Skin design sheet

Abstract

Provided is a skin design sheet that suppresses peeling of a sealing portion during printing of a skin design image with a printer and reduces pain when peeling the sealing portion from the skin. A skin design sheet S comprises a release sheet 10 and a sealing portion 20. The release sheet 10 has a first base material 11 and a release layer 12 that are laminated in this order. The sealing portion 20 is provided on the release layer 12 so as to be peelable from the release sheet 10, and the sealing portion 20 has a laminated configuration in which an adhesive layer 21 and a second base material 22 are laminated in this order from the release sheet 10 side. The peeling force of the sealing portion 20 from the release sheet 10 is 0.07-5.0 N / 20 mm. The water contact angle of the surface of the release layer 12 exposed by peeling the sealing portion 20 from the release sheet 10 is 80-109°. The adhesive force of the adhesive layer 21 of the sealing portion 20 to an SUS plate is 1.0-10.0 N / 20 mm.

Description

Skin design sheet

[0001] The present disclosure relates to a skin-design sheet.

[0002] Tattoo stickers, body paint stickers, and other skin design sheets that are applied to the skin are becoming popular. These sheets, printed with various designs, are sold at variety stores, sporting and music event venues, amusement parks, etc., and are used to create a lively atmosphere.

[0003] Skin-design sheets are made by laminating a release sheet and a seal part, and are used by peeling the seal part from the release sheet and applying the adhesive layer of the seal part to the skin. Alternatively, the seal part may be half-cut, and a frame part of the desired shape surrounded by the half-cut may be peeled from the release sheet and applied to the skin. If the adhesive strength of the seal part (frame part) is high, it will cause strong pain when peeling the seal part from the skin, so it is necessary to reduce the adhesive strength.

[0004] The seal portion is required to be printed with a highly decorative image on demand. As mentioned above, if the adhesive strength of the seal portion is reduced, the seal portion (frame portion) peels off when printing the skin design image in a printer, causing problems such as poor printing and paper jams. Furthermore, even with a skin design sheet that has not been half-cut, there is a problem in that the leading edge of the seal peels off the release sheet for some reason while the skin design sheet is being transported in the printer, causing a paper jam.

[0005] Japanese Patent Application Laid-Open No. 2021-53962

[0006] The present disclosure aims to provide a skin design sheet that suppresses transport problems and sticker peeling when printing a skin design image with a printer, and that causes less pain when peeling the sticker portion from the skin.

[0007] [1] A skin-design sheet having a release sheet and a seal portion, wherein the release sheet has a first substrate and a release layer laminated in this order, and the seal portion is provided on the release layer so as to be peelable from the release sheet, and the seal portion has a laminated structure in which an adhesive layer and a second substrate are laminated in this order from the release sheet side, and the peel strength of the seal portion from the release sheet obtained by a test method in accordance with JIS K 6854-3:1999 (Adhesives - Peel adhesion strength test method - Part 3: T-peel) is 0.07 N / 20 mm or more and 5.0 N / 20 mm or less, and the surface of the release layer exposed by peeling the seal portion from the release sheet has a water contact angle of 80° or more and 109° or less by the sessile drop method in a wettability test in accordance with JIS R 3257:1999, and the adhesive layer of the seal portion is A skin design sheet having an adhesive strength to a SUS plate obtained by a test method conforming to Z0237:2022 of 1.0 N / 20 mm or more and 10.0 N / 20 mm or less.

[0008] [2] The skin design sheet according to [1], wherein the thickness of the first substrate of the release sheet is 10 μm or more and 200 μm or less, and the thickness of the release layer is 0.05 μm or more and 5 μm or less.

[0009] [3] The skin-design sheet according to [1] or [2], wherein the thickness of the adhesive layer is 5 μm or more and 50 μm or less, and the thickness of the second substrate is 5 μm or more and 150 μm or less.

[0010] [4] The surface portion of the skin design sheet on the second substrate side is a surface portion that can be printed by an on-demand printing method. [5] The skin design sheet according to any one of [1] to [3].

[0011] [5] The skin design sheet according to [4], wherein the on-demand printing method is at least one printing method selected from the group consisting of a thermal transfer method, an inkjet method, and an electrophotographic method.

[0012] [6] The skin design sheet according to [4], having a receiving layer printable by the on-demand printing method on the surface portion of the skin design sheet on the second substrate side.

[0013] [7] The skin design sheet according to any one of [1] to [6], wherein the seal portion is divided into a frame portion and a remaining portion by a half cut.

[0014] [8] The skin design sheet according to any one of [1] to [7], wherein a detection unit is formed on the release sheet, or the seal part, or both the release sheet and the seal part.

[0015] [9] The release sheet and either one of the seal portion, or the skin design sheet, measured from the seal portion side of the skin design sheet by a test method in accordance with JIS K5600-4-1 Method B, The skin design sheet according to any one of [1] to [8], wherein the hiding ratio (YB / YW) is 2.0% or more and 90% or less.

[0016]

[10] The concealment ratio (YB / YW) measured from the surface side opposite the release sheet of the sealed portion by a test method in accordance with Method B of JIS K5600-4-1 is 5% or more and 40% or less. [1] The skin design sheet according to any one of [9] to [9].

[0017]

[11] The seal portion has a stress-strain curve obtained by a tensile test (test piece width: 10 mm) in accordance with JIS-K 7127:1999, in which the 50% strain stress is 5 MPa or more and 160 MPa or less.

[12] The skin design sheet according to any one of [1] to

[10] .

[0018]

[12] The concealment ratio (YB / YW) measured from the surface side opposite the release sheet of the sealed portion by a test method in accordance with JIS K5600-4-1 Method B is 5% or more and 40% or less, and the concealment ratio (YB / YW) of the skin design sheet measured by a test method in accordance with JIS K5600-4-1 Method B is 30% or more and 99% or less. [1] The skin design sheet according to any one of [1] to

[11] .

[0019]

[13] The skin-design sheet according to any one of [1] to

[12] , wherein the second substrate is polyvinyl chloride (PVC) or polyurethane.

[0020]

[14] The bending resistance of the skin design sheet in the printer transport direction, measured by the Gurley method of the bending resistance test method in accordance with JIS L 1085:1998, is 300 mgf or more and 1200 mgf or less. [1] The skin design sheet according to any one of [1] to

[13] .

[0021]

[15] The surface of the first substrate opposite the release layer has an arithmetic mean height Sa measured in accordance with ISO 25178-2:2012 of 0.1 μm or more and 2.0 μm or less. [1] Any of [1] to

[14] . The skin design sheet described.

[0022]

[16] The surface of the first substrate facing the release layer has an arithmetic mean height Sa measured in accordance with ISO 25178-2:2012 of 0.01 μm or more and 0.30 μm or less. [1] Any of [1] to

[15] . The skin design sheet according to any of the above.

[0023] According to the present disclosure, it is possible to prevent transport problems and peeling of the sticker when printing a skin design image with a printer, and also to reduce pain when peeling the sticker from the skin.

[0024] Fig. 1 is a cross-sectional view of a skin design sheet. Fig. 2 is a cross-sectional view of a skin design sheet. Fig. 3 is a plan view of a skin design sheet. Fig. 4 is a cross-sectional view of a skin design sheet. Fig. 5 is a plan view of a skin design sheet. Fig. 6 is an enlarged plan view of a skin design sheet.

[0025] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings, etc. Note that the present disclosure can be implemented in many different forms, and should not be construed as being limited to the description of the embodiments exemplified below. Furthermore, to clarify the explanation, the drawings may show the width, thickness, etc. of each part more schematically than in the actual form, but these are merely examples and do not limit the interpretation of the present disclosure.

[0026] 1 is a cross-sectional view of a skin design sheet S according to an embodiment of the present disclosure. The skin design sheet S is formed by integrating a release sheet 10 and a seal portion 20, and the seal portion 20 is provided so as to be releasable from the release sheet 10. A desired image is formed on the surface portion 25 of the seal portion 20 (the surface opposite to the release sheet 10) by a printer. The printer is capable of on-demand printing, and uses a thermal transfer method, inkjet method, electrophotography method, etc.

[0027] The release sheet 10 has a laminated structure in which a release layer 12 is laminated on a first substrate 11 (release sheet substrate). The seal portion 20 has a laminated structure in which an adhesive layer 21 and a second substrate 22 (seal substrate) are laminated in this order from the release layer 12 side of the release sheet 10.

[0028] When the image formation method in the printer is sublimation transfer using a dye as a coloring material and the second substrate 22 does not contain a resin capable of dyeing the sublimation dye, a receiving layer 23 capable of receiving the dye may be provided on the second substrate 22 as shown in Fig. 2. That is, the sealing portion 20 may have a layered configuration in which the adhesive layer 21, the second substrate 22, and the receiving layer 23 are layered in this order from the release sheet 10 side.

[0029] In addition, a back surface layer 13 may be provided on the back surface of the first substrate 11 (the surface opposite to the sealing portion 20) to control the transportability and chargeability of the skin design sheet S within the printer.

[0030] Here, the skin design sheet S is a sheet (sticker) to be attached to human skin, and examples thereof include body paint stickers, tattoo stickers, and nail stickers.

[0031] This skin design sheet S is a seal-type thermal transfer image receiving sheet consisting of a release sheet, an adhesive layer, and a base sheet, and it is necessary to establish performance that is flexible and does not cause pain when peeled off from human skin, and also ensures smooth running due to the complex printing mechanism.

[0032] The skin design sheet S also includes a sheet before an image is formed on the surface portion 25 of the seal portion 20.

[0033] Each component of the skin design sheet S will be specifically described below.

[0034] <Release Sheet> (Substrate) Examples of the first substrate 11 (release sheet substrate) of the release sheet 10 include polyesters such as polyethylene terephthalate and polyethylene naphthalate, stretched or unstretched plastic substrates such as polypropylene, polycarbonate, cellulose acetate resin, polyethylene derivatives, polyamide, and polymethylpentene, as well as paper substrates such as fine paper, coated paper, resin-coated paper, art paper, cast-coated paper, paperboard, emulsion-impregnated paper, synthetic rubber latex-impregnated paper, synthetic resin-loaded paper, and cellulose fiber paper. Polylaminated base paper, which is glassine paper or pigment-coated paper laminated with polyethylene or the like, and synthetic paper containing polypropylene or the like as a main component, can also be used as the first substrate 11.

[0035] A layer having microvoids therein can also be used as the first substrate 11. An example of a layer having microvoids therein is a polyolefin resin layer having microvoids therein. Examples of polyolefin resins include polyethylene, polypropylene, polybutene, polyisobutene, polyisobutylene, polybutadiene, polyisoprene, and ethylene-vinyl acetate copolymer. Also usable are highly heat-resistant polyester void films such as polyethylene terephthalate and polyethylene naphthalate.

[0036] The thickness of the first substrate 11 may be determined taking into consideration the overall thickness of the skin design sheet S and the overall thickness of the release sheet 10. The thickness is determined taking into consideration the printer specifications for printing on the skin design sheet and the feeling of adhesion to human skin when applied to human skin. When emphasis is placed on the feeling of adhesion to human skin, it is advisable to make the seal portion 20 thin. On the other hand, to satisfy the printer specifications, it is advisable to make the first substrate 11 thick. For example, the overall thickness of the release sheet 10 is 10 μm or more and 200 μm or less, and the thickness of the first substrate 11 is 10 μm or more and 200 μm or less.

[0037] When the thickness of the first substrate 11 is less than 10 μm, the seal substrate 22 must be thick to ensure printability, which makes the seal stiff when applied to human skin. Conversely, when the thickness of the first substrate 11 is greater than 200 μm, the seal substrate 22 must be thin to meet the print specifications (printer thickness limits), which makes the seal more susceptible to problems such as peeling at the leading edge during transport within the printer. This is thought to be due to the seal portion having low rigidity when slightly caught on mechanical irregularities or small burrs during transport within the printer.

