Laminated sheet and skin design sheet

Abstract

To provide a laminated sheet which looks natural in appearance when stuck to the skin, is excellent in the expression of a pattern, and can be used as a skin design sheet.SOLUTION: A laminated sheet comprising at least an adhesive layer and a base material layer, wherein a contrast ratio (YB / YW) measured from a front surface side of the base material layer and obtained by a testing method in accordance with JISK5600 4-1 is 5% or more and 40% or less, and in a stress-strain curve obtained by a tensile test in accordance with JIS K7127 1999 (test piece breadth: 10mm), a tensile stress at a strain of 50% is 5 MPa or more and 160MPa or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a laminated sheet and a skin-design sheet. [Background technology]

[0002] Skin design sheets that are applied to the skin are known. 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, applying the adhesive layer to the skin, and then peeling the protective sheet from the base layer.

[0003] Skin-design sheets are required to have a natural appearance with reduced shine so that the attached area is not noticeable when attached to the skin (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7167692 Summary of the Invention [Problem to be solved by the invention]

[0005] Another example of a skin design sheet is a body paint sticker. The body paint sticker is a sheet on which various designs are printed on a substrate. The body paint sticker is sold, for example, at variety stores, sporting and music event venues, amusement parks, etc., and is used to enhance the atmosphere.

[0006] The skin design sheets used in such body paint stickers are required to adhere closely to the skin while showing the skin color and to properly express the image, so that the appearance when applied to the skin looks natural.

[0007] An object of the present disclosure is to provide a laminated sheet that has a natural appearance when applied to the skin, is excellent in the expression of patterns, and can be used as a skin design sheet. Another object of the present disclosure is to provide a skin design sheet that has a natural appearance when attached to the skin and is excellent in the expression of patterns. [Means for solving the problem]

[0008] The laminate sheet of the present disclosure includes at least an adhesive layer and a base layer, The hiding ratio (YB / YW) of the laminated sheet measured from the surface side of the base material layer by a test method in accordance with JIS K5600-4-1 is 5% or more and 40% or less, In a stress-strain curve obtained by a tensile test of the laminated sheet in accordance with JIS-K 7127:1999 (test piece width: 10 mm), the tensile stress at 50% strain is 5 MPa or more and 160 MPa or less. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a laminated sheet that can be used as a skin-design sheet, which has a natural appearance when attached to the skin and is excellent in expressing patterns. Furthermore, according to the present disclosure, it is possible to provide a skin design sheet that has a natural appearance when attached to the skin and is excellent in expressing patterns. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view of a laminated sheet according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described in detail. The present disclosure can be implemented in many different forms, and should not be construed as being limited to the description of the following exemplary embodiments. For clarity of explanation, the drawings may show the width, thickness, shape, etc. of each layer more schematically than in the embodiments, but these are merely examples and do not limit the interpretation of the present disclosure. In this specification and each drawing, elements similar to those already described with reference to the previous drawings are designated by the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0012] 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 constructed by combining any one upper limit candidate with any one lower limit candidate. Examples of such parameters include physical properties, component content, and layer thickness. As an example, the following statement will be explained: "Parameter B is preferably A1 or greater, more preferably A2 or greater, and even more preferably A3 or greater. Parameter B is preferably A4 or less, more preferably A5 or less, and even more preferably A6 or less." In this example, the numerical range of parameter B may be A1 or greater and A4 or less, A1 or greater and A5 or less, A1 or greater and A6 or less, A2 or greater and A4 or less, A2 or greater and A5 or less, A2 or greater and A6 or less, A3 or greater and A4 or less, A3 or greater and A5 or less, or A3 or greater and A6 or less.

[0013] In this specification, each of the components (for example, resin materials and additives such as colorants) appearing in the following description may be used alone or in combination of two or more types.

[0014] [Laminated sheet] The laminate sheet of the present disclosure includes at least an adhesive layer and a base layer. The laminate sheet may further include a release sheet on the surface of the adhesive layer opposite to the surface facing the base layer. The laminate sheet may include a release sheet, an adhesive layer, and a base layer in this order in the thickness direction, as necessary.

[0015] Specific examples of the laminate sheet of the present disclosure will be described below with reference to the drawings. The laminate sheet 1 shown in Fig. 1 includes a release sheet 10, an adhesive layer 20, and a base layer 30, arranged in this order in the thickness direction. In this example, one or both surfaces of the base layer 30 may be colored with a colorant to a desired color, such as a skin color. A printed layer (not shown) may be provided on one or both surfaces of the base layer 30.

[0016] The laminate sheet may further include a receiving layer (not shown) on the base layer. The laminate sheet may include an adhesive layer, a base layer, and a receiving layer in this order in the thickness direction.

