JP7199693B2 - Photo-curing nail cosmetic - Google Patents

Description

TECHNICAL FIELD The present invention relates to a photocurable nail cosmetic and a gel nail, nail sheet and nail tip obtained by curing the same.

With the increasing popularity of nail art, such as decorating nails with small artificial gems, drawing patterns, applying stickers, and wearing false nails, nail cosmetics and nail art techniques using them are rapidly gaining popularity. has developed into Conventional nail cosmetics are typically manicures and enamels composed of nitrocellulose, alkyd resins, and solvents such as ethyl acetate and butyl acetate. The film is formed by applying three layers in the order of the top coat (top layer), but because it uses an organic solvent, it takes a long time to dry and the inside is difficult to dry, making thick coating difficult. there were. Furthermore, since organic solvents such as acetone, ethyl acetate, and butyl acetate are used as peeling agents for the peeling work (off) of the film accompanying nail growth, the organic solvent can be removed by direct inhalation by the user or absorption through the skin. There is a risk of health hazards such as poisoning.

In recent years, nail cosmetics using a photocurable resin composition called gel nails have attracted attention because they do not contain organic solvents, can be cured in a short time, and are excellent in thick coating and gloss. rice field. Gel nails are mainly composed of polymers or oligomers, monomers and photoinitiators, which are applied to the nail surface and cured by irradiation with an ultraviolet (UV) exposure machine or a light emitting diode (LED) exposure machine as a light source. Form a film.

As nail cosmetics for gel nails, those described in Patent Documents 1 to 5 are known. Patent Document 1 proposed an artificial nail composition characterized by containing a polyfunctional urethane (meth)acrylate oligomer, a radically polymerizable monomer and a photopolymerization initiator. Further, Patent Document 2 proposes an artificial nail composition characterized by containing a polyurethane (meth)acrylate having a weight average molecular weight of 8,000 or more, a radically polymerizable monomer, and a photopolymerization initiator. These compositions are reported to have excellent applicability and stability over time, and the resulting artificial nails have good durability. A method of contacting with an acidic aqueous solution for removal has been proposed, and there is a risk of health hazards due to the organic solvent and acid of the user.

Patent Document 3 is characterized by containing hydroxyethylacrylamide as essential component 1 and at least one compound selected from the group consisting of dimethylacrylamide, diethylacrylamide, acryloylmorpholine and butoxydiethylglycol methacrylate as essential component 2. A nail cosmetic was proposed. Further, in Patent Document 4, at least one compound selected from the group consisting of methacrylamide as essential component 1 and isobornyl methacrylate, dimethylacrylamide, diethylacrylamide, acryloylmorpholine and butoxydiethylglycol methacrylate as essential component 2 is used. A nail cosmetic has been proposed, characterized in that it comprises: It has been reported that these nail cosmetics are excellent in adhesiveness of cured products and also excellent in releasability (removability). However, in terms of removability, the removal method proposed in these documents is still a method of swelling with an organic solvent and then rubbing off with a stick. Moreover, in some cases, the swelling and rubbing cycles described above are required two or three times until the nail polish is completely removed.

In addition, the methods of using the nail cosmetics proposed in these Patent Documents 1 to 4 are all the formation of a base layer (base layer), and a top layer that requires higher performance such as glossiness, scratch resistance, and durability. It was not mentioned that it was used as a gel nail, nor that it was used as a one-liquid type gel nail that could serve as a base layer, an intermediate layer, and a top layer.

On the other hand, Patent Document 5 proposed a photocurable artificial nail composition, ie, a one-liquid type gel nail, which can be used as a base layer, an intermediate layer, and a top layer. This composition contains a urethane (meth)acrylate oligomer with a weight average molecular weight of 1,000 or less, a hydroxyl group-containing (meth)acrylate monomer, and a photopolymerization initiator, and is characterized by having sufficient curability even with visible light. However, uncured monomers and the like remain on the surface of the film after curing, and it was necessary to wipe them off in order to obtain luster (glossiness). Even if oligomers and monomers with low skin irritation are used, these chemical substances may be harmful to the human body, such as neurotoxicity and carcinogenicity. There was a risk. Furthermore, no mention was made of the removal method or removability of gel nails after curing.

JP 2017-141176 A JP 2017-141177 A WO2016/194730 WO2016/194732 JP 2017-171633 A

It is an object of the present invention to provide a photocurable nail cosmetic which is excellent in applicability, curability, safety and storage stability and which can be used as a base layer, an intermediate layer, a top layer or a one-liquid type gel. Make it an issue. The present invention also provides a gel nail, a nail sticker and a nail tip which are obtained by coating, laminating and curing the photo-curable nail cosmetic composition, which has both flexibility and toughness, and which can be easily repaired and removed. is the subject.

As a result of intensive research to solve the above problems, the present inventors have found that by containing polyurethane (A) having a (meth)acrylamide group as an essential component, it is possible to improve applicability, curability, safety and storage stability. The inventors have found a photocurable nail cosmetic having excellent properties, and a gel nail, nail seal and nail tip obtained by curing the nail cosmetic and having both flexibility and toughness, and have completed the present invention.

