Nail sticker having a three-dimensional curved shape

Abstract

A nail sticker with a three-dimensional curved shape is disclosed. The nail sticker with a three-dimensional curved shape includes a body and a semi-cured layer. The bottom surface of the body is adhered to the nail. The body is flexible and has a three-dimensional curved shape corresponding to the shape of the nail. The semi-cured layer is disposed on the top surface of the body. The nail sticker is flexible and has a three-dimensional curved surface corresponding to the shape of the nail, such that it has a predetermined level of bending strength before the semi-cured layer cures.

Description

Technical Field

[0001] This disclosure relates to a nail sticker having a three-dimensional curved shape. Background Technology

[0002] Generally, artificial nails are used as a method of decorating nails, or nail stickers are used to enhance nail polish.

[0003] While artificial nails offer advantages such as better aesthetics compared to natural nails and the ability to extend from the natural nail, they also present problems such as a foreign body sensation, hair getting stuck between the natural and artificial nails, and contaminants seeping into the artificial nails.

[0004] On the other hand, the advantage of nail stickers lies in their excellent fit; hair won't get between the original nail and the sticker, and contaminants won't seep into the sticker. However, the problem is that these nail stickers are difficult to extend outwards from the original nail.

[0005] In addition, considering that the manufacture or use of artificial nails requires a high level of technology and a lot of cost and time, nail stickers with bases printed with various patterns in various colors have become popular.

[0006] In this context, the demand for nail stickers that offer a good fit and extend outwards from the original nail has gradually increased.

[0007] References

[0008] [Patent Documents]

[0009] Korean Patent Publication No. 10-1797203 (published on November 15, 2017) Summary of the Invention

[0010] Technical issues

[0011] The present disclosure aims to provide a nail sticker with a three-dimensional curved shape that provides an improved fit and extends outward from the nail.

[0012] Technical solution

[0013] In one aspect of this disclosure, a nail sticker is provided, comprising a body and a semi-cured layer, wherein the bottom surface of the body is adhered to a nail, the body is flexible and has a three-dimensional curved shape corresponding to the shape of the nail, and the semi-cured layer is disposed on the top surface of the body, wherein the nail sticker is flexible and has a three-dimensional curved surface corresponding to the shape of the nail, such that the nail sticker has a predetermined level of bending strength before the semi-cured layer cures.

[0014] The semi-cured layer extends from the nail cuticle layer. The free edge can have a uniform thickness.

[0015] The semi-cured layer has a thinner thickness at one end adjacent to the nail epithelium and at the other end adjacent to the free edge than the central portion.

[0016] The semi-cured layer may have a three-dimensional shape, with a thickness that increases from the nail epithelium toward the free edge.

[0017] The ratio of the thickness of one end of the epithelial layer of the nail sticker adjacent to the nail to the thickness of the other end of the free edge of the nail sticker adjacent to the nail can be 1.5 to 13.

[0018] The nail sticker can be flexible, such that before the semi-cured layer cures, when the top surface of the central portion of the nail sticker is pressurized under a load of 0.15 to 4.0 N, the nail sticker can deform and the bottom surface of the central portion of the nail sticker can be flattened.

[0019] The nail sticker can be flexible, such that after the semi-cured layer has cured, when the top surface of the central portion of the nail sticker is pressurized under a load of 11.0 N or greater, the nail sticker can deform and the bottom surface of the central portion of the nail sticker can be flattened.

[0020] The nail sticker extends to protrude from the free edge of the nail.

[0021] The semi-cured layer may include a light-curable component, and the semi-cured layer may be light-cured after the nail sticker is adhered to the nail.

[0022] Technical effect

[0023] Since the nail stickers according to embodiments of the present disclosure have a three-dimensional curved shape corresponding to the shape of the nail, they have an improved fit when adhered to the nail compared to the prior art.

[0024] Furthermore, since the nail sticker according to the embodiments of this disclosure has a three-dimensional curved surface, it can have a predetermined level of bending strength and can have improved properties such as bending resistance and flexural resistance, and can extend outward from the nail.

[0025] Furthermore, the nail stickers according to embodiments of this disclosure can prevent folding, breakage, cracking, etc. during use by curing a semi-cured layer after the nail sticker is adhered to the nail. Attached Figure Description

[0026] Figure 1 A perspective view of a nail sticker having a three-dimensional curved shape according to the present disclosure is shown.

