Decorative sheet, decorative tack sheet, decorative board, and method for manufacturing decorative sheet

Abstract

The present invention provides a decorative sheet, a decorative tack sheet, a decorative panel, and a manufacturing method for decorative sheets. The present invention can reduce the number of production steps and provide a thin but hard decorative sheet, by adding a nano-sized dispersant as an additive. This decorative sheet (10): has a printed pattern layer (50) upon which a pattern is printed, formed on the rear surface side of a transparent original plate (20) comprising a transparent olefin sheet; has a surface protection layer (60) formed on the surface side of the transparent original plate (20); and does not have a laminate layer comprising another film, on either the surface side or the rear surface side of the transparent original plate (20). The transparent original plate (20) has added thereto a dispersant as a nano-sized additive. The rear surface side of the transparent original plate (20) may have a printed pattern layer (50) and a concealing layer (colored layer 40) formed, in order, thereupon and may have a primer layer (30) formed on the side furthest away from the printed pattern layer (50).

Description

Technical Field

[0001] The present invention relates to, for example, a decorative sheet, a decorative tack sheet, a decorative board, and a method for manufacturing a decorative sheet that are used indoors, attached to the surface of fittings, building materials, etc., and used by matching the patterns of fittings and building materials for each house or room. The present invention can not only reduce the number of manufacturing steps but also provide a hard decorative sheet even with a thin film by adding a dispersant as a nano-sized additive.

Background Art

[0002] Conventionally, in recent years, decorative sheets made of olefin-based materials have been mainly used due to the problem of gas during combustion (see Patent Documents 1 to 3). In order to protect the pattern from surface wear, a multi-layered decorative sheet is widely used, in which a transparent olefin sheet is laminated on a printed sheet on a colored olefin sheet (see paragraph

[0034] and FIG. 1 of Patent Document 2, and paragraph

[0059] and FIG. 1 of Patent Document 3).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] The production of the above-mentioned conventional decorative sheets has a first problem in that a printing process and a lamination process are required. In view of the first problem, the present invention makes the decorative sheet a single-layer film printed on the back surface of a transparent olefin sheet, thereby eliminating the lamination process and reducing the number of manufacturing steps from printing to applying a surface protective layer, making it possible to automate the process into a single in-line process. As a result, the present invention has the advantage that the design can be harmonized with the surface protective layer by applying a gloss / matt coat as needed.

[0005] Furthermore, conventional materials, due to their multi-layered structure, face a second problem: limitations in film formation when thinning the sheet, and the inability to achieve the desired sheet hardness. Furthermore, conventional materials have a third problem: due to limitations in film formation, the thin film stretches, making printing alignment difficult, resulting in insufficient sheet rigidity and inferior surface properties when used as decorative panels.

[0006] In view of the first to third problems described above, the present invention makes it easy to create a thin film by using a single layer, and further makes it possible to harden the sheet even in a thin film by adding a dispersant as a nano-sized additive. [Means for solving the problem]

[0007] A decorative sheet according to one aspect of the present invention is characterized in that a printed pattern layer is formed on the back side of a transparent base material made of a transparent olefin sheet, a surface protective layer is formed on the front side of the transparent base material, and neither the front nor the back side of the transparent base material has a laminate layer made of another film, and the transparent base material is provided with a dispersant as a nano-sized additive. Furthermore, a decorative sheet according to one aspect of the present invention is characterized in that the printed pattern layer and the concealing layer are formed in order on the back side of the transparent raw material. A decorative sheet according to one aspect of the present invention is characterized in that a primer layer is formed on the back side of the transparent base material, on the side furthest from the printed pattern layer.

[0008] A decorative sheet according to one aspect of the present invention is a decorative sheet in which only a printed pattern layer and an opacity layer are formed in this order on the back side of a transparent base material made of a transparent olefin sheet, and only a surface protection layer is formed on the front side of the transparent base material, wherein a dispersant as a nano-sized additive is added to the transparent base material. A decorative sheet according to one aspect of the present invention is a decorative sheet in which only a printed pattern layer, an opacity layer, and a primer layer are formed in this order on the back side of a transparent base material made of a transparent olefin sheet, and only a surface protection layer is formed on the front side of the transparent base material, wherein a dispersant as a nano-sized additive is added to the transparent base material.

[0009] A decorative sheet according to one aspect of the present invention is characterized in that the transparent base material is a two-type, three-layer structure in which a transparent skin layer, a transparent core layer, and the transparent skin layer are laminated in that order. A decorative sheet according to one aspect of the present invention is characterized in that the dispersant is added to the transparent skin layer. A decorative sheet according to one aspect of the present invention is characterized in that it has a sealer layer between the back side of the transparent base material and the printed pattern layer to improve adhesion with the printed pattern layer.

[0010] A decorative sheet according to one aspect of the present invention is characterized in that the dispersant as a nano-sized additive contains nucleating agent vesicles in which a nano-sized nucleating agent is encapsulated within the vesicles. A decorative sheet according to one aspect of the present invention is characterized in that an inorganic filler is added to the transparent skin layer. A decorative sheet according to one aspect of the present invention is characterized in that an embossed portion synchronized with the pattern is formed on the surface side of the surface protective layer. A decorative sheet according to one aspect of the present invention is characterized in that the embossed portion extends from the surface side of the surface protective layer toward the transparent base material, and a portion of it penetrates the transparent base material. A decorative sheet according to one aspect of the present invention is characterized in that the printed pattern layer is monochromatic.

[0011] A decorative tack sheet according to one aspect of the present invention is characterized in that it has an adhesive layer and a release liner on the side of the primer layer of the decorative sheet. A decorative panel according to one aspect of the present invention is characterized in that a substrate is bonded to the side of the primer layer of the decorative sheet.

[0012] A method for manufacturing a decorative sheet according to one aspect of the present invention comprises: a first step of manufacturing a transparent base material by extruding a transparent polyolefin-based thermoplastic resin with a dispersant as a nano-sized additive added; a second step of forming a printed pattern layer on the back side of the transparent base material manufactured in the first step; and a third step of forming a surface protective layer on the front side of the transparent base material after or before the second step, and is characterized by being manufactured in line.