（１０）エチレン性不飽和基を有する化合物（Ｂ）は、Ｎ，Ｎ－ジメチル(メタ)アクリルアミド、Ｎ，Ｎ－ジエチル(メタ)アクリルアミド、Ｎ－イソプロピル(メタ)アクリルアミド、Ｎ，Ｎ－ジメチルアミノプロピル（メタ）アクリルアミド、Ｎ－ヒドロキシエチル（メタ）アクリルアミド、Ｎ－メチル－Ｎ－ヒドロキシエチル（メタ）アクリルアミド、Ｎ－(メタ)アクリロイルモルフォリン、ダイアセトン（メタ）アクリルアミド、Ｎ－ビニルピロリドン、Ｎ－ビニルカプロラクタム、メトキシブチル(メタ)アクリルアミドからなる群より選択される１種以上の化合物であることを特徴とする前記（１）～（９）のいずれか一項に記載の光硬化性爪化粧、
（１１）更に光重合開始剤（Ｃ）０．１～１０質量％を有することを特徴とする前記（１）～（１０）のいずれか一項に記載の光硬化性爪化粧料、
（１２）前記（１）～（１１）に記載の光硬化性爪化粧料を光により硬化して得られることを特徴とするジェルネイル、
（１３）基材上に前記（１）～（１１）に記載の光硬化性爪化粧料を塗装した後、光により硬化して形成されることを特徴とするネイルシール、
（１４）基材上に前記（１）～（１１）に記載の光硬化性爪化粧料を塗装した後、光により硬化して形成されることを特徴とするネイルチップ
を提供するものである。
That is, the present invention provides (1) a photocurable nail cosmetic containing a polyurethane (A) having a (meth)acrylamide group (2) the polyurethane (A) having a (meth)acrylamide group has at least a polycarbonate skeleton and a polyolefin skeleton. The photocurable nail cosmetic composition according to (1) above, characterized by having one or more skeletons selected from and having one or more (meth)acrylamide groups,
(3) The photocurable composition according to (1) or (2) above, wherein the polyurethane (A) having a (meth)acrylamide group has a number average molecular weight in the range of 1,000 to 1,000,000 . nail cosmetics,
(4) The photocurable nail cosmetic composition according to any one of (1) to (3) above, which contains 1.0% by mass or more of polyurethane (A) having a (meth)acrylamide group. ,
(5) The photocurable nail makeup according to any one of (1) to (4) above, characterized by containing 1.0 to 60% by mass of polyurethane (A) having a (meth)acrylamide group. fee,
(6) The compound (B) having an ethylenically unsaturated group (excluding (A)) according to any one of (1) to (5), characterized by containing 5 to 99% by mass. photocurable nail cosmetics,
(7) The compound (B) having an ethylenically unsaturated group has, as the unsaturated group, a (meth)acrylate group, a (meth)acrylamide group, a vinyl group, a vinyl ether group, a methyl vinyl ether group, an allyl group, and a (meth)allyl ether The photocurable nail cosmetic composition according to (6) above , which is a functional group having one or more unsaturated bonds selected from the group consisting of groups and maleimide groups;
(8) The compound (B) having an ethylenically unsaturated group is one or more compounds selected from the group consisting of methacrylate-based monomers, acrylate-based monomers, methacrylamide-based monomers, and acrylamide-based monomers. The photocurable nail cosmetic according to any one of (6) or (7) above,
(9) The compound (B) having an ethylenically unsaturated group is represented by the general formula [1] (wherein R1 represents a hydrogen atom or a methyl group; R2 and R3 are each independently a hydrogen atom and have 1 to 18 carbon atoms Linear or branched alkyl groups, alkyl ether groups, alicyclic hydrocarbons and aromatic hydrocarbons, alkoxy groups introduced with linear, branched, or cyclic alkyl groups having 1 to 6 carbon atoms , hydroxyalkyl group, 4-hydroxyphenyl group, alkylsulfonic acid group, aminoalkyl group, N′-alkylaminoalkyl group, N′,N′-dialkylaminoalkyl group, and R2 and R3 It represents a saturated 5- to 7-membered ring (including those having an oxygen atom) formed together with a supported nitrogen atom. ) N-substituted (meth)acrylamide and N,N-disubstituted (meth)acrylamide, diacetone (meth)acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam one or more selected from the group The photocurable nail cosmetic according to any one of (6) to (8) , which is a compound,

(10) The compound (B) having an ethylenically unsaturated group is N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N,N-dimethylamino Propyl (meth)acrylamide, N-hydroxyethyl (meth)acrylamide, N-methyl-N-hydroxyethyl (meth)acrylamide, N-(meth)acryloylmorpholine, diacetone (meth)acrylamide, N-vinylpyrrolidone, N - The photocurable nail makeup according to any one of the above (1) to (9) , which is one or more compounds selected from the group consisting of vinylcaprolactam and methoxybutyl (meth)acrylamide. ,
(11) The photocurable nail cosmetic composition according to any one of (1) to (10), further comprising 0.1 to 10% by mass of a photopolymerization initiator (C).
(12) A gel nail obtained by curing the photocurable nail cosmetic composition according to (1) to (11) with light,
(13) A nail seal characterized by being formed by applying the photocurable nail cosmetic composition according to any one of (1) to (11) above to a base material and then curing it with light.
(14) A nail tip is formed by coating the photocurable nail cosmetic composition according to any one of (1) to (11) above on a base material, and then curing the composition with light. .

According to the present invention, by containing a polyurethane (A) having a (meth)acrylamide group, it is possible to obtain a nail cosmetic having excellent coatability, curability, safety and storage stability and excellent photocurability. Also, by photocuring the cosmetic, a gel nail, a nail sticker, and a nail that have good hardness, scratch resistance, durability, flexibility and toughness, and can be easily repaired and removed. can get chips.

The present invention will be described in detail below.
The polyurethane (A) having a (meth)acrylamide group used in the present invention preferably has one or two skeletons selected from a polycarbonate skeleton and a polyolefin skeleton, and has one or more (meth)acrylamide groups. Polyurethane oligomers and/or polymers having

A polycarbonate skeleton and a polyolefin skeleton can be obtained by reacting a polyol having each skeleton with a polyisocyanate and a compound having a (meth)acrylamide group. Polyols include polyethylene polyol, polypropylene polyol, poly 1,2-butadiene polyol, hydrogenated 1,2-polybutadiene polyol, poly 1,4-butadiene polyol, hydrogenated 1,4-polybutadiene polyol, polyisoprene polyol, hydrogenated polyolefin polyols such as polyisoprene polyol; and polycarbonate polyols composed of a polyol having a linear, branched or cyclic aliphatic hydrocarbon or heterocyclic skeleton having 1 to 12 carbon atoms and a carbonic acid diester. One type may be used alone, or two or more types may be used in combination. In addition, polyols, polyether polyols, polyester polyols, types having hydroxyl groups introduced into the silicone skeleton, hydroxyl group-containing (meth ) One or more polyols obtained by copolymerizing acrylates and other (meth)acrylic esters may be used in combination.

The polyisocyanate includes polyisocyanate compounds having two or more isocyanate groups in one molecule, specifically trimethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, 1,2-propylene diisocyanate. , 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate and other aliphatic isocyanates 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate, 2,4-diphenylmethane diisocyanate, xylylene diisocyanate cyclopentylene diisocyanate, cyclohexylene diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, methylcyclohexylmethane diisocyanate, 2,5-norbornane diisocyanate, 2,6-norbornane diisocyanate and other alicyclic Group isocyanates, or their adduct type, isocyanurate type, burette type and other multimers.

Compounds having a (meth)acrylamide group include N-hydroxy-N-methyl(meth)acrylamide, N-hydroxy-N-ethyl(meth)acrylamide, N-hydroxy-N-normal-propyl(meth)acrylamide, N- Hydroxy-N-isopropyl (meth)acrylamide, N-hydroxy-N-butylacrylamide, hydroxyethylacrylamide, hydroxypropyl (meth)acrylamide, hydroxybutyl (meth)acrylamide, isocyanatoethyl (meth)acrylamide, isocyanatopropyl (meth)acrylamide ) acrylamide, isocyanatobutyl (meth)acrylamide and the like, but hydroxyethylacrylamide is preferred from the viewpoint of safety and ease of procurement.

