JP2013199032A - Decorative plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative plate that meets non-combustion authorization acquirable requirements and has superior adhesion strength and weather resistance.SOLUTION: In a decorative plate where an adhesive layer and a decorative sheet are sequentially laminated on a metal substrate, (1) a thickness of the metal substrate is 15-50 mm, (2) a thickness of the adhesive layer is 80 μm or lower, (3) a thickness of the decorative sheet is 40-150 μm, and (4) a width of a stacking and pressing part of the decorative sheet is 0-12 mm.

Description

  The present invention relates to a decorative board that satisfies the requirements for obtaining nonflammability certification and is excellent in adhesive strength and weather resistance.

Conventionally, as a decorative plate used for an exterior (for example, a parking lot pole, door, roof, etc.), a decorative plate in which a decorative sheet is attached to a metal base material is known. The decorative board meets the requirements for obtaining non-combustible certification in the exothermic test in accordance with ISO 5660-1 according to Article 2-9 of the Japanese Building Standards Act. That is, the following (i) ) To (iii) requirements:
(i) The total calorific value is 8 MJ / m ² or less,
(ii) no cracks or holes penetrating to the back side, which is harmful to fire protection,
(iii) The maximum heat generation rate shall not exceed “200 kW / m ² or more continuously (continuous) for 10 seconds or more”,
Is required.

  As a decorative sheet for satisfying the above requirements, Patent Document 1 describes a flame retardant decorative sheet having self-extinguishing properties by adding an organic bromine-based flame retardant to a polyolefin resin layer. Moreover, as another decorative sheet for satisfying the above requirements, Reference 2 describes a decorative sheet containing a flame retardant such as aluminum hydroxide in an adhesive layer containing an acrylic adhesive base.

  However, a decorative sheet (and consequently a decorative plate) containing an organic bromine-based flame retardant is difficult to manufacture and process, and has a problem that the weather resistance is lowered. Further, a decorative board having a decorative sheet containing a flame retardant such as aluminum hydroxide has a problem that the adhesive strength between the decorative sheet and the metal substrate is low. On the other hand, a decorative board on which a decorative sheet to which a flame retardant is not added is bonded is difficult to satisfy the above requirements for obtaining non-flammability certification.

JP 2001-219509 A JP 2007-229995 A

  An object of the present invention is to provide a decorative board that satisfies the requirements for obtaining non-combustibility certification (requirements (i) to (iii) above) and is excellent in adhesive strength and weather resistance.

  As a result of intensive studies, the present inventors have found that the above object can be achieved when the thickness of the metal base material, the adhesive layer and the decorative sheet and the width of the overlapped portion of the decorative sheet are in specific ranges, The present invention has been completed.

That is, this invention relates to the following decorative board.
1. A decorative board in which an adhesive layer and a decorative sheet are sequentially laminated on a metal substrate,
(1) The metal substrate has a thickness of 1.5 to 50 mm,
(2) The adhesive layer has a thickness of 80 μm or less,
(3) The decorative sheet has a thickness of 40 to 150 μm,
(4) The width of the overlapping pressing portion of the decorative sheet is 0 to 12 mm.
A decorative board characterized by that.
2. The decorative sheet has a pattern layer, a transparent resin layer, and a surface protective layer in order on the base sheet,
The base sheet and the transparent resin layer contain polyolefin;
The decorative board according to Item 1.
3. Item 3. The decorative board according to Item 1 or 2, wherein the metal substrate contains aluminum.
4). Item 4. The decorative board according to any one of Items 1 to 3, wherein the decorative sheet has a surface protective layer containing an ionizing radiation curable resin.
5. Item 5. The decorative board according to any one of Items 1 to 4, wherein the adhesive forming the adhesive layer is a polyester-based adhesive.

  Hereinafter, the decorative board of the present invention will be described in detail.

