Artificial nail composition

Abstract

To provide an artificial nail composition capable of expressing preferable appearance and design with depth.SOLUTION: An artificial nail composition contains a component (A) polymerizable compound, a component (B) powder containing a component having ferromagnetism, and a component (C) polymerization initiator, has a surface unpolymerized rate when being polymerized and cured in the atmosphere of equal to or less than 3.0 wt.%, and has a visible light transmittance of a cured body of equal to or greater than 30.0%.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an artificial nail composition that has excellent aesthetic appearance. [Background technology]

[0002] Among artificial nails, such as nail polish, gel nails, and acrylic nails, gel nails are widely popular due to their ease of use and the ability to create a variety of art designs. Gel nails generally consist of a base layer applied directly to the nail, a color layer applied on top of the base layer to impart aesthetic appeal and design, and a top layer applied on top of the color layer to impart surface shine and durability. In recent years, magnetic color gels containing magnetic powder that reacts to magnets have become popular as a method for enhancing the aesthetic appeal and design of the color layer. After applying the magnetic color gel, a magnet can be used to move and orient the magnetic powder in the gel, imparting unique aesthetic appeal and design. However, conventional magnetic color gels have high opacity, which prevents them from imparting a sense of depth and limits their application to flat designs. Furthermore, because magnetic color gels are sold as a mixture of color gel and magnetic powder, the colors available for nail art are limited. Furthermore, in order to achieve a unique aesthetic look by incorporating magnetic powder into color gel, the color development must be comparable to that of the parent color gel. For this reason, there has been a tendency to use a large amount of magnetic powder, but magnetic powder is very expensive, which has caused problems in terms of cost. Although no attempt to solve this problem has been proposed so far, a technology for improving the aesthetics and design of color gel is known, as exemplified in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-103563 Summary of the Invention [Problem to be solved by the invention]

[0004] The artificial nail composition of Patent Document 1 has the characteristic of changing color tone with temperature, but does not mention the use of magnetic powder as described above to improve aesthetics and design.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an artificial nail composition that can express a profound aesthetic appearance and design. [Means for solving the problem]

[0006] Means for solving the above problems include the following aspects. <1> Component (A) Polymerizable compound Component (B) Powder containing a ferromagnetic component Component (C) Polymerization initiator The artificial nail composition contains the above-mentioned compound, and when polymerized and cured in the atmosphere, the surface unpolymerized rate is 3.0% by weight or less, and the cured product has a visible light transmittance of 30.0% or more. <2> The polymerizable compound of component (A) is at least one selected from the group consisting of a compound having a urethane bond in the molecule and a polymerizable monomer having an ethylenically unsaturated group. <1> The artificial nail composition according to claim 1. <3> The powder containing the component (B) having ferromagnetic properties is a powder containing at least one selected from the group consisting of iron, nickel, cobalt, and gadolinium. <1> The artificial nail composition according to claim 1. <4> The 50% particle size of the powder containing the component (B) having ferromagnetic properties is 0.1 to 150 μm. <1> The artificial nail composition according to claim 1. <5> The component (C) polymerization initiator is a photopolymerization initiator. <1> The artificial nail composition according to claim 1. <6> The component (C) polymerization initiator is at least one selected from the group consisting of acylphosphine oxides and hydroxyalkylphenones. <1> The artificial nail composition according to claim 1. <7> When polymerized and cured in the atmosphere, the surface unpolymerized rate is 1.0% by weight or less <1> The artificial nail composition according to claim 1. <8> The visible light transmittance of the cured product is 50.0% or more <1> The artificial nail composition according to claim 1. <9> Component (A) polymerizable compound 20.0~95.0% by mass, Component (B) 0.01 to 5.0 mass% of a powder containing a component having ferromagnetic properties; Component (C) Polymerization initiator 0.1 to 10.0 mass% Contains <1> The artificial nail composition according to claim 1. <10> Further containing component (D) a curing accelerator <1> The artificial nail composition according to claim 1. <11> The component (D) curing accelerator is at least one selected from the group consisting of thiol compounds and tertiary amines. <10> Artificial nail composition. <12> The content of component (D) curing accelerator is within the range of 1.0 to 50.0% by mass of the total artificial nail composition. <10> The artificial nail composition according to claim 1. <13> Further contains component (E) thickener <1> The artificial nail composition according to claim 1. <14> The thickener component (E) is at least one selected from the group consisting of silica, alumina, cellulose derivatives, sugars, and resins. <13> The artificial nail composition according to claim 1. <15> The content of component (E) thickener is within the range of 0.1 to 20.0% by mass of the total composition. <13> The artificial nail composition according to claim 1. <16> <1> An artificial nail obtained from the artificial nail composition described in claim 1. <17> <1> 1. A method for producing an artificial nail, comprising the steps of applying the artificial nail composition described in 1. to a nail or a substrate and curing the composition. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide an artificial nail composition that can express a profound aesthetic and design. [Brief explanation of the drawings]

[0008] [Figure 1] Photograph of the cured product of the artificial nail composition of Example 4 (pink beige base) [Figure 2] Photograph of the cured product of the artificial nail composition of Example 4 (clear base) [Figure 3] Photograph of the cured product of the artificial nail composition of Comparative Example 1 (pink beige base) [Figure 4] Photograph of the cured product of the artificial nail composition of Comparative Example 1 (clear base) DETAILED DESCRIPTION OF THE INVENTION

[0009] The artificial nail composition of the present invention comprises component (A) a polymerizable compound, component (B) a powder containing a ferromagnetic component, and component (C) a polymerization initiator, and is characterized in that when polymerized and cured in the atmosphere, the surface unpolymerization rate is 3.0% by weight or less, and the cured product has a visible light transmittance of 30.0% or more. The artificial nail composition of the present invention is described in detail below.

