JP6905679B2 - A decorative sheet and a decorative member provided with the decorative sheet - Google Patents

Description

The present invention relates to a decorative sheet and a decorative member provided with the decorative sheet.

Interior or exterior materials for buildings such as walls, ceilings, floors, window frames, doors, handrails, skirting boards, surrounding edges, moldings and other fittings, building materials, kitchens, furniture or light electrical equipment, OA equipment, etc. In general, metal members such as steel plates, resin members, and wood members are used as adherends for the surface decorative board of the cabinet, the interior material or the exterior member of the vehicle, and the decorative member to which the decorative sheet is attached is generally used. in use.

The decorative member as described above is required to have a design property showing a high-class feeling, and the appearance of an uneven shape is imparted to the surface of the decorative sheet.
Various shapes can be adopted as such uneven shapes, but among them, the groove-shaped uneven shape of the conduit portion in the wood grain pattern, the gloss matte-like uneven shape, and the like are typical and are frequently used.
The "gloss matte uneven shape" means an uneven shape in which a high gloss region and a low gloss region are mixed in a pattern on the surface of the article.
The surface of the article having such a structure visually makes the low-gloss area appear to be recessed more than the high-gloss area, regardless of the physical unevenness, by forming the surface of the article into a gloss matte-like uneven shape. It is possible to express a three-dimensional design appearance.

For example, Patent Document 1 discloses a decorative sheet having a base material sheet, a coloring layer, a pattern layer, a permeation prevention layer, a low-gloss pattern ink layer, and a protective layer. In this decorative sheet, a suspension portion is formed by partially mixing the low-gloss pattern ink layer and the surface protective layer. By providing a low-gloss pattern ink layer so that the suspension portion is synchronized with the pattern layer, for example, the conduit portion having a wood grain pattern, the conduit portion can be made to appear as if it is recessed, and the decorative sheet is glossed. Gives a matte feel.
However, the decorative sheet disclosed in Patent Document 1 cannot be said to have sufficient wear resistance and scratch resistance. In addition, it is difficult to control the position and size of the suspension portion, and it is not possible to give a high gloss matte feeling, or an accurate gloss matte feeling can be obtained for a decorative sheet in which a fine pattern is formed on the pattern layer. There was room for improvement in the gloss matte feeling, as it was difficult to give.

Further, Patent Document 2 describes a decorative sheet having a base sheet, a pattern layer, a low-gloss layer, and a high-gloss layer containing a specific polymerization component in this order, wherein the high-gloss layer is at least a low-gloss layer. A decorative sheet is disclosed that has an opening that exposes a portion, and the opening forms a recess on the surface of the decorative sheet. A decorative sheet having such a configuration usually expresses an area where the appearance of a concave portion on a pattern should be expressed by using physical unevenness in addition to a gloss matte feeling.
However, there is still room for improvement in the abrasion resistance, scratch resistance, and stain resistance of the decorative sheet disclosed in Patent Document 2.

Japanese Unexamined Patent Publication No. 2006-95973 Japanese Unexamined Patent Publication No. 2014-188842

The present inventors further increase the thickness of the high-gloss layer in the decorative sheet disclosed in Patent Document 2 in order to effectively reproduce the uneven appearance of the pattern for the purpose of improving wear resistance and scratch resistance. If an attempt is made to increase the size, a hemming portion is formed in the high-gloss layer, and the high-gloss layer is formed up to the place where the recess is originally formed, so that the gloss matte feeling cannot be accurately given (recessed). It seems that the part that I tried to look like is convex).
Now, the present inventors have been able to increase the thickness of the high-gloss layer by forming the high-gloss layer with a thermosetting resin composition containing a specific polymerization component, without causing a tailing portion. It is possible to improve the abrasion resistance and scratch resistance, and it is found that an accurate and high gloss matte feeling can be imparted to the decorative sheet, and the decorative sheet provided with such a high gloss layer can be used. It was found that the stain resistance was also improved.
Furthermore, the present inventors have added a matting agent having an oil absorption amount in a specific range to the low-gloss layer to give the decorative sheet a high matte feeling even when the thickness of the low-gloss layer is increased. It was found that it can be imparted and a difference in gloss value between the low gloss layer and the high gloss layer can be sufficiently generated, so that a better gloss matte feeling can be imparted to the decorative sheet.
The present invention is based on such findings, and the problem to be solved thereof is to provide a decorative sheet having high abrasion resistance, scratch resistance, stain resistance and a good gloss matte feeling, and a decorative member provided with the same. That is.

