JP4867744B2 - High pressure melamine resin decorative board - Google Patents

Description

  The present invention relates to a high-pressure melamine resin decorative board for building materials in which a design is imparted to the surface used for furniture, office desks, wall surfaces, flooring materials and the like.

Thermosetting resin decorative boards have excellent properties in impact resistance, stain resistance, pencil hardness, and the like. Specifically, high-pressure melamine resin decorative boards, low-pressure melamine resin decorative boards, diallyl phthalate (DAP) ) Resin decorative board, polyester decorative board, guanamine resin decorative board, phenolic resin decorative board, and the like. Among these, the high-pressure melamine resin decorative board has a hard surface, excellent heat resistance and stain resistance, and can be selected from a variety of design patterns, so it is widely used for table tops, sinks, desk tops, etc. in use.
High-pressure melamine resin decorative boards are generally impregnated with melamine resin on decorative paper with a pattern printed on the surface of the paper, with overlay paper impregnated with melamine resin on the surface of this decorative paper, and thermosetting such as phenolic resin on the back It is manufactured by stacking core paper impregnated with a base material such as kraft paper and sandwiching it between metal plates, and laminating at high temperature and high pressure.

However, in such a conventional melamine resin decorative board, since the manufacturing process is complicated and the production efficiency is low, the resin impregnation step to the decorative paper is omitted, and the overlay paper is applied to the surface of the decorative paper not impregnated with the resin, There has been proposed a melamine decorative board in which a core layer is stacked on the back surface and integrated by heating and pressurization (see Patent Documents 1 and 2). In these, a melamine resin decorative board is produced by fluidizing a melamine resin impregnated in an overlay paper by heat, partly penetrating into the decorative paper and integrating by thermal curing.
However, in the melamine decorative board, there is a problem in that the overlay paper conceals the pattern printing on the surface of the decorative paper and the design properties are lowered. Therefore, in order to solve this problem, a melamine decorative board is proposed, in which melamine resin-impregnated paper and a core layer are sequentially laminated on the back of decorative paper not impregnated with resin, and heat and pressure are integrated. (See Patent Document 3).

Japanese Patent Laid-Open No. 48-5866 JP-A-52-100576 JP-A-10-95091

The melamine decorative board obtained by laminating melamine resin-impregnated paper and core layer on the back of the decorative paper and heating and pressing does not cause deterioration of the design due to the overlay paper, but the surface of the decorative paper is important for the design Is in contact with the metal plate, and it has been a problem that the design properties deteriorate when high temperature and high pressure are applied. In particular, the wood grain pattern has a problem that it cannot synchronize with the wood grain pattern and the portion where the gloss difference is desired to be expressed.
An object of the present invention is to provide a high-pressure melamine resin decorative board that does not impair the design of the decorative sheet even when high temperature and high pressure are applied in the production process.

As a result of intensive research to achieve the above object, the present inventor has used the above-mentioned problem by using a decorative sheet having a low-gloss pattern ink layer and a cross-linked and cured surface protective layer of an ionizing radiation curable resin composition. I found out that it could be solved. The present invention has been completed based on such findings.
That is, the present invention
(1) A high-pressure melamine resin decorative board obtained by laminating a melamine resin-impregnated paper and a core layer in this order on the back surface of a decorative sheet and then heat-pressing the decorative sheet, at least partially on the base material The low gloss pattern ink layer provided and the low gloss pattern ink layer that is present on and in contact with the low gloss pattern ink layer and the low gloss pattern ink layer is not formed A surface protective layer covering the entire surface including the region, the surface protective layer is obtained by crosslinking and curing the ionizing radiation curable resin composition, and the surface protective layer includes the low gloss pattern ink layer. A high-pressure melamine resin decorative board, characterized in that a low-gloss area visually recognized as a concave portion is formed immediately above and in the vicinity thereof,
(2) A high-pressure melamine resin decorative board obtained by laminating a melamine resin-impregnated paper and a core layer in this order on the back surface of a decorative sheet and then heat-pressing the decorative sheet, wherein the decorative sheet is at least partially on the substrate. The low gloss pattern ink layer provided and the low gloss pattern ink layer that is present on and in contact with the low gloss pattern ink layer and the low gloss pattern ink layer is not formed A surface protective layer covering the entire surface including the region, the surface protective layer is a cross-linked and cured ionizing radiation curable resin composition, and the low gloss pattern ink constituting the low gloss pattern ink layer is used as a binder. A high-pressure melamine resin decorative board comprising a non-crosslinked urethane resin, and the ionizing radiation-curable resin composition contains a (meth) acrylate monomer,
(3) The high-pressure melamine resin decorative board according to the above (2), wherein the low-gloss pattern ink constituting the low-gloss pattern ink layer includes a non-crosslinked urethane resin and an unsaturated polyester resin as binders,
(4) The high-pressure melamine resin decorative board according to the above (2) or (3), wherein the ionizing radiation curable resin composition comprises only a (meth) acrylate monomer,
(5) The high-pressure melamine resin decorative board according to any one of (1) to (4), wherein the ionizing radiation curable resin composition is an electron beam curable resin composition,
(6) The decorative sheet has at least a pattern layer laminated on a substrate, and is present on and in contact with the low gloss pattern ink layer and the low gloss pattern ink layer, and the low gloss pattern ink. The high-pressure melamine resin decorative board according to any one of the above (1) to (5), which has a surface protective layer covering the entire surface including a region where the layer is formed and a region where the low gloss pattern ink layer is not formed And (7) the high-pressure melamine resin decorative board according to (6) above, wherein the pattern layer forms a wood grain pattern, and the low-gloss pattern ink layer forms a low-gloss portion of the conduit part,
Is to provide.

