Laminated Sheet

Abstract

To provide a laminate sheet usable as a skin design sheet with a tactile feeling closer to a real skin.SOLUTION: A laminate sheet includes an adhesive layer and a surface resin layer. In the laminate sheet, a dynamic friction coefficient in the surface resin layer is 0.35 or more, measured using a static-dynamic friction measurement device having a finger model touch contact piece, and Sv (maximum valley depth) stipulated by ISO25178-2:2012 is 30 μm or more.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to laminated sheets. [Background technology]

[0002] Skin design sheets that are applied to the skin are known (see, for example, Patent Document 1). Examples of skin design sheets include tattoo stickers and skin concealing sheets. Tattoo stickers are sheets with various designs printed on a base material. Tattoo stickers are sold, for example, at variety stores, sporting and music event venues, amusement parks, and the like, and are used to liven up the atmosphere. Skin concealing sheets are sheets with a base material pre-colored with a predetermined color by screen printing or the like. Skin concealing sheets are used, for example, to conceal discolored areas such as scratches or blemishes on the skin. Users choose a skin design sheet that matches their skin color.

[0003] The skin design sheet includes, for example, a release sheet, an adhesive layer, a base layer, and a protective sheet in this order in the thickness direction. The skin design sheet is applied to the user's skin by peeling the release sheet from the adhesive layer, attaching the adhesive layer to the skin, and then peeling the protective sheet from the base layer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6147874 Summary of the Invention [Problem to be solved by the invention]

[0005] The texture (feel of touch) of conventional skin design sheets is a film-like texture, and does not have a sufficiently moist feel to the skin, so it cannot necessarily be said to be close to the feel of the skin. The objective of the present disclosure is to provide a laminated sheet that can be used as a skin design sheet that has a feel closer to the skin. [Means for solving the problem]

[0006] The laminate sheet of the present disclosure comprises an adhesive layer and a surface resin layer, and the surface resin layer has a dynamic friction coefficient of 0.35 or more as measured using a static and dynamic friction measuring device equipped with a finger model tactile contactor, and has an Sv (maximum valley depth) of 30 μm or more as defined in ISO25178-2:2012. Effect of the Invention

[0007] According to the present disclosure, a laminate sheet that can be used as a skin design sheet that has a feel similar to that of skin can be provided. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view of a laminate sheet. [Diagram 2] FIG. 2 is a cross-sectional view of a laminated sheet. [Diagram 3] FIG. 3 is a cross-sectional view of a laminated sheet. [Figure 4] FIG. 4 is a schematic diagram of the surface shape indicated by Ssk. [Diagram 5] FIG. 5 is a schematic diagram of the surface shape indicated by Sku. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments of the present disclosure will be described in detail. The present disclosure can be implemented in many different forms, and is not to be interpreted as being limited to the description of the embodiments exemplified below. In the drawings, the width, thickness, shape, etc. of each layer may be shown diagrammatically in order to make the explanation clearer, but these are merely examples and do not limit the interpretation of the present disclosure. In this specification and each figure, elements similar to those already explained with respect to the previous figures are given the same reference numerals, and detailed explanations may be omitted as appropriate.

[0010] In the present disclosure, when multiple upper limit candidates and multiple lower limit candidates are listed for a certain parameter, the numerical range of the parameter may be configured by combining any one upper limit candidate and any one lower limit candidate. Examples of the above parameters include physical property values, component content ratios, and layer thicknesses. As an example, the description "Parameter B is preferably A1 or more, more preferably A2 or more, and even more preferably A3 or more. Parameter B is preferably A4 or less, more preferably A5 or less, and even more preferably A6 or less." will be explained. In this example, the numerical range of parameter B may be A1 or more and A4 or less, A1 or more and A5 or less, A1 or more and A6 or less, A2 or more and A4 or less, A2 or more and A5 or less, A2 or more and A6 or less, A3 or more and A4 or less, A3 or more and A5 or less, or A3 or more and A6 or less.

[0011] In this specification, each of the components (for example, resin materials, and additives such as colorants) appearing in the following description may be used either alone or in combination of two or more kinds.

[0012] [Laminated sheet] The laminate sheet of the present disclosure includes an adhesive layer and a surface resin layer.

[0013] Specific examples of the laminate sheet of the present disclosure will be described below with reference to the drawings. The laminated sheet 1 shown in FIG. 1 includes an adhesive layer 20 and a surface resin layer 10. The surface resin layer 10 has a first surface 1a and a second surface 1b opposite to the first surface 1a. The second surface 1b faces the adhesive layer 20. The first surface 1a is the surface opposite to the second surface 1b. In this example, the surface resin layer 10 is a base layer. In this example, one or both of the adhesive layer 20 and the surface resin layer 10 may be colored with a colorant to a desired color, such as skin color. A printed layer may be provided on either or both surfaces of the base layer.

[0014] The laminate sheet 1 shown in Fig. 2 includes an adhesive layer 20, a base layer 30, and a surface resin layer 10. Thus, the laminate sheet 1 may include the adhesive layer 20, the base layer 30, and the surface resin layer 10 in this order in the thickness direction. In this example, at least one layer selected from the adhesive layer 20, the base layer 30, and the surface resin layer 10 may be colored with a colorant to a desired color, such as skin color. A printed layer may be provided on either one or both surfaces of the base layer.