In order to solve the above problems, the present invention provides the following inventions.
(1) A decorative sheet having a base sheet, a pattern layer, a low-gloss layer, and a high-gloss layer in this order.
The high gloss layer has an opening that exposes at least a portion of the low gloss layer.
The opening of the high gloss layer forms a recess on the surface of the decorative sheet.
The high gloss layer is formed of a cured product of an ionizing radiation curable resin composition.
The ionizing radiation curable resin composition contains a polyfunctional (meth) acrylate oligomer having a number average molecular weight of 1,000 to 3,000 and functional groups of 2 to 8, and a cellulosic polymer having a number average molecular weight of 10,000 to 30,000. And
A decorative sheet in which a low-gloss layer contains a matting agent having an oil absorption of 300 to 400 mL / 100 g.
(2) The decorative sheet according to (1) above, wherein the content of the matting agent in the low gloss layer is 15 to 45% by mass.
(3) The decorative sheet according to (1) or (2) above, wherein the average particle size of the matting agent is 0.1 to 10 μm.
(4) The decorative sheet according to any one of (1) to (3) above, wherein the difference between the gloss value of the high gloss layer and the gloss value of the low gloss layer is 5 or more.
(5) The decorative sheet according to any one of (1) to (4) above, wherein the gloss value of the high gloss layer is 10 or more and 20 or less.
(6) The decorative sheet according to any one of (1) to (5) above, wherein the low-gloss layer contains a thermosetting resin.
(7) The decorative sheet according to any one of (1) to (6) above, wherein the low-gloss layer contains a two-component curable polyurethane resin which is a reaction product of a polyol and an isocyanate compound.
(8) The decorative sheet according to any one of (1) to (7) above, wherein the content of the polyfunctional (meth) acrylate-based oligosaccharide in the ionizing radiation curable resin composition is 15 to 95% by mass.
(9) The decorative sheet according to any one of (1) to (8) above, wherein the content of the cellulosic polymer in the ionizing radiation curable resin composition is 1 to 10% by mass.
(10) The decorative sheet according to any one of (1) to (9) above, wherein the high gloss layer has a thickness of 8 to 20 μm.
(11) The decorative sheet according to any one of (1) to (10) above, wherein the ionizing radiation curable resin composition contains inorganic particles having an average particle size of 0.1 to 10 μm.
(12) The ionizing radiation curable resin composition according to any one of (1) to (11) above, which comprises a polyfunctional (meth) acrylate-based monomer having a number average molecular weight of 100 to 500 and a functional group number of 2 to 8. The listed cosmetic sheet.
(13) Ratio of the content of the polyfunctional (meth) acrylate-based oligomer to the content of the polyfunctional (meth) acrylate-based monomer in the ionizing radiation curable resin composition (content of the polyfunctional (meth) acrylate-based oligomer). The decorative sheet according to (12) above, wherein the amount / content of the polyfunctional (meth) acrylate-based monomer) is 99/1 to 20/80 on a mass basis.
(14) The decorative sheet according to any one of (1) to (13) above, wherein the pattern layer forms a wood grain pattern, and the recesses are provided so as to be synchronized with the conduit portion of the wood grain pattern.
^{(15) The brightness (L *} 1) of the region where the high gloss layer occupies 50% or more and 80% or less in the plan view, and the area ratio occupied by the concave portion in the plan view is 50% or more and 80% or less. The brightness (L ^* 2) of the area is measured by irradiating the surface of the decorative sheet on the high gloss layer side with light using the following measurement conditions, and the brightness difference (ΔL ^* = L ^* 1-) is measured. The decorative sheet according to (14) above, wherein L ^{* 2) is 10 or more.}
(Measurement condition)
Measuring device: CM-3700d manufactured by Konica Minolta Co., Ltd.
Measurement size: Circle with a diameter of 8 mm Light source: D65 light source Viewing angle: 2 °
(16) A decorative member comprising an adherend and the decorative sheet according to any one of (1) to (15) so that the adherend and the base sheet of the decorative sheet face each other.

According to the present invention, there is provided a decorative sheet having high abrasion resistance, scratch resistance, stain resistance and a good gloss matte feeling, and a decorative member provided with the decorative sheet.

FIG. 1 is a schematic cross-sectional view showing the configuration of a decorative sheet according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing the configuration of a decorative member according to an embodiment of the present invention. FIG. 3 shows a wood grain pattern formed on the pattern layer in the embodiment. FIG. 4 shows a wood grain pattern formed on the pattern layer in the embodiment.

[Cosmetic sheet]
Hereinafter, the decorative sheet according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a side view schematically showing the configuration of the decorative sheet 10 according to the embodiment of the present invention.

As shown in FIG. 1, the decorative sheet 10 according to the embodiment of the present invention has a base sheet 11, a pattern layer 12, a low gloss layer 13, and a high gloss layer 14 in this order.
Further, as shown in FIG. 1, the high-gloss layer 14 has an opening that exposes at least a part of the low-gloss layer 13, and this opening forms a recess 14'on the surface of the decorative sheet.
Further, the decorative sheet 10 may have a colored layer 15 between the base sheet 11 and the pattern layer 12. Further, the decorative sheet 10 may have a primer layer between arbitrary layers (not shown).
Hereinafter, the configuration of each layer and the like will be described in detail.

(Base sheet)
As the base material sheet 11, a paper material, a resin film formed by using a resin, a metal foil, a metal sheet, wood, a ceramic material, or the like can be used. Further, as the base material sheet 11, a laminated body in which these are arbitrarily laminated may be used.

For example, as the paper material that can be used as the base sheet 11, thin leaf paper, kraft paper, titanium paper, coated paper, art paper, sulfate paper, glassin paper, parchment paper, paraffin paper, and inter-paper reinforced papers thereof are used. And resin-impregnated paper and the like. Among these, thin paper, inter-paper reinforced paper, and resin-impregnated paper are preferable from the viewpoint of heat resistance and strength. From the viewpoint of moisture resistance, it is preferable to use polysand paper in which a polyethylene film is sandwiched between two sheets of paper.

Examples of the resin constituting the resin film include polyolefin resins such as polyethylene (HDPE, MDPE, LDPE, LLDPE), polypropylene, and polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, and vinyl chloride-vinyl acetate. Vinyl resins such as polymers, ethylene-vinyl acetate copolymers and ethylene-vinyl alcohol copolymers, polyester resins such as polyethylene terephthalate, polyvinyl terephthalate, polyethylene naphthalate-isophthalate copolymers, nylon-6, Examples thereof include polyamide resins such as nylon-6 and 6, styrene resins such as polystyrene, and the like.

Examples of the metal constituting the metal foil and the metal sheet include aluminum, iron, copper, stainless steel and the like.

Examples of ceramic materials include gypsum board, calcium silicate board, wood piece cement board, earthenware, glass, enamel, and fired tile.

The base sheet 11 is subjected to an oxidation method or an unevenness method on one or both sides in order to enhance the interlayer adhesion between the base sheet 11 and other layers and the adhesiveness with various adherends 21 described later. Such as physical or chemical surface treatment can be applied. Examples of the oxidation method include corona discharge treatment, chromium oxidation treatment, flame treatment, hot air treatment, ozone / ultraviolet treatment method and the like, and examples of the unevenness method include sandblasting method and solvent treatment method. These surface treatments are appropriately selected according to the type of the base sheet 11, but in general, the corona discharge treatment method is preferably used from the viewpoints of effectiveness, operability, and the like.

When using the paper material as the base material sheet 11, the basis weight is preferably 20 to 100 g / ^{m 2,} and more preferably 23~80g / ^{m 2.}
When the base sheet 11 is other than a paper material, its thickness is preferably 25 to 200 μm, more preferably 38 to 188 μm.

(Colored layer)
In one embodiment, the decorative sheet of the present invention may comprise a colored layer 15.
When the base sheet 11 is colored or has color unevenness, these can be concealed by providing the colored layer 15 on the base sheet 11. Therefore, the stability of the color tone of the pattern layer 12 provided on the base sheet 11 can be ensured, and the design of the decorative sheet 10 can be improved.

