Solid decorative sheet

Abstract

To provide a solid decorative sheet to be subjected to heat-molding, capable of suppressing generation of air bubbles as much as possible, and excellent in a design quality.SOLUTION: A solid decorative sheet 10 includes: a film layer 1 comprising a transparent substrate having a heat distortion temperature of 50-130°C; a design layer 2 comprising a design printed on the rear face of the film layer 1; an optically transparent adhesive layer 3 containing an optically transparent adhesive and disposed on the design layer 2; and a base layer 4 disposed on the optical transparent adhesive layer 3 and comprising a base substrate having a heat distortion temperature of 50-130°C. The solid decorative sheet which is heat-molded at a low temperature of 130°C or less is such that: a refractive index of the optical transparent adhesive layer 3 is 1.4-1.5; a haze value of the optical transparent adhesive layer 3 is 1.0% or less; and a whole light transmittance of the optical transparent adhesive layer 3 is 85-100%.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a three-dimensional decorative sheet and a method for manufacturing the same, and more particularly to a three-dimensional decorative sheet used by attaching it to an article or the like in order to attach a design to a three-dimensional shaped article or the like.

Background Art

[0002] In order to attach a design to a three-dimensional shaped article, a three-dimensional decorative sheet having a design layer is used. Specifically, a decorative sheet having a design layer is heat-molded along the outer shape of the portion of the article where the design is to be attached, and this is used as a three-dimensional three-dimensional decorative sheet, which is attached to the article to attach a design to the article.

[0003] As such a three-dimensional decorative sheet, for example, a transparent resin film having two main surfaces, a transparent resin layer provided on the first main surface of the transparent resin film, a pattern printing layer disposed on the transparent resin layer, and a colored base film provided on the second main surface of the transparent resin film, the transparent resin layer contains first beads, the pattern printing layer contains second beads, the first beads are different from the second beads in terms of their content rate, color, and / or particle size, and a molded article (three-dimensional decorative sheet) in which the first beads and the second beads are embedded in the transparent resin layer and the pattern printing layer and is heat-molded into a three-dimensional curved surface shape is known (see, for example, Patent Document 1). In addition, a three-dimensional processing decorative sheet having a base material layer containing a polyester resin and a coloring agent, a printing pattern layer composed of a coloring ink laminated on the base material layer and composed of a binder mainly composed of a vinyl chloride-vinyl acetate copolymer, and a transparent layer composed of a polyester resin laminated on the printing pattern layer is known (see, for example, Patent Document 2). In such a decorative sheet, it is possible to obtain a decorative sheet (three-dimensional decorative sheet) subjected to three-dimensional processing such as R processing or curved surface processing into a desired shape. Also, there is known a decorative sheet attached to the three-dimensional shape surface of an article, which has a molded integrated structure having a three-dimensional shape corresponding to the three-dimensional shape surface of the article. The molded integrated structure includes a decorative film layer having a front surface and a back surface, a shape-maintaining film layer provided on the back surface side of the decorative film layer for maintaining the three-dimensional shape, a contact surface facing the three-dimensional shape surface of the article, and a first adhesive layer provided on at least a part of the contact surface. A decorative sheet (three-dimensional decorative sheet) in which the front surface of the decorative film layer is a printed surface is known (see, for example, Patent Document 3).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the conventional three-dimensional decorative sheets including the three-dimensional decorative sheets described in Patent Documents 1 to 3 above, there is a problem that bubbles are generated during heat molding. For this reason, in the conventional three-dimensional decorative sheets, it is necessary to select a design in which the bubbles are not conspicuous, and there are limitations in the selection of the design. Incidentally, because of the problem that bubbles are generated, generally, a method of directly providing a design on an article has been adopted instead of using a three-dimensional decorative sheet.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a three-dimensional decorative sheet that can suppress the generation of bubbles as much as possible and has excellent design quality in a three-dimensional decorative sheet subjected to heat molding.

Means for Solving the Problems

[0007] As a result of intensive studies, the present inventors considered that the temperature of thermoforming and the adhesive might be related to the generation of bubbles. On the premise of thermoforming at a low temperature, a base material that undergoes thermal deformation at a low temperature is adopted, and an optically transparent adhesive used in a display or a touch panel is deliberately adopted for the decorative sheet, and it has been found that the above problems can be solved, leading to the completion of the present invention.

[0008] The present invention relates to a three-dimensional decorative sheet having a three-dimensional shape, which includes a film layer made of a transparent base material having a heat distortion temperature of 50 to 130°C, a design layer made of a design printed on the back surface of the film layer, an optically transparent adhesive layer including an optically transparent adhesive provided on the design layer, and a base layer made of a base material having a heat distortion temperature of 50 to 130°C provided on the optically transparent adhesive layer. The refractive index of the optically transparent adhesive layer is 1.4 to 1.5, the haze value of the optically transparent adhesive layer is 1.0% or less, the total light transmittance of the optically transparent adhesive layer is 85 to 100%, and it is a three-dimensional decorative sheet that is thermoformed at a low temperature of 130°C or lower.

[0009] In the three-dimensional decorative sheet of the present invention, the material of the transparent base material is microcrystalline polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene, biopolycarbonate, polylactic acid, polyethylene terephthalate or polymethyl methacrylate, the optically transparent adhesive contains a (meth)acrylic polymer, a silicone polymer or an acrylic-modified silicone polymer, the material of the base substrate is microcrystalline polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene, biopolycarbonate, polylactic acid, polyethylene terephthalate or polymethyl methacrylate, and the saturated water absorption rate of the optically transparent adhesive layer is preferably 0.3 to 2.5% by weight.

[0010] The present invention relates to a three-dimensional decorative sheet having a three-dimensional shape, comprising a film layer made of a transparent base material with a heat distortion temperature of 50 to 130°C, a design layer composed of a design printed on the back surface of the film layer, a first optically transparent adhesive layer including a first optically transparent adhesive provided on the design layer, a vapor deposition film layer composed of a vapor deposition film in which a metal is vapor-deposited on an intermediate base material with a heat distortion temperature of 50 to 130°C provided on the first optically transparent adhesive layer, a second optically transparent adhesive layer including a second optically transparent adhesive provided on the vapor deposition film layer, and a base layer composed of a base material with a heat distortion temperature of 50 to 130°C provided on the second optically transparent adhesive layer. The refractive indices of both the first optically transparent adhesive layer and the second optically transparent adhesive layer are 1.4 to 1.5, the haze values of the first optically transparent adhesive layer and the second optically transparent adhesive layer are 1.0% or less, the total light transmittance of the first optically transparent adhesive layer and the second optically transparent adhesive layer is 85 to 100%, and it is a three-dimensional decorative sheet that is heat-molded at a low temperature of 130°C or lower.

[0011] In the three-dimensional decorative sheet of the present invention, it is preferable that the vapor deposition film has a metal vapor-deposited on the front side of the intermediate base material.

