one or more selected from the group consisting of α-hydroxyalkylphenone-based, benzoin ether-based, benzyl ketal-based, acid ester-based, α-aminoalkylphenone-based, benzophenone-based, thioxanthone-based, titanocene-based, quinone-based, etc. For example, 2,4-diethylthioxanthone, 2-isopropylthioxanthone, thioxanthone, 2-chlorothioxanthone, isopropylthioxanthone, 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-morpholinophenone (Lu)-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, 1-(4-(phenylthio)-2,2-(O-benzoyloxime))1-hydroxycyclohexylphenyl ketone, benzoin ethyl ether, benzyl dimethyl Chilketal, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone (IRGACURE184), 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 2-hydroxy-1-{4-[4-(2-hydroxy-2-methylpropionyl)-benzyl]-phenyl}-2-methylpropan-1-one, 1-[4-(2-hydroxyethoxy)phenyl]-2-Hyd One or more substances selected from the group consisting of roxy-2-methyl-1-propan-1-one, 2-hydroxy-1-{4-[4-(2-hydroxy-2-methylpropionyl)-benzyl]phenyl}-2-methylpropane, benzophenone, 4-phenylbenzophenone, isophthalphenone, methyl phenylglyoxyate, ethylanthraquinone, phenanthrenequinone, and camphorquinone, 1-hydroxycyclohexylphenyl ketone, etc.

[0033] In the present invention, it is preferable that the polymerization initiator (C) includes an acylphosphine oxide-based polymerization initiator. Furthermore, in the present invention, it is more preferable that the polymerization initiator (C) includes both an acylphosphine oxide-based polymerization initiator and an α-hydroxyalkylphenone-based polymerization initiator.

[0034] In the curable artificial nail composition of the present invention, the content of (C) polymerization initiator is not particularly limited. It is, for example, 0.05% by mass or more, preferably 0.07% by mass or more, more preferably 0.1% by mass or more, and for example, 10.0% by mass or less, preferably 7.0% by mass or less, and more preferably 5.0% by mass or less, relative to the total amount of components of the curable artificial nail composition. If the content exceeds 10.0% by mass, the molecular weight of the cured coating film may decrease and the cured coating film may become brittle, and the cured coating film of the curable artificial nail composition may yellow. If the content is less than 0.05% by mass, the curing of the curable artificial nail composition may take a long time, and curing may be incomplete.

[0035] [(D) Other ingredients] In addition to (A) to (C) above, various other components may be added to the curable artificial nail composition of the present invention as "(D) other components" within a range that does not adversely affect viscosity, applicability, handling, and durability of the cured coating film. (D) Other components include, for example, one or more additives selected from the group consisting of radical polymerizable compounds (other than those in (A) and (B) above), colorants, polyfunctional thiol compounds, polyol compounds, fragrances, silicone-based or fluorine-based defoaming agents, silane coupling agents such as γ-glycidoxypropyltrimethoxysilane, photopolymerization accelerators such as tertiary amines, chain transfer agents, fillers, surface tension modifiers, polymerization inhibitors, flame retardants, antioxidants, ion adsorbents, stress reduction agents, preservatives, antibacterial agents, flexibility imparters, waxes, halogen trapping agents, leveling agents, wetting improvers, resin particles, decorative materials, and various other additives.

[0036] <Radical polymerizable compounds (other than those described in (A) and (B) above)> The radical polymerizable compounds (other than those described in (A) and (B) above) are not particularly limited. For example, one or more compounds selected from the group consisting of (meth)acrylate compounds, compounds having radical polymerizable unsaturated groups other than (meth)acrylate groups, etc.

[0037] ((meth)acrylate compounds) The (meth)acrylate compound is a compound having one or more (meth)acrylate groups, and is not particularly limited as long as it is not one of the compounds described in (A) and (B) above. It can be used without restriction, from low molecular weight compounds to high molecular weight compounds. The number of (meth)acrylate groups contained in one molecule is not particularly limited, but from the viewpoint of the curability of the curable artificial nail composition and the hardness of the cured coating film, it should be one or more, for example, 10 or less, preferably 8 or less, and more preferably 6 or less.