[0017] The laminate sheet may further include a concealing layer (not shown) between the base layer and the receiving layer. The laminate sheet may include an adhesive layer, a base layer, a concealing layer, and a receiving layer in this order in the thickness direction.

[0018] The laminate sheet may further include an adhesive layer (not shown) between the base layer and the concealing layer. The laminate sheet may include a pressure-sensitive adhesive layer, a base layer, an adhesive layer, a concealing layer, and a receiving layer in this order in the thickness direction.

[0019] The laminate sheet may further include a protective layer (not shown) on the base layer. The laminate sheet may include an adhesive layer, a base layer, an adhesive layer, a concealing layer, a receiving layer, and a protective layer in this order in the thickness direction. In these examples, an image of a desired color, such as flesh color, may be formed on the receiving layer 30 using a coloring agent such as a dye.

[0020] The laminate sheet may further include a protective sheet (not shown) on the surface of the base layer opposite to the surface facing the adhesive layer, as needed. The laminate sheet may include, in this order, a release sheet, an adhesive layer, a base layer, an adhesive layer, a concealing layer, a receiving layer on which an image is formed, a protective layer, and, as needed, a protective sheet.

[0021] In one embodiment, the laminate sheet of the present disclosure is in the form of a long strip, and FIG. 1 is a cross-sectional view of, for example, a laminate sheet 1 taken perpendicular to the longitudinal direction.

[0022] <Base material layer> The laminate sheet of the present disclosure includes 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. The base layer may contain a biodegradable plastic as a resin material, or may contain a polylactic acid-based resin.

[0023] The content of the resin material in the base layer is preferably 60% by mass or more and 100% by mass or less, more preferably 70% by mass or more and 100% by mass or less. Increasing the content of the resin material in the base layer can increase the concealment ratio of the laminate sheet and the tensile stress at 50% strain in the stress-strain curve obtained by a tensile test of the laminate sheet, as described below. Decreasing the content of the resin material in the base layer can decrease the concealment ratio of the laminate sheet and the tensile stress at 50% strain in the stress-strain curve obtained by a tensile test of the laminate sheet, as described below.

[0024] 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, polyvinyl chloride (PVC) films, urethane films, olefin films, and polyethylene films are preferred, and resin films containing polyvinyl chloride (PVC) or polyurethane as the resin material are more preferred.

[0025] The stretchable substrate preferably has an elongation percentage of 30% or more 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 × (L - L0) / L0 (1)

[0026] In formula (1), L is the length at which the stretchable substrate breaks when it is pulled at a speed of 100 mm / min using a tensile tester. L0 in formula (1) is the length of the stretchable substrate before being pulled by the tensile tester. A Tensilon universal material testing machine can be used as the tensile tester.

[0027] The substrate layer may contain additives. Examples of additives include ultraviolet absorbers, light stabilizers, antioxidants, colorants, fillers, and release agents. The substrate layer may contain a colorant, if 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 colorants include pigments and dyes.

[0028] The substrate layer 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 substrate layer may contain one or more white pigments.

[0029] The substrate layer may further contain a pearl pigment. Examples of pearl pigments 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. 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 various pearl pigments coated with a colored pigment. 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.

[0030] The content of the white pigment in the base layer 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. Increasing the content of the white pigment in the base layer increases the hiding power of the laminate sheet, as described below, and the tensile stress at 50% strain in the stress-strain curve obtained by a tensile test of the laminate sheet. Decreasing the content of the white pigment in the hiding layer decreases the hiding power of the laminate sheet, as described below, and the tensile stress at 50% strain in the stress-strain curve obtained by a tensile test of the laminate sheet.

[0031] The thickness of the substrate layer is preferably 20 μm or more, more preferably 30 μm or more. A laminate sheet having a substrate layer with a thickness of 20 μm or more can, for example, suppress the occurrence of wrinkles when the sheet is applied. Furthermore, a laminate sheet having a substrate layer with a thickness of 30 μm or more can easily peel off and apply the release sheet from the laminate sheet without causing the substrate layer (sticker paper) to become twisted, thereby improving workability. The thickness of the substrate layer is preferably 150 μm or less, more preferably 100 μm or less. As will be described later, a laminate sheet including such a substrate layer can easily adjust the hiding ratio of the laminate sheet and the tensile stress at 50% strain in a stress-strain curve obtained by a tensile test of the laminate sheet.

[0032] A printing layer may be provided on the base 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.

[0033] <Adhesive layer> The laminated sheet of the present disclosure includes an adhesive layer. The adhesive layer is formed using, for example, a pressure-sensitive adhesive. A pressure-sensitive adhesive is a material that has adhesive properties 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 practical adhesive strength.

