Transfer tape

Abstract

To provide a nail printer transfer tape that can transfer a transfer layer to a nail surface in accordance with nails having various sizes and various shapes, where the transfer layer transferred to a nail surface has an excellent image receiving performance for printing by an inkjet printer, and allows a user to select any pattern according to user's taste and to decorate the nail with the pattern.SOLUTION: A transfer tape transfers a white image receiving layer for an inkjet type nail printer on a nail. The transfer tape includes at least the white image receiving layer and an adhesive layer which are laminated in this order from a side of a substrate. The substrate is a polyethylene terephthalate having a thickness of 5 μm or more and 26 μm or less. The white image receiving layer includes: a styrene copolymer as a binder; and 60 wt.% or more and 85 wt.% or less of a titanium oxide in a solid content of the white image receiving layer.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a transfer tape for a nail printer, which is used to transfer a white image-receiving layer onto the surface of a nail for applying decorations such as pictures using an inkjet printer. [Background technology]

[0002] Transfer tapes for imparting gloss or decoration to the surface of fingernails or toenails have been proposed. Patent Document 1 proposes a nail art transfer sticker as one such transfer tape, which includes a transfer section having a transparent layer, a design layer, and an adhesive layer above the transparent layer and design layer, laminated on a support sheet, and the transparent layer is soluble in a top coat applied to the surface of the transfer section transferred to the nail via the adhesive layer. However, the nail art transfer sticker of Patent Document 1 is a transfer sticker with a design layer laminated from the beginning, and users cannot select any design they like.

[0003] Also, Patent Document 2 proposes a nail decoration transfer sheet characterized by comprising a transfer layer in which an adhesive layer and an ink layer are laminated, and a substrate sheet to which the surface opposite to the adhesive surface of the transfer layer is releasably attached. However, the nail decoration transfer sheet of Patent Document 2 requires that after forming the nail adhesive piece to have approximately the same width as the nail, the nail adhesive piece at the tip edge of the nail needs to be cut to fit the nail, that is, the transfer layer needs to be torn off to fit the edge of the nail, and the nail adhesive piece needs to be cut to fit the shape of the nail. It was not something that could be easily attached. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-337601 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-225496 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of the above circumstances, and the problem that the present invention aims to solve is to provide a transfer tape for a nail printer that can be transferred to the surface of nails of various sizes and shapes, and the transfer layer transferred to the nail surface has excellent image-receiving properties for printing by an inkjet printer, so that the user can select any pattern that suits their taste and decorate their nail with it. [Means for solving the problem]

[0006] The first invention is a transfer tape for transferring a white image-receiving layer onto a nail for an inkjet nail printer, the transfer tape being formed by laminating at least the white image-receiving layer and an adhesive layer on a substrate in this order from the substrate side, the substrate being made of polyethylene terephthalate with a thickness of 5 μm to 26 μm, the white image-receiving layer being made of a styrene copolymer as a binder, The white image-receiving layer contains 14% by weight or more and 38% by weight or less of the solid content thereof. The white image-receiving layer contains titanium oxide in an amount of 60% by weight or more and 85% by weight or less of the solid content thereof. With the adhesive layer in contact with the nail, the transfer tape on the side opposite to the adhesive layer is pressed with a transfer spatula containing an elastomer as its main component, thereby transferring the white image-receiving layer and the adhesive layer from the substrate to the nail. The transfer tape is characterized by the following:

[0007] The second invention is a method for producing a styrene copolymer, the method comprising the step of: of The transfer tape according to the first aspect of the present invention is characterized in that it is a styrene copolymer.

[0008] A third invention is the transfer tape according to the first or second invention, characterized in that the thickness of the white image-receiving layer is 15 μm or more and 35 μm or less. [Effects of the Invention]

[0009] The present invention provides a transfer tape for nail printers, comprising a polyethylene terephthalate substrate having a thickness of 5 to 26 μm, a white image-receiving layer, and an adhesive layer laminated in that order, the white image-receiving layer containing a styrene copolymer as a binder and titanium oxide in an amount of 60% by weight to 85% by weight of the solid content of the white image-receiving layer. This configuration of the nail printer transfer tape ensures good sharpness of the white image-receiving layer during transfer, and the white image-receiving layer transferred to the nail exhibits excellent image-receiving performance when printed with an inkjet printer. Therefore, the transfer tape of the present invention allows the transfer layer, consisting of the white image-receiving layer and adhesive layer, to be easily transferred to the shape of the nail, and the transferred white image-receiving layer serves as a base for the image printed with the inkjet printer, ensuring reliable reproduction of the image to be printed on the nail. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing the layer structure of transfer tape A, which is an example of the transfer tape of the present invention. [Figure 2] FIG. 2 is a diagram showing the shape of transfer spatula B, which is an example of a transfer spatula used with the transfer tape of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] The transfer tape of the present invention will be described in more detail below.

