JP7095526B2 - Decorative sheet and decorative board - Google Patents

Description

The present invention relates to a decorative sheet and a decorative board.

Conventionally, various decorative sheets have been used for surface makeup and the like in fittings, floors, walls and the like used for interior materials of buildings. For example, a decorative sheet composed of a base sheet and a laminate having a surface protective layer is widely used in order of thickness, and a decorative layer (pattern layer) is used on the base sheet as needed. And / or a transparent resin layer is provided, a primer layer is provided between the transparent resin layer and the surface protective layer to improve adhesiveness, and the resin of the surface protective layer is provided to improve the scratch resistance of the surface protective layer. It is known that the component contains an ionizing radiation curable resin.

Specific examples of the decorative sheet include, for example, Patent Document 1 and Patent Document 2, and Patent Document 1 discloses a decorative sheet used for an inner layer of a building, surface makeup of fittings, vehicle interior, and the like. In the first embodiment, the base sheet 2, the colored layer 3, the wood grain pattern pattern layer 4, the adhesive layer 5, the transparent resin layer 6, and the primer layer 7 having a thickness of 2 μm are sequentially provided in the thickness direction. , A decorative sheet including a surface protective layer 8 having a thickness of 5 μm formed of an electron beam curable resin composition is described (Patent Document 1 [0037] paragraph and FIG. 1).

Further, as an embodiment in which the decorative sheet has a three-dimensional design, for example, a pattern layer is provided on the base material sheet, a resin layer containing a matting agent is provided on the entire surface thereof, and the decorative sheet is further synchronized with the pattern layer. As described above, a decorative sheet partially provided with a resin layer has been proposed (Patent Documents 3, 4, etc.).

In such a conventional decorative sheet having a three-dimensional design, a visual three-dimensional effect can be obtained by the contrast between the high-gloss (gloss) part and the low-gloss (matte) part, but the conventional high-gloss (gloss) part is obtained. The part) is expressed by a single coating film, and there is almost no change in gloss within the region of this single coating film. These resin layers that develop a contrast between the high gloss (gloss) portion and the low gloss (mat) portion by adjusting the amount of the matting agent are also referred to as a design forming layer.

On the other hand, with regard to wood grain patterns, there are various wood grain patterns in actual wood depending on the difference in growth rate due to seasonal factors. For example, it is roughly divided into a part called early material (so-called Natsume) and a part called late material (so-called winter eye). Conventionally, in order to express these by printing, the late material part is expressed with low gloss (matte). , It is common to express the early wood part with high gloss. However, the growth rate of the wood is not constant even in the early lumber pattern, and when observing the processed wood, there are many cases where the early lumber portion also contains a complicated difference in gloss.

For example, FIG. 5 shows an example of a wood grain pattern (i) and a grain (ii) conduit pattern, but the late lumber (low gloss: dark part) and the early lumber (high gloss: light color part). ) And the boundary of these parts where the contrast is large (the transition from the late lumber to the early lumber) and the boundary with the low contrast (the transition from the early lumber to the late lumber). ) And the existence, and it is shown that the difference in gloss may be included even in the early lumber part.

As another prior document related to the present invention, for example, Patent Document 5 exists.

Japanese Unexamined Patent Publication No. 2006-7728 Japanese Patent No. 5573986 Japanese Unexamined Patent Publication No. 9-174795 Japanese Unexamined Patent Publication No. 2013-123863 JP-A-2017-65261

With conventional decorative sheets, a visual three-dimensional effect can be obtained by the contrast between the high gloss (gloss) part and the low gloss (matte) part, but it is difficult to further express the difference in gloss in the high gloss (gloss) part. It is said that.

The present invention is a decorative sheet that gives a visual three-dimensional effect by the contrast between a high gloss (gloss) portion and a low gloss (matte) portion, and further expresses a difference in gloss in the high gloss (gloss) portion. It is an object of the present invention to provide a decorative sheet capable of being used, and a decorative board using the same.

As a result of repeated diligent research, the present inventor is a decorative sheet composed of a laminate having at least a base sheet, a pattern layer, and a design forming layer in order in the thickness direction, and the design forming. It has been found that the above object can be achieved when the layer has two specific layers, and the present invention has been completed.

That is, the present invention relates to the following decorative sheet and decorative board.
1. 1. A decorative sheet composed of a laminate having at least a base sheet, a pattern layer, and a design forming layer in order in the thickness direction.
(1) The design forming layer has two layers, a first design forming layer and a second design forming layer, in order from the base sheet side.
(2) The pattern pattern layer is a layer for drawing a pattern in which dark-colored portions and light-colored portions are alternately arranged, and the boundary between the dark-colored portion and the light-colored portion has a large contrast of light and shade. Boundaries B with small contrast between A and shading exist alternately,
(3) The first design forming layer is partially formed in the region of the light-colored portion of the pattern layer so as to be synchronized with the boundary A having a large contrast of light and shade, and the second design forming layer is formed. Is formed so as to cover the pattern layer and the first design forming layer.
(4) When the decorative sheet is viewed in a plan view from the design forming layer side, the degree of gloss of the portion where the first design forming layer and the second design forming layer overlap is set to Gr1, and the first design forming layer is set. Gr2 <Gr1 when the degree of gloss of the portion where the second design forming layer is present is Gr2.
A decorative sheet featuring that.
2. 2. Item 2. The above item 1, wherein the design forming layer further has a third design forming layer, and the third design forming layer is formed on the entire surface between the pattern pattern layer and the first design forming layer. Cosmetic sheet.
3. 3. Item 2. The decorative sheet according to Item 2, wherein at least one of the first design forming layer, the second design forming layer, and the third design forming layer contains an ionizing radiation curable resin.
4. Item 2. The decorative sheet according to any one of Items 1 to 3, wherein the second design forming layer contains resin beads.
5. Item 2. The decorative sheet according to any one of Items 1 to 4, wherein a transparent resin layer is provided between the pattern layer and the design forming layer.
6. Item 2. The decorative sheet according to any one of Items 1 to 5, wherein the embossed uneven pattern is formed from the side of the second design forming layer.
7. The pattern of the pattern layer is a wood grain pattern, the dark part depicts the late wood (winter eyes), the light color portion depicts the early wood (Natsume), and the boundary A having a large contrast between the shades is Item 2. The decorative sheet according to any one of Items 1 to 6, which is a transition portion from the late material to the early material.
8. A decorative board composed of a laminated body including a decorative board base material and the decorative sheet according to any one of Items 1 to 7 above, in order in the thickness direction.

The decorative sheet of the present invention is a decorative sheet composed of a laminated body including at least a base sheet, a pattern layer, and a design forming layer in order in the thickness direction.
(1) The design forming layer has two layers, a first design forming layer and a second design forming layer, in order from the base sheet side.
(2) The pattern pattern layer is a layer for drawing a pattern in which dark-colored portions and light-colored portions are alternately arranged, and the boundary between the dark-colored portion and the light-colored portion has a large contrast of light and shade. Boundaries B with small contrast between A and shading exist alternately,
(3) The first design forming layer is partially formed in the region of the light-colored portion of the pattern layer so as to be synchronized with the boundary A having a large contrast of light and shade, and the second design forming layer is formed. Is formed so as to cover the pattern layer and the first design forming layer.
(4) When the decorative sheet is viewed in a plan view from the design forming layer side, the degree of gloss of the portion where the first design forming layer and the second design forming layer overlap is set to Gr1, and the first design forming layer is set. Gr2 <Gr1 when the degree of gloss of the portion where the second design forming layer is present is Gr2.
It is characterized by that.

