Composition for correcting inwardly turning nails

Abstract

The present invention relates to a composition for correcting ingrown nails, comprising a siloxane resin, an acrylate compound, and a photoinitiator. The composition of the present invention can provide an effect of correcting ingrown nails by generating a reverse curl in the opposite direction to the direction in which the ingrown nail is bent, in a simple method of applying the composition to the ingrown nail and curing it. In addition, the present invention can provide a composition that has an excellent effect of correcting ingrown nails and is easy to use, by maximizing the amount of curl through optimal formulation of the composition, preventing the cured material from falling off the surface of the nail, preventing the appearance of residue after curing, and controlling the heat sensation due to reaction heat to be not too high.

Description

Technical Field

[0001] The present invention relates to a composition for correcting ingrown nails. More specifically, when applied to an ingrown nail and cured, the composition can correct an ingrown fingernail or toenail by inducing a reverse curl in the direction opposite to the direction in which the ingrown nail is warped.

Background Art

[0002] An ingrown (toe) nail is a disease in which a fingernail or toenail penetrates the skin, causing inflammation and pain. Ingrown nails can occur due to various causes, such as when the natural curvature of the nail becomes severe due to obesity or aging, when athlete's foot is left untreated for a long time and the shape of the nail is deformed, or when tight shoes are worn for a long time and the nail continuously presses on the skin outside the nail.

[0003] Such a disease of ingrown nails often occurs in toenails, especially toenails of the big toe. However, since ingrown toenails are considerably thicker than normal toenails, the toenails dig into the skin with a stronger force, resulting in more severe inflammation and pain. When the inflammation worsens, there may be an odor and the pain may become even more severe, causing serious inconvenience in life, such as difficulty walking and the symptoms worsening when wearing shoes.

[0004] As a correction device for treating such a disease of ingrown nails, Korean Registered Patent Publication No. 10-1565692 discloses a corrector that correctly corrects an ingrown toenail to a normal toenail by attaching an elastic leaf spring to the toenail. However, when such a corrector is attached to the toenail, the user may feel inconvenient during daily life or walking due to the feeling of wearing it, and it may be difficult to wear shoes while sandwiching the corrector depending on the size of the device, so continuous correction may be difficult when going out.

[0005] To address the inconvenience of such corrective devices, a technique has been proposed to correct inwardly curved toenails by applying a coating agent to the nails. For example, Korean Patent Publication No. 10-2021734 discloses a technique that demonstrates the corrective effect of inwardly curved toenails by coating the toenails with a coating agent containing nitrocellulose, acrylic resin, dibutyl phthalate, butyl acetate, valproic acid, and caffeic acid ester.

[0006] However, a drawback of using the aforementioned coating agent to correct inwardly curved toenails was that the surface of the toenail had to be polished. Furthermore, the aforementioned technique uses the coating agent to soften the surface of the toenail and give it flexibility, playing only an incidental role in the correction process and not directly related to the corrective effect, and thus having the limitation that it takes time for the effect to appear.

[0007] Therefore, there is a need to develop a technique for correcting inwardly turned nails that can achieve excellent corrective effects without the use of orthodontic devices that cause inconvenience to the user. [Overview of the project] [Problems that the invention aims to solve]

[0008] The object of the present invention is to provide a composition that can correct inwardly curved nails by inducing a reverse curl in the opposite direction to the direction in which the nail is curved. [Means for solving the problem]

[0009] To achieve the above objective, the present invention provides a composition for correcting inwardly growing nails, comprising a siloxane resin including an epoxysiloxane resin, an acrylate compound, and a photoinitiator.

[0010] In the present invention, the composition may contain 1 to 50% by weight of a siloxane resin, 10 to 50% by weight of an acrylate compound, 0.1 to 15% by weight of a photoinitiator, and the remainder of a solvent, based on the total weight of the composition.

[0011] In the present invention, the siloxane resin may further include a siloxane resin that does not have epoxy groups.

[0012] In the present invention, the acrylate compound may include at least one selected from the group consisting of urethane acrylate, epoxy acrylate, silicone-modified acrylate, and polyester acrylate.

[0013] In the present invention, the acrylate compound may be a polyfunctional acrylate compound having three or more acrylate functional groups.

[0014] In the present invention, the weight ratio of the siloxane resin to the acrylate compound may be 1:1 to 3:1.