[0010] [(A) Polymerizable compound] The polymerizable compound (component (A)) in the artificial nail composition of the present invention is a substance that reacts with light or heat to form a polymer. The polymerizable compound imparts properties such as curability, surface hardness, strength, flexibility, durability, and removability to the artificial nail composition of the present invention. The polymerizable compound is not particularly limited as long as it is a compound (e.g., polymerizable monomer, oligomer, polymer, etc.) having at least one ethylenically unsaturated group as a polymerizable functional group, and known polymerizable compounds can be used. Specific examples of ethylenically unsaturated groups include, but are not limited to, (meth)acryloyl groups, (meth)acryloyloxy groups, (meth)acrylamide groups, isoprenyl groups, vinyl groups, vinyl ether groups, methyl vinyl ether groups, allyl groups, allyl ether groups, and maleimide groups. The ethylenically unsaturated group may be one type or two or more types. Among these, from the viewpoints of curability, surface hardness, and durability, at least one selected from the group consisting of a (meth)acryloyl group, a (meth)acryloyloxy group, and a (meth)acrylamide group is preferred, and one selected from a (meth)acryloyl group or a (meth)acryloyloxy group is particularly preferred.

[0011] In this specification, the term (meth)acryloyl includes both acryloyl and methacryloyl, the term (meth)acrylate includes both acrylate and methacrylate, the term (meth)acryloyloxy includes both acryloyloxy and methacryloyloxy, and the term (meth)acrylamide includes both acrylamide and methacrylamide.

[0012] Examples of polymerizable compounds having one ethylenically unsaturated group per molecule include methacrylic acid, acrylic acid, urethane (meth)acrylate, urethane (meth)acrylamide, methoxyethylene glycol (meth)acrylate, methoxypolyethylene glycol (meth)acrylate, ethoxyethylene glycol (meth)acrylate, ethoxypolyethylene glycol (meth)acrylate, phenoxyethylene glycol (meth)acrylate, phenoxypolyethylene glycol (meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, 2-(meth)acryloyloxyethyl succinate, 2-(meth)acryloyloxyethyl phthalate, 4-(meth)acryloyloxyethyl trimellitate, 2-(meth)acryloyloxypropyl hexaphthalate, stearyl (meth)acrylate, methyl (meth)acrylate, ethyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl methyl ... Examples of the polymerizable monomer include, but are not limited to, polymerizable monomers such as propyl (meth)acrylate, 3-chloro-2-hydroxypropyl (meth)acrylate, isobornyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, 2-(meth)acryloyloxyethyl dihydrogen phosphate, 2-(meth)acryloyloxyethyl phenyl hydrogen phosphate, 10-(meth)acryloyloxydecyl dihydrogen phosphate, 6-(meth)acryloyloxyhexyl dihydrogen phosphate, 2-(meth)acryloyloxyethyl 2-bromoethyl hydrogen phosphate, (meth)acrylamide, methylol (meth)acrylamide, dimethyl (meth)acrylamide, hydroxyethyl (meth)acrylamide, (meth)acryloylmorpholine, and vinyl chloride, and anhydrides thereof; oligomers of the above polymerizable monomers; and polymers of the above polymerizable monomers. The oligomer and polymer may contain one or more of the above-exemplified polymerizable monomers.

[0013] In this specification, the term oligomer means a polymer formed by polymerizing two to several tens of polymerizable monomers, and the term polymer means a polymer other than an oligomer formed by polymerizing several tens or more of polymerizable monomers.

[0014] Examples of polymerizable compounds having two ethylenically unsaturated groups in one molecule include urethane di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,10-decanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 2-methyl-1,8-octanediol di(meth)acrylate, glycerin di(meth)acrylate, ethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, and polypropylene glycol di(meth)acrylate. Examples of polymerizable monomers include, but are not limited to, polymerizable monomers such as bisphenol A di(meth)acrylate, ethoxylated polypropylene glycol di(meth)acrylate, ethoxylated propylene glycol di(meth)acrylate, ethoxylated bisphenol A di(meth)acrylate, propoxylated bisphenol A di(meth)acrylate, propoxylated ethoxylated bisphenol A di(meth)acrylate, isoprenyl (meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, and bis[2-(methacryloyloxy)ethyl]phosphate, anhydrides thereof, and (meth)acrylamide compounds thereof; oligomers of the above polymerizable monomers; and polymers of the above polymerizable monomers. The oligomers and polymers may contain one or more of the above-exemplified polymerizable monomers.

[0015] Examples of polymerizable compounds having three or more ethylenically unsaturated groups in one molecule include urethane tri(meth)acrylate, urethane tetra(meth)acrylate, urethane penta(meth)acrylate, urethane hexa(meth)acrylate, trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, ethoxylated glycerin tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, propoxylated pentaerythritol tetra(meth)acrylate, ethoxylated pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, )acrylate, ethoxylated isocyanuric acid tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, tetramethylolmethane tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, caprolactone-modified pentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and caprolactone-modified pentaerythritol hexa(meth)acrylate, and (meth)acrylamide compounds thereof; oligomers of the above polymerizable monomers; polymers of the above polymerizable monomers, etc., but are not limited thereto. The oligomers and polymers may contain one or more of the above-exemplified polymerizable monomers.

[0016] The molecular weight of the polymerizable monomer is not particularly limited, but is preferably less than 1,000. The weight-average molecular weight (Mw) of the oligomer is not particularly limited, but is, for example, 200 to 100,000, preferably 200 to 50,000, more preferably 300 to 30,000, and particularly preferably 700 to 10,000. The weight-average molecular weight (Mw) of the polymer is not particularly limited, but is preferably 30,000 or greater. Within this range, properties such as curability, surface hardness, strength, flexibility, and durability can be improved. In this specification, the weight-average molecular weight (Mw) is measured by gel permeation chromatography (GPC) using polystyrene as a standard.