The decorative board of the present invention is a decorative board in which an adhesive layer and a decorative sheet are sequentially laminated on a metal substrate,
(1) The metal substrate has a thickness of 1.5 to 50 mm,
(2) The adhesive layer has a thickness of 80 μm or less,
(3) The decorative sheet has a thickness of 40 to 150 μm,
(4) The width of the overlapping pressing portion of the decorative sheet is 0 to 12 mm.
It is characterized by that. Since the decorative board of the present invention having the above characteristics has a specific range for the thickness of each layer and the width of the overlap-pressed portion of the decorative sheet, the nonflammable certification can be obtained even when the flame retardant is not included, that is, (I) to (iii) requirements:
(i) The total calorific value is 8 MJ / m ² or less,
(ii) no cracks or holes penetrating to the back side, which is harmful to fire protection,
(iii) The maximum heat generation rate should not exceed 200 kW / m ^{2 for} more than 10 seconds (continuous),
And excellent in adhesive strength and weather resistance.

≪Exothermic test≫
In the present invention, a test based on the ISO 5660-1 corn calorimeter method (hereinafter, also simply referred to as exothermic test) is employed. This method is a test method for evaluating the combustion properties of building materials such as decorative panels, and is intended to determine the exothermic properties of building materials under the condition of radiant heating.

Specifically, a test piece (10 x 10 cm) is placed horizontally, radiant heating of 50 kW / m ² is applied from above by a cone-type electric heater, ignited by the spark of an electric spark, and burned by the amount of heat generated at that time Determine sex. The calorific value is measured from the oxygen consumption by combustion gas analysis.

  Hereinafter, each structure of the decorative board of this invention is demonstrated.

≪Metal base material≫
The decorative board of the present invention has a metal substrate having a thickness (thickness) of 1.5 to 50 mm. When the thickness is less than 1.5 mm, the maximum heat generation time is increased in the exothermic test (the maximum heat generation speed is increased), and as a result, the maximum heat generation speed is 10 seconds or more in 20 minutes after the start of heating. We may continue to exceed 200 kW / m ^2. On the other hand, the upper limit of 50 mm is the limit of the thickness as a test piece in the exothermic test.

  As the material of the metal substrate, aluminum, iron, hot dip galvanized steel plate, tinplate, tin plate steel plate or the like can be used. Of these, a base material containing aluminum is preferable from the viewpoint of corrosion resistance.

  The shape of the metal substrate may be a cylindrical shape as shown in FIG. When the shape of the metal substrate is cylindrical, a cylindrical decorative plate is obtained by laminating an adhesive layer and a decorative sheet on the metal substrate.

≪Adhesive layer≫
An adhesive layer (adhesive layer A) is laminated on the front surface of the metal substrate.

The thickness of the adhesive layer is 80 μm or less. If it exceeds 80 μm, in the exothermic test, the maximum heat generation rate in 20 minutes after the start of heating may continue for more than 10 seconds and exceed 200 kW / m ² or more. The thickness of the adhesive layer is preferably 60 to 80 μm.

  Examples of the adhesive used in the adhesive layer include polyester adhesives, acrylic adhesives, urethane adhesives, and the like. An adhesive agent can be used 1 type or in combination of 2 or more types.

≪Makeup sheet≫
A decorative sheet is laminated on the front surface of the adhesive layer (adhesive layer A).

The thickness of the decorative sheet is 40 to 150 μm. If it exceeds 150 μm, the total calorific value for 20 minutes after the start of heating may exceed 8 MJ / m ² in the exothermic test. The thickness of the decorative sheet is preferably 60 to 150 μm from the viewpoint of weather resistance and the like.

In the decorative board of the present invention, the width of the overlapping holding portion of the decorative sheet is 0 to 12 mm. The overlap holding part of the decorative sheet is 4. in FIG. As shown, the part where the decorative sheet is doubled (the part where the decorative sheet is laminated on the decorative sheet) is shown. The width of the overlap-pressed portion of the decorative sheet is shown in 5. of FIG. As shown, the width of the portion where the decorative sheet is doubled is shown. The width of 0 to 12 mm means that the overlapping pressing portion does not exist (that is, the width of the overlapping pressing portion of the decorative sheet is 0 mm) or the overlapping pressing portion exists and the width is 12 mm or less. Indicates. When the width of the overlapped pressing portion exceeds 12 mm, the total heat generation amount for 20 minutes after the start of heating may exceed 8 MJ / m ² in the exothermic test.