Polyurethanes having (meth)acrylamide groups tend to form intramolecular and/or intermolecular hydrogen bonds between amide groups or between amide groups and urethane groups, and the formed hydrogen bonds are reversible. It is possible to bind and dissociate dynamically, thereby forming a ladder (zipper) crosslinked region. The present inventors speculate that the formation of such a structure is the reason why a nail cosmetic having excellent photocurability and a cured film (gel nail) having good surface hardness can be obtained. In addition, a material having both flexibility and toughness can be obtained as a result of the synergistic effect of interaction with a polycarbonate skeleton that can impart flexibility and a polyolefin skeleton, and has the good curability, surface hardness, scratch resistance, and durability of the present invention. , gel nails, nail seals and nail tips that can be suitably used as hard gels or soft gels and that can be easily repaired and removed can be obtained. Further, these (meth)acrylamide group-containing polyurethanes (A) may be used singly or in combination of two or more.

The (meth)acrylamide group-containing polyurethane (A) used in the present invention has one or more (meth)acrylamide groups. The (meth)acrylamide group is a methacrylamide group and an acrylamide group, and the number of these functional groups (number of functional groups) contained per molecule is preferably 1 to 10, and more preferably 2 to 6. . If the number of functional groups is less than 1, there is a problem that the photocurability and the surface hardness and strength of the cured film are lowered due to the presence of the non-polymerizable compound. As a result, there is a risk of burns due to the heat of polymerization that is generated in large amounts when the nail polish is applied directly to the user's own nail to form a gel nail.

The number average molecular weight of the (meth)acrylamide group-containing polyurethane (A) used in the present invention is preferably in the range of 1,000 to 1,000,000, and in the range of 3,000 to 500,000. and most preferably in the range of 3,200 to 100,000. If the molecular weight is less than 1,000, the toughness of the resulting cured film is insufficient and it is likely to crack. On the other hand, if the molecular weight exceeds 1,000,000, the viscosity of the photocurable nail cosmetic composition will increase, and there is a possibility that the applicability will not be sufficiently satisfactory.

The content of the (meth)acrylamide group-containing polyurethane (A) used in the present invention is preferably 1% by mass or more. If it is less than 1% by mass, sufficient toughness and flexibility cannot be imparted, the cured film is likely to crack, and high curing shrinkage creates a gap between the cured film (gel nail) and the skin, resulting in a cured film. There is a risk that the curl of the nail may deform the natural nail. Furthermore, depending on the molecular weight and the number of functional groups of polyurethane (A) having (meth)acrylamide groups, it can be used as it is (100%) as a photocurable nail cosmetic. In addition, other components can be added according to the purpose of improving adhesion when used as a base coat, improving miscibility with pigments when used as a color coat, and imparting gloss when used as a top coat. When used in combination with other components, the content of the (meth)acrylamide group-containing polyurethane (A) is preferably 1 to 60% by mass.

A compound (B) having an ethylenically unsaturated group can be blended as another component used in combination with the polyurethane (A) having a (meth)acrylamide group. The compound (B) (excluding (A)) having an ethylenically unsaturated group used in the present invention includes a monofunctional unsaturated compound (b1) and a bifunctional or higher unsaturated compound (polyfunctional unsaturated compound) ( b2). Depending on the molecular weight of (A) and the number of (meth)acrylamide groups contained, only (b1) may be used as the compound (B) having an ethylenically unsaturated group, but (b1) and (b2) are used in combination. Thereby, the hardness and durability of the resulting cured product can be further improved. Also, the content of the compound (B) having an ethylenically unsaturated group is preferably 5 to 99% by mass with respect to the entire photocurable nail cosmetic (D). If the content of (B) is within this range, a cured film with well-balanced surface hardness, flexibility, and toughness can be obtained by adjusting the compounding ratio with (A).

The monofunctional unsaturated compound (b1) is not particularly limited as long as it is a monomer having one ethylenically unsaturated group in the molecule. In addition, the ethylenically unsaturated group is not particularly limited as long as it has radical polymerizability, and specifically includes a (meth) acrylate group, a (meth) acrylamide group, a vinyl group, a vinyl ether group, a methyl vinyl ether group, an allyl group, ( meth)allyl ether group, maleimide group, α-substituted maleimide group, α,β-substituted maleimide group and the like. The content of (b1) is preferably 50 to 100% by mass based on the total amount of (B). By blending in this proportion, the surface hardness, glossiness and flexibility of the photocured film obtained are good, and the durability and removability of the formed gel nail, nail sheet, and nail tip can be improved. .

Among the monofunctional unsaturated compounds (b1), the compound containing a (meth)acrylate group includes, for example, (meth)acrylic acid, and a linear, branched, or cyclic alkyl group having 1 to 22 carbon atoms. Alkyl (meth)acrylates, hydroxyalkyl (meth)acrylates into which linear, branched, or cyclic hydroxyalkyl groups having 1 to 18 carbon atoms are introduced, (meth)acrylic acid and hydroxyalkylcarboxylic acids (meth) (Meth)acrylate alkyl carboxylic acids such as ethyl acrylate carboxylic acid, ethyl (meth)acrylate succinate, ethyl (meth)acrylate phthalate, ethyl (meth)acrylate hexahydrophthalate, and having 1 to 18 carbon atoms Alkyl (meth)acrylates with linear, branched or cyclic alkylsulfonic acid groups introduced, C 1-18 alkyl (meth)acrylates with linear, branched or cyclic alkyl phosphate groups introduced Phosphoric acids, alkoxyalkylene glycol (meth)acrylates, alkoxydialkyleneglycol (meth)acrylates, alkoxytri Alkylene glycol (meth)acrylates, alkoxypolyalkylene glycol (meth)acrylates, and phenoxyalkylene glycol (meth)acrylates and phenoxydialkylenes into which a functional group consisting of a phenoxy group and an alkylene glycol group having 1 to 4 carbon atoms is introduced. Glycol (meth)acrylates, phenoxytrialkyleneglycol (meth)acrylates, phenoxypolyalkyleneglycol (meth)acrylates, N-alkylamino (meth)acrylates introduced with an aminoalkyl group having 1 to 6 carbon atoms, , N-alkylaminoalkyl (meth)acrylates introduced with an N-alkylaminoalkyl group consisting of an aminoalkyl group having 1 to 6 carbon atoms and an alkyl group having 1 to 6 carbon atoms, and N,N-dialkylaminoalkyl (meth)acrylates introduced with an N,N-dialkylaminoalkyl group consisting of an aminoalkyl group and an alkyl group having 1 to 6 carbon atoms, benzyl (meth)acrylate, phenoxyethyl (meth) Acrylate, dicyclopentanyl (meth)acrylate, dicyclopentanyloxyethyl (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentenyl (meth)acrylates into which a cyclic structure is introduced such as nyloxyethyl (meth)acrylate, bornyl (meth)acrylate, isobornyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, 2-methyl-2-adamantyl (meth)acrylate, etc. , glycidyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate glycidyl ether, and other epoxy group-introduced (meth)acrylates.