[0017] The polymerizable monomer is preferably liquid and has fluidity at 23° C. Specifically, the polymerizable monomer is preferably liquid at 23° C. and a shear rate of 10 s as measured using a rheometer, which is a dynamic viscoelasticity measuring device. -1 The viscosity at 23°C is preferably 20,000 mPa·s or less, more preferably 10,000 mPa·s or less, even more preferably 5,000 mPa·s or less, and particularly preferably 1,000 mPa·s or less. The oligomer may or may not have fluidity in an atmosphere at 23°C. Specifically, the oligomer has a viscosity at 23°C, a shear rate of 10 s, as measured using a rheometer, which is a dynamic viscoelasticity measuring device. -1 The viscosity at 23°C is preferably 7,000 mPa·s or more, more preferably 7,000 to 3,000,000 mPa·s, still more preferably 7,000 to 2,500,000 mPa·s, and particularly preferably 7,000 to 2,200,000 mPa·s. The polymer may or may not have fluidity in an atmosphere at 23°C.

[0018] Two or more polymerizable compounds may be selected to form a photocurable artificial nail composition. Among the above-listed examples, it is preferable to use at least one selected from the group consisting of methacrylic acid, acrylic acid, urethane (meth)acrylate, urethane di(meth)acrylate, urethane tri(meth)acrylate, urethane tetra(meth)acrylate, urethane penta(meth)acrylate, urethane hexa(meth)acrylate, urethane di(meth)acrylamide, isobornyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, hydroxypropyl (meth)acrylate, triethylene glycol di(meth)acrylate, (meth)acryloylmorpholine, bis[2-(methacryloyloxy)ethyl]phosphate, trimethylolpropane tri(meth)acrylate, oligomers thereof, and polymers thereof. The oligomers and polymers may contain one or more of the above-listed polymerizable monomers as structural units. Furthermore, the polymerizable compound more preferably contains the oligomer and the polymerizable monomer, and further preferably contains at least one oligomer selected from the group consisting of urethane (meth)acrylate oligomer, urethane di(meth)acrylate oligomer, urethane hexa(meth)acrylate oligomer, and urethane di(meth)acrylamide, and at least one polymerizable monomer selected from the group consisting of isobornyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, hydroxypropyl (meth)acrylate, triethylene glycol di(meth)acrylate, (meth)acryloylmorpholine, and trimethylolpropane tri(meth)acrylate, and particularly preferably contains a urethane di(meth)acrylate oligomer and at least one polymerizable monomer selected from the group consisting of isobornyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, and trimethylolpropane tri(meth)acrylate. When the polymerizable compound contains the oligomer and the polymerizable monomer, it is possible to improve properties such as flexibility, durability, curability, surface hardness, and strength.

[0019] Although there are no particular limitations on the content of the polymerizable compound, the content of the polymerizable compound relative to the total amount of the composition is preferably 20% by mass or more, more preferably within the range of 40 to 99% by mass, even more preferably within the range of 50 to 95% by mass, even more preferably within the range of 60 to 95% by mass, even more preferably within the range of 70 to 95% by mass, and particularly preferably within the range of 70 to 90% by mass. By keeping the content of the polymerizable compound within the above range, properties such as flexibility, durability, curability, surface hardness, and strength can be improved.

[0020] When the polymerizable compound contains an oligomer and a polymerizable monomer, the content of the oligomer is typically about 10 to 1,000 parts by mass per 100 parts by mass of the polymerizable monomer. From the viewpoint of improving properties such as flexibility, durability, curability, surface hardness, and strength, the content is preferably 50 to 750 parts by mass. From the viewpoint of obtaining improved effects of thermal pain suppression and color stability in addition to properties such as flexibility, durability, curability, surface hardness, and hardness, the content is more preferably 100 to 350 parts by mass, even more preferably 100 to 300 parts by mass, and particularly preferably 150 to 250 parts by mass. Furthermore, when the artificial nail composition contains a polymerizable curing accelerator, which will be described later, the preferred content of the oligomer is calculated as the content relative to the total of the polymerizable monomer and the curing accelerator.

[0021] [(B) Powder containing a ferromagnetic component] The powder containing a ferromagnetic component (B) in the artificial nail composition of the present invention is a powder containing a component that exhibits ferromagnetic properties due to spontaneous magnetization at or near room temperature, and can be used without particular limitations as long as it can be moved by an external magnetic field such as a commonly available ferrite magnet or neodymium magnet. The term "ferromagnetic" as used here means ferromagnetism in a broad sense, and includes both ferromagnetism and ferrimagnetism.

[0022] Specific examples of ferromagnetic components include, but are not limited to, iron, nickel, cobalt, and gadolinium. Furthermore, substances containing ferromagnetic components include, but are not limited to, iron oxide, nickel oxide, ferrite, iron alloys, magnetite, and magnetite. Among these, it is preferable to use a powder containing at least one of iron, nickel, and cobalt, because they are relatively easy to produce and obtain and exhibit stable ferromagnetism at room temperature. It is also possible to use a mixture of two or more of these powders.

[0023] Although there are no particular limitations on the content of the powder containing component (B) having ferromagnetic properties, it is preferably 0.001% by mass or more, 0.05% by mass or more, or 0.1% by mass or more relative to the total amount of the composition. It is also preferably 5% by mass or less, 3% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, or 0.5% by mass or less. By keeping the content within these ranges, it is possible to achieve excellent aesthetics and design with a sense of depth.

[0024] The 50% particle size of the powder containing the ferromagnetic component (B) is preferably 0.01 μm or more, 0.1 μm or more, 0.5 μm or more, or 1 μm or more. It is also preferably 150 μm or less, 100 μm or less, or 60 μm or less. By keeping the particle size within these ranges, when the visible light transmittance of the cured product is 30.0% or more, the orientation of the powder containing the ferromagnetic component can create an aesthetic and design with the greatest sense of depth. If the 50% particle size of the powder containing the ferromagnetic component (B) is outside these ranges, the aesthetic appearance due to the movement and orientation of the powder containing the ferromagnetic component is unlikely to be achieved. Note that the term 50% particle size in this specification refers to the value of the particle size at 50% of the cumulative volume, determined by measuring the particle size distribution using a laser diffraction particle size analyzer.

