JP6753504B2 - Transparent resin film, decorative board, and method for manufacturing decorative board - Google Patents

Description

The present invention relates to a transparent resin film, a decorative board made of the transparent resin film, and a method for producing the decorative board.

In recent years, due to the widespread use of inkjet printing methods using inkjet printers, even decorative sheets used for building materials, decorative molded products, etc. can handle a wide variety of products in small lots and have complicated patterns (characters, It became possible to print numbers and figures.
Furthermore, the inkjet printing method has an advantage that the substrate to be printed is not limited to a film, and can be printed on a substrate having a flat plate, unevenness, or a curved surface.
However, since the pattern layer printed by the inkjet printing method is usually on the outermost surface of the base material, the surface performance such as scratch resistance, stain resistance, and weather resistance is insufficient, and the pattern layer is protected. It was necessary to laminate a transparent resin film on the surface of the pattern layer.
As such a transparent resin sheet, for example, in Patent Document 1, an overcoat provided with a protective layer on one surface and an adhesive layer on the other surface of transparent polypropylene containing a triazine-based ultraviolet absorber and a hindered amine-based light stabilizer. Laminated films are disclosed.

However, when the conventional transparent resin film is laminated with the pattern layer provided on the base material, air is caught between the pattern layer provided on the base material and the transparent resin film. Even if there is, since the amount of change in the gloss of the surface of the transparent resin film is small, it is difficult to visually judge whether or not it is biting air, and if it is biting air, the pattern layer and transparency A decrease in the adhesion with the resin film may be a problem.

Japanese Unexamined Patent Publication No. 2005-120255

The present invention provides a transparent resin film whose adhesion state can be visually confirmed when laminated on a pattern layer provided on a base material, a decorative plate made of the transparent resin film, and a method for producing the decorative plate. The purpose is.

As a result of diligent studies to solve the above-mentioned problems, the present inventors have made an external haze layer on the surface laminated on the pattern layer of the base material with respect to the transparent resin film, thereby providing the surface of the pattern layer of the base material. When a transparent resin film is laminated on the surface, it can be easily visually determined whether or not it is biting air, and those whose adhesion to the pattern layer is reduced due to biting air are excluded. As a result, it has been found that a transparent resin film can be easily made to have excellent adhesion to the pattern layer, and the present invention has been completed.

The present invention is a transparent resin film for protecting the pattern layer laminated on one of the base materials, and the transparent resin film is at least on the side where the thermoplastic resin layer and the pattern layer are laminated. It is a transparent resin film having an outer haze layer and having a haze value of 4% or more and less than 100% of the outer haze layer.

In the transparent resin film of the present invention, a polyethylene terephthalate film having a haze value of 0.1% or less is attached to the opposite side of the outer haze layer to the thermoplastic resin layer side via a pure water layer, and the thermoplastic resin layer is attached. The haze value when the back surface measured from the side is wet is preferably 90% or less.
Further, in the transparent resin film of the present invention, the thickness of the outer haze layer is preferably 0.5 μm or more and 20 μm or less.

The present invention is also a decorative board, which comprises, in order in the thickness direction, a base material, a pattern layer, and the transparent resin film of the present invention.
Further, the present invention is the above-mentioned method for manufacturing a decorative board, wherein an adhesive layer is formed on the surface on the side where the pattern layer of the transparent resin film is laminated, and the above-mentioned via the adhesive layer. It is also a method for manufacturing a decorative board, which comprises a step of bonding a transparent resin film and the above-mentioned pattern layer.

Since the transparent resin film of the present invention has an outer haze layer having a predetermined haze value on the surface laminated on the pattern layer of the base material, when the transparent resin film is laminated on the surface of the pattern layer of the base material, , Whether or not it is biting air can be easily determined visually, and by excluding those whose adhesion to the pattern layer is reduced due to biting air, adhesion to the pattern layer is excluded. Is easy to make excellent.
The decorative board of the present invention formed by laminating such a transparent resin film of the present invention on the surface of the pattern layer of the base material and the decorative board obtained by the method for producing the decorative board of the present invention are transparent with the pattern layer. It can be easily made in a state where air is not caught between the resin film and the resin film, and these adhesions can be easily made excellent.

It is a schematic diagram which shows the cross section of a preferable example of the transparent resin film of this invention. It is a schematic diagram which shows the cross section of another preferable example of the transparent resin film of this invention. It is a schematic diagram which shows the cross section of a preferable example of the decorative board of this invention.