[0015] In the present invention, the photoinitiator may include a cationic initiator and a radical initiator.

[0016] In the present invention, the radical initiator may include a short-wavelength radical initiator having a maximum absorption peak at 300 nm or less.

[0017] In the present invention, the weight ratio of the cationic initiator to the radical initiator may be 1:2 to 1:50.

[0018] The composition of the present invention may further contain a polythiol.

[0019] The composition of the present invention may further contain one or more additives selected from ultraviolet absorbers, leveling agents, and polymerization inhibitors. [Effects of the Invention]

[0020] The composition for correcting ingrown nails according to the present invention can correct ingrown nails by generating a reverse curl in the direction opposite to the direction in which the ingrown nails are warped through a simple method of application and curing. Thereby, a continuous correction effect can be provided by a simple method without a separate correction device or surgery.

[0021] In particular, in the present invention, by optimizing the composition of the composition, it is possible to maximize the amount of curl while preventing the cured product from falling off the surface of the nail, so that no residue appears after curing, and the heat sensation due to the heat of reaction is not increased. It is possible to provide a composition excellent in the correction effect and usability of ingrown nails.

Brief Description of the Drawings

[0022] [Figure 1] FIG. 1 shows the results of a correction test of a composition for correcting ingrown nails according to an embodiment of the present invention. [Figure 2] FIG. 2 shows the results of a correction test of a composition for correcting ingrown nails according to an embodiment of the present invention.

Modes for Carrying Out the Invention

[0023] Hereinafter, specific embodiments of the present invention will be described in more detail. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In general, the nomenclature used herein is well known and commonly used in the art.

[0024] The present invention relates to a composition for correcting ingrown nails, which can exhibit a correction effect by applying it to the surface of an ingrown nail and curing it.

[0025] According to the present invention, when the composition for correcting ingrown toenails is applied to the surface of the toenail to be corrected and irradiated with ultraviolet light, the composition can exhibit the effect of correcting the ingrown toenail while curing and generating a reverse curl. In the present invention, the term "reverse curl" means a curl that occurs in the direction opposite to the direction in which the ingrown toenail is bent, and conversely, the term "positive curl" means a curl that occurs in the direction in which the ingrown toenail is bent.

[0026] When the composition of the present invention is used, it is possible to correct ingrown toenails without a separate correction device, so that the correction effect can be continuously maintained regardless of whether shoes are worn or not, without causing inconvenience to the user. Further, in the prior art, when a coating composition is used for correcting ingrown toenails, it only has the effect of simply protecting the toenails and imparting flexibility, and it is difficult to exhibit a substantial physical correction effect. However, when the present invention is used, a correction effect by physical force can be exhibited only by applying the composition to the toenail and irradiating it with ultraviolet light.

[0027] When a generally used photocurable composition is applied to the surface of an ingrown toenail, a positive curl may occur due to the shrinkage phenomenon during curing, and the symptoms of the ingrown toenail may be further aggravated. However, in the present invention, by adjusting the components and formulation of the photocurable composition, a composition that is excellent in both curability and adhesion while generating a reverse curl can be provided, which can be effectively used for correcting ingrown toenails.

[0028] In order to achieve such an effect, the composition for correcting ingrown toenails of the present invention is characterized by containing a siloxane resin, an acrylate compound, and a photoinitiator.

[0029] The siloxane resin is a photocurable resin and means a polysiloxane compound containing a siloxane functional group composed of Si - O bonds in the molecule. In the present invention, the siloxane resin is used as a component for inducing a reverse curl during curing.

[0030] Specifically, when a composition containing siloxane resin is applied to an inwardly curved nail according to the present invention and cured, the composition can harden while curving in the opposite direction to the curvature of the inwardly curved nail. Therefore, simply by applying and curing the composition, a force is applied in the opposite direction to the inwardly curved nail, inducing a corrective effect.

[0031] In the present invention, the siloxane resin may include a polysiloxane resin containing one or more epoxy groups, i.e., an epoxysiloxane resin. When an epoxysiloxane resin is used, the amount of reverse curl is improved and the cured product can have high hardness, thus demonstrating an excellent effect in correcting inward-curling nails.

[0032] In the present invention, the epoxysiloxane resin may contain epoxy groups at the ends of the polysiloxane, and can be represented, for example, by the following chemical formula (1).