The colored layer 15 may contain a binder resin such as a (meth) acrylic resin, a styrene resin, a polyester resin, a urethane resin, a polyolefin resin, a vinyl resin, an alkyd resin, a ketone resin, or a melamine resin. can. Further, the colored layer 15 may contain two or more of these resins.

The colored layer 15 includes inorganic pigments such as carbon black, iron black, titanium white, antimony white, yellow lead, zinc flower, titanium yellow, petal pattern, cadmium red, ultramarine blue, and cobalt blue, quinacridone red, isoindolinone yellow, and phthalocyanine. Organic pigments or dyes such as blue, metal pigments made of scaly foil pieces such as aluminum and brass, titanium dioxide-coated mica, and colorants such as pearl luster (pearl) pigments made of scaly foil pieces such as basic lead carbonate. Can include. Further, the coloring layer 15 may contain two or more kinds of these coloring agents.

The colored layer 15 can contain additives such as a light stabilizer, a flame retardant, a plasticizer, a filler, an antioxidant, and an ultraviolet absorber as long as the characteristics of the present invention are not impaired.

The thickness of the colored layer 15 is not particularly limited, but can be 1 to 30 μm, preferably 5 to 20 μm.

The colored layer 15 is a known means such as a roll coating method, a reverse roll coating method, a gravure coating method, a reverse gravure coating method, a bar coating method and a rod coating method by dispersing or dissolving the above material in water or an appropriate solvent. Therefore, it can be formed by applying it on the base sheet 11 to form a coating film and drying it.

(Pattern layer)
The pattern layer 12 is a layer that imparts a desired pattern to the decorative sheet 10. The pattern is not particularly limited, but is the surface of stone materials such as spring and autumn wood regions of annual ring cross section, wood grain pattern composed of conduits, leather (skin grain) pattern, marble, granite, sand rock, etc. Examples include stone pattern, grain pattern, tile pattern, brick pattern, cloth pattern, geometric figure, character, symbol, and abstract pattern.

The pattern layer 12 may contain one or more of the above-mentioned colorants. The content of the colorant in the pattern layer 12 should be appropriately changed according to the type of the colorant to be used and the pattern to be formed. However, it is preferably 0.5 to 70 parts by mass, and more preferably 1 to 50 parts by mass with respect to 100 parts by mass of the total amount of the resin contained in the pattern layer 12.

The pattern layer 12 may contain a binder resin such as a cellulose resin, a styrene resin, a polyester resin, a urethane resin, a polyolefin resin, a vinyl resin, an alkyd resin, a ketone resin, or a melamine resin. ..

The thickness of the pattern layer 12 is not particularly limited, but can be 0.5 to 15 μm, preferably 1 to 10 μm.

The pattern layer 12 is a known means such as a roll coating method, a reverse roll coating method, a gravure coating method, a reverse gravure coating method, a bar coating method, a rod coating method, etc. by dispersing or dissolving the above material in water or an appropriate solvent. This can be formed by applying the coating onto the base sheet 11 or the colored layer 15 to form a coating film, which is then dried.
Among the above means, it is particularly preferable to use the gravure coating method because it is possible to clearly form even a fine portion of the pattern.

By changing the type of colorant used for forming the pattern layer 12, the amount used, and the pattern to be formed, the difference in brightness (ΔL ^* ) of the decorative sheet described later can be adjusted.

(Low gloss layer)
The low-gloss layer 13 is a layer that gives a matte feeling to the decorative sheet 10, and is a layer that has transparency (colorless and transparent, colored transparent, and translucent) to such an extent that the pattern layer 12 can be visually recognized.

The gloss value of the low gloss layer 13 is preferably 2 to 8 or less, and more preferably 2 to 6 or less. By setting the gloss value of the low gloss layer 13 within the above numerical range, a high matte feeling can be given to the decorative sheet 10, so that a sufficient difference in gloss values between the low gloss layer 13 and the high gloss layer 14 can be generated. It is possible to give a good gloss matte feeling to the decorative sheet 10.
In the present invention, the "gloss value" can be measured at an incident angle of 75 ° in accordance with JIS Z 8741.

The low-gloss layer 13 contains a matting agent, and examples of the matting agent include inorganic particles such as silica, alumina, kaolinite, calcium carbonate, magnesium carbonate, barium sulfate, and glass, and polycarbonate resins. Examples thereof include organic particles such as (meth) acrylic resin, amide resin, urea resin, and silicon resin.
Among these, silica is preferable from the viewpoint of cost, ease of material selection, and dispersion stability with respect to resin.
The shape thereof is not particularly limited, and may be spherical, polyhedral, or scaly.

The oil absorption amount of the matting agent contained in the low gloss layer 13 is 300 to 400 mL / 100 g, and more preferably 360 to 400 mL / 100 g.
By setting the oil absorption amount of the matting agent within the above numerical range, even when the thickness of the low gloss layer 13 is increased for the purpose of improving wear resistance and scratch resistance, the decorative sheet 10 has a high matte feeling. Since it can be imparted, it is possible to sufficiently generate a difference in gloss value between the low gloss layer 13 and the high gloss layer 14, and it is possible to impart a good gloss matte feeling to the decorative sheet 10.
In the present invention, the "oil absorption amount of the matting agent" can be measured according to JIS K 5101.

The average particle size of the matting agent is preferably 0.1 to 10 μm, more preferably 2 to 7 μm. By setting the average particle size of the matting agent within the above numerical range, the dispersibility of the matting agent in the low gloss layer 13 can be improved.
In the present invention, the "average particle size" refers to the primary particle size of the particles, and is the particle size at which the cumulative distribution in the volume distribution measured by the laser diffraction / scattering method is 50%.

The content of the matting agent in the low-gloss layer 13 is preferably 15 to 50% by mass, and more preferably 15 to 45% by mass. By setting the content of the matting agent within the above numerical range, it is possible to impart a better matte feeling to the decorative sheet 10 while maintaining the transparency of the low gloss layer.

