TECHNICAL FIELD

The present invention relates to a decorative sheet and a decorative plate.

BACKGROUND ART

Conventionally, decorative sheets are laminated on the surface of various articles in order to impart designability. For example, decorative sheets are laminated and used on the surface of wall-covering materials used for wall surfaces of buildings and floor decorative materials used for floors.

In using such decorative sheets in living environments, dirt accumulates due to the adherence of fine particle powder as a result of, for example, the spilling of a daily used contaminant, such as wheat flour. In particular, dirt made with daily-used fine particle powders mostly has a white color and is noticeable. Such dirt made with a powder adhering to the decorative sheet surface is a problem in that it is not easily removed by cleaning since the powder is fine and easily penetrates into irregularities on the decorative sheet surface.

To solve this problem, a decorative sheet is disclosed whose surface irregularities are specified so that the contaminant above does not easily enter recesses, thereby preventing a decrease in easy cleanability (a property referring to the ability to be easily cleaned) (Patent Literature (PTL) 1).

CITATION LIST

Patent Literature

PTL 1: JP2014-69507A

SUMMARY OF INVENTION

Technical Problem

Although the decorative sheet above has excellent, easy cleanability, there is still room for further improvement in easily removing dirt due to the adherence of fine particle powder.

When using decorative sheets in living environments, scratches may be formed due to the impact applied when an article is dropped onto the surface of the decorative sheet. For this reason, decorative sheets are required to have impact resistance.

Accordingly, for use in living environments, the development of a decorative sheet has been in demand that has excellent, easy cleanability and excellent impact resistance and from which dirt due to the adherence of a daily used contaminant, such as fine particle powder, that is not particularly easy to clean is easily removed.

An object of the present invention is to provide, for use in living environments, a decorative sheet that has excellent, easy cleanability and excellent impact resistance and from which dirt due to the adherence of a daily used contaminant, such as fine particle powder, that is not easy to clean is easily removed.

Solution to Problem

As a result of extensive research, the present inventor found that the above object can be achieved when a decorative sheet has, on its uppermost surface, a surface-protecting layer, and when the surface of the surface-protecting layer has a specific shape. The present invention has thus been completed.

More specifically, the present invention relates to the following decorative sheet.

1. A decorative sheet having a surface-protecting layer on the uppermost surface of the decorative sheet, wherein(1) Ra(i)/Ra(ii) is 0.62 or more and 1.63 or less, the Ra(i)/Ra(ii) being calculated using an arithmetic average roughness Ra(i) measured along an arbitrary direction on the surface of the surface-protecting layer, and an arithmetic average roughness Ra(ii) measured along the perpendicular direction to the arbitrary direction, under measurement conditions in accordance with JIS B0633:2001 and by a measurement method in accordance with JIS B0601:2001;(2) RSm(i)/RSm(ii) is 0.75 or more and 1.33 or less, the RSm(i)/RSm(ii) being calculated using a mean width of roughness profile elements RSm(i) measured along an arbitrary direction on the surface of the surface-protecting layer, and a mean width of roughness profile elements RSm(ii) measured along the perpendicular direction to the arbitrary direction, under measurement conditions in accordance with JIS B0633:2001 and by a measurement method in accordance with JIS B0601:2001; and(3) an arithmetic average roughness Ra measured on the surface of the surface-protecting layer at a cutoff value (λc) of 0.08 mm with an evaluation length of 0.4 mm by a measurement method in accordance with JIS B0601:2001 is 0.40 μm or less, and a mean width of roughness profile elements RSm measured on the surface of the surface-protecting layer at a cutoff value (λc) of 0.08 mm with an evaluation length of 0.4 mm by a measurement method in accordance with JIS B0601:2001 is 22.90 μm or more.

2. The decorative sheet according to Item 1, wherein a resin constituting the surface-protecting layer is an ionizing radiation-curable resin.

3. The decorative sheet according to Item 1 or 2, wherein the surface-protecting layer contains an inorganic filler.

4. The decorative sheet according to Item 3, wherein the inorganic filler is at least one member selected from the group consisting of silica, alumina, and glass powder.

5. The decorative sheet according to any one of Items 1 to 4, further having a gloss-adjusting layer.

6. A decorative plate having an adherend on a surface opposite to the surface-protecting layer of the decorative sheet of any one of Items 1 to 5.

Advantageous Effects of Invention

For use in living environments, the decorative sheet of the present invention is easily cleaned to remove dirt due to the adherence of fine particle powder as a result of, for example, the spilling of a daily used contaminant, and has excellent, easy cleanability and excellent impact resistance. Therefore, the decorative sheet of the present invention is suitably used, in particular, for floors.

