Decorative sheet, decorative tack sheet, decorative board, and production method of decorative sheet

Abstract

To provide a decorative sheet capable of reducing production processes, and suppressing deformation of a substrate by absorption and desorption of moisture.SOLUTION: A decorative sheet 10 includes: a transparent raw sheet 20 comprising a transparent olefin sheet; a printed pattern layer 50 and a colored layer 40 formed on one side face of the transparent raw sheet 20; and a surface protective layer 60 formed on the other side face of the transparent raw sheet 20, where a dispersant as a nano-sized additive is added to the transparent raw sheet 20, either of both side faces of the transparent raw sheet 20 has no laminae layer comprising other films, and the crystallinity of the decorative sheet 10 is 51% or more.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, decorative sheets for indoor use have been applied to the surfaces of interior doors, entrance storage, and other fittings, trim, moldings, baseboards, window and door frames, and other fittings, as well as flooring, etc. In recent years, olefin-based materials have mainly been used for such decorative sheets due to problems with gases during combustion (see Patent Documents 1 to 3). In order to protect the image from surface wear, a decorative sheet is widely used in which a transparent olefin sheet is laminated on top of a printed colored olefin sheet (see paragraph

[0034] and Figure 1 of Patent Document 2, and paragraph

[0059] and Figure 1 of Patent Document 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 in that it requires a printing step and a lamination step. As a method for solving this problem, it is possible to make the decorative sheet a single-layer film printed on the back side of a transparent olefin sheet, thereby eliminating the lamination step and reducing the number of manufacturing steps from printing to providing a surface protective layer.

[0005] On the other hand, examples of substrates to which the decorative sheet is adhered include wood materials such as MDF (Medium Density Fiberboard), particle board, and plywood. Substrates made of these wood materials (hereinafter also referred to as wood substrates) expand and contract due to changes in moisture content caused by moisture absorption and release. In addition, these wood substrates swell when the moisture content increases, and shrink when the moisture content decreases. The dimensional change rate of wood substrates varies depending on the material, but particle boards and MDF tend to be larger than plywood. Therefore, building materials may warp due to temperature and humidity differences between indoors and outdoors. In order to reduce the effect of moisture on wood substrates, it is necessary to stop the movement of moisture inside and outside the wood substrate. As a method for this, for example, there is a method of manufacturing a decorative sheet using a moisture-proof film such as a polysand sheet made by sandwiching PE (polyethylene) and paper, or an aluminum vapor deposition sheet. However, when manufacturing a decorative sheet using a moisture-proof film, a lamination process is required, or a dedicated device such as an aluminum vapor deposition machine is required, which may make the manufacturing process complicated. Another problem is that composite products made of PE and paper are difficult to recycle.

[0006] The present invention has been made with attention to the above-mentioned points, and aims to provide a decorative sheet, decorative tack sheet, decorative material, and a method for manufacturing a decorative sheet that can contribute to suppressing deformation due to moisture absorption and release of the substrate and reduce the number of manufacturing steps. [Means for solving the problem]

[0007] A decorative sheet according to one embodiment of the present invention comprises a transparent base film 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 film, and a surface protective layer formed on the other side of the transparent base film, in which a dispersant as a nano-sized additive is added to the transparent base film, and no laminate layer made of another film is formed on either side of the transparent base film, and the decorative sheet has a moisture permeability of 5 g / m 2 The crystallinity is 51% or more and the time is 24 hours or less. In addition, the decorative tack sheet of another aspect of the present invention is characterized in that an adhesive layer and a release paper are formed in that order on the side opposite the surface protective layer of the decorative sheet of the above-mentioned aspect.

