Decorative sheet and decorative material

Abstract

To provide a decorative sheet and a decorative material which can suppress deterioration in designability.SOLUTION: There are provided a decorative material 10 which has a substrate 7 and a decorative sheet 1 laminated on one surface of the substrate 7, wherein the decorative sheet 1 has a substrate layer 2, an aggregate layer 3, a printed pattern layer 4 and a surface protective layer 5, the aggregate layer 3 contains a mixture of an acrylic resin whose mixing ratio to 100 mass% of the aggregate layer 3 is in the range of 5 mass% or more and 15 mass% or less and an inorganic filler whose mixing ratio to 100 mass% of the aggregate layer 3 is in the range of 85 mass% or more and 95 mass% or less, the aggregate layer 3 has a thickness in the range of 0.2 mm or more and 4.0 mm or less and the inorganic filler includes a filler having particle size distribution in the range of 50 μm or more and 500 μm or less and the surface opposite to the surface facing the printed pattern layer 4 of the surface protective layer 5 has a surface Kurtosis (Sku) in the range of 3.0 or more and 30 or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Decorative materials for decorating walls and floors of buildings and the like include, for example, the one disclosed in Patent Document 1. The decorative material disclosed in Patent Document 1 includes a sheet material containing synthetic resins, aggregates, and a heat-absorbing substance, and a surface protective layer laminated on one side of the sheet material and formed using an inorganic resin or an organic resin with added inorganic nanofiller. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-079630 Summary of the Invention [Problem to be solved by the invention]

[0004] Common decorative materials, including the decorative material disclosed in Patent Document 1, include sheets with stone patterns printed on them and wall plaster materials, for example, when creating a stone-like appearance, but these surface materials are stone-like in nature and have a different design from natural stone. Therefore, when expressing the atmosphere of natural stone, a method of forming decorative sheets or decorative materials using cut natural stone can be considered. However, it is difficult to form decorative sheets or decorative materials using natural stone due to its weight, etc. In addition, when forming decorative materials using natural stone, the ability to conform to curved surfaces such as cylinders is reduced, which causes damage to the surface (design surface) of the decorative sheet and reduces the design. Therefore, there is a problem that it is difficult to form decorative sheets or decorative materials with high design quality.

[0005] In view of the above-mentioned problems, an object of the present invention is to provide a decorative sheet and a decorative material that are capable of suppressing deterioration in design. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, one aspect of the present invention is a decorative sheet including a base layer, an aggregate layer, a print pattern layer, and a surface protective layer. The aggregate layer is a layer laminated on one surface of the base layer. The print pattern layer is a layer laminated on the surface of the aggregate layer opposite to the surface facing the base layer. The surface protective layer is a layer laminated on the surface of the print pattern layer opposite to the surface facing the aggregate layer. The aggregate layer includes a mixture of an acrylic resin having a mixing ratio of 5% by mass to 15% by mass with respect to 100% by mass of the aggregate layer and an inorganic filler having a mixing ratio of 85% by mass to 95% by mass with respect to 100% by mass of the aggregate layer. The thickness of the aggregate layer is in the range of 0.2 mm to 4.0 mm. Furthermore, the inorganic filler includes a filler having a particle size distribution in the range of 50 μm to 500 μm. The surface kurtosis (Sku) of the surface protective layer opposite to the surface facing the printed pattern layer is in the range of 3.0 or more and 30 or less.

[0007] In order to solve the above-mentioned problems, one aspect of the present invention is a decorative material comprising a substrate and a decorative sheet laminated on at least one surface of the substrate. Effect of the Invention

