JP7180743B2 - Decorative sheets, decorative boards and decorative resin moldings - Google Patents

Description

TECHNICAL FIELD The present invention relates to a decorative sheet, a decorative board, and a decorative resin molding.

BACKGROUND ART Conventionally, a decorative sheet is laminated on the surface of various articles in order to impart design properties. For example, decorative sheets are laminated and used on the surfaces of wall covering materials used for walls of buildings, decorative floor materials used for floor surfaces, furniture, and the like.

A decorative sheet laminated on the surface of an article as described above is required to exhibit a three-dimensional design. As a decorative sheet exhibiting such a three-dimensional design, a pattern printed layer is provided on a base material, a resin layer containing a matting agent is provided on the entire surface, and a resin layer is further provided as a pattern printed layer. A decorative sheet that is partially provided so as to be synchronized has been proposed (see, for example, Patent Document 1).
. Such a decorative sheet is excellent in design, which gives a visual three-dimensional effect due to the contrast between the high-gloss part and the low-gloss (matte) part, but the surface is almost flat. , even when touched with a hand, a three-dimensional effect could not be obtained.

On the other hand, as a decorative sheet that gives a three-dimensional effect when touched with a hand, that is, exhibits an excellent tactile sensation, a pattern-printed layer, a transparent resin layer, and convex portions formed by thick printing are provided on a base material. A decorative material that is in tune with a pattern-printed layer has been proposed (see, for example, Patent Documents 2 and 3).

When forming convex portions by thick printing, inorganic particles such as silica, calcium carbonate, and aluminum hydroxide are added to the ink forming the convex portions to impart thixotropic properties to the ink. In addition to increasing transferability, it suppresses the denaturation of ink after transfer,
It is common practice to form a convex portion having a delicate shape with good reproducibility. However, in the case of the conventional decorative sheet, there is a problem that the inorganic particles added for imparting thixotropic properties cause whitening of the projections, loss of transparency, and impairing the sense of design. In particular, in the case of a decorative material having a structure in which the projections are aligned with the pattern layer, there is a problem that the whitened projections make the underlying pattern appear cloudy, greatly impairing the original design of the pattern layer.

JP-A-9-174795 JP-A-10-86313 JP 2013-123863 A

An object of the present invention is to provide a decorative sheet having a high design property and exhibiting an excellent tactile sensation, a decorative board obtained by attaching the decorative sheet to an adherend, and a laminate obtained by laminating the decorative sheet on a molded resin layer. An object of the present invention is to provide a decorative resin molded article.

The inventors of the present invention have made intensive studies to develop a decorative sheet that has a high degree of design and an excellent tactile feel. By laminating a resin layer and forming a convex portion containing a resin and organic particles on the transparent resin layer,
We have found that the above problems can be solved. The present invention has been completed based on such findings.

That is, the present invention relates to the following decorative sheet, decorative board, and decorative resin molding.
1. A first resin layer containing a matting agent, a second resin layer partially provided on the first resin layer, and a resin and organic particles provided on the second resin layer on the base sheet. A decorative sheet having projections in this order.
2. 2. The decorative sheet according to item 1, wherein the content of the organic particles is 50% by mass or less of the solid content of the resin composition forming the protrusions.
3. 3. The decorative sheet according to item 1 or 2, wherein the content of the organic particles is 2% by mass or more of the solid content of the resin composition forming the protrusions.
4. 4. The decorative sheet according to any one of items 1 to 3, wherein the organic particles have an average particle size of 15 to 50 μm.
5. 5. The decorative sheet according to any one of items 1 to 4, wherein the area provided with the convex portion is 5 to 80% of the area of the second resin layer.
6. 6. The decorative sheet according to any one of items 1 to 5, wherein the second resin layer has a gloss higher than that of the first resin layer.
7. 7. The decorative sheet according to any one of items 1 to 6, wherein the second resin layer contains a matting agent.
8. The mass of the matting agent contained per unit mass of the solid content of the resin composition forming the second resin layer is the matting content per unit mass of the solid content of the resin composition forming the first resin layer Item 8. The decorative sheet according to Item 7, having a mass smaller than that of the erasing agent.
9. 9. The decorative sheet according to any one of items 1 to 8, which has a pattern layer between the base sheet and the first resin layer.
10. Item 9 above, wherein the second resin layer is provided in synchronization with the pattern of the pattern layer.
The cosmetic sheet described in .
11. 11. The decorative sheet according to item 9 or 10, wherein the picture pattern layer is a wood grain pattern, and the second resin layer is provided on a portion of the wood grain pattern other than the winter grain pattern and/or the vessel pattern.
12. A decorative board having the decorative sheet according to any one of items 1 to 11 on an adherend.
13. 12. A decorative resin molded article having the decorative sheet according to any one of items 1 to 11 on a molded resin layer.

The decorative sheet of the present invention includes a first resin layer containing a matting agent and partially laminated with a second resin layer having a higher gloss than the first resin layer, and a resin layer on the second resin layer. And the structure in which the protrusions containing the organic particles are laminated, it is possible to have a high design property and to exhibit an excellent tactile sensation.

BRIEF DESCRIPTION OF THE DRAWINGS It is a cross-sectional schematic diagram which shows an example of layer structure of the decorative sheet of this invention.

The decorative sheet, decorative board and decorative resin molded product of the present invention are described in detail below.

1. Decorative Sheet The decorative sheet of the present invention comprises a base sheet, a first resin layer containing a matting agent, a second resin layer partially provided on the first resin layer, and the second resin layer. It is characterized by having convex portions containing resin and organic particles provided thereon in this order.

In the decorative sheet of the present invention having the above characteristics, the second resin layer is partially laminated on the first resin layer containing the matting agent, and the area laminated with the second resin layer is laminated. There is a difference in luster between the area where it is not applied, and it has a high designability (gloss matte expression). Furthermore, the decorative sheet of the present invention having the above characteristics exhibits an excellent tactile sensation without impairing the gloss matte expression described above, because the protrusions containing the resin and the organic particles are laminated on the second resin layer. be able to.