[0008] A decorative board according to another embodiment of the present invention is characterized in that a substrate is adhered to the surface side opposite to the surface protective layer. Furthermore, a manufacturing method for decorative sheets according to another embodiment of the present invention includes a first step of manufacturing a transparent base sheet by adding a dispersing agent as a nano-sized additive to a transparent polyolefin-based thermoplastic resin and extruding the resin, a second step of forming a printed pattern layer and a colored layer in that order on one side of the transparent base sheet manufactured in the first step, and a third step of 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 the decorative sheet is formed so that the crystallinity of the decorative sheet is 51% or more. Effect of the Invention

[0009] According to one aspect of the present invention, it is possible to reduce the number of manufacturing steps while suppressing deformation of a base material due to moisture absorption and release. [Brief description of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view showing a schematic example of a decorative sheet according to embodiment 1. FIG. [Diagram 2] FIG. 4 is a cross-sectional view that illustrates a schematic example of a decorative sheet according to a second embodiment. [Diagram 3] FIG. 11 is a cross-sectional view that illustrates a schematic example of a decorative sheet according to a third embodiment. [Figure 4] FIG. 11 is a cross-sectional view that illustrates a schematic example of a decorative sheet according to embodiment 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (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.

[0012] 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 such as interior doors and entrance storage, trim, moldings, baseboards, window frames, door frames, and other fittings, and is used by matching the patterns of fittings and fittings for each house or room. The decorative sheet 10 includes the following layers, which are provided in the order starting from (1). The following (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 structure has a crystallinity of 51% or more, and therefore has a moisture permeability of 5 g / m 2 The decorative sheet 10 preferably has a hardness of 3B or more in the pencil hardness test according to JIS K 5600.

[0013] 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. The decorative sheet 10 may also have an embossed portion 90 formed on the front 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 bonded to the surface of the primer layer 30 opposite the colored layer 40 to form a decorative board.

[0014] Furthermore, the above-mentioned "(1) primer layer 30" may be omitted in the decorative sheet 10. That is, if the above-mentioned "(2) colored layer 40" has the function of a primer layer, the primer layer 30 can be omitted. As shown in FIG. 2, a sealer layer 100 may be provided between the printed pattern layer 50 and the transparent base material 20 in order to improve the printability of the transparent base material 20 and its adhesion to the printed pattern layer 50. In addition, a moisture-proof layer may be provided on the primer layer 30 side of the decorative sheet 10. In this case, the moisture-proof layer may be provided on the side of the primer layer 30 opposite the colored layer 40. If the primer layer 30 is not provided, the moisture-proof layer may be provided on the side of the colored layer 40 opposite the printed pattern layer 50.

[0015] (Main features of decorative sheet 10) The main features of the decorative sheet 10 according to the first embodiment are as follows. (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 this order from the transparent original roll 20 side on the back side 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 no laminate layer made of other films is formed on either the front side or the back side of the transparent original roll 20. The transparent original roll 20 is a single layer, or is manufactured by extrusion molding using a transparent polypropylene-based thermoplastic resin so as to have a two-kind, 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 original roll in the case of a single layer structure, or to the transparent skin layer 21 in the case of a two-kind, three-layer structure.

[0016] The decorative sheet 10 of embodiment 1 does not require a lamination process with 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. Furthermore, because conventional decorative sheets are multi-layered, there are limitations to thinning the sheet due to film formation, and there is also the problem that the sheet cannot be made hard enough, but the decorative sheet 10 according to embodiment 1 is a single layer, so it is easy to thin it, and furthermore, by using nano-sized additives, the sheet can be made hard even when thin, which allows it to have excellent moisture resistance.

[0017] (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.

[0018] (3) The decorative sheet 10 according to the first embodiment has a moisture permeability of 5 g / m 2 The crystallinity is 51% or more and the time is 24 hours or less. Here, the applicant has found that the decorative sheet 10 has a tendency to have a lower moisture permeability as the crystallinity is increased, and that when the crystallinity is 51% or more, the moisture permeability is 5 g / m 2 It was found that the time required for the aging process was less than 24 hours. Therefore, by forming the decorative sheet 10 so that the crystallinity is 51% or more, a decorative sheet 10 with low moisture permeability can be obtained without using a polysand sheet or moisture-proof film, and the occurrence of warping, dimensional changes, etc., when attached to a wood substrate can be suppressed. Also, a decorative sheet with low moisture permeability can be easily obtained without increasing the number of manufacturing steps. Moreover, since a decorative sheet with low moisture permeability and consisting of a single layer can be obtained, it can be realized without using a dedicated machine for suppressing moisture permeability, and by making it a mono-material, recycling can be easily performed.