[0015] 3 further includes a release sheet 40 on the surface of the adhesive layer 20 opposite to the surface facing the base layer 30. In this manner, the laminate sheet 1 may include the release sheet 40, the adhesive layer 20, the base layer 30, and the surface resin layer 10 in this order in the thickness direction.

[0016] The laminate sheet may further include a protective sheet (not shown) on the surface (first surface) of the surface resin layer opposite to the surface (second surface) facing the adhesive layer. The laminate sheet may include an adhesive layer, a base layer as needed, a surface resin layer, and a protective sheet in this order in the thickness direction, or may include a release sheet, an adhesive layer, an optional base layer, a surface resin layer, and a protective sheet in this order in the thickness direction.

[0017] The laminate sheet may include, in this order, a release sheet, an adhesive layer, a base layer, a receiving layer on which an image is formed, and, in this order, a protective sheet, if necessary. In this example, the receiving layer corresponds to the surface resin layer. The laminate sheet may include, in this order, a release sheet, an adhesive layer, a base layer, a receiving layer on which an image is formed, a protective layer, and, in this order, a protective sheet, if necessary. In this example, the protective layer corresponds to the surface resin layer. In these examples, an image of a desired color, such as skin color, is formed on the receiving layer by a coloring agent such as a dye.

[0018] In one embodiment, the laminate sheet of the present disclosure is in the form of a long strip, and FIGS. 1 to 3 are cross-sectional views perpendicular to the longitudinal direction of, for example, a laminate sheet 1.

[0019] <Surface resin layer> The laminate sheet of the present disclosure includes a surface resin layer. The surface resin layer constitutes the surface layer located farthest from the adherend when the laminate sheet is attached to the adherend. When the laminate sheet is provided with a protective sheet, the protective sheet is peeled off.

[0020] The surface resin layer has a first surface and a second surface opposite to the first surface. The second surface is a surface of the surface resin layer facing the adhesive layer, and the first surface is a surface of the surface resin layer opposite to the surface facing the adhesive layer.

[0021] The surface resin layer has a dynamic friction coefficient of 0.35 or more. In this specification, the dynamic friction coefficient is measured using a static / dynamic friction measuring instrument (i-tester TL201Ts, Trinity Lab Co., Ltd.) equipped with a finger model tactile contactor (Trinity Lab Co., Ltd.). The dynamic friction coefficient is measured for the first surface of the surface resin layer by attaching and fixing the laminated sheet to a Bioskin plate (Beaulux Co., Ltd., product number P001-001) having an uneven surface so that the adhesive layer is in contact with the plate. This allows the dynamic friction coefficient to be measured under conditions similar to those when the laminated sheet is attached to the skin and with the contactor close to the pad of the finger. Details of the measurement conditions for the dynamic friction coefficient are described in the Examples section.

[0022] A surface resin layer having a low dynamic friction coefficient measured under the above conditions tends to have a smooth feel. A surface resin layer having a high dynamic friction coefficient measured under the above conditions tends to have a moist feel. The smooth feel specifically means the feel felt when touching a non-moist smooth surface with the pad of a finger. The moist feel specifically means the feel felt when touching a moist surface with the pad of a finger.

[0023] The dynamic friction coefficient of the surface resin layer is 0.35 or more, preferably 0.36 or more, more preferably 0.37 or more. The dynamic friction coefficient of the surface resin layer is preferably 1.5 or less, more preferably 1.3 or less, even more preferably 1.0 or less, even more preferably 0.8 or less, particularly preferably 0.7 or less, 0.65 or less, 0.6 or less, or 0.55 or less. The dynamic friction coefficient of the surface resin layer is, for example, 0.35 or more and 1.5 or less. The touch of the surface resin layer having a dynamic friction coefficient of 0.35 or more tends to be close to the touch of the skin. If the dynamic friction coefficient is too high, the moist touch may be too strong compared to the skin, which may cause an uncomfortable feeling, but the surface resin layer having a dynamic friction coefficient of the above upper limit or less, particularly 1.0 or less, shows a moderately moist touch that is closer to the touch of the skin.

[0024] The surface resin layer has a maximum valley depth (Sv) of 30 μm or more. Sv is defined in ISO25178-2:2012. Sv means the absolute value of the maximum depth from the average surface of the surface.

[0025] The Sv of the surface resin layer is preferably 70 μm or less, more preferably 65 μm or less, even more preferably 60 μm or less, even more preferably 55 μm or less, particularly preferably 50 μm or less, 45 μm or less, or 40 μm or less. The Sv of the surface resin layer is, for example, 30 μm or more and 70 μm or less. A surface resin layer with a large Sv has a high cushioning property, and when checking the tactile sensation of the surface resin layer, the surface resin layer has a high ability to follow the pad of a finger, and therefore tends to have a strong moist tactile sensation.

[0026] The present inventors have found that even when the dynamic friction coefficient of the surface resin layer is 0.35 or more, the moist feel may not be sufficient, and even when the Sv of the surface resin layer is 30 μm or more, the moist feel may not be sufficient.The present inventors have found that when the dynamic friction coefficient of the surface resin layer is 0.35 or more and Sv is 30 μm or more, the surface resin layer has a highly moist feel and a feel similar to skin, and when the dynamic friction coefficient of the surface resin layer is 0.35 or more and 1.0 or less and Sv is 30 μm or more, the surface resin layer has a feel closer to skin.

