JPH11198301A - Decorative sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet excellent in weatherability and capable of developing a wide range of design effect. SOLUTION: A pattern layer 3 is provided to the single surface of a sheet like base material 1 comprising a paper base material or a plastic sheet through a primer layer 2 and, subsequently, a surface layer 4 is provided on the pattern layer 3 by using a thermally molten resin based on a fluoroplastic resin and, further, fine ueven patterns 5 are partially or wholly provided on the surface layer 4. Since the surface layer is provided from the resin based on the fluoroplastic resin, this decorative sheet is excellent in antistaining properties, chemical resistance and non-stickiness and, by using the plastic sheet or paper as the sheet like base material, a wide range of design effect can be provided by applying the printing of a design or a pattern on the sheet like base material. Since a resin of printing ink is used so as to impart flexibility, even if a decorative sheet is laminated to wooden plywood and bent in order to perform V-cut processing, the ink layer of the decorative sheet is not peeled and no crack is generated in the decorative sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet used as a surface material for interior wall materials, door materials, other furniture materials, kitchen equipment, home electric appliances and the like.

[0002]

2. Description of the Related Art Conventionally, as a decorative sheet for ordinary building materials, an appropriate pattern layer such as a grain pattern is applied on a titanium paper-based paper base material (thin paper), and a clear top coat layer is formed thereon. There is used one provided with a clear top coat layer after applying a synthetic resin paste such as vinyl chloride. In addition, for example, on a plastic sheet mainly composed of a vinyl chloride resin, an appropriate pattern layer such as a wood pattern is applied, and a top sheet mainly composed of a vinyl chloride resin is laminated thereon, and further a clear top coat layer is formed. A decorative sheet provided with is also known.

On the other hand, as a stain-resistant decorative sheet, for example, an appropriate pattern layer such as a wood pattern is provided on a plastic sheet mainly composed of a vinyl chloride resin, and a film mainly composed of a fluorine-based resin is formed on the pattern layer. For example, a laminate of an ethylene-tetrafluoroethylene copolymer is known. This type of decorative sheet is used after being laminated on a wooden substrate or a metal substrate.

[0004]

As described above, a conventional decorative sheet can be easily formed on a sheet-like substrate such as a paper substrate (thin paper) such as titanium paper or a plastic sheet mainly composed of vinyl chloride resin. Since it can be decorated, it is possible to freely select designs and designs such as an appropriate pattern layer such as a wood grain pattern or an abstract pattern, but different lamination conditions must be set depending on the material of the sheet-like base material, and the surface It is difficult to set the lamination conditions because of the conditions for providing the fine irregularities partially.

[0005] Concerning the stain resistance, when a normal decorative sheet is laminated with a top sheet mainly composed of, for example, a vinyl chloride resin and a clear top coat layer is formed thereon, the clear top coat layer is not used. Although the surface stain resistance has some effect,
When the surface is contaminated with an oil-based ink or a petroleum-based solvent, the stain resistance of the surface is still incomplete so that it is impossible to remove the stain by wiping. In addition, by applying a clear coat on the entire surface, the design properties such as the matte feeling of the fine irregularities formed on the surface have been impaired.

Further, since the above-mentioned conventional stain-resistant decorative sheet uses a sheet mainly composed of a thermoplastic resin such as, for example, a vinyl chloride resin, heat resistance may be insufficient depending on a portion to be used. there were. For example, it is a product around a fire such as a kitchen appliance part such as a range hood or a top plate. Therefore, for such applications, a fluorine-based resin-coated steel sheet in which a colored paint is applied to a steel sheet and a fluorine-based resin film is adhered is commercially available. However, fluororesin-coated steel sheets are inferior in design because they cannot express designs freely in terms of painting, and differed, for example, by dispersing metal powder such as brass or aluminum powder in paint. Although it is possible to express a design, it is not possible to express a high design that is synchronized with a printed pattern. Further, the fluororesin-coated steel sheet has poor workability due to the structure of the coating film, and cracks and peels off when formed three-dimensionally.