Among the monofunctional unsaturated compounds (b1), compounds containing a (meth)acrylamide group include (meth)acrylamide, mono- or disubstituted (meth)acrylamide, (meth)acryloylmorpholine and the like, and Mono- or di-substituted (meth)acrylamides include, for example, N-alkyl (meth)acrylamides, N,N-dialkyl (meth)acrylamides, carbon N-hydroxyalkyl (meth)acrylamide, N,N-di(hydroxyalkyl)(meth)acrylamide, N-hydroxyalkyl-N-(4-hydroxy Phenyl)(meth)acrylamide, N-alkyl-N-hydroxyalkyl(meth)acrylamide introduced with a hydroxyalkyl group having 1 to 6 carbon atoms and an alkyl group having 1 to 6 carbon atoms, N-alkyl-N- (4-hydroxyphenyl)(meth)acrylamide, 4-hydroxyphenyl(meth)acrylamide, N,N-di(4-hydroxyphenyl)(meth)acrylamide, an alkoxy group having 1 to 6 carbon atoms and 1 carbon atom N-alkoxyalkyl (meth)acrylamide, N,N-di(alkoxyalkyl)(meth)acrylamide, alkoxy group having 1 to 6 carbon atoms and 1 to 6 carbon atoms introduced with alkoxyalkyl group consisting of ~6 alkylene groups alkoxyalkyl group consisting of 6 alkylene groups, N-alkyl-N-alkoxyalkyl (meth)acrylamide introduced with an alkyl group having 1 to 6 carbon atoms, N introduced with an alkylsulfonic acid group having 1 to 6 carbon atoms -Sulfoalkylacrylamide, N-alkylamino (meth)acrylamide introduced with an aminoalkyl group having 1 to 6 carbon atoms, N- consisting of an aminoalkyl group having 1 to 6 carbon atoms and an alkyl group having 1 to 6 carbon atoms N-alkylaminoalkyl (meth)acrylamide having an alkylaminoalkyl group introduced therein, N having an N,N-dialkylaminoalkyl group consisting of an aminoalkyl group having 1 to 6 carbon atoms and an alkyl group having 1 to 6 carbon atoms. , N-dialkylaminoalkyl (meth)acrylamide and the like.

Further, the monofunctional unsaturated compound (b1) contains a (meth)acrylamide group, such as N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N,N-dimethylaminopropyl (meth)acrylamide, N-hydroxyethyl (meth)acrylamide, N-methyl-N-hydroxyethyl (meth)acrylamide, N-(meth)acryloylmorpholine, diacetone (meth)acrylamide, Methoxybutyl (meth)acrylamide is more preferred because it has good adhesion to the user's own nail and plastic substrate.

Among the monofunctional unsaturated compounds (b1), examples of compounds containing a vinyl group include carboxylic acid vinyl esters obtained by introducing a carboxylic acid having 1 to 22 carbon atoms, linear, branched, and cyclic compounds having 1 to 22 carbon atoms. alkyl vinyl ether, vinyl chloride, N-vinylpyrrolidone, N-vinylcaprolactam, N-vinyloxazoline, maleic acid, maleic anhydride, fumaric acid, itaconic acid, itaconic anhydride, having 1 to Maleic acid monoalkyl ester, maleic acid dialkyl ester, maleic acid monoalkylamide, maleic acid dialkylamide, maleic acid alkylimide, fumaric acid monoalkyl ester, dialkyl fumaric acid into which a linear, branched, or cyclic alkyl group of 22 is introduced ester, fumaric acid monoalkylamide, fumaric acid dialkylamide, itaconic acid monoalkyl ester, itaconic acid dialkyl ester, itaconic acid monoalkylamide, itaconic acid dialkylamide, itaconic acid alkylimide, vinyl carboxylic acid, vinyl sulfonic acid, vinyl phosphoric acid etc.

Among the monofunctional unsaturated compounds (b1), the compound containing an allyl group includes a carboxylic acid allyl ester obtained by introducing a carboxylic acid having 1 to 22 carbon atoms, a linear, branched, or cyclic compound having 1 to 22 carbon atoms. alkyl allyl ethers, phenyl allyl ethers, alkylphenyl allyl ethers, allyl amines, branched or cyclic alkyl group-introduced mono- or di-alkyl allyl amines.

Among the monofunctional unsaturated compounds (b1), the compound containing a maleimide group includes N-alkylmaleimide, N-alkyl-α- methylmaleimide, N-alkyl-α-ethylmaleimide, N-alkyl-α,β-dimethylmaleimide, N-alkyl-α-phenylmaleimide, linear, branched or cyclic hydroxyalkyl groups having 1 to 12 carbon atoms; introduced N-hydroxyalkyl-maleimide, N-hydroxyalkyl-α-methylmaleimide, N-hydroxyalkyl-α-ethylmaleimide, N-hydroxyalkyl-α,β-dimethylmaleimide, N-hydroxyalkyl-α-phenylmaleimide, An alkoxysilane compound having a maleimide group, a carboxylic acid compound having a maleimide group, and the like can be mentioned.

In the compound (B) having an ethylenically unsaturated group used in the present invention, from the viewpoint of safety such as skin irritation and odor, the monofunctional unsaturated compound (b1) is a methacrylate-based monomer, a methacrylamide-based monomer and acrylamide. system monomers are preferable, and acrylamide-based monomers are more preferable from the viewpoint of curability. Furthermore, it is most preferable to use acrylamide-based monomers and methacrylate-based monomers together in order to control the amount of heat generated during curing.

These monofunctional unsaturated compounds (b1) may be used singly or in combination of two or more.

The polyfunctional unsaturated compound (b2) is not particularly limited as long as it is a monomer or oligomer having two or more ethylenically unsaturated groups in the molecule. In addition, the ethylenically unsaturated group is not particularly limited as long as it has radical polymerizability, and specifically includes a (meth) acrylate group, a (meth) acrylamide group, a vinyl group, a vinyl ether group, a methyl vinyl ether group, an allyl group, ( meth)allyl ether group and the like. Moreover, these ethylenically unsaturated groups may have two or more of the same functional groups in the molecule, or may be a combination of two or more arbitrarily selected different functional groups. The content of (b2) is preferably 0 to 50% by mass based on the total amount of (B). If the content of (b2) exceeds 50% by mass based on the total amount of (B), the viscosity of the prepared photocurable nail cosmetic composition is high, and the coating properties and adhesion to the nail surface may not be sufficiently satisfied. have a nature. Also. The resulting photocured film has insufficient flexibility, and the resulting gel nails, nail sheets, and nail tips are prone to cracking, resulting in insufficient durability.