  Specific examples where the width of the decorative sheet overlying part is 0 mm include (1) a decorative board in which one decorative sheet is bonded to a metal substrate, and (2) two or more sheets to a metal substrate. And a decorative board on which the decorative sheet is bonded. In the decorative board in which one or two or more decorative sheets are bonded to the metal base material, the decorative sheets do not overlap each other.

  Specific examples of a decorative sheet having a stacking pressing portion and a width of 12 mm or less include (1) a decorative board in which two decorative sheets are bonded to a metal substrate, A decorative board having a portion where two decorative sheets are overlapped, (2) a metallic base plate having a cylindrical shape, and a single decorative sheet laminated as shown in FIG. And a decorative board having a portion in which the decorative sheet is overlapped.

  The structure of the decorative sheet of the present invention is not limited. For example, the decorative sheet has a pattern layer (solid ink layer / pattern ink layer), an adhesive layer, a transparent resin layer, and a surface protective layer in this order on the base sheet. preferable. Hereinafter, this decorative sheet will be exemplarily described.

Base sheet As base sheet: 1) Paper such as thin paper, fine paper, kraft paper, Japanese paper, titanium paper, resin impregnated paper, inter-paper reinforced paper, etc. 2) Wood fiber, glass fiber, asbestos, polyester fiber, vinylon 3) Polyolefins such as polyethylene and polypropylene; Polyesters such as polyethylene terephthalate and polybutylene terephthalate; Polyacryls; Polyamides; Polyurethanes; Synthetic resin sheets such as polystyrene (synthetic resin layers) 1 type or 2 types or more of laminated bodies are mentioned. The base sheet preferably contains a polyolefin.

  When the base sheet is a laminate and has two or more (two or more) synthetic resin layers, the resin components in each synthetic resin layer may be the same or different.

  The thickness of the base sheet is preferably about 20 to 150 μm, more preferably 50 to 100 μm. The substrate sheet may be colored as necessary. Further, the surface may be subjected to surface treatment such as corona discharge treatment, plasma treatment, or ozone treatment.

Pattern Pattern Layer The pattern pattern layer is composed of a pattern ink layer and / or a solid ink layer. The pattern layer can be formed by a printing method such as gravure printing, offset printing, silk screen printing or the like. Examples of the pattern of the pattern ink layer include a wood grain pattern, a stone pattern, a cloth pattern, a skin pattern, a geometric pattern, characters, symbols, line drawings, various abstract patterns, and the like. The solid ink layer is obtained by solid printing of colored ink. The pattern pattern layer is composed of one or both of a pattern ink layer and a solid ink layer.

  As the ink used for the pattern layer, as the vehicle, chlorinated polyolefin such as chlorinated polyethylene and chlorinated polypropylene, polyester, polyurethane composed of isocyanate and polyol, polyacryl, acrylic urethane resin, polyvinyl acetate, polyvinyl chloride, A vinyl chloride-vinyl acetate copolymer, a cellulose resin, a polyamide resin, or the like may be used alone or in combination of two or more, and a pigment, a solvent, various auxiliary agents, and the like may be added thereto to make an ink. Among these, from the viewpoint of environmental problems, adhesion to the printing surface, and the like, one or a mixture of two or more of polyester, polyurethane made of isocyanate and polyol, polyacryl, acrylic urethane resin, polyamide resin, and the like is preferable. .

  The thickness of the pattern layer is not particularly limited and can be set as appropriate according to product characteristics. The layer thickness at the time of coating is about 1 to 15 μm, and the layer thickness after drying is about 0.1 to 10 μm.

