JPH10157320A - Transfer sheet and production of decoration board employing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart scratch resistance, chemical resistance and contamination resistance to the surface of a decoration board being produced by transferring a transfer sheet. SOLUTION: The transfer sheet S comprises a strip layer 2 and a decoration layer 3 formed sequentially on a resin film support 1 wherein the strip layer 2 is composed of a polymer of urethane acrylate or urethane metacrylate, an acryl resin having no crosslinking functional group, and a polyester resin. The decoration board is produced by pressing the transfer sheet S by means of an elastic roller having rubber hardness of 65 deg. or below thereby copying the irregularities on the surface of a basic material to be transferred or applying the transfer sheet S to the irregular surface of the basic material to be transferred and hitting the transfer sheet S with solid particles from the support side thereby copying the irregularities on the surface of a basic material to be transferred with the hitting pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer sheet for a decorative sheet having a surface having scratch resistance, chemical resistance and stain resistance, and a method for producing a decorative sheet using the transfer sheet.

[0002]

2. Description of the Related Art Conventionally, there are various methods for imparting surface properties such as scratch resistance, chemical resistance and stain resistance to a decorative plate. One is a surface coating in which a paint having desired surface properties is directly applied to the surface of the decorative plate by spray coating, flow coating, brush coating, or the like. When the decorative sheet surface is decorated with a transfer sheet, there is a method in which a release layer having desired surface properties is formed in advance on the transfer sheet side, and the decorative sheet surface is provided with the surface properties simultaneously with the decoration. As such a release layer, for example, a hard coating film obtained by crosslinking and curing a coating film formed by coating with a coating of a polyfunctional (meth) acrylate monomer with irradiation of ionizing radiation such as ultraviolet rays or electron beams is peeled. Layers. And
The transfer sheet has a structure in which a picture layer and an adhesive layer are provided on the release layer (Japanese Patent Publication No. 61-3272, Japanese Utility Model Publication No. 64-1154, etc.). Further, when a transfer sheet is similarly used, there is a method in which a resin layer of a non-crosslinkable thermoplastic resin such as nitrocellulose or polymethyl methacrylate is used as a release layer (Japanese Patent Publication No. 7-100398).

[0003]

However, in the above direct coating, when decorating the surface of the base material, steps such as sealer treatment, undercoating, and overcoating of the base material may be required, and the process is complicated. There is a problem that there is. In addition, the front surface of the base material can have the same color tone and gloss, but cannot impart a pattern or picture-like color tone and gloss, so that the decorative effect is insufficient. Further, in the method using the transfer sheet described above, an arbitrary pattern (pattern) can be provided, but there is a problem that adhesion between the release layer and the pattern layer is weak, and the release layer is hard and brittle. In particular, in the case of a substrate to be transferred having an uneven surface, there are problems that the release (surface protection) layer does not follow the uneven shape or that the release layer is cracked. Further, in the method using the transfer sheet according to the above, problems such as the above-mentioned interlayer adhesion and shape followability do not occur, but problems such as poor solvent resistance, scratch resistance and stain resistance of the transfer layer surface (release layer surface) occur. is there.

[0004]

Therefore, in the present invention, a transfer sheet has a structure in which a resin film is used as a support, and at least a release layer and a decorative layer are sequentially formed on the support as a transfer layer. The release layer is a prepolymer of urethane acrylate or / and urethane methacrylate, an acrylic resin having no crosslinkable functional group,
By using a crosslinked and cured ionizing radiation-curable resin composed of a polyester resin, it is possible to impart an arbitrary pattern without causing cracks and the like, especially on uneven surfaces, and to have sufficient scratch resistance. Surface properties such as chemical resistance and stain resistance.

In the method for producing a decorative sheet according to the present invention, the transfer sheet is pressed from the support side with an elastic roller having a rubber hardness of 65 ° or less from the support side to form a transfer substrate having irregularities on the surface. Following the transfer sheet to the surface irregularities, the transfer layer is adhered to the transfer layer, and then the support is peeled off to remove the scratches, chemical resistance, and contamination resistance even on the uneven surface of the substrate. The surface physical properties such as the properties can be transferred together with the picture layer. Further, another method of the method for manufacturing a decorative board of the present invention is such that the transfer layer side of the transfer sheet is overlapped with the transfer sheet facing the uneven surface of the substrate to be transferred having unevenness on the surface. The solid particles are collided from the body side, and the collision pressure is used to form the transfer sheet in accordance with the irregular shape of the surface of the substrate to be transferred and adhere the transfer layer, and then the support is peeled off and removed. Surface physical properties such as scratch resistance, chemical resistance, and stain resistance can be transferred to the uneven surface of the material together with the picture layer.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for producing a transfer sheet and a decorative sheet according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing one embodiment of the transfer sheet of the present invention, and FIG.
FIG. 3 is an explanatory view conceptually showing a transfer method using an elastic roller, which is the method of FIG. 3. FIG. 3 shows a transfer method using the collision pressure of solid particles, which is a second method according to the method of manufacturing a decorative board of the present invention. It is explanatory drawing shown notionally.