[0012] In the three-dimensional decorative sheet of the present invention, the material of the transparent base material is microcrystalline polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene, biopolycarbonate, polylactic acid, polyethylene terephthalate or polymethyl methacrylate, the first optically transparent adhesive contains a (meth)acrylic polymer, a silicone polymer or an acrylic-modified silicone polymer, the material of the intermediate base material is microcrystalline polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene, biopolycarbonate, polylactic acid, polyethylene terephthalate or polymethyl methacrylate, the metal is aluminum, tin or indium, the second optically transparent adhesive contains a (meth)acrylic polymer, a silicone polymer or an acrylic-modified silicone polymer, the material of the base base material is microcrystalline polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene, biopolycarbonate, polylactic acid, polyethylene terephthalate or polymethyl methacrylate, and the saturation water absorption rates of the first optically transparent adhesive layer and the second optically transparent adhesive layer are preferably 0.3 to 2.5% by weight.

[0013] In the three-dimensional decorative sheet of the present invention, it is preferable that the design layer is composed of a design printed on the back surface of the film layer by waterless offset printing.

[0014] The present invention is a method for manufacturing a three-dimensional decorative sheet, comprising a printing step of printing a design on the back surface of a sheet-like transparent base material by waterless offset printing to obtain a printed matter, a laminating step of laminating the back surface of the printed matter and a base base material via an optically transparent adhesive to obtain a pre-laminated body, and a molding step of putting the pre-laminated body into a molding machine and heat-molding it into a desired shape at a low temperature of 130°C or lower.

[0015] The manufacturing method of a three-dimensional decorative sheet according to the present invention includes a printing step of printing a design on the back surface of a sheet-like transparent substrate by waterless offset printing to obtain a printed matter, an adhesive body manufacturing step of applying a first optically transparent adhesive to the front surface of a vapor deposition film and a second optically transparent adhesive to the back surface of the vapor deposition film to obtain an optical film adhesive body, a lamination step of laminating the back surface of the printed matter and a base substrate via the optical film adhesive body to obtain a pre-laminated body, and a molding step of putting the pre-laminated body into a molding machine and heat-molding it into a desired shape at a low temperature of 130°C or lower.

Advantages of the Invention

[0016] In the three-dimensional decorative sheet of the present invention, since a transparent substrate and a base substrate with a heat distortion temperature of 50 to 130 degrees, or a transparent substrate, an intermediate substrate, and a base substrate are adopted, it can be made into a heat-molded product even at a low temperature of 130°C or lower. Thereby, the generation of bubbles can be suppressed. Incidentally, in the three-dimensional decorative sheet, the temperature of heat molding is usually carried out at about 200 or higher.

[0017] In the three-dimensional decorative sheet of the present invention, since there is an optically transparent adhesive layer on the back surface side of the design layer, the generation of bubbles can be further suppressed. The reason why the generation of bubbles can be suppressed by providing the optically transparent adhesive layer is not clear, but it is considered that the optically transparent adhesive contained in the optically transparent adhesive layer suppresses the vaporization expansion of water and residual solvents. Note that the reason is not limited to this. Also, the same applies when a first optically transparent adhesive layer is adopted instead of the optically transparent adhesive layer.

[0018] In the three-dimensional decorative sheet of the present invention, by providing an optically transparent adhesive layer having a refractive index, a haze value, and a total light transmittance within the above ranges, compared with the case of using an adhesive layer made of a normal adhesive that is not an optically transparent adhesive, it becomes clearer and has more depth. That is, the quality of the design of the three-dimensional decorative sheet can be further improved. Although the reason for the quality improvement is not clear, the three-dimensional decorative sheet has a design layer and is not transparent. However, when the light passing through the design layer reaches the optically transparent adhesive layer, the optically transparent adhesive layer does not impede the progress of light as much as possible and also suppresses light scattering as much as possible. Therefore, it is considered to be the reason. Note that the reason is not limited to this. The same applies when a first optically transparent adhesive layer is used instead of the optically transparent adhesive layer.

[0019] In the three-dimensional decorative sheet of the present invention, by adopting the above-mentioned materials as the materials of the transparent base material, the optically transparent adhesive, and the base substrate, in addition to excellent moldability at low temperatures, it also has excellent versatility. Therefore, it can be manufactured with energy saving and relatively low cost. In addition, the generation of bubbles can be surely suppressed, and the quality of the design can also be surely improved. At this time, in the three-dimensional decorative sheet, by setting the saturation water absorption rate of the optically transparent adhesive layer containing such an optically transparent adhesive within the above range, excess moisture is not drawn in, and a small amount of moisture remaining in the three-dimensional decorative sheet is absorbed. Therefore, it is possible to suppress the cause of bubbles.

[0020] In addition, when further provided with a vapor deposition film layer, by adopting the above-mentioned materials as the materials of the intermediate substrate and the metal, the same effects as above are achieved, and the expression range of the design, such as making it metallic or mirror-like, is widened, and it is possible to give a more luxurious feeling.

[0021] In the three-dimensional decorative sheet of the present invention, when provided with a vapor deposition film layer, the vapor deposition film is formed by vapor-depositing a metal on the front side of the intermediate substrate. During heat molding, the first optically transparent adhesive having fluidity is pressed against the metal side of the vapor deposition film. Therefore, the first optically transparent adhesive penetrates between the metal particles on the surface of the vapor deposition film, and the two are more closely adhered at the interface. As a result, the generation of bubbles can be suppressed and the quality can also be improved.

[0022] In the three-dimensional decorative sheet of the present invention, by forming the design layer as a layer of a design printed by waterless offset printing, it is possible to express a precise and three-dimensional design. In addition, since so-called dampening water is not used, it is possible to eliminate the possibility of dampening water mixing into the design layer and remaining in the design layer. It is also considered that the remaining dampening water in the design layer is one of the causes of foaming. In addition, since dampening water is not used during printing, there is almost no waste liquid, which is environmentally friendly.

[0023] In the manufacturing method of the three-dimensional decorative sheet of the present invention, since the above-described three-dimensional decorative sheet can be manufactured, the same effects as described above can be achieved. In addition, in the manufacturing method of the three-dimensional decorative sheet, a printed matter is once produced, and the back surface of the printed matter and the base substrate are bonded via an optically transparent adhesive. At this time, since the design of the printed matter and the optically transparent adhesive come into contact with each other, it is possible to further suppress the generation of bubbles at the interface between the two.