[0027] The surface resin layer preferably has a three-dimensional surface texture as described below.

[0028] The surface resin layer preferably has an Ssk (skewness) of 0.0 or less and an Sku (kurtosis) of 2.6 or more. Ssk and Sku are each defined in ISO25178-2:2012.

[0029] Ssk is one of the three-dimensional surface texture parameters defined by the ISO, and is an index showing the degree of deviation of the height distribution from the average plane. When Ssk is 0, the surface shape is symmetrical with respect to the average plane, when Ssk exceeds 0, the surface shape is biased downward from the average plane, i.e., toward the lower side, and the vicinity of the top of the convex part tends to be sharp and thin, and when Ssk is less than 0, the surface shape is biased upward from the average plane, i.e., toward the higher side, and the vicinity of the top of the convex part tends to be blunt and thick. "Symmetrical with respect to the average plane" can also be called "normal distribution". The tendency of the shape exhibited by the surface shape indicated by Ssk will be explained with reference to FIG. 4. FIG. 4 is a schematic diagram of the case where Ssk exceeds 0 (1-1) and the case where Ssk is less than 0 (1-2). Ssk being less than 0 means that the surface shape of the surface resin layer is biased upward from the average plane, and the vicinity of the top of the convex part tends to be blunt and thick. In FIG. 4, the "average plane" is the average level plane corresponding to the horizontal line, and the "above the average plane" is also the above side in FIG.

[0030] Sku is one of the three-dimensional surface texture parameters defined by the ISO, and is an index indicating the degree of peaking of the height distribution from the average plane. When Sku is 3, the surface shape is symmetrical (normal distribution) with respect to the average plane, when Sku is less than 3, the height distribution tends to have a crushed shape, and when Sku is more than 3, the height distribution tends to have a peaked shape. The tendency of the shape exhibited by the surface shape indicated by Sku will be explained with reference to FIG. 5. FIG. 5 is a schematic diagram of a case where Sku is less than 3 (2-1) and a case where Sku is more than 3 (2-2). Sku being 2.6 or more means that the height distribution of the surface resin layer tends to have a shape that is not too greatly crushed. In FIG. 5, the "average plane" is the average level plane corresponding to the horizontal line, and the "upper side of the average plane" is also the upper side in FIG. 5.

[0031] The Ssk of the surface resin layer is preferably -1.5 or more, more preferably -1.0 or more, even more preferably -0.8 or more, even more preferably -0.65 or more, and particularly preferably -0.5 or more. The Ssk of the surface resin layer is preferably less than 0.0, more preferably -0.05 or less, even more preferably -0.1 or less, even more preferably -0.13 or less, and particularly preferably -0.15 or less. The Ssk of the surface resin layer is, for example, -1.5 or more and 0.0 or less.

[0032] The Sku of the surface resin layer is preferably 2.6 or more. The Sku of the surface resin layer is preferably 6.0 or less, more preferably 5.0 or less, even more preferably 4.0 or less, still more preferably 3.7 or less, and particularly preferably 3.4 or less. The Sku of the surface resin layer is, for example, 2.6 or more and 6.0 or less.

[0033] In addition to the dynamic friction coefficient and Sv being within the above ranges, a surface resin layer having Ssk of 0.0 or less and Sku of 2.6 or more tends to have a stronger moist feel and tends to have a feel closer to that of skin. For example, a surface resin layer having Ssk and Sku in the above-mentioned preferred ranges has a shape in the vicinity of the top of the convex portion present on the upper side relative to the average surface that is moderately crushed and rounded, and a shape in the vicinity of the lowest surface of the concave portion on the lower side that is gently pointed, and it is believed that such a shape contributes to a feel close to that of skin.

[0034] In this specification, Sv, Ssk, and Sku are measured using a shape analysis laser microscope. Sv, Ssk, and Sku are measured by attaching and fixing a laminated sheet to a Bioskin plate (manufactured by Viewlux Co., Ltd., product number P001-001) having an uneven surface so that the adhesive layer is in contact with the plate, and scanning the surface shape of the first surface of the surface resin layer using a shape analysis laser microscope. This allows Sv, Ssk, and Sku to be measured under conditions similar to those in which the laminated sheet is attached to the skin. Details of the measurement conditions for Sv, Ssk, and Sku are described in the Examples section.

[0035] The dynamic friction coefficients Sv, Ssk and Sku can be adjusted, for example, by appropriately selecting and using the material described later as the material for constituting the surface resin layer, and by subjecting the surface resin layer to a shaping treatment such as embossing. Specifically, the dynamic friction coefficient and the like can be adjusted by the surface shape of the embossing plate and the shaping sheet used in the embossing, the pressure, temperature and time during the embossing, and the like.

[0036] The surface resin layer may be a layer formed by thermal transfer, such as the protective layer or receiving layer described below, i.e., a transfer layer transferred by a thermal transfer process from a thermal transfer sheet having a transfer layer such as a protective layer and a receiving layer.

[0037] (base material layer) In one embodiment, the surface resin layer is a substrate layer. The substrate layer may be, for example, a resin film formed from a resin material, such as polyurethane, polyester, polyamide, polyimide, polyolefin, vinyl resin, styrene resin, acrylic resin, or cellulose resin.