[0012] [Transfer tape] The transfer tape of the present invention is a transfer tape in which at least a white image-receiving layer and an adhesive layer are laminated on a substrate in the order of the white image-receiving layer and the adhesive layer from the substrate side. By transferring the adhesive layer and the white image-receiving layer from the substrate of the transfer tape of the present invention to a nail, it is possible to transfer a white image-receiving layer that can receive an image printed by an inkjet printer onto the surface of the nail.

[0013] FIG. 1 shows transfer tape A, an example of a transfer tape of the present invention. As shown in FIG. 1, the transfer tape of the present invention is a transfer tape in which a white image-receiving layer (11) and an adhesive layer (12) are laminated in this order from the substrate side on one side of a substrate (10). The transfer tape of the present invention may have a release layer between the substrate (10) and the white image-receiving layer (11). By providing a release layer, the transferability of the white image-receiving layer (11) and the adhesive layer (12) from the substrate (10) to a nail can be improved. However, if the release layer is transferred along with the white image-receiving layer (11) during transfer of the white image-receiving layer (11), the image-receiving performance of the transferred white image-receiving layer (11) in an inkjet printer may be reduced. Therefore, it is preferable that the release layer is a layer that is not reliably transferred during transfer of the white image-receiving layer (11). Furthermore, a separator that can be peeled off from the adhesive layer may be provided on the adhesive layer to prevent dirt and dust from adhering to the adhesive layer.

[0014] (base material) Polyethylene terephthalate is suitable as the substrate used in the transfer tape of the present invention, as it provides excellent transferability of the white image-receiving layer and adhesive layer (hereinafter, the white image-receiving layer and adhesive layer are collectively referred to as the transfer layer) and excellent sharpness of the transfer layer during transfer. When polyethylene terephthalate is used as the substrate, the thickness of the substrate is preferably 5 μm to 26 μm, and more preferably 9 μm to 17 μm. If the thickness of the substrate is less than 5 μm or more than 26 μm, the sharpness of the transfer layer during transfer decreases. Here, the sharpness of the transfer layer refers to the ease with which the transferred portion of the transfer layer separates from the surrounding untransferred transfer layer. If the sharpness of the transfer layer decreases, burrs or tears may occur around the transferred transfer layer, which not only deteriorates the appearance of the transferred transfer layer, but also may reduce the image-receiving performance of the white image-receiving layer when printed by an inkjet printer.

[0015] (white image-receiving layer) The white image-receiving layer is a layer that is transferred to a nail and receives images printed by an inkjet printer. In addition, if no release layer is provided between the substrate and the white image-receiving layer, the white image-receiving layer preferably has releasability that allows it to be peeled from the substrate, and also has the ability to be easily laminated onto the substrate. From the viewpoint of being easily laminated onto the substrate, the white image-receiving layer is preferably a layer that contains a resin as a binder. The binder is a component of each layer formed by coating, and is a component used to retain components such as particles and additives contained in each layer within each layer. Among various resins, a styrene copolymer is preferred as the resin used as the binder for the white image-receiving layer from the viewpoints of image-receiving performance for inkjet printer printing and durability, including abrasion resistance, water resistance, and solvent resistance, when the white image-receiving layer becomes a surface layer after transfer to the nail surface. Furthermore, by using a styrene copolymer, a copolymer of styrene and at least one selected from isoprene, butadiene, ethylene, and butylene, as the binder for the white image-receiving layer, it is possible to particularly improve both the image-receiving performance of the white image-receiving layer when printed by an inkjet printer and the durability, including abrasion resistance, water resistance, and solvent resistance, of the surface layer after transfer to the nail surface. While other resins can be used in addition to the styrene copolymer as the binder for the white image-receiving layer, it is preferable to use a resin that does not impair the image-receiving performance when printed by an inkjet printer obtained by using the styrene copolymer, or the durability, including abrasion resistance, water resistance, and solvent resistance, of the surface layer after transfer to the nail surface. Examples of such resins include alicyclic saturated hydrocarbons.