[0033] [ka]

[0034] In the above formula, R may independently be hydrogen, a C1-C6 alkyl group, or a C1-C6 alkoxy group. R' may independently be hydrogen, a hydroxyl group, a C1-C6 alkyl group, or a C1-C6 alkoxy group. X may independently be an epoxy group, a C1-C6 epoxyalkoxy group, or a C1-C6 epoxycycloalkyl group. n can be an integer from 1 to 6. m + m' can be between 10 and 1,000.

[0035] For example, the epoxysiloxane resin can be produced by a condensation reaction between a polysiloxane containing an alkyl group and a silane compound containing an epoxy group.

[0036] In one embodiment of the present invention, the siloxane resin can be a mixture of the epoxysiloxane resin and a siloxane resin without epoxy groups. If only epoxysiloxane resin is used as the siloxane resin, problems such as heat sensation when irradiated with a nail UV lamp and uneven curling may occur. However, in the present invention, these problems can be solved by mixing the epoxysiloxane resin with a siloxane resin without epoxy groups.

[0037] In the present invention, the siloxane resin without epoxy groups is represented by the following chemical formula (2).

[0038] [ka]

[0039] In the above formula, R may independently be hydrogen, a C1-C6 alkyl group, or a C1-C6 alkoxy group. R' may independently be hydrogen, a hydroxyl group, a C1-C6 alkyl group, or a C1-C6 alkoxy group. m + m' can be between 10 and 1,000.

[0040] In the present invention, the siloxane resin that does not have epoxy groups may be a siloxane resin that contains Si-H bonds within the repeating units of polysiloxane, i.e., a hydrosiloxane resin.

[0041] The hydrosiloxane resin may be a polysiloxane containing an alkylhydrosiloxane repeating unit in the molecule, such as an alkylhydrosiloxane-dialkylsiloxane copolymer or alkylhydrosiloxane, and may be, for example, a compound in which one or more R in the above chemical formula (2) are hydrogen.

[0042] In the present invention, the epoxysiloxane resin and the siloxane resin without epoxy groups can be mixed in a ratio of 1:2 to 1:10 by weight, preferably 1:3 to 1:8. When the siloxane resin content is adjusted to the above range, it is possible to adjust the curl amount to be high while uniform reverse curl occurs on the bending surface of the inward-facing nail, without generating uncured residue, and without causing a feeling of heat during curing.

[0043] In the present invention, the total amount of the siloxane resin may be 1 to 50% by weight, preferably 10 to 50% by weight, and more preferably 20 to 40% by weight, based on the total weight of the composition.

[0044] The acrylate-based compounds contained in the inward-facing nail correction composition of the present invention are polymerizable compounds used together with siloxane resins. In the present invention, the term "acrylate" includes not only acrylate but also methacrylate, and "acrylate-based compounds" includes acrylate-based polymers, oligomers, and monomers.

[0045] The acrylate compound is one of the following: urethane acrylate, epoxy acrylate, silicone-modified acrylate, polyester acrylate, etc., and is preferably a urethane acrylate compound.

[0046] The urethane acrylate may be produced by reacting an acrylate compound having a hydroxyl group in its molecule with a compound having an isocyanate group. For example, the urethane acrylate may be a polyfunctional urethane acrylate, which can be produced by reacting a hydroxyacrylate compound containing three or more polymerizable unsaturated functional groups in its molecule with a bifunctional aliphatic isocyanate compound.

[0047] The aforementioned bifunctional aliphatic isocyanate compounds include hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, isophorone diisocyanate, 1,4-diisocyanatobutane, 1,6-diisocyanatohexane, 1,8-diisocyanatooctane, 1,12-diisocyanatododecane, 1,5-diisocyanato-2-methylpentane, trimethyl-1,6-diisocyanatohexane, 1,3-bis(isocyanatomethyl)cyclohexane, trans-1,4-cyclohexane diisocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, and xylene-1,4-diisocyanate. These may include tetramethylxylene-1,3-diisocyanate, 1-chloromethyl-2,4-diisocyanate, 4,4'-methylenebis(2,6-dimethylphenyl isocyanate), 4,4'-oxybis(phenyl isocyanate), etc.