[0025] [(C) Polymerization initiator] The component (C) polymerization initiator is a compound for initiating the polymerization reaction of a polymerizable compound. The type of component (C) polymerization initiator is not particularly limited, and known polymerization initiators can be used. Examples of the component (C) polymerization initiator include photopolymerization initiators that initiate a polymerization reaction upon irradiation with energy rays such as visible light, ultraviolet light, X-rays, and electron beams; thermal polymerization initiators that initiate a polymerization reaction upon heating to a certain temperature or higher; and chemical polymerization initiators that initiate a polymerization reaction by mixing two or more specific substances. Photopolymerization initiators are preferred. Examples of photopolymerization initiators include radical polymerization initiators that generate radicals upon irradiation with energy rays, cationic polymerization initiators that generate cations, and anionic polymerization initiators that generate anions. Radical polymerization initiators are preferred. Specific examples of radical photopolymerization initiators include, but are not limited to, benzoin ethers, benzil ketals, α-dialkoxyacetophenones, α-hydroxyalkylphenones, α-aminoalkylphenones, acylphosphine oxides, benzophenones, thioxanthones, and titanocenes. Furthermore, two or more of these polymerization initiators can be selected to form an artificial nail composition. Among these, it is preferable to use at least one selected from the group consisting of α-hydroxyalkylphenones and acylphosphine oxides.

[0026] Specific examples of α-hydroxyalkylphenone compounds include 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, α-aminoalkylphenone, etc., and specific examples of acylphosphine oxide compounds include 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,4,6-trimethylbenzoylphenylethoxyphosphine oxide, bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, etc. Among these, it is preferable to use at least one selected from 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,4,6-trimethylbenzoylphenylethoxyphosphine oxide, and bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide.

[0027] Although there are no particular limitations on the content of the polymerization initiator (C), it is preferably 0.1 mass% or more, 1 mass% or more, 2 mass% or more, 3 mass% or more, or 4 mass% or more of the total amount of the composition. It is also preferably 15 mass% or less, 10 mass% or less, 8 mass% or less, 7 mass% or less, or 6 mass% or less. By keeping the content within these ranges, it is possible to improve flexibility, durability, curability, surface hardness, and strength.

[0028] The sense of depth in the present invention refers to a three-dimensional shine caused by the movement and orientation of the powder containing the ferromagnetic component (B), and a shine that gives a sense of distance even within a thin nail art layer. The reason why the artificial nail composition of the present invention can achieve an aesthetic appearance with an excellent sense of depth can be presumed to be due to the following mechanism. Because the cured artificial nail composition of the present invention has a visible light transmittance of 30% or more, light can be perceived not only from the surface of the cured artificial nail composition but also from the inside due to the movement and orientation of the powder containing the ferromagnetic component (B). While conventional magnetic color gels block light from the inside due to the pigment, the artificial nail composition of the present invention allows a relatively greater amount of light to be perceived. Furthermore, light from the cured surface and from the inside of the powder containing the ferromagnetic component (B) interferes with each other and reinforces each other. Additionally, the gloss of the cured surface of the artificial nail composition itself further enhances light interference, making it possible to perceive more light than the amount of light reduced simply by the blocking of the pigment. Furthermore, the presence of a background is one of the elements that contribute to the perception of depth. The human eye senses a stronger sense of three-dimensionality and is more likely to perceive depth when it simultaneously sees both nearby and distant objects (the background). The technique of creating a sense of depth by depicting a background is also known as a way of creating a three-dimensional painting. The artificial nail composition of the present invention has a visible light transmittance of 30% or more, so the color tone of the base can be seen with the naked eye. It is believed that this visible base and the light intensified by the cured product surface described above create a structure that gives a stronger sense of three-dimensionality, with a distant background and nearby light, thereby achieving an even greater sense of depth.

[0029] The unpolymerized rate of the artificial nail composition of the present invention must be 3.0% by weight or less, preferably 1.0% by weight or less, and more preferably 0.5% by weight or less. If the unpolymerized rate exceeds 3.0% by weight, the design created by using a magnet to move and orient the powder containing the ferromagnetic component (B) in the gel may be damaged when the unpolymerized layer is wiped off. The unpolymerized rate in this specification was measured by the following method. The artificial nail composition was applied to a glass plate to a thickness of 0.2 mm, the weight was measured, and then the composition was cured by irradiating it with light for 20 seconds using a commercially available gel nail light (PRESTO LED light, manufactured by Nail Labo Co., Ltd.). The unpolymerized layer on the surface of the artificial nail composition was removed using a wipe soaked in ethanol. The wipe was checked after wiping, and the wipe was repeatedly wiped until the unpolymerized layer no longer adhered to the wipe. After wiping off the unpolymerized layer, the weight was measured again, and the unpolymerized rate was calculated using the following formula (1). Unpolymerized rate (wt%)=(a-b) / a×100 (1) where: a: Weight of the artificial nail composition before hardening b: Weight of artificial nail composition after removing the surface unpolymerized layer

[0030] The visible light transmittance of the artificial nail composition of the present invention must be 30.0% or more, and preferably 40.0% or more, 50.0% or more, 60.0% or more, or 70.0% or more. If the visible light transmittance is less than 30.0%, it may be difficult to express a beautiful appearance and design with a sense of depth. The visible light transmittance in this specification was measured by the following method. The artificial nail composition was sandwiched between transparent glass plates and cured by irradiating it with a commercially available gel nail light (manufactured by Nail Labo, product name: PRESTO LED Light) to prepare a test piece with a thickness of 0.2 mm and a diameter of 18 mm. The artificial nail composition was cured by irradiating it with light for 20 seconds from the top and 20 seconds from the bottom of the two glass plates. The test piece was left standing overnight at room temperature of 23±2°C and a humidity of 50±10%, and then the visible light transmittance was measured using a UV-visible-near-infrared spectrophotometer (manufactured by JASCO Corporation, model: V-750) conforming to JIS R3106.