[0027] Figure 2 It is along Figure 1 A cross-sectional view of AA is shown, and an embodiment of the semi-cured layer is illustrated.

[0028] Figure 3 It is along Figure 1 The image shows a cross-sectional view taken from AA, and also illustrates another embodiment of the semi-cured layer.

[0029] Figure 4 It is along Figure 1 The image shows a cross-sectional view taken from AA, and also illustrates another embodiment of the semi-cured layer.

[0030] Figure 5 It is along Figure 1 A cross-sectional view of the BB is shown, and an embodiment of the semi-cured layer is illustrated.

[0031] Figure 6 It is along Figure 1 A cross-sectional view of the BB is shown, and another embodiment of the semi-cured layer is also shown.

[0032] Figure 7 A flexibility test of a nail sticker according to an embodiment of the present disclosure is shown.

[0033] Figure 8 and Figure 9 A schematic diagram of the nail sticker having a three-dimensional curved shape according to the present disclosure is shown in use.

[0034] Figure 10 A schematic diagram is shown showing the state of transferring the leaf sticker to the bottom surface of the nail sticker after the nail sticker of the present disclosure has been adhered to the nail.

[0035] Figure 11 A perspective view of a nail sticker with a three-dimensional curved shape, according to the present disclosure, after being adhered to a nail is shown. Detailed Implementation

[0036] In order to fully understand this disclosure, its operational advantages, and the objectives achieved by performing this disclosure, it is necessary to refer to the accompanying drawings of the preferred embodiments of this disclosure and the contents described therein.

[0037] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in each drawing denote the same components.

[0038] Figure 1 A perspective view of a nail sticker with a three-dimensional curved shape according to the present disclosure is shown. Figure 2 It is along Figure 1 The cross-sectional view taken from section AA shows an embodiment of the semi-cured layer. Figure 3 It is along Figure 1 The cross-sectional view taken from section AA shows another embodiment of the semi-cured layer. Figure 4 It is along Figure 1 The cross-sectional view taken from section AA shows another embodiment of the semi-cured layer. Figure 5 It is along Figure 1 The cross-sectional view of the BB shows an embodiment of the semi-cured layer. Figure 6 It is along Figure 1 The cross-sectional view of BB shows another embodiment of the semi-cured layer. Figure 7 A flexibility test of a nail sticker according to an embodiment of the present disclosure is shown.

[0039] refer to Figures 1 to 7 The nail sticker 100 according to this disclosure has a three-dimensional curved shape corresponding to the shape of the nail M. Therefore, when the nail sticker 100 is adhered to the nail M, it can have an improved fit compared to nail stickers according to the prior art. Furthermore, the nail sticker 100 according to this disclosure has a predetermined level of bending strength due to its three-dimensional curved shape, and can therefore extend outward from the nail M.

[0040] The nail sticker 100 according to this disclosure includes a sticker body 110 that is adhered to a nail M, and a semi-cured layer 130 disposed on the top surface of the sticker body 110.

[0041] According to this embodiment, the adhesive body 110 is adhered to the user's nail M on its bottom surface. Furthermore, the adhesive body 110 is flexible and has a curved shape corresponding to the shape of the nail M.

[0042] The adhesive body 110 includes a release paper (not shown), an adhesive layer 111 removably adhered to the top surface of the release paper, a base layer 113 disposed on top of the adhesive layer 111, and a design layer 115 disposed between the base layer 113 and the semi-cured layer 130. Furthermore, according to this embodiment, the design layer 115 can be disposed between the adhesive layer 111 and the base layer 113.

[0043] Furthermore, the substrate 110 according to this embodiment may also include an intermediate layer 117 disposed on top of the design layer 115. When the intermediate layer 117 is added, the design layer 115 may be disposed between the base layer 113 and the intermediate layer 117.

[0044] According to this embodiment, the release paper prevents the adhesive components of the adhesive layer 111 from curing.

[0045] As described above, the adhesive layer 111, base layer 113, design layer 115, and semi-cured layer 130 can be stacked sequentially on top of the release paper. In a variation, the adhesive layer 111, base layer 113, design layer 115, intermediate layer 117, and semi-cured layer 130 can be stacked sequentially on top of the release paper. The adhesive layer 111, base layer 113, design layer 115, intermediate layer 117, and / or semi-cured layer 130 can be completely removed from the release paper.