[0038] As the base layer, for example, a stretchable base material is preferably used. Examples of the stretchable base material include the above-mentioned resin films, and among the above-mentioned resin films, a urethane film is preferable.

[0039] The stretchable substrate preferably has an elongation percentage of 30% or more and 100% or less so that it can follow the expansion and contraction of the adherend when the laminate sheet is attached to the adherend. The elongation percentage of the stretchable substrate is the elongation percentage obtained by a test method in accordance with JIS K 7127:1999. The elongation percentage is expressed by the following formula (1). Elongation rate (%) = 100 × (LL 0 ) / L 0 (1)

[0040] L in formula (1) is the length at which the elastic substrate breaks when the elastic substrate is pulled at a speed of 200 mm / min using a tensile tester. 0 is the length of the elastic substrate before being pulled by the tensile tester. A Tensilon universal material testing machine can be used as the tensile tester.

[0041] The substrate layer may contain an additive. Examples of the additive include an ultraviolet absorbing agent, a light stabilizer, an antioxidant, a colorant, a filler, and a release agent. The substrate layer may contain a colorant as necessary. The substrate layer may contain a colorant to match the color tone of the laminated sheet to a desired color, such as skin color. Examples of the colorant include a pigment and a dye.

[0042] The thickness of the substrate layer is preferably 3 μm or more, more preferably 5 μm or more. A laminate sheet having such a substrate layer can, for example, suppress the occurrence of wrinkles when the sheet is applied, and can improve workability. The thickness of the substrate layer is preferably 80 μm or less, more preferably 60 μm or less, even more preferably 40 μm or less, and particularly preferably 30 μm or less. A laminate sheet having such a substrate layer can, for example, suppress the discomfort of the user after the sheet is applied.

[0043] A printing layer may be provided on the substrate layer. The printing layer may be a layer for adjusting the color tone of the laminated sheet to a desired color such as skin color. The printing layer contains a colorant. Examples of the colorant include pigments and dyes.

[0044] In one embodiment, the laminate sheet of the present disclosure may include the above-mentioned base material layer between the adhesive layer and the surface resin layer. In this case, the surface resin layer may be, for example, a protective layer or a receiving layer described below.

[0045] (protective layer) In one embodiment, the surface resin layer is a protective layer. The laminate sheet of the present disclosure may, for example, include an adhesive layer, a base layer, and a protective layer in this order, or may include an adhesive layer, a base layer, a receiving layer on which an image is formed, and a protective layer in this order. The receiving layer will be described later.

[0046] The protective layer may be made of, for example, 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.

[0047] Examples of polyesters include polyethylene terephthalate and polyethylene naphthalate. Examples of vinyl resins include vinyl chloride-vinyl acetate copolymers, polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyvinyl acetal, and polyvinyl pyrrolidone. Examples of cellulose resins include ethyl cellulose, hydroxyethyl cellulose, ethyl hydroxycellulose, methyl cellulose, and cellulose acetate.

[0048] Examples of ionizing radiation curable resins include resins obtained by crosslinking and curing a radical polymerizable polymer or a radical polymerizable oligomer by exposure to ionizing radiation. Specific examples include resins obtained by adding a photopolymerization initiator to a radical polymerizable polymer or a radical polymerizable oligomer as necessary, and polymerizing and crosslinking the resulting polymer by exposure to an electron beam or ultraviolet light.

[0049] 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.

[0050] The protective layer may contain an additive. Examples of the additive include an ultraviolet absorbing agent, a light stabilizer, an antioxidant, a colorant, a filler, and a release agent. The protective layer may contain a colorant as 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 the colorant include pigments and dyes.

[0051] 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.

[0052] The thickness of the protective layer is preferably 0.1 μm or more, more preferably 0.5 μm or more, even more preferably 1 μm or more, and is preferably 20 μm or less, more preferably 10 μm or less, even more preferably 5 μm or less. Such a protective layer can, for example, provide a sufficient protective function to the laminated sheet. The thickness of the protective layer is, for example, 0.1 μm or more and 20 μm or less.

[0053] The protective layer can be formed, for example, by applying a coating liquid containing the above-mentioned materials to a base 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 applied coating.

[0054] 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 base film or the like corresponding to the base layer, and transferring the protective layer onto the base film or a receiving layer on which an image is formed by a thermal transfer process.

[0055] (Receptive layer) In one embodiment, the surface resin layer is a receiving layer on which an image is formed. The laminate sheet of the present disclosure may include, for example, an adhesive layer, a base layer, and a receiving layer on which an image is formed, in this order. The receiving layer is a layer for receiving dyes and the like transferred from a thermal transfer sheet. For example, when forming an image using a thermal transfer printer, it is desirable to provide a receiving layer on the base layer. The image may be, for example, an image for matching the color tone of the laminate sheet to a desired color, such as skin color.

[0056] The material constituting the receiving layer may be, for example, a resin material. Examples of the resin material include polyolefin, vinyl resin, styrene resin, acrylic resin, polyester, polyamide, polyimide, polyurethane, polycarbonate, cellulose resin, and ionomer resin. Examples of the polyolefin include polyethylene and polypropylene. Examples of the vinyl resin include polyvinyl chloride, polyvinyl acetate, and vinyl chloride-vinyl acetate copolymer. Examples of the polyester include polyethylene terephthalate and polyethylene naphthalate. The resin material constituting the receiving layer is preferably a vinyl resin, and more preferably a vinyl chloride-vinyl acetate copolymer.