Among the polyfunctional unsaturated compounds (b2), for example, (di)ethylene glycol di(meth)acrylate, (tri)propylene glycol di(meth)acrylate, ditetraethylene glycol di(meth)acrylate, polyalkylene (carbon Numbers 1-4) Glycol di(meth)acrylate, polytetramethylene glycol di(meth)acrylate, 1,3 (or 1,4)-butanediol di(meth)acrylate, 1,6-hexanediol di(meth) Acrylates, cyclohexanedimethanol di(meth)acrylates, acrylate esters (dioxane glycol diacrylate), alkoxylated (cyclo)hexanediol di(meth)acrylates, epoxy di(meth)acrylates, dicyclopentanyl di(meth)acrylates, caprolactone modified dicyclopentenyl di(meth)acrylate, tricyclodecanedimethanol di(meth)acrylate, polyester di(meth)acrylate, ethylene oxide-modified bisphenol A di(meth)acrylate, propylene oxide-modified bisphenol A di(meth)acrylate, Polyurethane di(meth)acrylate, allyl(meth)acrylate, methylenebis(meth)acrylamide, ethylenebis(meth)acrylamide, polyurethane di(meth)acrylamide, allyl(meth)acrylamide, pentaerythritol tri(meth)acrylate, pentaerythritol tetra (meth)acrylate, trimethylolethane tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, tri(meth)acryloyloxyethoxytrimethylolpropane, glycerin polyglycidyl ether poly(meth)acrylate, isocyanurate ethylene oxide-modified tri(meth)acrylate, Ethylene oxide-modified dipentaerythritol penta(meth)acrylate, ethylene oxide-modified dipentaerythritol hexa(meth)acrylate, ethylene oxide-modified pentaerythritol tri(meth)acrylate, ethylene oxide-modified pen Taerythritol tetra(meth)acrylate, succinic acid-modified pentaerythritol tri(meth)acrylate, and the like. These polyfunctional unsaturated compounds (b2) may be used singly or in combination of two or more.

The photocurable nail cosmetic composition (D) of the present invention can be sufficiently cured by visible light or ultraviolet irradiation. Although it is usually necessary to contain a photopolymerization initiator, the unsaturated group of the compound (B) having an ethylenically unsaturated group is selected from the group consisting of a maleimide group, an α-substituted maleimide group and an α,β-substituted maleimide group. If it is a functional group containing one or more unsaturated bonds, these unsaturated groups generate active radicals upon light irradiation, so the photocurable nail cosmetic (D) should not contain a photopolymerization initiator. may

As the photopolymerization initiator (C) used in the present invention, acetophenone-based, benzoin-based, benzophenone-based, α-aminoketone-based, xanthone-based, anthraquinone-based, acylphosphine oxide-based, high-molecular photopolymerization initiators and the like can be used. It can be selected as appropriate. For example, acetophenones include diethoxyacetophenone, 2,2-dimethoxy-1,2-diphenylethan-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-(4- isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 4-(2-hydroxyethoxy)-phenyl-(2-hydroxy-2-propyl)ketone, 1-hydroxycyclohexylphenylketone, 2-methyl- 1-(4-methylthiophenyl)-2-morpholinopropane-1, benzoins such as benzoin, α-methylbenzoin, α-phenylbenzoin, α-allylbenzoin, α-benzoylbenzoin, benzoin methyl ether, benzoin ethyl ether , benzoin isopropyl ether, benzoin isobutyl ether, benzyl dimethyl ketal, benzophenones such as benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, α-aminoketones such as 2-methyl-1-(4-methylthiophenyl)-2- (4-morpholinyl)-1-propanone, 2-benzyl-2-(dimethylamino)-1-(4-(4-morpholinyl)phenyl)-1-butanone, 2-(dimethylamino)-2-(4- methylphenyl)methyl-1-(4-(4-morpholinyl)phenyl)-1-butanone, xanthone and thioxanthone as xanthone, anthraquinone, 2-methylanthraquinone, 2-ethylanthraquinone and acylphos as anthraquinone As fin oxides, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, as a polymer photopolymerization initiator, 2-hydroxy -2-methyl-1-(4-(1-methylvinyl)phenyl)propan-1-one polymers and the like. These photoinitiators can be used singly or in combination of two or more.

The content of the photopolymerization initiator (C) is preferably 0.1 to 10% by mass, more preferably 0.5 to 5% by mass, based on the total photocurable nail cosmetic (D). When it is 0.1% by mass or more, it has sufficient curability even when applied thinly, and the obtained cured film has good strength and durability. When it is 10% by mass or less, the pot life of the photocurable nail cosmetic (D) is sufficiently long, and troubles such as gelation during storage do not occur.

The photocurable nail cosmetic composition (D) of the present invention can be used without containing a solvent. Moreover, in order to obtain a special product that requires more precise pattern, shape, gloss, hardness, etc., water or an organic solvent may be contained as necessary. The organic solvent preferably has a boiling point of 50 to 120°C, more preferably 55 to 100°C, at normal pressure. Further, from the viewpoint of safety, water, acetone, ethyl acetate, butyl acetate, ethanol, isopropanol, and the like, which are solvents used in ordinary nail polishes and enamels, are particularly preferred. These solvents may be used singly or in combination of two or more. When the solvent is contained, the content is preferably 1.0 to 50% by mass, more preferably 5 to 30% by mass, based on the total photocurable nail cosmetic (D). . Within this range, the photocurable nail cosmetic composition (D) of the present invention can be easily produced without adversely affecting the expected properties of the cured film.

Various additives can be added to the photocurable nail cosmetic (D) of the present invention, if necessary. Specifically, thermal polymerization inhibitors, antioxidants, ultraviolet sensitizers, curing accelerators such as polythiols, preservatives, phosphate esters and other flame retardants, surfactants, antistatic agents, pigments, dyes Colorants, fragrances, antifoaming agents, fillers, silane coupling agents, surface tension modifiers, plasticizers, surface lubricants, leveling agents, softeners, organic fillers, inorganic fillers, etc. can be added. The amount of these other components added is not particularly limited as long as it does not adversely affect the properties expressed by the photocurable nail cosmetic composition (D) according to the present invention, and is 5% by mass or less based on the total amount of (D). A range is preferred.

The photocurable nail cosmetic composition (D) of the present invention can be used as an object such as a user's own nail (ground nail) or an artificial nail to be attached or kneaded to the user's own nail. Specifically, the photocurable nail cosmetic (D) of the present invention is applied to the surface of these objects and cured by light irradiation to obtain a gel nail, nail sheet or nail tip as a cured film. Since the photocurable nail cosmetic composition (D) of the present invention has excellent adhesion to both the natural nail and the acrylic resin that is the material for artificial nails, it can be used as a base coat agent. In this case, if pretreatment such as polishing the surface of the nail or wiping with alcohol is performed, the durability is further improved. In addition, since the cured film of the photocurable nail cosmetic (D) has both flexibility and toughness, the number of times it is turned off with a solvent such as acetone is small, and the cuticle of the nail does not use a solvent. You can also apply the gel on your fingertips and peel it off towards your fingertips. Furthermore, since the photocurable nail cosmetic composition (D) of the present invention is composed of low odor and low or no skin irritation components, it is highly safe and can be used as a nail protector. can.