[0046] Release paper can be obtained by coating the surface of a film or sheet with silicone, Teflon, fluorine, etc., said film or sheet being made of any one of paper, polyvinyl chloride (PVC), polyethylene (PE), polyurethane (PU), polypropylene (PP), polyethylene terephthalate (PET), polyolefin elastomer (POE), ethylene-vinyl acetate copolymer (EVA), and acrylic resin or a polymer thereof.

[0047] According to this embodiment, the adhesive layer 111 is adhered to the nail M.

[0048] The adhesive layer 111 may include any one of vinyl monomer-based polymeric adhesives, rubber-based adhesives, polyurethane-based two-component adhesives, or mixtures thereof.

[0049] The adhesive layer 111 preferably has an adhesive strength of 300 to 25,000 gf / in. The adhesive strength can be determined according to ASTM D3330 via a 180° peel test. For example, when adhesive layer 111 adheres to nail M, an adhesive strength of less than 300 gf / in will cause adhesive layer 111 to peel off nail M, thus allowing easy separation of adhesive layer 111 from nail M. On the other hand, if the adhesive strength of adhesive layer 111 is greater than 25,000 gf / in, the nail M may be damaged when the user separates adhesive layer 111 from nail M for replacement purposes. Therefore, adhesive layer 111 preferably has an adhesive strength of 300 to 25,000 gf / in.

[0050] In this embodiment, the adhesive layer 111 may be disposed at the bottom of the base layer 113 or at the bottom of the design layer 115.

[0051] The adhesive layer 111 may be completely disposed on the bottom surface of the base layer 113 or the design layer 115, or, taking into account the length of the nail M, partially disposed in the remaining area other than the area protruding from the free edge of the nail M.

[0052] When the adhesive layer 111 is completely disposed on the bottom surface of the base layer 113 or the design layer 115, the portion of the adhesive layer 111 located in the area protruding from the free edge of the nail M may become contaminated during use after adhesion. Therefore, to prevent contamination of the exposed adhesive layer, a UV topcoat or topcoat (dry) can be applied to the exposed adhesive layer 111, or the leaf sticker 170 can be adhered to the exposed adhesive layer 111 and then the adhesive layer can be transferred. When a UV topcoat or topcoat is applied, the nail sticker 100 is expected to become more robust and last longer. However, in this case, the additional operation is inconvenient. Therefore, considering ease of use, it is preferable to adhere the leaf sticker 170 to the exposed adhesive layer 111 (see...). Figure 11 ).

[0053] Meanwhile, when the adhesive layer 111 is disposed on a portion of the bottom surface of the base layer 113 or the design layer 115, the leaf patch 170 can be adhered to the bottom surface of the base layer 113 or the design layer 115 exposed from the free edge of the nail M, or a UV topcoat or top coating (dry) can be applied to the bottom surface to prevent foreign objects from being inserted between the patch body 110 and the nail M.

[0054] According to this embodiment, the base layer 113 is used to give the adhesive body 110 flexibility and increase the strength of the adhesive body 110, and can be stacked on top of the adhesive layer 111.

[0055] The substrate 113 may be a film or sheet made of any one of the following: polyvinyl chloride (PVC), polyethylene (PE), polyurethane (PU), thermoplastic polyurethane (TPU), polypropylene (PP), polyethylene terephthalate (PET), polyolefin elastomer (POE), ethylene-vinyl acetate copolymer (EVA), and acrylic resin, or a polymer thereof. However, the materials listed above for the substrate 113 are for illustrative purposes only, and the scope of this disclosure is not limited thereto. Furthermore, the substrate 113 may also include a filler (not shown), such as glass fiber.

[0056] According to this embodiment, the design layer 115 provides color or design. The design layer 115 may be provided such that it can be stacked on top of or at the bottom of the base layer 113.

[0057] Design layer 115 may be printed entirely in one color on top of or at the bottom of base layer 113, but is not limited thereto. In variations, the entire top or bottom of base layer 113 may be divided into multiple areas, and different colors or predetermined colors may be printed repeatedly in each area.

[0058] Design layer 115 can be formed on top of or under base layer 113 by processes such as gravure printing, screen printing, flexographic printing, digital printing, laser printing, UV printing, master printing, rotary printing, sealing printing, offset printing, pad printing, screen printing, air brush using an air gun, spraying, flocking, etc.

