Decorative sheet, method for manufacturing decorative sheet, and decorative material

Abstract

To provide a decorative sheet having excellent touch and design while being equipped with excellent matte property.SOLUTION: A decorative sheet 10 has a substrate layer 1, a design layer 2, a resin layer 3 and a matte layer 4 in this order in a thickness direction, where the matte layer has a wrinkle structure on a surface of the opposite side of the resin layer, the resin layer has a plurality of recesses on a surface of the matte layer side, the matte layer has a recessed shape following the recesses of the resin layer, and in the case where a region overlapping the recesses when the decorative sheet is seen from a thickness direction is a first region, and a region not overlapping the recesses is a second region, a filling part containing a coloring agent between the resin layer and the matte layer is arranged in the first region.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] As a method for producing matte articles, a method for forming a wrinkled structure on the surface of a resin using light such as excimer light has been proposed. For example, Patent Document 1 discloses a method for producing a decorative sheet, which includes the steps of preparing a substrate, applying a specific paint to the surface of the substrate to form a coating film on the surface of the substrate, irradiating the coating film with excimer light, and irradiating the coating film with ultraviolet light to harden the coating film, thereby forming a surface layer on the surface of the substrate. Through these steps, numerous wrinkles are formed in the surface layer of the decorative sheet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-24102 Summary of the Invention [Problem to be solved by the invention]

[0004] By forming a wrinkled structure on the surface of the resin, it is possible to impart a good matte finish (low gloss) to the decorative sheet. On the other hand, from the viewpoint of improving the functionality of the decorative sheet, not only a good matte finish but also a good feel and a good design are sometimes required of the decorative sheet at the same time.

[0005] The present disclosure has been made in view of the above problems, and has as its main object to provide a decorative sheet that has good matte properties, a good feel, and good design properties. [Means for solving the problem]

[0006] The present disclosure provides a decorative sheet having a base layer, a design layer, a resin layer, and a matte layer, in that order in the thickness direction, wherein the matte layer has a wrinkled structure on the surface opposite to the resin layer, the resin layer has a plurality of recesses on the surface facing the matte layer, and the matte layer has recessed shapes that follow the recesses in the resin layer, and when the decorative sheet is viewed in the thickness direction, an area that overlaps with the recesses is defined as a first area, and an area that does not overlap with the recesses is defined as a second area, in the first area, a filling section containing a colorant is disposed between the resin layer and the matte layer.

[0007] The present disclosure provides a decorative sheet having a resin layer, a design layer, and a matte layer, in that order in the thickness direction, wherein the matte layer has a wrinkled structure on the side opposite the resin layer, the resin layer has a plurality of recesses on the side facing the matte layer, the design layer and the matte layer each have recessed shapes that follow the recesses in the resin layer, and when the decorative sheet is viewed in the thickness direction, the area that overlaps with the recesses is defined as a first area, and the area that does not overlap with the recesses is defined as a second area, in the first area, a filling section containing a colorant is disposed between the resin layer and the matte layer.

[0008] In the present disclosure, the method for manufacturing the decorative sheet described above includes a laminate preparation step of preparing a laminate having the base layer, the design layer, and the resin layer in this order in the thickness direction; a recess formation step of forming the plurality of recesses on the surface of the resin layer in the laminate opposite the design layer; a filling portion formation step of filling at least some of the recesses with ink for forming the filling portions and drying the ink to form the filling portions; and a matte layer formation step of forming the matte layer on the surface of the resin layer opposite the design layer and the surface of the filling portion opposite the design layer after the filling portion formation step. and the matte layer forming step comprises a wrinkle structure forming process in which a curable resin composition for forming the matte layer is applied to form a coating layer, and the coating layer is cured by an irradiation process with ionizing radiation to form the wrinkle structure, and the irradiation process with ionizing radiation comprises (1) a first curing process by irradiation with light having a wavelength of more than 320 nm and not more than 400 nm, (2) a second curing process by irradiation with light having a wavelength of 100 nm or more and less than 200 nm, and (3) a third curing process by irradiation with at least one of electron beam irradiation and light having a wavelength of 200 nm or more and not more than 400 nm, in this order.

[0009] In the present disclosure, there is provided a method for manufacturing the decorative sheet described above, comprising: a recess forming step of forming the plurality of recesses on one side of the resin layer; a design layer forming step of forming the design layer on the one side of the resin layer after the recess forming step; a filling portion forming step of filling at least a portion of the recess with ink for forming the filling portion and drying to form the filling portion; and a matte layer forming step of forming the matte layer on the side of the design layer opposite the resin layer and the side of the filling portion opposite the resin layer after the filling portion forming step, The present invention provides a method for producing a decorative sheet, wherein the matte layer forming step comprises a wrinkle structure forming process in which a curable resin composition for forming the matte layer is applied to form a coating layer, and the coating layer is cured by irradiation with ionizing radiation to form the wrinkle structure, and the irradiation process with ionizing radiation comprises (1) a first curing process by irradiation with light having a wavelength of more than 320 nm and not more than 400 nm, (2) a second curing process by irradiation with light having a wavelength of 100 nm or more and less than 200 nm, and (3) a third curing process by irradiation with at least one of electron beam irradiation and light having a wavelength of 200 nm or more and not more than 400 nm, in this order.

[0010] The present disclosure provides a decorative material having an adherend and the decorative sheet described above. [Effects of the Invention]

[0011] The present disclosure has the effect of providing a decorative sheet that has good matte properties, a good feel, and a good design. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic cross-sectional view illustrating a decorative sheet according to the present disclosure. [Figure 2] 1 is a microscopic image illustrating a wrinkle structure according to the present disclosure. [Figure 3] 2 is a schematic cross-sectional view illustrating a resin layer and a recess in the present disclosure. FIG. [Figure 4] 1 is a schematic plan view illustrating a decorative sheet according to the present disclosure. [Figure 5] FIG. 2 is a schematic diagram illustrating the provision of a difference in optical properties between adjacent first and second regions. [Figure 6] 1 is a schematic cross-sectional view illustrating a decorative sheet according to the present disclosure. [Figure 7] 1 is a schematic cross-sectional view illustrating a decorative sheet according to the present disclosure. [Figure 8] 1 is a schematic cross-sectional view illustrating a decorative sheet according to the present disclosure. [Figure 9] 1 is a schematic cross-sectional view illustrating a method for producing a decorative sheet according to the present disclosure. [Figure 10] 1 is a schematic cross-sectional view illustrating a method for producing a decorative sheet according to the present disclosure. [Figure 11] 1 is a schematic cross-sectional view illustrating a decorative material according to the present disclosure. [Figure 12] 1 is a schematic cross-sectional view illustrating a decorative material according to the present disclosure. [Figure 13] 10 is a graph showing the relationship between color difference ΔE and RSm ratio in a reference example. DETAILED DESCRIPTION OF THE INVENTION

[0013] Below, embodiments will be described with reference to the drawings etc. However, the present disclosure can be implemented in many different forms and is not limited to the description of the embodiments exemplified below. Furthermore, to clarify the explanation, the drawings may show the width, thickness, and shape of each part schematically compared to the actual form, but this is merely an example and should not be construed as limiting.

[0014] In this specification, when describing a mode in which another component is placed on a certain component, the term "above" or "below" is used, unless otherwise specified, to include both a case in which another component is placed directly above or below a certain component so as to be in contact with the component, and a case in which another component is placed above or below a certain component with another component interposed therebetween. Also, in this specification, when describing a mode in which another component is placed on the surface of a certain component, the term "on the surface" or "on the surface side" is used, unless otherwise specified, to include both a case in which another component is placed directly above or below a certain component so as to be in contact with the component, and a case in which another component is placed above or below a certain component with another component interposed therebetween.

[0015] In addition, in this specification, the terms "plate," "sheet," and "film" are not distinguished from one another solely based on differences in name. For example, a "sheet" also includes a member called a "plate" or a "film."

[0016] The decorative sheet, the method for manufacturing the decorative sheet, and the decorative material according to the present disclosure will be described in detail below.

[0017] A. Decorative sheet The decorative sheet of the present disclosure has two embodiments, which will be described below as a first embodiment and a second embodiment.

[0018] A-1. First embodiment Fig. 1 is a schematic cross-sectional view illustrating a decorative sheet according to a first embodiment. The decorative sheet 10 shown in Fig. 1 is made up of a base layer 1, a design layer 2, a resin layer 3, and a matte layer 4, which are arranged in a thickness direction D T In this example, the matte layer 4 has a wrinkle structure w on the surface S1 (also referred to as the first surface) opposite to the resin layer 3. As shown in Fig. 2, the wrinkle structure w is usually a structure having irregular wrinkles. The irregular wrinkles shown in Fig. 2 have a convex structure w1 formed by a plurality of protrusions and a concave structure w2 formed by being surrounded by the plurality of protrusions.

[0019] 1, the resin layer 3 has a plurality of recesses 31 on the surface on the matte layer 4 side. For convenience, only a single recess 31 is shown in FIG. 1. The matte layer 4 has a recessed shape that follows the recesses 31 of the resin layer 3. The decorative sheet 10 is also formed in a thickness direction D T From this perspective, if the area overlapping with the recess 31 is defined as the first region R1 and the area not overlapping with the recess 31 is defined as the second region R2, in the first region R1, a filling portion 5 containing a colorant is arranged between the resin layer 3 and the matte layer 4.

[0020] According to the first embodiment, the matte layer has a wrinkled structure, resulting in a decorative sheet with good matte properties. Furthermore, the matte layer's wrinkled structure provides a silky feel. Furthermore, in addition to having a wrinkled structure, the matte layer has a concave shape that follows the concave shape of the resin layer, providing a distinct feel that conforms to the concave shape. Furthermore, the decorative sheet has a design layer and a filling portion that fills the concave portion of the resin layer. Because the design layer and the filling portion are positioned differently in the thickness direction, a three-dimensional design can be expressed when the decorative sheet is viewed from the thickness direction, resulting in good design properties.

[0021] 1. Resin layer and filling section As shown in FIG. 1, the decorative sheet 10 has a resin layer 3. The resin layer 3 has recesses 31 on the surface facing the matte layer 4. The resin layer contains a resin. Examples of resins that constitute the resin layer include polyolefin resins, polyester resins, polycarbonate resins, acrylonitrile-butadiene-styrene resins (hereinafter also referred to as "ABS resins"), acrylic resins, and vinyl chloride resins. Furthermore, the thermoplastic resins used in the substrate layer, which will be described later, may also be used as the resin that constitutes the resin layer. The resins may be used alone or in combination of two or more types.

[0022] The resin layer may contain additives as needed. Examples of additives include colorants, UV absorbers, light stabilizers, and other weather-resistant agents. The resin layer may be colorless and transparent, colored and transparent, translucent, or opaque. The thickness of the resin layer is not particularly limited, but may be, for example, 20 μm to 150 μm, 40 μm to 120 μm, or 60 μm to 100 μm.

[0023] The resin layer has a recess on the surface facing the matte layer. The recess in the resin layer is preferably arranged according to the pattern of the pattern layer (design layer). For example, when the design layer has a pattern layer with a wood grain pattern, the recess may be arranged so as to overlap with the vessels of the wood grain pattern in a planar view. The recess may also be arranged so as to overlap with the latewood portion of the annual rings of the wood grain pattern in a planar view. The recess may also be arranged so as to overlap with the knots of the wood grain pattern in a planar view.

[0024] The cross-sectional shape of the recess is not particularly limited. As shown in Fig. 3(a), the cross-sectional shape of the recess 31 may be a rectangle such as a trapezoid. As shown in Fig. 3(b), the cross-sectional shape of the recess 31 may be a triangle, or as shown in Fig. 3(c), the cross-sectional shape of the recess 31 may be a shape with curvature at the corners (for example, a U-shape).

[0025] The planar shape of the recesses is not particularly limited, but examples thereof include lines and dots. Linear recesses usually extend in a first direction. Examples of patterns formed by multiple recesses include wood grain vessel grooves, stone slab surfaces, cloth surface textures, matte finishes, sand grains, hairlines, and linear grooves.

[0026] As shown in FIGS. 3(a) to 3(c), the depth of the recess 31 is D 31 Depth D 31 is the thickness direction D T The depth D is the length of the recess 31 at 31 is, for example, 10 μm or more, may be 15 μm or more, or may be 20 μm or more. 31The depth D is, for example, 100 μm or less, may be 90 μm or less, or may be 80 μm or less. 31 is the average value of measurements taken at any 10 points.

[0027] As shown in FIGS. 3(a) to 3(c), the width of the recess 31 is W 31 Width W 31 is the thickness direction D T In particular, when the shape of the recess 31 in a plan view is linear, that is, when the recess 31 has a shape extending in the first direction, the width W 31 The width W is the length of the recess 31 in the second direction perpendicular to the first direction. 31 is, for example, 200 μm or more, may be 250 μm or more, or may be 300 μm or more. 31 The width W is, for example, 1000 μm or less, may be 800 μm or less, or may be 600 μm or less. 31 is the average value of measurements taken at any 10 points.