[0034] Examples of adhesives include acrylic adhesives, urethane adhesives, silicone adhesives, rubber adhesives, vinyl alkyl ether adhesives, polyester adhesives, polyamide adhesives, and fluorine-based adhesives. The adhesive may contain a solvent. For example, either a water-based or solvent-based solvent can be used. For medical use, it is preferable to select an adhesive that causes little skin rash or irritation to the skin, and for example, acrylic adhesives and urethane adhesives are preferred.

[0035] The adhesive layer may contain additives. Examples of additives include ultraviolet absorbers, light stabilizers, antioxidants, colorants, fillers, and release agents. The adhesive layer may contain a colorant, if 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 colorants include pigments and dyes.

[0036] The adhesive strength of the adhesive layer is preferably 5000 gf / 50 mm or less, more preferably 100 gf / 50 mm or more and 5000 gf / 50 mm or less. If the adhesive strength is 5000 gf / 50 mm or less, there is little risk of damaging the adherend (particularly human or animal skin) when the sheet is applied incorrectly or removed during replacement. If the adhesive strength is 100 gf / 50 mm or more, for example, adhesive strength to the adherend (particularly human or animal skin) can be ensured, and peeling of the sheet due to sweating, movement, etc. can be prevented.

[0037] The thickness of the adhesive layer is preferably 3 μm or more, more preferably 5 μm or more, and 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.

[0038] (Release sheet) The laminated sheet of the present disclosure may be provided with a release sheet. In one embodiment, the laminate sheet may include a release sheet, an adhesive layer, and a substrate layer in this order.

[0039] Examples of release sheets include release paper with at least one release-treated surface of a paper substrate and resin films with at least one release-treated surface of a resin film. Examples of release treatments include treatments using release agents such as silicone resin-based release agents, alkyd resin-based release agents, long-chain alkyl compound-based release agents, and fluororesin-based release agents. Examples of resin films include resin films formed from resin materials such as polyolefin, vinyl resin, styrene resin, acrylic resin, fluororesin, polyester, and polyamide.

[0040] The thickness of the release sheet is preferably 50 μm or more, more preferably 100 μm or more, and 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.

[0041] (receptor layer) The laminate sheet of the present disclosure may also include a receiving layer on the substrate layer opposite the adhesive layer. In one embodiment, the laminate sheet may include an adhesive layer, a base layer, and a receiving layer in this order in the thickness direction.

[0042] The receiving layer is a layer for receiving dyes and the like transferred from the thermal transfer sheet. For example, when forming an image using a printer, the image may be formed on a receiving layer previously provided on the substrate layer, or the image may be formed on a receiving layer provided on the transfer sheet, and then the substrate layer may be transferred via a concealing layer (described later). The image may be, for example, an image for adjusting the color tone of the laminated sheet to a desired color, such as skin color.

[0043] 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.

[0044] 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, relative to the total mass of the receiving layer, which can provide the receiving layer with sufficient durability, for example.

[0045] The receiving layer may contain additives such as ultraviolet absorbers, light stabilizers, antioxidants, colorants, fillers, and release agents.

[0046] 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.

[0047] The thickness of the receptor layer is preferably 0.3 μm or more, more preferably 0.5 μm or more, and even more preferably 0.8 μm or more. The thickness of the receptor layer is preferably 10.0 μm or less, more preferably 5.0 μm or less, and even more preferably 2.0 μm or less. If the thickness of the receptor layer is above the lower limit, sufficient print density cannot be obtained. On the other hand, if the thickness of the receptor layer is below the upper limit, the conformability when applied to the skin is insufficient, and a sense of unity with the skin cannot be obtained.

[0048] When a receiving layer is provided on a substrate layer in advance, the substrate layer may be melted and damaged, or may be denatured or deformed by the solvent contained in the coating liquid during the process of applying and drying a 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.

[0049] (Concealment layer) The laminate sheet of the present disclosure may further include a concealing layer (not shown) between the substrate layer and the receiving layer. In one embodiment, the laminate sheet may include an adhesive layer, a base layer, a hiding layer, and a receiving layer in this order in the thickness direction.

[0050] The hiding layer may be a white primer layer containing a white pigment and a resin material. 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 hiding layer may contain one or more white pigments.

[0051] The content of the white pigment in the concealing 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. Here, increasing the content of the white pigment in the concealing layer can increase the concealing ratio of the laminate sheet described below. On the other hand, decreasing the content of the white pigment in the concealing layer can decrease the concealing ratio of the laminate sheet described below.

[0052] The hiding layer may further contain a pearl pigment. As the pearl pigment, the same ones as those mentioned above for the base layer can be used.