[0024] When using an optical film adhesive, a printed matter and an optical film adhesive are once produced, and the back surface of the printed portion and the base substrate are bonded via an optical film adhesive having a first optically transparent adhesive applied to the surface and a second optical adhesive applied to the back surface. At this time, since the design of the printed matter and the first optically transparent adhesive come into contact with each other, and the vapor-deposited metal and the first optically transparent adhesive come into contact with each other, it is possible to further suppress the generation of bubbles at these interfaces.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

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Figure 6

Figure 7

Mode for Carrying Out the Invention

[0026] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary. In the drawings, the same elements will be denoted by the same reference numerals, and redundant descriptions will be omitted. Also, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the ratios shown.

[0027] The three-dimensional decorative sheet according to the present invention is obtained by three-dimensionally molding a laminate on which a design is drawn, and is used by being attached to an article having a three-dimensional shape in order to attach a design to the article. Note that the shape of the three-dimensional decorative sheet is not particularly limited and may be molded according to the shape of the article to which it is to be adhered. In addition, such articles are not particularly limited, and examples thereof include home appliances, vehicle interiors, cosmetic cases, beauty appliances, gaming machines, and the like. In this specification, a design is an image composed of a pattern, a color, or a combination thereof, and a design layer means a layer on which an image is formed (a layer including an image).

[0028] (First Embodiment) FIG. 1 is a perspective view schematically showing a first embodiment of the three-dimensional decorative sheet according to the present invention. Note that FIG. 1 is a view in which an article B shown by a broken line is made transparent. As shown in FIG. 1, the three-dimensional decorative sheet 10 according to the first embodiment has an Ω-shaped cross section and includes a kamaboko-shaped main body portion A1 and base portions A2 extending horizontally from both ends of the main body portion A1, respectively. A design picture T is drawn on the front surface side of the main body portion A1 of the three-dimensional decorative sheet 10, and all portions other than the design picture T on the front surface sides of the main body portion A1 and the base portions A2 are solid colors. That is, in the three-dimensional decorative sheet 10, the designs of the design picture T and the solid color are drawn.

[0029] The three-dimensional decorative sheet 10 is attached to an article B having a protruding portion B1, which is disposed on the back surface side thereof. As a result, the article B is in a state where a design is attached to its surface. Note that the method of attaching the three-dimensional decorative sheet 10 to the article B is not particularly limited. For example, it can be attached by adhesion or pasting.

[0030] FIG. 2 is an enlarged cross-sectional view schematically showing a portion P of the three-dimensional decorative sheet shown in FIG. 1. In FIG. 2, the description of the object B is omitted. As shown in FIG. 2, the three-dimensional decorative sheet 10 according to the first embodiment is a so-called laminate in which a plurality of layers are laminated. That is, the three-dimensional decorative sheet 10 includes a film layer 1, a design layer 2 provided on the back surface of the film layer 1, an optically transparent adhesive layer 3 provided on the back surface of the design layer 2, and a base layer 4 provided on the back surface of the optically transparent adhesive layer 3. In the three-dimensional decorative sheet 10, the film layer 1 side is the front side, and the base layer 4 side is the back side. That is, the back surface of the base layer 4 comes into contact with the object B.

[0031] In the three-dimensional decorative sheet 10, the film layer 1 is a layer made of a transparent base material. The transparent base material is transparent or translucent itself so that the design layer 2 provided on the back surface can be visually recognized from the front surface side. In addition, the transparent substrate may be subjected to functional processing such as water repellent processing, antistatic processing, matte processing, satin finish processing, antibacterial processing, embossing processing, sandblasting processing, hologram processing, etc. on its surface side, and a functional film such as a water repellent film, an antistatic film, a matte film, a satin finish film, an antibacterial film, an embossing film, a hologram film, etc. may be further laminated on its surface side.

[0032] The film layer 1 has a thickness of 100 to 300 μm. If the thickness of the film layer 1 is less than 100 μm, the dimensional stability is inferior compared to the case where the thickness is within the above range, so it becomes difficult to provide the design layer. If the thickness exceeds 300 μm, the weight becomes larger compared to the case where the thickness is within the above range, resulting in a decrease in handleability and a disadvantage that the heat conduction during molding deteriorates.

[0033] The transparent substrate is selected to have a heat distortion temperature of 50 to 130°C. Also, from the viewpoint of heat resistance, it is preferable to select one having a heat distortion temperature of 70 to 130°C. Here, the heat distortion temperature refers to the temperature at which the plastic deflects by a certain amount or more when the temperature is gradually increased while a load is applied to the plastic. Note that the heat distortion temperature is also called the load deflection temperature. If the heat distortion temperature is less than 50°C, the heat resistance of the three-dimensional decorative sheet 10 may be insufficient. If the heat distortion temperature exceeds 130°C, there is a drawback that bubbles are likely to occur.

[0034] In the transparent substrate, examples of the material include microcrystalline polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile butadiene styrene (ABS), polyamide 6 (PA6), polyamide 66 (PA66), polyphenylene sulfide (PPS), polyphenylene oxide (PPO), polylactic acid (PLA), polyglycolic acid (PGA), polytetrafluoroethylene (PTFE), polyacrylonitrile (PAN), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polymethyl methacrylate (PMMA), polyethylene furanoate (PEF), biopolycarbonate (PC), etc.

[0035] Among these, from the viewpoints of versatility, strength, and molding processability, the material of the transparent substrate preferably adopts microcrystalline polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile butadiene styrene (ABS), polylactic acid (PLA), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), or biopolycarbonate (PC). Also, from the viewpoint of environmental friendliness, the material of the transparent substrate preferably adopts biodegradable films such as polylactic acid (PLA) and polyglycolic acid (PGA), and biomass films such as polyethylene furanoate (PEF) and biopolycarbonate (PC). Furthermore, based on these, it is more preferable to adopt polylactic acid (PLA) or biopolycarbonate (PC) as the material of the transparent substrate.

[0036] In the three-dimensional decorative sheet 10, the design layer 2 is a layer composed of a design printed on the back surface of the film layer 1. Note that the design layer 2 may be formed over the entire back surface of the film layer 1 or may be formed partially. The printing method of the design is not particularly limited, and offset printing, gravure printing, flexographic printing, letterpress printing, screen printing, inkjet printing, transfer, etc. can be adopted. Among these, it is preferable to adopt offset printing for the design layer 2, which enables precise and three-dimensional design expression and also enables mass printing.

[0037] Moreover, among offset printing methods, it is more preferable to adopt waterless offset printing. That is, it is preferable that the design layer 2 is a layer of a design printed by waterless offset printing. Since waterless offset printing does not use so-called dampening water, it is possible to eliminate the possibility of dampening water remaining in the design layer 2. As a result, it is possible to suppress the occurrence of foaming caused by dampening water during thermoforming. In addition, waterless offset printing has the advantage of being environmentally friendly with almost no waste liquid because it does not use dampening water.

[0038] In waterless offset printing, it is preferable to adopt UV-curable or EB-curable ink as the ink. UV-curable ink does not contain water contained in aqueous ink, nor does it contain petroleum solvents and volatile organic solvents contained in oil-based ink. Therefore, when UV-curable ink is adopted, it is possible to eliminate the possibility of a large amount of water, organic solvents, etc. remaining in the design layer 2.