[0028] As shown in FIG. 1, the decorative sheet 10 is T When viewed from the above, the region overlapping with the recess 31 is defined as the first region R1, and the region not overlapping with the recess 31 is defined as the second region R2. In the first region R1, a filling portion 5 containing a colorant is disposed between the resin layer 3 and the matte layer 4. That is, the filling portion 5 is disposed between the resin layer 3 and the matte layer 4, and is disposed so as to fill the recess 31. In addition, when the decorative sheet 10 is oriented in the thickness direction D T When viewed from the above perspective, it is preferable that the filling section 5 is arranged in a pattern corresponding to at least a portion of the plurality of recesses 31, rather than over the entire surface of the resin layer 3. Furthermore, the filling section has a bottom portion arranged at the bottom of the recess and a wall portion formed continuously from the bottom portion and arranged on the wall of the recess, and the thickness of the bottom portion may be greater than the thickness of the wall portion. A filling section having such a structure can be obtained, for example, by performing wiping, which will be described later.

[0029] The filling portion contains a colorant. Examples of colorants include inorganic pigments such as white pigments such as titanium white, iron black, yellow lead, titanium yellow, red iron oxide, cadmium red, ultramarine blue, and cobalt blue; organic pigments or dyes such as quinacridone red, isoindolinone yellow, phthalocyanine blue, nickel-azo complexes, azomethine azo-based black pigments, and perylene-based black pigments; metal pigments such as aluminum and brass, which are flaky flakes; and pearlescent pigments such as titanium dioxide-coated mica and basic lead carbonate, which are flaky flakes. The filling portion may further contain additives in addition to the colorant. Examples of additives include fillers such as organic fillers and inorganic fillers; and weathering agents such as ultraviolet absorbers and light stabilizers.

[0030] 2.Matte layer The matte layer has a wrinkled structure on the surface (first surface) opposite to the resin layer, and also has recesses that correspond to the recesses of the resin layer.

[0031] (1) Shape of wrinkle structure The wrinkle structure is usually a structure having irregular wrinkles. The irregular wrinkles preferably have a convex structure (convex structure portion) formed by a plurality of protrusions and a concave structure (concave structure portion) formed by being surrounded by a plurality of protrusions. In addition, the protrusions preferably have linear protrusions.

[0032] In this specification, "linear protrusions" means that the ratio of the length to the width of the protrusions (length / width) is 3 or more, preferably 5 or more, and more preferably 10 or more. The method for determining the length and width of the protrusions is as described below. Hereinafter, linear protrusions may be referred to as linear protrusions.

[0033] A specific embodiment of the wrinkle structure is, for example, the embodiment shown in Fig. 2. Fig. 2 also shows that the first surface of the matte layer 4 has irregular wrinkles, that the irregular wrinkles have a convex structure w1 formed by a plurality of curved filamentary protrusions and a concave structure w2 formed by being surrounded by the plurality of protrusions, and that at least a portion of the curved convex structures w1 are each formed by meandering filamentary protrusions, and that a meandering concave structure w2 is formed so as to be surrounded by the meandering filamentary protrusions.

[0034] Here, "curved" means that there is one or more portions where the extension direction of the continuous filamentary convex structure w1 is reversed from one side to the other in a planar view. Hereinafter, a portion where the extension direction of the continuous filamentary convex structure w1 is reversed from one side to the other may be referred to as an "inverted portion." An example of an inverted portion is, for example, a form having an inflection point when the filamentary convex structure w1 is approximated by a continuous curve when the width of the planar view shape is ignored (when the width is considered to be 0). Another example of an inverted portion is a form having a portion that is approximated by a V-shaped folded line or two sides sandwiching one vertex of a triangle when the filamentary convex structure w1 is approximated by a straight line when the width of the planar view shape is ignored.

[0035] Furthermore, "meandering" means that, in a plan view, there are two or more inverted portions, and when the filamentary convex structure w1 extends in its extension direction, the extension direction of the filamentary convex structure w1 alternately reverses at two adjacent inverted portions. For example, when the width of the filamentary convex structure w1 in a plan view is ignored and the filamentary convex structure w1 is approximated by a continuous curve, an example of such a form is one having a portion approximated by the Roman letter "S." Furthermore, when the width of the filamentary convex structure w1 in a plan view is ignored and the filamentary convex structure w1 is approximated by a straight line, an example of such a form is one having a portion approximated by the Roman letter "W."

[0036] In this specification, "irregular" means a structure that does not have a fixed rule, or that is not arranged according to a fixed rule, i.e., not so-called patterned. A typical example of a non-irregular structure (regular structure) is a structure in which a plurality of cylindrical unit lenses are arranged adjacent to each other in a direction perpendicular to their longitudinal direction, such as a so-called lenticular lens, and are arranged with a fixed periodicity in a specific direction. The irregular wrinkles that a wrinkle structure may have include the fact that the shape of a single protrusion itself is irregular, not formed according to a fixed rule such as periodicity; that a plurality of convex structures formed by a plurality of protrusions are irregular, not formed and arranged according to a fixed rule; and that a concave structure surrounded by such a plurality of protrusions is also irregular.

[0037] In the wrinkle structure, it is preferable that the shape of one protrusion (one convex structure) itself, the shape and arrangement of each of the multiple protrusions (multiple convex structures), or the shape of the concave structure surrounded by the multiple protrusions is irregular.

[0038] As described above, the surface of the matte layer has a wrinkled structure, as well as a convex and concave structure. The convex and concave structures are defined based on the median value of the height distribution in the wrinkled structure, with regions with heights exceeding this median value defined as convex structures and regions with heights equal to or less than this median value defined as concave structures. For example, by utilizing the density difference (i.e., brightness difference) of an image having a density that corresponds 1:1 to the surface height of the matte layer, the darkest portion of the density distribution image can be designated as gradation 255, and the lightest portion of the density distribution image can be designated as gradation 0. For gradations 0 to 255, binarization processing can be performed to classify gradations 0 to 127 as concave structures and gradations 128 to 255 as convex structures. In this case, the median density value for the median height is 127.

[0039] The concave structure may have an acute angle, a semicircular shape, a semielliptical shape, or a combination thereof in a cross-sectional view, while the convex structure may have a semicircular shape or a semielliptical shape in a cross-sectional view, although the width may vary.

[0040] The height of the convex structure (height of the protrusions) is, for example, 0.5 μm or more, and may be 1 μm or more. The height of the convex structure is, for example, 10 μm or less. The depth of the concave structure is, for example, 0.5 μm or more, and may be 1 μm or more. The depth of the concave structure is, for example, 10 μm or less. The distance from the top of the convex structure to the bottom of the concave structure (height difference between the convex structure and the concave structure) is, for example, 1 μm or more, and may be 2 μm or more. The distance is, for example, 20 μm or less, and may be 18 μm or less, or may be 16 μm or less.

[0041] Here, the dimensions of the convex structure are the average values ​​of 10 convex structures (protrusions) at 10 arbitrary locations (100 μm square area × 10 locations) on the surface of the matte layer, i.e., a total of 100 convex structures. The height of one convex structure (protrusion) is the average value of the heights of five arbitrary locations on one convex structure (protrusion). The dimensions of the concave structure are determined in the same way as the dimensions of the convex structure described above.

[0042] (2) Surface characteristics of wrinkle structure The wrinkle structure in the first region and the wrinkle structure in the second region preferably have the following surface properties: The surface properties of the wrinkle structure can be controlled by adjusting the type of material used in the matte layer, the thickness of the matte layer, and the conditions of the irradiation treatment described below.

[0043] (i) RSm (average length of curved elements) The RSm (average length of curved elements) of the wrinkle structure as defined in JIS B0601:2013 is, for example, 100 μm or less, or may be 70 μm or less, or may be 50 μm or less, while the RSm (average length of curved elements) is, for example, 20 μm or more, or may be 30 μm or more.

[0044] RSm (average length of curved elements) is a horizontal parameter of the profile curve and is the average length of the profile curve elements in a reference length. The smaller RSm, the more convex structures are included in the reference length. Therefore, a small RSm means that the peaks of the protrusions are densely present, resulting in a greater matte effect.

[0045] In this specification, the cutoff value for measuring RSm (average length of curved line elements) is 0.8 mm. Also, in this specification, RSm (average length of curved line elements) is the average value of measurements taken at any 10 points.

[0046] (ii) Ra (arithmetic mean roughness) The Ra (arithmetic mean roughness) of the wrinkle structure as defined in JIS B0601:2013 is, for example, 5.0 μm or less, and may be 2.5 μm or less. On the other hand, the Ra (arithmetic mean roughness) is, for example, 0.5 μm or more, and may be 1.0 μm or more.

[0047] Ra (arithmetic mean roughness) is one of the parameters in the height direction of a profile curve, and is the average difference in height from the average surface on a profile curve over a reference length. The smaller the Ra (arithmetic mean roughness) value, the smaller the difference in height of the convex structures in the wrinkle structure and the concave structures formed accordingly, and the tendency for the shape to become smoother and more uniform.

[0048] In this specification, the cutoff value for measuring Ra (arithmetic mean roughness) is 0.8 mm. Furthermore, in this specification, the Ra (arithmetic mean roughness) is the average value of measurements taken at any 10 points.

[0049] (iii) Rz (maximum height) The wrinkle structure has a maximum height Rz (maximum height) of, for example, 15.0 μm or less, or may be 10.0 μm or less, as specified in JIS B0601:2013. On the other hand, the maximum height Rz (maximum height) is, for example, 5.0 μm or more, or may be 6.0 μm or more.

[0050] As described above, Rz (maximum height) is one of the parameters of the peak and height of a profile curve, and is the sum of the height of the highest peak and the depth of the deepest valley in the profile curve over the reference length. The larger the Rz value, the more likely it is that a large (high) convex structure is present relative to the valley (concave structure), and this is an indicator that there is a tendency for a large number of such convex structures to be present.

[0051] In this specification, the cutoff value for measuring Rz (maximum height) is 0.8 mm. Furthermore, in this specification, the Rz (maximum height) is the average value of measurements taken at any 10 points.

[0052] (3) Wrinkle structure in the first and second regions As shown in Figure 1, the wrinkle structure w of the matte layer 4 in the first region R1 and the wrinkle structure w of the matte layer 4 in the second region R2 adjacent to the first region R1 may have different surface textures. In Figure 1, the wrinkles of the wrinkle structure w in the first region R1 are finer than the wrinkles of the wrinkle structure w in the second region R2 adjacent to the first region R1. By providing wrinkle structures with different surface textures, the range of design expression can be expanded.

[0053] For example, the recess 31 shown in FIG. 4(a) has a shape extending in the first direction D1. The recess 31 is arranged so as to overlap with the vessels (not shown) of the wood grain pattern in a plan view. As shown in FIGS. 4(b) and 4(c), the wrinkles of the wrinkle structure w in the first region R1 are finer than the wrinkles of the wrinkle structure w in the second region R2. Generally, the finer the wrinkles of the wrinkle structure, the lower the gloss. Furthermore, in real wood grain, the vessel portion has a relatively low gloss. Therefore, as shown in FIGS. 4(b) and 4(c), by making the wrinkles of the wrinkle structure w in the first region R1 finer than the wrinkles of the wrinkle structure w in the second region R2, the design (particularly the sense of authenticity) can be further improved.

[0054] The RSm in the wrinkle structure of the first region is defined as RSm1, and the RSm in the wrinkle structure of the second region is defined as RSm2. RSm1 may be larger, the same, or smaller than RSm2. "RSm1 and RSm2 are the same" means that the ratio of RSm2 to RSm1 (RSm2 / RSm1) is 0.9 to 1.1. RSm2 / RSm1 may be 1.2 to 1.5. On the other hand, RSm2 / RSm1 may be, for example, 2.5 to 2.0. RSm2 / RSm1 may be 0.8 to 0.6.

[0055] The Ra in the wrinkle structure of the first region is defined as Ra1, and the Ra in the wrinkle structure of the second region is defined as Ra2. Ra1 may be larger than, the same as, or smaller than Ra2. "Ra1 and Ra2 are the same" means that the ratio of Ra2 to Ra1 (Ra2 / Ra1) is 0.9 to 1.1. Ra2 / Ra1 may be 1.2 to 1.5. On the other hand, Ra2 / Ra1 may be, for example, 2.5 to 2.0. Furthermore, Ra2 / Ra1 may be 0.8 to 0.6.