[0048] The hydroxyacrylate compound containing three or more polymerizable unsaturated functional groups in its molecule may be pentaerythritol triacrylate, dipentaerythritol triacrylate, pentaerythritol tri / tetra(meth)acrylate, dipentaerythritol penta / hexa(meth)acrylate, and the like.

[0049] In the present invention, the acrylate compound may be a polyfunctional acrylate compound having three or more acrylate groups. In this case, the number of functional groups is preferably 5 to 20, and more preferably 8 to 18.

[0050] In the present invention, if the number of functional groups in the acrylate compound is small, a positive curl is induced instead of a reverse curl, which may reduce the total amount of curl and decrease the rate at which the amount of curl changes. As a result, the corrective effect on inward-growing nails may be minimal, or the positive curl may even worsen the inward-growing nails. However, as the number of functional groups in the acrylate compound increases to 3 or more, preferably 5 or more, and more preferably 8 or more, the rate of curl generation and the amount of curl increase, and it can show an excellent effect in correcting inward-growing nails.

[0051] In the present invention, the content of the acrylate compound may be 10 to 50% by weight, preferably 15 to 35% by weight, based on the total weight of the composition.

[0052] In the present invention, the weight ratio of the siloxane resin to the acrylate compound is 1:1 to 3:1, preferably 1:1 to 2:1. Within this range, the composition of the present invention exhibits reverse curl as it hardens, increasing the amount of curl and improving the corrective effect on inwardly curved nails. Furthermore, it exhibits excellent hardness without leaving any residue after hardening, even when cured with a UV lamp for nails.

[0053] The photoinitiator contained in the inward-growing nail correction composition of the present invention is a component that polymerizes the resin and polymerizable compound upon light irradiation. The photoinitiator may be present in an amount of 0.1 to 15% by weight, preferably 2 to 10% by weight, relative to the total weight of the composition.

[0054] In the present invention, a cationic initiator or a radical initiator can be used as the photoinitiator, and preferably a mixture of a cationic initiator and a radical initiator can be used.

[0055] In the present invention, the cationic initiator is an initiator that initiates polymerization by forming cations upon light irradiation, and in the present invention, the cationic initiator is used as a component for inducing reverse curl.

[0056] In the present invention, an onium salt can be used as the cationic initiator. Specifically, the onium salt initiator can mean an iodonium salt, a sulfonium salt, etc., and may include, for example, at least one selected from the group consisting of sulfonium hexafluorophosphate, diphenyl(4-phenylthio)phenylsulfonium hexafluorophosphate, (phenyl)[4-(2-methylpropyl)phenyl]-iodonium hexafluorophosphate, (thiodi-4,1-phenylene)bis(diphenylsulfonium)dihexafluoroantimonate, and (thiodi-4,1-phenylene)bis(diphenylsulfonium)dihexafluorophosphate.

[0057] In addition, organometallic salts such as iron-arene complexes; organosilanes such as o-nitrile benzyltriarylsilyl ether, triarylsilyl peroxide, and acylsilane; and latent sulfonic acids such as α-sulfonyloxyketone and α-hydroxymethylbenzoin sulfonate can also be used as cationic initiators.

[0058] The content of the cationic initiator may be 0.05 to 5% by weight, preferably 0.1 to 3% by weight, relative to the total weight of the composition. Within this range, the reverse curl phenomenon due to the cationic initiator can be observed while minimizing the yellowing phenomenon during curing.

[0059] In the present invention, the radical initiator is an initiator that forms radicals upon light irradiation to initiate polymerization, and in the present invention, the radical initiator is used to regulate the curing of the composition while preventing shrinkage.

[0060] Radical initiators are classified into short-wavelength initiators and long-wavelength initiators according to their absorption wavelength range, and in the present invention, the radical initiator is preferably a short-wavelength initiator. In the present invention, the term "short-wavelength initiator" can mean an initiator that exhibits a maximum absorption peak at a wavelength of 300 nm or less, preferably 250 nm or less.

[0061] When a long-wavelength initiator is used as a radical initiator, the composition may shrink and curl in the direction of nail bending when it hardens, which can reduce the corrective effect on inwardly curved nails and potentially worsen the condition. In this invention, by using a short-wavelength initiator as a radical initiator, it is possible to adjust the composition so that a reverse curl appears without shrinkage during hardening.

