Decorative sheet and decorative material

Abstract

To provide a decorative sheet and a decorative material that enable enhancement of handling characteristics and design characteristics.SOLUTION: A decorative sheet 20 comprises a base material layer 21, a design layer 22 laminated on the base material layer 21, and a glass plate 24 covering the design layer 22. A thickness t of the glass plate 24 is 30 μm or more and 200 μm or less. Among surfaces 24a and 24b of the glass plate 24, a surface roughness Ra of the surface 24a facing away from the design layer 22 is 0.2 nm or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to decorative sheets and decorative materials. [Background technology]

[0002] Conventionally, when it is desired to decorate components used in building materials, furniture, home appliances, etc., decorative sheets have been attached to the components. Due to the recent trend of consumers toward luxury goods, mirror finishes (surface smoothness) are often required for such decorative sheets. Meanwhile, many decorative sheets have a surface protective layer that has properties such as scratch resistance or stain resistance (see, for example, Patent Documents 1 and 2).

[0003] Patent Document 1 discloses a decorative sheet characterized by forming a resin layer between a metal plate and a glass layer (surface protective layer) to integrate them together. Patent Document 2 discloses a decorative sheet having specular properties, in which an ionizing radiation curable resin composition is used as the surface protective layer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 6-322934 [Patent Document 2] Patent No. 6834307 Summary of the Invention [Problem to be solved by the invention]

[0005] When glass plates are used for the surface protection layer, ordinary glass plates lack flexibility, which may limit the locations where they can be installed. Furthermore, because glass plates are heavy, the workload during installation is heavy and they place a strain on the structure of the building. Furthermore, if the glass plate is too thick, the clarity of the image may be impaired.

[0006] Furthermore, when a resin is used for the surface protective layer, transparency, scratch resistance, flame retardancy, etc. may be reduced compared to when a glass plate is used for the surface protective layer.

[0007] The present disclosure has been made in consideration of these points, and aims to provide a decorative sheet and decorative material that can improve handling and design properties. [Means for solving the problem]

[0008] The embodiments of the present disclosure relate to the following [1] to [5].

[0009] [1] a substrate layer; A pattern layer laminated on the base layer; a glass plate covering the pattern layer; The thickness of the glass plate is 30 μm or more and 200 μm or less, The decorative sheet has a surface roughness Ra of 0.2 nm or less on the surface of the glass plate facing away from the picture layer.

[0010] [2] The decorative sheet according to [1], wherein the surface of the glass plate facing the pattern layer has a surface roughness Ra of 0.2 nm or less.

[0011] [3] Further provided is an adhesive layer that bonds the pattern layer and the glass plate together, The decorative sheet according to [1] or [2], wherein the adhesive layer has a visible light transmittance of 40% or more.

[0012] [4] The decorative sheet according to [3], wherein the total thickness of the substrate layer, the pattern layer, the adhesive layer, and the glass plate is 4 μm or more and 100 μm or less.

[0013] [5] [1] to [4], and a decorative sheet according to any one of [1] to [4]. A decorative material comprising a support joined to the decorative sheet. [Effects of the Invention]

[0014] According to the present disclosure, the handleability and design properties of decorative sheets can be improved. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a cross-sectional view showing a decorative material and a decorative sheet according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In the drawings accompanying this specification, the scale and aspect ratios have been appropriately changed and exaggerated from those of the actual objects for the sake of ease of illustration and understanding.

[0017] Terms used in this specification that specify shapes and geometric conditions, as well as their degrees, such as terms like "parallel," "perpendicular," and "same," and values ​​of lengths and angles, are not to be construed as being bound by strict meanings, but rather as including a range within which similar functions can be expected.

[0018] In this specification, terms such as "film," "sheet," and "plate" are not terms that are distinguished from one another solely on the basis of differences in name. For example, a "film" cannot be distinguished from a member called a sheet or plate solely on the basis of differences in name.

[0019] <Decorative materials> As shown in Fig. 1, the decorative material 10 comprises a decorative sheet 20 and a support 15 joined to the decorative sheet 20. Of these, the decorative sheet 20 is a member for displaying a design. Details of the decorative sheet 20 will be described later. Here, the support 15 will first be described.

[0020] <<Support>> The support 15 is a member for supporting the decorative sheet 20. The support 15 is a member to which a design is imparted by the decorative sheet 20. The support 15 may be made of, for example, a metal member, a wooden member, a ceramic member, a resin member, or the like. Among these, the metal member is a member used as a plate or steel plate made of iron, aluminum, or the like, a three-dimensional article, or a sheet. The wooden member is a member used as a plate or three-dimensional article, such as a wood veneer made of various types of wood, such as cedar, cypress, pine, or lauan, a wood plywood, particle board, MDF (medium-density fiberboard), or a wood fiberboard such as laminated lumber. The ceramic member is a member used as a plate or three-dimensional article, such as glass, ceramics, non-cement ceramic materials, such as gypsum, or non-ceramic ceramic materials, such as ALC (aerated lightweight concrete) board. Resin components, etc., are components used as plates, three-dimensional objects, or sheets, etc., made of acrylic resin, polyester resin, polystyrene, polyolefin resin such as polypropylene, ABS (acrylonitrile-butadiene-styrene copolymer) resin, phenolic resin, vinyl chloride resin, cellulose resin, rubber, etc.