The decorative sheet of the present invention has a first resin layer, a second resin layer and projections in this order on a base sheet, and a second resin layer and a second resin layer on the first resin layer. If a convex part is formed on the top,
Its specific configuration (layer configuration) is not limited. For example, a pattern layer can be provided between the base sheet and the first resin layer. Specifically, it is a decorative sheet in which a picture pattern layer is laminated on a base sheet, and a first resin layer, a second resin layer and projections are formed in this order on the picture pattern layer. FIG. 1 shows one example of the layer structure of the decorative sheet of the present invention. In FIG. 1, the decorative sheet 1 of the present invention comprises a base sheet 2, a pattern layer 3, a first
A resin layer 4 and a second resin layer 5 are laminated in this order, and a convex portion 6 is formed on the second resin layer 5 .

Hereinafter, each layer constituting the decorative sheet will be described with reference to FIG. In the present invention, the direction in which the protrusions are formed when viewed from the base sheet is referred to as "upper" or "front surface", and the direction opposite to the direction in which the protrusions are formed when viewed from the base sheet. is called "lower" or "back". Further, in the following description, the lower and upper limits of the numerical range represented by "-" means "more than or equal to or less than" (for example, α to β means greater than or equal to α and less than or equal to β).

The base material sheet is not limited, and a fiber sheet, a plastic base material, a metal base material, a wood base material, or the like can be used.

As the fibrous sheet, known fibrous sheets such as thin paper, reinforced paper, impregnated paper, titanium paper, coated paper, corrugated paper, linter paper, kraft paper, and fine paper can be used.
Specifically, general wallpaper paper (a pulp-based sheet sized with a known sizing agent); flame-retardant paper (a pulp-based sheet treated with a flame retardant such as guanidine sulfamate or guanidine phosphate). ); inorganic paper containing inorganic additives such as aluminum hydroxide and magnesium hydroxide; fine paper; thin paper; The fibrous sheet used in the present invention includes those classified as non-woven fabrics.

Plastic substrates include polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, acrylonitrile butadiene styrene (ABS),
Various plastic sheets and films such as polyvinyl chloride, acrylic and polycarbonate can be used. As the metal substrate, a substrate obtained by undercoating a colorant on a steel plate, aluminum, stainless steel, or the like can be commercialized. Wood-based substrates include plywood, particle board, medium-density fiberboard, and the like.

The basis weight of the base material sheet is not limited, and is preferably about 20 to 300 g/m ² , more preferably 50 to 3
About 00 g/m ² is more preferable, and about 50 to 130 g/m ² is even more preferable.

When the decorative sheet of the present invention is used for injection molding or vacuum molding, it is preferable to use a plastic substrate as the substrate sheet in consideration of three-dimensional moldability. , films and the like are particularly preferred. In consideration of three-dimensional moldability, the thickness of the base sheet is preferably about 50-800 μm, more preferably about 100-600 μm.

Patterned Layer The decorative sheet of the present invention may have a patterned layer formed thereon, if desired. The pattern layer is usually provided on the front surface side of the base sheet, but when using a base sheet having transparency,
It may be provided on the back side of the base sheet. In addition, in the decorative sheet of the present invention, the pattern layer and the second resin layer are arranged in synchronism, so that the decorative sheet has a more excellent design. Specifically, as shown in FIG. 1, the second resin layer may be aligned with the portion of the pattern layer where the pattern is not formed, or conversely, the pattern of the pattern layer may be formed. A configuration in which the second resin layer is aligned with the portion where the second resin layer is formed may also be used.

The pattern layer imparts a design to the decorative sheet. Examples of pattern patterns include wood grain patterns,
Leather pattern, stone pattern, grain pattern, tile pattern, brickwork pattern, texture pattern, geometric figures,
Characters, symbols, abstract patterns, flower patterns, etc. can be mentioned, and can be selected according to the purpose.

The pattern layer can be formed, for example, by printing a pattern. Examples of printing methods include gravure printing, offset printing, silk screen printing, flexographic printing, electrostatic printing, and inkjet printing. As printing ink,
An ink obtained by dissolving (or dispersing) a known colorant (dye or pigment) in a solvent (or dispersion medium) together with a binder resin can be used.

Examples of coloring agents used in ink include inorganic pigments such as carbon black, titanium white, zinc oxide, red iron oxide, Prussian blue, and cadmium red; azo pigments, lake pigments, anthraquinone pigments, quinacridone pigments, phthalocyanine pigments, isoindolinone. Organic pigments such as pigments and dioxazine pigments; metal powder pigments such as aluminum powder and bronze powder; pearlescent pigments such as titanium oxide-coated mica and bismuth oxide chloride; fluorescent pigments; These colorants are
They can be used singly or in combination of two or more. These colorants may be used together with fillers such as silica, extender pigments such as organic beads, neutralizers, surfactants and the like. The content of the colorant is preferably about 10 to 100 parts by mass with respect to 100 parts by mass of the resin component, and 15 to 100 parts by mass.
About 50 parts by mass is more preferable.

The binder resin can be set according to the type of base sheet. As the binder resin, in addition to hydrophilic polyester-based urethane resin, polyester, polyacrylate, polyvinyl acetate, polybutadiene, polyvinyl chloride, chlorinated polypropylene,
Polyethylene, polystyrene, polystyrene-acrylate copolymers, rosin derivatives, alcohol adducts of styrene-maleic anhydride copolymers, cellulose resins, casein resins and the like can also be used in combination. More specifically, for example, polyacrylamide resin, poly(meth)
Acrylic acid-based resins, polyethylene oxide-based resins, poly N-vinylpyrrolidone-based resins, water-soluble polyester-based resins, water-soluble polyamide-based resins, water-soluble amino-based resins, water-soluble phenolic resins, other water-soluble synthetic resins; Water-soluble natural polymers such as nucleotides, polypeptides, polysaccharides; and the like can also be used. Also, for example, natural rubber, synthetic rubber, polyvinyl acetate resin, (meth)acrylic resin, polyvinyl chloride resin, polyurethane-polyacrylic resin, etc. modified or mixtures of the above natural rubbers, etc. Resin can be used. The binder resin can be used alone or in combination of two or more. In addition, "(meth) acrylic" shall mean acrylic or methacrylic,
The same applies hereinafter.

Examples of the solvent (or dispersion medium) include n-hexane, n-heptane, n-octane,
petroleum-based organic solvents such as toluene, xylene, ethylbenzene, cyclohexane, and methylcyclohexane; ester-based organic solvents such as ethyl acetate, butyl acetate, 2-methoxyethyl acetate, and 2-ethoxyethyl acetate; methyl alcohol, ethyl alcohol, n -Alcohol organic solvents such as propyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol and propylene glycol; Ketone organic solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; Ether organic solvents such as diethyl ether, dioxane and tetrahydrofuran chlorinated organic solvents such as dichloromethane, carbon tetrachloride, trichlorethylene and tetrachlorethylene; and inorganic solvents such as water. These solvents (or dispersion media) can be used alone or in combination of two or more.

