WO2016031709A1 - Nail cosmetic, artificial nail, and nail art kit - Google Patents

Abstract

The purpose of this invention is to provide a nail cosmetic having excellent adhesiveness and excellent peeling properties, an artificial nail using the nail cosmetic, and a nail art kit including the nail cosmetic. The nail cosmetic is characterized by containing a compound having at least two (meth)acrylamide groups. It is preferable that the nail cosmetic further include a photopolymerization initiator. Also, it is preferable that the nail cosmetic further include a polymer and/or an oligomer. Additionally, it is preferable that the nail cosmetic further include an ethylenically unsaturated compound other than the compound having at least two (meth)acrylamide groups.

Description

Nail cosmetics, artificial nails, and nail art kits

The present invention relates to nail cosmetics, artificial nails, and nail art kits.

In recent years, the popularity of nail art for designing hands and toenails has increased, and technology for forming synthetic resin artificial nails (fake nails, nail tips, etc.) on nails (self nails) has been developed (Patent Literature). 1). Recently, a nail decoration called an artificial nail that has been cured by irradiating ultraviolet rays after applying a gel-like decorative curable composition containing a urethane-based resin and a photopolymerizable monomer to the nail has a clear finish. It has attracted attention for reasons such as high adhesion with nails and long-lastingness, and no odor like acrylic resin (Patent Document 2).
As such a gel-like decorative curable composition, a composition using an acrylamide monomer that is liquid at 25 ° C. is known (Patent Document 3).
On the other hand, a curable composition containing a compound having two or more (meth) acrylamide groups and a polymerization initiator is known (Patent Document 4).

JP 2004-275736 A Special Table 2002-505915 Japanese Patent No. 4981844 JP 2014-118442 A

The problem to be solved by the present invention is to provide a nail cosmetic excellent in adhesion and exfoliation, an artificial nail using the nail cosmetic, and a nail art kit including the nail cosmetic. That is.

The above object has been achieved by the means described in <1>, <13> or <14> below. It is shown below together with <2> to <12> which are preferred embodiments.
<1> A nail cosmetic comprising a compound having two or more (meth) acrylamide groups,
<2> The nail cosmetic according to <1>, wherein the compound having two or more (meth) acrylamide groups is a compound represented by any one of the following formulas 1 to 4:

In Formula 1, each R independently represents a hydrogen atom or a methyl group, each R ^a independently represents ^a hydrogen atom, an alkyl group, an aryl group, or a heterocyclic group, and each L ^a independently represents ^a single bond or Z represents ^a q + 1 valent organic group, and q represents an integer of 1 to 6.

In Formula 2, each R ⁵ independently represents a hydrogen atom or a methyl group, each L ^b independently represents an alkylene group having 1 to 8 carbon atoms, and k and p each independently represents 0 or 1 J represents an integer of 0 to 8 independently.

In Formula 3, each R ⁷ independently represents a hydrogen atom or a methyl group, each t independently represents an integer of 1 to 8, and u represents an integer of 0 to 5.

In Formula 4, Z ^b represents a residue obtained by removing v hydrogen atoms from the hydroxyl group of the polyol, v represents an integer of 3 to 6, R ⁸ independently represents a hydrogen atom or a methyl group, L Each ^c independently represents an alkylene group having 1 to 8 carbon atoms.

<3> The nail cosmetic according to <2>, wherein the compound having two or more (meth) acrylamide groups is a compound represented by the above formula 1.
<4> The nail cosmetic according to <2>, wherein the compound having two or more (meth) acrylamide groups is a compound represented by the above formula 2.
<5> A nail cosmetic according to any one of <1> to <4>, further comprising a photopolymerization initiator,
<6> The photopolymerization initiator is at least one compound selected from the group consisting of an acetophenone compound, a benzophenone compound, a thioxanthone compound, a phosphine oxide compound, a metallocene compound, and a lophine dimer compound, in <5> Nail cosmetics as described,
<7> The nail cosmetic according to any one of <1> to <6>, further comprising a polymer and / or an oligomer,
<8> The nail cosmetic according to <7>, wherein the polymer and / or oligomer is a polymer and / or oligomer having a structure represented by the following formula C-1 and / or an amino group:

In the formula C-1, the wavy line part independently represents the bonding position with another structure.

<9> The nail cosmetic according to any one of <1> to <8>, further including an ethylenically unsaturated compound other than the compound having two or more (meth) acrylamide groups,
<10> The ethylenically unsaturated compound is acrylic acid, methacrylic acid, N, N-dimethylacrylamide, N, N-diethylacrylamide, morpholine acrylamide, N-hydroxyethylacrylamide, N-vinylpyrrolidone, N-vinylcaprolactam, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate, 4- The nail cosmetic according to <9>, comprising at least a compound selected from the group consisting of hydroxybutyl acrylate and glycerin monomethacrylate,
<11> A nail cosmetic according to any one of <1> to <10>, further comprising a solvent,
<12> The solvent is water, methanol, ethanol, isopropanol, 1-propanol, 1-butanol, 2-butanol, t-butyl alcohol, 2-methyl-1-propanol, 1-methoxy-2-propanol, acetic acid, And a nail cosmetic according to <11>, comprising at least a compound selected from the group consisting of acetonitrile,
<13> An artificial nail having a layer formed from the nail cosmetic according to any one of <1> to <12>
<14> A nail art kit comprising the nail cosmetic according to any one of <1> to <12>.

According to the present invention, it was possible to provide a nail cosmetic excellent in adhesion and exfoliation, an artificial nail using the nail cosmetic, and a nail art kit including the nail cosmetic. .

Hereinafter, the present invention will be described in detail.
In the present specification, the description of “xx to yy” represents a numerical range including xx and yy.
“(Meth) acrylamide” and the like are synonymous with “acrylamide and / or methacrylamide” and the like.
In the present invention, “mass%” and “wt%” are synonymous, and “part by mass” and “part by weight” are synonymous.
Moreover, in this invention, the combination of 2 or more of a preferable aspect is a more preferable aspect.
In this specification, regarding the notation of a group in a compound represented by the formula, if it is not substituted or unsubstituted, and the group can further have a substituent, unless otherwise specified, In addition to an unsubstituted group, a group having a substituent is also included. For example, in the formula, if there is a description that “R represents an alkyl group, an aryl group or a heterocyclic group”, “R is an unsubstituted alkyl group, a substituted alkyl group, an unsubstituted aryl group, a substituted aryl group, an unsubstituted group” Represents a heterocyclic group or a substituted heterocyclic group.

(Nail cosmetics)
The nail cosmetic of the present invention is characterized by containing a compound having two or more (meth) acrylamide groups.
The nail cosmetic of the present invention can be suitably used not only as a nail polish such as nail polish or pedicure, or as a composition for forming a gel nail, but also as a nail protectant such as a nail coat.
The nail cosmetic of the present invention can be suitably used for any of a primer layer, a base layer, a color layer, and / or a top layer in an artificial nail. Especially, it can use suitably as a primer layer or a nail cosmetic for base layers, and can use it more suitably as a nail cosmetic for base layers.
The nail cosmetic of the present invention is preferably a photocurable composition.
The artificial nail of the present invention is an artificial nail having a layer formed by the nail cosmetic of the present invention.

<Compound having two or more (meth) acrylamide groups>
The nail cosmetic of the present invention contains a compound having two or more (meth) acrylamide groups (hereinafter also referred to as “specific compound”).
As the compound having two or more (meth) acrylamide groups used in the present invention, any compound having two or more groups represented by the following formula A in the molecule can be suitably used.

In Formula A, R ¹ represents a hydrogen atom or a methyl group, and * represents a bonding position with another structure.

