JP5431787B2 - Light-transmitting electromagnetic wave shield laminate capable of bending and method for producing the same - Google Patents

Description

  The present invention is excellent in bending workability and impact resistance, which is useful as a window material and cover for industrial equipment, covers and casings of machinery and electronic equipment, automobiles, vehicles, ships, airplanes, houses, hospitals and offices. The present invention relates to a light transmissive electromagnetic wave shield laminate.

  In recent years, electromagnetic waves generated from electronic devices such as personal computers, mobile phones, flat panel displays typified by liquid crystal and plasma, touch panels, car navigation systems, personal digital assistants, and motors of industrial machinery have caused malfunctions in industrial machinery and electronic devices. It causes a communication failure and is a big problem. Furthermore, it has been pointed out that electromagnetic waves may adversely affect the human body, and measures are taken with various electromagnetic shielding materials in order to prevent so-called electromagnetic interference (hereinafter referred to as EMI).

  Since sufficient strength cannot be obtained with the electromagnetic wave shielding material alone, a method of laminating the electromagnetic wave shielding material with various light transmissive resin base materials or glass base materials is used. From the viewpoint of safety, a light-transmitting electromagnetic wave shielding laminate based on polycarbonate resin, which is excellent in impact resistance and heat resistance, is preferable, but covers and housings for industrial equipment such as semiconductor manufacturing equipment, industrial machinery, and various electronic equipment. When used as a window material or cover for bodies, automobiles, vehicles, ships, airplanes, houses, hospitals, offices, etc., bending workability is often required from the viewpoint of design and safety. However, because polycarbonate resin has high heat resistance, it is forced to bend at high temperatures, so in general heating methods such as electric furnaces, lot heaters and ceramic heaters using nichrome wire or halogen lamp as a heat source. Due to the front and back surfaces and the in-plane temperature distribution, the light transmission type electromagnetic wave shield laminate is warped, causing problems such as bubbles, whitening, and peeling. Further, when the light-transmitting electromagnetic wave shield laminate is heated up and down using these heating methods, not only will the wrinkles and deformation occur, but the adhesive layer will also fluctuate, resulting in a significant decrease in appearance and visibility. I have it. Moreover, the bending technique of the light transmission type electromagnetic wave shield laminate has not been disclosed yet.

  As a thermoforming method of a thermoplastic resin sheet using a far infrared ray as a heat source, Patent Document 1 describes a thermoforming method by vacuum forming and pressure forming, but it was applied to bending a light-transmitting electromagnetic wave shield laminate. In this case, there is a problem in that the product is warped due to a temperature difference between the upper and lower sides of the laminate and the laminate is peeled off due to residual strain due to heating by a far infrared heater from one side of the laminate.

  As a method for bending a synthetic resin laminate, Patent Document 2 describes a method for bending a synthetic resin laminate comprising a polycarbonate resin substrate and an acrylic resin plate. However, a polycarbonate resin plate (150 to 180 ° C.) and an acrylic resin are described. Since the heating temperature of the resin-based resin plate (100 to 130 ° C.) is different, the product is warped due to the difference in temperature between the upper and lower sides of the laminate or the shrinkage rate of the material, or the laminate is peeled off due to residual strain. There is a point.

  Patent Document 3 describes a heating method in which heaters such as a nichrome wire heater, an infrared heater, and a far-infrared heater are disposed on both surfaces of a methacrylic resin laminate as a method of bending a methacrylic resin laminate as a bending method of the synthetic resin laminate. However, when the entire surface is simply heated, there is a problem that not only the warp and the deformation are caused, but also the appearance and visibility are remarkably lowered because the adhesive layer is fluctuated.

In Patent Document 4, as a method for bending a polycarbonate laminate, a polycarbonate laminate is prepared using a moisture-curable hot melt adhesive, a thermoplastic polyester resin adhesive, or a thermoplastic silane-modified resin adhesive, and then hot-pressed. Although bending methods are described, these adhesives have problems such as bubbles, whitening, and peeling due to deterioration or decomposition of the adhesive layer in the optimum bending temperature range of the polycarbonate resin laminate 140 to 180 ° C. is there.
Japanese Patent Laid-Open No. 11-188787 JP-A-9-239936 Japanese Patent Laid-Open No. 6-31482 Japanese Patent No. 3994404

  In view of the problems of the prior art, the present invention provides a light-transmitting electromagnetic wave shield laminate that is excellent in bending workability that minimizes fluctuation and residual distortion of an adhesive layer and does not cause deformation, warpage, or peeling. For the purpose.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have used a far-infrared heater heating device to raise and lower a laminate having a thickness of 0.1 mm to 30 mm obtained by laminating a polycarbonate substrate on one side or both sides of an electromagnetic wave shielding layer. In the method of bending by radiant heating from both sides, the upper heater heats the entire surface, and the lower heater selectively heats the bending width of the bent portion within the range shown in equation (1), and the surface temperature difference is controlled within 20 ° C. Bending the shield laminate heated to 140 ° C. to 185 ° C. into a curved surface having a curvature radius of 10 mm or more, thereby minimizing the fluctuation and residual distortion of the adhesive layer, and preventing bending, deformation and peeling. The present inventors have found that a light-transmitting electromagnetic wave shield laminate having excellent properties can be obtained, and have completed the present invention.
Heating width = 2πR × (180 ° −X °) / 360 ° × Y (1)
Here, π is a circumference, R is a radius of curvature, X is a bending angle (inner angle), and Y is a coefficient (1.35 ≦ Y ≦ 4.15).

  The light-transmitting electromagnetic wave shield laminate of the present invention has excellent transparency or visibility because it minimizes fluctuation and residual distortion of the adhesive layer even under high-temperature bending conditions and does not cause deformation, warping or peeling. Excellent electromagnetic shielding performance, transparency or visibility, such as covers and casings for industrial equipment, machinery and electronic equipment with bending workability, window materials and covers for automobiles, vehicles, ships, aircraft, houses, hospitals and offices It is used in a wide range of electromagnetic shielding fields that require long-term durability and bending workability at the same time.

  In a method of bending a laminate of two or more layers in which a polycarbonate base material is laminated on one side or both sides of an electromagnetic wave shielding layer by radiant heating from both the upper and lower sides with a far infrared heater heating device, the upper heater is heated entirely, The heater is a curved surface with a curvature radius of 10 mm or more when the heating width of the bent portion is selectively heated within the range shown in the formula (1) and the surface temperature difference is controlled within 20 ° C. and heated to 140 ° C. to 185 ° C. The present invention relates to a light-transmitting electromagnetic wave shield laminate having a thickness of 0.1 mm to 30 mm and a method for producing the same.

  The light transmission type electromagnetic wave shield laminate described in the present invention is composed of a laminate of two or more layers including an electromagnetic wave shield layer for preventing inflow of electromagnetic waves generated from various electronic devices, machines, motors, etc. and a polycarbonate substrate. Depending on the case, it may be applied to one or both sides of the electromagnetic shielding layer from the viewpoint of impact resistance, scratch resistance, weather resistance, water resistance, antistatic property, moisture resistance, antifogging property, antireflection property, antifouling property, etc. A protective layer may be disposed. More specifically, all laminated type light-transmitting electromagnetic wave shielding laminates using a metal thin film mesh, a metal woven mesh, a conductive fiber mesh, and a conductive printing mesh using a conductive compound as an electromagnetic shielding layer are shown.

  The electromagnetic wave shielding performance of the electromagnetic wave shielding layer is preferably 30 dB or more. If the shielding performance is 30 dB or less, it is not possible to completely prevent the leakage of electromagnetic waves generated from electronic devices, which may cause malfunctions and communication failures of other machines and electronic devices. Electromagnetic waves entering from the inside cannot be prevented, and there is a possibility of damaging the electronic equipment.

  In order to achieve the electromagnetic wave shielding performance, the surface resistivity (sheet resistance value) of the electromagnetic wave shielding layer is preferably 10 [Ω / □] or less. More preferably, it is 1 [Ω / □] or less, and still more preferably 0.1 [Ω / □] or less.

  The conductive compound constituting the electromagnetic wave shielding layer is not particularly limited as long as it has conductivity, but iron, gold, silver, copper, aluminum, nickel, carbon, ITO (indium oxide / tin oxide), ZnO (zinc oxide) A metal compound containing at least one metal component selected from tin, zinc, titanium, tungsten, and stainless steel can be used. From an economical viewpoint, it is preferable to use a conductive compound containing at least one metal component selected from silver, copper, aluminum, nickel, carbon, ZnO (zinc oxide), tin, and stainless steel.

  The electromagnetic wave shielding layer is a metal thin film mesh or a conductive printing mesh using a conductive compound. The method for producing the metal thin film mesh is not particularly limited. For example, a metal such as copper, silver, aluminum, ITO (indium oxide / tin oxide), ZnO (zinc oxide) is formed on the surface of the light transmissive organic polymer material film or sheet. A thin film formed by vapor deposition or sputtering, or a method of forming a mesh by means such as etching after laminating these metal foils with an adhesive, gravure printing, ink jet printing, screen printing with plating catalyst-containing ink or paste After applying by electroless plating, electroless plating or electroplating is used to form a mesh, rolling a metal plate of copper, silver, aluminum, etc., and punching a metal foil to a predetermined thickness to form a mesh The method of doing is mentioned. These metal thin film meshes are preferably blackened on one side or both sides from the viewpoints of water resistance, moisture resistance, corrosion resistance, rust prevention, and antireflection. The metal thin film mesh preferably has a line width of 5 to 200 μm, a thickness of 0.01 to 100 μm, and a pitch of 100 to 1000 μm from the viewpoint of electromagnetic wave shielding performance and transparency.