The thickness of the pattern layer is not particularly limited, and can be appropriately set according to product characteristics. For example, the layer thickness at the time of coating is about 1 to 200 μm, and the layer thickness after drying is about 0.1 to 20 μm.

First resin layer In the decorative sheet of the present invention, on the base sheet or pattern layer, for the purpose of adjusting luster, etc.,
It has a first resin layer containing a matting agent. The first resin layer is formed on the base sheet or pattern layer as a solid print layer on the entire surface. Examples of resins constituting the first resin layer include phenol resins, urea resins, diallyl phthalate, melamine resins, guanamine resins, unsaturated polyester resins, polyurethane resins, epoxy resins, aminoalkyd resins, melamine-
Urea cocondensate, silicon resin, polysiloxane, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylate copolymer, ionomer , polymethylpentene, acrylic acid ester, methacrylic acid ester, polycarbonate, cellulose triacetate, and the like. Alternatively, the first resin layer may be formed using an ionizing radiation curable resin. The ionizing radiation-curable resin is not limited as long as it is a resin that undergoes a cross-linking polymerization reaction when irradiated with ionizing radiation and changes into a three-dimensional polymer structure. For example, one or more of prepolymers, oligomers and monomers having polymerizable unsaturated bonds or epoxy groups in the molecule that can be crosslinked by irradiation with ionizing radiation can be used. Examples thereof include acrylate resins such as urethane acrylate, polyester acrylate and epoxy acrylate; silicone resins such as siloxane; polyester resins; and epoxy resins. These resins can be used alone or in combination of two or more.

Ionizing radiation includes visible light, ultraviolet rays (near ultraviolet rays, vacuum ultraviolet rays, etc.), X-rays, electron beams,
There are ion beams and the like, and among these, ultraviolet rays and/or electron beams are desirable.

Ultra-high pressure mercury lamps, high pressure mercury lamps, low pressure mercury lamps, carbon arc lamps, black light fluorescent lamps, and metal halide lamps can be used as ultraviolet light sources. The wavelength of ultraviolet rays is about 190 to 380 nm.

As the electron beam source, for example, various electron beam accelerators such as Cockcroftwald type, Vandegraft type, resonance transformer type, insulating core transformer type, linear type, dynamitron type, and high frequency type can be used. The electron beam energy is preferably about 100 to 1000 keV.
About 0 to 300 keV is more preferable. The electron beam irradiation dose is preferably about 1 to 15 Mrad, more preferably about 1 to 10 Mrad, and even more preferably about 3 to 5 Mrad.

Ionizing radiation-curable resins are sufficiently cured by irradiation with electron beams, but when curing by irradiation with ultraviolet rays, it is preferable to add a photopolymerization initiator (sensitizer).

Photoinitiators for resin systems having radically polymerizable unsaturated groups include, for example, acetophenones, benzophenones, thioxanthones, benzoin, benzoin methyl ether, Michler benzoyl benzoate, Michler ketone, diphenyl sulfide, dibenzyl disulfide. , diethyl oxide, triphenylbiimidazole, isopropyl-N,N-dimethylaminobenzoate and the like can be used. In the case of a resin system having a cationic polymerizable functional group, for example, at least one of aromatic diazonium salts, aromatic sulfonium salts, metallocene compounds, benzoinsulfonic acid esters, freeloxysulfoxonium diallyiodosyl salts, and the like. can be used.

Although the amount of the photopolymerization initiator added is not particularly limited, it is generally about 0.1 to 10 parts by weight per 100 parts by weight of the ionizing radiation-curable resin.

The first resin layer contains a matting agent. The matting agent is not particularly limited, and a wide range of known matting agents can be used. Examples of matting agents include inorganic particles such as silica, alumina, calcium carbonate, magnesium carbonate, aluminosilicate, and barium sulfate; resin (organic) particles such as acrylic beads, polyethylene, urethane resin, polycarbonate, polyamide (nylon), and the like. mentioned. The average particle size of the particles is preferably 0.5-20 μm, more preferably 0.5-10 μm. The amount of the matting agent added is preferably 2 to 40% by mass, more preferably 5 to 30% by mass, based on the resin composition (excluding the solvent) forming the first resin layer.
% by mass. The shape of the particles may be polyhedral, spherical, scaly, or the like. Among the above inorganic particles and organic particles, silica is preferred.

The thickness of the first resin layer is usually about 0.5 to 10 μm, but may exceed the above range depending on the application of the decorative sheet.

When the decorative sheet of the present invention is used for injection molding or vacuum molding, from the viewpoint of improving the scratch resistance of the decorative sheet and improving the three-dimensional moldability, the ionizing radiation curable resin constituting the first resin layer It is preferable to use polycarbonate (meth)acrylate as the material.
Polycarbonate (meth)acrylates are not particularly limited as long as they have a carbonate bond in the polymer main chain and two or more (meth)acrylates in the terminals or side chains. meth)acrylate and the like. Moreover, the polycarbonate (meth)acrylate preferably has 2 to 6 functional groups per molecule from the viewpoint of improving cross-linking and curing. Such polycarbonate (meth)acrylates may be used singly or in combination of two or more. Moreover, the urethane (meth)acrylate having a polycarbonate skeleton can be obtained, for example, by reacting a polycarbonate polyol, a polyvalent isocyanate compound, and a hydroxy (meth)acrylate.

Further, when the decorative sheet of the present invention is used for injection molding or vacuum molding, from the viewpoint of improving the scratch resistance of the decorative sheet and improving the three-dimensional moldability, the first resin layer is mixed with an ionizing radiation curable resin and heat treated. A mixture with a plastic resin is also preferable. Examples of thermoplastic resins include acrylic resins, urethane resins, and olefin resins, with acrylic resins being particularly preferred.
The mixing ratio of the ionizing radiation curable resin and the thermoplastic resin is 10:90 to 75: by mass.
About 25 is preferable, and about 25:75 to 50:50 is more preferable.