[0013] A method for manufacturing a decorative sheet according to one aspect of the present invention comprises: a first step of manufacturing a transparent base material by extruding a transparent core layer made of a transparent polypropylene-based thermoplastic resin and transparent skin layers located on the front and back sides of the transparent core layer, respectively, to which a dispersant as a nano-sized additive has been added to the thermoplastic resin; a second step of forming a printed pattern layer on the back side of the transparent base material manufactured in the first step; and a third step of forming a surface protection layer on the front side of the transparent base material after or before the second step, and is characterized by being manufactured in line.

[0014] A method for manufacturing a decorative sheet according to one aspect of the present invention is characterized in that, in the second step, the printed pattern layer and the concealing layer are formed in this order on the back side of the transparent raw material. A method for manufacturing a decorative sheet according to one aspect of the present invention is characterized in that, in the second step, a primer layer is formed on the back side of the transparent raw material, on the side furthest from the printed pattern layer. A method for manufacturing a decorative sheet according to one aspect of the present invention is characterized in that, in the first step, the dispersant as a nano-sized additive includes a nucleating agent vesicle in which a nano-sized nucleating agent is encapsulated within the vesicle. [Effect of the Invention]

[0015] According to one aspect of the present invention, by adding a dispersant as a nano-sized additive, not only can the number of manufacturing steps be reduced, but a hard decorative sheet can also be provided even with a thin film. [Brief Description of the Drawings]

[0016] [Figure 1] It is a cross-sectional view of the decorative sheet according to Embodiment 1. [Figure 2] It is a cross-sectional view of the decorative sheet according to Embodiment 2. [Figure 3] It is a cross-sectional view of the decorative sheet according to Embodiment 3. [Figure 4] It is a cross-sectional view of the decorative sheet according to Embodiment 4. [Modes for Carrying Out the Invention]

[0017] (Embodiment 1) An embodiment of the present invention (hereinafter referred to as "Embodiment 1") will be described below with reference to the drawings. Here, the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thicknesses of each layer, etc. are different from the actual ones. Further, the embodiments shown below are examples of configurations for embodying the technical idea of the present invention, and the technical idea of the present invention is not limited to the materials, shapes, structures, etc. of the components being the following. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

[0018] (Decorative Sheet 10 According to Embodiment 1) In FIG. 1, 10 is a decorative sheet. Although not shown, for example, it is used indoors and is pasted on the surfaces of fixtures (indoor doors, entrance storage), millwork (dividers, moldings, lintels, window frames, door frames), etc., and is used by matching the patterns of fixtures and millwork for each house or room. The decorative sheet 10 includes the following layers, and each layer is provided in order from (1). The following points (1) to (5) will be discussed later. (1) Primer layer 30 (2) Colored layer 40 (3) Printed pattern layer 50 (4) Transparent original fabric 20 (5) Surface protective layer 60

[0019] Furthermore, the layers of the decorative sheet 10 are not limited to (1) to (5) described above. For example, as shown in Figure 1, an adhesive layer 70 (6) and a release paper 80 (7) may be added to the side of the primer layer 30 to form a decorative tack sheet 11. Alternatively, an embossed portion 90 that matches the pattern of the printed pattern layer 50 may be formed on the surface side of the surface protection layer 60. Or, although not shown, a substrate may be bonded to the side of the primer layer 30 to form a decorative board. Furthermore, the above-mentioned "(1) Primer layer 30" may be omitted. In other words, if the above-mentioned "(2) Colored layer 40" has the function of a primer layer, the primer layer 30 can be omitted.

[0020] (Transparent original fabric 20) The transparent base material 20 serves as a support for the decorative sheet 10 and is made of a transparent olefin sheet. As shown in Figure 1, the transparent raw material 20 is manufactured with two types of three layers: a transparent skin layer 21, a transparent polypropylene core layer 22, and another transparent skin layer 21. The transparent skin layer 21 is formed by adding a nano-sized dispersant to a transparent polypropylene-based thermoplastic resin. In addition to the nano-sized dispersant, an inorganic filler is also added to the transparent skin layer 21.

[0021] (Main features of decorative sheet 10) The main features of the decorative sheet 10 according to this embodiment 1 are as follows: (1) The decorative sheet 10 according to this embodiment 1 is a single-layer film made of a transparent olefin sheet, on the back side of which a printed pattern layer 50, a coloring layer 40, and a primer layer 30 are sequentially formed, and on the front side of the transparent base material 20 is a surface protective layer 60, and neither the front nor the back side of the transparent base material 20 has a laminate layer made of another film. The transparent base material 20 is manufactured by extrusion molding using a transparent polypropylene-based thermoplastic resin so as to have a configuration of two types and three layers in the order of transparent skin layer 21, transparent core layer 22, and transparent skin layer 21, and a dispersant as a nano-sized additive is added to the transparent skin layer 21.

[0022] According to this embodiment 1, since there is no lamination process for other sheets during the manufacturing of the decorative sheet 10, the manufacturing process from printing to applying the surface protective layer 60 can be carried out in a single inline process. Furthermore, according to this embodiment 1, the surface protective layer 60 can be made to match the design by applying a gloss / matt coat as needed. Furthermore, according to this embodiment 1, conventional decorative sheets have multiple layers, which presents problems in terms of film formation limitations and the inability to achieve sufficient hardness when thinning the sheet. However, the decorative sheet 10 according to this embodiment 1 is single-layered, making it easy to thin, and by using nano-sized additives, the sheet can be made hard even when thin.

[0023] (2) The decorative sheet 10 according to this embodiment 1 has an inorganic filler added in addition to a dispersant as a nano-sized additive. According to this embodiment 1, further thinning and improved scratch resistance can be achieved. (3) The decorative sheet 10 according to this embodiment 1 has an embossed portion 90 that is in harmony with the pattern of the printed pattern layer 50. According to this embodiment 1, while conventional decorative sheets are multi-layered, making it difficult to synchronize the application of the printed pattern layer 50 with the surface protective layer 60 on the surface of the laminate film, synchronization can be easily achieved by applying the pattern printing and embossed portion 90 in-line to the front and back sides of the transparent olefin sheet transparent base material 20.