[0039] In the three-dimensional decorative sheet 10, the optically transparent adhesive layer 3 is provided on the back surface of the design layer 2 and is a layer containing an optically transparent adhesive as a main component. Thus, in the three-dimensional decorative sheet 10, since the optically transparent adhesive layer 3 is provided on the back surface side of the design layer 2, the generation of bubbles can be further suppressed.

[0040] The refractive index of the optically transparent adhesive layer 3 is 1.4 to 1.5. The haze value of the optically transparent adhesive layer 3 is 1.0% or less, preferably 0.8% or less. The total light transmittance of the optically transparent adhesive layer 3 is 85 to 100%, preferably 90 to 100%.

[0041] Here, the refractive index of the optically transparent adhesive layer 3 is a value measured in accordance with JIS-K7142-1996. The haze value of the optically transparent adhesive layer 3 is a value measured in accordance with JIS-K7136. Specifically, an optically transparent adhesive is applied to the surface of glass with a haze value of 0.1% to a thickness of 100 μm, and heated at 130°C for 1 minute to form the optically transparent adhesive layer 3. This is used as a test piece and measured in accordance with JIS-K7136, and the value obtained by removing the loss due to the glass from that value. The total light transmittance of the optically transparent adhesive layer 3 is a value measured in accordance with JIS-K7361-1. Specifically, an optically transparent adhesive is applied to the surface of glass with a total light transmittance of 92.7% to a thickness of 100 μm, and heated at 130°C for 1 minute to form the optically transparent adhesive layer 3. This is used as a test piece and measured in accordance with JIS-K7361-1, and the value obtained by removing the loss due to the glass from that value.

[0042] The three-dimensional decorative sheet 10 includes an optically transparent adhesive layer 3 having a refractive index, haze, and total light transmittance within the above ranges. That is, an optically transparent adhesive is adopted such that the optically transparent adhesive layer 3 has a refractive index, haze, and total light transmittance within the above ranges. Thereby, compared with the case of using an adhesive layer made of a normal adhesive that is not an optically transparent adhesive, it becomes clearer and deeper, so that the design quality of the three-dimensional decorative sheet 10 can be further improved.

[0043] The optically transparent adhesive layer 3 preferably has a saturated water absorption rate of 0.3 to 2.5% by weight. The saturated water absorption rate is a value calculated from the difference between the weight W1 of the dried optically transparent adhesive layer 3 and the weight W2 after leaving it in an atmosphere of 75°C and 95% RH for 3 days, as shown in the following formula. {(W2 - W1) / W1}×100(%) The three-dimensional decorative sheet 10 is provided with the optically transparent adhesive layer 3 having a saturation water absorption rate within the above range, so that excess moisture is not drawn in, and by absorbing a trace amount of moisture remaining in the three-dimensional decorative sheet 10, it is possible to suppress the occurrence of bubbles during thermoforming.

[0044] The optically transparent adhesive (OCA) contained in the optically transparent adhesive layer 3 is usually an adhesive used for bonding to adherends such as displays and touch panels. Since it is for optical applications, it is characterized by having excellent adhesive strength, light transmittance, low haze, heat resistance, moisture resistance, UV resistance, anti-clouding property, etc. In the three-dimensional decorative sheet 10, although it is in the printing field, such an optically transparent adhesive is deliberately adopted.

[0045] Specific examples of the optically transparent adhesive include those containing, for example, (meth)acrylic polymers, silicone polymers, acrylic-modified silicone polymers, polyesters, polyurethanes, polyamides, polyethers, fluorine-based polymers, rubber-based polymers, etc. as main components. Among these, from the viewpoints of transparency, adhesiveness, water resistance, and versatility, it is preferable that the optically transparent adhesive contains a (meth)acrylic polymer, a silicone polymer, or an acrylic-modified silicone polymer as an oily component, and from the viewpoint of more excellent transparency, it is more preferable that it contains a (meth)acrylic polymer as a main component.

[0046] The optically transparent adhesive can adopt a solvent type, an emulsion type, a hot melt type, a UV polymerization type, an EB polymerization type, etc. Among these, from the viewpoint of adhesive strength, it is preferable that the optically transparent adhesive adopts a solvent type. In this case, by minimizing the inclusion of water, it is possible to suppress the remaining of these in the optically transparent adhesive layer 3 and the occurrence of bubbles during thermoforming.

[0047] In the three-dimensional decorative sheet 10, the base layer 4 is a layer made of a base substrate. Note that the base substrate may be transparent or opaque. Also, the thickness of the base layer is not particularly limited as long as it is within a range that allows heat forming.

[0048] The base substrate is selected to have a heat distortion temperature of 50 to 130°C. From the perspective of heat resistance, it is preferably selected to have a heat distortion temperature of 70 to 130°C. If the heat distortion temperature is less than 50°C, the heat resistance of the three-dimensional decorative sheet 10 may be insufficient. If the heat distortion temperature exceeds 130°C, there is a drawback that bubbles are likely to occur.

[0049] As the material of the base substrate, the same materials as those exemplified as the material of the above-described transparent substrate can be adopted. Among them, from the perspectives of versatility, strength, and moldability, the material of the base substrate is preferably microcrystalline polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene (ABS), polylactic acid (PLA), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), or biopolycarbonate (PC). Also, from the perspective of environmental friendliness, the material of the base substrate is preferably a biodegradable film such as polylactic acid (PLA) or polyglycolic acid (PGA), or a biomass film such as polyethylene furanoate (PEF) or biopolycarbonate (PC). Based on these, it is more preferable to adopt polylactic acid (PLA) or biopolycarbonate (PC) as the material of the base substrate.

[0050] Note that the material of the transparent substrate and the material of the base substrate may be the same or different. However, the difference between the heat distortion temperature of the transparent substrate and that of the base substrate is preferably 30°C or less. When the difference in heat distortion temperature exceeds 30°C, the timing of softening and hardening between the transparent substrate and the base substrate is shifted compared to the case where the difference in heat distortion temperature is within the above range, resulting in insufficient heating molding efficiency and moldability.

[0051] The three-dimensional decorative sheet 10 is a sheet-like laminate composed of a film layer 1, a design layer 2, an optically transparent adhesive layer 3, and a base layer 4, which is heat-molded into an arbitrary three-dimensional shape at a low temperature of 130°C or less. More specifically, it is a sheet-like laminate that is heat-molded into an arbitrary three-dimensional shape at a low temperature that is equal to or higher than the higher heat distortion temperature of the transparent substrate of the film layer 1 and the base substrate of the base layer 4 and is 130°C or less. Note that the molding step for heat molding will be described later.