[0056] The Rz in the wrinkle structure of the first region is defined as Rz1, and the Rz in the wrinkle structure of the second region is defined as Rz2. Rz1 may be larger, the same, or smaller than Rz2. "Rz1 and Rz2 are the same" means that the ratio of Rz2 to Rz1 (Rz2 / Rz1) is 0.9 to 1.1. Rz2 / Rz1 may be 1.2 to 1.5. On the other hand, Rz2 / Rz1 may be, for example, 2.5 to 2.0. Furthermore, Rz2 / Rz1 may be 0.8 to 0.6.

[0057] An example of a method for forming wrinkle structures with different surface properties in adjacent first and second regions is to provide a difference in optical properties between the adjacent first and second regions. By providing a difference in optical properties, wrinkle structures with different surface properties are formed in the adjacent first and second regions even if the same curing treatment is performed when the matte layer is produced (when the coating layer is cured to form the matte layer).

[0058] Methods for creating differences in optical properties include, for example, (i) a method utilizing differences in light reflectivity, (ii) a method utilizing differences in light diffusion, (iii) a method utilizing differences in light transmittance, and (iv) a method utilizing differences in light absorption. Furthermore, the first region typically has a filling portion formed therein, and may or may not have a design layer formed therein. On the other hand, the second region typically does not have a filling portion formed therein, but has a design layer formed therein. Therefore, by creating differences in the optical properties of the filling portion and the design layer, it is possible to form wrinkle structures in the adjacent first and second regions that have different surface properties.

[0059] (i) A method that utilizes the difference in light reflectivity Fig. 5(a) is a schematic diagram illustrating the difference in optical properties between adjacent first and second regions due to the difference in light reflectivity. For simplicity's sake, Fig. 5(a) depicts the filling portion and the design layer as a base P, and the first region R1 and the second region R2 as black and white patterns. This also applies to Figs. 5(b) to (d).

[0060] In FIG. 5(a), the first region R1 and the second region R2 have different light reflectivities. Light incident from the coating layer 40 side is reflected relatively more by the surface of the white pattern (first region R1). The reflected light is again absorbed by the coating layer 40, resulting in relatively more curing. On the other hand, light incident from the coating layer 40 side is reflected relatively less by the surface of the black pattern (second region R2). The reflected light is again absorbed by the coating layer 40, resulting in relatively less curing. This difference in curing is particularly noticeable in the first curing treatment described below. As a result, a matte layer with a fine wrinkle structure is formed in the white pattern (first region R1), and a matte layer with a coarse wrinkle structure is formed in the black pattern (second region R2).

[0061] When the first region R1 and the second region R2 in FIG. 5(a) are irradiated with light having a wavelength of more than 320 nm and not more than 400 nm at an intensity I from the coating layer 40 side for a predetermined time, the reflectance in the first region R1 is ρ r (%), and the reflectance in the second region R2 is ρ r’ (%), the integrated light amount I absorbed by the coating layer 40 in the first region R1 t1 and the integrated light amount I absorbed by the coating layer 40 in the second region R2. t2 Ratio to (I t1 / I t2 ) becomes: I t1 / I t2 =((I+(Iρ r / 100)) / ((I+(Iρ r’ / 100))=(1+(ρ r / 100)) / (1+(ρ r’ / 100))

[0062] Integrated light intensity ratio I t1 / I t2 is preferably 1.1 or more. That is, the reflectance ρ r , and the reflectance ρ of the second region R2 for the above wavelength light. r’ It is preferable that each of the following conditions be satisfied: (1+(ρ r / 100)) / (1+(ρ r’ / 100))≧1.1 (Formula 1)

[0063] Reflectance ρ r and reflectance ρ r’ Each indicates the average value of measurements taken at 20 locations. Reflectance measurements were performed using an ultraviolet-visible-near-infrared spectrophotometer (Hitachi, Ltd., product name: UH-4150) in accordance with JIS K0115:2004. For accurate measurements, the matte layer may be removed, if necessary. The difference in reflectance can be adjusted, for example, by adjusting the type and amount of colorant used. To increase reflectance, a high-brilliance pigment may be used as a colorant. While the white pattern is described as the first region R1 and the black pattern is described as the second region R2 in FIG. 5(a), these may be reversed. This also applies to FIGS. 5(b) to 5(d).

[0064] (ii) A method that utilizes the difference in light diffusion FIG. 5(b) is a schematic diagram illustrating that a difference in optical characteristics is provided between adjacent first and second regions due to a difference in light diffusion.

[0065] In FIG. 5(b), the first region R1 and the second region R2 have different light diffusion properties. Light incident from the coating layer 40 side is diffused relatively more on the surface of the white pattern (first region R1). The diffused light is again absorbed by the coating layer 40, resulting in relatively more curing. On the other hand, light incident from the coating layer 40 side is diffused relatively less on the surface of the black pattern (second region R2). The diffused light is again absorbed by the coating layer 40, resulting in relatively less curing. This difference in curing is particularly noticeable in the first curing treatment described below. As a result, a matte layer with a fine wrinkle structure is formed in the white pattern (first region R1), and a matte layer with a coarse wrinkle structure is formed in the black pattern (second region R2).

[0066] When the first region R1 and the second region R2 in FIG. 5(b) are irradiated with light having a wavelength of more than 320 nm and not more than 400 nm at an intensity I from the coating layer 40 side for a predetermined time, the diffusion coefficient in the first region R1 is ρ d(%), and the diffusion rate in the second region R2 is ρ d’ (%), the integrated light amount I absorbed by the coating layer 40 in the first region R1 t1 and the integrated light amount I absorbed by the coating layer 40 in the second region R2. t2 Ratio to (I t1 / I t2 ) becomes: I t1 / I t2 =(2-(ρ d / 100)) / (2-(ρ d’ / 100))

[0067] Integrated light intensity ratio I t1 / I t2 is preferably 1.1 or more. That is, the diffusion coefficient ρ d , and the diffusion coefficient ρ for the above wavelength light in the second region R2 d’ It is preferable that each of the following conditions be satisfied: (2-(ρ d / 100)) / (2-(ρ d’ / 100))≧1.1 (Formula 2)

[0068] Diffusion rate ρ d and diffusivity ρ d’ Each indicates the average value of measurements taken at 20 locations. The diffusivity is measured using an ultraviolet-visible-near-infrared spectrophotometer (Hitachi, Ltd., product name: UH-4150) in accordance with JIS K0115:2004. For accurate measurements, the matte layer may be removed as necessary. The difference in diffusivity can be adjusted, for example, by setting the amount of matting agent blended. The amount of matting agent blended is adjusted to a level that does not impair the desired design.

[0069] (iii) A method utilizing the difference in light transmittance 5(c) is a schematic diagram illustrating the difference in optical properties between adjacent first and second regions due to the difference in light transmittance. When utilizing the difference in light transmittance, it is preferable to have fewer layers constituting the decorative sheet, and this is particularly effective in producing the decorative sheet in the second embodiment described below.

[0070] In FIG. 5(c), the first region R1 and the second region R2 have different light transmittances. Light incident from the side opposite the coating layer 40 is transmitted through the white pattern (first region R1) in a relatively large amount. The transmitted light is absorbed by the coating layer 40, resulting in relatively greater curing. On the other hand, light incident from the side opposite the coating layer 40 is transmitted through the black pattern (second region R2) in a relatively small amount. The transmitted light is absorbed by the coating layer 40, resulting in relatively less curing. This difference in curing is particularly noticeable in the first curing treatment described below. As a result, a matte layer with a fine wrinkle structure is formed in the white pattern (first region R1), and a matte layer with a coarse wrinkle structure is formed in the black pattern (second region R2).

[0071] In FIG. 5(c), when the first region R1 and the second region R2 are irradiated with light having a wavelength longer than 320 nm and shorter than 400 nm at an intensity I from the side opposite to the coating layer 40 for a predetermined time, the integrated amount of light I absorbed by the coating layer 40 in the first region R1 is expressed as follows: t1 and the integrated light amount I absorbed by the coating layer 40 in the second region R2. t2 Ratio to (I t1 / I t2 ) becomes: I t1 / I t2 =τ / τ'

[0072] Integrated light intensity ratio I t1 / I t2 is preferably 1.1 or more. That is, it is preferable that the transmittance τ of the first region R1 for light of the above wavelength and the transmittance τ' of the second region R2 for light of the above wavelength each satisfy the following: τ / τ'≧1.1 (Equation 3)

[0073] The transmittance τ and the transmittance τ' each represent the average value of measurements taken at 20 locations. The transmittance is measured using an ultraviolet-visible-near-infrared spectrophotometer (manufactured by Hitachi, Ltd., product name: UH-4150) in accordance with JIS K0115:2004. For accurate measurements, the matte layer may be removed as necessary. The difference in reflectance can be adjusted, for example, by setting the type and amount of colorant used.

[0074] (iv) Use the difference in light absorption FIG. 5(d) is a schematic diagram illustrating that a difference in optical characteristics is provided between adjacent first and second regions due to a difference in light absorption.

[0075] In FIG. 5(d), the first region R1 and the second region R2 have different light absorption properties. Light incident from the coating layer 40 side is absorbed relatively less by the white pattern (first region R1). The reflected light is absorbed again by the coating layer 40, resulting in relatively more curing. On the other hand, light incident from the coating layer 40 side is absorbed relatively more by the black pattern (second region R2). The reflected light is absorbed again by the coating layer 40, resulting in relatively less curing. This difference in curing is particularly noticeable in the first curing treatment described below. As a result, a matte layer with a fine wrinkle structure is formed in the white pattern (first region R1), and a matte layer with a coarse wrinkle structure is formed in the black pattern (second region R2).

[0076] In FIG. 5(d), when the first region R1 and the second region R2 are irradiated with light having a wavelength longer than 320 nm and shorter than 400 nm at an intensity I from the coating layer 40 side for a predetermined time, the absorbance in the first region R1 is A (%) and the absorbance in the second region R2 is A' (%). The integrated amount of light I absorbed by the coating layer 40 in the first region R1 is t1 and the integrated light amount I absorbed by the coating layer 40 in the second region R2. t2 Ratio to (I t1 / I t2 ) becomes: I t1 / I t2=(2-(A / 100)) / (2-(A' / 100))

[0077] Integrated light intensity ratio I t1 / I t2 is preferably 1.1 or more. That is, it is preferable that the absorptance A for light of the above wavelength in the first region R1 and the absorptance A' for light of the above wavelength in the second region R2 each satisfy the following: (2-(A / 100)) / (2-(A' / 100))≧1.1 (Equation 4)

[0078] The absorbance A and the absorbance A' each represent the average value of measurements taken at 20 locations. The absorbance is measured using an ultraviolet-visible-near-infrared spectrophotometer (Hitachi, Ltd., product name: UH-4150) in accordance with JIS K0115:2004. For accurate measurements, the matte layer may be removed as necessary. The difference in absorbance can be adjusted, for example, by setting the amount of light absorber blended. The amount of light absorber blended is adjusted to a level that does not impair the desired design.

[0079] (4) Matte layer material The matte layer contains at least a cured resin, and may further contain various additives described below.

[0080] (i) Cured resin The cured resin is a cured product of a curable resin composition. The resin contained in the curable resin composition is preferably an ionizing radiation curable resin. In addition, an ionizing radiation curable resin is preferred in view of the ease of forming a matte layer and the ease of improving surface properties such as scratch resistance, strength, and weather resistance, as well as processability.

[0081] The ionizing radiation-curable resin is a resin having an ionizing radiation-curable functional group, which is a group that crosslinks and cures upon irradiation with ionizing radiation. Examples of the ionizing radiation-curable functional group include functional groups having an ethylenic double bond, such as a (meth)acryloyl group, a vinyl group, and an allyl group.

[0082] The term "(meth)acryloyl group" refers to an acryloyl group or a methcroyl group, and the term "(meth)acrylate" refers to an acrylate or a methacrylate.

[0083] Furthermore, ionizing radiation refers to electromagnetic waves or charged particle beams that have an energy quantum capable of polymerizing and / or crosslinking molecules. Typically, ultraviolet (UV) rays or electron beams (EB) are used, but it also includes other electromagnetic waves such as X-rays and gamma rays, and charged particle beams such as alpha rays and ion beams.

[0084] Ionizing radiation curable resins include electron beam curable resins and ultraviolet curable resins. Among these, ultraviolet curable resins are preferred. They can reduce the internal haze of the matte layer. They can also stabilize wrinkle formation by a wrinkle formation stabilizer, thereby improving the matte effect stably.

[0085] Specifically, the ionizing radiation curable resin can be appropriately selected from polymerizable monomers and polymerizable oligomers that have been conventionally used as ionizing radiation curable resins.

[0086] The polymerizable monomer is preferably a (meth)acrylate monomer having a radically polymerizable unsaturated group in the molecule, and particularly preferably a polyfunctional (meth)acrylate monomer. Examples of the polyfunctional (meth)acrylate monomer include a (meth)acrylate monomer having two or more ionizing radiation-curable functional groups in the molecule, and having at least a (meth)acryloyl group as the ionizing radiation-curable functional group.