(Transfer Sheet) First, as exemplified in FIG. 1, a transfer sheet S of the present invention comprises at least a support 1, a release layer 2 and a decorative layer 3, and the release layer 2 and the decorative layer 3 are covered. It becomes a transfer layer that transfers to a transfer substrate. Decorative layer 3
For example, a picture layer 3a, a colored solid layer 3b, or the like is used. Note that an adhesive layer may be further laminated on the decorative layer 3.

[0009] As the resin film comprising a support substrate 1, a biaxially stretched polyethylene terephthalate film, polybutylene terephthalate film, polyester film and the like, polypropylene film, polyethylene film, polyolefin films such as polymethyl pentene film, chloride Low-stretch or non-stretch resin films such as vinyl resin films and polyamide films have been used. Also,
Elastomer films such as urethane-based thermoplastic elastomers and olefin-based thermoplastic elastomers can also be used as the resin film. The thickness of the support may be any thickness that is sufficient to perform the function of supporting the transfer layer, and is usually preferably about 10 to 100 μm. If it is too thin, it will be easy to cut and wrinkle at the time of transfer, and if it is too thick, the cost will increase and the followability to surface irregularities will decrease. In addition, if necessary, a release layer (a layer that is peeled off from the release layer together with the support) may be formed on the transfer layer side of the support according to a known method, or an irregular shape such as a grain or a hairline may be formed. May be formed.

[0010] release layer peeling layer 2 is made of a urethane acrylate and / or a prepolymer of urethane methacrylate, and acrylic resin having no crosslinking functional group, the composition further the polyester resin added to the coating a reinforcing agent which It is a cross-linked cured product of an ionizing radiation-curable resin. The release layer is a crosslinked cured product of an ionizing radiation-curable resin having these three components, thereby maintaining the adhesion between the release layer and the picture layer, and has a solvent-resistant and abrasion-resistant or stain-resistant surface. Excellent physical properties. In addition, since the release layer is sufficiently flexible, it is possible to prevent the release layer from following the uneven shape or causing a crack in the release layer even in the case of a transfer substrate having an uneven surface.

The urethane acrylate or urethane methacrylate prepolymer is a component that actually contributes to the crosslinking and curing reaction by irradiation with ionizing radiation. The urethane acrylate or urethane methacrylate includes (meth) acrylates such as 2-hydroxyethyl (meth) acrylate and butyl (meth) acrylate, and 1,6-hexanediol, 1,4-cyclohexanedimethanol,
Polyacrylates such as ethylene glycol, isophorone diisocyanate, hexamethylene diisocyanate, is an acrylate or methacrylate having a urethane bond obtained by reacting with an isocyanate such as tolylene diisocyanate, and various urethane acrylates and urethane methacrylates conventionally known as ionizing radiation-curable resins. Can be used. In use, one or both of urethane acrylate and urethane methacrylate can be used as a prepolymer component which is one of the three components forming the release layer. The average molecular weight of this prepolymer (including so-called oligomers) is usually 5
About 00 to 50,000 can be used.