The photocurable nail cosmetic (D) of the present invention has many polar functional groups such as ester groups, amide groups, and urethane bonds, and can be used with organic or inorganic colorants such as general-purpose pigments, brightening agents, and dyes. Easy to mix evenly. In addition, because of its good photocurability, deep curing of thick films and extreme surface curing of thin films can be completed in a short period of time, and it can be used as a color gel by adding a coloring agent or the like. In this case, it may be applied on top of the cured base coat and cured, or it may be applied directly to the surface of natural nails or artificial nails and cured as a nail cosmetic that achieves two effects of base coat and color coat. be able to. A single layer coating of a thick film may be used, or a lamination coating of thin films may be used.

The photocurable nail cosmetic composition (D) of the present invention has high curability, the hardness of the cured film can be adjusted by the compounding ratio of the constituent components, and it can be suitably used as a topcoat agent. In particular, since no uncured material remains on the extreme surface, sufficient glossiness can be obtained even if wiping with ethanol or water is omitted. Since the cured film of the photocurable nail cosmetic (D) of the present invention has both flexibility and toughness, the surface of the formed gel nail has sufficient hardness and is excellent in scratch resistance and durability. When a transparent gel nail is desired, it may be applied on top of the cured base coat and allowed to cure, and as a nail cosmetic that achieves the dual effects of base coat and top coat, it can be applied directly to the surface of natural nails or artificial nails. It can be applied and cured. In addition, when a gel nail with a modified color or pattern is desired, it may be coated on a laminated cured film of a base coat and a color coat or a single-layer cured film of a base coat and a color coat and cured. Furthermore, it can be applied directly to the surface of natural nails or artificial nails and cured as a one-liquid nail cosmetic that achieves the three effects of base coat, color coat, and top coat. A single layer coating of a thick film may be used, or a lamination coating of thin films may be used.

The method for applying the photocurable nail cosmetic composition (D) of the present invention to a base material such as acrylic resin chips, films, sheets, etc. of natural nails or artificial nails is not particularly limited, and is carried out by a known method. be able to. Examples thereof include a method of applying with a small brush, a method of embossing with a sponge or the like, a spray coating method, an inkjet coating method, a bar coater coating method, a spin coating method, an air knife coating method, and a roll coating method.

When the photocurable nail cosmetic composition (D) of the present invention contains water or an organic solvent, it is preferable to apply the composition onto the various substrates described above, evaporate the solvent, and then perform photocuring. The thickness of the cured film varies depending on the application, such as base coat, color coat, top coat, or one-liquid type that plays two or three roles. The film thickness of is preferably in the range of 1 nm to 1 mm, more preferably 10 nm to 0.7 mm, particularly preferably 100 nm to 0.5 mm . When the film thickness is in the range of 1 nm to 1 mm, the adhesiveness of the cured product to the substrate, the durability of the gel nail, and the scratch resistance as the top layer are both good.

The light source used for photocuring the photocurable nail cosmetic composition (D) of the present invention is not particularly limited as long as it can emit light. For example, known light sources include sunlight, fluorescent lamps, high-pressure mercury lamps, metal halide lamps, ultraviolet (UV) lamps, light emitting diode (LED) lamps, ultraviolet light emitting diode (UV-LED) lamps, ultraviolet laser diodes (UV-LD). ) lamps and the like. In addition, from the viewpoint of small size, long life, high efficiency, low cost and safety, the ultraviolet irradiation type using a 365 nm fluorescent tube and the visible light irradiation type using a 405 nm LED light source are becoming mainstream. preferable.

The irradiation energy required for photocuring the photocurable nail cosmetic composition (D) of the present invention varies somewhat depending on the application and the light source, but the irradiation energy (accumulated amount of light) is preferably in the range of 50 to 10,000 mJ/cm ² . 100 to 3,000 mJ/cm ² is more preferable. This is because within this range, the nail cosmetic can be sufficiently hardened and health problems do not occur. Specific irradiation conditions depend on the preferences of the user, but when curing nail cosmetics with UV, a commercially available UV lamp (36 W) for gel nails is used as the light source, and irradiation for 1 to 2 minutes is recommended. When curing the cosmetic with visible light, it is particularly preferable to use a commercially available LED lamp (40 W) for gel nails as a light source and irradiate for 0.5 to 1 minute.

The (off) method for removing the cured film (gel nail) obtained by photocuring the photocurable nail cosmetic (D) of the present invention from the nail varies depending on the application, but a stripping solution containing a solvent such as acetone is used. There is a method in which the hardened film is swollen by covering the hardened film with a cloth or cotton impregnated with , and then peeled off. In addition, after swelling with a stripping solution, a method of rubbing lightly with a rod or stick to remove, or a method of rubbing a little with a stick and peeling off the entire surface is also used. In addition, when reprocessing is performed (such as when the nail is stretched and a portion not covered with gel nail appears), when the photocurable nail cosmetic composition (D) of the present invention is used as a base coat, the top layer and Only the color layer is removed by swelling or rubbing, and after curing the base coat, apply a new color layer, top layer or 2-part 1-liquid nail cosmetic. Can be applied, cured and repaired. Furthermore, when the gel nail is formed by lamination, there is a method in which the layers are peeled off one by one in order, and after adjusting the consistency with the part where the nail has been repaired, the gel nail is laminated again, applied, and cured. A method of peeling off the gel by raising the gel on the tip of the nail without using a stripping solution is particularly preferable because it does not damage the own nail.

EXAMPLES The present invention will be described in more detail below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. In addition, all "parts" and "%" below are based on mass unless otherwise specified.

Table 1 shows the skeletons, molecular weights, types and quantities of unsaturated groups of polyurethanes (A-1) to (A-6) having (meth)acrylamide groups.