The low gloss layer 13 preferably contains a thermosetting resin. Since the low-gloss layer 13 contains the thermosetting resin, it is possible to secure sufficient adhesion strength between the pattern layer 12 and the high-gloss layer 14. Further, in the gravure coating method, when the pattern layer 12 to the high gloss layer 14 are continuously printed, a smooth surface state suitable for forming the high gloss layer 14 can be quickly formed.
Thermocurable resins include unsaturated polyester resins, polyurethane resins (including two-component curable polyurethane resins), epoxy resins, alkyd resins, phenol resins, urea resins, diallyl phthalate resins, and melamine resins. , Guanamine-based resin, silicon resin, polysiloxane-based resin and the like. Among these, a two-component curable polyurethane resin, which is a reaction product of a polyol and an isocyanate compound, is particularly preferable from the viewpoint of moldability and flexibility of the coating film.

Examples of the polyol include polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, polyether polyol, alkyd-modified acrylic polyol, and the like, and among these, polyester polyol is particularly preferable from the viewpoint of thermoplasticity.
Examples of the isocyanate compound include hexamethylene diisocyanate, 2,4-tolylene diisocyanate, xylene diisocyanate, and 4,4-diphenylmethane diisocyanate.

Further, in one embodiment, the low gloss layer 13 may contain an ionizing radiation curable resin.
The ionizing radiation curable resin is a resin having an energy quantum capable of cross-linking and polymerizing molecules in an electromagnetic wave or a charged particle beam, that is, a resin that is cross-linked and cured by irradiating with ultraviolet rays or an electron beam. be. Specifically, a polymerizable monomer, a polymerizable oligomer, and a polymerizable polymer conventionally used as an ionizing radiation curable resin can be appropriately selected and used.
In the present invention, the "oligomer" means a polymer having a number average molecular weight of 500 to 10,000. Further, the "polymer" means a polymer having a number average molecular weight of more than 10,000.
Further, in the present invention, the "number average molecular weight" means a polystyrene-equivalent molecular weight measured by a GPC (gel permeation chromatography) method in accordance with JIS K7252-1.

As the polymerizable monomer, a (meth) acrylate-based monomer having a radically polymerizable unsaturated group in the molecule is preferable, and a polyfunctional (meth) acrylate-based monomer is particularly preferable.
Here, "(meth) acrylate" means "acrylate or methacrylate". The polyfunctional (meth) acrylate means a (meth) acrylate having two or more ethylenically unsaturated bonds in the molecule. One of these polyfunctional (meth) acrylates may be used alone, or two or more thereof may be used in combination.
Examples of the polyfunctional (meth) acrylate include ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and neo. Examples thereof include pentyl glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, and pentyl glycol di (meth) acrylate of hydroxypivalic acid.

Next, as the polymerizable oligomer, an oligomer having a radically polymerizable unsaturated group in the molecule, for example, an epoxy (meth) acrylate-based oligomer, a urethane (meth) acrylate-based oligomer, a polyester (meth) acrylate-based oligomer, or a polyether ( Meta) acrylate-based oligomers and the like can be mentioned.
Examples of the polymerizable polymer include polymers having a radically polymerizable unsaturated group in the molecule, for example, epoxy (meth) acrylate-based polymer, urethane (meth) acrylate-based polymer, polyester (meth) acrylate-based polymer, and polyether (meth) acrylate. Examples include based polymers.

Along with the polyfunctional (meth) acrylate and the like, a monofunctional (meth) acrylate can be appropriately used in combination as long as the characteristics of the present invention are not impaired for the purpose of reducing the viscosity thereof.
Examples of the monofunctional (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and lauryl (meth) acrylate. Can be mentioned. One of these monofunctional (meth) acrylates may be used alone, or two or more thereof may be used in combination.

In addition to thermosetting resins and ionizing radiation curable resins, the low-gloss layer 13 includes thermoplastic resins such as styrene resins, (meth) acrylic resins, and olefin resins, as long as the characteristics of the present invention are not impaired. May include.
Further, the low gloss layer 13 contains additives such as a polymerization initiator, a light stabilizer, a flame retardant, a plasticizer, a filler, an antioxidant, and an ultraviolet absorber as long as the characteristics of the present invention are not impaired. May be good.

The thickness of the low gloss layer 13 is preferably 5 to 20 μm, more preferably 7 to 18 μm. By setting the thickness of the low-gloss layer 13 within the above numerical range, the abrasion resistance and the scratch resistance are improved while maintaining the matte feeling given to the decorative sheet 10 to a good degree.

The low-gloss layer 13 disperses or dissolves the above-mentioned material in water or an appropriate solvent to obtain a composition for forming a low-gloss layer, which is used as a roll coat, a reverse roll coat, a gravure coat, a reverse gravure coat, a bar coat and It can be formed by applying it on the pattern layer 12 by a known means such as a rod coat to form a coating film, and then irradiating it with heat drying or ionizing radiation and curing it.
The temperature for heating and drying is preferably 50 to 200 ° C, more preferably 60 to 150 ° C.
Here, when an electron beam is used as the ionizing radiation, the acceleration voltage is preferably changed as appropriate according to the resin to be used and the thickness of the layer, but is preferably 90 to 165 kV.
The irradiation dose is preferably an amount at which the crosslink density of the ionizing radiation curable resin is saturated, and the specific hand k is preferably 20 to 70 kGy (2 to 7 Mrad), and 30 to 50 kGy (3 to 5 Mrad). It is preferable to have.
The electron beam source is not particularly limited, and for example, various electron beam accelerators such as Cockloft Walton type, Bandegraft type, Resonant transformer type, Insulated core transformer type, Linear type, Dynamitron type, and High frequency type are used. can do.
When ultraviolet rays are used as ionizing radiation, those containing ultraviolet rays having a wavelength of 190 to 380 nm are emitted. The ultraviolet source is not particularly limited, and for example, a high-pressure mercury lamp, a low-pressure mercury lamp, a metal halide lamp, a carbon arc lamp, or the like is used.

(High gloss layer)
The high-gloss layer 14 is a layer partially provided on the low-gloss layer 13 to give a glossy feeling to the decorative sheet 10, and is transparent enough to visually recognize the pattern layer 12 (colorless transparent, colored transparent, translucent). ).
Further, the high-gloss layer 14 has an opening that exposes at least a part of the low-gloss layer 13, and this opening forms a recess 14'on the surface of the decorative sheet 10.