[0053] 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 hiding layer can contain one or more resin materials.

[0054] The hiding 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 hiding layer-forming coating solution 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 hiding layer.

[0055] From the viewpoint of improving adhesion to the base layer when the concealing layer is transferred onto the base layer, the concealing layer preferably contains a vinyl resin, more preferably a vinyl chloride-vinyl acetate copolymer. The vinyl resin content in the concealing layer is preferably 0.3% by mass to 10% by mass, more preferably 0.5% by mass to 5% by mass. This allows the concealing layer to maintain its thermal transferability while further improving its adhesion to the base layer.

[0056] The hiding layer preferably contains polyester from the viewpoint of improving adhesion to the base layer. The content of polyester in the hiding 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 allows the hiding layer to maintain thermal transferability while further improving adhesion to the base layer.

[0057] The content of the resin material in the hiding layer is preferably 10% by mass to 70% by mass, more preferably 10% by mass to 50% by mass, which can prevent re-aggregation of the white pigment and provide high hiding power.

[0058] The hiding layer may contain additives. Examples of additives include fillers, plasticizers, antistatic agents, UV absorbers, release agents, and dispersants. The hiding layer can contain one or more additives.

[0059] The thickness of the hiding 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 hiding layer is preferably 6 μm or less, more preferably 5 μm or less, and even more preferably 4 μm or less. Here, increasing the thickness of the hiding layer can hide the color of the base. On the other hand, decreasing the thickness of the hiding layer can reduce the hiding rate of the laminate sheet described below.

[0060] The concealing layer can be formed, for example, by applying a coating liquid obtained by dispersing or dissolving the components described above in a suitable solvent onto the substrate layer or any layer provided on the substrate of the transfer sheet using the known coating method described above, and drying the coating liquid.

[0061] (adhesive layer) The laminated sheet of the present disclosure may include an adhesive layer. In one embodiment, the laminate sheet may include an adhesive layer between the base layer and the concealing layer, which can improve adhesion between the base layer and the concealing layer when the concealing layer provided on the transfer sheet is transferred to the base layer.

[0062] The adhesive layer preferably contains a resin material. Examples of the resin material include (meth)acrylic resin, vinyl resin, polyolefin, polyester, polyurethane, epoxy resin, urea resin, melamine resin, and phenol resin. The adhesive layer can contain one or more resin materials.

[0063] The content of the resin material in the adhesive layer is preferably 70% by mass or more and 100% by mass or less, and more preferably 80% by mass or more and 100% by mass or less.

[0064] The adhesive layer may be a layer obtained by curing a resin material with a curing agent, such as an isocyanate compound, an aliphatic amine, a cyclic aliphatic amine, an aromatic amine, or an acid anhydride.

[0065] The thickness of the adhesive layer is preferably 0.1 μm or more, more preferably 0.5 μm or more, and preferably 10 μm or less, more preferably 2 μm or less. The thickness of the adhesive layer is, for example, 0.1 μm or more and 10 μm or less.

[0066] The adhesive 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 onto the hiding layer by the known coating method described above and dried.

[0067] (protective layer) The laminate sheet of the present disclosure may be provided with a protective layer. In one embodiment, the laminated sheet may comprise an adhesive layer, a base layer, a concealing layer, a receiving layer, and a protective layer in this order, or may comprise a base layer, a concealing layer, a receiving layer on which an image is formed, and a protective layer in this order.

[0068] 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.

[0069] 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 polyvinyl pyrrolidone. Examples of cellulose resins include ethyl cellulose, hydroxyethyl cellulose, ethylhydroxycellulose, methyl cellulose, and cellulose acetate.

[0070] 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.

[0071] 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, relative to the total mass of the protective layer, which can provide, for example, sufficient durability to the protective layer.

[0072] 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.

[0073] 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, relative to 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.

[0074] 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 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, impart sufficient protective function to the laminate sheet. The thickness of the protective layer is, for example, 0.1 μm or more and 20 μm or less.

[0075] 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.

[0076] 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 layer, and transferring the protective layer onto the receiving layer or the receiving layer on which an image is formed by a thermal transfer process.

[0077] (protective sheet) The laminate sheet of the present disclosure may include a protective sheet releasably disposed on the substrate layer. Examples of protective sheets include low-density polyethylene (LDPE) sheets, polypropylene (PP) sheets, glycol-modified polyethylene terephthalate (PET-G), cast polypropylene, polyvinyl chloride (PVC), and thermoplastic polyurethane (TPU). The protective sheet may include, for example, a weak adhesive layer. The weak adhesive layer may be formed using an acrylic-based weak adhesive or a urethane-based weak adhesive. The thickness of the protective sheet is, for example, 10 μm or more and 200 μm or less.