As a result of intensive research to achieve the above object, the present inventor has used the above-mentioned problem by using a decorative sheet having a low-gloss pattern ink layer and a cross-linked and cured surface protective layer of an ionizing radiation curable resin composition. I found out that it could be solved. The present invention has been completed based on such findings.
That is, the present invention
(1) A high-pressure melamine resin decorative board obtained by laminating a melamine resin-impregnated paper and a core layer in this order on the back surface of a decorative sheet and then heat-pressing the decorative sheet, wherein the decorative sheet has at least a pattern layer on the substrate. The low gloss pattern ink layer and the low gloss pattern ink layer exist on and contact with the low gloss pattern ink layer, and the low gloss pattern ink layer and the low gloss pattern ink layer are formed thereon. A surface protective layer that covers the entire surface including the uncovered region, the surface protective layer is a cured product of an ionizing radiation curable resin composition, and the surface protective layer includes the low gloss pattern Ri Na and low gloss area is formed that is recognized as a visually recess directly above and in the vicinity thereof of the ink layer, which pattern layer to form a grain pattern, low gloss low gloss pattern ink layer conduit portion characterized in that the form part High pressure melamine resin decorative plate which,
(2) A high-pressure melamine resin decorative board obtained by laminating a melamine resin-impregnated paper and a core layer in this order on the back surface of a decorative sheet and then heat-pressing the decorative sheet, wherein the decorative sheet has at least a pattern layer on the substrate. A low gloss pattern ink layer that is laminated and partially provided thereon, and is present on and in contact with the low gloss pattern ink layer, and the low gloss pattern ink layer is formed on the low gloss pattern ink layer and the low gloss pattern ink layer. A surface protective layer covering the entire surface including the area where the glossy pattern ink layer is not formed, the surface protective layer is a cross-linked and cured ionizing radiation curable resin composition, low gloss pattern ink is intended to include non-crosslinked urethane resin as a binder, see containing electrostatic ionizing radiation curable resin composition is a (meth) acrylate monomer and those pattern layer to form a grain pattern which constitutes Yes, low gloss painting High pressure melamine resin decorative plate, wherein the ink layer is to form a low gloss portion of the conduit section,
(3) The high-pressure melamine resin decorative board according to the above (2), wherein the low-gloss pattern ink constituting the low-gloss pattern ink layer includes a non-crosslinked urethane resin and an unsaturated polyester resin as binders,
(4) The high-pressure melamine resin decorative board according to the above (2) or (3), wherein the ionizing radiation curable resin composition comprises only a (meth) acrylate monomer,
(5) The high-pressure melamine resin decorative board according to any one of (2) to (4), wherein the ionizing radiation curable resin composition is an electron beam curable resin composition,
Is to provide.

The structure of the high-pressure melamine resin decorative board of the present invention will be described with reference to FIGS. As shown in FIG. 1, a high-pressure melamine resin decorative board 1 of the present invention is a resin decorative board obtained by laminating a melamine resin-impregnated paper 3 and a core layer 4 in this order on the back surface of a decorative sheet 2, and heating and pressing. It is.
In the present invention, the decorative sheet 2 is characterized by using a decorative sheet having a low-gloss pattern ink layer and a surface-curing layer obtained by crosslinking and curing an ionizing radiation curable resin composition. Here, the back surface of the decorative sheet 2 refers to the surface of the decorative sheet 2 on the base material side.
Hereinafter, the decorative sheet according to the present invention will be described in detail with reference to FIG. FIG. 2 is a schematic view showing a cross section of the decorative material sheet 2 according to the present invention.

  The decorative sheet 2 in the present invention is at least partially provided with a low gloss pattern ink layer 22 on a substrate 21, and is present on and in contact with the low gloss pattern ink layer. A decorative sheet having a surface protective layer 24 covering the entire surface including a region where an ink layer is formed and a region where the low gloss pattern ink layer is not formed, the surface protective layer 24 being an ionizing radiation curable resin The composition is crosslinked and cured, and in the surface protective layer, a low gloss region that is visually recognized as a concave portion is formed immediately above and near the low gloss pattern ink layer. Features.

In the example shown in FIG. 2, a uniform and uniform colored layer 25, a pattern layer 26, a uniform and uniform penetration preventing layer 27, a low gloss pattern ink layer 22, and an ionizing radiation curable resin composition covering the entire surface of the substrate 21. A surface protective layer 24 obtained by crosslinking and curing the product is laminated in this order. The low gloss pattern ink layer 22 is partially present, and a low gloss region 23 is formed in the surface protective layer immediately above and in the vicinity thereof. When this decorative sheet and the high-pressure melamine resin decorative plate 1 after heating and pressure molding are viewed from the surface protective layer 24 side, the low gloss region 23 is visually recognized as a concave portion, and the other regions are visually convex portions. Therefore, as a whole, the low gloss region 23 is visually recognized as an uneven pattern. The low gloss region 23 is represented by a set of points in the drawing.
Further, the upper part of the low gloss region 23 on the outermost surface of the surface protective layer 5 may be raised with the formation of the low gloss pattern ink layer 22 and may have a convex shape 28. Since the surface of the surface protective layer 24 has such a convex shape, light is scattered at this portion, so that the surface area is increased and the viewing angle for recognizing low gloss is widened. In addition, the visual unevenness is emphasized. In addition, although it does not specifically limit in the range with the effect of this invention about the height of this convex shape, Usually, it is the range of 2-3 micrometers.

  The extent of the spread of the low gloss region 23 formed in the surface protective layer 24 is not particularly limited as long as it is within the range where the effects of the present invention can be achieved. As shown in FIG. The surface protective layer 24 may remain in the middle of the thickness direction of the surface protective layer 24 or may reach the outermost surface of the surface protective layer 24.

The base material 21 used in the decorative sheet 2 according to the present invention is not particularly limited as long as it is a material that allows the melamine resin impregnated in the melamine resin-impregnated paper 3 to permeate in the process of manufacturing the melamine resin decorative board. Kraft paper, titanium paper, coated paper, art paper, sulfuric acid paper, glassine paper, parchment paper, paraffin paper, Japanese paper, and the like can be used, and those with high concealability such as titanium paper are particularly preferably used.
The thickness of the substrate 21, ranging from the viewpoint of permeability and concealment of 30 to 80 g / m ² of melamine resin is preferable, more preferably in the range of 50~60g / m ^2.