[0024] (4) According to this embodiment 1, firstly, by making the frame material a single color, it is possible to prepare in advance for whatever door pattern is inside, so the door pattern can be decided later, and when the door needs to be changed due to aging, it is possible to change only the door without having to demolish and replace the frame material. Of course, the door itself can also be a single color. Secondly, according to this embodiment 1, even in apartments, it is easier to increase the lot size and increase productivity and lower the unit price by unifying all rooms with a single color, so there are advantages to using a single-color sheet. Furthermore, according to this embodiment 1, thirdly, if you want to change the finish to a wood grain pattern after it has been finished in white, the decorative sheet 10 according to this embodiment 1 is thin but rigid, so it is possible to change it to a wood grain pattern later. For example, if you later want to change the surface of a white-finished decorative panel to a wood-grain pattern, you can do so by applying the decorative tack sheet 11 according to this embodiment 1 on top of it.

[0025] (5) In this embodiment 1, since the colored layer 40 of the decorative sheet 10 is transparent or semi-transparent, when applied to a base that is natural wood or a wood-grain sheet, it is possible to improve performance and further enhance the design while making use of the base design. (6) The decorative tack sheet 11 according to this embodiment 1 has an adhesive layer 70 and a release paper 80 on the side of the primer layer 30, so it can be bonded easily and quickly.

[0026] (7) The decorative panel according to this embodiment 1 can be used as a decorative panel easily and quickly because the substrate is bonded to the side of the primer layer 30. (8) A high-performance decorative sheet 10 can be manufactured simply and quickly using the manufacturing method of the decorative sheet 10 according to this embodiment 1.

[0027] (Primer layer 30) As shown in Figure 1, the primer layer 30 is located on the back side of the transparent base material 20 and is provided primarily for the purpose of improving adhesion. In addition to improving adhesion, the functions of the primer layer 30 also include stabilizing the surface after surface treatment, preventing corrosion of the metal surface, imparting tackiness, and preventing deterioration of the adhesive. The primer layer 30 has a solid content of 1 g / m², for example, obtained by gravure printing. 2 It is formed by coating it with a urethane-based resin.

[0028] (Colored layer 40) As shown in Figure 1, the colored layer 40 is located on the surface of the primer layer 30, formed using a printing method, and is an opacity layer primarily provided to impart opacity. The colored layer 40 is printed, for example, using a two-component urethane resin by gravure printing. Note that the colored layer 40 may also be a solid color layer.

[0029] (Printed image layer 50) As shown in Figure 1, the printed pattern layer 50 is located on the surface of the colored layer 40, formed using a printing method, and is provided for the purpose of adding design to the decorative sheet 10. The printed pattern layer 50 is formed by printing a pattern using a urethane-based resin, for example, by gravure printing. While gravure printing was given as an example of a printing method, it is not limited to this, and various other printing methods such as offset printing, letterpress printing, flexographic printing, screen printing, inkjet printing, and electrostatic printing can be applied.

[0030] The type of pattern in the printed pattern layer 50 is arbitrary and depends on the intended use and user preference, but common examples include wood grain, stone patterns, and abstract patterns. The type of pattern is not limited to the examples given above; for example, it could be a solid color print covering the entire surface. Printing inks used in this printing method include, for example, vinyl chloride-based inks (cyan, magenta, and yellow). While urethane resins were used as an example of printing ink, the ink is not limited to this. For example, it may also be a coloring agent such as an organic or inorganic dye or pigment, or it may be dispersed in a binder made of synthetic resin, along with appropriate additives such as fillers, tackifiers, plasticizers, stabilizers, dispersants, defoamers, leveling agents, surfactants, and drying agents, as well as solvents or diluents.

[0031] (Surface protective layer 60) The surface protective layer 60, also called the topcoat, is located on the surface side of the transparent base material 20, as shown in Figure 1, and is formed using a printing method. It is provided for the purpose of imparting surface properties such as abrasion resistance and water resistance. As shown in Figure 1, the surface protection layer 60 consists of a primer layer 61 applied to the surface of the transparent raw material 20, and a topcoat layer 62 applied to the surface of the primer layer 61, which has a higher gloss than the primer layer 61.

[0032] The undercoat layer 61 is made by applying a two-component acrylic curing resin (acrylic urethane resin manufactured by DIC Graphics Co., Ltd.) to a thickness of 6 μm. The top coat layer 62 is made of the same resin but with a higher gloss finish, and is printed with a design that matches the printed design layer 50. In other words, by applying a gloss / matte coat to the surface protective layer 60, it is possible to synchronize it with the design.

[0033] Furthermore, an embossed portion 90 that matches the pattern of the printed pattern layer 50 may be formed on the surface of the topcoat layer 62. Here, the term "embossed area 90" might conjure up an image of a significant height difference, but in reality, the height difference between the undercoat 61 and the topcoat layer 62, which is synchronized with the design, is only on the order of a few micrometers. Applying a gloss / matt coat to the surface protective layer 60 is equivalent to saying that it is synchronized with the design.

[0034] Furthermore, the surface protective layer 60 is treated with an antiviral agent. For antiviral treatment, an antiviral agent is added to the surface protective layer 60. As an antiviral agent, for example, a silver-based inorganic additive (Bioside TB-B100) manufactured by Taisho Technos Co., Ltd., which is supported with silver ions, is used. Here, since the surface protective layer 60 is composed of an undercoat layer 61 and a topcoat layer 62, the antiviral agent may be added to both the undercoat layer 61 and the topcoat layer 62, or it may be applied only to the topcoat layer 62 located on the surface side of the surface protective layer 60. Although an antiviral agent was added to the surface protective layer 60, the method is not limited to this, and an antiviral agent may also be applied to the surface side of the surface protective layer 60, or at least to the surface of the topcoat layer 62.

[0035] (Transparent core layer 22) Although the transparent base material 20 is depicted in the drawing as having a transparent core layer 22 and a transparent skin layer 21 forming separate layers, in reality the transparent core layer 22 and the transparent skin layer 21 are continuous, and it is a single-layer sheet with no interface. For the transparent core layer 22, for example, a transparent polypropylene resin blended with a weather-resistant agent is used. The transparent raw material 20 is composed of a single-layer film (transparent skin layer 21 / transparent core layer 22 / transparent skin layer 21) made of a transparent olefin sheet, but is not limited to this. For example, it may be composed of a single-layer film (transparent layer) made of a transparent olefin sheet, although this is not shown in the diagram. In this case, the single-layer film (transparent layer) corresponds to the transparent raw material 20. The "transparent layer" of the above single-layer film (transparent layer), like the transparent skin layer 21 described later, has a dispersant added as a nano-sized additive. In addition, the "transparent layer" also has a weather-resistant agent blended in, like the transparent core layer 22 described later.