Monofunctional unsaturated compounds (b1) used in Examples and Comparative Examples are shown below.
b1-1: isobornyl acrylate (IBOA)
b1-2: 2-hydroxyethyl methacrylate (HEMA)
b1-3: N-(2-hydroxyethyl)maleimide (HEMI)
b1-4: 2-hydroxypropyl methacrylate (2HPMA)
b1-5: 4-hydroxybutyl acrylate (4HBA)
b1-6: ethoxydiethylene glycol acrylate (ECA)
b1-7: 2-hydroxyethyl vinyl ether (HEVE)
b1-8: Acryloylmorpholine (registered trademark "ACMO" of KJ Chemicals Co., Ltd.)
b1-9: Dimethylacrylamide (registered trademark of KJ Chemicals Co., Ltd. "DMAA")
b1-10: Diethylacrylamide (registered trademark "DEAA" of KJ Chemicals Co., Ltd.)
b1-11: N-(2-hydroxyethyl)acrylamide (registered trademark of KJ Chemicals Co., Ltd. "HEAA")
b1-12: Isopropyl acrylamide (registered trademark "NIPAM" of KJ Chemicals Co., Ltd.)
b1-13: Dimethylaminopropyl acrylamide (registered trademark "DMAPAA" of KJ Chemicals Co., Ltd.)
b1-14: diacetone acrylamide (DAAM)
b1-15: N-vinylpyrrolidone (NVP)
b1-16: N-vinylcaprolactam (NVC)

Polyfunctional unsaturated compounds (b2) used in Examples and Comparative Examples are shown below.
b2-1: triethylene glycol diacrylate (TEGDA)
b2-2: triethylene glycol dimethacrylate (TEGDMA)
b2-3: trimethylolprohane triacrylate (TMPTA)
b2-4: Tricyclodecanedimethanol diacrylate (A-DCP, manufactured by Shin-Nakamura Chemical Co., Ltd.)
b2-5: urethane diacrylate (UA, bifunctional, polyester skeleton, molecular weight 5000)

Photopolymerization initiators (C) used in Examples and Comparative Examples are shown below.
C-1: 1-hydroxycyclohexyl phenyl ketone (IRGACURE184, manufactured by BASF Japan Ltd.)
C-2: 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (IRGACURE-TPO, manufactured by BASF Japan Ltd.)
C-3: 1-hydroxycyclohexylphenyl ketone / benzophenone = 1/1 mixture (IRGACURE-500, manufactured by BASF Japan Ltd.)

Example 1 Preparation of photocurable nail cosmetic (D-1 ) 97.0 parts by mass of polyurethane (A-1) having a polybutadiene skeleton having an acrylamide group as (A), 1-hydroxycyclohexylphenyl ketone (C) as (C) 3.0 parts by mass of C-1 and IRGACURE 184) were added to a container and stirred at 40° C. for 1 hour to obtain a uniformly transparent photocurable nail cosmetic composition (D-1) of Example 1.

Examples 2 to 10 Preparation of photocurable nail cosmetics (D-2) to (D-10) Corresponding to Examples 2 to 10 by performing the same operation as in Example 1 with the compositions shown in Table 2. Photocurable nail cosmetics (D-2) to (D-10) were obtained.

Comparative Examples 1 to 5 Preparation of photocurable resin compositions (E-1) to (E-5) Corresponding to Comparative Examples 1 to 5 by performing the same operation as in Example 1 with the compositions shown in Table 2 Photocurable resin compositions (E-1) to (E-5) were obtained.

The photocurable nail cosmetics obtained in Examples 1 to 10 and the photocurable resin compositions obtained in Comparative Examples 1 to 5 were evaluated by the following method, and the results are shown in Table 3. . In addition, all evaluations represent the average value of 10 times.

The photocurable nail cosmetics obtained in Examples 1 to 10 and the photocurable resin compositions obtained in Comparative Examples 1 to 5 were evenly applied to the own nail using a flat brush, and the coatability was visually observed. Evaluation was performed according to the following criteria, and the results are shown in Table 3.
1. Coatability ⊚: A smooth coating film was formed with no stringiness during coating and no handwriting after coating.
◯: Slight stringiness during application or slight handwriting was observed after application, but the handwriting disappeared after standing for 30 seconds, and a smooth coating film was formed.
Δ: Slight stringiness during application or slight handwriting was observed after application, and residual handwriting was observed even after standing still for 30 seconds.
x: Stringiness was observed during application or handwriting was observed after application, and a uniform coating film was not obtained.
2. Curability The photocurable nail cosmetics obtained in Examples 1 to 10 and the photocurable resin compositions obtained in Comparative Examples 1 to 5 were evenly applied to the own nail using a flat brush, and the gel nail was obtained. After UV irradiation for 1 minute using a dedicated UV lamp (36 W), the surface of the cured film was touched with a finger to evaluate stickiness and confirm the presence or absence of uncured components.
A: No stickiness at all (completely cured).
◯: Slightly sticky, but finger marks are not left on the surface (almost completely cured, wiping off uncured components is unnecessary).
Δ: Sticky, finger marks remain on the surface (incomplete curing, uncured components must be wiped off).
x: Extremely sticky, finger sticks to the surface (a large amount of uncured components remains and cannot be used as a cured film).
3. Glossiness The cured film (gel nail) obtained in the curability evaluation was visually observed to confirm the glossiness.
⊚: The surface is glossy.
◯: Reflection of light can be confirmed, but slight cloudiness is observed.
Δ: The surface is slightly cloudy as a whole.
x: The surface becomes cloudy.
4. Adhesion (surface hardness)
The cured film (gel nail) obtained in the above curability evaluation was drawn with a pencil of F hardness under a constant load, and the presence or absence of peeling and the presence or absence of scratches were evaluated according to the following evaluation criteria.
A: Neither damage nor peeling occurred. The surface hardness has a pencil hardness of F or higher.
◯: No peeling occurred, but scratches occurred, but were naturally repaired over time.
Δ: No peeling occurred, but damage occurred and was not repaired.
x: Peeling occurred.
5. Durability In the cured film (gel nail) obtained in the above curability evaluation, changes in appearance of the film were visually confirmed after 2 weeks of daily life.
A: No change in appearance.
◯: Slightly damaged, but still in close contact with the nail.
Δ: There was a damaged portion or a portion slightly peeled off from the nail.
x: There was remarkable damage or peeling.
6. Removability (swelling peeling)
A cotton pad containing acetone was placed so as to cover the cured film (gel nail) obtained in the curability evaluation. Next, cover the entire nail with aluminum foil, put on a saniment glove, and leave it in warm water for 10 minutes. The aluminum foil and cotton were removed and lightly rubbed with a cloth.
A: The nail decoration could be easily peeled off without using a cloth.
◯: The nail decoration could be easily peeled off by lightly rubbing with a cloth.
Δ: The nail decoration could be peeled off by rubbing with a cloth for about 1 minute.
x: Not swelled by acetone and not peeled off even by rubbing with a cloth.
7. Removability (toe peeling)
In the one-liquid type cured film (gel nail) obtained in the above curability evaluation, the gel on the cuticle side of the nail was raised on the tip of the nail and slowly peeled off toward the fingertip.
A: The gel nail could be easily peeled off without leaving a cured film on the nail.
Good: A slight amount of cured film remained on the nail, but it could be easily peeled off by rubbing lightly with the tip of the nail.
Δ: A cured film remained on the nail, and after immersion in warm water, it could be removed by lightly rubbing it with the tip of the nail, a rod-shaped object, or a stick-shaped object.
x: The cured film was hardly peeled off, and after immersion in warm water, it was impossible to scrape off with a fingernail, a bar-like object, or a stick-like object.
8. Storage Stability Put the photocurable nail cosmetics obtained in Examples 1 to 10 and the photocurable resin compositions obtained in Comparative Examples 1 to 5 into a light-shielding screw tube, close the lid, and store at 40° C. for 1 It was stored under two conditions, one month and two weeks at 80°C. Presence or absence of an increase in liquid viscosity after storage was confirmed, and storage stability was evaluated.
◯: No increase in viscosity after storage under the two conditions of 40° C. for 1 month and 80° C. for 2 weeks.
Δ: An increase in viscosity after storage was confirmed under either one condition of 40° C. for 1 month or 80° C. for 2 weeks.
x: An increase in viscosity after storage was confirmed under both conditions of 1 month at 40°C and 2 weeks at 80°C.