Second resin layer The decorative sheet of the present invention has a second resin layer for the purpose of adjusting luster. The second resin layer is partially provided on the first resin layer, and forms areas where the first resin layer containing the matting agent is exposed and areas where the first resin layer is not exposed. A high degree of designability is imparted to the decorative sheet of the present invention by producing a gloss difference. From the viewpoint of obtaining a more excellent design, it is preferable that the second resin layer has a gloss higher than that of the first resin layer. The second resin layer is preferably a transparent resin layer. The second resin layer is not particularly limited as long as it is transparent, and includes any of colorless and transparent, colored and translucent, and the like. Examples of the resin constituting the second resin layer include phenol resin, urea resin, diallyl phthalate, melamine resin, guanamine resin,
Unsaturated polyester resin, polyurethane resin, epoxy resin, aminoalkyd resin, melamine-urea cocondensate, silicon resin, polysiloxane, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene - acrylic acid copolymers, ethylene-acrylic acid ester copolymers, ionomers, polymethylpentene, acrylic acid esters, methacrylic acid esters,
Polycarbonate, cellulose triacetate and the like can be mentioned. Also, the ionizing radiation-curable resin described above may be used. These resins can be used alone or in combination of two or more.

The second resin layer can contain a matting agent for gloss adjustment. When the second resin layer contains a matting agent, the content of the matting agent in the second resin layer is preferably less than the content of the matting agent in the first resin layer. By making the content of the matting agent in the second resin layer smaller than the content of the matting agent in the first resin layer, the gloss of the second resin layer is made higher than that of the first resin layer, and an excellent design is obtained. It becomes easier to obtain sex. As the matting agent used in the second resin layer, the same matting agents as those listed for the first resin layer can be used. The amount of the matting agent added is preferably 0.5 to 20% by mass, more preferably 1 to 1%, based on the resin composition (excluding the solvent) forming the second resin layer.
5% by mass. The content of the matting agent in the second resin layer less than the content of the matting agent in the first resin layer is included per unit mass of the solid content of the resin composition forming the second resin layer. It means that the mass of the matting agent contained is smaller than the mass of the matting agent contained per unit mass of the solid content of the resin composition forming the first resin layer.

When the picture pattern layer is present, it is preferable that the second resin layer is provided in synchronization with the pattern of the picture pattern layer. A decorative sheet having a more excellent design can be obtained by adopting a structure in which the picture pattern layer and the second resin layer are in harmony with each other. Specifically, as shown in FIG. 1, the second resin layer may be aligned with the portion of the pattern layer where the pattern is not formed, or conversely, the pattern of the pattern layer may be formed. A configuration in which the second resin layer is aligned with the portion where the second resin layer is formed may also be used.

In the decorative sheet of the present invention, the picture pattern layer has a wood grain pattern, and a second resin layer having a gloss higher than that of the first resin layer is provided on the portion other than the winter grain pattern and/or the vessel pattern of the wood grain. preferably. As a result, the luster of the winter grain pattern and/or vessel pattern portion of the wood grain is lowered, so that excellent design properties similar to those of natural wood can be obtained. In order to form the second resin layer as described above, the same winter grain pattern and/or conduit pattern as the picture pattern layer is reversed (
That is, it is preferable to use a negative plate and print using a known printing method. As a printing method, a gravure printing method, a screen printing method, or the like is preferable.

The second resin layer may be colored as long as it has transparency, but it is preferable not to add a coloring agent.

The thickness of the second resin layer is usually about 0.5 to 10 μm, but may exceed the above range depending on the use of the decorative sheet.

When the decorative sheet of the present invention is used for injection molding or vacuum molding, from the viewpoint of improving the scratch resistance of the decorative sheet and improving the three-dimensional moldability, the ionizing radiation curable resin constituting the second resin layer It is preferable to use polycarbonate (meth)acrylate as the material.
The same polycarbonate (meth)acrylate as described in the section of the first resin layer can be used.

When the decorative sheet of the present invention is used for injection molding or vacuum molding, from the viewpoint of improving the scratch resistance of the decorative sheet and improving the three-dimensional moldability, the second resin layer is combined with an ionizing radiation curable resin and heat treated. A mixture with a plastic resin is also preferable. The kind of the thermoplastic resin and the preferred mixing ratio of the ionizing radiation-curable resin and the thermoplastic resin are the same as those described in the section of the first resin layer.

Projections In the decorative sheet of the present invention, projections containing resin and organic particles are formed on the second resin layer. The convex portion in the present invention is preferably formed as a so-called build-up printing layer by build-up printing so as to express a desired design. In the present invention, the convex portion means a form shown in a convex shape in a cross-sectional schematic diagram as shown in FIG. However, it also includes a form in which projections are formed by extending linearly, such as a conduit pattern.

The height of the projections of the decorative sheet of the present invention is preferably 5 from the viewpoint of expressing excellent tactile sensation.
μm or more, more preferably 10 μm or more, still more preferably 15 μm or more, and particularly preferably 20 μm or more. A preferable upper limit of the height of the convex portion is 50 μm, and a more preferable upper limit is 40 μm. By setting the upper limit of the height of the protrusions within the above range, the decorative sheet of the present invention can exhibit excellent tactile sensation and stabilize the tactile sensation. In this specification, the height of the convex portion is determined by observing the cross section of the decorative sheet with a scanning electron microscope (SEM).
It is a value calculated as an average value of 0 point measurement values.

The resin forming the protrusions is preferably a curable resin such as a thermosetting resin or an ionizing radiation curable resin (e.g., an electron beam curable resin) from the viewpoint of suppressing deformation of the protrusions and forming a desired shape. . In particular, ionizing radiation-curable resins are preferable from the viewpoint of high surface hardness, productivity, and the like.

Thermosetting resins include, for example, unsaturated polyester resins, polyurethane resins (including two-component curing polyurethanes), epoxy resins, aminoalkyd resins, phenolic resins, urea resins, diallyl phthalate resins, melamine resins, guanamine resins, and melamine. - urea co-condensation resin, silicone resin, polysiloxane resin and the like.

A crosslinking agent, a curing agent such as a polymerization initiator, and a polymerization accelerator can be added to the above resin.
For example, as curing agents, isocyanates, organic sulfonates, etc. can be added to unsaturated polyester resins, polyurethane resins, etc., and organic amines, etc. can be added to epoxy resins. Peroxides such as methyl ethyl ketone peroxide and radical initiators such as azoisobutylnitrile can be added to the unsaturated polyester resin.

As a method for forming convex portions with a thermosetting resin, for example, a thermosetting resin solution is applied by a coating method such as a roll coating method, a gravure coating method, a gravure printing method, a silk screen printing method, etc., followed by drying and curing. method.