[0038] The first substrate 11 preferably has an arithmetic mean height Sa of 0.01 μm or more and 0.30 μm or less on the surface on the seal portion 20 side, measured in accordance with ISO 25178-2:2012. A first substrate 11 having a surface roughness within the above range enables high-resolution printing using multiple colors when printing on the skin-design sheet S using a printer, resulting in a more natural appearance and superior pattern expression. Such a first substrate 11 is preferably a resin film, and more preferably a PET film. It is easy to adjust the surface roughness of the surface on the seal portion 20 side to a preferred range.

[0039] In the present disclosure, the arithmetic mean height Sa represents the average of the absolute values ​​of the differences in height at each point relative to the average plane of the surface, and is a parameter that serves as an index of surface roughness.

[0040] (Release Layer) The release layer 12 provided on the surface of the first substrate 11 of the release sheet 10 adjusts the peel strength between the release sheet 10 and the adhesive layer 21 .

[0041] Examples of release resins that form the release layer 12 include silicone resins, silicone-modified resins, polyethylene wax, amide wax, waxes, silicone wax, fluororesins, fluororesin-modified resins, polyvinyl alcohol, acrylic resins, thermally crosslinkable epoxy-amino resins, and thermally crosslinkable alkyd-amino resins. The release layer may be made of one type of resin, or two or more types of resins. The release layer 12 may be formed using a crosslinking agent such as an isocyanate compound, a catalyst such as a tin-based catalyst, or an aluminum-based catalyst in addition to the release resin.

[0042] Examples of release agents include phosphate ester surfactants, various modified silicone oils such as silicone oil, reactive silicone oil, and cured silicone oil, as well as various silicone resins. These release agents can be added to, for example, (meth)acrylic resins, polyolefins, styrene resins, vinyl resins such as ethylene-vinyl acetate copolymers and vinyl chloride-vinyl acetate copolymers, polyesters, polyamides, imide resins, cellulose resins, polyol resins, polycarbonates, and ionomer resins. They can also be used in combination with one or more of the above-mentioned release resins, such as silicone resins.

[0043] As the release agent for the release sheet of the present disclosure, reactive silicone release agents are used alone or in combination. As the reactive silicone, various types of reactive silicones can be used, such as solvent-added type, solventless-added type, emulsion-added type, and solventless UV-cured type, and these reactive silicones can also be used in combination with other release resins, release agents, or resins that do not have significant release properties by themselves.

[0044] Representative examples of solventless addition type silicones, which are reactive silicones, include products manufactured by Shin-Etsu Chemical Co., Ltd., such as KNS-3051, KNS-320A, KNS-316, KNS-3002, KNS-3300, and X-62-1387. Reactive silicones also include solvent addition type silicones. Examples include KS-847, KS-847T, KS-776L, KS-776L, KS-3703T, KS-3601, KS-830E, and X-62-2825. These reactive silicones can also be used in combination with other release resins, release agents, and other resins.

[0045] In the present disclosure, the objective was achieved by forming a release layer using a mixture of this addition type silicone and a resin that does not exhibit significant releasability on its own, thereby adjusting the contact angle of the surface and further adjusting the peel strength with the adhesive.

[0046] Examples of curable silicones that can be used include radical addition silicones that cure by the reaction between a mercapto group and a vinyl group, hydrosilylation reaction silicones, acrylic radical polymerization silicones, and epoxy group-containing cationic polymerization silicones. Furthermore, it is also possible to use specific release UV-curable inks that contain release radiation-curable polydimethylsiloxanes. Compared to heat-curable inks that contain heat-curable polydimethylsiloxanes, UV-curable inks have the advantage of shortening the time required for a thermal drying oven or eliminating the need for one.

[0047] The release layer may contain various additives. Examples of additives include fillers, plasticizers, antistatic agents, ultraviolet absorbers, and dispersants. Colorants, white pigments, and the like can also be added as needed.

[0048] The thickness of the release layer 12 is preferably 0.05 μm or more, more preferably 0.1 μm or more, and even more preferably 0.3 μm or more. The thickness of the release layer 12 is preferably 5 μm or less, more preferably 3 μm or less, and even more preferably 2 μm or less. The thickness of the release layer has a relatively small effect on release performance, but if the thickness is too thin, the release performance may deteriorate or become unstable. Conversely, if the thickness is too thick, the cost may increase.

[0049] The release layer can be formed, for example, by dispersing or dissolving the components described above in a suitable solvent to prepare a coating liquid, which is then applied by a known coating method, such as gravure printing, screen printing, or reverse coating using a gravure plate, and then dried. The release layer may also be formed by extruding a resin having release properties.

[0050] The water contact angle on the surface of the release layer 12 is 80° or more and 109° or less, preferably 90° or more and 108° or less, and more preferably 96° or more and 107° or less. When the water contact angle is less than 80°, the peel force between the release layer 12 and the adhesive layer 21 increases, making it difficult to peel the seal portion 20 from the release sheet 10. Conversely, when the water contact angle exceeds 109°, the seal portion 20 peels easily from the release sheet 10, which makes it more likely that transport problems will occur, such as leading edge peeling, jamming, and frame peeling, when transported to a printer.

[0051] The water contact angle may be measured using a commercially available contact angle measuring device by the wettability test method (sessile drop method) in accordance with JIS R 3257:1999. The water contact angle can be measured under the following conditions. Measurements are performed five times, and the average value is used. [Water contact angle measurement conditions] Measurement device: Contact angle measuring device DropMaster DM700 (manufactured by Kyowa Interface Science Co., Ltd.) Measurement atmosphere: 23°C, 50% RH Measurement liquid: Distilled water Water drop volume: 2 μL Measurement time: 1500 ms after droplet landing

[0052] (Backside Layer) A backside layer 13 can be provided on the backside of the first substrate 11 of the release sheet 10. For example, a coating liquid containing particles of organic fillers such as nylon fillers, acrylic fillers, polyamide fillers, fluorine-based fillers, polyethylene wax, and amino acid-based powders, inorganic fillers such as silicon dioxide and metal oxides, and other necessary additives such as colorants and antistatic agents dissolved or dispersed in an organic solvent or water is applied to the backside of the first substrate 11 and dried to form the backside layer 13. Forming such a backside layer 13 creates irregularities on the backside of the release sheet 10, improving the transportability of the skin design sheet S, particularly the compatibility of multicolor prints, and the suitability of the manufacturing process when producing skin design sticker products. The particle size is preferably an average particle size of 0.1 μm or more and 10 μm or less. By forming a backing layer composition in which particles having such a particle size are added in an amount of 0.1 part by weight to 10 parts by weight based on the resin, the desired transportability can be achieved.

[0053] The thickness of the back surface layer 13 is not particularly limited, but is preferably 0.5 μm or more and 5 μm or less in a dry state. The arithmetic mean height Sa of the surface irregularities measured in accordance with ISO 25178-2:2012 using the following method is 0.1 μm or more and 2.0 μm or less. (Evaluation method) Measurements are performed using a three-dimensional surface roughness profiler Surfcom 570A-3DF (manufactured by Tokyo Seimitsu) under the following conditions. (Measurement conditions) (Length) X: 5.000 mm, Y: 5.000 mm (Size) X: 2048 points, Y: 202 points (Spacing) X: 2443 μm, Y: 24.88 μm

[0054] If the back surface of the first substrate 11 has an uneven shape, the process of preparing the back surface layer 13 by coating or the like may be omitted. For example, when forming the first substrate 11 into a sheet by a method such as EC extrusion or calendaring, the necessary unevenness may be formed by roughening the surface of a chill roll. For example, a chill roll having a surface roughness (Rmax) of 0.1 μm or more and 35 μm or less can be used to prepare a first substrate with an appropriately roughened surface. Furthermore, an antistatic treatment may be performed as necessary.

[0055] When an uneven shape is provided on the back surface of the first substrate 11, the optical characteristics of the substrate change, and the transparency, which is quantified by physical properties such as gloss value, haze, and transmittance, changes. For example, when an uneven shape is provided on a highly transparent substrate, the transparency of the substrate decreases. The transparency of the substrate can be expressed by the transmittance of visible light with a wavelength of 500 nm.

[0056] When this transmittance is 80% or more, the substrate is considered to be "transparent," and conversely, when this transmittance is less than 80%, the substrate is considered to be "semi-transparent to opaque." However, in this disclosure, "semi-transparent" means that the hiding ratio (YB / YW) obtained by a test method in accordance with JIS K5600-4-1 Method B is 2.0% or more and 90% or less. The hiding ratio of the release sheet in this disclosure is a value measured from the release layer side. In the case of a skin-design sheet, the value is measured from the release layer side of the "release sheet" from which the seal portion has been peeled.

[0057] (White Printed Layer) The skin design sheet of the present disclosure may have a white printed layer on the side opposite the seal portion of the release sheet. That is, the skin design sheet may have a white printed layer, a release sheet, and a seal portion in this order in the thickness direction.

[0058] The white printed layer may be a white primer layer containing a white pigment and a resin material.

[0059] Examples of white pigments include silica, titanium oxide, titanium dioxide, zinc oxide, cerium oxide, titanium mica, muscovite, white carbon, calcium carbonate, barium sulfate, alumina white, and talc. Among these, titanium oxide is preferred from the viewpoint of whiteness. The white printed layer can contain one or more white pigments.

[0060] The content of the white pigment in the white printed layer is preferably 40% by mass or more and 85% by mass or less, more preferably 50% by mass or more and 80% by mass or less. Increasing the content of the white pigment in the white printed layer can increase the hiding rate of the skin design sheet. On the other hand, decreasing the content of the white pigment in the white printed layer can decrease the hiding rate of the skin design sheet.

[0061] The white print layer may further contain a pearl pigment, examples of which include oxide-coated mica such as iron oxide-coated mica titanium, iron oxide-coated mica titanium, chromium oxide-coated mica titanium, carmine-coated mica titanium, organic pigment-coated mica titanium, titanium oxide-coated mica, and titanium oxide-coated synthetic mica, as well as fish scale powder, shell fragments, and pearl fragments.

[0062] Examples of resin materials include (meth)acrylic resins, polyolefins, styrene resins, vinyl resins such as ethylene-vinyl acetate copolymers and vinyl chloride-vinyl acetate copolymers, polyesters, polyamides, imide resins, cellulose resins, polyol resins, polycarbonates, and ionomer resins. The white print layer can contain one or more resin materials.

[0063] The white printing layer preferably contains either one or both of a (meth)acrylic resin and a polyol resin as the main resin material. This improves the dispersion stability of the white pigment in the coating liquid for forming the white printing layer and suppresses the occurrence of coating defects, etc. The main resin material refers to a resin material that accounts for 70 parts by mass or more per 100 parts by mass of the total amount of resin materials contained in the white printing layer.

[0064] From the viewpoint of improving adhesion to the release sheet, the white printed layer preferably contains a vinyl resin, more preferably a vinyl chloride-vinyl acetate copolymer. The vinyl resin content in the white printed layer is preferably 0.3% by mass or more and 10% by mass or less, more preferably 0.5% by mass or more and 5% by mass or less. This further improves the adhesion of the white printed layer to the release sheet.

[0065] From the viewpoint of improving adhesion to the release sheet, the white printed layer preferably contains polyester. The content of polyester in the white printed layer is preferably 0.03% by mass or more and 1% by mass or less, more preferably 0.1% by mass or more and 1% by mass or less. This further improves adhesion to the release sheet.

[0066] The content of the resin material in the white print layer is preferably 10% by mass or more and 70% by mass or less, more preferably 10% by mass or more and 50% by mass or less, which can prevent re-aggregation of the white pigment and achieve high hiding power.

[0067] The white print layer may contain additives. Examples of additives include fillers, plasticizers, antistatic agents, UV absorbers, release agents, and dispersants. The white print layer can contain one or more additives.