[0062] Examples of radical initiators used in the present invention include 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-phenone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, cyclohexylphenyl ketone, benzophenone, 1-(4-isopropylphenyl)-2-hydroxy-2-methyl-1-one, 1-[4-(2-hydroxyethoxy)phenyl]-2-hydroxy-2-methylpropan-1-one, and α,α-diethoxyacetophenone.

[0063] The content of the radical initiator may be 0.05 to 10% by weight, preferably 2 to 8% by weight, relative to the total weight of the composition. Furthermore, when the cationic initiator and radical initiator are used in combination, the weight ratio may be 1:2 to 1:50, preferably 1:10 to 1:30. Within this range, it is possible to induce reverse curl and exhibit an excellent corrective effect for inwardly curled nails while minimizing yellowing and ensuring that no uncured residue remains on the surface.

[0064] In one embodiment of the present invention, the composition for correcting inwardly turned nails may further contain polythiol.

[0065] In the present invention, the polythiol is an ingredient that promotes surface hardening while maintaining the reverse curl caused by the ingredients of the present invention, thereby improving the corrective effect of inwardly curved nails.

[0066] The aforementioned polythiols are pentaerythritol tetrakis(3-mercaptopropionate), 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithia. It may contain at least one selected from the group consisting of aundecane, 1,1,3,3-tetrakis(mercaptomethylthio)propane, 4,6-bis(mercaptomethylthio)-1,3-dithiane, 2-(2,2-bis(mercaptomethylthio)ethyl)-1,3-dithiaethane, 1,1,2,2-tetrakis(mercaptomethylthio)ethane, and 3-mercaptomethyl-1,5-dimercapto-2,4-dithiapentane.

[0067] In the present invention, the polythiol content may be 2 to 10% by weight, preferably 5 to 8% by weight, relative to the total weight of the composition. Within this range, the cured product can exhibit excellent hardness while maintaining the reverse curl induction effect.

[0068] The present invention's composition for correcting inwardly growing nails may further contain an ultraviolet (UV) absorber.

[0069] In the present invention, the ultraviolet absorber is present in an amount of 0.05 to 3% by weight of the total weight of the composition, and can regulate the rate at which reverse curl occurs during curing, thereby preventing the cured material from falling off the surface of the nail.

[0070] The ultraviolet absorber can be at least one selected from the group consisting of benzoxazinone-based, triazine-based, benzotriazole-based, and benzophenone-based ultraviolet absorbers. Examples of commercially available UV absorbers include: benzoxazinone-based products such as Cytech's CYASORB UV-3853S; triazine-based products such as Cytech's CYASORB UV-1164, and BASF's TINUVIN 1577, TINUVIN P, TINUVIN 234, TINUVIN 326, TINUVIN 328, TINUVIN 329, TINUVIN 571, TINUVIN 400, and TINUVIN 479; and benzotriazole-based products such as Shiba's CYASORB UV-2337 and CYASORB UV-5411, and BASF's TINUVIN 360, TINUVIN 213, TINUVIN 99-2, TINUVIN 171, TINUVIN 328, TINUVIN 384-2, TINUVIN 900, and TINUVIN 928. Examples of UV absorbers include 1130, Songwon Industrial's SONGSORB 1000, SONGSORB 2340, SONGSORB 3200, SONGSORB 3260, SONGSORB 3270, and SONGSORB 3280; benzophenone-based UV absorbers include Cytech's CYASORB UV-9, CYASORB UV-24, and CYASORB UV-531; Shiba's CHIMASSORB 81; and Songwon Industrial's SONGSORB 8100. Each UV absorber can be used individually or in combination of two or more.

[0071] The present invention's composition for correcting inwardly growing nails may further contain a leveling agent to prevent surface cratering. The leveling agent may be included in an amount of 0.1 to 1% by weight of the total composition, taking into consideration coating properties and curability.

[0072] In the present invention, the leveling agent may be a silicone-based, fluorine-based, acrylic-based, or other type of formulation. Examples of commercially available leveling agents include BYK-323, BYK-331, BYK-333, BYK-337, BYK-373, BYK-375, BYK-377, and BYK-378 from BYK-Chemie; TEGO Glide 410, TEGO Glide 411, TEGO Glide 415, TEGO Glide 420, TEGO Glide 432, TEGO Glide 435, TEGO Glide 440, TEGO Glide 450, TEGO Glide 455, TEGO Rad 2100, TEGO Rad 2200N, TEGO Rad 2250, TEGO Rad 2300, and TEGO Rad 2500 from EVONIK; and FC-4430 and FC-4432 from 3M.