The ionizing radiation-curable resin is not limited as long as it is a resin that undergoes a cross-linking polymerization reaction when irradiated with ionizing radiation and changes into a three-dimensional polymer structure. For example, one or more of prepolymers, oligomers and monomers having polymerizable unsaturated bonds or epoxy groups in the molecule that can be crosslinked by irradiation with ionizing radiation can be used. Examples of such ionizing radiation-curable resins include acrylate resins such as urethane acrylate, polyester acrylate and epoxy acrylate; silicone resins such as siloxane; polyester resins; and epoxy resins.

Ionizing radiation includes visible light, ultraviolet rays (near ultraviolet rays, vacuum ultraviolet rays, etc.), X-rays, electron beams,
There are ion beams and the like, and among these, ultraviolet rays and/or electron beams are desirable.

Ultra-high pressure mercury lamps, high pressure mercury lamps, low pressure mercury lamps, carbon arc lamps, black light fluorescent lamps, and metal halide lamps can be used as ultraviolet light sources. The wavelength of ultraviolet rays is about 190 to 380 nm.

As the electron beam source, for example, various electron beam accelerators such as Cockcroftwald type, Vandegraft type, resonance transformer type, insulating core transformer type, linear type, dynamitron type, and high frequency type can be used. The electron beam energy is preferably about 100 to 1000 keV.
About 0 to 300 keV is more preferable. The electron beam irradiation dose is preferably about 1 to 15 Mrad, more preferably about 1 to 10 Mrad, and even more preferably about 3 to 5 Mrad.

Ionizing radiation-curable resins are sufficiently cured by irradiation with electron beams, but when curing by irradiation with ultraviolet rays, it is preferable to add a photopolymerization initiator (sensitizer).

When the ionizing radiation-curable resin is a resin having a radically polymerizable unsaturated group, photopolymerization initiators include, for example, acetophenones, benzophenones, thioxanthones, benzoin, benzoin methyl ether, Michler benzoyl benzoate, and Michler ketone. , diphenyl sulfide, dibenzyl disulfide, diethyl oxide, triphenylbiimidazole, isopropyl-N,N-dimethylaminobenzoate, and the like can be used. Further, when the ionizing radiation-curable resin is a resin having a cationic polymerizable functional group, the photopolymerization initiator may be, for example, an aromatic diazonium salt, an aromatic sulfonium salt, a metallocene compound, a benzoinsulfonic acid ester, a freeloxy At least one such as sulfoxonium diallyliodosyl salt can be used.

The amount of the photopolymerization initiator to be added is not particularly limited, and is generally about 0.1 to 10 parts by weight with respect to 100 parts by weight of the ionizing radiation-curable resin.

As a method for forming the projections with the ionizing radiation-curable resin, for example, a solution of the ionizing radiation-curable resin is applied by a coating method such as a roll coating method, a gravure coating method, a gravure printing method, a silk screen printing method, etc., and if necessary, A method of curing by irradiation with ionizing radiation after drying may be mentioned.

The protrusions preferably contain organic particles having an average particle diameter of 15 to 50 μm in a proportion of 50% by mass or less in the solid content of the resin composition forming the protrusions, and are contained in a proportion of 40% by mass or less. is more preferred. When the content of the organic particles is 50% by mass or less, the coating film (
Since the organic particles are uniformly distributed on the convex portion, the tactile sensation is stable. The content of the organic particles is 50
If it exceeds mass %, the organic particles may aggregate, the height of the protrusions may not be stable, and the transparency of the protrusions may be impaired, which may deteriorate the design. The content of the organic particles is preferably 2% by mass, more preferably 10% by mass or more. If the content of the organic particles is less than 2% by mass, the tactile sensation will be insufficient, and the thixotropic property of the resin composition that forms the protrusions will be insufficient, making it difficult to form protrusions by thick embossing printing. may become

The organic particles are not particularly limited, and usually resin beads are used. Examples of resin beads include acrylic beads, urethane beads, nylon beads, and styrene beads. Among these, acrylic beads or urethane beads are preferably used, and acrylic beads are particularly preferably used, from the viewpoint of suppressing whitening of the protrusions, imparting an excellent touch feeling, and improving the scratch resistance of the protrusions. In addition, from the viewpoint of imparting an excellent tactile sensation and improving the scratch resistance of the protrusions, it is preferable to use crosslinked resin beads. As crosslinked resin beads,
Specific examples include crosslinked acrylic beads and crosslinked urethane beads.

The organic particles contained in the protrusions preferably have an average particle size of 15 to 50 μm.
More preferably, the average particle size of the organic particles is 20 to 35 μm. If the average particle size of the organic particles is less than 15 μm, it may not be possible to obtain excellent tactile sensation. In addition, if the average particle size of the organic particles exceeds 50 μm, the production stability may decrease, and it may become difficult to form convex portions having a desired shape with good reproducibility. In the present invention, since the organic resin is uniformly distributed, the height of the protrusions is close to the average particle size of the organic particles. Also, when the convex portions are formed by build-up printing, the average particle size of the organic particles is preferably 1/2 or less of the plate depth from the viewpoint of ink transfer stability. In addition, in the present invention, the average particle size is a value measured by a laser diffraction/scattering method.

In the decorative sheet of the present invention, the gloss (60° gloss value) between the second resin layer and the protrusions
is preferably 5 or less. By approximating the luster of the second resin layer and the protrusions, it is possible to make the protrusions inconspicuous, so that the touch feeling of the protrusions can be achieved without impairing the gloss matte expression by the first resin layer and the second resin layer. can be given.

A difference in glossiness (60° gloss value) between the second resin layer and the protrusions may exceed 5. second
By slightly shifting the gloss difference between the resin layer and the convex portion, it is possible to create a pseudo three-level gradation gloss mat expression.

The area provided with the protrusions is preferably 5 to 80%, more preferably 7 to 50%, of the area of the second resin layer. By providing the protrusions within the above range, it is possible to obtain a decorative sheet with a more excellent tactile feel. Here, when the cross section of the protrusion is trapezoidal (see FIG. 1), conical, or the like, and the area of the upper and lower surfaces of the protrusion is different, the area of the protrusion is
It means the area of the surface of the convex portion that is in contact with the second resin layer.