A preferred example of the transparent resin film of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the transparent resin film 10 of the present invention has at least a thermoplastic resin layer 11 and an outer haze layer 12.
The thermoplastic resin layer is a layer that plays a role of protecting the pattern layer laminated on one surface of the base material described later. Such a thermoplastic resin layer may be translucent or colored as long as the pattern layer is visible as long as it is transparent.
The thermoplastic resin constituting the thermoplastic resin layer includes one or more of the following resins, for example, olefin resins such as polyethylene, polypropylene, polybutene, polymethylpentene, and olefin-based thermoplastic elastomers, and polyethylene terephthalate. , Polybutylene terephthalate, polyethylene narefurate, ethylene glycol-terephthalic acid-isophthalic acid copolymer, terephthalic acid-ethylene glycol-1,4 cyclohexanedimethanol copolymer, polyester resin such as polyester thermoplastic elastomer, polymethyl (meth) ) Acrylic resins such as acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, methyl (meth) acrylate-styrene copolymer, polycarbonate resin, polyvinyl chloride, polystyrene, ionomer and the like can be mentioned. Among them, polypropylene is preferably used because it has high tensile strength, excellent chemical resistance, and excellent production process.
In addition, in this specification, (meth)acrylate means an acrylate or a methacrylate.

The thermoplastic resin layer may be unstretched, but may be uniaxially stretched or biaxially stretched as necessary.
The thickness of the thermoplastic resin layer is not particularly limited, but the preferable lower limit is 20 μm, the preferable upper limit is 500 μm, the more preferable lower limit is 60 μm, and the more preferable upper limit is 420 μm. If the thickness of the thermoplastic resin layer is less than 20 μm, the tensile strength may be insufficient and the surface of the pattern layer may not be protected. If it exceeds 500 μm, the transmittance of the transparent resin film of the present invention decreases. The visibility of the pattern in the pattern layer may be reduced.

The surface of the thermoplastic resin layer on the side where the outer haze layer is provided (hereinafter, also referred to as the back surface) and the surface on the opposite side (hereinafter, also referred to as the front surface) may be a smooth surface and have an uneven shape. May be.
When the surface is a smooth surface, the pattern layer laminated on one surface of the base material can be projected more clearly.
The smooth surface means a surface having a center line average roughness Ra of 2.0 μm or less as defined in JIS B 0601 (1982).

Further, since the surface has an uneven shape, the transparent resin film of the present invention can be given a sense of design, and the design of the decorative board using the transparent resin film of the present invention is further improved. be able to.
The method of forming the uneven shape on the surface of the thermoplastic resin layer is not particularly limited, and examples thereof include a method of embossing with heat and a method of transferring the uneven shape to the thermoplastic resin layer by a shaping sheet.
As the embossing by heat, for example, a well-known sheet or a method of performing embossing by a rotary type embossing machine can be mentioned.
Examples of the embossed pattern include sand grain, hairline, satin finish, wood grain conduit groove, stone plate surface unevenness, cloth surface texture, and many-line groove.
Also. The temperature at the time of embossing is not particularly limited, but a temperature at which the so-called embossing return, in which the uneven pattern disappears during heat pressure bonding, is preferable.
Further, the depth of the uneven shape to be formed is not particularly limited, but for example, it may be appropriately adjusted so that the center line average roughness Ra defined in JIS B 0601 (1982) is within the range of 5 to 20 μm. preferable.

As shown in FIG. 2, a surface protective layer 14 may be further provided on the surface of the thermoplastic resin layer 11 opposite to the outer haze layer 12 via a surface protective layer primer layer 13.
By having the above surface protective layer, the durability (scratch resistance, stain resistance, weather resistance, etc.) of the transparent resin film of the present invention becomes more excellent, and the surface protection of the pattern layer becomes possible more preferably. It is possible to suitably prevent deterioration of the design due to scratches on the transparent resin film itself of the present invention.
The surface protective layer may have a single layer structure, or may have a plurality of layer structures made of the same or different materials.

The surface protective layer is not particularly limited, and examples thereof include those made of a crosslinked cured product of a two-component curable resin and an ionizing radiation curable resin composition, and the crosslinked cured product is preferably transparent. As long as it is transparent, it may be translucent or colored as long as the pattern layer described later can be visually recognized.