[0036] (Transparent skin layer 21) The transparent skin layer 21 uses a transparent polypropylene resin with an inorganic filler added in addition to a dispersant as a nano-sized additive. A transparent raw material 20 is produced with a total thickness of 50 μm by simultaneously extruding a transparent skin layer 21, a transparent core layer 22, and another transparent skin layer 21 in a thickness ratio of 0.5:9:0.5.

[0037] (Resin material of the transparent core layer 22) Examples of the resin material constituting the transparent core layer 22 include thermoplastic resins. There are no particular restrictions on the thermoplastic resin, and materials similar to those used as the base layer in conventional decorative sheets 10 can be used.

[0038] Examples of thermoplastic resins include polyolefin resins such as polyethylene, polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, ethylene-α-olefin copolymer, and propylene-α-olefin copolymer; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytetramethylene terephthalate, polyethylene naphthalate, polyethylene terephthalate-isophthalate copolymer, 1,4-cyclohexanedimethanol copolymer polyethylene terephthalate, polyarylate, and polycarbonate; and olefin resins such as ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-(meth)acrylic acid (ester) copolymer, and ethylene-unsaturated carboxylic acid copolymer metal neutralized products (ionomers). Polyolefin resins such as ion copolymer resins, acrylic resins such as poly(meth)acrylonitrile, polymethyl(meth)acrylate, polyethyl(meth)acrylate, polybutyl(meth)acrylate, and polyacrylamide, polyamide resins such as 6-nylon, 6,6-nylon, and 6,10-nylon, styrene resins such as polystyrene, AS resin, and ABS resin, vinyl resins such as polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, and polyvinyl butyral, fluorine resins such as polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, and ethylene-perfluoroalkyl vinyl ether copolymer, or mixtures, copolymers, composites, and laminates of two or more of these can be used.

[0039] In particular, given the growing social concern for environmental issues in recent years, it is undesirable to use thermoplastic resins containing chlorine (halogen), such as polyvinyl chloride resin, as thermoplastic resins, and it is preferable to use non-halogen thermoplastic resins. In particular, from the standpoint of various physical properties, processability, versatility, and economic efficiency, it is most preferable to use polyester resins (amorphous or biaxially oriented) or polyolefin resins, especially polyolefin resins, as non-halogenated thermoplastic resins. For example, as the polyolefin resin, it is preferable to use a polypropylene resin containing 30% to 100% by mass of highly crystalline homopolypropylene resin with an isotactic pentad fraction (mmmm fraction) of 95% or more. The transparent core layer 22 may contain, if necessary, one or more additives selected from various sources such as fillers, ultraviolet absorbers, light stabilizers, heat stabilizers, antioxidants, antistatic agents, lubricants, flame retardants, antibacterial agents, antifungal agents, friction reducers, light scattering agents, and gloss adjusters.

[0040] (Resin material of transparent skin layer 21) Examples of resin materials that constitute the transparent skin layer 21 include thermoplastic resins. There are no particular restrictions on the thermoplastic resin, and the same resin material as that used for the transparent core layer 22 can be used.

[0041] (Nano-sized additives, etc. (nucleating agents)) The transparent skin layer 21 contains a dispersant as a nano-sized additive, as well as an inorganic filler, which is hereafter referred to as a "nano-sized nucleating agent." It is preferable that the nano-sized nucleating agent be added to the polypropylene resin in the form of a nucleating agent vesicle, which is encapsulated within a vesicle having a single-layer outer membrane. Furthermore, in this embodiment 1, the nucleating agent in the resin constituting the transparent skin layer 21 may be encapsulated within the vesicle with a portion of the nucleating agent exposed. Since the transparent skin layer 21 contains a nucleating agent, the degree of crystallinity can be improved, and the scratch resistance (scratch resistance) of the decorative sheet 10 can be improved.

[0042] (Particle size of nano-sized nucleating agent) The nano-sized nucleating agent preferably has an average particle size of 1 / 2 or less of the wavelength range of visible light. Specifically, since the wavelength range of visible light is 400 nm to 750 nm, it is preferable that the average particle size be 375 nm or less. Because nano-sized nucleating agents have extremely small particle sizes, the number of nucleating agents per unit volume and their surface area increase inversely proportional to the cube of the particle diameter. As a result, the distance between each nucleating agent particle becomes smaller, so when crystal growth occurs from the surface of one nucleating agent particle added to the resin, the growing edge of the crystal immediately comes into contact with the edge of a crystal growing from the surface of another nucleating agent particle adjacent to that particle. The edges of the crystals inhibit each other's growth, stopping the growth of each crystal. Therefore, the average particle size of spherulites in the crystalline portion of a crystalline resin can be reduced, for example, to 1 μm or less.

[0043] As a result, a high-hardness resin film with a high degree of crystallinity can be produced, and the stress concentration between spherulites that occurs during bending is efficiently dispersed, thus enabling the realization of a resin film that suppresses cracking and whitening during bending. When a nucleating agent is simply added, the particle size increases due to secondary aggregation of the nucleating agent in the resin. On the other hand, when nucleating agent vesicles are added, the dispersibility in the resin improves, resulting in a significant increase in the number of crystal nuclei relative to the amount of nucleating agent added, compared to simply adding the nucleating agent. Therefore, the average particle size of spherulites in the crystalline portion of the resin becomes smaller, which suppresses cracking and whitening during bending. Thus, by adding nucleating agent vesicles, the degree of crystallinity can be further increased, making it possible to achieve both improved elastic modulus and better processability.

[0044] The transparent skin layer 21 is formed from, for example, a resin material to which a nucleating agent is added in an amount preferably between 0.05 parts by mass and 0.5 parts by mass, more preferably between 0.1 parts by mass and 0.3 parts by mass, per 100 parts by mass of polypropylene resin as the main component. When using nucleating agent vesicles, the amount of nucleating agent added to the resin material is the amount added in terms of the nucleating agent contained in the nucleating agent vesicles. If the amount of nucleating agent added is less than 0.05 parts by mass, the crystallinity of the polypropylene may not improve sufficiently, and the scratch resistance of the transparent skin layer 21 may not improve sufficiently. Furthermore, if the amount of nucleating agent added exceeds 0.5 parts by mass, the excess crystal nuclei may inhibit spherulite growth of polypropylene, resulting in insufficient improvement in the crystallinity of polypropylene and potentially insufficient improvement in the scratch resistance of the transparent skin layer 21. Here, "main component" refers to the resin material that accounts for 50% or more by mass of the resin material constituting the transparent skin layer 21.