[0068] The thickness of the white printed layer is preferably 0.6 μm or more, more preferably 0.8 μm or more, and even more preferably 1.0 μm or more. The thickness of the white printed layer is preferably 6 μm or less, more preferably 5 μm or less, and even more preferably 4 μm or less. Increasing the thickness of the white printed layer can increase the hiding ratio of the laminate sheet described below. On the other hand, decreasing the thickness of the white printed layer can decrease the hiding ratio of the laminate sheet described below.

[0069] The white printed layer can be formed, for example, by dispersing or dissolving the above components in an appropriate solvent to prepare a coating liquid, which is then applied to the surface of the release sheet by a known coating method, and then dried.

[0070] <Sealing portion> The sealing portion 20 has a laminated structure in which an adhesive layer 21 and a second substrate 22 are laminated in this order from the release sheet 10 side. In the skin design sheet S of the present disclosure, the peel strength of the sealing portion 20 (adhesive layer 21) from the release sheet 10 (release layer 12) is preferably 0.07 N / 20 mm or more and 5.0 N / 20 mm or less, more preferably 0.3 N / 20 mm or more and 3.0 N / 20 mm or less, and even more preferably 0.5 N / 20 mm or more and 2.5 N / 20 mm or less.

[0071] When the peeling force is 0.07 N / 20 mm or more, peeling of the seal portion 20 from the release sheet 10 can be suppressed during printing processing in the printer.

[0072] Furthermore, by having a peeling force of 5.0 N / 20 mm or less, when a customer peels the seal portion 20 from the release sheet 10 with his / her fingers, the peeling is not too difficult and the seal portion 20 can be peeled off smoothly.

[0073] The peeling force can be adjusted appropriately depending on, for example, the physical properties of the release layer 12 .

[0074] The peel strength was measured using a peeling device (a small tabletop tester (EZ Test series, manufactured by Shimadzu Corporation)) in accordance with JIS K 6854-3:1999 (Adhesives - Test method for peel adhesion strength - Part 3: T-peel).

[0075] In the seal portion 20 of the present disclosure, the adhesive strength of the adhesive layer 21 to a SUS plate is preferably 1.0 N / 20 mm or more and 10.0 N / 20 mm or less, and more preferably 5.0 N / 20 mm or more and 9.0 N / 20 mm or less. When the adhesive strength to a SUS plate is in the above range, the pain when peeling off the seal portion 20 that has been stuck to human skin is alleviated, and peeling of the seal portion 20 from the release sheet 10 during printing processing in a printer can be suppressed.

[0076] Here, the adhesive strength to SUS plate can be measured in accordance with Method 1 of the test method of JIS Z0237:2022 (Test Methods for Pressure-Sensitive Adhesive Tapes and Sheets) (a test method in which the tape or sheet is peeled off at 180° from the stainless steel test plate at a temperature of 23°C and humidity of 50%) by peeling the test piece in the longitudinal direction under the conditions of a width of 25 mm, a peel angle of 180°, and a peel speed of 300 mm / min. The SUS plate can be SUS304, surface finish BA, thickness 1.5 mm, and size 100 mm x 150 mm.

[0077] (Adhesive Layer) It is preferable to use a urethane-based or acrylic-based adhesive that is less likely to cause rashes or inflammation on the skin for the adhesive layer 21 of the sealing portion 20. Furthermore, a gel-type adhesive is preferable to ensure adhesion to the skin.

[0078] Examples of adhesive materials include acrylic adhesives, natural rubber adhesives, synthetic rubber adhesives, and urethane adhesives, among which acrylic adhesives are preferred because they have excellent weather resistance and their adhesive strength and peel strength can be relatively easily adjusted by changing the monomer composition, surfactant, etc. The acrylic adhesive is not particularly limited, but examples include those containing ethyl acrylate (EA), butyl acrylate (BA), and 2-ethylhexyl acrylate (2-EHA) as main monomers and vinyl acetate (VAc), acrylonitrile (AN), styrene (St), methyl methacrylate (MMA), acrylic acid (AA), itaconic acid (IA), hydroxyethyl methacrylate (HEMA), hydroxypropyl methacrylate (HPMA), dimethylaminoethyl methacrylate (DM), acrylamide (AM), methylol acrylamide (N-MAN), glycidyl methacrylate (GMA), maleic anhydride, etc. as main components (preferably 80% by mass or more). In addition, if the resin system contained in the release layer and the resin system contained in the adhesive are, for example, the same natural rubber-based adhesive or synthetic rubber-based adhesive, the peel strength will be extremely high, so it is recommended to adjust the material composition of each layer appropriately to adjust the required peel strength. For resin systems, the solubility parameter (SP value) can be used as an indicator. That is, by adding materials with similar SP values ​​to each layer, the peel strength can be increased, and conversely, by using materials with different SP values, the peel strength can be decreased.

[0079] Furthermore, the adhesive may contain various additives such as a tackifier, an ultraviolet absorber, a crosslinking agent, a softener, a pigment, an antioxidant, etc. The adhesive may be prepared using the above-mentioned raw materials according to a conventional method.

[0080] The thickness of the adhesive layer is, for example, 5 μm or more and 50 μm or less, and more preferably 10 μm or more and 20 μm or less. If the thickness of the adhesive layer is less than 5 μm, the adhesive strength may be reduced due to the influence of the surface properties of the substrate, and the adhesive may peel off during printing or may peel off unintentionally when applied to human skin. If the adhesive layer is thicker than 50 μm, the adhesive may overflow from the edge, resulting in poor manufacturing suitability and poor printing workability. For example, the tip may curl up during printing or the sheet cutting suitability may deteriorate.

[0081] The method for applying the adhesive is not particularly limited, but examples thereof include a comma coating method, a reverse coating method, a gravure coating method, a reverse gravure coating method, a kiss coating method, a knife coating method, a bar coating method, and a transfer method in which a coating applied by any of these methods is transferred onto a casting paper.

[0082] (Substrate) The second substrate 22 (seal substrate) of the seal portion 20 is a stretchable sheet having an elongation percentage obtained by a test method conforming to JIS-K-7127:1999 of preferably 10% or more and 10,000% or less, more preferably 100% or more and 1,000% or less, and even more preferably 150% or more and 400% or less.

[0083] The elongation measured by the test method conforming to JIS-K-7127:1999 was measured by using a tensile tester to pull the test object at a speed of 200 mm / min until the test object broke (fractured), and was calculated by the following formula (1): Elongation (%) = 100 x (L - L0) / L0 (1) (L is the length of the test object at the time of fracture, and L0 is the length of the test object before the test).

[0084] As the tensile tester, for example, a small tabletop tester (EZ Test series, manufactured by Shimadzu Corporation), a Tensilon universal material testing machine, or the like can be used.

[0085] Known examples of substrates having such elongation include polyester film (PET) as a substrate having an elongation of approximately 50% to 200%, polypropylene as a substrate having an elongation of approximately 100% to 600%, soft polyvinyl chloride (PVC) as a substrate having an elongation of approximately 150% to 500%, high-density polyethylene as a substrate having an elongation of approximately 10% to 300%, medium-density polyethylene as a substrate having an elongation of approximately 100% to 700%, low-density polyethylene as a substrate having an elongation of approximately 100% to 1000%, and polyurethane as a substrate having an elongation of approximately 100% to 10,000%.

[0086] These materials can be used alone or in combination of two or more types, and by including pigments and other additives in addition to the resin materials not exemplified here and adjusting the elongation percentage of the base sheet to fall within this range, it is possible to produce a sheet that meets the objectives of the present disclosure.

[0087] The second substrate 22 can be made of a urethane film, a polyvinyl chloride film, a polyester film, or the like. The thickness of the second substrate 22 is preferably 5 μm or more and 150 μm or less, and more preferably 10 μm or more and 100 μm or less. A thickness of 5 μm or more can suppress the occurrence of wrinkles during application and improve workability. A thickness of 150 μm or less can suppress a sense of incongruity during application. When the image formation method in the printer is melt transfer using a pigment as a colorant, the pigment is transferred to the second substrate 22 to form the desired image. It is advisable to appropriately adjust the adhesiveness and thermal fixability of the resin constituting the pigment colorant and the resin constituting the second substrate 22.

[0088] Furthermore, if the image formation method used in the printer is sublimation transfer using dye as the coloring material, if the second substrate 22 contains a resin capable of dyeing the sublimation dye, the dye is transferred to the second substrate 22 and the desired image is formed.

[0089] The resin capable of adsorbing the sublimation dye contained in the second substrate 22 is not particularly limited, and examples thereof include polyolefin resins such as polypropylene, halogenated resins such as polyvinyl chloride (PVC) or polyvinylidene chloride, vinyl resins such as polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, or polyacrylic ester, polyester resins such as polyethylene terephthalate or polybutylene terephthalate, polystyrene resins, polyamide resins, copolymers of olefins such as ethylene or propylene with other vinyl polymers, cellulose resins such as ionomers or cellulose diastase, polycarbonate, acrylic resins, polyurethane, polyamide, polyimide, and styrene resins. The second substrate 22 may contain one type of resin capable of adsorbing the sublimation dye alone, or two or more types. Furthermore, the second substrate 22 may contain a resin capable of adsorbing the sublimation dye and a resin that is not capable of adsorbing the sublimation dye.

[0090] Among these, the second substrate 22 preferably contains polyvinyl chloride (PVC) resin, urethane resin, polyethylene resin, polyester resin, acrylic resin, or cellulose resin as a resin capable of adsorbing sublimation dyes, and more preferably contains polyvinyl chloride (PVC) resin, urethane resin, or polyethylene resin. These resins have high dye adsorption properties among resins capable of adsorbing sublimation dyes. Among these, polyvinyl chloride (PVC) resin has high dye adsorption properties.

[0091] The second substrate 22 may contain, in addition to the resin capable of dyeing the sublimation dye, a plasticizer for adjusting the elongation percentage of the second substrate 22 within the above range. By including a plasticizer in the second substrate 22, the elongation percentage of the second substrate 22 can be easily adjusted to a desired range.

[0092] Examples of the plasticizer that may be added include phthalate ester compounds, sebacate ester compounds, and phosphate ester compounds. Phthalate esters such as DBP (dibutyl phthalate), DOP (di-2-ethylhexyl phthalate, DEHP), n-DOP (dioctyl phthalate), BLP (butyl lauryl phthalate), DLP (dilauryl phthalate), and BBP (butyl benzyl phthalate) are known, but are subject to regulation due to concerns about their role as endocrine disruptors. Therefore, diethyl phthalate, dipropyl phthalate, and di-n-heptyl phthalate, which are not subject to such regulation, are preferred.

[0093] In addition, adipic acid derivatives such as DOA (dioctyl adipate), azelaic acid derivatives such as DOZ (dioctyl azelate), sebacic acid derivatives such as DOS (dioctyl sebacate), phosphate esters such as TCP (tricresyl phosphate), TXP (trixylenyl phosphate), Santicizer 141 (monoctyl diphenyl phosphate), B-2-X (monobutyl dixylenyl phosphate), and TOF (trioctyl phosphate), methyl acetyl ricinoleate, and methyl cellosolve ricinoleate. Examples of suitable plasticizers include castor oil derivatives such as Paraplex G-60, Paraplex G-62, and Monoplex S-71, epoxidized vegetable oils such as Paraplex G-60, Paraplex G-62, and Monoplex S-71, tri- or tetraethylene glycol esters of C6 to C10 fatty acids, ethylene glycol derivatives such as butylphthalyl butyl glycolate, polyester-based plasticizers such as Paraplex G-25 and Paraplez G-50, chlorinated compounds such as chlorinated paraffin and pentachlorobutyl stearate, petroleum-based auxiliary plasticizers such as Savaloid C and Dutrex 25, and nitrile-based synthetic rubbers such as NBR. The second substrate 22 may contain one type of plasticizer, or may contain two or more types of plasticizers.