[0038] Examples of (meth)acrylate compounds include one or more (meth)acrylate compounds having one (meth)acrylate group. Examples of (meth)acrylate compounds having one (meth)acrylate 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, cyclohexyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, isobornyl (meth)acrylate, phenyl (meth)acrylate, benzyl (meth)acrylate, adamantyl (meth)acrylate, etc., and esters of monohydric alcohols with (meth)acrylic acid; acrylamide, hydroxyethyl acrylamide, dimethyl acrylamide, diethyl acrylamide, methacrylamide, N-methyl (meth)acrylamide, N-hydroxyethyl (meth)acrylamide, N-ethyl (meth)acrylamide, N-methyl (meth)acrylamide, N-hydroxyethyl (meth)acrylamide, N-methyl (meth)acrylamide, Tyrol(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-diisobutyl(meth)acrylamide, N,N-di-tert-butyl(meth)acrylamide, N,N-diheptyl(meth)acrylamide, N,N-dioctyl(meth)acrylamide, N,N-di-t (meth)acrylate group-containing amide compounds such as ert-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, and hydroxybutyl(meth)acrylate;One or more types selected from the group consisting of nitrogen-containing alkyl (meth)acrylates such as N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, and Nt-butylaminoethyl (meth)acrylate; and heterocyclic (meth)acrylates such as N-(meth)acryloyloxyethylhexahydrophthalimide, pentamethylpiperidyl (meth)acrylate, isocyanurate di(meth)acrylate, isocyanurate tri(meth)acrylate, triazine tri(meth)acrylate, N-(meth)acryloyloxysuccinimide, and N-(meth)acryloyloxyphthalimide.

[0039] Among these (meth)acrylate compounds having one (meth)acrylate group, (i) esters of monohydric alcohols 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, neopentyl (meth)acrylate, cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, etc., and (meth)acrylic acid, (ii) Hydroxyl group-containing (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and hydroxybutyl (meth)acrylate, It is preferable to select one or more from the group consisting of the following:

[0040] Examples of (meth)acrylate compounds include one or more (meth)acrylate compounds having two or more (meth)acrylate groups. Examples of (meth)acrylate compounds having two or more (meth)acrylate 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, ethoxylated propylene glycol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,9-nonanediol 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, pentaerythritol di(meth)acrylate, bisphenol A ethylene oxide modified di(meth)acrylate, ethoxylated bisphenol A di(meth)acrylate, propoxylated bisphenol A di(meth)acrylate (isopyridenediphenylbis(oxyhydroxypropyl methacrylate), etc.), the following formula [ka] Di(meth)acrylate monomers such as propoxylated bisphenol A dimethacrylate; glycerin tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, ditrimethylolpropane tri(meth)acrylate, trimethylolpropane propylene oxide modified tri(meth)acrylate, trimethylolpropane ethylene oxide modified tri(meth)acrylate, pentaerythritol tri(meth)acrylate, ε-caprolactone modified tris(acryloxyethyl) isocyanurate, and other tri(meth)acrylate monomers; pentaerythritol One or more types selected from the group consisting of: tetra(meth)acrylate monomers such as thritol tetra(meth)acrylate; polypentaerythritol(meth)acrylates such as dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, tripentaerythritol(meth)acrylate, tetrapentaerythritol(meth)acrylate; (meth)acrylate monomers having four or more (meth)acrylate groups such as ethoxylated isocyanuric acid triacrylate and ethoxylated pentaerythritol tetraacrylate; etc.

[0041] It is preferable to use one or more (meth)acrylate compounds 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, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, etc., among the (meth)acrylate compounds having two or more (meth)acrylate groups.