In the present invention, the term "acrylic resin having no crosslinkable functional group" means that ionizing radiation is used for crosslinking and curing for forming a release layer. Therefore, the acrylic resin does not have a functional group which causes a crosslinking and curing reaction due to the ionizing radiation. Therefore, it refers to an acrylic resin that does not participate in the crosslinking curing reaction due to ionizing radiation. Specifically, methyl poly (meth) acrylate, ethyl poly (meth) acrylate, propyl poly (meth) acrylate, butyl poly (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate Copolymer,
Ethyl (meth) acrylate-butyl (meth) acrylate copolymer, methyl (meth) acrylate-ethyl (meth) acrylate copolymer, ethylene-methyl (meth) acrylate copolymer, (meth) acrylic It is an acrylic resin composed of a homo- or copolymer of a (meth) acrylic acid ester such as an acid methyl-styrene copolymer. In addition, (meth) acrylic acid means acrylic acid or methacrylic acid. The average molecular weight of this acrylic resin is from 50,000 to
600,000 and a glass transition temperature of 50 to 130 ° C, preferably 80 to 110 ° C. Average molecular weight of 5
If it is less than 000, the abrasion resistance of the release layer made of the ionizing radiation-curable resin after curing is extremely reduced. On the other hand, when the average molecular weight is 600,000 or more, the elongation of the peeling layer at the time of transfer decreases, and therefore, the crack of the peeling layer occurs due to deformation 2 at the time of transfer. When the glass transition temperature is 50 ° C. or lower, the abrasion resistance of the release layer made of the ionizing radiation-curable resin after curing is extremely reduced. (Dryness to dryness) becomes insufficient. On the other hand, when the glass transition temperature is 130 ° C. or higher, the elongation of the release layer during transfer decreases.

The polyester resin serves as a film reinforcing agent for the release layer. Like the acrylic resin, the polyester resin does not have a functional group that causes a crosslinking and curing reaction by ionizing radiation, and does not participate in the crosslinking and curing reaction by ionizing radiation. As the polyester resin, for example, having two or more ester bonds, for example, as a diol component, ethylene glycol, propylene glycol, trimethylene glycol,
Using butylene glycol, neopentyl glycol, etc., polyester obtained by condensing both using terephthalic acid, isophthalic acid, phthalic acid, oxalic acid, malonic acid, succinic acid, adipic acid, sebacic acid, etc. as a dicarboxylic acid component Resin.

When an ionizing radiation-curable resin comprising a mixture of the above prepolymer, acrylic resin and polyester resin is crosslinked and cured, the prepolymer component in the resin is crosslinked and cured, and the crosslinked and cured ionizing radiation curable resin is cured. It becomes a release layer made of resin.

Here, the term "ionizing radiation" means an electromagnetic wave or a charged particle beam having an energy quantum capable of polymerizing or cross-linking a molecule, and usually ultraviolet (UV) or electron beam (EB) is used. . When curing with ultraviolet light or visible light, a photopolymerization initiator is further added to the ionizing radiation-curable resin. In the case of a resin system having a radical polymerizable unsaturated group, acetophenones, benzophenones, thioxanthones, benzoin, benzoin methyl ethers can be used alone or in combination as a photopolymerization initiator. The addition amount of these photopolymerization initiators is about 0.1 to 10 parts by weight based on 100 parts by weight of the ionizing radiation-curable resin. In addition, as an ultraviolet source for curing, an ultra-high pressure mercury lamp, a high pressure mercury lamp,
Light sources such as a low-pressure mercury lamp, a carbon arc lamp, a black light, a metal halide lamp, and an excimer lamp are used. As a wavelength of the ultraviolet light, a wavelength range of 190 to 380 nm is usually mainly used. In addition, as the electron beam source, using various electron beam accelerators such as Cockcroft-Walton type, Van degraft type, resonance transformer type, insulating core transformer type, or linear type, dynamitron type, high frequency type, etc.
100 to 1000 keV, preferably 100 to 300
A device that irradiates electrons having an energy of keV is used. The absorbed dose is usually about 1 to 10 Mrad.

The ionizing radiation-curable resin may further contain, if necessary, a monomer component involved in crosslinking and curing. Examples of the monomer include monofunctional monomers such as methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and phenoxyethyl (meth) acrylate. Further, as the polyfunctional monomer, diethylene glycol di (meth) acrylate,
There are propylene glycol di (meth) acrylate, trimethylpropane tri (meth) acrylate, trimethylolpropane ethylene oxide tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and the like. In addition, a styrene monomer can be added.

Further, in addition to the ionizing radiation-curable resin,
Various additives can be added as needed. Examples of these additives include fillers made of fine powder such as calcium carbonate, barium sulfate, silica, and alumina.

The release layer is formed by applying a solution obtained by appropriately adding a diluting solvent to the ionizing radiation-curable resin containing an acrylic resin and a polyester resin.