[0008] According to one aspect of the present invention, it is possible to provide a decorative sheet and a decorative material that are capable of suppressing deterioration in design. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a cross-sectional view showing the configuration of a decorative sheet and a decorative material in the first embodiment. [Diagram 2] FIG. 4 is a diagram showing an example of a pattern formed on a printed pattern layer. [Diagram 3] 13A to 13C are diagrams showing modified examples of the pattern formed on the printed pattern layer. [Figure 4] FIG. 11 is a cross-sectional view showing the configuration of a decorative sheet and a decorative material in a modified example of the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present technology will be described with reference to the drawings. In the description of the drawings, the same or similar parts are denoted with the same or similar reference numerals, and duplicated descriptions are omitted. Each drawing is schematic and may differ from the actual one. The embodiments shown below are examples of devices and methods for embodying the technical idea of ​​the present technology, and the technical idea of ​​the present technology is not limited to the devices and methods exemplified in the following embodiments. The technical idea of ​​the present technology can be modified in various ways within the technical scope described in the claims. In addition, the directions of "left and right" and "up and down" in the following description are merely definitions for the convenience of explanation and do not limit the technical idea of ​​the present invention. Therefore, for example, if the paper is rotated 90 degrees, "left and right" and "up and down" are read interchangeably, and of course, if the paper is rotated 180 degrees, "left" becomes "right" and "right" becomes "left".

[0011] First embodiment The configuration of a decorative sheet 1 in a first embodiment will be described below with reference to FIG. As shown in FIG. 1, the decorative sheet 1 includes a base layer 2, an aggregate layer 3, a print pattern layer 4, and a surface protection layer 5.

[0012] <Base material layer> The base layer 2 is a layer that serves as the base material of the decorative sheet 1 . In the first embodiment, as an example, the material of the base layer 2 is a polyester fiber having a basis weight of 48 [g / m 2 The case where a glass nonwoven fabric of the above formula is used will be described.

[0013] <Aggregate layer> The aggregate layer 3 is a layer laminated on one surface (the upper surface in FIG. 1) of the base material layer 2, and contains a mixture of an acrylic resin and an inorganic filler. The basis weight of the mixture of acrylic resin and inorganic filler is approximately 2200 [g / m 2 ].

[0014] The mixing ratio of the acrylic resin to 100% by mass of the aggregate layer 3 is within a range of 5% by mass to 15% by mass. The glass transition point of acrylic resin is within the range of -40°C or higher and 10°C or lower.

[0015] The mixing ratio of the inorganic filler to 100 mass [%] of the aggregate layer 3 is within a range of 85 mass [%] or more and 95 mass [%] or less. The inorganic filler includes a filler having a particle size distribution (average particle size distribution) in the range of 50 μm to 500 μm.

[0016] At least one of the components contained in the inorganic filler is a hydrate. In the first embodiment, as an example, a case will be described in which the components contained in the inorganic filler are calcium carbonate and aluminum hydroxide. The thickness of the aggregate layer 3 is within a range of 0.2 mm to 4.0 mm.

[0017] <Printed pattern layer> The print pattern layer 4 is a layer that is laminated on one surface of the aggregate layer 3 (the upper surface in FIG. 1). Moreover, the print pattern layer 4 is formed mainly from epoxy resin. Furthermore, the print pattern layer 4 contains an inorganic pigment whose mixing ratio with respect to 100 mass % of the epoxy resin is 15 mass % or less. The print pattern layer 4 is formed by inkjet printing.

[0018] Furthermore, a pattern is formed on the print pattern layer 4 by printing. The pattern formed on the printed pattern layer 4 is formed from at least three different patterns created based on image data formed using a natural stone pattern (image data formed to imitate a natural stone pattern).

[0019] In the first embodiment, as an example, a case will be described in which the pattern formed on the printed pattern layer 4 is formed from six or more different patterns created based on image data, as shown in Figure 2. Specifically, the pattern shown in Fig. 2 is formed from six different patterns (P1, P2, P3, P4, P5, P6) created based on image data formed using natural stone patterns. Note that the pattern shown in Fig. 2 is a schematic representation of the patterns created based on image data formed using natural stone patterns. Patterns P1 and P2 are formed by inverting the same pattern horizontally, while patterns P3 and P4 are formed by inverting the same pattern vertically, and patterns P5 and P6 are formed by inverting the same pattern vertically and horizontally.

[0020] <Surface protective layer> The surface protective layer 5 is laminated on one side of the printed pattern layer 4 (the upper side in FIG. 1), and is a layer provided to impart functions such as weather resistance, scratch resistance, stain resistance, and design properties to the decorative sheet 1. The thickness of the surface protection layer 5 is within a range of 3 μm to 10 μm. The surface protective layer 5 is formed mainly from acrylic, fluorine, silicone, or a mixture or copolymer of at least two of acrylic, fluorine, and silicone. Furthermore, the surface protective layer 5 contains silica (matting agent) whose mixing ratio with respect to 100 mass [%] of the main component is within the range of 10 mass [%] to 50 mass [%].