Further, the (meth) acrylamide group of the compound having two or more (meth) acrylamide groups may have not only a hydrogen atom but also a monovalent organic group on the nitrogen atom. It is preferably a hydrogen atom. As said monovalent organic group, an alkyl group, an aryl group, or a heterocyclic group is mentioned preferably, An alkyl group is mentioned more preferably. The number of carbon atoms of the monovalent organic group is preferably 1-14, and more preferably 1-8.
A compound having two or more (meth) acrylamide groups may have only an acrylamide group, may have only a methacrylamide group, or may have both an acrylamide group and a methacrylamide group.
The compound having two or more (meth) acrylamide groups is preferably a compound having 2 to 6 (meth) acrylamide groups, more preferably a compound having 2 to 4 (meth) acrylamide groups, A compound having 3 or 4 (meth) acrylamide groups is more preferable, and a compound having 4 (meth) acrylamide groups is particularly preferable.
The compound having two or more (meth) acrylamide groups preferably includes a compound represented by any one of the following formulas 1 to 4, and a compound represented by any one of the following formulas 1 to 4. Is more preferable.
First, the compound represented by Formula 1 will be described.

In Formula 1, each R independently represents a hydrogen atom or a methyl group, each R ^a independently represents ^a hydrogen atom, an alkyl group, an aryl group, or a heterocyclic group, and each L ^a independently represents ^a single bond or Z represents ^a q + 1 valent organic group, and q represents an integer of 1 to 6.

Rs present in the same molecule may be the same or different, but are preferably all the same and more preferably all the same hydrogen atoms.
Each R ^a is preferably independently a hydrogen atom or an alkyl group, more preferably a hydrogen atom or an unsubstituted alkyl group, and even more preferably a hydrogen atom.
R ^a present in the same molecule may be the same or different but are preferably all the same.
When R ^a is an alkyl group, the number of carbon atoms is preferably 1-8. The alkyl group may be linear or branched. Examples of the alkyl group include a methyl group, an ethyl group, an isopropyl group, a t-butyl group, and a 2-ethylhexyl group.
When R ^a is an aryl group, the number of carbon atoms is preferably 6 to 14. Examples of the aryl group include a phenyl group and a naphthyl group.
When R ^a is a heterocyclic group, the heterocyclic ring may be an aromatic heterocyclic ring or a non-aromatic heterocyclic ring. Further, it may be a single ring or a condensed ring. The heterocyclic ring is preferably a ring containing an oxygen atom, a sulfur atom or a nitrogen atom as a ring constituent atom, and is preferably a 5-membered ring or a 6-membered ring. Examples of the heterocyclic ring include a pyrrole ring, an imidazole ring, a pyrazole ring, a pyridine ring, a triazine ring, an indole ring, a thiophene ring, a furan ring, a piperazine ring, a piperidine ring, and a morpholine ring.

L ^a represents an alkylene group, an ethynylene group, an arylene group, a divalent heterocyclic group, —O—, —S—, —N (R ^a ) —, —C (═O) —, —SO—, —SO _2- or a combination thereof (for example, -alkylene-O—, —O—C (═O) —, —C (═O) —O—, —C (═O) —N (R ^a ) —) , —N (R ^a ) —C (═O) —, —SO ₂ —N (R ^a ) —, —N (R ^a ) —SO ₂ —, etc.) are preferred, —O—, an alkylene group or these More preferred is a linking group having at least a partial group as a combination of groups, more preferably —O—, an alkylene group, or a combination of these groups alone. R ^a in L ^a has the same meaning as R ^{a in} Formula 1, and the preferred embodiment is also the same. L ^a present in the same molecule may be the same or different but are preferably all the same.
These groups may have a substituent, and as the substituent, an alkyl group, an aryl group, and a hydroxyl group are preferable.
Examples of the alkylene group include a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, a heptylene group, an octylene group, and a nonylene group.
Examples of the arylene group include a phenylene group and a naphthylene group.
The heterocyclic ring in the divalent heterocyclic group may be an aromatic heterocyclic ring, a non-aromatic heterocyclic ring, a monocyclic ring or a condensed ring. The heterocyclic ring is preferably a ring in which the ring-constituting atoms include any of an oxygen atom, a sulfur atom or a nitrogen atom, and a 5-membered or 6-membered heterocyclic ring is preferred. Specific examples of such heterocycle include pyridine ring, pyrazine ring, pyrimidine ring, pyridazine ring, triazine ring, quinoline ring, isoquinoline ring, quinazoline ring, cinnoline ring, phthalazine ring, quinoxaline ring, pyrrole ring, indole ring, Furan ring, benzofuran ring, thiophene ring, benzothiophene ring, pyrazole ring, imidazole ring, benzimidazole ring, triazole ring, oxazole ring, benzoxazole ring, thiazole ring, benzothiazole ring, isothiazole ring, benzisothiazole ring, thiadiazole And a ring, an isoxazole ring, a benzisoxazole ring, a pyrrolidine ring, a piperidine ring, a piperazine ring, an imidazolidine ring, and a thiazoline ring.
In the above specific examples, the examples are shown in the form of a heterocyclic ring in which two bonding positions are omitted, but the two bonding positions are not limited. For example, in the case of a pyridine ring, any one of positions 2 to 6 is used. For example, pyridine-2,4-diyl and pyridine-2,6-diyl. Substitution at the 3rd and 4th positions is possible.
As the divalent heterocyclic group, a divalent aromatic heterocyclic group is preferable, and as the heterocyclic ring of the divalent aromatic heterocyclic group, a pyridine ring, a pyrazine ring, a pyrimidine ring, a pyridazine ring, a triazine ring, a pyrazole A ring, imidazole ring, benzimidazole ring, triazole ring, thiazole ring, benzothiazole ring, isothiazole ring, benzisothiazole ring, or thiadiazole ring is preferable. These heterocycles may have a substituent, and examples of the substituent include an alkyl group, an aryl group, and an alkoxy group.

Z ^a is more preferably preferably q + 1 valent aliphatic group, a q + 1 valent aliphatic hydrocarbon group.
Z ^a number of carbon atoms is preferably 1 to 10, more preferably 1 to 8, more preferably 1 to 4, 1 is particularly preferred.

The compound represented by the above formula 1 is preferably a compound represented by the following formula 1-1.

In Formula 1-1, R ^b represents a hydrogen atom, an alkyl group, or —L ^a —N (R ^a ) —C (═O) —C (R) ═CH _2, and each R independently represents a hydrogen atom or Represents ^a methyl group, each R ^a independently represents ^a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group, and each L ^a independently represents ^a single bond or a divalent linking group.

R, R ^a and L ^a in Formula 1-1 have the same meanings as R, R ^a and L ^b in Formula 1, respectively, and preferred embodiments are also the same.
The alkyl group for R ^b is preferably an alkyl group having 1 to 10 carbon atoms, and the alkyl group may have a substituent. Examples of such substituents include alkyl groups, alkenyl groups, aryl groups, heterocyclic groups, halogen atoms, hydroxyl groups, alkoxy groups, aryloxy groups, alkylthio groups, arylthio groups, amino groups, alkylamino groups, and aryl groups. An amino group, a heterocyclic amino group, an acyl group, an alkyl or aryl oxycarbonyl group, an acyloxy group, an acylamino group, an alkyl or arylsulfonyl group, an alkyl or arylsulfonamido group, a carbamoyl group, a sulfamoyl group, and a cyano group. Can be mentioned.
R ^b is preferably —L ^a —N (R ^a ) —C (═O) —C (R) ═CH ₂ . That is, the compound represented by Formula 1-1 is preferably a compound represented by Formula 1-2 below.

In Formula 1-2, each R independently represents a hydrogen atom or a methyl group, each R ^a independently represents ^a hydrogen atom, an alkyl group, an aryl group, or a heterocyclic group, and each L ^a independently represents a single atom. Represents a bond or a divalent linking group.

Each R, ^{R a} and ^{L a} in Formula 1-2 is synonymous with R, ^{R a} and ^{L a} in the formula 1, preferred embodiment is also the same.
The compound represented by the above formula 1 is particularly preferably a compound represented by the following formula 1-3.

In Formula 1-3, each R ⁴ independently represents a hydrogen atom or a methyl group, each L ¹ independently represents a divalent linking group, and each L ² independently via at least two carbon atoms. A linear or branched alkylene group having 2 to 4 carbon atoms connected to each other, w is independently 2 or 3, and x, y and z are each independently an integer of 0 to 6. .