Decorative Layer As the decorative layer 3, a typical one is a picture layer 3.
a, the solid color layer 3b, or a combination thereof. Conventionally known methods such as gravure printing, silk screen printing, offset printing, etc.
A printing layer on which a pattern or the like is printed with a material, a metal thin film layer or the like partially formed of a metal such as aluminum, chromium, gold, and silver by using a conventionally known vacuum evaporation method or the like. Used. The pattern is arbitrary, such as woodgrain, stonegrain, tile, brick, and abstract pattern. The colored solid layer 3b is also a layer formed by a conventionally known method or material such as various printing methods or coating methods similarly to the picture layer 3a, and is a layer that can also be used as a concealing layer. In addition, an acrylic resin, a vinyl chloride resin-vinyl acetate resin copolymer, a polyester resin, a cellulose resin, a fluororesin, or the like is used as a binder resin for forming the picture layer 3a and the colored solid layer 3b. If a decorative panel for exterior is to be obtained, the binder should be fluororesin or acrylic resin and vinyl chloride.
A mixture with a vinyl acetate copolymer is preferred for maintaining weather resistance. In addition, aluminum, chrome,
A metal thin film layer or the like in which a metal such as gold or silver is formed on the entire surface by using a conventionally known vacuum deposition method or the like can also be used.

Adhesive Layer In the transfer sheet of the present invention, an adhesive layer may be provided in advance after forming the decorative layer. By providing the adhesive layer in advance on the transfer sheet, it is also possible to omit the application of the adhesive to one or both of the transfer sheet and the substrate to be transferred at the time of transfer. The adhesive layer of the transfer sheet
It is appropriately selected in consideration of the adhesion to the substrate to be transferred and the suitability for elongation during transfer. Specifically, a conventionally known heat-sensitive adhesive of thermoplastic resin such as vinyl acetate resin and acrylic resin, or a urethane-based moisture-curable hot melt adhesive,
A rubber-based adhesive, an uncured, room-temperature solid ionizing radiation-curable resin adhesive, or the like can be used. In the case of an ionizing radiation-curable resin adhesive, the release layer is cross-linked and cured before applying the adhesive. In the method for producing a decorative board of the present invention described below,
The adhesive is not necessarily limited to the form provided in advance on the transfer sheet.

(Method of Manufacturing a Decorative Plate) Next, a method of manufacturing a decorative plate of the present invention will be described.

The first method, as shown in FIG. 2, is a method for pressing the transfer sheet S against the substrate B to be transferred as disclosed in
Japanese Patent Application Laid-Open No. 99550/99, Japanese Unexamined Patent Application Publication No. 8-216599, and the like. In the present invention, as an elastic body of the elastic roller, silicone rubber, fluorine rubber, viton rubber,
Butadiene rubber, natural rubber and the like are used. Elastic roller R
Usually, a pressing roller in which the periphery of a rigid shaft core R1 such as iron is covered with an elastic body R2 is used. The elastic roller is preferably a soft elastic roller having a rubber hardness of 65 ° or less in order to form the transfer sheet following the irregular shape of the substrate to be transferred. If the rubber hardness exceeds 65 °, the transfer sheet cannot sufficiently adhere to the uneven surface of the substrate to be transferred as the pressing roller, and the transfer layer cannot be adhered to the uneven surface of the substrate to be transferred. Further, in order to follow the irregular shape of the transfer sheet and improve the suitability for molding, it is preferable to heat the transfer sheet, the base material, or both, and to soften the transfer sheet by the heat. As one method of heating the transfer sheet, there is a method of heating a soft elastic roller. The heating method is
Infrared radiation heater, dielectric heating, etc. can be adopted.

The second method is a method of pressing the transfer sheet against the substrate to be transferred by spraying solid particles on the support side of the transfer sheet and transferring the particles by utilizing the collision pressure. This second method will be described with reference to the conceptual diagram of FIG.
In the case of FIG. 3, the transfer sheet S is unwound from the sheet supply device 21 of the sheet feed device 20 with respect to the transfer target substrate B transported by the substrate transport device 10 such as a driving rotary roller row and a belt conveyor. The solid particles P are caused to collide with the support-side surface of the transfer sheet from the blowing nozzle 34 while being conveyed at a constant speed slightly apart from the base material to be transferred by the pressure applying unit 30,
The transfer sheet is adhered to the transfer sheet by following the irregularity shape of the surface of the substrate to be transferred by the impact pressure. Then, when the support of the transfer sheet is peeled off by the peeling roller 23, the decorative plate D is obtained. The transfer sheet support after passing through the peeling roller is taken up as a discharge roll by the sheet discharge device 24.