Examples of the two-component curable resin include a two-component curable urethane resin, a two-component curable polyester resin, and a two-component curable epoxy resin.
Examples of the ionizing radiation curable resin composition include oligomers having a radically polymerizable unsaturated bond or a cationically polymerizable functional group in the molecule (hereinafter, so-called prepolymers, macromonomers and the like are also included) and / or in the molecule. A monomer having a radically polymerizable unsaturated bond or a cationically polymerizable functional group is preferably used. The ionizing radiation here means an electromagnetic wave or charged particles having energy capable of polymerizing or crosslinking a molecule, and usually an electron beam (EB) or an ultraviolet ray (UV) is generally used.

Examples of the above-mentioned oligomer or monomer include compounds having a radically polymerizable unsaturated group such as a (meth)acryloyl group and a (meth)acryloyloxy group, a cationically polymerizable functional group such as an epoxy group, in the molecule. These oligomers and monomers may be used alone or in combination of two or more. In addition, in this specification, the said (meth)acryloyl group means an acryloyl group or a methacryloyl group.

Examples of the oligomer having a radically polymerizable unsaturated group in the molecule include oligomers such as urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, and triazine (meth) acrylate. Can be preferably used, and urethane (meth) acrylate oligomer is more preferable. As the molecular weight, a molecular weight of about 2.5 to 100,000 is usually used.

Moreover, as the monomer having a radically polymerizable unsaturated group in the molecule, for example, a polyfunctional monomer is preferable, and a polyfunctional (meth)acrylate is more preferable.
Examples of the polyfunctional (meth)acrylate include diethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, bisphenol A ethylene oxide-modified di(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolpropane. Ethylene oxide tri(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate {5-functional (meth)acrylate}, dipentaerythritol hexa(meth)acrylate {6-functional (meth)acrylate} Etc. Here, the polyfunctional monomer means a monomer having a plurality of radically polymerizable unsaturated groups.

In the present invention, it is more preferable that the above-mentioned ionizing radiation-curable resin composition contains an ionizing radiation-curable resin component composed of a urethane acrylate oligomer and a polyfunctional monomer, and as the ionizing radiation-curable resin component, a urethane acrylate oligomer/polyfunctional The monomer (mass ratio) is particularly preferably 6/4 to 9/1. Within this mass ratio range, scratch resistance can be made more excellent.
In addition, if necessary, in addition to the above-mentioned ionizing radiation-curable resin component, a monofunctional monomer may be appropriately used within the range not deviating from the object of the present invention.
Examples of the monofunctional monomer include methyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and phenoxyethyl (meth)acrylate.

When the above ionizing radiation-curable resin composition is cross-linked with ultraviolet rays, it is preferable to add a photopolymerization initiator to the ionizing radiation-curable resin composition.
When the ionizing radiation curable resin composition is a resin system having a radically polymerizable unsaturated group, acetophenones, benzophenones, thioxanthones, benzoins, and benzoin methyl ethers are used alone or in combination as the photopolymerization initiator. Can be used.
Further, when the ionizing radiation curable resin composition is a resin system having a cationically polymerizable unsaturated group, as the photopolymerization initiator, an aromatic diazonium salt, an aromatic sulfonium salt, an aromatic iodonium salt, a metatheron compound, benzoin Sulfonic acid esters and the like can be used alone or as a mixture. The addition amount of these photopolymerization initiators is about 0.1 to 10 parts by mass with respect to 100 parts by mass of the ionizing radiation curable resin component.

Incidentally, various additives may be further added to the ionizing radiation curable resin composition, if necessary. Examples of these additives include urethane resin, polyvinyl acetal resin, polyester resin, polyolefin resin, styrene resin, polyamide resin, polycarbonate resin, acetal resin, vinyl chloride-vinyl acetate copolymer, vinyl acetate resin, and acrylic resin. , Thermoplastic resins such as cellulose resins, lubricants such as silicone resins, waxes and fluororesins, UV absorbers such as benzotriazole and benzophenone, light stabilizers such as hindered amine radical traps, colorants such as dyes and pigments, etc. Is.

As the electron beam source of ionizing radiation, for example, various electron beam accelerators such as Cockcroft-Walton type, bandegraft type, resonance transformer type, insulated core transformer type, linear type, dynamistron type, and high frequency type are used. It can be used to irradiate an electron with an energy of 70 to 1000 keV. Further, the irradiation dose of the electron beam is preferably, for example, about 1 to 10 Mrad.
Further, as the ultraviolet ray source of the ionizing radiation, for example, a light source such as an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light, a metal halide lamp can be used, and the wavelength of the ultraviolet ray is usually from 190 to 380 nm. The wavelength range is mainly used.