There is no restriction | limiting in particular as an adhesive agent for metal foil which forms a metal thin film mesh, The well-known adhesive agent and adhesive agent with favorable transparency, water resistance, moisture resistance, and adhesive force can be used.
Examples of the adhesive include known photocurable adhesives, thermosetting adhesives, hot melt adhesives, and the like.

  Examples of the pressure-sensitive adhesive include pressure-sensitive adhesives such as known acrylic resin compositions, polyurethane-based resin compositions, polyester-based resin compositions, epoxy-based resin compositions, silicone-based resin compositions, and rubber-based resin compositions. I can do it. Among these, the pressure-sensitive adhesive of an acrylic resin composition having excellent transparency, water resistance, moisture resistance and adhesive strength is most preferable.

  Examples of hot melt adhesives include polyolefin resin compositions such as ethylene- (meth) acrylic acid copolymer resin compositions, ethylene- (meth) acrylic acid ester copolymer resin compositions, and polystyrene resin compositions. , Ethylene vinyl acetate resin composition, vinyl acetate resin composition, acrylic resin composition, polyurethane resin composition, polyester resin composition, epoxy resin composition, polyester resin composition, polyamide resin Examples thereof include a composition, a polyvinyl ether resin composition, a silicone resin composition, and a rubber resin composition. Among these, a hot melt adhesive of an acrylic resin composition having excellent transparency, water resistance, moisture resistance and adhesive strength is most preferable.

  The thermosetting adhesive is not particularly limited as long as it is polymerized by heat. For example, functional groups such as glycidyl group, acryloyl group, methacryloyl group, hydroxyl group, carboxyl group, isocyanurate group, amino group, amide group, etc. These compounds can be used alone or in combination of two or more. For example, epoxy resin composition, acrylic resin composition, silicone resin composition, phenol resin composition, thermosetting polyimide resin composition, polyurethane resin composition, polyester resin composition, melamine resin A composition, a urea-type resin composition, etc. are mentioned. From the viewpoint of adhesive strength and transparency, acrylic resin compositions such as epoxy acrylate resin compositions, urethane acrylate resin compositions, polyether acrylate resin compositions, and polyester acrylate resin compositions are preferred. These thermosetting adhesives can be used in combination of two or more as required. Moreover, it is preferable to use a curing agent in combination with the thermosetting adhesive composition. As the curing agent, known curing agents can be used, such as isocyanate curing agents, amines such as triethylenetetramine, xylenediamine, N-aminotetramine, diaminodiphenylmethane, phthalic anhydride, maleic anhydride, and dodecyl anhydride. Acids, acid anhydrides such as pyromellitic anhydride and benzophenone tetracarboxylic anhydride, diaminodiphenylsulfone, tris (dimethylaminomethyl) phenol, polyamide resin, dicyandiamide, ethylmethylimidazole, and the like can be used. These curing agents may be used alone or in combination of two or more.

Examples of photocurable adhesives include urethane (meth) acrylate adhesive compositions, polyester (meth) acrylate adhesive compositions, epoxy (meth) acrylate adhesive compositions, and polyol (meth) acrylate adhesives. It is preferable that it is at least any one (meth) acrylate adhesive composition selected from the agent composition, and among these, urethane (meta) is preferred from the viewpoints of water resistance, moisture resistance, weather resistance, transparency and adhesive strength. ) Acrylate adhesive composition is particularly preferred.
The photocurable (meth) acrylate adhesive composition having curability by irradiation with active energy rays is particularly preferable from the viewpoints of curing time and safety, and visible light or ultraviolet rays are preferable as the active energy rays.

  The conductive printing mesh can be used by any manufacturing method, and is not particularly limited. For example, metal particle compounds such as copper, silver, aluminum, nickel, carbon, etc., epoxy, urethane A mesh is formed on the surface of a light-transmitting organic polymer material film or sheet by a method such as screen printing, gravure printing, or offset printing, using an ink or paste mixed with a resin binder such as acrylic, acrylic or EVA. A method is mentioned. The conductive printing mesh preferably has a line width of 10 to 200 μm, a thickness of 1 to 100 μm, and a pitch of 100 to 1000 μm from the viewpoint of electromagnetic shielding performance and transparency.

  Examples of the light-transmitting organic polymer material used as a metal thin film mesh and conductive printing mesh film or sheet base material include polycarbonate resin, polyethylene terephthalate resin, polyester resin, polyethersulfone resin, polyethylene naphthalate resin, and polystyrene. Resin, polyurethane resin, polyvinyl alcohol resin, polymethyl methacrylate resin, alicyclic polyolefin resin, light-transmitting polyimide resin, polyamide resin, acrylic resin, polyacrylonitrile resin, polyvinyl chloride resin, polyvinylidene chloride resin, polypropylene resin, polyethylene Resin etc. are mentioned.

  Among these light transmissive organic polymer materials, polycarbonate resin, polyester resin, and polyethylene terephthalate resin are particularly preferable from the viewpoints of transparency, impact resistance, and versatility.

  The metal woven mesh can be a metal woven mesh obtained by any manufacturing method, and is not particularly limited. For example, a method of forming a mesh by knitting metal wires such as stainless steel, copper, silver, gold, and iron. Is mentioned. The smaller the mesh size and the thicker the metal wire diameter, the higher the electromagnetic shielding performance. On the other hand, the visibility is lowered, and therefore the mesh size is preferably 50 to 300 mesh and the metal wire diameter is preferably 10 to 200 μm. The mesh size indicates a mesh size defined by the Taylor standard sieve.

  As the conductive fiber mesh, any conductive fiber mesh obtained by any manufacturing method can be used, and there is no particular limitation. For example, a conductive metal compound such as nickel or copper is added to a surface-treated synthetic fiber such as polyester. Examples thereof include a conductive fiber mesh subjected to electroless plating and further blackened. The mesh size is preferably 50 to 300 mesh and the fiber diameter is preferably 10 to 100 μm.

  The light transmission type electromagnetic wave shielding laminate of the present invention is an electromagnetic wave from the viewpoint of impact resistance, scratch resistance, weather resistance, water resistance, antistatic property, moisture proofing, antifogging property, antireflection property, antifouling property, etc. It is preferable to arrange a protective layer on one side or both sides of the shield layer. As long as the protective layer is visible and allows light to pass through, the protective layer may be a film or sheet material made of a light-transmitting organic polymer material, or may be a film having various functionalities.

  The light transmissive organic polymer material is not particularly limited as long as it is visible and allows light to pass through. The light transmissive organic polymer material includes various materials such as metal compounds, conductive compounds, organic compounds, and inorganic compounds that have been bonded, vapor-deposited, applied, printed, and processed. Examples of the light transmissive organic polymer material include polycarbonate resin, polyethylene terephthalate resin, polyester resin, polyether sulfone resin, polyethylene naphthalate resin, polystyrene resin, polyurethane resin, polyvinyl alcohol resin, polymethyl methacrylate resin, and alicyclic ring. Examples thereof include a polyolefin resin, a light-transmitting polyimide resin, a polyamide resin, an acrylic resin, a polyacrylonitrile resin, a polyvinyl chloride resin, a polyvinylidene chloride resin, a polypropylene resin, and a polyethylene resin.

  Among these light transmissive organic polymer materials, polycarbonate resin or polyethylene terephthalate resin is particularly preferable from the viewpoints of transparency, impact resistance, and versatility.

The coating is not particularly limited, but is a silicone resin compound that is excellent in long-term durability and has a relatively high surface hardness, or an acrylic resin that can be processed relatively easily and has a good coating. A polyfunctional acrylic resin is preferred. The curing method of these films depends on the properties of the resin compound used, but it is preferable to select a thermosetting or photocurable resin in consideration of productivity and simplicity. As an example of the photocurable resin, there may be mentioned a resin composition in which a photopolymerization initiator is added as a curing catalyst to a resin composition composed of one or more monofunctional or polyfunctional acrylate monomers or oligomers. Examples of the thermosetting resin include polyorganosiloxane and cross-linked acrylic resins. Such a resin composition is commercially available as a hard coat agent, and may be appropriately selected in consideration of suitability with the coating line.
In addition to UV absorbers, light stabilizers, and antioxidants, these coatings can also contain various stabilizers such as organic solvents and anti-coloring agents, leveling agents, antifoaming agents, thickeners, and antistatic agents. A surfactant such as an antifogging agent may be added as appropriate.

  In the light transmission type electromagnetic wave shield laminate of the present invention, it is preferable to appropriately install a ground for the purpose of sufficiently exhibiting the shielding performance and to prevent leakage of electromagnetic waves. There are no particular restrictions on the method of installing the earth, but for example, a conductive material in which a metal particle compound such as copper, silver, aluminum, nickel or carbon is mixed with a resin binder such as epoxy, urethane, acrylic or EVA. Examples include a method of applying a conductive paste to the outer periphery of the end surface of the light transmission type electromagnetic wave shield laminate, a method of coating the outer periphery of the end surface of the light transmission type electromagnetic wave shield laminate with a conductive tape, and a method using these in combination. It is preferable to cover 70% or more of the outer periphery of the end surface with a conductive paste or tape.