[0073] The present invention's composition for correcting inwardly growing nails may further contain 0.1 to 1% by weight of a polymerization inhibitor based on the total weight of the composition.

[0074] In the present invention, the polymerization inhibitors include phenol compounds such as hydroquinone, hydroquinone monomethyl ether, hydroquinone monoethyl ether, p-methoxyphenol, and pt-butylcatechol; hydroxylamine compounds such as N,N-diethylhydroxylamine and N-nitrosophenylhydroxylamine ammonium salt (Cuferon); and organic sulfur compounds such as dithiobenzoyl disulfide and tetraethyl thiuram disulfide. Each polymerization inhibitor can be used alone or in combination of two or more.

[0075] The present invention's composition for correcting inwardly curved nails can be used in combination with a solvent.

[0076] As the solvent, an organic solvent commonly used as a solvent for coating compositions can be used. For example, one or more solvents such as methanol, ethanol, isopropanol, butanol, methyl cellosolve, ethyl cellosolve, methyl ethyl ketone, methyl butyl ketone, methyl isobutyl ketone, diethyl ketone, dipropyl ketone, cyclohexanone, hexane, heptane, octane, benzene, toluene, xylene, methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, and methoxymethyl ethyl acetate can be used as the organic solvent.

[0077] The present invention's composition for correcting inwardly growing nails may further contain, in addition to the above-mentioned components, components commonly added to photocurable compositions, such as ultraviolet stabilizers, antioxidants, wetting agents, and defoaming agents.

[0078] According to the present invention, the inward-curving nail can be corrected by applying the inward-curving nail correction composition to the nail to be corrected and drying it with a UV lamp to form a coating layer. At this time, the corrective effect can be adjusted by forming the coating layer one or more times, preferably two to four times, and it is possible to control the occurrence of a natural reverse curl without the coating layer falling off. Furthermore, after applying a top coat on the uppermost coating layer, the curing can be completed by finally irradiating it with ultraviolet light.

[0079] The coating thickness of the composition may be 1 to 500 μm per application, preferably 10 to 200 μm, and UV drying can be performed for 10 seconds or more per application, preferably 10 seconds to 1 minute.

[0080] There are no particular restrictions on the specifications of the UV lamp used for drying (curing) the composition. For example, a UV lamp commonly used in nail salons that emits wavelengths in the range of 300 to 450 nm and has a power of 50 to 100 W can be used.

[0081] When the inward-curving nail correction composition of the present invention is applied to a nail and irradiated with light, the composition hardens and bends in the opposite direction to the nail's curvature. This creates the effect of applying a physical force in the opposite direction to the curvature to both ends of the inward-curving nail, thereby correcting the inward-curving nail.

[0082] According to the present invention, inward-growing nails can be easily corrected simply by applying and curing a coating agent, without the need for surgical procedures or corrective devices. Furthermore, the present invention allows for the sustained corrective effect without causing inconvenience in daily life. Moreover, the present invention improves the corrective effect by maximizing the amount of curl while generating a reverse curl through the optimal formulation of the composition, preventing problems such as shrinkage during curing and detachment from the adherend, and adjusting the composition to cure easily. Therefore, the present invention can provide a simple and convenient method for correcting inward-growing nails that exhibits excellent corrective effects.

[0083] <Examples> The present invention will be described in more detail through the following examples. However, these examples illustrate some experimental methods and configurations to illustrate the present invention, and the scope of the present invention is not limited to these examples.

[0084] <Manufacturing Example: Manufacturing of a composition for correcting inwardly turning nails> Compositions for correcting inwardly growing nails were prepared according to the compositions listed in Table 1 below (unit: weight %).