The primer layer for the surface protection layer preferably contains a binder resin.
The primer layer for the surface protective layer is preferably transparent, and as long as it is transparent, it may be translucent or colored as long as the pattern layer is visible.
Examples of the binder resin include urethane resin, acrylic resin, acrylic-urethane resin, acrylic-urethane copolymer resin, cellulose resin, polyester resin, vinyl chloride-vinyl acetate copolymer resin and the like. When the urethane acrylate oligomer is added to the ionizing radiation curable resin composition of the surface protective layer described above, the urethane resin is preferable from the viewpoint of adhesion to the surface protective layer and efficiency during production.

The thickness of the primer layer for the surface protection layer is preferably 0.5 μm or more and 10 μm or less. If it is 0.5 μm or more, the adhesion between the transparent resin film of the present invention and the pattern layer described later can be suitably secured, and if it is 10 μm or less, the transparent resin film of the present invention does not become too thick and is sufficient. High transparency can be obtained, and the design of the decorative board can be preferably ensured. In addition, blocking during film formation can be suppressed.
Note that blocking is a phenomenon in which a transparent resin film is coated with a film-forming or adhesive primer, rolled up in a roll shape, and the films are difficult to separate from each other when the film is unwound.
Further, the primer layer for the surface protection layer may contain inorganic fine particles such as silica.

The transparent resin film of the present invention has an outer haze layer.
The outer haze layer is laminated on the back surface of the thermoplastic resin layer in order to protect the surface of the pattern layer laminated on one surface of the base material described later.
In the transparent resin film of the present invention, the haze value of the outer haze layer is 4% or more and less than 100%. If the haze value is less than 4%, air biting cannot be visually discriminated when the transparent resin film of the present invention is laminated on the surface of the pattern layer, and the adhesion is also insufficient. The preferable lower limit of the haze value is 5%, and the more preferable lower limit is 6%.

The haze value of the outer haze layer is a value obtained by subtracting the haze when the back surface is wet from the haze of the entire transparent resin film.
The haze of the entire transparent resin film can be measured, for example, by irradiating light from the surface side of the outer haze layer or the surface side of the transparent resin film and using a known haze meter.
The haze when the back surface is wet is from the front surface side of the transparent resin film with PET having a haze value of 0.1% or less attached to the back surface side of the transparent resin film via pure water. It can be measured by exposing it to light and using a known haze meter. This is because the haze value obtained by removing the haze value of the outer haze layer from the transparent resin film can be calculated in this way.

In the transparent resin film of the present invention, a polyethylene terephthalate film having a haze value of 0.1% or less is attached to the side opposite to the thermoplastic resin layer side of the outer haze layer via a pure water layer, and the thermoplastic resin layer is attached. The haze value when the back surface measured from the side is wet is preferably 90% or less. If it exceeds 90%, the transparency of the transparent resin film of the present invention is lowered, and the visibility of the pattern layer may be inferior when it is used as a decorative board. The more preferable upper limit of the haze value when the back surface is wet is 80%, and the more preferable upper limit is 60%.

The material constituting the outer haze layer is a material used to improve the adhesion with the pattern layer. For example, urethane resin, acrylic resin, urethane-acrylic resin, urethane-acrylic copolymer resin, etc. Examples thereof include cellulose resin, polyester resin, vinyl chloride-vinyl acetate copolymer and the like.

The outer haze layer preferably has a thickness of 0.5 μm or more and 20 μm or less. If it is less than 0.5 μm, the adhesion between the base material and the transparent resin film is insufficient, while if it exceeds 20 μm, the front and back surfaces of the film come into contact with each other when the transparent resin film is made into a roll. Blocking may occur. A more preferable lower limit of the thickness of the outer haze layer is 0.8 μm, a more preferable upper limit is 15 μm, a further preferable lower limit is 1 μm, and a further preferable upper limit is 10 μm.

Examples of the method for keeping the haze value in the wet state of the back surface within the above range include a method of adjusting the amount of additives contained in the thermoplastic resin layer, a method of reducing the thickness of the thermoplastic resin layer, and the like. Conceivable.