The uniform and uniform colored layer 25 covered over the entire surface shown in FIG. 2 is also referred to as a concealing layer or a full surface solid layer provided as desired for the purpose of improving the design of the decorative board of the present invention. . The colored layer 25 is formed when the color of the surface of the base material 21 is adjusted, and is formed when the base material 21 is colored or uneven in color, and gives the intended color to the surface of the base material 21. is there. Usually, it is formed with an opaque color, but it may be formed with a colored transparent color to make use of the pattern of the base. When making use of the fact that the base material 21 is white, or when the base material 21 itself is appropriately colored, it is not necessary to form the colored layer 25.
As the ink used for forming the colored layer, an ink in which a binder, a colorant such as a pigment or a dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, or a curing agent is appropriately mixed is used. The binder is not particularly limited, and examples thereof include polyurethane resins, vinyl chloride / vinyl acetate copolymer resins, vinyl chloride / vinyl acetate / acrylic copolymer resins, chlorinated polypropylene resins, acrylic resins, and polyesters. Arbitrary resins, polyamide resins, butyral resins, polystyrene resins, nitrocellulose resins, cellulose acetate resins and the like may be used alone or in combination of two or more.

Next, as the colorant, an inorganic or organic pigment having excellent durability that does not change color during hot pressing is preferable. Specifically, inorganic pigments such as yellow lead, cadmium yellow, yellow iron oxide, titanium oxide, bitumen, carbon black, red pattern, and organic pigments such as disazo pigments, isoindolinone, polyazo pigments, quinacridone, and phthalocyanine blue There is. In addition, pigments having pearly luster such as aluminum powder, copper powder, finely cut pieces of metal-deposited synthetic resin film, titanium dioxide-coated mica, fish scale foil, and the like can also be used.
The colored layer 25 is preferably a so-called solid print layer having a thickness of about 1 to 20 μm.

  In addition, in the ink used for forming the colored layer, silica, barium sulfate, kaolin, talc, carbonic acid are used in order to increase the adhesion between the layers of the ink coating and improve the impregnation of the thermosetting resin into the ink. An extender pigment such as calcium can also be added.

  As a printing method for forming the colored layer, any of normal printing such as gravure printing, flexographic printing, silk screen printing, and sheet printing can be applied. A preferred printing method is gravure rotary printing, which has a wide selection range of the ink binder and hardly affects the impregnation step of the thermosetting resin.

Next, the picture layer 26 shown in FIG. 2 gives decorativeness to the decorative board 1 of the present invention, and is formed by printing various patterns using ink and a printing machine. As patterns, there are stone patterns imitating the surface of rocks such as wood grain patterns, marble patterns (for example, travertine marble patterns), fabric patterns imitating cloth and cloth patterns, tiled patterns, brickwork patterns, etc. There are also patterns such as marquetry and patchwork that combine these. These patterns are formed by multicolor printing with the usual yellow, red, blue and black process colors, as well as by multicolor printing with special colors prepared by preparing the individual color plates that make up the pattern. Is done.
As the pattern ink used for the pattern layer 26, the same ink as that used for the colored layer 25 can be used. In the decorative board of the present invention, since the makeup can be applied by the low gloss pattern ink layer 22 and the low gloss region 23 described later in detail, the pattern layer 26 is not an essential component.

  The permeation preventing layer 27 shown in FIG. 2 is a layer provided as desired, and the ionizing radiation curable resin constituting the low gloss pattern ink constituting the low gloss picture ink layer 22 and the surface protective layer 24 described later, It has a function of suppressing permeation into the base material 21. Therefore, the penetration preventing layer 27 may be located between the base material 21 and the low gloss pattern ink layer 22, for example, between the base material 21 and the coloring layer 25, between the coloring layer 25 and the pattern layer 26, or shown in FIG. 2. As described above, the pattern layer 26 and the low gloss pattern ink layer 22 are provided. Usually, a uniform and uniform layer obtained by crosslinking and curing a curable resin, which has adhesiveness with the ionizing radiation curable resin constituting the surface protective layer 24, has a pattern layer 26 and a low gloss pattern ink layer as shown in FIG. 22 is provided. By this, when there is a colored layer 25, a pattern layer 26, etc. on the base material 21, the surface is smoothed, and the function of improving the adhesion between them and the low gloss pattern ink layer 22 and the surface protective layer 24 Is also fulfilled.

  The low gloss pattern ink layer 22 in the decorative sheet 2 according to the present invention is directly stacked on the base material 21 or is stacked on the colored layer 25, the pattern layer 26, the permeation prevention layer 27 and the like provided as necessary. It is a layer that causes a difference in gloss of the pattern.

The low gloss pattern ink forming the low gloss pattern ink layer 22 has a property capable of expressing an interaction such as elution, dispersion, and mixing with the ionizing radiation curable resin composition forming the surface protective layer 24. Yes, it is appropriately selected in relation to the ionizing radiation curable resin composition (uncured product). Specifically, an ink having a non-crosslinkable resin as the binder resin is preferable, and for example, a thermoplastic (non-crosslinked type) urethane resin is preferable. Here, the content of the urethane resin is 50% by mass or more from the viewpoint of further strengthening the interaction with the ionizing radiation curable resin composition forming the surface protective layer 24 and obtaining a further pattern gloss difference. More preferably it is.
As the urethane resin, a non-cross-linked type, that is, a three-dimensionally crosslinked thermoplastic resin having a linear molecular structure is selected instead of a network-like three-dimensional molecular structure. It is preferable to do. Examples of such non-crosslinked urethane resins include polyol components such as acrylic polyols, polyester polyols and polyether polyols, and isocyanate components such as tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate and other aromatic isocyanates, and isophorone diisocyanate. And a urethane resin obtained by reacting an isocyanate such as an aliphatic or alicyclic isocyanate such as hexamethylene diisocyanate and hydrogenated tolylene diisocyanate. Usually, the number of hydroxyl groups in one molecule of polyol and the number of isocyanate groups in one molecule of isocyanate are two on average. In addition, the average molecular weight of the urethane resin is about 10,000 to 50,000, and the glass transition temperature (Tg) is preferably about -70 to -40 ° C in order to develop a low gloss region.

  If necessary, in order to adjust the degree of expression of the low-gloss area and the contrast of the gloss difference between the low-gloss area and its surroundings, both saturated and unsaturated polyester resins, acrylic resins, and vinyl chloride-vinyl acetate are used. A polymer or the like can be mixed. Of these, polyester resins are preferable, and unsaturated polyester resins are particularly preferable. The addition amount of the unsaturated polyester resin is preferably in the range of 10 to 50% by mass with respect to the total amount of the binder of the low gloss design ink. Within this range, it is possible to obtain a sufficient enhancement effect for developing the low gloss region. The unsaturated polyester resin is not particularly limited as long as it is a reaction product of an unsaturated dicarboxylic acid and a glycol. Examples of the unsaturated dicarboxylic acid include maleic acid, fumaric acid, itaconic acid, and the like. Examples include ethylene glycol, diethylene glycol, propylene glycol, and butylene glycol.