Adhesive layer The adhesive layer (adhesive layer B) is provided between the pattern layer and the transparent resin layer. The adhesive layer can be obtained, for example, by applying and drying a known dry lamination adhesive such as a two-component curable urethane resin.

  The thickness of the adhesive layer after drying is preferably about 0.1 to 30 μm, more preferably about 1 to 20 μm.

Transparent resin layer The transparent resin layer is not particularly limited as long as it is a transparent resin layer. For example, the transparent resin layer can be suitably formed of a transparent thermoplastic resin. Specifically, soft, semi-rigid or rigid polyvinyl chloride, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer Examples thereof include polymers, ionomers, polyacrylic acid esters, and polymethacrylic acid esters. Among the above, polyolefins such as polyethylene and polypropylene are preferable.

  The transparent resin layer may be colored. In this case, a colorant may be added to the thermoplastic resin. As the colorant, pigments or dyes used in the pattern layer can be used.

  For the transparent resin layer, various kinds of fillers, matting agents, foaming agents, lubricants, antistatic agents, antioxidants, ultraviolet absorbers, light stabilizers, radical scavengers, soft components (eg rubber), etc. Additives may be included.

  The thickness of the transparent resin layer is preferably about 20 to 150 μm, more preferably about 50 to 100 μm.

Primer layer The primer layer can be provided to improve the adhesion between the transparent resin layer and the surface protective layer. The primer layer is a transparent or translucent layer and can be formed using the resin exemplified as the vehicle of the pattern layer.

  The thickness of the primer layer is preferably about 0.5 to 20 μm, more preferably about 1 to 5 μm.

Surface Protective Layer The surface protective layer (transparent surface protective layer) is provided for imparting surface physical properties such as scratch resistance, abrasion resistance, water resistance and stain resistance required for a decorative sheet. As the resin for forming the surface protective layer, curable resins such as thermosetting resins and ionizing radiation curable resins are preferable. In particular, ionizing radiation curable resins are preferable from the viewpoint of high surface hardness, productivity, and the like.

  Examples of thermosetting resins include unsaturated polyester resins, polyurethane resins (including two-component curable polyurethane), epoxy resins, amino alkyd resins, phenol resins, urea resins, diallyl phthalate resins, melamine resins, guanamine resins, and melamines. -Urea co-condensation resin, silicon resin, polysiloxane resin and the like.

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

  Examples of the method for forming the surface protective layer with a thermosetting resin include a method in which a solution of a thermosetting resin is applied by a coating method such as a roll coating method or a gravure coating method and then dried and cured. The coating amount of the solution is about 5 to 30 μm, preferably about 5 to 20 μm in terms of solid content.

  The ionizing radiation curable resin is not limited as long as it is a resin that undergoes a crosslinking polymerization reaction upon irradiation with ionizing radiation and changes to a three-dimensional polymer structure. For example, one or more prepolymers, oligomers and monomers having a polymerizable unsaturated bond or epoxy group that can be crosslinked by irradiation with ionizing radiation in the molecule can be used. Examples thereof include acrylate resins such as urethane acrylate, polyester acrylate, and epoxy acrylate; silicon resins such as siloxane; polyester resins; epoxy resins and the like.

  Examples of the ionizing radiation include visible light, ultraviolet light (near ultraviolet light, vacuum ultraviolet light, etc.), X-rays, electron beams, ion beams, etc. Among them, ultraviolet light or electron beams are desirable.

  As the ultraviolet light source, a light source such as an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light fluorescent lamp, or a metal halide lamp can be used. The wavelength of ultraviolet rays is about 190 to 380 nm.

  As the electron beam source, various electron beam accelerators such as a cockcroft-wald type, a bandegraft type, a resonant transformer type, an insulating core transformer type, a linear type, a dynamitron type, and a high frequency type can be used. The energy of the electron beam is preferably about 100 to 1000 keV, more preferably about 100 to 300 keV. The irradiation amount of the electron beam is preferably about 2 to 15 Mrad.