In FIG. 3, the solid particles P used for applying the collision pressure are shown.
Is mixed with the air supplied from the hopper 31 and supplied from the blower or the compressor 32 by the manifold 33, and is then sent to the blowing nozzle 34 and blown onto the side surface of the support of the transfer sheet with the blown air. . The change in the momentum of the solid particles that has collided with the transfer sheet support surface is the collision pressure that presses the transfer sheet against the transfer substrate. A plurality of blowing nozzles are usually arranged in the width direction of the transfer sheet, and apply the collision pressure of the solid particles in a belt shape. The solid particles that have collided with the transfer sheet bypass the side surface of the sheet support device 22 and collect in the lower part of the chamber 35, from which they are sucked by the drain pipe 36 and collected in the original hopper 31. Further, the air ejected from the blowing nozzle is also sucked in by the drain pipe, and the solid particles are filtered by the filter, and then discharged out of the system by the vacuum pump 37. The solid particles include inorganic particles such as glass beads, metal particles such as iron, and organic particles such as resin beads such as nylon beads and crosslinked rubber beads.
It is about. Further, the solid particles and the air to be blown out may be heated. The spray pressure of solid particles is usually 0.1 to 10.0k
g / cm ² , and the air flow velocity is usually about 5 to 20 m / sec.

The transfer sheet S is preferably preheated and softened by a heating device 40 such as an infrared radiation heater or dielectric heating immediately before the application of the collision pressure in order to improve the stretchability of the sheet. In FIG. 3, the preheating is performed after the transfer sheet is conveyed while being sandwiched at both ends in the width direction by the sheet support device 22 in the chamber 35, so that the sheet does not stretch and hinder the conveyance. is there. When the heat-melting adhesive layer is applied to the transfer sheet, the sheet preheating is also performed for the purpose of activating the transfer sheet. In the second method of the present invention, in the example of FIG. 3, the blowing nozzle position is fixed, and the collision pressure is applied to the entire surface of the transfer surface by moving the transfer substrate and the transfer sheet. A method in which the base material and the transfer sheet are fixed and the blowing nozzle is moved to intermittently transfer the base material one by one may be used.

In the method for manufacturing a decorative sheet according to the present invention, in both the first and second methods, the method using an adhesive for bringing the transfer layer into close contact with the substrate to be transferred includes a method of forming an adhesive layer on the transfer sheet in advance. Various methods other than the method of providing can be adopted. For example, a method in which the transfer sheet is not provided as an adhesive layer in advance, but is provided on the transfer sheet by coating or the like immediately before transfer, a method in which the transfer sheet is provided in advance or immediately before by a coating or the like, or a method in which the transfer sheet and the transfer sheet are provided. For example, a method is provided in which both of the base materials are provided in advance or immediately before by coating or the like. However, the method in which the adhesive layer is provided in advance only on the transfer sheet side has the advantage that the transfer sheet can be formed by printing or the like at the same time as the decoration layer and the like, and has the advantage that the time and equipment to be provided at the time of transfer can be omitted. It is difficult to use only a transfer sheet with an adhesive layer in order to make it adhere to a rough transfer receiving substrate. In such a case, the adhesive may be applied to one or both of the transfer sheet and the base material to be transferred at the time of transfer by the other method described above. In the case where an adhesive is applied to the transfer sheet, the base material to be transferred, or both immediately before the transfer, an adhesive layer of the transfer sheet, such as the above-mentioned heat-sensitive adhesive, is provided in advance as an adhesive layer of the transfer sheet. In addition to the adhesive, an adhesive such as a pressure-sensitive adhesive, a water-based adhesive, a hot-melt adhesive, a moisture-curable heat-sensitive adhesive, and a room temperature liquid ionizing radiation-curable resin adhesive can also be used.

Of course, the transfer method using the transfer sheet of the present invention is not necessarily limited to the above two methods, and other methods such as, for example, a method in which a transfer sheet is placed on a substrate to be transferred and a transfer layer is used. A so-called “vacuum press transfer method” (Japanese Patent Application Laid-Open No. H10-157556), in which a transfer sheet is placed so as to face the material side, vacuum-sucked from the base material side, and the transfer sheet is adhered to the surface shape of the base material according to the pressure difference between the front and back of the transfer sheet Various known methods such as those described in JP-A-50-23478 and JP-B-6-69759) may be applied.