[0045] (A method for nano-encapsulating nucleating agents) Furthermore, as methods for nano-sizing nucleating agents, appropriate methods such as solid-phase methods, which involve mainly mechanical grinding of the nucleating agent to obtain nano-sized particles; liquid-phase methods, which involve the synthesis or crystallization of nano-sized particles in a nucleating agent or a solution in which the nucleating agent is dissolved; and gas-phase methods, which involve the synthesis or crystallization of nano-sized particles from a nucleating agent or a gas or vapor composed of the nucleating agent, can be used as appropriate. Examples of solid-phase milling methods include ball mills, bead mills, rod mills, colloidal mills, conical mills, disc mills, hammer mills, and jet mills. Liquid-phase methods include, for example, crystallization, coprecipitation, sol-gel, liquid-phase reduction, and hydrothermal synthesis. Furthermore, gas-phase methods include, for example, electric furnace, chemical flame, laser, and thermal plasma.

[0046] (Supercritical reverse-phase evaporation method) As a method for nano-sizing nucleating agents, supercritical reverse-phase evaporation is preferred. Supercritical reverse-phase evaporation is a method for creating capsules (nano-sized vesicles) containing the target substance using carbon dioxide under supercritical conditions or temperature or pressure conditions above the critical point. Supercritical carbon dioxide refers to carbon dioxide in a supercritical state above the critical temperature (30.98°C) and critical pressure (7.3773±0.0030 MPa), while carbon dioxide under temperature or pressure conditions above the critical point refers to carbon dioxide under conditions where only the temperature or only the pressure exceeds the critical conditions. Furthermore, as a specific nano-processing method using supercritical reverse-phase evaporation, an aqueous phase is first injected into a mixed fluid of supercritical carbon dioxide, phospholipid as an outer membrane-forming material, and a nucleating agent as an encapsulating material, and the mixture is stirred to generate an emulsion of supercritical carbon dioxide and the aqueous phase.

[0047] Next, by reducing the pressure, carbon dioxide expands and evaporates, causing a phase inversion and generating nanocapsules (nanovesicles) in which phospholipids cover the surface of the nucleating agent particles with a single layer film. By using this supercritical reverse-phase evaporation method, unlike conventional encapsulation methods in which a multi-layer outer film forms on the surface of nucleating agent particles, single-layer capsules can be easily produced, thus enabling the preparation of smaller diameter capsules. Furthermore, nucleating agent vesicles are prepared by methods such as the Bangham method, extrusion method, hydration method, surfactant dialysis method, reverse-phase evaporation method, freeze-thaw method, and supercritical reverse-phase evaporation method. Among these methods, it is particularly preferable to prepare the nucleating agent vesicles using the supercritical reverse-phase evaporation method.

[0048] (The outer membrane that constitutes the nucleating agent vesicle) The outer membrane constituting the nucleating agent vesicle is composed of, for example, a single layer membrane. Furthermore, this outer membrane is composed of, for example, a substance containing biolipids such as phospholipids. In this specification, nucleating agent vesicles whose outer membrane is composed of a substance containing biolipids such as phospholipids are referred to as nucleating agent liposomes. Examples of phospholipids that make up the outer membrane include glycerophospholipids such as phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, phosphatidic acid, phosphatidylglycerol, phosphatidylinositol, cardiopine, egg yolk lecithin, hydrogenated egg yolk lecithin, soy lecithin, and hydrogenated soy lecithin, as well as sphingophospholipids such as sphingomyelin, ceramide phosphorylethanolamine, and ceramide phosphorylglycerol.

[0049] (Other materials that form the outer layer) Other substances that form the outer membrane of the vesicle include, for example, nonionic surfactants and dispersants such as mixtures of nonionic surfactants with cholesterol or triacylglycerols. Among these, one or more nonionic surfactants can be used, for example, polyglycerin ether, dialkylglycerin, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, polyoxyethylene sorbitan fatty acid ester, sorbitan fatty acid ester, polyoxyethylene polyoxypropylene copolymer, polybutadiene-polyoxyethylene copolymer, polybutadiene-poly(2-vinylpyridine), polystyrene-polyacrylic acid copolymer, polyethylene oxide-polyethylethylene copolymer, polyoxyethylene-polycaprolactam copolymer, etc. As cholesterols, for example, cholesterol, α-cholestanol, β-cholestanol, cholestan, desmosterol (5,24-cholestadiene-3β-ol), sodium cholate, or cholecalciferol can be used. Furthermore, the outer membrane of liposomes may be formed from a mixture of phospholipids and a dispersant.

[0050] In the decorative sheet 10 of this embodiment, it is preferable to use a radical scavenger liposome having an outer membrane made of phospholipid as the nucleating agent vesicle. By composing the outer membrane from phospholipid, the compatibility between the resin material, which is the main component of the decorative sheet 10, and the vesicle can be improved. The nucleating agent is not particularly limited as long as it is a substance that acts as a starting point for crystallization when the resin crystallizes. Examples of nucleating agents include metal phosphate salts, metal benzoate salts, metal pimephosphate salts, metal rosin salts, benzylidene sorbitol, quinacridone, cyanine blue, and talc. In particular, to maximize the effect of the nano-processing, it is preferable to use metal phosphate salts, metal benzoate salts, metal pimephosphate salts, and metal rosin salts, which are non-melting types and can be expected to have good transparency. However, if the transparency of the material itself can be achieved by the nano-processing, colored quinacridone, cyanine blue, and talc can also be used. In addition, molten benzylidene sorbitol may be appropriately mixed with the non-melting nucleating agent.

[0051] (Characteristics of the transparent skin layer 21) As described above, the decorative sheet 10 of this embodiment 1 is characterized in that the transparent skin layer 21 contains a resin material and a nucleating agent. Furthermore, the decorative sheet 10 of this embodiment 1 is characterized in that, when forming the transparent skin layer 21, a nucleating agent encapsulated in vesicles is added to the resin material to crystallize the resin material. By adding the nucleating agent to the resin composition while it is encapsulated in vesicles, the dispersibility of the nucleating agent in the resin material, i.e., in the transparent skin layer 21, is dramatically improved. On the other hand, it is conceivable that directly identifying the nucleating agent encapsulated in vesicles based on the structure and properties of the finished decorative sheet 10 may be difficult depending on the circumstances, and therefore impractical. The reasons for this are as follows.