When the wood grain pattern is formed on the pattern layer 12, the recess 14'of the high gloss layer 14 is preferably provided so as to be synchronized with the non-conduit portion of the wood grain pattern. With such a configuration, the high-gloss layer 14 does not exist on the conduit portion and the low-gloss layer 13 is exposed, so that the conduit portion can be made to appear to be recessed, which is good for a decorative sheet. A gloss matte feeling can be given.
In the present invention, "synchronization" means that the position of the conduit portion and the position of the recess 14'match each other in a plan view. Further, "planar view" means that in FIG. 1, one looks down from above toward the same figure.

The gloss value of the high gloss layer 14 is preferably 10 or more and 20 or less, and more preferably 10 or more and 15 or less. By setting the gloss value of the high gloss layer 14 within the above numerical range, a high gloss feeling can be imparted to the decorative sheet 10, so that a sufficient difference in gloss values between the low gloss layer 13 and the high gloss layer 14 can be generated. It is possible to give a good gloss matte feeling to the decorative sheet 10.
Further, by setting the gloss value of the high gloss layer 14 in the above numerical range, it is possible to prevent the occurrence of white blur and to prevent the gloss of the decorative sheet 10 from becoming too high as a whole. When a wood grain pattern is formed on the pattern layer, the feeling of old wood can be expressed, and the design of the decorative sheet 10 can be further improved.

The difference between the gloss value of the high gloss layer 14 and the gloss value of the low gloss layer 13 is preferably 5 or more, more preferably 8 or more, and further preferably 10 or more. By setting the difference between the gloss value of the high gloss layer 14 and the gloss value of the low gloss layer 13 within the above numerical range, the gloss matte feeling of the decorative sheet 10 can be improved.

The high-gloss layer 14 included in the decorative sheet 10 of the present invention is a layer formed by a cured product of an ionizing radiation curable resin composition.
This ionizing radiation curable resin composition comprises a polyfunctional (meth) acrylate-based oligomer having a number average molecular weight of 1,000 to 3,000 and functional groups of 2 to 8, and a cellulosic polymer having a number average molecular weight of 10,000 to 30,000. Contains. By forming the high-gloss layer 14 with the radiation-curable resin composition containing a specific polymerization component in this way, even if the thickness of the high-gloss layer 14 is increased, a hem portion is not generated, and the decorative sheet 10 It is possible to improve the abrasion resistance and the scratch resistance of the decorative sheet 10 and to impart a good gloss matte feeling to the decorative sheet 10. Further, the antifouling property of the decorative sheet 10 can be improved.

Examples of the polyfunctional (meth) acrylate-based oligomer include epoxy (meth) acrylate-based oligomer, urethane (meth) acrylate-based oligomer, polyester (meth) acrylate-based oligomer, polyether (meth) acrylate-based oligomer, and caprolactone-based urethane (meth). Examples thereof include acrylate-based oligomers.

The content of the polyfunctional (meth) acrylate-based oligomer in the ionizing radiation curable resin composition is preferably 15 to 95% by mass, more preferably 20 to 90% by mass. By setting the content of the polyfunctional (meth) acrylate-based oligomer in the above numerical range, it is possible to further prevent the occurrence of the hem portion when the high gloss layer 14 is formed, and the gloss mat is good for the decorative sheet 10. A feeling can be given.

Cellulose-based polymers include cellulosic esters, cellulosic ethers, and derivatives and salts thereof.
Examples of the cellulose ester include carboxylic acid esters such as cellulose acetate, cellulose butyrate and cellulose propionate, inorganic acid esters such as cellulose nitrate, cellulose sulfate and cellulose phosphate, cellulose acetate propionate, cellulose acetate butyrate and cellulose acetate. Examples thereof include mixed acid esters such as phthalate and cellulose acetate acetate.
Examples of the cellulose ether include methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, benzyl cellulose, cyanethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose and the like. Among the above, those having high compatibility with the (meth) acrylate-based oligomer can be appropriately used.

The number average molecular weight of the cellulosic polymer is more preferably 13,000 to 27,000, and even more preferably 15,000 to 25,000.

The content of the cellulosic polymer in the ionizing radiation curable resin composition is preferably 1 to 10% by mass, more preferably 1.5 to 7% by mass. By setting the content of the cellulosic polymer in the above numerical range, it is possible to further prevent the occurrence of the hem portion when the high gloss layer 14 is formed, and to impart a good gloss matte feeling to the decorative sheet 10. Can be done.

Further, the ionizing radiation curable resin composition preferably contains a polyfunctional (meth) acrylate-based monomer having a number average molecular weight of 100 to 500 and a functional group number of 2 to 8. When the high-gloss layer contains such a monomer, the stain resistance of the high-gloss layer 14 can be further improved.

The number average molecular weight of the polyfunctional (meth) acrylate-based monomer is more preferably 200 to 500.
Further, the number of functional groups of the polyfunctional (meth) acrylate-based monomer is more preferably 2 to 6.

Ratio of the content of the polyfunctional (meth) acrylate-based oligomer to the content of the polyfunctional (meth) acrylate-based monomer in the ionizing radiation curable resin composition (content of the polyfunctional (meth) acrylate-based oligomer / many The content of the functional (meth) acrylate-based monomer) is preferably 100/0 to 20/80, more preferably 100/0 to 25/75 on a mass basis. By setting the gun weight ratio within the above numerical range, it is possible to prevent the occurrence of a hemming portion.

Further, the ionizing radiation curable resin composition may contain other polymerization components such as the above-mentioned polymerizable oligomer and polymerizable polymer as long as the characteristics of the present invention are not impaired.

The high-gloss layer 14 preferably contains inorganic particles such as silica, alumina, kaolinite, calcium carbonate, magnesium carbonate, barium sulfate, and glass. Since the high-gloss layer 14 contains inorganic particles, the abrasion resistance and scratch resistance of the high-gloss layer 14 can be improved.

The average particle size of the inorganic particles is preferably 0.1 to 10 μm, more preferably 2 to 7 μm. By setting the average particle size of the inorganic particles in the above numerical range, the abrasion resistance and scratch resistance of the high gloss layer 14 can be further improved.

The content of the inorganic particles in the ionizing radiation curable resin composition is preferably 1 to 15% by mass, more preferably 1 to 13% by mass. By setting the content of the inorganic particles in the above numerical range, the abrasion resistance and scratch resistance of the high gloss layer 14 can be further improved while maintaining the gloss value of the high gloss layer 14.

