JPH0420045Y2 - - Google Patents

Description

[Detailed explanation of the idea]

Purpose of invention

[Industrial application field]

This invention relates to the improvement of decorative sheets, which have excellent surface properties such as scratch resistance, solvent resistance, stain resistance, weather resistance, and abrasion resistance, and can also be used to form curved surfaces such as single wraps of wood and V-cuts. To provide a decorative sheet with a superior design.

[Conventional technology]

Various decorative sheets as described below are used as wallpaper or as materials for manufacturing decorative laminates, but each has its own drawbacks. That is, the most common decorative sheet using polyvinyl chloride on the surface has poor stain resistance and weather resistance. Decorative sheets are made by coating paper with a thermosetting or two-component curing resin such as urethane resin or amino alkyd resin as a top coat, and are stain resistant, weather resistant,
Poor surface properties such as solvent resistance. This decorative sheet has low strength and is not suitable for forming curved surfaces such as wood end wraps and V-cuts. If this decorative sheet is applied to plywood or the like and then reapplied with aminoalkyd resin, etc., the reapplying process and curing take time, resulting in high costs. Based on the idea of strengthening the surface of a decorative sheet with an ionizing radiation-curable resin, a prototype decorative sheet was produced by coating paper or nonwoven fabric with an ultraviolet-curable resin. However, although the surface of this decorative sheet has excellent physical properties such as scratch resistance, solvent resistance, stain resistance, weather resistance, and abrasion resistance, some of the UV-curable resin penetrates into the paper or nonwoven fabric. Since it is difficult to harden even when exposed to ultraviolet rays, it tends to become sticky on the back side of the paper or nonwoven fabric, resulting in poor adhesion to walls, plywood, etc.

[Problem that the invention attempts to solve]

The purpose of this invention is to improve the above-mentioned drawbacks of decorative sheets, and to improve scratch resistance, solvent resistance, stain resistance, weather resistance,
To provide a highly designed decorative sheet that has excellent surface properties such as abrasion resistance, has good adhesion to walls and plywood, and is suitable for forming curved surfaces such as wood end wraps and V-cuts. be. Structure of the idea

[Means to solve the problem]

The decorative sheet of the present invention will be described with reference to the drawings. A pattern printing layer 2, an adhesive layer 3, a plastic film 4, and an ionizing radiation-cured resin layer 5 are laminated on a base material 1 made of paper or nonwoven fabric. It will be done. If desired, a plastic film with an embossed surface is used. The embossing method is a roll embossing method using an embossing roll,
A press embossing method using an embossing plate, a high frequency embossing method, etc. may be used as desired. As the paper used for the base material, thin paper, kraft paper, high-quality paper, titanium paper, linter paper, paperboard, gypsum board paper, latex-impregnated paper, paper mixed with synthetic resin, etc. can be used. As a non-woven fabric, the basis weight is 15~
A nonwoven fabric made of a material such as polypropylene and having a weight of 120 g/m ² , preferably 15 to 65 g/m ² can be used. A nonwoven fabric impregnated with a synthetic resin to improve interlaminar strength may also be used. The printing layer of the pattern is printed using regular printing ink.
It may be provided by gravure or any other printing method. If the adhesive is used using the dry lamination method,
Thermoplastic resins such as rubber and acrylic resins, thermosetting resins such as acrylic resins, epoxy resins, and urethane resins are used. When performing wet lamination, a rubber emulsion type, a vinegar-acrylic resin emulsion type, an epoxy resin emulsion type, etc. are used. For the adhesive layer, use the above adhesive. It is formed by coating by any method such as roll coating. The lamination method is not limited to the method using the above adhesive. An adhesive method is used in which a urethane resin anchor coat is applied to the back side of the plastic film, then an extrusion coat is applied to a polyolefin resin such as polyethylene or polypropylene, and this is laminated to the base material as an adhesive. good. Plastic films include polyester, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polycarbonate,
A film made of nylon, polystyrene, ethylene-vinyl alcohol copolymer, etc. and having a thickness of 3 to 200 microns, preferably about 9 to 38 microns, can be used. Particularly preferred is an ethylene-vinyl alcohol copolymer film. This film has good solvent resistance, so even if the ionizing radiation-curable resin is diluted with a solvent and applied, the film will not dissolve, and the curing of the resin will not be hindered, making it possible to obtain a strong surface. . As the ionizing radiation curable resin, unsaturated polyester, polyether acrylate, polyester acrylate, epoxy acrylate, urethane acrylate, spiroacetal acrylate, polybutadiene resin, polythiol polyene resin, etc. can be used. Furthermore, to improve curability and hardness, difunctional monomers such as neopentyl glycol diacrylate, tripropylene glycol diacrylate, diethylene glycol diacrylate, 1,6 hexadiol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, etc. A mixture of trifunctional monomers such as acrylate and dipentaerythritol hexaacrylate, or a polyfunctional monomer of more than that can be used. These resins can be sufficiently cured by electron beams, but when curing by ultraviolet irradiation, acetophenones, benzophenone, Michler's ketone, benzoin, benzyl methyl ketal, benzoyl benzoate, α-acyloxime ester are used as photoinitiators. , tetramethylthiuram monosulfide, thioxane phosphorus, etc., and further, as a sensitizer, n-butylamine, triethylamine, tri-n-butylphosphine, etc. are used. In addition to the above, silicone-based curable resins include partial hydrolysates of aminosilanes and epoxysilanes, silane coupling agents, alkyltrialkoxysilanes, partial hydrolysates of tetraalkoxysilanes, and hydrolysates of alkyltrialkoxysilanes. can be used. The ionizing radiation-curable resin layer is formed by applying an ionizing radiation-curable resin diluted with a solvent using methods such as flow coating, roll coating, or gravure coating, and heating it to scatter the solvent to form a solid film. do. The thickness is 1 to 20μ, preferably 1 to 20μ
Approximately 5μ is good. Typical examples of ionizing radiation are electron beams and ultraviolet rays. The former is emitted from various electron beam accelerators,
Electron beams with energies in the range 50-1000 KeV, preferably 100-300 KeV are used, the latter being
Use a high-pressure mercury lamp or other ultraviolet light source. Providing an adhesive layer or an adhesive layer with a release paper on the back side of the substrate is convenient for use as wallpaper or a decorative sheet used in the production of decorative laminates. A preferred adhesive is polyethylene vinyl acetate, which has good adhesive properties.
If desired, a plasticizer or a pigment that imparts hiding performance may be mixed with the adhesive. The adhesive layer can be formed to a thickness of 5 to 100 mm by any method such as roll coating.
g/m ² , preferably about 20 to 30 g/m ² . Commonly used adhesives and release paper may be used.