[0007] The present invention has been made in view of the above background, and an object of the present invention is to provide a decorative sheet having excellent stain resistance and exhibiting a wide range of design properties.

[0008]

In order to solve the above-mentioned problems, a decorative sheet of the present invention is provided with a pattern layer made of a curable resin ink on one surface of a sheet-like substrate made of a paper substrate or a plastic sheet. , A surface layer is provided by a resin mainly composed of a fluorine-based resin melted from the top of the pattern layer,
Further, a fine uneven pattern is provided partially or entirely.

[0009]

FIG. 1 is a sectional view showing one embodiment of a decorative sheet according to the present invention. In one embodiment of the decorative sheet of the present invention, as shown in FIG. 1, a pattern layer 3 is provided on one side of a sheet-like substrate 1 made of a paper substrate or a plastic sheet via a primer layer 2, and then the pattern layer is provided. Surface layer 4 made of a resin mainly composed of a fluorine resin melted from above 3
, And the fine uneven pattern 5 is provided partially or entirely.

As a paper base material, a basis weight of 10 to 120 g / m
^2. Thin paper (with a thickness of about 70 to 80 μm) impregnated with a resin emulsion, and has an elongation of at least 6% or more due to mechanical tensile force in a transverse direction perpendicular to the grain direction (longitudinal direction). (About 6-8%), grain direction (vertical direction)
The elongation by the same tensile force is 1% or more (about 1 to 2%), and the tensile strength in the paper width direction is at least 3%.
It is desirable to have a performance of kgf / cm or more.

The picture layer formed on the paper substrate is composed of one or more multi-layered printing layers, for example, a transparent or translucent printing ink of a suitable color such as white or red. It is composed of a solid ink layer and a pattern ink layer made of a printing ink of an appropriate color tone such as transparent or translucent, or white or red, formed on the solid ink layer.

The solid ink layer is formed in a solid shape on the paper base layer using, for example, a white ink and also as a hiding layer, and the pattern ink is formed on the solid ink layer by printing a wood grain pattern (one or more colors). A layer is formed. When thin paper mixed with titanium oxide is used for the paper substrate, the solid ink layer may be omitted and only the pattern ink layer may be formed by printing.

As a printing ink, a decorative sheet using a paper base material is laminated on a substrate to form a decorative plate, and when the decorative plate is bent by V-cut processing, the ink layer does not peel off. It is necessary to select an ink resin that has good adhesiveness to the paper base material and imparts flexibility to the entire decorative sheet so that cracks and cracks do not occur in the layer.

The printing ink is used by mixing a polyol resin (or a polyamine resin or a polycarboxylic acid resin) and an isocyanate as a resin (vehicle) for appropriately dispersing a pigment immediately before printing on a paper substrate. And a urethane-based (or polyamine-based or polycarboxylic acid-based) two-component curing type having a urethane bond. Two-component curable printing inks urethane has a hydroxyl (-OH) alkyd resin with an acrylic resin, cellulose derivative resin, a polyol resin such as polyvinyl alcohol, polyamines having an amino group (-NH _2), carboxyl group ( -COOH) and a resin having active hydrogen such as a polycarboxylic acid having an isocyanate group (-
NCO) is mixed with a polyisocyanate resin immediately before printing to be used as one liquid. After printing, the printing ink is at room temperature by crosslinking polymerization of a hydroxyl group (-OH) and an isocyanate group (-NCO). Is cured and dried.

Other two-part curable printing inks include:
An alkyd resin having a hydroxyl group (-OH), an acrylic resin or a resin such as nitrocellulose or polyvinyl alcohol is mixed with a polyvinyl chloride-polyvinyl acetate copolymer, and thereafter, an isocyanate group (-NCO) is mixed. You may use range isocyanate, methylene diisocyanate, and hexamethylene diisocyanate.