  The (meth) acrylate-based adhesive composition used in the present invention includes a urethane (meth) acrylate-based adhesive composition, a polyester (meth) acrylate-based adhesive composition, an epoxy (meth) acrylate-based adhesive composition, and It is preferably at least any one (meth) acrylate-based adhesive composition selected from polyol (meth) acrylate-based adhesive compositions, and more preferably a urethane (meth) acrylate-based adhesive composition. .

  The (meth) acrylate-based adhesive composition used in the present invention is preferably a solvent-free (meth) acrylate-based adhesive composition in consideration of environmental properties and handling properties, for example, photocurable (meth) acrylate. Examples thereof include a thermosetting adhesive composition, a thermosetting (meth) acrylate adhesive composition, and a hot melt (meth) acrylate adhesive composition. Among these, a photocurable (meth) acrylate adhesive composition having curability by irradiation with active energy rays is particularly preferred from the viewpoint of curing time and safety, and visible light or ultraviolet rays are preferred as the active energy rays.

  The (A) (meth) acrylate polymerizable monomer used in the present invention is not particularly limited, and various (meth) acrylate polymerizable monomers can be used. Such (meth) acrylate polymerizable monomers include mono-, di- and poly (meth) acrylate compounds of aliphatic alcohols having 2 to 20 carbon atoms, diols and polyhydric alcohols, glycerin, trimethylolpropane, pentaerythritol. Poly (meth) acrylates of terminal hydroxy compounds having 30 or less carbon atoms including aliphatic ether bonds, ester bonds, carbonate bonds branched with polyhydric alcohols such as alicyclic compounds and aromatics in their skeletons Examples thereof include compounds having a group compound. Specifically, a monofunctional (meth) acrylate polymerizable monomer having one (meth) acryloyloxy group in the molecule [hereinafter referred to as a monofunctional (meth) acrylate monomer. ], Bifunctional (meth) acrylate polymerizable monomer having two (meth) acryloyloxy groups in the molecule [hereinafter referred to as bifunctional (meth) acrylate monomer. ] And a polyfunctional (meth) acrylate polymerizable monomer having at least three (meth) acryloyloxy groups in the molecule [hereinafter referred to as a polyfunctional (meth) acrylate monomer. ]. One or more (meth) acrylate monomers can be used.

  Specific examples of monofunctional (meth) acrylate monomers include tetrahydrofurfuryl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxy- 3-phenoxypropyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentenyl (meth) acrylate, benzyl (meth) acrylate , Isobornyl (meth) acrylate, phenoxyethyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, ethyl cal In addition to tall (meth) acrylate, trimethylolpropane mono (meth) acrylate, pentaerythritol mono (meth) acrylate, phenoxypolyethylene glycol (meth) acrylate, 2- (meth) acryloyl as a carboxyl group-containing (meth) acrylate monomer Oxyethyl phthalic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, carboxyethyl (meth) acrylate, 2- (meth) acryloyloxyethyl succinic acid, N- (meth) acryloyloxy-N ′, N′— Examples include dicarboxy-p-phenylenediamine and 4- (meth) acryloyloxyethyl trimellitic acid. Monofunctional (meth) acrylate monomers include vinyl group-containing monomers such as N-vinylpyrrolidone and (meth) acryloylamino group-containing monomers such as 4- (meth) acryloylamino-1-carboxymethylpiperidine. Is done.

  Bifunctional (meth) acrylate monomers include alkylene glycol di (meth) acrylates, polyoxyalkylene glycol di (meth) acrylates, halogen-substituted alkylene glycol di (meth) acrylates, di (meth) acrylates of fatty acid polyols, Typical examples include di (meth) acrylates of bisphenol A or bisphenol F alkylene oxide adducts, and epoxy di (meth) acrylates of bisphenol A or bisphenol F, but are not limited thereto. Things can be used. Specific examples of the bifunctional (meth) acrylate monomer include ethylene glycol di (meth) acrylate, 1,3-butanediol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, and 1,6-hexane. Diol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane di (meth) acrylate, pentaerythritol di (meth) acrylate, ditrimethylolpropane di ( (Meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, polyethylene glycol Rudi (meth) acrylate, polypropylene glycol di (meth) acrylate, polytetramethylene glycol di (meth) acrylate, hydroxypivalate ester neopentyl glycol di (meth) acrylate, 2,2-bis [4- (meth) Acryloyloxyethoxyethoxyphenyl] propane, 2,2-bis [4- (meth) acryloyloxyethoxyethoxycyclohexyl] propane, 2,2-bis [4- (meth) acryloyloxyethoxyethoxyphenyl] methane, hydrogenated dicyclo Examples include pentadienyl di (meth) acrylate and tris (hydroxyethyl) isocyanurate di (meth) acrylate.

  Multifunctional (meth) acrylate monomers include glycerin tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, pentaerythritol tri (meth) Poly (meth) of trivalent or higher aliphatic polyols such as acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, etc. Acrylate is a typical example. In addition, poly (meth) acrylate of a trivalent or higher valent halogen-substituted polyol, tri ( T) acrylate, trimethylolpropane alkylene oxide adduct tri (meth) acrylate, 1,1,1-tris [(meth) acryloyloxyethoxyethoxy] propane, tris (hydroxyethyl) isocyanurate tri (meth) acrylates Is mentioned.

  The (B) (meth) acrylate oligomer used in the present invention is a bifunctional or higher polyfunctional urethane (meth) acrylate oligomer [hereinafter referred to as a polyfunctional urethane (meth) acrylate oligomer. ] Bifunctional or higher polyfunctional polyester (meth) acrylate oligomer [hereinafter referred to as polyfunctional polyester (meth) acrylate oligomer]. ] Bifunctional or higher polyfunctional epoxy (meth) acrylate oligomer [hereinafter referred to as polyfunctional epoxy (meth) acrylate oligomer]. ] Bifunctional or higher polyfunctional polyol (meth) acrylate oligomer [hereinafter referred to as polyfunctional polyol (meth) acrylate oligomer]. And the like. One or more (meth) acrylate oligomers can be used.

  As the polyfunctional urethane (meth) acrylate oligomer, an isocyanate compound obtained by reacting polyols with polyisocyanate, and a (meth) acrylate monomer having at least one (meth) acryloyloxy group and hydroxyl group in one molecule; The urethanization reaction product of is mentioned. Among urethane (meth) acrylate oligomers, urethane (meth) acrylate oligomers containing an alicyclic hydrocarbon compound excellent in water resistance, moisture resistance, weather resistance and adhesive strength are preferred. Among these, urethane (meth) acrylate oligomers using isophorone diisocyanate or dicyclohexylmethane diisocyanate as a raw material are preferable, and urethane (meth) acrylate oligomers using dicyclohexylmethane diisocyanate as a raw material are particularly preferable.

  Examples of the (meth) acrylate monomer having at least one (meth) acryloyloxy group and hydroxyl group in one molecule used for the urethanization reaction include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, glycerin di (meth) acrylate, trimethylolpropane di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol penta (Meth) acrylate is mentioned.

  Polyisocyanates used in the urethanization reaction include hexamethylene diisocyanate, lysine diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, tolylene diisocyanate, xylylene diisocyanate, and diisocyanates obtained by hydrogenating aromatic isocyanates among these diisocyanates. (For example, diisocyanates such as hydrogenated tolylene diisocyanate and hydrogenated xylylene diisocyanate), di- or tri-polyisocyanates such as triphenylmethane triisocyanate and dimethylene triphenyl triisocyanate, or polyisocyanates obtained by multiplying diisocyanates Is mentioned. Among these, isophorone diisocyanate and dicyclohexylmethane diisocyanate which are excellent in water resistance, moisture resistance and weather resistance are preferable, and dicyclohexylmethane diisocyanate is particularly preferable.

  As the polyols used for the urethanization reaction, generally, in addition to aromatic, aliphatic and alicyclic polyols, polyester polyols, polyether polyols and the like are used. Usually, aliphatic and alicyclic polyols include 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, ethylene glycol, propylene glycol, trimethylol ethane, trimethylol propane, dimethylol heptane, diethylene Examples include methylol propionic acid, dimethylol butyric acid, glycerin, and hydrogenated bisphenol A.

  The polyester polyol is obtained by a dehydration condensation reaction between the above polyols and a polybasic carboxylic acid (anhydride). Specific compounds of polybasic carboxylic acids include (anhydrous) succinic acid, adipic acid, (anhydrous) maleic acid, (anhydrous) trimellitic acid, hexahydro (anhydrous) phthalic acid, (anhydrous) phthalic acid, isophthalic acid, Examples include terephthalic acid. In addition to the polyalkylene glycol, the polyether polyol includes a polyoxyalkylene-modified polyol obtained by a reaction of the polyol or phenols with an alkylene oxide.