[0057] The content of the resin material in the receiving layer is preferably 70% by mass or more, and more preferably 80% by mass or more, based on the total mass of the receiving layer, which can provide, for example, sufficient durability to the receiving layer.

[0058] The receiving layer may contain additives, such as ultraviolet absorbers, light stabilizers, antioxidants, colorants, fillers, and release agents.

[0059] The content of the additive in the receiving layer is preferably 1% by mass or more, more preferably 2% by mass or more, and preferably 30% by mass or less, more preferably 20% by mass or less, based on the total mass of the receiving layer. The content of the additive in the receiving layer is, for example, 1% by mass or more and 30% by mass or less.

[0060] The receiving layer may be a white receiving layer. The white receiving layer may, for example, include a primer layer containing a white pigment and a transparent receiving layer in this order. Examples of the white pigment include silica, titanium oxide, titanium dioxide, zinc oxide, cerium oxide, titanium mica, white mica, white carbon, calcium carbonate, barium sulfate, alumina white, and talc. By using the white receiving layer, it is possible to suppress reflected light from the discolored part of the adherend, increase the concealment of the discolored part, and improve the reproducibility of the desired skin color. The transparent receiving layer may contain particles that scatter light.

[0061] A concealing layer may be further provided on the primer layer containing the white pigment. The concealing layer may contain a metal pigment. Examples of the metal pigment include aluminum, nickel, chromium, brass, tin, brass, bronze, zinc, silver, platinum, gold, and oxides thereof, as well as particles of glass and the like that have been subjected to metal deposition. Among these, aluminum pigments are preferred from the viewpoint of transferability and glossiness of the concealing layer. The aluminum pigment may be of leafing type or non-leafing type, but non-leafing type is preferred from the viewpoint of transferability and glossiness of the concealing layer.

[0062] The thickness of the receiving layer is preferably 0.5 μm or more, more preferably 1 μm or more, and is preferably 20 μm or less, more preferably 10 μm or less. This can improve the density of the thermal transfer image formed on the receiving layer, for example. The thickness of the receiving layer is, for example, 0.5 μm or more and 20 μm or less.

[0063] The receiving layer can be formed, for example, by applying a coating liquid containing the above-mentioned materials to a base layer or the like by known means such as roll coating, reverse roll coating, gravure coating, reverse gravure coating, bar coating, and rod coating, and then drying the applied coating.

[0064] When a receiving layer is provided on a substrate layer, the substrate layer may be melted and damaged, denatured, or deformed by the solvent contained in the coating liquid during the process of applying and drying the coating liquid for the receiving layer on the substrate layer. In this case, it is preferable to transfer the receiving layer onto the substrate layer by thermal transfer. The receiving layer may be provided on the substrate layer in advance, or may be provided by thermal transfer onto the substrate layer during image formation.

[0065] <Adhesive layer> The laminated sheet of the present disclosure includes an adhesive layer. The adhesive layer is formed, for example, using an adhesive. An adhesive is also called a pressure-sensitive adhesive, and refers to a material that has adhesiveness at room temperature and can be attached to an adherend by applying pressure. For example, even when an adherend attached to the adhesive layer is peeled off, the adhesive layer retains a practical adhesive strength.

[0066] Examples of the adhesive include acrylic adhesives, urethane adhesives, silicone adhesives, rubber adhesives, vinyl alkyl ether adhesives, polyester adhesives, polyamide adhesives, and fluorine adhesives. The adhesive may contain a solvent. For example, either a water-based or solvent-based solvent can be used. For the adhesive, it is preferable to select an adhesive that is less likely to cause skin rash or irritation for medical use, and for example, acrylic adhesives and urethane adhesives are preferable.

[0067] The adhesive layer may contain an additive. Examples of the additive include an ultraviolet absorber, a light stabilizer, an antioxidant, a colorant, a filler, and a release agent. The adhesive layer may contain a colorant as necessary. The adhesive layer may contain a colorant to match the color tone of the laminated sheet to a desired color, such as skin color. Examples of the colorant include pigments and dyes.

[0068] The adhesive strength of the adhesive layer is preferably 5000gf / 50mm or less, more preferably 100gf / 50mm or more and 5000gf / 50mm or less. If the adhesive strength is 5000gf / 50mm or less, for example, there is little risk of damaging the adherend (particularly the skin of a human body or an animal) when the sheet is misattached or peeled off when replacing. If the adhesive strength is 100gf / 50mm or more, for example, the adhesive strength to the adherend (particularly the skin of a human body or an animal) can be secured, and peeling of the sheet due to sweating or movement of the skin can be suppressed.

[0069] The adhesive strength between the release sheet and the adhesive layer may be, for example, 2 gf / 50 mm or more, 4 gf / 50 mm or more, or 50 gf / 50 mm or less, or 30 gf / 50 mm or less. If the adhesive strength is 2 gf / 50 mm or more, for example, peeling of the release sheet during storage or transportation of the laminated sheet can be suppressed. If the adhesive strength is 50 gf / 50 mm or less, for example, the release sheet can be easily peeled off when using the skin design sheet. The adhesive strength is measured in accordance with the method (180° peeling) described in JIS Z 0237:2009.