The outer haze layer may be subjected to surface treatment such as corona discharge treatment or plasma treatment on the surface of the thermoplastic resin layer to which the outer haze layer is provided in order to further strengthen the adhesion with the thermoplastic resin layer. .. The method and conditions of the surface treatment may be carried out according to a known method.
Further, a primer layer may be formed between the outer haze layer and the base material layer to enhance the adhesion. The outer haze layer may have a function as a primer layer for improving adhesion with the base material layer and the thermoplastic resin layer.

The outer haze layer may have a single layer or a plurality of layers similar to the thermoplastic resin layer on the surface opposite to the thermoplastic resin layer side.

The transparent resin film of the present invention is used to protect the above-mentioned pattern layer, and has an outer haze layer having a predetermined haze value on the surface laminated on the pattern layer of the base material. When the transparent resin film is laminated on the surface, it can be easily visually determined whether or not it is biting air, and it becomes easy to improve the adhesion to the pattern layer.
A decorative board, which comprises a base material, a pattern layer, and a transparent resin film of the present invention in this order in the thickness direction, is also an aspect of the present invention.

Next, a preferable example of the decorative board of the present invention will be described with reference to FIG.
In the decorative board 20 of the present invention, the pattern layer 24 is laminated on one surface of the base material 25, and the transparent resin film 10 of the present invention is laminated on the side of the pattern layer 24 opposite to the side having the base material 25. There is.
Further, it is preferable to have the adhesive layer 23 from the viewpoint of further strengthening the adhesion between the pattern layer 24 and the transparent resin film 10 of the present invention.
Hereinafter, each component of the decorative board of the present invention will be described.

The material forming the base material is not particularly limited, and examples thereof include known materials such as resin materials, wood materials, and metal materials. Also, a composite material of these may be used.
The resin material preferably contains, for example, a thermoplastic resin.
Examples of the thermoplastic resin include polyvinyl chloride resins such as polyvinyl chloride resin, polyvinyl acetate resin and polyvinyl alcohol resin, polyethylene, polypropylene, polystyrene, ethylene-vinyl acetate copolymer resin (EVA), and ethylene- (meth) acrylic acid. Heat of polyolefin resins such as based resins, polyester resins such as polyethylene terephthalate resin (PET resin), acrylic resins, polycarbonate resins, polyurethane resins, acrylonitrile-butadiene-styrene copolymers (ABS resins), acrylonitrile-styrene copolymers, etc. A single resin and a copolymer of a plastic resin, or a mixed resin thereof are preferably used. Of these, polyolefin resins, acrylonitrile-butadiene-styrene copolymers, polyvinyl chloride resins, ionomers and the like are preferable. Furthermore, the resin material may be foamed.

Examples of the wood material include various materials such as cedar, cypress, keyaki (zelkova), pine, lauan, teak, and melapy, and the core material includes a veneer made of these materials and a single piece of wood. Any of a board, a wood plywood (including LVL), a particle board, a medium density fiberboard (MDF), a high density fiberboard (HDF), a laminated material, or the like, or a laminated material in which these are appropriately laminated may be used. ..
Examples of the metal material include iron.
Further, the base material may include an inorganic compound.

When the base material has a plurality of thermoplastic resin layers, the types of resins forming the plurality of thermoplastic resin layers may be the same or different, and the thickness of the plurality of thermoplastic resin layers may be the same. May be the same or different.

In the present invention, the base material may have a hollow structure, a slit groove or a through hole may be provided in a part of the base material, or a frame-shaped material obtained by combining the above materials.

The thickness of the base material is not particularly limited, and is preferably 0.01 mm or more, more preferably 0.1 mm or more and 50 mm or less, for example.
The base material has a substantially plate-like shape other than a flat plate, and includes those having irregularities and curved surfaces.

Further, the pattern layer provided on the base material is a layer that imparts decorativeness to the decorative board of the present invention made of the transparent resin film of the present invention, and is, for example, a uniformly colored concealing layer (solid). It may be a print layer), a pattern layer formed by printing various patterns using ink and a printing machine, or a layer in which a concealing layer and a pattern layer are combined (hereinafter, a pattern layer). ) May be.