Further, the ionizing radiation curable resin composition contains additives such as a polymerization initiator, a light stabilizer, a flame retardant, a plasticizer, a filler, an antioxidant, and an ultraviolet absorber as long as the characteristics of the present invention are not impaired. It may be included.

The thickness of the high gloss layer 14 is preferably 8 to 20 μm, more preferably 8 to 12 μm. By setting the thickness of the high gloss layer 14 within the above numerical range, the abrasion resistance and scratch resistance of the decorative sheet 10 can be improved. In addition, it is possible to prevent the occurrence of curl due to curing shrinkage, and it is possible to ensure the ease of processing the decorative sheet. It should be noted that curling can be prevented by using a base sheet having high rigidity, making the constituent material of the high gloss layer 14 having low curing shrinkage, and adjusting the curing conditions. The thickness of the high-gloss layer 14 can be 20 μm or more.

The high-gloss layer 14 disperses or dissolves the ionizing radiation-curable resin composition in water or an appropriate solvent to obtain a high-gloss layer forming composition, which is used as a roll coat, a reverse roll coat, a gravure coat, or a reverse gravure coat. , Bar coat, rod coat and the like, it can be formed by applying it on the low gloss layer 13 to form a coating film, irradiating it with ionizing radiation, and curing it.
Here, when an electron beam is used as the ionizing radiation, the acceleration voltage is preferably changed as appropriate according to the resin to be used and the thickness of the layer, but is preferably 90 to 165 kV.
The irradiation dose is preferably an amount at which the cross-linking density of the ionizing radiation curable resin is saturated, specifically, 20 to 70 kGy (2 to 7 Mrad), and 30 to 50 kGy (3 to 5 Mrad). Is preferable.

^{When a wood grain pattern is formed on the pattern layer 12, the brightness (L *} 1) of the region where the area ratio occupied by the glossy layer is 50% or more and 80% or less in a plan view using a spectrocolorimeter and Light is applied to the surface of the decorative sheet 10 on the high gloss layer 14 side using the following measurement conditions to measure ^{the brightness (L *} 2) of the region where the area ratio of the concave portion is 50% or more and 80% or less in a plan view. The brightness difference (ΔL ^* = L ^* 1-L ^* 2) measured by irradiation is preferably 10 or more, more preferably 12 or more, and further preferably 14 or more. The measurement conditions were as follows. "Brightness (L ^* )" is "L ^* a ^* b ^* color system L ^* value", and "L ^* a ^* b ^* color system" is CIE (International Commission on Illumination). It means a color system that has been standardized and adopted in JIS Z 8781-4: 2013.
(Measurement condition)
Measuring device: CM-3700d manufactured by Konica Minolta Co., Ltd.
Measurement size: Circle with a diameter of 8 mm Light source: D65 light source Viewing angle: 2 °

(Primer layer)
The decorative sheet 10 may have a primer layer and a back surface primer layer in either of the layers in order to improve the adhesion between the layers, if necessary. For example, by providing a primer layer as a back surface primer layer on the base sheet 11 side between the adherend 21 and the base sheet 11, a decorative member having excellent interlayer adhesion can be obtained.

The primer layer is a transparent or translucent layer, and can be formed by using, for example, the resin exemplified as the binder resin. The thickness of the primer layer is usually about 0.5 to 20 μm, preferably 0.5 to 5 μm, and more preferably 0.5 to 3 μm.

[Cosmetic material]
Hereinafter, the decorative member according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a side view schematically showing the configuration of the decorative member 20 according to the embodiment of the present invention.

As shown in FIG. 2, in the decorative member 20 according to the embodiment of the present invention, the adherend 21 and the decorative sheet 10 are opposed to each other so that the adherend 21 and the base sheet 11 of the decorative sheet 10 face each other. Be prepared.

(Adhesion material)
Examples of the adherend 21 include flat plates of various materials, plate materials such as curved plates, three-dimensional articles, sheets (or films), and the like. Specifically, wood members such as wood single board, wood plywood, particle board, MDF (medium density fiber board) and other wood fiber boards and wood members used as three-dimensional articles; , Three-dimensional shaped articles, metal members used as sheets, etc .; ceramics such as glass and ceramics, non-cement ceramic materials such as plaster, non-ceramic ceramic materials such as ALC (lightweight cellular concrete) plates and solids Ceramic members used as shape articles, etc .; polyolefin resins such as acrylic resin, polyester resin, polystyrene resin, polypropylene, ABS (acrylonitrile-butadiene-styrene copolymer) resin, phenol resin, vinyl chloride resin, cellulose resin, Examples thereof include plate materials such as rubber, three-dimensional articles, resin members used as sheets and the like. In addition, these members may be used alone or in combination of two or more.

The adherend 21 may be appropriately selected from the above depending on the intended use, and may be used for interior / exterior members of buildings such as walls, ceilings, and floors, window frames, doors, handrails, skirting boards, peripheral edges, moldings, and the like. When the fitting is used, a wooden member, a metal member, a resin member, and a member in which these are combined are preferable.

The thickness of the adherend 21 may be appropriately selected depending on the application and the material, and is usually preferably 0.1 to 5 mm, more preferably 0.1 to 3 mm.

(Adhesive layer)
The decorative member 20 has an adhesive layer 22 between the adherend 21 and the decorative sheet 10. Although the adhesive layer 22 can be omitted, it is preferable to bond the adherend 21 and the decorative sheet 10 via the adhesive layer 22 in order to obtain excellent adhesiveness.

The adhesive contained in the adhesive layer 22 is not particularly limited, and examples thereof include adhesives such as heat-sensitive adhesives and pressure-sensitive adhesives. Examples of the resin constituting the adhesive include acrylic resin, polyurethane resin, vinyl chloride resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer resin, styrene-acrylic copolymer resin, and polyester resin. , Polyamide-based resin and the like. A two-component curable polyurethane adhesive or polyester adhesive using isocyanate or the like as a curing agent can also be applied. An adhesive can also be used for the adhesive layer 22. Examples of the pressure-sensitive adhesive include acrylic-based, urethane-based, silicone-based, and rubber-based pressure-sensitive adhesives.

The adhesive layer 22 is formed by applying and drying the resin in a form that can be applied such as a solution or an emulsion by a means such as a gravure printing method, a screen printing method, or a reverse coating method using a gravure plate. be able to. The thickness of the adhesive layer is not particularly limited, but is usually in the range of 1 to 100 μm. Within this range, excellent adhesiveness can be obtained.

