Decorative sheet, decorative material, and production method of decorative sheet

Abstract

To provide a decorative sheet for reducing the number of manufacturing steps, having concealing property, and capable of suppressing influence given to an environment, a decorative material, and a production method of the decorative sheet.SOLUTION: A decorative sheet 10 includes: a transparent raw fabric 20 constituted by a transparent olefin sheet; a printed pattern layer 50 and a colored layer 40 sequentially formed on one side face of the transparent raw fabric 20; and a surface protective layer 60 formed on the other side face of the transparent raw fabric 20, where a dispersant as a nano-sized additive agent is added to the transparent raw fabric 20, any of both faces of the transparent raw fabric 20 has no laminate layer composed of another film, a color difference between when existing on a needle-leaved tree plywood and when existing on a broad-leaved tree plywood is 2.0 or lower, and the printed pattern layer 50 is formed using a water-color ink.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a decorative sheet, a decorative material, and a method for producing a decorative sheet. [Background technology]

[0002] Conventionally, decorative sheets used indoors have been applied to the surfaces of fittings such as interior doors and entrance storage, fittings such as trims, moldings, baseboards, window frames, door frames, and flooring materials. In recent years, decorative sheets used for these fittings, fittings, flooring materials, and the like are mainly made of olefin-based materials due to the problem of gases during combustion (see, for example, Patent Documents 1 to 3). Also, in order to protect the pattern from wear on the surface of the decorative sheet, a multi-layered decorative sheet is widely used in which a pattern is printed on a colored olefin sheet and a transparent olefin sheet is laminated on top of this (see, for example, Patent Documents 2 and 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-110929 A [Patent Document 2] JP 2015-199313 A [Patent Document 3] JP 2016-101663 A Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned conventional manufacturing of decorative sheets has a problem that a printing process and a lamination process are required. As a method for solving this problem, a method is considered in which the decorative sheet is made into a single-layer film printed on the back side of a transparent olefin sheet, thereby eliminating the lamination process and reducing the number of manufacturing steps from printing to providing a surface protective layer. However, when it is made into a single-layer film, the concealment property of the decorative sheet becomes an issue. In other words, the color of the surface of the decorative material substrate to which the decorative sheet is attached does not necessarily match the desired design, and the surface of the decorative material substrate may have defects such as color unevenness, knots, cracks, and seams. Therefore, it is necessary to sufficiently conceal these so that they do not show through the pattern of the decorative sheet from the surface.

[0005] Furthermore, conventionally, organic solvent inks have been used as inks for producing decorative sheets, which can cause various problems such as reduced workability in printing plants, air pollution, generation of residual solvents, etc. For this reason, a decorative sheet that can reduce the impact on the environment has been desired. The present invention has been made in light of the above-mentioned points, and aims to provide a decorative sheet, a decorative material, and a method for manufacturing a decorative sheet that can reduce the number of manufacturing steps, have sufficient hiding power, and minimize the impact on the environment. [Means for solving the problem]

[0006] A decorative sheet according to one embodiment of the present invention comprises a transparent base roll made of a transparent olefin sheet, a printed pattern layer and a colored layer formed in that order on one side of the transparent base roll, and a surface protective layer formed on the other side of the transparent base roll, wherein a dispersant as a nano-sized additive is added to the transparent base roll, and the decorative sheet does not have a laminate layer made of another film on either side of the transparent base roll, and is characterized in that the color difference between when the sheet is placed on softwood plywood and when it is placed on hardwood plywood is 2.0 or less, and the printed pattern layer is formed using water-based ink.

[0007] In addition, a decorative material according to another aspect of the present invention is characterized by comprising the decorative sheet of the above aspect and a substrate adhered to the side of the decorative sheet opposite the surface protective layer. Furthermore, a manufacturing method for decorative sheets according to another embodiment of the present invention includes the steps of manufacturing a transparent base sheet in which a dispersant as a nano-sized additive is added to a transparent polyolefin-based thermoplastic resin, forming a printed pattern layer on one side of the transparent base sheet using an aqueous ink, forming a colored layer on the printed pattern layer, and forming a surface protective layer on the other side of the transparent base sheet, and is characterized in that the manufacturing is carried out in-line and that the color difference between when the sheet is placed on a softwood plywood and when it is placed on a hardwood plywood is 2.0 or less. Effect of the Invention

[0008] According to one aspect of the present invention, it is possible to provide a decorative sheet, a decorative material, and a method for manufacturing a decorative sheet that can reduce the number of manufacturing steps, have concealing properties, and reduce the impact on the environment. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view showing a schematic example of a decorative sheet according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a process diagram illustrating an example of a method for producing a decorative sheet. [Diagram 3] FIG. 1 is a cross-sectional view showing a schematic example of a decorative material according to one embodiment of the present invention. [Figure 4] FIG. 11 is a cross-sectional view showing a schematic diagram of a modified example of a decorative sheet according to one embodiment of the present invention. [Diagram 5] FIG. 11 is a cross-sectional view showing a schematic diagram of a modified example of a decorative sheet according to one embodiment of the present invention. [Figure 6] FIG. 11 is a cross-sectional view showing a schematic diagram of a modified example of a decorative sheet according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Embodiment 1) Next, one 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 thickness and planar dimensions, the thickness ratio of each layer, etc. differ from the actual ones. Furthermore, 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 described below. The technical idea of ​​the present invention can be modified in various ways within the technical scope defined by the claims.

[0011] Fig. 1 is a cross-sectional view showing a schematic diagram of a decorative sheet according to embodiment 1. In Fig. 1, 10 is a decorative sheet, which, although not shown, is used indoors, for example, and is attached to the surfaces of fittings (interior doors, entrance storage) and fixtures (trimmings, moldings, baseboards, window frames, door frames), etc., and is used by matching the patterns of fittings and fixtures for each house or room. The decorative sheet 10 includes the following layers, which are provided in the order starting from (1).

[0012] The following items (1) to (5) will be discussed later. (1) Primer layer 30 (2) Colored layer 40 (3) Printed image layer 50 (4) Transparent original fabric 20 (5) Surface protective layer 60 The decorative sheet 10 having such a configuration has a color difference ΔE between when it is placed on softwood MDF (Medium Density Fiberboard) (softwood plywood) and when it is placed on hardwood MDF (hardwood plywood), which satisfies ΔE≦2.0. Furthermore, the decorative sheet 10 has a line roughness (arithmetic mean roughness) Ra of the surface opposite to the surface protective layer 60 that satisfies Ra=0.4 μm or more and 1.2 μm or less. The color difference ΔE here is a value expressed by the following formula (1).