Such a feature is achieved, for example, by forming the second design cambium as a high gloss portion and partially forming the first design cambium having a higher degree of gloss (higher gloss). It is possible to further express the difference in gloss in the high gloss portion when the decorative sheet is viewed from the design forming layer side in a plan view. Further, in the present invention, the first design forming layer is partially formed in the region of the light-colored portion so as to be synchronized with the boundary A in which the contrast between the dark-colored portion and the light-colored portion of the pattern is large. In addition to the above effects, an effect of making the boundary A having a large contrast more conspicuous can also be obtained.

It is sectional drawing which shows typically the example of the decorative sheet of this invention. It is sectional drawing which shows typically the example of the decorative sheet of this invention. It is sectional drawing which shows typically the example of the decorative sheet of this invention. It is sectional drawing which shows typically the example of the constituent member of the decorative material of this invention. When lumber is sawn, various wood grain patterns can be obtained due to the difference in the sawing method, and in the example of the conduit pattern of the wood grain pattern (i) and the grain (ii), the late wood (low gloss: dark color). When observing the boundary between these parts where the part) and the early wood (high lumber: light-colored part) are arranged alternately, the contrast between the light and shade is large and the contrast between the light and shade is small. It is a schematic diagram showing that there is a boundary (transition portion from early lumber to late lumber) and a difference in gloss is included even in the early lumber portion. In the figure, the arrow portion indicates the formation position of the first design forming layer in relation to the wood grain pattern.

1. 1. Decorative sheet The decorative sheet of the present invention is a decorative sheet composed of a laminated body including at least a base sheet, a pattern layer, and a design forming layer in order in the thickness direction.
(1) The design forming layer has two layers, a first design forming layer and a second design forming layer, in order from the base sheet side.
(2) The pattern pattern layer is a layer for drawing a pattern in which dark-colored portions and light-colored portions are alternately arranged, and the boundary between the dark-colored portion and the light-colored portion has a large contrast of light and shade. Boundaries B with small contrast between A and shading exist alternately,
(3) The first design forming layer is partially formed in the region of the light-colored portion of the pattern layer so as to be synchronized with the boundary A having a large contrast of light and shade, and the second design forming layer is formed. Is formed so as to cover the pattern layer and the first design forming layer.
(4) When the decorative sheet is viewed in a plan view from the design forming layer side, the degree of gloss of the portion where the first design forming layer and the second design forming layer overlap is set to Gr1, and the first design forming layer is set. Gr2 <Gr1 when the degree of gloss of the portion where the second design forming layer is present is Gr2.
It is characterized by that.

Such a feature is achieved, for example, by forming the second design cambium as a high gloss portion and partially forming the first design cambium having a higher degree of gloss (higher gloss). It is possible to further express the difference in gloss in the high gloss portion when the decorative sheet is viewed from the design forming layer side in a plan view. Further, in the present invention, the first design forming layer is partially formed in the region of the light-colored portion so as to be synchronized with the boundary A in which the contrast between the dark-colored portion and the light-colored portion of the pattern is large. In addition to the above effects, an effect of making the boundary A having a large contrast more conspicuous can also be obtained.

In the conventional decorative sheet, the contrast between the high-gloss part and the low-gloss part gives a visual three-dimensional effect, but the high-gloss part is expressed by a single coating film. Although there is almost no change in gloss within the region of this single coating film, the decorative sheet of the present invention can sufficiently express the difference in gloss in the high gloss portion. , It is possible to give a more visual three-dimensional effect than the conventional product.

Therefore, for example, when the pattern is a wood grain pattern, it is possible to express a design that is closer to the actual wood grain pattern. It is possible to depict not only the difference in contrast due to the difference in the growth rate of trees even during early lumber, but also the difference in contrast with different degrees of luster.

The decorative sheet of the present invention may be composed of a laminated body including a base sheet, a pattern layer, and a design forming layer having a predetermined two-layer structure in order in the thickness direction, and the specific structure thereof (s). The layer structure) is not limited.

In a specific embodiment, for example, a decorative sheet (aspect in FIG. 1) in which a pattern layer and a design forming layer having a predetermined two-layer structure are sequentially laminated on a base material sheet, and a design forming layer is a third. A decorative sheet having a design forming layer (aspect of FIG. 2) and the like can be mentioned. Further, a transparent adhesive layer, a transparent resin layer, and a primer layer may be arbitrarily formed between the pattern layer and the design forming layer (the aspect of FIG. 3). If necessary, a back surface primer layer may be provided on the back surface of the decorative sheet as shown in FIGS. 1 to 3 in order to enhance the adhesiveness to the decorative board base material.

In the present specification, the direction in which the design cambium is laminated when viewed from the base sheet is referred to as "upper" or "front surface", and the direction in which the back surface primer layer is laminated when viewed from the base sheet is referred to as "upper" or "front surface". Referred to as "bottom" or "back side". The "front (side) surface" or "design forming layer (side) surface" of the decorative sheet or decorative board means a surface that can be visually recognized after the decorative sheet or decorative board is installed. In the following, the term "design forming layer side" is also abbreviated as "design forming layer side".

Hereinafter, the decorative sheet will be described with reference to the drawings.

1 to 3 are sectional views showing an example of the decorative sheet of the present invention, respectively. In the decorative sheet 1 shown in FIG. 1, the pattern layer 3 and the design forming layers 8 and 9 (collectively, the design forming layer a) are laminated on the base material sheet 2. In the decorative sheet 1 shown in FIG. 2, the pattern layer 3 and the design forming layers 7 to 9 (collectively, the design forming layer a) are laminated on the base material sheet 2. Further, the decorative sheet 1 shown in FIG. 3 has a pattern layer 3, a transparent adhesive layer 4, a transparent resin layer 5, a primer layer 6 and a design forming layer 7 to 9 (collectively designed) on the base sheet 2. Layers a) are laminated. In FIGS. 1 to 3, the back surface primer layer 8 is laminated on the back surface of the base material sheet 2.

The design forming layers 7 to 9 (design forming layer a) are, in detail, a third design forming layer 7 formed on the entire surface (solid shape), a first design forming layer 8 formed on a part thereof, and preferably. Is the second design forming layer 9 formed on the entire surface, and the decorative sheet of the present invention is an essential layer among the design forming layers 7 to 9, the first design forming layer 8 and the second design forming layer 9. ..

As is clear from FIG. 1, in the decorative sheet of the present invention, the pattern pattern layer is a layer for drawing a pattern in which dark-colored portions b and light-colored portions c are alternately arranged, and the dark-colored portion b and the light-colored portion c are drawn. At the boundary with c, the boundary A having a large contrast of light and shade and the boundary B having a small contrast of light and shade are alternately present, and the first design forming layer d is in the region of the light color portion c (light color when viewed from above). It is partially formed in the region overlapping the portion c) so as to be synchronized with the boundary A having a large contrast of light and shade. That is, when viewed from above, the first design forming layer d is formed at the end of the light-colored portion c so as to be adjacent to the boundary A having a large contrast. In the present invention, the above-mentioned excellent effect can be obtained by providing such a configuration.