Examples of the method of laminating the adherend 21 and the decorative sheet 10 include a laminating method of laminating the decorative sheet 10 on a plate-shaped adherend with a pressure roller with an adhesive in between, and an adhesive. A wrapping process in which the decorative sheet 10 is sequentially pressure-bonded and laminated on a plurality of side surfaces constituting the adherend 21 by a plurality of rollers having different orientations while supplying the decorative sheet 10 through the space. , The decorative sheet 10 fixed to the fixed frame is heated by a heater via a silicone rubber sheet until it reaches a predetermined temperature at which the decorative sheet 10 is softened, and the vacuum forming die is pressed against the heated and softened decorative sheet 10 at the same time from the vacuum forming die. A vacuum forming process or the like in which air is sucked by a vacuum pump or the like and the decorative sheet 10 is firmly adhered to the vacuum forming die is preferably mentioned.

When a hot melt adhesive (heat sensitive adhesive) is used in the laminating process or wrapping process, the heating temperature is usually 160 to 200 ° C, and the reactive hot melt adhesive is used, although it depends on the type of resin constituting the adhesive. Then, it is usually about 100 to 130 ° C. Further, in the case of vacuum forming, it is generally performed while heating, and it is usually performed at about 80 to 130 ° C., preferably about 90 to 120 ° C.

The decorative member obtained as described above can be arbitrarily cut, and the surface and the end of the wood can be arbitrarily decorated by grooving, chamfering, etc. using a cutting machine such as a router or a cutter. And various uses, for example, surface decorative boards of interior or exterior members of buildings such as walls, ceilings, floors, balconies, verandas; fittings such as window frames, doors, handrails, skirting boards, surrounding edges, moldings, etc. , Surface veneer for building members; Surface veneer for cabinets such as kitchens, furniture, light electrical equipment, OA equipment; Surface veneer for vehicle interior or exterior; Surface veneer for communication equipment such as mobile phones; Roads, sideways It can be used as a surface decorative board for paved roads (a surface decorative board for giving color, pattern, etc. by laminating on the paved surface of a paved road).

Hereinafter, the present invention will be described in more detail based on examples.

[Example 1] Production of decorative sheet 1. Preparation of base sheet As a base sheet, ^{a paper material having a basis weight of 30 g / m 2} (U-FLEX30 manufactured by Oji F-Tex Co., Ltd.) was prepared.

2. Formation of colored layer and pattern layer On one surface of the base sheet, a colored layer with a thickness of 7 μm and a pattern layer with a wood grain pattern shown in FIG. 3 having a thickness of 4 μm (thickness of conduit portion: about 0) were applied by a gravure printing method. .5 mm) was formed.
Urethane acrylate, acrylic polyol, curing agent and coloring agent (HRA manufactured by DIC Graphics Corporation) are used for forming the coloring layer, and an alkyd resin and coloring agent (DIC) are used for forming the pattern layer. Graphics Co., Ltd., MA) was used.

3. 3. Formation of a low-gloss layer A composition for forming a low-gloss layer having the following composition was applied onto the pattern layer and dried to form a low-gloss layer having a thickness of 10 μm.
The gloss value of the low gloss layer was measured at an incident angle of 75 ° using a portable gloss meter (GMX-202, Murakami Color Technology Laboratory Co., Ltd.) in accordance with JIS Z 8741 and found to be 2.
(Composition for forming a low gloss layer)
・ Acrylic polyol 49% by mass
-Hexamethylene diisocyanate 32% by mass
-Silica (average particle size 3 μm) 19% by mass
・ Appropriate amount of diluent

4. Formation of high-gloss layer A composition for forming a high-gloss layer having the following composition is applied onto the low-gloss layer, and then the applied composition is irradiated with an electron beam (165 kV, 30 kGy) to obtain a thickness of 10 μm. A high-gloss layer was formed, which had an opening that exposed a part of the low-gloss layer, and the opening formed a recess on the surface of the decorative sheet that was synchronized with the conduit portion of the pattern layer. ..
Then, it was heat-cured at 70 ° C. for 24 hours to obtain a decorative sheet.
The gloss value of the high gloss layer was measured at an incident angle of 75 ° using a portable gloss meter (GMX-202, Murakami Color Technology Laboratory Co., Ltd.) in accordance with JIS Z 8741 and found to be 13.
(Composition for forming a high gloss layer)
-Hexfunctional acrylate-based oligomer 90% by mass
・ Cellulose polymer 1.1% by mass
-Silica (6 μm) 8.9 mass%
・ Appropriate amount of diluent

5. Brightness difference (ΔL ^* )
Using a spectrocolorimeter (CM-3700d) manufactured by Konica Minolta Co., Ltd., the measurement size is a circle with a diameter of 8 mm, and the brightness of the area where 50% or more of this circle is occupied by the non-conduit (L ^* 1). ^{The brightness (L *} 2) of the region where 50% of this circle is occupied by the conduit portion was measured, and the difference in brightness (ΔL ^* = L ^* 1-L ^* 2) was determined. The measurement results are shown in Table 1. A D65 light source was used for measuring the brightness, and the viewing angle was set to 2 °.

[Examples 2 to 4]
A decorative sheet was obtained in the same manner as in Example 1 except that the composition of the composition for forming a high gloss layer was changed as shown in Table 1.

[Example 5]
The composition of the composition for forming a high gloss layer was changed as shown in Table 1, and the wood grain pattern formed in the pattern layer was changed to the wood grain pattern shown in FIG. 4 ^{so that the brightness difference (ΔL *) was 10.} A decorative sheet was obtained in the same manner as in Example 1 except for the above.

[Comparative Examples 1 to 5]
A decorative sheet was obtained in the same manner as in Example 1 except that the composition of the composition for forming a high gloss layer was changed as shown in Table 1.

[Performance evaluation]
The decorative sheets obtained in the above Examples and Comparative Examples were evaluated as follows.