[0052] Thus, according to the three-dimensional decorative sheet 10, since it is heat-molded at a low temperature of 130°C or less, the generation of bubbles can be suppressed. In addition, since it is configured to contain as little water, volatile organic solvents, etc. as possible, the generation of bubbles can be further suppressed.

[0053] Next, the manufacturing method of the three-dimensional decorative sheet 10 will be described. FIG. 3 is a flowchart showing the manufacturing method of the three-dimensional decorative sheet according to the first embodiment. As shown in FIG. 3, the manufacturing method of the three-dimensional decorative sheet 10 includes a printing step S1 of producing a printed matter, a laminating step S2 of producing a pre-laminated body, and a molding step S3 of heat-molding the pre-laminated body. By going through these steps, the three-dimensional decorative sheet 10 is obtained.

[0054] The printing step S1 is a step of printing a design on the back surface of a sheet-like transparent substrate by waterless offset printing to obtain a printed matter. That is, it is a step of performing so-called reverse printing on the transparent substrate by waterless offset printing. In the printing step S1, first, a transparent base material of the above-described material is set on a waterless offset printing machine. When UV curable ink is used for reverse printing on the transparent base material, printing is performed, and then the design is cured by irradiating with UV (ultraviolet). Or, when EB curable ink is used for reverse printing on the transparent base material, printing is performed, and then the design is cured by irradiating with EB (Electron Beam). When aqueous or oily ink is used, printing is performed and then dried sufficiently. In this way, a printed matter having the film layer 1 and the design layer 2 is obtained.

[0055] The lamination step S2 is a step of laminating the back surface (design layer 2 side) of the printed matter obtained in the printing step S1 and the base substrate of the above-described material through the above-described optically transparent adhesive to form a pre-laminated body. For such lamination, a so-called laminating machine for flat plates (laminator) is used. In the lamination step S2, the base substrate is set, and an optically transparent adhesive is applied to the upper surface of the base substrate. Then, the printed matter with the design layer 2 side of the film layer 1 and the design layer 2 facing down is laminated thereon. In this way, a sheet-like pre-laminated body laminated in the order of the film layer 1, the design layer 2, the optically transparent adhesive layer 3, and the base layer 4 is obtained from the upper surface side.

[0056] The molding step S3 is a step of putting the pre-laminated body into a molding machine having a predetermined mold and heat-molding it into the shape of the predetermined mold at a low temperature of 130 °C or lower. As such a molding machine, a so-called high-pressure molding machine, a vacuum molding machine, a die press molding machine, etc. are used. In the molding step S3, the pre-laminated body is set in a molding machine having a predetermined mold such that the front side (transparent base material side) is on the upper side and the back side (base substrate side) is on the lower side, and while heating at 130 °C or lower, it is sandwiched between the upper mold and the lower mold to perform molding. Note that, as described above, such a heating temperature is equal to or higher than the higher heat distortion temperature among the heat distortion temperatures of the base materials (transparent base material and base substrate), and is performed at a low temperature of 130°C or lower. In this way, the three-dimensional decorative sheet 10 is obtained.

[0057] Thus, in the method for manufacturing the three-dimensional decorative sheet 10, since the printed matter is once produced and the lower surface of the printed matter and the base substrate are bonded via an optically transparent adhesive, the design layer 2 of the printed matter and the optically transparent adhesive come into contact with each other, and it becomes possible to further suppress the generation of bubbles.

[0058] (Second Embodiment) The three-dimensional decorative sheet according to the second embodiment has the same appearance as the three-dimensional decorative sheet 10 according to the first embodiment shown in FIG. 1. That is, the three-dimensional decorative sheet according to the second embodiment has an Ω shape in a cross-sectional view, similar to the three-dimensional decorative sheet 10 according to the first embodiment, and includes a tunnel portion A1 and base portions A2 extending horizontally from both ends of the tunnel portion A1. And the three-dimensional decorative sheet according to the second embodiment is attached to an article B having a protruding portion B1 disposed on the back surface side thereof.

[0059] FIG. 4 is an enlarged cross-sectional view schematically showing the three-dimensional decorative sheet according to the second embodiment. The cross-sectional view shown in FIG. 4 corresponds to a portion corresponding to the portion P of the three-dimensional decorative sheet according to the first embodiment shown in FIG. 1. Also, the description of the object B is omitted in the same manner. As shown in FIG. 4, the three-dimensional decorative sheet 11 according to the second embodiment is a so-called laminate in which a plurality of layers are laminated. That is, the three-dimensional decorative sheet 11 includes a film layer 1, a design layer 2 provided on the back surface of the film layer 1, a first optically transparent adhesive layer 3a provided on the back surface of the design layer 2, a vapor deposition film layer 5 provided on the back surface of the first optically transparent adhesive layer 3a, a second optically transparent adhesive layer 3b provided on the back surface of the vapor deposition film layer 5, and a base layer 4 provided on the back surface of the second optically transparent adhesive layer 3b. In the three-dimensional decorative sheet 11, the film layer 1 side is the front side, and the base layer 4 side is the back side. That is, the back surface of the base layer 4 comes into contact with the object B.

[0060] Here, the three-dimensional decorative sheet 11 is the same as the three-dimensional decorative sheet 10 according to the first embodiment, except that it includes a first optically transparent adhesive layer 3a, a vapor deposition film layer 5, and a second optically transparent adhesive layer 3b instead of the optically transparent adhesive layer 3. Therefore, since the details of the film layer 1, the design layer 2, and the base layer 4 are common to those described above, the description thereof is omitted.

[0061] In the three-dimensional decorative sheet 11, the first optically transparent adhesive layer 3a is provided on the back surface of the design layer 2 and is a layer containing a first optically transparent adhesive as a main component. Thus, in the three-dimensional decorative sheet 11, since the first optically transparent adhesive layer 3a is provided on the back surface side of the design layer 2, generation of bubbles can be further suppressed at the interface between the two.

[0062] As such a first optically transparent adhesive, the same one as the optically transparent adhesive contained in the above-described optically transparent adhesive layer 3 can be employed. Among them, as the first optically transparent adhesive, from the viewpoints of transparency, adhesiveness, and water resistance, it is preferably one containing a (meth)acrylic polymer, a silicone polymer, or an acrylic-modified silicone polymer as an oily component, and more preferably one containing a (meth)acrylic polymer as a main component.

[0063] In the three-dimensional decorative sheet 11, the vapor deposition film layer 5 is provided on the back surface of the first optically transparent adhesive layer 3a and is a layer composed of a vapor deposition film in which a metal 5a is vapor-deposited on an intermediate base material 5b. Note that the intermediate base material 5b may be transparent or opaque. In the three-dimensional decorative sheet 11, by providing the vapor deposition film layer 5, the range of expression of the design, such as making it metallic or mirror-like, can be expanded. As a result, it becomes possible to impart a more luxurious feeling.