[0059] Furthermore, the design layer 115 may be a transparent or opaque film or sheet stacked on top of or under the base layer 113. Additionally, the design layer 115 may be a transparent holographic film comprising a base film having various shaped holographic patterns, designs, etc. The holographic film may have various colors or designs that change depending on the viewing direction. Additionally, the base film used for the transparent holographic film may comprise a polymer resin that is the same as or similar to the material of the base layer 113 listed above.

[0060] Meanwhile, according to this embodiment, when the design layer 115 is disposed on top of the base layer 113, the intermediate layer 117 can be further disposed on top of the design layer 115.

[0061] The intermediate layer 117 according to this embodiment is used to give the body 110 flexibility and increase the strength of the body 110, and can be stacked on top of the design layer 115.

[0062] The intermediate layer 117 can be formed in the same manner as the base layer 113; a detailed description of the intermediate layer is omitted here.

[0063] The semi-cured layer 130 according to this embodiment can be completely stacked on top of the substrate 110, and in particular, completely stacked on top of the design layer 115. Simultaneously, when the intermediate layer 117 is disposed on top of the design layer 115, the semi-cured layer 130 can be configured such that it can be completely stacked on top of the intermediate layer 117.

[0064] Furthermore, since the semi-cured layer 130 is disposed on top of the adhesive body 110, it has a three-dimensional curved shape that is the same as the shape of the adhesive body 110.

[0065] The semi-cured layer 130 has a certain degree of flexibility and remains semi-solid, and cures and transforms into a solid state after the adhesive body 110 is adhered to the nail M.

[0066] The semi-cured layer 130 includes both heat-curable and light-curable components, and can be heat-cured and then additionally light-cured. Furthermore, the semi-cured layer 130 may also include fillers, such as glass fibers.

[0067] The thermocurable and photocurable components can be dispersed in the semi-cured layer 130. In the semi-cured layer 130, the mixture of the thermocurable and photocurable components is thermocured by heating and then further photocured to cure the mixture, thereby maintaining flexibility.

[0068] In this embodiment, the term "thermocuring" includes not only the conventional meaning of thermocuring caused by thermal crosslinking due to heat treatment, but also the concept of partial curing that occurs when solvents or the like contained in the polymer or its mixtures are dried.

[0069] Furthermore, the semi-cured layer 130 according to this embodiment still includes uncured photocurable components remaining therein, although this thermal curing is caused by thermal crosslinking or partial curing, and thus can maintain a certain degree of flexibility.

[0070] The thermosetting component may include any and a combination thereof selected from polyvinyl chloride, polyethylene, polyurethane, polypropylene, polyethylene terephthalate, polyolefin elastomer, ethylene-vinyl acetate copolymer, polystyrene, polyvinylidene chloride, thermoplastic polyurethane, polyester, epoxy resin, acrylic resin, cellulose, polyol, and optionally a curing agent.

[0071] Any conventional polyol used in the synthesis of polyurethane resins can be used without particular restrictions. The content of the polyol is not particularly limited and can be determined by considering flexibility, hardness, and abrasion resistance. Furthermore, there are no particular restrictions on the curing agent, as long as it can form a thermosetting component.

[0072] Photocurable components include at least one of photopolymerizable monomers, oligomers and combinations thereof, and photoinitiators.

[0073] For example, the photocurable component has at least one epoxy group in the molecule and may include a bifunctional or higher functional epoxy (meth)acrylate monomer, a pentafunctional or higher functional organosilicon (meth)acrylate oligomer, and a photoinitiator.

[0074] For example, the photopolymerizable monomers and oligomers can be any of epoxy (meth)acrylates, polyurethane (meth)acrylates, polyester (meth)acrylates, etc.

[0075] Photoinitiators initiate reactions through the action of light. Specific examples of photoinitiators that can be used include ethyl phenylphosphine esters, trimethylbenzoylphosphine oxide, α-amino ketones, α-hydroxy ketones, acylphosphine oxides, phenylethyl dimethyl ketal, benzophenone, cationic (BASF), metallocene, phenylglyoxylate photoinitiators, etc., but the scope of this disclosure is not limited thereto.