[0016] The styrene copolymer content in the white image-receiving layer is preferably 14% by weight or more and 38% by weight or less of the solid content of the white image-receiving layer. If the styrene copolymer content in the solid content of the white image-receiving layer is less than 14% by weight, durability including abrasion resistance, water resistance, and solvent resistance will decrease. On the other hand, if the styrene copolymer content in the solid content of the white image-receiving layer exceeds 38% by weight, image receiving performance when printing with an inkjet printer will decrease, and printing defects may occur.

[0017] The white image-receiving layer is a layer that receives the image printed by an inkjet printer and is transferred to the nail to conceal the color of the nail. Because the white image-receiving layer conceals the color of the nail, the print produced on the white image-receiving layer by the inkjet printer is not affected by the color of the nail, and the intended color is reproduced. To ensure this concealing performance, the white image-receiving layer contains a white pigment.

[0018] Among various white pigments, titanium oxide is the most preferred white pigment to be contained in the white image-receiving layer. By including titanium oxide, sufficient hiding power can be ensured, and because titanium oxide has the property of absorbing ink from inkjet printers, image-receiving performance with inkjet printers can also be ensured. Furthermore, by including titanium oxide, the sharpness of the white image-receiving layer can be improved, resulting in good transferability to nails.

[0019] The titanium oxide content in the white image-receiving layer is preferably 60% by weight or more and 85% by weight or less of the solid content of the white image-receiving layer. If the titanium oxide content in the solid content of the white image-receiving layer is less than 60% by weight, the image-receiving performance when printed using an inkjet printer will decrease, as will the whiteness and hiding performance of the white image-receiving layer. This will result in the color printed using an inkjet printer not appearing as intended, and the reproducibility of the printed color will decrease. On the other hand, if the titanium oxide content in the solid content of the white image-receiving layer exceeds 85% by weight, durability, including abrasion resistance, water resistance, and solvent resistance, will decrease, and the white image-receiving layer will be more susceptible to scraping and peeling when wet after transfer onto the nail.

[0020] The average particle size of titanium oxide used in the white image-receiving layer is preferably 0.1 μm to 0.5 μm, more preferably 0.2 μm to 0.4 μm. If the average particle size is less than 0.1 μm, the viscosity of the coating solution increases, making it difficult to apply to the substrate. Furthermore, if the average particle size exceeds 0.5 μm, uniform dispersion in the coating solution becomes difficult. The average particle size here was measured using a laser diffraction particle size analyzer "SALD-1100" manufactured by Shimadzu Corporation. The particle amount standard (dimension) used to calculate the average particle size is based on volume. The thickness of the white image-receiving layer (thickness after drying, hereinafter the same) is preferably 15 μm to 35 μm. If the thickness of the white image-receiving layer is less than 15 μm, the image-receiving performance when printing with an inkjet printer will decrease, as will the whiteness and hiding performance of the white image-receiving layer. This will result in the color of the inkjet printer printing not appearing as intended, and the reproducibility of the printed color will decrease. Furthermore, if the thickness of the white image-receiving layer exceeds 35 μm, the sharpness of the white image-receiving layer decreases, and burrs tend to occur around the periphery of the transferred white image-receiving layer.

[0021] The white image-receiving layer can be formed by dispersing or dissolving the above-mentioned materials in an appropriate solvent to prepare a coating liquid, applying the coating liquid to a substrate by a known method such as roll coating, reverse roll coating, gravure coating, reverse gravure coating, bar coating, or rod coating to form a coating film, and then drying the coating film.

[0022] The white image-receiving layer may contain various additives within a range that does not impair the various functions required of the white image-receiving layer. Examples of such additives include plasticizers, antifoaming agents, surfactants, antioxidants, dispersants, etc. These additives are preferably additives commonly used in cosmetics, and more preferably additives that are highly safe for the skin.