[0042] Examples of (meth)acrylate compounds include one or more radical polymerizable phosphoric acid compounds having an acrylate group. The radical polymerizable phosphoric acid compound having an acrylate group is not particularly limited as long as it is a radical polymerizable phosphoric acid compound having an acrylate group and a phosphoric acid group (-P(=O)(OH)2 group or -P(=O)(OH)- group) in its molecule. For example, the following formula; CH2=CH-COO-R 11 -P(=O)(OH)2 CH2=CH-COO-R 12 -P(=O)(OH)-R 13 -OCO-CH=CH2 (R in the formula 11 , R 12 and R 13 (This represents a divalent organic group.) One or more compounds selected from the group consisting of compounds represented by [formula] can be listed.

[0043] Examples of radical polymerizable phosphoric acid compounds having such acrylate groups include 2-acryloyloxyethyl phosphate, 2-acryloyloxypropyl phosphate, 2-acryloyloxybutyl phosphate, 2-acryloyloxypentyl phosphate, 2-acryloyloxyhexyl phosphate, acryloyloxyethyl valerate phosphate, acryloyloxypropyl valerate phosphate, acryloyloxybutyl valerate phosphate, acryloyloxypentyl valerate phosphate, acryloyloxyhexyl valerate phosphate, acryloyloxyethyl caproate phosphate, acryloyloxypropyl caproate phosphate, acryloyloxybutyl caproate phosphate, acryloyloxypentyl caproate phosphate, acryloyloxyhexyl caproate phosphate, and acryloyloxy phosphate. One or more compounds selected from the group consisting of ethyl phosphate, acryloyloxypropyl caprylate, acryloyloxybutyl caprylate, acryloyloxypentyl caprylate, acryloyloxyhexyl caprylate, bis(2-acryloyloxyethyl) phosphate, bis(2-acryloyloxypropyl) phosphate, bis(2-acryloyloxybutyl) phosphate, bis(2-acryloyloxypentyl) phosphate, bis(2-acryloyloxyhexyl) phosphate, acid phosphooxypolyoxyethylene glycol monoacrylate, acid phosphooxypolyoxypropylene glycol monoacrylate, ethylene oxide-modified diacrylate phosphate, propylene oxide-modified diacrylate phosphate, phosphate-modified epoxy acrylate, etc. As a radical polymerizable phosphoric acid compound having an acrylate group, for example, a radical polymerizable phosphoric acid ester compound having an acrylate group can be used.

[0044] Examples of (meth)acrylate compounds include one or more (meth)acrylate oligomers. For example, one or more selected from the group consisting of ester (meth)acrylate oligomers having ester bonds, polyurethane (meth)acrylate oligomers with a molecular weight of 7,000 or less, and epoxy (meth)acrylate oligomers with a molecular weight of more than 7,000. Ester (meth)acrylate oligomers having ester bonds can be synthesized, for example, by adding a compound having a hydroxyl group and a (meth)acrylate group, and / or an acrylic compound having a (meth)acrylic acid or a carboxyl group, to the carboxyl group and / or hydroxyl group of an ester oligomer obtained by the reaction of a polyol and a polycarboxylic acid, but the method is not limited to this. Polyurethane (meth)acrylate oligomers are the same as those described in (A) above, and include those with a molecular weight of 7,000 or less. Examples of epoxy (meth)acrylate oligomers include those obtained by reacting a bisphenol-type epoxy compound with a hydroxyalkyl (meth)acrylate, etc.

[0045] In the present invention, it is preferable to use one or more (meth)acrylate monomers selected from those having one (meth)acrylate group as the (meth)acrylate monomer. It is also preferable to use a mixture of one or more (meth)acrylate monomers having one (meth)acrylate group and one or more (meth)acrylate monomers having two or more (meth)acrylate groups.