[0013] ΔE*ab=〔(ΔL*) 2 +(Δa*) 2 +(Δb*) 2 〕 1 / 2 …(1) In addition, the color difference ΔE*ab in formula (1) is when the L*a*b* color system is used, and may differ depending on the color system used for evaluation. Here, L* is lightness, a* and b* are values ​​indicating hue, ΔL* is the difference in L* between two colors, and Δa* and Δb* are the differences in a* and b* between two colors, respectively.

[0014] Moreover, the printed pattern layer 50 has a pattern printed thereon using water-based ink. The layers of the decorative sheet 10 are not limited to the above (1) to (5), and for example, as shown in Fig. 1, a (6) adhesive layer 70 and (7) release paper 80 may be added to the primer layer 30 side to form a decorative tack sheet 11. As shown in Fig. 1, the decorative sheet 10 may have an embossed portion 90 formed on the surface side of the surface protection layer 60 in harmony with the pattern of the printed pattern layer 50, or, although not shown, a substrate may be adhered to the surface of the primer layer 30 opposite the colored layer 40 to form a decorative material.

[0015] Moreover, the above "(1) primer layer 30" may be omitted. That is, if the above "(2) colored layer 40" has a function as a primer layer, the primer layer 30 can be omitted. In addition, as shown in Figure 4 described later, a sealer layer 100 may be provided between the printed pattern layer 50 and the transparent base material 20 for the purpose of improving the printability of the transparent base material 20 and its adhesion to the printed pattern layer 50.

[0016] (Main features of decorative sheet 10) The main features of the decorative sheet 10 according to the first embodiment are as follows.

[0017] (1) As shown in FIG. 1, the decorative sheet 10 is a decorative sheet in which a printed pattern layer 50, a colored layer 40, and a primer layer 30 are formed in that order from the transparent original roll 20 side on the back side (the bottom side in FIG. 1) of the transparent original roll 20, which is a single-layer film composed of a transparent olefin sheet, and a surface protective layer 60 is formed on the front side of the transparent original roll 20, and which does not have a laminate layer made of another film on either the front or back side of the transparent original roll 20. The transparent raw sheet 20 contains a dispersant as a nano-sized additive. The decorative sheet 10 of embodiment 1 does not require a lamination process of other sheets during production, which reduces the number of manufacturing steps and allows the manufacturing process from printing to applying the surface protective layer 60 to be carried out in a single in-line process. Furthermore, the decorative sheet 10 according to the first embodiment can be provided with a gloss / matte coating on the surface protective layer 60, if necessary, to match the pattern.

[0018] Furthermore, because conventional decorative sheets are multilayered, there are limitations to how thin the sheet can be made in terms of film formation, and there is also the problem that the sheet cannot be made hard enough. However, the decorative sheet 10 of embodiment 1 is a single layer, so it is easy to make it thin, and furthermore, by using nano-sized additives, the sheet can be made hard even when thin.

[0019] (2) The decorative sheet 10 according to embodiment 1 contains inorganic filler in addition to a dispersant as a nano-sized additive. Therefore, the film can be made thinner and the scratch resistance can be improved.

[0020] (3) In the decorative sheet 10 according to the first embodiment, the printed pattern layer 50 is formed using water-based ink. Therefore, compared to the case where organic solvent-based ink is used, it is possible to improve the workability in the printing factory, and to solve problems such as air pollution and generation of residual solvent, thereby suppressing the impact on the environment and improving safety.

[0021] (4) The decorative sheet 10 according to embodiment 1 is formed so that the color difference ΔE between when it is placed on a softwood MDF and when it is placed on a hardwood MDF satisfies ΔE≦2.0. Here, softwood MDF and hardwood MDF are widely used as the base material of the decorative sheet 10. Softwood MDF is relatively light in color, and hardwood MDF is relatively dark in color. The color difference ΔE between the decorative sheet 10 on the softwood MDF and the hardwood MDF is ΔE≦2.0. In other words, if the color difference between the decorative sheet 10 on the softwood MDF and the hardwood MDF is relatively small, the decorative sheet 10 can sufficiently exhibit hiding power for the softwood MDF, which is relatively light in color, and the hardwood MDF, which is relatively dark in color. In other words, the decorative sheet 10 can exhibit hiding power in a general use environment of the decorative sheet 10, that is, the decorative sheet 10 is used by adhering it to a base material made of softwood MDF or hardwood MDF, and can also exhibit hiding power for MDF, which is relatively light in color or color, and can exhibit hiding power in a wide variety of use environments.

[0022] Possible methods for making the color difference ΔE between when the decorative sheet 10 is placed on softwood MDF and when it is placed on hardwood MDF satisfy ΔE≦2.0 include increasing the amount of colored layer 40 applied to make it thicker, increasing the amount of inorganic filler such as titanium oxide added to the colored layer 40 to make the color of the colored layer 40 darker, adding pigments or the like to other layers, not limited to the colored layer 40, such as the primer layer 30 provided on the opposite side of the printed pattern layer 50 from the transparent base material 20, and further darkening the color of the printed pattern layer 50.

[0023] (5) The decorative sheet 10 according to embodiment 1 has a line roughness Ra of the surface opposite the surface protective layer 60, i.e., the line roughness Ra of the surface of the primer layer 30 opposite the colored layer 40, which satisfies Ra = 0.4 μm or more and 1.2 μm or less. In other words, since a certain degree of roughness is provided on the surface of the decorative sheet 10 that adheres to the substrate, the adhesiveness to the substrate can be improved by the anchoring effect.

[0024] Here, as described above, if the colored layer 40 is made thicker or the amount of additives added to the colored layer 40 is increased in order to provide the decorative sheet 10 with hiding properties, the hiding properties can be provided, but the adhesion to the substrate decreases. In the decorative sheet 10 according to the first embodiment, the hiding properties are improved by defining the range of the color difference ΔE between when the sheet is on a softwood MDF and when it is on a hardwood MDF, and the adhesion to the substrate is improved by defining the line roughness of the surface of the decorative sheet 10 opposite to the surface protection layer 60 (the primer layer 30 in the case of FIG. 1). Therefore, the hiding properties can be improved without decreasing the adhesion.

[0025] Possible methods for ensuring that the line roughness Ra satisfies Ra = 0.4 μm or more and 1.2 μm or less include adjusting the particle size of the silica added to the layer constituting the side of the decorative sheet 10 opposite the surface protective layer 60, such as the primer layer 30 in the case of Figure 1, adjusting the amount of silica added, and adjusting the roughness of the side opposite the surface protective layer when manufacturing the transparent base roll.