[0021] The support 15 may be bonded to the decorative sheet 20 via an adhesive layer (not shown). The adhesive layer may contain an adhesive and a resin. The adhesive used in the adhesive layer is not particularly limited. The adhesive used in the adhesive layer may be a known adhesive. The adhesive used in the adhesive layer may be a heat-sensitive adhesive, a pressure-sensitive adhesive, or the like. The resin used in the adhesive may be an acrylic resin, a urethane resin, a vinyl chloride resin, a vinyl acetate resin, a vinyl chloride-vinyl acetate copolymer resin, a styrene-acrylic copolymer resin, a polyester resin, a polyamide resin, or the like. The resin used in the adhesive may contain one of these alone or a combination of these. The resin used in the adhesive may be a two-component curing polyurethane adhesive or a polyester adhesive using an isocyanate compound or the like as a curing agent. A pressure-sensitive adhesive may be used in the adhesive layer. The pressure-sensitive adhesive may be appropriately selected from acrylic, urethane, silicone, rubber, or other pressure-sensitive adhesives.

[0022] The adhesive layer can be produced by applying and drying the resin in a coatable form such as a solution or emulsion by gravure printing, screen printing, or reverse coating using a gravure plate. The thickness of the adhesive layer is not particularly limited. From the viewpoint of obtaining excellent adhesiveness, the thickness of the adhesive layer may be 1 μm or more and 100 μm or less, 5 μm or more and 50 μm or less, or 10 μm or more and 30 μm or less.

[0023] Next, the decorative sheet 20 will be described in detail.

[0024] <<Decorative sheet>> 1, the decorative sheet 20 includes a base layer 21, a pattern layer 22 laminated on the base layer 21, and a glass plate 24 covering the pattern layer 22. The decorative sheet 20 may further include an adhesive layer 23 that bonds the pattern layer 22 and the glass plate 24 together.

[0025] <<<Base material layer>>> The substrate layer 21 is a layer for supporting the pattern layer 22 and the glass plate 24. The substrate layer 21 may be composed of a flat plate-like member such as a film. The shape and dimensions of the substrate layer 21 are not particularly limited. The shape and dimensions of the substrate layer 21 can be appropriately selected depending on the application, desired performance, and processability. The thickness of the substrate layer 21 may generally be 10 μm or more and 100 μm or less from the viewpoints of manufacturing processability, mechanical strength, ease of use and handling, and economy.

[0026] The material of the base layer 21 is, for example, a resin, a metal, a non-metallic inorganic material, a fibrous material, or a wood-based material. The material of the base layer 21 can be appropriately selected depending on the application.

[0027] The base material layer 21 may be a single layer. The base material layer 21 may be formed by stacking multiple layers made of the above materials. When the base material layer 21 is a laminate in which multiple layers are stacked, the multiple layers may be made of different materials, so that the performances of the materials of each layer complement each other.

[0028] The resin used for the base layer 21 is, for example, various synthetic resins or natural resins. The synthetic resin may be, for example, a thermoplastic resin or a cured product of a curable resin composition.

[0029] Examples of the thermoplastic resin include olefin resins such as polyethylene, polypropylene, polymethylpentene, ionomers, and various olefin-based thermoplastic elastomers; vinyl chloride resins such as polyvinyl chloride, polyvinylidene chloride, and vinyl chloride-vinyl acetate copolymers; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, ethylene glycol-terephthalic acid-isophthalic acid copolymers, and polyester-based thermoplastic elastomers; acrylic resins such as polymethyl (meth)acrylate, polyethyl (meth)acrylate, polybutyl (meth)acrylate, and methyl (meth)acrylate-butyl (meth)acrylate copolymers; polyamide resins such as nylon 6 or nylon 66; cellulose resins such as cellulose triacetate, cellophane, and celluloid; styrene resins such as polystyrene, acrylonitrile-styrene copolymers, and acrylonitrile-butadiene-styrene copolymers (ABS); polyvinyl alcohol, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, polycarbonate resins, polyarylate resins, and polyimide resins. The curable resin composition may be, for example, a thermosetting resin composition or an ionizing radiation curable resin composition. The natural resin may be, for example, natural rubber, rosin, amber, etc.