[0031] The artificial nail composition of the present invention may further contain component (D), a curing accelerator. A polyfunctional thiol compound having two or more thiol groups in one molecule can be used as the curing accelerator. By using a polyfunctional thiol compound, the curing reaction proceeds without being inhibited by oxygen. Specific examples of polyfunctional thiol compounds include 1,2-ethanedithiol, 1,2-propanedithiol, 1,3-propanedithiol, 1,3-butanedithiol, 2,3-butanedithiol, 1,5-pentanedithiol, 1,6-hexanedithiol, 1,8-octanedithiol, 1,9-nonanedithiol, 1,10-decanedithiol, 1,2-benzenedithiol, 1,3-benzenedithiol, 1,4-benzenedithiol, and 3,6-dichlorothiol. -1,2-Benzenedithiol, Toluene-3,4-dithiol, 1,5-Naphthalenedithiol, Ethylene glycol bis(thioglycolate), Ethylene glycol bis(3-mercaptopropionate), 1,4-Butanediol bisthioglycolate, Tetraethylene glycol bis(3-mercaptopropionate), Trimethylolpropane tris(thioglycolate), Trimethylolpropane tris(3-mercaptopropionate), Trimethylolpropane Pantris(3-mercaptobutyrate), tris[(3-mercaptopropionyloxy)-ethyl]isocyanurate, pentaerythritol tetrakis(thioglycolate), pentaerythritol tetrakis(3-mercaptopropionate), dipentaerythritol hexakis(3-mercaptopropionate), 1,4-bis(3-mercaptobutyryloxy)butane, pentaerythritol tetrakis(3-mercaptobutyrate), pentaerythritol tetrakis Trakis(3-mercaptobutyrate), 1,3,5-tris(3-mercaptobutyloxyethyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, dimercaptodiethyl sulfide, 1,8-dimercapto-3,6-dithiaoctane, 1,2-bis[(2-mercaptoethyl)thio]-3-mercaptopropane, tetrakis(7-mercapto-2,5-dithiaheptyl)methane, trithiocyanuric acid, 1,2-benzenedimethane, thiol, 4,4'-Thiobisbenzenethiol, 2-di-n-butylamino-4,6-dimercapto-s-triazine, 2,5-dimercapto-1,3,4-thiadiazole, 1,8-dimercapto-3,6-dioxaoctane, 1,5-dimercapto-3-thiapentane, trimercaptopropionic acid tris(2-hydroxyethyl) isocyanurate, 1,4-dimethylmercaptobenzene, 2,4,6-trimercapto- s-Triazine, 2-(N,N-dibutylamino)-4,6-dimercapto-s-triazine, bis(4-(2-mercaptopropoxy)phenyl)methane, 1,1-bis(4-(2-mercaptopropoxy)phenyl)ethane, 2,2-bis(4-(2-mercaptopropoxy)phenyl)propane, 2,2-bis(4-(2-mercaptopropoxy)phenyl)butane, 1,1-bis(4-(2-mercaptopropoxy)phenyl) 2,2-bis(4-(2-mercaptopropoxy)-3-methylphenyl)propane, 2,2-bis(4-(2-mercaptopropoxy)-5-methylphenyl)propane, bis(2-(2-mercaptopropoxy)-5-methylphenyl)methane, 2,2-bis(4-(2-mercaptopropoxy)-3-t-butylphenyl)propane, tris(4-(2-mercaptopropoxy)phenyl)isobutane Examples of polymerization accelerators include bis(4-(2-mercaptobutoxy)phenyl)methane, 1,1,1-tris(4-(2-mercaptopropoxy)phenyl)ethane, bis(4-(2-mercaptobutoxy)phenyl)methane, 2,2-bis(4-(2-mercaptobutoxy)phenyl)propane, tris(4-(2-mercaptobutoxy)phenyl)methane, 1,3,5-triazine-2,4,6-trithiol, and alkyl vinyl ether adducts thereof. However, the examples are not limited to these. These polymerization accelerators may be used alone or in combination of two or more.

[0032] In addition to polyfunctional thiol compounds, tertiary amines can also be used as the curing accelerator. Specific examples of tertiary amines include N,N-dimethylaniline, N,N-diethylaniline, N,N-di-n-butylaniline, N,N-dibenzylaniline, N,N-dimethyl-p-toluidine, N,N-dimethyl-m-toluidine, N,N-diethyl-p-toluidine, p-bromo-N,N-dimethylaniline, m-chloro-N,N-dimethylaniline, p-dimethylaminobenzaldehyde, p-dimethylaminoacetophenone, p-dimethylaminobenzoic acid, p-dimethylaminobenzoic acid ethyl ester, p-dimethylaminobenzoic acid amino ester, N,N-dimethylanthranilic acid methyl ester, N,N-dihydroxybenzoic acid, N,N-dimethylbenzoic acid methyl ester ... Examples of polymerization accelerators include diethylaniline, N,N-dihydroxyethyl-p-toluidine, p-dimethylaminophenyl alcohol, p-dimethylaminostyrene, N,N-dimethyl-3,5-xylidine, 4-dimethylaminopyridine, N,N-dimethyl-α-naphthylamine, N,N-dimethyl-β-naphthylamine, tributylamine, tripropylamine, triethylamine, N-methyldiethanolamine, N-ethyldiethanolamine, N,N-dimethylhexylamine, N,N-dimethyldodecylamine, N,N-dimethylstearylamine, N,N-dimethylaminoethyl methacrylate, N,N-diethylaminoethyl methacrylate, and 2,2'-(n-butylimino)diethanol. However, these are not limited to these. These polymerization accelerators may be used alone or in combination of two or more.