[0078] <Laminated sheet> The laminate sheet of the present disclosure has a hiding ratio (YB / YW) of 5% to 40% and preferably 10% to 35% when measured from the surface side of the base layer of the laminate sheet (excluding any release sheet and protective sheet) using a test method in accordance with JIS K5600-4-1. A hiding ratio of 5% or more allows a design to be properly displayed when the laminate sheet is applied to the skin, for example, as a body paint sticker. Furthermore, a hiding ratio of 40% or less allows the laminate sheet to be moderately transparent, allowing the bare skin color to be seen, resulting in a more natural appearance when applied to the skin, for example, as a body paint sticker.

[0079] Furthermore, the laminate sheet of the present disclosure is prepared by subjecting the laminate sheet (excluding any release sheet and protective sheet) to a 10 mm wide test piece and a stress-strain curve obtained by a tensile test in accordance with JIS-K 7127:1999, in which the tensile stress at 50% strain is 5 MPa or more and 160 MPa or less. If the tensile stress is within the above range, the laminate sheet stretches appropriately when applied to the skin, providing an excellent feeling of adhesion when applied to the skin. Furthermore, when printing on the laminate sheet, the sheet stretching can be suppressed, resulting in excellent pattern expression.

[0080] The total thickness of the laminate sheet of the present disclosure, which has an adhesion layer and a substrate layer as essential components and an adhesive layer, a hiding layer, a receiving layer on which an image is formed, and a protective layer as optional components, 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 laminate sheet is, for example, 20 μm or more and 150 μm or less. When the total thickness of the laminate sheet is within the above range, the hiding ratio of the laminate sheet and the tensile stress at 50% strain in the stress-strain curve obtained by a tensile test of the laminate sheet tend to satisfy the above-mentioned requirements.

[0081] [Applications of laminated sheets] An example of the use of the laminate sheet of the present disclosure will be described below. In one embodiment, the laminate sheet can be used as a skin design sheet (skin sheet) to be attached to the skin by forming an image on the receptor layer. Examples of skin design sheets include skin concealing sheets, tattoo stickers, and body paint stickers.

[0082] In one embodiment, a skin design sheet can be produced from the laminate sheet. For example, multiple skin design sheets may be produced from the laminate sheet. For example, a roll-shaped laminate sheet may be cut to produce a sheet-shaped laminate sheet in the form of a product.

[0083] When the skin design sheet is used as, for example, a body paint sticker, by sticking it so that the adhesive layer is in contact with the skin of the user, the laminated sheet becomes moderately transparent, allowing the color of the bare skin to be seen, resulting in a more natural appearance and allowing the design to be clearly visible.

[0084] Furthermore, when creating a skin design sheet by on-demand printing of any design onto the laminated sheet, the stretch of the laminated sheet is adjusted, allowing the design to be faithfully reproduced to the original image. This allows the skin design sheet to look more natural when applied to the user's skin.

[0085] [Manufacturing method of skin design sheet] The skin design sheet of the present disclosure can be produced, for example, by a thermal transfer process. A long substrate film corresponding to the laminate sheet of the present disclosure is prepared. The substrate film may be provided with a release sheet. This substrate film and a thermal transfer sheet are set in a thermal transfer printer.

[0086] The thermal transfer sheet comprises a substrate and a transferable receptor layer, a dye layer, and optionally a protective layer, which are provided in surface order on one side of the substrate. The receptor layer is a transparent layer that receives the dye transferred from the thermal transfer sheet. 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 sublimable dye. Known materials can be used for the yellow dye layer, the magenta dye layer, and the cyan dye layer. Details of the receptor layer and the protective layer are as described above. When printing directly onto the substrate layer or when a receptor layer is previously provided on the substrate film, it is not necessary for the thermal transfer sheet to have a receptor layer, or for the receptor layer to be transferred as described below.

[0087] The thermal transfer printer includes a thermal head and platen roll that sandwich the substrate film and thermal transfer sheet, heating the thermal transfer sheet. The thermal head heats the receptor layer of the transfer mold, transferring the receptor layer onto the substrate film. Next, the thermal head sequentially heats the yellow dye layer, magenta dye layer, and cyan dye layer, for example, based on the data of the skin design sheet, transferring the dyes to the receptor layer transferred onto the substrate film to form an image. This allows any image to be printed on the laminate sheet. If necessary, the protective layer of the thermal transfer sheet is then heated, transferring the protective layer onto the receptor layer on which the image has been formed.

[0088] If necessary, the surface of the base film may be subjected to a shaping process such as embossing to form a concave-convex shape. 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 restrictions. The surface shape of the embossing plate and the shaping sheet and the surface shape shaped by them are almost the inverse of each other.