[0030] The thermosetting resin composition may be a composition containing at least a thermosetting resin, and is cured by heating. The thermosetting resin may be, for example, an acrylic resin, a urethane resin, a phenolic resin, a urea-melamine resin, an epoxy resin, an unsaturated polyester resin, a silicone resin, etc. In addition to these thermosetting resins, the thermosetting resin composition may contain, as necessary, a curing agent, a curing catalyst, etc.

[0031] The thermosetting resin composition may be, for example, a two-component curing composition in which the main component is a polyol-based resin and the curing agent is an isocyanate-based compound. The polyol-based resin may be, for example, an acrylic polyol, a polyester polyol, or the like.

[0032] The ionizing radiation curable resin composition may be, for example, an electron beam curable resin composition or an ultraviolet ray curable resin composition.

[0033] The metal used for the base layer 21 may be, for example, aluminum or an aluminum-containing alloy such as duralumin, iron or an iron-containing alloy such as carbon steel or stainless steel, copper or an alloy containing copper such as brass or bronze, gold, silver, chromium, nickel, cobalt, tin, titanium, etc. The base layer 21 may include a plating layer plated with any of these metals.

[0034] The non-metallic inorganic material used for the base layer 21 may be, for example, non-ceramic ceramic materials such as cement, ALC (lightweight aerated concrete), gypsum, calcium silicate, and wood chip cement; ceramic ceramic materials such as porcelain, earthenware, glass, and enamel; and natural stones such as limestone, marble, granite, and andesite.

[0035] The fibrous material used for the substrate layer 21 may be, for example, tissue paper, kraft paper, fine paper, Japanese paper, titanium paper, linter paper, parchment paper, paraffin paper, parchment paper, glassine paper, wallpaper backing paper, paperboard, and plasterboard base paper. The paper may further contain a resin, such as acrylic resin, styrene-butadiene rubber, melamine resin, or urethane resin, to increase the interfiber strength of the paper substrate or prevent fuzzing. Resin-added paper may be, for example, interfiber-reinforced paper or resin-impregnated paper. A substrate having a fibrous material layer and a resin layer laminated thereon may be, for example, wallpaper rolls in which a vinyl chloride resin layer, an olefin resin layer, an acrylic resin layer, or another resin layer is laminated on the surface of wallpaper backing paper. The fibrous material used for the substrate layer 21 may also be, for example, a woven or nonwoven fabric made of silk, cotton, linen, polyester resin fiber, acrylic resin fiber, glass fiber, carbon fiber, or other fibers.

[0036] The material of the base layer 21 preferably includes paper among fibrous materials, because the pattern layer 22 can be easily provided on the base layer 21 and because of environmental considerations.

[0037] The base layer 21 may contain additives as needed. When the material of the base layer 21 is a resin, the additives may be, for example, inorganic fillers such as calcium carbonate and clay, flame retardants such as magnesium hydroxide, antioxidants, lubricants, foaming agents, ultraviolet absorbers, light stabilizers, etc. The content of the additives is not particularly limited as long as it does not impair processing characteristics, etc., and can be set appropriately depending on the required characteristics, etc.

[0038] To improve adhesion to other layers constituting the decorative material 10, the substrate layer 21 may be subjected to a surface treatment such as physical surface treatment, such as oxidation or roughening, or chemical surface treatment on one or both sides. Examples of oxidation methods include corona discharge treatment, chromium oxidation treatment, flame treatment, hot air treatment, and ozone-ultraviolet treatment. Examples of roughening methods include sandblasting and solvent treatment. These surface treatments are appropriately selected depending on the type of substrate layer 21. Corona discharge treatment is excellent in terms of the effect of the surface treatment and operability.

[0039] <<<Picture layer>>> The pattern layer 22 is a layer for forming the design displayed by the decorative sheet 20. The pattern layer 22 may form a wood grain pattern, such as annual rings or vessel grooves on the surface of a wooden board. The pattern layer 22 may form a stone grain pattern on the surface of a stone slab, such as marble or granite. The pattern layer 22 may form a fabric grain pattern on the surface of a fabric or a leather grain pattern on the surface of leather. The pattern layer 22 may form a tiled pattern including grooves, a brickwork pattern including grooves, a sand-grained pattern, a matte pattern, or a pattern consisting of an array of multiple parallel concave and convex portions (so-called "line-like concave and convex pattern" or "ray-carved pattern"). The pattern layer 22 may form a geometric pattern or an abstract pattern, such as letters, figures, polka dots, or floral patterns.

[0040] The design layer 22 may be formed from an ink obtained by appropriately mixing a binder resin with a colorant such as a pigment or dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, a curing agent, an ultraviolet absorber, a light stabilizer, and the like. The binder resin used in the design layer 22 is not particularly limited. Examples of the binder resin include urethane resin, acrylic polyol resin, acrylic resin, ester resin, amide resin, butyral resin, styrene resin, urethane-acrylic copolymer, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate-acrylic copolymer resin, chlorinated propylene resin, nitrocellulose resin, and cellulose acetate resin. The binder resin may be various types of resin, such as a one-component curing resin or a two-component curing resin containing a curing agent such as an isocyanate compound.