[0052] The nucleating agent added in vesicle form exhibits high dispersibility and is dispersed even in the laminated state, which is a precursor to the fabricated decorative sheet 10, and remains highly dispersed in the transparent skin layer 21. However, in the manufacturing process of the decorative sheet 10, the laminate is usually subjected to various treatments such as compression and hardening, and such treatments may cause the outer membrane of the vesicles containing the nucleating agent to be fractured or undergo a chemical reaction. Therefore, depending on the processing steps of the decorative sheet 10, the state of the outer membrane of the nucleating agent in the finished decorative sheet 10 may vary, and there is a high possibility that the nucleating agent is not contained (covered) by the outer membrane.

[0053] Furthermore, if the nucleating agent is not contained within the outer membrane, it becomes difficult to specify the physical properties of the nucleating agent within a numerical range. It is also conceivable that it may be difficult to determine whether the constituent materials of the fragmented outer membrane are the outer membrane of the vesicle or materials added separately from the nucleating agent. Thus, although this disclosure differs from conventional methods in that the nucleating agent is formulated in a highly dispersed manner within the decorative sheet 10, it is conceivable that it may be impractical to determine whether this is because the nucleating agent was added in the form of vesicles containing the nucleating agent, based on numerical ranges derived from the analysis of its structure and properties in the state of the decorative sheet 10.

[0054] (Method of manufacturing decorative sheet 10) The decorative sheet 10 has the above-described structure, and its manufacturing method comprises the following first to third steps and is manufactured in line. Here, "inline" means that because there is no lamination process to bond the films together, the printing process, which normally involves multiple steps, can be completed in a single line. In other words, the entire manufacturing process, from printing to applying the surface protective layer 60, can be carried out in a single inline process.

[0055] (1) First process The first step is to manufacture a transparent raw material 20, which is a single-layer film, by extruding a transparent core layer 22 made of a transparent polypropylene-based thermoplastic resin and transparent skin layers 21 located on the front and back sides of the transparent core layer 22, respectively, to which a dispersant as a nano-sized additive has been added to the thermoplastic resin.

[0056] (2) Second process The second step is to sequentially form a printed pattern layer 50, a colored layer 40, and a primer layer 30 on the back side of the transparent raw material 20 manufactured in the first step. Furthermore, the layers formed in the second step are not limited to the three layers of the printed pattern layer 50, the colored layer 40, and the primer layer 30. For example, there may be just one layer including at least the printed pattern layer 50, or two layers including the printed pattern layer 50 plus either the colored layer 40 or the primer layer 30, or even four or more layers.

[0057] (3) Third process The third step is to form a surface protective layer 60 on the surface side of the transparent raw material 20 manufactured in the first step, either after or before the second step. The above process can be performed in two possible orders: the first process, the second process, and the third process; or the first process, the third process, and the second process.

[0058] (Decorative tack sheet 11) As shown in Figure 1, the decorative tack sheet 11 is a decorative sheet 10 having the above-described configuration, with an adhesive layer 70 and a release paper 80 attached to the side of the primer layer 30.

[0059] (Decorative panel) Although not shown in the diagram, the decorative panel is made by using an adhesive or the like to bond a substrate to the primer layer 30 side of a decorative sheet 10 having the above-described structure. Alternatively, the decorative panel can also be made by peeling off the release paper 80 of the decorative tack sheet 11 shown in Figure 1 and directly bonding the substrate to the adhesive layer 70. Here, the substrate can be made of any type, such as wood, steel, or resin, but it may also be made of, for example, a non-combustible steel plate or a non-combustible material as specified in Ministry of Construction Notification No. 1400.

[0060] (Another embodiment of the layer structure on the back side of the transparent raw material 20) The layer structure on the back side of the transparent raw material 20 may be in the following form, although it is not shown in the diagram. (a) On the back side of the transparent base material 20, only the printed pattern layer 50 and the colored layer 40 may be formed in this order. (b) On the back side of the transparent base material 20, only the printed pattern layer 50, the colored layer 40, and the primer layer 30 may be formed in this order.

[0061] (Description of Embodiment 2 shown in Figure 2) Using Figure 2, we will describe the decorative sheet 10 according to another embodiment (hereinafter referred to as "Embodiment 2"). The first feature of Embodiment 2 is that, with respect to the embossed portion 90, the embossed portion 90 extends deeply from the surface protective layer 60 to the transparent base material 20. In other words, in Embodiment 1, the embossed portion 90 extends from the surface of the surface protective layer 60 toward the transparent base material 20 and reaches the topcoat layer 62. In contrast, as shown in Figure 2, in Embodiment 2, the embossed portion 90 extends from the surface of the surface protective layer 60 toward the transparent base material 20 and partially penetrates the transparent base material 20. The embossed portion 90 is formed before the resin of the transparent base material 20 hardens. This is because the hardness increases after the resin hardens. Compared to the embossed portion 90 of Embodiment 1, the embossed portion 90 extends to the transparent base material 20, resulting in a clearer and sharper outline of the recessed areas, further enhancing the three-dimensional design.

[0062] (Second characteristic feature of Embodiment 2) A second feature of Embodiment 2 is that, as shown in Figure 2, a sealer layer 100 is provided between the back side of the transparent base material 20 and the printed pattern layer 50 to improve the adhesion of the printed pattern layer 50. The material of the sealer layer 100 is, for example, urethane resin, acrylic resin, or vinyl chloride resin. Alternatively, the material of the sealer layer 100 may be a transparent ink obtained by removing colorants such as dyes or pigments from the ink used in the printed pattern layer 50. Furthermore, the sealer layer 100 is dispersed in a binder made of synthetic resin along with appropriate additives such as fillers, tackifiers, plasticizers, stabilizers, dispersants, defoamers, leveling agents, surfactants, and drying agents, as well as a solvent or diluent. Embodiment 2, having a sealer layer 100, can improve the printability of the transparent base material 20 and its adhesion to the printed pattern layer 50. Other aspects of this embodiment 2 are denoted by the same reference numerals as those used in embodiment 1 of Figure 1, and their descriptions are omitted.