[0094] There is no particular limitation on the content of the plasticizer, and it may be set appropriately depending on the type of resin capable of dyeing the sublimation dye contained in the second base material 22. For example, the content ratio thereof is preferably 20 parts by mass or more and 100 parts by mass or less, more preferably 30 parts by mass or more and 80 parts by mass or less, per 100 parts by mass of the resin material.

[0095] The second substrate 22 preferably has an elongation rate of 100% or more, and even 250% or more. For example, in the case of a PVC sheet, a substrate sheet with such an elongation rate can be adjusted to a moderate elongation rate by internal plasticization through copolymerization with vinyl acetate or copolymerization with acrylic resin, or external plasticization with various additives. For example, the elongation rate can be adjusted by adjusting the amount of dioctyl phthalate, a plasticizer. In the case of a standard PVC sheet, when the amount of dioctyl phthalate is 10 parts or 30 parts per 100 parts of PVC, the elongation rate of the PVC sheet can be 200% or 300%.

[0096] By positioning the second substrate 22 on the outermost surface of the sealing portion 20, a thermal transfer image can be formed on the surface of the second substrate 22 by a sublimation thermal transfer method without providing any other layer for receiving the sublimation dye, such as a receiving layer.

[0097] The second substrate 22 may contain, in addition to resins other than those exemplified above and plasticizers added as needed, additives such as stabilizers, titanium oxide, silica, and pigments for coloring.

[0098] When the release sheet 10 is translucent to opaque, the second substrate 22 may be transparent. On the other hand, when the release sheet 10 is transparent, the second substrate 22 is preferably translucent to opaque. Here, "semitransparent" means that the hiding ratio (YB / YW) obtained by a test method conforming to Method B of JIS K5600-4-1 (Hiding power: for light color paints) is 2.0% or more and 90% or less. Opaque (e.g., white) means that (YB / YW) is 90% or more and 100% or less. Conversely, transparent means that (YB / YW) is 0% or more and 2.0% or less. Specifically, the film is attached to a hiding ratio test paper (AS ONE 1-3783-01), and the tristimulus values ​​YB (the Y value of the film attached to the black portion) and YW (the Y value of the film attached to the white portion) are measured and calculated.

[0099] The hiding power of the second substrate 22 in the present disclosure is a value measured from the side to be dyed (the side of the second substrate 22, not the adhesive layer). In the case of a skin-design sheet, the release sheet has already been peeled off from the "second substrate 22 + adhesive layer 21," and the "concealment power evaluation sample" is obtained by attaching the "second substrate 22 + adhesive layer 21" to the above-mentioned hiding power test paper (AS ONE 1-3783-01) without introducing any air bubbles. This value is measured from the side to be dyed (the side of the second substrate 22, not the adhesive layer). Even when a primer and a receiving layer are formed on the upper surface of the second substrate, the value is measured from the side to be dyed (the side of the second substrate 22, not the adhesive layer).

[0100] There are no particular limitations on the method for forming the second substrate 22, but the second substrate 22 can be formed by mixing the resins exemplified above, a plasticizer added as needed, and any additives in any ratio so that the elongation of the formed second substrate 22 has a desired value, and then performing thermal processing such as EC processing or calendaring. Alternatively, instead of thermal processing, the second substrate 22 can be formed by dispersing or dissolving the resins exemplified above, a plasticizer added as needed, and any additives in an appropriate solvent, and applying and drying the resulting coating liquid onto the adhesive layer 21 or any layer provided on the adhesive layer 21.

[0101] The content of the resin material in the second substrate 22 is preferably 60% by mass or more and 100% by mass or less, and more preferably 70% by mass or more and 100% by mass or less. Here, increasing the content of the resin material in the second substrate 22 can increase the 50% strain stress in the stress-strain curve obtained by a tensile test of the sealed portion, as described below. On the other hand, decreasing the content of the resin material in the second substrate 22 can decrease the 50% strain stress in the stress-strain curve obtained by a tensile test of the sealed portion.

[0102] The second substrate 22 may contain a white pigment. Examples of white pigments include silica, titanium oxide, titanium dioxide, zinc oxide, cerium oxide, titanium mica, muscovite, white carbon, calcium carbonate, barium sulfate, alumina white, and talc. Among these, titanium oxide is preferred from the viewpoint of whiteness. The second substrate 22 may contain one or more types of white pigments.

[0103] The second substrate 22 may further contain a pearl pigment. Examples of the pearl pigment include oxide-coated mica such as iron oxide-coated mica titanium, iron oxide-coated mica titanium, chromium oxide-coated mica titanium, carmine-coated mica titanium, organic pigment-coated mica titanium, titanium oxide-coated mica, and titanium oxide-coated synthetic mica, as well as fish scale powder, shell fragments, and pearl fragments.

[0104] The pearl pigment is not particularly limited, and pearl pigments other than those mentioned above may be used. Furthermore, the pearl pigment may be any of the above-mentioned pearl pigments whose surfaces are coated with a colored pigment.

[0105] The shape of the pearl pigment is not particularly limited, but plate-like or scale-like pigments are preferred. A pearl pigment of this shape can be arranged in a component containing the pearl pigment substantially parallel to the surface of the component, and can impart a high pearlescent effect due to the action of multiple light reflection.

[0106] The content of the white pigment in the second substrate 22 is preferably 0.05% by mass or more and 10% by mass or less, more preferably 0.1% by mass or more and 5.0% by mass or less. Here, increasing the content of the white pigment in the second substrate 22 can increase the 50% strain stress in the stress-strain curve obtained by a tensile test of the sealed portion, as described below. On the other hand, decreasing the content of the white pigment in the concealing layer can decrease the 50% strain stress in the stress-strain curve obtained by a tensile test of the sealed portion.

[0107] The thickness of the second substrate 22 is preferably 20 μm or more, more preferably 30 μm or more. A skin design sheet having a second substrate 22 with a thickness of 20 μm or more can, for example, suppress the occurrence of wrinkles when the sheet portion is attached. Furthermore, a skin design sheet having a second substrate 22 with a thickness of 30 μm or more can easily peel off and attach the release sheet from the skin design sheet without the seal portion becoming distorted, thereby improving workability.

[0108] The thickness of the second substrate 22 is preferably 150 μm or less, and more preferably 100 μm or less. As will be described later, a seal portion including such a second substrate 22 can easily adjust the 50% strain stress in a stress-strain curve obtained by a tensile test of the seal portion.

[0109] Furthermore, the skin design sheet of the present disclosure has a 50% strain stress of 5 MPa or more and 160 MPa or less in a stress-strain curve obtained by a tensile test in accordance with JIS-K 7127:1999 using a 10 mm wide test piece as the seal portion. If the 50% strain stress is within the above range, the seal portion stretches appropriately when applied to the skin, providing an excellent feeling of adhesion when applied to the skin. Furthermore, when printing on the skin design sheet, the sheet's stretching can be suppressed, resulting in excellent pattern expression.

[0110] In the present disclosure, the total thickness of the sealed portion is preferably 20 μm or more, more preferably 30 μm or more, and preferably 150 μm or less, more preferably 100 μm or less. The total thickness of the sealed portion is, for example, 20 μm or more and 150 μm or less. When the total thickness of the sealed portion is within the above range, the 50% strain stress in the stress-strain curve obtained by a tensile test of the sealed portion is likely to satisfy the above-mentioned requirements.

[0111] When produced by thermal processing, the second substrate 22 may be formed as a single sheet, or may be formed together with another support (process release sheet) not directly exemplified in Figures 1 and 2, and then the second substrate 22 alone may be peeled off to form the seal portion second substrate 22. When produced by coating processing, the second substrate 22 may be formed on another support (process release sheet) not directly exemplified in Figures 1 and 2 by coating and drying, and then the seal portion second substrate 22 may be formed on the process release sheet, and then the second substrate 22 alone may be peeled off to form the seal portion second substrate 22.

[0112] The skin design sheet S used in one embodiment of the image forming method can also have an optional layer between the adhesive layer 21 and the second substrate 22 or on the second substrate 22 to enhance the decorativeness of the sealing portion 20 or to impart a specified function to the sealing portion 20.

[0113] Although it is not excluded that an optional layer may be provided on the second substrate 22, as described above, the second substrate 22 can be located on the outermost surface of the skin design sheet S.

[0114] (Receptor Layer) When the image formation method in a printer (thermal transfer printer) is sublimation transfer using a dye as a colorant, instead of incorporating a resin capable of dyeing the sublimation dye into the second substrate 22, a dye-receptor layer 23 capable of receiving the dye may be provided on the second substrate 22. The components of the receptor layer are not particularly limited, and examples include polyolefins such as polypropylene, halogenated resins such as polyvinyl chloride or polyvinylidene chloride, vinyl resins such as polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, or polyacrylic ester, polyesters such as polyethylene terephthalate or polybutylene terephthalate, copolymers of polyolefins such as ethylene or propylene with other vinyl polymers, cellulose resins such as ionomers or cellulose diacetate, and solvent-based resins such as polycarbonate, polystyrene, polyamide, and acrylic resin. These materials may be used alone or in combination of two or more. The thickness of the receptor layer is not particularly limited, but is preferably 0.5 μm to 10 μm, and more preferably 2 μm to 6 μm.

[0115] A release agent is preferably added to the receiving layer to reduce thermal adhesion between the ink ribbon and the surface-design sheet during printing. Various conventional silicone oils can be used as the release agent, but modified silicone oils are preferred. Preferred modified silicone oils include amino-modified silicone oil, epoxy-modified silicone oil, aralkyl-modified silicone oil, epoxy-aralkyl-modified silicone oil, alcohol-modified silicone oil, vinyl-modified silicone oil, and urethane-modified silicone oil, with epoxy-modified silicone oil, aralkyl-modified silicone oil, and epoxy-aralkyl-modified silicone oil being particularly preferred. It is also preferred to use a combination of two or more of these release agents. While oily silicone oils can be used, modified silicone oils are preferred. Preferred modified silicone oils include amino-modified silicone oil, epoxy-modified silicone oil, aralkyl-modified silicone oil, epoxy-aralkyl-modified silicone oil, alcohol-modified silicone oil, vinyl-modified silicone oil, and urethane-modified silicone oil, with epoxy-modified silicone oil, aralkyl-modified silicone oil, and epoxy-aralkyl-modified silicone oil being particularly preferred. It is also preferable to use two or more of these release agents in combination. The amount of these modified silicone oils added is preferably 0.5% by mass or more and 30% by mass or less of the resin material constituting the substrate sheet.

[0116] (Receiving Layer Primer) A primer layer may be provided between the second substrate 22 and the receiving layer 23. The primer layer is an optional layer intended to impart adhesion, antistatic properties, anti-curl properties, etc. between the second substrate 22 and the receiving layer 23.

[0117] Examples of binder resins used in this primer layer include polyurethane resins, polyester resins, polycarbonate resins, polyamide resins, acrylic resins, polystyrene resins, polysulfone resins, polyvinyl chloride resins, polyvinyl acetate resins, vinyl chloride-vinyl acetate copolymer resins, polyvinyl acetal resins, polyvinyl butyral resins, polyvinyl alcohol resins, epoxy resins, cellulose resins, ethylene-vinyl acetate copolymer resins, polyethylene resins, and polypropylene resins.

[0118] Furthermore, it is preferable to add layered silicate to the primer layer to impart conductivity. Layered silicate is a compound obtained by reacting sodium, magnesium, and lithium salts with sodium silicate under appropriate conditions. There are no particular limitations on the thickness of the primer layer, but it is preferably 0.05 μm or more and 5 μm or less, and more preferably 0.2 μm or more and 2 μm or less.

[0119] (Protective layer) In the skin design sheet of the present disclosure, the sealing portion may include, for example, an adhesive layer, a second substrate, a concealing layer, a receiving layer, and a protective layer in this order, or may include, in this order, an adhesive layer, a second substrate, a concealing layer, a receiving layer on which an image is formed, and a protective layer.