[0041] The colorant is not particularly limited. The colorant may be, for example, an inorganic pigment such as carbon black (ink), iron black, titanium white, antimony white, yellow lead, titanium yellow, red iron oxide, cadmium red, ultramarine blue, or cobalt blue. The colorant may be, for example, an organic pigment or dye such as quinacridone red, isoindolinone yellow, nickel azo complex, phthalocyanine blue, or azomethine azo black. The colorant may be, for example, a metal pigment made of scaly foil flakes such as aluminum or brass. The colorant may be, for example, a pearlescent pigment made of scaly foil flakes such as titanium dioxide-coated mica or basic lead carbonate.

[0042] The content of the colorant is not particularly limited and may be adjusted depending on the color tone and density of the design displayed by the design layer 22, the material of the colorant, etc. The content of the colorant may be, for example, 20 parts by mass or more and 500 parts by mass or less, 50 parts by mass or more and 300 parts by mass or less, or 70 parts by mass or more and 200 parts by mass or less, relative to 100 parts by mass of the binder resin.

[0043] The design layer 22 may contain additives such as ultraviolet absorbers, light stabilizers, and colorants. The thickness of the design layer 22 may be selected appropriately depending on the desired design. The thickness of the design layer 22 may be selected from the viewpoint of concealing the background color of the support 15 and forming an appropriate design. The thickness of the design layer 22 may be, for example, 0.5 μm to 20 μm, 1 μm to 10 μm, or 2 μm to 5 μm.

[0044] The design layer 22 may be a thin film of a single metal element such as gold, silver, copper, tin, iron, nickel, chromium, or cobalt, or may be a thin film of an alloy containing two or more of the above metal elements. The alloy may be, for example, brass, bronze, or stainless steel. The thickness of the metal thin film may be, for example, 0.1 μm or more and 1 μm or less.

[0045] <<<adhesive layer>>> The adhesive layer 23 is a layer for bonding the glass plate 24 to the pattern layer 22. The adhesive layer 23 is preferably transparent. In this case, the adhesive layer 23 may be a so-called OCA (Optical Clear Adhesive) layer. The OCA layer is a layer produced, for example, as follows: First, a liquid curable adhesive layer composition containing a polymerizable compound is applied to a release film such as polyethylene terephthalate (PET). Next, this is cured using, for example, ultraviolet (UV) light to obtain an optically clear adhesive film called an OCA sheet. After this OCA sheet is attached to an object, the release film is peeled off and removed to obtain the OCA layer. The material of the OCA layer may be an acrylic resin, a silicone resin, a urethane resin, or the like.

[0046] The visible light transmittance of the adhesive layer 23 may be 40% or more, and preferably 30% or more. There is no particular upper limit to the visible light transmittance of the adhesive layer 23, but it may be, for example, 100% or less. By setting the visible light transmittance of the adhesive layer 23 within the above range, the transparency of the adhesive layer 23 can be increased, making the design layer 22 easier to see. Visible light refers to light with a wavelength of 400 nm or more and 700 nm or less. A visible light transmittance of 40% or more means that, when the absorbance of the member to be measured (e.g., the adhesive layer 23) is measured, the transmittance is 40% or more over the entire wavelength range of 400 nm or more and 700 nm or less. The absorbance measurement is performed using a known spectrophotometer (V-670 spectrometer manufactured by JASCO Corporation).

[0047] The adhesive used for the adhesive layer 23 is not particularly limited and may be a heat-sensitive adhesive, a pressure-sensitive adhesive (adhesive), or the like. The resin used for this adhesive may be, for example, at least one resin selected from the group consisting of acrylic resins, vinyl chloride resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymer resins, styrene-acrylic copolymer resins, polyester resins, and polyamide resins. Alternatively, a two-component curing polyurethane adhesive or polyester adhesive using an isocyanate or the like as a curing agent may be used. In this case, the adhesive layer 23 may be formed by gravure printing, screen printing, reverse coating using a gravure plate, or the like. The thickness of the adhesive layer 23 may be, for example, 1 μm or more and 100 μm or less.

[0048] <<<Glass plate>>> The glass plate 24 is a member for protecting the picture layer 22. The glass plate 24 is provided over the entire area of ​​the decorative sheet 20, and covers the picture layer 22.

[0049] The glass plate 24 is made of inorganic glass having high light transmittance, which improves the transparency, scratch resistance, flame retardancy, and the like of the glass plate 24.