[0063] (Description of Embodiment 3 shown in Figure 3) Using Figure 3, we will describe the decorative sheet 10 according to another embodiment (hereinafter referred to as "Embodiment 3"). The characteristic of Embodiment 3 is that the transparent raw material 20 is formed as a single layer. In other words, the decorative sheet 10 according to Embodiment 1 in Figure 1 is composed of two types and three layers of transparent raw material 20. In contrast, the transparent raw material 20 of Embodiment 3 is composed of a single layer, as shown in Figure 3. Transparent raw material 20 is characterized by the addition of a dispersant as a nano-sized additive. Compared to the multi-layered transparent raw material 20 of Embodiment 1, the transparent raw material 20 is a single layer, making it easy to thin, and furthermore, by using nano-sized additives, the sheet can be made rigid even when it is a thin film. Other aspects of this third embodiment are denoted by the same reference numerals as those used in the first embodiment of Figure 1, and their descriptions are omitted.

[0064] (Method for manufacturing the decorative sheet 10 of this embodiment 3) The manufacturing method for the decorative sheet 10 of this third embodiment will be described below. The manufacturing method of this third embodiment, like that of the first embodiment described earlier, has a first to third step and is manufactured in line. The first step is to manufacture a transparent base material by extruding a transparent polyolefin-based thermoplastic resin with a nano-sized dispersant additive. The second step is to form a printed pattern layer on the back side of the transparent base material manufactured in the first step. The third step is to form a surface protective layer on the front side of the transparent base material after or before the second step.

[0065] (Description of Embodiment 4 shown in Figure 4) Using Figure 4, we will describe the decorative sheet 10 according to another embodiment (hereinafter referred to as "Embodiment 4"). Embodiment 4 combines the two feature points of Embodiment 2 and the one feature point of Embodiment 3. Other aspects of this embodiment 4 are denoted by the same reference numerals as those used in Embodiment 1 in Figure 1, Embodiment 2 in Figure 2, and Embodiment 3 in Figure 3, and their descriptions are omitted. [Examples]

[0066] Examples 1 to 3 of the decorative sheet according to the present invention, as well as Comparative Example 1, are described below. However, the present invention is not limited to the following Examples 1 to 3.

[0067] (Example 1) In Example 1, a single-layer decorative sheet 10 was manufactured using the following materials and procedure. Firstly, a blend of polypropylene resin and a weather-resistant agent is used for the transparent core layer 22 of the transparent raw material 20. For the transparent skin layer 21, a transparent polypropylene resin with a dispersant and other nano-sized additives is used. The transparent skin layer 21:transparent core layer 22:transparent skin layer 21 is simultaneously extruded in a thickness ratio of 0.5:9:0.5, and the transparent raw material 20 is manufactured with a thickness of 130 μm. Secondly, a pattern was printed on the back side of the transparent base material 20 using a urethane resin by gravure printing to create a printed pattern layer 50, and then a colored layer 40 was applied using a two-component urethane resin. Thirdly, the gravure printing method results in a solid content of 1 g / m². 2 To achieve this, a urethane-based resin was applied to form a primer layer 30.

[0068] Fourthly, after applying an antiviral treatment, a low-gloss acrylic two-component curing resin (acrylic urethane resin manufactured by DIC Graphics Co., Ltd.) is applied to a thickness of 6 μm to form a base coat layer 61 as a surface protective layer 60. On top of this, a top coat layer 62 is formed by printing a pattern that matches the printed pattern layer 50 using the same resin but with a higher gloss. Furthermore, the surface protective layer 60 is treated with an antiviral agent. Fifthly, a decorative sheet 10 was applied to a 3 mm thick MDF board using a water-based urethane adhesive, bonded together, and pressed using a press machine at 30-50°C to create a decorative panel, which was used as the evaluation sheet for Example 1.

[0069] (Example 2) Example 2 was identical to Example 1 except that the thickness of the transparent raw material 20 was reduced from 130 μm to 50 μm, and an evaluation sheet was created for Example 2.

[0070] (Example 3) For the transparent raw material 20, a blend of polypropylene resin and a weather-resistant agent was used. The transparent polypropylene resin, to which a dispersant as a nano-sized additive was added, was extruded and molded to a thickness of 100 μm, thus producing the transparent raw material 20 of Example 3.

[0071] (Comparative Example 1) Comparative Example 1 differs from Examples 1 and 2 primarily in that it does not contain nano-sized additives such as dispersants in the transparent raw material 20. Comparative Example 1, although not shown in the diagram, involved preparing a decorative sheet 10 using the following materials and procedure. Firstly, a 55μ thick pigment-containing colored polyethylene sheet (manufactured by Riken Technos) was used as the transparent base material, and a patterned print layer was formed using urethane ink (Laminar, manufactured by Toyo Ink Manufacturing Co., Ltd.) via gravure printing. Secondly, a 70 μm thick transparent PP layer of homopolypropylene resin (manufactured by Prime Polymer Co., Ltd.) was extruded and laminated onto the patterned printing layer. Furthermore, a 6 μm thick layer of the same acrylic two-component curing resin (acrylic urethane resin manufactured by DIC Graphic Co., Ltd.) as in Example 1 was applied as surface protection, and a primer layer similar to that in Example 1 was applied to the back surface of the colored base material layer to create a decorative sheet. Thirdly, a 3mm thick MDF board was coated with a water-based urethane adhesive on the back of the decorative sheet, bonded together, and pressed using a press machine at 30-50°C to create a decorative panel, which was used as the evaluation sheet for Comparative Example 1.

[0072] (Evaluation methods and evaluation criteria) The evaluation method for the evaluation sheet created as described above is as follows: (1) Scratch test (2) Scratch hardness test (pencil hardness)

[0073] (Scratch test) For the scratch test, a coin scratch test was performed on each evaluation sheet, and the load at which no continuous scratches appeared on the surface of the evaluation sheet was measured. In the scratch test, a 10-yen coin was placed on the surface of the evaluation sheet, and the test was started with a load of 1 kg, gradually increasing the load by 1 kg increments until it reached 4 kg.

[0074] (Scratch hardness test) For the scratch hardness test, the hardness (pencil hardness) of the hardest pencil that did not leave a scratch on the surface of each evaluation sheet was measured using the scratch hardness (pencil method) test specified in JIS K5600-5-4:1999.

[0075] (Evaluation Criteria) In the scratch test, a load of "1 kg" or more was considered a pass, while anything else was considered a fail. In the scratch hardness test, pencils with a hardness (pencil hardness) of "2B" or higher were considered to pass, while anything else was considered to fail.