[0019] Furthermore, the decorative sheet 10 can reduce its moisture permeability by being formed so that its hardness in a pencil hardness test conforming to JIS K 5600 is 3B or more, i.e., 3B or harder than 3B. In other words, the decorative sheet 10 tends to have lower moisture permeability as its hardness in a pencil hardness test conforming to JIS K 5600 increases, and if its hardness in a pencil hardness test is 3B or more, its moisture permeability is 5 g / m 2 Therefore, by forming the decorative sheet 10 so that the hardness in the pencil hardness test according to JIS K 5600 is 3B or more, the moisture permeability is 5 g / m 2 A decorative sheet 10 that lasts for 24 hours or less can be formed.

[0020] (4) The decorative sheet 10 according to the first embodiment has a moisture permeability of 5 g / m 2 By setting the storage time to about 24 hours or less, warping or the like caused by moisture absorption and release of the decorative sheet 10 can be suppressed. Preferably, the moisture permeability is 3 g / m 2 By manufacturing the decorative sheet 10 so that the storage life is about 24 hours or less, warping or the like caused by moisture absorption and release of the decorative sheet 10 can be more reliably suppressed.

[0021] (5) 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.

[0022] (6) 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.

[0023] 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 user later wishes to change the surface of a decorative board that has been finished in white to a wood grain look, it is possible to change the surface to a wood grain look by attaching the decorative tack sheet 11 according to this embodiment 1 on top.

[0024] (7) The decorative tack sheet 11 according to embodiment 1 has the adhesive layer 70 and the release paper 80 on the primer layer 30 side, so that it can be adhered easily and quickly.

[0025] (8) The decorative board according to embodiment 1 can be easily and quickly used as a decorative board by adhering a substrate to the primer layer 30 side.

[0026] (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.

[0027] (Composition of each layer) (Transparent original fabric 20) The transparent raw material 20 serves as a support for the decorative sheet 10 and is made of a transparent olefin sheet. As shown in FIG. 1, the transparent raw sheet 20 is manufactured from three layers of two kinds, that is, a transparent skin layer 21, a transparent core layer 22 made of transparent polypropylene, and another transparent skin layer 21 in this order. 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.

[0028] (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. 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.

[0029] (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 base roll 20, and is formed by a printing method, and is a concealing layer 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 may be a solid layer.

[0030] (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 urethane resin by, for example, gravure printing. As the printing method, for example, gravure printing has been exemplified, but this is not limited thereto, and various printing methods such as offset printing, letterpress printing, flexographic printing, screen printing, inkjet printing, and electrostatic printing can be applied.

[0031] 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. Although a urethane-based resin has been exemplified as the printing ink, the present invention is not limited thereto, and may be, for example, a colorant such as an organic or inorganic dye or pigment, or may be dispersed in a binder made of a synthetic resin or the like together with appropriate additives such as a filler, a tackifier, a plasticizer, a stabilizer, a dispersant, an antifoaming agent, a leveling agent, a surfactant, a drying agent, or a solvent or a diluent.

[0032] (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. 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.

[0033] 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. 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.

[0034] 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 . 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.

[0035] Furthermore, the surface protective layer 60 is subjected to an antiviral treatment. 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. 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.

[0036] (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.

[0037] The transparent raw material roll 20 is composed of a transparent skin layer 21 / transparent core layer 22 / transparent skin layer 21 each made of a transparent olefin sheet, but is not limited thereto, and may be composed of, for example, a single-layer film (transparent layer) made of a transparent olefin sheet, as shown in Fig. 3. In this case, the single-layer film (transparent layer) corresponds to the transparent raw material roll 20. The "transparent layer" of the above single-layer film (transparent layer) contains a dispersant as a nano-sized additive, similar to the transparent skin layer 21 described later. In addition, the "transparent layer" also contains a weathering agent blended therein, similar to the transparent core layer 22 described later.

[0038] (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.

[0039] (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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] (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.