Substrate to be Transferred The substrate to be transferred B used in the method for producing a decorative board of the present invention includes non-porcelain ceramics such as calcium silicate board, wood chip cement board, extruded cement board, and ALC (lightweight foamed concrete) board. System board, wood veneer, wood plywood, particle board,
Glued wood, wood board such as wood medium density fiber board (MDF), metal plate such as iron, aluminum, stainless steel, ceramics such as ceramics and glass, resin molded products such as polypropylene, vinyl chloride resin, ABS resin, etc. Can be used. These substrate surfaces may be coated in advance with an easy-adhesion primer for assisting the adhesion with the adhesive or a sealer for sealing and sealing fine irregularities and porosity on the surface. A resin such as an isocyanate, a two-part curable urethane resin, an acrylic resin, or a vinyl chloride-vinyl acetate copolymer is applied as an easy-adhesion primer or a sealer. Further, in the method for producing a decorative board of the present invention,
It is particularly effective as a substrate to be transferred, particularly for a substrate having irregularities on its surface. The uneven shape is optional, for example, joints when multiple tiles and bricks are arranged on a plane,
The unevenness of the stone surface such as the cleavage surface of granite, the unevenness of the surface of the wood panel such as the wood paneling and the floating grain, the unevenness of the surface of the siding-free siding, and the unevenness of the spray painted surface such as ricin and stucco.

[0029]

The present invention will be described in more detail with reference to specific examples and comparative examples.

Example 1 1) A 26 μm-thick biaxially stretched polyester film was used as a transfer sheet as a support, and a glass transition temperature of 105 ° C. and an average molecular weight of 3200 were used as a prepolymer for forming a release layer. 100 parts by weight of a trifunctional urethane acrylate, a polymethyl methacrylate resin 50 having an average molecular weight of 95,000 as an acrylic resin having no crosslinkable functional group
Parts by weight and an ionizing radiation curable resin mixed with 0.5 parts by weight of a polyester resin as a film reinforcing agent were applied by a gravure roll coater to provide an uncured release layer with a thickness of 5 μm. Next, carbon black, iron oxide,
A brick-like pattern layer is formed by gravure printing with an ink consisting of a pigment comprising titanium white, quinacridone, and isoindolidone, and a binder having an acrylic resin and a vinyl chloride-vinyl acetate copolymer resin in a weight ratio of 8: 2. did. 2) Next, the release layer was cured by irradiation with an electron beam under irradiation conditions of 165 keV and 3 Mrad to obtain a transfer sheet of the present invention.

3) As a substrate to be transferred having an uneven surface,
A calcium silicate plate (12 mm thick) having a joint groove (6 mm wide and 1.5 mm deep) engraved on the surface thereof was prepared. Then, a water-based acrylic adhesive is applied to the decorative layer surface of the transfer sheet, and dried at 70 ° C. for 30 seconds to form a 10 μm
After forming the transfer sheet, the transfer sheet is arranged so that the adhesive surface is not in contact with the base material to be transferred, and a silicone rubber having a surface temperature of 150 ° C. and a rubber hardness of 65 ° is applied from the support sheet side surface of the transfer sheet. Pressure was applied by a heating and pressing roller coated around the iron core. The transfer pressure was 10 kg / cm in linear pressure, and the transfer speed was 15 m / min. After cooling to room temperature, the support was peeled off and the transfer was completed.

(Comparative Example 1) An acrylic resin containing dipentaerythritol hexaacrylate, which is a polyfunctional acrylate, as a release layer and having no crosslinkable functional group,
A crosslinked cured product obtained by electron beam curing in the same manner as in Example 1 was used for the composition without any additive and the polyester resin. Otherwise, in the same manner as in Example 1, a transfer sheet and a decorative plate were obtained.

(Comparative Example 2) As a release layer, a coating liquid in which nitrocellulose was dissolved in a mixed solvent consisting of toluene, ethyl acetate and isopropyl alcohol was applied, and the solvent was dried to solidify and crosslink and cure. An uncoated film was used. Otherwise, in the same manner as in Example 1, a transfer sheet and a decorative plate were obtained.

