Decorative sheet and decorative plate

1. A decorative sheet comprising a laminate sequentially including a base material sheet, a transparent resin layer, and a surface-protecting layer in the thickness direction, wherein

(1) the decorative sheet has an embossed projection and depression pattern on the surface-protecting layer side,

(2) projections of the embossed projection and depression pattern are rising portions successively connected to depressions, and are projected from a reference plane, the reference plane being a portion of the surface of the surface-protecting layer without the embossed projection and depression pattern,

(3) cross-sectional shapes of the embossed projection and depression pattern have (a) a flat bottom and/or (d) a round bottom with the middle of the depression being roundly broadened, and

(4) the surface of the surface-protecting layer has a maximum profile peak height Rp specified in JIS B0601 (2001) of 30 μm or more.

2. The decorative sheet according to claim 1 , wherein the surface of the surface-protecting layer has a ten-point mean roughness Rzjis specified in JIS B0601 (1994) of 50 μm or more.

3. The decorative sheet according to claim 2 , which satisfies a range of 0.4t≤d≤t, wherein t represents a thickness of the decorative sheet, and d represents a depth of the embossed projection and depression pattern.

4. The decorative sheet according to claim 2 , wherein

1) the surface-protecting layer, when consisting of a single layer, contains fine particles having a particle size greater than the thickness of the single layer, and

2) the surface-protecting layer, when consisting of a multilayer, contains fine particles having a particle size greater than the thickness of the uppermost surface layer of the multilayer.

5. The decorative sheet according to claim 2 , wherein the surface-protecting layer has a total thickness of 15 μm or more.

6. The decorative sheet according to claim 2 , wherein the surface-protecting layer contains an ionizing radiation-curable resin.

7. The decorative sheet according to claim 2 , wherein the base material sheet and the transparent resin layer contain a non-halogen-based thermoplastic resin.

8. The decorative sheet according to claim 2 , wherein the surface of the surface-protecting layer has a ratio of a mean width of roughness profile elements RSm specified in JIS B0601 (2001) to the Rzjis, RSm/Rzjis, of 20 or less.

9. The decorative sheet according to claim 8 , which satisfies a range of 0.4t≤d≤t, wherein t represents a thickness of the decorative sheet, and d represents a depth of the embossed projection and depression pattern.

10. The decorative sheet according to claim 8 , wherein

1) the surface-protecting layer, when consisting of a single layer, contains fine particles having a particle size greater than the thickness of the single layer, and

2) the surface-protecting layer, when consisting of a multilayer, contains fine particles having a particle size greater than the thickness of the uppermost surface layer of the multilayer.

11. The decorative sheet according to claim 8 , wherein the surface-protecting layer has a total thickness of 15 μm or more.

12. The decorative sheet according to claim 1 , which satisfies a range of 0.4t≤d≤t, wherein t represents a thickness of the decorative sheet, and d represents a depth of the embossed projection and depression pattern.

13. The decorative sheet according to claim 1 , wherein

1) the surface-protecting layer, when consisting of a single layer, contains fine particles having a particle size greater than the thickness of the single layer, and

2) the surface-protecting layer, when consisting of a multilayer, contains fine particles having a particle size greater than the thickness of the uppermost surface layer of the multilayer.

14. The decorative sheet according to claim 13 , wherein the fine particles are in a form of a vesicle formed by a supercritical reverse phase evaporation method.

15. The decorative sheet according to claim 1 , wherein the surface-protecting layer has a total thickness of 15 μm or more.

16. The decorative sheet according to claim 1 , wherein the surface-protecting layer contains an ionizing radiation-curable resin.

17. The decorative sheet according to claim 1 , wherein the base material sheet and the transparent resin layer contain a non-halogen-based thermoplastic resin.

18. The decorative sheet according to claim 17 , wherein the non-halogen-based thermoplastic resin is an olefin-based thermoplastic resin.

19. A decorative plate comprising a laminate sequentially including a decorative plate base material and a decorative sheet in the thickness direction, wherein

(1) the decorative sheet comprises a laminate sequentially including a base material sheet, a transparent resin layer, and a surface-protecting layer in the thickness direction,

(2) the decorative sheet has an embossed projection and depression pattern on the surface-protecting layer side,

(3) projections of the embossed projection and depression pattern are rising portions successively connected to depressions, and are projected from a reference plane, the reference plane being a portion of the surface of the surface-protecting layer without the embossed projection and depression pattern,

(4) cross-sectional shapes of the embossed projection and depression pattern have (a) a flat bottom and/or (d) a round bottom with the middle of the depression being roundly broadened, and

(5) the surface of the surface-protecting layer has a maximum profile peak height Rp specified in JIS B0601 (2001) of 30 μm or more.

20. The decorative plate according to claim 19 , wherein the decorative plate base material is at least one member selected from the group consisting of medium-density wood fiberboards, high-density wood fiberboards, particleboards, coniferous tree plywood, broadleaf tree plywood, fast-growing tree plywood, cork sheets, cork-containing composite base materials, and thermoplastic resin base materials.