[0023] (adhesive layer) In the transfer tape of the present invention, an adhesive layer is provided as the outermost layer on the white image-receiving layer (the outermost layer excluding a peelable layer such as a separator that protects the adhesive layer). In the transfer tape of the present invention, the white image-receiving layer that receives the image printed by the inkjet printer and the adhesive layer that imparts adhesiveness to nails are functionally separated, which allows the adhesive layer to have sufficient adhesive strength while also improving the sharpness of the transfer layer including the white image-receiving layer and the adhesive layer.

[0024] While various adhesive resins can be used as materials for the adhesive layer, acrylic adhesives are preferred among various adhesive resins due to their ease of adjusting adhesive strength and their tendency to develop adhesiveness when pressure is applied. The adhesive strength of the adhesive layer is preferably 0.5 N / 25 mm width or more and 2.0 N / 25 mm width or less. If the adhesive strength of the adhesive layer is less than 0.5 N / 25 mm, adhesion may not be maintained when used for a long period of time (more than one week) after transfer, and lifting or peeling may occur. On the other hand, if the adhesive strength of the adhesive layer exceeds 2.0 N / 25 mm, the adhesive strength is too strong, making it difficult to peel the transfer layer containing the adhesive layer from the nail after use.

[0025] (Adhesion strength measurement of adhesive layer) The adhesive strength of the adhesive layer can be measured using the following method. An adhesive layer is laminated onto a release sheet treated with silicone release agent on the surface of a PET substrate, and a white image-receiving layer is then laminated onto the adhesive layer to prepare an adhesive strength test sheet. Single-sided adhesive tape (Nitto Denko Nitto 31B, tape width: 25 mm) is applied to the white image-receiving layer of the adhesive strength test sheet. The adhesive strength test sheet is then cut along both ends of the single-sided adhesive tape to prepare an adhesive strength test piece measuring 150 mm in length and 25 mm in width. The release sheet is peeled off from the adhesive strength test piece, and the exposed adhesive layer is pressed against a 2 mm thick stainless steel plate (SUS304 steel plate specified in JIS G4305, with a surface finish of BA (cold-rolled, bright heat treated), and a surface roughness of Ra: 50 ± 25 nm specified in JIS B0601) using a 2 kg roller, which moves back and forth once. After pressing, the test piece is left at room temperature for approximately 24 hours. Next, using a tensile tester at room temperature and humidity, the transfer tape is peeled off from the stainless steel plate in the longitudinal direction of the transfer tape at a peel angle of 180° and a peel speed of 1200 mm / min to measure the adhesive strength (N / 25 mm) of the adhesive layer of the transfer tape.

[0026] The thickness of the adhesive layer (thickness after drying, hereinafter the same) is preferably 0.5 μm or more and 2.5 μm or less. If the thickness of the adhesive layer is less than 0.5 μm, adhesion may not be maintained when used for a long period of time (more than one week) after transfer, and lifting or peeling may occur. On the other hand, if the thickness of the adhesive layer is more than 2.5 μm, the adhesive strength is too strong, making it difficult to peel the transfer layer including the adhesive layer from the nail after use.

[0027] (Transfer spatula) When used with an elastomer transfer spatula, the transfer tape of the present invention can easily transfer a transfer layer containing an adhesive layer and a white image-receiving layer onto a nail, and the transfer layer can be fixed to the nail without lifting or peeling. The elastomer may be a material whose main component is elastomer, but it does not necessarily have to be a 100% elastomer material. Furthermore, the entire transfer spatula does not need to be made of elastomer; at least the tip of the transfer spatula, which presses the transfer tape to transfer the transfer layer of the transfer tape onto the nail, needs to be made of elastomer.

[0028] The Vickers hardness of the elastomer used in the transfer spatula should preferably be between 43HV and 70HV. If the Vickers hardness of the elastomer is less than 43HV, the adhesive layer of the transfer tape may not adhere well to the nail, resulting in lifting or peeling of the transfer layer after transfer. On the other hand, if the Vickers hardness of the elastomer exceeds 70HV, the white image-receiving layer may be scratched or deformed during transfer, resulting in reduced image reception performance in inkjet printers and a poor appearance of the nail after transfer. The Vickers hardness (HV) of the elastomer is the average value of three measurements taken in accordance with JIS Z2244 using a microhardness tester (Mitutoyo Corporation HM221) with a load of 0.01N applied to a flat portion of the elastomer material for 15 seconds. As long as the Vickers hardness is within the above range, there are no particular restrictions on the elastomer material to be used, and various rubber materials such as polyurethane elastomers, olefin elastomers, styrene elastomers, polyamide elastomers, nylon 12 elastomers, polyester elastomers, and acrylic rubber, NBR, isoprene rubber, SBR, butadiene rubber, silicone rubber, and butyl rubber can be used.