  The ionizing radiation curable resin is sufficiently cured when irradiated with an electron beam, but it is preferable to add a photopolymerization initiator (sensitizer) when it is cured by irradiation with ultraviolet rays.

  Examples of the photopolymerization initiator in the case of a resin system having a radically polymerizable unsaturated group include acetophenones, benzophenones, thioxanthones, benzoin, benzoin methyl ether, Michler benzoylbenzoate, Michler ketone, diphenyl sulfide, dibenzyl disulfide. , Diethyl oxide, triphenylbiimidazole, isopropyl-N, N-dimethylaminobenzoate and the like can be used. In the case of a resin system having a cationic polymerizable functional group, for example, at least one kind such as an aromatic diazonium salt, an aromatic sulfonium salt, a metallocene compound, a benzoin sulfonic acid ester, and a freeloxysulfoxonium diallyl iodosyl salt. Can be used.

  Although the addition amount of a photoinitiator is not specifically limited, Generally it is about 0.1-10 mass parts with respect to 100 mass parts of ionizing radiation curable resins.

  As a method for forming a protective layer with an ionizing radiation curable resin, for example, a solution of an ionizing radiation curable resin may be applied by a coating method such as a gravure coating method or a roll coating method. The coating amount of the solution is generally about 5 to 30 μm, preferably about 5 to 20 μm as a solid content.

  In order to further impart scratch resistance and abrasion resistance to the surface protective layer formed from the ionizing radiation curable resin, an inorganic filler may be blended. Examples of inorganic fillers include powdered aluminum oxide, silicon carbide, silicon dioxide, calcium titanate, barium titanate, magnesium pyroborate, zinc oxide, silicon nitride, zirconium oxide, chromium oxide, iron oxide, boron nitride, Diamond, gold sand, glass fiber, etc. are mentioned.

  The addition amount of the inorganic filler is about 1 to 80 parts by mass with respect to 100 parts by mass of the ionizing radiation curable resin.

  For the lamination of each layer, for example, a pattern layer (solid ink layer, pattern ink layer) is formed on one side of the base sheet by printing in order, and then a known dry lamination such as a two-component curable urethane resin is formed on the pattern layer. A transparent resin layer can be laminated by a dry lamination method, a T-die extrusion method, or the like through an adhesive layer (adhesive layer B) by an adhesive, and further a surface protective layer can be formed.

  An uneven pattern may be formed by embossing from the transparent resin layer side or the surface protective layer side. The concavo-convex pattern can be formed by heating press, hairline processing or the like. Examples of the uneven pattern include a conduit groove, a stone plate surface unevenness, a cloth surface texture, a satin finish, a grain, a hairline, and a line groove.

  The decorative board of the present invention is suitable as a decorative board used for exterior applications such as a parking lot pole, door, roof, and the like.

The decorative board of the present invention is a nonflammable certification acquisition requirement (ie, (i) the total calorific value for 20 minutes after starting heating is 8 MJ / m ² or less, and (ii) 20 minutes after starting heating, harmful for fire prevention And (iii) a decorative board satisfying (iii) a maximum heat generation rate not exceeding 200 kW / m ^{2 for} 20 minutes after starting heating and not exceeding 200 kW / m ² or more) Excellent adhesion strength and weather resistance.

It is a schematic diagram which shows an example of the laminated constitution of the cylindrical decorative board (no overlap pressing part) of this invention. It is a schematic diagram which shows an example of the laminated constitution of the cylindrical decorative board (with an overlap pressing part) of this invention. It is a schematic diagram which shows an example of the layer structure of the cylindrical decorative board (with an overlap pressing part) of this invention, and an example of the test piece of the said decorative board. It is a schematic diagram which shows the test piece of this-application Example 6. FIG. It is a schematic diagram which shows the test piece of this-application Example 8.