[0087] The number of functional groups of the polyfunctional (meth)acrylate monomer is, for example, 2 or more and 8 or less, and may be 2 or more and 6 or less. Furthermore, when the number of functional groups is within the above range, a wrinkled structure is easily obtained. These polyfunctional (meth)acrylates may be used alone or in combination of two or more types.

[0088] The polymerizable monomers can be used alone or in combination of two or more kinds, and it is preferable to use two or more kinds of polymerizable monomers in combination. When two or more kinds of polymerizable monomers are used in combination, a combination of a monofunctional monomer and a polyfunctional monomer, or a combination of two or more kinds of polyfunctional monomers is preferred, and a combination of a polyfunctional monomer and a polyfunctional monomer is more preferred.

[0089] When a polyfunctional monomer is used, the number of functional groups is preferably 2 or more. The number of functional groups may be 8 or less, 6 or less, or 4 or less.

[0090] When a monofunctional monomer and a polyfunctional monomer are used in combination, the number of functional groups in the polyfunctional monomer is preferably 3 or less. In this case, the monofunctional monomer and the polyfunctional monomer are preferably (meth)acrylate monomers.

[0091] When two or more types of polyfunctional monomers are used, it is preferable to combine a monomer having two functional groups with a monomer having three functional groups. In this case, the polyfunctional monomer is preferably a (meth)acrylate monomer.

[0092] Examples of polymerizable oligomers include (meth)acrylate oligomers having two or more ionizing radiation-curable functional groups in the molecule, and having at least a (meth)acryloyl group as the ionizing radiation-curable functional group, such as urethane (meth)acrylate oligomers, epoxy (meth)acrylate oligomers, polyester (meth)acrylate oligomers, polyether (meth)acrylate oligomers, polycarbonate (meth)acrylate oligomers, and acrylic (meth)acrylate oligomers.

[0093] Further examples of polymerizable oligomers include highly hydrophobic polybutadiene (meth)acrylate oligomers having (meth)acrylate groups in the side chains of polybutadiene oligomers, silicone (meth)acrylate oligomers having polysiloxane bonds in the main chain, aminoplast resin (meth)acrylate oligomers obtained by modifying aminoplast resins having many reactive groups in a small molecule, and oligomers having cationically polymerizable functional groups in the molecule, such as novolac epoxy resins, bisphenol epoxy resins, aliphatic vinyl ethers, and aromatic vinyl ethers.

[0094] Examples of the polymerizable oligomer include urethane (meth)acrylate oligomer, epoxy (meth)acrylate oligomer, polyester (meth)acrylate oligomer, polyether (meth)acrylate oligomer, polycarbonate (meth)acrylate oligomer, and acrylic (meth)acrylate oligomer, with urethane (meth)acrylate oligomer and polycarbonate (meth)acrylate oligomer being preferred, and urethane (meth)acrylate oligomer being more preferred.

[0095] The polymerizable oligomer can be used alone or in combination of two or more types, and it is preferable to use one type of polymerizable oligomer alone. The number of functional groups of the polymerizable oligomer is, for example, 2 to 8, or may be 2 to 6, or may be 2 to 4. The weight-average molecular weight of the polymerizable oligomer is, for example, 2,500 to 7,500, or may be 3,000 to 7,000, or may be 3,500 to 6,000. Here, the weight-average molecular weight is the average molecular weight measured by GPC analysis and converted into standard polystyrene.

[0096] A polymerizable oligomer and a polymerizable monomer may be used in combination. In this case, the polymerizable oligomer is preferably a polyfunctional urethane (meth)acrylate oligomer, more preferably a polyfunctional urethane acrylate oligomer. The polymerizable monomer is preferably a polyfunctional polymerizable monomer, more preferably a polyfunctional (meth)acrylate monomer, and even more preferably a polyfunctional acrylate monomer. This stabilizes wrinkle formation, stably improves the matte effect, reduces the internal haze of the matte layer, and can also improve surface properties such as processing properties, scratch resistance, and weather resistance.

[0097] When a polymerizable oligomer and a polymerizable monomer are used in combination, the content of the polymerizable oligomer relative to 100 parts by mass of the total of the polymerizable oligomer and the polymerizable monomer is, for example, 20 parts by mass or more, or alternatively, 25 parts by mass or more, or 30 parts by mass or more, and the content of the polymerizable oligomer is, for example, 90 parts by mass or less, or alternatively, 80 parts by mass or less, or alternatively, 70 parts by mass or less.

[0098] Furthermore, polymerizable oligomers can be used in combination, and it is preferable to use a combination of two polymerizable oligomers with different numbers of functional groups. In this case, the content of the polymerizable oligomer with the larger number of functional groups relative to 100 parts by mass of the total amount of polymerizable oligomers is, for example, 50 parts by mass or more, or may be 55 parts by mass or more, or 60 parts by mass or more, or may be 65 parts by mass or more.

[0099] (ii) Wrinkle-forming stabilizers The matte layer may or may not contain a wrinkle formation stabilizer. When the matte layer does not contain a wrinkle formation stabilizer, internal haze can be reliably reduced.

[0100] On the other hand, when the matte layer contains a wrinkle formation stabilizer, wrinkles can be stably formed on the surface of the matte layer. Although a wrinkle structure can be formed in the matte layer without using a wrinkle formation stabilizer, the use of a wrinkle formation stabilizer stabilizes the formed wrinkle structure, resulting in a stable matte effect and uniform surface condition due to the stable formation of wrinkles over the entire surface of the matte layer. In this case, in order to reduce internal haze, it is preferable to at least one or both of the following: make the refractive indexes of the resin in the matte layer and the wrinkle formation stabilizer approximately the same, and increase the sphericity of the wrinkle formation stabilizer.

[0101] As the wrinkle formation stabilizer, for example, organic particles or inorganic particles can be used. Examples of organic substances constituting the organic particles include polymethyl methacrylate, acrylic-styrene copolymer resin, melamine resin, polycarbonate, polystyrene, polyvinyl chloride resin, benzoguanamine-melamine-formaldehyde condensate, silicone, fluorine-based resin, and polyester-based resin. Organic particles are preferred for reducing the refractive index difference between the resin and the wrinkle formation stabilizer and for reducing the internal haze of the matte layer. Examples of inorganic substances constituting the inorganic particles include silica, alumina, calcium carbonate, aluminosilicate, and barium sulfate. Among these, silica, which has excellent transparency, is preferred. Inorganic particles are preferred for improving the strength of the matte layer.

[0102] (iii) Photopolymerization initiators and photopolymerization accelerators When the curable resin composition contains an ultraviolet curable resin, the curable resin composition preferably contains at least one of a photopolymerization initiator and a photopolymerization accelerator.

[0103] Examples of the photopolymerization initiator include one or more selected from acetophenone, benzophenone, α-hydroxyalkylphenone, Michler's ketone, benzoin, benzil dimethyl ketal, benzoyl benzoate, α-acyloxime ester, thioxanthones, and the like.

[0104] The photopolymerization accelerator can reduce polymerization inhibition caused by air during curing and increase the curing rate. Examples of the photopolymerization accelerator include one or more selected from p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester, etc.

[0105] The content of the photopolymerization initiator is, for example, 0.1 parts by mass or more, or may be 0.3 parts by mass or more, or may be 0.5 parts by mass or more, relative to 100 parts by mass of the resin. The content of the photopolymerization initiator is, for example, 5 parts by mass or less, or may be 3 parts by mass or less, or may be 1.5 parts by mass or less, or may be 1.0 part by mass or less, relative to 100 parts by mass of the resin. When the content of the photopolymerization initiator is within the above range, the effect of using the photopolymerization initiator efficiently can be obtained. The content of the photopolymerization accelerator is the same as that of the photopolymerization initiator described above.

[0106] (iv) Weatherproofing agent The matte layer may contain weathering agents such as ultraviolet absorbers and light stabilizers. The addition of a weathering agent can impart weather resistance to the matte layer. Examples of ultraviolet absorbers include benzotriazole-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, triazine-based ultraviolet absorbers, and hydroxyphenyltriazine-based ultraviolet absorbers. Examples of light stabilizers include hindered amine-based light stabilizers such as piperidinyl sebacate-based light stabilizers. The ultraviolet absorbers or light stabilizers may also have a reactive functional group with an ethylenic double bond in the molecule, such as a (meth)acryloyl group, a vinyl group, or an allyl group. Weathering agents such as ultraviolet absorbers and light stabilizers can be used alone or in combination.

[0107] The content of the ultraviolet absorber is, for example, 0.1 parts by mass or more, 1.0 parts by mass or more, 2.0 parts by mass or more, or 3.0 parts by mass or more, relative to 100 parts by mass of the resin. Furthermore, the content of the ultraviolet absorber is, for example, 10.0 parts by mass or less, 8.0 parts by mass or less, 7.0 parts by mass or less, or 6.0 parts by mass or less, relative to 100 parts by mass of the resin. When the content of the ultraviolet absorber is within the above range, the effect of using the ultraviolet absorber efficiently can be obtained. Furthermore, the content of the light stabilizer is the same as that of the ultraviolet absorber described above.

[0108] (5) Matte layer The matte layer has a wrinkled structure and a concave shape that follows the concave shape of the resin layer 3 on the first surface, so that a good matte effect and a good tactile feeling can be obtained. Here, as shown in FIG. 1, the depth of the concave shape of the matte layer 4 that follows the concave shape of the resin layer 3 is defined as D 41 Depth D 41 is not particularly limited, but is, for example, 10 μm or more, may be 15 μm or more, or may be 20 μm or more. 41 The depth D is, for example, 100 μm or less, may be 90 μm or less, or may be 80 μm or less. 41 is the average value of measurements taken at any 10 points.

[0109] The 60° gloss value of the first surface of the matte layer is, for example, 10.0 or less, optionally 7.5 or less, optionally 5.0 or less, optionally 4.0 or less, or optionally 3.6 or less.

[0110] Here, the 60° gloss value of the first surface of the matte layer refers to the 60° specular gloss measured in accordance with JIS K5600-4-7:1999, and can be measured using, for example, a gloss meter. The 60° gloss value of the first surface of the matte layer is the average value of measurements taken at any 10 points.

[0111] The internal haze of the matte layer is, for example, 4.0% or less, and may be 3.6% or less. On the other hand, the lower limit of the internal haze of the matte layer is not particularly limited, but is preferably substantially 0% or more. Here, "substantially" means taking into consideration measurement error.

[0112] Here, the internal haze of the matte layer can be measured in accordance with JIS K7136:2000. When measuring the internal haze of the matte layer, for example, a transparent layer is placed on the first surface of the matte layer to fill in and flatten the wrinkled structure. This eliminates the influence of haze caused by the wrinkled structure. Furthermore, when measuring the internal haze of the matte layer, only the matte layer constituting the decorative sheet is separately prepared.

[0113] The thickness of the matte layer in the first region and the thickness of the matte layer in the second region are not particularly limited, but may be, for example, 3.0 μm or more, 3.2 μm or more, or 3.4 μm or more, and may be, for example, 40 μm or less, 30 μm or less, or 20 μm or less.

[0114] The thickness of the matte layer in the first region may be greater than, the same as, or smaller than the thickness of the matte layer in the second region. "The thickness of the matte layer in the first region is the same as the thickness of the matte layer in the second region" means that the thickness of the matte layer in the second region is 0.9 to 1.1 times the thickness of the matte layer in the first region.

[0115] The thickness of the matte layer is determined by measuring the thickness at 20 points on an image of the cross section of the decorative sheet taken using a scanning electron microscope (SEM), and taking the average of the 20 values. The SEM acceleration voltage is 3 kV, and the magnification is set according to the thickness. The same applies to the thickness of other layers.

[0116] The matte layer may be disposed partially or entirely on the resin layer. It is preferable that the matte layer be disposed entirely on the resin layer. It is also preferable that the first and second regions have a matte layer formed continuously.

[0117] (6) Method for forming a matte layer A method for forming a matte layer includes, for example, applying a curable resin composition for forming a matte layer to the side of the resin layer opposite the design layer and the side of the filling portion opposite the design layer to form a coating layer, and then curing the coating layer by irradiating it with ionizing radiation to form a matte layer having a wrinkled structure (wrinkle structure forming process).

[0118] Examples of methods for applying the curable resin composition include known methods such as gravure printing, bar coating, roll coating, reverse roll coating, and comma coating. The thickness of the coating layer is not particularly limited and is appropriately selected depending on the desired thickness of the matte layer. In addition, when the curable resin composition contains a solvent, it is preferable to dry the solvent after applying the curable resin composition.