Hereinafter, each layer constituting the decorative sheet of the present invention will be specifically described. In the following description, the lower and upper limits of the numerical range represented by "-" mean "greater than or equal to or less than" (for example, if α to β, it is greater than or equal to α and less than or equal to β).

Base material sheet The base material sheet is sequentially laminated with a pattern layer, a design forming layer, and the like on the surface (front surface). The material of the base sheet is not limited, but if it is a resin-based material, it preferably contains a non-halogen-based thermoplastic resin. In addition, paper-based materials can also be used.

Examples of the non-halogen thermoplastic resin include low-density polyethylene (including linear low-density polyethylene), medium-density polyethylene, high-density polyethylene, ethylene-α-olefin copolymer, homopolypropylene, polymethylpentene, polybutene, and ethylene-. Olefin-based thermoplastic resins such as propylene copolymers, propylene-butene copolymers, ethylene-vinyl acetate copolymers, ethylene-vinyl acetate copolymer sakens, or mixtures thereof, polyethylene terephthalates, polybutylene terephthalates, Thermoplastic ester-based resins such as polyethylene naphthalate, polyethylene naphthalate-isophthalate copolymer, polycarbonate, polyarylate, methyl poly (meth) acrylate, ethyl poly (meth) acrylate, ethyl polyacrylate, polyacrylic acid Examples thereof include acrylic thermoplastic resins such as butyl, polyamide thermoplastic resins such as nylon-6 and nylon-66, and polyethylene, polyurethane, polystyrene, acrylonitrile-butadiene-styrene resin and the like. Further, these non-halogen thermoplastic resins may be used alone or in combination of two or more. Among them, the olefin-based thermoplastic resin is preferable in that it is excellent in printability and embossing suitability of the pattern layer and is inexpensive.

In the case of the above-mentioned paper quality, a known fibrous sheet (backing paper) or the like can be used.

Specifically, general paper (pulp-based sheet size-treated with a known sizing agent); flame-retardant paper (pulp-based sheet treated with a flame-retardant agent such as guanidine sulfamate or guadinin phosphate); Examples thereof include inorganic paper containing inorganic additives such as aluminum hydroxide and magnesium hydroxide; high-quality paper; thin paper; fiber-blended paper (made by mixing pulp and synthetic fiber). The fibrous sheet used in the present invention also includes those that are classified as non-woven fabrics. In addition, the paper-based base material is a combination of a fibrous sheet and different materials (for example, polyethylene-processed paper in which polyethylene is melt-coated on one or both sides of the paper, and moisture-proof paper in which metal foil such as aluminum foil is laminated. ) Etc. are also included.

The base sheet may be colored. In this case, a coloring material (pigment or dye) can be added to the resin-based or paper-based sheet as described above to color the sheet. As the coloring material, for example, inorganic pigments such as titanium dioxide, carbon black and iron oxide, organic pigments such as phthalocyanine blue, and various dyes can be used. These can be selected from one or more of known or commercially available ones. Further, the amount of the coloring material added may be appropriately set according to the desired color and the like.

The base sheet contains various additives such as fillers, matting agents, foaming agents, flame retardants, lubricants, antistatic agents, antioxidants, UV absorbers, light stabilizers, etc., as required. It may be.

The thickness of the base sheet is preferably 20 to 150 μm. If the thickness of the base material sheet is less than 20 μm, if the decorative plate base material has an uneven shape, the appearance of the unevenness on the surface of the decorative plate may not be sufficiently suppressed. Further, if the thickness of the base material sheet exceeds 150 μm, the decorative sheet may be rolled up when stored in a roll state, which may make roll laminating difficult. The thickness of the base sheet is more preferably 40 to 100 μm. The base sheet may be composed of either a single layer or a multilayer.

The surface (front surface) of the base sheet may be subjected to a corona discharge treatment in order to enhance the adhesion of the ink forming the pattern layer. The method and conditions of the corona discharge treatment may be carried out according to a known method. Further, if necessary, the back surface of the base sheet may be subjected to a corona discharge treatment, or a back surface primer layer described later may be formed.

Pattern pattern layer The pattern pattern layer is a layer that imparts a desired pattern (design) to a decorative sheet, and the type of pattern or the like is not limited. For example, a wood grain pattern, a leather pattern, a stone grain pattern, a sand grain pattern, a tiled pattern, a brickwork pattern, a cloth grain pattern, a geometric figure, an abstract pattern and the like can be mentioned.

The pattern layer of the decorative sheet of the present invention is a layer for drawing a pattern in which dark-colored portions and light-colored portions are alternately arranged, and the contrast between the dark-colored portions and the light-colored portions is the contrast between the dark-colored portions and the light-colored portions. Boundaries A with a large contrast and boundaries B with a small contrast exist alternately. For example, in FIG. 1, the pattern pattern layer is a layer in which dark-colored portions b and light-colored portions c are alternately arranged to depict a pattern, and the contrast between dark-colored portions b and light-colored portions c is contrasted. Boundaries A with a large contrast and boundaries B with a small contrast exist alternately. Such a pattern is likely to appear in the case of a wood grain pattern as shown in FIG. 5, for example. For example, in FIG. 5, in the example of the conduit pattern of the wood grain pattern (i) and the grain pattern (ii), the late lumber (low gloss: dark part) and the early lumber (high gloss: light color part) alternate. When observing the boundaries of these parts to be arranged, the boundary where the contrast of light and shade is large (transition part from late wood to early wood: boundary A) and the boundary where the contrast of light and shade is small (transition part from early wood to late wood: boundary) It was found that B) and were present, and there was a difference in gloss even in the early lumber part. However, the pattern of the decorative sheet of the present invention is not limited to the wood grain pattern, and similarly to the wood grain pattern, the alternating arrangement of the dark color portion b and the light color portion c and the boundary A in which the contrast of the light and shade is relatively different. It can be widely adopted as long as it is a pattern in which the boundary B and the boundary B occur alternately.

The method for forming the pattern layer is not particularly limited, and for example, an ink obtained by dissolving (or dispersing) a known colorant (dye or pigment) in a solvent (or dispersion medium) together with a binder resin is used. It may be formed on the surface of the base sheet by a printing method. As the ink, an aqueous composition can also be used from the viewpoint of reducing the VOC of the decorative sheet.

Examples of the colorant include inorganic pigments such as carbon black, titanium white, zinc flower, petal pattern, dark blue, and cadmium red; azo pigments, lake pigments, anthraquinone pigments, quinacridone pigments, phthalocyanine pigments, isoindolinone pigments, and dioxazine pigments. Organic pigments such as; metal powder pigments such as aluminum powder and bronze powder; pearl luster pigments such as titanium oxide-coated mica and bismuth oxide chloride; fluorescent pigments; luminous pigments and the like. These colorants can be used alone or in admixture 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.