[0050] In this embodiment, the thickness t of the glass plate 24 is 30 μm or more and 200 μm or less. Having a thickness t of 30 μm or more suppresses cracking of the glass plate 24. Having a thickness t of 200 μm or less improves the flexibility of the decorative sheet 20. Therefore, the decorative sheet 20 can be attached to a curved surface. As a result, the decorative sheet 20 can be installed in a variety of installation locations. Having a thickness t of 200 μm or less of the glass plate 24 also shortens the distance from the first surface 24a (described below) of the glass plate 24 to the pattern layer 22. Therefore, the pattern of the pattern layer 22 can be clearly seen, creating a sense of unity with the pattern. Furthermore, having a thickness t of 200 μm or less of the glass plate 24 reduces the weight of the decorative sheet 20. This reduces the workload during installation and the burden on the structure to which the decorative sheet 20 is attached.

[0051] When the thickness t of the glass plate 24 is 200 μm, the glass plate 24 can be bent so that the radius of curvature is approximately 146 mm. When the thickness t of the glass plate 24 is 100 μm, the glass plate 24 can be bent so that the radius of curvature is approximately 73 mm. When the thickness t of the glass plate 24 is 30 μm, the glass plate 24 can be bent so that the radius of curvature is approximately 22 mm. Here, the radius of curvature refers to the radius of curvature of the surface that becomes the inner side when the glass plate 24 is bent.

[0052] The glass plate 24 has a first surface 24a facing away from the pattern layer 22 and a second surface 24b facing the pattern layer 22. Of these, the first surface 24a constitutes the surface (the surface facing the viewer) of the decorative material 10 and the decorative sheet 20. In this embodiment, the surface roughness Ra of the first surface 24a of the glass plate 24 is 0.2 nm or less. This makes it possible to suppress light scattering on the first surface 24a of the glass plate 24. Furthermore, since the surface roughness Ra of the first surface 24a is 0.2 nm or less, the first surface 24a of the glass plate 24 can ensure excellent specularity. This improves the design of the decorative sheet 20. Furthermore, since the surface roughness Ra of the first surface 24a is 0.2 nm or less, the glass plate 24 is less likely to break when bent. This improves the bendability of the decorative sheet 20. The surface roughness Ra is determined in accordance with JIS B 0601:2013 using a laser microscope (Keyence Corporation, VK-X250 (control unit), VK-X260 (measurement unit), laser wavelength 408 nm). The surface roughness Ra is the arithmetic mean of five measurements. The five measurements are taken at five measurement positions on the measurement sample to be evaluated. The five measurement positions are at least 10 mm apart from each other.

[0053] The surface roughness Ra of the second surface 24b of the glass plate 24 may be 0.2 nm or less. In this case, the surface roughness Ra of the first surface 24a and the surface roughness Ra of the second surface 24b are each 0.2 nm or less. This further improves the transparency of the glass plate 24. This further improves the design of the decorative sheet 20. In addition, since the surface roughness Ra of the second surface 24b is 0.2 nm or less, the glass plate 24 is even less likely to break when bent, and the bendability of the decorative sheet 20 is further improved.

[0054] The glass plate 24 can be produced by, for example, an overflow method. By producing the glass plate 24 by the overflow method, it is possible to obtain a desired thickness t and surface roughness Ra.

[0055] In such a decorative sheet 20, the total thickness T of the base layer 21, the pattern layer 22, the adhesive layer 23, and the glass plate 24 is 4 μm or more and 100 μm or less. Having a total thickness T of 4 μm or more makes it possible to prevent the decorative sheet 20 from breaking during installation, etc. Furthermore, having a total thickness T of 100 μm or less makes it possible to reduce the amount of pressure applied when the glass plate 24 is pressed toward the base layer 21. This makes it possible to prevent the glass plate 24 from cracking when the glass plate 24 is pressed toward the base layer 21.

[0056] As described above, according to this embodiment, the decorative sheet 20 includes a base layer 21, a pattern layer 22 laminated on the base layer 21, and a glass plate 24 covering the pattern layer 22. The thickness t of the glass plate 24 is 30 μm or more and 200 μm or less. Having a thickness t of 30 μm or more in this way can prevent the glass plate 24 from cracking. Having a thickness t of 200 μm or less in the glass plate 24 can improve the flexibility of the decorative sheet 20. Therefore, the decorative sheet 20 can be attached to a member having a curved surface. As a result, the decorative sheet 20 can be installed in a variety of installation locations. Having a thickness t of 200 μm or less in the glass plate 24 can reduce the weight of the decorative sheet 20. Therefore, the workload during installation can be reduced, and the burden on the structure to which the decorative sheet 20 is attached can be reduced.

[0057] Furthermore, according to this embodiment, the surface roughness Ra of the first surface 24a of the glass plate 24 is 0.2 nm or less. This makes it possible to suppress light scattering on the first surface 24a of the glass plate 24. Furthermore, since the surface roughness Ra of the first surface 24a is 0.2 nm or less, the first surface 24a of the glass plate 24 can ensure excellent specularity. This improves the design of the decorative sheet 20. Furthermore, since the surface roughness Ra of the first surface 24a is 0.2 nm or less, the glass plate 24 is less likely to break when bent. This improves the bendability of the decorative sheet 20.