In the above two-part curable printing ink, an alkyd resin having a hydroxyl group (-OH), an acrylic resin, a cellulose derivative resin, a polyol resin such as polyvinyl alcohol, a polyamine having an amino group (-NH ₂ ), The proportion of the resin having an active hydrogen such as a polycarboxylic acid having a group (—COOH) and the polyisocyanate resin having an isocyanate group (—NCO) may be, for example, a polyol resin in order to impart flexibility to the ink layer. It is suitable to mix the resin mainly composed of isocyanate with about 5 to 20 parts by weight with respect to 80 to 95 parts by weight of the resin, but there is no particular limitation as long as the flexibility of the ink layer is obtained.

As the plastic sheet, a sheet made of various resins such as vinyl chloride, PET (polyethylene terephthalate) and polyolefin resin can be used. The pattern layer formed on the plastic sheet is composed of one or more multi-layered printing layers, for example, a transparent or translucent, or a solid ink layer of a printing ink of an appropriate color such as white or red. , Transparent or translucent formed on the upper side, or white,
It is composed of a pattern ink layer made of a printing ink having an appropriate color tone such as red.

As the printing ink, any resin can be used as long as it has an adhesive property to the plastic sheet. For example, polyester resins, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, methyl methacrylate and alkyl methacrylate (however, the carbon number of the alkyl group is (2 to 6) copolymers, such as acrylic resins, polystyrene, polyamide resins, polyacetal resins such as polyvinyl butyral and polyvinyl acetal, polyurethane resins, epoxy resins, petroleum resins, methylcellulose, ethylcellulose, acetylcellulose, and cellulose acetate butyrate. And cellulose derivatives such as nitrocellulose.

The printing ink for forming the picture layer may be a resin (vehicle) in which a pigment is appropriately dispersed, in addition to the resins mentioned in the printing ink, such as a polyol resin (or a polyamine resin or a polycarboxylic acid resin) and an isocyanate. Are used immediately before printing on a plastic sheet, and a two-part curable urethane-based (or lamine-based or polycarboxylic acid-based) type having a urethane bond is used. Two-component curable printing inks of the urethane has a hydroxyl (-OH) alkyd resin with an acrylic resin, cellulose derivative resin, a polyol resin such as polyvinyl alcohol, polyamines having an amino group (-NH _2), carboxyl group A resin having active hydrogen such as a polycarboxylic acid having (-COOH) and a polyisocyanate resin having an isocyanate group (-NCO) are mixed immediately before printing and used as one liquid,
After printing, the printing ink is cured and dried at room temperature by crosslinking polymerization of a hydroxyl group (-OH) and an isocyanate group (-NCO).

The picture layer (such as wood grain pattern) is formed by, for example, intaglio printing such as gravure printing, flat plate printing such as offset printing, letterpress printing, flexographic printing, and perforated plate printing such as screen printing. Can be formed by a known printing method. In addition, if only coloring is desired, a known coating method such as roll coating, gravure coating, spray coating, dip coating, solid coating, and slide coating can be used.

As the fluororesin, an ethylene-tetrafluoroethylene copolymer or polytetrafluoroethylene is used. Then, the resin mainly composed of the fluorine-based resin is heated to a melting point or higher, and as shown in FIG. 2, a base material (paper base or plastic sheet) 13 is passed between the pressure roll 11 and the embossing roll 12. By extruding the heated and molten resin from a lip of a die 14 made of a steel material having no corrosive property with respect to a resin mainly composed of a fluororesin, the surface layer 15 is formed on the base material 13 at the same time. Embossing roll 12 also serving as cooling roll
Forms a fine uneven pattern on the surface layer 15. When a resin mainly composed of a fluororesin is heated to a melting point or higher, a hot wire heater is used. For example, when the resin is an ethylene-tetrafluoroethylene copolymer, a temperature of 260 ° C.
It is preferable to carry out extrusion coating by heating as described above and at an apparent viscosity of 1000 to 10000 cps at a shear rate of 10 to 1000 (1 / second).