[0120] The protective layer may be made of a resin material, such as polyester, polyamide, polyurethane, polycarbonate, vinyl resin, styrene resin, acrylic resin, acrylic polyol resin, cellulose resin, phenoxy resin, epoxy resin, silicone-modified versions of these resins, ultraviolet-absorbing resins, and ionizing radiation-curable resins.

[0121] Examples of polyesters include polyethylene terephthalate and polyethylene naphthalate. Examples of vinyl resins include vinyl chloride-vinyl acetate copolymer, polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyvinyl acetal, and polyvinylpyrrolidone. Examples of cellulose resins include ethyl cellulose, hydroxyethyl cellulose, ethylhydroxycellulose, methyl cellulose, and cellulose acetate.

[0122] Examples of ionizing radiation curable resins include resins obtained by crosslinking and curing a radical polymerizable polymer or a radical polymerizable oligomer by irradiating it with ionizing radiation. Specific examples include resins obtained by adding a photopolymerization initiator to a radical polymerizable polymer or a radical polymerizable oligomer as needed, and polymerizing and crosslinking the resulting polymer or oligomer by irradiating it with an electron beam or ultraviolet light.

[0123] The content of the resin material in the protective layer is preferably 80% by mass or more, and more preferably 85% by mass or more, based on the total mass of the protective layer, which can provide, for example, sufficient durability to the protective layer.

[0124] The protective layer may contain additives. Examples of additives include ultraviolet absorbers, light stabilizers, antioxidants, colorants, fillers, and release agents. The protective layer may contain a colorant, if necessary. The protective layer may contain a colorant to match the color tone of the laminated sheet to a desired color, such as skin color. Examples of colorants include pigments and dyes.

[0125] The content of the additive in the protective layer is preferably 1% by mass or more, more preferably 2% by mass or more, and preferably 20% by mass or less, more preferably 15% by mass or less, based on the total mass of the protective layer. The content of the additive in the protective layer is, for example, 1% by mass or more and 20% by mass or less.

[0126] The thickness of the protective layer is preferably 0.1 μm or more, more preferably 0.5 μm or more, and even more preferably 1 μm or more, and is preferably 20 μm or less, more preferably 10 μm or less, and even more preferably 5 μm or less. Such a protective layer can, for example, impart sufficient protective function to the skin design sheet.

[0127] The protective layer can be formed, for example, by applying a coating liquid containing the above-mentioned materials to a receiving layer or the like by a known means such as roll coating, reverse roll coating, gravure coating, reverse gravure coating, bar coating, or rod coating, and then drying the coating.

[0128] The protective layer can be formed, for example, by preparing a thermal transfer sheet having a protective layer, superimposing the thermal transfer sheet on a substrate film or the like corresponding to the substrate sheet, and transferring the protective layer onto the receiving layer or the receiving layer on which an image is formed by a thermal transfer process.

[0129] The skin design sheet S shown in Figure 1 can be produced by laminating the release layer 12 of the release sheet 10 and the adhesive layer 21 of the seal portion 20 face to face. As an alternative process, it can also be produced by coating the adhesive layer 21 on top of the release layer 12 of the release sheet 10, and laminating this adhesive layer 21 and a second substrate 22 (seal substrate) face to face. Which method is best to use should be determined taking into account the relationship with the coating unit and drying zone of the production line.

[0130] (Concealing Layer) The surface design sheet (sticker-type thermal transfer image receiving sheet) of the present disclosure may have a concealing layer. Examples of the concealing layer include a white primer layer containing a white pigment and a resin material. For example, by providing an acrylic resin containing 40% by mass or more and 85% by mass or less of a white pigment such as titanium oxide, with a thickness of approximately 0.1 μm to 2.0 μm, the color of the base can be completely concealed or slightly visible. Such a concealing layer can be formed as part of the layer of the second substrate 22 (sealing substrate), or can be formed by printing it into a ribbon panel.

[0131] Examples of white pigments include titanium oxide, zinc oxide, zinc sulfide, barium sulfate, and calcium carbonate. Among these, titanium oxide is preferred from the viewpoint of whiteness. The hiding layer may contain one or more white pigments.

[0132] The content of the white pigment in the hiding layer is preferably 40% by mass or more and 85% by mass or less, more preferably 50% by mass or more and 80% by mass or less. By increasing or decreasing the content of the white pigment in the hiding layer, the hiding ratio of the hiding layer can be adjusted to a desired value.

[0133] Examples of resin materials include (meth)acrylic resins, polyolefins, styrene resins, vinyl resins such as ethylene-vinyl acetate copolymers and vinyl chloride-vinyl acetate copolymers, polyesters, polyamides, imide resins, cellulose resins, polyol resins, polycarbonates, and ionomer resins.

[0134] (Concealment ratio of the sealed portion) The skin design sheet of the present disclosure has a concealment ratio (YB / YW) measured from the surface side of the second substrate of the sealed portion (i.e., a laminate having an adhesive layer and a second substrate as essential components, and an optional concealment layer, a receiving layer on which an image is formed, and a protective layer) by a test method in accordance with Method B of JIS K5600-4-1, of 5% or more and 40% or less, and preferably 10% or more and 35% or less.

[0135] If the hiding ratio (YB / YW) of the seal portion is 5% or more, the image can be properly expressed when it is applied to the skin as a body paint seal, for example. On the other hand, if the hiding ratio (YB / YW) of the seal portion is 40% or less, the seal portion is moderately transparent, allowing the color of the bare skin to be seen, resulting in a more natural appearance when it is applied to the skin as a body paint seal, for example.

[0136] Specifically, the hiding rate of the sealed portion is measured in accordance with a test method conforming to Method B of JIS K5600-4-1, by directly attaching the adhesive layer of the sealed portion, with the release sheet removed from the skin design sheet, to a hiding rate test paper.

[0137] (Concealment rate of skin design sheet) The skin design sheet of the present disclosure, i.e., a laminate having a release sheet, an adhesive layer, and a second substrate as essential components, and an optional configuration of a white printed layer, a concealment layer, a receiving layer on which an image is formed, and a protective layer, has a concealment rate (YB / YW) measured in accordance with method B of JIS K5600-4-1 of 30% or more and 99% or less.

[0138] If the concealment rate of the entire skin design sheet is within the above range, when printing on the skin design sheet using a printer, the skin design sheet can be reliably detected within the printer, so that the desired pattern can be reliably printed on the skin design sheet without any problems such as not being able to print.

[0139] Specifically, the hiding rate of the entire skin design sheet is measured by fixing the skin design sheet to a hiding rate test paper in accordance with a test method conforming to Method B of JIS K5600-4-1.

[0140] (Stiffness of skin design sheet) The skin design sheet of the present disclosure has a stiffness measured by the Gurley method of the stiffness test method in accordance with JIS L 1085:1998 standard, and the stiffness of the entire skin design sheet, i.e., the entire laminate having the essential components of the release sheet, adhesive layer, and second substrate, and the optional components of the white printing layer, concealing layer, receiving layer on which an image is formed, and protective layer, in the printer transport direction (when the skin design sheet is in roll form) or the MD direction (when the skin design sheet is in sheet form) is preferably 300 mgf or more and 1200 mgf or less, more preferably 300 mgf or more and 700 mgf or less.

[0141] If the bending resistance of the entire skin design sheet is within the above range, when printing on the skin design sheet using a printer, the skin design sheet will not curl in the printer, and the desired pattern can be reliably printed on the skin design sheet.

[0142] In addition, the stiffness of the entire skin design sheet in a direction perpendicular to the printer transport direction (when the skin design sheet is in roll form) or in the TD direction (when the skin design sheet is in sheet form) is preferably 900 mgf or more and 2000 mgf or less, and more preferably 920 mgf or more and 1500 mgf or less.

[0143] The total thickness of the entire skin design sheet of the present disclosure is preferably 50 μm or more, more preferably 150 μm or more, and preferably 250 μm or less, more preferably 200 μm or less. The total thickness of the skin design sheet is, for example, 150 μm or more and 250 μm or less.

[0144] If the total thickness of the skin design sheet is within the above range, the hiding ratio of the skin design sheet and the bending resistance of the skin design sheet in the printer conveying direction (MD direction) tend to meet the above-mentioned requirements.

[0145] In the present disclosure, the seal portion 20 of the produced skin design sheet S was further cut in half to produce a "skin design sheet with a frame" having a specific frame. The surface view of the produced skin design sheet is shown in Figure 3, and a cross-sectional view is shown in Figure 4.

[0146] The half cut 2 divides the sealed portion 20 into a frame portion 4 and a remaining portion 5. In the example shown in FIG. 3, the frame portions 4 are formed in a roughly rectangular and circular shape by the half cut process. The detection holes 1 formed as detection portions are through holes that penetrate the skin design sheet S and are formed at predetermined intervals in the longitudinal direction of the skin design sheet S. The detection holes 1 function as detection marks when forming an image on the frame portion 4 (and the remaining portion 5) with a printer. The detection holes 1 also serve as a position reference in the longitudinal direction MD when printing a pattern at a specific position on the sealed portion 20. The longitudinal direction MD refers to the machine direction when manufacturing the film and when printing with a printer.

[0147] 5 and 6, the half cut 2 surrounding the link portion 4 may be discontinuous by a bridge portion 3. The link portion 4 and the remaining portion 5 separated by the half cut 2 are connected by the bridge portion 3.

[0148] For example, the bridge portions 3 are provided at at least two locations of the half cut 2 surrounding one frame portion 4. The bridge portions 3 are also provided at the leading end and the trailing end of the skin design sheet S in the longitudinal direction MD.

[0149] When a printer prints a skin design image on the frame portion 4, the skin design sheet S repeatedly moves forward and backward along the longitudinal direction MD. Because bridge portions 3 are provided at the leading and trailing ends in the longitudinal direction MD, peeling of the frame portion 4 during the printing process can be prevented.

[0150] The skin design sheet S is set in the thermal transfer printer in the form of a roll wound with the second substrate 22 facing outward. The longitudinal direction MD of the skin design sheet S is the winding direction of the skin design sheet S.

[0151] The width W of the bridge portion 3 is preferably 0.1 mm or more, more preferably 0.2 mm or more. By setting the width W to 0.1 mm or more, peeling of the frame portion 4 can be suppressed during image printing with a thermal transfer printer. Furthermore, the width W of the bridge portion 3 is preferably 0.8 mm or less, more preferably 0.5 mm or less. By setting the width W to 0.8 mm or less, the bridge portion 3 is easily cut when the frame portion 4 is peeled from the release sheet 10, thereby suppressing deformation or wrinkling of the frame portion 4. It is preferable that there be at least one bridge portion 3 at each of the leading and trailing ends in the longitudinal direction MD of each frame. However, this is not limited to a single bridge portion 3 being located at a location other than the leading and trailing ends, for example, on a side perpendicular to the bridge shown in FIG. 5, as long as the purpose of preventing frame peeling is achieved.

[0152] The present disclosure will now be described in more detail with reference to examples, but the present disclosure is not limited to these examples.

[0153] (Example 1-1) A 100 μm thick translucent matte PET sheet (YB / YW = 7.4%) was used as the release sheet substrate, and a release layer coating liquid 1 having the following composition was applied and dried on one side of the release sheet substrate to form a 0.5 μm thick release layer, thereby producing a release sheet. Next, an acrylic adhesive (Soken Chemical & Engineering Co., Ltd., SK Dyne 1251) was applied and dried as an adhesive on a 50 μm thick translucent polyvinyl chloride film (seal substrate) (YB / YW = 4.2%) to form a 15 μm thick adhesive layer, thereby producing a seal portion. This seal portion was bonded to the previously prepared release sheet, and the release sheet substrate, release layer, adhesive layer and seal substrate were laminated in this order to produce the skin design sheet of Example 1-1.