[0076] The semi-cured layer 130 can be formed by: preparing a composition comprising a heat-curable component and a light-curable component; applying the liquid semi-cured layer 130 to the top surface of the design layer 115 or the intermediate layer 117; and then heat-curing the liquid semi-cured layer 130. As described above, by applying and heat-curing the liquid semi-cured layer 130, a semi-cured layer 130 having a shape corresponding to the shape of the top surface of the design layer 115 or the intermediate layer 117 can be easily prepared.

[0077] Because the photocurable components are retained in the semi-cured layer 130, the semi-cured layer 130 can maintain a certain degree of flexibility. The semi-cured layer 130, formed by thermosetting, includes photocurable components dispersed therein, and these components can be further photopolymerized by irradiating them with ultraviolet light. In other words, after the user adheres the adhesive base 110 to the nail M, the semi-cured layer 130 can be photocured and cured.

[0078] Furthermore, the semi-cured layer 130 has a uniform thickness T2 at the center of the top surface of the substrate 110, extending longitudinally from the nail bed of the nail M towards the free edge, and the semi-cured layer 130 has a thickness T2 at one end adjacent to the nail bed of the nail M and the other end adjacent to the free edge that is smaller than the thickness T2 of the center portion (see [reference]). Figure 2 Furthermore, the semi-cured layer 130 can have a uniform thickness T2 along the longitudinal direction of the nail M across the entire top surface of the substrate 110 (see [reference]). Figure 3 ).

[0079] According to the prior art, when the nail sticker 100 adheres to the nail M and the semi-cured layer 130 cures, bending occurs, causing the end of the nail sticker 100 protruding from the free edge of the nail M to lift upwards. However, according to this embodiment, the sticker body 110 has a three-dimensional curved shape corresponding to the shape of the nail M, and therefore bending of the end of the sticker body 110 can be prevented. Therefore, according to this embodiment, a semi-cured layer 130 with a different thickness T2 on the top surface of the sticker body 110 can be prepared.

[0080] According to this embodiment, the substrate 110 may have a thickness T1 of 50 to 300 μm, wherein the semi-cured layer 130 may have a thickness T2 of 200 to 1500 μm.

[0081] Furthermore, the semi-cured layer 130 may have a three-dimensional shape, with its thickness T2 increasing from the nail epithelium of the nail M toward the free edge of the nail M (see [reference]). Figure 4 ).

[0082] When the nail sticker 100 is adhered to the nail M and the semi-cured layer 130 is cured, the thickness T2 of the semi-cured layer can increase from one end of the nail sticker 100 adjacent to the nail epithelium of the nail M towards the other end of the free edge of the nail sticker 100 adjacent to the nail M, so that the cured semi-cured layer 130 can have the same or similar three-dimensional shape as an artificial nail. In this way, the nail sticker 100 according to this embodiment has a three-dimensional curved shape and a three-dimensional dome shape of the semi-cured layer 130, thus achieving excellent aesthetics similar to artificial nails.

[0083] According to this embodiment, the adhesive body 110 can have a thickness T1 of 50 to 300 μm. Furthermore, the thickness T2 of the semi-cured layer 130 can increase from one end of the adhesive body 110 adjacent to the nail epithelium of the nail M towards the other end of the adhesive body 110 adjacent to the free edge of the nail M, and the sum of the thickness T1 of the end of the adhesive body 110 protruding from the free edge of the nail M and the thickness T2 of the end of the semi-cured layer 130 (i.e., the thickness of the end of the nail sticker 100) can be 250 to 4000 μm.

[0084] Furthermore, the ratio of the thickness of the other end of the nail sticker 100 adjacent to the free edge of the nail M to the thickness of the nail epithelium at one end of the nail sticker 100 adjacent to the nail M can be 1.5 to 13. Specifically, the ratio of the thickness of the other end of the nail sticker 100 to the thickness of one end of the nail sticker can be 2 to 5, so that the nail sticker can have the natural shape of the nail M.

[0085] exist Figure 4 In the diagram, the top surface of the end of the semi-cured layer 130 is shown as being formed as a circle, but the top surface of the end of the semi-cured layer 130 may be formed as a fold.

[0086] Furthermore, the semi-cured layer 130 has a uniform thickness along the transverse direction of the nail M at the central portion of the top surface of the adhesive body 110, and the semi-cured layer 130 may have a thinner thickness at one end and the other end adjacent to the nail M than the thickness at the central portion (see [reference]). Figure 5 Furthermore, the semi-cured layer 130 has a uniform thickness along the transverse direction of the nail M across the entire top surface of the substrate 110 (see [link]). Figure 6 ).