[0033] When a curing accelerator is included, its content is not particularly limited, but is preferably 4% by mass or more, more preferably 6% by mass or more, even more preferably 10% by mass or more, and particularly preferably 13% by mass or more, based on the total amount of the artificial nail composition. Meanwhile, the upper limit of the content is also not particularly limited, but is preferably 80% by mass or less, more preferably 70% by mass or less, even more preferably 60% by mass or less, and particularly preferably 30% by mass or less. By keeping the content of the polymerization accelerator within the above range, properties such as flexibility, durability, curability, surface hardness, and strength can be improved, and good surface curability can be achieved without polymerization inhibition by oxygen.

[0034] The artificial nail composition of the present invention may further contain a thickener (component (E)). The thickener (component (E)) in the artificial nail composition of the present invention is a substance that inhibits the settling of powder components and separation of liquid components contained in the artificial nail composition, as well as controls the fluidity of the artificial nail composition. Specific examples of thickeners include silica microparticles, alumina microparticles, zirconia microparticles, zeolite, mica, cellulose nanofibers, sugars, and resin particles, and these can be used in combination within a range that does not impair the effects of the present invention. While there are no particular limitations on the amount of thickener, it can be 0.01 to 20.0 wt. % and preferably 0.1 to 10 wt. % of the total amount of the artificial nail composition. If the amount exceeds 20 wt. %, the viscosity of the artificial nail composition may increase, potentially reducing the ease of use of the artificial nail composition. If the amount is less than 0.01 wt. %, solid components in the artificial nail composition may settle or liquid components may separate. Furthermore, these thickeners may be surface-treated or partially modified without any restrictions. The fine particles used as thickeners should have a BET specific surface area of ​​1 to 500 m 2 / g is preferred, and 10 to 410m 2 / g is more preferable, and 100 to 200m 2 By using a material in this range, it is possible to effectively prevent settling and separation while imparting appropriate fluidity.

[0035] [Other ingredients] The artificial nail composition of the present invention may contain components other than the components (A) to (D) described above, provided that the effects of the present invention are not impaired. Examples of other components include adjuvants, additives, colorants, leveling agents, plasticizers, antioxidants, polymerization inhibitors, flocculants, preservatives, waxes, fragrances, UV screening agents, diffusing agents, antifoaming agents, dispersants, fillers, surfactants, pigments, dyes, excipients, ion-releasing agents, antibacterial agents, chain transfer agents, and silane coupling agents, which are commonly used in artificial nail compositions.

[0036] The artificial nail composition of the present invention can be applied to substrates such as, but not limited to, natural nails, nails coated with the artificial nail composition, artificial resin tips, resin films, and resin sheets. Application methods include, but are not limited to, methods using a brush, sponge, spray, inkjet, air knife, and roll.

[0037] Although there are no particular limitations on the viscosity of the artificial nail composition of the present invention, from the viewpoint of ease of handling, it is preferable that the composition has fluidity at 23°C. Specifically, it is preferably 1,000,000 mPa·s or less, 500,000 mPa·s or less, 100,000 mPa·s or less, 50,000 mPa·s or less, 25,000 mPa·s or less, 20,000 mPa·s or less, or 15,000 mPa·s or less. Furthermore, it is preferably 1 mPa·s or more, 10 mPa·s or more, 100 mPa·s or more, 500 mPa·s or more, 1,000 mPa·s or more, 2,000 mPa·s or more, or 3,000 mPa·s or more. By keeping the viscosity within these ranges, it is possible to achieve good flexibility, durability, curability, surface hardness, and strength while maintaining easy handling. The viscosity was measured by placing approximately 30 mL of the artificial nail composition in a 30 mL screw-cap bottle (manufactured by Nichiden Rika Glass Co., Ltd., model SV-30), and measuring the viscosity using a B-type viscometer (manufactured by Toki Sangyo Co., Ltd., model TVB-10M) with a rotor TM4 at a rotation speed of 30 rpm, with the measured value being recorded 2 minutes after the start of the measurement.

[0038] The form of the photocurable artificial nail composition of the present invention is not particularly limited and can be in the form of nail polish, gel nails, acrylic nails, etc. Nail polish is a nail coating also known as nail lacquer, nail enamel, or nail polish, and is a composition that forms a coating film with an excellent aesthetic appearance by drying the contained solvent. Gel nails are materials containing a resin component that cures under ultraviolet or visible light. They are compositions that form an excellent coating film with an excellent aesthetic appearance when applied to natural or artificial nails and then cured by exposure to ultraviolet or visible light. Acrylic nails are powder-liquid materials containing polymer beads and polymerizable monomers. After mixing the powder and liquid, the polymerizable monomers are polymerized by the peroxide contained in the polymer beads, causing the composition to harden. Acrylic nails are characterized by the ability to be applied and built up, and are often used primarily for nail lengthening. Among these, the photocurable artificial nail composition of the present invention is preferably provided in the form of gel nails. By providing them in the form of gel nails, an artificial nail composition that can express a profound aesthetic and design can be provided.

[0039] The gel nail generally comprises a base layer, a color layer, and a top layer laminated in this order on a natural nail or substrate to form a coating film. There are no particular limitations on the method of application of the photocurable artificial nail composition of the present invention, and the composition can be applied as any of the base layer, color layer, and top layer. The artificial nail composition of the present invention is preferably used as the top layer, from the viewpoints that a desired color tone can be used without limitation by selecting the base color layer and that a profound aesthetic and design can be expressed.

[0040] The gel nails include those for hands that are applied to fingernails, those for feet that are applied to toenails, and those for animals that are applied to animal nails. There are no particular limitations on the use of the photocurable artificial nail composition of the present invention, and it can be used for any of hands, feet, animals, etc. [Example]

[0041] Examples and comparative examples of the present invention will be specifically described below, but the present invention is not limited to these examples.