[0154] <Release layer coating liquid 1> Heavy release silicone (KS3703T, Shin-Etsu Chemical Co., Ltd.) 2 parts Platinum-containing catalyst (CAT-PL-50T, Shin-Etsu Chemical Co., Ltd.) 0.04 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0155] (Example 1-2) A texture-design sheet of Example 1-2 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 2 having the following composition.

[0156] <Release layer coating liquid 2> Ultra-heavy release silicone (X-62-2825, Shin-Etsu Chemical Co., Ltd.) 2 parts Platinum-containing catalyst (CAT-PL-50T, Shin-Etsu Chemical Co., Ltd.) 0.04 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0157] Example 1-3 A texture-design sheet of Example 1-3 was obtained in the same manner as in Example 1-2, except that the release sheet substrate was a semi-transparent matte PET sheet (YB / YW=5.3%) having a thickness of 50 μm.

[0158] (Example 1-4) A texture-design sheet of Example 1-4 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 3 having the following composition.

[0159] <Release layer coating liquid 3> Vinyl chloride-vinyl acetate copolymer 2 parts (Solvine (registered trademark) CNL, Nissin Chemical Co., Ltd.) Ultra-heavy release silicone (X-62-2825, Shin-Etsu Chemical Co., Ltd.) 10 parts Platinum-containing catalyst (CAT-PL-50T, Shin-Etsu Chemical Co., Ltd.) 0.24 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 110 parts

[0160] (Example 1-5) A texture-design sheet of Example 1-5 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 4 having the following composition.

[0161] <Release layer coating liquid 4> Vinyl chloride-vinyl acetate copolymer 2 parts (Solvine (registered trademark) CNL, Nissin Chemical Co., Ltd.) Ultra-heavy release silicone (X-62-2825, Shin-Etsu Chemical Co., Ltd.) 4 parts Platinum-containing catalyst (CAT-PL-50T, Shin-Etsu Chemical Co., Ltd.) 0.12 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 55 parts

[0162] (Example 1-6) A texture-design sheet of Example 1-6 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 5 having the following composition.

[0163] <Release layer coating liquid 5> Vinyl chloride-vinyl acetate copolymer 2 parts (Solvine (registered trademark) CNL, Nissin Chemical Co., Ltd.) Ultra-heavy release silicone (X-62-2825, Shin-Etsu Chemical Co., Ltd.) 2 parts Platinum-containing catalyst (CAT-PL-50T, Shin-Etsu Chemical Co., Ltd.) 0.08 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 36 parts

[0164] (Example 1-7) A texture-design sheet of Example 1-7 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 6 having the following composition.

[0165] <Release layer coating liquid 6> Vinyl chloride-vinyl acetate copolymer 2 parts (Solvine (registered trademark) CNL, Nissin Chemical Co., Ltd.) Ultra-heavy release silicone (X-62-2825, Shin-Etsu Chemical Co., Ltd.) 1 part Platinum-containing catalyst (CAT-PL-50T, Shin-Etsu Chemical Co., Ltd.) 0.06 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 27 parts

[0166] (Example 1-8) A texture-design sheet of Example 1-8 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 7 having the following composition.

[0167] <Release layer coating liquid 7> Vinyl chloride-vinyl acetate copolymer 2 parts (Solvine (registered trademark) CNL, Nissin Chemical Co., Ltd.) Ultra-heavy release silicone (X-62-2825, Shin-Etsu Chemical Co., Ltd.) 0.1 part Platinum-containing catalyst (CAT-PL-50T, Shin-Etsu Chemical Co., Ltd.) 0.04 part MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0168] (Example 1-9) A texture-design sheet of Example 1-9 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 8 having the following composition.

[0169] <Release layer coating liquid 8> Acrylic resin (Dianal (registered trademark) BR-85, Mitsubishi Chemical Corporation) 1 part Ultra-heavy release silicone (X-62-2825, Shin-Etsu Chemical Co., Ltd.) 2 parts Platinum-containing catalyst (CAT-PL-50T, Shin-Etsu Chemical Co., Ltd.) 0.08 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0170] Example 1-10 A texture-design sheet of Example 1-10 was obtained in the same manner as in Example 1-2, except that the seal substrate was a transparent polyvinyl chloride film (YB / YW=0.9%) having a thickness of 50 μm.

[0171] Example 1-11 A texture-design sheet of Example 1-11 was obtained in the same manner as in Example 1-2, except that the seal substrate was a white polyvinyl chloride film (YB / YW=92%) having a thickness of 50 μm.

[0172] (Example 1-12) The release sheet substrate was a transparent PET sheet (YB / YW = 0.7%) having a thickness of 100 μm, and the seal substrate was a white polyvinyl chloride film (YB / YW = 92%) having a thickness of 50 μm. Except for this, the same procedures as in Example 1-2 were carried out to obtain a skin-design sheet of Example 1-12.

[0173] (Example 1-13) A skin-design sheet of Example 1-13 was obtained in the same manner as in Example 1-2, except that an acrylic strong adhesive (SK Dyne 1515DT, Soken Chemical & Engineering Co., Ltd.) was used as the adhesive to form an adhesive layer.

[0174] (Example 1-14) As a seal substrate, a 50 μm-thick semi-transparent polyvinyl chloride film was coated with the following coating liquid 1 for receiving layer at a rate of 5 g / m ２ A texture-design sheet of Example 1-14 was obtained in the same manner as in Example 1-2, except that a coated seal substrate raw sheet (YB / YW = 4.8%) was used.

[0175] <Coating liquid 1 for forming receptor layer> Vinyl chloride-vinyl acetate copolymer (1000A, manufactured by Denki Kagaku Kogyo Co., Ltd.) 100 parts Epoxy-modified silicone (X-22-3000T, manufactured by Shin-Etsu Chemical Co., Ltd.) 3.5 parts Methylstyrene-modified silicone 3.5 parts (X-24-510, manufactured by Shin-Etsu Chemical Co., Ltd.) Polyether-modified silicone (FZ2101, manufactured by Nippon Unicar Co., Ltd.) 2.5 parts Methyl ethyl ketone (MEK) 200 parts Toluene 200 parts

[0176] (Example 1-15) A texture-design sheet of Example 1-15 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 9 having the following composition.

[0177] <Release layer coating liquid 9> Water repellent silicone (KR-4000G, Shin-Etsu Chemical Co., Ltd.) 2.0 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0178] (Example 1-16) A texture-design sheet of Example 1-16 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 10 having the following composition.

[0179] <Release layer coating liquid 10> Water repellent silicone (KR-251, Shin-Etsu Chemical Co., Ltd.) 2.0 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0180] (Example 1-17) A texture-design sheet of Example 1-17 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 11 having the following composition.

[0181] <Release layer coating liquid 11> Silicone for water repellent (X-40-2327, Shin-Etsu Chemical Co., Ltd.) 2.0 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0182] (Example 1-18) A texture-design sheet of Example 1-18 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 12 having the following composition.

[0183] <Release layer coating liquid 12> Water repellent silicone (KR-400, Shin-Etsu Chemical Co., Ltd.) 2.0 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0184] (Example 1-19) A texture-design sheet of Example 1-19 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 13 having the following composition.

[0185] <Release layer coating liquid 13> Water repellent silicone (KR-401, Shin-Etsu Chemical Co., Ltd.) 2.0 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0186] (Example 1-20) A texture-design sheet of Example 1-20 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 14 having the following composition.

[0187] <Release layer coating liquid 14> Vinyl chloride-vinyl acetate copolymer 2.0 parts (Solvine (registered trademark) CNL, Nissin Chemical Co., Ltd.) Water repellent silicone (KR-500, Shin-Etsu Chemical Co., Ltd.) 2.0 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0188] (Example 1-21) A skin-design sheet of Example 1-21 was obtained in the same manner as in Example 1-2, except that an acrylic adhesive (SK Dyne MD-1, Soken Chemical & Engineering Co., Ltd.) was used as the adhesive to form an adhesive layer.

[0189] (Example 1-22) A texture-design sheet of Example 1-22 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 15 having the following composition.

[0190] <Release layer coating liquid 15> Medium release silicone (KS-774, Shin-Etsu Chemical Co., Ltd.) 2.0 parts Platinum-containing catalyst (CAT-PL-50T, Shin-Etsu Chemical Co., Ltd.) 0.04 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0191] (Comparative Example 1-1) A texture-design sheet of Comparative Example 1-1 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 16 having the following composition.

[0192] <Release layer coating liquid 16> Light release silicone (KS847H, Shin-Etsu Chemical Co., Ltd.) 2 parts Platinum-containing catalyst (CAT-PL-50T, Shin-Etsu Chemical Co., Ltd.) 0.04 parts MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0193] Comparative Example 1-2 A texture-design sheet of Comparative Example 1-2 was obtained in the same manner as in Example 1-1, except that the release layer was omitted.

[0194] (Comparative Example 1-3) A texture-design sheet of Comparative Example 1-3 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 17 having the following composition.

[0195] <Release layer coating liquid 17> Vinyl chloride-vinyl acetate copolymer 2 parts (Solvine (registered trademark) CNL, Nissin Chemical Co., Ltd.) MEK / toluene=1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0196] (Comparative Example 1-4) A texture-design sheet of Comparative Example 1-4 was obtained in the same manner as in Example 1-1, except that the release layer was formed by changing the release layer coating liquid 1 to the release layer coating liquid 18 having the following composition.

[0197] <Release layer coating liquid 18> Acrylic resin 2 parts (Dianal (registered trademark) BR-85, Mitsubishi Chemical Corporation) MEK / toluene = 1 / 1 (weight ratio 1 / 1, mixed solvent) 18 parts

[0198] (Comparative Example 1-5) A texture-design sheet of Comparative Example 1-5 was obtained in the same manner as in Comparative Example 1-1, except that the release sheet substrate was a 100 μm thick white void PET sheet (YB / YW=94%) and the seal substrate was a 80 μm thick white laminate film (YB / YW=95%) in which a void PET film, a primer layer, and a receiving layer were laminated. The receiving layer was formed by coating the receiving layer-forming coating liquid 1 of Example 1-13 at 5 g / m ２ The primer layer was formed by applying a primer layer coating solution 1 having the following composition at a rate of 1 g / m. ２It was formed by coating.

[0199] <Primer layer coating liquid 1> Polyester resin (manufactured by Mitsubishi Chemical Corporation, trade name: WR-905) 15 parts Titanium oxide (manufactured by Mitsubishi Chemical Corporation, trade name: TCA-888) 25 parts Water / isopropyl alcohol (mass ratio 2 / 1) 60 parts

[0200] (Comparative Example 1-6) A skin-design sheet of Comparative Example 1-6 was obtained in the same manner as in Example 1-2, except that an acrylic adhesive (acrylic acid / butyl acrylate / vinyl acetate = 4 / 90 / 6, ethyl acetate solution) was used as the adhesive to form an adhesive layer.

[0201] (Half-cut processing) A detection hole was formed in the skin design sheet produced in the examples and comparative examples using a Thomson-type half-cut processing machine, and further, a half-cut was formed from the surface of the seal substrate to the middle of the release sheet substrate, forming a half-cut processed skin design sheet having a circular top shape with a diameter of 30 mm and a square top shape with a side of 50 mm.

[0202] (Image Printing) The half-cut texture design sheets of the Examples and Comparative Examples were set in a thermal transfer printer (DS620, Dai Nippon Printing Co., Ltd.), and a 128 / 255 gray image was printed on each frame using an ink ribbon for the DS620.

[0203] <<Evaluation of Peeling During Conveyance>> The frame portion of the texture design sheet being conveyed in the thermal transfer printer during printing processing was observed, and peeling at the leading edge and frame during conveyance was evaluated based on the following evaluation criteria. The results are shown in Table 1.

[0204] "Evaluation criteria" A: No peeling at the leading edge occurred. 100 sheets printed, and no frame peeling occurred. B: No peeling at the leading edge occurred. 1 or 2 sheets printed, and 100 sheets printed, and frame peeling occurred. C: No peeling at the leading edge occurred. 3 to 5 sheets printed, and 100 sheets printed, and frame peeling occurred. D: Peeling at the leading edge occurred, and printing was not possible.