[0119] The irradiation treatment using ionizing radiation involves (1) a first curing treatment using light with a wavelength of more than 320 nm and not more than 400 nm, (2) a second curing treatment using light with a wavelength of 100 nm or more and less than 200 nm, and (3) a third curing treatment using at least one of electron beam irradiation and light with a wavelength of 200 nm or more and not more than 400 nm, in this order.

[0120] The first curing treatment imparts an appropriate viscosity to the curable resin composition, which prevents the curable resin composition from sagging during the second curing treatment described below. The wavelength of the light used in the first curing treatment is typically greater than 320 nm and less than or equal to 400 nm, and may be greater than or equal to 385 nm and less than or equal to 400 nm.

[0121] The wavelength light used in the first curing treatment can be irradiated using an ultraviolet irradiation device that uses, for example, an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light fluorescent lamp, a metal halide lamp, or an LED light as a light source.

[0122] The ultraviolet irradiance in the first curing treatment is, for example, 0.01 W / cm 2 or more, and 0.1 W / cm 2 It may be 0.3 W / cm or more. 2 The ultraviolet irradiance in the first curing treatment may be, for example, 5 W / cm or more. 2 less than 3W / cm 2 may be less than 2 W / cm 2 It may be the following:

[0123] The wavelength light used in the second curing treatment is typically light with a wavelength of 100 nm or more and less than 200 nm, and may be light with a wavelength of 100 nm or more and 180 nm or less. The wavelength light used in the second curing treatment is preferably "excimer light," which includes light in the ultraviolet wavelength range from excited dimers, i.e., excimers, formed by discharge of rare gases such as Ar, Kr, Xe, and Ne, halogenated rare gases such as F, Cl, I, and Br, or mixed gases. Examples of wavelengths of excimer light and excimers used as a light source include light with a wavelength of 126 nm radiated from the excimer of Ar2 (hereinafter abbreviated as "126 nm (Ar2)"), 146 nm (Kr2), 157 nm (F2), 172 nm (Xe2), and 193 nm (ArF). As excimer light, either spontaneous emission light or laser light with high coherence due to stimulated emission can be used, but spontaneous emission light is usually sufficient. Discharge lamps that emit this light (ultraviolet light) are also called "excimer lamps."

[0124] Excimer light has a single wavelength peak and a narrower half-width wavelength than ordinary ultraviolet light (e.g., ultraviolet light emitted from metal halide lamps or mercury lamps). The use of such excimer light makes it easier to create wrinkle structures.

[0125] The integrated light amount in the second curing treatment is, for example, 1 mJ / cm 2 is equal to or greater than 2 mJ / cm 2 It may be more than 5 mJ / cm 2 The integrated light amount in the second curing treatment may be, for example, 1,000 mJ / cm 2 or more. 2 less than 300 mJ / cm 2 may be less than 100 mJ / cm 2 may be less than 10 mJ / cm 2 It may be the following:

[0126] The ultraviolet irradiance in the second curing treatment is, for example, 1 mW / cm 2 and above 5 mW / cm 2 It may be 10 mW / cm or more. 2 The ultraviolet irradiance in the second curing treatment may be, for example, 10 W / cm or more. 2 less than 3W / cm 2 may be less than 1 W / cm 2 may be less than 500 mW / cm 2 may be less than 300 mW / cm 2 may be less than 150 mW / cm 2 It may be the following:

[0127] The oxygen concentration in the second curing treatment is preferably lower, for example, 1,000 ppm or less, or may be 750 ppm or less, 500 ppm or less, or 300 ppm or less.

[0128] The electron beam irradiation conditions employed in the third curing treatment are not particularly limited as long as they cure the curable resin composition. The electron beam acceleration voltage is, for example, 10 kV or more, and may be 30 kV or more, 50 kV or more, or 75 kV or more. The electron beam acceleration voltage is, for example, 300 kV or less, 250 kV or less, or 200 kV or less. The electron beam irradiation dose is, for example, 5 kGy or more, 10 kGy or more, or 15 kGy or more. The electron beam irradiation dose is, for example, 150 kGy or less, 125 kGy or less, or 100 kGy or less.

[0129] The electron beam source is not particularly limited as long as it can achieve the above-mentioned irradiation conditions, and various electron beam accelerators such as Cockcroft-Walton type, Van de Graaf type, resonant transformer type, insulating core transformer type, linear type, dynamitron type, and high frequency type can be used.

[0130] The wavelength light used in the third curing treatment is typically light with a wavelength of 200 nm or more and 400 nm or less. The wavelength light used in the third curing treatment can be irradiated using an ultraviolet irradiation device with a light source such as an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light fluorescent lamp, or a metal halide lamp. The third curing treatment may also use excimer light with a wavelength of 200 nm or more and 400 nm or less, such as 222 nm (KrCl), 247 nm (KrF), or 308 nm (XeCl).

[0131] The output of the ultraviolet irradiation device in the third curing treatment is, for example, 50 W / cm or more, and may be 100 W / cm or more. The output of the ultraviolet irradiation device in the third curing treatment is, for example, 300 W / cm or less, and may be 200 W / cm or less. The irradiation speed in the third curing treatment is, for example, 1 r / min or more, and may be 3 r / min or more. The irradiation speed in the third curing treatment is, for example, 50 r / min or less, and may be 10 r / min or less.

[0132] 3.Base material layer The substrate layer is a member that supports the matte layer. Furthermore, by having a substrate layer in a decorative sheet, various performance properties such as mechanical strength, suitability for post-processing, and design properties are improved, thereby improving usability as a sheet.

[0133] The substrate layer is not particularly limited, and examples thereof include a resin substrate, a glass substrate, a metal substrate, and a fiber substrate. The type of substrate layer is appropriately selected depending on the application of the decorative sheet.

[0134] Resins used for the resin substrate include, for example, various synthetic resins and various natural resins. Examples of synthetic resins include thermoplastic resins and cured resins (cured products of curable resins). Considering the manufacturing suitability, handling suitability, and post-processing suitability of the decorative sheet, thermoplastic resins are preferred.

[0135] Examples of thermoplastic resins include olefin resins such as polyethylene, polypropylene, polymethylpentene, ionomers, and various olefin-based thermoplastic elastomers; vinyl chloride resins such as polyvinyl chloride, polyvinylidene chloride, and vinyl chloride-vinyl acetate copolymers; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, ethylene glycol-terephthalic acid-isophthalic acid copolymers, and polyester-based thermoplastic elastomers; acrylic resins such as polymethyl (meth)acrylate, polyethyl (meth)acrylate, polybutyl (meth)acrylate, and methyl (meth)acrylate-butyl (meth)acrylate copolymers; polyamide resins such as nylon 6 and nylon 66; cellulose resins such as cellulose triacetate, cellophane, and celluloid; styrene resins such as polystyrene, acrylonitrile-styrene copolymers, and acrylonitrile-butadiene-styrene copolymers; polyvinyl alcohol, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, polycarbonate resins, polyarylate resins, and polyimide resins.

[0136] Examples of natural resins include natural rubber, pine resin, and amber, while examples of curable resins include ionizing radiation curable resins and thermosetting resins.

[0137] Examples of metals used for the metal substrate include aluminum or aluminum alloys such as duralumin, iron or iron alloys such as carbon steel and stainless steel, copper or copper alloys such as brass and bronze, gold, silver, chromium, nickel, cobalt, tin, and titanium. The metal substrate may have a plated film or an anodized film on its surface.

[0138] Examples of fibrous materials used for the fiber substrate include tissue paper, kraft paper, fine paper, Japanese paper, titanium paper, linter paper, parchment paper, parchment paper, glassine paper, wallpaper backing paper, paperboard, and plasterboard base paper; and woven or nonwoven fabrics made from fibers such as polyester resin fibers, acrylic resin fibers, protein- or cellulose-based natural fibers such as silk, cotton, and hemp, glass fibers, and carbon fibers. Various resins, such as acrylic resin, styrene-butadiene rubber, melamine resin, and urethane resin, may be added to the fiber substrate. When the fiber substrate is a paper substrate, the strength between the fibers of the paper substrate or the interlayer strength between the paper substrate and other substrates can be improved. Furthermore, fluffing can be suppressed. Resin addition methods include impregnation with the resin after papermaking, or incorporation of the resin during papermaking. Examples of paper substrates to which resin has been added include inter-fiber reinforced paper and resin-impregnated paper.

[0139] In the case of a fibrous substrate, a permeation-preventing resin layer is preferably disposed on the matte layer side of the fibrous substrate. Examples of resins used for the permeation-preventing resin layer include two-component curing urethane resins.

[0140] The substrate layer may contain additives as needed. In the case of a resin substrate, examples of additives include inorganic fillers, flame retardants, lubricants, foaming agents, antioxidants, ultraviolet absorbers, light stabilizers, and colorants. Various additives can be used alone or in combination. The content of the additives is not particularly limited as long as it does not impair surface properties and processing properties, and can be appropriately set depending on the required properties.

[0141] In order to improve weather resistance, among the above additives, it is preferable to use weather resistance agents such as ultraviolet absorbers and light stabilizers. The ultraviolet absorbers and light stabilizers may be the same as those used in the matte layer.

[0142] The substrate layer may be a single layer or a laminate of two or more layers. In the case of a laminate, the substrate layer may have two or more layers of the same type of substrate, or may have two or more layers of different types of substrate. The substrate layer can also serve as a design layer, which will be described later. Furthermore, the substrate layer may be transparent or opaque. When the substrate layer is opaque, the substrate layer can serve as a design layer.

[0143] The substrate layer may be colored. When the substrate layer is colored, the substrate layer can serve as a design layer. The coloring mode is not particularly limited, and may be transparent or opaque (hiding), which can be selected as desired.

[0144] When the base layer is colored, it may contain a colorant. The colorant is the same as the colorant used in the resin layer described above. For example, when the surface hue of the adherend on which the decorative sheet is laminated varies, an inorganic pigment such as a white pigment may be used to conceal the surface hue and improve the color stability of the design layer.

[0145] The substrate layer may be surface-treated to enhance adhesion with layers in contact with the substrate layer, such as with a design layer or an adhesive layer. Examples of surface treatments include physical surface treatments such as oxidation and roughening, as well as chemical surface treatments. Examples of oxidation methods include corona discharge treatment, chromium oxidation treatment, flame treatment, hot air treatment, and ozone-ultraviolet treatment. Examples of roughening methods include sandblasting and solvent treatment. These surface treatments are appropriately selected depending on the type of substrate layer, but considering the effect of the surface treatment and operability, corona discharge treatment is generally preferred.

[0146] When the substrate layer is a laminate, an adhesive layer or a primer layer may be disposed between adjacent layers to improve the adhesion between the layers.

[0147] The thickness of the substrate layer is not particularly limited and is appropriately selected depending on the material of the substrate layer. In the case of a substrate layer containing a resin, the thickness of the substrate layer is, for example, 10 μm to 500 μm, or may be 20 μm to 300 μm, or may be 40 μm to 200 μm. In addition, when the substrate layer is a paper substrate, the basis weight is, for example, 20 g / m 2 More than 150g / m 2 less than 30 g / m 2 More than 100g / m 2 It may be the following:

[0148] 4. Design layer The decorative sheet has a design layer between the substrate layer and the resin layer. Examples of the design layer include a colored layer and a patterned layer. The design layer may also have a colored layer and a patterned layer. The first region may or may not have a design layer. On the other hand, it is preferable that the second region has a design layer.

[0149] The colored layer may be a so-called solid colored layer disposed over the entire surface of the decorative sheet. On the other hand, the design (pattern) of the design layer is not particularly limited, and examples thereof include wood grain patterns such as tree rings and vessels on the surface of a wooden board, stone grain patterns on the surface of stone slabs such as marble and granite, fabric grain patterns on the surface of fabrics, leather grain patterns on the surface of leather, geometric patterns, letters, figures, and combinations thereof.

[0150] The design layer preferably contains a binder resin and a colorant. The binder resin used in the design layer is not particularly limited, but examples thereof include urethane resin, acrylic polyol resin, acrylic resin, ester resin, amide resin, butyral resin, styrene resin, urethane-acrylic copolymer, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate-acrylic copolymer resin, chlorinated propylene resin, nitrocellulose resin, and cellulose acetate resin. Various resins can also be used, such as one-component curing resins and two-component curing resins containing a curing agent such as an isocyanate compound.

[0151] Examples of colorants used in the design layer include pigments and dyes. Among these, the colorant is preferably a pigment with excellent hiding power and weather resistance. The colorant is the same as the colorant used in the resin layer described above. The content of the colorant is, for example, 5 to 90 parts by mass, 15 to 80 parts by mass, or 30 to 70 parts by mass, per 100 parts by mass of the binder resin.

[0152] The design layer may contain additives such as weathering agents such as ultraviolet absorbers and light stabilizers, extender pigments, stabilizers, plasticizers, hardeners, and catalysts, as needed. The design layer may also be a metal layer. Examples of metal materials used for the metal layer include aluminum, chromium, tin, and indium. The metal layer is formed, for example, by a vapor deposition method.