[0021] Furthermore, due to the above-mentioned configuration, the surface of surface protection layer 5 opposite to the surface facing printed pattern layer 4 (the upper surface in FIG. 1) has a surface kurtosis (Sku) in the range of 3.0 to 30. Note that surface kurtosis is a value indicating the height distribution, and is sometimes referred to as "kurtosis." That is, the outermost surface of the decorative sheet 1 has a surface kurtosis (Sku) in the range of 3.0 or more and 30 or less.

[0022] <Emboss> As shown in Fig. 1, embossments 6 are formed at multiple locations on the aggregate layer 3, the printed pattern layer 4, and the surface protective layer 5. That is, the aggregate layer 3, the printed pattern layer 4, and the surface protective layer 5 are embossed. The embossing is performed by pressing an embossing mold. The embossing mold is formed by molding a natural stone material as a manuscript. The embossing mold may also be formed by a 3D printer or a coating material formed by a plasterer. Specifically, the embossing is performed on the aggregate layer 3 of the sheet formed by laminating the aggregate layer 3 on one surface of the base layer 2. As a result, recesses corresponding to the embossments 6 are formed in the aggregate layer 3, and then the printed pattern layer 4 and the surface protective layer 5 are formed, resulting in a configuration in which the aggregate layer 3, the printed pattern layer 4, and the surface protective layer 5 are embossed. Therefore, the configuration results in the embossments 6 being formed in the aggregate layer 3, the printed pattern layer 4, and the surface protective layer 5.

[0023] (Decorative materials) The decorative material 10 is, for example, a panel for decorating the wall surface of a building, and comprises a decorative sheet 1 and a substrate 7. The substrate 7 is formed into a plate shape using, for example, a wood board, an inorganic board, a metal plate, or the like, and has a decorative sheet 1 laminated on one surface (the upper surface in FIG. 1). That is, the decorative material 10 comprises the substrate 7 and the decorative sheet 1 laminated on one surface of the substrate 7.

[0024] The above-described first embodiment is one example of the present invention, and the present invention is not limited to the above-described first embodiment. Various modifications can be made depending on the design, etc., even if the modifications are in a form other than the first embodiment, as long as they do not deviate from the technical idea of ​​the present invention.

[0025] (Effects of the First Embodiment) The decorative sheet 1 of the first embodiment can provide the following effects. (1) The aggregate layer 3 contains a mixture of an acrylic resin whose mixing ratio with respect to 100 mass [%] of the aggregate layer 3 is within the range of 5 mass [%] or more and 15 mass [%] or less, and an inorganic filler whose mixing ratio with respect to 100 mass [%] of the aggregate layer 3 is within the range of 85 mass [%] or more and 95 mass [%] or less. The thickness of the aggregate layer 3 is within the range of 0.2 [mm] or more and 4.0 [mm] or less. Furthermore, the inorganic filler contains a filler whose particle size distribution is within the range of 50 [μm] or more and 500 [μm] or less. In addition, the surface of the surface protection layer 5 opposite to the surface facing the print pattern layer 4 has a surface kurtosis (Sku) within the range of 3.0 or more and 30 or less.

[0026] Therefore, by setting the mixing ratio of the mixture of acrylic resin and inorganic filler to the aggregate layer 3 within the above-mentioned range, and further setting the particle size distribution of the inorganic filler within the above-mentioned range, it is possible to impart to the surface of the decorative sheet 1 a luster and texture similar to that of natural stone. This makes it possible to impart to the surface of the decorative sheet 1 a design similar to that of natural products that are primarily made of inorganic matter, such as natural stone, and thus makes it possible to provide a decorative sheet 1 that can suppress deterioration of the design.