R ⁴ is preferably a hydrogen atom. R ⁴ present in the same molecule may be the same or different, but it is preferable that they are all the same.
A preferred embodiment of the divalent linking group for L ¹ is the same as the preferred embodiment in divalent linking group for the L ^a. L ¹ existing in the same molecule may be the same or different, but it is preferable that they are all the same.
When L ¹ is an alkylene group, the number of carbon atoms is preferably 1 to 6, more preferably 1 to 3, and particularly preferably 1.
When L ¹ is an arylene group, the number of carbon atoms is preferably 6 to 14, more preferably 6 to 10, and particularly preferably 6. The arylene group may have a substituent, and examples of the substituent include an alkyl group and an alkoxy group.
Among them, L ¹ are each independently preferably an alkylene group.
In Formula 1-3, w is 2 or 3. The plurality of w are preferably the same. C _w H _2w may be a linear alkylene group or a branched alkylene group.
In Formula 1-3, x, y, and z are each independently preferably an integer of 0 to 5, and more preferably an integer of 0 to 3.
The total number of x + y + z is preferably an integer of 0 to 18, more preferably an integer of 0 to 15, and still more preferably an integer of 0 to 9.

Specific examples of the compound represented by Formula 1 are shown below, but the present invention is not limited thereto.

Among these specific examples, compounds 1-a, 1-b, 1-c, 1-g, 1-h or 1-i are more preferable, and compound 1-a is particularly preferable.

Subsequently, the compound represented by Formula 2 will be described.

In Formula 2, each R ⁵ independently represents a hydrogen atom or a methyl group, each L ^b independently represents an alkylene group having 1 to 8 carbon atoms, and k and p each independently represents 0 or 1 J represents an integer of 0 to 8 independently.

R ⁵ is preferably a hydrogen atom. R ⁵ present in the same molecule may be the same or different, but it is preferable that they are all the same.
L ^b may be a linear alkylene group or a branched alkylene group.
L ^b preferably has 2 to 5 carbon atoms, and more preferably 3 or 4. L ^b existing in the same molecule may be the same or different, but it is preferable that they are all the same.
k and p are preferably 1.
j is independently an integer of 2 to 6, and more preferably an integer of 2 to 4.

Specific examples of the compound represented by Formula 2 are shown below, but the present invention is not limited thereto.

Among these specific examples, the compounds 2-a, 2-b, 2-c, 2-d, 2-e, and 2-p are more preferable, and the compounds 2-a and 2-c are particularly preferable.

Subsequently, the compound represented by Formula 3 will be described.

In Formula 3, each R ⁷ independently represents a hydrogen atom or a methyl group, each t independently represents an integer of 1 to 8, and u represents an integer of 0 to 5.

R ⁷ is preferably a hydrogen atom. R ⁷ present in the same molecule may be the same or different, but is preferably the same.
Each t is independently preferably an integer of 1 to 5, more preferably an integer of 2 to 4.
The alkylene group represented by C _t H _2t may be a linear alkylene group or a branched alkylene group, but is preferably a linear alkylene group.
u is preferably an integer of 0 to 3, more preferably an integer of 0 to 2, and particularly preferably 0 or 1.
The compound represented by the formula 3 is preferably a compound represented by any one of the following formulas 3-1 and 3-2. R ⁷ in formula 3-1 and formula 3-2 has the same meaning as R ⁷ in formula 3, and the preferred embodiments are also the same.

Specific examples of the compound represented by Formula 3 are shown below, but the present invention is not limited thereto.

Subsequently, the compound represented by Formula 4 will be described.

In Formula 4, Z ^b represents a residue obtained by removing v hydrogen atoms from the hydroxyl group of the polyol, v represents an integer of 3 to 6, R ⁸ independently represents a hydrogen atom or a methyl group, L Each ^c independently represents an alkylene group having 1 to 8 carbon atoms.

The polyol in Z ^b is preferably a polyhydric alcohol having 3 to 6 hydroxyl groups, more preferably a polyhydric alcohol having 3 to 5 hydroxyl groups, and further a polyhydric alcohol having 3 or 4 hydroxyl groups. preferable. The polyol has preferably 3 to 12 carbon atoms, more preferably 3 to 10 carbon atoms, and particularly preferably 3 to 6 carbon atoms. The polyol may be a polyhydric alcohol condensate compound formed by condensation (dehydration) of two or more polyhydric alcohol compounds.
Specific examples of the polyol include glycerin, trimethylolethane, trimethylolpropane, ditrimethylolpropane, xylitol, sorbitol, erythritol, pentaerythritol, dipentaerythritol, mannitol, and tris (2-hydroxyethyl) isocyanurate. Can be mentioned. Among these, glycerin, erythritol, or pentaerythritol is preferable.
v is preferably an integer of 3 to 5, and more preferably 3 or 4.
R ⁸ is preferably a hydrogen atom. The plurality of R ⁸ are preferably the same.
L ^c may be a linear alkylene group or a branched alkylene group.
L ^c is preferably an alkylene group having 2 to 5 carbon atoms, and more preferably an alkylene group having 3 or 4 carbon atoms. The plurality of L ^c are preferably the same.

The compound represented by the formula 4 is preferably a compound represented by any one of the following formulas 4-1 and 4-2. R ⁸ in formula 4-1 and formula 4-2 has the same meaning as R ⁸ in formula 4, and the preferred embodiments are also the same.

Specific examples of the compound represented by Formula 4 are shown below, but the present invention is not limited thereto.

Among these compounds, the compound having two or more (meth) acrylamide groups is preferably a compound represented by either Formula 1 or Formula 2, and a compound represented by Formula 1 is particularly preferred.

A compound having two or more (meth) acrylamide groups is a polyfunctional monomer having a large and dense ratio of (meth) acrylamide groups per skeleton, and has high polymerization ability or curing ability.
The content of the compound having two or more (meth) acrylamide groups in the nail cosmetic of the present invention is not particularly limited, but is 0.5 to 99% by mass based on the mass with respect to the total amount of the nail cosmetic. It is preferably from 1.0 to 95% by mass, more preferably from 2.0 to 90% by mass. Within the above range, the adhesion to the nail is improved and the sustainability is improved.

<Photopolymerization initiator>
The nail cosmetic of the present invention preferably contains a photopolymerization initiator, and more preferably contains a photoradical polymerization initiator.
As a photoinitiator, if it is a well-known photoinitiator, it can be used conveniently. Although the specific example of a photoinitiator is shown below, this invention is not limited to these.
Acetophenone compounds (eg, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2-phenylacetophenone, 2-hydroxy-2-methylpropiophenone, 4'-isopropyl-2-hydroxy-2-methylpropiophenone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-1-propane, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butan-1-one, 1- [4 -(2-hydroxyethoxy) phenyl] -2-hydroxy-2-methyl-1-propan-1-one, 1- [4- (2- (2-hydroxyethoxy) ethoxy) phenyl] -2-hydroxy-2 -Methyl-1-propan-1-one, benzoin, benzoin methyl ether, etc.);
Benzophenone compounds (eg 4,4′-bis (dimethylamino) benzophenone, 3,3-dimethyl-4-methoxy-benzophenone, etc.);
Anthraquinone compounds (for example, anthraquinone, 2-methylanthraquinone, 2-ethylanthraquinone, tert-butylanthraquinone, etc.);
A thioxanthone compound (for example, 2-chlorothioxanthone, diethylthioxanthone, isopropylthioxanthone, diisopropylthioxanthone, etc.);
Trihaloalkyl compounds (eg, 2,4,6- (trichloromethyl) triazine, 2,4-trichloromethyl-6- (4-methoxyphenyl) triazine, tribromomethylphenylsulfone, etc.);
Lophine dimer compounds (eg, 2- (o-chlorophenyl) -4,5-diphenylimidazolyl dimer);
Acridine compounds (eg, 9-phenylacridine, 1,7-bis (9-acridinyl) heptane, 1,5-bis (9-acridinyl) pentane, 1,3-bis (9-acridinyl) pronopane);
Phosphine oxide compounds (eg trimethylbenzoyldiphenylphosphine oxide);
Metallocene compounds (for example, biscyclopentadienylbis (difluoropyrylphenyl) titanium, etc.);
Onium salt compounds (for example, bis (4-tert-butylphenyl) iodonium tosylate, triphenylsulfonium tosylate, etc.).