[0087] Meanwhile, as described above, the nail sticker 100 according to this disclosure can be arranged to extend outward from the free edge of the nail M. According to the prior art, when the nail sticker 100 extends outward from the free edge of the nail M, there is a problem of folding patterns forming in the nail sticker 100. However, since the nail sticker 100 according to this disclosure has a three-dimensional curved shape, the nail sticker 100 itself can have a predetermined level of bending strength, and therefore, when the nail sticker 100 extends outward from the free edge of the nail M, folding patterns can be prevented from forming at the free edge of the nail M.

[0088] In other words, when the nail sticker 100 does not have a predetermined level of bending strength before the semi-cured layer 130 cures after being adhered to the nail M (i.e., when the nail sticker does not have a three-dimensional curved shape corresponding to the nail shape, but has a flat shape), extending the nail sticker 100 outward from the free edge of the nail M may cause a folding pattern to form at the free edge of the adjacent nail M. Then, when the semi-cured layer 130 cures in this state, the folding pattern remains unchanged, which reduces aesthetics. At the same time, when the nail sticker 100 has low flexibility after being adhered to the nail M and before the semi-cured layer 130 cures (i.e., when the nail sticker 100 is rigid), even when the nail sticker 100 extends outward from the free edge of the nail M, it is possible to prevent the formation of a folding pattern at the free edge of the adjacent nail M. However, since the nail sticker 100 is manufactured in a rigid state and has a large thickness, foreign objects may be introduced into the nail epithelial area of ​​the nail M between the nail M and the nail sticker 100, or hair may be inserted, which will frequently occur, resulting in a decrease in the fit of the nail sticker, and the nail sticker may also be lifted off the nail M.

[0089] In these cases, the nail sticker 100 according to this embodiment is designed to be flexible in such a way that, before the semi-cured layer 130 is cured, when the top surface of the central portion of the nail sticker 100 is pressurized under a load of 0.15 to 4.0 N, the top surface of the central portion of the nail sticker 100 is allowed to deform, such that the bottom surface of the central portion of the nail sticker 100 contacts the bottom (the bottom surface of the central portion of the nail sticker 100 is flattened). In this way, when the nail sticker 100 extends outward from the free edge of the nail M, it has a three-dimensional curved shape, thereby preventing the generation of folded patterns, and the nail sticker 100 has a predetermined level of flexibility, such that when the nail sticker is adhered to the top surface of the nail M, the nail sticker 100 can make close contact with the top surface of the nail M.

[0090] refer to Figure 7The flexibility of the nail sticker 100 according to this embodiment was tested using a physical property tester (model name: CTX texture analyzer) from BROOKFIELD Corporation. The distance between the pillars supporting the two ends of the nail sticker 100 was 10 mm. The diameter of the probe (cylindrical type) pressing the top surface of the center portion of the nail sticker 100 was 6 mm. When the probe (cylindrical type) pressed the top surface of the center portion of the nail sticker 100 at a speed of 0.5 mm / s, the load applied until the bottom surface of the center portion of the nail sticker 100 was flattened was measured.

[0091] When pressure is applied to the top surface of the nail sticker 100 before the semi-cured layer 130 is cured so that the bottom surface of the central portion of the nail sticker 100 can contact the bottom, the nail sticker 100 exhibits high flexibility when the pressure load is less than 0.15N. Therefore, extending the nail sticker 100 outward from the free edge of the nail M may cause a folded pattern to be generated at the free edge of the nail sticker 100 adjacent to the nail M. When the semi-cured layer 130 is cured in this state, the folded pattern will remain unchanged, thereby reducing the aesthetics.

[0092] On the other hand, when pressure is applied to the top surface of the nail sticker 100 before the semi-cured layer 130 is cured so that the bottom surface of the central portion of the nail sticker 100 contacts the bottom, the nail sticker 100 exhibits low flexibility when the pressure load is greater than 4.0 N. Therefore, when the nail sticker 100 extends outward from the free edge of the nail M, it can prevent folding patterns from forming at the free edge of the nail sticker 100 adjacent to the nail M. However, due to the increased thickness of the nail sticker 100, foreign objects may be introduced between the nail M and the nail sticker 100 in the epithelial region of the nail M, or hair insertion may occur frequently, resulting in a decrease in the fit and the nail sticker may also be lifted off the nail M.