[0046] (Compounds having radically polymerizable unsaturated groups other than (meth)acrylate groups) Examples of compounds having radically polymerizable unsaturated groups other than (meth)acrylate groups include compounds having radically polymerizable unsaturated groups (functional groups with polymerizable carbon-carbon double bonds) such as vinyl groups, vinyl ether groups, and allyl groups. Examples of such compounds include one or more selected from the group consisting of allyl glycidyl ether, styrene, α-methylstyrene, vinyltoluene, α-chlorostyrene, vinyl acetate, and the like.

[0047] The content of radical polymerizable compounds (other than those specified in (A) and (B) above) in the curable artificial nail composition of the present invention can be such that, for example, it is 50% by mass or less, preferably 35% by mass or less. Furthermore, the reactivity and curing heat of the curable artificial nail composition can be adjusted by adjusting the type and amount of radical polymerizable compounds (other than those described in (A) and (B)) contained in the curable artificial nail composition. In the present invention, as radical polymerizable compounds (other than those described in (A) and (B) above), it is preferable to use radical polymerizable monomers having functional groups such as (meth)acrylate monomers having hydroxyl groups, or (meth)acrylate compounds having a cyclic structure within the molecule such as cyclohexyl (meth)acrylate and isobornyl (meth)acrylate, in terms of the adhesion of the cured coating film of the curable artificial nail composition to the substrate (adhesion to the nail), adhesion persistence, curability, and aesthetic appearance of the cured coating film.

[0048] <Coloring agent> The coloring agent has the function of imparting a desired color tone and can be incorporated into the curable artificial nail composition in any amount. Examples of coloring agents include one or more selected from the group consisting of pigments, luminescent agents, dyes, colored resin particles, etc. In particular, one or more selected from the group consisting of inorganic pigments, luminescent agents, organic pigments, dyes, and colored resin particles used in nail coating materials, which do not significantly inhibit the curing of the curable artificial nail composition by ultraviolet irradiation (light irradiation).

[0049] 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. 202-( 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 No. 201, Orange 20 No. 3, 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 No. 106 Red No. 2, Red No. 201, Red No. 202, Red No. 203, Red No. 204, Red No. 205, Red No. 206, Red No. 207, Red No. 208, Red No. 213, Red No. 214, Red No. 215, Red No. 218, Red No. 219, Red No. 220, Red No. 221, Red No. 223, Red No. 225, Red No. 226, Red No. 227, Red No. 228, Red No. 230-(1), Red No. 230-(2), Red No. 231 One or more types selected from the group consisting of 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 dioxide, iron oxide, chromium oxide, manganese violet, carbon black, metal powder, metal flakes, metal oxide flakes, glass flakes, colored resin particles, plated resin particles, etc.

[0050] <Polyfunctional Thiol Compounds> Polyfunctional thiol compounds are incorporated into curable artificial nail compositions as curing modifiers, crosslinking agents, and viscosity modifiers. Furthermore, incorporating polyfunctional thiol compounds into curable artificial nail compositions can improve the wipeability when removing the cured coating film. Examples of polyfunctional thiol compounds include those obtained by reacting a thiol group or a compound having a group that reacts to form a thiol group with the hydroxyl group of a polyol compound such as trimethylolpropane, pentaerythritol, or dipentaerythritol. For example, one or more compounds selected from the group consisting of trimethylolpropane tris(3-mercaptopropionate), tris[(3-mercaptopropionyloxy)-ethyl]-isocyanurate, pentaerythritol tetrakis(3-mercaptobutyrate), pentaerythritol tetrakis(3-mercaptopropionate), dipentaerythritol hexakis(3-mercaptopropionate), etc. When a polyfunctional thiol compound is incorporated into a curable artificial nail composition, the amount can be, for example, 1.0% by mass or more and 10.0% by mass or less relative to the entire curable artificial nail composition.

[0051] <Polyol compounds> Polyol compounds function as diluents and adhesion enhancers for curable artificial nail compositions. Examples of polyol compounds include one or more selected from the group consisting of alkyl polyols, polyester polyols, polyether polyols, acrylic polyols, polybutadiene polyols, and phenolic polyols. Among these, alkyl polyols, polyester polyols, and polyether polyols are preferred. Examples of alkyl polyols include one or more 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.