[0027] Furthermore, by setting the thickness of the aggregate layer 3 within the range of 0.2 mm to 4.0 mm, it is possible to improve the ability of the decorative sheet 1 to conform to the curved surface forming a cylinder or the like. As a result, it is possible to prevent a decrease in the ability to conform to curved surfaces, which in turn makes it possible to prevent damage to the surface (design surface) of the decorative sheet 1 and thus to prevent a decrease in the design. It is also possible to impart to the surface of the decorative sheet 1 a texture similar to that of natural materials that are primarily made of inorganic matter, such as natural stone. When using natural stone to form decorative sheets or materials, one method is to pour resin over the natural stone and peel off one layer of the surface of the natural stone like peeling a wig to create a sheet, but this method has the drawback of air bubbles forming on the surface of the peeled sheet. Also, when using natural stone to form decorative sheets or materials, undesired foreign matter may get mixed in, or undesired flows or patterns may occur, making it difficult to prepare sheets with the desired design in the desired quantity. In contrast, with the decorative sheet 1 of the first embodiment, it is possible to prevent the occurrence of air bubbles, and it is also possible to prepare sheets having the desired design in the desired quantity.

[0028] (2) The aggregate layer 3, the printed pattern layer 4, and the surface protective layer 5 are embossed by pressing. As a result, by forming embossments 6 in the aggregate layer 3, the printed pattern layer 4, and the surface protection layer 5, a concave-convex pattern can be formed on the decorative sheet 1, which makes it possible to impart a design feel similar to that of natural stone to the surface of the decorative sheet 1, thereby improving the design of the decorative sheet 1. Furthermore, by embossing using an embossing die made by molding natural stone as a prototype, it is possible to impart a design similar to that of natural stone to the surface of the decorative sheet 1.

[0029] (3) The glass transition point of the acrylic resin is within the range of -40°C or higher and 10°C or lower. As a result, by setting the glass transition point of the acrylic resin to -40°C or higher, it is possible to suppress a decrease in the adhesion of the print pattern layer 4 over time, compared to when the glass transition point of the acrylic resin is less than -40°C. In addition, by setting the glass transition point of the acrylic resin to 10°C or lower, it is possible to improve the ability of the decorative sheet 1 to conform to a curved surface, compared to when the glass transition point of the acrylic resin is more than 10°C.

[0030] (4) The surface protective layer 5 is formed mainly from acrylic, fluorine, silicone, or a mixture or copolymer of at least two of acrylic, fluorine, and silicone. As a result, it is possible to impart weather resistance to the surface protective layer 5.

[0031] (5) The thickness of the surface protection layer 5 is within the range of 3 μm to 10 μm. As a result, by making the thickness of the surface protective layer 5 3 μm or more, it is possible to impart sufficient scratch resistance to the surface protective layer 5, compared to a case in which the thickness of the surface protective layer 5 is less than 3 μm. In addition, by making the thickness of the surface protective layer 5 10 μm or less, it is possible to improve the ability of the decorative sheet 1 to conform to a curved surface, compared to a case in which the thickness of the surface protective layer 5 is more than 10 μm.

[0032] (6) At least one of the components contained in the inorganic filler is a hydrate. As a result, by using a hydrate as a component of the inorganic filler, even if the decorative sheet 1 is burned, the heat generated during combustion generates moisture, making it possible to reduce the amount of heat generated.

[0033] (7) The print pattern layer 4 is formed using an epoxy resin as a main component, and contains an inorganic pigment whose mixing ratio with respect to 100% by mass of the epoxy resin is 15% by mass or less. As a result, by forming the print pattern layer 4 so as to contain an inorganic pigment, it is possible to impart to the decorative sheet 1 a level of weather resistance which enables it to be used outdoors.

[0034] (8) The pattern formed by printing on the printed pattern layer 4 is formed from six or more different patterns created based on image data formed using patterns of natural stone materials. As a result, it becomes difficult for the viewer to notice that the same pattern exists in the pattern formed in the printed pattern layer 4, so that when the decorative sheet 1 is applied, the decorative state with a natural design is achieved, and it is possible to give a more natural design feeling.

[0035] (9) The print pattern layer 4 is formed by inkjet printing. As a result, it becomes difficult for the viewer to notice that the same pattern exists in the pattern formed in the printed pattern layer 4, so that when the decorative sheet 1 is applied, the decorative state with a natural design is achieved, and it is possible to give a more natural design feeling.