As the photopolymerization initiator, it can be appropriately selected according to the wavelength of light emitted from the light source used for exposure, but from acetophenone compounds, benzophenone compounds, thioxanthone compounds, phosphine oxide compounds, metallocene compounds, and lophine dimer compounds Preferably, the compound is at least one compound selected from the group consisting of: acetophenone compounds, benzophenone compounds, thioxanthone compounds, and at least one compound selected from the group consisting of phosphine oxide compounds.
Further, the photopolymerization initiator can be appropriately selected according to the composition of the nail cosmetic. Specifically, the photopolymerization initiator to be used is preferably selected so as to be dissolved in a specific compound, an ethylenically unsaturated compound other than the specific compound described below, and / or a solvent.

These photopolymerization initiators may be used alone or in combination of two or more.
The content of the photopolymerization initiator in the nail cosmetic of the present invention is preferably 0.1 to 20% by mass, more preferably 0.5 to 15% by mass, and more preferably 1 to 10% by mass with respect to the total mass of the nail cosmetic. % Is particularly preferred. It is excellent in the adhesiveness of hardened | cured material as it is the said range.

<Polymer and / or oligomer>
The nail cosmetic of the present invention preferably contains a polymer and / or an oligomer.
The weight average molecular weight of the polymer and / or oligomer used in the present invention is preferably 2,000 to 300,000, more preferably 3,000 to 200,000, and more preferably 4,000 to 150,000. More preferably, it is 5,000 or more and 100,000 or less. It is excellent in the adhesiveness and temporal stability of the hardened | cured material as it is the said range.
In the present invention, those having a weight average molecular weight of 2,000 or more and less than 5,000 are referred to as oligomers, and those having a weight average molecular weight of 5,000 or more are referred to as polymers.
In the present invention, the weight average molecular weight of the polymer and oligomer is measured by a gel permeation chromatography method using a polystyrene standard or a polyethylene oxide standard.

There is no restriction | limiting in particular about the structure of the polymer and / or oligomer which can be used for this invention, What is necessary is just an arbitrary structure. Examples thereof include a chain structure, a branched (branched) structure, a star structure, a crosslinked structure, and a network structure.
The type of polymer and / or oligomer is not particularly limited, and known polymer species (poly (meth) acrylic acid ester, poly (meth) acrylic acid amide, polyurethane, polyester, polyether, polyurea, polycarbonate, polyamide, polystyrene) , Polyalkylene, polyvinyl and the like).
The polymer and / or oligomer preferably has an ethylenically unsaturated group capable of radical polymerization.
The polymer and / or oligomer is preferably a polymer and / or oligomer having a structure represented by the following formula C-1, and a polymer having a structure represented by the formula C-1 in the polymer main chain and Particularly preferred is an oligomer. Adhesiveness is particularly excellent in the above embodiment.

The wavy line parts independently represent the coupling position with other structures.

Specific examples of the polymer and / or oligomer used in the present invention are shown below, but the present invention is not limited thereto.

The numerical value described in each unit column in Table 1 represents the molar ratio of monomer units derived from the compounds forming each unit.
The detail of the compound which forms each unit of Table 1 is shown below.
TDI: Tolylene diisocyanate Diol-9: 2,2-bis (4-hydroxycyclohexyl) propane Diol-5: Polybutylene glycol (Mw: 2,000)
HEMA: 2-hydroxyethyl methacrylate HPMA: 2-hydroxypropyl methacrylate MDI: bis (4-isocyanatophenyl) methane HDI: hexamethylene diisocyanate Diol-6: polypropylene glycol (Mw: 1,000)
Diol-10: glycerin monomethacrylate MMA: methyl methacrylate BMA: n-butyl methacrylate ADPA: adipic acid dichloride Diol-5 ′: 1,4-butanediol nitrocellulose: DHX40-70 (manufactured by Inabata Sangyo Co., Ltd.)
Diamin-2: Polypropylene glycol diamine (Mw: 2,000)

The polymer and / or oligomer used in the present invention is preferably a polymer and / or oligomer having an amino group.
As the amino group, any of primary, secondary, and tertiary amino groups can be used. However, ease of production of the polymer and / or oligomer, adhesion and removability of the resulting cured film, and From the viewpoint of stability over time, a tertiary amino group is preferable.
The introduction position of amino groups, particularly tertiary amino groups, in the polymer and / or oligomer may be any of the side chain, the inside of the main chain, and the end of the main chain, and may be introduced at two or more positions.
The tertiary amino group is preferably a group represented by the following formula C-2 or C-3.

In formula C-2, R ^C1 and R ^C2 each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, L ^C1 represents a divalent linking group, R ^C1 , R ^C2 and L ^C1 At least two members selected from the group consisting of these groups may be linked to each other to form a ring, and the wavy line portion represents a bonding position with another structure.
In Formula C-3, R ^C3 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, L ^C2 and L ^C3 each independently represent a divalent linking group, and R ^C3 , L ^C2 and L ^{C3 At} least two members selected from the group consisting of ^C3 may be connected to each other to form a ring, and each wavy line portion independently represents a bonding position with another structure.

R ^C1 and R ^C2 in formula C-2 are each independently preferably an alkyl group having 1 to 10 carbon atoms from the viewpoint of the balance between solubility in an aqueous acid solution and water resistance, It is more preferably an alkyl group having ˜6, more preferably an alkyl group having 1 to 4 carbon atoms, and particularly preferably an alkyl group having 1 or 2 carbon atoms.
L ^C1 in formula C-2 is a single bond, an alkylene group having 1 to 20 carbon atoms (which may have a substituent, and part of the carbon atoms may be replaced with a hetero atom), carbon And an arylene group having 1 to 20 atoms (which may have a substituent, and some carbon atoms may be replaced by a hetero atom), a single bond, and an alkylene group having 1 to 20 carbon atoms. And preferably an oxyalkylene group having 2 to 20 carbon atoms or a polyoxyalkylene group having 2 to 20 carbon atoms, and an alkylene group having 1 to 20 carbon atoms or a polyoxyalkylene group having 2 to 20 carbon atoms. Is more preferable, an alkylene group having 1 to 20 carbon atoms is particularly preferable, and an alkylene group having 1 to 10 carbon atoms is most preferable.
In the formula C-2, at least two selected from the group consisting of R ^C1 , R ^C2 and L ^C1 may be connected to each other to form a ring.

R ^C3 in formula C-3 is preferably an alkyl group having 1 to 10 carbon atoms from the viewpoint of the balance between solubility in an aqueous acid solution and water resistance, and is an alkyl group having 1 to 6 carbon atoms. More preferably, it is more preferably an alkyl group having 1 to 4 carbon atoms.
L ^C2 and L ^C3 in Formula C-3 are each independently a single bond or an alkylene group having 1 to 20 carbon atoms (which may have a substituent, and some of the carbon atoms are replaced with heteroatoms. And an arylene group having 1 to 20 carbon atoms (which may have a substituent, and some of the carbon atoms may be replaced by a hetero atom). An alkylene group having 1 to 20 carbon atoms, an oxyalkylene group having 2 to 20 carbon atoms, or a polyoxyalkylene group having 2 to 20 carbon atoms is preferable, and an alkylene group having 1 to 20 carbon atoms or 2 to 20 carbon atoms is preferable. More preferably, it is a 20 polyoxyalkylene group, particularly preferably an alkylene group having 1 to 20 carbon atoms, and most preferably an alkylene group having 1 to 10 carbon atoms.
In the formula C-3, at least two selected from the group consisting of R ^C3 , L ^C2 and L ^C3 may be connected to each other to form a ring.