[0029] The area of ​​the tip of the transfer spatula that presses the transfer tape is 2 mm 2 (For example, 1mm length x 2mm width) or more than 6mm 2 (For example, 2 mm length × 3 mm width) or less. 2 If the area is less than 2 mm, the pressing force per unit area will be too large, which may damage the white image-receiving layer. 2 If the area is less than 6mm, the tip of the transfer spatula will be easily damaged. 2 If the pressure applied to the transfer tape per unit area exceeds this value, the pressure applied to the transfer tape will be small, causing the adhesive layer of the transfer tape to not adhere sufficiently, which may result in lifting or peeling of the transfer layer after transfer.

[0030] The shape of the pressing surface at the tip of the transfer spatula is preferably rectangular or square. By making the shape of the pressing surface rectangular or square, it is possible to apply a uniform pressing force to the transfer tape surface pressed by the transfer spatula by moving the transfer spatula over the nail along one side of the rectangle or square. When the shape of the pressing surface at the tip of the transfer spatula is rectangular, it is preferable that the length of the longer side is 3 mm or less. The surface of the nail is curved, and if the longer side of the rectangle exceeds 3 mm, the tip of the transfer spatula cannot follow the curved surface of the nail, and the transfer spatula cannot apply uniform pressure to the transfer tape, which makes it more likely that poor transfer of the transfer layer will occur.

[0031] (inkjet printer) In the present invention, an inkjet printer can be preferably used as a so-called nail printer, which is a printer that prints an image or the like on the white image-receiving layer of the transfer tape transferred onto a nail. The ink ejected for printing by an inkjet printer used as a nail printer preferably does not contain an organic solvent as a solvent, since it is used on the human body. However, when the ink contains an active energy ray-curable composition, an organic solvent may be used as the ink solvent. When the ink contains an organic solvent, the organic solvent may penetrate into the image-receiving layer and dissolve it, causing cracks in the image-receiving layer. Cracking of the image-receiving layer not only deteriorates the appearance of the image-receiving layer surface after printing, but in severe cases, the image-receiving layer may even lift off. However, because the white image-receiving layer transferred onto a nail using the transfer tape of the present invention uses a styrene copolymer as a binder, cracks do not occur on the surface of the white image-receiving layer, even when receiving ink containing an organic solvent.

[0032] (Example) The present invention will be explained in more detail using the following examples and comparative examples. However, the present invention is not limited to these examples. Hereinafter, when the amount of each material is expressed as "parts," it means "parts by weight" unless otherwise specified.

[0033] (transfer tape) Example 1 (white image-receiving layer) A white image-receiving layer coating liquid prepared by kneading the materials according to the following formulation was applied to a 6 μm-thick PET (biaxially oriented polyethylene terephthalate) film and dried to form a 25 μm-thick white image-receiving layer. (White image-receiving layer coating liquid) Titanium oxide (average particle size 0.3 μm, solid content 100%) 37.5 parts Styrene-isoprene-styrene copolymer (100% solids) 11.9 parts Polycarboxylic acid type dispersant (solid content 40%) 1.5 parts Toluol 49.1 parts Total 100.0 copies

[0034] The adhesive layer coating liquid described below was applied onto the white image-receiving layer of the transfer tape of Example 1, and heated and dried at 100°C for 2 minutes to form an adhesive layer with a thickness of 1.5 μm after drying. (Adhesive layer coating liquid) Acrylic copolymer (hydroxybutyl acrylate, butyl acrylate copolymer, weight average molecular weight: approximately 500,000, solid content 37%) 100.0 parts Hexamethylene diisocyanate (solid content 37.5%) 0.5 parts Total 100.5 copies

[0035] The adhesive layer of the transfer tape of Example 1 and the release agent-coated side of a 25 μm thick cover film (made of polyethylene terephthalate) coated with a silicone-based release agent were placed facing each other and sandwiched between two rolls (a rubber roll and a metal roll), and the two were bonded together while allowing air to escape, thereby obtaining the transfer tape of Example 1 of the present invention.