[0089] The long laminate sheet is cut parallel to the width direction of the laminate sheet using a cutter in a thermal transfer printer to obtain a single laminate sheet. If necessary, a protective sheet may be attached to the surface resin layer of the single laminate sheet.

[0090] Next, the laminated sheet is cut into the shape of the product form of the skin design sheet using a known cutting device. For example, when the laminated sheet is viewed from above, the laminated sheet is punched into a circular shape. The shape is not particularly limited.

[0091] 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 after the thermal transfer process. In this case, it is preferable to provide a release sheet after the adhesive layer is formed.

[0092] Although a method for manufacturing a skin design sheet by a thermal transfer process has been described, the method for manufacturing a skin design sheet of the present disclosure is not limited to the above method. For example, a skin design sheet may be manufactured by sequentially forming each layer of a laminated sheet.

[0093] Furthermore, in the method for producing the skin-design sheet of the present disclosure, an embodiment using a thermal transfer printer (thermal printer) has been described, but the present invention is not limited to this. The printer may be a thermal transfer printer, an inkjet printer, etc. Among these, a thermal transfer printer is preferable. As the thermal transfer printer, a dye-sublimation type thermal transfer printer is suitable, as it has excellent color reproducibility and gradation.

[0094] [1] A laminated sheet comprising at least an adhesive layer and a base layer, The hiding ratio (YB / YW) measured from the surface side of the base material layer by a test method in accordance with JIS K5600-4-1 is 5% or more and 40% or less, A laminated sheet in which the tensile stress at 50% strain is 5MPa or more and 160MPa or less in the stress-strain curve obtained by a tensile test (test piece width: 10mm) in accordance with JIS-K 7127:1999. [2] The laminate sheet according to [1], wherein the base layer contains 60% by mass or more and 100% by mass or less of a resin material. [3] The laminate sheet according to [2], wherein the resin material is polyvinyl chloride (PVC) or polyurethane. [4] The laminate sheet according to any one of [1] to [3], wherein the thickness of the substrate layer is 20 μm or more and 150 μm or less. [5] The laminate sheet according to any one of [1] to [4], wherein the hiding ratio (YB / YW) is 10% or more and 35% or less. [6] The laminate sheet according to any one of [1] to [5], wherein the substrate layer contains a white pigment. [7] It provides an additional layer of concealment. The laminate sheet according to any one of [1] to [6], wherein the hiding layer contains a white pigment. [8] The laminate sheet according to any one of [1] to [7], further comprising a receiving layer on the opposite side of the base layer to the adhesive layer. [9] The laminate sheet according to any one of [1] to [8], further comprising a release sheet on the adhesive layer opposite to the base layer.

[10] A skin-design sheet comprising the laminated sheet according to any one of [1] to [9]. [Example]

[0095] 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. In the following description, "parts" means "parts by mass."

[0096] Example 1 A 70 μm thick polyvinyl chloride film with a white pigment added to adjust the hiding power to 11.4% was prepared as the substrate layer. A 10 μm thick adhesive layer was formed on one side of the substrate layer using an acrylic adhesive (SK Dyne MD-1, manufactured by Soken Chemical & Engineering Co., Ltd.). In this way, a laminated sheet with a total thickness of 80 μm was produced, with a layer structure of adhesive layer (10 μm) / substrate layer (70 μm).

[0097] <Example 2> A laminated sheet having a total thickness of 80 μm was prepared in the same manner as in Example 1, except that the amount of white pigment added to the base layer was adjusted to a hiding power of 23.7%.

[0098] Example 3 A laminated sheet having a total thickness of 80 μm was prepared in the same manner as in Example 1, except that the amount of white pigment added to the base layer was adjusted to a hiding power of 38.4%.

[0099] Example 4 A laminated sheet with a total thickness of 82 μm was produced in the same manner as in Example 1, except that the following coating liquid for forming a concealing layer was applied to a polyvinyl chloride film to which no white pigment had been added as a base layer, and dried to form a concealing layer with a thickness of 1.0 μm, and then the coating liquid for forming a receiving layer was applied to the polyvinyl chloride film to which no white pigment had been added, and dried to form a receiving layer with a thickness of 1.0 μm.