The amine value of the polymer and / or oligomer used in the present invention is preferably 0.1 to 10 mmol / g, more preferably 0.25 to 9 mmol / g, and 0.5 to 8 mmol / g. More preferably it is. It is excellent in adhesiveness and removability as it is the said range.
As a method for measuring the amine value, for example, a sample is weighed in a beaker, acetic acid is added, and the mixture is stirred and dissolved. After adjusting the measurement temperature to 25 ° C., 0.1N perchloric acid acetic acid solution as a titration reagent And can be obtained by titrating with a titration apparatus. The amine value is the amount of perchloric acid consumed when titrated, expressed as the number of moles per gram of sample (solid content).

Specific examples of the polymer and / or oligomer having an amino group used in the present invention are shown below, but the present invention is not limited thereto.

The numerical value described in each unit column in Table 2 represents the molar ratio of the monomer units derived from the compound forming each unit.
The detail of the compound which forms each unit of Table 2 is shown below.
IPDI: isophorone diisocyanate TDI: tolylene diisocyanate HDI: hexamethylene diisocyanate MDI: bis (4-isocyanatophenyl) methane Diol-1: 3-dimethylamino-1,2-propanediol Diol-2: 1,5-pentanediol And 1,6-hexanediol polycarbonate diol (Mw: 2,000)
Diol-3: N-butyldiethanolamine Diol-4: 1,5-pentanediol Diol-5: Polybutylene glycol (Mw: 2,000)
Diol-6: Polypropylene glycol (Mw: 1,000)
Diol-7: 3-diethylamino-1,2-propanediol Diol-8: 1,4-butanediol Diamin-1: 3,3-diamino-N-methyldipropylamine Diamine-2: polypropylene glycol diamine (Mw: 2,000)
ADPA: adipic acid dichloride DMAPAm: 3-dimethylaminopropyl acrylamide CHAm: N-cyclohexyl acrylamide DMAEM: 2-dimethylaminoethyl methacrylate BMA: n-butyl methacrylate HEMA: 2-hydroxyethyl methacrylate IPA: 2-hydroxypropane DMPA: 3- Dimethylaminopropylamine

As the polymer and / or oligomer used in the present invention, a water-soluble polymer and / or oligomer can also be suitably used.
The water-soluble polymer and / or oligomer is preferably a polymer and / or oligomer that dissolves by 0.1 g or more with respect to 100 g of distilled water, more preferably a polymer and / or oligomer that dissolves by 0.2 g or more, and 0.5 g or more. Soluble polymers and / or oligomers are particularly preferred. By having water solubility in the above range, it becomes easy to produce nail cosmetics using water.

Examples of water-soluble polymers and / or oligomers used in the present invention include carboxylic acid (salt) groups, sulfonic acid (salt) groups, phosphoric acid (salt) groups, phosphonic acid (salt) groups, quaternary ammonium bases, hydroxyl groups. A polymer and / or oligomer having a functional group selected from the group consisting of a group, a carboxylic acid amide group, and a polyethylene glycol chain is preferred.
The counter cation of the carboxylic acid (salt) group, sulfonic acid (salt) group, phosphoric acid (salt) group, phosphonic acid (salt) group is an alkali metal cation such as sodium or potassium, or an alkaline earth such as calcium or magnesium. Metal cations, ammonium cations and phosphonium cations are preferred, and alkali metal cations such as sodium and potassium are particularly preferred.
The alkyl group of the ammonium group of the quaternary ammonium base is preferably a methyl group or an ethyl group. The counter anion is preferably a halide ion such as chloride ion or bromide ion, sulfate anion, nitrate anion, phosphate anion, sulfonate anion, carboxylate anion, carbonate anion, halide ion, sulfonate anion, Carboxylic acid anions are particularly preferred.
The substituent on the nitrogen of the carboxylic acid amide group is preferably an alkyl group having 8 or less carbon atoms, and particularly preferably an alkyl group having 6 or less carbon atoms.
The connecting chain length of the polyethylene glycol chain is preferably 2 or more, and particularly preferably 4 or more.

Specific examples of the water-soluble polymer and / or oligomer used in the present invention are shown below, but the present invention is not limited thereto.

The numerical value described in each unit column in Table 3 represents the molar ratio of the monomer units derived from the compounds forming each unit.
The detail of the compound which forms each unit of Table 3 is shown below.
MDI: Bis (4-isocyanatophenyl) methane Diol-6: Polypropylene glycol (Mw: 1,000)
Diol-11: 2,2-bis (hydroxymethyl) propionate sodium Diol-10: glycerol monomethacrylate TDI: tolylene diisocyanate Diol-12: polyethylene glycol (Mw: 2,000)
Diol-9: 2,2-bis (4-hydroxycyclohexyl) propane HEMA: 2-hydroxyethyl methacrylate

The number on the lower right of the parenthesis in the polymer represented by the formula C ′ represents the molar ratio.

The polymer and / or oligomer used in the present invention can be produced by a known method (eg, radical polymerization, polycondensation, etc.).
These polymers and / or oligomers may be used alone or in combination of two or more.
The content of the polymer and / or oligomer in the nail cosmetic used in the present invention is more than 0% by mass, preferably 90% by mass, more preferably 5 to 80% by mass with respect to the total mass of the nail cosmetic. 70 mass% is still more preferable. It is excellent in the adhesiveness and removal property of hardened | cured material as it is the said range.

<An ethylenically unsaturated compound other than a compound having two or more (meth) acrylamide groups>
The ethylenically unsaturated compound other than the compound having two or more (meth) acrylamide groups used in the present invention (hereinafter simply referred to as “other ethylenically unsaturated compound”) has two or more (meth) acrylamide groups. Any compound that is not a compound and has at least one ethylenically unsaturated bond capable of radical polymerization can be suitably used, but an ethylenically unsaturated compound having a molecular weight of 2,000 or less is preferred, An ethylenically unsaturated compound that is liquid at normal temperature and pressure is preferred.
The other ethylenically unsaturated compound is preferably a monofunctional ethylenically unsaturated compound and / or a bifunctional to hexafunctional ethylenically unsaturated compound, and is preferably a monofunctional ethylenically unsaturated compound and / or a bifunctional ethylenically unsaturated compound. It is more preferably a saturated compound, and even more preferably a monofunctional ethylenically unsaturated compound.
Examples of other ethylenically unsaturated compounds used in the present invention include ethylenically unsaturated compounds having an amino group.
As the amino group, any of primary, secondary, and tertiary amino groups can be used. From the viewpoint of the temporal stability of the radical polymerizable monomer and the adhesion and removability of the resulting cured film. Therefore, a tertiary amino group is preferable.
The tertiary amino group is preferably a group represented by the above formula C-2 or C-3.
The other ethylenically unsaturated compound is preferably an ethylenically unsaturated compound having an amino group and a structure represented by the formula C-1. In the above embodiment, adhesion and removability with an aqueous solution are particularly excellent.

Specific examples of the ethylenically unsaturated compound having an amino group used in the present invention include 2-dimethylaminoethyl methacrylate, 3-dimethylaminopropyl acrylamide, 2-diethylaminoethyl methacrylate, 4-dimethylaminomethylstyrene, N-butylbis. (2-methacryloyloxyethyl) amine, 1,2,2,6,6-pentamethyl-4-piperidine methacrylate and the like. However, the present invention is not limited to these.

Moreover, as another ethylenically unsaturated compound used for this invention, the ethylenically unsaturated compound which does not have an amino group is mentioned.
Specific examples of the ethylenically unsaturated compound having no amino group include (meth) acrylic acid; methyl (meth) acrylate, ethyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and 2-hydroxyethyl (meth) acrylate. Monofunctional (meth) acrylic acid esters such as 2-hydroxypropyl (meth) acrylate, glycerin monomethacrylate, isobornyl (meth) acrylate; 2-hydroxyethyl (meth) acrylamide, N, N-dimethylacrylamide, N, N Monofunctional (meth) acrylic amides such as diethyl acrylamide, isopropyl acrylamide, morpholine acrylamide, etc .; N-vinyl amides such as N-vinyl pyrrolidone, N-vinyl caprolactam; styrene, 4-acetoxystyrene, -Styrenes such as carboxystyrene; ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate , Pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, cardoepoxy di Polyfunctional (meth) acrylic esters such as (meth) acrylate and neopentyl glycol di (meth) acrylate; including diisocyanate and hydroxyl group (Meth) urethane (meth) acrylate consisting of acrylic acid derivatives and optionally diols.