[0058] <Application> The decorative material 10 and decorative sheet 20 of the present disclosure can be used in a variety of applications, including the following (1) to (9) as specific examples of applications. (1) Surface materials for interior walls, floors, ceilings, etc. of buildings such as houses, offices, stores, hospitals, and clinics. (2) Surface materials for exterior parts such as exterior walls, roofs, eaves ceilings, door pockets, etc. of buildings such as houses, offices, stores, hospitals, and clinics. (3) Surface materials for building fixtures such as windows, window frames, doors, and door frames (interior or exterior parts); surface materials for fixture accessories (handles, etc.); surface materials for building fixture jigs. (4) Surface materials for fixtures such as handrails, waist walls, moldings, thresholds, lintels, and top boards. (5) Surface materials for outdoor (exterior) parts such as fences, gates, drying rack pillars and handrails. (6) Surface materials for furniture such as chests of drawers, desks, chairs, cupboards, kitchen sinks, etc.; surface materials for furniture accessories (handles, etc.); surface materials for furniture fixtures. (7) Surface materials for the housings of various home appliances such as television receivers, radio receivers, refrigerators, microwave ovens, washing machines, electric fans, and air conditioners; surface materials for accessories of home appliances (handles, switches, touch panels, etc.); surface materials for fixtures of home appliances. (8) Surface materials for office automation equipment such as electronic copying machines, facsimiles, printers, personal computers, and other computing equipment; surface materials for the housings of various office automation equipment such as ATM machines at financial institutions such as banks and post offices; surface materials for accessories of various office automation equipment (keyboards, touch panels, etc.); surface materials for jigs of various office automation equipment. (9) Surface materials for the interior or exterior parts (walls, floors, ceilings, handrails, supports, control panels, levers, handles, steering wheels, and other control equipment) of vehicles such as automobiles, railway cars, ships, and aircraft. [Example]

[0059] Next, the operation of the above-described embodiment will be specifically described.

[0060] Example 1 A decorative sheet 20 shown in FIG. 1 was produced.

[0061] In this case, first, a polyethylene terephthalate film (thickness: 20 μm) was prepared as the base layer 21.

[0062] Next, a design layer 22 (thickness: 5 μm) was formed on the polyethylene terephthalate film serving as the base layer 21 by gravure printing.

[0063] Also, a glass plate 24 (G-Leaf (product name), 50 μm thick, manufactured by Nippon Electric Glass Co., Ltd.) was prepared. The surface roughness Ra of the first surface 24a of this glass plate 24 was 0.2 nm, and the surface roughness Ra of the second surface 24b was 0.2 nm.

[0064] Next, using an adhesive (adhesive layer 23 (acrylic resin)), a glass plate 24 was laminated on the pattern layer 22. In this way, the decorative sheet 20 shown in FIG. 1 was produced.

[0065] Example 2 A decorative material 10 shown in FIG. 1 was produced.

[0066] In this case, first, in the same manner as in Example 1, the decorative sheet 20 shown in FIG.

[0067] Furthermore, as the support 15, a steel plate (thickness: 1000 μm) was prepared.

[0068] Next, a steel plate was laminated as a support 15 onto the decorative sheet 20 using an adhesive (acrylic resin). In this way, the decorative material 10 shown in FIG. 1 was produced.

[0069] (Comparative Example 1) A decorative sheet was produced in the same manner as in Example 1, except that the thickness of the glass plate was 500 μm.

[0070] (Comparative Example 2) A decorative sheet was produced in the same manner as in Example 1, except that a resin film (polyethylene terephthalate film (thickness: 50 μm)) was used instead of the glass plate.

[0071] (1) Bending test The decorative sheet according to Example 1, the decorative material according to Example 2, the decorative sheet according to Comparative Example 1, and the decorative sheet according to Comparative Example 2 were bent along a curved surface with a curvature radius of 200 mm, and the presence or absence of cracks in the glass plate or resin film was checked.

[0072] (2) Visibility evaluation The total light reflectance of the decorative sheet according to Example 1, the decorative material according to Example 2, the decorative sheet according to Comparative Example 1, and the decorative sheet according to Comparative Example 2 was measured. Total light reflectance is the sum of diffuse reflectance and specular reflectance. A light source simulating the spectrum of D65 standard light (hereinafter referred to as the D65 light source) was used to measure total light reflectance. The wavelength range of light used to measure total light reflectance (%) was 380 nm to 780 nm. Before measuring the total light reflectance of the sample, the D65 light source was turned on for 15 minutes to stabilize the output of the D65 light source. The incident angle on the sample when measuring total light reflectance was 7°. The incident surface when measuring total light reflectance was the first surface of the glass plate. For the sample according to Comparative Example 2, the incident surface when measuring total light reflectance was the surface of the resin film corresponding to the first surface of the glass plate. The test environment for measuring total light reflectance was a temperature of 23°C ± 2°C and a relative humidity of 50% ± 5%. The sample was left in the test environment for 16 hours before the test began. Other measurement conditions for measuring the total light transmittance were in accordance with JIS K7375: 2008. Then, the visibility (specularity) was evaluated from the measured total light reflectance.