[0153] The thickness of the design layer is not particularly limited. For example, when the design layer has at least one of a colored layer and a patterned layer, the thickness of the design layer is, for example, 0.5 μm to 20 μm, or may be 1 μm to 10 μm, or may be 2 μm to 5 μm, in consideration of concealing the base color of the adherend and improving the design.

[0154] 5. Other layers As shown in Figure 6(a), the decorative sheet 10 may have a primer layer 6 between the resin layer 3 and the matte layer 4. In the first region R1 in Figure 6(a), the primer layer 6 is disposed between the filling portion 5 and the matte layer 4. Furthermore, as shown in Figure 6(b), the decorative sheet 10 may have an adhesive layer 7 on the side of the base layer 1 opposite the resin layer 3.

[0155] (1) Primer layer The decorative sheet may have a primer layer to improve interlayer adhesion between the multiple layers that make up the decorative sheet. The primer layer may be disposed between any of the layers between the substrate layer and the matte layer. The primer layer may also be disposed on the side of the substrate layer opposite the design layer (rear primer layer).

[0156] The primer layer is primarily composed of a binder resin, and may contain additives such as ultraviolet absorbers and light stabilizers as needed. Examples of binder resins include urethane resins, acrylic polyol resins, acrylic resins, ester resins, amide resins, butyral resins, styrene resins, urethane-acrylic copolymers, polycarbonate-based urethane-acrylic copolymers (urethane-acrylic copolymers derived from polymers (polycarbonate polyols) having carbonate bonds in the polymer main chain and two or more hydroxyl groups at the terminals and side chains), vinyl chloride-vinyl acetate copolymer resins, vinyl chloride-vinyl acetate-acrylic copolymer resins, chlorinated propylene resins, nitrocellulose resins (nitrocellulose), and cellulose acetate resins. These may be used alone or in combination.

[0157] The binder resin may be a resin obtained by adding a curing agent such as an isocyanate-based curing agent or an epoxy-based curing agent to the above-mentioned resin and crosslinking and curing it. Specific examples include a resin obtained by crosslinking and curing a polyol-based resin such as an acrylic polyol resin with an isocyanate-based curing agent, and a resin obtained by crosslinking and curing an acrylic polyol resin with an isocyanate-based curing agent.

[0158] The thickness of the primer layer is, for example, 0.5 μm or more, or may be 1 μm or more, or 2 μm or more. The thickness of the primer layer is, for example, 10 μm or less, or may be 8 μm or less, or may be 6 μm or less. The primer layer can be formed by applying a resin composition and, if necessary, drying and curing the composition.

[0159] (2) Adhesive layer The decorative sheet may have an adhesive layer on the side of the base layer opposite the resin layer. The adhesive layer is, for example, a layer for attaching the decorative sheet to an adherend. The decorative sheet may also have an adhesive layer between the design layer and the resin layer.

[0160] The adhesive layer may be transparent or opaque. Examples of adhesives used in the adhesive layer include curing adhesives and pressure-sensitive adhesives. Specific examples include urethane adhesives, acrylic adhesives, epoxy adhesives, silicone adhesives, and rubber adhesives. Optically clear adhesive (OCA) or optically clear resin (OCR) may also be used in the adhesive layer.

[0161] From the viewpoint of efficiently obtaining a desired adhesive strength, the thickness of the adhesive layer is, for example, from 5 μm to 100 μm, or alternatively from 10 μm to 75 μm, or alternatively from 20 μm to 50 μm. Examples of methods for forming the adhesive layer include a method of applying an adhesive composition and a method of laminating an adhesive film by dry lamination.

[0162] Furthermore, when the decorative sheet has an adhesive layer on the side of the base layer opposite the resin layer, the decorative sheet may have a separator layer on the side of the adhesive layer opposite the base layer. The separator layer is a member that protects the adhesive layer and is peeled off when the decorative sheet is attached to an adherend. Conventionally known separator layers can be used as the separator layer.

[0163] A-2. Second embodiment 7 is a schematic cross-sectional view illustrating a decorative sheet according to the second embodiment. The decorative sheet 10 shown in FIG. 7 has a resin layer 3, a design layer 2, and a matte layer 4 arranged in a thickness direction D T 7, the decorative layer 2 and the matte layer 4 have, in this order. The matte layer 4 has a wrinkle structure w on the surface S1 (also referred to as the first surface) opposite to the resin layer 3. The resin layer 3 has a plurality of recesses 31 on the surface on the matte layer 4 side. For convenience, only a single recess 31 is shown in FIG. 7. The decorative layer 2 and the matte layer 4 each have a recessed shape that follows the recess 31 of the resin layer 3. The decorative sheet 10 is also formed by arranging the decorative layer 2 and the matte layer 4 in the thickness direction D. T From this perspective, if the area overlapping with the recess 31 is defined as the first region R1 and the area not overlapping with the recess 31 is defined as the second region R2, in the first region R1, a filling portion 5 containing a colorant is arranged between the resin layer 3 (or the design layer 2) and the matte layer 4.

[0164] According to the second embodiment, the matte layer has a wrinkled structure, resulting in a decorative sheet with good matte properties. Furthermore, the matte layer's wrinkled structure provides a silky feel. Furthermore, in addition to having a wrinkled structure, the matte layer has a concave shape that follows the concave shape of the resin layer, providing a distinct feel that conforms to the concave shape. Furthermore, the decorative sheet has a design layer and a filling portion that fills the concave portion of the resin layer. Because the design layer and the filling portion are positioned differently in the thickness direction, a three-dimensional design can be expressed when the decorative sheet is viewed from the thickness direction, resulting in good design properties.

[0165] As shown in FIG. 8(a), the decorative sheet 10 may have a primer layer 6 between the resin layer 3 and the matte layer 4. In the first region R1 in FIG. 8(a), the primer layer 6 is disposed between the filling portion 5 and the matte layer 4. As shown in FIG. 8(b), the decorative sheet 10 may have an adhesive layer 7 on the side of the resin layer 3 opposite the matte layer 4. Although not specifically shown, when the decorative sheet has an adhesive layer on the side of the resin layer opposite the matte layer, the decorative sheet may have a separator layer on the side of the adhesive layer opposite the resin layer. Details of each layer constituting the decorative sheet in the second embodiment are the same as those described above in "A-1. First Embodiment."

[0166] B. Manufacturing method of decorative sheet The method for producing a decorative sheet according to the present disclosure has two embodiments, which will be explained below as a first embodiment and a second embodiment.

[0167] B-1. First embodiment 9A and 9B are schematic cross-sectional views illustrating a method for producing a decorative sheet according to the first embodiment. As shown in Fig. 9A, a base layer 1, a design layer 2, and a resin layer 3 are laminated in a thickness direction D T A laminate 15 having the above components in this order is prepared (laminate preparation step). Next, as shown in FIG. 9(b), a plurality of recesses 31 are formed on the surface of the resin layer 3 of the laminate 15 opposite the design layer 2 (recess formation step). Next, as shown in FIG. 9(c), ink is filled into at least a portion of the recesses 31 and dried to form filled portions 5 (filled portion formation step). Next, as shown in FIG. 9(d), a matte layer 4 is formed on the surface of the resin layer 3 opposite the design layer 2 and on the surface of the filled portions 5 opposite the design layer 2 (matte layer formation step). This results in a decorative sheet 10.

[0168] According to the first embodiment, by carrying out the steps described above, a decorative sheet having good matte properties, a good feel, and a good design can be obtained.

[0169] 1.Laminate preparation process The laminate preparation step is a step of preparing a laminate having a base layer, a design layer, and a resin layer in this order in the thickness direction.

[0170] The laminate can be produced, for example, by forming a design layer on one side of a substrate layer and then disposing a resin layer on the opposite side of the design layer from the substrate layer. The design layer can be formed, for example, by coating with a design layer-forming ink containing a colorant, a binder resin, and a solvent (or dispersion medium).

[0171] Examples of the coating method include printing. Examples of printing methods include gravure printing, offset printing, screen printing, flexographic printing, electrostatic printing, and inkjet printing. Examples of coating methods for forming a solid layer include roll coating, knife coating, air knife coating, die coating, lip coating, comma coating, kiss coating, flow coating, and dip coating.

[0172] An example of a method for arranging the resin layer is extrusion lamination. Specifically, a laminate having the base layer, the design layer, and the resin layer in this order in the thickness direction is obtained by extrusion laminating a component having a base layer and a design layer. Another example of a method for arranging the resin layer is a method in which an adhesive layer is formed on the side of the design layer opposite the base layer, and the design layer and the resin layer are bonded via the adhesive layer.

[0173] 2. Recess formation process The recess formation step is a step of forming multiple recesses on the surface of the resin layer of the laminate opposite the design layer. The method of forming the recesses is not particularly limited, but embossing, for example, can be used. In embossing, for example, the laminate is heated and softened on a heated drum, then further heated with an infrared radiant heater, and pressed and shaped with an embossing plate with a desired concave-convex pattern, and then cooled and fixed. The heating temperature of the laminate during embossing is, for example, 80°C or higher and 260°C or lower, and may be 100°C or higher and 200°C or lower.

[0174] 3. Filling part forming process The filling portion forming process is a process of forming a filling portion by filling at least a portion of the recess with ink and drying it. The method of forming the filling portion is not particularly limited, but an example thereof is wiping. Specifically, a method is exemplified in which ink containing a colorant is supplied to the surface of the laminate on the recess side, and then the ink is wiped with a doctor blade, and then the ink is dried. In wiping, the ink is usually filled into the recess, and excess ink outside the recess is removed.

[0175] 4.Matte layer formation process The matte layer forming step is a step of forming a matte layer on the surface of the resin layer opposite the design layer and on the surface of the filling portion opposite the design layer after the filling portion forming step. The matte layer forming step further includes a wrinkle structure forming step in which a curable resin composition for forming the matte layer is applied to form a coating layer, and the coating layer is cured by irradiating with ionizing radiation to form a wrinkle structure. The ionizing radiation irradiation step includes (1) a first curing step using light with a wavelength of more than 320 nm and less than 400 nm, (2) a second curing step using light with a wavelength of 100 nm or more and less than 200 nm, and (3) a third curing step using at least one of electron beam irradiation and light with a wavelength of 200 nm or more and less than 400 nm, in this order. The wrinkle structure forming step is the same as described in "A-1. First Embodiment."

[0176] 5. Decorative sheets The decorative sheet obtained by the above-mentioned steps is the same as that described in "A-1. First embodiment."

[0177] B-2. Second embodiment Fig. 10 is a schematic cross-sectional view illustrating a method for manufacturing a decorative sheet in a second embodiment. As shown in Figs. 10(a) and (b), multiple recesses 31 are formed on one surface of the resin layer 3 (recess formation step). Next, as shown in Fig. 10(c), a design layer 2 is formed on one surface of the resin layer 3 (the surface on the recess 31 side) (design layer formation step). Next, as shown in Fig. 10(d), ink is filled into at least a portion of the recesses 31 and dried to form filled portions 5 (filled portion formation step). Next, as shown in Fig. 10(e), a matte layer 4 is formed on the surface of the design layer 2 opposite the resin layer 3 and on the surface of the filled portions 5 opposite the resin layer 3 (matte layer formation step). This results in a decorative sheet 10.

[0178] According to the second embodiment, by carrying out the steps described above, a decorative sheet having good matte properties, a good feel, and a good design can be obtained.

[0179] 1. Recess formation process The recess forming step is a step of forming a plurality of recesses on one surface of the resin layer, and the method of forming the recesses is the same as that described in the first embodiment.

[0180] 2. Design layer formation process The design layer forming step is a step of forming a design layer on one side of the resin layer after the recess forming step. The method of forming the design layer is the same as that described in the first embodiment above.

[0181] 3. Filling portion forming process, matte layer forming process and decorative sheet The filling portion forming step and the matte layer forming step are the same as those described in the first embodiment. The decorative sheet obtained by each of the above steps is the same as that described in "A-2. Second embodiment."

[0182] C. Decorative materials The cosmetic material according to the present disclosure has two embodiments, which will be described below as a first embodiment and a second embodiment.

[0183] C-1. First embodiment 11 is a schematic cross-sectional view illustrating a decorative material according to the first embodiment. In the decorative material 100 shown in FIG. 11, the adherend 20 and the decorative sheet 10 are T The decorative sheet 10 is the decorative sheet described above in "A-1. First embodiment." Furthermore, the matte layer 4 is disposed on the opposite side of the substrate layer 1 from the adherend 20. In FIG. 11, the decorative sheet 10 and the adherend 20 are bonded via the adhesive layer 7 of the decorative sheet 10.