[0085] [Table 1]

[0086] The ingredients used in Table 1 are explained below. - Epoxysiloxane: Epoxypropoxypropyldimethoxysilylpolydimethylsiloxane (Company C) - Siloxane without epoxy group: Methylhydrosiloxane (Company G) - 15-functional urethane acrylate: POLYGOMER PN-3915 (P Company) - Hexafunctional urethane acrylate: POLYGOMER PN-3640 (P Company) - Polythiol: Tetrafunctional polythiol (Company S) - Cationic initiator: Sulfonium hexafluorophosphate (Omnicat 270, Company I) - Short-wavelength radical initiator: 1-hydroxycyclohexylphenyl ketone (Omnirad 184, Company I) - Long-wavelength radical initiator: 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (Omnirad TPO, Company I) - UV absorber: Hydroxyphenyltriazine (Tinuvin 400, Company B) Leveling agent: Silicone-free acrylic leveling agent (TEGO Flow 460 N, E Company) - Polymerization inhibitor: Hydroquinone monomethyl ether (MEHQ) - PGMA: 2-Methoxy-1-methylethylacetate - MIBK: Methyl isobutyl ketone

[0087] <Comparative Example: Production of a photocurable composition containing siloxane resin> To compare the properties of conventional photocurable compositions used for display coatings with the composition of the present invention, a photocurable composition for displays containing an epoxysiloxane resin was prepared as a comparative example.

[0088] Specifically, a photocurable composition was prepared having the following composition: 10.3% by weight of epoxysiloxane resin, 58.6% by weight of urethane acrylate (dipentaerythritol hexaacrylate), 1.4% by weight of (4-methylphenyl)[4-(2-methylpropyl)phenyl]iodonium hexafluorophosphate (cationic initiator), 2.1% by weight of 1-hydroxycyclohexylphenyl ketone (radical initiator), 3.4% by weight of methyl-5-norvonene-2,3-dicarboxyl anhydride (curing agent), and 24.1% by weight of methyl ethyl ketone (solvent).

[0089] <Experimental Example 1: Measurement of curl amount and confirmation of degree of hardening after curing> The inward-curving nail correction composition produced in the above manufacturing example was applied to an artificial nail tip with a thickness of 0.5T to a thickness of 20μm, dried for 30 seconds under a UV LED nail lamp, and then the application and drying process was repeated under the same conditions. As the UV LED nail lamp, a lamp with a wavelength in the 365 to 405nm range and a power of 70W was used, according to the specifications of lamps commonly used in nail shops.

[0090] The degree to which the nail tips expanded after one application and drying, and after a second application and drying, as well as after 24 hours of storage at room temperature, were measured and are shown in Table 2 below (unit: mm). In this case, the amount of reverse curl is expressed as a positive number, and the amount of positive curl is expressed as a negative number.

[0091] Furthermore, the residue on the surface after hardening was checked, and a circle (○) was indicated if there was no unhardened residue on the surface or if the amount was small, while a cross (×) was indicated if a large amount of residue was observed. These results are shown in Table 2.

[0092] [Table 2]

[0093] According to the results in Table 2, when the composition of Manufacturing Example 1 was applied to a nail tip, a reverse curl occurred, and it was confirmed that the curl amount was high at 1.2 mm after 24 hours, and that curing was completed without any residue.

[0094] On the other hand, reverse curl also occurred in manufacturing example 2, with a curl of 1.0 mm appearing after 24 hours, and curing was completed without any residue. However, in manufacturing example 2, because it did not contain a UV absorber, the amount of curl was slightly less than in manufacturing example 1, and a feeling of heat was generated when applied to the surface of the toenail.

[0095] In Production Example 3, an acrylate compound with the same viscosity as the compound used in Production Example 1 but with fewer functional groups was used. The experimental results showed that the curl amount after 24 hours decreased to 0.6 mm, which is half the level of Production Example 1. This confirmed that the higher the number of functional groups in the acrylate compound, the faster the nail tip spreads and the amount of curl increases.

[0096] The compositions of Production Example 4, which used a long-wavelength initiator as a radical initiator, and Production Example 5, which used only a radical initiator without a cationic initiator as a photoinitiator, exhibited shrinkage during curing, resulting in forward curling rather than reverse curling, which actually worsened inward-curling nails. Furthermore, in Production Example 5, which lacked a cationic initiator, uncured residue was observed on the surface.

[0097] Furthermore, in Production Example 6, where polythiol was omitted from the formulation, reverse curl occurred, and it was confirmed that the amount of curl was at the same level as in Production Example 2. However, despite increasing the content of acrylate compounds and cationic initiators for a high curing reaction, some uncured residue was observed on the surface. Therefore, it was confirmed that it is preferable to use polythiol to increase the amount of reverse curl, ensure curability, and maintain the straightening effect.