[Effect]

The decorative sheet of the present invention has a plastic film between the base material made of paper or nonwoven fabric and the ionizing radiation-cured resin layer, so the resin does not penetrate into the base material, and when irradiated with ionizing radiation, the resin is completely cured. harden. Therefore, the back side of the base material will not become sticky and cause poor adhesion to walls, plywood, etc.

[Example 1] On thin paper "DB-40" (Tenma Tokushu Paper Co., Ltd.) with a basis weight of 40 g/ ^m2 , a wood grain pattern was gravure-printed using ink "MA" (Moroboshi Ink) with a nitrocellulose vehicle. Prepare printed paper. On top of this, polyethylene resin is coated to a thickness of 20μ using the extrusion coating method, and a 25μ thick film of partially saponified ethylene vinyl acetate copolymer “EVAL E25” (Kuraray) is laminated with the surface subjected to corona discharge treatment. did. Furthermore, on top of this, an ultraviolet curable resin "Seikabeam PHC" (Dainichiseika Industries) was applied to a thickness of 2 μm.
The ultraviolet curable resin layer was crosslinked and cured by passing under a high-pressure mercury lamp (ozone type) 80 W/cm2 lamp at a speed of 5 m/min. The obtained decorative sheet has scratch resistance (by steel wool #0000 rubbing test), solvent resistance,
It had excellent surface properties such as stain resistance, weather resistance, and abrasion resistance, and had a high design quality.

[Example 2] A printing paper was prepared in which a wood grain pattern was gravure printed using the same ink as in Example 1 on thin paper "Hard Sheet 23" (Shirakawa Paper Industries) with a basis weight of 23 g/m ² . Next, a 25μ thick polyester film “T-
60'' (Toray), the same ultraviolet curable resin as in Example 1 was applied to a thickness of 3 μm, and the ultraviolet curable resin layer was crosslinked and cured under the same conditions as in Example 1. The printed side of the above printing paper and the back side of the polyester film are bonded with polyurethane adhesive "Takenate".
(Takeda Pharmaceutical) was used to dry laminate. The obtained decorative sheet had the same performance as Example 1. Effects of the invention The decorative sheet of this invention has scratch resistance, solvent resistance,
It has excellent surface properties such as stain resistance, weather resistance, and abrasion resistance, and is also suitable for forming curved surfaces such as wood end wraps and V-cuts, and has a high design value. In the embodiment in which embossing is applied, the design quality is further enhanced. An embodiment in which an adhesive layer or a pressure-sensitive adhesive layer with a release paper is provided on the back side is convenient for use as a decorative sheet used in the production of wallpaper or decorative board.

[Brief explanation of drawings]

The drawing is a schematic cross-sectional view showing the structure of the decorative sheet of the present invention. DESCRIPTION OF SYMBOLS 1... Base material, 2... Pattern printing layer, 3... Adhesive layer, 4... Plastic film, 5... Ionizing radiation curable resin layer.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A decorative sheet comprising a base material 1 made of paper or nonwoven fabric, a pattern printed layer 2, an adhesive layer 3, a plastic film 4, and an ionizing radiation-cured resin layer 5 laminated thereon. . (2) The decorative sheet according to claim 1, which uses an ethylene vinyl alcohol copolymer film as the plastic film. (3) A decorative sheet according to claim 1 of the utility model registration claim, which uses a plastic film with an embossed surface. (4) The decorative sheet according to claim 1, wherein the ionizing radiation-curable resin layer is made of an ultraviolet-curable resin. (5) The decorative sheet according to claim 1 of the utility model registration claim, which has an adhesive layer on the back side of the base material or has an adhesive layer covered with release paper.