[0044] (Nano-sized additives, etc. (nucleating agents)) The transparent skin layer 21 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 skin layer 21 may be encapsulated in vesicles with a portion of the nucleating agent exposed. Since the transparent skin layer 21 contains a nucleating agent, the crystallization degree can be improved, and the scratch resistance (scratch resistance) of the decorative sheet 10 can be improved.

[0045] (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. 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.

[0046] 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.

[0047] 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. 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.

[0048] 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. 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.

[0049] 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. 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 .

[0050] (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.

[0051] 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.

[0052] (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. 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] (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. Nucleating vesicles whose outer membrane is composed of materials that include biological lipids, such as phospholipids, are referred to herein as nucleating liposomes.

[0057] 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.

[0058] (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.

[0059] 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. The outer membrane of the liposome may also be formed from a mixture of phospholipids and a dispersing agent.

[0060] 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.

[0061] 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.

[0062] (Features of Transparent Skin Layer 21) As described above, the decorative sheet 10 according to the first embodiment is characterized in that the transparent skin layer 21 contains a resin material and a nucleating agent. Furthermore, the decorative sheet 10 according to the present 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 encapsulated in vesicles to the resin composition, 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 assumed that there may be cases where it is difficult to directly identify the nucleating agent encapsulated in the vesicles based on the structure and properties of the finished decorative sheet 10, and this is impractical. The reasons for this are as follows.

[0063] The nucleating agent added in the form of a vesicle is dispersed with high dispersibility, and is highly dispersed in the transparent skin layer 21 even in the state of the laminate, which is the precursor of the produced decorative sheet 10.

[0064] 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. 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.

[0065] 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. 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.

[0066] (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.

[0067] (Degree of crystallinity of decorative sheet 10) The decorative sheet 10 is formed so that its crystallinity is 51% or more. Possible methods for adjusting the crystallinity of the decorative sheet 10 include, for example, the addition of a dispersant as a nano-sized additive to the transparent base material 20, and the amount of dispersant added. By improving the crystallinity, it is possible to reduce the moisture permeability, and by forming the decorative sheet so that the crystallinity is 51% or more, the moisture permeability of the decorative sheet 10 can be reduced to 5 g / m 2 Can be less than 24 hours.

[0068] (Hardness of decorative sheet 10) The decorative sheet 10 is formed so that the hardness of the decorative sheet 10 is 3B or more in a pencil hardness test in accordance with JIS K 5600, i.e., 3B or harder. In other words, each layer constituting the decorative sheet 10 is formed so that the hardness of the decorative sheet 10 is 3B or more in a pencil hardness test. Possible methods for adjusting the hardness of the decorative sheet 10 include, for example, a method of adjusting the thickness of the transparent base roll 20, a method of adding or not adding a dispersant as a nano-sized additive to the transparent base roll 20, and the like. By forming the decorative sheet 10 so that the hardness of the decorative sheet is 3B or more in a pencil hardness test, the moisture permeability can be reduced, and by forming the decorative sheet so that the hardness of the decorative sheet is 3B or more in a pencil hardness test, the moisture permeability of the decorative sheet can be reduced. 2 Can be less than 24 hours.

[0069] (Moisture permeability of decorative sheet 10) The decorative sheet 10 has a moisture permeability of 5 g / m 2 It is preferable that the moisture permeability is 3 g / m or less from the viewpoint of suppressing warping of the decorative board. 2 - Preferably less than 24 hours.

[0070] (Method of manufacturing decorative sheet 10) The decorative sheet 10 has the above-mentioned configuration, and its manufacturing method includes the following first to third steps, in which the sheet is manufactured in-line. 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.

[0071] (1) First step The first step is to manufacture a transparent original sheet 20 by extrusion molding 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 and made of thermoplastic resin to which a dispersant as a nano-sized additive has been added.

[0072] (2) The second step The second step is a step of forming the printed pattern layer 50, the colored layer 40, and the primer layer 30 in this order on one surface (rear surface) of the transparent web 20 produced in the first step. 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, but may be, for example, just one layer including at least the printed pattern layer 50, or may be a total of two layers including the printed pattern layer 50 and one of the colored layer 40 or the primer layer 30, or may be four or more layers.