[0042] [Ingredients used in preparing the artificial nail composition] The ingredients used in preparing the artificial nail compositions of the Examples and Comparative Examples are listed below. The weight-average molecular weight (Mw) was measured by gel permeation chromatography (GPC) using a GPC measuring device (Shimadzu Corporation, trade name: Nexera GPC system), a column (Waters Corporation, trade name: Styragel HR), tetrahydrofuran as an eluent, and polystyrene as a standard substance. The 50% particle size was determined by measuring the particle size distribution using a laser diffraction particle size distribution analyzer (Microtrac-Bell, product name: Microtrac MT3300EX II), and the particle size value at 50% of the cumulative volume was used. [Component (A) Polymerizable compound] UA: Urethane diacrylate (number of polymerizable functional groups: 2, weight average molecular weight (Mw): 3000) TMPTA: Trimethylolpropane triacrylate IBMA: Isobornyl methacrylate [Component (B) Powder containing a ferromagnetic component] MAG1: Magnet powder 1 (50% particle size: 11 μm, ferromagnetic components: iron, nickel) MAG2: Magnet powder 2 (50% particle size: 8 μm, ferromagnetic component: nickel) MAG3: Magnet powder 3 (50% particle size: 25 μm, ferromagnetic component: nickel) MAG4: Magnet powder 4 (50% particle size: 54 μm, ferromagnetic component: nickel) MAG5: Magnet Powder 5 (50% particle size: 20 μm, ferromagnetic component: iron) [Component (C) Polymerization initiator] TPOL: 2,4,6-trimethylbenzoylphenylethoxyphosphine oxide [Component (D) Curing accelerator] PETMP: Pentaerythritol tetrakis(3-mercaptopropionate) [Component (E) Thickener] SP: Fine particle silica (BET specific surface area 145 m 2 / g, trimethylsilylated) [Other ingredients] MSD: 2,4-diphenyl-4-methyl-1-pentene TiO2: Titanium oxide V2: Purple 201

[0043] [Preparation of Artificial Nail Composition] Each component was calculated according to the blending ratios shown in Tables 1 to 4, and mixed under atmospheric pressure using a planetary centrifugal mixer (Thinky Corporation, product name: ARV-310P) until a uniform liquid was formed, thereby preparing the photocurable artificial nail compositions of the Examples and Comparative Examples.

[0044] The artificial nail compositions of the Examples and Comparative Examples were evaluated as follows: Unless otherwise specified, the evaluations were carried out at room temperature of 23±2°C, humidity of 50±10%, and under indoor LED lighting.

[0045] [Viscosity measurement] Approximately 30 mL of each of the artificial nail compositions of the Examples and Comparative Examples was placed in a 30 mL screw-cap bottle (manufactured by Nichiden Rika Glass Co., Ltd., model SV-30), and viscosity was measured using a B-type viscometer (manufactured by Toki Sangyo Co., Ltd., model TVB-10M) with a rotor TM4 at a rotation speed of 30 rpm. The viscosity was measured 2 minutes after the start of the measurement.

[0046] [Tensile strength measurement] The artificial nail compositions of the Examples and Comparative Examples were cured by irradiation with light from a commercially available gel nail light (manufactured by Nail Labo, product name: PRESTO LED Light) to prepare dumbbell-shaped test specimens with a thickness of 1.9 mm, a total length of 28.6 mm, a tab-to-tab distance of 25.0 mm, a parallel portion length of 15.0 mm, a shoulder radius of 7.0 mm, and a parallel portion width of 2.0 mm. The test specimens in the mold were irradiated with light for 20 seconds from the top and 20 seconds from the bottom, and then again from the top for 20 seconds after demolding to cure the artificial nail compositions. The prepared test specimens were allowed to stand overnight, and then the tensile strength and breaking strain were measured using an Instron universal testing machine (manufactured by Instron, model: Instron 5943) at a crosshead speed of 10 mm / min.

[0047] [Treatment evaluation] The artificial nail compositions of the Examples and Comparative Examples were evaluated for application by five nail technicians certified by the Japan Nail Technician Association according to the following method.

[0048] [Before use] The condition of the artificial nail compositions of the Examples and Comparative Examples before use was confirmed visually and by sampling with a brush, and the evaluation results were compiled according to the following criteria and comprehensively evaluated. 1: Separation of liquid components and settling of powder components were observed, making it impossible to obtain a uniform composition. 2: No separation of liquid components or settling of powder components was observed, and a uniform composition was obtained.

[0049] [Design sustainability] The artificial nail compositions of Examples and Comparative Examples were applied to the nails or nail tips of the recipient, and a magnetic powder design was created using a commercially available magnet (manufactured by Nail Labo, product name: ageha cylindrical mini magnet), and then the composition was cured by irradiating it with light for 20 seconds using a commercially available gel nail light (manufactured by Nail Labo, product name: PRESTO LED light), and the unpolymerized layer on the surface was wiped off with a wipe soaked in ethanol. At this time, the state of the designed magnetic powder was visually confirmed, and an overall evaluation was made based on the evaluation results according to the following criteria. 1: Part of the magnetic powder was wiped off along with the unpolymerized surface layer, and the pre-hardening design could not be maintained. 2: The design before hardening was maintained.

[0050] [Depth] The artificial nail compositions of the Examples and Comparative Examples were applied to the nails or nail tips of the recipients, and a magnetic powder design was created using a commercially available magnet (manufactured by Nail Labo, product name: ageha cylindrical mini magnet). The compositions were then cured by irradiating them with light for 20 seconds using a commercially available gel nail light (manufactured by Nail Labo, product name: PRESTO LED light). The sense of depth of the cured artificial nail composition design was visually confirmed, and an overall evaluation was made based on the evaluation results according to the following criteria. The artificial nail composition of Comparative Example 3 was evaluated after wiping off the unpolymerized surface layer with an ethanol-soaked wipe. 0: Part of the magnetic powder was wiped off along with the unpolymerized surface layer, the original design could not be maintained, and evaluation was not possible. 1: The pigment-derived color was strong, and the aesthetic appeal unique to magnetic powder was lacking. 2: Although the aesthetic appeal unique to conventional magnetic powder was expressed, it remained a flat expression. 3: The unique aesthetic of magnetic powder was enhanced with a sense of depth, creating a three-dimensional aesthetic. 4: The unique aesthetic of magnetic powder was enhanced with a strong sense of depth, emphasizing the three-dimensional aesthetic. 5: The unique aesthetic appearance of magnetic powder was enhanced with a very strong sense of depth, resulting in a particularly outstanding three-dimensional aesthetic.