(1) Abrasion resistance The surface of the decorative sheet obtained in Examples and Comparative Examples on the base sheet side was attached to a wood plywood having a thickness of 3 mm via a vinyl acetate emulsion adhesive. Next, the wear resistance was evaluated according to the JAS special plywood "wear B test" (S42 abrasive paper, total load 500 g, 100 rotations) and according to the following evaluation criteria. The evaluation results are shown in Table 1.
A: Pattern survival rate is 50% or more B: Pattern survival rate is less than 50%

(2) Scratch resistance The surface of the decorative sheet obtained in Examples and Comparative Examples on the base sheet side was attached to a wood plywood having a thickness of 3 mm via a vinyl acetate emulsion adhesive. The high gloss layer of the decorative sheet was rubbed using a Belmer scratch tester, the load reaching the base sheet was measured, and the scratch resistance was evaluated according to the following evaluation criteria. The weighting was performed every 50 g.
A: The load reaching the base sheet is 200 g or more B: The load reaching the base sheet is 100 g or more and less than 200 g C: The load reaching the base sheet is less than 100 g

(3) Contamination resistance A stain resistance test was conducted in accordance with the JAS special plywood "Pollution A test", and the stain resistance was evaluated according to the following evaluation criteria. The evaluation results are shown in Table 1. A water-based blue ink was used as a contaminant.
A: Blue ink could be wiped off when wiping with ethanol C: Blue ink could not be wiped off when wiping with ethanol

(4) Designability The cosmetic sheets obtained in Examples and Comparative Examples were visually evaluated for their designability under a Panasonic color rendering AA daylight color D6500K light source according to the following evaluation criteria.
A: No hem pulling part was observed, and the gloss matte feeling was accurately given, and the degree was sufficiently high, expressing the feeling of old wood.
B: No hem pulling part was observed, and the gloss matte feeling was given accurately, but the degree was a little weak.
C: The gloss matte feeling was high enough, but the hem pulling part was slightly generated.
D: Occurrence of hem pulling part was observed, and the degree was insufficient, and the feeling of old wood was not expressed.

10: Decorative sheet, 11: Base material sheet, 12: Pattern layer, 13: Low gloss layer, 14: High gloss layer, 14': Recessed, 15: Colored layer, 20: Decorative member, 21: Adhesive material, 22 : Adhesive layer

Claims (16)

A decorative sheet having a base sheet, a pattern layer, a low-gloss layer, and a high-gloss layer in this order.
The high-gloss layer has an opening that exposes at least a portion of the low-gloss layer.
The opening of the high gloss layer forms a recess on the surface of the decorative sheet.
The high gloss layer is formed of a cured product of an ionizing radiation curable resin composition.
The ionizing radiation curable resin composition comprises a polyfunctional (meth) acrylate oligomer having a number average molecular weight of 1,000 to 3,000 and a number of functional groups of 2 to 8, and a cellulose-based polymer having a number average molecular weight of 10,000 to 30,000. It contains 20 to 90% by mass of a polyfunctional (meth) acrylate polymer having a number average molecular weight of 5000 to 15000 and an average number of functional groups of 6 to 15, and a large number of polyfunctional (meth) acrylate polymers having a number average molecular weight of 1000 to 2000 and an average number of functional groups of 2 to 8. Excluding ionizing radiation curable resin compositions containing 10 to 80% by mass of functional (meth) acrylate oligomers) ,
A decorative sheet in which the low-gloss layer contains a matting agent having an oil absorption of 300 to 400 mL / 100 g. The decorative sheet according to claim 1, wherein the content of the matting agent in the low-gloss layer is 15 to 45% by mass. The decorative sheet according to claim 1 or 2, wherein the average particle size of the matting agent is 0.1 to 10 μm. The decorative sheet according to any one of claims 1 to 3, wherein the difference between the gloss value of the high gloss layer and the gloss value of the low gloss layer is 5 or more. The decorative sheet according to any one of claims 1 to 4, wherein the gloss value of the high gloss layer is 10 or more and 20 or less. The decorative sheet according to any one of claims 1 to 5, wherein the low-gloss layer contains a thermosetting resin. The decorative sheet according to any one of claims 1 to 6, wherein the low-gloss layer contains a two-component curable polyurethane resin which is a reaction product of a polyol and an isocyanate compound. The decorative sheet according to any one of claims 1 to 7, wherein the content of the polyfunctional (meth) acrylate-based oligomer in the ionizing radiation curable resin composition is 15 to 95% by mass. The decorative sheet according to any one of claims 1 to 8, wherein the content of the cellulosic polymer in the ionizing radiation curable resin composition is 1 to 10% by mass. The decorative sheet according to any one of claims 1 to 9, wherein the high-gloss layer has a thickness of 8 to 20 μm. The decorative sheet according to any one of claims 1 to 10, wherein the ionizing radiation curable resin composition contains inorganic particles having an average particle size of 0.1 to 10 μm. The cosmetic according to any one of claims 1 to 11, wherein the ionizing radiation curable resin composition contains a polyfunctional (meth) acrylate-based monomer having a number average molecular weight of 100 to 500 and a functional group number of 2 to 8. Sheet. The ratio of the content of the polyfunctional (meth) acrylate-based oligomer to the content of the polyfunctional (meth) acrylate-based monomer in the ionizing radiation curable resin composition (content of the polyfunctional (meth) acrylate-based oligomer). The decorative sheet according to claim 12, wherein the amount / content of the polyfunctional (meth) acrylate-based monomer) is 99/1 to 20/80 on a mass basis. The pattern layer forms a wood grain pattern,
The decorative sheet according to any one of claims 1 to 13, wherein the recess is provided so as to be synchronized with the wood grain-patterned conduit portion. ^{The brightness (L *} 1) of the region where the high gloss layer occupies 50% or more and 80% or less in the plan view and the area ratio occupied by the concave portion in the plan view is 50% or more and 80% or less. The brightness (L ^* 2) of the area was measured by irradiating the surface of the decorative sheet on the high gloss layer side with light using the following measurement conditions, and the brightness difference (ΔL ^* = L ^* 1-L ^{*) was measured.} The decorative sheet according to claim 14 , wherein 2) is 10 or more.
(Measurement condition)
Measuring device: CM-3700d manufactured by Konica Minolta Co., Ltd.
Measurement size: Circle with a diameter of 8 mm Light source: D65 light source Viewing angle: 2 ° A decorative member comprising an adherend and a decorative sheet according to any one of claims 1 to 15 so that the adherend and the base sheet of the decorative sheet face each other.

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