Among other ethylenically unsaturated compounds, (meth) acrylic acid, N, N-dimethylacrylamide, N, N-diethylacrylamide, morpholine acrylamide, N-2-hydroxyethyl (meth) acrylamide, N-vinylpyrrolidone, N -Vinylcaprolactam, 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, glycerin monomethacrylate are preferred, (meth) acrylic acid, N, N-dimethylacrylamide, N-2-hydroxyethyl (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, and glycerin monomethacrylate are particularly preferred. The use of the above compound facilitates the production of nail cosmetics because the specific compound dissolves well.

Other ethylenically unsaturated compounds may be used alone or in combination of two or more.
The content of the other ethylenically unsaturated compound in the nail cosmetic of the present invention is preferably more than 0% by mass and more than 90% by mass, more preferably 5 to 80% by mass with respect to the total mass of the nail cosmetic. 70 mass% is still more preferable.
Moreover, the mixing ratio of the compound having two or more (meth) acrylamide groups and the other ethylenically unsaturated compound is two or more (meth) acrylamide groups with respect to 100 parts by mass of the other ethylenically unsaturated compound. The amount of the compound is preferably 5 to 200 parts by mass, more preferably 7 to 150 parts by mass, and still more preferably 10 to 100 parts by mass. Within the above range, the cured product is more excellent in adhesion and removability, and the production of nail cosmetics is facilitated.

<Solvent>
The nail cosmetic of the present invention may contain a solvent in order to dissolve a compound having two or more (meth) acrylamide groups or to adjust the ease of application of the nail cosmetic.
As the solvent, a solvent having a boiling point of 50 to 150 ° C. at 1 atm (1,013.25 hPa) is preferable, and a solvent having a boiling point of 60 to 140 ° C. at 1 atm is more preferable. By using a solvent having a boiling point in the above range, the concentration variation of the nail cosmetic can be suppressed, and drying after application becomes good.
Solvents include alcohols such as water, methanol, ethanol, isopropyl alcohol, 1-propanol, 1-butanol, 2-butanol, t-butyl alcohol, 2-methyl-1-propanol, 1-methoxy-2-propyl alcohol, etc. , Hydrocarbons such as hexane, heptane, toluene, xylene, ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran, dimethoxyethane, diphenyl ether, esters such as methyl acetate, ethyl acetate, butyl acetate, γ-butyrolactone, acetone, Ketones such as methyl ethyl ketone and cyclohexanone, amides such as N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidone and N-ethylpyrrolidone, dimethyl carbonate, diethyl Carbonates such as boronate, propylene carbonate, ureas such as tetramethylurea, 1,3-dimethyl-2-imidazolidinone, halogenated hydrocarbons such as chloroform, dichloromethane, chlorobenzene, triethylamine, acetic acid, acetonitrile, nitromethane, Known solvents such as dimethyl sulfoxide can be mentioned.
Among these solvents, water, methanol, ethanol, isopropyl alcohol, 1-propanol, 1-butanol, 2-butanol, t-butyl alcohol, 2-methyl-1-propanol, 1-methoxy-2-propyl alcohol, acetic acid, And / or acetonitrile is preferable, and water, ethanol, isopropyl alcohol, and / or acetic acid are more preferable. By using the solvent, the compound having two or more (meth) acrylamide groups is easily dissolved, and the production of nail cosmetics is facilitated.

The solvent may contain 1 type individually, or may contain 2 or more types.
The content of the solvent in the nail cosmetic of the present invention is more than 0% by mass, preferably 80% by mass, more preferably 5 to 70% by mass, and still more preferably 10 to 60% by mass with respect to the total mass of the nail cosmetic. . When it is in the above range, the applicability and drying properties of the nail cosmetic are improved.
The mixing ratio of the compound having two or more (meth) acrylamide groups and the solvent is 5 to 200 parts by mass of the compound having two or more (meth) acrylamide groups with respect to 100 parts by mass of the solvent. The amount is preferably 7 to 150 parts by mass, more preferably 10 to 100 parts by mass. When it is in the above range, the production of nail cosmetics becomes easy.

<Other ingredients>
In addition to the above components, a known compound can be added to the nail cosmetic of the present invention as necessary. Specifically, sensitizers, polymerization inhibitors, pigments, dyes, fragrances, ultraviolet (UV) absorbers, antioxidants, fillers, various elastomers, plasticizers, thickeners, thixotropic agents, silane couplings And additives such as an agent, a titanate coupling agent, a chelating agent, a flame retardant, and a surfactant.
The nail cosmetic of the present invention can be produced by mixing the above ingredients by a known method. As a combination of each component of the nail cosmetic of the present invention,
Compound having two or more (meth) acrylamide groups + photopolymerization initiator + polymer and / or oligomer + other ethylenically unsaturated compound,
Compound having two or more (meth) acrylamide groups + photopolymerization initiator + polymer and / or oligomer + solvent,
Compound having two or more (meth) acrylamide groups + photopolymerization initiator + polymer and / or oligomer + other ethylenically unsaturated compound + solvent,
The combination of is preferable. Even when other components are added, they are preferably added to the combination. This combination facilitates the production of nail cosmetics and improves the applicability.

<Nail cosmetic treatment method>
As a nail cosmetic treatment method using the nail cosmetic of the present invention, after applying the nail cosmetic of the present invention on an object such as a nail, a nail coated with other nail cosmetics, an artificial nail, A method of forming a cured product by light irradiation is preferred.
The method for applying the nail cosmetic of the present invention onto an object is not particularly limited and may be carried out by a known method, but a method using a brush or brush, spray coating, ink jet coating, bar Examples include coater coating, spin coating, curtain coating, dip coating, air knife coating, blade coating, and roll coating.
The coating thickness on the object of the nail cosmetic of the present invention varies depending on the use, but is preferably 1 nm to 1 mm, more preferably 10 nm to 0.5 mm, and further preferably 100 nm to 0.25 mm. Within the above range, better adhesion and removability are realized.
There is no restriction | limiting in particular as a method of irradiating light after apply | coating the nail | claw cosmetics of this invention to a target object, For example, a well-known light source (For example, sunlight, a high pressure mercury lamp, a fluorescent lamp, a UV lamp, an LED lamp, LED laser, etc. ) Using a known light irradiation method (for example, full surface exposure, scanning exposure, etc.) can be used. The light irradiation time is not particularly limited as long as the nail cosmetic of the present invention is cured.
As a method of forming a cured product of the nail cosmetic on the object, the above method can be repeated.
The method for removing the cured film obtained by curing the nail cosmetic of the present invention can be removed by a known method. Specifically, a method of polishing with a file, a method of cutting with a sword or knife, a method of peeling or crushing with a stick etc. after covering the cured film with cotton moistened with acetone and leaving it embrittled for several minutes, Examples thereof include a method of immersing in an aqueous solution having a specific pH for several minutes, embrittlement, and then peeling with a tweezers or the like or peeling with a stick, and a method of combining them.
In particular, the method of removing from the nail of the cured film obtained by curing the nail cosmetic of the present invention is a method in which the cured film is covered with cotton moistened with acetone, left to embrittle for several minutes, and then peeled or crushed with a stick or the like. A method of peeling by tweezers or exfoliating with a tweezer or the like after being immersed in an aqueous solution having a specific pH for several minutes, and a method of combining them, and a combination thereof are preferably mentioned. A method of peeling by tweezers or peeling off with a stick after embedding by embedding for several minutes or more preferable.