[0073] (3) The third step The third 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 second step or prior to the second step. There are two possible orders for the above steps: the first step, the second step, and the third step, and the first step, the third step, and the second step.

[0074] (Decorative Tack Sheet 11) As shown in FIG. 1, the decorative tack sheet 11 is the decorative sheet 10 having the above-mentioned structure, with an adhesive layer 70 and a release paper 80 attached to the primer layer 30 side.

[0075] (Decorative board) Although not shown, the decorative board is formed by adhering a substrate to the primer layer 30 side of the decorative sheet 10 having the above-mentioned configuration using an adhesive or the like. The decorative board can also be constructed by peeling off the release paper 80 of the decorative tack sheet 11 in FIG. 1 and adhering a substrate directly to the adhesive layer 70. Here, the substrate may be of any type, such as wood, steel, or resin, but may be made of, for example, a non-combustible steel plate or a non-combustible material as specified in Notification No. 1400 of the Ministry of Construction.

[0076] (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.

[0077] (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. 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.

[0078] (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 formed of a single layer. That is, in the decorative sheet 10 according to the first embodiment shown in Fig. 1, the transparent original roll 20 is made up of three layers of two types. In contrast, the transparent original roll 20 according to the third embodiment is made up of a single layer, as shown in Fig. 3. The transparent raw sheet 20 is characterized in that a dispersant is added as a nano-sized additive. The transparent raw sheet 20 is a single layer compared to the multi-layer transparent raw sheet 20 of embodiment 1, and therefore can be easily thinned. Furthermore, by using nano-sized additives, the sheet can be made hard even when thin. 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.

[0079] (Method of manufacturing the decorative sheet 10 according to the third embodiment) A method for producing the decorative sheet 10 of the third embodiment will be described below. The manufacturing method of the third embodiment, like that of the first embodiment described above, comprises the first to third steps and is an in-line manufacturing method. The first step is to manufacture a transparent raw sheet by adding a dispersant as a nano-sized additive to a transparent polyolefin thermoplastic resin and extruding the resin. The second step is to form a printed pattern layer on the back side of the transparent raw sheet manufactured in the first step. The third step is to form a surface protective layer on the front side of the transparent raw sheet after or prior to the second step.

[0080] (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. 2, and the third embodiment shown in FIG. 3, and the description thereof will be omitted. EXAMPLES

[0081] Examples 1 to 3 of the decorative sheet according to the present invention and Comparative Example 1 will be described below. However, the present invention is not limited to the following examples.

[0082] 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 a weathering agent and a dispersing agent as a nano-sized additive were added. The amount of the nano-sized additive added was 0.1 parts by mass. Secondly, a design was printed on the back side of the transparent base material using a urethane resin by gravure printing, and a colored layer was formed on top of that using a two-component urethane resin. Thirdly, on the colored layer, a 1 g / m2 solids layer was printed by gravure printing. 2 A urethane resin was applied so as to form a primer layer. Fourth, a low-gloss acrylic two-component curing resin (acrylic urethane resin manufactured by DIC Graphics Inc.) was applied to the front side of the transparent base roll to a thickness of 6 μm as a surface protective layer to form an undercoat layer, and then a topcoat layer was formed on top of this by printing a pattern that matched the printed pattern layer using the same resin with a higher gloss.

[0083] Example 2 In Example 2, a decorative sheet of Example 2 was produced in the same manner as in Example 1, except that in the decorative sheet of Example 1, the amount of the nano-sized additive added was reduced to 0.01 parts by mass.

[0084] Example 3 In Example 3, a decorative sheet of Example 3 was produced in the same manner as in Example 1, except that in the decorative sheet of Example 1, the thickness of the transparent original sheet was reduced from 100 μm to 70 μm.