The convex portion is formed on the second resin layer, but at least a part of the convex portion may be formed on the second resin layer. The part may exist directly on the first resin layer. That is, part of the convex portion may be provided in a region where the second resin layer is not provided. Moreover, the convex portion may be provided in synchronization with the pattern of the second resin layer, or may be provided independently of the pattern of the second resin layer. From the viewpoint of further enhancing the three-dimensional effect by combining the visual sense of design and the tactile sensation, it is preferable that the protrusions are provided in synchronism with the pattern of the second resin layer.

In addition, when the decorative sheet of the present invention is used for injection molding or vacuum molding, from the viewpoint of suppressing the deformation of the convex portion to obtain a desired shape and improving the three-dimensional moldability, the ionization that constitutes the convex portion Polycarbonate (meth)acrylate is preferably used as the radiation-curable resin. The same polycarbonate (meth)acrylate as described in the section of the first resin layer can be used.

When the decorative sheet of the present invention is used for injection molding or vacuum molding, from the viewpoint of improving the scratch resistance of the decorative sheet and improving the three-dimensional moldability, the projections are made of an ionizing radiation curable resin and a thermoplastic resin. It is also preferable to constitute by a mixture with. The kind of the thermoplastic resin and the preferred mixing ratio of the ionizing radiation-curable resin and the thermoplastic resin are the same as those described in the section of the first resin layer.

If necessary, a colored masking layer may be formed on the colored masking layer base sheet. The colored masking layer is formed on the base sheet as a solid printed layer on the entire surface. The colored masking layer can be, for example, a layer containing a pigment and a binder resin. This colored masking layer can be formed by a known printing method such as gravure printing, flexographic printing, silk screen printing, offset printing, etc., using a printing ink containing a coloring agent, a binder resin and a solvent. Known or commercially available inks may be used for these inks.

As the colorant, binder resin and solvent, those used in the pattern layer can be used. Further, the thickness of the colored masking layer is preferably about 1 to 10 μm.

A primer layer may be optionally formed on the base sheet for the primer layer, the colored masking layer, the pattern layer, the first resin layer, or the second resin layer for the purpose of improving adhesion. good.

As the resin contained in the primer layer, for example, acrylic resin, vinyl chloride-vinyl acetate copolymer, polyester, polyurethane, chlorinated polypropylene, chlorinated polyethylene and the like can be used. In particular, acrylic resin, chlorinated polypropylene and the like are preferable.

Examples of acrylic resins include polymethyl (meth)acrylate, polyethyl (meth)acrylate, polypropyl (meth)acrylate, polybutyl (meth)acrylate, methyl (meth)acrylate-(meth)acryl Butyl acid copolymer, ethyl (meth)acrylate-
Homopolymers of (meth)acrylic acid esters such as butyl (meth)acrylate copolymer, ethylene-methyl (meth)acrylate copolymer, styrene-methyl (meth)acrylate copolymer, or the above (meth)acrylate An acrylic resin made of a copolymer containing an acrylic acid ester can be mentioned.

Polyurethane is a composition containing polyol (polyhydric alcohol) as a main ingredient and isocyanate as a cross-linking agent (curing agent).

A polyol has two or more hydroxyl groups in its molecule. Examples of polyols that can be used include polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, and polyether polyol.

As the isocyanate, a polyvalent isocyanate having two or more isocyanate groups in the molecule is used. Examples of isocyanates include aromatic isocyanates such as 2,4-tolylene diisocyanate, xylene diisocyanate and 4,4′-diphenylmethane diisocyanate; (or alicyclic) isocyanate and the like are used.

The thickness of the primer layer is not limited, and is preferably about 0.1 to 10 μm, and 0.1 to 5 μm.
About μm is more preferable.

Back surface primer layer A back surface primer layer may be provided on the back surface of the base sheet (the surface opposite to the surface on which the convex portions are formed), if necessary. The back primer layer is effective when laminating the decorative sheet of the present invention and an adherend to produce a decorative board.

The back primer layer can be formed by applying a known primer agent to the base sheet. Examples of primer agents include urethane resin-based primer agents made of acrylic-modified urethane resin (acrylic urethane resin), urethane-cellulose resin (
For example, a primer made of a resin obtained by adding hexamethylene diisocyanate to a mixture of urethane and nitrocellulose, a resin-based primer made of a block copolymer of acrylic and urethane, and the like can be used. Additives may be added to the primer agent, if necessary. Examples of additives include fillers such as calcium carbonate and clay, flame retardants such as magnesium hydroxide, antioxidants, lubricants, foaming agents, ultraviolet absorbers, and light stabilizers. The blending amount of the additive can be appropriately set according to the product characteristics.

The coating amount of the primer agent is not particularly limited, and is usually about 0.1 to 100 g/m ² , preferably about 0.1 to 50 g/m ² . In addition, the thickness of the back primer layer is not particularly limited,
It is usually about 0.01 to 10 μm, preferably about 0.1 to 1 μm.

2. Decorative plate A decorative plate can be obtained by adhering the decorative sheet to an adherend. The material to be adhered is not limited, and the same materials as those used for known decorative boards can be used.
Examples of the adherend include wood materials, metals, ceramics, plastics, and glass. In particular, the decorative sheet can be suitably used for wooden materials. Specific examples of wood materials include veneers, wood veneers, wood plywood, particle boards, and medium-density fiberboards (MDF) made from various materials such as cedar, cypress, zelkova, pine, lauan, teak, and melapie. , chipboards, or composite substrates in which chipboards are laminated. As the wooden material, it is preferable to use wood plywood, particle board, medium density fiberboard (MDF), or the like.

The method of attaching the decorative sheet to the adherend is not limited, and a method of laminating the decorative sheet on the adherend via an adhesive and then applying pressure is usually employed. The adhesive may be appropriately selected from known adhesives depending on the type of adherend. For example, polyvinyl acetate, polyvinyl chloride,
Vinyl chloride-vinyl acetate copolymers, ethylene-acrylic acid copolymers, ionomers, butadiene-acrylonitrile rubbers, neoprene rubbers, natural rubbers and the like can be mentioned. These adhesives can be used individually or in combination of 2 or more types.

Decorative boards manufactured in this manner are used, for example, as interior materials for buildings such as walls, ceilings and floors; exterior materials such as balconies and verandas; Weak electricity,
It can be used as a decorative surface board for cabinets of OA equipment and the like.

3. Decorative Resin Molded Product A decorative resin molded product can be obtained by integrating a molding resin with the decorative sheet of the present invention. That is, the decorative resin molded product of the present invention has a structure in which the decorative sheet of the present invention is laminated on the molded resin layer.