[0070] The thickness of the adhesive layer is preferably 3 μm or more, more preferably 5 μm or more, and is preferably 40 μm or less, more preferably 30 μm or less. The thickness of the adhesive layer is, for example, 3 μm or more and 40 μm or less.

[0071] <Release sheet> The laminated sheet of the present disclosure may include a release sheet releasably provided on the adhesive layer. Examples of the release sheet include release paper with at least one side of a paper substrate being release-treated, and resin film with at least one side of a resin film being release-treated. Examples of the release treatment include release treatment using a release agent such as a silicone resin-based release agent, an alkyd resin-based release agent, a long-chain alkyl compound-based release agent, and a fluororesin-based release agent. Examples of the resin film include resin films formed from resin materials such as polyolefin, vinyl resin, styrene resin, acrylic resin, fluororesin, polyester, and polyamide.

[0072] The thickness of the release sheet is preferably 50 μm or more, more preferably 100 μm or more, and is preferably 300 μm or less, more preferably 200 μm or less. The thickness of the release sheet is, for example, 50 μm or more and 300 μm or less.

[0073] <Protective sheet> The laminated sheet of the present disclosure may include a protective sheet releasably provided on the surface resin layer. Examples of the protective sheet include a low-density polyethylene (LDPE) sheet and a polypropylene (PP) sheet. The protective sheet is provided with, for example, a weak adhesive layer. An acrylic weak adhesive and a urethane weak adhesive can be used to form the weak adhesive layer. The thickness of the protective sheet is, for example, not less than 10 μm and not more than 200 μm.

[0074] [Applications of laminated sheets] An example of the use of the laminate sheet of the present disclosure will now be described. In one embodiment, the laminate sheet can be used as a skin design sheet (skin sheet) for application to the skin. Examples of skin design sheets include skin concealing sheets and tattoo stickers.

[0075] In one embodiment, a skin design sheet can be produced from the laminated sheet. For example, a plurality of skin design sheets may be produced from the laminated sheet. For example, a roll-shaped laminated sheet may be cut to produce a sheet-shaped laminated sheet in the product form.

[0076] The skin design sheet can be applied to skin having spots, birthmarks, freckles, wrinkles, sagging skin, pores, scars, acne scars, burn scars, discoloration due to skin diseases, etc., with the adhesive layer in contact with the skin, thereby hiding these and making them less noticeable.

[0077] [Manufacturing method of laminated sheet] Laminated sheets of the present disclosure can be made, for example, by a thermal transfer process. A long base film corresponding to the base layer is prepared. The base film and the thermal transfer sheet are set in a thermal transfer printer. As the thermal transfer printer, a dye-sublimation type thermal transfer printer, which has excellent color reproducibility and gradation, is suitable.

[0078] The thermal transfer sheet comprises a substrate, a transfer type receiving layer, a dye layer and an optional protective layer, which are provided in face order on one side of the substrate. The receiving layer is a layer that receives the dye transferred from the thermal transfer sheet, and is transparent. Examples of the dye layer include a yellow dye layer, a magenta dye layer and a cyan dye layer. The dye layer contains a binder resin and a sublimation dye. Known materials can be used for the yellow dye layer, the magenta dye layer and the cyan dye layer. Details of the receiving layer and the protective layer are as described above. If a receiving layer is provided on the substrate film in advance, it is not necessary for the thermal transfer sheet to have a receiving layer, and it is not necessary to transfer the receiving layer as described below.

[0079] The thermal transfer printer has a thermal head and a platen roll that sandwich the base film and the thermal transfer sheet, and heats the thermal transfer sheet. The thermal head heats the transfer-type receiving layer to transfer the receiving layer onto the base film. Next, the thermal head sequentially heats the yellow dye layer, the magenta dye layer, and the cyan dye layer based on, for example, the data of the skin design sheet, and transfers the dye to the receiving layer transferred onto the base film to form an image. This makes it easy to match the color of the laminated sheet to the color of the user's skin. If necessary, the protective layer of the thermal transfer sheet is then heated, and the protective layer is transferred onto the receiving layer on which the image has been formed. Here, the receiving layer or (if a protective layer is provided) the protective layer corresponds to the above-mentioned surface resin layer.

[0080] If necessary, the surface resin layer is subjected to a shaping process such as embossing to form a concave-convex shape on the surface resin layer. The above-mentioned dynamic friction coefficient, Sv, Ssk and Sku of the surface resin layer can be adjusted by the shaping process. For example, an embossing plate or a shaping sheet can be used in the embossing process. The embossing plate and the shaping sheet can be used without any particular restriction as long as they can impart the above-mentioned surface shape. The surface shape of the embossing plate and the shaping sheet and the surface shape shaped by them are almost the opposite shapes.

[0081] The long laminate sheet is cut parallel to the width direction of the laminate sheet by a cutter in a thermal transfer printer to obtain a single laminate sheet. A protective sheet may be attached to the surface resin layer of the single laminate sheet, if necessary.

[0082] Next, the laminated sheet is cut into a shape of the product form of the skin design sheet using a known cutting device. For example, the laminated sheet is punched into a circular shape when viewed from above. The shape is not particularly limited.