[0085] Comparative Example 1 The decorative sheet of Comparative Example 1 was produced in the same manner as Example 1, except that, compared to Example 1, no dispersant or other nano-sized additive was added to the transparent base sheet. (Evaluation method and criteria) Performance evaluation was carried out for each of the decorative sheets produced as described above in Examples 1 to 3 and Comparative Example 1. The evaluation method was as follows. (1) Scratch test (2) Scratch hardness test (pencil hardness) (3) Moisture permeability measurement (cup method) (4) Crystallinity measurement (5) Warping test (deformation measurement)

[0086] Here, (1) scratch test and (2) scratch hardness test (pencil hardness) are performed by applying a water-based urethane adhesive to each of the decorative sheets of the Examples and Comparative Examples on 3 mm thick MDF (medium density fiberboard), laminating the sheets together, and compressing them using a press at 30° C. to 50° C. to form a decorative board. (3) Moisture permeability measurement and crystallinity measurement are performed on the decorative sheet.

[0087] (Scratch test) For the scratch test, a coin scratch test was performed on each of the decorative sheets attached to the MDF, and the load at which no continuous scratches were produced on the surface of the decorative sheet was measured. In the scratch test, a 10 yen coin was placed on the surface of the decorative sheet, and the test was started with a load of 1 kg, and the load was gradually increased by 1 kg each time up to 4 kg.

[0088] (Scratch hardness test) The scratch hardness test was carried out for each decorative sheet attached to the MDF, using the scratch hardness (pencil method) test specified in JIS K5600-5-4:1999 to measure the hardness of the hardest pencil that did not leave a scratch on the surface of the decorative sheet (pencil hardness).

[0089] (Moisture permeability measurement (cup method)) Moisture permeability is measured according to the method specified in JIS A 1324, Method for Measuring Moisture Permeability of Building Materials, Cup Method. Specifically, a moisture absorbent is placed in the bottom of a cup that is impermeable to water vapor, and four decorative sheets to be used as samples are attached to the cups and sealed with aluminum tape. The samples are placed in a thermo-hygrostat set at a temperature of 23°C and a relative humidity of 50%, and are removed after 120 hours. The increase in mass of the cup is measured to determine the amount of permeation through the sample.

[0090] (Crystallization measurement) The degree of crystallinity is measured by calculating the peak intensity ratio x from the absorption spectrum obtained in Fourier infrared spectroscopy of the decorative sheet using the following formula (1), and this peak intensity ratio x is used as a value equivalent to the degree of crystallinity. Peak intensity ratio x = (I997-I938) / (I973-I938)...(1) In equation (1), I997 is the wave number 997 cm -1 The peak intensity value of I938 is the wave number 938cm -1 The peak intensity value of I973 is the wave number 973 cm -1 represents the peak intensity value.

[0091] (Warpage test) Decorative materials in which the decorative sheets of the Examples and Comparative Examples were bonded to a wood substrate were left in a thermo-hygrostat at a temperature of 40°C and a humidity of 40% for two weeks, and the warping of the decorative materials in the width direction in a hygroscopic state was measured.

[0092] (Evaluation Criteria) (a) In the scratch test, a load of 1 kg or more was considered a pass, and anything other than that was considered a fail. (b) In the scratch hardness test, a pencil hardness of 3B or more was considered to be a pass, 2B or more was considered to be a good grade, and 3B was considered to be a fair grade. In addition, samples softer than 3B were considered to be poor. (c) The moisture permeability measurement was performed to determine whether the moisture permeability was 5 g / m 2 - The test is considered to pass when the moisture permeability is less than 5g / m 2 If the moisture permeability is greater than 24 hours, it is considered a failure (×). 2 - 24 hours or less: "◎"; moisture permeability is 3g / m 2 5g / m2 or more for 24 hours 2 - If it is less than 24 hours, it is marked as "○". (d) The crystallinity, that is, the peak intensity ratio x, of 51% or more was evaluated as a pass mark "◯", and the rest was evaluated as a fail mark "X". (e) In the warping test, if the maximum warping value of the decorative material in the width direction was less than 0.4 mm, it was marked as "Good", and if it was 0.4 or more, it was marked as "Poor".

[0093] (Evaluation Results) The evaluation results for each decorative sheet are as shown in Table 1 below.