[0052] Examples of polyester polyols include one or more selected from the group consisting of condensation-type polyester polyols, addition-polymerized polyester polyols, and polycarbonate polyols. Condensation-type polyester polyols are 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, dimer acid diol, 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 preferably have a weight-average molecular weight of 100 to 100,000. Examples of addition-polymerized polyester polyols include polycaprolactone, and preferably have a weight-average molecular weight of 100 to 100,000. Polycarbonate polyols are synthesized by methods such as direct phosgenation of polyols or transesterification with diphenyl carbonate, and their weight-average molecular weight is preferably between 100 and 100,000. Examples of polyether polyols include those obtained by ring-opening polymerization of alkylene oxides.

[0053] <Polymerization inhibitor> Polymerization inhibitors include, for example, one or more selected from the group consisting of quinone compounds, salicylic acid hydrazide, tocopherol compounds, and the like. When a polymerization inhibitor is incorporated into a curable artificial nail composition, the amount can be, for example, 500 ppm or more, preferably 1,000 ppm or more, and for example, 5,000 ppm or less, preferably 4,500 ppm or less, relative to the entire curable artificial nail composition.

[0054] [Uses and physical properties of hardened artificial nail compositions] The curable artificial nail composition of the present invention exhibits excellent curability, and its cured coating film has excellent adhesion to the substrate, maintains its adhesion to the substrate for a long period of time, and has high flexibility that prevents the coating film from tearing even when pulled. The curable artificial nail composition of the present invention is a composition for coating the surface of a nail, similar to so-called general manicures and pedicures, and may be used to coat the surface of the user's own nail, which may be made uneven by sanding as needed. It is particularly suitable for use as a gel nail, and can be used, for example, as a base coat layer applied directly to the user's nail, a color coat applied on top of the base coat layer, and a top coat layer applied on top of that. Furthermore, when used as a color coat, it can be mixed with colorants to create a wide variety of colors, including solid colors, glittery finishes, metallic finishes, dark colors, and light colors. When forming the cured coating film of the curable artificial nail composition of the present invention, equipment similar to that used for conventional radical polymerizing nail polish cured by ultraviolet light, or general ultraviolet curing equipment can be used.

[0055] The curable artificial nail composition of the present invention should have a viscosity that allows it to be sufficiently applied using an applicator such as a brush. Alternatively, it may have a viscosity that allows it to be applied by inkjet printing or the like. The curable artificial nail composition preferably has a maximum stress of 15.0 MPa or higher at the time of fracture in a tensile test of the cured coating film, more preferably 18.0 MPa or higher, and even more preferably 20.0 MPa or higher. If it is less than 15.0 MPa, it may be prone to peeling due to friction. Furthermore, it is preferable that the strain rate at the time of rupture of the cured coating film be 95.0% or higher, more preferably 97.0% or higher, and even more preferably 100.0% or higher.

[0056] [Covering of nails using a hardening artificial nail composition] The nails covered with the curable artificial nail composition of the present invention may be human fingernails or toenails, or even animal nails such as those of dogs or cats. When applying the curable artificial nail composition of the present invention to a nail or an (uncured) coating applied to a nail, sanding of the application surface is optional. The method of 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 inkjet printing can be used. The curable artificial nail composition of the present invention can be used as a base coat layer (gel base; undercoat), an intermediate layer (color layer), or a top coat layer in gel nails. In particular, it is preferable to use it as a base coat layer (gel base; undercoat) because of its excellent adhesion to the substrate. After applying the curable artificial nail composition of the present invention, it is also possible to enhance its aesthetic appeal by attaching small decorations, powders, etc., to the surface of the coating film of the curable artificial nail composition before it hardens. The curable artificial nail composition of the present invention, when used particularly for forming a base layer, can form a cured coating film that exhibits excellent adhesion to the substrate, maintains its adhesion for a long period of time, and has high flexibility that prevents tearing even when the coating film is pulled. Therefore, it is possible to provide gel nails that allow users to peel off the nails themselves.