<Artificial nails>
The artificial nail of the present invention is an artificial nail having a layer formed by the nail cosmetic of the present invention, and an artificial nail having a layer formed by drying and / or photocuring the nail cosmetic of the present invention. It is preferable.
The artificial nail of the present invention is suitable for nail polish such as manicure and pedicure, and gel nail.
The artificial nail of the present invention only needs to be at least partially formed of the nail cosmetic of the present invention, and may have other layers and structures, and the entire artificial nail is formed of the nail cosmetic of the present invention. May be.
The layer formed of the nail cosmetic of the present invention can be suitably used for any of the primer layer, base layer, color layer, and / or top layer in the artificial nail of the present invention.
In addition, the artificial nail of the present invention may have only one layer formed by the nail cosmetic of the present invention, or may have two or more layers.
Among these, from the viewpoint of removability, at least one layer formed from the nail cosmetic of the present invention is preferably a layer in contact with the nail.
Further, the thickness of the layer formed by the nail cosmetic of the present invention in the artificial nail of the present invention is not particularly limited, but is preferably 10 to 2,000 μm, and more preferably 20 to 1,500 μm. More preferred is 20 to 1,000 μm.

<Nail Art Kit>
The nail art kit of the present invention includes the nail cosmetic of the present invention, and preferably includes the nail cosmetic of the present invention and one or more tools for applying them to the nails.
The preferred embodiments of the nail cosmetic of the present invention in the nail art kit of the present invention are the same as those described above.
Specific examples of tools for performing treatment on nails include removal liquids for removing artificial nails, nail cosmetics other than the nail cosmetics of the present invention, such as for collars and tops, nail files such as files, and nail cosmetics Brushes and brushes such as flat brushes, UV light exposure devices, wiping or cleaning liquids, wiping wipes, nail brushes, dust brushes, nail foams used for lengthening nails, acrylic resin Decorative stones made of glass, metal or natural stone, nail seals, decorative powders such as glitter and holograms, cutters, spatulas, sticks, tweezers, separators that increase finger spacing to prevent contact between nails Although it is mentioned, although it is not restricted to these, it is preferable to contain a removal liquid at least.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to the forms in these examples. Unless otherwise specified, “part” and “%” are based on mass.
The compounds 1-a, 1-b, 1-c, 1-g, 1-h, 1-i, 2-a, 2-b, 2-c, 2-d, 2- e, 2-h, 3-a, 3-h, 4-a and 4-e are the above-mentioned compounds 1-a, 1-b, 1-c, 1-g, 1-h, 1-i, 2-a, 2-b, 2-c, 2-d, 2-e, 2-h, 3-a, 3-h, 4-a and 4-e are the same compounds.
The polymer P-9 used in the examples is the same polymer as the polymer P-9 described above.

(Example 1 and Comparative Example 1)
1. Preparation of nail cosmetics After containing the composition described below in a container equipped with a stirring device, the nail cosmetics 1 and 2 were obtained by mixing until uniform using a stirring device.

<Nail cosmetic 1>
Compound 1-a: 10 parts by mass 1-hydroxycyclohexyl phenyl ketone (photopolymerization initiator, manufactured by Ciba, IRGACURE 184): 8 parts by mass Diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (photopolymerization) Initiator, manufactured by BASF, Lucillin TPO): 2 parts by mass, polymer P-1: 100 parts by mass, 2-hydroxyethyl acrylate: 42 parts by mass, acrylic acid: 14 parts by mass, N, N-dimethylacrylamide: 14 parts by mass Part

<Nail cosmetic 2>
Hydroxyethyl acrylamide: 10 parts by mass 1-hydroxycyclohexyl phenyl ketone (photopolymerization initiator, Ciba, IRGACURE 184): 8 parts by mass Diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (initiated photopolymerization) Agent, manufactured by BASF, Lucillin TPO): 2 parts by mass, polymer P-1: 100 parts by mass, isobornyl methacrylate: 35 parts by mass, bisphenol A-ethylene oxide (EO) adduct diacrylate (Osaka Organic Chemical Industry) Co., Ltd., EO repetition number n = 2): 30 parts by mass

2. Formation of base layer (base layer) Next, nail cosmetic 1 or 2 was applied to the nail of the hand with a brush, and then photocured (60-second exposure) using a gel nail UV device (36W). Each of the underlayers was formed. Each of the formed underlayers had a thickness of about 100 μm.

3. Formation of gel nail layer Next, after applying commercially available calgel # CG-03 fresh pink (manufactured by Mogabrook Co., Ltd.) with a brush to the obtained underlayer, irradiation was performed with a UV device ultraviolet lamp (36 W) exclusively for gel nail for 1 minute. did. Thereafter, a commercially available top gel (manufactured by Mogabrook Co., Ltd.) was applied as a top layer with a brush and similarly irradiated with an ultraviolet lamp (36 W) for 2 minutes. When the formed gel nail layer was visually observed, it was completely solidified. The total thickness of the color layer and the top layer was about 250 μm.

4). Evaluation (1) Adhesiveness (1) -1 External Resistance The adhesiveness of the obtained nail / underlayer / gel nail layer laminate was evaluated from the viewpoint of external resistance. That is, the change of the tip after rubbing the tip of the nail provided with the base layer and the gel nail layer 30 times on a commercially available rubber sheet was evaluated according to the following criteria. Table 4 shows the obtained results. In addition, none of the peeling between the underlayer and the gel nail layer was confirmed.
4: No change in appearance was confirmed.
3: Slight peeling was confirmed between the nail and the base layer.
2: Partial peeling was confirmed between the nail and the base layer, and whitening was confirmed in part of the appearance.
1: Remarkable peeling was confirmed between the nail and the base layer, and whitening was confirmed in the entire appearance.

(1) -2 Warm-resistant water Further, the adhesion of the obtained nail / underlayer / gel nail layer laminate was evaluated from the viewpoint of warm water. That is, the hands with the base layer and the gel nail layer formed on the nails are usually washed with warm water of about 40 ° C. without using soap, and after the washing is finished, the hands are wiped with a towel material. It was performed 30 times a day, and the appearance change after this was continued for 7 days was evaluated according to the following criteria. Table 4 shows the obtained results. In addition, none of the peeling between the underlayer and the gel nail layer was confirmed.
4: No change in appearance was confirmed.
3: Slight peeling was confirmed between the nail and the base layer.
2: Partial peeling was confirmed between the nail and the base layer, and whitening was confirmed in part of the appearance.
1: Remarkable peeling was confirmed between the nail and the base layer, and whitening was confirmed in the entire appearance.

(1) -3 Soap Resistance The adhesion of the obtained nail / underlayer / gel nail layer laminate was evaluated from the viewpoint of soap resistance. That is, using a medicinal soap Muse (registered trademark) (manufactured by Rekit Benkieser Japan Co., Ltd.) with water of about 40 ° C. in a state where the base layer and the gel nail layer are formed on the nails. Then, after the washing was completed, the work of wiping with a towel material was performed 30 times a day, and the appearance change after continuing this for 3 days was evaluated according to the following criteria. Table 4 shows the obtained results. In addition, none of the peeling between the underlayer and the gel nail layer was confirmed.
4: No change in appearance was confirmed.
3: Slight peeling was confirmed between the nail and the base layer.
2: Partial peeling was confirmed between the nail and the base layer, and whitening was confirmed in part of the appearance.
1: Remarkable peeling was confirmed between the nail and the base layer, and whitening was confirmed in the entire appearance.

(2) Peelability The peelability of the obtained nail / underlayer / gel nail layer laminate was evaluated. That is, the nail | claw in which the base layer and the gel nail layer were formed was wound with a cloth containing acetone and allowed to stand for 15 minutes, and then lightly rubbed with a commercially available orange stick to confirm whether it could be peeled off. When the same operation was regarded as one cycle and peeling was not possible, the same cycle was repeated and evaluated according to the following criteria in cycles necessary until peeling. Table 4 shows the obtained results. In addition, none of the peeling between the underlayer and the gel nail layer was confirmed.
The laminate of the underlayer and the gel nail layer peeled from the nail in a cycle of 4: 1 times.
3: The laminate of the base layer and the gel nail layer peeled from the nail in two cycles.
2: The laminate of the base layer and the gel nail layer peeled from the nail in three cycles.
1: The laminate of the base layer and the gel nail layer did not peel from the nail even after three cycles.