As the binder resin, in addition to the hydrophilic treated polyester-based urethane resin, polyester, polyacrylate, polyvinyl acetate, polybutadiene, polyvinyl chloride, chlorinated polypropylene, polyethylene, polystyrene, polystyrene-acrylate copolymer, and rosin derivative. , Alcohol adduct of styrene-maleic anhydride copolymer, cellulose-based resin and the like can also be used in combination. More specifically, for example, polyacrylamide resin, poly (meth) acrylic acid resin, polyethylene oxide resin, poly N-vinylpyrrolidone resin, water-soluble polyester resin, water-soluble polyamide resin, water-soluble amino. Water-soluble resins, water-soluble phenolic resins, and other water-soluble synthetic resins; water-soluble natural polymers such as polynucleotides, polypeptides, and polysaccharides; and the like can also be used. Further, for example, natural rubber, synthetic rubber, polyvinyl acetate resin, (meth) acrylic resin, polyvinyl chloride resin, polyurethane-polyacrylic resin and the like modified or a mixture of the natural rubber and the like, and others. Resin can also be used. The binder resin can be used alone or in combination of two or more.

Examples of the solvent (or dispersion medium) include petroleum-based organic solvents such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane, and methylcyclohexane; ethyl acetate, butyl acetate, -2-methoxyethyl acetate, and -2 acetate. -Ester-based organic solvents such as ethoxyethyl; alcohol-based organic solvents such as methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol and propylene glycol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone. Examples thereof include ether-based organic solvents such as diethyl ether, dioxane, and tetrahydrofuran; chlorine-based organic solvents such as dichloromethane, carbon tetrachloride, trichloroethylene and tetrachloroethylene; and inorganic solvents such as water. These solvents (or dispersion media) can be used alone or in admixture of two or more.

Examples of the printing method used for forming the pattern layer include a gravure printing method, an offset printing method, a screen printing method, a flexographic printing method, an electrostatic printing method, and an inkjet printing method. Further, when the patterned pattern layer of the present invention is formed after the solid colored layer is formed on the entire surface, for example, a roll coat method or a knife coat method is used as a method for forming the solid colored layer on the entire surface. , Air knife coating method, die coating method, lip coating method, comma coating method, kiss coating method, flow coating method, dip coating method and various other coating methods. In addition, the hand-painting method, suminagashi method, photographic method, transfer method, laser beam drawing method, electron beam drawing method, partial vapor deposition method for metals, etching method, etc. may be used, or may be used in combination with other forming methods. good.

The thickness of the pattern layer is not particularly limited and can be appropriately set according to the product characteristics, but the layer thickness is about 0.1 to 15 μm.

Transparent Adhesive Layer In order to improve the adhesion between the pattern layer and the transparent resin layer or design forming layer described later, a transparent adhesive layer may be formed on the pattern layer. The transparent adhesive layer is not particularly limited as long as it is transparent, and includes colorless transparent, colored transparent, translucent and the like.

The adhesive is not particularly limited, and an adhesive known in the field of decorative sheets can be used. Examples of the adhesive known in the field of decorative sheets include thermoplastic resins such as polyamide resins, acrylic resins and vinyl acetate resins, and thermosetting resins such as urethane resins. These adhesives can be used alone or in combination of two or more. Further, a two-component curable polyurethane resin or a polyester resin using isocyanate as a curing agent may also be applied.

The thickness of the transparent adhesive layer is not particularly limited, but the thickness is about 0.1 to 30 μm, preferably about 1 to 20 μm.

Transparent resin layer The transparent resin layer is a layer that can be arbitrarily provided, and is not particularly limited as long as it is transparent, and may be colorless transparent, colored transparent, translucent, or the like. The material of the transparent resin layer is not limited, but it is preferably a thermoplastic resin containing a non-halogen-based thermoplastic resin.

Examples of the non-halogen thermoplastic resin include low-density polyethylene (including linear low-density polyethylene), medium-density polyethylene, high-density polyethylene, ethylene-α-olefin copolymer, homopolypropylene, polymethylpentene, polybutene, and ethylene-. Olefin-based thermoplastic resins such as propylene copolymers, propylene-butene copolymers, ethylene-vinyl acetate copolymers, ethylene-vinyl acetate copolymer sakens, or mixtures thereof, polyethylene terephthalates, polybutylene terephthalates, Thermoplastic ester-based resins such as polyethylene naphthalate, polyethylene naphthalate-isophthalate copolymer, polycarbonate, polyallylate, and acrylics such as methyl polymethacrylate, ethyl polymethacrylate, ethyl polyacrylate, and butyl polyacrylate. Examples thereof include based thermoplastic resins, polyamide-based thermoplastic resins such as nylon-6 and nylon-66, and polyethylene, polyurethane, polystyrene, acrylonitrile-butadiene-styrene resin and the like. Further, these non-halogen thermoplastic resins may be used alone or in combination of two or more. Among them, an olefin-based thermoplastic resin is preferable because it has excellent embossing suitability and is inexpensive.

The transparent resin layer may be colored as long as it has transparency.

Further, the transparent resin layer contains various additives such as a flame retardant, a lubricant, an antistatic agent, an antioxidant, an ultraviolet absorber, and a light stabilizer as long as it has transparency. May be.

The thickness of the transparent resin layer is not limited, but is preferably 40 μm or more and 300 μm or less, more preferably 80 μm or more and 200 μm or less, and most preferably 80 μm or more and 120 μm or less. By setting the thickness of the transparent resin layer within the above range, deep embossing can be formed, and the effect of suppressing scratches and scraping (pattern removal) due to wear of the pattern layer can be easily obtained. ..

Primer layer A primer layer for the design forming layer may be provided on the transparent resin layer. In addition to the action of enhancing the adhesion between the transparent resin layer and the design forming layer described later, this primer layer can enhance the bending workability and scratch resistance of the decorative sheet by combining with the design forming layer.

The primer layer can be formed by applying a known primer agent to the surface of the transparent resin layer. Examples of the primer agent include an acrylic-modified urethane resin (acrylic urethane-based copolymer resin), a urethane resin-based primer made of a polycarbonate-based acrylic urethane copolymer resin, and a urethane-cellulose resin (for example, urethane and nitrified cotton). Examples thereof include a primer agent made of a resin obtained by adding hexamethylene diisocyanate to the mixture of the above, a resin-based primer made of a block copolymer of acrylic and urethane, and the like. Among these, a urethane resin-based primer agent containing a polycarbonate-based acrylic urethane copolymer resin can be preferably used from the viewpoint of scratch resistance and weather resistance.

Additives may be added to the primer, if necessary. Examples of the additive include weathering agents such as ultraviolet absorbers and light stabilizers; fillers such as silica, calcium carbonate and clay; flame retardants such as magnesium hydroxide; antioxidants; lubricants; foaming agents and the like. The blending amount of the additive can be appropriately set according to the product characteristics.

Among the above additives, examples of the ultraviolet absorber include a benzophenone-based ultraviolet absorber, a benzotriazole-based ultraviolet absorber, a triazine-based ultraviolet absorber, and the like. As the light stabilizer, for example, a hindered amine-based light stabilizer (HALS) is suitable. The content of these weather resistant agents is not limited, but may be about 1000 to 100,000 wt ppm for each of the ultraviolet absorber and the light stabilizer. In particular, in the present invention, it is preferable to use a triazine-based ultraviolet absorber and / or a hindered amine-based light stabilizer.

The thickness of the primer layer is not limited, but is preferably 1 to 12 μm, more preferably 2 to 8 μm. By setting it within such a range, it becomes easy to improve the bendability and scratch resistance of the decorative sheet by combining it with the design forming layer described later. In addition, it becomes easy to contain an additive such as a weather resistant agent, and it becomes easy to impart weather resistance to the decorative sheet.