[0057] Using the curable artificial nail composition of the present invention, a layer having the shape of a nail or the like can be created on one side of a sheet, and after bringing this layer into contact with (transferring) the nail surface, the sheet can be peeled off or, without peeling it off, cured by irradiation with ultraviolet light. By applying a layer of a curable artificial nail composition to the surface of a sheet in advance and then transferring it, it is possible to cover the surface of the nail 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.

[0058] The curable artificial nail composition can be cured after application using, for example, a known ultraviolet curing device. Although the irradiation energy required for curing varies depending on the composition of the curable artificial nail composition, the irradiation energy (integrated light dose) from the light irradiation is 5 mJ / cm². 2 Preferably 10 mJ / cm² 2 That is all, 1000 mJ / cm2 Preferably 800 mJ / cm² 2 The following applies: If the irradiation energy is within this range, nail art with sufficient adhesion and abrasion resistance can be obtained. As a light source, for example, ultraviolet light sources such as mercury lamps, metal halide lamps, ultraviolet light-emitting diodes (UV-LEDs), and ultraviolet laser diodes (UV-LDs) can be used. Among these, ultraviolet light-emitting diodes (UV-LEDs) and ultraviolet laser diodes (UV-LDs) are preferred from the viewpoint of being small, having a long lifespan, high efficiency, and low cost. [Examples]

[0059] 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, "parts" means parts by mass.

[0060] [Examples 1-5, Comparative Examples 1-7] The components shown in Table 1 were added to a container in the proportions (parts by mass) shown in Table 1, and the mixture was heated to 50°C while being stirred with a dissolver. After stirring, the mixture was allowed to stand at 80°C for 2 hours to remove air bubbles, and a curable artificial nail composition was obtained. All of these steps were carried out under light shielding conditions.

[0061] <Ingredients> The components in Table 1 are as follows: (Polyurethane (meth)acrylate) PUA1: Polyether-based polyurethane acrylate obtained from hydroxyalkyl acrylate, isophorone diisocyanate, and polyoxyalkylene glycol (weight-average molecular weight 70,000) PUA2: Polyether-based polyurethane acrylate obtained from hydroxyalkyl acrylate, isophorone diisocyanate, and polyoxyalkylene glycol (weight-average molecular weight 50,000) PUA3: Polyether-based polyurethane acrylate obtained from hydroxyalkyl methacrylate, isophorone diisocyanate, and polyoxyalkylene glycol (weight-average molecular weight 7,000) PUA4: Polyurethane acrylate obtained from hydroxyalkyl acrylate, isophorone diisocyanate, and alkylenediol (weight-average molecular weight 3,000)

[0062] ((meth)acrylate compounds) EEEA: Ethoxyethoxyethyl acrylate (homopolymer Tg: -67℃) 2-MTE: 2-methoxyethyl acrylate (homopolymer Tg: -50℃) TEGDMA: Tetraethylene glycol dimethacrylate IBXA: Isobornyl acrylate (homopolymer Tg: 97℃) HEMA: 2-hydroxyethyl methacrylate (homopolymer Tg: 55℃) HBMA: 2-Hydroxybutyl methacrylate BA: Butyl acrylate (homopolymer Tg: -55℃)

[0063] (Polymerization initiator) TPO:2,4,6-trimethylbenzoyldiphenylphosphine oxide HCHPK: 1-Hydroxycyclohexyl phenyl ketone