(Examples 2 to 16)
A nail cosmetic was prepared in the same manner as in nail cosmetic 1, except that compound 1-a was changed to the compounds shown in Table 5, and evaluated in the same manner as in Example 1. The results are shown in Table 5.

(Example 17 and Comparative Example 2)
The composition described below was placed in a container equipped with a stirring device, and then mixed until uniform using a stirring device to obtain nail cosmetic 3.

<Nail cosmetic 3>
Compound 1-a: 80 parts by mass 1- [4- (2- (2-hydroxyethoxy) ethoxy) phenyl] -2-hydroxy-2-methyl-1-propan-1-one (Japanese Patent Laid-Open No. 2000-186242) ): 11 parts by mass, polymer P-23: 100 parts by mass, water: 165 parts by mass, 2-propanol: 12 parts by mass

<Formation of base layer (base layer)>
0.25 g of the obtained nail cosmetic 3 was applied onto an aluminum substrate shaped like a nail using a brush, and irradiated with an ultraviolet lamp (36 W) for 2 minutes. Thus, an aluminum base material on which an underlayer was formed was produced.
After the surface of the underlayer was washed with ethanol in order to measure the cured film thickness, the formed film was visually observed to be completely solidified. The film thickness at this time was about 150 μm (± 10 μm).

<Formation of gel nail layer>
A commercially available calgel # CG-03 fresh pink (manufactured by Mogabrook Co., Ltd.) was applied as a color layer to the aluminum base material on which the underlayer was formed with a brush and irradiated with an ultraviolet lamp (36 W) for 1 minute. Thereafter, a commercially available top gel (manufactured by Mogabrook Co., Ltd.) was applied as a top layer with a brush and similarly irradiated with an ultraviolet lamp (36 W) for 2 minutes. In this way, an aluminum substrate 1 having a gel nail layer having the nail cosmetic 3 as a base layer was produced. When the formed gel nail layer was visually observed, it was completely solidified. The total film thickness of the color layer and the top layer was about 250 μm.
In the same manner, an aluminum base material 2 using the nail cosmetic 2 as a base layer was produced, and adhesion and peelability were evaluated by the same method as described above. The results are shown in Table 6.

(Example 18 and Comparative Example 3)
The composition described below was accommodated in a container equipped with a stirring device, and then mixed until uniform using a stirring device to obtain nail cosmetic 4.

<Nail cosmetic 4>
Compound 1-a: 10 parts by mass Diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (BASF Corp., Lucyrin TPO): 11 parts by mass Polymer P-16: 100 parts by mass 2-hydroxyethyl Acrylate: 42 parts by mass Acrylic acid: 14 parts by mass N, N-dimethylacrylamide: 14 parts by mass

<Formation of base layer (base layer)>
The obtained nail cosmetic 4 was applied to a 0.25 g nail-shaped aluminum substrate using a brush and irradiated with an ultraviolet lamp (36 W) for 2 minutes. Thus, an aluminum base material on which an underlayer was formed was produced.
After the surface of the underlayer was washed with ethanol in order to measure the cured film thickness, the formed film was visually observed to be completely solidified. The film thickness at this time was about 150 μm (± 10 μm).

<Formation of gel nail layer>
A commercially available calgel # CG-03 fresh pink (manufactured by Mogabrook Co., Ltd.) was applied as a color layer to the aluminum base material on which the underlayer was formed with a brush and irradiated with an ultraviolet lamp (36 W) for 1 minute. Thereafter, a commercially available top gel (manufactured by Mogabrook Co., Ltd.) was applied as a top layer with a brush and similarly irradiated with an ultraviolet lamp (36 W) for 2 minutes. In this way, an aluminum substrate 3 provided with a gel nail layer having the nail cosmetic 4 as a base layer was produced. When the formed gel nail layer was visually observed, it was completely solidified. The total film thickness of the color layer and the top layer was about 250 μm.
Similarly, an aluminum base material 2 using the nail cosmetic 2 as a base layer was produced, and adhesion was evaluated by the same method as described above. The peelability was evaluated by the following method. The results are shown in Table 7.

<Peelability>
The surface of the gel nail layer and the tip of the obtained aluminum substrate are scratched with a file (file for nails). Then, it is immersed in the removal liquid (40 ° C.) described below for 2 minutes, and after 2 minutes, it is peeled off using a wooden spatula during immersion, and the ease of removal from the substrate is determined according to the following evaluation criteria. evaluated.
-Evaluation criteria-
4: Easily removable.
3: Removal was possible.
2: Although removal was possible, some remaining film remained and wiped off using the removal liquid.
1: It was not removable.

Claims (14)

1. A nail cosmetic comprising a compound having two or more (meth) acrylamide groups.
2. The nail cosmetic according to claim 1, wherein the compound having two or more (meth) acrylamide groups is a compound represented by any one of the following formulas 1 to 4.
   

   

   In Formula 1, each R independently represents a hydrogen atom or a methyl group, each R ^a independently represents ^a hydrogen atom, an alkyl group, an aryl group, or a heterocyclic group, and each L ^a independently represents ^a single bond or Z represents ^a q + 1 valent organic group, and q represents an integer of 1 to 6.
   

   

   In Formula 2, each R ⁵ independently represents a hydrogen atom or a methyl group, each L ^b independently represents an alkylene group having 1 to 8 carbon atoms, and k and p each independently represents 0 or 1 J represents an integer of 0 to 8 independently.
   

   

   In Formula 3, each R ⁷ independently represents a hydrogen atom or a methyl group, each t independently represents an integer of 1 to 8, and u represents an integer of 0 to 5.
   

   

   In Formula 4, Z ^b represents a residue obtained by removing v hydrogen atoms from the hydroxyl group of the polyol, v represents an integer of 3 to 6, R ⁸ independently represents a hydrogen atom or a methyl group, L Each ^c independently represents an alkylene group having 1 to 8 carbon atoms.
3. The nail cosmetic according to claim 2, wherein the compound having two or more (meth) acrylamide groups is a compound represented by the formula 1.
4. The nail cosmetic according to claim 2, wherein the compound having two or more (meth) acrylamide groups is a compound represented by the formula 2.
5. The nail cosmetic according to any one of claims 1 to 4, further comprising a photopolymerization initiator.
6. The nail according to claim 5, wherein the photopolymerization initiator is at least one compound selected from the group consisting of an acetophenone compound, a benzophenone compound, a thioxanthone compound, a phosphine oxide compound, a metallocene compound, and a lophine dimer compound. Cosmetics.
7. The nail cosmetic according to any one of claims 1 to 6, further comprising a polymer and / or an oligomer.
8. The nail cosmetic according to claim 7, wherein the polymer and / or oligomer is a polymer and / or oligomer having a structure represented by the following formula C-1 and / or an amino group.
   

   

   In formula C-1, each wavy line portion independently represents a bonding position with another structure.
9. The nail cosmetic according to any one of claims 1 to 8, further comprising an ethylenically unsaturated compound other than the compound having two or more (meth) acrylamide groups.
10. The ethylenically unsaturated compound is acrylic acid, methacrylic acid, N, N-dimethylacrylamide, N, N-diethylacrylamide, morpholine acrylamide, N-hydroxyethylacrylamide, N-vinylpyrrolidone, N-vinylcaprolactam, 2-hydroxy Ethyl acrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate, 4-hydroxybutyl acrylate The nail cosmetic according to claim 9, comprising at least a compound selected from the group consisting of glycerin monomethacrylate.
11. The nail cosmetic according to any one of claims 1 to 10, further comprising a solvent.
12. The solvent is water, methanol, ethanol, isopropanol, 1-propanol, 1-butanol, 2-butanol, t-butyl alcohol, 2-methyl-1-propanol, 1-methoxy-2-propanol, acetic acid, and acetonitrile. The nail cosmetic according to claim 11, comprising at least a compound selected from the group consisting of:
13. An artificial nail having a layer formed from the nail cosmetic according to any one of claims 1 to 12.
14. A nail art kit comprising the nail cosmetic according to any one of claims 1 to 12.