Examples 1-5 and Comparative Examples 1-3
≪Preparation of decorative sheet≫
Corona discharge treatment was performed on both surfaces of a base sheet made of polypropylene resin having a thickness of 60 μm. Next, a 2 μm-thick pattern layer was formed on the front surface of the base sheet by a gravure printing method using a printing ink made of an acrylic urethane resin. Next, a transparent adhesive layer (thickness 3 μm) is formed by applying an adhesive formed by adding 11 parts by mass of hexamethylene diisocyanate to 100 parts by mass of an acrylic polyol-urethane mixed resin on the pattern layer. Formed. Further, a thermoplastic transparent resin layer (thickness 80 μm) was formed on the adhesive layer by heating and extruding polypropylene resin with a T-die extruder. Next, a primer layer having a thickness of 2 μm was formed by applying a resin composition obtained by adding 6 parts by mass of hexamethylene diisocyanate to 100 parts by mass of the acrylic polyol-urethane mixed resin on the transparent resin layer. Next, an electron beam curable resin composition containing a urethane (meth) acrylate oligomer in the primer layer is applied and dried to a thickness of 5 μm by a gravure coating method, and then an electron is applied under conditions of an acceleration voltage of 175 keV and 5 Mrad (50 kGy). The surface protective layer was formed by irradiating the line. Furthermore, the embossing by the hot pressure was given from the said surface protective layer side, the uneven | corrugated pattern of the wood grain conduit pattern was formed, and the decorative sheet of Example 1 was obtained.
≪Preparation of decorative board≫
A polyester adhesive (trade name “PES-360” manufactured by Toagosei Co., Ltd.) was applied to the back side of the decorative sheet. Next, a decorative sheet was attached to the outer periphery of a cylindrical aluminum material using an aluminum extruded profile (A6063S-T5) so that the aluminum material and the adhesive were in contact with each other. Thereby, the decorative board was obtained. In addition, since the length of the long side of the decorative sheet is equal to the outer periphery of the aluminum material, the decorative sheet does not have the overlapping holding portion of the decorative sheet.

Examples 6 to 9 and Comparative Example 4
≪Preparation of decorative sheet≫
A decorative sheet was produced in the same manner as in Examples 1 to 5 and Comparative Examples 1 to 3.
≪Preparation of decorative board≫
The polyester adhesive was applied to the back side of the decorative sheet. Next, a decorative sheet was attached to the outer periphery of a cylindrical aluminum material using an aluminum extruded profile (A6063S-T5) so that the aluminum material and the adhesive were in contact with each other. Thereby, the decorative board was obtained. In addition, since the length of the long side of the decorative sheet is longer than the outer periphery of the aluminum material, the decorative sheet has an overlapping holding portion of the decorative sheet.

Comparative Example 5
≪Preparation of decorative sheet≫
An organic bromine-based flame retardant (trade name “Frame Cut 110R” manufactured by Tosoh Corporation) is added to a 60 μm-thick polypropylene resin so that the amount is 60 parts by mass with respect to 100 parts by mass of the resin component. A decorative sheet was produced in the same manner as in Examples 1 to 5 and Comparative Examples 1 to 3 except that the material sheet was used.
≪Preparation of decorative board≫
The decorative board was produced like Examples 1-5 and Comparative Examples 1-3.

Comparative Example 6
≪Preparation of decorative sheet≫
A decorative sheet was produced in the same manner as in Examples 1 to 5 and Comparative Examples 1 to 3.
≪Preparation of decorative board≫
In a polyester-based adhesive, add an aluminum hydroxide-containing flame retardant (trade name “Martinal” manufactured by Albemarle Japan Co., Ltd.) so as to be 30 parts by mass with respect to 100 parts by mass of the adhesive, and bond this A decorative board was produced in the same manner as in Examples 1 to 5 and Comparative Examples 1 to 3 except that the agent was used.