FIG. 3 shows an example of a pattern formed on the surface layer. In this example, fine irregularities 21 such as satin and flat portions 22 such as a mirror surface are formed in a checkered pattern. The fine concavo-convex pattern constituting the fine concavo-convex portion 21 is formed by the embossing roll 12 used at the time of extrusion lamination, but may be provided partially as in this example or may be provided entirely.

[0023]

Embodiments of the present invention will be described below in detail.

(Example 1) A thin paper having a basis weight of 30 g / m ² (about 70 to 80 μm in thickness) is impregnated with a resin emulsion, and the thin paper is machined in a transverse direction perpendicular to the grain direction (longitudinal direction). At least 6% elongation due to typical tensile force
(6 to 8%), the elongation by the same tensile force in the paper grain direction (longitudinal direction) is 1% or more (1-2%), and the tensile strength in the paper width direction is at least 3 kgf / cm. The provided paper substrate was used as a sheet substrate. The paper substrate was provided with a wood grain pattern layer.

Next, the resin of the ethylene-tetrafluoroethylene copolymer is heated to a melting point (260 ° C.) or higher by a hot wire heater, and at a shear rate of 10 to 1000 (1 / sec),
When the apparent viscosity is in the range of 1,000 to 10,000 cps, the surface layer is extruded from the lip of a non-corrosive steel die over the pattern layer, and the surface layer is laminated on the paper base material. Was provided with a fine uneven pattern. Thus, a decorative sheet having stain resistance was obtained.

Example 2 A polyethylene terephthalate sheet having a thickness of 25 μm was used as a sheet-like base material, and a solid ink layer was formed on one surface thereof using a two-component curable translucent white ink, and an abstract pattern was further formed thereon. The picture layer was formed by gravure printing with two colors. Thereafter, in the same manner as in Example 1, a decorative sheet having stain resistance was obtained.

[0027]

As described above, the decorative sheet of the present invention is provided with a surface layer made of a resin mainly composed of a fluorine-based resin, and therefore has excellent stain resistance, chemical resistance, and non-adhesiveness. Even if the surface is contaminated by using it on a portion where dirt is likely to adhere, the dirt can be easily removed by wiping with water or a detergent solution.

Also, by using a plastic sheet or paper such as vinyl chloride for the sheet-like base material,
A wide range of design properties can be provided by directly printing a design or design on a sheet-like base material.

Furthermore, since the printing ink resin which gives flexibility is used, the decorative sheet is laminated on a wood-based plywood or the like, and the ink layer of the decorative sheet is bent even when performing a V-cut process. There is no peeling or cracking.

Further, a stain-resistant decorative sheet can be obtained without setting the conditions for laminating each of the plastic sheet and the paper substrate, and at the same time, it is possible to impart a design with fine irregularities to the surface. Furthermore, by adding a pigment at the time of film formation with a resin mainly composed of a fluorine-based resin, a new design property intertwined with the pattern layer can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a decorative board according to the present invention.

FIG. 2 is an explanatory diagram showing how a surface layer is laminated.

FIG. 3 is an explanatory view showing a pattern example of a fine uneven pattern provided on a surface layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet-shaped base material 2 Primer layer 3 Picture layer 4 Surface layer 5 Fine uneven pattern 11 Pressure roll 12 Emboss roll 13 Base material 14 Dice 15 Surface layer 21 Fine uneven part 22 Flat part

Claims (2)

[Claims] An image layer is provided on one side of a sheet-like substrate made of a paper substrate or a plastic sheet with a curable resin ink, and a resin mainly composed of a fluorine-based resin melted from the image layer by heat. A decorative sheet provided with a surface layer and further partially or entirely provided with a fine uneven pattern. 2. The decorative sheet according to claim 1, wherein the fluororesin is an ethylene-tetrafluoroethylene copolymer or polytetrafluoroethylene.