[0026] (6) The decorative sheet 10 according to the first embodiment has embossed portions 90 formed in harmony with the design of the printed design layer 50 . Here, when the decorative sheet is a multi-layered sheet, it is difficult to achieve a harmonious expression between the printed pattern layer 50 and the surface protective layer 60 on the surface of the laminate film. In contrast, the decorative sheet 10 according to embodiment 1 can easily achieve harmonious expression by providing the pattern printing and embossed portion 90 in-line on the front and back sides of the transparent raw material roll 20, which is a transparent olefin sheet.

[0027] (7) According to the decorative sheet 10 of the first embodiment, firstly, if the frame material is made of a single color, it is possible to deal with any pattern of the door part in advance, so that the pattern of the door part can be decided later, and when changing the pattern of the door part due to deterioration, it is possible to change only the door part without breaking and replacing the frame material. Of course, the door part itself can also be made of a single color. In addition, according to the decorative sheet 10 of the first embodiment, there is an advantage in using a single-color sheet, because it is easy to increase the lot size, increase productivity, and reduce the unit price by unifying all the rooms in an apartment or the like with a single color.

[0028] Furthermore, with the decorative sheet 10 of embodiment 1, even if a wood grain pattern is desired after a white finish, the decorative sheet 10 is thin but hard, so it is possible to change to a wood grain pattern later. For example, if the surface of a decorative board that has been finished in white is later desired to have a wood grain look, it is possible to change it to a wood grain look by attaching the decorative tack sheet 11 of embodiment 1 on top.

[0029] (8) The decorative material according to embodiment 1 has a substrate adhered to the primer layer 30 side, and therefore can be easily and quickly used as a decorative material.

[0030] (9) By using the method for producing the decorative sheet 10 according to the first embodiment, a highly functional decorative sheet 10 can be produced simply and quickly.

[0031] (Composition of each layer) (Transparent original fabric 20) The transparent raw material 20 serves as a support for the decorative sheet 10, and is formed of a single layer of transparent polypropylene as shown in FIG. 1, and may be composed of a single layer film (transparent layer) made of, for example, a transparent olefin sheet.

[0032] In addition, a dispersant and a weathering agent are added as nano-sized additives to the transparent raw roll 20. The transparent raw roll 20 formed of a single layer of transparent polypropylene is easy to thin, and the use of nano-sized additives makes it possible to harden the sheet even in a thin film. The transparent base material 20 is formed, for example, from a resin material having polypropylene resin as the main component and a nucleating agent added in an amount preferably in the range of 0.05 parts by mass or more and 0.5 parts by mass or less, and more preferably 0.1 parts by mass or more and 0.3 parts by mass or less, per 100 parts by mass.

[0033] When nucleating agent vesicles are used, the amount of nucleating agent added to the resin material is the amount added converted into the nucleating agent in the nucleating agent vesicles. If the amount of the nucleating agent added is less than 0.05 parts by mass, the crystallinity of the polypropylene may not be improved sufficiently, and the scratch resistance of the transparent raw sheet 20 may not be improved sufficiently. Furthermore, if the amount of nucleating agent added exceeds 0.5 parts by mass, the spherulite growth of the polypropylene will be inhibited due to an excess of crystal nuclei, and as a result, the crystallinity of the polypropylene will not be sufficiently improved, and the scratch resistance of the transparent raw sheet 20 may not be sufficiently improved.

[0034] Here, the term “main component” refers to a resin material that occupies 50% or more by mass of the resin material that constitutes the transparent roll 20 .

[0035] (Primer layer 30) As shown in FIG. 1, the primer layer 30 is located on the opposite side of the colored layer 40 from the printed design layer 50, and is provided mainly for the purpose of improving adhesion.

[0036] The functions of the primer layer 30 include improving adhesion, as well as stabilizing the surface after surface treatment, preventing corrosion of the metal surface, imparting adhesion, and preventing deterioration of the adhesive. The primer layer 30 is formed by, for example, gravure printing, with a solid content of 1 g / m 2 The urethane resin is applied to the surface so as to form the void. For example, urethane-based, acrylic-based, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, polyester-based, etc., can be used for the primer layer 30. In particular, a two-component curing urethane-based primer agent made by blending polyester polyol and polyisocyanate is preferable. In addition, if inorganic powder such as silica, barium sulfate, calcium carbonate, etc. is added to these materials to form the primer layer 30, it is effective in improving adhesive strength due to the anchoring effect.

[0037] (Colored layer 40) As shown in FIG. 1, the colored layer 40 is located on the surface of the printed pattern layer 50 opposite the transparent original roll 20, and is formed by a printing method. It is a concealing layer that is provided mainly for the purpose of imparting concealment. The colored layer 40 is printed, for example, by a gravure printing method using a two-liquid urethane resin in which a white pigment of titanium oxide is mixed with a urethane resin. The colored layer 40 contains 40% or more of an inorganic filler. The colored layer 40 may be a solid layer. The colored layer 40 may be transparent or translucent. By making the colored layer 40 transparent or translucent, the texture or pattern of the surface of the adherend of the decorative sheet 10 can be reflected on the surface side of the decorative sheet 10 through the colored layer 40.

[0038] (Printed image layer 50) As shown in Figure 1, the printed pattern layer 50 is located on the opposite side of the transparent base roll 20 from the surface protective layer 60, and is formed using a printing method for the purpose of imparting design features to the decorative sheet 10. The printed design layer 50 is formed by printing a design with a water-based resin by, for example, gravure printing.

[0039] As an example of the printing method, a gravure printing method has been given, but this is not limited thereto, and various printing methods such as an offset printing method, a letterpress printing method, a flexographic printing method, a screen printing method, an ink jet printing method, and an electrostatic printing method can be used.

[0040] The type of pattern of the printed pattern layer 50 may be any type depending on the purpose of use, the preferences of the user, etc., and common patterns include wood grain patterns, stone patterns, abstract patterns, etc. The types of patterns are not limited to the types exemplified above, and may be, for example, a full-surface solid print. The printing ink may contain appropriate additives such as fillers, tackifiers, plasticizers, stabilizers, dispersants, antifoaming agents, leveling agents, surfactants, and drying agents.

[0041] (Surface protective layer 60) The surface protective layer 60, also called a top coat, is located on the opposite side of the transparent base material 20 from the printed pattern layer 50 as shown in FIG. 1, and is formed by a printing method for the purpose of imparting surface properties such as abrasion resistance and water resistance.