  Many urethane (meth) acrylate oligomers are commercially available and can be easily obtained. Examples of these urethane (meth) acrylate oligomers include a beam set 575, a beam set 551B, a beam set 550B, a beam set 505A-6, a beam set 504H, a beam set 510, a beam set 502H, a beam set 575CB, and a beam. Set 102 (above, trade name of urethane (meth) acrylate oligomer made by Arakawa Chemical Co., Ltd.), Photomer 6008, Photomer 6210 (above, trade name of urethane (meth) acrylate oligomer made by San Nopco), NK Oligo U-4HA, NK Oligo U-108A, NK Oligo U-1084A, NK Oligo U-200AX, NK Oligo U-122A, NK Oligo U-340A, NK Oligo U-324A, NK Oligo UA-100, NK Rigo MA-6 (above, trade name of urethane (meth) acrylate oligomer manufactured by Shin-Nakamura Chemical Co., Ltd.), Aronix M-1100, Aronix M-1200, Aronix M-1210, Aronix M-1310, Aronix M- 1600, Aronix M-1960 (above, product name of urethane (meth) acrylate oligomer made by Toagosei Co., Ltd.), AH-600, AT-606, UA-306H (above, Kyoeisha Chemical Co., Ltd. urethane (meth)) Acrylic oligomer trade name), Kayrad UX-2201, Kayarad UX-2301, Kayarad UX-3204, Kayarad UX-3301, Kayarad UX-4101, Kayarad UX-6101, Kayarad UX-7101 (above, Nippon Kayaku Co., Ltd.) Company made Tan (meth) acrylate oligomer trade name), purple light UV-1700B, purple light UV-3000B, purple light UV-3300B, purple light UV-3520TL, purple light UV-3510TL, purple light UV-6100B, purple light UV-6300B, purple light UV- 7000B, Violet UV-7210B, Violet UV-7550B, Violet UV-2000B, Violet UV-2250TL, Violet UV-2010B, Violet UV-2580B, Violet UV-2700B (above, Nippon Synthetic Chemical Industries Urethane (Meta) Trade name of acrylate oligomer), Art Resin UN-9000PEP, Art Resin UN-9200A, Art Resin UN-9000H, Art Resin UN-1255, Art Resin UN-5200, Art Resin UN-2111A, Art Resin UN -330, Art Resin UN-3320HA, Art Resin UN-3320HB, Art Resin UN-3320HC, Art Resin UN-3320HS Art Resin UN-6060P (above, trade names of urethane (meth) acrylate oligomers manufactured by Negami Kogyo Co., Ltd.) ), Laromer UA19T, Laromer LR8949, Laromer LR8987, Laromer LR8983 (above, product names of urethane (meth) acrylate oligomers manufactured by BASF), Diabeam UK6053, Diabeam UK6055, Diabeam UK6039, Diamond Beam U60 Diamond Beam UK6074, Diamond Beam UK6097 (above, urethane (meth) acrylate manufactured by Mitsubishi Rayon Co., Ltd. Ebecryl 254, Ebecryl 264, Ebecryl 265, Ebecryl 1259, Ebecryl 4866, Ebecryl 1290K, Ebecryl 5129, Ebecryl 2283, Ebecryl 2283 ) Etc.

  The polyfunctional polyester (meth) acrylate oligomer is obtained by a dehydration condensation reaction of (meth) acrylic acid, polybasic carboxylic acid (anhydride) and polyol. Polybasic carboxylic acids (anhydrides) used in the dehydration condensation reaction include (anhydrous) succinic acid, adipic acid, (anhydrous) maleic acid, (anhydrous) itaconic acid, (anhydrous) trimellitic acid, and (anhydrous) pyromellitic. Acid, hexahydro (anhydrous) phthalic acid, (anhydrous) phthalic acid, isophthalic acid, terephthalic acid, etc. are mentioned. The polyol used for the dehydration condensation reaction is 1,4-butanediol, 1,6-hexanediol, diethylene glycol, triethylene glycol, propylene glycol, neopentyl glycol, dimethylol heptane, dimethylol propionic acid, dimethylol butyrate. Examples include phosphonic acid, trimethylolpropane, ditrimethylolpropane, pentaerythritol, dipentaerythritol and the like.

  Specifically, Aronix M-6100, Aronix M-7100, Aronix M-8030, Aronix M-8060, Aronix M-8530, Aronix M-8050 (above, polyester (meth) acrylate oligomers manufactured by Toagosei Co., Ltd.) Trade name), Laromer PE44F, Laromer LR8907, Laromer PE55F, LaromerPE46T, Laromar LR8800 (named above, trade names of polyester (meth) acrylate oligomers manufactured by BASF), Ebecryl80, Ebecryl 8007, Ebecryl 8007 , Ebecryl 584 (polyester (meth) acrylic manufactured by Daicel UCB Co., Ltd.) The trade name over the door system of oligomers), Photomer RCC13-429, Photomer 5018 (or more, San Nopco Co., Ltd. polyester (meth) trade name of the oligomer of the acrylate-based), and the like.

  A polyfunctional epoxy (meth) acrylate oligomer is obtained by addition reaction of polyglycidyl ether and (meth) acrylic acid. The polyfunctional epoxy (meth) acrylate oligomer is not particularly limited, and various epoxy (meth) acrylate oligomers can be used. Such an epoxy (meth) acrylate oligomer has a structure in which (meth) acrylic acid is added to an epoxy oligomer, and is a bisphenol A-epichlorohydrin type, a modified bisphenol A type, an amine modified type, a phenol novolak-epichlorohydrin type. , Aliphatic type and alicyclic type. For example, polyglycidyl ether includes ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, tripropylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, bisphenol A diglycidyl ether, and the like.

  Specifically, Laromer LR8986, Laromer LR8713, Laromer EA81 (above, trade names of epoxy (meth) acrylate oligomers manufactured by BASF), NK Oligo EA-6310, NK Oligo EA-1020, NK Oligo EMA-1020, NK Oligo EA-6320, NK Oligo EA-7440, NK Oligo EA-6340 (above, trade names of epoxy (meth) acrylate oligomers manufactured by Shin-Nakamura Chemical Co., Ltd.), Ebecryl 3700, Ebecryl 3200, Ebecryl 600 (above, Daicel And a product name of an epoxy (meth) acrylate oligomer produced by UCB Co., Ltd.).

  The (meth) acrylate adhesive composition used in the present invention is characterized by containing (C) an acrylamide derivative. By including the (C) acrylamide derivative as a reactive monomer in the (meth) acrylate adhesive composition, moisture resistance, water resistance, adhesive strength, workability and transparency are improved. (C) The acrylamide derivative is not particularly limited, and various acrylamide derivatives can be used. For example, alkyl acrylamide and / or alkyl methacrylamide can be mentioned. Specific examples include acrylamide, methacrylamide, diacetone acrylamide, diacetone methacrylamide, alkylene bisacrylamide, dimethyl acrylamide, diethyl acrylamide, isopropyl acrylamide, and 4-acrylomorpholine. More preferred are dimethylacrylamide, isopropylacrylamide, diethylacrylamide and 4-acrylomorpholine. These may be used alone or in combination of two or more. The content is usually 1 to 50% by weight, preferably 5 to 30% by weight.

  The (meth) acrylate adhesive composition used in the present invention is characterized by containing (D) a silane compound. The (D) silane compound is used as an adhesion promoter for the (meth) acrylate-based adhesive composition, and has an effect of improving not only the adhesive strength but also moisture resistance, water resistance, weather resistance and transparency. The (D) silane compound used in the present invention is not particularly limited, and various silane compounds can be used. Examples include amino functional silanes, epoxy functional silanes, vinyl functional silanes, mercapto functional silanes, methacrylate functional silanes, acrylamide functional silanes, and acrylate functional silanes. You may use combining more than a kind. Among these silane compounds, amino-functional silane, epoxy-functional silane, vinyl-functional silane, and mercapto-functional silane are particularly preferable. For example, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N- aminosilanes such as β (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β (aminoethyl) -γ-aminopropylmethyldimethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, (3- (2 , 3-epoxypropoxy) propyl) trimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, and other epoxy silanes , Vinyl tris (β-methoxyethoxy Ii) Vinylsilanes such as silane, vinyltriethoxysilane, vinyltrimethoxysilane, and γ-methacryloxypropyltrimethoxysilane, hexamethyldisilazane, and γ-mercaptopropyltrimethoxysilane. Among these, (3- (2,3-epoxypropoxy) propyl) trimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycid Epoxy silanes such as xylpropyltriethoxysilane are preferred, and (3- (2,3-epoxypropoxy) propyl) trimethoxysilane is particularly preferred. These may be used alone or in combination of two or more. Its content is usually 0.1 to 20% by weight, preferably 1 to 10% by weight.

  The (meth) acrylate adhesive composition used in the present invention is characterized by containing (E) an organophosphorus compound. The (E) organophosphorus compound is used as an adhesion promoter to the metal compound of the (meth) acrylate-based adhesive composition, and not only improves adhesion to the metal compound, but also improves moisture resistance and water resistance. Have The (E) organophosphorus compound used in the present invention is not particularly limited, but phosphoric acid (meth) acrylate is particularly preferred. The phosphoric acid (meth) acrylate is not particularly limited as long as it is a (meth) acrylate having a phosphate ester skeleton, such as an ethylene oxide-modified phenoxylated phosphoric acid (meth) acrylate or ethylene oxide. Modified butoxylated phosphoric acid (meth) acrylate, ethylene oxide modified octyloxylated phosphoric acid (meth) acrylate, ethylene oxide modified phosphoric acid di (meth) acrylate, ethylene oxide modified phosphoric acid tri (meth) acrylate, and the like. More specifically, mono [2- (meth) acryloyloxyethyl] phosphate, mono [2- (meth) acryloyloxyethyl] diphenyl phosphate, mono [2- (meth) acryloyloxypropyl] phosphate, bis [2- (meta ) Acryloyloxyethyl] phosphate, bis [2- (meth) acryloyloxypropyl] phosphate, tris [2- (meth) acryloyloxyethyl] phosphate, and the like. These may be used alone or in combination of two or more. Its content is usually 0.1 to 20% by weight, preferably 1 to 10% by weight.