[0036] Example 2 A transfer tape of Example 2 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a PET (biaxially oriented polyethylene terephthalate) film having a thickness of 12 μm.

[0037] Example 3 A transfer tape of Example 3 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a PET (biaxially oriented polyethylene terephthalate) film having a thickness of 25 μm.

[0038] Example 4 The transfer tape of Example 4 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a 12 μm thick PET (biaxially oriented polyethylene terephthalate) film and the white image-receiving layer coating liquid was changed to the following formulation. (White image-receiving layer coating liquid) Titanium oxide (average particle size 0.3 μm, solid content 100%) 37.5 parts Styrene-butadiene-styrene copolymer (100% solids) 11.9 parts Polycarboxylic acid type dispersant (solid content 40%) 1.5 parts Toluol 49.1 parts Total 100.0 copies

[0039] Example 5 The transfer tape of Example 5 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a 12 μm thick PET (biaxially oriented polyethylene terephthalate) film and the white image-receiving layer coating liquid was changed to the following formulation. (White image-receiving layer coating liquid) Titanium oxide (average particle size 0.3 μm, solid content 100%) 37.5 parts Styrene-butadiene copolymer (100% solids) 11.9 parts Polycarboxylic acid type dispersant (solid content 40%) 1.5 parts Toluol 49.1 parts Total 100.0 copies

[0040] Example 6 The transfer tape of Example 6 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a 12 μm thick PET (biaxially oriented polyethylene terephthalate) film and the white image-receiving layer coating liquid was changed to the following formulation. (White image-receiving layer coating liquid) Titanium oxide (average particle size 0.3 μm, solid content 100%) 37.5 parts Styrene-ethylene-butylene-styrene copolymer (100% solids) 11.9 parts Polycarboxylic acid type dispersant (solid content 40%) 1.5 parts Toluol 49.1 parts Total 100.0 copies

[0041] Example 7 The transfer tape of Example 7 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a 12 μm thick PET (biaxially oriented polyethylene terephthalate) film and the white image-receiving layer coating liquid was changed to the following formulation. (White image-receiving layer coating liquid) Titanium oxide (average particle size 0.3 μm, solid content 100%) 37.5 parts Styrene-acrylic copolymer (100% solids) 11.9 parts Polycarboxylic acid type dispersant (solid content 40%) 1.5 parts Toluol 49.1 parts Total 100.0 copies

[0042] Example 8 A transfer tape of Example 8 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a PET (biaxially oriented polyethylene terephthalate) film having a thickness of 10 μm.

[0043] Example 9 A transfer tape of Example 9 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a PET (biaxially oriented polyethylene terephthalate) film having a thickness of 16 μm.

[0044] Example 10 A transfer tape of Example 10 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a PET (biaxially oriented polyethylene terephthalate) film having a thickness of 20 μm.

[0045] Example 11 The transfer tape of Example 11 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a 12 μm thick PET (biaxially oriented polyethylene terephthalate) film and the white image-receiving layer coating liquid was changed to the following formulation. (White image-receiving layer coating liquid) Titanium oxide (average particle size 0.3 μm, solid content 100%) 31.0 parts Styrene-isoprene-styrene copolymer (solids 100%) 18.4 parts Polycarboxylic acid type dispersant (solid content 40%) 1.5 parts Toluol 49.1 parts Total 100.0 copies

[0046] Example 12 The transfer tape of Example 12 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a 12 μm thick PET (biaxially oriented polyethylene terephthalate) film and the white image-receiving layer coating liquid was changed to the following formulation. (White image-receiving layer coating liquid) Titanium oxide (average particle size 0.3 μm, solid content 100%) 34.0 parts Styrene-isoprene-styrene copolymer (100% solids) 15.4 parts Polycarboxylic acid type dispersant (solid content 40%) 1.5 parts Toluol 49.1 parts Total 100.0 copies

[0047] Example 13 The transfer tape of Example 13 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a 12 μm thick PET (biaxially oriented polyethylene terephthalate) film and the white image-receiving layer coating liquid was changed to the following formulation. (White image-receiving layer coating liquid) Titanium oxide (average particle size 0.3 μm, solid content 100%) 42.0 parts Styrene-isoprene-styrene copolymer (100% solids) 7.4 parts Polycarboxylic acid type dispersant (solid content 40%) 1.5 parts Toluol 49.1 parts Total 100.0 copies

[0048] (Comparative Example 1) A transfer tape of Comparative Example 1 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a PET (biaxially oriented polyethylene terephthalate) film having a thickness of 4.5 μm.