The decorative resin molded product of the present invention is produced using the decorative sheet of the present invention by various injection molding methods such as insert molding, simultaneous injection molding decoration, blow molding, and gas injection molding. . Among these injection molding methods, the insert molding method and the simultaneous injection molding decoration method are preferred. The decorative resin molded product of the present invention can also be produced by a decorating method such as vacuum pressure bonding, in which the decorative sheet of the present invention is attached onto a three-dimensional resin molded product (molded resin layer) prepared in advance. can be made.

In the decorative resin molded product of the present invention, the molded resin layer may be formed by selecting a resin according to the application. The molding resin forming the molding resin layer may be a thermoplastic resin or a thermosetting resin. Examples of thermoplastic resins include polyolefin resins such as polyethylene and polypropylene, ABS resins, styrene resins, polycarbonate (PC) resins, acrylic resins, and vinyl chloride resins. These thermoplastic resins may be used singly or in combination of two or more. Further, examples of thermosetting resins include urethane resins and epoxy resins. These thermosetting resins may be used singly or in combination of two or more.

4. Method for producing a decorative sheet As a method for producing a decorative sheet, for example, a pattern layer, a first resin layer and a second resin layer are formed in this order on a base sheet, and a resin is contained on the second resin layer. A manufacturing method for forming a convex portion is mentioned.

For example, after applying a resin composition for forming a picture pattern layer on a base sheet by a known printing method such as gravure printing, flexographic printing, silk screen printing, offset printing, etc., to print a pattern, A resin composition for forming the first resin layer is applied by a known printing method such as gravure printing, flexographic printing, silk screen printing, offset printing to form the first resin layer, and (2) pattern printing is performed by a known printing method such as gravure printing or screen printing to form a second resin layer, and a convex portion is formed on the second resin layer. Examples of the method for forming the projections with a thermosetting resin include a method in which a thermosetting resin solution is applied by a coating method such as a roll coating method or a gravure coating method, followed by drying and curing. In addition, as a method of forming convex portions with an ionizing radiation-curable resin, for example, a method of applying a solution of an ionizing radiation-curable resin by a coating method such as a gravure coating method or a roll coating method and irradiating ionizing radiation can be used. .

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples. However, the present invention is not limited to the examples.

Example 1
As a base sheet, colored thin paper base paper for building materials (U-FLEX manufactured by Oji F-Tex Co., Ltd.
30) is prepared, and a colored layer having a thickness of 7 μm is coated on one side by gravure printing using an ink in which a coloring agent is mixed with an acrylic resin. A 4 μm-thick wood-grain picture pattern layer was applied by gravure printing using an ink containing a coloring agent. The wood grain pattern was formed so that the winter grain portion was dark.

Next, a two-liquid curing type acrylic urethane resin composition (Showa "TSU" manufactured by Ink Kogyo Co., Ltd.) was used to perform gravure printing on the entire surface of the picture pattern layer to form a first resin layer having a thickness of 5 μm. note that,
The gloss of the first resin layer was set to 1.0 (60° gloss).

Next, a two-liquid curing type acrylic urethane resin composition ( "FW-NT" manufactured by Showa Ink Kogyo Co., Ltd.) is used to form a second resin layer with a thickness of 5 μm by gravure printing in a pattern excluding the winter grain part of the wood grain pattern of the picture pattern layer so as to be in sync with the wood grain pattern. formed. The glossiness of the second resin layer was set to be +3.1 (60° glossiness) with respect to the glossiness value of the protrusions, which will be described later.

Next, 75% by mass of a two-component acrylic urethane resin mainly composed of acrylic polyol resin and hexamethylene diisocyanate as a curing agent, and 25% by mass of acrylic beads (average particle diameter 20 μm, particle size distribution 10 to 80 μm) as organic particles. Using ink containing % by mass,
A pattern plate having a plate depth of 90 μm was used to form a convex portion by coating by build-up printing. The raised pattern was formed so as to have an area ratio of 25% with respect to the pattern coated with the second resin layer.

Finally, curing was performed at 70°C for 24 hours to obtain a decorative sheet.

Examples 2 to 6 and Comparative Example 1
Example 2 to Example 2 in the same manner as in Example 1 except that the second resin layer and the convex portion were formed as follows
6 and Comparative Example 1 were obtained.

In the second resin layer, the amount of silica particles, which is a matting agent, is set to the concentration shown in Table 1 below, and the remaining amount is a two-component curing type acrylic resin containing acrylic polyol as the main component and hexamethylene diisocyanate as a curing agent. Using a urethane resin composition, a second resin layer having a thickness of 5 μm was formed by gravure printing in a pattern excluding the winter grain portion of the wood grain pattern of the picture pattern layer so as to be in harmony with the wood grain pattern. In the second resin layer, the amount of silica particles was adjusted so that the gloss value of the protrusions described later was about +5 or less.

For the projections, a two-component acrylic urethane resin containing acrylic polyol resin and hexamethylene diisocyanate as a curing agent is used as the main component, and an ink containing particles shown in Table 1 below is used, and a pattern plate with a plate depth of 90 μm is used. was applied by build-up printing using to form convex portions.
The raised pattern was formed so as to have an area ratio of 25% with respect to the pattern coated with the second resin layer.

Comparative example 2
A decorative sheet of Comparative Example 2 was obtained in the same manner as in Example 1, except that no projections were formed.

The decorative sheets of Examples 1 to 6 and Comparative Examples 1 and 2 were evaluated as follows.

Height of Convex In order to confirm that the decorative sheet has a structure that provides excellent tactile sensation, the cross section of the decorative sheet was observed with a scanning electron microscope (SEM) to measure the vertical height of the convex. 10 points were measured and the average value was calculated. The standard vertical height of the protrusions that provide a tactile sensation is about 5 μm.

Particle Transition State The surface of the decorative sheet was observed with a scanning electron microscope (SEM), and the transition state of the particles contained in the projections was determined according to the following criteria.
○: A state in which particles are transferred independently one by one.
Δ: A state in which particles are concentrated and transferred.
x: Particles are aggregated.