  The low-gloss pattern ink forming the low-gloss pattern ink layer 22 has a colorant like the ink composition used in the colored layer 25 and the pattern layer 26, and can itself provide a pattern. In the case of having the colored layer 25 and the picture layer 26 as shown in FIG. 5, since the color and pattern are already given to the base material 21, the low gloss picture ink composition for forming the low gloss picture ink layer 22 is used. It is not always necessary to add a colorant and color. That is, when the pattern layer 26 is provided, the gloss difference is obtained by erasing the gloss of the pattern to be expressed by the pattern layer 26 and synchronizing the low gloss pattern ink layer 22 with the portion where the recess is visually expressed. A pattern having a visual recess is obtained. For example, when a wood grain pattern is to be expressed by the pattern layer 26, the conduit portion is visually recessed due to the gloss difference by synchronizing the ink portion of the low gloss pattern ink layer 22 with the wood grain conduit portion. A pattern is obtained. Alternatively, when a tiled pattern is to be expressed by the pattern layer 26, the joint groove portion is visually visualized by the difference in gloss by synchronizing the ink portion of the low gloss pattern ink layer 22 with the joint groove portion of the tile. The pattern which became a recessed part is obtained.

In addition, it is preferable that an extender pigment is contained in the low gloss pattern ink composition for forming the low gloss pattern ink layer 22. By containing extender pigments, it is possible to impart thixotropy to the low gloss pattern ink composition, and the shape of the low gloss pattern ink composition is maintained when the low gloss pattern ink layer 22 is printed using a plate. Is done. As a result, the sharpness of the unevenness at the end portion that transitions from the convex portion to the concave portion can be emphasized, and a sharp design expression is possible.
The extender pigment used in the present invention is not particularly limited, and is suitably selected from, for example, silica, talc, clay, barium sulfate, barium carbonate, calcium sulfate, calcium carbonate, magnesium carbonate and the like. Of these, silica, which is a material having a high degree of freedom in material design such as oil absorption, particle size, pore volume, etc., and excellent in designability, whiteness, and coating stability as an ink, is preferred. Is preferred. The average particle diameter of silica is preferably in the range of 0.1 to 5 μm. When it is 0.1 μm or more, the thixotropy of the ink does not become extremely high when it is added to the ink, and the viscosity of the ink does not increase too much, so that printing can be controlled easily. In addition, when trying to express the mattness of the conduit pattern portion, if the ink coating thickness of the conduit pattern portion is usually 5 μm or less and the average particle diameter of silica is smaller than the coating thickness, the head of the particle is relatively pressed down. Because it is inconspicuous, visual discomfort is unlikely to occur.
The content of these extender pigments in the low gloss pattern ink composition is preferably in the range of 5 to 15% by mass. When the content is 5% by mass or more, sufficient thixotropy can be imparted to the low gloss pattern ink composition, and when it is 15% by mass or less, the effect of imparting low gloss is not observed at all.
In addition, there is no restriction | limiting in particular as a measuring method of an average particle diameter, It can measure by well-known methods, such as a laser diffraction method, a coal counter method, and a precipitation method.

The coating amount of the low gloss pattern ink forming the low gloss pattern ink layer 22 is preferably in the range of 1 to 30 g / m ² . When it is 1 g / m ² or more, the interaction between the low-gloss pattern ink and the ionizing radiation curable resin composition occurs, and the low gloss region 23 is sufficiently obtained, so that a sufficient gloss difference on the surface of the decorative material is obtained. On the other hand, when it is 30 g / m ² or less, there is no mechanical restriction when printing low gloss pattern ink, and it is economically advantageous. From the above viewpoint, the coating amount of the low glossy picture ink is preferably in the further range of 2 to 20 g / m ^2, is preferably in the range especially of 5 to 10 g / m ^2.

Further, by changing the coating amount of the low-gloss pattern ink composition, the thickness of the ink constituting the low-gloss pattern ink layer 22 can be made non-uniform, and the extent of the recesses visually recognized thereby. However, it can be changed stepwise or continuously, and as a result, the pattern of the decorative material can be a gradation pattern in which the gloss difference changes stepwise or a continuous pattern in which the gloss difference changes continuously.
This is because the interaction between the low gloss pattern ink layer 22 and the surface protective layer 24 is relatively increased as the coating amount of the low gloss pattern ink layer 22 is relatively increased. This is probably because the gloss of the region 23 becomes lower. By such a method, it becomes possible to give more various textures.
The method of changing the thickness of the ink constituting the low gloss pattern layer 22 can usually be easily performed by changing the amount of ink applied, and by continuously changing the amount of ink applied, It is also possible to change the above stepwise change continuously and continuously.

Next, the surface protective layer 24 is composed of a material obtained by crosslinking and curing the ionizing radiation curable resin composition as described above. Here, the ionizing radiation curable resin composition is one having an energy quantum capable of crosslinking and polymerizing molecules in an electromagnetic wave or a charged particle beam, that is, crosslinking or curing by irradiating ultraviolet rays or electron beams. Refers to a resin composition. Specifically, it can be appropriately selected from polymerizable monomers, polymerizable oligomers or prepolymers conventionally used as ionizing radiation curable resin compositions.
Typically, as the polymerizable monomer, a (meth) acrylate monomer having a radically polymerizable unsaturated group in the molecule is suitable. By including the (meth) acrylate monomer, the low gloss pattern described above is used. Interaction with ink occurs, and a gloss difference of the pattern is suitably formed. The content of the (meth) acrylate monomer is more preferably 50% by mass or more from the viewpoint of further strengthening the interaction with the low gloss pattern ink and obtaining a further difference in gloss of the pattern. It is preferable that the ionizing radiation curable resin composition consists only of (meth) acrylate monomers.