  The photopolymerization initiator used in the present invention is used for the purpose of polymerizing and curing the (meth) acrylate-based adhesive composition and increasing its curing rate. As the photopolymerization initiator used in the present invention, those generally known can be used. For example, 2,2-dimethoxy-1,2-diphenylethane-1-one, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 1-hydroxy-cyclohexyl phenyl ketone, oligo [2-hydroxy -2-methyl-1- [4- (1-methylvinyl) phenyl] propanone], bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide 3-methylacetophenone, 2,2-dimethoxy-2-phenylacetophenone , Xanthone, fluorenone, benzaldehyde, fluorene, anthraquinone, triphenylamine, carbazole, 3-methylacetophenone, benzophenone, 4-chlorobenzophenone, 4,4'-dimethoxybenzophenone, 4,4'-diaminobenzophenone, benzoin ethyl ether , Benzoinpropyl ether, Michler's ketone, benzyl dimethyl ketal, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1- (4-dodecylphenyl) -2-hydroxy-2-methylpropane -1-one, 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-propyl) ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one 2,4,6-trimethylbenzoylphenylphosphinate, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one Bis (2,6-dimethoxybenzoyl) -2,4,4-trimethylpen Le phosphine oxide, methyl benzoyl formate, thioxanthone, diethyl thioxanthone, 2-isopropylthioxanthone, 2-chlorothioxanthone and the like. Among these, 2,2-dimethoxy-1,2-diphenylethane-1-one, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, and 1-hydroxy-cyclohexyl phenyl ketone are more preferable. And oligo [2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propanone] and bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide. These may be used alone or in combination of two or more. Its content is usually 0.5 to 20% by weight, preferably 1 to 10% by weight.

  Many photopolymerization initiators are commercially available and can be easily obtained. Specifically, Irgacure 184, Irgacure 261, Irgacure 369, Irgacure 379, Irgacure 500, Irgacure 651, Irgacure 819, Irgacure 907, Irgacure 1700, Irgacure 1800, Irgacure 1850, Irgacure 2959, Irgacure CGI-403, 1116, Darocur 1173, Darocur 1664, Darocur, 2273 Darocur 4265 (manufactured by Ciba Specialty Chemicals).

  A thermal polymerization initiator can also be used as the polymerization initiator of the (meth) acrylate adhesive composition used in the present invention. For example, initiators selected from azo compounds such as 2,2'-azobis (isobutyronitrile), hydroperoxides such as t-butyl hydroperoxide and peroxides such as benzoyl peroxide and cyclohexanone peroxide. However, the thermal polymerization initiator is not limited thereto. These may be used alone or in combination of two or more.

  In addition to the photopolymerization initiator, if necessary, at least one photosensitizer can be added to the (meth) acrylate-based adhesive composition to control the curing time and the cured state. The photosensitizer can be selected from amine compounds, urea compounds, phosphorus compounds, nitrile compounds, benzoin compounds, carbonyl compounds, sulfur compounds, naphthalene compounds, condensed aromatic hydrocarbons, and mixtures thereof. Specific examples include amine compounds such as triethylamine, diethylaminoethyl methacrylate, N-methyldiethanolamine, 4-dimethylaminoethyl benzoate, 4-dimethylaminoisoamyl benzoate, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isobutyl ether, benzoin octyl Benzoin compounds such as ether, benzyl, diacetyl, diethoxyacetophenone, 2-hydroxy-2-methylpropiophenone, 4'-isopropyl-2-hydroxy-2-methylpropiophenone, methylanthraquinone, acetophenone, benzophenone, benzoylformic acid Methyl, benzyldimethyl ketal, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methyl Ruthio) phenyl) -2-morpholino) -propene-1,2,2-dimethoxy-2-phenylacetophenone and other carbonyl compounds, diphenyl disulfide, dithiocarbamate and other sulfur compounds, α-chloromethylnaphthalene and other naphthalene compounds, Examples thereof include condensed aromatic hydrocarbons such as anthracene and metal salts such as iron chloride. These may be used alone or in combination of two or more. Its content is usually 0.1 to 5% by weight, preferably 0.5 to 3% by weight. The sensitizer described above is preferably one that is excellent in solubility in the (meth) acrylate-based adhesive composition and does not impair ultraviolet light transmittance.

  The (meth) acrylate-based adhesive composition used in the present invention has anti-aging due to hydrolysis and oxidation of the adhesive composition itself, heat resistance and weather resistance under severe conditions exposed to sunlight and wind and rain, etc. For the purpose of improving, a light stabilizer and an antioxidant can be added.

Examples of hindered amine light stabilizers include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, Bis (1,2,2,6,6-pentamethyl-4-piperidyl) -2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-n-butylmalonate, 1-methyl- 8- (1,2,2,6,6-pentamethyl-4-piperidyl) -sebacate, 1- [2- [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionyloxy] ethyl ] -4- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] -2,2,6,6-tetramethylpiperidine, 4-benzoyloxy-2,2,6, 6-tetramethyl Piperidine, tetrakis (2,2,6,6-tetramethyl-4-piperidyl) -1,2,3,4-butane-tetracarboxylate, triethylenediamine, 8-acetyl-3-dodecyl-7,7,9 , 9-tetramethyl-1,3,8-triazaspiro [4,5] decane-2,4-dione.
Other nickel-based UV stabilizers include [2,2′-thiobis (4-t-octylphenolate)]-2-ethylhexylamine nickel (II), nickel complex-3,5-di-t-butyl-4- Hydroxybenzyl phosphate monoethylate, nickel dibutyl-dithiocarbamate and the like can also be used. In particular, the hindered amine light stabilizer is preferably a hindered amine light stabilizer containing only a tertiary amine, specifically, bis (1,2,2,6,6-pentamethyl-4-piperidyl). -Sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) -2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-n-butylmalonate, or A condensate of 1,2,2,6,6-pentamethyl-4-piperidinol / tridecyl alcohol and 1,2,3,4-butanetetracarboxylic acid is preferred.

Moreover, it is preferable to use a phenolic antioxidant, a thiol antioxidant and a phosphite antioxidant as the antioxidant. Examples of phenolic antioxidants include 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 2,2′-methylenebis (4-ethyl-6-t-). Butylphenol), tetrakis- [methylene-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate] methane, 2,6-di-t-butyl-p-cresol, 4,4 '-Thiobis (3-methyl-6-tert-butylphenol), 4,4'-butylidenebis (3-methyl-6-tert-butylphenol), 1,3,5-tris (3', 5'-di-t -Butyl-4'-hydroxybenzyl) -S-triazine-2,4,6- (1H, 3H, 5H) trione, stearyl-β- (3,5-di-t-butyl-4-hydroxyphenyl) propionate ,bird Tylene glycol bis [3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate], 3,9-bis [1,1-di-methyl-2- [β- (3-t-butyl) -4-hydroxy-5-methylphenyl) propionyloxy] ethyl] -2,4,8,10-tetraoxoxaspiro [5,5] undecane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene and the like. In particular, the phenolic antioxidant preferably has a molecular weight of 550 or more.
Examples of the thiol antioxidant include distearyl-3,3′-thiodipropionate and pentaerythritol-tetrakis- (β-lauryl-thiopropionate). Examples of the phosphite antioxidant include tris (2,4-di-t-butylphenyl) phosphite, distearyl pentaerythritol diphosphite, di (2,6-di-t-butylphenyl) pentaerythritol. Diphosphite, bis- (2,6-di-t-butyl-4-methylphenyl) -pentaerythritol diphosphite, tetrakis (2,4-di-t-butylphenyl) 4,4′-biphenylene-diphosphonite 2,2′-methylenebis (4,6-di-t-butylphenyl) octyl phosphite and the like.

  These light stabilizers and antioxidants may be used alone or in combination of two or more. In particular, a combination of a hindered amine light stabilizer and a hindered phenol antioxidant is good, and its content is usually 0.1 to 10% by weight, preferably 0.5 to 3% by weight. The light stabilizer and the antioxidant are preferably those that are excellent in solubility in the (meth) acrylate adhesive composition and do not inhibit ultraviolet light transmission.

  The (meth) acrylate-based adhesive composition used in the present invention may contain an ultraviolet absorber for the purpose of preventing deterioration due to sunlight or ultraviolet rays. Examples of the ultraviolet absorber include benzophenone, benzotriazole, phenyl salicylate, and triazine.

Examples of the benzophenone ultraviolet absorber include 2,4-dihydroxy-benzophenone, 2-hydroxy-4-methoxy-benzophenone, 2-hydroxy-4-n-octoxy-benzophenone, 2-hydroxy-4-dodecyloxy-benzophenone, 2- Hydroxy-4-octadecyloxy-benzophenone, 2,2′-dihydroxy-4-methoxy-benzophenone, 2,2′-dihydroxy-4,4′-dimethoxy-benzophenone, 2,2 ′, 4,4′-tetra And hydroxy-benzophenone.
As the benzotriazole ultraviolet absorber, 2- (2′-hydroxy-5-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) benzotriazole, 2 -(2'-hydroxy-3'-t-butyl-5'-methylphenyl) benzotriazole and the like.
Examples of the phenyl salicylate ultraviolet absorber include phenylsulcylate, 2-4-di-t-butylphenyl-3,5-di-t-butyl-4-hydroxybenzoate, and the like. Examples of hindered amine ultraviolet absorbers include bis (2,2,6,6-tetramethylpiperidin-4-yl) sebacate.
Examples of triazine ultraviolet absorbers include 2,4-diphenyl-6- (2-hydroxy-4-methoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-). Ethoxyphenyl) -1,3,5-triazine, 2,4-diphenyl- (2-hydroxy-4-propoxyphenyl) -1,3,5-triazine, 2,4-diphenyl- (2-hydroxy-4-) Butoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-butoxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2- Hydroxy-4-hexyloxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-octyloxyphenyl) -1,3,5-triazi 2,4-diphenyl-6- (2-hydroxy-4-dodecyloxyphenyl) -1,3,5-triazine, 2,4-diphenyl-6- (2-hydroxy-4-benzyloxyphenyl) -1 , 3,5-triazine and the like.