[0042] As shown in FIG. 1, the surface protective layer 60 is composed of an undercoat layer 61 applied to the surface of the transparent roll 20 and a topcoat layer 62 applied to the surface of the undercoat layer 61, and the topcoat layer 62 has a lower gloss than the undercoat layer 61. The undercoat layer 61 is formed by applying an acrylic two-component curing resin (acrylic urethane resin manufactured by DIC Graphics Corporation) to a thickness of 6 μm.

[0043] The topcoat layer 62 is made of the same resin with a lower gloss and is printed with a pattern that matches the printed pattern layer 50. That is, by providing a gloss / matt coating on the surface protective layer 60, it is possible to make it match with the image. Furthermore, an embossed portion 90 that matches the design of the printed design layer 50 may be formed on the surface of the topcoat layer 62 .

[0044] Here, the embossed portion 90 gives the impression of having a certain difference in height, but the difference in height between the undercoat 61 and the topcoat layer 62 that is in harmony with the pattern is actually only on the order of a few μm, and this is the same as saying that the gloss / matte coat is applied to the surface protective layer 60 to make it match the pattern. Furthermore, the surface protective layer 60 is subjected to an antiviral treatment.

[0045] For the antiviral treatment, an antiviral agent is added to the surface protective layer 60. As the antiviral agent, for example, a silver-based inorganic additive (Biocide TB-B100) carrying silver ions manufactured by Taisho Technos Co., Ltd. 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 may be added only to the topcoat layer 62 located on the surface side of the surface protective layer 60.

[0046] Although an antiviral agent is added to the surface protective layer 60, the present invention is not limited to this. An antiviral agent may be applied to the surface side of the surface protective layer 60, at least to the surface of the topcoat layer 62.

[0047] (Nano-sized additives, etc. (nucleating agents)) The transparent raw sheet 20 contains an inorganic filler in addition to a dispersant as a nano-sized additive, and is hereinafter also referred to as a "nano-sized nucleating agent." The nano-sized nucleating agent is preferably used by being added to the polypropylene resin in the form of a nucleating agent vesicle, in which the nucleating agent is encapsulated in a vesicle having a single-layer outer membrane. In addition, in the decorative sheet 10 according to embodiment 1, the nucleating agent in the resin constituting the transparent raw sheet 20 may be encapsulated in vesicles with a portion of the nucleating agent exposed. Since the transparent raw sheet 20 contains a nucleating agent, the crystallization degree can be improved, and the scratch resistance (scratch resistance) of the decorative sheet 10 can be improved.

[0048] (Nano-sized nucleating agent particle size) It is preferable that the average particle size of the nano-sized nucleating agent is 1 / 2 or less of the wavelength range of visible light. Specifically, since the wavelength range of visible light is 400 nm or more and 750 nm or less, it is preferable that the average particle size is 375 nm or less.

[0049] Nano-sized nucleating agents have extremely small particle diameters, so the number of nucleating agents present per unit volume and the surface area increase inversely proportional to the cube of the particle diameter. As a result, the distance between each nucleating agent particle becomes closer, so that when crystal growth occurs from the surface of one nucleating agent particle added to the resin, the end from which the crystal is growing immediately comes into contact with the end of the crystal growing from the surface of another nucleating agent particle adjacent to the one nucleating agent particle, and the ends of the crystals inhibit each other's growth, stopping the growth of each crystal. Therefore, the average particle diameter of the spherulites in the crystalline part of the crystalline resin can be reduced, for example, the spherulite size can be reduced to 1 μm or less.

[0050] As a result, a resin film with a high degree of crystallinity and high hardness can be produced, and the stress concentration between spherulites that occurs during bending can be efficiently dispersed, thereby realizing 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 is improved, and the number of crystal nuclei per amount of nucleating agent added is significantly increased compared to when the nucleating agent is simply added.

[0051] This reduces the average particle size of the spherulites in the crystalline portion of the resin, suppressing the occurrence of cracks and whitening during bending. Therefore, by adding the nucleating agent vesicle, the degree of crystallization can be further increased, and it becomes possible to achieve both improved elastic modulus and processability.

[0052] (Method to nano-size nucleating agents) In addition, methods for nano-sizing a nucleating agent can be appropriately used, such as a solid-phase method in which the nucleating agent is primarily subjected to mechanical grinding to obtain nano-sized particles, a liquid-phase method in which nano-sized particles are synthesized or crystallized in a nucleating agent or a solution in which the nucleating agent is dissolved, and a gas-phase method in which nano-sized particles are synthesized or crystallized from a nucleating agent or a gas or vapor comprising the nucleating agent.

[0053] Examples of the solid phase method include a ball mill, a bead mill, a rod mill, a colloid mill, a conical mill, a disk mill, a hammer mill, and a jet mill. Examples of the liquid phase method include a crystallization method, a coprecipitation method, a sol-gel method, a liquid phase reduction method, a hydrothermal synthesis method, etc. Examples of the gas phase method include an electric furnace method, a chemical flame method, a laser method, a thermal plasma method, etc.

[0054] (Supercritical Reverse Phase Evaporation) The preferred method for nano-sizing a nucleating agent is supercritical reverse phase evaporation, which is a method for producing capsules (nano-sized vesicles) encapsulating a target substance using carbon dioxide in a supercritical state or under temperature or pressure conditions above the critical point.

[0055] Carbon dioxide in a supercritical state means carbon dioxide in a supercritical state at or above its critical temperature (30.98°C) and critical pressure (7.3773±0.0030MPa), and carbon dioxide under temperature or pressure conditions at or above its critical point means carbon dioxide under conditions where only the temperature or only the pressure exceeds the critical conditions. In addition, a specific nano-processing method using supercritical reverse phase evaporation involves first injecting an aqueous phase into a mixed fluid of supercritical carbon dioxide, phospholipids as an outer membrane-forming substance, and a nucleating agent as an encapsulating substance, and stirring the mixture to generate an emulsion of supercritical carbon dioxide and an aqueous phase.

[0056] Next, the pressure is reduced, causing the carbon dioxide to expand and evaporate, resulting in phase inversion, and the phospholipids form nanocapsules (nanovesicles) in which the surfaces of the nucleating agent particles are covered with a monolayer membrane. By using this supercritical reverse phase evaporation method, unlike conventional encapsulation methods in which the outer membrane on the surface of the nucleating agent particles is multi-layered, it is possible to easily produce capsules with a single layer, thereby making it possible to prepare capsules with a smaller diameter.