[0083] In this manner, a skin design sheet having a desired shape can be produced. In the above method, the adhesive layer may be provided on the substrate film before the thermal transfer process. In this case, it is preferable to provide a release sheet on the adhesive layer. Alternatively, the adhesive layer may be provided on the substrate film after the thermal transfer process.

[0084] Although the method for producing a laminate sheet by a thermal transfer process has been described, the method for producing a laminate sheet of the present disclosure is not limited to the above method. For example, a laminate sheet may be produced by forming each layer in sequence.

[0085] The present disclosure relates to, for example, the following [1] to [8]. [1] A laminate sheet comprising an adhesive layer and a surface resin layer, wherein the surface resin layer has a dynamic friction coefficient of 0.35 or more as measured using a static and dynamic friction measuring device equipped with a finger model tactile contactor, and an Sv (maximum valley depth) as defined in ISO25178-2:2012 of 30 μm or more. [2] The laminate sheet according to [1], wherein the dynamic friction coefficient is 0.35 or more and 1.5 or less. [3] The laminate sheet according to [1], wherein the dynamic friction coefficient is 0.35 or more and 1.0 or less. [4] The laminate sheet according to any one of [1] to [3], wherein the surface resin layer has an Ssk (skewness) of 0.0 or less and an Sku (kurtosis) of 2.6 or more, as defined in ISO25178-2:2012. [5] The laminate sheet according to any one of [1] to [4], wherein the laminate sheet comprises a base material layer as the surface resin layer, or the laminate sheet further comprises a base material layer between the adhesive layer and the surface resin layer. [6] The laminate sheet according to any one of the above [1] to [5], wherein the surface resin layer is a layer formed by thermal transfer. [7] The laminate sheet according to any one of [1] to [6], further comprising a protective sheet releasably provided on the surface resin layer, and / or a release sheet releasably provided on the adhesive layer. [8] The laminate sheet according to any one of [1] to [7] above, which is a skin design sheet. EXAMPLES

[0086] The laminate sheet of the present disclosure will be described in more detail with reference to examples, but the laminate sheet of the present disclosure is not limited to these examples.

[0087] [Example 1] An acrylic adhesive was applied onto a release paper (Sumika Kakoshi Co., Ltd., SLB-110WT, thickness 170 μm) and dried to form an adhesive layer with a thickness of 10 μm. A urethane film with a thickness of 20 μm (Okura Kogyo Co., Ltd., NES85, elastic substrate) was attached to the adhesive layer. In this way, a sheet having a release paper, an adhesive layer, and a urethane film in this order was produced.

[0088] A thermal transfer sheet was prepared having a 2 μm thick transfer layer made of vinyl chloride-vinyl acetate copolymer (Nissin Chemical Industry Co., Ltd., Solvine (registered trademark) CNL) on a 4.5 μm thick polyethylene terephthalate film (Toray Industries, Inc.). The transfer layer from this thermal transfer sheet was thermally transferred onto the urethane film of the above sheet under the following transfer conditions. Synthetic leather release paper "DN-TP (registered trademark) DE-43" (Dai Nippon Printing Co., Ltd.) was prepared. After thermal transfer, the synthetic leather release paper was layered on the transfer layer and heated at a temperature of 150 ° C. with a laminating machine "Fujipla LPD3226N" (Hisago Co., Ltd.) to form irregularities on the surface of the transfer layer. In this way, a laminated sheet was obtained that had a release paper, an adhesive layer, a urethane film, and a transfer layer. (Transfer conditions) Thermal head: KGT-217-12MPL20 (Kyocera Corporation) Heating element average resistance: 31915Ω - Print density in the main scanning direction: 300 dpi Sub-scanning print density: 300 dpi ·Applied power: 0.12W / dot 1 line cycle: 5msec. ·Printing start temperature: 40℃

[0089] [Examples 2 to 4] The laminated sheets of Examples 2 to 4 were obtained by forming projections and recesses on the surface of the transfer layer in the same manner as in Example 1, except that the release paper for synthetic leather was changed to DE-73M ​​(Example 2), DE-89 (Example 3), or DE-145 (Example 4) from the DE series of "DN-TP (registered trademark)" (Dai Nippon Printing Co., Ltd.).

[0090] [Example 5] A thermal transfer sheet was prepared having a 2 μm thick protective layer made of 20 parts by mass of polyester (Elite (registered trademark) UE-3380, Unitika Co., Ltd.) and 6 parts by mass of polyester (Elite (registered trademark) UE-3210, Unitika Co., Ltd.) on a 4.5 μm thick polyethylene terephthalate film (Toray Co., Ltd.). The protective layer was thermally transferred from this thermal transfer sheet onto the urethane film of the sheet prepared in Example 1 under the above transfer conditions. Synthetic leather release paper "DN-TP (registered trademark) DE-43" (Dai Nippon Printing Co., Ltd.) was prepared. After thermal transfer, the synthetic leather release paper was layered on the protective layer and heated at a temperature of 150 ° C. in the laminating machine to form unevenness on the surface of the protective layer. In this way, a laminated sheet was obtained that had a release paper, an adhesive layer, a urethane film, and a protective layer.

[0091] [Examples 6 to 8] In Examples 1 to 3, the synthetic leather release paper was overlaid on the transfer layer and heated at a temperature of 130°C in the laminator, and the same procedures were followed as in Examples 1 to 3 to form irregularities on the surface of the transfer layer, thereby obtaining a laminated sheet of Example 6 corresponding to Example 1, a laminated sheet of Example 7 corresponding to Example 2, and a laminated sheet of Example 8 corresponding to Example 3, respectively.