[0049] (Comparative Example 2) A transfer tape of Comparative Example 2 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a PET (biaxially oriented polyethylene terephthalate) film having a thickness of 50 μm.

[0050] (Comparative Example 3) The transfer tape of Comparative Example 3 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a 12 μm thick PET (biaxially oriented polyethylene terephthalate) film and the white image-receiving layer coating liquid was changed to the following formulation. (White image-receiving layer coating liquid) Titanium oxide (average particle size 0.3 μm, solid content 100%) 28.5 parts Styrene-isoprene-styrene copolymer (100% solids) 20.9 parts Polycarboxylic acid type dispersant (solid content 40%) 1.5 parts Toluol 49.1 parts Total 100.0 copies

[0051] Comparative Example 4 The transfer tape of Comparative Example 4 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a 12 μm thick PET (biaxially oriented polyethylene terephthalate) film and the white image-receiving layer coating liquid was changed to the following formulation. (White image-receiving layer coating liquid) Titanium oxide (average particle size 0.3 μm, solid content 100%) 44.0 parts Styrene-isoprene-styrene copolymer (100% solids) 5.4 parts Polycarboxylic acid type dispersant (solid content 40%) 1.5 parts Toluol 49.1 parts Total 100.0 copies

[0052] (Comparative Example 5) The transfer tape of Comparative Example 5 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a 12 μm thick PET (biaxially oriented polyethylene terephthalate) film and the white image-receiving layer coating liquid was changed to the following formulation. (White image-receiving layer coating liquid) Titanium oxide (average particle size 0.3 μm, solid content 100%) 37.5 parts Butadiene (100% solids) 11.9 parts Polycarboxylic acid type dispersant (solid content 40%) 1.5 parts Toluol 49.1 parts Total 100.0 copies

[0053] (Comparative Example 6) A transfer tape of Comparative Example 6 was obtained in the same manner as the transfer tape of Example 1, except that the substrate was changed to a PET (biaxially oriented polyethylene terephthalate) film having a thickness of 38 μm.

[0054] (Transfer spatula) We prepared a transfer spatula with the shape shown in Figure 2, with the tip of the spatula made of polyurethane elastomer with a Vickers hardness of 47HV. The pressing surface of the transfer tape was a rectangle of 1mm x 3mm, and the tip of the spatula was designed to be detachable from the hole in the main body of the transfer spatula shown in Figure 2, and was attached to the transfer spatula in a state where it protruded 5mm from the main body of the transfer spatula.

[0055] Each of the transfer tapes in the Examples and Comparative Examples was evaluated for the following characteristics: sharpness, image receptivity, and solvent resistance.