[0057] The nucleating agent vesicle is prepared, for example, by the Bangham method, the extrusion method, the hydration method, the surfactant dialysis method, the reverse phase evaporation method, the freeze-thaw method, the supercritical reverse phase evaporation method, etc. Among these, the nucleating agent vesicle is preferably prepared by using the supercritical reverse phase evaporation method.

[0058] (The outer membrane that constitutes the nucleating agent vesicle) The outer membrane constituting the nucleating agent vesicle is, for example, composed of a monolayer membrane. The outer membrane is also composed of a substance containing a biological lipid such as a phospholipid.

[0059] Nucleating vesicles whose outer membrane is composed of materials that include biological lipids, such as phospholipids, are referred to herein as nucleating liposomes. Examples of phospholipids constituting the outer membrane include glycerophospholipids such as phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, phosphatidic acid, phosphatidylglycerol, phosphatidylinositol, cardiopin, yolk egg lecithin, hydrogenated yolk egg lecithin, soybean lecithin, and hydrogenated soybean lecithin; and sphingophospholipids such as sphingomyelin, ceramide phosphorylethanolamine, and ceramide phosphorylglycerol.

[0060] (Other substances that form the outer membrane) Other substances that may form the outer membrane of the vesicle include dispersants such as nonionic surfactants and mixtures of these with cholesterols or triacylglycerols.

[0061] Among these, as the nonionic surfactant, for example, one or more of polyglycerin ether, dialkyl glycerin, 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. can be used. As the cholesterol, for example, cholesterol, α-cholestanol, β-cholestanol, cholestane, desmosterol (5,24-cholestadiene-3β-ol), sodium cholate, cholecalciferol, etc. can be used.

[0062] The outer membrane of the liposome may also be formed from a mixture of phospholipids and a dispersing agent. In the decorative sheet 10 of embodiment 1, it is preferable that the nucleating agent vesicles are radical scavenger liposomes having an outer membrane made of phospholipids, and by constructing the outer membrane from phospholipids, it is possible to ensure good compatibility between the resin material, which is the main component of the decorative sheet 10, and the vesicles.

[0063] The nucleating agent is not particularly limited as long as it is a substance that is the starting point of crystallization when the resin crystallizes. Examples of the nucleating agent include metal phosphate salts, metal benzoates, metal pimelate salts, metal rosin salts, benzylidene sorbitol, quinacridone, cyanine blue, and talc. In particular, in order to maximize the effect of the nano-processing, it is preferable to use metal phosphate salts, metal benzoates, metal pimelate salts, and metal rosin salts that are non-melting and can be expected to have good transparency, but if the material itself can be made transparent by the nano-processing, colored quinacridone, cyanine blue, talc, etc. can also be used. In addition, a non-melting nucleating agent may be appropriately mixed with melting benzylidene sorbitol.

[0064] (Features of Transparent Raw Material 20) As described above, in the decorative sheet 10 according to the first embodiment, the transparent original sheet 20 contains a resin material and a nucleating agent.

[0065] In addition, when forming the transparent raw roll 20, the nucleating agent encapsulated in vesicles is added to the resin material to crystallize the resin material, so adding the nucleating agent encapsulated in vesicles to the resin composition has the effect of dramatically improving the dispersibility of the nucleating agent in the resin material, i.e., in the transparent raw roll 20. On the other hand, it is assumed that there may be cases where it is difficult to directly identify the nucleating agent encapsulated in vesicles based on the structure and properties of the object in the completed decorative sheet 10, and this is impractical. The reasons for this are as follows.

[0066] The nucleating agent added in the form of a vesicle is dispersed with high dispersibility, and is highly dispersed in the transparent raw sheet 20 even in the laminate state, which is the precursor of the produced decorative sheet 10. However, in the process of producing the decorative sheet 10, the laminate is typically subjected to various processes such as compression and hardening, and such processes may cause the outer membrane of the vesicle containing the nucleating agent to break down or cause a chemical reaction.

[0067] For this reason, depending on the processing step of the decorative sheet 10, there is a high possibility that the outer membrane of the nucleating agent in the finished decorative sheet 10 may be broken down, or the state of the chemical reaction may vary, resulting in the nucleating agent not being contained (enveloped) by the outer membrane. Furthermore, when the nucleating agent is not encapsulated in the outer membrane, it is difficult to specify the physical properties of the nucleating agent itself within a numerical range, and it is also anticipated that it may be difficult to determine whether the material constituting the crushed outer membrane is the outer membrane of the vesicle or a material added separately from the nucleating agent.

[0068] Thus, although the present disclosure differs from the prior art in that the nucleating agent is highly dispersed in the decorative sheet 10, it is anticipated that there may be cases in which it is impractical to determine within a numerical range a structure or characteristics of the decorative sheet 10 that are analyzed based on measurements, whether this is because the nucleating agent is added in the form of vesicles encapsulating the nucleating agent.

[0069] (Sealer layer 100) The sealer layer 100 is provided to improve the adhesion between the transparent raw roll 20 and the printed pattern layer 50. The material of the sealer layer 100 is, for example, urethane resin, acrylic resin, vinyl chloride-vinyl acetate resin, etc. 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. The sealer layer 100 may also be dispersed in a binder made of a synthetic resin together with appropriate additives such as fillers, tackifiers, plasticizers, stabilizers, dispersants, defoamers, leveling agents, surfactants, and drying agents, as well as solvents or diluting solvents. The decorative sheet 10 has the sealer layer 100, which can improve the printability of the transparent raw roll 20 and the adhesion to the printed pattern layer 50. It should be noted that the sealer layer 100 does not necessarily have to be provided.

[0070] (Color difference ΔE of decorative sheet 10) The color difference ΔE between when the decorative sheet 10 is placed on a softwood MDF and when it is placed on a hardwood MDF satisfies ΔE≦2.0. When measuring the color difference ΔE, the decorative sheet that was placed on the softwood MDF (light color) and color measured is used as the decorative sheet for color measurement on the hardwood MDF (dark color). In other words, the color difference ΔE is obtained when one decorative sheet is placed on the softwood MDF (light color) and when it is placed on the hardwood MDF (dark color), and the color is measured at the same location on the decorative sheet.

[0071] Each layer constituting the decorative sheet 10, particularly the colored layer 40, is selected so that the color difference ΔE between when the decorative sheet 10 is placed on the softwood MDF and when it is placed on the hardwood MDF satisfies ΔE≦2.0.