[0092] [Examples 9 to 12] The release paper for synthetic leather used in Examples 1 to 4 was overlaid on the urethane film of the sheet having the release paper, adhesive layer, and urethane film prepared in Example 1 in this order, and heated at a temperature of 150° C. in the laminating machine to form irregularities on the surface of the urethane film. In this way, a laminated sheet of Example 9 corresponding to Example 1, a laminated sheet of Example 10 corresponding to Example 2, a laminated sheet of Example 11 corresponding to Example 3, and a laminated sheet of Example 12 corresponding to Example 4 were obtained, respectively.

[0093] [Comparative Examples 1 to 3] In Examples 1 to 3, the synthetic leather release paper was overlaid on the transfer layer and heated at 100°C in the laminator, and the same procedures were followed as in Examples 1 to 3 to form irregularities on the surface of the transfer layer, thereby obtaining a laminate sheet of Comparative Example 1 corresponding to Example 1, a laminate sheet of Comparative Example 2 corresponding to Example 2, and a laminate sheet of Comparative Example 3 corresponding to Example 3, respectively.

[0094] [evaluation] <Sensory evaluation> A Bioskin plate (Viewlux Corporation, product number P001-001) was prepared. The laminated sheets obtained in the Examples and Comparative Examples were attached and fixed to the Bioskin plate after removing the release paper, and the feel (moist feel) of the surface of the laminated sheet was evaluated. The evaluation was performed on a 5-point scale, and the average value of the evaluations by 5 people was recorded. The order of feel closest to skin is 3>2>4>1 in the following evaluation. 1: Smooth to the touch 2: Slightly moist to the touch 3: Moist texture (similar to skin texture) 4. Feels moister than skin

[0095] <Kinematic friction coefficient> The laminated sheets obtained in the Examples and Comparative Examples were attached and fixed to the Bioskin plate after removing the release paper, and a static / dynamic friction measuring device equipped with a tactile contact was attached to measure the dynamic friction coefficient under the following conditions. The dynamic friction coefficient was calculated from the average value of the dynamic friction force / load in the 20-30 mm section. Static and dynamic friction measuring device: Trinity Lab i-tester TL201Ts Contact: Trinity Lab's tactile contact finger model Test environment: 23℃, 50% RH Load: 10g Test speed: 10mm / s Test range: 30mm

[0096] <Surface shape (Sv, Ssk and Sku)> The laminated sheets obtained in the Examples and Comparative Examples were attached and fixed to the Bioskin plate after removing the release paper, and the surface shape of the laminated sheet, Sv (maximum valley depth), Ssk (skewness) and Sku (kurtosis), were measured under the following conditions using a shape analysis laser microscope in accordance with ISO25178-2: 2012. The surface shape of the attached surface of the laminated sheet on the Bioskin plate was Sv: 47.2 μm, Ssk: -0.50, Sku: 2.70. Shape analysis laser microscope: VK-X150 (control unit) / VK-X160 (measurement unit), Keyence Corporation Objective lens: 20x Laser wavelength: 658nm Measurement mode: Surface profile mode Measurement pitch: 0.13μm Measurement range: Rectangular (952μm×1297μm) Measurement quality: high precision

[0097] [Table 1] [Explanation of symbols]

[0098] 1 Laminated sheet 10 Surface resin layer 20 Adhesive layer 30 Base material layer 40 Release sheet

Claims

1. A laminated sheet having an adhesive layer and a surface resin layer, the laminated sheet being used as a skin design sheet to be attached to the skin, The surface resin layer has a dynamic friction coefficient of 0.35 to 1.5 as measured using a static and dynamic friction measuring device (i-tester TL201Ts, Trinity Lab Co., Ltd.) equipped with a finger model tactile contactor, and has a maximum valley depth (Sv) of 30 μm or more as defined in ISO25178-2:2012. Laminated sheet.

2. The laminate sheet according to claim 1 , wherein the surface resin layer is a layer formed by thermal transfer.

3. A laminated sheet comprising an adhesive layer and a surface resin layer formed by thermal transfer, The surface resin layer has a dynamic friction coefficient of 0.35 to 1.5 as measured using a static and dynamic friction measuring device (i-tester TL201Ts, Trinity Lab Co., Ltd.) equipped with a finger model tactile contactor, and has a maximum valley depth (Sv) of 30 μm or more as defined in ISO25178-2:2012. Laminated sheet.

4. The laminate sheet according to any one of claims 1 to 3, wherein the dynamic friction coefficient is 0.35 or more and 1.0 or less.

5. The laminate sheet according to any one of claims 1 to 3, wherein the surface resin layer has an Ssk (skewness) of 0.0 or less and an Sku (kurtosis) of 2.6 or more as defined in ISO25178-2:2012.

6. The laminate sheet according to any one of claims 1 to 3, wherein the laminate sheet comprises a base material layer as the surface resin layer, or the laminate sheet further comprises a base material layer between the adhesive layer and the surface resin layer.

7. a protective sheet provided releasably on the surface resin layer, and / or A release sheet releasably provided on the adhesive layer; The laminate sheet according to any one of claims 1 to 3, further comprising:

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