Design forming layer The decorative sheet of the present invention is composed of a laminated body including at least a base sheet, a pattern pattern layer, and a design forming layer (first design forming layer and second design forming layer) in order in the thickness direction. The base sheet and the design forming layer may be appropriately provided with at least one layer selected from the above-mentioned transparent adhesive layer, transparent resin layer and primer layer for the design forming layer.

The design forming layer has two layers, a first design forming layer and a second design forming layer, as essential layers in order from the base sheet side, and further, any arbitrary design forming layer is provided between the pattern pattern layer and the first design forming layer. A third design forming layer may be provided as the layer.

As is clear from FIG. 1, in the decorative sheet of the present invention, the pattern pattern layer is a layer for drawing a pattern in which dark-colored portions b and light-colored portions c are alternately arranged, and the dark-colored portion b and the light-colored portion c are drawn. At the boundary with c, the boundary A having a large contrast of light and shade and the boundary B having a small contrast of light and shade are alternately present, and the first design forming layer d is in the region of the light color portion c (light color when viewed from above). It is partially formed in the region overlapping the portion c) so as to be synchronized with the boundary A having a large contrast of light and shade. That is, when viewed from above, the first design forming layer d is formed at the end of the light-colored portion c so as to be adjacent to the boundary A having a large contrast. Further, the second design forming layer may be formed so as to cover the pattern pattern layer and the first design forming layer, and may not necessarily be formed on the entire surface (solid shape), but is formed on the entire surface. Is preferable.

In the embodiment of FIG. 1, for example, the second design forming layer is a high gloss portion, and the first design forming layer having a higher degree of gloss (higher gloss) is partially formed. When the decorative sheet is viewed from the design forming layer side in a plan view, the difference in gloss can be further expressed in the high gloss portion. Further, in the present invention, the first design forming layer is partially formed in the region of the light-colored portion so as to be synchronized with the boundary A in which the contrast between the dark-colored portion and the light-colored portion of the pattern is large. In addition to the above effects, an effect of making the boundary A having a large contrast more conspicuous can also be obtained.

When the third design forming layer is provided between the pattern layer and the first design forming layer, for example, the third design forming layer 7 is set as a low gloss (matte) portion, and the second design forming layer 9 is set as high. A glossy portion is formed, and a first design forming layer 8 having a higher degree of gloss (higher gloss) than the second design forming layer 9 is partially formed between them, whereby a high glossy portion is formed. The difference in gloss can be further expressed in 9. That is, it is preferable that the degree of gloss of the third design forming layer <the degree of gloss of the second design forming layer <the degree of gloss of the first design forming layer. It is assumed that the pattern pattern layer and the first design forming layer are covered with the second design forming layer, but when viewed from above, the edges of the pattern pattern layer and the first design forming layer and the second. When the end portion of the design forming layer is substantially the same, the end portion of the pattern pattern layer and the first design forming layer cannot be completely covered by the second design forming layer, and the pattern pattern layer and the first design are inevitably covered. An aspect in which a part of the cambium is slightly visible is acceptable.

The resin component contained in the design forming layers 7 to 9 (design forming layer a) is not limited, but preferably contains an ionizing radiation curable resin or a two-component curable urethane resin. Substantially, those formed from these resins are preferable. When the design forming layer is formed of an ionizing radiation curable resin or a two-component curable urethane resin, it is easy to improve the wear resistance, impact resistance, stain resistance, scratch resistance, weather resistance, etc. of the decorative sheet. Among these, the ionizing radiation curable resin is more preferable, and in the present invention, at least one of the first design forming layer, the second design forming layer and the third design forming layer preferably contains the ionizing radiation curable resin.

The ionizing radiation curable resin is not particularly limited, and a prepolymer (including an oligomer) and / or a monomer containing a radically polymerizable double bond in the molecule capable of polymerizing and cross-linking by irradiation with ionizing radiation such as ultraviolet rays and electron beams. A transparent resin containing the above as a main component can be used. These prepolymers or monomers may be used alone or in admixture. The curing reaction is usually a cross-linking curing reaction.

Specifically, the prepolymer or monomer is a compound having a radically polymerizable unsaturated group such as a (meth) acryloyl group, a (meth) acryloyloxy group, a cationically polymerizable functional group such as an epoxy group, or the like in the molecule. Can be mentioned. Further, a polyene / thiol-based prepolymer obtained by combining a polyene and a polythiol is also preferable. Here, the (meth) acryloyl group means an acryloyl group or a methacryloyl group.

Examples of the prepolymer having a radically polymerizable unsaturated group include polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, triazine (meth) acrylate, and silicone (meth) acrylate. And so on. The molecular weight of these is usually preferably about 250 to 100,000.

Examples of the monomer having a radically polymerizable unsaturated group include methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and phenoxyethyl (meth) acrylate as monofunctional monomers. Examples of the polyfunctional monomer include diethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane ethylene oxide tri (meth) acrylate, and dipentaerythritol tetra (). Examples thereof include meth) acrylate, dipentaerythritol penta (meth) acrylate, and dipentaerythritol hexa (meth) acrylate.

Examples of the prepolymer having a cationically polymerizable functional group include prepolymers of epoxy resins such as bisphenol type epoxy resins and novolak type epoxy compounds, and vinyl ether resins such as fatty acid vinyl ethers and aromatic vinyl ethers. Examples of the thiol include polythiols such as trimethylolpropane trithioglycolate and pentaerythritol tetrathioglycolate. Examples of the polyene include those in which allyl alcohol is added to both ends of a polyurethane made of diol and diisocyanate.

As the ionizing radiation used for curing the ionizing radiation curable resin, electromagnetic waves or charged particles having energy capable of curing the molecules in the ionizing radiation curable resin (composition) are used. Normally, ultraviolet rays or electron beams may be used, but visible rays, X-rays, ion beams and the like may be used.

The two-component curable urethane resin is not particularly limited, but among them, a polyol component having an OH group (acrylic polyol, polyester polyol, polyether polyol, epoxy polyol, etc.) as a main component and an isocyanate component (trilens) as a curing agent component. Those containing isocyanate, hexamethylene diisocyanate, methylenedi isocyanate, etc.) can be used.

The above-exemplified resins can be used alone or in combination of two or more.

As described above, in the decorative sheet of the present invention, when the design forming layer is composed of the design forming layer 1 and the design forming layer 2, the first design is in a state where the decorative sheet is viewed from the design forming layer side in a plan view. When the degree of gloss of the portion where the molded layer and the second design forming layer overlap is Gr1, and the degree of gloss of the portion where the first design forming layer does not exist and the second design forming layer exists is Gr2. <Gr1, which can be achieved, for example, by setting the degree of gloss of the second design forming layer <the degree of gloss of the first design forming layer. When the third design forming layer is further provided, it is preferable that the degree of gloss of the third design forming layer <the degree of gloss of the second design forming layer <the degree of gloss of the first design forming layer.

As a means for providing a difference in the degree of gloss in each design forming layer, it is possible to provide a difference in the content of the matte material (filler such as silica) in each design forming layer. That is, when the content of the matte material is high, the portion becomes a low gloss (matte) portion, and when the content of the matte material is low, the portion becomes a high gloss (gloss) portion. Then, the high gloss portion, the intermediate gloss portion and the like can be expressed by further adjusting the content of the matte material in the high gloss portion.