By providing the above-mentioned concealing layer, when the above-mentioned base material is colored or has color unevenness, it is possible to give an intended color and adjust the surface color.
In addition, by providing a pattern layer, stone patterns that imitate the surface of rocks such as wood grain patterns and marble patterns (for example, Travertin marble patterns), fabric patterns that imitate cloth textures and cloth-like patterns, tiled patterns, and brickwork It is possible to give a pattern or the like, or a pattern such as a parquet or a patchwork in which these are combined, to the decorative sheet. These patterns are formed not only by multicolor printing using normal yellow, red, blue, and black process colors, but also by multicolor printing using special colors by preparing individual color plates that make up the pattern. To be done.

As the ink composition used for the above-mentioned pattern layer, a binder resin in which a colorant such as a pigment or a dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, a curing agent and the like are appropriately mixed is used. The binder resin is not particularly limited, and examples thereof include urethane resin, vinyl chloride / vinyl acetate copolymer resin, vinyl chloride / vinyl acetate / acrylic copolymer resin, acrylic resin, polyester resin, and nitrocellulose resin. Be done. As the binder resin, any one of these may be used alone or in combination of two or more.
In addition, as the colorant, carbon black (black ink), iron black, titanium white, antimony white, yellow lead, titanium yellow, red halo, cadmium red, ultramarine, cobalt blue and other inorganic pigments, quinacridone red, isoindolinone Organic pigments such as yellow and phthalocyanine blue, metal pigments consisting of scale-like foil pieces such as dyes, aluminum and brass, pearlescent pigments consisting of scale-like foil pieces such as titanium dioxide coated mica and basic lead carbonate. Are preferred.

The thickness of the pattern layer is not particularly limited, and is preferably 0.1 μm or more, more preferably 0.5 μm or more and 600 μm or less. When the thickness of the pattern layer is within the above range, an excellent design can be imparted to the decorative board of the present invention and concealability can be imparted.
If you want to make the best use of the design of the base material itself, such as a veneer, which has a design property in advance, the base material itself also serves as a design layer, so it is not necessary to provide a separate design layer. ..

The transparent resin film of the present invention is used to protect the surface of the pattern layer by laminating the outer haze layer on the surface of the pattern layer laminated on one surface of the above-mentioned base material.
A decorative board characterized in that a base material, a pattern layer, and the transparent resin film of the present invention are provided in this order in the thickness direction is also one of the present inventions.

The thickness of the decorative board of the present invention is not particularly limited, and is preferably 0.05 mm or more, more preferably 1 mm or more and 50 mm or less.

As a method for producing a decorative board of the present invention, for example, a heat melting method, a heat laminating method, a water-based adhesive, a heat-sensitive adhesive, a pressure-sensitive adhesive, a hot melt adhesive, and the above-mentioned adhesive layer are formed. Examples thereof include a method of laminating the base material, the pattern layer, and the transparent resin film using an adhesive or the like.
Among them, in the method for manufacturing the decorative board, the step of forming an adhesive layer on the surface of the transparent resin film on the side on which the pattern layer is laminated, and the transparent via the adhesive layer. It is preferable to have a step of bonding the sex resin film and the pattern layer.
Such a method for producing a decorative board of the present invention is also an aspect of the present invention.
In the transparent resin film, when the uneven shape having the pattern layer on the opposite side surface to be laminated is formed, the uneven shape is formed by embossing or the like, but the embossed surface side is formed. Following the uneven shape, a slight uneven shape is formed on the surface opposite to the embossed surface (the surface having the pattern layer). In such a case, air may enter the uneven shape on the side on which the pattern layer formed on the transparent resin film is laminated, so-called air damage may occur, and the design may deteriorate.
Since the method for producing a decorative board of the present invention includes a step of forming an adhesive layer on the surface of the transparent resin film on the side having the pattern layer, it also adheres to the concave-convex concave portion on the side having the pattern layer. The agent layer can be penetrated, the above-mentioned generation of air shavings can be prevented, and the deterioration of design can be suppressed.

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

(Example 1)
A transparent polypropylene film (thickness 60 μm) is prepared, and a two-component curable urethane resin (thickness 1 μm) using silica-added isocyanate as a curing agent is applied to one surface of the transparent polypropylene film as a primer layer for a surface protective layer. Was formed.