[0064] <Rating> (sticky) A curable artificial nail composition was applied to a vinyl chloride board. A 30W LED light was irradiated for 30 seconds to create a cured coating film with a thickness of 200 μm and a size of 2 cm x 5 cm. After that, the uncured components were wiped off with ethanol. A polyvinyl chloride film of the same size was placed on top of the cured coating, and a load of 500 gf was applied to press it down and prepare a test specimen. The polyvinyl chloride film was peeled from the test specimen at a 90° angle at a tensile speed of 200 mm / min, and the measured force was defined as the adhesive strength (N). Based on the measured adhesive strength, a rating of A was assigned to adhesive strengths of 5N or higher, and a rating of C was assigned to adhesive strengths of less than 5N. The results are also shown in Table 1. In this invention, a tackiness of 5N or higher is considered satisfactory because it provides sufficient tackiness (adhesion to the nail) necessary for gel nails.

[0065] (Coating film elongation) A curable artificial nail composition was applied to a weighing paper, and a 30W-LED light was irradiated for 30 seconds to create a cured coating film with a thickness of 1 mm and a size of 1 cm x 5 cm. After that, the uncured components were wiped off with ethanol. The cured coating film was fixed at both ends in the longitudinal direction (1 cm) and stretched at a speed of 200 mm / min. The elongation (%) of the coating film upon breakage was measured. Based on the measured elongation, a rating of A was assigned for elongation of 100% or more, a rating of B for elongation between 50% and 100%, and a rating of C for elongation less than 50%. The results are shown in Table 1. In this invention, a coating elongation of 50% or more was evaluated as acceptable because the gel nail (gel nail base coat) exhibited good peel-off functionality. However, from the viewpoint of peel-off functionality, a coating elongation of 100% or more is more preferable.

[0066] [Table 1]

[0067] From Examples 1-5 and Comparative Examples 1-2 in Table 1, it can be seen that when the weight-average molecular weight of (A) polyurethane (meth)acrylate compound is 10,000 or more, a curable artificial nail composition with excellent adhesiveness and film elongation can be obtained, whereas when the weight-average molecular weight of (A) polyurethane (meth)acrylate compound is less than 10,000, a curable artificial nail composition with inferior adhesiveness and film elongation can be obtained. From Examples 1 to 5 and Comparative Example 3 in Table 1, it can be seen that when (B) an ether-bonded (meth)acrylate compound with a molecular weight of 7,000 or less contains one (meth)acrylate group, a curable artificial nail composition with excellent tackiness and film elongation can be obtained, whereas when (B) an ether-bonded (meth)acrylate compound with a molecular weight of 7,000 or less contains two or more (meth)acrylate groups, a curable artificial nail composition with inferior film elongation is obtained. From Examples 1-5 and Comparative Examples 4-7 in Table 1, it can be seen that when (B) an ether-bonded (meth)acrylate compound with a molecular weight of 7,000 or less contains one (meth)acrylate group, a curable artificial nail composition with excellent adhesion and film elongation can be obtained, whereas when (B) an acrylate compound with a molecular weight of 7,000 or less does not have an ether bond, a curable artificial nail composition with inferior adhesion and / or film elongation is obtained.

Claims

1. (A) to (C) below: (A) Polyurethane (meth)acrylate compounds with a weight-average molecular weight of 10,000 or more, (B) Mono(meth)acrylate compounds containing ether bonds with a molecular weight of 7,000 or less, (C) Polymerization initiator, Includes, The above (A) is a polyether-based polyurethane (meth)acrylate compound, The above (B) is a mono(meth)acrylate compound having a glass transition temperature of 0°C or less, and is one or more selected from the group consisting of alkylcarbitol (meth)acrylates and alkoxyalkyl (meth)acrylates. The content of (A) is 40% by mass or more and 95% by mass or less, based on 100% by mass of the total amount of radical polymerizable compounds in the curable artificial nail composition. The content of (B) is 7% by mass or more and 50% by mass or less, based on 100% by mass of the total amount of radical polymerizable compounds in the curable artificial nail composition. Curable artificial nail composition.

2. The curable artificial nail composition according to claim 1, wherein the elongation of the cured coating film of the curable artificial nail composition is 90% or more.

Images