[0036] The decorative material 10 of the first embodiment can achieve the effects described below. (10) The device comprises a substrate 7 and a decorative sheet 1 laminated on at least one surface of the substrate 7. As a result, it is possible to provide a decorative material 10 that is capable of preventing deterioration of the design.

[0037] <Modification of the first embodiment> (1) In the first embodiment, the pattern formed by printing on the printed pattern layer 4 is configured to be formed from six or more different patterns created based on image data formed using a pattern of natural stone material, but this is not limited to this. That is, for example, as shown in Fig. 3, the pattern formed by printing on the printed pattern layer 4 may be configured to be formed from four different patterns created based on image data formed using a pattern of natural stone material. Therefore, the pattern formed by printing on the printed pattern layer 4 may be configured to be formed from at least three different patterns created based on image data formed using a pattern of natural stone material. Specifically, the design shown in FIG. 3 is formed from four different patterns (P1, P2, P3, P4) created based on image data formed using patterns of natural stone. Even with this configuration, it is difficult for a viewer to notice that the same pattern exists in the pattern formed in the printed pattern layer 4, so when the decorative sheet 1 is applied, the decorative state with a natural design is achieved, making it possible to impart a more natural design feel.

[0038] (2) In the first embodiment, the decorative sheet 1 has an embossed structure 7, but this is not limiting. For example, as shown in Fig. 4, the decorative sheet 1 may have no embossed structure. EXAMPLES

[0039] With reference to the first embodiment, the decorative sheets of Examples 1 to 12, the decorative sheets of Comparative Examples 1 and 2, and the decorative sheet of a reference example will be described below.

[0040] Example 1 The base layer has a basis weight of 48 g / m 2 [] was used to form the glass nonwoven fabric. The aggregate layer was formed by adding inorganic filler to acrylic resin (acrylic emulsion) with a glass transition point of 60°C, so that the weight ratio of solids when dry was 10:90. Note that the higher the glass transition point number, the lower the fluidity and the greater the hardness. Conversely, the lower the number, the higher the fluidity and the greater the flexibility. The inorganic filler used was calcium carbonate (CaCO3) with a particle size distribution in the range of 100 μm to 500 μm. The particle size distribution of calcium carbonate was determined by sieving and using particles that passed through the 500 μm sieve but did not pass through the 100 μm sieve. The printed pattern layer was formed by uniformly applying the aggregate layer to the base layer and then drying it to form a sheet with a thickness of 2.0 mm. The surface of the sheet (aggregate layer) was then printed using organic pigments by gravure offset printing. The pattern formed on the print pattern layer was formed using four different patterns (see FIG. 2). The surface protection layer was formed using acrylic resin to a thickness of 15 μm. Furthermore, the surface protective layer contains silica in a mixing ratio of 50 mass% relative to 100 mass% of the acrylic resin, which is the main component. In this manner, the decorative sheet of Example 1 was formed.

[0041] Example 2 The decorative sheet of Example 2 was formed in the same manner as in Example 1, except that after the aggregate layer was applied to the base layer, the aggregate layer was embossed using a silicone embossing mold before drying.

[0042] Example 3 A decorative sheet of Example 3 was formed in the same manner as in Example 1, except that the aggregate layer was formed using an acrylic resin with a glass transition point of -7°C.

[0043] Example 4 A decorative sheet of Example 4 was formed in the same manner as in Example 1, except that the aggregate layer was formed using an acrylic resin with a glass transition point of -62°C.

[0044] Example 5 A decorative sheet of Example 5 was formed in the same manner as in Example 1, except that the thickness of the surface protective layer was set to 2 μm.

[0045] Example 6 A decorative sheet of Example 6 was formed in the same manner as in Example 1, except that the thickness of the surface protective layer was set to 3 μm.

[0046] Example 7 A decorative sheet of Example 7 was formed in the same manner as in Example 1, except that the thickness of the surface protective layer was set to 5 μm.

[0047] Example 8 A decorative sheet of Example 8 was formed in the same manner as in Example 1, except that the thickness of the surface protective layer was set to 10 μm.