A transparent polypropylene resin (thickness 200 μm) was extruded and laminated on the other surface of the transparent polypropylene film (the side on which the primer layer for the surface protective layer was not coated) by an extrusion heat laminating method. After corona treatment was applied to the surface thereof, a two-component curable urethane resin (thickness 2 μm) using isocyanate as an external haze layer as a curing agent was applied. Urethane (meth) acrylate, which is an electron beam curable resin, is coated on the coated surface of the surface protective layer primer layer by a gravure coating method so that the coating amount is 15 μm, and then an acceleration voltage of 165 keV is applied using an electron irradiation device. A surface protective layer was formed by irradiating an electron beam under the condition of 5 rad. Then, heat absorption type embossing was performed so that the surface was in contact with the embossed plate, and the uneven shape was formed to produce a transparent resin film.
Then, using a haze measuring machine, the haze value of the entire transparent resin film and the haze when the back surface was wet were measured by the method described later.
On the other hand, an HDF (thickness 3 mm) was prepared, and a picture layer was formed on one surface of the HDF with an inkjet printer so that the thickness was 2 μm to prepare a base material.
A two-component curable polyester resin (thickness 50 μm) using isocyanate as a curing agent was applied to the side surface of the obtained transparent resin film opposite to the side having the uneven shape to form an adhesive layer, and the obtained transparency was obtained. The side surface of the resin film opposite to the concave-convex shape and the surface provided with the pattern layer side of the base material were laminated via the adhesive layer. Then, a pressure of 10 kg / m ² was applied and the mixture was cured in a normal temperature environment for 3 days.

(Haze measurement method)
As a measuring device, DIRECT HAZE METER (manufactured by Toyo Seiki Co., Ltd.) was used.
Haze value of the entire sheet: The haze value was measured by irradiating light from the surface side of the transparent resin film having the uneven shape, specifically, in Example 1, the surface protective layer having the uneven shape.
Haze value when the back surface is wet: Pure water is dropped on the surface side of the transparent resin film having the outer haze layer, and air bites the PET film (Toray Lumirror T60 50 μm thickness, haze value 0.1%). The haze value was measured by irradiating light from the surface side of the transparent resin film having an uneven shape in that state.
Haze value of the external haze layer: Calculated as a value obtained by subtracting the haze value when the back surface is wet from the haze value of the entire sheet.

(Visual confirmation of air bite)
++ ・ ・ ・ Air bite can be clearly judged ＋ ・ ・ ・ Air bite can be judged by checking with oblique light － ・ ・ ・ Air bite cannot be judged

(Design at the time of close contact)
++++ ・ ・ ・ The design after laminating looks very clear ++ ・ ・ ・ The design after laminating looks slightly cloudy ＋ ・ ・ ・ The design after laminating looks very cloudy ― ・ ・ ・ The design after laminating Can hardly be seen (Examples 2 to 4, Comparative Example 1)
A transparent resin film was produced in the same manner as in Example 1 except that samples having different haze values in the outer haze layer were used as shown in Table 1. Then, the same evaluation as in Example 1 was performed.

According to the present invention, it is possible to provide a transparent resin film that can visually confirm whether or not the pattern layer of the base material and the transparent resin film can be adhered to each other. The decorative board of the present invention is suitably used for doors such as fittings and sliding doors, which are building materials for interior decoration, floor materials, walls, ceilings, and various decorative molded bodies.

10 Transparent resin film of the present invention 11 Thermoplastic resin layer 12 External haze layer 13 Primer layer for surface protective layer 14 Surface protective layer 20 Decorative board 23 Adhesive layer 24 Pattern layer 25 Base material

Claims (4)

A transparent resin film for protecting a pattern layer laminated on one side of a substrate,
The transparent resin film has at least a thermoplastic resin layer and an outer haze layer on the side to be laminated on the pattern layer.
The haze value of the outer haze layer is 4% or more and less than 100%.
A polyethylene terephthalate film having a haze value of 0.1% or less is attached to the side opposite to the thermoplastic resin layer side of the outer haze layer via a pure water layer, and the back surface measured from the thermoplastic resin layer side is wet. der haze value of 90% or less of at is,
The transparent resin film is characterized in that the haze value of the outer haze layer is a value obtained by subtracting the haze value when the back surface is wet from the haze value of the entire transparent resin film. The transparent resin film according to claim 1, wherein the thickness of the outer haze layer is 0.5 μm or more and 20 μm or less. A decorative board comprising, in order in the thickness direction, a base material, a pattern layer, and the transparent resin film according to claim 1 or 2. The method for manufacturing a decorative board according to claim 3.
A step of forming an adhesive layer on the surface of the transparent resin film on which the picture layer is laminated, and
A method for manufacturing a decorative board, comprising a step of bonding the transparent resin film and the pattern layer via the adhesive layer.

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