[0205] <<Peel Force Measurement>> The skin-design sheets produced in the examples and comparative examples were subjected to a test in accordance with JIS K 6854-3:1999 (Adhesives-Peel Adhesion Strength Test Method-Part 3: T-Peel) using a small tabletop testing machine (EZ Test series, manufactured by Shimadzu Corporation), the sealed portion was peeled from the release sheet, and the peel force at that time was measured. The results are shown in Table 1.

[0206] <<Adhesion Measurement to SUS Plate>> The textured sheets prepared in the Examples and Comparative Examples were cut to 75 mm x 25 mm, and the release sheet was peeled off to expose the adhesive layer of the sealed portion to prepare test specimens. The adhesive strength of the test specimens to SUS plate was measured. Adhesion to SUS plate was measured in accordance with Method 1 of the test method of JIS Z0237:2022 (Test Methods for Adhesive Tapes and Adhesive Sheets) (a test method in which the tape and sheet are peeled off at a 180° angle from the stainless steel test plate at a temperature of 23°C and humidity of 50%), by peeling the test specimen lengthwise at a width of 25 mm, a peel angle of 180°, and a peel rate of 300 mm / min. The SUS plate used was SUS304, with a BA surface finish, a surface roughness Ra of 0.07 μm, a thickness of 1.5 mm, and dimensions of 100 mm x 150 mm. The measurement results are shown in Table 1.

[0207] <<Water Contact Angle Measurement>> The seal portions of the skin-design sheets produced in the Examples and Comparative Examples were peeled off to expose the release layer of the release sheet, and the water contact angle of the surface of the release layer was measured (sessile drop method) in accordance with JIS R 3257:1999 under the following conditions. The measurement was performed five times, and the average value was calculated. The results are shown in Table 1.

[0208] [Conditions for measuring water contact angle] Measuring device: Contact angle measuring device DropMaster DM700 (manufactured by Kyowa Interface Science Co., Ltd.) Measurement atmosphere: 23°C, 50% RH Measurement liquid: Distilled water Volume of water droplet: 2 μL Measurement time: 1500 ms after droplet landing

[0209] <<Silicone Weight Ratio>> The silicone resin content (wt%) in the release layer of the release sheet of the skin-design sheet produced in the Examples and Comparative Examples is shown in Table 1. Resin content: R parts by weight Crosslinked silicone content: S parts by weight Crosslinked silicone content = S / (R+S) (%)

[0210] <<Removability of Seal Portion>> The edge of the frame of the skin-design sheet produced in the Examples and Comparative Examples was hooked with a fingertip to create a trigger, and the ease of peeling when peeling from the release sheet was evaluated based on the following evaluation criteria. Five sheets were peeled off, and the load on the fingertip was evaluated. The results are shown in Table 1.

[0211] "Evaluation Criteria" A: Overall, it was extremely easy to peel off without any significant strain. B: It was easy to peel off, even if there was some strain. C: It was difficult to peel off due to a significant strain. The sticker stretched or tore. (The sticker did not actually peel off, and the feeling of adhesion or pain when peeling could not be evaluated.)

[0212] <<Feeling of adhesion>> The frame portions of the skin-design sheets produced in the Examples and Comparative Examples were peeled off from the release sheet and applied to human skin, and the feeling of adhesion was evaluated based on the following evaluation criteria. Five evaluators (two men (in their 20s and 60s) and three women (in their 20s, 30s, and 40s)) were asked to apply the sheets to the "back of their hands." The evaluation environment was a room at 23°C and 50% RH. The results are shown in Table 1.

[0213] "Evaluation criteria" A: 4 or 5 people commented that it felt comfortable to apply. B: It was a little stiff, but 2 or 3 or more people commented that it felt comfortable to apply. C: It was quite stiff, and 1 or less people commented that it felt comfortable to apply. -: The sticker did not actually peel off, and could not be evaluated.

[0214] <<Pain upon Peeling>> The frame portions of the skin-design sheets produced in the Examples and Comparative Examples were peeled off from the release sheet and applied to the skin, and the pain experienced when peeling the frame portions from the skin was evaluated based on the following evaluation criteria. Five evaluators (two men in their 20s and 60s, and three women in their 20s, 30s, and 40s) were asked to apply two square frames (50 mm x 50 mm) to the "inside of the forearm." After spending one hour in a room at 23°C and 50% RH, the frames were peeled off and the pain felt at that time was evaluated. The results are shown in Table 1.

[0215] "Evaluation criteria" The evaluation criteria for whether there was pain or not were as follows: Painful... "Although the peel-off sticker pulled, there was almost no pain" No pain... "The peel-off sticker pulled, and it felt painful" A: Less than one person out of five felt pain. B: Two people out of five felt pain. C: Three or more people out of five felt pain. -: The sticker did not actually come off, and could not be evaluated.

[0216] "Evaluation criteria" for overall evaluation Overall evaluation of four characteristics: "peeling during transport, peeling properties, adhesion feeling, and pain upon removal" A: All four evaluations were rated A. B: Peeling during transport was rated B or C, and the rest were rated A. Or, peeling during transport was rated A, and at least one of peeling properties, adhesion feeling, and pain upon removal was rated B. C: Peeling during transport was rated D. Or, peeling during transport was rated A, B, or C, and at least one of peeling properties, adhesion feeling, and pain upon removal was rated C.

[0217] (Example 1-24) The same procedure as in Example 1-4 was carried out, except that a dye-sublimation thermal transfer printer SELPHYCP1300 (manufactured by Canon) was used instead of the printer DS620, and the texture design sheet of Example 1-4 (single-fed sheet, with half cut, without detection hole) was used instead of the genuine color ink / paper (KP-36IP), and a 128 / 255 gray image was printed on each frame. As a result of the same evaluation, no peeling occurred during transport, and the seal peelability, adhesion feel, and peeling pain were all rated A, just like in Example 1-4, resulting in an overall rating of A.

[0218]

[0219] It was confirmed that when the peeling force of the seal part from the release sheet is 0.07 N / 20 mm or more and 5.0 N / 20 mm or less, the water contact angle of the release layer surface is 80° or more and 109° or less, and the adhesive strength of the adhesive layer 21 to the SUS plate is 1.0 N / 20 mm or more and 10.0 N / 20 mm or less, peeling during transportation does not occur easily and there is almost no pain when peeling the seal part that has been stuck to the skin.

[0220] The skin design sheet of Comparative Example 1-1 had a large water contact angle of the release layer, and pieces peeled off during transport. The skin design sheet of Comparative Example 1-2 did not have a release layer, so pieces did not peel off. The skin design sheets of Comparative Examples 1-3 and 1-4 did not actually peel off. The skin design sheet of Comparative Example 1-5 had a thick seal part, and did not feel good when attached. The skin design sheet of Comparative Example 1-6 had strong adhesive strength, and it was painful to peel off.

[0221] Example 2-1 A texture-design sheet of Example 2-1 was obtained in the same manner as in Example 1-2, except that the seal substrate was a polyvinyl chloride film having a thickness of 70 μm and a YB / YW ratio of 11.4%.

[0222] Example 2-2 A texture-design sheet of Example 2-2 was obtained in the same manner as in Example 1-2, except that the seal substrate was a polyvinyl chloride film having a thickness of 70 μm and a YB / YW ratio of 23.7%.

[0223] Example 2-3 A texture-design sheet of Example 2-3 was obtained in the same manner as in Example 1-2, except that the seal substrate was a polyvinyl chloride film with a thickness of 70 μm and a YB / YW ratio of 38.4%.

[0224] (Example 2-4) As a seal base material, a polyvinyl chloride film having a thickness of 70 μm and no white pigment added was coated with the following concealing layer forming coating liquid and dried to form a concealing layer having a thickness of 1.0 μm, and then a receiving layer forming coating liquid 1 was coated with and dried to form a receiving layer having a thickness of 1.0 μm. Except for this, a skin design sheet of Example 2-4 was obtained in the same manner as in Example 1-2.

[0225] <Coating liquid for forming hiding layer> Titanium oxide 58 parts (R-780, manufactured by Ishihara Sangyo Kaisha) (Meth)acrylic resin 10.5 parts (Dianal (registered trademark) BR-87, manufactured by Mitsubishi Chemical Corporation) (Meth)acrylic resin 31.5 parts (Dianal (registered trademark) BR-85, manufactured by Mitsubishi Chemical Corporation) Methyl ethyl ketone (MEK) 100 parts Toluene

[0226] Example 2-5 A texture-design sheet of Example 2-5 was obtained in the same manner as in Example 2-4, except that the above-mentioned coating liquid for forming a concealing layer was applied and dried to form a concealing layer having a thickness of 2.0 μm.

[0227] Example 2-6 A texture-design sheet of Example 2-6 was obtained in the same manner as in Example 1-1, except that the seal substrate was a polyvinyl chloride film having a thickness of 50 μm and a YB / YW ratio of 12.2%.

[0228] Example 2-7 A texture-design sheet of Example 2-7 was obtained in the same manner as in Example 1-2, except that the seal substrate was a polyvinyl chloride film having a thickness of 100 μm and a YB / YW ratio of 13.5%.

[0229] (Example 2-8) The concealing layer forming coating liquid was applied to a 30 μm thick polyurethane film as a seal base material, and dried to form a 1.0 μm thick concealing layer. The receiving layer forming coating liquid 1 was applied to the seal base material and dried to form a 9.0 μm thick receiving layer. The same procedure as in Example 1-2 was repeated except that a skin design sheet of Example 2-8 was obtained.

[0230] Example 2-9 A texture-design sheet of Example 2-9 was obtained in the same manner as in Example 1-2, except that the seal substrate was a polyvinyl chloride film having a thickness of 70 μm and a YB / YW ratio of 1.1%.

[0231] Example 2-10 A texture-design sheet of Example 2-10 was obtained in the same manner as in Example 1-2, except that the seal substrate was a polyvinyl chloride film having a thickness of 70 μm and a YB / YW ratio of 96.8%.

[0232] Example 2-11 A texture-design sheet of Example 2-11 was obtained in the same manner as in Example 2-4, except that the seal substrate was a polyethylene terephthalate film having a thickness of 25 μm.

[0233] Example 2-12 A texture-design sheet of Example 2-12 was obtained in the same manner as in Example 2-4, except that the seal substrate was a polyethylene terephthalate film having a thickness of 100 μm.

[0234] Example 2-13 A texture-design sheet of Example 2-13 was obtained in the same manner as in Example 2-4, except that the seal substrate was a polyurethane film having a thickness of 30 μm.

[0235] Example 2-14 A texture-design sheet of Example 2-14 was obtained in the same manner as in Example 2-4, except that the seal substrate was a polyurethane film having a thickness of 50 μm.

[0236] (Example 2-15) The release sheet substrate was a polyethylene terephthalate film having a thickness of 100 μm, and the following coating liquid for forming a white printing layer was applied to the surface opposite the release layer, and dried to form a white printing layer having a thickness of 1 μm. Except for this, a skin-design sheet of Example 2-15 was obtained in the same manner as in Example 2-1.