[0051] [Compatibility with base color 1] A commercially available gel nail (Nail Labo, product name: PRESTO Mixing Gel) was applied to the nail or nail tip of the patient and cured by 20 seconds of light irradiation with a commercially available gel nail light (Nail Labo, product name: PRESTO LED Light). The artificial nail compositions of the Examples and Comparative Examples were then applied, and a magnetic powder design was created using a commercially available magnet (Nail Labo, product name: ageha Cylindrical Mini Magnet), followed by similar curing with the light. The appearance of the cured artificial nail compositions was visually inspected, and the results were evaluated based on the following criteria. The artificial nail composition of Comparative Example 3 was evaluated after wiping off the unpolymerized surface layer with an ethanol-soaked wipe. The pigment-containing compositions of Comparative Examples 1 and 2 were excluded from evaluation because they were less affected by the color tone of the base. 0: Part of the magnetic powder was wiped off along with the unpolymerized surface layer, the original design could not be maintained, and evaluation was not possible. 1: Dark areas were found here and there. 2: Depending on the design, dark areas may appear in some places. 3: It created a beautiful, three-dimensional image with a sense of depth without feeling dark.

[0052] [Compatibility with base color 2] The evaluation was carried out in the same manner as in Compatibility with the base color 1, except that the commercially available gel nail to be applied to the surgeon's nails or nail tips was PRESTO Color Gel 061 manufactured by Nail Labo Co., Ltd. 0: Part of the magnetic powder was wiped off along with the unpolymerized surface layer, the original design could not be maintained, and evaluation was not possible. 1: Dark areas were found here and there. 2: Depending on the design, dark areas may appear in some places. 3: It created a beautiful, three-dimensional image with a sense of depth without feeling dark.

[0053] [Compatibility with base color 3] The evaluation was carried out in the same manner as in Compatibility with the base color 1, except that the commercially available gel nail to be applied to the surgeon's nails or nail tips was PRESTO Color Gel 060 manufactured by Nail Labo Co., Ltd. 0: Part of the magnetic powder was wiped off along with the unpolymerized surface layer, the original design could not be maintained, and evaluation was not possible. 1: Dark areas were found here and there. 2: Depending on the design, dark areas may appear in some places. 3: It created a beautiful, three-dimensional image with a sense of depth without feeling dark.

[0054] The evaluation results of the examples and comparative examples are shown below.

[0055] [Table 1]

[0056] [Table 2]

[0057] [Table 3]

[0058] [Table 4] [Industrial Applicability]

[0059] According to the present invention, it is possible to provide an artificial nail composition that can express a profound aesthetic and design.

Claims

1. Component (A) Polymerizable compound Component (B) Powder containing a ferromagnetic component Component (C) Polymerization initiator The artificial nail composition contains the above-mentioned compound, and when polymerized and cured in the atmosphere, the surface unpolymerization rate is 3.0% by weight or less, and the cured product has a visible light transmittance of 30.0% or more.

2. 2. The artificial nail composition according to claim 1, wherein the polymerizable compound (A) is at least one selected from the group consisting of a compound having a urethane bond in the molecule and a polymerizable monomer having an ethylenically unsaturated group.

3. 2. The artificial nail composition according to claim 1, wherein the powder containing the ferromagnetic component (B) is a powder containing at least one selected from the group consisting of iron, nickel, cobalt, and gadolinium.

4. 2. The artificial nail composition according to claim 1, wherein the 50% particle size of the powder containing the ferromagnetic component (B) is 0.1 to 150 μm.

5. 2. The artificial nail composition according to claim 1, wherein the component (C) polymerization initiator is a photopolymerization initiator.

6. 2. The artificial nail composition according to claim 1, wherein the component (C) polymerization initiator is at least one selected from the group consisting of acylphosphine oxides and hydroxyalkylphenones.

7. 2. The artificial nail composition according to claim 1, wherein the surface unpolymerized rate when polymerized and cured in the atmosphere is 1.0% by weight or less.

8. 2. The artificial nail composition according to claim 1, wherein the cured product has a visible light transmittance of 50.0% or more.

9. Component (A) polymerizable compound 20.0 to 95.0% by mass, Component (B) 0.01 to 5.0 mass% of a powder containing a component having ferromagnetic properties; Component (C) Polymerization initiator 0.1 to 10.0 mass% 10. The artificial nail composition of claim 1, comprising:

10. 2. The artificial nail composition according to claim 1, further comprising component (D) a curing accelerator.

11. 11. The artificial nail composition according to claim 10, wherein the curing accelerator (D) is at least one selected from the group consisting of thiol compounds and tertiary amines.

12. 11. The artificial nail composition according to claim 10, wherein the content of the component (D) curing accelerator is within the range of 1.0 to 50.0% by mass based on the total amount of the artificial nail composition.

13. 10. The artificial nail composition of claim 1, further comprising component (E) a thickener.

14. 14. The artificial nail composition according to claim 13, wherein the thickener (E) is at least one selected from the group consisting of silica, alumina, cellulose derivatives, sugars, and resins.

15. 14. The artificial nail composition according to claim 13, wherein the content of the thickener (E) is within the range of 0.1 to 20.0% by mass based on the total mass of the composition.

16. An artificial nail obtained from the artificial nail composition according to claim 1.

17. A method for producing an artificial nail, comprising the steps of applying the artificial nail composition according to claim 1 onto a nail or a substrate and curing the composition.

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