[0184] According to the first embodiment, by using the decorative sheet described above, a decorative material having good matte properties, a good feel, and good design properties can be obtained.

[0185] 1.Adherend The shape of the adherend is not particularly limited, and examples thereof include plate-like shapes such as flat plates and curved plates; three-dimensional shapes such as cylinders and polygonal pillars; and sheets. The adherend may be a wooden member. Examples of the wooden member include wood fiberboards. Examples of the wood fiberboard include wood veneers, wood plywood, laminated lumber, particle boards, and MDF (medium density fiberboard). Examples of the material for the wooden member include wood such as cedar, cypress, pine, and lauan.

[0186] The adherend may be a metal member. Examples of metals used for the metal member include iron, aluminum, copper, and alloys containing one or more of these metals. The adherend may also be a ceramic member such as glass or porcelain, or a non-ceramic member such as gypsum, cement, ALC (aerated lightweight concrete), or calcium silicate.

[0187] The adherend may be a resin member. Examples of resins used for the resin member include acrylic resin, polyester resin, polystyrene resin, polyolefin resin such as polypropylene, ABS resin, phenol resin, vinyl chloride resin, cellulose resin, and rubber.

[0188] 2. Decorative sheet The decorative sheet is the same as that described above in "A-1. First embodiment," so a description thereof will be omitted here.

[0189] 3. Cosmetic materials The uses of decorative materials are not particularly limited, and examples thereof include architectural components such as walls, ceilings, floors, roofs, eaves ceilings, fences, and gates; fittings or fixtures such as window frames, doors, handrails, baseboards, moldings, and other building components; general furniture such as chests of drawers, shelves, and desks; kitchen furniture such as dining tables and sinks; various types of furniture used in wet areas such as kitchens, toilets, bathrooms, and washbasins; surface decorative panels for cabinets and the like for home appliances and office equipment; and interior or exterior components for vehicles. Furthermore, decorative materials may be components used outdoors (exterior components) or indoors (interior components).

[0190] C-2. Second embodiment 12 is a schematic cross-sectional view illustrating a decorative material according to the second embodiment. In the decorative material 100 shown in FIG. 12, the adherend 20 and the decorative sheet 10 are T The decorative sheet 10 is the decorative sheet described above in "A-2. Second embodiment." Furthermore, the matte layer 4 is disposed on the opposite side of the resin layer 3 from the adherend 20. In FIG. 12, the decorative sheet 10 and the adherend 20 are bonded via the adhesive layer 7 of the decorative sheet 10.

[0191] According to the second embodiment, by using the decorative sheet described above, a decorative material having a good matte finish and a good feel and design is obtained. The decorative material in the second embodiment is the same as the decorative material in the first embodiment described above, except that the decorative sheet described in "A-2. Second embodiment" above is used as the decorative sheet.

[0192] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are merely examples, and anything that has substantially the same configuration as the technical idea described in the claims of the present disclosure and exhibits similar effects is included within the technical scope of the present disclosure. [Example]

[0193] [Example 1] (Production of decorative sheets) A wood grain pattern design layer (decorative layer) was formed on a base layer (60 μm thick polypropylene film) by gravure printing. Next, a transparent polypropylene sheet was extrusion laminated onto the formed design layer to form a resin layer (80 μm thick). This resulted in a laminate having the base layer, design layer, and resin layer in this order in the thickness direction.

[0194] The laminate was then heated to soften it, and an embossing plate for a wood grain pattern was pressed against the surface of the laminate facing the resin layer to form multiple recesses. The recess depth was 60 μm and the recess width was 500 μm. Next, the ink for filling described below was applied to the surface of the resin layer facing the recesses, and a doctor blade was pressed perpendicular to the laminate to scrape off the ink for filling, forcing the ink into the recesses of the resin layer while removing excess ink. The ink was then dried.

[0195] <Ink for filling parts> Urethane acrylate resin: 20 parts by weight Color pigments (carbon black, quinacridone, isoindolinone): 10 parts by mass UV absorber: 3 parts by weight Dilution solvent (methyl ethyl ketone): 70 parts by weight

[0196] Then, a composition containing an acrylic resin and a urethane resin was applied to form a primer layer having a thickness of 2 μm. On the primer layer, the following curable resin composition for a matte layer was applied in a dry coating amount of 5 g / m2 on the second region. 2 The coating was carried out so as to form a coating layer. <Curable resin composition for matte layer> Bifunctional acrylate monomer 50 parts by mass Trifunctional acrylate monomer 30 parts by mass Trifunctional urethane acrylate oligomer 20 parts by mass Photopolymerization initiator (benzophenone type) 2.0 parts by mass Wrinkle formation stabilizer (silica particles, average particle size: 8 μm) 3.0 parts by weight

[0197] Thereafter, the coating layer was irradiated with ultraviolet light using a UV irradiation device consisting of LEDs (LED-UV irradiation, wavelength 395 nm, maximum irradiance 0.6 W / cm 2 , cumulative light intensity 30~100mJ / cm 2 Next, ultraviolet light was irradiated using an excimer light irradiation device (excimer irradiation, wavelength 172 nm (Xe2), ultraviolet output density 30 mW / cm 2 , cumulative light intensity 5~100mJ / cm 2 , nitrogen atmosphere). Further, an electron beam was irradiated (accelerating voltage 100 to 150 kV, exposure dose 30 to 100 kGy, nitrogen atmosphere) to form a matte layer having a wrinkled structure. This gave a decorative sheet.

[0198] [Examples 2 to 4] A decorative sheet was obtained in the same manner as in Example 1, except that the recess depth and recess width were changed as shown in Table 1 by changing the embossing plate.

[0199] [Comparative Example 1] A decorative sheet was obtained in the same manner as in Example 1, except that the embossing plate was changed to change the recess depth and recess width as shown in Table 1, and wiping processing was not performed.

[0200] Comparative Example 2 A decorative sheet was obtained in the same manner as in Example 1, except that the embossing and wiping processes were not carried out.

[0201] [evaluation] (Matte) When the surface of the matte layer (the surface opposite the resin layer) of the decorative sheets obtained in Examples 1 to 4 and Comparative Examples 1 and 2 was observed under a microscope, a structure with irregular wrinkles was confirmed. Furthermore, when the decorative sheets were observed from the matte layer side, it was confirmed that the decorative sheets had good matte properties. Meanwhile, when the cross sections of the decorative sheets obtained in Examples 1 to 4 and Comparative Examples 1 and 2 were observed under a microscope, it was confirmed that the matte layer had a concave shape that followed the concave shapes of the resin layer.

[0202] (Tactile sensation) Tactile evaluations were conducted by 20 adult evaluators who touched the surface of the matte layer of the decorative sheets obtained in Examples 1 to 4 and Comparative Examples 1 and 2. Oxford cloth made with 80-count cotton yarn was used as the standard for smooth tactile feel. A rating of "A" indicates that 18 or more of the 20 evaluators rated the overall tactile feel as close to the standard as possible, and that they could recognize a tactile feel that matched the embossing. A rating of "B" indicates that 14 to 17 of the 20 evaluators rated the overall tactile feel as close to the standard as possible, and that they could recognize a tactile feel that matched the embossing. A rating of "C" indicates that 13 or fewer of the 20 evaluators rated the overall tactile feel as close to the standard as possible, and that they could recognize a tactile feel that matched the embossing. The results are shown in Table 1.

[0203] (Design) The design evaluation was performed by 20 adult evaluators by observing the surface of the matte layer of the decorative sheets obtained in Examples 1 to 4 and Comparative Examples 1 and 2. A rating of "A" indicates that 18 or more of the 20 evaluators judged that a clear design was formed along the embossing on the uniform surface of the matte layer. A rating of "B" indicates that 14 to 17 of the 20 evaluators judged that a clear design was formed along the embossing on the uniform surface of the matte layer. A rating of "C" indicates that 13 or fewer of the 20 evaluators judged that a clear design was formed along the embossing on the uniform surface of the matte layer. The results are shown in Table 1.

[0204] [Table 1]

[0205] As shown in Table 1, it was confirmed that Examples 1 to 4 had good matte properties and also good tactile feel and design properties. On the other hand, Comparative Example 1 was not subjected to wiping processing, and did not achieve good design properties compared to Examples 1 to 4. Furthermore, Comparative Example 2 was not subjected to embossing or wiping processing, and did not achieve good tactile feel or good design properties compared to Examples 1 to 4.

[0206] [Reference example] The effect of the base color on the wrinkle structure of the matte layer was evaluated. First, a solid layer was formed by printing a single color on a 60 μm-thick colored polypropylene substrate. Four solid layers with four different brightness levels (white, light gray, dark gray, and black) were formed. Next, a transparent polypropylene sheet was extrusion laminated onto the solid layer to form a resin layer (80 μm thick).

[0207] Thereafter, the following curable resin composition for a matte layer was applied to the formed resin layer in a dry coating amount of 5 g / m 2 The coating was carried out so as to form a coating layer. <Curable resin composition for matte layer> Bifunctional acrylate monomer 50 parts by mass Trifunctional acrylate monomer 30 parts by mass Trifunctional urethane acrylate oligomer 20 parts by mass Photopolymerization initiator (benzophenone type) 2.0 parts by mass Wrinkle formation stabilizer (silica particles, average particle size: 8 μm) 3.0 parts by weight

[0208] Thereafter, the coating layer was irradiated with ultraviolet light using a UV irradiation device consisting of LEDs (LED-UV irradiation, wavelength 395 nm, maximum irradiance 0.6 W / cm 2 , cumulative light intensity 30~100mJ / cm 2 Next, ultraviolet light was irradiated using an excimer light irradiation device (excimer irradiation, wavelength 172 nm (Xe2), ultraviolet output density 30 mW / cm 2 , cumulative light intensity 5~100mJ / cm 2 , nitrogen atmosphere). Further, an electron beam was irradiated (accelerating voltage 100 to 150 kV, exposure dose 30 to 100 kGy, nitrogen atmosphere) to form a matte layer having a wrinkled structure. In this way, an evaluation sheet was obtained.

[0209] The color difference of the obtained evaluation sheet was measured. Specifically, 10 samples of 5 cm x 5 cm were cut out from the obtained evaluation sheet. These were measured for color using a spectrophotometer / color difference meter CM-700D (manufactured by Konica Minolta, Inc.). * , a * and b * was calculated as the average of 10 points. * , a * and b * The color difference ΔE between each evaluation sheet was calculated from the above. For the measurement, the incident angle was 10 degrees, the light source was D65 light source, the viewing angle was 2 degrees, the measurement diameter was 8 mm, and the measurement mode was total light reflection (specular reflection light + diffuse reflection light). The results are shown in Tables 2 and 3.

[0210] The RSm (average length of curved elements), Ra (arithmetic mean roughness), and Rz (maximum height) of the wrinkle structure of the obtained evaluation sheet were measured in accordance with JIS B0601:2013, specifically by the following method. Specifically, measurements were taken within 10 rectangular areas (1024 μm × 768 μm) of the evaluation sheet using a shape analysis laser microscope ("VK-X150 (control unit) / VK-X160 (measurement unit)" manufactured by Keyence Corporation) with an objective lens of 50x, a laser wavelength of 658 nm, measurement mode: surface profile mode, measurement pitch: 0.13 μm, and measurement quality: high-speed mode. The average values ​​of the measurements taken at any 10 locations were used as RSm (average length of curved elements), Ra (arithmetic mean roughness), and Rz (maximum height). The RSm, Ra, and Rz of each evaluation sheet, as well as the RSm ratio between the evaluation sheets, are shown in Tables 2 and 3. FIG. 13 shows the relationship between the color difference ΔE and the RSm ratio.

[0211] The 60° specular gloss of the obtained evaluation sheet was measured using a gloss meter ("Microgloss (model name)", manufactured by BYK Gardner) in accordance with JIS K 5600-4-7: 1999. The results are shown in Table 2.

[0212] [Table 2]

[0213] [Table 3]

[0214] As shown in Tables 2 and 3 and Figure 13, it was confirmed that the lighter the color tone of the base, the smaller the RSm of the wrinkle structure, i.e., the finer the wrinkles in the wrinkle structure. It was also suggested that in order to increase the RSm ratio, it is preferable that the color difference ΔE between the filling portion in the first region and the design layer in the second region adjacent to the first region be 40 or more. It is more preferable that the color difference ΔE be 45 or more.

[0215] Thus, the present disclosure provides, for example, the following inventions.

[0216] [1] A decorative sheet having a substrate layer, a design layer, a resin layer, and a matte layer in this order in the thickness direction, the matte layer has a wrinkled structure on a surface opposite to the resin layer, the resin layer has a plurality of recesses on a surface facing the matte layer, the matte layer has a concave shape that conforms to the concave portion of the resin layer, When the decorative sheet is viewed in the thickness direction, a region overlapping with the recess is defined as a first region, and a region not overlapping with the recess is defined as a second region, A decorative sheet, wherein a filler containing a colorant is disposed between the resin layer and the matte layer in the first region.