[0094] [Table 1]

[0095] The decorative sheets of Examples 1 to 3 passed all of the scratch test, scratch hardness test, moisture permeability test, warpage test and crystallinity test. By adjusting the thickness of the transparent base sheet and the amount of nano-sized additives added and increasing the crystallinity, the decorative sheets of Examples 1 to 3 were able to achieve a thickness of 5 g / m 2 It was confirmed that a lower moisture permeability could be obtained than after 24 hours, and as a result, the amount of deformation was small. On the other hand, in the case of Comparative Example 1, although the scratch test was passed, since no nano-sized additive was added, sufficient scratch strength, crystallinity and moisture permeability could not be obtained, and as a result, it was confirmed that the amount of deformation was not suppressed.

[0096] 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, Moisture permeability is 5g / m 2 A decorative sheet characterized by a crystallinity of 51% or more and a shelf life of 24 hours or less. (2) The decorative sheet according to (1) above, characterized in that the hardness in a pencil hardness test according to JIS K 5600 is 3B or more. (3) The decorative sheet according to (1) or (2) above, characterized in that the transparent raw sheet is a two-kind three-layer structure in which a transparent skin layer, a transparent core layer and a transparent skin layer are laminated in this order. (4) The decorative sheet according to (3) above, wherein the transparent skin layer contains an inorganic filler. (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) The decorative sheet according to any one of (1) to (5) above, further comprising a moisture-proof layer formed on the side opposite to the surface protective layer. (8) The decorative sheet according to any one of (1) to (5) above, characterized in that a moisture-proof layer and a primer layer are formed in this order on the side opposite to the surface protective layer. (9) A decorative tack sheet using the decorative sheet described in any one of (1) to (8) above, characterized in that an adhesive layer and a release paper are formed in that order on the side opposite the surface protective layer. (10) A decorative board using the decorative sheet according to any one of (1) to (8) above, characterized in that a substrate is adhered to the side opposite to the surface protective layer. (11) The decorative board according to (10) above, characterized in that a moisture-proof film is adhered to the surface of the substrate opposite to the decorative sheet. (12) A method for producing a decorative sheet, comprising: A first step of manufacturing a transparent raw sheet by adding a dispersing agent as a nano-sized additive to a transparent polyolefin-based thermoplastic resin and extruding the resin; A second step of forming a printed pattern layer and a colored layer in this order on one surface of the transparent raw sheet produced in the first step; A third step of forming a surface protective layer on the other surface side of the transparent roll, A method for producing a decorative sheet, comprising the steps of producing the decorative sheet in-line and forming the decorative sheet so that the crystallinity of the decorative sheet is 51% or more. [Explanation of symbols]

[0097] 10 Decorative Sheet 11 Decorative tuck sheet 20 Transparent original fabric 21 Transparent Skin Layer 22 Transparent core layer 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, Moisture permeability is 5g / m ２ A decorative sheet characterized in that the time is 24 hours or less and the crystallinity is 51% or more.

2. 2. The decorative sheet according to claim 1, which has a hardness of 3B or more in a pencil hardness test according to JIS K 5600.

3. 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.

4. 4. The decorative sheet according to claim 3, wherein said transparent skin layer contains an inorganic filler.

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

8. 2. The decorative sheet according to claim 1, further comprising a moisture-proof layer and a primer layer formed in this order on the side opposite to the surface protective layer.

9. 2. A decorative tack sheet using the decorative sheet according to claim 1, characterized in that an adhesive layer and a release paper are formed in this order on the side opposite to the surface protective layer.

10. 2. A decorative board using the decorative sheet according to claim 1, further comprising a substrate bonded to the surface opposite to the surface protective layer.

11. 11. The decorative board according to claim 10, further comprising a moisture-proof film adhered to the surface of the substrate opposite to the decorative sheet.

12. A method for producing a decorative sheet, comprising: A first step of manufacturing a transparent raw sheet by adding a dispersing agent as a nano-sized additive to a transparent polyolefin-based thermoplastic resin and extruding the resin; A second step of forming a printed pattern layer and a colored layer in this order on one surface of the transparent raw sheet produced in the first step; A third step of forming a surface protective layer on the other surface side of the transparent roll, A method for producing a decorative sheet, comprising the steps of producing the decorative sheet in-line and forming the decorative sheet so that the crystallinity of the decorative sheet is 51% or more.

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