[0048] Example 9 The decorative sheet of Example 9 was formed in the same manner as in Example 1, except that calcium carbonate (CaCO3) with a particle size distribution in the range of 50 [μm] to 500 [μm] and aluminum hydroxide (Al(OH)3) with a particle size distribution in the range of 50 [μm] to 500 [μm] were used as the inorganic filler, and calcium carbonate and aluminum hydroxide were added to the acrylic resin so that the weight ratio of the solids when dried was 10:45:45. Note that the particle size distribution of the aluminum hydroxide was set by a sieving method in the same way as for the particle size distribution of calcium carbonate, using particles that passed through the 50 [μm] opening but did not pass through the 500 [μm] opening.

[0049] Example 10 A decorative sheet of Example 10 was formed in the same manner as in Example 1, except that an organic pigment was used to form the print pattern layer.

[0050] Example 11 A decorative sheet of Example 11 was formed in the same manner as in Example 1, except that the pattern formed on the print pattern layer was formed using six different patterns (see FIG. 3).

[0051] Example 12 A decorative sheet of Example 12 was formed in the same manner as in Example 1, except that the print pattern layer was formed by inkjet printing.

[0052] Comparative Example 1 A decorative sheet for Comparative Example 1 was formed in the same manner as in Example 1, except that calcium carbonate with a particle size distribution in the range of 1 μm to 10 μm was used as the inorganic filler.

[0053] Comparative Example 2 A decorative sheet for Comparative Example 2 was formed in the same manner as in Example 1, except that calcium carbonate with a particle size distribution in the range of more than 500 [μm] and not more than 1000 [μm] was used as the inorganic filler.

[0054] (Reference example) The decorative sheet of the reference example is a decorative sheet formed using cut natural stone material.

[0055] (Performance evaluation, evaluation results) The decorative sheets of Examples 1 to 12, Comparative Examples 1 and 2, and Reference Example were each evaluated for design, conformability to curved surfaces, and surface kurtosis (Sku). In addition, gloss value, ink adhesion, weather resistance, scratch resistance, fire resistance, and printability were evaluated. The evaluation results are shown in Tables 1 and 2. The evaluation methods used were as described below.

[0056] <Design> The design was evaluated based on a sensory evaluation and on the sense of incongruity caused by overlapping patterns (the sense of incongruity caused by the same pattern appearing consecutively). The design was evaluated by a sensory panel of 10 viewers. If 8 or more people thought the design and texture were good, the product was rated as "◎." If 5 or more people thought the design and texture were good, the product was rated as "〇." In addition, if less than 5 people thought the design and texture were good, the product was rated as "△." The ideal design evaluation based on sensory evaluation is "A".

[0057] Design quality based on the sense of incongruity of overlapping patterns was evaluated by asking 10 viewers for their opinions. If eight or more people answered that it did not feel strange at all that the same pattern continued when the decorative sheet was applied to a wall, it was rated as "◎". If five or more people answered that it did not feel strange at all, it was rated as "〇". If less than five people answered that it did not feel strange at all, it was rated as "△". In addition, the ideal evaluation of design in terms of the sense of incongruity of pattern overlap is one in which 10 people answered that they do not feel any incongruity at all due to the same pattern being repeated.

[0058] <Ability to conform to curved surfaces> The ability to conform to curved surfaces (R-curved surfaces) was evaluated using the diameter of the sheet at which no cracks or rebound occurred when the decorative sheet was applied to curved surfaces of Φ400, Φ300, Φ200, and Φ100 at a temperature of 25°C. In addition, the adhesive used to apply the decorative sheet to the curved surface was "EFREC STYLE ONE," a modified silicone adhesive from Konishi Co., Ltd.

[0059] In addition, the conformability to curved surfaces shown in the table indicates that the smaller the number, the more easily the decorative sheet can be applied to curved surfaces with greater curvature. The ideal evaluation of conformability to a curved surface is when the decorative sheet has a diameter of "Φ200" and no cracks or rebounding occurs.

[0060] <Surface Kurtosis (Sku)> Surface kurtosis (Sku) was measured using a laser microscope equipped with a 5x objective lens manufactured by Olympus Corporation under measurement conditions of a cutoff value λc of 250 μm. The ideal rating for surface kurtosis (Sku) is within the range of 3.0 or more and 30 or less.