Test Example 1 (Exothermic test)
The decorative boards obtained in Examples 1 to 9 and Comparative Examples 1 to 6 were cut as shown in FIG. 3 to prepare 100 mm × 100 mm test pieces. The test piece was tested for 20 minutes in accordance with the ISO 5660-1 corn calorimeter method. In the exothermic test, a corn calorimeter manufactured by Toyo Seiki Co., Ltd. was used. The evaluation criteria were as follows.
A: All the following requirements (1) to (3) are satisfied;
(1) The total calorific value for 20 minutes after the start of heating is 8 MJ / m ² or less,
(2) No cracks or holes penetrating to the back side, which is harmful for fire prevention, for 20 minutes after the start of heating,
(3) The maximum heat generation rate shall not exceed 200 kW / m ² or more for 20 minutes after the start of heating for 10 seconds or more.
B: At least one of the above requirements (1) to (3) is not satisfied.

Test Example 2 (Adhesive strength)
The adhesive strength was measured according to the test method of JIS Z0237 for the decorative plates obtained in Examples 1 to 9 and Comparative Examples 1 to 6. The evaluation criteria were as follows. A or B is actually preferable for exterior use.
A: More than 30N / inch B: More than 20N / inch and less than 30N / inch C: Less than 20N / inch

Test Example 3 (Weather resistance)
UV lamp (trade name “M04-L21WB / SUV”, manufactured by Iwasaki Electric Co., Ltd.), lamp jacket (trade name “WJ50-SUV”, manufactured by Iwasaki Electric Co., Ltd.), and illuminance meter (trade name “UVD-365PD”) A super accelerated weathering test apparatus (trade name “I Super UV Tester SUV-W131”, manufactured by Iwasaki Electric Co., Ltd.) equipped with Iwasaki Electric Co., Ltd. was prepared. The black panel temperature of the super accelerated weathering test apparatus is set to 63 ° C. and the illuminance is set to 60 mW / cm ² , reaching 200 hours for the decorative boards obtained in Examples 1 to 9 and Comparative Examples 1 to 6. Until then, 20 hours of irradiation and 4 hours of condensation were repeated. The appearance of the decorative board after the test was observed. The evaluation criteria were as follows. If it is A or B, it can actually be used for exterior use.
A: No change in appearance
B: Some whitening is observed, but there is no problem in design. C: Whitening is clearly seen. The test results are shown in Table 1 below.

  In the table, “-” indicates “none”. In the table, * 1 indicates that in the 100 mm × 100 mm test piece, the center of the position of the overlap holding portion is 50 mm from the sheet edge. In the table, * 2 indicates that in the 100 mm × 100 mm test piece, the center of the position of the overlap holding portion is 25 mm from the sheet end. In the table, * 3 indicates that in the 100 mm × 100 mm test piece, the center of the position of the overlap holding portion is 10 mm from the sheet edge.

1. 1. Cylindrical metal substrate 2. Adhesive Cosmetic sheet 4. 4. Overpressing part 5. Width of overlap holding part 6. Distance from the sheet edge to the center of the overlap holding part Cut location 8. Test piece in exothermic test 9. Metal substrate

Claims (5)

A decorative board in which an adhesive layer and a decorative sheet are sequentially laminated on a metal substrate,
(1) The metal substrate has a thickness of 1.5 to 50 mm,
(2) The adhesive layer has a thickness of 80 μm or less,
(3) The decorative sheet has a thickness of 40 to 150 μm,
(4) The width of the overlapping pressing portion of the decorative sheet is 0 to 12 mm.
A decorative board characterized by that. The decorative sheet has a pattern layer, a transparent resin layer, and a surface protective layer in order on the base sheet,
The base sheet and the transparent resin layer contain polyolefin;
The decorative board according to claim 1.   The decorative board according to claim 1 or 2, wherein the metal substrate contains aluminum.   The decorative board according to any one of claims 1 to 3, wherein the decorative sheet has a surface protective layer containing an ionizing radiation curable resin.   The decorative board in any one of Claims 1-4 whose adhesive agent which forms the said adhesive bond layer is a polyester-type adhesive agent.

Images