[0064] The vapor deposition film layer 5 has a thickness of 50 to 100 μm. If the thickness of the vapor deposition film layer 5 is less than 50 μm, it has the drawback that it is more likely to fold and wrinkle compared to the case where the thickness is within the above range. If the thickness exceeds 100 μm, the effect of vapor deposition is not improved compared to the case where the thickness is within the above range, and only the weight increases.

[0065] As the intermediate base material 5b, one with a heat distortion temperature of 50 to 130°C is adopted. Also, from the viewpoint of heat resistance, it is preferable to adopt one with a heat distortion temperature of 70 to 130°C. If the heat distortion temperature is less than 50°C, the heat resistance as the three-dimensional decorative sheet 10 may be insufficient. If the heat distortion temperature exceeds 130°C, there is a drawback that bubbles are likely to occur.

[0066] As the material of the intermediate base material 5b, the same materials as those exemplified as the materials of the above-mentioned transparent base material can be adopted. Among these, from the viewpoints of versatility, strength, transparency, and molding process suitability, it is preferable to adopt microcrystalline polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene (ABS), polylactic acid (PLA), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), or biopolycarbonate (PC) as the material of the intermediate base material 5b. Also, from the viewpoint of environmental friendliness, it is preferable to adopt biodegradable films such as polylactic acid (PLA) and polyglycolic acid (PGA), and biomass films such as polyethylene furanoate (PEF) and biopolycarbonate (PC) as the material of the intermediate base material 5b. Based on these, it is more preferable to adopt polylactic acid (PLA) or biopolycarbonate (PC) as the material of the intermediate base material 5b.

[0067] Note that the materials of the transparent base material, the intermediate base material, and the base base material may be the same or different. However, the difference between the maximum value and the minimum value among the heat distortion temperature of the transparent substrate, the heat distortion temperature of the intermediate 5b, and the heat distortion temperature of the base substrate is preferably 30°C or less. When the difference in heat distortion temperature exceeds 30°C, the softening and curing timings of the transparent substrate, the intermediate substrate, and the base substrate are shifted compared to the case where the difference in heat distortion temperature is within the above range, resulting in disadvantages such as insufficient heating molding efficiency and moldability.

[0068] As the metal 5a (including oxides) vapor-deposited on the intermediate substrate 5b, aluminum, tin, indium, chromium, nickel, titanium, their alloys, or their oxides, etc. can be adopted. Among these, as the vapor-deposited metal 5a, from the viewpoints of versatility and molding stretchability, it is preferable to adopt aluminum, tin, or indium, and from the viewpoint of texture, it is more preferable to adopt indium. The vapor deposition method is not particularly limited, and known methods such as vacuum vapor deposition can be used.

[0069] In the vapor-deposited film, the metal 5a is vapor-deposited on the front side of the intermediate substrate 5b. As a result, during heat molding, the first optically transparent adhesive having fluidity is pressed against the metal side of the vapor-deposited film, so that the first optically transparent adhesive penetrates between the metal particles on the surface of the vapor-deposited film, and the two become more closely adhered at the interface.

[0070] In the three-dimensional decorative sheet 11, the second optically transparent adhesive layer 3b is provided on the back surface of the vapor-deposited film layer 5 and is a layer containing the second optically transparent adhesive as the main component. Thus, in the three-dimensional decorative sheet 11, since the second optically transparent adhesive layer 3b is provided on the back surface side of the vapor-deposited film layer 5, the generation of bubbles can be further suppressed at the interface between the two.

[0071] As such a second optically transparent adhesive, the same one as the optically transparent adhesive contained in the optically transparent adhesive layer 3 described above can be adopted. Among them, as the second optically transparent pressure-sensitive adhesive, from the viewpoints of transparency, adhesiveness, and water resistance, it is preferably one containing a (meth)acrylic polymer, a silicone polymer, or an acrylic-modified silicone polymer as an oily component, and more preferably one containing a (meth)acrylic polymer as a main component. Note that the first optically transparent pressure-sensitive adhesive and the second optically transparent pressure-sensitive adhesive may be the same or different.

[0072] The three-dimensional decorative sheet 11 is a sheet-like laminate composed of a film layer 1, a design layer 2, a first optically transparent pressure-sensitive adhesive layer 3a, a vapor-deposited film layer 5, a second optically transparent pressure-sensitive adhesive layer 3b, and a base layer 4, which is heat-molded into an arbitrary three-dimensional shape at a low temperature of 130 °C or lower. More specifically, among the heat distortion temperatures of the transparent base material of the film layer 1, the intermediate base material 5b of the vapor-deposited film layer 5, and the base material of the base layer 4, it is at a temperature equal to or higher than the heat distortion temperature of the highest base material, and at a low temperature of 130 °C or lower, the sheet-like laminate is heat-molded into an arbitrary three-dimensional shape. Note that the molding step of heat molding will be described later.

[0073] Thus, according to the three-dimensional decorative sheet 10, since it is heat-molded at a low temperature of 130 °C or lower, the generation of bubbles can be suppressed. In addition, since it is configured to contain as little water, volatile organic solvents, etc. as possible, the generation of bubbles can be further suppressed.

[0074] Next, the manufacturing method of the three-dimensional decorative sheet 11 will be described. FIG. 5 is a flowchart showing the manufacturing method of the three-dimensional decorative sheet according to the second embodiment. As shown in FIG. 5, the manufacturing method of the three-dimensional decorative sheet 11 includes a printing step S1 of producing a printed matter, an adhesive body production step S4 of producing an optical film adhesive body, a lamination step S2a of producing a pre-laminated body, and a molding step S3 of heat-molding the pre-laminated body. By passing through these steps, the three-dimensional decorative sheet 11 is obtained.

[0075] The manufacturing method of the three-dimensional decorative sheet according to the second embodiment further includes an adhesive body manufacturing step S4, and is different from the manufacturing method of the three-dimensional decorative sheet according to the first embodiment in that, in the lamination step S2a, an optical film adhesive is used instead of the optically transparent adhesive. Since the details of the printing step S1 and the molding step S3 are the same as those described above, the description thereof will be omitted.

[0076] The adhesive body manufacturing step S4 is a step of applying a first optically transparent adhesive to the surface (metal side) of the vapor deposition film and a second optically transparent adhesive to the back surface (opposite side to the metal) of the vapor deposition film to form an optical film adhesive. As described above, the first optically transparent adhesive and the second optically transparent adhesive may have the same or different components. In the adhesive body manufacturing step S4, the vapor deposition film is obtained by vapor-depositing the above-described metal on the intermediate base material of the above-described material by a known method. Also, the method of applying the first optically transparent adhesive and the second optically transparent adhesive to the vapor deposition film is not particularly limited, and for example, surface treatment by a doctor coater, a bar coater, a roll coater, etc., spraying by a spray, a shower, etc., dipping (in this case, the first optically transparent adhesive and the second optically transparent adhesive have the same component), etc. can be adopted. After applying the optically transparent adhesive to one surface of the vapor deposition film, it is preferably protected with a release sheet or the like and then the optically transparent adhesive is applied to the other surface. In this way, an optical film adhesive is obtained.