[0217] [2] A decorative sheet having a resin layer, a design layer, and a matte layer in this order in the thickness direction, the matte layer has a wrinkled structure on a surface opposite to the resin layer, the resin layer has a plurality of recesses on a surface facing the matte layer, the design layer and the matte layer each have a concave shape that follows the concave portion of the resin layer, When the decorative sheet is viewed in the thickness direction, a region overlapping with the recess is defined as a first region, and a region not overlapping with the recess is defined as a second region, A decorative sheet, wherein a filler containing a colorant is disposed between the resin layer and the matte layer in the first region.

[0218] [3] The decorative sheet according to [1] or [2], wherein the wrinkle structure is a structure having irregular wrinkles, and the irregular wrinkles have a convex structure formed by a plurality of protrusions and a concave structure formed by being surrounded by the plurality of protrusions.

[0219] [4] The decorative sheet according to any one of [1] to [3], wherein the depth of the recesses in the matte layer is 10 μm or more.

[0220] [5] When the decorative sheet is viewed in the thickness direction, the recess has a shape extending in a first direction, A decorative sheet according to any one of [1] to [4], wherein the width of the recess is 200 μm or more when the length of the recess in a second direction perpendicular to the first direction is defined as the width of the recess.

[0221] [6] A decorative sheet according to any one of [1] to [5], wherein RSm1 is the average length RSm of the roughness curve elements as defined in JIS B0601:2013 in the wrinkle structure of the first region, and RSm2 is the average length RSm of the roughness curve elements as defined in JIS B0601:2013 in the wrinkle structure of the second region adjacent to the first region, and RSm1 is smaller than RSm2.

[0222] [7] The decorative sheet according to [6], wherein the ratio of RSm2 to RSm1 (RSm2 / RSm1) is 1.5 times or more.

[0223] [8] The decorative sheet according to [6] or [7], wherein the RSm1 and RSm2 are each 100 μm or less.

[0224] [9] When light having a wavelength longer than 320 nm and shorter than 400 nm is irradiated from the matte layer side, the reflectance of the filling portion in the first region is higher than the reflectance of the design layer in the second region adjacent to the first region, A decorative sheet according to any one of [1] to [8], wherein the color difference ΔE between the filling portion in the first region and the design layer in the second region adjacent to the first region is 40 or more.

[0225]

[10] The decorative sheet according to any one of [1] to [9], wherein in the first region, the matte layer has a thickness of 3.0 μm or more and 20 μm or less.

[0226]

[11] The design layer includes a pattern layer having a pattern, The decorative sheet according to any one of [1] to

[10] , wherein the recesses are arranged according to the pattern.

[0227]

[12] The decorative sheet according to [1], wherein a primer layer is disposed between the resin layer and the matte layer.

[0228]

[13] The decorative sheet according to [2], wherein a primer layer is disposed between the design layer and the matte layer.

[0229]

[14] The decorative sheet according to any one of [1] to

[13] , wherein the 60 degree gloss value of the surface of the matte layer facing the wrinkled structure is 10.0 or less.

[0230]

[15] The decorative sheet according to any one of [1] to

[14] , wherein the arithmetic mean roughness Ra as defined in JIS B0601:2013 of the wrinkle structure of the first region and the arithmetic mean roughness Ra as defined in JIS B0601:2013 of the wrinkle structure of the second region adjacent to the first region are each 5.0 μm or less.

[0231]

[16] A decorative sheet according to any one of [1] to

[16] , wherein the maximum height Rz of the wrinkle structure in the first region as defined in JIS B0601:2013 and the maximum height Rz of the wrinkle structure in the second region adjacent to the first region as defined in JIS B0601:2013 are each 15.0 μm or less.

[0232]

[17] A method for producing the decorative sheet according to [1], a laminate preparation step of preparing a laminate having the base layer, the design layer, and the resin layer in this order in the thickness direction; a recess forming step of forming the plurality of recesses on a surface of the resin layer in the laminate opposite to the design layer; a filling portion forming step of filling ink for forming the filling portion into at least a part of the recess and drying the ink to form the filling portion; and a matte layer forming step of forming the matte layer on the surface of the resin layer opposite to the design layer and on the surface of the filling portion opposite to the design layer, after the filling portion forming step. the matte layer forming step includes a wrinkle structure forming process of forming a coating layer by applying a curable resin composition for forming the matte layer, and curing the coating layer by irradiating it with ionizing radiation, thereby forming the wrinkle structure; The method for manufacturing a decorative sheet involves carrying out the above-mentioned irradiation treatment with ionizing radiation in the following order: (1) a first curing treatment by irradiation with light having a wavelength of more than 320 nm and not more than 400 nm; (2) a second curing treatment by irradiation with light having a wavelength of 100 nm or more and less than 200 nm; and (3) a third curing treatment by irradiation with at least one of electron beam irradiation and light having a wavelength of 200 nm or more and not more than 400 nm.

[0233]

[18] [2] A method for producing a decorative sheet according to the present invention, a recess forming step of forming the plurality of recesses on one surface of the resin layer; a design layer forming step of forming the design layer on the one surface side of the resin layer after the recess forming step; a filling portion forming step of filling ink for forming the filling portion into at least a part of the recess after the recess forming step and drying the ink to form the filling portion; and a matte layer forming step of forming the matte layer on the surface of the design layer opposite to the resin layer and on the surface of the filling portion opposite to the resin layer, after the filling portion forming step. the matte layer forming step includes a wrinkle structure forming process of forming a coating layer by applying a curable resin composition for forming the matte layer, and curing the coating layer by irradiating it with ionizing radiation, thereby forming the wrinkle structure; The method for manufacturing a decorative sheet involves carrying out the above-mentioned irradiation treatment with ionizing radiation in the following order: (1) a first curing treatment by irradiation with light having a wavelength of more than 320 nm and not more than 400 nm; (2) a second curing treatment by irradiation with light having a wavelength of 100 nm or more and less than 200 nm; and (3) a third curing treatment by irradiation with at least one of electron beam irradiation and light having a wavelength of 200 nm or more and not more than 400 nm.

[0234]

[19] A decorative material comprising an adherend and the decorative sheet according to any one of [1] to

[16] . [Explanation of symbols]

[0235] 1...Base material layer 2...Design layer 3...Resin layer 4...Matte layer 5...Filling section 6...Primer layer 7...Adhesive layer 10...Decorative sheet 100...Cosmetic materials

Claims

1. A decorative sheet having a substrate layer, a design layer, a resin layer, and a matte layer in this order in the thickness direction, the matte layer has a wrinkled structure on a surface opposite to the resin layer, the resin layer has a plurality of recesses on the surface facing the matte layer, the matte layer has a concave shape that conforms to the concave portion of the resin layer, When the decorative sheet is viewed in the thickness direction, a region overlapping with the recess is defined as a first region, and a region not overlapping with the recess is defined as a second region. A decorative sheet, wherein a filler containing a colorant is disposed between the resin layer and the matte layer in the first region.

2. A decorative sheet having a resin layer, a design layer, and a matte layer in this order in the thickness direction, the matte layer has a wrinkled structure on a surface opposite to the resin layer, the resin layer has a plurality of recesses on the surface facing the matte layer, the design layer and the matte layer each have a concave shape that follows the concave portion of the resin layer, When the decorative sheet is viewed in the thickness direction, a region overlapping with the recess is defined as a first region, and a region not overlapping with the recess is defined as a second region. A decorative sheet, wherein a filler containing a colorant is disposed between the resin layer and the matte layer in the first region.

3. 3. The decorative sheet according to claim 1, wherein the wrinkle structure has irregular wrinkles, and the irregular wrinkles have a convex structure formed by a plurality of protrusions and a concave structure formed by being surrounded by the plurality of protrusions.

4. 3. The decorative sheet according to claim 1, wherein the depth of said recesses in said matte layer is 10 μm or more.

5. When the decorative sheet is viewed in the thickness direction, the recess has a shape extending in a first direction, 3. The decorative sheet according to claim 1, wherein the width of the recess is 200 μm or more, where the length of the recess in a second direction perpendicular to the first direction is the width of the recess.

6. 3. The decorative sheet according to claim 1, wherein RSm1 is the average length RSm of the roughness curve elements as defined in JIS B0601:2013 in the wrinkle structure of the first region, and RSm2 is the average length RSm of the roughness curve elements as defined in JIS B0601:2013 in the wrinkle structure of the second region adjacent to the first region, and RSm1 is smaller than RSm2.

7. 7. The decorative sheet according to claim 6, wherein the ratio of said RSm2 to said RSm1 (RSm2 / RSm1) is 1.5 times or more.

8. The decorative sheet according to claim 6, wherein said RSm1 and said RSm2 are each 100 μm or less.

9. When light having a wavelength longer than 320 nm and shorter than 400 nm is irradiated from the matte layer side, the reflectance of the filling portion in the first region is higher than the reflectance of the design layer in the second region adjacent to the first region, 3. The decorative sheet according to claim 1, wherein a color difference ΔE between the filled portion in the first region and the design layer in the second region adjacent to the first region is 40 or more.

10. 3. The decorative sheet according to claim 1, wherein the thickness of the matte layer in the first region is 3.0 μm or more and 20 μm or less.

11. The design layer includes a pattern layer having a pattern, 3. The decorative sheet according to claim 1, wherein the recesses are arranged in accordance with the pattern.

12. The decorative sheet according to claim 1 , wherein a primer layer is disposed between said resin layer and said matte layer.

13. The decorative sheet according to claim 2 , wherein a primer layer is disposed between the design layer and the matte layer.

14. 3. The decorative sheet according to claim 1, wherein the 60 degree gloss value of the surface of said matte layer facing said wrinkled structure is 10.0 or less.

15. 3. The decorative sheet according to claim 1, wherein the arithmetic mean roughness Ra of the wrinkle structure of the first region, as defined in JIS B0601:2013, and the arithmetic mean roughness Ra of the wrinkle structure of the second region adjacent to the first region, as defined in JIS B0601:2013, are each 5.0 μm or less.

16. 3. The decorative sheet according to claim 1, wherein the maximum height Rz of the wrinkle structure in the first region as defined in JIS B0601:2013 and the maximum height Rz of the wrinkle structure in the second region adjacent to the first region as defined in JIS B0601:2013 are each 15.0 μm or less.

17. A method for producing the decorative sheet according to claim 1, a laminate preparation step of preparing a laminate having the base layer, the design layer, and the resin layer in this order in the thickness direction; a recess forming step of forming the plurality of recesses on a surface of the resin layer in the laminate opposite to the design layer; a filling portion forming step of filling ink for forming the filling portion into at least a part of the recess and drying the ink to form the filling portion; and a matte layer forming step of forming the matte layer on the surface of the resin layer opposite to the design layer and on the surface of the filling portion opposite to the design layer after the filling portion forming step, the matte layer forming step includes a wrinkle structure forming process of forming a coating layer by applying a curable resin composition for forming the matte layer, and curing the coating layer by irradiating it with ionizing radiation, thereby forming the wrinkle structure; The method for manufacturing a decorative sheet includes, in the irradiation treatment with ionizing radiation, (1) a first curing treatment by irradiation with light having a wavelength of more than 320 nm and not more than 400 nm, (2) a second curing treatment by irradiation with light having a wavelength of 100 nm or more and less than 200 nm, and (3) a third curing treatment by irradiation with at least one of electron beam irradiation and light having a wavelength of 200 nm or more and not more than 400 nm, in this order.

18. A method for producing a decorative sheet according to claim 2, a recess forming step of forming the plurality of recesses on one surface of the resin layer; a design layer forming step of forming the design layer on the one surface side of the resin layer after the recess forming step; a filling portion forming step of filling ink for forming the filling portion into at least a part of the recess after the recess forming step and drying the ink to form the filling portion; and a matte layer forming step of forming the matte layer on the surface of the decorative layer opposite to the resin layer and on the surface of the filling portion opposite to the resin layer after the filling portion forming step, the matte layer forming step includes a wrinkle structure forming process of forming a coating layer by applying a curable resin composition for forming the matte layer, and curing the coating layer by irradiating it with ionizing radiation, thereby forming the wrinkle structure; The method for manufacturing a decorative sheet includes, in the irradiation treatment with ionizing radiation, (1) a first curing treatment by irradiation with light having a wavelength of more than 320 nm and not more than 400 nm, (2) a second curing treatment by irradiation with light having a wavelength of 100 nm or more and less than 200 nm, and (3) a third curing treatment by irradiation with at least one of electron beam irradiation and light having a wavelength of 200 nm or more and not more than 400 nm, in this order.

19. A decorative material comprising an adherend and the decorative sheet according to claim 1 or 2.

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