Under the light source of a cloudy fluorescent lamp (manufactured by Panasonic Corporation, color rendering AA daylight color, D6500K), the raised urethane-coated portion was visually confirmed and evaluated according to the following criteria.
◎: No feeling of cloudiness ○: Slight feeling of cloudiness, but no discomfort with the overall design △: Feeling of cloudiness, slightly uncomfortable with the overall design ×: Strong feeling of cloudiness what you feel

Laminate in which a picture pattern layer and a first resin layer are formed in this order on a substrate sheet in the same manner as in Example 1, using inks separately for forming the glossy protrusions or the inks for forming the second resin layer. and the gloss value of each layer was measured using a portable gloss meter manufactured by Murakami Color Research Laboratory. In addition, the coating thickness was set in the same manner as the build-up layer and the second resin layer described above.

Under the light source of a design effect fluorescent lamp (manufactured by Panasonic Corporation, color rendering AA daylight color, D6500K), the entire sheet was visually observed and evaluated according to the following criteria.
◎: The gloss matte effect of the conduit portion is sufficiently confirmed, and there is no sense of discomfort in the build-up coating layer in the gloss portion. Little △: The gloss mat effect of the conduit part is confirmed, and the build-up coating layer in the gloss part feels a little strange ×: The gloss mat effect of the conduit part is weak, and the build-up coating layer in the gloss part is strong. Something that makes you feel uncomfortable

Example 7
On an ABS resin film (thickness: 400 μmm) as a base layer, an ink containing a vinyl chloride-vinyl acetate-acrylic copolymer resin was used to form a wood grain pattern layer (thickness: 5 μm) by gravure printing. . The wood grain pattern was formed so that the winter grain portion was dark.

Next, a first resin layer (
3 μm thick) was formed on the entire surface. Next, on the first resin layer, using a resin composition described later,
A second resin layer (thickness: 3 μm) was formed in a pattern by gravure printing in a pattern excluding the winter grain portion of the wood grain pattern of the picture pattern layer so as to be in sync with the wood grain pattern. Next, a resin composition described later was applied on the second resin layer by build-up printing using a pattern plate having a plate depth of 90 μm to form protrusions.

Finally, an electron beam is irradiated from the convex side (acceleration voltage 165 kV, irradiation dose 50 kGy (5 Mr.
ad)) to cure the first resin layer, the second resin layer and the projections to obtain a decorative sheet.

(Resin composition forming the first resin layer)
・Bifunctional polycarbonate urethane acrylate (weight average molecular weight 10,000) 73
mass%
・ Tetrafunctional urethane acrylate (weight average molecular weight 6,000) 4% by mass
・ Silica particles (average particle size 1.3 μm) 23% by mass

(Resin composition forming the second resin layer)
・Bifunctional polycarbonate urethane acrylate (weight average molecular weight 10,000) 86
mass%
・ Tetrafunctional urethane acrylate (weight average molecular weight 6,000) 5% by mass
・Urethane beads (average particle size 3 μm) 9% by mass

(Resin composition for forming projections)
・Bifunctional polycarbonate urethane acrylate (weight average molecular weight 10,000) 76
mass%
・ Tetrafunctional urethane acrylate (weight average molecular weight 6,000) 4% by mass
・Urethane beads (average particle size 25 μm, particle size distribution 10 to 100 μm) 20% by mass

Examples 8-10
A decorative sheet was obtained in the same manner as in Example 7, except that the type, average particle size, particle size distribution, and particle concentration of the particles contained in the resin composition forming the protrusions were changed as shown in Table 2.

The decorative sheets of Examples 7 to 10 and the decorative resin moldings produced as follows were evaluated as follows.

Manufacture of Decorative Resin Molded Product A decorative sheet was heated to 180° C. and vacuum-molded (pre-molded) using a vacuum mold to obtain a molded sheet. The obtained molded sheet is inserted into an injection mold, the injection mold is clamped, the ABS resin in a fluid state is injected into the mold from the substrate layer side, and the surface is decorated by cooling and solidifying as it is. A decorative resin molded article in which the sheet was integrated was obtained.

surface roughness
It was measured using a contact surface roughness meter (Handysurf E-35A manufactured by Tokyo Seimitsu Co., Ltd.). In addition, the standard of the ten-point average roughness that provides a tactile sensation is about 5 μm.

The state of particle transition and the feeling of cloudiness of each decorative sheet were evaluated in the same manner as in Examples 1-6 and Comparative Examples 1-2.

Design Effect Each decorative resin molded article was evaluated in the same manner as in Examples 1-6 and Comparative Examples 1-2.

1. Cosmetic sheet2. base sheet3. pattern layer4. first resin layer 5 . 2nd resin layer 6 . Convex part

Claims (10)

A first resin layer containing a matting agent, a second resin layer partially provided on the first resin layer, and a resin and organic particles provided on the second resin layer on the base sheet. Having a convex portion including in this order,
Having a picture pattern layer between the base sheet and the first resin layer,
The picture pattern layer is a wood grain pattern having a winter grain pattern,
A decorative sheet, wherein the second resin layer having a gloss higher than that of the first resin layer is provided on a portion of the wood grain pattern other than the winter grain pattern. A first resin layer containing a matting agent, a second resin layer partially provided on the first resin layer, and a resin and organic particles provided on the second resin layer on the base sheet. Having a convex portion including in this order,
Having a picture pattern layer between the base sheet and the first resin layer,
The picture pattern layer is a wood grain pattern having a vessel pattern,
A decorative sheet, wherein the second resin layer having a gloss higher than that of the first resin layer is provided on a portion of the wood grain pattern other than the vessel pattern. The decorative sheet according to claim 1 or 2, wherein the content of the organic particles is 50% by mass or less of the solid content of the resin composition forming the protrusions. The decorative sheet according to any one of claims 1 to 3, wherein the content of the organic particles is 2 mass% or more of the solid content of the resin composition forming the protrusions. The decorative sheet according to any one of claims 1 to 4, wherein the organic particles have an average particle size of 15 to 50 µm. The decorative sheet according to any one of claims 1 to 5, wherein the area provided with the protrusions is 5 to 80% of the area of the second resin layer. The decorative sheet according to any one of claims 1 to 6, wherein the second resin layer contains a matting agent. The mass of the matting agent contained per unit mass of the solid content of the resin composition forming the second resin layer is the matting content per unit mass of the solid content of the resin composition forming the first resin layer 8. The decorative sheet according to claim 7, having a mass smaller than that of the erasing agent. A decorative board having the decorative sheet according to any one of claims 1 to 8 on an adherend. A decorative resin molded article having the decorative sheet according to any one of claims 1 to 8 on a molded resin layer.

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