[0077] The lamination step S2a is a step of laminating the back surface (design layer side) of the printed matter obtained in the printing step S1 and the base substrate of the above-described material via the optical film adhesive obtained in the adhesive body manufacturing step S4 to form a pre-laminated body. For such lamination, a so-called laminating machine for flat plates is used. In the lamination step S2, the base substrate is set, and the optical film adhesive is placed on the upper surface of the base substrate. Note that the optical film adhesive is arranged such that the surface of the vapor deposition film with metal vapor deposition is on the upper side, that is, the first optically transparent adhesive is on the upper side and the second optically transparent adhesive is on the lower side. Then, a printed matter with the design layer 2 side of the film layer 1 and the design layer 2 facing down is bonded thereto. In this way, a sheet-like pre-laminated body is obtained, which is laminated in the order of the film layer 1, the design layer 2, the first optically transparent adhesive layer 3a, the vapor deposition film layer 5, the second optically transparent adhesive layer 3b, and the base layer 4 from the upper surface side.

[0078] Note that in the molding step S3, the heating temperature is, as described above, equal to or higher than the highest heat distortion temperature among the heat distortion temperatures of the base materials (transparent base material, intermediate base material, and base substrate), and is performed at a low temperature of 130°C or lower. In this way, the three-dimensional decorative sheet 11 is obtained.

[0079] As described above, in the method for manufacturing the three-dimensional decorative sheet 11, the printed matter and the optical film adhesive are once produced, and the back surface of the printed matter and the base substrate are bonded via the optically transparent adhesive. Therefore, the design layer 2 of the printed matter and the optically transparent adhesive are brought into contact, and the vapor-deposited metal and the optically transparent adhesive are brought into contact, so that the generation of bubbles can be suppressed. Also, in the molding step S3, since the first optically transparent adhesive is pressed against the metal side of the vapor deposition film, the first optically transparent adhesive penetrates between the metal particles on the surface of the vapor deposition film, and the two become more closely adhered at the interface. As a result, the generation of bubbles can be suppressed and the quality can also be improved.

[0080] As described above, the preferred embodiments of the present invention have been described, but the present invention is not limited to the above embodiments.

[0081] The three-dimensional decorative sheet 10 according to the first embodiment and the three-dimensional decorative sheet 11 according to the second embodiment both have a shape consisting of a tunnel portion A1 and base portions A2 extending horizontally from both ends of the tunnel portion A1 (see Fig. 1). However, if it has a three-dimensional shape, it is not limited to this shape. Also, a design picture T is drawn on the front surface side of the tunnel portion A1. However, the design picture T is not limited to that shown in Fig. 1. Also, all portions other than the design picture T on the front surface sides of the tunnel portion A1 and the base portions A2 are solid colors, but this is not essential either. That is, the three-dimensional decorative sheet 10 has a design layer 2, but it is not necessarily required to provide the design layer 2 on the entire lower surface of the film layer 1.

[0082] The three-dimensional decorative sheet 10 according to the first embodiment and the three-dimensional decorative sheet 11 according to the second embodiment are used by being attached to an article B, but this is not essential either. That is, it may be used as a decorative sheet having a three-dimensional shape by itself.

[0083] In the three-dimensional decorative sheet 11 according to the second embodiment, the vapor deposition film has metal vapor-deposited on the front side of the intermediate base material, but it is also possible to have metal vapor-deposited on the back side.

Examples

[0084] Hereinafter, the present invention will be described more specifically based on examples and comparative examples, but the present invention is not limited to the following examples.

[0085] (Examples 1, 2) First, a bio-polycarbonate film with a thickness of 200 μm was used as the transparent base material constituting the film layer 1. Then, a design layer 2 was formed on the back surface of the transparent base material using a waterless offset printing machine to obtain a printed matter (printing step). Note that UV-curable ink is employed as the ink. Then, an acrylic-based optically transparent adhesive was applied to the back surface of the printed matter with a bar coater at 25.5 g / m 2Applied, and on this, a polyester film with a thickness of 38 μm was laminated as a base substrate, and lamination was performed using a laminating machine to obtain a pre-laminated body (lamination step). Then, this pre-laminated body was heat-formed at 130 °C for 1 minute using a vacuum forming machine to obtain a three-dimensional sample (forming step). The physical properties of the formed optically transparent adhesive layer are shown in Table 1.

[0086] (Example 3) First, a bio-polycarbonate film with a thickness of 200 μm was used as the transparent substrate constituting the film layer 1. And on the back surface of the transparent substrate, a design layer 2 was formed using a waterless offset printing machine to obtain a printed matter (printing step). Note that UV-curable ink was adopted as the ink. Next, as the vapor deposition film, a polymethyl methacrylate film with a thickness of 75 μm having indium vapor-deposited on the front surface was used. And on both surfaces of the vapor deposition film, an acrylic-based optically transparent adhesive (solvent type) was applied at 25.5 g / m 2 each using a bar coater to obtain an optical film adhesive body (adhesive body production step).

[0087] Next, a polyester film with a thickness of 38 μm was used as the base substrate. And the back surface of the printed matter and the base substrate were laminated via the optical film adhesive body, and lamination was performed using a laminating machine to obtain a pre-laminated body (lamination step). Finally, this pre-laminated body was heat-formed at 130 °C for 1 minute using a vacuum forming machine to obtain a three-dimensional sample (forming step). The physical properties of the formed first optically transparent adhesive layer are shown in Table 1. Note that the physical properties of the second optically transparent adhesive layer were the same as those of the first optically transparent adhesive layer. Also, a photograph of the obtained sample is shown in Fig. 6.

[0088] (Comparative Example 1) A sample was obtained in the same manner as in Example 1, except that a general adhesive was used instead of the optically transparent adhesive. Note that for the general adhesive, the refractive index, haze value, total light transmittance, and saturated water absorption rate shown in Table 1 were not measured.

[0089] (Comparative Example 2) A sample was obtained in the same manner as in Example 1, except that the thermoforming temperature was set to 250°C.

[0090] (Comparative Example 3) A sample was obtained in the same manner as in Example 3, except that the thermoforming temperature was set to 250°C. Also, a photograph of the obtained sample is shown in Fig. 7.

[0091] (Table 1) TIFF2025092082000002.tif68158

[0092] (Evaluation 1) The quality of the obtained sample was visually evaluated based on the following criteria. 〇 ··· Precise and three-dimensional expression, and the edge part is also sharp. × ··· It can be expressed sufficiently, but the three-dimensional feeling is insufficient. (Evaluation 2) The occurrence of bubbles was visually evaluated based on the following criteria. 〇 ··· Almost no bubbles are generated. △ ··· A few bubbles are generated. × ··· A large number of bubbles are generated. The obtained results are shown in Table 2.