[0072] (Line roughness Ra of decorative sheet 10) If the back surface of the decorative sheet 10, i.e., the surface on the side of the surface protective layer 60, is considered as the front side, the line roughness (arithmetic mean roughness) Ra of the surface opposite the surface protective layer 60 satisfies Ra = 0.4 μm or more and 1.2 μm or less. For example, in the case of Fig. 1, the line roughness Ra of the surface of the primer layer 30 opposite the printed pattern layer 50 satisfies Ra = 0.4 μm or more and 1.2 μm or less. In the case of a decorative sheet 10 that does not have a primer layer 30, the line roughness Ra of the surface of the colored layer 40, which is the outermost surface on the side opposite the surface protective layer 60 of the decorative sheet 10, satisfies Ra = 0.4 μm or more and 1.2 μm or less.

[0073] By providing a certain degree of roughness on the rear surface of the decorative sheet 10, the adhesiveness to the substrate is improved due to an anchoring effect.

[0074] (Method of manufacturing decorative sheet 10) The decorative sheet 10 has the above-mentioned configuration, and its manufacturing method includes the following first to fourth steps as shown in FIG. 2, and is manufactured in-line.

[0075] Here, "in-line" means that since there is no lamination process for laminating films together, printing, which is usually a multi-step process, can be performed in one line, i.e., in one line. In other words, the manufacturing process from printing to providing the surface protective layer 60 can be performed in one in-line process.

[0076] (1) First step (Figure 2(a)) The first step is a step of manufacturing a transparent raw sheet 20 by adding a dispersing agent as a nano-sized additive to a transparent polypropylene-based thermoplastic resin and extruding the resin.

[0077] (2) Second step (Figure 2(b)) The second step is a step of forming a printed pattern layer 50 on one side (rear side) of the transparent raw sheet 20 produced in the first step. In the step of forming the printed pattern layer 50, a pattern is printed using a water-based ink, and the pattern formed by the water-based ink is dried.

[0078] (3) Third step (Figure 2(c)) The third step includes a step of sequentially forming a colored layer 40 and a primer layer 30 on the printed pattern layer 50 after drying in the second step. The layers formed in the third step are not limited to the two layers of the colored layer 40 and the primer layer 30, but may be any one of these layers or three or more layers including other layers.

[0079] (4) Fourth step (Figure 2(d)) The fourth step is a step of forming a surface protective layer 60 on the other surface (front surface) of the transparent roll 20 produced in the first step, either after the third step or prior to the third step. The fourth step of forming the surface protective layer 60 may be carried out after the first step and before the second step.

[0080] (Decorative tack sheet) As shown in FIG. 1, a decorative tack sheet 11 may be formed by attaching an adhesive layer 70 and a release paper 80 to the primer layer 30 side of the decorative sheet 10 having the above-mentioned configuration, in that order from the primer layer 30 side. (Decorative materials) As shown in FIG. 3, a substrate 91 may be adhered via an adhesive layer 92 to the primer layer 30 side of the decorative sheet 10 having the above-mentioned configuration to form a decorative material 12. The decorative material 12 can also be constructed by peeling off the release paper 80 from the decorative tack sheet 11 in FIG. Here, the base material 91 may be of any type, such as wood, steel, or resin, but may be made of, for example, a fireproof steel plate or a fireproof material as specified by Notification No. 1400 of the Ministry of Construction.

[0081] (Another embodiment of the layer structure on the back side of the transparent web 20) The layer structure on the back side of the transparent web 20 may be as follows, although not shown. (a) On the back side of the transparent web 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 material roll 20, only the printed pattern layer 50, the colored layer 40 and the primer layer 30 may be formed in this order.

[0082] (Embodiment 2) Next, a decorative sheet 10 according to a second embodiment of the present invention will be described with reference to FIG. The second embodiment is characterized in that, first, the embossed portion 90 extends deeply from the surface protection layer 60 to the transparent substrate 20 . That is, the embossed portion 90 in the first embodiment extends from the surface of the surface protective layer 60 toward the transparent raw roll 20, and reaches the topcoat layer 62. In contrast, the embossed portion 90 in the second embodiment extends from the surface of the surface protective layer 60 toward the transparent raw roll 20, and a part of the embossed portion penetrates into the transparent raw roll 20, as shown in FIG.

[0083] The embossed portion 90 is formed before the resin of the transparent sheet 20 is cured. This is because the hardness of the resin increases after it is cured. Compared with the embossed portion 90 of the first embodiment, the embossed portion 90 extends to the transparent base material 20, so that the contours of the recesses are clearer and sharper, and the three-dimensional design can be further improved. Other features of the second embodiment are denoted by the same reference numerals as those of the first embodiment shown in FIG. 1, and description thereof will be omitted.

[0084] (Embodiment 3) Next, a decorative sheet according to a third embodiment of the present invention will be described with reference to FIG. The third embodiment is characterized in that the transparent raw material roll 20 is made up of three layers of two kinds. That is, the transparent raw roll 20 according to the first embodiment is formed of a single layer of transparent polypropylene, but the transparent raw roll 20 according to the third embodiment is manufactured by extrusion molding using a transparent polypropylene-based thermoplastic resin so as to have a two-type three-layer structure in the order of a transparent skin layer 21, a transparent core layer 22, and a transparent skin layer 21, and a dispersant as a nano-sized additive is added to the transparent skin layer 21. That is, the transparent skin layer 21 is formed by adding a dispersant as a nano-sized additive to a transparent polypropylene-based thermoplastic resin. In addition to the dispersant as a nano-sized additive, an inorganic filler is added to the transparent skin layer 21.

[0085] (Transparent core layer 22) In the drawings, the transparent original roll 20 is depicted as if the transparent core layer 22 and the transparent skin layer 21 form separate layers, but in reality the transparent core layer 22 and the transparent skin layer 21 are continuous and have no interface. The transparent core layer 22 is made of, for example, a transparent polypropylene resin blended with a weathering agent.

[0086] (Transparent skin layer 21) The transparent skin layer 21 is made of a transparent polypropylene resin to which an inorganic filler is added in addition to a dispersant as a nano-sized additive. The transparent skin layer 21:transparent core layer 22:transparent skin layer 21 are co-extruded to have a thickness ratio of 0.5:9:0.5 to produce a transparent raw sheet 20 with a total thickness of 50 μm.

[0087] (Resin material of transparent core layer 22) An example of the resin material constituting the transparent core layer 22 is a thermoplastic resin. There are no particular limitations on the thermoplastic resin, and materials similar to the thermoplastic resins used as base layers and the like in conventional decorative sheets 10 can be used.