In order to specify the degree of gloss of each design forming layer, for example, the cross section of each design forming layer is observed with an electron microscope, the amount of matting material (filler) present per unit area is measured, and the amount is measured. It can be investigated by relatively specifying the relationship with the reference layer (the layer in which the relationship between the content of the matte material and the glossiness is clear). For example, a decorative sheet is cut in a direction perpendicular to the surface, and the obtained cross section is photographed using a transmission electron microscope (TEM) or a scanning transmission electron microscope (SEM) to obtain a resin component constituting a layer having a width of 1 mm. It can be calculated by measuring the ratio of the cross section to the filler component. When the film thickness to be measured is on the order of μm, it is preferable to use SEM, and when the film thickness is on the order of nm, it is preferable to use TEM. In the case of SEM, the acceleration voltage is preferably 1 to 10 kV and the magnification is preferably 1000 to 7000 times, and in the case of TEM, the acceleration voltage is preferably 10 to 30 kV and the magnification is preferably 50,000 to 300,000 times.

In the present invention, the degree of gloss of the first design forming layer is 30 or more and 90 or less (particularly 35 or more and 80 or less, and further 41 or more and 60 or less) by a 75 ° gloss meter, and the degree of gloss of the second design forming layer is. The glossiness by the 75 ° gloss meter is 5 or more and 50 or less (especially 7 or more and 40 or less), and the difference in glossiness between the first design forming layer and the second design forming layer by the 75 ° gloss meter is 3 or more (especially gloss). The difference in degree is preferably 5 or more). The glossiness of the third design forming layer is about 1 to 5 by a 75 ° gloss meter.

In the decorative sheet of the present invention, the pattern of the pattern layer is a wood grain pattern, the dark part depicts the late lumber (winter eyes), and the light color portion depicts the early lumber (Natsume), and the contrast between the shades is large. It can be suitably applied to the embodiment in which the boundary A is the transition portion from the late lumber to the early lumber. For example, in FIG. 5, in the example of the conduit pattern of the wood grain pattern (i) and the grain pattern (ii), the late lumber (low gloss: dark part) and the early lumber (high gloss: light color part) alternate. When observing the boundaries of these parts to be arranged, the boundary where the contrast of light and shade is large (transition part from late wood to early wood: boundary A) and the boundary where the contrast of light and shade is small (transition part from early wood to late wood: boundary) It was found that B) and were present, and there was a difference in gloss even in the early lumber part. In the decorative sheet of the present invention, the first design forming layer is formed at the boundary A at the end of the light-colored portion, which is indicated by the arrow in FIG. 5, in relation to the pattern illustrated in FIG. Therefore, the difference in gloss can be further expressed in the second design forming layer (high gloss portion). Further, since the first design forming layer is partially formed in the region of the light-colored portion so as to be synchronized with the boundary A in which the contrast between the dark-colored portion and the light-colored portion of the pattern is large, the above effect is obtained. In addition, the effect of making the boundary A having a large contrast more conspicuous can be obtained.

The thickness of each design forming layer is not limited, but the thickness of the first design forming layer is preferably 1 to 15 μm, more preferably 1 to 7 μm. The thickness of the second design forming layer is preferably 1 to 15 μm, more preferably 1 to 7 μm. The thickness of the third design cambium is preferably 1 to 20 μm, more preferably 1 to 10 μm.

In order to improve the weather resistance, it is preferable to add an ultraviolet absorber such as benzotriazole-based, benzophenone-based, salicylate-based, or triazine-based to the design cambium.

In addition, when the resin layer is cured by irradiating with ultraviolet rays, acetophenones, benzophenones, Michler benzoylbenzoates, α-aminooxime esters, tetramethylthium monosulfide, thioxanthones, aromatics are used as photopolymerization initiators. Diazonium salt, aromatic sulfonium salt, metallocene and the like can be used, and n-butylamine, triethylamine, tri-n-butylphosphine and the like can be used as the photopolymerization accelerator (sensitizer).

Further, the second design forming layer, which is the outermost layer, may contain a resin bead for further improvement of the design property, and the decorative sheet is further imparted with a desired tactile sensation on the second design forming layer. It is also possible to provide a tactile sensation layer (so-called raised printing layer) for the purpose of doing so.

The design forming layer can be formed, for example, by applying an ionizing radiation curable resin or a two-component curable urethane resin on a primer layer by a known coating method such as a gravure coat or a roll coat, and then curing the resin.

The thickness of the entire design forming layer may be 3 μm or more, but it is preferably 3 μm or more and 25 μm or less, and more preferably 3 μm or more and 18 μm or less.

Embossing The embossing is performed to give a desired texture such as a wood grain pattern to the decorative sheet. For example, after heat is applied to the decorative sheet to soften it, an embossed plate having a desired uneven pattern is pressed mainly from the design forming layer side to form the uneven pattern, and the texture is cooled and fixed. Give. The embossing can be performed by a known single-wafer or rotary embossing machine.

Examples of the embossed uneven pattern include a wood grain conduit groove, a floating pattern (an uneven pattern of an embossed annual ring), a hairline, a sand grain, and a satin finish.

When embossed, if necessary, the embossed recess may be filled with ink by wiping. For example, the embossed recess is filled with ink while scratching the surface with a doctor blade. As the ink to be filled (wiping ink), an ink using a two-component curable urethane resin as a binder can be usually used. In particular, by performing wiping processing on the unevenness of the wood grain conduit groove, it is possible to enhance the commercial value by expressing a design closer to the actual wood grain.

Backside primer layer A backside primer layer may be provided on the back surface of the base sheet, if necessary. For example, it is effective when the base material sheet and the decorative board base material are adhered to form a decorative board.

The back surface primer layer can be formed by applying a known primer agent to the base material sheet. Examples of the primer agent include an acrylic-modified urethane resin (acrylic urethane-based copolymer resin), a urethane resin-based primer made of a polycarbonate-based acrylic urethane copolymer resin, and a urethane-cellulose resin (for example, urethane and nitrified cotton). Examples thereof include a primer agent made of a resin obtained by adding hexamethylene diisocyanate to the mixture of the above, a resin-based primer made of a block copolymer of acrylic and urethane, and the like.

Additives may be added to the primer, if necessary. Examples of the additive include a filler such as calcium carbonate and clay, a flame retardant such as magnesium hydroxide, an antioxidant, a lubricant, a foaming agent, an ultraviolet absorber, and a light stabilizer. The blending amount of the additive can be appropriately set according to the product characteristics.

The thickness of the back surface primer layer is not particularly limited, but is usually 0.01 to 10 μm, preferably about 0.1 to 1 μm.

Vesicles of various additives contained in each layer of the decorative sheet Various additives (inorganic fillers added to the primer layer and the design forming layer, etc.) added to the above-mentioned layers of the decorative sheet of the present invention are the various additives. Is preferably vesicled. The method for vesicle-forming various additives is not particularly limited, and vesicles can be formed by a known method, and the supercritical reverse-phase evaporation method is particularly preferable.