(Comparison of performance) The follow-up formability of the transfer layer was evaluated as the suitability for transfer to the uneven surface.
Table 1 shows the results of evaluating the solvent resistance and the surface hardness. Incidentally, the follow-up formability of the transfer layer was evaluated by visually observing the follow-up formability to the joint groove, and the solvent resistance was determined by visually observing the state after toluene was dropped on the surface after transfer and covered with a watch glass for 24 hours. evaluated. The surface hardness was evaluated by a pencil hardness test. The stain resistance was determined by writing with black oil-based magic ink on the surface after the transfer, and after leaving for 24 hours, the writing surface was wiped off with a cloth containing toluene and a cloth containing water. The residual black ink was visually evaluated. As a result, as shown in Table 1, in Examples, the solvent resistance was good without any change, and the pencil hardness was 2
H was obtained, and the transfer layer was transferred to the concave portion of the joint groove, and no cracks were generated. However, in Comparative Example 1, although the solvent resistance was good and the pencil hardness was 4H, the transfer layer was transferred to the concave portion of the joint groove, but cracks occurred and the molding followability was not good. Was. In Comparative Example 2, the transfer layer was transferred to the concave portion of the joint groove and cracking did not occur, and the molding followability was good. However, the solvent resistance was such that the solvent dropping portion was dissolved and the pattern was melted and flowed. Poor, only a pencil hardness of 2B was obtained. Concerning the stain resistance, in the case of the example, the contaminant is less likely to be dyed than in the comparative example 2, and it is easy to wipe off. Further, in Comparative Example 1, although the stain resistance of the coating film itself was good, the contaminant penetrated from the crack portion, and the stain resistance was poor in that portion.

[0035]

[Table 1]

[0036]

According to the transfer sheet of the present invention, it is possible to obtain a decorative sheet having excellent surface properties such as scratch resistance, chemical resistance, and stain resistance, and also having excellent adhesion between the release layer and the decorative layer. . In particular, the transfer sheet has good followability and formability, including the release layer, even on the uneven surface shape of the substrate to be transferred. Further, excellent abrasion resistance, solvent resistance, and stain resistance, which cannot be obtained when the release layer is formed of a non-crosslinked thermoplastic resin such as nitrocellulose, can be obtained. Further, according to the method for manufacturing a decorative board of the present invention, even if the substrate to be transferred has an uneven surface, the transfer sheet can be formed by follow-up molding and transferred, and the surface of the surface has abrasion resistance, chemical resistance, stain resistance and the like. A decorative plate having excellent physical properties and excellent adhesion between the release layer and the decorative layer can be obtained. In particular, in the method using the collision pressure of solid particles, in addition to a plate material as a whole, it is difficult to manufacture by a method using a roller for pressing, a wavy shape as a whole like a roof tile, or a convex or concave shape A decorative plate having a curved shape can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating one embodiment of a transfer sheet of the present invention.

FIG. 2 is a conceptual diagram illustrating a transfer method using an elastic roller, which is a first method according to the method for manufacturing a decorative board of the present invention.

FIG. 3 is a conceptual diagram illustrating a transfer method using a collision pressure of solid particles, which is a second method according to the method for manufacturing a decorative board of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 support 2 release layer 3 decorative layer 3a picture layer 3b colored solid layer 4 transfer layer 10 substrate transport device 20 sheet feed device 21 sheet supply device 22 sheet support device 23 release roller 24 sheet discharge device 30 pressure application unit 31 hopper 32 Blower 33 Manifold 34 Blow-out nozzle 35 Chamber 36 Drain tube 37 Vacuum pump 40 Heating device B Transfer substrate D Decorative plate P Solid particle R Elastic roller R1 Shaft core R2 Elastic body S Transfer sheet

Claims (3)

[Claims] 1. A transfer sheet in which a resin film is used as a support and at least a release layer and a decorative layer are sequentially formed as a transfer layer on the support, wherein the release layer is a prepolymer of urethane acrylate and / or urethane methacrylate. A transfer sheet comprising a cross-linked and cured ionizing radiation-curable resin comprising an acrylic resin having no crosslinkable functional group and a polyester resin. 2. The transfer sheet according to claim 1, which is pressed from the support side by an elastic roller having a rubber hardness of 65 ° or less, so as to conform to the uneven shape of the surface of the transfer-receiving substrate having the uneven surface. And then bonding the transfer layer, followed by peeling and removing the support. 3. The transfer layer of the transfer sheet according to claim 1 is superimposed on an uneven surface of a substrate to be transferred having unevenness on its surface, and solid particles are caused to collide from the support side, and the collision pressure is applied. And a method of manufacturing a decorative plate in which a transfer sheet is formed following the irregular shape of the surface of the substrate to be transferred, the transfer layer is adhered, and then the support is peeled off.