  In addition to the above, the ultraviolet absorber includes a compound having a function of converting the energy held by ultraviolet rays into vibrational energy in the molecule and releasing the vibrational energy as thermal energy or the like. Furthermore, those that exhibit an effect when used in combination with an antioxidant, a colorant, or the like, or a light stabilizer that acts as a light energy conversion agent, called a quencher, can be used in combination. However, when using the above-mentioned ultraviolet absorber, it is necessary to select one in which the light absorption wavelength of the ultraviolet absorber does not overlap with the effective wavelength of the photopolymerization initiator. In the case of using a normal ultraviolet ray inhibitor, it is effective to use a photopolymerization initiator that generates radicals with visible light.

  The usage-amount of a ultraviolet absorber is 0.1-20 weight%, Preferably it is 1-15 weight%, More preferably, it is 3-10 weight%. When the amount is more than 20% by weight, the adhesion is deteriorated.

  In the (meth) acrylate adhesive composition of the present invention, various additives other than those described above can be further blended. For example, antifoaming agents, leveling agents, antistatic agents, surfactants, storage stabilizers, thermal polymerization inhibitors, plasticizers, wettability improvers, adhesion promoters, tackifiers and the like are blended as necessary. I can do it.

  Examples of the method for preparing the (meth) acrylate-based adhesive composition of the present invention include (meth) acrylate-based polymerizable oligomers, (meth) acrylate-based polymerizable monomers, (A) (meth) acrylate monomers, and (B). Each component such as (meth) acrylate oligomer, (C) acrylamide derivative, (D) silane compound, (E) organophosphorus compound, initiator, sensitizer and other additives is charged and mixed and dissolved at room temperature to 80 ° C. And the method of filtering with a filter etc. as needed and obtaining a desired adhesive composition is mentioned. However, the adjustment method of an adhesive composition can use a well-known method, and is not limited to the said method. In consideration of applicability, the adhesive composition of the present invention preferably adjusts the compounding ratio of the components appropriately so that the viscosity at 25 ° C. is 1 to 5000 mPa.

  To apply the (meth) acrylate adhesive composition of the present invention, application by an applicator, roll knife coating method, die coater method, roll coating method, bar coating method, gravure roll coating method, reverse roll coating method, It can apply | coat using well-known methods, such as a dipping method, a spray method, a curtain flow method, and a screen coating method. The film thickness of the adhesive is preferably 2 μm or more and 200 μm or less.

  In curing the (meth) acrylate adhesive composition in the present invention, visible light, ultraviolet (UV), and electron beam (EB) can be used. When visible light or ultraviolet light is used, examples of the light source include low-pressure mercury lamp, medium-pressure mercury lamp, high-pressure mercury lamp, ultra-high-pressure mercury lamp, xenon mercury lamp, xenon lamp, gallium lamp, metal halide lamp, quartz halogen lamp, tungsten lamp, and ultraviolet light. A fluorescent lamp, a carbon arc lamp, an electrodeless microwave ultraviolet lamp, etc. are preferably used.

  As a specific method for producing a light-transmitting electromagnetic wave shield laminate in the present invention, for example, a predetermined photo-curing adhesive is applied to a polycarbonate resin sheet with a flow coater, and an electromagnetic wave shielding layer using a polycarbonate resin film as a base material. Are laminated with a laminator so as not to contain bubbles, and then irradiated with a high-pressure mercury lamp to cure the adhesive to produce a laminate. When laminating three or more sheets, a plurality of layers may be laminated by applying an adhesive to each layer and irradiating light, or after providing an adhesive layer between the layers, The laminate may be manufactured by irradiating light to cure the adhesive layer. The thickness of the laminate is preferably in the range of 0.1 to 30 mm, more preferably in the range of 0.1 to 20 mm.

  As a heating source for the light-transmitting electromagnetic wave shield laminate in the present invention, a far-infrared heater heating device equipped in the upper and lower stages such as a ceramic heater, a rod heater, and a sheath heater using far infrared rays having a radiation wavelength of 1 μm or more is used. Since far-infrared heaters are heated using the molecular vibrations of the material, compared to conventional heating methods such as electric furnaces, lot heaters, and ceramic heaters that use conventional nichrome wires or halogen lamps as heat sources. The back surface and in-plane temperature distribution are extremely small, and it is possible to heat uniformly without uneven heating.

  The far-infrared heater heating device used in the present invention is such that the upper far-infrared heater heats the entire surface, the lower far-infrared heater is surrounded by a metal plate with an opening, and the opening width of the metal plate is adjusted to adjust the light transmission type electromagnetic wave. The bent portion of the shield laminate can be selectively heated. The metal plate surrounding the far infrared heater is preferably aluminum, iron, copper, stainless steel or a casting.

As bending conditions of the light transmission type electromagnetic wave shield laminate in the present invention, the upper heater is heated entirely by a far infrared heater heating device, the lower heater selectively heats the bent portion of the laminate, and the upper and lower surface temperature difference is determined. The shield laminate heated to 140 ° C to 185 ° C controlled within 20 ° C is bent into a curved surface with a radius of curvature of 10mm or more, thereby minimizing fluctuations and residual strain of the adhesive layer, deformation, warping and peeling. It is possible to obtain a light-transmitting electromagnetic wave shield laminate excellent in bending workability that does not cause the problem. The heating width of the bent portion of the lower heater is defined by the equation (1). If the coefficient Y is smaller than 1.35, the heating width becomes insufficient, so that delamination and springback occur and the desired radius of curvature occurs. If the coefficient Y is larger than 4.15, the heating width is too wide, and the adhesive layer fluctuates and the appearance and visibility deteriorate.
Heating width = 2πR × (180 ° −X °) / 360 ° × Y (1)
Here, π is a circumference, R is a radius of curvature, X is a bending angle (inner angle), and Y is a coefficient (1.35 ≦ Y ≦ 4.15).
By heating the entire surface of the laminate with the upper heater, the residual strain caused by the selective heating of the lower heater is alleviated, the long-term durability is improved, and the peeling phenomenon is less likely to occur.
If the difference in temperature between the upper and lower surfaces of the laminate exceeds 20 ° C., warpage occurs due to the difference in thermal expansion, and peeling or fluctuation of the adhesive layer occurs, resulting in a defective product. In addition, since stress strain remains, problems such as peeling and cracking occur during long-term use. When the heating temperature is lower than 130 ° C., the polycarbonate resin base material is not sufficiently softened, so that springback occurs and a desired radius of curvature cannot be obtained. On the other hand, when the heating temperature exceeds 190 ° C., the adhesive force between the electromagnetic wave shielding layer and the polycarbonate resin base material is lowered, so that peeling occurs and the product becomes defective. Further, when the radius of curvature is less than 10 mm, the curve is too tight, so that peeling easily occurs and a defective product is generated.

  As a bending method of the light transmission type electromagnetic wave shield laminate in the present invention, the upper heater is heated on the entire surface of the laminate with a far infrared heater heating device, and the lower heater is heated to a predetermined temperature by selective heating of the bent portion. Further, a bending method using a wood mold, a mold or the like that can obtain a predetermined radius of curvature, vacuum forming, press forming, or the like is applied. However, the bending method is not limited to the method described above.

  The light-transmitting electromagnetic wave shield laminate in the present invention is resistant to aging due to hydrolysis and oxidation of the light-transmitting organic polymer material itself to be laminated, to prevent deterioration due to ultraviolet rays, and to withstand heat under severe conditions exposed to sunlight and wind and rain. In order to improve weather resistance and the like, one or more layers selected from an electromagnetic wave shielding layer, a protective layer and an adhesive layer constituting the light transmission type electromagnetic wave shielding laminate are provided with an ultraviolet absorber, a light stabilizer and an antioxidant. It is preferable to contain at least one of the agents. Although it is preferable that all the layers constituting the light transmission type electromagnetic wave shielding laminate include at least one of an ultraviolet absorber, a light stabilizer and an antioxidant, the ultraviolet absorber, the light stabilizer and the antioxidant are preferable. Since the agent is expensive, the cost is high and the economy is poor. In view of cost effectiveness, it is preferable to form a film containing at least one of an ultraviolet absorber, a light stabilizer and an antioxidant on one or both sides of the light transmission type electromagnetic wave shield laminate. .

As the coating film containing at least one of the ultraviolet absorber, light stabilizer and antioxidant, a silicone resin compound or treatment having excellent long-term durability and relatively high surface hardness However, an acrylic resin or a polyfunctional acrylic resin that is relatively simple and can form a good film is preferable. The curing method of these films depends on the properties of the resin compound used, but it is preferable to select a thermosetting or photocurable resin in consideration of productivity and simplicity. As an example of the photocurable resin, there may be mentioned a resin composition in which a photopolymerization initiator is added as a curing catalyst to a resin composition composed of one or more monofunctional or polyfunctional acrylate monomers or oligomers. Examples of the thermosetting resin include polyorganosiloxane and cross-linked acrylic resins. Such a resin composition is commercially available as a hard coat agent, and may be appropriately selected in consideration of suitability with the coating line.
In addition to the UV absorbers, light stabilizers, and antioxidants described above, these coatings include various stabilizers such as organic solvents and anti-coloring agents, leveling agents, antifoaming agents, thickeners, and charging agents as necessary. Surfactants such as an inhibitor and an antifogging agent may be added as appropriate.