[0056] (Evaluation method) (Sharpness measurement) The separator of the transfer tape of each Example and Comparative Example was peeled off, and with the adhesive layer lightly in contact with the false nail, the tip of the transfer spatula was pressed against the false nail from the base side with a force of 1.5 N. The transfer layer (adhesive layer and white image-receiving layer) of the transfer tape was transferred to the false nail by moving the transfer spatula perpendicular to the 3 mm side of the tip of the transfer spatula and in the longitudinal direction of the false nail. The transfer spatula was moved over the false nail five times in the same area to transfer the transfer layer. The transfer spatula was also moved over the false nail to ensure that the transfer layer was transferred all the way to the edge of the false nail. After transfer, the base of the transfer tape was peeled off from the false nail, and the state of the transfer layer on the false nail was visually confirmed. To evaluate the sharpness, the transfer state of the entire false nail and the state of the transfer layer at the edge of the false nail were both checked. The transfer state of the entire false nail and the state of the transfer layer at the edge of the false nail were each evaluated according to the following evaluation criteria. The following commercially available artificial nails were used for evaluation. The transfer results were evaluated according to the following criteria. The evaluation results are shown in Table 1. False nails used for evaluation, manufacturer: YFFSFDC Material: ABS (acrylonitrile butadiene styrene) Size: 25mm x 15mm x 5mm Evaluation criteria for transfer condition on the entire surface of the artificial nail (The condition of the entire false nail was visually confirmed.) ◎: The transfer layer is transferred to the entire surface of the false nail without any lifting or chipping. ×: The transfer layer is lifted or chipped. Evaluation criteria for the condition of the transfer layer on the edge of the false nail The condition around the artificial nail was visually checked using a 10x magnification magnifying glass with a graduated scale (minimum graduation 0.1 mm). ⊚: There is some rattle at the end of the transfer layer on the edge of the false nail, but the rattle does not protrude by more than 0.1 mm. ◯: There is some wobbling at the end of the transfer layer of the false nail, with the amount of protrusion exceeding 0.1 mm, but the maximum amount of protrusion of the wobbling is 0.3 mm or less. x: The end of the transfer layer at the end of the false nail is loose and protrudes by more than 0.3 mm.

[0057] (Image reception evaluation) Using a nail printer (Koizumi Seiki Co., Ltd., PriNail KNP-N800 / P), a predetermined image was printed on the transfer layer of the artificial nail to which the transfer layer had been transferred from the transfer tape of each Example and Comparative Example under the following printing conditions and for the above-mentioned evaluation of sharpness. To confirm the evaluation of image receptivity, the state of printing (image reception) on the entire surface of the artificial nail was evaluated according to the following criteria. The evaluation results are shown in Table 1. Receptivity evaluation criteria ◎: The specified image is printed without any problems on the entire surface of the artificial nail. ◯: The specified image is printed on the entire surface of the artificial nail, but there are some areas where the print density is lighter than the specified image. ×: There is a part of the artificial nail where the predetermined image is not printed.

[0058] (Solvent resistance evaluation) In the image reception evaluation, artificial nails with a predetermined image printed on the surface of the transfer layer of each example or comparative example were used, and a top coat (Nail Holic SP012 manufactured by Kose Cosmetics Co., Ltd.) was applied to the entire surface of the print on each artificial nail. After the top coat dried, the surface condition of the artificial nail was visually inspected and visually inspected using a 10x magnification loupe, and evaluated according to the following evaluation criteria. The evaluation results are shown in Table 1. Solvent resistance evaluation criteria ◎: No cracks or other changes on the surface of the false nail to which the top coat was applied. ○: Fine cracks that can be seen under magnification with a magnifying glass have occurred on the surface of the false nail to which the top coat has been applied, but the cracks cannot be confirmed with the naked eye. ×: Visually observable cracks occurred on the surface of the false nail to which the top coat was applied.

[0059] (Table 1) TIFF0007827558000001.tif47170 [Explanation of symbols]

[0060] 10...Base material (transfer tape) 11...White image receiving layer (transfer tape) 12...Adhesive layer (transfer tape) A...Transfer tape B...Transfer spatula

Claims

1. A transfer tape for transferring a white image-receiving layer for an inkjet nail printer onto a nail, the transfer tape being laminated on a substrate with at least the white image-receiving layer and an adhesive layer laminated on the substrate in this order from the substrate side, the substrate being polyethylene terephthalate having a thickness of 5 μm to 26 μm, the white image-receiving layer containing a styrene copolymer as a binder in an amount of 14 wt% to 38 wt% of the solid content of the white image-receiving layer, and titanium oxide in an amount of 60 wt% to 85 wt% of the solid content of the white image-receiving layer, and the adhesive layer being in contact with the nail, the white image-receiving layer and the adhesive layer can be transferred from the substrate to the nail by pressing the transfer tape on the side opposite the adhesive layer with a transfer spatula whose main component is an elastomer.

2. 2. The transfer tape according to claim 1, wherein the styrene copolymer is a copolymer of at least one styrene selected from the group consisting of isoprene, butadiene, ethylene, and butylene.

3. 3. The transfer tape according to claim 1, wherein the thickness of the white image-receiving layer is 15 μm or more and 35 μm or less.

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