[0237] <Coating liquid for forming white printing layer> (Coating liquid for forming back layer) Polyvinyl butyral 10 parts (S-LEC (registered trademark) BL-7, manufactured by Sekisui Chemical Co., Ltd.) Silicon dioxide 7.4 parts (Sylysia 380, manufactured by Fuji Silysia Chemical Ltd.) Titanium chelate 0.32 parts (AT chelating agent, manufactured by Denka Polymer Co., Ltd.) Toluene 54 parts IPA 54 parts (Coating liquid for back layer) Polyvinyl butyral 10 parts (S-LEC (registered trademark) BL-7, Sekisui Chemical Co., Ltd.) Nylon particles (average particle size 7.5 μm) 2 parts (MW330, Shinto Paint Co., Ltd.) Pt catalyst 0.44 parts (CAT-PL-50T, Shin-Etsu Chemical Co., Ltd.) Reaction retarder 0.36 parts (CAT-PLR-5 Shin-Etsu Chemical Co., Ltd.) Titanium chelate 2.4 parts (AT chelating agent Denka Polymer Co., Ltd.) Toluene 30 parts Isopropyl alcohol 30 parts

[0238] Example 2-16 A texture-design sheet of Example 2-16 was obtained in the same manner as in Example 2-15, except that the release sheet substrate was a polyethylene terephthalate film having a thickness of 125 μm.

[0239] (Example 2-17) The seal substrate was a polyvinyl chloride film having a thickness of 50 μm and a YB / YW=12.2%, and the release sheet substrate was a polyethylene terephthalate film having a thickness of 50 μm. Except for this, the same procedure as in Example 2-15 was followed to obtain a skin-design sheet of Example 2-17.

[0240] Example 2-18 A texture-design sheet of Example 2-18 was obtained in the same manner as in Example 2-15, except that the release sheet substrate was a polyethylene terephthalate film having a thickness of 50 μm.

[0241] (Example 2-19) A 100 μm thick polyester synthetic paper (Crisper K1212, manufactured by Toyobo Co., Ltd.) was used as the release sheet substrate, and the following transparent printing layer forming coating liquid was used instead of the white printing layer forming coating liquid. Except for this, the same procedures as in Example 2-1 were carried out to obtain a skin design sheet of Example 2-19.

[0242] <Coating liquid for forming transparent printing layer> (Coating liquid for forming back layer) Polyvinyl butyral 10 parts (S-LEC (registered trademark) BL-7, manufactured by Sekisui Chemical Co., Ltd.) Titanium chelate 0.32 parts (AT chelating agent, manufactured by Denka Polymer Co., Ltd.) Toluene 54 parts IPA 54 parts (Coating liquid for back layer) Polyvinyl butyral 10 parts (S-LEC (registered trademark) BL-7, Sekisui Chemical Co., Ltd.) Nylon particles (average particle size 7.5 μm) 2 parts (MW330, Shinto Paint Co., Ltd.) Pt catalyst 0.44 parts (CAT-PL-50T, Shin-Etsu Chemical Co., Ltd.) Reaction retarder 0.36 parts (CAT-PLR-5, Shin-Etsu Chemical Co., Ltd.)) Titanium chelate 2.4 parts (AT chelating agent, Denka Polymer Co., Ltd.) Toluene 30 parts Isopropyl alcohol 30 parts

[0243] Example 2-20 A skin-design sheet of Example 2-20 was obtained in the same manner as in Example 2-19, except that the release sheet substrate was changed to a polyester synthetic paper having a thickness of 125 μm (Crisper K1212, manufactured by Toyobo Co., Ltd.).

[0244] [Measurement Method] <Concealment Ratio of Sealed Portion> The concealment ratio of the sealed portion (YB / YW) was determined by a test method in accordance with Method B of JIS K5600-4-1 (Concealment power: for light color paints).

[0245] Specifically, in the skin design sheets of Examples 2-1 to 2-20 and Examples 1-2, 1-10, and 1-11, the adhesive layer of the seal portion was attached to a hiding rate test paper (AS ONE 1-3783-01), and the tristimulus values ​​YB (the Y value of the film attached to the black part) and YW (the Y value of the film attached to the white part) were measured and calculated. The results are shown in Table 2.

[0246] <Concealment ratio of the entire skin design sheet> The concealment ratio (YB / YW) of the entire skin design sheet was determined by a test method in accordance with Method B of JIS K5600-4-1 (concealment power: for light color paints).

[0247] Specifically, the release sheet side of the skin design sheets of Examples 2-1 to 2-20 and Examples 1-2, 1-10, and 1-11 was placed on and fixed to a hiding power test paper (AS ONE 1-3783-01), and the tristimulus values ​​YB (the Y value of the film attached to the black part) and YW (the Y value of the film attached to the white part) were measured and calculated. The results are shown in Table 2.

[0248] <50% strain stress of seal portion> The 50% strain stress was determined from the "stress-strain curve (SS curve)" obtained by a test method in accordance with JIS-K 7127:1999.

[0249] [Stress-strain curve] A "stress-strain curve" was obtained by a tensile test in accordance with JIS K 7127: 1999. The tensile test was performed using a small tabletop testing machine (EZ Test series, manufactured by Shimadzu Corporation) as a measuring instrument under the measurement conditions shown below. The test was performed on the skin-design sheets of Examples 2-1 to 2-20 and Examples 1-2, 1-10, and 1-11.

[0250] (Measurement conditions) ・Test piece: Type 2, width 10 mm ・Initial chuck spacing: 50 mm ・Test speed: 100 mm / min ・Use of 500 N load cell ・Test environment: Temperature 25°C, humidity 50% RH ・Number of measurements: Average of 3 measurements

[0251] <Evaluation 1> The seal portions of Examples 2-1 to 2-20 and Examples 1-2, 1-10, and 1-11 described above were evaluated from the obtained stress-strain curves to see if they could be stretched by 50%. The results are shown in Table 2. "Evaluation criteria" A: Stretched by 50% B: Not stretched by 50%

[0252] <Evaluation 2> For the seal portions of Examples 2-1 to 2-20 and Examples 1-2, 1-10, and 1-11 described above, the 50% strain stress σ was calculated from the obtained stress-strain curves. The results are shown in Table 2.

[0253] [Evaluation Method] The following evaluations were carried out using the skin-design sheets of Examples 2-1 to 2-20 and Examples 1-2, 1-10 and 1-11 described above.

[0254] <Skin Transparency> Five evaluators attached the seal portion to the skin and performed a sensory evaluation of the "skin transparency" when the seal portion was attached to the skin, and evaluated the result according to the following evaluation criteria. The results are shown in Table 3.

[0255] "Evaluation criteria" A: All 5 people judged that the transparency was good. B: 3 to 4 people judged that the transparency was good. C: 3 or more people judged that the transparency was not good (transparent). D: 3 or more people judged that the transparency was not good (not transparent).

[0256] <Printer Cuttability and Detection> The sheet was set in a thermal transfer printer (DS620, manufactured by Dai Nippon Printing Co., Ltd.), and five sheets were cut using the thermal transfer printer's cutter. The printer cuttability was evaluated according to the following evaluation criteria. The results are shown in Table 3.

[0257] "Evaluation criteria" A: All five stickers were cut successfully. B: One or more stickers had difficulty cutting. (The sticker was not cut.) C: One or more stickers had difficulty cutting. (The printer was unable to detect the sticker.)

[0258] <Bending resistance of skin-design sheets> The bending resistance of the skin-design sheets of Examples 2-1 to 2-20 and Examples 1-2, 1-10, and 1-11 was measured by the Gurley method of the bending resistance test method described in JIS L 1085: 1998. The measuring machine used was a Gurley flexibility tester manufactured by Toyo Seiki Seisakusho, Ltd. The measurement results are shown in Table 2.

[0259] The skin-design sheets of Examples 2-1 to 2-20 were measured for peel strength, adhesive strength, and water contact angle using the same methods as above. The results are shown in Table 2. The skin-design sheets of Examples 2-1 to 2-20 were also evaluated for peeling during transport, peelability, adhesion feel, and pain upon peeling using the same evaluation criteria as above. The results are shown in Table 3.

[0260]

[0261]

[0262] Although the present disclosure has been described in detail with reference to specific embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the spirit and scope of the present disclosure.

[0263] REFERENCE SIGNS LIST 1 detection hole 2 half cut 3 bridge portion 4 link portion 5 remaining portion 10 release sheet 11 first substrate (release sheet substrate) 12 release layer 13 back surface layer 20 sealing portion 21 adhesive layer 22 second substrate (seal substrate) 23 receiving layer

Claims

1. A skin-design sheet having a release sheet and a seal part, wherein the release sheet has a first substrate and a release layer laminated in this order, and the seal part is provided on the release layer so as to be peelable from the release sheet, and the seal part has a laminated structure in which an adhesive layer and a second substrate are laminated in this order from the release sheet side, and the peel strength of the seal part from the release sheet obtained by a test method based on JIS K 6854-3:1999 (Adhesives - Peel adhesion strength test method - Part 3: T-peel) is 0.07 N / 20 mm or more and 5.0 N / 20 mm or less, and the surface of the release layer exposed by peeling the seal part from the release sheet has a water contact angle of 80° or more and 109° or less by the sessile drop method in a wettability test based on JIS R 3257:1999, and the adhesive layer of the seal part is A skin design sheet having an adhesive strength to a SUS plate obtained by a test method conforming to Z0237:2022 of 1.0 N / 20 mm or more and 10.0 N / 20 mm or less.

2. The skin design sheet according to claim 1, wherein the thickness of the first substrate of the release sheet is 10 μm or more and 200 μm or less, and the thickness of the release layer is 0.05 μm or more and 5 μm or less.

3. The skin design sheet according to claim 1, wherein the thickness of the adhesive layer is 5 μm or more and 50 μm or less, and the thickness of the second substrate is 5 μm or more and 150 μm or less.

4. A skin design sheet according to any one of claims 1 to 3, wherein the surface portion of the skin design sheet on the second substrate side is a surface portion that can be printed using an on-demand printing method.

5. The skin design sheet according to claim 4, wherein the on-demand printing method is at least one printing method selected from the group consisting of a thermal transfer method, an inkjet method, and an electrophotographic method.

6. The skin design sheet according to claim 4, wherein the surface portion of the skin design sheet on the second substrate side has a receiving layer that can be printed using the on-demand printing method.

7. The skin design sheet according to claim 1, wherein the seal portion is divided into a frame portion and a remaining portion by half-cutting.

8. The skin design sheet according to claim 1, wherein a detection unit is formed on the release sheet, the seal portion, or both the release sheet and the seal portion.

9. The skin design sheet according to claim 1, wherein the hiding ratio (YB / YW) of either the release sheet or the seal portion, or the skin design sheet, measured from the seal portion side of the skin design sheet using a test method in accordance with Method B of JIS K5600-4-1, is 2.0% or more and 90% or less.

10. The skin design sheet according to claim 1, wherein the hiding ratio (YB / YW) measured from the surface of the seal portion opposite the release sheet by a test method in accordance with Method B of JIS K5600-4-1 is 5% or more and 40% or less.

11. The skin design sheet according to claim 1, wherein the 50% strain stress of the sealing portion is 5 MPa or more and 160 MPa or less in a stress-strain curve obtained by a tensile test (test piece width: 10 mm) in accordance with JIS K 7127:1999.

12. The skin design sheet according to claim 1, wherein the hiding ratio (YB / YW) measured from the surface opposite the release sheet of the sealed portion by a test method conforming to JIS K5600-4-1 Method B is 5% or more and 40% or less, and the hiding ratio (YB / YW) of the skin design sheet measured by a test method conforming to JIS K5600-4-1 Method B is 30% or more and 99% or less.

13. The skin-design sheet according to claim 1, wherein the second substrate is polyvinyl chloride (PVC) or polyurethane.

14. The skin design sheet according to claim 1, wherein the stiffness of the skin design sheet in the printer transport direction measured by the Gurley method of the stiffness test method in accordance with JIS L 1085:1998 is 300 mgf or more and 1200 mgf or less.

15. The skin-design sheet according to claim 1, wherein the surface of the first substrate opposite the release layer has irregularities with an arithmetic mean height Sa of 0.1 μm or more and 2.0 μm or less, measured in accordance with ISO 25178-2:2012.

16. The skin-design sheet according to claim 1, wherein the surface of the first substrate facing the release layer has irregularities with an arithmetic mean height Sa of 0.01 μm or more and 0.30 μm or less, measured in accordance with ISO 25178-2:2012.

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