[0061] <Gloss value> The gloss value was measured using a gloss meter manufactured by Horiba Ltd., with the measurement angle set to 60°. The ideal evaluation of the gloss value would be the same as that of the reference example, that is, the same as that of natural stone.

[0062] <Ink adhesion> For the ink adhesion, first, a sample was taken from the decorative sheet to be evaluated, and 25 grids were formed on the surface of the sample by cutting 6 lines each at 2 mm intervals using a cutter. Next, the edge of a piece of Cellophane Tape (registered trademark) that had been firmly pressed onto the grids was quickly peeled off at an angle of 45°, and the degree of ink peeling from the grids was visually confirmed. The result was evaluated as the number of grids from which the ink had peeled off divided by 25. The ideal rating for ink adhesion is 0 / 25.

[0063] <Weather resistance> Weather resistance was evaluated by first taking samples from the decorative sheet to be evaluated, and testing was performed by leaving the samples for 1000H, 2000H, 3000H, and 4000H using a Sunshine Weather Meter manufactured by Suga Test Instruments Co., Ltd., in a mode in which it rains for the first 18 minutes of the 120 minutes. The samples were then checked after the test, and the evaluation was performed using the time at which no fading was observed. The ideal weather resistance rating is 4000H.

[0064] <Scratch resistance> For scratch resistance, first, a sample is taken from the decorative sheet to be evaluated, and the tip of a Mitsubishi Pencil Co., Ltd. "Hi-Uni" pencil is used to flatten the sample with abrasive paper. A load of 750 g is then applied to the pencil, which is pressed against the sample's surface over a distance of 7 mm at a speed of 0.8 mm / s, and the hardness (pencil hardness) of the hardest pencil that does not leave a scratch on the sample's surface is measured. The ideal rating for scratch resistance is 4H.

[0065] <Fire resistance> Fire resistance is evaluated by first applying a sealer for application to a standard gypsum board (non-combustible or semi-non-combustible) and then drying it. Next, application glue is applied, and then a test piece of the decorative sheet to be evaluated is attached. It is then dried in a desiccator for at least 48 hours. Furthermore, the test piece is heated with a cone heater, and the generated gas is ignited and burned with a spark ignition device. The oxygen concentration of the burned gas is measured, and the total heat generated during combustion (total heat generated during combustion (MJ / m 2 The total heat generated during combustion (MJ / m 2 ) is 8.0(MJ / m 2 ) or less, it falls within the range of non-combustible materials that are fire-resistant certified. The ideal fire resistance rating is 8.0 (MJ / m 2 )The following evaluation is given.

[0066] <Printability> Printability was evaluated as "◎" when printability was possible under a wide range of printing conditions, and "◯" when printability was possible under limited conditions. The ideal evaluation of printability is a rating of "A".

[0067] [Table 1]

[0068] [Table 2]

[0069] As a result of evaluating various performances using the above-mentioned methods, the decorative sheets of Examples 1 to 12 showed excellent performances for each evaluation item. On the other hand, the decorative sheets of Comparative Examples 1 and 2 were unable to show excellent performances, particularly with respect to surface kurtosis (Sku) and gloss value.

