JPH0452199A - Decorative sheet - Google Patents

Abstract

PURPOSE:To bond a decorative sheet without requiring primary treatment even when there is slight unevenness on the surface of a material to be bonded by providing an intermediate layer between the first and second sticking layers. CONSTITUTION:An abstract pattern is printed on the surface of a colored polyvinyl chloride base material sheet (made by Bando Chemical Co.) having 90mum- thickness by a gravure method to provide a decorative layer 2 and a transparent polyvinyl chloride sheet with 60mum-thickness is thermally welded to the decorative layer 2 as a protective layer. An acrylic resin type two-pack sticking agent is applied to the rear of the base material sheet l in 60mum-thickness by a roll coater and a polyurethane sheet with 2mm-thickness is laminated as an intermediate layer 4. Sticking layers 3A, 3B are also formed on the intermediate layer 4 in the same way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in decorative sheets used as wallpaper, etc.

[Prior Art] Most decorative sheets used for wallpaper and the like are made of a plastic base sheet with a decorative layer on the front surface and an adhesive layer on the back surface. Needless to say, the reason for providing the adhesive layer is to make it easier to apply the decorative sheet to adherends such as walls and building materials.

The thickness of the adhesive layer provided on the decorative sheet is generally 100μ.
m or less, and preferably 60 μ or less. The above-mentioned limits are set because increasing the thickness of the adhesive layer lowers the creep resistance and may cause the base sheet to shift over time.

Among the various materials used as building materials, many have somewhat uneven surfaces, such as wooden boards and concrete boards. Even if a conventional decorative sheet is attached to such materials,
This is inconvenient because the surface of the decorative sheet is coated due to the unevenness of the stone material.

As a countermeasure to this problem, it is possible to thicken the adhesive layer of the decorative sheet to absorb the unevenness of the stone material, but there is the problem of creep resistance mentioned above, and the adhesive layer is not thick enough to absorb the unevenness. You can't create layers.

Therefore, when attaching a decorative sheet to an adherend material whose surface is not smooth, it is necessary to perform ground treatment such as sealing and primer application prior to application. Surface treatment is carried out using various paints, but in addition to the problem of environmental pollution due to organic solvents, time is also required for drying the solvent, which is disadvantageous for shortening the construction period.

[Problem to be Solved by the Invention 1] An object of the present invention is to provide a decorative sheet that can be attached to a stone material without requiring surface treatment even if the surface of the stone has some unevenness.

[Means for Solving the Problems] The decorative sheet of the present invention is provided with: - As shown in the drawings, a decorative layer (2) is provided on the surface of a plastic base sheet (1), and a first layer is provided on the back surface. A pressure-sensitive adhesive layer (3A>), an intermediate layer (4) made of a flexible material, and a second pressure-sensitive adhesive layer (3B) are provided in this order.

The plastic used for the base sheet is typically polyvinyl chloride, but any other plastic that is commonly used as a material for decorative sheets can be used. The thickness of the base sheet is generally 50 to 200 uTrL.

The decorative layer provided on the base sheet is provided with a desired appearance by conventionally known means such as pattern printing, metal vapor deposition, embossing, or lamination of plastic sheets with these applied.

In the example shown in the drawings, a colored solid printing layer (22) and a pattern printing layer (21) are sequentially provided on a base sheet (1).

The adhesive used in the present invention is selected from commonly used adhesives, including acrylic resin-based ones, taking into consideration their compatibility with the stone to be covered. It is easier to form the first and second adhesive layers from the same material, but it goes without saying that they do not have to be the same. An adhesive layer other than the second adhesive layer may be used between the adhesive layers as long as it adheres well between the two.

Any adhesive layer may be formed by a known coating method such as roll coating, and the thickness of the layer is in the range of 5 to 100 μm, preferably 25 to 60 μm.

Any material may be used for the intermediate layer as long as it has a thickness sufficient to absorb the irregularities on the surface of the adherend, is easily deformable, and can be bent. Materials that meet these conditions include, for example, cloth and foamed resin sheets. In particular, cloth is suitable because it has the effect of absorbing irregularities on the surface of the adherend and improving the dimensional stability of the decorative sheet. The thickness of the intermediate sheet depends on the material used and the degree of unevenness on the surface of the adherend, but if a foamed resin sheet is used, the thickness is in the range of 100 μm to 5Ml1+, and if cloth is used, the thickness is in the range of 100 μm to 5 Ml1+. In both cases of woven fabric and non-woven fabric, the thickness is preferably such that the basis weight is in the range of 10 to 15 (1/m).

It is preferable to apply a release paper to the adhesive layer on the back side of the decorative sheet for ease of storage and transportation.

As the release paper, any commonly used release paper, such as various plastic films or papers coated with a release agent such as silicone, may be used.

[Function] By providing an intermediate layer between the first and second adhesive layers, even if it is attached to a stone material with unevenness, the intermediate layer can absorb the unevenness, and the unevenness can be improved. The base sheet is not affected.

[Example] A decorative layer was provided by printing an abstract pattern using a gravure method on the surface of a 90 μm thick colored polyvinyl chloride base sheet (manufactured by Band Kagaku Co., Ltd.), and a 60 μm thick protective layer was placed on top of the decorative layer. A transparent polyvinyl chloride sheet (same as above) was heat-sealed.

An acrylic resin two-component adhesive was applied to the back surface of the base sheet using a roll coater to a thickness of 60 μm, and a 2# thick polyurethane sheet was laminated as an intermediate layer. An adhesive layer was also formed on the intermediate layer in the same manner as above to obtain a decorative sheet of the present invention.

[Effect of the Invention 1] The decorative sheet of the present invention can give a beautiful appearance even when attached to an adherend that has not been subjected to surface treatment. Eliminating the need for surface treatment of the adherend material not only shortens the construction period, but also eliminates the problem of environmental pollution associated with surface treatment using paint.

[Brief explanation of the drawing]

The drawings are for explaining an example of the decorative sheet of the present invention.
FIG. 3 is a schematic cross-sectional view. 1... Base material sheet 2... Decorative layer 3A,
3B... Adhesive layer 4... Intermediate layer patent applicant
Dai Nippon Printing Co., Ltd. Representative Patent Attorney Souo Suga

Claims (3)

[Claims] (1) A decorative sheet in which a decorative layer is provided on the front surface of a plastic base sheet, and a first adhesive layer, an intermediate layer made of a flexible material, and a second adhesive layer are provided in this order on the back surface. (2) The decorative sheet according to claim 1, wherein the intermediate layer is a sheet of cloth or foamed resin. (3) The decorative sheet according to claim 1, wherein a release paper is applied to the adhesive layer on the back side.