[0093] Furthermore, when using the nail sticker 100 according to this disclosure, after it is adhered to the nail M and the semi-cured layer 130 is cured, the area protruding from the free edge of the nail M may break or bend due to external force. Therefore, in order to prevent the nail sticker 100 from folding, bending, breaking or cracking as it extends outward from the free edge of the nail M during use, the nail sticker is designed to be flexible, such that after the semi-cured layer 130 is cured, when pressure is applied to the top surface under a load of 11.0 N or greater, the top surface of the central portion of the nail sticker 100 deforms, thereby causing the bottom surface of the central portion of the nail sticker 100 to contact the bottom (the bottom surface of the central portion of the nail sticker 100 is flattened).

[0094] When pressure is applied to the top surface of the center portion of the nail sticker 100 after the semi-cured layer 130 has cured, causing the bottom surface of the center portion of the nail sticker 100 to contact the bottom, the nail sticker 100 exhibits high flexibility when the applied pressure load is less than 11.05N. Therefore, during use, the area of ​​the nail sticker 100 protruding from the free edge of the nail M may be frequently folded or bent due to external forces.

[0095] Furthermore, when the nail sticker 100 according to this disclosure extends to protrude from the free edge of the nail M, the length of the area protruding from the free edge of the nail M preferably does not exceed 2.5 times the length of the area adhered to the nail M. This is because such a large length is prone to bending or cracking during use.

[0096] For reference, the average length of the thumb nail is 12.83 mm, the average length of the index finger nail is 11.46 mm, the average length of the middle finger nail is 11.81 mm, the average length of the ring finger nail is 11.49 mm, and the average length of the little finger nail is 9.82 mm (see "Journal of the Korean Society of Beauty, Vol. 23, No. 3 (2017), pp. 491-497").

[0097] Furthermore, the nail sticker 100 according to this disclosure may also include a protective film 150 removably disposed on the top surface of the semi-cured layer 130.

[0098] The protective film 150 is provided in such a way that it can be additionally stacked on top of the semi-cured layer 130 to protect the semi-cured layer 130. The protective film 150 may include an ultraviolet-shielding material to prevent the photocurable components included in the semi-cured layer 130 from being cured by ultraviolet light contained in natural light. Furthermore, the protective film is capable of preventing the semi-cured layer 130 from being contaminated by foreign matter.

[0099] The protective film 150 can be obtained by coating the surface of a film or sheet with silicone, fluorine, etc., the film or sheet being made of any one of paper, polyvinyl chloride, polyethylene, polyurethane, polypropylene, polyethylene terephthalate, polyolefin elastomer, ethylene-vinyl acetate copolymer and acrylic resin or a polymer thereof.

[0100] The following describes the process of adhering the nail sticker 100, which has a three-dimensional curved shape according to the present disclosure, to the nail.

[0101] Figure 8 and Figure 9 A schematic diagram illustrating the usage of a nail sticker with a three-dimensional curved shape according to this disclosure is shown. Figure 10The diagram shows a state in which the leaf-shaped nail sticker, having been adhered to the nail according to the present disclosure, is transferred to the bottom surface of the nail sticker after the leaf-shaped nail sticker has been adhered to the nail. Figure 11 This is a perspective view showing a nail sticker with a three-dimensional curved shape according to the present disclosure after it has been adhered to a nail.

[0102] refer to Figure 8 Remove the release paper from the adhesive base 110. Furthermore, after removing the release paper, the adhesive layer 111 is allowed to come into close contact with the nail M. When the protective film 150 is disposed on the top surface of the semi-cured layer 130, the protective film 150 can be removed from the semi-cured layer 130 before the adhesive layer 111 is adhered to the nail M.

[0103] Then, pressure is applied to the top surface of the semi-cured layer 130 so that the adhesive layer 111 can adhere to the nail M. Here, the top surface of the semi-cured layer 130 is pressed under a predetermined level of force to prevent the adhesive body 110 from being lifted off the top surface of the nail M. Since the nail sticker 100 according to the prior art has a flat bottom surface, in order to prevent wrinkles from forming on the nail sticker 100 after it adheres to the nail M, it is necessary to stretch the nail sticker 100 with a predetermined level of force to make the nail sticker 100 adhere to match the shape of the nail M. However, since the nail sticker 100 according to this embodiment has a three-dimensional curved shape, the nail sticker 100 can be adhered to the nail M simply by pressing down on the top surface of the nail sticker 100 (i.e., the semi-cured layer 130), thereby improving the ease of use.