[0070] The present technology can be configured as follows. (1) A base layer; An aggregate layer laminated on one surface of the base material layer; a print pattern layer laminated on a surface of the aggregate layer opposite to the surface facing the base material layer; a surface protection layer laminated on a surface of the print pattern layer opposite to the surface facing the aggregate layer, The aggregate layer includes a mixture of an acrylic resin having a mixing ratio of 5% by mass or more and 15% by mass or less with respect to 100% by mass of the aggregate layer, and an inorganic filler having a mixing ratio of 85% by mass or more and 95% by mass or less with respect to 100% by mass of the aggregate layer, The thickness of the aggregate layer is within the range of 0.2 mm to 4.0 mm, The decorative sheet contains an inorganic filler having a particle size distribution within the range of 50 μm or more and 500 μm or less. (2) The decorative sheet according to (1) above, wherein the surface of the surface protective layer opposite to the surface facing the print pattern layer has a surface kurtosis (Sku) in the range of 3.0 or more and 30 or less. (3) The decorative sheet according to (1) or (2) above, wherein the aggregate layer, the print pattern layer, and the surface protection layer are embossed by pressing a mold. (4) The decorative sheet according to any one of (1) to (3) above, wherein the glass transition point of the acrylic resin is within the range of -40°C or higher and 10°C or lower. (5) The decorative sheet according to any one of (1) to (4), wherein the surface protective layer is formed mainly from acrylic, fluorine, silicone, or a mixture or copolymer of at least two of the acrylic, fluorine, and silicone. (6) The decorative sheet according to any one of (1) to (5) above, wherein the thickness of the surface protective layer is within the range of 3 μm to 10 μm. (7) A decorative sheet according to any one of (1) to (6) above, wherein at least one of the components contained in the inorganic filler is a hydrate. (8) The decorative sheet according to any one of (1) to (7) above, wherein the print pattern layer is formed using a pigment containing an inorganic pigment as a main component. (9) A pattern is formed on the print pattern layer by printing, A decorative sheet according to any one of (1) to (8) above, wherein the pattern is formed from at least three different patterns created based on image data using patterns of natural stone. (10) The decorative sheet according to (9) above, wherein the pattern is formed from six or more different patterns created based on the image data. (11) The decorative sheet according to any one of (1) to (10) above, wherein the print pattern layer is formed by inkjet printing. (12) A substrate; A decorative material comprising: a decorative sheet according to any one of (1) to (11) above, laminated on at least one surface of the substrate. [Explanation of symbols]

[0071] 1...decorative sheet, 2...base material layer, 3...aggregate layer, 4...printed pattern layer, 5...surface protection layer, 6...embossment, 7...substrate, 10...decorative material

Claims

1. A base layer; An aggregate layer laminated on one surface of the base material layer; a print pattern layer laminated on a surface of the aggregate layer opposite to the surface facing the base material layer; a surface protection layer laminated on a surface of the print pattern layer opposite to the surface facing the aggregate layer, The aggregate layer includes a mixture of an acrylic resin having a mixing ratio of 5% by mass or more and 15% by mass or less with respect to 100% by mass of the aggregate layer, and an inorganic filler having a mixing ratio of 85% by mass or more and 95% by mass or less with respect to 100% by mass of the aggregate layer, The thickness of the aggregate layer is within a range of 0.2 mm to 4.0 mm, The inorganic filler includes a filler having a particle size distribution in the range of 50 μm or more and 500 μm or less, A decorative sheet in which the surface of the surface protective layer opposite to the surface facing the print pattern layer has a surface kurtosis (Sku) in the range of 3.0 or more and 30 or less.

2. 2. The decorative sheet according to claim 1, wherein the aggregate layer, the print pattern layer and the surface protection layer are embossed by pressing a mold.

3. 2. A decorative sheet according to claim 1, wherein the glass transition point of the acrylic resin is within the range of -40°C or higher and 10°C or lower.

4. 2. The decorative sheet according to claim 1, wherein the surface protective layer is formed mainly from acrylic, fluorine, silicone, or a mixture or copolymer of at least two of the acrylic, fluorine, and silicone.

5. 2. The decorative sheet according to claim 1, wherein the thickness of the surface protective layer is within the range of 3 [mu]m to 10 [mu]m.

6. 2. The decorative sheet according to claim 1, wherein at least one of the components contained in said inorganic filler is a hydrate.

7. 2. The decorative sheet according to claim 1, wherein the print pattern layer is formed from an epoxy resin as a main component, and contains an inorganic pigment in a mixing ratio of 15% by mass or less with respect to 100% by mass of the epoxy resin.

8. A pattern is formed on the print pattern layer by printing, 2. The decorative sheet according to claim 1, wherein said pattern is formed from at least three different patterns created based on image data using patterns of natural stone.

9. 9. A decorative sheet according to claim 8, wherein said pattern is formed from six or more different patterns created based on said image data.

10. 2. The decorative sheet according to claim 1, wherein said printed pattern layer is formed by ink-jet printing.

11. A substrate; A decorative material comprising: a decorative sheet according to any one of claims 1 to 10 laminated on at least one surface of the substrate.

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