  In addition, the coating film containing at least one of the ultraviolet absorber, the light stabilizer and the antioxidant is formed of a base material for improving the adhesion with the base material of the light transmission type electromagnetic wave shield laminate. A film can also be formed on an acrylic resin layer in which acrylic resins are laminated by coextrusion.

  As an example of a film made of a photocurable acrylic resin compound, 20 to 80% by weight of another compound copolymerizable with 20 to 80% by weight of 1,9-nonanediol diacrylate or tris (acryloxyethyl) isocyanurate 1 to 10% by weight of a photopolymerization initiator is added to the photopolymerizable compound consisting of

  In the present invention, brushes, rolls, dipping, flow coating, sprays, roll coaters, flow coaters, and the like can be applied as methods for applying a film to the light-transmitting electromagnetic wave shield laminate. The thickness of the coating layer cured by heat curing or photocuring is 1 to 20 μm, preferably 2 to 15 μm, and more preferably 3 to 12 μm. If the thickness of the coating layer is less than 1 μm, the effect of improving the weather resistance and the surface hardness tends to be insufficient, and conversely if it exceeds 20 μm, it is disadvantageous in cost and may cause a reduction in impact resistance.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate the embodiment and effect concretely about this invention, this invention is not limited at all by these examples. The evaluation results described in the examples and comparative examples were measured by the following test methods.

(Electromagnetic wave shielding performance test)
The electromagnetic wave shielding performance in the frequency range of 100 MHz to 1 GHz was measured using an electromagnetic wave shielding performance measuring device (manufactured by Advantest).
[Evaluation of electromagnetic shielding performance]
Those having an electromagnetic wave shielding performance of frequencies of 100 MHz and 1 GHz of 30 dB or more were evaluated as pass (◯), and those less than 30 dB were determined as unacceptable (x).

(Bending workability test)
An electromagnetic wave shielding layer (PC film, PET film) and a protective layer (PC sheet or film) were bonded with various adhesive compositions to prepare a test piece having a width of 500 mm and a length of 500 mm. Using various heaters (far-infrared heater, electric furnace heating, nichrome wire rod heater), the upper stage heater is heated on the entire surface, the lower stage heater is selectively heated to the desired heating width, and the surface temperature of the test piece is a predetermined temperature. Then, bending was performed using a wooden pattern with a predetermined radius of curvature. The curvature radius and the processing state of the test piece were visually evaluated.
[Appearance evaluation]
○: No abnormality in appearance ×: Any of peeling, foaming, whitening, warping or fluctuation occurs
[Specimen radius of curvature evaluation]
○: Error within 10% relative to the radius of curvature of the mold △: Error within 20% relative to the radius of curvature of the mold ×: Error 20% or greater relative to the radius of curvature of the mold or measurement not possible

(Adhesive preparation method)
(A) Urethane (meth) acrylate polymerizable oligomer 30.0% by weight, (B) (meth) acrylate polymerizable monomer 40.0% by weight, (C) Acrylamide derivative 20.0% by weight, (D) Silane Compound 5.0% by weight, (E) organophosphorus compound 1.0% by weight, photopolymerization initiator 4.0% by weight were charged and mixed and heated at 60 ° C. for 1 hour to obtain a desired adhesive composition. .
[Each component of the adhesive composition]
・ Urethane (meth) acrylate polymerizable oligomers Urethane (meth) acrylate oligomers containing alicyclic hydrocarbon compounds derived from dicyclohexylmethane diisocyanate ・ (Meth) acrylate polymerizable monomers Isobornyl acrylate ・ acrylamide derivatives dimethylacrylamide ・ silane compounds ( 3- (2,3-epoxypropoxy) propyl) trimethoxysilane / organophosphorus compound phosphoric acid acrylate / photopolymerization initiator Irgacure 651

(Method for producing light transmissive electromagnetic wave shield laminate using light transmissive adhesive)
Various adhesive compositions were applied to the protective layer (PC sheet or film) with a bar coater, and the electromagnetic wave shielding layer (PC film, PET film) was superposed while defoaming with a laminator. The sample was irradiated for 90 seconds using a high-pressure mercury lamp (500 W) and sufficiently cured at an irradiation dose of 1 J / cm ² . Further, when a protective layer was laminated on both sides of the electromagnetic wave shielding layer, the same method was used.
Samples for various evaluations were used as samples which were left to stand in a constant temperature and humidity chamber (23 ° C., 50% RH) for 24 hours and then cut to a width of 500 mm and a length of 500 mm.
[material]
(Electromagnetic wave shielding layer)
PC film or PET film having a surface resistance of 1 [Ω / □] or less formed by meshing using various conductive compounds.
(Conductive compound mesh)
・ AgC conductive printing mesh line 100μm, pitch 500μm, surface resistance 0.5Ω / □
・ Copper compound thin film mesh line 10μm, pitch 300μm, surface resistance 0.1Ω / □
・ Silver compound thin film mesh line 10μm, pitch 180μm, surface resistance 0.1Ω / □
(Base material)
・ PC film Polycarbonate film (100-200 μm thick) manufactured by MGC Phil Sheet
・ PET film Easy-to-adhere polyethylene terephthalate (200μm thickness) manufactured by Toyobo Co., Ltd.
(Protective layer)
・ PC sheet Polycarbonate sheet (1.5 mm to 20.0 mm thickness) manufactured by MGC Phil Sheet
・ PC film Polycarbonate film (100μm thickness) manufactured by MGC Phil Sheet

Example 1
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated over the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 40 mm (coefficient Y = 1.67) to obtain a surface temperature of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 25 mm.

Example 2
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated over the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 32 mm (coefficient Y = 1.35), and surface temperatures of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 25 mm.

Example 3
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the entire surface of the laminate is heated by the upper heater, and the lower heater is selectively heated by a heating width of 50 mm (coefficient Y = 2.10) to obtain a surface temperature of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 25 mm.

Example 4
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated on the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 100 mm (coefficient Y = 4.15) to obtain a surface temperature of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 25 mm.

Example 5
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated on the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 40 mm (coefficient Y = 1.67) to obtain a surface temperature of 130 ° C. (upper part) and 130 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold radius of curvature of 25 mm, and a wood mold bending angle of 125 °, the appearance was good and the radius of curvature of the test piece was 29 mm.

Example 6
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the laminate is heated on the entire surface by the upper heater, and the lower heater is selectively heated at a heating width of 40 mm (coefficient Y = 1.67), and the surface temperature is 150 ° C. (upper part), 150 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 26 mm.

Example 7
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated on the entire surface, and the lower layer heater is selectively heated with a heating width of 40 mm (coefficient Y = 1.67), and surface temperatures of 180 ° C. (upper part) and 180 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 25 mm.

Example 8
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far infrared heater, the upper layer heater is heated over the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 40 mm (coefficient Y = 1.67), with surface temperatures of 170 ° C. (upper part) and 150 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 26 mm.

Example 9
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated over the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 40 mm (coefficient Y = 1.67), and surface temperatures of 170 ° C. (upper) and 160 ° C. (lower) As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 25 mm.

Example 10
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper heater is heated on the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 16 mm (coefficient Y = 1.67), and surface temperatures of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the above “bending workability test” with a surface temperature difference of 0 ° C., a wood mold radius of curvature of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the radius of curvature of the test piece was 11 mm.

Example 11
Using the adhesive composition obtained from an electromagnetic wave shielding layer and a protective layer (PC film 100 μm thickness) of a copper compound thin film mesh (PC film 100 μm thickness), “light transmissive electromagnetic wave shielding lamination using a light transmissive adhesive” A sample was prepared according to “Body preparation method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated over the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 40 mm (coefficient Y = 1.67) to obtain a surface temperature of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 25 mm.

Example 12
Using the adhesive composition obtained from an electromagnetic wave shielding layer and a protective layer (PC sheet 10.0 mm thickness) of a copper compound thin film mesh (PC film 200 μm thickness), “light transmissive electromagnetic waves using a light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated over the entire surface of the laminate, and the lower layer heater is selectively heated with a heating width of 80 mm (coefficient Y = 1.67) to obtain a surface temperature of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 50 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 52 mm.

Example 13
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 20.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmitting electromagnetic wave using the light transmitting adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the laminate is heated on the entire surface by the upper heater, and the lower heater is selectively heated at a heating width of 160 mm (coefficient Y = 1.67) to obtain a surface temperature of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold radius of curvature of 100 mm, and a wood mold bending angle of 125 °, the appearance was good, and the radius of curvature of the test piece was 102 mm.

Example 14
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the upper and lower protective layers (PC sheet 1.5 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmission type using the light transmission type adhesive” A sample was prepared according to “Electromagnetic wave shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated over the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 40 mm (coefficient Y = 1.67) to obtain a surface temperature of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 26 mm.

Example 15
Using the adhesive composition obtained from an electromagnetic wave shielding layer and a protective layer (PC sheet thickness: 3.0 mm) of a copper compound thin film mesh (PET film 200 μm thickness), the above “light transmitting electromagnetic wave using a light transmitting adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated over the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 40 mm (coefficient Y = 1.67) to obtain a surface temperature of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 26 mm.