  As the (meth) acrylate monomer, a polyfunctional (meth) acrylate is preferable. Here, “(meth) acrylate” means “acrylate or methacrylate”. The polyfunctional (meth) acrylate is not particularly limited as long as it is a (meth) acrylate having two or more ethylenically unsaturated bonds in the molecule. Specifically, ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) ) Acrylate, polyethylene glycol di (meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone-modified dicyclopentenyl di (meth) acrylate, ethylene oxide-modified phosphate di ( (Meth) acrylate, allylated cyclohexyl di (meth) acrylate, isocyanurate di (meth) acrylate, trimethylolpropane tri (meth) acrylate, ethylene oxide modified trimethylo Propane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide modified trimethylolpropane tri (meth) acrylate, tris ( Acryloxyethyl) isocyanurate, propionic acid modified dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, ethylene oxide modified dipentaerythritol hexa (meth) acrylate, caprolactone modified dipentaerythritol hexa (meth) acrylate, etc. Is mentioned. These polyfunctional (meth) acrylates may be used singly or in combination of two or more.

  In the present invention, a monofunctional (meth) acrylate can be used in combination with the polyfunctional (meth) acrylate as long as the object of the present invention is not impaired, for the purpose of lowering the viscosity. Examples of monofunctional (meth) acrylates include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl ( Examples include meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, and isobornyl (meth) acrylate. These monofunctional (meth) acrylates may be used alone or in combination of two or more.

  Next, as the polymerizable oligomer, an oligomer having a radical polymerizable unsaturated group in the molecule, for example, epoxy (meth) acrylate, urethane (meth) acrylate, polyester (meth) acrylate, polyether (meth) acrylate System oligomers and the like. Here, the epoxy (meth) acrylate oligomer can be obtained, for example, by reacting (meth) acrylic acid with an oxirane ring of a relatively low molecular weight bisphenol type epoxy resin or novolak type epoxy resin and esterifying it. . Further, a carboxyl-modified epoxy (meth) acrylate oligomer obtained by partially modifying this epoxy (meth) acrylate oligomer with a dibasic carboxylic acid anhydride can also be used. The urethane (meth) acrylate oligomer can be obtained, for example, by esterifying a polyurethane oligomer obtained by reaction of polyether polyol or polyester polyol and polyisocyanate with (meth) acrylic acid. Examples of polyester (meth) acrylate oligomers include esterification of hydroxyl groups of polyester oligomers having hydroxyl groups at both ends obtained by condensation of polycarboxylic acid and polyhydric alcohol with (meth) acrylic acid, It can be obtained by esterifying the terminal hydroxyl group of an oligomer obtained by adding an alkylene oxide to a carboxylic acid with (meth) acrylic acid. The polyether (meth) acrylate oligomer can be obtained by esterifying the hydroxyl group of the polyether polyol with (meth) acrylic acid.

Furthermore, other polymerizable oligomers include polybutadiene (meth) acrylate oligomers with high hydrophobicity that have (meth) acrylate groups in the side chain of polybutadiene oligomers, and silicone (meth) acrylate oligomers that have polysiloxane bonds in the main chain. In a molecule such as an aminoplast resin (meth) acrylate oligomer modified with an aminoplast resin having many reactive groups in a small molecule, or a novolak epoxy resin, bisphenol epoxy resin, aliphatic vinyl ether, aromatic vinyl ether, etc. There are oligomers having a cationic polymerizable functional group.
In the present invention, the interaction between the low gloss pattern ink constituting the low gloss pattern ink layer 22 and the ionizing radiation curable resin composition constituting the surface protective layer 24 is important. From this viewpoint, an appropriate ink and ionizing radiation are used. Although a curable resin composition is selected, the ionizing radiation curable resin composition preferably contains a polyfunctional (meth) acrylate monomer.

  The ionizing radiation curable resin used for the surface protective layer 24 preferably contains an ethylene oxide-modified polymerizable compound, and the surface protective layer contains calcined kaolin particles. Oil resistance is improved by using a resin containing an ethylene oxide-modified polymerizable compound for the ionizing radiation curable resin of this surface protective layer, and marring resistance is improved by including calcined kaolin particles in the surface protective layer. To do. That is, regarding the oil resistance, by using an ionizing radiation curable resin containing an ethylene oxide-modified polymerizable compound in the surface protective layer, the ethylene oxide portion of the compound is hydrophilic. The affinity with can be reduced. As a result, oil such as edible oil attached on the surface protective layer can be prevented from penetrating into the surface protective layer, and the decorative plate can be improved in oil resistance by the surface protective layer itself.

The ethylene oxide-modified polymerizable compound is a compound that can undergo a polymerization reaction with ionizing radiation and has an ethylene oxide-modified moiety, and as such an ethylene oxide-modified polymerizable compound, an appropriate compound depending on the application can be used. Use it. Specific examples of the ethylene oxide-modified polymer compound include trimethylolpropane ethylene oxide-modified tri (meth) acrylate, bisphenol A ethylene oxide-modified di (meth) acrylate, and the like.
In addition, the oil resistance increases as the chain number n (number per molecule) of the ethylene oxide repeating unit in the ethylene oxide modified portion increases, but on the other hand, the increase in hydrophilicity causes water resistance and water-based contamination such as water-based ink. Contamination resistance to objects is reduced. Therefore, the n number may be adjusted as appropriate. For example, n is 2 to 20, more preferably 4 to 15. The ethylene oxide-modified polymerization compound may be a bifunctional, trifunctional, or other functional number, for example, a compound having 4 or more functional groups. These may be determined by appropriately considering the film hardness required for the surface protective layer.

  As the ionizing radiation curable resin used for the surface protective layer 24, the total amount of resin capable of undergoing a polymerization reaction with ionizing radiation may be composed of an ethylene oxide-modified polymerization compound, but other physical properties other than oil resistance such as aqueous surface A polymerizable compound that can be polymerized with other ionizing radiations may be used in combination, as appropriate, in consideration of stain resistance against ink and the like. Specifically, the ethylene oxide-modified polymerizable compound alone increases the oil resistance due to the increased hydrophilicity of the surface protective layer, but on the other hand, the affinity for water-based substances increases and the water-resistant contaminants such as water-based inks are resistant to contamination. May decrease. In such a case, a polymerizable compound that is not hydrophilic, for example, an ethylene oxide non-modified acrylate monomer and / or prepolymer (ordinary acrylate monomer and / or prepolymer) may be blended. In the case where oil resistance and antifouling property against water pollutants are made compatible, the blending ratio is (ethylene oxide modified polymer compound) / (ethylene oxide non-modified polymer compound) = 3/7 to 5/5 (mass ratio) ) Is preferred. Propylene oxide is also an alkylene oxide compound similar to ethylene oxide, but when propylene oxide-modified compounds are used instead of ethylene oxide-modified compounds, the relative proportion of ether bonds decreases, so the tendency to increase hydrophilicity Little oil resistance is not obtained.