[0073] (3) Scratch resistance evaluation The scratch resistance of the decorative sheet according to Example 1, the decorative material according to Example 2, the decorative sheet according to Comparative Example 1, and the decorative sheet according to Comparative Example 2 was evaluated. First, 50 mm x 100 mm samples were cut out from the glass plate of the decorative sheet according to Example 1, the glass plate of the decorative material according to Example 2, and the glass plate of the decorative sheet according to Comparative Example 1. Also, a 50 mm x 100 mm sample was cut out from the resin film of the decorative sheet according to Comparative Example 2. Next, the samples were visually inspected for the absence of any abnormalities such as dust or scratches.

[0074] Next, the total luminous transmittance (%) of the samples according to each example was measured. A D65 light source was used for measuring the total luminous transmittance. Before measuring the total luminous transmittance of the sample, the D65 light source was turned on for 15 minutes to stabilize the output of the D65 light source. The incident angle to the sample when measuring the total luminous transmittance was 0°. The incident surface when measuring the total luminous transmittance was the first surface of the glass plate. For the sample according to Comparative Example 2, the incident surface when measuring the total luminous transmittance was the surface of the resin film corresponding to the first surface of the glass plate. The test environment when measuring the total luminous transmittance was a temperature of 23°C ± 2°C and a relative humidity of 50% ± 5%. The sample was placed in the test environment for 16 hours before starting the test. Other measurement conditions when measuring the total luminous transmittance were in accordance with JIS K7361-1:1997.

[0075] The total light transmittance was calculated as the arithmetic mean of five measurements. The five measurements were taken at five measurement positions on the sample to be evaluated. The five measurement positions were at least 10 mm apart from each other. The total light transmittance was measured using a haze meter "HM-150" manufactured by Murakami Color Research Laboratory.

[0076] Next, a rubber abrasion resistance test was carried out on the samples according to each example using the following method. The sliding piece was a "Jumbo Wearaser (registered trademark) CS-6" manufactured by Taber. For the rubber abrasion resistance test, a Gakushin-type abrasion fastness tester "AB-301-S" manufactured by Tester Sangyo Co., Ltd. was used.

[0077] The rubber abrasion resistance test is an index that indicates the resistance to defects such as scratches that occur when rubber is pressed against a test sample to be evaluated and moved relative to it. For the rubber abrasion resistance test, a rectangular sample is spread out horizontally on the testing machine, taking care not to wrinkle or warp. The four corners of the spread sample are fixed to the testing machine using mending tape. The mending tape may be "810-3-18" manufactured by 3M.

[0078] The sliding piece, "Jumbo Wearaser (registered trademark) CS-6," is a material whose main component is rubber. The sliding piece, CS-6, has a roughly cylindrical shape. The tip surface of the cylindrical shape of this sliding piece is brought into contact with the incident surface when measuring the total light transmittance. The contact area between the test sample and the sliding piece is a circle with a diameter of 12 mm.

[0079] The sliding piece CS-6 is held by a holder. The holder is fixed to the cylindrical side of the sliding piece. When CS-6 is held by the holder, the tip of the cylindrical piece protrudes only 2 mm from the holder. By limiting the length of CS-6 protruding from the holder, the deformation of CS-6 during testing is limited. The sliding piece held by the holder is pressed from above in the vertical direction against the test sample, which is spread out along a horizontal plane. The load pressing the sliding piece against the test sample is 200 g.

[0080] With the slider pressed against the test sample from above in the vertical direction, the slider and sample are moved relative to each other in the horizontal direction. The relative movement is a reciprocating motion. The reciprocating motion cycle is 500 times. The reciprocating motion speed is 200 mm / sec. The stroke of the reciprocating motion is 50 mm both on the outward and return paths. The reciprocating motion is in a direction parallel to the long side of the sample.

[0081] The test environment shall be 23°C ± 2°C and 50% ± 5% relative humidity. The test samples shall be left in the test environment for 16 hours before the start of the test.