As shown in the results of Examples and Comparative Examples, when the polyurethane (A) having a (meth)acrylamide group of the present invention is contained, the photocurable nail makeup satisfies all of the applicability, curability and storage stability. fee can be obtained. In addition, by blending the polyurethane (A) having a (meth)acrylamide group, it is possible to form a cured film (gel nail) that has both flexibility and toughness, and is excellent in glossiness, adhesion, surface hardness and durability. It could be peeled off by swelling with a solvent, and by peeling off with the tip of the nail, it could be easily removed without damaging the natural nail. If necessary, the compound (B) having an ethylenically unsaturated group can be used together, and it can be suitably used as an underlayer, an intermediate layer, a top layer, or a one-liquid type gel.

As described above, the photocurable nail cosmetic composition of the present invention is excellent in applicability, curability, safety and storage stability, and has sufficient curability whether applied thinly or thickly. It can be suitably used as a feed. Further, the adhesiveness to nails, the compatibility with pigments, and the glossiness and durability of the resulting cured film are good, and it can be used as a base layer, intermediate layer, top layer, or as a one-liquid type gel. The photocurable nail cosmetic composition of the present invention can be cured in a single layer or multiple layers of liquids having the same or different compositions, and the formed cured film has both flexibility and toughness, and can be easily repaired and removed. Therefore, it can be widely used as gel nails, nail stickers, and nail tips.

Claims (14)

A photocurable nail cosmetic containing a polyurethane (A) having a (meth)acrylamide group and a compound (B) having an ethylenically unsaturated group (excluding (A)) , wherein (A) is at least a polycarbonate skeleton , having one or more skeletons selected from polyolefin skeletons, (A) having a number average molecular weight in the range of 8,000 to 1,000,000 ,
A photocurable nail cosmetic composition, wherein the content of (A) is 1.0 to 90% by mass and the content of (B) is 5 to 99% by mass . 2. The photocurable nail cosmetic composition according to claim 1, wherein the polyurethane (A) having (meth)acrylamide groups contains 1 to 10 (meth)acrylamide groups per molecule. The (meth)acrylamide group-containing polyurethane (A) has at least one skeleton selected from the group consisting of a polycarbonate skeleton, a polybutadiene skeleton, a hydrogenated polybutadiene skeleton, a polyisoprene skeleton, and a hydrogenated polyisoprene skeleton. The photocurable nail cosmetic composition according to claim 1 or 2, characterized by comprising: The compound (B) having an ethylenically unsaturated group contains a monofunctional unsaturated compound (b1) having one ethylenically unsaturated group in the molecule, and the content of (b1) is the total of (B) 4. The photocurable nail cosmetic composition according to any one of claims 1 to 3, which is 50 to 100% by mass based on the weight of the nail. The compound (B) having an ethylenically unsaturated group contains a polyfunctional unsaturated compound (b2) having two or more ethylenically unsaturated groups in the molecule, and the content of (b2) is the total of (B) The photocurable nail cosmetic composition according to any one of claims 1 to 4, characterized in that it is 0 to 50% by mass based on the. The compound (B) having an ethylenically unsaturated group includes, as unsaturated groups, a (meth)acrylate group, a (meth)acrylamide group, a vinyl group, a vinyl ether group, a methyl vinyl ether group, an allyl group, a (meth)allyl ether group and maleimide. The photocurable nail cosmetic composition according to any one of claims 1 to 4, which is a functional group having one or more unsaturated bonds selected from the group consisting of groups. The compound (B) having an ethylenically unsaturated group is one or more compounds selected from the group consisting of methacrylate-based monomers, acrylate-based monomers, methacrylamide-based monomers, and acrylamide-based monomers. 7. The photocurable nail cosmetic composition according to any one of 1 to 6. The compound (B) having an ethylenically unsaturated group has the general formula [1] (wherein R ₁ represents a hydrogen atom or a methyl group; R ₂ and R ₃ each independently represent a hydrogen atom; Linear or branched alkyl groups, alkyl ether groups, alicyclic hydrocarbons and aromatic hydrocarbons, alkoxy groups introduced with linear, branched, or cyclic alkyl groups having 1 to 6 carbon atoms , hydroxyalkyl group, 4-hydroxyphenyl group, alkylsulfonic acid group, aminoalkyl group, N'-alkylaminoalkyl group, N',N'-dialkylaminoalkyl group, and R ₂ and R ₃ are It represents a saturated 5- to 7-membered ring (including those having an oxygen atom) together with the nitrogen atoms supporting them. ) N-substituted (meth)acrylamide and N,N-disubstituted (meth)acrylamide, diacetone (meth)acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam one or more selected from the group The photocurable nail cosmetic composition according to any one of claims 1 to 7, which is a compound.

The compound (B) having an ethylenically unsaturated group includes N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N,N-dimethylaminopropyl (meth) ) acrylamide, N-hydroxyethyl (meth)acrylamide, N-methyl-N-hydroxyethyl (meth)acrylamide, N-(meth)acryloylmorpholine, diacetone (meth)acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam , methoxybutyl (meth)acrylamide, and the photocurable nail cosmetic composition according to any one of claims 1 to 8. The photocurable nail cosmetic composition according to any one of claims 1 to 9, further comprising 0.1 to 10 % by mass of a photopolymerization initiator (C). The photocurable nail cosmetic composition according to any one of claims 1 to 10 is a photocurable nail cosmetic composition for a top coat. A gel nail obtained by curing the photocurable nail cosmetic according to any one of claims 1 to 11 with light. A nail seal characterized by being formed by applying the photocurable nail cosmetic composition according to any one of claims 1 to 11 on a base material and then curing it with light. A nail tip, which is formed by applying the photocurable nail cosmetic composition according to any one of claims 1 to 11 on a substrate and then curing the composition with light.