When an ultraviolet curable resin composition is used as the ionizing radiation curable resin composition, it is desirable to add about 0.1 to 5 parts by mass of the photopolymerization initiator with respect to 100 parts by mass of the resin composition. The initiator for photopolymerization can be appropriately selected from those conventionally used and is not particularly limited. For example, for a polymerizable monomer or polymerizable oligomer having a radically polymerizable unsaturated group in the molecule. Benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2 -Phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propane-1 - 4- (2-hydroxyethoxy) phenyl-2 (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4′-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2 -Tertiary butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethyl ketal, acetophenone dimethyl ketal It is done.
Examples of the polymerizable oligomer having a cationic polymerizable functional group in the molecule include aromatic sulfonium salts, aromatic diazonium salts, aromatic iodonium salts, metallocene compounds, and benzoin sulfonic acid esters.
Moreover, as a photosensitizer, p-dimethylbenzoic acid ester, tertiary amines, a thiol type sensitizer, etc. can be used, for example.

  In the present invention, it is preferable to use an electron beam curable resin composition as the ionizing radiation curable resin composition. This is because the electron beam curable resin composition can be made solvent-free, is more preferable from the viewpoint of environment and health, and does not require a photopolymerization initiator and can provide stable curing characteristics.

  Moreover, various additives can be mix | blended with the ionizing radiation-curable resin composition in this invention according to the desired physical property of the cured resin layer obtained. Examples of this additive include a weather resistance improver, an abrasion resistance improver, a polymerization inhibitor, a crosslinking agent, an infrared absorber, an antistatic agent, an adhesion improver, a leveling agent, a thixotropic agent, a coupling agent, A plasticizer, an antifoamer, a filler, a solvent, a coloring agent, etc. are mentioned.

  Here, as the weather resistance improving agent, an ultraviolet absorber or a light stabilizer can be used. The ultraviolet absorber may be either inorganic or organic, and as the inorganic ultraviolet absorber, titanium dioxide, cerium oxide, zinc oxide or the like having an average particle diameter of about 5 to 120 nm can be preferably used. Examples of the organic ultraviolet absorber include benzotriazole-based compounds, specifically 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-3,5-di-tert-). Amylphenyl) benzotriazole, 3- [3- (benzotriazol-2-yl) -5-tert-butyl-4-hydroxyphenyl] propionic acid ester of polyethylene glycol, and the like. On the other hand, examples of the light stabilizer include hindered amines, specifically 2- (3,5-di-tert-butyl-4-hydroxybenzyl) -2′-n-butylmalonate bis (1,2,2). , 6,6-pentamethyl-4-piperidyl), bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, tetrakis (2,2,6,6-tetramethyl-4-piperidyl)- 1,2,3,4-butanetetracarboxylate and the like. Further, as the ultraviolet absorber or light stabilizer, a reactive ultraviolet absorber or light stabilizer having a polymerizable group such as a (meth) acryloyl group in the molecule can be used.

Examples of the wear resistance improver include, for inorganic substances, spherical particles such as α-alumina, silica, kaolinite, iron oxide, diamond, and silicon carbide. Examples of the particle shape include a sphere, an ellipsoid, a polyhedron, a scale shape, and the like. Although there is no particular limitation, a spherical shape is preferable. Organic materials include synthetic resin beads such as cross-linked acrylic resin and polycarbonate resin. The particle size is usually about 30 to 200% of the film thickness. Among these, spherical α-alumina is particularly preferable because it has high hardness and a large effect on improving wear resistance, and it is relatively easy to obtain spherical particles.
Examples of the polymerization inhibitor include hydroquinone, p-benzoquinone, hydroquinone monomethyl ether, pyrogallol, and t-butylcatechol. Examples of the crosslinking agent include a polyisocyanate compound, an epoxy compound, a metal chelate compound, an aziridine compound, and an oxazoline compound. Used.
As the filler, for example, barium sulfate, talc, clay, calcium carbonate, aluminum hydroxide and the like are used.
Examples of the colorant include known coloring pigments such as quinacridone red, isoindolinone yellow, phthalocyanine blue, phthalocyanine green, titanium oxide, and carbon black.
As the infrared absorber, for example, a dithiol metal complex, a phthalocyanine compound, a diimmonium compound, or the like is used.

In the present invention, a polymerizable monomer, a polymerizable oligomer and various additives, which are the ionizing radiation curable components, are uniformly mixed at predetermined ratios to prepare a coating liquid composed of an ionizing radiation curable resin composition. To do. The viscosity of the coating solution is not particularly limited as long as it is a viscosity capable of forming an uncured resin layer on the surface of the substrate by a coating method described later.
In the present invention, the coating liquid prepared in this way is applied to the surface of the substrate so that the thickness after curing is 1 to 20 μm, gravure coating, bar coating, roll coating, reverse roll coating, Coating is performed by a known method such as comma coating, preferably gravure coating, to form an uncured resin layer. When the thickness after curing is 1 μm or more, a cured resin layer having a desired function is obtained. The thickness of the surface protective layer after curing is preferably about 2 to 20 μm.

In the present invention, the uncured resin layer thus formed is irradiated with ionizing radiation such as an electron beam and ultraviolet rays to cure the uncured resin layer. Here, when an electron beam is used as the ionizing radiation, the acceleration voltage can be appropriately selected according to the resin used and the thickness of the layer, but the uncured resin layer is usually cured at an acceleration voltage of about 70 to 300 kV. preferable.
In electron beam irradiation, the transmission capability increases as the acceleration voltage increases. Therefore, when using a base material that deteriorates due to the electron beam as the base material, the transmission depth of the electron beam and the thickness of the resin layer are substantially equal. By selecting the accelerating voltage so as to be equal to each other, it is possible to suppress the irradiation of the electron beam to the base material, and to minimize the deterioration of the base material due to the excessive electron beam.
The irradiation dose is preferably such that the crosslink density of the resin layer is saturated, and is usually selected in the range of 5 to 300 kGy (0.5 to 30 Mrad), preferably 10 to 50 kGy (1 to 5 Mrad).
The electron beam source is not particularly limited. For example, various electron beam accelerators such as a cockroft Walton type, a bandegraft type, a resonant transformer type, an insulated core transformer type, a linear type, a dynamitron type, and a high frequency type. Can be used.