[0098] When using Production Example 7, which does not contain epoxysiloxane resin, shrinkage occurred during curing, resulting in a very low curl amount, and despite an increase in the amount of acrylate compound, the hardness was significantly lower.

[0099] According to the experimental results, when epoxysiloxane resin is used as the siloxane resin, a compound with a high number of functional groups is used as the acrylate compound, and a mixture of a cationic initiator and a short-wavelength radical initiator is used as the photoinitiator, it was confirmed that reverse curl occurs during curing and a corrective effect is provided while force is applied in the opposite direction to the bending of the nail tip. Furthermore, it was confirmed that when polythiol is incorporated, the amount of curl is high, curability is improved, and the corrective effect is further enhanced.

[0100] <Experimental Example 2: Correction Test for Inward-Rotating Nails> Two subjects were subjected to the application of the inward-turning nail correction composition of Manufacturing Example 1 to their nails in the same manner as in Experimental Example 1, and after hardening, the corrective effect was observed.

[0101] Figures 1 and 2 are photographs of the experimental results, showing that both subjects experienced a reduction in the curvature of both ends of their nails when the composition of the present invention was applied.

[0102] This confirmed that the inward-facing nail composition of the present invention actually exhibits a corrective effect on inward-facing nails.

[0103] <Experimental Example 3: Comparison of curing properties with a photocurable composition for displays> The photocurable composition of the comparative example was cured under the same conditions as in Experimental Example 1, and then its curling properties were observed.

[0104] As a result, it was confirmed that a uniform reverse curl did not occur on the curved surface of the nail tip, and cracks occurred in the cured product. This confirmed that in the case of photocurable compositions for displays, which require a high crosslinking density and a high proportion of polymerizable compounds, the flexibility is low and they are difficult to apply to curved surfaces such as inwardly curved nails.

[0105] Furthermore, when UV light was irradiated using a UV nail lamp instead of a UV lamp used in the display industry, high reaction heat was generated, posing a risk of burns when applied to inward-curving nails.

[0106] On the other hand, in Experimental Example 1, when a composition for correcting inwardly curved nails that satisfies the composition of the present invention was used, it was confirmed that the amount of curl was high while reverse curling occurred, the flexibility was excellent, the reverse curl could be maintained even on the bent surface, and the surface hardness was excellent. Thus, it was confirmed that the composition of the present invention exhibits properties optimized for correcting inwardly curved nails, unlike conventional photocurable compositions used in the electronics industry such as displays.

[0107] Although some embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and can be modified and transformed without departing from the spirit of the invention. Such modified and transformed forms should also be understood to belong to the technical concept of the present invention.

Claims

1. A composition for correcting inwardly growing nails, comprising a siloxane resin including an epoxysiloxane resin, an acrylate compound, and a photoinitiator, The acrylate compound is a polyfunctional acrylate compound having 8 to 18 acrylate functional groups. The photoinitiator comprises a cationic initiator and a radical initiator, The radical initiator includes a short-wavelength radical initiator having a maximum absorption peak at 300 nm or less. A composition for correcting inwardly turning nails.

2. The composition comprises 1 to 50% by weight of siloxane resin, 10 to 50% by weight of acrylate compound, 0.1 to 15% by weight of photoinitiator, and the remainder of solvent, based on the total weight of the composition. The composition for correcting inwardly curved nails according to claim 1.

3. The composition for correcting inwardly growing nails according to claim 1, further comprising a siloxane resin that does not have an epoxy group.

4. The composition for correcting inwardly turned nails according to claim 1, wherein the acrylate compound comprises at least one selected from the group consisting of urethane acrylate, epoxy acrylate, silicone-modified acrylate, and polyester acrylate.

5. The composition for correcting inwardly turned nails according to claim 1, wherein the weight ratio of the siloxane resin to the acrylate compound is 1:1 to 3:

1.

6. The composition for correcting inwardly turned nails according to claim 1, wherein the weight ratio of the cationic initiator to the radical initiator is 1:2 to 1:

50.

7. The inward-facing nail according to claim 1, wherein the composition further comprises polythiol. Orthodontic composition.

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