[0093] (Table 2) TIFF2025092082000003.tif72156

[0094] From the results shown in Table 2, the samples of Examples 1 to 3 of the present invention had almost no generation of bubbles and were excellent in the quality of the design (see Fig. 6). On the other hand, in the samples of Comparative Examples 1 to 3 not according to the present invention, a large amount of bubbles were generated (see Fig. 7). From this, it was confirmed that according to the three-dimensional decorative sheet of the present invention, generation of bubbles can be suppressed as much as possible, and the quality of the design is also excellent.

Industrial Applicability

[0095] The three-dimensional decorative sheet of the present invention is used as a decorative sheet for attaching a design to an article having a three-dimensional shape. That is, the decorative sheet is heat-molded along the outer shape of the portion where the article is to be designed to form a three-dimensional three-dimensional decorative sheet, and this is attached to the article to attach a design to the article. According to the three-dimensional decorative sheet of the present invention, generation of bubbles can be suppressed as much as possible, and the quality of the design is also excellent.

Explanation of Signs

[0096] 1 ··· Film layer 2 ··· Design layer 3 ··· Optically transparent adhesive layer 3a ··· First optically transparent adhesive layer (optically transparent adhesive layer) 3b ··· Second optically transparent adhesive layer (optically transparent adhesive layer) 4 ··· Base layer 5 ··· Vapor-deposited film layer 5a ··· Metal 5b ··· Intermediate substrate 10, 11 ··· Three-dimensional decorative sheet A1 ··· Main body part A2 ··· Base part B ··· Article B1 ··· Protrusion S1 ··· Printing step S2, S2a ··· Laminating step S3 ··· Molding step S4 ··· Adhesive body manufacturing step T ··· Design drawing

Claims

1. In a three-dimensional decorative sheet having a three-dimensional shape, a film layer made of a transparent base material having a heat distortion temperature of 50 to 130 °C, a design layer made of a design printed on the back surface of the film layer, an optically transparent adhesive layer including an optically transparent adhesive provided on the design layer, a base layer made of a base material having a heat distortion temperature of 50 to 130 °C provided on the optically transparent adhesive layer, comprising, the refractive index of the optically transparent adhesive layer is 1.4 to 1.5, the haze value of the optically transparent adhesive layer is 1.0% or less, the total light transmittance of the optically transparent adhesive layer is 85 to 100%, A three-dimensional decorative sheet that is heat-formed at a low temperature of 130 °C or lower.

2. The material of the transparent base material is microcrystalline polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene, biopolycarbonate, polylactic acid, polyethylene terephthalate, or polymethyl methacrylate, the optically transparent adhesive contains a (meth)acrylic polymer, a silicone polymer, or an acrylic-modified silicone polymer, the material of the base substrate is microcrystalline polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene, biopolycarbonate, polylactic acid, polyethylene terephthalate, or polymethyl methacrylate, The three-dimensional decorative sheet according to claim 1, wherein the saturated water absorption rate of the optically transparent adhesive layer is 0.3 to 2.5% by weight.

3. In a three-dimensional decorative sheet having a three-dimensional shape, a film layer made of a transparent base material having a heat distortion temperature of 50 to 130 °C, a design layer made of a design printed on the back surface of the film layer, a first optically transparent adhesive layer including a first optically transparent adhesive provided on the design layer, A vapor deposition film layer which is provided on the first optically transparent adhesive layer and consists of a vapor deposition film in which a metal is vapor-deposited on an intermediate substrate having a heat distortion temperature of 50 to 130 °C, A second optically transparent adhesive layer including a second optically transparent adhesive provided on the vapor deposition film layer, A base layer which is provided on the second optically transparent adhesive layer and consists of a base substrate having a heat distortion temperature of 50 to 130 °C, Comprising, The refractive indices of the first optically transparent adhesive layer and the second optically transparent adhesive layer are both 1.4 to 1.5, The haze values of the first optically transparent adhesive layer and the second optically transparent adhesive layer are 1.0% or less, The total light transmittance of the first optically transparent adhesive layer and the second optically transparent adhesive layer is 85 to 100%, A three-dimensional decorative sheet which is heat-molded at a low temperature of 130 °C or lower.

4. The three-dimensional decorative sheet according to claim 3, wherein the vapor deposition film has the metal vapor-deposited on the front side of the intermediate substrate.

5. The material of the transparent substrate is microcrystalline polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene, biopolycarbonate, polylactic acid, polyethylene terephthalate or polymethyl methacrylate, The first optically transparent adhesive contains a (meth)acrylic polymer, a silicone polymer or an acrylic-modified silicone polymer, The material of the intermediate substrate is microcrystalline polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene, biopolycarbonate, polylactic acid, polyethylene terephthalate or polymethyl methacrylate, The metal is aluminum, tin or indium, The second optically transparent adhesive contains a (meth)acrylic polymer, a silicone polymer or an acrylic-modified silicone polymer, The material of the base substrate is microcrystalline polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene, biopolycarbonate, polylactic acid, polyethylene terephthalate, or polymethyl methacrylate, The three-dimensional decorative sheet according to claim 3, wherein the saturation water absorption rate of the first optically transparent adhesive layer and the second optically transparent adhesive layer is 0.3 to 2.5% by weight.

6. The three-dimensional decorative sheet according to any one of claims 1 to 5, wherein the design layer is composed of a design printed on the back surface of the film layer by waterless offset printing.

7. A method for manufacturing the three-dimensional decorative sheet according to claim 1 or 2, A printing step of printing a design on the back surface of the sheet-shaped transparent substrate by waterless offset printing to obtain a printed matter, A laminating step of laminating the back surface of the printed matter and the base substrate via the optically transparent adhesive to obtain a pre-laminated body, A molding step of putting the pre-laminated body into a molding machine and heat-molding it into a desired shape at a low temperature of 130 °C or lower, A method for manufacturing a three-dimensional decorative sheet comprising the above steps.

8. A method for manufacturing the three-dimensional decorative sheet according to any one of claims 3 to 5, A printing step of printing a design on the back surface of the sheet-shaped transparent substrate by waterless offset printing to obtain a printed matter, An adhesive body preparation step of applying a first optically transparent adhesive to the surface of the vapor deposition film and applying a second optically transparent adhesive to the back surface of the vapor deposition film to obtain an optical film adhesive body, A laminating step of laminating the back surface of the printed matter and the base substrate via the optical film adhesive body to obtain a pre-laminated body, A molding step of putting the pre-laminated body into a molding machine and heat-molding it into a desired shape at a low temperature of 130 °C or lower, A method for manufacturing a three-dimensional decorative sheet comprising the above steps.

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