Hereinafter, the supercritical reverse phase evaporation method will be described in detail. The supercritical reverse phase evaporation method is water-soluble or hydrophilic in a mixture in which the substance forming the outer film of the vesicle is uniformly dissolved in carbon dioxide under supercritical state or temperature or pressure condition above the supercritical point. This is a method of adding an aqueous phase containing various additives as an encapsulating substance to form a capsule-shaped vesicle containing various additives as an encapsulating substance in a single layer of a film. The carbon dioxide in the supercritical state means carbon dioxide in a supercritical state having a critical temperature (30.98 ° C.) and a critical pressure (7.3773 ± 0.0030 MPa) or higher, and is a temperature above the critical point or higher. Carbon dioxide under pressure conditions means carbon dioxide under conditions where only the critical temperature or only the critical pressure exceeds the critical condition. By this method, a single-layer lamella vesicle having a diameter of 50 to 800 nm can be obtained. In general, vesicles are a general term for those containing a liquid phase inside vesicles having a closed membrane structure like a spherical shell, and in particular, those in which the outer membrane is composed of biolipids such as phospholipids are referred to as liposomes. ..

Examples of the phospholipids include phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, phosphatidic acid, phosphatidylglycerol, phosphatidylinositol, cardiolipin, yellow egg lecithin, hydrogenated yellow egg lecithin, soy lecithin, hydrogenated soybean lecithin and other glycerophospholipids, and sphingomyelin. , Sphingophospholipids such as ceramide phosphorylethanolamine and ceramidephosphorylglycerol.

As the substance constituting the outer membrane, a nonionic surfactant or a dispersant such as a mixture thereof with cholesterol or triacylglycerol can also be used.

Examples of the nonionic surfactant include polyglycerin ether, dialkyl glycerin, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, polyoxyethylene sorbitan fatty acid ester, sorbitan fatty acid ester, polyoxyethylene polyoxypropylene copolymer, and polybutadiene-. One or two kinds of polyoxyethylene copolymer, polybutadiene-poly2-vinylpyridine, polystyrene-polyacrylic acid copolymer, polyethylene oxide-polyethylethylene copolymer, polyoxyethylene-polycaprolactum copolymer, etc. The above can be used.

Examples of the cholesterol include one or more of cholesterol, α-cholestanol, β-cholestanol, cholestane, desmosterol (5,24-cholestadien-3β-ol), sodium cholic acid, choleciferol and the like. Can be used.

The outer membrane of the liposome may be formed from a mixture of a phospholipid and a dispersant. In the decorative sheet of the present invention, by forming the outer membrane into liposomes formed from phospholipids, the compatibility between the resin composition which is the main component of each layer and various additives can be improved.

2. 2. Decorative board The decorative board of the present invention is composed of a laminated body including the decorative board base material and the above-mentioned decorative sheet of the present invention in order in the thickness direction.

FIG. 2 shows an example of a decorative board 12 in which the decorative sheet 1 of the present invention (the surface opposite to the design forming layer side and the decorative board base material 11 are bonded together) is laminated on the decorative board base material 11 in this order. ..

The decorative board base material is not limited, but for example, medium-density wood fiber board, high-density wood fiber board, particle board, coniferous plywood, broad-leaved plywood, early-maturing plywood, cork sheet, cork-containing composite base material, thermoplastic. At least one kind of resin plate (polyvinyl chloride resin, polypropylene resin, polyethylene resin, acrylic resin, resin plate containing ABS resin or the like as a main component, or foamed thereof) and the like can be mentioned. These decorative board base materials may be used alone or by laminating two or more kinds in combination.

Here, examples of the coniferous tree include Abies sachalinensis, Larch, Spruce, Sugi, Hinoki, Pine, Sequoia, and Spruce. Examples of hardwoods include lauan, cinnamon, hippo, sen, beech, oak, and meranchi. Examples of early-maturing trees include poplar, falcata, acacia, chamelele, eucalyptus, and terminaria.

When wood plywood such as softwood plywood, hardwood plywood, and early-maturing plywood is used, the number of laminated wood veneers (number of plywood) is not limited, but usually 3 to 7 is preferable, and 5 to 7 is more preferable. Further, the adhesive used for producing wood plywood is not limited, and known woodworking adhesives can be widely used. Examples of the adhesive include acrylic, urethane, acrylic-urethane, polyvinyl acetate, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ionomer, butadiene-acrylic nitrile rubber, and neoprene rubber. , An adhesive containing natural rubber or the like as an active ingredient. Further, examples of the thermosetting adhesive include melamine-based, phenol-based, and urea-based (vinyl acetate-urea-based, etc.) adhesives.

As the cork sheet, not only so-called natural cork, which is a highly elastic material obtained by peeling and processing the cork tissue of the bark of cork oak, but also so-called synthetic cork made to resemble cork can be used. The cork sheet may be a single layer, or may be a laminated body of a plurality of cork sheets having different elastic moduli and densities.

Examples of the cork-containing composite base material include a composite material obtained by laminating and laminating a cork sheet and another material (for example, a medium-density wood fiber board or a high-density wood fiber board).

The thickness of the decorative board base material is not limited, but is preferably about 2 to 15 mm, more preferably about 2 to 12 mm.

The laminating method for laminating the decorative sheet and the decorative board base material is not limited, and for example, a method of adhering each of them with an adhesive or the like can be adopted. The adhesive may be appropriately selected from known adhesives according to the type of adherend and the like. For example, polyvinyl acetate, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ionomer and the like, as well as butadiene-acrylic nitrile rubber, neoprene rubber, natural rubber and the like can be mentioned. These adhesives may be used alone or in combination of two or more.

Hereinafter, the present invention will be specifically described with reference to Examples, Comparative Examples, and Test Examples. However, the present invention is not limited to the contents shown in the examples.

Example 1
A colored solid layer having a thickness of 5 μm was formed on a colored thin paper base paper for building materials (“U-FLEX30” manufactured by Oji F-Tex Co., Ltd.) by a gravure printing method, and then a pattern layer of a wood grain conduit having a thickness of 4 μm was applied. The wood grain conduit forms a pattern so that the late wood part has a dark color, and for the early wood part adjacent to the late wood part, the boundary A where the contrast of the light and dark pattern with the late wood part is large and the boundary B where the contrast is small. Was used as the existing pattern.

For the colored solid layer, a mixed resin (“HRA-NT” manufactured by DIC Graphics) in which a colorant was mixed with an acrylic resin was used. For the pattern layer, a mixed resin (“MAX-NT” manufactured by DIC Graphics) in which a colorant was mixed with an alkyd resin and a nitrocellulose resin was used.

Next, as the first design forming layer (high gloss layer), the following two-component urethane curable ink containing matte silica was applied to a thickness of 2 μm in a pattern (early material portion) excluding the above-mentioned late material portion of the wood grain pattern. It was formed so as to be in tune with the high-brightness portion (boundary A). The sheet gloss of the portion coated with the first design forming layer was set so that the gloss value of 75 ° was 58.
("FW-NT" manufactured by Showa Ink Industry Co., Ltd. A two-component curable ink with a resin consisting of 2 wt% matte silica with an average particle size of 2 microns and 98 wt% acrylic polyol as the main ingredient and hexamethylene diisocyanate as the curing agent)

Next, as the second design forming layer (medium gloss layer), the following two-component urethane curable ink containing matte silica was applied to the entire surface with a thickness of 2 μm so as to cover the above-mentioned pattern pattern layer and the first design forming layer. Formed (solid). The sheet gloss of the portion coated with the second design forming layer has a 75 ° gloss value of 40 for the second design forming layer alone, and 54 when the first design forming layer and the second design forming layer are laminated. It was set to be.
("FW-NT" manufactured by Showa Ink Industry Co., Ltd. A two-component curable ink with a resin consisting of 8 wt% matte silica with an average particle size of 2 microns and 92 wt% acrylic polyol as the main ingredient and hexamethylene diisocyanate as the curing agent)

Finally, it was heated and cured at 70 ° C. for 24 hours to obtain a decorative sheet.