[0082] Before conducting the test on the evaluation target, the preparation sample is rubbed with CS-6 to perform CS-6 pretreatment. The testing machine used to test the evaluation target sample is also used for CS-6 pretreatment. The preparation sample is a Toyobo "single-sided easy-adhesion type: A4160" sample. The preparation sample is spread out horizontally, and the four corners of the side of the preparation sample that has not been treated for easy adhesion (the side with the exposed PET) are fixed to the testing machine with mending tape. CS-6 is pressed vertically onto the preparation sample from above. The contact area between the preparation sample and CS-6 is a circle with a diameter of 12 mm. The load used to press CS-6 onto the preparation sample is 600 g. The CS-6 pressed against the preparation sample is moved horizontally relative to the preparation sample. The relative movement is a reciprocating motion. The reciprocating motion cycle is 150 times. The reciprocating motion speed is 220 mm / sec. The stroke of the reciprocating motion is 50 mm for both the forward and backward movements. The CS-6 pressed against the preparation sample in this way is used for the test to be evaluated. The test is conducted after confirming that the surface of the pressed CS-6 is free of rubber shavings and is flat.

[0083] After the rubber abrasion resistance test, the sample was removed from the tester and the total light transmittance was measured by the method described above. The scratch resistance was evaluated based on the difference between the total light transmittance before the rubber abrasion resistance test and the total light transmittance after the rubber abrasion resistance test.

[0084] (4) Flame retardancy evaluation The decorative sheet according to Example 1, the decorative material according to Example 2, the decorative sheet according to Comparative Example 1, and the decorative sheet according to Comparative Example 2 were heated to 300°C to check whether they ignited or not.

[0085] The results are shown in Table 1. Table 1 shows the results of the bending test. Table 2 shows the results of the visibility evaluation. Table 3 shows the results of the scratch resistance evaluation. Table 4 shows the results of the flame retardancy evaluation.

[0086] [Table 1]

[0087] [Table 2]

[0088] [Table 3]

[0089] [Table 4]

[0090] As a result, as shown in Table 1, cracks occurred in the glass plate in the decorative sheet of Comparative Example 1. In contrast, no cracks occurred in the glass plate in the decorative sheet of Example 1 or the decorative material of Example 2. Therefore, according to the present embodiment, even when a glass plate is used, cracks in the glass plate can be suppressed, and it was found that the flexibility of the decorative sheet can be improved, similar to when a resin film is used for the decorative sheet.

[0091] Furthermore, as shown in Table 2, the decorative sheet according to Comparative Example 2, which used a resin film, had a total light reflectance of 0.8%. In contrast, the decorative sheet according to Example 1 and the decorative material according to Example 2, which used a glass plate, had a total light reflectance of 8%. Therefore, it was found that according to this embodiment, the decorative sheet and decorative material can ensure excellent specularity, thereby improving the design of decorative sheets and the like.

[0092] Furthermore, as shown in Table 3, in the decorative sheet according to Comparative Example 2, which used a resin film, the total light transmittance was 95% before the rubber abrasion resistance test, but was 49% after the rubber abrasion resistance test, a decrease of 46%. In other words, in the decorative sheet according to Comparative Example 2, scratches occurred in the resin film during the rubber abrasion resistance test, resulting in a significant decrease in total light transmittance. In contrast, in the decorative sheet according to Example 1 and the decorative material according to Example 2, which used a glass plate, the total light transmittance was 90% before the rubber abrasion resistance test, but was 88% after the rubber abrasion resistance test, a decrease of only 2%. Therefore, it was found that according to this embodiment, the scratch resistance of decorative sheets and the like can be improved.

[0093] Furthermore, as shown in Table 4, the decorative sheet according to Comparative Example 2, which used a resin film, ignited when heated to 300° C. In contrast, the decorative sheets according to Examples 1 and 2, which used glass plates, did not ignite even when heated to 300° C. This demonstrates that the present embodiment can improve the flame retardancy of decorative sheets and the like.

[0094] The components disclosed in the above-described embodiment and each modification may be combined as needed, or some components may be omitted from all the components shown in the above-described embodiment and each modification. [Explanation of symbols]

[0095] 10 Cosmetic materials 15 Support 20 Decorative Sheet 21 Base material layer 22 Picture layer 23 Adhesive layer 24 Glass Plate 24a 1st page 24b 2nd side

Claims

1. a substrate layer; A pattern layer laminated on the base layer; a glass plate covering the pattern layer; The thickness of the glass plate is 30 μm or more and 200 μm or less, The decorative sheet has a surface roughness Ra of 0.2 nm or less on the surface of the glass plate facing away from the picture layer.

2. 2. The decorative sheet according to claim 1, wherein the surface of said glass plate facing said pattern layer has a surface roughness Ra of 0.2 nm or less.

3. Further, an adhesive layer is provided to bond the pattern layer and the glass plate to each other, 2. The decorative sheet according to claim 1, wherein the adhesive layer has a visible light transmittance of 40% or more.

4. 4. The decorative sheet according to claim 3, wherein the total thickness of the substrate layer, the pattern layer, the adhesive layer, and the glass plate is 4 μm or more and 100 μm or less.

5. The decorative sheet according to any one of claims 1 to 4, A decorative material comprising a support joined to the decorative sheet.

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