[0100] "Coating liquid for forming a concealing layer" Titanium dioxide 58 parts (Ishihara Sangyo Kaisha, Ltd., R-780) (Meth)acrylic resin 10.5 parts (Mitsubishi Chemical Corporation, Dianall (registered trademark) BR-87) (Meth)acrylic resin 31.5 parts (Mitsubishi Chemical Corporation, Dianale (registered trademark) BR-85) Methyl ethyl ketone (MEK) 100 parts 100 parts toluene

[0101] "Coating liquid for forming the receiving layer" Vinyl chloride-vinyl acetate copolymer 100 parts (1000A, manufactured by Denki Kagaku Kogyo Co., Ltd.) Epoxy-modified silicone 3.5 parts (X-22-3000T, manufactured by Shin-Etsu Chemical Co., Ltd.) Methylstyrene-modified silicone 3.5 parts (X-24-510, manufactured by Shin-Etsu Chemical Co., Ltd.) Polyether-modified silicone 2.5 parts (FZ2101, manufactured by Nippon Unicar Co., Ltd.) 200 parts methyl ethyl ketone (MEK) 200 parts toluene

[0102] <Example 5> A laminated sheet with a total thickness of 83 μm was produced in the same manner as in Example 4, except that a polyvinyl chloride film to which no white pigment was added was coated with a coating liquid for forming a concealing layer and dried to form a concealing layer with a thickness of 2.0 μm.

[0103] Example 6 A laminate sheet having a total thickness of 60 μm was prepared in the same manner as in Example 1, except that the substrate layer had a thickness of 50 μm and was adjusted to a hiding power of 12.0% by adding a white pigment.

[0104] Example 7 A laminated sheet having a total thickness of 110 μm was prepared in the same manner as in Example 1, except that the substrate layer had a thickness of 100 μm and was adjusted to a hiding power of 13.5% by adding a white pigment.

[0105] Example 8 A laminated sheet with a total thickness of 50 μm was produced in the same manner as in Example 1, except that a coating liquid for forming a concealing layer was applied to a 30 μm thick polyurethane film with no added white pigment as the base layer, and dried to form a 1.0 μm thick concealing layer, and a coating liquid for forming a receiving layer was applied to the same and dried to form a 9.0 μm thick receiving layer.

[0106] <Comparative Example 1> A laminate sheet having a total thickness of 70 μm was prepared in the same manner as in Example 1, except that the amount of white pigment was not added to the base layer.

[0107] <Comparative Example 2> A laminated sheet having a total thickness of 80 μm was prepared in the same manner as in Example 1, except that the amount of white pigment added to the base layer was adjusted to a hiding power of 96.8%.

[0108] <Comparative Example 3> A laminated sheet having a total thickness of 60 μm was prepared in the same manner as in Example 1, except that the substrate layer had a thickness of 50 μm and was adjusted to a hiding power of 96.8% by adding a white pigment.

[0109] <Comparative Example 4> A laminate sheet having a total thickness of 37 μm was produced in the same manner as in Example 4, except that the base layer was changed to a polyethylene terephthalate film having a thickness of 25 μm.

[0110] <Comparative Example 5> A laminated sheet having a total thickness of 112 μm was produced in the same manner as in Example 4, except that the base layer was changed to a polyethylene terephthalate film having a thickness of 100 μm.

[0111] <Comparative Example 6> A laminated sheet having a total thickness of 42 μm was produced in the same manner as in Example 8, except that a receiving layer having a thickness of 1.0 μm was formed as the substrate layer.

[0112] <Comparative Example 7> A laminate sheet having a total thickness of 62 μm was produced in the same manner as in Comparative Example 6, except that the base layer was changed to a polyurethane film having a thickness of 30 μm and not containing a white pigment.

[0113] [Measurement method] <Concealment rate of laminated sheet> The hiding power (YB / YW) of the laminated sheet was determined using a test method in accordance with JIS K5600-4-1 (hiding power: for light color paints). Specifically, in the laminated sheets of Examples 1 to 8 and Comparative Examples 1 to 7, the adhesive layer formed on one side of the base layer was attached 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.

[0114] <Tensile stress when laminated sheet strain is 50%> The tensile stress at a strain of 50% was determined from the "stress-strain curve (SS curve)" obtained by a test method conforming to JIS-K 7127:1999.

[0115] Stress-strain curve The "stress-strain curve" was obtained by a tensile test in accordance with JIS-K 7127:1999 and JIS K7161. The tensile test was carried out using a small tabletop tester (EZ Test series, manufactured by Shimadzu Corporation) as a measuring instrument, and measurements were carried out on the laminate sheets of Examples 1 to 8 and Comparative Examples 1 to 7 under the measurement conditions shown below. (Measurement conditions) Test piece: Type 2, width 10 mm Initial chuck spacing: 50mm Test speed: 100mm / min Uses a 500N load cell

[0116] <Rating 1> The laminated sheets of Examples 1 to 8 and Comparative Examples 1 to 7 were evaluated for 50% elongation from the obtained stress-strain curves. The results are shown in Table 1. (Evaluation criteria) ○: 50% elongation ×: Not stretchable by 50%

[0117] <Rating 2> The tensile stress σ at a strain of 50% was calculated from the obtained stress-strain curves for the laminate sheets of the above-mentioned Examples 1 to 8 and Comparative Examples 1 to 7. The results are shown in Table 1.