[0088] 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 copolymerized polyethylene terephthalate, polyarylate, and polycarbonate; olefins such as ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-(meth)acrylic acid (ester) copolymer, and ethylene-unsaturated carboxylic acid copolymer metal neutralized product (ionomer); Examples of the resin that can be used include polyolefin 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; and mixtures, copolymers, composites, and laminates of two or more of these resins.

[0089] In particular, in light of the recent growing social interest in environmental issues, it is not preferable to use thermoplastic resins that contain chlorine (halogen), such as polyvinyl chloride resins, as thermoplastic resins, and it is preferable to use non-halogen thermoplastic resins. In particular, it is most preferable to use a polyester resin (amorphous or biaxially oriented) or a polyolefin resin, particularly a polyolefin resin, as a non-halogen-based thermoplastic resin from the viewpoints of various physical properties, processability, versatility, economic efficiency, etc. For example, it is preferable to use a polypropylene resin containing 30% by mass or more and 100% by mass or less of a highly crystalline homopolypropylene resin having an isotactic pentad fraction (mmmm fraction) of 95% or more as a polyolefin resin.

[0090] If necessary, the transparent core layer 22 may contain one or more additives selected from various additives such as fillers, ultraviolet absorbers, light stabilizers, heat stabilizers, antioxidants, antistatic agents, lubricants, flame retardants, antibacterial agents, antifungal agents, antifriction agents, light scattering agents, and gloss adjusters. (Resin material of transparent skin layer 21) An example of the resin material constituting the transparent skin layer 21 is a thermoplastic resin. There is no particular limitation on the thermoplastic resin, and the same resin material as that of the transparent core layer 22 can be used.

[0091] (Nucleating agent additive) The transparent skin layer 21 is formed, for example, from a resin material having polypropylene resin as the main component and a nucleating agent added in an amount preferably in the range of 0.05 parts by mass or more and 0.5 parts by mass or less, and more preferably 0.1 parts by mass or more and 0.3 parts by mass or less, per 100 parts by mass.

[0092] When nucleating agent vesicles are used, the amount of nucleating agent added to the resin material is the amount added converted into the nucleating agent in the nucleating agent vesicles. If the amount of the nucleating agent added is less than 0.05 parts by mass, the crystallinity of the polypropylene may not be improved sufficiently, and the scratch resistance of the transparent skin layer 21 may not be improved sufficiently. Furthermore, if the amount of nucleating agent added exceeds 0.5 parts by mass, the spherulite growth of polypropylene will be inhibited due to an excess of crystal nuclei, and as a result, the crystallinity of the polypropylene will not be sufficiently improved, and the scratch resistance of the transparent skin layer 21 may not be sufficiently improved.

[0093] Here, the term “main component” refers to a resin material that occupies 50% or more by mass of the resin material that constitutes the transparent skin layer 21 . Other features of the third embodiment are denoted by the same reference numerals as those of the first embodiment shown in FIG. 1, and description thereof will be omitted.

[0094] (Method of manufacturing the decorative sheet 10 according to the third embodiment) The manufacturing method of the decorative sheet 10 of the third embodiment is similar to that of the first embodiment, and includes the first to fourth steps, and is manufactured in-line.

[0095] (Embodiment 4) Next, a decorative sheet according to a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment combines one characteristic feature of the second embodiment and one characteristic feature of the third embodiment. Other features of the fourth embodiment are denoted by the same reference numerals as those of the first embodiment shown in FIG. 1, the second embodiment shown in FIG. 4, and the third embodiment shown in FIG. 5, and description thereof will be omitted. EXAMPLES

[0096] Examples 1 and 2 of the decorative sheet according to the present invention and Comparative Examples 1 and 2 will be described below. It should be noted that the present invention is not limited to the following Examples 1 and 2.

[0097] Example 1 In Example 1, a decorative sheet which is a single-layer sheet was produced using the following materials and procedures. First, a transparent base film with a thickness of 100 μm was produced by extrusion molding using a transparent polypropylene resin to which weathering agents, nano-sized additives such as dispersants and inorganic fillers were added. Secondly, one side of the transparent raw sheet was set as the back side, and a design was printed on this back side by gravure printing using a water-based resin as a water-based ink to form a printed design layer, and the water-based resin was dried. After the water-based ink was dried, a colored layer was formed on the printed pattern layer using a two-liquid urethane resin with added inorganic filler. At this time, the inorganic filler was added to the colored layer so that the color difference between when it was placed on the softwood plywood and when it was placed on the hardwood plywood was 2.0 or less. Thirdly, as a surface protective layer, an acrylic urethane resin manufactured by DIC Graphics Corporation was applied to a thickness of 6 μm as a low-gloss acrylic two-component curing resin to form an undercoat layer, and the same resin with a higher gloss was applied thereon to form a topcoat layer in harmony with the printed pattern layer. This resulted in the evaluation decorative sheet of Example 1.

[0098] Example 2 A decorative sheet for evaluation of Example 2 was obtained in the same manner as in Example 1, except that the thickness of the transparent raw sheet was changed from 100 μm to 70 μm.

[0099] Comparative Example 1 A decorative sheet for evaluation of Comparative Example 1 was obtained in the same manner as in Example 1, except that the printed design layer was formed by printing a design using a urethane resin. Comparative Example 2 A decorative sheet for evaluation of Comparative Example 2 was obtained in the same manner as in Comparative Example 1, except that the thickness of the transparent raw sheet was increased from 70 μm to 100 μm. (Evaluation method and criteria) Performance evaluation was carried out on each of the decorative sheets produced as described above in Examples 1 and 2 and Comparative Examples 1 and 2. The evaluation items were as follows. (1) Design (2) Weather resistance (3) Adhesion to substrate

[0100] (Design) The design of the decorative sheet for evaluation was confirmed by visual inspection. When the printed pattern layer was formed using oil-based ink and the design was comparable, it was rated as "pass" (○), and otherwise it was rated as "fail" (×).

[0101] (weather resistance) The decorative sheet was attached to a substrate via an adhesive layer to obtain a decorative material, which was then subjected to a weather resistance test using a metal weather meter. After 192 hours had passed, samples that showed no surface deterioration such as peeling of the coating were rated as passing (◯), and all others were rated as failing.