[0076] (Evaluation results) The evaluation results from the evaluation sheet are as shown in Table 1 below.

[0077] [Table 1]

[0078] (Examples 1-3 and Comparative Example 1) Of the four evaluation sheets for Examples 1-3 and Comparative Example 1, only three evaluation sheets for Examples 1-3 were marked as "passing." The remaining evaluation sheet for Comparative Example 1 showed that the pencil hardness (pencil hardness scale) was "4B," which was marked as "Fail."

[0079] It can be inferred that the reason for the poor performance in Comparative Example 1 is that no nano-sized additives such as dispersants were added to the transparent raw material 20. Furthermore, it can be inferred that the difference observed in the scratch test and scratch hardness test in Examples 1 to 3 is due to the thickness of the evaluation sheet. In other words, the evaluation sheets in Examples 1 and 3 were thicker than those in Example 2, and it can be inferred that a thicker sheet is advantageous in the scratch test and scratch hardness test. Furthermore, the thickness of the transparent raw material 20 in Example 3 is "100 μm," which is thinner than the "130 μm" in Example 1. Despite the thinner thickness of the transparent raw material 20 in Example 3, the same evaluation results as in Example 1 were obtained. [Explanation of Symbols]

[0080] 10 decorative sheets 11 Decorative Tack Sheet 20 Transparent original fabric 21 Transparent Skin Layer 22 Transparent core layer 30 Primer layer 40 colored layer 50 Printed Image Layers 60 Surface protective layer 61 Undercoat layer 62 Top coat layer 70 Adhesive layer 80 Release paper 90 Embossed part 100 sealer layer

Claims

1. A printed pattern layer is formed on the back side of a transparent base material made of transparent olefin sheets, with a pattern printed on it. A surface protective layer is formed on the surface side of the transparent raw material. A decorative sheet having no laminate layer made of another film on either the front or back side of the transparent base material, The transparent raw material is to which a dispersant is added as an additive. The aforementioned dispersant as an additive includes a nucleating agent vesicle in which a nucleating agent is encapsulated within the vesicle. The average particle size of the nucleating agent is half of the visible light wavelength range of 400 nm to 750 nm. The aforementioned transparent raw material is a two-type, three-layer structure in which a transparent skin layer, a transparent core layer, and another transparent skin layer are laminated in that order. The decorative sheet is characterized in that the dispersant is added to the transparent skin layer.

2. The decorative sheet according to claim 1, characterized in that the printed pattern layer and the opacity layer are formed in order on the back side of the transparent raw material.

3. The decorative sheet according to claim 1 or 2, characterized in that a plurality of layers are formed on the back side of the transparent raw material, and a primer layer is formed at the position furthest from the transparent raw material among the plurality of layers.

4. On the back side of the transparent raw material, which is made of transparent olefin sheet, only a printed pattern layer and an opaque layer are formed in this order. The decorative sheet has only a surface protective layer formed on the surface side of the aforementioned transparent raw material. The transparent raw material is to which a dispersant is added as an additive. The aforementioned dispersant as an additive includes a nucleating agent vesicle in which a nucleating agent is encapsulated within the vesicle. The average particle size of the nucleating agent is half of the visible light wavelength range of 400 nm to 750 nm. The aforementioned transparent raw material is a two-type, three-layer structure in which a transparent skin layer, a transparent core layer, and another transparent skin layer are laminated in that order. The decorative sheet is characterized in that the dispersant is added to the transparent skin layer.

5. On the back side of the transparent raw material, which is made of transparent olefin sheet, only a printed pattern layer, an opacity layer, and a primer layer are formed in this order. The decorative sheet has only a surface protective layer formed on the surface side of the aforementioned transparent raw material. The transparent raw material is to which a dispersant is added as an additive. The aforementioned dispersant as an additive includes a nucleating agent vesicle in which a nucleating agent is encapsulated within the vesicle. The average particle size of the nucleating agent is half of the visible light wavelength range of 400 nm to 750 nm. The aforementioned transparent raw material is a two-type, three-layer structure in which a transparent skin layer, a transparent core layer, and another transparent skin layer are laminated in that order. The decorative sheet is characterized in that the dispersant is added to the transparent skin layer.

6. The decorative sheet according to any one of claims 1 to 3, characterized in that a sealer layer is provided between the back side of the transparent base material and the printed pattern layer to improve adhesion with the printed pattern layer.

7. The decorative sheet according to any one of claims 1 to 6, characterized in that an inorganic filler is added to the transparent skin layer.

8. The decorative sheet according to any one of claims 1 to 7, characterized in that an embossed portion synchronized with the pattern is formed on the surface side of the surface protective layer.

9. The decorative sheet according to claim 8, characterized in that the embossed portion extends from the surface side of the surface protective layer toward the transparent base material, and a portion of it penetrates the transparent base material.

10. The decorative sheet according to any one of claims 1 to 9, characterized in that the printed pattern layer is a single color.

11. A decorative tack sheet using the decorative sheet according to claim 3 or 5, characterized in that the side of the primer layer of the decorative sheet has an adhesive layer and a release paper.

12. A decorative panel using the decorative sheet according to claim 3 or 5, characterized in that a substrate is bonded to the side of the primer layer of the decorative sheet.

13. A first step in manufacturing a transparent raw material by extruding a transparent core layer made of a transparent polypropylene-based thermoplastic resin and transparent skin layers located on the front and back sides of the transparent core layer, respectively, wherein a dispersant is added as an additive to the thermoplastic resin, and the two layers are extruded together. A second step involves forming a printed pattern layer on the back side of the transparent raw material manufactured in the first step, The process includes a third step of forming a surface protective layer on the surface side of the transparent raw material, either after or before the second step, In the first step, the dispersant as an additive includes a nucleating agent vesicle in which a nucleating agent is encapsulated within the vesicle. The average particle size of the nucleating agent is half of the visible light wavelength range of 400 nm to 750 nm. A method for manufacturing decorative sheets, characterized by in-line production.

14. The method for manufacturing a decorative sheet according to claim 13, characterized in that, in the second step, the printed pattern layer and the concealing layer are formed in this order on the back side of the transparent raw material.

15. The method for manufacturing a decorative sheet according to claim 13 or claim 14, characterized in that, in the second step, a primer layer is formed on the back side of the transparent raw material, on the side furthest from the printed pattern layer.

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