When ultraviolet rays are used as the ionizing radiation, those containing ultraviolet rays having a wavelength of 190 to 380 nm are emitted. There is no restriction | limiting in particular as an ultraviolet-ray source, For example, a high pressure mercury lamp, a low pressure mercury lamp, a metal halide lamp, a carbon arc lamp, etc. are used.
The cured resin layer thus formed has various functions by adding various additives, for example, a so-called hard coat function, anti-fogging coat function, and anti-fouling coat having high hardness and scratch resistance. A function, an antiglare coating function, an antireflection coating function, an ultraviolet shielding coating function, an infrared shielding coating function, and the like can also be imparted.

Next, the melamine resin-impregnated paper used in the decorative board of the present invention may be any suitable paper containing melamine resin, and conventionally used overlay paper can be used.
As the thickness of the paper used here, one having a basis weight of about 25 to 120 g / m ² is used.
Moreover, as a melamine resin, it is necessary to fully infiltrate and integrate the decorative sheet 2 in the heating / pressurizing step, and it is preferable to use a resin having high fluidity under heating.

Moreover, as content of a melamine resin, the range of 200-400 mass parts is preferable with respect to 100 mass parts of paper. If it is 200 parts by mass or more, it is an amount that can sufficiently penetrate and integrate the decorative sheet 2 in the heating / pressurizing step, and if it is 400 parts by mass or less, it is preferable from the viewpoint of handling.
The melamine resin can be impregnated by an impregnation method using an ordinary impregnator, and then dried to produce a melamine resin-impregnated paper.

The core layer 4 disposed at the lower part of the melamine resin impregnated paper imparts the thickness and strength necessary for the decorative board, and heat such as phenol resin on unbleached kraft paper having a basis weight of about 100 to 200 g / m ^2. A core paper impregnated with a curable resin is preferably used. Although there is no restriction | limiting in particular as an impregnation amount of a phenol resin, Usually, it is about 20-50 mass%. The number of core papers is appropriately selected according to the thickness of the high-pressure melamine resin decorative board. Furthermore, the core paper can be heated and pressurized in advance to melt and solidify the resin, thereby smoothing the surface of the core paper.
In the present invention, it is also a preferred embodiment to use a melamine resin instead of the phenol resin.
In addition, as the core layer 4, for example, veneer of various materials such as cedar, firewood, firewood, pine, lawan, teak, melapie, etc., wood material such as wood veneer, wood plywood, particle board, medium density fiberboard (MDF), etc. Can also be used. These can be used alone or in a laminated manner.
A backer layer made of a fibrous base material or a wooden base material impregnated with a thermosetting resin may be provided on the back surface of the core layer 4 to prevent warping. For warping prevention, a method of bonding a synthetic resin film such as vinyl chloride, polyethylene, or polypropylene, a method of bonding a sheet composed of two layers of paper and a synthetic resin, and a paper substrate such as two thin papers And a method of laminating a paper-based sheet formed by adhesion through an extrusion coating layer of a polyolefin resin such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymer. In addition, there is a method in which a moisture-proof sheet composed of a synthetic resin base material layer and a vapor deposition layer is attached to the back surface of the core layer 4.

The decorative board 1 of the present invention is manufactured by laminating a melamine resin-impregnated paper 3 and a core layer 4 in this order on the back surface of a decorative sheet 2, and pressurizing and thermoforming them. The conditions such as pressure, heating pressure, temperature, and time can be appropriately selected depending on the type of the thermosetting resin selected, the core paper, overlay paper, and base material to be used at the same time. 9 MPa to 9.8 MPa (60 to 100 kg / cm ² ), the temperature is selected in the range of 110 to 160 ° C., and the time is about 10 to 60 minutes.

  The decorative board manufactured as described above can be arbitrarily cut and subjected to optional decoration such as grooving and chamfering on the surface and the end of the mouth using a cutting machine such as a router or a cutter. And various uses, for example, interior or exterior materials of buildings such as walls, ceilings, floors, window frames, doors, handrails, skirting boards, margins, surface decorative panels for fittings such as malls, kitchens, furniture, or light electrical appliances, It can be used for surface decorative boards of cabinets such as OA equipment, interiors and exteriors of vehicles.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by this example.
Example 1
(1) Manufacture of decorative sheet As base material 21, an impregnated paper with a basis weight of 60 g / m ² is used. On one side, an acrylic resin and nitrified cotton are used as a binder, and titanium white, petal, and yellow lead are used as colorants. Then, a (full-surface solid) layer having a coating amount of 5 g / m ² was applied by gravure printing to form a colored layer 25. A woodgrain pattern layer 26 was formed by gravure printing using an ink containing nitrified cotton as a binder and a colorant mainly composed of a dial.
Subsequently, using a coating composition having a polyisocyanate composed of a polyester urethane resin having a number average molecular weight of 20,000 and a glass transition temperature (Tg) of −59.8 ° C. and tolylene diisocyanate as a binder, the coating amount is 7 g / m. ² and gravure printing was performed on the entire surface to form a penetration preventing layer 27 (primer layer).
Next, 10 silica particles having an average particle diameter of 1.5 μm are added to 100 parts by mass of a transparent ink using a polyester urethane resin having a number average molecular weight of 30,000 and a glass transition temperature (Tg) of −62.8 ° C. as a binder. A low-gloss pattern ink layer 22 was formed by gravure printing so as to synchronize with the wood-condensed conduit portion using the ink composition blended in parts by mass.
On these ink layers, 60 parts by mass of ethylene oxide-modified trimethylolpropane ethylene oxide triacrylate as a trifunctional acrylate monomer, 40 parts by mass of dipentaerythritol hexaacrylate as a hexafunctional acrylate monomer, and silica particles having an average particle size of 5 μm An electron beam curable resin composition comprising 2 parts by mass and 1 part by mass of a silicone acrylate prepolymer was applied by a gravure offset coater method at a coating amount of 5 g / m ² . After the coating, an electron beam with an acceleration voltage of 175 kV and an irradiation dose of 50 kGy (5 Mrad) was irradiated to cure the electron beam curable resin composition, whereby a surface protective layer 24 was obtained. Next, curing was performed at 70 ° C. for 24 hours to obtain a decorative sheet 2.