[0104] In addition, refer to Figure 9 After the nail sticker 100 is adhered to the nail M, the semi-cured layer 130 is cured by irradiating it with ultraviolet light. When the semi-cured layer 130 is cured, only the sticker body 110 and the cured semi-cured layer 130 remain on the top surface of the nail M while it is being adhered to the nail M.

[0105] Simultaneously, as the nail sticker 100 extends outward from the free edge of the nail M, the adhesive layer 111 may be exposed and contaminated. Therefore, as... Figure 10 As shown, the leaf sticker 170 can be adhered to the adhesive layer 111 located on the bottom surface of the nail sticker 100 extending outward from the free edge of the nail M to prevent the adhesive layer 111 from being contaminated.

[0106] Figure 11A nail sticker 100 is shown adhered to a nail M, wherein a leaf-shaped sticker 170 is adhered to an adhesive layer 111, and the nail sticker 100 extends to protrude from the free edge of the nail M. Because the nail sticker 100 according to this embodiment has a three-dimensional curved shape, it can provide an improved fit when adhered to the nail M compared to nail stickers 100 according to the prior art, and can be arranged to extend outward from the free edge of the nail M to achieve an aesthetic similar to artificial nails.

[0107] This disclosure has been described in detail with reference to specific examples, but its scope is not limited thereto. Those skilled in the art will understand that various changes and modifications can be made without departing from the scope of this disclosure, and such changes and modifications also fall within the scope of this disclosure.

[0108] [Detailed Description of Key Components]

[0109] 100: Nail stickers 110: Main body stickers

[0110] 111: Adhesive layer; 113: Base layer

[0111] 115: Design Layer 117: Intermediate Layer

[0112] 130: Semi-cured layer; 150: Protective film

[0113] 170: Leaflet

[0114] Industrial applicability

[0115] The nail sticker with a three-dimensional curved shape according to this disclosure can have an improved fit and can extend outward from the nail.

Claims

1. A nail sticker with a three-dimensional curved shape, comprising: The adhesive body is attached to the nail on its bottom surface. The adhesive body is flexible and has a three-dimensional curved shape corresponding to the shape of the nail. and a semi-cured layer disposed on the top surface of the adhesive body, The nail sticker is flexible and has a three-dimensional curved surface corresponding to the shape of the nail, so that the nail sticker has a predetermined level of bending strength before the semi-cured layer cures.

2. The nail sticker with a three-dimensional curved shape according to claim 1, wherein, The semi-cured layer has a uniform thickness from the nail epithelium toward the free edge of the nail.

3. The nail sticker with a three-dimensional curved shape according to claim 1, wherein, The semi-cured layer has a thinner thickness at one end adjacent to the nail epithelium and at the other end adjacent to the free edge than the central portion.

4. The nail sticker with a three-dimensional curved shape according to claim 1, wherein, The semi-cured layer has a three-dimensional shape and a thickness that increases from the nail epithelium toward the free edge.

5. The nail sticker with a three-dimensional curved shape according to claim 4, wherein, The ratio of the thickness of the nail sticker at one end adjacent to the nail epithelium to the thickness of the nail sticker at the other end adjacent to the free edge of the nail is 1.5 to 13.

6. The nail sticker with a three-dimensional curved shape according to claim 1, wherein the nail sticker is flexible such that, before the semi-cured layer is cured, when the top surface of the central portion of the nail sticker is pressurized under a load of 0.15 to 4.0 N, the nail sticker can deform and the bottom surface of the central portion of the nail sticker can be flattened.

7. The nail sticker with a three-dimensional curved shape according to claim 1, wherein the nail sticker is flexible such that, after the semi-cured layer has cured, when the top surface of the central portion of the nail sticker is pressurized under a load of 11.0 N or greater, the nail sticker can deform and the bottom surface of the central portion of the nail sticker can be flattened.

8. The nail sticker having a three-dimensional curved shape according to claim 1, wherein the nail sticker extends to protrude from the free edge of the nail.

9. The nail sticker with a three-dimensional curved shape according to claim 1, wherein, The semi-cured layer includes a light-curable component, and the semi-cured layer is light-cured after the nail sticker is adhered to the nail.

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