[0102] (Adhesion to substrate) A substrate was attached to the decorative sheet via the adhesive layer to obtain a decorative material. A substrate adhesion test was performed on this decorative material. Specifically, a water-based urethane adhesive was applied to one side of a 3 mm thick MDF board, and the MDF board was attached so that the side with the water-based urethane adhesive applied faced the back surface of each decorative material (the side opposite the surface protective layer). A weight of 20 kg was placed on one surface of this laminate and it was left to cure, to obtain a decorative board. A 1-inch-wide cut was made on the side of the decorative board where the decorative sheet was attached, and the decorative sheet was peeled off, and the adhesive strength at that point was measured. The condition of the peeled interface was also confirmed. The adhesion strength was measured using an Autograph AGS-X (manufactured by Shimadzu Corporation) at a load speed of 200 mm / min with the sheet and substrate set at an angle of 180°.

[0103] (Concealment) The color difference meter used was a CR-400 manufactured by Konica Minolta, Inc.

[0104] For each of the decorative sheets in the Examples and Comparative Examples, the color difference ΔE was measured for each decorative sheet when placed on softwood MDF (light color) and when placed on hardwood MDF (dark color) using CIE standard illuminant D65. At this time, in order to measure the hiding power accurately, the color difference measurement was performed at the same location for each decorative sheet, and a light-colored decorative sheet was used. When a color difference measurement was performed using a dark-colored decorative sheet, the hiding power tends to be high, so in order to avoid this, a light-colored decorative sheet was used for the measurement.

[0105] (Evaluation Criteria) The adhesion strength was rated as "○ (pass)" if it was 1.7 kgf / inch or more, and "× (fail)" if it was otherwise. The condition of the interface was visually confirmed, and if the base material was broken, it was rated as pass (○), otherwise it was rated as fail (×). Broken base material means that the decorative sheet was cut, or the layers of the sheet did not peel off, and the surface layer of the wood base material was taken by the sheet side.

[0106] (Evaluation Results) The evaluation results of each evaluation decorative sheet are as shown in Table 1 below.

[0107] [Table 1]

[0108] It was confirmed that by ensuring that the color difference between when the sheet is placed on softwood plywood and when it is placed on hardwood plywood is 2.0 or less, concealment properties can be ensured and there is no impact on the design, even when a transparent single-layer sheet is used as the transparent base material. Furthermore, it was confirmed that when the printed design layer was made from a water-based resin, it had the same performance as when the printed design layer was made from a urethane-based resin, and was comparable in design, weather resistance, and adhesion to the substrate.

[0109] The present invention can have the following configurations, for example. (1) A transparent base material made of a transparent olefin sheet; A printed pattern layer and a colored layer are formed in this order on one surface of the transparent base sheet; A surface protective layer formed on the other surface of the transparent roll, A decorative sheet in which a dispersant as a nano-sized additive is added to the transparent raw sheet, and no laminate layer made of another film is provided on either side of the transparent raw sheet, The color difference between when it is placed on softwood plywood and when it is placed on hardwood plywood is 2.0 or less, A decorative sheet, wherein the printed design layer is formed using a water-based ink. (2) The decorative sheet according to (1) above, characterized in that the surface opposite to the surface protective layer has an arithmetic mean roughness Ra of 0.4 μm or more and 1.2 μm or less. (3) The decorative sheet according to (1) or (2) above, wherein an inorganic filler is added to the transparent base sheet. (4) The decorative sheet according to any one of (1) to (3) above, characterized in that the transparent base film is a three-layer structure of two kinds, with a transparent skin layer, a transparent core layer, and a transparent skin layer laminated in that order. (5) A decorative sheet according to any one of (1) to (4) above, characterized in that an embossed portion is formed on the surface of the surface protection layer in harmony with the pattern of the printed pattern layer. (6) The decorative sheet according to any one of (1) to (5) above, further comprising a primer layer formed on the side opposite to the surface protective layer. (7) A decorative sheet according to any one of (1) to (6) above, A decorative material comprising: a substrate adhered to the side of the decorative sheet opposite the surface protective layer. (8) A step of producing a transparent raw sheet in which a dispersant as a nano-sized additive is added to a transparent polyolefin-based thermoplastic resin; forming a print pattern layer on one side of the transparent raw sheet using a water-based ink; A step of drying the printed pattern layer and then forming a colored layer on the printed pattern layer; and forming a surface protective layer on the other surface side of the transparent roll, A method for producing a decorative sheet, which is produced in-line and characterized in that the color difference between when the sheet is placed on a softwood plywood and when it is placed on a hardwood plywood is 2.0 or less. [Explanation of symbols]

[0110] 10 Decorative Sheet 11 Decorative tuck sheet 12 Cosmetic materials 20 Transparent original fabric 30 Primer layer 40 colored layer 50 Printed image layer 60 Surface protective layer 61 Undercoat layer 62 Topcoat 70 Adhesive layer 80 Release paper 90 Embossed section 100 Sealer layer

Claims

1. A transparent base material made of a transparent olefin sheet; A printed pattern layer and a colored layer are formed in this order on one surface of the transparent base sheet; A surface protective layer formed on the other surface of the transparent roll, A decorative sheet in which a dispersant as a nano-sized additive is added to the transparent raw sheet, and no laminate layer made of another film is provided on either side of the transparent raw sheet, The color difference between when the sheet is placed on a softwood plywood and when it is placed on a hardwood plywood is 2.0 or less; A decorative sheet, wherein the printed design layer is formed using a water-based ink.

2. 2. The decorative sheet according to claim 1, wherein the surface opposite to the surface protective layer has an arithmetic mean roughness Ra of 0.4 μm or more and 1.2 μm or less.

3. 2. The decorative sheet according to claim 1, wherein an inorganic filler is added to said transparent base sheet.

4. 2. The decorative sheet according to claim 1, wherein the transparent raw sheet is a three-layer structure of two kinds, in which a transparent skin layer, a transparent core layer and a transparent skin layer are laminated in this order.

5. 2. The decorative sheet according to claim 1, wherein an embossed portion is formed on the surface of said surface protective layer in a manner consistent with the design of said printed design layer.

6. 2. The decorative sheet according to claim 1, further comprising a primer layer formed on the side opposite to said surface protective layer.

7. The decorative sheet according to claim 1 ; A decorative material comprising: a substrate adhered to the side of the decorative sheet opposite the surface protective layer.

8. A step of producing a transparent raw sheet in which a dispersant as a nano-sized additive is added to a transparent polyolefin-based thermoplastic resin; forming a print pattern layer on one side of the transparent raw sheet using a water-based ink; forming a colored layer on the printed pattern layer; and forming a surface protective layer on the other surface side of the transparent roll, A method for producing a decorative sheet, which is produced in-line and has a color difference of 2.0 or less between when the sheet is placed on a softwood plywood and when the sheet is placed on a hardwood plywood.

Images