(2) Manufacture of decorative board A commercially available sheet obtained by impregnating the back surface of the decorative sheet 2 obtained as described above with 300% by weight of melamine resin (manufactured by Cymel) on paper (made by Mead) having a basis weight of 22 g / m ² A melamine resin impregnated paper, a core layer made of kraft paper with a basis weight of 200 g / m ² impregnated with 30% by mass of phenol resin, and a backer layer made of melamine resin impregnated paper are stacked in this order and sandwiched between the end plates. The resin was permeated, cured and integrated by heating for 30 minutes under the conditions of a pressure of 7.8 MPa (80 kg / cm ² ) and a temperature of 147 ° C. to obtain a high-pressure melamine resin decorative board.

The resin decorative board of Example 1 was suitable for the matching of the wood conduit and low gloss, and the design of the printed paper was not lost even after pressing. Specifically, for the decorative sheet produced above and the resin decorative board produced using the decorative sheet, the gloss change was measured by the following method. As shown in Table 1, the decorative sheet and The change in gloss between the resin decorative plates is extremely small, and it was confirmed that the design properties, particularly the design properties of the conduits, are not impaired by heating and pressing (pressing) in the process of manufacturing the resin decorative plates.
(Gloss evaluation method)
Gross meter ("MMX-203" manufactured by Murakami Color Research Laboratory was used to measure the gloss value at an incident angle of 75 degrees. The higher the number, the higher the gloss (high gloss), the lower the number. Indicates low gloss (low gloss).
In addition, compared with general thin paper-coated paper, it is structurally harder than a laminate board, so it has excellent impact resistance, and since the paper gap is made of resin, the tape peelability is good.

Comparative Example 1
A decorative board was produced in the same manner as in Example 1 except that the low gloss pattern ink layer 22 was not formed. Compared with the decorative board of Example 1, the gloss difference between the grain pattern and the conduit in the grain pattern was unclear.

Comparative Example 2
Instead of the electron beam curable resin composition, 2 parts by mass of silica particles having an average particle diameter of 5 μm and 1 part by mass of silicone acrylate prepolymer were added to a thermosetting urethane resin (“UC Clear 120” manufactured by Dainippon Ink Co., Ltd.). A decorative board was produced in the same manner as in Example 1 except that the added thermosetting urethane resin composition was used.About the decorative sheet and the resin decorative board produced using the decorative sheet in the same manner as in Example 1. The gloss change was measured, and the results are shown in Table 1. The overall gloss was increased, the gloss difference between the wood grain pattern and the conduit in the wood grain pattern was lost, and the design property was lowered.

  ADVANTAGE OF THE INVENTION According to this invention, even if it applies high temperature and a high pressure in a manufacture process, the high pressure melamine resin decorative board which does not impair the design property of a decorative sheet can be provided. The decorative board is an interior or exterior material of a building such as a wall, a ceiling, or a floor, a window frame, a door, a handrail, a skirting board, a surrounding edge, a surface decorative board of a fitting such as a mall, kitchen, furniture, or light electrical appliance, OA equipment It is most suitable as a decorative sheet for building materials used for surface decorative panels of cabinets, etc., interiors and exteriors of vehicles.

It is a schematic diagram which shows the cross section of the decorative board of this invention. It is a schematic diagram which shows the cross section of the decorative sheet used with the decorative board of this invention.

Explanation of symbols

1. 1. High pressure melamine resin decorative board Cosmetic sheet 3. 3. Melamine resin impregnated paper Core layer 21. Base material 22. Low gloss pattern ink layer 23. Low gloss area 24. Surface protective layer 25. Colored layer 26. Pattern layer 27. Infiltration prevention layer 28. Convex shape

Claims (5)

A melamine resin-impregnated paper and a core layer are laminated in this order on the back surface of the decorative sheet, and a high-pressure melamine resin decorative board formed by heating and pressing, wherein the decorative sheet has at least a pattern layer laminated on the substrate, with its upper present in the partially low gloss pattern ink layer provided with low gloss pattern ink layer in contact with this, low gloss pattern ink layer is formed regions and low glossy picture ink layer A surface protective layer that covers the entire surface including the region where no ion is formed, the surface protective layer is a cross-linked and cured ionizing radiation curable resin composition, and the surface protective layer includes Ri Na and low gloss area is formed that is recognized as a straight top and visually recess in the vicinity of the low-gloss pattern ink layer is intended pattern layer to form a grain pattern, and Teitsuya pattern ink layer conduit Forming low-gloss parts High pressure melamine resin decorative plate, characterized in that. A melamine resin-impregnated paper and a core layer are laminated in this order on the back surface of the decorative sheet, and a high-pressure melamine resin decorative board formed by heating and pressing, wherein the decorative sheet has at least a pattern layer laminated on the substrate, A low gloss pattern ink layer partially provided thereon, a region on the low gloss pattern ink layer that is in contact with the low gloss pattern ink layer, and a region on which the low gloss pattern ink layer is formed, and the low gloss pattern ink A surface protective layer covering the entire surface including a region where no layer is formed, and the surface protective layer is obtained by crosslinking and curing the ionizing radiation curable resin composition. is intended gloss pattern ink comprises a non-crosslinked urethane resin as a binder, conductive ionizing radiation curable resin composition is observed containing a (meth) acrylate monomer, and is intended to pattern layer to form a grain pattern, low Glossy Pattern Inn High pressure melamine resin decorative plate, wherein the layer is to form a low gloss portion of the conduit section.   The high-pressure melamine resin decorative board according to claim 2, wherein the low-gloss pattern ink that constitutes the low-gloss pattern ink layer contains a non-crosslinked urethane resin and an unsaturated polyester resin as binders.   The high pressure melamine resin decorative board according to claim 2 or 3, wherein the ionizing radiation curable resin composition comprises only a (meth) acrylate monomer.   The high-pressure melamine resin decorative board according to any one of claims 1 to 4, wherein the ionizing radiation curable resin composition is an electron beam curable resin composition.

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