[0118] [Evaluation method] The laminate sheets of Examples 1 to 8 and Comparative Examples 1 to 7 were used to carry out the following evaluations.

[0119] <Transparency of skin> Regarding the "skin transparency" when the laminate sheet was applied to the skin, five evaluators attached the laminate sheet to the skin and performed a sensory evaluation, and the evaluation was performed according to the following evaluation criteria. (Evaluation criteria) ◎: All five judged the transparency to be good. ○: 3 to 4 people judged the transparency to be good. ×A: Three or more people judged the transparency to be poor (too transparent). ×B: Three or more people judged that the transparency was poor (not transparent).

[0120] <Adhesion to the skin> Regarding the "adhesion to the skin" when the laminate sheet was applied to the skin, five evaluators attached the laminate sheet to the skin and performed a sensory evaluation, and the evaluation was performed according to the following evaluation criteria. (Evaluation criteria) ○: Three or more people judged that there was no discomfort when the patch was applied (it adhered well). ×: Three or more people judged that the patch felt uncomfortable when applied (not adhered well).

[0121] <Printer cuttability> The adhesive layer of the laminated sheet was bonded to the release layer of the release sheet described below so that they were in contact with each other to create a seal-type thermal transfer image-receiving sheet. The seal-type thermal transfer image-receiving sheet was set in a thermal transfer printer (DS620, manufactured by Dai Nippon Printing Co., Ltd.) and cut into five sheets using the thermal transfer printer's cutter. The printer cuttability was evaluated according to the following evaluation criteria.

[0122] (How to create a release sheet) A release layer coating liquid having the following composition was applied to one surface of the release sheet substrate and dried to form a release layer with a thickness of 0.25 μm. A back primer layer coating liquid having the following composition was applied to the other surface of the release sheet substrate and dried to form a back primer layer with a thickness of 0.1 μm. A back layer coating liquid having the following composition was applied to the back primer layer and dried to form a back layer with a thickness of 0.5 μm, thereby producing a release sheet in which a release layer was provided on one surface of the substrate and a back layer was provided on the other surface of the release portion substrate in this order.

[0123] "Base material" 100μm thick white polyethylene terephthalate film (Crisper (registered trademark) K1212 Toyobo Co., Ltd.)

[0124] "Release layer coating liquid" ·Addition polymerization agent silicone 100 parts (KS847H Shin-Etsu Chemical Co., Ltd.) 200 parts toluene

[0125] "Coating liquid for back primer layer" 100 parts urethane resin (OPT Primer Showa Ink Industrial Co., Ltd.) Isocyanate hardener 5 parts (OPT hardener, Showa Ink Industrial Co., Ltd.) 240 parts methyl ethyl ketone 240 parts ethyl acetate 240 parts toluene

[0126] "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 30 parts isopropyl alcohol

[0127] (Evaluation criteria) 〇: All five sheets were cut. ×: One or more sheets could not be cut.

[0128] The evaluation results are shown in Table 1.

[0129] [Table 1] [Explanation of symbols]

[0130] 1. Laminated sheet 10 Release sheet 20 Adhesive layer 30 Base material layer

Claims

1. A laminated sheet comprising at least an adhesive layer and a base layer, a hiding ratio (YB / YW) measured from the surface side of the base material layer by a test method in accordance with JIS K5600-4-1 is 5% or more and 40% or less; A laminated sheet in which the tensile stress at a strain of 50% 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.

2. The laminate sheet according to claim 1 , wherein the base layer contains 60% by mass or more and 100% by mass or less of a resin material.

3. The laminated sheet according to claim 2 , wherein the resin material is polyvinyl chloride (PVC) or polyurethane.

4. The laminate sheet according to claim 1 , wherein the thickness of the substrate layer is 20 μm or more and 150 μm or less.

5. The laminate sheet according to claim 1, wherein the hiding ratio (YB / YW) is 10% or more and 35% or less.

6. The laminate sheet according to claim 1 , wherein the substrate layer comprises a white pigment.

7. It provides an additional layer of concealment, The laminate sheet according to claim 1 , wherein the hiding layer comprises a white pigment.

8. The laminated sheet according to claim 1 , further comprising a receiving layer on the opposite side of the substrate layer from the adhesive layer.

9. The laminated sheet according to claim 1 , further comprising a release sheet on the adhesive layer opposite the base layer.

10. A skin design sheet comprising the laminate sheet according to any one of claims 1 to 9.

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