Example 16
Using the adhesive composition obtained from an electromagnetic wave shielding layer and a protective layer (PC sheet thickness: 3.0 mm) of a silver compound thin film mesh (PC film thickness: 200 μm), the “light transmission type electromagnetic wave using a light transmission type adhesive” is used. A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated over the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 40 mm (coefficient Y = 1.67) to obtain a surface temperature of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 25 mm.

Example 17
Using the adhesive composition obtained from the electromagnetic wave shielding layer of AgC conductive printing mesh (PC film thickness of 200 μm) and the protective layer (PC sheet thickness of 3.0 mm), “light transmission type using light transmission type adhesive” A sample was prepared according to “Electromagnetic wave shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated over the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 40 mm (coefficient Y = 1.67) to obtain a surface temperature of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold curvature radius of 25 mm, and a wood mold bending angle of 125 °, the appearance was good, and the curvature radius of the test piece was 25 mm.

Comparative Example 1
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. The laminated body is heated from the upper and lower sides using an electric furnace, and the surface temperature is 165 ° C. (upper part), 165 ° C. (lower part), the surface temperature difference is 0 ° C., the wood curvature radius is 25 mm, and the wood bending angle is 125 °. As a result of evaluation according to the above-mentioned “bending workability test”, the entire appearance was undulated and a large fluctuation was generated in the adhesive layer.

Comparative Example 2
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. The laminate is heated from the upper and lower sides using a nichrome wire rod heater, and the surface temperature is 165 ° C. (upper part), 165 ° C. (lower part), the surface temperature difference is 0 ° C., the wood-type curvature radius is 25 mm, and the wood-type bending angle. As a result of evaluation according to the above-mentioned “bending workability test” at 125 °, the appearance was entirely wavy and a large fluctuation and a part of the adhesive layer were whitened.

Comparative Example 3
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. The laminate is heated from the upper and lower sides using a far-infrared heater so that the surface temperature is 165 ° C. (upper part), 165 ° C. (lower part), the surface temperature difference is 0 ° C., the wood radius of curvature is 25 mm, and the wood bending angle is 125. As a result of evaluation according to the “bending workability test”, the appearance was slightly deformed and the adhesive layer was slightly fluctuated.

Comparative Example 4
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the laminate is heated on the entire surface by the upper heater, and the lower heater is selectively heated at a heating width of 30 mm (coefficient Y = 1.25) to obtain a surface temperature of 165 ° C. (upper part) and 165 ° C. (lower part). As a result of evaluation according to the above “bending workability test” with a surface temperature difference of 0 ° C., a wood mold radius of curvature of 25 mm, and a wood mold bending angle of 125 °, a part of the bent portion was peeled off.

Comparative Example 5
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the entire surface of the laminate is heated with the upper heater, and the lower heater is selectively heated with a heating width of 144 mm (coefficient Y = 6.00), and the surface temperature is 165 ° C. (upper part), 165 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold radius of curvature of 25 mm, and a wood mold bending angle of 125 °, a large fluctuation occurred in the adhesive layer, and the visibility was lowered.

Comparative Example 6
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. The laminate is selectively heated from the upper part on one side with a heating width of 40 mm (coefficient Y = 1.67) using a far infrared heater, and the surface temperature is 165 ° C. (upper part), 150 ° C. (lower part), the surface temperature difference is 10 ° C., As a result of evaluation according to the above-mentioned “bending workability test” with a wooden mold radius of curvature of 25 mm and a wooden mold bending angle of 125 °, the appearance was warped.

Comparative Example 7
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. The laminate is selectively heated from the lower part on one side with a heating width of 40 mm (coefficient Y = 1.67) using a far-infrared heater to obtain a surface temperature of 148 ° C. (upper part), 165 ° C. (lower part), a surface temperature difference of 12 ° C., As a result of evaluation according to the above-mentioned “bending workability test” with a wooden mold radius of curvature of 25 mm and a wooden mold bending angle of 125 °, the appearance was warped.

Comparative Example 8
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper heater is heated over the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 40 mm (coefficient Y = 1.67), and surface temperatures of 190 ° C. (upper part) and 190 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 0 ° C., a wood mold radius of curvature of 25 mm, and a wood mold bending angle of 125 °, the appearance was deformed and a large fluctuation was generated in the adhesive layer.

Comparative Example 9
Using the adhesive composition obtained from the electromagnetic wave shielding layer and the protective layer (PC sheet 3.0 mm thickness) of the copper compound thin film mesh (PC film 200 μm thickness), the “light transmissive electromagnetic wave using the light transmissive adhesive” A sample was prepared according to “Shield laminate manufacturing method”.
As a result of various evaluations, the electromagnetic wave shielding performance of the sample by the “electromagnetic wave shielding performance test” was good. Using a far-infrared heater, the upper layer heater is heated over the entire surface of the laminate, and the lower heater is selectively heated with a heating width of 40 mm (coefficient Y = 1.67) to obtain a surface temperature of 165 ° C. (upper part) and 140 ° C. (lower part). As a result of evaluation according to the “bending workability test” with a surface temperature difference of 25 ° C., a wood mold radius of curvature of 25 mm, and a wood mold bending angle of 125 °, the appearance was warped.

Claims (17)

In a method in which a laminate of a thickness of 0.1 mm to 30 mm formed by laminating a polycarbonate substrate on one side or both sides of an electromagnetic wave shield layer is radiated and heated from both the upper and lower sides with a far infrared heater heating device, The method for producing a light-transmitting electromagnetic wave shield laminate, wherein the lower heater is bent by selectively heating the heating width of the bending portion within a range represented by the formula (1).
Heating width = 2πR × (180 ° −X °) / 360 ° × Y (1)
Here, π is a circumference, R is a radius of curvature, X is a bending angle (inner angle), and Y is a coefficient (1.35 ≦ Y ≦ 4.15). The lower far infrared heater is surrounded by a metal plate having an opening, and the bending portion of the light transmission type electromagnetic wave shield laminate is selectively radiantly heated by adjusting the opening width of the metal plate. A method for producing a light-transmitting electromagnetic wave shield laminate according to 1. Lower far the material of the metal plate surrounding the infrared heater, aluminum, iron, copper, a manufacturing method of the light transmissive electromagnetic wave shielding laminate according to claim 2 Symbol placing a stainless steel or castings. The shield laminated body heated to 140 ° C to 185 ° C by controlling the surface temperature difference of the laminated body within 20 ° C is bent into a curved surface having a curvature radius of 10 mm or more . method for producing optically transparent electromagnetic wave shield laminate according to. The method for producing a light-transmitting electromagnetic wave shield laminate according to any one of claims 1 to 4 , wherein heating is performed using a far-infrared heater having a radiation wavelength of 1 µm or more. The conductive compound of the electromagnetic wave shielding layer contains one or more metal components selected from silver, copper, aluminum, nickel, carbon, ITO (indium oxide / tin oxide), ZnO, tin, zinc, titanium, tungsten and stainless steel The manufacturing method of the light transmission type electromagnetic wave shield laminated body in any one of Claims 1-5 using the metal compound to perform. The method for producing a light-transmitting electromagnetic wave shielding laminate according to any one of claims 1 to 6 , wherein the electromagnetic wave shielding layer has an electromagnetic wave shielding performance of 30 decibels or more. The method for producing a light-transmitting electromagnetic wave shielding laminate according to any one of claims 1 to 7 , wherein the electromagnetic wave shielding layer is one selected from a metal thin film mesh, a metal woven mesh, a conductive fiber mesh, and a conductive printing mesh. The method for producing a light-transmitting electromagnetic wave shielding laminate according to claim 8, wherein the base substrate of the metal thin film mesh and the conductive printing mesh is a polycarbonate resin, a polyethylene terephthalate resin, or a polyester resin. (A) (meth) acrylate monomer, (B) (meth) acrylate oligomer and (C) acrylamide derivative, and (D) silane compound and / or (E) organophosphorus compound, and excellent bending workability The method for producing a light-transmitting electromagnetic wave shield laminate according to any one of claims 1 to 9 , wherein the laminate is made by using an acrylate adhesive composition. (B) (meth) acrylate oligomer is at least one (meth) acrylate selected from urethane (meth) acrylate oligomer, polyester (meth) acrylate oligomer, epoxy (meth) acrylate oligomer and polyol (meth) acrylate oligomer The method for producing a light-transmitting electromagnetic wave shielding laminate according to claim 10, which is an oligomer. (C) The method for producing a light-transmitting electromagnetic wave shielding laminate according to claim 10 or 11, wherein the acrylamide derivative is alkyl acrylamide and / or alkyl methacrylamide. (D) The silane compound is at least one selected from amino functional silane, epoxy functional silane, vinyl functional silane, mercapto functional silane, methacrylate functional silane, acrylamide functional silane, and acrylate functional silane. The manufacturing method of the light transmission type electromagnetic wave shield laminated body in any one of Claims 10-12. (E) The organic phosphorus compound is a phosphoric acid acrylate compound. The method for producing a light-transmitting electromagnetic wave shield laminate according to any one of claims 10 to 13. The method for producing a light-transmitting electromagnetic wave shield laminate according to any one of claims 1 to 14, wherein a film is disposed on one side or both sides of the electromagnetic wave shield layer. The light transmissive electromagnetic wave shield laminated body manufactured by the method in any one of Claims 1-15. The light transmission type electromagnetic wave shield laminate according to claim 16, which is used for an electronic device cover, a casing shielding material, a vehicle cover, a semiconductor manufacturing apparatus cover, or a window material shielding material.