Examples 2-5
As a method for producing a decorative sheet, a decorative sheet was prepared by the same method except that the composition and gloss value were changed as shown in Table 1 below.

Example 6
The following two-component urethane curable ink containing organic acrylic beads with an average particle size of 5 μm as the second design forming layer is applied to the entire surface (solid shape) so as to cover the above-mentioned pattern pattern layer and the first design forming layer with a thickness of 2 μm. A decorative sheet was prepared in the same manner as in Example 1 except that it was formed. The sheet gloss of the portion coated with the second design forming layer has a 75 ° gloss value of 26 for the second design forming layer alone, and 46 when the first design forming layer and the second design forming layer are laminated. It was set to be.
("UHC-NT" manufactured by Showa Ink Industry Co., Ltd. A two-component curable ink containing 6 wt% of acrylic beads with an average particle size of 5 microns and 94 wt% of acrylic polyol as the main ingredient and hexamethylene diisocyanate as the curing agent)

Comparative Example 1
As a method for producing a decorative sheet, a decorative sheet was produced by the same method as in Example 1 except that the first design forming layer provided in Example 1 was not provided as shown in Table 1 below.

Example 7
A urethane cellulose resin (100 parts by weight of a mixture of urethane and nitrified cotton added with 5 parts by weight of hexamethylene diisocyanate) is applied to one surface of a 60 μm thick colored polypropylene film treated with double-sided corona discharge by a gravure coating method. It was applied to form a backside primer layer. The thickness of the back surface primer layer was 1 μm.

Next, a colored solid layer having a thickness of 4 μm was formed by gravure printing using a printing ink using an acrylic urethane resin (100 parts by weight of an acrylic polyol plus 5 parts by weight of hexamethylene diisocyanate) as a binder, and then having a thickness of 3 μm. The pattern layer of the wood grain conduit was painted. The wood grain conduit forms a pattern so that the late wood part has a dark color, and for the early wood part adjacent to the late wood part, the boundary A where the contrast of the light and dark pattern with the late wood part is large and the boundary B where the contrast is small. Was used as the existing pattern.

Next, a urethane-based adhesive was applied onto the pattern, and then a propylene-based resin was heated, melted and extruded from above with a T-die extruder so as to have a thickness of 60 μm to form a transparent resin layer.

The transparent resin layer is subjected to a corona discharge treatment, and an acrylic urethane resin (100 parts by weight of an acrylic polyol plus 5 parts by weight of hexamethylene diisocyanate) is applied to the treated surface by a gravure coating method to form a design layer. A primer layer was formed. The thickness of the primer layer for the design forming layer was 1 μm.

The design forming layer described in Example 2 was provided on the primer layer for the design forming layer.

Next, embossing was performed from the design forming layer side with a wood grain conduit-shaped embossed plate having a plate depth of 50 μm to form a wood grain conduit-shaped uneven pattern, and a decorative sheet was obtained.

Test Example 1
The design effect of the decorative sheets prepared in Examples and Comparative Examples was evaluated by the following methods and criteria.

The entire sheet was visually confirmed under a Panasonic color rendering AA daylight color D6500K light source, and the design effect was judged according to the following criteria.
+++: The difference in gloss of each coated area of the first design forming layer, the second design forming layer, and the third design forming layer was clearly confirmed.
++: The difference in gloss at the boundary between the first design forming layer and the second design forming layer was clearly confirmed.
+: A slight difference in gloss at the boundary between the first design forming layer and the second design forming layer was confirmed.
-: The difference in gloss at the boundary between the first design forming layer and the second design forming layer could hardly be confirmed.

1. 1. Decorative sheet 2. Base material sheet 3. Pattern pattern layer 4. Transparent adhesive layer 5. Transparent resin layer 6. Primer layer for design cambium 7. Third design cambium 8. First design forming layer 9. Second design forming layer 10. Backside primer layer 11. Decorative board base material 12. Decorative board 13. Four-sided sword 14. Four-sided board (with core)
15. Plank 16. Sumime a. Design forming layer b. Dark color part of the pattern c. Light-colored part of the pattern d. The first design forming layer A., which is partially formed in the region of the light-colored portion of the pattern layer so as to be synchronized with the boundary A in which the contrast between the dark-colored portion and the dark-colored portion is large. Of the boundaries between the dark and light parts of the pattern, the boundary A where the contrast between the shades is large
B. Of the boundaries between the dark and light parts of the pattern, the boundary B where the contrast between the shades is small
(I) Relationship between the pattern and the portion forming the first design forming layer when the pattern is a wood grain pattern (particularly a plate pattern) (the part where the arrow indicates the first design forming layer)
(Ii) Relationship between the pattern and the portion forming the first design forming layer when the pattern is a wood grain pattern (particularly a grain pattern) (the part where the arrow indicates the first design forming layer)

Claims (8)

A decorative sheet composed of a laminate having at least a base sheet, a pattern layer, and a design forming layer in order in the thickness direction.
(1) The design forming layer has two layers, a first design forming layer and a second design forming layer, in order from the base sheet side.
(2) The pattern pattern layer is a layer for drawing a pattern in which dark-colored portions and light-colored portions are alternately arranged, and the boundary between the dark-colored portion and the light-colored portion has a large contrast of light and shade. Boundaries B with small contrast between A and shading exist alternately,
(3) The first design forming layer is partially formed in the region of the light-colored portion of the pattern layer so as to be synchronized with the boundary A having a large contrast of light and shade, and the second design forming layer is formed. Is formed so as to cover the pattern layer and the first design forming layer.
(4) When the decorative sheet is viewed in a plan view from the design forming layer side, the degree of gloss of the portion where the first design forming layer and the second design forming layer overlap is set to Gr1, and the first design forming layer is set. Gr2 <Gr1 when the degree of gloss of the portion where the second design forming layer is present is Gr2.
A decorative sheet featuring that. The first aspect of claim 1, wherein the design forming layer further has a third design forming layer, and the third design forming layer is formed on the entire surface between the pattern pattern layer and the first design forming layer. Cosmetic sheet. The decorative sheet according to claim 2, wherein at least one of the first design forming layer, the second design forming layer, and the third design forming layer contains an ionizing radiation curable resin. The decorative sheet according to any one of claims 1 to 3, wherein the second design forming layer contains resin beads. The decorative sheet according to any one of claims 1 to 4, further comprising a transparent resin layer between the pattern layer and the design forming layer. The decorative sheet according to any one of claims 1 to 5, wherein the embossed uneven pattern is formed from the side of the second design forming layer. The pattern of the pattern layer is a wood grain pattern, the dark part depicts the late wood (winter eyes), the light color portion depicts the early wood (Natsume), and the boundary A having a large contrast between the shades is The decorative sheet according to any one of claims 1 to 6, which is a transition portion from the late material to the early material. A decorative board composed of a laminated body including a decorative board base material and the decorative sheet according to any one of claims 1 to 7, in order in the thickness direction.

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